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What principles should be followed in the selection and processing of metal stamping parts

Four Principles for Material Selection of Hardware Stamping Parts

1. Choose the appropriate sizes for the sizing plate as far as possible. After shearing from the steel mill, no secondary shearing is necessary to reduce the cost of shearing. For the coiling plate, try to choose the coiling material specifications and process of uncoiling forming, so as to reduce the workload of secondary shearing and improve the work efficiency.

2. There is a deviation requirement for the thickness of the sheet. Usually within the allowable range of deviation, the sheet with lower deviation should be selected first.

3. Determining the shape and size of unfolded sheet metal for metal stamping parts is the precondition for analyzing the deformation degree of stamping parts, designing technicality and drawing up technological rules. If the shape of sheet metal is suitable, not only the phenomenon of uneven distribution of deformation along the sheet metal can be significantly improved, but also the forming limit can be improved, and the ear protrusion height can be reduced, and the trimming margin can be reduced. In addition, for some parts directly formed after blanking, if the exact shape and size of sheet metal can be given, the number of die adjustment can be reduced, thus shortening the production cycle and improving productivity.

4. When selecting materials for product design, avoid the excessive performance of products caused by the selection of high-grade materials. At the same time, on the premise of meeting the requirements of products and processes, try to select the material and material thickness of existing mass-produced models to form a material platform to facilitate subsequent purchasing and inventory management.

Five Principles for Processing Process of Hardware Stamping Parts

1. When the requirement of section quality and dimension precision of metal stamping parts is high, we can consider adding dressing process after blanking process or directly adopting precision blanking process.

2. The number of bending processes depends mainly on the complexity of its structural shape, depending on the number of bending angles, relative position and bending direction. When the bending radius of the bending part is less than the allowable value, a shaping procedure is added after the bending.

3. The number of drawing process is related to material properties, drawing height, drawing step number, drawing diameter and material thickness, which can only be determined by drawing process calculation. When the fillet radius of the drawing part is small or the dimension precision is high, a shaping procedure should be added after drawing.

4. In order to improve the stability of stamping process, it is sometimes necessary to increase the number of processes to ensure the quality of stamping parts.

5. Punching metal stamping parts with simple shape is completed by single-process die. Because the structure or strength of the die is limited, the inner and outer contour of the workpiece with complex blanking shape should be divided into several parts, and a multi-pass punching process should be adopted. If necessary, the continuous die can be chosen. For metal stamping parts with high flatness requirements, a leveling process can be added after the blanking process.

What problems should be paid attention to in different types of metal cutting processes

With the development of industry, various special engineering materials with high strength, high hardness, high temperature resistance and corrosion resistance are more and more used in metalworking industry. This puts forward higher performance indicators for the performance, spindle and structure of NC machine tools with ultra-high speed cutting and ultra-precision technology, which should be fully considered in the selection of machine tools and control systems.

1. Point control cutting technology

For point-controlled CNC machine tools, only the positioning accuracy is high and the positioning process is as fast as possible, but the movement path of the tool relative to the workpiece is not important, so this kind of machine tool should arrange the tool path according to the shortest free distance. In addition, it is necessary to determine the axial motion size of the tool, which is mainly determined by the hole depth of the machined part, but some auxiliary dimensions, such as the introduction distance of the tool and the excess amount of the tool, should also be taken into account.

2. Cutting Technology for Thread Manufacturing

When turning threads on CNC machine tools, the feed along the pitch direction should maintain a strict speed ratio relationship with the spindle rotation, so cutting should be avoided in the process of accelerating or decelerating the feed mechanism. The numerical value is related to the dynamic characteristics of the machine tool, the pitch of the thread and the accuracy of the thread.

3. Planar milling cutting technology

When milling plane parts, the side edge of end milling cutter is usually used for cutting. In order to reduce the traces of the cutter and ensure the surface quality of the parts, the cutting and cutting procedures of the cutter need to be carefully designed. When milling the outline of outer surface, the cut-in and cut-out points of the milling cutter should cut into and cut out the surface of the part tangentially along the extension line of the outline curve of the part, instead of directly cutting into the part along the normal direction, so as to avoid scratches on the machined surface and ensure the smooth outline of the part.

IV. Cutting Technology for Inner Cavity Milling

When milling the inner contour surface, cut-in and cut-out cannot be extended. At this time, the cutter can cut-in and cut-out along the normal direction of the part contour, and the cut-in and cut-out points are selected at the intersection of the two geometric elements of the part contour. When the workpiece, tool, fixture and machine tool system are in equilibrium elastic deformation state, the cutting force decreases when the feed stops, which will change the balance state of the system. The tool will leave scratches on the surface of the part at the feed stop, so it will be in the outline.

Feed pause should be avoided.

V. Cutting Technology of Surface Cutting

Surface cutting often uses “line-cutting” method with ball-nose cutter. The so-called line-cutting method refers to the path of the cutting point between the cutter and the contour of the part is line-by-line, and the distance between the lines is determined according to the requirement of the processing accuracy of the part.

These are the precautions for different types of high-speed cutting technology. With the improvement of technology, numerical control technology plays an increasingly important role in manufacturing industry.

Main Applications of Titanium Metals

Titanium is a transition metal, which has been regarded as a rare metal for some time. Since the 1940s, titanium and its compounds have been widely used in aircraft, rockets, missiles, artificial satellites, spaceships, warships, military, medical and petrochemical industries. Titanium has the advantages of high melting point, high hardness, strong plasticity, low density and corrosion resistance. Titanium looks like steel and has silver gray light translation. The tensile strength of titanium alloy is 180 kg/mm3. Titanium is characterized by low density (4.51g/cm3), high hardness, high melting point (1675 C). High purity titanium has good plasticity, but becomes brittle and hard when impurities exist. Titanium does not react with chlorine, dilute sulfuric acid, dilute hydrochloric acid and nitric acid at room temperature, but can be eroded by hydrofluoric acid, phosphoric acid and molten alkali. Titanium is easy to dissolve in H2SO4, and its most prominent performance is its strong corrosion resistance to seawater. Titanium accounts for about 0.42% of the total weight in the crust, ranking seventh in the world of metals, with more than 70 minerals containing titanium. At present, the use of titanium has developed rapidly and has been widely used in aircraft, rockets, missiles, satellites, spaceships, warships, military, light industry, chemical industry, textiles, textiles, etc. Medical and petrochemical fields.

Titanium powder is a good fuel for rocket, and its corrosion resistance is 15 times stronger than that of stainless steel, and its service life is more than 10 times longer than that of stainless steel. The application of titanium in surgical operations is also fascinating. At present, surgical osteosynthesis is made of stainless steel. There is a disadvantage of using stainless steel. It is very painful to take out the stainless steel sheet after the healing of the osteosynthesis. Otherwise, stainless steel will be harmful to human body because of rusting. If the artificial bone made of titanium is replaced, the orthopaedic technology will be completely improved. Where the head is damaged, using titanium sheet and titanium screw, in a few months, the bone will grow again in the hole and screw of the titanium sheet. New muscle fibers will be wrapped in the titanium sheet. Titanium skeleton, like real bone, is connected with the flesh and plays a supporting and reinforcing role. Therefore, titanium is praised as “biophilic metal”. Now it has been used in knee joint, shoulder joint, rib joint, skull, active heart valve, bone fixation clamp and so on.

In steelmaking industry, a small amount of titanium is a good deoxidizer, nitrogen removal and sulfur removal agent. Titanium dioxide is a valuable white pigment called titanium dioxide. Titanium dioxide is one of the whitest substances in the world, and it is non-toxic. There are hundreds of thousands of tons of titanium dioxide used as pigments every year.

Because of its high melting point, titanium dioxide is often used to make refractory glass, glaze, enamel, pottery, high-temperature experimental utensils and so on.

Titanium tetrachloride emits a lot of white smoke in wet air. Because of its characteristics, it is often used as an artificial smoke agent in military. Especially in the ocean, there is a lot of water vapor. When titanium tetrachloride is released, the smoke is like a white Great Wall, blocking the enemy’s sight.

Barium titanate crystals are widely used in ultrasonic instruments and underwater detectors. This is because when a chopper is pressed to change its shape, it generates an electric current; once it is energized, it changes its shape. When barium titanate is placed in ultrasonic wave, it will generate current when it is pressed. The intensity of ultrasonic wave can be measured by the current generated by barium titanate. On the contrary, ultrasonic wave can be generated by high frequency current passing through it.

In gold decorative arts and crafts and daily necessities, they are not durable because of their low hardness, easy to puncture and wear. When a layer of titanium nitride is coated on the surface of these substances, the appearance is almost the same as that of gold, but more wear-resistant than gold and cemented carbide, which is known as “never wear”.

Organic titanium polymer can be used as surfactant, dispersant, water-resistant agent or rust-proof agent.

Titanium is one of the four series of hydrogen storage metals currently used by human beings, and it is also a cheaper one. But at present, human beings have not found a better “hydrogen storage metal”. Once this problem is solved, people can use hydrogen as fuel.

“Titanium aircraft” can reduce the body weight by 5 tons, carrying more than 100 passengers. In the new jet engine, titanium alloy has accounted for 18-25% of the total engine weight; in the latest supersonic aircraft, the use of titanium accounts for almost 95% of the total body structure weight, so it is difficult to develop the current supersonic aircraft without titanium alloy.

The submarine made of titanium is not only more durable than the steel submarine, but also can submerge deeper. The titanium submarine can submerge below 4500 meters, which is an insurmountable limit for the steel submarine. Warships and ships made of titanium do not need to be painted, nor do they rust after years of sailing in the sea. Because titanium is not a ferromagnetic material and will not be found by magnetic mines, this is particularly important in the military. Without the heat-resistant steel made of titanium, the life of rifles and machine guns currently used in conventional weapons can only be the initial 4.5 seconds.

With the strong absorption of titanium and zirconium to air, air can be removed and vacuum can be created. Vacuum pumps made of titanium-zirconium alloys can pump air to only one-billionth of what is left.

Titanium-niobium alloy is an ideal superconducting material. Using the principle of optical interference and ion titanium nitride treatment, Tsinghua University has produced a clear and hierarchical landscape ink painting.

Among the two most common stainless steels currently in use, chromium-nickel-titanium 18-8-1 (containing 18% chromium)

Common problems and solutions in the use of stainless steel screw

Stainless steel screw is used in our daily life very large, but the common problems and solutions in the daily use process are not well known, such as the common problems of loosening, rust, fracture, etc. Once these problems occur, small screw replacement will cause destructive damage to equipment components, so how to avoid these problems, the following letter is pure solid. For you to list these common problems and their prevention methods.

1. Anti-loosening of stainless steel screw:

Simply speaking, it is to make stainless steel screw used in product materials, so that stainless steel screw will not slightly fall off. Screws need to be more tightly connected to the product material. For the anti-loosening solution of stainless steel screw, there are two solutions as follows:

1. The anti-elasticity of special materials, such as engineering resin materials, has better anti-elasticity. Attach it to the thread of stainless steel screw. Make it mechanical friction with nuts or material products. It produces vibration and absolute resistance. Solve the problem of screw loosening completely.

2. Coat a layer of glue on the thread of stainless steel screw teeth, so-called dispensing. This kind of glue is called drop resistant glue. This kind of adhesive has good properties such as high stickiness, non-toxicity and so on. This kind of glue is coated on stainless steel screw, after drying, the adhesion force is super strong. It can make stainless steel screw thread combine with nut thread or produce super-factor fastening effect after product thread hole joint. Play a super anti-loosening role.

2. Rust of stainless steel screw

1. Attachments of dust or heterogeneous metal particles, in moist air, attachments and condensed water of stainless steel screw, connect them into a micro-battery, which triggers electrochemical reaction and destroys the protective film, which is called electrochemical corrosion.

2. The surface of stainless steel screw is adhered with organic juice (such as melon, vegetable, noodle soup, phlegm, etc.). Under the condition of water and oxygen, organic acid is formed, and for a long time, organic acid corrodes the metal surface.

3. The adherence of stainless steel screw surface contains acid, alkali and salt substances (such as alkali water and lime water splashing on decoration wall), which causes local corrosion.

4. In polluted air (such as atmosphere containing large amounts of sulfide, carbon dioxide and nitric oxide), sulfuric acid, nitric acid and acetic acid are formed in the presence of condensate, which leads to chemical corrosion.

The above conditions can cause the destruction of the protective film on the surface of stainless steel screw and lead to corrosion. Therefore, in order to ensure that the surface of stainless steel screw is permanently bright and not rusted. We have to clean its surface. Passivation and other treatment.

Xinchun Fastener reminds us that when using stainless steel screw in our daily work and life, we must pay attention to the above four points to prevent stainless steel screw from rusting.

3. Fracture of stainless steel screw:

But generally speaking, stainless steel screw is seldom broken. Because the stainless steel screw wire itself is harder. But under certain circumstances, stainless steel screw will break. So what are the main reasons for the breakage of stainless steel screw?

The reasons for the breakage of stainless steel screw are as follows:

1. The quality of raw materials used for stainless steel screw is poor. There are many impurities, impurities, resulting in the hardness of stainless steel screw is not enough.

2. Production process of stainless steel screw. For example, the eccentric stainless steel screw, as well as the production of down-punching operation when Q value is too deep and R bit design is too small.

3. When customers use stainless steel screw, they exert too much force. It is generally recommended to do torsion test on stainless steel screw to see how much the minimum breaking force is, and then adjust the corresponding torsion.

The above three reasons are the main reasons for the breakage of stainless steel screw. The problem of screw breaking is various. If none of the above is the cause of breaking, it should be checked step by step to find out the final cause.

Importance of Forging and Stamping

Forging, stamping and sheet metal manufacturing industry is a very important basic industry in manufacturing industry, but it is a labor-intensive industry dominated by small and medium-sized enterprises. According to the current reality, small and medium-sized forging, stamping and sheet metal manufacturing enterprises can hardly enjoy any policy dividends. In addition, forging, stamping and sheet metal manufacturing industries need to continue to carry out technological process development. Support is the current implementation of strong foundation projects, because it belongs to product or project support policy, so the forging, stamping and sheet metal manufacturing industry projects are not paid enough attention to and intentionally strengthened.

Even so, driven by the investment boom in the past few years, some forging, stamping and sheet metal manufacturing enterprises have begun to expand the industrial chain, blindly entering the downstream user industry, not only forging enterprises, including machine processing enterprises and main engine factories, but also the phenomenon of overinvestment is everywhere. Private enterprises are particularly prominent, and investment penetrates into each other. Everyone has made further progress, past high. The phenomenon of excess capacity is aggravated by the high input of growth, but the newly-entered enterprises can not do it because of the lack of accumulation of products with high technical requirements, while the products with low added value fall into vicious competition and the profits become thinner and thinner. This makes the competition of enterprises mainly embodied in the quantity expansion of resource input and output and the price competition, rather than the centralized independent innovation ability. High quality and improvement of product quality.

High-speed and high-precision are the development trends of precision high-speed pressure. In order to achieve high-speed and high-precision, foreign precision high-speed pressure manufacturers have done a lot of research in the fields of dead-point control of driving mechanism, and formed many patents.

“Flower sedan chairs are lifted by all”, which is a very vivid metaphor. In terms of further expanding and consolidating the source of tourists, Yangli has made great efforts.

Sheet Metal Stamping Technology and Design Knowledge of Precision Progressive Die

1. What is the function of drawing sill (drawing rib) in panel die?

The function of drawing sill (drawing rib) is as follows:

(1) Increase the feed resistance, make the surface of the drawing part bear enough tension stress, improve the stiffness of the drawing part and reduce the defects such as concave surface, distortion, relaxation and ripple caused by springback.

(2) To adjust the flow of materials so that the flow resistance of each part in the drawing process is uniform, or the amount of material flowing into the die is suitable for the needs of all parts of the workpiece, so as to prevent the phenomenon of “more wrinkles, less cracks”;

(3) Expanding the adjustment range of blank holder force. On the double-action press, adjusting the four angles of the outer slider can only roughly adjust the blank holder force, and it can not completely control the feed amount everywhere just in line with the needs of the workpiece, so it also needs to rely on blank holder and drawing rib to assist in controlling the pressure everywhere.

(5) When the drawing rib is used, it is possible to reduce the requirement for the roughness of blank holder surface, which reduces the manufacturing difficulty of drawing die for large panels, and at the same time. Because of the existence of drawing ribs, the gap between upper and lower blank holder surfaces is increased, the wear of blank holder surface is reduced, and the service life of die is increased.

(5) Correct the defect of material irregularity and eliminate the possibility of slip. Because when the material fluctuates through the drawing rib and then flows into the die, it is equivalent to the role of roll leveling.

2. What is the role of process notches in large panels?

When some deep local protrusions or bulges need to be punched out on the middle part of the panel, the local breakage of the workpiece is often caused by the inability to get material supplement from the outside of the blank in one drawing. At this time, it can be considered to punch out the process notch or hole at the appropriate location of the local protrusion deformation zone, so that the easily fractured area can be supplemented by material from the inside of the deformation zone.

3. How to cut the technological incision?

There are two kinds of stamping methods for artistic notches:

(1) When blanking, this method is used in the case of shallow local forming depth.

_Cutting out is a common method in deep drawing. It can make full use of the plasticity of material, i.e. the radial extension of material at the beginning of deep drawing, and then cut out the technological incision. By means of tangential extension of the material, a larger forming depth can be obtained. In the process of deep drawing, the tearing process is often used, which does not completely separate the material. The waste of the incision can be removed in the later trimming process. Otherwise, it will be difficult to remove the waste from the die.

4. What are the layout principles of process incisions?

(1) The incision should be adapted to the shape and contour of the local protuberance in order to make the material flow reasonably.

(2) There should be enough lapping edges between the incisions to tighten the punch material, to ensure clear forming and avoid corrugation, so as to ensure good flanging edge quality after trimming.

(3) The cut-off part of the incision (i.e. the opening) should be adjacent to the edge of the protrusion or the area prone to rupture.

(5) The number of incisions should ensure that the material deformation tends to be uniform in all parts of the protrusion, otherwise it may not necessarily prevent the appearance of lines. As shown in the following figure, the original design only had two process notches left and right, resulting in cracks in the middle, and then added the middle notch (dotted line shown) to completely eliminate the phenomenon of rupture.
5. What precise progressive dies must be used in stamping production?

In large-scale stamping production, multi-position precision progressive die must be used for small and medium-sized stamping parts with thinner materials and higher precision. For larger stamping parts, it is suitable for stamping of multi-station transfer die.

6. What are the requirements for vulnerable parts in precision dies?

Precision die has complex structure, high manufacturing technology requirements and relatively high cost. In order to ensure a higher life of the whole die, it is particularly required that the die parts be replaced quickly, conveniently and reliably after being damaged or worn out. Therefore, the important parts of the die are required to be interchangeable. The die parts with interchangeable properties can be called interchangeable punching die.

7. What is the significance of layout design of precision progressive die?

Answer: Reasonable layout design can make the processing of the die coordinated, can greatly improve the utilization rate of materials, manufacturing accuracy, productivity and die life, but also reduce the manufacturing difficulty of the die. Therefore, layout design is the most critical comprehensive technical problem in the design of precision progressive dies. In order to make layout more reasonable, it is necessary to analyze and judge the stamping direction, the number of deformation, the corresponding degree of deformation, the possibility of die structure and the processing technicality.

8. What is a carrier?

When the progressive die is working, the object that carries the blank to various workstations for blanking and forming is called carrier. The part between the carrier and the blank is called lap, and the part between the blank and the blank is called lap. When working, in dynamic processing, the carrier is required to keep stable and accurate feeding position all the time, so the carrier is required to have certain strength.

9. What is the requirement of the precise progressive die for the die base?

M precision progressive die requires high strength, rigidity and precision. Therefore, structural steel is usually used as the die base. Its thickness is required to be thicker than the standard die base. The thickness of the upper die base is 5-10 mm, and the thickness of the lower die base is about 10-15 mm.

10. What types of die structure are there?

The common types of die structure are integral. Block type and block type three blocks, in ordinary punching

What are the steps of automobile gear manufacturing process

Gears are the main basic components in the automotive industry. The quality of gears directly affects the noise, stability and service life of automobiles. Gear manufacturing machine tool is a complex machine tool system and a key equipment in automobile industry. According to different gear types, gear cutting machine tools can be divided into two categories: cylindrical gear machine tools and bevel gear machine tools.

Forging billet

Hot die forging is still a widely used blank forging process for automotive gear parts. This technology is especially suitable for the complex step shaft billet making. It not only has high precision, but also has low afterorder margin and high efficiency.

II. DETERMINATION OF EQUIPMENT

With the rapid development of machine tool equipment and tool material technology, CNC cutting lathe and grinding technology are widely used in automobile gears.

3. clamping method

Only when the clamping datum is consistent with the measuring datum should it be a reasonable and scientific method, which usually varies with the different structural shapes of gears. Usually three jaws are used to clamp the end face of the inner hole groove. Axle gears are mainly clamped by the top, while conical plugging is used when the aperture is large.

IV. Design of Fixtures

Fixture needs the consistency of process datum and measurement datum to realize the end clamping of inner groove, which is convenient and accurate. It is necessary to understand the structure of machine tools, determine the size of the connection with auxiliary guidance, this process is very good to ensure the consistency of workpiece size.

V. Selection of Oil Products

The factors affecting the cutting accuracy of super automobile gears are roughly cutting datum, cutting tool accuracy, rationality of cutting tool, quality of workpiece raw materials, performance of cutting oil, etc. Gear cutting oil is usually selected according to the material of gear workpiece, such as inactive vulcanized gear cutting oil should be selected to avoid rust when cutting carbon steel gears.

6. Blank Cutting

Gear blank cutting plays an important role in the whole gear manufacturing process, because the benchmark used in gear surface cutting and testing must be completed at this stage. Whether to improve efficiency or to ensure the quality of gears, we must attach importance to the cutting of gear blanks.

7. Tooth End Cutting

There are chamfer, chamfer, chamfer and deburring methods in gear end processing, which must be done before gear quenching. The chamfered and chamfered gears are easy to enter the meshing state to reduce the impact when shifting. The chamfered edges can remove the tip edges and burrs of the teeth, etc.

VIII. Carburizing Treatment

Carburizing and quenching are required for automobile gears to ensure good mechanical properties and stable and reliable heat treatment process.

Grinding Technology

The main purpose is to improve the dimensional accuracy and reduce the tolerance of shape and position by finishing the inner hole, the end face and the outer diameter of the shaft of the gear after heat treatment.

These are the process steps of gear manufacturing process. Reasonable selection of machine tools and equipment can effectively reduce investment and improve efficiency.

Several Notices for Bending Process of Hardware

Processing technology and precautions of folding machine:

1) Processing range of bending:

The distance from the bending line to the edge is more than half that of the V-groove. For 1.0 mm material, the minimum distance is 2 mm when the lower die of 4V is used.

Note: If the inner dimension of the folding material is smaller than the minimum one in the table above, the folding machine can not be processed in the normal way. At this time, the folding edge can be lengthened to the minimum one, and then trimmed after bending, or die processing can be considered.

2) When bending the bending machine, due to the size of the hole edge to the bending line is too small, appropriate processing must be done at this time: (1) LASER is secant on the corresponding bending line.

(2) NCT line pressing on the corresponding bending line (this method is preferred). (3) Enlarging the hole to the bending line (this method must be confirmed with the customer).

Note: When the distance between the holes near the bending line and the bending line is less than the minimum distance listed in the table, deformation will occur after bending.

3) Reverse flattening:

When the convex hull is opposite to the square direction of reverse bending, and the distance from the bending line is less than 2.5t, the flattening will cause the convex hull to deform. Process treatment: before flattening, a fixture is put under the workpiece, the thickness of the fixture is slightly greater than or equal to the height of the convex hull, and then the flattening die is used to flatten it.

4) When the hole is too close to the bending line (<3T+R), it must be pressed or secant at the bending line to avoid deformation of the hole when bending.

5) Plating Workpiece
Bending of electroplated workpiece must pay attention to indentation and coating shedding (special description should be given on engineering drawings).
6) segment difference
According to the forming angle, it can be divided into straight-edge fault and oblique-edge fault. The processing method depends on the height of the fault.
Straight edge breakage: When the breakage height h is less than 3.5 times the material thickness, the breakage die or easy die forming is adopted, and when the material thickness is greater than 3.5 times, the normal one positive one negative two folds are used to complete the breakage

Inclined edge breakage: When the length of inclined edge is less than 3.5 times the thickness of material, it is formed by breakage die or easy die, and when the thickness is greater than 3.5 times, it is completed by normal one positive one negative two folds.

7) riveting electrostatic Guide

When the distance between the edge of the electrostatic guide rail and the bending line is more than 1+V/2mm (V is the width of the lower die V slot of the folding bed), the electrostatic guide rail can be riveted first and then bended. When the distance between the edge of the electrostatic guide rail and the bending line is less than 1+V/2mm, the electrostatic guide rail must be riveted first and riveted again. As shown in the figure below, the material of 1.2mm can be riveted by 5V. Note: The width of electrostatic guideway is 7.12mm, model: 700-02776-018) thin material, with strong elasticity.

Or the bending angle is very important. Usually we can consider pressing line on the bending line, or opening process holes on the bending line or pressing reinforcing bars on the bending line. In order to avoid springback after bending, resulting in dimensional errors. If easy-to-die processing is designed, springback must be taken into account.

9) pressing convex hull

When the convex hull is easy to press, if the height of the convex hull is very strict, the back pressure method can be considered to ensure its accuracy.

10) Die specifications for bending press triangle strengthening triangle strengthening:

There are two kinds of triangular reinforcement forming:

1. Share with bending tool, that is, bending and triangular reinforcement are processed simultaneously.

2. Workpiece bending and then pressing triangle reinforcement.

Note: The number of triangular reinforcement is related to the number of moulds. As can be seen from the table above, at present the same specification can be formed in four places at most. If it exceeds this number, it must be solved through consultation with the relevant personnel.

What are the specific technological requirements for ultra-high speed metal cutting

I. Requirements for Machine Tools in High Speed Cutting

(1) The power of high-speed cutting machine tools must be large enough to meet the demand for the change of power and speed of machine tools during cutting.

(2) High-speed cutting machine tools must be equipped with compact high-speed spindle and high-speed feed screw.

(3) High-speed cutting machine tools must be equipped with solid bench, rigid gantry frame and the matrix material should have a greater effect on the structural vibration attenuation of machine tools. This structure can effectively eliminate the vibration in processing and improve the stability of machine tools.

(4) The linear motor driven directly can improve the quality and greatly simplify the structure, and it is easy to achieve high linear speed and provide constant speed, so that the workpiece can obtain the best surface quality and longer tool life.

2. Requirements for NC in High Speed Cutting

For the CNC system of high-speed cutting machine tools, there must be high-speed and high-precision interpolation system, fast response CNC system and high-precision system; there must be pre-reading, automatic angle deceleration, interpolation, which can be applied to general computer platform and other functions.

3. Requirements for Spindle in High Speed Cutting

Because of the high speed of the spindle, high requirements are put forward for the structure and bearing of the spindle in order to reduce the axial and radial circular runout of the spindle. The integral manufacturing method can greatly reduce the error of the spindle in high speed rotation. By choosing high precision bearings, the dynamic balance of the spindle can be effectively improved and the error of the workpiece can be reduced.

4. Requirements for Tools in High Speed Cutting

Tool selection is very important in high-speed cutting. Tool selection is mainly considered from two aspects: one is the dynamic balance state of the tool under high-speed rotating state, and the other is how to ensure the life of the tool.

(1) Cutting tools with dynamic balancing devices are used. Mechanical sliders or fluid dynamic balancing designs are installed in the tool sleeve.

(2) The holistic cutter is adopted, and the cutter sleeve and the cutter body are integrated to ensure that the clearance between the cutter body and the cutter sleeve is minimum in the installation process. From the overall performance, the overall tool is the most ideal in this respect.

(3) The General requirements of high-speed cutting tools are balance, advanced materials, high manufacturing accuracy, safety, easy chip removal and multi-purpose.

V. Requirements of High Speed Cutting for Parameters

When the spindle speed is fixed, first of all, attention should be paid to the control of cutting depth, including the axial cutting depth of the tool and the radial cutting depth of the tool. The control of cutting depth plays a key role in producing a qualified part and prolonging the service life of the tool. Therefore, the stable cutting depth and the width of the comparative small fluctuation range should be maintained. In general, cutting parameters should adopt higher cutting speed, less margin of finishing time, more dense tool path and smaller cutting depth in order to obtain high accuracy and reduce the roughness of the part surface.

6. Requirements for Programming in High Speed Cutting

In order to avoid the influence of machine inertia in high-speed cutting process, it is theoretically possible not to change the direction of feed in the cutting process, but in fact it is impossible to achieve this. Changing the direction of feed is unavoidable and often used, which gives programming a difficult problem. Therefore, it is necessary to select a suitable tool-walking method to solve this problem in order to generate safe, effective and accurate tool paths and ideal surface accuracy. Generally, when the knife is empty, change direction as far as possible, and reduce the feed speed before changing the feed direction. In addition, it is also very important to keep the cutting conditions as constant as possible. Because different tool loads can cause tool deviation, which will reduce the accuracy of workpiece, surface accuracy and tool life.

SELECTION OF OIL PRODUCTS IN HIGH SPEED CUTTING

The factors affecting the accuracy of ultra-high speed cutting are roughly the cutting datum, the accuracy of cutting tools, the rationality of cutting tool, the quality of workpiece raw materials, the performance of cutting oil and so on. How to select cutting oil is also an important subject in metal cutting technology.

(1) Silicon steel cutting oil

Silicon steel is a relatively easy-to-cut material. Generally, in order to make the workpiece easy to clean, low-viscosity cutting oil will be selected on the premise of preventing the occurrence of cutting burrs.

(2) Carbon steel cutting oil

When choosing cutting oil for carbon steel, the better viscosity should be determined first according to the difficulty and the method of oil feeding and degreasing conditions. Secondly, the problem of chlorine-type cutting oil rusting can be avoided by using Yida Borun sulfur-type cutting oil.

(3) Stainless steel cutting oil

Stainless steel is easy to produce hardening material, which requires cutting oil with high film strength and good sintering resistance. Cutting oil containing sulfur and chlorine compound additives is generally used to ensure extreme pressure performance and avoid burrs and tool wear.

These are the technical schemes to realize high-speed cutting technology. With the continuous development of tool technology, machine tool technology, programming technology, numerical control technology and other related technologies, high-speed cutting technology will become more and more perfect and play an increasingly important role in modern manufacturing industry.

Types and Selection of Cylinders

hat are the types of cylinders? The following is a short edition of Yushi to share with you:

(1) Actions can be divided into single-action and double-action. As shown in the structure diagram, the former can be divided into spring pressing and back pressing. It is generally used in situations with short travel, low demand for output force and motion speed (low price, low energy consumption), and double-action cylinders are more widely used. (Note: Do not equate single-acting and double-acting cylinders with or without magnetic rings).

A kind of

(2) Functionally, there are many types, such as standard cylinder, composite cylinder, special cylinder, swing cylinder, air claw, etc. Among them, freely mounted cylinder, thin cylinder, pen cylinder, double-rod cylinder, slide-table cylinder, rodless cylinder, rotary cylinder and claw cylinder are commonly used.