2019 – Page 28 – CNC Machining & Turning, Milling, Metal parts

What are the main points to improve the accuracy of cutting technology

The emergence of CNC machine tools is a great progress in industry, it can better solve complex, precision, small batch, changeable parts processing problems, is a flexible, efficient automated machine tools. When machining with NC machine tools, the process analysis must be carried out first. According to the material, contour shape and machining accuracy of the workpiece to be processed, the appropriate machine tool is selected, the machining scheme is worked out, the machining sequence of the parts is determined, the cutting tools, fixtures and cutting oil used in each process are determined. The following points are briefly introduced to improve the cutting process.

Reasonable selection of cutting parameters

For high efficiency metal cutting, the material to be machined, cutting tools, cutting conditions are the three major elements. These determine the processing time, tool life and processing quality, economic and effective processing method is bound to be a reasonable choice of cutting conditions.

Three factors of cutting conditions: cutting speed, feed rate and cutting depth directly cause damage to the cutter. The choice of tool life is related to tool wear, dimension change, surface quality, cutting noise and machining heat.

The relationship between the feed condition and the wear behind the tool is produced within a very small range. But the feed rate is high, the cutting temperature rises, and the rear wear is large. It has less influence on cutting tools than cutting speed. The influence of cutting depth on cutting tool is not as great as cutting speed and feed, but the hardening layer produced by cutting material will also affect the tool life in micro-cutting.

Two. Choose tools reasonably.

(1) Choose cutting tools with high strength and good durability when rough turning, so as to meet the requirements of large back feed and large feed when rough turning.

(2) to select precise and durable tools to ensure the machining accuracy.

(3) in order to reduce the tool changing time and facilitate the tool setting, the clamp and blade should be used as far as possible.

Three. Choose the fixture properly.

(1) try to use universal fixture to clamp workpiece and avoid using special fixture.

(2) parts positioning datum coincides to reduce positioning error.

Four. Determine the processing route.

Machining path refers to the movement path and direction of the tool relative to the parts in the process of NC machine tool processing.

(1) the machining accuracy and surface roughness should be ensured.

(2) we should shorten the processing route and reduce the idle travel time of cutting tools.

Five. The relationship between processing route and machining allowance.

Generally, excess allowance on the blank, especially the allowance containing forged and cast hard skin, should be arranged on the ordinary lathe for processing. If CNC lathe is necessary, attention should be paid to the flexible arrangement of the program.

Six. The use of special cutting oil.

Generally, in order to clean the finished product easily, the better viscosity should be determined according to the difficulty of processing and degreasing conditions. Some workpiece raw materials will react with chlorine additives, so we should pay attention to the problem of white rust when choosing cutting oil. The cutting oil containing sulfur and chlorine compound additives can ensure the extreme pressure processing performance, and avoid burrs and cracks on workpiece.

Above is the common cutting process need to pay attention to matters, through continuous improvement process, the choice of reasonable cutting tools and cutting oil can effectively improve the cutting accuracy. Yida Borun Petrochemical Company is the largest high-end metalworking additive base in China. The self-developed cutting oil has excellent extreme pressure and anti-wear properties, can effectively improve the accuracy and efficiency of the workpiece, and is not harmful to human body, workpiece, equipment and environment. It is the designated partner of many domestic metal processing enterprises. In practice, it should Get the praise from customers both at home and abroad.

How to choose a good tensile testing machine

First of all, from its direction, a variety of settings and choices, the purpose is to complete a mechanical properties test. Tension tester is widely used in many factories, universities, scientific research laboratories and so on. At the same time, it belongs to the general industry testing instruments.

Secondly, to understand the classification of the tensile testing machine on the website, Foshan Anzhen has a metal microcomputer, single arm, horizontal tension, spring tension and compression testing machine, its scope of application can not be one-sided comprehensive, metal microcomputer testing machine for rubber, plastics, textiles, waterproof materials, wires and cables, wire, wire, wire, metal wire, gold It is a tensile test for rods, metal plates and other materials. Additional attachments can also be used for compression and bending tests.

Single arm tensile testing machine has a very broad application prospect in the mechanical properties test of metal, non-metal, wood and products. Horizontal tension tester is suitable for the performance testing of push-pull tester, and spring tension-compression tester is also the testing equipment for mechanical properties.

Considering the tension range of the material to be tested is also a factor that manufacturers need to consider, for the general soft packaging manufacturers, most of the use of a single arm can be. Corresponding to the single-arm structure is the portal structure, it is suitable for a relatively large pull, such as a ton or more, soft packaging manufacturers basically do not need.

The tensile property of plastics and rubber is one of the important and basic properties of their mechanical properties, which largely determines the use of this kind of plastics and rubber occasions. Tensile properties can be tested by tensile tests. In the future, material performance testing will be the place that manufacturers should pay attention to, the better the quality, the more customers will return!

The use of butt welder

1. According to the working principle of butt welding machine, butt welding process can be divided into resistance butt welding and flash butt welding.

Resistance butt welding is to heat the end joint of steel bar to plastic state, then cut off the power supply, and then heat up to plastic connection. This welding process is easy to produce oxidation and slag inclusion in the joint, and requires the steel bar section to be smooth and smooth, while welding consumes a lot of electricity, requires a large welding machine power, so it is seldom used.

Flash butt welding refers to the process of welding, from the end of the steel bar joints where melted metal particles, showing sparks (flash). It is widely used in butt welding, especially for low carbon steel and low alloy steel.

2. Attention should be paid to the following items when using the welder.

Adjust the distance between the two jaws. The nipple spacing should be the difference between the total elongation and the extrusion of the two weldments when the adjusting screw is rotated so that the control rod is at the left limit. When the control rod is in the right limit, the distance between the nippers should be the total elongation length of the two weldments plus 2-3 mm, the original position before welding.

Adjust the short-circuit limit switch, so that it can automatically cut off the power supply at the end of welding (reach the predetermined extrusion).

Adjust the jaws according to the shape of the welds and place the two jaws at the same level, then clamp the weldments.

To prevent transient overheating of the weldments, the series of adjustment should be added step by step and proper secondary voltage should be selected. For flash butt welding, a higher secondary voltage should be used.

To avoid overheating during welding, the cooling water valve must be opened before water can be welded. For convenience of inspection, a funnel is arranged in front of the left side of the welder to observe the flow of water directly, so as to check whether there is cooling water flowing through the welder.

3. Operation points of reinforcing bar butt welding machine

Operators of butt welding machines must undergo professional training, be familiar with butt welding machine structure, performance, operating procedures, and master the selection of process parameters, quality inspection specifications and other knowledge.

Before operation, it is necessary to check whether the welding machine is sensitive and reliable, whether the electrical system is safe, whether there is leakage in the cooling water pump system, whether the lubrication parts are well oiled, etc.

It is strictly forbidden to weld the steel bar that exceeds the specified diameter. The main reinforcement must be welded before cold welding. In order to ensure welding quality, cleaning, rust removal and correction should be carried out within the range of 150 mm of the sensing end.

Operators must wear colored protective glasses and hats to prevent the arc light from irritating the eyes and burning the skin with molten metal.

The butt welding machine should be parked in a clean, dry and ventilated place. The butt welding machine used on the spot should be equipped with a rain-proof, moisture-proof, sun-proof shelter, and equipped with fire-fighting equipment. Flammable materials should not be piled up within the welding range.

The butt welding machine should be equipped with a special wiring switch and installed in the switch box. The capacity of the fuse should be 1.5 times that of the machine. The welder housing must be grounded properly.

After welding, the joint should be properly upsetting without cracks and obvious burns. The crankshaft of the joint axis is not greater than 6 degrees, and the offset is not greater than 1/10 of the diameter of the steel bar, and shall not exceed 2mm.

After the operation to clean up the site, extinguish fire seeds, winter also compressed air blowing cooling pipe water, cut off the power supply.

Introduction of forging press

A forging machine is a device for metal and mechanical cold processing. It only changes the outer shape of the metal. Forging machine tools include rollers, shears, punches, presses, hydraulic presses, hydraulic presses, benders and so on.

There are many kinds of accessories for machine tools, including flexible organ shield (leather tiger), knife blade, steel plate stainless steel guide shield, retractable screw shield, rolling shield, protective skirt curtain, dust-proof folding fabric, steel tow chain, engineering plastic tow chain, machine tool lamp, machine tool pad iron, JR-2 rectangular metal hose, DGT Conduit protective cover, adjustable plastic cooling pipe, vacuum pipe, ventilation pipe, explosion-proof pipe, stroke groove plate, impact block, chip removal machine, deflectometer, platform granite plate cast iron plate and various operating parts.

80 tips for machining internal threads, tools must be seen

Improper selection of screw tap

1. use the precision series to fit the screws.
2. increase the length of ingestion.
3. reduce the rake angle.
4. choose the tap with the same heart and wide back.

5. adjusting the cutting angle of the cutting cone length.

Chip clogging
1., we should use the forward wire attack or the spiral wire attack.
2. reduce the number of screws and expand the trench volume.
3. use fine thread.
4. increase the diameter of the hole as much as possible.
5. blind hole as far as possible to deepen the bottom hole.
6. shortening tapping length
7. use his cutting oils and oil injection methods.
8. select internal cooling taps.

Inappropriate use conditions
1. adjust the cutting speed.
2. prevent screw attack from lower hole eccentric or inclined.
3. screw tap or fixed work with floating type.
4. feed speed should be appropriate to prevent Asan deformation.
5. adopt forced feed mode (pitch feed mode).
6. properly choose the processing ability of tapping machine.
7. prevent spindle vibration
8 use flexible tapping cone.

bond
1. use screws with surface oxidation film treatment.
2. use cutting oil with high melting resistance.
3. reduce cutting speed
4. change cutting angles to make cutting materials suitable.
5. select internal cooling taps.
6. shortening thread length

Reduction of inner diameter of internal thread

Improper selection of screw tap

1. use more screws to attack.
A. has less expansion for cutting materials such as copper alloy, aluminum alloy and cast iron.
B. is cut easily, such as tubes or thin plates.
2., eat into the clearance angle should be appropriate.
3. increase cutting angle
4. increase the front corner.
5. increase the number of slots.

Internal thread injuries
When rotary is launched, especially the wire attack will leave the inner thread, the speed should be appropriate so as not to cause any damage.
Chip residue in internal thread
1. increase the sharpness of the tap and reduce the residue of its whiskers.
2. check the internal threads only after completely removing the remaining chips.

Cracking or biting marks
The intake length is not enough.
1. increase the length of the front part.
2. cutting angle is not appropriate.
3. cutting angles should be matched with working material.
bond
1. screw thread machining with clearance angle.
2. reduce the thickness of the blade.
3. use surface treated screws to attack.
4. change the type of cutting oil and the way of oil injection.
5. reduce cutting speed
Chip clogging
1., we should use the forward wire attack or the spiral wire attack.
2. enlarge the lower aperture.

Tapping vibration wave

Excessively sharp
1. reduce cutting angle
2. grinding the clearance angle between the small thread parts
Improper grinding
1. avoid cutting edge thickness too small.
2. do not grind the bottom of the ditch.
3. about the durability of screw attack.

Taps break

Chip clogging
1. replace tap material
2. to prevent iron filings from blocking (or using the forward wire attack, spiral wire attack, no groove wire attack).

3. increase the chip tank.

4. cleaning the bottom hole and cutting chips around the workpiece.

5. ensure removal of chip space.

Excessive torque in cutting
1. expand the hole as far as possible.
2. shortening tapping length
3. use fine thread.
4. in order to increase the sharpness of screw attack, increase the cutting angle.
5. in order to reduce friction and torque, the clearance angle of threaded part can be slightly increased, and the thickness of the blade will be reduced.
6. use spiral wire to attack

Inappropriate use conditions

1. reduce cutting speed
2. prevent screw attack from lower hole eccentric or inclined.
3. the clamping action of screw attack adopts floating type.
4. adjustable tapping device.
5. do not pass through the hole, prevent screws from hitting holes.
6 prevent working hardening of bottom hole.

7. maintain stable feed.

8. remove iron filings from the previous process.

9. investigate the hardness and uniformity of machined materials.

Improper grinding
1. do not grind the bottom of the ditch.
2. avoid excessive blade thickness.
3. wear parts should be worn away.
4. early regrinding time

Blade avalanche
Improper selection of screw tap
1. reduce cutting angle
2. transform screw tap material
3. reduce hardness
4. eat in and lengthen.
5. prevent chip blockage.
6. shortening thread length

7. remove all wearing parts.

8. avoid cutting edge thickness too small.

Inappropriate use conditions
1. reduce cutting speed
2. prevent center deviation and avoid eating time.
3. do not haste to turn through holes.
4. increase intake length
5. use flexible tapping fixture.
6. improving coaxiality
7. prevent working hardening when machining bottom hole.

What are the problems needing attention in CNC machining

The emergence of CNC machine tools is a great progress in industry, it can better solve complex, precision, small batch, changeable parts processing problems, is a flexible, efficient automated machine tools. Programmers must first process analysis when they use NC machine tools. Whether they are programmed manually or automatically, they need to select the right machine tools, work out the processing plan, determine the processing sequence of the parts, the cutting tools and clamps used in each process according to the material, contour shape and machining accuracy of the workpiece to be processed. Tools and cutting oil. The following is a brief introduction of the problems that need to be paid attention to when choosing CNC machine tools.

First, the basic characteristics of NC machining.

(1) the process content of NC machining is more complicated than that of ordinary machine.

(2) the programming of NC machine tools is more complicated than the compilation of common machine tools. This is because in the ordinary machine tool processing technology do not have to consider the problem, such as the working procedure of the step arrangement, tool point, tool change point and path determination, etc., in the preparation of CNC machining process, but to seriously consider.

Two. Main contents of NC machining process

(1) Select the parts suitable for machining on NC machine tools, analyze the drawings of the parts, define the processing content and technical requirements, and determine the processing scheme.

(2) Designing NC machining processes, such as the division of processes, the choice of cutting tools, fixture positioning and installation, the determination of cutting parameters, the determination of tool path, etc.

(3) adjust the procedure of NC machining process. For example, tool selection, tool changing number and tool compensation.

(4) allocate tolerance in NC machining.

(5) process part of process instructions on CNC machine tools.

Three. The use of special cutting oil.

Four, commonly used numerical control processing method.

(1) Plane hole parts are usually machined by point position and linear control NC machine tools. When choosing the technological route, the two principles of machining accuracy and efficiency are mainly considered.

(2) rotary parts are usually machined by CNC lathes or grinders.

Considering the machining efficiency: in the lathe processing, usually machining margin is large, must be reasonable arrangement of rough machining route to improve processing efficiency. In practice, it is generally not suitable to use circular instructions, otherwise the empty knife with machining feed speed is too large. A better way is to remove materials from rough cars as soon as possible, and then finish the car.

Consider tool tip strength: low strength cutting tools are often used for machining small grooves on CNC lathes.

(3) When machining planar contour parts with NC milling machine, attention should be paid to the need to use small straight or circular segments to approximate the processed contour when machining irregular curves. When approaching, the workpiece error should be within the qualified range and the number of program segments is less.

These are the problems that need to be paid attention to in NC machining. Through continuous improvement of workpiece raw materials, equipment technology, cutting parameters and so on, the technological level can be greatly improved.

The key points of choosing injection molding machine

When we purchase the injection molding machine, we should choose the kind of injection molding machine with high degree of automation, complete functions and high production efficiency. Modern injection molding machines can be operated manually, semi-automatically and automatically. As long as the design and manufacture of the mold is reasonable, the automatic operation from injection filling to ejection and fall of the product can be realized, and the manipulator equipped with the mold can be operated unmanned. Core pulling and inserting function, hydraulic nozzle control function and rapid heating runner probe function can be programmed into the injection molding cycle automation program for automatic circulation.

How to choose high production efficiency? It is mainly manifested that the molding cycle of each mould product is as short as possible under normal injection molding conditions. This is the most important index reflecting the comprehensive performance of each system of an injection molding machine. Therefore, it is necessary to adopt high-quality hydraulic and electronic components and adopt precise manufacturing technology to improve the sensitivity of the injection molding machine system and to grasp the accuracy of various dimensions, so as to ensure the efficient operation of the injection molding system of the injection molding machine.

Test model 2

One of the key points of selecting and purchasing injection moulding machine is the best energy-saving and environmental protection, which can not be ignored in judging modern injection moulding machine. Energy saving mainly reflects the injection molding machine’s ability of saving water and electricity compared with the similar machine under normal technological conditions in power drive system, heating system and heat dissipation system. Now the injection molding machine design should take full account of the “environmental protection” factor. Injection molding machine should prevent leakage of hydraulic oil or excessive noise, and work quietly in bass. In addition, the injection molding machine itself should also use more environmentally friendly materials.

Injection molding machine on board

The last point of choosing the injection molding machine is to facilitate the maintenance and repair of the machine. The installation position of various machines such as mechanical, hydraulic, electronic and electrical components should be conducive to the maintenance and maintenance of the machines. At the same time, the universalization and standardization of injection molding machines are also very important to users.

How to visit the inquiry customers

Are there many guests who never know the price? I feel like I am making an offer every day. There are many customers every day, but there is no turnover. So where is the problem?

“How do you do?” Are you there? How did you consider it? ” For the first time, the new customers must not use this tone to return. It feels like you have put your hand into someone else’s pocket and paid for it.

“Hello, are you satisfied with your offer the other day? Is there any problem? If you have any questions, please point it out. I will certainly serve you. ” Is this feeling different? You can chat with guests and give guests a sense of consideration for your guests.

Visiting visitors is also a skill.

First, for less sincere guests, can delay two or three days to call back, attitude lower, reveal price advantages, surface sincerity, say the advantages of the product, characteristics, pros and cons analysis.

2. Afraid of high-priced and poor-quality customers (this kind of customer has no opinions, easy to fool), the first point to break out his concerns (for example: I actually buy things to take into account such a situation, but you can rest assured that our products show their sincerity, enthusiasm, self-confidence)

Three, 3.5.7 principles to use, three days after the quotation call back to listen to the other side’s views and opinions; seven days to deepen the impression, to resolve the previous customer’s views on you, deepen the other side’s recognition of you, 15 days to determine whether to follow up, no intention can choose to give up or continue to follow up!

Can not develop business, can we develop into friends, tie iron, business will be far away?

As long as you take the initiative, there will be a story between the guests.

Measuring index of machine tools

he quality of the machine tool directly affects the quality of the machine. Measuring the quality of a machine tool is multifaceted, but the main requirements are good workmanship, serialization, generalization, high degree of standardization, simple structure, light weight, reliable work, high productivity. The specific indicators are as follows:

1. Possibility of process

The possibility of technology refers to the ability of machine tools to adapt to different production requirements. Universal machine tools can complete a certain range of parts within a certain size of multi-process processing, the possibility of technology is wide, so the structure is relatively complex, suitable for single piece of small batch production. The special machine tool can only complete one or several parts of a specific process, the possibility of its process is narrow, suitable for mass production, can improve productivity, ensure processing quality, simplify the structure of the machine tool, reduce the cost of machine tools.

2. Accuracy and surface roughness.

In order to ensure the accuracy and surface roughness of the machined parts, the machine itself must have certain geometric accuracy, kinematic accuracy, transmission accuracy and dynamic accuracy.

Geometric precision refers to the accuracy of mutual position between parts and the shape and position accuracy of main parts when the machine tool is not running. Geometric accuracy of machine tools has an important impact on machining accuracy, so it is the main index to evaluate the accuracy of machine tools.

Motion precision refers to the geometric position accuracy of the main parts when the machine tool is running at the working speed. The greater the change of geometric position, the lower the motion accuracy.

Transmission accuracy refers to the coordination and uniformity of the movement between the ends of the transmission chain of machine tools.

The above three precision indicators are tested under the condition of no-load. In order to fully reflect the performance of the machine tool, it is necessary to require the machine tool to have a certain dynamic accuracy and the shape and position accuracy of the main parts under the action of temperature rise. The main factors affecting dynamic accuracy are stiffness, vibration resistance and thermal deformation of organic beds.

The stiffness of the machine tool refers to the ability of the machine tool to resist deformation under the external force. The greater the stiffness of the machine tool, the higher the dynamic accuracy. Stiffness of machine tools includes stiffness of machine parts and contact stiffness between components. The stiffness of machine tool components mainly depends on the material properties, section shape and size of the components themselves. The contact stiffness between components is not only related to the contact material, the geometric dimension and hardness of the contact surface, but also to the surface roughness, geometric accuracy, machining method, contact surface medium, pre-pressure and other factors.

Vibration on machine tools can be divided into forced vibration and self excited vibration. Self-excited vibration is a kind of continuous vibration generated by the cutting process without any external force and exciting force. Under the continuous action of the exciting force, the forced vibration of the system is forced vibration.

The aseismic property of machine tools is related to stiffness, damping characteristics and quality of machine tools. Because the thermal expansion coefficient of each part of the machine tool is different, the deformation and relative displacement of each part of the machine tool are different. This phenomenon is called thermal deformation of the machine tool. The maximum error due to thermal deformation can account for 70% of the total error.

There is no unified standard for the dynamic accuracy of machine tools. The dynamic accuracy of machine tools is evaluated indirectly by the accuracy achieved by cutting typical parts.

3. Serialization and so on

Serialization, generalization and standardization of machine tools are closely related. Variety serialization is the basis of generalization and standardization of parts, while generalization and standardization of parts promote and promote variety serialization.

4. The life of machine tools

The reliability and wear resistance of machine tool structure are the main indexes to measure the service life of machine tools.

Automation equipment: your work attitude determines your life

All kinds of things can’t be carried away. In modern society, the Internet connects everything, and having its own diamond is more important than ever before. Work itself is a paid practice, a good mentality will make you stronger and stronger, step by step towards the top of life.

Serious 1

1, be willing and hardworking.

Everything you do is beautiful. Do it as soon as possible, do not drag on, and do it diligently.

2, maintain a balance between work and rest.

Regular and healthy life, how the strength of life is also, will also increase the sense of security. Work is necessary, but not everything. We can’t be slaves to work. The allocation of life time requires allocation of intelligence and balance. In the work, we should not neglect the communication between family members, love sharing and care, and the maintenance of their own health. It is undeniable that constant busyness makes people die and overwork makes life joyless.

3, love colleagues and team

No matter how capable and hard a man is, he can never achieve anything in his career or enjoy his work unless he can work with others happily and cooperate with them. Cooperation requires open-mindedness, trust, consideration, reliability, friendliness, courtesy, good communication skills, a cheerful and cheerful personality, empathy, willingness to give and not care.

4, softness and humility in the heart

In the workplace, we need to be gentle and humble, take the lead in getting the opportunity to communicate with colleagues, out of genuine love for your colleagues, for their sake, to help them work hard together, not out of competition but out of love, so that colleagues will be interested in our future sharing. We have the opportunity to show love and acceptance to others, the ability to share love with bosses, coworkers, friends, family members, and even people we meet by chance, and this ability is manifested in the first time we work together and give in a team.

If you act in love, you will turn your life and hardship into good wishes. Use good behavior to influence your colleagues and work.

Maintain

So first of all, establish the right mentality: I can’t be afraid to work, to work is to let me exercise, not the leader intentionally want to torture me.

Secondly, I have to put myself in the right place: I have to figure out how to deal with this matter properly, reflect my ability, and thus achieve a sense of accomplishment.

Then be willing to do a little more, take on a little more, and keep letting colleagues and leaders discover that you can do more and have potential for development.