chengcg – Page 124 – CNC Machining & Turning, Milling, Metal parts

Principle of vacuum suction for CNC machining die

Generally speaking, swindling vacuum sucker to grab the finished product is the cheapest way. There are various types of vacuum suction cups. The rubber suction cups can be operated under high temperature. The silicon rubber suction cups are quite suitable for catching the rough finished products. The polyurethane suction cups are very durable. In addition, in essence, if the sucker is required to have oil resistance, it is advisable to study the use of polyurethane, nitrile rubber or vinyl containing polymers and other raw materials to manufacture the sucker. Generally, in order to prevent the surface of the finished product from being scratched, it is better to choose the suction cup with wave tube made of NBR or silicone rubber as the raw material, which is made of NBR and has great breaking force, so it is commonly used in various vacuum holding equipment.

2、 The vacuum sucker used on the CNC computer gong is the foot color of the fixture beside the CNC machining center. Some workpieces require high surface smoothness, so the fixture of the commonly used CNC computer gong cannot be used. At this time, the vacuum sucker can be used. But we seldom use the vacuum sucker made of rubber near the CNC computer gongs, but more use the CNC vacuum sucker. The so-called CNC vacuum sucker is a kind of unique vacuum sucker that uses a vacuum generator plus a switch. The principle of drawing is the same as that of rubber vacuum sucker. They all create a vacuum environment to make the atmospheric pressure press the sucker on the workpiece, but the CNC vacuum sucker The vacuum of is produced by the vacuum generator in the vacuum environment, and there is a big difference in the appearance. The rubber vacuum sucker is a simple vacuum element, while the CNC vacuum sucker is the same as a big plate. The use of vacuum sucker in CNC computer gongs is usually due to the fact that the workpieces processed have high requirements for surface smoothness. Maybe it is only used when the fixture of CNC computer gongs cannot clamp the workpieces very well. It is a unique and cheap fixture in CNC machine tools.

What processing equipment is necessary for parts processing factory

A capable hardware processing factory, what equipment do they have to process what products? Maybe this is a problem that many people are paying attention to. How many processes do we usually see for electronic hardware products? Today, small textile focuses on explaining to the public what kind of mechanical equipment does a capable hardware processing plant have to be capable of? Let’s have a brief introduction.

1. Must have milling machine

2. Must have CNC lathe

3. Must have automatic lathe

4. Must have CNC machining center

5. There must be a cutting machine

6. Must have grinder

7. There must be a thunder carving machine

8. Must have three-dimensional testing instrument

9. Must have product protection equipment

10. There must be a supplier of high-quality product surface treatment

Gantry CNC for gantry milling

This type of cutting machine is of gantry structure, with a transverse span of 3M, 4m, 5m, 6m, 8m and other specifications. It is driven bilaterally with stable operation, good configuration and high working efficiency. It can be used for cutting large, medium and small steel plates of various carbon steel, manganese steel, stainless steel and other metal raw materials. According to the user’s requirements, more cutting torches can be configured, or a dual-purpose cutting method of special-shaped cutting and straight cutting can be configured, in addition, an automatic capacitance or plasma heightening system can be selected.

System characteristics

1. The system has improved performance, high stability, strong anti-interference, and is applicable to all kinds of plasma power sources outside China;

2. Highlight the value advantage and have a strong price ratio

How to ensure that the automobile inspection tool products are qualified in the actual inspection

Vehicle inspection tools are simple devices used by industrial manufacturers to control various sizes of products. They are used for a large number of manufactured products, such as auto parts, to replace special measuring devices, such as vernier caliper, depth gauge, etc.

The automobile inspection tool is developed according to the special planning and design requirements of the vehicle type. It can be used to measure and evaluate the size and size of the special automobile inspection tool by fraud. It is mainly used for the measurement and adjustment of mold accuracy in the manufacturing planning stage and the daily treatment of the size after batch manufacturing.

The main body of the vehicle inspection tool is the key frame of the inspection tool, including the base (reference plane), vehicle surface and installation part of the inspection tool. Generally speaking, the base and vehicle surface are made of epoxy resin or aluminum.

It is required that the die body mounting part must be able to receive the turning force with the mounting strength of 12n · m (122kgf · cm). Therefore, when the material of the main body is resin raw material, it is necessary to use metal parts to manufacture the lighting installation part, so as to prevent the lighting from falling and circling during loading and unloading.

Automobile inspection tool manufacturing is usually divided into aluminum parts, iron parts or resin parts. When it comes to daily maintenance and service life, we should take care of them regularly. Occasionally surface treatment such as spraying is required. Some matters that need to be paid attention to in the design of vehicle inspection tools:

(1) Lesson space

(2) Portability

(3) Use some body parts to reflect the reproducibility

We are open to business

During the epidemic, we still work hard and hope all will be well in the world. If you need CNC machining, please contact us. We are open to business .

The difference between fixture two color mold and rubber covered mold

A. Two color mold: two kinds of plastic raw materials are injected into the same injection molding machine in two times, but the products are only produced once. Usually this kind of molding process is also called double material injection molding. It is usually completed by a set of molds, and special two-color injection molding machine is required. Weixun two-color mold B. rubber covered mold (secondary molding): two kinds of plastic raw materials are not sure to be injected on the same injection molding machine, which are divided into two times of molding; the products are taken out of one set of mold, and then put into another set of mold for the second injection molding. Therefore, usually this kind of molding process is usually completed by two sets of molds, without the need for special two-color injection molding machine. Overview of two-color mold and rubber covered mold: in the design of rubber covered mold, attention should be paid to the positioning of hard rubber parts. It is necessary to achieve * sealing and have anti slope holes on the rubber parts, so as to prevent rubber deformation. At present, the two-color mold is increasingly popular in the market. In this process, it is better to make the appearance of the product more beautiful, easy to change color and not spray, but the cost is high and the technical requirements are high

1. The two forms of cavity are different. Farewell forms a product. The two forms of core are exactly the same. 2. After the front and back dies of the die rotate 180 o in the center, they must be consistent. Make sure to do this test when designing. 3. Pay attention to the position of the top pinhole with a minimum interval of 210mm. For large moulds, the number of holes in the ejector pin shall be increased appropriately. Moreover, since the ejector attached to the injection molding machine itself can not be long, we must design a long ejector in our mold, and the ejector will grow 150 mm out of the mold base plate for control. Two locating rings must be designed on the back mold bottom plate. 4. The total thickness of front formwork panel plus a plate shall not be less than 170mm. Please carefully check other reference data of this type of injection molding machine, such as the maximum mold thickness, the minimum mold thickness, the spacing of the top stick hole, etc. 5. It is better to design the nozzle of the three plate mold as the automatic demoulding behavior. Special attention should be paid to the demoulding behavior of the soft rubber nozzle. 6. The depth of sprue at the front side shall not exceed 65mm. The distance between the top of sprue on the upper side (large water port) and the center of mold embryo shall not be less than 150 mm. 7. In the design of the second injection molding of the cavity, in order to prevent the insertion (or rubbing) of the cavity from damaging the product glue position which is still well formed for the first time, it is advisable to design a part of the cavity avoidance. However, we must carefully study the strength of each sealing position, i.e. in injection molding, is there any possibility of plastic deformation under large injection pressure, resulting in the possibility of batch front in the second injection molding? 8. During injection molding, the product size of the first injection molding may be slightly larger, so that it can be pressed more tightly with another cavity during the second molding to achieve the sealing effect. 9. Pay attention to whether the flow of plastic in the second injection will impulse the products still forming for the first time and make their glue position deformed? If this is possible, we must think of ways to improve. 10. Before closing the A and B plates, pay attention to whether the front mold slider or lifter will reset first and crush the product? In this way, we must find a way to close the die on board a and B first, and then the slider or life of the front die can be reset. 11. although the water transportation deployment of the two CAVITY and CORE is sufficient, they are balanced and the same. In 12.99% of cases, the hard part of the product is injected first, and then the soft part of the product is injected. Because soft rubber is easy to deform.

The gantry milling machine has enough rigidity

The gantry milling machine is suitable for milling the horizontal plane, vertical plane or inclined plane groove of large and medium-sized ferrous metal or non-ferrous metal parts on various machines, milling and boring head, boring and drilling as well as various improvements according to the needs of users, and undertaking various processing and manufacturing at the same time.

The gantry milling machine has the characteristics of enough rigidity, high efficiency, convenient operation, simple structure and comprehensive performance.

The main drive of gantry milling machine adopts switched reluctance motor (planer and milling dual-purpose gearbox) with stepless speed regulation. Its wide speed regulation range can meet various speed requirements of planer and milling. It can process horizontal plane, vertical plane, inclined plane, T-groove, circular arc groove, guide rail combination surface and rack of various materials

1. The advanced super audio frequency quenching technology makes the service life of the machine tool longer.

2. The column and crossbeam separate feeding system makes the operation more convenient and quick.

3. Independent oil pump lubrication system makes all kinds of work more smoothly.

4. All castings are aging and vibration aging treatment, so that the machine tool is more stable and durable, and the accuracy is more durable.

The principle of fast clamp

This kind of quick clamp is designed according to the mechanical principle of the double rocker mechanism in the plane four-bar mechanism, and its basic structure is composed of four components, such as connecting rod, frame and two connecting frame rods.

When the two hinge points of connecting rod and connecting rod and one hinge point of connecting rod and frame are in the same straight line, the mechanism is in the dead point position. At this time, no matter how much reaction force (except destructive reaction force) is exerted on the compacted workpiece, the indenter can not be loosened, which is the dead point clamping principle in mechanical mechanics.

In order to avoid the influence of external force load change and mechanical vibration in use, the middle hinged joint shall be slightly inclined to the inner side of the other two hinged joint wires during design, so as to ensure that the clamp mechanism is always locked in a stable state without loosening under the condition of maximum central tightening force.

Central nervous system

The central tightening force refers to the maximum pressing force of the ram on the workpiece when the fixture is in the locked position without mechanical deformation. This pressing force is generated when the ram is raised to the nearest position from the mounting base on the force arm.

The pressure of the indenter to the workpiece is not constant, it changes with the different position of the indenter on the force arm. When it is far away from the mounting base, the clamping force decreases.

Characteristic

Simple structure and installation.

The clamped workpiece can be loaded and unloaded quickly and operated conveniently.

All parts are electroplated and antirust, and the surface is clean and beautiful.

The key parts of the fixture for heavy load have been heat treated to have high strength and wear resistance.

Matching requirements of automatic parts processing punch

According to different stamping materials, the design of stamping die is different, which is basically through multi-step stamping to complete a product or semi-finished work. Different steps require different shapes and specifications of cemented carbide punches, which is designed to match the special punches of the stamping die for customized production. According to different shapes and uses, the special-shaped carbide punching needles can be divided into:

Guide punch is also called guide punch for short. According to the needs of the press, there can be various shapes, such as type A, type B, type Hb, type TAPP, type TP, etc.

It’s also called mother and child punch. It’s called mother and child punch for short. There is a small protrusion at the top of the punch. I don’t know the origin of the name, maybe it’s because of the protrusion at the top of the punch. The letter punching needle can be divided into standard A-type JS * * type and other models.

There are teeth drawing punch, inspection tip, hexagonal punch, elliptical punch, forming punch, fan punch, special punch, high-speed steel punch, tungsten steel punch, etc.

The key point of cemented carbide punching pin customization is to design the accuracy and consistency of products, and its physical parameters are as follows:

1. CO content: 10% – 20%. 2. Density g / cm3: 14.0-14.5.

3. Hardness: 87-92.0hra. 4. Grain size: 0.6-1.2um.

5. Bending strength: 4000mpa. 6. Elastic modulus GPA: 490.

7, coefficient of thermal expansion 10-6 / 0C: 5.4. 8. The external dimension specification of cemented carbide punch is customized according to the drawing, and the accuracy requirement is ± 0.002.

The precision of carbide punching needle used in high-precision die matching is very high, and the consistency of products is also required. Every punching needle in batch production must be strictly in accordance with the requirements of dimensional accuracy tolerance, so as to maximize the service life of die. The consistency of products is a key factor for the use of carbide punching pins as a complete set of precision dies, which will directly affect the service life of dies and the dimensional accuracy of products.

The stamping die work is continuous operation, so the service life requirement of the hedging needle becomes the focus. According to the material and thickness of the stamping, different alloy materials should be selected for the hard alloy punching needle. Generally, the thicker the product is, the lower the hardness and the better the toughness of the hard alloy should be selected. The harder the material is, the harder the cemented carbide is, the lower the hardness is. This can effectively avoid the punching needle being missed. For the punching of thin plates, or those with low hardness, the carbide punching needle can be used with higher hardness for hole processing of this product, so as to improve the service life of the punching needle.

In addition to the selection of cemented carbide materials, one of the important factors affecting the quality and service life of the punching needle is whether the gap between the cold dies is even. In the process of hard alloy punching pin assembly, it is necessary to ensure that the gap between the convex die and the concave die is the same. In order to ensure that the gap between the punch and the die is even, the position of one piece (punch or die) must be determined first according to the drawing requirements, and then the accurate position of the other piece can be determined by aligning the gap based on this piece. Some stamping dies are equipped with many hard alloy punches at one time, which requires the scientificity and rationality of die design.

There are several ways to control the gap between punch and die to be uniform when assembling punching pin:

1. Light transmission method: place and install the upper mold and the lower mold, irradiate with light or flashlight, and observe the light transmission in the blanking hole of the lower mold.

2. Gasket method: for copper or paper pieces with uniform thickness around the edge of the die and thickness equal to the unilateral gap between the punch and the die, insert the punch into the corresponding hole of the die, observe the tightness between the punch and the gasket, and gently tap the fixing plate with a hammer to make the tightness between the punch and the gasket consistent. After proper adjustment, fasten the upper die.

Advantages of precision metal processing

1. CNC machining precision of precision metal shaft is high, with stable machining quality;

2. It can carry out multi coordinate linkage and process parts with complex shapes;

3. When the precision hardware CNC machining parts are changed, generally only the NC program needs to be changed, which can save the production preparation time;

4. The machine tool itself has high precision and rigidity, so it can choose favorable processing amount and high productivity (generally 3-5 times that of ordinary machine tools);

5. The machine tool has a high degree of automation, which can reduce the labor intensity;

CNC precision machining uses short cutting tools, which is the main feature of precision hardware parts. The short cutting tool will obviously reduce the deviation of cutting tool, so as to obtain good surface quality, avoid rework, reduce the usage of welding rod, and shorten the processing time of EDM. When considering the five axis machining, the goal of using the five axis machining die must be considered: to finish the machining of the whole workpiece with the shortest cutting tool possible, including reducing the programming, clamping and machining time, but also to get a more perfect surface quality.