The punch is a stamping press. In the national production, the stamping process saves material and energy due to more traditional mechanical processing, has high efficiency, has low technical requirements for the operator, and can achieve the advantages of products that cannot be achieved by machining through various mold applications. Its use is more and more extensive.

(1) Punch wear too fast

1 mold gap is too small, the general Jian Han mold gap for the material thickness of 20%, 25%.

2 The centering of the convex and concave molds is not good, including the mold base and the mold guide components and the lack of accuracy of the turret inserts, which causes the mold to be not good for the towel.

3 The punch temperature is too high, mainly due to the overheating of the punch caused by the continuous stamping of the same die for a long time.

4 Inappropriate mold grinding methods cause mold annealing and increased wear.

5 Partial unilateral punching, such as nibbling, angle punching or shearing, aluminum alloy doors and windows fittings lateral force will bias the punch to one side, the clearance of the edge is reduced, resulting in serious mold wear, if the machine tool mold installation accuracy Not high, serious punch will be biased over the upper die, causing the male and female die damage.

(2) mold material problem

Mold material will cause waste to rebound, and its related factors:

1 The sharpness of the cutting edge of the die, and the larger the roundness of the blade, the more likely it is that the waste will rebound.

2 Incoming moduli of the mold, the upper mold of the machine tool is certain, the mold of the mold is small, and it easily causes the waste to rebound. Die people WeChat: mujudaren

3 The clearance of the mold is reasonable, if the mold clearance is not suitable, it will easily cause the waste to rebound.

4 whether there is a lot of oil in the sheet processed.

5 Spring fatigue damage.

Ways to prevent mold strips:

1 Use a special anti-material die. Aluminum alloy door and window accessories

2 The mold is often sharpened sharply and demagnetized.

3 Increase the die gap.

4 The oblique edge n die is used instead of the flat edge die.

5 mold installation remover.

6 increase the mold's modulus.

7 Check the fatigue strength of the mold spring or unloading sleeve.

(3) mold neutrality problem

The wear of the mold in the use of the towel is prone to occur at different locations on the punch core. Some parts have large scratches and wear quickly. This is especially noticeable in narrow rectangular molds. The main reason for this problem:

1 Machine turret design or machining accuracy is insufficient. The centering of the upper and lower turntables and die mounts is not good. 2 The design or accuracy of the mold cannot meet the requirements.

3 The precision of the guide bush of the die punch is not enough.

4 mold gap is not suitable.

5 The mold mount or mold guide sleeve is not neutral due to long-term wear.

To prevent inconsistent mold wear, it should:

1 Regularly use the centering bar to perform neutral inspection adjustments on the machine turret and mounting base.

2 Replace the mold guide bushes in time and use the convex and concave molds with proper clearance.

3 using full-lead mold.

4 Strengthen the sense of responsibility of the operators, find the reasons in time after discovery, and avoid causing greater losses.

(4) Use of special forming dies

In order to meet production needs, it is often necessary to use forming dies or special dies, mainly including bridge dies, shutter dies, counterbore dies, tapping tapping dies, boss dies, drawing dies, and modular dies. Forming the mold to everyone to improve production efficiency, but the higher the cost of foot forming mold, usually 4-5 times the ordinary mold. Mould person WeChat: mujudaren In order to avoid mistakes, we should pay attention to and follow the following principles:

1 When the mold is installed, check the direction to ensure that the convex and concave molds are installed in the same direction.

2 According to the requirement, adjust the stamping depth of the mold correctly. It is better not to exceed 0.15mm for each adjustment.

3 Use a lower punching speed.

4 Plates should be flat without distortion or tilting.

5 The forming process should be placed as far away from the clamp as possible.

6 Forming dies should avoid downward molding operation:

7 Press the first common mold stamping, and finally use the forming mold.

(5) Die spring fatigue damage

One problem easily overlooked in the use of punch molds is that the aluminum alloy door and window fittings are sufficient for the service life of the mold springs, and the mold springs also need to be regularly maintained or replaced. However, many domestic users can maintain the equipment and molds, but often neglect the mold springs. The maintenance, and even some users of the spring has not been replaced for many years, often with the station or mold damage or stamping tape, but can not find the cause, and later replace the mold spring, the problem has been completely resolved. For different punching equipment and molds, the type of mold spring is also different. If it is not properly maintained, mold material is easily generated and the mold or guide bush may be damaged, causing unnecessary losses.

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Ningbo Zhenhai Xinxie Machinery Co.LTD , https://www.xinxie-diecasting.com