Language : Chinese
It seems that the existing stamping dies use a large number of spring elements. Among these elastic parts, there are various elastic standard parts, excellent glue, nitrogen gas spring, etc. Different spring elements can be selected according to different requirements. For example, like bending and punching, it is sufficient to use common rectangular elastic elements. If the elasticity is not enough, replace the gas spring. However, nitrogen gas springs are more expensive, so the cost of the mold is higher; there is also a flexible original, called high-quality glue. This kind of elastic element is very cheap, that is, the service life of the spring is relatively short. Generally used for deep drawing molds, plastic molds, or complete flatness.
The effect of high-quality lacquer used for drawing molds is quite good, of course, nitrogen gas springs can also be used. Others, such as top material pins, floating blocks, dual-purpose pins, etc., generally use wire springs or yellow springs, etc., as long as it can be peeled off, the product will not be pulled out for printing, and the top deformed. The characteristic of Uniglue is that its elasticity is relatively balanced, but due to its relatively short service life, it may break after a period of use. Therefore, it is usually used less and has excellent overall flatness.
Spring includes rectangular spring, steel wire spring, etc. The function of the spring is to remove and press down. The size of the spring force is related to whether the mold production is smooth. Whether the product is qualified. The spring has a small spring force, which can easily cause the product to deform due to material failure. The mold does not remove the material, the product is not easy to take out from the mold, the strip material, the knife edge, the hole is simply abraded and other problems.
Rectangular springs are generally divided into colors: brown, green, red, blue, and yellow, and their elasticity is also weakened. Depending on the color, the elasticity is different, and the compression amount is also different.
This is a simple way to calculate the amount of spring compression:
We measure the total height of the spring in advance, then place the spring in a vise and lock it; then use a caliper to measure the remaining length of the spring after clamping, then subtract the total length from the total length of the spring and divide by the total length . Yes, this method is applicable to any spring.
For example, if the length of the brown spring is 60mm, it should be kept at about 45.6 after being clamped in a vise. Then we subtract 60 from 45.6 to 14.4, and then divide 60 by 14.4. The result is 0.24, which is the amount of compression. The number of springs varies with different springs. For example, there are 1 million times, 500,000 times, 300,000 times, and so on. The greater the compression, the shorter the service life of the spring and the shorter the service life of the mold (of course, the spring is broken. It may change), the mold will break for a period of time, otherwise the spring will break, or the force is not good, the spring quality is poor, and it is very Easy to break in the mold.
Generally, the compression amount of the spring is calculated based on 300,000 times, that is, the spring may be invalid when the mold is used 300,000 times. Of course, the average stamping die life is not very long, but it can also be calculated based on the maximum compression. If calculated by the maximum compression, you can only ensure that the spring will not explode in the mold. The mold is compressed a little, which is beneficial to the flatness of the product.
The maximum compression (how much this spring can press) is equal to the original height of spring X. The maximum compression ratio of the spring, such as the brown spring, the length is 60 mm, and then the maximum shrinkage rate: 60 * 24% is approximately equal to 14. The spring can be pressed down by 14 mm, the maximum stroke is 14 mm, and the mold stroke is less than 14 mm , Over 14 mm, the spring may fail, deform, and may break. Inside the mold, or the mold is explosive, the press cannot be pressed.
Before the mold is assembled, that is, before the mold is installed, it is necessary to check whether the tightening amount of the spring is appropriate, so that there is no need to worry about mold explosion when testing the mold.