In almost all stamping dies, a large number of elastic elements and springs are used. In these elastic elements, there are a variety of different elastic standard parts, excellent glue, nitrogen gas springs, etc., and different elastic elements are selected according to different needs. For example, like bending, punching, it is enough to use the common rectangular elastic element. For example: brown springs by color can also be called coffee springs; If the elasticity does not work, add a nitrogen gas spring. However, nitrogen gas springs are more expensive, so the mold cost is a little higher; Among them, there is also an elastic element, called Uniglue. This elastic element is very cheap, that is, the service life of the spring is relatively short. This is typically used for drawing dies, shaping dies, or flatness.
The effect of using excellent glue for deep drawing die is relatively good, of course, you can also choose nitrogen gas spring. Others such as top material pins, floating blocks, dual-purpose pins, etc. generally use wire springs or yellow springs, as long as they can be removed, do not eject the product out of the print, top deformation. The characteristic of Youli glue is that the elasticity is relatively balanced, but because its service life is relatively short, it may crack after a period of time, so it is generally used less, and the whole flatness of Youli glue is used more.
The spring includes rectangular spring, wire spring, etc., the intention of the spring is to remove material, press material, the size of the spring force, related to whether the mold production is smooth, whether the product is qualified, etc. The spring force is small, which is very easy to lead to various problems such as deformation of the product due to the lack of pressure on the material, the mold is not unloaded, the product is not easy to take out from the mold, the material is stripped, and the knife edge and punch are simply worn.
Rectangular springs are generally divided according to their color can be divided into: brown, green, red, blue, yellow, its elasticity is also weakened, according to different colors, the elasticity is different, and the amount of compression is also different.
Here there is a soil method to calculate the compression of the spring: in advance we measure the total height of the spring, and then put the spring in the vise, lock, and then use a caliper to measure the remaining length after the spring clamping, and then subtract this number with the total length of the spring, and then divide by the total length, this method is common to any spring, for a simple analogy, such as the length of the brown spring is 60mm, there should be about 45.6 left after being clamped by the vise, and then we use 60 minus 45.6 equals 14.4, then divide 14.4 by 60, the result is equal to 0.24, and this is its compression.
According to the number of times the spring is used, such as 1 million times, 500,000 times, 300,000 times, the greater the compression selection, the service life of the spring
The shorter the mold, the shorter the service life of the mold (of course, the spring can be replaced if it is broken), the mold may break the spring for a period of time, or it is directly weak, and the spring with poor quality is easy to break in the mold. Generally, the compression amount of the spring is calculated according to 300,000 times, which means that the mold may be weak when hitting the spring 300,000 times. Of course, the service life of the general stamping die is not so long, and it can be calculated according to the maximum compression amount. If the maximum compression is calculated, it can only ensure that the spring does not burst in the mold. The mold is pressed to death, which is also good for the flatness of the product.
The maximum compression amount (how much this spring can press down), the maximum compression of the spring is equal to the original height of the spring X the maximum compression ratio of the spring, such as a brown spring, the length is 60mm, then its maximum tightening is: 60 * 24% is about equal to 14, this spring can be pressed down up to 14 mm, its maximum stroke is 14 mm, the stroke of the mold must be less than 14 mm, beyond 14 mm, the spring may fail, deform, and may be interrupted in the mold, Or the mold bursts, the punch cannot be pressed, etc.
Before the mold is assembled, that is, before the mold is installed, it is necessary to calculate whether the tightening amount of the spring is appropriate, so that there is no need to worry about the mold will have problems and burst when trying the mold.