In almost all stamping dies, a large number of elastic elements and springs are used. Among these elastic elements, there are various elastic standard elements, urethane glue, nitrogen springs, etc., and different elastic elements are selected according to different requirements. For example, for bending and punching, it is enough to use common rectangular elastic elements. For example: according to the color, the brown spring can also be called the brown spring; if the elasticity is not enough, add a nitrogen spring. However, the nitrogen spring is more expensive, so the mold cost is a little higher; among them, there is also an elastic element called Youli glue. This kind of elastic element is very cheap, but the service life of the spring is relatively short. This is generally used for drawing dies, shaping dies, or flatness.
picture
The effect of using Uril glue for the deep drawing die is relatively good. Of course, nitrogen springs can also be used. Others such as jacking pins, floating blocks, dual-purpose pins, etc. generally use wire springs or yellow springs, etc., as long as they can remove the material, do not push the product out of the print, and the top is deformed. The characteristic of Uril glue is that its elasticity is relatively balanced, but because of its relatively short service life, it may crack after a period of time. Therefore, it is generally used less, and more Uril adhesive is used for flatness.
Springs include rectangular springs, wire springs, etc. The purpose of springs is to remove and press materials. The strength of the springs is related to whether the mold production is smooth and the products are qualified. The elastic force of the spring is small, which is very easy to cause the deformation of the product due to the inability to hold the material, the mold does not fall off the material, the product is not easy to take out from the mold, the material is carried, the knife edge and the punch are easily worn and other problems.
Rectangular springs are generally classified according to their colors: brown, green, red, blue, and yellow, and their elastic force is also weakened accordingly. According to different colors, the elastic force is different, and the amount of compression is also different.
Here is a simple way to calculate the compression of the spring: we measure the total height of the spring in advance, then put the spring in a vise, lock it, and then use a caliper to measure the remaining length of the spring after it is clamped dead, and then use the spring Subtract this number from the total length, and then divide it by the total length. This method is common to any spring. For example, if the length of the brown spring is 60mm, there should be about 45.6 left after being clamped by the vise, and then we Subtracting 45.6 from 60 equals 14.4, and dividing 14.4 by 60 equals 0.24, and this is how much it compresses.
The spring is used according to different spring times, such as 1 million times, 500,000 times, and 300,000 times. The larger the compression amount, the shorter the service life of the spring and the shorter the service life of the mold (of course, if the spring is broken, it can be replaced. ), the spring may break when the mold is measured for a period of time, or it may lose its strength directly, and the spring with poor quality is easy to break inside the mold.
Generally, the compression amount of the spring is calculated according to 300,000 times, that is to say, the spring may lose strength after the mold is hit 300,000 times. Of course, the service life of ordinary stamping dies is not so long, and it can also be calculated according to the maximum compression. If calculated according to the maximum compression, it can only ensure that the spring does not explode in the mold. It is also good for the flatness of the product if the mold is pressed to death.
picture
Maximum compression (how much the spring can be pressed down), the maximum compression of the spring is equal to the original height of the spring X the maximum compression ratio of the spring, for example, a brown spring with a length of 60mm, then its maximum compression is: 60*24% It is approximately equal to 14. This spring can be pressed down by a maximum of 14 mm. Its maximum stroke is 14 mm. The stroke of the mold must be less than 14 mm. If it exceeds 14 mm, the spring may fail, deform, or It may be broken inside the mold, or the mold may explode, and the punch cannot be pressed down.
Before the mold is assembled, that is, before the mold is installed, it is necessary to calculate whether the compression of the spring is appropriate, so that there is no need to worry about the problem of the mold, explosion, etc. during the mold test.
