CN1225323C - Progressive die two-step blanking method - Google Patents

Abstract

A progressive die two-step blanking method is composed of half blanking and push-off two working steps. In the semi-blanking step, the workpiece is separated from the scrap, and then the elastic part at the bottom of the die lifts the material, and then pushes it to the step of pushing away, and the workpiece and the scrap are separated by the push rod. In order to ensure the strength of the die and realize fixed-distance feeding at the same time, a groove space corresponding to the size of the blanking part can also be added in the middle of the two steps. The main advantage of the present invention is that it can eradicate the phenomenon of waste material ascending and waste material clogging during blanking, especially in automatic stamping processing, so as to ensure the continuity of the blanking process; for commonly used materials such as steel, aluminum alloy, copper alloy, etc. The noise emitted by the sound source of the cutting process reaches 4-9 decibels, which effectively improves the working conditions and purifies the industrial production environment.

Description

Progressive die two-step blanking method

Technical field The present invention belongs to the separation processing method of stamping process in metal plastic forming technology.

Background Art So far, the blanking process is still the most widely used stamping processing method, and the blanking die can obtain a blanking piece in one stroke of the press. However, there are still many problems in the punching process, such as the cross-section finish of the punched parts, dimensional accuracy, burrs, punching noise, waste upward and clogging, and so on.

After more than half a century of development, in order to solve problems such as the smoothness and burrs of the blanking parts, from the perspective of the operation steps of the punching process, there is the following method of changing a single step operation into a multiple step operation: 1958 Maeda Zhenzo invented a kind of upper and lower punching. In 1975, Makino Yuxiong invented the flat-press punching method. In 1977, H. Leibing invented the reverse three-step punching. In 1980, Maeda Zhenzo and Aoki Isamu Invented the rolling punching method.

Although these methods have solved the problems of cross-section smoothness, dimensional accuracy and burrs of the blanking parts well, there are still problems of waste materials going up and clogging and punching noise problems that have not been solved, and the process has been increased to varying degrees. Operational trouble. Although the reverse three-step punching proposed by H.Leibing has the effect of reducing the punching noise to a certain extent, the operation requires three steps, which is troublesome, and the mold structure is more complicated, and it is best to There are three-action presses, and in addition, the problem of waste upward and clogging has not been solved.

SUMMARY OF THE INVENTION The purpose of the present invention is to actively reduce the sound source noise of the blanking process and eliminate the phenomenon of waste material ascending and waste material clogging especially in the automatic stamping process (progressive die).

The present invention is realized through the following two working steps of the progressive blanking die. As shown in the accompanying drawings, in the first step, as shown in Figure 1(a), also known as the half-punching step, when the punch 2 descends to the bottom dead point, the punch only cuts into a certain depth h of the material, so that the workpiece It is not separated from the scrap, and then, with the return of the punch, the workpiece and the scrap are lifted from the die 1 and pushed to the pushing station; the second step, as shown in Figure 1(b), is also called Pushing away from the work step, the workpiece (or waste) is separated and pushed away from the die hole of the pushing station by the pushing rod 3 .

The depth h of the punch cutting into the material mentioned in the present invention has different depth requirements for different materials and different punching conditions, and the overall process requirement is to keep the workpiece and the waste material inseparable.

In general, for commonly used materials such as steel, aluminum, copper, etc., the depth h of the punch cutting into the material is preferably 0.7-0.8 of the material thickness t, that is, h=0.7-0.8t.

The process in which the workpiece and the waste material are lifted together from the die 1 in the present invention can be realized by placing an elastic member at the bottom of the die in the half-punching step. The upper plane of the die is on the same plane. When the punch returns, it will lift the workpiece and the waste from the die 1 to ensure smooth feeding and the strength of the entire die. The elastic member can be a spring member, rubber, polyurethane spacer or the like.

In order to ensure the strength of the die and realize fixed-distance feeding at the same time, the present invention can also add a groove space corresponding to the size of the blanking piece between the two working steps. Certainly the present invention also takes waste material side cutter formula fixed distance.

The production efficiency of the two-step blanking method is exactly the same as that of the traditional ordinary blanking. In fact, the ordinary blanking is transformed into a simple progressive die blanking, and the die clearance is also the same as that of the ordinary blanking.

The present invention can ensure the continuity of the blanking process operation, especially for the automatic stamping process, because the phenomenon of waste materials ascending and waste materials is eradicated; for commonly used materials such as steel, aluminum alloy, copper alloy, etc., the noise emitted by the sound source of the blanking process can be reduced Up to 4-9 decibels, which can effectively improve working conditions and purify the industrial production environment.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic diagram of the principle of the present invention. (a) is a schematic diagram of the first working step, (b) is a schematic diagram of the second working step, where [1] is the die, [2] is the punch, [3] is the push rod, [4] is the elastic member, h is the depth of the punch cutting into the material, and t is the thickness of the material.

Fig. 2 is a structural schematic diagram of the progressive die of the present invention, [1] is a die, [2] is a punch, [3] is a push rod, and [4] is an elastic member. There is a groove vacancy in the middle of the two stations.

The specific embodiment The present invention will be further illustrated by the following examples.

Example.

By the method of the present invention, with multiple materials, tests have been carried out on different equipment and different moulds.

The cutting depth of the punch in the first working step in the experiment is respectively:

Steel (SPCC, t=1.0) h=(0.78-0.82)t

Aluminum alloy (t=1.4) h=(0.76-0.80)t

Pure aluminum (L3, t=1.0) h=(0.70-0.72)t

Copper (H62, t=1.5) h=(0.70-0.78)t

It is measured that this progressive die two-step punching method can effectively reduce the punching noise, and its effect is shown in the table below.

Punching noise test test dB(A)

Claims (4)

1, a kind of progressive die two stage punching process, separate two work steps with waste material by punching press and workpiece and form, it is characterized in that the punching press work step is half stamping-out work step, make workpiece and waste material disconnected and not from, then workpiece and waste material are pushed into and push away station, workpiece is separated with waste material by charging ram.

2,, it is characterized in that the degree of depth of drift incision material is 0.7～0.8 of a material thickness according to the described blanking method of claim 1.

3,, it is characterized in that having laid an elastic component in the die bottom according to the described blanking method of claim 1.

4,, it is characterized in that in the middle of two work steps, increasing by one and the corresponding groove of blanking part size room according to the described blanking method of claim 1.