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What kinds of hardware molds can be divided into stamping methods?

Essai Industries Co.,Ltd | Updated: Mar 30, 2018

1. Blanking die classification


According to the nature of the process can be divided into: blanking mold, punching die, cut off die, cut tongue die, cut off die, trim die, fine die, and so on.


According to the degree of combination of processes: can be divided into single-step mode, compound mode, progressive mode (continuous mode or jump mode)


According to whether or not there is no guidance: it can be a non-guided open test die and guided guide die, guided pillar die


According to the degree of automation: can be divided into manual mode, semi-automatic mode, automatic mode.


Single process blanking die


Blanking die


A: Non-guided blanking die: The advantage of non-guided die is that it has a simple structure, a short manufacturing cycle, a low cost, and a certain degree of versatility. The disadvantage is convexity. The uniformity of the die gap can only be guaranteed by the adjustment during the die mounting and the guide accuracy of the punch slider. The accuracy is not high, the die adjustment is not convenient, the parts are easily damaged, the die life is short, and the productivity is short. At the end, the use is less safe and the workpiece flatness is not high. Therefore, it is not suitable for punching of thin materials and plastic materials.


B: Guide plate blanking die The use of H7/h6 fit between the guide plate and the punch makes it possible to guide the punch. At the same time, it also serves as a fixed stripper plate. The advantages are: high precision, long service life, easy installation and commissioning, and safe use. The disadvantage is that the guide plate is difficult to manufacture, the punch cannot leave the guide plate, and a press with a relatively small stroke is required.


C: Column-type blanking die The upper and lower dies of the pillar-type die are guided by guide pillars and guide bushes to ensure their correct positions. Therefore, the gaps between convex and concave dies are uniform, the quality of the parts is relatively high, and the die life is relatively long. The guide sleeves are cylindrical, easy to process than guides, and easy to install and maintain. The disadvantage is that the manufacturing cost is relatively high.


Punching die


A: The clearance between the general punching die plate and the stripper plate should be less than the hole depth of the stripper plate. This can ensure that the force that the stripper plate presses when pressing is completely transmitted by the pressure rod, and the punch is protected.


B: side punching die The biggest feature of this kind of die is to rely on the oblique pin to change the vertical movement of the press slider into the horizontal movement of the slider, so as to complete the side punching, and the working angle of the oblique pin is 40-50 degrees. , Punching power to take a small value, long work trips, take a large value.


C: The hole punching die The punching part of the die is protected by a movable protective cover and a fan-shaped protective block, so that the punch is uninterruptedly guided in addition to the material part, thereby improving the punch rigidity and preventing the punch from bending and breaking. Possible.


3. The trimming die cuts the extra edge of the flanged deep part out of the progressive die in each stroke of the press slider, in the same position of the same die, and simultaneously completes two or more different stampings The die of the process is called progressive die (also called jumping mode or continuous die). The use of progressive die production can reduce the number of molds and equipment, improve production efficiency, and is easy to achieve automation. The disadvantage is that the manufacturing process is more complicated than the single process mold, and the cost is also high. Using the progressive die must solve the problem of accurate positioning of the strips.


1. For the first time punching of the advancement die for retaining the material pin and the guide pin, the first use of the blocker pin is used for the first time, and then the rougher positioning is performed with the fixed block pin. The pilot pin is installed on the punch for the final accurate locating. When the shape of the part is not suitable for positioning with the guide pin, the punching process hole can be used to guide the positive material on the seasoning scrap. The diameter of the lead cutting should be larger than 2-5 MM to avoid breaking. When the material thickness is less than 0.5MM and the narrow long punches are not suitable for positioning with the guide pin, then the side edge distance is used.


2. Side-half-edge progressive die. Use the side edge instead of the stop pin to control the feeding distance of the strip. The length of the side edge section is equal to one step S, which has the advantages of accurate positioning, high production efficiency, and convenient operation. The disadvantage is that the material consumption and punching force increase. When the material thickness is thin and effective, the material can be discharged in an elastic manner to ensure the smoothness of the workpiece.


3. Design of progressive die layout


Reasonable use of materials should be considered as much as possible


Should consider the accuracy of parts


Should consider the ease of manufacturing


Should consider mold strength and life


Should consider the size of the mold size


Consider the requirements of part forming law


Compound mold structure analysis


In each stroke of the press slider, a die that simultaneously completes two or more different punching operations at the same position of the same auxiliary die is called a compound die. Its structural feature is that it has a work part that can act as a punch and a die. According to its installed position, the composite mold is further divided into flip/sliding composite molds.


1. Flip-chip compound mold When the punch and die is installed in the lower mold part, it is called flip-up compound mold. It adopts a steel topping device, so the flatness of the parts will be relatively low. When blanking, the strips cannot be pressed, so the accuracy of the parts will be relatively low, so it is only suitable for precision and flatness between pairs. It is required to be used relatively low, but its structure is relatively simple and it is more widely used in practice.


2. The male and female molds of the upright composite mold upright composite mold are installed in the upper mold part. The elastic unloading device of the product is ejected from the lower mold part. The upper mold adopts an elastic unloading device, so the accuracy and flatness of the product are relatively. It is relatively high, but the structure of the mold is relatively complicated for flipping. The main advantage of the composite mold is its compact structure, high precision and flatness of the ejected parts. However, the structure is complicated, manufacturing is difficult and the cost is high. Because the shape of the punch and die edge is completely consistent with the workpiece, if the hole margin or hole spacing of the part is too small, the strength of the punch and die is poor.


Single-step mold Progressive mold Compound mold Non-guided oriented parts Low precision General up to IT13-IT18 Up to IT9-IT8 Part size, size, size Large, medium, and small dimensions Complex and small parts are constrained by the structure and strength of the mold Lower production efficiency, lower maximum, general mold manufacturing workload and cost is lower than non-guided, slightly higher than the simple punching of complex parts than the complex mold bottom punching complex parts than the safety of continuous mold bottom operation is not safe, need to take Security measures are safer and insecure. Security measures need to be taken. Automation may not be used. Optimal use.