Hardware mold convex and concave mold protection method:
The protruding die is called a punch, and the concave die is called a concave die. Because a set of molds is divided into upper mold and lower mold, depending on the installation method of the mold, some upper molds are protruded, which is called a punch, and the lower mold is concave, which is called a concave mold. protruding.
The punch of the metal mold refers to the punch or forming male fixed on the splint, and the female die is the knife edge of the lower die or the forming insert.
The female mold, also called the concave mold, is also called the lower mold, which is generally the lower mold part. Male mold, also called punch, also called upper mold, generally refers to the upper mold part.
To really distinguish between punch and die, it depends on which surface is defined to see whether it is convex or concave.
The role of punch and die is the main part of metal mold. The punch and die are processed into the desired shape, and the sheet to be processed on the punch is punched into the hole of the die through the punch, or leaked, or pushed out from the die. A required part is machined. The role of the punch and die is to play two roles. One is that the hole is used as a die, and the shape is used as a punch. The simple part is a gasket, which is punched out at one time. Of course, corresponding to it, there must be a punch and a concave on the opposite side. mold. Punching punching, concave die drop shape.
In the process of hardware mold design and production, there will always be some small hole punching. Generally speaking, as long as the strength of the punch is sufficient and the thickness of the material is greater than 1.5, the stamping die can be produced. However, for some small holes The design of punching punches and punches still needs special attention. Here, the tribe does not discuss the issue of strength, but only takes a look at some commonly used methods for protecting punches and punches.
When it comes to small-diameter punching, the impression is generally less than the same time. The thickness of the material corresponding to the φ1.0mm small-diameter hole is generally around 1.0mm. The actual situation is that for such a mold, if the guiding accuracy is not enough, such a mold, It will be very bad to produce.
When designing small holes or small special-shaped punches, we must pay attention to the protection and strengthening of the punches, and also pay attention to the gap between the die templates. The principle is that the die gap must be larger than the stripper gap.
In order to protect the strength and guiding accuracy of the punch in the design of the metal mold, the punching punch adopts a countermeasure to guide the front end of the punch (punch guide) through the stripper plate to prevent the punch from being damaged. There is also the effect of stripping. At the same time, in order to strengthen the punch, the punch generally adopts 2 sections, that is, the A punch we often talk about. The fixed plate adopts a large-diameter punch, and the stripper plate adopts a small hole consistent with the product requirements, and then the back of the stripper plate is countersunk. , or make two inserts, one is a large hole and the other is a small hole, so that the small hole section is a guide, which ensures the punching accuracy of the punch and improves the strength of the punch.
Generally, the gap between the fixed plate and the punch is 0.015mm on one side, and the stripping plate is 0.005mm on one side (the thin material can be 0.035mm on one side), and the gap between the die and the die is set according to the material thickness, which is generally 4% of the material thickness.
The main point of the die design of the metal die is to avoid the accumulation of blanking waste in the die hole. The crux of the problem is that the required blanking force is too large, and at the same time there are too many conflicting punching forces. Also pay attention to the die The strength of the die insert is generally enlarged by more than 5mm on one side of the stamping shape; also pay attention to the foolproofness of the special-shaped part. Design a large R angle or a small R angle on the 4 R corners of the insert to prevent the wrong direction assembly.
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