• 2023-07-31
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Protection method of convex and concave die of hardware mold

Protection method of hardware mold:

The convex die is called a punch, and the concave die is called a concave die. Because a set of mold is divided into the upper die and the lower die, according to the different installation methods of the mold, some of the upper die is called the punch, the lower die is called the concave die, and some of the lower die is convex.

The punch refers to the punch or forming male fixed on the splint, and the concave die is the lower die knife edge or forming insert.

The mother die, also called the concave die, also called the lower die, is generally the lower die part. Male die, also called punch die, also called upper die, generally refers to the upper die part.

To really distinguish between the punch and the concave die, look at the surface to define the convex or concave.

The role of punch and die is the main part of hardware mold. The punch and die are processed into the desired shape, and the sheet that needs to be processed on the punch press is stamped into the mold hole of the concave die, or leaked down, or pushed out of the concave die. A required part is machined. The role of the concave die is to play two roles, one is the hole as a concave die, the shape as a punch, the simple part is the washer, a stamping out, of course, and it corresponds to the opposite side to have a punch, a concave die. Punch punch, die drop shape.

In the process of hardware mold design and production, there are always some small holes punching, in general, we only need the strength of the punch is enough, greater than 1.5 material thickness, you can carry out stamping mold production. However, for some small hole punching punch and die design, or need special attention. This tribe will not discuss the strength of the problem, just look at some commonly used to protect the punch and die methods.

When it comes to small hole punching, the impression is roughly less than the same time, and the material plate thickness corresponding to the φ1.0mm small hole is generally above and below 1.0mm. The actual situation is that for such a mold, if the guiding accuracy is not enough, such a mold will be very difficult to produce.

In the design of small holes or small special-shaped punches, we must pay attention to the protection and strengthening of the punch, but also pay attention to the gap of the mold template, the cleat should be loose, the stripper plate should be light and tight, and the concave die should be put into the gap according to the thickness of the material, the principle is that the concave die gap must be greater than the stripper gap.

In order to protect the strength and guiding accuracy of the punch during the design of the hardware mold, the punching punch adopts the strategy of guiding the front end of the punch through the discharge plate (punch guiding) to prevent punch damage. The stripper plate plays the role of guiding, strengthening, and stripping. At the same time, in order to strengthen the punch, the punch is generally used in 2 sections, that is, we often talk about A punch, the fixed plate uses a large-diameter punch, the stripper board uses a small hole consistent with the product requirements, and then the stripper back counterweight, or do two sections of the insert, one section is a large hole and one section is a small hole, so that the small hole section is guided, to ensure the punching accuracy of the punch, and improve the strength of the punch.

Generally, the gap between the fixed plate and the punch is 0.015mm unilateral, and the stripper plate is 0.005mm unilateral (thin material can be 0.035mm one-sided), and the gap between the die and the material thickness is generally 4% of the material thickness.

The key point of metal die design is to avoid blanking waste deposits in the die hole. The crux of the problem lies in the large blanking force required and the amount of conflicting impact pressure. Also pay attention to the strength of the die, the general die insert according to the stamping shape of 5mm or more amplification; Also pay attention to the anti-dork of the special-shaped parts, and design a large R Angle or small R Angle on the four R angles of the insert to prevent the direction assembly error.