Why is the hardness of punch and die different?

If it's a die! The die hardness is high! Punch hardness bottom point!! The general die is difficult to dismantle!! The punch is good to dismantle! It doesn't matter if the punch hardness is low!

The die belongs to the knife edge!! Be wear-resistant!! It doesn't matter if the punch is worn to a point!! It still works!! There are many more factors!! I can't say it so comprehensively.

If it is a plastic mold! The hardness of the concave and convex die is just as high!!

It's not the same.

But now the ordinary mold is the same.

If it is a general single die, then it is generally mostly made of CR material, and generally 60HRC continuous die material, what D2 will be used

SHD11 Ah.

The stamping general material can be more competent, and the hardness is the same.

In some special molds, such as terminal molds.

The concave and convex die is generated according to the parting surface, as long as there is no problem with the parting surface, there will be no problem with the concave and convex die.

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The calculation formula of stamping die punch matching over-citation.

Summary. The difference in hardness between punches and dies is mainly due to their different cooling rates during heat treatment. Specifically, due to the particularity of its structure, the die cools quickly during heat treatment, and it is easy to form a higher hardness.

On the other hand, due to the peculiarity of its shape, the cooling rate of the punch is relatively slow, so it is difficult to form the same high hardness as the die. In addition, punches and dies are used in different ways, punches are usually used for pressing, extrusion, and other processing of workpieces, while punches are used for stretching, stamping, and other processing of workpieces. In use, the surface of the punch is susceptible to the wear and impact of the workpiece, resulting in a decrease in surface hardness, whereas the die is comparatively less subject to wear and impact, so the hardness is comparatively higher.

In conclusion, the difference in hardness between punches and dies is mainly due to the difference in their cooling rate during heat treatment and the difference in the way they are used. For specific application scenarios, you need to select and process them based on the actual situation.

The difference in hardness between punches and dies is mainly due to the difference in their cooling rate during heat treatment. Specifically, due to the particularity of its structure, the die cools quickly during heat treatment, and it is easy to form a higher hardness. However, due to the particularity of its shape, the cooling rate of the punch is relatively slow, so it is difficult to form the same high hardness as the die after dusting.

In addition, punches and dies are used in different ways, punches are usually used for pressing, extrusion, and other processing of workpieces, while punches are used for stretching, stamping, and other processing of workpieces. In use, the surface of the punch is susceptible to the wear and impact of the workpiece, resulting in a decrease in surface hardness, whereas the die is comparatively less subject to wear and impact, so the hardness is comparatively higher. In short, the difference in hardness between punches and dies is mainly due to the difference in their cooling rates during heat treatment and the difference in the way they are used.

For specific application scenarios, you need to select and process them based on the actual situation.

Hello dear, glad to answer for you. Heat treatment hardening is to change the microstructure of steel by controlling the heating, heat preservation and quenching process of steel to achieve the effect of increasing the hardness and strength of steel. In mold manufacturing, there may be differences in the hardness of punch and die heat treatment hardening, which is mainly determined by the following factors:

1.Punches and dies have different surface characteristics, such as shape, size, thickness, etc., and these factors may affect the effectiveness of the quenching process. 2.

The shape of punches and dies determines their different cooling rates, resulting in differences in hardness. In general, punches have a faster cooling rate and are therefore prone to cooling stresses, resulting in relatively low hardness after heat treatment. 3.

Different factors such as solid solubility, element composition and non-metallic inclusions of different die steel materials will also affect the effect of the quenching process, and then affect the hardness after heat treatment. 4.There may also be the difference in the quenching medium, some workpieces will use some special media when quenching, and the soaking time is different, which will also affect the hardness of the lug rod.

Therefore, the heat treatment hardness of punch and die is different, which may be caused by the combined action of a variety of factors, and the situation of macro body needs to be analyzed. In mold manufacturing, it is necessary to precisely control the heat treatment process parameters according to the shape, material properties and other factors of the specific mold to obtain the ideal hardness and strength.

There are national standards for the thickness of the fixed plate and the die of the cold stamping die, and you can consult the design manual of the relevant die.

The matching gap between punch and die should generally be determined according to the material and thickness of the stamped material, as well as the specific requirements of the design for the product.

The cross-sectional quality of the whole punching part includes collapsed corner zone, bright zone, fracture zone and burr. Generally speaking, burrs are inevitable and can only be reduced, mainly by adjusting the convex and concave die gap to control the size of the burr.

Extrusion is the process of placing a cake blank (usually heated) into a die, which extrudes it into a workpiece. During the extrusion process, the cake material moves in the gap between the punch and the die. According to the different flow directions of metal and punch, they can be divided into forward extrusion, reverse extrusion, composite extrusion and radial extrusion.

The manufacture of the MacPro can be seen to be reverse extrusion, i.e. the metal flows in the opposite direction to the punch.

About the determination of the thickness of punches and dies:

First of all, the choice of punch thickness depends on the thickness and strength of the material.

1, If it is a simple blanking punching type of pin, the thickness should be considered at the same time, the thickness of the maximum contour point from the outside of the repentance, taking the soft material (08AL) as an example, the thickness of the material is, according to the empirical thickness is not less than 30mm, the thicker the material, the stronger the strength and the greater the thickness. In actual work, it is generally about 50mm.

2. For large molds, the minimum thickness of the working part shall not be less than 40mm, if the block structure is adopted, the thickness of the bottom plate (support seat) part shall not be thinner than 40mm, of course, the position and thickness of the vertical ribs should be considered for large molds.

Determination of mold clearance:

Generally, the blanking punching die (punching class) punch gap selection should be based on the thickness of the material, and 5%-8% of the material thickness is generally selected as the unilateral clearance of the punch according to experience.

The above is a little personal experience, if there is something wrong, please advise.

The thickness of the stamping punch is equal to the thickness of the upper clamp plate + the thickness of the baffle plate + the thickness of the upper plate + the thickness of the material + 5 mm. (Normal blank 65-70mm thick).

The thickness of the stamping die is normal to take 5 times the thickness of the material, if it is less than 20mm thick, take 20mm thick.