Parts and Functions of Stamping Die You Should Know

1. Upper and lower support plates, upper and lower pad feet, upper and lower mold bases:

It is generally made of “soft materials” such as A3 and Q235, which can support the whole mold, facilitate mold erection and blanking.

2. Upper and lower formwork:

The upper and lower formworks are used to fix the knife edge, the block, the sub and the ejector pin.

External positioning, internal positioning, floating guide pin, dual-purpose pin, guide plate and floating block are also fixed on the lower formwork.

The hardness of the lower formwork must be about HRC58 ~ 62. Too low hardness will affect the blanking quality.

The thickness is generally 25-40mm.

Some knife edges are directly cut on the formwork, that is, the knife edge is directly dug on the formwork.

If the knife edge is missing, broken, worn or has rough edges, it is difficult to repair the formwork.

Another method is to dig in the block, that is, to dig the knife edge on a block (this block is customarily called “lower mold knife edge”), and then install the lower mold knife edge into the lower template.

The height should be as high as the lower formwork, and the error should be within ±1-2, preferably within ±0 and 0.05mm, which can be achieved by the grinder or fitter.

Too many errors will make a mark on the product.

3. Upper and lower base plates:

The backing plate is generally made of Cr12.

According to needs, the thickness of the upper and lower backing plates of each set of dies is different.

Depending on the blanking force, if there are fewer holes punched, the upper and lower backing plates can be made thinner by 8 ~ 10mm.

If there are more punching holes, it should be made thicker, generally about 17 ~ 20mm.

The lower base plate is mainly provided with blanking holes, spring holes, screw holes, guide pillar holes, etc.

4. Upper and lower clamping plates:

The upper and lower clamping plates are mainly used to fix terrace die, plunger chip and guide pillar, generally 17-20mm.

Generally, the material hardness of the clamping plate of the stamping die does not need to be particularly high.

Generally, soft materials can be used, but too soft can not be used.

It may pull the hanging table of the punch directly into the clamping plate and damage the clamping plate.

Therefore, when designing a stamping die, we should consider the structure of the die, the material selection of the die, the tonnage of the selected punch, the size of the blanking gap, etc.

From the blanking process of the workpiece we want, so as to make the burr of the processed workpiece smaller and extend the service life of the die.

5. Stopper plate and stripper plate:

Stopper plate

Cr12 can be used for the stopper plate, but hard materials such as Cr12MoV must be used for the stripper plate.

The stopper plate and the stripper plate are locked together through M6 or M8 screws.

There are mainly some through holes on the stripper plate, such as punch through holes and guide post through holes.

Stripper plate

The stripper plate mainly plays the roles of stripper, pressing and guiding punch.

Generally, we use stripper to guide terrace die, plunger chip and guide pillar.

In the production of aluminum materials, because aluminum chips are easy to jump into the stripper plate, roughen the punch, block the punch, break the punch, pull out the stripper plate, etc.,

Stopper plate must be used to guide plunger chip, and one side of the stripper plate should be appropriately enlarged by 10-20 pieces;

Or the stripper plate is made into two sections. The upper section is used for guiding and the lower section is also used for unilateral amplification of 10-20 strips.

The thickness of the stopper plate is generally 8-17 mm, which is also based on the number of punching holes and the magnitude of the force to be received;

The stripper plate is generally 20 ~ 25mm thick.

6. Die, punch

Also known as punch or knife, it is used to punch, cut, pierce and stretch excess materials.

Such as: stretching punch, bending punch, slide insert, salad punch, bump punch, sprouting punch, riveting punch of riveting die, etc.

The material of die and punch need high hardness.

The commonly used die and punch materials are: Cr12Mo1V1, Cr12MoV, Skd-51, Skd-11, W6Mo5Cr4V2 (tungsten steel), etc.

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