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Iron powder is displayed when trimming the punching die

Posted by: Fymicohuang 2021-10-06 Comments Off on Iron powder is displayed when trimming the punching die

When trimming stamping dies, iron scrap is generally present. Especially around the lower scrap knives. Iron shavings not only have a serious impact on product quality and mold appearance cleanliness, but also reduce production efficiency.

Analysis shows that this is not perpendicular to the trimmed edge. The part does not fit the mold surface. Secondary cutting of the cutting edge; unreasonable cutting edge clearance. Poor edge finish; Secondary cutting of scrap knives; State-of-the-art hardness is not enough. The cutting edge is too deep. The design of the mold process is irrational. The control measures for this are as follows.

1. Scrap knives generate scrap iron

The production of iron powder at the scrap knife site is mainly caused by the mold process.

Measures taken:

The shape of the cutting edge of the upper mold cutting waste was changed by 10 mm to create the shape of the cutting edge. Then, the lower end of the lower mold waste is milled hollow.

Stamping Precision stamping after die trimming

2. The structure of the plate is out of shape, and the gap between the cutting edges is impossible.

The measures taken against irregular plate structure and unreasonable cutting edge clearance are as follows:
Draw the plate using OP10, buckle the surface of each part of the trimming mold, and at the same time adjust the gap between the upper and lower edges to adjust the depth of ingestion.

3, edge trimming

There are three ways to improve cross-section quality and cutting edge life when trimming edges:、

  • 1) The rounded part of the trimming edge should be 3mm larger than the rounded corner of the trimming piece. This will allow the trimming edge to switch to 1-3mm for a slow transition when the top and bottom molds are completely closed.
  • 2) The top edge of the trimming edge of the upper die is at an angle of 10 ° with the edge of the trimming piece.
  • 3) Attach the guide block as much as possible so that no lateral force is applied to the cutting edge.

4. Mold process design

  • 1) Use two or more trimmings. The advantages of using this measure are:
    Under reasonable cutting edge clearance conditions, no burrs or trimming scraps are generated, which is convenient for waste removal, product quality is stable and production efficiency is high.
  • 2) The entire side is trimmed. The advantages of adopting this method are that if the clearance of the cutting edge is reasonable, burrs and trimmed iron pieces are not generated, it is convenient to remove waste, the quality of the product is stable, and the production efficiency is high. That is.
  • 3) Trim in the central separation area of ​​the two parts. Originally, in the production process, the board was pressed by the cooperation of the upper die press core and the lower die punch, and the cutting edges of the upper and lower dies cooperated to cut out the waste. Forced breakthrough cutting of the upper mold breakthrough knife and coordinated cutting of the convex and concave trimming edges on both sides are converted to intermediate waste to achieve final waste separation. In this way, the disposal space for the lower mold waste is wide, and the waste is easily discharged.

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