Cause of Damage to Dustbin Mould

Posted: 12th August 2019 by xiu in Allgemein
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In die casting production, the most common form of damage to the Dustbin Mould(FURNITUREMOULD) is cracking and cracking. What are the main causes of mould damage?

1. Forging quality problems

Some dustbin mould produces cracks only when they are produced in a few hundred pieces, and the cracks develop rapidly. It is possible that only the outer dimensions are ensured during forging, and the loose defects such as dendrites, inclusions, shrinkage cavities, and bubbles in the steel are stretched and elongated along the processing method to form a streamline, and this streamline is for the future. The final quenching deformation, cracking, brittle fracture during use, and failure tendency have a great impact.

2. The cutting stress generated during final machining such as turning, milling, planing, etc., which can be eliminated by intermediate annealing.

3. The grinding stress is generated during the grinding of hardened steel. Friction heat is generated during grinding, and the softening layer and decarburization layer are generated, which reduces the thermal fatigue strength and easily leads to thermal cracking and early cracking. After the fine grinding of h13 steel, it can be heated to 510-570 ° C, and the thickness is maintained every 25 mm for one hour for stress relief annealing.

4. EDM produces stress. A white bright layer enriched with electrode elements and dielectric elements is produced on the surface of the dustbin mould, which is hard and brittle. This layer has cracks and stress. EDM should use a high frequency to minimize the white layer. It must be removed by polishing and tempered. The tempering is carried out at the tertiary tempering temperature.

5. Improper heat treatment will cause the dustbin mould to crack and be prematurely scrapped. In particular, only quenching and tempering, no quenching, and surface nitriding will occur, and surface cracking and cracking will occur after several thousand die casting.

6. The stress generated during the quenching of steel is the result of the superposition of thermal stress during cooling and the structural stress during phase change. Quenching stress is the cause of deformation and cracking. Solid must be tempered to eliminate stress.

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