Abrasive processing and manufacturing, seems to be just die-casting mold molding so simple, but there are many problems in the actual production process. In the process of die-casting production, if you do not pay attention to the details, it will inevitably cause some defects in the mold, such as: cracks, cracks, blank forging quality problems, these problems will seriously affect the specific use of the mold, so we need to better avoid. In order to learn more about Jinan die-casting production, die-casting mold processing manufacturing common problems.
1. The quality problem of blank forging. Some of the molds produced only a few hundred pieces of cracks, and cracks developed rapidly. It is possible that only the external dimension is ensured during forging, and the loose defects such as dendritic crystal, carbide inclusion, shrinkage cavity and bubble in the steel are extended and stretched along the processing method to form streamline, which has great influence on the final quenching deformation, cracking, brittleness and failure tendency in use.
2. The cutting stress in turning, milling and planing can be eliminated by intermediate annealing.
3. Grinding stress is produced during grinding of quenched steel, friction heat is generated during grinding, softening layer and decarburization layer are produced, which reduce thermal fatigue strength and easily lead to hot cracking and early cracking. After finishing grinding, the H13 steel can be heated to 510-570 ℃ for one hour at a thickness of 25 mm.
4. Stress is produced by EDM. There is a layer of white bright layer on the surface of the mold, which is rich in electrode elements and dielectric elements. It is hard and brittle. This layer itself will have cracks and stress. High frequency should be used in EDM to reduce the white layer to the minimum. Polishing method must be used to remove and temper. Tempering should be carried out at the third tempering temperature.
The above are the common problems in the processing and manufacturing of die casting dies, as well as the corresponding methods. It is also very important to pay attention to these problems in the processing and manufacturing of die casting dies, because only in this way can cracks, cracks, quality problems of blank forging be avoided, and the quality of die casting dies with qualified quality can be produced.
The above is about die-casting mold processing and manufacturing common problems related to the introduction, hope to help you, want to learn more, welcome to click Jinan mold http://www.jnhjgs.cn Website.