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The broken reason and suggestion of ejectors of die casting molds
2016-11-21 08:04:38


The broken reason and suggestion of ejectors of die casting molds


1. High temperature of production environment.

2. Whether dimensional accuracy can meet the usage requirements.

3. Stress conentration

It is easy for the shaft to form a stress concentration at a portion where the diameter changes abruptly when the step is processed, so it's easy to be carcked or broken when it meet an external (espeically a radial force) fore during using.

4. Heat treatment

Most ejectors will be heat-treated in the process of manufacture, without tempering after quenching or short tempering time will both lead the quality defects e.g. excessive residual stress.

5. check the standard ability of the nitriding process, high carburizing temperature would lead the material failure when it during tempering and even the annealing process.

6. Try to avoid the radial force to the ejectors during its use as possible as can

7. Using transition fillets or increased stress relief groove for the parts of variable diameter when you design molds.

8. Check the size and roughness of the hole before the ejectors be put into. If the ejector hole is loose, then it will be fed materials easily, that will broken the ejector. If the hole is tight, then he ejector will get a burned up. So we need a good compatibility between the hole and ejector.

9. Daily maintenance and technical adjustment of Molds

It's better to use lubricating oil while during each loading mode time, one of the daily maintenace is mainly paint lubricating oil or thimble oil. And then you need to paint lubricating oil per 3 to 5 days to maintain a good work condition. Meanwhile it’s better to use high temperature paste for angle ejector and ejector (a thin film is enough).

10. Recommend materials : Toolox44, SKD11, 1.2379, D2, SKD61, 1.2344, H13 tool steels.



Alta Special Steel obtained great advantage on grades SKD11/D2/1.2379 and SKD61/1.2344/H13 tool steel rounds, flats, plates and squares.


Welcome your inquiries at sales@altaspecialsteel.com , export@altaspecialsteel.com


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