Knowledge Summary of Common Problems in Precision Casting Technology


Industrial technology mainly involves smelting, casting, forging, welding, heat treatment, physical and chemical testing, etc., supplemented by knowledge of mechanical processing and computer design. Most people now know that stainless steel precision casting, also known as investment casting wax film casting, the process is widely applicable to various castings, but in the casting process will inevitably encounter a series of problems.


The first problem of precision casting: the solution of the hammer jamming: in production, often measure the temperature to avoid excessive temperature of the hammer head and barrel; select high-quality impurity-free alloy materials to avoid impurities sticking to the hammer head.


The second problem of precision casting: the injection gun is stuck in the gooseneck: the device is at room temperature, try to turn the hammer, if it can’t turn, then replace the barrel and remove the hammer. If you want to quickly solve the stuck problem, it is best to replace the material tank.


The third problem of precision casting is that dozens of molds are impossible. It will take a few minutes to continue punching. See if there are any bright spots above your head. If all parts are gray, the nozzle is clogged. Properly increase the nozzle temperature, reduce the nozzle knocking time by 0.1 to 0.2 seconds, and close the fixed mold cooling water slightly.


The fourth problem of precision casting: solving the problem of easy cracking of thin-walled die-casting products: this problem may be due to material problems or poor mold settings or improper selection of process parameters. Try to control the proportion of scrap products not to exceed 30%. If it is too long, and the wall thickness is about 3 seconds per millimeter, the ejection delay is not long, generally 0.5-2 seconds.


The fifth problem of precision casting: the material is too hard, and the tool is easy to wear.

The sixth problem of precision casting: black spots when polishing aluminum alloy die casting solutions: reduce the concentration of spraying agent, change to other spraying agent, or increase the blowing time after spraying.


The seventh problem of precision casting: metal splash solution in the die casting process: reinstall the mold; increase the clamping force and adjust the die casting machine to keep the moving fixed plate parallel; increase the support plate on the moving mold to improve the mold Stiffness.

The eighth problem of precision casting: flow pattern generation solution after die-casting anodizing: spraying, uneven walking of injection oil, inappropriate high-speed switching position, or excessive copper ion content in the oxidation tank will cause flow pattern problems, so spraying And injection oil can be evenly dispersed, not concentrated in local areas, or set high-speed switch position to reduce shortages. Casting phenomenon.


The ninth problem of precision casting: the solution of the die-casting mold adhesive: check whether the mold temperature is normal, reduce the casting temperature and mold temperature of the alloy liquid properly; check whether the release agent ratio is abnormal, try to replace the release agent; debug the surface of the sprayed part , And carefully polish the nitride mold to prevent damage. The surface nitriding layer forms more throwing sticking phenomenon; improve the design structure of the casting system to avoid the continuous corrosion of the cavity wall or the core by the alloy liquid; modify the mold cooling system; adjust the die casting process parameters, appropriately reduce the injection speed, shorten the double Speed ​​travel.

Post time: May-15-2020
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