Precision casting is the most familiar casting process for precision casting manufacturers. The precision casting process is mainly divided into five steps: wax pressing, shell making, pouring, post-processing and inspection. Among them, the steps of wax pressing include wax pressing and repairing. The three steps of wax and tree; shell making includes three steps of sand hanging, slurry hanging and air drying; post-processing includes sand blasting, shot blasting, correction and pickling, etc. The final inspection is There are four steps including wax inspection, initial inspection, intermediate inspection and finished product inspection.


Precision casting may be a bit unfamiliar to some small partners who don’t know much about casting, but for precision casting manufacturers, this is a very familiar process, because precision casting manufacturers mainly do this process, so precision casting What should I pay attention to in the casting process? Next, the editor will sort out the methods for determining the holding pressure, filling time and mold opening of precision casting. I hope these methods can bring some help to users who want to know about precision casting. .

1. After the pressure is held, the mold should be opened to take out the precision casting product. Then, the time from the end of injection to the opening of the die-casting mold is called the mold opening time. Opening the mold in sufficient time can make the precision casting have a certain strength in the mold. If the time of mold opening and ejection is inconsistent, it will cause deformation and cracking of the product. If the mold opening time is too short, It will also cause the casting to be demolded when the strength is relatively low, and this situation will also cause the casting to deform.

2. During die-casting, the liquid metal enters the die-casting mold cavity to fill the cavity. The time required during this period is called the filling time by precision casting manufacturers. The filling time depends on the size and complexity of the casting. Generally, the filling time of simple castings is very fast.


3. The length of the holding time depends on the material and wall thickness of the precision casting. If it is a casting with a high melting point, a large crystallization temperature range and a thick wall, the holding time will be longer; if it is crystallization For castings with a relatively small range and thinner wall thickness, the holding time will be shorter; when holding the pressure operation, the precision casting manufacturer must also control the holding time. If the holding time is insufficient, it is easy to cause Castings produce shrinkage defects, but if the holding time is too long, it will not play a very important role. On the contrary, it will cause the vertical die casting machine to remove the remaining material difficult, so controlling the holding time is also a very critical point.