When purchasing, we must consider many problems. The first is the price, because in the market, the prices of the same products vary a lot. In addition to these, the important thing is that we should choose what is suitable for ourselves, so as to better help us work, So now let's know what factors to consider when buying die casting machine?
1. Injection force of die casting machine
It refers to the injection force before pressurization of the die casting machine. Generally, the injection force after pressurization is given in the parameter table of die casting machine provided by the manufacturer. The injection force before pressurization is insufficient, which can not overcome the resistance when the liquid metal passes through the inner gate (inner gate), which will seriously affect the forming of the casting, let alone ensure the internal quality of the casting. Therefore, before buying the die casting machine, you should ask about the injection force before pressurization, or find out the diameter of the injection cylinder. The buyer should calculate whether the injection force is enough or not.
2. Start time of pressurization of die casting machine
It refers to the time from giving the pressurization command to starting the pressurization, that is, the time interval from the stop of the injection punch (air injection) to the start of pressurization. This time interval should be less than 0.02 s, the shorter the better. If the time is too long, the metal liquid at the inner gate (inner gate) has solidified, and the pressurization is invalid.
3. Pressure building time of die casting machine
That is, the time from the start of pressurization to the increase of pressurization pressure value should also be less than {{0}}.02s, otherwise the pressurization pressure of the casting in the secondary filling (the punch extrudes liquid metal into the cavity at high pressure and low speed, also known as pressurization) is not large enough, and the pressure rises to 90 percent only after solidification, and the pressurization effect will be reduced, or even there will be no pressurization. Generally, the sum of pressurization start time and pressure build-up time is the pressurization time, which should be less than 0.04s. This parameter is particularly important for thin inner sprue (inner gate), pressure resistant and stressed die castings.
