What are the relevant knowledge in the injection mold
Teach you the next by vertical injection molding machine
A 1, cylinder temperature, temperature control: an injection molding process needs to control the temperature of the cylinder temperature, nozzle temperature and mould temperature, etc.
The first two main influence plastic plasticizing temperature and flow, and then a temperature is mainly influence plastic flow and cooling.
Each kind of plastic flow with different temperature, the same kind of plastic, due to different sources or trademark, the flow temperature and decomposition temperature is different, this is due to the different average molecular weight and molecular weight distribution, plastics in different types of vertical injection molding machine of plasticizing process is also different, so choose the cylinder temperature is not the same.
2, nozzle temperature, nozzle temperature is usually slightly below the cylinder of the highest temperature, this is to prevent the molten material in straight through the nozzle possible & quot;
Salivate appearance & quot;
Nozzle temperature also cannot too low, otherwise will form early setting of melting and the nozzle clogging, or because of the influence of early coagulate material into the cavity and the function of the finished product.
3, mold temperature, mold temperature inner function and apparent impact on the quality of the finished product.
Mold temperature is determined by plastic crystalline, and the structure, function of the scale of the finished product requirements, as well as other technical conditions (
Melting temperature, injection speed and injection pressure, molding cycle, etc. )
Second, the pressure control of injection molding process includes two kinds of plasticizing pressure and injection pressure, and directly affect the quality of plastic plasticizing and finished products.
1, the plasticizing pressure: (
USES screw injection machine, screw at the top of the molten material in the screw rotating back pressure is called the plasticizing, which is also called back pressure.
The size of the pressure can be found on the overflow valve to adjust the hydraulic system.
In an injection, the size of the plasticizing pressure is with the screw rotation speed is constant, then add the plasticizing pressure will progress the melt temperature, but will reduce the plasticizing rate.
In addition, add the plasticizing pressure often can make the temperature of the melt evenly, pigment mixing and discharge gas in the melt.
Usually operation, the plasticizing pressure shall be on the premise of guarantee the quality of the finished product fine, the lower the better, the specific values are vary with the varieties of the plastic, but usually rarely beyond 20 kg/cm2.
2, injection pressure: in the current production, almost all of the injection pressure of injection machine are in piston or screw at the top of plastic pressure (
By the oil pressure conversion)
Injection pressure in injection molding, the role of is, to overcome the flow resistance of plastic flowing from cylinder cavity, given the rate of molten material molding and compaction of molten material.
Three, molding cycle time required to complete an injection molding process, molding cycle, also known as the molding cycle.
It practices include the following sections: molding cycle: molding cycle directly affect the labor productivity and utilization rate of equipment.
In the process of production, therefore, should be on the premise of guarantee quality, try to shorten the molding cycle time of all.
In the molding cycle, with an injection time and cooling time is the most important, they have a decisive influence on the quality of finished products.
Mold filling time of injection time is directly on the mold filling rate, production mold filling time is about 3 - usually
The holding time of injection time is the cavity pressure time, plastic in the large proportion in the whole injection time, usually about 20 -
120 seconds (
Thick parts can be up to 5 ~ 10 minutes)
At the gate before freezing, melting the holding time of how many, have an effect on the finished dimension accuracy, if in the future, no effect.
The holding time are the most value, known it depends on the material temperature, mold temperature and the mainstream and the size of the gate.
If the scale of the mainstream way and gate and technical conditions are normal, usually is to get the finished product shrinkage rate fluctuations of the smallest stress value shall prevail.
Cooling time which determine the thickness of the finished products, plastic functions of thermal and crystallization, and mould temperature, etc.
The end of the cooling time should be in place to ensure that the finished product release when not cause changes for the principle, the cooling time generally between 30 ~ 120 seconds, the cooling time is too long is not necessary, not only reduce the production efficiency, the complex parts will also form the demoulding difficulty, even the forced demoulding will produce mold release stress.
Finally, other times of the vertical injection molding machine manufacturer is pointed out that the molding cycle and the production process is continuous and automatic and continuous and the degree of automation and so on.
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