The reason why the temperature rise of the injection molding machine is too high and the treatment method

The reason why the temperature of the injection molding machine is too high

(1) The fuel tank volume is too small, the heat dissipation area is insufficient, and the cooling device has a small capacity.

(2) The dosing pump oil supply system that selects the pump capacity according to the fast-forward speed, during operation, most of the excess flow will overflow from the overflow valve under high pressure and generate heat.

(3) The unloading circuit in the system is faulty or the unloading circuit is not set. When the pump stops working, the oil pump cannot be unloaded. The entire flow of the pump overflows under high pressure, causing overflow loss and heating, resulting in temperature rise.

(4) The system piping is too long and too long, too much bending, partial pressure loss and large pressure loss along the path.

(5) The component accuracy is insufficient and the assembly quality is poor, and the mechanical friction loss between the relative movements is large.

(6) The matching clearance of the fittings is too small, or the wear is too large, resulting in excessive clearance, and the internal and external leakage is large, resulting in volume loss, such as the volumetric efficiency of the pump is reduced, and the temperature rise is fast.

(7) The hydraulic system working pressure is adjusted much higher than the actual needs. Sometimes it is necessary to increase the pressure to work because the seal is too tight, or because the seal is damaged or the leak is increased.

(8) The temperature of the gas and working environment is high, causing the oil temperature to rise.

(9) Selecting the viscosity of the oil is improper, the viscosity is large, the viscous resistance is large, and the viscosity is too small, the leakage is increased, and both cases can cause the heat rise.

Processing method for excessive temperature rise of injection molding machine

(1) According to different load requirements, always check and adjust the pressure of the relief valve to make it just right.

(2) Reasonable selection of hydraulic oil, especially oil viscosity, when conditions permit, try to use a lower viscosity to reduce viscosity friction loss.

(3) Improve the lubrication condition of moving parts to reduce friction loss, which is beneficial to reduce working load and reduce heat generation.

(4) Improve the assembly quality and accuracy of the hydraulic components and hydraulic system, strictly control the matching clearance of the fittings and improve the lubrication conditions. The sealing material with low friction coefficient and the improved sealing structure are used to reduce the starting force of the hydraulic cylinder as much as possible to reduce the heat generated by the mechanical friction loss.

(5) Add a cooling device if necessary.