Die casting machine hydraulic pump crack include mechanical stree and thermal stree, material properties and others.
The reasons why hydraulic pumps crack in die casting machines may involve many aspects, including mechanical stress, thermal stress, material properties, and operating conditions of the hydraulic system. The following are some specific reasons that may cause hydraulic pump cracks:
1. Hydraulic pump crack: Mechanical stress and thermal stress
Hydraulic pumps are subject to mechanical stress and thermal stress during operation. Mechanical stress mainly comes from friction and load changes between the moving parts of the hydraulic pump, while thermal stress is related to excessively high hydraulic oil temperature. If the hydraulic oil temperature exceeds 50°C, it will cause changes in the hydraulic oil characteristics, increase internal leakage of the cylinder and valve, and thus affect the stability of the working pressure. In addition, thermal stress will also cause compressive stress and tensile stress on the surface of the hydraulic pump. The repeated action of these stresses may lead to material fatigue and crack formation
2. Hydraulic pump crack reasons: Material properties
If the material of the hydraulic pump fails to meet the design requirements, it may also cause cracks. For example, poor sealing conditions of the pump shaft or insufficient material strength will increase the risk of cracks.
In addition, cracks in hydraulic pump castings are usually caused by the shrinkage stress of the metal exceeding the ultimate strength of the material during cooling and solidification.
3. Hydraulic pump crack reasons: Hydraulic system operating conditions
Excessive or low operating pressure in the hydraulic system may cause damage to the hydraulic pump. For example, reverse installation of the hydraulic pump or improper adjustment of the overflow valve will cause abnormal system pressure, which will cause excessive mechanical stress on the pump body. In addition, improper temperature control of the hydraulic system will also accelerate the aging of the seals and the deterioration of the hydraulic oil, further aggravating the damage to the pump body.
4.Heat Checking
During the die casting process, the mold surface experiences rapid temperature changes. This thermal shock can cause thermal stress on the mold surface, which can form cracks. This phenomenon is called “heat checking” and is characterized by tiny spider-web-like cracks on the mold surface.
While this is a problem specific to the mold, similar thermal stresses can also affect the structural integrity of hydraulic pumps.
5. Improper maintenance and operation
Improper maintenance or operating errors of hydraulic pumps may also cause cracks. For example, high hydraulic oil temperature, oil contamination or aging of seals will increase the risk of damage to the pump body. In addition, pressure fluctuations in the hydraulic system may also cause fatigue damage to the pump body.
Thus, there may be many reasons for cracks in the hydraulic pump in the die casting machine, including mechanical stress, thermal stress, material properties, operating conditions of the hydraulic system, and improper maintenance and operation. In order to prevent the occurrence of cracks, it is recommended to regularly check the pressure and temperature of the hydraulic system, ensure the quality and cleanliness of the hydraulic oil, and strictly follow the operating specifications for maintenance and use.
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