2019-07-10 10:13:59

Bucket Teeth Casting Forming mechanism

According to the forming principle of squeeze casting, the forming of bucket teeth is a process of metal liquid flowing from chamber to cavity under pressure. The dynamic force of the flow is the pressure acting on the liquid metal. The resistance is the internal viscous force of the liquid metal, the friction force between the liquid metal and the cavity wall, and the back pressure of the gas in the bucket tooth cavity.

 

When the power is greater than the resistance, the liquid metal can flow, otherwise the liquid metal will stop flowing. If the difference between power and resistance is called effective filling pressure, as long as the effective filling pressure is not zero, the liquid metal will flow and fill.

 

On the contrary, when the effective filling pressure is equal to zero, the liquid metal will stop flowing and the filling process will stop, forming the defect of bucket teeth. The effective filling pressure can be deduced according to rheological mechanics and gas law.

 

According to the rheological mechanics of the alloy, the liquid metal near the liquidus belongs to non-Newtonian fluid, and there exists a critical shear stress. Only when the stress generated by external pressure in the liquid metal is greater than the critical shear stress, the liquid metal can flow.

 

In addition, the die of bucket teeth squeeze casting is a metal mould, and the gas in the cavity is mainly discharged by parting surface and assembly clearance. If the discharge is not smooth, with the filling of liquid metal, the temperature of the gas in the cavity increases, but the volume is compressed, which leads to the pressure rising continuously. This pressure will offset the filling pressure, and when the two balance, the liquid metal will not be able to continue filling the cavity.

 

  Huangzuan Machinery established in 2008, is a specialized manufacturer of bucket teeth, bucket adaptor and side cutter which is used Caterpillar, Komatsu, Hyundai, Daewoo, Kobelco, Hensley, Liugong, Hitachi, XCMG, XGMA, Volvo, Esco, JCB .etc.

 With production facilities covering an area of 18136 square meters and staff of 100, our annual processing capability equals approximately 12,000 metric tons. we currently have the technology of lost wax casting, precoated sand casting, resin sand casting, have the advanced instrument such as spectromaxx, Brinell hardness tester, universal testing machine, metalloscope.