How to prevent machine tool casting defects

A direct and effective method to prevent defects in machine tool castings: because the mud core is long and the stiffness is not enough, the mud core produces the bending deformation shown by the dotted line under the action of buoyancy of liquid metal. If it is changed to vertical pouring, the occurrence of the above adverse conditions can be avoided.

Due to the influence of many factors, machine tool castings often have defects such as pores, slag inclusion, cracks, pits and so on. The commonly used repair equipment is argon arc welding machine, resistance welding machine, cold welding machine and so on. Casting is a more economical blank forming method, which can show its economy for parts with complex shape. The welding repair range of cold welding is the process of repeated melting and accumulation of Φ 1.5-Φ 1.2mm welding patch. in the process of repairing large area defects, efficiency is a factor restricting its wide application.

 

The cold welding machine just overcomes the above shortcomings, and its advantages are mainly shown in that the heat affected area is small, the castings do not need preheating, cold welding repair at room temperature, so there is no deformation, edge biting and residual stress, no local annealing will occur, and the metal microstructure of the castings will not be changed. Casting is one of the basic processes of modern mechanical manufacturing industry.

Foundry production will produce dust, harmful gas and noise pollution to the environment, which is more serious than other mechanical manufacturing processes, and measures need to be taken to control it. Due to the influence of many factors, machine tool castings often have defects such as pores, slag inclusion, cracks, pits and so on.