1. Cast iron base plate: Is it better to use cast iron or channel steel for the base of the pump? Is it possible to use both materials?

 

Both materials are available, the construction period is short, the quantity is small, the channel steel is used, the batch is large, and the time span is long.

 

cast iron base plates

 

2. Why is the base of the machine tool usually made of gray cast iron?

 

The thermal deformation of gray cast iron is much lower than other materials. For example, the contact surface of the base and the upper surface of the vertical car must be manually scraped. If it is cast steel or wrought iron, it cannot be manually scraped. Moreover, compared with cast iron, the deformation of steel is much larger, and it is not easy to process, because it deforms very large when it is heated, and there is no heat in the processing.

 

3. The large cast iron base of equipment is broken, which strength is higher for bonding or welding?

 

The fundamental solution to the crack at the screw hole of the cast iron base of the motor is welding. There are two types of welding, cold welding and hot welding. Generally, the maintenance of important cast iron equipment is cold welding. Hot welding is to preheat and heat the mother body. The post-welding heat preservation process is relatively cumbersome. Cold welding requires special cast iron electrodes that are common to various cast iron materials. They mainly need good crack resistance and damage the screw holes. The hole must be grooved. It is not possible to weld a little bit on the surface. It is difficult to achieve a certain welding strength.

 

Although the strength is higher than the strength of the general cast iron matrix and reaches the level of 48 kg, it is still very important to have a reasonable groove design and ensure sufficient occlusal area. , And then it needs to be machined after welding, the hardness after welding is about, it is completely possible to repair the screw hole crack opening and beveling, and secondary processing is formed. This is the correct solution.