Rust is a common problem in the production of casting machinery parts, and its ejector pin and barrel are more prone to rust. If rust is not treated when the top pin is found, its service life will quickly wear down and become less durable. When producing plastic molds, a large part of the reason for the rust of the ejector pin is due to water injection. It is impossible to stop the machine and turn off the water. Improper operation can easily cause the ejector pin to rust.

The correct method introduced by casting machinery manufacturers should be to turn off the water and shut down the machine, so it can effectively prevent rust. If the ejector pin is used correctly, it will be difficult to rust. When the ejector pin is no longer in use, measures should be taken to protect it and rust proof oil or machine oil should be used for rust prevention treatment.

If the top pin is rusted and there is only a small amount of rust, it can be removed by copper wire or grinding stone processing. However, if the rust is severe, replace the ejector pin in a timely manner to keep the mold in good working condition. Different processing methods and processes such as cold processing (cutting, polishing, grinding) and hot processing (forging, casting, welding) used in mold manufacturing should be selected with appropriate materials.

There should be differences in material selection between manual and mechanical methods of mold manufacturing. Manual mold manufacturing has high costs, and better materials should be selected as much as possible. Cold work molds are molds used for pressure processing or other processing of materials at room temperature. They are mainly divided into punching molds, drawing and forming molds, cold heading molds, and cold extrusion molds.

Whether the processed product is made of metal or non-metal materials varies greatly depending on the processing of different raw materials, including deformation resistance and working temperature. The working conditions of the mold also differ greatly, and the selected mold material is also very different. The composition of the mold can be mainly divided into working parts and auxiliary parts.

The former is in direct contact with the processing material and requires higher material properties than the latter, such as higher hardness, wear resistance, heat resistance, and other requirements for the working parts of convex and concave molds. Non working areas can be appropriately lowered, but a certain level of toughness must be ensured. For auxiliary parts of molds, including fasteners, guide parts, etc., material selection can be based on their performance requirements.