Nodular cast iron manhole cover is a very common cast iron process product. Now let's talk about the factors affecting the well cover of nodular cast iron.
1、 Process manipulation
It is necessary to formulate process operation procedures, improve the skill level of workers and accurately implement the process flow. In manufacturing, the quality of castings should be controlled and inspected. We should infer the process rules and skill conditions for the control and inspection of each specific product from the raw materials.
Each process shall be controlled and inspected in strict accordance with the process code and skill conditions. Finally, check the quality of the castings. Fair inspection methods and qualified inspectors shall be provided.
2、 Qualified casting process.
That is, according to the layout of iron castings, the weight and size shall be detailed, the casting alloy characteristics and production conditions, the qualified parting surface, modeling and core making essentials shall be selected, and the casting reinforcement, cold iron, riser and pouring system shall be set. To ensure better cast iron.
3、 Quality of raw materials for casting.
The quality and scale of metal furnace charge, refractory material, fuel, flux, modifier, casting sand, molding sand binder, coating and other materials will cause negative pores, pinholes, slag inclusion, sand sticking and other defects of cast iron castings, affect the surface quality and internal quality of cast iron castings, and scrap cast iron castings in serious cases.
4、 Planned manufacturability of iron castings.
When implementing the plan, in addition to determining the shape and size of iron castings based on factual conditions and metal material properties, we must also consider the feasibility of the plan from the perspective of casting alloy and casting process characteristics, that is, higher size effect and items such as agglutination, contraction and stress, so as to stop or eliminate the occurrence of segregation, deformation, cracking and other defects of iron castings. Generally, for the surface quality of iron castings, the specific force sample block can be used to determine the surface roughness of castings; Tiny cracks on the surface can be inspected by coloring method and magnetic particle method.
The above is the detailed introduction of Shandong ductile iron manhole cover. I hope it will be helpful to you If you have any questions, please contact us We will provide you with professional service http://www.djse94se.com