Causes of affecting cast iron quality
Planning and manufacturability of iron castings. In planning, besides determining the shape and size of iron castings according to the working conditions and the properties of metal data, the rationality of planning should be considered from the viewpoint of casting alloy and casting process characteristics, i.e. remarkable scale effect and problems of condensation, shrinkage and stress, in order to prevent or reduce the composition of iron castings. Segregation, deformation, cracking and other defects.
There must be a reasonable casting process。 That is to say, according to the structure, component and size of cast iron, casting alloy characteristics and production conditions, suitable parting surface, moulding and core-making methods are selected, and casting bars, chills, risers and gating systems are reasonably set up。 To ensure that iron castings are obtained。
The quality of raw materials used for casting. The substandard quality of metal burden, refractory material, fuel, flux, modifier, casting sand, moulding sand binder, paint and other materials will lead to defects such as porosity, pinholes, slag inclusion and sand sticking, which will affect the appearance and internal quality of cast iron castings, and will cause cast iron castings to be scrapped in serious cases.
In process operation, it is necessary to draw up reasonable process operation rules, improve the skill level of workers, and make the process rules correctly implemented. In manufacturing, the quality of castings must be controlled and inspected. Firstly, we need to formulate the process codes and technical conditions from the original materials and auxiliary materials to the control and inspection of each specific product.
Each process is strictly controlled and inspected according to the codes and skills. The quality of the casting is checked. It is necessary to equip reasonable inspection methods and suitable testing personnel.
Generally, for the appearance quality of professional iron castings, the surface roughness of castings can be judged by comparing the sample blocks, and the fine cracks on the surface can be checked by coloring method and magnetic powder method.
The above information is collected and released by our Shandong cast iron guardrail。 Our company has won the unanimous praise of the masses with its professional level。 Welcome to call us for consultation and cooperation。 Our website is http://www。jnwszy。com!