Brake drum casting process

Abstract

The invention relates to a brake drum casting process. The process includes the following steps that sand is mixed, specifically, the resin sand is used as the raw material, and a sand box is made after casting sand is prepared according to a ratio; dies are manufactured, specifically, the brake drum inner mold casting die and the brake drum outer mold casting die are manufactured according to the size and shape of a brake drum; smelting is conducted, specifically, raw materials are prepared according to a certain ratio and placed in an electric furnace to be smelted; pouring is conducted, specifically, molten iron obtained in the third step is poured into a sand mold inside a double-layer die; cooling is conducted to the normal temperature; a casting box is opened, a molded brake drum is taken out, shot blasting and polishing are carried out on the brake drum after the surface of the brake drum is cleaned, annealing is carried out after polishing, and surface strengthening is conducted; and machining is conducted, specifically, the brake drum is placed on a numerical control lathe to be machined, so that a finished product is obtained. The brake drum casting process has the advantages of being reasonable in procedure, capable of saving the raw materials and reducing the cost, simple in operation, stable in work, high in production efficiency, high in product percent of pass and good in molding quality.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a brake drum casting process. Background technique [0002] In recent years, with the continuous development of science and technology, people's living standards have been continuously improved, the application of automobiles has become more and more extensive, the automobile industry has also developed rapidly, and the demand for automobiles has also continued to increase. The automobile industry has become an important part of the national economy. As a pillar industry, the development of the automobile industry provides a huge development space for the development of auto parts, especially foundry enterprises. It plays a vital role. Since the brake drum bears a large frictional force, the requirements for the strength, hardness and other mechanical properties of the brake drum, as well as thermal conductivity, wear resistance and fatigue resistance are relatively h...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the continuous development of science and technology, people's living standards have been continuously improved, the application of automobiles has become more and more extensive, the automobile industry has also developed rapidly, and the demand for automobiles has also continued to increase. The automobile industry has become an important part of the national economy. As a pillar industry, the development of the automobile industry provides a huge development space for the development of auto parts, especially foundry enterprises. It plays a vital role. Since the brake drum bears a large frictional force, the requirements for the strength, hardness and other mechanical properties of the brake drum, as well as thermal conductivity, wear resistance and fatigue resistance are relatively high. At present, the casting process is medium-sized The role of sand in foundry production is extremely important. The casting waste caused by poor quality of molding sand accounts for a relatively large proportion of the total casting waste. Ordinary molding sand is mainly composed of raw sand, clay binder, water and coal powder. , often fail to meet the requirements, which will easily lead to short life of automobile brake drums and frequent replacement, resulting in serious material consumption and unsatisfactory product performance. The traditional concept of brake drum materials and casting processes cannot meet new technical requirements. The metallographic structure and graphite morphology of the moving drum cannot meet the requirements. The brake drum has low strength, poor wear resistance, short service life, poor processing performance, and high hardness. It is easy to crack prematurely during use, especially in During the braking process, it is easy to produce abnormal noise and vibration, low pass rate and short service life of the product. Therefore, a design with reasonable process, saving raw materials, uniform pouring, simple operation, stable work, high production efficiency and high product pass rate , The casting process of brake drum with good molding quality is very necessary, which plays an important role in improving the production efficiency and service life of brake drum