Types and characteristics of construction machinery castings


Release time:

2022-06-15

(a) Cast iron Due to the low cost of cast iron, good manufacturability, and remelting and recycling can save resources and energy, the application and development of this material will not last long. For example, research and development of cupola-electric furnace double smelting process and equipment; Widely used molten iron desulfurization and filtration technology; Thin-walled high-strength cast iron manufacturing technology; Cast iron composite manufacturing technology; Cast iron surface or local strengthening technology; Isothermal normalizing ductile iron complete set of technology; The use of metal mold casting and metal mold sand casting, continuous casting and other special processes and equipment.

(a) Cast iron

Due to the low cost of cast iron, good manufacturability, and remelting and recycling can save resources and energy, the application and development of this material will not last long. For example, research and development of cupola-electric furnace double smelting process and equipment; Widely used molten iron desulfurization and filtration technology; Thin-walled high-strength cast iron manufacturing technology; Cast iron composite manufacturing technology; Cast iron surface or local strengthening technology; Isothermal normalizing ductile iron complete set of technology; The use of metal mold casting and metal mold sand casting, continuous casting and other special processes and equipment.

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(B) Construction machinery castings

The output of cast steel is relatively stable, but the quality, variety, performance of cast steel and the proportion of alloy steel and special steel continue to increase. The use of various refining processes and technologies to develop new cast steel materials can improve the strength, toughness and special properties of the materials.

(c) Engineering machinery casting alloy

Cast light alloys will be more widely used in aviation, aerospace, automotive, machinery and other industries due to a series of excellent characteristics such as low density, high strength and corrosion resistance. Especially in the automotive industry, in order to reduce fuel consumption, the use of aluminum and nickel alloy castings instead of steel and iron castings is a long-term development trend. Which focus on solving no pollution, simple operation of refining technology, metamorphism technology, grain refinement technology and furnace rapid detection technology. In order to further improve the performance of materials and maximize the potential of materials, high-quality aluminum alloy materials, especially aluminum matrix composites, can be developed to meet the performance requirements of various working conditions. Strengthen the cluster alloy melting process research, improve the alloy die-casting and squeeze casting process and related technology development research ferroalloy melting equipment and related technology and process development research.

(d) Composite materials for construction machinery castings

Composite materials will become a new engineering material in the 21st century. Casting composite materials will be devoted to the development and research of base material matrix materials and reinforced component materials of metal matrix composites, and will accelerate its application development and research.

Construction machinery casting defects are the main cause of scrap and a serious threat to the quality of castings. Due to various reasons, there are various defects in castings. Solidification molding, due to the differences in conditions, the types of defects in the form and performance of different parts. The solidification shrinkage of the liquid metal forms shrinkage pores and shrinkage. The redistribution of elements in the solid and liquid phases during solidification leads to segregation. The concentration of thermal stresses during cooling can cause cracking and deformation of castings. Engineering machinery castings shall be eliminated or minimized according to the cause and degree of occurrence. In addition, many defects, such as debris, pores, cold, etc., occur in the filling process, they are not only related to the type of alloy, but also related to the specific molding process. In short, to prevent, eliminate and control all kinds of defects is an important issue that can not be ignored.