Casting process of bearing cover

Abstract

The invention discloses a casting process of a bearing cover. The bearing cover mainly comprises the following raw materials of, in parts by weight, 18%-25% of Zn, 2.5%-4.5% of Fe, 8%-12% of Cu, 2.5%-5.0% of Cr, 1.8%-2.5% of Mo, 5.0%-6.5% of Ni, 10%-15% of Sr, 7.5%-9.0% of Co, 3.0%-4.0% of Sn, and the balance Al. According to the casting process of the bearing cover, various elements are scientifically matched, the synergistic effect stability of all the elements is good, the bearing cover can be modified and refined, the bearing cover with finer crystal grains and more uniform distribution isobtained, the tensile strength, the yield strength and the elongation of the obtained bearing cover are greatly improved, the bearing cover has excellent impact toughness and corrosion resistance, the safety is good, and the bearing cover is durable.

Description

technical field [0001] The invention relates to the technical field of casting technology, in particular to a casting technology of a bearing cap. Background technique [0002] Bearing caps are one of the most common parts in large mechanical equipment; ordinary bearing caps include a bearing cap body, which has a cavity inside, a bottom edge at the bottom of the bearing cap body, and a set of cylindrical shapes on the inner side of the bottom edge. Fixed column; the casting process of the bearing cover is to pour molten iron into the sand mold and obtain the casting after cooling; due to the characteristics of ductile iron castings, the cooling and solidification is from the outside to the inside, and the outside is cooled quickly, and the inside is cooled slowly. After the solidification process, it is easy to make the wall thickness of the casting loose, resulting in scrapped parts. In addition, the melting process and pouring process of the existing bearing cap casting a...

AI Technical Summary

Problems solved by technology

[0002] Bearing caps are one of the most common parts in large mechanical equipment; ordinary bearing caps include a bearing cap body, which has a cavity inside, a bottom edge at the bottom of the bearing cap body, and a set of cylindrical shapes on the inner side of the bottom edge. Fixed column; the casting process of the bearing cover is to pour molten iron into the sand mold and obtain the casting after cooling; due to the characteristics of ductile iron castings, the cooling and solidification is from the outside to the inside, and the outside is cooled quickly, and the inside is cooled slowly. After the solidification process, it is easy to make the wall thickness of the casting loose, resulting in scrapped parts. In addition, the melting process and pouring process of the existing bearing cap casting are relatively unreasonable, resulting in poor performance of the casting in terms of tensile strength, elongation and yield strength. unsatisfactory

[0003] At present, the blank casting process of the bearing cover generally adopts the single casting method. The specific process is: the bearing hole of the bearing cover faces downward, the vertical shape is formed, and the single riser is located at the top of the casting; Bearing cap blanks, but this process has the disadvantage of low production efficiency. When mass production is easily limited by the turnover of tooling, resulting in insufficient production capacity; moreover, according to the production status of vertical casting in the past, the upper plane of the casting and the lower part of the riser Casting defects often appear on the two-step plane. The light ones affect the appearance of the castings and increase the welding repair rate of the castings. The serious ones may lead to the scrapping of the castings. The lack of basic existing technologies requires an urgent need for a casting process for bearing caps