Sand-coated iron mold casting device for friction rings of brake discs for high-speed rails and casting technology

Abstract

The invention discloses a sand-coated iron mold casting device for friction rings of brake discs for high-speed rails and a casting technology. The sand-coated iron mold casting device comprises an upper mold modeling device and a lower mold modeling device. The upper mold modeling device comprises an upper mold plate, the upper mold plate is provided with an upper pattern of a round ring shape, a pouring system is arranged at the part, in the middle hole of the upper pattern, of the upper mold plate, an upper sand box is arranged above the upper mold plate in a matched mode, and electric heating rods horizontally arranged are installed in the upper mold plate. The lower mold modeling device comprises a lower mold plate, a lower sand box is arranged above the lower mold plate in a matched mode, and the electric heating rods horizontally arranged are installed in the lower mold plate. The chilling effect of sand-coated iron molds on molten liquid is good, and the friction performance of products is greatly improved; the turning amount of brake disc castings is small, and the yield of the technology can reach 80%; the surface quality of the brake disc castings is high, and flash burrs are avoided. According to the technology and the casting device, the qualified brake disc castings can be successfully produced, the domestic gap is filled in, and the market requirement is met.

Description

technical field [0001] The invention relates to an iron mold sand-covered casting process and a casting device for a brake disc friction ring used for high-speed railways. Background technique [0002] Brake discs are components used in the high-speed rail industry. This piece is in the shape of a ring, with an outer diameter (the outer circle of the friction ring casting) Φ1050mm, an inner diameter (the inner circle of the friction ring casting) Φ730mm, a height of 61mm, uneven wall thickness, the largest part is 49mm, and the surface distribution of the brake disc is 35mm in height and 8.3mm in width. The radiating ribs with a pitch of 23-30 are distributed with elliptical and circular navels (bosses) on the circle of Φ890mm (circle where the center of the bolt hole is located). [0003] It is worth noting that during machining, firstly, the outer circle of the friction ring casting is turned by taking the small end of the draft angle of the outer draft rib of the heat di...

AI Technical Summary

Problems solved by technology

[0009] The structure of the brake disc seems simple, but it is difficult to cast castings that meet the above requirements. The main quality problems are deformation of the castings, defects such as slag inclusions on the upper surface, and pores.

[0010] At present, the main way to produce brake disc castings is to use resin sand casting technology to produce them, but the scrap rate is high. The specific reasons for the scrap are as follows: 1. The brake disc castings are circular and have a large diameter, resulting in Casting deformation often occurs in the specific production process; 2. The wall thickness of the brake disc castings varies greatly, and cold insulation often occurs during the production process, resulting in casting defects, or internal shrinkage defects; 3. Brake disc castings often There is an expansion of the box, which leads to the out-of-tolerance of the casting; 4. There are many ribs on the surface of the brake disc casting, and the compactness of the molding sand between the ribs is low. Iron-clad sand often appears here, and it is difficult to clean the casting afterwards; 5. The compactness of the sand mold of the castings cannot be well controlled, resulting in unstable shrinkage of the castings, resulting in out-of-tolerance dimensions of the castings

The existing production method for brake disc castings results in poor surface quality of the brake disc, low process yield and high production cost

Due to the continuous development of my country's high-speed rail industry, the demand for high-speed rail brake discs continues to increase, and the domestic production quality is difficult to meet the demand. Therefore, the brake discs basically rely on imports. Now there is an urgent need for casting devices and processes that can ensure the quality and precision of brake discs. method

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