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Space curve type casting anti-deformation box cage structure and machining method

A technology of space curves and processing methods, applied in metal processing equipment, casting molds, cores, etc., can solve the problem that the dimensional accuracy of castings cannot meet the processing and use requirements, and achieve the elimination of deformation defects, reduce production costs, and improve production efficiency Effect

Inactive Publication Date: 2016-03-30
INNER MONGOLIA NORTH HEAVY INDS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only improves the production efficiency, but also reduces the production cost, and solves the problem that the dimensional accuracy of the castings of the upper guide rail and the lower guide rail cannot meet the processing and use requirements

Method used

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  • Space curve type casting anti-deformation box cage structure and machining method
  • Space curve type casting anti-deformation box cage structure and machining method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Take solving the height and radial deformation of the lower guide rail as an example.

[0047] According to the casting structure of the lower guide rail and the actual deformation in production practice, the improvement measures are formulated as follows:

[0048] First: Change the casting method and control the number of deformations.

[0049] Using the resin sand casting process instead of the investment casting process, the resin sand will not be deformed during the molding process, which can effectively reduce the three deformation processes in the mold making stage. Resin sand adopts natural silica sand, SiO 2 The content is required to be above 98%, the angle coefficient should be less than 1.3, and the particle size should be 50-100 mesh.

[0050] Second: Design the anti-deformation box cage structure with space curve type castings to offset the internal stress caused by casting shrinkage and control the deformation during the pouring process and heat treatmen...

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Abstract

The invention relates to a process method with the space curve type casting anti-deformation function, and belongs to the field of machine manufacturing. By means of a casting method for changing an upper guide rail casting and a lower guide rail casting, an upper annular cavity type tie bar, a lower annular cavity type tie bar, upper follow-up cavity type tie bars and lower follow-up cavity type tie bars are communicated with a straight sprue, transverse sprues and inner sprues to form a box cage structure. The number of times of deformation in the casting forming process is controlled, and the deformation is controlled within 0.5 mm. In the pouring and heat treatment process, under the alternating stress action of heating and cooling, the castings bear irresistible residual stress which cannot be fully offset in the shell expansion and casting shrinkage process, and irregular and disordered permanent plastic deformation is generated. For deformation, a one-mold two-piece process is adopted, the heads and tails are oppositely arranged, the box cage structure is designed, and the deformation of the castings is reduced. The residual stress of the castings is removed through subsequent heat treatment, and it is guaranteed that no excessive deformation is generated after casting cleaning.

Description

technical field [0001] The invention relates to a process method for preventing deformation of a curved casting in space, and belongs to the field of mechanical manufacturing. Background technique [0002] The upper guide rail and the lower guide rail are typical space curved castings in military steel castings. The outline dimensions of these two castings are upper guide rail: 305×240×183, lower guide rail: 325×123×132mm, the main wall thickness is 8mm and the space plate castings are distributed according to the right-handed helix. Due to structural reasons, the two types of parts are deformed in three stages during the production process, namely: deformation in the molding process, deformation in the pouring process, and deformation in the heat treatment process. The deformation causes the axial and radial dimensions of the helix to fail to meet the processing needs of the product. . Contents of the invention [0003] The object of the present invention is to provide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/22B22C9/08
Inventor 冯义宏云雪峰霍志刚刘宇航封禹苏有
Owner INNER MONGOLIA NORTH HEAVY INDS GROUP
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