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A variable-wall-thickness sand mold structure design method for targeted control of casting microstructure and variable-wall-thickness sand mold structure

A technology of microstructure and structure design, applied in the field of sand casting, can solve the problems of shrinkage cavity casting microstructure, affecting the overall performance of castings, inconsistent heat dissipation, etc. Avoid the effects of manufacturing and machining processes

Active Publication Date: 2022-07-12
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of casting cooling and solidification, due to the traditional sand casting, the upper and lower sand boxes are of square structure, which inevitably makes the wall thickness of each part of the sand mold uneven, resulting in the heat dissipation of each part of the casting when casting parts with complex structures Inconsistency, these factors make the cooling rate of each part of the casting inconsistent, easy to produce shrinkage porosity, shrinkage cavity and other casting defects in the part of the casting after cooling and solidification, and the microstructure of each part of the casting is uneven, thus affecting the overall performance of the casting

Method used

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  • A variable-wall-thickness sand mold structure design method for targeted control of casting microstructure and variable-wall-thickness sand mold structure
  • A variable-wall-thickness sand mold structure design method for targeted control of casting microstructure and variable-wall-thickness sand mold structure

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Embodiment 1

[0039] like figure 1 Shown is the variable thickness sand mold structure when casting the shell, including the inner working part 1 of the sand mold and the peripheral variable wall thickness part 2 of the sand mold; the inner working part 1 of the sand mold is a hollow shell, and the inner shape of the hollow shell is determined by the shell. The shape of the body part is determined; the peripheral variable wall thickness part 2 of the sand mold is determined by the heat dissipation of the part; the sand mold inner working part 1 is connected with the sand mold peripheral variable wall thickness part 2 as a whole.

[0040] The specific implementation process is: due to the uneven wall thickness of the casting and the uneven heat dissipation of each part, the exterior of the sand mold is designed as the peripheral variable wall thickness part 2 of the sand mold, such as figure 1 shown. In order to make the core meet the strength requirements during the casting process, the wa...

Embodiment 2

[0045] like figure 2 Shown is the variable-thickness sand mold structure when casting gearbox housing parts, including the inner working part 1 of the sand mold and the peripheral variable wall thickness part 2 of the sand mold; the inner working part 1 of the sand mold is a hollow shell; The internal shape is determined by the shape of the gearbox parts; the peripheral variable wall thickness part 2 of the sand mold is determined by the heat dissipation of the parts; the sand mold inner working part 1 and the sand mold peripheral variable wall thickness part 2 are connected as a whole.

[0046] The specific implementation process is that, in order to reduce the amount of sand used in making the sand mold, and at the same time to ensure that the parts dissipate evenly during the casting process, the exterior of the sand mold is designed as the outer part of the sand mold with variable wall thickness. figure 2 shown. In order to make the sand mold meet the strength requireme...

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Abstract

The invention discloses a variable-wall-thickness sand mold structure for targeting and controlling the microstructure of a casting and a manufacturing method thereof, belonging to the field of sand mold casting. On the basis of maintaining the structure and strength required for sand mold work, the temperature field during alloy solidification is improved by changing the structure and wall thickness of the external sand box, so that the cooling rate of each part of the casting is consistent, casting defects are avoided, and the casting is improved. The uniformity of the structure and the quality of the castings; at the same time, the outer sand box becomes a conformal design, and the sand box is no longer a traditional cubic structure, which effectively reduces the volume of the sand mold, saves the original sand, and reduces the cost.

Description

technical field [0001] The invention belongs to the field of sand casting, and relates to a variable-wall-thickness sand-mould structure design method for targeting and controlling the microstructure of a casting and a variable-wall-thickness sand mould structure. Background technique [0002] Sand casting refers to the manufacturing method of producing castings in sand, and more than 80% of the products in the foundry industry are completed by sand casting. Compared with other casting methods, sand casting has the advantages of low cost, simple production process, short production cycle, and a wide range of application alloys, so it is widely used in castings with complex spatial structures, such as engine blocks and heads, impellers, blades, Transmission case and valve body, etc. In the traditional sand casting process, it is necessary to prepare a corresponding mold according to the shape of the casting, and then use the mold to prepare the sand core and the upper and lo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/02
CPCB22C9/02
Inventor 杨强李成伟王富李涤尘崔晓涵
Owner XI AN JIAOTONG UNIV
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