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A method for controlling solidification of investment casting castings

A technology for investment casting and casting, applied in the field of controlling the solidification of investment casting castings, can solve problems such as poor heat dissipation, shrinkage porosity, shrinkage holes, etc., to avoid shrinkage holes, improve yield and yield, and speed up solidification and cooling. Effect

Active Publication Date: 2020-10-30
CSIC NO 12 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a method for controlling the solidification of investment casting castings, which simplifies the operation process and solves the problem of shrinkage, porosity, Casting quality problems such as shrinkage cavity

Method used

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  • A method for controlling solidification of investment casting castings
  • A method for controlling solidification of investment casting castings
  • A method for controlling solidification of investment casting castings

Examples

Experimental program
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Embodiment 1

[0033] The casting 1 structure of a type II retaining ring is a ring structure (such as figure 1 shown), the cross-sectional shape is "I"-shaped structure (such as figure 2 As shown), during the process design, there is always a hot spot in the lower triangular area, which is difficult to completely eliminate, and eventually leads to shrinkage cavity and shrinkage porosity defects in this part. According to this invention, using such as image 3 and Figure 4 According to the process scheme shown, according to the shape and process requirements of the casting 1 of the type II retaining ring, set the sprue 2 and the runner 3, as well as the riser 4 and the ingate 5 and determine their positions. First, use the ProCAST software The simulation analysis shows that the immersion process parameters are immersion depth of 30 mm and immersion time of 10 seconds; after the wax model is made and the wax model is assembled, the wax model is coated with paint according to the process. ...

Embodiment 2

[0035] A shell casting 1 such as Figure 5 As shown, the weight of the casting is up to 13Kg, and the top-riser horizontal process is used in the process design. During actual pouring, shrinkage cavities or shrinkage defects often appear at the bottom of the flanges on both sides. After applying this invention, it is used to control investment casting castings For the method of solidification, after the simulation of the casting process simulation software, the water immersion process parameters are obtained as the immersion depth of 50mm, and the immersion time is not less than 35 seconds. In actual production, according to this process, when the seventh layer is completed in the coating shell, use The mold shell is reinforced with iron wires, and the distance between the iron wires is about 50mm, which is reinforced in a mesh shape, and then the shell-making process of the next three layers of paint is completed; then, after dewaxing and roasting, stainless steel water is p...

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Abstract

The invention discloses a method for controlling an investment casting to solidify. The method comprises the steps of determining water-immersed cooling parameters of a mold shell which is cast; manufacturing a wax mold, and combining into a mold group; painting the mold group so as to prepare the shell, reinforcing the outer surface of the mold group when 50% to 70% of the schedule of the shell layer preparing number is completed, and then continuing to implement the painting and shell preparing procedure; dewaxing and roasting after the shell preparation is completed so as to form the finished mold shell; and casting, and performing water-immersed cooling treatment on positions, which need to be cooled, of the mold shell according to the water-immersed cooling requirement after casting.According to the method for controlling the investment casting to solidify, the mold shell is properly reinforced, so that the mold shell is not cracked in a water cooling process, and the cooling process and positions of the mold shell which is cast are improved by utilizing a casting process simulation analysis technique, so that the purpose of controlling the casting to solidify during investment casting is achieved, the local solidifying and cooling speed of the casting is increased, the defects of shrinkage cavities and looseness of the casting are avoided, and the yield and the rate of finished products of the casting are increased.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and in particular relates to a method for controlling the solidification of investment casting castings. Background technique [0002] Investment castings are generally complex in structure and have many thermal joints. The traditional casting method is to use runner feeding or riser feeding, resulting in low yield and low efficiency; at the same time, some parts are used to realize casting feeding. , using local heat preservation to delay the solidification time of the feeding channel to obtain castings without shrinkage cavities and looseness, but this method is difficult to operate and the effect is poor. Due to the special structure of some castings, after the process design, there are still large isolated thermal joints at the bottom, which makes feeding difficult, resulting in defects. [0003] A domestic and foreign technical novelty search was carried out on the process of cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04
CPCB22C9/04
Inventor 巩红涛马敏团高磊杨军张威
Owner CSIC NO 12 RES INST
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