Method for vacuum auxiliary gravity pouring investment casting thin wall piece

A technology of investment casting and gravity casting, which is used in the production of various thin-walled, casting casting, and complex investment casting parts. It can solve the problems of complex equipment structure, large equipment investment and high equipment requirements, and achieve simple equipment structure and investment. Small, the effect of reducing production costs

Inactive Publication Date: 2007-10-24
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, low-pressure pouring, pressure-regulating pouring, and vacuum suction casting all belong to anti-gravity pouring, and the mold shell needs to be inverted above the metal smelting furnace. The equipment structure is complicated, the operation is inconvenient, and the requirements for the equipment are relatively high.
The equipment structure of centrifugal casting is also relatively complicated, and the investment in equipment is also large

Method used

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  • Method for vacuum auxiliary gravity pouring investment casting thin wall piece

Examples

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Comparison scheme
Effect test

Embodiment 1

[0012] A casting method for vacuum-assisted gravity casting investment casting special-shaped pipe castings for automobiles (material ZG35, outline size 65mm×70mm×75mm, minimum wall thickness 2mm), the specific steps are as follows:

[0013] 1. Put the baked shell on the fixture of the container;

[0014] 2. A sealing device is placed between the shell and the upper cover, and the upper cover of the container is covered;

[0015] 3. Adjust the fixing device to ensure that the shell and the container form a closed space;

[0016] 4. Turn on the heating device and control the shell temperature at 1050°C;

[0017] 5. Turn on the vacuum system to stabilize the vacuum in the container at 0.03MP;

[0018] 6. Pour cast steel molten metal with a melting temperature of 1600°C into the shell;

[0019] 7. After the molten metal fills the shell for 2 seconds, turn off the vacuum system;

[0020] 8. After keeping for a period of time, release the vacuum;

[0021] After cleaning the sh...

Embodiment 2

[0023] A casting method for a vacuum-assisted gravity pouring investment casting six-way pipe fitting casting (material stainless steel 304, outline size 70mm×75mm×50mm, minimum wall thickness 1.8mm), the specific steps are as follows:

[0024] 1. Put the baked shell on the fixture of the container;

[0025] 2. A sealing device is placed between the shell and the upper cover, and the upper cover of the container is covered;

[0026] 3. Adjust the fixing device to ensure that the shell and the container form a closed space;

[0027] 4. Turn on the heating device and control the shell temperature at 1050°C;

[0028] 5. Turn on the vacuum system to stabilize the vacuum in the container at 0.03MP;

[0029] 6. Pouring molten stainless steel with a melting temperature of 1600°C into the shell;

[0030] 7. After the molten metal fills the shell for 3 seconds, turn off the vacuum system;

[0031] 8. After keeping for a period of pouring time, release the vacuum;

[0032] After cl...

Embodiment 3

[0034] A casting method for vacuum-assisted gravity casting investment casting of bicycle connector castings (material ZL101, outline size 70mm×40mm×60mm, minimum wall thickness 1.9mm), the specific steps are as follows:

[0035] 1. Put the baked shell on the fixture of the container;

[0036] 2. A sealing device is placed between the shell and the upper cover, and the upper cover of the container is covered;

[0037] 3. Adjust the fixing device to ensure that a closed space is formed between the shell and the container;

[0038] 4. Turn on the heating device and control the shell temperature at 400°C;

[0039] 5. Turn on the vacuum system to stabilize the vacuum degree in the closed space of the container and the shell at 0.04MP;

[0040] 6. Pour aluminum alloy molten metal with a melting temperature of 700°C into the shell;

[0041] 7. After the molten metal fills the shell for 4 seconds, turn off the vacuum system;

[0042] 8. Release the vacuum;

[0043] After cleanin...

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Abstract

The invention relates to a vacuum assisted gravity pouring fuse cast thin wall casting method. It fixes the baked fuse mold casting shell inside the container with sealing device between the shell and the container, capped the top cover of the container, adjusting the fixed device, forming enclosed space between the shell and the container, turning on the heating device to retain the temperature requirement if necessary, turning on the vacuum system to establish the vacuum degree, pouring metal fluid into the cavity after the generation of negative pressure inside the shell, closing the vacuum system, release the vacuum, cleaning the shell to get the complete casting piece. The equipment structure is simple, small in investment, convenient in operation, being able to improve the final product rate of the thin wall casting piece and metal utilization rate to reduce production cost.

Description

technical field [0001] The invention relates to a casting pouring method, in particular to a method for producing various thin-walled and complex investment casting parts, and belongs to the technical field of investment casting. Background technique [0002] The general process of investment precision casting is: wax pressing, gate wax making, tree forming, shell making, dewaxing, roasting, pouring, cleaning and other processes. The casting mold of the investment casting is the mold shell, which is made by coating and sanding many times, and has a certain degree of air permeability. After the shell is baked, it needs to be poured. [0003] Commonly used pouring methods include gravity pouring, low pressure pouring, pressure regulating pouring, centrifugal pouring and vacuum suction casting. Gravity pouring is the most widely used in investment casting companies due to its convenience and simplicity of operation. In the case of conventional gravity casting, for thin-walle...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D18/06
Inventor 吕志刚崔旭龙闫双景姜不居戴旭
Owner TSINGHUA UNIV
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