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Casting method combining investment precise shell-making process with vacuum suction molding technology

A negative pressure molding and combination technology, applied in the field of investment casting, can solve problems such as slow solidification, coarse grains of castings, and reduced mechanical properties, so as to improve fluidity, reduce energy consumption, and avoid mechanical properties.

Inactive Publication Date: 2015-03-11
温州兰理工科技园有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this pouring method can improve the fluidity of the molten metal in the mold shell, ensure that the casting can well replicate the shape of the cavity, and obtain high-precision castings, however, the solidification speed of the molten metal in the hot mold is slow, which will cause Castings produce defects such as coarse grains and reduced mechanical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] An investment casting method for precision shell making, comprising the steps of:

[0033] 1) Making wax molds

[0034] Inject the molten paraffin into the aluminum mold, and get a precise wax pattern after cooling;

[0035] 2) Wax mold assembly

[0036] The wax mold forming the casting and the wax mold forming the gating riser system are connected together by welding or mechanical assembly to form a module;

[0037] 3) Coating and drying the surface of the wax module

[0038] Put the module in step 2) into the coating for dipping, choose a paste mixture composed of powdery refractory material and binder as the coating, and evenly cover the surface of the module with a total of 4 layers, coating layer by layer, gradually Layer drying; after coating the paint, sprinkle dry sand for reinforcement, and the total thickness is controlled at 3mm;

[0039] 4) Shell dewaxing recovery

[0040] After the coating is completely dried to form a high-strength shell, use hot wate...

Embodiment 2

[0049] An investment casting method for precision shell making. Compared with Example 1, step 5) the low-temperature roasting temperature of the mold shell is 200°C, step 7) the negative pressure of the sand box is kept at -0.03Mpa during negative pressure casting, and other process parameters No change, the manufactured precision casting products have been tested by flaw detection, and no excessive defects and cracks have been found on the surface and interior of the castings. After heat treatment, the mechanical properties and organizational properties and other indicators have reached or exceeded the design requirements.

Embodiment 3

[0051] An investment casting method for precision shell making. Compared with Example 1, step 5) the low-temperature roasting temperature of the mold shell is 400°C, step 7) the negative pressure of the sand box is kept at -0.45Mpa during negative pressure casting, and other process parameters No change, the manufactured precision casting products have been tested by flaw detection, and no excessive defects and cracks have been found on the surface and interior of the castings. After heat treatment, the mechanical properties and organizational properties and other indicators have reached or exceeded the design requirements.

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Abstract

The invention discloses a casting method combining an investment precise shell-making process with a vacuum suction molding technology. The casting method comprises the following steps: manufacturing a wax pattern, assembling the wax pattern, coating the surface of a wax pattern cluster with coating, drying, dewaxing and recovering a molding shell, performing low-temperature roasting on the molding shell, binning and moulding the shell, and performing negative pressure pouring. The casting method has the advantages that the manufacturing process of the molding shell is simplified, the manufacturing cost of the molding shell is reduced, the waste discharging volume is reduced, the low-temperature roasting is adopted, energy consumption is reduced greatly, and the problem of insufficient strength of the molding shell is solved through negative pressure pouring.

Description

technical field [0001] The invention belongs to the technical field of investment casting, and in particular relates to a casting method combining investment precision shell making technology and negative pressure molding technology. Background technique [0002] Investment casting usually refers to making patterns from fusible materials, covering the surface of the pattern with several layers of refractory materials to make a shell, and then melting the pattern and discharging the shell, so as to obtain a mold without a parting surface. After high-temperature roasting It can be poured with sand. Since patterns are widely made of waxy materials, investment casting is often referred to as "lost wax casting". The types of alloys that can be produced by investment casting include carbon steel, alloy steel, heat-resistant alloy, stainless steel, precision alloy, permanent magnet alloy, bearing alloy, copper alloy, aluminum alloy, titanium alloy and ductile iron. [0003] Shell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/12B22D18/04
CPCB22C9/043B22C9/12B22D18/04
Inventor 袁子洲杨国来季克理季克琛
Owner 温州兰理工科技园有限公司
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