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Wax mold preparation method for investment casting precision casting

An investment precision casting and wax mold technology, which is applied in the field of aluminum alloy precision casting, can solve the problems affecting the dimensional accuracy and surface quality of castings, the dimensional accuracy of wax molds cannot be stably controlled, and the cooling shrinkage of wax molds is large, so as to improve dimensional stability Sex and production efficiency, high promotion and application value, and high mold precision

Active Publication Date: 2018-12-28
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the preparation of investment casting wax molds is mainly to take out the mold after molding, and then place the wax mold in a hot state of 40~50°C in a water tank to cool, but the wax mold shrinks greatly when it is cooled in a free state, and the molding process lacks temperature. monitoring, which directly leads to the unsteady control of the dimensional accuracy of the wax mold
For wax molds of thin-walled components (≤3.5mm), if conventional wax materials are used for molding, the strength of the thin-walled parts will be low, and the deformation will be serious during the process of mold taking and assembly, which will affect the dimensional accuracy and surface quality of the molded castings

Method used

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  • Wax mold preparation method for investment casting precision casting

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Effect test

Embodiment 1

[0023] Embodiment 1: as figure 1 and figure 2 As shown, this embodiment provides a mold for wax pattern forming of investment precision casting, including a mold consisting of an upper cover plate 5, a lower bottom plate 1, a left outer mold 2, a right outer mold 7 and a core mold 8. Cavity 3, the mandrel is fixed through the grooves set on the upper cover and the lower bottom plate, the wax injection hole 4 and the exhaust hole 5 are opened on the upper cover and communicated with the cavity, the left outer mold and the right outer mold are connected by bolts It is integrated, and its matching clearance is ≤0.15mm, which can be selected but not limited to 0.15mm, 0.10mm, 0.05mm, etc.

[0024] Wherein, the diameter of the wax injection hole is φ10-15mm, and the mouth is provided with a taper of 5-8°. The diameter of the wax injection hole can be selected but not limited to φ10mm, φ11mm, φ12mm, φ13mm, φ14mm or φ15mm, and the taper can be selected but not limited to 5°, 6°, 7...

Embodiment 2

[0035] Embodiment 2: This embodiment takes a thin-walled aluminum alloy cabin casting as the application object. The specific outline dimensions: height 345mm, large end circle Φ135mm, small end circle Φ132mm, main body wall thickness 8.0mm, typical thin-walled cabin casting structure , the thin wall accounts for more than 85%, and the inner cavity contains 8 longitudinal ribs with a width of 6mm, 4 small circular bosses of Φ20mm, and 1 square boss of 50mm×50mm.

[0036] The operation steps of wax mold forming of aluminum alloy cabin body components are carried out as follows:

[0037] (1) Clean the mold with industrial alcohol on the wax pressing platform first, and brush lubricating oil on the inner cavity of the mold with a brush, then place the core mold in the corresponding groove of the lower bottom plate, cover the upper cover plate, and lock it with bolts For the left and right outer molds of the mold, ensure that the matching gap is ≤0.15mm. Finally, insert a thermoco...

Embodiment 3

[0042]Embodiment 3: This embodiment takes a thin-walled aluminum alloy cabin casting as the application object. The specific outline dimensions: height 435mm, large end circle Φ245mm, small end circle Φ230mm, main body wall thickness 3.5mm, typical thin-walled cabin casting structure , the thin wall accounts for more than 75%, and the inner cavity contains 4 longitudinal ribs with a width of 10mm, 10 small circular bosses of Φ25mm, and 4 circular bosses of Φ78mm.

[0043] The operation steps of wax mold forming of aluminum alloy cabin body components are carried out as follows:

[0044] (1) Clean the mold with industrial alcohol on the wax pressing platform first, and brush lubricating oil on the inner cavity of the mold with a brush, then place the core mold in the corresponding groove of the lower bottom plate, cover the upper cover plate, and lock it with bolts For the left and right outer molds of the mold, ensure that the matching gap is ≤0.15mm. Finally, insert a thermoc...

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Abstract

The invention discloses a wax mold preparation method for investment casting precision casting. The wax mold preparation method comprises the following steps that (1), mold closing is performed; (2),wax material preparation is carried out, wherein the wax material is added into a heat preservation furnace of a wax pressing machine; the temperature is raised to 90 DEG c to 100 DEG c, and after thewax material is completely melted, silicon carbide particles with the particle size of 6-14 [mu]m and the content of 3-5 wt% are added while the mixture is stirred, standing for 20-30 minutes is performed after the silicon carbide particles are completely added; cooling water with the temperature of 20-25 DEG c is injected into a cooling groove of the wax pressing machine for reducing the temperature of the wax to be 55-60 DEG c for later use; and (3), wax mold pressing is carried out, wherein a wax injection gun is used for injecting the wax material in the wax pressing machine into a mold cavity at the pressure of 0.3-0.5MPa, and when the wax is discharged from exhaust holes, wax injection is stopped; next, a mold water cooling system is started, and the flow is controlled to be 5-8 L / min; and when a temperature measurement thermocouple detects that the temperature of the wax is less than or equal to 35 DEG c, the mold is opened to take out the wax mold. According to the method, theeffect of enhancing the strength of the wax mold is achieved through the framework, the size contraction and deformation of the wax mold can be reduced effectively, the precision of the prepared waxmold can reach + / -0.5 mm, and the shrinkage rate is stabilized within 0.40%.

Description

Technical field: [0001] The invention relates to a wax mold preparation method for precision investment casting, especially suitable for the wax mold preparation of aluminum alloy cabin components, and belongs to the technical field of aluminum alloy precision casting. Background technique: [0002] With the demand for lightweight development, complex thin-walled aluminum alloy components are increasingly used in aerospace, weapons, ships and other fields. Investment plaster type vacuum pressure casting technology is an advanced casting technology integrating investment casting, vacuum filling and pressure solidification. Low (Ra3.2~Ra6.3), high dimensional accuracy (CT5~CT7), small deformation (≤1mm / 1000mm), etc. [0003] At present, the preparation of investment casting wax molds is mainly to take out the mold after molding, and then place the wax mold in a hot state of 40~50°C in a water tank to cool, but the wax mold shrinks greatly when it is cooled in a free state, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C7/02
CPCB22C7/02
Inventor 赵高瞻黄志伟陈强赵祖德陶健全万元元李明邢志辉
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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