Method for preparing metal core for investment casting and precision investment casting method for aluminum alloy casting based on metal core

A technology of investment precision casting and aluminum alloy castings, which is applied in casting molding equipment, metal processing equipment, casting molds, etc., can solve the problems of small gaps and high requirements on the surface quality of gaps, and achieve the effect of high dimensional accuracy

Active Publication Date: 2013-08-14
XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem in the prior art that there are no small gaps and the surface quality of the gaps is high, the present invention provides a method for preparing a metal core for investment casting and a method for investment precision casting o

Method used

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  • Method for preparing metal core for investment casting and precision investment casting method for aluminum alloy casting based on metal core
  • Method for preparing metal core for investment casting and precision investment casting method for aluminum alloy casting based on metal core

Examples

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Example Embodiment

[0022] Example 1

[0023] A method for preparing a metal core for investment casting includes the following steps:

[0024] Metal core and molding: see figure 1 with 2 , Design a metal core 2 with a width of 0.50mm, leave a 7mm core head 3 on one end and reserve a hole 4 for removing the metal core on the core head 3, and the other end is the forming part 5, and then cut with a slow wire The nickel-based or iron-based high temperature alloy is processed into a designed metal core 2 and the surface of the metal core 2 is ground and polished to make the size accuracy of ±0.04mm.

[0025] A method for investment precision casting of aluminum alloy castings based on a metal core includes the following steps:

[0026] 1) Mold shell production: mix water glass, boric acid and titanium oxide according to the mass percentage of 5:25:70 to prepare titanium oxide coating. Use hot water to dissolve and dilute the titanium oxide coating to a concentration of 1.2g / cm 3 , The metal core 2 is heated...

Example Embodiment

[0030] Example 2

[0031] A method for preparing a metal core for investment casting includes the following steps:

[0032] Metal core and molding: design a metal core 2 with a width of 0.70mm, leave a 7mm core head 3 on one end and reserve a hole 4 for taking out the metal core on the core head 3, and the other end is the molded part 5, and then use The slow wire cutting method processes the nickel-based or iron-based high-temperature alloy into a designed metal core 2 and grinds and polishes the surface of the metal core 2 to make the size accuracy ±0.04mm.

[0033] A method for investment precision casting of aluminum alloy castings based on a metal core includes the following steps:

[0034] 1) Mold shell production: mix water glass, boric acid and titanium oxide according to the mass percentage of 3:29:68 to prepare titanium oxide coating. Use hot water to dissolve and dilute the titanium oxide coating to a concentration of 1.2g / cm 3 , The metal core 2 is heated to 100° C., and t...

Example Embodiment

[0038] Example 3

[0039] A method for preparing a metal core for investment casting includes the following steps:

[0040] 1) Metal core and molding: design a metal core 2 with a width of 0.6mm, leave a 7mm core head 3 on one end and reserve a hole 4 for taking out the metal core on the core head 3, and the other end is a molded part 5. Then, the nickel-based or iron-based high-temperature alloy is processed into a designed metal core 2 by a slow-moving wire cutting method, and the surface of the metal core 2 is ground and polished to make its dimensional accuracy ±0.04mm.

[0041] A method for investment precision casting of aluminum alloy castings based on a metal core includes the following steps:

[0042] 1) Mold shell production: mix water glass, boric acid and titanium oxide according to the mass percentage of 7:21:72 to prepare the titanium oxide coating. Use hot water to dissolve the titanium oxide coating and dilute the concentration to 1.2g / cm 3 , The metal core 2 is heated...

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Abstract

The invention provides a method for preparing a metal core for investment casting and a precision investment casting method for an aluminum alloy casting based on the metal core. The method comprises the following steps that: the metal core is designed; a nickel-based or iron-based high temperature alloy is processed into the designed metal core by a slow-feeding wire-cut method, and the surface of the metal core is ground and polished; the ground and polished metal core is fixed in a mould and then is cast to form an investment pattern; the investment pattern is coated, dewaxed, roasted and subjected to shell blowing; an aluminum alloy solution is smelted, and then, a mould shell for wrapping the metal core is poured; the mould shell is cleaned by a hydraulic shell cleaning machine; and after the residual mould shell is removed from an inner cavity, the mould shell is immersed by water, and the metal core is taken out by a fixture. By the method for preparing the metal core for the investment casting, many problems of low surface roughness of a sand mould, low strength of a plaster core and oxidization of a copper core for investment casting during mould shell roasting are solved, the problems of complicated working procedures and low yield rate are solved, and the aluminum alloy casting meeting technical requirements is produced.

Description

technical field [0001] The invention belongs to the field of precision equipment manufacturing, and in particular relates to a method for preparing a metal core for investment casting and a method for investment precision casting of aluminum alloy castings based on the metal core. Background technique [0002] With the development of precision equipment such as radar, some precision functional components are developing in the direction of compact structure and high electrical performance. Taking a waveguide as an example, the design of the waveguide includes a slot with a width of 0.8mm, a length of 3.6mm, and a depth of 5.2mm, and the roughness of the surface of the slot and other non-processed surfaces is required to be no greater than 3.2μ. Currently known forming methods include mechanical processing, electric discharge machining and casting to form the waveguide and its gaps. However, since the gap is surrounded by the wall of the waveguide, the machining tool rod cann...

Claims

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Application Information

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IPC IPC(8): B22C9/10B22C1/00B22C9/04
Inventor 王金龙周中波狄玮岚林琳和蓉张利军常辉薛祥义
Owner XIAN SUPERCRYSYAL SCI TECH DEV CO LTD
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