DOE (design of experiments) method for controlling surface holes when aluminum alloy precision die-casting fittings are machined

Abstract

The invention discloses a novel technology for effectively controlling the sizes and the quantities of surface holes by the aid of Design-Expert software when aluminum alloy precision die-casting components are machined. The novel technology has the advantages that the sizes, the quantities and the distribution of the surface holes are important marks for measuring the quality of castings, cast holes are frequently difficult to predict and control when aluminum alloy precision die-casting components are machined at present, and the quality of the aluminum alloy precision die-casting components can be deteriorated; appropriate samples are selected after blanks of the aluminum alloy precision die-casting components are completely manufactured, the sizes and the quantities of cast holes inside the blanks are measured according to selected region standards of the Design-Expert software, rules of the sizes and the quantities of the cast holes inside the aluminum alloy precision die-casting components under the condition of identical manufacturing parameters of a batch are simulated, the machining allowance of the components is adjusted on the basis of the rules, drawing requirements can be ultimately met by the surface holes in the aluminum alloy die-casting components and the sizes of the surface holes, the product qualified rate reaches 90%, and accordingly the rejection rate can be effectively reduced.

Description

technical field [0001] The invention relates to a DOE method for surface hole control during machining of aluminum alloy precision die castings, and belongs to the technical field of aluminum alloy die casting quality control. Background technique [0002] Aluminum alloy precision die casting is the most productive of all casting methods for automotive parts. It is a casting method that fills the mold with liquid or semi-liquid metal at high speed under high pressure and solidifies into a casting under pressure. Porosity is unavoidable when die-casting parts are filled in the cavity, especially when holes appear on the surface of the die-casting workpiece, it will seriously affect its quality and lead to scrapping. Therefore, it is of great significance to study the method of controlling and reducing the surface holes of die castings to improve their mechanical properties and product quality. [0003] The present invention takes the holes in aluminum alloy precision die-ca...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a DOE method for surface hole control of aluminum alloy precision die castings during machining, which overcomes the fact that the existing control of the machining allowance of aluminum alloy precision die castings is often based on past experience and has great randomness And the lack of uncertainty, through the present invention, under the premise of certain aluminum alloy precision die-casting production process parameters, it provides a technology to control the size and quantity of holes on the surface of aluminum alloy die-casting parts, so as to solve the problems caused by the leakage of holes in actual production. To solve the problem of high scrap rate during die casting processing, improve its mechanical properties and improve product quality

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