Self-adaptive casting mould manufacture method for casting

Abstract

The invention relates to a self-adaptive casting mould manufacture method for a casting, which belongs to the technical field of casting and numerical control machining. The method of the invention comprises the following steps of: constructing a three-dimensional solid model of a casting mould according to a casting drawing and reversely solving a cavity of the casting mould; carrying out sand block partitioning design according to the structural characteristics of the casting mould; manufacturing a sand mould (core) in blocks by selecting different mould sand materials, such as zircon powder, mullite powder, quartz sand, and the like; adding cold iron, a cooling pipeline, and the like into different parts of the casting mould according to a simulating result of pouring solidification; processing the sand mould (core) in blocks; and after forming the mould (core), post processing and forming a final poured casting mould. The type and the shrinking percentage of molding sand for each sand block are determined according to a simulating result of a stress field and a temperature field during mold filling and solidification processes. Finally, the size of sand blocks required to be mixed is determined so as to establish the casting mould of each sand block. The invention can singly design each casting mould (mould sand material can be different) according to the structural characteristics and local solidification characteristics of the casting and greatly improves the flexibility and the operability of casting mould design and the adaptability of the casting. The self-adaptive casting mould manufacture method is especially suitable for the manufacture of a single casting and small-mass castings.

Description

technical field [0001] The invention relates to an adaptive casting mold manufacturing method for castings, belonging to the technical fields of casting and numerical control processing. Background technique [0002] Casting can produce complex parts and is one of the most important processing methods for metal forming. With the globalization of the market and the intensification of competition, the speed of product upgrading is accelerating, and the demand for single-piece and small-batch castings is increasing. The production process of single-piece, small-batch, especially large-scale castings requires a short production cycle. , the manufacturing method is more flexible. However, due to the unreasonable structural design of some castings and the difference in heat transfer coefficient, interface heat transfer coefficient and shrinkage rate, the castings are rejected. In order to solve this problem, the present invention proposes an adaptive mold manufacturing method fo...

AI Technical Summary

Problems solved by technology

[0004] Due to the long processing cycle and high cost of wooden molds, metal molds, and core boxes in traditional sand mold manufacturing, it is difficult to manufacture high-precision, good-quality molds, which cannot meet the processing requirements of single pieces and small batches.

The use of rapid prototyping technology to manufacture sand molds has the following disadvantages: layer-by-layer processing, low processing efficiency, and not suitable for processing large molds; binders or laser sintering will bond sand particles together to form a mold with a dense inner surface, poor air permeability, and castings Defects are prone to occur; layered processing will produce a step effect when processing some complex surfaces

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