Evaporative pattern casting process preventing deformation

A technology of lost foam casting and craftsmanship, used in manufacturing tools, casting molding equipment, casting molds, etc., to achieve the effect of smooth surface, high precision and low cost

Inactive Publication Date: 2016-03-02
YIBIN JIUDING PRECISION CASTING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of lost foam casti

Method used

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Examples

Experimental program
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Embodiment Construction

[0016] The present invention will be further described in detail through specific implementation examples below.

[0017] A lost foam casting process for preventing deformation, comprising the following steps:

[0018] (1) Selection of foam plastic beads: expandable polystyrene resin beads are selected, and the particle size of the selected original beads is less than or equal to 1 / 9~1 / 10 of the minimum wall thickness of the casting;

[0019] (2) Model making: First, pre-foam the expandable polystyrene resin beads, and then place the pre-foamed expandable polystyrene resin beads in a dry and ventilated silo for aging. The cured expandable polystyrene resin beads are filled into the cavity of the metal mold, heated to make the beads expand again, fill the gaps between the beads, and make the beads fuse with each other to form a smooth surface, that is Model, finally cooling out of the mold;

[0020] (3) The models are combined into clusters: a raised structure is provided at ...

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PUM

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Abstract

The invention discloses an evaporative pattern casting process preventing deformation. The evaporative pattern casting process comprises the steps of 1, selecting plastic foam beads; 2, manufacturing models; 3, combining the models for cluster formation; 4, carrying out vibration molding; 5, carrying out casting forming; 6, taking out castings. According to the evaporative pattern casting process, the phenomenon that in the casting process of the evaporative pattern castings, because gaps are generated in the adhesion process of a plurality of mold sheets, the castings are deformed in the pouring process can be effectively avoided, deformation can be effectively prevented, and the qualification rate of products can be increased.

Description

technical field [0001] The invention relates to the technical field of lost foam casting, in particular to a lost foam casting process for preventing deformation. Background technique [0002] Lost foam casting (also known as solid casting) is made of foam plastic (EPS, STMMA or EPMMA) polymer material to form a solid mold with exactly the same structure and size as the part to be cast, after dipping refractory coating (strengthening , bright and clean, air-permeable) and dried, buried in dry quartz sand and subjected to three-dimensional vibration modeling, pouring molten metal into the casting mold sand box under negative pressure, so that the polymer material model is heated and gasified and drawn out, and then is cast Liquid metal replaces the one-time molding casting new technology formed after cooling and solidification to produce a new casting method for castings. [0003] The traditional sand casting process has to go through manufacturing model, manufacturing core ...

Claims

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Application Information

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IPC IPC(8): B22C9/04
Inventor 李思兵邓琳琅肖勇何开奎
Owner YIBIN JIUDING PRECISION CASTING CO LTD
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