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Partition Control Method of Temperature Field in Special-shaped Cavity of Casting Mold

A temperature field and special-shaped technology, applied in the directions of casting mold composition, casting mold, casting molding equipment, etc., can solve the problems of difficult to install cold iron special-shaped cavity, insufficient sealing ability and air permeability, weak coating adhesion, etc. Improve the pass rate, improve the sealing ability, and the effect of strong heat transfer ability

Active Publication Date: 2019-07-02
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

However, when using this method to process castings, there are the following technical problems: weak coating adhesion, easy cracking, peeling off, insufficient sealing ability and air permeability between layers, not suitable for sand casting; only for thin-walled simple structures. It cannot solve the problem of abnormal shape with medium thickness of about 10mm, the deterioration of the microstructure and performance caused by the overheating of the melt after the intense heat filling of the complex structure, and the solidification problem of the special-shaped cavity that is difficult to install cold iron; the oxidant is not directly added, but relies on hydrolysis Reaction generation, multiple spraying processes are cumbersome and poor in operability; only a single oxidant is used, iron oxide has high density, easy to settle, and high cost; there is a risk of combustion during the oxidation and heat release process of magnesium powder

Method used

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  • Partition Control Method of Temperature Field in Special-shaped Cavity of Casting Mold
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  • Partition Control Method of Temperature Field in Special-shaped Cavity of Casting Mold

Examples

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Effect test

Embodiment 1

[0033] Partition control method for the temperature field of the special-shaped cavity of the casting mold (the casting is a thin-walled aluminum alloy embedded steel pipe structure with a wall thickness of 5mm, the material is ZL101A, and it is formed by gravity casting with a resin sand mold). 1. After trimming, at first use a soft brush to evenly and smoothly brush the primer on the cavity surface (the composition is shown in Table 1), the thickness of the brush is 200 μm, and the coating is dried and hardened by igniting the coating during the brushing process; In the thin-walled area, two kinds of coatings, the heating surface layer and the heating back layer, are sprayed sequentially (the compositions are shown in Table 2 and Table 3, respectively). 350mm, and evenly cover the previous coating, the spraying thickness is 120μm; after spraying, put the upper and lower molds in a drying oven at 150℃ and dry for 60min; after coming out of the furnace, the molds are combined, ...

Embodiment 2

[0047] Partition control method for the temperature field of the special-shaped cavity of the casting mold (the casting is a variable-section special-shaped shell with a height of 720mm and a wall thickness of 3-42mm, the material is ZL305, and it is formed by resin sand mold differential pressure casting), and the casting mold is divided into inner and outer molds. and multiple cores. After the molding and trimming are completed, first use a soft brush to brush the primer evenly and smoothly on the cavity surface (the composition is shown in Table 5). The thickness of the brush is 160 μm. The coating is dried and hardened; in addition to the area where the cold iron is easy to install, according to the wall thickness, the variable cross-section thin-wall area and the special-shaped dispersion heat joint area of ​​the cavity are divided into area A with a wall thickness of 3 mm ≤ 6 mm, and a wall thickness of 6 mm. - Area B of 15mm and area C of 15mm figure 2 The scheme shown ( ...

Embodiment 3

[0064] Partition control method for the temperature field of the special-shaped cavity of the casting mold (the casting is a complex box with a height of 540mm and a wall thickness of 10mm, the material is ZL205, and it is formed by low-pressure resin sand casting), and the casting mold is divided into inner and outer molds and multiple cores , after molding and trimming, first use a soft brush to evenly and smoothly brush the primer on the cavity surface (the composition is shown in Table 10), and the thickness of the brush is 160 μm. During the brushing process, the coating is dried and Hardening; secondly, in addition to the area where the cold iron is easy to install, according to the wall thickness, the variable cross-section thin-wall area and the special-shaped dispersion heat joint area of ​​the cavity are divided into area A with a wall thickness of 3 mm ≤ 6 mm and an area with a wall thickness of 6-10 mm. area B, and follow figure 2 The scheme shown ( figure 2 The...

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Abstract

The invention belongs to the technical field of casting, mold core or model surface coating ingredient selection, and particularly relates to a casting special-shaped cavity temperature field partition regulation and control method. The casting special-shaped cavity temperature field partition regulation and control method comprises the steps of prime paint coating, the step of partition coating and the step of drying. According to the wall thickness, a variable cross-section thin wall zone and a special-shaped radiating thermal center zone of a cavity are divided into a zone A with the wall thickness smaller than 6 mm, a zone B with the wall thickness being 6 mm-15 mm and a zone C with the wall thickness larger than 15 mm, only heat shock layer coating is sprayed to the zone A, cold shocklayer coating and heat shock layer coating are sprayed to the zone B in sequence, and only cold shock layer coating is sprayed to the zone C. By means of the method, melt long-flow mold filling is promoted, the solidification rate is increased, the casting texture and performance are obviously improved, the percent of pass is improved, the manufacturing cost is reduced, security and environmentalprotection are achieved, the application scope is wide, operation is easy and convenient, and the stability is good.

Description

technical field [0001] The invention belongs to the technical field of component selection of casting moulds, mold cores or mold surface coatings, and in particular relates to a method for regulating and controlling the temperature field of special-shaped mold cavities by partition. Background technique [0002] Sand casting refers to the casting method of producing castings in sand molds. Since the molding materials used in sand casting are cheap and easy to obtain, the mold preparation is simple, and it can adapt to single-piece production, batch production and mass production of castings, and the production efficiency High, widely used in the forming of light alloy components in aerospace, weapons, vehicles and other fields. [0003] With the development of lightweight equipment, a large number of casting materials are made of low-density aluminum alloy materials, and the structural design is developing towards an integrated, complex, and thin-walled trend. This type of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/02B22C3/00
CPCB22C3/00B22C9/02
Inventor 黄志伟赵高瞻陶健全万元元李明柴舒心李晓松邓天泉
Owner NO 59 RES INST OF CHINA ORDNANCE IND