Sand mould manufacturing assembly and casting method

A technology of sand casting and sand molding, which is applied in the field of sand mold manufacturing components and casting. It can solve the problems of casting air hole defects, inability to fix cold iron, and hinder gas discharge, so as to reduce the probability of air holes, delay the chilling effect, and improve airtight performance. Effect

Active Publication Date: 2017-06-13
CRRC CHANGZHOU AUTO PARTS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. The top of the turbine casing with a special structure is narrow and the cold iron cannot be fixed;
[0006] 2. A chilled iron is placed on the top of the turbine shell, which hinders the discharge of gas and causes pore defects in the casting, which affects the air tightness and pass rate of the casting.

Method used

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  • Sand mould manufacturing assembly and casting method
  • Sand mould manufacturing assembly and casting method
  • Sand mould manufacturing assembly and casting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: Shrinkage defects will occur during the casting process. The so-called shrinkage porosity means that there is no liquid metal or alloy feeding in the final solidified area of ​​the casting to form dispersed and fine shrinkage holes. The quality of forming castings, shrinkage porosity generally occurs in the axial area of ​​the casting wall, hot joints, thick parts, riser roots and near the inner gate, and often distributed below the concentrated shrinkage holes. In the prior art, the method of designing the riser and placing the chilled iron is usually used to solve the shrinkage porosity. The riser is used to place the liquid metal supplement, and the chilled iron is used to increase the local cooling rate of the casting, so that the entire casting is close to solidification at the same time. However, in the case of using chilled iron, gas will flow upward in the casting melt. Therefore, if the chilled iron is placed above the casting, the gas cannot be melte...

Embodiment 2

[0052] Example 2: The example of the present invention provides a sand mold manufactured by using the sand mold manufacturing component in Example 1. The casting cavity made of raw sand, binders and other auxiliary materials in foundry production is called a sand mold. See Figure 5 and Image 6 , the cavity of the sand mold includes a main cavity 8 and an exhaust channel 6, the main cavity 8 is formed by the area of ​​the mold body 3 before demolding, and the exhaust channel 6 is formed by the area of ​​the positioning column 1 before demolding Formed, the cold iron 4 is located above the main cavity 8, the surface of the cold iron 4 opposite to the main cavity 8 is formed with a sand coating 7, and the exhaust passage 6 connects the main cavity 8 with the cold iron. The through holes of the iron 4 communicate with each other, and the exhaust channel 6 is used to discharge the gas in the sand casting process.

[0053] A hole is formed on the sand mold in the area of ​​the su...

Embodiment 3

[0055] Embodiment 3: The embodiment of the present invention provides a casting method, and the method flow includes:

[0056] S1. Making a sand mold, the specific steps include:

[0057] S101. Preparation of molding sand.

[0058] Specifically, the preparation process of the molding sand is as follows: mixing quartz sand, hawthorn, magnesia, clay, coal powder, starch and water, and stirring evenly; then adding a binder and a hardener, mixing, and stirring evenly to obtain the ready-to-use molding sand;

[0059] S102. Fill the molding sand into the sand box, put the above components into the sand box, and then perform a compaction operation on the molding sand.

[0060] Specifically, the jarring compaction molding machine can be used to compact the molding sand in the sand box. The filled part is the main body 5 of the sand mold;

[0061] And a gate and a riser for feeding are set in the sand box. The gate is a feeding port, a narrow passage between the runner and the cavi...

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Abstract

The invention discloses a sand mould manufacturing assembly and a casting method and belongs to the field of casting. The sand mould manufacturing assembly comprises a mould main body, a chiller, a locating pillar and multiple support pillars, wherein the locating pillar is fixed to the upper surface of the mould main body. A through hole is formed in the chiller. The chiller is arranged at the outer side of the locating pillar in a sleeving manner through the through hole. The bottom of the chiller is supported by the support pillars. A space for sand coverage is formed between the chiller and the mould main body. Coverage sand is used for delaying chilling of the chiller when sand mould casting is conducted so that gas can be exhausted in the casting process. The upper end of the locating pillar is flush with a through hole opening of the chiller or extends out of the through hole. By means of a sand mould manufactured through the sand mould manufacturing assembly, the chilling effect of the chiller and the gas exhausting effect of the through hole in the chiller can be achieved conveniently in the casting process; the shrinkage porosity defect and the air hole defect of a casting obtained through manufacturing can be avoided; air tightness of the casting is improved, and the production qualification rate of the casting is increased.

Description

technical field [0001] The invention relates to the field of casting, in particular to a sand mold manufacturing component and a casting method. Background technique [0002] Sand casting is a casting method that produces castings in sand. Steel, iron and most non-ferrous alloy castings can be obtained by sand casting. As the basic process in casting production, it has the advantages of low cost, simple production process and short production cycle compared with other casting methods. The casting industry of components is more and more widely used. However, various casting defects such as shrinkage porosity often occur in the production process of sand castings. The generation of shrinkage porosity is related to the condensation rate of the casting. When the crystallization temperature range of the casting alloy is wide, after the casting surface is crusted , There is a wide solidification area in the casting where liquid and solid coexist. In the later stage of solidifica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/02B22D27/04B22D15/00
CPCB22C9/02B22D15/00B22D27/04
Inventor 陈呈祥
Owner CRRC CHANGZHOU AUTO PARTS CO LTD
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