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Method for producing heat-resistant steel automobile exhaust pipes by iron mold sand lining process

A technology of automobile exhaust and sand-coating of iron molds, which is applied in the direction of manufacturing tools, metal processing equipment, casting molding equipment, etc., can solve the problems of high precision requirements of blanks, restrictions on the application of heat-resistant steel materials, and difficulties in meeting standards, etc., to achieve Improve the precision of castings, improve the yield and product quality, and ensure the effect of compactness

Active Publication Date: 2013-01-16
西峡县众德汽车部件有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most heat-resistant steel castings adopt the method of sand casting, which is often used in general heat-resistant steel casting products. Due to the large shrinkage of heat-resistant steel materials, sufficient molten steel must be used to make up for the shrinkage of cast steel, so generally Generally speaking, the output rate of cast steel products is low, and for some products with complex structures and high precision and quality requirements, this method has certain limitations
For the production of automobile exhaust pipes, due to its complex structure and high blank precision requirements, if heat-resistant steel materials are used, it is difficult to meet the standard with general sand casting technology, and the yield and yield are low, which limits heat-resistant steel. Application of material in automobile exhaust pipe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for producing heat-resistant steel automobile exhaust pipes by sand-covering iron molds:

[0033] 1. First analyze the profile and wall thickness characteristics of the automobile exhaust pipe, and preliminarily determine the chilling position in casting casting.

[0034] 2. Adjust the gap between the mold and the sand box according to the chilling position of the casting, and then determine the thickness of the sand shell and the precise chilling position. The overall thickness of the sand shell is 10mm, and the thickness of the sand shell that needs to be chilled is 3mm. , the thickness of the sand shell that needs heat preservation is 15mm.

[0035] 3. The sand box is heated by an infrared bottom radiation heating oven, wherein the heating temperature of the upper box is 200°C, and the heating temperature of the lower box is between 170°C, and the temperature of the upper box and the lower box are controlled by an electronic temperature controller. , and th...

Embodiment 2

[0046] A method for producing heat-resistant steel automobile exhaust pipes by sand-covering iron molds:

[0047] 1. First analyze the profile and wall thickness characteristics of the automobile exhaust pipe, and preliminarily determine the chilling position in casting casting.

[0048] 2. Adjust the gap between the mold and the sand box according to the chilling position of the casting, and then determine the thickness of the sand shell and the precise chilling position. The overall thickness of the sand shell is 10mm, and the thickness of the sand shell that needs to be chilled is 3mm. , the thickness of the sand shell that needs heat preservation is 15mm.

[0049] 3. Use an infrared bottom radiation heating oven to heat the sand box. The heating temperature of the upper box is between 220°C and the heating temperature of the lower box is between 180°C. The temperature of the upper box and the lower box are controlled by the electronic temperature controller. Control, and ...

Embodiment 3

[0060] A method for producing heat-resistant steel automobile exhaust pipes by sand-covering iron molds:

[0061] 1. First analyze the profile and wall thickness characteristics of the automobile exhaust pipe, and preliminarily determine the chilling position in casting casting.

[0062] 2. Adjust the gap between the mold and the sand box according to the chilling position of the casting, and then determine the thickness of the sand shell and the precise chilling position. The overall thickness of the sand shell is 8mm, and the thickness of the sand shell that needs to be chilled is 3mm. , the thickness of the sand shell that needs heat preservation is 12mm.

[0063] 3. Heat the sand box with an infrared bottom radiation heating oven, wherein the heating temperature of the upper box is between 180°C and the heating temperature of the lower box is between 140°C, and the temperature of the upper box and the lower box are controlled by the electronic temperature controller. Cont...

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Abstract

The invention discloses a method for producing heat-resistant steel automobile exhaust pipes by an iron mold sand lining process. The method includes modeling, core feeding, flask combining, casting, sand shakeout. Chilling position in casting of automobile exhaust pipes is determined before modeling. The special iron mold sand lining process is applied to production of heat-resistant steel, the characteristic that a sand shell cannot be separated from an iron mold during the modeling can be utilized, deformation of the sand shell is avoided, and accordingly precision of the casting is increased. Chilling points are controlled manually by controlling thickness of the sand shell, flasks of the iron mold can function in chilling and feeding sufficiently for places needed to be chilled, so that compactedness of the casting is guaranteed, product yield and quality are improved.

Description

technical field [0001] The invention relates to a production method of an automobile exhaust pipe, in particular to a production method of an automobile exhaust pipe made of heat-resistant steel. Background technique [0002] In recent years, with the rapid development of the automobile industry, consumers have higher and higher requirements for the overall performance of automobiles. Specifically for automobile exhaust pipes, the requirements for the precision, quality and high-temperature performance of the blank are becoming more and more stringent. , under the circumstances of all kinds of high requirements, some deficiencies of traditional craft methods are gradually highlighted. [0003] At present, most heat-resistant steel castings adopt the method of sand casting, which is often used in general heat-resistant steel casting products. Due to the large shrinkage of heat-resistant steel materials, sufficient molten steel must be used to make up for the shrinkage of cast...

Claims

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Application Information

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IPC IPC(8): B22C15/23B22C9/24
Inventor 田中青张启奎杨双杰张杰代浩
Owner 西峡县众德汽车部件有限公司
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