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Investment casting method of heat-resistant steel exhaust manifold for automobile

An exhaust manifold and investment casting technology, which is applied in the field of investment casting, can solve the problems of many combined sand cores, prone to shrinkage porosity, and many loose sand cores, etc., and achieves improved product process yield and machining allowance. Reduced, good surface finish

Inactive Publication Date: 2013-02-13
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the complex structure of the exhaust manifold, it is difficult to type sand casting, there are many loose pieces of sand cores, and there are many combined sand cores, and the sand cores are completely surrounded by high-temperature molten iron, so it is difficult to discharge the gas.
Therefore, defects such as shrinkage porosity, shrinkage cavity, and porosity are prone to occur during the casting process.

Method used

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  • Investment casting method of heat-resistant steel exhaust manifold for automobile
  • Investment casting method of heat-resistant steel exhaust manifold for automobile

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The heat-resistant steel exhaust manifold of automobile engine adopts investment casting process and steps as follows:

[0028] 1. Manufacture of wax mold: using soluble urea core method,

[0029] The core manufacturing process is as follows:

[0030] 1) Core material: urea; 2) Molding method: free casting;

[0031] 3) Melting temperature: 150°C; 4) Mold temperature: 80°C; 5) Dissolving medium: water.

[0032] Wax mold making process is as follows:

[0033] 1) Wax model material: No. K-501 wax, 2) Wax melting temperature: 100°C; 3) Wax injection temperature: 70°C;

[0034] 4) Wax injection pressure: 60Kg / cm 2 ; 5) Holding time: 80S;

[0035] 6) Cooling water temperature: 25°C.

[0036] 2. Manufacture the shell:

[0037] 1) Degreasing and degreasing of modules

[0038] 2) Apply paint and sand on the module:

[0039] Before applying the paint, stir the paint evenly. After the paint is applied, sanding is carried out. Surface layer: silica sol with 320 mesh zirc...

Embodiment 2

[0048] The heat-resistant steel exhaust manifold of automobile engine adopts investment casting process and steps as follows:

[0049] 1. Manufacture of wax mold: using soluble urea core method,

[0050] The core manufacturing process is as follows:

[0051] 1) Core material: urea; 2) Molding method: free casting;

[0052] 3) Melting temperature: 100°C; 4) Mold temperature: 50°C; 5) Dissolving medium: water.

[0053] Wax mold making process is as follows:

[0054] 1) Use K-501 wax, 2) Wax melting temperature: 80°C; 3) Wax injection temperature: 50°C;

[0055] 4) Wax injection pressure: 20Kg / cm 2 ; 5) Holding time: 20S;

[0056] 6) Cooling water temperature: 5°C.

[0057] 2. Manufacture the shell:

[0058] 1) Degreasing and degreasing of modules

[0059] 2) Apply paint and sand on the module:

[0060] Before applying the paint, stir the paint evenly. After the paint is applied, sanding is carried out. Surface layer: silica sol with 320 mesh zirconium powder, dried fo...

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Abstract

The invention belongs to a metal casting technology and particularly relates to an investment casting method of a heat-resistant steel exhaust manifold for an automobile. The method comprises the steps of wax mould manufacturing, shell manufacturing, alloy smelting, pouring, shakeout and cleaning. The method has the benefits that the common defects of partial shrinkage, hole shrinkage and the like of the heat-resistant steel exhaust manifold for an automobile engine can be eliminated or reduced, and the process yield is higher.

Description

technical field [0001] The invention belongs to the metal casting technology, and in particular relates to an investment casting method which can eliminate or reduce common local shrinkage porosity and shrinkage cavity defects of automobile engine heat-resistant steel exhaust manifold castings. Background technique [0002] The automobile exhaust manifold is a component that collects the exhaust gas discharged from each cylinder of the engine and discharges it to the exhaust pipe. The structure is as follows: figure 1 , is one of the eight main components of the engine, and the efficiency of the entire exhaust system depends on the design and manufacture of the exhaust manifold. The structure of the exhaust manifold is complicated, the thickness of the pipe wall varies greatly, there are many isolated thermal joints, and it is difficult to place the riser, which brings great difficulty to the casting process. [0003] Retrieval of domestic exhaust manifold casting process p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C9/04B22C9/24
Inventor 胡静周吉祥陈平
Owner CHANGZHOU UNIV
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