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Method for improving yield of heat-resistant steel exhaust manifold investment castings

A technology of exhaust manifold and yield rate, which is applied in the direction of exhaust devices, casting molds, and casting mold components, etc., which can solve the problems of low exhaust manifold process yield, improve process yield, and increase riser compensation. The effect of shortening the distance

Inactive Publication Date: 2014-07-09
CHANGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, there has been an exploration of investment casting technology to produce automobile exhaust manifolds, but the production found that the production rate of heat-resistant steel automobile exhaust manifolds using the existing investment casting design scheme is low.

Method used

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  • Method for improving yield of heat-resistant steel exhaust manifold investment castings
  • Method for improving yield of heat-resistant steel exhaust manifold investment castings
  • Method for improving yield of heat-resistant steel exhaust manifold investment castings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Process Design of Exhaust Manifold in Existing Process Scheme

[0023] Place three risers on the bottom flange, and open gates at the converging ports of the four branch pipes. Riser volume is 78cm 3 ,Such as Figure 4 shown (unit: mm). The sprue volume is 958cm 3 ,Such as Figure 5 shown (unit: mm). The contact surface between the bottom flange and the riser of the obtained casting has shrinkage porosity and shrinkage cavity defects, and the process yield rate is 38.8%.

Embodiment 2

[0025] Technological design of the exhaust manifold of the technical scheme of the present invention

[0026] Place three risers on the bottom flange, and open gates at the converging ports of the four branch pipes. Riser volume is 126cm 3 ,Such as Figure 6 As shown (unit: mm), the volume of the sprue is 370cm 3 ,Such as Figure 7 shown (unit: mm). The contact surface between the bottom flange and the riser of the obtained casting has no shrinkage porosity and shrinkage cavity defects, and the process yield rate reaches 49.1%.

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Abstract

The invention relates to a method for improving the yield of heat-resistant steel exhaust manifold investment castings, which comprises the following steps: putting three risers on the flange side at the bottom of an exhaust manifold, and forming a casting head at the convergence port of four branch pipes of the exhaust manifold; and arranging exhaust pipes on the risers and connecting the exhaust pipes to the top of the pouring head. The method has the benefits that the process yield can be remarkably improved and is improved from the original 38.8 percent to 49.1 percent, and the relative improvement rate is close to 30 percent.

Description

technical field [0001] The invention belongs to the metal casting technology, and in particular relates to a process design scheme capable of improving the yield rate of investment casting castings of heat-resistant steel exhaust manifolds of automobile engines. 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. It is one of the eight main parts of the engine. The working efficiency of the entire exhaust system depends on the design and manufacture of the exhaust manifold. . [0003] At present, there are reports on the exhaust manifold casting process: the application number is 200610107204.0, and the invention name is "High nickel austenitic nodular cast iron automobile exhaust manifold and casting method" Chinese invention patent. In March 2009, "Numerical Simulation and Experimental Research on Sand Casting of Exhaust Manifold Based ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/08B22C9/22B22D25/00F01N13/10
Inventor 胡静方圆陈平
Owner CHANGZHOU UNIV