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Manufacturing method of restrictor of engine

A throttle and engine technology, applied in the field of auto parts, can solve the problems of low casting yield, poor valve rigidity, unsatisfactory wear resistance, etc., and achieve the effect of high casting qualification rate, good compactness, and small tendency to loosen.

Inactive Publication Date: 2016-06-15
陈焕道
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it has the disadvantages of low casting yield, poor hardness of the valve, unsatisfactory heat resistance and wear resistance.

Method used

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  • Manufacturing method of restrictor of engine
  • Manufacturing method of restrictor of engine
  • Manufacturing method of restrictor of engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for preparing an engine throttle includes the following steps:

[0025] (1) Make fusible molds and mold shells according to the size of the throttle;

[0026] (2) Baking the shell at 800℃ for 2h;

[0027] (3) Coating metal aluminum on the inner surface of the mold shell, the temperature of the coating film is 800°C, and the cooling method is air cooling;

[0028] (4) Configure molten alloy as required, and inject it into the mold shell to obtain a cast body;

[0029] (5) Normalizing and tempering the casting body, and natural cooling;

[0030] (6) The surface of the casting body is oxidized by the discharge oxidation method to obtain a dense aluminum oxide film;

[0031] (7) The casting body is polished to obtain semi-finished products by fine polishing;

[0032] (8) The semi-finished product is subjected to secondary normalizing and tempering in a box-type resistance furnace to obtain a finished product.

[0033] In the step (5) and step (8), the normalizing temperature is ...

Embodiment 2

[0040] A method for preparing an engine throttle includes the following steps:

[0041] (1) Make fusible molds and mold shells according to the size of the throttle;

[0042] (2) Baking the shell at 900℃ for 5h;

[0043] (3) Coating metal aluminum on the inner surface of the mold shell, the temperature of the coating film is 1000°C, and the cooling method is air cooling;

[0044] (4) Configure molten alloy as required, and inject it into the mold shell to obtain a cast body;

[0045] (5) Normalizing and tempering the casting body, and natural cooling;

[0046] (6) The surface of the casting body is oxidized by the discharge oxidation method to obtain a dense aluminum oxide film;

[0047] (7) The casting body is polished to obtain semi-finished products by fine polishing;

[0048] (8) The semi-finished product is subjected to secondary normalizing and tempering in a box-type resistance furnace to obtain a finished product.

[0049] In the step (5) and step (8), the normalizing temperature is...

Embodiment 3

[0056] A method for preparing an engine throttle includes the following steps:

[0057] (1) Make fusible molds and mold shells according to the size of the throttle;

[0058] (2) Baking the shell at 850℃ for 3h;

[0059] (3) Coating metal aluminum on the inner surface of the mold shell, the temperature of the coating film is 900°C, and the cooling method is air cooling;

[0060] (4) Configure molten alloy as required, and inject it into the mold shell to obtain a cast body;

[0061] (5) Normalizing and tempering the casting body, and natural cooling;

[0062] (6) The surface of the casting body is oxidized by the discharge oxidation method to obtain a dense aluminum oxide film;

[0063] (7) The casting body is polished to obtain semi-finished products by fine polishing;

[0064] (8) The semi-finished product is subjected to secondary normalizing and tempering in a box-type resistance furnace to obtain a finished product.

[0065] In the step (5) and step (8), the normalizing temperature is ...

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Abstract

The invention particularly relates to a manufacturing method of a restrictor of an engine. The manufacturing method comprises the following steps: (1) manufacturing a fusible mold according to the size of the restrictor and manufacturing a mold case; (2) roasting the mold case at the temperature of 800-900 DEG C for 2-5 hours; (3) coating the surface of the inner side of the mold case with aluminum, wherein the coating temperature is 800-1,000 DEG C, and a cooling mode is air cooling; (4) configuring molten alloy according to requirements, and injecting the molten alloy into the mold case to obtain a casting; (5) normalizing and tempering the casting, and naturally cooling; (6) oxidizing the surface of the casting by using a discharge oxidation method to obtain a compact aluminum oxide film; (7) grinding the casting in a fine grinding mode to obtain a semi-finished product; and (8) secondarily normalizing and tempering the semi-finished product in a chamber electric furnace to obtain a finished product. The manufacturing method of the restrictor of the engine is simple in technology and low in equipment investment, and meanwhile, an engine valve which is good in wear resistance and large in hardness range can be obtained.

Description

Technical field [0001] The invention belongs to the technical field of auto parts, and specifically relates to a method for preparing an engine throttle. Background technique [0002] The throttle valve is a controllable valve used to control the air entering the engine. After entering the intake pipe, it is mixed with gasoline (different models of cars have different design mixing parts) to become a combustible mixture and participate in combustion work. Four-stroke gasoline engines generally look like this. The throttle is the most important part of the engine system of today's electronic fuel injection vehicles. Its upper part is the air filter, and the lower part is the engine block, which is the throat of the automobile engine. At present, the throttle valves used in automobile engines are generally made of chromium-molybdenum alloy (wherein the content of molybdenum is generally less than 2.5%), and the use of investment lost wax casting is characterized by high dimensiona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C38/18C22C38/02C22C38/04C21D1/28F02D9/08
CPCC22C38/12C21D1/28C21D2211/008C21D2211/009C22C38/02C22C38/04C22C38/18F02D9/08
Inventor 陈焕道
Owner 陈焕道
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