Salt core of engine piston and making method thereof

An engine and salt core technology, applied in the direction of cores, manufacturing tools, casting and molding equipment, etc., can solve the problems of roughness that cannot meet the requirements of product design, complex shapes, etc., to improve water solubility, control shrinkage, and high strength. Effect

Active Publication Date: 2007-07-11
DONGFENG MOTOR CORP HUBEI
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  • Description
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Problems solved by technology

[0003] With the continuous development of the foundry industry, more and more castings need to cast cavities with complex shapes, and the requirements for the surface roughness and cleanliness of the cavities are getting higher and higher, such as the oil passage of the engine piston, while the traditional It is difficult to clean the sand core, and the roughness cannot meet the requirements of product design. This requires that the core used not only has high strength, high dimensional accuracy and reliability, but also has good water solubility. sex

Method used

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Experimental program
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Effect test

Embodiment Construction

[0026] The specific particle size distribution of water-soluble metal salts is shown in the table below:

[0027] Particle size (mm)

＞0.212

0.212～0.150

0.150～0.106

0.106～0.053

＜0.053

Content (%)

8.78

72.54

13.52

3.32

5.16

[0028] The combination of large particles and small particles can produce high-strength salt cores, but it is difficult to produce excellent salt cores with large or small particles alone.

[0029] There are many water-soluble metal salts currently used to make salt cores, and the selection criteria are to take into account the following properties: not melting within the pouring temperature range of a certain metal, not reacting with the metal, soluble in water and low in price . According to this standard, monovalent and divalent metal halides, monovalent metal chlorides, carbonates, sulfates, sulfites, nitrates and nitrites are more suitable as salt core materials. In order to be ab...

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Abstract

The invention relates to a plug salt corn of engine and relative production, wherein it is formed by 70-80% soluble metal salt and 20-30% findings; the salt grainness can reach 60-120 deals; the finding grainness should at least reach 200 deals. And the production comprises that: first breaking metal salt and findings into needed grainness, mixing them, putting some into powder compressing mould to obtain the blank; then putting blank into furnace to be baked; then processing the positioning hole. The inventive salt corn has high strength, while it can be washed by water.

Description

technical field [0001] The invention relates to an engine piston salt core and a preparation method thereof. Background technique [0002] With the application of engine dieselization and turbocharging technology, its output power is getting higher and higher, and the thermal load and mechanical load on the piston are also increasing. When the engine is working normally, the instantaneous working temperature of the combustion chamber can sometimes be as high as 2000K If the heat dissipation is not good, it will cause the top surface of the piston, especially the edge of the throat of the combustion chamber to be ablated, and eventually the phenomenon of cylinder scuffing will occur, resulting in the engine not working normally or being stuck. In order to solve the heat dissipation problem of the high-horsepower engine piston, the usual practice is to set an internal cooling oil passage on the head of the piston, and use a soluble salt core for molding. Foreign countries hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C5/00B22C9/10
Inventor 李楠
Owner DONGFENG MOTOR CORP HUBEI
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