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Technology for machining automobile engine end cover

An automotive engine and processing technology, applied in metal processing equipment, manufacturing tools, electrolytic coatings, etc., can solve the problems of low dimensional accuracy, low strength, and low surface hardness, and achieve low surface roughness, good quality, and mechanical properties. Good results

Active Publication Date: 2014-06-25
NINGBO DONGHAO DIE CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the general aluminum alloy automobile engine end cover generally has problems such as low strength, low surface hardness, and low dimensional accuracy.

Method used

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  • Technology for machining automobile engine end cover

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Melt the aluminum alloy of the end cover of the automobile engine at 720°C for 70 minutes to form aluminum liquid, stir it evenly, pass nitrogen gas into it for degassing and refining, let it stand for 15 minutes after refining, and then remove the slag;

[0030] Preheat the die-casting mold to 330°C, paint, insert the core, and fill the aluminum liquid after slag removal into the die-casting mold cavity at a filling speed of 40m / s. The filling time is 0.10s, and then the pressure is 65MPa, molded under the condition of 710°C, hold the pressure for 10s, open the mold, and pull the core to obtain the casting. The mold opening time is 200s, wherein the coating is made of 10% by mass of chalk powder, 6% of asbestos powder, 28% graphite powder, 8% titanium dioxide, 8% zinc oxide, 15% water glass, and the rest is mixed with water;

[0031] After the obtained casting is cleaned and removed from the handle and burrs, shot blasting and electrophoretic coating are carried out su...

Embodiment 2

[0034] Melt the aluminum alloy of the end cover of the automobile engine at 700°C for 60 minutes to form aluminum liquid. After stirring evenly, nitrogen gas is introduced for degassing and refining. After refining, stand still for 10 minutes before removing slag;

[0035] Preheat the die-casting mold to 300°C, paint, insert the core, and then fill the aluminum liquid after slag removal into the die-casting mold cavity at a filling speed of 30m / s. The filling time is 0.01s, and then the pressure is 60MPa, molding under the condition of 700°C, mold opening and core pulling after holding the pressure for 8s, the mold opening time is 180s, wherein the coating is composed of 8% by mass percentage of chalk powder, 8% asbestos powder, 35% graphite powder, 6% titanium dioxide, 6% zinc oxide, 18% water glass, and the balance is mixed with water;

[0036] After the obtained casting is cleaned and removed from the handle and burrs, shot blasting and electrophoretic coating are carried o...

Embodiment 3

[0039] Melt the aluminum alloy of the end cover of the automobile engine at 730°C for 80 minutes to form aluminum liquid. After stirring evenly, nitrogen gas is introduced for degassing and refining. After refining, stand for 20 minutes and then remove slag;

[0040] Preheat the die-casting mold to 350°C, paint, insert the core, and then fill the aluminum liquid after slag removal into the die-casting mold cavity at a filling speed of 50m / s. The filling time is 0.15s, and then the pressure is 70MPa, molded under the condition of 720°C, mold opening and core pulling after holding pressure for 11s, the mold opening time is 220s, wherein the coating is made of 12% chalk powder, 8% asbestos powder, 20% graphite powder, 12% titanium dioxide, 12% zinc oxide, 12% water glass, and the balance is mixed with water;

[0041] The obtained casting is cleaned and removed from the feed handle and burr, and then shot blasting and electrophoretic coating are carried out successively. In the de...

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Abstract

The invention relates to a technology for machining an automobile engine end cover, and belongs to the technical field of alloy materials. The machining technology comprises the following steps that firstly, aluminum alloy of the automobile engine end cover is smelted into molten aluminum, the molten aluminum is stirred evenly, and then degassing and refining are carried out; secondly, a die-casting die is preheated and coated, a mold core is inserted into the die-casting die, a die-casting die cavity is filled with the refined molten aluminum at a high speed, forming is achieved under the high pressure, and a casting is obtained through die sinking and core drawing; thirdly, the obtained casting is cleaned, a charge handle and burrs are removed, and then the shot blasting and electrophoresis coating are carried out in sequence; fourthly, the casting on which the electrophoresis coating is carried out is turned, remachined and drilled in sequence, and then the automobile engine end cover is obtained at last. According to the technology for machining the automobile engine end cover, the material utilization ratio is high, energy consumption and production cost are low, the machining technology is simple, the atmosphere pollution and environment damage are small, the environment protection requirement is met, the strength, surface hardness and size precision of the machined automobile engine end cover are high, and the surface roughness is low.

Description

technical field [0001] The invention relates to a processing technology of an automobile engine end cover, belonging to the technical field of alloy materials. Background technique [0002] As the heart of the car, the engine provides power for the running of the car. Simply put, the engine is an energy conversion mechanism. Its basic principle is to convert the thermal energy of gasoline (diesel) into mechanical energy by pushing the piston to do work when the combustion gas expands in the sealed cylinder. The engine has been with the car for more than 100 years. It has been greatly improved in terms of design, manufacturing, technology, performance and control, but its basic principle remains the same. With the continuous development of technology, design engineers continue to Integrate the latest technology with the engine, turn the engine into a mechatronic product, and continuously improve the performance of the engine. [0003] The automobile engine end cover is an i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D17/00B23P15/00B22C3/00C25D13/12
Inventor 陈光圆杨文浩张意斌杨乾恩
Owner NINGBO DONGHAO DIE CASTING