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A kind of engine cylinder head and preparation method thereof

An engine cylinder head and air-cooled technology, which is applied in the direction of manufacturing tools, heat treatment equipment, furnaces, etc., can solve the thermal conductivity of vermicular iron, limit the lightweight design space of vermicular graphite cast iron cylinder head, thermal fatigue of vermicular graphite cast iron cylinder head Low service life and other problems, to achieve the effect of improving thermal fatigue life

Active Publication Date: 2022-02-18
DONGFENG COMML VEHICLE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, due to the addition of more alloying elements in vermicular iron, the thermal conductivity of vermicular iron deteriorates. In addition, due to the prominent lightweight design of the vermicular cast iron cylinder head, the thickness of the nose bridge area of ​​the cylinder head is relatively thin. In actual production, it was found that vermicular graphite cast iron The thermal fatigue life of the cylinder head is low, and the RuT450 material is only 300 times, which limits the lightweight design space of the vermicular graphite cast iron cylinder head

Method used

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  • A kind of engine cylinder head and preparation method thereof
  • A kind of engine cylinder head and preparation method thereof
  • A kind of engine cylinder head and preparation method thereof

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preparation example Construction

[0032] A kind of preparation method of engine cylinder head that the embodiment of the present application provides, it comprises the following steps:

[0033] (1) Normalizing treatment: heat the engine cylinder head blank cast by alloy material to 850℃~950℃, and keep it warm for 1.5h~2.5h; then carry out air cooling, stop air cooling after cooling to ≤230℃, and finally Cool to room temperature;

[0034] (2) Tempering treatment: put the normalized engine cylinder head blank into the furnace for tempering treatment, the tempering temperature is 550℃~650℃, and the tempering time is 2~3h;

[0035] (3) After the tempering treatment is completed, shot peening and machining are performed in sequence to obtain the engine cylinder head.

[0036] In step (1), the alloy material can be HT300 or RuT450. If the holding temperature is lower than 850°C, or the holding time is lower than 1.5 hours, the engine cylinder head blank cannot be fully austenitized, which will affect the final nor...

Embodiment 1

[0043] A kind of preparation method of engine cylinder head that present embodiment provides, it comprises the following steps:

[0044] Step 1) Material selection: According to the requirements of the national standard GB / T 9439-2010, the common alloy gray iron HT300 material is selected.

[0045] Step 2) Casting: the raw materials are melted and then cast, and the required HT300 engine cylinder head blank is cast.

[0046]Step 3) Normalizing treatment: Put the cast HT300 engine cylinder head blank into a common heating furnace and heat it to 850°C, keep it warm for 2 hours, and then quickly air cool it after it comes out of the furnace, and the air cooling speed is 45°C / min. In order to ensure the cooling uniformity of the cylinder head, the fire surface and the back of the HT300 engine cylinder head blank are simultaneously blown and cooled. After cooling to 230°C, the air cooling is stopped and placed in the air to cool to room temperature.

[0047] Step 4) Tempering trea...

Embodiment 2

[0052] A kind of preparation method of engine cylinder head that present embodiment provides, it comprises the following steps:

[0053] Step 1) Material selection: According to the requirements of the national standard GB / T 9439-2010, the common alloy gray iron HT300 material is selected.

[0054] Step 2) Casting: the raw materials are melted and then cast, and the required HT300 engine cylinder head blank is cast.

[0055] Step 3) Normalizing treatment: Put the cast HT300 engine cylinder head blank into a common heating furnace and heat it to 870°C, keep it warm for 2 hours, and then quickly air-cool it after it comes out of the furnace, and the air-cooling speed is 75°C / min. In order to ensure the cooling uniformity of the cylinder head, the fire surface and the back of the HT300 engine cylinder head blank are simultaneously blown and cooled. After cooling to 230°C, the air cooling is stopped and placed in the air to cool to room temperature.

[0056] Step 4) Tempering tre...

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Abstract

The present application relates to an engine cylinder head and a preparation method thereof. The preparation method includes the following steps: (1) normalizing treatment: heating an engine cylinder head blank cast from an alloy material to 850°C to 950°C, and keeping the temperature for 1.5h ~2.5h; then air-cooled, cooled to ≤230°C, stopped air-cooled, and finally cooled to room temperature; (2) Tempering treatment: put the normalized engine cylinder head blank into the furnace for tempering treatment , the tempering temperature is 550℃~650℃, and the tempering time is 2~3h; (3) after the tempering treatment is completed, shot peening and machining treatment are carried out in sequence to obtain the engine cylinder head. The present application can improve the strength of the engine cylinder head cast with the alloy material, thereby improving the thermal fatigue life.

Description

technical field [0001] The application relates to the technical field of key engine components in the automobile manufacturing industry, in particular to an engine cylinder head and a preparation method thereof. Background technique [0002] The engine cylinder head is a key component of an automobile engine. During operation, the cylinder head is subject to high explosion pressure and thermal shock. Therefore, related technologies require the engine cylinder head to have good thermal conductivity and thermal fatigue performance. [0003] At present, the alloy materials commonly used in the manufacture of engine cylinder heads are gray iron and vermicular graphite cast iron. [0004] The gray iron material is used because it has good castability, thermal conductivity, shock absorption and lubricity. However, with the increase of engine power and explosion pressure, the surface of the engine cylinder head bears greater pressure, especially the pressure at the nose bridge of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/28C21D9/00C21D5/00
CPCC21D1/28C21D9/0068C21D5/00
Inventor 赵俊平牛恩来康明陈功军殷世福喻平
Owner DONGFENG COMML VEHICLE CO LTD
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