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Engine cylinder cover and preparation method thereof

A technology of engine cylinder head and isothermal quenching, which is applied to engine components, machines/engines, cylinder heads, etc., can solve the problem of poor thermal conductivity of vermicular iron, limit the lightweight design space of vermicular graphite cast iron cylinder head, vermicular graphite cast iron cylinder head Low thermal fatigue life and other problems, to achieve the effect of improving thermal fatigue life

Inactive Publication Date: 2021-08-31
DONGFENG COMML VEHICLE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] 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, only 200 times for the RuT350 material, and only 400 times for the RuT450 material, which limits the lightweight design space of the vermicular graphite cast iron cylinder head

Method used

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  • Engine cylinder cover and preparation method thereof
  • Engine cylinder cover and preparation method thereof
  • Engine cylinder cover and preparation method thereof

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preparation example Construction

[0028] The embodiment of the present application provides a kind of preparation method of engine cylinder head, and it comprises the steps:

[0029] Austenitization: heat the engine cylinder head blank cast from vermicular graphite cast iron to 880°C-960°C, and keep it warm for 1h-2.5h.

[0030] Austempering: quickly put the fully austenitized engine cylinder head blank into a salt bath furnace for isothermal quenching. The isothermal quenching temperature is 290°C to 360°C, and the isothermal quenching time is 1h to 2h, and then it is taken out from the salt bath. Air cool to room temperature after washing.

[0031] Processing: Machining the engine cylinder head blank to obtain the engine cylinder head.

[0032] In the austenitizing step, heat at a rate of 280°C / h to 350°C / h. If the temperature rises too fast, it will lead to uneven heating of the RuT350 engine cylinder head blank, large residual stress, and reduced thermal fatigue life. If it is too slow, it will take a lo...

Embodiment 1

[0040] A method for preparing an engine cylinder head, comprising the steps of:

[0041] Step 1) Material selection: select the RuT350 material that meets the requirements of the GB / T 9439-2010 standard.

[0042]Step 2) Casting: Sand casting is used to cast the required RuT350 engine cylinder head blank.

[0043] Step 3) Austenitization: heat the RuT350 engine cylinder head blank to 880°C, keep it warm for 1.5h, and the heating rate is 320°C / h.

[0044] Step 4) Austempering: under the protection of the atmosphere, quickly transfer the fully austenitized RuT350 engine cylinder head blank into a salt bath quenching furnace, control the quenching temperature to 290°C, keep it warm for 1.5h, and use the salt bath used for austenitization for NaNO 2 and KNO 3 , and NaNO 2 and KNO 3 The mass percentage of each is 50%, and then it is taken out from the salt bath, cleaned and air-cooled to room temperature.

[0045] Step 5) Machining: Rough machining and finishing machining are ...

Embodiment 2

[0048] A method for preparing an engine cylinder head, comprising the steps of:

[0049] Step 1) Material selection: select the RuT350 material that meets the requirements of the GB / T 9439-2010 standard.

[0050] Step 2) Casting: Sand casting is used to cast the required RuT350 engine cylinder head blank.

[0051] Step 3) Austenitization: heat the RuT350 engine cylinder head blank to 900°C, keep it warm for 1.5h, and the heating rate is 320°C / h.

[0052] Step 4) Austempering: under the protection of the atmosphere, quickly transfer the fully austenitized RuT350 engine cylinder head blank into a salt bath quenching furnace, control the quenching temperature to 290°C, keep it warm for 1.5h, and use the salt bath used for austenitization for NaNO 2 and KNO 3 , and NaNO 2 and KNO 3 The mass percentage of each is 50%, and then it is taken out from the salt bath, cleaned and air-cooled to room temperature.

[0053] Step 5) Machining: Rough machining and finishing machining are...

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Abstract

The invention relates to an engine cylinder cover and a preparation method thereof. The preparation method comprises the following steps: (1) austenitizing; (2) conducting isothermal quenching; and (3) machining. In the step (1), an engine cylinder cover blank formed by casting vermicular graphite cast iron is heated to 880 DEG C-960 DEG C, and the temperature is kept for 1-2.5 h; in the step (2), the completely austenitized engine cylinder cover blank is rapidly put into a salt bath furnace to be subjected to isothermal quenching, the isothermal quenching temperature ranges from 290 DEG C to 360 DEG C, the isothermal quenching time ranges from 1 h to 2 h, and then the engine cylinder cover blank is taken out of a salt bath, cleaned and air-cooled to the room temperature; and in the step (3), the engine cylinder cover blank is machined, and the engine cylinder cover is obtained. According to the engine cylinder cover and the preparation method thereof, the strength and the thermal fatigue life of the engine cylinder cover cast by the vermicular graphite cast iron can be improved.

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] As the requirements for energy saving and emission reduction are getting higher and higher, the demand for lightweight design of automobiles is increasing. As a key component in the engine, the diesel engine cylinder head is heavy, and it is the focus of lightweight design for product designers. object. Nowadays, there are two main directions for the lightweight design of diesel engine cylinder heads: 1. Structural optimization, under the premise of meeting performance requirements, some parts of the cylinder head are designed to reduce weight and thickness; 2. Material optimization, using higher strength material, and then carry out a thinner and lighter design for the cylinder head as a whole. Vermicular graphite cast iron contains m...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D1/20C21D1/26C21D5/00F02F1/24
CPCC21D9/0068C21D1/20C21D1/26C21D5/00B22D31/002F02F1/24C21D2261/00C21D2211/002C21D2211/001C21D2211/006F02F2200/06
Inventor 樊晓光余金科吴永强牛恩来赵俊平鲁福来
Owner DONGFENG COMML VEHICLE CO LTD
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