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Process of fatigue-resistant cylinder cover

A process method and cylinder head technology, applied in the direction of improving process efficiency, manufacturing tools, furnaces, etc., can solve problems such as poor fatigue resistance of cylinder heads, and achieve the effects of eliminating residual stress, increasing performance, and increasing fatigue resistance.

Pending Publication Date: 2021-04-06
GUANGXI YUCHAI MASCH CO LTD
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Problems solved by technology

[0004] In order to make up for the above deficiencies, the present invention provides a process method for fatigue-resistant cylinder heads, aiming to improve the problem of poor fatigue resistance of cylinder heads produced by traditional processing methods

Method used

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  • Process of fatigue-resistant cylinder cover
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Embodiment

[0036]SeeFigure 1-2The present invention provides a method of processing a fatigue cylinder head comprising the steps of:

[0037]S1, workpiece preparation: Take the surface without cracking, scratch, and smashed finished gray cast iron cylinder head for processing workpiece, in the specific implementation, the material component of the finished gray cast iron cylinder head in this step S1 is: C: 3.00- 3.40%, Si: 1.95-2.15%, S: 0.05-0.1%, Mn: 0.5-0.8%, Cu: 0.5-0.3%, MO: 0.1-0.3%, CR: 0.15-0.4%, SN: 0.05-0.15 %, P <0.07%, using the above material to obtain a gray-cast iron cylinder head after casting according to production requirements, can be understood, and the workpiece to be processed in step S1 is selected for the finished gray cast iron cylinder head after production. The like-to-process workpiece is the likelihood of subsequent processing due to overall length of time.

[0038]S2, workpiece heating treatment: put the workpiece to be processed in step S1 to be used in the van furnac...

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Abstract

The invention provides a process of a fatigue-resistant cylinder cover, and belongs to the technical field of cylinder cover processing. The process of the fatigue-resistant cylinder cover comprises the following steps of: S1, workpiece preparation: taking a finished gray cast iron cylinder cover without cracks, scratches or collision damage on the surface as a to-be-processed workpiece; and S2, workpiece heating treatment, namely putting the to-be-processed workpiece selected in the step S1 into a chamber oven to be heated. An existing gray cast iron cylinder cover is heated at high temperature, and then the cylinder cover is cooled and quenched, so that the matrix structure of the gray cast iron cylinder cover is transformed into lower bainite, an original pearlite matrix structure is replaced with a lower bainite matrix structure, the performance of the material is improved, and meanwhile, the fatigue resistance of the gray cast iron cylinder cover is improved; and in addition, the cylinder cover is annealed and tempered, so that residual stress generated by the cylinder cover in the matrix transformation process is eliminated, and deformation of the gray cast iron cylinder cover is reduced.

Description

Technical field[0001]The present invention relates to the field of cylinder head processing, and in particular, a process method involving a fatigue cylinder head.Background technique[0002]The diesel engine cylinder head is in the upper side of the engine combustion zone, directly with combustion, withstanding the explosion and high temperature brought by the operation of the engine. In the entire cylinder head, the cylinder head is only partially pressed by the combustion zone of the fire surface, and at the same time, the cold thermal temperature difference of the cylinder head is incorporated, and there is a significant temperature difference. After the cylinder head is heat, cooling water must be quickly cooled to the cylinder head nose region to ensure that the temperature difference of the entire cylinder head is within a relatively stable range, but the cylinder head is still subject to changes in cold and heat, and the cylinder head is long-term treatment In the state, when ...

Claims

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Application Information

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IPC IPC(8): C21D9/00C21D5/00C21D1/20C21D1/30C22C37/10C22C37/06
CPCC21D9/0068C21D5/00C21D1/20C21D1/30C22C37/10C22C37/06C21D2211/002Y02P10/20
Inventor 李明何春华
Owner GUANGXI YUCHAI MASCH CO LTD
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