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Cylinder bore and method for producing the same

A manufacturing method and cylinder bore technology, applied to cylinders, cylinder heads, engine components, etc., can solve problems such as product quality degradation and deformation, and achieve the effects of product quality, crack prevention, and deformation suppression

Inactive Publication Date: 2011-10-12
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the above method is applied to components such as cylinder bores that require high roundness, deformation will occur, resulting in a decrease in the quality of the product

Method used

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  • Cylinder bore and method for producing the same
  • Cylinder bore and method for producing the same
  • Cylinder bore and method for producing the same

Examples

Experimental program
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Effect test

Embodiment

[0037] Hereinafter, the present invention will be described in more detail with reference to specific examples. In the examples, a cylinder bore having a sliding surface was formed by boring a cylinder block obtained by casting using the same method as in the embodiment. Next, plastic working was performed on the sliding surface of the cylinder bore using a buff roll method. The obtained samples were evaluated for surface roughness control and cylindricity to study optimal conditions for plastic working.

[0038] 1. Embodiment 1 (evaluation of surface roughness control)

[0039] In Example 1, evaluation of surface roughness control was performed. In the boring process, a plurality of cylinder bores with approximately the same surface roughness were obtained, and in the plastic working of the cylinder bores, the amount of polishing was changed, and the surface roughness Ra (μm) of the cylinder bores before and after plastic working was studied. The relationship between the...

Embodiment 2

[0043] 2. Embodiment 2 (evaluation of cylindricity)

[0044] In Example 2, evaluation of cylindricity was performed. In the boring process, a cylinder block having a cylinder bore with approximately the same surface roughness was obtained. In the plastic working of the cylinder bore, the amount of polishing was changed to obtain the cylindricity (μm) and The relationship between the amount of polishing (μm) and the evaluation of cylindricity was carried out. It should be noted that the polishing amount is defined as the maximum value of the difference between the bore diameter of the cylinder bore before plastic working and the bore diameter of the cylinder bore after plastic working. Such as Figure 5 As shown, the cylindricity is defined as the difference between the maximum value R1 and the minimum value R2 of the bore diameter of the cylinder bore after plastic working.

[0045] Specifically, the cylindricity was evaluated for the following forms: the form for which o...

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Abstract

A method for a cylinder bore having a sliding surface which slides with respect to a counter member includes forming the sliding surface on a molded block by a boring processing with respect to the molded block, crushing cavities at the sliding surface and in the vicinity thereof by plastic working after the boring processing, smoothing the sliding surface, and forming a coating having seizure resistance on the sliding surface after the plastic working.

Description

technical field [0001] The present invention relates to a cylinder bore (Cylinder Bore) used in the engine field and a manufacturing method thereof, in particular to the improvement of a sliding surface (folding surface). Background technique [0002] The cylinder bore has a sliding surface that slides against the piston with an oil film interposed therebetween. For the sliding surface, for example, for the main purpose of securing an oil film to improve seizing resistance and wear resistance, groove shapes such as Cross Hach are formed by honing, and a coating is formed on the surface of the groove shape. Furthermore, the technique of forming a plated film as a coating film using a wet plating method such as a Ni—SiC plating method in which SiC particles are dispersed in Ni metal has been put into practical use. [0003] Various improvements have been made to such sliding surfaces. For example, in the technique of JP-A-2005-69008, a DLC film (Diamond-Like Carbon) having e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02F1/00
CPCB23P9/02F02F1/20Y10T29/49231
Inventor 小林幸司
Owner HONDA MOTOR CO LTD