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A thermal spraying preprocessing method and a cylinder block of an engine so preprocessed

A technology of engine cylinder and thermal spraying, which is applied in the direction of fusion spraying, honing machine tools, coating of superimposed layers, etc., which can solve the problems of rough surface of the substrate, weak resistance, and reduced reliability of thermal sprayed coatings, etc.

Active Publication Date: 2007-04-25
NISSAN MOTOR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this conventional process, the following problems arise: the processing time required for pre-thermal spray processing and the resulting investment expenditure (from cleaning to bond coating)
[0009] As disclosed in these patents, since one or more helical grooves are formed on the surface of the substrate by using a cutting tool, the adhesion of the thermally sprayed coating formed later has an effect on the force applied along the direction of the helical grooves. The resistance to force is weak; thus, the roughening of the surface of the substrate is insufficient, and sufficient adhesion of the entire thermal sprayed coating cannot be ensured, thereby reducing the reliability of the thermal sprayed coating

Method used

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  • A thermal spraying preprocessing method and a cylinder block of an engine so preprocessed
  • A thermal spraying preprocessing method and a cylinder block of an engine so preprocessed
  • A thermal spraying preprocessing method and a cylinder block of an engine so preprocessed

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Embodiment Construction

[0022] A description will now be given with reference to an embodiment of the method. While the claims are not limited to these examples, an appreciation of various aspects of the method is best obtained through a discussion of various examples of the method.

[0023] The manner in which the method is carried out is explained with reference to the accompanying drawings.

[0024] Fig. 1 is an explanatory diagram illustrating a series of processes of casting, roughening, and thermal spraying. As shown in FIG. 1, first, the inner surface of the cylinder block is formed by casting. Thereafter, the inner surface is roughened by the method described below, and then material is thermally sprayed onto the roughened surface.

[0025] FIG. 2 is a cross-sectional view of a processing roll inserted into a workpiece W, illustrating thermal spray pretreatment according to a first embodiment of the method.

[0026] This thermal spraying pretreatment method uses a working roller 3 made of ...

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Abstract

The adhesiveness of a thermal spray coating and a cylinder internal surface is improved by forming a sufficient roughened surface on an internal surface. A processing roller is installed on the main shaft of a processing device via a pressurizing mechanism. An uneven surface is provided on the external periphery of the processing roller. By pressing the processing roller against the internal surface while the roller rotates and moves, a fine unevenness that corresponds to the unevenness of the roller is formed on the cylinder internal surface. A thermal spray coating is formed on the internal surface where the inner surface has been roughened by forming the above-mentioned unevenness.

Description

[0001] related application [0002] Japanese Patent Application No. 2004-301983 filed on October 15, 2004 including specification, drawings and claims is hereby incorporated by reference in its entirety. technical field [0003] Disclosed herein are a thermal spraying pretreatment method for forming a roughened surface on an inner surface of a cylinder before forming a thermal sprayed coating and an engine cylinder block having a roughened surface formed by the method. Background technique [0004] Conventionally, as described in Japanese Laid-Open Patent No. 10-298733, when a material whose main component is iron is thermally sprayed on a cylinder bore of an aluminum cylinder block formed by casting, in the casting process Before thermal spraying treatment thereafter, flux (fluoride salt treatment) is coated on the cylinder bore and its dehydration is carried out by heating after cleaning in order to increase the adhesion (resistance) between the material and the inner surf...

Claims

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Application Information

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IPC IPC(8): C23C4/02B23P9/02
CPCC23C24/02B24B33/02C23C28/023B23P9/02C23C28/021C23C4/02C23C26/00C23C28/02Y10T29/49272
Inventor 关川岳饭泉雅彦荻野崇西村公男盐谷英尔高桥秀夫
Owner NISSAN MOTOR CO LTD
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