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Stress relief of mechanically roughened cylinder bores for reduced cracking tendency

A technology for stress relief and cylinder bores, which is applied to mechanical equipment, cylinders, cylinder heads, etc., and can solve problems such as poor performance and durability of thermal spray coatings

Active Publication Date: 2016-09-14
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This in turn can lead to high tensile stresses and concomitant shear loads between the substrate and subsequently applied coatings in the axial and tangential directions of the pores, wherein such stresses and associated loads lead to cracks, which in particular detrimental to the performance and durability of thermal spray coatings

Method used

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  • Stress relief of mechanically roughened cylinder bores for reduced cracking tendency
  • Stress relief of mechanically roughened cylinder bores for reduced cracking tendency
  • Stress relief of mechanically roughened cylinder bores for reduced cracking tendency

Examples

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Embodiment Construction

[0047] first reference figure 1 , shows a simplified diagram of a block 100 of a four-cylinder automotive internal combustion engine. The block 100 comprises (among others): crankcase 110, crankshaft bearings 120, camshaft bearings 130 (with overhead valves and pushrods in the case of an engine), water cooling jacket 140, flywheel housing 150 and cylinders hole 160. These holes 160 may include an alloy surface layer (not shown) formed integrally with the base of each hole 160, or as a separate insert or sleeve sized to fit securely therein. In one form, such an alloy surface layer can be used to enhance the corrosion resistance, wear resistance or heat resistance of the hole 160 . In fact, in engine construction, the airframe 100 is cast from a lightweight material, such as aluminum and its alloys (such as A380, A319 or A356), the addition of such surface layers as conferring additional heat and wear resistance approach has traditionally been considered necessary. In one f...

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PUM

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Abstract

The invention discloses stress relief of mechanically roughened cylinder bores for reduced cracking tendency. A method of treating the surface of an aluminum-based engine block cylinder bore that has been mechanically roughened is disclosed. In one form, this method includes using vibratory stress relief, elevated temperature stress relief or cryogenic stress relief so that residual stresses imparted to the surface by the roughening process are reduced. In this way, a protective coating that is also applied to the bore surface will exhibit better adhesion and lower incidence of stress-induced or fatigue-induced cracking.

Description

[0001] This application claims priority to US Provisional Application 62 / 126,807, filed March 2, 2015. technical field [0002] This invention relates generally to achieving better adhesion between protective coatings and target substrates, and in particular to creating a frictionally compliant surface in engine cylinder bores by mechanically roughening the bore so that internal stresses in the bore and The resulting cracks in the subsequently applied thermal sprayed coating are reduced. Background technique [0003] The cylinder walls and cylinder liners of internal combustion engines (ICEs) are machined to exacting standards with tight tolerances as a means of facilitating efficient engine operation. While additional increases in efficiency can also be achieved through a hotter, more complete combustion process, the increased heat load delivered to the walls and liners of the engine block (also collectively and individually referred to as bores) places a heavy burden on th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P9/00C21D1/00C21D10/00C23C4/02F02F1/22
CPCB23P9/00C21D1/00C21D10/00C23C4/02F02F1/22C22F1/04C22F1/002C22F3/00F02F1/00F02F2001/008F02F2200/06
Inventor Y.王M.S.克拉默
Owner GM GLOBAL TECH OPERATIONS LLC
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