| 摘要 |
<P>PROBLEM TO BE SOLVED: To machine a bore of a cylinder block with high roundness. <P>SOLUTION: A regulation member 30 is inserted to the inner periphery of a water jacket groove 4, thereby a bore circumferential wall 5 is supported from the outer diameter side by the regulation member 30. Therefore, the deformation of the bore circumferential wall 5 in the outer radial direction caused by pressure P in the outer radial direction in machining a bore inner peripheral surface 3a is regulated and reduction in roundness of a bore 3 can be prevented. <P>COPYRIGHT: (C)2013,JPO&INPIT |
