| 摘要 |
PURPOSE:To increase the strength on the shaft side of a grinding wheel proper by making the outside circumferential part of a bearing metal fit hole of a work for grinding wheel with a greater wall thickness, and compressing into a specified thickness through forced fitting of said greater wall thickness part. CONSTITUTION:In the case of a straight type grinding wheel, material for grinding wheel in which magnetic particles are jointed by a bonding agent such as plastics of carbolic acid type, is formed disc-shaped with a specific outside diameter and in such a way as having a protrusion 2 in the form of a truncated conocal cylinder at the outside circumference of a bearing metal fit hole 1, so as to form a work 3 for grinding wheel. Then this work 3 is set in a lower die 15 to a protruding plateau 2 upward, followed by operation of the press machine, and the upper part of a guide shaft 7 is sunk while sliding in a shift sliding hole 8 of the upper die 10 so as to compress into a straight form with specified thickness. Thereby a grinder element 17 in which the outside circumference of the bearing metal fit hole 1 has higher density than its periphery, is formed and this is heated and baked to manufacture a grinding wheel proper 18. Accordingly the strength is higher on the shaft side of grinding wheel proper 18, which prevents failure to be caused by shocks etc. in service.
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