| 摘要 |
PROBLEM TO BE SOLVED: To provide a vertical double head surface grinding machine having a clamp device capable of fixing/retaining a work at an exact fixing position in the stable state even when the shape of an upper surface of the work is complex and clamp the area is small. SOLUTION: The grinding machine is provided with a pair of upper and lower grinding wheels 2, 3 rotating around a vertical axis; a work retaining fixture 10 retaining the work W to a predetermined position and rotating itself; and a clamp device 12 pressing the work W to the work retaining fixture 10. Both upper and lower end surfaces are simultaneously surface-ground by inserting the work retained by the work retaining fixture 10 between both grinding wheels 2, 3. The clamp device 12 is provided with a pressing unit 23 rotatable around an axis O2 of self-rotation of the work retaining fixture 10 on a clamp rod 21 of a lifting cylinder 22 through a bearing 50. The pressing unit 23 has a steel ball abutting to a central recessed part of the upper surface of the work. COPYRIGHT: (C)2004,JPO
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