Thread forming method, thread forming device, and thread forming tool
a b b. A thread forming device is provided with a thread forming tool for forming a thread portion at a frame , a first motor for controlling to rotate the thread forming tool , and a second motor for controlling to extract and retract the thread forming tool . Further, the thread forming tool is pr...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | a b b. A thread forming device is provided with a thread forming tool for forming a thread portion at a frame , a first motor for controlling to rotate the thread forming tool , and a second motor for controlling to extract and retract the thread forming tool . Further, the thread forming tool is provided with a pilot hole forming portion provided with a spiral groove at a front end portion in a taper shape, and a thread forming portion constituted continuously to the pilot hole forming portion and provided with a spiral groove |
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