Machining head replacement type rotary tool, holder, and machining head

Abstract

A machining head replaceable rotating tool having a fastening male screw and a fastening female screw disposed on respective shaft centers of one and the other of a machining head and a holder, the fastening male and female screws being threadably engaged with each other to concentrically and removably attach the machining head to a tip portion of the holder, the machining head and the holder being disposed with abutting surfaces abutted against each other in a fastened state when the fastening male and female screws are threadably engaged, the machining head replaceable rotating tool being integrally and rotationally driven via the holder in a tool rotation direction causing the fastening male and female screws to be fastened by a machining load to perform predetermined machining with the machining head, the abutment of the abutting surfaces preventing the fastening male and female screws from being further fastened by a machining load, the fastening male and female screws being saw-tooth buttress screws having a following flank angle α smaller than a leading flank angle β.

Description

technical field [0001] The present invention relates to a processing head replaceable rotary cutter, in particular to a processing head replaceable rotary cutter in which a cutter bar and a processing head are integrated through a connecting external thread and a connecting internal thread, which can be easily disassembled and replaced. Technology for replacing processing heads. Background technique [0002] There is known a processing head replaceable rotary tool (refer to Patent Document 1), (a) the connecting external threads and the connecting internal threads respectively provided on the axes of one and the other of the processing head and the tool bar are screwed together, Thus, the processing head can be detachably mounted concentrically with respect to the front end portion of the tool holder. (c) the machining head replaceable rotary tool applies a machining load to the connecting external thread and the connecting internal thread through the tool holder on the abu...

AI Technical Summary

Problems solved by technology

In addition, when the tooth flanks on both sides are substantially vertical square threads, the possibility of welding the tooth flanks is low regardless of thermal expansion, but there is a problem that it is difficult to obtain sufficient mounting strength.

[0007] On the other hand, Patent Document 2 describes a technique in which, when the machining head is tapered to the tool holder, an auxiliary pin is screwed and detached from the opposite side of the machining head to push out the machining head. In the combined processing head exchangeable rotary tool, it is considered to use such a detachment assist pin, but even in this case, it may not be detachable

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