THREAD FORMING TAP

WIPO Patent Application WO/2011/004455

A1

Disclosed is a thread forming tap wherein frictional torque or heat generation is reduced because the margin section is substantially 0 in connection with a shape near the top of a protrusion (δ=0°) to thereby decrease a contact area with a workpiece at the time of thread forming.  In a rough plastic deformation section separated from the top of a protrusion (δ=0°), the protrusion has an Archimedes curve shape where the amount of relief (R) changes linearly, while, in a finish plastic deformation section near the top, the shape of the protrusion is changed according to a quadratic curve.  Since variations in the amount of relief (R) decreases near the top where the a processing load is large, thread forming is carried out smoothly and thereby frictional torque or heat generation is reduced without sacrificing the durability of the protrusion.  Since frictional torque or heat generation is reduced without sacrificing the durability of the protrusion due to the reduction of margin and the special shape of the protrusion, the occurrence of welding or abrasion of or damage to the protrusion is minimized even when tapping is carried out under conditions susceptible to welding, e.g. high-speed processing, and thereby the lifetime of a tool is prolonged.

NORIMATSU KENTAROH (JP)
MATSUSHITA TAKAYUKI (JP)
YAMAMOTO HIRONORI (JP)

PCT/JP2009/062360

January 13, 2011

July 07, 2009

Click for automatic bibliography generation  

OSG CORP (JP)
NORIMATSU KENTAROH (JP)
MATSUSHITA TAKAYUKI (JP)
YAMAMOTO HIRONORI (JP)

B23G5/06

JP2004276085A	2004-10-07
JP2004148430A	2004-05-27
JPS3524741Y1
JP2006239858A	2006-09-14
JPS624556A	1987-01-10

IKEDA HARUYUKI (JP)
Haruyuki Ikeda (JP)

View/Download PDF      PDF Help

Previous Patent: OPERATION SUPPORT DEVICE, OPERATION SUPPORT METHOD, AND PROGRAM

Next Patent: SEAL DEVICE AND METHOD FOR REPLACEMENT OF SEAL FOR PROPELLER SHAFT OF MARINE VESSEL