A thread forming screw for cold forming internal threads in a workpiece comprised of a low ductility material, such as magnesium and the like. The screw uses primarily compressive forces to form the internal threads in the workpiece. The screw has a shank (16) having an entering end and a head end. External threads (24) are disposed on the shank (16). The external threads (24) define a thread configuration with an angle (66) measuring substantially within the range of ninety degrees to one hundred and twenty degrees. <IMAGE>
申请公布号
DE69312335(D1)
申请公布日期
1997.08.28
申请号
DE1993612335
申请日期
1993.01.15
申请人
TEXTRON INC., PROVIDENCE, R.I., US
发明人
HERTEL, PAUL EDWARD, BELOIT, WISCONSIN 53511, US;SCHNEIDER, JAMES ROBERT, BELVIDERE, ILLINOIS 61008, US