Title:
ボールスタッドを製造するための冷間変形法
Document Type and Number:
Japanese Patent JP2007512961
Kind Code:
A
Abstract:
A cold forming process for manufacturing ball pivots with a ball area, a cone area and a thread area for installation in ball and socket joints by cold forming is presented, in which a ball pivot blank (1) with a shaped cone area (3) and cylindrical areas for the thread (2) and the ball (5) is manufactured at first from a bar-shaped semifinished bar stock by extrusion. The extrusion operation is followed by the forming of the ball area as another manufacturing step by means of a rolling processes. At the same time, the thread area can be formed in its final shape. Thus, the ball pivot is manufactured as a whole by cold forming only and it makes it possible to significantly increase the production output per unit of time compared to the processes known from the state of the art. At the same time, it is possible to use less expensive grades of steel, because sufficient fatigue strength of the ball pivot can be guaranteed by the cold forming.
Inventors:
Jochen Kruse
Claus Rosenberger
Claus Rosenberger
Application Number:
JP2006540160A
Publication Date:
May 24, 2007
Filing Date:
November 25, 2004
Export Citation:
Assignee:
ZF Friedrichshafen AG
International Classes:
B21H1/14; B21H1/00; B21H1/18; B21H3/02; B21H3/04; B21H3/06; B21H7/18; B21K1/02; B21K1/76; B23P15/00; F16C11/06
Attorney, Agent or Firm:
Toshio Yano
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel
Toshiomi Yamazaki
Takuya Kuno
Einzel Felix-Reinhard
Reinhard Einsel