Patent ID: 6735994
Filing Date: 2004-05-18
Classification: B21F,B21J,B21K,E04C

Abstract:
Apparatus for cold forging of metal workpiece of varying diameter, said apparatus comprising:(i) two opposed dies; (ii) each said die having a first die part and a second die part; (iii) said second die part being enlarged relative to the first die part, whereby to form stress alleviating means for alleviating stress to the workpiece during cold forging; (iv) a pressure applying means; (v) the second die part being adapted to allow part of the workpiece to project therefrom, whereby said projecting part of the workpiece is upset by the pressure applying means and enlarged during cold forging; (vi) adjusting means for adjusting the distance of said projecting part of the workpiece beyond said second die part; (vii) means for providing for a uniform forging pressure by the pressure applying means for varying diameters of workpiece during forging; and (viii) control means for automatic control of said pressure, said control means including a sensor acting to ensure that there is no need to adjust the pressure applied whatever the diameter of the workpiece.