Abstract Herein disclosed is a continuous hydrostatic extrusion-drawing apparatus comprising a main body housing defining a wire passage, in which a working fluid under pressure is confined and through which a wire is made to continuously pass for extrusion and drawal at a high reduction ratio. The present apparatus further comprises a first die disposed at the inlet of said wire passage and formed with a bore having an effective diameter, which is smaller than that of a fed wire, a second die disposed at the outlet of said wire passage and formed with a bore having an effective diameter, which is smaller than that of the first-named die, pulling means disposed midway of said wire passage for continuously pulling the fed wire through the first-named die to such an extent as to overcome the back tension, which is exerted on the passing wire due to the difference in the effective diameter between the first- and second-named dies, and take-up means disposed outside of said main body housing for continuously pulling the once-pulled wire through the second-named die in synchronism with said pulling means to such an extent as to afford a predetermined front tension to said once-pulled wire and for concurrently taking up the twice-pulled wire thereon. The present apparatus can be appreciated not only in its capability of accomplishing continuous extrusion-drawing of a wire at a high reduction ratio but also in the resultant elongation of life time of the dies used. The apparatus can also be appreciated in its simplicity of handling and construction.
A continuous hydrostatic extrusion-drawing apparatus comprising: a main body housing defining therein a wire passage, in which a working fluid under pressure is confined and through which a wire to be extruded and drawn is made to pass; a first die disposed at the inlet of said wire passage and formed with a bore having an effective diameter which is smaller than that of a fed wire; a second die disposed at the outlet of said wire passage and formed with a bore having an effective diameter which is smaller than that of the first-named die; pulling means disposed within said working fluid midway of said wire passage and directly frictionally gripping said wire for continuously pulling the fed wire through thE first-named die to such an extent as to overcome the back tension which is exerted on the passing wire due to the difference in the effective diameter between the first- and second-named dies; and take-up means disposed outside of said main body housing for continuously pulling the once-pulled wire through the secondnamed die in synchronism with said pulling means and acting to such an extent as to afford a predetermined front tension to said once-pulled wire and for concurrently taking up the twicepulled wire thereon.
Claim 2
Dependent Claim
207 words
A continuous hydrostatic extrusion-drawing apparatus comprising: a main body housing defining therein a wire passage, in which a working fluid under pressure is confined and through which a wire to be extruded and drawn is made to pass; a first die disposed at the inlet of said wire passage and formed with a bore having an effective diameter which is smaller than that of a fed wire; a second die disposed at the outlet of said wire passage and formed with a bore having an effective diameter which is smaller than that of the first-named die; pulling means disposed within said working fluid midway of said wire passage and directly frictionally gripping said wire for continuously pulling the fed wire through thE first-named die to such an extent as to overcome the back tension which is exerted on the passing wire due to the difference in the effective diameter between the first- and second-named dies; and take-up means disposed outside of said main body housing for continuously pulling the once-pulled wire through the secondnamed die in synchronism with said pulling means and acting to such an extent as to afford a predetermined front tension to said once-pulled wire and for concurrently taking up the twicepulled wire thereon.
Claim 3
Dependent Claim
25 words
A continuous hydrostatic extrusion-drawing apparatus according to claim 1, wherein said pulling means includes at least one capstan on which the once-pulled wire is wound.
Claim 4
Dependent Claim
34 words
A continuous hydrostatic extrusion-drawing apparatus according to claim 1, further comprising fluid feed means for feeding the working fluid into said wire passage so as to maintain the pressure therein at a predetermined level.