公开(公告)号：US3783663A

公开(公告)日：1974-01-08

申请号：US3783663D

申请日：1971-03-17

申请人： INST METALLURGII ZELEZA IMENI

发明人： PRAJSNAR T ,  SOJKA B ,  RULINSKI J ,  ZGLOBICKI E

IPC分类号： B21C3/00 ,  B21C3/16 ,  B21C9/00 ,  B21B45/02

CPC分类号： B21C3/00 ,  B21C3/16 ,  B21C9/00

摘要： A tubular workpiece, to be reduced in diameter and wall thickness, is drawn through a progressively narrowing gap formed between a die and a mandrel coaxial therewith, the die and the mandrel having confronting annular undercuts in an intermediate region of the gap whereby the latter is widened to form storage chambers for lubricant entrained under pressure by the inner and outer surfaces of the advancing workpiece. The lubricant is supplied to the outer storage chamber through a reservoir formed by a sleeve upstream of the entrance end of the die while being also funneled into the inner storage chamber through a narrowing clearance between the tail end of the mandrel and the workpiece. This clearance is surrounded by a converging first die section whose smallest diameter, preceding the undercut, is larger than the exit diameter of a converging second die portion in which the workpiece is shaped to its final dimension; the inner and outer workpiece surfaces are coated with films of lubricant leaving the respective storage chambers. The invention permits to introduction of the plug into the tube unconstrainedly and to obtention an optional small clearance beweeen the plug and the tube, whereby the drawing process operates under conditions of hydrodynamic lubrication. The method of drawing consists in bending the tube around the bearing part of the plug by means of a bearing-working tube drawing die situated immediately in ahead of the working tube drawing die which has a cross section reducing in co-operation with the plug and the tube wall. The plug for application of the method has an initial entry part in the form of a cone and a cylindrical-and-conical part serving for reduction of the tube-wall thickness, behind which a pressing part is situated with at least one pressure-regulating undercut being provided to maintain and to govern the pressure.

摘要翻译： 要减小直径和壁厚的管状工件通过模具和与其同轴的心轴之间形成的逐渐变窄的间隙被拉伸，模具和心轴在间隙的中间区域中具有相对的环形底切， 加宽形成用于在前进工件的内表面和外表面压力下夹带的润滑剂的储存室。 润滑剂通过由模具入口端上游的套管形成的储存器供给到外部储存室，同时通过心轴的尾端与工件之间的狭窄间隙也被漏斗进入内部储存室。 该间隙被收敛的第一模具部分围绕，其最小直径在底切之前大于会聚的第二模具部分的出口直径，其中工件成形为其最终尺寸; 内部和外部工件表面涂覆有离开各个储存室的润滑剂膜。

公开(公告)号：US3740990A

公开(公告)日：1973-06-26

申请号：US3740990D

申请日：1971-02-16

申请人： INST METALLURGII ZELEZA IMENI

发明人： PIASKOWSKI S ,  GODYN A ,  LACHETA I ,  SZCZEPANIK A ,  ZGLOBICKI E ,  LYZWINSKI R ,  PRAJSNAR T ,  RULINSKI J

IPC分类号： B21C3/00 ,  B21C3/14 ,  B21D37/16

CPC分类号： B21C3/14 ,  B21C3/00

摘要： A pressure drawing die designed for drawing wires, rods and tubes made of materials having varied mechanical properties, whereby use is made of the effect of hydrodynamic friction. The drawing die incorporates a system of dies with a pressure sleeve with hydrodynamic action. A cooling system is built into the drawing-die body or housing. The inlet portion of the pressure sleeve extends outside the body through the orifice in a pressure nut. Between dies a seal in a form of labyrinths and metal powders is provided. The working dies are provided with metal jackets which separate the die core from the pressure mounting.