Hot metal extru-bending machine

Abstract

This invention relates to the extru-bending machine that can bend product by extruding two or more hot metal billets with the machine which consists of an extrusion die holder equipped with conical dies, container holder heating the two or more-holed container with conical plug, two or more extrusion stems, hydraulic power system unit, relative velocity control unit, and support frame structure. It is characterized that, when two or more hot metal billets are welded together inside a conical die cavity and extruded to one product at the die exit, the extru-bending machine can bend the extruded part simultaneously during extruding with the gradient of extrusion velocities on the dies exit owing to the relative moving velocity of two or more extrusion stems. And it is possible to manufacture curved metal rods or tubes by the extru-bending machine without defects such as wrinkling and folding on the surface, distortion in the section, and thickness change in the wall.

1 . The extru-bending machine which consists of extrusion die holder (F) equipped with conical dies ( 4 ) in which one is able to insert conical plug ( 5 ) for the purpose of bending product while extruding owing to the difference of moving velocity of each billet when two or more hot metal billets are welded inside the conical die ( 4 ) cavity and are extruded to one product at the die exit after coming from the holes of the two or more-holed container ( 3 ).  
     
     
         2 . The extru-bending machine which consists of a heated container holder (E) equipped with the two or more-holed container ( 3 ) connected with conical plug ( 5 ) for the purpose of bending product at the die exit while extruding owing to the difference of moving velocity of two or more extrusion stems inserted in the holes of the two or more-holed container or owing to the difference of relative size of two or more holes.  
     
     
         3 . The extru-bending machine which consists of constant velocity stems ( 1 ) that can be moved in constant velocity and equipped at the constant velocity ram-crosshead (B) connected to constant velocity hydraulic cylinders (A); and which consists of variable velocity stems ( 2 ) that can be moved in different velocities and equipped at the variable velocity ram-crosshead (D) connected to variable velocity hydraulic cylinder (C) for the purpose of bending product at the die exit while extruding owing to the difference of relative velocity of two or more extrusion stems inserted in the holes of the two or more-holed container ( 3 ).  
     
     
         4 . The extru-bending machine which consists of hydraulic power system unit (I) equipped with flow control valves controlled by computer in order that the variable velocity ram-crosshead (D) connected to variable velocity hydraulic cylinder (C) should move differently from the constant velocity ram-crosshead (B) connected to constant velocity hydraulic cylinders (A) for the purpose of bending product at the die exit during the extrusion process.  
     
     
         5 . The extru-bending machine which consists of a relative velocity control unit (H) being able to control the bending direction and curvature while extruding by making the variable velocity stem ( 2 ) move slower or faster than the constant velocity stems ( 1 ) for the purpose of bending product at the die exit during the extrusion process.  
     
     
         6 . The extru-bending machine which is operated in the method by which the bending direction and curvature can be controlled by the difference of relative moving velocity of the variable velocity stem ( 2 ) and the constant velocity stems ( 1 ); by the difference of relative size of two or more holes in the two or more-holed container ( 3 ); by the eccentricity of center of exit and entrance sections of conical dies ( 4 ) and conical plug ( 5 ) for the purpose of bending product at the die exit during the extrusion process.  
     
     
         7 . The extru-bending machine which manufactures curved metal rods ( 100 ) or curved metal tubes ( 200 ) with an arbitrary section in various curvatures by controlling the difference of relative velocity of the variable velocity stem ( 2 ) according to the curved geometry of product inputted in the computer of the relative velocity control unit (H).