Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C23/00—Extruding metal; Impact extrusion
  • B21C23/01—Extruding metal; Impact extrusion starting from material of particular form or shape, e.g. mechanically pre-treated
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C23/00—Extruding metal; Impact extrusion
  • B21C23/02—Making uncoated products
  • B21C23/04—Making uncoated products by direct extrusion
  • B21C23/08—Making wire, bars, tubes
  • B21C23/12—Extruding bent tubes or rods
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C25/00—Profiling tools for metal extruding
  • B21C25/08—Dies or mandrels with section variable during extruding, e.g. for making tapered work; Controlling variation
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
  • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
  • B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels

Definitions

• This invention relates to the extru-bending machine that can bend the product by extruding two or more hot metal billets with the machine which consists of a extrusion die holder equipped with conical dies, a container holder heating the two or more-holed container with conical plug, two or more extrusion stems, an hydraulic power system unit, a relative velocity control unit, and support frame structure.
• the extru-bending machine can bend products simultaneously- while extruding with the gradient of the extrusion velocity at the die exit, owing to the difference of relative moving velocity of two or more extrusion stems, when two or more hot metal billets are welded together inside the conical extrusion die cavity and extruded to one product at the die exit.
• the extru-bending machine consists of an extrusion die holder equipped with conical dies, a heated container holder, a two or more- holed container with conical plug, two or more extrusion stems moving at different velocities, an hydraulic power system unit pushing the extrusion stems, a relative velocity control unit, and the support frame structure.
• the bending curvature can be controlled by the difference of relative velocity of two or more extrusion stems. For example, when the velocity of one extrusion stem is constant, if the other symmetric extrusion stem should move fast or slowly, it can change the curvature or the direction of bending.
• the curvature of bending could be controlled in order not to bend while extruding by equalizing the velocity of variable velocity stem and the velocity of constant velocity stems, it is possible to get such an effect that can bend straight extruded metal tubes or rods by a conventional rotational bending machine. And it is possible to get such results that the extru-bending machine can bend extruded products without such defects as distortion of section, thinning of thickness, and wrinkling and folding on surface that can happen easily when they should be bended by conventional rotational bending machines.
• the extru-bending machine can also control the bending curvature by adjusting the difference of relative size of the holes in the two or more-holed container. For example, although there is no difference in the relative velocity of extrusion stems, the machine can extrude and bend curved product with constant bending curvature by differing the size of holes in relation to each other.
• the extru-bending machine is characterized by the arrangement of hydraulic cylinders in order to control the relative velocity of extrusion stems, in these way: by the number of extrusion stems, by the structure of the ram-crossheads, and by the structure of the two or more-holed container that are different from those of conventional extrusion machines.
• Figure 1 is a perspective overall view of the hot metal extru- bending machine of the present invention
• Figure 2 is a cross-sectional view of the flow of hot metal in extru-bending process for the curved metal rod;
• Figure 3 is a cross-sectional view of the flow of hot metal in extru-bending process for the curved metal tube
• Figure 4 is a perspective view of a constant velocity ram- crosshead and constant velocity stems
• Figure 5 is a perspective view of a variable velocity ram- crosshead and a variable velocity stem
• Figure 6 is a perspective view of a heated container holder equipped with a two or more-holed container and a die holder;
• Figure 7 is a view of examples of products of curved metal rods or tubes that can be manufactured by the present invention.
• constant velocity stem 2 variable velocity stem 3: two or more-holed container 4: conical dies 5:conical plug 6: right side billet 7: left side billet
• A constant velocity hydraulic cylinder
• B constant- velocity ram-crosshead
• C variable velocity hydraulic cylinder
• the extru-bending machine consists of constant velocity hydraulic cylinders(A), a constant velocity ram-crosshead(B), a variable velocity hydraulic cylinder(C), a variable velocity ram- crosshead(D), a heated container holder(E), an extrusion die holder(F), the support frame structure(G), a relative velocity control unit(H), an hydraulic power system unit(I) in Figure 1 and constant velocity stems(l), a variable velocity stem(2), a two or more-holed container(3), conical dies(4) in Figure 2 and conical plug(5) in Figure 3.
• variable velocity stem(2) which is connected to variable velocity ram- crosshead(D) can be moved slowly or fast in variable velocity independently from the constant velocity stems(l) and it can be slid through the sliding hole of the constant velocity ram-crosshead(B),
• Figure 2 is an example of the extru-bending process of curved metal rod. If the variable velocity stem(2) is moved more slowly than the constant velocity stem(l), because the left side billet(7) velocity by the variable velocity stem(2) is moved more slowly than the velocity of the right side billet(6), the extru-bending machine can extrude and bend in the direction of left side during the process of combining and welding the four billets inside conical die(4) cavity. And then, because there is no difference in the velocity of the' upper and lower extrusion stem, the bending happens only in the direction of the left side without bending in the direction of the upper or lower side. Bending curvature and bending direction can also be controlled by the difference of the relative velocity of the variable velocity stem(2) and the constant velocity stem(l).
• Figure 3 is an example of the extru-bending process of curved metal tube. If the variable velocity stem(2) is moved more slowly than the constant velocity stem(l), because the velocity of the left side billet(7) is moved more slowly than the velocity of the right side billet(6), the extru-bending machine can extrude and bend in the direction of the left side during the process of combining and welding the four billets inside conical dies. And, because there is no difference in the velocity of the upper and lower extrusion stems, the bending happens only in the direction of left side without bending in the direction of the upper or lower side.
• variable velocity stem(2) is moved faster than the constant velocity stem(l)
• the extru-bending machine can extrude and bend in the direction of the right side.
• the variable velocity stem(2) is moved at the same velocity as the constant velocity stem(l)
• the extru-bending machine can extrude only straight extruded metal rods or tubes without bending as in conventional extrusion processes.
• the extru-bending machine can extrude curved products as in Figure 7 and can get such effects as being able to bend by conventional rotational bending machines. And in Figure 7, the extru-bending machine can bend extruded products with complicated sections which are difficult to bend, and products having various curvatures.
• the velocity control of the variable velocity stem(2) in order to control bending directions and curvatures can be done by using the relative velocity control unit(H) connected to the variable velocity hydraulic cylinder(C) driven by the hydraulic power system unit(I) with flow control valves controlled by computer.
• the present extru-bending machine can be used for bending the curved rods or tubes while extruding in order to eliminate such defects as thinning or thickening in the walls of the product, distortion of the section, and wrinkling or folding on the surface after bending process.
• This present invention can be classified as a complex metal forming machine with a new structure and function which is different from the concept of conventional extrusion machines, and it can contribute to increase productivity by combining the extrusion process and the bending process. And, because the machine can bend products with complicated non-symmetric sections which are difficult to bend, there can be many applicable fields for industry.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Extrusion Of Metal (AREA)
• Bending Of Plates, Rods, And Pipes (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=19696657

Family Applications (1)

Country Status (6)

Cited By (3)

Families Citing this family (11)

Citations (3)

Family Cites Families (13)

• 2000
  • 2000-11-01 KR KR10-2000-0064631A patent/KR100416578B1/ko not_active IP Right Cessation
• 2001
  • 2001-10-22 AU AU2002212782A patent/AU2002212782A1/en not_active Abandoned
  • 2001-10-22 DE DE10196891T patent/DE10196891T1/de not_active Ceased
  • 2001-10-22 JP JP2002539079A patent/JP2004512955A/ja active Pending
  • 2001-10-22 US US10/415,606 patent/US20040074275A1/en not_active Abandoned
  • 2001-10-22 WO PCT/KR2001/001786 patent/WO2002036279A1/en active Application Filing

Patent Citations (3)

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