Apparatus and method for ram bending of tube material

Patent metadata

Field	Value
Publication number	US-10406579-B2
Application number	US-201615270585-A
Country	US
Kind code	B2
Filing date	Sep 20, 2016
Priority date	Feb 21, 2007
Publication date	Sep 10, 2019
Grant date	Sep 10, 2019

Abstract

The present invention provides a new bending apparatus and bending method of a tube material which makes it possible to achieve all of bending by a large bending radius not requiring large scale equipment or die, bending resistant to wrinkling and buckling at an inner side of the bending, and bending with a high productivity, that is, a ram bending apparatus using a punch 12 and a set of rolls 13, 13 for three-point bending of a tube material wherein the punch 12 has a groove 12a of a width of the width of a circular tube 11 or more and wherein the set of rolls 13, 13 are supported by a frame 14. The rolls 13, 13 can freely move on the frame 14 in directions away from each other in a state contacting the punch 12. The frame 14 has a hollow space 14a enabling free movement of the descending punch 12 and the circular tube 11 bent along with this during the bending of the circular tube 11.

First claim

The invention claimed is:

1. A ram bending apparatus for bending tube material, the apparatus comprising:
a single roll and a punch for bending a tube material against the punch, wherein a part of the tube material is fastened with the punch,
the punch has a groove, the punch groove having a width equal to at least a width of the tube material outer circumference,
the roll is supported by a frame, wherein the roll is between the punch and the frame,
the roll is configured to be in contact with the punch and the frame and configured to slide on the frame while contacting the punch when the tube material is in contact with the roll and the punch, wherein the roll has at its center part a groove having a width equal to at least a width of the tube material outer circumference, and
the frame has a hollow part sufficiently wide to permit the punch and the tube material to freely move within the hollow part during bending of tube material, and wherein the punch is in contact with the roll from start to finish of the ram bending, and wherein the punch is provided with a fastening jig, including a fastener, which fastens one end of the tube material on the punch, and
wherein the roll moves away from a direction of the one end fastened by the fastening jig.

2. The ram bending apparatus as set forth in claim 1 , wherein part or all of the grooves of a center part of the roll and the punch have a shape selected from the group consisting of semicircular shapes, elliptical shapes, rectangular shapes, polygonal shapes, and shapes formed of combinations of curved lines.

3. The ram bending apparatus as set forth in claim 1 , wherein part of the tube material is burled, and the punch further comprises a hollow part configured to fit over the burled part of the tube material.

4. The ram bending apparatus as set forth in claim 1 , wherein the roll is configured to rotate with respect to the frame.

5. The ram bending apparatus as set forth in claim 1 , wherein the roll is configured to rotate with respect to the punch.

6. The ram bending apparatus as set forth in claim 5 , further comprising a motor for driving and rotating the roll in a direction making the tube material advance toward a direction opposite to the fastening jig.

7. The ram bending apparatus as set forth in claim 5 , further comprising a motor for driving and rotating the roll in a direction making a tube material advance toward the fastening jig.

8. The ram bending apparatus as set forth in claim 1 , wherein the roll is configured to freely move in an axial direction of the roll.

9. The ram bending apparatus as set forth in claim 1 , wherein a surface of the frame on which the roll moves forms an acute angle with a direction of progression of the punch.

10. A ram bending method of a tube material, comprising:
inserting a tube material into a groove provided in an outer circumference of a punch,
fastening a part of the tube material with the punch,
clamping the tube material by a single roll and part of the punch, wherein the roll is positioned at an opposite side of the tube material from the punch and supported by a frame, wherein the roll is between the punch and the frame, and
moving the punch to the frame side, and sliding the roll on the frame while contacting the punch when the tube material is in contact with the roll and the punch, bending the tube material to the shape of the punch, and wherein the punch is in contact with the roll from start to finish of the ram bending, and wherein the punch is provided with a fastening jig, including a fastener, which fastens one end of the tube material on the punch, and
wherein the roll moves away from a direction of the one end fastened by the fastening jig.

11. The ram bending method of a tube material as set forth in claim 10 , wherein part or all of grooves of a center part of the roll and the punch have a shape selected from the group consisting of semicircular shapes, elliptical shapes, rectangular shapes, polygonal shapes, and shapes of combinations of curved lines, thereby simultaneously deforming a cross-sectional shape of the tube material deform and bending the material.

12. The ram bending method of a tube material as set forth in claim 10 , wherein the tube material is partially burled for bending.

13. The ram bending method of a tube material as set forth in claim 10 , further comprising bending the material while the roll rotates with respect to the frame.

14. The ram bending method of a tube material as set forth in claim 10 , further comprising bending the material while the roll rotates with respect to the punch.

15. The ram bending method of a tube material as set forth in claim 14 , further comprising bending the material while driving the rotation of the roll in a direction which makes the tube material advance toward a direction opposite to the fastening jig.

16. The ram bending method of a tube material as set forth in claim 14 , further comprising bending the material while driving the rotation of the roll in a direction which makes the tube material advance toward the fastening jig.

17. The ram bending method of a tube material as set forth in claim 10 , further comprising bending the material while the roll moves in an axial direction of the roll.

18. The ram bending method of a tube material as set forth in claim 10 , further comprising bending the material while the roll moves at an acute angle with respect to a direction of progression of the punch.

Assignees

• Nippon Steel & Sumitomo Metal Corp
• Nippon Steel Corp

Inventors

• Mizumura Masaaki
• Kuriyama Yukihisa

Classifications

• B21D7/066

  combined with oscillating members · CPC title

• B21D7/06 Primary

  in press brakes or between rams and anvils or abutments; Pliers with forming dies · CPC title

• B21D9/04

  the mandrel being rigid · CPC title

• B21D7/00

  Bending rods, profiles, or tubes (B21D11/02 - B21D11/18 take precedence; using mandrels or the like B21D9/00) · CPC title