专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

61. 发明专利

JPH10277648A MANDREL FOR BENDING METALLIC PIPE 失效
公开(公告)号：JPH10277648A
公开(公告)日：1998-10-20
申请号：JP8526397
申请日：1997-04-03
申请人： NICHIRIN KK
发明人： KIMURA KENZO , GOTO SHINICHIRO
IPC分类号： B21C45/00 , B21D9/01 , C08K5/54 , C08L101/00
摘要： PROBLEM TO BE SOLVED: To improve the accuracy of bending a metallic pipe, and to improve the durability of a mandrel by constituting the mandrel for bending the metallic pipe by a resin mandrel part and a handle for drawing which is provided on its end part, and setting the outside diameter of the mandrel part to be smaller than the inside diameter of the metallic pipe. SOLUTION: A mandrel 1 comprises a mandrel part 2 and a handle 3 for drawing which is provided on its end part. The mandrel part 2 is formed of the thermoplastic resin, and preferably polyamide. The elastic modulus for bending of the resin is preferably 1000-10000 kg/cm . A releasing material of siloxane and/or modified siloxane is impregnated in the surface layer of the mandrel part 2. The outside diameter of the mandrel part 2 is 70-100% of the inside diameter of a metallic pipe. The outside diameter of the mandrel part 2 is especially preferably 84-86% of the inside diameter of the metallic pipe. The material of the handle 3 for drawing is synthetic resin or metal, and preferably polypropylene. The mandrel part 2 is preferably hollow.

62. 发明专利

JPH08300051A INTERMEDIATE CORE FOR BENDING OF HOLLOW MATERIAL 失效
公开(公告)号：JPH08300051A
公开(公告)日：1996-11-19
申请号：JP10765395
申请日：1995-05-01
申请人： TATEYAMA ALUMINUM KOGYO KK
发明人： MIZUHARA NOBUYUKI , ORIHIRA YUTAKA
IPC分类号： B21D9/01
摘要： PURPOSE: To provide an intermediate core device for bending which is easily inserted into a hollow material and has large squeezing resistance. CONSTITUTION: In a draw bender to bend a hollow material A, an inserting body 1 extending toward the hollow material A is composed of a steel tube 2 and a mandrel 3 inserted into the inside of steel tube 2 and stroked by a dedicated cylinder H. An intermediate core body 4, which is inserted into the hollow material A in following the insert body 1, is composed of a holder 5 mounted the tip part of steel tube 2, a taper shaped elastic wedge shaped body 6, which is inserted into the holder 5, mounted the tip part of mandrel 3 and thinned toward tip, and taper shaped elastic inclined plates 7, 8, which are mounted to the holder 5 and thickened toward tip. By overlapping the inclined plates 7, 8 on the inclined faces 6a, 6b of wedged shape body 6 and stroking the wedge shape body 6 through the mandrel 3, the traverse section G of intermediate core body 4 is expanded/contracted.

63. 发明专利

JPH06339731A MANDREL AND BENDING DEVICE FOR BENDING HOLLOW WORK 失效
公开(公告)号：JPH06339731A
公开(公告)日：1994-12-13
申请号：JP12874193
申请日：1993-05-31
申请人： SHOWA ALUMINUM CORP
发明人： SUZUKI YOSHIO , YOKOYAMA MASAO
IPC分类号： B21D9/01 , B21D9/05
摘要： PURPOSE:To hollow up and deform without breaking in severe bending and bend a work into a bent article having a bent part of small radius of curvature by making a bending mandrel of extrusion products of nylon. CONSTITUTION:Because a mandrel 4 is made of the extrusion products of nylon, it has excellent tensile strength and elongation. Further, after the mandrel 4 is set up in a bending device of multi bender type, even if the mandrel 4 is largely projected from a work introducing hole 1a of a fixing die 1 to a moving die 2 side, this mandrel 4 can follow up and deform to the bending without breaking, etc., in a field to receive the severe bending between the fixing die 1 and the moving die 2. Accordingly, even in the field range to receive the severe bending, the mandrel 4 can be widely arranged inside the hollow part of the work W, and the work W can be bent into the bent article of seat frame members, etc., having the bent part of small radius of curvature without unwilling deforms of shrinkage, etc.

64. 发明专利

JPH06335729A SPACER FOR BENDING PIPE AND METHOD FOR BENDING PIPE 失效
公开(公告)号：JPH06335729A
公开(公告)日：1994-12-06
申请号：JP15160193
申请日：1993-05-27
申请人： INOUE MTP KK
发明人： OHASHI MICHIYO , SANO YUTAKA
IPC分类号： B21D9/01
摘要： PURPOSE:To provide the inexpensive method capable of smoothly bending a pipe and protecting the bent part light in weight without flattening or crushing the pipe by forming an insertion part to which plural flexible bar-like materials are inserted in a bundle. CONSTITUTION:When a pipe 3 is bent while a spacer for bending the pipe is inserted into the pipe 3 such as a copper pipe as it is, it can be bent easily into a shape such as a desired vent or elbow. Since an individual bundled bar- like material 11 works separately in accordance with the bent shape of the pipe 3, the resistance caused by inserting the spacer for bending the pipe can be reduced. On the other hand, since the insertion part 1 having a diameter nearly the same as the inside diameter of the pipe made by bundling the bar-like materials 11 is inserted into the pipe, crushing of the pipe diameter is prevented surely from the inner part. Since the spacer for bending the pipe is made of synthetic resin, etc., and light in weight and excellent in workability in construction, it can be left inserted into the pipe 3 as it is under construction and the insertion part 1 serves as a protector.

你已经成功收藏专利！

检索式保存成功!

IPRDB