US3704616A - Cold-working plastic bending machine - Google Patents

Cold-working plastic bending machine Download PDF

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Publication number
US3704616A
US3704616A US161022A US3704616DA US3704616A US 3704616 A US3704616 A US 3704616A US 161022 A US161022 A US 161022A US 3704616D A US3704616D A US 3704616DA US 3704616 A US3704616 A US 3704616A
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United States
Prior art keywords
main roller
press
workpiece
roller
plate
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Expired - Lifetime
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US161022A
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English (en)
Inventor
Yasunori Taira
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TOKYO GIKEN KOGYO KK
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TOKYO GIKEN KOGYO KK
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    • 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
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/08—Bending rods, profiles, or tubes by passing between rollers or through a curved die

Definitions

  • ABSTRACT The present invention relates to a cold-working plastic F
  • a bending machine having a tiltably adjustable press- [30] P Pmmy Dam plate located-slightly ahead of the main roller of the July 16, 1970 Japan ..45/061749 hine, A plurality of side rollers is provided, one on 1 each side of themain roller.
  • Structural roll-shaped steel is made lightweight and thin with a profile exhibiting a high flexual rigidity to suit its intended use.
  • a profile exhibiting a high flexual rigidity to suit its intended use.
  • transverse b'uckling occurs at a certain magnitude of this moment.
  • FIG. 1 is a plan view showing the arrangement of rollers of a cold plastic bending machine according to the present invention
  • FIG. 2 is a longitudinal cross sectional view taken along lines 2-2 of FIG. 1 showing the relationship between the main roller and the end-bending roller;
  • FIG. 3 is a side view corresponding to FIG. 2 but slightly modified to bend flat steel
  • FIG. 4 is a pictorial view of angle steel bent to a small radius of curvature
  • FIG. 5 shows an operating circuit diagram of oil pressure in various cylinders for a machine according to the present invention.
  • the machine of the present invention shown in FIG. 1 comprises a first side roller 24, an end-bending roller 17, and a second side roller 37 each rotatably arranged close to a main roller 15.
  • the axial distance A between the axis of the main roller and the axis of the side roller 24, and the axial distance B between the axis of the main roller 15 and the axis of the side roller 37 are determined respectively by the profile dimensions of the shaped steel workpiece 23 and the bending radius of curvature.
  • the axial distance A is variable by manual adjustment of the screw 7', as shown best in FIG. 2.
  • the position of the roller 37 is changeable by means of the cylinder 31 and the ram 30.
  • the position of the end bending roller 17 is changeable by means of the cylinder 20 and the ram 19.
  • the forces of the rollers 17, 24, and 37 acting on the shaped steel workpiece 23 are respectively P P and P thereby the bending is balanced.
  • FIG. 2 shows the relationship between the main roller 15 and the end-bending roller 17.
  • a hollow shaft 4 is pivoted to the machine body 5 through a combination of radial and thrust bearings.
  • the main roller15 is keyed to one end of the hollow shaft 4, and a drive gear 6 is keyed to the other end of the shaft.
  • a shaft 2 passes through the hollow of shaft 4 and is pivoted on a spherical bearing 3 fitted at the top of the hollow shaft 4, as shown in FIG. 2.
  • the shaft 2 can be tilted at an angle 0 to the axis of the hollow shaft 4.
  • One end of the shaft 2 carries a nut 12 for securing a press-plate 1 to the shaft.
  • the top surface of the press-plate is tapered toward the periphery and the bottom surface forms a flat disk.
  • the other end of the shaft 2 is fixed to the ram 8 by a nut 13 through a thrust bearing.
  • a hydraulic cylinder 7 is fitted to the machine body 5 through a gear cover 14.
  • the shaped steel workpiece 23 rotates in a pressed condition under the force F, of the main roller 15 and the press-plate 1.
  • the shaped steel workpiece 23 is moved in the direction of arrow M, as shown in FIG. 1, while being bent to a required radius of curvature.
  • the rollers 17, 24, and 37 are balanced with the shaped steel workpiece 23 at the pressures P P and P
  • the end-bending roller 17, located nearest the main roller 15, mainly serves to bend both ends of the shaped steel workpiece 23.
  • the end-bending roller 17 applies the pressure P to the workpiece to bend it.
  • the change valve 41 of FIG. 5 is operated to switch the oil from the joint holes 10, 21, 33 of the cylinders 7, 20, 31 to the joint holes 11, 22, 32.
  • the ram 8 then pushes back the pressplate 1 in the direction reverse to the action of the pressure P while the end-bending roller 17 and the side roller 37 acting through the yokes 18, 38 are respectively turned back in the direction reverse to the actions of the pressures P P
  • the shaped steel workpiece 23 is thereby released from the rollers, and as shown in FIG. 4, a buckle-free product with minimal out-of-roundness is obtained.
  • Reference character E represents the junction between the start and end of bending.
  • FIG. 3 is a side view illustrating the relationship between the main roller 15 and the end-bending roller 17 during the plastic bending of a flat steel workpiece 25 having a simple rectangular cross section.
  • the height H scarcely changes, but the thickness increases to b on the compression side and decreases to b, on the tension side.
  • twisting and creasing can easily occur thereby causing buckling.
  • a tilting angle is formed between the axis of the main roller and the shaft 2 on which the cylinder 7 is mounted.
  • the compression side thickness b between the main roller 15 and the press-plate 1 applying the pressure P is plastically being deformed all the time under the pressure P, thereby preventing buckling.
  • the steel workpiece 25 can be reliably fed without slippage by the main roller 15 of FIG. 1 which rotates in the direction of arrow N.
  • the pressure P, exerted by the press-plate 1 on the main roller 15, and the respective pressures P P P of the rollers 17, 24, 37, are in a linear proportional relationship.
  • the proportionality of the pressures P P P P to the size and radius of curvature of the shaped steel workpiece 23 or the flat steel workpiece 25 assures an ideal bending work.
  • FIG. 5 is an oil pressure operational circuit diagram for each cylinder.
  • the change valve 41 controls with respectively adequate pressures the supply and exhaust of pressurized oil from the power unit 40 holding the motor M, the pump P, a relief valve and a pressure gauge, to and from the cylinder 7 and the ram 8 for the main roller press-plate, to and from the cylinder and the ram 19 for the endbending roller, and to and from the cylinder 31 and the ram 30 for the side roller.
  • pressurized oil is supplied through the change valve 41 to the joint holes 10, 21, 33 of the cylinders, the shaped steel workpiece is pressed and bent.
  • the rams 8, 19, 30 are pushed away to release the workpiece.
  • the machine according to the present invention renders it unnecessary to bend both ends of a shaped steel workpiece by a press as in conventional bending work, and
  • the point of maximum bending moment (maximum plastic deformation) is at the same time the point most apt to buckle.
  • a necessary and sufficient force I is exerted by the press-plate 1 to prevent buckling.
  • the main roller 15 equipped with an anti-slip mechanism working the pressure P, and using the press-plate l the shaped steel workpiece 23 or the flat steel workpiece 25 is pressed. Both themain roller 15 and the press-plate 1 are rotated in the direction of arrow N direction to take in and take out the steel reliably without slipping.
  • a buckle-free product with a required radius of curvature is efficiently obtained.
  • the machine according to this invention can ideally bend rectangular steel, angle steel, I-l-steel, steel tube or any other shaped steel in a similar manner.
  • a cold-working plastic bending machine comprising a main roller having a vertical axis of rotation, a plurality of side rollers also having vertical axes of rotation with at least one side roller on each side of the main roller and another side roller directly adjacent the main roller, the rollers defining a path for a workpiece to be bent whereby the workpiece passes between the main roller and each of the side rollers with the main roller engaging the bend-compression side of the workpiece during the bending operation, and a tiltably adjustable press-plate directly above the main roller including means to urge the press-plate toward the main roller during the bending operation of a workpiece therebetween.
  • a cold-working plastic bending machine as in claim 1 including cylinder and ram arrangements connected to the side rollers for changing the positions of these rollers relative to the position of the main roller.
  • a cold-working plastic bending machine as in claim 1 wherein portions of the main roller and the press-plate are roughened to prevent slippage between the main roller and the press-plate and workpiece.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
US161022A 1970-07-16 1971-07-09 Cold-working plastic bending machine Expired - Lifetime US3704616A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45061749A JPS4946467B1 (de) 1970-07-16 1970-07-16

Publications (1)

Publication Number Publication Date
US3704616A true US3704616A (en) 1972-12-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
US161022A Expired - Lifetime US3704616A (en) 1970-07-16 1971-07-09 Cold-working plastic bending machine

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US (1) US3704616A (de)
JP (1) JPS4946467B1 (de)
DE (1) DE2129972C3 (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048830A (en) * 1976-01-29 1977-09-20 Chr. Hausler Ag Four-roller sheet bending machines
US4151733A (en) * 1976-05-14 1979-05-01 Daido Metal Company Ltd. Method of producing thrust washers
EP0013653A1 (de) * 1979-01-12 1980-07-23 ETUDES GENERALES D'INGENIERIE MECANIQUE ET OUTILLAGES (EGIMOT) Société dite Vorrichtung zur Herstellung gebogener Winkeleisen
FR2530981A1 (fr) * 1982-07-27 1984-02-03 Mercier J Perfectionnements aux machines a rouler les profiles
US4583675A (en) * 1981-12-23 1986-04-22 Hitachi, Ltd. Method of production of a part formed with an opening
US5044187A (en) * 1988-10-11 1991-09-03 King William E Metal tubing roller or crowner
US5388441A (en) * 1992-12-29 1995-02-14 United States Surgical Corporation Needle curver with automatic feed
US5425258A (en) * 1992-10-09 1995-06-20 United States Surgical Corporation Needle curving apparatus
US5431036A (en) * 1992-09-02 1995-07-11 United States Surgical Corporation Needle curving apparatus
US6643930B2 (en) * 2001-08-02 2003-11-11 Robert Issagholian-Havai Method and apparatus for producing end flange member for cylindrical duct
US20040237619A1 (en) * 2001-07-18 2004-12-02 Alessandro Caporusso Control element adapted to prevent an external-flange angle iron from being twisted during its bending
US20080271509A1 (en) * 2007-05-01 2008-11-06 R&Y Enterprises, Llc Computer controlled flexible rolling machine
US20130098130A1 (en) * 2011-10-24 2013-04-25 Cml International S.P.A. Bending machine for helically bending an elongated workpiece
CN103240310A (zh) * 2013-05-22 2013-08-14 南通奥特机械设备有限公司 一种数控四辊型材弯曲机
CN103521570A (zh) * 2013-11-04 2014-01-22 广西大学 棒料成型为可对焊圆环的五辊卷圆装置
CN106166572A (zh) * 2016-08-31 2016-11-30 国汇机械制造泰州有限公司 一种弯管机
US20170108036A1 (en) * 2014-03-28 2017-04-20 Aktiebolaget Skf Spherical roller bearing
CN112547969A (zh) * 2020-11-23 2021-03-26 广西凤锦珠宝有限公司 一种成型机及空心弹力手镯

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52132577U (de) * 1976-04-02 1977-10-07
CN105689478A (zh) * 2016-04-22 2016-06-22 兰州兰石重型装备股份有限公司 角钢圈卷圆成型工装及其使用方法
CN106180412A (zh) * 2016-08-30 2016-12-07 优德精密工业（昆山）股份有限公司 一种圆柱卡簧快速折弯治具
CN106563716A (zh) * 2016-10-19 2017-04-19 中安安轩安全产业发展有限公司 一种实现型材正反弯曲的机构

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1666909A (en) * 1928-04-24 Bending machine
US1804468A (en) * 1927-08-25 1931-05-12 Whitney Metal Tool Company Angle bar bending machine
US1926830A (en) * 1932-03-25 1933-09-12 Buffalo Forge Co Bending machine roll
US2093933A (en) * 1935-05-13 1937-09-21 Kelsey Hayes Wheel Co Rolling machine
US2160216A (en) * 1936-11-23 1939-05-30 Kane & Roach Inc Machine for bending angle bars

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1666909A (en) * 1928-04-24 Bending machine
US1804468A (en) * 1927-08-25 1931-05-12 Whitney Metal Tool Company Angle bar bending machine
US1926830A (en) * 1932-03-25 1933-09-12 Buffalo Forge Co Bending machine roll
US2093933A (en) * 1935-05-13 1937-09-21 Kelsey Hayes Wheel Co Rolling machine
US2160216A (en) * 1936-11-23 1939-05-30 Kane & Roach Inc Machine for bending angle bars

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4048830A (en) * 1976-01-29 1977-09-20 Chr. Hausler Ag Four-roller sheet bending machines
US4151733A (en) * 1976-05-14 1979-05-01 Daido Metal Company Ltd. Method of producing thrust washers
EP0013653A1 (de) * 1979-01-12 1980-07-23 ETUDES GENERALES D'INGENIERIE MECANIQUE ET OUTILLAGES (EGIMOT) Société dite Vorrichtung zur Herstellung gebogener Winkeleisen
FR2446140A1 (fr) * 1979-01-12 1980-08-08 Egimot Procede et dispositif de fabrication de cornieres cintrees
US4583675A (en) * 1981-12-23 1986-04-22 Hitachi, Ltd. Method of production of a part formed with an opening
FR2530981A1 (fr) * 1982-07-27 1984-02-03 Mercier J Perfectionnements aux machines a rouler les profiles
US5044187A (en) * 1988-10-11 1991-09-03 King William E Metal tubing roller or crowner
US5431036A (en) * 1992-09-02 1995-07-11 United States Surgical Corporation Needle curving apparatus
US5425258A (en) * 1992-10-09 1995-06-20 United States Surgical Corporation Needle curving apparatus
US5388441A (en) * 1992-12-29 1995-02-14 United States Surgical Corporation Needle curver with automatic feed
US5450739A (en) * 1992-12-29 1995-09-19 United States Surgical Corporation Needle curver with automatic feed
US20040237619A1 (en) * 2001-07-18 2004-12-02 Alessandro Caporusso Control element adapted to prevent an external-flange angle iron from being twisted during its bending
US7065998B2 (en) * 2001-07-18 2006-06-27 Cml International S.P.A. Control element adapted to prevent an external-flange angle iron from being twisted during its bending
US6643930B2 (en) * 2001-08-02 2003-11-11 Robert Issagholian-Havai Method and apparatus for producing end flange member for cylindrical duct
US20080271509A1 (en) * 2007-05-01 2008-11-06 R&Y Enterprises, Llc Computer controlled flexible rolling machine
US9168577B2 (en) * 2011-10-24 2015-10-27 Cml International S.P.A. Bending machine for helically bending an elongated workpiece
US20130098130A1 (en) * 2011-10-24 2013-04-25 Cml International S.P.A. Bending machine for helically bending an elongated workpiece
CN103240310A (zh) * 2013-05-22 2013-08-14 南通奥特机械设备有限公司 一种数控四辊型材弯曲机
CN103521570A (zh) * 2013-11-04 2014-01-22 广西大学 棒料成型为可对焊圆环的五辊卷圆装置
CN103521570B (zh) * 2013-11-04 2016-04-27 广西大学 棒料成型为可对焊圆环的五辊卷圆装置
US20170108036A1 (en) * 2014-03-28 2017-04-20 Aktiebolaget Skf Spherical roller bearing
US10844903B2 (en) * 2014-03-28 2020-11-24 Aktiebolaget Skf Spherical roller bearing
CN106166572A (zh) * 2016-08-31 2016-11-30 国汇机械制造泰州有限公司 一种弯管机
CN106166572B (zh) * 2016-08-31 2018-05-08 国汇机械制造泰州有限公司 一种弯管机
CN112547969A (zh) * 2020-11-23 2021-03-26 广西凤锦珠宝有限公司 一种成型机及空心弹力手镯

Also Published As

Publication number Publication date
DE2129972C3 (de) 1974-02-21
DE2129972B2 (de) 1973-08-02
JPS4946467B1 (de) 1974-12-10
DE2129972A1 (de) 1972-01-20

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