WO2009120153A9 - Procédé pour réaliser un filetage sur une barre de renfort déformée - Google Patents

Procédé pour réaliser un filetage sur une barre de renfort déformée Download PDF

Info

Publication number
WO2009120153A9
WO2009120153A9 PCT/SG2008/000424 SG2008000424W WO2009120153A9 WO 2009120153 A9 WO2009120153 A9 WO 2009120153A9 SG 2008000424 W SG2008000424 W SG 2008000424W WO 2009120153 A9 WO2009120153 A9 WO 2009120153A9
Authority
WO
WIPO (PCT)
Prior art keywords
thread
bar
deformed bar
die
deformed
Prior art date
Application number
PCT/SG2008/000424
Other languages
English (en)
Other versions
WO2009120153A1 (fr
Inventor
Bong Sai Chua
Original Assignee
Bong Sai Chua
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Bong Sai Chua filed Critical Bong Sai Chua
Priority to CN2008801091602A priority Critical patent/CN101965236A/zh
Publication of WO2009120153A1 publication Critical patent/WO2009120153A1/fr
Publication of WO2009120153A9 publication Critical patent/WO2009120153A9/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/12—Forming profiles on internal or external surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H1/00—Making articles shaped as bodies of revolution
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/56—Making machine elements screw-threaded elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups

Definitions

  • the present invention relates to a method for working a thread onto a deformed bar of the type used for reinforcing concrete.
  • a reinforcing bar is typically a steel bar manufactured with surface deformations to provide a locking anchorage with the surrounding concrete, and is also known as a "deformed bar”.
  • the deformed bars are supplied in pre-cut lengths and accordingly it may be necessary to connect several bars end to end for use depending upon the size of the construction work.
  • One known method of connecting the bars is by using a latching process wherein end portions of the two bars are overlapped and bound by steel wires.
  • this connection method results in significant loss of material since the end portions are required to overlap. Additionally, this method requires considerable labour to connect the bars, and furthermore, the connections become weak with age which correspondingly weakens the overall structure.
  • connection end portions Another method of connecting the bars has been proposed which includes heating the connection end portions and upsetting the connection end portions by exertion of force in the axial direction.
  • loss of material is caused by shrinking the length of the deformed bar.
  • the elongation rate may decrease by a change in the material structure between the heated portion and the non-heated portion. This will result in the connection end portion becoming weak on impact, and an irregular structure distribution may result.
  • a cold process for connecting the bar ends has been developed involving using a thread portion at the connection end portion of each connecting bar, and a connecting piece or coupler is threaded between the two bars around the corresponding threaded portions.
  • a cut thread portion is formed at the connection ends.
  • a rolled thread portion is formed at the connection ends after finishing the cutting operation.
  • the tensile strength and the hardness of the deformed bar becomes very high by work hardening and a value of impact absorption energy is rapidly decreased. This results in the structure of the upset portion becoming non-uniformly formed.
  • CA 2,268,878 Another method of working a thread of a connection end portion has been disclosed in CA 2,268,878.
  • This method includes swaging the deformed bar at normal temperature such that a maximum diameter of the connection end portion is equal to or slightly larger than a diameter of a cylindrical body of the deformed bar or slightly smaller than a diameter of the deformed bar depending on a degree of working, and rolling a thread portion onto the outer peripheral face of the connection end portion.
  • the present invention uses a pressing step to press thread marks onto a deformed bar before a rolling step to form the final thread on the bar.
  • the present invention provides a method for working a thread onto a deformed bar of the type used for reinforcing concrete, the method comprising the steps of: pressing the deformed bar to a predetermined diameter using a die having thread formations thereon to correspondingly form thread marks on the deformed bar; and rolling the pressed deformed bar to form the final thread.
  • the step of pressing the deformed bar to a predetermined diameter using a die having thread formations thereon comprises cold-pressing the deformed bar.
  • the step of rolling the pressed deformed bar to form the final thread comprises cold-rolling the pressed deformed bar.
  • a deformed bar for reinforcing concrete having at least one thread thereon, wherein the thread is worked by the method above is also provided.
  • the present invention and/or forms thereof increases the quality and consistency of the final thread on the deformed bar, as the thread marks are formed on the bar preferably at the same angle and pitch of the roller thread, which causes less resistance during the rolling step. This also enhances the life expectancy of the rollers, which reduces construction cost and accordingly achieves the object.
  • Figure 1a through Figure 10 are stage views showing a method for working a thread onto a deformed bar for reinforcing concrete in accordance with one embodiment of the present invention, in particular:
  • Figure 1 a shows a front elevational view of a pressing die for use with the embodiment of the present invention
  • Figure 1b shows a side elevational view of the pressing die of Figure 1a
  • Figure 1 c shows a perspective view of the pressing die of Figure 1 a
  • Figure 2a shows a front elevational view of the pressing die of Figure 1a with a deformed bar located between the parts of the die;
  • Figure 2b shows a side elevational view of Figure 2a
  • Figure 3a shows a front elevational view of the pressing die and bar of Figure 2a with arrows indicating the pressing step
  • Figure 3b shows a side elevational view of Figure 3a
  • Figure 4a shows a front elevational view of the pressing die and bar of Figure 3a with the die in the pressed position
  • Figure 4b shows a side elevational view of Figure 4a
  • Figure 5a shows a front elevational view of the pressing die and bar of Figure 3a after the pressing step with the die in the open position
  • Figure 5b shows a side elevational view of Figure 5a, showing the thread marks formed on the bar
  • Figure 6a shows a front elevational view of the pressing die and bar of Figure 5a, showing the bar being rotated;
  • Figure 6b shows a side elevational view of Figure 6a
  • Figure 7a shows a front elevational view of the pressing die and rotated bar of Figure 6a with the die again in the pressed position;
  • Figure 7b shows a side elevational view of Figure 7a
  • Figure 8a shows a front elevational view of the pressing die and bar of Figure 7a after the pressing step with the die in the open position;
  • Figure 8b shows a side elevational view of Figure 8a, showing the further thread marks formed on the bar;
  • Figure 9 shows a cold-rolling step for forming the final thread, with the pressed bar located between two rollers;
  • FIG. 10 shows the deformed bar with final thread formed thereon.
  • the die 10 is formed of two parts 10a and 10b, although other shapes and configurations of dies may be used, for example the die may only include one part.
  • the die 10 is formed of DF-2 material, which exhibits a hardness of between 52 to 58 on the Rockwell scale.
  • the die 10 comprises a substantially semi-circular channel 12 in each part 10a and 10b thereof.
  • a first portion of the channel 12 comprises thread formations 14 including a plurality of ribs and nodes for pressing into the deformed bar.
  • the second portion of the channel 12 comprises a depth greater than the first portion, with a third portion of varying depth connecting the first and second portions.
  • the length of the thread formations portion of the channel 12 may vary depending upon the length of thread required on the deformed bar and the length of the die 10.
  • the thread formations 14 may extend along the entire length of the channel 12.
  • a deformed bar 16 for reinforcing concrete is inserted into the die 10, as indicated by the arrow 17, with the location where the thread to be formed is positioned at the portion of the die 10 having the thread formations 14.
  • the deformed bar 16 comprises a cylindrical body with ribs 20 and nodes 22 formed on an outer peripheral face.
  • the deformed bar 16 is in the range of 380 yield strength to 600 yield strength.
  • the preferred diameter of the deformed bar 16 is 10 mm to 50 mm, although other sizes could be used as desired.
  • the two die portions 10a and 10b are pressed together, as indicated by the arrows 23 in Figures 3a and 3b, and Figures 4a and 4b.
  • the pressing together causes the diameter of the deformed bar 16 within the first portion of the die 10 to be reduced to the predetermined diameter while also causing thread marks to form on the bar 16 corresponding to the thread formations 14 on the die 10.
  • the pressing step may also straighten the bar 16 should the connection end portion be slightly bent relative to an intermediary portion of the deformed bar.
  • the pressing is performed while the deformed bar 16 is at a normal room or cold temperature.
  • the pressure is applied using a hydraulic machine, typically applying pressure in the range of 800 PSI to 3,000 PSI depending upon the deformed bar size and the yield strength.
  • the time for which the pressure is applied is dependent upon the materials and the diameter of the bar 16.
  • the die portions 10a and 10b are separated, as indicated by the arrows 25 in Figures 5a and 5b, and the deformed bar 16 is released.
  • the deformed bar 16 will have thread marks 24 worked on part of the circumference of the bar.
  • the pitch and depth of the thread marks 24 formed will be dependent on the diameter of the deformed bar 16.
  • Various kinds and shapes of thread marks may be worked, such as a circular thread or a triangular thread, however preferably the thread is a circular thread.
  • the bar 16 is then rotated by approximately 90 degrees to position the part of the bar without the thread marks within the die.
  • the die 10 is then pressed together as shown in Figures 7a and 7b, to forms thread marks around the remaining (unthreaded) portion of the bar.
  • the die is released as shown in Figures 8a and 8b, the entire circumference of the bar has thread marks formed thereon. In other forms and configurations of the die, it may not be necessary to rotate the deformed bar as one press may enable the thread marks to be formed around the entire circumference.
  • the bar 16 with the thread marks 24 then undergoes a rolling step as indicated in Figure 9.
  • the bar 16 is placed between two rollers 26 which cold-roll into the thread marks 24 on the bar 16, forming the deeper, final, thread.
  • the thread pitch of the rollers 26 will vary depending upon the size of the deformed bar 16. Typically, a deformed bar with a diameter of 10 mm will result in having a pitch of about 1.5 mm and a depth of about 0.8 mm, whereas a deformed bar with a diameter of 50 mm will typically have a pitch of about 4.0 mm and a depth of about 2.0 mm.
  • the rolling step is performed while the bar 16 is at a normal room or cold temperature to ensure there is no alteration of the inherent properties of the bar 16 to cause weakness.
  • the rolling step comprises using a conventional rolling machine that is known to a person skilled in the art.
  • the working pressure during the rolling of the final thread ranges from 800 PSI to 2,000 PSI.
  • the revolutions of the roller machine are standard with the particular machine, and do not impact on the quality of the final thread on the deformed bar.
  • the final thread is formed within 2 to 25 seconds depending upon the size of the bar 16 and the length of the thread.
  • each threaded end of the bar 16 may be connected to another bar 16 by use of a coupler.
  • the coupler comprises corresponding thread formations on an inner surface thereof, which accordingly mate with the thread formed on the outer surface of the ends of the bar 16.
  • the present embodiment increases the quality and consistency of the final thread on the deformed bar, as the thread marks, are formed on the bar preferably at the same angle and pitch of the roller thread, which causes less resistance during the rolling step. This also enhances the life expectancy of the rollers, which reduces construction cost. It will be appreciated that persons skilled in the art could implement the present invention in different ways to the one described above, and variations may be produced without departing from its spirit and scope.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Forging (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

La présente invention porte sur un procédé pour réaliser un filetage sur une barre déformée pour renforcer du béton. Le procédé comprend les étapes de compression de la barre déformée jusqu'à un diamètre prédéterminé à l'aide d'une matrice ayant des formations de filetage sur celle-ci pour former de façon correspondante des marques de filetage sur la barre déformée ; et le laminage de la barre déformée comprimée pour former le filetage final. Le procédé augmente la qualité et l'uniformité du filetage final.
PCT/SG2008/000424 2008-03-24 2008-11-06 Procédé pour réaliser un filetage sur une barre de renfort déformée WO2009120153A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2008801091602A CN101965236A (zh) 2008-03-24 2008-11-06 在变形钢筋上形成螺纹的方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SG200802314-5 2008-03-24
SG200802314-5A SG155801A1 (en) 2008-03-24 2008-03-24 Method for working a thread on deformed reinforcing bar

Publications (2)

Publication Number Publication Date
WO2009120153A1 WO2009120153A1 (fr) 2009-10-01
WO2009120153A9 true WO2009120153A9 (fr) 2010-10-14

Family

ID=41114196

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SG2008/000424 WO2009120153A1 (fr) 2008-03-24 2008-11-06 Procédé pour réaliser un filetage sur une barre de renfort déformée

Country Status (4)

Country Link
KR (1) KR20100027242A (fr)
CN (1) CN101965236A (fr)
SG (1) SG155801A1 (fr)
WO (1) WO2009120153A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101007545B1 (ko) 2009-12-11 2011-01-14 광신철강산업(주) 철근 이음부에 나사부를 형성하는 방법 및 장치
CN103273645B (zh) * 2013-05-31 2015-10-07 宁波汽车软轴软管有限公司 软管压纹切断机
CN109465366A (zh) * 2018-12-05 2019-03-15 中山市固耐特金属制品有限公司 一种螺丝杆的精准搓牙工艺
CN112454489B (zh) * 2020-11-03 2021-11-30 山东大学 软管切裁装置
CN114713653A (zh) * 2022-03-24 2022-07-08 上海工程技术大学 一种车用螺纹齿长杆零件加工方法及成型模具组件

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5592241A (en) * 1978-12-29 1980-07-12 Shinjiyou Seisakusho:Kk Production of separator for concrete mold
KR840001336B1 (ko) * 1980-02-06 1984-09-19 구보다 덱고오 가부시기가이샤 통형(筒型) 주조품의 내면 가공방법
FR2639054B2 (fr) * 1988-02-03 1992-07-03 Techniport Sa Perfectionnements apportes a la liaison mecanique de ronds a beton, procede de realisation de telles liaisons et rond a beton obtenu par la mise en oeuvre dudit procede
KR100248963B1 (ko) * 1998-03-31 2000-03-15 정경옥 콘크리트 보강용 이형봉강의 연결부 구조와 그 연결부의 가공방법

Also Published As

Publication number Publication date
KR20100027242A (ko) 2010-03-10
CN101965236A (zh) 2011-02-02
SG155801A1 (en) 2009-10-29
WO2009120153A1 (fr) 2009-10-01

Similar Documents

Publication Publication Date Title
CA2469583C (fr) Raccord de barre d'armature a haute adherence, et methode d'utilisation
TW440482B (en) Manufacture method for concrete-strengthening deformed reinforcement bar and its connecting ends
US9266165B2 (en) Method for hot forging threads into an end of a steel bar
WO2009120153A9 (fr) Procédé pour réaliser un filetage sur une barre de renfort déformée
TW201321615A (zh) 盲鉚釘及工作件配置
KR100820184B1 (ko) 철근의 나사부 가공방법
US6735994B2 (en) Forging of workpieces
US20040161305A1 (en) Radially deformed anchorage bolt
JP3370245B2 (ja) 鉄筋の継手構造
KR100316435B1 (ko) 콘크리트보강용 이형봉강의 연결단부 가공방법과 이 방법에 의해 가공된 이형봉강 및 이형봉강의 연결구조.
JP4906849B2 (ja) 鋼管の拡管成形方法および鋼管の拡管成形装置
KR100907398B1 (ko) 정착부가 부착된 철근의 제조방법
CA3078950A1 (fr) Fin de course pour un ensemble boulon de cable
KR101007545B1 (ko) 철근 이음부에 나사부를 형성하는 방법 및 장치
JPH06330525A (ja) 異形差筋アンカーとその製造法
WO2023069008A1 (fr) Procédé de travail d'un filetage sur une barre d'armature pour l'armature du béton
RU2385199C2 (ru) Способ получения теплообменных труб с профилированными законцовками
DE102005044228A1 (de) Verbindungsvorrichtung mit einem Verbindungselement und einem Zugmittel sowie Verfahren zur Herstellung einer Verbindung
KR20100110420A (ko) 이형철근의 나사부 가공공법
KR20020094935A (ko) 콘크리트용 이형봉강의 연결단부 단조가공방법
EP1382404B1 (fr) Méthode, rouleau et machine de fluotournage pour le formage d' un moyeu cylindrique sans enlèvement de copeaux
KR20010077286A (ko) 콘크리트보강용 이형봉강의 연결단부 가공방법과 이 방법에 의해 가공된 이형봉강 및 이형봉강의 연결단부
KR20170078454A (ko) 가변 두께 튜브의 제작 방법
DE102004059092A1 (de) Verfahren und Werkzeug zur Herstellung eines warmgefertigten nahtlosen Rohres aus hochwarmfesten Stählen
JPH09225525A (ja) テーパー鋼管の製造法

Legal Events

Date Code Title Description
WWE Wipo information: entry into national phase

Ref document number: 200880109160.2

Country of ref document: CN

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 08873602

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 20107002114

Country of ref document: KR

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 08873602

Country of ref document: EP

Kind code of ref document: A1