EP0633816A1 - A method for manufacturing a mesh reinforcement - Google Patents
A method for manufacturing a mesh reinforcementInfo
- Publication number
- EP0633816A1 EP0633816A1 EP92908404A EP92908404A EP0633816A1 EP 0633816 A1 EP0633816 A1 EP 0633816A1 EP 92908404 A EP92908404 A EP 92908404A EP 92908404 A EP92908404 A EP 92908404A EP 0633816 A1 EP0633816 A1 EP 0633816A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- main bars
- welding
- transverse
- mesh reinforcement
- welding station
- Prior art date
- Legal status (The legal status 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 status listed.)
- Withdrawn
Links
- 230000002787 reinforcement Effects 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 50
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000004568 cement Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F27/00—Making wire network, i.e. wire nets
- B21F27/08—Making wire network, i.e. wire nets with additional connecting elements or material at crossings
- B21F27/10—Making wire network, i.e. wire nets with additional connecting elements or material at crossings with soldered or welded crossings
Definitions
- the present invention relates to a method for manufacturing a mesh reinforcement, in which the main bars of the mesh reinforcement, said main bars being of normal ribbed bar, are fed parallelly and step-wise to a welding station at a controlled distance from each other, and its transverse reinforcements are placed, at the welding station, indivi ⁇ dually in position on top of the main bars and welded together with these.
- the method according to the invention for manufacturing a mesh reinforcement is characterized in that the welding of the transverse reinforcements is performed with two spot welding heads, whose actuators are located on the opposite sides of a welding station, which welding heads may be controUably transferred in the transverse direction of the mesh reinforcement along the transverse reinforcement to be welded together and which are arranged to stop automatical- ly at every main bar within its moving area and to perform there the spot welding function. Since a considerably thick ribbed bar may be used, a sufficient strength is obtained for the concrete structures by means of a simple reinforce ⁇ ment at the same time as it is ensured that the transverse reinforcement will certainly fix to every main bar. By means of the invention, it is possible to industrially manufacture such mesh reinforcements provided with strength properties, which cannot have been previously manufactured economically.
- Fig. 1 is a principle view of an equipment to be utilized in the performance of the method according to the inven ⁇ tion, seen from the top, and
- Fig 2 shows the equipment of Fig. 1, seen from the right, at a welding station.
- the manufacturing of the mesh reinforcement occurs in such a way that the main bars 1 of the mesh reinforcement are fed parallelly and step-wise to a welding station 2 at a controlled distance from each other.
- the transverse reinforcements 3 are placed, at the welding station 2, individually in position on top of the main bars 1 and are spot welded to each main bar 1 in turn.
- the main bars 1 are of a normal ribbed bar, which by its strength proper ⁇ ties is completely superior to a rod wire.
- the ribbed bars to be used as main bars 1 may have a cross-section of 8-32 mm of standard ribbed bar HW.
- the spot welding of the transverse reinforcements 3 is preferably performed with two spot welding heads 4, which are controUably transferable on guide arms 5 in the trans ⁇ verse direction of the mesh reinforcement.
- Actuators 6 of the spot welding heads 4 are located on the opposite sides of the welding station 2.
- the welding station 2 has a metal table 7 supporting the main bars 1. On the upper surface of the table 7 preferably two adjacent stops 8 are placed such that a transverse reinforcement 6 to be welded and being placed against them is located accurately on the movement path of the spot welding heads 4.
- a new transverse reinforcement 3 is placed on top of the main bars 1 against said stops 8, the welding functions of both spot welding heads 4 are actu ⁇ ated, whereby both welding heads 4 transfer from the ini- tial positions on opposite sides of the mesh reinforcement along the transverse reinforcement 3 to be welded toward the center line of the mesh reinforcement, till each spot welding head 4 reaches the outermost main bar 1 of the side concerned, whereby the horizontal movement of the spot welding head 4 automatically stops and a first actual spot welding step begins.
- each welding head 4 is then pushed downward and presses the transverse reinfor ⁇ cement 3 toward the main bar 1 concerned at the same time as the welding voltage is connected between the electrode 9 and the welding-station table 7 such that a spot-like weld is obtained. ⁇ fter the weld has been obtained, the electrode 9 automatically rises to its basic position, after which the spot welding head 4 moves along the trans ⁇ verse reinforcement 3 to the next main bar 1, whereby the spot welding step is repeated. When all main bars in turn have been spot welded onto this transverse reinforcement 3, the spot welding heads 4 return to their initial positions.
- the mesh reinfor- cements may be cut to a fixed size by means of a cutting device 10 located on the outlet end of the welding station
- This stop is prefera ⁇ bly of a lever arm type, which, after the mesh reinforce ⁇ ment has collided against it, is capable of sending a stopping impulse to a feeding device 12 of the main bars 1 as well as of giving a starting signal to the cutting device 10.
- the distance between adjacent main bars 1 is adjusted preferably on the inlet side of the welding station by means of axially adjustably transferable guide rollers 14 pivoted around two parallel shafts 13.
- guide rollers 14 By arranging the guide rollers 14 on two shafts 13 such that the guide rollers 14 of two adjacent main bars 1 are located on different shafts 13, also the manufacturing of such mesh reinforcements is made possible, in which the main bars 1 are nearly in contact with each other.
- the feeding device 12 for the main bars 1 is preferably a reciprocating gripping and pushing device, which during the pushing step is arranged to grip all main bars 1 by means of grip beams forming a pressing gap such that the main bars 1 move forward by one step during every pushing step.
- the grip beams are in an opened position and move freely to the initial position of the feeding device 12, in which positi ⁇ on they again grip the main bars 1.
- the distance between the transverse reinforcements 3 is thus determined easily according to the lenght of the feeding step of the main bars.
- the distance between the transverse reinforcements 3 may thus be of a length of either one or more feeding steps. If necessary, the machine operator may interrupt the feeding device 12 during the pushing step and start up the welding function, if the distance between the transverse reinforcements 3 is to be smaller than the feeding step of the main bars.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Wire Processing (AREA)
Abstract
The invention relates to a method for manufacturing a mesh reinforcement, in which the main bars (1) of the mesh reinforcement, said main bars (1) being of normal ribbed bar, are fed parallelly and step-wise to a welding station (2) at a controlled distance from each other, and its transverse reinforcements (3) are placed at the welding station (2) individually in position on top of the main bars (1) and welded together with these. The invention is characterized in that the welding of the transverse reinforcements (3) is performed with two spot welding heads (4), whose actuators (6) are located on the opposite sides of the welding station (2), which welding heads may be controllably transferred in the transverse direction of the mesh reinforcement along the transverse reinforcement (3) to be welded and which are arranged to stop automatically at each main bar (1) within its moving area and to perform there the spot welding function.
Description
-- - -- !- A method for manufacturing a mesh reinforcement
The present invention relates to a method for manufacturing a mesh reinforcement, in which the main bars of the mesh reinforcement, said main bars being of normal ribbed bar, are fed parallelly and step-wise to a welding station at a controlled distance from each other, and its transverse reinforcements are placed, at the welding station, indivi¬ dually in position on top of the main bars and welded together with these.
Previously, mesh reinforcements were usally welded such that each transverse reinforcement was welded simultaneous¬ ly together with all main bars by using a long welding brush, which extended across the entire mesh reinforcement. Such a method makes very large demands upon the uniformity of the reinforcement bars, and its power requirement is extremely high. Due to this matter, it has previously been possible to use only a normal rod wire with a cross-section of 12 mm at the highest, which does not provide a suffi¬ cient strength for concrete structures in all conditions. In spite of the rod wire, the contact between the transver¬ se reinforcements and the main rods is relatively uncer¬ tain, which results in that the transverse reinforcement is not properly welded together with all main rods.
The method according to the invention for manufacturing a mesh reinforcement is characterized in that the welding of the transverse reinforcements is performed with two spot welding heads, whose actuators are located on the opposite sides of a welding station, which welding heads may be controUably transferred in the transverse direction of the mesh reinforcement along the transverse reinforcement to be welded together and which are arranged to stop automatical- ly at every main bar within its moving area and to perform there the spot welding function. Since a considerably thick
ribbed bar may be used, a sufficient strength is obtained for the concrete structures by means of a simple reinforce¬ ment at the same time as it is ensured that the transverse reinforcement will certainly fix to every main bar. By means of the invention, it is possible to industrially manufacture such mesh reinforcements provided with strength properties, which cannot have been previously manufactured economically.
The other characteristics of the invention are presented in the enclosed claims 1 to 7.
The invention is next described in more detail with refe¬ rence to the accompanying drawing, in which
Fig. 1 is a principle view of an equipment to be utilized in the performance of the method according to the inven¬ tion, seen from the top, and
Fig 2 shows the equipment of Fig. 1, seen from the right, at a welding station.
According to the invention, the manufacturing of the mesh reinforcement occurs in such a way that the main bars 1 of the mesh reinforcement are fed parallelly and step-wise to a welding station 2 at a controlled distance from each other. The transverse reinforcements 3 are placed, at the welding station 2, individually in position on top of the main bars 1 and are spot welded to each main bar 1 in turn. In the method according to the invention, the main bars 1 are of a normal ribbed bar, which by its strength proper¬ ties is completely superior to a rod wire. The ribbed bars to be used as main bars 1 may have a cross-section of 8-32 mm of standard ribbed bar HW.
The spot welding of the transverse reinforcements 3 is preferably performed with two spot welding heads 4, which
are controUably transferable on guide arms 5 in the trans¬ verse direction of the mesh reinforcement. Actuators 6 of the spot welding heads 4 are located on the opposite sides of the welding station 2.
The welding station 2 has a metal table 7 supporting the main bars 1. On the upper surface of the table 7 preferably two adjacent stops 8 are placed such that a transverse reinforcement 6 to be welded and being placed against them is located accurately on the movement path of the spot welding heads 4. When a new transverse reinforcement 3 is placed on top of the main bars 1 against said stops 8, the welding functions of both spot welding heads 4 are actu¬ ated, whereby both welding heads 4 transfer from the ini- tial positions on opposite sides of the mesh reinforcement along the transverse reinforcement 3 to be welded toward the center line of the mesh reinforcement, till each spot welding head 4 reaches the outermost main bar 1 of the side concerned, whereby the horizontal movement of the spot welding head 4 automatically stops and a first actual spot welding step begins. The electrode of each welding head 4 is then pushed downward and presses the transverse reinfor¬ cement 3 toward the main bar 1 concerned at the same time as the welding voltage is connected between the electrode 9 and the welding-station table 7 such that a spot-like weld is obtained. Λfter the weld has been obtained, the electrode 9 automatically rises to its basic position, after which the spot welding head 4 moves along the trans¬ verse reinforcement 3 to the next main bar 1, whereby the spot welding step is repeated. When all main bars in turn have been spot welded onto this transverse reinforcement 3, the spot welding heads 4 return to their initial positions.
In connection with the welding function, the mesh reinfor- cements may be cut to a fixed size by means of a cutting device 10 located on the outlet end of the welding station
2 and by means of a stop 11 in cooperation therewith, which
stop 11 is controUably transferable in the longitudinal direction of the mesh reinforcement. This stop is prefera¬ bly of a lever arm type, which, after the mesh reinforce¬ ment has collided against it, is capable of sending a stopping impulse to a feeding device 12 of the main bars 1 as well as of giving a starting signal to the cutting device 10.
The distance between adjacent main bars 1 is adjusted preferably on the inlet side of the welding station by means of axially adjustably transferable guide rollers 14 pivoted around two parallel shafts 13. By arranging the guide rollers 14 on two shafts 13 such that the guide rollers 14 of two adjacent main bars 1 are located on different shafts 13, also the manufacturing of such mesh reinforcements is made possible, in which the main bars 1 are nearly in contact with each other.
The feeding device 12 for the main bars 1 is preferably a reciprocating gripping and pushing device, which during the pushing step is arranged to grip all main bars 1 by means of grip beams forming a pressing gap such that the main bars 1 move forward by one step during every pushing step. During the return movement of the pushing device 12, the grip beams are in an opened position and move freely to the initial position of the feeding device 12, in which positi¬ on they again grip the main bars 1. The distance between the transverse reinforcements 3 is thus determined easily according to the lenght of the feeding step of the main bars. The distance between the transverse reinforcements 3 may thus be of a length of either one or more feeding steps. If necessary, the machine operator may interrupt the feeding device 12 during the pushing step and start up the welding function, if the distance between the transverse reinforcements 3 is to be smaller than the feeding step of the main bars.
Claims
1. A method for manufacturing a mesh reinforcement, in which the main bars (1) of the mesh reinforcement, said main bars (1) being of normal ribbed bar, are fed parallel¬ ly and step-wise to a welding station (2) at a controlled distance from each other, and its transverse reinforcements (3) are placed, at the welding station (2), individually in position on top of the main bars (1) and welded together with these, characterized in that the welding of the trans¬ verse reinforcements (3) is performed with two spot welding heads (4), whose actuators (6) are located on the opposite sides of the welding station (2), which welding heads are controUably transferable in the transverse direction of the mesh reinforcement along the transverse reinforcement (3) to be welded and which are arranged to stop automati¬ cally at each main bar il) within its moving area and to perform there the spot welding function.
2. A method according to Claim 1, characterized in that the orientation of the transverse reinforcement to be welded occurs by means of upwardly projecting stops (8) located on a table (7) of the welding station (2).
3. A method according to Claim 2, characterized in that the main bars (1) have a cross-section of 8-32 mm of standard ribbed bar HW.
4. A method according to Claim 3, characterized in that the welded mesh reinforcement is cut to a fixed size by means of a cutting device (10) located on the outlet side of the welding station (2) and by means of a stop (11) cooperating therewith, which may be controUably transferred in the longitudinal direction of the mesh reinforcement.
5. A method according to Claim 4, characterized in that the distance between adjacent main bars (1) is adjusted prefe- rably on the inlet side of the welding station (2) by means of axially adjustably transferable guide rollers (14) pivoted on two parallel shafts (13).
6. A method according to Claim 5, characterized in that the feeding of the main bars (1) to the welding station (2) is performed by means of a reciprocating pushing device (12) simultaneously gripping all main bars (1).
7. A method according to Claim 6, characterized in that the distance between the transverse reinforcements (3) is determined according to a feeding step of the main bars (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI904914A FI88327C (en) | 1990-10-05 | 1990-10-05 | Method of making a reinforcing mesh |
| PCT/FI1992/000102 WO1993019868A1 (en) | 1990-10-05 | 1992-04-03 | A method for manufacturing a mesh reinforcement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0633816A1 true EP0633816A1 (en) | 1995-01-18 |
Family
ID=8531177
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92908404A Withdrawn EP0633816A1 (en) | 1990-10-05 | 1992-04-03 | A method for manufacturing a mesh reinforcement |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0633816A1 (en) |
| FI (1) | FI88327C (en) |
| WO (1) | WO1993019868A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITUD20030072A1 (en) * | 2003-03-28 | 2004-09-29 | Piegatrici Macch Elettr | MACHINE FOR REALIZING METAL NETWORKS AND RELATED METHOD OF REALIZATION. |
| IT1392866B1 (en) * | 2009-02-20 | 2012-04-02 | Schnell Spa | METHOD AND EQUIPMENT FOR REALIZING REINFORCED CONCRETE REINFORCEMENTS |
| GR1008523B (en) | 2014-04-01 | 2015-07-09 | Αντωνιος Παναγιωτη Αναγνωστοπουλος | Method and system for feeding mesh-producing machinery with longitudinal wires or iron rods |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE539143A (en) * | 1954-06-21 | |||
| US3602269A (en) * | 1969-10-31 | 1971-08-31 | Evg Entwicklung Verwert Ges | Wire mesh welding machine |
| US4343981A (en) * | 1980-09-08 | 1982-08-10 | Connolly James D | Resistance welding machine |
| JPS5925379U (en) * | 1982-07-31 | 1984-02-16 | 株式会社タチエス | resistance welding equipment |
-
1990
- 1990-10-05 FI FI904914A patent/FI88327C/en not_active IP Right Cessation
-
1992
- 1992-04-03 EP EP92908404A patent/EP0633816A1/en not_active Withdrawn
- 1992-04-03 WO PCT/FI1992/000102 patent/WO1993019868A1/en not_active Application Discontinuation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9319868A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FI88327B (en) | 1993-01-15 |
| FI904914A0 (en) | 1990-10-05 |
| FI88327C (en) | 1994-01-03 |
| WO1993019868A1 (en) | 1993-10-14 |
| FI904914L (en) | 1992-04-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| 17P | Request for examination filed |
Effective date: 19940930 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE DE ES FR GB IT NL SE |
|
| 17Q | First examination report despatched |
Effective date: 19960605 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19961217 |