CA2299012A1 - Process for producing metal tubes, and transportation rack - Google Patents
Process for producing metal tubes, and transportation rack Download PDFInfo
- Publication number
- CA2299012A1 CA2299012A1 CA002299012A CA2299012A CA2299012A1 CA 2299012 A1 CA2299012 A1 CA 2299012A1 CA 002299012 A CA002299012 A CA 002299012A CA 2299012 A CA2299012 A CA 2299012A CA 2299012 A1 CA2299012 A1 CA 2299012A1
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- Prior art keywords
- coils
- large coils
- tubes
- coil
- process according
- Prior art date
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- Abandoned
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000002184 metal Substances 0.000 title claims abstract description 9
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 30
- 238000005098 hot rolling Methods 0.000 claims abstract description 6
- 241000239290 Araneae Species 0.000 claims description 43
- 238000004804 winding Methods 0.000 claims description 5
- 238000003892 spreading Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 2
- 239000011888 foil Substances 0.000 claims description 2
- 238000000151 deposition Methods 0.000 claims 1
- 238000003466 welding Methods 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052802 copper Inorganic materials 0.000 abstract description 10
- 239000010949 copper Substances 0.000 abstract description 10
- 238000010276 construction Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000001125 extrusion Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 238000012432 intermediate storage Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011265 semifinished product Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/16—Unwinding or uncoiling
- B21C47/18—Unwinding or uncoiling from reels or drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/22—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes specially adapted for making tubular articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/28—Drums or other coil-holders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
- B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
- B65H75/18—Constructional details
- B65H75/20—Skeleton construction, e.g. formed of wire
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Extraction Processes (AREA)
- Winding, Rewinding, Material Storage Devices (AREA)
- Pallets (AREA)
- Warehouses Or Storage Devices (AREA)
Abstract
A process for producing metal tubing, in particular copper tubes, as well as a transportation rack for the tubing wound into coils. The process permits improved utilization of the capacity of the production equipment as well as a particularly economical production. In a separate production plant, initial tubing is manufactured by extruding or hot rolling and subsequent drawing and then wound into large coils, which are deposited on racks serving as transportation and/or take-off devices. Several large coils are loaded on each rack and are transported to a tube finishing plant. The large coils are either unstacked from the racks or placed on a lowerable take-off table directly at the head of the tube finishing line, and the leading end of the coil is positioned at the working level. The coil is unwound, and then fed to a conventional drawing machine and processed further to tubes.
Description
PROCESS FOR PRODUCING METAL TUBES, AND TRANSPORTATION RACK
BACKGROUND OF THE INVENTION
1. Field of the Invention The invention relates to a process for producing metal tubes, such as copper tubes, as well as to a transportation rack for shipping the tubes wound in coils.
BACKGROUND OF THE INVENTION
1. Field of the Invention The invention relates to a process for producing metal tubes, such as copper tubes, as well as to a transportation rack for shipping the tubes wound in coils.
2. The Prior Art Copper tubes are usually manufactured from billets in a hot molding process via extruders or pilger rolls. The puddled pressed tubes are subsequently processed further with pilger rolls or by drawing. Further processing may take place by individual or multiple drawing. Further transport to the next processing stage is carried out with a basket transport system, as a rule.
It has been known heretofore to manufacture copper tubes in the production plant continuously in one line, starting with the casting of the billets followed by the hot molding process, and ending with the final drawing process. The costs for purchasing the extrusion plants employed for the hot molding process are very high, and such equipment has a high production capacity.
However, for the special production of copper tubes, the capacity of an extrusion plant can only be partially utilized even by producers manufacturing copper tubing in large volumes. The manufacture of other product lines on such equipment such as, sections or bars, does lead to improved utilization of the capacity of the extrusion plant. However, this also results in considerable additional costs due to the required refitting work, which have an adverse effect on the price of the semifinished products. Furthermore, the plant is shut down for the refitting work, which leads to further costs.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a process for the production of metal tubes made of metal, in particular copper tubes, that permits improved utilization of the capacity of the production equipment, as well as economical production, and by which finished tubes can be produced simply at favorable costs.
It is another object of the invention to provide a suitable transportation rack for shipping the tubing wound into large coils.
The proposed discontinuous procedure for producing copper tubes, at two locally separated production sites, first in the form of a preliminary product and at a later time as a finished product, significantly lowers the overall manufacturing cost of such tubes. In a first production plant, initial tubes that can be wound into coils are first produced by extruding or hot rolling, and drawing. The stages extruding and hot rolling, which each are followed by drawing, are carried out via technology that is generally known and commonly utilized in the field of manufacture of copper tubing.
Following drawing of the tubes on a continuous drawing machine into initial tubes with an outside diameter of from 35 to 80 mm and a wall thickness of from 1.5 to 4.0 mm, the initial tubes are wound into large coils on a suitable winding machine.
The large coils are preferably wound layer on layer into so-called "LWC~~-coils with a constant inside diameter of at least 800 mm, and a maximum outside diameter of up to 3500 mm. LWC-tubes have been used heretofore only for near-end dimensions, i.e, the wall thickness is smaller than or equal to 1 mm. The use of initial tubes for further drawing having a wall thickness in excess of 1 mm, such as 44 by 2 mm, or 44 by 1.65 mm, has not been known. Large coils with a unit weight of 400 to 1500 kg are obtained depending on the outside diameter and the wall thickness of the initial tubing.
It has been known heretofore to manufacture copper tubes in the production plant continuously in one line, starting with the casting of the billets followed by the hot molding process, and ending with the final drawing process. The costs for purchasing the extrusion plants employed for the hot molding process are very high, and such equipment has a high production capacity.
However, for the special production of copper tubes, the capacity of an extrusion plant can only be partially utilized even by producers manufacturing copper tubing in large volumes. The manufacture of other product lines on such equipment such as, sections or bars, does lead to improved utilization of the capacity of the extrusion plant. However, this also results in considerable additional costs due to the required refitting work, which have an adverse effect on the price of the semifinished products. Furthermore, the plant is shut down for the refitting work, which leads to further costs.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a process for the production of metal tubes made of metal, in particular copper tubes, that permits improved utilization of the capacity of the production equipment, as well as economical production, and by which finished tubes can be produced simply at favorable costs.
It is another object of the invention to provide a suitable transportation rack for shipping the tubing wound into large coils.
The proposed discontinuous procedure for producing copper tubes, at two locally separated production sites, first in the form of a preliminary product and at a later time as a finished product, significantly lowers the overall manufacturing cost of such tubes. In a first production plant, initial tubes that can be wound into coils are first produced by extruding or hot rolling, and drawing. The stages extruding and hot rolling, which each are followed by drawing, are carried out via technology that is generally known and commonly utilized in the field of manufacture of copper tubing.
Following drawing of the tubes on a continuous drawing machine into initial tubes with an outside diameter of from 35 to 80 mm and a wall thickness of from 1.5 to 4.0 mm, the initial tubes are wound into large coils on a suitable winding machine.
The large coils are preferably wound layer on layer into so-called "LWC~~-coils with a constant inside diameter of at least 800 mm, and a maximum outside diameter of up to 3500 mm. LWC-tubes have been used heretofore only for near-end dimensions, i.e, the wall thickness is smaller than or equal to 1 mm. The use of initial tubes for further drawing having a wall thickness in excess of 1 mm, such as 44 by 2 mm, or 44 by 1.65 mm, has not been known. Large coils with a unit weight of 400 to 1500 kg are obtained depending on the outside diameter and the wall thickness of the initial tubing.
The large coils can be stored intermediately and shipped immediately after their manufacture to a second production plant, using suitable transportation means. The large coils are stacked on suitable transportation or shipping racks, with three to six large coils per rack. The transportation racks with the large coils are then loaded via lifting gear on the loading bed of the transportation vehicle, for example a flat-bed truck, and transported to the final manufacturing site. So-called spiders can be employed as transportation racks, on which the large coils are stacked in lying positions, i.e. in a horizontal arrangement.
Alternatively, several large coils can be welded as a composite into a shrunk-on foil, which are loaded and stored horizontally on flat pallets. According to another variation, the large coils are loaded in upright positions on prism-like pallets, which can be provided with a felt lining.
The further processing of the large coils into finished tubes can be carried out either directly from the transportation means, or via a facility for intermediate storage. Further processing of the large coils transported to the production site is carried out on commonly employed continuous drawing machines.
If the large coils are transported on spiders, the spiders serve as transporting, storing and/or unwinding means. If the large coils are transported to the production plant loaded lying horizontally on spiders or flat pallets, the racks with the large coils can be placed on a lowerable take-off table, located directly in front of the unwinding or take-off reel. The leading end of the uppermost large coil is then positioned at the required working level by lowering the take-off table.
It is also possible to remove the large coils from the racks individually and to transport them to the drawing machine with a fork-lift truck. The leading end of the coil is then fed to a separate take-off device by an inside gripper device. This variation permits pointing of the leading end of the coil as the preceding coil is being drawn, and the construction of the unwinding reel can be simplified. Auxiliary time periods required for these working steps can thus be shortened. It may also be possible to adjust the large coils to a "soft~~ state of strength by an additional heat treatment carried out prior to the final drawing process.
The proposed production procedure offers the advantage that the production equipment for manufacturing the initial tube products can be utilized at full capacity. Large coils can be produced very inexpensively, which then can be sold to third parties as intermediate products. The final producer then only needs a continuous drawing machine with the usual additional gear and equipment for producing tubing with the desired dimensions.
The benefits gained from the particularly economical centralized production of the initial tubing outweigh the additional transportation costs. Since the large coils are already drawn to a wall thickness of 1.5 to 4.0 mm, one draw can usually be omitted in the final production.
A suitable intermediate transportation rack is a metal spider. The use of spiders for coils of tubing wound has not been known heretofore. The proposed tube construction of the spiders makes it possible to stack the spiders as empties, and it is possible to stack at least three spiders into each other. This ensures inexpensive shipping of the empty spiders. So as to completely exclude slipping of the large coils from the spider in the course of transportation, the intermediate space between the shaft of the spider and the inner side of the large coils can be compensated by an inflatable air cushion element. According to another variation, the large coils are locked by a spreading device that can be secured on the shaft.
The spiders also offer an advantage in that the initial copper tubing, which is wound in layers for further processing, can run off the spider directly without first having to unstack the coils from the spider.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and features of the present invention will become apparent from the following detailed description con-sidered in connection with the accompanying drawings. It is to be understood, however, that the drawings are designed as an illustration only and not as a definition of the limits of the invention.
In the drawings, wherein similar reference characters denote similar elements throughout the several views:
FIG. 1 shows a top view of a spider for large coils;
FIG. 2 is a front view of the spider according to FIG. 1;
and FIG. 3 is a perspective view of a large "LWC~~ coil.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now in detail to the drawings, at a central manufacturing plant, in a prefabricating line consisting of a conventional extruder press and a continuous drawing machine, initial tubing with an outside diameter of 50 mm and a wall thickness of 3 mm is pressed by extruding copper billets. This tubing is processed further by subsequently drawing it in one drawing step into initial tubing with dimensions of 44 by 2 mm.
The initial tubing is then wound layer to layer on a conventional winding machine into a large LWC-coil with an outside diameter of 2175 mm and an inside diameter of 1250 mm, with a winding height of 350 mm. The large coil has a weight of 1000 kg and the length of the wound tubing material amounts to 426 meters per large coil. Five (5) large coils are horizontally stacked on each spider. The flatbeds of a truck with trailer are loaded with 5 spiders each carrying 5 large coils. The large coils are shipped in this way from the central manufacturing location to the various processors of the tubing.
At the location where the tubing is processed further, the spiders are unloaded from the truck by fork-lift trucks, transported by a chain conveyor to a lifting table, and deposited upright on the table. The lifting table lowers the spider by about 400 mm, placing it on receiving forks. The forks then drive the spider over the unwinding reel. The reel crown takes over the spider by lifting it up, and the forks drive back into their starting positions. The take-off reel or take-off table is lowered by about 2 meters until the uppermost coil is positioned at the level of the draw-in line. The leading end of the tubing of the uppermost coil is positioned at the working level and the required tangent is attached.
The take-off reel is designed for a circumferential take-off speed of up to 100 m/min. The speed is synchronized between the take-off reel and the continuous drawing machine. The leading end of the tubing is inserted in the bending apparatus and fed to the pointing unit, which is filled with the lubricant and where the mandrels are set and the pointing is carried out. Thereafter, the leading end of the tubing is inserted in the driving apparatus and fed to the drawing machine.
On the drawing machine, a tubing with the dimensions 42 by 1.5 mm is drawn by one draw from the 44 by 2 mm initial tubing material, and then placed in a basket, which is transported to the next drawing machine downstream in order to carry out the next production draw. As the next-following coil is being taken off, the take-off table is continuously driven to the top at a rate depending on the take-off speed, so that the unwinding tubing is always positioned at the working level. After all coils have been taken off from the spider, the spider is removed from the take-off table, and another loaded spider is driven to the take-off table in the manner described above.
According to another embodiment, the spiders are unstacked at the tube processor's plant as the final producer, and the large coils are loaded on a stationary take-off reel one after the other. This simplified variation permits separate pointing of the leading end of the tubing of the individual large coils as the preceding large coil is being drawn. The large coils are unstacked from the spider in this connection directly in front of the take-off reel.
According to a third embodiment, the large coils are shipped for further processing on prism-like pallets. The prism pallets are lifted from the truck and subsequently unstacked, and the large coils are then transferred to the chain conveyor already in the form of singled units.
All other working steps are carried out analogous to the procedure explained above.
FIG. 3 shows a large LWC coil 9. Coil 9 may also consist of a 44 by 1.65 mm tubing wound in layers, with an outside diameter OD of 2300 mm and an inside diameter ID of 1250 mm, as well as with a height H of 350 mm. The wound length of such a large coil amounts to 512 mm. The LWC coil has a weight of 1000 kg. Several of such large coils 9, for example five, are stacked on a spider according to the type of construction shown in FIGS. 1 and 2.
The spider consists of a bottom part 1 and a centrally arranged shaft 2 in the form of a welded tube construction. The bottom part 1 is formed by an inner ring 3 and an outer ring 4, which are connected with one another via the tubular pieces 5 arranged in the form of spokes. Four tubes 6 are vertically secured on the inner tube 3 and equally spaced from each other. At their top ends, the four tubes are connected with one another crosswise by the tubular bridges 7. The length and height of the tubes 6 depend on the number of large coils to be stacked on the spider.
The spiders are built very stable because they have to be capable of receiving loads of this type weighing up to 7 tons. The constructional design of the spiders makes it possible to stack such spiders as empties one into the other. The individual spiders are fitted one into another by turning them by a defined angle about the center axle, so that the bottom parts 1 of the spiders rest one on top of the other.
For securing the large coils 9 stacked on the spiders during transport on a vehicle, the following possibilities are available: A spreading device is secured on shaft 2 of the spider, by which the individual spiders are locked in their positions. According to another variation, an inflatable air cushion may be arranged around shaft 2 of the spider, which, upon inflation, fills the intermediate space between shaft 2 and the inside 10 of the large coil 9 at least partially, so that slipping of the large coil 9 during transit is excluded.
Accordingly, while only a few embodiments of the present invention have been shown and described, it is obvious that many changes and modifications may be made thereunto without departing from the spirit and scope of the invention.
Alternatively, several large coils can be welded as a composite into a shrunk-on foil, which are loaded and stored horizontally on flat pallets. According to another variation, the large coils are loaded in upright positions on prism-like pallets, which can be provided with a felt lining.
The further processing of the large coils into finished tubes can be carried out either directly from the transportation means, or via a facility for intermediate storage. Further processing of the large coils transported to the production site is carried out on commonly employed continuous drawing machines.
If the large coils are transported on spiders, the spiders serve as transporting, storing and/or unwinding means. If the large coils are transported to the production plant loaded lying horizontally on spiders or flat pallets, the racks with the large coils can be placed on a lowerable take-off table, located directly in front of the unwinding or take-off reel. The leading end of the uppermost large coil is then positioned at the required working level by lowering the take-off table.
It is also possible to remove the large coils from the racks individually and to transport them to the drawing machine with a fork-lift truck. The leading end of the coil is then fed to a separate take-off device by an inside gripper device. This variation permits pointing of the leading end of the coil as the preceding coil is being drawn, and the construction of the unwinding reel can be simplified. Auxiliary time periods required for these working steps can thus be shortened. It may also be possible to adjust the large coils to a "soft~~ state of strength by an additional heat treatment carried out prior to the final drawing process.
The proposed production procedure offers the advantage that the production equipment for manufacturing the initial tube products can be utilized at full capacity. Large coils can be produced very inexpensively, which then can be sold to third parties as intermediate products. The final producer then only needs a continuous drawing machine with the usual additional gear and equipment for producing tubing with the desired dimensions.
The benefits gained from the particularly economical centralized production of the initial tubing outweigh the additional transportation costs. Since the large coils are already drawn to a wall thickness of 1.5 to 4.0 mm, one draw can usually be omitted in the final production.
A suitable intermediate transportation rack is a metal spider. The use of spiders for coils of tubing wound has not been known heretofore. The proposed tube construction of the spiders makes it possible to stack the spiders as empties, and it is possible to stack at least three spiders into each other. This ensures inexpensive shipping of the empty spiders. So as to completely exclude slipping of the large coils from the spider in the course of transportation, the intermediate space between the shaft of the spider and the inner side of the large coils can be compensated by an inflatable air cushion element. According to another variation, the large coils are locked by a spreading device that can be secured on the shaft.
The spiders also offer an advantage in that the initial copper tubing, which is wound in layers for further processing, can run off the spider directly without first having to unstack the coils from the spider.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and features of the present invention will become apparent from the following detailed description con-sidered in connection with the accompanying drawings. It is to be understood, however, that the drawings are designed as an illustration only and not as a definition of the limits of the invention.
In the drawings, wherein similar reference characters denote similar elements throughout the several views:
FIG. 1 shows a top view of a spider for large coils;
FIG. 2 is a front view of the spider according to FIG. 1;
and FIG. 3 is a perspective view of a large "LWC~~ coil.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now in detail to the drawings, at a central manufacturing plant, in a prefabricating line consisting of a conventional extruder press and a continuous drawing machine, initial tubing with an outside diameter of 50 mm and a wall thickness of 3 mm is pressed by extruding copper billets. This tubing is processed further by subsequently drawing it in one drawing step into initial tubing with dimensions of 44 by 2 mm.
The initial tubing is then wound layer to layer on a conventional winding machine into a large LWC-coil with an outside diameter of 2175 mm and an inside diameter of 1250 mm, with a winding height of 350 mm. The large coil has a weight of 1000 kg and the length of the wound tubing material amounts to 426 meters per large coil. Five (5) large coils are horizontally stacked on each spider. The flatbeds of a truck with trailer are loaded with 5 spiders each carrying 5 large coils. The large coils are shipped in this way from the central manufacturing location to the various processors of the tubing.
At the location where the tubing is processed further, the spiders are unloaded from the truck by fork-lift trucks, transported by a chain conveyor to a lifting table, and deposited upright on the table. The lifting table lowers the spider by about 400 mm, placing it on receiving forks. The forks then drive the spider over the unwinding reel. The reel crown takes over the spider by lifting it up, and the forks drive back into their starting positions. The take-off reel or take-off table is lowered by about 2 meters until the uppermost coil is positioned at the level of the draw-in line. The leading end of the tubing of the uppermost coil is positioned at the working level and the required tangent is attached.
The take-off reel is designed for a circumferential take-off speed of up to 100 m/min. The speed is synchronized between the take-off reel and the continuous drawing machine. The leading end of the tubing is inserted in the bending apparatus and fed to the pointing unit, which is filled with the lubricant and where the mandrels are set and the pointing is carried out. Thereafter, the leading end of the tubing is inserted in the driving apparatus and fed to the drawing machine.
On the drawing machine, a tubing with the dimensions 42 by 1.5 mm is drawn by one draw from the 44 by 2 mm initial tubing material, and then placed in a basket, which is transported to the next drawing machine downstream in order to carry out the next production draw. As the next-following coil is being taken off, the take-off table is continuously driven to the top at a rate depending on the take-off speed, so that the unwinding tubing is always positioned at the working level. After all coils have been taken off from the spider, the spider is removed from the take-off table, and another loaded spider is driven to the take-off table in the manner described above.
According to another embodiment, the spiders are unstacked at the tube processor's plant as the final producer, and the large coils are loaded on a stationary take-off reel one after the other. This simplified variation permits separate pointing of the leading end of the tubing of the individual large coils as the preceding large coil is being drawn. The large coils are unstacked from the spider in this connection directly in front of the take-off reel.
According to a third embodiment, the large coils are shipped for further processing on prism-like pallets. The prism pallets are lifted from the truck and subsequently unstacked, and the large coils are then transferred to the chain conveyor already in the form of singled units.
All other working steps are carried out analogous to the procedure explained above.
FIG. 3 shows a large LWC coil 9. Coil 9 may also consist of a 44 by 1.65 mm tubing wound in layers, with an outside diameter OD of 2300 mm and an inside diameter ID of 1250 mm, as well as with a height H of 350 mm. The wound length of such a large coil amounts to 512 mm. The LWC coil has a weight of 1000 kg. Several of such large coils 9, for example five, are stacked on a spider according to the type of construction shown in FIGS. 1 and 2.
The spider consists of a bottom part 1 and a centrally arranged shaft 2 in the form of a welded tube construction. The bottom part 1 is formed by an inner ring 3 and an outer ring 4, which are connected with one another via the tubular pieces 5 arranged in the form of spokes. Four tubes 6 are vertically secured on the inner tube 3 and equally spaced from each other. At their top ends, the four tubes are connected with one another crosswise by the tubular bridges 7. The length and height of the tubes 6 depend on the number of large coils to be stacked on the spider.
The spiders are built very stable because they have to be capable of receiving loads of this type weighing up to 7 tons. The constructional design of the spiders makes it possible to stack such spiders as empties one into the other. The individual spiders are fitted one into another by turning them by a defined angle about the center axle, so that the bottom parts 1 of the spiders rest one on top of the other.
For securing the large coils 9 stacked on the spiders during transport on a vehicle, the following possibilities are available: A spreading device is secured on shaft 2 of the spider, by which the individual spiders are locked in their positions. According to another variation, an inflatable air cushion may be arranged around shaft 2 of the spider, which, upon inflation, fills the intermediate space between shaft 2 and the inside 10 of the large coil 9 at least partially, so that slipping of the large coil 9 during transit is excluded.
Accordingly, while only a few embodiments of the present invention have been shown and described, it is obvious that many changes and modifications may be made thereunto without departing from the spirit and scope of the invention.
Claims (17)
1. A process for producing windable metal tubes, comprising:
- forming tubes by one of the processes of extruding and hot rolling, and subsequent drawing, winding the tubes into large coils, placing the coils on racks serving as a transportation and take-off devices, wherein several coils are stacked on each rack, transporting the racks with the large coils to a tube finishing plant;
- unstacking the large coils from the racks directly at the head of a tube production line;
- positioning a leading end of the coil at a working level;
unwinding the coil and feeding the coil to a conventional drawing machine, and;
- processing the coil further to tubes.
- forming tubes by one of the processes of extruding and hot rolling, and subsequent drawing, winding the tubes into large coils, placing the coils on racks serving as a transportation and take-off devices, wherein several coils are stacked on each rack, transporting the racks with the large coils to a tube finishing plant;
- unstacking the large coils from the racks directly at the head of a tube production line;
- positioning a leading end of the coil at a working level;
unwinding the coil and feeding the coil to a conventional drawing machine, and;
- processing the coil further to tubes.
2. The process according to claim 1, wherein the initial tubes produced by extruding or hot rolling and subsequent drawing are drawn by several draws into tubes with an outside diameter of 35 to 80 mm and a wall thickness of from 1.5 to 4.0 mm.
3. The process according to claim 1, wherein the drawn tubes are wound into large coils with a unit weight of 400 to 1500 kg.
4. The process according to claim 1, wherein the large coils are wound layer to layer and have a maximum outside diameter of up to 3500 mm and a constant inside diameter of at least 800 mm.
5. The process according to claim 1, further comprising heat-treating the large coils prior to final drawing so that the coils are in a "soft" state of strength.
6. The process according to claim 1, wherein three to seven large coils are stacked on each rack.
7. The process according to claim 1, wherein the racks are selected from the group consisting of spiders, flat pallets and prism pallets.
8. The process according to claim 1, further comprising the steps of welding the large coils as composites into shrunk-on foil and loading the welded coils on flat pallets.
9. The process according to claim 1, wherein the large coils are transported lying on spiders or flat pallets.
10. The process according to claim 1, wherein the stacked large coils are singled.
11. The process according to claim 1, wherein the steps of positioning, unwinding and feeding comprise positioning a rack with several large coils on a take-off device and feeding the leading ends of the large coils one after the other to a single or multiple drawing plant for drawing to a finished measure.
12. The process according to claim 1, wherein the large coils are singled and wherein the steps of positioning, unwinding and feeding comprise separately positioning each large coil on a take-off device and feeding the leading end of the coil to a single or multiple drawing plant for drawing to the finished measure.
13. A process for producing windable metal tubes, comprising:
- forming tubes by one of the processes of extruding and hot rolling, and subsequent drawing, winding the tubes into large coils, placing the coils on racks serving as a transportation and take-off devices, wherein several coils are stacked on each rack, transporting the racks with the large coils to a tube finishing plant;
- depositing the rack with the large coils on a lowerable take-off table, positioning a leading end of the coil at a working level;
- unwinding the coil and feeding the coil to a conventional drawing machine, and;
- processing the coil further to tubes.
- forming tubes by one of the processes of extruding and hot rolling, and subsequent drawing, winding the tubes into large coils, placing the coils on racks serving as a transportation and take-off devices, wherein several coils are stacked on each rack, transporting the racks with the large coils to a tube finishing plant;
- depositing the rack with the large coils on a lowerable take-off table, positioning a leading end of the coil at a working level;
- unwinding the coil and feeding the coil to a conventional drawing machine, and;
- processing the coil further to tubes.
14. The process according to claim 1, wherein the large coils are transported standing upright on prism pallets.
15. A transportation rack in the form of a spider for tubes with a wall thickness of more than 1 mm wound into large coils, the large coils having a constant inside diameter, comprising:
- a bottom part comprising an inner ring and an outer ring, said rings being connected with each other by connecting elements; and - a shaft formed of vertical connecting elements being secured on the inner ring, said vertical connecting elements being connected with each other crosswise at top ends by horizontally extending connecting elements.
- a bottom part comprising an inner ring and an outer ring, said rings being connected with each other by connecting elements; and - a shaft formed of vertical connecting elements being secured on the inner ring, said vertical connecting elements being connected with each other crosswise at top ends by horizontally extending connecting elements.
16. The transportation rack according to claim 15, further comprising a spreading device arranged on the shaft for locking the large coils to the rack.
17. The transportation rack according to claim 15, further comprising an inflatable air cushion element arranged around the outer circumference of the shaft, said element, when inflated, at least partly filling an intermediate space between the shaft and an inner side of the large coils.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP99103277A EP1029606B1 (en) | 1999-02-19 | 1999-02-19 | Method for the production of metal tubes, in particular copper tubes and transport structure |
| EP99103277.2 | 1999-02-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2299012A1 true CA2299012A1 (en) | 2000-08-19 |
Family
ID=8237590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002299012A Abandoned CA2299012A1 (en) | 1999-02-19 | 2000-02-18 | Process for producing metal tubes, and transportation rack |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP1029606B1 (en) |
| AR (1) | AR022599A1 (en) |
| AT (1) | ATE224247T1 (en) |
| BR (1) | BR0000848A (en) |
| CA (1) | CA2299012A1 (en) |
| DE (1) | DE59902740D1 (en) |
| DK (1) | DK1029606T3 (en) |
| ES (1) | ES2183446T3 (en) |
| PT (1) | PT1029606E (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110934092A (en) * | 2019-12-18 | 2020-03-31 | 杭州电子科技大学 | Poultry drinking water pipe blanking device and method |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101298084B (en) * | 2008-07-03 | 2010-08-04 | 中铝洛阳铜业有限公司 | Technique for processing D type copper pipe with unequal-radius wall thickness or equal-radius wall thickness |
| CN114653778B (en) * | 2022-05-24 | 2022-09-13 | 广东科莱博科技有限公司 | Winding and unwinding equipment capable of transferring continuously |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1115679B (en) * | 1958-09-27 | 1961-10-26 | Wilhelm Stoehr Fa | Storage and circular conveyor device interacting with a pulling device and having conveyor tracks lying one above the other |
| US3827274A (en) * | 1972-10-20 | 1974-08-06 | Aetna Standard Eng Co | Strand drawing apparatus including means for preparing the leading end of the strand |
| DE2604324C3 (en) * | 1976-02-05 | 1980-07-17 | Benteler-Werke Ag Werk Neuhaus, 4790 Paderborn | Device for the continuous production of longitudinally welded pipes from strip material, in particular for the production of precision steel pipes |
| US4068971A (en) * | 1976-03-16 | 1978-01-17 | Bundy Corporation | Universal coil carrier |
| FR2528391B1 (en) * | 1982-06-09 | 1985-12-06 | Trefimetaux | DEVICE FOR HANDLING AND STORING IN STACKS OF CONTAINER BASKETS FOR WOUND PRODUCTS |
| DE3902844C1 (en) * | 1989-01-27 | 1989-11-30 | Mannesmann Ag, 4000 Duesseldorf, De | Apparatus for the automatic feeding of bull-block machines with drawing stock in strand form, especially tubes |
| DE4332140C2 (en) * | 1993-09-17 | 1995-07-20 | Mannesmann Ag | Method and device for winding and further treatment of pipes made of non-ferrous metals, in particular copper and copper alloys |
-
1999
- 1999-02-19 ES ES99103277T patent/ES2183446T3/en not_active Expired - Lifetime
- 1999-02-19 DE DE59902740T patent/DE59902740D1/en not_active Expired - Fee Related
- 1999-02-19 PT PT99103277T patent/PT1029606E/en unknown
- 1999-02-19 DK DK99103277T patent/DK1029606T3/en active
- 1999-02-19 AT AT99103277T patent/ATE224247T1/en not_active IP Right Cessation
- 1999-02-19 EP EP99103277A patent/EP1029606B1/en not_active Expired - Lifetime
-
2000
- 2000-02-15 AR ARP000100641A patent/AR022599A1/en unknown
- 2000-02-18 CA CA002299012A patent/CA2299012A1/en not_active Abandoned
- 2000-02-18 BR BR0000848-6A patent/BR0000848A/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110934092A (en) * | 2019-12-18 | 2020-03-31 | 杭州电子科技大学 | Poultry drinking water pipe blanking device and method |
| CN110934092B (en) * | 2019-12-18 | 2023-10-27 | 杭州电子科技大学 | Poultry drinking water pipe blanking device and blanking method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| PT1029606E (en) | 2003-02-28 |
| ATE224247T1 (en) | 2002-10-15 |
| EP1029606B1 (en) | 2002-09-18 |
| DE59902740D1 (en) | 2002-10-24 |
| EP1029606A1 (en) | 2000-08-23 |
| ES2183446T3 (en) | 2003-03-16 |
| AR022599A1 (en) | 2002-09-04 |
| DK1029606T3 (en) | 2002-12-30 |
| BR0000848A (en) | 2000-09-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |