EP1120175A1 - Apparatus and forming head for manufacturing a spiral pipe from a ribbed band - Google Patents

Abstract

A device for producing folded spiral-seam tubes from tape material (3), which consists at least partially of metal, comprises a profiling device (4) for forming fold edges (3a, 3b) on the tape material (3), at least one guide surface (6a) for continuing the Folded edges (3a, 3b) of band material (3), a bending device for reshaping the band material (3) by means of a reshaping surface (7) into a helical partial surface of a cylinder jacket, a fold-closing device (12) for the closing compression of the folded edges (3a, 3b) ) and a separating device (15) for separating manufactured pipe sections. Since the forming surface (7), and preferably also the at least one guide surface (6a), comprises a plastic contact surface, contamination and damage to the tube during its manufacture can be avoided. Band-shaped forming surfaces (7) are particularly advantageous because they can be easily replaced and made available for all pipe diameters that may be required with little effort. Only a small space is required for the storage of band-shaped forming surfaces (7) or forming bands (8). The preferred form tapes (8) are either made of mono- or composite plastic, or comprise a metal band made of spring steel, which is coated with low-friction plastic. <IMAGE>

Description

The invention relates to devices for the manufacture of spiral duct pipes according to the preamble of claim 1 and bending devices therefor.

For the manufacture of spiral-seam pipes or spiral pipes from strip material, at least partially made of metal, devices with a profiling device, a bending device and a folding closing device used. The profiling device forms matching edges of the band material to be joined together Folding wheels or shelves made after forming the strip material inserted into each other in the bending device and with the closing device interacting locking wheels are pressed together to form a fold connection. The strip material becomes helical in the bending device by means of a forming surface applied to a cylindrical surface, the resulting partial surface of a cylinder jacket should be referred to as helical. To each other Connecting the fold edges is preferably a single board in a double board inserted and then they protrude from the pipe surface Borders closed and preferably against the pipe outer surface pressed. The fold connection runs helically around the so produced Spiral folded tube. In order to be able to provide pipe sections with the desired length, must be a cutting device, for example a rotating cutting disc or a Roller shears are provided.

From US 4 567 742 a device is known in which the metal strip from one Drive roller pair by a profiling roller arrangement to form the side Borders or flanges and to form at least one increasing stability Longitudinal fold drawn and in a curving and sealing device with a helical Forming surface and introduced with interacting locking rollers becomes. Between the drive roller pair and the curving and closing device become guide plates with longitudinal grooves for the shelves and the longitudinal folds of the strip material used. Like the guide plates, the forming surface with grooves for provided the longitudinal folds. To manufacture spiral ducts with different diameters to be able to, the entire curving and closing device would have to be replaced become. If a device according to US 4,567,742 for the production of pipes would have to be used with many different diameters, so for a complete bending and closing device is available for every diameter, what with a large space requirement for storing all curving and closing devices connected is. For large pipe diameters in particular, these and locking devices heavy and large and therefore unwieldy when changing. Also in solutions with bending or bending devices separate from the closing device are the forming surfaces often as heavy cast heads made of aluminum educated.

A major disadvantage of this solution is that the strip material is intense Frictional contact with the metallic guide plates and the metallic forming surface to wear on the guide and forming surfaces, as well as on the strip material leads. Even when passing through the drive and / or profiling roller pairs the strip material in intensive frictional contact with corresponding abrasion. The metallic abrasion leads to visual impairments of the surface of the manufactured Spiral duct. In addition, at least with galvanized strip material, the abrasion softened due to the heat generated by the friction and, for example be deposited on the closing rollers, which affects the function of the rollers and increases the maintenance effort. Even with strip material that is coated with plastic, the friction and heating leads to undesirable damage to the Pipe surface and for fixing coating material to the guide and Forming surfaces, as well as on the closing rollers. To keep the abrasion and warming small to keep separating oils in the form of water-miscible cooling lubricants Mineral oil mixtures, emulsifiers and other additives are used. A commercial one Release agent is available under the Blasolube brand. To reduce friction, this release agent is used in abundance or bath-like, so that the resulting Pipe carries large quantities of release agent out of the molding device, which leads to contamination and / or increased cleaning effort.

If tape material that is coated with white plastic or polished Stainless steel is made up of guide and forming surfaces, at least in part are made of brass, is moved, the brass abrasion produces clearly visible blackened spots on the spiral duct. To clean these places would have to Rags and detergents operate at a disproportionate cost. However, if the dark spots remain on the pipe, they impair the appearance of the pipe, for example in ventilation pipes that are visible under the Ceiling are undesirable. In addition to the aesthetic impairment Damage to the plastic coating can also lead to the oxidation of the plastic layer of protected sheet metal. Even if the tape material is uncoated the abrasion can lead to an undesirable appearance and / or Lead to oxidation. Even on a stainless steel belt, the abrasion from the Oxidize the guide and forming surfaces on the spiral duct. Due to the friction between The two metal surfaces can have a surface gloss or a protective oxide layer of the tape material are impaired. Corresponding the aesthetic effect or the protection of the folded spiral-seam tube is reduced.

In addition to the problems that arise from abrasion, metal chips also result or other solid particles between the guide surfaces and the band material get faults or scratches in the surface of the spiral duct. In particular if a cutting disc is used as a cutting device, this occurs when cutting off a pipe section of metal chips. Even if the separator has no metal chips generated, the devices for producing spiral duct are often in Rooms in which metal chips are generated by other machines. Therefore should the scratching effect of such metal chips on the folded spiral-seam pipes was kept as small as possible become.

The invention is based on the object of a device for producing To find folded spiral-seam pipes, or a bending device for this, which is simply constructed and for pipes made of strip material that is coated or has a sensitive surface has reduced unwanted soiling and damage.

This object is solved by the features of claims 1 and 10, respectively. The dependent ones Claims describe preferred embodiments.

In the context of the present invention, it was recognized that the metal wear is decisive can be reduced if at least the forming surface and preferably also the guide surface comprises a plastic contact surface. This can be done using the forming surface and preferably also at least one guide surface with plastic coated or made of plastic. Are particularly advantageous band-shaped forming surfaces with a plastic contact surface because they are simple replaced and provided for all pipe diameters that may be required can be. For the storage of band-shaped forming surfaces or Forming tapes only take up a small space. The preferred form tapes comprise a metal band made of spring steel, which is coated with low-friction plastic is. If necessary, however, plastic forming tapes, in particular made of a mono or a composite plastic. The composite materials preferably comprise glass or carbon fibers.

When using plastic coatings must be between, preferably metallic, support part and the coating an extremely stable connection be achieved. This can be done using special adhesives that are particularly good on metallic Stick surfaces, be used and / or increase the adhesion before coating Surface treatments are carried out on the carrier part. At The appropriate surface treatments are preferably a roughening step carried out by grinding and / or sandblasting. The one for coatings Suitable plastics must interact with the surface of the strip material ensure small coefficients of friction. Such low-friction plastic coatings can from Poliamid, in particular Poliamid 11 (brand Rilsan), or polyethylene, in particular a PE ionomer (Abcite brand), or Chlorotrifluoroethylene (CTFE), in particular E-CTFE (Halar brand). It goes without saying that other low-friction coatings, in particular Teflon-like polytetrafluoroethylene (PTFE) or polyperfluoroethylene propylene (T. FEP) can be used.

The thickness of the plastic coating used is preferably in the range of 0.1-0.8mm and especially in the range of 0.2-0.4mm. With layer thicknesses in These areas can ensure that the coated contact surfaces achieve sufficiently long operating times until the coating has completely abraded. If necessary, worn forming surfaces are again made with plastic coated, which is particularly true when using coated tapes can be carried out with reasonable effort and with minimal material consumption leads. Because the metal abrasion from metal forming and guide surfaces especially for pipes that are coated or made of polished stainless steel, is disruptive, the use of the coated forming surfaces on this Pipes are limited. These specially sensitive tubes only make up approx. 5-10% the total production of a pipe manufacturer. Hence the effective usage time the coated forming surfaces or forming tapes are relatively small and this means that these coated forming tapes do not have to be replaced very often. When processing galvanized strip material, uncoated Forming surfaces are used because the zinc re-passivates at the injury points. In addition, there are scratches on galvanized material due to the trained on it Zinc flowers poorly visible.

With today's plastics and molding processes, the forming surface can and preferably also the guide surfaces are made entirely of plastic become. There are both one-component parts, in particular from those mentioned above low-friction plastics, as well as composite parts made of different Plastics possible. Composites are used to achieve a large one Tear resistance of forming surfaces at least one fiber material, especially glass or carbon fibers. The fiber material can be used as reinforcement, for example can be used in an extruded or cast plastic part. Possibly but becomes the fiber material for the production of a yarn and subsequently of a fabric used. The fabric can in turn be used as reinforcement be used in a plastic part. If necessary, the fabric with coated with a low-friction plastic or used directly as a forming surface. Plastic parts have a smaller size compared to coated metal parts Weight. If the forming surface of the bending device is not rigid, the lead Deformation movements when changing the forming surface for a plastic part less damage or breakage than metal parts coated with plastic. Therefore, forming tapes are essentially made of plastic only are advantageous.

If the forming surface and possibly also the guide surface is a contact surface made of plastic, so arises during the movement of the strip material no metallic abrasion along the contact surface. The possibly arising Plastic abrasion is not dark and does not cause oxidation. It also prevents that the surface of the tape material is damaged. When using Plastic contact surfaces also reduce the scratching effect of metal chips downsized because the metal chips can be absorbed in the plastic. Because of the better sliding properties of the plastic contact surfaces can also other lubricants are used. In particular, the lubricant, preferably in the form of a penetrating oil, applied in very small quantities so that neither the pipe nor the environment is exposed to the lubricant becomes noticeably dirty. A high-performance cutting oil is preferably used which comprises a mineral oil-hydrocarbon mixture and in particular an ester. The lubricant commercially available under the name Isolube is for Suitable for use.

The lubricant is not used like a bath, but preferably with one Application sponge applied to the surface of the strip material. The application takes place at least before the strip material is formed with the forming surface, but preferably before profiling the strip material. The Application device for applying the lubricant is preferably designed such that metal shavings are retained and not with the band material between this and an adjacent contact surface can reach. When a Lubricant is used that evaporates, so essentially remain on the pipe no Residues.

Fig. 1

eine perspektivische Darstellung einer Vorrichtung zum Herstellen von Wickelfalzrohren,

Fig. 2

eine perspektivische Darstellung einer Biegeeinrichtung zum Umformen des profilierten Bandmaterials mittels einer Umformfläche in eine schraubenlinienförmige Teilfläche eines Zylindermantels und

Fig. 3

zwei schematische Schnitte einer Rohrwandung in Richtung der Rohrachse

The drawings explain the invention using an exemplary embodiment. It shows

Fig. 1

1 shows a perspective illustration of a device for producing spiral-seam pipes,

Fig. 2

a perspective view of a bending device for reshaping the profiled strip material by means of a reshaping surface in a helical partial surface of a cylinder jacket and

Fig. 3

two schematic sections of a pipe wall in the direction of the pipe axis

Fig. 1 shows a device (1) for producing folded spiral tubes (2) from strip material (3). The device (1) comprises a profiling device (4) for forming of folding wheels on the strip material. For this purpose, the profiling device (4) comprises, for example at least three, but preferably four, not shown profiling roller pairs. For forming folding wheels, especially on one side of the strip material Single board and a double board on the other side of the strip material are preferred three pairs of profiling rollers used. If necessary, a pair of profiling rollers formed to form at least one reinforcing bead. Reinforcing beads are particularly thin strip materials and / or large ones Appropriate pipe diameters. To make reinforcing beads easy To make it selectable is preferably a role of the pair of profiling rollers Forming reinforcing beads, can be removed or inserted with little effort. In order to unroll the strip material 3 from a unwind device 5, at least one Profiling roller pair, but preferably all profiling roller pairs, from one Drive, not shown, driven. To feed the tape material easily To be able to, a pair of profiling rollers is preferably used to form folded edges arranged as a pair of rolls first run through by the strip material. From the profiling device 4 the profiled strip material 3 passes through a guide arrangement 6 at least one guide surface in a bending device for forming the Band material 3 by means of a forming surface 7 in a helical Partial surface of a cylinder jacket.

According to US Pat. No. 4,567,742, a special one is used to advance the strip material Drive roller pair used with knurled or knurled rollers. These roles lead to damage to the surface of the strip material. By now at a preferred embodiment of the invention, the profiling rollers driven a separate pair of drive rollers can be dispensed with, which means that the additional damage is avoided. To also with the smooth profiling rollers To achieve the necessary thrust, all four pairs of profiling rollers are preferred driven. If necessary, the profiling rollers are also coated with plastic, so that when the strip material moves through the pairs of profiling rollers no metallic abrasion can occur.

In the illustrated embodiment, the forming surface 7 is from the inside of a plastic-coated forming tape 8 is formed. The tape material arrives from the guide arrangement 6 to the inside of the forming belt 8, on which it moves along due to the continuous feed and is thereby curved. In order to keep the flexible forming belt 8 in the desired shape, there is a support device 9 provided that the forming tape at least on two, but preferably on supports three points against external deformation. These are shown in the Embodiment three guide profiles 10 provided, the narrowest Guide the ribbon area in different radial directions. For example one guide profile leads vertically upwards and two others are on both sides of it an angle of essentially 45 ° rotated. On the management profiles 10 are support elements 11 corresponding to the desired pipe diameter and can be fixed on the appropriate ribbon.

After a curvature of the strip material 3 by 360 °, the striking one another Folded edges of the two sides of the tape material inserted into each other and closed by a folding closing device 12 shown in FIG. 2. To the The interlocking fold edges are closed with interacting Pressing surfaces 13a pressed together by two closing rollers 13. To hold 1 of the resulting folded spiral-seam tube 2 is a support device 14 rotatable support rollers 14a is provided along an exit axis. If that Spiral folding tube 2 has the desired length, so it will be close to the seam closing device 12 from a cutting device 15, which is preferably a cutting disc 15a and includes a drive motor 15b. It goes without saying that instead of the cutting disc 15a also a roller shear or a thermal cutting device, such as a plasma or laser cutter can be.

The rolling device 5, the profiling device 4, the guide arrangement 6 and the Forming surface 7 are along a pivotable relative to the exit axis a feed axis extending, carrier 16 arranged so that the angle between the feed axis and the exit axis to the respective pipe diameter can be customized.

The band material that can be used consists at least partially of metal, in particular Sheet metal or steel, a surface protection by a zinc layer, an oxide layer, a plastic coating, or through the use of stainless Metal, especially stainless steel is achieved. A bleaching is commonly used a width of 137mm and a thickness corresponding to the one to be produced Pipe diameter is between 0.5 and 1mm.

Fig. 2 shows a section of the guide assembly 6, as well as the ribbon 8 and the Locking device 12. The guide arrangement 6 comprises a on a support plate 6c first guide surface 6a, which is composed of partial surfaces, with between the partial areas extend in the tape feed direction. In these recesses can the optionally formed reinforcing beads of the band material be included. To keep the tape material on the guide surface 6a above this first guide surface 6a at a distance from the strip material required Thickness a further guide surface 6a, not shown, is provided, so that the Tape material is inserted into the forming tape, resting against the first guide surface can be. Because now at least the surface of the first one and especially the one second guide surface 6a, but preferably the entire rod elements between the first guide surface 6a and the support plate 6c, consist of low-friction plastic, can arise when moving the strip material over the guide surface can be prevented by metal abrasion. Because the tape material comes out right after it exits the cooperating guide surfaces curved on the forming surface 7 of the forming belt very large frictional forces occur. Because of these large frictional forces were no materials other than metal according to the prior art used. This limitation to metallic guiding and forming surfaces is also with to explain the prejudice that due to the high forces and intensive rubbing only metals can be used. The abrasion was only great Reduced amounts of lubricant. Surprisingly, it has now been shown that the low-friction plastics mentioned above can withstand the high loads.

Lateral borders 6b are formed on both sides of the first guide surface 6a which the lateral fold edges of the strip material 3 are guided. There is a sideline of the forming belt 8 is arranged as an extension of the side edge 6b and therefore serves as a lateral guideline for a folded edge when the Tape material. After a curvature of 360 °, this side guide line of the Formband 8 the associated folding edge to the other folding edge, the other lateral edges 6b of the first guide surface 6a is guided. Shortly before the seam locking device 12 one folding edge is inserted into the other, the Forming tape shortly before the insertion area has a recess 8a which is unobstructed Insertion of the two folded edges guaranteed. In addition is the folding closing device 12 is also arranged in the region of the recess 8a.

A bracket 13b for holding a closing roller 13 is fastened to the support plate 6c, the bracket through the forming tape 8 against the tube produced extends. The other closing roller 13 is also rotatably attached to the support plate 6c. In order to enable a simple and precise fastening of the forming band 8, 8 terminal blocks 8b are attached to both ends of the forming band Fastening points with the support plate 6c, or a fastening part arranged thereon 6d are connectable. The connection is preferably made with two Screws, but any other connections are also conceivable. Possibly the forming tape 8 is attached to a connecting block 8b in a somewhat adjustable manner, so that the effective length of the forming belt 8 is somewhat adjustable.

By using forming and preferably also guide surfaces In addition to the metallic abrasion, plastic could also scratch the outer surface of the pipe can be reduced by metal chips. The chips are sometimes so deep in the Plastic pressed in so that they no longer produce any visible scratch marks. The The risk of scratching is also reduced by choosing a relatively small mold bandwidth of essentially 25mm. The preferred form strips comprise a spring steel strip which is coated with plastic. The thickness of the spring steel strip is in Range of 1-2mm, preferably at 1.5mm. The thickness of the plastic coating used is preferably in the range of 0.1-0.8mm and in particular in Range from 0.2-0.4mm. The ribbon length is based on the diameter or the circumference adapted to the pipe to be manufactured.

Optionally, however, are shaped tapes made of plastic, especially one Mono or a composite plastic used. The composites include preferably glass or carbon fibers and also ensure in the form of Bands high strength.

Fig. 3 shows two schematic sections of a pipe wall in the direction the tube axis, how the two fold edges 3a and 3b insert into each other and then close to a closed fold 3c.

Claims (10)

Device for producing folded spiral-seam tubes from band material (3), which consists at least partially of metal, with a profiling device (4) for forming fold edges (3a, 3b) on the band material (3), at least one guide surface (6a) for continuing the with fold edges (3a, 3b) provided band material (3), a bending device for reshaping the band material (3) by means of a reshaping surface (7) into a helical partial surface of a cylinder jacket, a fold-closing device (12) for closing pressing together of the folded edges (3a, 3b) introduced into one another and a separating device (15) for separating manufactured pipe sections, characterized in that the forming surface (7), and preferably also the at least one guide surface (6a), comprises a plastic contact surface. Apparatus according to claim 1, characterized in that the plastic of the Contact surface is low-friction and preferably polyamide, in particular Poliamid 11, and / or polyethylene, in particular a polyethylene ionomer, and / or chlorotrifluoroethylene, in particular E-CTFE, and / or polytetrafluoroethylene (PTFE) and / or polyperfluoroethylene propylene (T. FEP). Device according to claim 1 or 2, characterized in that the contact surface made of plastic as a coating on a metallic part, preferably on a band of hardened spring steel, adheres. Device according to claim 1 or 2, characterized in that the forming surface (7) on a plastic part, in particular on a plastic band, and preferably at least one guide surface (6a) is also formed as a plastic part is. Device according to one of claims 1 to 4, characterized in that the Forming surface (7) is formed by a flexible forming strip (8) which is attached to the bending device is attached interchangeably, the bending device preferably a support device (9) with which the forming tape (8) at least comprises at two, but preferably at three points against external deformations is supported. Device according to one of claims 1 to 5, characterized in that the Profiling device (4) at least three, but preferably four, pairs of profiling rollers comprises, three of which are used to form folding wheels (3a, 3b), in particular a single shelf on one side of the hinge and on the other side of the hinge a double board, and possibly a pair of profiling rollers to form at least one reinforcing bead are formed. Apparatus according to claim 6, characterized in that all pairs of profiling rollers are drivable and / or that a pair of profiling rollers to form Folded edges arranged as a pair of profiling rollers that the strip material first passed through is. Device according to one of claims 1 to 7, characterized in that for Holding the resulting folded spiral tube along a support device (14) an exit axis, preferably with rotatable support rollers (14a) is. Apparatus according to claim 8, characterized in that a rolling device (5) for the strip material (3), the profiling device (4), the at least one guide surface (6a) and the forming surface (7) on one relative to the exit axis pivotable carrier (16) arranged along a feed axis are so that the angle between the feed axis and the exit axis can be adapted to the respective pipe diameter. Bending device for a device for producing folded spiral-seam tubes from band material (3), for shaping the profiled band material (3) by means of a shaping surface (7) into a helical partial surface of a cylinder jacket, characterized in that the shaping surface (7) of the bending device consists of a flexible shaping band (8) is formed with a plastic contact surface to the band material (3), the forming band (8) being attachable in the region of a guide surface (6a) for the continuation of the band material (3, 3b) provided with fold edges (3a, 3b) and preferably made of a plastic-coated spring steel strip, if necessary, consists entirely of a mono- or composite plastic.

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