EP1197272A2 - Bending machine with two rolls and method of round bending plates - Google Patents

Abstract

Two roller rounding machine comprises an elastic guide roller (3, 5) and a rigid rounding roller (6). The rounding roller is impinged upon by at least one further elastic roller (8, 10, 11, 13). An Independent claim is also included for a method for rounding sheets to form tubular bodies using the two roller rounding machine by passing a sheet (20) at least twice between the guide roller and the rounding roller. Preferred Features: The further elastic roller is impinged upon by a rigid support roller (14).

Description

The invention relates to a two-roll round machine according to the preamble of claim 1 and a Process for rounding sheets according to the preamble of Claim 9.

Two-roll round machines are known. at This is the sheet to be rounded between a round roller made of metal and a guide roller with pressure elastic Plastic coating, e.g. Neoprene®, passed, with the rollers pressed against each other be so that in the pressure-elastic coating forms an indented area in which a deformation of the sheet around the round roller.

In the case of circular machines, one should generally be as possible good rounding of the leading and trailing edge area of the sheet, even with small ones Diameters of the rounded sheet metal pipes of e.g. 30-80 mm. In three-roll round machines, e.g. according to EP-A-0 368 686 or EP-A-0 096 643 the distance of the both work roles kept as low as possible. For two-roll round machines results from the plastic coating the guide roller is only a small one Flat zone formation, but this is also an improvement desirable, especially with a very small diameter the round roller in the range from 30 to 80 mm.

The invention is therefore based on the object an improved two-roll rounding machine create.

This task is performed on the two-roll round machine of the type mentioned above by the characteristic Features of claim 1 solved.

The fact that another roller with pressure elastic Coating (hereinafter, simplified pressure-elastic Called roller) is provided, another Rounding takes place, which improves the rounding success. Furthermore, this additional roller stabilizes the Round roller against deflection of the same, which is particularly the case with small diameter of the round roller is desired.

Preferably two of these are others provided pressure-elastic rollers, which in particular a Good rounding with a round roller stabilized against deflection results.

It is further preferred if one or more Back-up rollers are provided, which in turn are the support pressure-elastic rollers, the support rollers in usually no rollers with pressure-elastic coating are (and are therefore referred to as rigid rollers can).

It is further preferred if at least one Guide device is provided, which from the first Pair of rollers (guide roller, round roller) emerging sheet metal leads to the second pair of rollers (round roller, further roller).

The invention is also based on the object to create a rounding process, which the above Does not have disadvantages.

This is the case with the method mentioned at the beginning achieved with the characterizing features of claim 9.

It has been shown that by two Passing a sheet through the inventive Round machine gives a particularly good rounding.

Figur 1 schematisch eine Zweiwalzen-Rundmaschine in einer ersten Position;

Figur 2 die Rundmaschine von Figur 1 in einer zweiten Position;

Figur 3 ein weiteres Ausführungsbeispiel einer Rundmaschine gemäss der Erfindung;

Figur 4 ein Ausführungsbeispiel mit einer Leiteinrichtung; und

Figur 5 ein weiteres Ausführungsbeispiel.

Exemplary embodiments of the invention are explained in more detail below with reference to the drawings. It shows:

Figure 1 shows schematically a two-roll round machine in a first position;

Figure 2 shows the circular machine of Figure 1 in a second position;

Figure 3 shows another embodiment of a round machine according to the invention;

Figure 4 shows an embodiment with a guide device; and

Figure 5 shows another embodiment.

Figure 1 shows a first schematic Embodiment of a two-roll round machine 1. This Machine has a machine frame shown only as box 2 on which the axes of the rollers and Rollers of the machine are stored, the schematic Representation of the axes perpendicular to the plane of the drawing shows. In or on the machine frame is also only a Box 17 shown drive for the driven Rollers and an electronic control 16 provided which controls the drive. In Figure 1 is the guide roller 3 of the round machine with its elastic under pressure deformable coating 5 shown. This coating is a known plastic coating on such machines and will not be explained here. by virtue of this coating is followed by the roller 3 referred to as a pressure-elastic guide roller. The roller is rotatably mounted about its axis 4 in the machine frame 2. With 6 the round roller of the round machine is designated, this roller does not have a pressure-elastic coating carries and therefore referred to below as a rigid roller becomes. Figure 1 shows this roller spaced from the guide roller 3, so that the sheet 20 to be rounded can be inserted between the rollers.

Figure 2, wherein the same reference numerals as in Fig. 1 denote the same elements, shows the actual Round position, in which the round roller 6 against the guide roller 3 is pressed, so that the round roller 6 a Deepening in the pressure-elastic coating 5 of the Guide roller creates which presses the to be rounded Sheets on the round roller. By means of the two called rollers 3 and 6, the sheet is on conventional Way rounded by the round roller 6 by the drive 17 is driven, which in Fig. 2 with arrows shown rotational movement of the rollers, and causes that the sheet 20 is drawn between the rollers 3 and 6 and is rounded around the roller 6.

According to that shown in Figures 1 and 2 Embodiment of the invention are now two more pressure-elastic rolls, also rolls with a plastic coating, which the Apply pressure-rigid round roller 6. In the shown Examples are these two rollers 8 and 11 with their coatings 10 and 13 and the axes of rotation 9 and 12, which parallel to the axes of rotation 4 and 7 of the rollers 3 and 5 run laterally in the direction away from the guide roller 3 Area of the round roller 6 arranged. The rollers 8 and 11 are arranged symmetrically to the plane E, which is spanned by axes 4 and 7. The pressure elastic Rollers 8 and 11 each cause a new one Rounding the sheet 20 around the rigid roller 6. On the other hand, these rollers support the Round roller 6, which is particularly low in the case of round rollers 6 Diameter, especially in the diameter range of 30 - 80 mm, is advantageous.

The sheet 20, which after the first rounding between the guide roller 3 and the round roller 6 itself the latter can replace the one shown Configuration more or less blunt on the roller 8, or their coating 10 hit. This can be an undesirable one Result in rounding or kinking of the sheet, which, however, follows when the sheet between the Rolls 8 and 6 passes and also between Rollers 11 and 6, through the appropriate forming again will be annulled. A particularly good rounding results when the sheet 20 passes twice through the rollers mentioned runs through, i.e. after the first rounding process by means of the roller pairs 3 and 6, or 8 and 6 and 11 and 6 passed through the rollers 3 and 6 again and then again through the rollers 10 and 6 and 11 and 6. In this way, unrounded or improperly rounded sections safely avoided. The Control 16 of the machine is designed accordingly, to cause each sheet to go through twice.

To remove the rounded sheet 20 is the round roller 6 is in turn spaced from the guide roller 3, as shown in Figure 1, and further also the rollers 8 and 11 spaced from the round roller 6, around the rounded plate perpendicular to the plane of the drawing can be removed from the round machine. The Movement of the rollers 8 and 11 can be translational Movement down in the drawing, or one Pivotal movement of the axes of rotation 9 and 12 about a pivot axis each outwards so that the rollers 8 and 11 release the round roller 6. For the next rounding operation the rollers 8 and 11 are then in the Figures 1 and 2 position shown spent.

Instead of continuous rollers 8 and 11 these can also be spaced apart by a series of coaxial ones rollers arranged to each other.

A backup roller is also preferred 14 provided, which in turn the pressure-elastic rollers 8 and 11 supports. The backup roller 14 is shown in FIG Example is rotatable about an axis of rotation 5 and is a pressure-rigid support roller, so it has no elastic Coating on.

FIG. 3 shows a further exemplary embodiment, the same reference numerals as used until now, designate the same elements. This is also done here the rounding of the sheet 20 between the pressure-elastic Guide roller 4 and the rigid roller 6. Below the same is now only a pressure-elastic roller 21 provided with their coating 23, which is about an axis 22 is arranged rotatably. Again, it can be natural are about multiple roles that together make up the roller form. Below this roller there is again a rigid pressure Support roller 24 mounted with its axis of rotation 25, which forms a support for the roller 21. This Roller 21 is used in the manner already described Rounding the sheet and supporting the round roller 6.

FIG. 4 shows a further exemplary embodiment, the same reference numerals the same elements describe. Here again is an execution shown with two pressure-elastic rollers 8 and 11, a guide device 30 is also shown here, which is the rounded one emerging between rollers 3 and 6 Receives and guides sheet metal with its guide surface 31, such that the rounded sheet is in a suitable position is inserted between the rollers 8 and 6. Through the Guide device 30 can surely emerge or buckling of the sheet 20 when it first comes into contact with the roller 8 can be prevented. In this case, in usually a single run through the sheet the roller pairs 3 and 6, or 8 and 6 and 11 and 6.

FIG. 5 shows a further exemplary embodiment, in which again the same reference numerals are the same Label elements. This embodiment differs differs from that of FIGS. 1 and 2 or 4, in that, in addition to the rollers 8 and 13 common Back-up roller 14 also has its own back-up roller 32 for the roller 8 and 33 for the roller 11, respectively is. The rollers 32 and 33 are each around Axes 34 or 35, rotatable. For this example too of course, the described insertion and unloading process applies as well as the corresponding drive and control and the construction of individual rolls from different coaxial Roles, as has already been described.

Claims (9)

Two-roll round machine with a pressure-elastic guide roller (3, 5) and a pressure-rigid round roller (6), characterized in that the round roller can be acted upon by at least one further pressure-elastic roller (8, 10; 11, 13; 21, 23). Two-roll round machine according to claim 1, characterized in that the further pressure-elastic roll (8, 10; 11, 13; 21, 23) is acted upon by a pressure-rigid support roll (14, 32, 33). Two-roll round machine according to claim 1 or 2, characterized in that two pressure-elastic further rolls (8, 10; 11, 13) are provided which on both sides of the plane (E) through the axes (4, 7) of the guide roll (3, 5 ) and round roller (6). Two-roll round machine according to claim 3, characterized in that the two pressure-elastic rolls (8, 10; 11, 13) are acted upon by a common pressure-rigid support roll (14). Two-roller round machine according to claim 3 or 4, characterized in that the two pressure-elastic rollers (8, 10; 11, 13) are each acted upon by their own pressure-rigid support roller (32, 33). Two-roll round machine according to one of claims 1 to 5, characterized in that a guide device (30, 31) is provided, which is designed to feed the rounded sheet between the round roll (6) and the further roll (8). Two-roll round machine according to one of claims 1 to 6, characterized in that it comprises a control device (17) which controls the drive (16) of the driven rolls, and is configured such that a sheet (20) to be rounded is at least twice Pass through the guide and the round roller can be brought. Two-roll round machine according to one of claims 1 to 7, characterized in that the round roll (6) has a diameter of 30 to 80 mm. Method for rounding sheets to tubular bodies by means of a two-roll rounding machine according to one of Claims 1 to 7, characterized in that the sheet (20) to be rounded is passed at least twice between the guide roll (3, 5) and the round roll (6).

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