WO1995010371A1

WO1995010371A1 - Plate roll

Info

Publication number: WO1995010371A1
Application number: PCT/DK1994/000379
Authority: WO
Inventors: Jens Peis
Original assignee: Jens Peis Maskinfabrik A/S
Priority date: 1993-10-08
Filing date: 1994-10-10
Publication date: 1995-04-20
Also published as: DK113093D0; AU7807994A

Abstract

A plate roll comprising two stationary lower rolls (2) situated next to one another and being rotary arranged and above and between these is situated an upper roll (4) which can be displaced towards and away from the lower rolls. The plate roll has a pre-bending tool in the form of two pre-bending beams. The roll is constructed about two gables of individual heavy steel plates and in which a heavy lower bar (6) is arranged. The pre-bending beam (8) is detachably hinged on the upper edge of the lower bar and can be lifted off by a lifting unit (16) which simultaneously can tilt the pre-bending beam to abutment with one or the other lower roll. As the construction offers a clear picture of the forces, the construction can be optimized and the lower frame may be avoided, this frame previously being a necessary power absorbing feature; at the same time the lower bar yields a significant contribution to the strength resource of the pre-bending beam. Special embodiments of the roll can also be used as a bending machine, profile roll as well as rolling or bending of truncated cones.

Description

Plate roll

There is known a plate roll comprising two stationary lower rolls situated next to one another and being rotary arranged and above and between these is situated a top roll which can be displaced towards and away from the lower rolls and a pre-bending tool in the form of a stationary pre-bending beam, the upper edge of the former going up between the lower rolls, can be brought into the advance path of the plate members simultaneously being tilted towards the sides of one or the other lower roll, respectively.

There is known a plate roll of this type, the roll having a lower bar which in its arrested position takes up a vertical position the plate being retained at its lower edge by two sets blocks at the gables. At pre- -bending of plate members the pre-bending beam is lifted up onto the blocks at one side and is tilted towards the side of the opposite lower roll. In order to absorb the extreme forces being present during the pre-bending process it is necessary to construct the plate roll on a sturdy base frame and the gables in like manner are vigorously dimensioned having double walled gables.

The object of the invention is to define a simpli¬ fied construction of the type of plate rolls discussed. This is achieved according to the invention by providing the plate roll with a lower bar which by its ends is arranged in recesses in gables that are constituted of individual heavy steel plates and arranged such that the pre-bending beam from an arrested position can be lifted up onto the upper edge of the lower bar between the two lower rolls and tilted to abutment against the sides of one or the other lower roll. The design entails a considerable simplification of the construction at the same time providing a more obvious picture of the forces being present in the construction and thereby rendering the base for an optimizing of the construction.

The pre-bending beam is preferably detachably hinged on the upper edge of the lower bar and can be lifted off to its arrested position. The hinging can be made by rounding the lower edge of the pre-bending beam and let it rest in a groove of a corresponding cross section as that of the upper edge of the bar whereby a smooth transfer of the forces is achieved. Instead of the rounding of the of the lower edge of the upper bar a length of round bar steel (possibly divided into several lengths) and alternatively provide a groove of a cor¬ responding cross section in the lower edge of the pre- -bending beam causing this to rest on the round bar steel. This causes the obvious advantage that a length of round bar steel of a suitable tempering may be used.

Similarly a length of round bar steel (possibly divided into several lengths) can be arranged in the upper edge of the pre-bending beam, the bar possessing optimum material properties and in like manner the round bar steel can be curved for compensation of the deflec¬ tion of the upper roll during the pre-bending process.

A further development of the pre-bending beam can be provided with two pre-bending beams which extends the range of application of the machine; it thus facilitates rolling of cones and truncated cones without further ado. The unfolded blank has a guide rod welded on at its upper end and is rotated step by step about a point cor¬ responding to the summit of the cone, each time a bend¬ ing is being performed. In theory the two pre-bending beams might stand next to one another on the lower bar but an embodiment is preferred where the two plates have opposite toothings at their lower sides fitting into one another such that the plates are on a mutual line. Both pre-bending beams might be provided with a lifting and tilting means but it is preferred to have one loose beam that is lifted into the machine from above between the two lower rolls.

Cones of small differences between their base and top radii can alternatively be rolled by stopping the unfolded blank at its summit by means of a guide roll placed at the outer side of the lower rolls.

By further development of the roll this can also be used as a bending machine. In one embodiment a bracket is mounted in the end of the plate roll on which bracket bending tools can be mounted cooperating with tools on the protruding end of the upper roll. In another embodi¬ ment the upper roll at its lower side is provided with a bending rail that can cooperate with edge bending tools on the bar. Narrow members can be bent at the end of the roll while wider members must be bent between the rolls.

Furthermore, the roll can be used for section roll¬ ing by the ends of the roll being mounted with profile rolls, standard ones as well as especially designed ones.

The invention shall be described in further details in the following with reference to the accompanying drawing in which:-

Fig. 1 shows a schematic cross section through an embodiment of the plate roll according to the invention,

Fig. 2 illustrates a section of a further develop¬ ment with two pre-bending beams,

Fig. 3 is a perspective view of the two pre-bending beams,

Fig. 4 is a direct frontal view of another embodi¬ ment of the plate roll according to the invention.

Fig. 5 shows a special bearing construction of the upper roll,

Fig. 6 shows purely schematically the bending of a cone, the two lower rolls and the unfolded plate member being viewed from above, Fig. 7 shows purely schematically rolling of a cone, the two lower rolls being viewed from above with the unfolded plate member being laid out over these,

Fig. 8 shows purely schematically the end of the plate roll mounted with a bracket and provided with bending tools,

Fig. 9 shows the same as Fig. 8 but provided with another bending tool.

Fig. 10 shows a schematic cross section in the roll where the upper roll is provided with a bending rail.

Fig. 11 shows the same as Fig. 10, but with a pre- -bending beam provided with edge bending tools, and

Figs. 12-14 show protruding ends of the rolls pro¬ vided with section rolling rolls, where Figs. 12 and 13 illustrate standard rolls, whereas Fig. 14 illustrates special rolls.

As illustrated the plate roll comprises two adjacent lower rolls 2 being rotatably arranged in gables which contrary to prior art plate rolls are con¬ stituted of a single steel plate. The two gables are identical and can be cut in one cutting operation, the same applies to the necessary holes for axle journals and such like which can be drilled in both plates during one drilling operation. This causes a major simplifica¬ tion in the production. Above and in the mirror plane between the two lower rolls a rotatable upper roll 4 is arranged, this being displaceable down towards and away from the lower rolls. In the mirror plane between the two lower rolls and below these is found a lower bar 6 the ends of which are inserted into corresponding recesses in the gables. The lower edge of the bar which is arranged in the gables is rounded off to allow an even transfer of the forces that are present in the construction.

On the upper edge of the bar extending between the gables a pre-bending beam 8 is detachably knuckle jointed. The hinging is brought about by arranging a length of round bar steel 10 of a suitable alloy and tempering in a groove in the upper edge of the bar having a corresponding cross section of an arc of a circle. The pre-bending beam 8 rests on the round bar steel, the lower edge of the pre-bending beam likewise having a longitudinal groove of a cross section of an arc of a circle corresponding to that of the round bar steel. The depth^' of the groove and the chamfering of the side edges have been matched such that the pre-bending beam can swing unobstructedly to abutment against the sides of one or the other lower roll. Standing on top of the lower bar the pre-bending beam goes up between the two lower rolls and extends into the advance path of the plate member 12. In a groove in the upper edge of the pre-bending beam a steel bar 14 of a suitable alloy and tempering is arranged such that it is more capable of resisting the effects that it is exposed to during _:he pre-bending process than may be achieved by a rounding of the upper edge of the pre-bending beam.

In the drawing the plate roll is shown when per¬ forming a pre-bending process where a plate member 12 that is to be rolled to a cylindrical enclosure has been inserted into the machine with the front edge resting against the upper edge of the pre-bending beam, i.e. the round bar steel 14 and with the upper roll 4 in a down¬ ward movement for bending the edge of the plate. At pre-bending the rear edge of the plate member the pre- -bending beam 8 is tilted towards the other lower roll shown to the left in the figure.

For lifting off the pre-bending beam 8 from the lower bar 6 and to tilt this towards one or the other lower roll respectively there are a jack cylinder 16 and a tilting cylinder 18, respectively, at either end of the pre-bending beam. The tilting cylinder 18 is fastened to the constructive structure of the plate roll with one end and the other end connected to the jack cylinder 16. By activating the tilting cylinder 18 the jack cylinder is actuated to alternate sides, whereby the pre-bending beam is tilted to abutment against one or the other lower roll. For lifting off the pre-bending beam the jack cylinder 16 is activated causing the pre- -bending beam to be lifted and with its lower edge swings out to a position at the side of the lower bar 6 and by a lowering enters its arrested position where the pre-bending beam stands next to the lower bar and does not protrude into the advance path of the plate members.

The lifting device, however, is not essential to the invention as a lifting off of the pre-bending beam can be achieved in a variety of ways.

In Figs. 2 and 3 of the drawing a further develop¬ ment of the plate roll is shown which can be provided with two pre-bending beams 8a, 8b where one 8a is inte¬ grated and has a lifting and tilting device. The other plate is an additional loose beam which by means of a crane can be lifted into the machine down between the two lower rolls. The lower edges of the plates are pro¬ vided with a toothing 20a, 20b that fits into one another such that both plates are on the same length of round bar steel 10. As mentioned in the opening clause this adds considerably to the applications of the plate roll.

A particular simple construction of the roll is shown in Fig. 4 of the drawing - like before the roll comprises two lower rolls 2 and an upper roll 4 arranged between two gables 22. A table 24 is arranged in connec¬ tion with the lower rolls. The upper roll 4 is placed in a revolvable bearing frame 26 by one end. The revolving arrangement comprises a longitudinal bar 28 connected between two arms 30 and 32. The arrangement is operated by a hydraulic cylinder 34 connected to the right arm 32. The movement is transferred via the bar 28 and the arm 30 to the bearing frame 26. The arrangement performs the initial revolving/final revolving, respectively, of the bearing frame 26. The bearing 36 has a special con¬ struction as it consists of a ball seated in a cone that adapts itself to the revolving movements of the bearing frame and that catches the end of the roll. Furthermore the end of the arm 30 is placed in a slide block 38 in the end of the bar 28. The movement of the slide block in the recess can be adjusted by an adjusting screw 40. When the bearing frame is disconnected from the plate roll the revolving movement is taken over by a hydraulic cylinder 42, floatingly attached to the construction. To this the cylinder has a retreating bar 44 which passes freely through a crossbar 46 in the construction. The cylinder is prevented from disengagement by a stop 48 at the end of the bar onto which a series of disc springs 50 are inserted between the cylinder housing and the crossbar. Due to the special bearing construction a'nd the revolving arrangement the upper roll 4 can be ob¬ liquely positioned by the arrangement lowering the left end of the roll. The declination is adjusted by the mandrel 52 acting as a stop to the arm 32. Instead of a crank handle the mandrel can be operated by an electric motor and by e.g. a tachometer a measure of the declina¬ tion of the roll can be obtained. For determination of the advancement of the blank the roll is provided with a simple mechanical counter 54 driven by a gear at the lower roll at the feeding side. Obviously the roll may be provided with advanced electronic equipment if so required.

Figs. 6 and 7 of the drawing illustrate two dif¬ ferent ways of how to manufacture a cone with the roll. Cones having their large and small diameters extremely different can be manufactured using the two pre-bending beams 8a, 8b as described above. An unfolded plate member 52 is welded on to a guide bar 58 at the top end at one side as shown in Fig. 4. The outer end of the bar is pivotally fixed about a vertical pivot. The two pre- -bending beams 8a, 8b are declined outwardly towards the lower rolls such that they constitute a V-shaped track up into which the cone is bent. This takes place without deformation of the edge of the plate at the small dia¬ meter of the cone and without friction which would otherwise detrimentally effect the rolls and the plate member.

Cones or rather truncated cones having a minor dif¬ ference between the small and the large diameter can be rolled by placing a guide roll 60 at the outer side of the lower rolls 2. At rolling the guide rolls slow down the upper edge of the plate member. The upper roll 4 is placed obliquely and the pre-bending beams 8a, 8b are placed in an arrested position. The cone is rolled up by repeated runs typically three to five times.

By providing the plate roll with a bracket 62 'being arranged on protruding ends 64 on the lower rolls, this can be utilized as a bending apparatus for slim members. The bracket 62 further rests on two ribs 66 protruding from the gable of the plate roll to relieve the ends of the lower rolls. At the bracket various bending tools 68; 70, can be arranged and the protruding end 72 of the upper roll can be mounted with cooperating tools 74, 76. In Fig. 8 of the drawing a bending of a bar or a pipe is shown while Fig. 9 illustrates bending of a frame.

Wider items can be bent between the rolls as shown in Figs. 10 and 11 where the upper roll 4 at its lower side is mounted with a bending rail 78. The bending can be performed directly between the two lower rolls as shown in Fig. 10 or by an upper bar 80 having inter¬ changeable edge bending tools 82 as illustrated in Fig. 11. The differences between Figs. 9 and 11 are that the member in Fig. 9 is narrowly limited to the protruding ends of the rolls whereas the member in Fig. 11 may extend the entire length of the plate roll.

Furthermore, the plate roll can be used for section rolling by providing the protruding roll ends 64, 72 with section rolling rolls 84, 86 as shown in Figs. 12-14, where Figs. 12 and 13 illustrate standard section rolling rolls and Fig. 14 special section rolling rolls. In Fig. 12 is shown rolling of a bar having a rect¬ angular cross section, and in Fig. 13 is shown rolling of a T-section, whereas Fig. 14 shows rolling of a pipe.

As will be evident the invention provides a plate roll of an uncomplicated construction having obvious production advantages and where the pre-bending beam due to the lower bar achieves an exceptionally high degree of robustness and strength.

Claims

C L A I M S :

1. A plate roll comprising two stationary lower rolls (2) situated next to one another and being rotary arranged and above and between these is situated an upper roll (4) which can be displaced towards and away from the lower rolls and a pre-bending tool in the form of a standing pre-bending beam (8) the upper edge fitting between the lower rolls can be brought into the advance path of the plate members (12) simultaneously being tilted towards the sides of one or the other lower roll, respectively, characterized in that the plate roll has a lower bar (6) , by the ends being embedded in recesses in gables constituted of individual heavy steel plates and arranged such that the pre-bending beam (8) from an arrested position can be lifted up between the two lower rolls and up onto the upper edge of the lower bar and there can be tilted to abutment against the sides of one or the other lower roll.

2. A plate roll according to claim 1, characterized in that the pre-bending beam (8) is detachably hinged on the upper edge of the lower bar over a length of round bar steel (10) or other suitable profile embedded in corresponding grooves in the upper edge of the lower bar and the lower edge of the pre-bending beam.

3. A plate roll according to claim 1, characterized in that a length of round bar steel (14) or other suit¬ able section is embedded in the upper edge of the pre- -bending beam.

4. A plate roll according to claim 3, characterized in that the round bar steel in the upper edge of the pre-bending beam is arched.

5. A plate roll according to claim 1, characterized in that it comprises two pre-bending beams (8a, 8b) .

6. A plate roll according to claim 5, characterized in that the lower edges of the pre-bending beams have corresponding toothings (20a, 20b) , fitting between one another.

7. A plate roll according to claims 2 and 6, char¬ acterized in that the two pre-bending beams rest on a mutual round bar steel.

8. A plate roll according to claim 1, characterized in that it can be mounted with a guide roll (60) at the outer sides of the lower rolls (2) for rolling truncated cones.

9. A plate roll according to claim l, characterized in that at least at one end the roller shafts (64, 72) protrude from the end of the plate roll, and designed for direct or indirect mounting of tools such as bending tools and section rolling rolls.

10. A plate roll according to claim 1, character¬ ized in that the upper roll (4) can be provided with a bending guide (78) at the lower side that can cooperate with edge bending tools (80, 82) on the lower bar (6).