RU2036739C1 - Two-roll sheet bending device - Google Patents

Abstract

FIELD: mechanical working of metals. SUBSTANCE: machine has rigid mandrel roll 3 and driven forming roll 2 with elastic coat mounted in a bed 1. An open slot extended along the roll generatrix is filled with insertion 5 of flexible material. Two pairs of supports 9 and 10 control insertion. Two-position supports 10 get turned to 180 degrees during manufacturing pipe pieces with circle length less than length of cross arc of forming roll 2. In this case rollers 8 mounted on shafts get on supports 10 steps 11 and insertion 5 does not drop into the slot 4. This provides pipe pieces shaping of mentioned diameters within one revolution of a roll. Insertion usage permits bend pipe pieces of the whole diameter range and it broadens machine processing capacity. EFFECT: enhanced efficiency. 2 cl, 5 dwg

Description

 The invention relates to the processing of metals by pressure, in particular to roll bending machines.

 Known two-roll plate bending machine containing mounted on the bed forming roll with an elastic coating and a rotation drive, a rigid roll mandrel and a roller rapprochement mechanism.

 A disadvantage of the known machine is the design complexity due to the proximity of the rolls, which also reduces labor productivity due to the need to roll rolls when removing the finished part.

 Known double-roll bending machine, adopted for the prototype, containing mounted on the bed forming roll with an elastic coating and a drive of its rotation and a rigid roll-mandrel, and in the elastic coating of the forming roll along the generatrix there is an open groove designed to remove the bent pipe part.

 The disadvantage of this machine is the limitation on the maximum diameter of the manufactured tubular parts, which due to discontinuity of the working surface of the elastic coating cannot be larger than the diameter of the forming roll.

 The aim of the invention is to expand the technological capabilities of the machine by expanding to a larger side the range of diameters of manufactured tubular parts.

 To this end, a two-roll sheet bending machine, consisting of a rigid mandrel roll mounted on the frame and a drive forming roll with an elastic coating, in which an open groove is made along the generatrix, while it is equipped with an insert of elastic material in the shape of the groove of the forming roll, spring-loaded in its direction axis and having rollers at the ends, two rods freely mounted on said axis, by means of which the insert is mounted on a forming roll, with the possibility of radial movement, to two pairs stops mounted on the frame through their axis, the first pair of stops is mounted with the possibility of interaction in the extended position with the insertion rollers, the stops of the second pair are made on-off and mounted with the possibility of interaction with the insertion rollers in its position outside the groove, while the stops of the first pair are made in the form hydraulic cylinders installed at an angle to the direction of the trajectory of the rollers, not exceeding the angle of friction between the materials of the stop and the roller associated with the means of supplying signals for the extension of their rods. The two-position stops are equipped with locking ledges for the rollers.

 Known technical solutions allow bending from sheet blanks of tubular parts of arbitrary diameter, however, these machines are structurally complex due to the approach of the rolls, while bending tubular parts on a machine whose forming roll has a longitudinal groove, there is a restriction on the diameter of the manufactured tubular parts more than the diameter of the forming roll. In the invention, by introducing an insert of elastic material in the shape of a groove while maintaining the simplicity of the machine’s design, its technological capabilities are expanded; there is no limitation on the maximum diameter of the manufactured tubular parts. Thus, the invention satisfies the criterion of "significant differences".

 In FIG. 1 shows a two-roll plate bending machine, front view; in FIG. 2, section AA in FIG. 1; in FIG. 3 section BB in FIG. 2; in FIG. 4 illustrates the sequence of the bending process; in FIG. 5 position of the two-position stop when bending parts with the insert turned off.

 The machine has a bed 1 with a forming roll 2 mounted in it with a drive for its rotation (not shown in Fig.) And a rigid removable roll-mandrel 3. In the elastic coating of the forming roll 3 along the generatrix there is an open groove 4. A movable roller is mounted parallel to the axis of the forming roll 2 in the radial direction, the insert 5, made in the shape of the groove 4. The insert 5 is mounted on the axis of the forming roll 2 by means of rods 6 with the possibility of free movement along the guide bushings and is spring loaded in the direction of the axis of the forming roll by springs 7. On the rod x 6, rollers 8 are installed on both sides of the insert 5. Two pairs of stops 9 and 10 are installed on the bed 1 on both sides of the ends of the rolls 2 and 3. The stops 9 are made in the form of hydraulic cylinders and are mounted so that their rods in the extended position cross the path the movements of the rollers 8, and in the retracted position do not impede the passage of the rollers 8. The stops 10 are made on-off with ledges 11 for fixing the rollers 8, and are mounted to interact with the rollers 8 in the position when the insert 5 is outside the groove 4. For removal bent workpiece 12 one of the racks of the frame 1 can be equipped with either a hinged support 13, or the roll mandrel 3 can be made cantilever.

 The operation of the machine is as follows.

 In FIG. Figure 4 shows the sequence of the process of bending a difficult part from a sheet blank for two turns of the forming roll. In position "a" of FIG. 4, the workpiece 12 is pressed against the contact line of the rolls 2 and 3. The insert 5 is located outside the groove 4. The rods of the hydraulic cylinders 9 are retracted. On-off stops 10 in the position of the ledge 11 in the direction of the roll mandrel 2 (see Fig. 2 and 4). When you turn on the rotation of the forming roll 2, the workpiece 12, being carried away under the mandrel roll 3, bends relative to it. The rollers 8 abut against the stops 10 and the insert 5 slides along the surface of the rotating forming roll 2 position “b” of FIG. 4. Simultaneously with this control system, a signal is supplied to extend the hydraulic cylinder rods 9. In the lowered position of insert 5, i.e. when the insert is in the groove 4, the rollers 8 come out of contact with the stops 10, therefore, further the forming roller 2 rotates together with the insert 5, which passes under the mandrel roller 3, participating in the bending of the workpiece 12 as part of the elastic coating of the roll 2. In position " g "of FIG. 4, the rollers 8 come into contact with the hydraulic cylinders 9 installed at an angle to the trajectory of the rod and with further rotation of the forming roll 2, rolling on them, the insert 5 is brought out of the groove 4 to the position “e”, “e” of FIG. 4. In position "e" of FIG. 4, a signal is applied to retract the rods of the hydraulic cylinders 9. after which the insert 9, located on the surface of the roll 2 outside the groove 4, starts to rotate with it the position “g” of FIG. 4. In position "h" of FIG. 4, when the groove 4 of the forming roll 5 is under the mandrel roll 3, position “h” of FIG. 4, the rotation of the forming roll 2 is turned off and the bent part is removed from the machine.

 In the production of tubular parts, the circumference of which is more than 2 times the length of the arc of the cross section of the forming roll 2, the signal for the extension of the hydraulic cylinder rods 9 is position “c” of FIG. 4 is fed after the appropriate number of revolutions of the forming roll 2, which ensures the shaping of pipe parts of the indicated diameters for 3 or more revolutions of the forming roll.

In the production of tubular parts, the circumferential length is smaller than the cross section of the arc length of the forming roll 2, on-off stops 10 are rotated by ¹⁸⁰ (FIG. 5), the rollers 8 come on ledges 11 and during rotation of the forming roll 2 Box 5 does not drop into the groove 4 , which ensures the shaping of pipe parts of the indicated diameters per revolution of the forming roll.

 Thus, the use of the insert allows bending of pipe parts in the entire range of diameters, which expands the technological capabilities of the machine.

Claims (2)

 1. TWO-SHAFT BENDING MACHINE, comprising a rigid mandrel roll mounted on a bed and a drive forming roll with an elastic coating, in which an open groove is made along the generatrix, characterized in that it is provided with an insert of elastic material in the shape of the groove of the forming roll, spring-loaded in its direction axis and having rollers at the ends, with two rods freely mounted on said axis, by means of which the insert is mounted on the forming roll, with the possibility of radial movement, in two pairs the pores mounted on the frame on both sides of the ends of the rolls and from the plane passing through their axis, the first pair of stops is mounted with the possibility of interaction in the extended position with the insert rollers, the stops of the second pair are made on-off and mounted to interact with the insert rollers in its position outside the groove, while the stops of the first pair are made in the form of hydraulic cylinders installed at an angle to the direction of the trajectory of the rollers, not exceeding the angle of friction between the materials of the stop and the roller, are connected with signal supply means for an extension of their rods.  2. The machine according to claim 1, characterized in that the two-position stops are equipped with locking ledges for the rollers.