RU2638465C1 - Method and device for bending thin-sheet metal - Google Patents

Abstract

FIELD: metallurgy.

SUBSTANCE: bending is carried out by one rotary die and blade-type plate punch performing the functions of abutment. The rotating punch is always located on the bisector of the bent blank inner angle and the second half-die and the free side of the sheet remain stationary. The bending mechanism for linear bending of sheet materials with a rotary pressure abutment comprises a composite die of two half-dies, one of which is fixed on the base, and the second one is simultaneously and consistently turned with the abutment by means of hinged fastening on the base. The device further comprises a dividing mechanism configured to provide rotation of abutment by the angle equal to half the rotation angle of the rotating half-die.

EFFECT: expanded technological capabilities.

2 cl, 6 dwg

Description

The invention relates to cold bending of sheet metals, namely, to a bending mechanism for processing workpieces from 0.5 to 2.5 mm as part of a bending machine.

The method of bending sheet metal along straight lines is well known and is used in a wide range of bending presses and bending machines manufactured by domestic and foreign engineering (www.tutmet.ru). Bending occurs beyond the elasticity in the field of plastic deformation of the processed sheet materials.

A known method of linear bending of sheet metal with pressing the workpiece along the bending line to the massive bed on one side and the force on the free part of the workpiece by the rotary structural member of the bending mechanism — the rotary beam to the fixed structural element fixed on the bed — the clamp beam, the shape of which defines a certain bending angle . The working edge of the clamping beam is placed in one vertical plane with the side face of the rotary bending beam, which is installed with the possibility of force acting on the sheet when it is rotated from the installation site to the side of the sheet bending and counteracting the clamping beam. In this case, the load force is distributed along the contact line of the movable and fixed structural member, and the axis of rotation coincides with the bending line. For the manufacture of a part, the following technological operations are necessary: placing a sheet blank on a massive table with setting a bending line that coincides with the axis of rotation of the rotary beam, pressing the blank on the table with a clamp beam and bending it with the pressure of the rotary beam at a certain angle, the minimum size of which is specified by the shape of the clamp beam, cutting the finished part from the sheet blank.

The method of edge bending of sheets with clamping blanks on one side (hereinafter referred to as the “clamp-bending” method) allows for multi-operation processing of a workpiece by pressure to obtain various designs of complex linear shapes necessary for the manufacture of one type of product, for example, metal containers, which cannot be performed on bending mechanisms "matrix-punch". In this case, the second, clamped, side of the workpiece remains in the plane of the table and is ready for use as the original workpiece. The prostate reconfiguration of devices built on this method allows you to organize small-scale production of bent products, such as composite additional parts when performing roofing and other tin works. Technological processes of the method are easily mechanized and automated and are implemented by devices with both a manual drive and an electrohydraulic drive, depending on the thickness of the metal of the sheet stock. In the first case, with a sheet thickness of 0.5-1.0 mm, machines are manufactured with a manual drive in a mobile version for the production of products at the place of their installation. A well-known line of bending machines of domestic and foreign production, the basis of the bending mechanism of which is laid on the “clamp-bend” method (www.listogib.lznpo.ru, www.listogibstanok.ru, www.tapco.ru) with mechanical and electromagnetic sheet fixing.

Known manual bending machine (patent No. 45946 U1, IPC B21D 5/00, publ. 06/10/2005), manufactured by the Samara company (www.ssvb.ru). This most typical model of the machine contains a fixed, fixed on the machine rack, clamping and swivel beams. The fixed and clamping beams are interconnected by a system of levers, eccentrics and adjustable rods, and the node connecting the levers is connected to the rack using a rod that is adjustable in length, while the rotary and fixed beams are connected using loops. Such a constructive implementation of the joining of the beams provides simplicity and ease in setting up, servicing and operating the machine, since there is no need for mechanical threaded fastening of the clamping beam when changing the machine to work with a new workpiece. The lifting of the clamping beam and the subsequent fastening of the sheet in the machine is carried out by simple single raising and lowering of the handle. The machine is equipped with a roller knife for cutting the finished part.

Known bending machine for bending workpieces with a thickness of 0.5 to 1 mm (patent No. 2373011 C2, IPC B21D 5/04, publ. 20.11.2009). The machine includes a bed, a bending mechanism, a clamping frame with a drive, a lever eccentric clamping mechanism interacting with the clamping frame. The drive of the clamping frame serves for preliminary clamping and is made foot-operated, and the lever eccentric clamping mechanism serves for final clamping of the workpiece and is made in the form of clamping levers connected with each other with eccentrics. The bending mechanism comprises an upper corner rigidly connected to the bed, serving as a table for placing the workpiece and a lower corner with a lever, acting as a rotary bending beam and pivotally connected to the upper corner, for example, a piano loop welded to it over the entire length of the bed. The machine is made in a mobile version, it provides the necessary structural rigidity when working with metal with a thickness of 0.5-1.0 mm, has an adjustment of the clamping force of the workpiece, a manual and foot set of drives allows you to carry out all the necessary technological operations to one worker without outside help.

Known plate bending machine (patent No. 42288 U1, IPC B21D 5/04, publ. 10.10.2005), manufactured at the Aleksandrovsky plant of forging equipment. The machine is designed for the production of profiles from sheet metal of various thicknesses. The bending machine with a rotary bending beam contains racks fastened by connecting rods and supporting, bending and clamping beams mounted on them. The drives of the clamping and bending beams are made electromechanical with gear motors. The geared motor of the clamping beam drive is integrated in the support beam, and the bending motor gearbox is integrated into one of the construction sites. The electric drive allows bending sheet blanks of greater thickness compared to manual, which expands the possibilities for organizing mass production of bent profiles in workshop conditions.

The well-known bending electromagnetic machine (patent No. 2317871 C1, IPC B21D 5/00, published on 02.27.2006) solves the problem of permanent deformation of the pressure beam due to its uniform pressure. As the main matrix, an electromagnetic matrix is used, which serves to fix the workpiece, as a pressure matrix, a pressure matrix is used, made with the possibility of removing and replacing from a set of pressure matrices depending on the manufactured products. The hinges are made rotatable, each of which contains a U-shaped bracket that can rotate in the axis and a beam connected to it by one end. The bracket with the axis is rigidly mounted on the body of the electromagnetic matrix. The beam is made with the formation of the other end of the sliding connection in the groove along the circumference of the guide, mounted on the vertical wall of the punch. In this case, the punch is made with the possibility of bending at an angle of 180 ° after performing bending at an angle of approximately equal to 135 °, without the pressure matrix. The machine is designed for the manufacture of containers with a bend angle of the side walls of the cut blank from 0 to 180 °.

The device allows the magnetic strong fixing of the clamping beam and reliable fixation of the workpiece at many points along the entire length, quick replacement and spatial orientation of the interchangeable dies to perform multi-position bending operations by quickly turning on and off the electromagnetic field of the main matrix.

The disadvantage of this device is an increase in mass due to the electromagnetic coil and an increase in energy consumption for the production of a unit of product. In addition, for bending the workpiece at a given angle, a set of working matrices is required.

A common disadvantage of the "clamp-bend" method incorporated in the bending mechanism of the above devices is the effect of alternating loads on the clamp beam fixed to the bed at only two points along the ends of the clamp beam. Alternating loads occur during bending as a result of turning the bending beam around the working edge of the stationary clamping beam. The residual deformation of the clamping beam from repeated exposure to the bending moment of the force of the rotary beam determines the resource of the bending mechanism and the final quality of the linear forms of the finished product. With increasing thickness of the processed sheet billet, technical measures aimed at enhancing the rigidity of the clamping structure, level the above advantages of the method. An equally important drawback of the bending mechanism built on this bending method is the inability to bend the sheet at an angle of more than 135-140 ° in one technological operation due to the finiteness of the angular dimensions of the shape of the pressure beam while ensuring the required bending stiffness.

For the production of serial products, the method of processing blanks with free air bending pressure is most often used when the sheet blank is mounted on stationary spaced supports (interchangeable work dies in bending dies or support pressure rolls in machines with rollers), and the full load is applied between them along the normal to the sheet along the bending line by means of a pressing element (a removable working part of the punch in bending dies or a pressure roll in machines with rollers). The bending mechanism consists of the upper and lower tools: a punch mounted on a traverse and a matrix mounted on a fixed table, and bending is performed between them (Fig. 1a, 1b) (hereinafter referred to as the “matrix-punch” method). For the manufacture of a part, the following basic technological operations are required: preliminary precise cutting of the workpiece for a given part size, sheet placement with a bending line in the working area on the die surface, calibration of the working edge of the punch along the bending line and pressure bending. The punch and die are not limited in size to achieve the required resource for tool stiffness to eliminate their permanent deformation under the conditions of repeated repetitive workloads, which ensures high quality of serial products. Common disadvantages of the “matrix-punch" method in known bending mechanisms are high friction when the edges of the workpiece slide along the working surfaces of the matrix and the need to be equipped with a set of dies for each specific bending angle of the workpiece with an exact reconfiguration of the bending unit. In the first case, additional efforts are required to complete the technological bending operation, and, together with additional equipment, to increased material consumption and energy consumption of the machine as a whole. In addition, with increasing loads, it is necessary to carry out technical measures to maintain the mechanism (lubrication of tools) and to compensate for the deflection of the fixed table on which the matrix is mounted; otherwise, the quality of the products is deteriorated by the repeatability of linear dimensions in the process of serial bending. Known technical solutions of bending devices are mainly aimed at eliminating the above drawbacks by replacing the rigid matrix with a composite lower tool consisting of two rotary half-matrixes, as well as in combination with a rotary punch. The method of bending sheet materials by pressure using rotary half-matrices as the lower tool is known in stamping presses (US patent No. 2505718, class 72-396, 1950) and has been repeatedly improved (Smirov-Alyaev G.A., Weintraub D.A. Cold stamping in instrumentation.- M., 1963, pp. 326-328 and Bending stamp, Aut. St. 576141, M. C. D21D 22/2, D21D 5/02, D21D 37/08, publ. 10/15/1977).

A device for bending sheets is known (patent RU 2015769 C1, IPC B21D 5/2, publ. 07/15/1994, patent holder Lift Ferkaufs gerete - Gazelshaft mbh (AT)), containing the upper punch in the form of a knife, moving reciprocally relative to the bed, transversely to the plane of the sheet and, if necessary, having the possibility of rotation, and the punch is located opposite two plate lower punches, which have the ability to rotate about a common axis passing in the bend zone of the sheet. Moreover, to rotate the punch there is a rack-and-pinion gear, and the upper punch in the working position is pressed against the surface of the sheet to be bent, and at the same time forms a stationary counter punch around which the sheet is bent by means of the lower punches. The device is equipped with several pairs of angular levers distributed along the width of the device, each connected in the center by a hinge, and the lower punches are interconnected by means of these pairs. The rotation mechanism of the lower bending punches can be made in the form of several transversely symmetrical gear-rack gears distributed over the width of the device, which allows you to quickly reconfigure the bending mechanism for a specific part. All punches are equipped with electric drives connected to the upper and lower tools by means of gears.

The device allows bending sheet blanks to obtain sharp angles in one technological operation and thereby further reduce energy consumption for the production of a unit of product.

The disadvantage of this device is the design complexity caused by the lack of interconnection of the counter punch, essentially performing the functions of an abutment, with the lower plate semi-matrices, which carry out the bending process around the abutment with their pressure. As a result, fine tuning of the knife-type upper punch is required by turning it around an axis passing along the bending edge of the punch in the bending zone.

According to the set of essential features for a set of technological operations that implement the method, and the composition of the device: the presence of two, upper and lower, rotary tools - a punch and a composite matrix, and free, without pressing, the placement of a sheet blank on the matrix and the desktop, the closest analogue is the well-known a device for bending sheets of metal (patent RU 2290273 C2, IPC B21D 5/02, publ. 12/27/2006), adopted as a prototype that implements the method shown in FIG. 1c.

The device contains two adjoining side faces and serving as a support for the sheet blank of the lower tools in the form of rotary bending beams (essentially rotary half-matrices) and an upper tool in the form of a punch, the working edge of which is placed in the same vertical plane with the adjoining side faces of the lower tools. The lower tools are installed with the possibility of simultaneous rotation from the installation site to opposite sides of the bend of the sheet relative to the working edge of the punch when the force is applied to the sheet. In this case, the lower tools (half-matrices) are installed with the possibility of force acting on the sheet when counteracting the traverse with the punch, for which they are fixed in supports on the frame racks and have levers. In contrast to the separate electric drive of the upper and lower tools of the analogue described above, this device has a common hydraulic drive of two hydraulic cylinders, each of which is secured by a housing at the ends of the beam with a punch and rod ends connected by flexible elements to the levers of the lower tools (half-matrices), thereby ensuring optimal and simultaneous force impact on the sheet from the side of the punch and the side of the bending beams, which reduces the metal consumption and power consumption of the bending mechanism. In addition, the technical solution allows bending of metal sheets of various thicknesses and a length of more than 6 m.

The embedded method in the “punch-matrix” bending devices allows for the implementation of single-operation, pairwise-symmetric bending of pre-cut blanks, including multi-shelf profiles. But during the working stroke of the tools, both ends of the sheet blank move, which creates difficulties in working with large-sized parts, leads to an increase in the working spaces of the machine and, consequently, to an increase in its material consumption. The method is not intended for one-sided edge bending of sheet blanks of large length, which is implemented on edging machines.

The task to be solved by the claimed method and device is to create a bending mechanism that combines the advantages of bending methods underlying devices with a bending mechanism "matrix-punch" for free simultaneous double-sided bending of shelves of sheet blanks to bending angles close to 180 °, in one operation, as well as simple in design listogibochny devices implemented by the method of "clamp-bend" with a rotary bending and stationary clamping beams, with a clamp sheet for one-sided th edging of the workpiece.

The technical result of the invention is to expand the technological capabilities of bending sheet metal by a bending mechanism that implements the claimed method, reducing energy consumption per unit of output by virtually completely eliminating the loss of overcoming the friction forces between the matrix-punch tools and the energy cost of elastic and residual plastic deformation of the pressure beam under the action of alternating load from the side of the rotary bending beam with simultaneous simplification of the design natural devices.

The specified technical result for the object - the method is achieved by the fact that in the known method of linear bending of sheet metal to a predetermined angle by pressure, including feeding a billet of sheet metal into the gap between a vertically mounted plate-type punch of a knife type and half-matrixes fixed in a horizontal position on the base on the basis of two adjacent side faces and its placement on half-matrices, combining the working edge of the punch with a bending line and a line of half-matrices and the bending of the workpiece, the feature is that one half-matrix is mounted on the base motionlessly, and the other is rotatable, bending is performed by force acting on the shelf of a sheet of sheet metal with one rotary half-matrix when it is rotated through the bending angle and the other half-matrix remains stationary while turning a punch made in the form of an emphasis on an angle equal to half the angle of rotation of the rotary semi-matrix.

A method of linearly bending sheet metals by a given angle by pressure is achieved by freely placing the sheet blank on the base worktable and feeding it into the gap between the die and the punch so that the bending zone rests on a die consisting of a fixed and rotary half-matrix; calibration of the working edge of the knife-type movable plate punch along the bend line of a given shelf; the implementation of force from the movable half-matrix by turning it, while the punch, acting as a stop, is located along the entire length of the bending line; bending the workpiece to a predetermined angle by simultaneously and coordinated rotation of the half-matrix and the punch so that throughout the bending process by a given angle controlled by the goniometer, the turning punch is located on the bisector of the internal angle of the bent workpiece; if necessary, reinstall the workpiece for the next bending operation, for example, edging with a narrow shelf, or cut it under a given part (for example, with a roller knife).

Compared with analogs and a prototype, the method allows bending a long sheet at the same time without preliminary precise cutting of a workpiece for a given part, making one-sided edge bending with any shelf-wide width, bending the shelf at an angle close to 180 ° in one operation, taking into account the plate thickness emphasis and residual elastic deformation of the bent workpiece (the so-called "elastic spring"), thereby eliminating the need for an additional set of working matrices / clamping beams.

The indicated technical result for the object - the device is achieved by the fact that the bending mechanism for linear bending of sheet metals to a given angle by pressure comprises two half-matrixes horizontally mounted on the base and touching by side faces and a vertically mounted knife-type plate punch, the working edge of which is placed in one vertical plane with touching the side faces of the half-matrixes, a feature is that one half-matrix is fixed on the base motionless, and the second - w pivotally rotatable from the drive, the punch is made in the form of a stop that can be rotated, while it additionally contains a dividing mechanism for coordinating the angles of rotation of the stop and the rotary half-matrix, configured to provide the rotation of the stop by an angle equal to half the angle of rotation of the rotary half-matrix.

The invention is illustrated by drawings. In FIG. 1 schematically shows the known methods of sheet bending by pressure at a given angle: a) and b) free two-sided bending in stamping machines, where the bending angle is determined by the stroke of the punch and the setting angle of the mono-matrix and at the same time the specified angles of the punch and mono-matrix, respectively; c) the course of the punch and the angle of rotation of the semi-matrices that make up the matrix; d) bending in listogibochny machines with one-sided jamming of the sheet along the bending line and flexible pressure on the sheet by the rotary beam in the direction of the pressure beam, while the minimum bending angle of the workpiece is determined by the reference angle of the pressure beam; d) free one-sided bending by the claimed method with interconnected angles α of rotation of the stop and β of one rotary half-matrix in the ratio α / β = ½, in FIG. 2 shows a side view of the bending mechanism in the context with an operational illustration of the principle of its action according to the claimed method; in FIG. 3 shows a general view of the assembly of the bending mechanism; in FIG. 4 shows the dividing mechanism of the rocker type in the context of a straight view and a section of a side view; FIG. 5 presents photographs of the current model of a manual bending machine and samples of parts manufactured on it; in FIG. 6 presents a profile and a photograph of the trim strip made on the claimed device of the bending mechanism as an example of implementation.

A device, a bending mechanism for linearly bending sheet metals to a predetermined angle by pressure (Fig. 3), comprises a working table 3, for example, in the form of a massive frame-shaped body on which a sheet blank 1 with a shelf 2 exposed for bending is freely placed; fixed semi-matrix 4, built into the base housing 3 and rigidly fixed therein; rotary semi-matrix 5, which performs the functions of a rotary bending beam (arrow shows the direction of movement); rotary plate punch of knife type 6 (the arrow shows the direction of movement), performing the functions of a rotary stop; hinges 7 located at the ends of the device in the horizontal plane of the table, connecting the base, the bending beam and the swing stop (the second hinge is not shown); a mechanism for matching the rotation angles 8 of the rotary stop 6 and the rotary half-matrix 5, for example, of the rocker type (Fig. 4); a device for controlling the internal bending angle of the angle of the workpiece 9, for example, a mechanical goniometer with a radial scale and a flag indicating degrees.

To implement the claimed method, a sheet blank 1 is freely placed on the worktable of the base 3 and fed into the gap between the matrix and the punch on the width of the shelf 2 so that the bending zone rests on the matrix, consisting of a fixed 4 and a rotary half-matrix 5, and the bending line 10 is located on the contact line of the side faces of the fixed 4 and rotary 5 half-matrices, coinciding with the axis of the hinge joints 7; calibrate the working edge of the movable plate-type punch of knife type 5 along the bending line 10 of the predetermined shelf 2, placing the stop in the initial position in the same vertical plane with the axis of the swivel joints 7 by setting it at an angle of 90 ° along the mechanical protractor 9; carry out power pressure with a bending moment exceeding the moment of resistance of the material of the shelf 2 of the sheet blank 1 from the side of the movable half-matrix 5 by turning it, while the punch 6, acting as a stop, is located along the entire length of the bending line of the shelf 2; the shelf 2 of the workpiece 1 is bent at a predetermined angle, controlling it with a mechanical goniometer 9, by simultaneously and coordinated rotation of the half-matrix 5 and stop 6 by the rocker mechanism of the rocker type 8 so that throughout the bending process the internal angle of rotation of the stop 6 and the angle of rotation of the half-matrix 5 were agreed on with ½ respectively; if necessary, reinstall the workpiece for the next bending operation, for example, edging with a narrower shelf, or cut it under a given part (for example, with a roller knife, not shown in Fig. 3).

In FIG. 5 shows a photograph of a working sample of a manual bending machine for bending sheet blanks with a thickness of 0.5 to 1.0 mm, made by the author using the claimed bending mechanism, as well as samples of the obtained products by the claimed method.

As a practical application of the proposed method and device, an example of execution of a trimming strip intended for facing an angular rack of a metal structure, the cross-section of which is shown in FIG. 6. The dimensions of the workpiece are (width / length) 135 × 500 mm, respectively. The cross-section of the bar is an open four-sided multilevel profile with two right angles, as well as acute and obtuse angles of 65 ° and 115 °, respectively. The dimensions of the shelves of the profile made of steel (St3) colored sheet billets with a thickness of 0.5 mm are: 1-2 - 10 mm; 2-3 - 20 mm; 3-4 - 45 mm; 4-5 - 45 mm; 5-6 - 15 mm.

The blank 1 pre-marked along the bending lines (Fig. 3) is fed from the side of the table 3 and the fixed matrix 4 to the width of the first shelf 2 (width 1-2 on the profile) into the gap between the half-matrices 4 and 5 and the stop 6, which are in the initial position: half-matrices 4 and 5 - in horizontal position, emphasis - in vertical at 90 °. The bending line 10 is calibrated (combined along the entire length of the bend of the shelf) with the working edge of the stop and the force acting on the cross beam (not shown in Fig. 3) of the rotary half-matrix 5 bend the shelves 1-2 at an angle of 90 ° (movement of the rotary half-matrix 5 in FIG. 3 is shown by an arrow), controlling the angle of bending by the goniometer 9. In this case, the rocker mechanism of the rocker type 8 provides a stop of the stop 6 coordinated with the semi-matrix 5 by an angle equal to 90 ° / 2 = 45 ° (the direction of rotation of the stop 6 is shown by the arrow). By turning the traverse, the rotary half-matrix is returned to its initial horizontal state and the workpiece is advanced towards the table 3 and the fixed half-matrix 4 by the width of the second shelf 2-3 to the next bending line (Fig. 5 profile point 3) and, similarly to the above operation, the bending of the shelf 2-3 is repeated angle 90 °. Then the workpiece is advanced towards the table by the distance of the total width of the shelves 3-4 and 4-5 (90 mm) to the bending line of the shelf 5-6 of an acute angle of 65 ° (point 5 on the profile) and the shelf is bent in the same way to a given angle. After that the shelf 3-4 is bent to an obtuse angle of 115 °, while the workpiece is fed to the bending line (point 4 on the profile) by feeding the workpiece in the direction of the rotary semi-matrix. Thus, the sequence of operations of bending the shelves at points of a given profile (Fig. 5) is as follows: 2; 3; 5; 4. At the same time, along the bending lines of the shelves of points 2, 3, 4 of the profile, the workpiece 1 is fed towards the table 3 and the fixed half-matrix 4, and points 4 - in the opposite direction, to the rotary half-matrix 5. Considering that after removing the load from the rotary half-matrix, the angle of bending of the shelves increases slightly (by 1-2 °) due to the residual elastic deformation of the metal of the shelves (“elastic spring”), the bending angle is controlled by the goniometer scale after removing the load and by a prefabricated template.

The profile of the trim strip shown in the example cannot be made on any known bending device without reconfiguring the bending mechanism and changing the type matrices operationally.

The claimed method allows to increase the technical and operational capabilities of bending mechanisms for linear bending of sheet blanks by pressure at a given angle while simplifying its design and reducing energy consumption per bending operation.

The device allows you to bend the workpiece at an angle close to 180 °, in one operation, taking into account the thickness of the stop plate and spring elasticity of the material without damaging the surface of the workpiece due to friction between working edges with the interconnected movement of the punch and half-matrix.

The technical solution allows to exclude the formation of so-called deformation patterns on the surface of the workpiece, without applying known additional technical measures to reduce friction and increase the ductility of the workpiece material by heating it.

Claims (2)

1. A method of bending sheet metal, including feeding a billet of sheet metal into the gap between a vertically mounted blade type punch of a knife type and half-matrices fixed in horizontal position on the base on the base and their placement on half-matrices, combining the working edge of the punch with the bending line and the line of contact edges of the semi-matrix and subsequent bending of the workpiece, characterized in that one half-matrix is fixed on the base, and the other with possible with the turning axis, bending is effected by force acting on the shelf of the sheet metal sheet with one rotary half-matrix when it is rotated through the bending angle and the other half-matrix is stationary while the punch, made in the form of a stop, is rotated by an angle equal to half the angle of rotation of the rotary half-matrix. 2. A device for bending sheet metal, comprising two half-matrixes horizontally mounted horizontally on the base and adjoining side faces and a vertically mounted knife type knife-shaped punch, the working edge of which is placed in the same vertical plane as the half-adjoining side faces, characterized in that one half-matrix is fixed to the base motionless, and the second pivotally with the possibility of rotation from the drive, the punch is made in the form of having the ability to rotate the stop, while it is additional it contains a dividing mechanism for coordinating the angles of rotation of the stop and the rotary half-matrix, configured to provide the rotation of the stop by an angle equal to half the angle of rotation of the rotary half-matrix.

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