RU2292974C2 - Apparatus for double-sided bending of tubes in two planes - Google Patents

Abstract

FIELD: plastic working of metals, in particular, bending of sections from tubular blanks.

SUBSTANCE: apparatus has horizontal bending unit and vertical bending unit which are mounted on frame and provided with bending arms fitted on shafts, drives for moving said units, and blank retainer. Horizontal bending unit has clamp-mold positioned for displacement along guiding columns rigidly fixed on frame, said clamp-mold being secured through foldable levers to pneumatic cylinder rod and having contour conforming with ready part and coming into contact with blank during bending process. Said contour has radial part in the form of half-trough and movable cheeks equipped with oval openings and radial part having radius corresponding to that of horizontal bending unit and terminating in curved portion. Lower portion of radial parts is made in the form of fork and feelers equipped with projections arranged at an angle relative to path of displacement of clamp-mold. Feelers may be adjusted for accurate positioning of movable cheeks by cooperation with fork and by moving along guiding planks fixed on clamp-mold and shouldered pin, which are set on shafts positioned for rotation through rack-and-gear mechanisms. Slide block has working contour formed as half-trough, whose upper part is terminated with curved portion. Curved portions of cheeks and curved portion of half-trough of slide block are formed on condition that molds of vertical bending unit define single groove upon termination of horizontal bending process.

EFFECT: increased efficiency, simplified construction and enhanced reliability in clamping of blank.

6 dwg

Description

The invention relates to the processing of metals by pressure, in particular to a device for bending profiles from tube blanks, and can be used in various industries.

A known machine for double-sided pipe bending, comprising a bending unit mounted on a bed in the form of a movable yoke with bending levers and rollers, half patterns with support rollers and a drive for their oncoming movement, a fixing unit.

The disadvantage of this technical solution is the impossibility of double-sided bending of the pipe in two planes due to the lack of a bending unit located in a plane different from the horizontal plane of the bend (see the description of the invention to AS No. 1449176, MKI B 21 D 7/024).

The closest in technical essence is a machine for two-way bending of pipes, containing a frame on which are mounted nodes of horizontal and vertical bending with bending levers mounted on shafts, drives for moving them and the workpiece lock (see the description of the invention to AS No. 1304958, MKI B 21 D 7/02).

The disadvantage of this machine is the inability to perform bending of the workpiece, in which the center of the radius of the vertical bending template should be close to the center of the radius of the horizontal bending template. This is hindered by the design of the assembly (the vertical bending template rests against the horizontal bending template when working), as well as the inability to remove the workpiece from the templates when bending at an angle of more than 90 °. When bending at an angle of more than 90 °, the removal of the workpiece is prevented by the sides of the copiers, made at half the circumference of the bending radius. The workpiece is fixed by turning the lever under its own weight, that is, there is no reliable clamping of the workpiece, as a result of which, when bending, the workpiece can move, from which the lengths of the bent ends of the workpiece can be different.

The technical problem to which the invention is directed is the expansion of technological capabilities by manufacturing parts having a double-sided bend in planes in which the horizontal and vertical bends are close to each other, more reliable clamping of the workpiece by clamping directly between the clamp and the clamp template, compactness and simplification of the design of nodes of vertical bending due to the absence of a gearbox in it.

The means of achieving the technical result is that in the proposed device, including horizontal and vertical bending units mounted on the bed with bending levers mounted on the shafts, their movement drives and workpiece clamps; the horizontal bending unit is made in the form of a movable clamp - a template fixed through breaking arms to the rod of the pneumatic cylinder, which is contiguous with the workpiece during bending and is made in the form of the finished part and has a radius part in the form of a semi-groove, movable cheeks made with oval holes, and a radius part corresponding to the radius of the horizontal bend, ending with a curve, the lower part of which is made in the form of a fork , copiers having protrusions located at an angle relative to the movement of the clamp - template, and made with the possibility of adjustment for the exact installation of the movable cheeks, by interacting with the fork and the ability to move along the guide rails fixed to the clamp - template and axles with a shoulder mounted on shafts having the possibility of rotation through rack-and-pinion gears, rusks and with a working contour in the form of a semi-groove, the upper part of which ends with a curve, while the curves of the cheeks and the curves of the semi-groove of rusks olneny formation conditions of the vertical bending assembly template as a single stream after the completion of horizontal bending.

The invention is illustrated by drawings:

Figure 1 shows a General view of the device.

Figure 2 - finished part.

Figure 3 - blank.

Figure 4 is a view A along the arrow in figure 1.

Figure 5 - view C in the direction of the arrow in figure 4.

In Fig.6 - section B - B in Fig.1.

The device for double-sided bending in two planes contains a latch 2 mounted on the bed 1, the horizontal bending unit includes a movable clamp - template 3, the contour of which is in contact with the workpiece 4 when bending, is made in the form of the finished part 5, and the radius part is in the form of a half groove 6 fixed through breaking arms 7 to the rod of the pneumatic cylinder 8, and is arranged to move along the guide columns 9; movable cheeks 10 rigidly attached to the bed with oval openings. The movable cheeks have a radius part corresponding to the radius of the horizontal bend, ending with curve 11, and the lower part is made in the form of a fork 12 for interaction in copiers 13, the protrusions 14 of which are made at an angle relative to the movement of the clamp template, and the copiers themselves are made with the possibility of adjustment using an adjusting screw for the exact installation of cheeks moving along the guide rails 15 and axis 16 with a shoulder fixed to the clip template; crackers 17 with a working contour in contact with the workpiece during bending, made in the form of a semi-groove 18, the upper part of which ends with curve 19, are mounted on shafts 20, rotated by pneumatic cylinders 21 through rack and pinion mechanisms 22; the vertical bending unit is made in the form of templates consisting of a curve of cheeks and a curve of a half-groove of crackers, forming a single stream after horizontal bending, of bending levers 23 rigidly mounted on shafts 24, driven into rotational movement through levers 25 using pneumatic cylinders 26.

The device operates as follows.

The workpiece 4 is laid with the molded middle part in the latch 2 (if the workpiece does not have a molded middle part, then it is laid all the way to one of its ends, the emphasis is not shown). The pneumatic cylinder 8 is turned on, which, through the breaking arms 7, moves the clamp template 3 along the guide columns 9 until the workpiece 4 is clamped between the retainer 2 and the clamp template 3. The movable cheeks 10, moving together with the clamp template 3, with their forks 12 slide along the protrusions 14 of the copiers 13, move along the guide strips 15 and the axes 16, oval holes, covering the workpiece 4. The vertical movement of the movable cheeks 10 is limited by the protrusion 14 in the guide strips 15 and the shoulders of the axis 16. At the end of the movement, the movable cheeks 10 together with 17 Uhar cover blank 4 which is in place between the bending clamp 6 poluzhelobom template 3, the movable jaws 10 and crackers 17, thereby preventing the formation of ovality of the pipe during bending. The pneumatic cylinders 21 are turned on, which through the rack-and-pinion mechanisms 22 rotate the crackers 17, bending in the horizontal plane relative to the radius of the clamp template 3. At the end of the bending, the crackers 17 stop and a single stream (templates) of vertical bending is formed from curve 11 of the cheeks and curve 19 the half-groove 18 of crackers 17. The pneumatic cylinders 26 are turned on, which rotate the shafts through the levers 25 with 24 bending levers 23 rigidly fixed to them, which rotate the upper part of the half-grooves 18 around the axes installed in the lower Asti poluzhelobov producing bending in the vertical plane. The pneumatic cylinders 26 are turned on and the shafts 24 with levers 25 are returned to their initial position, then the pneumatic cylinders 21 are turned back and the crackers 17 are returned to their original position, the pneumatic cylinder 8 is turned back and, using the breaking arms 7, retracts the clamp template 3 together with movable cheeks 10. In this case, movable cheeks 10, sliding with their forks 12 along the protrusions of the copiers 13, are shifted to the axes 11 of the device and out of contact with the finished part 5. Part 5 is removed from the working area and the cycle repeats.

The proposed device provides the manufacture of parts in which the horizontal and vertical bends are close to each other, more reliable fixation of the workpiece, compactness and simplification of the design of nodes of vertical bending.

Claims (1)

A device for double-sided bending in two planes, comprising horizontal and vertical bending assemblies mounted on the frame with bending levers mounted on shafts, drives for moving them and a workpiece lock, characterized in that the horizontal bending unit is made in the form of being able to move along the guide columns, rigidly fixed on the bed, a movable clamp template, fixed through breaking arms to the rod of the pneumatic cylinder, the contour of which is in contact with the workpiece during bending is made according to It has the radius of the finished part and has a radius part in the form of a semi-groove, movable cheeks made with oval holes and a radius part corresponding to the radius of the horizontal bend, ending with a curve, the lower part of which is made in the form of a fork, copiers having protrusions located at an angle relative to the movement of the clamp template and made with the possibility of adjustment for the exact installation of the movable cheeks by interacting with the plug and the ability to move along the guide bars and axes fixed to the clamp template with a collar mounted on shafts that can rotate through rack and pinion mechanisms, crackers with a working contour in the form of a semi-groove, the upper part of which ends with a curve, while the curves of the cheeks and the curves of the semi-groove of crackers are made from the conditions for the formation of templates of a vertical bending unit in the form of a single stream after completion of horizontal bending.

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