RU2373011C2 - Sheet bending machine for bending workpieces 0,5 to 1 mm thick - Google Patents

Abstract

FIELD: metallurgy industry.

SUBSTANCE: invention refers to cold bending of sheet metal, and namely to bending of workpieces 0.5 to 1 mm thick in small-scale manufacturing conditions. Sheet bending machine consists of a stand, a bending mechanism, a hold-down frame with a drive, and lever eccentric hold-down mechanism interacting with hold-down frame. At that, stand is welded and made in the form of at least two pairs of diagonal braces connected by longitudinal and transverse braces. Hold-down frame is made in the form of longitudinal tube freely installed in restrictors on diagonal braces of the stand, where length of the above tube is equal to the stand length, transverse profiles welded to it above each pair of diagonal braces and operating part in the form of an angle connected to free edges of the above profiles. Hold-down frame drive serves for pre-clamping and is foot-controlled, and lever eccentric hold-down mechanism serves for final clamping of the workpiece and is made in the form of hold-down levers and eccentrics connected to each other by means of a tube. At that, eccentrics are fixed in brackets installed on transverse braces of the stand so that they can interact with transverse profiles of hold-down frame.

EFFECT: efficiency is increased and operating conditions are improved.

3 cl, 1 dwg, 1 ex

Description

The invention relates to cold bending of sheet metal, namely, to bending workpieces with a thickness of 0.5 to 1 mm in conditions of small-scale production.

Known plate bending machine (www.tapcoint.corn).

This machine has a bed, a bending mechanism, a clamping frame with a manual drive, a lever eccentric clamping mechanism interacting with the clamping frame. The clamping frame and the lever eccentric clamping mechanism are connected directly to each other. Therefore, at least two workers are required to work on the machine. Before installing the workpiece, one worker lifts the clamping frame with his hands, the other worker sets the workpiece and supports it. Then the first worker lowers the clamping frame, pre-pressing the workpiece. Next, the bending line is adjusted, the workpiece is finally pressed by the lever eccentric mechanism, and the workpiece is bent by the bending mechanism.

A disadvantage of the known machine is its very low productivity.

The objective of the invention is to increase productivity and ease of use.

This problem is solved in that in a bending machine for bending workpieces with a thickness of 0.5 to 1 mm, containing a bed, a bending mechanism, a pressure frame with a drive, a lever eccentric pressure mechanism interacting with the pressure frame, the bed is welded in the form of at least two pairs of diagonal ties connected by longitudinal and transverse bonds, the clamping frame is made in the form of a longitudinal pipe, freely installed in the limiters on the diagonal connections of the bed frame, with a length equal to the length of the bed welded to it hell with each pair of diagonal ties of the transverse profiles and the working part in the form of a corner connected to the free ends of the said profiles, the clamping frame drive serves for preliminary clamping and is made foot, the lever eccentric clamping mechanism serves for final clamping of the workpiece and is made in the form of clamping interconnected levers with eccentrics, the latter being fixed in brackets mounted on the transverse connections of the bed with the possibility of interaction with the transverse profiles of the clamp me frames.

In this case, the brackets with the eccentrics of the lever eccentric clamping mechanism are mounted to move along the transverse axis of the bed.

In this case, the foot drive of the clamping frame is made in the form of a cable block mechanism, one end of the cable of which is mounted on the transverse profile of the clamping frame, and the other on the pedal.

The drawing shows a General view of the bending machine.

The machine contains a bed, which is a welded structure, consisting of at least two pairs of diagonal ties 1 connected by longitudinal 2 and transverse 3 bonds. A clamping frame equipped with a foot drive is located on the bed, which includes a longitudinal pipe 4 for the entire length of the bed, and transverse profiles 5 welded to it over each pair of diagonal connections 5. The free ends of the profiles 5 are connected through plates 6 by bolted connections 7 to the working part of the clamping frame in the form corner 8. The pipe 4 of the clamping frame is freely installed in the stops 9 on the diagonal connections 1. The clamping frame interacts with the lever eccentric clamping mechanism. Namely, the transverse profiles 5 of the pressure frame interact with the corresponding eccentrics 10 of the pressure arms 11 connected to each other by the pipe 12. The eccentrics 10 are mounted on the brackets 13 with the possibility of rotation on the axes 14, and the brackets 13 are mounted on the transverse connections 3 of the frame with the possibility of movement along the transverse the axis of the bed due to bolt connections 15. To increase the area of contact of the eccentrics 10 with profiles 5, plates 16 are provided.

The bending mechanism of the machine includes pivotally connected upper 17 and lower 18 corners and a lever 19. The hinge 20 is made in the form of a piano loop for the entire length of the bed and is welded to the corners.

The upper corner 17 serves to locate the workpiece on the machine and is fixed by bolted connections 21 on the diagonal connections 1 of the bed through the plates 22 welded to them. The lever 19 is fixed on the lower corner 18.

The foot drive of the clamping frame comprises a stand 23, a console 24, on which the axis of rotation 25 of the block 26 is fixed, a cable 27, one end of which is fixed on the clamping frame (on the transverse profile 5), and the other end is fixed on the pedal 28.

The machine operates as follows. Pressing the foot on the pedal 28 of the cable block mechanism raises the clamping frame until the necessary clearance is formed between the working part 8 of the clamping frame and the upper corner 17 of the bending mechanism. The workpiece 29 with the proposed bending line is laid in the formed gap and preliminarily clamped. To do this, lower the clamping frame by removing the foot from the pedal. Then, the estimated bending line is adjusted by combining it with the longitudinal edge of the working part of the clamping frame - corner 8 and the final workpiece is clamped. For the final clamping of the workpiece, the pipe 12 of the lever eccentric mechanism is lifted and the clamping levers 11 with the clowns 10, which were in the free state, are turned until the latter stops in the transverse profiles 5 of the clamping frame. Then bend the workpiece by raising the lever 19 of the bending mechanism to the desired angle. This completes the bending process. The clamping levers 11 are rotated to their original position. Pressing the pedal 28 raise the frame and remove the workpiece from the machine. Next, the bending process is repeated.

In the process, to adjust the feed depth and increase the clamping force of the workpiece, the bracket is moved along the transverse connections 3 of the bed.

Example

The frame construction 2500 mm long of five pairs of diagonal ties 1, longitudinal 2 and transverse 3 ties is welded by electric welding from metal profiles 40 × 60.

The clamping frame is made of pipe 4 with a diameter of 57 mm, to which five transverse profiles 40 × 60 are welded.

The working part of the clamping frame is made of corner 8 with a length of 2600 mm.

The bending mechanism is made of corners 17 and 18 of size 75 and 65.

The clamping levers 11 are made of a pipe with a diameter of 18 mm, the pipe 12 connecting them is also made of a pipe with a diameter of 18 mm.

The rack 25 and the console 24 of the foot drive are made of profiles 40 × 60, the cable 27 is 5 mm in diameter.

Claims (3)

1. A bending machine for bending workpieces with a thickness of 0.5 to 1 mm, comprising a bed, a bending mechanism, a clamping frame with a drive interacting with a clamping frame, a lever eccentric clamping mechanism, characterized in that the frame is welded in the form of at least two pairs diagonal ties connected by longitudinal and transverse bonds, the clamping frame is made in the form of a longitudinal pipe freely installed in the limiters on the diagonal connections of the bed frame, equal to the length of the bed welded to it above each pair of the diagonal connections of the transverse profiles and the working part in the form of a corner connected to the free ends of the mentioned profiles, the clamping frame drive serves for preliminary clamping and is made foot-operated, the lever eccentric clamping mechanism serves for final clamping of the workpiece and is made in the form of clamping levers interconnected by a pipe with eccentrics, while the latter are fixed in brackets mounted on the transverse connections of the bed with the possibility of interaction with the transverse profiles of the clamping frame. 2. The machine according to claim 1, characterized in that the brackets with eccentrics of the lever eccentric clamping mechanism are mounted to move along the transverse axis of the bed 3. The machine according to claim 1, characterized in that the foot drive of the clamping frame is made in the form of a cable block mechanism, one end of the cable of which is mounted on the transverse profile of the clamping frame, and the other on the pedal.

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