SU963606A1 - Machine for expansion bending - Google Patents

Description

The invention relates to the processing of metals by pressure, in particular to machines for bending workpieces with stretching.

A machine for stretching bending is known, which is closest to the invention in technical terms and results achieved, comprising a frame in which two carriages move along guides. Each of them has a rotatable faceplate with a cam resting on a roller. The machine is equipped with a pre-stretch mechanism for the workpiece, faceplate turning mechanisms and til- carriage return mechanisms.

In addition to bending, stamping, punching and cutting of the workpiece to size can be carried out on such a machine. For this, the machine is equipped with additional units. At the same time, punching, winding-up and cutting are done while removing the pre-stretching, because if these operations are carried out in an extended part, then the hole will change its shape when punching, when cutting the edge, the part will break, and when cutting the cutting line .

To eliminate these disadvantages, it is necessary to remove the pre-stretch. However, releasing the stretch before performing the above-mentioned additional operations will cause distortion of the part geometry, since during bending with stretching there is also some residual spring back of the part. Therefore, the blank is bent

10, at the time of the removal of the stretch, can be slightly displaced relative to, for example, the hole-piercing units. In addition, the carriage return assemblies are constantly tightening the face plate cams

15, to the rollers and, when relieving tension, the pushing force of the nodes is transmitted to the workpiece, which in addition to springing will increase the distortion of its geometry and mixing relative to

20 knots for additional operations.

The aim of the invention is to improve the quality of the workpieces by fixing the carriages after removing the stretch before performing additional operations.

For this purpose, a bending machine with stretching containing two movable carriages mounted on the frame, each carrying a rotary

Claims (2)

30 the faceplate with the cam interacting with the roller, the mechanism of stretching the blanks and returning the carriages to the initial position, as well as the knots for performing additional operations, are equipped with stop assemblies: each made in the form of a polygon on the carriage with adjustable casing, slider with a faceplate mounted on the slide spring-loaded latch and mounted stationary on the frame of the interacting latch stops. The stop is installed with the ability to adjust its position. Figure 1 shows the proposed machine, a General view in the initial position; in FIG. 2, the same in the final position; in FIG. 3 node 1. in FIG. 4 - node AND FIG. 2; FIG. 5, section A-A of FIG. 3. The machine consists of a frame 1, in the guides of which two carriages 2 move, each of them has a rotary faceplate 3 with a cam 4; which, when rotated, contacts the roller 5 associated with the pre-stretch mechanism b, clamping units 7, bending copiers 8 and punching units 9 are installed on the plan of the washers 3 To return the carriages 2B to the starting position and for constant pressing of the cam 4 to the roller 5 10 return mechanisms serve. Rotation of the faceplate 3 to the desired angle is made by the power cylinder 1.1, which transmits its force through the cross bar 12 and the girth 13. On the carriage 2 there is a stopper node consisting of the body 14, the slider 15, the spring 16, the retainer-17, the adjustable grommet 18, bracket 19, h .-; to the fastened on faceplate 3, and the stop 20 fixed to the base 1, the locking screw 2 keeps the stop 20 from being displaced, the bolt 22 restricts the movement of the hydraulic cylinder rod 11. The machine works as follows. After installing the workpiece 23 and fixing its ends in the clamps 7, the pre-stretch mechanism b is activated. Then, the hydraulic cylinder 11 rotates the plan washers. 3, as a result of which the workpiece 23 is wound on copiers 8 and joins the required shape. Instead of a faceplate 3, the bracket 19, which through traction 18 moves the slider 15, expands. This compresses the spring K), which presses the clamp 17 to the stop 20, Cam 4, based on the conditions of the bending process on such machines, has a profile that provides when turning the faceplate, stretch the workpiece. Thus, the carriages 2 are rotated during the rotation, the plate 3 is moved in different directions to continue; (to stretch the workpiece. Over time, the movement of the carriages 2, the retainer 17, Logged by the spring 16, slides on the stop 20 and at the end of the rotation of the faceplate 3 (the bolt 22 reaches the stops) engages the protrusion of the stop 20, the moment the retainer 17 engages with the stop 20, it is easy to adjust as the stop has a groove for the fastening screws allowing for adjustment, then the pre-stretching mechanism is turned off, the rollers 5 are retracted, the workpiece elongation is reset, and the retainer 17 is engaged with the shoulder 20 holding back The carriages 2, which the return mechanism 10 tends to return to its original position. The stop 20 from shear under load acts to protect the locking screw 21. Thus, the movement of the carriages 2 after the pre-stretch has been dropped is eliminated. Rotation of the chuck 3 is also impossible, since on the one hand, the limiters are the glands 13 and the hydraulic cylinder 11, the rod of which supports the liquid column, and on the other, the stop bolt 22. Therefore, the workpiece is bent after the pre-stretching is removed and fixed in the correct position This eliminates the distortion of its geometry, the displacement under the action. elastic deformation forces with respect to knotting knots 9, i.e. optimal conditions are created for additional operations. After the nodes 9 perform additional operations, the clamps 7 are opened, the finished product is removed, and the hydraulic cylinder 11 through the yoke 12 and the rod 13 rotates the faceplates 3. to its original position. At the same time, croc1;): sein 19, acting through 18 on the slider 15, pushes the latch 17 away from the stop 20, the carriage 2 under the influence of the mechanisms 10 of returning the retrigue-oats to its original position until the cams 4 enter in ..: octact with rollers 5, after e. : .o the machine is ready to repeat the cycle. CTonopeniie of the mobile units of the machine during the period of the work. Allowing the work cycle to allow | ;; .- 1at to remove the stretching of the workpiece and create optimal conditions for performing additional operations, which improves the quality of the manufacturing parts. Claims 1. The machine for bending with stretching, containing installed on the frame, two moving carriages, carrying a hinged swivel faceplate with cams 1, interacting with the roller, mechanisms for stretching the carriage return blanks to their original position, as well as nodes for performing additional operations, in order to improve the quality of the blanks by fixing the carriages after removing the stretch before performing additional operations, it is equipped with locking assemblies, each made in the form of a slider placed on the carriage with a body, an adjustable rod connecting the slider with the slider yboy mounted on a spring-loaded slide fastener thereto and fixedly mounted on the mill is not interacting with the locking abutment, 2. The machine according to claim 1, differs from the fact that the stop is installed with the ability to adjust its position.  SourcesInformation: taken into account during the examination 1. For France of France 2224217, cl. In 21 D 7/025, published 1975 (prototype), 3 i ff 1 / city / / J fe /