SU1819712A1 - Method and consecutive action stamp for production of u-shaped pieces from metal strap - Google Patents

Description

The invention relates to the processing of metals by pressure, in particular to methods and devices for the manufacture of products from sheet material, mainly staples with oblique edges.

The purpose of the invention is the expansion of technological capabilities through the manufacture of parts with oblique ends of bent shelves.

In FIG. 1 schematically shows a preliminary cut of an oblique edge in a metal strip; in fig. 2 - cut blanks with oblique edges: in Fig. 3 - detail after bending: in Fig. 4 - the same, side view; in Fig. 5 - a stamp for obtaining U-shaped parts, section A-A in Fig. 6: in Fig. 6 - the same, bottom plan; in fig. 7 - section B-B in Fig. 6; in fig. 8 is a section B-B in FIG. 6.

A stamp for obtaining U-shaped parts such as staples from a metal strip contains an upper plate 1, on which a punch 2 is installed for preliminary cutting of the oblique end of the metal strip in zone A, a punch 3 for the final cut of the workpiece 4 with sharp edges, a punch 5 for bending the part 6 , wedge 7. punch holders 8, 9. upper clamp 10, detipper 11. On the bottom plate 12 mounted guide bars 13, 14, matrix 15 for pre-cutting the oblique end of the strip, matrix 16 for bending parts 6, mechanisms for moving the workpiece 4 from zone B pieces to zone To bends and zone

1819712 A1

G of the failure hole consists of a slider 17 with rods 18 built into it, on which a frame 19 is installed to hold the part 6 in a vertical position and ensures that the part 6 moves one step into the zone of the failure hole, the return spring 20 of the slider 17, the clamp 21 of short-term action and horizontal spring-loaded clamps 22, as well as springs 23 for vertical movement of the clamp. Clamp 24 for ejecting the finished part 6 from the matrix 16 using springs 25.

The method is carried out as follows.

The metal strip is fed into the first (1) working stream between the guide bars 13, 14 until it stops in zone A and the oblique end of the strip is preliminarily cut off at a predetermined angle.

Then a strip with an oblique end is fed into the second (II) working stream in zone B until it stops for the final cut of the workpiece with oblique edges to a predetermined width. The workpiece 4 at the moment of cutting from below is supported by a short-term clamp 21. Clamp 21 after cutting off the workpiece 4 goes down to the plane of the bending matrix 15 and remains in the lower position until the wedge 7 disengages from the slider 17. In this case, the clamp 21 is held in the lower position due to the clamps 22. As soon as the wedge 6 the die disengages from the crawler. coy 17, the crawler 17 is returned to the left. By means of the rods 18, the flat workpiece 4 is transferred one step into the bending zone B. Clamp 21 after the release of the rods 18 from the cutting zone returns up to the initial level of the strip, and the clamps 22 will disengage the rods 18 from the bottom up. The bent part 6 is moved by the frame 19 from zone C to zone G of the failure hole. Then the cycle continues only - l. in the second working stream until the metal strip is completely used

Claims (2)

Claim 1. A method for manufacturing U-shaped parts from a strip, in which the workpiece is cut off from the strip along a line intersecting with the side edges of the strip, and the workpiece is bent along lines perpendicular to the cut line, characterized in that, in order to expand technological * opportunities due to the manufacture of parts with oblique ends of bent shelves, before cutting off the workpiece, a part of the strip is cut off along a line inclined relative to the side edges, and the line of cutting the workpiece is placed parallel to the line of cutting off the part of the strip. 2. A stamp of sequential action for the manufacture of U-shaped parts from a strip, containing a movable plate, on which there is a knife for cutting off the workpiece, a punch for bending and a wedge and a fixed plate, on which a stream is made to move the strip and a failure window, and a knife is located for pieces of the workpiece, a matrix for bending, an emphasis for fixing the strip and a mechanism for moving the workpieces, including a slider. located with the possibility of interacting with the wedge and moving in a plane perpendicular to the pressure axis, and a spring associated with the slider and the plate, characterized in that an additional stream is made on the fixed plate for moving the strip 25, the stamp is equipped with knives for cutting off part of the strip located on the movable and fixed plates, and an additional stop for fixing the strip, located on the fixed plate, this stop knife for cutting off part of the strip is placed at the exit from the additional stream, the cutting edges of the knives for cutting off part of the strip are located at an angle to the additional stream for moving ¹ strip, and the cutting edges of the knives for cutting off the workpiece, the working surfaces of the punch and the matrix for bending and the direction of movement of the crawler are located at an angle to the stream for moving the strip. ¹ 3. Stamp pop. 1, characterized in that it is equipped with a clamp located on a fixed plate opposite the knife for cutting off the workpiece and equipped with springs, means for fixing the clamp relative to the slide in the direction parallel to the pressure axis, including latches, each of which is located in the clamp with the possibility of movement perpendicular to the axis of pressure and interaction with the slider and is equipped with a spring and means for moving the part to the failure window in the form of a stencil mounted on the slider above the bending die, and the failure window is located behind the bending die during processing. A to - B 22 23 21 H 23 22 Fig.B