SU778872A1 - Die for finish punching of holes in piece workpiecies - Google Patents

Description

(54) STAMP FOR CLEANING HOLE HOLES IN PIECE PREPARATIONS

The invention relates to sheet punching and can be used for finishing punching grooves, holes, etc. in piece flat blanks, made by cutting from sheet, strip material or in any other way, as well as for conventional punching in parts that require punching with their simultaneous straightening on the plane (calibration). A stamp for processing piece blanks is known that contains movable and fixed plates, a punch, a die, means for feeding workpieces to a working position, made in the form of a gate, and means for fixing the workpiece in a working position, made in the form of two wedge-shaped and spring-loaded one towards the other parts 1. The disadvantage of this punch is that the fixing wedge-shaped parts do not have the ability to insert, and are only capable of reciprocating movement. This leads to the fact that when the piece blank moves to the working position, it interacts with the parts fixing it under sliding friction conditions, which can cause the blank to skew and unreliable fixation. As the height of the locking parts increases, it becomes impossible to edit the parts along the plane. In addition, the presence of two clamps complicates the design of the stamp, since in the presence of a longitudinal groove on the die a single clamp is sufficient. The means of fixing a known stamp also do not provide fixing, if necessary, the vertical movement of the blanks during processing. It is also known a means of fixing piece blanks to avoid sliding friction when moving the blank and providing for only one locking part. The known means of fixation contains a roller placed with the possibility of rotation, and a lever mounted rotatably around an axis and carrying roller 2 at the end. A disadvantage of this device is that it does not have it without proper modification. can be used in the chip for finishing punching holes in piece blanks, as with a roller height greater than the thickness of the workpiece, it eliminates the possibility of pressing the workpiece along the ends, and when performing it with a height

less than the thickness of the workpiece or an equivalent device does not provide the possibility of fixing the workpiece during the entire stamping process.

Also known is a stamp for finishing punching holes in piece blanks, containing a movable and fixed plate, a punch, a die, a movable clamp, a means for feeding the blanks to a working position in the form of a gibber and a fixing means 3.

The disadvantage of this stamp lies in the insufficiently secure fixation of the workpiece at the working position.

The purpose of the invention is to increase the reliability of fixation.

The goal is achieved by the fixation means made in the form of a disk located on the clamp with the possibility of rotation in the plane of the clamp, and a lever mounted on an axis placed in the fixed plate of the stamp, with the possibility of simultaneous movement with the clamp holding the disk on the free end and equipped with a spring, the force of which is directed parallel to the direction of movement of the pressure, and another spring that turns the lever in a plane perpendicular to the direction of movement of the pressure.

FIG. 1 schematically shows the proposed stamp, general view, section; in fig. 2 - the lower part of the stamp, top view.

The stamp comprises an upper plate 1 on which a fastening plate 2 with a spherical support 3 is installed and inside which the system of pushers 4 and 5 with a rocker 6 is rammed, which serves to remove the notches 7 from the matrix 8 and create a counterpressure when punching the blanks 9, and the bottom plate 10 with fixed stationary punches 11, a movable clamp 12, slide feed and the locking device. The locking device comprises a disk 13 with an axis 14 fixed in it, a lever 15, at one end of which the axis with a disk rotates. The lever itself is rotated relative to the spring loaded from the bottom in the vertical direction by the spring 16 of the axis 17. The length of the axis 17 is controlled by the cap 18 screwed on its upper end. A spring 19 acts on the end of the lever with an axis 14. The pushers 20 in the lower plate of the stamp, as well as the system of pushers in the upper plate of the stamp, are driven by hydraulic cylinders — upper and lower — placed respectively in the slider and press table for final cutting. The feed gate is attached to the lower plate of the stamp and consists of the body 21, the gate 22, the levers 23 and 24, and the springs 25 and is driven by a stop 26 mounted in the upper plate of the stamp. On the stamp installed shop 27, from which the gate 22 moves the workpiece. In order to increase the accuracy of the interaction with the supply of clamping billets from a constant level of movement of the gate to the spring-loaded clamp on the top plate of the punch, a cutter 28 is installed. installed on the top plate shtampa .- (

The stamp works as follows. . The magazine 27 is stacked with the foot of the workpiece 9 and, manually moving the gate 22,

serves the first billet in the area of punching. The press is turned on, the upper plate 1 of the stamp starts to fall down. In this case, the wedge 32 removes the tray-ejector 30 from the die space, the stop 26, acts on the levers 23 and 24, retracts the gate 22, and the next workpiece falls from the magazine 27 to the feeding position. The cutter 28 is wedged into a solid chain of blanks at the gap between the clamp 12 and the slide feed body 21 and pushes them apart.

0 Upon further movement of the top roll, the matrix 8 contacts the punched workpiece 9 and the latter is clamped by the matrix and the clamp 12, in this case the part is edited on the plane, since the clamp is fed through the pushers 20 through the pushers 20

 lower hydraulic cylinder press. At the end of the stroke, the blank is punched with a stationary punch 11, a counterpressure uril is created from the upper hydraulic cylinder of the press through the pushers 4 and 5 and the rocker 6. After this, the upper plate 1 of the punch begins to rise, the billet 12 is punched off the punch 11 and remains on the clamp, cuttings 7 remain in the matrix 8. The cutter 28 delays the feeding of the next billet into the piercing position until the pressing force 12 is removed from the pierced billet. Thereafter, the gate 22, moving forward under the action of the springs 25, feed in another workpiece to the starting position and the punching position it vozdeyl stvu on disc 13 rotates and presses it, and ejects the finished part with the piercing position, after which the disc 13 is returned by the spring 19 and fixes the workpiece. At the same time, the ejector tray 30 is returned to the die space by the action of the torsion spring 31. At the end of the upward stroke, the pushers 4 and 5, which are affected by the press of the upper cylinder of the press, push the notches 7 out of the matrix 8 onto the ejector tray 30. Thereafter, the cycle

repeats.

The clamp 12 with columns in the proposed clamp is guided along the sleeves installed in the bottom plate 10, simultaneously performing the function of guiding the punches 11, which are mounted in the bottom plate along the movable fit, which allows you to quickly replace out-of-stock punches without removing the stamp from the table press.

Claims (1)

Claim A stamp for fine punching holes in piece blanks containing a movable and fixed plate, punch, die, movable clamp, means for supplying blanks to a working position, and means for fixing the blanks at a working position, characterized in that, in order to increase the reliability of fixation, the fixing means is made th form of the disk located on the clamp with the possibility of rotation in the plane of the clamp, and the lever mounted on the axis located in the fixed plate of the stamp, with the possibility of joint movement with the clamp, bearing on the free end of the disc and provided with a spring force directed parallel to the direction of movement of a clip, and the spring, the lever ¹ is rotated in a plane perpendicular to the direction of movement of the pressing.