FR2546776A1 - Device for bilateral upsetting of rods - Google Patents

Abstract

The invention relates to the shaping of metals by plastic deformation. The device which is the subject of the invention is of the type comprising a body 1, in the inclined grooves 2 of which are placed opening half-matrices (dies) 3 provided with hollows which, in the closed position of the half-matrices (dies), form a loading impression 10 and a working impression 11, a crosspiece 4 mounted on a controlled bar 5 and linked to the half-matrices (dies) 3 of the upsetting punches, and a support 7 for the workpieces to be shaped, and is characterised in that it is equipped with a mechanism 14 ensuring the transfer of the workpiece to be shaped from the loading impression 10 to the support 7 and comprising pivoting jaws 15 mounted on the crosspiece 4 and linked kinematically to the bar 5 on which two circular shoulders 19 and 20 are produced, between which the said crosspiece 4 is placed with a clearance and so that it can interact alternately with each of the said shoulders. The device in question may be used, particularly, in the manufacture of rods for isolators (insulators).

Description

 The present invention relates to forming equipment and particularly relates to a device for the bilateral discharge of rods, for example insulator rods.

 It can be applied in various fields of industry for the presentation of workpieces in the machining area, for example in the metalworking, automotive, mining, etc. industries.

 At present, for the presentation of the workpieces in the work area of the forming machines, various devices and mechanisms are used.

Thus, in the device for the repression of rods (see, for example, certificate of inventor
USSR 436,693, Cl. B21 13/08 of 1972), gripping elements mounted in the working area are provided so that they can move vertically for the transfer of the pieces of an engraving to the body. 'other
We know from the inventor's certificate
USSR No. 043,373 B21 to 13/06 of 1973, a device for the presentation of clamp type workpieces, comprising a carriage with jaws, which move from the unloading station to the discharge station.

 However, such a device associated with a shaping machine executes the operations of presentation of the workpieces, the clamping of the die-casting die and the opening of the die in a sequential cycle, which lowers the yield. of the process.

 In addition, such subassemblies and mechanisms can not be used in the devices for the bilateral discharge of parts, because the parts are gripped by their free end.

Typically, in devices for two-sided delivery of stems (eg, USSR Certificate of Invention No. 555,962, B21j 5/08), comprising
opening half-dies, placed in the inclined grooves of a body and having recesses which in the closed position of said half-dies, form a loading footprint and a working footprint, a crossbar mounted on a controlled bar, connected to the half -matrices, points of discharge and supports for the workpieces, located below the half-dies, the workpieces descend in free fall in the gap formed between the half-dies during their displacement and come to move on the supports.

 However, the descent in free fall of the parts lowers the reliability of the device, due to the lack of control of the displacement of the workpiece. The presence of burrs at the ends of the part may cause its cancellation and jamming.

 In addition, such devices have a short service life when operating with heated parts. This results from the fact that the piece brought to the incandescent is in almost permanent contact with the organ of the device that is the most loaded in terms of temperature regime - the half-matrices - which first receive the part to be shaped in the loading footprint, then, gradually opening, allow him to go down on the supports, which take it and bring it back into the work area. The holding of the half-dies at such a regime is 4 to 5 hours for steel parts.

 It was therefore proposed to create a device for the bilateral discharge of rods, in which it would be possible to control the process of transmitting the workpiece to shape the loading footprint to the supports, while reducing the contact of the workpiece with the half-matrices, which would increase the reliability of the device and its longevity.

The solution consists of a device for refilling
bilateral rods, including a body, in grooves
inclined from which are placed half-open dies with
hollows which, in the closed position thereof, form a
loading footprint and a print job, a
crossbar mounted on a bar controlled and linked to the half-mast
these, discharge punches and a support for parts
to shape, located below the half-matrices, device danc
which according to the invention is provided a trasn mechanism
mission of the workpiece to shape the footprint of loading-at
support, comprising jaws mounted on the cross-member and
kinematically related to said bar, on which are made
two circular shoulders between which said cross
is positioned with a game and so that it can cooperate alternately with each of said shoulders, said clearance between the crossbar and the shoulders being proportional to the stroke of the jaws.

 According to the invention, the jaws are pivotally mounted on the cross member using bent levers.

 The presence, in the device, of a mechanism for transmitting the workpiece to be shaped from the loading impression to the support, kinematically linked to the bar, makes it possible to ensure in synchronism with the displacement of the half-dies the taking of the workpiece, its transfer to the support and the return of the jaws to their initial position.

 The gripping and holding of the workpiece, provided by the device during the opening of the half-dies, increases the reliability of the device, since they exclude the free fall of the workpiece and ensure its displacement in the oriented position. .

In addition, the removal of the part of the loading impression of the half-dies performed by the jaws reduces the duration of the contact between the workpiece brought to the incandescent ~ and the working member. Since this duration is almost half of the duration of the refoulement cycle, such a reduction has a marked influence on
half-matrices.

 The simultaneity of the opening operations of the matrix, the transmission of the workpieces and the evacuation of the shaped parts, in conjunction with the reliability of the device, increases the shaping efficiency by 1.2 to 1.5 times.

The invention will be better understood and other objects, details and advantages thereof will appear better in the light of the explanatory description which follows of various embodiments given solely by way of non-limiting examples, with references to the drawings. non-restrictive rules in which
- Figure 1 shows an overview of a device according to the invention, in longitudinal section;
- Figure 2 shows the section II-II of Figure 1;
- Figure 3 shows the section III-III of Figure 2;
FIG. 4 shows the position of the jaws at the moment when the workpiece is placed on the support;
- Figure 5 shows the position of the jaws at the moment when the workpiece is removed from the support; ;
- Figure 6 illustrates an alternative embodiment of the transmission mechanism of the workpiece, the latter comprising in this case two pairs of jaws.

 The device for the bilateral delivery of rods comprises a body 1, in the inclined grooves 2 of which are placed half-open dies 3, a crossbar 4 mounted on a controlled bar 5 and connected to the half-dies 3, delivery punches 6 (Figure 2) and a support 7 (Figure 1) for the workpieces, arranged below the half-dies 3, in the walls of the body 1.

 The half-matrices 3 (FIG. 3) have recesses 8 and 9 which, in the closed position of the half-matrices 3, respectively form a cavity or cavity 10 and an impression or working cavity 11, the cavity 10 being located at the upper part of the half-dies 3, as shown in Figures 1 to 5.

 The bar 5 is actuated by one. any known control (not shown) and executes an alternating rectilinear motion simultaneously with the crossbar 4, which is connected to the half-matrices in any known manner, for example, as shown in FIGS. 1 to 4, using grooves 12 and guide fingers 13.

 The device according to the invention comprises a mechanism 14 (FIG. 3) that transmits the workpiece to be shaped from the loading footprint 10 to the support 7.

This mechanism comprises pivoting jaws 15 mounted by means of bent levers 16 on the crossmember 4 and kinematically connected to the bar 5. The bent levers 16 are articulated to the crossmember 4 by means of pins 17, their ends 16a. carrying the jaws 15, and their ends 16b being hinged to the controlled bar 5 with the aid of axes 18, which ensures the kinematic connection with said bar 5.

 On the bar 5 are formed two circular shoulders 19 and 20, between which the cross member 4 is placed with a set 21 and so that it can-cooperate alternately with each of these shoulders. For this, the crossbar 4 is mounted on the bar 5 to free adjustment, which allows it to move on the bar 5 within the limits defined by the shoulders 19 and 20.

 The clearance 21 between the crosspiece 4 and the shoulders 19 and 20 is proportional to the stroke of the jaws 15.

If the shaping of the part requires several transfers thereof, the device represented in FIG. 6 is used. This device comprises half-dies 3 with several working impressions 22, each of them, except the last one, also office impression or cavity loading. In this device, the mechanism 14 for transmitting the part comprises two pairs of jaws
23. Each pair of jaws 23 is placed on bars 24 which are arranged in guides 25 mounted in the body 1. The kinematic connection of the jaws 23 with the bar 5 is effected by means of bent levers 26, a connecting rod 27 and a lever 28. The levers 28 are articulated to the crossbar 4.

 The device operates as follows.

 The workpiece 29 (FIG. 3) is placed in the loading footprint 10 on the closed half-dies 3. During the descent of the bar 5 linked to its control (not shown), the levers 16 begin to pivot, which ensures the approximation of the jaws 15, which then slightly lift the workpiece 29 in the footprint 10 half -matrices 3 and keep her in this position. The bar 5 then moves relative to the crossbar 4, thus eliminating the clearance 21 between the shoulder 19 and the crossbar 4, a game whose value is proportional to the (approaching) stroke of the jaws 15.

 The bar 5 continuing its movement, the shoulder 19 acts on the crossbar 4, and the half-matrices 3 move in the grooves 2 of the body 1 together with the jaws 15 holding the workpiece 29.

 At the end of the working stroke of the half-dies 3 (FIG. 4), the part 29 lands on the support 7, while the shaped part (not shown), which was previously in the working footprint 11 , is unloaded.

In this position, the half-dies 3 are open while the jaws 15 remain closed.

 During the return stroke of the bar 5, by its displacement relative to the crossbar 4 of the value of the clearance 21 between the shoulder 20 and the crossbar 4, the levers 16 pivot first and the jaws 15 ' away. Then, after the removal of the game 21, the bar 5 makes up the half-matrices 3.

 During the rise of the half-matrices 3 (FIG. 5), the lower edges of the recesses 9 of the half-matrices 3 arrive at the level of the support and grip the workpiece 29. By approaching, little by little, the matrices 3 bring the piece 29 into the discharge zone.

 In this way, the displacement of the jaws 15 and half-matrices 3 is effected by means of a common control, which increases the operating ability of the entire device, increases its longevity and contributes to the increase. performance.

 The operation of the device shown in FIG. 6 is similar to that just described, this device ensuring the shaping of the parts of the two sides in several transfers, from the impression 22 greater than the lower imprint 22, which is particularly important for operations such as cold-discharge, shock-spinning, metal-removal machining, etc.

Claims (2)

 Device for the bilateral discharge of rods, comprising a body (1) in inclined grooves (2) of which are placed opening half-matrices (3) provided with recesses which> in the closed position thereof, form an imprint loading device (10) and a working footprint 11, a crossbar (4) mounted on a controlled bar (5) and connected to the half-dies (3), delivery dies (6-) and a support (7) for the workpieces, located below the half-dies (3), characterized in that it is equipped with a mechanism (14) for transferring the workpiece from the loading footprint (10) to the support (7) and comprising pivoting jaws (15) mounted on the crossbar (4) and kinematically connected to the bar (5), on which are formed two circular shoulders (19 and 20) between which said crossbar ( 4) is placed with a clearance (21) and so that it can cooperate alternately with each of said shoulder the clearance (21) between the cross member (4) and the shoulders (19 and 20) being "proportional to the stroke of the jaws (15).  2. Device according to claim 1, characterized in that the jaws (15) are pivotally mounted on the cross member (4) by means of bent levers (16).