LU84083A1 - DEVICE FOR ADVANCING BLANKS TO A MATRIX OF A HOT DELIVERY PRESS - Google Patents

Description

-2- B. 75.05¾

Ft - AK

'The invention relates to the field of metalworking by deformation, and in particular relates to the equipment of the presses used for the manufacture of fasteners and, more precisely, the devices for advancing blanks to a matrix of a hot discharge press.

The claimed device is used for the manufacture of fasteners such as bolts, wood screws, dowels, studs, rivets, for example. shot from a bar, one end of which is heated during transport to the die of a press, to temperatures in the region of 1400 ° C.

In these devices for advancing blanks to the die of a hot press, there is a problem of immobilization of the blanks during their transport in the heating zone. The devices which are used at present for immobilizing the blanks in the heating zone are of rather complicated design, do not block the blanks in a sufficiently solid manner in their means of transport, which results in the fall of the blanks from the heating zone and appreciably increases the percentage of discarded parts, since it is impossible to re-use these heated blanks which have fallen out of the heating zone.

A device is known for advancing blanks to the die of a hot discharge press used for the manufacture of fastening elements (cf. SK Kozhevnikov et al., '' Mechanisms' *, M., Machinostroenie , 1976, page 754, FIG. 134) ”comprising, mounted according to a succession of technological operations, a magazine-accumulator of the blanks, a device for loading the blanks, a wheel along the circumference of which are housed for the transport of blanks in their heating zone, a device for blocking the blanks in the housings during their transport in the heating zone, a device for removing blanks from the wheel and a mechanism for advancing the blanks to the press die. The housings of the transport wheel are in the form of grooves made along the periphery of the wheel, each of said grooves being covered externally by a screen pushed by a spring. However, these screens do not securely hold the blanks in these housings. In addition, since the heating of the blanks consists, as a general rule, of induction heating the ends of the blanks to be worked, the blanks are drawn from the housings by the forces of the magnetic field. Deterioration of springs and thin screens by burning under the action of induction heating is also a cause of falling blanks.

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There is also known a device for advancing blanks to the die of a hot discharge press used for the manufacture of fasteners (cf. the hot discharge press BSRV-25 of the Company * 'Kizerling'1 of the Federal Republic of Germany, for automated production lines HRS-25 and TIR-25, used for the manufacture of »railway bolts and thread clamp bolts as well as wood screws), comprising, mounted according to a series of successive technological operations, a store-accumulator of blanks, a device for loading blanks, a wheel kinematically connected to the press control and having, according to its circumference, housings receiving the blanks during their transport in the heating zone formed by a heater mounted on one of the side faces of the wheel, at its upper part, a device for blocking the blanks in the wheel housings during their transport in the heating zone, a device for '' removal nt of the wheel blanks and a mechanism for advancing the blanks to the press die.

In this device, the housings for the blanks are produced in the form of orifices opening into the body of the wheel, orifices whose axes are parallel to the axis of rotation of the wheel. To immobilize the blanks in these wheel housings during their transport in the heating zone, spring-loaded stops are used, each mounted in line with a spur in the side face of the wheel opposite the face where -S 'is installed the heater and each connected to a pneumatic cylinder which, while operating, takes up or releases the blanks by stopping.

The device for loading the blanks into the corresponding housings of the wheel is constituted by the coupling of an intake trough and a pusher of the blanks in the housings of the wheel, produced under

S

form of a pneumatic cylinder.

The device for removing blanks from the wheel is produced in the form of an intake trough and an elector constituted by a pneumatic cylinder.

To ensure coordinated operation of all pneumatic cylinders when the blanks are loaded into the corresponding housings and when they are removed, the wheel must operate in discontinuous mode. Therefore, to block the wheel at the time of stopping after its rotation by one step, there is also provided a centering device produced in the form of a pneumatic cylinder and intended to orient the corresponding housings of the wheel by in relation to the pneumatic cylinders of the pusher and of the blank voter

It was therefore proposed: to develop a device for advancing the blanks to the die of a hot press press used for the manufacture of fasteners, which would be provided with a device for blocking the blanks in the housings of the wheel 4> during their transport in the heating zone, which makes it possible to hold them firmly in the housings of the wheel; thus to raise the reliability of the ·:. .rfj -δίοποί ction of this device; and to simplify its design.

The problem posed is solved using a device for advancing blanks to the die of a hot discharge press used for the manufacture of fasteners comprising, mounted according to a series of successive technological operations, a store-accumulator of blanks, a device for loading the blanks, a wheel kinematically connected to the control of the press, along the circumference of which are formed housings for placing the blanks during their transport in the heating zone formed by a heater mounted on one of the side faces of the wheel, at its upper part, a device for blocking the blanks in the wheel housings during their transport in the heating zone, a device for removing the blanks from the wheel and a mechanism for advancing the blanks to the die of the press, characterized, according to the invention, in that the device for blocking the blanks in the wheel housings during their transpo rt in the heating zone is produced in the form of a magnetic system comprising permanent magnets fixed by homonymous poles to the concave surface of an arcuate plate made of a magnetic conductive material, intended to achieve the summation of the magnetic flux, the other pole of each of said magnets carrying a particular plate made of a magnetic conductive material, to complete the magnetic flux, and also comprising magnetic conductive elements, some of which are fixed on a flat ring secured to the wheel and are each arranged in front of a corresponding housing, while the others are each fixed on the wheel, between a corresponding housing of the wheel and the axis of rotation of the wheel, a magnetic flux summation plate being mounted opposite the heater, on the other side of the wheel, and its arcuate edge being oriented towards the magnetic conductive elements of the flat ring which is located in the heating zone and which is arranged a with spacing from said magnetic conductive elements.

It is desirable that, in the device for advancing blanks to the die of a hot press press according to the invention, the wheel housings are produced in the form of grooves at the periphery of the wheel and that the a device for loading the blanks, mounted on the body of the blank accumulator magazine, a stop whose support surface has a tangent plane common with the surface of the groove when it is in one of the positions, a pushed roller by a spring, intended to apply the blank against a corresponding magnetic conductive element disposed on the flat ring, a lever with two arms at one end of which is mounted a counterweight and at the other end of which is mounted a roller for applying the blanks against a corresponding magnetic conductive element disposed on the wheel.

'It is advantageous that in the device for advancing blanks to the die of a hot press press according to the invention, the device for removing blanks from the wheel comprises a slide whose upper edge meets the generator of the wheel to come into contact with the surface of the groove during the separation of the blank of the magnetic conductive elements, when said blank leaves the heating zone.

It is useful, in the device for advancing blanks to the die of a hot discharge press according to the invention, that a magnetic clamp comprising two plates of magnetic conductive material, a magnet be mounted above the slide. permanent disposed between said plates and a plate of non-magnetic material having a beveled edge parallel to the slide, and fixed to the surface of the magnet oriented towards the slide.

This embodiment of the device for advancing blanks to the die of a hot delivery press used for the manufacture of fasteners makes it possible, thanks to the application of the magnetic system, to reliably transport the blanks in the heating zone, i.e. almost completely eliminating the fall of the blanks from the wheel housings during their transport in the heating zone, the device thereby enabling the percentage of parts to be reduced of discarded fasteners.

In addition, in comparison with the devices in use at present, this device is of simple design, it eliminates dynamic loads on the blanks, it reduces the time necessary for the displacement of a blank and makes it possible to simplify the design of the -Q- device for loading blanks into the wheel housings and the device for removing blanks from the wheel, the operation of these devices no longer requiring discontinuous movement of the wheel.

This embodiment of the above-mentioned devices; The increased reliability of the equipment by at least 25% while at the same time increasing its efficiency.

It should also be noted that the mass and the overall size of the whole of the device for advancing blanks to a die of a hot press are also reduced.

The invention will be better understood and other objects, details and advantages thereof will appear more clearly in the light of the explanatory description which will follow of different embodiments given solely by way of nonlimiting examples, with reference to non-limiting drawings attached to this specification and in which: - Figure 1 schematically shows an overview of a device for advancing blanks to a die of a hot press press (in section partial), according to the invention; - Figure 2 is a section on an enlarged scale, along the line II-II of Figure 1, according to the invention; - Figure 3 is a section, on an enlarged scale, along the line III-III of Figure 2, according to the invention; - Figure 4 is a section, on an enlarged scale, along the line IV-IV of Figure 2, according to the invention; FIG. 5 is a view from above, on an enlarged scale, of the device for loading the blanks, according to the invention; - Figure 6 is a top view, on an enlarged scale, of a device for removing the blanks t from a wheel and a mechanism for advancing blanks to the die of the press, according to the invention.

The device for advancing the blanks to the die of a hot discharge press used for the manufacture of fasteners comprises, mounted according to a series of successive technological operations, an accumulator magazine 1 (FIG. 1) of the blanks, a loading device 2, a wheel 3 for transporting the blanks in the heating zone, a device 4 for locking the blanks in the wheel housings during their transport in the heating zone, a device 5 for removing the blanks from the wheel and a mechanism 6 for advancing the blanks to the press die.

In the body 7 of the accumulator magazine 1 produced in a manner analogous to an accumulator magazine of a known positive device, an inclined labyrinth 8 has been provided, according to which the blanks 9 move towards the wheel 3.

The labyrinth 8 serves at the same time to accumulate the blanks 9, the maximum number and the minimum number of which are controlled by inertia sensors 10 produced according to a known design. At the entrance to the labyrinth 8, a pivoting lever 12 is installed on an axis 11 ·! -11-

The loading device 2 is constituted by a stop 13, a roller 14 and a lever with two arms 15 "fixed on an axis 16, mounted on the body 8 of the accumulator magazine 1.

The wheel 3 for transporting the blanks 9 through the heating zone comprises housings 17 where the blanks are housed. These housings 17 are formed regularly along the circumference, in the form of grooves at the periphery of the wheel 3, parallel to the axis of rotation of the wheel 3. In the area "a" (shown in parenthesis), l 'blank 9 is heated using an induction heater (not shown) similar to the heater used in a known device, which is installed at the top of the wheel 3, and which forms the heating zone' 'a * 'blanks 9. Between the heater and the wheel 3 is rigidly fixed on its axis a disc 16 at the upper part of which are provided, opposite the grooves 17 "of the recesses 19 of profile similar to that of the grooves 17. The wheel 3 is rotated by a press control, comprising an electric motor 20; the latter is kinematically connected, on the one hand, via a shaft 21 and a worm gear reducer 22, to the axle 23 of the wheel 3. On the other hand, the motor 20 is kinematically connected, by a worm gear reducer 24, to a rotary table 25 of the press die. The kinematic chain is conventionally designated by arrows.

i -12-

During the rotation of the wheel 3, when each housing 17 is in one of the positions, the bearing surface 26 of the stop 13 has a tangent plane common with the surface of the corresponding housing 17. This is how the 'is ensured a strictly determined blocking of the blanks 9 with respect to the corresponding housings 17 when the blanks 9 are loaded into the housings, 17 of the wheel 3. It is advantageous that the bearing surface 26 is made curvilinear, with a radius curvature equal to the distance between the axis of the wheel 3 and the housing 17.

The device for removing blanks from the wheel comprises a slide 27, the upper edge of which meets the generator of the wheel 3 and connects to the surface of each housing 17 located at the level of the slide 27 in one of the positions, at when it leaves the heating zone '' a ''. Above the slide 27 is fixed a magnetic clamp of the device 5, intended to remove the blanks from the wheel. The magnetic clamp is formed by two plates 28 of magnetic conductive material, for example of a magnetic conductive electrotechnical steel, mounted above the slide 27 and between which is fixed a permanent magnet 29 î a plate 30 of non-magnetic material is fixed on its surface oriented towards the slide 27, parallel to the plates 28. This plate is, for example, made of non-magnetic steel.

One edge of the plate 30, parallel to the slide 27, is bevelled.

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The mechanism 6 for advancing the blanks to the die of a press can be produced in a similar manner to the known device. In the claimed variant, it comprises a roller conveyor 31, inclined guides 32 with an intake trough which directs the blanks 9 relative to the rotary table 25 of the die. A separator 35, intended for the discontinuous advancement of the blanks 9 towards the die, is mounted upstream of the trough 33 on an axis 34. In FIG. 1, the arrows indicate the direction of movement of the blanks 9 which are shown under shaped like round bars.

The device 4 for blocking the blanks in the wheel housings during their transport in the heating zone '' a '' is constituted by a magnetic system comprising permanent magnets 36 (Figures 2,3) fixed by homonymous poles to the concave surface of an arcuate plate 37, made of a magnetic conductive material, for example an electrotechnical steel, for summing the magnetic flux. A particular plate 38 of magnetic conductive material is fixed to the other pole of each of the permanent magnets 36. As magnetic conductive material, it is possible to use the magnetic electrotechnical steel used for the manufacture of the plate 37.

This part of the magnetic system, comprising the plate 37 * the permanent magnets 36 and the plates 38 mounted using bolts 39 (Figure 2), 40 and 41, on a plate 42, is permanently mounted, to the part upper of wheel 3, on the opposite side from where the heater is installed.

The other part of the magnetic system of the device * 4 includes magnetic conductive elements 43, 44 (Figures 2,4). The elements 43 are fixed to a flat ring 45 secured to the wheel 3. The other magnetic conductive elements 44 are fixed to the wheel 3, each between a corresponding housing 17 of the wheel 3 and the axis of rotation of the wheel 3. The magnetic conductive elements 43, the number of which is equal to the number of housings 17 in the wheel 3, are produced in the form of cylinders made of magnetic conductive electrotechnical steel. Their diameter is approximately equal to the diameter of the blanks 9, mounted on the press in orifices made in the flat ring 45, along its circumference. The ring 45 is made integral, for example by welding, with the wheel 3, so that the magnetic conductive elements are each arranged opposite a corresponding housing 17.

f The magnetic conductive elements 44 are in the form of flat rectangular plates made of magnetic conductive electrotechnical steel. The number of magnetic conductive elements 44 is also equal to the number of housings 17 provided in the wheel 3, and each of them is arranged radially on the wheel 3 and fixed so that one of its edges is located at the housing 17.

The plate 37 intended for the summation of the magnetic flux is mounted so that its arcuate edge is oriented towards the magnetic conductive elements 43 of the flat ring 45 located in the heating zone. It is arranged with a spacing "b" relative to said magnetic conductive elements 4¾. The plates 58 of the magnetic system are mounted with a spacing "c" relative to the magnetic conductive elements 44.

I The values of these spacings "b" and "c" (figure 2) as well as the length of the arc of the plate 37 and the number of permanent magnets, are chosen so that the blank 9 is maintained firmly in the heating zone, and the action of the magnetic system weakens at the exit from the heating zone `` a '' (figure 1) so that the blank 9 separates freely from the magnetic conducting elements 43 ( Figure 2) and 44 under the action of its own weight, and falls from the housing 17.

FIG. 5 illustrates a method of advancing a blank 9 from a feed conveyor 46, using a lever 12 pushed by a spring 47, through the accumulator magazine 1, towards a housing 17 of the wheel 3. The roller 14 of the loading device 2 of the blanks is mounted at a distance which separates it from the magnetic conductive element 43, not less than a length of the blank 9, and is used to apply the blank 9 against the 'magnetic conductive element 43. For this purpose, the roller 14 is fixed on a support 48 by means of a spring 49 which allows said roller 14 to move along the axis of the housing 17.

The two-arm lever 15 of the loading device 2 for the blanks 9 is intended to apply the blank 9 against the magnetic conductive elements 44. One end of this lever carries a counterweight 50 and the other a roller 51.

FIG. 6 shows a process for transporting a blank 9 from the wheel 3 to the turntable 25 of the press die. For putting the blank 9 into a matrix, the mechanism 7 is also provided with a pusher 53 fixed on a slide 54 of the press, coaxially with the orifice 55 of the matrix. In the event of discontinuous advancement of the blanks 9 into the intake gauge 33, a stop 56 fitted with flanges 57 and a separator 35 of the blanks 9 is mounted on the guides 32.

The claimed device for advancing the blanks to the die of a hot press press operates as follows.

A blank 9 (Figures 1.5) arriving from a conveyor 46, strikes at its front end one of the arms of the lever 12 and begins to slide along its plane in a labyrinth 8 of the accumulator magazine 1. Under the effect of the force of inertia of the blank 9, the lever 12 rotates about the axis 11 and strikes with its other arm the rear end of the blank 9 by making it move e following the labyrinth 8 of the accumulator magazine 1 , where its axis is oriented perpendicular to the plane of the wheel 3.

Then, the spring 47 returns the lever 12 to the starting position. Following the inclined labyrinth 8, the blank 9 arrives at the wheel 3 and enters the loading device 2 for the blanks. The maximum number and the minimum number of blanks 9 are controlled by inertia sensors 10 in the accumulator magazine 1, activating or at rest the advance control of the blanks 9 towards the feed conveyor 46. When a blank 9 engages in the housing 17 of the wheel 3, it rests on a stop 13 fixed to the body 7 of the accumulator magazine 1 on the side of the heater, which eliminates the warping of the blank 9 and prevents the blank 9 to fall from the accumulator magazine 1 and from the wheel 3. Driven by the wheel 3 set in rotation movement by means of a kinematic chain from one of the shafts 21, in continuous rotation, of the press, the blank 9 begins to move together with this wheel, towards the heating zone "a". At this moment, it slides along the stop 13 whose bearing surface 26, in one of the positions of a corresponding housing 17, has a common tangent plane with the surface of this housing 17.

During its subsequent movement, the blank 9 arrives in the area of action of the blocking device 4 of the blanks in the wheel housings, and it comes into contact with the rollers 14 and 51 applying the blanks 9 against a magnetic conductive element. corresponding 43 and 44. Under the action of the counterweight 50 of the two-arm lever 15, the roller 51 positions a blank 9 in the housing 17, perpendicular to the plane of the wheel 3, and applies it to the magnetic conductive element 44 When the blank 9 has left the area of action of the roller 51, the other roller 14 enters into cooperation with the blank by applying it, under the action of the spring 49, in the axial direction, towards the magnetic conducting element 43 of the flat ring 45 (FIG. 2). The blank thus positioned 9 is now held firmly by the forces of the magnetic field. In this case, the main magnetic flux of the magnetic field is transmitted from a pMe of the permanent magnets 36 via the plate 37 acting as a summator of magnetic flux, from the air gap ** b '* between the plate 37 and the magnetic conductive element 43, the magnetic conductive element 43, the blank 9, the magnetic conductive element 44, the air gap '' c '* between the magnetic conductive element 44 and the magnetic conductive plate 38, magnetic conductive plates 38, at the other poles of the same magnets 36. In order to make maximum use of the force characteristics of the magnetic system, the air gap "b '* is made as small as possible .

During the rotation of the wheel 3, the blanks 9 held in the wheel pass through the heater (not shown in the figure) where their free end is heated and they approach the device 5 for removing the blanks from the wheel 3. By the forces of the magnetic field of the magnetic clamp, the blank 9 is attracted and held by it.

The wheel 3 rotates continuously and pushes the blank 9 along the surface of the magnetic conductive plates 28 of the magnetic clamp. The blank then rolls along the surface of the magnetic conductive plates 28 and leaves the housing 17 of the wheel 3.

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During the subsequent movement of the wheel 3 carrying the blank 9, the latter comes into contact with the plate 30 of non-magnetic material. Consequently, the interaction forces of the magnetic conductive plates 28 with the blank 9 weaken and the blank separates from the magnetic clamp; it rolls out of the housing 17 of the wheel 5 and falls on the slide 27 which brings it to the press die using a mechanism 6 for advancing the blanks to the die of the "press.

The device described above for advancing blanks towards the die of the press, makes it possible to reduce the number of fasteners manufactured to be discarded, and to increase the output of the press thanks to the increase in the service life of the parts and components of the kinematic chain of the press control, due to the fact that the discontinuous movement in the feed device for blanks has been eliminated and its inert masses have been reduced, in particular comparison with a known device.

Claims (3)

1, - Device for advancing blanks to the die of a hot press press used for the manufacture of fasteners, comprising, mounted according to a series of successive technological operations, a storage accumulator of blanks, a device for loading the blanks, a wheel kinematically connected to the control of the press, housings being formed along the circumference of said wheel to place the blanks therefor for transport in the heating zone formed by a heater installed on the one of the faces of the wheel, at its upper part, a device for blocking the blanks in the wheel housings during their transport in the heating zone, a device for removing the blanks from the wheel and a mechanism for advancing the blanks to the die of the press, characterized in that the device (4) for blocking the blanks in the wheel housings during their transport in the heating zone, is produced in the form of a sy magnetic system comprising permanent magnets (36), fixed by homonymous poles, to the concave surface of an arcuate plate (37) made of a magnetic conductive material and intended to effect the summation of the magnetic flux, while at the the other pole of each of said magnets is fixed a particular plate (38) of magnetic conductive material, used to form the magnetic flux, magnetic conductive elements (43 and 44), some of which (43) are fixed on a flat ring ( 45) secured to the wheel (3) and are arranged each in front of a corresponding housing (17), while the others (44) are each fixed on the wheel (3), between a housing (17) corresponding wheel (3) and 1 * axis of rotation of the wheel (3), a plate (30), intended for the summation of the magnetic flux, being mounted opposite the heater, on the other side of the wheel ( 3), and its arcuate edge being oriented towards the magnetic conducting elements (43) of the flat ring (45) which is located in the zo heating, and which is arranged with spacing relative to said magnetic conductive elements (43). 2.- device for advancing blanks to the die of a hot press, according to claim 1, characterized in that the housings (17) of the wheel (3) are produced in the form of grooves made at the periphery of the wheel (3), and in that the device for loading the blanks comprises, mounted on the body (8) of the accumulator magazine (1), a stop (13) whose bearing surface (26) has a tangent plane common with the surface of the groove when it is in one of the positions, a roller (14) pushed by a spring, intended to apply the blank (9) against a corresponding magnetic conductive element (43), arranged on the flat ring (45), a lever with two arms (15) at one end of which is mounted a counterweight (50), and at the other end of which is mounted a roller (51) for applying the blanks ( 9) against a corresponding magnetic conductive element (44) disposed on the wheel. -22- 3, - Device for advancing blanks to the die of a hot press, according to claim 2, characterized in that the device (5) for removing blanks from the wheel comprises a slide (27) whose upper edge meets the generator of the wheel (3) to come into contact with the surface of the groove during the separation of the blank (9) from the magnetic conductive elements (43,44), at the moment when said blank leaves the heating zone. 4. Device for advancing blanks to the die of a hot press, according to claim 3, characterized in that above the slide (27) is mounted a magnetic clamp comprising two plates (28) of magnetic conductive material, a permanent magnet (29) disposed between said plates and a plate (30) of non-magnetic material, having a beveled edge parallel to the slide and fixed to the surface of the magnet (29) oriented towards the slide ( 27). I ^ dd dd