DE2204541A1 - TRANSFER DEVICE FOR A FORGING PRESS - Google Patents

Description

G 47 993

The Ajax Manufacturing Company, 1441 Chardon Road North, Cleveland , Ohio 44117, USA

Transfer device for a forging press

The invention relates to a device for transferring warm blanks or blocks between the dies a vertical forging press.

Known transfer devices for vertical forging presses are for example in US Pat. No. 3,180,123 (KuIl), 3,079,817 (Sanford), 1,426,039 (Candee) and 3,422 (Grombka et al). These known transfer devices are quite complex and elongate through relatively narrow windows in the press frame, which limits the movement of the transfer fingers. There one Forging press executes relatively violent impact movements and the impacts or vibrations on the foundation of the press transferred, it is with repeated use of the transfer

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Guide device possible that it loses its alignment. This can affect the quality of the workpiece produced by the forging process and also there is a risk of excessive wear and tear or even breakage of the tool.

It is therefore the object of the invention to provide a transfer device that is also suitable for large forging presses in which a permanent alignment of all elements is guaranteed. The transfer device should have an independent drive and are able to be to trigger the work rhythm of the press when the workpiece is in a suitable position and the dies are removed from the elements of the transfer device.

For this purpose it is proposed according to the invention that a pair of pivoting levers be attached to each side of the press, that in front of and behind the dies a transfer carrier extending through the press is arranged and attached to the free ends opposite levers of each pair of pivoting levers is mounted so as to be longitudinally displaceable and that a the two levers of each pair of pivoting levers for opening and closing the transfer carrier pivot in opposite directions drive and the two transfer carriers at the same time Transfer drive that moves back and forth in the longitudinal direction are provided for transferring the workpieces. The main shaft belonging to the transfer device and the associated ones Transfer elements are connected directly to the press.

Preferably, the arrangement is such that even a small angular movement of the main arms will push the transfer carrier lifts, with the transfer carriers being supported by the levers on the main arms. Even a slight angular movement the pivot lever opens and closes the transfer e.

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In a preferred embodiment, the transfer device spring-loaded fingers attached to the two transfer supports, with which the workpiece is grasped and is transferred from one to the other die.

The transfer device according to the invention has a relative simple construction and can be used in conjunction with automatic feeders.

The invention is explained in more detail below with reference to exemplary embodiments shown in the drawing. In the Drawing show:

Pig. 1 shows a side view of a forging press with

an embodiment of the new transfer device;

Fig. 2 is a partial front view with broken away and sectioned parts according to the line 2-2 of Fig. 1;

Fig. 3 shows a horizontal section through the press approximately along line 3-3 of Figure 2;

4 shows enlarged partial sections through the dies up to 7 to show the transfer carrier movement;

Fig. 8 is a side view, on a somewhat enlarged scale, of another embodiment of the invention;

Figure 9 is a front view of the embodiment of Figure 8 taken along line 9-9; and

Figure 10 is a timing diagram of the press and transfer device operation.

As can be seen from FIGS. 1, 2 and 3, the press has an upright, fixed, one-piece steel frame 11 with four massive pillars 12, 13, 14 and 15 on. The pillars form side windows 16 and 17 in the frame.

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A rear housing 20 with one-piece support beams 21 and 22 extending over the entire height is fixed to the main frame 11 connected, with a countershaft 23 being rotatably mounted in the support beams »For smaller press designs the rear housing 20 can be designed in one piece with the main frame 11 as a single casting,

Aa the end of the countershaft visible in FIG. 1 is a Flywheel 24 attached, which is driven by several V-belts 25 from the V-belt pulley 26 of a motor 27. The motor 27 is mounted on an adjustable bracket 28 supported.

On the opposite end of the countershaft 23 sits a pinion 30, which drives a drive wheel 31, which has a directly acting compressed air coupling 33 is connected to an eccentric shaft 32. On the end of the main eccentric shaft visible in FIG. 1 32 a multi-articulated shoe brake 35 is attached, which are ventilated via a direct-acting compressed air cylinder 36 and can be attracted by a relatively strong spring 37.

As can be seen in Figure 2, the main eccentric shaft is over a bear (pitman) 39 is connected to a press ram 38. The main stamp, which is the upper clamping holder for the Upper die and the bear-and-tenon connection is indicated by suitable guide pieces and shims, which are shown at 40 are and are held in place by suitable strong cap nuts 41.

7 is briefly discussed below: From this figure it can be seen that the upper dies 43 of clamping holders 44 can be held in position, a cross wedge 45 being provided for die adjustment. The lower dies 46 are fastened to the die seat surfaces of the main frame with the aid of clamping brackets 47, the clamping brackets 47 from

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Fixing screws 48 are held in place. An ejector in the punch is actuated by the bear, while ejector mandrels 50 and 51, which are effective from the bottom, from a cam on the main eccentric shaft via not shown, conventional arms and levers are operated.

As can be seen from Fig. 2, four groups of dies, which are provided with the reference numerals 53, 54, 55 and 56, respectively, may be provided. These dies can be based on their function are referred to as pre-forging, form forging, finish forging or abrading dies. Since the workpiece is normally from is moved left to right (Fig. 2) by the press during transfer, is an input or receiving station 57 and an exit or delivery station 58 is provided.

A horizontally extending feed arm 60 supported on parallel pivot levers 61 and 62 carries one on its end at 63 designated heated block or a heated blank. When the feed arm 60 by pivoting the pivot arms 61 and 62 is advanced, the blank is moved to the receiving station 57, from where it is moved with the aid of the transfer device is moved through the press.

IMPLEMENTATION PROVISION ^

From Fig. 3 it can be seen that the transfer device has supports 70 and 71 which are in front of and behind the forging dies are arranged. The carriers each have longitudinal extension pieces 72 and 73, which are attached to the main or Central portion of the beams are connected by connections 74 and 75, respectively. On the transfer carriers 70 and 71 are after inwardly facing groups of transfer fingers 77 and 78 attached. As can be seen in Figure 3, there are five sets of opposing transfer fingers attached to the carriers; the training of the evacuation or Gripper finger can change from left to right, though

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the shape of the workpiece 63 changes due to the forging process.

Transfer carriers 70 and 71 extend through lateral windows 16 and 17 of the press frame and are relatively shorter outside the window 16 in the free ends Levers or arms 80 and 81 supported, the latter being hinged to a longer arm at 83 and 84, respectively.

The other end of the beams 70 and 71 extend through the window 17 in the press frame; relatively short lever or Swivel arms 85 and 86, which are pivotably connected to a longer swivel arm 87, carry them with their free ends Carrier. The pivot levers 85 and 86 are designed corresponding to the pivot levers 80 and 81 and are on them associated longer main arms attached in the same way. The free or distal end of each lever is quite wide, in the illustrated embodiment over 50 cm in order to be able to support the carrier in a suitable manner. The swing levers are fork-shaped at their upper ends for a pivot connection with the longer arm and a sliding connection to be able to produce between the individual levers of each pair. The fork of the rear pivot lever 80 and 85 carries a stop piece 88 which is adjustable with the nose of mounted on the tops of the main arms 82 and 87 Stop screws 89 can come into contact. These stops enable the gripping position of the transfer fingers to be adjusted, since the carrier can only be moved into an end position limited by the stops.

The fork of the rear pivot lever also forms a connection point 90 for air pressure springs 91, which also connected to the top of main arms 82 and 87 at 92. The connection between the pivot levers each pair is formed by a bolt 93. This BoI

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zen 93 formed. These bolts are in sleeves 94 in the front levers pivoted and with a square section 95 provided, which sits in bronze guides 96, the Bronze guides 96 are mounted in slots 97 in the rear levers. The front levers of each pair of pivoting levers are with forwardly protruding arm portions 98 on the Outside of the main swing arms 82 and 8? Mistake. These arm sections are connected to adjustable bumpers or connectors 100 at 101, the opposite end of which is connected at 102 to rocker arm 103 articulated at 104. These rocker arms have a fork-shaped section on, which carries a cam follower 105 "

The transfer carriers are arranged horizontally in the free ends of the short pivoting levers and open Rolling bearing rollers on the bottom and on the outside at 110 and

111 stored to carry the gripping loads. Bronze wear plates can be found on the top and on the inside

112 and 113 use to maintain appropriate play. Bellows covers can be attached to the beams and levers to prevent debris from entering the storage areas to exclude.

The vertical movement of the two carriers 70 and 71 is through caused the two long, essentially horizontally extending pivot arms 82 and 87, one of which in each case is hinged on each side of the press near the back of the press at points 115 and 116, respectively. The swivel arms run slightly curved from their coaxial articulation points on the back of the press to the front of the press, and that front or free end of each pivot arm is connected at 117 to an adjustable-length rod 11b, the lower End is fork-shaped and has a cam follower 119 carries. A rocker arm 120 is hinged at 104 and has a fork connection with the lower end of the rod

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to put the cam follower in the correct position keep.

As can be seen from Figs. 2 and 3, the transfer movement the carrier caused by a pivot lever 122, the pivot axis of which is provided at 123, the associated Bearing shaft in mounted on the top of a stator 126 pillow block bearings 124 and 125 is arranged. The stand has two projections 127 to which the closed end of an air pressure spring 128 is connected at 129. The piston rod the air pressure spring is with the lower end of the pivot lever 122 against a transfer cam or a Cam disc 131 preloaded.

The upper end of the lever 122 is symmetrical with one on both sides formed connector 133 provided at each end via connecting rods 134 and 135 to the transfer beams 70 and 71, respectively, with self-aligning pivot bearings 136 for adaptation to various movements are provided between the connecting rods and the associated transfer beams.

The drive for the various cam elements that actuate the transfer device is derived from a geared motor unit 137, which has a cam limit switch that is effective at the end of a transfer cycle when the appropriate position is reached and after the transfer elements have been removed from the forging press to set in motion. The output shaft of the motor unit is connected to the main camshaft 130 which is supported in suitable bearings 139 and 140 on the front of the press. The first cam disk on the shaft 138 is the gripper cam or cam disk 141, which actuates the cam follower member 105 and opens and closes the relatively short pivot levers SO and u1. The second cam or cam 142 acts on the follower element 119> the main lever

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pivoted to raise or lower the transfer carrier. The cam member 143 has the same cam track as the cam plate 142 and raises and lowers the main lever 87; the cam member 144 has the same cam track as the cam disc 141 and actuates the pivot arms 85 and 86 simultaneously with the Swivel levers 80 and 81. The transfer cam disc 131 is actuated by the camshaft 138 via an angular gear 145. A chain drive 146 actuates the cam disk 147 via an angular gear 148; the cam plate 147 moves the pivot arm 61 as a drive for the feed arm 60 in synchronism with the transfer device.

It can be seen that cam followers 105 are held in abutment with cams 141 and 144 by air springs 91 will. The opening movement of the fingers is triggered by the cam disc immediately raising the cam followers and the closing movement caused by the pressure of the air springs. This arrangement ensures maximum security by inevitable, d. H. cam operated finger opening and cam operated but air pressure operated Detecting the workpieces. This feature also applies to the transfer process in which the air spring 128 is the cam follower 130 on the associated cam disc 131 holds. The transfer carriers are under the direct influence of the cam moved from right to left (Fig. 2), while the transfer carrier in opposite directions, so from left to right for transferring the workpieces under the influence of those holding the cam follower 130 on the associated cam Air spring 128 are moved. This ensures optimum safety during the transfer process. The cam followers 119 are held in contact with the cam disks 142 and 143 solely by the weight of the main arms 82 and 87.

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Embodiment according to FIGS. 8 and 9

In the embodiment shown in FIGS. 8 and 9, the main operating arms 150 and 151 are on the front of the press frame 11 is pivotably mounted. Each arm is attached to a hollow shaft stub 152 or 153, the is rotatably mounted in pillow blocks 154 and 155, pivot arms 156 and 157 are attached to the hollow shaft stubs the free ends of which cam followers 158 and 159 are attached.

The hollow shafts 152 and 153 are thinner shafts 160 and 161 carried out, which are also in pillow block bearings 162 and 163 are stored. Pivot arms 164 and 165, respectively, are attached to the inboard ends of the shafts and carry cam followers 166 and 167, respectively. Rocker arms 168 and 169 are attached to the outer ends of the shafts. The rocker arms are Connected via linkage 170 to arms 171 of the front, relatively short pivoting lever 172, which is attached to the main operating arms are hinged at 173. The front pivot levers 172 are connected to the rear pivot levers 174 via segment gears 175 and 176 connected in such a way that when the front lever is pivoted in the counterclockwise direction shown in FIG the rear levers are pivoted at the same time in a clockwise direction about their pivot point 177 and vice versa. The transfer supports 178 and 179 are in the free ends of the shorter pivot levers 172 and 174 in the same manner displaceably mounted like the supports 70 and 71 in the embodiment according to FIG. 3.

The main camshaft 180 is also mounted on the front of the press and is driven by a sprocket 181 from a gear motor in the manner already described driven. The camshaft is rotatably mounted in pillow blocks 182, 183, 184 and 185, which are located on the front of the press

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are appropriate. A cam disk 1b6 is in contact with the cam follower 159, while the cam follower 167 is in contact with the cam disk 187. A cam curve 1ÖÖ interacts with the cam follower 166, while the cam follower 158 is held in contact with the cam disk 189.

In this embodiment, the main arms run in the same way as in the previously described embodiment, near the tops of those provided in the sides of the press Windows, with the beams arranged in front of and behind the dies. The weight of the swing arms supports the cam followers abut the associated cams, with cams 186 and 189 lifting arms 150 and 151 and lower while the cam disks 188 and 187 the gripper fingers open and close. The transfer carriers can be used for transfer in the same or a similar manner as in be shifted to the embodiment described above.

Operating mode

4 to 7 and 10, initially Pig. 10, referred to. In Pig. 10 is a timing diagram shown, which makes the operation of the press, the transfer device and the feed device clear. While two work cycles of the press and the transfer device, the feeder only performs one work cycle. Therefore a workpiece is in every other position in Pig. 2. When using warm workpieces, this prevents a Overheating of the dies. At the start of the operating cycle, the transfer device actuates the press, whereupon the Preüue in Pig. 10 with 200 designated hub executes. At the same time, the carriers held in the open position are returned in the manner shown by curve 201.

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220A5A 1

When the horizontal return of the carriers is complete, the fingers close in that represented by curve 202 Way. The closing movement of the fingers begins after the press has completed a little more than half of its return stroke Has. Immediately before the end of the gripping movement according to curve 202, the carriers begin to move through the Curve section 203 shown way to lift. At this point, the closing fingers take hold of the pickup station no workpiece because the feed device is withdrawn to receive another blank. Direct after completion of the lifting movement 203 of the carrier, the transfer movement indicated by the curved section 204 begins At the same time, the feed device begins its advance, represented by the curved section 205, to a warm one Block to provide on the receiving parts. To Completion of the horizontal transfer movement 204, the carriers are shown in the curve section 206 Wise lowered and after completion of this operating phase, the fingers in the indicated by the curve section 207 Way open.

At this point, with the transfer fingers removed from the dies, the press will correspond to the curve portion 208 actuated again. At the same time, the beams are returned horizontally, as is done through the curve section 201A is shown. The transfer cycle becomes natural in which is repeated by the curve sections 20IA to 204A, 206A and 207A. In this cycle they grasp each other during the section 202A closing fingers on the Aufnähmest ation a warm blank because the feeding device in the meantime such a part has been deposited at the receiving station Has. Immediately after the end of the lifting movement of the carrier in accordance with the curve section 203A, the feeding device begins to withdraw according to the curve section 2Oy.

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In the illustration of FIG. 4, the transfer carriers are moving 70 and 71 in their gripping position (curve 202 or 202A), and it can be seen that the forging F has been raised from the ejector mandrels 50 and 51 by about 1.7 cm. Fig. 5 shows the gripping position of the transfer carrier. In the representation 6, the transfer carriers are raised and move the forging F at a distance from the lower die 46 to the next Swivel office. In Fig. 7, the transfer carriers have lowered the forging F onto the next die and have been withdrawn according to the curve section 207 in Fig. 10, the ram has reached the end of its stroke and the carriers are returned to carry out the next transfer cycle.

From the above description it can be seen that the new transfer device for forging presses works continuously and the forging press starts moving when the Workpieces are in a suitable position and the dies are at a distance from all transfer elements. All movements the transfer vehicle will be carried out by someone outside the Press attached device controlled, and the carriers, one of which is arranged in front of and one behind the dies run horizontally through each window of the press.

The opening and closing movements of the transfer carriers are caused by two cooperating pairs of pivot levers, one pair on each side of the Press is arranged. These pivot levers are hinged near the top of the press window, with a slight angular movement this lever to open or close the transfer carrier leads. The pivot points of the levers are chosen so that the path of movement in which the fingers are with the Forgings are in contact, an approximately parallel to the horizontal plane of the fingers and the forging running Ridge section is. The opening movement of the fingers

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an active lifting of the Cam followers achieved by the associated cam disks, while the gripping movement is caused by a lowering of the cam followers on the associated cam disks is, the cam followers preferably held by pneumatic springs 91 on the associated cam curves will.

The vertical movement of the transfer fingers is controlled by the two longer main levers, one of which is located on each side of the press. These levers are hinged and extenders in the first described embodiment on the back of the press and in the alternative embodiment on the front of the press near the tops of the press windows so that the transfer fingers can be properly held. In the embodiment described first, the amount for lifting the forging by, for example, 2.5 to 1.3 cm required angular movement of the main levers for the transfer approximately 1 to 1/4 °.

The levers and air pressure springs causing the horizontal transfer movement are arranged so that the transfer carriers under positive cam drive during their free return movement and for transferring the forgings under cam-controlled air pressure drive. This ensures the highest level of safety during the transfer.

The transfer device has an independent drive and is actuated on the basis of the synchronism described above the press at the appropriate time during the transfer cycle. The transfer device can of course work even without confirmation of the press motor. The main camshaft 13B, like the pivot bearing 116, is soft

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ensure the precise alignment of the transfer agencies, connected directly to the press, causing misalignment of the transfer elements due to possible press movements on the basis of which they are eliminated.

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Claims (3)

- 16 - Patent claims Device for transferring raw or forgings between the dies of a vertical forging press, characterized in that a pair of pivoting levers (80, Ö1 and 85, SS) are attached to each side of the press (10), so that in front of and behind the dies (43, 46) each has a transfer carrier (70, 71) extending through the press (10) and is mounted longitudinally displaceably at the free ends of opposing levers of each pair of pivoting levers (80, 81 and 85, 86) and that one of the two levers of each pair of pivoting levers swivel drive (141, 144, 100. 2. Apparatus according to claim 1, characterized in that the pivot lever pairs (80, 81, 85, 86) on the outside of the press (10) are held pivotably by a vertically movable bearing device (82 ... 8 87). 3. Apparatus according to claim 2, characterized in that the storage device is a pair of coaxially mounted, relatively long pivot arms (82, 8-7? 150, 151), of which one on each side of the press (10) is hinged. 4. Apparatus according to claim 3, characterized in that the pivot arms (82, 87) on the back of the press frame (11) are articulated and that a cam drive (142, is attached to the front of the press, with which the free ends of the pivot arms (82, 87) can be raised and lowered. 309810/0585 5. Apparatus according to claim 3, characterized in that the pivot arms are articulated at one end of the press (10) and can be actuated by a cam drive attached to the other end of the press. 6. Apparatus according to claim 3, characterized in that the pivot arms (150, 151) coaxially at the front of the Press are articulated and that a cam drive (186, 189) is attached to the front of the press (10), the V. pivoting of the swivel arms while raising and lowering the carrier (178, 179) is effective (Fig. 8, 9). 7. Apparatus according to claim 3, characterized in that the pivot arms 150, 151 are pivotally mounted on the front of the press (10) and extend over in the sides of the Windows (16, 17) arranged in the press extend, the pairs of pivoting levers (172, 174) on the pivoting arms (150, 151) are arranged hanging. 8. Apparatus according to claim 7 »characterized in that Each pivot arm (150, 151) is connected to a remote actuating arm (156, 157) which is a cam follower (158, 159) and that on the front of the press (10) with the cam followers cooperating cam disks (186, 189) are arranged. 9. Apparatus according to claim 8, characterized in that with one arm (171, 172) of each pair of pivoting levers (172, 174) a push rod (170) is articulated, which is used to open and close the transfer carriers (178, 179) by a cam drive (187, 18ö) can be moved. 10. Apparatus according to claim 9, characterized in that, the push rod (170) with a crankshaft (160, 161) axially offset crank arms (164, 168, 165, 169) connected 309810/0585 - 1Ö - is, wherein the crankshaft extends coaxially through the pivot axis the pivot arms extends. 11. The device according to claim 10, characterized in that the pivot lever (172, 174) through each pivot lever pair a segment gear (175, 176) are coupled to one another so that they execute a movement in opposite directions. 12. The device according to claim 3 or 4, characterized in that that the cam drive (142, 143) is attached to the press near the press base and that length-adjustable rods which carry cam follower members (119) at one end, to the free ends of the two main pivot arms (Ö2, 07) are articulated, the cam follower members under the weight of the pivot arms (02, Ö7) on which as a cam disk trained cam drive (142, 143) are held in abutment. 13. The apparatus according to claim 12, characterized in that the cam drive a common power-driven camshaft (138) which is mounted on the press (10), and several cams mounted on the camshaft (13d) (141 ... 144), a cam disk (142, 143) being provided on each side of the press for pivoting the main pivot arms (62, 87). 14. The device me claim 13, characterized in that for opening and closing the transfer carrier (70, 7l) on each side of the press (10) cam disks (141, 144) are provided which open the carrier against the action of a compressed air spring, wherein the compressed air spring when the carrier closes under the control of the cam disks (141, 144) applies the gripping force. 15. Device according to one of claims 1 to 4, characterized in that that a pair of swiveling levers (80, oil resp. 3098 10/0585 8 5, Ö6) hinged to each of the two main pivot arms (82, 87) is, wherein the transfer carriers (70, 71) are mounted in the free ends of the relatively short pivot lever. 16. The device according to claim 15, characterized in that the pivot levers (80, 81, 85, 86) are connected to one another in this way are that they pivot in opposite directions. 17. The device according to claim 16, characterized in that a pivot lever (80, 81, 85, 86) pivoting Cam drive (141, 144) for opening and closing the carrier (70, 71) is attached to the press (10). 18. Device according to claims 1 and 17, characterized in that that the transfer drive is a cam drive (122 ... 131). 19. The apparatus according to claim 18, characterized in that the two transfer carriers simultaneously in the longitudinal direction back and forth sliding cam drive (122, 131) with the drives for opening and closing as well as for lifting of the two carriers (70, 71) is synchronized. 20. Apparatus according to claim 19, characterized in that the cam drive for sliding the transfer carrier back and forth a cam disk (131), a double lever (122) carrying a cam follower (130) with one arm, the with the free end of the other arm to the beams (70, 71) is connected, and one the cam follower (130) the cam disk (131) in abutment holding compressed air spring (128), wherein the carrier in the one longitudinal direction under the direct action of the cam and in the opposite direction under that of the cam controlled action of the compressed air spring are moved. 3098-0 / 0585 21. Device according to one of the preceding claims, characterized in that the pivot angle of the pivot lever (80, 01, 85, 86) to limit the closing movement by an adjustable one attached to a pivot lever (80) Stop (88, 89) is limited. 3 Ü ü S 1 U / U b 8 b