DE2532561C2 - Device for connecting at least two workpieces by cutting, pressing and upsetting - Google Patents

Description

The invention relates to a device for connecting at least two workpieces by cutting, pressing and upsetting using a single working stroke, according to the type specified in the preamble of claim 1.

Such a device is known from US Pat. No. 3,18,221, where a tubular anvil is used Element that is slidably surrounded by a likewise tubular die. The two together Workpieces to be joined are placed on the upper surface of the die, and via a hand-operated Eccentric lever is moved down a punch so that it is provided with one at its lower end pointed part pierces the two workpieces. With this piercing the die is through held by a compression spring. With further downward movement, the punch hits with an on average wider Part on the workpieces and now moves them with the die against the action of the compression spring down, so that the pierced hole edges are beaded on the annular upper surface of the anvil will. bo

Because the opening of the die by the thickness of the tubular The anvil is larger than the part of the punch used to pierce the workpieces, the There is a risk that the unsupported edge of the opening to be produced will tear. M.

Furthermore, the pierced hole must be large in relation to the thickness of the workpieces in order to be sufficient To provide material for the subsequent upsetting process. The material must be the Workpieces are stretched and bent back on themselves, which means that only very thin workpieces can be processed.

Furthermore, the force of the compression spring must be very large, to ensure that even with workpieces of high strength the piercing takes place at a distance from the anvil, because otherwise the subsequent upsetting process can no longer be carried out properly. One However, a strong compression spring means that a correspondingly high force is exerted on the hand lever for upsetting must become.

The invention is based on the object of a device of the type mentioned at the beginning, with which clean connections can also be made for workpieces larger thickness can be produced flawlessly.

The solution to this problem according to the invention is specified in the characterizing part of claim 1. The cam control of the die, which is then provided, ensures that the various parts the device inevitably in the for the individual Work steps each prescribed relative positions are moved. Furthermore, the fact that the Compress the die flush with the anvil, a smooth and sufficiently large work surface provided for the upsetting process.

From the German Offenlegungsschrift 22 26 555 it is known to use a punched piece during an upsetting process to be flush with an anvil, but this document relates to a riveting device and thus to a device that has fundamentally different requirements than for the device according to the invention.

Advantageous further developments of the invention are characterized in the subclaims.

An exemplary embodiment of the invention is explained in more detail below with reference to the drawings shows

F i g. 1 and 2 two metal sheets, seen from above and below, respectively, which by means of the device described here have been connected

Fig. 3 is a sectional view taken along the line 3-3 in Fig. 1,

Figure 4 is a sectional view taken along line 4-4 in Fig. 3,

F i g. 5 is a perspective view of a punch, a die and an anvil according to the invention,

F i g. 6 is a vertical sectional view of the device in the fully open initial position;

FIG. 7 is a sectional view similar to FIG. 6, but with the device is shown in a front position of the working stroke when the cutting of the metal sheets has just finished

F i g. 8 is a horizontal sectional view taken along line 8-8 in FIG. 6,

F i g. 9 is a horizontal sectional view taken along line 9-9 in FIG. 7,

FIG. 10 is a view similar to FIG. 6, but with the device is shown in a further position of the drive stroke, in which the die is straight is withdrawn

F i g. 11 one of the F i g. 6 similar view, with the device is in its fully forward position of the working stroke, in which the incised Section of the connection is compressed,

Figure 12 is a horizontal sectional view taken along the line 12-12 in Fig. 10,

13 shows a horizontal sectional view along the line

nie13-13inFig.il,

FIG. 14 is a sectional view similar to that of FIG. 6, but with the device in its return position of the withdrawal stroke is shown, in which the hallmark of the compressed section de? link is withdrawn

FIG. 15 is a view similar to FIG. 6, but with Parts are removed and the device is shown in its final position of the return stroke, wherein the die is over the anvil and the punch is fully retracted into position carry out the next working stroke,

16 is a sectional view taken along line 16-16 in FIG

Fig. η.

Figure 17 is a schematic view taken along line 17-17 in Fig. 14th

In the drawing, a device 20 and a connection 21 made therewith are shown 20 comprises a frame 27 which surrounds or holds the other parts. The frame 27 is made up of a large one Metal block with a cavity 30, a crank opening 28, a conveyor space 29, an access opening 31 and an opening 33 hooking an anvil A power source 32 is arranged on frame 27, which gives a toggle lever 51 a reciprocating movement Power source 32 has a full stroke that consists of a There is a working stroke and a return stroke. In the exemplary embodiment, the power source 32 is a pneumatic one Cylinder with a piston rod having a rod end 56. A pivot 54 is with the rod end 56 by means of a bolt 55 and connected to the lever 51 by means of a bolt 52. The lever 51 is also with a punch holder 45 by means of a bolt 50 and with a pair of links 57 by means of a Bolt 53 connected. These members 57 are connected to the frame 27 by means of a bolt 61. Staring at A cam actuator 58 is arranged on the links 57, the spaced apart cam actuating fingers 59 and 60 has. A cam 62 is arranged between the links 57 and on the bolt 61, the one cam recess 65, spaced apart cam shoulders 63 and 64, welehe form a further cam recess therebetween and have a cam surface 66. Combined with The cam 62 is operated by a cam follower 67, which is connected to the die holder 37 by means of a bolt 68 is connected in an opening 40. This holder 37 consists of a further metal block with a spring space 39, a cam follower opening 40, a lever opening 38 and another opening 41, the is trained therein. This die holder 37 is vertical in the space 30 upwards from the cam 62 and movable downward by a compression spring 44. A die 69 is close to the lower end of the die holder 37 and contains an anvil opening 70. An anvil 42 is rigid on the frame 27 in the opening 33 arranged. A working end 43 of the anvil 42 slidably fits into the opening 70 of the die 69. Cover plates 34, 35 and 36 serve to enclose the die holder 37 and the punch holder 45 in the space 30. The punch holder 45 connected to the lever 51 via the bolt 50 consists of another metal block with an opening 46 and a punch holder opening 47 formed therein. A punch 48 is rigidly attached the punch holder 45 arranged. The spring 44 is contained in the spring chambers 29 and 39 and serves to to maintain cam follower 67 in contact with cam 62.

In Figure 6, the device 29 is at the beginning of the working stroke of power source 32 is shown with the cam actuating finger 60 connected to the cam shoulder 63 in FIG Is engaged and the cam follower 67 holds on the cam surface 66, which in turn pushes the spring 44 and the die above the working end 43 of the anvil and the working end 49 of the punch above the die 69 holds, everything within the access opening 31. The work pieces in the form of metal sheets 22 and 23

ίο are either guided into this access opening 31 and arranged on the die 69 in a suitable position below the punch 48 where the connection 21 is to be formed is, or the sheets 22 and 23 are held stationary and the device 20 is around these sheets 22 and 23 placed in position so that the latter are located in the access opening 31 to the connection 21 to form in the desired location. During a first part of the working stroke, the working end 49 the punch 48 moves towards the die 69 and pierces it during a second cycle of this working stroke the punch 48 the sheets 22 and 23, as shown in FIG. 7 is shown with a recess 25 in the joint 21 is formed. The bolts 50, 53 and 61 form one with the lever 51 and the links 57 Three-pin toggle joint mechanism, the pin 61 remaining stationary while the pin 50 is on and off moves off and the bolt 53 moves into and out of alignment with the bolts 50 and 61. When the bolt 53 is aligned with bolts 50 and 61 is the knee joint

jo mechanism locked and if the bolt 53 except When it is in alignment with bolts 50 and 61, the toggle mechanism is unlocked. Such a movement of the Punch 48 is removed directly from the hinge mechanism after initial downward movement of the rod end 56 carried out. The hinge mechanism connects the punch 48 with the power source that, on the one hand, the The punch is driven in a substantially harmonic movement with respect to the frame 27, and on the other hand, that the first and second increases in force during the cutting and upsetting in the Formation of this connection 21 is made possible.

The cutting with the punch 48 is completely finished before the bolt 53 moves into its blocking position emotional. When the push-through is performed, the cam operating finger 59 moves toward the Nockcnschulter 64 and rotates the cam 62, so that during a third portion of the working stroke Cam 62 causes cam follower 67 to move into the cam recess under the pressure of spring 44

so 65 moved so as to withdraw the die 69 under the working end 49 of the punch 48, as shown in FIG. 10 is shown. Withdrawal of the die 69 below the working end 49, as shown in FIG. 10 the subsequent upsetting stage creates space for upsetting the cut material on the side of the metal sheets 22 and 23 opposite to that of which the recess 25 is formed, such as especially at 26 in FIG. 4 is shown. During such movement the die 69 leaves the shoulder

bo 64 the finger 59 when turning the cam 62 through the Cam follower 67. Such movement of die 69 is indirect from the knee joint mechanism after further downward movement of the rod end 56 and performed directly by the cam follower 67, which moves into the cam recess 65. During a fourth and final section of the Working stroke, the working end 49 of the punch 48 is moved towards the working end 43 of the anvil 42 and

compresses the cut parts of the sheets 22 and 23, as shown in FIG. 11 is shown. Such a move the hallmark 48 is taken directly from the knee joint mechanism executed, which after the final downward movement of the rod end 56 in the locked position emotional. The magnitude of the force from the power source 32 by means of the hinge mechanism has during this Upsetting process a maximum. The upsetting of the punch 48 is achieved by terminating the movement of the Bolt 53 ends in its locked position at the end of the working stroke of the power source 32. During this Step, the cut portions of the sheets 22 and 23 are enlarged or, as shown at 26 is, driven to a larger dimension than the recess 25, so that the connection 21 completely and is permanently locked.

During a first portion of the return stroke of the power source 32, the punch 48 is removed from the anvil 42 moved away and out of the recess 25 before the die 69 is moved as shown in FIG. While such movement of the punch 48 moves the finger 60 to the shoulder 63 with idle action (because the cam recess between the cam shoulders 63 and 64 is larger than the distance between the Fingers 59 and 60), so that any movement of the die 69 during a retraction of the working end 49 upward from the recess 25 and away from the sheets 22 and 23 is prevented to ensure that the just formed and final molded connection 21 is in no way deformed or removed from the die 69 is damaged. Such movement of the punch 48 is exerted directly by the hinge mechanism, which moves out of its locked position after the rod end 56 has initially moved upward. This idling effect is designated by "71" (see Fig.7 and U) and allows the lever 51, the Raise punch 48 before the cam actuation finger 60 hits the cam shoulder 63 during the return stroke touched. During a second and final section of the return stroke, the die 69 is retracted raised to their starting position, as shown in FIG. 15 is shown. The top of FIG. 15 (not shown) is identical to that shown in FIG. 6 shown Such movement of the die 69 is indirect from the knee joint mechanism at final Upward movement of rod end 56 and exerted directly by cam follower 67, soft out of the Cam recess 65 is moved because the cam finger 60 presses on these shoulders 63 around the cam follower 67 to lift onto cam surface 66. During such movement of the die 69, the parts the device 20 is moved back to its respective starting positions with the spring 44 in its initial startup state is printed. The work pieces are either moved out of the access opening 31, and new workpieces are on their Place and the operation described above will be repeated or the same workpieces moved to a new position to repeatedly create spaced connections (This is sometimes referred to as a mechanical stitching made from spaced apart Connections exist), or the device 20 is while the workpieces are held stationary, either to new workpieces or to the same workpieces are moved to form this mechanical stitching seam. The device 20 is not only in the vertical position, but also in a

Upside down or in any other position.

The device is operated in one full stroke of the power source 32, and during such a stroke In operation, the punch 48 moves with respect to the frame 27 in a substantially harmonious movement during the full stroke of the power source 32 due to the action of the bell crank mechanism. The anvil 42 remains stationary with respect to the frame 27 during the entire operation. While

ίο the first section of the working stroke moves Die 48 down to meet the anvil 42 and then the incision is done during one second section of the working stroke performed by the punch 48, which the metal sheets 22 and 23 and the recess 25 forms while the die 69 is held raised with respect to the anvil 42 will. A first force multiplication of the power source 32 is applied to the punch 48 by the knee joint mechanism achieved during this incision. Following this, the die 69 is during a third Section of the working stroke is lowered to the working end 43 of the anvil 42 to allow itself to expand of the work piece that occurs during the subsequent upsetting process. During the The fourth and final section of the working stroke are the pressed-through parts of the metal sheets 22 and 23 are compressed by moving the punch 48 into their maximum closed position with respect to the anvil 42. A force multiplication of the power source 32 through the joint mechanism at the punch 48 is at a maximum, and this widening 26 of the cut portions occurs at this upsetting stage. The return stroke the power source 32 begins at the end of the upsetting stage and during the first section of this return stroke the die 69 remains stationary with respect to the working end 43 in order to move the punch 48 out of the To ensure recess 25 and over the workpieces before a movement of the die 69. During the second and final part of the return stroke, the die 69 is raised over the working end 43, and the punch 48 is raised further above the workpieces so that the die 69 and punch 48 are their respective ones take initial starting positions.

For this purpose 4 sheets of drawings

Claims (3)

Patent claims: 1. Device for joining at least two permanently deformable workpieces, one of which is at least one one is plate-shaped by cutting the workpieces. Pushing through and upsetting the cut area by means of a single working stroke, with a punch, a die and a Anvil, being in a first section of the working stroke for cutting and pushing through The punch and die can be moved relative to one another and in a second section of the working stroke for upsetting the punch and anvil, as well as the die and anvil, are each initially movable against one another and then are stationary, characterized by that the movement of the die (69) by means of a cam rotated by the working stroke (62) is controllable and that the die (69) by the cam (62) from a first relative to the Anvil (42) stationary position in which the cutting and pressing takes place in a second relative is displaceable to the anvil (42) stationary position in which the die (69) is flush with the anvil (42) completes and the upsetting takes place. 2s 2. Apparatus according to claim 1, characterized in that the anvil (42) with respect to a tool frame (27) is stationary. 3. Apparatus according to claim 1 or 2, characterized in that the relative movement of the die (69) in its flush position with the anvil (42) takes place faster than the relative movement between Punch (48) and anvil (42) in the second section of the working stroke. 35