DD295584A5 - PNEUMATICALLY OPERATED DEVICE FOR PLASTIC FORMING, ESPECIALLY FOR HARD STAMPING - Google Patents

Abstract

In a pneumatically operated device for plastic preforming, in particular for punch stamping, punching, caulking, fitting, riveting, Boerdeln and the like., With a in a Fuehrungszylinder (2) between two positions movably arranged druckluftbeaufschlagbaren percussion piston * by at least one holding magnet (18 Holding device (25) is held in a release position located at one end of the guide cylinder (2), a deformation tool displaceably received at the other end of the guide cylinder (2), and a control valve (33) of a pulse device by axial loading via a release device (40) (30), by which the percussion piston (12) can be pressurized on the front side and is released when the holding force of the magnet (8) is exceeded and a shock impulse transfer to the deformation tool (7) is triggered, and a return element * by the percussion piston (12) again in engagement with the Haltevo direction (25) can be brought, a variable impact pulse, d. h., a Schlagkraftaenderung and a simplification of the Ausloesevorrichtung achieved byzast the holding device (25) has an adjusting device (26) for changing the holding force between the magnet (18) and the Ausloesestellung percussion piston (12) and dasz the pulse device (30) a pressure chamber (31) which can be pressurized and deflated via a single control valve (33). Fig. 1 {pneumatic device; plastic deformation; Blow temples; Percussion piston; Holding magnet; Pulse device}

Description

For this 3 pages drawings

Field of application of the invention

The invention relates to a pneumatically operated device for plastic deformation, in particular for impact stamping, punching, caulking, fitting, riveting, flanging and the like., With a in a guide cylinder between two positions movably arranged druckluftbeaufschlagbaren percussion piston, which by a holding magnet having at least one holding device in a located at one end of the guide cylinder release position is a displaceably received at the other end of the guide cylinder deformation tool, which by axial load on

a triggering device controls a control valve of a pulse device by which the percussion piston is frontally pressurizable and is released when the holding force of the magnet is exceeded, whereby a shock pulse is transmitted to the deformation tool, and a return element, by which the percussion piston can be brought back into engagement with the holding device.

Characteristic of the known technical solutions

Such a pneumatic impact tool is known from CH-PS 655680. There, a percussion piston is shown, which is slidably mounted in one of both ends acted upon by compressed air cylinder space. The percussion piston is held in the rest position by a magnet at a cylinder end. At the other end of the cylinder a slidably mounted plunger is provided, one end of which carries a deformation tool and has two radial flanges which are displaceable in adapted cylindrical cavities of the plunger guide between an upper and lower position. The plunger is held by a compression spring acting in the direction of impact in a rest position. When the deformation tool is pressed onto a workpiece, the position of the plunger flanges in the cavities changes, so that a control valve having a plurality of control valves is actuated via compressed air control lines, and an end face of the percussion piston is pressurized air through a bore of the magnet. After overcoming the magnetic holding force, the percussion piston detaches from the magnet and strikes the ram. Thereafter, the compressed air by means of a timed valve of the control device, which in turn is controlled by the position of the plunger flanges, directed into the other end of the cylinder chamber whereby the percussion piston is moved back to its rest position on the magnet.

The impact tool described has a number of disadvantages. The impact force of the percussion piston can be changed only conditionally on the amount of pressurization. Only when a sufficient pressure to overcome the magnetic holding force is built up on the front side of the percussion piston, a release of the percussion piston, so that although it is acted upon from the beginning of his Schlaghubes at high pressure, but the Ablösezeitpunkt and thus the impact force is dependent on the magnetic holding force. By abrupt application of a compressive force which is greater than the magnetic holding force, although a higher impact pulse and accordingly a greater impact force can be generated, but never a shock pulse are triggered whose impact force is less than the magnetic holding force. Another significant disadvantage is that a complicated, multiple pulse valves having control device is provided to apply the corresponding cavities of the plunger guide and the pressure chamber, at the right time depending on the position of the plunger and the percussion piston with compressed air or to vent.

From DE 3112463 A1 a compressed air ram is known in which the percussion piston is also held by means of magnets in its release position. A control of the impact force is, as expressly mentioned there, only possible via a dimensioning of the holding magnets or by controlling the compressor performance. However, the smallest possible impact force is also determined here by the holding force between magnet and percussion piston. The same disadvantages are also present in a known from DE-AS 2111653 pneumatically operated knocker.

From DE 212451992 B1 and FR-PS 1510061 pneumatic marking hammer and DE-AS 1029759 a pneumatic nail impact device are known, which also have a pressurized impact piston, but is held in the locked position either via compressed air or a mechanical locking device. A triggering of the stroke is also not only upon contact of the embossing tool with the workpiece, but via a manual device, so that an unintentional triggering with appropriate risk to the operator is given. Furthermore, mechanical impact stampers are known, for example from the company Manfred Brochies GmbH under the name "Marcator MV", in which the impact impact force is generated on a deformation tool by the expansion of a spiral pressure impact spring acting on a percussion piston A disadvantage of the hand-operated device shown there, however, is that for triggering the shock a high feed force must be applied by pressing the punch on the workpiece, since the spring lock the percussion piston in the release position only by appropriate force through Another disadvantage is that all moving parts must be lubricated for proper operation and wear of the parts is possible.The latter drawbacks are also present in such impact stampers, which via a pneumatic An operation in production facilities are automatically deliverable.

Object of the invention

By the invention it is possible to make the setting of the percussion piston pulse variable and to simplify the valve control considerably. By reducing the number of moving parts in the device, the susceptibility to damage is greatly reduced. In addition, a space-saving and handy design of the holding device is achieved.

Explanation of the essence of the invention

In avoiding the disadvantages, the invention has for its object to make a device of the type mentioned so that a variable impact pulse triggering is possible, i. the impact force is variable, with a further simplification of the trigger control is sought.

To achieve this object, it is provided that the holding device has an adjusting device for changing the holding force between the magnet and the impact piston located in the impact position, and that the pulse device has a pressure chamber, which can be pressurized and vented via a single control valve. As a result, a variable adjustment of the impact piston pulse is possible, wherein the available impact A / erformungsenergie the deformation tool can be varied to the workpiece. If, in a known manner, a compression spring of low spring force is arranged between percussion piston and the lower part of the guide cylinder, a valve reversal can take place

account for the provision of the percussion piston to the holding device, whereby the valve control can be considerably simplified. The pressure chamber of the pulse device, in which the necessary pressure гиг generation of the impact pulse is built up, can thereby be pressurized or vented via a single control valve. By providing a pressure chamber, moreover, a larger amount of air can be compressed, so that in comparison to the impact tool from the CH-PS 655680 a larger under impulse pressure air mass additionally drives the percussion piston. Another advantage of this device is that the number of moving parts in the device is greatly reduced and the susceptibility to damage is reduced. Characterized in that the pressure which can be generated in the pressure chamber can be varied by changing the magnetic holding force, the impact force of the percussion piston is set to the deformation tool. A particularly simple embodiment provides that the distance between the magnet and the impact piston located in the impact piston can be changed by the adjustment. In this way, an effective and simple method is given, as the holding force of the magnet relative to the applied compression pressure of the pressure chamber can be changed. In order to ensure in a simple manner, an action of the magnet with the percussion piston, it is provided that the holding device may comprise a magnetic cylinder, in which the magnet is received in a receiving recess limited axially displaceable that the percussion piston in its release position on a receiving recess having bearing end face of the magnetic cylinder rests and that the distance of the magnet to the plant end face is variable by the adjustment device.

Characterized in that the magnetic cylinder may have at least one receiving bore in which a magnet connected to the fastening element, in particular a fastening screw is axially limited slidably guided, and that the magnet against the action of at least one compression spring by engagement of the adjusting device with the fastener or the magnet in a desired distance to the contact end face of the magnetic cylinder can be brought, a so-called. "Floating storage" of the magnet is achieved in the receiving recess, wherein against the action of the compression spring a simple delivery of a suitable element of the adjustment is sufficient to change the distance of the magnet to the plant end face In order to enable a space-saving design of the holding device and the use of standard commercial parts, it is provided that the holding device may have four preferably cylindrical magnets, which in four equidistant to each other about the Längsach The magnets are held axially displaceable by engaging in this fastening screw fastening, wherein the fastening screw can pass through corresponding receiving holes of the rear end face of the magnetic cylinder, in particular the spacer sleeves and are axially movable against the action of compression springs, respectively arranged around the spacers and frictionally between the rear end wall and a screw heads receiving the screw holder are arranged and that the distance of all magnets to the plant end side is simultaneously changed by the engagement of the adjustment. By the arrangement of the compression springs outside the receiving recess around the fastening screw around it is ensured that the entire region of the receiving recesses can be used as a displacement area for the magnets. The distance of the magnets to the plant end face can thus be changed by simply axial displacement of the screw holder. In order to enable the most compact possible embodiment of the pneumatically operated device, it is provided that the pressure chamber arranged in the axial extension of the guide cylinder may be provided within a cylindrical connecting sleeve, the upper end is closed by a closure body and its closed lower end at least one pressure bore has, which connects the pressure chamber with the interior of the guide cylinder. As a result, a handy design of the device is given at the same time. The magnetic cylinder can be used at the same time as a connecting element between the connecting sleeve and the guide cylinder, for which purpose the magnetic cylinder has two external thread areas which are separated from one another by a peripheral flange and engage in corresponding internal threads for the connecting sleeve or the guide cylinder. The rear end wall of the magnetic cylinder thus forms a provided with at least one pressure bore lower end of the pressure chamber.

The control valve may advantageously be formed in the interior of the closure body in particular in the form of a З / 2-way valve and be connectable via a likewise provided on the closure body gas connection with a compressed air source. To control the control valve, this is connected to the triggering device. As a result, a pressurization of the pressure chamber takes place only when the triggering device, so that an additional backup of the percussion piston is given in its release position. In order to ensure that the device can only be triggered on the workpiece when the deformation tool is applied, it is provided that the triggering device of the deformation tool includes a return spring which is engaged therewith and a switching rod arranged between the control valve and the deformation tool.

A simple physical embodiment of the control valve advantageously provides that the control valve may have a cylindrical valve control body which is axially displaceable in a guide bore via the shift rod against a spring, so that in non-positive engagement of the deformation tool with the workpiece to be machined in zurückbewegter position of the shift rod the valve control body holds a closing cone against spring force action in a compressed air release position, whereby pressurized air via a gas connection piece passes into the guide bore and the pressure chamber is pressurized via a supply channel and that when the switching rod of the valve control body and the closing cone are in a closed position, whereby the guide bore separated from the compressed air source and the pressure chamber is vented via a Entlüfturigskanal.

In order to keep the magnets by means of a not extra secure adjustment mechanism in correct holding distance in the magnetic cylinder slidably, it is provided that the adjustment may have a respect to the magnetic cylinder axially displaceable adjusting member, in particular an adjusting nut, via an adjusting member, in particular a setting on the Fastening elements or the magnet engages, so that by actuation of the adjusting member, the distance of the magnet is in the release position located percussion piston between two positions continuously adjustable.

Characterized in that the adjusting nut may be a union nut, and this is in engagement with a thread formed at the rear end of the closure body, a simple embodiment of the adjusting member is given, and further two Einstellstifte may be received in sealing engagement in axial guide holes of the closure body, so that they are with their ends in engagement with the adjusting nut and the screw holder, so that by a

Rotation of the adjusting nut of the / the magnet / e against the force of the compression springs in their distance from the contact end face of the magnetic cylinder are changeable.

In order to integrate the pneumatic device in automatic processes, z. B. in assembly, testing, measuring or production facilities for stamping, crimping,. The like., It is provided that a deliverable pneumatic device, the device housing consisting of guide cylinder and guide sleeve in a receiving guide, in particular a cylinder housing can accommodate axially movable and that the device housing can be continuously reciprocated by a drive device between a rest position and a working position in which the deformation tool is engaged with a workpiece to be machined.

Characterized in that the end walls of the cylinder housing are penetrated in sealing engagement of both ends of the device housing and in that the device housing may have a radially enlarged portion, in particular a peripheral flange which is sealingly fitting on the inner peripheral wall of the cylinder housing feasible and thereby forms two annular pressure chambers, is it is possible to move the device housing in the cylinder housing between the working position and the rest position by alternately pressurizing the pressure chambers, whereby a simple pneumatic feed device is provided.

For integration into an automatic production line, it may be particularly advantageous that the cylinder housing can be mounted on a connection plate by means of fastening elements. In order to enable a travel limitation of the device housing in the cylinder housing, it is provided that the device housing can have an axially displaceably arranged and fastened in an axial position on the device housing stop element, in particular in the form of a clampable stop. An anti-rotation of the device housing in the cylinder housing can be achieved by engaging the stop member in a guide of the stop plate.

Characterized in that the magnetic cylinder may have the peripheral flange as an integral part, a separately vorzusehender circumferential flange can be avoided.

Further advantageous embodiment of the invention are defined in the subclaims and are explained in more detail below with reference to an embodiment.

embodiment

Fig. 1: shows a longitudinal section through a pneumatically operated device according to the invention, which serves among other things for striking stamping.

Fig. 2: shows a guided along the line II-H cross-section through the apparatus of FIG. 1 in an enlarged scale. 3 shows a section along the line HI-III of the device shown in Fig. 1 on an enlarged scale. 4 shows a section along line IV-IV of the device shown in Fig. 1 on an enlarged scale. Fig. 5: shows a longitudinal section through a deliverable pneumatic device which is axially displaceable axially in a cylinder housing.

Fig. 1 shows a cylindrical ausgestaltet embodiment of a pneumatically operated device for the plastic deformation of workpieces. Such a device is used in particular for impact stamping. It is also possible to use this as a piercing, caulking, press-fitting, riveting or crimping device and the like., D. H. wherever a plastic deformation is to be performed by striking a deformation tool on a workpiece. The device housing 1 is constituted by two cylindrical sleeves, the guide cylinder 2 and the connection sleeves 3 which can be connected thereto at the front. The device housing 1 is sealed at its rear end by a closure body 4 in a sealing manner. In this embodiment, the likewise cylindrical closure body 4 is screwed by means of a fine thread in the rear end of the connecting sleeve 3 and sealed by a housing seal 5 located in a circumferential groove. The device housing 1 has at its front end a screwed into the guide cylinder 2 guide body 6, which has a centrally located axial through hole. In this hole a deformation tool 7 is received axially displaceable; the deformation tool 7 shown here is designed in the form of a firing pin, wherein other embodiments adapted to the intended use, can be used. It is also conceivable, at the top of the deformation tool 7 to unscrew a, adapted to the respective purpose deformation attachment or otherwise secure. Arranged between the deformation tool head 7 and the guide body 6 is located in the interior of the guide cylinder 2, a damping ring 8 made of a hard elastomeric material. The deformation tool head 7 'is held in abutment with the damping ring 8 by a return spring 9 which is arranged at the front end of the guide body 6 in a recess 10 around the deformation tool shank 7' and engages with the deformation tool 7 via a support ring 11 secured by a snap ring located. The deformation tool 7 is thus limited axially displaceable against the force of the return spring 9 in the through hole.

Within the guide cylinder 2 is a cylindrical percussion piston 12, which is preferably made of an extremely hard material such as stainless steel or the like. This is arranged axially movable and is engageable with the deformation tool 7 against the only weak restoring force of a return spring 13. The percussion piston 12 has arranged in circumferential grooves piston seals 5 ', which should ensure a sealing contact of the percussion piston 12 with the inner wall of the guide cylinder 2 as far as possible.

Between guide cylinder 2 and connecting sleeve 3 is a magnetic cylinder 14 (Fig.3,4). In the embodiment shown, the magnetic cylinder 14 is used as a connecting piece between the connecting sleeve 3 and guide cylinder 2, for which purpose the magnetic cylinder 14 has two externally threaded regions which are separated from one another by a peripheral flange 15, which engage in corresponding internal threads of the connecting sleeve 3 or the guide cylinder 2. In order to achieve a seal between the parts 2,3,14, this housing seals 5 are provided. The peripheral flange 15 has the same outer diameter as the connecting sleeve 3 and guide cylinder 2. In other embodiments, the peripheral flange 15 may be omitted or, as will be shown later, have a much larger outer diameter.

The magnetic cylinder 14 has four equidistant arranged around the longitudinal axis of the device housing 1 receiving recesses 16, the guide cylinder side on an investment end face 17 extending cylindrical in the interior of the magnetic cylinder 14 extend. In the receiving recesses 17 also cylindrical magnets 18 are limited axially slidably received, which are smaller in length than the Aufnahmeaufnehmungen 6. The magnets are each held axially displaceable by engaging in this mounting screws 19, by corresponding axial receiving holes 20 in the rear end wall 21st of the magnetic cylinder 14 run. The heads of the fastening screws 19 are arranged sunk at a distance from the rear end wall 21 arranged in a screw holder 22, wherein the screw shafts extend within spacer sleeves 23, the front side fitting between screw holder 22 and magnets 18 through the mounting holes 20. The initial position of the magnets 18 at the bottom of the receiving recess 16 is secured by the engagement of arranged between the rear end wall 21 of the magnetic cylinder 14 and the screw holder 22 about the spacers 23 compression springs 24.

Thus, a holding device 25 is formed, by which the percussion piston 12 is held by the magnetic holding force of the magnets 18 in a release position on the plant end face 17 of the magnetic cylinder 14. In order to effect a change in the holding force between magnet 18 and the percussion piston 12 located in the release position, the distance between the magnets 18 and the abutment face 17 can be changed by means of an adjusting device 26. The change in the distance of the magnets in relation to the percussion piston 12 takes place only in a small millimeter range, since this is sufficient to sufficiently influence the magnetic holding force. The individual magnets 18 can also be replaced by a single annular magnet. In the case of the use of electromagnets also another type of change in the holding force between the magnet 18 and percussion piston 12 is conceivable, in which case a distance change of the magnets 18 in the magnetic cylinder 14 need not be made.

Between the rear end wall 21 of the magnetic cylinder 14 and the closure body 4, a pressure chamber 31 is formed within the connecting sleeve 3. It forms the actual core of a pulse device 30, which further includes a compressed air source, not shown, which can be connected via a gas connection pipe 32 and a control valve 33 to the pressure chamber 31. To allow pressurization of the percussion piston 12, the magnetic cylinder 14 has axial pressure bores 34 which connect the pressure chamber 31 to the interior of the guide cylinder 2 (FIG. 2). The control valve 33 is formed in the interior of the closure body 4 in the form of a З / 2-way valve and has a cylindrical valve control body 35, which is received in a longitudinal axis in the middle extending through the closure body 4 guide bore 36. In rearward axial extension to the valve control body 35 is located in an extended region of the guide bore 36, a closing cone 37 which is movable against a spring by the valve control body 35 from the guide bore 36 closing position, so that via the gas connection pipe 32 compressed air into the interior of the guide bore 36 can get. The guide bore 36 is connected in a known manner via a supply channel 38 to the pressure chamber 31 and connected via a vent channel 39 with the environment. On the operation of a З / 2-way valve need not be discussed here, as this is assumed to be generally known.

For actuating the control valve 33, a switching rod 41 is provided, which projects into the interior of the closure body 4 in the guide bore 36 and is in abutment with the valve control body 35. The switching rod 41 runs along the longitudinal axis of the device housing 1 through corresponding axial bores in the screw holder 22, the magnet cylinder 14 and the percussion piston 12 and comes to rest in a corresponding receiving bore of the deformation tool head 7 " as a contactor comprises the deformation tool 7 and with the deformation tool 7 in engagement located return spring 9 comprises.

To operate the pneumatic device it is pressed with the deformation tool 7 against a workpiece; on further delivery, the deformation tool 7 moves against the force of the return spring 9 and transmits this movement to the coupled thereto shift rod 41. The shift rod 41 transmits the short stroke movement on the valve control body 35, which is characterized by a venting position-which Pressure chamber 31 is connected via the supply channel 38 through the guide bore 36 and the interior of the valve control body 35 with the vent passage 39 is in a pressurizing position; In this case, the valve control body moves the closing cone 37 from a closed position, the compressed air supply is released into the interior of the pressure chamber 31; the venting channel 39 is closed at the same time. The pressure built up in the pressure chamber 31 is applied via the pressure bore 34 through the magnet cylinder 14 to the rear end surface of the percussion piston 12. If during the phase of Druckauf construction in the pressure chamber 31, a pressure force generated that exceeds the holding force between the magnet 18 and impact piston 12 slightly, the impact piston 12 tears instantaneously from the magnetic cylinder 14 los. After releasing the percussion piston 12 from the magnetic cylinder 14 no further pressure build-up in the pressure chamber 31 takes place, so that the percussion piston 12 is accelerated with the currently available pressure force of the air pressure. This moves, driven by the force of the compressed air, which acts on the entire end face of the percussion piston 12 and the weight of the percussion piston 12 is superimposed in the direction of the deformation tool 7. The air in the guide cylinder 2 escapes over four radially arranged in the guide cylinder 2 Vent bores 43, which are arranged in the lower region in the vicinity of the guide body 6. A shock transmission from the percussion piston 12 on the deformation tool 7 takes place and thus a plastic deformation of the adjacent thereto workpiece. In order to return the percussion piston 12 from its impact position to its release position, the return spring 13 is provided. By removing the pneumatic device from the workpiece, the deformation tool head 7 "is again brought into abutment with the guide body 6 by the return spring 9, the shift rod 41 is in turn brought back into the starting position by a spring arranged between the closing cone 37 and valve control body 35. In this way, the control valve 33 closed to the compressed air side, wherein the venting position is reached at the same time.The percussion piston 12 is now pressed by the return spring 13 in the release position.

As already mentioned, the magnetic holding force with which the magnets 18 hold the percussion piston 12 in the release position on the magnetic cylinder 14 can be changed by means of an adjusting device 26; This is a change in the impact pulse force with which the percussion piston 12 occurs on the deformation tool 7, given that the impulse with which the percussion piston 12 grabs the deformation tool 7, depending on the distance of the magnets 18 to the percussion piston 12 in the release position. If the distance between percussion piston 12 and magnet 18 is reduced, then a strong holding force is present in the release position, the distance is increased, then the holding force and accordingly the pressure applied in the pressure chamber 31 until the triggering time decreases.

In order to change the distance between the magnets 18 in the magnet holder 14, an adjusting nut 27 'and two adjusting pins 28 are provided in the embodiment shown here. The adjusting nut 27 'is rotatably mounted in the form of a union nut at the rear end of the closure body 4 via an external thread formed on this. Two adjusting pins 28 are received in sealing engagement in axial guide holes 29 of the closure body 4 and are located with their ends on the one hand in engagement with the adjusting nut 27 'and on the other, through the pressure chamber 31 extending, with the screw holder 22. The adjusting nut 27' can are now rotated so that the screw holder 22 is moved against the force of the compression springs 24 along the axial axis of the device housing 1 and thus the distance of the magnets 18 to the contact end face 17 of the magnetic cylinder 14 is changed. Depending on the selected thread pitch of the closure body 4 and adjusting nut 27 'provided thread a stepless fine adjustment of the distance of the magnets 18 is given to the in-release position impact piston 12 and thus the magnetic holding force. The pneumatic device thus described is suitable for manual operation. In order to keep the device at hand at the workplace, this has a mounting bracket 42 attached to the closure body 4. If the described pneumatic device, however, be integrated into automatic processes, eg. As in assembly, testing or production facilities for stamping a mark, flanging or the like., An undeliverable pneumatic device as shown in Figure 4 is provided.

This has the pneumatic device already described in a receiving guide in which the device can be moved axially. Thus, the device can be continuously reciprocated by a suitable drive device between a rest position and a working position in which the deformation tool 7 is engaged with a workpiece. In the embodiment shown here, the receiving guide consists of a cylinder housing 50, in which the device housing 1 is axially movably received, wherein the end walls 51 ', 51 "of the cylinder housing 50 each have a cylindrical opening through which the rear and front end of the device housing. 1 In order to achieve a sealing engagement of the smooth ground device housing 1 in the openings of the end walls 51 ', 51 ", these have sealing rings 52 in circumferential grooves. The rear end wall 51 "is provided as a removable cover, which is fixed in sealing engagement with the peripheral wall 51 of the cylinder housing 50. The device housing 1 has a peripheral flange 53 extending radially to the longitudinal axis, which is in a form-fitting manner against the inner peripheral wall 51 annular pressure chambers 54,54 'are formed, which are bounded by the wall of the device housing 1, the peripheral flange 53 and the peripheral wall 51 and the end walls 51', 51 ". In order to achieve a substantial sealing of the pressure chambers 54,54 'from each other, the peripheral flange 53 in a rectangular circumferential groove has an O-ring-shaped flange seal 55, which bears against the inner circumferential wall 51. In the embodiment shown here, the peripheral flange 53 is an integral part of the magnetic cylinder 14 and thus corresponds to the peripheral flange 15, which, as already stated, has a larger diameter than the device housing 1. The peripheral flange 53 can also be formed as a separate component between the guide cylinder 2 and the connecting sleeve 3 in the form of a circular disk, which can be connected via suitable fastening means, for example. An integrally formed thread either with the magnetic cylinder 14 or with one of the device housing parts 2.3. By this configuration of the device housing 1 with the radially expanded area, d. H. the peripheral flange 53, the pneumatic device can be regarded as a piston rod with piston, which is held displaceably in the cylinder housing 50 between two positions. For pressurizing the annular pressure chambers 54,54 ', the cylinder housing 50 has two compressed air access ports 56,56', which are each connected to one of the pressure chambers 54,54 '. This compressed air access port 56,56 'are attached in the example shown here on the peripheral wall 51 and in the form of L-quick connectors, which, for example, the company FESTO with the type designation LCK-M 5-PK4 provides executed. These are supplied with compressed air using a 4/2-way valve, which is not shown here, and controlled. Thus, an alternating pressurization of the pressure chambers 54,54 'possible, whereby the pneumatic device is engageable with the workpiece and can be moved back out of this engagement. The triggering of the percussion piston 12 from the release position is carried out in the same manner as the release in the hand-operated pneumatic device. In order to achieve a stroke limitation of the pneumatic device in the cylinder housing 50, the device housing 1 at the end of the closure body 4 has an axially displaceably arranged and clamped in an axial position on the device housing 1 stop ring 57. Upon reaching the stop limit position, the stopper ring 57 abuts against the rear end wall 51 "of the cylinder housing 50. The cylinder housing 50 is mounted on a terminal plate 58 by fastening screws Rotation of the pneumatic device within the cylinder housing 50 is prevented.

There are also other drive concepts possible that can automatically move the pneumatic device on the receiving guide (cylinder housing). This can be done mechanically or in another known manner.

Claims (13)

1. A pneumatically operated device for plastic deformation, in particular for striking stamping, punching, caulking, fitting, riveting, flanging and the like., With a in a guide cylinder (2) between two positions movably arranged druckluftbeaufschlagbaren percussion piston (12) by at least one Holding magnet (18) holding device (25) is held in a at one end of the guide cylinder (2) located release position, at the other end of the guide cylinder (2) slidably received deformation tool (7) by axial load on a triggering device (40) Control valve (33) controls a pulse device (30) through which the percussion piston (12) is frontally pressurizable and is released when the holding force of the magnet (8) is exceeded and a shock pulse transmission to the deformation tool (7), and a return element (13) through which the percussion piston (12) again engages the H Old device (25) can be brought, characterized in that the holding device (25) has an adjusting device (26) for changing the holding force between the magnet (18) and the striking position in the percussion piston (12) and that the pulse device (30) has a pressure chamber ( 31) which is pressurizable and vented via a single control valve (33). 2. Pneumatically operated device according to claim 1, characterized in that in the pressure chamber (31) producible pressure can be varied by changing the magnetic holding force. 3. Pneumatically operated device according to claim 1 or 2, characterized in that the distance between the magnet (18) and the striking piston in the release position (12) by the adjusting device (26) is variable. 4. A pneumatically operated device according to claim 3, characterized in that the holding device (25) has a magnetic cylinder (14), in which the magnet (18) is received in a receiving recess (16) limited axially displaceable, that the percussion piston (12) in its release position on a receiving recess (16) having investment front side (17) of the magnetic cylinder (14) is present, and that the distance of the magnet (18) to the plant end face (11) by the adjusting device (26) is variable. 5. Pneumatically operated device according to claim 4, characterized in that the magnetic cylinder (14) has at least one receiving bore (20) in which a with the magnet (18) connected to the fastening element (19), in particular a fastening screw is axially limited slidably guided, and that the magnet (18) against the action of at least one compression spring (24) by engagement of the adjusting device (26) with the fastening element (19) or the magnet (18) in a desired distance to the contact end face (17) of the magnetic cylinder (14) brought is. 6. A pneumatically operated device according to claim 4 or 5, characterized in that the holding device (25) has four preferably cylindrical magnets (18) which are received in four equidistant from each other about the longitudinal axis of the magnetic cylinder (14) arranged receiving recesses (16), in that the magnets (18) are held axially displaceable by fastening screws (19) engaging in them, the fastening screws (19) extending through corresponding receiving bores (20) of the rear end wall (21) of the magnetic cylinder (14), in particular in spacer sleeves (23) against the action of compression springs (24) are axially movable, which are each arranged around the spacer sleeves (23) and frictionally between the rear end wall (21) and a screw heads receiving screw holder (22) are arranged, and that the distance of all magnets (18 ) to the plant end face (17) at the same time by the engagement of the adjusting device (26) ver is nderbar. 7. Pneumatically operated device according to one of claims 1 to 6, characterized in that the pressure chamber (31) in the axial extension of the guide cylinder (2) disposed within a cylindrical connecting sleeve (3) is provided, whose upper end by a closure body (4) is closed, in the interior of which the control valve (33) is formed in particular in the form of a З / 2-way valve and whose closed lower end has a pressure bore (34) which connects the pressure chamber (31) with the interior of the guide cylinder (2). 8. pneumatically operated device according to claim 7, characterized in that the magnetic cylinder (14) between the connecting sleeve (3) and the guide cylinder (2) arranged as a connecting element serving with these tight and firmly connectable, wherein the rear end wall (21) of the Magnetic cylinder (14) with at least one pressure bore (34) provided lower end of the pressure chamber (31). 9. Pneumatically operated device according to one of claims 7 or 8, characterized in that the control valve (33) has a cylindrical valve control body (35) in a guide bore (36) by means of a deformation tool (7) and closure body (4) extending Shift rod (41) against a spring is axially displaceable, that in non-positive engagement of the deformation tool (7) with the workpiece to be machined under zurückbewegter position of the shift rod (41) of the valve control body (35) holds a closing cone (37) against spring force in a compressed air release position, whereby compressed air via a gas connection piece (32) passes into the guide bore (36) and the pressure chamber (31) via a supply channel (38) is pressurized, and that with released switching rod (41) of the valve control body (35) and the closing cone (37) in a closure position, whereby the guide bore (36) of the Druckluftq uelle separated and the pressure chamber (31) via a vent passage (39) is vented. 10. Pneumatically operated device according to one of claims 3 to 9, characterized in that the adjusting device (26) has a respect. The magnetic cylinder (14) axially displaceable adjusting member (27), in particular an adjusting nut (27 '), further comprising at least one Adjusting member, in particular an adjusting pin (28) between the adjusting member (27) and the fastening element (19) or the magnet (18) is provided and that by actuation of the adjusting member (27), the distance of the magnet (18) to the striking position in the striking piston ( 12) is infinitely adjustable between two positions. 11. A pneumatically operated device according to claim 10, characterized in that the adjusting nut (27 ') is a union nut and this is in engagement with a at the rear end of the closure body (4) formed thread that fernem two setting pins (28). lie in sealing engagement in axial guide bores (29) of the closure body (4) and are at their ends in engagement with the adjusting nut (27 ') and the screw holder (22) and that by a rotation of the adjusting nut (27') of / the Magnet / e (18) against the force of the compression springs (24) in their distance from the contact end face (17) of the magnetic cylinder (14) are variable. 12. A deliverable pneumatic device according to one of claims 1 to 11, characterized in that the device housing (1) consisting of guide cylinder (2) and guide sleeve (3) in a receiving guide, in particular a cylinder housing (50) is received axially movable, and in that the device housing (1) is continuously reciprocable between a rest position and a working position in which the deformation tool (7) is engaged with a workpiece to be machined by a drive device, whereby the pneumatic device is in particular in an automatic production line is integrable. 13. A deliverable pneumatic plastic deformation apparatus according to claim 12, characterized in that the end walls (51 ', 51 ") of the cylinder housing (50) are sealingly penetrated from both ends of the device housing (1) and that the device housing (1) has a radial extended area, in particular has a peripheral flange (53), which is sealingly fitting on the inner peripheral wall (517 of the cylinder housing (50) feasible and two annular pressure chambers (54,54 ') is formed, whereby at alternating pressurization of the pressure chambers (54,54') the device housing (1) between the working position and the rest position is movable.