FR2865422A1 - Soleplates relative movement regulating module for press or pneumatic actuation tool, has piston and piston body exerting resistance to movement of soleplates, during connection of soleplates - Google Patents

Abstract

The module has a piston moving in a piston body. The piston and the body are integrated with movable and fixed soleplates (41, 42) of a press or pneumatic activation tool. The piston and the body exert resistance to movement of the soleplates, during connection of the soleplates. The body has a guiding cavity (4) filled with oil (15), in its lower part. An independent claim is also included for a press or pneumatic actuation tool including a relative movement regulating module.

Description

The present invention relates to a displacement control module

  relative of two parts for a press or a pneumatically operated tool, and its use, particularly in the field of punching tools.

  Punching, in particular sheet metal elements or steel profiles, extruded aluminum or polymer material is generally performed by tools, operated by presses on which they can be directly mounted. These tools consist essentially of a frame consisting of two flanges, which are massive plates of great thickness, spaced apart from each other, on which are fixed on the one hand the holding elements of the object and of the other hand the punch itself, or punch, to drill or cut the object according to the shape of the hole, or the cut to obtain.

  The most frequently used presses for punching are pneumatic presses, the operating energy being supplied by a compressed air network present in almost all the workshops.

  There are also hydraulic presses, including an integrated group connected to the industrial electricity grid. Hydraulic presses are much more expensive than pneumatic presses, partly because of the mandatory safety devices for electrical devices, and partly because of the cost of the hydraulic unit required.

  However, users appreciate the progressivity of displacement brought by this hydraulic actuation. Indeed, the pneumatic press does not instantly have sufficient power to perform the operation, and it when it is triggered does so with a shock and a characteristic sound of detonation. By cons the hydraulic press allows the progression of the relative movement of the two parts at almost constant speed, irresistibly, the operation is done without shock or detonation.

  The object of the present invention is to overcome the drawbacks of pneumatic presses by associating them with a device which makes it possible to obtain a progressive and smooth movement of the two parts (soles) approaching each other. To this end, the invention relates to a module for regulating the relative displacement of two parts of a press or a tool with pneumatic actuation, with a view to a gradual and smooth approximation of said parts, characterized in that the module consists of a hydraulic damper, formed of a piston integral with one of the parts and a piston body secured to the other part, the damper exerting a resistance to movement of said parts, when bringing said parts together obtained by pressurizing the pneumatic actuator.

  Preferably, the press or the tool comprises a fixed part and a movable part, and the displacement takes place between this fixed part and this movable part, the body of the piston being advantageously secured to the fixed part and the integral piston of the moving part.

  For example, the displacement is carried out vertically between a fixed lower part and a movable upper part.

  The piston body is then formed, preferably, in its upper part of a flared section, and in its lower part of an oil filled guide cavity, in which the end of said piston moves, the dimensions of the cavity being adjusted to the diameter of said piston, so as to drive the oil towards the flared section of the piston body during the descent of the piston. Thus, the oil is somehow laminated between the piston and the guide cavity. The very low clearance (for example of the order of a hundredth or a few hundredths of a millimeter) existing in this zone of displacement, offers the oil a very small passage section, which causes a brake on the piston's downward movement.

  Advantageously, notches are provided at the inner upper periphery of the guide cavity in order to facilitate, after the raising of the piston, the return by gravity of the oil, which has reached the flared section of the piston body during the descent. said piston.

  According to a first embodiment of the invention, the piston corresponds to the lower end of the shaft of a pull press, a shaft protruding above the frame of the press and on which is fixed the moving part. to move, and in that the piston body is formed in the bottom part of the frame of said press.

  The tool is then placed on top of the pneumatic press called the pull press in which the shaft, protruding above the frame of the press, passes through the tool and pulls down the upper flange of this tool for perform the desired operation, for example, the punching operation of an object.

  In a second embodiment of the invention according to a first variant, the desired vertical displacement is effected between two parallel horizontal flanges of a tool, the piston being fixed under the upper flange and the piston body fixed on the lower flange. , this preferably in the central area of the soles.

  Attachment under or on the sole means a fixing at the inner faces of the soles, or partial anchoring within these soles, by any appropriate means.

  This embodiment is also advantageous for conventional presses say gooseneck, for example.

  According to a variant of the second embodiment of the invention, it is also possible for several pistons to be fixed under the upper sole and several corresponding piston bodies fixed on the lower sole.

  In this case, the modules are mounted instead of rings and guide columns, arranged between the upper and lower flanges, which form the guide system of conventional punching tools. Thus, said pistons and corresponding piston bodies constitute the system for guiding the relative displacement of the upper and lower flanges.

  The oil contained in the regulation module has the further advantage of considerably reducing friction; this is of great interest because the friction in conventional guiding systems absorbs a significant part of the power of the press.

  This variant also makes it possible to avoid any dislocation of the upper sole which then descends perfectly parallel to the lower sole.

  According to a third embodiment of the invention, the regulation module can be mounted coaxially with the shaft of a conventional press which exerts, by means of a press nose secured to the central shaft of said press, a push on the upper flange of a tool. In this case, the regulation module comprises a piston integral with the upper end of the press shaft, while the piston body is formed in a room, centrally recessed, fixed on the upper zone of the frame of said press. , on the outskirts of the tree.

  Preferably, the piston is annular in shape and penetrates into a piston body having a circular cavity.

  This embodiment is particularly advantageous for cases where it is not possible to include the module according to the invention between the soles of the tool. It is all the more interesting that such a module can be easily mounted on an existing conventional press.

  According to a fourth embodiment of the invention, the regulation module is mounted coaxially with the shaft of a pull press, said shaft traversing centrally the two flanges of the tool, the piston is integral with the upper flange and the piston body is formed in a room, recessed centrally, secured to the lower sole.

  Preferably, the piston is here also of annular shape and penetrates into a piston body having a circular cavity.

  In this embodiment, the regulation module advantageously replaces the guide columns between the two flanges. The piston body may be machined into or attached to the bottom flange. The part constituting the piston is fixed rigidly at the inner face, or inside, of the upper sole.

  This embodiment also makes it possible to considerably reduce the dislocation of the upper flange, due to the intrinsic rigidity of the press shaft, and the small clearance between the piston and the piston body.

  This embodiment also makes it possible to reduce the number of components of the tool, and thus to simplify the machining and assembly of its components. The size between the soles of the tool is greatly reduced, which facilitates the implementation of different workstations.

  The present invention also relates to a press or a pneumatically actuated tool incorporating a regulation module according to the invention for the relative displacement of two of their parts, and finds an interesting use in the field of punching.

  The invention will be better understood from the following description given by way of nonlimiting example with reference to the accompanying drawings, in which: FIG. 1 shows the operating principle of a regulation module according to the invention, FIG. 2 is a sectional view of a pull press incorporating a regulation module according to a first embodiment of the invention, FIGS. 3 and 4 are sectional views of a regulation module according to a second embodiment. of the invention, is a sectional view of a third embodiment of the regulation module of the invention, is a sectional view of a fourth embodiment of the regulation module according to the invention, is a view in section showing the positioning of the tool on the pulling press shown in Figure 2.

  Referring to Figure 1 which shows the operating principle of a control module according to the invention, a piston 1 T-shaped moves in the piston body 3 in a vertical movement. In Figure la, the piston is in a high position. In FIG. 1b, the piston 1 under the action of a downwardly directed force F descends into the piston body 3. As it descends, the central zone 2 of the piston slides in a cavity 4 formed in the lower part This cavity 4 is filled with oil 15. The section of the central zone of the piston is of calibrated dimension, that is to say, it adapts, with play, to the section. of the cavity 4 of the piston body. When the piston is lowered, the oil of the cavity 4 is slowly driven towards the flared section 5 of the piston body. When the force F is no longer present, the tool returns to its initial position by appropriate devices (spring or double-acting press for example). Notches 6 made at the upper periphery of the cavity 4 allow the oil, which has reached the flared zone 5 of the piston body, to descend into the cavity 4 by gravity, in a very short time. These Figure 6 Figure 6 Figure 7 notches 6 are shown rectangular, but can also be of various shapes.

  According to the embodiments of the invention presented below, the piston is secured to the movable part of a press or tool while the piston body is secured to the fixed part.

Example 1

  FIG. 2 shows a first embodiment of the regulation module according to the invention applied to a pull press. The press comprises a central shaft 7 movable vertically by sliding in the central recess of a frame 8 having chambers 9 communicating with a source of compressed air (arrival A). The frame 8 of the press is closed in its lower part by a bottom part 10, of large thickness, firmly attached to the frame with a tonic seal 12 to prevent oil leakage.

  In this bottom piece 10 is machined a central cavity 4, in the axis of the shaft 7 of the press. Under the action of the pressure of the air under pressure brought by the pipe A in the chambers 9, the plate 11 descends, driving down the shaft 7 secured to said plate, and the lower end of the shaft penetrates in the cavity 4. The oil 15 present in this cavity is forced up towards the flared portion 5 to the inner walls of the frame 8 of the press. When the supply of compressed air, through the pipe A, is interrupted, compressed air is sent via the pipe B into the chambers 16 between the plate 11 and a diaphragm 17; the pressure in the chambers 16 then raises the piston, here constituted by the shaft 7. The oil stored in the flared portion 5 then falls by gravity into the cavity 4, thanks to the notches 6 described above.

  Figure 7 shows a tool mounted on such a pull press, the tool 20 has a lower flange 41 resting on the top of the frame 8 of the press, and an upper flange 42. These two flanges 41, 42 horizontal and parallel, have a central through hole in which slides the upper projecting portion of the shaft 7 of the press. For the introduction of the tool 20, a clamping nut 23 placed on the protruding portion of the shaft 7, presses the tool on the top of the frame 8 of the press and allows the upper sole 42 to follow. the descent of the central shaft 7. Guiding columns 29 are provided between the two flanges 41, 42.

  The tool shown in Figure 7 is a punch, it has in this figure two workstations, one to the left of the shaft 7, the other right (not detailed). The punch 24 placed on a block 25 is secured to the upper flange 42 of the tool. A perforation profile 26 is inserted from the rear to abutments 27 and 28. As detailed in the description of FIG. 2, when the compressed air is sent into the chamber 9 of the press, the shaft 7 descends. , bringing with it the sole 42 downwards and thus the punch 24 which then perforate the upper portion of the section 26 placed in the tool.

Example 2

  FIGS. 3 and 4 show two variants of the second embodiment of the regulation module according to the invention. For the sake of clarity, only the lower flanges 21 and upper 22 of the tool are shown in these figures. The regulation module is in accordance with the block diagram presented in FIG.

  According to the first variant (FIG. 3), the regulation module is disposed in the center of the flanges, the piston 1 (here T-shaped) is integral with the upper flange 22 that is to be displaced, the piston body 3 is secured to the fixed lower sole 21 of the tool.

  FIG. 4 shows an example of a tool comprising two regulation modules 30 according to the second variant. The modules are slightly different from that of FIG. 3 in that the piston 1, which here is formed of a vertical cylinder anchored in the upper flange 22, descends into a piston body 3 which is anchored in the lower flange 21 and form a kind of ring, partially filled with oil 15. The piston body here comprises a cover 17.

  These regulation modules advantageously replace the guide columns that equip the conventional punching tools (usually two to four in number).

Example 3

  An example of the third embodiment of the regulation module according to the invention is shown in FIG.

  The regulation module is fixed via a piece 30 placed on the top of the frame 31 of the conventional press, by means of screws 33. The press comprises a central shaft 32 which protrudes above the frame 31. The recessed part 30 at its center is fixed at the periphery of this shaft 32; it is a cylindrical piece in which is formed, for example by machining, the piston body for receiving the piston 1 which has, in this embodiment, the shape of a ring. The annular piston 1 is formed in one piece with a cover 34 which protects the piston body by covering, and which is fixed by means of a screw 35 to the upper end of the shaft 32 of the press .

Example 4

  An example of the regulation module according to the fourth embodiment of the invention is shown in FIG.

  On the frame 44 of a conventional press, a tool 40 is arranged in a manner similar to the tool described in example 1 with reference to FIG. 7. That is to say that the two lower soles 41 and upper 42, horizontal and parallel, have a central through hole in which slides the upper projecting portion of the shaft 7 of the press. A clamping nut 23 presses the tool 40 on top of the frame 44 of the press, allowing the movable top plate 42 to follow the descent of the central shaft 7.

  As for example 1, the tool comprises in this figure 6 two punching workstations, one to the left of the shaft 7, the other to the right, shown with the same references as those of FIG. .

  According to this embodiment, the actual control module has a structure similar to that of Example 3 shown in Figure 5, in that it is coaxial with the shaft 7 of the press. The piston 1 is formed in one piece with a vertical cylindrical portion forming a sleeve 43 surrounding the shaft 7, and a circular horizontal portion 45 forming a cover.

  This cover portion 45 which is anchored in the upper flange, carries the annular piston 1 and overlaps to protect the piston body 46. The piston body 46 is also annular in shape and is anchored in the lower flange 41 of the tool. 40.

  Under the action of the pressure generated by the pneumatic source, the shaft 7 (shown here in the high position) of the press goes down, driving the nut 23, the upper sole 42, and the sleeve 43 downwards.

  Such an arrangement of the control module forming a sliding sleeve coaxial with the shaft 7 advantageously makes it possible to replace the existing guide columns on the conventional tools. By forming a single-column guiding and damping system, they also make it possible to free up space for the workstations, and to avoid the swaying of the upper soleplate and thus the problems of breakage of the punches on their dies.

  The stability of the upper sole, and therefore the maintenance of its parallelism with the lower sole, are in particular ensured by the T-shape of the coaxial sleeve which increases, even in the absence of the hydraulic control device described above, the height guide along the shaft of the press, rigid and perfectly vertical.

  The control modules according to the invention, such as those presented in the examples above, can be easily integrated into existing tools or presses. They allow damping the descent of the pneumatically actuated piston in a progressive and smooth movement of this piston and therefore the soles of the tool towards each other.

  The disadvantages associated with blows (vibrations, noise, etc.) being greatly reduced, the users can advantageously, thanks to the module according to the invention, widen the field of application of the pneumatic presses, and no longer be limited to corresponding powers. a few (4 or 5) tonnes applied only.

Claims (13)

  1. - Module for regulating the relative displacement of two parts (21, 22; 41, 42), a press or a tool with pneumatic actuation, with a view to a progressive and smooth approximation of said parts, characterized in that the module consists of a hydraulic damper, formed of a piston (1; 7) integral with one of the parts and a piston body (3; 10; 30; 46) integral with the other part, this damper exerting a resistance to movement of said parts, during the approximation of said parts obtained by pressurizing the pneumatic actuator.   2. - Control module according to claim 1, characterized in that said displacement is between a fixed part and a movable part, the piston body (3) being integral with the fixed part and the piston (1) integral with the moving part.   3. - Control module according to claim 2, characterized in that said displacement is carried out vertically between a fixed lower portion 20 and a movable upper portion.   4. - Control module according to claim 3, characterized in that the piston body (3) is formed in its upper part with a flared section (5), and in its lower part of a cavity (4) of oil-filled guide (15), in which the end of said piston (1) moves, the dimensions of the cavity (4) being adjusted to the diameter of said piston, so as to drive the oil (15) towards the flared section (5) of the piston body during the descent of the piston (1).   5. - Control module according to claim 4, characterized in that the piston corresponds to the lower end of the shaft (7) of a pull press, shaft projecting above the frame (8) of the press and on which is fixed the moving part to move, and in that the piston body (3) is formed in the bottom part (10) of the frame of said press.   6. - Control module according to claim 4, characterized in that the vertical displacement is effected between two parallel horizontal flanges of a tool, the piston (1) being fixed under the upper flange (22) and the piston body (3) being fixed on the lower sole (21), preferably in the central part of the soles.   7. - Control module according to claim 4, characterized in that the vertical displacement is effected between two parallel horizontal flanges of a tool, a plurality of pistons (1) being fixed under the upper flange (22) and a plurality of piston bodies. (3) corresponding fixed on the lower sole (21).   8. - Control module according to claim 7, characterized in that said pistons (1) and corresponding piston body (3) constitute the guide system of the relative displacement of the upper flanges (22) and lower (21).   9. - Control module according to claim 4, characterized in that it is mounted coaxially with the shaft (32) of a press exerting a thrust on the upper flange of a tool, the piston being secured to the upper end of the shaft (32) of the press and the piston body being formed in a part (30), centrally recessed, fixed on the upper zone of the frame (31) of said press, at the periphery of the shaft (32).   10. - Control module according to claim 6, characterized in that it is mounted coaxially with the shaft (7) of a pull press, said shaft (7) passing centrally through the two flanges (41, 42) of the tool, in that the piston is secured to the upper flange (42) and the piston body is formed in a room, centrally recessed, integral with the lower flange (41).   11. - Control module according to any one of claims 4 to 10, characterized in that notches (6) are formed at the inner upper periphery of the cavity (4) for guiding to facilitate, after the ascent of the piston (1), the return by gravity of the oil (15), reached in the flared section (5) of the piston body (3) during the descent of said piston.   12. - press or pneumatically actuated tool incorporating a module for regulating the relative displacement of two of their parts, according to any one of the preceding claims.   13. - Use of the module according to claims 1 to 11, or the press or tool according to claim 10 in the field of punching.