FR3009692A1 - DEVICE FORMING SLIDER FOR BINDING PRESS AND TOOLING OF BUTTON PRESS EQUIPPED WITH SUCH A DEVICE. - Google Patents

Abstract

The present invention relates to a slider device for stamping press and stamping press tooling equipped with such a device. According to the invention, the device is characterized in that the bilateral guiding means of the displacement in translation of the movable body (22) towards the sheet metal part comprise rollers (25) secured respectively to support elements (26) connected to the support (20) of the movable body (22) by means (36) for maintaining the rollers bearing on the movable body (22) and for controlling, by cooperating with lateral shapes (28) of this body, the transverse clearance guiding the movable body (22) during its approach and work runs. The invention finds application for stamping press tooling parts of motor vehicle bodies.

Description

The present invention relates to a slider device for stamping press tooling equipment equipped with such a slider. Figures 1 and 2 show schematically a stamping press tooling comprising an upper frame 1 vertically movable and provided with a cam 2 in the form of ramp inclined relative to the vertical and a fixed lower frame 3 on which is mounted to slide in rectilinear translation a slide 4, the movable body 5 carries a working tool 6 for performing technical operations on a sheet metal part P. The sliding in translation of the movable body 5 of the slider 4 is provided by a pad 7 [0003] In addition, the movable body 5 of the slider 4 is bilaterally guided relative to the lower frame 3 by two lateral slides 8 secured to the movable body 5 by fixing screws 9 and cooperating respectively with two lateral slides 10 located on either side of the slides 8 and secured to the lower frame 3 by fixing screws 11. [00 04] A cover 12 is fixed on the slides 10 by means of the fixing screws 11 and above the slideways 9 to retain the slide 4 on the lower frame 3. Thus, the cover 12 comprises two cover parts 12a, 12b extending parallel to the direction of movement of the movable body 5 on either side of the latter. The movable body 5 of the slider 4 comprises a ramped cam 13 of the same inclination as the cam 2 of the movable upper frame 1, the cam 13 having, integral therewith, a sliding pad 14. Where [...] the upper frame is lowered vertically from a high position, the cam 2 contacts the sliding pad 14 of the cam 13 of the movable body 5 to allow guided sliding of the body in a direction forming an angle of inclination relative to to a plane perpendicular to the direction of movement of the upper frame of the press tool, that is to say that the movable body 5 of the slide moves in this case in a horizontal direction to the sheet metal part P. The technical operation performed on the sheet metal part P by the working tool 6 is a punching operation, but it is understood that depending on the type of working tool carried by the movable body 5, the technical operation could for example, a cutting operation of the sheet metal part P. During its displacement in translation by the movable upper frame 1, the movable body 5 of the slider 4 makes an approach run of the sheet metal part P and a working stroke during which the working tool 6 performs a technical operation on the sheet metal part P, in this case a punching operation shown in Figure 1. Generally, the working stroke of the tool 6 corresponds at approximately 10% of the total stroke of this body from its retracted starting position of the approach run. Such a slide must be guided bilaterally with precision relative to the lower frame 3, especially during the working stroke requiring a relatively low clearance of the operating game, for example about 0.05 mm while a transverse operating clearance of the movable body 5, for example about 0.5 mm, is acceptable for proper operation of the slide during the approach run. The transverse or lateral clearance values of the slider 5 in particular during its working stroke require extremely precise machining of the various guide elements of the slider, in particular the lateral slides 8, 10 of the slider and the lower frame 3. to ensure proper operation of the slide under these conditions, it is necessary to carry out frequent maintenance operations during the life of the tooling. In addition, accidental seizures can occur during the operation of the slide, thus imposing a stop of the press line and, therefore, a production interruption, to solve this problem. The present invention aims to overcome the above drawback devices known sliders for stamping presses. For this purpose, according to the invention, the device forming a slide for stamping press comprising a movable body carrying a working tool to perform technical operations on a sheet metal part, the movable body being mounted to displacement controlled in translationally and bilaterally guided to a support to the sheet metal part following an approach stroke and a working stroke during which the working tool performs a technical operation on the sheet metal part, is characterized in that the bilateral guide means translational movement of the movable body to the sheet metal part comprise rollers located on either side of the movable body and which are respectively secured to support elements connected to the support of the movable body by means for holding the rollers in position. support on the movable body and control, in cooperation with lateral forms of the movable body, the transverse guide play of u moving body during its displacement in translation so as to reduce the transverse clearance during the working stroke of the moving body relative to the transverse clearance during the approach stroke of this body. Preferably, the lateral shapes of the movable body are formed by bosses and the holding and control means comprise elastically deformable members in the direction transverse to the direction of movement of the movable body and interposed on each side of the movable body. between the support elements of the guide rollers and a spar secured to the support of the moving body parallel to the direction of movement of the movable body, the elastically deformable members being integral with the spar so as to exert on the support elements a transversely shifting prestressing the latter in a transverse guiding clearance relative to the spar and maintaining the guide rollers bearing on a portion of each side of the movable body located outside the bosses during the approach stroke of the movable body and to allow the bosses, when contacting the guide rollers during the working run of u movable body, to move the support elements transversely to the spar by compressing the elastically deformable members to reduce the transverse play of guiding the movable body relative to the spar. Preferably, each elastically deformable member is a cylindrical spring housed in a countersink of the corresponding spar bearing on the corresponding support member and is retained trapped in the counterbore by means of control of expansion and compression of the cylindrical spring respectively determining the transverse guiding games during the approach and working races of the moving body. Advantageously, the control members comprise a screw passing through the spar and the cylindrical spring being anchored to the corresponding support member and whose head is embedded in a countersink of the spar opposite the housing bore of the cylindrical spring, the head of the screw bearing against the bottom of the countersink by the detent action of the cylindrical spring during the stroke of approach of the movable body so as to define the transverse play of guiding between two faces facing one of the another respectively of the spar and the support member, parallel to the direction of movement of the movable body, and the head of the screw being offset from the bottom of the countersink by the compression action of the cylindrical spring during the working stroke of the movable body so as to bring the two parallel faces substantially in abutment with one another to reduce the transverse guiding game. The control members further comprise a sleeve coaxially mounted around the screw having its ends bearing respectively on the support member and the head of the screw. [0017] Advantageously, the cylindrical spring is made of a polyurethane-based material. Preferably, each support member is in the form of a yoke whose branches transverse to the direction of movement of the movable body carry at least one guide roller and is housed in a substantially U-shaped groove formed in the transverse spar. to it and being able to slide in the groove transversely to it during the approach and working races of the moving body. Preferably, the movable body comprises along it two side plates, each having two bosses longitudinally spaced from one another and on which abut respectively the guide rollers of two support elements when of the approach stroke of the moving body. Advantageously, each guide roller is a needle sleeve. The invention also relates to stamping press tooling, characterized in that it comprises a slider device, as defined above, a movable part, such as an upper frame, carrying a cam that can cooperate with a conjugate cam of the movable body to allow a guided displacement in translation of the latter on its fixed support, such as a lower frame, to the sheet metal part and in a direction forming an inclination angle with respect to a plane perpendicular to the moving direction of the moving part for performing a technical operation on this piece by the working tool, such as a punching operation. The invention will be better understood, and other objects, features, details and advantages thereof will appear more clearly in the explanatory description which follows with reference to the accompanying schematic drawings given solely by way of illustrative example. an embodiment of the invention and in which: - Figure 1 is a schematic longitudinal sectional view of a stamping press tooling of the prior art; - Figure 2 is a cross-sectional view along the line II-II of Figure 1; FIG. 3 is a cross-sectional view similar to that of FIG. 2 and showing part of a stamping press stamping tooling according to the invention occupying an advanced working position; - Figure 4 is a top view along the arrow IV of Figure 3 without a protective cover and showing the slider device in the advanced position, when the slide of the press is lowered; - Figure 5 is a partial view of the slider device when the slide of the tool is in the retracted position; - Figure 6 is a top view similar to that of Figure 4 and showing the slider device in the retracted position, when the slider of the press is open; - Figure 7 is a front view along the arrow VII of Figure 6; - Figure 8 is a view similar to that of Figure 7 without the support elements of the guide rollers; - Figure 9 is a sectional view along the line IX-IX of Figure 8; - Figure 10 is a side view of a support member of at least one roller; - Figure 11 is a view along the arrow XI of Figure 10; and - Figure 12 is a top view of a bossed side plate of the slider device. Referring to Figures 3 to 12, reference numeral 20 designates a lower frame of a stamping press tool and on which is slidably mounted in rectilinear translation, a slider 21 whose movable body 22 is bilaterally guided relative to the fixed lower frame 20 as will be seen later. The movable body 22 of the slider 21 is slidably mounted on the lower frame 20 by means of a sliding shoe 23 integral with this frame. The movable body 22 is displaced in translation relative to the lower frame 20 by a vertically movable upper frame as described with reference to Figure 1, that is to say that the upper frame comprises a cam adapted to cooperate with a cam of the movable body 22 of the slider 21 to move the movable body 22 in the present case in a direction perpendicular to the vertical direction of movement of the upper frame, that is to say that the movable body 22 moves in a direction horizontal. The movable body 22 of elongated shape carries at its end opposite its displacement cam in translation a working tool 24 for performing technical operations on a sheet metal part P, in this case, punching operations. Thus, the movable body 22 has its cam cooperating with the cam of the mobile upper frame to allow sliding of the movable body 22 in the direction of the sheet metal part P from a retracted starting position of a race d approach of the movable body 22 to the sheet metal part P continuing with a working stroke during which the working tool 24 performs a technical operation on the sheet metal part P. According to the invention, the guide means bilateral translation of the translational movement of the movable body 22 comprise rollers 25 located on either side of the movable body 22 and which are respectively secured to support members 26 connected to the lower frame 20 by means 27 for holding the rollers in position. supporting each side of the movable body 22 and controlling, in cooperation with lateral shapes 28 of the movable body 22, the transverse play of guiding the movable body 22 during its displacement in translation towards the sheet metal part P so as to reduce this transverse clearance during the working stroke of the movable body 22 relative to the transverse clearance during the approach stroke of this body to the sheet metal part P. According to the variant embodiment preferred, the lateral shapes 28 of the movable body 22 are formed by bosses formed on two side plates 29 respectively fixed to the two lateral faces of the movable body 22 by fixing screws 29a through holes 30 of the plates 29 and anchored in the movable body 22. Each plate 29 comprises in this case two bosses 28 spaced apart from each other in the longitudinal direction of the movable body 22 and on which the rollers 25 of two support elements 26 situated on the same side of the plate 29. Thus, the distance separating two bosses 28 of the same plate 29 is substantially equal to the distance separating the two vertical axes 31 carrying the The guide rolls 25 of the two corresponding support members 26. One of the bosses 28 of each plate 29 is located at one end of the plate situated upstream of this plate with respect to the displacement of the movable body 22 towards the workpiece P. from its retracted position of Figure 6. Each support member 26 is a yoke-shaped body whose two parallel branches 32 arranged horizontally, that is to say perpendicular to the longitudinal direction of movement of the body mobile 22 of the slider 21, carry a vertical cylindrical axis 31 on which is rotatably mounted at least one guide roller 25. In this case, two guide rollers 25 are rotatably mounted on the axis 31 which is secured to the branches 32 of the support member 26 by two end circlips 33. Advantageously, each guide roller 25 may be constituted by a needle sleeve. The core 34 of the yoke body of the support member 26 comprises a central threaded hole 35 parallel to the two branches 32 and whose role will be explained later. The means 27 for maintaining the rollers resting on the side plates 29 of the movable body 22 and to control the transverse play of guiding this body during its approach and work strokes comprise elastically deformable members 36. transverse direction to the moving direction of the movable body 22. In this case, two elastically deformable members 36 are provided on each side of the movable body 22 of the slider 21 and are respectively interposed between two roller support members 25 and a spar 37 fixed to the fixed lower frame 20 by fixing screws 38. The two longitudinal members 37 extend parallel to the longitudinal direction of movement of the movable body 22 being arranged on either side of the plates 29 bosses 28. [0035 Two resiliently deformable members 36 located on the same side are respectively fixed in two longitudinally spaced counterbores 39 of the spar 37 of so as to respectively exert on the two associated support members 26, during the approach stroke of the movable body 22, a preload shifting transversely the two support members 26 in a transverse guide clearance relative to the spar while maintaining the rollers of Guiding 25 bears on the part of the corresponding plate 29 located outside the two bosses 28. [0036] In addition, during the working stroke of the movable body 22 of the slider 21, the rollers 25 of the support elements 26 are in contact with each other. bearing on the bosses 28 of the plates 29 to move transversely the support members 26 to their respective longitudinal members 37 by compressing the elastically deformable members 36 to reduce the transverse play of guiding the movable body 22 relative to the longitudinal members 37. [0037] Preferably, each resiliently deformable member 36 is a cylindrical spring made of a polyurethane material. Each cylindrical spring 36 is thus housed in its corresponding counterbore 39 of a spar 37 being supported on the face of the core 34 of the support member 36 extending parallel to the longitudinal direction of movement of the movable body 22 opposite the guide rollers 25. Each support element 26 is housed by its core 34 in a U-shaped groove 41 formed in the front face of the corresponding spar 37 facing the corresponding plate 29 to bosses 28. Each groove 41 extends perpendicular to the spar 37 or the longitudinal direction of movement of the movable body 22 opening into the upper portion of the corresponding spar 37. Thus, each support member 26 is supported by its underside on the lower flat face of connection of the parallel branches of the groove 41 and can slide in this groove in a direction transverse to the longitudinal direction of movement of the horn mobile ps 22, that is to say perpendicular to the spar 37. When the cylindrical springs 36 occupy their relaxed position of application of the guide rollers 25 on the parts of the plates 29 located outside the bosses 28 during the approach stroke of the movable body 22, the transverse clearance is defined between each face 40 of a support member 26 and the corresponding bottom face 42 of the associated groove 41 as is apparent from Figure 5. [0041] Each counterbore 39 is made in the bottom face 42 of the corresponding groove 41 and the cylindrical spring 36 is retained trapped in this counterbore by means of control of expansion and compression of this spring 36 respectively determining the transverse guiding games during races approach and work of the mobile body 22. Preferably, these control members comprise a screw 43 passing through a bore 37a of the corresponding spar coaxially with the counterbore 39 and the spring cylindrical 36 being anchored in the tapped hole 35 of the core 34 of the corresponding support member 26. The head 44 of the screw 43 is embedded in a counterbore 45 of the spar 37 opposite the countersink 39 of the cylindrical spring 36 , the head 44 of the screw 43 bearing, by means of a washer 46, at the bottom of the counterbore 45 by the detent action of the cylindrical spring 36 during the approach stroke of the movable body 22 so as to define the transverse guiding clearance between the two faces 40 of the support member 26 and 42 of the groove 41 [0043] The control members also comprise a sheath 47 mounted coaxially around each screw 43 while having its ends bearing respectively on the face 40 of the corresponding support member 26 and the head 44 of the screw 43 via the washer 46 [0044] In addition, each head 44 of a screw 43 is offset from the bottom of its corresponding counterbore 45 by the compression action of the ressor t cylindrical 36 during the working stroke of the movable body 22 so as to bring the faces 40,42 substantially supported on one another as shown in Figure 3 which shows that the gap between the washer 46 of the head 44 and the bottom of the counterbore 45 is substantially equal to the game. [0045] Two parts 12a, 12b of a cover 12 are fixed on the longitudinal members 37 on either side of the movable body 22 by the fixing screws 38 and 'extend parallel to the direction of movement of this body. The two parts 12a, 12b are located with a small clearance above respectively the two plates 29 to retain the movable body 22 resting on the sliding shoe 23. The operation of the slide device of the press tooling In part of the foregoing description and will now be explained in the position shown in FIGS. 5 and 6, the movable body 22 of the slider 21 occupies a retracted position of rest at which the guide rollers 25 are supported on the plates 29 outside the bosses 28 under the prestressing exerted by the springs 36, the rollers 25 of two of the support members 26 being supported on the plates 29 between the bosses 28 and the rollers 25 of the two other elements of bearing being in the vicinity of the ends of these plates situated on the right with respect to FIG. 6. To carry out a technical operation on the sheet metal part P, such as a spike 1, the upper frame 1 of FIG. 1 is lowered vertically in order to bring its cam 2 in sliding contact with the cam 13 of the slider 21, allowing the mobile body 22 of the latter to move towards the sheet metal part. P in a direction perpendicular to the direction of movement of the upper frame 1. [0049] The movable body 22 of the slider 21 is then guided bilaterally by the guide rollers 25 by moving relative to these rollers in rectilinear translation during a race. approach of the sheet metal part P during which the support members 26 undergo the transverse return force exerted by the deformable springs 36 to maintain the rollers bearing on the plates 29 of the movable body 22. During this approach run the transverse guide clearance is maintained at a predetermined value, for example about 0.5 mm. As shown in Figures 3 and 4, when the movable body 22 of the slider 21 reaches its working stroke during which the work tool performs the punching operation to the sheet metal part P, the bosses 28 of the plates 29 of the movable body 22 bear on the rollers 25 whose support members 26 are displaced transversely to the direction of movement of the movable body 22 against the restoring force of the springs 36 to compress the latter so as to bring about contact with each other the faces 40 of the support members 26 and 42 of the grooves 41 of the longitudinal members 37, thereby reducing the transverse guide clearance to an extremely small functional clearance, for example of about 0.05 mm . The invention described above allows a precise transverse guidance of the slider, low play, during the working stroke thereof where the work tool is in contact with the sheet metal part to work while ensuring an acceptable operation of the slide during the approach run with greater transverse clearance than that of the working stroke. Thus, the variation of transverse clearance of the slider from the approach stroke to the working stroke is effectively absorbed by the elastically deformable members. The advantages of the invention are as follows: it provides ease of machining and mounting of the slider and its surrounding elements of the press tooling; it considerably reduces the maintenance operations compared with the prior art which immobilized stamping press tooling, - it reduces any risk of accidental seizure immobilizing a complete press line for intervention on the slide, - it reduces the risks of causing damage in the press press tooling; stamping, - it allows a better operation of the slide since the transverse clearance thereof during the approach stroke representing 90% of its total stroke, is 0.5 mm instead of 0.05 mm, - it allows a reduction in the return forces of the slides resulting in: - a reduction in the power of these return springs (generally gas cylinders) and therefore their price, - a reduction in the size of the rears. reminder springs, therefore, an increased ease of design of stamping press tools, - a reduction in the effort required for damping at the end of the stroke of the slider, - a reduction of damping means in size, cost,. .., - a reduction of shocks on end stops and vibration phenomena, which improves the reliability of the stamping tooling.

Claims (10)

REVENDICATIONS1. A slitter device for a stamping press comprising a movable body (22) carrying a working tool (24) for performing operations on a sheet metal part (P), the movable body (22) being mounted with translational displacement and bilaterally guided to a support (20) to the sheet metal part (P) following an approach stroke and a working stroke during which the working tool (24) performs an operation on the sheet metal part (P), characterized in that the bilateral guiding means of the translational movement of the movable body (22) towards the sheet metal part (P) comprise rollers (25) located on either side of the movable body (22) and which are integral respectively of support elements (26) connected to the support (20) of the movable body (22) by means (36) for holding the rollers (25) in abutment with the movable body (22) and for controlling, in cooperation with lateral shapes (28) of the movable body (22), the transverse clearance for guiding the movable body (22) during its displacement in translation so as to reduce this transverse clearance during the working stroke of the movable body (22) relative to the transverse clearance during the approach stroke of this body. 2. Device according to claim 1, characterized in that the lateral shapes of the movable body are constituted by bosses (28) and the holding and control means comprise members (36) elastically deformable in the direction transverse to the direction of movement. of the movable body (22) and interposed, on each side of the movable body (22), between the support elements (26) of the guide rollers (25) and a longitudinal member (37) integral with the support (20) of the movable body ( 22) parallel to the direction of movement of the movable body (22), the elastically deformable members (36) being integral with the spar (37) so as to exert on the support elements (26) a prestress shifting transversely these following a set transverse guide relative to the beam (37) and maintaining the guide rollers (25) bearing on a part of each side of the movable body (22) located outside the bosses (28) during the race of a near the moving body (22) and allowing the bosses (28), when contacting the guide rollers (25) during the working stroke of the movable body (22), to move the support elements (26) transversely towards the spar (37) by compressing the elastically deformable members (36) to reduce the transverse guiding clearance of the movable body (22) relative to the spar (37). 3. Device according to claim 2, characterized in that each elastically deformable member is a cylindrical spring (36) housed in a recess (39) dulongeron corresponding (37) bearing on the corresponding support member (26) and is retained trapped in the countersink (39) by members (43,47) of control of expansion and compression of the cylindrical spring (36) respectively determining the transverse guiding games during the approach and working strokes of the moving body ( 22). 4. Device according to claim 3, characterized in that the control members comprise a screw (43) passing through the spar (37) and the cylindrical spring (36) being anchored to the corresponding support member (26) and the head (44) is embedded in a countersink (45) of the spar (37) opposite the housing counter (39) of the cylindrical spring (36), the head (44) of the screw (43) bearing against the bottom of the countersink (45) by the detent action of the cylindrical spring (36) during the approach stroke of the movable body (22) so as to define the transverse guiding clearance between two faces facing each other (42,40) respectively of the spar (37) and the support member (26), parallel to the direction of movement of the movable body (22) and the head (44) of the screw (43) being offset from the bottom of the counterbore (45) by the compression action of the cylindrical spring (36) during the working stroke of the movable body (22) so as to bring the two faces closer together releasers (40,42) substantially supported on each other to reduce the transverse guide clearance. 5. Device according to claim 4, characterized in that the control members further comprise sheath (47) mounted coaxially around the screw (43) having its ends bearing respectively on the support member (26) and the head (44) of the screw 20 (43). 6. Device according to claim 4 or 5, characterized in that the cylindrical spring (36) is made of a polyurethane material. 7. Device according to one of claims 2 to 6, characterized in that each support member (26) is in the form of a yoke whose branches (32) transverse to the direction of movement of the movable body (22). carry at least one horizontal guide roller (25) and is housed in a substantially U-shaped groove formed in the spar (37) transversely thereto and slidable in the groove transversely thereto during the approach strokes and working body (22). 8. Device according to one of claims 2 to 7, characterized in that the movable body (22) comprises along it two side plates (29), each having two bosses (28) longitudinally spaced one on the other and on which support respectively the guide rollers (25) of two support members (26) during the approach stroke of the movable body (22). 9. Device according to one of claims 1 to 8, characterized in that each guide roller (25) is a needle sleeve. 10. Tooling forming a stamping press, characterized in that it comprises a slider device (21), as defined in any one of claims 1 to 9, a movable part (1), such as a frame upper, carrying a cam (2) engageable with a conjugate cam (13) of the movable body (22) to allow a translation-guided displacement of the latter on its fixed support (20), such as a fixed lower frame, to the sheet metal part (P) and in a direction forming an inclination angle with respect to a plane perpendicular to the direction of movement of the movable part (1) to perform an operation on this part by the working tool (24). ), such as a punching operation.