EP3311931B1 - Tool locking device for a machine tool, particularly for a folding press - Google Patents
Tool locking device for a machine tool, particularly for a folding press Download PDFInfo
- Publication number
- EP3311931B1 EP3311931B1 EP17197771.3A EP17197771A EP3311931B1 EP 3311931 B1 EP3311931 B1 EP 3311931B1 EP 17197771 A EP17197771 A EP 17197771A EP 3311931 B1 EP3311931 B1 EP 3311931B1
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- EP
- European Patent Office
- Prior art keywords
- locking
- tool
- lamina
- locking device
- bodies
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000463 material Substances 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 239000002436 steel type Substances 0.000 claims description 2
- 230000000284 resting effect Effects 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0209—Tools therefor
- B21D5/0236—Tool clamping
- B21D5/0245—Fluid operated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
- B21D5/02—Bending sheet metal along straight lines, e.g. to form simple curves on press brakes without making use of clamping means
- B21D5/0209—Tools therefor
- B21D5/0236—Tool clamping
Definitions
- the present invention refers to a locking device of tools in a machine tool, particularly of the folding press type, according to the preamble of claim 1 (see for example EP-B1-1 662 731 ).
- folding presses are commonly used.
- Folding presses generally comprise a lower base block that defines a fixed support plane of the sheet to be processed. Such a support plane is provided with a folding template, or matrix, according to the profile of which the sheet must be folded. Folding presses also comprise a slide, mobile along a direction perpendicular to the support plane of the sheet to be processed, with which a folding tool is associated, like for example a punch, which, cooperating with the folding template beneath the sheet, gives the desired folding to the sheet.
- a folding tool like for example a punch
- the movement of the slide is generated by an electromechanical or hydraulic control device that provides the force necessary to fold the sheet.
- the folding tool has a first work end, profiled so as to cooperate with the folding template arranged on the fixed support plane, and a second end, for locking to the slide.
- the folding press generally comprises locking means of the folding tool to the mobile slide, which can for example consist of a clamp that grips and locks in position the locking end of the tool with respect to the slide.
- folding tools of a folding press are interchangeable since their size, in terms of height and length, as well as the geometry of the work end, can vary according to the folding profile to be made.
- the folding tools can have variable lengths, generally greater than 20 millimetres and can be put near each other in the slide, to define a folding line having a desired overall length.
- the composition of the folding press is made up of a plurality of fractioned tools of reduced length, which make the folding line of the desired length.
- the aforementioned known folding presses are not without drawbacks, including the fact that the locking devices of the tools present on such presses do not ensure a continuity of positioning of the tools and a repeatability of the folds on the sheets being processed, in particular in the case in which the folding presses have variously fractioned tools, i.e. of different lengths, put near each other.
- the main purpose of the present invention is to make a locking device of tools in a machine tool that ensures optimal, precise and homogeneously distributed locking of all of the tools associated with the machine tool, and in particular in the case in which such tools are of the fractioned type.
- Another purpose of the present invention is to make a locking device that allows the tools to be locked firmly and precisely irrespective of the shape and size thereof.
- Another purpose of the present invention is to make a locking device that ensures high locking forces of the tools.
- Another purpose of the present invention is to make a locking device that is particularly simple and functional, with low costs.
- the locking device of tools in a machine tool globally indicated with reference numeral 1, comprises:
- At least one lamina 13 is interposed that is configured to transmit a locking thrust from the mobile piston 11 to the plurality of locking bodies 9 and to move such a plurality of locking bodies 9 along the action direction 90 from the disengaged position to the engagement position with the tool 7.
- the locking device 1 advantageously comprises, between the base body 3 and the lamina 13, elastic abutment means 15.
- Such elastic abutment means 15 are configured to push the lamina 13 along the action direction 90.
- the lamina 13 is configured to transmit an unlocking thrust to the plurality of locking bodies 9 and to move such a plurality of locking bodies 9 along the action direction 90 from the engagement position to the disengaged position with the tool 7.
- the elastic abutment means 15 can comprise a plurality of springs 150 housed in corresponding seats 31 formed in the base body 3.
- figure 2 The engagement position of the locking bodies 9 with the tool 7 is illustrated in figure 2 , whereas figure 1 illustrates the disengaged position of the locking bodies 9 with the tool 7.
- the locking bodies 9 are axially movable inside corresponding cylindrical seats 30 formed in the base body 3.
- such cylindrical seats 30 housing the locking bodies 9 communicate with the seat 5 where the tool 7 is inserted.
- a locking portion 92 of the locking body 9 can project inside the seat 5 to lock the tool 7 inside the seat itself.
- the locking portion 92 of the locking body 9 can be defined by a projecting structure 93, preferably substantially V-shaped, capable of cooperating with the tool 7, as described hereinafter, to carry out the locking thereof inside the seat 5 of the locking device 1.
- the tool 7 indeed comprises an operative end, not illustrated in the attached figures, which carries out the folding of the sheet, and a locking end 70 intended to be inserted and locked in the seat 5 of the locking device 1.
- the tool 7 has at least one substantially V-shaped lateral seat 71, which is intended to receive the projecting structure 93 of the locking body 9 to carry out the locking thereof inside the seat 5.
- the projecting structure 93 inserts into the corresponding V-shaped lateral seat 71 of the tool 7 and determines both the displacement of the tool 7 towards the bottom of the seat 5, i.e. in an upward vertical direction, and its locking in the transversal direction, i.e. in a horizontal direction towards the wall of the seat 5 opposite to the locking body 9.
- the tool 7 there can be a pair of opposite V-shaped lateral seats 71.
- the lamina 13 engages with a first portion 17 of each of the locking bodies 9 to transmit the locking thrust and with a second portion 19 of each of the locking bodies 9, distinct from such a first portion 17, to transmit the unlocking thrust.
- the aforementioned first portion 17 of the locking body 9 is defined by a cylindrical or spherical surface.
- the lamina 13 presses against the cylindrical (or spherical) portion 17 of the locking body 9, along a line (or a point) of contact and tangential thrust S, schematically highlighted in figures 2 and 5 , generating an axial thrust of the locking body 9 inside its own cylindrical seat 30, as better explained hereinafter.
- the second portion 19 of the locking body 9 is defined by a radial recess 21 formed in the locking body 9 itself, in which radial recess 21 a portion 23 of the lamina 13 is inserted.
- the mobile piston 11 of the locking device 1 is advantageously actuated pneumatically, for example through the use of air compressed to a work pressure substantially comprised between 5 and 10 bar and preferably comprised between 6 and 8 bar.
- the locking bodies 9 are distributed along a work direction 25 substantially perpendicular to the action direction 90.
- the lamina 13 advantageously has an elongated shape in such a work direction 25 so as to engage with the locking bodies 9.
- the mobile piston 11 also has an elongated shape in the work direction 25 and rests on the lamina 13.
- the mobile piston 11 advantageously has a substantially elliptical elongated shape, or a substantially rectangular elongated shape, preferably with rounded vertices or with the short sides in the shape of a semi-circle.
- the mobile piston 11 advantageously has a so-called slot shape.
- the elongated shape of the mobile piston 11 provides a large thrusting surface and therefore makes it possible to use relatively low work pressures and therefore to use compressed air systems.
- the locking device 1 is advantageously configured to lock a plurality of variously fractioned tools 7.
- the lamina 13 is made of a material of the steel type capable of flexing elastically to exert a substantially homogeneous locking thrust on all of the variously fractioned tools 7 present in the locking device 10.
- the locking device 1 is therefore configured to lock tools 7 of various type and size.
- the locking device 1 is suitable for locking both a monolithic tool 7 having a certain length, and a plurality of fractioned tools 7, each having a reduced length, where such fractioned tools 7 can be put together near each other to define a tool group having a certain length.
- the locking device 1 can comprise a plurality of mobile pistons 11, adjacent to one another, so as to cover substantially the entire length of the base body 3, which has a length substantially equal to the length of the folding press.
- Every mobile piston 11 is housed inside a cap 16, in which the chamber 12 is defined inside which the mobile piston 11 moves.
- the tool 7 can comprise, at the locking end 70, at least one button 72 adapted for actuating a tooth 73, or a rigid metallic pin, which makes it possible to temporarily fasten the tool 7 in the seat 5 of the base body 3 before the stable locking through the locking bodies 9.
- the tooth 73 of the tool 7 inserts in corresponding seats 33 formed in the base body 3 radially inside the housing seat 5 of the tool 7.
- the lamina 13 can comprise a portion 130 configured to go into abutment against an abutment surface 35 of the base body 3.
- a portion 130 is advantageously folded with respect to the lying plane of the lamina 13 so that, abutting against the abutment surface 35, a rotation point R of the lamina 13 with respect to the abutment surface 35 is defined, as better described hereinafter.
- the locking body 9 comprises a cylindrical body 95 at an axial end of which the locking portion 92 defined by the projecting structure 93 is formed.
- cylindrical body 95 At the opposite end of the cylindrical body 95 there is the cylindrical portion 17, intended to come into contact with the lamina 13 in the thrusting step of the locking body 9. At such an end of the cylindrical body 95 a further projecting body 96 is also formed, in which the recess 21 is defined for the engagement with the portion 23 of the lamina 13 in the pulling back step of the locking body 9.
- the present invention also concerns a folding press equipped with a locking device of tools as described above.
- Figure 1 illustrates the tool 7 inserted in the seat 5 of the base body 3, with its V-shaped lateral seat 71 substantially facing the cylindrical seat 30 formed in the base body 3, and thus substantially facing the locking portion 92 of the locking body 9 that is housed in such a cylindrical seat 30.
- the pneumatic actuation of the mobile piston 11, by means of the compressed air injected into the chamber 12 determines an axial displacement, substantially along the direction 14, of the mobile piston 11, which thrusts the lamina 13.
- the lamina 13 thus goes into abutment both against the abutment surface 35 at the rotation point R, and against the cylindrical (or spherical) portion 17 of the locking body 9, along the contact and thrusting line S (or contact and thrusting points in the case of a spherical shape of the portion 17 of the locking body 9).
- the mobile piston 11, exerting its thrust against the lamina 13, can also go slightly off its axis, as can be seen in figure 2 , where the axis 110 of the piston 11 is slightly inclined with respect to the axial direction 14.
- the slight rotation of the mobile piston 11 is foreseen and permitted since the use of low pressures of the air allows sliding couplings between the various components of the locking device 1 with a relative mutual clearance.
- the lamina 13 thus hinges at the rotation point R and thrusts the locking body 9 at the contact and thrusting line S, ensuring that, irrespective of the possible inclination of the lamina 13 with respect to the axis of the locking body 9, coinciding with the action direction 90, the thrust that the lamina 13 exerts on the locking body 9 is always transmitted in such an action direction 90, avoiding jamming or mutual sliding between the components that are disadvantageous in terms of the mutual contact and friction forces that could be generated.
- the movement of the locking body 9 along the action direction 90 ensures that the locking portion 92 projects in the seat 5 of the tool and, as already described, locks the tool 7 inside its seat 5.
- the elastic abutment means 15 are capable of taking the lamina 13, and with it the mobile piston 11, into the starting position.
- the lamina 13 in its backward movement, pulls the locking body 9 with it, since its portion 23, inserted in the recess 21 formed in the locking body 9, thrusts, at the area indicated with T in figure 1 , the locking body 9, allowing the tool 7 to be freed from the seat 5.
- the locking device achieves the predetermined purposes since it makes it possible to ensure a firm and stable locking of the tools in the folding press, also in the case of different and variously fractioned tools.
- the lamina present in the locking device indeed, thanks to its elastic deformation ability, makes it possible to exert a homogeneous thrust on all of the locking bodies, also in the case in which the various fractioned tools have different constructive tolerances from one another. In this way, the correct positioning in the folding press of tools of different shapes and lengths is always ensured.
- Yet another advantage of the locking device consists of the fact that it can be actuated with compressed air pneumatic systems, instead of known hydraulic systems.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
Description
- The present invention refers to a locking device of tools in a machine tool, particularly of the folding press type, according to the preamble of claim 1 (see for example
EP-B1-1 662 731 ). - For cold plastic processing, through folding of sheeted pieces, folding presses are commonly used.
- Folding presses generally comprise a lower base block that defines a fixed support plane of the sheet to be processed. Such a support plane is provided with a folding template, or matrix, according to the profile of which the sheet must be folded. Folding presses also comprise a slide, mobile along a direction perpendicular to the support plane of the sheet to be processed, with which a folding tool is associated, like for example a punch, which, cooperating with the folding template beneath the sheet, gives the desired folding to the sheet.
- The movement of the slide is generated by an electromechanical or hydraulic control device that provides the force necessary to fold the sheet.
- Generally, the folding tool has a first work end, profiled so as to cooperate with the folding template arranged on the fixed support plane, and a second end, for locking to the slide.
- The folding press generally comprises locking means of the folding tool to the mobile slide, which can for example consist of a clamp that grips and locks in position the locking end of the tool with respect to the slide.
- The folding tools of a folding press are interchangeable since their size, in terms of height and length, as well as the geometry of the work end, can vary according to the folding profile to be made.
- In particular, the folding tools can have variable lengths, generally greater than 20 millimetres and can be put near each other in the slide, to define a folding line having a desired overall length. In this case, the composition of the folding press is made up of a plurality of fractioned tools of reduced length, which make the folding line of the desired length.
- The aforementioned known folding presses are not without drawbacks, including the fact that the locking devices of the tools present on such presses do not ensure a continuity of positioning of the tools and a repeatability of the folds on the sheets being processed, in particular in the case in which the folding presses have variously fractioned tools, i.e. of different lengths, put near each other.
- The main purpose of the present invention is to make a locking device of tools in a machine tool that ensures optimal, precise and homogeneously distributed locking of all of the tools associated with the machine tool, and in particular in the case in which such tools are of the fractioned type.
- Another purpose of the present invention is to make a locking device that allows the tools to be locked firmly and precisely irrespective of the shape and size thereof.
- Another purpose of the present invention is to make a locking device that ensures high locking forces of the tools.
- Another purpose of the present invention is to make a locking device that is particularly simple and functional, with low costs.
- These purposes according to the present invention are accomplished by making a locking device of tools in a machine tool, particularly of the folding press type, as outlined in
claim 1. - Further preferred characteristics of the locking device are provided for in the dependent claims.
- The characteristics and advantages of a locking device of a tool in a machine tool, according to the present invention will become clearer from the following description, given as an example and not for limiting purposes, referring to the attached schematic drawings, in which:
-
figure 1 is a schematic side view of a locking device of a tool in a machine tool, according to a preferred embodiment of the invention, illustrated in an unlocking configuration of the tool; -
figure 2 is a schematic side view of the locking device offigure 1 , according to said preferred embodiment of the invention, illustrated in a locking configuration of the tool; -
figure 3 is a schematic side view of some components of the locking device offigure 1 , according to a preferred embodiment of the invention; -
figure 4 is a section view of the locking device as represented infigure 3 , carried out according to the axis IV-IV; -
figure 5 is a side view from the right of the locking device as represented infigure 3 ; -
figure 6 is a perspective view of a locking body of the locking device offigure 1 , according to a preferred embodiment of the invention; -
figures 7 to 10 are respective front, side, rear and plan views from above of the locking body illustrated infigure 6 . - With reference to the figures, the locking device of tools in a machine tool, globally indicated with
reference numeral 1, comprises: - a
base body 3 provided with at least oneinsertion seat 5 for at least onetool 7; - a plurality of
locking bodies 9 movable along anaction direction 90 between an engagement position with thetool 7, to lock it inside theseat 5, and a disengaged position with thetool 7, to free it from theseat 5; - at least one
mobile piston 11 able to be actuated to move the plurality oflocking bodies 9 along theaction direction 90 from the disengaged position to the engagement position with thetool 7. - According to the invention, between the
piston 11 and the plurality oflocking bodies 9 at least onelamina 13 is interposed that is configured to transmit a locking thrust from themobile piston 11 to the plurality oflocking bodies 9 and to move such a plurality oflocking bodies 9 along theaction direction 90 from the disengaged position to the engagement position with thetool 7. - The
locking device 1 advantageously comprises, between thebase body 3 and thelamina 13, elastic abutment means 15. Such elastic abutment means 15 are configured to push thelamina 13 along theaction direction 90. Thelamina 13 is configured to transmit an unlocking thrust to the plurality oflocking bodies 9 and to move such a plurality oflocking bodies 9 along theaction direction 90 from the engagement position to the disengaged position with thetool 7. - The elastic abutment means 15 can comprise a plurality of
springs 150 housed incorresponding seats 31 formed in thebase body 3. - The engagement position of the
locking bodies 9 with thetool 7 is illustrated infigure 2 , whereasfigure 1 illustrates the disengaged position of thelocking bodies 9 with thetool 7. - The
locking bodies 9 are axially movable inside correspondingcylindrical seats 30 formed in thebase body 3. - Advantageously, such
cylindrical seats 30 housing thelocking bodies 9 communicate with theseat 5 where thetool 7 is inserted. - In this way a
locking portion 92 of thelocking body 9 can project inside theseat 5 to lock thetool 7 inside the seat itself. - The
locking portion 92 of thelocking body 9 can be defined by aprojecting structure 93, preferably substantially V-shaped, capable of cooperating with thetool 7, as described hereinafter, to carry out the locking thereof inside theseat 5 of thelocking device 1. - The
tool 7 indeed comprises an operative end, not illustrated in the attached figures, which carries out the folding of the sheet, and alocking end 70 intended to be inserted and locked in theseat 5 of thelocking device 1. - Advantageously, at the
locking end 70, thetool 7 has at least one substantially V-shapedlateral seat 71, which is intended to receive theprojecting structure 93 of thelocking body 9 to carry out the locking thereof inside theseat 5. - As illustrated in
figure 2 , in the engagement position of thelocking body 9 with thetool 7, theprojecting structure 93 inserts into the corresponding V-shapedlateral seat 71 of thetool 7 and determines both the displacement of thetool 7 towards the bottom of theseat 5, i.e. in an upward vertical direction, and its locking in the transversal direction, i.e. in a horizontal direction towards the wall of theseat 5 opposite to thelocking body 9. - The fact that the
projecting structure 93 of thelocking body 9 and the V-shapedlateral seat 71 of thetool 7 have inclined faces facing each other allows to simultaneously generate an upward thrust of thetool 7 inside theseat 5, which makes it possible to align it with the bottom of such aseat 5 and a thrust in the horizontal direction of thetool 7 inside theseat 5, which also allows it to be aligned frontally. - Preferably, in the
tool 7 there can be a pair of opposite V-shapedlateral seats 71. - Advantageously, the
lamina 13 engages with afirst portion 17 of each of thelocking bodies 9 to transmit the locking thrust and with asecond portion 19 of each of thelocking bodies 9, distinct from such afirst portion 17, to transmit the unlocking thrust. - Advantageously, the aforementioned
first portion 17 of thelocking body 9 is defined by a cylindrical or spherical surface. - In this way, through the effect of the locking thrust applied by the
mobile piston 11, thelamina 13 presses against the cylindrical (or spherical)portion 17 of thelocking body 9, along a line (or a point) of contact and tangential thrust S, schematically highlighted infigures 2 and5 , generating an axial thrust of thelocking body 9 inside its owncylindrical seat 30, as better explained hereinafter. - Advantageously, the
second portion 19 of thelocking body 9 is defined by aradial recess 21 formed in thelocking body 9 itself, in which radial recess 21 aportion 23 of thelamina 13 is inserted. - In this way, when the
mobile piston 11 stops exerting the locking thrust against thelamina 13, the elastic abutment means 15 thrust thelamina 13 in the opposite direction, and thelamina 13, engaging with itsportion 23 in therecess 21 of thelocking body 9 pulls the latter from the engagement position with thetool 7 illustrated infigure 2 , to the disengaged position illustrated infigure 1 , freeing thetool 7 from theseat 5. - The
mobile piston 11 of thelocking device 1 is advantageously actuated pneumatically, for example through the use of air compressed to a work pressure substantially comprised between 5 and 10 bar and preferably comprised between 6 and 8 bar. - Advantageously, as illustrated in
figures 4 and5 , thelocking bodies 9 are distributed along awork direction 25 substantially perpendicular to theaction direction 90. Thelamina 13 advantageously has an elongated shape in such awork direction 25 so as to engage with thelocking bodies 9. Themobile piston 11 also has an elongated shape in thework direction 25 and rests on thelamina 13. - The
mobile piston 11 advantageously has a substantially elliptical elongated shape, or a substantially rectangular elongated shape, preferably with rounded vertices or with the short sides in the shape of a semi-circle. Themobile piston 11 advantageously has a so-called slot shape. - The elongated shape of the
mobile piston 11 provides a large thrusting surface and therefore makes it possible to use relatively low work pressures and therefore to use compressed air systems. - The
locking device 1 is advantageously configured to lock a plurality of variously fractionedtools 7. Thelamina 13 is made of a material of the steel type capable of flexing elastically to exert a substantially homogeneous locking thrust on all of the variously fractionedtools 7 present in the locking device 10. - The
locking device 1 is therefore configured to locktools 7 of various type and size. - For example, the
locking device 1 is suitable for locking both amonolithic tool 7 having a certain length, and a plurality of fractionedtools 7, each having a reduced length, where such fractionedtools 7 can be put together near each other to define a tool group having a certain length. - As illustrated in
figure 5 , thelocking device 1 can comprise a plurality ofmobile pistons 11, adjacent to one another, so as to cover substantially the entire length of thebase body 3, which has a length substantially equal to the length of the folding press. - Every
mobile piston 11 is housed inside acap 16, in which thechamber 12 is defined inside which themobile piston 11 moves. - Advantageously, the
tool 7 can comprise, at thelocking end 70, at least onebutton 72 adapted for actuating atooth 73, or a rigid metallic pin, which makes it possible to temporarily fasten thetool 7 in theseat 5 of thebase body 3 before the stable locking through thelocking bodies 9. Advantageously, thetooth 73 of thetool 7 inserts incorresponding seats 33 formed in thebase body 3 radially inside thehousing seat 5 of thetool 7. - The
lamina 13 can comprise aportion 130 configured to go into abutment against anabutment surface 35 of thebase body 3. Such aportion 130 is advantageously folded with respect to the lying plane of thelamina 13 so that, abutting against theabutment surface 35, a rotation point R of thelamina 13 with respect to theabutment surface 35 is defined, as better described hereinafter. - A preferred, but not exclusive embodiment of the locking
body 9 is illustrated infigures 6 to 10 . According to such an embodiment, the lockingbody 9 comprises acylindrical body 95 at an axial end of which the lockingportion 92 defined by the projectingstructure 93 is formed. - At the opposite end of the
cylindrical body 95 there is thecylindrical portion 17, intended to come into contact with thelamina 13 in the thrusting step of the lockingbody 9. At such an end of the cylindrical body 95 a further projectingbody 96 is also formed, in which therecess 21 is defined for the engagement with theportion 23 of thelamina 13 in the pulling back step of the lockingbody 9. - The present invention also concerns a folding press equipped with a locking device of tools as described above.
- The operation of the
locking device 1 is described hereinafter with reference tofigures 1 and 2 . -
Figure 1 illustrates thetool 7 inserted in theseat 5 of thebase body 3, with its V-shapedlateral seat 71 substantially facing thecylindrical seat 30 formed in thebase body 3, and thus substantially facing the lockingportion 92 of the lockingbody 9 that is housed in such acylindrical seat 30. - The pneumatic actuation of the
mobile piston 11, by means of the compressed air injected into thechamber 12 determines an axial displacement, substantially along thedirection 14, of themobile piston 11, which thrusts thelamina 13. Thelamina 13 thus goes into abutment both against theabutment surface 35 at the rotation point R, and against the cylindrical (or spherical)portion 17 of the lockingbody 9, along the contact and thrusting line S (or contact and thrusting points in the case of a spherical shape of theportion 17 of the locking body 9). - The
mobile piston 11, exerting its thrust against thelamina 13, can also go slightly off its axis, as can be seen infigure 2 , where theaxis 110 of thepiston 11 is slightly inclined with respect to theaxial direction 14. The slight rotation of themobile piston 11 is foreseen and permitted since the use of low pressures of the air allows sliding couplings between the various components of thelocking device 1 with a relative mutual clearance. - The
lamina 13 thus hinges at the rotation point R and thrusts the lockingbody 9 at the contact and thrusting line S, ensuring that, irrespective of the possible inclination of thelamina 13 with respect to the axis of the lockingbody 9, coinciding with theaction direction 90, the thrust that thelamina 13 exerts on the lockingbody 9 is always transmitted in such anaction direction 90, avoiding jamming or mutual sliding between the components that are disadvantageous in terms of the mutual contact and friction forces that could be generated. - The movement of the locking
body 9 along theaction direction 90 ensures that the lockingportion 92 projects in theseat 5 of the tool and, as already described, locks thetool 7 inside itsseat 5. - When the pressure of the air in the
chamber 12 is lowered, the elastic abutment means 15 are capable of taking thelamina 13, and with it themobile piston 11, into the starting position. - In particular, the
lamina 13, in its backward movement, pulls the lockingbody 9 with it, since itsportion 23, inserted in therecess 21 formed in the lockingbody 9, thrusts, at the area indicated with T infigure 1 , the lockingbody 9, allowing thetool 7 to be freed from theseat 5. - In practice, it has been seen how the locking device, according to the present invention, achieves the predetermined purposes since it makes it possible to ensure a firm and stable locking of the tools in the folding press, also in the case of different and variously fractioned tools.
- The lamina present in the locking device, indeed, thanks to its elastic deformation ability, makes it possible to exert a homogeneous thrust on all of the locking bodies, also in the case in which the various fractioned tools have different constructive tolerances from one another. In this way, the correct positioning in the folding press of tools of different shapes and lengths is always ensured.
- Yet another advantage of the locking device, according to the invention, consists of the fact that it can be actuated with compressed air pneumatic systems, instead of known hydraulic systems.
- The locking device thus conceived can undergo numerous modifications and variants within the scope of the invention as defined by the appended claims. In practice, the materials used, as well as the sizes, can be whatever according to the technical requirements.
Claims (9)
- Locking device (1) of tools in a machine tool, particularly of the folding press type, comprising:- a base body (3) provided with at least one insertion seat (5) for at least one tool (7);- a plurality of locking bodies (9) movable along an action direction (90) between an engagement position with said at least one tool (7), to lock said at least one tool (7) inside said seat (5), and a disengaged position with said at least one tool (7), to free said at least one tool (7) from said seat (5);- at least one mobile piston (11) able to be actuated to move said plurality of locking bodies (9) along said action direction (90) from said disengaged position to said engagement position with said at least one tool (7),characterised in that between said at least one mobile piston (11) and said plurality of locking bodies (9) at least one lamina (13) is interposed that is configured to transmit a locking thrust from said at least one mobile piston (11) to said plurality of locking bodies (9) and to move said plurality of locking bodies (9) along said action direction (90) from said disengaged position to said engagement position with said at least one tool (7).
- Locking device (1), according to claim 1, characterised in that it comprises, between said base body (3) and said lamina (13), elastic abutment means (15), said elastic abutment means (15) being configured to thrust said lamina (13) along said action direction (90), said lamina (13) being configured to transmit an unlocking thrust to said plurality of locking bodies (9) and to move said plurality of locking bodies (9) along said action direction (90) from said engagement position to said disengaged position with said at least one tool (7).
- Locking device (1), according to claim 2, characterised in that said lamina (13) engages with a first portion (17) of each of said locking bodies (9) to transmit said locking thrust and with a second portion (19) of each of said locking bodies (9), distinct from said first portion (17), to transmit said unlocking thrust.
- Locking device (1), according to claim 3, characterised in that said first portion (17) of said locking body (9) is defined by a cylindrical or spherical surface.
- Locking device (1), according to claim 3 or 4, characterised in that said second portion (19) of said locking body (9) is defined by a recess (21) formed in said locking body (9), said recess (21) having a portion (23) of said lamina (13) inserted in it.
- Locking device (1), according to one or more of the previous claims, characterised in that said locking bodies (9) are distributed along a work direction (25) substantially perpendicular to said action direction (90), said lamina (13) having an elongated shape in said work direction (25) so as to engage with said locking bodies (9), said mobile piston (11) also having an elongated shape in said work direction (25) and resting on said lamina (13).
- Locking device (1), according to one or more of the previous claims, characterised in that said mobile piston (11) is actuated pneumatically.
- Locking device (1), according to one or more of the previous claims, characterised in that it is configured to lock a plurality of variously fractioned tools (7), said lamina (13) being made of a material of the steel type capable of flexing elastically to exert a substantially homogeneous locking thrust on said variously fractioned tools (7).
- Folding press comprising a locking device (1) according to one or more of the previous claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102016000106997A IT201600106997A1 (en) | 2016-10-24 | 2016-10-24 | TOOL LOCKING DEVICE IN A TOOL MACHINE, PARTICULARLY OF THE TYPE OF A FOLDING PRESS. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3311931A1 EP3311931A1 (en) | 2018-04-25 |
EP3311931B1 true EP3311931B1 (en) | 2019-05-15 |
Family
ID=58054429
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP17197771.3A Active EP3311931B1 (en) | 2016-10-24 | 2017-10-23 | Tool locking device for a machine tool, particularly for a folding press |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3311931B1 (en) |
ES (1) | ES2741641T3 (en) |
IT (1) | IT201600106997A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11033944B2 (en) * | 2018-09-30 | 2021-06-15 | Wilson Tool International Inc. | Tool holders usable with tooling having different tang styles, and seating/securing components of such holders |
NL2026128B1 (en) * | 2020-07-24 | 2022-03-28 | Wila Bv | Clamping system for a press brake having a first biasing means acting on an actuating member and press brake comprising such a clamping system |
CN113751593A (en) * | 2021-09-24 | 2021-12-07 | 安徽东海机床制造有限公司 | Upper and lower combined die that bender non-parallel was bent |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06182448A (en) * | 1992-12-17 | 1994-07-05 | Amada Metrecs Co Ltd | Upper die holder for press brake |
JP3228902B2 (en) * | 1998-03-04 | 2001-11-12 | 株式会社アマダ | Upper die holder device |
AT414327B (en) * | 2003-05-14 | 2007-09-15 | Trumpf Maschinen Austria Gmbh | TOOL CRADLE |
-
2016
- 2016-10-24 IT IT102016000106997A patent/IT201600106997A1/en unknown
-
2017
- 2017-10-23 ES ES17197771T patent/ES2741641T3/en active Active
- 2017-10-23 EP EP17197771.3A patent/EP3311931B1/en active Active
Non-Patent Citations (1)
Title |
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None * |
Also Published As
Publication number | Publication date |
---|---|
ES2741641T3 (en) | 2020-02-11 |
IT201600106997A1 (en) | 2018-04-24 |
EP3311931A1 (en) | 2018-04-25 |
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