Mandrel assembly system

Abstract

The invention relates to a mandrel assembly system (100), for a machine rotating about an axis (A), such as a lathe, comprising a substantially cylindrical spindle plate (110) of axis (A), and a substantially cylindrical mandrel plate (120) of axis (A), the spindle plate (110) being able to be assembled, by its rear end (111), with a spindle of the rotary machine and comprising at its front end (112), of revolution about the axis (A), a first interface (113), the mandrel plate (120) comprising, at its rear end (121), a second interface (123), and its front end (122) being able to accommodate a mandrel (11), the first interface (113) complementing the second interface (123).

Description

[0001] Description

[0002] Title of the invention: Mandrel assembly system

[0003] Technical field

[0004] A chuck assembly system for a rotating machine, such as a machining lathe, provides rapid, accurate, and repeatable chuck changes.

[0005] Prior art

[0006] A lathe is a machining machine which, as is known, has a rotating spindle. This rotating spindle rotates a chuck. A chuck is a device, substantially of revolution around the axis of rotation, capable of gripping a workpiece to be machined. For this purpose, a chuck comprises at least three concentric jaws, centripetal so as to grip the workpiece by an outside diameter, or centrifugal so as to hold the workpiece by an inside diameter. The workpiece thus held is then rotated by rotation of the machine spindle and at least one tool is presented in contact with the workpiece at the location where it is to be machined.

[0007] A mandrel is secured to the spindle of the rotating machine by means of a plate which ensures, at one of its ends, an assembly with the spindle of the machine so as to be driven in rotation and at its other end an assembly with the mandrel.

[0008] When changing the chuck, the old chuck must be removed from the plate and a new chuck must be fitted to the plate. However, the existing interfaces between the plate and the chuck are generally difficult to assemble and require a long adjustment process requiring a certain amount of technical know-how in order to achieve proper concentricity.

[0009] Also, another system is sought that allows to carry out a repeatable assembly in a quick and simple way, in order to allow a quick, simple and precise change of mandrel.

[0010] "Substantially" means herein a certain tolerance in shape, dimension or number, generally 5% or 5°. - "Substantially parallel" means that the two parallel segments can form an angle of 0 to 5° between them.

[0011] - “Substantially perpendicular” means that the two segments can make an angle of 90° ± 5° between them.

[0012] - “Substantially cylindrical” means that between the base and the axis there is an angle of 0 to 5° or a circularity defect of 5%.

[0013] - "Sensibly revolutionary" means revolutionary with a minority of non-revolutionary elements.

[0014] - “Substantially equal or substantially identical” means, for a dimension, that it is equal or identical to within ± 5%.

[0015] - “Substantially equal or substantially identical, for an angle, means equal or identical to within ±5°.

[0016] - "Substantially linear" generally means linearity errors in places of ±5%

[0017] Summary of the invention

[0018] For this, the invention relates to a mandrel assembly system, for a machine rotating around an axis A, such as a machining lathe, comprising a substantially cylindrical spindle plate of axis A, and a substantially cylindrical mandrel plate of axis A, the spindle plate being able to be assembled by its rear end, with a spindle of the rotating machine and comprising at its front end, a first interface, the mandrel plate comprising, at its rear end, a second interface, and its front end, of revolution around the axis, being able to accommodate a mandrel, the first interface being complementary to the second interface.

[0019] Particular features or embodiments, usable alone or in combination, are:

[0020] - the first interface comprises a first cone of axis A and the second interface comprises a second cone of axis A, complementary to the first cone, in order to allow precise and repeatable centering between the two interfaces,

[0021] - the first interface also comprises a first rotational indexing means, such as a finger, and the second interface also comprises a second indexing means complementary to the first indexing means, such as a point or radial cavity, of the same diameter / width,

[0022] - the first interface further comprises a first central sleeve, of revolution around the axis A, secured to a jack of the rotating machine, movable in translation along the axis A relative to a bore of axis A hollowed out in a body of the spindle plate, comprising a first attachment means, the second interface further comprises a second central sleeve, of revolution around the axis A, movable in translation along the axis A relative to the chuck plate, secured to a hub of the chuck, comprising a second attachment means, capable of selectively attaching to or detaching from the first attachment means, in order to be able to transmit a translational movement along the axis A, from the jack to the hub of the chuck,

[0023] - the first socket and the second socket are hollow,

[0024] - the second attachment means comprises an outer profile of the second sleeve comprising, from the rear to the front, a first inclined segment, substantially at 45°, centrifugal, forming an entry chamfer, followed by a second segment substantially perpendicular to the axis A, centripetal, forming a stop, a third segment substantially parallel to the axis A and a fourth segment, inclined, substantially at 45°, centrifugal, together forming a cavity, followed by a fifth segment substantially parallel to the axis and located at a diameter D substantially equal to the diameter at the end of the first segment, the first attachment means comprises an inner profile of the first sleeve, complementary to the outer profile of the second sleeve, comprising, from the front to the rear, a first inclined segment, substantially at 45°, centripetal, forming an entry chamfer, followed by a second segment substantially parallel to the axis, located at a diameter substantially identical,by a value greater than the diameter D, and the first attachment means further comprises at least two, preferably at least six, slides, arranged in the first central sleeve, capable of being moved radially between a retracted position where they release the diameter D and an attachment position where they return to the diameter D so as to engage the cavity of the second sleeve, when the second sleeve is inserted into the first sleeve, - a slide has an internal profile, comprising, from front to rear, a first inclined segment, substantially at 45°, centripetal, capable of cooperating with the fourth segment of the second sleeve, followed by a second segment substantially parallel to the axis and followed by a third segment substantially perpendicular to the axis, centrifugal, capable of axially opposing the second segment of the second sleeve so as to axially attach the second sleeve relative to the first sleeve,

[0025] - the bore has an internal profile, comprising from front to rear, a first inclined segment, substantially at 45°, centrifugal, followed by a second segment substantially parallel to the axis A and followed by a third inclined segment, substantially at 45°, centripetal, and a slide has an external profile, comprising, from front to rear, a first inclined segment, substantially at 45°, centrifugal, followed by a second segment substantially parallel to the axis A and followed by a third inclined segment, substantially at 45°, centripetal, the first segment being able to cooperate with the first segment of the bore, so as to retract the slide when the first sleeve is moved, relative to the body, towards the front, and the third segment being able to cooperate with the third segment of the bore, so as to engage the slide in the cavity when the first sleeve is moved, relative to the body, towards the rear,

[0026] - the chuck plate also comprises at least two second securing means, preferably at least three, such as quarter-turn screws, and the spindle plate comprises at least as many first complementary securing means, such as housings,

[0027] - the rear end of a spindle plate is adapted to a rotating machine spindle format,

[0028] - the front end of a chuck plate is adapted to a chuck format.

[0029] According to a second aspect of the invention, a method for changing a chuck by means of such a system, comprising the following steps: - placing the spindle plate in the docking configuration by moving, by means of a cylinder of the rotating machine, the first sleeve forward, so as to retract the slides, - docking the chuck plate, preferably pre-equipped with a chuck, against the spindle plate, the second sleeve engaging the first sleeve, so as to place the cavities axially opposite the slides, - placing the spindle plate in the hooking configuration by moving, by means of the cylinder of the rotating machine, the first sleeve backward, so as to engage the slides in the cavities, - securing the chuck plate to the spindle plate by locking the first and second securing means.

[0030] Brief description of the drawings

[0031] The invention will be better understood by reading the following description, given solely by way of example, and with reference to the appended figures in which:

[0032] [Fig. 1] shows, in cut profile view, a spindle plate and a chuck plate before docking,

[0033] [Fig. 2] shows, in a cutaway profile view, the spindle plate and the chuck plate of figure 1 docked,

[0034] [Fig. 3] shows, in cutaway profile view, the spindle plate and chuck plate of Figure 1 assembled,

[0035] [Fig. 4] shows, in axial view, the spindle plate,

[0036] [Fig. 5] shows, in schematic view, the external profile of the second socket,

[0037] [Fig. 6] shows, in schematic view, the internal profile of the first sleeve and the internal profile of a slide,

[0038] [Fig. 7] shows, in schematic view, the external profile of a slide in relation to the internal profile of the bore.

[0039] Description of the embodiments

[0040] With reference to figures 1, 2 or 3, the invention relates to a mandrel assembly system 100, for a machine rotating around an axis A, such as a machining lathe.

[0041] The machine is arranged to the left of the figures and is not shown. It comprises at least one rotating spindle with axis A. To hold a part during machining, the machine uses a chuck 11 arranged to the right of the figures, shown in a double-dot axis line. Between the spindle of the rotating machine and the chuck 11 is arranged a chuck fixing system, allowing a change of chuck 11. This system must ensure a double coupling between the spindle and the chuck 11. On the one hand a rotational coupling: the rotation of the spindle, around the axis A, must be transmitted to the chuck 11. On the other hand, a translational coupling: the control of the chuck 11 for its clamping / unclamping is carried out by a central hub mobilized in translation along the axis A. A jack, present on the rotating machine, is capable of mobilizing this translation, provided that it is coupled with the central hub of the chuck 11.

[0042] According to the prior art, the assembly of a mandrel on a rotary machine spindle is carried out by means of a plate. This plate is substantially cylindrical with axis A.

[0043] It is suitable for being assembled, by its rear end, with a spindle of the rotary machine and by its front end, to a mandrel.

[0044] The difficulty is that the assembly of the mandrel on the plate is carried out by means of a complex interface to implement. The assembly of a new mandrel on the plate requires a long process requiring certain technical know-how, in order to correctly achieve concentricity.

[0045] In order to solve this problem, the invention proposes to provide a two-part plate, a spindle plate 110 and a chuck plate 120. The spindle plate 110 is adapted for fixing and coupling with the spindle, while the chuck plate 120 is adapted for fixing and coupling with the chuck 11.

[0046] By convention, in this document, the rear designates relatively a part closer to the spindle, i.e. more to the left of figures 1-3 and the front designates a part further from the spindle, i.e. more to the right of figures 1-3. Similarly, it is agreed to designate by first an element relating to the spindle plate and by second an element relating to the chuck plate.

[0047] The system 100 according to the invention comprises a spindle plate 110 and a chuck plate 120 capable of being assembled together, in a simple, precise and repeatable manner, in order to allow a chuck change not requiring the technicality or duration of a chuck change according to the prior art.

[0048] As illustrated in Figure 1, on the left side, a spindle plate 110 is substantially cylindrical with axis A. Its rear end 111, substantially of revolution around axis A, is shaped to allow the assembly of the spindle plate 110 with a spindle of the rotary machine, so as to take up the rotary movement of the spindle and the translational movement of the jack. This is similar to the rear end of a plate of the prior art.

[0049] In addition, at its front end 112, substantially of revolution around the axis A, the spindle plate 110 has a first interface 113.

[0050] As illustrated in Figure 1, on the right-hand side, a mandrel plate 120 is substantially cylindrical with axis A. Its front end 122, substantially of revolution around axis A, is shaped to allow the assembly of the mandrel plate 120 with a mandrel 11.

[0051] In addition, at its rear end 121, substantially of revolution around the axis A, the mandrel plate 120 has a second interface 123.

[0052] According to an important characteristic, the first interface 113 is complementary to the second interface 123.

[0053] The assembly / disassembly of the first interface 113 with the second interface 123 makes it possible to mount / disassemble a mandrel 11 from a rotary machine. The fact that the first interface 113 and the second interface 123 are easy to assemble, quickly, accurately and repeatably, makes it possible to carry out a rapid change of mandrel 11.

[0054] The spindle plate 110 provides the interface with the spindle of the rotating machine. Thus, a modification of the rear end 111 of a spindle plate makes it possible to adapt the invention to a type of rotating machine.

[0055] The mandrel plate 120 provides the interface with the mandrel 11. Thus, a modification of the front end 122 of a mandrel plate makes it possible to adapt the invention to a type of mandrel. In addition, if the assembly between the mandrel plate 20 and a mandrel 11 is complex and requires significant technical expertise, this drawback is minimized in that this assembly can only be carried out once: a mandrel plate 120 is dedicated to a mandrel 11, with which it remains integral.

[0056] In order to describe the assembly and disassembly, Figure 1 illustrates the spindle plate 110 separated from the chuck plate 120, Figure 2 illustrates the two plates 110, 120 docked and Figure 3 illustrates them assembled. A disassembly repeats the assembly steps in reverse order. According to another characteristic, the first interface 113 comprises a first cone 18 of axis A and the second interface 123 comprises a second cone 19 of axis A, complementary to the first cone 18. This characteristic makes it possible to achieve precise and repeatable centering between the two interfaces 113, 123. The first cone 18 may be an outer cone as illustrated. In this case the second cone 19 is an inner cone. Alternatively, the first cone 18 may be an inner cone. In this case the second cone 19 is an outer cone. The half-angle at the apex of this cone may be any. Preferably, it is between 2 and 12°.Even more preferably, it is approximately equal to 7°.

[0057] The preceding double cone 18, 19 ensures centering. According to another characteristic, the first interface 113 further comprises a first rotational indexing means 20, and the second interface 123 further comprises a second indexing means 21 complementary to the first indexing means 20. The first indexing means 20 or the second indexing means 21 may be a finger, such as the finger 20 illustrated, substantially cylindrical. The second indexing means 21 or the first indexing means 20 is complementary. It may be a point cavity. In this case, the point cavity has a bore diameter substantially identical to the diameter of the finger. It may also be a substantially linear groove, preferably radial. In this case, the width of the groove has a width substantially identical to the diameter of the finger.

[0058] The double cone 18, 19 and the rotational indexing means contribute to simple, precise and repeatable repositioning. A repeatability of the order of 6p is thus obtained thanks to the 100 system.

[0059] The double cone 18, 19 and the rotational indexing means contribute, with other fixing systems, to securing the spindle plate 110 with the rotating chuck plate 120. Also, the rotational movement of the spindle is transmitted to the spindle plate 110 which transmits it to the chuck plate 120, which itself drives the chuck 11.

[0060] The system 100 must also transmit a translational movement, originating from a cylinder of the rotating machine, to a hub of the chuck 11, so that the rotating machine can control the tightening or loosening of the chuck 11. For this, the first interface 113 also comprises a first central sleeve 2. This first central sleeve 2 is of revolution around the axis A. It can slide, axially, in a bore 22 of axis A made in the body 1 of the spindle plate 110.

[0061] The first sleeve 2 is capable, from the rear, of interfacing with the cylinder of the rotating machine which can thus move it in translation along the axis A.

[0062] Similarly, the second interface 123 also comprises a second central sleeve 10. This second central sleeve 10 is of revolution around the axis A. It can slide, axially, in a bore of axis A made in the body 5 of the chuck plate 120.

[0063] The second sleeve 10 is capable, from the front, of interfacing with a central means of the chuck 11, making it possible to control the tightening / loosening as it is moved in translation along the axis A.

[0064] In order to transmit the translational movement along the axis A of the jack to the mandrel 11, it is appropriate to couple the first sleeve 2 with the second sleeve 10, in translation.

[0065] For this, according to another characteristic, the first sleeve 2 comprises a first attachment means, the second sleeve 10 comprises a second complementary attachment means, capable of selectively attaching to or detaching from the first attachment means, in order to be able to transmit a translational movement along the axis A of the jack to the hub of the mandrel 11.

[0066] According to another characteristic, the first sleeve 2 and the second sleeve 10 are hollow. This very advantageous characteristic allows the installation of a bar feeder, capable of feeding the mandrel 11 with parts, from the machine, from inside the sleeves.

[0067] According to another characteristic, the first attachment means is produced by a particular internal profile of the first socket 2 and the second attachment means is produced by a corresponding particular external profile of the second socket 10.

[0068] The details of the profiles and their interactions are detailed in the block diagrams of Figures 5 to 7. The external profile of the second sleeve 10, as illustrated in Figure 5, comprises, from the rear, on the left of the figure, towards the front, on the right of the figure, a first segment 124 inclined, substantially at 45°, centrifugal, in that it moves away from the axis A as one moves forward. This first segment 124 forms an entry chamfer. This first segment 124 is followed by a second segment 125 substantially perpendicular to the axis A, centripetal. This second segment 125 forms a stop. A third segment 126 follows, substantially parallel to the axis A. A fourth segment 127 follows, inclined, substantially at 45°, centrifugal. These three segments 125-127 together form a cavity 128. There follows a fifth segment 129 substantially parallel to the axis A. This fifth segment 129 is located at a diameter D substantially equal to the diameter reached at the end of the first segment 124.

[0069] The inner profile of the first sleeve 2, as illustrated in Figure 6, is complementary to the outer profile of the second sleeve 10. The rear end of the second sleeve 10 is capable of being introduced into the front end of the first sleeve 2. The inner profile of the first sleeve 2 comprises, from front to rear, a first segment 114 inclined, substantially at 45°, centripetal. This first segment 114 forms an entry chamfer. This first segment 114 is followed by a second segment 115 substantially parallel to the axis A. This second segment 115 is located at a diameter substantially identical, by greater value, to the diameter D.

[0070] The first attachment means also comprises at least two, preferably at least six, sliders 3. These sliders 3 are arranged in the first central sleeve 2. They are capable of being moved radially between a retracted position where they release the diameter D and an attachment position where they return to the diameter D so as to engage the cavity 128 of the second sleeve 10, when the latter, the second sleeve 10, is inserted into the first sleeve 2.

[0071] In order to ensure its hooking function, a slider 3, according to another characteristic, has an internal profile, as illustrated in Figure 6, comprising, from front to rear, a first segment 131 inclined, substantially at 45°, centripetal, followed by a second segment 132 substantially parallel to the axis A and followed by a third segment 133 substantially perpendicular to the axis A, centrifugal. The first segment 131 is able to cooperate with the fourth segment 127 of the second sleeve 10. The third segment 133 is able to axially oppose the second segment 125 of the second sleeve 10 so as to form an axial stop and to hook the second sleeve 10 and the second interface 123 relative to the first sleeve 2 and to the first interface 113, in translation along the axis A.

[0072] The axial length I of a slide 3 is slightly less than the corresponding length L of a cavity 128.

[0073] It has been seen that the slides 3 can move radially between a docking position where they are retracted and release the diameter D and a hooking position where they penetrate into the diameter D and into the cavity 128.

[0074] For this, according to another characteristic, more particularly illustrated in figure 7, the bore 22 has an adapted internal profile, complementary to the external profile of a slide 3.

[0075] According to another characteristic, the internal profile of the bore 22 comprises, from front to rear, a first segment 141 inclined, substantially at 45°, centrifugal, followed by a second segment 142 substantially parallel to the axis A and followed by a third segment 143 inclined, substantially at 45°, centripetal, and where a slide 3 has an external profile, comprising from front to rear a first segment 151 inclined, substantially at 45°, centrifugal, followed by a second segment 152 substantially parallel to the axis A and followed by a third segment 153 inclined, substantially at 45°, centripetal, the first segment 151 being able to cooperate with the first segment 141 of the bore 22, so as to retract the slide 3 when the first sleeve 2 is moved, relative to the body 1, towards the front, and the third segment 153 being able to cooperate with the third segment 143 of the bore 22,so as to engage the slide 3 in the cavity 128 when the first sleeve 2 is moved, relative to the body 1, towards the rear.,

[0076] The distance between the 1 er segment 141 and 3 e segment 143 of the profile of the bore 22 is greater than the distance between the 1 er segment 151 and 3 esegment 153 of the profile of the slide 3 of a game. This game can be of the order of 5 mm. Once the first sleeve 2 has been hooked with the second sleeve 10, it is appropriate to assemble the spindle plate 110 with the chuck plate 120. For this, according to another characteristic, the chuck plate 120 further comprises at least two second securing means, preferably at least three, such as quarter-turn screws 8, and the spindle plate 110 comprises at least as many first complementary securing means, such as housings 16. The screws 8 have a fin-shaped body 6. The housing 16 has a fin shape allowing the screw 8 to be inserted when it is aligned. After a quarter-turn rotation, the fin 6 is trapped in the housing 16. Springs 7 make it possible to give a certain compliance to the assembly.

[0077] One of the advantages of the invention, by separating the plate into a spindle plate 110 on the one hand and a chuck plate 120 on the other hand, is to separate the interface adaptation on the spindle side on the one hand and on the chuck side on the other hand.

[0078] It is thus possible, according to another characteristic, to conform the rear end

[0079] III of a 110 spindle plate to adapt it to a rotating machine spindle format.

[0080] It is also possible, according to another characteristic, to conform the front end 122 of a mandrel plate 120 to adapt it to a mandrel format 11. Each of the two adaptations is done independently of one another.

[0081] Advantageously, a mandrel 11 is pre-assembled with a dedicated mandrel plate 120, in order to simplify a change of mandrel 11 by limiting / reducing it to a change of mandrel plate 120. The technicality of the mandrel / mandrel plate assembly is then only supported once.

[0082] The invention also relates to a method for changing a mandrel 11 by means of such a system. The spindle plate 110 is assumed to be mounted on the spindle of the rotating machine, with the first sleeve 2 attached to the jack. Otherwise, it should be mounted beforehand. Similarly, the mandrel plate 120 is assumed to be assembled with a mandrel 11. Otherwise, it should be assembled beforehand.

[0083] The method comprises the following steps. During a first step, the spindle plate 110 is placed in the docking configuration. For this, the first sleeve 2 is moved forward, preferably by means of the cylinder of the rotating machine. This movement of the first sleeve 2 forward, as detailed previously, causes the slides 3 to retract. This retraction releases the diameter D, allowing the nose of the second sleeve 10 to be inserted into the opening of the first sleeve 2.

[0084] During a second step, the chuck plate 120 is docked. For this purpose, the chuck plate 120 is placed opposite the spindle plate 110, their axis A merged, the first interface 113 facing the second interface 123, as illustrated in FIG. 1. Then at least one of the plates 110, 120 is brought closer to the other, by a translation of axis A, so that the second sleeve 10 engages the first sleeve 2, in depth, until the cavity 128 is placed axially opposite the slides 3. During docking, the securing means are engaged one in the other. Thus, the screws 6 are engaged in the housings 16, in open orientation.

[0085] During a third step, the spindle plate 110 is placed in the hooking configuration. For this, the first sleeve 2 is moved backward, preferably by means of the cylinder of the rotating machine. This movement of the first sleeve 2 backward, as detailed previously, causes the slides 3 to engage in the cavities 128.

[0086] The chuck plate 120 being pressed against the spindle plate 110 and the bushings 2, 10 being hooked, it is possible, during a fourth step, to secure the chuck plate 120 to the spindle plate 110 by locking the first and second securing means. This is done by turning the screws 6 a quarter turn so as to place them in the closed orientation.

[0087] The invention has been illustrated and described in detail in the drawings and the preceding description. The foregoing description should be considered illustrative and given by way of example and not as limiting the invention to this description alone. Numerous alternative embodiments are possible.

[0088] List of reference signs

[0089] 1: first body,

[0090] 2: first socket,

[0091] 3: slide, 4: flange,

[0092] 5: second body,

[0093] 6: fin,

[0094] 7: compliance element,

[0095] 8: screw,

[0096] 9: counterbore,

[0097] 10: second socket,

[0098] 11: chuck,

[0099] 12: stop surface of the slide (segment 133),

[0100] 13: 45° slope (segment 143)

[0101] 14: abutment surface of cavity 128 (segment 125)

[0102] 15: 45° slope (segment 141)

[0103] 16: screw housing,

[0104] 17: slide housing,

[0105] 18: first cone,

[0106] 19: second cone,

[0107] 20: first means of indexing,

[0108] 21: second means of indexing,

[0109] 22: bore,

[0110] 100: assembly system,

[0111] 110: spindle tray,

[0112] 111: rear end of the spindle tray,

[0113] 112: front end of the spindle tray,

[0114] 113: first interface,

[0115] 114:1 er segment of the inner profile of the first socket,

[0116] 115:2 e segment of the inner profile of the first socket,

[0117] 120: chuck plate,

[0118] 121: rear end of the chuck plate,

[0119] 122: front end of the chuck plate,

[0120] 123: second interface,

[0121] 124:1 er segment of the outer profile of the second socket,

[0122] 125:2 e segment of the outer profile of the second socket,

[0123] 126:3 e segment of the outer profile of the second socket, 127:4 e segment of the outer profile of the second socket,

[0124] 128: cavity,

[0125] 129:5 e segment of the outer profile of the second socket,

[0126] 131:1 er segment of the inner profile of the slide, 132:2 e segment of the inner profile of the slide,

[0127] 133:3 e segment of the inner profile of the slide,

[0128] 141:1 er segment of the inner profile of the bore,

[0129] 142:2 esegment of the inner profile of the bore,

[0130] 143:3 e bore inner profile segment, 151:1 er segment of the outer profile of the slide,

[0131] 152:2 e segment of the outer profile of the slide,

[0132] 153:3 e segment of the outer profile of the slide,

[0133] A: axis,

[0134] D: diameter of the rings, I: length of a slide,

[0135] L: length of a cavity. |

Claims

AMENDED CLAIMS received by the International Bureau on June 13, 2025 (13.06.2025) Claims

1. System (100) for assembling a chuck, for a machine rotating about an axis (A), such as a machining lathe, which comprises a substantially cylindrical spindle plate (110) of axis (A), and a substantially cylindrical chuck plate (120) of axis (A), the spindle plate (110) being capable of being assembled, by its rear end (111), with a spindle of the rotary machine and comprising at its front end (112), a first interface (113), the chuck plate (120) comprising, at its rear end (121), a second interface (123), and its front end (122), being capable of receiving a chuck (11), the first interface (113) being complementary to the second interface (123), in that the first interface (113) comprises a first cone (18) of axis (A) and in that the second interface (123) comprises a second cone (19) of axis (A) complementary to the first cone (18), in order to allow precise and repeatable centering between the two interfaces (113, 123),characterized in that a slide (3) has an internal profile, comprising, from front to rear, a first segment (131) inclined, substantially at 45°, centripetal, capable of cooperating with the fourth segment (127) of the second sleeve (10), followed by a second segment (132) substantially parallel to the axis (A) and followed by a third segment (133) substantially perpendicular to the axis (A), centrifugal, capable of axially opposing the second segment (125) of the second sleeve (10) so as to axially hook the second sleeve (10) relative to the first sleeve (2) and in that the half-angle at the apex of the cone is between 2 and 12°.,

2. System (100), according to the preceding claim, in which the second attachment means comprises an external profile of the second sleeve (10) comprising, from the rear to the front, a first segment (124) inclined, substantially at 45°, centrifugal, forming an entry chamfer, followed by a second segment (125) substantially perpendicular to the axis (A), centripetal, forming a stop, a third segment (126) substantially parallel to the axis (A) and a fourth segment (127), inclined, substantially at 45°, centrifugal, together forming a cavity (128), followed by a fifth segment (129) substantially parallel to the axis (A) and located at a diameter (D) substantially equal to the diameter at the end of the first segment (124), where the first attachment means comprises a profile interior of the first sleeve (2), complementary to the exterior profile of the second sleeve (10), comprising, from front to rear, a first segment (114) inclined, substantially at 45°, centripetal, forming an entry chamfer, followed by a second segment (115) substantially parallel to the axis (A), located at a diameter substantially identical, by greater value, to the diameter (D), and where the first attachment means further comprises at least two, preferably at least six, sliders (3), arranged in the first central sleeve (2), capable of being moved radially between a retracted position where they release the diameter (D) and an attachment position where they return to the diameter (D) so as to engage the cavity (128) of the second sleeve (10), when the second sleeve (10) is inserted into the first sleeve (2). [Claim s] System (100), according to the preceding claims wherein the bore (22) has an internal profile, comprising, from front to rear, a first segment (141) inclined, substantially at 45°, centrifugal, followed by a second segment (142) substantially parallel to the axis (A) and followed by a third segment (143) inclined, substantially at 45°, centripetal, and where a slide (3) has an external profile, comprising, from front to rear, a first segment (151) inclined, substantially at 45°, centrifugal, followed by a second segment (152) substantially parallel to the axis (A) and followed by a third segment (153) inclined, substantially at 45°, centripetal, the first segment (151) being able to cooperate with the first segment (141) of the bore (22), so as to retract the slide (3) when the first socket (2) is moved, relative to the body (1), forward,and the third segment (153) being able to cooperate with the third segment (143) of the bore (22), so as to engage the slide (3) in the cavity (128) when the first sleeve (2) is moved, relative to the body (1), towards the rear.,

4. System (100), according to any one of the preceding claims, in which the first interface (113) further comprises a first rotational indexing means (20), such as a finger, and where the second interface (123) further comprises a second indexing means (21) complementary to the first indexing means (20), such as a point or radial cavity, of the same diameter / width. [Claim s] System (100), according to any one of the preceding claims, wherein the first interface (113) further comprises a first central sleeve (2), of revolution around the axis (A), secured to a jack of the rotating machine, movable in translation along the axis (A) relative to a bore (22) of axis (A) hollowed out in a body (1) of the spindle plate (110), comprising a first attachment means, wherein the second interface (123) further comprises a second central sleeve (10), of revolution around the axis (A), movable in translation along the axis (A) relative to the mandrel plate (120), secured to a hub of the mandrel (11), comprising a second attachment means, capable of selectively attaching to or detaching from the first attachment means, in order to be able to transmit a translational movement along the axis (A), from the jack to the hub of the mandrel (11).

6. System (100), according to the preceding claim, wherein the first socket (2) and the second socket (10) are hollow.

7. System (100), according to any one of the preceding claims, where the chuck plate (120) further comprises at least two second securing means, preferably at least three, such as quarter-turn screws (8), and where the spindle plate (110) comprises at least as many first complementary securing means, such as housings (16). [Claim s] System (100), according to any one of the preceding claims, wherein the rear end (111) of a spindle plate (110) is adapted to a rotating machine spindle format. [Claim s] System (100), according to any one of the preceding claims, wherein the front end (122) of a mandrel plate (120) is adapted to a mandrel format (11).

10. A method of changing a mandrel (11) by means of a system according to any one of the preceding claims, comprising the following steps: - placing the spindle plate (110) in the docking configuration by moving, by means of a cylinder of the rotating machine, the first sleeve (2) forward, so as to retract the slides (3), - docking of the mandrel plate (120), preferably pre-equipped with a mandrel (11), against the spindle plate (110), the second sleeve (10) engaging the first sleeve (2), so as to place the cavities (128) axially opposite the slides (3), - placing the spindle plate (110) in the hooking configuration by moving, by means of the cylinder of the rotating machine, the first sleeve (2) towards the rear, so as to engage the slides (3) in the cavities (128), - securing the chuck plate (120) to the spindle plate (110) by locking the first and second securing means.