JP3769440B2 - Attachment indexing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an attachment indexing device used for indexing an attachment attached to a tip of a ram of a machine tool.
[0002]
[Prior art]
FIG. 8 is a configuration diagram illustrating an example of a portal machining center.
The machining center shown in FIG. 8 is a so-called portal-type machining center, and includes a cross rail 37 movably supported at both ends by the shafts of the portal column 38, and is movably supported on the cross rail 37. A ram 45 is provided so as to be movable in the vertical direction (Z-axis direction) via the saddle 44 formed.
[0003]
The saddle 44 is provided with a nut portion (not shown) through the inside of the cross rail 37 in the horizontal direction, and a ball screw 41 is screwed to the nut portion. A Y-axis servomotor 18 is provided at the end of the ball screw 41, and the ball screw 41 is rotationally driven by the Y-axis servomotor 18.
The saddle 44 can be moved in the Y-axis direction by the rotational drive of the ball screw 41.
[0004]
Further, the saddle 44 includes a nut portion (not shown) in the vertical direction, and a ball screw 42 is screwed to the nut portion. A Z-axis servo motor 20 is provided at the end of the ball screw 42. The ball screw 42 is rotationally driven by the Z-axis servomotor 20, whereby the ram 45 movably provided on the saddle 44 is moved in the Z-axis direction.
[0005]
A spindle motor 31 is built in the ram 45, and the spindle motor 31 rotationally drives a cutting tool T such as an end mill provided at the tip of the ram 45.
An X-axis table 35 is provided below the ram 45 so as to be movable in the X-axis direction. The X-axis table 35 includes a nut portion (not shown), and a ball screw (not shown) provided along the X-axis direction is screwed to the nut portion, and the X-axis servo motor 19 is connected to the ball screw. Has been.
The X-axis table 35 is moved in the X-axis direction by the rotational drive of the X-axis servomotor 19.
The drive control of the Y-axis servomotor 18, the X-axis servomotor 19 and the Z-axis servomotor 20 is performed by the NC device 1.
[0006]
The gate-shaped column 38 is formed with a female screw portion (not shown), and the cross rail 37 is moved up and down by rotationally driving a ball screw 32 a screwed to the column column 38 by the cross rail lifting motor 32.
The cutting tool T can be changed to various types by an automatic tool changer (ATC) 39.
[0007]
An attachment 50 is attached to the tip of the ram 45, and this attachment 50 can be replaced with various attachments. Attachment replacement is performed by an automatic changer (AAC) 40.
The attachment 50 may be, for example, a standard snout type, a feature snout type, a 30 ° head type, an angle head type, a five-side machining head type, depending on the shape of the workpiece, the orientation of the machining surface, the diameter limit of the tool used, etc. Various attachments such as an index head type are used.
[0008]
[Problems to be solved by the invention]
By the way, in the attachment 50 such as the 30 ° head type, the angle head type, the five-face machining head type, and the index head type, the attachment 50 is attached to the axis of the ram 45 (C-axis) according to the shape of the workpiece and the orientation of the machining surface. ) One having an indexing function for determining a rotational position around is known.
The rotational position of the attachment 50 with respect to the ram 45 is determined by, for example, moving the attachment 50 provided rotatably with respect to the ram 45 via the coupling in the C-axis direction with respect to the ram 45. The coupling is released, and instead, the attachment 50 is coupled to a main shaft for rotating a tool as a drive shaft, rotated to a desired rotational position by the rotation of the main shaft, and coupled again to the coupling.
[0009]
Further, it is necessary to supply lubricating oil, coolant, air, and the like to the attachment 50 side through the ram 45, and a flow path for supplying these fluids is formed between the ram 45 and the attachment 50. A plurality of sealing members such as an O-ring for sealing the flow path are used for these flow paths. When the attachment 50 is rotated with respect to the ram 45, these attachments 50 and the ram 45 have a gap between them. A sliding resistance of the seal member is generated.
By the way, in the above-described indexing of the attachment 50, when the coupling between the attachment 50 and the main shaft is released when the coupling is coupled again from the state where the coupling is released, the attachment 50 can freely rotate with respect to the ram 45. It becomes a state.
In this state, if the sliding resistance of the sealing member is generated, the attachment 50 may rotate by a small angle due to the sliding resistance of the sealing member.
If the minimum indexing angle of the attachment 50 is large, for example, 90 degrees, the number of teeth of the coupling is small accordingly, so that the coupling is coupled at a desired rotational position. On the other hand, for example, if the minimum indexing angle is reduced to 5 degrees or 1 degree, the number of teeth of the coupling is large. Therefore, if a minute rotation occurs due to the sliding resistance of the seal member of the attachment 50, the coupling rotates accurately. There is a case where the rotational position of the attachment 50 cannot be accurately determined without coupling at the position.
[0010]
The present invention has been made in view of the above-described problems, and an object thereof is to provide an attachment indexing device that can prevent the occurrence of indexing failure during indexing operation.
[0011]
[Means for Solving the Problems]
An attachment indexing device according to a first aspect of the present invention is an attachment indexing device for determining the rotational position of an attachment that is rotatably mounted around the axis of the ram at the tip of a ram of a machine tool. The coupling having the number of meshing teeth according to the minimum index angle of the attachment for coupling and releasing the attachment and the ram by the movement of the axial direction, and coupling with the attachment according to the release of the coupling The attachment to the axis Around When the coupling shifts from the released state to the coupled state, the rotation of the attachment around the axis is restricted before the coupling between the attachment and the drive shaft is released. And attachment rotation restricting means for guiding in the axial direction.
[0012]
The attachment rotation restricting means is provided on one of the attachment or the ram, and has the same number of meshing teeth as the meshing teeth of the coupling arranged in correspondence with the meshing teeth of the coupling along the circumference. A first meshing tooth member that is provided on the other of the attachment or the ram, and is attached to at least a part of the first meshing tooth member as the attachment and the ram are shifted from a released state to a coupled state. And a second meshing tooth member having meshing teeth for meshing.
[0013]
The attachment is a swivel portion provided so as to be turnable about an axis of a predetermined swivel axis with respect to the attachment main body, and the attachment main body and the swivel portion are coupled by movement of the swivel portion in the swivel axis direction. A second coupling having a number of meshing teeth according to the minimum index angle of the revolving part to be released, and a clamping means for restraining the revolving position of the revolving part which is indexed in the released state. And when the second coupling shifts from the released state to the coupled state, the turning direction of the swivel shaft is controlled before the swivel unit is restrained from turning before the clamping means is released. And turn regulation guide means for guiding the vehicle.
[0014]
The turning restriction guide means is provided on one of the turning shaft and the attachment main body, and has the same number of meshing teeth as the meshing teeth of the coupling arranged in correspondence with the meshing teeth of the second coupling. A first meshing tooth member provided along a circumference, provided on the other of the pivot shaft and the attachment main body, and the first meshing with a transition from a released state to a coupled state of the attachment and the ram. And a second meshing tooth member having meshing teeth meshing with at least a part of the tooth member.
[0015]
An attachment indexing device according to a second aspect of the present invention is an indexing device for indexing a turning position of a turning portion provided so as to be turnable around a predetermined turning axis of an attachment attached to a tip of a ram of a machine tool. A drive shaft which is built in the ram and can be coupled to and released from the swivel shaft, and rotates the swivel shaft, and the attachment main body and the swivel portion are moved by moving the swivel portion in the swivel axis direction. A coupling having a number of meshing teeth according to the minimum indexing angle of the swivel unit for coupling and releasing, and coupling of the drive shaft and the swivel shaft when the coupling shifts from the released state to the coupled state And turning regulation guide means for guiding the turning part in the direction of the turning axis while restricting the turning of the turning part before being released.
[0016]
In the present invention, in order to determine the rotational position of the attachment, the attachment is moved in the axial direction of the ram to release the coupling. Thereby, a drive shaft and an attachment couple | bond.
From this state, if the drive shaft is rotated to rotate the attachment to a desired rotation position and the attachment is moved in the opposite axial direction, the attachment is attached before the coupling with the drive shaft is released. The rotation around the axis is regulated by the rotation regulating means.
Further, the attachment is guided in the axial direction by the attachment rotation restricting means, the coupling with the drive shaft is released, the coupling is coupled, and the indexing of the attachment is completed.
Thus, in the present invention, before the coupling between the attachment and the drive shaft is released, rotation around the axis is restricted by the rotation restricting means, and the rotation is restricted and guided in the axial direction. Even if the indexing minimum angle of the coupling is reduced, the indexing failure does not occur.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing an example of an attachment to which the attachment indexing device of the present invention is applied.
The attachment 71 shown in FIG. 1 is a so-called index attachment, and is attached to the tip of the ram 61.
The attachment 71 can determine the rotational position around the C axis, which is the axis of the ram 61, and the attachment 71 can be turned around the B axis perpendicular to the C axis as a turning portion of the present invention. The tool holding unit 100 is provided.
The tool holding unit 100 holds the cutting tool T, and can determine the rotational position around the B axis.
[0018]
The tool T mounted on the tool holding unit 100 is rotated by transmitting the rotational force of the main shaft as the drive shaft of the present invention driven by the main shaft motor built in the ram 61. The mechanism for transmitting the rotational force from the spindle to the tool T is a well-known technique and will not be described in detail.
[0019]
FIG. 2 is a diagram showing a first embodiment of the attachment indexing device of the present invention, and is a cross-sectional view showing the configuration of the indexing device for indexing around the C axis of the attachment 71 shown in FIG.
The indexing device 60 shown in FIG. 2 includes a main shaft 72 disposed in a cavity in the ram 61, a coupling / release member 78 inserted into the main shaft 72 and fixed to a part of the attachment 71, the attachment 71, the ram 61, and the like. , A meshing tooth member 81 provided on the outer periphery of the ram 61, and a meshing tooth member 82 provided on the outer periphery of the attachment 71.
[0020]
The ram 61 is made of, for example, a square member, and the inner peripheral surface 61a is circular. The ram 61 incorporates a spindle motor (not shown) inside.
[0021]
The main shaft 72 is disposed along the C axis, which is the central axis of the ram 61, and is rotationally driven by the main shaft motor.
An even number of tooth portions 73 are formed at equal intervals along the circumferential direction in the shaft portion of the main shaft 72, and the tooth portions 73 are parallel to each other.
The main shaft 72 is connected to the above-described tool T by a transmission mechanism (not shown) so that the main shaft 72 can be coupled and released, and the tool T is rotated by the rotation of the main shaft 72.
[0022]
The coupling / release member 78 is formed of a cylindrical member, and the main shaft 72 is inserted into the hole 78a on the upper end side, and is movable in the C-axis direction.
A plurality of groove portions 74 that mesh with the tooth portions 73 formed on the main shaft 72 are formed on the inner peripheral surface of the hole 78a.
The groove portion 74 meshes with the tooth portion 73 of the main shaft 72 by the movement in the direction of the arrow D2 along the C axis of the coupling / release member 78, and the meshing is released by the movement in the direction of the arrow D1. The groove part 74 of 78 and the tooth | gear part 73 of the main axis | shaft 72 comprise the spline.
[0023]
The flange portion 78b at the lower end of the coupling / release member 78 is connected to the attachment 71 by fastening means such as a bolt. Accordingly, the attachment 71 also moves in accordance with the movement of the coupling / release member 78 in the directions of the arrows D1 and D2.
[0024]
A plurality of seal members, for example, O-rings 75, are interposed between the outer peripheral surface 78c of the coupling / release member 78 and the inner peripheral surface 61a of the ram 61. The outer peripheral surface 78c of the coupling / release member 78 is O It can slide with respect to the ring 75.
[0025]
The O-ring 75 is for sealing a flow path for supplying fluid such as lubricating oil, coolant, air, or the like from the ram 61 side to the attachment 71 side.
[0026]
The Kirbic coupling 62 includes two ring-shaped members 62a and 62b. One ring-shaped member 62a is fixed to the attachment 71, and the other ring-shaped member 62b is fixed to the ram 61 side.
Convex teeth (convex teeth) that are the number of meshing teeth corresponding to the minimum indexing angle around the C axis of the attachment 71 are formed on one of the opposing surfaces of these two ring-shaped members 62a and 62b. Convex teeth (concave teeth) meshing with the convex teeth are formed.
For example, when the minimum indexing angle around the C-axis of the attachment 71 is 5 degrees, 72 concave teeth and convex teeth are formed, respectively. When the minimum indexing angle is 1 degree, 360 concave teeth and Each convex tooth is formed.
Such concave teeth and convex teeth contact all the tooth surfaces, so that high rigidity and automatic alignment can be obtained.
[0027]
Here, FIG. 3 is a view showing the positional relationship between the meshing tooth member 81 and the meshing tooth member 82, and is a view seen from the ram 61 side.
As shown in FIG. 3, the meshing tooth member 82 is a ring-shaped member, and is fitted and fixed to the outer periphery of the attachment 71.
The meshing tooth member 82 has the same number of meshing teeth 82 a as the meshing teeth formed on the above-described Kirbic coupling 62 on the outer periphery at positions corresponding to the meshing teeth of the Kirbic coupling 62.
Further, the meshing teeth 82a of the meshing tooth member 82 extend linearly along the C axis.
[0028]
The meshing tooth member 81 is fixed to the outer periphery of the ram 61 by a fixing member 80 and is disposed at a symmetrical position with respect to the C axis.
The meshing tooth member 81 includes a plurality of, for example, three meshing teeth 81 a that can mesh with a part of the meshing teeth 82 a of the meshing tooth member 82.
[0029]
Next, an example of an indexing operation of the attachment 71 by the attachment indexing device 60 having the above configuration will be described.
The attachment indexing device 60 in FIG. 2 is in a state in which the meshing teeth of the ring-shaped members 62a and 62b of the Kirvic coupling 62 are engaged, and the attachment 71 and the ram 61 are coupled.
Further, the meshing tooth 82a of the meshing tooth member 82 and the meshing tooth 81a of the meshing tooth member 81 are engaged with each other. In this state, the rotation of the attachment 71 around the C axis is restricted.
From this state, the coupling / release member 78 is moved in the direction of the arrow D2. The movement of the coupling / release member 78 in the direction of the arrow D2 is performed by a driving means (not shown), for example, a hydraulic cylinder.
[0030]
When the coupling / release member 78 moves in the direction of the arrow D2, as shown in FIG. 4, the coupled state of the carbic coupling 62 is released, and the meshing tooth 82a of the meshing tooth member 82 and the meshing tooth member 81 mesh. The meshing with the teeth 81a is also released.
Thereby, the attachment 71 can rotate around the C axis.
At the same time, the tooth portion 73 formed on the main shaft 72 and the groove portion 74 formed on the coupling / release member 78 are engaged with each other, and the attachment 71 can be rotated by the main shaft 72.
[0031]
From this state, the main shaft 72 is rotated to a predetermined angle, that is, the rotation position at which the attachment 71 is to be indexed.
When the main shaft 72 is rotated, the coupling / release member 78 rotates while sliding with respect to the O-ring 75, and a sliding resistance acts on the outer peripheral surface 78 c of the coupling / release member 78 from the O-ring 75.
[0032]
When the main shaft 72 is rotated to a predetermined index position, the coupling / release member 78 is moved by the hydraulic cylinder in the direction of the arrow D1, that is, the direction in which the Kirbic coupling 62 is coupled.
When the coupling / release member 78 is moved in the direction of the arrow D1, the meshed state between the tooth portion 73 formed on the main shaft 72 and the groove portion 74 formed on the coupling / release member 78, that is, the main shaft 72 is maintained. In the state where the attachment 71 and the attachment 71 are coupled, the coupling / release member 78 does not rotate by the action of the sliding resistance from the O-ring 75.
[0033]
By moving the coupling / release member 78 in the direction of the arrow D1, first, the meshing tooth 82a of the meshing tooth member 82 and the meshing tooth 81a of the meshing tooth member 81 mesh.
As a result, even if the meshing state between the tooth portion 73 formed on the main shaft 72 and the groove portion 74 formed on the coupling / release member 78 is released, the coupling / release member 78 acts on the sliding resistance from the O-ring 75. Does not rotate by.
[0034]
When the meshing tooth 82a of the meshing tooth member 82 meshes with the meshing tooth 81a of the meshing tooth member 81, the meshing tooth 82a of the meshing tooth member 82 is formed along the C axis, so that the coupling / release member 78 rotates. Guided along the C-axis in a restricted state.
[0035]
Further, as the movement of the coupling / release member 78 in the direction of the arrow D1 proceeds, the meshed state between the tooth portion 73 formed on the main shaft 72 and the groove portion 74 formed on the coupling / release member 78 is released.
[0036]
When the coupling / release member 78 reaches a predetermined position in the direction of the arrow D1, the two ring-shaped members 62a and 62b of the carbide coupling 62 come into contact with each other and mesh with each other.
[0037]
As described above, according to the present embodiment, when the attachment 71 is rotated to a desired rotation position and then the coupling 62 is coupled to determine the index position, the tooth portion 73 formed on the main shaft 72 and Before the meshed state with the groove 74 formed in the coupling / release member 78 is released, the meshing tooth 82a of the meshing tooth member 82 and the meshing tooth 81a of the meshing tooth member 81 are meshed to restrict the rotation of the attachment 71. In addition, by guiding the attachment 71 in the C-axis direction with these, the coupling 62 can be reliably coupled at a desired index position.
As a result, even if the minimum indexing angle of the coupling 62 is reduced to, for example, 1 degree, it is possible to prevent the indexing defect around the C axis of the attachment 71 from occurring.
[0038]
FIG. 5 is a diagram showing a first embodiment of the attachment indexing device according to the present invention, and is a cross-sectional view showing the configuration of the indexing device for indexing around the B axis of the attachment 71 shown in FIG.
An attachment indexing device 90 shown in FIG. 5 includes a turning shaft 91 provided along the B axis of the attachment 71 and rotatably held by the attachment 71, a tool holding unit 100 fixed to the turning shaft 91, and It has a Kirvic coupling 92 that couples the attachment 71 and the tool holding unit 100, and a turning restriction guide mechanism 111 provided on one shaft end side of the turning shaft 91.
The turning restriction guide mechanism 111 corresponds to a specific example of turning restriction guide means of the present invention.
[0039]
The turning shaft 91 is disposed in a direction orthogonal to the main shaft 72 described above, and is coupled to the main shaft 72 by a transmission means such as a bevel gear.
Further, the turning shaft 91 is held so as to be movable in the directions of arrows E1 and E2 shown in FIG. 5. When the turning shaft 91 moves in the direction of the arrow E1, the turning shaft 91 and the main shaft 72 are coupled to each other. The turning shaft 91 also rotates according to the rotation. The revolving shaft 91 is moved in the directions of arrows E1 and E2 by a hydraulic cylinder (not shown).
On the other hand, when the turning shaft 91 moves in the direction of the arrow E2, the turning shaft 91 and the main shaft 72 are released, and instead, the tool T and the main shaft 72 are coupled.
[0040]
The Kirbic coupling 92 is composed of two ring-shaped members 92a and 92b, similar to the above-described Kirbic coupling 62. One ring-shaped member 92a is fixed to the tool holding unit 100, and the other ring-shaped member The member 92b is fixed to the attachment 71.
Convex teeth (convex teeth) that are the number of meshing teeth corresponding to the minimum indexing angle around the B axis of the tool holding unit 100 are formed on one of the opposing surfaces of the two ring-shaped members 92a and 92b. On the other side, concave teeth are formed to mesh with the convex teeth.
For example, when the minimum indexing angle around the B-axis of the tool holder 100 is 5 degrees, 72 concave teeth and convex teeth are formed, respectively, and when the minimum indexing angle is 1 degree, 360 concaves are formed. Teeth and convex teeth are formed respectively.
[0041]
The turning restriction guide mechanism unit 111 restricts the turning of the tool holding unit 100 before the connection between the turning shaft 91 and the main shaft 72 is released when the Kirvic coupling 92 shifts from the released state to the connected state. Guide in the B-axis direction.
Here, FIG. 6 is a cross-sectional view showing a specific structure of the turning restriction guiding mechanism 111, and FIG. 7 is a view showing the structure of the turning restriction guiding mechanism 111 seen from the direction of arrow A in FIG.
6 and 7, the turning restriction guide mechanism 111 includes a meshing tooth member 115 fitted and fixed to a shaft end projecting outside the attachment 71 of the turning shaft 91, and a further shaft end of the turning shaft 91. The abutting member 120 fitted and fixed to the side, the limit switch 150 for clamping confirmation and the limit switch 160 for checking unclamping, which are respectively secured to the outer surface of the attachment 71, and the shaft end of the turning shaft 91. And a meshing tooth member 130 provided on the outer surface of the attachment 71.
[0042]
The meshing tooth member 115 is a rotating body centered on the axis of the turning shaft 91, and the same number of meshing teeth 115 a as the meshing teeth of the above-mentioned carbic coupling 92 are formed along the outer periphery. The teeth 115 a are formed along the B-axis direction, and are formed at positions corresponding to the meshing teeth of the Kirvic coupling 92.
[0043]
The contact member 120 is a disk-shaped member centered on the axis of the pivot shaft 91, and includes inclined surfaces 120a and 120b that are inclined at a predetermined angle in opposite directions on the outer peripheral surface.
[0044]
The clamp confirmation limit switch 150 includes a contact member 151 at the tip, and the contact member 151 can contact the inclined surface 120 b of the contact member 120.
The limit switch 160 for confirming unclamping includes a contact member 161 at the tip, and the contact member 161 can contact the inclined surface 120 a of the contact member 120.
[0045]
As shown in FIG. 7, the meshing tooth member 130 is an arc-shaped member, and meshing teeth 130 a that mesh with the meshing tooth member 115 are formed on the inner peripheral portion. The meshing teeth 130a are formed along the B-axis direction.
[0046]
Next, an example of an indexing operation around the B axis of the tool holding unit 100 by the indexing device 90 having the above-described configuration will be described.
In the state shown in FIG. 5 and the state shown by the solid line in FIG.
Further, the meshing tooth 130a of the meshing tooth member 130 and the meshing tooth 115a of the meshing tooth member 115 are in mesh with each other, and the rotation of the turning shaft 91 around the B axis is restricted.
[0047]
From this state, when the turning shaft 91 is moved in the direction of arrow E1 by a hydraulic cylinder (not shown), first, the turning shaft 91 and the main shaft 72 are in a coupled state, and further, when the turning shaft 91 is moved in the direction of arrow E1, The meshing state between the meshing teeth 130a of the meshing tooth member 130 and the meshing teeth 115a of the meshing tooth member 115 is released. Also, the Kirvic coupling 92 is released.
Thereby, the turning shaft 91, that is, the tool holding unit 100 can turn about the B axis.
Further, by the movement of the turning shaft 91 in the direction of the arrow E1, the contact member 161 of the limit switch 160 for unclamping and the inclined surface 120a of the contact member 120 come into contact with each other. 72 is detected to be in a combined state.
[0048]
When the turning shaft 91 moves to a predetermined position in the direction of the arrow E1 and stops, the spindle 72 is driven to turn the tool holding unit 100 to a desired turning position.
After the tool holding unit 100 is swung to a desired swiveling position, the swiveling shaft 91 is moved in the direction of the arrow E2 this time in order to connect the Kirvic coupling 92.
[0049]
When the pivot shaft 91 moves in the direction of the arrow E2, first, the meshing tooth 130a of the meshing tooth member 130 and the meshing tooth 115a of the meshing tooth member 115 are released before the coupled state between the pivot shaft 91 and the main shaft 72 is released. Engage.
For this reason, a force that rotates due to the weight of the tool holder 100 acts on the swivel shaft 91, but the swivel shaft 91 has a meshing force between the meshing teeth 130 a of the meshing tooth member 130 and the meshing teeth 115 a of the meshing tooth member 115. Turning is restricted.
[0050]
When the turning shaft 91 further moves in the direction of the arrow E2, the tool holding unit 100 is guided in the B-axis direction in a state in which turning is restricted by the meshing of the meshing teeth 130a and the meshing teeth 115a. The combined state of is released.
[0051]
Further, when the turning shaft 91 further moves in the direction of the arrow E2, the Kirvic coupling 92 is coupled, and the indexing around the B axis is completed.
Further, due to the movement of the turning shaft 91 in the direction of the arrow E2, the contact member 151 of the clamp confirmation limit switch 150 and the inclined surface 120b of the contact member 120 come into contact with each other. Are detected to be in a combined state.
[0052]
As described above, according to the present embodiment, after the tool holding unit 100 is rotated to a desired turning position, when the coupling 92 is coupled and the indexing position is determined, the main shaft 72 and the turning shaft 91 are Before the coupled state is released, the meshing teeth 130a of the meshing tooth member 130 and the meshing teeth 115a of the meshing tooth member 115 are engaged to restrict the turning of the tool holding unit 100 due to its own weight, and by these, the tool holding unit By guiding 100 in the B-axis direction, the coupling 92 can be reliably coupled at a desired index position.
As a result, even if the minimum indexing angle of the coupling 92 is reduced to, for example, 1 degree, it is possible to prevent the occurrence of indexing failure around the B axis of the tool holder 100.
[0053]
In addition, this invention is not limited to embodiment mentioned above.
In the above-described embodiment, the meshing tooth member 82 is provided on the attachment 71 side and the meshing tooth member 81 is provided on the ram 61 side. However, the arrangement may be reversed.
Further, although the meshing teeth 81a of the meshing tooth member 81 are provided not in a ring shape but in pieces, it is also possible to form a ring shape.
In the above-described embodiment, the case where the present invention is applied to the attachment of the type shown in FIG. 1 has been described, but it is naturally possible to apply to other types of attachments.
[0054]
【The invention's effect】
According to the present invention, it is possible to prevent the occurrence of an indexing failure during indexing operation of an attachment attached to the tip of a ram of a machine tool, and it is possible to perform indexing accurately even if the minimum indexing angle of the attachment and the turning part is reduced. It becomes.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of an attachment to which an attachment indexing device of the present invention is applied.
FIG. 2 is a cross-sectional view showing a configuration of an indexing device that performs indexing around the C axis.
FIG. 3 is a view showing a positional relationship between a meshing tooth member 81 and a meshing tooth member 82;
FIG. 4 is a cross-sectional view for explaining the operation of an indexing device that performs indexing around the C axis.
FIG. 5 is a cross-sectional view showing the configuration of an indexing device that performs indexing about the B axis.
6 is a cross-sectional view showing a specific structure of a turning restriction guide mechanism in the indexing device of FIG. 6;
7 is a view showing a structure of a turning restriction guide mechanism portion viewed from the direction of arrow A in FIG.
FIG. 8 is a configuration diagram showing an example of a machining center.
[Explanation of symbols]
60, 90 ... Indexing device
61 ... Lamb
62 ... Kirvic coupling
71 ... Attachment
72 ... Drive shaft
73 ... Teeth
74: Groove
75 ... O-ring
78... Coupling / release member
80 ... Fixing member
82 ... meshing tooth member
82a ... meshing teeth
81 ... meshing tooth member
81a ... meshing teeth
91 ... Swivel axis
92 ... Kirvic coupling
100 ... Tool holder
111 ... Turning restriction guide mechanism
115 ... meshing tooth member
115a ... mesh teeth
120 ... Contact member
130 ... meshing tooth member
130a ... meshing teeth
150 ... Limit switch for clamp confirmation
160 ... Limit switch for unclamping confirmation

Claims (6)

An attachment indexing device for determining the rotational position of an attachment that is rotatably mounted around the axis of the ram at the tip of the ram of the machine tool,
A coupling having a number of meshing teeth according to the minimum indexing angle of the attachment for coupling and releasing the attachment and the ram by the movement of the attachment in the axial direction;
A drive shaft that is coupled to the attachment in response to the release of the coupling, and that is indexed by rotating the attachment around the axis;
Attachment rotation that guides the attachment in the axial direction while restricting rotation of the attachment around the axis before the coupling between the attachment and the drive shaft is released when the coupling transitions from the released state to the connected state An attachment indexing device comprising: a regulating means. The attachment rotation restricting means is provided on one of the attachment or the ram, and has the same number of meshing teeth as the meshing teeth of the coupling arranged in correspondence with the meshing teeth of the coupling along the circumference. A first meshing tooth member having;
A second tooth provided on the other of the attachment or the ram, and meshing with at least a part of the first meshing tooth member when the attachment and the ram are shifted from a released state to a coupled state; The attachment indexing device according to claim 1, further comprising an engagement tooth member. The attachment is coupled to the drive shaft, is provided so as to be releasable, and a swivel portion provided so as to be able to swivel around a swivel shaft rotated by the drive shaft;
A second coupling having a number of meshing teeth according to a minimum indexing angle of the swivel unit that couples and releases the attachment body and the swivel unit by movement of the swivel unit in the swivel axis direction;
When the second coupling shifts from the released state to the coupled state, it guides in the direction of the pivot axis while restricting the pivoting of the pivot section before the coupling between the pivot shaft and the drive shaft is released. The attachment indexing device according to claim 1, further comprising: a turning restriction guide unit. The turning restriction guide means is provided on one of the turning shaft and the attachment main body, and has the same number of meshing teeth as the meshing teeth of the coupling arranged in correspondence with the meshing teeth of the second coupling. A third meshing tooth member provided along a circumference; provided on the other of the pivot shaft and the attachment main body; and the first meshing with a transition from a released state to a coupled state of the attachment and the ram. The attachment indexing device according to claim 3, further comprising: a fourth meshing tooth member having a meshing tooth meshing with at least a part of the tooth member. An indexing device for determining a turning position of a turning portion provided so as to be turnable about a predetermined turning axis of an attachment attached to a tip of a ram of a machine tool,
A drive shaft that is built in the ram and is releasably coupled to the pivot shaft, and rotates the pivot shaft;
A coupling having a number of meshing teeth according to a minimum index angle of the swivel unit that couples and releases the attachment main body and the swivel unit by moving the swivel unit in the swivel axis direction;
When the coupling transitions from the released state to the coupled state, the turning restriction guide that guides the turning portion in the direction of the turning axis while restricting the turning of the turning portion before the connection between the drive shaft and the turning shaft is released. An attachment indexing device comprising: means. The turning regulation guide means is provided on one of the turning shaft and the attachment main body, and has the same number of meshing teeth as the meshing teeth of the coupling arranged in correspondence with the meshing teeth of the coupling on the circumference. A to-be-engaged tooth member,
An engagement tooth member provided on the other of the pivot shaft and the attachment main body and meshing with at least a part of the engagement tooth member as the attachment and the ram are shifted from a released state to a coupled state. Item 6. The attachment indexing device according to Item 5.

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