JP5972632B2 - 5-sided attachment - Google Patents

Description

  The present invention relates to a five-face machining attachment used in a machine tool such as a portal machining center or a vertical machining center.

  A portal machining center or a vertical machining center having a main shaft attached vertically has at least three linear axes (X axis, Y axis, and Z axis), and machining is basically performed while controlling the three axes. In recent years, in order to machine a complicated shape on a workpiece, a machining center that can add a rotation axis and an index axis by using an attachment in addition to three linear axes has been developed. It is also possible to perform a five-side machining that processes one side.

For example, in Patent Document 1, a clamp unit in which four collet chucks are arranged at equal intervals on the circumference is provided on the spindle head, and a pull stud is attached to an arm of an angle tool holder. Discloses a five-face machining attachment in which the angle tool holder can be indexed in units of 90 ° by gripping the pull stud.
However, the five-face machining attachment of Patent Document 1 has a drawback that it is not possible to perform indexing at a small angle.

  Patent Document 2 discloses a 5-face machining attachment in which a rotary indexing head is mounted on a ram of a machining center equipped with a four-corner clamp type clamping device and an indexing coupling member. In this attachment, the attachment can be attached to a ram of a machining center adopting a four-corner clamp method, and indexing at a small angle can be performed.

International Publication WO2011 / 030432 JP 2007-144578 A

  However, the attachment described in Patent Document 2 can be used only in a new type of machining center in which a clamp device and a coupling member for attaching the attachment are preliminarily provided in the ram, assuming that the attachment is attached. . An existing old type machining center based on performing three-axis machining has a problem that attachments cannot be attached.

  Therefore, the object of the present invention is to solve the problems of the prior art, and the existing main shaft, which is equipped with only three linear axes orthogonal to the X, Y and Z axes, is attached in the vertical direction. Another object of the present invention is to provide a five-face machining attachment that can mount an attachment swivelable indexable attachment at a small angle on a portal machining center or a vertical machining center.

In order to achieve the above-mentioned object, the present invention provides a five-face machining attachment that is attached to the tip of a ram of a machining center and processes a side surface in addition to the upper surface of a workpiece. A taper shank that transmits rotation of the main shaft provided in the ram, a transmission shaft that is detachably connected to the taper shank and that transmits the rotation of the main shaft to a horizontally supported tool holder, and is coaxial with the main shaft And an attachment swivel that swivels on a horizontal plane around the swivel axis, and supports the swivel axis, fixes the attack swivel at the indexed position, and releases the index. An attachment body having a coupling, and a body serving as an attachment fixing base that can be attached to the end face of the ram with a bolt; The attachment body portion and a clamping device the clamping means is incorporated in the main body detachably secured to said main body, the attachment swivel part is rotatably supported on the main shaft and coaxial, connectable with the tapered shank The transmission shaft comprising: a first shaft, and a second shaft that is rotatably supported so as to be orthogonal to the axis of the main shaft, and is connected to the first shaft via a gear and on which a tool holder is mounted. And the pivot axis that accommodates the first axis and is coaxial with the main axis, and the second axis can pivot in a plane orthogonal to the main axis around the pivot axis, and the attachment body part The transmission switching piston connected to the turning shaft and the rotation of the main shaft alternatively to one of the first shaft and the turning shaft according to the position of the transmission switching piston, Fixing of the attachment swivel part by engagement of the coupling, is characterized in that it has a, a transmission switching means for switching the unlocking by the mesh release.

1 is a front view of a portal machining center in which a five-face machining attachment according to the present invention is used. FIG. It is a perspective view which shows the ram of the portal machining center which mounted | wore the ram of the portal machining center with the 5-face machining attachment by one Embodiment of this invention. It is a perspective view which shows the clamp apparatus which comprises the 5th surface process attachment by one Embodiment of this invention, an attachment main body, and an attachment turning part. In FIG. 3, it is a perspective view which shows the ram of the portal machining center of the state which attached the clamp apparatus to the ram. FIG. 5 is a longitudinal sectional view of an attachment main body and an attachment turning unit in a state where a workpiece can be machined in the five-surface machining attachment according to the embodiment of the present invention. It is a longitudinal cross-sectional view of the attachment main body and the attachment turning part in the state which can be indexed in the 5-surface processing attachment by one Embodiment of this invention. It is a perspective view which shows the clamp apparatus of the 5th surface processing attachment by one Embodiment of this invention from the back side. It is a perspective view which shows the end surface of the ram to which a clamp apparatus is attached. It is sectional drawing which shows the operation | movement of the clamping / unclamping of a clamp apparatus.

Hereinafter, an embodiment of a five-face machining attachment according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 shows a portal machining center to which a five-side machining attachment according to the present invention is applied. In FIG. 1, reference numeral 10 indicates a bed and 11 indicates a column. A table 12 is installed on the bed 10, and a work is placed on the table 12. A cross rail 13 is laid across the gate column 11 horizontally. A ram 15 is vertically supported on the cross rail 13 via a saddle 14. The five-face machining attachment according to this embodiment is attached to the lower end of the ram 15.

  In this machining center, the saddle 14 moves in the horizontal direction along the guide of the cross rail 13, and its control axis is the Y axis. The ram 15 moves in the vertical direction, and its control axis is the Z axis. The table 12 is controlled by the X axis orthogonal to the Y axis and the Z axis. Reference numeral 16 is an automatic tool changer.

  Next, FIG. 2 is a perspective view showing a state in which the five-surface machining attachment according to the present embodiment is attached to the ram 15. This five-surface machining attachment can be roughly divided into attachment swivel that can turn on the horizontal surface about the main body 20 of the attachment main body 50 and the ram 15 extending in the vertical direction and can determine the turning position. It comprises a main portion 52 and a clamp device 54 for fixing the attachment main body 50 to the ram 15. FIG. 3 shows the clamping device 54 and the attachment main body part 50 attachment turning part 52 constituting the five-face machining attachment separately. FIG. 4 shows a state in which the clamp device 54 is attached to the ram 15.

Attachment swivel
Next, FIG. 5 is a view showing a longitudinal section of the attachment main body 50 and the attachment turning part 52. In FIG. 5, reference numeral 55 indicates a housing of the attachment turning unit 52. The attachment swivel unit 52 is supported as a main component as a transmission shaft that transmits the rotation of the main shaft 20 in a horizontal posture orthogonal to the first shaft 56 and the first shaft 56 supported coaxially with the main shaft 20. The second shaft 58 further includes a pivot shaft 62 for pivoting on a horizontal plane, and a clamp mechanism for clamping the tool holder 60 to the second shaft 58.

  A tapered hole 57 is formed at the tip of the second shaft 58, and a tool holder 60 holding a tool 59 is detachably attached to the tapered hole 57.

  In the housing 55 of the attachment turning portion 52, a hollow turning shaft 62 extending in a direction perpendicular to the axis of the housing 55 and coaxial with the main shaft 20 is provided integrally with the housing 55. An inner cylinder 63 is fixed inside the turning shaft 62, and a first shaft 56 is rotatably supported inside the inner cylinder 63 via a bearing 64.

  A taper shank 66 is attached to the attachment turning portion 52, and the taper shank 66 is arranged coaxially so as to contact the upper end portion of the first shaft 56. A tapered hole 67 is opened at the tip of the main shaft 20, and a tapered shank 66 is detachably fitted into the tapered hole 67. A pull stud 68 is attached to the end of the taper shank 66, and this pull stud 68 is gripped by a collet chuck 69. The collet chuck 69 is connected to a draw bar of a tool clamp mechanism (not shown) provided in the main shaft 20.

  A first key 70 for transmitting the rotation of the main shaft 20 is attached to the end surface of the main shaft 20, and the first key 70 is formed on the back surface of the flange portion 71 at the tip of the tapered shank 66. The key groove 72 is fitted.

The rotation of the main shaft 20 is transmitted to the second shaft 58 by the following transmission key and gear.
A second key groove 73 is formed on the end surface of the flange portion 71 of the taper shank 66, and the key groove 73 has an upper surface of the first shaft 56 when the entire attachment turning portion 52 is raised as will be described later. A second key 74 attached to the end face is fitted. The second key 74 and the key groove 73 constitute a first connecting means for connecting the tapered shank 66 and the first shaft 56.

  The second shaft 58 is rotatably supported via bearings 75 and 76 inside the housing 55. A bevel gear 77 is fixed to the second shaft 58, and a bevel gear 78 fixed to the lower end portion of the first shaft 56 is engaged with the bevel gear 77.

Next, the internal structure of the second shaft 58 will be described. A tool clamping mechanism for clamping the tool holder 60 is incorporated in the second shaft 58 as follows.
A draw bar 80 is inserted into the inner diameter portion of the second shaft 58. A collet chuck 81 is connected to the tip of the draw bar 80. A pull stud 82 held by a collet chuck 81 is provided at the tail end of the tool holder 60. The draw bar 80 is biased in the direction in which the tool holder 60 is retracted by the elastic force of the disc spring 83, and the tool holder 60, which has held the pull stud 82 by the collet chuck 81, has the second force due to the elastic force of the disc spring 83. It is pressed against the end face of the shaft 58 and fixed.

  At the rear end of the draw bar 80, a tool unclamping cylinder 84 for attaching / detaching the tool holder 60 from the tip of the second shaft 58 during automatic tool change is attached. The piston 85 and the draw bar 80 of the tool unclamp cylinder 84 are arranged coaxially. In this case, when pressure oil is supplied to the cylinder chamber 86, the piston 85 pushes the draw bar 80 against the elastic force of the disc spring 83, whereby the pull stud 82 is detached from the collet chuck 81. Therefore, the tool holder 60 can be unclamped and removed. On the contrary, if the pressure oil is discharged from the cylinder chamber 86, the tool holder 60 is clamped by the elastic force of the disc spring 83 as described above (see FIG. 6).

Attachment Main Body Next, the internal structure of the attachment main body 50 will be described.
The attachment main body 50 is switched from an operation mode in which the rotation of the main shaft 20 is transmitted to the second shaft 58 to cut the workpiece to an operation mode in which the attachment turning unit 52 can be indexed, or the attachment turning unit 52 is indexed. Thereafter, a switching mechanism for switching the workpiece to an operation mode capable of cutting is provided as follows.

  In FIG. 5, an attachment main body 50 fixes, as main components, a cylinder 92, an upper cover 91, a rear cover 93, and an attachment turning portion 52 that constitute a cylinder mechanism including a transmission switching piston 90 at an index position. Including Kirby couplings 97, 98.

  A transmission switching piston 90 is slidably fitted to a cylinder 92 constituting the attachment main body 50. A rear cover 93 is fixed to the lower portion of the cylinder 92. A first oil chamber 94 is formed between the lower end surface of the transmission switching piston 90 and the rear cover 93. In addition, a step portion 95 having a small inner diameter and a step is formed in the inner diameter portion of the cylinder 92, and a second oil chamber 96 is formed by the step portion 95 and the large diameter portion 90 a of the piston 90. Yes.

  An upper cover 91 is fixed to the upper end portion of the cylinder 92. A hole 87 in which the main shaft is loosely fitted is formed at the center of the upper cover 91. Also, on the lower surface of the upper cover 91, one of the Kirvic couplings (registered trademark of US Cresson) 97 is fixed as an indexing coupling member. The other Kirbic coupling 98 is fixed to the upper end portion of the transmission switching piston 90 so as to face this. The Curbic couplings 97 and 98 are index coupling couplings that can set an indexing angle (for example, 1 °, 5 °) according to the number of teeth formed by dividing the circumference equally.

  The transmission switching piston 90 is connected to the turning shaft 62 of the attachment turning portion 52 by a bolt 99 and is configured to turn together with the turning shaft 62. When the attachment swivel unit 52 is indexed, the ring member 101 in which a plurality of claws 100 for transmitting the rotation of the main shaft 20 to the swivel shaft 62 is arranged in the circumferential direction is an inner cylinder 63 inside the swivel shaft 62. It is attached to the top surface of the. A plurality of grooves 102 engaged with the claws 100 are arranged in the circumferential direction in the flange portion 71 at the tip of the tapered shank 66 attached to the main shaft 20. Such claws 100 and grooves 102 constitute second connecting means for connecting the taper shank 66 and the pivot shaft 62.

  Here, the relationship between the stroke of the transmission switching piston 90, the second key 74 that transmits the rotation of the main shaft 20 to the first shaft 56, and the claw 100 that transmits the rotation of the main shaft 20 to the turning shaft 62 is as follows. It has become.

  FIG. 5 shows the positions of the second key 74 and the claw 100 when the transmission switching piston 90 is at the highest position (first position). At this time, the entire attachment turning portion 52 is lifted together with the transmission switching piston 90, and the second key 74 is engaged with the second key groove 73. At the same time, the claw 100 is detached from the groove 102. At the same time, the Kirbic couplings 97 and 98 come to mesh with each other, the attachment turning part 52 is fixed at the indexed position, and the rotation of the main shaft 20 is made through the second key 74 to the first. Transmission to the shaft 56 becomes possible.

  On the other hand, FIG. 6 shows the positions of the second key 74 and the claw 100 when the transmission switching piston 90 is at the lowest lowered position (second position). In this case, the entire attachment turning portion 52 is lowered together with the transmission switching piston 90, and the second key 74 is detached from the second key groove 73. On the other hand, the claw 100 is engaged with the groove 102, but the position of the claw 100 is set so that the second key 74 is engaged with the groove 102 before completely disengaging from the second key groove 73. Therefore, the phase between the second key 74 and the second key groove 73 is maintained. In this state, the carpic couplings 97 and 98 are disengaged, so that the rotation of the main shaft 20 can be transmitted to the turning shaft 62 via the claw 100 to rotate the attachment turning portion 52 to a desired indexing position. It becomes a state.

Clamping device
Next, the clamp device 54 for attaching the attachment main body 50 to the ram 15 will be described.
First, FIG. 7 is a view showing the clamping device 54 from the back side in a state where the clamping device 54 is connected to the attachment main body 50. FIG. 8 is a view showing a lower end surface of the ram 15 to which the clamp device 54 is attached.

  The clamp device 54 is a short prismatic member corresponding to the cross-sectional shape of the ram 15, and has a main body 110 that also serves as a fixing base for fixing the attachment main body 50. A hole 111 into which the main shaft 20 protruding from the end face of the ram 15 is inserted is formed at the center of the main body 110. Then, four clamp units 112 for fixing the attachment main body 50 are incorporated in the four corners of the main body 110, respectively.

  A plurality of bolt holes 113 penetrating in the thickness direction are formed in the main body 110 of such a clamp device 54. A plurality of female screws 130 are also formed on the end face of the ram 15 at positions corresponding to the bolt holes 113.

  As shown in FIG. 7, a hydraulic manifold 114 that distributes the pressure oil to be operated to each clamp unit 112 is attached to the side surface of the main body 110. The hydraulic manifold 114 is provided with a male hydraulic coupler 115 as a pipe joint. On the other hand, as shown in FIG. 8, the required number of primary side hydraulic pipes 116 connected to the hydraulic system of the machine tool extend to the end face of the ram 15 on the side surface of the ram 15. A female joint 117 is attached to the end of the hydraulic pipe 116. These female joints 117 are held by brackets 118 at intervals corresponding to the arrangement intervals of the hydraulic couplers 115.

  When the clamp device 54 is attached to the end surface of the ram 15, the main body 110 of the clamp device 54 can be attached to the end surface of the ram 40 by screwing a bolt (not shown) inserted from the bolt hole 113 into the female screw 114. At this time, the primary side hydraulic piping 116 is also connected to the hydraulic manifold 114 at the same time. From the hydraulic manifold 114, a secondary hydraulic pipe 118 that supplies pressure oil extends to each clamp unit 112. Further, pressure oil is also supplied from the hydraulic manifold 114 to the attachment body 50.

  Next, FIG. 9 is a diagram illustrating a clamping operation and an unclamping operation of the clamp unit 112. A clamp ring 120 is fixed to the upper surface of the upper cover 91 of the attachment main body 50. In the clamp unit 112 of this embodiment, a plurality of steel balls 122 arranged in the circumferential direction on the holder 121 at the tip end portion. Is attached to the clamp ring 120 so that the attachment main body 50 is fixed.

  The clamp unit 112 has a built-in rod that pushes out the steel ball 122 by the force of the spring, and the steel ball 122 is pushed out to a radius and engaged with the clamp ring 120, as shown in FIG. 9B. The attachment body 50 is in a clamped state.

  In addition, the clamp unit 112 has a built-in hydraulic cylinder for unclamping. When pressure oil is supplied to the hydraulic cylinder, the steel ball 112 is retracted as shown in FIG. The clamp state can be released.

  The five-surface attachment according to the present embodiment is configured as described above, and the operation and effect thereof will be described next.

Attachment of attachment When the portal machining center is a machine tool having only three X-axis, Y-axis, and Z-axis linear axes as in this embodiment, the portal machining center originally has a five-face machining attachment. It is not planned to use it to perform 5-face machining on workpieces. For this reason, although there is no provision for attaching a five-surface machining attachment to the lower end surface of the ram 15, the five-surface machining attachment of the present embodiment can be mounted on the ram 15 as follows.

  As shown in FIG. 4, a clamp device 54 is attached to the lower end surface of the ram 15 in advance using bolts. At this time, the attachment main body 50 and the attachment turning part of the five-surface machining attachment are combined together and placed on an attachment stocker (not shown) and waiting. Then, the primary hydraulic piping 116 extending from the hydraulic system of the machining center is connected to the hydraulic manifold 114 of the clamp device 54.

  Therefore, if the ram 15 is lowered until the clamp device 54 comes into contact with the attachment main body 50 of the five-surface machining attachment placed on the attachment stocker, and then the clamp device 54 is operated by a command from the NC device, Attachments can be installed automatically.

  Thus, on the machining center side, no special structure or device for mounting the attachment is required, and the hydraulic piping 116 is extended from the machining center hydraulic system to the lower end surface of the ram 15, and the clamp device is then bolted. If 54 is fixed to the ram 15, the clamp device 54 can be operated. For this reason, even in an existing machining center that originally does not plan to use a 5-sided machining attachment, the 5-sided machining attachment of this embodiment can be automatically attached.

Indexing attachment swivel
Next, with reference to FIG. 5 and FIG. 6, the operation for determining the attachment turning unit 52 will be described.
FIG. 5 shows a longitudinal section of the attachment when the side surface of the workpiece is machined with the tool 59. Pressure oil is supplied to the first oil chamber 94 in the attachment main body 50, and the transmission switching piston 90 is at the upper limit position of the stroke. In this state, the second key 74 is engaged with the second key groove 73, and the claw 100 is detached from the groove 102. Accordingly, the rotation of the main shaft 20 is transmitted to the first shaft 56 via the second key 74 and further transmitted from the first shaft 56 to the second shaft 58 via the bevel gears 78 and 77 to rotate. The side surface of the workpiece can be cut with the tool 59.
When machining another side surface of the workpiece, the main shaft 20 is stopped and then the pressure oil is supplied to the second oil chamber 96 as shown in FIG. The transmission switching piston 90 is lowered to the lower limit position of the stroke, and the entire attachment turning unit 52 is lowered by the stroke. In this process, when the second key 74 is coming out of the second key groove 73, the claw 100 first engages with the groove 102. Then, the second key 74 is completely detached from the second key groove 73. As a result, the phase of the second key 74 and the second key groove 73 is maintained in preparation for the next engagement. In this state, since the carpic couplings 97 and 98 are disengaged, it is possible to transmit the rotation of the main shaft 20 to the turning shaft 62 via the claw 100 and to turn the attachment turning portion 52 to a desired indexing position. It becomes a state.

  Thereafter, the spindle 20 is slowly rotated, and when the attachment turning unit 52 turns to a desired index position, the spindle 20 is stopped. Then, as shown in FIG. 5, the pressure oil is supplied to the first oil chamber 94 and the transmission switching piston 90 moves up to the upper limit position of the stroke. As a result, the Kirbic couplings 97 and 98 mesh with each other, and the attachment turning part 52 is firmly fixed at the index position. In addition, since the teeth that mesh with each of the Kirvic couplings 97 and 98, for example, in units of 1 ° or 5 °, are formed, the indexing can be performed at a fine angle.

  When the indexing is finished in this way, the claw 100 is detached from the groove 102. Since the second key 74 is engaged with the second key groove 73, the rotation of the main shaft 20 is switched to the state transmitted to the second shaft 58. Thereafter, the side surface of the workpiece is machined at the determined position.

  In this way, all of the four side surfaces of the workpiece can be machined by changing the attachment turning part 52 to the desired index position one after another.

In the present embodiment, the second shaft 58 of the attachment swivel unit 52 is connected to the tool unclamp cylinder 84, so that the tool holder 60 can be attached and detached using an automatic tool changer. It is possible to change tools during machining.

  Of course, automatic tool change can be performed when the five-face machining attachment is not attached. While the five-surface machining attachment is not used, the attachment main body 50 and the attachment turning portion 52 are integrally stored in the attachment stocker, and can be automatically replaced with this five-surface machining attachment when necessary.

  As described above, the five-face machining attachment according to the present invention has been described with reference to the embodiment applied to the portal machining center. However, in the five-face machining attachment according to the present invention, the main shaft is vertically attached like the portal machining center. It is also applicable to existing vertical machining centers.

  DESCRIPTION OF SYMBOLS 10 ... Bed, 11 ... Column, 12 ... Table, 13 ... Cross rail, 14 ... Saddle, 15 ... Ram, 50 ... Attachment main-body part, 52 ... Attachment turning part, 54 ... Clamp apparatus, 56 ... 1st axis, 58 ... Second axis, 59 ... tool, 74 ... second key, 84 ... tool unclamping cylinder, 90 ... transmission switching piston, 94 ... first oil chamber, 96 ... second oil chamber, 97, 98 ... Kerbic coupling, 100 ... Claw, 112 ... Clamp unit, 114 ... Hydraulic manifold

Claims (7)

Attaching to the tip of the ram of the machining center, in the 5-sided machining attachment for machining the side surface in addition to the upper surface of the workpiece,
A taper shank that is attached to the tip of the ram and transmits rotation of a main shaft provided in the ram to the attachment;
A transmission shaft that transmits the rotation of the main shaft to a horizontally supported tool holder that is detachably connected to the taper shank, and a swivel shaft that is coaxial with the main shaft, and is arranged on a horizontal plane around the swivel shaft. A swivel attachment swivel;
An attachment main body having an index coupling for supporting the pivot shaft, fixing the attack pivot section at the indexed position, and releasing it;
A clamp device in which a clamp means for fixing the attachment main body portion to the main body is detachably fixed to the main body, the main body serving as an attachment fixing base that can be attached to the end face of the ram with a bolt.
The attachment turning part
A first shaft that is rotatably supported coaxially with the main shaft and can be connected to the tapered shank, a tool that is rotatably supported to be orthogonal to the axis of the main shaft, and is connected to the first shaft via a gear. A second shaft on which a holder is mounted at the tip, and the transmission shaft,
The swivel shaft accommodating the first shaft and coaxial with the main shaft;
The second axis can be swiveled in a plane orthogonal to the main axis around the swivel axis;
The attachment main body part alternatively transmits a transmission switching piston connected to the turning shaft and the rotation of the main shaft to one of the first shaft and the turning shaft according to the position of the transmission switching piston. At the same time, the five-surface machining attachment includes transmission switching means for switching between fixing of the attachment swivel portion by engagement of the indexing coupling and releasing of fixation by releasing the engagement. The transmission switching means
Between a first position for transmitting the rotation of the main shaft from the tapered shank to the first shaft and a second position for transmitting the rotation of the main shaft from the tapered shank to the pivot shaft. The transmission switching piston moving in the axial direction of the main shaft;
First connecting means that engages and connects the tapered shank and the first shaft when the transmission switching piston moves to the first position;
Second connection means for engaging and connecting the tapered shank and the pivot shaft when the transmission switching piston moves to the second position;
The five-face machining attachment according to claim 1 , comprising: The index coupling includes a pair of couplings in which a large number of teeth are arranged at equal intervals around the circumference, one coupling is attached to the transmission switching piston, and the other coupling is 5-sided machining attachment according to claim 1, characterized in that it is fixed to the upper cover constituting the attachment body portion so as to face the one of the coupling.   The five-surface machining attachment according to claim 1, wherein the clamp device includes clamp units that clamp the attachment main body at four corners of the main body. The clamp device includes a hydraulic manifold attached to a tip of the ram and connected to a hydraulic pipe extending from a hydraulic system of a machining center, and supplies hydraulic oil from the hydraulic manifold to each clamp unit and attachment main body. The five-surface machining attachment according to claim 4 , wherein the branching is made to branch. The five-face machining attachment is attached to the lower end surface of the ram via the clamp device with a portal or vertical machining center having a main shaft attached in a vertical direction, and the attachment swivel portion swivels in a horizontal plane. The five-surface machining attachment according to any one of claims 1 to 5 . The 5-face machining attachment according to claim 6 , wherein the portal or vertical machining center is a machining center having only three axes of an X axis, a Y axis, and a Z axis.

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