JP5738099B2 - Machine tool and machining method using the same - Google Patents

Description

  The present invention relates to a machine tool for machining a workpiece with a plurality of tools provided on a multi-axis head, and a machining method using the machine tool.

  Various structural members such as an engine cylinder block and a transmission case mounted on a vehicle use, for example, a machine tool including a multi-axis head (also referred to as a gang head) provided with a plurality of tools. It is made by machining the workpiece. As shown in FIG. 6 of Patent Document 1, this type of machine tool has a multi-axis head and a work holding plate for holding a work, and usually a guide bar is provided on the multi-axis head. A guide bush is provided on the work holding plate.

  When machining the workpiece, for example, the multi-axis head is brought close to the workpiece holding board. Since the guide bar enters and engages with the guide bush during this approach, the multi-axis head further approaches the work holding plate while being guided by the guide bar and the guide bush. When the distance between the multi-axis head and the work holding plate is a predetermined distance, the work is machined by a tool that has been rotated in advance.

  Here, when it is desired to form a screw hole in the workpiece, as shown in FIGS. 8A and 8B, a pilot hole forming process and a tapping process are performed. That is, first, the drill 1 shown in FIG. 8A is embedded in the work 2 while rotating, and a pilot hole forming process is performed. As a result, the pilot hole 3 is formed as shown in FIG. 8B.

  Next, the threading tap 4 is made to enter the pilot hole 3. As a result, tapping is performed, and the screw portion 5 is formed on the side wall of the prepared hole 3 as shown in FIG. 8C. That is, the pilot hole 3 becomes the screw hole 6.

  Finally, chamfering is performed on the opening of the screw hole 6 with the chamfering tool 7 shown in FIG. With this step, the screw hole forming process is completed.

  As can be understood from the above description, at least three types of tools are required to form one screw hole 6. That is, a large number of tools must be prepared. Therefore, particularly when a plurality of screw holes 6 are simultaneously formed by a machine tool, the capital investment is remarkably increased.

  Moreover, in this case, after using the multi-axis head to which the drill 1 is attached, the multi-axis head to which the threading tap 4 is attached must be replaced, and further, the multi-axis head to which the chamfering tool 7 is attached must be replaced. That is, at least three multi-axis heads are required. This also contributes to soaring capital investment.

  Furthermore, since a predetermined time is required to replace the multi-axis head, the cycle time from the start to the end of the screw hole forming process is shortened, in other words, the screw holes are efficiently formed. It is not easy.

  In order to avoid such a problem, the present applicant has proposed a threading tool capable of performing all of drilling, tapping and chamfering in Patent Document 2. According to this thread cutting tool, as shown in FIG. 10 and FIG. 11 of Patent Document 2, pilot hole forming processing is performed at the time of forward movement for embedding the thread cutting tool in the workpiece, and the thread cutting tool is It is possible to perform tapping and chamfering at the time of the backward movement to be detached from the head.

  Here, as shown in FIG. 10C of Patent Document 2, in order to form a screw portion on the side wall of the pilot hole, the rotation center of the thread cutting tool is offset from the central axis of the pilot hole. Need to rotate. In order to realize this, it is conceived that the tool is contoured, and for this purpose, it is necessary to contour the multi-axis head.

  However, a general machine tool is configured such that the multi-axis head can only move forward or backward relative to the work holding plate (or the work holding plate can move forward or backward relative to the multi-axis head). Therefore, the tool can only advance or retreat with respect to the workpiece. That is, normally, the machine tool is configured so as to be able only to perform the plunging process, and is not configured to perform the contouring process.

  In addition, in order to form a precise screw hole, it is necessary to perform a contouring operation while controlling a multi-axis head, which is a heavy object and large in shape, with high accuracy. Doing it itself is not easy.

  Patent Document 3 discloses a machine tool having a multi-axis head that can rotate in a state where a tool is eccentric. In this method, the tool is rotated by the first rotation driving means, and the tool is revolved by the second rotation driving means, whereby the tool is rotated in an eccentric state (that is, a contouring operation is performed).

  According to this machine tool, since only the tool performs the contouring operation, it is assumed that tapping can be performed subsequent to the drilling without exchanging the tool.

JP-A-7-164222 Japanese Patent No. 3831167 JP-A-5-57513

  In the technique described in Patent Document 3, a mechanism for performing a contouring operation is provided in all the tools. This complicates the configuration of the machine tool.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a machine tool capable of performing contouring processing with a simple configuration and a processing method using the machine tool.

In order to achieve the above object, the present invention is a machine tool comprising a multi-axis head provided with a tool, and a work holding plate for holding a work to be processed by the tool,
A support that supports the multi-axis head via an elastic member that is elastically deformable in the direction of the contouring operation ;
A first guide engaging member provided on the multi-axis head;
A second guide engaging member that is provided on the work holding plate and engages with the first guide engaging member when the multi-axis head approaches the work holding plate relatively;
An eccentric spindle externally fitted to the second guide engaging member;
Said By rotating the eccentric spindle, the second guide engaging member can Rukoto to perform the contouring operation is rotated at an eccentric state the polyaxial head a rotary drive means,
It is characterized by having.

  In this configuration, when the first guide engaging member and the second guide engaging member are engaged with each other, when the eccentric spindle is rotated under the action of the rotation driving means, the eccentric spindle is externally fitted. 2 The guide engaging member rotates in an eccentric state. For this reason, the first guide engaging member engaged with the second guide engaging member is displaced so that the locus thereof is circular. In other words, revolves.

  Along with this, the multiaxial head provided with the first guide engaging member, and consequently the tool provided on the multiaxial head also revolves. In this way, the tool performs a revolving motion in addition to the rotation motion, so that the tool performs a contouring operation. For this reason, it becomes possible to implement the contouring process without exchanging tools.

  Of course, when the rotation driving means is not energized, the eccentric spindle does not rotate. Accordingly, at this time, not the contouring process but the plunging process is performed.

  In short, according to the machine tool of the present invention, it is possible to selectively carry out the plunging process and the contouring process with one type of tool. Moreover, in order to perform the contouring process, it is only necessary to provide an eccentric spindle and a rotation driving means for rotating the eccentric spindle, so that the configuration is prevented from becoming complicated.

  Since the plunging process and the contouring process can be performed with one type of tool, it is not necessary to replace the tool for performing the plunging process with the tool for performing the contouring process. Therefore, it is not necessary to prepare many kinds and many tools. In addition, it is not necessary to replace the multi-axis head provided with the tool for performing the plunging process with the multi-axis head provided with the tool for performing the contouring process. For this reason, the number of multi-axis heads can be reduced. For these reasons, capital investment is reduced.

  Further, as described above, it is not particularly necessary to replace the multi-axis head, so that the time from the start to the end of machining can be shortened by the amount required for the replacement operation of the multi-axis head. That is, processing can be performed efficiently.

The contouring process can be performed, for example, when the multi-axis head is relatively separated from the work holding plate. That is, the rotation driving means is driven while the first guide engaging member is engaged with the second guide engaging member. Accordingly, as described above, the second guide engaging member rotates in an eccentric state, and the multi-axis head performs a contouring operation.

  On the other hand, when the multi-axis head is relatively close to the work holding plate, the contouring process may be performed in the same manner as described above, or the plunging process may be performed. Even in this case, since the first guide engaging member and the second guide engaging member are engaged with each other, the rotation driving means may be stopped without being biased as described above. As a result, the eccentric spindle remains stopped, so that the first guide engaging member, and hence the multi-axis head, does not revolve, and therefore the tool does not perform the contouring operation.

  As a preferred example of performing plunging when the multi-axis head is relatively close to the work holding plate and performing contouring when being relatively separated from each other, there is a screw hole forming process. . That is, after a pilot hole is formed in the workpiece by plunging, the multi-axis head is revolved to displace the tool in a direction away from the pilot hole while performing a contouring operation. Thereby, a screw part is screwed with respect to the side wall of the said pilot hole.

Further, the present invention is to process a workpiece held on a workpiece holding plate by a tool provided on a multi-axis head supported by a support via an elastic member that can be elastically deformed in the direction of contouring operation. A processing method using a machine tool,
When the multi-axis head relatively approaches the work holding plate, a first guide engaging member provided on the multi-axis head and an eccentric spindle provided on the work holding plate are externally fitted. Engaging the second guide engaging members with each other and applying a first machining to the workpiece with the tool;
When said multi-axis head is relatively away from the said work holding plate, while the first guide engaging member relative to said second guide engagement member is engaged, the rotational drive means By rotating the eccentric spindle by driving , the second guide engaging member is rotated in an eccentric state to cause the multi-axis head to perform a contouring operation. A process of contouring that is a process of
It is characterized by having.

  As described above, according to the present invention, the lower processing (first processing) and the main processing (second processing) by the contouring processing can be performed while the tool reciprocates once. In addition, since both the first machining and the second machining can be performed with the same tool, it is necessary to prepare many types and many tools, and a multi-axis head to which different tools are attached is prepared. There is no need. Therefore, it is possible to efficiently perform processing while reducing capital investment.

  The first process may be a contouring process similar to the second process, but a plunging process may be performed. In this case, even if the first guide engaging member and the second guide engaging member are engaged with each other when the multi-axis head relatively approaches the work holding plate, the eccentric spindle is rotated. If there is no.

  As described above, as a preferred example of performing the plunging process when the multi-axis head is relatively close to the work holding plate and performing the contouring process when the multi-axis head is relatively separated from each other, A hole forming process is mentioned.

  According to the present invention, the first guide engaging member is engaged with the second guide engaging member of the work holding plate by the eccentric spindle and the rotation driving means for rotating the eccentric spindle. Since the head is caused to revolve, it is possible to perform contouring with a tool provided on the multi-axis head. That is, while having a simple configuration, the plunging process and the contouring process can be selectively performed with one type of tool.

  For this reason, it is not necessary to prepare many types and many tools, or to prepare a multi-axis head to which different tools are attached. Therefore, the capital investment is reduced.

  Further, since it is not necessary to replace the multi-axis head, the cycle time from the start to the end of the processing can be shortened accordingly, and the processing can be performed efficiently after all.

It is a principal part schematic perspective view of the machine tool which concerns on embodiment of this invention. It is a side view of the thread cutting tool used as a tool in this Embodiment. It is a front view of the thread cutting tool of FIG. It is a principal part longitudinal cross-sectional view of the workpiece holding board which comprises the machine tool of FIG. 5A and 5B are partial longitudinal sectional front views showing a process until a pilot hole is formed by plunging using the tool shown in FIG. 2, and FIG. 5C shows the tool performing a contouring operation. It is the partial longitudinal cross-section front view which showed the state which started (it started the thread part formation). It is the model front view which showed typically the process of rotating operation in the state where the eccentric spindle was eccentric. 7A and 7B are partial longitudinal sectional front views showing a process until the thread portion is formed by the contouring process using the tool shown in FIG. 2, and FIG. 7C is a chamfering process performed by the tool. It is the partial longitudinal cross-section front view which showed the state. 8A to 8C are partial longitudinal sectional front views showing a process from formation of a pilot hole to formation of a chamfered portion in a screw hole forming process according to a conventional technique.

  Hereinafter, preferred embodiments of the machining method according to the present invention will be described in detail in relation to a machine tool for carrying out the machining method, with reference to the accompanying drawings.

  FIG. 1 is a schematic perspective view of a main part of a machine tool 10 according to the present embodiment. The machine tool 10 includes a multi-axis head 14 provided with a plurality of tools 12 and a work holding plate 18 that holds a work 16 to be processed by the tool 12. The multi-axis head 14 and the work holding plate 18 are actually opposed to each other on the same axis, but in FIG. 1, in order to clarify the configuration of the machine tool 10, The holding plate 18 is intentionally tilted slightly.

  The multi-axis head 14 can move forward and backward so as to approach or separate from the workpiece holding plate 18 that is positioned and fixed. That is, in the present embodiment, the multi-axis head 14 is a movable platen, while the work holding plate 18 is a fixed platen.

  The machine tool 10 further includes a guide table 20. Two rails 22a and 22b are laid on the upper end surface of the guide table 20, and a head support board 24 (support) is slidably engaged with the rails 22a and 22b.

  In the vicinity of the four corners on one end face of the head support plate 24, rods 26a to 26d constituting a displacement cylinder (not shown) are connected. On the other hand, the multi-axis head 14 is supported on the remaining one end face of the head support board 24 via a plurality of coil springs 28 (elastic members). Accordingly, the multi-axis head 14 is displaced so that the head support plate 24 approaches or separates from the work holding plate 18 as the displacement cylinder is biased and the rods 26a to 26d move forward and backward. Then, the head support plate 24 is displaced integrally. Of course, at this time, the head support plate 24 is displaced (advanced or retracted) along the rails 22a and 22b.

  The multi-axis head 14 can vibrate relative to the head support plate 24 within the range of elasticity of the coil spring 28.

  The multi-axis head 14 is provided with a machining motor (not shown). The rotating shaft of the machining motor is connected to the spindle 30 accommodating the tool 12 through a gear train (not shown) inside the multi-axis head 14. That is, the tool 12 rotates as the rotating shaft and the spindle 30 rotate following the energization of the machining motor.

  In this Embodiment, the tool 12 is comprised based on the thread cutting tool shown by the said patent document 2 except the chamfer part formation part 31 being formed. That is, as shown in FIGS. 2 and 3, the thread cutting tool has a front rake face 32 and a side rake face 34, a drill blade 36 and a thread cutting edge 38, a front flank face 40 and a side flank face 42, Furthermore, although the oil hole 44 is formed, since this structure is well-known by patent document 2, the further detailed description is abbreviate | omitted.

  The thread cutting blade 38 is continuous with a long body 45 having a smaller diameter than the thread cutting blade 38. The chamfered portion forming portion 31 is connected to the body 45. The chamfered portion forming portion 31 is formed so as to expand in a tapered shape.

  In the multi-axis head 14, two guide bars 46 a and 46 b as first guide engaging members are provided on the surface (processed surface) on which the tool 12 is provided. That is, the guide bars 46 a and 46 b extend toward the work holding plate 18 in the same manner as the tool 12.

  On the other hand, insertion holes 48a and 48b are formed in the work holding plate 18 at positions corresponding to the positions of the guide bars 46a and 46b. As shown in FIG. 4, guide bushes 52a and 52b, into which eccentric spindles 50a and 50b are fitted, are inserted into these insertion holes 48a and 48b. A bearing 54 is interposed between the side walls of the insertion holes 48a and 48b and the eccentric spindles 50a and 50b, and a spacer 56 is interposed between the eccentric spindles 50a and 50b and the guide bushes 52a and 52b.

  As will be described later, guide bars 46a and 46b enter and engage with guide bushes 52a and 52b having a substantially cylindrical body. That is, the guide bushes 52a and 52b serve as second guide engaging members.

  As is well known, the eccentric spindles 50a and 50b are spindles that rotate in an eccentric state. That is, as shown in FIG. 1, the centers of the insertion holes 58 formed in the eccentric spindles 50a and 50b are offset from the centers of the insertion holes 48a and 48b into which the eccentric spindles 50a and 50b are inserted. On the other hand, the centers of the through holes 60 of the guide bushes 52a and 52b coincide with the centers of the insertion holes 58 of the eccentric spindles 50a and 50b.

  Contouring motors 62a and 62b are disposed in the vicinity of the eccentric spindles 50a and 50b. That is, two motor support holes 64a and 64b are formed through the work holding plate 18 along the thickness direction, and the motors 62a and 62b for contouring are fitted into the motor support holes 64a and 64b. (See FIGS. 1 and 4).

  The first pulleys 68a and 68b are fitted to the rotating shafts 66a and 66b of the contouring motors 62a and 62b. Second pulleys 70a and 70b are fitted on the eccentric spindles 50a and 50b, and timing belts 72a and 72b are wound around the second pulleys 70a and 70b and the first pulleys 68a and 68b.

  The work holding board 18 is further provided with clamp claws 74 a and 74 b for holding the work 16. The clamp claws 74a and 74b can be opened and closed. The workpiece 16 is held when the clamp claws 74a and 74b are closed, and the workpiece 16 is released when the clamp claws 74a and 74b are opened.

  The workpiece 16 is exemplified by a cylinder block, a cylinder head, a mission case, or the like that constitutes an internal combustion engine mounted on a vehicle.

  The machine tool 10 according to the present embodiment is basically configured as described above. Next, the function and effect of the machine tool 10 are related to the machining method performed using the machine tool 10. explain.

  When processing the workpiece 16, first, the workpiece 16 is arranged at a predetermined position of the workpiece holding board 18 by an operator or a robot, and the clamp claws 74a and 74b are closed. As a result, the workpiece 16 is held on the workpiece holding board 18.

  Next, the machining motor is energized, and thereby the rotation shaft of the machining motor is energized. The rotational driving force of the rotating shaft is transmitted to each tool 12 through the gear train and the spindle 30, and as a result, all the tools 12 start rotating operation in synchronization.

  Next, the rods 26a to 26d are moved forward by energizing the displacement cylinder, thereby moving the head support plate 24 forward toward the work holding plate 18 side. At this time, the head support plate 24 is guided by the rails 22 a and 22 b on the guide table 20, and the multi-axis head 14 is displaced integrally with the head support plate 24 and approaches the work holding plate 18.

  During this displacement, the tips of the guide bars 46 a and 46 b provided on the multi-axis head 14 enter and engage with guide bushes 52 a and 52 b provided on the work holding plate 18. Thereby, it is avoided that the multi-axis head 14 is displaced with respect to the work holding plate 18 and the tool 12 is displaced with respect to the work 16. Then, as shown in FIG. 5A, the tool 12 (thread cutting tool) comes close to the workpiece 16.

  When the multi-axis head 14 is further advanced, as shown in FIG. 5B, drilling proceeds by the drill blade 36 of the tool 12, and as a result, a pilot hole 80 is formed. At this time, since the multi-axis head 14 only advances in the horizontal direction, so-called plunging is performed. When the multi-axis head 14 reaches a predetermined position, the rods 26a to 26d (see FIG. 1) stop as the displacement cylinder is de-energized. Accordingly, a pilot hole 80 having a predetermined depth is obtained.

  At the same time, the chamfered portion forming portion 31 of the tool 12 is ground so that the vicinity of the opening of the pilot hole 80 is expanded in a tapered shape. Thereby, the chamfer 82 is formed.

  In this state, the contouring motors 62a and 62b are energized. As a result, the rotation shafts 66a and 66b of the contouring motors 62a and 62b and the first pulleys 68a and 68b start rotating, and the timing belts 72a and 72b start rotating. As a result, the second pulleys 70a and 70b around which the timing belts 72a and 72b are wound start to rotate.

  Following this, the eccentric spindles 50a and 50b rotate. As schematically shown in FIG. 6, since the centers of the insertion holes 58 of the eccentric spindles 50a and 50b are offset from the centers of the insertion holes 48a and 48b into which the eccentric spindles 50a and 50b are inserted, The guide bushes 52a and 52b fitted with the eccentric spindles 50a and 50b are rotated in an eccentric state with respect to the centers of the insertion holes 48a and 48b.

  As the guide bushes 52a and 52b rotate in this way, the guide bars 46a and 46b engaged with the guide bushes 52a and 52b follow and are displaced so as to draw a circular locus. Accordingly, the multi-axis head 14 provided with the guide bars 46a and 46b is also displaced so as to draw a circular locus. That is, the multi-axis head 14 performs a revolving motion.

  At this time, the coil spring 28 connecting the multi-axis head 14 and the head support plate 24 undergoes elastic deformation, and a part of the coil spring revolves around the center of the coil spring 28 as a rotation center. For this reason, the multi-axis head 14 can revolve without being constrained by the head support plate 24.

  When the multi-axis head 14 performs the revolving motion in this manner, the tool 12 performs the revolving motion in addition to the rotational motion. As a result, the tool 12 performs a contouring operation as shown in FIG. 5C. As a result, the thread cutting blade 38 starts threading the side wall of the prepared hole 80. Further, the chamfered portion 82 is expanded in diameter by the chamfered portion forming portion 31.

  Next, the displacement cylinder is re-biased and the rods 26a to 26d move backward. As a result, the head support plate 24 and the multi-axis head 14 are moved backward so as to be separated from the work holding plate 18. Of course, at this time, the head support plate 24 is guided to the rails 22a and 22b on the guide table 20, and the guide bars 46a and 46b are guided to the guide bushes 52a and 52b.

  As the head support plate 24 retreats in this manner, the tool 12 retreats in the direction of separating from the pilot hole 80 while continuing the contouring operation as shown in FIGS. 7A and 7B. At this time, the screw portion 84 is continuously engraved on the side wall of the prepared hole 80. That is, tapping is performed. Finally, when the tool 12 reaches the opening of the pilot hole 80, a screw hole 86 having a large diameter with respect to the pilot hole 80 and having the chamfered portion 82 formed therein is obtained.

  Thereafter, when the rods 26a to 26d are further retracted, the tool 12 is detached from the screw hole 86, and all processing is completed. Further, the guide bars 46a and 46b are detached from the guide bushes 52a and 52b. Thereafter, when the clamp claws 74a and 74b are opened, the workpiece 16 is released.

  As described above, according to the present embodiment, it is possible to perform a contouring operation on the multi-axis head 14 with a simple configuration in which the motors 62a and 62b and the eccentric spindles 50a and 50b are provided. . In other words, the tool 12 provided on the multi-axis head 14 can be subjected to a contouring operation with a simple configuration, that is, a contouring process can be performed.

  For this reason, since the pilot hole forming process, the tapping process, and the chamfering process can all be performed by one type of tool 12, it is not necessary to prepare many types and many tools. Further, the multi-axis head 14 may be prepared with a tool 12 provided with a drill 1 (see FIG. 8), a threaded tap 4 and a chamfer 7 attached. Need not be prepared separately. For these reasons, capital investment is reduced.

  In addition, according to the present embodiment, it is not necessary to replace the multi-axis head 14, and accordingly, the cycle time from the start to the end of the screw hole forming process can be shortened as compared with the prior art. Is possible. For this reason, the screw hole 86 can be formed efficiently.

  Furthermore, it is also possible to form screw holes having different diameters by exchanging the eccentric spindles 50a and 50b with those having different eccentric amounts and fitting them to the guide bushes 52a and 52b.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  For example, the guide bushes 52 a and 52 b may be provided on the multi-axis head 14, while the guide bars 46 a and 46 b may be provided on the work holding plate 18. Further, instead of displacing the multi-axis head 14 so as to approach or separate from the work holding plate 18, the work holding plate 18 is displaced so as to approach or separate from the multi-axis head 14. Also good.

  The processing method according to the present invention is not particularly limited to the case where the screw hole 86 is formed, and can be applied to the case where it is necessary to perform contouring processing. If necessary, only the contouring process may be performed from the beginning without performing the plunging process. In this case, the multi-axis head 14 may be subjected to a contouring operation as described above both when the multi-axis head 14 is relatively moved toward and away from the work holding plate 18.

  Furthermore, the machine tool 10 according to the present invention has a configuration in which the multi-axis head 14 can perform a contouring operation. However, when there is no need to perform the contouring process, the contouring motors 62a and 62b are provided. It is only necessary to maintain the stopped state so that the multi-axis head 14 does not perform the contouring operation. That is, only the plunging process may be performed by the machine tool 10. For example, it is possible to perform drilling by selecting a drill or reamer instead of the above-described thread cutting tool and performing plunging.

  Furthermore, it goes without saying that the workpiece 16 is not limited to a cylinder block, a cylinder head, or a mission case.

DESCRIPTION OF SYMBOLS 1 ... Drill 2, 16 ... Work 3, 80 ... Pilot hole 4 ... Screw cutting tap 5, 84 ... Screw part 6, 86 ... Screw hole 7 ... Chamfering tool 8, 82 ... Chamfering part 10 ... Machine tool 12 ... Tool 14 ... Multi-axis head 18 Workpiece holding plate 24 Head support plate 26a to 26d Rod 28 Coil springs 46a and 46b Guide bars 50a and 50b Eccentric spindles 52a and 52b Guide bushes 62a and 62b Contouring motor 68a 68b ... 1st pulley 70a, 70b ... 2nd pulley 72a, 72b ... Timing belt 74a, 74b ... Clamp claw

Claims (7)

A machine tool comprising a multi-axis head provided with a tool, and a work holding plate for holding a work to be processed by the tool,
A support that supports the multi-axis head via an elastic member that is elastically deformable in the direction of the contouring operation ;
A first guide engaging member provided on the multi-axis head;
A second guide engaging member that is provided on the work holding plate and engages with the first guide engaging member when the multi-axis head approaches the work holding plate relatively;
An eccentric spindle externally fitted to the second guide engaging member;
Said By rotating the eccentric spindle, the second guide engaging member can Rukoto to perform the contouring operation is rotated at an eccentric state the polyaxial head a rotary drive means,
A machine tool characterized by comprising: 2. The machine tool according to claim 1, wherein when the multi-axis head is relatively separated from the work holding plate, the first guide engaging member is engaged with the second guide engaging member. while you are, the said second guiding engagement member that is driven to a rotary drive means to follow the rotating while eccentric polyaxial head by performing a contouring operation, relative to the workpiece Machine tools characterized by contouring.   3. The machine tool according to claim 2, wherein when the multi-axis head approaches relatively to the work holding plate, the first guide engaging member and the second guide engaging member engage with each other. A machine tool characterized by performing plunging on the workpiece.   4. The machine tool according to claim 3, wherein when the multi-axis head approaches relatively to the work holding plate, a pilot hole is formed in the work, while the multi-axis head is formed on the work holding plate. A machine tool, wherein a screw portion is screwed into the prepared hole formed in the workpiece when the workpieces are relatively separated from each other. A machine tool that performs processing on a work held on a work holding plate by a tool provided on a multi-axis head supported by a support through an elastic member that can be elastically deformed in the direction of contouring operation. The processing method used,
When the multi-axis head relatively approaches the work holding plate, a first guide engaging member provided on the multi-axis head and an eccentric spindle provided on the work holding plate are externally fitted. Engaging the second guide engaging members with each other and applying a first machining to the workpiece with the tool;
When said multi-axis head is relatively away from the said work holding plate, while the first guide engaging member relative to said second guide engagement member is engaged, the rotational drive means By rotating the eccentric spindle by driving , the second guide engaging member is rotated in an eccentric state to cause the multi-axis head to perform a contouring operation. A process of contouring that is a process of
A processing method using a machine tool characterized by comprising:   6. The machining method according to claim 5, wherein the first guide engaging member and the second guide engaging member are engaged with each other when the multi-axis head approaches relatively to the work holding plate. And a plunging process as the first process. A processing method using a machine tool.   The machining method according to claim 6, wherein when the multi-axis head approaches relatively to the work holding plate, a pilot hole is formed in the work by the plunging process, while the multi-axis head is A machining method using a machine tool, wherein a screw portion is screwed into the prepared hole by the contouring process when the workpiece holding plate is separated from the workpiece holding plate.

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