JP2006116651A - Horizontal machining center and control method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a horizontal machining center having rigidity enough to thoroughly withstand machining reaction force even in the case where a spindle for machining a workpiece is horizontally projected from the body part. <P>SOLUTION: The horizontal machining center 1 taking three axes: X-axis, Y-axis and Z-axis orthogonal to one another as a control axis is a quill type horizontal machining center, which includes: a spindle 2, a body part 4 and a linear guide composed of a guide rail 27 for Z-axis feed and a guide block 33 for Z-axis, wherein in machining a workpiece, the spindle 2 is projected from the body part 4 in the direction of the Z-axis. The horizontal machining center 1 includes a support member 26 for supporting the spindle 2 in machining the workpiece together with the linear guide. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a horizontal machining center in which a spindle for processing a workpiece moves in a horizontal direction and a control method therefor.

  A horizontal machining center in which a spindle for processing a workpiece moves in a horizontal direction includes an X axis and a Z axis that are orthogonal to each other in the horizontal direction, and a vertical Y axis that is orthogonal to the X axis and the Z axis. A structure having a main body for holding a spindle that moves in the Z-axis direction is known.

  In this type of horizontal machining center, the spindle is stopped and processing is performed for the workpiece for reasons such as reducing the size of the apparatus and facilitating the setting of the jig for the workpiece. The spindle is housed inside the main body when waiting for machining, and a part of the spindle housed inside the main body protrudes in the Z-axis direction from the main body when machining the workpiece. A so-called quill type horizontal machining center is used (see, for example, Patent Document 1).

  A horizontal machining center described in Patent Document 1 includes a spindle (spindle head) that moves in the Z-axis direction to process a workpiece, and a head (Y-axis saddle) that holds the spindle and moves in the Y-axis direction. And a main body (X-axis saddle) that holds the spindle and the head and moves in the X-axis direction. That is, the X-axis direction is configured such that the main body moves while holding the head and the spindle, and the Y-axis direction is set such that the head moves relative to the main body while holding the spindle. The spindle is configured to move with respect to the main body and the head in the Z-axis direction.

  The linear drive mechanism (Z-axis feed mechanism) that linearly drives the spindle in the Z-axis direction includes a linear guide that guides the spindle in the Z-axis direction, a ball screw that is fixed to the head and feeds the spindle in the Z-axis direction, and a ball screw. And a servo motor that rotates. The linear guide includes a guide rail fixed to the spindle and a guide block fixed to the head and slidably fitted with the guide rail. The linear drive mechanism including these linear guide, ball screw, and servo motor is disposed below the spindle.

  In this horizontal machining center, in a state of waiting for processing, a part of the spindle is accommodated in the head and the main body. When machining the workpiece, the spindle linearly driven by the linear drive mechanism is guided in the Z-axis direction by the linear guide and protrudes from the head and the main body portion in the Z-axis direction. That is, the workpiece is processed in a state in which the storage portion of the spindle housed in the main body portion protrudes from the main body portion in the Z-axis direction.

  In addition, this horizontal machining center is configured to support a machining reaction force generated on the spindle during machining of a workpiece by a linear guide including a guide rail and a guide block.

Japanese Patent Laid-Open No. 2000-5960 (refer to the embodiment and drawings)

  In the horizontal machining center described in Patent Document 1, the workpiece is processed with the spindle protruding from the main body in the Z-axis direction. Further, the machining reaction force generated in the spindle is supported only by the linear guide. In other words, the machining reaction force generated in the spindle is supported only by the spindle holding portion of the linear guide, which is a sliding portion between the guide block fixed to the head and the guide rail fixed to the spindle.

  In this configuration, when the spindle protrudes from the main body, the distance between the tip of the spindle and the spindle holder increases, so that the spindle is held based on the reaction force generated in the spindle that processes the workpiece. The moment applied to the part increases. The magnitude of this moment is proportional to the amount of protrusion of the spindle relative to the main body, and depending on the amount of protrusion of the spindle, the machining reaction force cannot be sufficiently supported by the spindle holding portion of the linear guide. That is, there is a problem that the rigidity of the apparatus is lowered and the workpiece cannot be accurately processed.

  Accordingly, an object of the present invention is to provide a horizontal machining center having rigidity that can sufficiently withstand a reaction force even when a spindle for processing a workpiece protrudes in a horizontal direction from the main body. is there.

  In order to solve the above problems, the present invention uses three axes, that is, an X axis and a Z axis that are orthogonal to each other in the horizontal direction, and a Y axis that is orthogonal to the X axis and the Z axis as control axes. A spindle that performs machining, a main body that holds the spindle, and a linear drive mechanism that linearly drives the spindle in the Z-axis direction. The linear drive mechanism guides the spindle in the Z-axis direction and processes the workpiece. Sometimes a linear guide that supports the spindle is provided, and when the workpiece is waiting to be processed, at least a part of the spindle is housed inside the main body, and when processing the workpiece, the main body is in a waiting state for processing. In a horizontal machining center in which at least a part of the storage part of the spindle housed inside protrudes from the main body in the Z-axis direction, in addition to the linear guide, there are few Even when machining of the workpiece, characterized in that it comprises a supporting member for supporting with respect to the direction substantially perpendicular to the Z-axis direction of the spindle.

  In the present invention, the horizontal machining center is provided with a support member that supports the spindle in a direction substantially orthogonal to the Z-axis direction when processing a workpiece in addition to the linear guide. Therefore, the machining reaction force generated in the spindle when machining the workpiece with the housing portion of the spindle housed inside the body portion waiting for machining protrudes from the body portion in the Z-axis direction, and the linear guide and the support member. And can be received by both. Therefore, even when the spindle protrudes from the main body portion in the horizontal direction, the horizontal machining center can be provided with a rigidity that can sufficiently withstand the reaction force generated on the spindle.

  Here, in this specification, the “waiting state for the workpiece” means a state in which the spindle is stopped in the Z-axis direction and is waiting to perform processing on the workpiece. To do.

  In the present invention, the horizontal machining center includes a head that moves in the Y-axis direction while being guided by two parallel Y-axis feed guide rails that extend in the Y-axis direction while holding the spindle. And the spindle are held by two parallel X-axis feed guide rails extending in the X-axis direction and moved in the X-axis direction. With this configuration, since any of the three-axis drive mechanisms can be provided on the main body side, wiring can be easily routed and the apparatus can be simplified.

  In the present invention, the support member preferably includes a contact surface that contacts the spindle, and the contact surface is formed of resin. With this configuration, even if the support member for supporting the spindle is provided, the frictional resistance generated between the spindle and the support member when the spindle is linearly driven in the Z-axis direction can be reduced. Linear drive is smooth. In this case, the contact surface may be formed of, for example, ethylene-chlorotrifluoroethylene.

  In the present invention, the spindle is formed in a substantially cylindrical shape having an outer peripheral surface that contacts the contact surface, and the support member is formed in a substantially cylindrical shape having the contact surface as an inner peripheral surface. It is preferable that a spiral oil groove is formed. With this configuration, the lubricating oil can be supplied to the oil groove formed on the contact surface, and the frictional resistance generated between the spindle and the support member when the spindle is linearly driven in the Z-axis direction is further reduced. Can be reduced.

  In the present invention, it is preferable that the support member is disposed so as to be positioned closer to the workpiece than the position where the linear guide is disposed. With this configuration, the distance between the tip of the spindle that processes the workpiece and the support member can be made smaller than the distance between the tip of the spindle and the linear guide. This reduces the moment applied to the support member. Therefore, it is possible to sufficiently withstand the reaction force generated in the spindle.

  In the present invention, the linear drive mechanism is preferably disposed on the upper side of the spindle. Here, when the linear drive mechanism is disposed on the lower side of the spindle as in the horizontal machining center described in Patent Document 1, the position of the spindle for processing the workpiece is equivalent to the linear drive mechanism. Get higher. For example, the center position of the spindle is 150 cm from the installation surface of the apparatus, which is close to the height of the operator's line of sight, making it difficult to perform work such as workpiece setting. In addition, when a component provided above the linear drive mechanism, for example, a machining motor that rotationally drives a predetermined tool attached to the spindle, is removed from the main body during maintenance, the machining motor is temporarily used. Since it is necessary to lift etc. to the upper side, the operation | work at the time of a maintenance becomes complicated. However, if the linear drive mechanism is arranged on the upper side of the spindle, the position of the spindle can be lowered, and the work for setting the workpiece becomes easy. Also, during maintenance, the linear drive mechanism is arranged on the upper side, so that it is possible to remove it from the main unit without lifting the components such as the machining motor arranged on the lower side of the linear drive mechanism. Can be lowered to the surface. Therefore, the work at the time of maintenance becomes easy.

  In the present invention, the support member is loaded when the spindle is linearly driven while machining the workpiece, and when the spindle is linearly driven without machining the workpiece. In either case, the spindle is supported and the feed speed in the Z-axis direction of the spindle when loaded is configured to be slower than the feed speed in the Z-axis direction of the spindle when no load is applied. Is preferred. If comprised in this way, the lifetime of a support member provided with the contact surface formed with resin can be extended, shortening the processing time of a to-be-processed object. That is, the life of the support member is determined by the PV value which is the product of the surface pressure P applied to the contact surface of the support member and the spindle feed speed V. The smaller the PV value, the longer the life of the support member. It will be. Therefore, when the surface pressure P is large, the feed speed V is decreased to reduce the PV value, thereby extending the life of the support member. On the other hand, when the surface pressure P is small, the feed speed V is increased. By shortening the time and making the PV value at or below the PV value at the time of loading, the PV value can be reduced both when loaded and unloaded. Even a support member made of resin can extend its life. Further, by increasing the feed speed V at the time of no load as described above, the processing time from the setting of the workpiece to the completion of the processing can be shortened.

  Further, the present invention provides a spindle for processing a workpiece with three axes of an X axis and a Z axis orthogonal to each other in the horizontal direction and a Y axis orthogonal to the X axis and the Z axis, A main body unit that holds the spindle and a linear drive mechanism that linearly drives the spindle in the Z-axis direction. The linear drive mechanism guides the spindle in the Z-axis direction and supports the spindle when processing the workpiece. A guide is provided, and at least a part of the spindle is stored inside the main body in a state waiting for processing on the workpiece, and at the time of processing on the workpiece, it is stored inside the main body in a state waiting for processing. In a control method of a horizontal machining center in which at least a part of a spindle storage portion protrudes from a main body in the Z-axis direction, in addition to a linear guide, at least a workpiece And a support member that supports the spindle in a direction substantially perpendicular to the Z-axis direction, and the support member includes a contact surface formed of a resin that contacts the spindle, and the support member is further processed. The spindle is supported both when the spindle is linearly driven while machining the workpiece and when the spindle is linearly driven without machining the workpiece. The feed rate in the Z-axis direction of the spindle when loaded is slower than the feed rate in the Z-axis direction of the spindle when unloaded.

  The horizontal machining center according to the present invention is controlled such that the feed speed of the spindle in the Z-axis direction under load is slower than the feed speed of the spindle in the Z-axis direction during no load. Therefore, the PV value can be reduced both when the load is applied and when the load is not applied. As a result, the life of the support member can be extended even if the contact surface is formed of resin. Further, by increasing the feed speed when there is no load, it is possible to shorten the processing time from the setting of the workpiece to the completion of the processing.

  As described above, the horizontal machining center according to the present invention can be provided with a rigidity that can sufficiently withstand a reaction force even when a spindle for processing a workpiece projects from the main body portion in the horizontal direction.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

(Overall configuration of horizontal machining center)
FIG. 1 is a side view showing a horizontal machining center 1 according to an embodiment of the present invention. FIG. 2 is an explanatory side view showing the configuration of the horizontal machining center 1 shown in FIG. FIG. 3 is an explanatory front view of the horizontal machining center 1 shown in FIG. 1 as seen from the front in a partially transparent state. FIG. 4 is a top view illustrating the configuration of the horizontal machining center 1 shown in FIG. 2 to 4 are explanatory views for explaining the positional relationship of the constituent members of the horizontal machining center 1, and are not drawings showing a certain cross section.

  The horizontal machining center 1 of this embodiment has three control axes, that is, an X axis and a Z axis that are orthogonal to each other in the horizontal direction, and a vertical Y axis that is orthogonal to the X axis and the Z axis. A substantially cylindrical spindle 2 that moves and processes a workpiece (not shown), a quadrangular columnar head 3 that holds the spindle 2 and moves in the Y-axis direction, and holds the spindle 2 and the head 3. And a main body 4 that moves in the X-axis direction. That is, in the horizontal machining center 1 of the present embodiment, the main body 4 is configured to move while holding the head 3 and the spindle 2 in the X-axis direction, and the spindle 2 is held in the Y-axis direction. Thus, the head 3 is configured to move with respect to the main body 4, and the spindle 2 is configured to move with respect to the main body 4 and the head 3 in the Z-axis direction.

  That is, the horizontal machining center 1 according to this embodiment is configured such that a part of the spindle 2 is housed in the main body 4 in a state of waiting for processing a workpiece, and the body is in a state of waiting for processing when processing the workpiece. This is a so-called quill type horizontal machining center in which a part of the storage portion of the spindle 2 housed inside the portion 4 protrudes from the main body portion 4 in the Z-axis direction.

  In FIG. 1, the workpiece is held by a workpiece holding mechanism (not shown) spaced apart to the left of the main body 4 and is attached to the tip of the spindle 2 that moves in the Z-axis direction. Predetermined processing is performed by the attached tool. This workpiece holding mechanism constitutes a part of the horizontal machining center 1. In the description of the present embodiment, the horizontal direction (horizontal direction in FIG. 1) of the horizontal machining center 1 is the X-axis direction, the vertical direction (vertical direction in FIG. 1) is the Y-axis direction, and the front-back direction (horizontal direction in FIG. 1). Is the Z-axis direction, and in particular, the direction in which the spindle 2 moves away from the workpiece is the Z1 direction, and the direction in which the spindle 2 approaches the workpiece is the Z2 direction.

  The main body 4 is formed in a substantially rectangular tube shape that opens in the Z-axis direction, which is the moving direction of the spindle 2, and is configured to be movable in the X-axis direction with respect to the base 5.

  In order to guide the main body 4 in the X-axis direction, the base 5 is fed with two parallel long X-axis feed guide rails 6 extending in the X-axis direction and the main body 4 in the X-axis direction. Bearing holding members 9 and 10 for holding two cylindrical bearings 8 that rotatably support both end sides of one long X-axis ball screw 7 are fixed. One bearing holding member 10 is fixed with an X-axis feed motor 11 that rotationally drives the X-axis feed ball screw 7. The output shaft of the X-axis feed motor 11 is connected to one end of the X-axis feed ball screw 7 via a coupling 12.

  An X-axis feed guide block 13 that is slidably fitted to the X-axis feed guide rail 6 is fixed to the bottom surface of the main body 4. More specifically, four X-axis feed guide blocks 13 are fixed in the vicinity of the four corners of the bottom surface of the main body 4 (see FIG. 4). Two X-axis feed guide blocks 13 are slidable. The X-axis feed guide block 13 and the X-axis feed guide rail 6 guide the main body 4 in the X-axis direction.

  Further, a nut holding portion 14 holding an X-axis feed nut 22 screwed with the X-axis feed ball screw 7 is fixed at a substantially central position in the Z-axis direction on the bottom surface of the main body portion 4. The main body 4 is linearly driven in the X-axis direction by the X-axis feed ball screw 7, the X-axis feed nut 22, the X-axis feed guide block 13, the X-axis feed guide rail 6, the X-axis feed motor 11, and the like. An X-axis feed mechanism is configured.

  In order to guide the head 3 in the Y-axis direction, two parallel long Y-axis feed guide rails 15 extending in the Y-axis direction are fixed to the main body 4. More specifically, the two Y-axis feed guide rails 15 are fixed so as to sandwich the head 3 on the side surface in the Z2 direction of the main body 4 (the left side surface in FIG. 1). These Y-axis feed guide rails 15 are slidably fitted with later-described Y-axis feed guide blocks 25 fixed to the head 3.

  Further, two cylindrical bearings 17 that rotatably support both ends of one long Y-axis feed ball screw 16 that feeds the head 3 in the Y-axis direction are fixed to the main body 4. Yes. More specifically, one of the two bearings 17 is fixed to the upper end of the main body portion 4, and the other is fixed to the lower end side of the main body portion 4. A Y-axis feed nut 30, which will be described later, held by the head 3 is screwed onto the Y-axis feed ball screw 16.

  Further, a motor holding member 19 that holds a Y-axis feed motor 18 that rotationally drives the Y-axis feed ball screw 16 is fixed to the upper end of the main body 4. The motor holding member 19 is formed in a substantially cylindrical shape, and the output shaft of the Y-axis feed motor 18 is connected to one end of the Y-axis feed ball screw 16 via a coupling 20 on the inner peripheral side thereof. .

  In addition, two long balance cylinders 21 are attached to the main body 4 in parallel in order to reduce the driving load of the Y-axis feed motor 18 when the head 3 is driven upward. . More specifically, as shown in FIG. 2, the tip (lower end) of the long cylinder rod 21 a constituting the balance cylinder 21 is fixed to the lower end side of the main body 4, and the lower end of the cylinder main body 21 b connects the head 3. It is fixed to a later-described head main body member 23. In the balance cylinder 21, pressure is always applied so as to substantially balance the weight of the head 3 (that is, a force that urges the head 3 upward is applied), thereby driving the head 3 upward. The driving load of the Y-axis feed motor 18 at the time is reduced.

(Head and spindle configuration)
FIG. 5 is a side view illustrating the configuration of the head 3 and the spindle 2 shown in FIG. FIG. 6 is an explanatory front view of the head 3 and the spindle 2 shown in FIG. FIG. 7 is a top view illustrating the configuration of the head 3 and the spindle 2 shown in FIG. 8A and 8B are diagrams showing the head main body member 23 shown in FIG. 5, in which FIG. 8A is a front view, FIG. 8B is a side view, and FIG. 8C is a top view. 9A and 9B are diagrams showing the head top plate member 24 shown in FIG. 5, where FIG. 9A is a front view and FIG. 9B is a bottom view. 10A and 10B are diagrams showing the spindle holding member 32 shown in FIG. 5, where FIG. 10A is a front view and FIG. 10B is a side view. 5 to 7 are explanatory views for explaining the positional relationship between the constituent members of the head 3 and the spindle 2, and are not drawings showing a certain cross section.

  As shown in FIGS. 5 to 7, the quadrangular columnar head 3 includes a head main body member 23 and a head top plate member 24 as its skeleton, and is arranged so as to fit into the main body portion 4 opened in the Z-axis direction. It is installed. As described above, the head 3 allows movement of the spindle 2 in the Z-axis direction and is movable in the Y-axis direction with respect to the main body 4 while holding the spindle 2. The head body member 23 includes four Y-axis feed guide blocks 25 that are slidably fitted to the Y-axis feed guide rails 15 and a cylindrical shape that supports the spindle 2 and guides movement in the Z-axis direction. The support member 26 and the like are fixed. The head top plate member 24 has two long Z-axis feed guide rails 27 for guiding the spindle 2 in the Z-axis direction, and one long Z-axis feed for feeding the spindle 2 in the Z-axis direction. Two bearings 29 that rotatably support both ends of the ball screw 28 for rotation, a Z-axis feeding motor 31 that rotates the Z-axis feeding ball screw 28, and the like are fixed.

  The spindle 2 is configured to be movable in the Z-axis direction with respect to the head 3 together with the spindle holding member 32 that holds the spindle 2. The spindle holding member 32 includes four Z-axis feed guide blocks 33 that are slidably fitted to the Z-axis feed guide rail 27, a machining motor 35 that rotationally drives a machining shaft 34 that constitutes the spindle 2, and the like. Is fixed.

  Hereinafter, these configurations will be described in detail.

  As shown in FIG. 8, the head main body member 23 includes a substantially rectangular and thin plate-like bottom surface portion 23a, a thin plate-shaped front surface portion 23b that rises perpendicularly from the Z2 direction end of the bottom surface portion 23a, and a bottom surface portion 23a. It has two parallel thin plate-like side surface portions 23c that rise vertically and are orthogonal to the front surface portion 23b.

  The front surface portion 23b is symmetrical with respect to the center line of the front surface portion 23b in the X direction with respect to the guide block fixing portion 23b1 protruding outward in the X axis direction (both in the vertical direction in FIG. 8C) from the two side surface portions 23c. The Y-axis feed guide block 25 is fixed to the back surface of the guide block fixing portion 23b1. More specifically, as shown in FIGS. 6 and 7, four Y-axis feed guide blocks 25 are fixed to the guide block 25 in the vicinity of the four corners of the surface on the Z1 direction side of the substantially rectangular front surface portion 23b. The two Y-axis feed guide blocks 25 are slidable with respect to one Y-axis feed guide rail 15. The Y-axis feed guide block 25 and the Y-axis feed guide rail 15 guide the head 3 in the Y-axis direction.

  As shown in FIG. 8A, a circular through hole 23d is formed at a substantially central position of the front surface portion 23b, and a support member 26 is fixed to the through hole 23d. Here, as shown in FIG. 5, the front surface portion 23b is located at the end of the head 3 in the Z2 direction, that is, at the end of the spindle 2 in the projecting direction, so that the support member 26 fixed to the through hole 23d On the protruding side that protrudes, the head 3 is disposed. Further, the support member 26 is disposed so as to be located closer to the workpiece as compared to the position where a later-described linear guide composed of the Z-axis feed guide block 33 and the Z-axis feed guide rail 27 is disposed. Has been. The detailed configuration of the support member 26 will be described later.

  Above the through hole 23d, a recess 23b2 is formed which is a region recessed in the direction of the through hole 23d from the upper end surface of the front surface portion 23b. In the recess 23b2, two step surfaces 23b3 are formed symmetrically with respect to the center line in the X direction (left and right direction in FIG. 8A) of the front surface portion 23b.

  The upper end surfaces 23c1 of the two side surface portions 23c are formed to be flush with the step surface 23b3 of the front surface portion 23b, and the step surface 23b3 and the upper end surface 23c1 are mounted on which the head top plate member 24 is mounted. It is a surface. In addition, the two side surface portions 23c are provided with cylinder fixing portions 23e that protrude outward in the X-axis direction (both in the vertical direction in FIG. 8C) symmetrically with respect to the center line of the head body member 23 in the X direction. It has been. A balance cylinder 21 is fixed to each of the two cylinder fixing portions 23e. Further, on one side surface (the lower side in FIG. 8C), a circular through hole 23f formed on the bottom surface portion 23a and through which the Y-axis feed ball screw 16 is inserted is concentric with the through hole 23f. A curved portion 23c2 that is curved in a Y-axis direction and formed in the Y-axis direction is formed.

  As shown in FIG. 5, a bracket 37 is fixed to the end of the bottom surface portion 23a in the Z1 direction, and a position detection sensor 38 for detecting the position of the spindle 2 in the Z-axis direction is attached to the bracket 37. Yes.

  As shown in FIG. 9, the head top plate member 24 is a thick plate member, and a concave groove 24b extending in the Z-axis direction is formed at the center of the bottom surface 24a in the X direction. Ring-shaped bearing holding portions 24c and 24d that respectively hold the two bearings 29 are formed in the concave groove 24b so as to protrude toward the bottom surface 24a while being separated in the Z-axis direction. Here, the bearing holding portions 24c and 24d are formed in a cylindrical shape so as to surround the Z-axis feed ball screw 28 on the entire circumference, and in order to save space in the Y-axis direction, the lower ends thereof are flat portions 24e1 and 24e2. Has been.

  Further, as shown in FIG. 6, two Z-axis feed guide rails 27 are fixed in parallel to each other on the outer side in the X direction of the groove 24b on the bottom surface 24a. The Z-axis feed guide rail 27 and the head top plate member 24 have substantially the same length in the Z-axis direction. Furthermore, outside the Z-axis feed guide rail 27, the bottom surface 24a is mounted on the mounting surface of the head main body member 23 including the step surface 23b3 and the top surface 23c1. In the state where the head top plate member 24 is placed on the head main body member 23, as shown in FIG. 5, the front surface (surface on the Z2 direction side) of the front surface portion 23 b of the head main body member 23 and the head top plate member 24. The left end surface (surface on the Z2 direction side) in FIG. 9B is substantially the same surface, and the skeleton of the head 3 has a bar shape extending in the horizontal direction when viewed from the X direction.

  A cylindrical nut holding portion 24e protruding toward the upper surface side is formed on one end side in the X direction of the head top plate member 24 (upper end in FIG. 9B). A Y-axis feed nut 30 that is screwed onto the Y-axis feed ball screw 16 is held on the inner peripheral side of the nut holding portion 24e. The head 3 is linearly driven in the Y-axis direction by the Y-axis feed nut 30, the Y-axis feed ball screw 16, the Y-axis feed guide block 25, the Y-axis feed guide rail 15, the Y-axis feed motor 18, and the like. A Y-axis feed mechanism is configured. In a state where the head top plate member 24 is placed on the head main body member 23, the axial centers of the through holes 23f of the head main body member 23 and the nut holding portions 24e are substantially aligned.

  Further, as shown in FIGS. 5 and 7, a motor mounting plate 39 is fixed to the Z1 direction end of the head top plate member 24 (the right end in FIG. 9B). A shaft feed motor 31 is attached. The output shaft of the Z-axis feed motor 31 is connected to one end of the Z-axis feed ball screw 28 via a coupling 40.

  As shown in FIG. 5, a control box 41 for driving and controlling the Z-axis feed motor 31 and the processing motor 35 is fixed to the Z1 direction end of the upper surface of the head top plate member 24. At the side of the control box 41, a bracket 42 is fixed to the upper surface of the head top plate member 24, and one end of a cable bear 43 provided with wiring for driving and controlling the machining motor 35 on the bracket 42. Is fixed. The other end of the cable bear 43 is fixed to the spindle holding member 32.

  As shown in FIG. 10, the spindle holding member 32 is arranged in a state where the front surface portion 32 b in which the through hole 32 a is formed and the front surface portion 32 b are parallel to the front surface portion 32 b and separated from each other in the Z1 direction. Part 32c. A nut holding portion 32 e that holds a Z-axis feed nut 45 that is screwed onto the Z-axis feed ball screw 28 is provided on the upper surface 32 d of the spindle holding member 32.

  As shown in FIGS. 5 and 10, the spindle 2 is fixed to the front surface 32b1 (the surface on the Z2 direction side) of the front surface portion 32b. Further, a machining shaft 34 constituting the spindle 2 is inserted through the through hole 32a of the front surface portion 32b.

  A Z-axis feed guide block 33 is fixed to the upper surface 32d. More specifically, four Z-axis feed guide blocks 33 are fixed in the vicinity of the four corners of the substantially rectangular upper surface 32 d, and two Z-axes are provided for one Z-axis feed guide rail 27. The feed guide block 33 is slidable. The four Z-axis feed guide blocks 33 and the two Z-axis feed guide rails 27 constitute a linear guide that guides the spindle 2 in the Z-axis direction and supports the spindle 2 when processing the workpiece. Yes. Further, the spindle 2 is constituted by the Z-axis feed ball screw 28, the Z-axis feed nut 45, the Z-axis feed guide block 33, the Z-axis feed guide rail 27, the Z-axis feed motor 31, the bearing 29 and the coupling 40. A Z-axis feed mechanism is configured as a linear drive mechanism that linearly drives in the Z-axis direction. This Z-axis feed mechanism is arranged on the upper side of the spindle 2 as shown in FIG.

  The nut holding portion 32e is provided so as to protrude upward at a position slightly shifted in the Z2 direction from the center of the upper surface 32d. In a state in which the Z-axis feed nut 45 is screwed into the Z-axis feed ball screw 28, as shown in FIG. 5, the nut holding portion 32e and the bearing holding portion 24c of the head top plate member 24 are in the Z-axis direction. It is located between the holding portion 24d.

  A motor mounting plate 46 is fixed to the motor fixing portion 32c, and a processing motor 35 is mounted on the motor mounting plate 46. The output shaft of the processing motor 35 is connected to one end of the processing shaft 34 via a coupling 47.

  A linear scale 48 that detects the Z-direction position of the spindle 2 in cooperation with the position detection sensor 38 is fixed to the bottom surface of the spindle holding member 32 so as to face the position detection sensor 38.

  The spindle 2 includes a machining shaft 34 and a substantially cylindrical fixed-side member 49 (see FIG. 5) that rotatably holds the machining shaft 34 via a bearing (not shown) on the inner peripheral side. The whole 2 is formed in a substantially cylindrical shape.

  A predetermined tool is attached to the tip of the machining shaft 34 (the other end when the connection side of the coupling 47 is one end). The machining shaft 34 is rotationally driven by a machining motor 35 to perform a predetermined machining on the workpiece.

  The fixed side member 49 has a flange portion 49 a, and the flange portion 49 a is fixed to the front surface 32 b 1 of the spindle holding member 32. Further, the outer peripheral surface 49 b of the fixed side member 49 is supported by the support member 26.

  As shown in FIGS. 1 and 5, when the spindle 2 is located at the end in the Z1 direction (the right end in the figure), that is, the spindle 2 stops in the Z-axis direction and waits for processing on the workpiece. The left end of the spindle 2 in FIG. 5 is supported by the support member 26 when it is in the processing waiting state. At this time, most of the spindle 2 is accommodated in the head 3 and the main body 4. Further, when processing the workpiece, the spindle 2 moves in the Z2 direction with respect to the head 3 and the main body 4 while being supported by the support member 26, and protrudes from the head 3 and the main body 4. Yes. Thus, in this embodiment, the spindle 2 is always supported by the support member 26. Further, the Z-axis feed guide block 33 is positioned inside the head 3 even during processing of the workpiece.

(Configuration of support member)
FIG. 11 is a cross-sectional view showing the support member 26 shown in FIG. FIG. 12 is an enlarged view showing an F portion of the support member 26 shown in FIG.

  As shown in FIG. 11, the support member 26 includes a substantially cylindrical metallic base portion 51 and a resin layer 52 formed along the inner peripheral surface of the base portion 51, and has a substantially cylindrical shape as a whole. Is formed.

  More specifically, the support member 26 is formed in a stepped cylindrical shape. That is, the outer peripheral surface of the base portion 51 includes a first circular outer peripheral surface 51a, a second circular outer peripheral surface 51b having a larger diameter than the first circular outer peripheral surface 51a, and a third circle having a larger diameter than the second circular outer peripheral surface 51b. An outer peripheral surface 51c and a fourth circular outer peripheral surface 51d having a diameter larger than that of the first circular outer peripheral surface 51a and smaller than that of the second circular outer peripheral surface 51b are provided, and the first circular outer peripheral surface 51a and the second circular outer peripheral surface are provided. The surface 51b, the third circular outer peripheral surface 51c, and the fourth circular outer peripheral surface 51d are arranged in this order in the Z-axis direction (Z2 direction). An annular step surface 51g formed between the second circular outer peripheral surface 51b and the third circular outer peripheral surface 51c abuts on the front surface (surface on the Z2 direction side) of the front surface portion 23b of the head body member 23. The support member 26 is in a state where the step surface 51g is in contact with the front surface of the front surface portion 23b and the second circular outer peripheral surface 51b is fitted in the through hole 23d of the head main body member 23. The head body member 23 is fixed.

  The base portion 51 has two oil supply holes, an oil supply hole 51e penetrating from the first circular outer peripheral surface 51a to the inner peripheral surface and an oil supply hole 51f penetrating from the third circular outer peripheral surface 51c to the inner peripheral surface. Yes.

  The resin layer 52 is formed in a thin cylindrical shape along the inner peripheral surface of the base portion 51, and the thickness thereof is, for example, 1.5 mm. The resin layer 52 is formed of, for example, a resin having lubricity. In this embodiment, the resin layer 52 is formed of ethylene-chlorotrifluoroethylene. The resin used for the resin layer 52 is not limited to ethylene-chlorotrifluoroethylene, and various resins can be used. However, it is possible to use a resin having lubricity to support the spindle 2. This is preferable in reducing friction generated between the member 26 and the member 26. For example, a two-component epoxy resin-based synthetic resin can be used.

  The surface of the resin layer 52, that is, the inner peripheral surface of the support member 26 is an outer peripheral surface 49 b of the fixed side member 49 constituting the spindle 2, that is, a contact surface 26 a that contacts the outer peripheral surface of the spindle 2. A slight clearance is provided between the contact surface 26a and the outer peripheral surface 49a. In this embodiment, a clearance of about 0.02 mm is provided in terms of a diameter difference.

  As shown in FIG. 12, a spiral oil groove 26a1 is formed on the contact surface 26a. The two oil supply holes 51e and 51f described above both penetrate the resin layer 52, and the lubricating oil is supplied to the oil groove 26a1 through the oil supply holes 51e and 51f.

  In this embodiment, the resin layer 52 is formed by injecting liquid ethylene-chlorotrifluoroethylene into the inner peripheral surface of the base portion 51 and then curing the liquid ethylene-chlorotrifluoroethylene. The The oil groove 26a1 is processed after the liquid ethylene-chlorotrifluoroethylene is cured. Note that the resin layer 52 can also be formed by injecting the above two-component epoxy resin-based synthetic resin into a liquid state and injecting it into the inner peripheral surface of the base portion 51 and then curing it.

(Operation of horizontal machining center)
In the horizontal machining center 1 configured as described above, the workpiece is processed as follows.

  First, in FIG. 1, the workpiece is held by a workpiece holding mechanism (not shown) that is spaced apart to the left of the main body 4. At this time, as shown in FIG. 5, the spindle 2 is in a state of waiting for processing located at the end in the Z1 direction with respect to the head 3, and the workpiece and the tip of the spindle 2 are separated in the Z-axis direction. It is in. At this time, most of the spindle 2 is accommodated in the head 3 and the main body 4.

  In this state, the workpiece 2 is positioned in the X-axis direction and the Y-axis direction of the spindle 2. More specifically, the X-axis feed mechanism constituted by the X-axis feed ball screw 7 or the like moves the main body 4 while holding the head 3 and the spindle 2 in the X-axis direction with respect to the workpiece. Positioning is done. Further, the Y-axis feed mechanism constituted by the Y-axis feed ball screw 16 and the like moves the head 3 with respect to the main body 4 while holding the spindle 2 to position the workpiece in the Y-axis direction. .

  Thereafter, as shown in FIG. 13, the spindle 2 moves in the Z-axis direction toward the workpiece together with the spindle holding member 32 by the Z-axis feed mechanism and protrudes from the head 3 and the main body 4. That is, the spindle 2 protrudes from the support member 26 while being supported by the support member 26. More specifically, the spindle holding member 32 holding the Z-axis feed nut 45 is linearly driven in the Z-axis direction (Z2 direction) by the Z-axis feed ball screw 28 rotated by the Z-axis feed motor 31. The At that time, the spindle holding member 32 and the spindle 2 are guided in the Z-axis direction (Z2 direction) by the linear guide constituted by the Z-axis feed guide block 33 and the Z-axis feed guide rail 27. In this embodiment, since the spindle 2 is always supported by the support member 26, the spindle 2 is also guided by the support member 26 in the Z-axis direction.

  When the spindle 2 moves in the Z-axis direction (Z2 direction) by a predetermined distance, the tool attached to the tip of the spindle 2 comes into contact with the workpiece, and the workpiece is processed. Processing on the workpiece is performed by further moving the spindle 2 in the Z-axis direction while rotating the processing shaft 34 by the processing motor 35. Further, the workpiece is processed while the position of the spindle 2 in the X-axis direction or the Y-axis direction is changed by the X-axis feed mechanism or the Y-axis feed mechanism. When machining a workpiece, the machining reaction force generated on the spindle 2 is supported by a linear guide and support member 26 constituted by a Z-axis feed guide block 33 and an X-axis feed guide rail 27. The direction of the machining reaction force generated on the spindle 2 varies depending on the machining state of the workpiece. In accordance with the change in the processing direction, the support member 26 supports the spindle 2 in a direction substantially orthogonal to the Z-axis direction. Since the distance from the tip of the spindle 2 to the support member 26 is shorter than the distance from the tip of the spindle 2 to the linear guide portion, that is, the Z-axis feed guide block 33, the reaction force generated in the spindle 2 is reduced. Accordingly, the moment applied to the support member 26 is smaller than the moment applied to the linear guide.

  Here, in this embodiment, as described above, the support member 26 is configured to support the spindle 2 at all times. That is, the support member 26 is configured so that the spindle 2 is in the Z-axis direction when the spindle 2 is linearly driven in the Z-axis direction while machining the workpiece, and the workpiece 2 is not machined. The spindle 2 is supported both in the case of no load that is linearly driven.

In this embodiment, the feed speed V in the Z-axis direction of the spindle 2 at the time of load is controlled to be slower than the feed speed V in the Z-axis direction of the spindle 2 at the time of no load. That is, the spindle 2 is fed in the Z-axis direction at a high speed until the tool attached to the tip of the spindle 2 comes into contact with the workpiece. The feed speed V is, for example, 50 m / min. When the tool attached to the tip of the spindle 2 is in contact with the workpiece and the machining is performed, the spindle 2 is fed at a low speed in the Z-axis direction. Alternatively, the spindle 2 is fed in the Z-axis direction at a low speed while changing the position of the spindle 2 in the X-axis direction or the Y-axis direction. The feed speed V is, for example, 1 m / min. Since the clearance is provided between the abutment surface 26a of the support member 26 and the outer peripheral surface 49b of the spindle 2, as described above, the self-weight of the spindle 2 is Z-axis fed during no load. The surface pressure P applied to the contact surface 26a of the support member 26 is almost negligible. Further, the surface pressure P applied to the contact surface 26a of the support member 26 at the time of load is, for example, 3 kg / cm ² .

  The feed speed V of the spindle 2 in the Z-axis direction is controlled as follows. That is, the coordinate position in the Z direction where the spindle 2 contacts the workpiece is calculated and set in advance. Until the set coordinate position is reached, the spindle 2 is fed in the Z-axis direction at a high speed. When the set coordinate position is reached, that is, when the spindle 2 comes into contact with the workpiece, the spindle 2 is fed in the Z-axis direction at a low speed. The detection of the coordinate position in the Z-axis direction is performed by the position detection sensor 38 and the linear scale 48. The calculated coordinate position is set on a program for controlling the movement of the spindle 2.

  When the processing on the workpiece is completed, the spindle 2 is moved to the end in the Z1 direction by the Z-axis feed mechanism and enters a state of waiting for processing. Further, the head 3 is moved to a predetermined standby position while the spindle 2 is held by the Y-axis feed mechanism, and the main body 4 is moved to a predetermined position while the head 3 and the spindle 2 are held by the X-axis feed mechanism. Move up.

(Main effects of this form)
As described above, the horizontal machining center 1 according to the present embodiment is configured so that the spindle 2 is moved to the Z axis when machining a workpiece in addition to the linear guide composed of the Z-axis feed guide block 33 and the Z-axis feed guide rail 27. A support member 26 is provided for supporting in a direction substantially orthogonal to the axial direction. For this reason, the machining reaction force generated in the spindle 2 is linearly generated when the portion of the spindle 2 accommodated inside the main body 4 waiting for machining projects from the main body 4 in the Z-axis direction to machine the workpiece. It can be received by both the guide and the support member 26. Therefore, even in the case of the quill type horizontal machining center 1 configured to process a workpiece while the spindle 2 protrudes from the main body 4 in the Z-axis direction, the processing reaction force generated in the spindle 2 is sufficient. It is possible to provide rigidity that can withstand.

  In this embodiment, the support member 26 has a contact surface 26 a that contacts the spindle 2 made of resin. Therefore, even when the support member 26 supporting the spindle 2 is added as a configuration, the frictional resistance generated between the spindle 2 and the support member 26 when the spindle 2 is linearly driven in the Z-axis direction is reduced. As a result, the linear drive of the spindle 2 becomes smooth.

  In particular, in this embodiment, the contact surface 26a is formed of ethylene-chlorotrifluoroethylene which is a lubricious resin. Therefore, the frictional resistance generated between the spindle 2 and the support member 26 can be further reduced. Further, since ethylene-chlorotrifluoroethylene hardly undergoes thermal expansion, an increase in frictional resistance generated between the spindle 2 and the support member 26 due to an increase in ambient temperature can be almost ignored. Even when the contact surface 26a is formed using a two-component epoxy resin-based synthetic resin, the same effect as that obtained by using ethylene-chlorotrifluoroethylene can be obtained.

  In this embodiment, a spiral oil groove 26a1 is formed on the contact surface 26a of the support member 26, and lubricating oil is supplied to the oil groove 26a1 through the oil supply holes 51e and 51f. . Therefore, the frictional resistance generated between the spindle 2 and the support member 26 when the spindle 2 is linearly driven in the Z-axis direction can be further reduced by the lubricating oil supplied to the oil groove 26a1.

  In this embodiment, the support member 26 is disposed on the protruding side where the spindle 2 protrudes from the head 3 and the main body 4. Therefore, the distance between the tip of the spindle 2 that processes the workpiece and the support member 26 can be reduced, and the moment applied to the support member 26 based on the processing reaction force generated on the spindle 2 is reduced. Therefore, it is possible to sufficiently withstand the reaction force generated in the spindle 2.

  In this embodiment, it is constituted by a Z-axis feed ball screw 28, a Z-axis feed nut 45, a Z-axis feed guide block 33, a Z-axis feed guide rail 27, a Z-axis feed motor 31, a bearing 29, and a coupling 40. A linear drive mechanism (Z-axis feed mechanism) is disposed above the spindle 2. Therefore, the position of the spindle 2 for processing the workpiece can be lowered by the space of the linear drive mechanism as compared with the case where the linear drive mechanism is disposed below the spindle. In other words, the handling position of the workpiece can be lowered by the space of the linear drive mechanism. For example, the center position of the spindle 2 can be set to about 100 cm from the installation surface of the apparatus, and as a result, work such as setting of the workpiece is facilitated. Further, when removing the machining motor 35 from the head 3 during maintenance, since there is no linear drive mechanism on the lower side, the machining motor 35 can be removed and lowered directly onto the floor surface. Therefore, it becomes easy to remove the machining motor 35 during maintenance.

  In this embodiment, the support member 26 is not loaded when the spindle 2 is linearly driven in a state where the spindle 2 is linearly driven while processing the workpiece, and when the workpiece 2 is not processed. The spindle 2 is configured to be supported both when loaded. Further, the feed speed V in the Z-axis direction of the spindle 2 under load is controlled to be slower than the feed speed V in the Z-axis direction of the spindle 2 under no load. Therefore, the processing time of the workpiece can be shortened. Moreover, since the feeding speed at the time of load is made slow, the lifetime of the support member 26 provided with the contact surface 26a formed with resin can be extended.

  That is, when the surface pressure P applied to the contact surface of the support member 26 is a large load, the feed speed V of the spindle 2 is slowed down, and when the surface pressure P is small, the feed speed V is increased so as to be loaded and unloaded. In any case, the PV value that is the product of the surface pressure P and the feed speed V that determines the life of the support member 26 can be reduced. Therefore, even if the contact surface 26a that contacts the outer peripheral surface of the spindle 2 is the support member 26 formed of resin, the life of the support member 26 can be extended. Further, by increasing the feed speed V when there is no load, the processing time from the setting of the workpiece to the completion of the processing can be shortened.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited thereto, and various modifications can be made without departing from the scope of the present invention. For example, in the above-described embodiment, the horizontal machining center 1 includes a quill type horizontal machining center, that is, the head 3 that holds the spindle 2 and moves in the Y-axis direction, and the main body 4 holds the head 3 and the spindle 2. However, the present invention is not limited to this configuration. For example, the head 3 may not be provided, and the spindle 2 may be configured to be directly held by the main body unit 4 and the workpiece holding mechanism that holds the workpiece may be configured to move in the Y-axis direction. Thus, the present invention can be applied to a horizontal machining center other than the quill type.

  Alternatively, the main body 4 may be fixed to the base 5 so that the workpiece holding mechanism moves in the X-axis direction. Furthermore, the head 3 may not be provided, and the spindle 2 may be configured to be directly held by the main body 4 and the main body 4 may be fixed to the base 5. In this case, the workpiece holding mechanism may be configured to move in the X-axis direction and the Y-axis direction. Further, in the above-described embodiment, the movement in the Z-axis direction is performed only by the spindle 2, but the main body 4 is partially moved in the Z-axis direction, and the movement in the Z-axis direction is changed to the main body 4 and the spindle 2. You may make it take charge in cooperation.

  In the embodiment described above, the spindle 2 is always supported by the support member 26. However, the present invention is not limited to this configuration. For example, even if the spindle 2 is configured to be supported by the support member 26 only when the workpiece is processed, the processing reaction force generated on the spindle 2 when the workpiece is processed by the linear guide and the support member 26 is reduced. Since it can be supported, the horizontal machining center 1 can have rigidity during processing.

  Further, the support member 26 is not limited to the contact surface 26a1 formed of a resin. For example, a slide bearing having a contact surface formed of metal, or a rolling bearing such as a ball bearing or a roller bearing. Can also be used as a support member. Furthermore, a plurality of support members 26 may be provided. Further, the support member 26 is not necessarily disposed on the protruding side of the spindle 2. Furthermore, the linear drive mechanism (Z-axis feed mechanism) may be disposed below the spindle 2 as in the conventional art.

  Furthermore, the control method of the feed speed V of the spindle 2 is not limited to the control method described above, and for example, the feed speed V under load and the feed speed V under no load may be the same speed. The present invention is preferably applied to a horizontal machining center, but can also be applied to all machine tools in which a spindle is linearly driven in a horizontal direction.

1 is a side view showing a horizontal machining center according to an embodiment of the present invention. It is the side explanatory view seen from the side in the state where a part of composition of the horizontal machining center shown in Drawing 1 was seen through. It is front explanatory drawing seen from the front in the state which partially saw through the structure of the horizontal machining center shown in FIG. FIG. 2 is a top view illustrating the configuration of the horizontal machining center illustrated in FIG. 1 as viewed from the top in a partially transparent state. It is side surface explanatory drawing seen from the side surface in the state which partially saw through the structure of the head and spindle shown in FIG. It is front explanatory drawing seen from the front in the state which partially saw through the structure of the head and spindle shown in FIG. FIG. 6 is a top view illustrating the configuration of the head and spindle shown in FIG. It is a figure which shows the head main body member shown in FIG. 5, (A) is a front view, (B) is a side view, (C) is a top view. It is a figure which shows the head top plate member shown in FIG. 5, (A) is a front view, (B) is a bottom view. It is a figure which shows the spindle holding member shown in FIG. 5, (A) is a front view, (B) is a side view. It is sectional drawing which shows the supporting member shown in FIG. It is an enlarged view which expands and shows the F section of the supporting member shown in FIG. FIG. 6 is a side view illustrating a state in which the spindle illustrated in FIG. 5 protrudes from the head in a partially transparent state.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Horizontal machining center 2 Spindle 3 Head 4 Main body part 6 X-axis feed guide rail 15 Y-axis feed guide rail 26 Support member 26a Contact surface 27 Z-axis feed guide rail 28 Z-axis feed ball screw 31 Z-axis feed motor 33 Z-axis feed guide block 45 Z-axis feed nut 49 Fixed side member 49a Outer peripheral surface

Claims (9)

The control axis is three axes, the X axis and the Z axis that are orthogonal to each other in the horizontal direction, and the Y axis that is orthogonal to the X axis and the Z axis.
A spindle for processing the workpiece, a main body for holding the spindle, and a linear drive mechanism for linearly driving the spindle in the Z-axis direction;
The linear drive mechanism includes a linear guide that guides the spindle in the Z-axis direction and supports the spindle when the workpiece is processed.
In a state of waiting for processing the workpiece, at least a part of the spindle is stored in the main body, and when processing the workpiece, stored in the main body in the waiting state for processing. In the horizontal machining center in which at least a part of the stored portion of the spindle protrudes in the Z-axis direction from the main body,
In addition to the linear guide, a horizontal machining center comprising a support member that supports the spindle in a direction substantially orthogonal to the Z-axis direction at least when processing the workpiece.   A head that moves in the Y-axis direction while being guided by two parallel Y-axis feed guide rails extending in the Y-axis direction while holding the spindle, and the main body includes the head and the spindle 2. The horizontal machining center according to claim 1, wherein the horizontal machining center moves in the X-axis direction while being guided by two parallel X-axis feed guide rails extending in the X-axis direction.   The horizontal machining center according to claim 1, wherein the support member includes a contact surface that contacts the spindle, and the contact surface is formed of a resin.   4. The horizontal machining center according to claim 3, wherein the contact surface is made of ethylene-chlorotrifluoroethylene. The spindle is formed in a substantially cylindrical shape having an outer peripheral surface that comes into contact with the contact surface, and the support member is formed in a substantially cylindrical shape having the contact surface as an inner peripheral surface,
5. The horizontal machining center according to claim 3, wherein a spiral oil groove is formed on the contact surface.   3. The horizontal machining center according to claim 1, wherein the support member is disposed so as to be located closer to the workpiece than the position where the linear guide is disposed. 4.   The horizontal machining center according to claim 1, wherein the linear drive mechanism is disposed above the spindle. The support member is loaded when the spindle is linearly driven while machining the workpiece, and when the spindle is linearly driven without machining the workpiece. And is configured to support the spindle,
2. The feed speed in the Z-axis direction of the spindle during the load is configured to be slower than the feed speed of the spindle in the Z-axis direction during the no-load state. To 7. The horizontal machining center according to any one of 7 to 7. The control axis is three axes, the X axis and the Z axis that are orthogonal to each other in the horizontal direction, and the Y axis that is orthogonal to the X axis and the Z axis.
A spindle for processing the workpiece, a main body for holding the spindle, and a linear drive mechanism for linearly driving the spindle in the Z-axis direction;
The linear drive mechanism includes a linear guide that guides the spindle in the Z-axis direction and supports the spindle when the workpiece is processed.
In a state of waiting for processing the workpiece, at least a part of the spindle is stored in the main body, and when processing the workpiece, stored in the main body in the waiting state for processing. In the method of controlling a horizontal machining center in which at least a part of the storage portion of the spindle is protruded from the main body portion in the Z-axis direction,
In addition to the linear guide, at least when processing the workpiece, a support member that supports the spindle in a direction substantially perpendicular to the Z-axis direction,
The support member includes a contact surface formed of a resin that contacts the spindle,
The support member is further configured so that the spindle is linearly driven when the spindle is linearly driven while machining the workpiece and when the spindle is linearly driven without machining the workpiece. Configured to support the spindle at any time of loading,
A control method for a horizontal machining center, wherein a feed speed of the spindle in the Z-axis direction at the time of loading is slower than a feed speed of the spindle in the Z-axis direction at the time of no load.

Images