WO2012053358A1

WO2012053358A1 - Crankshaft mirror

Info

Publication number: WO2012053358A1
Application number: PCT/JP2011/072945
Authority: WO
Inventors: 武之鈴木; 史明浦
Original assignee: コマツＮｔｃ株式会社
Priority date: 2010-10-19
Filing date: 2011-10-05
Publication date: 2012-04-26
Also published as: CN103167922A; KR20130119422A; JP2012086309A

Abstract

Disclosed is a crankshaft mirror capable of preventing the occurrence of abnormal rocking motion of a swing head caused by swarf generated accompanying cutting. The upper end of a ball screw shaft (31) configuring a swing drive mechanism (24) of a swing head (21) swingably attached to a slide (8) is rotatably supported by a bearing device (33). Meanwhile, the lower end of said ball screw shaft (31) is in a free end state, and on the bottom end of the ball screw shaft (31) in the slide (8) a chute (60) is provided for expelling swarf generated accompanying cutting.

Description

Crankshaft mirror

The present invention relates to a crankshaft mirror for cutting a pin journal portion and a main journal portion of a crankshaft used for an engine or the like.

Conventionally, a crankshaft mirror configured to revolve while rotating a rotary cutter around a work (crankshaft) to cut a pin journal part or a main journal part of the work is known from Patent Document 1, for example. .

Japanese Patent No. 2529100

As shown in FIGS. 10A to 10C, a crankshaft mirror 100 according to Patent Document 1 is movable in a Z-axis direction parallel to the horizontal axis of a workpiece (crankshaft) 101 to be processed. A saddle 103 is provided on the top. On the saddle 103, a slide 104 is installed so as to be movable in the Y-axis direction perpendicular to the Z-axis direction and horizontal.

As shown in FIG. 10A, a swing head 105 is attached to the slide 104. One end of the swing head 105 is rotatably supported by a support shaft 106. The other end of the swing head 105 is supported by a swing drive mechanism 107 installed on the slide 104 so as to be swingable in the X-axis direction which is the vertical direction.
A rotating cutter 109 driven by a cutter motor 108 (see FIG. 10C) is attached to an intermediate portion of the swing head 105. A shaft member 110 is rotatably attached to the other end of the swing head 105.

As shown in FIG. 10B, the swing drive mechanism 107 includes a ball screw shaft 111 that extends in the X-axis direction on the other end side of the swing head 105. The upper and lower parts of the ball screw shaft 111 are rotatably supported by the slide 104 via a bearing device 112 and a bearing device 113, respectively.
A bevel gear 114 is attached to the upper end portion of the ball screw shaft 111. A bevel gear 115 that meshes with the bevel gear 114 is attached to the output shaft of the swing motor 116.
A nut member 117 is fitted in an intermediate portion of the ball screw shaft 111.

As shown in FIGS. 10B and 10C, between the nut member 117 and the shaft member 110, a first linear motion that guides the shaft member 110 to be displaceable in the Y-axis direction with respect to the nut member 117. A guide 121 is interposed. Further, a second linear motion guide 122 that guides the nut member 117 in the X-axis direction along the ball screw shaft 111 is interposed between the nut member 117 and the slide 104.

In the crankshaft mirror 100, the saddle 103 is moved in the Z-axis direction by a Z-axis direction feed mechanism (not shown).
Further, the slide 104 is moved in the Y-axis direction by the Y-axis direction feed mechanism 125 shown in FIG.
Further, in the swing drive mechanism 107 shown in FIGS. 10B and 10C, when the ball screw shaft 111 is rotationally driven by the operation of the swing motor 116, the nut fitted to the ball screw shaft 111 is engaged. The member 117 is moved in the vertical direction. As the nut member 117 moves in the vertical direction, the swing head 105 is swung in the vertical direction (X-axis direction) with the support shaft 106 (see FIG. 10A) as a fulcrum.

Then, while rotating the rotary cutter 109 mounted on the swing head 105, the saddle 103 linear motion in the Z-axis direction, the slide 104 linear motion in the Y-axis direction, and the swing motion of the swing head 105 in the X-axis direction. , The rotary cutter 109 is revolved around the workpiece 101 and moved along the horizontal axis of the workpiece 101 to cut the pin portion and the journal portion of the workpiece 101.

Incidentally, in the crankshaft mirror 100 according to Patent Document 1, as shown in FIG. 10B, the upper and lower portions of the ball screw shaft 111 in the swing drive mechanism 107 of the swing head 105 are respectively a bearing device 112 and a bearing device. 113 is rotatably supported by the slide 104 via the 113. That is, the crankshaft mirror 100 employs a both-end support structure as a support structure for the ball screw shaft 111. In addition, a part of the chips generated with the cutting by the rotary cutter 109 is scattered toward the bearing device 113.
For this reason, chips adhere to and accumulate on the bearing device 113, and the adhered and accumulated chips may be sandwiched between the bearing device 113 and the nut member 117, thereby hindering the swinging motion of the swing head 105. There is a problem that there is.

The present invention has been made in view of the above-described problems, and provides a crankshaft mirror that can prevent the occurrence of a swinging head swinging problem due to chips generated during cutting. It is intended to provide.

In order to achieve the above object, a crankshaft mirror according to the present invention comprises:
A slide that is movable in the Y-axis direction perpendicular to the Z-axis direction parallel to the horizontal axis of the workpiece to be machined, and
A swing head whose one end is supported by the slide so as to be freely rotatable by a support shaft and swingable in the X-axis direction which is the vertical direction;
A shaft member that is rotatably mounted on the other end of the swing head in parallel with the support shaft;
A screw shaft extending in the X-axis direction on the other end side of the swing head;
A nut member fitted to the screw shaft;
A first linear guide that is interposed between the nut member and the shaft member and guides the shaft member to be displaceable in the Y-axis direction with respect to the nut member;
In a crankshaft mirror comprising a second linear motion guide interposed between the nut member and the slide and guiding the nut member in the X-axis direction along the screw shaft,
The screw shaft is rotatably supported at its upper end side by a bearing device, while its lower end side is in a free end state.
A chute is provided on the lower end side of the screw shaft in the slide for discharging chips generated by cutting (first invention).

In the present invention, an engaging convex portion is provided on the other end side of the swing head, and a sandwiching guide having a concave portion sandwiching the engaging convex portion and extending in the X-axis direction is fixed to the slide. Is preferable (second invention).

In the present invention, the first linear motion guide includes at least two Y-axis guide rails that extend in the Y-axis direction and are fixed to the shaft member or the nut member in an arrangement parallel to the X-axis direction; Y-axis direction guide blocks that are slidably provided on the Y-axis direction guide rails, respectively, and the second linear motion guide extends in the X-axis direction in parallel with the screw shaft, and An X-axis direction guide rail that is fixed to the slide, and at least two X-axis direction guide blocks that are slidably provided on the X-axis direction guide rail and are arranged side by side in the X-axis direction. It is preferable (third invention).

In the crankshaft mirror of the first invention, the upper end side of the screw shaft constituting the swing drive mechanism of the swing head is rotatably supported by the bearing device, while the lower end side thereof is in a free end state. As a result, an open space can be formed on the lower end side of the screw shaft. And the chute | shoot part for discharging | emitting the swarf which generate | occur | produces with cutting is provided in the lower end side of this screw shaft. For this reason, the chips flying toward the lower end portion of the screw shaft are discharged through the chute portion. Therefore, it is possible to prevent the occurrence of the problem of swinging motion of the swing head due to chips.

Further, by adopting the configuration of the second invention, the tilting load of the swing head in the Z-axis direction can be firmly received by the sandwiching guide, and the swing head swinging motion can be performed smoothly and stably. is there.

Further, by adopting the configuration of the third invention, the Z-axis direction tilting load of the swing head can be firmly received by the first linear motion guide and the second linear motion guide, respectively. There is an effect that exercise is performed smoothly and stably.

1 is an overall perspective view of a crankshaft mirror according to a first embodiment of the present invention. State diagram with workpiece set between workpiece heads Front view of cutter unit AA line sectional view of FIG. BB sectional view of FIG. CC sectional view of FIG. The front view of the cutter unit of the crankshaft mirror which concerns on the 2nd Embodiment of this invention DD sectional view of FIG. EE sectional view of FIG. FIG. 2 is an explanatory view of a conventional crankshaft mirror, a front view of a cutter unit (a), a sectional view taken along line GG of (a), and a plan view of the cutter unit (c).

Next, specific embodiments of the crankshaft mirror according to the present invention will be described with reference to the drawings.

[First Embodiment]
<Description of schematic configuration of crankshaft mirror: see FIG. 1>
A crankshaft mirror 1 shown in FIG. 1 includes a bed 2 constituting a machine base serving as a base of a main body portion, two work heads 3 and 3 installed on the bed 2 so as to face each other, Two cutter units 4 and 4 'installed between the work heads 3 and 3 are provided.

<Description of chuck: See FIG. 2>
As shown in FIG. 2, chucks 6 for clamping the workpiece (crankshaft) 5 are arranged on the opposing surfaces of the workpiece heads 3 and 3, respectively.

<Work description: See Fig. 2>
The workpiece 5 is a crankshaft used for a four-cylinder engine, for example. The workpiece 5 has a required main journal portion 5a arranged at a predetermined interval in a direction along the horizontal axis. A pin journal portion 5c is formed between the main journal portions 5a adjacent to each other via a counterweight portion 5b.

<Overview of cutter unit: See FIGS. 1 to 3>
As shown in FIG. 1, each

cutter unit

4, 4 ′ has a saddle 7 installed on the bed 2 movably in the Z-axis direction parallel to the horizontal axis of the workpiece 5 to be machined (see FIG. 2). I have.
As shown in FIG. 3, a slide 8 is installed on the saddle 7 so as to be movable in a Y-axis direction orthogonal to the Z-axis direction and horizontal.

<Overview of work rest: See Figs. 1 and 2>
As shown in FIG. 1, the saddle 7 in one of the two cutter units 4 and 4 'has a saddle 7 in a state where the relative position with respect to the cutter unit 4' is kept constant. 9 is fixed. For example, as shown in FIG. 2, the work rest 9 clamps the main journal portion 5 a adjacent to the processed portion when the pin journal portion 5 c of the workpiece 5 is processed, and the workpiece 5 swings during processing. It plays the role of supporting not to be.

<Description of the saddle Z-axis feed mechanism: see FIG. 4>
As shown in FIG. 4, the Z-axis direction feed mechanism 10 that moves the saddle 7 in the Z-axis direction includes a ball screw shaft 11 that extends on the bed 2 in the Z-axis direction. A ball nut 12 fixed to the saddle 7 is fitted to the ball screw shaft 11. The end of the ball screw shaft 11 is connected to the output shaft of the Z-axis direction feed motor 14 via a coupling 13.
A spiral screw groove is formed on the outer peripheral surface of the ball screw shaft 11.
A screw groove facing the screw groove of the ball screw shaft 11 is formed on the inner peripheral surface of the ball nut 12.
A plurality of balls are slidably loaded in a spiral ball rolling path formed by the thread groove of the ball screw shaft 11 and the thread groove of the ball nut 12.
When the ball screw shaft 11 is rotationally driven by the operation of the Z-axis feed motor 14, the ball nut 12 is moved in the Z-axis direction, and the saddle 7 is moved in the Z-axis direction as the ball nut 12 moves. .

<Description of slide Y-axis direction feed mechanism: see FIG. 3>
As shown in FIG. 3, the Y-axis direction feeding mechanism 15 that moves the slide 8 in the Y-axis direction includes a ball screw shaft 16 that extends on the saddle 7 in the Y-axis direction. A ball nut 17 fixed to the slide 8 is fitted on the ball screw shaft 16. A bevel gear 18 is attached to the end of the ball screw shaft 16. A bevel gear 19 that meshes with the bevel gear 18 is attached to the output shaft of the Y-axis direction feed motor 20.
When the ball screw shaft 16 is rotationally driven by the operation of the Y-axis feed motor 20, the ball nut 17 is moved in the Y-axis direction, and the slide 8 is moved in the Y-axis direction as the ball nut 17 moves.

<Description of swing head: See FIG. 3>
A swing head 21 is attached to the slide 8. One end of the swing head 21 is rotatably supported by the slide 8 via a support shaft 22. A shaft member 23 is attached to the other end of the swing head 21.

<Description of shaft member: See FIG. 5>
As shown in FIG. 5, the shaft member 23 includes a shaft portion 23a that is rotatably supported by the other end portion of the swing head 21, and a guide rail mounting plate that is integrally provided on the base end side of the shaft portion 23a. Part 23b. The shaft member 23 is connected to a swing drive mechanism 24 installed on the slide 8 on the other end side of the swing head 21. The swing drive mechanism 24 swings the other end of the swing head 21 in the X-axis direction that is the vertical direction with the support shaft 22 as a fulcrum.

<Description of Slide Housing: See FIG. 5>
On the other end side of the slide 8, a U-shaped accommodating portion 8a that is open toward the other end portion of the swing head 21 to which the shaft member 23 is attached is formed.

<Description of Rotating Cutter Drive Mechanism: See FIG. 5>
A cutter drum 25 is rotatably incorporated in an intermediate portion of the swing head 21. The cutter drum 25 is connected to a cutter motor 27 via a power transmission mechanism 26 constituted by required gears, a power transmission shaft, and the like.
A rotating cutter 29 is attached to the cutter drum 25 via a cutter adapter 28.
Thus, the rotary cutter 29 is driven to rotate by the operation of the cutter motor 27.

<Description of Swing Head Oscillation Drive Mechanism: See FIG. 6>
As shown in FIG. 6, the swing drive mechanism 24 includes a ball screw shaft 31 that extends in the X-axis direction on the other end side of the swing head 21.

<Description of Ball Screw Shaft Support Structure, Nut Member, and Power Transmission Mechanism: See FIG. 6>
The upper portion of the ball screw shaft 31 is rotatably supported by a gear box 32 fixed to the upper surface portion of the slide 8 via a bearing device 33. On the other hand, the lower part of the ball screw shaft 31 is not supported by the bearing device, and the lower end side of the ball screw shaft 31 is in a free end state. That is, in the crankshaft mirror 1 of the first embodiment, a cantilever support structure is adopted as a support structure for the ball screw shaft 31. Thereby, an open space can be formed below the ball screw shaft 31.
A nut member 35 is fitted in an intermediate portion of the ball screw shaft 31. The nut member 35 includes a ball nut 35a that is screwed onto the ball screw shaft 31 via a plurality of balls, and a ball nut mounting block 35b on which the ball nut 35a is fitted and fixed.
A bevel gear 36 is attached to the upper end portion of the ball screw shaft 31. A bevel gear 37 that meshes with the bevel gear 36 is attached to the output shaft of the swing motor 38.

<Description of the first linear motion guide: see FIG. 6>
Between the nut member 35 and the shaft member 23, there is a first linear guide 41 that guides the shaft member 23 so as to be displaceable in the Y-axis direction (direction perpendicular to the paper surface of FIG. 6) with respect to the nut member 35. Intervened. The first linear motion guide 41 includes a single Y-axis direction guide rail 41a extending in the Y-axis direction. The Y-axis direction guide rail 41 a is fixed to a guide rail mounting plate portion 23 b in the shaft member 23.
A Y-axis direction guide block 41b is slidably mounted on the Y-axis direction guide rail 41a. The Y-axis direction guide block 41b is fixed to the nut member 35.
In the Y-axis direction guide rail 41a, a rolling groove (not shown) is formed along its longitudinal direction. In the Y-axis direction guide block 41b, a rolling groove (not shown) facing the rolling groove of the Y-axis direction guide rail 41a. A dynamic groove is formed.
A linear ball rolling path formed by the rolling groove of the Y-axis direction guide rail 41a and the rolling groove of the Y-axis direction guide block 41b is loaded with a plurality of balls (not shown) in a freely rolling manner. .
In addition, each Y-axis direction guide rail 41a may be fixed to the nut member 35, and each Y-axis direction guide block 41b may be fixed to the guide rail mounting plate portion 23b.

<Description of the second linear motion guide: see FIG. 6>
Between the nut member 35 and the slide 8, a second linear motion guide 42 that guides the nut member 35 in the X-axis direction along the ball screw shaft 31 is interposed. The second linear motion guide 42 includes one X-axis direction guide rail 42 a that extends in the X-axis direction parallel to the ball screw shaft 31 and is fixed to the slide 8.
An X-axis direction guide block 42b is slidably mounted on the X-axis direction guide rail 42a. The X-axis direction guide block 42b is fixed to the nut member 35.

<Description of piping for supplying lubricating oil to linear guide, etc .: See FIG. 6>
A first swivel joint 44 is attached to the upper part on the other end side of the swing head 21 via a bracket 43. A second swivel joint 46 is attached to the upper portion of the nut member 35 via a bracket 45.
A lubricating oil distributor 47 is attached to the side surface of the nut member 35.
The first swivel joint 44 and the second swivel joint 46 are connected by a main hose 48. The second swivel joint 46 and the lubricating oil distributor 47 are connected by a main steel pipe 49.
A distribution steel pipe (lubricating oil distribution pipe) 51 is piped from the lubricating oil distributor 47 toward the sliding portion of the first linear motion guide 41. A distribution steel pipe 52 is provided from the lubricant distributor 47 toward the sliding portion of the second linear motion guide 42. A distribution steel pipe 53 is piped from the lubricant distributor 47 toward the threaded portion between the ball nut 35 a and the ball screw shaft 31.
Thus, by attaching the lubricating oil distributor 47 to the nut member 35, the

distribution steel pipes

51, 52, 53 can be made as short as possible.

<Explanation of chute part: See FIG. 3>
As shown in FIG. 3, a chute portion 60 is formed on the lower end side of the ball screw shaft 31 in the slide 8 for discharging chips generated by cutting with the rotary cutter 29. This chute | shoot part 60 has the inclined surface 60a which inclines below toward the bed 2 side.
In this way, the chips flying toward the lower end portion of the ball screw shaft 31 are dropped along the inclined surface 60a of the chute portion 60 by gravity and discharged into the bed 2. The chips discharged inside the bed 2 are carried out of the machine by a chip discharge device (not shown).

<Explanation of sandwiching structure: see FIGS. 3, 5 and 6>
As shown in FIGS. 3 and 5, the other end portion of the swing head 21 is provided with an engaging convex portion 21 a that protrudes outward. A sandwiching guide 61 having a recess for sandwiching the engaging projection 21 a and extending in the X-axis direction is provided on the slide 8. The sandwiching guide 61 is disposed outside the swing head 21 on the opening side of the accommodating portion 8 a of the slide 8.
The sandwiching structure 62 configured to engage the engagement convex portion 21a and the sandwiching guide 61 serves to receive the Z-axis direction tilting load F (see FIG. 6) for tilting the swing head 21 in the Z-axis direction. do.

<Overview of cutting operation: See FIGS. 2 to 6>
In the crankshaft mirror 1 configured as described above, the saddle 7 is moved in the Z-axis direction by the Z-axis direction feed mechanism 10 shown in FIG. Further, the slide 8 is moved in the Y-axis direction by the Y-axis direction feed mechanism 15 shown in FIG. 5 and FIG. 6, when the ball screw shaft 31 is rotationally driven by the operation of the swing motor 38, the nut member 35 fitted to the ball screw shaft 31 is moved. Moved up and down. As the nut member 35 moves in the vertical direction, the swing head 21 swings in the vertical direction (X-axis direction) with the support shaft 22 as a fulcrum.
Then, while the rotary cutter 29 is rotated by the operation of the cutter motor 27 shown in FIG. 5, the linear motion of the saddle 7 in the Z-axis direction (see FIG. 4) and the linear motion of the slide 8 in the Y-axis direction (FIG. 3). 2) and the swing motion of the swing head 21 in the X-axis direction (see FIG. 3), the rotary cutter 29 is revolved around the work 5 (see FIG. 2), and along the horizontal axis of the work 5 Then, the pin journal part 5c and the main journal part 5a of the workpiece 5 are cut by moving in the Z-axis direction.

During the swinging motion of the swing head 21, the nut member 35 is a motion that draws a linear trajectory in the vertical direction, whereas the shaft member 23 is a motion that draws an arc-shaped trajectory. It is structurally impossible to connect the shaft member 23 directly. Therefore, between the nut member 35 and the shaft member 23, the first linear motion guide 41 that guides the shaft member 23 so as to be displaceable in the Y-axis direction with respect to the nut member 35 is interposed. Thereby, the nut member 35 and the shaft member 23 can be connected without any structural problem, and the swing driving force is smoothly transmitted from the nut member 35 to the shaft member 23.

<Description of Effects of First Embodiment: See FIGS. 3 and 6>
In the crankshaft mirror 1 of the first embodiment, the upper end side of the ball screw shaft 31 constituting the swing drive mechanism 24 of the swing head 21 is rotatably supported by the bearing device 33, while the lower end side is a free end. State. Thereby, an open space can be formed below the ball screw shaft 31. And the chute | shoot part 60 for discharging | emitting the chip which generate | occur | produces with cutting is formed in the lower end side of this ball screw shaft 31. As shown in FIG. For this reason, the chips flying toward the lower end portion of the ball screw shaft 31 are discharged via the chute portion 60. Therefore, the lowering operation of the nut member 35 is not hindered due to the chips, and the occurrence of the problem of the swinging motion of the swing head 21 due to the chips can be prevented in advance.
Further, according to the crankshaft mirror 1 of the first embodiment, the tilting load F in the Z-axis direction of the swing head 21 is firmly received by the sandwiching structure 62. Thereby, there is an effect that the swinging motion of the swing head 21 is performed smoothly and stably.

[Second Embodiment]
7 is a front view of a cutter unit of a crankshaft mirror according to the second embodiment of the present invention, FIG. 8 is a sectional view taken along the line DD of FIG. 7, and FIG. Line cross-sectional views are shown respectively.
In addition, in the crankshaft mirror 1A of the second embodiment, the same or similar parts as those of the crankshaft mirror 1 of the first embodiment are designated by the same reference numerals, and detailed description thereof is omitted. The following description will focus on differences from the crankshaft mirror 1 of the first embodiment.

<Description of Structural Differences between First and Second Linear Motion Guides: See FIG. 9>
In the crankshaft mirror 1A of the second embodiment, the first linear motion guide 41 ′ interposed between the nut member 35 and the shaft member 23 has two Y-axis directions extending in the Y-axis direction. Guide rails 41a 'and 41a' are provided. These two Y-axis direction guide rails 41a ′ and 41a ′ are fixed to the guide rail mounting plate portion 23b of the shaft member 23 in a parallel arrangement with a predetermined interval in the X-axis direction. A Y-axis direction guide block 41b 'is slidably mounted on each Y-axis direction guide rail 41a'. Each Y-axis direction guide block 41 b ′ is fixed to the nut member 35.
Further, in the second linear motion guide 42 ′ interposed between the nut member 35 and the slide 8, two X axis direction guides arranged side by side in the X axis direction on the X axis direction guide rail 42 a ′. Blocks 42b 'and 42b' are slidably mounted. Each X-axis direction guide block 42 b ′ is fixed to the nut member 35.

<Description of flange of nut member: See FIG. 9>
A flange 43 is formed at an attachment site of the X-axis direction guide block 42b ′ in the ball nut attachment block 35b of the nut member 35 so as to project in the X-axis direction. Thereby, the attachment possible area | region of the X-axis direction guide block 42b can be expanded, without sacrificing the movement stroke of the nut member 35 in the X-axis direction.

<Description of Effects of Second Embodiment: See FIGS. 7 to 9>
In the crankshaft mirror 1A of the second embodiment, a Z-axis direction tilting load F (see FIG. 9) for tilting the swing head 21 in the Z-axis direction is applied from the shaft member 23 to the first linear motion guide 41. ', Transmitted to the slide 8 via the nut member 35 and the second linear motion guide 42'.

Here, when the Z-axis direction tilt load F is transmitted from the shaft member 23 to the nut member 35 via the first linear motion guide 41 ′, the Z-axis direction tilt load F is the X-axis direction (vertical direction). Y-axis direction guide rails 41a 'and 41a' arranged in parallel to each other, and a total of two Y-axis direction guide blocks 41b 'and 41b' provided slidably on each Y-axis direction guide rail 41a ' And will be firmly accepted.
When the Z-axis direction tilt load F is transmitted from the nut member 35 to the slide 8 via the second linear motion guide 42 ′, the Z-axis direction tilt load F is fixed to the slide 8 in the X-axis direction. The guide rail 42a 'and the two X-axis direction guide blocks 42b' and 42b 'that are slidably provided on the X-axis direction guide rail 42a' and are arranged side by side in the X-axis direction (vertical direction) To be accepted.

Needless to say, according to the crankshaft mirror 1A of the second embodiment, the same operational effects as those of the crankshaft mirror 1 of the first embodiment can be obtained. Furthermore, according to the crankshaft mirror 1A of the second embodiment, the tilting load in the Z-axis direction of the swing head 21 is firmly received by the first linear motion guide 41 ′ and the second linear motion guide 42 ′. For this reason, in the crankshaft mirror 1 of the first embodiment, the tilting load F in the Z-axis direction of the swing head 21 carried by the sandwiching structure 62 (see FIGS. 3 and 5) by the engaging convex portion 21a and the sandwiching guide 61 is carried out. The pinching structure 62 required in the crankshaft mirror 1 of the first embodiment can be eliminated as shown in FIGS. 7 and 8. Therefore, the ball screw shaft 31 and the nut member 35 accommodated in the accommodating portion 8a of the slide 8 can be easily accessed, and the maintainability of the swing drive mechanism 24 of the swing head 21 can be improved. is there.

As mentioned above, although the crankshaft mirror of the present invention has been described based on a plurality of embodiments, the present invention is not limited to the configurations described in the above embodiments, and the configurations described in the embodiments are appropriately combined. The configuration can be changed as appropriate without departing from the spirit of the invention.

Since the crankshaft mirror of the present invention has a characteristic that it is possible to prevent the occurrence of a swinging head malfunction caused by the chips generated by the cutting process, The present invention can be suitably used for countermeasures against troubles of swinging motion of a cutting machine having a drive mechanism.

DESCRIPTION OF

SYMBOLS

1,1A Crankshaft mirror 5 Work piece 8 Slide 21 Swing head 21a Engagement convex part 22 Support shaft 23 Shaft member 31 Ball screw shaft 35 Nut member 41, 41 '1st

linear motion guide

41a, 41a' Y-axis

direction guide rail

41b, 41b 'Y-axis direction guide block 42, 42' Second

linear motion guide

42a, 42a 'X-axis

direction guide rail

42b, 42b' X-axis direction guide block 60 Chute part 61 Pinch guide 62 Pinch structure

Claims

A slide that is movable in the Y-axis direction perpendicular to the Z-axis direction parallel to the horizontal axis of the workpiece to be machined, and
A swing head whose one end is supported by the slide so as to be freely rotatable by a support shaft and swingable in the X-axis direction which is the vertical direction;
A shaft member that is rotatably mounted on the other end of the swing head in parallel with the support shaft;
A screw shaft extending in the X-axis direction on the other end side of the swing head;
A nut member fitted to the screw shaft;
A first linear guide that is interposed between the nut member and the shaft member and guides the shaft member to be displaceable in the Y-axis direction with respect to the nut member;
In a crankshaft mirror comprising a second linear motion guide interposed between the nut member and the slide and guiding the nut member in the X-axis direction along the screw shaft,
The screw shaft is rotatably supported at its upper end side by a bearing device, while its lower end side is in a free end state.
A crankshaft mirror characterized in that a chute part for discharging chips generated by cutting is provided on the lower end side of the screw shaft in the slide.
An engagement protrusion is provided on the other end side of the swing head, and a sandwiching guide extending in the X-axis direction having a recess for sandwiching the engagement protrusion is fixed to the slide. The described crankshaft mirror.
The first linear motion guide includes at least two Y-axis guide rails that extend in the Y-axis direction and are fixed to the shaft member or the nut member in an arrangement parallel to the X-axis direction, and the Y-axis direction. Y-axis direction guide block provided slidably on each guide rail,
The second linear motion guide extends in the X-axis direction in parallel to the screw shaft and is fixed to the slide, and is slidably provided on the X-axis guide rail. The crankshaft mirror according to claim 1, comprising at least two X-axis direction guide blocks arranged side by side in the X-axis direction.