JP2000033530A - Work table feed mechanism of machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a feed screw from obstructing the recovery of chips and coolant and prevent chips from depositing in a cover mechanism as is observed conventionally. SOLUTION: In a work table feed mechanism of a machine tool constituted in such a way that a work table 3 advances and retracts in the horizontal direction for a tool main spindle along a pair of guide ways 2 parallel with the tool main spindle, a recessed part 4 forming a chip recovery space is formed between a pair of guide ways 2 fixed on a bed 100, and a pair of right and left feed screws 5 are arranged on the outside of a pair of guide ways 2 arranged on the outside of the recessed part 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work table feeding mechanism for a machine tool, in which a work table advances and retreats in a horizontal direction with respect to a tool spindle along a pair of guideways parallel to the tool spindle. The work table is moved toward the tool spindle outside the recess forming the space for chip recovery formed between the pair of guideways formed, or outside the recess and outside the pair of guideways. The present invention relates to a work table feed mechanism of a machine tool in which a pair of left and right feed screws to be moved forward and backward are arranged.

[0002]

2. Description of the Related Art In a conventional work table feed mechanism for a machine tool (Japanese Patent Laid-Open No. 61-65747), as shown in FIG. 5, a work table T is moved along a Z-axis parallel to the axis of the tool spindle. It is guided so as to be able to advance and retreat between the processing area on the side and the pallet changing position on the pallet changing device side.

According to this configuration, the pallet on the work table T is brought to a position where the pallet is exchanged with the pallet exchanging device by retracting the work table T having completed the machining operation in the machining operation area with respect to the tool spindle. ,
Conversely, by moving the work table forward toward the tool spindle, the pallet on the work table T can be moved from the exchange operation position to the working area. For this reason, there is an advantage that a single table feed device for the machining feed operation can be used for the pallet changing operation.

[0004]

In the above-mentioned conventional ordinary Z-axis table feeder, as shown in FIG. 5, a Z-axis feed screw S is provided with a pair of guides for guiding a work table T in the Z-axis direction. Are arranged at the central position of the parallel guide way G, that is, the central position in the width direction of the table T.
For this reason, the feed screw S is disposed substantially directly below the tool spindle.

In this case, in order to prevent the feed screw from being contaminated by chips falling from the processing point where the cutting tool at the tip of the tool spindle cuts the work, a cover mechanism surrounding the feed screw is provided, or As shown in FIG. 5, the length of the table T in the Z direction is extended so as to also serve as a cover function. The cover mechanism or the extended table T for the feed screw S traverses the falling area of the chips falling from the processing point toward the bed, so that the chips accumulate on the cover mechanism or the table T. However, there were problems such as the inability to completely collect chips.

A conventional machine tool (Japanese Patent Publication No. 60-239)
36), as shown in FIG. 6, the chip collecting device R is arranged in the bed B so as to be located below the slide-type cover mechanism C that covers the feed screw, and chips are cut from the processing point. Although it is configured to drop directly into the collecting device R, there is a problem that a part of the chips is deposited on the cover mechanism C.

Therefore, the present inventor has fixed a work table feed mechanism of a machine tool of a type in which a work table advances and retreats in a horizontal direction with respect to a tool spindle along a pair of guideways parallel to the tool spindle. The work table is moved back and forth toward the tool spindle outside the concave portion forming the space for chip recovery formed between the pair of guideways or outside the concave portion and outside the pair of guideways. Focusing on the technical idea of the present invention of arranging a pair of left and right feed screws, as a result of further research and development, the pair of feed screws did not hinder the collection of chips and coolant, so that a conventional cutting screw was used. Achieving the objective of eliminating the accumulation of chips on the cover mechanism and eliminating problems such as the inability to completely collect chips and coolant. And it reached the present invention.

[0008]

According to a first aspect of the present invention, there is provided a work table feed mechanism for a machine tool.
In a work table feed mechanism of a machine tool of a type in which a work table is moved in a horizontal direction with respect to a tool spindle along a pair of guide ways parallel to a tool spindle, a work table is cut between the pair of guide ways fixed to a base. A recess forming a space for collecting waste is formed, and a pair of left and right feed screws for moving the work table toward and away from the tool spindle are arranged outside the recess.

According to a second aspect of the present invention (a second aspect of the present invention), in the work table feed mechanism for a machine tool according to the first aspect, the pair of left and right feed screws are disposed outside the recess. It is arranged outside the guideway.

The work table feed mechanism of the machine tool according to the present invention (third invention according to claim 3) is configured such that the first or second work table feed mechanism is provided.
In the present invention, the chip collecting device is arranged such that a collecting port for collecting chips and a coolant falling from a processing point opens upward at least at a position below the work table in the concave portion of the base. is there.

According to a fourth aspect of the present invention, there is provided the work table feed mechanism for a machine tool, wherein the first or second work table feed mechanism is provided.
In the present invention, a splash cover is arranged inside each of the pair of guideways along each guideway.

[0012] In the work table feed mechanism for a machine tool according to the present invention (fifth invention according to claim 5), in the fourth invention, the splash cover is arranged so that the splash cover moves in the Z-axis direction as the work table moves forward and backward. It comprises a lower cover capable of changing the cover range, and a fixed cover disposed upright above the lower cover.

According to a sixth aspect of the present invention, there is provided a work table feed mechanism for a machine tool according to any one of the first to fifth aspects, wherein each feed screw of the pair of left and right feed screws is It is configured to be rotationally driven by an independent drive motor.

[0014]

The work table feed mechanism of the machine tool according to the first aspect of the present invention has the above-mentioned structure, wherein the pair of left and right feed screws for moving the work table toward and away from the tool spindle is connected to the pair of left and right feed screws fixed to a base. Since it is arranged outside the recess forming the space for chip recovery formed between the guideways of the above, the pair of feed screws do not hinder the collection of chips and coolant, so that the conventional chips The effect of eliminating the accumulation on the cover mechanism and the problem of the inability to completely collect chips and coolant can be achieved.

In the work table feed mechanism for a machine tool according to a second aspect of the present invention, the pair of left and right feed screws are disposed outside the pair of guideways disposed outside the recess in the first aspect. Therefore, the pair of feed screws does not hinder the collection of the chips and the coolant, thereby preventing the chips from accumulating on the cover mechanism and preventing the chips and the coolant from being completely collected. And the like are solved.

In the work table feeding mechanism for a machine tool according to the third aspect of the present invention, in the first or second aspect, the collection port is opened upward at a position below the work table in the recess of the base. Since the chip collecting device is arranged so as to perform the above operation, there is an effect that the chips and the coolant falling from the processing point are effectively collected.

In the work table feeding mechanism for a machine tool according to a fourth aspect of the present invention, in the first or second aspect, a splash cover is arranged along each guide way inside each of the pair of guide ways. Therefore, there is an effect that scattering of chips and coolant is prevented.

According to a fifth aspect of the present invention, in the work table feed mechanism for a machine tool according to the fourth aspect of the present invention, the splash cover is configured such that a cover range in the Z-axis direction can be varied in accordance with the forward / backward movement of the work table. Since the cover and the fixed cover are arranged in an upright state above the lower cover, the effect of reliably preventing chips and coolant from being scattered in accordance with the forward / backward movement of the work table.

The work table feed mechanism for a machine tool according to a sixth aspect of the present invention is the work table feed mechanism according to any one of the first to fifth aspects, wherein each of the pair of left and right feed screws is rotated by an independent drive motor. Since it is configured to be driven, there is no need for a rotary drive mechanism for rotating and driving a pair of left and right feed screws by one drive motor, so that the device is made compact and inexpensive.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described.
This will be described with reference to the drawings.

(Embodiment) A work table feed mechanism for a machine tool according to the present embodiment, as shown in FIG. 1 to FIG. 4, moves a work table 3 along a pair of guideways 2 parallel to a tool spindle 1. In a work table feed mechanism of a machine tool of a type that moves in a horizontal direction with respect to 1,
The bed 100 has a recess 4 defining a space for chip recovery between the pair of guideways 2 fixed on the bed.
Is formed, and a pair of left and right feed screws 5 are arranged further outside the pair of guideways 2 arranged outside the recess 4.

As shown in FIGS. 1 to 3, the work table feeding mechanism of the machine tool of the present embodiment
Is composed of a spindle head 11, a spindle unit 12, and a tool 13. A spindle unit 12 that rotatably supports the tool spindle 1 is integrally attached to the spindle head 11 so that a tool 13 can be attached to the tip of the tool spindle 1. The spindle head 11 is guided on the front surface of the column 101 so as to be vertically movable. The column 101 is driven by a X-axis servomotor 61 via a ball screw 71, and its position is controlled along a pair of guideways 21 formed on the bed 100 so as to extend in the X-axis direction perpendicular to the longitudinal direction. .

The spindle head 11, which integrally supports the spindle unit 12, is driven by a Y-axis servomotor 62 mounted on the upper surface of the column via a ball screw 72, and moves vertically (in the Y-axis direction) on the front surface of the column 101. The position is controlled along a pair of parallel guideways 22 extending and separated in the X-axis direction.

At the center of the bed 100 in the width direction (X-axis direction), a recess 4 is formed extending in the longitudinal direction (Z-axis direction) from the rear end face on the left side to the front end face on the right side in FIG. Have been. The recess 4 is open to the floor and faces the floor, and the right end is closed by the front wall of the bed 100. A chip recovery device 8 for recovering chips and coolant falling from a processing point during processing by the tool 13 includes:
The horizontal portion is inserted from the rear end opening of the bed 100 and advances into the concave portion 4, and the recovery port 81 is directed upward at least at a position below the work table 3 in the concave portion 4 of the bed 100. The opening is formed in a tapered shape so that the opening area increases as going upward. The recess 4 is opened on the upper surface of the bed 100 at the front side of the column 101, so that chips and coolant directly fall into the collection port 81.

In the chip collecting device 8, one sprocket 82 is rotatably disposed at one end in the recess of the bed 100 below the tapered collecting port 81, and from the rear end face of the bed 100. An intermediate sprocket (not shown) is provided at a position protruding outside, and the other sprocket (not shown) rotationally driven by the motor 84 is provided at a position obliquely above the intermediate sprocket. A chain 86 having a predetermined width in which scrapers 85 are arranged at regular intervals is wound around the three sprockets 82 and the chips and coolant that have fallen into the tapered recovery port 81 are put on the bed 100. It is configured to be conveyed to the rear of and discharged.

On the upper surface of the bed 100 outside the tapered collecting port 81, a pair of left and right linear guideways 2 constituting a Z-axis orthogonal to the X-axis and the Y-axis are horizontally disposed, and the work 31 is placed thereon. A work table 3 for rotatably supporting a work pallet 32 to be placed is guided movably in a horizontal direction with respect to the tool spindle 1.

A pair of left and right ball screws 5 are disposed further outside the pair of left and right linear guideways 2 disposed on the upper surface of the bed 100. These ball screws 5
Are projecting portions 3 protruding to both outsides of the work table 3
3 is screw-engaged with a nut 51 disposed in the nut 3. Thereby, each feed screw of the pair of left and right feed screws 5 is configured to be rotationally driven by an independent drive motor 50. That is, at one end of each of the pair of left and right ball screws 5, a servomotor 50 having a speed reduction mechanism 52 and operated synchronously is disposed, and is configured to advance and retreat the work table 3 with respect to the tool spindle 1. I have.

A splash cover 9 arranged along each guideway 2 inside each of the pair of guideways 2 and above the tapered recovery port 81.
The lower cover 91 includes a lower cover 91 that can change the cover range in the Z-axis direction in accordance with the forward / backward movement of the work table 3, and a fixed cover 90 that is arranged upright above the lower cover.

That is, as shown in FIG. 4, one end of a fixed cover 90 having a U-shaped cross section formed of a rectangular upper surface portion 900 and rectangular side surface portions 901 and 902 is provided above the tapered recovery port 81. It is fixed by a bracket 92 implanted in the bed 100 on the column side. The lower edges of the rectangular side surfaces 901 and 902 are located slightly higher than the horizontal upper surface of the table 3. One rectangular side 90
1 has a rectangular window 9 for directly viewing the spindle head 11.
No. 03 is formed, and two locking members 905 movably locked to a guide rail 904 disposed in the longitudinal direction along one side edge of the upper surface portion 900 at two places in the Z-axis direction. A slidably supported slide door 906 is provided. The sliding door 906 is formed by attaching a transparent plate to a frame.

The telescopic cover serving as the lower cover 91 is provided on both outer sides of the fixed cover 90 and inside the pair of left and right linear guideways 2 from the lower end edges of both side portions 901 and 902 of the fixed cover 90. Is provided so as to cover the gap from the upper surface to a little below. That is, the telescopic cover is attached to the worktable 3
A structure in which one end is fixed to the vicinity of the base of the protruding portion 33 formed on both outer sides, and the other end is wound in a winding device 93 arranged close to the bracket 92 supporting the fixed cover 90. And expands and contracts in accordance with the reciprocation of the work table 3 with respect to the tool spindle.

Around three surfaces of the work table 3,
A fixed cover 94 having a height overlapping with the lower end of the inner wall surface of each of the side surfaces 901 and 902 of the fixed cover 90 is disposed in the inner wall surface of the both sides of the fixed cover.

A winder in which one end of a cover is fixed to both ends of the front surface 102 of the column 101 in the X-axis direction, and the other end is fixed to brackets 95 implanted at both ends of the bed 100 in the width direction. Left and right telescopic covers 97 and 98 wound around inside 96 are provided, and the right and left telescopic covers 97 and 98 are moved according to the movement of the column 101 in the X-axis direction.
98 is configured to expand and contract.

In the work table feed mechanism of the machine tool according to the present embodiment having the above structure, when the servo motor 50 is operated synchronously, the pair of left and right ball screws 5 are synchronously driven to rotate via the speed reduction mechanism 52. The work table 3 is moved forward and backward with respect to the tool spindle 1 along a pair of left and right linear guideways 2 constituting a Z axis on the upper surface of the bed 100.

In other words, the work table 3 supports the work guide 32 in a rotatable manner by rotating the pair of left and right ball screws 5 as shown in FIG. 2, the rectangular upper surface portion 900 and the rectangular side surface portions 90
1 and 902, a fixed cover 90 having a U-shaped cross section.
To enter. Thereby, the processing in the processing unit 10 is performed in a state of being surrounded by the fixed cover 90, and after the processing, the work table 3 is moved to the fixed cover 90.
To the evacuation position outside the During the machining operation, the column 101 is moved in the left and right direction by the servo motor 61, and the spindle head 11 is moved in the up and down direction by the servo motor 62. Therefore, the tool 13 rotating together with the tool spindle 1 is moved inside the fixed cover. The work table 3 is moved on a vertical plane.

Chips and coolant scattered from the processing point in the processing operation are partially dropped and collected into the concave portion 4 extending in the longitudinal direction at the center of the bed 100 in the width direction, and collected. The other part is guided into contact with the fixed cover 90 and the telescopic cover 91 and is recovered into the recess 4. In particular, the recovery port 8 provided at the entrance of the recess 4.
1 is tapered upward at a position below the work table 3 in at least the recess 4 of the bed 100, and the opening area increases as going upward. Collection port 81
Through the chip collecting device 8 installed in the recess 4.

The chips accumulated on the upper surface of the bottom plate of the chip collecting device 8 are scraped off by the scrapers 85 arranged at regular intervals on the chain 80 wound around the sprocket 82, and the chains 86 and the scraper are scraped off. The swarf is conveyed to the outside of the milling machine by the orbital movement of 85, and is collected in a collecting bucket 89 below from a discharge port provided behind the column 101.

Since the splash cover 9 is disposed inside the pair of left and right linear guideways 2 and the pair of left and right ball screws 5, chips and coolant scattered from a processing point at the time of processing are reduced. The scattering is prevented by the cover 9, so that the cover 9 does not fall and deposit on the ball screw 5 or the linear guideway 2.

That is, since the fixed cover 90 having a U-shaped cross section surrounds the processing portion 10 and the rotary table inside the ball screw 5 and the linear guideway 2, chips and coolant are removed from the processing point to the outside. To prevent scattering. The telescopic cover as the lower cover 91 disposed below the fixed cover 90 expands and contracts in accordance with the reciprocation of the work table 3 with respect to the tool spindle. Prevents chips and coolant from scattering from the space between them.

Further, since the left and right telescopic covers 97 and 98 expand and contract in accordance with the movement of the column 101 in the X-axis direction, scattering of chips and coolant in the Z-axis direction from the side of the column 101 is prevented.

The work table feed mechanism of the machine tool according to the present embodiment, which has the above-described operation, uses the pair of left and right feed screws 5 for moving the work table 3 toward and away from the tool spindle 1 by forming the space for chip collection. Since the pair of guide screws 2 disposed outside the recess 4 are further disposed outside the pair of guideways 2, the pair of feed screws 5 are further prevented from being contaminated by chips and coolant, and the work table 3 is maintained permanently in feed accuracy. It has the effect of making it possible.

In the work table feed mechanism of the machine tool according to the present embodiment, the collecting port 81 is tapered upward at a position below the work table 3 in the concave portion 4 of the base 100. Since the chip and the coolant are guided by the tapered opening wall, the chip and the coolant falling from the processing point are effectively collected.

Further, the work table feed mechanism of the machine tool according to the present embodiment includes the splash cover 9 inside each of the pair of guide ways 2 along each guide way.
Is arranged, so that there is an effect of preventing chips and coolant from scattering to the outside in the X-axis and Y-axis directions perpendicular to the Z-axis.

That is, in the work table feed mechanism of the machine tool according to the present embodiment, the fixed cover 90 having the U-shaped cross section constituting the splash cover 9 is provided with the Z axis, the X axis perpendicular to the Z axis, and the Y axis. In addition to preventing chips and coolant from scattering in the axial direction, the fixed cover 9
The telescopic cover 91, which is partially overlapped below 0, ensures that chips and coolant are scattered in the Z-axis and the X-axis and Y-axis directions perpendicular to the Z-axis according to the advancing and retreating operation of the worktable 3. This has the effect of preventing it.

Further, in the work table feed mechanism for a machine tool according to the present embodiment, one end of a cover is fixed vertically to both ends in the X-axis direction of the front surface 102 of the column 101, and the other end corresponds to the outside of the column. Bed 10
The left and right telescopic covers 97 and 98 wound in a winder 96 fixed to the brackets 95 implanted at both ends in the width direction of 0 extend and contract according to the movement of the column 101 in the X-axis direction. Therefore, there is an effect of reliably preventing chips and coolant from scattering from the side of the column toward the rear in the Z-axis direction.

In the work table feed mechanism of the machine tool according to the present embodiment, each feed screw of the pair of left and right feed screws 2 is rotated by a drive motor 50 via a speed reducer 52 arranged in series. Therefore, there is no need for a rotation transmission mechanism for rotating and driving the pair of left and right feed screws by one drive motor, so that the apparatus can be made compact and inexpensive.

The above-described embodiments are exemplifications for explanation, and the present invention is not limited to these embodiments. Those skilled in the art will recognize from the claims, the detailed description of the invention, and the drawings. Modifications and additions are possible without departing from the technical idea of the present invention.

In the above-described embodiment, an example has been described in which the pair of left and right feed screws is disposed further outside the pair of guideways disposed outside the recess, but the present invention is not limited thereto. The present invention is not limited thereto, and an embodiment in which a pair of guideways are arranged outside the pair of left and right feed screws arranged outside the concave portion, that is, the guideway is arranged at the outermost side can be adopted.

[Brief description of the drawings]

FIG. 1 is a side view showing a work table feed mechanism of a machine tool according to an embodiment of the present invention.

FIG. 2 is a plan view showing a work table feed mechanism of the machine tool according to the embodiment.

FIG. 3 is a front view showing a work table feed mechanism of the machine tool according to the embodiment.

FIG. 4 is a perspective view showing a cover mechanism in the embodiment.

FIG. 5 is a partially cutaway side view showing a work table feed mechanism of a conventional machine tool.

FIG. 6 is a plan view showing a work table feed mechanism of another conventional machine tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tool spindle 2 Guide way 3 Work table 4 Concave part 5 Feed screw 100 Bed

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuo Teramura 1-1-1, Asahi-machi, Kariya-shi, Aichi Toyota Machine Works Co., Ltd. (72) Inventor Mitsumi Taniguchi 1-1-1, Asahi-cho, Kariya-shi, Aichi, Japan Toyotako Koki Co., Ltd. (72) Inventor Koji Toyama 1-1-1 Asahi-cho, Kariya-shi, Aichi Pref.

Claims (6)

[Claims] 1. A work table feed mechanism for a machine tool in which a work table advances and retreats in a horizontal direction with respect to a tool spindle along a pair of guide ways parallel to a tool spindle, said pair of guides fixed to a base. A recess forming a space for chip recovery is formed between the ways, and a pair of left and right feed screws for moving the work table toward and away from the tool spindle are disposed outside the recess. mechanism. 2. The work table feed mechanism for a machine tool according to claim 1, wherein the pair of left and right feed screws is disposed outside the pair of guideways disposed outside the recess. 3. The collection port according to claim 1, wherein a recovery port for recovering chips and coolant falling from a processing point opens upward at least at a position below the work table in the concave portion of the base. A work table feeding mechanism for a machine tool, wherein a chip collecting device is disposed in the work table. 4. The work table feeding mechanism for a machine tool according to claim 1, wherein a splash cover is arranged inside each of the pair of guide ways along each guide way. 5. The lower cover according to claim 4, wherein the splash cover is capable of changing a cover range in the Z-axis direction as the work table advances and retreats, and is fixed above the lower cover in an upright state. A work table feed mechanism for a machine tool, comprising a cover. 6. The machine tool according to claim 1, wherein each of the pair of left and right feed screws is rotatably driven by an independent drive motor. Work table feed mechanism.