JP2003231014A - Machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machine tool capable of performing various machining such as grinding and cutting. <P>SOLUTION: A mold for molding a light leading plate provided with a reflection groove like complicated curve is held by a chuck 31 provided in an upper part of a table unit 32. When cutting a molded face of the reflection groove, a cutting edge 26 is turned on a vertical axial line by a motor 3. The direction of the cutting edge 26 is changed by the turn. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machine tool suitable for cutting a die for molding a light guide plate used in a liquid crystal device, for example.

[0002]

2. Description of the Related Art Generally, a light guide plate disposed on the back surface of a liquid crystal panel of a liquid crystal device provided in a notebook computer or the like reflects light generated from a light source and faces the liquid crystal panel from the back surface side to the front. A light reflection groove is provided for irradiating the light as parallel light. Further, this type of light guide plate is formed by using a die having a reflection groove forming surface cut on the inner surface.

[0003]

When the light source is a plurality of point light sources such as light emitting diodes, the generated light has unevenness due to the intensity of the light. In order to uniformly irradiate the entire liquid crystal panel with such uneven light, the reflective groove of the light guide plate must be formed into a complicated curved shape corresponding to the unevenness.

Therefore, when such a complicated curved reflection groove is cut and formed on the reflection groove forming surface of the light guide plate forming die, the cutting edge of the machine tool always faces the tangential direction of the curve. It was necessary to cut in this way.

The present invention has been made to meet such a conventional demand. The purpose is to make sure that the cutting edge of the cutting blade always faces the tangential direction of the curve when cutting the reflection groove forming surface of the mold for forming a light guide plate with a complicated curved reflection groove. Another object of the present invention is to provide a machine tool capable of various kinds of processing such as continuous cutting.

[0006]

In order to achieve the above object, according to the invention as set forth in claim 1, a table for supporting a work and a table arranged on a vertical axis are lifted and lowered by a lifting drive means and rotated. A rotary shaft that is rotated about a vertical axis by a dynamic drive means, a cutting blade attached to the rotary shaft, and the table causes relative reciprocating motion with respect to the cutting blade along a first horizontal axis. And a second horizontal movement driving means for causing the table to make relative reciprocating motion with respect to the cutting blade along a second horizontal axis orthogonal to the first horizontal axis. And a means for changing the direction of the cutting blade by rotating the rotation shaft based on the drive of the rotation drive means.

Therefore, when the cutting blade is lowered by the elevating and lowering drive means, the cutting blade comes into contact with the upper surface of the work. In this state, the work is cut by moving the work relative to the cutting blade by the first horizontal drive means and the second horizontal drive means. At this time, since the cutting blade is rotated on the vertical axis by the rotation of the rotating shaft,
The cutting edge of the cutting blade can be oriented in the tangential direction of the curve to be cut. Therefore, it is convenient for cutting the mold of the light guide plate, for example.

A second aspect of the present invention is characterized in that, in the machine tool of the first aspect, the rotary shaft can be relocated from the position on the vertical axis to the position on the horizontal axis.

Therefore, since it is easy to change the angle of the cutting blade in the vertical direction, for example, the side surface of the work can be machined, and the machining with a higher degree of freedom can be realized. According to a third aspect of the invention, in the machine tool according to the second aspect, the table is provided on a bed, and a column is provided on the bed, and a support body that supports the rotating shaft is provided on the column. The gist of the present invention is to provide a supporting portion that is detachably fixed and to arrange the rotating shaft from a position on the vertical axis to a position on the horizontal axis.

Therefore, the first horizontal drive means and the second horizontal drive means cause relative movement between the table and the column supporting the work, and the work is cut.

According to a fourth aspect of the present invention, in the machine tool according to any one of the first to third aspects, a face plate is fixed to one end of the rotary shaft, and the face plate is detachable from the face plate. The gist is that the cutting blade is fixed to another fixed face plate.

Therefore, since the fixed relationship between the rotary shaft and the cutting blade is surface contact between both face plates, the rotary shaft and the cutting blade are firmly fixed to each other, and high assembly precision between them can be maintained. .

In a fifth aspect of the invention, in the machine tool according to the fourth aspect, the cutting blade is fixed to the face plate so as to be extended in the axial direction of the rotating shaft. Therefore, with the rotation of the rotary shaft, the cutting blade is integrally rotated on substantially the same axis, and the orientation of the cutting blade can be changed with high accuracy.

In a sixth aspect of the invention, in the machine tool according to the fourth aspect, the cutting blade is fixed to the face plate so as to intersect with the axial direction of the rotating shaft.
Therefore, by rotating the rotating shaft, the cutting edge of the cutting blade can be directed in an arbitrary radial direction centered on the axis of the rotating shaft. Therefore, the required processing can be performed on the processing surface other than the horizontal surface.

According to a seventh aspect of the present invention, in the machine tool according to any one of the fourth to sixth aspects, the rotary shaft is replaced with a rotary grindstone. That is the summary.

Therefore, instead of the cutting work, the grinding work with the rotary grindstone can be performed. According to an eighth aspect of the invention, in the machine tool according to the seventh aspect, the column is provided with a dressing device for dressing the rotary grindstone.

Therefore, the rotary grindstone can be dressed, and high-precision grinding can be maintained. According to a ninth aspect of the invention, in the machine tool according to any one of the first to eighth aspects, the table is configured to be rotated about a vertical axis by the drive of the rotation drive means. Is the gist.

Therefore, if the table is rotated at high speed,
Since the workpiece can be processed point-symmetrically, it is suitable for cutting the surface of a convex lens made of glass, for example. Further, if the table is rotated at a low speed, indexing or the like becomes possible.

According to a tenth aspect of the invention, in the machine tool according to the ninth aspect, the rotation driving means includes a high-speed rotation mechanism for rotating the table at a high speed, and an indexing mechanism for rotating the table at a low speed. , And a switching mechanism for operating either one of the two mechanisms.

Therefore, by the operation of the switching mechanism, either the high speed rotation mechanism or the indexing mechanism is selected, and the required machining mode can be obtained. According to an eleventh aspect of the present invention, in the machine tool according to the tenth aspect, the switching mechanism includes a clutch mechanism, and either the high speed rotation mechanism or the indexing mechanism is activated by releasing or connecting the clutch. The summary is what you did.

Therefore, the switching between the high-speed rotation mechanism of the table and the indexing mechanism is reliably performed by the operation of the clutch. A twelfth aspect of the invention is summarized as the machine tool according to the eleventh aspect, in which the clutch mechanism includes a cylindrical slope clutch formed on a shaft that supports the turntable.

Therefore, the clutch mechanism is arranged on the axis of the turntable. Therefore, the clutch mechanism can be made compact. According to a thirteenth aspect of the invention, in the machine tool according to any one of the tenth to twelfth aspects, the high-speed rotation mechanism and the indexing mechanism each include a drive motor, and the switching mechanism switches the driving motor. The gist is to select a different power transmission path according to the operation.

Therefore, since the power transmission paths of the high-speed rotation mechanism and the indexing mechanism are different, malfunction is prevented, and the turntable can be rotated at a required number of rotations.
According to a fourteenth aspect of the present invention, in the machine tool according to the thirteenth aspect, the motor axis of the drive motor and the axis of the turntable are parallel to each other.

Therefore, it suffices to hang a belt or the like between the shaft of the turntable and the motor shaft of the drive motor, and rotation can be smoothly transmitted with a simple structure.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.

First, the configuration of the machine tool will be described. As shown in FIGS. 1 to 3, in the machine tool 10, a table unit 32 is fixed to the upper part of the machine base 11, and a chuck 31 for holding the work 30 is provided on the upper surface thereof.

A gate-shaped column 12 is supported on the machine base 11 so as to be movable in the X (first horizontal axis) direction via a pair of guide rails 14, and a motor as a first horizontal movement drive means. 13 is moved in the same direction via a ball screw (not shown).

A support plate 18 is provided on the front surface of the upper portion of the column 12 through a pair of guide rails 17 (Y (second horizontal axis)).
It is movably supported in the same direction, and is moved in the same direction by a motor 15 as a second horizontal movement drive means via a ball screw 16.

A quill 22 as a support portion is supported on the front surface of the support plate 18 via a pair of guide rails 19 so as to be movable in the Z direction. A motor 20 is provided on the upper end of the support plate 18, and the ball screw 2 is driven by the motor 20.
The quill 22 is moved up and down in the Z (vertical axis) direction via the 1.

On the front surface of the quill 22, an elevating / lowering body 23 as a supporting body having a motor 33 as a rotation driving means as shown in FIG. 6 is detachably and repositionably attached by a bolt 23a. . A face plate 24a is fixedly mounted on the lower end of the output shaft 24 as a rotating shaft located on the vertical axis of the motor 33. A face plate 25 integrated with the cutting blade 26 is detachably attached to the face plate 24a with a bolt 25a. In this case, the cutting blade 26 is positioned so as to extend vertically downward on a vertical axis passing through the output shaft 24 of the motor 33.

Therefore, the cutting blade 26 is moved relative to the table unit 32 in the X and Y directions by driving the motors 13 and 15. The lifting / lowering body 23 is replaced with another lifting / lowering body 123, 223 shown in FIGS. 7 and 8 by attaching and detaching the bolts 23a. That is, in the lifting / lowering body 123 shown in FIG. 7, the output shaft 124 of the motor 133 is located on the horizontal axis, and the cutting blade 126 is attached to the face plate 124a at the tip of the output shaft 124 as the rotation shaft by the bolt 126a on its side surface. It is fixed. Therefore, the cutting blade 126 is fixed so as to intersect the axis of the output shaft 124.

The lift 223 shown in FIG. 8 is equipped with a motor 63 that continuously rotates at high speed, and its output shaft 48 is located on the horizontal axis. A rotary grindstone 49 is fixed to the tip of the output shaft 48.

On the inner surface of one leg of the column 12, a rotary dresser 29 is attached to the tip of the output shaft 28 of the motor 27.
A dressing device 51 provided with is projected. Next, the configuration of the table unit of the machine tool will be described.

As shown in FIGS. 4 and 5, on one side upper surface of the table unit case 43, the turntable 42 to which the chuck 31 is attached is provided with the projection 5 on the outer periphery thereof.
In FIG. 2, the groove 53 is rotatably supported by static pressure via a lubricating oil. The rotation table of the turntable 42 extends in the vertical direction.

In the table unit case 43, a high-speed rotation motor 34 for performing high-speed continuous rotation and an index rotation motor 35 for performing index rotation and low-speed continuous rotation.
Are fixed and their motor shafts extend vertically.

The pulley 42b on the outer periphery of the upper end of the shaft portion 42a of the turntable 42 and the pulley 38 of the output shaft of the high-speed rotation motor 34 are connected via a timing belt 36. This high-speed rotation motor 34, pulley 38,
The timing belt 36 and the like constitute a high speed rotation mechanism.

A female screw 55 is formed on the upper end of the center hole 42c of the turntable 42. A rod-shaped clutch member 40A having a wrench hole 41 in an upper portion is inserted into the center hole 42c, and a male screw 54 to be screwed into the female screw 55 is formed at an upper end portion thereof. Therefore, by rotating the clutch member 40A in the wrench hole 41 using a wrench (not shown), the screw action of the female screw 55 and the male screw 54 causes the clutch member 40A to move up and down along its axis. .

The slope portion 5 which constitutes a cylindrical slope clutch corresponding to the lower end of the shaft portion 42a of the turntable 42 and the lower end of the clutch member 40A so as to be able to contact and separate from each other.
6, 57 are formed. The slope mechanism 56, 57, the female screw 55, and the male screw 54 constitute the clutch mechanism 40. Pulley 4 at the lower end of clutch member 40A
0a and a pulley 39 at the lower end of the output shaft of the indexing rotation motor 35, a timing belt 37 is hung.

This indexing rotation motor 35 and pulley 3
9, the timing belt 37, etc. constitute an indexing mechanism. It should be noted that the pulley 40a and the timing belt 37 are arranged so that the vertical movement of the clutch member 40A is allowed.
There is a possibility that vertical slippage may occur between and.

Then, when the clutch member 40A is raised and the sloped portions 56 and 57 are joined,
When the indexing rotation motor 35 is rotated, the turntable 42 is rotated via the timing belt 37 and the clutch member 40A. In this case, the low-speed continuous rotation or the intermittent rotation is selected for the indexing rotation motor 35, the turntable 42 is similarly continuously rotated at the low speed during the low-speed continuous rotation, and the turntable 42 is indexed during the intermittent rotation. Is rotated.

Further, as shown in FIG. 10, the high-speed rotation motor 34 and the index rotation motor 35 are connected to the control unit 6
The switch 62 is controlled via 1 to activate one of the motors. That is, the switch 62
Either the high-speed rotation motor 34 or the indexing rotation motor 35 is rotated with the switching operation of
One power transmission path is selected.

Further, by another switching operation of the switch 62, the low speed continuous rotation or the low speed continuous rotation of the indexing rotation motor 35 is selected. A switching mechanism is configured by the control device 61, the switch 62, and the like.

Next, the operation of the machine tool of the first embodiment configured as described above will be described. First, a case where a curved groove is formed on the upper surface of the work 30 by cutting will be described.

As shown in FIGS. 1 to 3, the lifting body 23 is attached to the quill 22, and the cutting blade 26 faces vertically downward. In this state, the work 30 is placed on the chuck 31 on the table unit 32. Then, the column 13 is moved in the X direction by the motor 13 and the support plate 18 is moved in the Y direction by the motor 15, so that the cutting blade 26 is adjusted to a desired position on the work 30.

By moving the quill 22 in the Z direction by the motor 20, the cutting blade 26 attached to the tip of the lifting body 23 is brought into contact with the upper surface of the work 30. In this state, the upper surface of the work 30 is cut by moving the column 12 in the X direction and the support plate 18 in the Y direction by the motor 13 and the motor 15, respectively.

That is, as shown in FIG. 9, the cutting blade 26 moves relative to the work 30 in the X direction and also in the Y direction, so that the upper surface of the work 30 is curved by the cutting edge of the cutting blade 26. Is cut into a shape. At this time, the direction of the cutting edge of the cutting blade 26 is changed by the rotation of the motor 33 so that the cutting direction by the cutting edge of the cutting blade 26 always faces the tangential direction of the curved line.

By this cutting, a curved groove 50 is formed on the upper surface of the work 30. In FIG. 9, a plurality of cutting blades 26 are drawn along the groove 50 for easy understanding, but only one cutting blade 26 actually appears.

Next, the case where a curved groove is formed on the side surface of the work 30 by cutting will be described. In this case, the lift 23 is replaced with the lift 123 shown in FIG.

Then, the direction of the cutting blade 126 is adjusted by the motor 133 so that the cutting blade 126 faces the Y direction (the side surface of the work 30 to be cut). In this state, relative movement in the Z direction and the Y direction is caused between the work 30 and the cutting blade 126, whereby the work 3
A curved groove is formed on the side surface of 0 by cutting.

The cutting blade 126 is placed at a position that extends in the direction orthogonal to the output shaft 124 (vertically downward direction).
If the output shaft 124 is rotated by 33, the same cutting as in FIG. 6 can be performed.

Next, the work 30 on the turntable 42.
A case will be described where cutting is performed while rotating. In this case, the clutch member 40A is lowered by a wrench to bring the sloped portion 56 and the sloped portion 57 into a separated state.

In the machine tool 10 described above, the lifting / lowering body 23 of FIG. 6 is set, and as shown in FIGS. 4 and 5, the chuck 31 fixed on the turntable 42 causes the surface of the work (not shown), for example, as a work. A spherical convex lens is supported. By operating the switch 62, the high-speed rotation motor 34 is rotated, and accordingly, the turntable 42 is continuously rotated at high speed, that is, the convex lens is continuously rotated at high speed.

With the convex lens being rotated, the cutting blade 26 is contact-moved so as to trace the surface of the convex lens in the X or Y direction and the Z direction, whereby the surface of the convex lens is cut. At this time, the orientation of the cutting edge of the cutting blade 26 is changed as necessary.

In some cases, for example, it may be desired to form radial linear grooves by cutting at desired angular intervals from the center of the work to the outer peripheral direction. In such a case, the wrench raises the clutch member 40A to bring the slope portion 56 and the slope portion 57 into surface contact. By operating the switch 62 in this state, only the indexing rotation motor 35 is rotated to index the work 30 together with the turntable 42. At this time, the high-speed rotation motor 34 is
As the indexing rotation motor 35 rotates, the rotation only occurs.

Then, when the cutting blade 26 is moved in the required X and Y directions when the indexing is stopped, for example, a plurality of grooves extending in the radial direction can be cut. If the lifting body 223 shown in FIG. 8 is set on the quill 22, the rotary grindstone
It is possible to perform a grinding process using No. 9.

The dressing of the rotary grindstone 49 is performed by using the dressing device 51 provided in the column 12. That is, the rotating grindstone 49 is dressed by moving the rotating grindstone 49 in the X, Y, and Z directions to contact the rotating dresser rotated by the motor 27.

According to the first embodiment detailed above, the following effects are exhibited. -Work 3 while changing the direction of the cutting edge of the cutting blade 26
Since 0 cutting can be performed, it is convenient for cutting the mold of the light guide plate, for example.

By using the lifting body 123 shown in FIG. 7,
Since it becomes easy to process the side surface of the work 30 and change the angle of the cutting blade 126, it is possible to perform cutting processing with a higher degree of freedom. Since the cutting blades 26 and the like can be replaced or the mounting direction of the cutting blades 26 can be easily changed, maintenance is easy and cutting processing with a higher degree of freedom can be performed.

Since it is possible to perform various processing such as cutting and grinding with one machine tool 10, it is economical and rational. When the lifting body 223 shown in FIG. 8 is used, the grinding process can be performed easily and the rotary grindstone 49 can be dressed.

Since the work 30 can be processed point-symmetrically, it is suitable for cutting the surface of a convex lens made of glass, for example. Since the work 30 can be processed at desired intervals, it is convenient, for example, to form radial grooves on the surface of the work 30 by cutting.

The first embodiment can be modified and constructed as follows. The column 12 may be a normal tower type instead of the gate type. By doing so, the machine tool 10 can be downsized and the installation space can be reduced.

The turntable 42 is not lubrication oil,
It may be supported by static pressure by air. By doing so, the machine tool 10 is less likely to get dirty. -The cutting blade 26 may be a drill. In this case, the high-speed rotation motor 63 is used as the motor as the rotation driving means of the lifting body 23. By doing so, the machine tool 10 can be used as a drilling machine.

[0063]

As described above in detail, according to the present invention, when the reflecting groove forming surface of the mold for forming the light guide plate having the complicated curved reflecting groove is cut, the cutting edge of the cutting blade is There is an effect that it is possible to provide a machine tool that can perform various kinds of machining in addition to being able to perform continuous cutting work by always facing the tangential direction of a curved line.

[Brief description of drawings]

1] Side view showing the entire machine tool

[Fig. 2] Side view showing the entire machine tool

FIG. 3 is a front view showing the entire machine tool.

FIG. 4 is a front view of the table unit.

FIG. 5 is a side sectional view of the table unit.

FIG. 6 is a side view of the cutting attachment.

FIG. 7: Side view of attachment for cutting

FIG. 8 is a side view of a grinding attachment.

FIG. 9 is a front view showing the movement of the cutting blade.

FIG. 10 is an explanatory diagram showing a turntable control mechanism.

[Explanation of symbols]

10 ... Machine tool, 11 ... Machine stand, 12 ... Column, 13 ... Motor as first horizontal movement drive means, 14, 17, 1
9 ... Guide rails, 15 ... Motors as second horizontal movement drive means, 18 ... Support plates, 20 ... Motors as elevation drive means, 22 ... Quills as support portions, 23, 12
3, 223 ... Elevating body as support, 24 ... Output shaft as rotating shaft, 25 ... Face plate, 26, 126 ... Cutting blade, 30
... Work, 31 ... Chuck, 32 ... Table unit,
33, 63, 133 ... Motor as rotation driving means, 3
4 ... Motor as high speed rotation mechanism, 35 ... Motor as indexing mechanism, 40 ... Clutch mechanism, 40A ... Clutch member, 42 ... Turntable, 42a ... Shaft part, 42b
... pulley, 42c ... center hole, 43 ... table unit case, 49 ... rotating grindstone, 51 ... dressing device, 56, 57
... Slope as clutch mechanism, 61 ... Control device as switching mechanism, 62 ... Switch as switching mechanism, X ... First horizontal axis, Y ... Second horizontal axis, Z ... Vertical axis

Claims (14)

[Claims] 1. A table for supporting a work, a rotary shaft which is arranged on a vertical axis and which is lifted and lowered by an elevating and lowering drive means and which is rotated by the rotary drive means about the vertical axis. A cutting blade attached to the shaft; a first horizontal movement drive means for causing the table to make a relative reciprocating motion relative to the cutting blade along a first horizontal axis; and the table with respect to the cutting blade. A second horizontal movement drive means configured to cause relative reciprocal movement along a second horizontal axis orthogonal to the first horizontal axis, and the rotation axis rotates based on the drive of the rotation drive means. A machine tool characterized in that the direction of the cutting blade is changed by being moved. 2. The machine tool according to claim 1, wherein the rotary shaft can be relocated from a position on the vertical axis to a position on the horizontal axis. 3. The table is provided on a bed, a column is provided on the bed, and a support portion for detachably fixing a support body that supports the rotating shaft is provided on the column. The machine tool according to claim 2, wherein the rotating shaft is configured to be relocated from a position on the vertical axis to a position on the horizontal axis. 4. The face plate is fixed to one end of the rotary shaft, and the cutting blade is fixed to another face plate detachably fixed to the face plate. A machine tool according to item 1. 5. The cutting blade is fixed to the face plate so as to be extended in the axial direction of the rotating shaft.
Machine tool described in. 6. The machine tool according to claim 4, wherein the cutting blade is fixed to the face plate so as to intersect the axial direction of the rotating shaft. 7. The rotating shaft is configured to be replaced with a rotating shaft having a rotary grindstone.
The machine tool according to claim 6. 8. The machine tool according to claim 7, wherein the column is provided with a dressing device for dressing a rotary grindstone. 9. The machine tool according to claim 1, wherein the table is configured to be rotated about a vertical axis by being driven by a rotation drive unit. 10. The rotation driving means includes a high-speed rotation mechanism for rotating the table at a high speed, an indexing mechanism for rotating the table at a low speed, and a switching mechanism for operating one of the two mechanisms. The machine tool according to claim 9, further comprising: 11. The tool according to claim 10, wherein the switching mechanism includes a clutch mechanism, and either the high speed rotation mechanism or the indexing mechanism is activated by releasing or connecting the clutch. machine. 12. The machine tool according to claim 11, wherein the clutch mechanism includes a cylindrical slope clutch formed on a shaft that supports the turntable. 13. The high speed rotation mechanism and the indexing mechanism each include a drive motor, and the switching mechanism selects different power transmission system paths according to the switching operation. The machine tool according to any one of 12. 14. The machine tool according to claim 13, wherein a motor axis line of the drive motor and a turntable axis line are parallel to each other.