JP3089208B2 - Machine tool feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a feeder for moving a predetermined member in a predetermined direction in a machine tool such as a grinding machine.

[0002]

2. Description of the Related Art Conventionally, as a feeder for a machine tool, there has been known a feeder as shown in FIGS. In FIG. 1A, a table 102 is placed on a base 100.
Are disposed between the base 100 and the table 102. The flat guide surface 103 and the V-shaped guide surface 10 for guiding the table 102 in a predetermined direction (the direction of the arrow in the drawing).
4 are formed side by side. And the servo motor 10
The table 102 is slid in the predetermined direction by a combination of a feed screw 6 and a feed screw (not shown). In the device shown in FIG.
A pair of guide rails 107 parallel to each other is provided on the upper surface of the table 0, and a slider 108 fitted to each guide rail 107 is fixed to the lower surface of the table 102.
The two sliders 108 and the table 102 are configured to slide integrally along the guide rail 107.

Recently, in order to reduce the sliding resistance of the table 102 with respect to the base 100, FIG.
The space between the guide surfaces 103 and the guide surface 104 shown in FIG.
A roller is interposed between them, or a ball is built in the slider 108 shown in FIG.
There is also a device for rolling and guiding 02.

[0004]

The above-mentioned conventional feeder has the following problems to be solved.

[0005] It is necessary to perform high-precision machining on the guide surfaces 103 and 104, the guide rail 107 and the slider 108, and the initial cost increases accordingly.

[0006] Lubrication of the guide surface is required, which increases running costs, and the use of a lubricating oil deteriorates the working environment.

Since the guide surface is worn, it is difficult to maintain high feed accuracy for a long time.

SUMMARY OF THE INVENTION In view of such circumstances, an object of the present invention is to provide a feeder for a machine tool capable of maintaining high feed accuracy at a low cost for a long period of time.

[0009]

According to the present invention, there is provided a tool table on which tool driving means is mounted, and a tool for moving the tool table in a tool axis direction with respect to a base. A machine tool comprising: a feed unit, a cutting table on which a work holding unit is mounted, and a cut feed unit configured to move the cut table relative to the base in a cut feed direction orthogonal to a moving direction of the tool table. A plurality of leaf springs arranged in a direction parallel to each other and connecting the base and the cutting table in a state where both are separated from each other, and the table with respect to the base in a direction in which these leaf springs are bent and deformed. A feed nut fixed non-rotatably to the table, and threadedly inserted into the feed nut. And a feed motor for rotating the feed screw, and at least a part of the tool feed means is arranged in a space surrounded by the base, the cutting table, and the leaf spring. Is what it is.

In this configuration, the base and the table are always separated from each other, and the table relatively moves with respect to the base along the bending direction of the mutually parallel leaf springs. Therefore, in order to guide the table, it is not necessary to form the guide surface by high-precision machining or supply lubricating oil appropriately after the start of use as in the related art. Further, since there is no sliding between the guide surfaces, abrasion caused by the sliding does not occur, and the feeding accuracy of the table is maintained high for a long time.

The above-mentioned feeder using a leaf spring can be applied to feed in various directions. However, in consideration of the amount of elastic deformation of the leaf spring and the like, the feed required is relatively small, for example, a tool driving means. Is mounted, a tool feeding means for moving the tool table in the tool axis direction with respect to the base, a cutting table on which the work holding means is mounted, and the cutting table with respect to the base. In a machine tool provided with cutting feed means for moving the cutting table in a cutting feed direction orthogonal to the moving direction of the tool table, it is suitable for feeding the cutting table to the base in the cutting direction.

By disposing at least a part of the tool feed means in a space surrounded by a frame formed by the base, the cutting table, and the leaf spring, the space can be effectively utilized, and the machine tool can be used. The overall size can be reduced.

The base and the table only need to be separated from each other. For example, a table may be arranged below the base, and the table may be hung from the base via a leaf spring. However, in this case, it is necessary to support the base at an intermediate position in order to secure a table installation space below the base, whereas if the table is arranged above the base, the base can be placed on the ground. There is an advantage that the table can be connected to this while being installed in the table.

When the base and the table are connected in a separated state via a leaf spring as described above, the table may vibrate while elastically deforming the leaf spring. If a vibration damping means for damping the vibration of the table is provided in between, it is possible to prevent the machining accuracy from being adversely affected by the vibration.

[0015]

1 to 4 show an embodiment of the present invention.
It will be described based on. In this embodiment, an inner peripheral grinding machine for grinding the inner peripheral surface of the work W is exemplified. However, the feeder according to the present invention is applied to various machine tools such as a cylindrical grinding machine and a centerless grinding machine. Is possible.

The illustrated machine tool has a base (base) 10.
The whetstone operating unit 12 and the work operating unit 14 are provided on the base 10.

As shown in FIG. 1A, the grindstone operation unit 12
Is a fixed table 16 and a grindstone table (tool table) 18
It has. The fixed table 16 is fixed on the base 10, and the grindstone table 18 is mounted on the fixed table 16 so as to be slidable in the Z-axis direction in FIGS. 2 and 3 (the depth direction in FIG. 1A). ing.

On the grindstone table 18, a wheel head (tool driving means) 20 is provided. The wheel head 20 rotatably holds a grinding wheel shaft 21 parallel to the Z-axis, and has a built-in motor for rotating the grinding wheel shaft 21. A grinding wheel 22 is attached to a tip of the grinding wheel shaft 21. .

A grindstone feed motor (tool feed means) 26 is provided on the base 10 via a bracket 24 in front of the grindstone table 18 (left side in FIG. 2). A feed screw 28 extending parallel to the Z-axis is connected to an output shaft of the grinding wheel feed motor 26, and a feeding nut 30 is fixed to a lower surface of the grinding wheel table 18,
The feed screw 28 is threadedly inserted into the feed nut 30. Accordingly, when the feed screw 28 is driven to rotate by the operation of the grinding wheel feed motor 26, the grinding wheel table 18 is rotated.
The wheel head 20 is integrally fed and driven in the Z-axis direction.

The work operation section 14 includes a fixed base 32 and a cutting table 34. The fixing table 32 is fixed on the base 10, and the cutting table 34 is disposed above the fixing table 32 in a state parallel to the fixing table 32.
The left and right ends (upper and lower ends in FIG. 3) of the fixing table 32 and the cutting table 34 are paired with a pair of leaf springs 36.
Are connected via

More specifically, the lower ends of the two leaf springs 36 are fixed to the left and right end surfaces of the fixing table 32 by fixing members 38 such as bolts, and the upper end portions of the two leaf springs 36 are fixed to the right and left ends of the grinding stone table 34 by the fixing members 38. Is fixed to the part. Therefore,
The fixed table 32, the cutting table 34, and the double leaf springs 3
6, a substantially rectangular frame is formed.
The cutting table 34 can be relatively moved with respect to the fixed base 32 in the bending direction (the direction in which the leaf springs 36 are arranged; the X-axis direction in FIG. 3) with the bending elastic deformation of FIG. ) (B). Then, at least a part (most part in the illustrated example) of the grinding wheel feed motor 26 is accommodated in a space surrounded by the frame.

On the cutting table 34, a spindle 42 is provided.
There is provided a work holding device 40 that rotatably supports. The main shaft 42 extends in parallel with the Z-axis direction. A chuck 44 for detachably holding the work W is provided at a front end (right end in FIGS. 2 and 3), and a rear end (FIGS. 2 and 3). A pulley 46 is fixed to the left end.
A spindle motor 50 is fixed to the side of the work holding device 40 via a bracket 48, and a pulley 52 is fixed to an output shaft 51 of the spindle motor 50.
A belt 54 is stretched between the pulley 2 and the pulley 46. Accordingly, when the spindle motor 50 is operated, the driving force is transmitted to the spindle 42 via the belt 54, and the work W held at the front end of the spindle 42 is driven to rotate about its central axis. I have.

The position of the work holding device 40 is such that the grindstone 22 on the wheel head 20 side can be inserted into the work W held by the chuck 44 in an initial state in which the leaf spring 36 is not bent and deformed. It is set in such a position.

A bracket 5 is provided on the side of the base 10.
6 is fixed. The bracket 56 extends upward to a position higher than the cutting table 34, and a cut feed motor (cut feed means) 58 is fixed to the upper end of the bracket 56. This cutting feed motor 58
The output shaft is connected to a feed screw 60, which extends parallel to the X-axis direction. On the other hand, a feed nut 64 is non-rotatably fixed on the cutting table 34 via a bracket 62, and the feed screw 60 is screwed into the feed nut 64. Accordingly, when the feed screw 60 is rotationally driven by the operation of the cut feed motor 58, the cut table 34 is driven to be fed in the X-axis direction while the plate spring 36 is being deformed.

As shown in FIG. 4, the fixed base 32 has
The head-side end of a hydraulic cylinder 70 is rotatably connected via a pin 68 in the Z-axis direction (the depth direction in FIG. 4), and the rod end of the hydraulic cylinder 70 is connected via a pin 72 parallel to the pin 68. It is connected to the cutting table 34. The head-side chamber and the rod-side chamber of the hydraulic cylinder 70 are connected to a tank 76 via a throttle valve 74 with a check valve. That is, the fixed base 3 is controlled by the hydraulic cylinder 70 and the throttle valve 74 with a check valve.
Vibration damping means for damping the horizontal vibration of the cutting table 34 with respect to 2 is provided.

Next, an example of a procedure of the inner surface grinding of the work W by this apparatus will be described.

The entire grinding machine is set to an initial state.
Specifically, the cutting table 34 is positioned at a position where the leaf spring 36 does not bend and deform at all, and
8 is retracted to the rearmost position.

The motor built in the wheel head 20 is operated to rotate the grindstone shaft 21, and the spindle motor 50 is operated to rotate the spindle 42 and the work W.

The grindstone feed motor 26 is operated to advance the grindstone table 18 and the wheel head 20 integrally along the Z axis, and the grindstone table 18 is stopped at the position where the grindstone 22 is inserted into the work W.

The cutting feed motor 58 is operated, the cutting table 34 is transferred in the X-axis direction while the leaf spring 36 is forcibly elastically deformed, and the work W is gradually moved in the same direction. Thereby, the grindstone 22 is formed on the inner peripheral surface of the workpiece W.
Starts to contact, and the cutting by the grindstone 22 is started.

When the cut amount reaches the target amount, the cut motor 58 is temporarily stopped and then reversely rotated to return the cut table 34 to its original position, that is, a position where both leaf springs 36 are not deformed.

Wheel Head 20 and Spindle Motor 5
0 is stopped, and the grindstone table 18 is retracted to return to the initial state.

According to such a device, the following effects can be obtained.

A) Since the cutting table 34 is not guided by sliding between the guide surfaces as in the prior art,
High-precision machining for forming the guide surface and supply of lubricating oil to the guide surface are unnecessary, and the initial cost and running cost are remarkably reduced accordingly.

B) Since there is no abrasion due to sliding between the guide surfaces, high feed accuracy can be maintained for a long period of time.

C) Since the hydraulic cylinder 70 is interposed between the base 10 and the cutting table 34 as a damper, even if the cutting table 34 is supported by the leaf spring 36, the vibration of the cutting table 34 is prevented. The vibration can be effectively suppressed, and the processing accuracy can be prevented from deteriorating due to the vibration.

D) The grinding wheel feed motor 26 is placed in a space surrounded by the base 10, the cutting table 34, and the two leaf springs 36.
Of the entire machine tool, as compared with the case where the grinding wheel feed motor 26 is provided on the opposite side (the right side in FIGS. 2 and 3) of the cutting table 34 as in the related art.
The installation space in the axial direction can be greatly reduced.

The embodiments of the present invention are not limited to those described above, and the following embodiments can be taken as examples.

(1) In the above embodiment, the cutting table 34 is arranged above the base 10. However, in the present invention, the table is arranged below the base, and this table is separated from the base by a leaf spring. You may make it hang through. However, in this case, in order to secure a space for disposing the table below the base, means for supporting the base at an intermediate height position is required. Is advantageous in that the table can be connected to the base while the base is installed on the ground.

(2) The feeder according to the present invention can be widely applied not only to the above-mentioned cut feed but also to a feed in which a required feed amount is relatively small. Is possible.

(3) In the present invention, the number of leaf springs may be plural. For example, a reinforcing leaf spring may be additionally provided between both leaf springs 36 shown in FIG.

[0042]

As described above, according to the present invention, with the base and the table separated from each other, the two are connected by a plurality of parallel plate springs, and the table is moved in a direction in which these plate springs are flexed and deformed. Since it is designed to move relative to the base, there is no need to form a guide surface by high-precision machining as in the past, or to supply lubricating oil appropriately after starting use. The table can be driven at low cost without deteriorating the working environment.
In addition, since there is no sliding between the guide surfaces as in the conventional feeder, there is no abrasion caused by such sliding, so that there is an effect that high feed accuracy can be maintained for a long time.

Moreover, a tool table on which the tool driving means is mounted, a tool feed means for moving the tool table relative to the base in the tool axis direction, a cutting table on which the work holding means is mounted, A cutting tool that moves the table with respect to the base in a cutting feed direction orthogonal to the moving direction of the tool table, wherein the base and the cutting table are connected by the leaf spring; And at least a part of the tool feed means is arranged in a space surrounded by the cutting table and the leaf spring, so that the entire machine tool can be compactly assembled by effectively utilizing the space. is there.

Here, if the table is arranged above the base, the structure can be simplified more than that of hanging the table below the base via a leaf spring, and the initial cost can be further reduced. Can be.

If a vibration damping means for damping the vibration of the table is provided between the base and the table, the effect that the machining accuracy is adversely affected by the vibration can be effectively suppressed. is there.

[Brief description of the drawings]

1A is a cross-sectional view taken along line AA of FIG. 2, and FIG.
FIG. 7 is a sectional view taken along line BB of FIG.

FIG. 2 is a partial cross-sectional side view of the internal grinding machine according to the embodiment of the present invention.

FIG. 3 is a plan view of the internal grinding machine.

FIG. 4 is a view taken in the direction of the arrow C in FIG. 2;

FIGS. 5A and 5B are perspective views showing an example of a conventional feeder for a machine tool.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Base 12 Grinding stone operation part 14 Work operation part 18 Grinding stone table (tool table) 20 Wheel head (tool driving means) 22 Grinding stone 26 Grinding stone feed motor (Tool feeding means) 34 Cutting table 36 Leaf spring 40 Work holding device 50 Spindle motor 58 Cut feed motor 70 Hydraulic cylinder (vibration suppression means) 74 Throttle valve with check valve (vibration suppression means) 86 Drive transmission cylinder (drive transmission means) 88 Drive transmission shaft (drive transmission means)

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-61-111868 (JP, A) JP-A-61-142040 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23Q 5/22 B23Q 1/34

Claims (3)

(57) [Claims] 1. A tool table on which tool driving means is mounted.
The tool table with respect to the base in the tool axis direction.
The tool feed means to move and the work holding means are placed
Cut table and this cut table as the base
The cutting feed perpendicular to the tool table movement direction
Machine tool provided with cutting feed means for moving in the cutting direction
In, are Haise in a direction parallel to each other, and the base and cut table and a plurality of leaf springs connecting in a state where both are spaced apart, to the table to the base in a direction to deform the deflection of these leaf springs A feed nut fixed non-rotatably to the table, a feed screw threadedly inserted into the feed nut, and a rotary drive for the feed screw. possess a feed motor, the base and the cuts table
The tool feed means in a space surrounded by the tool and the leaf spring.
, At least a part of which is arranged . 2. A feeder for a machine tool according to claim 1, wherein said table is arranged above said base. 3. The feeder for a machine tool according to claim 1, wherein a vibration damping means for damping vibration of the table is provided between the base and the table. .