JPH08229758A - Machining device and machining method by machining device - Google Patents

Abstract

PURPOSE: To realize quicker machining while maintaining high machining accuracy by reducing a lift stroke of a tool holding part. CONSTITUTION: In a machining device, a workpiece mounted on a table 28 and a tool held to a tool holding part are relatively moved to advance machining. The table 28 is constituted liftably against a head 10, to provide hydraulic cylinders 46 to 48 or the like of lifting this table 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining apparatus for machining a workpiece placed on a table while moving the tool relative to the workpiece, and a machining method by the machining apparatus.

[0002]

2. Description of the Related Art FIGS. 7A and 7B show an example of a conventional processing apparatus. In the figure, a table 90 is fixed to a bed (not shown), and a work 92 is placed on the table 90. A beam 94 extending horizontally is provided above the table 90, and a slider 96 is provided slidably along the beam 94. This slider 9
A ram (tool holding portion) 97 is held by 6 so as to be movable up and down, and a tool 98 is held at the lower end of the main shaft of the ram 97.

In this conventional apparatus, the tool 98 is horizontally moved with respect to the work 92 by the sliding movement of the slider 96 and the ram 97 (or the horizontal movement of the table 90) along the beam 94, and this tool 98 is also used. The surface of the work 92 is processed while itself moving up and down.

[0004]

In the above apparatus, since the height position of the table 90 is fixed and the machining is advanced by raising and lowering the ram 97, for example, as shown in FIGS. When processing a large work 92, in order to process the entire upper surface of each step, the elevating stroke Sr of the ram 97 must be set to be equal to or higher than the height dimension from the lowermost step to the uppermost step of the work 92.

Thus, the lifting stroke Sr of the ram 97 is
In order to set the ram 97 large, the length of the ram 97 itself must be increased. When the ram 97 is lengthened in this way, the ram 97 is moved to the lowest position as shown by the solid line in FIG. 7B, for example. In the lowered state, the bending rigidity of the ram 97 in the horizontal direction becomes extremely low. In this state, the ram 97 is easily bent and deformed when abrupt acceleration / deceleration is performed or when a large cutting force acts on the ram 97, which may significantly reduce the machining accuracy. At present, there is no choice but to limit the speed remarkably, which makes high-efficiency machining impossible.

In view of such circumstances, it is an object of the present invention to provide a processing apparatus and a method of using the processing apparatus which can realize more rapid processing while maintaining high processing accuracy.

[0007]

As a means for solving the above problems, the present invention comprises a tool holding portion for holding a tool and a table on which a work is placed, and the tool holding for the work. In a processing apparatus configured to perform processing of this work while moving parts relative to each other, the table is configured to be movable up and down, and table lifting drive means for driving the table up and down is provided. 1).

In this apparatus, it is more preferable that the tool holding portion is configured to be able to move up and down and that a tool raising / lowering drive means for driving the tool holding portion to move up and down is provided.

In this case, it is more preferable that the lowermost position of the tool held by the tool holding portion and the uppermost position of the table are set at substantially the same height position (claim 3).
Further, it is more preferable to include a table locking means for locking the table at a plurality of vertically different locking positions (claim 4).

When the table holding means is provided, it is preferable that the lifting stroke of the tool holding portion is equal to or more than the vertical distance between the locking positions and smaller than the entire lifting stroke of the table (claim 5). .

As the table locking means, specifically, a locked member extending vertically is connected to the table,
The locked member is provided with a locked portion at a plurality of vertically different positions, and is moved between a locked position for supporting the locked portion from below and a retracted position for retracting from the locked portion. A device provided with a possible locking member is preferable (Claim 6).

More specifically, the bed is provided with vertical guide holes, and the shape of the locked member is set to a shape that can be fitted into the guide hole. While the substantially horizontal engaged hole is provided at the position, the shape of the engaging member is set so that each engaged hole can be loosely fitted in the substantially horizontal direction, and the engaging member is engaged with the engaged member. It is further preferable that the bed is provided so as to be movable between a locking position loosely fitted in the stop hole and a retracted position retracted from the locked hole (claim 7).

On the other hand, it is preferable that the table elevating and lowering drive means is provided with a hydraulic cylinder that expands and contracts in the vertical direction, and connects the bed and the table via the hydraulic cylinder (claim 8).

In this case, it is more effective if a plurality of hydraulic cylinders are vertically arranged and connected to each other, the lowermost hydraulic cylinder is fixed to the bed side, and the remaining hydraulic cylinders can be moved up and down with respect to the bed. There is (claim 9).

Furthermore, by making strokes of at least two hydraulic cylinders of the hydraulic cylinders different from each other, a more excellent effect as will be described later can be obtained (claim 10).

Further, the present invention is a machining method by the machining apparatus according to any one of claims 2 to 10, wherein the machining surface of the workpiece is raised and lowered by the tool holding portion before machining the workpiece. The height position of the table is adjusted so as to be within the range, and then the work is machined while raising and lowering the tool holder (claim 11).

[0017]

According to the above apparatus, even if there is a step on the work,
Since the height can be adjusted by raising and lowering the table, the stroke of raising and lowering the tool holding portion can be reduced by that amount, or the tool holding portion can be fixed and machining can be performed only by raising and lowering the table. Therefore, compared with the conventional case where the lifting stroke of the tool holding part must be set large,
The tool holding portion can be shortened to increase its bending rigidity, and the processing speed can be increased accordingly.

However, if machining is performed while raising and lowering the table, the table, which is heavier than the tool holding portion, must be finely raised and lowered in real time, which consumes a large amount of power, and speeds up machining. However, if it is a device in which both the table and the tool holder are driven up and down like the device according to claim 2, before the work machining, as in the method according to claim 11, By adjusting the height position of the table so that the machining surface of this work fits within the lifting range of the tool held by the tool holding part, and then working the work while raising and lowering the tool holding part, the tool holding Rapid machining is possible while minimizing the lifting stroke of the part.

In this apparatus, if the uppermost position of the table is lower than the lowermost position of the tool held by the tool holding portion, the tool cannot reach the work when the height of the work is extremely small. On the contrary, if the uppermost position of the table is higher than the lowermost position of the above tool, the stroke of the tool holding part and the lifting stroke of the table overlap by that amount, and the overlap of the tool holding part The lifting stroke is wasted, but if the lowermost position of the tool held by the tool holding part and the uppermost position of the table are set to substantially the same height position as in claim 3, the lifting and lowering of the tool holding part is performed. By making full use of this stroke while keeping the stroke small, the tool can reach the machined surface regardless of the workpiece shape.

As described above, in the method in which the table is moved up and down before processing to adjust the height position of the work and the tool holding section is moved up and down exclusively during processing, the table is surely kept in a normal state during processing. It is important to fix it (generally horizontal). Here, in the apparatus according to the fourth aspect, since the table locking means for locking the table at a plurality of different upper and lower locking positions is provided, the table is moved up and down to a suitable position from the locking positions. By locking the table here, the table can be fixed in a good state during processing.

In this case, in the apparatus according to the fifth aspect, since the lifting stroke of the tool holding portion is set to be equal to or more than the vertical interval between the locking positions, an appropriate locking position is selected according to the work shape. As a result, the machined surface of the work can be surely contained within the lifting range of the tool. Moreover,
By keeping the lifting stroke of the tool holding part smaller than the entire lifting stroke of the table, the bending rigidity of the tool holding part can be maintained high.

Specifically, as means for locking the table,
In the device according to claim 6, in the state where the locking member is retracted to the retracted position, the locked portion of the locked member is located slightly above the position corresponding to the locking position of the locking member. The table is moved up and down until an arbitrary locked portion of the above is positioned, and in this state, the locking member is switched from the retracted position to the locked position, and then the table is lowered to move the locked portion to the engaging portion. By placing the table on the stop member, the table can be locked in a stable state by utilizing its own weight. Further, even if the table is driven in the descending direction to positively press the locked portion against the locking member, it is possible to perform positioning.
Needless to say.

More specifically, in the apparatus according to claim 7,
The table is driven up and down while the locked member is fitted in the vertical guide hole provided in the bed, and the locking member is moved substantially horizontally in the locked hole provided in the locked member. In the fitted state, the locked member supports the locked member from below.

Here, in the apparatus according to the eighth aspect, the table can be appropriately moved up and down by supplying the hydraulic pressure to the hydraulic cylinder. Then, by releasing the hydraulic pressure in a state in which an arbitrary locked portion is located slightly above the locking position of the locking member, the table is lowered by its own weight and locked on the locking member. The member can be easily placed.

Further, in the apparatus according to the ninth aspect, a plurality of the hydraulic cylinders are vertically arranged and connected to each other, the lowermost hydraulic cylinder is fixed to the bed side, and the remaining hydraulic cylinders can be moved up and down with respect to the bed. Since it is configured, the height position of the table can be adjusted over a plurality of stages by changing the number of hydraulic cylinders to be extended and the number of hydraulic cylinders to be contracted.

Further, according to the tenth aspect, the strokes of at least two of the hydraulic cylinders are made different from each other so that the number of table height positions selectable by extension / contraction of the hydraulic cylinders. Will increase further.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS.

The processing apparatus shown in FIGS. 4 and 5 has a bed 1
It has 0. A plurality of columns 12 are erected on both left and right sides of the bed 10, and a beam 14 extending in the arranging direction is horizontally supported by the columns 12. A slider 16 driven by a motor is supported along the longitudinal direction of the left and right beams 14, and both ends of a beam 18 orthogonal to the beam 14 are supported by both sliders 16. A slider 20 driven by a motor is supported along the longitudinal direction of the beam 18, and the ram (tool holding portion) 2 is supported by the slider 20.
2 is supported so as to be able to move up and down. The ram 22 supports a vertically extending main shaft, has a built-in motor for rotationally driving the main shaft, and has a chuck 27 for holding a tool 27 at the lower end of the main shaft. The entire ram 22 is moved up and down by a ram up-and-down drive means 24 including a motor and a feed screw mechanism.

A characteristic of this processing apparatus is that the bed 1 is
A table 28 is installed on the 0 so that it can be moved up and down. FIG.
And, as shown in FIG. 2, on the lower surface of the table 28,
Plural (six in the illustrated example) locked members 30 extending vertically
While the upper end of each is connected, the same number of guide holes 31 are vertically provided in the bed 10, and the table 28 can be moved up and down by fitting the locked member 30 into each guide hole 31. It is supported by the bed 10.

As shown also in FIG. 3, each engaged member 30 has engaged holes 32 penetrating the engaged member 30 in a substantially horizontal direction and arranged at equal intervals over a plurality of upper and lower stages (6 stages in the illustrated example). It is set up. On the other hand, inside the bed 10, at a predetermined height position, the bushes 34,
36 are provided, and a locking pin (locking member) 38 is supported by these bushes 34 so as to be slidable in the axial direction.

The diameter of the locking pin 38 is set so that it can be fitted into the bushes 34, 36 with almost no clearance and can be loosely fitted in the locked holes 32. A hydraulic cylinder 40 is laterally embedded in the lateral side of the locking pin 38, and the locking pin 38 is connected to the tip of a telescopic rod 42 of the hydraulic cylinder 40.
By the extension and contraction of 0, the locking pin 38 is locked by the locking pin 3
8 penetrates the locked hole 32 and both ends are supported by the bushes 34 and 36 (solid line position in FIG. 3), and the locking pin 38 withdraws from the locked hole 32, and only the pin tip ends. It can be switched to a retracted position supported by the bush 34 (position indicated by a chain double-dashed line in the figure).

In the bed 10, the guide hole 31
Similarly, a plurality of through holes 44 that vertically penetrate the bed 10 are formed at positions different from the above, and hydraulic cylinders 46, 47, and 48 are provided upward in each through hole 44 in three stages. There is.

Of these hydraulic cylinders 46-48,
The main body of the lowermost hydraulic cylinder 46 is completely fixed to the bed 10 side. The middle hydraulic cylinder 47 is used for the bed 1.
It can be moved up and down with respect to 0, and its main body is connected to the upper end of the telescopic rod 46a of the hydraulic cylinder 46. The uppermost hydraulic cylinder 48 is also movable up and down with respect to the bed 10, and its main body is connected to the upper end of the telescopic rod 47a of the hydraulic cylinder 47. The telescopic rod 48a of the hydraulic cylinder 48 is attached to the lower surface of the table 28. It is connected.

Further, in this embodiment, the strokes of the hydraulic cylinders 46, 47, 48 are set to be different from each other, and therefore, the hydraulic cylinders 46 to 4 are set.
The height of the table 28 can theoretically be adjusted in 2 ³ = 8 steps by appropriately selecting the cylinder to be extended and the cylinder to be contracted. The hydraulic pressure is adjusted so that the height position of the locked member 32 coincides with the height position of the bushes 34, 36 in a state where the table 28 is positioned at six positions among these eight positions. The strokes of the cylinders 46 to 48 and the formation position of the locked hole 32 are set.

Further, the lifting stroke Sr of the ram 22 shown in FIG. 5 is the total lifting stroke of the table shown in FIG. 5 (that is, the position where all the hydraulic cylinders 46 to 48 are extended from the position where all the hydraulic cylinders 46 to 48 are extended). Stroke of the table 28 up to St) and is not less than the interval p between the locked holes 32 shown in FIG.
Further, both strokes S are set so that the position of the tool 27 when the ram 22 is most lowered and the position of the table upper surface when the table 28 is most raised are almost at the same height position.
r and St are set (see FIG. 5).

Next, a processing method using this apparatus will be described.

First, the hydraulic cylinder 40 shown in FIG. 3 is contracted to retract the locking pin 38 to the retracted position indicated by the chain double-dashed line in FIG. 3, while the work is set at a predetermined position on the table 28. Next, in order to adjust the height position of the table 28 so that the machining surface (for example, the upper surface) of this work is within the lifting range of the tool 27, hydraulic pressure is applied only to an appropriate hydraulic cylinder of the hydraulic cylinders 46 to 48. Supply to extend the cylinder. As a result, the table 28 is lifted from the lowermost position by the sum of the strokes of the extended hydraulic cylinders.

At this time, one of the plurality of locked holes 32 in the locked member 30 coincides with the disposition position of the bushes 34, 36. In this state, the hydraulic cylinder 40 is extended, the locking pin 38 is advanced to the locking position where the locking pin 38 is loosely fitted in the locked hole 32, and then the hydraulic cylinders 46 to 48 are selected. The hydraulic pressure is released from the hydraulic cylinder being extended, and the table 28 is gently lowered by its own weight. Then, as shown in FIG.
The inner peripheral upper surface of the locked hole 32 at is placed on the locking pin 38, whereby the entire table 28 is supported by the locking pin 38 from below. In this state, while appropriately moving up and down and moving the ram 22 horizontally,
The surface of the work can be processed by the tool 27 held at.

According to such an apparatus, since the height position of the work can be adjusted by raising and lowering the table 28, the relative height between the tool 27 and the work can be adjusted only by raising and lowering the ram 22 according to the shape of the work as in the conventional case. The lifting stroke Sr of the ram 22 can be greatly reduced as compared with the device for adjusting the position. Therefore, the ram 22 itself can be shortened and the bending rigidity thereof can be increased, whereby the processing speed (that is, the moving speed of the ram 22) can be increased without deteriorating the processing accuracy.

The present invention is not limited to such an embodiment, and the following embodiments can be adopted as an example.

(1) In the above embodiment, the number of stages and the stroke of the hydraulic cylinder for raising and lowering drive are not particularly limited.
However, if the hydraulic cylinders are installed in a plurality of stages as described above, the height position of the table 28 can be adjusted in a plurality of stages, and the strokes of all the hydraulic cylinders are made different by making the strokes of the hydraulic cylinders different from each other. There is the advantage that the number of selectable height positions can be further increased compared to the same one.

(2) The hydraulic cylinder 46 shown in the above embodiment
6 to FIG. 6 as a second embodiment, the feed screw 50 is rotatably connected to the table 28 and inserted into the through hole 44 of the bed 10, while the feed screw 50 is attached to the bed 10 side. The table 28 can also be moved up and down by fixing the screwed nut 52 and rotating the feed screw 50 by the motor 54. However, in this case, after the locking pin 38 is loosely fitted in one of the locked holes 32, the table 28 is purposely driven downward to place the inner peripheral upper surface of the locked hole 32 on the locking pin 38. Although it is necessary, if the hydraulic cylinders 46 to 48 are used as in the above embodiment, after the locking pin 38 is fitted into the locked hole 32,
In this state, the table 28 is lowered by its own weight by a simple operation of removing the hydraulic pressure from the hydraulic cylinder that is being extended, and the upper surface of the inner circumference of the locked hole 32 is automatically placed on the locking pin 38. There is an advantage that can be.

(3) The locked member 30 shown in the above embodiment is fixed to the side of the table 28 instead of the lower surface of the table 28, and the locking pin 38 is provided above the upper surface of the bed 10. The table 28 can be locked. In this case, the locked portion does not have to be the locked hole 32 as described above, and for example, a locked projection is provided on the side surface of the locked member 30 so as to project laterally. You may make it the structure supported from the bottom by a locking member. However, if the locked hole 32 is fitted into the locked member 30 and the locked member 30 is fitted into the guide hole 31 on the bed 10 side as in the above-described embodiment, the table can be fitted by this fitting. There is an advantage that the guide effect of 28 can be obtained, and the table 28 can be lifted and lowered in the vertical direction more accurately.

(4) In the device shown in FIG. 1, instead of providing the locking pin 38, a clamp device is provided on the bed 10 side, and the locked member 30 and the like are clamped by this clamp device. Table 28 on the bed 10 side
Can be locked. However, in this case,
While a large holding force is required to fix the table 28, if the structure in which the locked member 32 is placed on the locking pin 38 as in the above-described embodiment is used, the weight of the table 28 is utilized, There is an advantage that the table 28 can be locked in a stable state with a small holding force.

(5) In the present invention, the lifting stroke Sr of the ram 22 may be set appropriately. However, if the stroke Sr is set to be equal to or more than the vertical distance between the locking positions (that is, the distance p between the locked holes 32) as in the above embodiment, no matter what shape the work is, it is suitable for it. By selecting the locking position, it is possible to ensure that the machined surface of the work is within the lifting range of the tool 27. Moreover, by keeping the lifting stroke Sr of the ram 22 smaller than the total lifting stroke St of the table 28, the bending rigidity of the ram 22 can be maintained high.

When setting this stroke, the ram 22
From the lowermost position of the tool 27 held by the table 2
If the uppermost position of 8 is lowered, the above tool may not reach the work whose height dimension is extremely small. On the contrary,
If the uppermost position of the table 28 is made significantly higher than the lowermost position of the tool 27, the stroke of the ram 22 and the lifting stroke of the table 28 overlap by a large amount, and the lifting stroke of the ram 22 is wasted. As in the above-described embodiment, if the lowermost position of the tool 27 held by the ram 22 and the uppermost position of the table 28 are set at substantially equal height positions, the tool 27 and the work can be moved relative to each other. The entire stroke S is the lifting stroke S of the ram 22.
r becomes almost equal to the sum of all strokes St of the table 28 (FIG. 5), and the lifting stroke Sr of the ram 22 is kept small while making full use of it so that the tool can reach the machining surface regardless of the work shape. There is an advantage that can be.

(6) For example, in the case of the device shown in FIG.
The height position on the ram side is completely fixed, and the table 28
It is also possible to proceed with the processing of the work on the table 28 only by raising and lowering the work. However, in this case, since the heavy table 28 has to be finely moved up and down in real time, the required power is large as compared with the case where the ram 22 is moved up and down, and the inertia of the table 28 is large. However, before the work is machined as in the above-described embodiment, the table 28 is moved up and down in advance so that the machined surface of the work falls within the elevating range of the tool held by the ram 22. The height position is adjusted, and the ram 22 is finely moved up and down according to the shape of the workpiece during machining.
There is an advantage that it is possible to realize more rapid machining with less power while minimizing the lifting stroke of.

[0048]

As described above, according to the present invention, the table is moved up and down in the machining apparatus which advances the machining while relatively moving the tool and the workpiece held by the tool holder. By adjusting the height of the tool holder by raising and lowering the table, the stroke of raising and lowering the tool holding portion can be reduced, or the tool holding portion can be fixed and machining can be performed only by raising and lowering the table. Therefore, as compared with the conventional one in which only the tool holding part is greatly moved up and down, the bending rigidity of the tool holding part is increased, and the processing speed (that is, the moving speed of the tool holding part) is achieved without degrading the processing accuracy.
There is an effect that can be raised.

Here, in the apparatus according to the second aspect, both the table and the tool holding portion are driven to move up and down, and therefore, as in the method according to the eleventh aspect, the machining surface of the workpiece is processed before machining the workpiece. Adjusts the height position of the table so that the tool is held within the lifting range of the tool held by the tool holding section, and then the workpiece is machined while moving the tool holding section up and down to increase the lifting stroke of the tool holding section. It has the effect of achieving faster machining with less power, while minimizing it.

In the apparatus according to the third aspect, since the lowermost position of the tool held by the tool holding part and the uppermost position of the table are set at substantially the same height position, the lifting stroke of the tool holding part is set. It has the effect that the tool can reach the machined surface regardless of the shape of the workpiece by fully utilizing this while keeping the value small.

Further, in the apparatus according to the fourth aspect, since the table locking means for locking the table at a plurality of vertically different locking positions is provided, the table can be moved to an appropriate position among the locking positions. By moving up and down and locking the table here, the table can be fixed in a good state during processing, and there is an effect that more precise processing can be performed.

Here, in the apparatus according to the fifth aspect, since the lifting stroke of the tool holding portion is set to be equal to or more than the vertical interval between the locking positions, the work position is selected from among the locking positions depending on the shape of the work. By selecting an appropriate locking position, there is an effect that the machined surface of the work can be surely kept within the lifting range of the tool. Moreover, since the lifting stroke of the tool holder is kept smaller than the total lifting stroke of the table, the bending rigidity of the tool holder can be kept high.

According to a sixth aspect of the present invention, a locked member extending vertically is connected to the table, and the locked portions are provided at a plurality of vertically different positions on the locked member,
Since the locking member that is movable between the locking position that supports the locked portion from below and the retracted position that retracts from the locked portion is used, it is possible to use the weight of the table. With a small holding force, the table can be locked in a stable state.

More specifically, in the apparatus according to claim 7,
Since the table is moved up and down with the locked member fitted in the vertical guide hole provided in the bed, the table can be moved up and down in a more accurate direction, and the above-mentioned engaged By lowering the table with the locking member loosely fitted in the locked hole provided in the stop member in a substantially horizontal direction, the locked member is supported in a stable state from below by utilizing the weight of the table. There is an effect that can be done.

Further, in the apparatus according to the eighth aspect, the hydraulic pressure is supplied to the hydraulic cylinder to drive the table up and down, and the arbitrary locked portion is positioned slightly above the locking position of the locking member. Thus, there is an effect that the table can be lowered by its own weight and the locked member can be automatically placed on the locking member only by releasing the hydraulic pressure.

Further, in the apparatus according to the ninth aspect, a plurality of the hydraulic cylinders are arranged vertically and interconnected, the lowermost hydraulic cylinder is fixed to the bed side, and the remaining hydraulic cylinders can be moved up and down with respect to the bed. Since it is configured, by changing the number of hydraulic cylinders to be expanded and the number of hydraulic cylinders to be contracted, it is possible to adjust the height position of the table over a plurality of stages with a simple structure.

Further, in the apparatus according to the tenth aspect, since the strokes of at least two hydraulic cylinders among the hydraulic cylinders are different from each other, the strokes of all the hydraulic cylinders can be selected as compared with those having the same stroke. There is an effect that the number of height positions can be further increased.

[Brief description of drawings]

FIG. 1 is a sectional front view showing a main part of a processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional side view showing a table locking structure in the processing device.

FIG. 4 is an overall perspective view of the processing apparatus.

FIG. 5 is an overall side view of the processing apparatus.

FIG. 6 is a sectional front view showing a main part of a processing apparatus according to a second embodiment of the present invention.

7A and 7B are cross-sectional views showing a processing operation in a conventional processing device.

[Explanation of symbols]

 10 bed 22 ram (tool holding part) 24 ram lifting drive means 27 tool 28 table 30 locked member 31 guide hole 32 locked hole 38 locking pin (locking member) 46 to 48 hydraulic cylinder 50 feed screw

Claims (11)

[Claims] 1. A machining method, comprising: a tool holding unit for holding a tool; and a table on which a work is placed, wherein the work is machined while the tool holding unit is moved relative to the work. A processing apparatus, wherein the table is configured to be capable of moving up and down, and is provided with a table lifting drive means for driving the table up and down. 2. The machining apparatus according to claim 1, further comprising a tool elevating and lowering drive unit configured to elevate and lower the tool holding section and to elevate and lower the tool holding section. 3. The processing apparatus according to claim 2, wherein the lowermost position of the tool held by the tool holding portion and the uppermost position of the table are set at substantially equal height positions. . 4. The processing apparatus according to claim 2 or 3, further comprising a table locking unit that locks the table at a plurality of vertically different locking positions. 5. The machining apparatus according to claim 4, wherein the lifting stroke of the tool holding portion is set to a stroke that is equal to or more than the vertical distance between the locking positions and is smaller than the entire lifting stroke of the table. Processing equipment. 6. The processing apparatus according to claim 4 or 5, wherein a locked member extending vertically is connected to the table,
The locked member is provided with a locked portion at a plurality of vertically different positions, and is moved between a locked position for supporting the locked portion from below and a retracted position for retracting from the locked portion. A processing device comprising a lockable member capable of being processed. 7. The processing apparatus according to claim 6, wherein the bed is provided with a vertical guide hole, and the shape of the locked member is set to a shape that can be fitted into the guide hole. While the substantially horizontal engaged holes are provided at different vertical positions, the shape of the engaging member is set so that each engaged hole can be loosely fitted in the substantially horizontal direction. A processing apparatus, wherein a member is provided on the bed so as to be movable between a locking position where the member is loosely fitted in the locked hole and a retracted position where the member retracts from the locked hole. 8. The processing apparatus according to claim 6 or 7, wherein a hydraulic cylinder that expands and contracts in a vertical direction is provided as the table lifting / lowering drive means, and the bed and the table are connected via the hydraulic cylinder. Processing equipment. 9. The processing apparatus according to claim 8, wherein a plurality of hydraulic cylinders are arranged vertically and interconnected,
A processing device characterized in that the lowermost hydraulic cylinder is fixed to the bed side, and the remaining hydraulic cylinders can be raised and lowered with respect to the bed. 10. The processing apparatus according to claim 9, wherein strokes of at least two hydraulic cylinders of the hydraulic cylinders are different from each other. 11. A machining method using the machining apparatus according to claim 2, wherein the machining surface of the workpiece before the machining of the workpiece falls within the lifting range of the tool held by the tool holding portion. As described above, the machining method is performed by the machining apparatus, wherein the height position of the table is adjusted, and then the work is machined while moving the tool holder up and down.