JPH0540907Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a workpiece bed that can position and fix a workpiece fixing table at any arbitrary position on the base using fluid pressure.

[Prior art]

The workbed of a machine tool is often configured with an XY table in the case of large machines such as milling machines and grinding machines, but the workbed used in relatively small drilling machines etc. is supported so that it can be raised and lowered. Even if it is, it cannot move itself forward, backward, left or right with respect to the processing head. Therefore, if the workpiece to be cut must be fixed to the workbed of a drilling machine, the workpiece must be reinstalled on the workbed each time the machining position relative to the workpiece is changed, which reduces the machining process. A decline in efficiency is forced.

By the way, conventionally, electromagnetic adsorption type workbeds and air suction type workbeds have been provided as workbeds that allow the fixed position of the workpiece to be corrected relatively easily. In order to obtain a fixing force that can withstand resistance, the structure itself becomes complicated and special auxiliary equipment such as a large compressor or power transformer is also required, so it is difficult to apply it to small drilling machines etc. The equipment for this becomes relatively large.

[Problem that the invention attempts to solve]

As mentioned above, when conventional workbeds are applied to relatively small drilling machines, the workpiece must be reattached on the workbed every time the machining position relative to the workpiece is changed, which reduces machining efficiency. This forced a decline in
Although the fixing position of the workpiece can be adjusted relatively easily with electromagnetic adsorption type or air suction type workbeds, the structure and auxiliary equipment become complicated and large in proportion to the required fixing force. There was a problem with that.

The present invention was developed in view of the above-mentioned circumstances, and its purpose is to eliminate the need to remount the workpiece on the workpiece bed each time the machining position for the workpiece is changed, and to provide a simple structure. The goal is to provide a workbed that is easy to use.

[Means for solving problems]

The present invention, as a means to solve the above problems,
A workpiece fixing table to which a workpiece can be attached is slidably mounted on the upper flat part of the base having a through hole in the center, and a diaphragm separates the interior into upper and lower layers on the bottom flat part of the base. A casing is disposed in which the compressed fluid can selectively flow in or out, and a path is provided in the lower space of the casing to allow compressed fluid to selectively flow in or out. A disk and a spring that always springs the pressure-receiving disk downward are housed, and the pressure-receiving disk is provided with a spring that projects above the casing and is movable linearly and rotatably in the front, rear, left, and right directions inside the through hole. A rod inserted through the through hole is erected, and the rod is inserted into a support plate fixed to the bottom side of the workpiece fixing table, and the insertion tip of the rod is attached to the support plate when the diaphragm is not inflated. At the same time, a lock disk is fixed between the upper surface of the casing and the base and the workpiece fixing table can be clamped and fixed by the elastic force of the spring, and a lock disk is provided between the lock disk and the support plate. A structure is adopted in which a disc spring that springs in a direction to separate the two is interposed, and a valve is further provided to selectively allow compressed fluid to flow into or out of the path of the lower space of the casing.

[Effect]

In the workbed of the present invention, when the diaphragm is expanded by supplying compressed fluid to the lower space of the casing, the rod moves upward against the elastic force of the spring, and the workpiece fixing base is connected to the rod. The fixing state of the base due to the joint action of the bottom surface of the casing and the top surface of the casing is released, and the workpiece is fixed by allowing the workpiece fixing table to slide on the base to the extent that the rod can move inside the through hole. To enable positioning of a workpiece fastened to a fixed stand with respect to a machining head of a machine tool. At this time, a gap is created between the support plate and the lock disk, but the disc spring that applies an elastic force in the direction of separating them prevents the casing and the workpiece fixing table from shaking. Furthermore, when the supply of compressed fluid to the casing is stopped and the diaphragm is contracted, the workpiece fixing table and the upper surface of the casing clamp the base together with the elastic force of the spring, and the workpiece fixing table is placed in a predetermined position on the base. Can be fixed.

〔Example〕

The work bed of this example is constructed as a portable and versatile item.
It can also be dedicated to the machine tool as a work table for the machine tool.

1 has a downward opening on the bottom side and space 2
A generally rectangular through hole 3 is bored in the center of the base 1.

A workpiece fixing table 4 to which a workpiece (not shown) can be attached is slidably mounted on the upper surface side of the base 1. There is a T (not shown) on the surface of the workpiece fixing table 4.
T-slots 5 for fixing the work using nuts, clampers, etc. are formed at predetermined intervals vertically and horizontally, but instead of the T-slots 5, female screw holes for mounting the work are formed at predetermined intervals vertically and horizontally. A workpiece fixing table with threaded grips may also be used.

On the bottom side of the base 1, there is a diaphragm 7 inside.
The casing 8 separated into upper and lower layers is arranged.
The casing 8 is composed of a bottom casing 9 and a top casing 10, and the bottom casing 9 is provided with an annular groove 12 on its upper surface through which compressed air from an air source (not shown) flows in through an air supply duct 11. The entire surface of the casing 9 is covered with the diaphragm 7, a top casing 10 having a downwardly directed concave portion is placed on top of the diaphragm 7, and both the casings 9, 10 and the diaphragm 7 are screwed together with screws 13 so as to keep the contact surfaces airtight. Fix it.

The upper surface of the diaphragm 7 and the top casing 10
In the space formed between the diaphragm 7 and the downward concave portion, a pressure receiving disk 15 that can come into contact with the upper surface of the diaphragm 7 over a wide range is pushed downward by the elastic force of the disc spring 16, and the air is The pressure receiving disk 15 is housed so as to be displaced upward by the pressing force of the diaphragm 7 which expands upward due to pressure.
A rod 18 erected and fixed is projected from the top casing 10. Top casing 10
The rod 18 protruding from the top casing 10 has a length that reaches above the through hole 3 in a state in which the upper surface of the top casing 10 is in contact with the bottom surface of the base 1.

The workpiece fixing table 4 is placed on the upper surface of the base 1 so as to be able to slide to any position.
is formed, and the rod 1 is inserted into the opening of the recess 19.
A support plate 21 into which the upper end boss portion 20 of No. 8 is slidably inserted is fixed from below with screws 22. A lock disk 23 is fixed to the protruding end of the rod 18 inserted through the support plate 21 with a screw 24, and the support plate 21 is sandwiched between the lock disk 23 and the stepped portion of the rod 18. , supports the rod 18 relatively rotatably and with a slight gap 25 in the axial direction. The distance from the bottom surface of the lock disk 23 to the top surface of the pressure receiving disk 15 is such that when the diaphragm 7 is not expanded, the top surface of the casing 8 and the bottom surface of the workpiece fixing table 4 clamp and fix the base 1 by the elastic force of the disc spring 16. Set it as possible. Therefore, in a state where compressed air is not supplied to the lower surface of the diaphragm 7,
The lock disk 23, which receives the downward elastic force from the disc spring 16, presses the workpiece fixing table 4 downward via the support plate 21, and the disc spring 1
The casing 8, which receives the upward elastic force from the disc spring 66, presses the base 1 upward, whereby the upper surface of the casing 8 and the bottom surface of the workpiece fixing table 4 push the base 1 against each other by the elastic force of the disc spring 66. Fix it with clamping pressure. With compressed air being supplied to the lower surface of the diaphragm 7, the rod 18 is displaced upward against the elastic force of the disc spring 16, thereby releasing the pressing force from the bottom surface of the workpiece fixing table 4. , allowing free sliding displacement of the workpiece fixing table 4 on the base 1.

In addition, in order to prevent the pressure receiving disk 15 from rotating inside the casing 8 when the rod 18 rotates relative to the support plate 21, a pin 26 vertically disposed within the recess of the top casing 10 is slid onto the pressure receiving disk 15. Fits in freely. In addition, in order to absorb the looseness caused by the slight gap 25 at the insertion portion of the upper end boss portion 20 with respect to the support plate 21, a disc spring 27 is interposed between the bottom side of the lock disk 23 and the top side of the support plate 21. let

The air supply duct 11 that supplies air to the space between the bottom casing 9 and the diaphragm 7 is connected to the output of a switching valve 30 as a transfer valve provided on the back side of the base 1, as shown in FIG. Bind to a port. Switching valve 30
, its input port is connected to an external air source (not shown) via nipple 31, and its exhaust port is communicated with the atmospheric pressure side. Connect the port to the exhaust port, and connect the input port to the output port with the operating lever 32 tilted to the left in FIG. This operating lever 32 can be operated from the peripheral side of the base 1.
The upper surface of the operating lever 32 is covered by a protector 33 protruding from the periphery of the operating lever 32, thereby preventing the operator from accidentally touching it and making it difficult to operate it erroneously.

Next, the operation of the above embodiment will be explained.

When the workbed according to this embodiment is used in a drilling machine, the bed of the drilling machine (not shown) should be
The base 1 is mounted and fixed, and a workpiece (not shown) is further tightened and fixed to the workpiece fixing table 4 using the T-groove 5 (or female threaded hole) for use.

In order to align the machining position of the workpiece that is fastened to the workpiece fixing table 4 with the tip of a drill attached to a drilling machine (not shown), set the operating lever 32 to the left side in FIG. 2. , the output port of the switching valve 30 is connected to the input port to allow compressed air to flow into the space between the bottom casing 9 and the diaphragm 7. At this time, as the rod 18 moves upward against the elastic force of the disk spring 16, the lock disk 23 is moved to the workpiece fixing table 4 via the support plate 21 under the elastic force of the disk spring 16.
The downward pressing force acting on the base 1 is released, and the clamping state of the base 1 between the top surface of the casing 8 and the bottom surface of the workpiece fixing table 4 is released. In this state,
The workpiece fixing table 4 on the base 1 can be slid and rotated to any position within the range in which the rod 18 can move inside the through hole 3. Thereby, the workpiece fixing table 4 is manually slid on the base 1, and the processing position of the workpiece is aligned with the tip of a drill attached to a drilling machine (not shown). At this time, a gap is created between the support plate 21 and the lock disk 23, but the disc spring 27, which applies an elastic force in the direction of separating them, prevents the casing 8 and the workpiece fixing base 4 from shaking. . Therefore, the positioning of the workpiece can be performed smoothly.

After positioning, move the operating lever 32 in the opposite direction (to the left in FIG. 2) to open the space between the bottom casing 9 and the lower surface of the diaphragm 7 to the atmospheric pressure side via the switching valve 30. When the diaphragm 7 contracts, the pressure receiving disk 15 is displaced downward together with the rod 18 by the elastic force of the disc spring 16. As a result, the lock disk 23, which receives the downward elastic force from the disc spring 16, presses the workpiece fixing table 4 downward via the support plate 21, and the casing 8, which receives the upward elastic force from the disc spring 16, presses the workpiece fixing base 4 downward. 1 upward, thereby causing the upper surface of the casing 8 and the workpiece fixing base 4 to
The bottom surfaces of the base 1 are clamped and fixed to each other by the elastic force of the disc spring 66.

During drilling work using a drilling machine, the worker usually does the following:
Grip the lifting/lowering operating handle of the processing head with one hand to align the workpiece fixing base 4 on the base 1, and operate the operating lever 82 with the other hand to move the aligned workpiece fixing base 4 onto the base 1. Fix it. Therefore, in the drilling operation in which the machining head is lowered using the workbed of this embodiment, the hand positioning the workpiece fixing table 4 must be moved by the operating lever 3.
This is possible after positioning and fixing the workpiece fixing table 4 to the base 1 instead of holding the workpiece holding table 4, so when the machining head is lowered, the other hand must be on the operation lever 32 side, that is, on the side of the base 1. As a result, the risk of an accident caused by the user's hand accidentally touching the drill attached to the tip of the processing head is significantly reduced. Furthermore, since the upper surface of the operating lever 32 is covered by a protector 33 that protrudes from the periphery of the base 1, an operator may accidentally touch it during drilling and the workpiece fixing table 4 may be damaged relative to the base 1. To prevent the situation where the fixed state of the is released.

When the workpiece fixing table 4 is positioned and fixed on the base 1, the through hole 3 formed in the base 1 allows the workpiece fixing table 4 to hold the Since the part is closed (see FIG. 2) and the workpiece fixing table 4 is connected to the rod 18 without any through-holes formed on its front and back surfaces, chips generated during the cutting operation will be absorbed into the casing 8. It will not accumulate on the top surface. Therefore, when repeatedly fixing the upper surface of the casing 8 and the bottom surface of the workpiece fixing table 4 with chips interposed between the two, even if the chips are crushed between the two surfaces, the casing 8
is shifted relatively downward from the bottom side of the base 1, and even when the diaphragm 7 expands, it becomes impossible to sufficiently release the pressing force on the base 1 by the workpiece fixing table 4, making it difficult to slide the workpiece fixing table 4. Prevent situations where this happens.

During the drilling process, the workpiece fixing table 4 is fixed to the base 1 when the space formed by the bottom casing 9 and the diaphragm 7 is communicated with the atmospheric pressure side. Therefore, even if the air supply to the work bed is cut off due to stopping the drive of the air source (not shown) or cutting off the duct connected to the air source, such air supply stop will not fix the work bed. This does not affect the fixed state of the table 4 in any way, and even if the air supply is stopped during the drilling operation, accidents caused by this can be prevented.

After drilling, to change the machining position relative to the workpiece, move the operating lever 32 again to the second position.
The position of the workpiece fixing table 4 with respect to the base 1 can be changed after tilting it to the left side in the figure. In this way, when changing the machining position on the workpiece, it is only necessary to operate the operating lever 32.
Since it is not necessary to correct the fixing position of the base 1 to the bed of a machine tool (not shown) each time, machining efficiency is improved.

It goes without saying that the present invention is not limited to the above embodiments, and can be modified in various ways without departing from the gist thereof.

For example, in the above embodiment, the workpiece fixing table is described as having a structure having a T-groove and a female thread, but it may also be provided with other structures necessary for fixing the workpiece, such as a clamp lever.

Further, in the above embodiment, the switching valve is fixedly arranged on the base, but a foot-operated pedal valve may be provided outside the base. Furthermore, the working fluid that expands the diaphragm is not limited to compressed air, but may also be pressurized oil.

The work bed of the present invention is not limited to one that can be carried by itself and has the versatility of being fixed to the bed of any machine tool as in the above embodiment; It can be used as a workbed itself, or can be applied to a workbed that is fixed to the bed or frame and used as a dedicated device for the machine tool.

[Effect of idea]

With the workbed of the present invention, the position of the workpiece fixing table relative to the base can be arbitrarily set simply by supplying and stopping the working fluid into the casing. In other words, when the expansion pressure of the diaphragm caused by the compressed fluid moves the rod upward against the elastic force of the spring, the fixing force of the base and workpiece fixing table between the upper surface of the casing and the lock disk is relaxed. In this state, the workpiece fixing table is movable to any position on the base within a range corresponding to the gap between the rod and the through hole. Therefore, there is no need to re-fix the workpiece every time the machining position on the workpiece fixing table is changed, and the machining position can be corrected with a simple operation of switching the valve, and the range of correction can be adjusted. The effect is that it can be tolerated over a relatively wide range, thereby improving processing efficiency. Furthermore, when the diaphragm is expanded, a gap is created between the support plate and the lock disk, but the disc spring that applies elastic force in the direction of separating them prevents the casing and workpiece fixing table from shaking. Therefore, the positioning of the workpiece can be performed smoothly.

Moreover, when the workpiece fixing table is positioned and fixed on the base, the through hole formed in the base is covered by the workpiece fixing table no matter what position the workpiece fixing table takes with respect to the base.
In addition, since the workpiece fixing table is connected to the rod without any penetrating portions formed on its front and back surfaces, chips generated during cutting operations will not accumulate on the upper surface of the casing. Therefore, when repeatedly fixing the upper surface of the casing and the bottom surface of the workpiece fixing table with chips interposed between the two, the casing may be damaged by the inclusions formed by crushing the chips. This is to prevent the situation where the workpiece fixing table is shifted relatively downward from the bottom side and cannot sufficiently release the pressing force on the base by the workpiece fixing table even when the diaphragm expands, making it difficult to slide the workpiece fixing table. can.

Furthermore, during chip machining, the fixation of the workpiece fixing base to the base is achieved when the diaphragm is not expanded by the compressed fluid. This does not affect the fixing state of the workpiece fixing table in any way, and even if the supply of compressed fluid is stopped during the cutting operation, accidents caused by this can be prevented.

[Brief explanation of drawings]

The drawings show one embodiment of the work bed according to the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a bottom view, and FIG. 3 is a plan view. 1...Base, 3...Through hole, 4...Work fixing stand, 7...Diaphragm, 8...Casing,
9... Bottom casing, 10... Top casing, 15... Pressure receiving disk, 16... Belleville spring,
18... Rod, 20... Upper end boss section, 21...
Support plate, 23... Lock disk, 30...
...Switching valve, 32...Operation lever, 33...Protector.

Claims (1)

[Claims for Utility Model Registration] On the upper plane part of the base having a through hole in the center,
A workpiece fixing base to which a workpiece can be attached is slidably placed, and the bottom plane of the base has a
A casing is arranged inside which is separated into upper and lower layers by a diaphragm, and the lower space of the casing is provided with a path through which compressed fluid can selectively flow in or out, and the upper space of the casing is filled with the expansion pressure of the diaphragm. A pressure receiving disk that can be displaced upwardly in response to a pressure receiving disk, and a spring that springs the pressure receiving disk downward at all times are housed in the pressure receiving disk. A rod is inserted into the through hole so that it can move linearly and rotatably, and the rod is inserted into a support plate fixed to the bottom side of the workpiece fixing table.The insertion tip of the rod is attached to the diaphragm. When not inflated, the lock disk engages with the support plate to clamp and fix the base and workpiece fixing table between the upper surface of the casing and the spring, and the lock disk A disc spring that springs in a direction to separate them is interposed between the support plate and the support plate, and a valve is provided for selectively inflowing or outflowing compressed fluid into the path of the lower space of the casing, and from the valve. When the expansion pressure of the diaphragm caused by the supplied compressed fluid moves the rod upward against the elastic force of the spring, the clamping force between the upper surface of the casing and the lock disk between the base and the workpiece fixing table increases. 2. A work bed, characterized in that in a relaxed state, the work fixing table is movable to any position on the base within a range corresponding to the gap between the rod and the through hole.