JPH0739550Y2 - Chip dust prevention device for pallet clamp of machine tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial application field> The present invention relates to a chip dust preventive device for a pallet clamp part of a machine tool, and more particularly, to prevent chips from falling into a clamp chamber formed in an underframe of a machine tool. The present invention relates to a chip dust prevention device for a pallet clamp part of a machine tool that can be surely prevented.

<Prior Art> Conventionally, for example, as in a machining center, a pallet on which a workpiece is mounted and fixed is placed on an underframe, that is, a pallet base, and after a series of processing, a pallet on which a processed workpiece is mounted and fixed. There is a machine tool that operates in a procedure of replacing a pallet on which a raw workpiece is mounted and fixed. With this type of machine tool, chips are dropped from the pallet onto the upper surface of the pallet base when the pallet is replaced, causing malfunction of the clamper that fixes the pallet to the pallet base, or damage to the clamper and the clamped part. There is a risk.

In particular, for example, as shown in FIG. 4, a clamping chamber 2 is provided in a pallet base 1 of a machining center, and a clamped portion 4 provided on the upper surface of the pallet base 1 and on the lower surface of the pallet 3 is attached to the clamping chamber 2. In the machine tool in which the insertion port 5 for the insertion is opened and the clamper 7 for clamping the clamped portion 4 is provided in the clamp chamber 2,
If foreign matter such as cutting chips falls on the surface, there is a high possibility that the clamp device may malfunction and the clamper or the clamped part may be damaged.

Therefore, conventionally, the clamp chamber 2 is communicated with the dust removal fluid supply passage 8 and the dust removal fluid supplied to the clamp chamber 2 through the supply passage 8 is blown out from the insertion port 5.
It is configured to prevent foreign matter from falling into the clamp chamber 2.

<Problems to be Solved by the Invention> However, according to this conventional example, a heavy cutting dust may overcome the wind force of the dust removing fluid and fall into the clamp chamber 2. Chips with such a large weight are also large in size, and it is easy to carry over malfunctions such as the clamper being locked or the clamp position being misaligned. Also,
The clamper 7 and the clamped portion 4 are easily damaged.

The present invention has been made in view of the above circumstances, and is capable of reliably preventing chips from falling into a clamp chamber formed in an underframe of a machine tool. The purpose is to provide a device.

<Means for Solving the Problems> In the present invention, for example, as shown in FIG. 1, a clamping chamber 2 is provided in an underframe 1 of a machine tool, and an upper surface of the underframe 1 is provided with a lower surface of a pallet 3. An opening 5 for inserting the clamped portion 4 into the clamp chamber 2 is provided, and a clamper 7 for clamping the clamped portion 4 is provided in the clamp chamber 2, and a dust removal fluid supply path is provided in the clamp chamber 2. Connect 8
Premised on a chip dust prevention device for a pallet clamp part of a machine tool, which is configured to blow out the dust removal fluid supplied from the dust removal fluid supply source 9 to the clamp chamber 2 through the supply path 8 from the insertion port 5. However, in order to achieve the above purpose, the following measures are taken.

That is, a lid lifting means 10 is provided in the clamp chamber 2, and a dustproof lid 11 is supported on the lid lifting means 10, and the dustproof lid 11 is lifted by the lifting means 10 to close the insertion opening 5. And a dustproof lid 11 which is configured to be switchable between a retracted and lowered position where it is pushed down by the clamped portion 4 of the pallet 3 against the lid lifting means 10 and retracted into the clamp chamber 2, and which is located at the dustproof raised position. A blowout path 12 for the dustproof fluid is formed between the insertion opening 5 and the edge of the insertion opening 5.

The dustproof fluid used in the present invention is not particularly limited, and for example, compressed air, cutting fluid, grinding fluid, oil and other fluids can be used. However, when using a fluid other than cutting fluid such as oil or grinding fluid for the dust-proof fluid, it is necessary to separate the dust-proof fluid from the cutting fluid, the grinding fluid, etc. In order to
It is recommended to use compressed air, cutting fluid or grinding fluid as the dustproof fluid.

Further, the lid lifting means 10 of the present invention may be constructed so as to raise the dustproof lid 11 from the retracted and lowered position to the dustproof raised position, for example, pressure oil for driving the clamper 7 in the unclamping direction. A cylinder driven by hydraulic fluid or a cylinder driven by dustproof fluid,
It can be composed of a cylinder with a built-in spring.

<Operation> In the present invention, after the clamper 7 unclamps (unclamps) the clamped portion 4, the dustproof fluid is supplied to the clamp chamber 2 through the supply passage 8. Then, when the pallet 3 is raised, a gap is created between the lower surface of the pallet 3 and the underframe 1, and a flow path of the dust removing fluid is opened between the insertion opening 5 and the clamped portion 4, so that the insertion opening 5 Dust removal fluid begins to blow. Then, the dustproof lid 11 received on the lower surface of the clamped portion 4 is switched to the dustproof raised position by the lid lifting means 10, and the insertion opening 5 is formed between the edge of the dustproof lid 11 and the dustproof lid 11. It is covered with a dustproof lid 11 except for the passage 12. As a result, a part of the chips dropped from the pallet 3 to the insertion port 5 is received by the dustproof lid 11, and the remaining chips are blown off by the dust removal fluid blown out from the blowout passage 12. Since the blow-out passage 12 has a narrower flow passage cross-sectional area than the insertion opening 5, the flow is stronger than before flowing out from the entire insertion opening 5 and blown out from the blow-out opening 12 and the cutting weight is larger than the conventional one. Even powder is blown outside the insertion port 5.

In the present invention, a pallet seat 6 is formed on the upper surface of the underframe 1 around the insertion opening 5, and the outer peripheral surface of the dustproof lid 11 moves the dustproof fluid upward from the inside of the clamp chamber 2 to the outside. When forming the dustproof fluid guide surface 11a which is turned to the opposite direction, the dustproof fluid blown out from the blowout passage 12 is blown out in the direction along the upper surface of the underframe 1, so that the pallet seat 6 around the insertion opening 5 is formed. It is possible to blow off the chips that fall into the dust-proof fluid that is blown out from the blow-out path 12, and the chips that are blown off by the dust-proof fluid are blown off in the lateral direction of the insertion port 5, and the blown chips are It can be surely prevented from falling into the clamp chamber 2.

Further, a swirl driving flow path 13 that is inclined upward from below is formed in the dustproof lid 11, and the dustproof lid 11 is swung and driven by the reaction force of the dust removing fluid that flows through the flow path 13 to the outside of the insertion port 5. In the case of the above construction, the dust cover 11 swivels to give a centrifugal force to the chips that have fallen on the dust cover 11 so that they can be shaken off and removed from the dust cover 11.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a vertical cross-sectional view of a main part of a machining center equipped with a chip dust prevention device for a pallet clamp section according to an embodiment of the present invention.

The pallet base 1 that supports the pallet 3 is rotatably supported by a slide 14 that is provided so as to be slidably displaced in the front-back direction of the paper surface in the figure.

That is, the central shaft 14a is erected at the center of the slide 14,
The pallet base 1 is fitted onto the central shaft 14a so as to be horizontally rotatable and capable of moving up and down over a predetermined range, and the peripheral portion of the pallet base 1 is received by the slide 14 via an elastic roller.

Pallet seats 6 that bulge upward are provided at four locations (only one location is shown in the figure) on the upper surface of the pallet base 1, and the outer peripheral surface of the pallet base is formed from the circular truncated cone peripheral surface formed on the lower surface of the pallet 3. An alignment receiving surface 16 having a circular truncated cone shape that receives the alignment reference surface 15 is formed. Also,
Inside the pallet base 1, the clamp chambers 2 are provided in a coaxial manner coaxially with the pallet seats 6.

The pallet 3 has a lower surface provided with a clamped portion 4 that projects into the clamp chamber 2, and an insertion opening 5 for inserting the clamped portion 4 into the clamp chamber 2 is provided on the pallet seat 6.
Is opened on the upper surface of.

As shown in FIG. 1, the clamped portion 4 is formed in an inverted mushroom shape in which the expanded diameter portion 4a is connected to the lower end of the reduced diameter portion 4b.
The enlarged diameter portion 4a and the enlarged diameter portion 4a are connected by a tapered surface 4c.

Inside the clamp chamber 2, a collet 7 is provided as a clamper for clamping the clamped portion 4. In the lower part of the collet 7, there is formed a passive part 7a which is engaged with a return type hydraulic cylinder 17 incorporated in the bottom part of the clamp chamber 2. Further, when the collet 7 is pulled down by the hydraulic cylinder 17 on the upper portion of the collet 7, the collet 7 is pushed by the outer peripheral surface of the clamped portion 4 and engaged with the tapered surface 4c of the clamped portion 4, and the collet 7 is pushed by the hydraulic cylinder 17. Evacuation chamber 18 formed by expanding the upper diameter of clamp chamber 2 when is pushed up.
It is provided with an operating portion 7b that returns to the.

The evacuation chamber 18 formed in the upper part of the clamp chamber 2 is communicated with a supply path 8 for compressed air as a dust removing fluid, and the compressed air supplied to the clamp chamber 2 through this supply path 8 is blown out from the insertion port 5. Made to let you.

A piston rod 17a of a hydraulic cylinder 17 is inserted into the clamp chamber 2, and a lid lifting cylinder 10 is incorporated in the piston rod 17a. That is, the cylinder chamber 10a is formed in the piston rod 17a, and the cylinder chamber 10a
Pistons 10b are slidably inserted in a, and piston rods 10c extended above the piston rods 17a are provided at the upper ends of these pistons 10b.

A dust cover 11 for opening and closing the insertion port 5 is connected to the upper end of the piston rod 10c.

As shown in FIG. 4 (C) or FIG. 4 (D), the dustproof lid 11 is lifted by the lid lifting cylinder 10 to close the insertion opening 5 and the dustproof rising position and FIG. 4 (A) or 4 As shown in FIG. 2B, the lid lifting cylinder 10 is pushed down by the clamped portion 4 of the pallet 3 and is switchable to the retracted and lowered position where it is retracted into the clamp chamber 2. And the dustproof lid located at the dustproof rising position
A blowout path 12 for the dustproof fluid is formed between 11 and the edge of the insertion opening 5 over the entire circumference thereof.

As shown in FIGS. 2 (A) and 2 (B), the outer peripheral surface of the dust-proof lid 11 changes the dust-proof fluid laterally outward as it flows upward from within the clamp chamber 2. Face 11
On the other hand, while the a is formed, a swirl drive passage 13 is formed on the outer peripheral portion of the dustproof lid 11 so as to incline from the lower side to the upper side.
The dust-proof lid 11 is swiveled by the reaction force of the dust-removing fluid flowing through the insert-through opening 5.

Next, the operation of the chip dust preventive device of the pallet clamp portion of this machine tool will be described with reference to FIGS. 4 (A) to 4 (D).

While the pallet 3 is placed on the pallet base 1 and the workpiece is processed, pressure oil is supplied to the clamp pressure oil chamber 17b of the hydraulic cylinder 17 as shown in FIG. Is pulled down to fix the pallet 3 to the pallet base 1 via the clamped portion 4.

Next, when replacing the pallet 3, first, FIG. 4 (B)
Unclamp pressure oil chamber 17 of hydraulic cylinder 17
Pressure oil is supplied to c, the collet 7 is pushed upward, and the clamped portion 4 is opened. This makes it possible to lift the pallet 3 from the pallet base 1.

From this state, when the pallet 3 is pulled up as shown in FIG. 4 (C), the piston 10b and the piston rod 10c of the lid lifting cylinder 10 rise due to the hydraulic pressure of the unclamp pressure oil chamber 17c, and the dustproof lid 11 rises to the dustproof. Can be lifted to a position.

Further, by lifting the pallet 3 from the pallet base 1, the alignment reference surface 15 and the alignment receiving surface 16
The compressed air is blown laterally around the insertion port 5 from the supply passage 8 through the blow-out passage 12. This allows
The periphery of the insertion opening 5 including the positioning receiving surface 16 is cleaned with compressed air. Here, since the blow-out passage 12 has a narrower flow passage cross-sectional area than the insertion opening 5, compressed air blows out from the entire insertion opening 5 as a stronger flow than before and is blown out from the blow-out opening 12. Chips that are heavier than the above can be blown off to the outside of the insertion port 5. The chips blown off by the compressed air are blown out in the lateral direction of the insertion port 5, so that the chips once blown off are surely prevented from falling into the clamp chamber 2.

Further, a swirl driving flow path 13 that is inclined upward from below is formed in the dustproof lid 11, and the dustproof lid 11 is swung and driven by the reaction force of the dust removing fluid that flows through the flow path 13 to the outside of the insertion port 5. Since the dust cover 11 swivels, centrifugal force can be applied to the chips that fall on the dust cover 11 to shake it off the dust cover 11 and remove it. Can be cleaned evenly in all directions.

This cleaning with compressed air is performed until the pallet 3 is removed from the pallet base 1 and the next pallet 3 is mounted, as shown in FIG. 4 (D). And the fourth
As shown in FIG. 6B, when the dustproof lid 11 is lowered to the retracted lowering position by the clamped portion 4 of the pallet 3, the supply of compressed air is stopped.

<Advantage of Device> As described above, according to the present invention, when the pallet supported on the underframe is exchanged, most of the insertion opening for inserting the clamped part of the pallet into the clamp chamber is covered with the dustproof cover. At the same time, the dust-proof fluid is strongly blown out from the narrow blow-out path around the dust-proof lid, so it is possible to prevent chips that are larger and heavier than before from falling into the insertion port, and to the clamp chamber formed on the underframe of the machine tool. Make sure to prevent chips from falling,
It is possible to prevent malfunction and damage of the clamp.

Further, in the present invention, in particular, a pallet seat is formed on the upper surface of the underframe around the insertion opening, and the dustproof fluid is directed laterally outward as the dustproof fluid flows upward from the clamp chamber. When forming the dust-proof fluid guide surface to be changed, the dust-proof fluid blown out from the blow-out passage can be blown out in the direction along the upper surface of the underframe, so the dust removal performance can be further improved, and the dust-proof fluid between the pallet seat and the pallet can be improved. It is possible to reliably prevent machining error and damage to the pallet seat due to the cutting chips being caught.

Further, in the present invention, a swirl drive passage is formed in the dust cover so as to be inclined from the lower side to the upper side, and the dust cover is swung by the reaction force of the dust removing fluid flowing through the flow passage to the outside of the insertion port. When configured, the dust-proof lid swivels along with the blowing of the dust-removing fluid, and the chips that have fallen onto the dust-proof lid can be shaken off from the dust-proof lid by centrifugal force, so that the upper surface of the underframe can be cleaned more reliably. In addition, since the reaction force of the dust removing fluid is used as the drive source for driving the rotation of the dustproof lid, the structure is simple, and the operation can be performed easily and inexpensively.

[Brief description of drawings]

FIG. 1 is an enlarged vertical sectional view of an essential part of a chip dust prevention device for a pallet clamp according to an embodiment of the present invention, FIG. 2 (A) is a plan view of the dust cover, and FIG. 2 (B) is FIG. 3 is a side view of the dust-proof lid, FIG. 3 is a longitudinal sectional view of a main part of a machining center equipped with a chip dust-proof device for a pallet clamp section according to an embodiment of the present invention, and FIGS. 4 (A) to 4 (D). 10] is an explanatory view for sequentially explaining the operation of the chip dust-proof device. 1 ... Pallet base (underframe), 2 ... Clamping chamber, 3
...... Pallet, 4 …… Clamped part, 5 …… Insertion port, 6
...... Pallet seat, 7 ... Collet (clamper), 8 ...
... Supply path, 10 ... Lid lifting means cylinder (lid lifting means, 11 ... dust-proof lid, 11a ... dust-proof fluid guide surface, 12 ... blow-out path, 13 ... swirl drive flow path.

Claims (3)

[Scope of utility model registration request] 1. A clamp chamber (2) is provided in the underframe (1) of a machine tool, and a clamped part (4) is provided on the upper surface of the underframe (1) and on the lower surface of a pallet (3). An insertion opening (5) for inserting the clamp chamber (2) into the clamp chamber (2), and a clamper (7) for clamping the clamped portion (4) is provided in the clamp chamber (2). A pallet clamp part of a machine tool configured to communicate with a dust removal fluid supply path (8) and blow out the dust removal fluid supplied to the clamp chamber (2) through the supply path (8) from the insertion port (5) In the chip dust preventive device, a lid lifting means (10) is provided in the clamp chamber (2), and a dust protection lid (11) is provided on an upper portion of the lid lifting means (10).
This dustproof lid (11) is lifted by the lifting means (10) to close the insertion opening (5), and the clamped part () of the pallet (3) against the lifting means (10). Between the dustproof lid (11) located at the dustproof raised position and the edge of the insertion port (5), which is configured to be switchable to the retracted and lowered position where it is pushed down by 4) and retracted into the clamp chamber (2). A chip dust prevention device for a pallet clamp part of a machine tool, characterized in that a blowout path (12) for the dustproof fluid is formed in the 2. A pallet seat (6) is formed on a portion of the upper surface of the underframe (1) around the insertion port (5), and a dust-proof fluid is clamped on the outer peripheral surface of the dust-proof lid (11) in a clamp chamber (2). ) A chip dust prevention device for a pallet clamp part of a machine tool according to claim 1, characterized in that a dust prevention fluid guide surface (11a) is formed that is turned laterally outward as it flows upward from inside. 3. A dust-removing fluid that is formed in the dust-proof lid (11) and has a swivel drive flow passage (13) inclined from the lower side to the upper side and flows to the outside of the insertion port (5) through the flow passage (13). The dustproof device for a pallet clamp part of a machine tool according to claim 1 or 2, wherein the dustproof cover (11) is driven to rotate by the reaction force of