JPH0129000Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The invention belongs to the technical field of devices for fixing workpieces on the table of machine tools either directly or via a workpiece pallet. This invention relates to a technique for eliminating errors in machining of a workpiece due to biting of chips by blowing the chips away from the workpiece or workpiece pallet that is about to be received.

Specifically, as a prerequisite structure, for example, as shown in FIG.
A clamp 1 and a receiving surface cleaning nozzle 11 are provided, and chips adhering to the receiving surface 13 and the receiving surface 17 of the workpiece 7 or workpiece pallet 6 facing the same are blown off with fluid ejected from the receiving surface cleaning nozzle 11. , the workpiece 7 is received on the receiving surface 13 directly or via the workpiece pallet 6 and is clamped by the clamp 1.

<Prior art> Conventionally, there is a technology published in Japanese Patent Publication No. 56-38349. As described in the drawing of the publication, the workpiece 12 is brought into contact with the receiving surface 2 by opening a nozzle hole 3 for cleaning the receiving surface in the center of the receiving surface 2 that receives the workpiece 12. At times, the compressed air ejected from the nozzle hole 3 hits the back surface 13 of the workpiece 12 vertically, bends left and right, and then blows away the chips attached to the back surface 13 and the receiving surface 2 of the workpiece 12. Connected.

<Problem that the idea aims to solve> The above conventional structure has the following problems.

(b) Compressed air blows vertically against the back surface 13 of the workpiece and encounters a large resistance, which reduces the blowing force and makes it difficult to remove chips strongly.

(b) Chips attached to the part directly above the nozzle hole 3 on the back surface 13 of the workpiece remain there without being blown away to either the left or right, so when the back surface 13 of the workpiece is pressed against the receiving surface 2, the chips There is a high possibility that the particles may be pushed into the nozzle hole 3 and block the nozzle hole 3.

C. The compressed air ejected from the nozzle hole 3 is released after the back surface 13 of the workpiece has sufficiently approached the receiving surface 2.
Although the chips on the receiving surface 2 begin to be blown away, there is a great danger that they will get caught between the back surface 13 of the workpiece and the receiving surface 2 before they are blown away.

D. If the receiving surface 2 is long or wide, it is necessary to provide a large number of nozzle holes 3, which increases the processing cost.

The object of the present invention is to powerfully and reliably blow off chips from the receiving surface and the back side of the workpiece or workpiece pallet.

<Means for Solving the Problems> In order to achieve the above object, the present invention, as shown in FIG. A receiving surface 13 is positioned on the lateral outer side of the clamp shaft 8, and a receiving surface cleaning nozzle 11 is opened on the circumferential surface of the clamp shaft 8 so as to face the receiving surface 13 from the side. Work 7 facing this
Alternatively, it is characterized in that it is constructed so that it can be blown through the receiving surface 17 of the work pallet 6 from the side.

<Effect> Next, the operation of the present invention will be explained.

The fluid such as air or oil ejected from the receiving surface cleaning nozzle 11 has an appropriate spread angle in the front and rear direction.
It passes straight and vigorously through the gap between the opposing surfaces of the receiving surface 13 and the workpiece 7 or workpiece pallet 6. At this time, the chips are strongly and reliably blown away cleanly from both opposing surfaces.

<Example> Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1 shows a longitudinal sectional front view of the clamping device,
FIG. 2 shows a sectional view taken along the line -- in FIG.

This pallet clamp 1 consists of a short cylindrical clamp body 2 and a clamp chamber 3 formed inside the clamp body 2.
As shown in FIGS. 3 and 4, it is mounted on a table 5 of a machine tool (not shown) and fixes a work 7 on the table 5 via a work pallet 6. It is.

A clamp shaft 8 extends upward from the piston 4 that slides within the clamp chamber 3 of the clamp body 2, and a lift spring that pushes the clamp shaft 8 upward extends between the clamp shaft 8 and the piston 4. 9 is provided.

Clamp shaft 8 protruding above the clamp body 2
The upper end portion 8a is formed into a T-shape so as to fit into a T-groove 10 formed in the lower surface 6a of the work pallet 6.

Then, the work pallet 6 is inserted into the guide rail groove 1.
As shown in FIG. 1, a pallet roller 19 attached to the pallet roller 8 holds the lower surface 6a of the work pallet 6 in a state raised above a pallet receiving surface 13, which will be described later.

The pallet roller 19 is configured to push down a U-shaped steel section 20 with a push-down spring 21, thereby pressing downwardly a roller 23 attached to the section steel 22.

A receiving surface cleaning nozzle 11 is opened in the clamp shaft 8 near the top surface of the clamp body 2.

This receiving surface cleaning nozzle 11 communicates with an air supply path 12 formed in the table 5, and is connected to the air supply path 12 formed in the table 5.
As shown in the figure, the upper surface 2a of the clamp body 2 on the outer periphery of the clamp shaft 8 is opened toward the pallet receiving surface 13 formed in an arc shape, and the pallet receiving surface 13 and the receiving surface 17 of the pallet 6 facing it are opened. Air is constantly injected into the air.

In addition, the reference numeral 14 in the figure is a nozzle direction specifying pin that is set upright from the table 5, and this pin 14 controls the rotation of the piston 4 so that the opening of the receiving surface cleaning nozzle 11 is always correctly directed toward the pallet receiving surface 13. It's becoming like that.

Further, reference numeral 15 is a hydraulic oil supply pipe that supplies hydraulic oil to the clamp chamber 3.

The operation of the workpiece pallet fixing device for a machine tool constructed as described above will now be described.

First, when fixing the work pallet 6 on the table 5, the upper end surface 8a of the clamp shaft 8 is fitted into the T-groove 10 formed at the bottom of the work pallet 6, and then the hydraulic oil switching valve for clamp operation (not shown) is fitted. to supply hydraulic oil from the hydraulic oil supply pipe 15 to the clamp chamber 3, and move the piston 4 to the lift spring 9.
The workpiece pallet 6 is pressed against the pallet receiving surface 13, and the workpiece 7 is fixed on the table 5 of the machine tool via the workpiece pallet 6. At this time, air is supplied from the air supply path 12 of the table 5 to the receiving surface cleaning nozzle 11, and the air jetted from the receiving surface cleaning nozzle 11 is guided to the lower surface 6a of the pallet 6, blows against the pallet receiving surface 13, and cleans the pallet receiving surface. Chips adhering to the surface 13 and the lower surface 6a of the pallet 6 in contact with this are removed.

Next, when the workpiece 7 has been processed and the pallet 6 is to be removed from the table 5, the hydraulic oil switching valve is operated to release the hydraulic oil supplied to the clamp chamber 3, and the piston 4 is moved by the lift spring 9. When the work pallet 6 is lifted up from the pallet receiving surface 13 and the T-groove 10 of the pallet 6 and the upper end 8a of the clamp shaft 8 are disengaged,
Pallet 6 can be removed from table 5.

In this way, when the lower surface 6a of the pallet 6 rises above the pallet receiving surface 13, the air jetted from the receiving surface cleaning nozzle 11 blows off the chips adhering to the lower surface 6a of the pallet 6 and the pallet receiving surface 13. clean.

In addition, what is shown in FIG. 5 is the lower surface 6a of the pallet 6.
is formed on an inclined surface 16, and air injected from a receiving surface cleaning nozzle 11 is guided to the pallet receiving surface 13 by this inclined surface 16, so that the pallet receiving surface 13 can be cleaned more powerfully.

Furthermore, in the above-mentioned embodiment, the T-shaped upper end 8a of the clamp shaft 8 is fitted into the T-groove of the pallet, but it may be of a single-claw shape as shown in the publications cited as conventional examples.

Furthermore, in the case where the workpiece 7 is fixed to the pallet receiving surface 13 with the pallet clamp 1, instead of the pallet 6, the workpiece 7 may be directly clamped and fixed by the pallet clamp 1, or the workpiece 7 may be directly clamped and fixed by the pallet receiving surface cleaning nozzle 11. Of course, the air may be replaced with a fluid such as cleaning oil.

<Effects of the Invention> The present invention is constructed and operates as described above, and thus has the following effects.

B. The fluid ejected from the nozzle hole blows straight between the opposing surfaces of the receiving surface and the workpiece or workpiece pallet, so the fluid does not blow perpendicularly to the back surface of the workpiece and receive large resistance as in the conventional example described above. Chips can be powerfully removed without reducing the flying force.

(b) Chips adhering to the back side of the workpiece or workpiece pallet can be strongly and reliably blown away by the strong force of the fluid that blows straight through. Furthermore, the problem of the prior art example of the nozzle hole being blocked by chips being forced into the nozzle hole is completely eliminated.

C. Chips adhering to the receiving surface can be strongly and reliably blown away by the strong force of the fluid that blows straight through even while the back of the workpiece or workpiece pallet is still far from the receiving surface, and the workpiece, etc. When the back surface of the seat is seated on the receiving surface, it is possible to eliminate the possibility of biting between the seating surfaces.

D. The fluid ejected from the nozzle hole spreads with an appropriate opening angle and blows straight through the gap between the opposing surfaces of the workpiece, etc., and the receiving surface.
Since the range in which chips can be blown away is wide, the number of nozzle holes can be reduced and the processing cost can be reduced.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a longitudinal sectional front view of the clamping device, FIG.
FIG. 4 is a front view of the table, and FIG. 5 is a longitudinal sectional front view of main parts of another embodiment. 1... Pallet clamp, 2... Clamp body, 5... Table, 6... Work pallet, 7
... Workpiece, 8 ... Clamp shaft, 11 ... Reception surface cleaning nozzle, 13 ... Pallet reception surface, 17 ... Reception surface.

Claims (1)

[Scope of utility model registration request] A receiving surface 13, a clamp 1, and a receiving surface cleaning nozzle 11 are provided on a table 5 of a machine tool, and fluid ejected from the receiving surface cleaning nozzle 11 cleans the receiving surface 13 and the receiving surface of the workpiece 7 or workpiece pallet 6 facing it. In a workpiece fixing device for a machine tool, the clamp 1 is configured to blow off chips adhering to the workpiece 17, receive the workpiece 7 directly on the receiving surface 13 or via the workpiece pallet 6, and clamp the workpiece 7 with the clamp 1. A clamp shaft 8 is projected onto the clamp body 2, a receiving surface 13 is positioned on the lateral outer side of the clamp shaft 8, and a receiving surface cleaning nozzle 11 is installed on the circumferential surface of the clamp shaft 8.
is opened to face the receiving surface 13 from the side, so that the fluid ejected from the receiving surface cleaning nozzle 11 is blown through the receiving surface 13 and the receiving surface 17 of the workpiece 7 or the workpiece pallet 6 facing therefrom from the side. A workpiece fixing device for a machine tool characterized by the following configuration.