JPH0453842Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a structure for attaching a free jaw to an automatic chuck of a machine tool.

(Prior Art) Conventionally, chucks operated by hydraulic pressure or pneumatic pressure in machine tools have three slide pieces 2 on a chuck body 1, as shown in FIGS. 3 to 5.
The slide piece is provided so as to be slidable in the radial direction at an angle of 120°, and the slide piece is moved by about 5 mm using hydraulic or pneumatic pressure, and the slide piece 2 has a T-shaped groove 3 and an opening of the T-shaped groove. A stripe 4 consisting of triangular protrusions is provided on both sides in a direction perpendicular to the groove 3 at an equal pitch, for example, 1.5 mm, and a T-shaped tightening key 5 is slidably inserted into the T-shaped groove 3. The tightening key 5 is provided with a screw hole 7 for attaching a free claw 6. The raw jaw 6 is machined with a stepped portion 8 that contacts the workpiece, and similar stripes 9 are provided on both sides of the back surface to engage with the stripes 4 of the slide piece 2, and the slide piece 2 is positioned at a predetermined position according to the diameter of the workpiece. The stripes are aligned and positioned, the mounting bolt 10 is screwed into the screw hole 7 of the tightening key 5, and the edge 11 of the slide piece 2 is tightened and fixed.

For this reason, the dimensions of the workpiece to be machined may change,
If the raw jaw has worn out and is to be replaced with a raw jaw that has a step that matches the diameter of the workpiece, the tightening key 5 will be freed by removing the raw jaw 6 and slide within the T-shaped groove 3, and when the next raw jaw is attached. In each case, it is necessary to adjust the position of the key and the raw claw so that the stripes at the predetermined dimension positions mesh with each other. In addition, at this position, the key 5 must be tightened with the mounting bolt 10 while keeping the line 9 of the raw claw 6 and the line 4 of the slide piece 2 in place, and the three slide pieces It is necessary to align the positions of each other, which is troublesome and takes a long time to set up, which has the drawback of reducing productivity, especially when a large number of different types are used.

For this reason, Utility Model No. 51-141873 or Utility Model No. 141873
63-124407, as shown in FIG. 6, streaks 12 and 13 are provided on both sides, and an auxiliary jig 15 fixed to the tightening key 5 with a fixing bolt 14 is provided,
A two-stage type has been proposed in which the raw nail 6 is attached to the auxiliary jig 15 by engaging the lines 13 and 9 and attaching it to the screw hole 16 via the mounting bolt 17, in order to simplify the work when replacing the raw nail. There is.

Moreover, in Utility Model Application Publication No. 59-1837056, the base of the chuck, that is, the slide piece, has a radial protrusion 7 and stripes on both sides of the chuck, and the chuck is fitted with the protrusion and the stripe to be attached with a bolt. A chuck holder is provided, and a chuck holder is shown in which the chuck holder is inserted and attached in the radial direction.

[Problem to be solved by the present invention] However, by providing the auxiliary jig 15,
Due to the tiered format, the structure is complicated and large,
The work of attaching the auxiliary jig 15 is done using the conventional natural nails 6.
It requires the same effort as installing the
It is necessary to measure and install the mounting position of the auxiliary jig.

Furthermore, a device in which a natural nail is inserted into a holder attached to a slide piece requires a hole for holding the natural nail in the holder and a device for holding the natural nail, which has the disadvantage that the holder becomes complicated and large.

(Purpose) In consideration of the above points, the present invention saves the trouble of attaching an auxiliary jig, attaches the free jaw directly to the slide piece of the chuck body, and eliminates the need to adjust the attachment position with the slide piece during installation, reducing setup time. It is designed to shorten the .

(Means for solving the problem) For this reason, a plurality of screw holes are arranged in parallel in the sliding direction at the bottom of the groove provided in the slide piece, and the step part of the natural jaw is pre-aligned with the same predetermined position as the slide piece. The threads of the raw jaw can be placed in the specified position on the slide piece by aligning and tightening the mounting bolt hole of the raw jaw and the specified screw hole of the slide piece when attaching the raw jaw to the chuck body. It is designed to mesh with the lines of the

(Function) Therefore, by simply selecting and attaching the screw hole of the slide piece when attaching the natural nail, the attachment position of the natural nail can be engaged with a predetermined line of the slide piece and tightened and fixed.

(Example) This will be described with reference to an example shown in FIGS. 1 and 2.

1 is a chuck body, and a slide piece 2 is fitted in the chuck body so as to be moved in the radial direction by hydraulic or pneumatic pressure, and this slide piece 2 is provided with a groove 20 and stripes 4 on both sides of the opening of the groove, and the bottom surface of the groove is A plurality of screw holes 21a, 21b, 21c, 21 are provided at predetermined intervals.
d and 21e are provided. Reference numeral 6 has a step part 8 machined with a raw nail, and has two mounting bolt holes 22 at the same interval as the predetermined screw hole interval, and has a groove on the back surface that contacts the slide piece 2 with the same width as the groove 20 of the slide piece. The groove 23 and the stripes 4 are formed on both side edges of the groove.
There is a line 9 that meshes with the groove. 24 is an auxiliary key inserted across the groove 20 of the slide piece 2 and the groove 23 of the free claw 6, and 25 is a tightening bolt.

The stepped portion 8 of the green jaw 6 is machined in advance to match the predetermined screw hole position of the slide piece 2 according to the machining diameter. Therefore, when changing the workpiece diameter, first Then, remove the free claws 6 that are attached to the screw holes 21a and 21c of the slide piece 2 from the slide piece 2 by removing the mounting bolts 25, and insert the free claws 6 with separate small diameter steps 8 into the grooves 23. By fitting the auxiliary key 24 and aligning the axis with the slide piece 2, and attaching the tightening bolt 25 inserted into the mounting bolt hole 22 to the screw hole 21b, 21d at a position corresponding to the diameter of the workpiece, the free jaw can be removed. The line 9 of 6 can be matched with the line 4 at a predetermined position of the slide piece 2, and the stepped portion 8 can be held at a position with a required diameter.

Although the distance between the screw holes of the slide piece 2 is the same in the illustrated embodiment, the pitch is changed sequentially, and the distance between the mounting bolt holes 22 of the free jaw 6 is changed depending on the diameter of the stepped portion 8. If you do this,
When attaching the free jaw 6, if the position is not in accordance with the diameter, the mounting bolt hole 25 of the free jaw 6 will not match the screw hole of the slide piece 2, and it can be prevented from being attached in the wrong position.

(Effects of the present invention) As described above, the present invention includes a slide piece that slides on the chuck body using hydraulic or pneumatic pressure, provides stripes on both sides of the groove that opens on the surface of this slide piece, and has a plurality of screws. By arranging holes in parallel in the sliding direction and inserting the mounting screw by aligning the mounting bolt hole of the raw jaw with the screw hole at the position corresponding to the diameter of the workpiece, the line made on the raw jaw can be aligned with the line at the specified position on the slide piece. It can fit into your eyes,
It is possible to cause the lines to engage with each other at a position that corresponds to the diameter of the workpiece without measuring the attachment position of the raw jaw. Therefore, by simply selecting and tightening the screw hole provided on the slide piece with the mounting bolt for the natural claw, the natural claw can be installed in the specified position, and each time it is installed, the position of the line should be measured. There is no need to position the natural nail,
This simplifies the installation and replacement of the raw jaws, significantly shortens setup work time, and has the effect of improving productivity.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view showing essential parts in an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1,
Figure 3 is a front view of a chuck showing a conventional example;
The figure is a side sectional view equivalent to figure 1 in the conventional example, and figure 5.
The figure is a sectional view taken along the line BB in FIG. 4, and FIG. 6 is a side sectional view showing another embodiment. 1 is the chuck body, 2 is the slide piece, 3 is the T-shaped groove, 4 is the line, 5 is the key, 6 is the raw claw, 7 is the screw hole, 8 is the step, 9 is the line, 20 is the recess of the slide piece Grooves, 21a...21e are screw holes, 22 are mounting bolt holes, 23 are grooves, 24 are auxiliary keys, 2
5 is a mounting bolt.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A slide piece that is attached to the chuck body so as to be able to slide in the radial direction within a certain range by hydraulic or pneumatic pressure, and that has stripes for positioning on both sides of the surface, and The stepped portion is machined, and a raw nail with a stripe that engages with the stripe is provided on both edges of the back surface, and the raw nail and the slide piece are positioned by engaging the stripe with each other, and fixed with a mounting bolt. In an automatic chuck for a machine tool, the slide piece has a groove in the sliding direction that opens on the surface, a plurality of screw holes arranged in parallel in the sliding direction at the bottom of the groove, and a groove on both sides of the groove opening. A groove with the same width as the groove on the slide piece is provided on the back side of the natural nail, and a groove on both sides of the opening that engages with the groove on the slide piece, and a groove between the slide piece and the natural nail. An auxiliary key is provided that fits across the
An automatic chuck for a machine tool, characterized in that a mounting bolt provided on the raw jaw is attached to a predetermined screw hole of the slide piece via an auxiliary key depending on the diameter of the raw jaw. 2. Claim 1, wherein the threaded holes of the slide piece are provided with sequentially changing pitches, and the bolt holes for attaching the free jaws are provided at different intervals depending on the diameter.
Automatic check of the machine tools listed.