JPS59192404A - Jaw setting device for rotary chuck - Google Patents

Abstract

PURPOSE:To make a relative position between a jaw and a jaw nut maintainable in a constant manner even in time of the chucking diametral changing of a rotary chuck, by installing a positioning member in one side of either the jaw or the jaw nut as well as installing an engaging hole linking this member in the other side. CONSTITUTION:In case of a device that attaches a master jaw 3 to a chuck body 1, which jaw 3 is slidably fitted in a radial guide groove 2 of the chuck body and that attaches a jaw 5 to this master jaw 3 in a state of serrations 3a and 5a being engaged through bolts 6 and 6, a fitting hole 9 is bored in front of a jaw nut 10 to be fitted in a T-groove 4 formed in the master jaw 3 and then a positioning pin 8 is forcibly pressed in this hole 9. In addition, a round engaging hole 12 where this pin 8 is fitted in the backside of the jaw 5 is formed up. And, in time of changing a radial position of the jaw 5 as the diameter of a workpiece is changed, any variation in a relative position between the jaw nut 10 and the jaw 5 is made so as to be preventable by means of the positioning pin 8.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a rotary chuck mounting device.
3. More specifically, it relates to a device that is attached using a mounting bolt and a mounting bolt.

Prior art and its problems In many rotary chucks, the conventional mounting device is a master mounting device 103, as shown in FIG.
A jaw nut 110 is fitted into a T-groove 102 in the radial direction of the chuck formed in the chuck, and a serration 103a is carved on the front surface of the master jaw 103.
03a and the serrations 105a on the back surface of the holder 105 are engaged with each other, and the holder 105 is integrally attached to the master holder 103 using bolts 106 and 106 for attaching the holder. According to such a mounting device, since the jaw 105 is engaged with the master jaw 103 through the serrations 103a and 05a, it is positioned in the radial direction of the rotary chuck even when the jaw is replaced, resulting in extremely uneven attachment/detachment. Although small, there is a fairly large gap between the bolt hole 107.107 for mounting and the bolt 106.106 for mounting (for example, the bolt hole 106.106 for mounting
If 6 is a 12mm screw, bolt hole 10 for show mounting
7, 107 is about 2 mm in diameter. ) When replacing the jaws as described above or moving the jaws in the radial direction of the rotating chuck to change the grasping diameter, the jaw nuts 110 will vary in the radial direction of the rotating chuck by the amount of the gap. The jig nut I-110 is mounted on the chuck body, and the balance varies greatly. Especially in machine tools that require high-speed rotation, unbalance occurs due to variations in the mounting position of the jig nut I-110, and the chuck body
Even if the balance is improved (not including the adjustment device),
There was a risk that vibration etc. would occur.

Outline and Purpose The present invention aims to eliminate the drawbacks of the conventional devices described above, by providing a positioning member on one of the jaws and the nut, and on the other member, a locking hole or a locking member that engages with the positioning member. A groove is formed, and the positioning member is locked in this locking hole or locking groove to position the bolt in the radial direction. When the position of the rotary chuck is changed, the relative position of the nut is not changed and the nut is installed without variation in the radial direction of the rotating chuck, which reduces the balance of the rotating chuck. It is an object of the present invention to provide a rotary chuck mounting device that can prevent vibrations and suppress the occurrence of vibrations, etc., especially during high-speed rotation.

1st Embodiment In FIGS. 1 to 4, ▪ indicates a chuck body, 2 indicates a radial master guide groove formed in the chuck body 1, and 3 is slidably fitted into this master guide groove 2. A T-slot 4 for attaching a mounting nut is formed in the master jacket 3 in the same direction (radial direction) as the sliding direction of the master jacket 3. Serrations 3a are engraved on the front surface of the master jacket 3 (the surface facing the serrations of the jacket 5, which will be described later, on the right side in FIG. 2). 5 is the bolt hole No. 1 for mounting the bolt at two locations, and hole 7.7 is drilled into the bolt hole 1 for mounting the bolt 6.6, and the pilot holes 7a and 7a for the bolt hole 7.7 for mounting the bolt The radial clearance between the counterbore holes 7b, 7b and the mounting bolt 6.6 is set to the same extent as in the conventional case. In addition, serrations 5a that engage with the serrations 3a of the master jacket 3 are carved on the back surface of the top jacket 5, and positioning pins 8 (described later) are provided on four parts 5b (facing the top jaw 10, which will be described later) at the center of the rear surface. A round locking hole 12 into which the tip of the locking hole 12 fits is provided. Reference numeral 10 denotes a mounting nut, which is slidably fitted into the T-slot 4 for mounting the mounting nut, and the tip of the mounting nut 10 is fitted into the recess 5b on the back surface of the socket 5 to adjust the circumferential position (rotation) of the mounting nut 5. (position in the direction orthogonal to the radial direction) on the chuck. A fitting hole 9 is formed in the front surface of the joint nut 10, and a positioning pin 8 is press-fitted into the fitting hole 9 to form an integral structure. As shown, it is formed into a diamond pin and protrudes from the front surface of the jacket 5 toward the rear recess 5b to constitute a positioning member. The tip of the positioning pin 8 and the locking hole 12 are connected to the radial gap (second
In order to reduce the influence on the overall balance of the chuck due to variations in the mounting device of the bolt 10 (vertical direction in the figure), the bolt hole (for example, JTS B
1176 reference, "Dimensions of counterbore and bolt holes for hexagon socket head bolts") is set to 1/4 or less of the gap that occurs when a bolt is fitted. Also, 11.
Reference numeral 11 indicates a screw hole for attaching the lever; 13 indicates a wedge plunger that engages with the wedge surface 14 of the master guide 3; 15 indicates a rotary cylinder, not shown; the wedge plunger 1
The connecting rod 16 is the main shaft of the machine tool, and the chuck body 11 is attached to this main shaft to rotate.

In such a configuration, when the diameter of the grasped object is changed, the operator loosens the bolt 6.6 for attaching the jaw, releases the mutual engagement between the serrations 3a and 5a of the jaw 5 and the master jaw 3, and removes the grasped object. Slide the bolt 5 together with the bolt 10 in the radial direction of the rotary chuck according to the diameter of the shaft, and tighten the bolt 6.6 for mounting the bolt at a predetermined position.

At this time, the relative position of the bolt 10 to the bolt 5 does not change due to the positioning pin 8, so if you change the grasping diameter of the rotary chuck by performing the above operation for all the positions of the rotary chuck, variations in the mounting position of the bolt 10 can be eliminated. There is almost no reduction in the balance of the rotating chuck.

Of course, in the case of this embodiment, the positioning pin 8 is placed in the position 5,
The locking hole 12 may be provided in the joint nut 10, or the tip of the first positioning pin 8 may be shaped like a round bottle, and the round locking hole 12 may be elongated in the circumferential direction. Several other embodiments will be shown below, but the same parts as in the first embodiment will be given the same numbers and their explanation will be omitted.

In FIGS. 5 and 6 of the second embodiment, 8A is formed on the front surface of the joint nut n910 with a rectangular cross section and a predetermined length in a direction perpendicular to the sliding direction of the joint nut 10 (vertical direction in FIG. 5). The convex portion 12A illustrated as a positioning member is a long hole shown as a locking hole formed in the rear surface concave portion 5b of the door 5, and the long hole 12A and the convex portion 8A are arranged as shown in FIG. It is set so that there is a gap in the longitudinal direction of the elongated hole 12A when both are locked. In addition, these convex portions 8A
The radial gap between the rotary chuck and the elongated hole 12A is set to be an extremely small gap as in the first embodiment.

In FIGS. 7 and 8 of the third embodiment, a recess 12B, which is exemplified as a locking hole, is formed on the back surface of the housing 5.
The front part 8B of the mounting nut 10, which is illustrated as a positioning member, is locked, and the mounting nut 1 is held against the mounting 5.
0 is positioned relative to the radial direction on the rotating chuck.

In this embodiment, movement of the jaw 5 in the circumferential direction Nα 10 is also prevented by locking the recess 12B and the front surface portion 8B of the jaw nut 1o.

4th Embodiment In FIGS. 9 and 10, a key groove 9C is cut in the center of the front surface of the jaw nut 10, and a parallel key 8C is press-fitted into this key groove 9C to form an integral structure. The positioning member is configured to protrude further toward the side of the door 5. As shown in Fig. 10, a fitting key groove 12C shown as a locking groove is cut in the middle of the fitting bolt hole 7.7 in the corresponding top fitting, and a parallel key 8C is engaged with this fitting key groove 12C. The bolt 10 is positioned relative to the bolt 5.

Fifth Embodiment In FIGS. 11 and 12, the lower hole of the bolt hole 7D of the bolt 5 of the bolt 5, which corresponds to one bolt 6 of the bolt 6 screwed into the bolt 10, is engaged. It is formed in the stop hole 7Da. This locking hole 7D
As shown in FIG. 12, a has an oval shape in the circumferential direction of the rotary chuck, and is set to have a small gap in the radial direction with respect to the outer diameter of the mounting bolt 6Nα 11 as in the first embodiment. By engaging the bolt 6 for mounting the bolt 6 with the locking hole 7Da, the bolt 10 is positioned relative to the bolt 5 in the radial direction of the rotary chuck. In this embodiment, the above-mentioned mounting bolt 6 constitutes a positioning member. In this embodiment, conventional bolts 6 can be used for mounting, so it can be implemented at a relatively low cost. Further, the counterbore hole 7Db of the bolt hole 7D for mounting the bolt is formed in the locking hole of the bolt 6 for mounting the bolt, and the locking hole is formed into an oval hole in the circumferential direction and the head of the bolt hole 7D in the radial direction. The bolt 10 may be positioned with a small gap formed in the locking hole, and the head of the bolt 6 for mounting the bolt 6 can be locked in this locking hole. Furthermore, the non-threaded part (shaft part between the head and the threaded part) other than the head of the mounting bolt 6 is a fitting shaft part having a larger diameter than the threaded part,
This fitting shaft portion may be locked in the lower hole 7Da of the bolt hole 7D for mounting the bolt of the shaft 5.

In FIGS. 13 and 14 of the sixth embodiment, the joint nut 10E is T
It consists of a letter-shaped nut portion, and is fitted into the opening 4a of the T-slot 4 of the master jacket 3 with a sufficient gap in the circumferential direction. A key 5E is fixed to the four rear surfaces 5b of the jacket 5. The key 5E engages with the opening 4a of the T-slot 4 of the master jacket 3 to position the jacket 5 in the circumferential direction. One key 5E portion of the bolt hole 7 for mounting is formed into a locking hole 7E with a small radial clearance from the bolt 6 for mounting.

Then, the mounting bolt 6.6 is attached to the mounting nut 10.
The bolt 5 and the bolt 10E are screwed together so that the relative positions of the bolt 5 and the bolt 10E do not change. In this embodiment, with such a configuration, the locking hole 7E can be made into a round hole, which can be easily machined.

In this embodiment, the bolt hole of the jaw nut IOE is used as the locking hole 7E, but of course the bolt hole 7a of the jaw 5 or the counterbore hole 7 is used as in the previous embodiment.
Part b can also be used as a locking hole.

n13 Seventh Embodiment As shown in FIG. 15, an elastic collar 7 made of rubber or sponge is inserted into the pilot hole 7a of the bolt hole 7 for mounting the bolt 5.
F is fitted, and its inner diameter forms a locking hole.

In the above embodiment, the relative position of the mounting nut in the rotating chuck in the radial direction is determined by one positioning member with respect to the rotating chuck. However, the mounting nut is divided into two parts in the radial direction of the rotating chuck, and each A positioning member may be provided for the jaw nut. Further, although the explanation has been made for two bolts for mounting, it is possible to implement the invention for more than two bolts in the same manner.

Effects As described above, the present invention provides a positioning member on one of the bolts and the bolt, and forms a locking hole or a locking groove in the other member to engage with the positioning member.
Since the positioning member is locked in this locking hole or locking groove to position the nut in the radial direction Nα 14 , the operator can change the grasping diameter of the rotary chuck when changing the workpiece. Even if you move or replace the bolt, the bolt and bolt can maintain their relative positions constant, and if you balance the rotary chuck body, the same amount of balance will be maintained even if the bolt is moved. It is possible to reproduce the goodness of
This method has the advantage that it is possible to eliminate the unbalanced state that occurs in the past when the mounting position of the jaw nut relative to the jaw changes, which is a problem especially when the rotary chuck rotates at high speed, and it is possible to perform highly accurate machining.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a rotary chuck to which the present invention is applied, Fig. 2 is a partially enlarged view of a portion of Fig. 1, and Fig. 3 is an A of Fig. 2.
Figure 4 is a diagram showing the head of the positioning pin, Figure 5 is a partial view of the second embodiment, Figure 6 is a rear view of the Figure 5, and Figure 7 is a diagram of the third embodiment. 8 is a back view of the door in FIG. 7, FIG. 9 is a partial view of the door in the fourth embodiment, FIG. 10 is a rear view of the door in FIG. 9, and FIG.
Actual 15: A partial view of the downstream side, Figure 12 is a rear view of the engine in Figure 11, Figure 13 is a partial view of the engine in the sixth embodiment, Figure 14 is a sectional view taken along line B-B in Figure 13, FIG. 15 is a partial view of the seventh embodiment, and FIG. 16 is a diagram showing a conventional device. 3... Master Master, 5... Master, 5E.
Key, 6... Bolt for mounting the bolt, 7... Bolt hole for mounting the bolt, 8... Locating pin, 8
A...Convex part, 8B...Front part of the nut,
8G...Parallel key, 9...Inset hole, 9C...Keyway, 10.10E...Jewel nut, 11...
Screw hole for mounting, 12... Locking hole, 12A...
- Long hole, 12B... recess, 12C... fitting keyway Patent applicant Howa Kogyo Co., Ltd. 25- Fig. 1 Fig. 3 10 5t) Fig. 21 26- Fig. 4 Fig. 5 Fig. 7 Figure 6B Figure 8/9rI! J Figure 11 Figure 10 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 1nl 1n? 1n'>p

Claims (1)

[Claims] 1. In a rotary chuck in which a jig is fixed to a master jig by a jig nut and a jig mounting bolt, a positioning member is provided on one of the jig and the jew nut, and a positioning member is provided on the other member. A locking hole or locking groove is formed to engage with the positioning member, and the positioning member is locked in the locking hole or locking groove to position the nut in the radial direction. A mounting device for rotating chucks. 2. The rotary chuck mounting device as set forth in claim 1, wherein the positioning member is a positioning pin fitted into a fitting hole of a bolt. 3. The rotary chuck mounting device according to claim 1, wherein the positioning member is constituted by a convex portion integrally formed on either the bolt or the bolt. Nα2 4. The rotary chuck mounting device according to claim 1, wherein the positioning member is constituted by a front surface portion of the mounting nut itself. 5. The rotary chuck mounting device according to claim 1, wherein the positioning member is constituted by a parallel key press-fitted into the keyway of the bolt. 6. Set the degree of fit between the bolt for mounting the bolt screwed into the bolt and the corresponding bolt hole for mounting the bolt in the bolt so as to position the bolt in the radial direction of the rotary chuck of the bolt with respect to the bolt, and 2. The rotary chuck mounting device according to claim 1, wherein the positioning member and the locking hole are respectively constituted by the bolt and the bolt hole for mounting the jig.