JP4524722B2 - Positioning stopper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a positioning stopper that is used in a chuck for gripping a workpiece and determines a position in the workpiece axial direction by contacting a reference surface in the axial direction of the workpiece.
[0002]
[Prior art]
Conventionally, a workpiece gripping chuck that is attached to the tip of a lathe spindle and grips a workpiece or is used as a jig for fixing a workpiece to a stationary member with respect to a rotary tool, the position of the workpiece in the axial direction is determined. In order to determine and chuck, a workpiece positioning device is provided on the front surface of the chuck body so as to abut against a reference plane in the axial direction of the workpiece. For example, in Japanese Utility Model Laid-Open No. 5-49207, a work stopper mounting base is fixed at a position facing each chuck claw mounting base provided to be movable in the radial direction at equal angular intervals in the circumferential direction. The thing which attached the workpiece | work stopper which supports a workpiece | work end surface (axial direction reference surface) to the front surface of the mounting base is disclosed.
[0003]
[Problems to be solved by the invention]
In the prior art, the work stopper mounting bases are separated from each other at the chuck center portion. Therefore, when the work stopper is arranged on the chuck center line, the work stopper is separated from the front surface of the chuck body on the chuck center line (floating). ) And the positioning accuracy when the workpiece axial reference surface is brought into contact with the stopper may be adversely affected. Further, since each work stopper mounting base is formed as an independent member, there is a problem that the number of parts increases and the number of assembling steps increases. Furthermore, by processing a plurality of work stopper mounting bases separately with different members, it is easy to cause a processing error between the thicknesses of the respective work stopper mounting bases. There is a problem that the dimension from the front surface of the chuck to the stopper surface of the work stopper tends to vary from one work stopper mount to another.
An object of the present invention is a positioning stopper of a type in which a stopper piece is attached to a stopper base, wherein the stopper piece position can be adjusted outward from the center of the stopper base, and the stopper piece is placed on the chuck center axis. It is an object of the present invention to provide a positioning stopper in which the stopper piece is reliably received by the chuck main body, reliably performs the stopper function, and can reduce the dimensional error from the front surface of the chuck to the stopper surface. Further, the present invention provides a configuration that reduces the number of parts and contributes to a reduction in assembly man-hours.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the positioning stopper of the present application is a positioning stopper that is attached to the front surface of the chuck body and contacts the reference surface of the workpiece to be chucked to position the workpiece in the axial direction, and opens and closes in the radial direction of the chuck body. A plurality of mounting arm portions extend outward from the center of the base so that they are positioned between the jaws provided so as to be continuous with the front surface of the mounting arm from the center of the base. a stopper base formed with, e Bei and a stopper piece which is attached to the stopper base, in the positioning stopper comprising mounting adjustably the extending direction position of the mounting arm portion stopper piece to the stopper piece mounting surface, said stopper On the piece mounting surface, many along the length of the mounting arm from the center of the base coinciding with the chuck center axis A stopper piece mounting screw hole is provided, and the stopper piece is formed with an inclined surface with the center of the width of the stopper piece as a vertex for discharging chips on the inner part in the chuck radial direction when attached to the stopper base. It is characterized by being . As a result, since the stopper piece mounting surface is provided continuously from the center of the base to the front surface of the mounting arm, if there is an axial reference plane at the center of the workpiece, the stopper piece can be attached to the center of the base. The stopper piece is attached without being separated from the chuck body, and can reliably function as a stopper. Further, since the position of the stopper piece in the chuck radial direction can be changed, the stopper piece can be reattached to the position corresponding to the change in the radial position of the reference surface of the workpiece. In addition, since the stopper base is a single member, the thickness of the stopper base can be processed without error between the mounting arm portions, and the axial position of the front surface (stopper surface) of the stopper piece when the stopper piece is attached. The variation can be kept small, and the number of parts is also reduced. Moreover, the chips that have entered the radially inner side of the stopper piece are easily discharged by the centrifugal force generated by the chuck rotation. Instead of the screw hole, a T-groove extending in the radial direction along the stopper base is formed, and the stopper piece is fixed at a desired radial position by using the T-groove and the T-groove nut. Also good.
[0005]
Specifically, the attachment arm portion is provided with an attachment portion to the chuck that is displaced from the attachment arm portion in the chuck circumferential direction. According to this, it can utilize as a stopper piece attachment surface to the front-end | tip of an attachment arm part. Each attachment arm portion is provided with only one attachment portion (claim 3). Further, the mounting arm portion has a length that reaches the outer periphery of the chuck main body in the chuck mounting state. According to this, attachment to a chuck | zipper can be performed using an attachment part. Further, the stopper piece can be positioned up to the vicinity of the distal end of the stopper base in the radial direction (or outside of the stopper base), so that the workpiece having a reference surface near the outer diameter of the chuck body can be handled.
[0007]
Scan Toppapisu the inner chuck radial direction in a state attached to the stopper base, it may inclined surface for chip discharge the portion serving as the outside is formed (claim 5). According to this, even if the direction of the stopper piece is reversed and used in the radial direction, the chip discharging function can be maintained.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described with reference to FIGS. A plurality (three in this case) of master jaws 2 are directed to the chuck body 1 at equal angular intervals in the circumferential direction so as to be movable in the radial direction. The master jaw 2 opens and closes in the radial direction of the chuck body 1 by the axial movement of a claw operating member (for example, a wedge plunger) in the chuck body 1. A base jaw 3 is attached to the front surface of the master jaw 2. An insert jaw 4 is attached to the front surface of the base jaw 3. A radially inner side surface of the insert jaw 4 serves as a grasping surface 5, and the outer diameter of the workpiece W is grasped.
[0009]
A positioning stopper 10 according to the present application is attached to the front surface 1 a of the chuck body 1. The stopper base 11 has a base central portion 12 disposed in the central portion of the chuck front surface 1a in the mounted state, and a plurality of (three) mounting arm portions 13 extending radially outward from the base central portion 12 in the chuck radial direction. Are integrally molded and formed into one member. The mounting arm portions 13 are arranged at equiangular intervals in the circumferential direction. When attached to the chuck main body 1, the mounting arm portions 13 are arranged between the master jaw 2 and the master jaw 2 and have a length reaching the outer periphery of the chuck main body 1. It has become. One mounting portion 14 is integrally formed at the tip of the mounting arm portion 13 at a position offset in one direction of the chuck circumferential direction from the mounting arm portion 13, and the mounting portion 14 has one counterbore hole (bolt mounting). Hole) 15 is formed.
[0010]
The base central portion 12 and the mounting arm portions 13 are formed on the same plane where the front surfaces (surfaces opposite to the chuck front surface 1 a in the chuck axis direction) are continuous as the stopper piece mounting surface 16. Since the stopper piece mounting surface 16 is processed at a time, the thickness (in the axial direction) of each mounting arm portion 13 of the stopper base 11 is formed uniformly among the arm portions 13. From the base center CL, which is on the chuck center axis in the chuck mounting state, to each mounting arm portion 13, a bolt hole (mounting screw hole) 17 for stopper mounting is provided along the length of the mounting arm portion 13 (chuck in the mounting state). In the radial direction), a large number of bolt holes 17 are provided at a predetermined pitch, and the mounting portion 14 is shifted to one side in the circumferential direction of the chuck. .
[0011]
A stopper surface 21 slightly protrudes from the front surface of the stopper piece 20, and this stopper surface 21 is provided at a position biased to one end side in the radial direction of the stopper piece 20 in the attached state. The pitch of the two counterbore holes 22 formed in the stopper piece 20 matches the pitch of the bolt hole 17, and the stopper piece 20 is attached to the mounting surface 16 of the stopper base 11 via the counterbore hole 22 and the mounting bolt 23. The chuck radial direction position (position in the extending direction of the mounting arm portion 13) can be appropriately changed and fixed. The radially inner and outer portions of the stopper piece 20 in the attached state have the width center of the stopper piece 20 as an apex in the outer portion, and the inwardly inclined surface 24, and the width center of the stopper piece in the inner portion as an apex, It is formed on the inclined surface 25 that faces outward. When the stopper piece 20 is attached as shown in FIG. 1, even if chips generated during processing enter the radially inner space of the three stopper pieces 20 on the back side of the workpiece W, Due to the centrifugal force, it is discharged along the inclined surface 25 on the radially inner side of the stopper piece 20 to prevent clogging of chips. When the inside and outside of the stopper piece 20 in the radial direction are exchanged as shown in FIG. 3, the inclined surface 24 functions as a chip discharge surface. Needless to say, the thickness of the stopper piece 20 is appropriately set with respect to the position of the reference surface W1 of the workpiece W in the axial direction. In FIG. 3, since the stopper surface 21 is mounted on the outer side in the radial direction by using the two mounting screw holes 17 at the distal end portion of the arm portion 13, the stopper surface 21 is positioned outside the chuck outer diameter. This corresponds to the case where the radial position of the reference surface W1 of the workpiece W is larger than the chuck outer diameter.
[0012]
In addition to the shape described above, the stopper piece 20 may be a stopper bolt 30 having a head formed on the stopper portion 31 as shown in FIG. Since this stopper bolt 30 is attached to the stopper base 11 by the slack prevention nut 32 so that the protruding length can be adjusted, it is possible to easily cope with the change in the axial position of the reference surface W1 of the workpiece W.
In order to attach such a stopper base 11 to the chuck body 1, three attachment screw holes 40 are machined on the front surface of the chuck body 1 at positions corresponding to the three bolt attachment holes 15 of the stopper base 11. Then, the stopper base 11 is fixed using the mounting screw hole 40 so that the back surface thereof is in close contact with the front surface 1a. Since the stopper base 11 having the three arm portions 13 is composed of a single member, the mounting bolt 41 required for attaching the stopper base 11 to the chuck body 1 is separated from the three stopper bases as in the prior art. It can be reduced compared with the case of attaching to the. In this embodiment, one arm is attached to each arm 13 and a total of three are attached.
[0013]
Then, the stopper piece 20 is attached to the stopper base 11 in accordance with the radial position of the reference surface W1 of the workpiece W. When the radial position of the reference surface W is changed, the stopper piece 20 is fixed at a position corresponding to the appropriate bolt hole 17. In particular, when there is a reference surface W1 of the workpiece W on the chuck center line CL, the stopper base 11 of the present application has a mounting screw hole 17 at the center of the base central portion 12; When the cylindrical stopper piece 20A such as 5 is fixed, the back surface (side surface of the chuck body 1) of the stopper piece 20A comes into close contact with the stopper mounting surface 16 of the stopper base 11, so that the reference surface of the workpiece W applied from the front of the axis line The position in the axial direction can be positioned by reliably receiving W1.
[0014]
In this embodiment, the stopper base corresponding to the three-claw chuck has been described. However, even if the number of claws is changed, such as a two-claw chuck and a four-claw chuck, it can be dealt with by using a topper base shape corresponding to the change. Of course, the present invention can also be applied to a chuck whose inner diameter is grasped.
[0015]
【The invention's effect】
As described above, in the positioning stopper of the present invention, since the stopper piece mounting surface is continuously formed between the center of the stopper base and the mounting arm portion, the stopper piece can be securely attached even when the stopper piece is attached to the center portion. it can. In addition, since the stopper base having a plurality of mounting arm portions is composed of a single member, the number of parts can be reduced as compared with the conventional structure, and the number of assembling steps can be reduced. Further, by using a single member, the stopper base thickness can be made constant without error between the mounting arm portions, and variations in the positioning position in the axial direction by each stopper piece can be reduced. In addition, it can be easily adapted to changes in the radial position of the workpiece reference surface, and is highly versatile.
[Brief description of the drawings]
FIG. 1 is a front view of a chuck to which a positioning stopper of the present application is attached.
FIG. 2 is a diagram illustrating a main part of a cross section taken along line II-II in FIG. 1;
FIG. 3 is a front view of a main part in a state where the stopper piece is mounted in the outermost position in the chuck radial direction with the direction of the stopper piece reversed.
FIG. 4 is a view in which another stopper piece is attached.
FIG. 5 is a view in which another stopper piece is attached.
[Explanation of symbols]
1 Chuck body 1a Chuck body front surface 2 Master jaw 3 Base jaw 4 Insert jaw 11 Stopper base 12 Base center portion 13 Mounting arm portion 14 Mounting portion 16 Stopper piece mounting surface 17 Mounting screw hole 20 Stopper piece 24/25 Inclined surface W Work W1 Reference plane

Claims (5)

A positioning stopper that is attached to the front surface of the chuck body and contacts the reference surface of the workpiece to be chucked to position the workpiece in the axial direction, between the jaws provided to open and close the chuck body in the radial direction. A plurality of mounting arms extending outward from the center of the base, and a stopper base having a stopper piece mounting surface continuously formed from the center of the base to the front of the mounting arm, and the stopper base e Bei the attached stopper piece, the positioning stopper comprising mounting adjustably the extending direction position of the mounting arm portion stopper piece to the stopper piece mounting surface, the stopper piece mounting surface, coincides with the chuck center axis A number of stopper piece mounting screw holes are provided along the length of the mounting arm from the center of the base, and Papisu the positioning stopper, characterized in that the state attached to the stopper base for chip discharge the portion to be the inner chuck radial, inclined surfaces whose vertices width center of the stopper piece is formed. The positioning stopper according to claim 1, wherein the attachment arm portion is provided with an attachment portion to the chuck that is displaced from the attachment arm portion in the circumferential direction of the chuck. The positioning stopper according to claim 2, wherein each of the attachment arm portions has only one attachment portion. The positioning stopper according to claim 1, wherein the mounting arm portion has a length that reaches the outer periphery of the chuck body in a chuck mounting state. The positioning stopper according to any one of claims 1 to 4 , wherein the stopper piece is formed with inclined surfaces for discharging chips at portions on the inner side and the outer side in the chuck radial direction in a state of being attached to the stopper base.

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