JPH06328305A - Work positioning stopper in lathe - Google Patents

Abstract

PURPOSE:To provide a work positioning stopper in a lathe in which adjustment of position of holding a work in a chuck is both extensive and rapid and deviation in work positioning does not occur during lathe operation. CONSTITUTION:A stopper holder 7 is fitted slidably in a hole of a fitting holder 6 fixed at a rear end of a lathe main spindle. It is then fixed by tightening a lock screw 10 for the fitting holder 6 at a fixation groove 13 for the stopper holder 7. A work stopper 8 for contact positioning a work 5 at its end face is installed detachably at a front end of the stopper holder 7. A spacer 9 to be inserted along inner surface of the main spindle is disposed in the middle of the stopper holder 7. Deviation of the stopper holder 7 within the main spindle in rotation is thus prevented due to the spacer 9. And, relative rotation of the stopper holder 7 and the fitting holder 6 is prevented due to the lock screw 10 engaging in its tip with the fixation groove 13 and so loosening of the lock screw 10 is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stopper for positioning an end surface of a rod which is inserted into a chuck when the rod is turned using a lathe.

[0002]

2. Description of the Related Art Conventionally, when a round bar or the like is processed by a lathe, a stopper for axially positioning an end surface of a workpiece is used on the spindle side of the lathe.

For example, as disclosed in Japanese Unexamined Patent Publication No. 63-105805, a threaded rod screwed into a chuck holder of a main shaft is projectingly provided in the holder, and the tip position of the threaded rod can be adjusted to an end surface of a workpiece. Those abutting and positioned, as seen in Japanese Utility Model Laid-Open No. 51-159091, via a pin fixed to a stopper provided in the main shaft so as to be movable back and forth,
The front end of the stopper inside the main spindle is adjusted by connecting with a nut screwed on the outer circumference of the main spindle.
There is known a collet chuck holder such as the one disclosed in Japanese Patent No. 167601 in which a rod-shaped stopper is provided and the front end position can be adjusted by a set screw at the rear end.

[0004]

However, with a structure in which the position of the front end of the stopper is adjusted by a screw depending on the workpiece, the position of the front end of the stopper can be securely fixed, but the position is greatly changed. In this case, the stroke of the screw has to be large, so that quick adjustment cannot be performed and the adjustable stroke is limited.

Further, as described in Japanese Utility Model Laid-Open No. 60-167601, which adjusts the front end position of the stopper by loosening the set screw, the adjustment can be performed quickly and the adjustment stroke can be increased. However, when the main shaft rotates at a high speed, the stopper vibrates and vibrates, and the set screw portion may loosen, so that the position of the front end of the stopper may not be securely fixed.

The present invention solves the problems of the conventional stoppers described above and enables quick adjustment so as to correspond to a wide range of positions of the end surface of the workpiece, chuck shapes of the lathe, and the like. Moreover, it is an object of the present invention to provide a novel work piece positioning stopper for a lathe in which the position of a work stopper that comes into contact with the end surface of a work piece and is positioned does not shift during lathe work.

[0007]

In order to achieve the above object, a first aspect of the present invention is to provide a mounting holder having a mounting portion detachable from a rear end of a spindle of a lathe and a penetrating hole, and a work stopper at one end. The stopper holder is detachably mounted, and is slidably inserted in the hole of the mounting holder, the hollow cylindrical spacer fitted in the intermediate portion of the stopper holder, and the fixing provided in the axial direction of the stopper holder. A work piece positioning stopper for a lathe is constituted by a groove and a set screw which is provided on a mounting holder and whose tip tightens a bottom portion of a fixed groove. Further, the second invention is attachable to and detachable from a rear end portion of a spindle of a lathe. A mounting holder having a penetrating female screw portion for holding the mounting portion and the stopper holder, and a male screw portion for screwing onto the female screw portion of the mounting holder is provided at one end and a female screw is provided at least at the other end. A hollow cylindrical stopper holder having a through hole provided, a work stopper having a male screw portion screwed to the female screw portion of the stopper holder, and a stopper holder screwed to the male screw portion of the work stopper. On the other hand, a lock nut for fixing the position of the work stopper and a means for fixing the screwing position of the stopper holder to the mounting holder constitute a workpiece positioning stopper for a lathe, and the work stopper and the stopper holder have different lengths. It is possible to selectively combine.

[0008]

In the first aspect of the invention, as shown in FIG. 1, the work stopper 8 abuts on the end face of the rod-shaped workpiece 5 which is inserted into the chuck 2 of the lathe and is sandwiched between the chuck 2 and the spindle 1. The position of the workpiece 5 in the axial direction is determined.

The stopper holder 7 supporting the work stopper 8 is adjusted in axial position with respect to the mounting holder 6 supporting the fixing groove 13 within the range of the fixing groove 13, and the set screw 10 is provided.
Fixed by. And even if the spindle 1 rotates, the set screw 1
Since 0 is engaged with the fixed groove 13, rotation of the stopper holder 7 is restrained with respect to the mounting holder 6, and
The spacer 9 attached to the intermediate position of the stopper holder 7 restricts the shake of the stopper holder 7, and prevents the set screw 10 from loosening due to vibration.

In the second invention, as shown in FIG. 4, a work stopper 8'is screwed to a mounting holder 6'through a hollow stopper holder 7 ', and the stopper holder 7'of various lengths and the work are held. By replacing and using the stopper 8 ',
The front end position of the work stopper 8'can be changed in a large range, and the work stopper 8'is hollow and has a light weight and high rigidity to reduce runout due to rotation of the spindle.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 shows an embodiment of the first invention. In the figure, a chuck 2 is provided on the front end side of a spindle 1 which is rotatably supported by bearings 3 and 4 on a lathe body.
Is attached and holds the rod-shaped workpiece 5.
The end surface of the workpiece 5 on the side inserted into the chuck 2 is brought into contact with the front end of a workpiece stopper 8 provided in the workpiece positioning stopper for lathes of the present invention, and its axial position is positioned.

The work stopper 8 is supported in the spindle 1 at its rear end by a mounting holder 6 mounted at the rear end of the lathe spindle 1 via a stopper holder 7. The spacer 9 fitted to the intermediate portion of the stopper holder 7 is fitted to the inner peripheral surface of the spindle 1.

The structure of the workpiece positioning stopper for a lathe shown in FIG. 1 will be described in more detail with reference to FIG. 2. The workpiece stopper 8 is for contacting the end surface of the workpiece 5 to position it, and has a substantially cylindrical front shape. And a rear mounting portion 14 defined by the collar portion 17.

The mounting portion 14 is a portion for inserting the work stopper 8 into a hole 16 formed at the front end of the stopper holder 7, and is mounted on the stopper holder 7 in a recess 15 provided on the side surface of the mounting portion 14. The work screw 8 is held at the front end of the stopper holder 7 by abutting the set screw 12. As for the collar 17, the mounting portion 14 is provided with a hole
It is for abutting against the front end surface of the stopper holder 7 when it is inserted into and to align the recess 15 on the side surface of the mounting portion 14 with the set screw 12.

Various lengths and diameters of the work stopper 8 may be prepared and selectively used according to the length and diameter of the workpiece 5 or the shape of the rear end of the chuck 2. . In that case, the shape of the mounting portion 14 should be the same regardless of the length and diameter of the work stopper 8,
The stopper holder 7 is adapted to fit in the hole 16.

The stopper holder 7 has a fixing groove 13 formed in its rear portion. The fixing groove 13 is for receiving the tip of a set screw 10 provided in a mounting holder 6 described later to change the axial position of the stopper holder 7. The stopper holder 7 may have a hollow inside to reduce the weight, and similarly to the work stopper 8, various lengths may be prepared and replaced as needed.

A spacer 9 is fixed to the intermediate portion of the stopper holder 7. The spacer 9 has a hollow cylindrical shape, the outer diameter of which is adapted to the inner diameter of the main shaft 1 of the lathe to be used, and the inner diameter of which is fitted to the stopper holder 7. The spacer 9 can be fixed to the intermediate position of the stopper holder 7 by a set screw 11 so that the position can be adjusted.

Further, the fixed groove 13 may be extended to the front of the stopper holder 7 so that the tip of the set screw 11 is received in the groove. Further, the spacer 9 can be attached to the stopper holder 7 by fixing its position with a fixing pin or the like instead of the set screw 11.

The attachment holder 6 is attached to the rear portion of the stopper holder 7. The attachment holder 6 is provided with a set screw 10 for fixing the stopper holder 7, and the tip of the set screw 10 is projected to the inner surface of the hole 6 a for inserting the stopper holder 7. The outer diameter of the front portion of the mounting holder 6 is smaller than that of the rear portion, and this portion is fitted and fixed in the hole at the rear end portion of the main shaft 1.

The mounting means for mounting the mounting holder 6 on the main shaft 1 may be fixed in the radial direction of the main shaft 1 using a set screw, or a female screw portion may be formed on the inner surface of the hole at the rear end of the main shaft 1. A male screw portion may be formed on the outer circumference of the front portion of the mounting holder 6 and screwed together. Further, as shown in FIG. 3, the outer diameter of the front portion of the mounting holder 6 is increased to form a female screw portion 19 on the inner surface thereof, and a male screw portion 19a is formed on the outer peripheral portion of the rear end of the spindle 1. It is also possible to screw it on.

Next, FIG. 4 shows an embodiment of the work piece positioning stopper for a lathe according to the second invention. In this embodiment, the mounting holder 6'has its front portion as in FIG. (A part to be attached to the lathe main shaft 1) is larger than the outer diameter of the rear part, and an inner female thread part for screwing the inner surface thereof to a male thread part formed on the outer periphery of the rear end part of the main shaft 1. 19 is formed. The mounting holder 6'is provided with a female screw portion 20 penetrating in the axial direction at the center thereof.

A stopper holder 7'is attached to the rear portion of the attachment holder 6 '. The stopper holder 7'is hollow, and the female screw portion 20 of the mounting holder 6'is provided on the front side of the outer surface thereof.
A male screw portion 21 for screwing is provided, and the collar portion 18 is brought into contact with the rear end surface of the mounting holder 6'to be positioned and the stopper holder 7'is fixed to the mounting holder 6 '. Although not shown, as a means for fixing the screwing position of the stopper holder 7'to the mounting holder 6 ', instead of providing the collar portion 18, a lock nut is screwed onto the male screw portion 21 to fix the mounting holder 6'. It may be configured to be tightened on the rear end surface.

A female screw portion 22 is formed on the inner surface of the stopper holder 7 '.
Are formed. The female screw portion 22 is formed over the entire length of the inner surface of the stopper holder 7 ′ as shown in FIG. 4, or when the stopper holder 7 ′ is long, only the rear portion thereof may be partially formed.

A work stopper 8'is attached to the stopper holder 7 '. The work stopper 8'is rod-shaped, and a part of the outer circumference thereof is provided with a male screw portion 24 that is screwed into a female screw portion 22 formed on the inner surface of the stopper holder 7 '.

The work stopper 8'is a stopper holder 7 '.
After being screwed to adjust the position, the lock nut 30 fixes the position. The stopper holder 7'and the work stopper 8'are prepared in several kinds of lengths, and are replaced according to the length of the workpiece 5.

Further, the one shown in FIG. 4 is a distance L from both end faces of the work stopper 8'to the male screw portion 24.
1 and L2 are different, and the front and rear are reversed according to the length of the workpiece 5 so as to correspond to two types of lengths, but the male screw portion 24 is provided on one side of the work stopper 8 '. It may be formed close to each other, and only the other end surface may be used as the contact surface of the workpiece 5.

FIG. 5 shows another embodiment of the second invention. The structure shown in FIG. 5 is also applicable to a case where the workpiece 5 projects particularly rearward of the chuck, and a guide tube 25 arranged in the spindle 1 is mounted in front of the mounting holder 6 ′. It is a thing.

The guide tube 25 has a hollow shape and guides and holds the workpiece 5 and restricts the workpiece 5 from swinging around during lathe work. The male screw portion 27 formed on the outer peripheral surface of the rear end portion of the guide tube 25 is provided. It is adapted to be screwed with the front side portion of the female screw portion 20 of the mounting holder 6 ′, and the front end surface of the stopper holder 7 ′ screwed from the rear of the mounting holder 6 ′ and the rear end surface of the guide tube 25 are tightened. The position is fixed by abutting in this state. It is preferable to use a soft metal such as brass or aluminum for the guide tube 25 so as not to damage the work piece 5.

In this embodiment, the guide tube 25 is attached to the front of the attachment holder 6 ', and a long stopper holder 7'is used so that the front end face of the work stopper 8'is attached to the attachment holder 6'. 'It is composed of the same parts as the embodiment shown in FIG. 4 except that it is located rearward, and the end face of the workpiece 5 is projected beyond the rear end of the lathe spindle 1. In this case, the workpiece 5 is held and guided by the inner wall of the guide tube 25 inside the lathe main spindle 1 and by the inner wall of the stopper holder 7'in the rear position of the main spindle 1 and attached to the rear of the stopper holder 7 '. The structure is such that the front end face of the stopper 8'positions and fixes.

FIG. 6 shows still another embodiment of the second invention. In this embodiment, an intermediate guide 26 for preventing the workpiece 5 from swinging is further mounted in the mounting holder 6'shown in the embodiment of FIG. Female screws 27 and 28 having the same pitch are formed on the inner peripheral surfaces of the stopper holder 7 ′ and the portion of the guide tube 25 that is screwed to the attachment holder 6 ′.

The intermediate guide 26 has a hollow cylindrical shape having a guide hole 29 penetrating in the center thereof and an external thread 30 formed on the outer peripheral surface thereof and adapted to the internal threads 27 and 28. The intermediate guide 26 is screwed inside the attachment holder 6 ′ across the stopper holder 7 ′ and the guide tube 25.

The work 5 having a small diameter is inserted through the guide tube 25 into the guide hole 29 of the intermediate guide 26, and the end portion of the work stopper 8'is screwed to the rear end of the stopper holder 7 '.
Is abutted against and positioned. Further, the intermediate guide has an outer diameter adapted to the inner diameter of the female screw portion 20 of the mounting holder 6 ', and may be fixed by sandwiching it between the rear end surface of the guide tube 25 and the front end surface of the stopper holder 7'. Good.

According to the work piece positioning stopper for a lathe of the present invention, it is possible to make a quick adjustment so as to correspond to a wide range of positions of the end surface of a work piece, a chuck shape of a lathe, and the like. It is possible to obtain the effect of preventing the position of the work stopper, which comes into contact with the end surface of and is positioned, from being displaced during lathe work.

According to the first aspect of the invention, the stopper holder is provided with the fixing groove in the axial direction in order to fix the stopper holder to the mounting holder so that the position of the stopper holder can be adjusted in the axial direction. Since the bottom of the fixing groove is tightened, the stopper holder does not rotate with respect to the mounting holder.

Further, since the spacer is provided at the intermediate portion of the stopper holder, the stopper holder does not swing around during rotation in the main shaft even when the stopper holder is used by projecting forward longer than the mounting holder. The holder and the end surface of the work piece will not be damaged, the set screw will not come loose during lathe work, the position of the contact surface of the workpiece stopper with the work piece will not shift, and the position of the contact surface will be within a large range. You can change and adjust quickly.

Further, since the work stopper at the tip of the stopper holder can be easily replaced with one having various diameters and different lengths, it is possible to cope with chuck shapes and workpiece sizes of various lathes.

According to the second aspect of the invention, all the connecting portions between the parts such as the work stopper, the stopper holder, and the mounting holder that constitute the workpiece positioning stopper for the lathe are screw-connected, and the length of a small range is obtained at this portion. Adjustable and various combinations of work stoppers, stopper holders, etc. of various sizes allow the contact position between the work stopper and the workpiece to project from the position near the chuck in the spindle to the rear of the spindle. It is possible to quickly change and adjust in a wide range of the position.

Further, since the hollow stopper holder is used, the rigidity thereof can be increased as compared with the weight, so that even when the stopper holder having a long dimension is used, the deflection of the work stopper during the rotation of the spindle can be reduced. In addition, it also functions as a control member that prevents bending of the workpiece.

When the contact position between the work stopper and the work is largely separated from the rear of the chuck, the guide pipe is attached to the front end of the attachment holder to prevent the work from bending in the main shaft. Is restricted, it is possible to prevent the workpiece from swinging around inside the rotating spindle and being damaged, and incomplete contact with the workpiece stopper.

Further, by mounting the intermediate guide between the guide tube and the stopper holder, even a thin and easily bendable work piece is prevented from swinging during rotation of the spindle, and damage to the work piece is prevented. It

[Brief description of drawings]

FIG. 1 is a sectional view of a workpiece positioning stopper for a lathe according to a first aspect of the invention.

FIG. 2 is an exploded perspective view of a workpiece positioning stopper for a lathe according to the first invention.

FIG. 3 is a cross-sectional view showing another aspect of the mounting holder.

FIG. 4 is a sectional view of a workpiece positioning stopper for a lathe according to a second invention.

FIG. 5 is a cross-sectional view of a work piece positioning stopper for a lathe according to a second aspect of the invention, in which a guide tube is mounted.

FIG. 6 is a sectional view of a workpiece positioning stopper for a lathe according to a second aspect of the present invention, which is equipped with an intermediate guide.

[Explanation of symbols]

 1 Spindle 2 Chuck 3, 4 Bearing 5 Workpiece 6, 6'Mounting Holder 6a Hole 7, 7'Stopper Holder 8, 8'Work Stopper 9 Spacer 10, 11, 12 Set Screw 13 Fixing Groove 14 Mounting Portion 15 Recess 16 Hole 17, 18 Collar part 21, 23, 24, 27 Male screw part 20, 22 Female screw part 19 Mounting female screw part 25 Guide pipe 26 Intermediate guide 29 Guide hole 30 Lock nut

Claims (4)

[Claims] 1. A mounting holder 6 having a mounting portion detachable from a rear end portion of a main shaft of a lathe and a hole 6a penetrating therethrough, and a work stopper 8 is detachably provided at one end portion thereof and is slidable in the hole 6a of the mounting holder. A stopper holder 7 which is movably fitted, a hollow cylindrical spacer 9 which is fitted in an intermediate portion of the stopper holder 7, a fixing groove 13 which is provided in the axial direction of the stopper holder 7, and a mounting holder 9 A work piece positioning stopper for a lathe, comprising: a set screw 10 whose front end is tightened at the bottom of the fixing groove 13; 2. A mounting holder 6'having a mounting portion which is attachable to and detachable from a rear end portion of a main shaft of a lathe and a female screw portion 20 penetrating therethrough, and one end of which is screwed to the female screw portion 20 of the mounting holder 6 '. A male screw portion 21 is provided and a female screw portion 22 is provided at least on the other end.
Of the hollow cylindrical stopper holder 7 ′ having a through hole provided with, a work stopper 8 ′ having a male screw portion 24 screwed to the female screw portion 22 of the stopper holder 7 ′, and a work stopper 8 ′. A lock nut 30 screwed to the male screw portion 24 for fixing the screwing position of the work stopper 8'to the stopper holder 7 ', and means for fixing the screwing position of the stopper holder 7'to the mounting holder 6'. A workpiece positioning stopper for a lathe, which comprises a work stopper 8 ′ and a stopper holder 7 ′ which can be selectively combined with each other. 3. A guide tube 25 arranged in the main shaft of a lathe is screwed to the front end side of the female screw portion 20 of the mounting holder 6 ', and a stopper holder 7'is screwed to the rear end side thereof. The workpiece positioning stopper for a lathe according to claim 2. 4. An intermediate guide 2 having a guide hole 29 penetrating to the center inside the female screw portion 20 of the mounting holder 6 '.
The workpiece positioning stopper for a lathe according to claim 3, wherein 6 is provided.