JP2524484Y2 - Tailstock device - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a tailstock device in a precision lathe.

[Conventional technology]

Conventionally, in turning with a lathe, a center or a chuck is attached to the rotating spindle of the lathe, and one end of the workpiece is held on the center or the chuck, and the other end is pressed and supported by the center of the tailstock, The workpiece is turned with the spindle and the workpiece is turned with a cutting tool. As a tailstock device in a lathe generally used, a center hole provided in an end face of a work is supported by a center incorporated in the tailstock, and a work is supported between a work holding means provided at an end of a lathe spindle. doing. Also, when supporting a workpiece, the tailstock is moved to an optimum position on the lathe bed corresponding to the length of the workpiece, and the tailstock is fixed on the lathe bed at this position. ing.

In general, for a tailstock device, the guide surface that guides the tailstock when the tailstock moves on the lathe bed must be abrasion-resistant and easy to work on the guide surface. Furthermore, the influence of the rotational moment generated from the difference in the line of action of the resistance and the force that moves the sliding motion during the movement of the tailstock is reduced as much as possible, and the gap between the sliding surfaces becomes more than necessary. It must be processed so that it does not become large, and finally be configured so that the tailstock can be adjusted with respect to the lathe bed.

[Problems to be solved by the invention]

In recent years, components used in computer-related devices, OA devices, VTRs, and the like have been required to be small and highly accurate. According to the development of cutting tools used in lathes and the like, turning tools are provided that can be turned even for hardened steel, which has been considered difficult to turn in the past, and the final finishing process is performed only on the cutting tool on the workpiece, That is, grinderless processing has become possible.

On the other hand, in a lathe that provides such grinderless processing, a tailstock device, which is an important mechanism constituting the lathe, has high rigidity and high accuracy. What used to be a table device must pay close attention to accuracy as with the spindle device.

However, in order to perform grinderless processing on a workpiece using a conventional tailstock apparatus, even if it is possible to use general machine parts, when processing OA parts, automobile parts, etc. The final processing of the part must ensure processing accuracy on the order of microns, and it has been quite difficult to obtain such high-precision processing on a workpiece using a conventional tailstock apparatus. .

In addition, as described above, since the tailstock in the tailstock device is used by being moved to an arbitrary position on the bed, regardless of the position of the tailstock, the tailstock is always used under the same conditions. Must be able to ensure the same accuracy. Further, it is not preferable in terms of mechanical rigidity to use a shaft incorporated in the frame of the tailstock device for supporting a workpiece more than necessary and protruding from the frame.

There is a limit to aligning the tailstock rotation center axis with the lathe spindle rotation center axis using the adjustment screw provided on the side of the conventional tailstock device, and it is difficult to fine-tune the tailstock frame with respect to the lathe bed. there were. Further, it is difficult for the guide key provided on the lower surface of the frame to require an accurate right angle with respect to the rotation center axis, and the tip of the center used for the tailstock device is slightly swung, The thrust acting on the workpiece supported by the center also works from a slightly deviated direction. As a result, when turning thin workpieces,
The required processing accuracy could not be secured.

The purpose of this invention is to solve the above-mentioned problem, and to move the tailstock from the end of the lathe spindle to an arbitrary position on the bed corresponding to the length of the workpiece, and place the tailstock on the bed. In the tailstock device fixed to the tailstock, two taper gibs are provided between the tailstock frame and the bed, and when the tailstock is moved relative to the turning bed by the moving screw, the taper gib provides a precise guide for the frame. Another object of the present invention is to provide a tailstock apparatus provided with a fine adjustment mechanism for finely moving a frame relative to a bed in a width direction to align a tailstock rotation center axis with a lathe main shaft rotation center.

[Means for solving the problem]

This invention is configured as follows to achieve the above object. That is, the present invention provides a tailstock apparatus in which a tailstock is arranged on a lathe bed and the tailstock is fixed on the lathe bed at an arbitrary position from the end face of the lathe spindle. The upper surface of the tailstock frame is formed by protruding the upper surface of the tailstock so as to be inserted between the inner surfaces of the respective bed portions. Both side surfaces of the convex portion facing the side surface are formed in a tapered surface, and tapered gibs are slidably mounted on two space portions formed by the inner surface and the side end surfaces, respectively, through the respective tapered gibs. The tailstock device is characterized in that the projection of the frame is fixed to the inner surface of the bed in a pressure-contact state.

Further, in this tailstock device, the side end surface of the projection, the inner surface of the tapered gib and the bed portion,
It is configured symmetrically with respect to a vertical plane passing through the center of the lathe spindle.

Further, in this tailstock apparatus, the fine adjustment of the sliding of the taper gib with respect to the convex portion in the space portion is performed by screwing into a female screw formed on a side end surface portion of the convex portion facing the taper gib and performing the taper gib. This can be achieved by an adjusting screw that engages with the notch formed in the above.

[Action]

The tailstock device according to the present invention is configured as described above, and operates as follows. That is, in this tailstock apparatus, two opposing bed portions projecting from the upper surface of the lathe bed and projecting from the lower surface of the tailstock frame project taper gibs into two space portions formed between the respective convex portions. Since each of the protrusions is slidably mounted, the side surface of each of the projections is formed on a tapered surface, and the tapered gib is inserted into the space so as to be in pressure contact with the tapered surface of the tapered gib. The respective protrusions of the tailstock can be fixed to the lathe bed at a desired position with respect to the lathe bed.

In particular, this tailstock device can move the frame by a small distance in the width direction with respect to the lathe bed by changing the degree of insertion of the two tapered gibs, respectively. The tailstock rotation center axis can be easily matched, and the workpiece can be supported accurately.

〔Example〕

Hereinafter, an embodiment of the tailstock device according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a front view showing an embodiment of a tailstock device according to the present invention, FIG. 2 is a side view of FIG.
3 is a plan view of a part of the tailstock device of FIG. 1 and a partial cross section taken along line III-III of FIG. 4, FIG. 4 is a side view of FIG. 3, and FIG. 3A is a perspective view showing an example of a taper gib incorporated in the tailstock device of FIG. 3, FIG. 6A is a side view showing an example of an adjusting screw screwed into a frame, and FIG. 6B.
6A is a plan view of the adjustment screw of FIG. 6A, FIG. 7A is a side view showing an example of the adjustment screw screwed into the frame, and FIG. 7B is a view of FIG. 7A. It is a top view of an adjustment screw.

The tailstock device according to the present invention is arranged on the upper surface of the lathe bed 1 and is used by being fixed at an arbitrary position from the end surface of the lathe spindle (not shown), and is slidable on the bed 1. The frame 2 disposed, the shaft 19 inserted into the through hole 18 of the frame 2, the insertion hole 21 formed at the end of the shaft 19 on the lathe main spindle side, and the center removably attached to the insertion hole 21.
20 and a cylinder 22 attached to the frame 2 via a bracket 23 and for moving the shaft 19 in the through hole 18 in the axial direction.

The center 20 has a center body 25, a stem 24 fixed to the center body 25 and fitted into the insertion hole 21, and a center rotating body 14 rotatably supported in the center body 25. When attaching the center 20 to the shaft 19,
It can be attached by inserting the center 20 into the 19 insertion holes 21. When removing the center 20 from the shaft 19, the center 20 can be easily removed by rotating the removal nut 26 screwed into the center main body 25.

Further, in this tailstock apparatus, a projection 27 having a female screw 16 is provided at the lower end of the frame 2. On a support plate 28 attached across a pair of bed portions 1A, 1B protruding from the upper surface of the lathe bed 1, a rotary screw 15 screwed with a female screw 16 formed on a protruding portion 27 is rotatably mounted. ing. The rotational movement of the rotary screw 15 is achieved by rotating a manual handle 17 fixed to the rotary screw 15.
Therefore, when the rotation screw 15 is rotated by rotating the manual handle 17, the protrusion 27 formed with the female screw 16 screwed to the rotation screw 15 moves along the bed portions 1A and 1B.
The movement of the protruding portion 27 moves the frame 2 integrally formed with the protruding portion 27. Therefore, the tailstock is moved with respect to the lathe bed 1 along the center axis of the lathe spindle.

The tailstock device according to the present invention is particularly characterized by having the following configuration. That is, the tailstock device is mainly provided with a pair of bed portions 1A and 1B, each having the upper surface 12 of the lathe bed 1 protruding upward, and an inner surface 4 of the bed portions 1A and 1B. The lower surface of the frame 2 has a convex portion 3 protruding downward, and both end surfaces of the convex portion 3 opposed to the inner side surfaces 4 of the bed portions 1A and 1B are formed as tapered surfaces 7, and the inner side surface 4 and the convex portion 3 The tapered gibs 5 and 6 are respectively attached to the two space portions 8 constituted by the tapered surfaces 7 on both side end surfaces of the bed portions 1A and 1B via the tapered gibs 5 and 6 so that the convex portions 3 are formed on the inner surfaces 4 of the bed portions 1A and 1B. Lathe bed 1 by pressing both end faces of the
The tailstock is fixed to the base.

In this tailstock device, the bed portions 1A and 1B and the projection 3
The movement of the tapered gibs 5 and 6 with respect to
This can be achieved by adjusting screws 10 and 11 which are screwed into the female screw 9 formed in the above and are partially engaged with the notches 5A, 5B, 6A and 6B of the tapered gibs 5 and 6.

In this tailstock device, the lathe bed 1 has two bed parts 1A and 1B protruding in an opposed state, and each bed part 1A,
The inner surface 4 and the upper surface 12 of 1B are finished by a grinding machine, and the upper surface 12 of the bed portions 1A and 1B providing the surface on which the tailstock frame 2 is mounted is finished, and then the bed portions 1A and 1B are finished. Finish the inner surface 4 of 1B. In the step of finishing the surface of the bed 1, it is preferable to keep the bed 1 fixed to the grinding machine. That is, once the bed 1 is fixed to the grinding machine, the upper surface 12 of the bed portions 1A and 1B in the bed 1 is
By finishing the inner surface 4 and the inner surface 4, it is possible to simultaneously process both surfaces, and no error occurs due to the mounting operation. In the finishing of the inner surface 4 of the bed 1, in particular, the parallelism of the two opposing inner surfaces 4 must be accurately finished, but the spacing between the opposing inner surfaces 4 of the two bed portions 1A and 1B. Is not particularly limited.

In this tailstock apparatus, the protrusion 3 of the tailstock frame 2 is used.
Side end surface, ie, tapered surface 7, tapered gibbs 5, 6 and bed portion 1
The inner surfaces 4 of A and 1B are configured symmetrically with respect to a vertical plane passing through the center of the lathe spindle. The rear end of the frame 2, that is, the projection 3, which is the frame end opposite to the lathe spindle, has a female screw 9 in which a portion in the circumferential direction of the screw, that is, a portion where the corners of the tapered gibs 5 and 6 are located is cut. It is formed in the longitudinal direction and at the distribution position on the center line.

For example, a female screw 9 is formed on the convex portion 3 of the frame, and then the both end surfaces 7 of the convex portion 3 are tapered to form the female screw 9 partially cut away. Although the absolute value of the width of the convex portion 3 is not limited,
It is necessary to accurately process the verticality of the side end surface 7 formed on the projection 3. Also, the tapered surfaces of both end surfaces 7 of the convex portion 3 are
It is necessary to form them at the same angle α (see FIG. 5) as the tapered surfaces 5T, 6T of the tapered gibs 5, 6. Finally, it is preferable that the tapered surface 7 formed on the side end surface of the convex portion 3 and the tapered surfaces 5T, 6T formed on the tapered gibs 5, 6 be precisely machined by grinding.

Also, the tapered surfaces 5T and 6T of the tapered gibs 5 and 6
It is formed on the inner surface of 5,6. These taper give 5,6
Are inserted into gaps or spaces 8 formed between the side end surfaces 7 of the tailstock frame 2 that can reciprocate on the beds 1A and 1B and the inner surfaces 4 of the beds 1A and 1B, respectively. Part 8
To adjust the gap by sliding the taper gibs 5 and 6, thereby adjusting the tailstock frame 2 to the center of the lathe spindle by moving the tailstock frame 2 in the width direction with respect to the lathe bed 1. Is what you do.

Further, the taper gibs 5, 6 have two notches 5A, 5B, at the end opposite to the lathe spindle and at the position facing the female screw 9.
6A and 6B are formed. Adjusting screws 10 and 11 are screwed into the female screw 9 formed on the side end surface of the convex portion 3, and the adjusting screw 10 is provided with the notch 5 formed on the tapered gibs 5 and 6.
A, 6A is engaged, and the adjusting screw 11 is engaged with notches 5B, 6B formed in the tapered gibs 5, 6.

In this tailstock apparatus, 4
The bolt holes 13 are formed. These bolt holes 13
The bolts are screwed into the frame 2 and the bed 1
Are temporarily fixed to the bed portions 1A and 1B. Frame 2
Are temporarily fixed to the bed portions 1A and 1B of the bed 1 and taper gibs 5 and 6 formed slightly longer are formed between the side end surface 7 of the tailstock frame 2 and the inner side surfaces 4 of the bed portions 1A and 1B. Into the space 8 to be tapered, and perform a grinding operation while checking the contact of the tapered gibs 5 and 6. After the tapering gibs 5 and 6 are assembled, the tapering gibs 5 and 6 are cut to an optimum length. Next, the above-mentioned notches 5A, 5B, 6A, 6B with which the adjusting screws 10, 11 are engaged are formed at predetermined positions of the taper gibs 5, 6. Further, the center 20 is attached to the lathe spindle, and the center, which is the center rotating body 14, is attached to the frame 2, and a test bar is held between the centers to check the parallelism between the centers.

Further, this tailstock apparatus is provided with a bed portion 1 of a lathe bed 1.
A, 1B upper surface 12 and the bed portion 1 processed simultaneously with the upper surface 12
Since it is used in close contact with the inner side surface 4 of A and 1B, the same conditions can always be set regardless of the position of the bed portion 1A or 1B in accordance with the length of the workpiece.

In order to move the frame 2 of the tailstock apparatus, the manual screw 17 attached to the bed 1 is rotated to rotate the rotary screw 15 so that the female screw 16 provided on the projection 3 of the frame 2 is moved in the axial direction. To, therefore, frame 2
Moves in the axial direction with respect to the beds 1A and 1B. Rotating screw 1
Reference numeral 5 is arranged at the center position of the tailstock apparatus, and is provided in the vicinity of the tapered gibs 5, 6 which function as a guide. Therefore, the tailstock device is not affected by the rotational force acting on the tailstock device, which is generated by the movement of the frame 2 of the tailstock device.

In this tailstock apparatus, in order to make the rotation center axis of the lathe main spindle coincide with the rotation center axis of the center 20 attached to the tailstock frame 2, the side end face 7 of the convex portion 3 provided on the lower surface of the frame 2 and the bed In the space portion 8 formed by the inner side surface 4 of the portions 1A and 1B. By sliding the tapered gibs 5, 6 relatively in the axial direction, the tailstock frame 2 can be moved in the width direction to achieve this. In particular, the tapered surfaces 5 and 6
By moving both T and 6T in the axial direction along the tapered surface 7 of the convex portion 3 while pressing both the tapered surfaces, the frame 2 slightly moves in the width direction and the movement becomes extremely small, so that the center of rotation of the lathe spindle is rotated. Center 20 attached to shaft and tailstock frame 2
Can be easily matched with the rotation center axis of.

Also, as shown in FIGS. 6 (A), 6 (B), 7 (A) and 7 (B), a rotary tool formed on the adjusting screw 11 for rotating the adjusting screw 11. The hole 11H has a larger hole diameter than the rotary tool hole 10H formed in the adjusting screw 10 for rotating the adjusting screw 10. Therefore, when rotating the adjusting screw 10, the rotating tool for rotating the adjusting screw 10 should be engaged with the rotating tool hole 10H through the rotating tool hole 11H of the adjusting screw 11 from the end side of the projection 3. ,
The adjusting screw 10 can be rotated.

Therefore, the movement of the tapered gibs 5, 6 with respect to the convex portion 3 can be performed as follows. First, the adjustment screw 11 is sufficiently loosened in the locked state. By rotating the adjusting screw 10, the taper gibs 5, 6 are slid in the axial direction with respect to the projection 3. After setting the tapered gibs 5 and 6 at predetermined positions with respect to the convex portion 3,
The adjusting screw 11 is rotated to tighten it, and the tapered gibs 5 and 6 are locked with respect to the convex portion 3.

In this tailstock device, after the convex portion 3 is set at a predetermined position with respect to the bed portions 1A and 1B via the tapered gibs 5 and 6, the clamp screw 30 is inserted from the upper surface of the frame 2,
By fastening the clamp screw 30 to the attachment plate 29 disposed on the lower surface of the bed portions 1A and 1B, the tailstock frame 2 can be set and fixed to the bed portions 1A and 1B.

This tailstock device is one of the processes that general machine tools have.
Unlike the slide mechanism which repeats the movement every cycle, the wear of the sliding parts such as the side end face 7 of the convex part 3 of the frame 2, the tapered gibs 5, 6 and the inner surface 4 of the bed parts 1A, 1B is not so large, In some cases, play may occur due to wear or the like accompanying the sliding movement. Even when rattling occurs in the sliding portion, it can be easily corrected by moving the taper gibs 5 and 6.

Similarly, when the tapered gibs 5, 6 themselves are replaced, the position of the frame 2 with respect to the bed 1 can be easily adjusted. For example, if the taper gib 5 is pulled out to the side opposite to the lathe spindle and the taper gib 6 is pushed toward the lathe spindle, the frame 2 moves in the width direction toward the bed 1B side of the bed 1. Conversely, if the taper gib 5 is pushed toward the lathe spindle and the taper gib 6 is pulled out on the side opposite to the lathe spindle, the frame 2 moves in the width direction to the bed 1A side of the bed 1.

The embodiment of the tailstock device according to the present invention is configured as described above, but is not limited to the above embodiment. That is, in the above-described embodiment, the tapered gibs 5, 6 are inserted from behind the tailstock frame 2 to operate, but the present invention is not limited to this configuration. For example, it is possible to insert the taper gibs 5 and 6 from the front of the tailstock frame 2, that is, from the lathe main shaft side, so as to act. Alternatively, it is also possible to adopt a configuration in which one taper gib is inserted from the rear of the tailstock frame 2 to act, and the other taper gib is inserted from the front of the frame 2 to act. Alternatively, the protrusions provided on the frame are respectively provided on both sides in the width direction of the frame, the bed is positioned between the protrusions, and the space formed on both outer surfaces of the bed and both inner surfaces of the protrusions of the frame. It is also possible to adopt a configuration in which the taper gibs are inserted and arranged in the respective sections.

[Effect of the invention]

The tailstock device according to the present invention is configured as described above, and has the following effects. That is, this tailstock device constitutes opposed bed portions in which the upper surface of the lathe bed is projected, and also forms protrusions by projecting the lower surface of the frame of the tailstock, thereby forming side surfaces of the bed portion. And a space between the side surface of the convex portion and the side surface of the convex portion is formed in a tapered surface, and two tapered gibs having a tapered surface pressed against the tapered surface can slide in the space portion. Respectively, so that the convex portion of the tailstock can be fixed to the lathe bed by inserting the tapered gib into the space in a pressure-contact state. In particular, by changing the degree of insertion of the taper gib, the frame can be moved a small distance in the width direction with respect to the lathe bed, and therefore, the tailstock rotation center axis can easily coincide with the lathe main shaft rotation center. The workpiece can be accurately supported, the workpiece can be turned with high accuracy, and the machining accuracy of the workpiece can be extremely increased.

In addition, even if abrasion occurs due to sliding of the side end surface of the convex portion, the tapered gib and the inner surface of the bed portion, the tapered gib can be easily replaced, and the slack generated in the sliding portion can be adjusted by adjusting the tapered gib. The tailstock can be easily set for the lathe bed by absorbing easily.

Further, the space portion can be formed between the protrusion of the frame and the bed portion and inside or outside the bed portion, and when the space portion is formed inside the bed portion, Constitutes opposed bed portions by projecting the upper surface of the lathe bed, and projecting the lower surface of the frame of the tailstock so as to be inserted between the inner surfaces of the respective bed portions to form convex portions. This is achieved by forming both side end surfaces of the convex portion facing the inner side surface into a tapered surface, and slidably mounting a tapered gib in each of two space portions formed by the inner side surface and the side end surface. You.

Further, since the side end surface of the convex portion, the tapered gib, and the inner surface of the bed portion are configured symmetrically with respect to a vertical plane passing through the center of the lathe spindle, the adjustment of the tapered gib is extremely adjusted. High accuracy can be achieved.

Furthermore, since an adjusting screw which is screwed into a female screw formed on a side end surface portion of the convex portion facing the tapered gib and engages with a notch formed in the tapered gib is incorporated, it is only necessary to rotate the adjusting screw. The taper gib can be moved by a small distance in the axial direction with respect to the projection. Further, by providing two adjustment screws, one of the adjustment screws can be rotated to move the taper gib, and the other adjustment screw can fix the taper gib to the convex portion.

[Brief description of the drawings]

1 is a front view showing an embodiment of the tailstock device according to the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 shows a part of the tailstock device of FIG. FIG. 4 is a partial cross-sectional plan view taken along line III-III of FIG. 4, FIG. 4 is a side view of FIG. 3, FIG. 5 is a perspective view showing an example of a taper gib incorporated in the tailstock device of FIG. 6 (A) is a side view showing an example of an adjusting screw screwed into the frame, FIG. 6 (B) is a plan view of the adjusting screw of FIG. 6 (A), and FIG. 7 (A) is a screw on the frame. FIG. 7B is a side view showing an example of the adjusting screw to be inserted, and FIG. 7B is a plan view of the adjusting screw in FIG. 7A. 1 ... bed, 1A, 1B ... bed section, 2 ... frame,
3 ... convex part, 4 ... inner side surface, 5, 6 ... taper gib, 5A, 5
B, 6A, 6B ... Notch, 5T, 6T, 7 ... Tapered surface, 8 ... Space, 9, 16 ... Female screw, 10, 11 ... Adjustment screw, 12 ... Top surface, 13 ... Bolt hole, 14 ... Center rotating body, 15 ... Movement screw.

Claims (3)

(57) [Scope of request for utility model registration] 1. A tailstock apparatus used by fixing a tailstock on a lathe bed and fixing the tailstock on the lathe bed at an arbitrary position from an end face of a lathe spindle. The upper surface is protruded to form opposed bed portions, and the lower surface of the tailstock frame is protruded so as to be inserted between the inner surfaces of the respective bed portions to form convex portions, respectively. The opposite side of the convex portion is formed with a tapered surface on both sides, and a tapered gib is slidably mounted on each of two spaces formed by the inner surface and the side end surface, and the tapered gib is inserted through each of the tapered gibs. A tailstock device, wherein the projection of the frame is fixed to the inner surface of the bed in a pressure-contact state. 2. The tailstock according to claim 1, wherein said side end surface of said convex portion, said tapered gib, and said inner surface of said bed portion are symmetrical with respect to a vertical plane passing through the center of said lathe spindle. Table equipment. 3. The fine adjustment of sliding of the taper gib with respect to the convex portion in the space portion is performed by screwing into a female screw formed on a side end surface portion of the convex portion facing the taper gib and forming a cut formed on the taper gib. 2. The tailstock device according to claim 1, which can be achieved by an adjusting screw engaging the notch.