JP2001170803A - Tail stock of machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tail stock of a machine tool capable of easily and certainly arranging a center against a main spindle coaxially. SOLUTION: This tail stock 10 constituted of a base 12 to be moved along a guide 94 of a bed 91 and a main body 14 to install a center 24 is furnished with a core height adjusting means arranging an eccentric ram shaft 22 forming a center loading hole 22A at an eccentric position on a housing 20 of the main body 14 free to rotate and a longitudinal adjusting means to energize the main body 14 horizontally and in the orthogonal direction against a shaft center of the center by interposing an elastic body 16 between the main body 14 and the base and making an adjusting bolt contact with the other of the base and the main body by screwing the adjusting bolt 18 in one of the base and the main body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tailstock applicable to a machine tool such as a lathe, a cylindrical grinder, a screw grinder and the like. The present invention relates to a tailstock of a machine tool that can be arranged.

[0002]

2. Description of the Related Art A lathe 90 shown in FIG.
A headstock 92 provided at one end of the bed 91 and incorporating driving means such as a motor, a tailstock 93 installed at the other end of the bed 91, and a guide 94 on the upper surface of the bed 91. It is constituted by a carriage 95 to be moved. The headstock 92 holds a spindle 96 having a conical tip, and the tailstock 93 also holds a center 97 having a conical tip. The center of the spindle 96 of the headstock 92 and the tailstock 93
97 supports the ends of the cylindrical workpiece 98, and one end of the workpiece 98 is engaged with a flange united with the spindle 96 by a turning metal or the like. The object 98 is rotated. On the other hand, a tool, a grindstone and the like are supported on the carriage 95, and the carriage 95 is moved along the guide 94 to cut or grind the surface of the workpiece 98.

In such a lathe 90, in order to perform high-precision machining on the outer peripheral surface of the workpiece 98, the spindle
It is essential to arrange the center 97 with high accuracy on the same axis as the center 96. For this reason, in the lathe 90, before use, the center height adjusting means for adjusting the position of the center 97 in the center height direction (see arrow X in the figure), and the front and rear adjustment for adjusting the position in the front and rear direction (see arrow Y in the figure). Means are provided.

As a specific center height adjusting means, a tailstock 93 is formed while maintaining the center 97 parallel to the guide 94, and the lower surface of a base 93A slidingly contacting the guide 94 and the center
A method of polishing and adjusting a liner or the like supporting the 97 is often used. On the other hand, as the front-rear adjustment means, a slide rail extending in the front-rear direction is provided between the base 93A and the main body 93B constituting the tailstock 93, and the main body is moved along the slide rail.
A sliding adjustment method of moving the 93B and fixing the main body 93B at a predetermined position by a clamp or the like is often used.

[0005]

By the way, such a lathe 90 may support other workpieces having different axial dimensions. Therefore, when the tailstock 93 is moved along the guide 94, Due to the mounting accuracy and surface accuracy of guide 94, the spindle
There is a possibility that the center of the center 97 is shifted from the center 96. In this case, the center height adjustment and the front-back adjustment as described above need to be performed again.

[0006] In particular, the slide-type adjustment method frequently used as the front-rear adjustment method described above is based on the structural reason that the positions of the base 93A and the main body 93B connected via slide rails are fixed by clamps. Due to the gap between the main bodies 93B, an error in the center height direction tends to occur in the position of the main body 93B during the clamping operation. Therefore, the position adjustment work becomes complicated, which hinders the lathe 90 from improving the work efficiency of multi-type cutting or grinding.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to facilitate the centering of the spindle with respect to the spindle.
Another object of the present invention is to provide a tailstock of a machine tool that can be coaxially arranged with certainty.

[0008]

In order to achieve the above-mentioned object, a tailstock according to the present invention comprises a base which is moved along a guide of a bed, and a tailstock constituted by a main body on which a center is mounted. A base, a center height adjusting means rotatably disposed in a housing of the main body with an eccentric ram shaft having a center loading hole formed at an eccentric position, and an elastic body interposed between the main body and the base. While urging the main body horizontally and in a direction perpendicular to the axis of the center, an adjusting bolt is screwed into one of the base and the main body,
And a front-rear adjustment means in which the adjustment bolt is brought into contact with the other of the base and the main body.

According to the tailstock of the machine tool constructed as described above, as the center height adjusting means, the center is adjusted along the center height direction by rotating the eccentric sleeve with respect to the housing of the main body. You can do it. In other words, in such a center height adjusting means, by performing an extremely simple operation of rotating the eccentric sleeve, the center can be displaced to an arbitrary position in the center height direction in a stepless manner. In addition, the center height of the center can be reliably adjusted.

Further, according to the tailstock of the machine tool, the main body can be adjusted steplessly in the front-rear direction and at an arbitrary position by screwing the adjustment bolt as the front-rear adjustment means. Become. At this time, since the adjusting bolt moves the main body relative to the base against the urging force of the elastic body, the tip end of the adjusting bolt abuts on the main body due to the elastic force of the elastic body trying to restore the initial shape. The condition is always maintained, so that there is no possibility that a gap is generated between the tip of the adjustment bolt and the main body. In other words, in such a front-rear adjustment means, the center can be steplessly arranged at any position in the front-rear direction by performing a very simple operation of rotating the adjustment bolt about the shaft, and it is easier than before, and The center can be reliably adjusted back and forth.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a tailstock of a machine tool according to the present invention will be described below in detail with reference to the drawings.
The other parts of the machine tool are the same as before,
No particular description is given here. FIG. 1 conceptually shows a basic configuration of a tailstock of a machine tool according to the present invention. A tailstock 10 is composed of a base 12 and a main body 14.
The main body 14 has one side surface 14A supported by the base 12 by the elastic plate 16. On the other hand, an adjustment bolt 18 is screwed into the base 12, and the tip of the bolt 18 is in contact with the other side surface 14B of the main body 14 opposite to the side surface 14A. Therefore, the main body 14 is constantly pressed against the tip of the adjusting bolt 18 by the urging force of the elastic plate 16, and is displaced in the front-rear direction by screwing the adjusting bolt 18.

The main body 14 has its housing 20 rotatably holding the eccentric ram shaft 22, and the center 24 is fitted into the center mounting hole 22 A of the eccentric ram shaft 22. Therefore, the center 24 is displaced in the center height direction by rotating the eccentric ram shaft 22. The tailstock 10 is fixed on the bed 91, similarly to the conventional machine tool described above.

The tailstock 10 will be described in detail below with reference to FIGS. FIG. 2 is a side view of the tailstock, FIG.
Is a plan view of the tailstock, FIG. 4 is a rear view of the tailstock, and FIG.
FIG. 6 is a horizontal sectional view taken along line AA in FIG.
FIG. 7 is a partial vertical cross-sectional view taken along line A-B of FIG. 2.

In the body 14 of the tailstock 10, as shown in FIG. 5, a ram shaft accommodating hole 20A is formed through the housing 20, and a high-precision bush, for example, a clearance-adjustable linear ball bearing 26 is formed in the hole 20A. The ram shaft 22 is inserted through the.
The ram shaft 22 has a shaft center at a position deviated from the shaft center, and has a center mounting hole 22A opened at one end of the ram shaft 22. The hole 22A has a tapered shape.
The center 24 is fitted.

The eccentric ram shaft 22 has a female screw hole 22E communicating with the center mounting hole 22A. The eccentric ram shaft 22 further communicates with the female screw hole 22E and opens at the other end of the ram shaft 22. A hole 22B is formed in the shaft core, and a large-diameter spring accommodating hole 22C is formed at the open end of the hole 22B.
A flange is formed at the other end of the ram shaft 22, and two slots 22D are formed on the left side in the radial direction.

An eccentricity adjustment bracket 28 is fitted on the outer periphery of the other end of the ram shaft 22 thus formed so as to be slidable in the axial direction. The bracket 28 is screwed to one end of the bracket. The tip of the engaging pin 30 is inserted into the slot 22 </ b> D of the ram shaft 22 and engaged with the ram shaft 22. At the other end of the bracket 28, a stroke plate 32 is provided. As shown in FIG. 4, the stroke plate 32 has an arc-shaped hole 32.
And is fastened to the bracket 28 by a bracket fixing screw 34 inserted through the arc-shaped hole 32A.

In the stroke plate 32, a female screw hole 32B is formed coaxially with a hole 22B for a centering screw shaft formed in the ram shaft 22. A spring adjusting sleeve 36 is screwed into the female screw hole 32B.
C coil spring inserted into the spring accommodation hole 22C
38 is restrained in the hole 22C. This spring adjustment sleeve 36
A lock nut 40 is screwed into the nut, and the adjustment sleeve 36 is locked to the stroke plate 32 by bringing the nut 40 into contact with the stroke plate 32.

Further, on the inner peripheral surface of the spring adjusting sleeve 36,
An insertion hole 36A through which the centering screw shaft 42 can be inserted is formed. The centering screw shaft 42 is inserted into the hole 22B for the centering screw shaft of the adjusting sleeve 36 and the ram shaft 22. A male screw 42A is formed on the outer peripheral surface of the tip of the shaft 42, and the male screw 42A is screwed into the female screw hole 22E on the inner peripheral surface of the ram shaft 22.

The housing 20 has a guide shaft hole 20B formed in parallel with the ram shaft 22. The guide shaft 46 is slidably inserted into the guide shaft hole 20B via a high-precision bush, for example, a linear ball bearing 44. On the other hand, the stroke plate 32 has a guide shaft hole.
A hole 32C is formed coaxially with 20B, and the tip of a shaft fixing bolt 52 inserted through the hole 32C through the spherical seats 48 and 50 is screwed into the end of the guide shaft 46, so that the guide shaft 46 is stroked. Board
32 is engaged.

Also, as shown in FIG.
A hole 32D is formed in the hole 32, and an actuator such as a cylinder rod 54A of an air cylinder 54 is connected to the hole 32D through the fixed bracket 53 and the movable bracket 53A (see FIG. 3). Through jig 56,
They are connected by a cylinder fixing screw 58.

In the tailstock 10 constituting the main body 14 as described above, the bracket fixing screw 34 is loosened, and the screw 34 is moved along the arc-shaped hole 32A of the stroke plate 32. Then
The eccentric ram shaft 22 is rotated via the eccentricity adjusting bracket. Therefore, the tip of the center 24 also moves while drawing a locus of an eccentric circle, and is thereby displaced in the center height direction.
In order to support the workpiece 98 between the main shaft 96 and the center 24, the air cylinder 54 is operated when the center 24 is moved in the axial direction. Then, the cylinder rod 54A
The stroke plate 32 is moved in the axial direction of the center 24 via the
To move the center 24 in the axial direction,
The guide shaft 46 is guided and moved by the linear ball bearing 44.

When removing the center 24 from the ram shaft 22, the center removing screw shaft 42 is rotated. Then
The shaft 42 hits the center 24 and projects the center 24 from the ram shaft receiving hole 20A of the ram shaft 22. By loosening the clamper 53B, the movable bracket 53A can be slid in the axial direction with respect to the fixed bracket 53. As a result, within the slidable range, the axial position of the ram shaft 22 can be easily changed without moving the base 12, so that a set in the case of changing to a workpiece having a different length is set. Can be easily changed.

Further, in tailstock 10, one side surface 14 of main body 14 is provided.
The elastic plate 16 as shown in FIG. 7 is fixed to the side surface 12A of the base A and the base 12 by elastic plate fixing bolts 62 and 64, each of which is disposed in the vertical and axial directions. The elastic plate 16 is formed of a highly rigid material such as a steel plate, and has a groove 16A at an intermediate portion. The elastic plate 16 is formed to have substantially the same width as the width of the main body 14 in the axial direction. On the other hand, the base 12 has a side wall 12B facing the other side surface 14B of the main body 14, and an adjusting bolt 18 is screwed to the side wall 12B. The tip of the bolt 18 is in contact with the other side surface 14B of the main body 14 against the urging force of the elastic plate 16.

In the tailstock 10 configured as described above, the main body
The spring 14 is constantly pressed against the tip of the adjustment bolt 18 by the biasing force of the elastic plate 16 and is fixed. Then, the adjustment plate 18 is screwed to bend the elastic plate 16 to displace the main body 14 in the front-rear direction.

The tailstock of the machine tool according to the present invention is not limited to the above-described embodiment, but may be modified appropriately.
Improvements are possible. For example, in the above embodiment, the ram shaft 22 is
The ram shaft 22 may be rotatably mounted on the stroke plate 32 in the axial direction thereof, while being rotatably mounted on the stroke plate 32 via the. In the above embodiment, the elastic plate 16 is employed as the means for adjusting the center 24 in the front-rear direction. However, a coil spring, a disc spring, or the like is interposed between the base 12 and the main body 14 so that the main body 14 can be moved. May be energized. In the above embodiment, the adjustment bolt 18 is screwed into the base 12 and the tip of the bolt 18 is in contact with the main body 14. The tip of the bolt 18 may be screwed into the main body 14.

[0026]

As described above, in the tailstock of the machine tool according to the present invention, the tailstock constituted by the base moved along the guide of the bed and the main body on which the center is mounted is provided. An eccentric ram shaft having a center loading hole formed at an eccentric position, a center height adjusting means rotatably disposed in a housing of the main body, and an elastic body interposed between the main body and the base; A horizontal and at right angles to the axis of the center, and an adjustment bolt is screwed into one of the base and the main body, and the adjustment bolt is mounted on the other of the base and the main body. And front and rear adjustment means brought into contact therewith.

Therefore, according to the tailstock of the present invention,
By rotating the eccentric sleeve with respect to the housing of the main body, the center can be adjusted along the center height direction. By performing the extremely simple operation of rotating the eccentric sleeve axially, the center can be adjusted in the center height direction. It can be displaced to an arbitrary position in a stepless manner, and the center height of the center can be adjusted more easily and reliably than in the past. Further, according to the tailstock of the present invention, by screwing the adjustment bolt, the main body can be steplessly adjusted in the front-rear direction and at an arbitrary position, and the adjustment bolt can be axially rotated. By performing the operation, the center can be arranged steplessly at an arbitrary position in the front-rear direction, and the front-rear adjustment of the center can be performed more easily and reliably than in the past.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a basic configuration of a tailstock of a machine tool according to the present invention.

FIG. 2 is a side view of a tailstock of the machine tool according to the present invention.

FIG. 3 is a plan view of a tailstock of the machine tool according to the present invention.

FIG. 4 is a rear view of the tailstock of the machine tool according to the present invention.

FIG. 5 is a horizontal sectional view taken along line AA in FIG. 2;

FIG. 6 is a partial longitudinal sectional view taken along line AA in FIG. 2;

FIG. 7 is a vertical sectional view taken along line BB in FIG. 2;

FIG. 8 is a perspective view showing a lathe as a conventional machine tool.

[Explanation of symbols]

 10 Tailstock 12 Base 12B Side wall 14 Body 14A One side 14B Other side 16 Elastic plate 16A Groove 18 Adjustment bolt 20 Housing 20A Ram shaft receiving hole 20B Guide shaft hole 22 Eccentric ram shaft 22A Center mounting hole 22B For centering screw shaft Hole 22C Spring accommodation hole 22D Slot 22E Female screw hole 24 Center 26 Clearance adjustable linear ball bearing 28 Eccentricity adjustment bracket 30 Engagement pin 32 Stroke plate 32A Arc hole 32B Female screw hole 32C, 32D hole 34 Bracket fixing screw 36 Spring adjustment Sleeve 36A Insertion hole 38 Coil spring 40 Lock nut 42 Center release screw shaft 42A Male screw 44 Linear ball bearing 46 Guide shaft 48, 50 Spherical seat 52 Shaft fixing bolt 53 Fixing bracket 53A Movable bracket 53B Clamp 54 Air cylinder 54A Cylinder rod 56 Fixture 58 Cylinder fixing screw 60, 62 Elastic plate fixing bolt 91 Bed 94 guide

Claims (1)

[Claims] 1. A tailstock comprising a base which is moved along a guide of a bed and a main body on which a center is mounted, wherein an eccentric ram shaft having a center loading hole formed at an eccentric position is attached to the main body. A core height adjusting means rotatably disposed on the housing;
An elastic body is interposed between the main body and the base to urge the main body horizontally and in a direction perpendicular to the axis of the center, and an adjusting bolt is screwed into one of the base and the main body. A tailstock for a machine tool, comprising: front and rear adjustment means for bringing the adjustment bolt into contact with the other of the base and the main body.