JPH0413501A - Center height adjusting mechanism in machine tool - Google Patents

Abstract

PURPOSE:To faciliate adjustment of a center height by forming a main spindle table on a mounting surface to be movable along a first direction perpendicular to a main spindle, and holding the center of a tool shaft in the crossing direction to the first direction by a carriage movable parallel to the main spindle on the mounting surface. CONSTITUTION:A shaft center CT3 of a main spindle 21 moves in the direction of an arrow G by rotation of an eccentric pin 29 while reducing a center height H2, till the rotation action is stopped when it reaches a reference position as an intersection with a shaft center CT6 of a tool 17 installed at a tool rest 6 in the direction of arrows A, B, and a bolt 20 is tightened to fix a main spindle table 19 to a bed 3. The main spindle table 19 is fixed to the bed 3 with the center height H2 of the shaft center CT3 of the main spindle 21 corresponding to a center height H1 on the side of the tool rest 6, where adjustment of the center height is completed. While it moves for a distance L, the shaft center CT3 moves only for L.sinB in the Y-axis direction perpendicular to a slide surface 5b of a carriage 5 to the tool rest, thereby a fine adjustment is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a center height adjustment mechanism in a machine tool suitable for application to a machine tool such as a lathe.

(b), Prior Art FIG. 7 is a front view showing an example of a headstock and a tool rest constituting a conventional lathe.

Conventionally, when shipping the lathe 31 manufactured in a factory, the seventh
As shown in the figure, the center height H4 of the axis CT3 of the spindle 21 mounted on the headstock 19 on the bed 3 from the mounting surface 3a of the bed 3, and the axis CT6 of the tool mounted on the tool rest 6. Since it is necessary to perform so-called center height adjustment to match the center height H3 from the mounting surface 3a of the bed 3 in the Y-axis direction, there is a center height adjustment between the tool rest 6 and the carriage 5 on the tool rest 6 side. A spacer 30 is provided to adjust the height H3,
The center height of the lathe 31 was adjusted by grinding the spacer 30 and adjusting its thickness T1.

(C) 0 Problems to be Solved by the Invention However, this center height adjustment work is difficult because the heavy tool rest 6 is actually moved between the spacers 3 and 3.
0, and after measuring the difference ΔH between the center heights H3 and H4 on both sides, remove the turret 6 and place the spacer 30 on the measured center height difference ΔH.
After polishing based on the above, the turret 6 is mounted on the carriage 5 again via the polished spacer 3o, which is a cumbersome procedure, which necessitates inefficient and time-consuming center height adjustment work. was.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide a center height adjustment mechanism for a machine tool such as a lathe, which can easily adjust the center height of a machine tool.

(d) Means for solving the zero problem, that is, the present invention has a support (3) on which a mounting surface (3a) is formed in a first direction (arrow G, H direction), A main shaft having a main shaft (21) rotatably provided on the mounting surface (3a) of the body (3) about a main shaft axis (CTa) orthogonal to the first direction (directions of arrows G and H). stand (
19) is provided so as to be movable in the first direction (directions of arrows G and H), and the carriage (5) is mounted on the mounting surface (3a) of the support body (3) so that the carriage (5) is aligned with the main shaft axis (CTa). provided so as to be freely movable and driven in a second direction (direction of arrows E and F) parallel to the
The carriage (5) is provided with a tool axis center (direction of the tool axis) in a third direction (direction of arrows A, B) perpendicular to the main axis axis (CTa) and intersecting the first direction (direction of arrows G, H). Cr2
) is provided with a movable tool holding means (6).

Note that the numbers in parentheses are for convenience to indicate corresponding elements in the drawings, and therefore, this description is not limited to the description on the drawings. r (e) below
The same applies to the column ``, action''.

(e) 0 effect With the above configuration, the present invention allows the headstock (19) to be aligned with the tool axis center (Cr2) when adjusting the center height of the machine tool (1).
It acts to move in a first direction (direction of arrows G and H) that intersects with .

(f), Example An embodiment of the present invention will be described below based on the drawings.

FIG. 1 is a front sectional view showing the main parts of a multi-tasking lathe to which an embodiment of the center height adjustment mechanism for a machine tool according to the present invention is applied, and FIG. FIG. 1 is a transparent perspective view showing an example of a composite machining lathe to which the embodiment is applied.

FIG. 3 is a rear view of the bed and headstock that constitute the combined machining lathe shown in FIG. 1.

FIG. 4 is a front view of the vicinity of the eccentric pin portion of the compound machining lathe shown in FIG. 3.

FIG. 5 is a view taken in the direction of the ■ arrow in FIG. 4, and FIG. 6 is a diagram showing the meticulous movement locus of the main spindle constituting the compound machining lathe shown in FIG. 1.

A compound machining lathe 1, which is a machine tool, has a frame 2, as shown in FIG. 2, and a bed 3 having a substantially trapezoidal cross section is provided within the frame 2, as shown in FIG. There is. The upper part of the bed 3 has a predetermined angle α with respect to the horizontal plane HP.
A mounting surface 3a that is inclined by 1 is formed in the directions of arrows G and H in FIG. Arrows E and F in FIG. 2 parallel to the axis CT3 of the main shaft 21, which will be described later.
It is supported so that it can be slid and parked in any direction. That is, as shown in FIG. 1, a nut 5a is formed at the lower part of the carriage 5, and a ball screw 7 having an axis CTI in the Z-axis direction perpendicular to the plane of FIG. 1 is formed on the bed 3. The axis C
It is supported so that it can freely rotate and pulsate in the directions of arrows □ and J in Figure 1 with TI as the center. Furthermore, nut 5 of carriage 5
a is screwed into the ball screw 7, and a drive motor (not shown) is rotated in forward and reverse directions to move the ball screw 7 to the axis CT1.
By rotating in the direction of the arrow 11, J .

By the way, the carriage 5, as shown in FIG.
It has a casing 5C, and inside the casing 5c,
Axial center C in the direction of arrows A and B, which is the X-axis direction perpendicular to the Z-axis
A ball screw 9 having a diameter T2 is rotatably supported in the direction of arrow J through bearings 10 and 10. A belt pulley 11 is fitted to the upper end of the ball screw 9 in FIG. Further, a belt pulley 13 is fitted to the servo motor 12, and a timing belt 15 is stretched between the belt pulley 13 and the belt pulley 11 fitted to the ball screw 9. Therefore, by rotating the servo motor 12 in the forward and reverse directions, the belt pulley 13. The ball screw 9 is moved through the timing belt 15 and the belt pulley 11 with the axis CT2 as the center as shown by the arrow ■2 in FIG.
, J2 direction. Note that a resolver 16 is mounted on the upper side of the ball screw 9 in FIG. It is connected to a rotation control device (not shown) that controls the rotational operation of the motor 12 so as to output a feedback signal.

Therefore, the rotational movement of the ball screw 9 in the directions of arrows I, J2 in FIG.
The feedback circuit consisting of 6 etc. enables accurate execution according to the target value.

Further, on the casing 5c of the carriage 5, as shown in FIG.
It is formed to be inclined by a predetermined angle β (for example, X5@) with respect to a (therefore, the turret sliding surface 5b is inclined by an angle γ (=α+β) with respect to the horizontal plane HP. ), a tool rest 6 is supported on the tool rest sliding surface 5b so as to be slidable in the directions of arrows A and B, which are the X-axis directions.

That is, the nut 6a is located at the bottom of the tool rest 6 at the lower right in FIG.
That is, it is formed to protrude toward the carriage 5 side, and a ball screw 9 provided inside the casing 5c of the carriage 5 is screwed into the nut 6a. Therefore, by driving the servo motor 12 to rotate in the forward and reverse directions and driving the ball screw 9 to rotate in the directions of arrows 2 and J2 in FIG. 5 in the X-axis direction, that is, arrows A and B
It can be driven to move in the direction.

The tool rest 6 also includes a turret 1 as shown in FIG.
8 is mounted so as to be able to rotate 1801 in the directions of arrows U and ■ in the figure, centering on a rotation axis CT7 that forms an angle of 45 degrees with respect to the two axis directions (directions of arrows E and F) on the X-7 plane. The turret 18 is formed with two tool holding portions 18a and 18b whose tool holding directions are orthogonal to each other. Various tools 17 such as a cutting tool, a drill, etc. can be attached to each of the tool holding parts 18a and 18b, respectively.

On the other hand, a tool magazine 14 is installed behind the tool rest 6 in FIG. 2, and various tools 17 are loaded in the tool magazine 14. Further, a tool changer 24 is provided between the turret 18 mounted on the tool rest 6 and the tool magazine 14, and the tool changer 24 allows each tool holding section 18'a of the tool magazine 14 and the turret 18 to be , 18b
The tool 17 can be exchanged between the two. In addition,
Regarding this type of compound machining lathe machining, for example, 1.
227343, detailed description thereof will be omitted here.

Further, the headstock 19 is attached to the lower right part of the bed 3 in FIG. It faces the tool rest 6 and is fixed by the same number of bolts 20 through a plurality of bolt holes 19b shown in FIG. It has an elongated oval shape. In addition, the headstock 19 is arranged in the Z-axis direction perpendicular to the paper plane of FIGS. 1 and 3, that is, arrow G.
, a main shaft 21 having an axis CT3 in a direction perpendicular to the H direction.
is mounted rotatably in the directions of arrows M and N about the shaft center CT3, and workpieces 23 of various shapes such as bar work, shaft work, chuck work, etc. are mounted on the main shaft 21 via a chuck 22. 8 things are coming. In addition, as shown in FIG. 3, there is a space between the headstock 19 and the bed 3.
The eccentric pin 29 is rotatably fitted and engaged, and the eccentric pin 29 is connected to the main body 29a engaged with the bed 3 side and the headstock 1.
It is composed of an eccentric portion 29c engaged with the 9 side, etc.

That is, as shown in FIGS. 4 and 5, the eccentric pin 29 has a diameter D1. It has a cylindrical main body 29a with a length Ll, and the upper side of the main body 29a in FIG. 4 has a diameter D2 and a length L2.
The cylindrical eccentric portion 29c has its axis CT5 aligned with the main body 29a.
The eccentric portion 29c is offset by a predetermined eccentric amount L3 with respect to the axis CT4, and a hexagonal columnar head 29b is formed on the upper side of the eccentric portion 29c in FIG. The main body 29a of the eccentric pin 29 is rotatably engaged with a circular engagement hole 3b formed in the mounting surface 3a of the bed 3, as shown in FIGS. 4 and 5. On the other hand, the eccentric portion 29c of the eccentric pin 29 is an elliptical engagement hole J19a formed on the lower surface of the headstock 19 in the Z-axis direction perpendicular to the plane of FIG. 4, that is, in the direction of arrows E and F in FIG. is slidably engaged with.

In addition, in the bed 3 portion of the headstock 19 at the lower left in Fig. 3,
A main shaft drive motor 25 is provided, and a rotation transmission means 26 consisting of a plurality of pulleys, belts, etc. is provided between the main shaft drive motor 25 and the main shaft 21, as shown in FIGS. 2 and 3. It is being Therefore, the main shaft drive motor 25
By rotating in the forward and reverse directions, the rotation transmitting means 2
6 to the main shaft 21 with the arrow M centered on the axis CT3,
8. Rotationally driven in the N direction. In addition, the headstock 19
A support bolt 27 is provided in the lower part of the bed 3 in FIG. 3 to supplementally support the headstock 19 from below.

Since the compound machining lathe has the above configuration, when machining the workpiece 23 using the compound machining lathe,
As shown in FIG. 2, a @5 spindle hair movement motor 2 has a workpiece 23 to be machined mounted on the spindle 21 via a chuck 22.
5 to rotate the main spindle 21 together with the workpiece 23 in the direction of arrow M or N about the axis CT3 via the rotation transmission means 26. After mounting the workpiece 23 via the shaft 22, the main shaft 21 is moved by the arrow M or N by C-axis control.
Control rotation in the direction. ), in that state, the tool changer i
24, tools are exchanged between the tool magazine 14 and the tool holding parts 18a, 18b of the turret 18, and the turret 18 is also driven to rotate as appropriate in the directions of arrows U and 3 about the rotation axis CT7 shown in FIG. Tools used for machining 1
7 at a predetermined processing position. Further, by driving the servo motor 12 shown in FIG. 1, the tool rest 6 is appropriately moved on the carriage 5 in the directions of arrows A and B (X-axis direction), and the carriage 5 is moved together with the tool rest 6 as shown in FIG. The workpiece 2 is mounted on the main shaft 21 via the chuck 22 by the tool 17 mounted on the tool post 6 via the turret 18 by appropriately moving and driving in the direction perpendicular to the plane of the paper (Z-axis direction).
Various processes are performed on 3.

At this time, in order to properly process the workpiece 23, the cutting edge 17a of the tool 17 mounted on the tool post 6 must be aligned with the axial center of the workpiece 23 mounted on the main spindle 21, that is, the axial center of the main spindle 21. It is necessary to maintain the state facing the direction intersecting CT3. Therefore, when assembling the multitasking lathe 1, the center height adjustment work (that is, the axis CT6 of the tool 17 when mounted on the tool rest 6 shown in FIG. Arrow C, which is the Y-axis direction from the moving surface 5b,
The center height H1 in the D direction and the turret sliding surface 5b of the carriage 5 between the axis CT3 of the main spindle 21 mounted on the headstock 19
The operation of matching the center height H2 in the same direction from

That is, by slightly loosening each bolt 20 that fixes the headstock 19 of the multitasking lathe 1 shown in FIG. 2 to the bed 3,
The fixed state of the headstock 19 to the bed 3 is released, and the headstock 19 is supported in contact with the support bolts 27 shown in FIG. The provided eccentric pin 29 is in a state in which its eccentric portion 29c is positioned at the lowermost position in the direction of arrows G and H in FIG. 3, that is, the rightmost position P1 in FIG. 4).
Using a suitable tool such as a hex wrench, the eccentric portion 29c is rotated in the direction of arrow Q or R about the axis CT5 via the head 29b of the eccentric pin 29 shown in FIG. Then, as already mentioned, the main body 29a of the eccentric pin 29 is engaged with the bed 3 via the engagement hole 3b, while the eccentric portion 29c of the eccentric pin 29 is engaged with the main shaft via the engagement groove 19a. Since it is engaged with the base 19, the eccentric portion 29c and the main body 29 of the eccentric pin 29 rotate in the direction of arrow Q or R about the axis CT5 of the eccentric portion 29c.
The eccentric pin 29, which is made up of parts such as a, rotates in the direction of the arrow S or T in FIG. 5 about the axis CT4 of the main body 29a. As already mentioned, the engagement groove L9a formed in the headstock 19 has an oval shape that is long in the direction of the fifth section arrows E and F (Z-axis direction), and the headstock 19 bed 3
Since movement in the directions of arrows E and F (Z-axis direction) is restrained by guide members provided in the directions of arrows G and H between The rotational motion in the S or T direction is converted into a linear movement motion of the headstock 19 in the direction of arrow G via the engagement groove 19a.

As a result, the headstock 19 linearly moves along the guide member in the direction of arrow C in FIG.
is in the direction of arrow G parallel to the mounting surface 3a of the bed 3, as shown in FIG.

The tool post 6 moves along a movement trajectory PAT1 (a direction intersecting at an angle β with the directions of arrows A and B, which are the movement directions of the tool post 6). Then, the center height H2, which is the height of the axial center CT3 of the main shaft 21 in the direction of arrow C in FIG.
Since it intersects the moving direction (directions of arrows A and B) at an angle β, it gradually decreases as the headstock 19 moves in the direction of arrow G.

In this way, due to the rotational movement of the eccentric pin 29 provided between the headstock 19 and the bed 3, the axis CT3 of the spindle 21 mounted on the headstock 19 moves along the movement trajectory PATI while decreasing its center height H2. along the line in the direction of arrow C in Figure 6,
A reference position P2 which is a literal meaning of the axis CT6 of the tool 17 positioned at the processing position on the turret 18 mounted on the tool post 6 in the directions of arrows A and B and the movement trajectory PATI of the axis CT3 of the main spindle 21. When the rotation of the eccentric pin 29 is stopped, the movement of the headstock 19 in the direction of arrow C in FIG.
The support bolt 27, which has been relatively separated in the direction of arrow C in FIG. In this state, each bolt 20 is tightened to firmly fix the headstock 19 to the bed 3 at the reference position P2. Then, the headstock 19 is securely fixed on the bed 3 in such a manner that the center height H2 of the axis CT3 of the main spindle 21 matches the center height H1 of the tool post 6 side. When H2 is securely fixed on the bed 3 in a manner that matches the center height H1 on the tool post 6 side, the center height adjustment work of the compound machining lathe 1 is completed, and the center height adjustment work of the compound machining lathe 1 is completed. Using this, the workpiece 23 can be properly machined using the machining procedure already described.

Note that fine adjustment is possible when adjusting the center height by rotating the eccentric pin 29 described above. That is, due to the rotational movement in the direction of arrow S or T about the axis CT4 of the eccentric pin 29 shown in FIG. When moved in the C direction by 1, for example, a distance, the axis CT3 is moved in the Y-axis direction perpendicular to the turret sliding surface 5b of the carriage 5, which is the center height direction (i.e., at an angle with respect to the arrow G direction). δ(=90−β)
(in the direction of the arrow that intersects with
Only = L-sin β (≦L) moves.

For example, when β=15°, L'=L-sin15
degree is 0.26L, and the spindle 2 is mounted on the headstock 19.
The axis CT3 of No. 1 moves in the arrow direction (Y-axis direction) by about 26% of the amount of movement in the arrow G direction. Therefore, fine adjustment is possible in adjusting the center height H2 in the Y-axis direction by moving the headstock 19 in the direction of arrow G.

In this way, the center height adjustment work of the multitasking lathe 1 can be completed by simply rotating the eccentric pin 29 provided between the headstock 19 and the bed 3, and fine adjustment is possible. Therefore, it is possible to easily perform high-precision center height adjustment work on a compound machining lathe without much effort. In addition, this center height adjustment work can be repeated as many times as necessary, so that the center height of the complex machining lathe t1, which has already been adjusted in center height, may change due to collisions during transport or machining. Even in the case of deviation, it is possible to perform the center height adjustment work of the compound machining lathe 1 again.

In addition, in the above-mentioned embodiment, as shown in FIG.
By installing the tool rest 6 on the bed 3 via a wedge-shaped carriage 5 so as to be movable and driveable at an angle β with respect to the mounting surface 3a of the bed 3, the tool rest 6 is attached to the tool rest 6 via the turret 18. As shown in FIG. 6, the axial center CT6 of the tool 17 along the directions of arrows A and B is inclined by the same angle β with respect to the mounting surface 3a of the blade 13.

Arrow G of the axis CT3 of the spindle 21 mounted on the headstock 19
, a compound machining lathe 1 in which a movement trajectory PAT1 along the H direction intersects the axis CT6 of the tool 17 at an angle β.
explained. However, the present invention can be applied to a multi-tasking lathe having any configuration as long as the five headstocks 19 are provided so as to be movable in a direction intersecting the moving direction of the tool rest 6. For example, by providing the headstock 19 so as to be movable in a direction oblique to the mounting surface 3a of the bed 3, and by providing the tool rest 6 so as to be freely movable and driveable in a direction parallel to the mounting surface 3a of the bed 3, the main spindle Platform 19
It is also possible to make the moving direction of the tool rest 6 intersect with the moving direction of the tool rest 6 at a predetermined angle.

(g) 1 As described in detail of the invention, according to the invention, a support such as a bed 3 having a mounting surface 3a formed in a first direction (for example, the direction of arrows G and H in FIG. 1) is provided. and a headstock 19 having a spindle 21 rotatably provided on the mounting surface 3a of the support body about a spindle axis such as an axis CTa orthogonal to the first direction. provided so that it can move in the direction of
A carriage 5 is provided on the mounting surface 3a of the support body so as to be movably driven in a second direction parallel to the spindle axis (for example, in the direction of arrows E and F in FIG. 2). A tool holding means such as a tool rest 6 having a tool axis center such as an axis Cr2 in a third direction (for example, the direction of arrows A and B in FIG. 1) perpendicular to the center and intersecting the first direction. Since it is configured to be movable, the center height of a machine tool such as the multi-tasking lathe 1 can be adjusted by moving the headstock 19 in the first direction intersecting the center of the tool axis. It becomes possible to easily adjust the center height of a machine tool without much effort. Therefore, as shown in Figure 7,
Grind the spacer 30 and move the tool rest 6 to the carriage 5 many times.
Compared to the traditional center height adjustment method that requires mounting on the
It is possible to greatly reduce the work required for adjusting the center height during assembly of machine tools, which can contribute to reductions in man-hours, personnel, and costs in the manufacturing process of machine tools. In addition, it is possible to easily adjust the center height not only when carrying eight loads of machine tools manufactured at the factory, but also when the center height of a machine tool that has already been adjusted becomes incorrect for some reason. Therefore, it is possible to provide a machine tool with excellent maintainability regarding center height adjustment.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing the main parts of a multi-tasking lathe to which an embodiment of the center height adjustment mechanism for a machine tool according to the present invention is applied, and FIG. FIG. 3 is a rear view of the bed and headstock that constitute the compound machining lathe shown in FIG. 1; FIG. 4 is a perspective view showing an example of the compound lathe shown in FIG. A front view of the vicinity of the eccentric pin part of the processing lathe. Figure 5 is a view taken in the direction of the V arrow in Figure 4. Figure 6 is a diagram showing the movement locus of the axis of the main spindle that makes up the multi-tasking lathe shown in Figure 1. Figure 7 is a view of the main spindle that makes up the conventional lathe. It is a front view showing an example of a stand and a tool rest. 1...Machine tool (combined power FF machine lathe) 3...
... Support body (bed) 3a ... Mounting surface 5 ... Carriage 6 ... Tool holding means (turret) 19 ...
- Headstock 21... Main spindle

Claims (1)

[Scope of Claims] A support body having a mounting surface formed in a first direction, and provided on the mounting surface of the support body to be freely rotatable about a main shaft axis perpendicular to the first direction. a headstock having a main shaft arranged so as to be movable in the first direction; a carriage provided on the mounting surface of the support body so as to be movable in a second direction parallel to the axis of the main shaft; A center height adjustment mechanism for a machine tool, wherein the carriage is movably provided with a tool holding means having a tool axis center in a third direction perpendicular to the main spindle axis and intersecting the first direction.