JPS59219103A - Spindle device - Google Patents

Abstract

PURPOSE:To improve precision of the spindle device as well as to make it compact, by incorporating a cutter feed-in mechanism in the spindle body. CONSTITUTION:The spindle body 3 is rotated by a high-frequency motor 2 incorporated in the center portion of the device body 1. The spindle body 3 is connected by bolts 9 to a flange 6 having a hollow shaft 4 and eccentic through- holes 5 and to a sleeve 8 provided between them. The cutter holder 10, which is mounted rotatably and eccentrically in the rotating spindle body 3, is rotated in relatively independent relation to the spindle body 3, so that the cutter 14 at the tip of the cutter holder 10 is fed in toward the work (not shown).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a machine tool, and particularly to a spindle device for a small lathe or the like intended for machining mass-produced miniature parts.

Conventionally, in order to cut a certain groove in a small cylindrical workpiece with a diameter of several millimeters, the mainstream technology was to move the entire tool post to make a cut with the cutting tool. Since the depth of cut is relatively small and the turret itself is extremely heavy, it is difficult to set the amount of movement of the turret, which limits machining accuracy.
Furthermore, due to the structure of the mechanism that feeds the cutting tool in the axial direction, there is a drawback that the entire device tends to be complicated and large.

Furthermore, conventionally, when turning small-diameter miniature parts by rotating the workpiece and fixing the cutting tool (with respect to the circumferential direction of the workpiece), there is a limit to the turning speed determined by the rotation speed of the spindle. This results in a decrease in ability and work efficiency.
It was not suitable for mass production.

In view of the above-mentioned drawbacks of the conventional device, the present invention has been improved, and a bi-holder is rotatably mounted eccentrically within the rotating spindle body, and this hide boulder is fixed relative to the spindle body. To provide a device that allows a cutting tool at the tip of a cutting tool holder to cut into a workpiece by rotating it independently; in short, a compact and highly accurate device that incorporates a cutting feed mechanism for the cutting tool into the spindle body. We aim to provide the following.

The structure of the present invention will be explained below according to the embodiments shown in the drawings. In Figures 1 to 5, (1)
(2) is a high-frequency motor incorporated approximately in the center of the device body. (3) is a spindle body rotated by a high-frequency motor (2), which includes a hollow shaft (4) and an eccentric through hole (5) shown in Figures 3 and 4.
) with flanges (6) (7) and flanges (6) (
7) and a sleeve (8) disposed between the two are connected by bolts (9). (10) are these through holes (5)
It is a hide holder attached via a seal (11) and bearings (12) (13) inside, and a bi-l-(1) at the tip.
4), and the rear part is formed hollow (15), and as shown in the exploded view in Fig. 5, a lead groove (15) having a predetermined angle with respect to the axial direction is formed on the circumferential surface facing the axis passing through the axis. 16) (16) is drilled. (17) is the hollow part of the shaft (4) which is rotated by the high frequency motor (2), and the part of the bite boulder.
(10) is a rond that is inserted through the hollow (15), and has a pin member (18) extending in a direction perpendicular to the axial direction at its tip, and this pin member (1B) is connected to the tool holder ( The sleeve (8) that constitutes the spindle body (3) passes through the lead groove (16) (16) of the spindle body (3).
) is drilled in the inner diameter surface along the axial direction;・
The groove (19) (1,9) is interposed, and the piece (20) (
20) through this straight groove (19) (19)
comes into contact with. This constitutes a so-called 2-bottom joint type shaft joint (see Fig. 3).

(21) is a cam means provided at the rear of the device body (1), which controls the axial direction of the rond (17), and moves the tool holder (10) to the spindle body (3) as described below.
Workpiece (22) (4th
(see figure), (14) is cut or retracted. The cam means (21) has a housing (23) built into the rear side of the device body (1) so as to be slidable in the axial direction, and a housing (23) that is built into the housing (23) so as to be slidable in the axial direction within a predetermined range. The shaft member (24) and the shaft member (24) are screwed together in the housing (23).
(17) A spring (
25), a socket (26) which is fitted to the shaft part jfA' (24) and comes into contact with the rear end surface of the housing (23), and a cam lug lower attached to the shaft member (24). (27
), a cam (28), a drive motor (29) that rotates the cam (28), and a spring (30) that pulls the housing (23) toward the node (14) on both sides of the device body (1) ( (see FIG. 2), and a bearing (31) (31) that supports the rond (17) within the housing (23). Then, there is a dovetail ti'Jl fM (34) between the slide FW of the device body (1), the material (32) and the heath (33).
A cam follower (35) that comes into contact with the outer circumferential surface (28a) of the cam (28) is attached to the slide member (32), and the rotation of the cam (2nd) moves the device body (1) onto the workpiece (22). It is configured so that it can be moved in the feeding direction.

In short, the main body device rotates the cam (28), and the bite (
14) relative to the workpiece (22).
) It is configured to provide radial depth of cut and feed.

The operating state of the shuttle is explained below. First, work (22)
is fixed by a support device (not shown) in alignment with the rotation center Oλ of the spindle body (3), and the high-frequency motor (2) is driven to move the spindle body (3), the aforementioned two-point joint (17) and the tool holder ( 10) are rotated integrally. In this state, the tips of the cutting tools (14) of the high 1 to holder (10) are eccentric by a predetermined amount, with the center Oλ of the cutting tool holder (14) etched into the flange (6) of the spindle body (3). Therefore, the point A in FIG.
), and the rotation of the rond (17) is absorbed by the bearings (31) of the housing (23), which are separated from the shaft member (24). From this state, the drive motor (29) moves the cam follower (27)
While keeping the distance between the cam follower (35) and the cam follower (35) at a constant distance,
The cam (
2B) Rotate. The housing (23) is pulled leftward in Fig. 1 by the springs (30) (30) arranged on both sides of the device body (1), and the shaft portion +J'
(24) is energized in the housing (23) in the left direction in the figure, so the main body (1) of the device is attached to the cam follower (2).
7) While the position is regulated by (35), the cam outer peripheral surface (
28a) and slides to the left on the base (33). In other words, send it to the cutting tool (14) (workpiece (22
) is given. When the high l-(14) is fed a predetermined distance, the cam (28) is moved within the range of the cam shape where the diameter of the outer circumferential surface (28a) remains and the diameter of the cam inner circumferential surface (28b) is reduced. When rotated, the cam follower (27) is pushed away from the cam follower (35) against the spring (30) (30), that is, to the right in the drawing, and the shaft member (24),
The rond (17) is moved in both directions via the housing (23) and the bearings (31) (31).

The pin member (18) of the rondo (17) is rotating together with the spindle body (3) due to the two-pot joint mechanism.
Also, the straight groove (19) of the sleeve (8) (19
) and move in the same direction. However,
This pin member (18) is connected to its lead groove (16) (1
The hide holder (10) inserted through the sleeve (6) is prevented from moving in the axial direction by the bearings (12) and (13) that support it and the annular protrusion (10a) that is secured to the inner step of the sleeve (8). Since the lead groove (1(i) (1
G) independently rotates relative to the spindle body (3). This rotation is shown in Figure 5 as a rondo (
The rotation is in the (0) direction relative to the movement in the (a) direction of 17), and in FIG. The workpiece (22) centered on is approached, that is, cut into. In the figure, point B is the position where the piezo (14) starts turning the workpiece (22) as the bite boulder (10) rotates, and point 0 is the position where the full depth of cut is completed.

All that is left to do is to further rotate the cam (28) with the drive motor (29) and return the cam followers (27) and (35) to their original states.The above operation is reversed and one cycle of turning process is completed. do. Although the case where the outer diameter surface of the workpiece (22) is turned has been described above, the inner diameter surface can also be turned in the same manner.

In summary, the present invention includes a spindle body that is rotationally driven by a high frequency motor or the like and has a straight groove along the axial direction, and a spindle body that is eccentrically pushed into the spindle body so as to be rotatable, and that is rotated at a predetermined angle with respect to the axial direction. A cutting tool holder having a lead groove to perform
The main component is a rond that includes a pin member that passes through the leat groove and engages with the straight groove, and the pin member transmits the rotation of the spindle body to the tool holder, and the rond is connected to the cutter, means, etc. By displacing the tool in the axial direction through the tool, the tool holder can be rotated relative to the spindle body, and the tool attached to the tool holder can perform a cutting operation on the workpiece. A new device incorporating a cutting mechanism is provided, and its construction is compact and simple, and an improvement in machining capacity can be expected. In addition, since the cutting tool rotates along the outer circumference of the workpiece while making a cut, it is ideal as a device for mass production of small diameter miniature parts for measurement, light electrical equipment, etc., and has higher turning capacity and work efficiency compared to conventional methods. can be significantly improved.

[Brief explanation of the drawing]

ff11 is a vertical cross-sectional view showing the entire device according to the present invention,
Figure 2 is a plan view, Figure 3 is a sectional view taken along line X-X in Figure 1, Figure 4 is an open front view of the tool holder, tool, flange, and workpiece, and Figure 5 is the development of the tool holder. It is a diagram. (3) - Spindle body, (10) - Hide boulder -
1 (16) (16L-Lead groove, U7) -Loft, (2B)-Cam, (27) -Cam follower, (14
) - byte, (22) - work. Patent applicant: NCH N Toyo

Claims (1)

[Claims] (1) A spindle body that is rotationally driven by a high-frequency motor or the like and has a straight groove along the axial direction, and a lead that is rotatably inserted eccentrically into the spindle body and makes a predetermined angle with respect to the axial direction. Bite boulder with grooves
and a rond having a pin member installed in the tool holder and penetrating the lead groove and engaging with the straight groove, and transmitting the rotation of the spindle body to the tool holder with the pin member, By displacing this iron in the axial direction via a cam means or the like, the tool holder is rotated relative to the spindle body, and the tool attached to the tool holder is caused to perform a cutting operation into the workpiece. A spindle device characterized by: