JPH0229442B2 - KYUMENKAKOSOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention allows various spherical surfaces with different radii to be formed on a workpiece by changing the intersection angle between the axis of the tool spindle and the axis of the workpiece support spindle. The present invention relates to a spherical surface machining device.

To machine a spherical surface formed on a workpiece, as shown in Fig. 1a and b, the workpiece W is supported on the tip surface of the workpiece support spindle A, and the tip is placed at a position offset from the rotation center line S. The tool spindle B with the tool C attached to the surface is rotated with respect to the workpiece support spindle A so that the rotation center line S of the tool spindle B and the rotation center line P of the workpiece support spindle A intersect at a predetermined angle θ. This is done by rotating both main shafts A and B at the same time after placing the cut and making a predetermined cut. In this case, the workpiece W
The finishing radius R of the spherical surface is expressed as R=r/sinθ, where r is the eccentricity of the cutting edge of the tool C from the rotation center line S, and since r is constant, R1=r/
sin θ1, R2 = r/sin θ2, therefore, by changing θ, a spherical surface with an arbitrary radius R can be machined.

By the way, in such spherical machining, since the thickness of the peripheral edge of the workpiece is uniform,
Conventionally, as shown in Fig. 1a and b, a workpiece support is formed by tilting the workpiece support surface by a predetermined angle corresponding to the radius of the spherical surface to be machined with respect to the mounting surface to the workpiece support spindle A. Previously, a plurality of devices were prepared depending on the radius of the spherical surface to be machined, and a workpiece support device suitable for the radius of the spherical surface to be machined was selected and attached to the workpiece support spindle to support the workpiece. If this is done, there is a problem in that a number of workpiece support devices must be prepared depending on the type of spherical surface to be machined. The mounting surface of such a workpiece support device must be machined to have a high level of flatness so that it will not be deformed when the workpiece is fixed by suction, and it is difficult to perform such high-precision machining on multiple workpiece support devices. This led to increased costs and was uneconomical.

The present invention has been made in view of these conventional problems, and its purpose is to rotate the workpiece support device in a plane passing through the axis of the workpiece support spindle. The intersection angle of the workpiece support surface formed on the workpiece support axis with respect to the axis of the workpiece support spindle can be changed, and even when machining various spherical surfaces with different radii, the workpiece can be supported with a single workpiece support device. The purpose is to do so.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 7. In FIGS. 2 and 3, 1 is a bed, 2 is a slide base fixed on the bed 1, and 3 is a workpiece support head installed on the slide base 2 so as to be movable forward and backward. In this workpiece support head 3, a workpiece support main shaft 5 is rotatably supported on a workpiece support head main body 4, and a workpiece support face plate 6 is attached to the tip thereof. A vacuum chuck 7 is attached to the front surface of the workpiece support face plate 6 as a workpiece support device so as to be rotatable within a plane passing through the axis of the workpiece support spindle 5.

That is, as shown in FIGS. 4 to 6, a support block 4 having a mounting surface 40a parallel to the axis of the workpiece support spindle 5 is provided on the front surface of the workpiece support face plate 6.
0 is mounted eccentrically with respect to the axis of the workpiece support spindle 5, and the workpiece support spindle 5 is attached to the end of the mounting surface 40a of the support block 40 on the side far from the workpiece support face plate 6. A pivot shaft 41 perpendicular to the axis is fitted. A rotating block 42 having a protrusion 42a projecting toward the axis P of the workpiece support spindle 5 at the end farthest from the workpiece support face plate 6 is placed on the mounting surface 40a. A fitting hole drilled in the bottom surface of 42 fits into a protrusion of pivot shaft 41 . A chuck mounting surface 42c that intersects with the axis of the workpiece support spindle 5 is formed on the protrusion 42a of the rotating block 42 on the side far from the workpiece mounting face plate 6. A vacuum chuck 7 supporting W is fixed.

Further, the workpiece support face plate 6 of the rotation block 42
A holder 45 that rotatably supports the screw shaft 43 in a state perpendicular to the mounting surface 40a is fixed to the side end, and a holder 45 is fixed to the side of the support block 40.
A holder 47 that rotatably supports the engagement shaft 46 in a state perpendicular to the mounting surface 40a is fixed thereto, and the operating shaft 4 has a threaded end portion 48a screwed onto the engagement shaft 43.
The rear end narrow diameter portion of 8 passes through the diameter line of the engagement 46,
An operating knob 50 is attached to its tip. The tip of the operating knob 50 is engaged with the outer circumferential surface of the engagement shaft 46 , and the large diameter end surface of the operating shaft 48 and the operating knob 50 allow the operating shaft 48 to be moved in the axial direction with respect to the engagement shaft 46 . movement is regulated. Therefore, by operating the operating knob 50, the operating shaft 48
When rotated, the screw shaft 43 moves on the operating shaft 48, and as a result, the rotation block 42 rotates about the pivot shaft 41.

Moreover, 51 and 52 are clamp bolts, which are loosely fitted into a pair of arcuate grooves 53a and 53b with the axis of the pivot shaft 41 bored in the rotation block 42 as the arcuate center, and their threaded ends are supported. It is screwed into the mounting surface 40a of the block 40.

On the other hand, a pulley 8 is attached to the rear end of the workpiece support spindle 5, as shown in FIGS. 2 and 3.
A pulley 1 of a reducer that decelerates the rotation of a workpiece support shaft drive motor 9 fixedly installed on a support stand outside the bed 1
1 and belt transmission.

Reference numeral 12 designates a cutting handle, and a nut 14, which is integral with the workpiece support head body 4, is screwed into a feed screw 13 rotated by this handle. 15 is a flexible pipe for vacuum pressure connected to the rear end of the workpiece support shaft 5, and communicates with the vacuum chuck 7 through a hole in the shaft center.

Next, the tool support head 17 will be explained. The tool support head 17 is installed on the bed 1 facing the workpiece support head 3 so that the angle .theta. can be adjusted. Reference numeral 16 denotes a base fixed on the bed 1, and a pivot shaft 27 that rotates at a vertical pivot center O located on an extension of the axis of the workpiece support spindle 5 is supported on the base 16. 1
T-grooves 19 and 27 are provided on the upper surface of the rotary shaft 27 in the shape of an arc whose radius is the pivot center O of the pivot shaft 27. A tool support head main body 18 is connected to the upper surface of the base 16 and is connected to the pivot shaft 27 and a clamping bolt 21 that is guided in engagement with the T-grooves 19 and 20. It is placed so that it can rotate around O.

A tool spindle 23 is rotatably supported on the tool support head body 18, and a tool mounting face plate 24 facing the workpiece support face plate 6 is attached to the tip of the tool spindle 23. A tool 25 such as a cutting tool is attached.
Reference numeral 22 denotes a screw for fine adjustment, which positions the cutting edge of the tool 25 on the line of the pivot center O of the pivot shaft 27.

On the other hand, a pulley 26 is attached to the rear end of the tool spindle 23, and is belt-transmitted to a pulley 36 of a tool spindle drive motor 34. This tool spindle drive motor 34 is also installed outside the bed 1, and is installed to change its position following changes in the angle θ of the tool support head 17. That is, 3
Reference numeral 1 denotes a motor support stand, which has an arcuate shape.
The rotation shaft 27 is provided on the upper surface of this motor support stand 31.
A T-groove 32 having a circular arc whose radius is the rotation center O of the tool spindle drive motor 34 is provided, and a motor mounting base 33 integrally fixed to the lower surface of the tool spindle drive motor 34 is slidably mounted. It has a structure in which it is tightened and fixed by a clamping bolt 35 that is engaged and guided in a groove 32.

As shown in FIG. 7, a sector gear 28 is fixed to the rotation shaft 27, and a worm 29 meshes with the sector gear 28. A turning handle 30 is attached to one end of the worm 29, and an intersection angle between the axis S of the tool spindle 23 and the axis P of the workpiece support spindle 5 is formed by the turning handle 30, the sector gear 28, and the worm 29. It constitutes an adjustment mechanism that adjusts the

In the above embodiment, the tool support head 17 is rotated, but the workpiece support head 3 may also be rotated.

In the device configured as described above, when changing the finishing radius R of the spherical surface formed on the workpiece W, first loosen the clamping bolts 21 and 35, and operate the turning handle 30 to support the tool in the illustrated example. The device 17 pivots around the pivot center O of the pivot shaft 27, and the tool spindle drive motor 34 also pivots accordingly, so that the workpiece support spindle 5
The angle θ of the rotation center S of the tool spindle 23B with respect to the rotation center P of the tool A is set to an angle corresponding to the radius of the spherical surface to be machined.

Then, after loosening the clamp bolts 51 and 52, the rotation block 42 is rotated by operating the operation knob 50 and the workpiece support head 4 is moved to the cutting forward end as shown in FIG. In this way, the normal L passing through the center of the workpiece support surface 7a of the vacuum chuck 7 is in an angular state passing through the intersection OF of the axis S of the tool spindle 23 and the axis P of the workpiece support spindle 5. After this, the clamp bolts 51, 5
2 is tightened again to secure the pivot block 42 to the support block 40.

As a result, a spherical surface is created on the workpiece W with a uniform thickness at the periphery.

As described above, in the present invention, the workpiece support device that supports the workpiece is mounted so that it can rotate within a plane passing through the axis of the workpiece support spindle.
Even if the radius of the spherical surface to be machined changes, this can be handled by simply changing the mounting angle of the workpiece support device, compared to a system where the workpiece support device is replaced as the radius of the spherical surface to be machined changes. There is an advantage that it is not necessary to prepare a large number of workpiece support devices.

[Brief explanation of drawings]

Figures 1a and b are explanatory diagrams of spherical surface machining, Figures 2 to 8 show embodiments of the present invention, Figure 2 is a plan view of the spherical surface machining device, and Figure 3 is the same as in Figure 2. - line enlarged sectional view, Fig. 4 is an enlarged view taken from the direction of arrow in Fig. 3, Fig. 5 is a - line sectional view in Fig. 4, and Fig. 6 is - in Fig. 4.
7 is a cross-sectional view taken along the line -- in FIG. 3, and FIG. 8 is a diagram showing the state of the rotation block after angle adjustment. 1... bed, 3... workpiece support head, 5...
...Workpiece support spindle, 6...Workpiece support face plate, 9...
...Workpiece support spindle drive motor, 16...Base, 17...Tool support head, 19, 20...T
Groove, 21... Clamp bolt, 23... Tool spindle, 24... Tool support face plate, 25... Tool, 27
...Swivel axis, 30...Swivel handle, 40...
Support block, 41... Pivoting shaft, 42... Rotating block, 43... Screwing shaft, 45, 47... Holding member, 46... Engagement shaft, 48... Operating shaft, 50...
Operation knob, 51, 52... Clamp bolt, W...
...Workpiece.

Claims (1)

[Claims] 1. A tool support head that supports a tool spindle with a machining tool attached at an eccentric position on the tip surface, and a workpiece support head that supports a workpiece support spindle that removably supports a workpiece on the tip surface are connected to the tool spindle. The tool is installed so that the axis and the axis of the workpiece support spindle are located in the same plane, and a turning shaft is provided that supports the tool support head or the workpiece support head so as to be rotatable in a plane parallel to the plane. The tool support head or the workpiece support head is rotated about the rotation axis to adjust the intersection angle between the axis of the tool spindle and the axis of the workpiece support spindle, and to adjust the spherical radius of the workpiece produced by the processing tool. In the spherical surface machining device equipped with an adjustment mechanism for changing the workpiece, a rotating member that can rotate within a plane passing through the axis of the workpiece support spindle is provided on the tip surface of the workpiece support spindle, and the rotational member is A workpiece support device is attached to a surface facing the tool spindle end surface, and further, the rotating member is fixed with respect to the workpiece support spindle by restricting rotation within a plane passing through the axis of the workpiece support spindle. A spherical surface machining device characterized by being equipped with a clamping mechanism.