JPS6040322B2 - Machine tool bar steady rest device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a machine tool, particularly to a machine tool steady rest device for a turning machine tool for working with bamboo wood.

As shown in FIG. 1, a conventional turning machine tool for birch wood work has a chuck 2 for grasping birch wood attached to the front end of a main shaft 1.
The gripping claw 3 grips and processes the workpiece 4, but if the equipment is bent or the cutting force during processing causes the barb material to vibrate as the spindle rotates, the machining accuracy of the machined workpiece may be affected. There are some defects that have a negative impact on the Therefore, generally, as shown in FIG. A method is adopted to suppress vibrations. However, with this method, it is difficult to maintain the gap between the tube 5 and the ayamura 4 at a suitable size due to variations in the outer dimensions of the bamboo wood and bends in the equipment. Therefore, it was difficult to suppress vibration effectively. Furthermore, when the diameter of the bamboo material 4 changes, it must be replaced each time with a tube that matches the outer diameter of the material 4, so many types of tubes are required, and the replacement work is complicated, which improves work efficiency. It was an obstacle at the top. The present invention
A collet sleeve is inserted into the draw tube that elastically displaces to grasp the material, and by using the reciprocating motion of the draw tube to open and close the chuck, when the draw tube moves in the direction of closing the chuck, the collet sleeve The collet sleeve is elastically deformed by the provided engaging part village,
The birch wood is tightened so that the main shaft and the birch wood rotate integrally, thereby reliably suppressing the vibration of the ayamura during rotation of the main shaft.

Therefore, in the Kabamura steady rest device of the present invention, when the Kabamura is inserted into the collet sleeve or sent out, the collet sleeve is expanded, so even if there is any looseness in the Kabamura material, the collet sleeve is expanded. There is no obstruction, and the collet sleeve elastically deforms when the main shaft rotates to integrate the main shaft and the bran material, so it has a great vibration suppressing effect, especially in the case of high-speed rotation of the bran. Furthermore, since the collet sleeve elastically deforms and tightens the birch wood, it can be commonly used for birch wood with a certain range of diameters, and is useful for shortening setup time. The drive source uses a conventional drive source for opening and closing the chuck, so it can be easily modified and the price is low. By actually measuring the change in the vibration of the twill material when the vibration is applied, extracting several points with large amplitudes, and installing elastic deformation parts of the collet sleeve at multiple locations corresponding to those points, it is possible to more effectively control the vibration of the twill material. vibration can be suppressed.

Embodiments of the birch steady rest device of the present invention will be described in detail below with reference to the drawings.

FIGS. 3 to 5 show the steady rest device of the present invention.
First, as shown in FIG. 3, the main shaft 1 is rotatably supported on the headstock 6 by bearings 7A and 7B. A chuck 2 for grasping bamboo wood is attached to the front end of the main shaft 1 with bolts. A shifter 8 is inserted into the center of the chuck 2 so as to be slidable in the direction of the spindle axis, and three master jaws 9 and the outer periphery of the shifter 8 are fitted to the front surface of the chuck 2 so as to be slidable in the radial direction. The wedge portion 8A of is wedge-engaged,
The structure is such that when the shifter 8 moves in the direction of the spindle axis, the master jaw 9 slides in the radial direction. A soft jaw (grasping claw) 3 is attached to the front surface of the master jaw 9 with a bolt, and grasps the bamboo material 4. At the rear end of the main shaft 1,
A cylinder 1 is attached via an adapter 0, and a piston 12 is slidably disposed within the cylinder 11 in parallel to the main shaft axis.

The draw tube 13 screwed onto the front end of the piston 12 has its front end side screwed onto the shifter 8 described above. Therefore, the shifter 8 reciprocates due to the reciprocating movement of the piston 12, opening and closing the grasping pawl 3. An adapter 14 is bolted to the rear end of the cylinder 11, and a bamboo material 4 is attached to the adapter 14.
A ring-shaped collar 15 having an inner diameter slightly larger than the outer diameter is attached with bolts. Further, a collet sleeve 16 is screwed onto the front side of the adapter 4 so that its position in the axial direction of the main shaft can be adjusted. As shown in the perspective views of FIGS. 3 and 5, the collet sleeve 16 has three tongue-shaped collets 17A at two locations on the front side and two on the rear side.
~17C "18A~18C are formed.

The tongue-shaped collets 17A to ITC, 18A to 18C are made by slotting the tubular collet sleeve 16 in the longitudinal direction at three equal parts to make it easy to elastically deform in the radial direction. The shape of the collet is not limited to the embodiments of the present invention, and may be any shape as long as it can be elastically deformed so as to be able to grasp bamboo having a diameter within a certain range. Engagement protrusions 19A to 19C, 2QA to 20 are provided on the outer periphery of the tongue-shaped collets 17A to 17C, 18A to 18C at approximately intermediate portions in the longitudinal direction.
C is welded. Engagement protrusions 19A to 19C, 20A
~20C has forehead slopes 21A~21C, 22 before and after it.
A to 22C are formed, and flat surfaces 23A to 23C are formed in the middle part.
, 24A to 24C are formed. Draw tube 1
3, the front engaging protrusions 19A to 19A described above are equally divided into three positions.
Rectangular cutout windows 25A to 25C into which the windows 19C fit are formed. The cutout windows 25A to 25C are formed larger in both width and length than the engagement protrusions 19A to 19C. In the present invention, the collect sleeve 16 is loosened by the reciprocating movement of the draw tube 13 when opening and closing the chuck.
Do. - When the tube 13 is at the forward end and the chuck is open, the collet sleeve 16 must be loose. Therefore, when screwing the collet sleeve 16 into the adapter 4, the piston 12 should be extended to the forward end, and the engagement protrusion 19A on the front side should be positioned exactly as shown in FIG.
- Enoki slopes 21A to 21C on the front side of 19C and cutout window 25
Adjust the amount of screwing so that there is a slight gap between greens 26A to 26C on the front side of A to 25C. Also, at this time, the front inclined surface 22 of the rear engaging projections 20A to 20C
A to 22C have the same gap formed between them and the chamfered portion 27 at the rear end of the piston 12. Further, as shown in FIG. 4-A and FIG. 4-B, pads 28A-28C and 29A-29C are provided on the front side of the tongue-shaped collets 17A-17C and the rear inner surface of the tongue-shaped collets 18A-18C. Attached with bolts.

The pads 28A to 28C and 29A to 29C are replaced when a rod material having a diameter exceeding the amount of elastic deformation of the tongue-shaped collects 17A to 17C and 18A to 18C is inserted.
FIG. 6 is an explanatory diagram for determining the longitudinal arrangement locations of the tongue collet and pad.

The figure shows the side where the pads and tongue collets are arranged so that the vibration when the twill material 4 rotates does not exceed 3. That is, as shown in Fig. 6A, if the collet pad is not tightened with the collet pad, the amplitude will exceed 3 when the length of the collet 4 increases to position 1. First pads 28A to 28C are arranged. Further, as shown in FIG. 6B, the bamboo wood 4 is
When the amplitude exceeds 28C and reaches the 0 position, the amplitude becomes 3 again.
Therefore, the second pads 29A to 29C are placed at this position. Further, as shown in FIG. 6C, when the comb material 4 extends beyond the pads 29A to 29C to a position m, the amplitude again exceeds 3, so the collar 15 is placed at this position m. Of course, this position m may also be tightened by the above-mentioned tongue-shaped collet and pad. As a result, as shown in FIG. 6D, the amplitude of vibration can be reliably suppressed to below a permissible value regardless of the length of the shank material 4. Next, the operation of the rattan steady rest device of the present invention will be explained with reference to FIG.

As shown in FIG. 3, while the piston 12 is advanced and the grasping claw 3 is opened, the comb material 4 is sent out by a required length by a comb feeding device separately placed behind the headstock 6. When the piston 12 is retracted after the feeding is completed, the notch windows 25A to 25C are opened at the point where the piston 12 is slightly retracted.
The green 26A to 26C on the front side are the engagement protrusions 19A to 1 on the front side.
It comes into contact with the front inclined surfaces 21A to 21C of the collets 9C, and causes the tongue-shaped collets 17A to 17C to protrude inward. At the same time, the chamfered portion 27 at the rear end of the piston 12
The tongue-shaped collector 18 contacts the front inclined surface 22A of 0C.
Place A to 18C inside. The tongue collets on the front and rear sides have considerable mirror clearance, so pads 28A to 28C,
Even after 29A to 29C come into contact with the outer periphery of the rod material 4, the tongue-like collets continue to mirror and elastically deform into an arched shape. When the flat surfaces 23A to 23C of the front leg engagement projections 19A to 19C and the flat surfaces 24A to 24C of the rear engagement projections 20A to 20C contact the inner surface of the draw tube 13 and the piston 12, respectively, no further Even if the draw tube 13 retreats, the tongue-like collection does not collapse. Draw tube 1 until this state
3 retreats, the grasping claws 3 grasp the twill material 4. Therefore, the grasping claw 3 has a flat surface of each protrusion on the draw tube 1.
The radial position of the birch material 4 is adjusted in advance so that the birch material 4 is not grasped until it comes into contact with the inner surface of the piston 12 and the birch material 3. By employing such a method, even if there are variations in the diameter of the shank material 4, it is possible to always stably tighten the shank material. Therefore, the bamboo material 4 rotates together with the main shaft 1, and even if the main shaft is rotated at high speed, rotation with less vibration can be obtained. Once the machining of the birch wood is completed, the piston 12
When the gripping claw 3 is moved forward, the rear tongue-shaped collet 17 is opened.
A to 17C and 18A to 18C also return to their original released states, and the next bamboo material feeding operation is performed. As described above, the present invention is not limited to the configurations shown in the embodiments, and modifications are expected without departing from the technical idea of the present invention as described in the claims.

[Brief explanation of the drawing]

1 and 2 are sectional views showing a conventional birch wood steady rest device, and FIG. 3 is an overall sectional view of the birch wood steady rest device of the present invention.
Figure 4-A is an enlarged sectional view of part A in Figure 3, Figure 4-B is a right side view of Figure 4-A, Figure 5 is a perspective view of the collet sleeve and draw tube, and Figure 6 is the tongue. FIG. 4 is an explanatory diagram for determining the longitudinal arrangement locations of a shaped collet and a pad. In the figure: 1... main shaft, 2... chuck for grasping bamboo wood, 3... grasping claw, 4... bamboo wood, 6...
...head stock, 11... cylinder, 12... piston, 13... draw tube, 15... force roller, 1
6...Collection sleeve, 17A-17C, 18A-1
8C...Tangular collet, 19A to 19C, 20A,
20C...Engaging protrusion, 21A to 21C, 22A
~22C...around slope, 23A~23C, 24A~24C
...Flat surface, 25A-25C ... Notch window, 26A-26C ... Front edge, 28A-2
8C, 29A~29C...Putted. Younger brother, Figure 2 Figure 3 Figure 4-A Figure 4-B Figure 5 Figure 6

Claims (1)

[Claims] 1. A main shaft rotatably supported by a headstock and having a through hole in the direction of the main shaft axis, a chuck for grasping a bar attached to the front end of the main shaft, and a chuck cylinder attached to the rear end of the main shaft coaxially with the main shaft axis. A cylindrical piston is provided within the chuck cylinder so that it can reciprocate in the direction of the spindle axis on the same axis as the main spindle, and the piston and the bar gripping chuck are inserted into the through hole of the spindle. a draw tube connected so as to be coaxial with the main shaft axis, and a collect sleeve attached to the chuck cylinder and inserted into the inside of the draw tube so as to be coaxial with the main shaft axis, and grasping the inner bar material. , an engaging member provided on a draw tube that reciprocates with the piston and engages with the collect sleeve to move the collect sleeve inwardly, the draw tube is connected to the bar grasping chuck. 1. A bar steady rest device for a machine tool, wherein the engaging member engages with the collect sleeve at a position where the lever is actuated in the closing direction, and the engaging member is actuated in the direction to close the collect sleeve.