JPH077056Y2 - Tool fixing flange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an improvement of a tool fixing flange for attaching a tool such as a grindstone or a rotary knife to a shaft.

[Prior Art] As tool fixing flanges of this type, those shown in FIGS. 6 to 8 have been conventionally provided.

The tool fixing flange shown in FIG. 6 is located inside the flange body 1 in which a flange portion 1a having a diameter larger than that of the other end portion is formed at one end portion thereof and is close to the inner peripheral surface of the flange body 1 and has the same inner periphery. A hydraulic chamber 2 that is separated from the surface by a substantially constant distance is formed over the entire circumference, and a flow passage 3 that communicates with the hydraulic chamber 2 and the side surface of the flange main body 1 is provided inside the flange main body 1, and the opening of the flow passage 3 is formed. A piston (supply mechanism) 4 is fitted to the end portion, and a screw member (supply mechanism) 5 that presses the piston 4 from the outside is attached. Reference numeral 6 in the figure is an O-ring.

For example, a rotary knife 7 is attached to the flange 1a by bolts 8 on the tool fixing flange, and is fitted around the shaft in this state. When fixing the tool fixing flange, the piston 4 is moved to the hydraulic chamber side by tightening the screw member 5, and the working oil is supplied to the hydraulic chamber 2 so that the inner circumferences of the hydraulic chamber 2 and the flange body 1 are A wall portion between the surface and the surface is projected toward the inner peripheral side, and thereby, the shaft is clamped and fixed.

Further, the tool fixing flange shown in FIG. 7 is one in which two hydraulic chambers 10 and 10 are continuously provided in the axial direction of the flange body 1, and by tightening the outer periphery of the shaft at two places, the rotary knife 7 It has improved squareness and stability.

Further, the tool fixing flange shown in FIG.
By forming the convex portion 12 on the inner peripheral side wall portion of the central portion in the axial direction, the strength of the wall portion is increased.

[Problems to be solved by the invention] By the way, when cutting with a rotary knife, the shaft or the like easily vibrates, and the vibration is directly transmitted to the cutting edge of the rotary knife made of brittle material such as cemented carbide. This caused chipping and the like, which was a cause of the short life of the rotary knife. However, no measures have been taken against vibration in the above-mentioned conventional tool fixing flange. For this reason, there has been a strong demand for a tool fixing flange which is less likely to generate vibration and which can damp the vibration transmitted from the shaft or the like. Further, in the tool fixing flange having the hydraulic chamber as described above, the volume of hydraulic oil changes due to the temperature difference between summer and winter. Therefore, it is very uneconomical to increase the number of pistons and to adjust the amount of hydraulic oil in summer and winter.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a tool fixing flange in which vibration is unlikely to occur and the manufacturing cost and the like can be reduced.

[Means for Solving the Problems] The tool fixing flange of the present invention is one in which a surface is slightly separated from the inner wall surface of the hydraulic chamber, and a solid object for forming an oil film is provided in the inside of the hydraulic chamber. is there. The distance between the surface of the solid object and the surface of the hydraulic chamber should be 0.5 mm or less in order to effectively damp the vibration of the flange body due to the flow resistance due to the viscosity of the working oil flowing between them. desirable.

[Operation] In the tool fixing flange having the above-described configuration, the working oil interposed between the inner wall surface of the hydraulic chamber and the surface of the solid material is in a thin film-like state. Therefore, when the flange body vibrates, this vibration is transmitted from the oil film to the solid matter. However, since the natural frequency of the solid object is different from the frequency of the flange body, the two types of vibrations cancel each other out, and the vibrations are damped.
Further, since the solid material is provided, the amount of hydraulic oil is small, and the volume change due to temperature change is small.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG. 1 is a side sectional view showing a tool fixing flange of the embodiment.

In the figure, reference numeral 20 is a flange main body. Flange body
20 has a cylindrical shape, and a flange portion 21 having a larger diameter than the other end portion is formed at one end portion thereof. Inside the flange main body 20, a hydraulic chamber 22 is formed over the entire circumference in the vicinity of the inner peripheral surface of the flange main body 20 and at a substantially constant distance from the inner peripheral surface. Also, inside the flange body 20,
Cylinder part (flow path) that opens to the outer peripheral surface of the flange body 20
23 is formed, and the cylinder portion 23 and the hydraulic chamber 22
Is communicated by. A piston 25 is slidably fitted inside the cylinder portion 23. Also, the cylinder part
A lid 26 is attached to the opening of 23, and a screw member 27 whose tip is pressed against the piston 25 is attached to the lid 26. With respect to the above points, the configuration is almost the same as the conventional one.

However, a plurality of solid objects 28 are housed inside the hydraulic chamber 22 side by side in the axial direction and the circumferential direction. The distance between the surface of the solid object 28 and the inner wall surface of the hydraulic chamber 22 is preferably set to 0.5 mm or less. That is, it is intended to suppress the vibration of the flange main body by effectively consuming the energy of vibration due to the flow resistance due to the viscosity when the hydraulic oil flows through the minute gap between the solid matter and the wall surface of the hydraulic chamber. It is a thing. Therefore, if the gap is set to 0.5 mm or less, the vibration damping effect can be effectively exhibited.

In this case, the gap between the solid object and the wall of the hydraulic chamber should be 0.5m.
As a method to set m or less, the radial dimension of the solid object is set to 0 with respect to the radial dimension of the hydraulic chamber.
It should be formed as small as 5 mm. As a result, the gap between the solid body and the wall surface of the hydraulic chamber can be set to 0.5 mm or less, regardless of which side of the solid body is displaced inward or outward in the radial direction.

Also, in the tool fixing flange that is driven to rotate,
Since the solid matter is moved outward in the radial direction by the centrifugal force associated with the rotation, the gap size between the solid matter and the wall arranged radially outward of the wall surface of the hydraulic chamber is: It is always set to 0.5 mm or less. In this case, a thin oil film is always formed between the solid object and the wall surface microscopically, and the vibration isolation is achieved to that extent.

In addition, the gap between solid objects can be adjusted by inserting an elastic body such as a spring that movably connects both solid objects.
It can be set to 0.5 mm or less, and even in this case, effective vibration damping can be achieved.

The material of the solid material 29 is not limited at all, and various metals or non-metals such as heavy metal having high damping ability may be adopted. Further, in order to facilitate the movement of the hydraulic oil when operating the piston 25, a groove or a hole may be formed on the surface of the solid substance 28.

In the tool fixing flange configured as described above, the oil film 29 is formed between the inner wall surface of the hydraulic chamber 22 and the surface of the solid object 28. Therefore, when the flange body 20 vibrates, this vibration causes the oil film to move.
It is transmitted from 29 to solid object 28. In this case, since the natural frequency of the solid material 28 is different from the frequency of the flange body 20, the two types of vibrations cancel each other out, and the vibrations are damped. Therefore,
Vibration is rarely transmitted directly to the rotary knife 7,
It is possible to prevent chipping of the blade edge and extend the life of the rotary knife 7. Further, since the solid material 28 is provided, the amount of hydraulic oil is small, and as shown in FIG. 5, the volume change due to temperature change is small. Therefore, the number of pistons 25 can be reduced, the flange for fixing the tool can be made cheaper, and there is no need to adjust the amount of hydraulic oil in summer and winter, which simplifies the adjustment of the cutting tool. You can

Next, FIGS. 3 and 4 each show a modified example of the tool fixing flange. The one shown in FIG. 3 has a convex portion 12 provided on the inner peripheral side wall portion of the hydraulic chamber 30, and One in which a plurality of solid objects 31 are housed side by side in the radial direction and the circumferential direction inside the hydraulic chamber 30, the one shown in FIG.
Solid objects 41 are arranged side by side in the circumferential direction in 40. Even with such a tool fixing flange, the same effect as described above can be obtained.

[Effect of the Invention] As described above, in the tool fixing flange of the present invention, the hydraulic chamber is provided with a solid object whose surface is slightly separated from the inner wall surface of the hydraulic chamber. When an oil film is formed between the inner wall surface of the chamber and the surface of the solid body and the flange body vibrates, this vibration is transmitted from the oil film to the solid body, and the vibration of the solid body and the vibration of the flange body cancel each other out. Decay. Therefore, the vibration is not directly transmitted to a tool such as a rotary knife, chipping of the cutting edge can be prevented, and the life of the tool can be extended. Further, since the solid material is provided, the amount of hydraulic oil is small and the volume change due to temperature change is small. Therefore, the number of pistons can be reduced, the tool fixing flange can be made cheaper, and there is no need to adjust the amount of hydraulic oil in summer and winter, and adjustment of the cutting tool can be simplified. The effect that it can be obtained is obtained.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention.
FIG. 1 is a side sectional view of a tool fixing flange, FIG. 2 is a lateral sectional view thereof, and FIGS. 3 and 4 show modified examples of those shown in FIG. ,
FIG. 5 is a diagram showing the relationship between temperature and the amount of oil in the hydraulic chamber, and FIGS. 6 to 8 are side sectional views showing a conventional tool fixing flange. 20 …… Flange body, 21 …… Flange part, 22,30,40 ……
Hydraulic chamber, 23 ... Cylinder part (flow path), 24 ... Flow path, 25 ...
… Piston (supply mechanism), 27 …… Screw member (supply mechanism), 28,31,41 …… Solid object

Claims (1)

[Scope of utility model registration request] 1. A hydraulic chamber, which is attached to a shaft and is rotated around an axis, is surrounded by a hydraulic chamber which is close to an inner peripheral surface of the flange main body and is separated from the inner peripheral surface by a substantially constant distance. Is provided on the inside of the flange main body, and a flow path communicating with the hydraulic chamber and the surface of the flange main body is provided, and the hydraulic oil is supplied to the hydraulic chamber at the opening end of the flow path. In the tool fixing flange provided with a supply mechanism for projecting the wall portion between the chamber and the inner peripheral surface to the inner peripheral side, inside the hydraulic chamber, the surface is slightly separated from the inner wall surface of the hydraulic chamber, A tool fixing flange, characterized in that a solid material forming an oil film is provided therebetween.