JP7528334B2 - Deburring tools - Google Patents

Description

The present invention relates to a deburring tool.

A deburring tool has been proposed that includes a shank that is attached to the spindle of a machine tool, a tool holding member that rotates integrally with the shank, and a support member that supports the tool holding member so that it can tilt freely relative to the shank axis and has a tilt biasing means that biases the tool holding member against the shank (Patent Document 1).

JP 2009-214234 A

When deburring using the deburring tool of Patent Document 1, the tool may vibrate. The present invention provides a deburring tool that is less susceptible to vibration.

The first aspect of the present invention is
a housing having a shank and a mechanism chamber disposed along a shank axis;
A plurality of transmission rods are arranged around the shank axis in parallel with the shank axis and fixed to the mechanism chamber;
A tilt shaft,
Flange part,
a receiving portion having an abutment surface, the receiving portion being disposed on the flange portion and through which the transmission rod passes; and
A rod portion is disposed on a tip side of the flange portion and holds a blade,
A tilt shaft is disposed along a tilt axis passing through the tilt center on the shank axis and can tilt around the tilt center;
Including,
the transmission rod is disposed on a plane perpendicular to the shank axis and passing through the tilt center, and has a bulge portion in contact with the abutment surface;
It is a deburring tool.

The tilt shaft may further include a tilt correction mechanism that, when the tilt shaft is tilted from the shank axis, rotates the tilt shaft in a direction opposite to the tilt direction so as to align with the shank axis.
The housing may have a seat, and the tilt shaft may have a spherical bushing supported by the seat and having a tilt center on the shank axis.

A deburring tool is attached to a machine tool such as a machining center, a turning center, etc., and is used as a rotating tool. The shank of the deburring tool is attached to a tool spindle, and the entire deburring tool rotates together with the tool spindle.
For convenience of explanation, the side on which the blade is attached is called the distal end side, and the side on which the shank is disposed is called the proximal end side.

The tilt correction mechanism includes:
A plurality of spring guides are arranged circumferentially on an outer circumferential side of the interior of the mechanism compartment and parallel to the shank axis;
The spring may include a plurality of coil springs that are disposed between a shank side surface of the inner surface of the mechanism compartment and the flange portion, and are inserted into the plurality of spring guides, respectively.

The tilt correction mechanism includes:
a push rod reciprocable along the shank axis;
an elastic member that biases the push rod toward the tilt shaft;
a conical surface provided at the tip of the push rod;
a pressing head disposed at a base end of the tilting shaft and having a hemispherical portion in contact with the conical surface,
The center of the hemispherical portion may be located closer to the shank than the tilt center.

The tilt correction mechanism includes:
a push rod reciprocable along the shank axis;
a pressing head disposed at a base end of the tilting shaft and abutting against a rotation center of the push rod;
an elastic member that biases the push rod toward the tilt shaft;
A first rolling groove is disposed on the blade side surface of the flange portion and extends in a radial direction;
a second rolling groove disposed on the blade side of the inner surface of the mechanism chamber and extending in a radial direction;
a ball inserted between the first rolling groove and the second rolling groove,
A distance in the shank axial direction between a bottom surface of the first rolling groove and a bottom surface of the second rolling groove may decrease from a radial center portion toward the radial outer side.

The push rod may move in the shank axial direction while being guided by the housing.
The push rod, the spherical bushing, the seat, the pressing head and the cutting tool are arranged on a shank axis, which is the central axis of the shank.
A plurality of transmission rods are arranged on a cylindrical surface centered on the shank axis, and are distributed evenly around the circumference.
The receiving portions may be arranged on a cylindrical surface centered on the tilt axis, and the number of the receiving portions may be the same as the number of the transmission rods, being evenly distributed around the circumference. The receiving portions may have a contact surface on a plane passing through the shank axis.
The blade may include a brush.

The present invention provides a deburring tool that is less prone to tool vibration.

FIG. 1 is a vertical cross-sectional view of a deburring tool according to a first embodiment when not processing; Cross-sectional view taken along line II-II of FIG. FIG. 1 is a vertical cross-sectional view showing a deburring tool in a state where a tilting shaft of a first embodiment is tilted; FIG. 13 is a vertical cross-sectional view of the deburring tool according to the second embodiment when not processing. FIG. 5 is an enlarged cross-sectional view of a V portion of FIG. FIG. 13 is a vertical cross-sectional view showing a deburring tool in a state where the tilting shaft is tilted according to a second embodiment; FIG. 7 is an enlarged cross-sectional view of part VI of FIG. FIG. 13 is a vertical cross-sectional view of the deburring tool according to the third embodiment when not processing. IX-IX line cross-sectional view of FIG. FIG. 13 is a vertical cross-sectional view showing a deburring tool in a state where the tilting shaft is tilted according to a second embodiment;

First Embodiment
1, the deburring tool 100 of the embodiment includes a housing 1 having a shank 11, a pair of transmission rods 3, a tilt shaft 4, a spherical bush 24, and a tilt correction mechanism 9. The deburring tool 100 may include a push rod 5, a spring 6, and a pressing head 8.
The deburring tool 100 has a shank 11 attached to a spindle (not shown) of a machine tool such as a machining center, and the entire deburring tool 100 is rotated together with the blade 101 when in use.
Hereinafter, for convenience of explanation, the direction along the shank axis 15 or the tilt axis 43 may be referred to as the up-down direction.

The housing 1 has a body 12, a mechanism chamber 13, and a seat surface 14. The housing 1 may have an adjustment screw 61. The shank 11 is, for example, a straight shank. The shank 11 extends along a shank axis 15.
The body 12 is disposed on the tip side of the shank 11. The body 12 is cylindrical and has a shank axis 15 as its center.
The mechanism chamber 13 is a stepped cylinder centered on the shank axis 15, and extends inside the shank 11 and the body 12. The mechanism chamber 13 has a small diameter portion 13a disposed at the base end and a large diameter portion 13b disposed at the tip end. A bushing 53 may be disposed in the small diameter portion 13a. The small diameter portion 13a may have an opening 13c on the base end side of the shank 11. A female thread 11a is disposed in the opening 13c. An adjustment screw 61 is screwed into the female thread 11a.
The seat 14 is disposed at the tip of the mechanism chamber 13 and has an inner surface in the shape of a right circular cone whose diameter decreases toward the tip. The seat 14 may be a concave spherical surface.

The spherical bushing 24 has a convex spherical surface 24a. The center of the spherical surface 24a is the tilt center 25. The spherical surface 24a is inscribed in the seating surface 14. The spherical bushing 24 slides on the seating surface 14.

The transmission rod 3 has a shaft portion 33 and a bulge portion 34. The transmission rod 3 is arranged inside the mechanism chamber 13 and parallel to the shank axis 15. A plurality of transmission rods 3 are arranged on the circumference of a right cylindrical surface 16 (see FIG. 2) centered on the shank axis 15. The transmission rods 3 may be arranged at equal intervals on the circumference. For example, 5 to 7 transmission rods 3 are arranged. The transmission rods 3 are fixed to the housing 1. The transmission rods 3 pass through the receiving portion 41a.
The outer surface of the bulge 34 is a convex spherical surface. The center of the bulge 34 is disposed on a plane that is perpendicular to the shank axis 15 and passes through the tilt center 25 of the tilt shaft 4. The bulge 34 is disposed in the receiving portion 41a with a small amount of play.

The push rod 5 has a stem 52. The push rod 5 may have a protrusion 56 and an abutment portion 54. The protrusion 56 is cylindrical and is disposed at the tip of the stem 52. The recess 51 is disposed on the shank shaft 15 at the tip of the protrusion 56. The abutment portion 54 is attached to the recess 51. A tip surface 54a of the abutment portion 54 is a plane perpendicular to the shank shaft 15.
The stem 52 is cylindrical and disposed within the small diameter portion 13a. The stem 52 is supported by the small diameter portion 13a or the bush 53 so as to be capable of sliding freely.
The push rod 5 has a stem 52 which is guided by the small diameter portion 13a and can reciprocate up and down.

The spring 6 is, for example, a coil spring or a disc spring. The spring 6 biases the push rod 5 toward the tip. The spring 6 is supported by the push rod 5 and an adjustment screw 61. The adjustment screw 61 adjusts the initial length of the spring 6.

The tilt shaft 4 includes a rod portion 42, a flange portion 41, and a pair of receiving portions 41a. The tilt shaft 4 extends along a tilt axis 43. The tilt axis 43 passes through the tilt center 25. The tilt shaft 4 is supported by the seat 14 via a spherical bush 24.
The rod portion 42 is cylindrical. The rod portion 42 is disposed on the tip side of the flange portion 41 and extends downward from the housing 1. The rod portion 42 holds the blade 101. The flange portion 41 is a disk centered on the tilt axis 43. The receiving portion 41a is disposed in the flange portion 41.
The receiving portion 41a is a hole that penetrates the flange portion 41 in the vertical direction. The receiving portion 41a is arranged on a plane that is perpendicular to the tilting axis 43 and passes through the tilting center 25. As shown in FIG. 2, the receiving portion 41a is evenly arranged on a right cylindrical surface 44 centered on the tilting axis 43. The right cylindrical surface 44 has the same diameter as the right cylindrical surface 16. The receiving portion 41a is arranged in the same number as the transmission rod 3. The receiving portion 41a has an abutment surface 41b. The abutment surface 41b is a wall surface of the receiving portion 41a on the side of the rotation direction of the blade 101. The abutment surface 41b constitutes a part of a plane (e.g., plane 102) including the tilting axis 43. The abutment surface 41b is arranged corresponding to the position of the transmission rod 3. For example, when the transmission rods 3 are evenly arranged on the circumference, the abutment surfaces 41b are also evenly arranged on the circumference. When viewed from the axial direction of the tilting axis 43, the receiving portion 41a is, for example, rectangular. The receiving portion 41a has a size such that, when the tilting shaft 4 tilts, the transmission rod 3 does not come into contact with any surface other than the abutting surface 41b.

The tilt shaft 4 may have a collet 75. The collet 75 is attached to the tip of the rod portion 42. The collet 75 holds the blade 101. For example, the rod portion 42 has a female thread 42a, and the collet 75 has a male thread 75a on its outer periphery. The collet 75 is screwed into the female thread 42a.

1, the pressing head 8 is bullet-shaped and has a top 81. The pressing head 8 is disposed on the base end side of the tilting shaft 4. The pressing head 8 abuts against the rotation center of the push rod 5.
The top 81 is disposed so as to protrude from the center of the base end side of the tilting shaft 4. The top 81 is hemispherical. The top 81 abuts against the abutment portion 54. The center of the top 81 is disposed on the tilting axis 43. The apex 86 of the top 81 is located in the vicinity of the tilting center 25. The apex 86 of the top 81 may coincide with the tilting center 25. In this case, the pressing head 8 contacts the push rod 5 at the tilting center 25.

The tilt correction mechanism 9 includes a plurality of spring guides 91 and a plurality of coil springs 92. The spring guides 91 are arranged near the outer periphery inside the mechanism chamber 13, evenly spaced on a circumference and extending parallel to the shank axis 15. The spring guides 91 are cylindrical. When the tilt shaft 4 is tilted, the spring guides 91 are configured not to interfere with the tilt shaft 4. For example, the spring guides 91 are arranged on the outer periphery side of the transmission rod 3. The spring guides 91 may be arranged in the middle of the transmission rod 3 on the circumference on which the transmission rod 3 is arranged.

The coil springs 92 are compression coil springs and are inserted into the respective spring guides 91. The coil springs 92 are disposed between the upper surface 13d, which is the surface of the inner surface of the mechanism chamber 13 facing the shank 11, and the flange portion 41.

The operation of the deburring tool 100 of this embodiment will be described.
The shank 11 is attached to a spindle (not shown) of a machine tool. The housing 1 rotates together with the spindle. The rotation of the housing 1 is transmitted to the tilt shaft 4 via the transmission rod 3. The blade 101 and the tilt shaft 4 rotate together.

As shown in FIG. 1, the elastic force of the spring 6 causes the push rod 5 to bias the tilt shaft 4 toward the tip via the pressing head 8.

The machine tool rotates and moves the deburring tool 100. The blade 101 comes into contact with the workpiece 103 (see Figure 3).

As the spindle moves, the cutting tool 101 cuts the workpiece 103 while moving along the ridge of the workpiece 103. The spherical bush 24 slides against the seat surface 14 to maintain a supported state, and the tilting shaft 4 can tilt around the tilting center 25 (see Figure 3).

When the tilting shaft 4 tilts along the shape of the workpiece 103, the lengths 92a (see FIG. 1) of the coil springs 92 arranged around the flange portion 41 change according to the distance between the flange portion 41 and the upper surface 13d at each position. The elastic force of the coil springs 92 with a short length 92a is large, and the elastic force of the coil springs with a long length 92a is small. Due to the difference in the elastic force that each coil spring 92 exerts on the outer periphery of the flange portion 41, the tilting axis 43 of the tilting shaft 4 tries to rotate so as to coincide with the shank axis 15.
According to this embodiment, it is possible to provide a deburring tool 100 and a deburring method in which the tool is less likely to vibrate.

Second Embodiment
As shown in Fig. 4, the deburring tool 200 of this embodiment has an inclination correction mechanism 209. Other configurations of the deburring tool 200 are the same as those of the deburring tool 100. The inclination correction mechanism 209 has a conical surface 291 and a pressing head 292. The conical surface 291 is disposed with its apex facing upward and centered on the shank axis 15. The conical surface 291 is formed on the tip (lower end) of the push rod 5. The angle between the generatrix of the conical surface 291 and the shank axis 15 is, for example, 60 degrees to 80 degrees.

The pressing head 292 is disposed at the upper end (base end) of the tilting shaft 4. As shown in FIG. 5, the pressing head 292 has a straight cylindrical portion 293 and a hemispherical portion 294. The straight cylindrical portion 293 is disposed about the tilting axis 43 (see FIG. 4). The hemispherical portion 294 contacts the conical surface 291. The diameter of the hemispherical portion 294 is the same as the diameter of the straight cylindrical portion 293. The center 295 of the hemispherical portion 294 is located above the tilting center 25 (toward the shank 11).

The deburring tool 200 rotates and comes into contact with the workpiece 103. As shown in FIG. 6, when the tilting shaft 4 tilts, the top of the pressing head 292 comes into contact with the conical surface 291, moving toward one side of the conical surface 291. As shown in FIG. 7, at this time, a component force F of the elastic force of the spring 6 in a direction perpendicular to the conical surface 291 is applied to the pressing head 292 from a contact point 296 between the conical surface 291 and the pressing head 292. Because the component force F is applied to the pressing head 292 from the contact point 296, a moment load is applied to the tilting shaft 4, which tries to return the tilt of the tilting axis 43 to its original position in the direction of arrow M in FIG. 7.

Third Embodiment
8 , the deburring tool 300 of this embodiment has an inclination correction mechanism 309. Other configurations of the deburring tool 300 are the same as those of the deburring tool 100. The inclination correction mechanism 309 has a first rolling groove 391, a second rolling groove 392, and balls 393.

The first rolling groove 391 is disposed on the lower surface 41c, which is the surface of the flange portion 41 facing the blade 101, so as to face the second rolling groove 392. The first rolling groove 391 has a semicircular cross section and extends in the radial direction. Here, the cross section is a cross section perpendicular to the radial direction in which the first rolling groove 391 extends. As shown in FIG. 9, the first rolling groove 391 is disposed midway between each of the receiving portions 41a when viewed from above. The depth of the first rolling groove 391 is constant here.

The second rolling groove 392 is disposed on the floor surface 13e, which is the surface of the inner surface of the mechanism room 13 facing the blade 101. The second rolling groove 392 has a V-shaped cross section and extends in the radial direction. Here, the cross section is a cross section perpendicular to the radial direction in which the second rolling groove 392 extends. As shown in FIG. 8, the depth of the second rolling groove 392 is deepest in the center and becomes shallower toward the radial inward and radially outward.

In this way, the distance in the shank axis 15 direction between the bottom surface of the first rolling groove 391 and the bottom surface of the second rolling groove 392 becomes smaller from the radial center toward the radial outside. The ball 393 is inserted between the first rolling groove 391 and the second rolling groove 392, and rolls between the first rolling groove 391 and the second rolling groove 392.

The deburring tool 300 rotates and comes into contact with the workpiece 103. As shown in FIG. 10, when the tilting shaft 4 tilts, the ball 393 rolls along the gap between the first rolling groove 391 and the second rolling groove 392. A centrifugal force acts on the ball 393, causing it to roll radially outward between the first rolling groove 391 and the second rolling groove 392. The centrifugal force acting on the ball 393 acts on the tilting shaft 4 as a moment load that attempts to restore the tilt of the flange portion 41.

The present invention is not limited to the above-described embodiment, and various modifications are possible without departing from the gist of the present invention. All technical matters included in the technical ideas described in the claims are the subject of the present invention. The above-described embodiment shows a preferred example, but a person skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents disclosed in this specification, and these are included in the technical scope described in the attached claims.

1 Housing 11 Shank 13 Mechanism chamber 13d Top surface (surface)
13e Floor surface (surface)
14 seat surface 15 shank axis 24 spherical bush 25 tilt center 3 transmission rod 34 bulge portion 4 tilt shaft 41 flange portion 41a receiving portion 41b abutment surface 41c lower surface 42 rod portion 43 tilt axis 5 push rod 6 spring (elastic member)
61 Adjustment screw 8 Press head 9, 209, 309 Tilt correction mechanism 91 Spring guide 92 Coil spring 291 Conical surface 292 Press head 294 Hemispherical portion 295 Center 391 First rolling groove 392 Second rolling groove 393 Ball 100, 200, 300 Deburring tool 101 Blade

Claims (5)

a housing having a shank and a mechanism chamber disposed along a shank axis;
A plurality of transmission rods are arranged around the shank axis in parallel with the shank axis and fixed to the mechanism chamber;
A tilt shaft,
Flange part,
a receiving portion having an abutment surface, the receiving portion being disposed on the flange portion and through which the transmission rod passes; and
A rod portion is disposed on a tip side of the flange portion and holds a blade,
A tilt shaft is disposed along a tilt axis passing through a tilt center on the shank axis and can tilt around the tilt center;
Equipped with
The transmission rod is disposed on a plane perpendicular to the shank axis and passing through the tilt center, and has a bulge portion in contact with the abutment surface.
Deburring tool. a tilt correction mechanism that, when the tilt shaft is tilted from the shank axis, rotates the tilt shaft in a direction opposite to the tilt direction along the shank axis,
The housing has a seat surface,
The tilt shaft is supported by the seat surface and has a spherical bush having a tilt center on the shank axis.
The deburring tool of claim 1. The transmission rods are arranged on a cylindrical surface centered on the shank axis and are distributed evenly around the circumference.
The deburring tool according to claim 1 or 2. The receiving portions are disposed on a cylindrical surface centered on the tilt axis so as to be uniformly distributed around the circumference and in the same number as the transmission rods.
The deburring tool according to any one of claims 1 to 3. The receiving portion has the abutment surface on a plane passing through the shank axis.
The deburring tool according to any one of claims 1 to 4.

Images