JP2023178392A - deburring tool - Google Patents

Abstract

To provide a deburring tool which does not vibrate easily.SOLUTION: A deburring tool 100 includes: a housing 1 having a shank 11 disposed along a shank axis 15, a transmission rod 3, and a tilting shaft 4. The tilting shaft 4 has a flange part 41, a reception part 41a through which the transmission rod 3 penetrates, and a rod part 42 configured to hold a blade 101 and tilts around a tilting center. The transmission rod 3 has an expansion part 34 which is disposed on a plane, which is perpendicular to the shank axis 15 and passes through the tilting center, and comes into contact with a contact surface 41b of the reception part 41a.SELECTED DRAWING: Figure 1

Description

The present invention relates to a deburring tool.

A shank attached to the main shaft of a machine tool, a tool holding member that rotates together with the shank, and a tilting bias that supports the tool holding member so as to be tiltable about the shank axis and urges the tool holding member against the shank. A deburring tool has been proposed that includes a support member having means (Patent Document 1).

JP2009-214234A

When deburring using the deburring tool of Patent Document 1, the tool sometimes vibrates. The present invention provides a deburring tool that is less likely to vibrate.

The first aspect of the present invention is
a housing having a shank and a mechanism chamber arranged along the shank axis;
a plurality of transmission rods arranged around the shank axis in parallel to the shank axis and fixed to the mechanism chamber;
a tilting shaft,
flange part,
a receiving portion having an abutment surface, disposed on the flange portion and through which the transmission rods respectively pass;
a rod portion disposed on the tip side of the flange portion and holding a cutter;
a tilting shaft disposed along a tilting axis passing through the tilting center on the shank shaft and capable of tilting about the tilting center;
including;
The transmission rod is arranged on a plane that is perpendicular to the shank axis and passes through the tilting center, and has a bulge that contacts the abutment surface.
It is a deburring tool.

The tilting shaft may further include a tilt correction mechanism that rotates the tilting shaft in a direction opposite to the tilting direction along the shank axis when the tilting shaft is tilted from the shank axis.
The housing may have a seating surface, and the tilting shaft may include a spherical bushing supported by the seating surface and having a tilting center on the shank axis.

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

The tilt correction mechanism is
a plurality of spring guides arranged circumferentially and parallel to the shank axis on the outer peripheral side of the interior of the mechanism chamber;
The device may include a plurality of coil springs arranged between the shank-side surface of the inner surface of the mechanism chamber and the flange portion and inserted into the plurality of spring guides, respectively.

The tilt correction mechanism is
a push rod that can reciprocate along the shank axis;
an elastic member that urges the push rod toward the tilting shaft;
a conical surface provided at the tip of the push rod;
a pressing head disposed at a proximal 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 center of tilting.

The tilt correction mechanism is
a push rod that can reciprocate along the shank axis;
a pressing head disposed at the base end of the tilting shaft and in contact with a rotational center of the push rod;
an elastic member that urges the push rod toward the tilting shaft;
a first rolling groove disposed on a surface of the flange portion on the blade side and extending in the radial direction;
a second rolling groove extending in the radial direction and arranged on the cutter side surface of the inner surface of the mechanism chamber;
a ball inserted between the first rolling groove and the second rolling groove,
The distance in the shank axial direction between the bottom surface of the first rolling groove and the bottom surface of the second rolling groove may become smaller from the radially central portion toward the radially outer side.

The push rod may be guided by the housing to move in the axial direction of the shank.
The push rod, spherical bushing, seat surface, pressing head, and cutter are arranged on the 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 equally distributed on the circumference.
The receiving portions may be arranged in the same number as the transmission rods on a cylindrical surface centered on the tilting axis, and equally distributed on the circumference. The receiving portion may have an abutment surface on a plane passing through the shank axis.
Note that the cutlery may include a brush.

According to the present invention, it is possible to provide a deburring tool in which the tool is less likely to vibrate.

Vertical cross-sectional view of the deburring tool in the non-processing state of the first embodiment Cross-sectional view taken along line II-II in Figure 1 A vertical cross-sectional view showing the deburring tool in a state where the tilting shaft of the first embodiment is tilted. Vertical cross-sectional view of the deburring tool in the non-processing state of the second embodiment Enlarged sectional view of V section in Figure 4 A vertical sectional view showing a deburring tool in a state where the tilting shaft of the second embodiment is tilted. Enlarged sectional view of VI section in Figure 6 Vertical cross-sectional view of the deburring tool in the non-processing state of the third embodiment Cross-sectional view taken along line IX-IX in Figure 8 A vertical sectional view showing a deburring tool in a state where the tilting shaft of the second embodiment is tilted.

(First embodiment)
As shown in FIG. 1, the deburring tool 100 of the embodiment includes a housing 1 with a shank 11, a set of transmission rods 3, a tilting 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 shank 11 of the deburring tool 100 is attached to a main shaft (not shown) of a machine tool such as a machining center, and the entire deburring tool 100 rotates together with a cutter 101 when used.
Hereinafter, for convenience of explanation, the direction along the shank shaft 15 or the tilting shaft 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 arranged on the distal end side of the shank 11. The body 12 has a cylindrical shape centered on the shank shaft 15.
The mechanism chamber 13 is a stepped cylinder centered on the shank shaft 15, and extends inside the shank 11 and the body 12. The mechanism chamber 13 has a small diameter part 13a located at the base end and a large diameter part 13b located at the distal end. A bush 53 may be arranged in the small diameter portion 13a. The small diameter portion 13a may have an opening 13c on the proximal end side of the shank 11. A female thread 11a is arranged in the opening 13c. The adjustment screw 61 is screwed into the female thread 11a.
The seat surface 14 is disposed at the tip of the mechanism chamber 13, and is a right circular conical inner surface whose diameter decreases toward the tip. Note that the seat surface 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 tilting center 25. The spherical surface 24a is inscribed in the seat surface 14. The spherical bush 24 slides on the seat 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 shaft 15. The transmission rods 3 may be arranged at equal intervals on the circumference. For example, five to seven transmission rods 3 are arranged. The transmission rod 3 is fixed to the housing 1. The transmission rod 3 passes through the receiving portion 41a.
The outer surface of the bulge 34 is a convex spherical surface. The center of the bulge 34 is arranged on a plane that is perpendicular to the shank axis 15 and passes through the tilting center 25 of the tilting shaft 4 . The bulging portion 34 is placed in the receiving portion 41a with some play.

Push rod 5 has a stem 52. The push rod 5 may have a convex portion 56 and a contact portion 54. The protrusion 56 has a cylindrical shape and is arranged at the tip of the stem 52. The recess 51 is arranged on the shank shaft 15 at the tip of the protrusion 56 . The contact portion 54 is attached to the recess 51 . A distal end surface 54a of the contact portion 54 is a plane perpendicular to the shank axis 15.
The stem 52 has a cylindrical shape and is disposed within the small diameter portion 13a. The stem 52 is slidably supported by the small diameter portion 13a or the bush 53.
The push rod 5 can reciprocate in the vertical direction with the stem 52 being guided by the small diameter portion 13a.

The spring 6 is, for example, a coil spring or a disc spring. The spring 6 biases the push rod 5 in the distal direction. Spring 6 is supported by push rod 5 and adjustment screw 61. Adjustment screw 61 adjusts the initial length of spring 6.

The tilting shaft 4 includes a rod portion 42, a flange portion 41, and a set of receiving portions 41a. The tilting shaft 4 extends along a tilting axis 43. The tilting axis 43 passes through the tilting center 25. The tilting shaft 4 is supported by the seat surface 14 via a spherical bush 24.
The rod portion 42 has a cylindrical shape. The rod portion 42 is disposed on the distal end side of the flange portion 41 and extends below the housing 1. The rod portion 42 holds the cutter 101. The flange portion 41 is a circular plate centered on the tilting shaft 43. The receiving portion 41a is arranged on the flange portion 41.
The receiving portion 41a is a hole that passes through the flange portion 41 in the vertical direction. The receiving portion 41 a is arranged on a plane that is perpendicular to the tilting axis 43 and passing through the tilting center 25 . As shown in FIG. 2, the receiving portions 41a are evenly arranged on a right cylindrical surface 44 centered on the tilting shaft 43. As shown in FIG. The right cylindrical surface 44 has the same diameter as the right cylindrical surface 16. The receiving portions 41a are arranged in the same number as the transmission rods 3. The receiving portion 41a has a contact surface 41b. The contact surface 41b is a wall surface of the receiving portion 41a on the rotational direction side of the cutter 101. The contact surface 41b constitutes a part of a plane (for example, the plane 102) that includes the tilting axis 43. The contact surface 41b is arranged corresponding to the position of the transmission rod 3. For example, when the transmission rods 3 are arranged evenly on the circumference, the contact surfaces 41b are also arranged evenly on the circumference. When viewed from the axial direction of the tilting shaft 43, the receiving portion 41a has a rectangular shape, for example. When the tilting shaft 4 tilts, the receiving portion 41a has a size such that the transmission rod 3 does not come into contact with anything other than the contact surface 41b.

The tilting shaft 4 may have a collet 75. The collet 75 is attached to the tip of the rod portion 42 . Collet 75 holds 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 to the female thread 42a.

As shown in FIG. 1, the pressing head 8 is bullet-shaped and has a top portion 81. As shown in FIG. The pressing head 8 is arranged on the proximal end side of the tilting shaft 4 . The pressing head 8 comes into contact with the rotational center of the push rod 5 .
The top portion 81 is disposed so as to protrude from the central portion of the base end side of the tilting shaft 4 . The top portion 81 is hemispherical. The top portion 81 contacts the contact portion 54 . The center of the top portion 81 is located on the tilting axis 43. An apex 86 of the top portion 81 is located near the center of tilting 25 . The apex 86 of the top portion 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 so as to extend evenly on the circumference and parallel to the shank shaft 15 . The spring guide 91 is a cylinder. The spring guide 91 is configured not to interfere with the tilting shaft 4 when the tilting shaft 4 is tilted. For example, the spring guide 91 is arranged on the outer peripheral side of the transmission rod 3. The spring guide 91 may be arranged in the middle of the transmission rod 3 on the circumference around 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 spring 92 is arranged between the upper surface 13d, which is the surface on the shank 11 side of the inner surface of the mechanism chamber 13, and the flange portion 41.

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

As shown in FIG. 1, the push rod 5 urges the tilting shaft 4 in the distal direction via the pressing head 8 due to the elastic force of the spring 6.

The machine tool moves the deburring tool 100 while rotating it. The cutter 101 comes into contact with the workpiece 103 (see FIG. 3).

As the main shaft moves, the cutter 101 cuts the workpiece 103 while moving along the ridgeline of the workpiece 103. The spherical bush 24 slides on the seat surface 14 and remains supported, and the tilting shaft 4 can tilt around the tilting center 25 (see FIG. 3).

When the tilting shaft 4 tilts along the shape of the workpiece 103, the length 92a (see FIG. 1) of the coil spring 92 disposed around the flange portion 41 changes between the flange portion 41 and the upper surface 13d at each position. varies depending on the distance. The elastic force of the coil spring 92 with a short length 92a becomes large, and the elastic force of a coil spring 92 with a long length 92a becomes small. Due to the difference in the elastic force that each coil spring 92 applies to the outer circumference of the flange portion 41, the tilting shaft 43 of the tilting shaft 4 tends to rotate so as to coincide with the shank shaft 15.
According to this embodiment, it is possible to provide a deburring tool 100 and a deburring method in which the tool does not easily vibrate.

(Second embodiment)
As shown in FIG. 4, the deburring tool 200 of this embodiment has an inclination correction mechanism 209. The other configurations of the deburring tool 200 are the same as the deburring tool 100. The tilt correction mechanism 209 has a conical surface 291 and a pressing head 292. The conical surface 291 is arranged around the shank axis 15 with the apex facing upward. The conical surface 291 is formed at 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 arranged at the upper end (base end) of the tilting shaft 4. As shown in FIG. 5, the pressing head 292 has a right cylindrical portion 293 and a hemispherical portion 294. The right cylindrical portion 293 is arranged around 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 right cylindrical portion 293. A center 295 of the hemispherical portion 294 is located above the tilting center 25 (on the shank 11 side).

The deburring tool 200 rotates and comes into contact with the workpiece 103. As shown in FIG. 6, when the tilting shaft 4 is tilted, the top of the pressing head 292 approaches one side of the conical surface 291 and comes into contact with 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. Since 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 to return the tilting shaft 43 to its original direction in the direction of the arrow M in FIG.

(Third embodiment)
As shown in FIG. 8, the deburring tool 300 of this embodiment has an inclination correction mechanism 309. The other configurations of the deburring tool 300 are the same as the deburring tool 100. The tilt correction mechanism 309 includes a first rolling groove 391, a second rolling groove 392, and a ball 393.

The first rolling groove 391 is arranged on the lower surface 41c, which is the surface of the flange portion 41 on the blade 101 side, 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 arranged between the respective receiving portions 41a when viewed from above. The depth of the first rolling groove 391 is constant here.

The second rolling groove 392 is arranged on the floor surface 13e, which is the surface on the blade 101 side of the inner surface of the mechanism chamber 13. 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 at the center and becomes shallower toward the inner side and the outer side in the radial direction.

In this way, the distance between the bottom surface of the first rolling groove 391 and the bottom surface of the second rolling groove 392 in the shank axis 15 direction becomes smaller from the radially central portion toward the radially outer side. 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 contacts the workpiece 103. As shown in FIG. 10, when the tilting shaft 4 is tilted, the balls 393 roll along the gap between the first rolling groove 391 and the second rolling groove 392. A centrifugal force acts on the ball 393, and the ball 393 tries to roll radially outward between the first rolling groove 391 and the second rolling groove 392. The centrifugal force applied to the ball 393 acts on the tilting shaft 4 as a moment load that attempts to restore the inclination of the flange portion 41.

It should be noted that the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the gist of the present invention, and all technical matters included in the technical idea described in the claims are included. This is the object of the present invention. Although the embodiments described above are preferred examples, those skilled in the art can realize various alternatives, modifications, variations, or improvements based on the contents disclosed in this specification. These are within the scope of the appended claims.

1 Housing 11 Shank 13 Mechanism chamber 13d Top surface (surface)
13e Floor surface (surface)
14 Seat surface 15 Shank shaft 24 Spherical bush 25 Tilting center 3 Transmission rod 34 Swelling portion 4 Tilting shaft 41 Flange portion 41a Receiving portion 41b Contact surface 41c Lower surface 42 Rod portion 43 Tilting shaft 5 Push rod 6 Spring (elastic member)
61 Adjustment screw 8 Pressing head 9,209,309 Tilt correction mechanism 91 Spring guide 92 Coil spring 291 Conical surface 292 Pressing head 294 Hemisphere 295 Center 391 First rolling groove 392 Second rolling groove 393 Ball 100,200,300 Deburring tools 101 Cutlery

Claims (5)

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

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