JP3226021U - Chamfer Cutter and Chamfering Equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chamfering cutter for performing chamfering processing with good sharpness on both opening edges of a through hole, and a chamfering apparatus capable of performing such chamfering processing. A chamfering cutter (1) has a cutting portion (4) provided on a tip side of a shank (2) and has an escape groove (5) extending obliquely with respect to an axial direction. The first chamfer cutting edge 6 and the second chamfer cutting edge 7 are formed separately. The chamfering device includes a chuck mechanism that holds the chamfering cutter, a rotating mechanism that rotates the chamfering cutter around an axis, and the rotating mechanism rotates the chamfering cutter in one direction to generate a first chamfering cutting blade. The opening edge of the through hole 19 on the inlet side is chamfered by 6, and the chamfering cutter is rotated in the opposite direction, whereby the second chamfer cutting blade 7 chamfers the opening edge of the through hole on the outlet side. [Selection diagram] Fig. 5

Description

  The present invention relates to a chamfering cutter for chamfering an opening edge of a through hole formed in an object to be cut, and a chamfering device using such a chamfering cutter.

  When chamfering the opening edges on both the front and back sides of the through hole drilled in the workpiece, after the through hole is drilled in the workpiece fixed on the mounting table, the chamfering blade provided on the rotary cutting tool Is chamfered by abutting against the peripheral edge of one side of the through hole, and then the object to be cut is inverted and fixed again on the mounting table, and the chamfering blade of the rotary cutting tool is attached to the other side of the through hole. A method is known in which a chamfering process is performed by bringing the chamfering process into contact with the peripheral edge of.

  However, when chamfering both ends of the through hole by reversing the object to be cut in this way, it is necessary to remove the object once from the mounting table, turn it over, and then fix it again on the mounting table. However, there is a problem that a large amount of work time is required for the removing work and the reversing work particularly when the weight of the object to be cut becomes large. Therefore, conventionally, there has been proposed a chamfering drill capable of chamfering the opening edges of both the front and back sides of the through hole while fixing the workpiece on the mounting table without inverting it (see Patent Document 1). .

  The chamfering drill disclosed in Patent Document 1 has a first chamfering cutting edge having a smaller diameter from the cutting blade side toward the shank side on the tip side of the main end portion interposed between the shank and the cutting blade, and The first chamfering cutting edge and the second chamfering cutting edge are configured to have a second chamfering cutting edge that has a larger diameter from the cutting blade side toward the shank side at a position distant from the one chamfering cutting edge to the shank side. Are formed on the peripheral edge of a relief groove that is recessed parallel to the axis of the drill.

  When chamfering the through hole of the work piece using the drill configured in this way, attach the shank of the drill to the rotation drive part of the processing device and place the work piece on the mounting table and fix it. After that, first, the through hole is formed in the object to be cut by the cutting blade provided on the tip side of the drill by advancing toward the object to be cut while rotating the drill. Next, the drill is further advanced to bring the first chamfering cutting edge into contact with the opening edge on the lower side (outlet side) of the through hole, and in this state, rotate the drill to chamfer the lower opening edge of the through hole. I do. After that, the drill is further advanced to bring the second chamfering cutting edge into contact with the opening edge on the upper side (inlet side) of the through hole, and in this state, the drill is rotated to chamfer the upper opening edge of the through hole. . After that, the chamfering process is completed by retracting the drill and extracting it from the through hole.

JP 2005-22003 A

  According to the chamfering drill described in Patent Document 1, the first chamfering cutting edge and the second chamfering cutting edge are formed at two positions along the axial direction of the chamfering drill, so that the object to be cut is purposely inverted. Even without the chamfering, chamfering can be performed on both opening edges of the through hole. However, since the first chamfering cutting edge and the second chamfering cutting edge are formed in the peripheral portion of the clearance groove extending parallel to the axis of the drill, a sharp cutting edge cannot be realized and the chamfering with a good sharpness is achieved. There was a problem that processing could not be performed.

  The present invention has been made in view of the above-mentioned circumstances of the prior art, and a first object thereof is to provide a chamfering cutter capable of sharply chamfering both opening edges of a through hole. Therefore, a second object is to provide a chamfering apparatus capable of performing such chamfering.

  In order to solve the first object, a chamfering cutter according to the present invention comprises a shank that extends in an axial direction and is connected to a rotary drive unit, and a cutting unit provided on a tip side of the shank. The cutting portion has a relief groove extending obliquely with respect to the axial direction of the shank, and a first chamfering cutting edge is formed at a tip side position in one peripheral edge portion of the relief groove, and A second chamfering cutting edge is formed at a rear end side position in the other peripheral edge portion of the clearance groove.

  In the chamfering cutter configured as described above, the cutting portion provided on the tip side of the shank has escape grooves extending obliquely with respect to the axial direction, and the first groove is provided on both opposing peripheral edge portions of the escape groove. Since the chamfering cutting edge and the second chamfering cutting edge are separately formed, both the first chamfering cutting edge and the second chamfering cutting edge can be sharply formed. As a result, the first chamfering cutting edge can sharply chamfer the opening edge on the inlet side (front side) of the through hole, and also the opening edge on the outlet side (back side) of the through hole. The second chamfering cutting edge enables chamfering with good sharpness.

  In the chamfering cutter having the above structure, the neck portion is provided between the shank and the cutting portion, and the first chamfering cutting edge extends from the tip of the cutting portion toward the central portion so as to have a large diameter. At the same time, when the second chamfering cutting edge extends from the central portion of the cutting portion toward the tip side of the neck portion so as to have a small diameter, an escape groove extending obliquely from the tip of the cutting portion to the neck portion. By providing the concave portion, it is possible to easily form the sharp first and second chamfering cutting edges.

  Further, in the chamfering cutter having the above configuration, the number of relief grooves is not particularly limited, but a plurality (for example, three) of relief grooves are provided at different positions along the circumferential direction of the cutting portion, and these relief grooves have It is preferable that each of the first chamfering cutting edge and the second chamfering cutting edge is formed.

  In order to solve the second object, a chamfering apparatus according to the present invention comprises a chuck mechanism that holds the chamfering cutter having the above-described configuration, and a rotation mechanism that rotates the chamfering cutter held by the chuck mechanism around an axis. And a moving mechanism capable of relatively moving the chamfering cutter held by the chuck mechanism in the axial direction and the radial direction, wherein the rotating mechanism is an inlet of a through hole formed in a workpiece. When chamfering the opening edge on the side with the first chamfer cutting blade, the chamfering cutter is rotated in either one of the forward and reverse directions, and the opening edge on the outlet side of the through hole is cut by the second chamfering edge. When chamfering with a blade, the chamfering cutter is rotated in either the forward or reverse direction.

  As described above, in the chamfering device using the chamfering cutter according to the present invention, the tip end side of the chamfering cutter is adjusted while adjusting the relative position between the object to be cut having the through hole and the chamfering cutter held by the chuck mechanism. The first chamfering cutting edge formed on the abutment is brought into contact with the opening edge of the through hole on the inlet side, and in this state, the chamfering cutter is rotated in one direction around the axis (for example, in the normal rotation direction), thereby The opening edge on the inlet side can be chamfered. Further, the cutting portion of the chamfering cutter is inserted from the entrance side of the through hole, and the second chamfering cutting edge formed at a position facing the first chamfering cutting edge through the clearance groove is opened on the exit side of the through hole. The chamfering cutter is brought into contact with the edge, and in this state, the chamfering cutter is rotated in the other direction (reverse direction) about the axis, whereby the opening edge on the outlet side of the through hole can be chamfered.

  According to the chamfering cutter of the present invention, it is possible to perform sharp chamfering processing on both opening edges of the through hole.

  Further, according to the chamfering device of the present invention, when the chamfering process is performed on the opening edge on the inlet side and the outlet side of the through hole, the rotation direction of the chamfering cutter is reversed so that Chamfering with good sharpness can be performed.

It is a side view of the chamfering cutter concerning the embodiment of the present invention. FIG. 2 is a view on arrow A in FIG. 1. It is the side view which looked at the chamfering cutter shown in FIG. 1 from another direction. It is explanatory drawing of the chamfering apparatus which concerns on embodiment of this invention. It is explanatory drawing which shows the chamfering process process of a through hole.

  DETAILED DESCRIPTION OF THE INVENTION Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a chamfering cutter according to the embodiment of the present invention, FIG. It is the side view which looked at the chamfering cutter shown in FIG. 2 from another direction.

  The chamfering cutter 1 according to the present embodiment is made of a cemented carbide such as a WC-Co alloy or a high-speed steel, and, as shown in FIGS. 1 to 3, a cylindrical shank extending in the axial direction. 2, a neck portion 3 extending from the shank 2 to the tip side, and a cutting portion 4 provided on the tip side of the neck portion 3.

  The shank 2 is a portion that is held by a chuck mechanism of a chamfering device, which will be described later, and has the largest diameter in the chamfering cutter 1. The neck portion 3 is a portion interposed between the shank 2 and the cutting portion 4, and has the smallest diameter in the chamfering cutter 1.

  The cutting portion 4 is a portion for chamfering a through hole of a workpiece to be described later, and has a plurality of (three in the present embodiment) relief grooves 5 at positions spaced in the circumferential direction. These relief grooves 5 are formed so as to extend obliquely with respect to the axial direction of the shank 2, and a first chamfering cutting edge 6 is formed at the tip side position in one peripheral edge of each relief groove 5, and the other The second chamfering cutting edge 7 is formed at the rear end side position in the peripheral edge portion. The first chamfering cutting edge 6 and the second chamfering cutting edge 7 have opposite cutting directions, and in the case of the present embodiment, the first chamfering cutting edge 6 is for counterclockwise rotation. The second cutting edge 7 and the second chamfering cutting edge 7 are right-handed (clockwise) cutting edges.

  Explaining the grooving of the clearance groove 5 having the first chamfering cutting edge 6 and the second chamfering cutting edge 7 as described above, first, a rotating grindstone (not shown) is formed at a predetermined angle with respect to the axis of the chamfering cutter 1. After tilting (for example, 25 °) into the cutting portion 4 once, the swing angle (approach angle) of the grindstone with respect to the groove formed the first time is changed, and the grindstone is again inserted into the cutting portion 4. As a result, the bottom surface of the escape groove 5 becomes a discontinuous surface, the first chamfering cutting edge 6 is formed on the tip side of the cutting section 4, and the second chamfering cutting edge 7 is formed on the rear end side of the cutting section 4. Is formed. At that time, the first chamfering cutting edge 6 and the second chamfering cutting edge 7 are not formed on the peripheral edge portion on the same side of the escape groove 5, but are distributed to two opposing peripheral edge portions of the escape groove 5. Since it is formed, not only the first chamfer cutting edge 6 but also the second chamfer cutting edge 7 can have a large helix angle.

  Next, a process for chamfering both ends of the through hole using the chamfering cutter 1 configured as described above will be described with reference to FIGS. 4 and 5. FIG. 4 is an explanatory diagram of a chamfering apparatus according to an embodiment of the present invention, and FIG. 5 is an explanatory diagram showing a chamfering step of a through hole.

  As shown in FIG. 4, the chamfering apparatus 10 according to the present embodiment includes a chuck mechanism 11 for holding the chamfering cutter 1, a rotating mechanism 12 for rotating the chamfering cutter 1 held by the chuck mechanism 11 around an axis, The Z-direction moving mechanism 13 for moving the rotating mechanism 12 in the axial direction, the XY direction moving mechanism 14 for moving the rotating mechanism 12 in the radial direction, and the mounting table 16 on which the object to be cut 15 is mounted are horizontally arranged. An XY table 17 to be moved, a Z direction moving mechanism 13, an XY direction moving mechanism 14, and a control unit 18 for controlling the XY table 17 are provided. The Z-direction moving mechanism 13, the XY-direction moving mechanism 14, and the XY table 17 constitute a moving mechanism that relatively moves the chamfering cutter 1 held by the chuck mechanism 11 in the axial direction and the radial direction. The control unit 18 controls not only the moving mechanism but also the rotating direction of the rotating mechanism 12.

  When chamfering a through hole by the chamfering device 10 having the above-described structure, as a pre-step, a drill for drilling a hole (not shown) is attached to the chuck mechanism 11, and the through hole 19 is formed in the workpiece 15 using this drill. Have been drilled. The diameter of the through hole 19 is set to be larger than the maximum diameter of the cutting portion 4 of the chamfering cutter 1. Next, after exchanging the drill and holding the shank 2 of the chamfering cutter 1 in the chuck mechanism 11, the chamfering of the through hole 19 is performed using the chamfering cutter 1 as described below.

  That is, first, the control unit 18 controls the rotating mechanism 12 and the moving mechanism (the Z-direction moving mechanism 13, the XY-direction moving mechanism 14, and the XY table 17) to rotate the rotation center of the rotating mechanism 12 (of the chamfering cutter 1). With the axis) being moved from the center of the through hole 19 to the eccentric position, the chamfering cutter 1 is lowered (advanced) along the axial direction while rotating the rotating mechanism 12 about the axis. At this time, the rotation direction of the rotating mechanism 12 is controlled by the control unit 18 so that the chamfering cutter 1 rotates counterclockwise (counterclockwise).

  When the first chamfering cutting edge 6 formed on the tip side of the cutting portion 4 of the chamfering cutter 1 reaches the upper end portion of the through hole 19 in this manner, as shown in FIG. The cutting edge 6 chamfers the opening edge 19a of the through hole 19 on the inlet side (front side).

  Next, after the rotating mechanism 12 is moved in the horizontal direction so that the axis of the chamfering cutter 1 and the center of the through hole 19 coincide with each other, the rotating mechanism 12 is further advanced in this state to move the cutting portion 4 into the through hole 19. Move to the bottom. At this time, since the hole diameter of the through hole 19 is set to be larger than the maximum diameter of the cutting portion 4, the cutting portion 4 can be lowered without coming into contact with the inner peripheral surface of the through hole 19. Then, when the second chamfering cutting edge 7 formed on the rear end side of the cutting portion 4 reaches the opening edge 19b on the outlet side (back side) of the through hole 19, the rotation direction of the rotating mechanism 12 is switched to change the chamfering cutter. While rotating 1 clockwise (clockwise), the rotating mechanism 12 is again moved horizontally to move the axis of the chamfering cutter 1 from the center of the through hole 19 to the eccentric position, as shown in FIG. 5 (b). The chamfering process is performed on the opening-side opening edge 19b of the through hole 19 by the second chamfering cutting blade 7.

  Thereafter, the rotation of the rotating mechanism 12 is stopped, and the rotating mechanism 12 is moved in the horizontal direction so that the axis of the chamfering cutter 1 and the center of the through hole 19 coincide with each other. By ascending (retracting) and pulling out the cutting portion 4 from the through hole 19, the chamfering process for both the opening edges 19a and 19b of the through hole 19 is completed.

  In the chamfering process described above, by combining the movement in one direction (for example, the X direction) by the XY direction moving mechanism 14 and the movement in the other direction (for example, the Y direction) by the XY table 17, Although the relative position of the chamfering cutter 1 and the workpiece 15 in the radial direction (horizontal direction) is adjusted, either one of the XY direction moving mechanism 14 and the XY table 17 is omitted, Alternatively, the chamfering cutter 1 on the other side may be relatively moved in the radial direction.

  As described above, in the chamfering cutter 1 according to this embodiment, the cutting portion 4 provided on the tip side of the shank 2 has the escape groove 5 extending obliquely with respect to the axial direction. Since the first chamfering cutting edge 6 and the second chamfering cutting edge 7 are distributed and formed on both opposite peripheral edges of the both, both the first chamfering cutting edge 6 and the second chamfering cutting edge 7 are formed. It can be sharply formed. As a result, the first chamfering cutting edge 6 can sharply chamfer the opening edge 19a on the inlet side (front side) of the through hole 19 formed in the workpiece 15, and the through hole 19 can be formed. The second chamfering cutting blade 7 can also chamfer sharply on the opening edge 19b on the exit side (back side).

  Further, in the chamfering cutter 1 according to the present embodiment, the neck portion 3 is interposed between the shank 2 and the cutting portion 4, and the first chamfering cutting edge 6 extends from the tip of the cutting portion 4 toward the central portion. And the second chamfering cutting edge 7 extends from the central portion of the cutting portion 4 toward the tip side of the neck portion 3 so as to have a smaller diameter. The sharp first chamfering cutting edge 6 and the sharp second chamfering cutting edge 7 can be easily formed by providing the relief groove 5 extending obliquely in the portion from the tip to the neck portion 3.

  Further, in the chamfering apparatus 10 according to the present embodiment, the tip of the chamfering cutter 1 is adjusted while adjusting the relative position between the object to be cut 15 having the through hole 19 and the chamfering cutter 1 held by the chuck mechanism 11. The first chamfering cutting blade 6 formed on the side is brought into contact with the opening-side opening edge 19a of the through hole 19, and in this state, the chamfering cutter 1 is rotated around the axis in one direction (for example, the forward rotation direction). Thus, the opening edge 19a on the inlet side of the through hole 19 can be chamfered. Further, the cutting portion 4 of the chamfering cutter 1 is inserted into the through hole 19 from the inlet side, and the second chamfering cutting blade 7 formed at the rear end side of the cutting portion 4 is provided with an opening edge of the through hole 19 on the outlet side. The chamfering cutter 1 is brought into contact with the groove 19b, and in this state, the chamfering cutter 1 is rotated in the other direction around the axis (reverse direction), whereby the opening-side opening edge 19b of the through hole 19 can be chamfered.

  It should be noted that the present invention is not limited to the above-described embodiments, and various modifications are included. For example, the above-described embodiments have been described to explain the present invention in an easy-to-understand manner, and the present invention is not necessarily limited to those having all the configurations described.

DESCRIPTION OF SYMBOLS 1 Chamfering cutter 2 Shank 3 Neck part 4 Cutting part 5 Escape groove 6 1st chamfering cutting edge 7 2nd chamfering cutting edge 10 Chamfering processing device 11 Chuck mechanism 12 Rotating mechanism 13 Z direction moving mechanism 14 XY direction moving mechanism 15 Object to be cut 16 Placement table 17 XY table 18 Control section 19 Through hole 19a Inlet side opening edge 19b Outlet side opening edge

Claims (4)

A shank that extends in the axial direction and is connected to the rotary drive unit; and a cutting unit provided on the tip side of the shank,
The cutting portion has a relief groove that extends obliquely with respect to the axial direction of the shank, and a first chamfering cutting edge is formed at a tip side position in one peripheral edge portion of the relief groove, A second chamfering cutting edge is formed at a rear end side position in the other peripheral edge portion of the escape groove,
Chamfering cutter characterized by that. The chamfering cutter according to claim 1,
A neck portion is provided between the shank and the cutting portion, and the first chamfering cutting edge extends from the tip of the cutting portion toward the central portion to have a large diameter, and A chamfering cutter, wherein the second chamfering cutting edge extends from the central portion of the cutting portion toward the tip side of the neck portion so as to have a small diameter. The chamfering cutter according to claim 1 or 2,
A plurality of the relief grooves are provided at different positions along the circumferential direction of the cutting portion, and the first chamfering cutting edge and the second chamfering cutting edge are respectively formed in these relief grooves. A characteristic chamfering cutter. A chuck mechanism for holding the chamfering cutter according to any one of claims 1 to 3, a rotation mechanism for rotating the chamfering cutter held by the chuck mechanism around an axis, and the chuck mechanism held by the chuck mechanism. A moving mechanism capable of relatively moving the chamfering cutter in the axial direction and the radial direction,
The rotating mechanism rotates the chamfering cutter in either one of the forward and reverse directions when chamfering the opening-side opening edge of the through-hole formed in the workpiece with the first chamfering cutting blade. When the opening edge on the outlet side of the through hole is chamfered by the second chamfering cutting blade, the chamfering cutter is rotated in either forward or reverse direction,
A chamfering device characterized in that

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