JP2000190116A - Inserted milling cutter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To scarecely change the axial direction position of a cutting blade in comparing with before grinding, even if the rake face of an blade body with a lateral relief angle is ground and installed again like the form milling cutter for woodworking called as a chamfering cutter. SOLUTION: In a formed cutter 11 consisting of back seats 31 stored in the plural cutter grooves 13 provided on the outer periphery of a milling cutter main body 12, blade bodies 21 pressed and fixed to the rear district 14 of the rotation direction of the cutter grooves 13 by the back seats 31 and the means for fixing the back seat 31, the slant surface 27 slanted by the same angle as the lateral relief angle of the blade body is provided on the side surface of the blade body 21, while the supporter 38 for positioning the axial direction position of a cross line portion, contacted to the edge body 21, on which the slant surface 27 and the blade body rake face 22 are crossed to a constant is provided on the milling cutter main body 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an implantable (replaceable blade) type milling cutter used for cutting wood, wood-based materials, synthetic resin-based materials, and soft metal materials or similar. The present invention relates to a technique for preventing the position of a cutting blade from changing even when the blade body rake face is polished and then reattached, and more particularly to a technique for preventing a change in a milling rotation axis direction.

[0002]

2. Description of the Related Art When using a cutting blade type milling cutter, when the rake face of the blade body is polished, the cutting edge position changes with the polishing, so that the cutting radius is reduced. In order to save the trouble of adjusting the position of the blade edge at this time, a technique for preventing the cutting radius from changing even if the blade body is polished and reattached is disclosed in, for example, Japanese Patent Application Laid-Open No.
No. 174509. This is because, when the blade rake face is polished, the thickness of the blade is reduced,
Since the pressing position of the backing for pressing the blade body is moved, the back body is slid along the inclined surface at this time, so that the blade body is displaced by a predetermined amount in the cutting radial direction together with the backing. Things.

[0003]

However, as shown in FIGS. 20, 21 and 22, a full-form milling cutter having a blade body 100 having an outer clearance angle β ₁ and a blade body clearance angle β ₂ (for example, In a woodworking general-purpose milling cutter called a chamfering cutter, when the blade body rake face 101 is polished and attached again, not only does the cutting radius change, but also the milling rotation axis direction of the tip of the cutting edge (hereinafter, simply referred to as the axial direction). Also changes at the same time. In the figure, 102 and 103 are cutting blades, 104 is a lateral flank, P is a cutting edge (corner), Dc
Indicates a cutting circle. In this case, the change in the cutting diameter caused by the outer peripheral clearance angle β ₁ can be eliminated by the above-described technique, but the axial displacement of the cutting edge P cannot be dealt with. That is, in the blade body front view of FIG. 22, when the blade body rake face 101 is polished by an amount δ that is hatched, the cutting blade tip changes from P to P ′ due to the blade body lateral clearance angle β ₂ , Since the height position h changes, a cut surface having a desired shape cannot be obtained. Therefore, each time the blade body 100 is polished, it takes time and effort to adjust the position at the time of mounting.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide an implantable milling cutter having a simple mechanism in which the position of the cutting edge does not change even if the blade rake surface is polished and remounted. It is intended for.

[0005]

For this purpose, the following blade-type milling cutter has been created. The first invention is claim 1
This is the configuration as described in (1). In this specification, the axis in the axial direction or the axis perpendicular to the axis refers to the rotation axis of the milling body (body). Also, the blade side clearance angle is
It is an angle indicating the inclination of the (sub) flank intersecting the outer peripheral (main) flank with respect to the cut finished surface. In this case, the blade lateral flank angle is in the vicinity of the cutting edge extending in a direction away from the rotation axis. The angle between the flank and the plane perpendicular to the axis is indicated as β _{2 in} the front view of this specification. This blade side clearance angle β ₂
Is defined to facilitate the description of the present invention.

[0006] When the blade body of the above-mentioned blade type milling cutter is pressed and fixed to the rotation-direction rear surface of the blade groove by the back seat, the inclined surface provided on the side surface of the blade body and the blade through the positioning portion of the milling body. The axial position of the intersection line intersecting the rake face is positioned. That is, since the blade body having the blade body lateral clearance angle of the same angle as this inclined surface is positioned at a constant axial position of the cutting blade, the blade body is polished when the blade rake face is polished. A change in the position of the cutting edge in the axial direction caused by having the blade body clearance angle is corrected.

A second aspect of the present invention is a configuration according to a second aspect. When pressing and fixing the blade body of this implantable milling cutter against the back surface in the rotation direction of the tool groove by the back seat,
The axial position of the back seat is positioned by the back support portion of the milling body, and through the positioning portion of the back seat, the intersection of the inclined surface provided on the side surface of the blade and the rake surface of the blade intersects. The axial position is determined. That is, since the axial position of the cutting blade is fixed, the change in the axial cutting blade position caused by the blade having a lateral clearance angle of the blade when the blade rake surface is polished. Is corrected.

In the first and second aspects of the present invention, the positioning portion may be constituted by a contact portion which comes into contact with the inclined surface and the blade body rake surface. In this case, it is preferable that the contact portion that comes into contact with the inclined surface be an inclined surface that is inclined at the same angle as the blade body lateral clearance angle. With this configuration, the inclined surfaces can be brought into close contact with each other, and the support and positioning of the blade body are stabilized and ensured.

Further, the positioning portion may be constituted by a contact surface for directly contacting an intersection (corner portion of the blade) at which the rake face of the blade and the inclined surface intersect. For example, in a bladed milling cutter, an inclined surface that is inclined at the same angle as the lateral clearance angle of the blade is provided on the side surface of the blade, while the intersection of the inclined surface and the rake surface of the blade intersects the milling body side or the back seat side. A configuration is provided in which a positioning surface that is orthogonal to the rotation axis that the line portion can contact is provided. In this case, the positioning surface is a stopper having a simple function of restricting the axial movement of the blade body.

A third aspect of the present invention is a configuration as described in claim 3. When attaching the blade body in this bladed type milling cutter, the side surface of the blade body is brought into contact with the positioning portion of the back seat, and the axial position of the back seat is positioned by the back seat support portion of the milling body. The blade body is pressed and fixed to the back surface in the rotation direction of the blade groove by the back seat. In this state, a predetermined blade body side clearance angle is set, and the axial position of the intersection line where the blade body side surface and the blade body rake surface that are inclined at the same angle as the blade body side clearance angle intersects is constant. Is positioned. Therefore, when the blade body rake face is polished and the blade body is attached again, a change in the axial cutting edge position caused by the blade body being given a blade body lateral clearance angle is corrected.

By the way, in each of the above-mentioned embodiments, for example, as disclosed in Japanese Patent Application Laid-Open No. 9-174509, an inclined surface formed on a blade groove and an inclined surface formed on a back seat abutting the inclined surface. Means for correcting a change in the cutting radius when the blade rake face is polished can be configured.

[0012]

Next, an embodiment of the present invention will be described. [First Embodiment] FIG. 1 is a perspective view of a general-purpose milling machine according to a first embodiment, and FIG. 2 is a diagram in which the vertical shape of the general-purpose milling machine is inverted. 3 to 5 are partial views of the same milling cutter. FIG. 3 is a view from the front of the blade body, FIG. 4 is a top view of the same milling cutter, and FIG. 5 is a view from the rake face side of the blade body. FIG. As shown in FIGS. 1 to 5, the forming mill 11 includes a milling body 12, a blade body 21, and a back seat 31 that are driven to rotate. On the outer peripheral side of the milling body 12, for example, a blade groove 13 for accommodating the blade body 21 and the back seat 31 is formed at equal intervals at a central angle of 90 degrees of the outer periphery. This blade groove 13 has a substantially vertical rear surface in the rotation direction (also referred to as a blade body contact surface) 14 and a backing support surface 15 forming a predetermined angle θ with respect to a surface C orthogonal to the rear surface 14 in the rotation direction. And a backing support surface 16 extending in parallel with the backing support surface 15 from the opening edge of the blade groove 13. In addition, the rotation direction rear surface 14
The milling body 1
A screw hole 17 extending horizontally from the outer peripheral side of 2 penetrates, and a set screw 18 capable of pushing the back plate 31 along the pair of back plate support surfaces 15 and 16 is screwed. . A hemispherical contact member is attached to the tip of the set screw 18 so as to be able to rotate and adjust the posture. A disk-shaped support member 41 is provided on an end surface on the lower surface side of the milling body 12 to abut against the backing 31 and position the backing 31 in the axial direction (the rotation axis direction of the milling body 12) at a constant position. An attachment part for attaching the screw, specifically, a screw hole 19 is formed.

The blade body 21 has a blade body back surface 23 on the opposite side of the blade body rake surface 22 and a rotation surface rear surface 14 of the blade groove 13.
The blade body side surface 24 illustrated as an upper surface side in FIGS. 1 and 3 is formed in a horizontal shape,
An outer peripheral cutting blade 25 and a curved cutting blade 26 are formed, and an inclined surface 27 is formed on a side opposite to the blade body side surface 24. The blade body 21 is provided with an outer peripheral clearance angle β ₁ and a blade body lateral clearance angle β ₂ , and the inclined surface 27 is provided with a rotating shaft (and a blade rake surface 2).
The same angle τ as the blade body clearance angle β ₂ with respect to the plane orthogonal to 2)
It is inclined. In the drawing, reference numeral 28 denotes an outer peripheral flank, and reference numeral 29 denotes a lateral flank. Specific blade shapes include, for example, a cutting edge angle α ₁ = 50 °, an outer clearance angle β ₁ = 20 °, and a rake angle γ.
₁ = 20 °, lateral edge angle α ₂ = 80 °, blade side clearance angle β ₂
= 10 °. In this case, the predetermined angle θ is 25 °
24 ′ (tan θ = tan (β ₁ + γ ₁ ) −tan
γ ₁ ). The rake face 22 of the blade body 21 is provided with an engagement recess 30 which engages with a back seat 31 described below.

The back seat 31 has a cross-sectional shape that fits into the remaining portion of the blade groove 13 where the blade body 21 is mounted.
An engagement projection 32 that fits into and engages with the engagement recess 30 is projected. The backing 31 includes contact surfaces 33 and 34 that contact the blade rake surface 22 and backing support surfaces 15 and 16 of the blade 21.
The back seat back surface 3 is located on the opposite side to the rear surface 14 in the rotational direction.
7 receives a pressing force of a set screw 18 which is a fixing means. Furthermore, one end of the backing 31 has a blade 2
A support portion 38 having an inclined surface 38 a inclined at the same angle τ as the one inclined surface 27 is provided in a protruding manner, and is formed so as to be able to adhere to the inclined surface 27. Reference numeral 39 in the drawing denotes a contact portion having a horizontal contact surface in which the end of the back seat 31 is cut out, and comes into contact with a support member 41 attached and fixed by a countersunk screw 42 screwed into the screw hole 19. Thereby, in a state where the backrest 31 can be moved in the horizontal direction (the direction in which the backrest 31 comes into contact with the rear surface 14 in the rotation direction), the position of the backrest 31 in the axial direction (the rotation axis direction of the milling body 12) is fixed. It has become so.

When attaching the blade body 21 to the milling body 12 after the blade body rake face 22 is polished again, for example, the engaging recess 30 of the blade body 21 is first fitted to the back seat 31.
The blade body rake face 22 is brought into contact with the contact faces 33 and 34 by engaging with the engagement projections 32 of the
7 is brought into contact with the inclined surface 38a of the back seat 31 and inserted into the blade groove 13 in a state where the two are integrated, and further, the contact portion 39 of the back seat 31 is brought into contact with the support member 41. Note that S in FIG. 4 is a space, and the blade rake face 22 can be polished until the space S becomes zero.

The contact portion 39 of the backing seat 31 is
The fixing screw 18 for fixing is screwed in while being kept in contact with the backing 1, and the backing 31 is pressed toward the rear surface 14 in the rotation direction, so that the backing 31 side is along the backing support surfaces 15, 16. The blade body rear surface 23 is brought into close contact with the rear surface 14 in the rotation direction, and the blade edge of the blade body 21 projects to a predetermined position. Back support surface 1
As described above, 5 and 16 are inclined at a predetermined angle θ with respect to the plane C perpendicular to the rear face 14 in the rotation direction, and the backing base 31 re-polishes the blade rake face 22 compared to before re-polishing. When the blade 21 is moved in parallel by the amount (δ), the blade 21 moves along the rear surface 14 in the rotation direction in accordance with the movement of the backing 31. At this time, the angle θ defining the amount of protrusion of the blade body 21 (that is, the cutting radius) is set so that the cutting diameter D does not change when the blade body 21 is re-ground and the blade body 21 is attached again (the error can be ignored in practical use). (To the extent) that value is set.

On the other hand, looking at the axial position of the cutting blade, the blade rake face 22 is in contact with the contact faces 33 and 34, and the inclined face 27 is in contact with the inclined face 38a of the support portion 38. The axial position at the intersection of the inclined surface 27 and the blade rake surface 22 is the same as the axial position before polishing. That is, as shown in FIG. 6, when the blade rake face 22 is polished by an amount δ that is hatched, the cutting edge (corner portion) changes from P to P ′, but the inclination angle β ₂ = τ. , The height H from the intersection line Q where the inclined surface 27 intersects the blade rake surface 22 to the tip P of the cutting edge, and the height H ′ from Q ′ to P ′.
Is the same. That is, if Q 'is positioned at the same height as Q, the axial position of the cutting edge P' remains constant. As described above, the position of the outer peripheral cutting edge 25 and the cutting edge 26, that is, the cutting radius and the axial position of the cutting edge are substantially changed by a simple method (mechanism) of pressing and fixing the polished blade body 21 to a predetermined position. Since the correction is made to be constant, the trouble of fine adjustment at the time of attaching the blade body can be greatly simplified. And the shape of the cutting edge, that is, the shape of the cutting surface is maintained even after re-polishing, so that the working efficiency is improved.

In this embodiment, the contact surfaces 33 and 34 are used.
The inclined surface 38a serves as a positioning portion according to the present invention. By providing the positioning portion on the backing 31, the conventional milling body 12 can be used as it is.

[Second Embodiment] Next, a second embodiment of an implantable milling cutter according to the present invention will be described with reference to FIGS. This milling-type milling machine is obtained by replacing the backing seat 31 in the first embodiment with a backing seat 51, that is,
The shape of the support portion 38 of the back seat 31 is changed, and the milling body 12 and the blade body 21 are the same as those in the first embodiment. As shown in both figures, a support portion 53 having a support surface 52 orthogonal to the blade rake surface 22 is protruded from one end of the back seat 51. When the blade body 21 is fixed in a state where the blade body rake surface 22 is in contact with the contact surfaces 54 and 55 of the back seat 51, an intersection line where the blade body rake surface 22 and the inclined surface 27 intersect ( By contacting the corners of the blade body with the support surface 52, the milling body 12 can be positioned in the axial direction. Therefore, the same operation and effect as described in the first embodiment can be obtained.

[Third Embodiment] Next, a third embodiment of an implantable milling cutter according to the present invention will be described with reference to FIGS. In this type of milling cutter, the backing seat 31 in the first embodiment is replaced by a backing seat 61 without a support portion 38, and the positioning of the blade body 21 is performed by a support member 41 instead of the support portion 38. It was done. As shown in both figures, the end face 62 of the backing 61 is
Are formed in a horizontal shape orthogonal to the axis of the blade body and the blade body rake face 22, and the disk-shaped support member 41 comprises a backing seat 61 and a blade body 21.
Can be simultaneously contacted (position that interferes with blade groove 13)
And attached to the milling body 12. That is, the support member 4 fixed to the milling body 12
An abutting line portion (corner of the blade body 21) where the blade body rake surface 22 and the inclined surface 27 intersect with the one contact surface 42 so as to be positioned in the axial direction. Therefore, the same operation and effect as described in the first embodiment can be obtained.

[Fourth Embodiment] Next, a fourth embodiment of an implantable milling cutter according to the present invention will be described with reference to FIGS. While the bladed milling cutter described in the first embodiment has a configuration having a positioning portion on the lower side in FIG. 3, the bladed milling cutter is positioned on the opposite side, that is, on the upper side in FIG. 11. This is an example in which a unit is provided.
The blade body 71 shown in both figures has the same cutting edge shape as the blade body 21 described above, and the side surface opposite to the inclined surface 27 of the blade body 21, that is, the surface shown on the upper side in FIG. However, the inclined surface 72 is inclined at the same angle as the lateral flank 73. On the other hand, the engagement protrusion 77 is provided on the
A support portion 78 having an inclined surface 78a that comes into contact with the inclined surface 72 is provided in a state where the support portion 78 is fitted in the engagement concave portion 74. The support member 41 attached to the milling body 12
Is formed so as to contact the contact portion 79 of the back seat 76. Then, the axial position of the back seat 76 is fixedly positioned by the support member 41, and the blade rake surface 75 and the inclined surface 72 contact the back seat 76, so that the blade rake surface 75 and the inclined surface The position of the intersection line intersecting with 72 is positioned in the axial direction. Therefore, the same operation and effect as described in the first embodiment can be obtained.

[Fifth Embodiment] As shown in FIGS. 13 and 14, a blade-type milling cutter according to a fifth embodiment is configured such that a blade body 81 having no blade body side clearance angle is provided with a blade body side clearance angle. It was attached at an angle. In this example, a cutter groove 86 inclined at a predetermined angle with respect to the rotation axis is provided in the milling body 85.
So that the side surface (lower side surface in the figure) of the blade body 81 accommodated in the blade groove 86 is brought into contact with the inclined surface 88 a orthogonal to the blade body rake surface 82 provided on the support portion 88 of the back seat 87. I have. That is, the blade body 81 has a blade body rake face 8
2 and the side surface 83 come into contact with the back seat 87, so that the axial position of the intersection line where the blade body rake surface 82 and the side surface 83 intersect is fixed. Therefore, the same operation and effect as described in the first embodiment can be obtained.

[Sixth Embodiment] Next, a sixth embodiment of the cutting blade type milling machine according to the present invention will be described with reference to FIGS. FIG. 15 is a diagram illustrating a state in which a workpiece W is processed by combining two types of blade bodies 21 and 91 having different cutting blade shapes. In the present embodiment, the milling body 12, the blade groove 13, the back seat 31, the support member 41, and FIG.
The blade body 21 shown in FIGS. 6 and 17 has the same configuration as that of the above-described first embodiment. In both figures, 22 is the blade rake face,
29 is a side flank, 27 is an inclined surface, 38 is a backing 31
It is a support part formed in. The two blades 21 and 91 are alternately mounted on the outer peripheral side of the milling body 12, for example, in four blade grooves 13 formed at equally spaced positions at a central angle of 90 degrees on the outer periphery.

As shown in FIG. 18 and FIG. 19, the blade body 91 has a cutting blade having a shape in which the top and bottom of the blade body 21 are inverted to make the opposite side. However, the cutting blade shapes of the blade bodies 21 and 91 need not be (vertically) symmetric with respect to the plane perpendicular to the axis. In the figure, reference numeral 92 denotes a blade rake surface of the blade body 91, 93 denotes a lateral flank, and 94 denotes an inclined surface inclined at the same angle as the lateral flank 93. In addition, the backing seat 95 connects the support portion 38 of the backing seat 31 with:
Supporting part 9 having inclined surface 98a that can slide and contact inclined surface 94
8 for other shapes.
There is no difference from 1. That is, this blade body 91
The intersection line where the blade rake surface 92 and the inclined surface 94 intersect by the blade body rake surface 92 abutting on the contact surface 96 of the back seat 95 and the inclined surface 94 abutting on the inclined surface 98 a of the back seat 95. Are fixedly positioned in the axial direction. Therefore, the two blades 21 and 91 have the same operation and effect as described in the first embodiment.

In addition, it is a matter of course that the present invention can be implemented in various modified embodiments based on the knowledge of those skilled in the art.

[0026]

As described in detail above, in the implantable milling cutter of the present invention, when the blade having the lateral clearance angle of the blade is re-ground and mounted again, the position of the cutting blade is corrected and fixed. Therefore, fine adjustment at the time of mounting can be greatly simplified, and the processed shape of the work hardly changes before and after re-grinding. In other words, the effect that the blade body can be easily and quickly attached and the working efficiency is improved is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of a form milling machine according to a first embodiment.

FIG. 2 is an inverted view of the form milling machine of FIG. 1;

FIG. 3 is a partial view of the form milling machine according to the first embodiment as viewed from the front of a blade body.

FIG. 4 is a partial view of the form milling machine of FIG. 3 as viewed from above.

FIG. 5 is a partial view of the form milling machine of FIG. 3 as viewed from a blade rake face side.

FIG. 6 is an enlarged view of the blade body as viewed from the front.

FIG. 7 is a partial view of a form milling machine according to a second embodiment as viewed from the front of a blade body.

8 is a partial view of the form milling machine of FIG. 7 as viewed from above.

FIG. 9 is a partial view of a form milling machine according to a third embodiment as viewed from the front of a blade body.

FIG. 10 is a partial view of the form milling machine of FIG. 9 as viewed from above.

FIG. 11 is a partial view of a form milling machine according to a fourth embodiment as viewed from the front of a blade body.

FIG. 12 is a partial view of the form milling machine of FIG. 11 as viewed from above.

FIG. 13 is a partial view of a form milling machine according to a fifth embodiment as viewed from the front of a blade body.

FIG. 14 is a partial view of a form milling machine according to a fifth embodiment viewed from a blade rake face side.

FIG. 15 is a diagram illustrating cutting by a form milling machine according to a sixth embodiment.

FIG. 16 is a partial view of a blade of a form milling machine according to a sixth embodiment as viewed from the front of the blade.

FIG. 17 is a partial view of the blade body of FIG. 16 as viewed from the blade rake face side.

FIG. 18 is a partial view of the blade of the form milling machine according to the sixth embodiment as viewed from the front of the blade.

19 is a partial view of the blade of FIG. 18 as viewed from the blade rake face side.

FIG. 20 is a perspective view of a blade body according to a conventional example.

FIG. 21 is a perspective view of the blade body of FIG.

FIG. 22 is a front view of a blade body according to a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 Form milling machine 12 Milling body 13 Blade groove 14 Rotational rear surface 21 Blade body 22 Blade rake surface 25 Outer peripheral cutting blade 26 Cutting blade 27 Inclined surface 28 Outer peripheral flank 29 Lateral flank 31 Back seat 38 Supporting part 41 Supporting member

Claims (3)

[Claims] 1. A plurality of cutter grooves are provided on an outer peripheral portion of a milling body, a back seat accommodated in the cutter grooves, and a blade body pressed and fixed by the back seat against a rear surface of the cutter grooves in the rotation direction. Means for fixing the back seat, wherein at least one side surface of the blade body is provided with an inclined surface inclined at the same angle as the blade body side clearance angle, while the milling body is provided with the inclined surface. Blade milling cutter provided with a positioning portion for positioning an axial position of an intersection line where the blade and the blade rake face intersect. 2. A plurality of cutter grooves are provided on an outer peripheral portion of a milling body, a back seat accommodated in the cutter grooves, and a blade body pressed and fixed by the back seat against a rear surface of the cutter grooves in a rotation direction. Means for fixing the back seat, wherein at least one side surface of the blade body is provided with an inclined surface inclined at the same angle as the blade body side clearance angle, while the milling body is provided with the back seat. Providing a backing support that positions the axial position,
Further, a blade-type milling cutter provided with a positioning portion for positioning an axial position of an intersection line where the inclined surface and the blade rake surface intersect with each other on the back seat. 3. A plurality of blade grooves are provided on an outer peripheral portion of the milling body, a back seat accommodated in the blade grooves, and a blade body pressed and fixed by the back seat against a rear surface in the rotation direction of the blade grooves. The blade body itself is not provided with a blade body side clearance angle, and the blade body side clearance angle according to the mounting angle of the blade body with respect to the milling body. The milling body is provided with a backing support portion for positioning an axial position of the backing, and the backing has an intersection line where a blade side surface and a blade rake surface intersect. An implantable milling cutter provided with a positioning part for positioning the axial position of the blade.