JP2002326116A - End mill for relieving process - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily recognize a position to have a relieving surface in relieving a work material. SOLUTION: Three grooves 18 are formed at a predetermined interval d from a position of a base end side cutting edge 16 toward the base end side of an end mill body in the end mill body 11 so that the grooves ride the entire loop around the outer peripheral surface 11B in a direction orthogonal to the axial line O. Three grooves 18 are stained with different colors. Depth of the grooves 18 is set in a range from 0.2 to 0.5 mm. Respective proximities of the grooves 18 on the outer peripheral surface 11B have a value indicating a distance from the base end side cutting edge 16 in the axial lien O direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a second cutting end mill used for, for example, a second cutting of a die.

[0002]

2. Description of the Related Art For example, as shown in a sectional view of a main part of FIG. 4, in a mold 1 used as a punch, an inner peripheral surface 2 has a lower surface than a predetermined distance D from an upper surface 1A. By forming the second-cut surface 2A by performing a second-cut process so that the portion is depressed one step at a predetermined second-cut depth, it is intended to improve the punching process of the punched workpiece. That is, on the inner peripheral surface 2, a step portion 3 between the second peripheral surface 2A and the inner peripheral surface 2 that has not been subjected to the second peripheral processing is formed at a position away from the upper surface 1A by a predetermined distance D.

[0003]

When the die 1 is subjected to the second machining as described above, the inner peripheral surface 2 of the die 1 which is a processing location cannot be seen from the work place of the operator. In some cases, it is necessary to perform the second machining in the state. In such a case, in the end mill used for the second machining, the base end for cutting and forming the step 3 of the inner peripheral surface 2 is used. It is difficult to determine whether or not the side cutting edge is exactly at a predetermined distance D from the upper surface 1A, and there is an error in the length (the predetermined distance D) of the inner peripheral surface 2 from the upper surface 1A where the second cutting is not performed. There was a problem that occurs. In such a case, the operator may make inferences based on the intuition of the operator, or the operator may go around in a direction in which the processed portion of the inner peripheral surface 2 of the mold 1 can be seen, and the stepped portion of the second cutting surface 2A may be formed. It is necessary to visually confirm that the base-side cutting edge forming the stepped portion 3 is located at the position where the step 3 is to be formed, and then to perform a second cutting process. The working efficiency of the processing was getting worse.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above-mentioned problem. It is intended to provide an end mill.

[0005]

SUMMARY OF THE INVENTION In order to solve the above problems,
In order to achieve such an object, the present invention provides an outer peripheral cutting edge protruding toward the outer peripheral side of an end mill main body at a distal end portion of a substantially cylindrical end mill main body that is rotated around an axis; A base cutting edge that intersects at the base end side of the end mill main body, and a second cutting end mill used for second cutting of a work material, wherein the second cutting end mill is closer to the base end than the base cutting edge. An index indicating an axial distance from the base cutting edge is provided on an outer peripheral surface of the end mill main body located. With such a configuration, even when the processing location for performing the second machining on the work material cannot be seen from the work place of the operator, the workpiece is positioned closer to the end side of the end mill main body than the base side cutting edge. By using the index indicating the distance in the axial direction from the base cutting edge as a guide, the protrusion length of the second milling end mill with respect to the work material, that is, the base cut side with respect to the upper surface of the work material, It is easy to check how far the blade is located.
For this reason, as in the prior art, the position at which the second cut surface is formed on the work material, that is, the position at which the stepped portion is formed by the second cut surface is estimated based on the intuition of the operator, It goes around in the direction where the processed part of the material can be seen,
There is no need for a procedure of visually confirming the position where the second cut surface is formed and then performing the second cut processing.

[0006] For example, when the present invention is applied to a throwaway type end mill for double cutting, a plurality of throwaways are provided on the outer periphery of a substantially cylindrical endmill body which is rotated around an axis. The chips are arranged such that their main cutting edges protrude toward the outer peripheral side of the end mill main body to form outer peripheral cutting edges, and the rotation trajectories of the outer peripheral cutting edges around the axis overlap each other, and Of the throw-away inserts, the throw-away insert located at the most proximal side of the end mill main body has a sub-cutting edge crossing the outer peripheral side cutting edge at the end mill main body base end side protruding toward the outer peripheral side of the end mill main body. A side-cutting end mill for secondary cutting used for secondary cutting of a work material, wherein the cutting edge is located closer to the base end than the base side cutting edge. The outer peripheral surface of the end mill body that,
What is necessary is just to provide the index which shows the distance of the axial direction from the said base end side cutting blade.

A plurality of the indicators are provided at regular intervals in the axial direction. With such a configuration, even when the position where the step portion due to the second machining is to be formed differs depending on the work material, one of the plurality of indices provided at equal intervals is selectively used as a guide. By using this, it is possible to cope with the second cutting process even for various types of work materials having different positions where the second cutting surface is to be formed.

[0008] Further, the indicator is a groove formed in a direction perpendicular to the axis. When the index is constituted by a groove, the groove has a certain width, so that the groove serving as the index can be clearly confirmed even while the end mill body is rotating.

[0009] The groove is colored. With such a configuration, it is possible to color-code according to the axial distance from the proximal cutting edge to the groove serving as the index, and easily know the axial distance from the proximal cutting edge to the index. be able to.

The depth of the groove is 0.2 to 0.5.
mm. With such a configuration, the grooves are not easily seen or the grooves are formed in the end mill main body, so that the rigidity of the end mill main body is not unnecessarily reduced.

A numerical value representing a distance in the axial direction from the base side cutting edge is indicated near the index of the end mill main body. With such a configuration, the axial distance from the proximal cutting edge to the index can be easily confirmed specifically in the stationary state of the end mill main body.

[0012]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1A is a side view of the indexable end mill for the second pre-machining processing according to the present embodiment, FIG. 1B is a front end view of the end mill, and FIG. 2 is a diagram showing grooves provided in an end mill body of the end mill. It is a part enlarged sectional view.

As shown in FIG. 1, a throwaway type end mill 10 for a pre-machining process according to the present embodiment has a substantially cylindrical end mill body 1 which is rotated around an axis O.
The end diameter of the end portion 11A of the end mill main body is increased by one step. Four tip pockets 12 are formed at substantially equal intervals in the circumferential direction on the outer periphery of the end of the end portion 11A of the end mill body.

Here, a pair of tip pockets 12A, 12A of the tip pockets 12 which are located on the opposite sides with respect to the axis O of the end mill main body 11 are located from the distal end of the end mill main body distal end portion 11A to the proximal end side. As it moves, the end mill rotation direction T around the axis O (FIG. 1)
(Counterclockwise direction in (b)) The other pair of tip pockets 1 are formed to extend spirally rearward.
2B and 12B are formed only at the tip of the end portion 11A of the end mill main body.

The pair of tip pockets 12A,
12A is formed up to a substantially central portion in the direction of the axis O of the end portion 11A of the end mill main body. In the substantially central portion, the tip mill 12A is displaced in the circumferential direction from the pair of tip pockets 12A, 12A, and the tip pockets 12A, 12A and the axis O And a pair of tip pockets 12C, 12C located on opposite sides of the axis O so that the tip pockets 12C and 12C extend spirally around the axis O in the end mill rotation direction T in the same direction toward the base end side from here. Is formed.

The tip mounting seat 1 is provided on the wall surface of the tip pockets 12 facing the end mill rotation direction T.
3 are formed. In the pair of tip pockets 12A, 12A, four such tip mounting seats 13 are provided in a spiral staircase twisting rearward in the end mill rotation direction T from the tip of the end portion 11A of the end mill main body toward the base end. On the other hand, each of the other pair of chip pockets 12B, 12B has one
Only one is formed.

Further, the pair of chip pockets 12
A, a pair of tip pockets 12C, 12C located on the base end side of the end mill body with respect to the tip mounting seats 1A, 12A.
.. Are similarly formed in a spiral staircase twisting rearward in the end mill rotation direction T from the distal end side to the proximal end side of the end mill main body distal end portion 11A.

Each of the chip mounting seats 13 is detachably mounted with a chip 14 by a clamp screw (not shown). In the present embodiment, each of these chips 14 is of the same shape and size as a substantially parallelogram flat plate formed of a hard material such as a cemented carbide, and has one surface 14a forming a substantially parallelogram. The main cutting edges 14b, 14b are formed on both long side ridges, and the sub cutting edges 14c intersecting the main cutting edges 14b, 14b are formed on both short side ridges. , 14c are formed. The tips 14 are composed of main cutting edges 14b and 14b and sub cutting edges 14c and 14
A clearance angle is given to a side surface from c to the other surface that forms a substantially parallelogram, so that a positive chip is obtained.

When the tips 14 are mounted on the tip mounting seats 13, one of the main cutting edges 14b, 14b of the tips 14 protrudes toward the outer peripheral side of the end portion 11A of the end mill main body to form the outer peripheral side cutting edge 15. Further, the chips 14 are arranged such that the rotation trajectories of the outer peripheral cutting edges 15 of all the chips 14 around the axis O overlap with each other to form one cylindrical surface. In addition, in a total of four chips 14 located at the forefront of the end portion 11A of the end mill main body, a sub cutting edge 14c intersecting the outer peripheral side cutting edge 15 at the end side of the end mill main body at the front end side thereof is a bottom edge of the end mill 10. It has been.

Here, the pair of chip pockets 12
Tip mounting seat 1 formed at the most proximal side of C and 12C
A pair of chips 14, 14 mounted on the end mill main body 11 is located at the most proximal end of the end mill main body 11 among a plurality of chips 14 arranged on the outer periphery of the end mill main body distal end portion 11A. 14, one side 14 a of a substantially parallelogram is directed to the end mill rotation direction T side, and the outer peripheral side cutting edge 15 is projected to the outer peripheral side of the end portion 11 A of the end mill main body in parallel with the axis O.

Further, the tips 14, 14 located at the most proximal side of the end mill main body 11 are provided on the outer peripheral cutting edge 1 thereof.
5 is a sub cutting edge 14 that is continuous with the end mill body at the base end side.
c, that is, approximately half of the length of the sub-cutting edge 14c, which is located on the base end side of the end mill main body of the tip 14 and extends in a direction intersecting the axis O, protrudes toward the outer peripheral side of the end mill main body 11 so that the base end side cutting is performed. The blade 16 is used. At this time, since the end mill main body 11 excluding the end mill main body front end portion 11A is reduced in diameter by one step from the end mill main body front end portion 11A, the base end side cutting edge 16 becomes the end mill main body front end portion 11A.
1 and also protrudes on the outer peripheral side of the end mill main body 11 except for the end portion 11A of the end mill main body.

The angle between the outer peripheral cutting edge 15 and the proximal cutting edge 16 of the tip 14 located at the most proximal side of the end mill body 11 is set to an obtuse angle of 135 ° or less ( In the present embodiment, this angle is set to, for example, 93 °. In addition, the intersection 17 between the outer peripheral side cutting edge 15 and the proximal side cutting edge 16 is formed in a convex curve shape. In the embodiment, the intersection 17 is formed, for example, in a substantially arc shape.

Since the tip 14 has a substantially parallelogram flat plate shape, the outer peripheral side cutting edge 15 (the main cutting edge 1) is formed.
4b) and the main cutting edge 14b and the sub cutting edge 14c formed to face the base cutting edge 16 (the sub cutting edge 14c), respectively.
Is also set to an obtuse angle of 135 ° or less, and the intersection is formed in a curved shape.

The outer peripheral surface of a portion (a shank portion) on the base end side of the end mill main body, which is reduced in diameter by one step with respect to the end portion 11A of the end mill main body, has a base 14 of the tip 14 located at the most base end side of the end mill main body 11. A plurality of grooves 18 (three grooves in this embodiment) are provided at predetermined intervals d (for example, 10 mm in this embodiment) from the position of the end side cutting blade 16 toward the base end side of the end mill main body. 18)
It is formed so as to make a round around the outer peripheral surface 11B in a direction perpendicular to the axis O, and serves as an index indicating the distance from the proximal cutting edge 16 in the direction of the axis O.

The outer peripheral surface 11B of the end mill main body 11 on the tip end side of the end mill main body immediately adjacent to the groove 18 as this index is
Numerical values indicating the distance from the proximal cutting edge 16 are printed along the grooves 18 by, for example, a laser marker, and the distance from the proximal cutting edge 16 can be known at a glance for each of the grooves 18. It has become.

In the present embodiment, for example, 10 and further d are provided near the groove 18 provided at a predetermined distance d (= 10 mm) in the direction of the axis O from the base cutting edge 16.
20 is printed near the groove 18 provided at a distant position, and 30 is printed near the groove 18 provided at a position further d away from each other. The distance in the direction of the axis O from the side cutting blade 16 can be understood at a glance. Therefore, in FIG.
The distance from the upper surface 1A of the mold 1 to the position of the base-side cutting blade 16 is shown as 15 mm.

As shown in the enlarged sectional view of the main part of FIG. 2, the groove 18 is formed by a concave wall surface 19 having a substantially arcuate cross section when recessed from the outer peripheral surface 11B of the end mill body 11 to the inner peripheral side. On the wall surface 19, three grooves 18 are formed by paint, such as paint, respectively.
Each of the three grooves 18 is colored differently, such as yellow, blue, or the like.

Here, the groove width x in the direction of the axis O of the groove 18
It is preferred that the end mill has a width of, for example, about 1 mm so that the end mill main body 11 can be clearly visually checked even in a rotating state. In consideration of the visibility of the groove and the rigidity of the end mill body 11, the groove depth a of the groove 18 (the distance from the outer peripheral surface 11B of the end mill body 11 to the deepest part of the groove 18) is 0.2 to 0.2. It is preferable that the groove depth a is 0.2 mm.
When the groove depth is smaller, the groove 18 becomes difficult to see. On the other hand, when the groove depth a is larger than 0.5 mm, the rigidity of the end mill body 11 may be reduced.

By using the indexable end mill 10 for the second cutting process having the above-described configuration, for example, FIG.
Alternatively, when the inner peripheral surface 2 of the mold 1 as a work material as shown in FIG.
After inserting the indexable end mill 10 for second machining into B and positioning it, the second machining surface 2A is cut and formed with a plurality of outer peripheral cutting edges 15 protruding from the outer periphery of the end portion 11A of the end mill body, Furthermore, the end mill body 1
The step 3 between the second cutting surface 2A and the inner peripheral surface 2 that is not subjected to the second cutting is cut by the base cutting edge 16 of the tip 14 located closest to the base 1 of FIG.

Here, as described above, from the position of the proximal cutting edge 16 of the tip 14 located closest to the proximal end of the end mill body 11 that forms the step 3 on the inner peripheral surface 2 of the mold 1,
Since three grooves 18 are provided at predetermined intervals d in the direction of the axis O, the processing location of the inner peripheral surface 2 where the second machining of the mold 1 is to be performed cannot be seen from the work place of the operator. However, by using the groove 18 as an index, which is located on the base end side of the end mill main body with respect to the base side cutting edge 16 and indicates the distance from the base side cutting edge 16 in the direction of the axis O, Die 1 for indexable end mill 10 for secondary machining
, That is, how far the base-side cutting blade 16 is positioned with respect to the upper surface 1A of the mold 1 can be easily confirmed.

Therefore, as in the prior art, the position where the second cut surface 2A is formed on the inner peripheral surface 2 of the mold 1, that is, the position where the step 3 is formed by the second cut surface 2A, is intuitive for the operator. And the operator goes around in the direction in which the processing location of the inner peripheral surface 2 of the mold 1 can be seen, and visually confirms the position where the second processing surface 2A is formed before performing the second processing. There is no need for a procedure such as application, and work efficiency is good.

Further, since three grooves 18 are provided at equal intervals in the direction of the axis O, even if the position where the stepped portion 3 is formed by the second machining differs depending on the mold 1, By selectively using any one of the three grooves 18 provided at equal intervals as a guide, a variety of molds 1 having different distances from the upper surface 1A at the position where the second cutting surface 2A is to be formed can be formed. In this case, the indexable end mill 10 for secondary machining according to the present embodiment can be used.

Further, since the groove 18 is formed to have a groove width x of about 1 mm, the end mill body 1
The groove 18 which is clearly indicated even during one rotation
Can be visually confirmed. Further, since the three grooves 18 are colored in different colors by paint such as paint, for example, the base-side cutting blade 1 is selected according to the color.
It is possible to easily know the distance in the direction of the axis O from 6 to the groove 18 as an index.

The outer peripheral surface 11B of the end mill body 11
In each of the three grooves 18, a numerical value indicating a distance in the direction of the axis O from the base end side cutting edge 16 is printed on each of the three grooves 18.
The distance in the direction of the axis O from the base side cutting edge 16 to each groove 18 can be easily confirmed.

On the other hand, in the present embodiment, the end mill body 1
Since the angle formed between the outer peripheral side cutting edge 15 and the proximal side cutting edge 16 of the tip 14 located at the most proximal side of 1 is set to an obtuse angle of 135 ° or less, the die to be subjected to the second cutting is performed. 2 so as to form an obtuse angle of 135 ° or less with the stepped surface forming the stepped portion 3 between the second cutout surface 2A and the second cutout surface 2A and the inner peripheral surface 2 not subjected to the second cutout processing. Since the cutting process is performed, the strength near the stepped portion 3 of the inner peripheral surface 2 of the mold 1 can be kept high, and the risk of occurrence of quenching cracks during subsequent quenching can be reduced.

Also, the outer peripheral cutting edge 15 and the proximal cutting edge 16 of the tip 14 located at the most proximal side of the end mill body 11.
Is formed in a convex curve shape that forms a substantially circular arc, the intersection ridge line portion between the second cutting surface 2A of the mold 2 and the step surface can be formed as a concave curved surface. The strength near the step 3 can be kept higher.

The embodiment of the present invention has been described above. However, the shape of the groove as an index is not limited to the groove 18 as described above.
The groove 20 as shown in FIG. The groove 20 according to this modification is formed so as to be recessed from the outer peripheral surface 11B of the end mill main body 11 at a predetermined groove depth a to the inner peripheral side of the one-stage end mill main body, and the wall surface 21 facing the outer peripheral side of the end mill main body 11 is formed. And a step 22 between the wall surface 21 and the outer peripheral surface 11 </ b> B of the end mill main body 11.

The groove 20 as described above is formed so that the groove width x is equal to the distance d between the grooves 18 described above, and furthermore, the outer peripheral surface 11 between the grooves 20 is formed.
The distance in the direction of the axis O of B (the distance between the steps 22 of the adjacent grooves 20) is also d. As a result, the step 22 of the groove 20 serves as an index indicating the distance in the direction of the axis O from the proximal cutting edge 16, and the above-described effects can be obtained without any inconvenience.

Further, similarly to the above-described embodiment, a plurality of the grooves 20 are provided on the outer peripheral surface 11B of the end mill main body 11, and the wall surface 21 is colored differently from the wall surfaces 21 of the other grooves 20. Further, it is needless to say that the outer peripheral surface 11B of the end mill body 11 near the groove 20 indicates the distance in the direction of the axis O from the base cutting edge 16. Further, since the groove 20 has a groove width x (= d) larger than that of the groove 18, the groove depth a is given in consideration of the rigidity of the end mill body 11.
It is preferable to set smaller than the above-mentioned groove 18.

In this embodiment, the description has been made using the indexable type end mill for the second machining.
The present invention is not limited to this, and a solid end mill for second machining may be used.

[0041]

According to the present invention, the end mill body located closer to the base end than the base end cutting edge is provided with an index indicating the axial distance from the base end cutting edge. Even if it is not possible to see the processing location where the second machining is performed on the work material from the work place, by using the index located closer to the end side of the end mill body than the base side cutting edge, You can easily check how far the proximal cutting edge is located with respect to the upper surface of the work material,
It is possible to suppress the occurrence of an error in the position where the second cutting surface is formed. Therefore, as in the related art, the position where the second cut surface is formed, that is, the position where the stepped portion is formed by the second cut surface in the work material is estimated based on the intuition of the operator, or the operator There is no need to perform a procedure in which the material goes around in the direction in which the processed portion can be seen and the position where the second cut surface is formed is visually checked before the second cut process is performed.

Also, since a plurality of indices are provided at equal intervals in the axial direction, even when the position where the stepped portion formed by the second machining is different depending on the workpiece, a plurality of indices are provided. By selectively using any of the indices as a guide, it will be possible to respond to the second machining even for various types of work materials where the position to form the second machining surface is different, There is no need to prepare various end mills for secondary machining with different index positions.

Since the index is a groove formed in a direction perpendicular to the axis, it has a certain width,
Even during the rotation of the end mill main body, the groove serving as an index can be clearly confirmed. Also, since the grooves are colored, they can be color-coded according to the axial distance from the proximal cutting edge to the groove as the index, and the axial distance from the proximal cutting edge to the index Can be easily known.

The groove depth of the groove is 0.2 to 0.5 mm
, The groove is not easily seen, and the rigidity of the end mill body is not unnecessarily reduced. Further, in the vicinity of the index provided on the end mill main body, since a numerical value indicating an axial distance from the base side cutting edge is shown, the index from the base side cutting edge in the stationary state of the end mill main body is shown. The distance in the axial direction up to this point can be easily confirmed.

[Brief description of the drawings]

FIG. 1 (a) is a side view of a throwaway type end mill for double cutting according to the present embodiment, and FIG. 1 (b) is a front end view of the end mill.

FIG. 2 is an enlarged sectional view of a main part showing a groove provided in an end mill main body of the indexable type end mill for secondary cutting according to the present embodiment.

FIG. 3 is an enlarged sectional view of a main part showing a modified example of a groove provided in an end mill main body of the indexable end mill for second machining according to the present embodiment.

FIG. 4 is a cross-sectional view of a main part showing a work material subjected to a second cutting process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Indexable end mill for 2nd cutting 11 End mill main body 11A End mill main body tip portion 12 Tip pocket 13 Tip mounting seat 14 Tip 14b Main cutting edge 14c Secondary cutting edge 15 Outer side cutting edge 16 Base end side cutting edge 17 Intersection 18 , 20 groove 19, 21 wall surface 22 step

Claims (6)

[Claims] 1. A cutting edge protruding toward the outer periphery of an end mill main body at a distal end portion of a substantially cylindrical end mill main body rotated around an axis, intersects the outer cutting edge at a base end side of the end mill main body. A second cutting end mill used for second cutting of a work material, wherein the second cutting end mill includes a base cutting edge, and an outer peripheral surface of the end mill body located closer to the base end than the base cutting edge. And an index indicating an axial distance from the base side cutting edge is provided. 2. The end mill for second machining according to claim 1, wherein a plurality of the indexes are provided at equal intervals in an axial direction. 3. The end mill for second cutting according to claim 1, wherein the index is a groove formed in a direction perpendicular to an axis. . 4. The end mill according to claim 3, wherein the grooves are colored. 5. The end mill according to claim 3, wherein a depth of the groove is set in a range of 0.2 to 0.5 mm. . 6. The end mill for second machining according to claim 1, wherein an axial distance from the proximal cutting edge is set near the index of the end mill body. An end mill for a second-machining process, the numerical values of which are shown.