WO2013021856A1 - Cutting tool with coolant hole - Google Patents
Cutting tool with coolant hole Download PDFInfo
- Publication number
- WO2013021856A1 WO2013021856A1 PCT/JP2012/069414 JP2012069414W WO2013021856A1 WO 2013021856 A1 WO2013021856 A1 WO 2013021856A1 JP 2012069414 W JP2012069414 W JP 2012069414W WO 2013021856 A1 WO2013021856 A1 WO 2013021856A1
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- WO
- WIPO (PCT)
- Prior art keywords
- hole
- coolant
- blade
- branch
- cylindrical member
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/28—Features relating to lubricating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
- B23Q11/10—Arrangements for cooling or lubricating tools or work
- B23Q11/1015—Arrangements for cooling or lubricating tools or work by supplying a cutting liquid through the spindle
- B23Q11/1023—Tool holders, or tools in general specially adapted for receiving the cutting liquid from the spindle
Definitions
- the present invention relates to a cutting tool with a coolant hole in which a coolant hole for supplying coolant for cooling and lubrication is formed on a blade portion of a tool body.
- Patent Document 1 a cutting oil (coolant) supply port is formed at one end, and the other end is drilled in the direction of the central axis that opens to the center of the edge of the end mill (bottom blade center).
- An end mill with a coolant hole is proposed which is provided with a hollow shaft oil pipe and a hollow cutting oil jet port which communicates with the shaft pipe in the end mill shaft and has an end opening in the groove of the outer peripheral blade outside the end mill.
- Patent Document 2 includes an axial coolant hole that opens to the center of the tip of the end mill, and a branch hole that branches from the axial coolant hole and opens into the blade groove of the outer peripheral blade.
- An end mill with a coolant hole has been proposed in which the end of the axial coolant hole is closed with a plug during cutting, and the plug is removed during front cutting with a bottom blade.
- the present invention has been made under such a background, and as described above, a plurality of end mills such as an end mill having a branch hole toward the bottom blade at the end mill tip and a branch hole toward the outer peripheral blade at the outer periphery of the end mill as described above.
- coolant tool with coolant hole with branch hole formed coolant that does not waste coolant or require excessive supply pressure even when only one of the cutting edges is used It aims to provide a cutting tool with a hole.
- a coolant hole is formed in the tool body, and the coolant hole is branched into a plurality of branch holes in the blade portion of the tool body.
- the coolant hole is provided with switching means for selecting a branch hole for supplying the coolant among the plurality of branch holes.
- the switching means for example, when the branch hole is plugged with a plug like the cutting tool with a coolant hole described in Patent Document 2, when the number of branch holes is large, many switching operations are performed. It takes time and the management of the plug becomes complicated. Accordingly, the plurality of branch holes are branched while being shifted in at least one of the circumferential direction and the axial direction of the coolant hole, and the switching means is slidably contacted with the inner peripheral surface of the coolant hole and rotatably accommodated therein.
- a plurality of through holes are formed in the cylindrical member and the plurality of through holes communicate with each other, some of the through holes communicate with some of the plurality of branch holes.
- the tool body is formed of a hard material and the cylindrical shape is formed.
- the member is made of a metal material whose hardness is lower than that of the hard material, an annular groove is formed on the inner peripheral surface of the coolant hole, and the outer peripheral surface of the cylindrical member is formed on the inner peripheral surface of the coolant hole. What is necessary is just to be able to rotate in contact with this internal peripheral surface by closely_contact
- the cylindrical member Since the outer peripheral surface of the cylindrical member is engaged with the annular groove on the inner peripheral surface of the coolant hole, the cylindrical member is allowed to rotate and the movement in the axial direction can be restrained and prevented from coming off.
- the outer circumferential surface of the cylindrical member is in close contact with the inner circumferential surface of the coolant hole so as to be slidable, thereby preventing leakage of the coolant.
- the present invention is suitable for application to an end mill with a coolant hole as in the inventions described in Patent Documents 1 and 2, that is, an end mill in which the tool body has a bottom blade and an outer peripheral blade on the blade portion.
- the present invention it is possible to stop the supply of the coolant toward the cutting blade that is not used to prevent wasteful consumption of the coolant and to reduce the supply pressure of the coolant. It is possible to promote efficient cutting.
- FIG. 2 It is a perspective view which shows the head exchange type end mill with a coolant hole to which the cutting head which is the 1st Embodiment of this invention was attached. It is the (a) perspective view, (b) side view, (c) front view of the cutting head of embodiment shown in FIG.
- the head main body 1 is the head main body material 1A
- the head main body 1 is the head main body material 1A
- the coolant hole communicates with the outer peripheral edge branch hole
- FIG. It is ZZ sectional drawing in 2 (c).
- the head main body 1 is the head main body material 1A
- FIG. 2 shows ZZ sectional drawing in 2 (c).
- FIG. It is ZZ sectional drawing in 2 (c). It is (a) perspective view, (b) front view, (c) side view, (d) rear view, and (e) side sectional view of the head main body material 1A of the cutting head shown in FIG. (A) perspective view, (b) front view, (c) side view, (d) rear view, (a) of a cylindrical member material 3A that is a material of the switching means (cylindrical member 3) of the cutting head shown in FIG. e) Side sectional view. 6 is a cross-sectional view showing a state in which the switching means (cylindrical member 3) shown in FIG.
- FIG. 6 is attached to the head main body material 1A shown in FIG. It is a side view which shows the solid end mill with a coolant hole which is the 2nd Embodiment of this invention. It is a sectional side view of the end mill main body raw material of embodiment shown in FIG.
- FIGS. 1 to 7 show a first embodiment of the present invention.
- This first embodiment is an application of the present invention to a cutting head of a head replaceable end mill with a coolant hole.
- This cutting head includes a head body 1 as a tool body in the present embodiment integrally formed of a hard material such as cemented carbide, cermet, ceramics, etc., and stainless steel having a hardness lower than that of the hard material forming the head body 1. It comprises a connecting member 2 made of a plastically deformable metal material such as a steel material such as steel or die steel, and a cylindrical member 3 as switching means in the present embodiment.
- Such a cutting head is attached to the tip of a cylindrical shaft-shaped holder 4 as shown in FIG.
- the head body 1 includes a blade portion 11 on which cutting edges are formed in order from the front end side (left side in FIG. 2B) to the rear end side (right side in FIG. 2B).
- the engaging portion 12 with which a wrench or the like is engaged when exchanging the cutting head, and the outer diameter of the engaging portion 12 are smaller than those of the blade portion 11 and the engaging portion 12, and the outer diameter gradually increases toward the rear end side.
- a truncated cone-shaped tapered shaft portion 13 centering on the axis O that is made smaller is formed.
- the inclination angle formed by the outer peripheral surface of the taper shaft portion 13 with respect to the axis O is preferably in the range of 1 ° to 20 °, more preferably in the range of 1 ° to 5 °, and still more preferably. It is set within a range of 1 ° to 3 °, and in this embodiment, 2 °.
- a plurality of chip discharge grooves 14 twisted toward the rear side in the end mill rotation direction T around the axis O from the front end to the rear end side of the head body 1 at equal intervals in the circumferential direction (this embodiment) In the form, four strips) are formed, and an outer peripheral edge 15a is formed as the cutting edge on the outer peripheral side ridge portion of the chip discharge groove 14, and a bottom blade 15b is also formed as a cutting edge on the distal end side ridge portion.
- the head replaceable end mill of the present embodiment is a radius end mill, and a corner blade 15c having a convex curve shape such as a quarter arc is formed at a corner portion where the outer peripheral blade 15a and the bottom blade 15b intersect. Has been.
- FIG. 5 shows a head body material 1A that is a material of the head body 1 before the chip discharge groove 14, the outer peripheral edge 15a, the bottom edge 15b, and the corner edge 15c are formed.
- the head body material 1 ⁇ / b> A has a connecting member mounting hole 16 that opens to the rear end surface of the tapered shaft portion 13 and extends to the front end side, and further to the front end side of the connecting member mounting hole 16.
- a bottomed cylindrical member mounting hole 17 communicating with the connecting member mounting hole 16 and having a diameter smaller than that of the connecting member mounting hole 16 is formed along the axis O.
- the connecting member mounting hole 16 and the cylindrical member mounting hole 17 As a result, a coolant hole is formed. Therefore, in this embodiment, the axis of the coolant hole is coaxial with the axis O that is the center of the head body 1.
- a plurality of branch holes 18 having a smaller diameter than the cylindrical member mounting hole 17 are formed from the cylindrical member mounting hole 17.
- annular groove 16 a that has a cross-section along the axis O that forms a concave curve such as an arc and circulates around the axis O is formed on the inner peripheral surface of the connecting member mounting hole 16 with the rear end surface of the tapered shaft portion 13.
- a plurality of strips (three strips in this embodiment) are formed at intervals from the boundary portion between the connecting member mounting hole 16 and the cylindrical member mounting hole 17.
- annular groove 17a that also has a concave curved cross-sectional shape and circulates around the axis O on the inner peripheral surface of the cylindrical member mounting hole 17 is formed between the boundary portion with the connecting member mounting hole 16 and the opening portion of the branch hole 18.
- One strip is formed with a gap between them.
- the plurality of branch holes 18 extend to the outer peripheral side from the inner peripheral surface of the cylindrical member mounting hole 17 toward the distal end side and open to the outer peripheral surface of the head main body material 1A, and a cylindrical shape.
- a bottom blade branch hole 18b that extends to the outer peripheral side from the bottom surface of the member mounting hole 17 toward the front end side and opens at the front end surface of the head main body material 1A is formed.
- the four outer peripheral edge branch holes 18a and the lower edge branch holes 18b are branched at equal intervals in the circumferential direction and alternately spaced apart from each other in the circumferential direction. It is formed to do.
- the bottom blade branch hole 18b has a slightly smaller diameter than the outer blade branch hole 18a.
- FIG. 6 shows a cylindrical member material 3A as a material of the cylindrical member 3 mounted in the cylindrical member mounting hole 17, and this cylindrical member material 3A is similar to the connecting member 2 in the head main body.
- 1 is formed of a metal material that can be plastically deformed, such as a steel material such as stainless steel or die steel having a lower hardness than the above-described hard material, and has a substantially bottomed cylindrical shape.
- the bottom of the cylindrical member material 3A having a bottom is parallel to the axis O at a position where the radius from the axis O is equal to the opening at the bottom surface of the cylindrical member mounting hole 17 of the bottom blade branch hole 18b.
- the same number of bottom blade side through holes 31 extending through the bottom portion as the bottom blade branch holes 18b are formed at equal intervals in the circumferential direction.
- the shortest distance between the inner peripheral surfaces of the two bottom blade side through holes 31 adjacent in the circumferential direction around the axis O is the circumference of the opening of the bottom blade branch hole 18b on the bottom surface of the cylindrical member mounting hole 17.
- the shortest distance between the openings on the bottom surface of the cylindrical member mounting hole 17 of the two bottom blade branch holes 18b that are also adjacent to each other in the circumferential direction around the axis O is the circumference of the bottom blade side through hole 31. It is made larger than the width in the direction, that is, the inner diameter.
- the position of the cylindrical member material 3A in the direction of the axis O is also branched at the outer peripheral edge of the cylindrical member material 3A in a state where the bottom end surface of the cylindrical member material 3A is in contact with the bottom surface of the cylindrical member mounting hole 17.
- the outer peripheral blade side through holes 32 penetrating the cylindrical wall portion perpendicularly to the axis O are formed in the same number as the outer peripheral blade branch hole 18a at equal intervals in the circumferential direction.
- the outer peripheral blade side through hole 32 and the bottom blade side through hole 31 are formed so as to be slightly shifted in the circumferential direction in the present embodiment, and the shift amount, that is, the outer peripheral blade side adjacent in the circumferential direction.
- the angles formed by the straight lines connecting the centers of the through hole 32 and the bottom blade side through hole 31 and the axis O when viewed in the direction of the axis O are the outer peripheral blade branch hole 18a and the outer blade side through hole 32 and the bottom as in this embodiment.
- the outer peripheral blade branch holes 18a and the outer blade side through holes 32 are aligned in the circumferential direction.
- the inner peripheral surface of the cylindrical member material 3A has a circular shape in the most part on the rear end side, whereas the tip side (bottom side) has a cross section perpendicular to the axis O in FIG. )
- the cross-section is a regular hexagonal shape that is substantially inscribed in a circle formed by the rear end side portion, and is an engagement hole portion 33 that can be engaged with a hexagonal bar wrench.
- the hole 31 is formed so as to partially open in the engagement hole 33.
- the length of the cylindrical member material 3A in the direction of the axis O is slightly shorter than the length (depth) of the cylindrical member mounting hole 17, provided that the bottom end surface of the cylindrical member material 3A is attached to the cylindrical member.
- the cylindrical wall portion of the cylindrical member material 3 ⁇ / b> A extends to the rear end side with respect to the annular groove 17 a of the cylindrical member mounting hole 17 in a state where it is in contact with the bottom surface of the hole 17.
- the outer diameter of the cylindrical member material 3A is made, for example, about 0.2 mm smaller than the inner diameter of the cylindrical member mounting hole 17 in the head main body material 1A.
- the cylindrical member material 3A is attached as the cylindrical member 3 that is slidably contacted with the inner peripheral surface of the cylindrical member mounting hole 17 (coolant hole) and rotatably accommodated.
- a head H having an outer diameter slightly larger than the inner diameter is formed on the inner peripheral portion of the cylindrical member material 3A.
- the shaft-shaped punch P is driven from the rear end side and is press-fitted to the front of the engagement hole 33, so that the cylindrical wall portion of the cylindrical member material 3A is plastically deformed and expanded in diameter.
- the cylindrical member 3 plastically deformed in this manner is in a substantially liquid-tight sliding contact with the outer peripheral surface of the rear end side portion into which the punch P is inserted in close contact with the inner peripheral surface of the cylindrical member mounting hole 17. While being rotatable around the axis O, the outer peripheral surface that is plastically deformed also enters the annular groove 17a formed in the cylindrical member mounting hole 17, and engages with the annular groove 17a. Movement is restrained and it is prevented from coming off. Note that the inner diameter of the inner peripheral portion of the cylindrical member 3 that has been expanded in diameter by the press-fitting of the punch P is such that the hexagonal bar wrench can be inserted therethrough.
- the shortest distance between the inner surfaces of the two outer peripheral blade side through holes 32 adjacent to each other in the circumferential direction around the axis O is the outer periphery of the inner peripheral surface of the cylindrical member mounting hole 17.
- the shortest distance between the openings on the inner peripheral surface of the cylindrical member mounting hole 17 of the two outer peripheral blade branch holes 18a which is made larger than the circumferential width of the opening of the blade branch hole 18a and is also adjacent in the circumferential direction around the axis O.
- the interval is made larger than the circumferential width of the outer peripheral blade side through hole 32 of the cylindrical member 3.
- the connecting member 2 is attached to the connecting member mounting hole 16.
- the connecting member 2 is also cylindrical. Similar to the shaped member 3, a connecting member material (not shown) formed of a metal material as described above is plastically deformed and expanded in diameter to be attached to the connecting member mounting hole 16.
- the connecting member material has a front end portion that is cylindrical with an outer diameter slightly smaller than the inner diameter of the connecting member mounting hole 16, and a rear end side portion that is larger than the inner diameter of the connecting member mounting hole 16.
- a male screw portion 21 having an outer diameter smaller than the outer diameter of the rear end surface of the taper shaft portion 13 of the head body 1 is formed, and the inner peripheral portion of the tip side portion is extended to the male screw portion 21 to be a connecting member. It penetrates the material.
- the inner diameter of the inner peripheral portion of the male screw portion 21 is slightly larger than that of the tip end portion so as not to be plastically deformed.
- the length of the tip side portion in the direction of the axis O is slightly shorter than the length (depth) of the connecting member mounting hole 16, except that the tip surface of the male screw portion 21 is formed on the taper shaft portion 13 of the head body material 1A. In a state of being in contact with the rear end surface, the tip end portion extends to the tip end side from the annular groove 16 a on the tip end side of the connecting member mounting hole 16.
- connection member raw material comprised in this way into the connection member attachment hole 16
- it is a male screw with the outer diameter larger than the internal diameter of the front end side part in the inner peripheral part of this connection member raw material.
- a shaft-shaped punch having a head having an outer diameter smaller than the inner diameter of the portion 21 is driven from the rear end side, and press-fitted into the connecting member mounting hole 16 to a position exceeding at least the annular groove 16a on the front end side.
- the distal end portion of the member material is plastically deformed to expand its diameter, and is attached to the connecting member mounting hole 16 as the connecting member 2.
- the distal end side portion of the connecting member 2 thus expanded in diameter has an outer peripheral surface that is in close contact with the inner peripheral surface of the connecting member mounting hole 16 and is also plastically deformed in the annular groove 16a, like the cylindrical member 3.
- the surfaces enter and engage, and the connecting member 2 is prevented from coming off in the direction of the axis O.
- the connecting member 2 does not rotate around the axis O with respect to the head body 1, and the outer peripheral surface of the tip side portion is firmly in close contact with the inner peripheral surface of the connecting member mounting hole 16.
- the inner / outer diameter difference between the tip end portion and the inner / outer diameter difference between the inner peripheral portion of the connecting member material and the punch head. 3 and 4 the inner diameter of the tip side portion thus plastically deformed is made equal to the inner diameter of the male screw portion 21, and the inner diameter is set such that the above hexagonal bar wrench can be inserted.
- the cemented carbide or the like that forms the head body 1 without polishing or the like on its inner peripheral surface is used instead of or in addition to forming the annular groove 16a in the connecting member mounting hole 16.
- Surface roughness within the range of 5 ⁇ m to 200 ⁇ m with the maximum height roughness Rz specified in JIS B 0601: 2001 (ISO 4287: 1997), for example, as the sintered skin when the powder sintered material is sintered.
- the chip discharge groove 14 On the head body material 1A to which the connecting member 2 and the cylindrical member 3 (switching means) are attached, the chip discharge groove 14, the outer peripheral blade 15a, the bottom blade 15b, the corner blade 15c, and the engaging portion 12 are provided.
- the outer peripheral blade branch hole 18a is opened to the groove bottom of the chip discharge groove 14 so as to supply coolant toward the outer peripheral blade 15a.
- the blade branch hole 18b is opened at a tip flank that continues to the rear of the bottom blade 15b in the end mill rotation direction T so as to supply coolant to the bottom blade 15b.
- the male threaded portion of the connecting member 2 is screwed into the female threaded portion provided in the holder 4, whereby the head body 1.
- the taper shaft portion 13 is attached to the tip end portion of the cylindrical shaft holder 4 in close contact with the taper hole portion of the holder 4 as described above.
- the coolant supplied from the machine tool side through the inner peripheral portion of the holder 4 is connected to the connection member 2 and the cylindrical member 3 attached to the connection member attachment hole 16 and the cylindrical member attachment hole 17 which are coolant holes.
- the bottom blade branch hole 18b or the outer blade branch hole 18a is supplied from the bottom blade side through hole 31 or the outer blade side through hole 32 of the cylindrical member 3 which is supplied to the tip of the head body 1 through the peripheral portion and is a switching means. Erupted through.
- the position of the inner opening in the circumferential direction is 360 ° from the outer circumferential edge branch hole 18a and the bottom edge branch hole.
- the hexagonal bar is passed through the inner peripheral portion of the connecting member 2 and the cylindrical member 3 before attaching the cutting head to the holder 4.
- a wrench is inserted and engaged with the engagement hole 33, and the rotation position of the cylindrical member 3 as the switching means is set so that the coolant is supplied toward one of the cutting blades to be used.
- the switching means for selecting the branch hole 18 for supplying the coolant is the cylindrical member 3 that is slidable in contact with the inner peripheral surface of the cylindrical member mounting hole 17 that is the coolant hole and is rotatable.
- the cylindrical member 3 is shifted in the circumferential direction of the cylindrical member mounting hole 17 and branched into the branch hole 18 which is branched to the outer peripheral blade side or bottom.
- One of the through holes 31 and 32 on the blade side is made to coincide so that the coolant is supplied to the cutting blade to be used.
- the cylindrical member 3 is a cylindrical member in which a cylindrical member material 3A formed of a metal material having a hardness lower than that of the head body 1 made of a hard material is plastically deformed, and an outer peripheral surface thereof is a coolant hole. Since it is in close contact with the inner peripheral surface of the mounting hole 17 and is engaged with the annular groove 17a, it can be slidably contacted with the inner peripheral surface and can be rotated. Therefore, the outer peripheral surface is engaged with the annular groove 17a. The cylindrical member 3 can be rotated while preventing the cylindrical member 3 from coming out of the cylindrical member mounting hole 17, and due to the close contact between the inner and outer peripheral surfaces, the coolant leaks from the gap and is supplied to a cutting blade that is not used for cutting. It is possible to prevent the cylindrical member 3 from rotating during the cutting process.
- the head main body 1 in which the chip discharge groove 14, the outer peripheral blade 15a, the bottom blade 15b, and the corner blade 15c are formed is not required. Therefore, for example, the head main body 1 in which the chip discharge groove 14, the outer peripheral blade 15a, the bottom blade 15b, and the corner blade 15c are formed. Even when the surface of the blade portion 11 is coated with various coating films, even if the head main body 1 becomes hot, it is possible to reliably prevent the coolant leakage as described above.
- the present invention is applied to an end mill in which an outer peripheral blade 15a and a bottom blade 15b are formed on a blade portion 11 of a cutting tool, and the cutting in the direction of the axis O is small and only the bottom blade 15b is exclusively used.
- the plurality of branch holes 18 are divided into the outer peripheral edge branch holes 18a and the bottom edge branch as described above.
- the holes 18b it is possible to selectively supply coolant between the outer peripheral blade branch holes 18a and the bottom blade branch holes 18b reliably and easily, especially by the rotation of the cylindrical member 3 as the switching means. It becomes.
- the present invention is applied to such a head replaceable end mill.
- the head replaceable type is used.
- the present invention can also be applied to general solid end mills that are not.
- symbol is distribute
- the entire end mill body 41 having a substantially cylindrical shape centering on the axis O is formed of the hard material such as cemented carbide, and the chip discharge groove 14 and the outer peripheral blade 15a, Like the end mill main body material 42 of the end mill main body 41 shown in FIG. 9 before the bottom blade 15b and the corner blade 15c are formed, a coolant hole 43 is formed along the axis O from the rear end toward the front end. The tip of the coolant hole 43 is a cylindrical member mounting hole 17.
- the cylindrical member 3 as a switching means similar to that of the first embodiment is attached to the cylindrical member attachment hole 17 so as to be rotatable and prevented from being detached, and the outer peripheral edge branches from the cylindrical member attachment hole 17.
- the hole 18a and the bottom blade branch hole 18b are branched as a branch hole 18, and as shown in FIG. 8, on the tip flank that continues to the groove bottom of the chip discharge groove 14 and the end mill rotation direction T rear side of the bottom blade 15b.
- the coolant that is opened and selectively supplied can be supplied to the outer peripheral blade 15a or the bottom blade 15b.
- the rear end mill body 41 has a rear end.
- the coolant is supplied to one of the used cutting blades and the supply to the other cutting blade is stopped. It is possible to prevent the waste of coolant and the decrease in supply pressure.
- the case where the present invention is applied to a head exchange type or a solid radius end mill has been described.
- other types of end mills such as a ball end mill and a square end mill, and other end mills may be used.
- the plurality of branch holes 18 are selected by the switching means so that the coolant is supplied only to one of the outer peripheral edge 15a and the bottom edge 15b of the end mill.
- a plurality of through holes 32 are formed so as to communicate with both the outer peripheral blade branch hole 18a and the bottom blade branch hole 18b, or the outer periphery is used for dry cutting. You may make it provide the rotational position of the cylindrical member 3 in which the through-hole 32 does not communicate with any of the blade branch hole 18a and the bottom blade branch hole 18b.
- the outer peripheral blade branch hole 18a and the bottom blade branch hole 18b which are the plurality of branch holes 18, are shifted in the direction of the axis O on the inner surface of the cylindrical member mounting hole 17 which is a coolant hole. It is branched so as to open, and is also branched so as to be shifted in the circumferential direction.
- a cutting tool such as an end mill having a twisted outer peripheral edge 15a, at any position in the axis O direction.
- the outer peripheral blade branch hole 18a and the bottom blade branch hole 18b may be branched at the same position in the circumferential direction. .
- the peripheral blade branch hole 18a and the bottom blade branch hole 18b are set as a plurality of branch holes 18, and not only the coolant supply is selected by the switching means, but also, for example, a plurality of branches branched in the direction of the axis O of the coolant hole.
- the branch hole for supplying coolant by the switching means is selected between the outer peripheral blade branch holes 18a, or the bottom blade branch hole 18b and the bottom blade 15b are opened from the bottom surface of the coolant hole to the tip clearance surface of the bottom blade 15b.
- the bottom blade branch holes that are open in the circumferential direction may be formed so as to be shifted in the circumferential direction, and a branch hole that supplies coolant between these bottom blade branch holes may be selected.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Auxiliary Devices For Machine Tools (AREA)
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- Cutting Tools, Boring Holders, And Turrets (AREA)
- Milling Processes (AREA)
Abstract
Provided is a cutting tool with a coolant hole, which has different cutting blades such as an outer circumferential blade and a bottom blade and in which a coolant hole having a plurality of branch holes corresponding to the different cutting blades is formed and even when one of the cutting blades is solely used, coolant is not uselessly used and supply pressure is not required more than necessary.
A coolant hole (17) is formed in a tool main body and branched into a plurality of branch holes (18a, 18b) in a blade portion (11) of the tool main body. In addition, the coolant hole (17) is equipped with a switching means (3) that makes it possible to select, among the branch holes (18a, 18b), a branch hole (18) for supplying coolant.
Description
本発明は、工具本体の刃部に冷却、潤滑用のクーラントを供給するクーラント穴が形成されたクーラント穴付き切削工具に関するものである。
The present invention relates to a cutting tool with a coolant hole in which a coolant hole for supplying coolant for cooling and lubrication is formed on a blade portion of a tool body.
このようなクーラント穴付き切削工具として、特許文献1には、一端に切削油(クーラント)供給口を形成し他端にはエンドミルの刃先中央(底刃中央)に開口する中心軸方向に穿設された中空の軸管と、エンドミル軸内において該軸管と連通し、かつ端部がエンドミル外部の外周刃の刃溝部に開口する中空切削油噴出口を設けたクーラント穴付きエンドミルが提案されている。
As such a cutting tool with a coolant hole, in Patent Document 1, a cutting oil (coolant) supply port is formed at one end, and the other end is drilled in the direction of the central axis that opens to the center of the edge of the end mill (bottom blade center). An end mill with a coolant hole is proposed which is provided with a hollow shaft oil pipe and a hollow cutting oil jet port which communicates with the shaft pipe in the end mill shaft and has an end opening in the groove of the outer peripheral blade outside the end mill. Yes.
また、特許文献2にも、同様にエンドミルの先端中央に開口する軸方向クーラント穴と、この軸方向クーラント穴から分岐して外周刃の刃溝に開口する分岐穴とを備え、外周刃による側面切削のときには軸方向クーラント穴の先端をプラグで塞ぐとともに、底刃による正面切削の際にはプラグを外すようにしたクーラント穴付きエンドミルが提案されている。
Similarly, Patent Document 2 includes an axial coolant hole that opens to the center of the tip of the end mill, and a branch hole that branches from the axial coolant hole and opens into the blade groove of the outer peripheral blade. An end mill with a coolant hole has been proposed in which the end of the axial coolant hole is closed with a plug during cutting, and the plug is removed during front cutting with a bottom blade.
しかしながら、このうち特許文献1に記載されたクーラント穴付きエンドミルでは、エンドミルの外周刃のみを使用する側面切削の場合も、エンドミルの刃先中央に開口した軸管からクーラントが噴出させられることになる一方、専らエンドミル先端の底刃のみを使用するような切込み深さの浅い溝切削の場合も、外周刃の刃溝部に開口する噴出口からクーラントが噴出することになるため、いずれの場合もクーラントが無駄に消費されることになるのは勿論、切削に使用される切刃に向けてクーラントを供給するにも必要以上の供給圧でクーラントを供給しなければならず、クーラントを供給する工作機械の供給手段等にも余計な負担を強いることになる。
However, among these end mills with coolant holes described in Patent Document 1, even in the case of side cutting using only the outer peripheral edge of the end mill, the coolant is ejected from the shaft tube opened at the center of the end mill edge. Even in the case of groove cutting with a shallow cutting depth that uses only the bottom blade at the end of the end mill, the coolant will be ejected from the outlet opening in the edge groove of the outer peripheral blade. Of course, it is consumed wastefully, and coolant must be supplied at a supply pressure higher than necessary to supply coolant toward the cutting blade used for cutting. An extra burden will be imposed on the supply means.
この点、側面切削のときには軸方向クーラント穴の先端をプラグで塞ぐようにした特許文献2に記載のクーラント穴付きエンドミルでは、この側面切削の場合にはクーラントが無駄に消費されたり必要以上のクーラント供給圧を要したりすることはないが、専ら底刃のみを使用する溝切削のような場合は、切削に使用されない外周刃の刃溝に開口する分岐穴からもクーラントが噴出し続けるため、やはりクーラントが無駄に消費されるとともに必要以上の供給圧でクーラントを供給しなければならない。
In this respect, in the end mill with a coolant hole described in Patent Document 2 in which the tip of the axial coolant hole is closed with a plug during side cutting, the coolant is wasted in this side cutting or more coolant than necessary. It does not require supply pressure, but in the case of groove cutting that uses only the bottom blade exclusively, coolant continues to be ejected from the branch hole that opens to the blade groove of the outer peripheral blade that is not used for cutting. Again, the coolant is wasted and the coolant must be supplied at a supply pressure higher than necessary.
本発明は、このような背景の下になされたもので、上述のようにエンドミル先端の底刃に向けた分岐穴とエンドミル外周の外周刃に向けた分岐穴とを有するエンドミルのような複数の分岐穴を有するクーラント穴が形成されたクーラント穴付き切削工具において、いずれか一方の切刃を専ら使用するときでもクーラントが無駄に消費されたり必要以上の供給圧を要したりすることのないクーラント穴付き切削工具を提供することを目的としている。
The present invention has been made under such a background, and as described above, a plurality of end mills such as an end mill having a branch hole toward the bottom blade at the end mill tip and a branch hole toward the outer peripheral blade at the outer periphery of the end mill as described above. In coolant tool with coolant hole with branch hole formed, coolant that does not waste coolant or require excessive supply pressure even when only one of the cutting edges is used It aims to provide a cutting tool with a hole.
上記課題を解決して、このような目的を達成するために、本発明は、工具本体にクーラント穴が形成されていて、このクーラント穴は上記工具本体の刃部において複数の分岐穴に分岐させられているとともに、該クーラント穴には上記複数の分岐穴の間でクーラントを供給する分岐穴を選択可能とする切替手段が備えられていることを特徴とする。
In order to solve the above problems and achieve such an object, according to the present invention, a coolant hole is formed in the tool body, and the coolant hole is branched into a plurality of branch holes in the blade portion of the tool body. In addition, the coolant hole is provided with switching means for selecting a branch hole for supplying the coolant among the plurality of branch holes.
従って、このようなクーラント穴付き切削工具においては、上記複数の分岐穴が上述のように異なる切刃に向けて開口させられている場合に、いずれか一方の切刃を専ら使用するときは、使用する切刃に向けて開口する分岐穴にクーラントが供給されるように上記切替手段によって分岐穴を選択することにより、他方の分岐穴へのクーラントの供給を止めて、無駄にクーラントが消費されたり必要以上のクーラント供給圧を要したりするのを防ぐことができる。
Therefore, in such a cutting tool with a coolant hole, when the plurality of branch holes are opened toward different cutting edges as described above, when using only one of the cutting edges, By selecting the branch hole by the switching means so that the coolant is supplied to the branch hole that opens toward the cutting blade to be used, the coolant supply to the other branch hole is stopped and the coolant is wasted. It is possible to prevent excessive coolant supply pressure from being required.
ここで、このような切替手段として、例えば特許文献2に記載のクーラント穴付き切削工具のように分岐穴をプラグで塞ぐようにしたのでは、分岐穴の数が多いときに切替操作に多くの時間を要するとともにプラグの管理等も煩雑となる。そこで、これら複数の分岐穴を、クーラント穴の周方向と軸線方向のうち少なくとも一方にずらして分岐するとともに、上記切替手段を、クーラント穴の内周面に摺接して回転可能に収容された円筒状部材とし、この円筒状部材に複数の貫通穴を形成して、これら複数の貫通穴を互いに、一部の貫通穴が上記複数の分岐穴のうち一部の分岐穴に連通したときに、残りの貫通穴は残りの分岐穴とはずらされるように形成することにより、この円筒状部材の回転操作だけで容易かつ短時間に分岐穴の切り替えが可能となる。
Here, as such a switching means, for example, when the branch hole is plugged with a plug like the cutting tool with a coolant hole described in Patent Document 2, when the number of branch holes is large, many switching operations are performed. It takes time and the management of the plug becomes complicated. Accordingly, the plurality of branch holes are branched while being shifted in at least one of the circumferential direction and the axial direction of the coolant hole, and the switching means is slidably contacted with the inner peripheral surface of the coolant hole and rotatably accommodated therein. When a plurality of through holes are formed in the cylindrical member and the plurality of through holes communicate with each other, some of the through holes communicate with some of the plurality of branch holes. By forming the remaining through holes so as to be offset from the remaining branch holes, the branch holes can be switched easily and in a short time only by rotating the cylindrical member.
ここで、このような円筒状部材よりなる切替手段を上述のようにクーラント穴の内周面に摺接して回転可能に収容するには、上記工具本体を硬質材料より形成するとともに、上記円筒状部材は上記硬質材料よりも硬度が低い金属材料より形成し、上記クーラント穴の内周面には環状溝を形成して、上記円筒状部材を、その外周面が上記クーラント穴の内周面に密着して上記環状溝と係合させることにより該内周面に摺接して回転可能とすればよい。円筒状部材の外周面がクーラント穴内周面の環状溝と係合することにより、円筒状部材の回転は許容しつつその軸線方向の移動は拘束して抜け止めすることができるため管理が容易となるとともに、この環状溝以外ではクーラント穴内周面に円筒状部材外周面が摺接可能に密着することにより、クーラントの漏れを防止することができる。
Here, in order to rotatably accommodate the switching means made of such a cylindrical member in sliding contact with the inner peripheral surface of the coolant hole as described above, the tool body is formed of a hard material and the cylindrical shape is formed. The member is made of a metal material whose hardness is lower than that of the hard material, an annular groove is formed on the inner peripheral surface of the coolant hole, and the outer peripheral surface of the cylindrical member is formed on the inner peripheral surface of the coolant hole. What is necessary is just to be able to rotate in contact with this internal peripheral surface by closely_contact | adhering and engaging with the said annular groove. Since the outer peripheral surface of the cylindrical member is engaged with the annular groove on the inner peripheral surface of the coolant hole, the cylindrical member is allowed to rotate and the movement in the axial direction can be restrained and prevented from coming off. In addition to this annular groove, the outer circumferential surface of the cylindrical member is in close contact with the inner circumferential surface of the coolant hole so as to be slidable, thereby preventing leakage of the coolant.
特に、本発明は、上記特許文献1、2に記載の発明と同様にクーラント穴付きエンドミルに適用して好適であり、すなわち上記工具本体が、上記刃部に底刃と外周刃とを有するエンドミルの該刃部が形成された工具本体であり、上記複数の分岐穴が上記底刃と外周刃とに上記クーラントを供給するようにそれぞれ開口させられている場合において、上記切替手段を、上記底刃に上記クーラントを供給する底刃分岐穴と上記外周刃に上記クーラントを供給する外周刃分岐穴との間でクーラントを供給する分岐穴を選択可能とすることにより、これら底刃と外周刃のいずれか一方の切刃を専ら使用するときでもクーラントが無駄に消費されたり必要以上の供給圧を要したりするのを確実に防ぐことができる。
In particular, the present invention is suitable for application to an end mill with a coolant hole as in the inventions described in Patent Documents 1 and 2, that is, an end mill in which the tool body has a bottom blade and an outer peripheral blade on the blade portion. A tool body in which the blade portion is formed, and when the plurality of branch holes are respectively opened to supply the coolant to the bottom blade and the outer peripheral blade, the switching means is By making it possible to select a branch hole for supplying coolant between a bottom blade branch hole for supplying the coolant to the blade and an outer blade branch hole for supplying the coolant to the outer peripheral blade, the bottom blade and the outer blade can be selected. Even when only one of the cutting blades is used, it is possible to reliably prevent the coolant from being consumed wastefully or requiring an excessive supply pressure.
以上説明したように、本発明によれば、使用されない切刃に向けてのクーラントの供給を止めてクーラントの無駄な消費を防ぐとともにクーラントの供給圧の低減を図ることができ、効率的で経済的な切削加工を促すことが可能となる。
As described above, according to the present invention, it is possible to stop the supply of the coolant toward the cutting blade that is not used to prevent wasteful consumption of the coolant and to reduce the supply pressure of the coolant. It is possible to promote efficient cutting.
1 ヘッド本体(工具本体)
1A ヘッド本体素材
2 連結部材
3 円筒状部材(切替手段)
3A 円筒状部材素材
4 ホルダ
11 刃部
12 係合部
13 テーパ軸部
15a 外周刃
15b 底刃
16 連結部材取付穴(クーラント穴)
16a、17a 環状溝
17 円筒状部材取付穴(クーラント穴)
18 分岐穴
18a 外周刃分岐穴
18b 底刃分岐穴
21 雄ねじ部
31 底刃側貫通穴
32 外周刃側貫通穴
33 係合穴部
41 エンドミル本体(工具本体)
42 エンドミル本体素材
43 クーラント穴
O ヘッド本体1、エンドミル本体41の軸線
T エンドミル回転方向 1 Head body (tool body)
1AHead body material 2 Connecting member 3 Cylindrical member (switching means)
3ACylindrical member material 4 Holder 11 Blade portion 12 Engagement portion 13 Tapered shaft portion 15a Peripheral blade 15b Bottom blade 16 Connecting member mounting hole (coolant hole)
16a, 17aannular groove 17 cylindrical member mounting hole (coolant hole)
18branch hole 18a outer peripheral blade branch hole 18b bottom blade branch hole 21 male screw part 31 bottom blade side through hole 32 outer peripheral blade side through hole 33 engagement hole part 41 end mill main body (tool main body)
42 End mill body material 43 Coolant hole O Axis ofhead body 1 and end mill body 41 T End mill rotation direction
1A ヘッド本体素材
2 連結部材
3 円筒状部材(切替手段)
3A 円筒状部材素材
4 ホルダ
11 刃部
12 係合部
13 テーパ軸部
15a 外周刃
15b 底刃
16 連結部材取付穴(クーラント穴)
16a、17a 環状溝
17 円筒状部材取付穴(クーラント穴)
18 分岐穴
18a 外周刃分岐穴
18b 底刃分岐穴
21 雄ねじ部
31 底刃側貫通穴
32 外周刃側貫通穴
33 係合穴部
41 エンドミル本体(工具本体)
42 エンドミル本体素材
43 クーラント穴
O ヘッド本体1、エンドミル本体41の軸線
T エンドミル回転方向 1 Head body (tool body)
1A
3A
16a, 17a
18
42 End mill body material 43 Coolant hole O Axis of
図1ないし図7は、本発明の第1の実施形態を示すものであって、この第1の実施形態は、本発明をクーラント穴付きのヘッド交換式エンドミルの切削ヘッドに適用したものである。この切削ヘッドは、超硬合金やサーメット、セラミックス等の硬質材料により一体形成された本実施形態における工具本体としてのヘッド本体1と、このヘッド本体1を形成する上記硬質材料よりも硬度が低いステンレス鋼やダイス鋼等の鋼材のような塑性変形可能な金属材料よりなる連結部材2と、本実施形態における切替手段としての円筒状部材3とから構成されている。このような切削ヘッドは、上記連結部材2を介して図1に示すように円筒軸状のホルダ4の先端部に取り付けられ、このホルダ4が工作機械の主軸に取り付けられてヘッド本体1の中心軸線O回りにエンドミル回転方向Tに回転されつつ該軸線Oに交差する方向に送り出されることにより、被削材に切削加工を施してゆく。
FIGS. 1 to 7 show a first embodiment of the present invention. This first embodiment is an application of the present invention to a cutting head of a head replaceable end mill with a coolant hole. . This cutting head includes a head body 1 as a tool body in the present embodiment integrally formed of a hard material such as cemented carbide, cermet, ceramics, etc., and stainless steel having a hardness lower than that of the hard material forming the head body 1. It comprises a connecting member 2 made of a plastically deformable metal material such as a steel material such as steel or die steel, and a cylindrical member 3 as switching means in the present embodiment. Such a cutting head is attached to the tip of a cylindrical shaft-shaped holder 4 as shown in FIG. 1 via the connecting member 2, and this holder 4 is attached to the main shaft of the machine tool to be the center of the head body 1. The workpiece is cut by being fed in a direction intersecting the axis O while being rotated in the end mill rotation direction T around the axis O.
ヘッド本体1は、図2に示すように先端側(図2(b)において左側)から後端側(図2(b)において右側)に向けて順に、切刃が形成される刃部11と、切削ヘッドの交換の際にレンチ等が係合させられる係合部12と、これら刃部11および係合部12よりも外径が一段小さく、しかもこの外径が後端側に向かうに従い漸次小さくなるようにされた軸線Oを中心とする円錐台状のテーパ軸部13が形成されている。なお、このテーパ軸部13の外周面が軸線Oに対してなす傾斜角度は1°~20°の範囲内とされるのが望ましく、より望ましくは1°~5°の範囲内、さらに望ましくは1°~3°の範囲内とされて、本実施形態では2°とされている。
As shown in FIG. 2, the head body 1 includes a blade portion 11 on which cutting edges are formed in order from the front end side (left side in FIG. 2B) to the rear end side (right side in FIG. 2B). The engaging portion 12 with which a wrench or the like is engaged when exchanging the cutting head, and the outer diameter of the engaging portion 12 are smaller than those of the blade portion 11 and the engaging portion 12, and the outer diameter gradually increases toward the rear end side. A truncated cone-shaped tapered shaft portion 13 centering on the axis O that is made smaller is formed. The inclination angle formed by the outer peripheral surface of the taper shaft portion 13 with respect to the axis O is preferably in the range of 1 ° to 20 °, more preferably in the range of 1 ° to 5 °, and still more preferably. It is set within a range of 1 ° to 3 °, and in this embodiment, 2 °.
刃部11の外周には、ヘッド本体1の先端から後端側に向けて軸線O回りにエンドミル回転方向Tの後方側に捩れる切屑排出溝14が周方向に等間隔に複数条(本実施形態では4条)形成され、これらの切屑排出溝14の外周側辺稜部には上記切刃として外周刃15aが、また先端側辺稜部には同じく切刃として底刃15bが形成されている。なお、本実施形態のヘッド交換式エンドミルはラジアスエンドミルであって、これら外周刃15aと底刃15bとが交差するコーナ部には、1/4円弧等の凸曲線状をなすコーナ刃15cが形成されている。
On the outer periphery of the blade portion 11, a plurality of chip discharge grooves 14 twisted toward the rear side in the end mill rotation direction T around the axis O from the front end to the rear end side of the head body 1 at equal intervals in the circumferential direction (this embodiment) In the form, four strips) are formed, and an outer peripheral edge 15a is formed as the cutting edge on the outer peripheral side ridge portion of the chip discharge groove 14, and a bottom blade 15b is also formed as a cutting edge on the distal end side ridge portion. Yes. The head replaceable end mill of the present embodiment is a radius end mill, and a corner blade 15c having a convex curve shape such as a quarter arc is formed at a corner portion where the outer peripheral blade 15a and the bottom blade 15b intersect. Has been.
図5は、このような切屑排出溝14や外周刃15a、底刃15b、およびコーナ刃15cが形成される前のヘッド本体1の素材となるヘッド本体素材1Aを示すものであり、上記硬質材料の焼結等によって製造されたこのようなヘッド本体素材1Aに、上記連結部材2と図6に示す円筒状部材3とが図2、図3および図7に示すように取り付けられた上で、刃部11の切屑排出溝14や外周刃15a、底刃15b、およびコーナ刃15cと、上記係合部12とが形成されてヘッド本体1に製造される。
FIG. 5 shows a head body material 1A that is a material of the head body 1 before the chip discharge groove 14, the outer peripheral edge 15a, the bottom edge 15b, and the corner edge 15c are formed. After connecting the connecting member 2 and the cylindrical member 3 shown in FIG. 6 to the head body material 1A manufactured by sintering or the like, as shown in FIGS. 2, 3 and 7, The chip discharge groove 14, the outer peripheral blade 15 a, the bottom blade 15 b, the corner blade 15 c, and the engagement portion 12 are formed in the blade body 11 and manufactured in the head body 1.
このヘッド本体素材1Aには、図5(e)に示すようにテーパ軸部13の後端面に開口して先端側に延びる連結部材取付穴16と、この連結部材取付穴16のさらに先端側に連通して該連結部材取付穴16より一段小径とされた有底の円筒状部材取付穴17とが軸線Oに沿って形成されていて、これら連結部材取付穴16と円筒状部材取付穴17とによりクーラント穴が形成されている。従って、本実施形態では、クーラント穴の軸線はヘッド本体1の中心となる軸線Oと同軸とされている。また、このうち円筒状部材取付穴17からは該円筒状部材取付穴17よりもさらに小径とされた複数の分岐穴18が形成されている。
As shown in FIG. 5 (e), the head body material 1 </ b> A has a connecting member mounting hole 16 that opens to the rear end surface of the tapered shaft portion 13 and extends to the front end side, and further to the front end side of the connecting member mounting hole 16. A bottomed cylindrical member mounting hole 17 communicating with the connecting member mounting hole 16 and having a diameter smaller than that of the connecting member mounting hole 16 is formed along the axis O. The connecting member mounting hole 16 and the cylindrical member mounting hole 17 As a result, a coolant hole is formed. Therefore, in this embodiment, the axis of the coolant hole is coaxial with the axis O that is the center of the head body 1. Of these, a plurality of branch holes 18 having a smaller diameter than the cylindrical member mounting hole 17 are formed from the cylindrical member mounting hole 17.
さらに、連結部材取付穴16の内周面には、軸線Oに沿った断面が円弧等の凹曲線状をなして軸線O回りに周回するす環状溝16aが、テーパ軸部13の後端面と、連結部材取付穴16と円筒状部材取付穴17との境界部とから間隔をあけて複数条(本実施形態では3条)形成されている。また、円筒状部材取付穴17の内周面にも同じく断面凹曲線状をなして軸線O回りに周回する環状溝17aが、連結部材取付穴16との境界部と分岐穴18の開口部との間に間隔をあけて1条形成されている。
Further, an annular groove 16 a that has a cross-section along the axis O that forms a concave curve such as an arc and circulates around the axis O is formed on the inner peripheral surface of the connecting member mounting hole 16 with the rear end surface of the tapered shaft portion 13. A plurality of strips (three strips in this embodiment) are formed at intervals from the boundary portion between the connecting member mounting hole 16 and the cylindrical member mounting hole 17. Further, an annular groove 17a that also has a concave curved cross-sectional shape and circulates around the axis O on the inner peripheral surface of the cylindrical member mounting hole 17 is formed between the boundary portion with the connecting member mounting hole 16 and the opening portion of the branch hole 18. One strip is formed with a gap between them.
さらにまた、複数の分岐穴18は、円筒状部材取付穴17の内周面から先端側に向かうに従い外周側に延びてヘッド本体素材1Aの外周面に開口する外周刃分岐穴18aと、円筒状部材取付穴17の底面から先端側に向かうに従いやはり外周側に延びてヘッド本体素材1Aの先端面に開口する底刃分岐穴18bとから構成されている。ここで、本実施形態では、4つずつの外周刃分岐穴18aと底刃分岐穴18bとが、それぞれ周方向に等間隔に、かつ互いには周方向に間隔をあけて交互にずらされて分岐するように形成されている。なお、底刃分岐穴18bは外周刃分岐穴18aよりも僅かに小径とされている。
Furthermore, the plurality of branch holes 18 extend to the outer peripheral side from the inner peripheral surface of the cylindrical member mounting hole 17 toward the distal end side and open to the outer peripheral surface of the head main body material 1A, and a cylindrical shape. A bottom blade branch hole 18b that extends to the outer peripheral side from the bottom surface of the member mounting hole 17 toward the front end side and opens at the front end surface of the head main body material 1A is formed. Here, in the present embodiment, the four outer peripheral edge branch holes 18a and the lower edge branch holes 18b are branched at equal intervals in the circumferential direction and alternately spaced apart from each other in the circumferential direction. It is formed to do. The bottom blade branch hole 18b has a slightly smaller diameter than the outer blade branch hole 18a.
図6は、このような円筒状部材取付穴17に取り付けられる上記円筒状部材3の素材となる円筒状部材素材3Aであり、この円筒状部材素材3Aは、連結部材2と同様に、ヘッド本体1を構成する上記硬質材料よりも硬度が低いステンレス鋼やダイス鋼等の鋼材のような塑性変形可能な金属材料により形成されて、概略有底の円筒状をなしている。ただし、この円筒状部材素材3Aの有底とされた底部には、軸線Oからの半径が底刃分岐穴18bの円筒状部材取付穴17底面における開口部と等しくなる位置に、軸線Oに平行に延びて該底部を貫通する底刃側貫通穴31が、底刃分岐穴18bと同数、周方向に等間隔に形成されている。ここで、軸線O回りの周方向に隣接する2つの底刃側貫通穴31の内周面同士の間の最短間隔は、円筒部材取付穴17の底面における底刃分岐穴18bの開口部の周方向の幅より大きくされるとともに、同じく軸線O回りの周方向に隣接する2つの底刃分岐穴18bの円筒部材取付穴17底面における開口部間の最短間隔は、底刃側貫通穴31の周方向の幅すなわち内径よりも大きくされている。
FIG. 6 shows a cylindrical member material 3A as a material of the cylindrical member 3 mounted in the cylindrical member mounting hole 17, and this cylindrical member material 3A is similar to the connecting member 2 in the head main body. 1 is formed of a metal material that can be plastically deformed, such as a steel material such as stainless steel or die steel having a lower hardness than the above-described hard material, and has a substantially bottomed cylindrical shape. However, the bottom of the cylindrical member material 3A having a bottom is parallel to the axis O at a position where the radius from the axis O is equal to the opening at the bottom surface of the cylindrical member mounting hole 17 of the bottom blade branch hole 18b. The same number of bottom blade side through holes 31 extending through the bottom portion as the bottom blade branch holes 18b are formed at equal intervals in the circumferential direction. Here, the shortest distance between the inner peripheral surfaces of the two bottom blade side through holes 31 adjacent in the circumferential direction around the axis O is the circumference of the opening of the bottom blade branch hole 18b on the bottom surface of the cylindrical member mounting hole 17. The shortest distance between the openings on the bottom surface of the cylindrical member mounting hole 17 of the two bottom blade branch holes 18b that are also adjacent to each other in the circumferential direction around the axis O is the circumference of the bottom blade side through hole 31. It is made larger than the width in the direction, that is, the inner diameter.
また、円筒状部材素材3Aの円筒壁部にも、円筒状部材素材3Aの底部の先端面を円筒状部材取付穴17の底面に当接させた状態で、軸線O方向における位置が外周刃分岐穴18aと等しくなる位置に、軸線Oに対して垂直に上記円筒壁部を貫通する外周刃側貫通穴32が外周刃分岐穴18aと同数、周方向に等間隔に形成されている。ここで、これら外周刃側貫通穴32と底刃側貫通穴31同士は、本実施形態では周方向において僅かにずれるように形成されており、そのずれ量、すなわち周方向に隣接する外周刃側貫通穴32および底刃側貫通穴31の中心と軸線Oとをそれぞれ結ぶ直線が軸線O方向視においてなす角度は、本実施形態のように外周刃分岐穴18aおよび外周刃側貫通穴32と底刃分岐穴18bおよび底刃側貫通穴31とが互いに同数、それぞれ等間隔に形成されている場合には、外周刃分岐穴18aと外周刃側貫通穴32とが周方向に一致した状態から、360°を外周刃分岐穴18aおよび底刃分岐穴18bとの合計数で除した角度(本実施形態では360°/8=45°)だけ円筒状部材3を回転させたときに、底刃側貫通穴31と底刃分岐穴18bが周方向に一致する角度とされている。
Further, the position of the cylindrical member material 3A in the direction of the axis O is also branched at the outer peripheral edge of the cylindrical member material 3A in a state where the bottom end surface of the cylindrical member material 3A is in contact with the bottom surface of the cylindrical member mounting hole 17. At the same position as the hole 18a, the outer peripheral blade side through holes 32 penetrating the cylindrical wall portion perpendicularly to the axis O are formed in the same number as the outer peripheral blade branch hole 18a at equal intervals in the circumferential direction. Here, the outer peripheral blade side through hole 32 and the bottom blade side through hole 31 are formed so as to be slightly shifted in the circumferential direction in the present embodiment, and the shift amount, that is, the outer peripheral blade side adjacent in the circumferential direction. The angles formed by the straight lines connecting the centers of the through hole 32 and the bottom blade side through hole 31 and the axis O when viewed in the direction of the axis O are the outer peripheral blade branch hole 18a and the outer blade side through hole 32 and the bottom as in this embodiment. When the same number of blade branch holes 18b and bottom blade side through holes 31 are formed at equal intervals, the outer peripheral blade branch holes 18a and the outer blade side through holes 32 are aligned in the circumferential direction. When the cylindrical member 3 is rotated by an angle (360 ° / 8 = 45 ° in the present embodiment) obtained by dividing 360 ° by the total number of the peripheral blade branch hole 18a and the bottom blade branch hole 18b, the bottom blade side Through hole 31 and bottom blade branch hole 18b It is an angle that matches the circumferential direction.
なお、円筒状部材素材3Aの内周面は、後端側の大部分が断面円形とされているのに対し、先端側(底部側)の部分は軸線Oに直交する断面が図6(d)に示すように後端側部分がなす円に略内接するような大きさの断面正六角形状とされていて、六角棒レンチに係合可能な係合穴部33とされ、底刃側貫通穴31はこの係合穴部33に部分的に開口するように形成されている。また、軸線O方向における円筒状部材素材3Aの長さは円筒状部材取付穴17の長さ(深さ)よりも僅かに短くされ、ただし円筒状部材素材3Aの底部先端面を円筒状部材取付穴17の底面に当接させた状態で、円筒状部材素材3Aの円筒壁部は円筒状部材取付穴17の環状溝17aよりも後端側に延びるようにされている。
Note that the inner peripheral surface of the cylindrical member material 3A has a circular shape in the most part on the rear end side, whereas the tip side (bottom side) has a cross section perpendicular to the axis O in FIG. ) As shown in FIG. 5, the cross-section is a regular hexagonal shape that is substantially inscribed in a circle formed by the rear end side portion, and is an engagement hole portion 33 that can be engaged with a hexagonal bar wrench. The hole 31 is formed so as to partially open in the engagement hole 33. Further, the length of the cylindrical member material 3A in the direction of the axis O is slightly shorter than the length (depth) of the cylindrical member mounting hole 17, provided that the bottom end surface of the cylindrical member material 3A is attached to the cylindrical member. The cylindrical wall portion of the cylindrical member material 3 </ b> A extends to the rear end side with respect to the annular groove 17 a of the cylindrical member mounting hole 17 in a state where it is in contact with the bottom surface of the hole 17.
ここで、この円筒状部材素材3Aの外径は、ヘッド本体素材1Aにおける円筒状部材取付穴17の内径よりも例えば0.2mm程度小さくされている。そして、このような円筒状部材素材3Aを、円筒状部材取付穴17(クーラント穴)の内周面に摺接して回転可能に収容された円筒状部材3として取り付けるのに、本実施形態では図7に示すように、この円筒状部材素材3Aを円筒状部材取付穴17に挿入した上で、円筒状部材素材3Aの内周部に、その内径よりも僅かに大きな外径の頭部Hを有する軸状のパンチPを後端側から打ち込んで上記係合穴部33の手前まで圧入することにより、円筒状部材素材3Aの円筒壁部を塑性変形させて拡径させるようにしている。
Here, the outer diameter of the cylindrical member material 3A is made, for example, about 0.2 mm smaller than the inner diameter of the cylindrical member mounting hole 17 in the head main body material 1A. In this embodiment, the cylindrical member material 3A is attached as the cylindrical member 3 that is slidably contacted with the inner peripheral surface of the cylindrical member mounting hole 17 (coolant hole) and rotatably accommodated. As shown in FIG. 7, after inserting this cylindrical member material 3A into the cylindrical member mounting hole 17, a head H having an outer diameter slightly larger than the inner diameter is formed on the inner peripheral portion of the cylindrical member material 3A. The shaft-shaped punch P is driven from the rear end side and is press-fitted to the front of the engagement hole 33, so that the cylindrical wall portion of the cylindrical member material 3A is plastically deformed and expanded in diameter.
従って、このように塑性変形させられた円筒状部材3は、パンチPが挿入された後端側部分の外周面が円筒状部材取付穴17の内周面に密着して略液密に摺接しつつ軸線O回りに回転可能とされるとともに、円筒状部材取付穴17に形成された環状溝17aにも塑性変形した外周面が入り込んで該環状溝17aと係合することにより、軸線O方向の移動が拘束されて抜け止めされる。なお、パンチPの圧入によって拡径させられた円筒状部材3の内周部の内径は、上記六角棒レンチが挿通可能な大きさとされる。また、こうして塑性変形させられた円筒状部材3において、軸線O回りの周方向に隣接する2つの外周刃側貫通穴32の内面同士の最短間隔は、円筒部材取付穴17の内周面における外周刃分岐穴18aの開口部の周方向の幅より大きくされるとともに、同じく軸線O回りの周方向に隣接する2つの外周刃分岐穴18aの円筒部材取付穴17内周面における開口部間の最短間隔は、円筒状部材3の外周刃側貫通穴32の周方向の幅より大きくされている。
Therefore, the cylindrical member 3 plastically deformed in this manner is in a substantially liquid-tight sliding contact with the outer peripheral surface of the rear end side portion into which the punch P is inserted in close contact with the inner peripheral surface of the cylindrical member mounting hole 17. While being rotatable around the axis O, the outer peripheral surface that is plastically deformed also enters the annular groove 17a formed in the cylindrical member mounting hole 17, and engages with the annular groove 17a. Movement is restrained and it is prevented from coming off. Note that the inner diameter of the inner peripheral portion of the cylindrical member 3 that has been expanded in diameter by the press-fitting of the punch P is such that the hexagonal bar wrench can be inserted therethrough. In the cylindrical member 3 thus plastically deformed, the shortest distance between the inner surfaces of the two outer peripheral blade side through holes 32 adjacent to each other in the circumferential direction around the axis O is the outer periphery of the inner peripheral surface of the cylindrical member mounting hole 17. The shortest distance between the openings on the inner peripheral surface of the cylindrical member mounting hole 17 of the two outer peripheral blade branch holes 18a which is made larger than the circumferential width of the opening of the blade branch hole 18a and is also adjacent in the circumferential direction around the axis O. The interval is made larger than the circumferential width of the outer peripheral blade side through hole 32 of the cylindrical member 3.
次に、こうして円筒状部材3が円筒状部材取付穴17(クーラント穴)に収容された後に、連結部材取付穴16に連結部材2を取り付けるのであるが、本実施形態ではこの連結部材2も円筒状部材3と同様に、上述のような金属材料によって形成された図示されない連結部材素材が塑性変形させられて拡径することにより、連結部材取付穴16に取り付けられるようにされている。
Next, after the cylindrical member 3 is accommodated in the cylindrical member mounting hole 17 (coolant hole) in this way, the connecting member 2 is attached to the connecting member mounting hole 16. In this embodiment, the connecting member 2 is also cylindrical. Similar to the shaped member 3, a connecting member material (not shown) formed of a metal material as described above is plastically deformed and expanded in diameter to be attached to the connecting member mounting hole 16.
すなわち、この連結部材素材は、先端側部分が連結部材取付穴16の内径より僅かに小さな外径の円筒状とされるとともに、後端側部分には連結部材取付穴16の内径よりも大きく、ヘッド本体1のテーパ軸部13後端面の外径よりは小さな外径の雄ねじ部21が形成されたものであり、先端側部分の内周部はこの雄ねじ部21にまで延長させられて連結部材素材を貫通している。
That is, the connecting member material has a front end portion that is cylindrical with an outer diameter slightly smaller than the inner diameter of the connecting member mounting hole 16, and a rear end side portion that is larger than the inner diameter of the connecting member mounting hole 16. A male screw portion 21 having an outer diameter smaller than the outer diameter of the rear end surface of the taper shaft portion 13 of the head body 1 is formed, and the inner peripheral portion of the tip side portion is extended to the male screw portion 21 to be a connecting member. It penetrates the material.
ただし、雄ねじ部21は塑性変形することがないように、その内周部の内径は先端側部分よりも僅かに大きくされる。また、軸線O方向における先端側部分の長さは連結部材取付穴16の長さ(深さ)よりも僅かに短くされ、ただし雄ねじ部21の先端面をヘッド本体素材1Aにおけるテーパ軸部13の後端面に当接させた状態で、この先端側部分は連結部材取付穴16の先端側の環状溝16aよりも先端側に延びるようにされている。
However, the inner diameter of the inner peripheral portion of the male screw portion 21 is slightly larger than that of the tip end portion so as not to be plastically deformed. In addition, the length of the tip side portion in the direction of the axis O is slightly shorter than the length (depth) of the connecting member mounting hole 16, except that the tip surface of the male screw portion 21 is formed on the taper shaft portion 13 of the head body material 1A. In a state of being in contact with the rear end surface, the tip end portion extends to the tip end side from the annular groove 16 a on the tip end side of the connecting member mounting hole 16.
そして、このように構成された連結部材素材の先端側部分を連結部材取付穴16に挿入した上で、この連結部材素材の内周部に、その先端側部分の内径よりも大きな外径で雄ねじ部21の内径よりは小さな外径の頭部を有する軸状のパンチを後端側から打ち込んで、連結部材取付穴16内で少なくとも先端側の環状溝16aを越える位置まで圧入することにより、連結部材素材の先端側部分を塑性変形させて拡径させ、連結部材2として連結部材取付穴16に取り付ける。
And after inserting the front end side part of the connection member raw material comprised in this way into the connection member attachment hole 16, it is a male screw with the outer diameter larger than the internal diameter of the front end side part in the inner peripheral part of this connection member raw material. A shaft-shaped punch having a head having an outer diameter smaller than the inner diameter of the portion 21 is driven from the rear end side, and press-fitted into the connecting member mounting hole 16 to a position exceeding at least the annular groove 16a on the front end side. The distal end portion of the member material is plastically deformed to expand its diameter, and is attached to the connecting member mounting hole 16 as the connecting member 2.
従って、こうして拡径させられた連結部材2の先端側部分は、円筒状部材3と同様にその外周面が連結部材取付穴16の内周面に密着するとともに環状溝16aにも塑性変形した外周面が入り込んで係合し、連結部材2は軸線O方向に抜け止めされる。ただし、この連結部材2はヘッド本体1に対して軸線O回りに回転することなく先端側部分の外周面が強固に連結部材取付穴16の内周面に密着するように、連結部材取付穴16と上記先端側部分との内外径差や連結部材素材の内周部とパンチ頭部の内外径差が設定される。図3および図4では、こうして塑性変形させられた先端側部分の内径が雄ねじ部21の内径と等しくなるようにされ、この内径は上記六角棒レンチが挿通可能な大きさとされている。
Accordingly, the distal end side portion of the connecting member 2 thus expanded in diameter has an outer peripheral surface that is in close contact with the inner peripheral surface of the connecting member mounting hole 16 and is also plastically deformed in the annular groove 16a, like the cylindrical member 3. The surfaces enter and engage, and the connecting member 2 is prevented from coming off in the direction of the axis O. However, the connecting member 2 does not rotate around the axis O with respect to the head body 1, and the outer peripheral surface of the tip side portion is firmly in close contact with the inner peripheral surface of the connecting member mounting hole 16. And the inner / outer diameter difference between the tip end portion and the inner / outer diameter difference between the inner peripheral portion of the connecting member material and the punch head. 3 and 4, the inner diameter of the tip side portion thus plastically deformed is made equal to the inner diameter of the male screw portion 21, and the inner diameter is set such that the above hexagonal bar wrench can be inserted.
なお、連結部材取付穴16においては環状溝16aを形成するのに代えて、あるいはこれと併せて、その内周面に研磨等を施すことなく、ヘッド本体1を形成する上記超硬合金等の粉末焼結材料を焼結したときの焼結肌のままとして、例えばJIS B 0601:2001(ISO 4287:1997)に規定された最大高さ粗さRzで5μm~200μmの範囲内の表面粗さ(ただし、基準長さ0.8mm、カットオフ値λs=0.0025mm、λc=0.8mm)の凹凸面とし、これに連結部材素材の先端側部分の塑性変形した外周面を入り込ませることにより、軸線O回りの回転と軸線O方向の移動とを拘束するようにしてもよい。
In addition, instead of or in addition to forming the annular groove 16a in the connecting member mounting hole 16, the cemented carbide or the like that forms the head body 1 without polishing or the like on its inner peripheral surface is used. Surface roughness within the range of 5 μm to 200 μm with the maximum height roughness Rz specified in JIS B 0601: 2001 (ISO 4287: 1997), for example, as the sintered skin when the powder sintered material is sintered. (However, by making the uneven surface of the reference length 0.8 mm, cut-off value λs = 0.005 mm, λc = 0.8 mm) and inserting the plastically deformed outer peripheral surface of the tip side portion of the connecting member material into this The rotation around the axis O and the movement in the direction of the axis O may be constrained.
このようにして連結部材2と円筒状部材3(切替手段)とが取り付けられたヘッド本体素材1Aに、上記切屑排出溝14と外周刃15a、底刃15b、およびコーナ刃15cと係合部12とが形成されてヘッド本体1とされる。そして、このヘッド本体1においては、上記複数の分岐穴18のうち、外周刃分岐穴18aは外周刃15aに向けてクーラントを供給するように切屑排出溝14の溝底に開口させられる一方、底刃分岐穴18bは底刃15bにクーラントを供給するように、該底刃15bのエンドミル回転方向T後方に連なる先端逃げ面に開口させられる。
In this way, on the head body material 1A to which the connecting member 2 and the cylindrical member 3 (switching means) are attached, the chip discharge groove 14, the outer peripheral blade 15a, the bottom blade 15b, the corner blade 15c, and the engaging portion 12 are provided. Are formed into the head body 1. In the head body 1, of the plurality of branch holes 18, the outer peripheral blade branch hole 18a is opened to the groove bottom of the chip discharge groove 14 so as to supply coolant toward the outer peripheral blade 15a. The blade branch hole 18b is opened at a tip flank that continues to the rear of the bottom blade 15b in the end mill rotation direction T so as to supply coolant to the bottom blade 15b.
このように構成された第1の実施形態であるクーラント穴付きヘッド交換式エンドミルの切削ヘッドは、上記ホルダ4に設けられた雌ねじ部に連結部材2の雄ねじ部がねじ込まれることにより、ヘッド本体1のテーパ軸部13がホルダ4のテーパ穴部に密着して上述のように円筒軸状のホルダ4先端部に取り付けられる。そして、このホルダ4の内周部を通して工作機械側から供給されたクーラントが、クーラント穴である連結部材取付穴16と円筒状部材取付穴17に取り付けられた連結部材2と円筒状部材3の内周部を介してヘッド本体1先端部に供給され、さらに切替手段である円筒状部材3の底刃側貫通穴31または外周刃側貫通穴32から底刃分岐穴18bまたは外周刃分岐穴18aを介して噴出させられる。
In the cutting head of the head-replaceable end mill with coolant hole according to the first embodiment configured as described above, the male threaded portion of the connecting member 2 is screwed into the female threaded portion provided in the holder 4, whereby the head body 1. The taper shaft portion 13 is attached to the tip end portion of the cylindrical shaft holder 4 in close contact with the taper hole portion of the holder 4 as described above. The coolant supplied from the machine tool side through the inner peripheral portion of the holder 4 is connected to the connection member 2 and the cylindrical member 3 attached to the connection member attachment hole 16 and the cylindrical member attachment hole 17 which are coolant holes. The bottom blade branch hole 18b or the outer blade branch hole 18a is supplied from the bottom blade side through hole 31 or the outer blade side through hole 32 of the cylindrical member 3 which is supplied to the tip of the head body 1 through the peripheral portion and is a switching means. Erupted through.
ここで、円筒状部材3における底刃側貫通穴31と外周刃側貫通穴32の周方向の位置と、ヘッド本体1における外周刃分岐穴18aと底刃分岐穴18bの円筒状部材取付穴17内開口部の周方向の位置とが、上述のように外周刃分岐穴18aと外周刃側貫通穴32とが周方向に一致した状態から、360°を外周刃分岐穴18aおよび底刃分岐穴18bとの合計数で除した角度だけ円筒状部材3を回転させたときに、底刃側貫通穴31と底刃分岐穴18bが周方向に一致するようにされているので、図3(a)に示すように外周刃側貫通穴32が外周刃分岐穴18aと一致する回転位置に円筒状部材3があるときには、図3(b)に示すように底刃側貫通穴31と底刃分岐穴18bとは連通せず、底刃15b側にクーラントは供給されない。逆に、図4(b)に示すように底刃側貫通穴31と底刃分岐穴18bとが一致する回転位置に円筒状部材3があるときには、図4(a)に示すように外周刃側貫通穴32は外周刃分岐穴18aと連通せず、外周刃15a側にクーラントは供給されない。
Here, the circumferential position of the bottom blade side through hole 31 and the outer peripheral blade side through hole 32 in the cylindrical member 3, and the cylindrical member mounting hole 17 of the outer peripheral blade branch hole 18 a and the bottom blade branch hole 18 b in the head body 1. From the state in which the outer circumferential edge branch hole 18a and the outer circumferential blade side through hole 32 coincide with each other in the circumferential direction as described above, the position of the inner opening in the circumferential direction is 360 ° from the outer circumferential edge branch hole 18a and the bottom edge branch hole. When the cylindrical member 3 is rotated by an angle divided by the total number of 18b, the bottom blade side through hole 31 and the bottom blade branch hole 18b are made to coincide with each other in the circumferential direction. When the cylindrical member 3 is at a rotational position where the outer peripheral blade side through hole 32 coincides with the outer peripheral blade branch hole 18a as shown in FIG. 3B, the bottom blade side through hole 31 and the bottom blade branch as shown in FIG. It does not communicate with the hole 18b, and no coolant is supplied to the bottom blade 15b side. . On the other hand, when the cylindrical member 3 is located at the rotational position where the bottom blade side through hole 31 and the bottom blade branch hole 18b coincide as shown in FIG. 4B, the outer peripheral blade as shown in FIG. 4A. The side through hole 32 does not communicate with the outer peripheral blade branch hole 18a, and no coolant is supplied to the outer peripheral blade 15a side.
従って、これら外周刃15aと底刃15bのいずれか一方が専ら切削に使用される場合には、切削ヘッドをホルダ4に取り付ける前に、連結部材2および円筒状部材3の内周部を通して六角棒レンチを挿入して係合穴部33に係合させ、使用される一方の切刃に向けてクーラントが供給されるように切替手段としての円筒状部材3の回転位置を設定して分岐穴18を選択することにより、他方の切刃に向けてクーラントが供給されるのを避けることができる。このため、クーラントが無駄に消費されるのを防ぐことができるとともに、工作機械において必要以上のクーラント供給圧を要することもなく、効率的な切削加工を行うことができる。
Accordingly, when either one of the outer peripheral blade 15a and the bottom blade 15b is exclusively used for cutting, the hexagonal bar is passed through the inner peripheral portion of the connecting member 2 and the cylindrical member 3 before attaching the cutting head to the holder 4. A wrench is inserted and engaged with the engagement hole 33, and the rotation position of the cylindrical member 3 as the switching means is set so that the coolant is supplied toward one of the cutting blades to be used. By selecting, it is possible to avoid supplying the coolant toward the other cutting edge. For this reason, it is possible to prevent wasteful consumption of the coolant, and it is possible to perform efficient cutting without requiring excessive coolant supply pressure in the machine tool.
また、本実施形態では、クーラントを供給する分岐穴18を選択する切替手段が、クーラント穴である円筒状部材取付穴17の内周面に摺接して回転可能とされた円筒状部材3とされており、上述のようにこの円筒状部材3の回転位置を設定することにより、円筒状部材取付穴17の周方向にずらされて分岐した分岐穴18に円筒状部材3の外周刃側または底刃側の貫通穴31、32の一方を一致させて、使用される切刃にクーラントが供給されるようにしている。このため、例えば使用しない分岐穴をプラグで塞ぐ場合のように、分岐穴18が多くなったときに作業が繁雑となることが無く、簡単かつ速やかに選択する分岐穴18を切り替えることができ、またプラグの紛失などのおそれもなくなって管理が容易になる。
Further, in the present embodiment, the switching means for selecting the branch hole 18 for supplying the coolant is the cylindrical member 3 that is slidable in contact with the inner peripheral surface of the cylindrical member mounting hole 17 that is the coolant hole and is rotatable. By setting the rotational position of the cylindrical member 3 as described above, the cylindrical member 3 is shifted in the circumferential direction of the cylindrical member mounting hole 17 and branched into the branch hole 18 which is branched to the outer peripheral blade side or bottom. One of the through holes 31 and 32 on the blade side is made to coincide so that the coolant is supplied to the cutting blade to be used. For this reason, for example, when a branch hole that is not used is closed with a plug, work does not become complicated when the number of branch holes 18 increases, and the branch hole 18 to be selected can be switched easily and quickly. In addition, there is no risk of losing the plug and management becomes easy.
しかも、この円筒状部材3は、硬質材料よりなるヘッド本体1よりも低硬度の金属材料によって形成された円筒状部材素材3Aが塑性変形させられて、その外周面がクーラント穴である円筒状部材取付穴17の内周面に密着するとともに環状溝17aと係合することにより、この内周面に摺接して回転可能とされたものであるので、環状溝17aへの上記外周面の係合によって円筒状部材3を円筒状部材取付穴17から抜け止めしつつ回転させることができるとともに、これら内外周面の密着によって、クーラントがその間から漏れ出て切削に使用されない切刃に供給されてしまったり、切削加工中に円筒状部材3が回転してしまったりするのを防ぐことができる。
Moreover, the cylindrical member 3 is a cylindrical member in which a cylindrical member material 3A formed of a metal material having a hardness lower than that of the head body 1 made of a hard material is plastically deformed, and an outer peripheral surface thereof is a coolant hole. Since it is in close contact with the inner peripheral surface of the mounting hole 17 and is engaged with the annular groove 17a, it can be slidably contacted with the inner peripheral surface and can be rotated. Therefore, the outer peripheral surface is engaged with the annular groove 17a. The cylindrical member 3 can be rotated while preventing the cylindrical member 3 from coming out of the cylindrical member mounting hole 17, and due to the close contact between the inner and outer peripheral surfaces, the coolant leaks from the gap and is supplied to a cutting blade that is not used for cutting. It is possible to prevent the cylindrical member 3 from rotating during the cutting process.
さらに、こうしてクーラントの漏れを防止するのに樹脂やゴム製のOリングなどを必要としないので、例えば切屑排出溝14や外周刃15a、底刃15b、コーナ刃15cが形成されたヘッド本体1の刃部11の表面に各種のコーティング被膜を被覆するような場合にヘッド本体1が高温となっても、上述のようなクーラントの漏れを確実に防止することが可能である。
Further, in order to prevent leakage of the coolant in this way, a resin or rubber O-ring or the like is not required. Therefore, for example, the head main body 1 in which the chip discharge groove 14, the outer peripheral blade 15a, the bottom blade 15b, and the corner blade 15c are formed. Even when the surface of the blade portion 11 is coated with various coating films, even if the head main body 1 becomes hot, it is possible to reliably prevent the coolant leakage as described above.
一方、本実施形態では、本発明を切削工具の刃部11に外周刃15aと底刃15bとが形成されたエンドミルに適用しており、軸線O方向の切込みが小さくて専ら底刃15bだけが切削に使用される場合や、逆に径方向の切込みが小さくて専ら外周刃15aだけが切削に使用される場合でも、複数の分岐穴18を上述のような外周刃分岐穴18aと底刃分岐穴18bとすることにより、特に上記切替手段としての円筒状部材3の回転によって確実かつ容易にこれら外周刃分岐穴18aと底刃分岐穴18bとの間でクーラントを選択的に供給することが可能となる。
On the other hand, in the present embodiment, the present invention is applied to an end mill in which an outer peripheral blade 15a and a bottom blade 15b are formed on a blade portion 11 of a cutting tool, and the cutting in the direction of the axis O is small and only the bottom blade 15b is exclusively used. Even when used for cutting, or conversely, when only the outer peripheral edge 15a is used for cutting with a small radial cut, the plurality of branch holes 18 are divided into the outer peripheral edge branch holes 18a and the bottom edge branch as described above. By using the holes 18b, it is possible to selectively supply coolant between the outer peripheral blade branch holes 18a and the bottom blade branch holes 18b reliably and easily, especially by the rotation of the cylindrical member 3 as the switching means. It becomes.
なお、上記第1の実施形態では、本発明を、ヘッド交換式のこのようなエンドミルに適用した場合について説明したが、図8および図9に示す第2の実施形態のように、ヘッド交換式ではない一般的なソリッドエンドミルに本発明を適用することも可能である。ここで、これら図8および図9において、図1ないし図7に示した第1の実施形態と共通する部分には同一の符号を配して説明を簡略化する。
In the first embodiment, the case where the present invention is applied to such a head replaceable end mill has been described. However, as in the second embodiment shown in FIGS. 8 and 9, the head replaceable type is used. The present invention can also be applied to general solid end mills that are not. Here, in these FIG. 8 and FIG. 9, the same code | symbol is distribute | arranged to the part which is common in 1st Embodiment shown in FIG. 1 thru | or 7, and description is simplified.
すなわち、この第2の実施形態においては、軸線Oを中心とした略円筒状をなすエンドミル本体41全体が超硬合金等の上記硬質材料により形成されており、切屑排出溝14や外周刃15a、底刃15b、コーナ刃15cが形成される前の図9に示すこのエンドミル本体41のエンドミル本体素材42のように、その後端から先端側に向けてクーラント穴43が軸線Oに沿って形成されていて、このクーラント穴43の先端部が円筒状部材取付穴17とされている。
That is, in the second embodiment, the entire end mill body 41 having a substantially cylindrical shape centering on the axis O is formed of the hard material such as cemented carbide, and the chip discharge groove 14 and the outer peripheral blade 15a, Like the end mill main body material 42 of the end mill main body 41 shown in FIG. 9 before the bottom blade 15b and the corner blade 15c are formed, a coolant hole 43 is formed along the axis O from the rear end toward the front end. The tip of the coolant hole 43 is a cylindrical member mounting hole 17.
そして、この円筒状部材取付穴17に、第1の実施形態と同様の切替手段としての円筒状部材3が回転可能かつ抜け止めされて取り付けられるとともに、この円筒状部材取付穴17から外周刃分岐穴18aと底刃分岐穴18bとが分岐穴18として分岐させられていて、図8に示すように切屑排出溝14の溝底と底刃15bのエンドミル回転方向T後方側に連なる先端逃げ面に開口させられ、選択的に供給されるクーラントを外周刃15aまたは底刃15bに供給可能としている。
Then, the cylindrical member 3 as a switching means similar to that of the first embodiment is attached to the cylindrical member attachment hole 17 so as to be rotatable and prevented from being detached, and the outer peripheral edge branches from the cylindrical member attachment hole 17. The hole 18a and the bottom blade branch hole 18b are branched as a branch hole 18, and as shown in FIG. 8, on the tip flank that continues to the groove bottom of the chip discharge groove 14 and the end mill rotation direction T rear side of the bottom blade 15b. The coolant that is opened and selectively supplied can be supplied to the outer peripheral blade 15a or the bottom blade 15b.
従って、このような第2の実施形態のクーラント穴付き切削工具であるソリッドエンドミルにおいても、外周刃15aと底刃15bのいずれか一方が専ら切削に使用される場合には、エンドミル本体41の後端側からクーラント穴43に六角棒レンチを挿入して円筒状部材3を回転させることにより、使用される一方の切刃にクーラントを供給するとともに、他方の切刃への供給は停止することができ、クーラントの無駄や供給圧の低下を防ぐことができる。
Therefore, also in the solid end mill which is the cutting tool with a coolant hole of the second embodiment, when either one of the outer peripheral edge 15a and the bottom edge 15b is exclusively used for cutting, the rear end mill body 41 has a rear end. By inserting a hexagon wrench into the coolant hole 43 from the end side and rotating the cylindrical member 3, the coolant is supplied to one of the used cutting blades and the supply to the other cutting blade is stopped. It is possible to prevent the waste of coolant and the decrease in supply pressure.
なお、これら第1、第2の実施形態では、本発明をヘッド交換式やソリッドのラジアスエンドミルに適用した場合について説明したが、ボールエンドミルやスクエアエンドミルなどの他の種のエンドミルや、エンドミル以外のクーラント穴付き切削工具に適用することも可能である。また、これら第1、第2の実施形態では、複数の分岐穴18を切替手段によって選択してエンドミルの外周刃15aと底刃15bのいずれか一方にのみクーラントを供給するようにしているが、これと併せて、例えば円筒状部材3を回転させたときに外周刃分岐穴18aと底刃分岐穴18bの双方に連通するような複数の貫通穴32を形成したり、あるいは乾式切削用に外周刃分岐穴18aと底刃分岐穴18bのいずれにも貫通穴32が連通しない円筒状部材3の回転位置を設けるようにしてもよい。
In the first and second embodiments, the case where the present invention is applied to a head exchange type or a solid radius end mill has been described. However, other types of end mills such as a ball end mill and a square end mill, and other end mills may be used. It is also possible to apply to a cutting tool with a coolant hole. In the first and second embodiments, the plurality of branch holes 18 are selected by the switching means so that the coolant is supplied only to one of the outer peripheral edge 15a and the bottom edge 15b of the end mill. In addition to this, for example, when the cylindrical member 3 is rotated, a plurality of through holes 32 are formed so as to communicate with both the outer peripheral blade branch hole 18a and the bottom blade branch hole 18b, or the outer periphery is used for dry cutting. You may make it provide the rotational position of the cylindrical member 3 in which the through-hole 32 does not communicate with any of the blade branch hole 18a and the bottom blade branch hole 18b.
さらに、上記各実施形態では、複数の分岐穴18である外周刃分岐穴18aと底刃分岐穴18bとが、クーラント穴である円筒状部材取付穴17の内面に、軸線O方向にずらされて開口するように分岐させられるとともに、周方向にもずらされて開口するように分岐させられているが、特に捩れた外周刃15aを有するエンドミルのような切削工具では、軸線O方向のどの位置に外周刃分岐穴18aをあけるかによってそのクーラント穴への開口部の位置も変わるので、例えば外周刃分岐穴18aと底刃分岐穴18bとが周方向には同じ位置で分岐させられていてもよい。
Further, in each of the above embodiments, the outer peripheral blade branch hole 18a and the bottom blade branch hole 18b, which are the plurality of branch holes 18, are shifted in the direction of the axis O on the inner surface of the cylindrical member mounting hole 17 which is a coolant hole. It is branched so as to open, and is also branched so as to be shifted in the circumferential direction. In particular, in a cutting tool such as an end mill having a twisted outer peripheral edge 15a, at any position in the axis O direction. Since the position of the opening to the coolant hole also changes depending on whether the outer peripheral blade branch hole 18a is opened, for example, the outer peripheral blade branch hole 18a and the bottom blade branch hole 18b may be branched at the same position in the circumferential direction. .
また、このように外周刃分岐穴18aと底刃分岐穴18bとを複数の分岐穴18として切替手段によりクーラントの供給を選択するだけでなく、例えばクーラント穴の軸線O方向にずらして分岐した複数の外周刃分岐穴18aの間で切替手段によりクーラントを供給する分岐穴を選択したり、あるいはクーラント穴の底面から底刃15bの先端逃げ面に開口する底刃分岐穴18bと底刃15bのギャッシュに開口する底刃分岐穴とを周方向にずらして形成して、これらの底刃分岐穴の間でクーラントを供給する分岐穴を選択したりするようにしてもよい。
Further, in this way, the peripheral blade branch hole 18a and the bottom blade branch hole 18b are set as a plurality of branch holes 18, and not only the coolant supply is selected by the switching means, but also, for example, a plurality of branches branched in the direction of the axis O of the coolant hole. The branch hole for supplying coolant by the switching means is selected between the outer peripheral blade branch holes 18a, or the bottom blade branch hole 18b and the bottom blade 15b are opened from the bottom surface of the coolant hole to the tip clearance surface of the bottom blade 15b. The bottom blade branch holes that are open in the circumferential direction may be formed so as to be shifted in the circumferential direction, and a branch hole that supplies coolant between these bottom blade branch holes may be selected.
Claims (4)
- 工具本体にクーラント穴が形成されていて、このクーラント穴は上記工具本体の刃部において複数の分岐穴に分岐させられているとともに、該クーラント穴には上記複数の分岐穴の間でクーラントを供給する分岐穴を選択可能とする切替手段が備えられていることを特徴とするクーラント穴付き切削工具。 A coolant hole is formed in the tool body, and the coolant hole is branched into a plurality of branch holes at the blade portion of the tool body, and coolant is supplied to the coolant hole between the plurality of branch holes. A cutting tool with a coolant hole, characterized in that it is provided with a switching means that enables selection of a branch hole to be made.
- 上記複数の分岐穴は、上記クーラント穴の周方向と軸線方向のうち少なくとも一方にずらされて分岐させられており、上記切替手段は、上記クーラント穴の内周面に摺接して回転可能に収容された円筒状部材であって、この円筒状部材には複数の貫通穴が形成されていて、これら複数の貫通穴は互いに、一部の貫通穴が上記複数の分岐穴のうち一部の分岐穴に連通したときに、残りの貫通穴は残りの分岐穴とはずらされるように形成されていることを特徴とする請求項1に記載のクーラント穴付き切削工具。 The plurality of branch holes are shifted and branched in at least one of a circumferential direction and an axial direction of the coolant hole, and the switching means is slidably in contact with the inner peripheral surface of the coolant hole and accommodated rotatably. A plurality of through holes are formed in the cylindrical member, and the plurality of through holes are mutually connected, and some of the through holes are part of the plurality of branch holes. The cutting tool with a coolant hole according to claim 1, wherein the remaining through hole is formed so as to be offset from the remaining branch hole when communicating with the hole.
- 上記工具本体は硬質材料より形成されるとともに、上記円筒状部材は上記硬質材料よりも硬度が低い金属材料より形成されており、上記クーラント穴の内周面には環状溝が形成されていて、上記円筒状部材は、その外周面が上記クーラント穴の内周面に密着して上記環状溝と係合させられることにより該内周面に摺接して回転可能とされていることを特徴とする請求項2に記載のクーラント穴付き切削工具。 The tool body is formed of a hard material, the cylindrical member is formed of a metal material having a lower hardness than the hard material, and an annular groove is formed on the inner peripheral surface of the coolant hole. The cylindrical member has an outer peripheral surface that is brought into close contact with an inner peripheral surface of the coolant hole and is engaged with the annular groove so that the cylindrical member is slidably contacted with the inner peripheral surface and is rotatable. The cutting tool with a coolant hole according to claim 2.
- 上記工具本体は、上記刃部に底刃と外周刃とを有するエンドミルの該刃部が形成された工具本体であり、上記複数の分岐穴は上記底刃と外周刃とに上記クーラントを供給するようにそれぞれ開口させられていて、上記切替手段は、上記底刃に上記クーラントを供給する底刃分岐穴と上記外周刃に上記クーラントを供給する外周刃分岐穴との間でクーラントを供給する分岐穴を選択可能とされていることを特徴とする請求項1から請求項3のうちいずれか一項に記載のクーラント穴付き切削工具。 The tool body is a tool body in which the blade portion of an end mill having a bottom blade and an outer peripheral blade is formed on the blade portion, and the plurality of branch holes supply the coolant to the bottom blade and the outer peripheral blade. The switching means is a branch that supplies coolant between a bottom blade branch hole that supplies the coolant to the bottom blade and an outer blade branch hole that supplies the coolant to the outer blade. The cutting tool with a coolant hole according to any one of claims 1 to 3, wherein a hole is selectable.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011172032A JP2013035094A (en) | 2011-08-05 | 2011-08-05 | Cutting tool with coolant hole |
JP2011-172032 | 2011-08-05 |
Publications (1)
Publication Number | Publication Date |
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WO2013021856A1 true WO2013021856A1 (en) | 2013-02-14 |
Family
ID=47668368
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2012/069414 WO2013021856A1 (en) | 2011-08-05 | 2012-07-31 | Cutting tool with coolant hole |
Country Status (2)
Country | Link |
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JP (1) | JP2013035094A (en) |
WO (1) | WO2013021856A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015029850A1 (en) * | 2013-08-30 | 2015-03-05 | 三菱マテリアル株式会社 | End mill with coolant hole |
CN105642925A (en) * | 2016-04-07 | 2016-06-08 | 大连理工大学 | Ultrasonic cutter |
JP6362803B1 (en) * | 2018-01-23 | 2018-07-25 | 株式会社松浦機械製作所 | Cutting tools |
CN108723403A (en) * | 2017-04-17 | 2018-11-02 | 江苏扬碟钻石工具有限公司 | A kind of high-performance Integral alloy cutter |
CN111001840A (en) * | 2019-12-10 | 2020-04-14 | 广州市淞滨工程技术有限公司 | High numerical control drilling equipment of stability that radiating effect is good |
US11420273B2 (en) | 2019-10-17 | 2022-08-23 | Kennametal Inc. | Rotary cutting tools and applications thereof |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP6446862B2 (en) * | 2014-06-30 | 2019-01-09 | アイシン・エィ・ダブリュ株式会社 | Drilling tool |
EP3342518B1 (en) | 2016-12-28 | 2019-12-11 | Sandvik Intellectual Property AB | Milling tool with coolant flow grooves |
CN112719386A (en) * | 2020-12-22 | 2021-04-30 | 大连理工大学 | Ultra-low temperature medium hollow transmission type inner-cooling milling cutter with high cooling efficiency |
KR102506952B1 (en) * | 2021-07-16 | 2023-03-07 | 유림공업 주식회사 | bite holder |
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US3037264A (en) * | 1959-09-08 | 1962-06-05 | Carl W Mossberg | Coolant type milling cutter |
JP2002046014A (en) * | 2000-08-04 | 2002-02-12 | Sumitomo Electric Ind Ltd | Rotary cutting tool |
US20030223831A1 (en) * | 2002-06-03 | 2003-12-04 | Viens Daniel V. | Methodology and tool design for high speed machining |
-
2011
- 2011-08-05 JP JP2011172032A patent/JP2013035094A/en not_active Withdrawn
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2012
- 2012-07-31 WO PCT/JP2012/069414 patent/WO2013021856A1/en active Application Filing
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Publication number | Priority date | Publication date | Assignee | Title |
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US3037264A (en) * | 1959-09-08 | 1962-06-05 | Carl W Mossberg | Coolant type milling cutter |
JP2002046014A (en) * | 2000-08-04 | 2002-02-12 | Sumitomo Electric Ind Ltd | Rotary cutting tool |
US20030223831A1 (en) * | 2002-06-03 | 2003-12-04 | Viens Daniel V. | Methodology and tool design for high speed machining |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015029850A1 (en) * | 2013-08-30 | 2015-03-05 | 三菱マテリアル株式会社 | End mill with coolant hole |
CN105642925A (en) * | 2016-04-07 | 2016-06-08 | 大连理工大学 | Ultrasonic cutter |
CN108723403A (en) * | 2017-04-17 | 2018-11-02 | 江苏扬碟钻石工具有限公司 | A kind of high-performance Integral alloy cutter |
CN108723403B (en) * | 2017-04-17 | 2023-09-08 | 江苏扬碟钻石工具有限公司 | High-performance integral alloy cutter |
JP6362803B1 (en) * | 2018-01-23 | 2018-07-25 | 株式会社松浦機械製作所 | Cutting tools |
JP2019126867A (en) * | 2018-01-23 | 2019-08-01 | 株式会社松浦機械製作所 | Cutting tool |
US10562111B2 (en) | 2018-01-23 | 2020-02-18 | Matsuura Machinery Corporation | Cutting tool |
US11420273B2 (en) | 2019-10-17 | 2022-08-23 | Kennametal Inc. | Rotary cutting tools and applications thereof |
CN111001840A (en) * | 2019-12-10 | 2020-04-14 | 广州市淞滨工程技术有限公司 | High numerical control drilling equipment of stability that radiating effect is good |
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