WO2019116475A1 - フライス工具及びワークの加工方法 - Google Patents
フライス工具及びワークの加工方法 Download PDFInfo
- Publication number
- WO2019116475A1 WO2019116475A1 PCT/JP2017/044791 JP2017044791W WO2019116475A1 WO 2019116475 A1 WO2019116475 A1 WO 2019116475A1 JP 2017044791 W JP2017044791 W JP 2017044791W WO 2019116475 A1 WO2019116475 A1 WO 2019116475A1
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- WIPO (PCT)
- Prior art keywords
- insert
- milling tool
- cutting edge
- diameter portion
- rib
- 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
- B23C3/00—Milling particular work; Special milling operations; Machines therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/02—Milling-cutters characterised by the shape of the cutter
- B23C5/10—Shank-type cutters, i.e. with an integral shaft
- B23C5/1081—Shank-type cutters, i.e. with an integral shaft with permanently fixed cutting inserts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C5/00—Milling-cutters
- B23C5/16—Milling-cutters characterised by physical features other than shape
- B23C5/18—Milling-cutters characterised by physical features other than shape with permanently-fixed cutter-bits or teeth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2220/00—Details of milling processes
- B23C2220/04—Milling with the axis of the cutter inclined to the surface being machined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2220/00—Details of milling processes
- B23C2220/56—Plunge milling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2240/00—Details of connections of tools or workpieces
- B23C2240/08—Brazed connections
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2250/00—Compensating adverse effects during milling
- B23C2250/12—Cooling and lubrication
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23C—MILLING
- B23C2265/00—Details of general geometric configurations
- B23C2265/08—Conical
Definitions
- the present invention relates to a milling tool and a workpiece machining method capable of machining an undercut portion such as a rib having a return flange with high efficiency and high accuracy.
- Patent Document 1 describes a T-shaped cutter that forms an undercut on the side surface of a workpiece.
- the T-shaped cutter has a head coupled to one end of a shank, and has a plurality of bottom blades having a cutting edge on the tip end side of the head and a plurality of tops having a cutting edge on the proximal side.
- the blade portions are alternately arranged in the circumferential direction, and the cutting edges of the bottom blade portion and the upper blade portion form an integral structure with the shank and the head.
- the present invention has as its technical object the solution of the problems of the prior art, and provides a milling tool and a method of machining a workpiece capable of machining an undercut portion such as a rib having a return flange with high efficiency and high accuracy.
- the purpose is to
- the head is the shank portion And an enlarged diameter portion whose diameter gradually increases in the distal direction from the proximal end in contact with the diameter, and a reduced diameter portion whose diameter gradually decreases in the distal direction from the largest diameter portion;
- a milling tool is provided.
- a method of processing a work undercutting an inner portion of a rib of a work fixed to a table of a machine tool and a return flange formed subsequently to the rib A milling tool is mounted on the spindle of the machine tool and rotated, and the inside of the return flange is processed with the cutting edge of the diameter-increasing portion of the milling tool, and the side of the rib is processed with the cutting edge of the diameter-reducing portion of the milling tool.
- the head of the milling tool includes an enlarged diameter portion whose diameter gradually increases in the direction from the proximal end to the distal end, and a reduced diameter portion whose diameter gradually decreases in the distal direction from the largest diameter portion. Since the cutting edge is provided in the diameter portion and the reduced diameter portion, the milling tool is made to approach the undercut portion of the work diagonally, and the work of the work can be performed without interference with the return flange. Can be shortened. Therefore, the undercut portion can be efficiently processed with high quality under high processing conditions.
- FIG. 1 is a front view of a milling tool according to a first embodiment of the invention
- FIG. 1 is a side view of the milling tool as viewed from a direction different from that of FIG.
- FIG. 2 is a front view of the milling tool of FIG. 1 with the cutting edge removed
- Fig. 3 is a side view of the milling tool of Fig. 2 with the cutting edge removed
- FIG. 2 is a bottom view of the milling tool of FIG. 1 viewed from the head side
- FIG. 2 is a plan view of the milling tool of FIG. 1 viewed from the shank side
- FIG. 2 is a front view of the upper insert used in the milling tool of FIG. 1
- FIG. 8 is a perspective view of the upper insert of FIG. 7;
- FIG. 8 is a perspective view of the upper insert of FIG. 7 viewed from another direction.
- FIG. 2 is a front view of the lower insert used in the milling tool of FIG. 1;
- FIG. 8 is a perspective view of the lower insert of FIG. 7;
- 11 is a perspective view of the lower insert of FIG. 10 viewed from another direction.
- It is a schematic diagram for demonstrating the method to process the rib with a return flange. It is a schematic diagram for demonstrating the method to process the rib with a return flange. It is a schematic diagram for demonstrating the method to process the rib with a return flange. It is a schematic diagram for demonstrating the method to process the rib with a return flange.
- FIG. 19 is a perspective view seen in the direction of arrow line XIX in FIG. 18; It is the side view seen in the direction of arrow line of sight XX in FIG. FIG.
- FIG. 19 is a side view seen in the direction of arrow line XXI in FIG. 18; It is a schematic diagram for demonstrating the process of the undercut part in a corner part, and the milling tool is processing the approximate-central part of a corner part in FIG.
- FIG. 23 is a perspective view seen in the direction of arrow line XXIII in FIG. 22.
- FIG. 23 is a side view seen in the direction of arrow line XXIV in FIG. 22.
- FIG. 23 is a side view looking in the direction of arrow line XXV in FIG. 22.
- FIG. 23 is a perspective view seen in the direction of arrow line XXIII in FIG. 22.
- FIG. 23 is a side view seen in the direction of arrow line XXIV in FIG. 22.
- FIG. 23 is a side view looking
- FIG. 27 is a perspective view seen in the direction of arrow line XXVII in FIG. 26.
- FIG. 27 is a side view seen in the direction of arrow line XXVIII in FIG. 26.
- FIG. 27 is a side view looking in the direction of arrow line XXIX in FIG.
- FIG. 5 is a front view of a milling tool according to a second embodiment of the present invention.
- FIG. 31 is a perspective view of the milling tool of FIG. 30.
- FIG. 31 is a bottom view of the milling tool of FIG. 30 as viewed from the head side.
- FIG. 31 is a plan view of the milling tool of FIG. 30, viewed from the shank side;
- FIG. 31 is a front view of the milling tool of FIG. 30 with the cutting edge removed;
- FIG. 31 is a perspective view of the milling tool of FIG. 30 with the cutting edge removed;
- FIG. 31 is a bottom view of the milling tool of FIG. 30 as seen from the head side with the cutting edge removed.
- FIG. 31 is a plan view of the milling tool of FIG. 30 as seen from the shank side showing the cutting edge removed;
- FIG. 31 is a front view of an insert used in the milling tool of FIG. 30.
- FIG. 31 is a perspective view of the insert of FIG. 30.
- FIG. 31 is a perspective view of the insert of FIG. 30 from another direction.
- FIGS. 1 to 12 a first embodiment of a milling tool according to the present invention will be described.
- the milling tool 10 comprises a cylindrical shank 12 and a head 14 integrally formed at the tip of the shank 12.
- the head 14 has a substantially frusto-conical enlarged diameter portion 14 a whose diameter increases in the distal direction from the proximal end side in contact with the shank 12 and a substantially conical reduced diameter whose diameter further decreases in the distal direction from the enlarged diameter portion 14 a It has a portion 14b and is formed roughly in the shape of an abacus ball.
- a transition portion 14c is formed between the enlarged diameter portion 14a and the reduced diameter portion 14b as the largest diameter portion having the largest diameter.
- the head 14 also has an upper groove 16 formed in the enlarged diameter portion 14a and a lower groove 18 formed in the reduced diameter portion 14b.
- the upper and lower grooves 16 and 18 are alternately arranged at equal angular intervals around the central axis O of the head 14.
- the head 14 has three upper grooves 16 and three lower grooves 18.
- the upper and lower grooves 16 and 18 are arranged at equal angular intervals in this embodiment, they may be arranged at unequal angular intervals to prevent chatter vibration.
- An upper seat 16 a is formed in each of the upper grooves 16, and a lower seat (FIGS. 3 and 4) is formed in each of the lower grooves 18.
- An upper insert 20 is attached to each of the upper seats 16a, and a lower insert 22 is attached to each of the lower seats 18a.
- the three upper inserts 20 are disposed in the enlarged diameter portion 14a, and the three lower inserts 22 are disposed in the reduced diameter portion 14b.
- the upper insert 20 and the lower insert 22 are The number is not limited to three, and at least one upper insert 20 and at least one lower insert 22 may be disposed. Therefore, each of the enlarged diameter portion 14 a and the reduced diameter portion 14 b may be provided with at least one upper and lower grooves 16 and 18.
- the upper seat 16a is inclined in a direction in which the straight main cutting edge 20c (FIGS. 7-9) of the upper insert 20 attached to the upper seat 16a gradually approaches the transition portion 14c in the rotational direction of the milling tool 10. It is formed to extend to In the lower seat 18a, the linear main cutting edge 22c (FIGS. 10 to 12) of the lower insert 22 attached to the lower seat 18a gradually approaches the transition portion 14c in the rotational direction of the milling cutter 10 It is formed to extend obliquely in the direction of
- the milling tool 10 can be provided with a coolant passage for supplying coolant to the machining area.
- the coolant passage is an inlet passage 24 passing through the shank 12 along the central axis O of the milling tool 10, a side wall radially from the inlet passage 24 penetrating the head 14 and facing the upper seat 16a of each upper groove 16
- An upper radial passage 26a opening to 16b and a lower radial passage 26b opening to a side wall 18b facing the lower seat 18a of each lower groove 18 may be included.
- the upper insert 20 has an upper end 20a and a lower end 20b.
- the upper insert 20 is attached to the upper seat 16a such that the lower end 20b is located near the transition 14c.
- the upper insert 20 is also mounted on the upper seat 16a, with a rake face 20e disposed opposite to the upper seat 16a and facing the side wall 16b of the upper groove 16, and a flank 20g directed radially outward.
- An arc-shaped minor cutting edge 20d provided adjacent to the main cutting edge 20c and the lower end 20b extending substantially linearly from the upper end 20a by the rake face 20e and the flank 20g and connected to the main cutting edge 20c Is formed.
- the lower insert 22 has an upper end 22a and a lower end 22b.
- the lower insert 22 is attached to the lower seat 18a such that the upper end 22a is located near the transition 14c.
- the lower insert 22 is also mounted on the lower seat 18a, with a rake face 22e disposed opposite the lower seat 18a and facing the side wall 18b of the lower groove 18, and a radially outwardly directed relief And 20f.
- An arc-shaped minor cutting edge 22d provided adjacent to the main cutting edge 22c, which extends substantially linearly from the lower end 22b by the rake face 22e and the flank 22f, and connected to the main cutting edge 22c. Is formed.
- the lower insert 22 further has a bottom cutting edge 22g connected to the main cutting edge 22c at its lower end 22b and an inner cutting edge 22h connected to the bottom cutting edge 22g.
- the upper insert 20 and the lower insert 22 are located at the upper seat 16a, the lower side so that the respective secondary cutting edges 20d, 22d are twisted forward with respect to the main cutting edges 20c, 22c in the rotational direction of the milling tool 10. It is attached to the side seat 18a. That is, the upper insert 20 and the lower insert 22 are attached to be alternately inclined.
- the upper insert 20 is mounted on the upper seat 16a such that the main cutting edges 20c of all the upper inserts 20 rotate along one conical surface when the milling tool 10 is rotated about the central axis O Be
- the lower insert 22 rotates the milling tool 10 about the central axis O
- the lower inserts 22 rotate so that the main cutting edges 22c of all the lower inserts 22 rotate along one conical surface. It is attached to the seat 18a.
- the sub cutting edges 20d and 22d may be disposed on the rear side with respect to the main cutting edges 20c and 22c in the rotational direction of the milling tool 10, or may be disposed without twisting.
- the two conical surfaces drawn by the main cutting edges 20c, 22c of the upper insert 20 and the lower insert 22 as the milling tool 10 rotates defines the line of intersection between the two conical surfaces.
- it is symmetrical with respect to the plane, it may be asymmetric depending on the target processing process and the shape of the workpiece.
- a line of intersection between the plane including the central axis O and the two conical surfaces (the generating line of each conical surface) intersects at a predetermined angle. This angle can be of various values depending on the intended processing process.
- the angle formed by the two lines of intersection may be, for example, an angle corresponding to the angle between the rib and the return flange protruding from the upper end of the rib as described later, preferably 90 °.
- the main cutting edge 20c of the upper insert 20 is formed longer than the overhang dimension (width) of the return flange.
- the minor cutting edges 20d, 22d mill one arc which radially bulges the head 14 It is attached to the upper seat 16a and the lower seat 18a so as to move along the rotating body shape which is a locus when it is rotated about the central axis O of 10.
- This rotary body shape can be a shape inscribed in both of the two conical surfaces drawn by the main cutting edges 20c and 22c of the upper insert 20 and the lower insert 22 when the above-described milling tool 10 rotates.
- the shank 12 and the head 14 are integrally formed using tool steel, and the upper insert 20 and the lower insert 22 are formed by using the upper seat 16a of the head 14 and a suitable bonding technique such as brazing. It can be attached to the lower seat 18a. Furthermore, after the upper insert 20 and the lower insert 22 are attached to the upper seat 16a and the lower seat 18a, the upper insert 20 and the lower insert 22 are ground, and the two cones described by the main cutting edges 20c, 22c.
- Each generatrix of the surface is at an angle corresponding to the angle between the rib of the work and the return flange projecting from the upper end of the rib, and the shape of the rotary body drawn by the minor cutting edges 20d, 22d is the two cones It may be inscribed on both sides of the surface.
- workpiece 100 is bottom wall 102, rib 104 forming a thin wall extending perpendicularly from bottom wall 102, and generally parallel to the bottom wall 102 from the top of rib 104 in opposite directions. It has projecting first and second return flanges 106,108.
- first and second return flanges 106,108 In the example of FIGS. 13A-15B, for example, at least four machining centers with at least one linear feed axis of orthogonal three axes and at least one rotary feed axis, preferably two rotary feed axes on linear feed axes of orthogonal three axes.
- Machine tool such as a 5-axis machining center with an end mill 70, the milling tool 10 according to the present embodiment and the T-shaped cutter 72 sequentially attached to the tip of the spindle 80 of the machine tool
- the product 100 is cut from a thick plate made of a metallic material such as an alloy.
- the end mill 70, the milling tool 10 and the T-shaped cutter 72 are attached to the main shaft 80 via a tool holder 74, respectively. Further, the work is fixed to a table (not shown) of the machine tool.
- first and second return flanges 106, 108 It is processed from the side of the first and second return flanges 106, 108, in this example the first return flange 106 side.
- the end mill 70 is then replaced with the milling tool 10 (FIG. 14A) to remove (undercut) material from the portion 110 between the first return flange 106 and the bottom wall 102.
- the rotational feed axis of the machine tool is set so that the side face of the rib 104 can be processed by the lower insert 22.
- the milling tool 10 is fed in a direction perpendicular to the surface of the work, and then, as shown by the arrow Z, in the direction from the return flange 106 to the bottom wall 102 by a predetermined distance (pick feed amount).
- the material is sent again in the direction perpendicular to the paper surface, and the material 110 is sequentially removed in the form of a strip having a width corresponding to the pick feed amount from the first return flange 106 side to the bottom wall 102 side.
- Removing material from portion 110 by sending the milling tool 10 in a direction perpendicular to the page while repeating the pick feed in the direction indicated by arrow Z until the lower insert 22 touches the surface of the bottom wall 102, finally the figure
- a triangular prism-shaped portion 110a extending in the direction perpendicular to the paper surface remains between the rib 104 and the bottom wall 102.
- This portion 110a can be removed using a T-shaped cutter 72 (FIG.
- FIG. 15A While undercutting by the milling tool 10 is being performed, not only the main cutting edges 20c, 22c, the sub cutting edges 20d, 22d, but also the bottom cutting edge 22g and the inner cutting edge 22h contribute to the machining process, so that there is a peeling. Processing can be performed without occurrence.
- the portion 112 between the second return flange 108 and the bottom wall 102 can also be removed in the same manner as described above.
- the bottom wall 102, the rib 104 extending perpendicularly from the bottom wall 102, and the first and second return flanges 106 and 108 projecting in opposite directions substantially parallel to the bottom wall 102 from the top of the rib 104 It becomes possible for the product 100 to be cut out of a metal thick plate material such as an aluminum alloy.
- Product 100 can be, for example, a component of an aircraft wing.
- the portion 110a can also be removed using a T-shaped cutter 72, as shown in FIG.
- the T-shaped cutter 72 is oriented so that its rotational axis is parallel to the rib 104. Therefore, the protrusion length of the T-shaped cutter 72, that is, the distance L TC from the lower end surface of the tool holder 74 to the tip of the T-shaped cutter 72 must be longer than the height of the rib 104.
- the conical surface drawn by the lower insert 22 is obliquely oriented such that it contacts the rib 104.
- the projection length L TP of the milling tool 10 can be a length that does not cause interference between the return flange 106 or 108 and the tool holder 74. Since the overhanging length of the return flanges 106 and 108 is usually much shorter than the height of the rib 104, the projecting length L TP of the milling tool 10 should be shorter than the projecting length L TC of the T-shaped cutter 72. Can.
- the tool usually has high static rigidity against bending and falling and dynamic rigidity against vibration, so that it is possible to increase the rotational speed and feed rate of the tool. Therefore, by using the milling cutter 10 according to the present embodiment, it is possible to process the product 100 more efficiently than when the conventional T-shaped cutter 72 is used. In addition, chatter vibration is less likely to occur, and the machined surface quality is also improved.
- the milling cutter 10 not only processes straight ribs as shown in FIGS. 13A-15B, but also has a predetermined angle as shown in FIGS. 18-29, 90 ° in the illustrated example. It is also possible to process a rib bent at 18 to 29, flat bottom wall 202, first and second ribs 204 and 206 vertically projecting from bottom wall 202, return flange 208 vertically projecting from the upper end of first rib 204, and It has corner portions 210 at which the first and second ribs 204 and 206 intersect. The first and second ribs 204, 206 joined together by the corners 210 extend along the bottom wall 202 at an angle of 90 ° to each other.
- the workpiece 200 is fixed to a table (not shown) of the machine tool.
- the upper edge of the first rib 204 and the lower surface of the return flange 208 are processed as described in FIGS. 14A and 14B. More specifically, the milling tool 10 simultaneously processes the lower surface of the return flange 208 by the main cutting edge 20c of the upper insert 20 and the side surface of the first rib 204 by the main cutting edge 22c of the lower insert 22. 18 is straight-fed along the side surface of the upper edge of the first rib 204 from one end (lower end in FIG. 18) of the first rib 204 toward the corner portion 210 (upward in FIG. 18).
- the milling tool 10 when the milling tool 10 reaches the entrance of the corner portion 210, the milling tool 10 continues to be generally arc-shaped along the inner circumferential surface 210a of the upper edge portion of the corner portion 210.
- the cutting direction (the direction of the rotation axis O of the milling tool 10) by simultaneous 5-axis control It becomes possible to cut while changing freely), and it becomes possible to process the corner portion 210 having a return flange as shown in the drawing without forming a processing mark such as a step on the processing surface.
- the milling tool 10 when the milling tool 10 reaches the outlet of the corner portion 210, the milling tool 10 continues to the end of the second rib 206 along the side of the second rib 206 without interruption. It is fed straight (rightward in FIGS. 22 and 24). During this time, the main cutting edge 22c of the lower insert 22 processes the side surface of the upper edge of the second rib 206.
- the milling tool 10 reaches the tip of the second rib 206 (right part in FIGS. 22 and 24) and the processing of the upper edge of the second rib 206 is finished, the milling tool 10 approaches the bottom wall 202 Pick feed is given in the direction (downward). Then, it is linearly fed toward the corner portion 210 along the side surface of the second rib 206, and on the side surface of the second rib 206, the lower side of the processing surface completed in the previous processing step is processed.
- FIGS. 18 to 29 straight lines are shown between the first rib 204 and the corner portion 210 and between the corner portion 210 and the second rib 206.
- a linear step or groove or other processing mark is formed on the actual processing surface. There is nothing to do.
- the side surface of the upper edge of the first rib 204 is processed with the lower surface of the return flange 208, and the side surface of the upper edge of the corner portion 210 and the second rib 206 is processed, and the first rib 204, the corner
- the uncut portion (not shown) that is finally similar to the triangular portion 110a shown in FIG. 14B is the first rib 204, the corner It is formed between the portion 210 and the second rib 206 and the bottom wall 202.
- the uncut portion can be removed by a T-shaped cutter as shown in FIG. 15A.
- the corner R portions 204 a, 210 b, 206 a can be formed between the first rib 204, the corner portion 210 and the second rib 206, and the bottom wall 202 according to the shape of the T-shaped cutter.
- the return flange 208 is extended along the upper end of the first rib 204 substantially parallel to the bottom wall 202 and with a fixed width. .
- the return flange 208 gradually decreases in width as it approaches the second rib 206 at the corner portion 210, and the second rib 206 is substantially not provided with the return flange.
- the workpiece 200 may have a return flange similar to the return flange 208 along the upper end of the second rib 206.
- the insert is divided into the upper insert 20 and the lower insert 22.
- both inserts 20, 22 are integrally formed into one V-shaped insert.
- the insert is attached from the enlarged diameter portion of the head to the reduced diameter portion.
- the milling tool 50 comprises a cylindrical shank 52 and a head 54 integrally formed at the tip of the shank 52.
- the head 54 has a substantially frusto-conical enlarged diameter portion 54a whose diameter increases in the distal direction from the base end side in contact with the shank 52, and a substantially truncated conical shape whose diameter decreases in the distal direction from the enlarged diameter portion 54a.
- And has a portion 54b, and is generally formed in the shape of an abacus ball.
- a transition portion 54c is formed between the enlarged diameter portion 54a and the reduced diameter portion 54b as a maximum diameter portion having a maximum diameter.
- the transition portion 54 c has a shape of a rotating body in which an arc bulging in the radial direction of the head 54 is rotated around the central axis O of the milling tool 50.
- the head 54 has an upper groove 56 formed in the enlarged diameter portion 54a and a lower groove 58 formed in the reduced diameter portion 54b.
- the head 54 is formed with four pairs of upper and lower grooves 56 and 58 disposed equiangularly around the central axis O of the head 54.
- the upper groove 56 and the lower groove 58 in each pair are continuous and form a groove formed over the enlarged diameter portion 54a, the transition portion 54c, and the reduced diameter portion 54b.
- the number of grooves is not an essential requirement of the present invention, and at least one groove can be provided.
- the grooves 56, 58 are formed with a seat 62 for attaching the insert 60.
- the seat 62 consists of a plane that receives an insert 60 formed in a V shape.
- the plane forming the seat 62 is parallel to the central axis O of the milling tool 50.
- the milling tool 50 can be provided with a coolant passage for supplying coolant to the processing area.
- the coolant passage is an inlet passage 64 passing through the shank 52 along the central axis O of the milling tool 50, a sidewall 56a radially from the inlet passage 64 through the head 54 and facing the seat 62 at each upper groove 56 And the lower radial passage 66b open to the side wall 58a facing the seat 62 at each lower groove 58.
- the insert 60 has the first and second arms 60a and 60b, and the bent portion 61 connecting the first and second arms 60a and 60b. It is shaped like a square.
- the insert 60 also has a rake face 60f disposed opposite the seat 62 and facing the side wall 56a of the upper groove 56 when attached to the seat 62, and a flank 60g directed radially outward. ing.
- the first main cutting edge 60c rotates along the same conical surface
- the second main cutting edge 60d is in the same conical surface. It is attached to the seat 62 so as to rotate along.
- two intersecting lines (generating lines of each conical surface) between the conical surface drawn by the first and second main cutting edges 60c and 60d and the plane including the central axis O are predetermined Cross at an angle.
- This angle can be of various values depending on the intended processing process.
- the angle formed by the two lines of intersection may be, for example, an angle corresponding to the angle between the rib and the return flange protruding from the upper end of the rib as described later, preferably 90 °.
- the insert 60 is preferably attached to the seat 62 as shown in FIGS. 32 and 33, and the first and second main cutting edges 60c, 60d, the minor cutting edge 60e, the bottom cutting edge 60h and The inner cutting edge 60 j is disposed in one plane including the central axis O of the milling tool 50. Further, the first and second main cutting edges 60c, 60d, the sub cutting edge 60e, the bottom cutting edge 60h and the inner cutting edge 60j are the first and second main cutting edges 60c of the insert 60 opposite in diameter. 60d, a sub cutting edge 60e, a bottom cutting edge 60h and an inner cutting edge 60j are disposed in the same plane in which the 60f is disposed.
- the minor cutting edge 60 e rotates a radially expanding arc of the head 14 about the central axis O of the milling tool 50. It is attached to the seat 62 so as to draw a locus of one rotary body shape.
- This rotary body shape can be a shape inscribed in both of the two conical surfaces drawn by the first and second main cutting edges 60c and 60d of the insert 60 when the above-mentioned milling tool 50 rotates.
- the insert 60 can be attached to the seat 62 using a suitable bonding technique such as brazing. Furthermore, after the insert 60 is attached to the seat 62, the insert 60 is ground and the generatrix of each of the two conical surfaces described by the first and second main cutting edges 60c, 60d is a rib and the rib And the shape of the rotary body drawn by the minor cutting edge 60e may be inscribed in both of the two conical surfaces.
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Abstract
Description
先ず、図1~図12を参照して、本発明のフライス工具の第1の実施の形態を説明する。
第1の実施形態では、インサートを上側インサート20と下側インサート22とに分割したが、第2の実施形態では、両インサート20、22を一体化して、くの字形の1つのインサートに形成し、該インサートをヘッドの拡径部から縮径部に亘って取り付けた形態となっている。
12 シャンク
14 ヘッド
14a 拡径部
14b 縮径部
20 上側インサート
22 下側インサート
104 リブ
106 第1のリターンフランジ
108 第2のリターンフランジ
204 第1のリブ
206 第2のリブ
208 リターンフランジ
210 コーナー部
Claims (8)
- シャンク部と、該シャンク部の先端側に設けられ、切れ刃を有するヘッドとで構成されたフライス工具において、
前記ヘッドは、前記シャンク部に接する基端部から先端方向に直径が次第に拡大する拡径部と、最大直径部から先端方向に直径が次第に縮小する縮径部とを含み、
前記拡径部および前記縮径部に切れ刃が設けられていることを特徴としたフライス工具。 - 前記拡径部には少なくとも1つの上側溝が形成され、前記縮径部には少なくとも1つの下側溝が形成されており、該少なくとも1つの上側溝と下側溝の各々には、前記切れ刃を形成したインサートを取り付ける座が形成されている請求項1に記載のフライス工具。
- 前記上側溝には上側座が形成され、前記下側溝には下側座が形成されており、前記上側座には上側インサートが取り付けられ、前記下側座には下側インサートが取り付けられる請求項2に記載のフライス工具。
- 前記上側インサートと下側インサートは、各々の一端から直線状に延びる主切れ刃と、該主切れ刃に接続され前記上側インサートと下側インサートの他端に配置された凸状に湾曲した副切れ刃とを有しており、前記上側インサートと下側インサートは、各々の副切れ刃が、前記拡径部と縮径部との接合部に隣接するように配置される請求項3に記載のフライス工具。
- 前記下側インサートは、前記副切れ刃とは反対側の端部に底切れ刃と内切れ刃とが形成されている請求項4に記載のフライス工具。
- 前記上側溝から下側溝へ亘って延びる座が形成されており、該座にくの字形のインサートが取り付けられる請求項2に記載のフライス工具。
- 工作機械のテーブルに固定されたワークのリブと該リブに続けて形成されるリターンフランジとの内側部分をアンダーカットするワークの加工方法において、
請求項1に記載のフライス工具を前記工作機械の主軸に取り付けて回転させ、
前記フライス工具の前記拡径部の切れ刃でリターンフランジの内側を加工し、前記フライス工具の前記縮径部の切れ刃でリブの側面を加工するワークの加工方法。 - 前記工作機械は、少なくとも2つの回転送り軸を有する5軸工作機械であり、
ワークに対する前記フライス工具の相対的な姿勢と位置とを制御してリターンフランジ付きのリブが交差するコーナー部分のアンダーカット行う請求項7に記載のワークの加工方法。
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US16/771,990 US20210078086A1 (en) | 2017-12-13 | 2017-12-13 | Milling tool and workpiece machining method |
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JP2019559473A JP6896101B2 (ja) | 2017-12-13 | 2017-12-13 | フライス工具及びワークの加工方法 |
CN201780097664.6A CN111542409B (zh) | 2017-12-13 | 2017-12-13 | 铣刀以及工件加工方法 |
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US11731204B2 (en) * | 2020-10-19 | 2023-08-22 | Iscar, Ltd. | High-feed milling tool |
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CA3085419C (en) | 2022-08-16 |
US11890687B2 (en) | 2024-02-06 |
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