JP2005342850A - Throwaway type face milling cutter and mounting member of supporter for use in face milling cutter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a milling cutter body from being involved in damage, even if an excessive load is generated, in a large-diameter throwaway type face milling cutter used for deep cutting in particular. <P>SOLUTION: A mounting groove 2 penetrating from the tip of the milling cutter body 1 to the rear end side is formed in the outer circumference of an approximately disk-shaped milling cutter 1, a positioning face 7 is formed in a face 1B facing the rear end side of the milling cutter body 1 in the circumference of an open groove part in the rear end side of the mounting groove 2, and the mounting member 5 is fitted in the mounting groove 2 and mounted thereto by the mounting means. The mounting member 5 is detachably mounted with a throwaway tip 3 having a cutting edge 3B projecting to the tip side of the milling cutter body and a supporter 4 retaining the throwaway tip 3, and the rear end of the mounting member 5 is formed with a flange part 10 abutting on the positioning face 7 with its facing the tip side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a throw-away face mill having a large-diameter mill body and a supporter mounting member used for the face mill.

As this type of throw-away type front milling machine, for example, in Patent Document 1, a recess is provided on the outer periphery of the tip of the tool body (milling body) that is open toward the tip of the tool body and outward in the radial direction. The support member (supporter) is disposed on the seat surface facing the rotation direction of the tool body with the bottom surface facing the direction opposite to the rotation direction of the tool body, and the surface of the support member facing the rotation direction of the tool body The cutting edge tip (throw away tip) is pressed and fixed by a wedge press-fitted between the upper surface of the cutting edge tip and the contact surface of the recess facing the direction opposite to the rotation direction of the tool body. Has been. In the front milling described in Patent Document 1, the wedge is simply inserted between the upper surface of the cutting edge tip and the contact surface of the recess, for example, by forming the seating surface of the milling body into a concave shape. In addition, it is proposed that the distance between the intermediate portion between the front side edge and the rear side edge of the seat surface and the bottom surface increases as the distance from the front side edge and the rear side edge increases. ing.
Japanese Patent Laid-Open No. 62-287908

  By the way, in such a throw-away type front milling machine, surface cutting (black peeling) of, for example, an aluminum thick plate material before rolling is performed from one having an outer diameter of several tens of mm that cuts a plane of a general machine part. There are even large diameters as many as several meters outside diameter. In such a large-diameter throw-away type face mill, the outer diameter of the milling body is increased and the size of the milling body is increased, and accordingly, the cost of the milling body is significantly increased. However, on the other hand, cutting with such a large-diameter throw-away face mill results in heavy cutting with a large depth of cut and feed per blade, so a throw-away tip and a supporter that holds this during cutting, The load acting on the milling body is also large, and if an excessive load is applied, not only the throw away tip and the supporter but also the milling body may be damaged. However, if the throw-away tip or supporter is damaged, it can be replaced. However, the above-mentioned large-diameter throw-away type face milling machine will cause significant damage when the milling body is damaged. In particular, when the seating surface of the concave portion of the milling body is formed in a concave shape as in Patent Document 1, there is also a problem that damage tends to occur because the load concentrates on the front and rear side edges. .

  The present invention has been made under such a background, and particularly in a large-diameter throw-away face mill used for heavy cutting as described above, even if an excessive load occurs, the mill body is damaged. It is an object of the present invention to provide a throw-away type front milling machine capable of preventing the above-mentioned problem and to provide a supporter mounting member suitable for use in such a throw-away type front milling machine.

  In order to solve the above-mentioned problems and achieve such an object, the throw-away type front milling machine of the present invention is provided on the outer periphery of a substantially disk-shaped milling body that is rotated around the axis line, and the axial tip of the milling body. A mounting groove that penetrates from the front end to the rear end side is formed, and a positioning surface that forms a predetermined angle with respect to the axis is formed on the surface facing the rear end side of the milling body around the rear end opening portion of the mounting groove. At the same time, an attachment member is fitted into the attachment groove and attached by attachment means, and the throw-away tip having a cutting blade protruding toward the tip side of the milling body and the throw-away tip are held on the attachment member A supporter is detachably mounted, and a hook portion is formed on the rear end portion of the mounting member so as to contact the positioning surface of the rear end surface of the milling body toward the front end in the axial direction. Characterized in that was.

  Therefore, in the throw-away type face mill of the present invention configured as described above, since the throw-away tip and the supporter that holds the throw-away tip are attached to the milling body via the attachment member, an excessive load acts during cutting. Even if the milling body side is further damaged from the throw-away tip and the supporter, the damage can be suppressed up to this mounting member. In other words, it is possible to prevent damage to the milling body and to repair it simply by replacing the mounting member. Therefore, there is no need to replace an expensive milling body particularly in a large-diameter throw-away front milling machine. Is.

  By the way, in order to form a smooth cutting surface in a front milling machine, particularly the front runout accuracy (position accuracy of the cutting blade toward the front end in the axial direction) is important. A throwaway face mill is no exception. However, in the throw-away type front milling device in which the throw-away tip and the supporter are attached to the milling body via the attachment member as in the present invention, the attachment accuracy of the throw-away tip and the supporter to the attachment member is ensured. However, if the mounting accuracy of the mounting member itself to the milling body is insufficient, particularly in the axial direction, the front runout accuracy of the cutting blade cannot be ensured. However, in order to attach the mounting member to the milling body while ensuring the mounting accuracy in the axial direction as described above, one stop groove-like mounting groove that does not reach the rear end surface of the milling body from the tip side is formed on the outer periphery of the milling body. In this regard, a configuration in which the rear end surface of the mounting member is positioned by contacting the wall surface facing the front end side of the mounting groove is conceivable, but when such a configuration is adopted, the axial direction of the milling body is considered. When an excessive load is applied to the rear end side, there is a possibility that the milling body may be damaged by causing the attachment member together with the throw-away tip and the supporter to break through the wall portion between the wall surface and the rear end surface of the milling body.

  Therefore, in the throw-away type front milling machine according to the present invention, the mounting groove fitted with the mounting member and mounted by the mounting means is formed so as to penetrate from the front end side to the rear end side in the axial direction of the milling body. A positioning surface that forms a predetermined angle with respect to the axis is formed on the surface facing the rear end side of the milling body in the vicinity of the groove portion on the rear end side of the rear end side. The collar part which contacts toward the side is formed. Therefore, even if an excessive load is applied toward the rear end side in the axial direction of the milling body during cutting, the mounting member is pressed so as to be pulled out from the mounting groove penetrating in the axial direction to the rear end side. Therefore, it is possible to prevent the milling body from being damaged by the degree of breakage of the mounting means, while the front runout accuracy of the cutting blade is directed to the rear end side of the milling body and forms a predetermined angle with respect to the axis. Since the above-mentioned flange portion of the mounting member comes into contact with the positioning surface toward the tip side, according to the throw-away type front milling machine of the present invention, it is possible to prevent damage to the milling body more reliably, but with a higher height. Precision plane cutting can be achieved.

  In addition, a plurality of throw-away tips and supporters are usually attached to such a throw-away type face mill, and the number of attachment members and attachment grooves for attaching these is particularly large with a large-diameter one. Will also increase. However, when the front runout accuracy of the cutting blade is ensured by bringing the rear end surface of the mounting member into contact with the wall surface of the mounting groove-shaped mounting groove as described above, The cutting blade cannot be arranged at a predetermined position in the axial direction unless the positions of the wall surfaces in the axial direction are exactly the same. Therefore, it is extremely difficult to make these positions coincide with each other.

  On the other hand, in the throw-away face mill of the present invention, a plurality of mounting grooves are thus formed in the milling body, and the throw-away tip and the supporter are attached to each of these mounting grooves via the mounting member. Even in this case, the above-mentioned positioning surface of the milling body, which is positioned by contacting the flange of the mounting member, is formed on the surface facing the rear end side of the milling body in the vicinity of the opening end portion of the mounting groove penetrating the milling body. Therefore, by forming the annular positioning surface around the axis on the surface facing the rear end side of the milling body, the mounting member attached to the plurality of mounting grooves is also formed. The cutting blade can be arranged at a predetermined position by accurately and easily matching the position where the collar portion abuts in the axial direction. Moreover, in order to form a positioning surface having a predetermined angle with respect to the axis on the surface facing the rear end side of the milling body so as to be flush with the center of the axis, the same as in cutting, around this axis. It is only necessary to turn the surface facing the rear end side while rotating the milling body, thereby making it possible to reliably and easily match the positions of the positioning surfaces of the mounting grooves in the axial direction. It becomes possible to arrange at a predetermined position with higher accuracy.

  Furthermore, in the throw-away type front milling machine to which a plurality of such throw-away tips are mounted, the cutting blades of some of the throw-away tips are arranged on the inner circumference in the radial direction of the milling body rather than the cutting blades of the remaining throw-away tips. The finished surface is adjusted by swinging the front so that it protrudes slightly toward the tip end in the axial direction, and the machining surface cut by the cutting blade of the remaining throwaway tip, which is a rough blade, is Finishing is performed by the above-described finishing blade following the feeding. Therefore, in such a case, a mounting groove in which the throwaway tip and the supporter are mounted on the mounting member is opened to the front end surface of the mounting member and the side surface facing the outer peripheral side of the milling body. By forming a front runout adjustment spacer of the cutting blade between the wall surface facing the front end side of the mounting groove and the rear end surface of the supporter, the thickness of the spacer is made different. By adjusting the distance between the wall surface of the groove and the rear end surface of the supporter, it is possible to easily adjust the front runout between the rough blade and the finishing blade as described above, while the mounting member and supporter are common between the mounting grooves. It becomes possible.

  Further, the mounting member of the supporter of the present invention is a mounting member of the supporter used in the throw-away type front milling as described above, and includes a mounting member body having a substantially rectangular parallelepiped block shape fitted into the mounting groove, A mounting groove for opening the tip of the mounting member body and mounting the throwaway tip and the supporter is formed on one side surface of the mounting member body facing the outer peripheral side of the milling body. It is characterized in that the flange portion is formed so as to protrude on at least one of the other side surfaces of the mounting member body other than the above. Therefore, in such a mounting member, the mounting groove can be formed in a cross-sectional “U” shape into which the mounting member main body having a substantially rectangular parallelepiped shape can be fitted. The remaining two side surfaces of the mounting member main body extending between the one side surface of the mounting member main body and the other side surface on the opposite side are in close contact with the two wall surfaces of the mounting grooves facing in the direction. Therefore, it is possible to ensure high attachment rigidity to the milling body. Further, if the flange portion is formed on the other side surface directed to the inner peripheral side of the milling body opposite to the one side surface in the mounting member body, the remaining two side surfaces are formed with high accuracy. Thus, the circumferential positioning accuracy can be further improved.

  FIG. 1 to FIG. 6 show an embodiment of the throw-away type face mill of the present invention and a supporter mounting member used for the face mill. In the present embodiment, the milling body 1 has a substantially disk shape centered on the axis O as shown in FIGS. 1 and 2, and is rotated around the axis O in the rotation direction indicated by the symbol T in the drawing. It is used for processing (planar cutting). Then, on the outer periphery of the milling body 1, the outer peripheral edge of the milling body 1 in the direction of the axis O extends from the front end surface (lower end surface in FIG. 2) 1A to the surface 1B facing the rear end side (upper side in FIG. 1). A plurality of mounting grooves 2 that penetrate therethrough are formed at equal intervals in the circumferential direction (in FIG. 1, there are eight locations for explanation). In each of these mounting grooves 2, a throw-away tip 3 and a supporter 4 are provided. A mounting member 5 to be mounted is fitted, and is detachably mounted by mounting screws 6 as mounting means.

  Here, the mounting groove 2 has a “U” shape that opens to the outer peripheral side of the milling body 1 in a cross section perpendicular to the axis O, and has a rectangular planar bottom surface 2 </ b> A facing the outer peripheral side of the milling body 1. Each of the bottom surface 2A and the wall surface 2B is composed of a wall surface 2B that is perpendicular to the groove bottom surface 2A and parallel to each other and faces the rotation direction T and a wall surface 2C that faces the rear side in the rotation direction T. , 2C are formed so as to extend parallel to the axis O, and in particular, the wall surface 2C is formed so as to extend on a plane including the axis O. The plurality of mounting grooves 2 are formed so as to be rotationally symmetric about the axis O at every angle obtained by equally dividing the entire circumference of the milling body 1 by the number of the mounting grooves 2. In addition, screw holes (not shown) into which the mounting screws 6 are screwed are formed at the four corners of the bottom surface 2A.

  On the surface 1B facing the rear end side of the milling body 1, a positioning surface 7 that forms a predetermined angle with respect to the axis O is formed around the groove portion of the mounting groove 2 on the rear end side of the milling body 1. ing. In this embodiment, the positioning surface 7 is formed in an annular shape that circulates around the axis O around the outer peripheral edge of the surface 1B facing the rear end of the milling body 1, and the inner diameter (radius) of the positioning surface 7 extends from the axis O. The diameter (radius) of the mounting groove 2 up to the bottom surface 2A is made smaller, so that the positioning surfaces 7 of the plurality of mounting grooves 2 are located on one annular surface that is flush with each other and continuous. Yes. Further, in the present embodiment, the positioning surface 7 is a flat surface formed so that the angle formed with respect to the axis O is 90 °, that is, vertical, and accordingly, the bottom surface 2A and the wall surface 2B of the mounting groove 2 are formed. 2C is orthogonal to the positioning surface 7.

  The surface 1B facing the rear end side of the milling body 1 on the inner peripheral side with respect to the positioning surface 7 is located on the inner peripheral side via a cylindrical wall surface 1C having an axis O perpendicular to the positioning surface 7 as a center. As it goes, it forms a conical surface that protrudes toward the rear end side, and is formed so as to continue to the boss surface 1D around the axis O. Further, a through hole 1E centering on the axis O is formed at the center of the milling body 1, and a key groove 1F extending in the diameter direction with respect to the axis O from the opening of the through hole 1E is formed on the boss surface 1D. Has been. On the other hand, the outer peripheral side of the front end surface 1A of the milling body 1 is a flat surface perpendicular to the axis O, and a concave portion 1G that is recessed toward the rear end side is formed on the inner peripheral side. On the boss surface 1D, a plurality of mounting holes 1H extending in parallel with the axis O are provided at equal intervals in the circumferential direction so as to avoid the key groove 1F.

  The mounting member 5 according to an embodiment of the present invention attached to the mounting groove 2 of the milling body 1 has a substantially rectangular parallelepiped block shape in which the mounting member body 8 can be fitted into the mounting groove 2, that is, in this way. One side surface 8A facing the outer peripheral side of the milling body 1 in a state of being fitted in the mounting groove 2, and the other side that is opposite to the one side surface 8A and is in close contact with the bottom surface 2A of the mounting groove 2 Side surface 8B, the remaining side surfaces 8C and 8D extending between these side surfaces 8A and 8B and in close contact with the wall surfaces 2B and 2C of the mounting groove 2, and front and rear end surfaces 8E and 8F facing the front and rear end sides of the milling body 1, respectively. It has. Accordingly, the side surface 8B intersects the side surfaces 8C and 8D vertically, and the side surface 8C and the side surface 8D are flat surfaces extending in directions parallel to each other. Further, the front and rear end surfaces 8E and 8F of the mounting member body 8 are flat surfaces extending perpendicularly to the side surfaces 8B to 8D and parallel to each other.

  On the other hand, the one side surface 8A of the mounting member body 8 has a mountain shape that gradually protrudes from the side surface 8C, 8D side toward the central portion of the side surface 8A, and the top of the mountain shape opens to the tip surface 8E. A mounting groove 9 extending toward the rear end is formed, and the throw-away tip 3 and the supporter 4 are mounted in the mounting groove 9. However, the mounting groove 9 is formed in the direction of rotation T from the outer peripheral side of the milling body 1 as it goes from the front end surface 8E to the rear end side in a state where the mounting member body 8 is fitted to the mounting groove 2 as described above. It is formed so as to be inclined toward the rear side, and is formed in a stop groove shape that does not reach the rear end surface 8F of the mounting member main body 8, and thereby, on the rear end side of the mounting groove 9 A wall surface 9 </ b> A facing the tip side of the milling body 1 is formed. Further, from the four corners of one side surface 8A of the mounting member body 8 to the other one side surface 8B, the mounting screws 6 are loosely inserted in communication with the screw holes at the four corners of the bottom surface 2A of the mounting groove 2. The through hole is formed so as to avoid the mounting groove 9.

  And, on the rear end side of the other side surface 8B of the mounting member main body 8 of the mounting member 5, a flange 10 protruding from the other side surface 8B is integrated with the mounting member main body 8. The flange portion 10 is formed and contacts the positioning surface 7 of the milling body 1 toward the front end side in the axis O direction in a state where the mounting member body 8 is fitted in the mounting groove 2 as described above. Thus, the mounting member 5 is positioned in the direction of the axis O of the milling body 1, and then the mounting screw 6 as the mounting means inserted through the through hole is screwed into the screw hole. 1 is detachably attached. Here, the distal end surface 10A of the flange portion 10 that contacts the positioning surface 7 is formed at an angle equal to the predetermined angle formed by the positioning surface 7 with respect to the axis O when the mounting member 5 is fitted. Therefore, in the present embodiment, the flat surface is 90 ° with respect to the axis O and perpendicular to the other side surface 8B, and is in close contact with the positioning surface 7 over the entire surface.

  Further, the flange portion 10 is formed in a flat plate shape having a thickness substantially equal to the height from the positioning surface 7 of the wall surface 1C of the milling body 1, and the protruding width from the other side surface 8B is as follows. The difference between the diameter (radius) from the axis O of the milling body 1 to the bottom surface 2A of the mounting groove 2 and the annular inner diameter (radius) formed by the positioning surface 7 is slightly smaller. As shown in FIG. 4, a slight gap is formed between 10 and the wall surface 1 </ b> C of the milling body 1. Further, the rear end surface of the flange portion 10 is flush with the rear end surface 8F of the attachment member main body 8, and in this manner, the flange portion 10 is in contact with the positioning surface 7 and positioned. The tip surface 8E is flush with the outer peripheral side of the tip surface 1A, which is a flat surface perpendicular to the axis O of the milling body 1.

  On the other hand, the supporter 4 to be mounted in the mounting groove 9 of the mounting member 5 is a substantially rectangular flat plate-like member, and the above-mentioned thrower is formed so as to be recessed one step from the rectangular surface at one corner of the rectangular surface. A tip mounting seat 4A on which the away tip 3 is seated is formed. The tip mounting seat 4A is oriented in the rotational direction T and positioned on the outer peripheral side of the tip of the milling body 1 so that the mounting groove 9 rotates. T is seated on the rear side. In addition, a flat-plate-shaped front runout adjustment spacer 11 is detachably attached to the rear end surface 4B of the supporter 4 by means of a mounting screw 11A, and this spacer 11 is in the state where the supporter 4 is seated in the mounting groove 9 above. It is brought into contact with the wall surface 9A and interposed between the wall surface 9A and the rear end surface 4B of the supporter 4. Furthermore, a mounting hole 4C is formed so as to penetrate the supporter 4 from the bottom surface of the chip mounting seat 4A, and the mounting screw 4D loosely inserted into the mounting hole 4C is screwed into the mounting member body 8. The wedge 12 inserted between the one rectangular surface on the rear end side of the mounting groove 9 is pushed into the back side of the mounting groove 9 (inner peripheral side of the milling body 1) by a screw and the one rectangular surface , The supporter 4 is pressed to the rear side in the rotation direction T and is detachably mounted in the mounting groove 9.

  The throw-away tip 3 is formed of a hard material such as a cemented carbide into a substantially rectangular flat plate having a thickness substantially equal to the depth of the tip mounting seat 4A, and the rotation direction with one square surface as a rake face. The corner portion 3A that is formed in one convex arc shape on one of the square surfaces is positioned at the forefront of the outer peripheral side of the milling body 1, and the inner peripheral side of the milling body 1 from the corner portion 3A. The cutting edge 3 </ b> B extending in a straight line is positioned substantially in a plane perpendicular to the axis O, and the other square face opposite to the one square face is brought into close contact with the bottom face of the chip mounting seat 4. . Then, like the supporter 4, the wedge 12 inserted between the one square surface on the tip side of the mounting groove 9 is pushed into the back side of the mounting groove 9 (inner peripheral side of the milling body 1) with a screw. When the one square surface is pressed, the throw-away tip 3 is pressed against the back side in the rotational direction T together with the supporter 4 and is detachably mounted in the mounting groove 9.

  Of the plurality of throw-away tips 3 that are respectively held by the supporters 4 and attached to the plurality of attachment grooves 2 via the attachment members 5, some of the throw-away tips 3a are left as shown in FIG. The corner portion 3A is positioned on the inner peripheral side (left side in FIG. 6) of the milling body 1 with respect to the throw-away tips 3b and 3c, and the cutting edge 3B is positioned slightly on the tip side (lower side in FIG. 6). It is used for finishing blades. Further, among the remaining throwaway tips 3b and 3C, a part of the throwaway tips 3b is located on the inner peripheral side of the milling body 1 and the cutting edge 3B is located on the inner peripheral side of the milling body 1 than the other throwaway tips 3c. Is positioned slightly on the tip side for intermediate finishing, and the throw-away tips 3c other than these finishing and intermediate finishing throw-away tips 3a, 3b are used for roughing. For example, when about 22 to 24 throwaway tips 3 are attached to the milling body 1, one or two throwaway tips 3a and 3b are used for finishing and the remaining 18 to 20 are rough. The throwaway tip 3c for processing is used.

  Among them, the throw-away tips 3b and 3c for intermediate finishing and roughing are formed into a substantially rectangular flat plate of the same shape and size as shown by the solid line in FIG. 4, and the cutting blade 3B as shown in FIG. Is a short range from the corner portion 3A, while the outer peripheral blade 3C extending from the corner portion 3A to the outer peripheral side of the rear end has a longer effective cutting edge length, whereas the throw-away tip 3a for finishing is As shown by a chain line in FIG. 4, the shape is generally a rhombic flat plate, and an obtuse angle portion of one of the rhombus surfaces is a corner portion 3A. The cutting blade 3B extending from the corner portion 3A toward the inner peripheral side of the milling body 1 The finishing and roughing throwaway inserts 3b and 3c are longer than the cutting edge 3B and have a very large curvature curve, while the outer peripheral edge 3C is shorter than the throwaway inserts 3b and 3c. There. Then, as described above, in a large-diameter throw-away type front milling machine that performs surface cutting (black peeling) of an aluminum thick plate material before rolling, among these, the throw-away tip for rough machining 3c located on the outermost periphery side among them. The diameter of the circle formed by the corner portion 3A around the axis O of the milling body 1, that is, the outer diameter of the throw-away type front milling cutter, ranges from about 2 to 3 m.

  In the throw-away type face mill configured as described above, first, the attachment member 5 is detachably attached to the attachment groove 2 formed in the milling body 1, and the throw-away tip 3 and the supporter 4 are connected via the attachment member 5. Since it is attached to the milling body 1, the throwaway tip 3 and the supporter 4 are damaged when an excessive load is applied at the time of cutting, and accordingly the milling body 1 around the throwaway tip 3 and the supporter 4 is disposed. Even if such damage occurs, this damage can be suppressed up to the mounting member 5. By replacing the throw-away tip 3 and the supporter 4 together with the mounting member 5, the milling body 1 itself can be quickly moved as it is. Cutting can be continued with the aim of repair. For this reason, in particular, as in the above-described throw-away type face mill with a large outer diameter, the milling body 1 may be used for heavy cutting with a large cutting amount and a large feed amount per blade, even though it is expensive. Even when a large and excessive cutting load is likely to act, the expensive milling body 1 can be prevented from being damaged, and economical cutting can be achieved.

  Further, in the throw-away type front milling machine having the above-described configuration, a predetermined angle (with respect to the axis O of the milling body 1 is formed around the open groove portion of the mounting groove 2 on the surface 1B facing the rear end side of the milling body 1 ( In the present embodiment, a positioning surface 7 that forms 90 °) is formed, while the mounting member 5 is formed with a flange portion 10 that abuts against the positioning surface 7 toward the tip end side of the milling body 1. The member 5 is positioned toward the front end side in the axis O direction. Accordingly, the position of the cutting edge 3B on the front side of the throw-away tip 3 attached via the attachment member 5 in the direction of the axis O can be reliably and easily disposed at a predetermined position, and thereby the cutting edge 3B. It is possible to ensure a smooth run surface while ensuring the front runout accuracy. Moreover, the mounting groove 2 is formed so as to penetrate the outer peripheral edge of the disc-shaped milling body 1 from the front end surface 1A to the surface 1B facing the rear end side, and the mounting member 5 is fitted into the mounting groove 2 Since the attachment means (attachment screw 6) is attached, the excessive load acts toward the rear end side in the axis O direction, and the attachment member 5 is pushed out to the rear end side. However, the attachment means is broken and the attachment member 5 is detached from the attachment groove 2, so that it is possible to more reliably prevent the milling body 1 from being damaged.

  Moreover, in the mounting member 5 of this embodiment, since the mounting member main body 8 has a substantially rectangular parallelepiped block shape, it is easy to mold, and the side surfaces 8A to 8D and the front and rear end surfaces 8E and 8F are perpendicular to each other. In addition, since the parallelism, the width dimension, the position of the flange portion 10 and the like can be formed with high precision, even when the mounting member 5 is damaged as described above, It is possible to restore the 3B front shake accuracy and the like with good reproducibility. Then, as the mounting member body 8 is formed into a rectangular parallelepiped block shape, the mounting groove 2 of the milling body 1 to which the mounting member body 8 is fitted also has a cross-sectional “U” shape that opens to the outer peripheral side as in this embodiment. Since the side surfaces 8C and 8D of the mounting member body 8 are in close contact with the wall surfaces 2B and 2C of the mounting groove 2, the mounting member 5 can be positioned in the circumferential direction of the milling body 1. Further, it is possible to secure the mounting rigidity of the mounting member 5 to the milling body 1 and to perform machining with higher accuracy even in the case of heavy cutting.

  Further, since the flange portion 10 is formed so as to protrude to the other side surface 8B directed to the inner peripheral side of the milling body 1 other than the side surfaces 8C and 8D of the mounting member body 8, the side surface 8C , 8D can also be formed so that both side surfaces 8C, 8D are parallel to each other and can be accurately fitted between the wall surfaces 2B, 2C without interfering with the protruding collar 10. Further, it is possible to further improve the positioning accuracy and mounting rigidity in the circumferential direction of the mounting member 5 to the milling body 1 described above. In the present embodiment, the bottom surface 2A of the mounting groove 2 and the positioning surface 7 are vertical, and the other side surface 8B and the positioning surface 7 of the mounting member body 8 that is in close contact with the bottom surface 2A. Since the distal end surface 10A of the flange portion 10 that comes into close contact with and abuts is also vertical, the flange portion 10 can be formed to be able to contact the positioning surface 7 with high accuracy even on the side surface 8B. It is possible to reliably ensure the front runout accuracy and the like. However, if the accuracy of the flange portion 10 and the molding accuracy of the side surfaces 8C and 8D can be sufficiently secured, the flange portion 10 is attached to either one of these side surfaces 8C and 8D, or two or all of the side surfaces 8B to 8D. May be formed.

  On the other hand, in the throw-away type face mill of this embodiment, a plurality of mounting grooves 2 are formed on the outer periphery of the milling body 1, and the throw-away tip 3 and the supporter 4 are attached to each through the mounting member 5. On the other hand, the positioning surface 7 is formed in an annular shape around the axis O on the outer peripheral side of the surface 1B facing the rear end side of the milling body 1, and around the rear end side open groove portions of the plurality of mounting grooves 2. It is formed so as to be flush with each other continuously. Therefore, even between the attachment members 5 attached to the plurality of attachment grooves 2, by attaching the attachment members 5 having the same shape and the same dimensions, the positions in the axis O direction can be accurately matched with each other. The front runout accuracy of the cutting edge 3B of the throw-away tip 3 can be further improved. Moreover, such an annular positioning surface 7 can be easily obtained by turning the surface 1B facing the rear end side while rotating the milling body 1 around its axis O in the same manner as when cutting. However, since it can be formed flush with high accuracy, even higher front deflection accuracy can be obtained.

  Further, in the present embodiment, the positioning surface 7 is a flat surface perpendicular to the axis O with an angle of 90 ° with respect to the axis O of the milling body 1, and this positioning is performed by turning as described above. Even when the surface 7 is formed, since it is only necessary to perform a straight turning perpendicular to the axis O, the highly accurate positioning surface 7 can be obtained more easily. However, in this embodiment, the positioning surface 7 is a flat surface perpendicular to the axis O as described above, but may be an inclined surface inclined at an angle other than 90 ° with respect to the axis O. In order to ensure that the flange portion 10 of the mounting member 5 can also come into contact with the positioning surface, the distal end surface 10A may be inclined with respect to the axis O at an angle equal to the angle.

  By the way, in the throw-away type front milling of the present embodiment, among the throw-away tips 3 that are respectively attached to the plurality of attachment members 5, a small number of the throw-away tips 3a are a larger number of the remaining throw-away tips 3b, The cutting blade 3B is positioned closer to the inner peripheral side of the tip of the milling body 1 than 3c and is used for the finishing blade, and among these remaining throwaway tips 3b, 3C, a small number of some throwaway tips 3b The cutting edge 3B is positioned closer to the inner peripheral side of the tip than the other more throwaway tips 3c than this, and is used for intermediate finishing, and more than the above throwing inserts 3a, 3b for finishing and intermediate finishing. In the throw-away tip 3c, the cutting edge 3B is positioned on the rear end side, and the outer peripheral edge 3C is positioned on the outermost peripheral side of the milling body 1. Is to way, there is a for rough machining. Accordingly, along with the rotation and feed of the milling body 1, the large cut portion is cut by the outer peripheral blade 3B exclusively of the outermost peripheral throwing tip 3c on the outermost periphery, followed by inner finishing and finishing on the inner periphery side. The throwaway tips 3b and 3a can finish the cutting surface smoothly. Moreover, since the cutting edge 3B of the finishing throw-away tip 3a has an arc shape with a large curvature radius, it is possible to finish a high-quality cutting surface in which feed marks are not conspicuous.

  Here, in order to adjust the front runout of the cutting blades 3B directed to the tip side (front side) of the milling body 1 of the throwaway tips 3a to 3c in such a manner as to be different from each other in the axis O direction, In addition to making the throw-away tip 3 itself different in shape from the remaining throw-away tips 3b, 3c, such as the finishing throw-away tip 3a, the throw-away tip 3 is kept in the same shape and the same size. The position of the wall surface 9A of the mounting groove 9 in the member 5 is different from that of the other mounting member 5, or the distance between the rear end surface of the supporter 4 that contacts the wall surface 9A and the chip mounting seat 4A is different from that of the other supporter. The size may be different from four. However, if the mounting member 5 and the supporter 4 themselves have different dimensions in this way, the management thereof becomes complicated, and different mounting members 5 and supporters 4 are provided depending on the position of the cutting blade 3B according to the cutting conditions. It is necessary to prepare for one milling body 1, and there is a risk that the cost may be increased.

  Therefore, in the throw-away front milling of the present embodiment, the front runout adjustment spacer 11 is interposed between the wall surface 9A and the rear end surface 4B of the supporter 4 in the mounting groove 9 of the mounting member 5. . Therefore, by making the thickness of the spacer 11 different, even if the mounting member 5 and the supporter 4 are all the same, the position of the cutting edge 3B in the direction of the axis O is varied to adjust the front runout. Therefore, parts management can be simplified, and even when the position of the cutting edge 3B is changed by a cutting condition or the like in one milling body 1, only the spacer 11 is replaced with one having a different thickness. Well, it is extremely economical as compared to preparing the mounting member 5 and the supporter 4 having different dimensions.

It is the figure which looked at the milling body 1 from one end side (front side) showing one embodiment of the present invention. It is ZZ sectional drawing in FIG. It is the elements on larger scale of the outer periphery of the milling body 1 of embodiment shown in FIG. It is the elements on larger scale of the cross section shown in FIG. It is a partial expanded side view of the outer periphery of the milling body 1 of the embodiment shown in FIG. It is an enlarged view which shows the rotation locus | trajectory around the axis line O of the throw away tip 3 (3a-3c) of embodiment shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Milling body 1B The surface which faces the rear end side of the milling body 1 2 Mounting groove 3 Throw away tip 3B Cutting blade which protrudes to the front end side of the milling body 1 of the throwaway tip 3 4 Supporter 4A Tip mounting seat 4B Rear end surface 5 of the supporter 4 Mounting member 6 Mounting screw (Mounting means)
7 Positioning surface 8 Mounting member main body 8A One side surface of mounting member main body 8 8B Other side surface of mounting member main body 8 9 Mounting groove 9A Wall surface facing front end side of mounting groove 9 10 Hook 11 Swing adjustment spacer 12 Wedge O Axis of milling body 1 T Direction of rotation of milling body 1

Claims (5)

  A mounting groove penetrating from the front end to the rear end side of the axial direction of the milling body is formed on the outer periphery of the substantially disc-shaped milling body rotated about the axis, and the milling portion around the rear end opening groove portion of the mounting groove is formed. A positioning surface having a predetermined angle with respect to the axis is formed on the surface facing the rear end of the main body, and an attachment member is fitted in the attachment groove and attached by attachment means. The member is detachably mounted with a throw-away tip having a cutting edge protruding to the tip side of the milling body and a supporter that holds the throw-away tip, and the rear end of the mounting member has the above-mentioned A throw-away type front milling machine characterized in that a flange that contacts the tip end side in the axial direction is formed on the positioning surface of the rear end face of the milling body.   A plurality of the mounting grooves are formed in the milling body, and the throwaway tip and the supporter are attached to each of the mounting grooves via the mounting member, and a surface facing the rear end side of the milling body The throwaway front milling machine according to claim 1, wherein the positioning surfaces of the mounting grooves are formed in an annular shape centering on each other and centering on the axis.   The mounting member is formed with a mounting groove in which the throwaway tip and the supporter are mounted so as to open to a front end surface of the mounting member and a side surface facing the outer peripheral side of the milling body. The throwaway type spacer according to claim 1 or 2, wherein a spacer for adjusting the front runout of the cutting blade is interposed between a wall surface facing the front end side of the blade and a rear end surface of the supporter. Front milling.   It is a mounting member of the supporter used for the front milling machine according to any one of claims 1 to 3, and comprises a mounting member main body of a substantially rectangular parallelepiped block shape fitted into the mounting groove, On one side face directed to the outer peripheral side of the milling body, there is formed a mounting groove that opens to the front end face of the mounting member body and to which the throwaway tip and the supporter are mounted. An attachment member for a supporter, wherein the flange portion is formed so as to protrude from at least one other side surface of the attachment member body. 5. The supporter according to claim 4, wherein the flange portion is formed on another side surface of the mounting member main body facing the inner peripheral side of the milling body opposite to the one side surface. Mounting member.

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