JP2016187837A - Slotter-processing cutting edge member and cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase a feeding speed and a cutting margin while suppressing the movement of a cutting edge member even if cutting resistance is increased, and to enhance cutting efficiency, in slotter processing.SOLUTION: A cutting edge member 101 has a shaft-shaped part 110, a cutting edge 113 is formed of a tip face (rake face) 111 of the shaft shaped part and an external peripheral face, and a flank 115 is formed at the external peripheral face. The shaft-shaped part 110 integrally has a fixed region 120 which is seated in and fixed to a recess 213 of a tip of a holder 201, and is formed into a shape which protrudes from the fixed region 120. When fixing the fixed region 120 to the recess 213 of the holder 201, a reward facing face 132 of the fixed region 120 can be fixed in a form of being constrained by a frontward facing wall face 232 which erects from a seating face of the recess 213. By this fixation, when performing slotter processing by using the tip cutting edge by the relative fore-and-aft movement of the shaft-shaped part 110, the cutting member 101 does not move rearward with respect to the holder 201, and a feeding speed or the like can be thereby increased.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cutting blade member for slotter processing suitable for processing the inner surface (inner peripheral surface) of a hole into a polygon or the like, and in particular, a hexagon socket head bolt or a square hole bolt, As in a screw member (bolt or the like) having a polygonal hole (concave portion) for screwing tool engagement, a cutting blade member suitable for forming a polygonal hole by slotting on its head, and It relates to a cutting tool.

  As a method for forming such a polygonal hole (also simply referred to as a hole), various methods are known such as a method of forming the head portion of a bolt by header processing or press processing (Patent Document 1, 2). However, for example, in a bolt that requires a variety of products and a small amount of production, such as a special bolt that is not a general-purpose product, the hole is formed by slotter processing (also called shaper processing). In this formation, for example, when forming a hexagonal hole, for example, a pilot hole (circular hole) smaller than the opposite side dimension is formed, and the inner peripheral surface of the pilot hole is set to each hexagonal surface (one Each part of the surface sandwiching the corners) is turned to the back of the hole, and then cut away. Of the cutting tools used in this case, the cutting edge member (tip) responsible for actual cutting corresponds to the inner peripheral surface of the hexagonal hole (one corner of the hexagon) on the outer peripheral surface of the tip. What has a flank which consists of two planes with a corner which a cross section intersects at 120 degree | times, and has a front end surface as a scoop surface is used. These two planes and the tip surface constitute a cutting edge, and the crossing edge forms the cutting edge.

  For example, when a hexagonal hole is finished by slotting with such a cutting tool, it is as follows. The cutting tool is fixed to the tool rest of the cutting machine, and the cutting edge portion at the tip of the cutting tool is placed in a prepared hole in the head of the workpiece to be machined (for example, bolt material) with an appropriate cutting allowance. In such an arrangement, the cutting tool is moved back and forth relatively along the axial direction of the pilot hole. In this advancement process, cutting is performed a plurality of times to finish the inner peripheral surface including one corner of the hexagonal hole. In other words, the cutting tool is moved forward in the axial direction for cutting, moved backward to give a new incision (cutting allowance), and then cut back and forth one after another, thereby changing one corner of the hole. An inner peripheral surface portion (predetermined surface including a corner of a square hole) composed of two planes including (stranding) is finished. After finishing one surface in this way, the bolt material is rotated by 60 degrees relative to the axis of the pilot hole, and the above-described cutting is repeated to finish the next one surface. For convenience, a hexagonal hole is formed in the head of one bolt material by repeating such cutting six times. Polygonal hole machining by such slotter machining is performed by cutting, so that accurate and high-precision hole machining can be performed, and even a special hole shape can be machined depending on the shape of the cutting edge.

  However, it is understood that in such a polygonal hole machining by slotter processing, if the hole (for example, a hexagonal hole) is as small as about 3 mm to 5 mm in the opposite side dimension, the pilot hole is further reduced. The cutting edge part constituting the cutting edge at the tip inevitably has an elongated shaft shape. This is because the cutting edge responsible for actual cutting needs to have a shaft shape that can enter the pilot hole. For this reason, in such processing, the two planes intersecting at 120 degrees as described above so as to correspond to the inner peripheral surface of the hole (one corner of the hexagonal hole) on the outer peripheral surface of the tip of the thin shaft portion. A flank having a flank face and a tip face as a rake face is used. As far as the applicant knows, as a cutting tool for drilling such a small polygonal hole, a throw-away type cutting blade member having a slender bar structure (bar-shaped solid type) with an integrated cutting blade is used. There is only. In this case, since the cutting blade member has an elongated bar structure, it is inserted into a hollow portion of a holder having a hollow shaft shape (sleeve shape), and a plurality of clamping screws are provided in the radial direction in the front-rear direction of the holder. A set screw is screwed into the hole from its outer peripheral surface, and the outer peripheral surface of the elongated bar is fixed in a form to be pressed to form a cutting tool, which is fixed to the tool post of the cutting machine and reciprocated as described above. Slotter was being performed.

JP-A-60-177927 Japanese Patent Laid-Open No. 5-192736

  By the way, as mentioned above, the slotter processing is based on cutting, so depending on the shape of the cutting edge, there is a merit that it can be processed with high precision even if it is a small square hole or complicated shape, but header processing or Unlike press processing, there are disadvantages that the number of processing steps increases and costs increase. Such a difficulty is to increase the forward (reciprocating) speed of the cutting tool to shorten the time required for the forward / backward movement, or to increase the cutting margin (incision amount) in one forward movement, This is improved by reducing the number of times of the cutting process.

  However, in the cutting tool using the above-described elongated bar structure (bar-shaped solid type) cutting blade member, as described above, this is inserted into the hollow portion of the holder having a hollow shaft shape, and is stopped before and after the holder. It is solidified by screwing in the screw and pressing the outer peripheral surface of the elongated bar. For this reason, when the hexagonal hole to be processed is as small as 3 mm to 5 mm or less in the opposite side dimension, a sufficient fixing force in the holder of the bar cannot be obtained. This is because in such a small hole drilling, the thickness of the bar is narrower than the opposite dimension, so the fixing force obtained with the set screw is small, and even if a thick set screw is used, the contact Since the pressure side is small, there is a limit to its fixing force.

  On the other hand, in the slotter processing using such a cutting tool, as understood from the processing form, a large force is applied to the cutting edge member of the bar structure in the axial direction by the cutting resistance. The cutting resistance increases as the work piece becomes difficult to cut, such as a high-strength material or high-hardness material. Therefore, when the advancement speed (feeding speed) of the cutting tool is increased, the cutting resistance increases correspondingly. To do. The same can be said for increasing the machining allowance per time. As a result, when it is attempted to increase the machining efficiency with such an improvement measure, the fixed and slender cutting blade member (bar) may be displaced or moved rearward in the axial direction within the holder without resisting the cutting resistance. is there. For this reason, in a cutting tool having a fixed structure using such a cutting blade member, there is an early limit to increasing the feed rate or increasing the machining allowance, and there is a problem that the machining efficiency cannot be increased. . In addition, when using such a bar-structured cutting edge member, it is conceivable that the rear end is structurally stopped with a stopper separately in the holder, but in this way, the cutting edge is only at one end of the bar. Since it is not provided (two blades cannot be obtained), the cost increases in that sense, which is not practical.

  According to the present invention, in the slotter processing as described above, it is a small polygonal hole processing, and even if there is an increase in cutting resistance, there is no movement of the cutting blade member, thereby increasing the feed rate or cutting. We provide a cutting blade member for slotter processing that can increase the machining allowance and increase the machining efficiency as a new shape and structure that is completely different from the conventional one, and also provide a cutting tool using this The purpose is to do.

The present invention as defined in claim 1 has a shaft-like portion, a cutting edge is formed by the tip surface and the outer peripheral surface, a rake face is provided at the tip surface, and a cutting for slotter processing having a flank surface on the outer peripheral surface. A blade member,
The shaft-shaped portion is integrally provided with a fixing portion for being seated and fixed in the concave portion in a holder provided with a concave portion for fixing the cutting blade member on the side of the tip, and the shaft-shaped portion is It is formed in a shape protruding from the fixing portion.
According to a second aspect of the present invention, the fixing portion has a polygonal plate shape or a columnar shape, and the shaft-like portion is one side of the polygon that is connected to the corner at the corner of the polygon or a portion near the corner. And the cutting edge is formed such that the flank faces the same direction as the side surface of the fixing portion that forms the one side. It is a cutting blade member for slotter processing of Claim 1 characterized by the above-mentioned.

In the present invention according to claim 3, when the clearance angle of the flank is α, the reference straight line L1 that should be used as a reference for the clearance angle α, and the angle formed by the one side of the fixing portion is β, The cutting blade member for slotter processing according to claim 2, wherein both corners are in a relation of β> α.
According to a fourth aspect of the present invention, there is a round fillet formed as a recess at a corner angle formed by a surface of the shaft portion protruding from the fixing portion and an outer peripheral surface of a root portion of the shaft portion. It is attached, It is a cutting blade member for slotter processing of any one of Claims 1-3 characterized by the above-mentioned.

In the present invention according to claim 5, the number of the shaft-shaped portions is two, and when the fixing portion is seated in the concave portion, the two shafts when viewed from above the seating surface in the concave portion. The cutting blade for slotter processing according to any one of claims 1 to 4, wherein the shape of the entire cutting blade member including the shape portion is point-symmetrical or substantially point-symmetrical. It is a member.
The present invention described in claim 6 is characterized in that the cutting edge is a cutting edge for drilling a polygonal hole, and the cutting edge for slotter processing according to any one of claims 1 to 5 is provided. It is a blade member.

A seventh aspect of the present invention relates to the slotter member for slotter processing according to any one of the first to sixth aspects, and a holder provided with a concave portion for fixing the cutting blade member at a side portion of the tip. A cutting tool comprising:
The recessed portion rises from the seating surface together with a seating surface for projecting the shaft-shaped portion of the cutting blade member from the recess toward the tip of the holder and seats the bottom surface of the securing portion, and the securing portion At least one forward facing wall, and the fixing portion includes at least one forward wall that can stop moving backward in the recess,
The cutting blade member is projected into the concave portion of the holder, the shaft-shaped portion is projected from the concave portion toward the tip of the holder, and the bottom surface of the fixing portion is seated on the seating surface of the concave portion, and the rearward direction A surface is restrained and fixed by the forward wall surface.
In the present invention, the backward-facing surface with respect to the fixing portion refers to the rear side when the cutting blade member is fixed to the holder and is divided into either the rear side or the front side of the holder. The surface that becomes.

  In the cutting blade member for slotting according to the present invention, the shaft-shaped portion is fixed to be seated and fixed in the concave portion in the holder provided with the concave portion for fixing the cutting blade member on the side of the tip. Is integrated. For this reason, when this fixing part is seated and fixed in the concave part of the holder, the rearward facing surface of the fixing part is restrained by the forward wall surface rising from the seating surface of the concave part. This can be fixed by clamping means. Thereby, when slotting is performed with the cutting edge at the tip of the shaft-like portion of the shaft-like portion of the cutting edge member, the cutting edge member is moved backward with respect to the holder by the cutting resistance. Can be prevented. The rearward facing surface of the fixing portion may be not only 1 (one surface) but 2 (two surfaces) or more. A known fixing (clamping) means may be used to fix the cutting blade member to the concave portion of the holder. For example, in the case where a screw hole is provided in the seating surface (chip seating surface), the known fixing means includes a screw (clamp screw) used for fixing the fixing portion and a hole corresponding to the head. It may be provided, or a holder of a pressing method using a presser may have a shape and structure corresponding to the holder.

  Thus, according to the cutting blade member for slotter processing of the present invention, it is provided with a fixing portion that protrudes the shaft-like portion provided with the cutting edge at the tip, and the rearward facing surface of this fixing portion is provided. Since the holder can be restrained and fixed by the forward-facing wall surface of the recess, the holder can be fixed in such a manner that the rearward movement is structurally stopped. As described above, in the present invention, like a conventional cutting blade member for slotting with a bar structure, it is completely different from a fixing structure that is inserted into a hollow portion of a hollow shaft holder and fixed by screwing an outer peripheral surface. In contrast, the cutting edge member is not displaced rearward with respect to the holder due to the cutting resistance generated when the shaft-like portion is moved forward and backward relative to the holder (back and forth movement) and cutting with the cutting edge at the tip during advancement. There is no movement. For this reason, basically, unless the cutting edge of the cutting blade member is broken or the like due to cutting resistance, the cutting speed can be increased or the cutting amount (cutting allowance) can be increased. , Processing efficiency can be increased.

  In the present invention, the cutting blade member for slotter processing, as long as the shaft portion is integrally provided with a fixing portion, and it is formed so as to protrude from the fixing portion, the protruding position etc. It is not limited. This is because, as long as the fixing portion is integrally provided on the shaft-like portion, the rearward movement as described above is caused in the concave portion of the holder via the rearward facing surface that will be present in the fixing portion. This is because it is only necessary to obtain fixation in a state without any. For this reason, for example, in the case where the solid portion has a polygonal plate shape (or columnar shape), the shaft-like portion is one of the polygons that are the surface (surrounding side surface) of the solid portion. The intermediate portion of the side (side surface) may be formed so as to protrude perpendicularly or inclined to the surface (plane), but the shaft-shaped portion may be formed at the polygonal corner or the corner-side portion. It is good to form in the shape which protrudes from this fixing | fixed site | part along the one side of the polygon which continues to a corner.

  In this case, as described in claim 2, the cutting edge is preferably formed such that the flank faces the same surface as the side surface of the fixing portion that forms the one side. Originally, it is not limited to which surface of the outer peripheral surface of the shaft portion the flank that forms the cutting edge faces. This is because the shaft-shaped portion is rotated around its axis or positioned by rotating the work piece so that machining can be performed in accordance with the position of the flank that forms the cutting edge, and this is positioned at an appropriate angle (hole This is because the desired cutting can be performed by moving the shaft portion relatively forward and backward by repeating the rotation at an angle corresponding to the number of polygons. However, according to claim 2, the shape of the cutting edge (the shape in the cross section of the shaft portion of the flank) on the tip surface (rake surface) of the shaft portion is a polygonal hole to be processed. Even if it is not a simple shape such as two planes sandwiching a corner for machining the corner of the corner, it is easy to form a flank including the cutting edge, that is, in the manufacture of the cutting edge member itself, even if it is complicated It is.

  Such a cutting edge member is inevitably formed from a cutting tool material that is a high-hardness material or high-strength material (with or without a coating, such as a cemented carbide alloy). The finish of the cutting edge forming surface including such as is usually a polishing finish with a diamond grindstone. Then, after forming the pilot hole, for example, when slotting two surfaces sandwiching one corner of the hexagonal hole, the shape when the cutting edge at the tip of the shaft portion is viewed from the tip surface side, that is, The cross-sectional shape of the flank on the outer peripheral surface of the shaft-shaped portion is that having two planes intersecting at 120 degrees (shaft-shaped portion). In this case, the flank itself in the manufacture of the cutting edge member is formed and finished in two planes, but each of them is a plane, so that each rotating grindstone (circular grindstone) is replaced with the outer peripheral surface of the grindstone. By repeating traversing (feeding) in a direction crossing the shaft-like portion, desired surface polishing can be performed, so there is no particular problem.

  However, when the hole to be slotted is not a simple hexagonal hole but a hexalobular hole like a hexagonal star (polygonal star), the flank face is It corresponds to one corner (dent) of the hexagonal star-shaped hole and becomes a surface sandwiching the corner, so that the flank surface is a curved surface that is concave in the cross section. That is, the so-called cutting edge (flank) shape used for processing a special hole shape is a simple V where two straight lines intersect when viewed from the rake face side (when the shaft portion is viewed from the tip). The shape corresponding to one corner angle in the hexagonal star-shaped hole (hexalobular hole) is not a shape, but a convex shape, and a complex shape that is a curved surface in which two surfaces sandwiching one corner angle are concave. . For this reason, such a flank finish cannot be achieved by polishing by simple feed using a circular grindstone as described above. Therefore, in order to form such a flank, the shape of the outer peripheral surface of the grindstone (rotary grindstone) is formed into a curved V-groove shape corresponding to the flank, and this grindstone is formed at the front and rear (longitudinal) of the shaft-like portion. It is efficient to move and polish along the direction. In this case, if the flank has the configuration described in claim 2, the grindstone can be moved without greatly interfering with the fixing portion, so that the polishing can be performed without any problem. Moreover, even if there is interference, the polishing can be performed by polishing the outer peripheral surface of the fixing portion together.

  Further, in order to avoid such interference or unnecessary polishing of the fixing portion, the clearance angle of the flank is defined as α, and a reference straight line that should be used as a reference for the clearance angle α as described in claim 3. When the angle between L1 and the one side of the fixing part is β, it is preferable that both angles have a relationship of β> α. By setting such an angular relationship, the one side of the fixing portion is in a positional relationship with respect to the flank face in the shaft-like portion, so that such a polishing interference problem can be avoided. However, the angle α is preferably in a range of 5 degrees ≦ α ≦ 15 degrees. The clearance angle may be 5 degrees or more, but depending on the protruding length (length) and thickness of the shaft-shaped part, and the strength (machinability) of the work material, 20 degrees may be used. If it seems to exceed, the cutting edge (cutting edge) tends to be lowered in rigidity or broken, and chattering is likely to occur on the finished surface. In order to improve the rigidity and strength, as described in claim 4, a surface from which the shaft-shaped portion protrudes from the fixing portion, and an outer peripheral surface at a root portion of the shaft-shaped portion, It is preferable that a corner (arc R) fillet that is a recess is attached to the corner formed by However, R (unit: mm) is preferably set in a range of 0.3 ≦ R ≦ 1.5. If it is less than 0.3 mm, the improvement in rigidity and strength is small. On the other hand, if it exceeds 1.5 mm, the length of the shaft-like portion is greatly reduced, and the depth is reduced by drilling a small inner diameter (for example, about 3 mm). This is because it is disadvantageous for deep hole machining.

  The shape of the fixing portion that forms the cutting blade member for slotter processing in the present invention is not limited, and the number of the shaft-shaped portions may be one or more, as described in claim 5. The whole of the cutting blade member including the two shaft-shaped portions when viewed from above the seating surface in the recess when the fixing portion is seated in the recess and the shaft-shaped portion is two. It is preferable that the shape of this is point-symmetric or substantially point-symmetric. If it is 2 or more, the cost per cutting edge can be reduced, and it can be said that it is suitable as a throw-away cutting edge chip. However, having two cutting edges makes the shape and structure complicated. This is because the handling and the like are simple without incurring, and if the shape is point-symmetric, it is easy to set up processing such as positioning of the cutting edge. The cutting blade member for slotter processing of the present invention is suitable for the cutting blade member having a polygonal cutting blade as described in claim 6, but on the outer peripheral surface of the shaft member. It can be widely applied to slotter processing.

  According to the cutting tool of Claim 7 using the cutting blade member for slotter processing of this invention, an efficient slotter processing is performed with respect to a holder, without a cutting blade member moving back with cutting resistance. It is clear from the above that this is possible. That is, when the cutting blade member for slotter processing is fixed to the concave portion of the holder, the rear facing surface is fixed by being restrained by the forward facing wall surface that prevents the rearward movement. As described above, the cutting tool according to claim 7 using the slotting member for slotter processing of the present invention is compared with a hollow shaft holder like the conventional cutting blade member for slotting processing of a bar structure. Because it is not fixed by screwing and fixing the outer peripheral surface by being inserted into the hollow portion, the bar (cutting blade member) itself slides backward due to cutting resistance with respect to the holder. There is no. For this reason, compared with such a conventional cutting tool, the cutting speed can be increased, or feeding with an increased cutting amount can be performed, so that the machining efficiency can be increased accordingly.

  In the present invention, the cutting blade member may be constrained by a forward-facing wall surface that rises from the seating surface of the concave portion of the holder on the rearward facing surface in the fixing portion, and the rearward movement may be stopped. For this reason, when the rearward facing surface in the fixing part is pushed rearward by the cutting resistance, it matches the position and orientation of the other party's forward wall surface so that the pressing force can be received by the forward wall surface. What is necessary is just to set as 1 or 2 or more things. In other words, the forward-facing wall surface of the recess may be aligned with the rearward facing surface of the fixing site, or the rearward facing surface may be formed in conformity with the forward-facing wall surface, so that the cutting blade member can be prevented from moving backward.

1 shows Embodiment 1 embodying the present invention, a cutting blade member for slotter processing, and a cutting tool formed by fixing the cutting blade member to a recess for fixing a cutting blade member on the side of the tip of the holder. The principal part expansion perspective view. It is a figure explaining the cutting blade member currently used in the embodiment of FIG. 1, Comprising: A is the axial part which has a cutting blade at the front-end | tip in the corner of the fixing | fixed site | part which makes a polygonal plate shape. The front view explaining the state which protrudes so that it may follow, and the enlarged view of a cutting-blade part, B is the left view of A, Comprising: The figure which looked at the cutting edge from the rake face side, and the expansion of a cutting-blade part Drawing C is a bottom view of A, and is the figure which looked at a cutting edge from the flank side, and an enlarged view of a cutting edge part. A is a figure explaining a xalobular hole, B is a figure when the shaft-like part at the time of setting it as the cutting edge for processing of a xalobular hole is seen from a front end surface (rake face side). The figure when the axial part at the time of setting it as the cutting edge for processing of a square hole is seen from the front end surface (rake face side). The perspective view of only the holder in FIG. It is explanatory drawing (figure corresponding to FIG. 2-A) of the cutting tool which fixed the cutting blade member of FIG. 2 to the holder, Comprising: A is the site | part for fixing which makes a polygonal plate shape on the upper surface side (above a seating surface). The principal part enlarged view when it sees from, B is the left view of A, C is a bottom view of A. The figure explaining another example of a cutting blade member (figure corresponding to Drawing 2-A). The figure explaining another example of a cutting blade member (figure corresponding to Drawing 2-A). The figure explaining another example of a cutting blade member (figure corresponding to Drawing 2-A).

  Embodiments embodying the present invention will be described in detail with reference to FIGS. In the drawing, reference numeral 101 denotes Embodiment 1 of the cutting blade member, and a tip (surface) 111 of the shaft-like portion 110 is provided with a cutting edge 113 for hexagonal hole machining. Although the details will be described later, the cutting blade member 101 is fixed to a recess 213 for fixing the cutting blade member provided on a side portion of the tip 210 of a rod-shaped (or shaft-shaped) holder 201 by, for example, screwing and cutting. Used as a tool for slotting. The cutting blade member 101 is a plate-shaped member having a fixed shape with a polygonal fixed portion 120 for fixing by being seated on a seating surface (bottom surface) of a recess (pocket) 213 provided in the holder 201. There is a setting in which the bottom surface (lower surface in FIG. 2C) 123 of the fixing portion 120 is seated on the seating surface of the recess 213 and fixed. Hereinafter, first, the cutting blade member 101 will be described in detail. In addition, regarding the fixing portion 120, the rearward facing surface is divided into the surface facing the rear side or the front side of the holder 201 when the cutting blade member 101 is fixed to the holder 201 as described above. The surface that faces the back (right side of FIG. 2-A).

  The fixing portion 120 in the cutting blade member 101 of this example is a hexagonal shape having two acute corners close to a right angle in a diagonal direction when viewed from above the seating surface when fixed to the recess 213. It is a plate-like thing (refer FIG. 2-A). And in each acute angle corner or a portion near the corner, the shaft portion 110 is integrally formed so as to protrude from the peripheral surface (side surface) of the fixing portion 120 along one side of the polygon continuous to the corner. Yes. In this example, the overall shape including the two shaft-like portions 110 is a point-symmetric shape as shown in FIG. Hereinafter, in this example, among the peripheral surfaces forming the sides of the plate-shaped hexagon forming the fixing portion 120, the peripheral surface from which the shaft-shaped portion 110 protrudes is referred to as a first surface 131, and in FIG. The circumferential surfaces that are connected clockwise from the first surface 131 are referred to as a second surface 132 and a third surface 133, respectively. In addition, when the cutting blade member 101 of this example is fixed to the holder 201, it is the first surface 131 to the third surface 133 that are connected in the clockwise direction to form the rearward facing surface. Therefore, these are referred to as the first rearward facing surface 131, the second rearward facing surface 132, and the third rearward facing surface 133 as appropriate according to their ordinal numbers. And

  In the center of the fixing portion 120, a hole with a counterbore (circular hole) is used to fix (clamp) the screw hole provided in the seating surface of the recess 213 of the holder 201 by a screwing method using a screw (clamp screw). ) 125 penetrates in the thickness direction of the plate. The peripheral surface of the fixing portion 120 (the outer peripheral surface on the thickness side of the plate) is a bottom surface with respect to the counterbore side surface 127 of the hole 125 (hereinafter, also referred to as the upper surface or simply the upper surface). A gradient (-11 degrees to 11 degrees) is provided over the entire circumferential direction so that 123 is slightly smaller or slightly larger. In addition, although mentioned later for details, in this example, among such outer peripheral surfaces (the 1st surface 131 to the 3rd surface 133), the 2nd back facing surface 132 which is two outer peripheral surfaces, and the 1st which is not a back facing surface. The three surfaces (third front-facing surfaces) 133 are set to be restrained by wall surfaces 232 and 233 rising from the seating surface of the recess 213 of the holder 201, respectively.

  The cutting blade member 101 of this example is provided with the two shaft-shaped portions 110 as described above, and both are the same size at the same position in the middle in the plate thickness direction on the peripheral surface of the fixing portion 120. It is provided in a protruding shape with the same shape and structure (see FIGS. 2-B and C). The shaft-like portion 110 has a cutting edge 113 formed by the tip surface 111 and the outer peripheral surface 115, and therefore the tip surface 111 is a rake face (rake face 111), and the outer peripheral face 115 is a flank face (flank face). 115) Eggplant. In this example, since the cutting edge 113 is for hexagonal holes (regular hexagonal holes), two planes where the flank 115 side intersects with a 120-degree V-shape in the cross section of the shaft-shaped portion 110. The cutting edge 113 is formed by these two flat surfaces and the rake face 111 (the front end face of the shaft-like portion 110). As a result, the cutting edge of the cutting edge 113 (the ridgeline where the two flank surfaces 115 and the rake face 111 intersect) exhibits a V-shape of 120 degrees when viewed from the rake face 111 (the tip face of the shaft 110). (See FIG. 2-B). The shape of the rake face (transverse section of the shaft-shaped portion 110) 111 is a pentagon including this V shape in this example, and continues to the root of the shaft-shaped portion 110. Of the pentagon, the cross section of the portion (shaft-like portion 110) that does not form the 120-degree V-shape forming the cutting edge 113 may be an appropriate shape as long as there is no problem in cutting or strength. In addition, in the corner angle formed by the outer peripheral surface of the root portion where the shaft-shaped portion 110 protrudes from the surface (first surface 131) of the fixing portion 120 and the surface (first surface 131) of the fixing portion 120, A round fillet 135 is formed as a concave (see FIGS. 2-A and B).

  In this example, as described above, the shaft portion 110 has a peripheral surface (first surface 131) of the fixing portion 120 so as to be along one side of the polygon connected to the corner at the corner or the corner-closed portion. ) Is formed so as to protrude from the peripheral surface (third surface 133) of the fixing portion 120 where the flank 115 forms one side thereof. . In this example, the shaft portion 110 protrudes at a right angle to one side of the polygon on the first surface 131. On the other hand, in the slotter processing, the shaft portion 110 is set to be moved back and forth in the axial direction. As shown in FIG. 2A, the flank 115 has a clearance angle α, and is fixed. When the working part 120 is viewed from the upper surface 127 (see FIG. 2A), the V-shaped corner of the root flank 115 of the shaft 110 is substantially flush with the acute corner of the fixing part 120. Is set to The clearance angle α is based on a straight line (reference straight line L1) drawn at right angles to the first surface 131 when viewed from the upper surface 127, but in this example, the protruding direction of the shaft-shaped portion 110 is used. The surface (third surface) 133 forming one side of the polygon along the line is in a relation of β> α, where β is an angle (inclination angle) formed with the reference straight line L1. Specifically, the clearance angle α is about 2 degrees and β is about 10 degrees. The rake face 111 has an appropriate rake angle.

  Such a cutting blade member 101 for slotter processing is a recess for fixing the cutting blade member provided on the side of the tip 210 of the holder 201 as shown by a two-dot chain line in FIGS. It is fixed to 213 to become a cutting tool, which is used for slotting. That is, the cutting blade member 101 of this example is configured so as to restrain, for example, the second rearward-facing surface 132 and the third surface (third forward-facing surface) 133 in the fixing portion 120. Using the holder 201 provided with the concave portion 213 where the wall surfaces 232 and 233 rise from the seating surface at the side of the tip 210, the second rearward facing surface 132 and the third surface 133 in the fixing portion 120 are connected to the respective wall surfaces 232 of the concave portion 213. , 233, and a screw (clamp screw) 50 is inserted through a hole 125 provided in the fixing portion 120 and screwed into a screw hole provided in the seating surface to be fixed as a cutting tool. In such an example, the wall surface 232 in the recess 213 that restrains the second rearward facing surface 132 is the forward wall surface. Thereby, as shown in FIG. 2A, the cutting blade member 101 of this example has the holder 201 in view of its fixing structure even if an external force F acts backward from the tip of the shaft-like portion 110. However, it does not move backward. For this reason, when a polygonal (hexagonal) hole is formed by slotting with this cutting tool, the cutting resistance (main cutting force) generated when the shaft 110 is advanced forward. However, the cutting blade member 101 does not move backward with respect to the holder 201 during the cutting process.

  For this reason, in the slotter processing by the cutting tool using the cutting blade member 101 of this example, the cutting speed can be increased as long as the cutting edge 113 of the cutting blade member 101 is not broken due to cutting resistance, or Since feeding with an increased cutting amount (cutting allowance) can be performed, machining efficiency can be increased accordingly. In addition, in this example, the corner of the round that is concave with respect to the corner formed by the outer peripheral surface of the root portion where the shaft-shaped portion 110 protrudes from the fixing portion 120 and the surface (first surface 131) of the fixing portion 120 is formed. Since the meat 135 is attached, since the stress concentration at the base is reduced, the risk of breakage at the base is low.

  Further, in the cutting edge member 101 of this example, since the flank 115 is composed of two planes in the formation and finishing of the flank 115 itself in the shaft-like portion 110, the rotating grindstone (circular grindstone) is used as the grindstone. By repeating traversing (feeding) in the direction in which the outer peripheral surface of the shaft traverses the shaft-shaped portion 110, desired planar polishing can be performed. However, the following polishing finish is also possible. That is, in this example, the shaft-like portion 110 is formed in a shape that protrudes along one side of a polygon that is connected to the corner at a polygonal acute corner or a corner-side portion forming the fixing portion 120. At the same time, the cutting edge 113 is formed so as to face the same direction as the side surface (the third surface 133) of the fixing portion 120 where the flank 115 forms one side. Thereby, by forming the outer peripheral surface shape of the grindstone (rotary grindstone) into a 120-degree V-groove shape corresponding to such a flank 115, and sending the grindstone along the axial direction of the shaft-shaped portion 110, The flank 115 can be polished. Such a polishing finishing method can be said to be an extremely efficient polishing method in the processing of xalobular holes in which the holes to be processed are hexagonal star-shaped holes as follows.

  FIG. 3A shows an example of the Xalobular hole 30. When such a cutting edge for drilling is used, the cutting edge must have a shape corresponding to the shape of the hole. Therefore, the cutting edge 113b has a cutting edge shape as shown in FIG. 3-B when the shaft-like portion 110 in the above example is viewed from the tip surface (rake face 111 side). In other words, the cutting edge 113b for processing the xylobular hole 30 does not have a simple V shape in which two straight lines intersect when viewed from the rake face 111 side, but one corner in the hexagonal star-shaped xylobular hole 30. A portion corresponding to the corner 33 is formed as a convex 33b, and has a complicated shape called a curved V-groove shape in which a cutting edge shape to be processed on two surfaces sandwiching one corner 33 is concave. Therefore, the shape of the flank 115 in the shaft-like portion 110 is also continuous in this shape toward the root. In the above example, even in such a case, the flank 115 forming the cutting edge 113 is formed along the side surface (third surface 133) in the fixing portion 120 and facing the same direction as the side surface. An outer peripheral surface shape of a grindstone (rotary grindstone) is formed in a curved V-groove shape corresponding to such a flank 115, and the flank 115 is fed by feeding the grindstone along the axial direction of the shaft-shaped portion 110. Can be polished finish. Therefore, the warp polishing finish becomes easy regardless of the flank shape. In particular, in this example, as described above, the angles α and β on the flank 115 side are in a relationship of β> α, so unnecessary polishing of the third surface 133 of the fixing portion 120 can be minimized.

  If the polygonal hole to be processed is a quadrangle, as shown in FIG. 4, the shape of the cutting edge 113 when the shaft 110 is viewed from the rake face 111 side is 90 degrees in the cross section. What is necessary is just to consist of two planes which cross | intersect. Thus, the shape seen from the rake face side of the cutting edge may be a shape that can obtain a polygonal hole shape or the like to be processed. In addition, when the target of slotting is to form key grooves or spline grooves on the outer peripheral surface of the shaft, the shaft having a cutting edge formed in a cutting edge shape or the like according to the cross-sectional shape of the machining (groove) to be processed The shape portion may be used.

  Here, based on FIG. 5 and FIG. 6, an example of an embodiment of the holder 201 for fixing the cutting blade member 101 of the present example and the cutting tool 301 using both of them will be described. The fixing means of the cutting blade member 101 will be described in detail. The holder 201 is a base for forming a round bar (cylindrical body). A flat surface 221 in which one side of the tip 210 is cut away by a plane parallel to the axis of the round bar is used to fix the cutting blade member as follows. A recess 213 is provided. The concave portion 213 has, on the flat surface 221, one axial portion 110 of the cutting blade member 101 that is coaxial with the holder 201 from the concave portion 213 and protrudes forward from the tip 210, together with the other axial portion 110. The upper surface 127 of the fixing part 120 is positioned so as to be flush with or slightly above the flat surface 221 so as to be received. In this example, the concave portion 213 has a seating surface 215 for seating the bottom surface 123 of the fixing portion 120 at the time of positioning, and the second rearward facing surface 132 and the rearward facing surface among the side surfaces of the fixing portion 120. As described above, the two wall surfaces 232 and 233 rising from the seating surface 215 are provided so as to restrain the three surfaces 133.

  That is, in this example, when the concave portion 213 is viewed from above the seating surface 215 (see FIG. 6A), the shaft-shaped portion 110 projects forward along the axis of the holder 201, and the state , The second rearward facing surface 132 and the third surface 133 are constrained so as to include two wall surfaces 232 and 233 rising from the seating surface 215. A wall surface 232 that restrains the second rearward facing surface 132 (forward-facing wall surface 232) plays a role of mainly stopping the fixing portion 120 from moving backward in the recess 213, and the other wall surface 233 is mainly positioned. It plays a role. The forward wall surface 232 is provided with an inclination of 45 degrees with respect to the axis G of the holder 201 when the recess 213 is viewed from above the seating surface 215, and the other wall surface 233 has an inclination angle β of the third surface 133. Is provided with an inclination of 10 degrees with respect to the axis G of the holder 201. In addition, this recessed part 213 is cut | disconnected and opened by the predetermined | prescribed width | variety at the outer peripheral surface of the holder 201 toward diagonally back along this 45 degree | times inclination (refer FIG. 5). Further, in both wall surfaces 232 and 233, the portion near the seating surface 215 rises at a right angle to the seating surface 215, but the portion near the flat surface 221 has an inclination corresponding to the inclination of the peripheral surface of the fixing portion 120. It has been. Further, in this example, screw holes 217 are provided at corresponding portions of the seating surface 215 in order to fix the fixing portion 120 by screwing.

  In such an example, the shaft-shaped portion 110 of the cutting blade member 101 is protruded from the tip of the recess 213 (the tip 210 of the holder 201) toward the tip of the recess 213 of the holder 201. The bottom surface 123 of the part 120 is seated on the seating surface 215 of the recess 213. At that time, the rearward facing surface (second rearward facing surface 132) in the fixing portion 120 is restrained by the inclined forward wall surface 232 and the third surface 133 is restrained by the other wall surface 233. The screw (clamp screw) 50 is passed through the hole 125 and screwed into the screw hole 217. Thereby, the cutting blade member 101 is fixed to the recessed part 213 of the holder 201, and becomes the cutting tool 301 shown in FIG. Such a cutting tool 301 is fixed to the tool rest of the processing machine via the holder 201, and is driven so that the shaft-shaped portion 110 moves relatively back and forth together with the tool rest. A desired hole is formed in the prepared hole provided in the head of the bolt material by slotting. In such a machining process, even if a large force due to cutting resistance acts on the shaft-like portion 110, the cutting blade member 101 does not move backward with respect to the holder 201 as described above. It is possible to improve the machining efficiency or to increase the machining allowance.

  In the above example, the polygonal shape of the fixing portion 120 in the cutting blade member 101 is a hexagonal shape having two acute angles in the diagonal direction. However, like the cutting blade member 102 of another example shown in FIG. In addition, a rhombus-shaped fixing portion 120 in which the second surface in the above example is eliminated may be used. In the embodiment of FIG. 7, the polygonal shape of the fixing portion 120 is different from that in the above example, and the first rearward facing surface 131 is indicated by a two-dot chain line in the drawing. The second surface 131 that is constrained by the tip-facing wall surface 232 that extends in the direction perpendicular to the axis G of the holder 201 and that does not become the rearward-facing surface is constrained by another wall surface 233. Therefore, when the cutting blade member 102 is fixed to the recess 213, it is structurally clear that the first rearward-facing surface 131 is restrained by the front-end-facing wall surface 232 and the backward movement of the holder 201 is stopped. It is. In FIG. 7, although there is only one shaft-like portion 110, the other portions are not fundamentally different from the above example. Therefore, the same reference numerals are given to the same or corresponding parts in the figure as in the above example. The description is omitted. The same applies to other examples below. In this case, when the inclination angle β is not applied as in the above example, the fixing portion 120 is simply square as in another example (another example) of the cutting blade member 103 shown in FIG. It is good.

  Further, like the cutting edge member 104 of another example shown in FIG. 9, the shaft-like portion 110 may be projected at the center of one side when the shaft-like portion 110 is a rectangular fixing portion 120 in a top view. Further, in each of the above examples, the fixing portion 120 has a polygonal plate shape, but this may be a polygonal columnar shape instead of a plate shape, or a shape other than a polygonal shape. The shape is not limited and can be embodied as an appropriate shape and structure.

101, 102, 103, 104 Cutting blade member 110 for slotter processing Shaft-shaped portion 111 Tip surface (rake face) of shaft-shaped portion
113 Cutting edge 115 Outer peripheral surface (flank) of shaft-shaped part
120 fixing part 123 bottom surface 131, 132, 133 of fixing part rearward facing surface 201 of fixing part 201 holder 210 tip of holder,
213 Recess 215 for fixing the cutting blade member Seating surface 232 of the recessed portion for fixing the cutting blade member Front-facing wall surface 301 Cutting tool α Relief angle L1 Reference straight line β to be used as a reference for the escape angle α Reference straight line L1 and projecting shaft shape Angle G formed by one side (third surface) of the polygon along which the part extends

Claims (7)

A cutting blade member for slotter processing having a shaft-shaped portion, having a cutting edge at its front end surface and outer peripheral surface, having a rake face at its front end surface, and a flank on the outer peripheral surface,
The shaft-shaped portion is integrally provided with a fixing portion for being seated and fixed in the concave portion in a holder provided with a concave portion for fixing the cutting blade member on the side of the tip, and the shaft-shaped portion is A cutting blade member for slotter processing, wherein the cutting blade member is formed so as to protrude from the fixing portion.   The fixing portion has a polygonal plate shape or columnar shape, and the shaft portion protrudes from the fixing portion so as to be along one side of the polygon connected to the corner at the corner of the polygon or a portion near the corner. The cutting edge is formed in such a manner that the flank faces the same direction as the side surface of the fixing portion that forms the one side. The cutting blade member for slotter processing as described.   When the clearance angle of the flank is α, and the reference straight line L1 that should be used as a reference for the clearance angle α and the angle formed by the one side of the fixing portion is β, the two angles satisfy the relationship β> α. The cutting blade member for slotter processing according to claim 2, wherein the cutting blade member is provided.   A corner fillet formed by the surface where the shaft-shaped portion protrudes from the fixing portion and the outer peripheral surface of the root portion of the shaft-shaped portion is provided with a round fillet which is a recess, The cutting blade member for slotter processing according to any one of claims 1 to 3.   The number of the shaft-shaped portions is two, and when the fixing portion is seated in the recess, the entire cutting blade member including the two shaft-shaped portions when viewed from above the seating surface in the recess. The cutting blade member for slotter processing according to any one of claims 1 to 4, wherein the shape is point-symmetric or substantially point-symmetric.   The cutting blade member for slotter processing according to any one of claims 1 to 5, wherein the cutting blade is a polygonal cutting blade. A cutting tool comprising: the cutting blade member for slotter processing according to any one of claims 1 to 6; and a holder provided with a concave portion for fixing the cutting blade member on a side portion of a tip. ,
The recessed portion rises from the seating surface together with a seating surface for projecting the shaft-shaped portion of the cutting blade member from the recess toward the tip of the holder and seats the bottom surface of the securing portion, and the securing portion At least one forward facing wall, and the fixing portion includes at least one forward wall that can stop moving backward in the recess,
The cutting blade member is projected into the concave portion of the holder, the shaft-shaped portion protrudes from the concave portion toward the tip of the holder, and the bottom surface of the fixing portion is seated on the seating surface of the concave portion, and the rearward direction A cutting tool characterized in that a surface is restrained and fixed by the forward-facing wall surface.

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