JP2012143860A - Inner diameter working tip and inner diameter working cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensively manufacturable inner diameter working cutting tool high in the brazing strength of a cutting edge tip.SOLUTION: The inner diameter working cutting tool T includes a rod-like tool body 2, and the cutting edge tip 4 with a lower face attached to the tool body 2 and having a cutting edge protruded from the tool body 2 toward the side thereof. The inner diameter working tip 1 in which some parts of lower and upper faces of the cutting edge tip 4 are sandwiched by the tool body 2, and some parts of the lower and the upper faces of the cutting edge tip 4 are brazed to the cutting tool 2 is attached to a holder 100.

Description

  The present invention relates to an inner diameter machining tip and an inner diameter machining cutting tool suitable for inner surface machining of a small-diameter hole including the same.

  As a cutting tool for inner diameter processing that processes the inner surface of a hole, for example, as in Patent Document 1, a shape in which a cutting blade is formed on the side of the tip of a rod-shaped body is widely used. Cutting tools with such shapes tend to have smaller cutting edges to accommodate small-diameter machining, and there are many forms in which the cutting blades reach the end of their lives with little damage to other parts, and more efficient usage is desired. Yes.

  On the other hand, in Patent Documents 2 and 3, a cutting edge portion having a cutting edge protruding to the side made of a hard sintered body such as a single crystal diamond tip or cBN at the tip of a tool body (tool neck, shank) is brazed. An attached inner diameter machining cutting tool is disclosed.

JP 2001-066022 A JP 2004-188518 A Japanese Patent Laid-Open No. 02-106203

  However, in the method of brazing the cutting edge portion to the tool body as in Patent Documents 2 and 3, in order to drill a small diameter, when the diameter of the tool body is small, the brazing area of the cutting edge portion is small. The brazing strength is reduced and the cutting edge portion may be peeled off during cutting.

The inner diameter machining tip of the present invention, a rod-shaped tool body,
A cutting edge tip having a cutting edge with a lower surface attached to the tool body and protruding laterally from the tool body;
And a part of the lower surface and the upper surface of the cutting blade tip is sandwiched between the tool main bodies, and a part of the lower surface and the upper surface of the cutting blade tip are brazed to the tool main body.

  The inner diameter machining tip of the present invention can be formed of an inexpensive alloy steel or the like, and the tool body from which the cutting edge chip brazed to the tool body is removed can be recycled. Can be manufactured at low cost. In addition to the lower surface (and preferably also the side surface) of the cutting edge tip, the upper surface is sandwiched and brazed by the tool body, so that the cutting edge tip can be brazed to the tool body even if the inner diameter of the tool body is reduced. The strength is high, and peeling of the cutting edge tip from the tool body can be suppressed.

1 shows an example of an inner diameter machining tip of the present invention, (a) a perspective view of a tool body before inserting a cutting edge tip of an inner diameter machining tip, (b) a perspective view of a main part, (c) a plan view, (D) It is a side view. An example of the cutting tool for internal diameter processing which mounted | wore the internal diameter processing chip | tip of FIG. 1 with the holder is shown, (a) Perspective view, (b) Side perspective drawing. It is a tip view of the tip for internal-diameter processing which attached the cutting edge tip of (a)-(d) to the tool main part. An example of the cutting edge chip | tip brazed to the chip | tip for internal diameter processing of FIG. 1 is shown, (a) Perspective view, (b) Plan view. (A)-(c) is a schematic diagram (perspective view and side view) which shows an example of the joining method of the cutting edge chip | tip brazed to the chip | tip for internal diameter processing of FIG.

  1 to 4, an inner diameter machining cutting tool T that is used by mounting an inner diameter machining tip (hereinafter sometimes referred to as a chip) 1, which is an embodiment of the present invention, to a holder 100. Will be described. 1A is a perspective view of a tool body before inserting a cutting edge tip of an inner diameter machining tip, FIG. 1B is a perspective view of a main part, FIG. 1C is a plan view, and FIG. 2A and 2B show an example of a cutting tool for inner diameter processing in which the chip 1 is mounted on the holder 100, and FIG. 2A is a perspective view and FIG. FIG. 3 is a front view of the inner diameter machining tip having a cutting edge tip attached to the tool body, and is a view in which the inner diameter machining tips having the bottom surface shape shown in FIGS. FIG. 4 shows an example of a cutting edge tip brazed to the tool body of the inner diameter machining tip, (a) a perspective view and (b) a plan view.

  The chip 1 shown in FIGS. 1 and 2 has cutting edges 3 (3A, 3B) protruding laterally from both ends of each end of a rod-shaped tool body 2. Further, the cutting edge tip 4 (4A, 4B) is brazed to the tip of the tool body 2 (the side where the cutting edge is used for cutting in FIGS. 4B) is partly sandwiched between the tool body 2 and the lower surface 16 and the upper surface 18. In other words, a cutting edge tip mounting portion 13 (13A in the drawing) for inserting the cutting edge tip 4 (4A, 4B) is provided at the tip of the tool body 2, and this cutting edge tip placement portion 13 ( 13A) is inserted and brazed with the cutting edge tip 4 (4A). That is, the cutting edge chip mounting portion 13 is a space surrounded and surrounded by the lower surface brazing surface 11, the side surface brazing surface 12, and the upper surface brazing surface 14 formed at the tip of the tool body 2. According to the present invention, the side surface of the cutting edge chip mounting portion 13 is not the side brazed surface 12 and may not be brazed.

  A part of the upper surface 18 of the cutting edge tip 4 (4A, 4B) is brazed to the tool body 2 by the upper fixing portion 5 (5A, 5B). The upper surface brazing surface 14 is constituted by the lower surface of the upper fixing portion 5. Here, in FIGS. 1 and 2, the brazed portion of the upper surface 18 of the cutting edge tip 4 (4A, 4B) is the rear of the upper surface 18 of the cutting edge tip 4 (4A, 4B) away from the cutting edge 3. This is the part, in other words, the center side of the tool body 2. That is, the cutting edge tip 4 (4A, 4B) is sandwiched between the rear side of the lower surface 16 and the rear side of the upper surface 18 (portion close to the center of the tool body) between the tool body 2 and the lower surface of the tool body 2 The entire lower surface 16 of the cutting edge tip 4 (4A, 4B) sandwiched between the brazing surface 11 and the upper surface brazing portion 14 is placed on the lower surface brazing surface 11 of the tool body 2 and the upper surface of the cutting edge tip 4 (4A, 4B). The rear of 18 is brazed to the upper brazing surface 14 of the tool body 2.

  The side surface of the tool body 2 is basically such that the portion inserted into the hole of the work material to be machined during cutting causes the abrasive to contact the rod-shaped tool body 2 while rotating the rod-shaped tool body 2. The portion polished by so-called cylindrical polishing is polished in the short direction of the rod-shaped tool body 2, that is, in the direction perpendicular to the central axis of the rod-shaped tool body 2 on the side surface of the tool body 2. Abrasive streaks are formed. Thereby, the processing man-hour at the time of manufacturing the chip | tip 1 can be reduced, and it can manufacture cheaply. Moreover, with the brazing configuration described above, even if the inner diameter of the tool body 2 is reduced, the brazing strength is high, and peeling of the cutting edge tip 4 can be suppressed.

The cutting edge tip 4 (4A, 4B) includes, in order from the tip, a cutting edge 3 (3A, 3B), a rake face 7 (7A, 7B), and a chip pocket 8 (8A, 8B). Yes. The chip pocket 8 has an effect that the chips generated by the cutting blade 3 are temporarily stored, and the chips are gradually discharged from the gap between the inner wall surface of the work material and the chip 1. Therefore, even when a large amount of chips are temporarily generated, it is possible to prevent the chips from being clogged near the cutting edge 3 and being unable to cut. In the configuration of the present embodiment, the cutting edge tip 4 (4A, 4B) includes not only the cutting edge 3 (3A, 3B) and the rake face 7 (7A, 7B) but also the chip pocket 8 (8A, 8B). Since the area is wide, it is possible to increase the brazing area and increase the brazing strength.

  Here, it is desirable that a part of the side of the tool body 2 including at least a portion where the cutting edge tip 4 is brazed is formed with a polishing streak in a rod-like short direction, that is, cylindrically polished. Thereby, the polishing process is easy and the chip 1 can be manufactured at low cost. Moreover, in FIG. 1, although the relief part 10 which notched the rod-shaped tool main body 2 is formed in the side surface by the side of the brazing tool tip 2 of the tool main body 2 being brazed, this relief part 10 is not necessarily required. However, it may be appropriately formed according to the case where the brazing material is exposed by brazing or a large amount of chips are generated.

  In addition, according to FIGS. 1 and 2, the upper surface 18 of the cutting edge tip 4 (4A, 4B) has an outer periphery toward the brazed portion, closer to the tip (cutting blade) side than the brazed portion. An inclined surface 6 (6A, 6B) is formed to protrude to the side. In addition, a part of an inclined surface 6 (6A, 6B) that protrudes toward the outer periphery toward the rear is formed on the front surface of the upper fixing portion 5 (5A, 5B). And a part of the cutting edge tip 4. The front surface of the upper fixing portion 5 (5A, 5B) that functions as the inclined surface 6 (6A, 6B) functions as a chip breaker. Fixing part for positioning and fixing to the holder 100 by bringing the other inclined surface 6B or the terminal corner part 9B into line contact with the positioning member 102 formed on the holder 100 when cutting using the cutting blade 3A It has become.

  With this configuration, the inclined surface 6B provided at the rear end of the chip 1 or the terminal corner portion 9B thereof can be positioned in direct linear contact with the positioning member 102 provided in the holder 100. In this method, a flat portion is provided on the outer peripheral surface of the shank as in a conventional chip, and the flat portion is fixed by screwing the flat member from the outer periphery of the holder with the shank inserted into the holder. Compared with, the positioning accuracy when restraining the vertical position (core height direction) and the length direction of the cutting edge of the chip 1 is high and the rotation of the chip 1 at the time of fixing can be suppressed without loosening the screw. . The upper fixing portion 5 is not limited to the one formed integrally with the tool main body 2 as shown in FIGS. 1 and 2, and the upper fixing portion 5 is formed separately from the tool main body 2. Also good.

  As shown in FIG. 3, the shape of the tip 1 is such that the bottom surface 16 of the cutting edge tip 4 is (a) a plane, (b) an inclined surface, (c) a V-shaped surface, and (d) a bottom surface as viewed from the tip of the tip 1. Any shape such as a convex curved surface whose center protrudes toward the brazing surface 11 may be used.

  On the other hand, as shown in FIG. 2, the inner diameter machining cutting tool T with the chip 1 mounted on the holder 100 is provided with an insertion hole 101 into which the chip 1 is inserted at the tip of the holder 100, and the chip 1 is inserted into the insertion hole 101. Is inserted and fixed from the side opposite to the end where the cutting edge 3A used for cutting is formed. In FIG. 2B, a positioning member 102 is provided in the insertion hole 101 to be in contact with the inclined surface 6B of the chip 1 or its terminal corner 9B (inclined surface 6B in FIG. 2). On the side surface of the holder 100, a large number of positioning member mounting holes 103 for inserting the rod-shaped positioning members 102 are provided. A rod-shaped positioning member 102 is inserted into one positioning member mounting hole 103 among the positioning member mounting holes 103. The reason why a large number of positioning member mounting holes 103 are provided is that the protruding amount of the chip 1 can be adjusted appropriately.

The positioning member 102 only needs to be in contact with the inclined surface 6 of the chip 1 such as a pin or a screw material or the terminal corner portion 9 thereof, and has a rod shape, such as a polygonal column such as a cylinder or a triangular column. A shape may be sufficient and it will not be restrict | limited especially if there exists the surface which faced the cutting edge 3A side of the front-end | tip in the axial direction of the tool main body 2. FIG. Since the pins can be easily inserted and removed, the protruding amount of the chip 1 can be easily changed.

  Here, according to FIG. 2, in addition to the positioning member 102, in addition to the positioning member 102, the insertion hole 101 extends from the outer peripheral surface of the holder 100 to the tip end side of the holder 100 in order to suppress chipping and rattling. A screw hole 104 penetrating the screw hole 104 is formed, a screw member 105 is screwed into the screw hole 104, and the outer peripheral surface of the tool body 2 of the chip 1 is pressed and fixed at the tip of the screw member 105. In addition, according to FIG. 2, the positioning member attachment hole 103 and the screw hole 104 are formed in a direction orthogonal to each other when viewed from the front end. At this time, it is desirable that the outer peripheral surface of the tool body 2 to be in contact with the screw member 105 is a curved surface. That is, when the tool main body 2 is brought into contact with the screw member 105 in a plane, the chip 1 is rotated and attached due to the influence of manufacturing variation, and the attachment position may be out of order.

  Further, as shown in FIG. 4, the cutting edge tip 4 (4 </ b> A, 4 </ b> B) has a lower surface brazing surface 11, a side surface brazing surface 12 and an upper surface brazing surface 14 formed at the tip of the tool body 2. The lower surface 16, the side surface 17, and the upper surface 18 of the cutting edge tip 4 (4 </ b> A, 4 </ b> B) are respectively fitted to the chip mounting portion 13, and the lower surface brazing surface 11 and the side surface brazing formed at the tip of the tool body 2. A structure in which the brazing surface 12 and the upper surface brazing surface 14 are brazed is desirable in terms of increasing brazing strength. Further, it is desirable from the viewpoint of improving brazing strength that the side surface 17 is composed of three surfaces 17a, 17b, and 17c, and each is brazed to the side brazing surface 12 of the tool body 2. Further, a counterbore 15 may be formed at the rear ends of the lower surface 16 and the side surface 17 for collecting the brazing material remaining in the back of the cutting edge chip mounting portion 13 so as not to protrude outside.

  1 and 2 are formed by disposing the cutting blade tips 4 on both ends of the rod-shaped tool body 2 to form the two cutting blades 3, but the present invention is limited to this configuration. Instead, the cutting edge tip 4 may be arranged only at one end of the rod-shaped tool body 2.

  In addition, it is desirable that the cutting edge tip 4 (4A, 4B) is made of a hard sintered body and that the tool body 2 is made of metal or alloy steel because the tip 1 can be manufactured at low cost. As the hard sintered body, cemented carbide, cermet, ceramics, diamond and cBN are preferably applicable, and as the metal or alloy steel, high speed steel and hardened steel are also suitably applicable. On the other hand, when the brazing alloy is Ti—Cu or Ti—Cu—Ag alloy, the bonding strength can be further increased. In particular, it is possible to braze with high bonding strength using an active brazing alloy containing Ti as an active metal.

  Here, in order to produce the inner diameter machining tip 1, first, as shown in FIG. 5A, a cutting edge tip mounting portion for inserting the cutting edge tip 4 (4 </ b> A, 4 </ b> B) into a predetermined position at the tip. The tool body 2 provided with 13 is formed by grinding or die cutting, and a predetermined position on the outer peripheral surface of the rod-shaped tool body 2 is cylindrically processed. Either the cutting blade tip placement portion 13 or the outer peripheral surface may be processed first. On the other hand, the cutting edge tip 4 is formed by forming and firing a raw powder for a hard sintered body to be the cutting edge tip 4.

And as shown in FIG.5 (b), the cutting blade chip | tip 4 is mounted in the cutting blade chip | tip mounting part 13 of the tool main body 2, and it brazes with a brazing material. Here, the upper fixing portion 5 is formed integrally with the tool body 2 as shown in FIGS. 1 and 2, and the upper fixing portion 5 is attached to the cutting blade tip mounting portion 13 when the cutting blade tip 4 is brazed. May be brazed at the same time. Alternatively, a separate upper fixing portion may be placed at a predetermined position on the upper surface of the brazed cutting edge tip 4, and the upper fixing portion may be brazed to the tool body 2 and the cutting edge tip 4 with a brazing material. .

  After that, as shown in FIG. 5C, the cutting blade 3 is processed in a state where the inclined surface 6 of the chip 1 or the terminal corner portion 9 thereof is in contact with the positioning member 103 of the holder 100, and the position of the cutting blade Adjust the shape. The shape of the cutting edge tip 4 may be a shape having a thin thickness in the vicinity of the cutting edge 3 from the beginning and having an inclined surface in the rear, but directly from FIG. 5 (a) without going through FIG. 5 (b). It is also possible to move to FIG. That is, when brazing the cutting edge tip 4, the thickness in the vicinity of the cutting edge 3 is also formed with the same thickness as the rear thickness, and after brazing, the vicinity of the cutting edge 3 is polished to a predetermined thickness. Also good.

1 Inner diameter machining insert (chip)
2 Tool body 3 (3A, 3B) Cutting edge 4 (4A, 4B) Cutting edge tip 5 (5A, 5B) Upper fixed part 6 (6A, 6B) Inclined surface 7 (7A, 7B) Rake surface 8 (8A, 8B) ) Chip pocket 9 (9A, 9B) End corner portion of inclined surface 10 Relief portion 11 (11A, 11B) Lower surface brazing surface 12 (12A, 12B) Side brazing surface 13 (13A, 13B) Cutting edge chip mounting portion 14 (14A, 14B) Upper surface brazing surface 15 (15A, 15B) Counterbore 16 Lower surface 17a, 17b, 17c Side surface 18 Upper surface 100 Holder 101 Insertion hole 102 Positioning member 103 Positioning member mounting hole 104 Screw hole 105 Screw member T Cutting tool

Claims (10)

A rod-shaped tool body;
A cutting edge tip having a cutting edge with a lower surface attached to the tool body and protruding laterally from the tool body;
An inner diameter machining tip in which a part of the lower surface and the upper surface of the cutting blade tip is sandwiched by the tool body, and a part of the lower surface and the upper surface of the cutting blade chip are brazed to the tool body .   2. The inner diameter machining tip according to claim 1, wherein a polishing bar is formed on at least a part of a side surface of the tool body in a direction intersecting with a longitudinal direction of the tool body.   The internal cutting edge tip according to claim 1 or 2, wherein the cutting edge tip includes the cutting edge, a rake face, and a chip pocket.   The inner diameter machining tip according to any one of claims 1 to 3, wherein the cutting edge tip is brazed to both ends of the tool body.   On the upper surface of the cutting edge tip, an inclined surface that protrudes toward the outer peripheral side toward the brazed portion is formed, and the other inclined surface is formed when cutting is performed using one of the cutting blades. 5. The inner diameter machining tip according to claim 4, wherein the terminal corner is fixed by making line contact with the holder.   At the end of the tool body, there are provided a lower brazing surface, a side brazing surface, and an upper brazing surface that are brazed to the lower surface, the side surface, and the upper surface of the cutting tip, respectively, 6. The inner diameter machining tip according to claim 1, wherein the inner diameter machining tip is fitted and brazed into a chip mounting portion surrounded by the brazing surface.   The inner diameter machining tip according to claim 6, wherein three side brazing surfaces exist at an end of the tool body.   8. The inner diameter machining tip according to claim 1, wherein the cutting edge tip is made of a hard sintered body, and the tool body is made of metal or alloy steel.   An inner diameter machining cutting tool comprising: the inner diameter machining tip according to any one of claims 1 to 8; and a holder having the insertion hole for inserting the inner diameter machining tip and fixing the tool body.   The inner diameter machining cutting tool according to claim 9, wherein the inner diameter machining tip is inserted into an insertion hole of the holder and fixed from an end opposite to an end on which a cutting blade used for cutting is formed.

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