JP2014034066A - Insert and cutting tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insert having satisfactory chip discharge property and a cutting tool equipped with the same.SOLUTION: An insert 1 comprises: a nearly rod-shaped shank part 2 having a nearly circular shape when viewed from the tip; and a cutting blade part 3 provided at the tip of the shank part 2. The cutting blade part 3 has a breaker 6 provided on a rake face 5 continuing to a cutting blade ridge line 4. The shank part 2 has a first shank part 2a adjacent to the cutting blade part 3 and a second shank part 2b which is adjacent to the first shank part 2a and has a diameter larger than that of the first shank part 2a when viewed from the tip. The second shank part 2b has a notched groove 9, which extends on the extension of the breaker 6 when viewed from the top, at the tip on the side of the cutting blade part 3.

Description

  The present invention relates to an insert having a cutting edge at the tip of a substantially rod-shaped shank, and a cutting tool for mounting the insert on a holder.

  Conventionally, as a cutting tool used for bore boring and grooving of an inner diameter, a substantially rod-shaped insert (hereinafter simply referred to as an insert) having a cutting edge portion is inserted into a hole of a holder and fixed by tightening with a bolt. Are known.

  For example, Patent Documents 1 and 2 disclose a cutting tool in which a substantially rod-shaped insert having a cutting edge portion at the tip is inserted into the hole from the tip of the holder, and the insert is fixed with a screw member that penetrates the holder. Using this cutting tool, insert from the cutting edge part of the insert to a part of the shank part into the machining hole of the work material to perform inner diameter machining and groove insertion processing to form a groove in the machining hole. It has been known.

Japanese Utility Model Publication No. 05-04403. Japanese Utility Model Publication No. 05-070808

  However, in the cutting tools of Patent Documents 1 and 2, chips are generated by cutting, but the chips are difficult to be discharged out of the processing holes of the work material, and sometimes clogged in the processing holes.

  The objective of this invention is providing the insert and cutting tool which can improve the chip | tip discharge | emission property in the internal-diameter processing of a workpiece, or grooving in a processing hole.

The insert of the present invention is substantially rod-shaped, and includes a shank portion having a substantially circular shape when viewed from the tip, and a cutting edge portion provided at the tip of the shank portion,
The cutting edge portion has a breaker provided on a rake face following the cutting edge ridge line,
The shank part includes a first shank part adjacent to the cutting edge part, and a second shank part adjacent to the first shank part and having a diameter larger than that of the first shank part when viewed from the tip.
The second shank portion has a notch groove extending at the tip of the cutting blade portion side and extending on the extension of the breaker when viewed from above.

  Moreover, the cutting tool of this invention inserts the said insert in the elongate insertion hole provided in the front end side of the holder, and is being fixed.

According to the insert of the present invention, the tip of the second shank part having a larger diameter than the first shank part adjacent to the cutting blade part is extended on the extension of the breaker of the cutting blade part in a top view. By having a notch groove, it is possible to suppress clogging of chips generated at the time of cutting in the machining hole of the work material, and to be next to the first shank portion where the chip is inserted into the work material. After passing, it can be smoothly discharged to the rear along the notch groove.

It is a perspective view about one embodiment of an insert of the present invention. It is (a) top view of the insert of FIG. 1, (b) side view, (c) tip view. FIG. 3 is a perspective view of a cutting tool in which the insert shown in FIGS. 4A is a top view, FIG. 4B is a perspective view seen from the side, and FIG. 4C is a front view of the cutting tool of FIG. 3. It is a schematic diagram for demonstrating an example of the manufacturing method of the insert of FIG.

  1 and 2 which are one embodiment of the insert 1 of the present invention, and FIGS. 3 and 4 which are one embodiment of a cutting tool 30 for grooving which is used by attaching it to the holder 20. To do.

In FIG. 1, the insert 1 is provided with a shank portion 2 having a substantially rod shape and having a substantially circular shape when viewed from the tip, and a cutting blade portion 3 following the tip of the shank portion 2. The shank part 2 is a first shank part 2a adjacent to the cutting edge part 3, and a second part that is adjacent to the first shank part 2a and protrudes closer to the cutting edge part 3 than the first shank part 2a in the front end view. It consists of a shank part 2b.

  The cutting edge portion 3 has a cutting edge ridgeline 4 and a rake face 5 extending from the tip to the outer periphery, and a corner 4a between the tip and the outer periphery of the cutting edge ridgeline 4 is the tip of the first shank portion 2a. It protrudes outward from the outer periphery. In addition, the corner 4a is located inside the outer periphery of the second shank portion 2b in the front end view. 2A, a part of the cutting edge ridge line 4 extends in a direction parallel to the central axis O of the shank portion 2, and is parallel to the central axis O of the shank portion 2 of the cutting edge ridge line 4. A groove 42 having an outer peripheral surface parallel to the machining hole 41 can be formed in the machining hole 41 of the work material 40 as shown in FIG. Although the 1st shank part 2a and the 2nd shank part 2b have the same central axis, the 1st shank part 2a becomes the shape where the cutting blade part 3 side was notched.

  A breaker 6 is provided along the cutting edge ridge line 4 on the rake face 5 of the cutting edge portion 3. According to the top view in FIG. 2A, the breaker 6 extends along the cutting edge ridge line 4 in a direction parallel to the central axis O of the shank portion 2. According to the front end view of FIG. 2C, the breaker 6 is a concave curved surface. A flank is provided on the side opposite to the rake face 5 of the cutting edge ridgeline 4, and the cutting edge ridgeline 4 on the side of the central axis O with respect to the corner 4a forms a lateral flank (not shown). A rear flank 7 is formed on the rear side of 4a.

  And the notch groove 9 extended on the extension of the breaker 6 by the top view is provided in the front-end | tip of the 2nd shank part 2b. By this notch groove 9, the chips generated by the cutting edge portion 3 pass smoothly next to the first shank portion 2 a in the machining hole of the work material, and then smoothly pass backward through the notch groove 9. Discharged. As a result, it is possible to suppress chips from being clogged in the machining hole of the work material. As will be described later, when the coolant hole 28 is provided in the holder 20 and the coolant is supplied from the coolant injection port 29 toward the cutting edge portion 3, the coolant efficiently passes through the notch groove 9. Therefore, the cooling effect during cutting is enhanced.

Moreover, in this embodiment, the breaker 6 and the notch groove 9 are each in a direction parallel to the central axis O of the shank portion 2 as shown in the top view of FIG. As shown in the side view, both have a concave curved surface, two concave curved surfaces exist on one arc R, and the flow of chips is smoother. As shown in FIG. 5, the insert 1 having such a shape can be easily manufactured by polishing the breaker 6 and the notch groove 9 of the insert 1 with the same disk-shaped grindstone 50. In other words, the two concave curved surface breakers 6 and the notch grooves 9 are formed by a partial arc R of a virtual circle machined by the disc-shaped grindstone 50.

  Furthermore, in this embodiment, the polishing bar 10 is provided on the surface of the breaker 6 in a direction parallel to the central axis O of the shank portion 2. Chips generated by grooving are pushed out from the cutting edge ridge line 4 in a direction perpendicular to the central axis O of the shank portion 2 on the rake face 5, but the abrasive stripes 10 in the direction perpendicular to the moving direction of the chips are formed of chips. The chip is bent more strongly by the polishing bar 10 because it has an effect of preventing the passage. As a result, since the chips are finely curled and cut, it is possible to suppress the chips from being clogged in the vicinity of the cutting blade portion 3. In this embodiment, the surface of the notch groove 9 is also provided with a polishing bar 11 in a direction parallel to the central axis O of the shank portion 2, and the polishing bar 11 flows the chips discharged from the work material. Demonstrates the effect of smoothly discharging chips without obstructing.

  On the other hand, as shown in FIGS. 3 and 4, the holder 20 is provided with a long insertion hole 21 into which the insert 1 is inserted from the distal end of the long holder 20. A positioning member 22 that is in contact with the inclined surface 8 is provided.

  Moreover, according to FIGS. 1-3, the inclined surface 8 is provided in the end opposite to the edge part in which the cutting blade part 3 was provided, and insert 1 is inserted in the insertion hole 21 of the holder 20 from the inclined surface 8 side. Then, the positioning member 22 provided in the holder 20 contacts and is fixed so that the inclined surface 8 comes into contact with the line. According to this configuration, the positioning of the cutting blade of the insert 1 in the longitudinal direction and the rotation direction is easy and the accuracy is increased.

  According to FIG. 3, the outer peripheral surface of the holder 20 on the tip (first end) side of the holder 20 other than the positioning member 22, in addition to the positioning member 22, in order to suppress the dropping and rattling of the insert 1. A screw hole 24 penetrating from the insertion hole 21 to the insertion hole 21 is formed, and a screw member 25 is screwed into the screw hole 24 so that the outer peripheral surface of the shank portion 2 of the insert 1 is pressed and fixed at the tip of the screw member 25.

  In FIG. 3, a plurality of positioning member mounting holes 23 for inserting rod-shaped positioning members 22 are provided on the side surface of the holder 20. A rod-shaped positioning member 22 is inserted into one of the positioning member mounting holes 23 among the positioning member mounting holes 23. The reason why a large number of positioning member mounting holes 23 are provided is that the amount of protrusion of the insert 1 can be adjusted as appropriate. The positioning member 22 only needs to be in contact with the inclined surface 8 of the insert 1 such as a pin or a screw material, and has a rod shape, and may be any shape such as a cylindrical column, a polygonal column such as a triangular column, or the like. There is no particular limitation. Since a pin can be easily inserted and removed, the amount of protrusion of the insert 1 can be easily changed. In this embodiment, a pin is used as the positioning member 22. The positioning member 22 is also provided so that the axis of the positioning member 22 is perpendicular to the longitudinal direction of the insertion hole 21.

  The positioning member 22 is fixed by a method in which both ends of the cylindrical pin are clamped and fixed, or a screw in which one side end portion of the cylindrical pin is threaded and the threaded portion is provided in the holder 20. A method of screwing into a cut portion, a method of fixing one end of a cylindrical pin with a taper shape having an enlarged diameter, and abutting and fixing the tapered portion to a predetermined position of the positioning member mounting hole 23, and fixing the cylindrical pin with an adhesive And a method of tightening and fixing the screw member from the side surface of the cylindrical pin.

The position of the positioning member 22 in the insertion hole 21 may be appropriately adjusted according to the insertion angle of the inclined surface 8 of the insert 1. The inclined surface 8 of the insert 1 and the positioning member 22 are brought into contact with each other so that they come into contact with each other. For example, when the positioning member 22 is a cylindrical pin, the insert 1 is mounted on the holder 20. The direction perpendicular to the longitudinal direction of the inclined surface 8 and the direction perpendicular to the longitudinal direction of the holder 20 on the outer peripheral surface of the positioning member 22 are configured to be parallel to each other. Thereby, stable and strong restraint is possible.

  As shown in FIGS. 3, 4 (b) and (c), the holder 20 includes a coolant hole 28 for supplying a coolant therein. 4C, at least two injection holes 29a and 29b for the coolant hole 28 are provided independently of the insert insertion hole 21. As shown in FIG. That is, the injection ports 29 a and 29 b and the insert insertion hole 21 are not connected in the front end view of the holder 20. In this embodiment, the shortest width Δt between the injection ports 29a and 29b and the insert insertion hole 21 is 0.005 to 5 mm. Further, the centers of the two injection ports 29a and 29b are located above the center of the circle when the insert insertion hole 21 is viewed from the tip. As a result, the traveling direction of the coolant sprayed from the two spray ports 29a and 29b is shifted downward due to gravity, so that the sprayed coolant drops on the shank portion of the insert at a high rate, and then the shank portion. Flows to the cutting edge side of the tip. Moreover, part of the coolant injected from the two injection ports merges and the traveling direction is bent in the direction toward the tip, so that the rate at which the coolant is supplied to the cutting edge portion 3 is further increased. A part of the rear of the coolant hole 28 is connected to a portion where the hole diameter of the insert insertion hole 21 is increased. Moreover, since the injection port 29 of the coolant hole 28 is provided independently of the insert insertion hole 21, when the insert 1 is inserted into the holder 20 from the insert insertion hole 21, the injection port 29 interferes with the insert 1. Is not caught on the inner wall surface of the insert insertion hole 21, and the insertion and removal of the insert 1 is smooth.

  Here, according to FIGS. 4 (a) and 4 (b), the tip shape of the holder 20 has a convex curve portion 26 that protrudes outward in a side view, and an injection port 29a, 29b is provided. That is, the front end shape of the holder 20 is wide in the rearward direction as viewed from the side, and has a curved line on the front end side or a straight line with no corners. In other words, the holder 20 has no corner at the tip. Thus, when coolant (cutting fluid) is supplied from the holder 20 toward the insert 1, as shown in FIG. 4B, the position of the injection port 29 is such that the upper side is rearward and the lower side is shifted from the front. Become. With this shape, the traveling direction of the coolant injected from the injection port 29 is corrected upward, so that it is possible to reduce a deviation amount in which the traveling direction of the coolant is shifted downward due to gravity.

  In addition, when the inner diameter is processed, the coolant supplied from the upper side of the non-rotating insert 1 is below the insert 1 when the inner end of the processing hole of the rotating work material is closed. Since it is discharged out of the machining hole of the work material through the side, the circulation of the coolant is good. Therefore, chips generated during cutting can be smoothly discharged out of the system.

  Moreover, although FIGS. 1-4 demonstrated the structure of the insert 1 in which the cutting blade part 3 was provided only in one edge part of the shank part 2, this invention is not limited to this, For example, a cutting The present invention can also be applied to inserts having blade portions provided at both ends of the shank portion 2.

DESCRIPTION OF SYMBOLS 1 Insert 2 Shank part 3 Cutting edge part 4 Cutting edge ridgeline 4a Corner 5 Rake face 6 Breaker 7 Side relief face 8 Inclined face 9 Notch groove 10 Polishing bar 20 Holder 21 Insertion hole 22 Positioning member 23 Positioning member attachment hole 24 Screw hole 25 Screw member 26 Convex curve portion 28 Coolant hole 29 (29a, 29b) Injection port 30 Cutting tool 40 Work material 41 Work hole 42 Groove O Center axis of shank portion

Claims (5)

It is substantially rod-shaped and comprises a shank portion that is substantially circular when viewed from the tip, and a cutting edge portion provided at the tip of the shank portion,
The cutting edge portion has a breaker provided on a rake face following the cutting edge ridge line,
The shank part includes a first shank part adjacent to the cutting edge part, and a second part adjacent to the first shank part and partially protruding toward the cutting edge part from the first shank part as viewed from the front end. With a shank part,
The second shank part is an insert having a notch groove extending on an extension of the breaker in a top view at a tip of the cutting blade part.   The insert according to claim 1, wherein each of the breaker and the notch groove forms a concave curved surface in a direction parallel to a central axis of the shank portion, and the two concave curved surfaces are on one arc.   The insert according to claim 1 or 2, wherein a polishing bar in a direction parallel to a central axis of the shank portion is provided on a surface of the breaker.   The insert according to any one of claims 1 to 3, wherein a polishing bar in a direction parallel to a central axis of the shank portion is provided on a surface of the notch groove.   A cutting tool in which the insert according to any one of claims 1 to 4 is inserted and fixed in a long insertion hole provided on the tip side of the holder.