JPH0512005U - Throwaway cutting tool - Google Patents

Abstract

(57) [Summary] [Structure] A mounting surface 12A is formed at the tip of the shank portion 12 made of cemented carbide along the longitudinal direction of the tool body 11.
A flat plate-shaped chip mounting member 13 made of steel or a sintered alloy is fixed to this. The chip mounting member 13 is provided with at least a part of a chip mounting seat bottom surface 14A and chip mounting seat wall surfaces 14B and 14C constituting the chip mounting seat 14. [Effect] With respect to the cutting force F that acts on the cutting edge 15C of the tip 15 during cutting, high strength is secured, and even when an excessive cutting load acts, the occurrence of division of the tip mounting member 13 and the like can be prevented. it can. The rigidity at the tip of the tool is increased, the vibration damping property is improved, and the occurrence of chattering and the like can be effectively suppressed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tool, a boring bar, an end mill, etc. in which a throw-away tip (hereinafter referred to as a tip) is attached to a tip mounting seat formed at the tip of a tool body, and in particular, a shank portion is made of a cemented carbide. The present invention relates to a throw-away type cutting tool in which the tip mounting seat portion is made of steel or a machinable sintered alloy.

[0002]

[Prior Art]

 Cutting tools such as cutting tools, boring bars, and end mills are known to use cemented carbide for the shank in order to improve vibration resistance and reduce chattering. However, in a throw-away type cutting tool that uses a tip for the cutting edge, it is difficult to form the tip mounting seat if the entire tool body is made of cemented carbide. The tip part is formed of steel or a sintered alloy that can be machined, and this is attached to the shank part made of cemented carbide.

FIG. 9 and FIG. 10 show an example of such a throw-away type cutting tool. In these figures, the tool body 1 is composed of a cylindrical shank portion 2 made of cemented carbide and a tip mounting member 3 made of steel or a sintered alloy, and the tip end portion of the tip mounting member 3 is formed. The tip 5 is mounted on the tip mounting seat 4 formed on the above and is fixed by the clamp mechanism 6. The tip mounting member 3 is formed in a cylindrical shape having the same diameter as the shank portion 2 on the base end 3A side, and is cut into a semicircular cross section by cutting off the flat surface 3C including the axis O of the cylinder on the tip end 3B side. It is molded and fixed to the tip of the tool body 1 by brazing the base end surface of the tip mounting member 3 to the tip surface of the shank portion 2. The chip mounting seat 4 and the clamp mechanism 6 are provided on the plane 3C of the chip mounting member 3.

The tip 5 is a positive type tip having a substantially equilateral triangle shape in a plan view from the one end face 5A side which is a rake face in this example, and the one end face 5A and three peripheral surfaces serving as flank faces. A cutting edge 5C is formed at each of the intersecting ridges formed by 5B. On the other hand, the chip mounting seat 4 on which the chip 5 is mounted is formed by lowering the chip mounting seat bottom 4A one step lower than the plane 3C, and standing upright from the chip mounting seat bottom 4A. It is composed of two chip mounting seat wall surfaces 4B and 4C connected to each other, and the narrow angle formed by these chip mounting seat wall surfaces 4B and 4C is set to 60 °. Further, the tip mounting seat 4 is configured such that the cutting edge 5C of the tip 5 with the tip 5 mounted thereon is perpendicular to the axis O and slightly protrudes in the direction of the axis O from the tip of the tip mounting member 3. Has been formed.

In addition, the clamp mechanism 6 presses the claw 6C provided at the tip of the clamp piece 6B against the one end surface 5A of the chip 5 mounted on the chip mounting seat 4 by screwing in the clamp screw 6A. The other end surface 5D serving as the seating surface of the chip 5 is brought into close contact with and fixed to the above-mentioned chip mounting seat bottom surface 4A by pressure. Then, two of the three peripheral surfaces 5B of the chip 5 are brought into contact with the chip mounting seat wall surfaces 4B, 4C, and then the chip 5 is fixed by the clamp mechanism 6 so that the chip 5 is fixed. The position is determined. Reference numeral 4D in the drawing is a relief portion for avoiding interference between the corner portion formed by the peripheral surfaces 5B of the chip 5 and the chip mounting seat 4.

[0006]

[Problems to be solved by the device]

 By the way, in the throw-away type cutting tool having such a structure, as described above, the tool body 1 is brazed to the tip end surface of the cylindrical shank portion 2 and the base end surface of the tip mounting member 3 having the same diameter as the tool body 1. It is configured by being fixed by such as. Therefore, both brazing surfaces are formed in a direction perpendicular to the tool axis O.

On the other hand, in the cutting with such a throw-away type tool, the cutting force F acting on the tool at the time of cutting acts in the direction perpendicular to the axis O as shown by the white arrow in FIG. Become. Therefore, in the case of the above-mentioned conventional example, the direction in which the cutting force F acts is the same as the direction formed by the joint surface between the shank portion 2 and the tip mounting member 3, and the cutting force F is It acts in the direction of shearing. Therefore, when an excessive cutting force acts on the chip mounting member 3 via the chip 5, there is a risk that the chip mounting member 3 may be separated from the shank portion 2 from this joint surface. Even if the cutting tool is not divided, the portion occupied by the tip mounting member 3 made of steel or the like is inevitably relatively large in the cutting tool having the above-mentioned configuration, which reduces the rigidity of the tool at the tip of the tool. Is inevitable. This may impair the anti-vibration property and cause vibration and chatter during cutting.

[0008]

[Means for Solving the Problems]

 The present invention has been made to solve such a problem, and a tool main body is configured by fixing a tip mounting member made of steel or a sintered alloy to the tip of a rod-shaped shank portion made of cemented carbide. In a throw-away cutting tool in which a tip is attached to the tip mounting seat formed at the tip of this tool body, this tip mounting member is formed into a flat plate shape in which at least a part of the tip mounting seat is formed. The feature is that a mounting surface is formed at the tip of the shank along the longitudinal direction of the shank, and the tip mounting member is fixed to the shank so that one surface of the chip mounting member is in close contact with this mounting surface. It is a thing.

Here, only the tip mounting seat wall surface for restraining the peripheral surface of the throw-away tip is formed on the tip mounting member by standing in the thickness direction of the tip mounting member from the mounting surface of the shank portion, The mounting surface of the portion connected to this wall surface may be a chip mounting seat bottom surface with which the seating surface of the chip abuts. Alternatively, the chip mounting seat bottom surface parallel to the above-mentioned one surface of the chip mounting member where the seat surface of the chip comes into contact with the chip mounting member, and the chip mounting seat bottom surface are vertically raised from the chip mounting seat bottom surface. And a wall surface of the chip mounting seat that restrains the peripheral surface of the chip. In this case, it is preferable that the thickness of the chip mounting member in the thickness direction between the bottom surface of the chip mounting member and one surface of the chip mounting member is 0.1 mm to 1.0 mm.

[0010]

[Action]

 In the present invention, the tip mounting member is formed in the shape of a flat plate, and the mounting surface on which the tip mounting member is mounted is formed along the longitudinal direction of the shank portion, so that it is perpendicular to the axis of the tool body. The cutting force acting in the direction also acts in the direction perpendicular to the mounting surface. That is, a load is applied to a direction perpendicular to the load applied during cutting, and the cutting force can be prevented from acting in the direction of shearing the tip mounting member and the shank portion. Further, by forming the mounting surface on which the chip mounting member is fixed along the longitudinal direction of the shank part, the shank part made of cemented carbide extends to the vicinity of the cutting edge of the chip protruding from the tool tip. Therefore, it is possible to improve the rigidity of the cutting tool at the tip of the tool.

[0011]

【Example】

 1 to 3 show a tip portion of a throw-away type cutting tool according to an embodiment of the present invention. As shown in these figures, also in this embodiment, the tool main body 11 comprises the shank portion 12 and the tip mounting member 13, and the tip 15 is mounted on the tip mounting seat 14 formed at the tip of the tool main body 11. It is configured to be fixed by the clamp mechanism 16.

The shank portion 12 is a substantially columnar member made of cemented carbide as in the conventional example, but its tip portion does not include the tool axis O and is a flat surface extending in a direction parallel to the tool axis O. A portion including the tool axis O is cut out by this, whereby a substantially square attachment surface 12A of the tip attachment member 13 parallel to the tool axis O is formed at the tip of the shank portion 12. The base end side of the mounting surface 12A is a surface that once rises in a direction perpendicular to the mounting surface 12A and then is inclined and continues to the outer peripheral surface of the shank portion 12. On the other hand, FIG. 4 shows the chip mounting member 13 mounted on this mounting surface 12A. As shown in this figure, the tip mounting member 13 has a square flat plate shape corresponding to the planar shape of the mounting surface 12A, and is made of steel or machinable sintered alloy or the like, which constitutes the shank portion 12. It is molded from a material with higher toughness than hard alloys. The chip mounting member 13 is formed so as to penetrate the chip mounting member 13 in the thickness direction inward according to the shape of the chip 15 mounted on the chip mounting member 13 in plan view from the thickness direction. A part of the chip mounting seat 14 is formed by being cut out.

Here, in this embodiment, the tip 15 is a positive type tip having a substantially equilateral triangle shape in a plan view from the side of the one end face 15A which is a rake face as in the above-mentioned conventional example, and the one end face 15A is used. Cutting edges 15C are formed at the intersecting ridges formed by the three peripheral surfaces 15B serving as flanks. Correspondingly, the notch portion 13A formed in the chip mounting member 13 also opens in a triangular shape in a plan view from the thickness direction on both surfaces of the chip mounting member 13 and two peripheral surfaces orthogonal to each other. The two surfaces 13B and 13C which are notched as described above and which are formed by the notched portion 13A and which extend in the thickness direction have a narrow angle set to 60 ° as the wall surface of the chip mounting seat 14 described later. ing. The tip mounting member 13 is fixed to the tip of the shank portion 12 by brazing so that one surface 13D of the tip mounting member 13 is brought into close contact with the mounting surface 12A and the notch portion 13A is opened to the tool tip side. Has been done. The thickness of the tip mounting member 13 is set such that the other surface 13E substantially includes the tool axis O when the tip mounting member 13 is fixed to the mounting surface 12A. Further, the surfaces 13B and 13C of the chip mounting member 13 which are the wall surfaces of the chip mounting seat 14 have the edges on the other surface 13E side in conformity with the clearances attached to the peripheral surface 15B of the chip 15. It is formed in an inclined surface shape that widens toward the surface 13E side.

In the present embodiment, the chip mounting seat 14 is formed by the two surfaces 13B and 13C of the chip mounting member 13 along the thickness direction and the mounting surface 12A of the portion surrounded by these surfaces 13B and 13C. Is configured. That is, in this chip mounting seat 14, the mounting surface 12A portion surrounded by the surfaces 13B and 13C of the chip mounting member 13 becomes the chip mounting seat bottom surface 14A which is further lowered from the other surface 13E of the chip mounting member 13, Further, the surfaces 13B and 13C of the chip mounting member 13 become chip mounting seat wall surfaces 14B and 14C which stand upright from the chip mounting seat bottom surface 14A and are continuous with the other surface 13E. Further, the tip 15 is mounted on the tip mounting seat 14, the other end surface 15D serving as a seating surface is the bottom surface 14A of the tip mounting seat, and two of the three peripheral surfaces 15B are the wall surfaces 14B, 14C of the tip mounting seat. The cutting blades 15C are respectively brought into contact with each other, and are mounted so as to be perpendicular to the axis O and slightly project from the front end surfaces of the shank portion 12 and the tip mounting member 13 in the direction of the axis O, It is fixed by the clamp mechanism 16. As in the conventional example, the clamp mechanism 16 has a structure in which the clamp screw 16A is screwed in to press and fix the chip 15 against the chip mounting seat 14 by the claw 16C provided at the tip of the clamp piece 16B. There is.

According to the throw-away type cutting tool having such a configuration, the cutting force F acting on the tip 15 at the time of cutting is along the longitudinal direction of the tip mounting seat bottom surface 14A, that is, the shank portion 12 made of cemented carbide. It will be received by the mounting surface 12A formed as described above. Therefore, it is possible to prevent the cutting force F from acting on the joint surface between the shank portion 12 and the tip mounting member 13 in the direction of shearing the joint surface. Therefore, it is possible to secure high strength against the cutting load, and it is possible to prevent the cutting of the tool even when an excessive load is generated. Further, since the shank portion 12 made of cemented carbide extends to the vicinity of the cutting edge 15C as the tip mounting seat bottom surface 12A and holds the tip 15, high rigidity can be secured even at the tool tip portion, Vibration resistance is improved, and it is possible to more effectively suppress chatter and vibration during cutting work.

Further, according to the present embodiment, the chip mounting seat 14 is formed from the chip mounting seat bottom surface 14A formed on the mounting surface 12A of the shank portion 12 and the chip mounting seat wall surfaces 14B and 14C formed on the chip mounting member 13. Since the mounting surface 12A is a flat surface and the chip mounting seat wall surfaces 14B and 14C are formed by cutting out a flat plate-shaped chip mounting member 13 so as to penetrate in the thickness direction, It is possible to obtain the advantage that the mounting seat 14 can be molded significantly easily. That is, when the chip mounting seat 14 is formed, only the linear processing needs to be performed, and the depth of the chip mounting seat 14 can be easily determined by the thickness of the chip mounting member 13. It is possible to simplify the molding process.

Next, FIG. 5 shows another example of the chip mounting member according to the present invention. The same parts as those of the chip mounting member 13 shown in FIG. To do. In the tip mounting member 17 shown in this figure, a thin plate-like member connected to the above-mentioned one surface 13D that is in close contact with the mounting surface 12A of the shank portion 12 is surrounded by the notch surfaces 13B and 13C that become the chip mounting seat wall surfaces 14B and 14C. The bottom plate portion 17A is integrally formed on the chip mounting member 17, and one surface of the bottom plate portion 17A serves as the chip mounting seat bottom surface 14A, and the entire portion of the chip mounting seat 14 is molded on the chip mounting member 17. Is a feature.

The tip mounting member 17 having such a configuration is also fixed to the shank portion 12 of the tool body 11 by brazing or the like as in the above-described embodiment for use, and the same effect as that of the above-described embodiment can be obtained. You can In addition, since the entire surface of the one surface 13D of the chip mounting member 17 serves as the brazing surface, the brazing area is larger than that of the chip mounting member 13 shown in FIG. It becomes possible to fix to the shank portion 12. Further, since there is no brazing part between the tip mounting seat bottom surface 14A and the chip mounting seat wall surfaces 14B and 14C, it is possible to obtain the advantage that the chip mounting seat 14 can be molded more accurately. In this case, the distance in the chip thickness direction between the chip mounting seat bottom surface 12A of the chip mounting member 17 and the one surface 13D, that is, the wall thickness T of the bottom plate portion 17A is 0.1 mm to 1.0 mm. Is desirable. If this wall thickness T is less than 0.1 mm, the bottom plate portion 17A becomes too thin, making it difficult to form. On the contrary, if this wall thickness T exceeds 1.0 mm and becomes large, the wall thickness at the tool tip of the shank portion 12 becomes small. It is unavoidable that the rigidity may be insufficient.

Further, in the above embodiment, the case where the tip mounting members 13 and 17 are fixed to the mounting surface 12A of the shank portion 12 by brazing has been described, but the present invention is not limited to this. For example, as shown in FIGS. 6 to 8, screw holes 18 are screwed in the chip mounting members 13 and 17 in the thickness direction thereof, and through holes 19 and counterbore parts 20 are formed in the shank portion 12, Alternatively, the set screw 21 may be inserted into and screwed to the chip mounting members 13 and 17 so that the chip mounting members 13 and 17 are pulled toward the mounting surface 12A to be fixed. In this case, since the chip mounting member 13 shown in FIG. 4 also has no brazing portion, the chip mounting seat 14 can be formed relatively accurately.

[0020]

[Effect of the device]

 As described above, according to the present invention, since the mounting surface on which the tip mounting member is fixed is formed in the direction perpendicular to the direction in which the cutting force is applied, this cutting force is applied to the tip mounting member and the shank portion. It does not work to shear the joint surface with the cutting edge, high strength against the cutting force is secured, and even when an excessive cutting load is applied, it is possible to prevent the chip attachment part material from breaking. .. Furthermore, since the shank part made of cemented carbide extends to the vicinity of the cutting edge of the tool tip, the rigidity at the tool tip part increases, the vibration damping property is improved, and the occurrence of chattering etc. is effectively suppressed. It becomes possible.

[Brief description of drawings]

FIG. 1 is a plan view of a tool tip portion according to an embodiment of the present invention.

FIG. 2 is a side view of the tip of the tool shown in FIG.

3 is a front view of the tip end portion of the tool of FIG. 1 as seen from the tip end side in the direction of the axis O. FIG.

FIG. 4 is a chip mounting member 13 according to the embodiment shown in FIG.
FIG. 4A is a front view and FIG.

5 (a) is a front view and FIG. 5 (b) is a plan view showing another example of the tip mounting member according to the present invention.

FIG. 6 is a plan view of a tool tip portion according to another embodiment of the present invention.

FIG. 7 is a side view of the tool tip portion shown in FIG.

FIG. 8 is a front view of the tip end portion of the tool shown in FIG. 6 as seen from the tip end side in the direction of the axis O.

FIG. 9 is a plan view showing a tip portion of a conventional throw-away type cutting tool.

10 is a side view of the conventional example shown in FIG.

[Explanation of symbols]

 1,11 Tool body 2,12 Shank part 12A Mounting surface 3,13,17 Chip mounting member 4,14 Chip mounting seat 4A, 14A Chip mounting seat bottom surface 4B, 4C, 14B, 14C Chip mounting seat wall surface 5,15 Chip 6 , 16 Clamp mechanism

Claims (4)

[Scope of utility model registration request] 1. A tool main body is constructed by fixing a tip mounting member made of steel or a sintered alloy to the tip of a rod-shaped shank portion made of cemented carbide, and throws to a tip mounting seat formed at the tip of the tool body. In a throw-away type cutting tool in which an away tip is mounted, the tip attachment member is formed into a flat plate shape in which at least a part of the tip attachment seat is formed, and the shank tip has a longitudinal direction of the shank portion. A throw-away cutting tool, characterized in that a mounting surface is formed along with, and the tip mounting member is fixed to the shank portion by making one surface of the mounting member adhere to the mounting surface. 2. A tip mounting seat wall surface is formed on the tip mounting member so as to stand upright from the mounting surface of the shank portion in the thickness direction of the tip mounting member to restrain the peripheral surface of the throw-away tip, and The throw-away type cutting tool according to claim 1, wherein the attachment surface of the portion continuous with the wall surface is a tip attachment seat bottom surface with which the seating surface of the throw-away tip abuts. 3. The chip mounting member includes a chip mounting seat bottom surface parallel to the one surface of the chip mounting member with which the seating surface of the throw-away chip abuts, and the chip mounting seat bottom surface. 2. A throw-away type cutting tool according to claim 1, further comprising a tip mounting seat wall surface which stands upright in the thickness direction of the step and restrains the peripheral surface of the throw-away tip. 4. The wall thickness in the thickness direction between the bottom surface of the chip mounting seat of the chip mounting member and the one surface is 0.1 m.
The indexable cutting tool according to claim 3, wherein the indexable cutting tool is m to 1.0 mm.