WO2006068031A1

WO2006068031A1 - Throw-away tip, method of manufacturing the throw-away tip, and cutting tool using the throw-away tip

Info

Publication number: WO2006068031A1
Application number: PCT/JP2005/023075
Authority: WO
Inventors: Kiyotada Takayanagi
Original assignee: Kyocera Corporation
Priority date: 2004-12-24
Filing date: 2005-12-15
Publication date: 2006-06-29
Also published as: JPWO2006068031A1

Abstract

A throw-away tip easily manufacturable and enabling a reduction in running-in working at the initial period of a working, a method of manufacturing the throw-away tip, and a cutting tool using the throw-away tip. In the throw-away tip, a small diameter bar-like part is integrally projected from a holder fixing base part, and a cutting edge (8) projected sideways from the peripheral surface of the small diameter bar-like part to work a cut material is formed at the tip of the small diameter bar-like part. The cutting edge (8) comprises a circular arc-shaped side cutting edge (8a) and a linear front cutting edge (8c), and the side cutting edge (8a) and the front cutting edge (8c) are formed to cross each other through a corner part (8b).

Description

Specification

Throw-away insert, method for manufacturing the same, and cutting tool using the throw-away chip

Technical field

[0001] The present invention relates to a throw-away tip and a cutting tool used for a throw-away type cutting tool, and particularly intended for inner diameter processing, and also for small-sized products such as OA equipment parts, electronic parts, and small-diameter bearings. A cutting tool suitable for the minimum inner diameter force

Background art

[0002] Conventionally, for ultra-small inner diameter covers such as O-A equipment parts and electronic parts, there is a rod-shaped base part that is a mounting part to a sleeve type holder and a small-diameter bar-shaped part that has a cutting edge at the tip. -A throwaway tip that is formed physically, or a throwaway tip that is formed of a flat base that serves as an attachment to the holder and a small-diameter bar with a cutting edge at the tip. (For example, see JP-A-11-320217).

In addition, the applicant of the present application disclosed in Japanese Patent Application Laid-Open No. 2004-188585, by forming a first substantially arc-shaped cutting blade and a second arc-shaped cutting blade having a larger radius of curvature as the tip cutting blade. It was proposed that the roughness of the finished surface of the work material, which is caused by a shift in the attachment position of the thrower tip at the initial stage of machining with the holder attached to the holder, can be prevented.

However, as disclosed in Japanese Patent Application Laid-Open No. 2004-188585, forming the first substantially arcuate cutting edge and the second arcuate cutting edge having a larger curvature radius than that of the work material in the initial stage of the cage Although there is an effect of improving the finished surface roughness, it is technically advanced to process into a powerful cutting edge shape, so if you use equipment with poor processing accuracy, it may not be finished in the desired shape, On the contrary, the surface roughness of the work material in the initial stage of machining sometimes deteriorated. Even when finished in the desired cutting edge shape, it is necessary to perform a break-in process until the finished surface roughness is stabilized at the initial stage of machining in order to correct a small displacement of the tip mounting position. It is necessary to reduce the number of work materials and the time required for cutting. It has been put.

Disclosure of the invention

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a throw-away tip that can be easily manufactured and that can reduce the force and the running-in force at the initial stage of processing.

In the present invention, conventionally, the cutting edge is processed into an arc shape from the front cutting edge to the side cutting edge so that the side cutting edge is curved from the rear end side to the corner. To finish the curving process at the corner, that is, the cutting edge on the tip side from the corner is not arcuate, and the cutting edge is arcuate with the side cutting edge. By forming a straight shape with the front cutting edge on the tip side through the tip, the tip cutting edge can be easily machined and a stable shape can be created, and the break-in force applied at the initial stage of machining In other words, the throw-away tip of the present invention has a rod-shaped portion integrally projecting from a holder fixing base portion, and a work material is placed on the tip of the rod-shaped portion. A throw-away tip formed with a cutting blade that protrudes laterally from the peripheral surface of the rod-like portion should be used. Te, wherein the cutting edge is characterized in that consists of a side cutting edge forming a front cutting edge and curve rectilinear, the front and cutting edge and the side cutting edge and intersects the corners.

Here, a configuration in which a rear cutting edge that forms a straight line following the side cutting edge is more desirable. Also, an angle formed by a tangent at the corner of the side cutting edge and the front cutting edge is an acute angle. It is preferable in that a smooth finish surface can be easily obtained by reducing cutting resistance during processing and improving sharpness.

Here, the side cutting edge is composed of an arc having a radius of curvature R of 0.1 mm or more and 0.5 mm or less. Force The arc part functions as a blade and is relatively quickly ground by machining. It is possible to adjust to the finished surface shape of the work material at an early stage in the caulking, and to reduce the break-in force.

Also, the rake angle of the rake face following the side cutting edge is 5 ° or more and 20 ° or less. This is desirable because it can quickly match the finished surface shape of the work material and maintain the cutting edge strength necessary for machining.

Also, the clearance angle of the flank following the side cutting edge is 5 ° or more and 20 ° or less, so that the side cutting edge can be polished relatively quickly by caloe, and it is covered early in the initial break-in processing. This is desirable in that it can be matched to the shape of the finished surface of the work material and can maintain the cutting edge strength required for processing.

In the method of manufacturing the throw-away tip according to the present invention, the rod-shaped portion is integrally projected from the holder fixing base portion, and the periphery of the rod-shaped portion is formed so as to clean the work material at the tip of the rod-shaped portion. In the method of manufacturing a thrower tip in which a cutting edge is formed that protrudes laterally from a surface, the cutting edge includes a straight cutting edge, a curved side cutting edge, and the front cutting edge. The cutting blade is polished so as to form a curved line up to the side cutting edge force and the corner so that the cutting edge and the corner intersecting with the side cutting edge are formed, and the corner It is characterized in that it is obtained by finishing the curved polishing process at the part, and the cutting edge can be easily processed, and there is no processing variation and a stable shape can be obtained.

Further, the cutting tool according to the present invention, in which the above throwaway tip is mounted on the holder, requires less break-in processing, especially for inner diameter processing, and further for OA equipment parts, electronic parts, small diameter bearings, etc. It is suitable for ultra-small inner diameter processing for small products.

Brief Description of Drawings

Objects, features and advantages of the present invention will become more apparent from the following detailed description and drawings.

FIG. 1 is a schematic plan view of an essential part of a first embodiment of a cutting tool equipped with a thrower tip of the present invention.

FIG. 2 is a view of the throw-away tip in FIG.

FIG. 3 is a view in the direction of arrow B of the throw-away tip in FIG.

4 is an enlarged view of a main part of the cutting edge portion of the throw-away tip in FIG. 1, FIG. 4A is a schematic plan view, and FIG. 4B is a schematic perspective view.

FIG. 5 shows a second embodiment of the cutting tool equipped with the throwaway tip of the present invention. FIG.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

A typical embodiment of a thrower tip of the present invention and a cutting tool equipped with the thrower tip will be described with reference to the schematic views of FIGS.

FIG. 1 is a schematic plan view showing the main part of a cutting tool T in which the thrower tip 1 is mounted on the holder 7 in the first embodiment of the present invention, and FIG. Fig. 3 is a view in the direction of the arrow A of the chip, Fig. 3 is a view in the direction of the arrow B of the throwaway tip in Fig. 1, and Fig. 4 is an enlarged view of the main part of the cutting edge portion of the throwaway tip in Fig. 1. FIG. 4A is a schematic plan view, and FIG. 4B is a schematic perspective view. The cutting tool T according to the present invention is used for internal diameter adjustment, and is suitable for an extremely small internal diameter force target for small products such as OA equipment parts, electronic parts, and small diameter bearings.

The cutting tool T has a throwaway tip 1 mounted on a holder 7. The throwaway chip 1 is composed of a small-diameter rod-like portion 4 on which a cutting edge 8 is formed and a flat-plate holder fixing base (hereinafter referred to as a flat-plate base) 2 fixed to the holder 7. Configured as follows. The small-diameter rod-like portion 4 is substantially rod-shaped and is integrally formed with the flat plate-like base portion 2 along one side surface 3 so as to protrude in the direction in which the axis extends. The flat base portion 2 is formed with a screw hole 5 for fixing a chip screw that penetrates to the bottom surface at the center thereof, and is fixed to the holder 7 with a screw 6 for fixing the chip.

Further, as shown in FIG. 3, the throw-away tip 1 is formed with a cutting edge 8 projecting laterally from the peripheral surface of the small-diameter bar-shaped portion 4 at the tip of the small-diameter bar-shaped portion 4 so as to process the work material. The cutting tool T equipped with the throw-away tip 1 can be used for inner diameter processing. The tip of the cutting edge 8 is formed so as to protrude from the side surface 3 in a radial direction that is lateral. In addition, r shown in FIG. 3 is the machining diameter of the work material when machining the inner diameter, and is twice the distance from the axis to the tip of the cutting edge 8 in the radial direction.

In the throw-away tip 1, as shown in FIGS. 4A and 4B, the cutting edge 8 includes a straight front cutting edge 8c, a curved side cutting edge 8a, the front cutting edge 8c, and the front cutting edge 8c. It is comprised including the corner | angular part 8b where the side cutting edge 8a crosses. Make a straight line following the side cutting edge 8a. The rear cutting edge 11 is formed. The cutting edge 8 includes a side cutting edge 8a that forms an arc shape that protrudes outward from the side rear end side, and a front cutting edge 8c that forms a straight line on the front end side via a corner portion 8b. The shape of the cutting edge 8 shown in FIG. 4 is such that the cutting edge 8 is polished with a grinder so as to form an arc shape from the side rear end side to the corner portion 8b, and the arc shape is formed at the corner portion 8b. It can be formed by finishing the polishing process. Accordingly, the virtual arc shape of the side cutting edge 8a is formed up to the intersection with the straight rear cutting edge 11 on the rear end side and the point where it intersects with the front cutting edge 8c on the front end side. That is, the corner 8b is a portion where the front cutting edge 8c and the side cutting edge 8a intersect.

As a result, the cutting edge 8 can be easily machined and a stable shape can be formed, and the break-in force applied at the initial stage of machining can be reduced.

As shown by the broken line in FIG. 4A, the radius of curvature R of the side cutting edge 8a of the cutting edge 8 is set to 0.1 mm to 0.5 mm, preferably 0.1 mm to 0.4 mm. . As a result, the side cutting edge 8a, which is a circular arc part, functions as a cutting edge and is ground relatively quickly by machining, and immediately matches the finished surface shape of the work material quickly in the initial break-in process. This can reduce the amount of break-in.

Further, the rake angle α of the rake face 9 following the side cutting edge 8a is set to 5 ° or more and 20 ° or less, preferably 10 ° or more and 15 ° or less. The clearance angle of the flank 10 following the side cutting edge 8a is set to 5 ° to 20 °, preferably 10 ° to 18 °, particularly preferably 12 ° to 18 °. By setting the rake angle α and the relief angle β in this way, the cutting edge 8 is easily ground relatively quickly by machining, and can be adjusted to the finished surface shape of the work material early in the initial break-in process. At the same time, it is desirable in that the cutting edge strength required for machining can be maintained. In FIG. 3, the second flank 10a is formed so that the second flank angle β ′ (β <j3 ′) follows the flank angle β of the flank 10 following the side cutting edge 8a. The throwaway tip 1 is prevented from interfering with the work material.

Further, as shown in FIG. 4A, such that the acute angle of less than angle _Ί force S90 ° with the front cutting edge 8c and the tangent 12 at the corner 8b of the side cutting edge 8a, the cutting edge 8 is formed . This reduces the cutting resistance during heating and improves the sharpness, which is preferable in that a smoother finished surface can be easily obtained.

Example Data on the shape of the throw-away tip 1 of this embodiment and the conventional throw-away tip, and the work piece material necessary when running-in using each throw-away tip An example of the number of data is shown in Table 1. Table 1 shows data relating to 23 throwaway tips of Sample No .:! To 23. No .:! To 20 is the throwaway tip 1 of the present invention, and No. 21 to 23 are It is a throw-away chip of conventional technology.

The material of each thrown tip is equal to the average particle size of 0.4 xm for WC powder with an average particle size of 1.5 xm (0.6% by mass of DCr C powder, average particle size of 1 2 111 ○ Powder

3 2

Co powder of 0.3% by mass with an average particle size of 0.

After firing and cutting the cutting edge, the hard layer of (Ti, A1) N is coated by PVD method to form the throwing tip with the cutting edge shape of each sample number shown in Table 1. Produced.

The obtained throwaway insert was subjected to a break-in force under the following conditions, and the surface roughness required for the surface roughness of the work material to be 0.1 μm or less in terms of arithmetic average roughness (Ra). The number of machined workpieces was compared.

Work material: Stainless steel (SUS304)

Processing diameter: 3mm

Cutting speed: 70m / min

Feeding speed: 0.03mm / rev

Cutting depth: 0.04mm

Other: Uses water-soluble cutting fluid

[table 1] Tip cutting edge shape

Sample Rake angle Clearance angle Break-in Cutting edge machining area

No. Curvature radius

Tip corner side part) β ') Number of machining (pieces)

R (mm)

1 Straight from side to back corners with circular arc 0.1 10 10 60

2 From the rear side to the corner Straight line Arc 0.2 10 10 50

3 Straight from side to rear corners with arc 0.3 10 10 60

4 Side straight from corner to corner Straight arc 0.4 10 10 70

5 Side straight from corner to corner Straight line Arc 0.5 10 10 90

6 Straight from rear side to corner There is a circular arc 0.3 5 10 90

7 Straight from rear side to corner Corner Arc 0.3 10 10 60

8 Straight from rear side to corner Corner with arc 0.3 12 10 50

9 Straight from side to back corners with arc 0.3 15 10 70

10 Straight from rear side to corner A straight arc 0.3 20 10 90

1 1 Straight from rear side to corner Corner with arc 0.3 10 5 90

12 Straight from rear side to corner Corner Arc 0.3 10 10 60

13 Straight from side to rear corner Yes Arc 0.3 10 1 1 50

14 Straight from rear side to corner Corner Arc 0.3 10 1 5 60

15 Straight from side to back corners with circular arc 0.3 10 1 8 70

16 Straight from side to back corners with circular arc 0.3 10 20 90

1 7 Straight from side to back corners with circular arc 0.2 12 1 1 40

18 Straight line from rear side to corner Corner Arc 0.2 5 1 1 80

19 Straight from rear side to corner With arc 0.3 10 9 90

20 Straight from side to rear corners Yes Arc 0.5 20 12 100

21 No machining Straight line None Straight line 15 1 1

stop

22 From the rear side to the tip Arc No arc 0.2 18 1 1 220

23 From the rear side to the tip Arc None Arc (Type 2) 0.1 18 12 180 As is clear from the results in Table 1, according to the present invention, the cutting edge has an arc shape from the side rear end, and the corner Sample Nos. That have a linear shape on the tip side via the No .:! ~ 20 all have a surface roughness (Ra) of 0.1 μm or less with a running-in force of 100 or less Machining efficiency was improved.

In contrast, Sample No. 21 where the cutting edge is not processed and the side cutting edge is linear, and Sample No. 22 and 23 where the entire cutting edge is arcuate are both compared with the insert of the present invention. As a result, the number required for break-in processing is large and the processing efficiency is low.

As described above, the cutting tool T according to the present invention in which the above-described throw-away tip 1 is mounted on the holder 7 requires less break-in processing. This is similar to the shape of the cutting blade 8 after the break-in caloche is completed (hereinafter sometimes referred to as the “final shape of the cutting blade”), and the cutting blade 8 is acclimated. Since the shape is easy to wear due to processing, the final shape of the cutting edge can be obtained with less acclimation than conventional techniques. The cutting tool T is particularly effective for the method in which only the small-diameter bar-like portion 4 is inserted into the hole of the work material to perform the inner diameter force check. Furthermore, the cutting tool T is used for OA equipment parts, electronic parts, small-diameter bearings, etc. For small products Especially suitable for high precision machining on the order of submicron, for example, where a minimum inner diameter force of 4 mm or less is required and the surface roughness of the work material must be smoothed. .

FIG. 5 is a schematic plan view of a main part showing a state in which the throw-away tip 21 is fixed to the holder 25 in the second embodiment of the present invention. The cutting tool T ′ of the present embodiment is similar to the cutting tool T of FIGS. 1 to 4 described above, and only the different configuration will be described, and the description of the same configuration may be omitted. The present embodiment is characterized in that the flat base 2 constituting the above-described embodiment is a rod-shaped base 20.

The cutting tool T ′ is formed by mounting a throw-away tip 21 having a rod-like base 20 on a holder 25. The throw-away tip 21 has a substantially rod shape and has a cutting edge 23 protruding laterally from the circumferential surface of the small-diameter rod-shaped portion 22 at the front end in the longitudinal direction, and the rear end surface 24 has a length from the front end in the longitudinal direction. Are partially different, in other words, formed so as to intersect the axial direction. The holder 25 is formed with an insertion hole that extends in the radial direction of the throw-away tip 21 and allows the fixing pin 26 to pass therethrough. A cylindrical fixing pin 26 is provided in the insertion hole.

When the rod-like base portion 20 of the throw-away tip 21 is inserted into the holder 25, the rear end surface 24 and the side surface portion of the fixing pin 26 are configured to abut on a linear abutting region extending in the axial direction of the fixing pin 26. . In such a contact state, the throwaway tip 21 is pressed against the holder 25 with a bolt to maintain the contact state between the rear end surface 24 and the fixing pin 26, and the throwaway tip 21 is fixed. The As a result, the mounting position accuracy of the cutting blade 23 can be increased, and the restraining force around the axis of the throwaway tip 21 can be improved. In other words, the throwaway tip 21 can move the axis during machining. Rotation to the center can be prevented.

The cutting blade 23 formed at the tip of the small-diameter rod-shaped portion 22 that integrally protrudes from the rod-shaped base portion 20 is formed in the same configuration as the cutting blade 8 of the throw-away tip 1 having the flat plate-shaped base portion 2 described above. . Therefore, the cutting blade 23 has the same operations and effects as the cutting blade 8 of the above-described embodiment. For example, the cutting blade 23 can be easily machined and a stable shape can be formed. By wearing out at the initial stage of the running-in force, the finished surface shape of the work material can be made quickly, and the running-in force performed at the initial stage of the work can be reduced. The embodiment of the present invention has been described above, but it goes without saying that the present invention is not limited to the above-described embodiment and can be arbitrarily set without departing from the object of the invention.

In the above-described embodiment, the side cutting edge 8a is formed in an arc shape, but is not limited thereto. For example, the side cutting edge 8a may be formed so as to be smoothly curved outward and convex from the tip of the front cutting edge 8c to the intersection with the rear cutting edge 11.

In the above-described embodiment, the corner portion 8b has a so-called sharp edge, but this is not a limitation. For example, the corner 8b can obtain a desired effect even if it is an R chamfer of 0.01 mm or less.

The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Accordingly, the above-described embodiment is merely an example in all respects, and the scope of the present invention is shown in the claims, and is not limited to the text of the specification. Further, all modifications and changes belonging to the scope of claims are within the scope of the present invention.

Industrial applicability

Normally, the process of forming the nose R at the tip of the cutting edge is performed along the edge of the cutting edge to the side of the tip force side, and it is processed so as not to leave a part that is extremely easily chipped such as a corner. It is.

However, according to the throw-away tip of the present invention, the side cutting blade is polished so as to form an arc shape from the rear end side to the corner portion, and the arc-shaped polishing processing is finished at the corner portion. That is, the cutting edge on the tip side from the corner is not arcuate, and the cutting edge is composed of a straight front cutting edge and a curved side cutting edge, and the front cutting edge and the side cutting edge. By making the shape intersect with the cutting edge, the cutting edge can be easily machined and a stable shape can be made, and the corner is worn by being worn out at the initial stage of the break-in force. Finishing of cutting material The surface shape can be made quickly, and the break-in processing performed in the initial stage of the caulking can be reduced.

Claims

The scope of the claims

[1] A rod-shaped portion is integrally protruded from the holder fixing base, and a cutting edge is formed at the tip of the rod-shaped portion so as to project laterally from the peripheral surface of the rod-shaped portion in order to process the work material. In the formed throw-away tip,

The cutting blade is

A front cutting edge that forms a straight line,

A side cutting edge that forms a curve,

A throw-away tip including a corner portion where the front cutting edge and the side cutting edge intersect.

[2] The throw-away tip according to claim 1, wherein a rear cutting edge that forms a straight line is formed following the side cutting edge.

[3] The throw-away tip according to claim 1 or 2, wherein an angle formed between a tangent at the corner of the side cutting edge and the front cutting edge is an acute angle.

[4] The throwaway tip according to any one of claims 1 to 3, wherein the side cutting edge is formed of an arc having a radius of curvature R of 0.1 mm or more and 0.5 mm or less.

[5] The throwaway tip according to any one of claims 1 to 4, wherein the rake face following the side cutting edge has a rake angle of 5 ° or more and 20 ° or less.

6. The throwaway tip according to any one of claims 1 to 5, wherein the flank following the side cutting blade has a flank angle of 5 ° or more and 20 ° or less.

[7] A rod-shaped portion is integrally projected from the holder fixing base, and a cutting edge is formed at the tip of the rod-shaped portion so as to project laterally from the peripheral surface of the rod-shaped portion in order to process the work material. The manufacturing method of the throw-away tip that was formed,

The cutting blade is configured such that the cutting blade includes a front cutting blade that forms a straight line, a side cutting blade that forms a curve, and a corner portion where the front cutting blade and the side cutting blade intersect. The throwaway tip is obtained by polishing so as to form a curved shape from the side cutting edge to the corner, and finishing the curving polishing at the corner. Method.

[8] A cutting tool comprising the holder and the thrower tip according to any one of claims 1 to 6.