JP2006192552A - Throw-away tip, its manufacturing method, and cutting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throw-away tip capable of suppressing chipping even if the tip processing amount is small and equipped with excellent anti-abrasiveness and anti-chipping performance, provide a cutting method using the tip, and also a method of manufacturing throw-away tips. <P>SOLUTION: The throw-away tip 1 has a machined surface where the arithmetic mean surface roughness Ra of the machined portion is 0.15 μm, and the condition that S/d<SP>2</SP>is between 2.8×10<SP>-6</SP>and 2.8×10<SP>-4</SP>should be met, where S in mm<SP>2</SP>is the area on the section of the part near the cutting edge 4 generated when it is cut by a plane perpendicular to the face 2, perpendicular to the tangent to the cutting edge 4, and passing the center O of the tip 1 in its part formed by excluding the actual section from the virtual section generated when the extension line L2 from the face 2 intersects the extension line L1 from the flank 3 while d in mm is the diameter of the inscribing circle of the tip 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a throw-away tip that cuts steel, an alloy, and the like, a manufacturing method thereof, and a cutting method.

  In recent years, in the field of metal cutting, the processing conditions have become stricter year by year, and as a cutting tool used therefor, a throw-away tip made of a hard sintered body such as cemented carbide, cermet, ceramic, etc. has become widespread. Generally, in such a throw-away tip, a cutting edge treatment is performed for the purpose of preventing the cutting edge from chipping or chipping in the early stage of cutting. With regard to this cutting edge treatment, the chipping resistance of the cutting edge is improved when the processing amount is increased. On the other hand, the cutting resistance increases, chattering occurs, the processing surface becomes rough, and the wear resistance decreases. Are known. Therefore, it is desirable to keep the cutting edge processing amount as small as possible. However, particularly in the case of hard and brittle materials such as conventional ceramics, it has been necessary to increase the processing amount of the blade edge in order to prevent chipping and chipping, and the surface roughness of the processed surface could not be increased.

As a method for solving this problem, for example, Patent Document 1 discloses that by reducing the cutting edge processing amount of the cutting edge portion of the nose portion and increasing the cutting edge processing amount of the cutting blade portion away from the nose portion where the chips collide. Methods have been proposed for preventing the progress of wear and preventing breakage. Japanese Patent Laid-Open No. 2004-228561 describes contents for relaxing stress concentration during grinding by changing the grinding (blade edge processing) direction.
JP-A-1-188202 JP 2000-280105 A

  However, measures to devise the blade edge processing method by the above-described method have an effect of improving chipping resistance, but have not yet reduced the amount of blade edge processing of the portion used for cutting in the cutting edge. For this reason, since the contact area between the work material and the cutting edge is increased, the roughness of the machined surface is increased, the wear progresses faster, and the tool life is limited.

  The present invention has been made to solve the above-mentioned problems, and its object is to suppress the occurrence of chipping even when the cutting edge processing amount is small, and a throw-away tip excellent in wear resistance and chipping resistance, and a method for producing the same And a cutting method.

  As a result of intensive studies to solve the above problems, the inventors of the present invention have covered the outer periphery of a long core material with a skin material having a composition different from that of the core material. Slow with excellent chipping resistance and wear resistance by adjusting the cutting edge processing amount (removal amount) of the cutting edge part and the surface roughness of the cutting edge processing surface. The present inventors have found a new fact that an away chip can be provided and completed the present invention.

That is, the throw-away tip of the present invention is a throw-away tip comprising a base material having a rake face on an upper surface and a flank face on a side surface, and a cutting edge provided on a cross ridge line of the rake face and the flank face. The material is composed of a composite structure in which fibrous materials obtained by covering the outer periphery of a long core material with a skin material having a composition different from that of the core material, and the surface near the cutting edge is substantially perpendicular to the rake face In the cross-section when cut at, the area of the virtual cross section excluding the actual cross section from the virtual cross section formed by the intersection of the extension line from the rake face and the extension line from the flank face is S, and the inscribed circle of the throwaway tip When the diameter is d, the cutting edge processing is performed so that (S / d ² ) is 2.8 × 10 ⁻⁶ to 2.8 × 10 ^−4, and the arithmetic average roughness of the cutting edge processing portion Ra is 0.15 μm or less. .

  The core material in the present invention is a ceramic composed of one or more selected from aluminum oxide, silicon nitride, silicon carbide, carbides of the periodic table 4a, 5a, and 6a group elements, nitrides, and carbonitrides. The skin material is made of ceramics composed of one or more selected from aluminum oxide, silicon nitride, silicon carbide, carbides of group 4a, 5a, 6a group elements, nitrides, carbonitrides. Preferably it is. Thereby, the hardness of a composite structure can be raised and the further improvement of the abrasion resistance of a cutting tool can be aimed at.

  Further, since the blade edge processing is chamfer honing, the cutting edge can be sharpened to reduce cutting resistance, and tool damage such as sudden chipping and chipping can be suppressed.

Further, the length L _R of the extension line from the rake face in the chamfer _honing, the length of the extension line from the flank when the L _F, they at L _R ≧ (√3) L _F Preferably there is. Thereby, chattering and chipping of the cutting edge can be prevented by further improving the sharpness of the cutting edge and reducing the cutting resistance.

  Further, the cutting method of the present invention is characterized in that the super heat-resistant alloy is cut using the above throwaway tip. As described above, the throw-away tip of the present invention exhibits a more remarkable effect in wear resistance and chipping resistance when used in cutting super heat-resistant alloys such as nickel-base alloys and titanium alloys.

The manufacturing method of the present invention is a method for manufacturing a throw-away tip comprising a base material having a rake face on the upper surface, a flank face on the side surface, and a cutting edge on the ridge line of the rake face and the flank face, The base material is composed of a composite structure in which fibrous materials in which the outer periphery of a long core material is covered with a skin material having a composition different from that of the core material, and the ratio of the following area S to diameter d (S / D ² ) is 2.8 × 10 ⁻⁶ to 2.8 × 10 ^−4, and includes a step of performing edge processing by honing the intersecting ridge line of the rake face and the flank face. .
S: In the cross section when the vicinity of the cutting edge is cut by a plane substantially perpendicular to the rake face, the actual cross section is removed from the virtual cross section formed by the intersection of the extension line from the rake face and the extension line from the flank face. Part area d: Diameter of the inscribed circle of the throw-away tip

  According to the throw-away tip of the present invention, by forming the base material with the composite structure described above, the fracture toughness of the base material itself can be increased, and the cutting edge processing amount and the surface roughness of the cutting edge processing surface can be reduced. By adjusting within the above range, it is possible to prevent a sudden defect in the cutting edge and reduce the cutting resistance to delay the progress of wear, thereby enabling stable cutting.

  The throw-away tip of the present invention is resistant to chipping without causing a large local impact on the cutting edge surface, especially in machining conditions where a large impact is applied to the cutting edge, such as heavy interrupted cutting used for high speed cutting or rough machining. While being able to improve property, the chipping which generate | occur | produces in a cutting blade can be suppressed in the state which maintained high abrasion resistance. Thereby, a long-life throw-away tip with excellent durability can be obtained.

  A throw-away tip according to an embodiment of the present invention will be described in detail with reference to the drawings. Fig.1 (a) is a top view which shows the throw away tip concerning this embodiment, FIG.1 (b) is the XX sectional drawing. 2 (a) and 2 (b) are enlarged cross-sectional views enlarging the vicinity C of the cutting edge surrounded by an alternate long and short dash line in FIG. 1 (b). Among these, Fig.2 (a) shows the example which performed the chamfer honing as a blade edge process, FIG.2 (b) shows the example which performed the R honing as a blade edge process.

  As shown in FIGS. 1 (a) and 1 (b), a throw-away tip (hereinafter simply referred to as a tip) 1 of this embodiment has a rake face 2 on the main surface (upper surface) and a flank 3 on the side surface. It consists of the base material which provided the cutting edge 4 in the intersection ridgeline of the rake face 2 and the flank 3. This chip 1 may be used as it is, and if necessary, a hard coating film is formed on the surface of the base material by a known surface coating method such as physical vapor deposition or chemical vapor deposition. May be.

In this chip 1, as shown in FIGS. 2A and 2B, the surface near the cutting edge 4 is perpendicular to the rake face 2, perpendicular to the tangent to the cutting edge 4, and passes through the center O of the chip 1. In the cross section when cut at, the area of the portion excluding the actual cross section from the virtual cross section formed by the intersection of the extension line L2 from the rake face 2 and the extension line L1 from the flank face 3 is S (mm ² ), When the diameter of the inscribed circle of 1 (in the case of FIG. 1A, the tip 1 is circular, the diameter of the inscribed circle is the same as the diameter of the tip 1) is defined as d (mm) (S / D ² ) is subjected to cutting edge processing so as to be 2.8 × 10 ⁻⁶ to 2.8 × 10 ^−4, and the arithmetic average roughness Ra of the cutting edge processing portion is 0.15 μm or less. It is processed as follows.

  As a result, chipping does not occur on the cutting edge 4 even under processing conditions in which a large impact is applied to the cutting edge 4 such as high-speed cutting or heavy interrupted cutting, and the cutting resistance can be reduced. Abrasion resistance can be improved.

When (S / d ² ) exceeds 2.8 × 10 ⁻⁴ , wear progresses faster, the service life is shortened, and chattering occurs due to an increase in cutting resistance. Problems such as lowering of the degree occur. Further, when (S / d ² ) is less than 2.8 × 10 ⁻⁶ , the cutting edge 4 is easily damaged.

  When calculating the area S corresponding to the cutting edge processing amount, when the planar shape of the chip 1 is circular (so-called round piece chip) as shown in FIG. And the average value of them shall be obtained.

  Further, in the case of a chip having a substantially rectangular planar shape with a nose portion as shown in FIG. 1C, the chip is perpendicular to the rake face 2, perpendicular to the tangent to the cutting edge 4, and the chip. 1 is calculated for a plurality of nose parts (preferably four nose parts) in a cross section cut along a plane passing through the center O of 1 and passing through the tip of the nose part (cross section taken along line yy in FIG. 1C). And the average value of them shall be obtained.

  Machining applied to the surface of the blade edge is performed by grinding with a diamond grindstone or the like and subsequent surface polishing with a brush or an elastic grindstone. By processing the surface of the chip 1 in this way, the arithmetic average roughness Ra can be adjusted to 0.15 μm or less.

  Although the composite structure used in the present invention is excellent in fracture toughness as a whole, the boundary between different materials can cause chipping in the surface portion such as a cutting edge because it takes a form in which different materials coexist. However, by increasing the processed surface roughness (arithmetic average roughness Ra) of the composite structure within the specified value, occurrence of chipping in the cutting edge can be prevented.

  The arithmetic average surface roughness Ra of the machined portion is measured using a contact-type surface roughness meter or using a non-contact type laser microscope, and the measurement surface is in the direction of laser irradiation of the laser microscope. Measurement is performed while moving the tip 1 so as to be vertical.

  In the above-mentioned blade edge processing, chamfer honing (FIG. 2 (a)) for chamfering the blade edge with a diamond grindstone or the like, and R honing for rounding the blade edge with an elastic grindstone, a brush or the like (FIG. 2 (b)). In the present invention, the cutting edge processing is chamfer honing, which improves the sharpness of the cutting edge 4 and reduces the cutting resistance, and more reliably suppresses chipping and chipping of the cutting edge 4 and stabilizes the tool. It is desirable in that a lifetime can be obtained.

In the case of chamfer honing, as shown in FIG. 2 (a), the length of the extension line from the rake face 2 (blade edge treatment width) is L _R , and the length of the extension line from the flank face 3 (blade edge treatment). If the width) was set to L _F, by which they satisfy the relation: _{L R ≧ (√3) L F} , the better the chip breakability interaction chamfer portion and the chip, reduce the cutting edge temperature rise This has the effect of suppressing damage to the blade edge.

  Next, the composite structure constituting the base material in the chip 1 will be described.

  The base material of the chip 1 is a single type in which the outer periphery of a long core material 6 as shown in FIGS. 3A and 3B is covered with a skin material 7 having a composition different from that of the core material 6. Composite fiber body (fibrous material) 5a or a composite structure in which multi-type composite fiber bodies (fibrous material) 5b are assembled (for example, composite structure 8a shown in FIGS. 4A to 4D) ~ 8d). By constituting the base material with such a composite structure, the fracture toughness of the base material itself can be enhanced.

  The composite fiber body 5 a is obtained by coating the outer periphery of a long core material 6 with a skin material 7 having a composition different from that of the core material 6. The composite fiber body 5b is obtained by extending an assembly of a plurality of single-type fiber bodies 5a. In the present invention, it is particularly preferable to use a multi-type composite fiber body 5b in terms of excellent impact absorbability.

  In addition, the structure of the composite structure can increase the filling rate of the composite fiber body 5a or 5b (hereinafter collectively referred to as the composite fiber body 5) to densify the structure, and has a high impact energy dispersion effect. In view of increasing the impact resistance, it is desirable to arrange the composite fiber bodies 5 in a regular direction as shown in FIGS. 4 (a) to 4 (c) (see composite structures 8a to 8c). In this case, the arrangement direction of the composite fiber body 5 may be arranged such that the adjacent upper and lower arrangement angles are the angle α as shown in FIG. Further, in terms of being able to slow the progress of cracks, exhibit higher toughness, and improve fracture resistance, it is not a method of arranging the composite fiber bodies 5 in a certain direction, but FIG. It is desirable to arrange so that the direction of the composite fiber body 5 is random as shown in (d) (see the composite structure 8d).

  The average particle size of the crystal particles of the sintered body constituting the core material 6 is the point of improving the hardness and strength of the composite fiber body 5 and the binder (bonding metal, sintering aid) in the core material 6 and the skin material 7. ) Is preferably 0.05 to 10 μm, particularly 0.1 to 3 μm, and on the other hand, the average particle size of the crystal particles constituting the skin material 7 is the toughness of the composite fiber body 4. In terms of improvement, it is desirable that the thickness is 0.01 to 5 μm, particularly 0.01 to 2 μm.

The core material 6 is selected from aluminum oxide (Al ₂ O ₃ ), silicon nitride (Si ₃ N ₄ ), silicon carbide (SiC), periodic table 4a, 5a, 6a group element carbide, nitride, carbonitride. It is preferable that it consists of the ceramics comprised by 1 type, or 2 or more types. The skin material 7 is made of ceramics having a composition different from that of the core material 6, and is selected from aluminum oxide, silicon nitride, silicon carbide, carbides of the periodic table 4a, 5a, and 6a group elements, nitride, and carbonitride. It is preferably made of ceramics composed of one kind or two or more kinds. Thereby, both wear resistance and chipping resistance can be improved, and the effects of the present invention can be further exhibited. In particular, ceramics mainly composed of silicon nitride or aluminum oxide are desirable from the viewpoint of increasing the hardness of the composite structure, increasing the wear resistance of the cutting tool, and improving the tool life.

(Production method)
Next, an example of a method for manufacturing the above-described chip of the present invention will be described with reference to FIG. First, 80 to 95% by weight of Al ₂ O ₃ powder having an average particle size of 0.1 to ₃ μm, 5 to 20% by weight of ZrO ₂ powder having an average particle size of 0.5 to 5 μm, and the above-mentioned auxiliary agents as desired. 0.5 to 1% by weight of the component powder is added and mixed at a predetermined ratio, and this is mixed with paraffin wax, polystyrene, polyethylene, ethylene-ethyl acrylate, ethylene-vinyl acetate, polybutyl methacrylate, polyethylene glycol, dibutyl. After adding and kneading an organic binder such as phthalate, a cylindrical core material molded body 12 is produced by a molding method such as press molding, extrusion molding or casting (FIG. 5 (a1)).

On the other hand, Si ₃ N ₄ powder 80 to 95% with an average particle size of 0.1 to ₃ μm, Al ₂ O ₃ powder with an average particle size of 0.3 μm to 5 to 10% by weight, and an average particle size of 0.5 to 5 μm. 2-10 wt% of Y ₂ O ₃ powder is added and mixed at a predetermined ratio, and the above-mentioned binder and the like are kneaded, and press molding, extrusion molding, casting molding, etc. The two half-cylindrical shaped moldings 13 for the skin material are produced by the molding method (FIG. 5 (a2)), and the molded body 13 for the skin material is covered with the outer circumference of the molded body 12 for the core material. The arranged composite molded body 14 is produced (FIG. 5 (a3)).

  Next, the composite molded body 14 is coextruded to produce a long composite molded body 15 that is elongated to a thin diameter in which a skin material is coated around the core material (FIG. 5B). In order to produce a multifilament structure (multi-type) structure, a plurality of the coextruded long composite molded bodies 15 are converged (bundled) and coextruded again to form a composite molded body 16. May be formed (FIG. 5C).

  Note that the elongated composite molded body 15 can be formed into a polygon such as a cylinder, a triangular prism, a quadrangular prism, or a hexagonal prism as desired. Further, as shown in FIGS. 4A to 4C illustrating the structure of the composite structure, the long composite molded body 15 is aligned to form a sheet, and the sheets are parallel to each other (FIG. 4 ( It is also possible to form a laminated body that is laminated so as to form a predetermined angle such as a)), direct (FIG. 4B) or an angle α (for example, 45 °) (FIG. 4C). Further, as shown in FIG. 4 (d) illustrating the configuration of the composite structure, the elongated composite molded body 15 (or the composite molded body 16) is cut into a size of about 1 mm to become granular. You may arrange things at random. After arrange | positioning like these, the molded object of the target shape can be obtained by press-molding at 100-200 degreeC.

  Moreover, it is also possible to shape | mold into arbitrary shapes by shaping | molding methods, such as a well-known rapid proto diving method. Furthermore, the above-described aligned sheet or a composite structure sheet obtained by slicing the sheet in the cross-sectional direction can be bonded to or bonded to the surface of a conventional hard alloy sintered body (lumped body) such as cemented carbide. is there.

  In addition to the above-described method, a composite core molded body as described above is manufactured by first preparing a fibrous core molded body and dipping (immersing and pulling it up) into the slurry for the skin material. You can also

  By the above method, the shape of the composite molded body itself is molded into a chip shape, or the composite molded body is produced and then cut into a desired chip shape. The composite structure according to the present embodiment may constitute the entire chip, and is brazed to a pedestal made of cemented carbide or the like that includes only the cutting edge portion (a pedestal in which only the cutting edge portion is cut). In some cases.

  Thereafter, the chip-shaped molded body is treated to remove the binder, and then fired at 1100 to 1900 ° C. in the air or in an inert gas atmosphere (for example, in Ar gas) to produce the composite structure in the present invention. it can. In firing, HIP firing may be performed at 1000 ° C. to 1900 ° C. if desired.

  Next, the rake face 2 of the sintered body is ground using a fine diamond wheel of # 200 or more. Thereafter, brushing is preferably performed by a well-known method using a polishing liquid and a brush mixed with diamond powder of 30 μm or less and a lubricating oil. Next, the outer peripheral (flank) portion is ground with a diamond wheel of # 500 or more. Finally, the chamfer part is processed using a diamond wheel of # 1000 or more. At this time, it adjusts so that the cutting edge processing amount of a cutting blade part may become the cutting edge processing amount in the range of the present invention.

  In addition, it is desirable that the cutting edge processing unit be machined in a direction perpendicular to the cutting edge 4 in that the direction of the processing flaw due to grinding coincides with the direction of the chip flow and the apparent fracture source can be reduced.

  Here, in order to make the surface roughness of the blade edge processing portion smoother, after performing the above-mentioned grinding process, the vicinity of the cutting edge is again a flexible brush such as a pig hair brush, and a diamond powder having an average particle size of 3 μm or less The surface roughness of the cutting edge 3 can be smoothed and a stable tool life can be obtained by polishing with a lubricant and adding a step of eliminating processing scratches due to grinding during the chamfering.

In the preferred production method of the present invention, the rake face and the flank face are ground, and the ratio of the following area S to diameter d (S / d ² ) is 2.8 × 10 ⁻⁶ to 2.8 × 10 ^−4. Honing the edge of the rake face and the flank so that the edge is processed, and cutting the edge so that the arithmetic average roughness Ra of the cutting edge is 0.15 μm or less. It consists of.

  Note that the throw-away tip of the present invention exerts a more remarkable effect by using it when cutting a heat-resistant alloy such as a nickel base alloy or a titanium alloy known as a difficult-to-cut material.

80% by weight of Al ₂ O ₃ particles having an average particle diameter of 0.3 μm, 19% by weight of ZrO ₂ particles having an average diameter of 0.5 μm, 0.5% by weight of NiO particles having an average particle diameter of 0.7 μm, and 0 of Co ₃ O ₄ particles The core material is formed of ceramic of 0.5% by weight, 87% by weight of Si ₃ N ₄ particles having an average particle diameter of 0.3 μm, ₃ % by weight of MgO particles having an average particle diameter of 0.8 μm, and 0.5% of the average particle diameter. A skin material was formed with 10% by weight of ZrO ₂ particles. At this time, the diameter of the minimum unit fibrous material was 20 μm, the length was 1 to 3 mm, and the fiber arrangement was random. This composite structure was fired with a hot press and then polished to produce an RNGN-shaped round piece chip having an inscribed circle diameter d of 12.7 mm.

Sample No. 5 is a uniform Al ₂ O ₃ sintered body consisting only of the composition of the core material. 6 is an Al ₂ O ₃ —SiC sintered body in which SiC whisker is added in addition to the core component. In addition, the sample No. composed of the composite structure was used. About 1-4, 7, and 8, it described as CF in the table | surface.

  The obtained chip was ground with a # 500 diamond wheel, and then the flank face was similarly ground with a # 500 diamond wheel. Thereafter, a chamfer honing process with a cutting edge processing amount (area S) shown in Table 1 was performed with # 1500 diamond. Finally, the chamfer part was polished with a brush that was easily bent, such as a pork brush, diamond powder having an average particle size of 3 μm or less, and a lubricant to smooth the processing scratches.

  Note that the cutting edge processing amount (area S) was cut at the XX line cross section shown in FIG. 1A after the cutting edge processing for the chip manufactured in the same manner as the above chip, and observed at 100 times with a metal microscope. It was measured. Moreover, the measurement of the cutting edge processing amount of the round piece chip was measured at five arbitrary positions, and the average value was calculated.

  The arithmetic average surface roughness (Ra) in the blade edge treated portion was measured at three locations, and the average value was calculated. The arithmetic average surface roughness Ra was measured for an area of 50 μm × 50 μm using an atomic force microscope (AFM).

  Cutting was performed with the above chip under the following conditions. The results are shown in Table 1.

<Cutting conditions>
Cutting speed: 300 m / min
Cutting depth: 1.0mm
Feed: 0.1mm / rev
Work material: Inconel 718
Cutting state: wet Cutting time: 10 minutes Evaluation item: Flank wear and cutting blade damage

From Table 1, the ratio (S / d ² ) between the area S (mm ² ) of the blade edge processing portion (removal portion) of the blade edge and the square of the diameter d (mm) of the inscribed circle is 2.8 × 10 ⁻⁴ . Sample no. In No. 5, the wear progressed quickly and the tool life was short. In addition, Sample No. with a polished surface having a surface roughness larger than 0.15 μm. In No. 7, the result was that the damage to the blade edge was large. In addition, the sample No. ^{2 in} which the ratio (S / d ² ) between the area S of the cutting edge processing portion and the square of the diameter of the inscribed circle is smaller than 2.8 × 10 ⁻⁶ . 8 resulted in a loss of cutting edge. Furthermore, sample No. which does not use the composite structure in the present invention. In Nos. 5 and 6, the toughness of the base material was low, and chipping and flaking were observed on the cutting edge.

  On the other hand, the sample No. included in the scope of the present invention. In 1-4, the abrasion resistance was good and the blade edge was not damaged.

(A) is a top view which shows the throw away tip concerning one Embodiment of this invention, (b) is the XX sectional drawing. (c) is a plan view showing a throw-away tip according to another embodiment of the present invention. (A), (b) is the expanded sectional view which expanded the cutting-blade vicinity C enclosed by the dashed-dotted line in FIG.1 (b). Among these, (a) shows the example which performed the chamfer honing as a blade edge process, (b) shows the example which performed the R honing as a blade edge process. (A) is a schematic perspective view which shows the single type (single core shape) composite fiber body (fibrous material) which comprises the throw-away tip concerning one Embodiment of this invention, (b) is multi-type. It is a schematic perspective view which shows the (multi-core) composite fiber body. (A) is a perspective view which shows the arrangement | positioning state of the composite fiber body at the time of producing the composite structure in one Embodiment of this invention, (b)-(d) shows the other arrangement | positioning state of a composite fiber body. It is a perspective view shown. (A1)-(c) is a schematic diagram which shows the manufacturing process of the composite structure which comprises the base material of the throw away tip of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Throw away tip 2 Rake face 3 Relief face 4 Cutting edge 5 Composite fiber body (fibrous material)
5a Single-core (single type) composite fiber body 5b Multi-core (multi-type) composite fiber body 6 Core material 7 Skin material 8a to 8d Composite structure 12 Core material molded body 13 Skin material molded body 14 Composite Molded body 15 Composite molded body after extrusion 16 Multi-type composite molded body S Cross-sectional area of part removed by blade edge processing (blade edge processing amount)
O Center of the throw-away tip LR Removal (blade edge treatment) width on the rake face of the _R chamfer part L Removal (blade edge treatment) width on the flank face of the _F chamfer part

Claims (6)

In the throw-away tip consisting of a base material having a rake face on the upper surface, a flank face on the side face, and a cutting edge on the ridge line of the rake face and the flank face,
The base material is composed of a composite structure in which fibrous materials in which the outer periphery of a long core material is covered with a skin material having a composition different from that of the core material,
In the cross section when the vicinity of the cutting edge is cut by a plane substantially perpendicular to the rake face, a portion of the virtual cross section obtained by intersecting the extension line from the rake face and the extension line from the flank face is excluded from the actual cross section. When the area is S and the diameter of the inscribed circle of the throw-away tip is d, the cutting edge processing is performed so that (S / d ² ) is 2.8 × 10 ⁻⁶ to 2.8 × 10 ^−4. A throw-away tip characterized in that the arithmetic average roughness Ra of the cutting edge processing portion is 0.15 μm or less. The core material is made of a ceramic composed of one or more selected from aluminum oxide, silicon nitride, silicon carbide, carbide of periodic table 4a, 5a, 6a group element, nitride, carbonitride, The said skin material consists of ceramics comprised by 1 type, or 2 or more types chosen from the carbide | carbonized_material, nitride, and carbonitride of an aluminum oxide, silicon nitride, silicon carbide, periodic table 4a, 5a, and 6a group element. The throw-away chip according to 1. The throw-away tip according to claim 1 or 2, wherein the cutting edge processing is chamfer honing. Lengths L _R of extension from the rake face in the chamfer _honing, when the length of the extension line from the flank to the L _F, these relationship L _R ≧ (√3) L _F The throw-away tip according to claim 3, which is satisfactory. A cutting method comprising cutting a super heat-resistant alloy using the throw-away tip according to claim 1. A method for producing a throw-away tip comprising a base material having a rake face on an upper surface, a flank face on a side face, and a cutting edge provided on an intersecting ridge line of the rake face and the flank face,
The base material is composed of a composite structure in which fibrous materials obtained by covering the outer periphery of a long core material with a skin material having a composition different from that of the core material,
The cutting edge processing is performed by honing the intersecting ridge line of the rake face and the flank face so that the ratio (S / d ² ) of the following area S and diameter d is 2.8 × 10 ⁻⁶ to 2.8 × 10 ^−4. A method of manufacturing a throw-away tip, comprising the step of:
S: In the cross section when the vicinity of the cutting edge is cut by a plane substantially perpendicular to the rake face, the actual cross section is removed from the virtual cross section formed by the intersection of the extension line from the rake face and the extension line from the flank face. Part area d: Diameter of the inscribed circle of the throw-away tip

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