JP4512078B2 - Replaceable cutting edge - Google Patents

Description

  The present invention relates to a cutting edge replaceable cutting tip (slow away tip) that is detachably attached to a cutting tool and used for cutting a work material.

  2. Description of the Related Art Conventionally, it has been performed to attach various types of work materials by attaching a cutting edge-replaceable cutting tip to a cutting tool so as to be detachable (Patent Documents 1 to 9). Such a blade-tip-exchangeable cutting tip is composed of a base material and a coating layer formed on the base material, and is attached to a cutting tool by inserting a pin, a screw, or the like into a through hole reaching from the upper surface to the lower surface of the base material. It is done.

In such a blade-tip-exchange-type cutting tip, since it is desired that the coating layer formed on the base material does not weld to the work material, alumina (Al ₂ O ₃ ) having excellent welding resistance is used as the outermost layer. There are many cases to do. However, when the outermost layer is alumina or the like, the appearance color is black (or a dark dark color), so it takes time to attach to a cutting tool at a cutting site where illumination is not sufficient because of poor visibility. There was a problem in the workability. In addition, it is extremely difficult to identify the type of cutting edge replaceable cutting tip from the black appearance color. Could occur. In order to prevent this, the type name may be written on the side of the blade-tip replaceable cutting tip. To check this character, the blade-tip replaceable cutting tip is taken out from the storage case of the blade-tip replaceable cutting tip one by one. It is inconvenient to confirm the condition at a cutting site where the illuminance is insufficient. In particular, when chip breakers having the same shape are formed for different types of blade-tip-exchangeable cutting tips, it has been very difficult to confirm the chip breaker.
Special table 2001-521991 gazette Japanese Patent Application Laid-Open No. 08-277181 JP 2002-144108 A JP 2004-122263 A JP 2004-122264 A JP 2004-216488 A JP 2004-195595 A JP 2001-347403 A JP-T 09-510507

  The present invention has been made in view of the above situation, and an object of the present invention is to provide a blade-tip-replaceable cutting tip having sufficient visibility even at a cutting site where illumination is not sufficient. There is.

  The cutting edge-exchangeable cutting tip of the present invention has a base material and a coating layer formed on the base material, and the base material has a through-hole that reaches from the upper surface to the lower surface, The upper surface or the lower surface includes a hole peripheral region that surrounds the periphery of the through-hole with a width of 3 mm or less, and an outer peripheral region that is the other region, and the coating layer is configured by a plurality of layers. The outermost layer of the covering layer in the peripheral region of the hole has a color different from that of the outermost layer of the covering layer in the outer peripheral region.

  In addition, the outermost layer in the hole peripheral region includes at least one element selected from the group consisting of group IVa elements, group Va elements, group VIa elements, Al, Si, and B of the periodic table, carbon, nitrogen, It is preferably a layer formed of a compound composed of at least one element selected from the group consisting of oxygen and boron, and includes at least one element of Ti or Zr and carbon, nitrogen, oxygen and boron. More preferably, the layer is formed of a compound composed of at least one element selected from the group consisting of:

In addition, the outermost layer in the outer peripheral region is preferably a layer containing Al ₂ O ₃ . Furthermore, it is preferable that the hole peripheral region can be identified by the shape of the region or the color of the outermost layer of the region.

  The blade-tip-exchangeable cutting tip of the present invention has a configuration as described above, and thus has sufficient visibility at a cutting site where illumination is not sufficient.

  Hereinafter, the present invention will be described in more detail. In the following description of the embodiments, the description is made with reference to the drawings. In the drawings of the present application, the same reference numerals denote the same or corresponding parts.

<Cutting edge type cutting tip>
The blade-tip-exchangeable cutting tip of the present invention has a base material and a coating layer formed on the base material. As shown in FIG. 1, such a blade-tip-exchangeable cutting tip 1 has a through-hole 4 that reaches the lower surface 3 from the upper surface 2 of the base material. It is located on the side that comes into contact with the chips when the work material is cut, and is called a rake face. Further, the side surface 7 intersecting the upper surface 2 and the lower surface 3 is located on the side in contact with the work material itself at the time of cutting, and this is called a flank surface. A portion corresponding to the ridge 8 where the rake face and the flank face intersect is referred to as a cutting edge ridge line portion, and is a portion mainly involved in cutting.

  Note that the ridge 8 can be chamfered or processed to have a rounded shape (R). Further, the upper surface 2 (and the lower surface 3) may have an uneven shape called a chip breaker, and the shape as a cutting tip may be a negative type or a positive type. Also good.

  Such a cutting edge-replaceable cutting tip of the present invention is, for example, for drilling, end milling, milling, turning, metal saw processing, gear cutting tool processing, reamer processing, tapping processing, or cranking. It can be applied to applications such as shaft pin milling.

  The expressions upper surface, lower surface, through-hole, side surface, ridge, rake surface, flank surface, and blade edge line portion used in the present invention are not used only for each component of the surface portion of the blade-tip-exchangeable cutting tip. It is also used for the surface and part relating to the substrate and the corresponding part for the coating layer.

<Base material>
The base material of this invention has a through-hole which reaches a lower surface from an upper surface. The cutting edge-exchangeable cutting tip of the present invention is attached to a cutting tool (for example, a cutting tool, a cutter, a holder, etc.) by inserting a pin, a screw or the like into this through hole. As the mounting method, for example, a clamp-on type, a lever lock type, a pin lock type, a screw type, and the like are known.

  Such a through-hole usually has a circular cross section (a cross section parallel to the upper surface or the lower surface) and is provided at the center of the upper surface, but is not limited thereto. When the cross-sectional shape is circular, the diameter is approximately 2 mm to 8 mm (for example, corresponding to a length of approximately 35 to 60% of the diameter of the inscribed circle on the upper surface of the chip), although it depends on the size of the cutting edge replaceable cutting tip itself. is there. Further, the height (depth) of the through hole is equal to the thickness of the blade-tip-exchangeable cutting tip. The diameter (shape) may be constant from the upper surface to the lower surface or may be different.

  As a material constituting such a base material, a conventionally known material known as a base material for a blade-tip-exchangeable cutting tip can be used without particular limitation. For example, cemented carbide (for example, WC-based cemented carbide, WC, Co and / or Ni, or further carbide, nitride, carbonitride such as Ti, Ta, Nb, Zr, Hf, Cr, V) Etc.), cermets (those mainly composed of TiC, TiN, TiCN, etc.), high speed steel, ceramics (titanium carbide, silicon carbide, silicon nitride, aluminum nitride, aluminum oxide, and mixtures thereof) Etc.), cubic boron nitride sintered bodies, diamond sintered bodies, silicon nitride sintered bodies, and the like can be given as examples of such base materials. When a cemented carbide is used as such a base material, the effect of the present invention is exhibited even if such a cemented carbide contains an abnormal phase called free carbon or ε phase in the structure.

  In addition, these base materials may have a modified surface. For example, in the case of cemented carbide, a de-β layer may be formed on the surface, or in the case of cermet, a surface hardened layer may be formed, and even if the surface is modified in this way, The effect is shown.

  The upper surface or the lower surface includes a hole peripheral region that surrounds the periphery of the through hole with a width of 3 mm or less, and an outer peripheral region that is the other region, details of which will be described later.

<Coating layer>
The coating layer of the present invention is formed on the base material and is formed for the purpose of improving the properties such as toughness and wear resistance and improving the durability (life) of the blade-tip replaceable cutting tip. It is what is done. In addition, although such a coating layer is formed on a base material, it may be formed with respect to the wall surface of the through-hole provided in the base material, and it is not formed. Also good. That is, the coating layer of the present invention is preferably formed so as to cover the entire surface of the base material, but includes a portion where the coating layer is not formed on the base material in the wall surface of the through-hole or other portions. However, it does not depart from the scope of the present invention.

  And the coating layer of this invention is comprised by several layers, and shall express the uppermost layer (namely, layer which comprises a surface) among each laminated | stacked layer as an outermost layer. Such a covering layer 11 is, as shown in FIGS. 2 and 3, for example, a hole peripheral region 5 that surrounds the periphery of the through hole 4 with a width of 3 mm or less on the upper surface 2 or the lower surface 3, and other regions. The outermost layer 6 is different in the configuration of the outermost layer, and thus the outermost layer has a different color. That is, in the coating layer 11 of the present invention, the outermost layer of the coating layer in the hole peripheral region has a color different from that of the outermost layer of the coating layer in the outer peripheral region.

  2 and 3, the outermost layer of the hole peripheral region 5 (the layer constituting the outermost layer may be referred to as a first outermost layer 21 for convenience. That is, in FIGS. 5 is the first outermost layer 21, which is the outermost layer in the outer peripheral region 6 (this layer is sometimes referred to as a second outermost layer 22 for convenience. In other words, in FIGS. 2 and 3, The outermost layer of the outer peripheral region 6 is formed in a state of being laminated on the second outermost layer 22), but the laminated state of the outermost layer of the present invention is not limited to such a mode. Absent. However, in consideration of the fact that the cutting edge-exchangeable cutting tip of the present invention is preferably manufactured by a manufacturing method as described later, the first outermost layer 21 and the second outermost layer 22 of the present invention are in such a laminated state. (It is not shown in FIG. 2 and FIG. 3 but includes the case where the lower layer 23 is formed between the first outermost layer 21 and the second outermost layer 22 as described below.) It can be said that this is an aspect.

  Moreover, the coating layer 11 of the present invention forms a lower layer 23 between the base material 10 and the outermost layer (second outermost layer) and / or between the first outermost layer 21 and the second outermost layer 22. However, even if the outermost layer is formed directly on the substrate, it does not depart from the scope of the present invention.

  The coating layer according to the present invention has such an outermost layer structure, and thus has an excellent effect of having sufficient visibility at a cutting site where illumination is not sufficient. For this reason, when attaching a chip | tip to cutting tools (For example, the tool which hold | maintains chips | tips, such as a cutting tool and a cutter), the time which the attachment requires can be reduced extremely. In addition, when a chip is placed on a work table or the like, the presence of the chip can be easily recognized, so that the possibility of accidentally dropping the chip from the work table can be effectively reduced. Therefore, the blade-tip-exchangeable cutting tip according to the present invention in which the outermost layer having such a structure is formed as the coating layer has extremely excellent work characteristics.

  Such a coating layer preferably has a thickness of 0.01 μm or more and 50 μm or less, more preferably an upper limit of 30 μm, still more preferably 20 μm, and a lower limit of 0.1 μm, still more preferably 1 μm. If it is less than 0.01 μm, the effect of improving the durability of the blade-tip-exchangeable cutting tip may not be sufficiently exhibited, and if it exceeds 50 μm, there may be no significant difference in the effect and it may be economically disadvantageous.

  Such a coating layer is preferably formed by a chemical vapor deposition method (vapor phase synthesis method) as described later, but is not limited thereto.

<Outermost layer around the hole>
In the coating layer of the present invention, the outermost layer in the hole peripheral region needs to have a different color from the outermost layer in the outer peripheral region. Thereby, the outstanding visibility can be exhibited.

  In particular, the outermost layer in the hole peripheral region preferably has a bright color such as gold or silver. Usually, the outermost layer of the outer peripheral region described later has a dark color such as black due to its composition, and therefore, by selecting such a bright color as the outermost layer color of the hole peripheral region, the outermost layer of the outer peripheral region is selected. A clear color contrast can be expressed with the outer layer. Thus, by forming a clear color contrast between the hole peripheral region and the outer peripheral region, extremely good visibility can be imparted.

  Here, the hole peripheral region is a region that surrounds the periphery of the through hole with a width of 3 mm or less on the upper surface or the lower surface, and this width (a width that forms the hole peripheral region so as to surround the periphery of the through hole, That is, the distance from the periphery of the through hole to the boundary with the outer peripheral region is more preferably 2.5 mm or less, and further preferably 2 mm or less. If it exceeds 3 mm, the effect of improving the visibility is lowered, and the cutting performance may be reduced due to the composition constituting the outermost layer, which is not preferable. On the other hand, as long as the hole peripheral region is formed, good visibility as described above is expressed, but if the width is less than 0.1 mm, the visibility may be insufficient, so the lower limit is 0.1 mm. The above is preferable.

  It should be noted that the width of the hole peripheral region is not necessarily the same over the entire region. As long as the width is 3 mm or less, a case where the width is partially less than 0.1 mm or 0 mm is included. This is because the effect of the present invention is exhibited even if the widths of the regions are not the same. It should be noted that even if a portion having a width exceeding 3 mm is included within a limited range due to manufacturing problems or the like, it does not depart from the scope of the present invention as long as the effect of the present invention is exhibited.

  As a composition constituting the outermost layer in the hole peripheral region, any composition known as a coating layer of a conventionally known blade-tip-exchangeable cutting tip may be used as long as it has a color different from that of the outermost layer in the outer peripheral region. It can employ | adopt and the composition is not specifically limited. For example, the outermost layer of such a hole peripheral region includes group IVa elements (Ti, Zr, Hf, etc.), group Va elements (V, Nb, Ta, etc.), group VIa elements (Cr, Mo, W, etc.) in the periodic table of elements. Etc.), at least one element selected from the group consisting of Al, Si, and B and at least one element selected from the group consisting of carbon, nitrogen, oxygen and boron. A layer is preferred.

Specific examples of the above compounds, for example TiC, TiN, TiCN, TiCNO, TiB 2, TiBN, TiBNO, TiCBN, Ti 2 O 3, TiZrCN, ZrC, ZrO 2, HfC, HfN, TiAlN, AlCrN, CrN, VN TiSiN, TiSiCN, AlTiCrN, TiAlCN, Al ₂ O ₃ , ZrCN, ZrCNO, AlN, AlCN, ZrN, TiAlC and the like.

  Among the compositions exemplified above, a layer formed by a compound composed of at least one element of Ti or Zr and at least one element selected from the group consisting of carbon, nitrogen, oxygen and boron The outermost layer is preferred. A compound composed of at least one element of Ti or Zr and at least one element selected from the group consisting of carbon, nitrogen, oxygen and boron has a color such as gold, and has a black color. This is because a clear color contrast can be expressed with the outermost layer in the outer peripheral region, which is often included, and particularly good visibility can be provided.

  In the present invention, when the compound is represented by a chemical formula, when the atomic ratio is not particularly limited, any conventionally known atomic ratio is included, and is not necessarily limited to the stoichiometric range. For example, when simply describing “TiCN”, the atomic ratio of “Ti”, “C”, and “N” is not limited to 50:25:25, and also when “TiN” is described, “Ti” and “N” The atomic ratio is not limited to 50:50. These atomic ratios include all conventionally known atomic ratios. These compounds may have different colors depending on their atomic ratio.

  The outermost layer in the peripheral region of the hole is not only formed of the above compound, but also from the group consisting of IVa group element, Va group element, VIa group element, Al, Si, and B in the periodic table of elements. It can also be constituted only by at least one element selected.

  The outermost layer in the hole peripheral region preferably has a thickness of 0.01 μm or more and 5 μm or less, more preferably an upper limit of 3 μm, still more preferably 1 μm, and a lower limit of 0.05 μm, still more preferably 0.1 μm. It is. If it is less than 0.01 μm, good visibility may not be exhibited, and if it exceeds 5 μm, there is a case where it is economically disadvantageous with no significant difference in the action.

<Further functions of hole peripheral area>
The hole peripheral area has the effect of exhibiting good visibility as described above due to the color contrast with the outer peripheral area, but the edge replacement type is possible depending on the shape of the hole peripheral area or the color of the outermost layer of this area. It can be designed to identify the type of cutting tip. Here, the type of the cutting edge-exchangeable cutting tip means variations such as the shape of the tip itself, the material of the base material, the composition of the coating layer, and the like. Variations in the shape of the chip itself include, for example, the presence or absence of a chip breaker, its shape, the size and shape of a corner portion (generally represented as a nose R), and the like.

  Since there are abundant types of such cutting edge-exchangeable cutting tips corresponding to applications and work materials, it is extremely effective if the type of the cutting edge-exchangeable cutting tip can be easily identified from its appearance. . However, since the blade-tip-exchangeable cutting tip is advantageous in that the outermost layer is made of alumina or the like having excellent welding resistance as described above, its external appearance is generally black. For this reason, there exists a problem that the kind of blade-tip-exchange-type cutting tip cannot be identified only at a glance.

  Therefore, the present invention solves the above-mentioned problem by enabling identification of the type of the cutting edge-exchangeable cutting tip in the hole peripheral region by the shape of the region or the color of the outermost layer of the region. That is, since the shape of the hole peripheral region or the color of the outermost layer of the hole peripheral region constitutes the characteristic appearance of the blade-tip-exchangeable cutting tip, these shapes or colors and the types of blade-tip-exchangeable cutting tips Thus, it is possible to identify the type of the blade-tip-exchangeable cutting tip very easily by simply looking at the appearance of the blade-tip-exchangeable cutting tip. In other words, the present invention provides an identification method for identifying the type of the cutting edge replaceable cutting tip by observing the shape of the peripheral region of the hole of the cutting edge replaceable cutting tip as described above or the color of the outermost layer in the region. It is to provide.

  Here, the shape of the hole peripheral region is a shape that is visually recognized by the color contrast with the outer peripheral region, and means a shape that appears mainly at the boundary portion with the outer peripheral region (the inner periphery of the hole peripheral region is the outline of the through hole). It is generally difficult to make a characteristic shape because they match.) However, the shape is not particularly limited as long as the shape falls within the range of the above width (thickness of 3 mm or less around the through hole). As such a shape, for example, a circular shape (the cross-sectional shape of the through-hole is usually circular unless otherwise specified, so the shape of the peripheral region of the hole in the present invention usually exhibits this circular shape (substantially circular shape)) and the outer peripheral region. That forms a boundary portion with the outer peripheral region in a sawtooth shape, one that forms a boundary portion with the outer peripheral region in a wavy pattern, and a outer peripheral region in a geometric pattern such as a polygon That constitute the boundary portion of the outer peripheral region in a petal pattern. In addition, the size of the width of the hole peripheral region is also included in the shape of the hole peripheral region. Further, the color of the hole peripheral region indicates the color of the outermost layer of the region.

  And, to correlate these shapes or colors and the types of cutting edge replaceable cutting tips, for example, those in which the chip breaker is formed as the types of cutting edge replaceable cutting tips, the shape is a sawtooth, Those in which the chip breaker is not formed is a mode in which the above shape is a circular shape, or the corner portion has a specific shape, the above color is gold, and the corner portion has a shape other than that The aspect etc. which make the said color silver are mentioned as the example. In the above-described aspect, it is of course possible to correlate both the shape and color of the hole peripheral region with the type of the cutting edge-exchangeable cutting tip.

<Outermost layer of outer peripheral area>
In the coating layer of the present invention, the outermost layer in the outer peripheral region needs to have a color different from that of the outermost layer in the hole peripheral region. Here, the outer peripheral region refers to a region other than the hole peripheral region on the upper surface or the lower surface, and it is this outer peripheral region that is usually involved in the cutting of the work material.

  As described above, as long as the outermost layer in the outer peripheral region has a color different from that of the outermost layer in the peripheral region of the hole, the composition thereof is not particularly limited, and the coating layer of a conventionally known cutting edge exchangeable cutting tip Any composition known as can be employed. For example, it can be formed of a compound similar to the compound listed as the compound constituting the outermost layer in the pore peripheral region.

However, the outermost layer in the outer peripheral region is particularly preferably a layer containing Al ₂ O ₃ . Since Al ₂ O ₃ has excellent resistance to the work material, the work material is not welded to the outer peripheral region, so that the work surface of the work material is in a good state like a mirror surface. This is because it can be finished. Moreover, since Al ₂ O ₃ has an appearance close to black, it has an advantage that a good color contrast can be easily provided with the outermost layer in the hole peripheral region.

Here, the layer containing Al ₂ O ₃ means that at least Al ₂ O ₃ is included as a part of the layer (if 50% by mass or more is included, it is considered that Al ₂ O ₃ is included). This means that it can contain ZrO ₂ , Y ₂ O ₃ (it can be considered that Zr or Y is added to Al ₂ O ₃ ), etc., and may contain chlorine, carbon, boron, nitrogen, etc. . On the other hand, the layer containing Al ₂ O ₃ includes a case where the entire composition excluding inevitable impurities is Al ₂ O ₃ . Incidentally, Al ₂ O ₃ is the crystal structure is not particularly limited, for example, _{α-Al 2 O 3, κ} -Al 2 O 3, with include γ-Al ₂ O ₃ or Al ₂ O ₃ in the amorphous state The state where these are mixed is also included. However, as Al ₂ O ₃ , α-Al ₂ O ₃ is particularly preferable. This is because it is particularly excellent in wear resistance.

  The outermost layer in the outer peripheral region preferably has a thickness of 0.1 μm or more and 20 μm or less, more preferably the upper limit is 15 μm, still more preferably 10 μm, and the lower limit is 0.5 μm, more preferably 1 μm. It is. If it is less than 0.1 μm, good abrasion resistance may not be exhibited, and if it exceeds 20 μm, there may be no significant difference in the action and it may be economically disadvantageous.

<Optimal combination of the outermost layer in the hole peripheral region and the outermost layer in the outer peripheral region>
As described above, the outermost layer in the hole peripheral region is formed of a compound composed of at least one element of Ti or Zr and at least one element selected from the group consisting of carbon, nitrogen, oxygen and boron. It is particularly preferable to employ a layer containing Al ₂ O ₃ as the outermost layer in the outer peripheral region. By adopting such a configuration, the color of the outermost layer in the peripheral region of the hole becomes bright, such as gold, and the outermost layer of the outer peripheral region is black, so that particularly excellent color contrast can be provided. It will be excellent in visibility. In addition, since the outer peripheral region involved in the cutting is composed of a layer containing Al ₂ O ₃ having excellent welding resistance of the work material, it has excellent cutting performance.

On the other hand, in order to make the colors of the two regions different from each other, the structure opposite to that described above, that is, the hole peripheral region is composed of a layer containing Al ₂ O ₃ and the outer peripheral region is at least one element of Ti or Zr. And a layer formed of a compound composed of at least one element selected from the group consisting of carbon, nitrogen, oxygen and boron. However, in such a configuration, although the visibility can be provided, the work material may be welded to the outer peripheral region depending on the use, which may not be preferable.

<Lower layer>
The coating layer of the present invention preferably forms a lower layer between the substrate and the outermost layer and / or between the first outermost layer and the second outermost layer. Thereby, the adhesiveness of a base material and an outermost layer and the adhesiveness of a 1st outermost layer and a 2nd outermost layer can further be improved. Such a lower layer can be formed of one or more layers, and the composition thereof is not particularly limited. For example, it can be formed of a compound similar to the compound constituting the outermost layer in the hole peripheral region. Examples of such compounds include TiN, TiCN, TiBN, TiBNO, TiC, ZrCN, TiZrCN, Ti ₂ O _{3 and the} like. In particular, when a layer containing Al ₂ O ₃ is formed as the outermost layer in the outer peripheral region, these compounds have adhesion between this layer and the substrate or adhesion between this layer and the outermost layer in the hole peripheral region. Can be suitably improved, which is preferable.

<Other configurations>
The above configuration of the coating layer of the present invention, particularly the configuration of the hole peripheral region and the outer peripheral region, may be configured on either the upper surface or the lower surface of the substrate, but is configured on both the upper surface and the lower surface. May be.

  For example, when the shape of the cutting edge-exchangeable cutting tip of the present invention is a positive type tip (the rake face and the flank face intersect at an acute angle), only the upper surface becomes a rake face, and therefore the above configuration only on the upper face. However, if the tip is a negative type chip (the rake face and the flank face intersect at an angle of 90 ° or more), both the upper face and the lower face can be rake faces. Therefore, the above-described configuration can be achieved on both the upper surface and the lower surface. In any case, as long as it is a surface where a through hole is formed, it is convenient for naming that either one surface is the upper surface and the other surface is the lower surface. It is not particularly limited.

  In addition, the structure of the coating layer in the side surface (flank face) of the present invention is not particularly limited, and any structure may be used. However, considering that it is preferably manufactured by the following manufacturing method, for example, as shown in FIG. 2, the configuration of the coating layer on the side surface 7 is the same as the configuration of the coating layer in the outer peripheral region. Is preferred.

<Manufacturing method>
The cutting edge-exchangeable cutting tip of the present invention can be manufactured as follows. That is, first, a coating layer is formed on a substrate by a chemical vapor deposition (CVD) method. In this case, as shown in FIG. 4, the lower layer 23 is formed on the entire surface of the substrate 10, the second outermost layer 22 is formed on the entire surface, and the first outermost layer 21 is formed on the entire surface. Form. Although not shown in FIG. 4, the second outermost layer 22 is further formed on the entire surface of the second outermost layer 22, and the first outermost layer 21 is formed on the entire surface of the lower layer 23. Further, a lower layer 23 may be formed between the first outermost layer 21 and the first outermost layer 21. In FIG. 4, the lower layer 23 is formed as one layer for convenience, but may be two or more layers.

In the above, the conditions of the chemical vapor deposition method are not particularly limited, and conventionally known conditions can be adopted. However, it is preferable that at least one layer of the lower layer 23 is formed by MT-CVD (medium temperature CVD) method, and it is optimal to include a TiCN (titanium carbonitride) layer having excellent wear resistance formed by this method. is there. The conventional CVD method forms a film at about 1020 to 1030 ° C., whereas the MT-CVD method can be performed at a relatively low temperature of about 850 to 950 ° C. This is because the damage can be reduced. Therefore, it is more preferable that the layer formed by the MT-CVD method is provided close to the substrate. Further, it is preferable to use a nitrile gas, particularly acetonitrile (CH ₃ CN), as the gas used in the film formation because of excellent mass productivity.

  Note that a multilayer structure in which a layer formed by the MT-CVD method as described above and a layer formed by an HT-CVD (high temperature CVD, conventional CVD) method are stacked. As a result, the adhesion between the layers of these coating layers may be improved and may be preferable. The coating layer can also be formed by physical vapor deposition (such as ion plating or sputtering).

  Next, as shown in FIG. 4, the opening portion of the through hole 4 is chucked (held) using, for example, the jig 20 with respect to the base material 10 having the coating layer formed on the entire surface as described above. In this case, a part of the jig 20 (the convex portion 25) is inserted into the through hole 4 and a portion other than the convex portion (a portion facing the base material 10 on which the coating layer is formed) is the hole peripheral region 5. (As long as it can cover the hole peripheral region 5 in this way, other means can be used in place of the jig 20. FIG. The state before the convex part 25 is inserted in the through-hole 4 is shown). In other words, the portion of the coating layer covered by the portion other than the convex portion 25 of the jig 20 becomes the hole peripheral region 5, and thus the width of the hole peripheral region 5 is the size of the above portion of the jig 20. It will be adjusted by. The shape of the hole peripheral region can also be adjusted by the shape of the jig 20 (outer shape facing the base material 10).

  Subsequently, in a state where the convex portion 25 of the jig 20 is inserted into the opening of the through hole 4 as described above, the portion of the first outermost layer 21 (second portion not covered with the jig 20 is rotated while the base material is rotated). When the lower layer 23 is formed between the outermost layer 22 and the first outermost layer 21, both the first outermost layer 21 and the lower layer 23 (the same applies hereinafter) are removed. Thereby, the first outermost layer 21 remains in the hole peripheral region 5 covered with the jig 20, whereas the second outermost layer is exposed on the surface in the outer peripheral region which is the other region, As a result, the cutting edge replacement type cutting tip of the present invention in which the color of the outermost layer is different between the hole peripheral region and the outer peripheral region is obtained. In other words, the blade-tip-exchangeable cutting tip obtained in this way is such that the outermost layer in the hole peripheral region is formed by the first outermost layer and the outermost layer in the outer peripheral region is formed by the second outermost layer.

  The step of removing the first outermost layer 21 preferably employs a brush method or a blast method. The brush method is a method of polishing using various brushes, and the blast method is a method of polishing by spraying various abrasive particles. However, it is not limited only to these methods, and a conventionally known method can be adopted. That is, as a method for removing the first outermost layer, a shot peening method, a barrel method, a polishing method using a buff cloth, or the like can be employed.

  In this way, the cutting edge replacement type cutting tip of the present invention can be manufactured with extremely high productivity.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited to these.

<Example 1>
First, a cemented carbide powder having a composition of 2.0% by mass of TiC, 3.0% by mass of TaC, 5.0% by mass of Co, and the balance of WC is pressed, followed by 1450 in a vacuum atmosphere. Sintering is performed at 1 ° C. for 1 hour, and then the blade edge processing is performed by SiC brush honing on the edge of the blade edge (the radius (R) is about 0.05 mm for each of the intersection of the upper surface / lower surface and the side surface) ) To obtain a base material for a cutting edge-replaceable cutting tip made of cemented carbide having the same shape as that of the cutting tip CNMA120408 (JIS B 4120-1998). This base material had one upper surface, one lower surface, and four side surfaces, and had a through-hole (diameter 5.16 mm) reaching the lower surface from the upper surface at the center of the upper surface. In addition, the 13-micrometer-thick removal beta layer was formed in the surface of this base material.

Next, the following coating layers were formed on the entire surface of the base material in order from the lower layer by a known thermal CVD method. That is, in order from the surface side of the substrate, a 0.5 μm TiN layer, a 7.5 μm TiCN layer (formed by MT-CVD method (film formation temperature 900 ° C.)), a 0.8 μm TiBN layer, a 4.2 μm layer An α-Al ₂ O ₃ layer and a 0.2 μm TiCN layer were formed. In this coating layer, a 0.5 μm TiN layer, a 7.5 μm TiCN layer, and a 0.8 μm TiBN layer are the lower layers, and a 4.2 μm α-Al ₂ O ₃ layer is the second outermost layer. The 0.2 μm TiCN layer on the surface is the first outermost layer. In this way, a blade-tip-exchangeable cutting tip corresponding to P10 defined by JIS B 4053-1998 was produced.

  And the following processing methods AG were implemented with respect to the blade-tip-exchange-type cutting tip produced in this way. Each blade-tip-exchangeable cutting tip obtained by applying treatment methods A, B, and C is an example of the present invention, and each blade-tip-exchangeable cutting tip obtained by applying treatment methods D, E, F, and G is It is a comparative example.

(Processing method A)
The above-described blade-tip-exchangeable cutting tip was chucked using the jig 20 as shown in FIG. That is, the convex portion 25 of the jig 20 was inserted into the through-hole 4 of the base material 10, and the chuck 20 was chucked so that the other portion (a portion other than the convex portion 25) of the jig 20 covered the hole peripheral region 5. Subsequently, processing is performed by a blasting method (wet blasting method in which alumina particles having an average particle diameter of 50 μm are sprayed at 0.2 MPa as abrasive particles) while rotating the base material 10 chucked by the jig 20 in this way. Thus, the first outermost layer other than the portion covered with the jig 20 was removed, and the second outermost layer was exposed to the portion to manufacture a blade-tip-exchangeable cutting tip. The blade-tip-exchangeable cutting tip thus obtained has a base material and a coating layer formed on the base material, and the base material has a through-hole that reaches from the upper surface to the lower surface. The upper surface and the lower surface include a hole peripheral region surrounding the periphery of the through-hole with a width of 0.3 to 1.2 mm, and an outer peripheral region that is the other region, and the covering layer includes a plurality of covering layers. The outermost layer (that is, the first outermost layer (pink in the case of the TiCN layer)) of the covering layer in the peripheral region of the hole is the outermost layer (that is, the second outermost layer) of the outer peripheral region. (A black color in the case of the α-Al ₂ O ₃ layer)). It should be noted that the width of the hole peripheral region is expressed with a range of 0.3 to 1.2 mm, although the hole peripheral region is precisely covered by the jig 20, but a part of the abrasive particles wrap around and is cured. This is because a part of the first outermost layer covered with the tool 20 has been removed (the same applies to the following processing methods).

(Processing method B)
In the processing method A, except that the width of the hole peripheral region was set to 0 to 0.9 mm by performing chucking using a different jig 20, the blade edge exchangeable cutting tip was the same as in the processing method A. (However, only a part of the width was 0 mm).

(Processing method C)
In the processing method A, the base material 10 (blade cutting type cutting tip) is chucked by the bolts 26 and nuts 27 shown in FIG. 5 instead of the jig 20 in FIG. 4, and the brush method (No. .320 diamond brush was used) to obtain a blade-tip-exchangeable cutting tip having a hole peripheral region width of 0.7 to 1.6 mm.

  FIG. 5 shows that the shaft portion of the bolt 26 is inserted into the through hole 4 of the base material 10 and chucked so that the head portion of the bolt 26 covers the hole peripheral region 5 (FIG. 5 Shows the state before fully chucking). Further, after the upper surface is first processed as shown in FIG. 5, the same processing is performed on the lower surface by performing the same processing with the upper and lower surfaces reversed (that is, by turning over the blade-tip-exchangeable cutting tip). .

(Processing method D)
In the processing method A, except that the processing by the blast method was not performed, the blade edge exchange type cutting tip was obtained in the same manner as in the processing method A. The entire surface of the cutting edge-exchangeable cutting tip is covered with the first outermost layer, and therefore the outermost layer in the hole peripheral region and the outermost layer in the outer peripheral region have the same color (that is, the color of the first outermost layer). It was.

(Processing method E)
In the processing method A, the first outermost layer is removed from the upper surface, the lower surface, and the side surface of the base material by performing the processing by the blast method on the upper surface, the lower surface, and the side surface of the base material without performing the chucking by the jig 20. Except for, a blade edge-exchangeable cutting tip was obtained in the same manner as in Processing Method A. The top, bottom and side surfaces of the cutting edge-exchangeable cutting tip are covered with the second outermost layer. Therefore, the outermost layer in the hole peripheral region and the outermost layer in the outer peripheral region have the same color (that is, the color of the second outermost layer). ).

(Processing method F)
Instead of the cutting edge replacement type cutting tip used in each of the above processing methods, except that the first outermost layer is not formed as a coating layer, all except that the cutting edge replacement type cutting tip having the same configuration is used, and each of the above processing methods No blasting or brushing process was performed. The top, bottom and side surfaces of the cutting edge-exchangeable cutting tip are covered with the second outermost layer. Therefore, the outermost layer in the hole peripheral region and the outermost layer in the outer peripheral region have the same color (that is, the color of the second outermost layer). ).

(Processing method G)
Except that the width of the peripheral area of the hole is 3.2 to 4.5 mm by chucking using a jig different from the jig 20 used in the processing method A, all the same as the processing method A Thus, a blade-tip-exchangeable cutting tip was obtained.

  Then, the following desorption test and cutting test were performed on each cutting edge-exchangeable cutting tip subjected to the above-described processes.

<Desorption test>
100 pieces of each of the above-mentioned blade edge exchangeable cutting tips were prepared. And about each 100 blade-tip-exchange-type cutting tip, attachment and removal were performed with respect to the holder PTLNR2525-43 (made by Sumitomo Electric Hardmetal Co., Ltd.) attached to the collet of the machine tool. 200 lux). Each blade-tip-exchange-type cutting tip had four corners with apex angles of 80 °, and such attachment and removal were performed a total of 400 times, and the required time and the number of times the tip dropped from the work table were measured. The results are shown in Table 1 below.

<Cutting test>
Each of the above-mentioned blade edge-exchangeable cutting tips was prepared. Then, each blade edge replaceable cutting tip is attached to a holder (same as that used in the above-mentioned detachment test) attached to a collet of a machine tool, and a flank average is obtained by performing a cutting test under the following conditions. The amount of wear (V _B ) was measured. The results are shown in Table 1 below. The smaller the flank average wear amount, the better the wear resistance.

(Cutting conditions)
Work material: SCM440
Cutting speed: 215 m / min Feed: 0.35 mm / rev.
Cutting depth: 2.0mm
Dry / Wet: Wet (water-soluble oil)
Cutting time: 10 minutes

  As apparent from Table 1 above, the cutting edge replacement type cutting tip of the example had a shorter time required for detachment and the number of times the chip dropped from the workbench compared to the cutting edge replacement type cutting tip of the comparative example. It was confirmed that it was excellent in visibility. Furthermore, since all of the blade-tip-exchangeable cutting tips of the examples had a small flank average wear amount, it was confirmed that the wear resistance and toughness of the coating layer were good.

<Example 2>
First, cemented carbide powder having a composition of 3.0% by mass of TiC, 3.0% by mass of TaC, 0.5% by mass of NbC, 8.0% by mass of Co, and the balance of WC is pressed. Then, sintering is performed in a vacuum atmosphere at 1450 ° C. for 1 hour, and then the edge of the blade edge is processed by SiC brush honing (the radius of each intersection of the upper surface / lower surface and the side surface is increased). By applying a round (R) of about 0.05 mm, a base material of a cutting edge replacement type cutting tip made of cemented carbide having the same shape as the cutting tip CNMA120408 (JIS B 4120-1998) is obtained. It was. This base material had one upper surface, one lower surface, and four side surfaces, and had a through-hole (diameter 5.16 mm) reaching the lower surface from the upper surface at the center of the upper surface. Note that a deβ layer having a thickness of 21 μm was formed on the surface of the substrate.

Next, the following coating layers were formed on the entire surface of the base material in order from the lower layer by a known thermal CVD method. That is, in order from the surface side of the substrate, a 0.4 μm TiN layer, a 6.1 μm TiCN layer (formed by an MT-CVD method (deposition temperature 900 ° C.)), a 0.2 μm TiAlON layer, a 3.3 μm An α-Al ₂ O ₃ layer and a 0.2 μm TiCN layer were formed. In this coating layer, a 0.4 μm TiN layer, a 6.1 μm TiCN layer, and a 0.2 μm TiAlON layer are the lower layers, and a 3.3 μm α-Al ₂ O ₃ layer is the second outermost layer. The 0.2 μm TiCN layer on the surface is the first outermost layer. In this way, a blade-tip-exchangeable cutting tip corresponding to P20 defined by JIS B 4053-1998 was produced.

  And the processing methods AG similar to Example 1 were each implemented with respect to the blade-tip-exchange-type cutting tip produced in this way. Each blade-tip-exchangeable cutting tip obtained by applying treatment methods A, B, and C is an example of the present invention, and each blade-tip-exchangeable cutting tip obtained by applying treatment methods D, E, F, and G is It is a comparative example.

  Then, the same desorption test as in Example 1 and the following cutting test were performed on each of the blade-tip-exchangeable cutting tips. These results are shown in Table 2 below.

<Cutting test>
Each of the above-mentioned blade edge-exchangeable cutting tips was prepared. Then, by attaching one cutting edge exchangeable cutting tip to a holder (same as that used in the detachment test of Example 1) attached to the collet of the machine tool, and performing a cutting test under the following conditions The average flank wear (V _B ) was measured. The smaller the flank average wear amount, the better the wear resistance.

(Cutting conditions)
Work material: SCM435 (grooved material)
Cutting speed: 245 m / min Feed: 0.32 mm / rev.
Cutting depth: 2.0mm
Dry / Wet: Wet (water-soluble oil)
Cutting time: 15 minutes

  As is clear from Table 2 above, the cutting edge replacement type cutting tip of the example had a shorter time required for detachment and the number of times that the tip dropped from the workbench compared to the cutting edge replacement type cutting tip of the comparative example. It was confirmed that it was excellent in visibility. Furthermore, since all of the blade-tip-exchangeable cutting tips of the examples had a small flank average wear amount, it was confirmed that the wear resistance and toughness of the coating layer were good.

<Example 3>
First, cemented carbide powder having a composition of 0.5% by mass of TiC, 2.0% by mass of TaC, 10.0% by mass of Co, and the balance of WC is pressed, followed by 1450 in a vacuum atmosphere. Sintering is performed at 1 ° C. for 1 hour, and then the blade edge processing is performed by SiC brush honing on the edge of the blade edge (the radius (R) is about 0.05 mm for each of the intersection of the upper surface / lower surface and the side surface) ) To obtain a base material for a cutting edge-replaceable cutting tip made of cemented carbide having the same shape as that of the cutting tip CNMA120408 (JIS B 4120-1998). This base material had one upper surface, one lower surface, and four side surfaces, and had a through-hole (diameter 5.16 mm) reaching the lower surface from the upper surface at the center of the upper surface. In addition, the 12-micrometer-thick removal beta layer was formed in the surface of this base material.

Next, the following coating layers were formed on the entire surface of the base material in order from the lower layer by a known thermal CVD method. That is, in order from the surface side of the substrate, a 0.4 μm TiN layer, a 4.3 μm TiCN layer (formed by an MT-CVD method (film formation temperature 900 ° C.)), a 0.4 μm TiN layer, a 2.1 μm An α-Al ₂ O ₃ layer and a 0.2 μm TiCN layer were formed. In this coating layer, a 0.4 μm TiN layer, a 4.3 μm TiCN layer, and a 0.4 μm TiN layer are the lower layers, and a 2.1 μm α-Al ₂ O ₃ layer is the second outermost layer. The 0.2 μm TiCN layer on the surface is the first outermost layer. In this way, a blade-tip-exchangeable cutting tip corresponding to P30 defined by JIS B 4053-1998 was produced.

  And the processing methods AG similar to Example 1 were each implemented with respect to the blade-tip-exchange-type cutting tip produced in this way. Each blade-tip-exchangeable cutting tip obtained by applying treatment methods A, B, and C is an example of the present invention, and each blade-tip-exchangeable cutting tip obtained by applying treatment methods D, E, F, and G is It is a comparative example.

  Then, the same desorption test as in Example 1 and the following cutting test were performed on each of the blade edge-exchangeable cutting tips. These results are shown in Table 3 below.

<Cutting test>
Each of the above-mentioned blade edge-exchangeable cutting tips was prepared. Then, by attaching one cutting edge exchangeable cutting tip to a holder (same as that used in the detachment test of Example 1) attached to the collet of the machine tool, and performing a cutting test under the following conditions The average flank wear (V _B ) was measured. The smaller the flank average wear amount, the better the wear resistance.

(Cutting conditions)
Work material: SCM415 (grooved material)
Cutting speed: 315 m / min Feed: 0.33 mm / rev.
Cutting depth: 2.0mm
Dry / Wet: Dry cutting time: 13 minutes

  As is clear from Table 3 above, the cutting edge replacement type cutting tip of the example had a shorter time required for detachment and the number of times the chip dropped from the workbench compared to the cutting edge replacement type cutting tip of the comparative example. It was confirmed that it was excellent in visibility. Furthermore, since all of the blade-tip-exchangeable cutting tips of the examples had a small flank average wear amount, it was confirmed that the wear resistance and toughness of the coating layer were good.

<Example 4>
First, cemented carbide powder having a composition of 1.3% by mass of TiC, 2.0% by mass of TaC, 1.0% by mass of NbC, 5.5% by mass of Co, and the balance of WC is pressed. Then, sintering is performed in a vacuum atmosphere at 1450 ° C. for 1 hour, and then the edge of the blade edge is processed by SiC brush honing (the radius of each intersection of the upper surface / lower surface and the side surface is increased). By applying a round (R) of about 0.05 mm, a base material of a cutting edge replacement type cutting tip made of cemented carbide having the same shape as the cutting tip CNMA120408 (JIS B 4120-1998) is obtained. It was. This base material had one upper surface, one lower surface, and four side surfaces, and had a through-hole (diameter 5.16 mm) reaching the lower surface from the upper surface at the center of the upper surface. In addition, a deβ layer having a thickness of 11 μm was formed on the surface of the substrate.

Next, the following coating layers were formed on the entire surface of the base material in order from the lower layer by a known thermal CVD method. That is, in order from the surface side of the substrate, a 0.3 μm TiN layer, a 4.5 μm TiZrCN layer, a 0.4 μm TiBN layer, a 2.3 μm α-Al ₂ O ₃ layer, a 0.3 μm ZrN layer ( Yellowish silver). In this coating layer, a 0.3 μm TiN layer, a 4.5 μm TiZrCN layer, and a 0.4 μm TiBN layer are the lower layers, and a 2.3 μm α-Al ₂ O ₃ layer is the second outermost layer. The surface 0.3 μm ZrN layer is the first outermost layer. In this way, a blade-tip-exchangeable cutting tip corresponding to M10 defined by JIS B 4053-1998 was produced.

  And the processing methods AG similar to Example 1 were each implemented with respect to the blade-tip-exchange-type cutting tip produced in this way. Each blade-tip-exchangeable cutting tip obtained by applying treatment methods A, B, and C is an example of the present invention, and each blade-tip-exchangeable cutting tip obtained by applying treatment methods D, E, F, and G is It is a comparative example.

  Then, the same desorption test as in Example 1 and the following cutting test were performed on each of the blade edge-exchangeable cutting tips. These results are shown in Table 4 below.

<Cutting test>
Each of the above-mentioned blade edge-exchangeable cutting tips was prepared. Then, by attaching one cutting edge exchangeable cutting tip to a holder (same as that used in the detachment test of Example 1) attached to the collet of the machine tool, and performing a cutting test under the following conditions The average flank wear (V _B ) was measured. The smaller the flank average wear amount, the better the wear resistance.

(Cutting conditions)
Work material: SUS304
Cutting speed: 185 m / min Feed: 0.25 mm / rev.
Cutting depth: 2.0mm
Dry / Wet: Wet (water-soluble oil)
Cutting time: 8 minutes

  As is clear from Table 4 above, the cutting edge replacement type cutting tip of the example was shorter in the time required for detachment and the number of times that the tip dropped from the workbench than the cutting edge replacement type cutting tip of the comparative example. It was confirmed that it was excellent in visibility. Furthermore, since all of the blade-tip-exchangeable cutting tips of the examples had a small flank average wear amount, it was confirmed that the wear resistance and toughness of the coating layer were good.

<Example 5>
First, cemented carbide powder having a composition of 2.0% by mass of TaC, 10.0% by mass of Co, and the balance of WC is pressed, followed by firing in a vacuum atmosphere at 1450 ° C. for 1 hour. After that, the blade edge processing is performed on the edge portion of the blade edge by SiC brush honing treatment (the surface (R) having a radius of about 0.05 mm is applied to each of the intersection between the upper surface / lower surface and the side surface). Thereby, the base material of the cutting-tip-exchange-type cutting tip made of cemented carbide having the same shape as that of the cutting tip CNMA120408 (JIS B 4120-1998) was obtained. This base material had one upper surface, one lower surface, and four side surfaces, and had a through-hole (diameter 5.16 mm) reaching the lower surface from the upper surface at the center of the upper surface. It should be noted that a β-free layer was not formed on the surface of this substrate.

Next, the following coating layers were formed on the entire surface of the base material in order from the lower layer by a known thermal CVD method. That is, in order from the surface side of the substrate, a 0.3 μm TiN layer, a 3.8 μm TiCN layer (formed by MT-CVD method (film formation temperature 900 ° C.)), a 0.5 μm TiBN layer, and a 2.2 μm TiBN layer An α-Al ₂ O ₃ layer and a 0.2 μm ZrN layer (yellowish silver) were formed. In this coating layer, a 0.3 μm TiN layer, a 3.8 μm TiCN layer, and a 0.5 μm TiBN layer are the lower layers, and a 2.2 μm α-Al ₂ O ₃ layer is the second outermost layer. The 0.2 μm ZrN layer on the surface is the first outermost layer. In this way, a blade-tip-exchangeable cutting tip corresponding to M30 defined by JIS B 4053-1998 was produced.

  And the processing methods AG similar to Example 1 were each implemented with respect to the blade-tip-exchange-type cutting tip produced in this way. Each blade-tip-exchangeable cutting tip obtained by applying treatment methods A, B, and C is an example of the present invention, and each blade-tip-exchangeable cutting tip obtained by applying treatment methods D, E, F, and G is It is a comparative example.

  Then, the same desorption test as in Example 1 and the following cutting test were performed on each of the blade edge-exchangeable cutting tips. These results are shown in Table 5 below.

<Cutting test>
Each of the above-mentioned blade edge-exchangeable cutting tips was prepared. Then, by attaching one cutting edge exchangeable cutting tip to a holder (same as that used in the detachment test of Example 1) attached to the collet of the machine tool, and performing a cutting test under the following conditions The average flank wear (V _B ) was measured. The smaller the flank average wear amount, the better the wear resistance.

(Cutting conditions)
Work material: SUS316
Cutting speed: 130 m / min Feed: 0.27 mm / rev.
Cutting depth: 2.0mm
Dry / Wet: Wet (water-soluble oil)
Cutting time: 10 minutes

  As is clear from Table 5 above, the cutting edge replacement type cutting tip of the example had a shorter time required for detachment and the number of times the chip dropped from the workbench compared to the cutting edge replacement type cutting tip of the comparative example. It was confirmed that it was excellent in visibility. Furthermore, since all of the blade-tip-exchangeable cutting tips of the examples had a small flank average wear amount, it was confirmed that the wear resistance and toughness of the coating layer were good.

<Example 6>
First, cemented carbide powder having a composition of 0.3% by mass of TiC, 0.3% by mass of TaC, 0.2% by mass of NbC, 5.0% by mass of Co, and the balance of WC is pressed. Then, sintering is performed in a vacuum atmosphere at 1450 ° C. for 1 hour, and then the edge of the blade edge is processed by SiC brush honing (the radius of each intersection of the upper surface / lower surface and the side surface is increased). By applying a round (R) of about 0.05 mm, a base material of a cutting edge replacement type cutting tip made of cemented carbide having the same shape as that of the cutting tip CNMA1201212 (JIS B 4120-1998) is obtained. It was. This base material had one upper surface, one lower surface, and four side surfaces, and had a through-hole (diameter 5.16 mm) reaching the lower surface from the upper surface at the center of the upper surface. In addition, the de-β layer was not formed on the surface of this base material.

Next, the following coating layers were formed on the entire surface of the base material in order from the lower layer by a known thermal CVD method. That is, in order from the surface side of the substrate, a 0.6 μm TiN layer, a 10.5 μm TiCN layer (formed by an MT-CVD method (film formation temperature 900 ° C.)), a 0.1 μm TiAlON layer, a 6.5 μm An α-Al ₂ O ₃ layer, a 0.5 μm Ti ₂ O ₃ layer, and a 0.5 μm TiN layer (yellow as the appearance color) were formed. In this coating layer, a 0.6 μm TiN layer, a 10.5 μm TiCN layer, a 0.1 μm TiAlON layer, and a 0.5 μm Ti ₂ O ₃ layer are the lower layers, and a 6.5 μm α-Al ₂ O _{3 layer.} The layer is the second outermost layer, and the 0.5 μm TiN layer on the outermost surface is the first outermost layer. In this way, a blade-tip-exchangeable cutting tip corresponding to K10 defined by JIS B 4053-1998 was produced.

  And the processing methods AG similar to Example 1 were each implemented with respect to the blade-tip-exchange-type cutting tip produced in this way. Each blade-tip-exchangeable cutting tip obtained by applying treatment methods A, B, and C is an example of the present invention, and each blade-tip-exchangeable cutting tip obtained by applying treatment methods D, E, F, and G is It is a comparative example.

In the processing methods A, B, C, E, and G of Example 1, the operation of removing the first outermost layer is performed by the first outermost layer and the Ti ₂ O ₃ layer (first outermost layer and second outermost layer). And the lower layer formed between them. Further, in the processing method F, if the first outermost layer is not formed, a portion where the first outermost layer and the Ti ₂ O ₃ layer (the lower layer formed between the first outermost layer and the second outermost layer) are formed. It shall not be formed.

  Then, the same desorption test as in Example 1 and the following cutting test were performed on each of the blade edge-exchangeable cutting tips. These results are shown in Table 6 below.

<Cutting test>
Each of the above-mentioned blade edge-exchangeable cutting tips was prepared. Then, by attaching one cutting edge exchangeable cutting tip to a holder (same as that used in the detachment test of Example 1) attached to the collet of the machine tool, and performing a cutting test under the following conditions The average flank wear (V _B ) was measured. The smaller the flank average wear amount, the better the wear resistance.

(Cutting conditions)
Work material: FCD600
Cutting speed: 200 m / min Feed: 0.30 mm / rev.
Cutting depth: 2.0mm
Dry / Wet: Wet (water-soluble oil)
Cutting time: 10 minutes

  As is clear from Table 6 above, the cutting edge replacement type cutting tip of the example had a shorter time required for detachment and the number of times the chip dropped from the workbench compared to the cutting edge replacement type cutting tip of the comparative example. It was confirmed that it was excellent in visibility. Furthermore, since all of the blade-tip-exchangeable cutting tips of the examples had a small flank average wear amount, it was confirmed that the wear resistance and toughness of the coating layer were good.

<Example 7>
First, cemented carbide powder having a composition of 1.5% by mass of TiC, 2.5% by mass of TaC, 6.5% by mass of Co, and the balance of WC is pressed, followed by 1450 in a vacuum atmosphere. Sintering is performed at 1 ° C. for 1 hour, and then the blade edge processing is performed by SiC brush honing on the edge of the blade edge (the radius (R) is about 0.05 mm for each of the intersection of the upper surface / lower surface and the side surface) ) Was obtained, thereby obtaining a base material of a cutting edge-replaceable cutting tip made of cemented carbide having the same shape as that of the cutting tip CNMA1201212 (JIS B 4120-1998). This base material had one upper surface, one lower surface, and four side surfaces, and had a through-hole (diameter 5.16 mm) reaching the lower surface from the upper surface at the center of the upper surface. In addition, a deβ layer having a thickness of 16 μm was formed on the surface of the base material.

Next, the following coating layers were formed on the entire surface of the base material in order from the lower layer by a known thermal CVD method. That is, in order from the surface side of the substrate, a 0.3 μm TiN layer, a 7.6 μm TiCN layer (formed by an MT-CVD method (deposition temperature 900 ° C.)), a 0.4 μm TiBN layer, a 4.3 μm An α-Al ₂ O ₃ layer, a 0.5 μm Ti ₂ O ₃ layer, and a 0.5 μm TiN layer (yellow as the appearance color) were formed. In this coating layer, a 0.3 μm TiN layer, a 7.6 μm TiCN layer, a 0.4 μm TiBN layer, and a 0.5 μm Ti ₂ O ₃ layer are the lower layers, and 4.3 μm α-Al ₂ O _3. The layer is the second outermost layer, and the 0.5 μm TiN layer on the outermost surface is the first outermost layer. In this way, a blade-tip-exchangeable cutting tip corresponding to K20 defined by JIS B 4053-1998 was produced.

  And the processing methods AG similar to Example 1 were each implemented with respect to the blade-tip-exchange-type cutting tip produced in this way. Each blade-tip-exchangeable cutting tip obtained by applying treatment methods A, B, and C is an example of the present invention, and each blade-tip-exchangeable cutting tip obtained by applying treatment methods D, E, F, and G is It is a comparative example.

In the processing methods A, B, C, E, and G of Example 1, the operation of removing the first outermost layer is performed by the first outermost layer and the Ti ₂ O ₃ layer (first outermost layer and second outermost layer). And the lower layer formed between them. Further, in the processing method F, if the first outermost layer is not formed, a portion where the first outermost layer and the Ti ₂ O ₃ layer (the lower layer formed between the first outermost layer and the second outermost layer) are formed. It shall not be formed.

  Then, the same desorption test as in Example 1 and the following cutting test were performed on each of the blade edge-exchangeable cutting tips. These results are shown in Table 7 below.

<Cutting test>
Each of the above-mentioned blade edge-exchangeable cutting tips was prepared. Then, by attaching one cutting edge exchangeable cutting tip to a holder (same as that used in the detachment test of Example 1) attached to the collet of the machine tool, and performing a cutting test under the following conditions The average flank wear (V _B ) was measured. The smaller the flank average wear amount, the better the wear resistance.

(Cutting conditions)
Work material: FC250
Cutting speed: 320 m / min Feed: 0.35 mm / rev.
Cutting depth: 2.0mm
Dry / Wet: Wet (water-soluble oil)
Cutting time: 15 minutes

  As is clear from Table 7 above, the cutting edge replacement type cutting tip of the example was shorter in the time required for detachment and the number of times that the tip dropped from the workbench than the cutting edge replacement type cutting tip of the comparative example. It was confirmed that it was excellent in visibility. Furthermore, since all of the blade-tip-exchangeable cutting tips of the examples had a small flank average wear amount, it was confirmed that the wear resistance and toughness of the coating layer were good.

<Example 8>
First, a cemented carbide powder having a composition of 0.5 mass% Cr ₃ C ₂ , 10.0 mass% Co, and the balance of WC is pressed, followed by 1450 ° C. for 1 hour in a vacuum atmosphere. Sintering was performed under the conditions, and then the edge of the edge of the edge was treated by SiC brush honing treatment (R (R) having a radius of about 0.05 mm for each of the intersection of the upper surface / lower surface and the side surface) ) To obtain a base material of a cutting edge-exchangeable cutting tip made of cemented carbide having the same shape as that of the cutting tip CNMA1201212 (JIS B 4120-1998). This base material had one upper surface, one lower surface, and four side surfaces, and had a through-hole (diameter 5.16 mm) reaching the lower surface from the upper surface at the center of the upper surface. In addition, the de-β layer was not formed on the surface of this base material.

Next, the following coating layers were formed on the entire surface of the base material in order from the lower layer by a known thermal CVD method. That is, in order from the surface side of the base material, a 0.3 μm TiN layer, a 2.4 μm TiCN layer (formed by an MT-CVD method (film formation temperature 900 ° C.)), a 0.4 μm TiBN layer, a 4.3 μm An α-Al ₂ O ₃ layer, a 0.5 μm Ti ₂ O ₃ layer, and a 0.5 μm TiN layer (yellow as the appearance color) were formed. In this coating layer, a 0.3 μm TiN layer, a 2.4 μm TiCN layer, a 0.4 μm TiBN layer, and a 0.5 μm Ti ₂ O ₃ layer are the lower layers, and 4.3 μm α-Al ₂ O _3. The layer is the second outermost layer, and the 0.5 μm TiN layer on the outermost surface is the first outermost layer. In this way, a blade-tip-exchangeable cutting tip corresponding to K30 defined by JIS B 4053-1998 was produced.

  And the processing methods AG similar to Example 1 were each implemented with respect to the blade-tip-exchange-type cutting tip produced in this way. Each blade-tip-exchangeable cutting tip obtained by applying treatment methods A, B, and C is an example of the present invention, and each blade-tip-exchangeable cutting tip obtained by applying treatment methods D, E, F, and G is It is a comparative example.

In the processing methods A, B, C, E, and G of Example 1, the operation of removing the first outermost layer is performed by the first outermost layer and the Ti ₂ O ₃ layer (first outermost layer and second outermost layer). And the lower layer formed between them. Further, in the processing method F, if the first outermost layer is not formed, a portion where the first outermost layer and the Ti ₂ O ₃ layer (the lower layer formed between the first outermost layer and the second outermost layer) are formed. It shall not be formed.

  Then, the same desorption test as in Example 1 and the following cutting test were performed on each of the blade edge-exchangeable cutting tips. These results are shown in Table 8 below.

<Cutting test>
Each of the above-mentioned blade edge-exchangeable cutting tips was prepared. Then, by attaching one cutting edge exchangeable cutting tip to a holder (same as that used in the detachment test of Example 1) attached to the collet of the machine tool, and performing a cutting test under the following conditions The average flank wear (V _B ) was measured. The smaller the flank average wear amount, the better the wear resistance.

(Cutting conditions)
Work material: FCD500 (grooving material)
Cutting speed: 165 m / min Feed: 0.35 mm / rev.
Cutting depth: 2.0mm
Dry / Wet: Dry cutting time: 15 minutes

  As is clear from Table 8 above, the cutting edge-replaceable cutting tip of the example had a shorter time required for detachment and the number of times that the chip dropped from the workbench compared to the cutting edge-replaceable cutting tip of the comparative example. It was confirmed that it was excellent in visibility. Furthermore, since all of the blade-tip-exchangeable cutting tips of the examples had a small flank average wear amount, it was confirmed that the wear resistance and toughness of the coating layer were good.

  In addition, the blade-tip-exchangeable cutting tips of Examples 1 to 8 described above (the processing methods A, B, and C were performed) had a color of the outermost layer in the peripheral area of the hole, and Examples 1 to 3 were pink. 4 to 5 are yellowish silver, and Examples 6 to 8 are yellow, so the types of cutting edge-exchangeable cutting tips (Examples 1 to 3 are P series (P10, P20, P30) depending on the color. ), Examples 4 to 5 could easily identify M series (M10, M30), and Examples 6 to 8 could easily identify K series (K10, K20, K30)).

  Although the embodiments and examples of the present invention have been described as described above, it is also planned from the beginning to appropriately combine the configurations of the above-described embodiments and examples.

  It should be understood that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a schematic perspective view of the blade-tip-exchangeable cutting tip of the present invention. FIG. 2 is a cross-sectional view corresponding to the cross-sectional view taken along the line II-II in FIG. It is a fragmentary sectional view which expands and shows the lamination | stacking state of the coating layer of a hole peripheral region. It is a conceptual diagram which shows the chucking method of the through-hole by a jig | tool. It is a conceptual diagram which shows the chucking method of the through-hole by a volt | bolt and a nut.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Cutting edge exchange type cutting tip, 2 Upper surface, 3 Lower surface, 4 Through-hole, 5 Hole peripheral area, 6 Outer peripheral area, 7 Side surface, 8 Edge, 10 Base material, 11 Coating layer, 20 Jig, 21 1st outermost layer, 22 2nd outermost layer, 23 lower layer, 25 convex part, 26 bolt, 27 nut.

Claims (5)

A cutting edge-exchangeable cutting tip having a base material and a coating layer formed on the base material,
The base material has a through hole reaching from the upper surface to the lower surface,
The upper surface or the lower surface includes a hole peripheral region that surrounds the periphery of the through hole with a width of 3 mm or less, and an outer peripheral region that is the other region,
The coating layer is composed of a plurality of layers,
The outermost layer of the coating layer in the hole peripheral region has a color different from that of the outermost layer of the coating layer in the outer peripheral region.   The outermost layer in the hole peripheral region is composed of at least one element selected from the group consisting of IVa group element, Va group element, VIa group element, Al, Si, and B of the periodic table, carbon, nitrogen, oxygen The blade-tip-exchangeable cutting tip according to claim 1, wherein the cutting tip is a layer formed of a compound composed of at least one element selected from the group consisting of boron and boron.   The outermost layer in the peripheral region of the hole is a layer formed of a compound composed of at least one element of Ti or Zr and at least one element selected from the group consisting of carbon, nitrogen, oxygen and boron. The blade-tip-exchangeable cutting tip according to claim 2, wherein the blade tip-exchangeable cutting tip is provided. The outermost layer in the outer peripheral region is a layer containing Al ₂ O ₃ , wherein the cutting edge-exchangeable cutting tip according to any one of claims 1 to 3 is characterized.   The hole peripheral region can identify the type of the cutting edge-replaceable cutting tip by the shape of the region or the color of the outermost layer of the region. Cutting edge exchangeable cutting tip.

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