CN116348227A - Cermet insert and cutting tool provided with same - Google Patents
Cermet insert and cutting tool provided with same Download PDFInfo
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- CN116348227A CN116348227A CN202180071021.0A CN202180071021A CN116348227A CN 116348227 A CN116348227 A CN 116348227A CN 202180071021 A CN202180071021 A CN 202180071021A CN 116348227 A CN116348227 A CN 116348227A
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- binder phase
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- layer
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
- B23B27/22—Cutting tools with chip-breaking equipment
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- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
Abstract
The metal ceramic blade (1) of the present invention comprises: the cutting edge comprises a 1 st surface (5), a 2 nd surface (7), a cutting edge (11) positioned on at least a part of the ridge lines of the 1 st surface (5) and the 2 nd surface (7), a 3 rd surface (9) positioned on the opposite side of the 1 st surface (5), and a through hole (15) from the 1 st surface (5) to the 3 rd surface (9). The inner wall (17) constituting the through hole (15) has a binder phase enrichment layer (19) having a higher binder phase content than the inside of the substrate (3) at least in the central portion. The thickness T1 of the binder phase enrichment layer (19) in the central part is thicker than the thickness T2 of the binder phase enrichment layer (19) in the end parts. The thickness T1 is 1 μm or more and 20 μm or less, and the thickness T2 is 0.2 μm or more and 6 μm or less. The 1 st surface (5) is provided with a chip breaker groove (50). The arithmetic average roughness Ra of the chip breaker groove (50) is not less than 0.1 μm and not more than 0.27 μm when the cut-off value is 0.08 mm.
Description
Technical Field
The present invention relates to a cermet insert for use in cutting machining and a cutting tool provided with the same.
Background
Currently, as a base body of a cutting tool, a wear-resistant member, a lubricating member, or the like, which requires a member having wear resistance, lubricity, or chipping resistance, a cermet mainly composed of titanium (Ti) is widely used.
For example, patent document 1 describes a cutting insert made of titanium carbonitride-based cermet having a through hole for mounting a tool body coated on the surface thereof. Patent document 1 describes providing a metal oozing layer on the inner surface of a through hole for mounting in order to provide a blade with little abnormal damage even in high-load cutting.
Prior art literature
Patent literature
Patent document 1: japanese patent application laid-open No. 2012-245581
Disclosure of Invention
The insert of the present invention is a cermet insert comprising a matrix of a cermet containing hard particles and a binder phase. The cermet blade of the present invention comprises: the surface 1, the surface 2, the cutting edge on at least a part of the ridge line of the surface 1 and the surface 2, the surface 3 on the opposite side of the surface 1, and the through hole from the surface 1 to the surface 3. The inner wall of the through hole has a binder phase enrichment layer having a higher content than the binder phase in the base body at least in the center. The thickness T1 of the binder phase enriched layer in the central portion is thicker than the thickness T2 of the binder phase enriched layer in the end portions of the inner wall. The thickness T1 is 1 μm or more and 20 μm or less, and the thickness T2 is 0.2 μm or more and 6 μm or less. In addition, the 1 st face is provided with a chip breaker. The arithmetic average roughness Ra of the chip breaker is 0.1 μm or more and 0.27 μm or less when the cut-off value is 0.08 mm.
Drawings
Fig. 1 is a perspective view showing one example of the blade of the present invention.
Fig. 2 is a schematic view in cross section showing one example of a blade of the present invention.
Fig. 3 is an enlarged schematic cross-sectional view of the blade of the present invention.
Fig. 4 is an enlarged schematic cross-sectional view of another embodiment of the blade of the present invention.
Fig. 5 is an enlarged schematic cross-sectional view of another embodiment of the blade of the present invention.
Fig. 6 is a schematic enlarged view of the VI portion shown in fig. 2.
Fig. 7 is a top view showing one example of the cutting tool of the present invention.
Fig. 8 is an enlarged schematic cross-sectional view of an insert in a cutting tool of the present invention.
Detailed Description
Blade
Hereinafter, a cermet insert (hereinafter, also referred to simply as "insert") and a cutting tool provided with the same according to the present invention will be described in detail with reference to the accompanying drawings. However, the drawings referred to below simply show the main components necessary for the description of the present embodiment for the convenience of description. Therefore, the blade of the present invention may include any constituent member not shown in the drawings to which reference is made. The dimensions of the components in the drawings do not actually show the actual dimensions, the ratio of the dimensions, and the like of the constituent components. These aspects are also the same as those of the cutting tool described later.
In a metal ceramic insert for cutting processing, little abnormal damage is required. The invention provides a cermet insert with less abnormal damage and a cutting tool with the same.
The blade of the present invention has a base body as a cermet containing hard particles and a binder phase. The hard particles are, for example, tiCN, tiC, tiN, (TiM) CN (M is one or more selected from W, nb, ta, mo, V). The main component of the binding phase is iron group metal such as Ni, co and the like. The main component means 50 mass% or more of the constituent components.
As shown in fig. 1 and 2, the blade 1 of the present invention may have a quadrangular plate shape, for example. The 1 st surface 5 as the upper surface in fig. 1 is a so-called rake surface. The insert 1 has a 2 nd surface 7 as a side surface connected to the 1 st surface 5.
The insert 1 has a 3 rd surface 9 as a lower surface located on the opposite side of the 1 st surface 5. The 2 nd surface 7 is connected to the 1 st surface 5 and the 3 rd surface 9, respectively.
The insert 1 of the present invention has a cutting edge 11 located on at least a part of the ridge line where the 1 st surface 5 and the 2 nd surface 7 intersect. In other words, the insert 1 of the present invention has the cutting edge 11 located on at least a part of the ridge line where the rake face and the relief face intersect. The cutting edge 11 may have a 4 th surface continuous with the 1 st surface 5 and the 2 nd surface 7. The 4 th surface may be a C surface (chamfer surface) cut obliquely and linearly at the corners of the 1 st surface 5 and the 2 nd surface 7. The 4 th surface may be an R surface (rounded surface) in which corners of the 1 st surface 5 and the 2 nd surface 7 are rounded.
In the insert 1, the cutting edge 11 may be formed entirely on the outer periphery of the 1 st surface 5, but the insert 1 is not limited to this configuration, and may be, for example, only one side of the quadrangular rake surface, in other words, 1 of the 4 th surfaces may have the cutting edge 11.
The insert 1 of the present invention has a through hole 15 penetrating through the base 3 from the 1 st surface 5 to the 3 rd surface 9. As shown in fig. 3, the binder phase enriched layer 19 is present in at least the central portion 17a of the inner wall 17 constituting the through hole 15. The binder phase enrichment layer 19 contains hard particles and a binder phase, and is a region having a higher content ratio than the binder phase in the matrix 3. The inside of the substrate 3 means a portion separated from the surface of the substrate 3 by 500 μm or more. The binder phase enrichment layer 19 need not be present in the entire inner wall 17 of the through hole 15, but may be located at least in the central portion 17 a.
The center portion 17a is the center when the through hole 15 is equally divided in the depth direction 9. The end 17b is an end when the through hole 15 is equally divided in the depth direction 9.
As shown in fig. 3, in the insert 1 of the present invention, the thickness T1 of the binder phase enriched layer 19 in the central portion 17a of the inner wall 17 constituting the through hole 15 is thicker than the thickness T2 of the binder phase enriched layer 19 in the end portion 17b of the inner wall 17 constituting the through hole 15. The thickness T1 of the binder phase enriched layer 19 in the central portion 17a and the thickness T2 of the binder phase enriched layer 19 in the end portion 17b are average values, respectively. The thickness T1 and the thickness T2 can be measured by observing the cross section of the blade 1 using a metal microscope and an electron microscope. Further, the binder phase enrichment layer 19 may not be present in the end portion 17 b.
The blade 1 of the present invention has such a structure, and thus, occurrence of abnormal damage to the blade 1 is suppressed by the inner wall 17 that applies a large force when the handle (not shown) is fixed.
The binder phase enriched layer 19 has a lower hardness than the base 3 and a higher hardness than the metal exudation layer as described in reference 1. Therefore, the binder phase enrichment layer 19 is suppressed in deformation compared with the metal exudation layer.
With the above configuration, when the insert 1 is fixed to the shank by the jig, the deformation suppressed by the binder phase enriched layer 19 in the central portion 17a is small in contact between the central portion 17a of the inner wall 17 and the jig, and therefore, the local force of the base 3 is small, and cracking and abnormal damage of the insert 1 are hardly generated.
The size of the blade 1 is not particularly limited, but for example, the length of one side of the rake face is set to about 3 to 20 mm. The thickness of the blade 1 is set to, for example, about 1 to 20 mm. In fig. 1, the blade 1 is shown as a quadrangle, but may be, for example, a triangle or a disk.
As shown in fig. 4, the blade 1 of the present invention may have an enlarged diameter portion 21 connected to the inner wall 17. A step is provided at the junction between the through hole 15 and the expanded diameter portion 21. In the example shown in fig. 4, the binder phase enrichment layer 19 is not present on the inner wall of the expanded diameter portion 21, but the binder phase enrichment layer 19 may be present on the expanded diameter portion 21. In the insert 1 of the present invention, the enlarged diameter portion 21 is not included in the through hole 15. The enlarged diameter portion 21 is a so-called countersink. The diameter of the expanded portion 21 is 300 μm or more larger than the diameter of the through hole 15.
The thickness T1 of the binder phase enriched layer 19 in the central portion 17a may be 1 μm or more. The thickness T1 may be 20 μm or less. According to such a configuration, abnormal damage to the blade 1 is suppressed. The thickness T1 may be 3 μm or more. The thickness T1 may be 10 μm or less.
The thickness T2 of the binder phase enriched layer 19 in the end portion 17b may be 0.2 μm or more. The thickness T2 may be 6 μm or less. According to such a configuration, abnormal damage to the blade 1 is suppressed. The thickness T2 may be 0.6 μm or more. The thickness T2 may be 4 μm or less. According to such a configuration, the local force to the base body 3 is further reduced, so that the blade 1 is less likely to break, and abnormal damage is further suppressed.
As shown in fig. 5, the diameter R1 in the central portion 17a may be larger than the diameter R2 in the end portion 17 b. With such a configuration, the contact area between the jig and the inner wall 17 increases, and the clamping force increases.
The diameter R1 in the central portion 17a may be greater than the diameter R2 in the end portion 17b by 5 μm or more and 30 μm or less. With such a configuration, abnormal damage to the blade 1 is suppressed.
The hardness of the binder phase enriched layer 19 in the central portion 17a may be 10GPa or more and 20GPa or less. According to such a configuration, the binder phase enriched layer 19 is moderately deformed when the clamp pins are in contact, and the clamp force is increased. The hardness of the binder phase enriched layer 19 in the central portion 17a may be measured by nanoindentation of the exposed binder phase enriched layer 19 in the cross section of the blade 1.
The binder phase enrichment layer 19 in the central portion 17a may have a metal layer (not shown) having a binder phase content greater than that of the binder phase enrichment layer 19 on the through axis side of the through hole 15. The metal layer is composed of only metal, and does not include a hard layer. With such a configuration, the metal layer functions as a buffer material between the jig and the binder phase enrichment layer 19, which will be described later, and thus abnormal damage to the blade 1 is suppressed. The thickness of the metal layer may be 0.3 μm or more and 2 μm or less.
The blade 1 may have a coating (not shown) on the binder phase enrichment layer 19 in the central portion 17 a. The coating being, for example, comprising TiCN, tiN, tiCNO, al 2 O 3 And the like. The coating has a portion having a higher hardness than the binder phase enrichment layer 19. With such a configuration, the abrasion resistance of the jig portion increases. The coating may be a single layer or a laminate. The coating layer may be formed by CVD or PVD.
Fig. 6 is a schematic enlarged view of the VI portion shown in fig. 2. As shown in fig. 6, the insert 1 has a chip breaker groove 50 in a 1 st surface 5 which is a rake surface. As an example, the chip breaker groove 50 is a recess that makes the 1 st surface 5 concave. The chip breaker groove 50 has an inclined surface (barrier wall 51) inclined downward from the 1 st surface 5 toward the cutting edge 11.
The chip breaker groove 50 is configured to curl the chip of the workpiece in the barrier wall 51, thereby appropriately breaking the chip or discharging the chip in a desired direction. The insert 1 having the chip breaker groove 50 can suppress biting and winding of chips. Based on this, for example, abnormal damage of the blade 1 due to the wound chips striking the base body 3 is reduced. The chip breaker 50 may have at least the barrier wall 51, and is not limited to the shape shown in the figure. For example, the chip breaker groove 50 is not necessarily required to be a concave portion, and may be stepped.
The surface roughness of the chip breaker 50 may be 0.1 μm or more in terms of arithmetic average roughness Ra when the cut-off value is 0.08 mm. If the surface roughness of the chip breaker groove 50 is small (in other words, the coefficient of friction is small), there is a problem that the chip cannot be curled properly without contacting the barrier wall 51. In contrast, when the surface roughness of the chip breaker groove 50 is set to the above range, chips are easily brought into contact with the barrier wall 51. Therefore, if the chip breaker groove 50 has a surface roughness in the above range, the chip can be curled easily. In this way, by appropriately breaking the chips, abnormal damage to the blade 1 is further suppressed.
The surface roughness of the chip breaker groove 50 may be 0.27 μm or less in terms of the arithmetic average roughness Ra when the cut-off value is 0.08 mm. If the arithmetic average roughness Ra of the chip breaker groove 50 is greater than 0.3 μm, the stress is concentrated on the barrier wall 51 due to collision of chips, and a chipping occurs in the barrier wall 51, which results in a problem that the chipping becomes large. In contrast, if the arithmetic average roughness Ra of the chip breaker 50 is 0.27 μm or less, damage to the barrier wall 51 can be less likely to occur.
The surface roughness of the cutting edge 11, in other words, the surface roughness of the 4 th surface where the cutting edge 11 is located, may be 0.2 μm or less in terms of the arithmetic average roughness Ra when the cut-off value is 0.08 mm. The insert 1 receives a large impedance when it is in contact with a workpiece (when it is cutting). The impedance at the time of cutting is a cause of breakage of the blade 1. In contrast, by setting the surface roughness of the cutting edge 11, which is the position where the cutting edge first contacts the workpiece, to the above range, the impedance at the time of cutting can be reduced. In this way, the chipping of the insert 1, specifically, the sudden chipping occurring at the time of cutting into the workpiece can be further suppressed. In addition, the cutting time until chipping occurs in the insert 1 is prolonged, and chipping resistance is improved. Further, a glossy and good finish surface was obtained as the cutting edge 11 (surface 4).
In the present embodiment, when the arithmetic average roughness Ra of the chip breaker 50 and the arithmetic average roughness Ra of the cutting edge 11 are measured, the surface shapes of the chip breaker 50 and the cutting edge 11 may be measured according to JISB0601-2013 standard, except that the cut-off value is fixed to 0.08 mm. For example, a contact surface roughness measuring machine using a stylus or a noncontact surface roughness measuring machine using a laser can be used for measurement. When the arithmetic average roughness Ra of the cutting edge 11 is measured, the surface shape along the cutting edge 11 may be measured. When the 1 st surface 5 is circular and the cutting edge 11 is circular, the surface shape may be measured on a curve along the cutting edge 11.
Method for manufacturing blade
The method for manufacturing the blade of the present invention will be described below.
The raw material powder used for manufacturing the blade of the present invention is generally a raw material powder used for manufacturing a cermet. The blade of the present invention can be obtained by improving the composition of the substrate, the firing conditions, and the processing method of the substrate.
The matrix contains, for example, tiCN 40 mass% or more and 80 mass% or less as hard particles, and Co 6 mass% or more and 30 mass% or less as a binder phase. In addition, the matrix may contain WC, taC, nbC, mo for further improving the characteristics 2 C. VC, zrC, etc.
The material having the above composition is used and formed into a shape having a space which becomes a through hole after firing. Thereafter, the mixture is fired at a temperature of, for example, 1400 ℃ to 1600 ℃. The firing atmosphere may be N 2 Under partial pressure atmosphere.
If let N 2 Partial pressure of1kPa or more, the thickness of the binder phase enriched layer after firing becomes thicker. When the average particle diameter d50 of the hard particles used as the raw material is 0.7 μm or less, a binder phase enriched layer having a metal layer with a binder phase content larger than that of the binder phase enriched layer on the through-axis (not shown) side of the through-hole can be obtained.
In addition, in the molding, if the molding pressure is high, deformation during firing can be suppressed. On the other hand, when the molding pressure is small at the time of molding, the diameter R1 in the central portion of the inner wall tends to be larger than the diameter R2 in the end portion. The relation between the molding pressure and the deformation can be adjusted in various combinations depending on the composition and the firing temperature.
For example, the rotating brush is inserted into the through hole from both end portions of the through hole after firing, and the inner wall of the through hole is polished, and the blade of the present invention can be obtained by processing the thickness T1 of the binder phase enriched layer in the central portion to be thicker than the thickness T2 of the binder phase enriched layer in the end portions. The brush may be inserted from both sides of the through hole or may be inserted from one side in two times.
Thereafter, a coating (not shown) may be provided as needed. The coating layer may be a so-called hard film, and is formed by PVD or CVD, for example. The coating may be a single layer or a laminated film.
As the coating layer, for example, tiN, tiCN, tiCNO, al can be used 2 O 3 Known materials such as TiAlN. Coatings of materials other than the examples described above may also be used.
In addition, at the time point after firing, the binder phase enrichment layer may be present in the regions other than the through holes, for example, the 1 st, 2 nd and 3 rd faces, but the binder phase enrichment layer may be removed as needed.
The surface roughness of the chip breaker can be adjusted, for example, by shot peening the surface of the substrate. Specifically, shot peening is a method of processing in which a mixture (slurry) of a solution in which ceramic abrasive grains are mixed and compressed air is collided with the surface of a substrate. Examples of the ceramic abrasive grains include alumina. The average particle diameter of the ceramic abrasive grains may be 1 μm or more and 100 μm or less. If the average particle diameter of the ceramic abrasive grains is smaller than 1 μm, it is difficult to adjust the roughness of the substrate surface. If the average particle diameter of the ceramic abrasive grains is larger than 100 μm, the surface roughness of the substrate becomes rough, which causes a problem that the surface roughness is out of the above range.
The surface roughness of the cutting edge can be adjusted, for example, by polishing only the cutting edge by a polishing method such as brushing, elastic grindstone, or shot blasting. As a polishing method, brush polishing may be performed. In this case, the amount of protrusion of the brush-polished bristles is 0.5cm or more and 5cm or less, preferably 2.5cm or more and 3.5cm or less, and a polishing liquid obtained by mixing diamond powder having an average particle diameter of 4 μm or less, preferably 0.5 μm or more and 2.5 μm or less, with a lubricating oil can be used. Based on this, the surface roughness of the chip breaker can be adjusted to a desired range, and the surface roughness of the cutting edge can be adjusted to a desired range. The chip breaker may be masked, and the surface roughness of the cutting edge may be adjusted by polishing the portion to be the cutting edge by brushing, elastic grindstone, shot blasting, or the like.
< cutting tool >
Next, a cutting tool according to the present invention will be described with reference to the drawings.
The cutting tool 101 of the present invention is, for example, a rod-like body extending from the 1 st end (upper end in fig. 7) toward the 2 nd end (lower end in fig. 7), as shown in fig. 7. As shown in fig. 7, the cutting tool 101 includes a holder 105 having a clamping groove 103 on the 1 st end side (front end side), and the insert 1 positioned in the clamping groove 103.
As shown in fig. 8, a jig 107 is inserted into the through hole 15 (see fig. 1) of the insert 1. In the example shown in fig. 8, the jig 107 is in direct or indirect contact with the binder phase enriched layer 19 (see fig. 2) located in the central portion 17 a. The indirect contact between the jig 107 and the binder phase enrichment layer 19 means that a metal layer or a coating layer is present between the binder phase enrichment layer 19 and the jig 107. The binder phase enriched layer 19 in contact with the jig 107 is more likely to deform than the base 3, and therefore it is difficult to apply locally strong force to the blade 1. Further, if the binder phase enrichment layer 19 is provided, the contact area between the jig 107 and the binder phase enrichment layer 19 is large, so that the insert 1 is difficult to move in the engagement groove during cutting. In addition to such effects, the blade 1 of the present invention is less likely to be abnormally damaged. The cutting tool 101 is provided with the insert 1, and therefore can perform stable cutting processing for a long period of time.
The clamping groove 103 is a portion to which the insert 1 is attached, and has a support surface parallel to the lower surface of the holder 105 and a restricting side surface inclined with respect to the support surface. The locking groove 103 is opened at the 1 st end side of the holder 105.
The blade 1 is located in the clamping groove 103. In this case, the lower surface of the blade 1 may directly contact the clamping groove 103, and a spacer (not shown) may be interposed between the blade 1 and the clamping groove 103.
The insert 1 is attached to the shank 105 such that at least a part of the ridge line where the rake face and the flank face intersect, which part is used as the cutting edge 11, protrudes outward from the shank 105. In the present embodiment, the insert 1 is mounted to the shank 105 by a clamp 107. In other words, the jig 107 is inserted into the through hole 15 of the insert 1, and the tip of the jig 107 is inserted into a screw hole (not shown) formed in the locking groove 103 to tighten the screw portions, whereby the insert 1 is attached to the holder 105.
As a material of the shank 105, steel, cast iron, or the like can be used. High toughness steels can be used in these components.
In the present embodiment, a so-called cutting tool 101 for turning is taken as an example. Examples of the turning include an inner diameter machining, an outer diameter machining, a grooving machining, and an end face machining. The cutting tool 101 is not limited to use for turning. For example, the insert 1 of the above embodiment may be used in a milling cutter 101.
Examples
Hereinafter, the blade of the present invention will be described.
The substrate was prepared as follows. A binder was added to a raw material powder containing TiCN 40 mass%, tiN 12 mass%, WC 20 mass%, nbC 8 mass%, co 20 mass%, and other unavoidable carbides, and then the mixture was press-molded into a desired shape, thereby producing a tool-shaped molded body having a through hole. These raw material powders are generally used for the production of cermets. The composition of the matrix of the present invention is not particularly limited. Thereafter, the binder component was removed, and then the resulting product was burned under a nitrogen atmosphere of 3kPa at a temperature of 1530 ℃ for 1 hour to obtain a blade having a binder phase enriched layer having a metal layer on the inner wall of the through hole.
Thereafter, the inner wall of the through-hole was polished by brushing to prepare a blade having the structure shown in table 1. The absence of the binder phase enrichment layer or the thin portion of the binder phase enrichment layer is due to the long polishing time of brushing.
[ Table 1 ]
(Table 1)
Among the samples of sample Nos. 1 to 23 shown in Table 1, sample Nos. 1, 2, 3, 4, 11, 12, 13, 14, 15, 19, 20, 22, 23 are comparative examples, and sample Nos. 5 to 10, 16 to 18, 21 are examples.
The 1 st, 2 nd and 3 rd surfaces of all the blades were shot-blasted to remove the binder phase enriched layer.
Polishing by brushing, applying a polishing liquid obtained by mixing diamond powder of 0.1 μm or more and 3 μm or less with a lubricating oil to a pig brush, and rotating the pig brush while aligning the through-hole and the cutting edge.
The thickness of the binder phase enriched layer at the center and the end portions, the diameter R1 at the center portion, and the diameter R2 at the end portions were measured on a cross section cut along the thickness direction of the base body on a surface including the through axis.
When the hardness of the inside of the base and the hardness of the binder phase enrichment layer are measured using the cross section of the blade, the hardness of the binder phase enrichment layer is lower than the hardness of the inside of the base.
The obtained blade is inserted into the groove of the holder, and a jig is inserted into the through hole of the blade, and the blade is fixed by the jig. Then, a cutting test was performed under the following conditions.
< cutting test >)
Cutting material: S10C
Cutting speed: 400m/min
Feed amount: 0.12mm/rev
Feed amount: 0.2mm
Cutting state: wet type
The evaluation method comprises the following steps: the chip disposability and the cutting time until chipping occurred were evaluated.
As shown in table 1, the cutting time until the occurrence of chipping was short for samples nos. 1, 2, 3, 4, 11, 12, 13, 14, 15, 19, 20, 22, 23 having the structure of the insert according to the present invention. Further, sample nos. 1, 15, 19, 20, 22, and 23 were poor in chip disposability, and winding, biting, and winding of chips occurred. The blade of the present invention is inhibited from abnormal damage. In addition, the chip is not entangled with the blade and shank. In addition, biting and winding are not generated either. In addition, the cutting time until chipping occurs becomes long, and the surface roughness of the machined workpiece is also good.
From the above results, the surface roughness Ra of the chip breaker is preferably 0.1 μm or more and 0.27 μm or less. In addition, the surface roughness Ra of the cutting edge may be 0.2 μm or less.
The metal ceramic insert and the cutting tool provided with the metal ceramic insert according to the present invention described above are examples, and may have different configurations without departing from the gist of the present invention.
Description of the reference numerals
1 blade
3 matrix
5 st side 1
7 nd surface 2
9 rd surface 3
10 th surface 4
11 cutting edge
15 through holes
17 inner wall
17a central portion
17b end
19 binder phase enrichment layer
21 expanded diameter portion
Thickness of the binder phase enriched layer of T1 in the central portion
Thickness of the binder phase enriched layer of T2 in the end portion
Diameter of R1 in the center
Diameter of R2 in the end
101 cutting tool
103 clamping groove
105 knife handle
107 clamp
Claims (8)
1. A cermet blade comprising a matrix of a cermet containing hard particles and a binder phase, the cermet blade comprising: a 1 st surface, a 2 nd surface, a cutting edge located on at least a part of the ridge of the 1 st surface and the 2 nd surface, a 3 rd surface located on the opposite side of the 1 st surface, and a through hole extending from the 1 st surface to the 3 rd surface,
the inner wall of the through hole is provided with a binder phase enrichment layer with a higher binder phase content ratio than the inside of the matrix at least in the central part,
the thickness T1 of the binder phase enrichment layer in the central portion is thicker than the thickness T2 of the binder phase enrichment layer in the end portion of the inner wall,
the thickness T1 is 1 μm or more and 20 μm or less,
the thickness T2 is 0.2 μm or more and 6 μm or less,
the 1 st face is provided with a chip breaker groove,
the arithmetic average roughness Ra of the chip breaker is 0.1 μm or more and 0.27 μm or less when the cut-off value is 0.08 mm.
2. The cermet insert according to claim 1, wherein the cutting edge has a 4 th surface continuous with the 1 st and 2 nd surfaces, and an arithmetic average roughness Ra of the 4 th surface is 0.2 μm or less at a cutoff value of 0.08 mm.
3. A cermet blade according to claim 1 or 2, wherein the diameter R1 in the central portion is larger than the diameter R2 in the end portions.
4. A cermet blade according to claim 3, wherein the diameter R1 is greater than the diameter R2 by 5 μm or more and 30 μm or less.
5. The cermet insert according to any one of claims 1 to 4, wherein the binder phase enriched layer in the central portion has a hardness of 10GPa or more and 20GPa or less.
6. The cermet insert according to any one of claims 1 to 5, wherein the binder phase enriched layer in the central portion has a metal layer having a larger binder phase content than the binder phase enriched layer on a through axis side of the through hole.
7. The cermet blade of any of claims 1-6 wherein a coating having a portion of higher hardness than the binder phase enriched layer is provided over the binder phase enriched layer in the central portion.
8. A cutting tool, having: a shank having a length extending from a 1 st end to a 2 nd end and having a clamping groove located on the 1 st end side;
a cermet insert according to any of claims 1-7 in said clamping groove; and
and a jig inserted into the through hole of the metal ceramic blade.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2020176779 | 2020-10-21 | ||
| JP2020-176779 | 2020-10-21 | ||
| PCT/JP2021/038495 WO2022085647A1 (en) | 2020-10-21 | 2021-10-18 | Cermet insert and cutting tool equipped therewith |
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| Publication Number | Publication Date |
|---|---|
| CN116348227A true CN116348227A (en) | 2023-06-27 |
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| CN202180071021.0A Pending CN116348227A (en) | 2020-10-21 | 2021-10-18 | Cermet insert and cutting tool provided with same |
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| JP (1) | JP7483917B2 (en) |
| CN (1) | CN116348227A (en) |
| WO (1) | WO2022085647A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02131803A (en) * | 1988-11-11 | 1990-05-21 | Mitsubishi Metal Corp | Cutting tool made of abrasion resistant cermet excelling in chipping resistance |
| SE9101590D0 (en) * | 1991-05-24 | 1991-05-24 | Sandvik Ab | SINTRAD CARBON Nitride Alloy with Binder Phase Enrichment |
| SE514283C2 (en) * | 1995-04-12 | 2001-02-05 | Sandvik Ab | Coated carbide inserts with binder facade-enriched surface zone and methods for its manufacture |
| JP2012245581A (en) * | 2011-05-26 | 2012-12-13 | Mitsubishi Materials Corp | Cutting insert made from surface coated titanium carbon nitride-based cermet, and method for manufacturing the same |
| US11027338B2 (en) * | 2015-05-28 | 2021-06-08 | Kyocera Corporation | Cutting insert, cutting tool, and method for manufacturing machined product |
| JP7128351B2 (en) | 2019-04-22 | 2022-08-30 | 京セラ株式会社 | Insert and cutting tool with same |
-
2021
- 2021-10-18 JP JP2022557538A patent/JP7483917B2/en active Active
- 2021-10-18 CN CN202180071021.0A patent/CN116348227A/en active Pending
- 2021-10-18 WO PCT/JP2021/038495 patent/WO2022085647A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| JPWO2022085647A1 (en) | 2022-04-28 |
| JP7483917B2 (en) | 2024-05-15 |
| WO2022085647A1 (en) | 2022-04-28 |
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