JPS5837172A - Coated tool parts - Google Patents

Abstract

PURPOSE:To obtain coated tool parts having excellent abrasion resistance, plastic deformation resistance and chipping resistance by coating the base body of a super hard alloy formed with surface layers fitting to coating layers with outer layers of a hard phase and inner layers contg. metallic sulfide and having lubricity. CONSTITUTION:The content of a binding phase consisting of metals is increased in the surface layers of the base body from the surface of the base body consisting of a super hard alloy or cermet down to 2-40mum depth toward the inside part of the base body as compared to the inside part of the base body, whereby the toughness of the resultant parts is improved. Thereafter, the composite layers consisting of the hard phase consistig >=1 kind among carbide, nitride, boride, carbonitride, oxycarbide, oxynitride, carbonitride and boronitride of group 4a, 5a, and 6a metals, aluminum oxide and aluminum oxynitride and sulfide of metals are formed as the inner coating layers on the surface of the tool parts and the outermost coating layers consisting of the above-mentioned hard layers which are high hard layers are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coated tool part that is excellent in wear resistance, grease resistance, deformation resistance, and chipping resistance and is particularly suitable for cutting tools and wear-resistant tools.

Conventionally, it has been carried out to extend the service life of a tool part O consisting of a cemented carbide layer and cermet and coat it with a wear-resistant material o1 [K41110] consisting of a cemented carbide and a cermet. Coated tool parts, in which the surface of the base body is coated with wear-resistant material, have superior wear resistance compared to tool parts that consist only of the base body. PV-P is a method for forming a coating layer that is millier than that of the base material.
(physical vapor deposition method) or OV'D (chemical vapor deposition method), it is necessary to raise the temperature69, and during the cooling process, the coating layer is Tensile stress may be applied to the material, causing scratches. %, when a coating layer is formed on the surface of a substrate by the QVDI process, since the coating layer is formed at a high temperature, the rate of heat generation in the coating layer is also high, and even if the thickness adjusted during the cooling process is When a coated tool part 19j with a fragile coating layer is used as a cutting tool, cutting stress is applied to the tip of the coated tool part.
There is a problem in that two cracks occur in the coating layer, and these cracks propagate inside the base body, leading to damage to the tool parts.

The ninth type of kO has been proposed to improve the wear resistance, plastic deformation resistance, and chipping resistance of coated tool parts, and the present inventors have also added a highly wear-resistant material to the coating layer of coated tool parts. We propose coated tool parts with improved wear resistance, plastic deformation resistance, and chipping resistance (by optimally combining the properties of hard materials and lubricity materials). However, tests have shown that the coating layers of these coated tool parts also have different wear resistance, layer resistance, deformation resistance, and fracture resistance depending on the relationship with the structure of the substrate surface layer of the cemented carbide and cermet that are coated. t
- It was found by returning mb.

The present invention solves the problems with conventional coated tool parts as described above.

That is, the present invention provides the optimum combination of the coating layer of a coated tool component depending on the characteristics of each of the high hardness material and the lubricating material, and furthermore, the surface layer of the substrate made of cemented carbide and cermet to be coated with the coating layer. As a result, the coated tool part has improved wear resistance, plastic deformation resistance, and chipping resistance due to the combined strength of the coating layer and the base surface layer.

In the coated tool part of the present invention, the base surface layer from the base OII box made of cemented carbide or cermet to a depth of 2 to 40 μm inward has a binder phase content made of metal f compared to the inside of the base. A tool part, this tool part e
) IIW/fJK coating inner layer: carbide, nitride, bridged product, carbonitride, oxycarbide of group 4a, 5a and 6a metals,
After coating a composite phase consisting of a metal sulfide and a hard phase consisting of one or more selected from oxynitride, carbonoboride, nitride boride, aluminum oxide and aluminum oxynitride, this composite This is a coated tool part in which the hard phase is coated on the surface of the phase as an outer coating layer.

Such coated tool parts of the present invention can be used as cutting tools.
When using a coated tool, the outer coating layer, which is the outermost layer of the coated tool part, is a hard phase made of a high-hardness material, so it has excellent resistance to scratch-like wear (abrasive wear) caused by chips generated during cutting. The high hardness material of the outer layer of the coating contributes to the wear resistance against crater wear on the rake face of tool parts at the initial wear stage, and as the crater wear progresses, the inner layer of the coating contributes to the wear resistance. Metal sulfide, which is a lubricating material contained in the composite phase of the process, appears little by little on the crater surface and acts as a lubricant on the contact surface between the chips and the tool parts.
Together with the outer coating layer, it contributes to wear resistance. In addition, wear resistance is improved due to the lubricating effect of sulfide, and the plastic deformation resistance of the base material is also improved because temperature increases are less likely to occur on the surfaces of tool parts and the surfaces of tool parts that come into contact with bamboo chips. effective. Regarding the metal sulfides used in ζ\, group 6a metal sulfides are superior when focusing on lubricity, but when considering adhesion and wettability with the hard phase of the substrate and outer coating layer, In particular, a metal sulfide consisting of an element contained in the hard phase and the substrate is suitable, and a titanium sulfide is optimal if the hard phase and the substrate contain a titanium compound.

The reason why the inner coating layer of the coated tool part of the present invention is made of a composite phase is because
This is because it has an effect on the strength of the inner coating layer itself and on the adhesion and wettability between the substrate and the inner coating layer.

The composite phase used here has a structure in which a hard phase is coated parallel to the surface of the substrate, and then a sulfide phase of metal is coated on the surface of the ζ0* hard phase, and a high hardness material is coated on the surface of the substrate. There is a structure in which a mixed phase of metal sulfide is coated, and a structure in which the former and the latter Oa are combined, that is, after a hard phase is coated parallel to the substrate surface, this hard phase O surface mK high rigidity material and metal Oa are coated.
There is a structure that covers a mapped phase with sulfide.

In the base of the coated tool part of the present invention, the base surface layer from the base surface to a depth of 2 to 40 μm toward the inside of the base has a higher content of a binder phase made of metal than the inside of the base.
Therefore, when a crack occurs in the fragile coating layer consisting of the inner layer and the outer coating layer, it is effective to prevent the crack from propagating and progressing inside the base, and this improves the toughness of the coated tool part. It has excellent fracture resistance.

When the coating layer of the coated tool part of the present invention contains a lubricating material, the temperature rise at the part where the chips and the tool part come into contact is small, and this is effective in improving the plastic deformation resistance of the base.
When the cutting conditions are such that the heat rises even higher, such as ll & half-cut cutting and flat-feed cutting, plastic deformation occurs at the tip of the base.

In order to prevent plastic deformation of the substrate, it is necessary to minimize the softening of the substrate at high temperatures. In order to prevent the substrate from softening at high temperatures, the Fe%Ni contained in the substrate,
(!O.

Possible methods include reducing the content of the metal binder phase consisting of MO, Or, and V, or increasing the content of carbides or nitrides of group 4a and 5a metals in the substrate.

However, there are also methods to reduce the binder phase content of the substrate.
A method of increasing the carbide or nitride content of group 1 and 5a metals also promotes embrittlement of the entire substrate, leading to defects in the substrate. Therefore, it is necessary to increase the amount of the binder phase only in the surface layer of the substrate, like the substrate in the coated tool parts of the present invention.
Therefore, the coated tool parts have excellent toughness and are useful for improving tool life.Furthermore, when the coated tool parts are precipitated on the hard phase, which is a high hardness material, in the base surface layer with a large amount of binder phase, it not only has toughness but also has even better weight resistance and deformability. It becomes a coated tool part with

In the base of coated tool parts of unexploded &A, if the depth of the base surface layer is less than 2μm, the effect on toughness is weak (40g
If the depth exceeds m1, plastic deformation occurs and the life of the tool parts is shortened, so the base surface layer #i was set to 2 to 40 μm.

The method for manufacturing the white substrate surface layer of a coated tool component of the present invention includes spraying the substrate surface layer components in powder form onto a press-molded product.
It can be formed by a method of sintering, a method of gradually cooling a press-formed product after sintering, a method of adjusting the treatment atmosphere, treatment temperature, and treatment time in the coating step, etc.

゛ Furthermore, the formation of the backing layer can be achieved by applying a powder by chemical vapor deposition (CVD), physical vapor deposition (PVD), ion blasting, sputtering, or various spraying methods, and then baking at an elevated temperature. .

Next, the coated tool part of the present invention will be described in detail according to examples.

Example 1 The final component composition in the cermet base is TiC-15
1T 1N-15*WO-1551+Ta O-10l
MotC! -7,5-1l-7-51(!o (M
After blending commercially available raw material powder bundles and adjusting the mixed powder wood pipes according to the usual manufacturing method, (a) Step of press-forming into BMP 432 type indexable chips by baking clay.

(b) via-5+GTxy-5IsTo-5%T
aC-5% MogO-15% 11-15 ti (I (weight 9
G) A step of spraying the mixed and adjusted powder.

(C) A step of holding the sintered body at 1400° C. for 1 hour in a vacuum and removing a thin layer of the burnt surface of the sintered body by polishing.

(d) Set the nine samples obtained in (0) in the reaction container, and
Chi T1ct4-30%am+-65SHz -3,x,
A step of applying titanium carbide approximately 5 μm thick to the sample surface in an atmosphere at 1000° C. for 5 hours.

(e) 4s%htats-xoscoz-says
A step of applying alonium oxynitride to a sample surface with a thickness of about 2 μm at 1000° C. for 3 hours in a -go, s% az gas atmosphere.

(f) 5chi Tioj4-49-MN-45%Hz-10
- Approximately 1 after processing at 1000℃ for 20 minutes in Hss gas atmosphere
A process in which titanium nitride and sulfide with a thickness of μm are applied to the sample surface.

(r) 5*Tzcz4-45%Nz-5a%H21
j, x, about 0.
Step of applying titanium nitride with a thickness of 5 μm to the sample surface.

From each of the above steps (,) -(b) -(,) -(d
) -(e) -(f) Covered tool part iA of the present invention manufactured through the steps of -(f), (a) -(b)
- (0) - (, ri - (,) as a comparative coated tool part tB manufactured through the process of (a) - (e) - (b)) - (-) for comparison Covered tool part t-C. Table 1 shows the shape 11 of the base surface layer and coating layer of the coated tool parts of M, B, and O, and the following cutting conditions were used to compare the performance and ability of the coated tool parts of M, B, and Cj. Conduct a cutting test using
Shown in the table.

Wear resistance and plastic deformation resistance test in turning Work material 548c (un 245-253) Cutting speed 150 m/win Cutting depth 1.5 m Feed speed 0.5 m/r@17 Cutting time 30 min Turning Fracture resistance test material 84806 equally spaced slots Cutting speed 100 m/win Depth of cut 1.5 as Feed 1) M degree 0.15 m/ray From the results in Table 2, the applied tool of the present invention It was confirmed that the product G was superior to the comparative coated tool parts B and O in terms of surface wear resistance, crater wear resistance, plastic deformation resistance, and chipping resistance.

Example 2 J Engineering S 5) iP432 made of cemented carbide equivalent to K20
Using a substrate of the shape (a), chemically plate a CO metal layer with a thickness of about 5 μm on the substrate surface, and heat this in a vacuum atmosphere at 1350°C for about 5 minutes to diffuse the surface CO into the substrate and surface layer. process.

(b) 2s*'ricj4-501H! -25Is
Furnace pressure f in OH + gas atmosphere 60taHF 4Cl
, and holding at 1050°C for 15 minutes.

(c) 4%T1ata-7HGag-25chiCTl
4 The pressure inside the furnace of gas atmosphere H is set to 200 Hf and 10
A process of holding at 50°C for 180 minutes to apply a titanium carbide waxed layer with a thickness of about 7 μm.

(a) 5%TLCta-40%N2-45chiH1-
10' Step of applying titanium nitride and sulfide to a sample surface with a thickness of 1111 μm by processing at 1000° C. for 20 minutes in a JH2S gas atmosphere.

(e) 5) TLOLa-454s141-5091
H! Approximately 0.
Sample #! 5 μm thick titanium nitride! The process of adding it to the box.

From each of the above steps ←) −(b) −(Q) −(d)
- The coated tool part of the present invention manufactured through the steps (,) is designated as D, and the coated tool part X of the present invention manufactured through the steps (a)-(C)-(~-(e)) is designated as D. ,(,)-(C
) −(,) to produce the coated tool parts for comparison? Let G be a comparative coated tool S& manufactured through steps (0)-(e). These D% E1 A, G
Shape of base surface layer and coating layer of O11 covered tool parts! # is shown in Table 3, and according to the cutting conditions used in Example 1 to compare the performance of the coated tool parts DllC, F, (), the stress resistance was determined by surface wear resistance, crater wear resistance, and plasticity resistance. All cutting tests for deformability and fracture resistance were conducted, and the results are shown in Table 4.

From the results in Table 4, the coated tool parts of the present invention, K, have better flank wear resistance than the comparative coated tool parts F and G.
It has excellent crater wear resistance and chipping resistance, and is also superior to comparative tool part F, which has a base surface layer, in terms of plastic deformation resistance. Further, D, which has a hard phase precipitated on the surface layer of the white substrate of the coated tool component of the present invention, has improved wear resistance and plastic deformation resistance without particularly reducing chipping resistance.

Claims (5)

[Claims] (1) A tool part in which the surface layer of the base from the surface of the base made of cemented carbide or cermet to a depth of 2 to 40 ttrn toward the inside of the base has a higher content of the binder phase made of metal than the inside of the base. , 4a, 5a and 6a group metal carbides, nitrides, etc. as coating inner layers on the surface of tool parts,
A hard phase consisting of L type or two or more selected from borides, nitrides, carbides, oxynitrides, carbonborides, boron nitrides, aluminum oxides and aluminum oxynitrides, and a metal sulfide. A coated tool part characterized in that a composite phase consisting of the following is present, and the hard phase is present as an outer coating layer. (2) The coated tool component according to claim 1, wherein the base surface layer contains the hard phase component in the coating layer. (3) The base surface layer is Oi! in the coating layer! The coated tool part according to claim @11j11111, characterized in that it consists of a qualitative phase component and a bonded phase component. (4) The coated tool parts according to claims 1, 2, and 3, wherein the metal sulfide is a sulfide of a group 4a, 5a, or 6a metal. (5) Claims 1, 2, and 3 characterized in that the metal sulfide is a titanium sulfide.
Coated tool parts as described in section.