WO2019107313A1

WO2019107313A1 - Iron-based powder mixture and method for manufacturing iron-based sintered member

Info

Publication number: WO2019107313A1
Application number: PCT/JP2018/043422
Authority: WO
Inventors: 祐司山西; 昌史高橋
Original assignee: 日立化成株式会社
Priority date: 2017-12-01
Filing date: 2018-11-26
Publication date: 2019-06-06
Also published as: JP6969330B2; JP2019099867A

Abstract

An embodiment of the present invention relates to an iron-based powder mixture containing a main raw material powder including at least one type of powder selected from the group consisting of an iron powder and an iron alloy powder, a secondary raw material powder, and a powder of a calcium salt of a higher fatty acid.

Description

Iron-based powder mixture and method for producing iron-based sintered member

Embodiments of the present invention relate to a method of manufacturing an iron-based powder mixture and an iron-based sintered member.

Iron-based sintered members produced by powder metallurgy are applied to various applications because they have special metallographic structures which can not be obtained by the melting method.

The iron-based sintered member is manufactured, for example, by press-forming and sintering a mixture containing iron powder, powder for an alloy such as copper powder, nickel powder, etc., graphite powder, a forming lubricant and the like. . In recent years, in order to meet requirements such as a complicated part shape and strict dimensional tolerances, a sintered body may be subjected to cutting after sintering. In order to enable the sintered body to be machined smoothly, techniques for imparting good machinability to the sintered body have been studied.

As a measure for improving the machinability of a sintered body, a method is known in which manganese sulfide (MnS) is contained in the sintered body. The machinability improvement effect brought about by manganese sulfide is believed to be due to the fact that manganese sulfide promotes chip division. In this method, an iron-based powder mixture to which manganese sulfide powder is added as a raw material is used to obtain a sintered body.

As another method, there is known a method of enhancing the machinability of a sintered body by adding a composite oxide such as ghalenite (see, for example, Patent Document 1). In Patent Document 1, a CaO-Al ₂ O ₃ -SiO ₂ -based composite oxide mainly composed of iron powder in an iron-based mixed powder for powder metallurgy and having an anorsite phase and / or a galenite phase and having an average particle size of 50 μm or less An iron-based mixed powder for powder metallurgy characterized by containing 0.02 to 0.3% by mass of the powder of In Patent Document 1, it is considered that a protective film of CaO-Al ₂ O ₃ -SiO ₂ -based composite oxide is formed on the surface of a tool at the time of cutting, in the anorthite phase and / or the galenite phase, and the machinability is improved. There is.

Japanese Patent Laid-Open No. 9-279204

An embodiment of the present invention aims to provide an iron-based powder mixture from which a sintered body with high machinability can be obtained. Another object of the present invention is to provide a manufacturing method capable of efficiently manufacturing an iron-based sintered member.

The invention includes various embodiments. Examples of embodiments are listed below. The present invention is not limited to the following embodiments.

One embodiment relates to an iron-based powder mixture containing a main raw material powder containing at least one selected from the group consisting of iron powder and iron alloy powder, an auxiliary raw material powder, and a calcium salt powder of a higher fatty acid.

According to a preferred embodiment, the calcium salt powder of higher fatty acids comprises calcium behenate powder.

According to a preferred embodiment, the content of the calcium salt powder of the higher fatty acid is 0.1 to 1.2% by mass with respect to the total mass of the main raw material powder.

In another embodiment, the iron-based powder mixture according to any one of the above is molded to obtain a molded body, the sintered body is sintered to obtain a sintered body, and the sintered body is cut. The present invention relates to a method of manufacturing an iron-based sintered member having a cutting process step of processing.

In another embodiment, the iron-based powder mixture according to any one of the above is molded to obtain a molded body, the molded body is sintered to obtain a sintered body, the sintered body is heat-treated, The present invention relates to a method for producing an iron-based sintered member, including a heat treatment step of obtaining a heat treatment body, and a cutting step of cutting the heat treatment body.

In another embodiment, any iron-based powder mixture is molded to obtain a molded body, the molded body is sintered to obtain a sintered body, the sintered body is subjected to steam treatment The present invention relates to a method for producing an iron-based sintered member, comprising: a steam treatment step of obtaining a steam treated body; and a cutting step of cutting the steam treated body.

According to a preferred embodiment, in the cutting step, cutting is performed using a cutting tool containing at least titanium on the surface.

According to an embodiment of the present invention, it is possible to provide an iron-based powder mixture capable of obtaining a sintered body with high machinability. Further, according to another embodiment of the present invention, it is possible to provide a manufacturing method capable of efficiently manufacturing an iron-based sintered member.

FIG. 1 is a schematic view showing a lathe machining process carried out in Example 2. FIG. 2 is a schematic perspective view showing a cutting tool used in Example 2. FIG. 3 is a digital microscope photograph showing a portion of the cutting tool used in Example 2. FIG. 4 is a graph showing the evaluation results of the machinability of the sintered bodies in Example 2 and Comparative Example 2. FIG. 5 is an electron micrograph showing a portion of the cutting tool used in Example 2 and Comparative Example 2.

Embodiments of the present invention will be described. The present invention is not limited to the following embodiments.
<Iron-based powder mixture>
According to one embodiment, the iron-based powder mixture comprises at least a main raw material powder comprising at least one selected from the group consisting of iron powder and iron alloy powder, an auxiliary raw material powder, and a calcium salt powder of a higher fatty acid. contains.

(Primary raw material powder)
The main raw material powder contains at least one selected from the group consisting of iron (Fe) powder and iron alloy powder. As elements contained in the iron alloy, copper (Cu), nickel (Ni), chromium (Cr), molybdenum (Mo), vanadium (V), manganese (Mn), titanium (Ti), aluminum (Al), carbon ( C) etc.

As the main raw material powder, specifically, a known iron-based sintered material can be used. For example, one type of SMF (pure iron type), two types of SMF (iron-copper type), three types of SMF (iron-carbon type), four types of SMF (iron-copper-carbon type) defined in Z2550 of Japanese Industrial Standard (JIS) ), 5 types of SMF (iron-nickel-copper-carbon type), 6 types of SMF (iron-copper-carbon type), 7 types of SMF (iron-nickel type), 8 types of SMF (iron-nickel-carbon type), 1 type of SMS (austenite) Stainless steel), SMS 2 type (ferritic stainless steel) and the like; 4100 type (iron-nickel-molybdenum type) of the American Iron and Steel Institute standard (AISI), 4600 type (iron-chromium-manganese type) and the like. The main raw material powder may be used alone or in combination of two or more.

(Additive material powder)
The auxiliary material powder is powder other than iron powder, iron alloy powder, and calcium salt powder of higher fatty acid, and examples thereof include metal powder, metal alloy powder, carbon (C) powder, lubricant powder and the like. It is possible to modify, strengthen, etc. the sintered body by the auxiliary raw material powder. The auxiliary raw material powder can be appropriately selected and used according to the desired characteristics of the sintered body.

As an element contained in metal powder and metal alloy powder, for example, copper (Cu), nickel (Ni), molybdenum (Mo), chromium (Cr), vanadium (V), manganese (Mn), titanium (Ti), aluminum Metal elements other than iron (Fe) such as (Al) may be mentioned. Specifically, copper powder, copper alloy powder, nickel powder, nickel alloy powder, tungsten powder, molybdenum powder and the like can be mentioned. Examples of the carbon powder include graphite powder, carbon black, fullerene and the like. Examples of the lubricant powder include fatty acids, fatty acid amides, fatty acid salts, fatty acid alcohols and the like. Specific examples thereof include stearic acid, stearic acid amide, zinc stearate, lithium stearate and the like. The auxiliary raw material powder may be used singly or in combination of two or more.

(Calcium salt powder of higher fatty acid)
The calcium salt powder of higher fatty acid can improve the machinability of the sintered body. When a sintered body prepared using a raw material powder containing calcium salt powder of higher fatty acid is cut by a cutting tool, a deposit containing calcium adheres to the surface of the cutting tool, and the presence of the deposit improves the life of the cutting tool It is thought that. The formation of the calcium-containing deposit on the surface of the cutting tool can be confirmed by surface observation with a scanning electron microscope (SEM) and elemental analysis with an electron probe microanalyzer (EPMA).

In a sintered body prepared using a raw material powder containing a calcium salt powder of higher fatty acid, it is speculated that calcium is concentrated and present at the interface between the crystal grains derived from the raw material powder and the auxiliary raw material powder and the pores. Ru. The presence of concentrated calcium at the interface between the crystal grains and the pores can be confirmed, for example, by analyzing the surface in contact with the pores of the crystal grains with an electron probe microanalyzer (EPMA).

The calcium salt powder of higher fatty acids also has an effect as a lubricant, so the friction between the molded body and the mold when the molded body is pulled out from the mold is reduced, and the occurrence of defects such as galling and chipping is suppressed. be able to. In addition, since the powder is not a hard powder such as CaO-Al ₂ O ₃ -SiO ₂ -based composite oxide, it is possible to maintain sufficient density of the compact. Furthermore, calcium salt powder of higher fatty acid has sufficient mechanical strength without inhibiting diffusion bonding of iron powder and iron alloy powder during sintering because higher fatty acid is decomposed and removed when heated. The sintered body which has these is obtained. In addition, calcium salt powder of higher fatty acids is inexpensive, and can suppress wear of cutting tools without significantly increasing the manufacturing cost by use, so the iron-based sintering is efficient and economical as a whole. A member can be provided.

The carbon number of the higher fatty acid is preferably 12 or more, more preferably 15 or more, and still more preferably 18 or more, from the viewpoint of obtaining a sufficient effect as a lubricant. The carbon number of the higher fatty acid is preferably 28 or less, more preferably 26 or less, and still more preferably 24 or less, from the viewpoint of improving the machinability and obtaining a high density of the shaped body. The higher fatty acid may be a saturated fatty acid or an unsaturated fatty acid, preferably a saturated fatty acid.

Specific examples of higher fatty acids include stearic acid, ricinoleic acid, behenic acid, montanic acid, lauric acid, palmitic acid and the like, with preference given to behenic acid. The calcium salt powder of higher fatty acid may be used alone or in combination of two or more.

(composition)
The content of the auxiliary material powder in the iron-based powder mixture may be set according to the application of the iron-based sintered member, for example, 0.5 mass% or more based on the total mass of the main material powder Preferably it is 1.0 mass% or more, More preferably, it is 1.5 mass% or more. The content of the auxiliary material powder in the iron-based powder mixture is preferably 4.0% by mass or less, more preferably 3.5% by mass or less, based on the total mass of the main raw material powder, and still more preferably It is 3.0 mass% or less.

The content of the calcium salt powder of higher fatty acid in the iron-based powder mixture is preferably 0.1% by mass or more, based on the total mass of the main raw material powder, from the viewpoint of improving machinability and lubricity. Preferably it is 0.2 mass% or more, More preferably, it is 0.3 mass% or more. The content of the calcium salt powder of higher fatty acid in the iron-based powder mixture is preferably 1.2% by mass or less, more preferably 1.0% by mass or less, from the viewpoint of improving the density of the molded body and the sintered body More preferably, it is 0.9 mass% or less.

According to one embodiment, the iron-based powder mixture does not contain a higher fatty acid and a compound containing the same, other than the calcium salt of a higher fatty acid, from the viewpoint of improving the density of the formed body and the machinability of the sintered body. Is preferable, and it is more preferable not to contain an organic compound. Examples of compounds containing higher fatty acids include salts of higher fatty acids, esters of higher fatty acids, and amides of higher fatty acids. For example, zinc stearate, which is known as a lubricant, tends to lead to a reduction in the density of the molded body by containing it. In addition, since zinc is easily vaporized by heating at the time of firing, zinc does not remain in the sintered body after sintering. Therefore, zinc stearate can not obtain the effect of machinability improvement.

According to a preferred embodiment, the iron-based powder mixture is a mixture comprising a main raw material powder, an auxiliary raw material powder, a calcium salt powder of a higher fatty acid, and an unavoidable impurity, and according to a more preferred embodiment, an iron-based powder mixture The powder mixture is a mixture of at least one selected from the group consisting of iron powder and iron alloy powder, auxiliary material powder, calcium salt powder of higher fatty acid, and inevitable impurities. The content of unavoidable impurities is, for example, 0.1 mass% or less, preferably 0.05 mass% or less, more preferably 0.03 mass% or less, based on the total mass of the iron-based powder mixture. is there. The auxiliary material powder preferably contains at least one selected from the group consisting of metal powders other than iron-based powders, metal alloy powders other than iron alloy powders, carbon (C) powders, and lubricant powders, for example, It consists of at least 1 sort (s) selected from the group which consists of metal powder other than iron-type powder, metal alloy powder other than iron alloy powder, and carbon powder.

Further, according to one embodiment, from the viewpoint of improving the density of the molded body and the machinability of the sintered body, the iron-based powder mixture comprises the main raw material powder, the metal powder, the metal alloy powder, and carbon (C) It is a mixture comprising an auxiliary raw material powder selected from the group consisting of powders, a calcium salt powder of a higher fatty acid, and an unavoidable impurity. The content of unavoidable impurities is, for example, 0.1 mass% or less, preferably 0.05 mass% or less, more preferably 0.03 mass% or less, based on the total mass of the iron-based powder mixture. is there. The auxiliary material powder may contain one powder selected from the group consisting of metal powder, metal alloy powder, and carbon powder, or may contain two or more powders.

Specific examples of the iron-based powder mixture include iron powder, 1.0 to 2.0% by mass copper powder, 0.5 to 1.5% by mass graphite powder, 0.2 to 1.0% by mass behenic acid There may be mentioned calcium powder and a mixture consisting of 0.1% by mass or less of unavoidable impurities. The content of the unavoidable impurities is a ratio (mass%) to the total mass of the iron-based powder mixture, and the content of the other components is a ratio (mass%) to the mass of the iron powder.

<Method of manufacturing iron-based sintered member>
According to one embodiment, the method of manufacturing an iron-based sintered member comprises: forming the above-mentioned iron-based powder mixture to obtain a compact; sintering the compact; and obtaining a sintered body And cutting the sintered body to obtain an iron-based sintered member. The method for producing an iron-based sintered member may further include optional steps such as a degreasing step, a heat treatment step, and a steam treatment step.

As a manufacturing method which further has an arbitrary process, the following manufacturing methods are mentioned, for example.
According to one embodiment, the method of manufacturing an iron-based sintered member comprises: forming the above-mentioned iron-based powder mixture to obtain a compact; sintering the compact; and obtaining a sintered body And heat-treating the sintered body to obtain a heat-treated body, and a cutting step of cutting the heat-treated body.
According to one embodiment, the method of manufacturing an iron-based sintered member comprises: forming the above-mentioned iron-based powder mixture to obtain a compact; sintering the compact; and obtaining a sintered body And a steaming step of steaming the sintered body to obtain a steamed body, and a cutting step of cutting the steamed body.

The heat-treated body is a sintered body to which at least heat treatment has been applied, and the steam-treated body is a sintered body to which at least steam treatment has been applied. That is, examples of the sintered body include a sintered body not subjected to heat treatment and steam treatment; a heat treated body; a steam treated body and the like.

(Molding process)
In the molding step, the iron-based powder mixture is filled in a desired mold and compression molded to obtain a molded body (green compact). There is no particular limitation on the molding method, and the method of wizdrowal, floating die, etc. can be applied. At the time of molding, a lubricant may be applied to the mold and mold lubrication molding may be performed. During molding, the iron-based powder mixture and the mold may be heated to perform warm molding. The heating temperature is, for example, 100 to 140.degree. The molding pressure is optional, for example, 500 to 900 MPa.

(Sintering process)
In the sintering step, the compact is sintered in a sintering furnace under a predetermined atmosphere and temperature. The sintering conditions can be appropriately set according to the iron-based powder mixture. The sintering temperature is, for example, 1,000 to 1,400 ° C. The sintering temperature is preferably 1,100 or more from the viewpoint of sufficiently advancing the sintering. On the other hand, the sintering temperature is preferably 1,300 ° C. or less, more preferably 1,200 ° C. or less, from the viewpoint of obtaining calcium sufficiently in the sintered body and obtaining a sufficient effect of improving the machinability. . For example, the sintering time is 5 to 150 minutes. Sintering is usually preferably carried out in a non-oxidizing atmosphere such as nitrogen gas.

(Heat treatment process)
In the heat treatment step, heat is applied to the sintered body to impart desired properties to the sintered body according to the application. By heat treatment, for example, properties such as strength, hardness, tenacity, and impact resistance can be improved. The heat treatment includes quenching, tempering, annealing, normalizing and the like. For example, the heat treatment is performed by heating in the range of 600 to 900 ° C. and then cooling by, for example, standing to cool. After this, the material may be quenched by heating at the austenite region temperature of the iron-based material, and may be further tempered.

The gas atmosphere for the heat treatment may be the air, but a gas atmosphere in which the sintered body is difficult to oxidize is preferable. For example, non-oxidizing gas such as nitrogen gas, reducing gas such as decomposition ammonia gas, carburizing gas (for example, a mixture of hydrogen, nitrogen and carbon monoxide in the range of 0.1 to 1.2% carbon potential) Gas, etc. can be selected.

(Steam treatment process)
In the steam treatment step, the sintered body is exposed to steam. The water vapor is preferably at a high temperature, for example 370-580 ° C. As a method of steam treatment, a method of injecting steam to a sintered body is mentioned. The water vapor penetrates from the surface layer of the sintered body to the pores inside, and an iron oxide (Fe ₃ O ₄ ) phase is formed in the surface layer of the sintered body and the interface between the iron base and the pores. By the iron oxide phase, the pores can be rounded to reduce notch sensitivity and improve fatigue strength. A mesh belt furnace, a pot furnace capable of maintaining high pressure, or the like can be used to inject water vapor. A pot furnace is preferred in that the iron oxide phase can be formed to a deep portion.

(Cutting process)
In the cutting process, the sintered body (sintered body not subjected to heat treatment and steam treatment; heat treated body; steam treated body etc.) is cut into a desired shape. The cutting may be turning, milling, or both. As a turning process, a lathe process etc. are mentioned, As a milling process, a milling process, a drilling process, etc. are mentioned. The cutting tool may be a single-edged tool or a multi-edged tool. Examples of cutting tools include cutting tools, milling cutters, end mills, drills, reamers and the like. A machining center may be used when performing many types of processing.

Materials for the cutting tool include cermet, ceramics, cemented carbide, high-speed tool steel, diamond sintered body, cBN sintered body and the like. The cutting tool may be a tool having a coating layer on the surface. As the coating layer, a layer containing titanium nitride, titanium carbide, aluminum oxide or the like can be mentioned.

It is preferable to use a tool containing titanium at least on the surface, in view of exhibiting particularly good durability when the sintered body is cut. From the viewpoint of excellent wear resistance, heat resistance and the like, a cutting tool made of cermet or a cutting tool coated with a cermet by PVD (Physical Vapor Deposition) can be particularly preferably used. The cermet is a material obtained by sintering and bonding ceramics such as carbides and nitrides with metal.

(Optional step)
As an optional step which the method for producing an iron-based sintered member may have, a mixing step of mixing powder, a degreasing step of removing an organic substance and the like, a recompression step of compressing a sintered body, a surface of a sintered body The surface treatment process etc. which are processed are mentioned.

(Iron-based sintered member)
The iron-based sintered member obtained by the above manufacturing method can be preferably used as a bubble guide, a valve seat and the like which are components of a valve mechanism of an engine; a rotor core and the like which is a component of a motor;

Embodiments of the present invention will be specifically described by way of examples. Embodiments of the present invention are not limited to the following examples.

<Preparation of iron-based powder mixture>
Example 1
Atomized iron powder with a maximum particle size of 180 μm or less, electrolytic copper powder with a maximum particle size of 150 μm or less, natural graphite powder with an average particle size of 10 μm, and calcium behenate powder with an average particle size of 20 μm are charged into a V-type mixer for 10 kg. Mix for 30 minutes to obtain an iron-based powder mixture. The mixing ratio (mass%) of each powder based on iron powder is shown in Table 1.

Comparative Example 1
An iron-based powder mixture was prepared in the same manner as in Example 1 except that the calcium behenate powder was changed to zinc stearate powder having an average particle diameter of 13 μm. The mixing ratio (mass%) of each powder based on iron powder is shown in Table 1.

<Evaluation of machinability of sintered body>
Example 2
A sintered body was produced using the iron-based powder mixture obtained in Example 1 according to the following method. The machinability of the sintered body was evaluated by cutting the sintered body and confirming the wear amount and surface condition of the cutting tool.

(Production of sintered body)
Molding step The iron-based powder mixture was filled in a mold, and the pressure was adjusted so that the density of the molded body was 6.6 g / cm ³ to obtain a molded body with an outer diameter of 50 mm, an inner diameter of 30 mm, and a total length of 20 mm. .
In the molding step, the molded product can be extracted from the mold in a good state, and the molded product does not have defects such as galling and chipping. The calcium behenate powder provided a sufficient lubricating effect.

Sintering Step The compact is preheated at 600 ° C. for 15 minutes in a non-oxidizing atmosphere (under N ₂ +5 volume% H ₂ atmosphere) in a sintering furnace, and subsequently at 1,130 ° C. The mixture was heated for 20 minutes to obtain a sintered body.

(Evaluation of wear amount of cutting tool)
The end face of the sintered body was cut by lathing until the cutting distance became 3.8 km. Lathe processing was performed according to the following conditions. FIG. 1 is a schematic view showing a lathe process. In FIG. 1, 1 indicates a cutting tool, 4 indicates a holder, 5 indicates a sintered body, FIG. 1 (a) is a schematic side view, and FIG. 2 (b) is a schematic front view.

Cutting machine: NC lathe (Numerical Control lathe),
Cutting tool: Cermet indexable insert (material: NX2525, "TNMG160404" manufactured by Mitsubishi Materials Corporation)
Cutting speed: 250 m / min
Feeding: 0.10 mm / rev
Removal cost: 0.15 mm

When a predetermined cutting distance (0.75, 1.50, 2.25, 3.00, 3.75 km) is reached, the cutting tool is observed with a digital microscope ("VHX-1000" manufactured by Keyence Corporation) The width of the wear portion on the flank of the cutting tool was measured, and the measured value was taken as the amount of wear. FIG. 2 is a schematic perspective view showing the cutting tool after it has been used for cutting. In FIG. 2, 1 indicates a cutting tool, 2 indicates a rake face, 3 indicates a flank, 3a indicates a worn portion of the flank, and 3b indicates a width of the worn portion. 2a is a deposit described later. FIG. 3 is a photograph obtained by observing and photographing a part of the cutting tool after 3.75 km of cutting with a digital microscope. Moreover, FIG. 4 is a graph which shows the relationship between cutting distance and the abrasion loss of a flank.

As shown in FIG. 4, the sintered body produced using the iron-based powder mixture containing calcium behenate powder can significantly suppress the wear of the cutting tool, and the machinability is excellent. . If an iron-based powder mixture containing calcium behenate powder is used, the deterioration of the cutting tool can be prevented, so that the manufacturing cost of the iron-based sintered member can be suppressed.

(Evaluation of surface condition of cutting tool)
The scooped surface of the cutting tool after 1.5 km and 3.75 km of cutting was observed with a scanning electron microscope ("EPMA-1600 W" manufactured by Shimadzu Corporation, magnification 200 times), and deposits were observed. The The photograph on the left side of FIG. 5 is a scanning electron micrograph of a portion of the rake face of the cutting tool after 3.75 km of cutting, and the deposits are indicated by arrows in the photograph. In addition, as a result of performing elemental analysis with an electron beam microanalyzer (“EPMA-1600W” manufactured by Shimadzu Corporation, measurement conditions: acceleration voltage 15 kV, sample current 100 nA), it was confirmed that the deposit contains calcium. .

As shown in FIG. 5, when a sintered body produced using an iron-based powder mixture containing calcium behenate powder was cut, a deposit containing calcium was formed on the surface of the cutting tool. The deposit containing calcium is considered to have reduced the wear of the cutting tool.

Comparative Example 2
A sintered body was produced in the same manner as in Example 2 except that the iron-based powder mixture obtained in Comparative Example 1 was used. Further, the machinability of the sintered body was evaluated in the same manner as in Example 2 except that the cutting distance was changed. FIG. 4 shows the relationship between the cutting distance and the wear amount of the flanks. As a result of observation with a scanning electron microscope, no deposit could be confirmed on the cutting tool after 1.5 km of cutting. The photograph on the right side of FIG. 5 is a scanning electron micrograph of a portion of the rake face of the cutting tool after 1.5 km of cutting.

As shown in FIG. 4, the sinter produced using an iron-based powder mixture not containing calcium behenate powder was inferior in machinability. Poor machinability requires frequent replacement of the cutting tool, which increases the manufacturing cost of the iron-based sintered member.

According to the iron-based powder mixture according to the embodiment of the present invention, a sintered body having high machinability can be obtained. Moreover, according to the method for manufacturing an iron-based sintered member that is an embodiment of the present invention, an iron-based sintered member can be efficiently manufactured.

The disclosure of the present application is related to the subject matter described in Japanese Patent Application No. 2017-231624 filed on Dec. 1, 2017, the entire disclosure of which is incorporated herein by reference.

1 cutting tool 2 rake face 2a deposit 3 flank face 3a wear part 3b wear part width 4 holder 5 sintered body

Claims

An iron-based powder mixture comprising a main raw material powder containing at least one selected from the group consisting of iron powder and iron alloy powder, an auxiliary raw material powder, and a calcium salt powder of a higher fatty acid.
The iron-based powder mixture according to claim 1, wherein the calcium salt powder of higher fatty acid comprises calcium behenate powder.
The iron-based powder mixture according to claim 1 or 2, wherein the content of the calcium salt powder of the higher fatty acid is 0.1 to 1.2% by mass with respect to the total mass of the main raw material powder.
A forming step of forming the iron-based powder mixture according to any one of claims 1 to 3 to obtain a formed body,
A sintering step of sintering the molded body to obtain a sintered body;
A cutting process for cutting the sintered body;
The manufacturing method of the iron-type sintered member which has.
A forming step of forming the iron-based powder mixture according to any one of claims 1 to 3 to obtain a formed body,
A sintering step of sintering the compact to obtain a sintered body,
A heat treatment step of heat-treating the sintered body to obtain a heat-treated body;
A cutting process for cutting the heat-treated body,
The manufacturing method of the iron-type sintered member which has.
A forming step of forming the iron-based powder mixture according to any one of claims 1 to 3 to obtain a formed body,
A sintering step of sintering the compact to obtain a sintered body,
A steam treatment step of subjecting the sintered body to steam treatment to obtain a steam treated body;
A cutting process for cutting the steam treated body;
The manufacturing method of the iron-type sintered member which has.
The method of manufacturing an iron-based sintered member according to any one of claims 4 to 6, wherein the cutting process is performed using a cutting tool containing at least titanium on the surface.