Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
  • B22F3/02—Compacting only
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C33/00—Making ferrous alloys
  • C22C33/02—Making ferrous alloys by powder metallurgy
  • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
  • C22C33/0264—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements the maximum content of each alloying element not exceeding 5%
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
  • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
  • B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
  • B22F1/105—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing inorganic lubricating or binding agents, e.g. metal salts
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
  • B22F3/10—Sintering only
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
  • B22F2998/10—Processes characterised by the sequence of their steps
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

• the present invention relates to an iron-based powder in which an iron-based powder is mixed with a lubricant and, if necessary, an alloying powder.
• Iron-based powder mixture Iron-based mixed powder of the present invention
• the powder is also suitable for powder metallurgy, especially mixed powder suitable for compaction in the temperature range from room temperature to less than 100 ° C.
• the present invention further relates to a powder mixture for powder metallurgy suitable for the production of high strength sintered parts for automobiles.
• the present invention provides a method for producing an iron-based powder molded body (compacted body) using the iron-based mixed powder as a raw material, and an iron-based powder sintered body (sintered powder) using the iron-based powder molded body as a raw material. body).
• Iron-based mixed powders for powder metallurgy are mixed with iron-based powders by adding lubricants, composite powders, and, if necessary, powders of free cutting addi- tives. It is common to manufacture.
• the iron-based powder is the main component of the mixed powder, and mainly used is iron powder (including pure iron powder) and alloy steel powder (alloyed steel powder). It is done.
• Alloy steel powder is a steel powder containing alloy components, and powders that do not contain C are also used as alloy steel powder, but here we collectively refer to alloy steel powder containing C and alloy iron powder not containing C. This is referred to as alloy steel powder.
• alloy steel powder was bound to the pure iron powder by portions diffuse the alloying elements, partially diffused alloyed steel powder (partly diffused al loyed steel powder) mosquitoes s also use ⁇ , I or also ferroalloys herein One kind of powder.
• the lubricant is an additive for facilitating removal from the mold after pressure molding or molding.
• Various materials can be used as lubricants, but iron-based powders It is selected in consideration of the mixability with the powder and the dissipative property during sintering.
• examples of lubricants include zinc stearate, aluminum stearate, and lead stearate. Further, various lubricants are exemplified in, for example, US Pat. No. 5,256,185.
• Alloy powders are added mainly for the purpose of adjusting the composition and structure of iron-based powder compacts and iron-based powder sintered bodies.
• Graphite powder, copper powder, iron phosphide powder, molybdenum powder, nickel Examples include powder.
• the machinability improving powder (free cutting ingredients) is added to improve the machinability of the sintered body, and includes S and Mn S.
• S and Mn S are added to improve the machinability of the sintered body.
• a warm forming technology has been developed that enables high density and high strength of molded products by forming iron-based mixed powder while heating. This technology makes it possible to improve the density of compacts at lower loads by taking advantage of the fact that iron-based powders are reduced in plastic deformation resistance by heating.
• iron-based mixed powders are also desired to solve the problem of machinability.
• powder and metallurgical mixed powder is filled into a mold, compacted and then sintered.
• the parts of the various machines thus obtained (hereinafter referred to as sintered parts) usually have a density of 5.0 to 7.2 g / cm 3 .
• sintered parts have good dimensional accuracy and can be manufactured in complex shapes.
• Sintered parts are used as parts for a variety of equipment, but parts for automobiles (eg gears) are required to have high strength and fatigue characteristics. Therefore, in order to produce sintered parts with high strength and high fatigue properties, various techniques for using mixed powders for powder metallurgy with alloy components added have been studied. For example, in Japanese Patent Publication No. 45-9649, Ni, Cu, Mo and other powders are diffused and adhered to pure Fe powder, which is suitable for the manufacture of sintered parts with high strength and high fatigue characteristics and excellent compressibility. Also, mixed powders for powder metallurgy are disclosed. In addition, as a mixed powder for powder metallurgy suitable for the production of high-strength sintered parts, Japanese Patent Application Laid-Open No.
• 61-163239 discloses a low alloy steel containing C and Mo but practically free of Mn and Cr. powdered, was added Cu powder and / or N i powder, further mixed powder for powder metallurgy was added graphite powder, also in JP-a-6 3-114903, containing Mo, Mn, and C A mixed powder for powder metallurgy in which Cu powder is fused to alloy steel powder is disclosed.
• powder metallurgy technology when manufacturing sintered parts that require extremely strict dimensional accuracy, it is necessary to perform machining (for example, cutting and drilling) after sintering.
• machining for example, cutting and drilling
• the free-cutting component has the effect of easily breaking chips or forming a thin component edge on the surface of the cutting tool to increase the lubricity of the cutting tool (especially the rake face).
• the free-cutting component containing S as a main component contaminates the firing furnace like MoS 2 described above.
• the techniques disclosed in Japanese Patent Publication No. 45-9649, Japanese Patent Publication No. 61-163239, Japanese Patent Publication No. 63-114903, etc. have a very high hardness of the sintered parts obtained, so free cutting Even if the ingredients are added to the powder mixture for powder metallurgy, no significant improvement in machinability is expected.
• Mg0 / Si0 2 is 0.5 or more and less than 1.0 in molar ratio.
• Mg0-S i0 2 complex oxides for example, anhydrous talc
• Japanese Patent Laid-Open No. 64-79302 discloses MgO-Si0 2 complex oxides.
• the present invention advantageously solves the above-mentioned problems, and does not adversely affect the in-furnace environment of the sintering-forming furnace when the molded body is sintered, and has a high density in a low temperature range of less than 100 ° C.
• the purpose is to propose an iron-based mixed powder for powder metallurgy that can be molded and has excellent formability.
• Another object of the present invention is to provide a suitable iron-based mixed powder for powder metallurgy.
• the present invention also proposes a method for producing an iron-based powder spherical body using the iron-based mixed powder as a raw material, and a method for producing an iron-based powder sintered body using the iron-based powder compact as a raw material. With the goal.
• the inventors do not adversely affect the in-furnace environment when forming the iron-based mixed powder, and lower the heating temperature of the iron-based mixed powder, preferably Even when it was molded without heating, we intensively studied lubricants that enable the production of high-density molded products.
• the present invention is based on the above findings. That is, the gist configuration of the present invention is as follows. (1) An iron-based mixed powder characterized by containing an iron-based powder and, as an additive, at least one selected from talc opi steaite and a fatty acid amide.
• Mo 0.3 to 0.5 mass 0/0
• Mn 0.1 to 0.25 contains mass%
• water Atomaizu alloy steel powder consisting of unavoidable impurities balance and Contact Fe
• Cu powder 1 3 wt. /
• graphite powder 0.5: and L 0 mass 0/0
• An iron-based mixed powder characterized by
• An iron-based powder compact characterized by filling the mold with the iron-based mixed powder according to any one of (1) to '(6) above and molding at a temperature of less than 100 ° C. Manufacturing method.
• the iron-based mixed powder according to any one of the above (1) to (6) is filled in a mold and molded at a temperature of less than 100 ° C.
• a method for producing an iron-based powder sintered body characterized by sintering Note that the content of alloys (Mo, Mn, etc.) in the iron-based powder, and the amount of alloy powder (Cu powder, graphite powder, etc.) to be added, talc, and steaite are both iron-based mixed. It refers to the ratio of the powder to the mass.
• the present invention will be specifically described.
• the raw material for the iron-based mixed powder of the present invention will be described.
• the content of the alloy component in the iron-based powder and the blending amount of each raw material occupy the mass (100% by mass) of the iron-based mixed powder obtained by mixing them. It shall be indicated by the weight ratio of the number.
• the alloy content (including the amount of partially diffused alloy) in the iron-based powder is expressed as a weight ratio to the iron-based powder.
• examples of the iron-based powder include pure iron powder such as atomized iron powder and reduced iron powder, or alloy steel powder.
• alloy steel powder partially diffused alloyed steel powder and fully alloyed steel powder (alloy components are included from the time of melting), and further alloy components are partially diffused in fully alloyed steel powder. Examples include hybrid steel powder.
• the total amount of impurities in the iron-based powder may be about 3 mass% or less.
• Typical impurity content is C: 0.05 mass% or less, Si: 0.10 mass 0 /.
• Cr, Mn, Ni, Mo, V, Ti, Cu, Nb, etc. can be alloyed as alloy steel powder, and especially Ti, Ni, Mo, Cu, etc. can be added by diffusion bonding.
• the content of other alloy elements is not limited.
• the average particle diameter of the iron-based powder is preferably in a normal range used for powder metallurgy, that is, about 70 to 100 ⁇ m.
• the particle size of the powder is a value measured by a sieving method in accordance with JIS standard Z 2510 unless otherwise specified.
• JIS standard Z 2510 JIS standard Z 2510
• Mo 0. 3 to 0 5 weight 0/0
• Mn 0.. 0. 1 ⁇ 0 25 mass 0/0
• the balance Fe Contact Fully alloyed steel powder which is an inevitable impurity, is preferred. From the viewpoint of productivity, it is preferable to use a water alloyed alloy steel powder produced by water atomizing a steel having the above composition.
• Mo is an element that enhances the strength of sintered parts by strengthening the solid solution of alloy steel powder and improving hardenability. If the Mo content is less than 0.3% by mass, the effect of increasing the strength of the sintered part by Mo cannot be obtained. On the other hand, if it exceeds 0.5% by mass, the effect of improving the strength of the sintered part is saturated, and the machinability is unnecessarily lowered. Therefore, Mo is preferably in the range of 0.3 to 0.5% by mass.
• Mn is an element that enhances the strength of sintered parts by strengthening the solid solution of hydrogenated alloy steel powder and improving hardenability. If the Mn content is less than 0.1% by mass, the effect of increasing the strength of the sintered part by Mn cannot be obtained. On the other hand, if it exceeds 0.25 mass%, the oxidation of Mn tends to proceed, and the strength and compressibility of the alloy steel powder decrease. Thus, Mn is preferably in a range of 0.1 to 0.25 mass 0/0.
• the balance other than the above components is preferably Fe and inevitable impurities. Inevitable impurities are inevitably mixed at the stage of melting molten steel, which is the raw material of hydrogenated alloy steel powder, and at the stage of producing water atomized alloy steel powder from molten steel. ⁇
• the suitable manufacturing method of the water atomized alloy steel powder which can be used suitably by said invention is demonstrated.
• Molten steel containing the prescribed components ie, the above
• the obtained powder is subjected to finish reduction and pulverization to obtain permanent atomized alloy steel powder.
• An apparatus for obtaining powder from molten steel by the water atomization method is not limited to a specific type, and a conventionally known apparatus may be used.
• alloy powders include graphite powder, metal powders such as Cu, Mo and Ni, pollon powder and cuprous oxide powder. These alloy powders are made of iron-based powder. By mixing at the end, the strength of the sintered body can be increased.
• the amount of alloying powder is preferably a child and about the iron-based mixed powder 0. l ⁇ 10 mas s%. This is because, by adding 0.1 lmass% or more of the alloy powder, the strength of the obtained sintered body is advantageously improved, whereas when it exceeds 10 mas S %, the dimensional accuracy of the sintered body decreases. It is.
• iron-based powder example 1 especially Cu powder: 1 to 3 mass. / 0 and black bell flour: It is preferable to add 0.5 to 1.0% by mass.
• the main component of graphite powder is an element that increases the strength of sintered parts by strengthening the solid solution of water atomized alloy steel powder and improving hardenability. If the amount of graphite powder added is less than 0.5% by mass, the desired degree of effect cannot be obtained in iron-based powder example 1. On the other hand, if it exceeds 1.0 mass%, the strength of the sintered part will increase more than necessary, and the machinability will unnecessarily decrease. Therefore, the graphite powder is in the range of 0.5 to 1.0 mass%.
• Cu is an element that increases the strength of sintered parts by strengthening the solid solution of alloy steel powder and improving hardenability. Also, Cu powder melts into a liquid phase during sintering, and the particles of alloy steel powder adhere to each other. If the amount of Cu powder added is less than 1% by mass, the desired effect in the iron-based powder example 1 cannot be obtained. On the other hand, if it exceeds 3% by mass, the effect of improving the strength of the sintered parts will be saturated, and the machinability will be unnecessarily reduced. Therefore, Cu powder should be in the range of 1 to 3% by mass.
• the addition method can be performed by adding Cu powder to the alloy steel powder and simply mixing it.
• a method of attaching Cu powder to the surface via a binder may be used.
• alloy steel powder and Cu powder are mixed and heat-treated to cause Cu powder to diffuse and adhere to the surface of the alloy steel powder, resulting in partially diffused alloyed steel powder (or hybrid alloy). (Chemical steel powder).
• talc Mg O-4 Si 0 2
• steatite is also called baked talc
• the main component is enstatite (Mg O ⁇ Si 0 2 ) It is.
• talc steaite When added together with fatty acid amide, talc steaite exhibits a remarkable effect as a lubricant. Further, talc Ya Suteatai bets is a kind of Mg O-Si_ ⁇ 2 based composite oxide is known as a free-cutting component, by further added additive with the metal ore ⁇ , exert remarkable effect as free-cutting component To do.
• talc Ya Suteatai bets is a kind of Mg O-Si_ ⁇ 2 based composite oxide is known as a free-cutting component, by further added additive with the metal ore ⁇ , exert remarkable effect as free-cutting component To do.
• the reason why the above-mentioned talc steaite is blended as a lubricant improves the compressibility of the molded body and at the same time reduces the punching force during molding and greatly improves the moldability. it is conceivable that.
• talc, steatite, and boron nitride are easily cleaved along the crystal plane when the material is subjected to shear stress between iron-based powder particles during molding. It is considered that the density of the compact is improved as a result of the reduction in frictional resistance and the ease of movement between particles. This effect is effective in the region where the compression pressure is relatively low. On the other hand, in the high pressure region, the fatty acid amide penetrates thinly between the particles and exhibits the effect of reducing the frictional resistance. In this way, the frictional resistance is reduced over the entire compression range, so it seems to have a synergistic effect in improving the density of the compact.
• talc steaite is present between the molded body and the mold, it will be cleaved due to the shear stress from the mold surface when the molded body is pulled out, making it easier for the molded body to slide on the mold surface. This is thought to improve and reduce the output.
• the heating temperature of the iron-based powder can be set as appropriate according to the required density of the compact, but the heating temperature is sufficient to be less than 100 ° C. More preferably, it is 80 ° C or lower.
• a sintered part manufactured using the mixed powder for powder metallurgy according to the present invention has a high strength equivalent to that of a conventional high strength sintered part and can also have extremely excellent machinability.
• the blending amount exceeds 0.5% by mass, the compressibility of the mixed powder is lowered, and there is a concern that the mechanical strength and the like of the sintered material obtained by sintering the compact are reduced.
• a more preferable upper limit is 0.3% by mass, and in order to substantially eliminate the influence on the mechanical properties of the sintered body, the upper limit is preferably 0.2% by mass or less. It is preferable that talc has a monoclinic or triclinic crystal structure, steatite has a monoclinic crystal structure, and boron nitride has a hexagonal crystal structure.
• the size of talc steaite is preferably about 1 to 10 / X m in particle size.
• At least one fatty acid amide is blended as a lubricant.
• the fatty acid amide is preferably at least one selected from fatty acid monoamides (such as stearic acid monoamide) and fatty acid bisamides (such as ethylene bis-stear mouth amide and methylene bis-stear mouth amide).
• the iron-based mixed powder can effectively be used for praying and dust generation.
• the fluidity and moldability can be further improved.
• fatty acid amide may be mixed with fatty acid, but this is not particularly prohibited.
• the amount of the fatty acid amide described above is preferably about 0.01 to 0.5% by mass in the iron-based mixed powder. This is because if the blending amount is less than 0.01% by mass, the effect of the addition is poor, while if it exceeds 0.5% by mass, the strength of the green compact decreases.
• the lower limit is more preferably when 0.0 3% by weight of the iron-based powder is pure iron powder, a case 0.05% by weight of the alloy steel powder, a more preferred upper limit is 0.4 wt%, iron-based powder GaJun In the case of iron powder, a more preferred upper limit is 0.3% by mass.
• a metal sarcophagus can be further blended.
• metal sarcophagus is removed here as a lubricant.
• metal sarcophagus examples include zinc stearate, lithium stearate, and calcium stearate. Of these, zinc stearate and lithium stearate are particularly preferred.
• the blending amount of the metal stalagmite is preferably about 0.01 to 0.5% by mass in the iron-based mixed powder. This is because if the combined amount is less than 0.01% by mass, the effect of addition is poor, while 0.5% by mass. This is because the strength of the green compact decreases when the ratio exceeds / 0 .
• a more preferable lower limit is 0.05% by mass or more, and a more preferable upper limit is 0.3% by mass. /. It is.
• the total addition amount of the fatty acid amide and the metal sarcophagus is preferably 0.1% by mass or more and 1.0% by mass. A more preferred lower limit is 0.2% by mass. A more preferred upper limit is 0.6 mass. / 0 .
• the total amount of talc * steatite, fatty acid amide and metal stalagmite is preferably about 0.01 to 2.0% by mass in the iron-based mixed powder.
• a more preferred lower limit is 0.15% by mass, and a more preferred upper limit is 0.8% by mass.
• the iron-based mixed powder of the present invention does not require any other additive, but it is free to add a known additive such as a surface modifier (such as siloxane) to about 0.5% by mass or less. is there.
• a known additive such as a surface modifier (such as siloxane) to about 0.5% by mass or less. is there.
• a force similar to that of the first method may be such that only a part of the raw materials described above is added to the iron-based powder and subjected to primary mixing, and then the remainder is added to perform secondary mixing.
• the secondary mixed raw material exists in the mixed powder in a free state.
• a particularly preferred example is that at least one part of the metal sarcophagus is subjected to secondary mixing, the remaining raw material is subjected to primary mixing, and a fatty acid amide or a co-melt of this and the metal sarcophagus as the binder.
• This is a method using. In this method, the amount of each raw material added to the iron-based powder can be minimized.
• the means for mixing the iron-based powder and each raw material is not particularly limited, and any conventionally known mixer can be used. Among them, a high-speed bottom-stirring mixer (high-speed mixer), which is easy to heat, and a rotating blade.
• the counter current mixer, the rotary share mixer and the coni cal mixer are particularly advantageous. ' 2007/053125
• the iron-based mixed powder of the present invention can be formed into a molded body by a normal molding method. Specifically, iron-based mixed powder is filled into a mold and further compacted. As a generally suitable condition for compacting, it is preferable that the applied pressure is 400 to 1000 MPa.
• the mold may be heated to 50 to 70 ° C. Alternatively, the mixed powder for powder metallurgy and the mold may be heated to 80 to 130 ° C.
• the iron-based mixed powder of the present invention can be molded at a sufficiently high density even at room temperature, and room temperature molding is preferred from the viewpoint of productivity. Nonetheless, it is advantageous to heat the iron-based mixed powder or mold or apply a lubricant to the mold.
• the temperature of the iron-based mixed powder and the mold is preferably less than 100 ° C. This is because the iron-based mixed powder according to the present invention has excellent compressibility and exhibits excellent formability even at temperatures below 100 ° C, and there is a concern of deterioration due to oxidation at temperatures above 100 ° C. . More preferably, it is 80 ° C. or lower.
• the high-density iron-based powder molded body obtained as described above is taken out from the mold and subjected to a sintering treatment to obtain a high-density sintered body.
• the sintering treatment is not particularly limited, and any conventionally known sintering treatment method can be suitably used. Sintering is preferably performed at a heating temperature of 1100 to 1600 ° C and a heating time of 10 to 60 minutes.
• Table 1 shows the types of various iron powders for powder metallurgy used in Examples 1 to 4 as iron-based powders (both have an average particle size of about 80 m).
• alloy steel powder it is a fully alloyed steel powder, a partially alloyed steel powder, or even a high-prid steel powder in which the alloy components are partially diffused in the fully alloyed steel powder. A distinction is shown.
• Various lubricant powders were added to various iron-based powders and natural graphite powders (average particle size: and / or copper powder (average particle size: 25 ⁇ )) shown in Table 2. after heating to 140 ° C while mixing at high speed bottom stirring type mixer, cooled below 60 ° C, further adding various lubricant powder (secondary additives), 1 minute at 500 r P m ⁇ After that, the mixed powder was discharged from the mixer
• the types and blending amounts of the primary and secondary additives are listed in Table 2.
• the amount of lubricant added (parts by mass) is the same as the iron-based powder and natural graphite powder.
• the ratio of the total mass with copper powder to 100% is shown as an external number. It is almost the same as the numerical value.
• the average particle size of talc powder and steatite powder was 6 ⁇ m, respectively.
• each obtained iron-based mixed powder was filled into a cemented carbide tablet mold having an inner diameter of 11 mm at room temperature and pressure-molded at 490 MPa and 686 MPa. At that time, the output when the molded body was extracted from the mold and the green density of the obtained molded body were measured.
• the obtained iron-based mixed powder was separately compacted with a test piece for cutting test (outer diameter 60 mm, inner diameter 20 mm, length 30 mm).
• the pressing force for compacting was 59 OMPa.
• Sintering was performed in an RX gas atmosphere, the heating temperature was 1130 ° C, and the heating time was 20 minutes.
• a cermet cutting tool was used to perform a cutting test at a cutting speed of 200 mZ, feed 0. lnnii / turn, cutting depth 0.3 mm, cutting distance 1000 m, and the flank of the cutting tool.
• the wear width was measured. The smaller the wear width of the flank of the cutting tool, the better the machinability of the sintered body. The results obtained are shown in Table 4.
• EBS Ethylene bissuaramide
• STZN Suarin 3 ⁇ 4Ash &
• STAM Suarin monoamide
• STLI Suarin lithium Table 3
• each iron-based mixed powder at room temperature was obtained, and heated as previously Kiyabiti wall temperature is 80 ° C inside diameter: 11 was filled in a cemented carbide Taburetsu preparative the negation, pressurized with 49 0 MPa and 686MPa Press molded. At that time, the extraction force when the molded body was extracted from the mold and the green density of the obtained molded body were measured.
• the mold was heated to 130 ° C and filled into a carbide tablet mold with an inner diameter of 11mm, and 490MPa and 686MPa. Was pressure molded. At that time, the output when the molded body was extracted from the mold and the green density of the obtained molded body were measured.
• Example 2 a test specimen for a cutting test was compacted to adjust the machinability.
• flank wear width of each invention example decreased to about 20 to 40% of the comparative example of the same system (number), and a remarkable improvement was also seen in the machinability.
• the mixed powder mixed with the mold container rotary mixer was produced.
• each iron-based mixed powder obtained was heated to 60 ° C, and then heated beforehand so that the cavity wall surface temperature was 80 ° C, and further, lithium stearate powder was applied to the wall surface. Filled into a cemented carbide tablet mold and pressure molded at 490 and 686 MPa. At that time, the output when the molded body was extracted from the mold and the green density of the obtained molded body were measured. ⁇
• the comparative material was heated to general warm forming conditions, that is, to 120 ° C, and then the mold was heated to 130 ° C and filled into a carbide tablet mold with an inner diameter of 11 mm. 490 and 686 MPa was pressure molded. At that time, the output when the molded body was extracted from the mold and the green density of the obtained molded body were measured.
• Example 2 a test specimen for cutting test was compacted and the machinability was investigated.
• flank wear width (mm) of each invention example was reduced to about 25 to 35% of the comparative example of the same system (number), and a marked improvement was also seen in machinability.
• each obtained iron-based mixed powder was filled into a cemented carbide tablet mold having an inner diameter of 11 mm at room temperature, and pressure-molded at 490 MPa and 686 MPa. At that time, the output when the molded body was extracted from the mold and the green density of the obtained molded body were measured.
• the obtained iron-based mixed powder is separately prepared for tensile test pieces and cutting test pieces (outer diameter 60 mni, inner diameter 20 mni, length in accordance with JPMA M04-1S92). 30 mm) was compacted. Pressure of compacting was 5 9 0 MPa. Sintering was performed in an RX gas atmosphere, the heating temperature was 1130 ° C, and the heating time was 20 minutes.
• the machinability evaluation method is the same as in Example 1.
• Water atomized alloy steel powder having the components shown in Table 11 was produced by the water atomizing method. The balance other than Mn and Mo is Fe and inevitable impurities. Its water atomized alloy Cu powder, graphite powder, talc, and stearite were added to the steel powder in the proportions shown in Table 11. Incidentally, Mo content of ice atomized steel powder in, Mn content (mass ./.) And Mizua Tomaizu steel powder Cu powder to be added, graphite powder, talc, amount of Suteatai bets (mass 0/0) Indicates the ratio in the mass of the mixed powder for powder metallurgy. Further, a lubricant was added at a ratio shown in Table 11.
• the amount of lubricant added indicates the ratio to the mass (100 parts by mass) of the mixed powder for powder metallurgy obtained by mixing water-hamized alloy steel powder and additive in an external number. It is almost the same as the numerical value).
• the mixture was mixed in a V-type blender, and the resulting mixed powder for powder metallurgy was filled into a mold, and a tensile test piece and a test piece for cutting test in accordance with JPMA M04-1992 (outer diameter 60 mm , The inner diameter was 20 ⁇ and the length was 30mm).
• the pressing force for compacting was 590 MPa.
• Sintering was performed in an RX gas atmosphere, the heating temperature was 1130 ° C, and the heating time was 20 minutes.
• Table 11 shows the tensile strength obtained by the tensile test.
• the invention example is an example using a mixed powder for powder metallurgy that satisfies the scope of the present invention
• the comparative example is an example using a mixed powder for powder metallurgy that falls outside the scope of the present invention.
• the conventional example of No. 22 is a conventional lubricant for mixed powder for powder metallurgy using Fe-4Ni-l.5Cu-0.5Mo-based water atomized alloy steel powder, which has been put to practical use. Is an example of blending.
• the numerical value attached to the alloy element of No. 22 represents mass%. Sintering cutting
• EBS Ethylene bissuaramito "
• STZN Suarin ffifiS
• STAM Monoaluminum sulphate
• STLI Lithium sulphate * 3 Ratio to 100 parts by mass of powder mixture for powder metallurgy (external number)
• the water Atomaizu alloy steel powder is Mo: 0. 3 ⁇ 0. 5 mass 0/0 and Mn:. Containing 0.1 to 0 25 wt%, and, Cu powder: 1 3% by weight and graphite powder When containing 0.5 to 0.5% by mass, a sintered body having a tensile strength of 500 MPa or more and excellent in machinability can be obtained.
• an iron-based mixed powder having a high molding density and a small punching power even if it is molded at a temperature as low as room temperature. Further, according to the present invention, a mixed powder for powder metallurgy suitable for manufacturing a sintered part having excellent machinability, particularly a high strength sintered part can be obtained.
• an iron-based powder molded body having a high forming density, an iron base having a high sintered density, or a further excellent machinability by using the iron-based mixed powder as a raw material, an iron-based powder molded body having a high forming density, an iron base having a high sintered density, or a further excellent machinability.
• a powder sintered body can be obtained.

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