+

WO2006114849A1 - Palier miniature et son procede de fabrication - Google Patents

Palier miniature et son procede de fabrication Download PDF

Info

Publication number
WO2006114849A1
WO2006114849A1 PCT/JP2005/007048 JP2005007048W WO2006114849A1 WO 2006114849 A1 WO2006114849 A1 WO 2006114849A1 JP 2005007048 W JP2005007048 W JP 2005007048W WO 2006114849 A1 WO2006114849 A1 WO 2006114849A1
Authority
WO
WIPO (PCT)
Prior art keywords
bearing
molding
less
molded body
powder
Prior art date
Application number
PCT/JP2005/007048
Other languages
English (en)
Japanese (ja)
Inventor
Yoshimitsu Kankawa
Hiroshi Setowaki
Hiroshi Satomi
Motoi Fukuda
Original Assignee
Mold Research Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mold Research Co., Ltd filed Critical Mold Research Co., Ltd
Priority to PCT/JP2005/007048 priority Critical patent/WO2006114849A1/fr
Publication of WO2006114849A1 publication Critical patent/WO2006114849A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/02—Parts of sliding-contact bearings
    • F16C33/04—Brasses; Bushes; Linings
    • F16C33/06—Sliding surface mainly made of metal
    • F16C33/14—Special methods of manufacture; Running-in
    • 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
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/10—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of articles with cavities or holes, not otherwise provided for in the preceding subgroups
    • B22F5/106—Tube or ring forms
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/20—Shaping by sintering pulverised material, e.g. powder metallurgy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/40—Shaping by deformation without removing material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2220/00—Shaping
    • F16C2220/40—Shaping by deformation without removing material
    • F16C2220/48—Shaping by deformation without removing material by extrusion, e.g. of metallic profiles

Definitions

  • the present invention relates to a microporous bearing and a method for manufacturing the same.
  • the present invention has been made in consideration of the problems in the prior art as described above, and has a high dimensional accuracy, especially a micro bearing having a small dimensional accuracy, and does not generate cracks. It is an object of the present invention to provide a porous bearing having a desired porosity and a method by which such a bearing can be manufactured without sizing.
  • the present invention relates to a method for producing a micro bearing having an outer diameter of 2 mm or less and an inner diameter of 1 mm or less, which is a metal powder having an average particle diameter of 1 to 150 ⁇ m or a ceramic having an average particle diameter of 0.1 to 10 ⁇ m.
  • An organic binder of 30 to 70 vol% (vol% with respect to the total amount of the molding composition) is added to metal powder having an average particle size of 1 to 150 m or ceramic powder having an average particle size of 0.1 to 10 / zm.
  • a primary molded body is produced using the molding composition, and then the primary molded body is inserted into a heated press mold and pressed to obtain a conventional molded body (press molding, extrusion molding and injection molding). It is possible to obtain a secondary molded body having a higher dimensional accuracy than a molded body obtained by only the process.
  • thermosetting resin having an average particle size of 10 to 150 ⁇ m is added to obtain desired pores.
  • the rate can be further increased.
  • a metal or ceramic micro bearing having a weight of 0.1 lg or less, an outer diameter of 2 mm or less, an inner diameter of 1 mm or less, and an inner dimensional accuracy of ⁇ 0. Furthermore, it is a micro or small bearing made of metal or ceramics with a weight of 0.1 lg or less, an outer diameter of 1.5 mm or less, an inner diameter of 0.7 mm or less, and an inner diameter dimensional accuracy of ⁇ 0.005 mm or less. Therefore, it is possible to manufacture with high dimensional accuracy.
  • an ultra-small porous bearing having an outer diameter of 2 mm or less and an inner diameter of 1 mm or less can be manufactured with very high dimensional accuracy.
  • FIG. 1 is a process diagram showing a production method according to the present invention.
  • FIG. 2A is a diagram showing an embodiment of a micro bearing according to the present invention
  • FIG. 2B is a micro bearing according to the present invention, which is an embodiment of a bearing having a flange.
  • FIG. 1 shows a process for producing a microporous bearing according to the present invention, and a molded body cross-sectional model in each process.
  • an organic binder and, if necessary, a thermosetting resin powder to increase the porosity are added to the metal powder or ceramic powder that is the raw material powder, and the mixture is heated and kneaded using a heating kneader. As a result, a molding composition in which each material is uniformly dispersed is obtained.
  • the metal powder two or more kinds of powders having an average particle diameter of 1 to 150 ⁇ m and different average particle diameters may be mixed.
  • the average particle size is 0.1 ⁇ : LO / z m.
  • V Two or more powders with different average particle sizes may be mixed.
  • the powder used is not particularly limited.
  • metal powder copper, silver, gold, iron, nickel
  • One or more of chromium, conoretole, tungsten, anoremi, titanium, manganese, or an alloy containing one or more of these metals can be used.
  • the ceramic powder a powder having one or more kinds of carbides, nitrides and oxides containing aluminum, titanium, tungsten, silicon, zircon, calcium and magnesium as elements can be used.
  • the powder has a small average particle diameter
  • the powder per unit volume in the molding composition The percentage of the end increases. Therefore, the filling rate of the powder into the thin wall portion can be increased, and the strength of the thin wall portion after sintering can be increased.
  • the average particle size is too small, the strength of the bearing increases, but the sintered density increases, making it difficult to ensure the desired porosity.
  • the average particle size of the powder is too small, it becomes difficult to put the molding composition into the molding machine during molding, and the molding composition does not smoothly enter the molding machine. Stability during molding decreases.
  • the average particle size of the powder is too large, the filling rate of the powder in the thin-walled portion will be low, which may reduce the strength of the bearing after sintering.
  • the average particle size of the metal powder used in the present invention is preferably 1 to 150 m, more preferably 10 to 50 m.
  • the average particle size of the ceramic powder used in the present invention is preferably 0.1 to 10 ⁇ m, more preferably 0.5 ⁇ m to 5 ⁇ m.
  • the content of the metal or ceramic powder to be used is preferably 30 to 70 vol%, more preferably 30 to 70 vol% of the entire molding composition. If the content is less than the lower limit, the dimensional accuracy after degreasing and sintering may be reduced.
  • Examples of the organic binder include: polyolefins such as polyethylene, polypropylene, and ethylene acetate copolymer; acrylic resins such as polymethyl methacrylate and polybutyl methacrylate; and styrene resins such as polystyrene. And various types of waxes, paraffins, higher fatty acids (eg, stearic acid), higher alcohols, higher fatty acid esters, higher fatty acid amides, etc. Species or a mixture of two or more can be used.
  • the content of the organic binder is preferably 30 to 70 vol% of the entire molding composition, more preferably 35 to 60 vol%. If the content is less than the lower limit value, the molding pressure may not be sufficiently transmitted, and the filling of the thin portion may be insufficient. On the other hand, if the content exceeds the upper limit value, the dimensional accuracy may decrease or the shape may be deformed after degreasing and sintering.
  • thermosetting resin powder having an average particle size of 10 to 150 ⁇ m may be added in addition to the powder and the organic binder to produce a molding composition.
  • the content of thermosetting resin is preferably 1-30 vol% of the entire molding composition. More preferably, it is 1 to 15 vol%.
  • thermosetting resin examples include epoxy resin, urethane resin, melamine resin, and phenol resin. From the viewpoint of thermal decomposability, epoxy resin and urethane resin are preferable.
  • thermosetting resins behave as powders in the same manner as metal powders and ceramic powders that are used without being melted when the materials are kneaded. Since these thermosetting resin decomposes and disappears with the decomposition of the organic binder during the degreasing process, pores corresponding to the volume of the added thermosetting resin occur after the degreasing process. Since the pores are retained even after sintering, the porosity increases as the amount added increases. If the amount of thermosetting resin added exceeds the upper limit, the amount of pores will increase and the strength after sintering will decrease. Also, the improvement in porosity expected when the amount added is below the lower limit is not observed.
  • the kneading conditions of the molding composition vary depending on various conditions such as the composition and particle size of the powder used, the composition of the organic binder, the composition and shape of the thermosetting resin to be added, and the blending amount thereof.
  • the kneading temperature can be about 100 to 250 ° C.
  • the kneading time can be about 30 to 120 minutes.
  • the molding composition requires different shapes depending on the molding method.
  • the obtained molding composition is pulverized to have an average particle size of about 50 to about LOO m.
  • a pulverizer such as a pin disk or a hammer mill is suitable for the pulverizer used at this time.
  • pellets small lumps
  • the particle size of the pellet can be set to about 1 to 15 mm, for example.
  • a primary molded body having a desired shape and size is produced by press molding, extrusion molding or injection molding.
  • the dimensions and shape of the mold are determined in anticipation of the dimensional shrinkage after sintering.
  • the molding method can be selected according to the desired product shape. In particular, injection molding is desirable when forming a molded body having a complicated shape.
  • a molding composition pulverized to an average particle size of 50 to LOO ⁇ m is put into a mold and compression molding is performed. At this time, depending on the shape of the product to be produced, a primary compact is produced by applying a molding pressure of about 1 to 50 tons.
  • a molding composition is injection-molded by an injection molding machine to obtain a desired shape and size.
  • a primary molded body is produced.
  • a molded body having a complicated and fine shape can be easily manufactured by selecting a molding die.
  • the molding conditions for injection molding vary depending on various conditions such as the composition and particle size of the powder used, the composition of the organic binder, the composition of the thermosetting resin to be added, and the amount of these blended, but the molding temperature is preferably 100 to 100. About 200 ° C, and the injection pressure is preferably about 300 to 1000 kgfZcm 2 .
  • extrusion molding is performed using a mold having a desired shape by an extruder.
  • the molding composition temperature is determined by the cross-sectional shape of the product, preferably 50-200 ° C.
  • the pressure is 50 ⁇ 500kgf Zcm 2.
  • the primary molded body obtained by the above press molding, injection molding, and extrusion molding is inserted into a heated press mold in order to increase the dimensional accuracy, and pressed to produce a secondary molded body.
  • the dimensional accuracy of the molded body can be increased.
  • conventional molded bodies molded bodies obtained only by the press molding, extrusion molding and injection molding processes
  • the dimensional accuracy is high. Can be obtained.
  • the pressing conditions for obtaining the secondary compact can be changed depending on the shape of the compact.
  • the mold temperature during pressing is preferably 50 to 150 ° C.
  • the heating temperature is 180 ° C or higher, the cooling time after pressing becomes longer and the productivity decreases.
  • the heating temperature is 50 ° C or less, it is difficult to ensure the dimensions of the secondary molded body defined by the press mold.
  • molding pressure for obtaining a secondary molded article around 100 ⁇ 1500KgfZcm 2 is desirable. If it is higher than 200 OkgfZcm 2 , the internal stress increases, which may cause problems such as cracking and deformation after molding or after degreasing and sintering. In addition, if the molding pressure is lower than lOkgfZcm 2 , the secondary compact may deviate from the dimensions specified in this pressing process.
  • the secondary molded body after pressing is cooled and taken out in a mold.
  • the temperature during removal is preferably 10 to 80 ° C.
  • the cooling shrinkage becomes large, and cracks may occur at the time of taking out.
  • the temperature at the time of taking out becomes higher than a predetermined temperature, the molded body is insufficiently cooled, so that the secondary molded body may be deformed and dimensional accuracy may be lowered.
  • the secondary molded body obtained by the above-described method is excellent in dimensional accuracy, and is in a state where the organic binder and the thermosetting resin added as needed are uniformly dispersed in the powder.
  • the maximum degreasing temperature is preferably 400 ° C or higher. When the maximum degreasing temperature is 300 ° C or less, the organic binder and thermosetting resin are not sufficiently decomposed and remain as carbides, which may cause defects such as cracks in the sintered product.
  • the degreasing atmosphere is determined according to the compositional components of the powder used.
  • the optimum degreasing temperature is 400 ° C to 800 ° C. If there is residual carbon resulting from the organic binder and the added thermosetting resin after degreasing, the maximum temperature in hydrogen is 800 ° C. Reduction treatment is performed to remove residual carbon.
  • the obtained degreased body is sintered by adjusting the sintering temperature according to the powder used so that the porosity becomes 10 to 50 vol%.
  • the sintering conditions vary depending on the powder material used. 1000-1400 ° C for stainless steel materials, 900-1200 ° C for titanium materials, 700-00 for copper materials: L100 ° C, 1000-1000 for iron materials 1400 ° C is desirable. For these metals, nitrogen, argon, vacuum, or hydrogen is used as the sintering atmosphere as required.
  • the sintering conditions differ depending on the powder used in ceramics: 1300-1700 for alumina and 1000-1500 for zirconia. . Sintered with. By the above sintering step, powder diffusion and grain growth proceed, and the sintering density increases.
  • the porosity of the obtained sintered body is preferably 10 to 50 vol%, more preferably 12 to 40 vol%, and particularly preferably 15 to 40 vol%. If the porosity is too low, the oil content decreases and the desired function as a bearing cannot be obtained. Also, if the porosity is too high, the mechanical strength may decrease.
  • the inner diameter of the bearing in the present invention is the narrowest part of the bearing hollow portion.
  • the outer diameter of the bearing refers to the outer diameter of the narrowest part in the outer shape of the bearing. If the bearing has multiple flanges, the outer diameter of the flange refers to the outer diameter of the smallest flange.
  • Example 1 the method for manufacturing the bearing of the present invention will be described with reference to examples.
  • Example 1 the method for manufacturing the bearing of the present invention.
  • the bearing shown in FIG. 2A was produced using the method according to the present invention.
  • Stainless steel powder (SUS316L) was used as the metal powder. A powder with an average particle size of 10 / z m was used.
  • organic binder a mixture in which polystyrene, polybutylmethallate, ethylene acetate butyl copolymer, and raffin wax were mixed at a ratio of 15: 15: 20: 50 was used.
  • the composition of the molding composition was 65 vol% stainless powder + 35 vol% organic binder.
  • the powder and organic binder are kneaded using a heat kneader at 160 ° C for 1 hour, and the resulting kneaded product is pulverized using a hammer mill, and sifted to force a particle size of 50 to LOO ⁇ m. I made a thing.
  • the molding composition obtained by sieving was molded at a pressure of 5000 kgf / cm 2 using a pressure press machine to obtain a primary molded body.
  • the mold used had an outer diameter of 1.2 mm, an inner diameter of 0.6 mm, and a height of 1.867 mm.
  • the primary molded body obtained by the above press molding is inserted into a press mold (mold size: outer diameter 1.3 mm, inner diameter 0.5 mm, height 1.4 mm), and heated and pressure press molded, A secondary molded body was obtained.
  • the molding conditions were a pressure of 800 kgf / cm 2 , a mold temperature of 100 ° C, and when the compact was cooled to 50 ° C, it was removed from the press die.
  • the obtained secondary compact was degreased at a maximum temperature of 500 ° C ⁇ nitrogen atmosphere, and the degreased compact was sintered at a maximum temperature of 1100 ° C ⁇ argon atmosphere.
  • the product (bearing) weight obtained was 0. Olg.
  • the bearing In order to make an oil-impregnated bearing by impregnating the pores of the obtained bearing with bearing oil, the bearing is immersed in lubricating oil, placed in a vacuum furnace, the inside of the furnace is evacuated, and placed in the furnace for 30 minutes. Was confirmed to be impregnated and removed from the furnace.
  • the bearing shown in FIG. 2A was produced using the method according to the present invention.
  • Stainless steel powder (SUS316L) was used as the metal powder.
  • thermosetting resin In order to increase the porosity, urethane resin having an average particle size of 30 m was used as a thermosetting resin.
  • organic binder a mixture in which polyacetal, polypropylene, and paraffin wax were mixed at a ratio of 25:25:50 was used.
  • the composition of the molding composition was stainless powder 55 vol% + urethane resin 1 Ovol% + organic binder 35 vol%.
  • Stainless steel powder, organic binder, and urethane resin are kneaded using a heating kneader at 160 ° C for 1 hour, and the resulting kneaded product is pulverized using a nonmmer mill and sieved to give a particle size of 50 to 100 ⁇ m.
  • a molding composition was prepared.
  • the molding composition obtained by sieving was molded at a pressure of 5000 kgf / cm 2 using a pressure press machine to obtain a primary molded body.
  • the mold used had an outer diameter of 1.2 mm, an inner diameter of 0.6 mm, and a height of 1.867 mm.
  • the primary molded body obtained by the above press molding is inserted into a press mold (mold size: outer diameter 1.3 mm, inner diameter 0.5 mm, height 1.4 mm), and heated and pressure press molded, A secondary molded body was obtained.
  • the molding conditions were a pressure of 800 kgf / cm 2 and a mold temperature of 90 ° C. When the compact was cooled to 50 ° C, it was removed from the press die.
  • the obtained secondary compact was degreased at a maximum temperature of 500 ° C. ⁇ nitrogen atmosphere, and the degreased compact was sintered at a maximum temperature of 1250 ° C. under an argon atmosphere.
  • the product (bearing) weight obtained was 0. Olg.
  • the bearing shown in FIG. 2A was produced using the method according to the present invention.
  • Stainless steel powder (SUS316L) was used as the metal powder. A powder with an average particle size of 10 / z m was used.
  • thermosetting resin for increasing the porosity.
  • organic binder a mixture in which polyacetal, polypropylene, and paraffin wax were mixed at a ratio of 25:25:50 was used.
  • the composition of the molding composition was stainless powder 55 vol% + urethane resin 1 Ovol% + organic binder 35 vol%.
  • Stainless steel powder, organic binder and urethane resin were kneaded using a heat kneader at 160 ° C. for 1 hour, and the obtained kneaded product was made into pellets having a length of 1 to 5 mm using a granulator.
  • Injection molding was performed using the obtained pellets. Molding was performed at a molding temperature of 180 ° C, a molding pressure of 1000 kgf / cm 2 , an injection speed of 30 mm / min, and a mold temperature of 30 ° C to obtain a primary molded body.
  • the mold used was an outer diameter of 1.2 mm, an inner diameter of 0.6 mm, and a height of 1.867 mm.
  • the primary molded body obtained by the above injection molding is inserted into a press die (die size: outer diameter 1.3 mm, inner diameter 0.5 mm, height 1.4 mm), and heated and pressed under pressure. The next molded body was obtained.
  • the molding conditions were a pressure of 800 kgf / cm 2 and a mold temperature of 80 ° C. When the compact was cooled to 40 ° C, it was removed from the press die.
  • the obtained secondary compact was degreased at a maximum temperature of 500 ° C. ⁇ nitrogen atmosphere, and the degreased compact was sintered at a maximum temperature of 1250 ° C. under an argon atmosphere.
  • the product (bearing) weight obtained was 0. Olg.
  • the bearing shown in FIG. 2A was produced using the method according to the present invention.
  • Alumina powder was used as the ceramic powder.
  • a powder with an average particle size of 1 m was used.
  • the composition of the molding composition used was a mixture of polystyrene, ethylene-vinyl acetate copolymer, polybutyl methacrylate, and ⁇ Raffine wax in a ratio of 15: 15: 20: 50 as the organic filler. % + Organic binder 40 vol%.
  • the alumina powder and the organic binder were kneaded using a heat kneader at 150 ° C. for 1 hour, and the resulting kneaded product was formed into pellets having a length of 1 to 5 mm using a granulator.
  • the obtained pellets were heated to 120 ° C. using an extrusion molding machine to produce a primary molded body.
  • the mold used had an outer diameter of 1.2 mm, an inner diameter of 0.6 mm, and a height of 1.867 mm.
  • the primary molded body obtained by the above extrusion molding is inserted into a press die (die size: outer diameter 1.3 mm, inner diameter 0.5 mm, height 1.4 mm), and heated and pressed under pressure. The next molded body was obtained.
  • the molding conditions were a pressure of 700 kgf / cm 2 and a mold temperature of 65 ° C. When the compact was cooled to 20 ° C, it was removed from the press die.
  • the obtained secondary compact was degreased at a maximum temperature of 400 ° C ⁇ air atmosphere, and the degreased compact was sintered at a maximum temperature of 1500 ° C and air atmosphere.
  • the obtained product (bearing) weight was 0.005 g.
  • a bearing shown in FIG. 2B was produced using the method according to the present invention.
  • Stainless steel powder (SUS316L) was used as the metal powder. A powder with an average particle size of 10 / z m was used.
  • thermosetting resin having an average particle diameter of 30 m was used as a thermosetting resin for increasing the porosity.
  • organic binder a mixture in which polyacetal, polypropylene, and paraffin wax were mixed at a ratio of 25:25:50 was used.
  • the composition of the molding composition was stainless powder 55 vol% + urethane resin 1 Ovol% + organic binder 35 vol%.
  • Stainless steel powder, organic binder and urethane resin are kneaded using a heat-kneader at 160 ° C for 1 hour, and the resulting kneaded product is pulverized using a non-mer mill and sieved to give a particle size of 50 to 100 ⁇ m A molding composition was prepared.
  • the molding composition obtained by sieving was molded at a pressure of 5000 kgf / cm 2 using a pressure press machine to obtain a primary molded body.
  • the mold used was an outer diameter of 1.2 mm, an inner diameter of 0.5 mm, and a height of 1.9 mm.
  • the primary compact obtained by the above press molding is inserted into a press die (die size: inner diameter 0.5 mm, outer diameter 1.3 mm, flange outer diameter 2. Omm, height 1.4 mm) and heated. Then, press molding was performed to obtain a secondary molded body.
  • the molding conditions were a pressure of 800 kgf / cm 2 and a mold temperature of 90 ° C. When the compact was cooled to 50 ° C, the press mold force was taken out.
  • the obtained secondary compact was degreased at a maximum temperature of 500 ° C. ⁇ nitrogen atmosphere, and the degreased compact was sintered at a maximum temperature of 1250 ° C. under an argon atmosphere.
  • the product (bearing) weight obtained was O.Ollg.
  • the porosity was calculated by the following formula.
  • Porosity ⁇ 1 (apparent density Z true density) ⁇ X 100
  • the apparent density was obtained by measuring with a helium gas substitution type density measuring device Accupick (manufactured by Shimadzu Corporation) in a state where the bearing surface was coated with wax to keep the pores inside.
  • the true density was determined by measuring with a helium gas substitution type density measuring device Accupick without coating the bearing with wax or the like.
  • Stainless steel powder (SUS316L) was used as the metal powder. Stainless steel powder with an average particle size of 70 / zm was used. As an organic binder, 20 vol% of stearic acid was added. Stainless powder and stearic acid were dry mixed using a V blender.
  • Press molding was performed using the obtained pellet material.
  • the force at which molding was performed at a molding pressure of 10,000 kgf / cm 2
  • the molding material was not filled completely into the mold. For this reason, degreasing and sintering after molding were stopped.
  • Alumina powder was used as the ceramic powder.
  • Alumina powder with an average particle size of 1 ⁇ m was used.
  • a granular powder was prepared by adding 20 vol% stearic acid to the ceramic powder.
  • the granulated granular powder had a particle size of 100 to 150 ⁇ m.
  • the obtained granular powder was used for press molding.
  • the force at which molding was performed at a molding pressure of 10,000 kgf / cm 2
  • the molding material was not filled completely into the mold. For this reason, degreasing and sintering after molding were stopped.
  • the applied amount of the organic binder is generally 20 vol% or less.
  • the size of the mold is small. In comparison with Comparative Examples 1 and 2, it was found that the molding pressure was not sufficiently transmitted by this method and the molding material was not filled in the mold.
  • the bearing shown in FIG. 2A was manufactured under exactly the same conditions as in Example 1 except that there was no “step of producing a primary molded body, inserting it into a heated press die, and applying pressure”.
  • Stainless steel powder (SUS316L) was used as the metal powder. A powder with an average particle size of 10 m was used.
  • organic binder a mixture in which polystyrene, polybutylmethalylate, ethylene acetate butyl copolymer, and raffin wax were mixed at a ratio of 15: 15: 20: 50 was used.
  • the composition of the molding composition was 65 vol% stainless powder + 35 vol% organic binder.
  • the powder and organic binder are kneaded using a heat kneader at 160 ° C for 1 hour, and the resulting kneaded product is pulverized using a hammer mill and sieved to form a composition with a particle size of 50 to L00 ⁇ m. I made a thing.
  • the molding composition obtained by sieving was molded at a pressure of 5000 kgf / cm 2 using a pressure press machine to obtain a molded body.
  • the mold used was an outer diameter of 1.3 mm, an inner diameter of 0.5 mm, and a height of 1.4 mm.
  • the obtained compact was degreased at a maximum temperature of 500 ° C ⁇ nitrogen atmosphere, and the degreased compact was sintered at a maximum temperature of 1100 ° C ⁇ argon atmosphere.
  • the bearing shown in FIG. 2A was manufactured under exactly the same conditions as in Examples 2 to 4 except that there was no “step of producing a primary molded body, inserting it into a heated press die, and applying pressure”.
  • Comparative Example 4 The comparative example corresponding to Example 2 is referred to as Comparative Example 4, and the comparative examples corresponding to Examples 3 and 4 are referred to as Comparative Examples 5 and 6 in the following order.
  • Comparative Example 3 Similar to Comparative Example 3, in Comparative Examples 4 to 6, press molding, extrusion molding or injection using a mold for molding (mold size: outer diameter 1.3 mm, inner diameter 0.5 mm, height 1.4 mm) A molded body was produced in one step by molding, and the resulting molded body was degreased and sintered to produce a bearing. In each of Comparative Examples 3 to 6, create 30 bearings and calculate the porosity and dimensional accuracy. did.
  • Table 1 shows the results of Examples and Comparative Examples.
  • the bearing manufactured using the method of the present invention has a dimensional accuracy that is an order of magnitude higher than that of a bearing manufactured by only one stage without performing hot press molding. It was revealed.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)

Abstract

L’invention fournit un palier poreux miniature ayant des dimensions précises. L’invention concerne un procédé pour fabriquer un palier miniature ayant un diamètre externe de 2 mm ou moins et un diamètre interne de 1 mm ou moins, qui comprend une étape consistant à ajouter un liant organique à une poudre d'un métal ou d’une céramique, de façon à préparer une composition pour le formage, une étape consistant à préparer un premier produit formé par compression, extrusion ou injection en utilisant la composition ci-dessus pour formage, une étape consistant à insérer le premier produit formé ci-dessus dans un moule pour compression chauffé, suivie de la compression, de façon à préparer de ce fait un second produit formé, et une étape consistant à dégraisser et ensuite fritter le second produit formé ci-dessus, de façon à préparer de ce fait un article fritté.
PCT/JP2005/007048 2005-04-12 2005-04-12 Palier miniature et son procede de fabrication WO2006114849A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2005/007048 WO2006114849A1 (fr) 2005-04-12 2005-04-12 Palier miniature et son procede de fabrication

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2005/007048 WO2006114849A1 (fr) 2005-04-12 2005-04-12 Palier miniature et son procede de fabrication

Publications (1)

Publication Number Publication Date
WO2006114849A1 true WO2006114849A1 (fr) 2006-11-02

Family

ID=37214487

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2005/007048 WO2006114849A1 (fr) 2005-04-12 2005-04-12 Palier miniature et son procede de fabrication

Country Status (1)

Country Link
WO (1) WO2006114849A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1884332A3 (fr) * 2006-08-05 2011-01-05 Karlsruher Institut für Technologie Connection et procédé pour sa fabrication
JP2016008669A (ja) * 2014-06-25 2016-01-18 ポーライト株式会社 焼結含油軸受及びリニアアクチュエータ
CN110566585A (zh) * 2018-06-06 2019-12-13 斯凯孚公司 通过金属注射成型工艺的滚动轴承圈

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3001500U (ja) * 1994-02-28 1994-08-30 ポーライト株式会社 微小軸受体
JP2001145909A (ja) * 1999-09-10 2001-05-29 Seiko Instruments Inc セラミックスの成形方法
JP2004162165A (ja) * 2002-06-14 2004-06-10 Snecma Moteurs 乾燥自己潤滑性高密度材料、該材料から形成された機械部品、該材料の製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3001500U (ja) * 1994-02-28 1994-08-30 ポーライト株式会社 微小軸受体
JP2001145909A (ja) * 1999-09-10 2001-05-29 Seiko Instruments Inc セラミックスの成形方法
JP2004162165A (ja) * 2002-06-14 2004-06-10 Snecma Moteurs 乾燥自己潤滑性高密度材料、該材料から形成された機械部品、該材料の製造方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1884332A3 (fr) * 2006-08-05 2011-01-05 Karlsruher Institut für Technologie Connection et procédé pour sa fabrication
JP2016008669A (ja) * 2014-06-25 2016-01-18 ポーライト株式会社 焼結含油軸受及びリニアアクチュエータ
CN110566585A (zh) * 2018-06-06 2019-12-13 斯凯孚公司 通过金属注射成型工艺的滚动轴承圈

Similar Documents

Publication Publication Date Title
CN1863630B (zh) 制造接近成品轮廓的高孔隙度金属模制体的方法
US7232473B2 (en) Composite material containing tungsten and bronze
US5028367A (en) Two-stage fast debinding of injection molding powder compacts
JP2017519101A (ja) サーメット又は超硬合金粉末の作製方法
JPH0686608B2 (ja) 金属粉末射出成形による鉄焼結体の製造方法
US5095048A (en) Method of manufacturing a composition for use in injection molding powder metallurgy
JP2002129204A (ja) 多孔性金属の製造方法
CN102188933B (zh) 造粒粉末以及造粒粉末的制造方法
JP6756994B1 (ja) 積層造形用粉末、積層造形物の製造方法及び積層造形物焼結体の製造方法
JP2004517215A (ja) 高密度の成形部品を製造するための粉末冶金法
JPH07164196A (ja) とちの製造方法
US20030170137A1 (en) Forming complex-shaped aluminum components
CN113369477A (zh) 一种孔隙率可调的多孔材料制备方法
JP2010222155A (ja) 炭化珪素質焼結体及びその製造方法
JPH0692603B2 (ja) 金属焼結体製造用金属粉末及びこれを用いた金属焼結体製品の製造方法
CN107034375A (zh) 一种利用氢化钛粉制备高致密度钛制品的方法
WO2006114849A1 (fr) Palier miniature et son procede de fabrication
US20040146424A1 (en) Production of component parts by metal injection moulding (mim)
JP2008214664A (ja) 焼結体の製造方法および焼結体
CN114367663B (zh) 一种全致密复杂形状钛合金薄壁零部件的制备方法
JP2010007141A (ja) 焼結含油軸受材およびその製造法
JP3761551B2 (ja) 焼結チタンフィルタ
JPH11315304A (ja) 焼結体の製造方法
JPH0637643B2 (ja) 射出成形用組成物
JP6809373B2 (ja) マイクロカプセルおよびそれを用いたセラミックスの製造方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

NENP Non-entry into the national phase

Ref country code: RU

WWW Wipo information: withdrawn in national office

Country of ref document: RU

122 Ep: pct application non-entry in european phase

Ref document number: 05730194

Country of ref document: EP

Kind code of ref document: A1

WWW Wipo information: withdrawn in national office

Ref document number: 5730194

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: JP

点击 这是indexloc提供的php浏览器服务，不要输入任何密码和下载