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公开(公告)号：JPH08176601A
公开(公告)日：1996-07-09
申请号：JP33557594
申请日：1994-12-20
发明人： OZAKI TSUTOMU , SAKAMOTO HIDEAKI , KANAYAMA TATSUYA , NAKAYAMA AKIRA , YAMAMOTO EIJI , MARUYAMA MASAO
摘要： PURPOSE: To uniformly and finely mix hydrocarbon of methane series in a slurry and to prevent the occurrence of coarse particles by adding a specified amt. of the hydrocarbon having a specified m.p. to hard powder, mixing and pulverizing them under cooling. CONSTITUTION: Hydrocarbon of methane series having 20-80 deg.C m.p. is added by 0.1-5 pts.wt. to 100 pts.wt. hard powder of stock such as cermet or ceramics and they are mixed and pulverized in lower alcohol while cooling a prepd. slurry to a temp. below the m.p. of the hydrocarbon by >=10 deg.C. The resultant slurry is passed through a >=200-mesh screen. The cooling is carried out, e.g. by circulating temp.-controlled cooling water through a mixer having a jacket system. The melting and recrystallization of the hydrocarbon in the slurry can be prevented, and When the slurry is passed through the screen, the rate of passing is not reduced and blocking is not caused.
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公开(公告)号：JPH08143904A
公开(公告)日：1996-06-04
申请号：JP29079994
申请日：1994-11-25
发明人： KANAYAMA TATSUYA , SATO EIJI , MARUYAMA MASAO , MAEDA YOSHIKI
摘要： PURPOSE: To prevent the deposition of a hard powder on a mold and to form a green compact excellent in dimensional accuracy by pressing the hard powder filled in a mold and controlling the temp. of the obtained green compact or the mold to be below a reference temp. CONSTITUTION: A hard powder mixed with an appropriate lubricant is filled in a mold consisting of an outer die 1, an upper punch 2 and a lower punch 3, pressed and continuously compacted to obtain a green compact 6. In this pressing method, an IR thermometer 7 and an analyzer 8 are used to measure the temp. of the green compact 6 discharged from the mold or the mold. Further, the measured temp. is compared with the preset reference temp. in a press controller 9, and an outer die driver 4 and an upper punch driver 5 are controlled so that the temp. of the green compact or mold does not exceed the reference temp. Consequently, the lubricant in the hard powder is not softened or liquefied, the hard powder does not deposit on the mold, and the green compact is not burred or chipped.
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公开(公告)号：JPH08117580A
公开(公告)日：1996-05-14
申请号：JP28886694
申请日：1994-10-27
发明人： MATSUMOTO HIDEKAZU , KANAYAMA TATSUYA , NAKAYAMA AKIRA , YAMAMOTO EIJI , HONMA HIROYUKI , MARUYAMA MASAO
摘要： PURPOSE: To conduct economical mixing by measuring power necessary for mixing and pulverization of raw material powder and feeding back the change to the mixing conditions in a method for mixing hard powder in which raw material hard powder, hard media, and liquid solvents are mixed and pulverized. CONSTITUTION: An open wet type mixer is composed of a stirring blade 1 with blades 2, hard media 3, a jacket 4, a cooling pipeline 5, and a heat exchanger 6. After paraffin which improves the compressibility of of raw material hard powder and powder after pelletization is fed into the mixer, a solvent is added so that the raw material hard powder, paraffin, and hard media 3 are immersed, and the stirring blade 1 is rotated by a motor M to conduct mixing. In this process, slurry is heated with the passage of time to reduce the viscosity so that the load of the motor M is reduced to reduce power consumption. Therefore, power necessary for the mixing and pulverization of raw material powder is measured, and the change is fed back to the process conditions to control the mixing conditions.
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公开(公告)号：JPH0790306A
公开(公告)日：1995-04-04
申请号：JP25937993
申请日：1993-09-22
摘要： PURPOSE:To produce a granulated powder excellen in fluidity and to obtain an alloy high in dimensional precision without defects such as cavities from the granulated powder by spray-driving slurry consisting of an organic solvent and a raw powder such as cermet, thereby forming granulated powder having prescribed fluidity. CONSTITUTION:The slurry is prepared by mixing an organic solvent such as alcohol, hexane with a raw powder such as a cemented carbide or cermet. The density, viscosity and concn, of the slurry are adjusted to 10 to 50% in terms of the ratio to the true density of the powder, 10 to 500cps and 50 to 80wt.%, respectively. The slurry is granulated by spray-drying it into a granulated powder having 0.24 to 0.04sec/cc fluidity measured by using the measuring funnel whose orifice diameter is 8mm and other shapes are specified by JIS Z-2502.
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公开(公告)号：JPH073306A
公开(公告)日：1995-01-06
申请号：JP27526992
申请日：1992-09-17
申请人： KAMODA SHUICHI , SAKAI MASAHIRO , MIYAKOSHI YASUKI , MAKINO ISAO , HOKKAIDO SUMIDEN SEIMITSU KK , SUMITOMO ELECTRIC INDUSTRIES
发明人： KAMODA SHUICHI , SAKAI MASAHIRO , MIYAKOSHI YASUKI , MAKINO ISAO , KANAYAMA TATSUYA , YAMAGUCHI KAZUHIRO , MARUYAMA MASAO , SHIBATA ISAO , MINATO YOSHIHIRO
摘要： PURPOSE:To join a sintered hard alloy and a sintered hard alloy for joining or these alloys and steel with high strength by specifying the ratio of the bond phase in the sintered hard alloy for joining of the composite material formed by diffusion joining the high-hardness sintered hard alloy and the sintered hard alloy for joining. CONSTITUTION:The high-hardness sintered hard alloy is obtd. by producing a disk- shaped press-molded product 2 consisting of ductile and tough sintered hard alloy powder 1 formed by mixing WC powder and Co powder having, for example, 5.0mu average grain size at 89% WC-11wt.% Co. This sintered hard alloy is sintered for one hour at 1400 deg.C in a vacuum sintering furnace. This plunger body 2 is inserted into a sintered hard alloy die 3 and the sintered hard alloy powder for joining which is a powder mixture composed of 60% WC-40% Co of the above-mentioned powders is laminated thereon at 15mm thickness and is pressurized under about 1ton/cm . The resultant combination body is taken out and is subjected to hot press sintering for one hour under 50kg/cm at 1250 deg.C in a vacuum atmosphere. The sintering is so executed that the ratio of the bond phase in the sintered hard alloy for joining is higher by 10 to 45wt.% than the ratio of the bond phase in the high-hardness sintered hard alloy at that time.
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公开(公告)号：JPH05247608A
公开(公告)日：1993-09-24
申请号：JP8461492
申请日：1992-03-05
发明人： MARUYAMA MASAO , NAKAGAKI HIROSHI
摘要： PURPOSE:To improve the hardness of powdery high speed steel without deteriorating its toughness by incorporating the carbides or nitrides of Ta, Nb and Ti into powdery high speed steel. CONSTITUTION:Powdery high speed steel is incorporated with >=two kinds among the carbides or nitrides of Ta, Nb and Ti. At this time, the weight ratio of TaC/NbC is preferably regulated to the range of 1/10 to 10/1. Furthermore, Tac/(NbC+TiC) is preferably regulated to the range of 1/10 to 10/1. Moreover, the total solid soln. of the three kinds including TaC is preferably contd. by 0.5wt.%. The objective powdery high speed steel is obtd., prior to the compacting of the base metal powder, by adding>=two kinds among the carbides or nitrides of Ta, Nb and Ti in a powdery state, mixing them, thereafter once subjecting the mixture to primary compacting by a hot press and subsequently executing sintering and hot hydrostatic compacting.
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公开(公告)号：JPH04131303A
公开(公告)日：1992-05-06
申请号：JP25381590
申请日：1990-09-21
发明人： MARUYAMA MASAO , SHIRANE YOSHINORI
摘要： PURPOSE:To manufacture the above hard alloy powder suitable to pressing by adding solvent to the specific element constitution of raw material powder, wet-mixing, pulverizing and drying the powder. CONSTITUTION:To the raw material powder consisting of cemented carbide and cermit composed of carbide, nitride and carbonitride of IVa group, Va group and VIa group metal elements in the periodic table of elements and iron group metal elements, ethanol containing 2-15wt.% water is added as solvent, the mixture is wet-mixed, pulverized and further, dried. The reson why the content of ethanol to be added to 100% water is specified to 2-15wt.% is that in the case of
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公开(公告)号：JPH03257103A
公开(公告)日：1991-11-15
申请号：JP5575590
申请日：1990-03-06
摘要： PURPOSE:To safely pulverize a green compact with good pulverizing efficiency at low cost by pulverizing the green compact of hard alloy containing binder with a pulverizer after cooling. CONSTITUTION:In the pulverization of the green compact of hard alloy containing paraffine, etc., as the binder, after cooling this green compact, this is pulverized with the pulverizer. Cooling temp. of the above green compact is desirable to be 0-100 deg.C. Further, as the hard alloy, cermet containing TiC as the essential component or cemented carbide containing WC as the essential component, etc., is used. Further, as the above pulverizer, impact type pulverizer is suitable. By the above method, where the green compact is cooled and pulverized, dissolution of the binder is prevented and lowering of the pulverizing efficiency is prevented and danger of ignition is avoided and by this method the cost can be made to low in comparison with wet type pulverizing method.
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公开(公告)号：JPH03208811A
公开(公告)日：1991-09-12
申请号：JP334690
申请日：1990-01-12
IPC分类号： C01B32/949
摘要： PURPOSE:To safely and directly produce superfine WC powder from WO3 in simplified producing stages by mixing WO3 powder with carbon powder, heating the mixture in a flow of gaseous N2, then heating and pulverizing the mixture in gaseous H2. CONSTITUTION:WO3 powder of
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公开(公告)号：JPH02141504A
公开(公告)日：1990-05-30
申请号：JP29317388
申请日：1988-11-18
发明人： MARUYAMA MASAO , NODA SHIGERU , IWAMI KENJI , INOUE TOSHIO
摘要： PURPOSE:To obtains a drill having spiral oil holes at the prescribed position with the ordinary equipment by applying pressing system using a spiral core rod in a metallic mold at the time of obtaining super hard alloy-made drill attaching outer circumferential groove having penetrated inner part oil hole. CONSTITUTION:For example, the PVC-made spiral core rods 5 are set to upper and lower punches 6, 7 in the metallic mold and an outer cylinder covering the core rods 5 is fitted and the super hard alloy powder is packed therein and isostatic press forming is executed to make a mold-pressed body, and after pulling out the core rod 5, sintering is executed. Then, at the time of packing the powder by applying pressure from the outer circumferential part, there are a problem 1, which the core rod 5 itself is deformed, and a problem 2, which the core rod 5 is difficult to pull out from the mold-pressed body having weak mechanical strength. In order to solve the problem 1, the tip parts of the core rods 5 is fitted as movable in radius direction near the most outer circumferential parts of long holes 8, 8 arranged in a punch 7, for example, packing an elastic body in the hole 8. Further, in order to solve the problem 2, lubricant of paraffine, etc., is beforehand applied on the core rod 5. By this method, the drill 1 having the oil holes 2 is obtd.
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