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公开(公告)号：JPH04198478A
公开(公告)日：1992-07-17
申请号：JP33165790
申请日：1990-11-29
Applicant: TOYOTA MOTOR CORP , TOYOTA CENTRAL RES & DEV
Inventor： KOYAMA HARATSUGU , MIYAMOTO NORITAKA , AOYAMA SATOSHI , ANDO KIMIHIKO , NAKAGAWA MASAHIRO , HIOKI TATSUMI , ITO AKIO
Abstract: PURPOSE:To obtain a steel member having superior rolling fatigue resistance by roughening the carburized, hardened and tempered surface of a steel member and implanting nitrogen ions into the roughened surface. CONSTITUTION:The surface of a steel member such as a bearing member is carburized by gas, solid or liq. carburization, hardened and tempered to form a carburized layer having about 2% C content. The surface of this layer is roughened to -8X10 ions/cm . A steel member such as bearing member hardly causing pitting and having superior rolling fatigue resistance can stably be produced.
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公开(公告)号：JPH0472051A
公开(公告)日：1992-03-06
申请号：JP18328690
申请日：1990-07-11
Applicant: TOYOTA MOTOR CORP
Inventor： KOYAMA HARATSUGU , NAKAGAWA MASAHIRO , SHIMODA KENJI
Abstract: PURPOSE:To prevent the overheating of a sprayed deposit and to prevent various disadvantages due to overheating by forming a sprayed deposit while applying cooling to the internal surface of a cylinder bore by introducing a refrigerant into a passage formed by covering the opening of a cooling jacket. CONSTITUTION:The opening of a cooling jacket 3 provided to the periphery of a cylinder bore 2 is covered, e.g. with a cover plate 4, by which a passage connecting one end of the above jacket 3 to the other end is formed. A material having wear resistance and corrosion resistance is thermally sprayed while applying cooling to the internal surface of the above cylinder bore 2 by introducing a refrigerant into the above passage by which a sprayed deposit is formed. By this method, the cooling effect is increased and the overheating of the sprayed deposit can be prevented, and the shape precision of the cylinder bore can be improved.
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公开(公告)号：JPH03180479A
公开(公告)日：1991-08-06
申请号：JP31772489
申请日：1989-12-08
Applicant: TOYOTA MOTOR CORP
Inventor： YOSHIDA MAKOTO , KOYAMA HARATSUGU , MORIKAWA TAKASHI , SHAMOTO HIROYUKI
Abstract: PURPOSE:To produce a Ti-type member excellent in wear resistance by providing the surface of the part, requiring wear resistance, of a base material consisting of intermetallic compound TiAl with a wear resistant layer prepared by incorporating specific amounts of carbide to the same material as the base material. CONSTITUTION:In a base material essentially consisting of intermetallic compound TiAl, a wear resistant layer consisting of TiAl of the same quality as that of the base material and 2-40wt.% carbide is provided as a surface layer for the part requiring wear resistance. Further, TiC, Cr2C2, Cr2C3, VC, NbC, MoC, W2C, etc., are used as the above carbide, and the wear resistant layer is formed in a padding or alloyed state. By this method, the wear resistant Ti-type member suitable, e.g. for exhaust valve for automobile engine can be obtained.
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公开(公告)号：JPH01208415A
公开(公告)日：1989-08-22
申请号：JP3253088
申请日：1988-02-15
Applicant: TOYOTA MOTOR CORP
Inventor： NAKAGAWA MASAHIRO , KOYAMA HARATSUGU , KANAZAWA TAKAAKI
Abstract: PURPOSE:To improve fatigue strength at desired position of surface of a casting by adding residual stress after rapidly melting and rapidly solidifying the surface layer of the casting. CONSTITUTION:In the casting 1 of Al alloy, cast iron, spheroidal graphite cast iron, etc., by impressing high density heating energy 2 of TIG arc, laser beam, etc., the surface layer is rapidly melted and rapidly cooled and solidified. The surface of this re-solidified layer 4 is finished to the smooth surface 5 with cutting machine, etc. Successively, treatment of shot material 6 is injected and collided, etc., is executed and plastic flowing is developed on the most outer surface layer 4A of the re-solidified layer 4, to execute work hardening to there and the residual compression stress is given to the layer 4B at inside thereof. By this method, the service life of the casting parts, such as applying big repeated bending load can be extended.
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公开(公告)号：JPH01191758A
公开(公告)日：1989-08-01
申请号：JP1771088
申请日：1988-01-28
Applicant: TOYOTA MOTOR CORP
Inventor： OISHI SHINJI , NAKAGAWA MASAHIRO , KOYAMA HARATSUGU
Abstract: PURPOSE:To form the build-up weld zone having excellent wear resistance in the wide temp. range even if subjected to build-up welding by the heat source of high energy density in the title alloy by using a Co-based alloy having the specific compsn. contg. Cr, W, Ni, etc., as the alloy for build-up welding such as a valve of an internal combustion engine. CONSTITUTION:At the time of subjecting the valve, etc., of an internal combustion engine to build-up welding by plasma welding, laser welding, etc., in the use of the heat source having high energy density, the Co-based alloy for build-up welding consisting of, by weight, 1.5-2.0% C, 0.9-1.3% Si,
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Patent Agency Ranking
公开(公告)号：JPH01162782A
公开(公告)日：1989-06-27
申请号：JP32194487
申请日：1987-12-19
Applicant: TOYOTA MOTOR CORP
Inventor： KANAZAWA TAKAAKI , NAKAGAWA MASAHIRO , KOYAMA HARATSUGU
Abstract: PURPOSE:To produce the title Al-based sliding member having excellent resistance to wear and seizing, etc., by alloying Sn on the surface of an Al alloy base metal, and forming a layer of the Al-Sn alloy having a specified content of Sn. CONSTITUTION:An Sn coating layer is formed by thermal spraying, plating, etc., on the surface of the region of an Al alloy base metal where wear resistance is required. High-density energy such as a laser beam is then impressed on the Sn on the Al alloy base metal to rapidly melt the Sn and the base metal surface, hence the Al and Sn are fused together, and the layer of an Al-Sn alloy contg. 5-30wt.% Sn is obtained. By this method, an Al-based sliding member having excellent resistance to wear and seizing is obtained, and utilized as automobile parts, etc.
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公开(公告)号：JPH01111886A
公开(公告)日：1989-04-28
申请号：JP26776787
申请日：1987-10-23
Applicant: TOYOTA MOTOR CORP
Inventor： KOYAMA HARATSUGU , NAKAGAWA MASAHIRO , KANAZAWA TAKAAKI
Abstract: PURPOSE:To decrease the alloy element content in the surface layer of a casting to be formed with a plating layer so that the excellent plating layer having good adhesiveness and less defects such as pinholes can be formed by previously alloying pure Al, etc., to the surface of the above-mentioned casting by high- density heating energy. CONSTITUTION:The pure Al or the Al alloy contg. the Al at the ratio higher than in the Al alloy casting 1 is disposed as the alloying material 2 on the surface 1A in the plating layer forming part of the casting 1 by thermal spraying, etc., and the high-density heating energy 3 such as electron beam is impressed thereto from above to simultaneously melt the material 2 and the surface 1A on the lower side thereof. A molten pool 4 is rapidly solidified by the movement of the position where the energy 3 is impressed. The alloyed layer 5 which is decreased in the alloy element content, i.e., crystallized matter, etc., is fined in the crystallized matter and has the decreased casting defects is thus formed. The excellent plating layer having the good adhesiveness and the decreased defects is thereby formed.
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公开(公告)号：JPS63310976A
公开(公告)日：1988-12-19
申请号：JP14481287
申请日：1987-06-10
Applicant: TOYOTA MOTOR CORP
Inventor： YOSHIDA MAKOTO , KOYAMA HARATSUGU , KANAZAWA TAKAAKI
Abstract: PURPOSE:To form an alloyed layer having uniform characteristics by reciprocating high-density energy to uniformly melt the whole alloyed layer forming region when an alloying material is arranged on the surface of a metallic substrate, high-density energy is exerted to melt both substrate and material, and the alloyed layer having excellent characteristics is formed. CONSTITUTION:The powder 2 of an alloying material such as Cr is coated on the surface of a metallic substrate 1 over the length (l) of >=10mm with the aid of polyvinyl alcohol, etc. High-density energy of a TIG arc 4, etc., is impressed from the upper part by a TIG torch 3 to simultaneously melt the substrate metal 1 and the alloying material 2, hence a melt pool 5 is formed, the TIG4 arc is then removed to quench and solidify the metals, and the surface characteristics such as wear resistance and fatigue resistance are improved. In this case, the torch 3 is repeatedly reciprocated in the surface treating range (l) to keep the whole melt pool 5 n a molten state, hence an alloy having a uniform composition is formed in the surface treatment range (l), and an alloyed layer 6 without variance in the surface characteristics such as wear resistance and fatigue resistance is formed.
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公开(公告)号：JPS63183161A
公开(公告)日：1988-07-28
申请号：JP1380987
申请日：1987-01-23
Applicant: TOYOTA MOTOR CORP
Inventor： KOYAMA HARATSUGU , MIYAKE JOJI , OISHI SHINJI
Abstract: PURPOSE:To freely change the mixing and compounding ratio between dissimilar materials, by constituting a wire for thermal spraying of a stranded wire consisting of >=3 element wires and also by constituting the above element wires of a combination of >=2 kinds of dissimilar materials. CONSTITUTION:For example, a thermal spraying wire 1 is formed as a stranded wire by using, as element wires, three pieces of stainless steel wire 2 of about 0.9mm diameter, e.g., SUS316 by JIS, and four pieces of copper wire 3 of pure copper, etc., The outside diameter of the thermal spraying wire 1 is regulated to about 2.7mm. When this thermal spraying wire 1 is thermally sprayed on the surface of a steel sheet 4 as a base material, e.g., S45C by JIS, by an arc thermal spraying method, a mixed and compounded thermally sprayed layer in which respective thermally sprayed and laminated grains 2a and 3a of the above stainless steel wire 2 and copper wire 3 are laminated in a ratio of 3 to 4 can be formed. Accordingly, by changing respective numbers of the stainless steel wire 2 and the copper wire 3, the mixing and compounding ratio between both can be changed.
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公开(公告)号：JPS63130712A
公开(公告)日：1988-06-02
申请号：JP27630286
申请日：1986-11-19
Applicant: TOYOTA MOTOR CORP
Inventor： KANAZAWA TAKAAKI , MIYAKE JOJI , KOYAMA HARATSUGU , SHIMODA KENJI , OISHI SHINJI
Abstract: PURPOSE:To form remelted chilling-treated layer without any bead crack by impressing high density energy on the surface layer of cast iron and removing the locally graphite crystallized part near the surface after chilling by rapidly solidifying the generated melted layer. CONSTITUTION:The high density energy 2 is impressed on at least a part of the cast iron member 1 by high density energy source 4, such as TIG arc, laser, etc., to melt, and in succession, the generated molten layer 3 is rapidly solidified by thermal conducting to the base material side. Then, the above high energy source 4 is reciprocately shifted and is heated so as to increase holding heat in the base material by treating for a somewhat longer time. In this way, the cooling and solidifying velocities in the molten layer 3 near the part of base material are quick, to form the chilled layer 5B. On the other hand, the cooling and solidifying velocities in the surface layer near the central part become slow and graphite is crystallized near the surface in the solidifying process. The solidified layer 5 composed of graphite crystal layer 5A and the chilled layer 5B formed in this way is machined and the above graphite crystal layer 5A is removed, to form the finishing face 6 having good chilled layer 5B surface.
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