公开(公告)号：JPH0270072A

公开(公告)日：1990-03-08

申请号：JP22009988

申请日：1988-09-02

Applicant: TOYOTA MOTOR CORP

Inventor： KOYAMA HARATSUGU ,  NAKAGAWA MASAHIRO ,  YOSHIDA MAKOTO ,  KADOTA YUKIO ,  SHAMOTO HIROYUKI

IPC: C23C26/00 ,  C22C14/00 ,  C22C21/00 ,  C23C14/16

Abstract: PURPOSE:To obtain a wear resistant member having superior wear resistance of the prescribed parts by alloying the surfaces of the prescribed parts of a Ti alloy member with Al to form wear resistant layers contg. a Ti-Al intermetallic compd. and having a specified concn. of Al. CONSTITUTION:The base material 1 of a valve body is made of a Ti alloy such as Ti-6Al-4V and the surfaces of the parts of the base material 1 requiring wear resistance, e.g., the valve face part 2 and the shaft end part 3 are alloyed with Al. This alloying can be carried out by uniformly spreading pure Al powder on the prescribed parts and irradiating the surfaces of the resulting Al powder layers with laser light to simultaneously melt the Al powder layers and the surface of the base material under the layers. Wear resistant layers contg. a Ti-Al intermetallic compd. are formed and a Ti alloy base material 1 having superior wear resistance is obtd. The concn. of al in the wear resistant layers is regulated to 15-60wt.%.

公开(公告)号：JPH0247278A

公开(公告)日：1990-02-16

申请号：JP19752288

申请日：1988-08-08

Applicant: TOYOTA MOTOR CORP

Inventor： KOYAMA HARATSUGU ,  KADOTA YUKIO ,  SHAMOTO HIROYUKI ,  NAKAGAWA MASAHIRO ,  YOSHIDA MAKOTO

IPC: C23C30/00

Abstract: PURPOSE:To render superior wear resistance to a base material made of TiAl as an intermetallic compd. by forming wear resistant layer consisting of TiAl3- based Ti-Al intermetallic compds. as the surface layers of the parts of the base material requiring wear resistance. CONSTITUTION:A base material 1 forming the body of a member such as a valve of an automotive engine is made of TiAl as an intermetallic compd. Wear resistant layer 4 having about 48-63wt.% Al concn., consisting of TiAl3- based Ti-Al intermetallic compds. and contg. a practically crystallized pure Al phase are formed as the surface layers of the valve face part 2 and the shaft end part 3 of the base material 1 requiring wear resistance. A base material 1 having superior durability is obtd.

公开(公告)号：JPS62167846A

公开(公告)日：1987-07-24

申请号：JP855486

申请日：1986-01-18

Applicant: TOYOTA MOTOR CORP

Inventor： KOYAMA HARATSUGU ,  MIYAKE JOJI ,  KANAZAWA TAKAAKI

IPC: C21D9/00 ,  B23K26/352 ,  C21D5/00 ,  C22C37/00 ,  C22C37/04 ,  F02F3/00

Abstract: PURPOSE:To obtain the titled piston which has no possibility of having cracks in the part where the resistance to thermal impact and thermal fatigue is required in the piston head part of said piston by partially reinforcing the sur face layer of said part to specific structure. CONSTITUTION:The part where the temp. is made highest by the direct receipt of fuel injection and particularly the resistance to thermal impact and thermal fatigue is required in the head part 2 of the piston 1, for example, a hot spot part 4, is partially reinforced. More specifically, a fine graphite dispersed layer which consists of a ferrite phase as the matrix and in which finely lumped graphite of =0.2mm depth from the surface. A rough shape material for the piston is cast of a cast iron for the above-mentioned purpose and there after high-density energy such as laser is irradiated on the surface of the part 4. The irradiated position is moved or the irradiation is stopped to quickly melt and quickly solidify the surface layer, by which a chilled layer is formed. After the layer 11 is hated for 1min-3hr at 800-110 deg.C, the layer is cooled at a rate of

公开(公告)号：JPS62112706A

公开(公告)日：1987-05-23

申请号：JP25335985

申请日：1985-11-12

Applicant: TOYOTA MOTOR CORP

Inventor： TERAJIMA YUKIO ,  MIYAKE JOJI ,  FUWA YOSHIO ,  KOYAMA HARATSUGU

IPC: B22F3/24 ,  B22F3/20 ,  B22F5/00 ,  C22C1/04 ,  C22F1/00 ,  C22F1/043

Abstract: PURPOSE:To easily produce a sliding member having excellent wear resistance by subjecting a rough shape material molded of hypereutectic Si-Al alloy powder to a thorough degassing treatment then to hot working and irradiating high density energy to the sliding surface thereof to remelt the surface, then subjecting the molten surface to controlled cooling. CONSTITUTION:The hypereutectic Si-Al alloy powder is preliminarily molded to obtain the rough shape material having a bar, rectangular or other shapes. The above-mentioned rough shape material is subjected to the thorough degassing treatment then to hot working to form the sliding member having the prescribed shape. The high density energy such as TIG arc or laser is irradiated to at least the sliding surface of the resulted sliding member to remelt the surface and the molten surface is cooled at a temp. decreasing rate of 0.1-7.0 deg.C/sec. The sliding surface consisting of the primary crystal silicon having 25-100Xm grain size is thereby formed on the above-mentioned sliding surface down to the depth of >=0.1mm from the surface. The sliding member made of Al powder metallurgy having the high strength, high toughness and high heat resistance and improved wear resistance is thus obtd.

公开(公告)号：JPS6287654A

公开(公告)日：1987-04-22

申请号：JP22806785

申请日：1985-10-14

Applicant: TOYOTA MOTOR CORP

Inventor： KOYAMA HARATSUGU ,  MIYAKE JOJI ,  KANAZAWA TAKAAKI

IPC: B23K26/352 ,  C21D5/00 ,  C22C37/00 ,  C22C37/04 ,  F02B3/06 ,  F02F1/24

Abstract: PURPOSE:To easily manufacture a cylinder head at a low cost while the effect of prevention of cracks is sustained, by forming a fine graphite cast iron layer between valves and between the valves and a chambers. CONSTITUTION:In a roughly formed material of a cylinder head for a Diesel- engine, which is cast by a sand-mold process with the use of a molten material which is obtained by adding cerium as a deoxidizing agent in usual cast iron, inter valve sections between intake valves and exhaust valves and, and inter valve-chamber sections between the intake and exhaust valves and a chamber are subjected to a remelting and chilling process with the use of a TIG torch 8, and as a result, a remelted and chilled layer 9 is formed. Then, a high frequency heating coil 11 is disposed in the vicinity of the outer surface of the inter valve section, etc., to heat the latter before cooling. As a result, a fine graphite cast iron layer 12 which is the base material of the remelted and chilled layer 9 turned into ferrite, is obtained. Then, the cylinder head material is machine for finishing, thereby it is possible to obtain a cylinder head as a final product.

公开(公告)号：JPS61270376A

公开(公告)日：1986-11-29

申请号：JP855286

申请日：1986-01-18

Applicant: TOYOTA MOTOR CORP

Inventor： KANAZAWA TAKAAKI ,  MIYAKE JOJI ,  KOYAMA HARATSUGU

IPC: C23C26/00 ,  B23K26/34 ,  C22C1/00 ,  C22C1/02 ,  C22C1/10 ,  C22C21/00 ,  C23C30/00 ,  F01L3/02

Abstract: PURPOSE:To obtain an Al alloy member having excellent wear resistance by forming the composite phase consisting of an Ni-Al intermetallic compd. phase and hard carbide phase on the surface of an Al alloy base material in a desired part and specifying the concns. of the Ni and hard carbide layer in the composite phase. CONSTITUTION:The mixture composed of 1 or >=2 kinds of the hard carbides selected from TiC, WC, VC, ZrC, NbC and TaC and Ni is thermally sprayed onto the surface of the Al alloy base material in the position where the wear resistance is required to coat said surface. High-density energy such as TIG arc is then irradiated to said surface to heat quickly the surface for a short period and to melt and alloy part of the Ni+hard carbide coating layer and the Al alloy base material on the underside thereof by which the composite phase consisting of the Ni-Al intermetallic compd. phase and the hard carbide phase is crystallized in the Al alloy matrix. The conditions for irradiating the high-density energy are adequately set so that the average concn. of Ni in the composite phase attains 10-20wt% and the average concn. of the hard carbide phase attains 0.5-30wt%.

公开(公告)号：JPS61250182A

公开(公告)日：1986-11-07

申请号：JP9042885

申请日：1985-04-25

Applicant: TOYOTA MOTOR CORP

Inventor： KANAZAWA TAKAAKI ,  MIYAKE JOJI ,  KOYAMA HARATSUGU

IPC: C23C10/28 ,  C23C10/60 ,  C23C26/00

Abstract: PURPOSE:To prevent the corrosion of the surfaces of cast iron parts by formic acid by forming Fe-Ni-Cr solid soln. layers on the surfaces of the cast iron parts by the alloying of Ni and Cr. CONSTITUTION:When a cast iron engine using methanol as fuel is driven, formic acid produced by the combustion of methanol corrodes the engine. In order to prevent the corrosion, the inside of the cylinder bore in the engine is coated with Ni and Cr powders by thermal spraying, PVD or other method, and the powders are melted by means of TIG arc and alloyed with part of the cast iron to form a solid soln. layer of an Fe-Ni-Cr alloy contg. 1-80wt% Ni and 1-20wt% Cr. The solid soln. layer acts as a protective film and prevents the corrosion of the inside of the cast iron cylinder bore by formic acid.

公开(公告)号：JPS61195918A

公开(公告)日：1986-08-30

申请号：JP3605485

申请日：1985-02-25

Applicant: TOYOTA MOTOR CORP

Inventor： KOYAMA HARATSUGU ,  MIYAKE JOJI ,  KANAZAWA TAKAAKI

IPC: C21D5/00 ,  C21D1/09 ,  C23C26/00

Abstract: PURPOSE:To improve the wear resistance of cast iron by putting an alloy contg. Cr, Mo or Ni on part of the surface of the cast iron and by melting the alloy together with part of the base metal so as to form an alloyed and chilled layer on the part of the surface of the cast iron. CONSTITUTION:An alloy contg. one or more among Cr, Mo, Ni, Nb, V and Cu is put on part of the surface of cast iron and melted together with part of the base metal with high density energy as a heating source, and the resulting melts are rapidly cooled. An alloyed and chilled layer is formed at the remelted and solidified part of the base metal.

公开(公告)号：JPS6160290A

公开(公告)日：1986-03-27

申请号：JP18342484

申请日：1984-08-31

Applicant: Toyota Motor Corp

Inventor： KANAZAWA TAKAAKI ,  MIYAKE JOJI ,  TOMOTA TAKASHI ,  KOYAMA HARATSUGU ,  OISHI SHINJI

IPC: B23K26/00 ,  B23K26/06 ,  B23K26/067

CPC classification number: B23K26/067 ,  B23K26/0619

Abstract: PURPOSE:To improve the processing efficiency by providing a laser parting body on the route of a laser beam and irradiating each beam to separate part to be processed. CONSTITUTION:A parting miller 20 with a miller 22 is provided on the route of a laser beam 18 and the laser beam 18 is parted into two laser beams 18a. The parted laser beams 18a are reflected by a reflection miller 24 and irradiated to inner wall surfaces 14, 16. Two part of the wall surfaces 14, 16 are processed by a laser processing device to shorten the processing time and decrease the number of irradiation position alignment. Consequently, the processing efficiency of the laser beam 18 is improved.

Abstract translation: 目的：通过在激光束的路径上提供激光分离体并照射每个光束以分离要处理的部分，从而提高处理效率。 构成：在激光束18的路径上设置有具有铣刀22的分铣机20，激光束18分成两个激光束18a。 分割的激光束18a被反射铣刀24反射并照射到内壁表面14,16上。两个部分的壁表面14,16由激光加工装置处理以缩短处理时间并减少照射位置的数量 对准。 因此，提高了激光束18的处理效率。

公开(公告)号：JPS6153413A

公开(公告)日：1986-03-17

申请号：JP17224684

申请日：1984-08-18

Applicant: Toyota Motor Corp

Inventor： MIYAKE JOJI ,  KOYAMA HARATSUGU ,  KANAZAWA TAKAAKI ,  TOMOTA TAKASHI ,  OISHI SHINJI

IPC: F01L3/02 ,  F01L3/04

CPC classification number: F01L3/04

Abstract: PURPOSE:To reduce cost by forming Fe-Cr system alloy of specified composition on a face surface to ensure the face surface performance equivalent to that of prior stellite by the use of economical material. CONSTITUTION:A valve body 2 is formed on the face base surface 3 with an alloy layer 1 consisting of 10-60wt% of Cr, 1-8wt% of C and total 5-20wt% of one or at least two kinds of Mo, Ni, W, B, Si, Co and the remaining Fe to constitute a face surface 4 with this alloy layer 1. Then, when said alloy 1 is formed, the alloy powder of said composition is welded and blasted onto the face base surface 3, then irradiated by a high density energy medium like laser to alloy portionally the connection to the valve body 2 and ground to be finished to have a predetermined dimension and shape. Thus, antiwear property, heat resisting property and corrosion resistance equivalent to those of prior stellite filling can be ensured by the use of economical materials.

Abstract translation: 目的：通过在表面上形成具有规定组成的Fe-Cr系合金以降低成本，通过使用经济材料确保表面性能与以前的钨铬钴合金相当。 构成：在面基材3上形成有由10-60重量％Cr，1-8重量％C和5-20重量％的一种或至少两种Mo组成的合金层1的阀体2， Ni，W，B，Si，Co和剩余的Fe构成该合金层1的表面4.然后，当形成所述合金1时，将所述组合物的合金粉末焊接并喷射到基面3上 ，然后通过像激光这样的高密度能量介质照射，以便与阀体2的连接和接地被精加工以具有预定的尺寸和形状。 因此，可以通过使用经济的材料来确保抗磨损性，耐热性和耐腐蚀性等同于先前的钨铬合金填充。