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WO1999002283A1 - Tube pour echangeur de chaleur et procede de fabrication dudit tube - Google Patents

Tube pour echangeur de chaleur et procede de fabrication dudit tube Download PDF

Info

Publication number
WO1999002283A1
WO1999002283A1 PCT/JP1998/003059 JP9803059W WO9902283A1 WO 1999002283 A1 WO1999002283 A1 WO 1999002283A1 JP 9803059 W JP9803059 W JP 9803059W WO 9902283 A1 WO9902283 A1 WO 9902283A1
Authority
WO
WIPO (PCT)
Prior art keywords
plate
tube
heat exchanger
bent
bent portion
Prior art date
Application number
PCT/JP1998/003059
Other languages
English (en)
Japanese (ja)
Inventor
Soichi Kato
Muneo Sakurada
Shin Kurihara
Sadao Haiya
Takashi Sugita
Shoji Akiyama
Takahumi Umehara
Original Assignee
Zexel Corporation
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 Zexel Corporation filed Critical Zexel Corporation
Priority to EP98931008A priority Critical patent/EP1027942A4/fr
Publication of WO1999002283A1 publication Critical patent/WO1999002283A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • F28F3/04—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element
    • F28F3/042—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations the means being integral with the element in the form of local deformations of the element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/14—Making tubes from double flat material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/151—Making tubes with multiple passages
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/04—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of sheet metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/02—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers
    • B21D53/08—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal
    • B21D53/085—Making other particular articles heat exchangers or parts thereof, e.g. radiators, condensers fins, headers of both metal tubes and sheet metal with fins places on zig-zag tubes or parallel tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D1/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators
    • F28D1/02—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid
    • F28D1/03—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits
    • F28D1/0391—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, in which the other heat-exchange medium is a large body of fluid, e.g. domestic or motor car radiators with heat-exchange conduits immersed in the body of fluid with plate-like or laminated conduits a single plate being bent to form one or more conduits

Definitions

  • the present invention relates to a heat exchanger tube used for a heat exchanger and a method for producing the same.
  • a plurality of tubes are laminated with a fin interposed therebetween, and each end of these tubes is connected to a header pipe so that a medium is provided at an inlet / outlet joint provided on the header pipe.
  • Heat exchangers are known that are meandered multiple times between them.
  • a band-shaped plate made of a metal such as aluminum light alloy is subjected to roll forming, press working, etc. It is known to attach them.
  • the plate used is a brazed sheet that is clad in full brazing material, and the brazing of the main parts of the tubes and of the other parts of the heat exchanger is After assembling tubes, fins, header pipes, and the like using jigs and the like, the assembly is heated in a lump.
  • the tube 20 shown in FIG. 6 is formed by bending a strip-shaped plate and tying flat joints 22 and 22 provided at ends of the plate in the width direction to each other. Things.
  • the bent portion 21 of the plate is bent at a predetermined curvature corresponding to the thickness of the tube 20, and the joints 22 and 22 correspond to the thickness of the tube 20. It is formed at a predetermined height.
  • the bent portion 21 of the plate In order to improve the pressure resistance and heat exchange property of the tube 20, beads 23 formed by bending the plate in a concave shape are provided at appropriate intervals between the joints 22 and 22. ing. In other words, these beads 23 and 23 have their tops tied to opposing portions inside tube 20, respectively, and these beads 23 and 23 are inside tube 20. A plurality of flow paths 24, 24 partitioned by are formed.
  • the present invention provides a heat exchanger tube with improved fitting performance by bending the plate forming the tube more accurately and easily, and a method of manufacturing the same. It is intended to provide a law. Disclosure of the invention
  • the invention described in claim 1 of the present application is directed to a heat exchanger tube formed by bending a strip-shaped metal plate and joining together joining portions provided at both ends in the width direction of the plate.
  • a heat exchanger tube having a configuration in which a groove extending in a longitudinal direction of the plate is provided in a portion to be bent of the plate.
  • the plate can be bent more accurately and easily, so that the joint can be bent.
  • the attachment efficiency can be improved, and the yield rate of the tubes and the heat exchanger constituted by using the tubes can be improved.
  • the joints when the plate is bent, if the bent portion of the plate is slightly displaced from a predetermined position, the joints may be displaced from each other, which may cause a mounting failure. Since the position of the bent portion of the joint can be regulated, the plate can be bent accurately, and as a result, the joints can be prevented from being displaced from each other, and brazing defects can be reduced. Can be.
  • a bead is placed between the bent portion and the joint of the plate.
  • the plate can be bent accurately and easily in the case where the top of the plate and the inside facing portion are brazed, so that the brazing property at the joint is improved.
  • the brazing property of the bead can be improved.
  • the invention described in claim 2 of the present application is the invention according to claim 1, wherein, before brazing the joining portion, a radius of curvature of the bent portion of the plate is compressed by compressing a vicinity of the bent portion of the plate.
  • This is a heat exchanger tube with a reduced size.
  • the bent portion of the plate can be reduced.
  • the elastic force can be made smaller, and as a result, the weldability at the joint and the bead can be further improved.
  • the shape of the heat exchanger is increased due to the cumulative imbalance in the width direction of each tube. Can be prevented from being distorted.
  • a method for manufacturing a heat exchanger bush comprising bending a strip-shaped metal plate and joining together joints provided at both ends in the width direction of the plate.
  • a method for manufacturing a tube for a heat exchanger wherein a groove extending in a longitudinal direction of the plate is provided in a portion to be bent of the plate.
  • the plate can be bent more accurately and easily, so that it will be at the joint.
  • the attachment efficiency can be improved, and the yield rate of the tubes and the heat exchanger constituted by using the tubes can be improved.
  • the joints may be displaced from each other, which may cause a mounting failure. Since the position of the bent portion of the joint can be regulated, the plate can be bent accurately, and as a result, the joints can be prevented from being displaced from each other, and brazing defects can be reduced. Can be.
  • the plate when the top of the bead and the inside facing portion are brazed between the bent portion and the joint portion of the plate, the plate can be bent accurately and easily in this manner. Therefore, the brazing property at the joint portion can be improved, and the brazing property at the bead can be improved.
  • the invention described in claim 4 of the present application is the invention according to claim 3, wherein, before brazing the joint portion, the vicinity of the bent portion of the plate is compressed to obtain a radius of curvature of the bent portion of the plate. This is a method for manufacturing a heat exchanger tube having a configuration that reduces the size of the heat exchanger tube.
  • the bent portion of the plate can be reduced.
  • the elastic force can be made smaller, and as a result, the weldability at the joint and the bead can be further improved.
  • the shape of the heat exchanger is distorted due to the accumulation of strong imbalance in the width direction of each tube. Can be prevented.
  • FIG. 2 is a front view showing a heat exchanger according to a specific example of the present invention.
  • FIG. 1 is an external view showing a heat exchanger tube according to a specific example of the present invention.
  • FIG. 2 is an external view showing bending of a plate according to a specific example of the present invention.
  • FIG. 2 is an external view showing a plate according to a specific example of the present invention.
  • FIG. 1 is an external view showing a heat exchanger tube according to a specific example of the present invention.
  • FIG. 4 is an external view showing a joint and a bead when a plate is bent according to a conventional example.
  • the heat exchanger 1 of this example is provided with a plurality of tubes 2 and 2 stacked with the fins 5 and 5 interposed therebetween and at both ends of the tubes 2 and 2.
  • the header pipes 3 and 4 are connected for communication.
  • the header pipes 3 and 4 have upper and lower end openings closed by blind caps 6 and 6, and the interior is partitioned by partition plates 7 and 7 arranged at predetermined locations.
  • Fitting 3a or medium It is a circular tube provided with an outlet joint 4a for discharging to the outside.
  • Tube holes 9, 9 are formed at predetermined intervals in the longitudinal direction of each header pipe 3, 4.
  • Each tube 2 is provided with its end inserted into the tube hole 9 and brazed.
  • the side plates 8 are arranged above and below the tubes 2 and 2 layers. The end of the side plate 8 is fixed to each of the header pipes 3 and 4 to reinforce the structural strength of the heat exchanger.
  • the medium taken in from the inlet joint 3a is meandered a plurality of times so as to reciprocate the header pipes 3 and 4 in units of two groups of predetermined tubes, and the tubes are exchanged while exchanging heat. 2 and is discharged from outlet joint 4a.
  • the heat exchange of the medium is promoted by the heat radiation effect of the fin 5 interposed between the tube 2 and the side plate 8.
  • FIG. 2 is an external view showing the tube 2
  • FIGS. 3 and 4 are external views showing a plate P forming the tube 2.
  • the tube 2 of this example is obtained by bending a band-shaped plate P and joining the joints 22 and 22 provided at the ends in the width direction of the plate P to each other. It is configured with brazing.
  • the cross-sectional shape of the tube 2 is set slightly smaller than the tube holes 9 and 9 of the header pipes 3 and 4.
  • the bent portion 21 of the plate P is provided with a groove 2 la extending in the longitudinal direction of the plate P.
  • the plate P is formed in the thickness of the tube 2 around the groove 21 a. It is bent at the corresponding predetermined curvature.
  • the to-be-bent portion 21 'of the plate P is made to be the to-bend portion 21 of the plate P.
  • a plurality of beads 23, 23 are provided at appropriate intervals between the bent part 21 of the plate P and the joint parts 22, 22, and these beads are provided inside the tube 2. Multiple sections partitioned by one Channels 24 and 24 are formed.
  • the plate P is made of an aluminum light alloy having excellent formability as a raw material, and the front and back surfaces of the plate are clad.
  • the joints 22 and 22 and the beads 23 and 23 are formed by bending the plate P by roll forming.
  • This roll forming process is performed by passing the plate P between rotating rolls of a predetermined shape arranged to face each other.
  • the groove 21a is formed by extending the central surface in the width direction of the plate P inside the tube 2 to the longitudinal direction of the plate P. Along the direction, it is provided by pressing with a roll having a peripheral edge of a groove 2 la shape.
  • the cross section of the groove 2 la is V-shaped, and its depth is set to 12 or less with respect to the thickness of the tube 2. That is, by appropriately setting the shape and depth of the groove 2 la, it is possible to suppress the weakening of the tube 2, which is caused by reducing the thickness of the plate P, and to reduce the thickness. We are trying to ensure sufficient strength.
  • the tube 2 is formed by bending the plate P provided with the joints 22 and 22, the beads 23 and 23, and the groove 2 la by roll forming as described above. It is formed by That is, the tube 2 is formed by bending the plate P starting from the groove 2 la so that the joints 22 and 22 abut each other and the top of the beads 23 and 23. Are formed in contact with the opposed portions. At this time, since the groove 2 la is provided, the plate P can be bent accurately and easily.
  • the tube 2 thus formed is assembled integrally with the header pipes 3 and 4 and the fins 5 and 5, and the assembled body is fed into a furnace for heat treatment. Attached. That is, the joints 22 and 22 and the tops of the beads 23 and 23 and The parts are attached together with the tube holes 9 and 9 of the header pipes 3 and 4 and the main parts in contact with the fins 5 and 5.
  • the groove 21a is provided so as to be inside the tube 2 in this example. However, the groove 21a is located outside the tube 2 at a point where the plate P is bent. May be provided.
  • the cross-sectional shape is not limited to the V-shape, but may be a U-shape.
  • the plate can be bent more accurately and easily, so that it will be at the joint.
  • the attachment efficiency can be improved, and the yield of the tubes and the heat exchanger constituted by using the tubes can be improved.
  • the joints when the plate is bent, if the bent portion of the plate is slightly displaced from a predetermined position, the joints may be displaced from each other, which may cause a mounting failure. Since the position of the bent portion of the joint can be regulated, the plate can be bent accurately, and as a result, the joints can be prevented from being displaced from each other, and brazing defects can be reduced. Can be.
  • the tube of this example is provided with a bead portion alternately from the upper and lower walls, and in the plate before molding, the tube is formed in an asymmetrical shape with the bent portion as the center. Due to the provision of the groove, it is possible to avoid poor molding of the bent portion due to the above.
  • a gap may be formed between the joints, which may cause poor attachment.
  • the thickness of the bent portion of the plate is reduced by such a groove. Since the elastic force is reduced, the plate can be easily bent, and as a result, the joints are prevented from being separated from each other, and the brazing is not sufficiently performed between them. The formation of a gap can be prevented beforehand, and brazing defects can be reduced.
  • the plate can be bent accurately and easily in this manner. Therefore, the brazing property at the joint portion can be improved and the brazing property at the bead can be improved.
  • FIG. 5 Next, another specific example of the present invention shown in FIG. 5 will be described.
  • the tube 2 of the present example compresses the vicinity of the bent portion 21 of the plate before brazing the joints 22 to reduce the radius of curvature of the bent portion 21 of the plate. It is a smaller one. That is, in the vicinity of the bent portion 21 of the plate, there are formed compressed portions 25 and 25 having a tapered cross-sectional shape. These compression sections 25, 25 are formed by roll forming. In addition, other configurations are the same as those in the above-described specific example, and thus description thereof is omitted.
  • the bent portion of the plate can be reduced.
  • the elastic force can be made smaller, and as a result, the weldability at the joint and the bead can be further improved.
  • the shape of the heat exchanger is distorted due to the accumulation of a strong imbalance in the width direction of each tube. Prevent can do.
  • the present invention proposes a tube and a method for manufacturing the tube, in which the plate forming the tube is bent accurately and easily to improve the fitting property. Therefore, the present invention is applied to a general radiator evaporator and a capacitor required to withstand voltage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)

Abstract

Tube pour échangeur de chaleur, dans lequel une plaque métallique (P) en forme de bande est pliée. Des parties de jonction (22) situées aux deux extrémités de la plaque (P) dans le sens de la largeur sont brasées l'une à l'autre. Ledit tube possède une rainure (21a) qui s'étend longitudinalement sur la plaque (P) et qui est ménagée sur une partie (21') au niveau de laquelle la plaque est pliée. Par conséquent, il est possible de plier la plaque facilement et de manière correcte, ce qui améliore la performance du brasage.
PCT/JP1998/003059 1997-07-09 1998-07-08 Tube pour echangeur de chaleur et procede de fabrication dudit tube WO1999002283A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP98931008A EP1027942A4 (fr) 1997-07-09 1998-07-08 Tube pour echangeur de chaleur et procede de fabrication dudit tube

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP18421797A JPH1130493A (ja) 1997-07-09 1997-07-09 熱交換器用チューブ及びその製造方法
JP9/184217 1997-07-09

Publications (1)

Publication Number Publication Date
WO1999002283A1 true WO1999002283A1 (fr) 1999-01-21

Family

ID=16149423

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1998/003059 WO1999002283A1 (fr) 1997-07-09 1998-07-08 Tube pour echangeur de chaleur et procede de fabrication dudit tube

Country Status (3)

Country Link
EP (1) EP1027942A4 (fr)
JP (1) JPH1130493A (fr)
WO (1) WO1999002283A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1074807A3 (fr) * 1999-08-02 2001-04-11 Ford Motor Company Tube plié pour échangeur de chaleur et sa méthode de fabrication
EP1106949A1 (fr) * 1999-12-10 2001-06-13 Visteon Global Technologies, Inc. Tube plié pour un échangeur de chaleur et sa méthode de fabrication
CN109230946A (zh) * 2018-11-02 2019-01-18 宁波欧菱电梯配件有限公司 一种电梯门导轨及导轨加工方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3299148B2 (ja) * 1997-09-16 2002-07-08 株式会社ゼクセルヴァレオクライメートコントロール 熱交換器用チューブとその製造方法
DE20303139U1 (de) * 2003-02-27 2003-06-18 Behr GmbH & Co. KG, 70469 Stuttgart Vorrichtung zur Wärmeübertragung
FR2969018B1 (fr) * 2010-12-20 2012-12-21 Valeo Systemes Thermiques Procede de brasage pour echangeur thermique, tube et echangeur thermique correspondants
FR2986313A1 (fr) * 2012-01-31 2013-08-02 Valeo Systemes Thermiques Tube d'echangeur thermique, echangeur thermique et procede d'obtention correspondant
JP2018087660A (ja) * 2016-11-29 2018-06-07 株式会社デンソー ドロンカップ式熱交換器

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51149862A (en) * 1975-06-19 1976-12-23 Mitsubishi Aluminium Method of producing multiiconduit pipe for heat exchanger
JPS6328631U (fr) * 1986-08-08 1988-02-25
JPH0842985A (ja) * 1994-07-29 1996-02-16 Showa Alum Corp 熱交換器用冷媒流通管

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DE3704215C2 (de) * 1987-02-11 1995-11-30 Laengerer & Reich Kuehler Strangpreßprofilrohr für Wärmeaustauscher
US5186250A (en) * 1990-05-11 1993-02-16 Showa Aluminum Kabushiki Kaisha Tube for heat exchangers and a method for manufacturing the tube
US5172476A (en) * 1991-08-14 1992-12-22 General Motors Corporation Method of manufacturing heat exchanger tubing
JP3146442B2 (ja) * 1992-11-27 2001-03-19 株式会社ゼクセルヴァレオクライメートコントロール 熱交換器用チューブおよびその製造方法
JPH07100528A (ja) * 1993-10-05 1995-04-18 Nisshin Steel Co Ltd 形状特性に優れた異形管の製造方法
JP3346951B2 (ja) * 1995-06-02 2002-11-18 カルソニックカンセイ株式会社 熱交換器用チューブ
JP2688037B2 (ja) * 1996-05-07 1997-12-08 カルソニック株式会社 アルミニウム製熱交換器及びその製造方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51149862A (en) * 1975-06-19 1976-12-23 Mitsubishi Aluminium Method of producing multiiconduit pipe for heat exchanger
JPS6328631U (fr) * 1986-08-08 1988-02-25
JPH0842985A (ja) * 1994-07-29 1996-02-16 Showa Alum Corp 熱交換器用冷媒流通管

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1027942A4 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1074807A3 (fr) * 1999-08-02 2001-04-11 Ford Motor Company Tube plié pour échangeur de chaleur et sa méthode de fabrication
EP1106949A1 (fr) * 1999-12-10 2001-06-13 Visteon Global Technologies, Inc. Tube plié pour un échangeur de chaleur et sa méthode de fabrication
CN109230946A (zh) * 2018-11-02 2019-01-18 宁波欧菱电梯配件有限公司 一种电梯门导轨及导轨加工方法

Also Published As

Publication number Publication date
EP1027942A4 (fr) 2001-05-16
EP1027942A1 (fr) 2000-08-16
JPH1130493A (ja) 1999-02-02

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