EP3856969A1 - A method for attaching a metal bearing housing to a plastic structure - Google Patents

A method for attaching a metal bearing housing to a plastic structure

Info

Publication number
EP3856969A1
EP3856969A1 EP19761834.1A EP19761834A EP3856969A1 EP 3856969 A1 EP3856969 A1 EP 3856969A1 EP 19761834 A EP19761834 A EP 19761834A EP 3856969 A1 EP3856969 A1 EP 3856969A1
Authority
EP
European Patent Office
Prior art keywords
bearing housing
metal bearing
pores
production method
laser
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP19761834.1A
Other languages
German (de)
French (fr)
Inventor
Anaguli ABULIZI
Erdal PILAV
Yusuf YUSUFOGLU
Mustafa SEZER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Arcelik AS
Original Assignee
Arcelik AS
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 Arcelik AS filed Critical Arcelik AS
Publication of EP3856969A1 publication Critical patent/EP3856969A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/3568—Modifying rugosity
    • B23K26/3584—Increasing rugosity, i.e. roughening
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/08—Devices involving relative movement between laser beam and workpiece
    • B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
    • B23K26/0821—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head using multifaceted mirrors, e.g. polygonal mirror
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/261—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements
    • D06F37/262—Tubs made by a specially selected manufacturing process or characterised by their assembly from elements made of plastic material, e.g. by injection moulding

Definitions

  • the present invention relates to a method for attaching a metal bearing housing to a plastic structure and to the use of this method in white goods.
  • the tub used in washing machines and surrounding the drum is in the form of a cylindrical tank produced from plastic.
  • the tub comprises a metal bearing housing having a hub which receives a drive shaft for driving the drum, and this housing is integrated into the plastic composite in one of the rear walls wherein the ribs (arches) and reinforcing contour arcs are provided.
  • a single piece metal bearing housing is placed into the injection mold.
  • the metal bearing housing is positioned so as to be almost completely embedded into the material of the rear wall surface, and is surrounded by a specially-reinforced polypropylene composite plastic in the mold by injection molding.
  • this method causes significant structural strains in the tub. This is caused by the fact that plastic narrows down while cooling down from the hardening temperature to the room temperature. That different materials together are subject to such high forces may cause deformations on the tub component surrounding the bearing housing. This adversely affects the homogeneity of the tub and may cause microcracks at the points where the stress is the highest. Elongations which occurs after the cracks cause dislocations between the metal bearing housing and the plastic hub and even cause the plastic material surrounding the housing to lose its function, thus significantly decreasing the working life of the tub.
  • a bearing hub which is made of metal material for a washing machine, intended to support a rotating shaft of a drum, having a double truncated-cone shape oriented along its shaft (X) and characterized in that it has at least one outer surface with an eccentricity. Said eccentricity prevents relative rotational movement between the bearing hub and the plastic tub.
  • the bearing hub of said invention is claimed to have a fundamentally flat outer surface. Secondly, it is characterized in that the eccentricity is elliptical or pyramidal at the center. Thirdly, the bearing hub has very smooth edges at its external surfaces. Moreover, the bearing hub is of zamak alloy.
  • a composite material comprising a metal layer formed on a plastic layer.
  • the metal layer comprises pores wherein an adhesive is injected.
  • the plastic layer is molded onto the metal layer by injection so as to contact the adhesive in the pores. Thus, the plastic layer is bound to the metal layer.
  • the aim of the present invention is the realization of a metal bearing housing comprising a hub receiving a drive shaft for driving the drum such that the connection between the bearing housing and the tub has high structural strength.
  • pores are formed on the metal housing by laser scanning and microcutting at micro scale.
  • This coupling method is used in drums and tubs of laundry washing machines and laundry drying machines.
  • Figure 1 is the representative view of the method of the present invention.
  • Figure 2 is the views of the metal surface obtained with the method of the present invention after different numbers of laser pulses.
  • Figure 3 is the comparison chart of the maximum force / maximum stress.
  • the method of the present invention is characterized by comprising the steps of
  • a 2 kW single-mode fiber laser with high linear scanning rate is used.
  • a combination of a 2 kW single-mode fiber laser with high linear scanning rate with a polygon and a galvanometric scanner is used.
  • the distance between the pores is 300 ⁇ m.
  • the smallest distance between the pores can be 150-200 ⁇ m.
  • the lower end of the pores the underside of which are carved is equal to or larger than the surface opening which may create an interruption effect.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)

Abstract

The present invention relates to a method for attaching a metal bearing housing to a plastic structure and to the use of this method in white goods.

Description

    [Title established by the ISA under Rule 37.2] A METHOD FOR ATTACHING A METAL BEARING HOUSING TO A PLASTIC STRUCTURE
  • The present invention relates to a method for attaching a metal bearing housing to a plastic structure and to the use of this method in white goods.
  • The tub used in washing machines and surrounding the drum is in the form of a cylindrical tank produced from plastic. The tub comprises a metal bearing housing having a hub which receives a drive shaft for driving the drum, and this housing is integrated into the plastic composite in one of the rear walls wherein the ribs (arches) and reinforcing contour arcs are provided.
  • In the main method used here, a single piece metal bearing housing is placed into the injection mold. Specifically, the metal bearing housing is positioned so as to be almost completely embedded into the material of the rear wall surface, and is surrounded by a specially-reinforced polypropylene composite plastic in the mold by injection molding. However, this method causes significant structural strains in the tub. This is caused by the fact that plastic narrows down while cooling down from the hardening temperature to the room temperature. That different materials together are subject to such high forces may cause deformations on the tub component surrounding the bearing housing. This adversely affects the homogeneity of the tub and may cause microcracks at the points where the stress is the highest. Elongations which occurs after the cracks cause dislocations between the metal bearing housing and the plastic hub and even cause the plastic material surrounding the housing to lose its function, thus significantly decreasing the working life of the tub.
  • In the state of the art European Patent Application No. EP 2 460 923 A2, a bearing hub is disclosed, which is made of metal material for a washing machine, intended to support a rotating shaft of a drum, having a double truncated-cone shape oriented along its shaft (X) and characterized in that it has at least one outer surface with an eccentricity. Said eccentricity prevents relative rotational movement between the bearing hub and the plastic tub.
  • The bearing hub of said invention is claimed to have a fundamentally flat outer surface. Secondly, it is characterized in that the eccentricity is elliptical or pyramidal at the center. Thirdly, the bearing hub has very smooth edges at its external surfaces. Moreover, the bearing hub is of zamak alloy.
  • In the state of the art American Patent Application No. US 2017/094824 A1, a composite material is disclosed, comprising a metal layer formed on a plastic layer. The metal layer comprises pores wherein an adhesive is injected. The plastic layer is molded onto the metal layer by injection so as to contact the adhesive in the pores. Thus, the plastic layer is bound to the metal layer.
  • The aim of the present invention is the realization of a metal bearing housing comprising a hub receiving a drive shaft for driving the drum such that the connection between the bearing housing and the tub has high structural strength.
  • In the method used in order to attain the aim of the present invention, pores are formed on the metal housing by laser scanning and microcutting at micro scale.
  • This coupling method is used in drums and tubs of laundry washing machines and laundry drying machines.
  • The method realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
    Figure 1 is the representative view of the method of the present invention.
    Figure 2 is the views of the metal surface obtained with the method of the present invention after different numbers of laser pulses.
    Figure 3 is the comparison chart of the maximum force / maximum stress.
  • The elements in the figures are numbered as follows:
    1. Metal bearing housing surface
    2. Laser beam
    3. Pore
  • In order to form pores on the metal bearing housing surface by laser scanning and microcutting at micro scale, the method of the present invention is characterized by comprising the steps of
    • determining the suitable microcutting parameters (variable laser power, scanning rate, number of pulses, distance between pores) by examining the metal bearing housing, and
    • forming pores on the metal bearing housing surface by microcutting with laser pulses at micro scale according to the determined parameters.
  • At the step of coupling the metal bearing housing, which receives the drive shaft driving the drum, with the plastic tub surround the drum of white goods such as laundry washing machine, laundry drying machine, etc., in order to decrease stresses which may cause microcracks on the tub, pores are formed on the metal bearing housing surface by laser scanning and microcutting at micro scale.
  • Since at the maximum stress (34.02 N/mm²) of the plastic tub, there is no dislocation between the plastic (washing machine tub) and the cast iron (bearing housing) before fracture, a very efficient contact adhesive strength is obtained (Figure 3).
  • In the preferred embodiment of the present invention, a 2 kW single-mode fiber laser with high linear scanning rate is used.
  • In the preferred embodiment of the present invention, a combination of a 2 kW single-mode fiber laser with high linear scanning rate with a polygon and a galvanometric scanner is used.
  • In the preferred embodiment of the present invention, the single-mode fiber laser has the values of P=2000 W, V=25 m/s, SD=300 μm.
  • In the preferred embodiment of the present invention, the distance between the pores is 300 µm.
  • In an embodiment of the present invention, the smallest distance between the pores can be 150-200 µm.
  • In the preferred embodiment of the present invention, the lower end of the pores the underside of which are carved is equal to or larger than the surface opening which may create an interruption effect.

Claims (9)

  1. A method, in order to form pores on the metal bearing housing surface by laser scanning and microcutting at micro scale, characterized by comprising the steps of
    - determining the suitable microcutting parameters (variable laser power, scanning rate, number of pulses, distance between pores) by examining the metal bearing housing,
    - forming pores on the metal bearing housing surface by microcutting with laser pulses at micro scale according to the determined parameters.
  2. A white good characterized by comprising a metal bearing housing obtained by a method as in Claim 1.
  3. A laundry washing machine characterized by comprising a metal bearing housing obtained by a method as in Claim 1.
  4. A laundry drying machine characterized by comprising a metal bearing housing obtained by a method as in Claim 1.
  5. A production method as in Claim 1, characterized in that a 2 kW single-mode fiber laser with high linear scanning rate is used.
  6. A production method as in Claim 1, characterized in that a combination of a 2 kW single-mode fiber laser with high linear scanning rate with a polygon and a galvanometric scanner is used.
  7. A production method as in Claim 1, characterized in that a single-mode fiber laser with the values of P=2000 W, V=25 m/s, SD=300 μm is used.
  8. A production method as in Claim 1, characterized in that the distance between pores is 300 µm.
  9. A production method as in Claim 1, characterized in that the smallest distance between pores is 150-200 µm.
EP19761834.1A 2018-09-28 2019-08-29 A method for attaching a metal bearing housing to a plastic structure Withdrawn EP3856969A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201814162 2018-09-28
PCT/EP2019/073035 WO2020064258A1 (en) 2018-09-28 2019-08-29 A method for attaching a metal bearing housing to a plastic structure

Publications (1)

Publication Number Publication Date
EP3856969A1 true EP3856969A1 (en) 2021-08-04

Family

ID=67809481

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19761834.1A Withdrawn EP3856969A1 (en) 2018-09-28 2019-08-29 A method for attaching a metal bearing housing to a plastic structure

Country Status (2)

Country Link
EP (1) EP3856969A1 (en)
WO (1) WO2020064258A1 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8962151B2 (en) * 2006-08-15 2015-02-24 Integrated Micro Sensors, Inc. Method of bonding solid materials
ES2393097B1 (en) 2010-12-06 2013-11-22 BSH Electrodomésticos España S.A. Bearing hub for washing machine.
US10688624B2 (en) 2015-09-30 2020-06-23 Apple Inc. Electronic device structure formed from porous metal bonded to plastic
WO2017155491A1 (en) * 2016-03-09 2017-09-14 Lang Yuzer Otomotiv Yan San. Ve Tic. A. S. A roller bearing for a washing machine comprising a front loading rotary drum and production method thereof
DE102016104543B4 (en) * 2016-03-11 2021-08-12 Gehring Technologies Gmbh + Co. Kg Devices and methods for structuring bearing bores in a storage aisle
GB2551241B (en) * 2016-03-31 2019-04-17 Porsche Ag Method for machining a surface of a metal component

Also Published As

Publication number Publication date
WO2020064258A1 (en) 2020-04-02

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