[go: up one dir, main page]

WO1997039466A1 - Declics bimetalliques - Google Patents

Declics bimetalliques Download PDF

Info

Publication number
WO1997039466A1
WO1997039466A1 PCT/GB1997/001068 GB9701068W WO9739466A1 WO 1997039466 A1 WO1997039466 A1 WO 1997039466A1 GB 9701068 W GB9701068 W GB 9701068W WO 9739466 A1 WO9739466 A1 WO 9739466A1
Authority
WO
WIPO (PCT)
Prior art keywords
bridges
blanks
strip
actuators
actuator
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.)
Ceased
Application number
PCT/GB1997/001068
Other languages
English (en)
Inventor
Vincent Joseph Garvey
John Crawshaw Taylor
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.)
Strix Ltd
Original Assignee
Strix Ltd
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 Strix Ltd filed Critical Strix Ltd
Priority to EP97917347A priority Critical patent/EP0894326A1/fr
Priority to GB9822447A priority patent/GB2328167B/en
Publication of WO1997039466A1 publication Critical patent/WO1997039466A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H2037/525—Details of manufacturing of the bimetals, e.g. connection to non bimetallic elements or insulating coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • H01H2037/5472—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting having an omega form, e.g. the bimetallic snap element having a ring shape with a central tongue

Definitions

  • the present invention relates to bimetallic actuators, and more particularly to a method of making snap-acting thermally responsive bimetallic actuators.
  • actuators may comprise a domed bimetallic disc which moves to an oppositely domed configuration when it exceeds a predetermined temperature.
  • One particular actuator of this type which is very widely used today is disclosed in GB 1542252, and a method of manufacturing that actuator is disclosed in GB 1546578. In that method of manufacture, individual actuator blanks are stamped out from a strip of bimetallic material and subjected to a number of pressing operations to give the actuator the desired domed configuration, whereafter they are heat-treated to stabilise their operating temperature.
  • the present invention seeks to alleviate this problem, and from a first aspect provides a method of making snap-acting thermally sensitive bimetallic actuators comprising forming a series of actuator blanks in a strip of bimetallic material, adjacent blanks being joined by one or more bridges of the strip material, indexing said blanks through one or more deforming operations whilst they are joined together by the bridges, by indexing means associated with the bridges and then separating the blanks to form individual actuators .
  • the blanks remain joined to one another whilst having one or more deforming operations performed on them. They are indexed through a number of operation stages, by indexing means associated with the bridges. This allows for accurate movement and positioning of the blanks whilst obviating the need for separate means for transferring individual blanks between production stages. This will significantly improve production times and thereby reduce costs.
  • the bridges should be sufficiently flexible to allow the deforming operations to be performed on the blanks without breaking the bridges.
  • the doming operation will decrease the effective length of each blank.
  • the bridges in order to maintain the integrity of the strip of blanks during the subsequent processing steps, the bridges must be able to extend as the effective length of the blank decreases.
  • the bridges do not run linearly between successive blanks but are at least partially curved or angled such that they may extend during deformation of the blank.
  • two bridges are formed between adjacent blanks.
  • the bridge(s) is/are arranged offset from the axis of the series of blanks, and more preferably two bridges are provided linking adjoining sides of adjacent actuator blanks, most preferably being symmetrically arranged with respect to the said axis.
  • the various operations are performed sequentially on the bimetallic material as it moves in a stepwise manner through a progression tool having a succession of work stages.
  • the desired profile of the finished actuator is punched or stamped out of the strip material so as to leave the bridge( ⁇ ) between adjacent blanks.
  • the end positions of the bridges may be scored on the strip material so that the bridges can more easily be broken at those positions.
  • the scoring is preferably performed on the bimetallic material before the bridges are formed.
  • the bimetals formed by this process will generally be used as control sensors and it is therefore highly desirable that the bimetals are kept within clearly defined tolerances.
  • the scoring of the ends of the bridges ensures that the bridges may be broken from the resultant bimetals at precisely the correct position with regard to the required tolerances. In this way, the shape of the bimetal is maintained within the desired tolerances.
  • the blanks are indexed through one or more deforming operations by indexing means associated with the bridge(s) .
  • the bridge(s) is/are provided with formations, for example one or more openings, for engagement by the indexing means.
  • strip indexing or pilot holes may be formed in appropriate positions on the strip material prior to formation of the bridges.
  • the deforming operations performed on the blanks may comprise standard operations as disclosed, for example, in GB 1546578. These may include, therefore, doming the blank in a first direction, doming it in the opposition direction and then "trimming" the curvature.
  • the actuators may be heat-treated either after, or more preferably before, they have been separated from each other.
  • the method of the invention is not limited to any particular shape or configuration of actuator. It is most suited, however, to producing generally circular actuators, for example of the type disclosed in GB 1542252 which have a centrally released tongue, or solid circular bimetallic discs.
  • the invention extends to a snap-acting bimetallic actuator produced by the method of the invention.
  • Fig. 1 shows a strip of bimetallic actuators of the type described in GB 1542252 being produced in accordance with a method of the invention
  • Fig. 2 shows, schematically, a progression tool for carrying out the invention.
  • a strip 2 of bimetallic material is indexed in a stepwise manner through a progression tool 4 (Fig. 2) in which a number of operations are performed sequentially on a given portion of the strip 2 at a succession of stations A to J.
  • a number of actuator blanks 6 are first formed through stations A to F, the blanks being joined by a number of frangible bridges 8.
  • the bridges 8 are symmetrically formed offset from the axis of the blanks 6, such that the blanks 6 may be closely positioned together, with the bridges being formed within the width of the bimetallic strip, so that they are formed of material which would, ir. any event become scrap. This optimises use of the bimetallic material and reduces cost.
  • the joined blanks are then subjected to a number of deforming operations at stations G to I and are finally separated into individual actuators 10 at station J.
  • the finished actuators 10 are of the type disclosed in GB 1542252 which are domed and have a generally circular outer periphery 12, and a tongue 14 formed in an inner arcuate opening 16.
  • the tool 4 comprises a fixed base platen 18 and an upper platen 20 movable towards and away from the base platen 18.
  • the upper platen 20 abuts an upper plate 22 which mounts a number of punch or press tools which extend through a sprung, movable, intermediate plate 24 for engagement with complementary tool parts formed in a fixed base plate 26, as the upper platen 4 is moved downwardly.
  • the successive stations A to J of the tool will now be described.
  • the first operation performed on the strip 2 is performed at station A, where a pair of pilot holes 28 is formed on either side of the strip 2 by a punch and die 30. These holes 28 will allow for accurate location and indexing of the actuator blanks 6 between stations, and are engaged by indexing means (not shown) . As can be seen from Fig. 1 the pilot holes 28 are formed in positions such that they will lie within the bridges 8 formed between the blanks 6.
  • the next operation, performed at station B, is the formation of score marks 32 on the strip 2 at locations corresponding to the ends of the bridges 26. This will facilitate subsequent separation of the blanks 6 at these locations.
  • the scores 32 are produced by a punch 34 having projecting scoring portions (not shown) and an adjustable die plate 36, which can be moved up or down in the base plate 26 by a mechanism 38 so as to adjust the depth of the score produced in the material. In this embodiment four scores are produced at one time.
  • two holes 40,42 are produced in positions such that they will lie at the free end of the tongue 14 of the finished actuator 10. These are produced by punches and dies 44 in the tool 4.
  • the inner arcuate opening 16 and the tongue 14 of the actuator are then formed by punch and die 46 at station D, and the outer periphery 12 of the actuator 10 then punched out in two stages at stations E and F by respective punches and dies 48,50.
  • the shapes of the respective punches 48,50 are shown shaded in Fig. 1, from which it will be seen that the first punch and die 48 define the sides of the actuator and the second punch and die 50 the opposed edges of adjacent blanks 6. Between them, they also define the bridges 8 between adjacent blanks 6, which are joined to the blanks 6 at the score marks 32.
  • the bridges 8 have an enlarged central section 9 formed around the pilot holes 28, and curved end portions where they connect to respective blanks. The curved end portions allow the bridges to extend by deforming, without breaking during processing.
  • the base platen 6 has an opening 52 to allow metal removed through stations A to F to fall away form the tool for disposal.
  • an actuator blank 6 has been fully formed. It is then subjected to a number of deforming processes, known per se, at stations G to I.
  • each blank 6 is subjected to a "doming down" operation at station G by a spring loaded die 54 having a convexly domed lower face 56 which presses the actuator blank 6 against a rubber pad 58 constrained in the lower plate 26.
  • the blank 6 then moves through a rest station to station H where it is subjected to a 'doming up 1 operation by a second spring loaded die 60 having a concavely domed lower face 62 which presses the actuator blank 6 against a second rubber pad 64 mounted in the base plate 26.
  • the blank 6 then moves through a further rest station to station I where it is subjected to a
  • the actuator is fully formed and may then be heat treated either before or after it is separated from the rest of the strip 2. Separation can be achieved, for example by a punch (not shown) at station J pushing down on the actuator blank 6 sufficiently hard to break the bridges 8 at the scores 32.
  • the actuator blanks 6 move progressively through the tool 4 as a self supporting and self locating strip which avoids the need for separate location and transfer means. Operations are performed sequentially on a section of the strip as it passes through the tool 4 to form an actuator which is eventually separated form the end of the strip 2.
  • the shape of the actuator may be different to that disclosed, as may be the particular deforming operations.
  • the method may also be applicable to trimetallic actuators, and the term "bimetallic" as used herein should be interpreted as embracing any laminated metallic material comprising a plurality of layers of metallic materials having different coefficients of thermal expansion.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Punching Or Piercing (AREA)

Abstract

L'invention porte sur un procédé de fabrication de déclics bimétalliques thermosensibles consistant à former dans une bande (2) d'un matériau bimétallique une série d'ébauches (6) de déclics, les ébauches (6) contiguës restant reliées par un ou plusieurs ponts (8) du matériau de la bande. Les ébauches (6) sont déplacées pour subir une ou plusieurs déformations alors qu'elles restent reliées par les ponts (8), par des moyens de déplacement (28) associés aux ponts (8), puis les ébauches (6) sont séparées, de manière à constituer des déclics individuels.
PCT/GB1997/001068 1996-04-17 1997-04-17 Declics bimetalliques Ceased WO1997039466A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP97917347A EP0894326A1 (fr) 1996-04-17 1997-04-17 Declics bimetalliques
GB9822447A GB2328167B (en) 1996-04-17 1997-04-17 Bimetallic actuators

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9607962.9A GB9607962D0 (en) 1996-04-17 1996-04-17 Bimetallic Actuators
GB9607962.9 1996-04-17

Publications (1)

Publication Number Publication Date
WO1997039466A1 true WO1997039466A1 (fr) 1997-10-23

Family

ID=10792222

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1997/001068 Ceased WO1997039466A1 (fr) 1996-04-17 1997-04-17 Declics bimetalliques

Country Status (3)

Country Link
EP (1) EP0894326A1 (fr)
GB (1) GB9607962D0 (fr)
WO (1) WO1997039466A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006003204A3 (fr) * 2004-07-05 2006-02-16 Elektronik Werkstaette Ing Wur Procede de fabrication de disques a cliquet
CN105798122A (zh) * 2016-05-26 2016-07-27 广东机电职业技术学院 双金属温度碟片的一体成型模具及其成型方法
CN116646217A (zh) * 2023-06-14 2023-08-25 佛山市通宝华龙控制器有限公司 一种高寿命的双金属碟片及冲孔设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4152998A (en) * 1975-10-30 1979-05-08 Taylor John C Method for forming snap-acting thermally responsive actuators
US4796355A (en) * 1987-09-15 1989-01-10 B/K Patent Development, Inc. Snap action devices and methods and apparatus for making same
US5206622A (en) * 1992-04-10 1993-04-27 Texas Instruments Incorporated Protector device with improved bimetal contact assembly and method of making
GB2280785A (en) * 1993-08-03 1995-02-08 Otter Controls Ltd A thermally responsive switch

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4152998A (en) * 1975-10-30 1979-05-08 Taylor John C Method for forming snap-acting thermally responsive actuators
US4796355A (en) * 1987-09-15 1989-01-10 B/K Patent Development, Inc. Snap action devices and methods and apparatus for making same
US5206622A (en) * 1992-04-10 1993-04-27 Texas Instruments Incorporated Protector device with improved bimetal contact assembly and method of making
GB2280785A (en) * 1993-08-03 1995-02-08 Otter Controls Ltd A thermally responsive switch

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006003204A3 (fr) * 2004-07-05 2006-02-16 Elektronik Werkstaette Ing Wur Procede de fabrication de disques a cliquet
JP2008505469A (ja) * 2004-07-05 2008-02-21 エレクトロニック・ベルクシュテッテ・インジェニエーア・ブルムブ・ゲゼルシャフト・エム・ベー・ハー スナップディスクを製造する方法
KR101193491B1 (ko) 2004-07-05 2012-10-22 일렉트로닉 베르크스타테 잉그 웜 게엠베하 스냅 디스크의 제조방법
CN105798122A (zh) * 2016-05-26 2016-07-27 广东机电职业技术学院 双金属温度碟片的一体成型模具及其成型方法
CN116646217A (zh) * 2023-06-14 2023-08-25 佛山市通宝华龙控制器有限公司 一种高寿命的双金属碟片及冲孔设备
CN116646217B (zh) * 2023-06-14 2024-02-23 佛山市通宝华龙控制器有限公司 一种高寿命的双金属碟片的冲孔设备

Also Published As

Publication number Publication date
EP0894326A1 (fr) 1999-02-03
GB9607962D0 (en) 1996-06-19

Similar Documents

Publication Publication Date Title
EP0919304B1 (fr) Outil d' emboutissage et de frappe pour la fabrication des boítes métalliques
EP1319493B1 (fr) Procédé et dispositif pour détourer en moule des pièces thermoformées, démoulables par la bavure encore connecter partiellement avec des pièces
US20020005057A1 (en) Method of manufacturing heat exchanging fin and die set for manufacturing the same
US5592847A (en) Stepped segmented, closed-die forging
GB2353748A (en) Forming press apparatus
EP0919305B1 (fr) Outil d' emboutissage et de frappe pour la fabrication des boítes métalliques
US5544477A (en) Method of producing chain links for fine jewelry rope chains
US4205548A (en) Stamping tools
EP0894326A1 (fr) Declics bimetalliques
EP0249992B1 (fr) Procédé de fabrication de roues dentées droites
JP4129621B2 (ja) プレス金型
IE44399B1 (en) Improvements relating to method and apparatus for manufacturing snap-acting thermally responsive bimetallic actuators
KR100479917B1 (ko) 포밍및피어싱공정동시성형금형및이를이용한열교환기용냉각판제조방법
JPS6328694B2 (fr)
US4569256A (en) Method of making a seamless punch
KR102034525B1 (ko) 자동차 액츄에이터용 아마츄어 제작방법
JPH08117880A (ja) プレス装置
JPH1157873A (ja) 型絞り加工方法並びに型絞り用ダイス、型絞り用ポンチ及び型絞りプレス機
KR100219234B1 (ko) 냉간단조를 이용한 복합 이중원통형상 풀리의 제조방법 및 장치
EP0607907B1 (fr) Appareil de revenu de plaques en acier
EP0051901B1 (fr) Procédé de fabrication de segments pour boulons expansibles, dispositif de mise en oeuvre du procédé et boulon expansible comprenant des segments fabriqué par ce procédé
KR200142875Y1 (ko) 박판 펀칭용 프레스 금형
EP0046750B1 (fr) Procede et appareil d'aplatissement de plaques ondulees d'un echangeur de chaleur
RU2113312C1 (ru) Ступенчатый обрезной пуансон
JP2578289B2 (ja) ルーバ金型

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): GB JP US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
ENP Entry into the national phase

Ref country code: GB

Ref document number: 9822447

Kind code of ref document: A

Format of ref document f/p: F

WWE Wipo information: entry into national phase

Ref document number: 9822447.0

Country of ref document: GB

WWE Wipo information: entry into national phase

Ref document number: 1997917347

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1997917347

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: JP

Ref document number: 97536881

Format of ref document f/p: F

WWR Wipo information: refused in national office

Ref document number: 1997917347

Country of ref document: EP

WWW Wipo information: withdrawn in national office

Ref document number: 1997917347

Country of ref document: EP