GB2315444A - Riveting process - Google Patents
Riveting process Download PDFInfo
- Publication number
- GB2315444A GB2315444A GB9615083A GB9615083A GB2315444A GB 2315444 A GB2315444 A GB 2315444A GB 9615083 A GB9615083 A GB 9615083A GB 9615083 A GB9615083 A GB 9615083A GB 2315444 A GB2315444 A GB 2315444A
- Authority
- GB
- United Kingdom
- Prior art keywords
- component
- substrate
- rivetting
- projection
- die
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 41
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000004411 aluminium Substances 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 11
- 238000005485 electric heating Methods 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 3
- 229910000838 Al alloy Inorganic materials 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 11
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 230000001012 protector Effects 0.000 description 4
- 230000000717 retained effect Effects 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 241000237858 Gastropoda Species 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J15/00—Riveting
- B21J15/02—Riveting procedures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B5/00—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them
- F16B5/04—Joining sheets or plates, e.g. panels, to one another or to strips or bars parallel to them by means of riveting
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Connection Of Plates (AREA)
Abstract
A rivetting process, useful in the manufacture of prototype heating elements requires a substrate component 1 to be faced up to a second component 6 of greater hardness and a punch 2 and die 3 to be used to form a rivetting projection 4 from that side of the substrate component 1 which faces away from the second component 6, the punch 2 being driven into and through the second component 6 and into the substrate component 1 so as to detach from the second component 6 a slug 7 of material which is forced into the substrate component 1 and causes substrate material to enter the die 3 to form the rivetting projection 4. A subsequent rivetting operation upon the rivetting projection 4 backed by the slug 7 advantageously does not result in the collapse of the rivetting projection.
Description
IMPROVEMENTS RELATING TO ELECTRIC HEATING
ELEMENTS AND CONTROLS THEREFOR
Field of the Invention:
This invention generally concerns an improved manufacturing method and more particularly, though not exclusively, concerns the manufacture of electric heating elements for water boiling vessels such as kettles, pots, pans, jugs, urns, laboratory equipment and the like and the attachment of element protector controls and electrical connector systems to such electric heating elements.
Background of the Invention:
Electric immersion heater elements of the kind comprising a wound electrical resistance wire housed with insulation within a metal sheath have been widely used, particularly in the UK, for many years, but planar heating elements are gaining in popularity not least on account of the uncluttered vessel interior that results from their use. One kind of planar heating element that is well known is an aluminium plate which has cast or clenched into its undersurface a sheathed heating element of the abovementioned type.
For the attachment of element protector controls, that is to say controls for switching off the supply of electricity to the heating element in an element overtemperature situation caused for example by switching the element on in a dry condition, and electrical inlet connections to elements of this kind it has been proposed to form protrusions from the undersurface of the aluminium plate which can then be used to rivet the control and the inlet connection to the element. See, for example, our British Patent
Applications Nos. 9522594.2 and 9607413.3 in this connection.
The manufacturing process for an electric heating element of the abovementioned type comprising an aluminium plate and a sheathed heating element affixed thereto commonly begins with the casting of an aluminium substrate to be subsequently formed into an element base plate. The aluminium substrate may be die cast, which requires expensive tooling, and precision machined dies are then required for forming the base plate, bonding the sheathed heating element to the base plate and forming any mounting protrusions or rivets that might be required. Whilst this method is suitable for manufacturing production, its reliance upon expensive tooling renders it impractical to use the same process in the development of new element forms, or to test new element protector controls and other product improvements.
For such test work it has therefore been conventional to use a much simpler approach. The heating element base plate is formed from a flat sheet or plate of aluminium, and rivets and any similar features that are required are formed by pressing from the back side of the sheet. However, this operation leaves a cavity where the feature is pressed out of the sheet and this can cause difficulties when it is attempted to rivet an element protector control or the like onto the aluminium base plate. Since the projection defining the rivet is hollow, the act of forming a head on the rivet can cause the projection to collapse back into the cavity behind the plate so that the rivet is ineffective.
Obiects and Summary of the Invention:
Accordingly, it is the principal object of the present invention to overcome or at least substantially reduce the abovementioned problem associated with the development of new heating elements and/or accessories for attachment thereto.
Another object of the present invention is to provide an improved rivetting method which has general application.
According to the present invention, the above objects are achieved in a process for rivetting to a substrate component in which the substrate component is faced up to a second sheet component of similar composition to the material of the substrate component but of greater hardness, and a punch and die are used to form a rivetting projection from that side of the substrate component which faces away from the second sheet component, the punch being driven into and through the second sheet component and into the substrate component so as to detach from the second sheet component a small slug of material which is forced into the substrate component and causes substrate material to enter the die to form said rivetting projection.
By virtue of the penetration of the punch through the second sheet component, the small slug of material which is detached from the second component and pressed into the substrate behind the formed protrusion is retained in the substrate and can serve to support the protrusion during a subsequent rivetting operation. In the prototyping of a new element form or a new control therefor, the required number of projections are formed as above described in the substrate component and the substrate component might for example then be attached to a stainless steel plate intended to form the base of a liquid heating vessel so that the small metal slugs detached from the second sheet are permanently retained between the substrate and the stainless steel plate and will support the protrusions during subsequent rivetting operations.
The invention will best be understood from consideration of the following detailed description which is given with reference to the accompanying drawings.
Description of the Drawings:
Figure 1A, 1B and 1C schematically illustrate a prior art rivetting operation; and
Figures 2A, 2B and 2C schematically illustrate the process of the present invention.
Detailed Description of the Embodiments:
Figure 1A shows an aluminium substrate 1 arranged between a punch 2 and a die 3, Figure 1B shows the rivetting projection 4 that is formed in the substrate 1 when the punch is operated and additionally shows the cavity 5 that is formed behind the projection, and
Figure 1C shows what can happen if the projection 4 is used in a rivetting operation, namely the projection 4 simply collapses into the cavity 5 and the rivet is ineffective.
In Figure 2A a second sheet 6 of harder material than the aluminium substrate 1 is sandwiched with the substrate 1 between the punch 2 and the die 3. For example, the substrate 1 may be a rolled aluminium sheet of 3mm thickness and the second sheet 6 may be an extruded aluminium alloy sheet of 2.5mm thickness.
When the punch 2 is operated, it is driven just through the second sheet 6 so as to detach therefrom a small slug 7 which drives the softer material of the substrate 1 into the die 3 so as to form the projection 4. Figure 2C shows the completed rivetting projection 4 with the retained slug 7, the slug 7 being held in place by friction and by some slight friction welding. Figure 2B shows the die 2 at the end of its stroke.
A subsequent rivetting operation upon the projection 4 backed by the slug 7, as shown in Figure 2C, does not result in the collapse of the projection and can be effective.
The process as abovedescribed is particularly well suited to the manufacture of prototypes, because of its low tooling costs, but could also be used for the manufacturing production of heating elements in which case the use of a simple rolled sheet material for the element substrate would represent a considerable cost saving as compared to a conventional die cast version. In a production process according to the present invention the substrate sheet and the second sheet could be fed together through the press tool to form the projection(s) in a single pressing operation, and the second sheet could then be recycled for further use.
The two materials of the substrate and the second sheet could be of any composition, provided that the second sheet was harder than the substrate. However, it is preferred that the two materials should be chemically similar to avoid undesirable galvanic effects.
Whilst the invention has been described in the foregoing by reference to the manufacture of elements for electric kettles, the invention has wider application and the foregoing description is in all respects exemplary.
Claims (7)
1. A process for rivetting to a substrate component comprising facing the substrate component up to a second component of greater hardness and using a punch and die to form a rivetting projection from that side of the substrate component which faces away from the second component, the punch being driven into and through the second component and into the substrate component so as to detach from the second component a slug of material which is forced into the substrate component and causes substrate material to enter the die to form a rivetting projection.
2. A process as claimed in claim 1 wherein the substrate component and the second component are formed of materials of similar composition.
3. A process as claimed in claim 2 wherein the substrate component comprises rolled aluminium sheet material and the second component comprises an extruded aluminium alloy.
4. A process as claimed in any preceding claim wherein the substrate component comprises a part of an electric heating element.
5. A process as claimed in any preceding claim wherein sheet substrate material and sheet material for constituting said second component are supplied together to said punch and die.
6. An electric heating element comprising a substrate component formed with rivetting projections by a process as claimed in any of the preceding claims.
7. An electric heating element as claimed in claim 6 having at least one accessory affixed to said substrate component by use of said rivetting projections.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9615083A GB2315444B (en) | 1996-07-18 | 1996-07-18 | Improvements relating to electric heating elements and controls therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9615083A GB2315444B (en) | 1996-07-18 | 1996-07-18 | Improvements relating to electric heating elements and controls therefor |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9615083D0 GB9615083D0 (en) | 1996-09-04 |
| GB2315444A true GB2315444A (en) | 1998-02-04 |
| GB2315444B GB2315444B (en) | 2000-03-22 |
Family
ID=10797112
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9615083A Expired - Fee Related GB2315444B (en) | 1996-07-18 | 1996-07-18 | Improvements relating to electric heating elements and controls therefor |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2315444B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10314544A1 (en) * | 2003-03-31 | 2004-10-14 | BSH Bosch und Siemens Hausgeräte GmbH | Forming interlocking connection between thin-walled materials, inserts surface projection through passage in second surface and rivets projection over opening |
-
1996
- 1996-07-18 GB GB9615083A patent/GB2315444B/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10314544A1 (en) * | 2003-03-31 | 2004-10-14 | BSH Bosch und Siemens Hausgeräte GmbH | Forming interlocking connection between thin-walled materials, inserts surface projection through passage in second surface and rivets projection over opening |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9615083D0 (en) | 1996-09-04 |
| GB2315444B (en) | 2000-03-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20080718 |