GB2265108A - Manufacture of ring-shaped articles - Google Patents

Manufacture of ring-shaped articles Download PDF

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Publication number
GB2265108A
GB2265108A GB9205168A GB9205168A GB2265108A GB 2265108 A GB2265108 A GB 2265108A GB 9205168 A GB9205168 A GB 9205168A GB 9205168 A GB9205168 A GB 9205168A GB 2265108 A GB2265108 A GB 2265108A
Authority
GB
United Kingdom
Prior art keywords
coiled
support surface
elongate
ring
length
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Withdrawn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
GB9205168A
Other versions
GB9205168D0 (en
Inventor
Gavin Stuart Oseman
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.)
Dowty Seals Ltd
Original Assignee
Dowty Seals 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 Dowty Seals Ltd filed Critical Dowty Seals Ltd
Priority to GB9205168A priority Critical patent/GB2265108A/en
Publication of GB9205168D0 publication Critical patent/GB9205168D0/en
Publication of GB2265108A publication Critical patent/GB2265108A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
    • B29C69/001—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore a shaping technique combined with cutting, e.g. in parts or slices combined with rearranging and joining the cut parts
    • B29C69/002—Winding
    • B29C69/003—Winding and cutting longitudinally, e.g. for making O-rings; chain links, insulation tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
    • B29L2031/7096—Rings or ring-like articles

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Abstract

Ring-shaped articles are manufactured by providing an elongate length of material (1) of a predetermined cross-section which is flexible laterally of its longitudinal axis, coiling said elongate length of material against a cylindrical support surface (2) such as a mandrel so that successive turns thereof are supported by said support surface, treating said elongate length of material by a process such as heat treatment whilst coiled against said support surface so that it is set in the coiled shape, and cutting through the coiled material along a line (4) extending laterally across successive turns thereof so as to produce individual ring-shaped lengths each corresponding to one complete turn of the coiled material with adjacent ends that can be brought into end-to-end alignment by lateral flexing of each individual length. <IMAGE>

Description

MANUFACTURE OF RING-SHAPED ARTICLES Technical Field This invention relates to a method of manufacturing ring-shaped articles, especially articles composed of thermoplastics material.
It is known to manufacture the bearing ring for a hydraulic piston head by an injection moulding process or a machining process. Injection moulding can involve high tooling costs, especially when the bearing ring has a complicated cross-section and multi-part moulds are required.
Furthermore, injection moulded rings of larger cross-section can suffer from surface sinkage problems produced by differential cooling of the moulded material. Machining on the other hand can involve a high degree of wastage especially with larger diameter bearing rings which are machined from flat sheet rather than tubular stock.
Disclosure of the Invention An object of the present invention is to provide a method of manufacturing thermoplastic ring-shaped articles which avoids the aforesaid disadvantages of high tooling costs and material waste of the known manufacturing processes.
According to the present invention, the method consists in providing an elongate length of material of a predetermined cross-section which is flexible laterally of its longitudinal axis, coiling said elongate length of material against a cylindrical support surface so that successive turns thereof are supported by said support surface, treating said elongate length of material whilst coiled against said support surface so that it is set in the coiled shape, and cutting through the coiled material along a line extending laterally across successive turns thereof so as to produce individual ring-shaped lengths each corresponding to one complete turn of the coiled material with adjacent ends that can be brought into end-to-end alignment by lateral flexing of each individual length.
Preferably, the elongate material is a thermoplastics material which is coiled on the external cylindrical surface of a mandrel, and is subsequently heat treated so as to be set in the coiled shape before being cut along a helical line to separate the successive turns into the individual ring-shaped articles.
The elongate material is preformed with the required cross-section for the final article and may be an extrusion. The radial dimensions of the cylindrical support surface correspond to the required radial dimensions of the final article, although an allowance may need to be made for dimensional changed caused by the heat treatment process or any other shape setting process used, and any removal of material in the cutting process.
The flexibility of the elongate material is dependent on the nature of the material itself and also its cross-section, the aspect ratio of width to depth of the cross-section being a major factor. The degree of flexibility required is in turn dependent on the radius of the ring-shaped articles being manufactured.
It will be appreciated that the invention provides a relatively simple method of manufacturing ring-shaped articles without any particular limitations on cross-section or radius and without involving any substantial waste of the materials used.
Description of the Drawings The invention will now be described by way of example with reference to the accompanying drawings in which: Figure 1 is a side elevation of a diametral section through a bearing ring manufactured by a method according to the invention, and Figure 2 is a schematic side elevation of a mandrel on which an elongate length of material is coiled to manufacture the bearing ring of Figure 1 according to the invention.
Mode of Carrying Out the Invention The bearing ring as shown in Figures 1 and 2 is made from a length of elongate material comprising an extrusion of ultra high molecular weight polyethylene with a T-shaped cross-section as illustrated. Said length of material 1 is coiled on the outer cylindrical surface of a mandrel 2 at room temperature, each end of the material 1 being secured to the mandrel by a clamp 3. Only one of the clamps 3 is shown in Figure 2 because not all of the material has been wound onto the mandrel at the stage of the process illustrated. However, it will be appreciated that the other clamp is located on the mandrel so as to cooperate with the other free end of the material, the material being of a predetermined length and width and having the successive turns abutting one another along the length of the mandrel.The mandrel 2 may be supported in a machine so as to be rotated to coil the material onto it, and the material may be fed manually or by a feed mechanism.
Once the mandrel has the material coiled on it and clamped in place, the mandrel is placed in an oven which is then heated to a predetermined temperature for a predetermined time so that the material takes a permanent set corresponding to its coiled shape on the mandrel. The selected temperature and time is such as to produce the required shape setting without causing any degradation of the material itself which might otherwise have an adverse effect on the properties of the finished bearing ring.
After removal from the oven, the coiled material 1 is cut along a line which runs helically around the mandrel 2 from one end to the other so that successive turns of the material are cut into individual ring-shaped lengths. This cut is made along the length of a slot or groove 4 in the mandrel which accommodates the edge of a cutting blade guided across the outer surface of the mandrel. The mandrel is preferably supported in a machine in the required orientation relative to the cutting blade, and the relative movement between the two controlled in a pre-programmed manner. If necessary, clamping means may be provided to support the material one or both sides of the groove 4 so that the cut ends of the material do not hinder the cutting process as it proceeds.
The angle of the cut across the coiled material is selected to suit that required for the abutting adjacent ends of the finished bearing ring as formed by each individual turn after cutting. It will be appreciated that the lateral flexibility of the material 1 allows the adjacent cut ends to be brought into abutting alignment in use when the bearing ring is assembled over a shaft with which it is to be used.

Claims (6)

1. A method of manufacturing ring-shaped articles comprising providing an elongate length of material of a predetermined cross-section which is flexible laterally of its longitudinal axis, coiling said elongate length of material against a cylindrical support surface so that successive turns thereof are supported by said support surface, treating said elongate length of material whilst coiled against said support surface so that it is set in the coiled shape, and cutting through the coiled material along a line extending laterally across successive turns thereof so as to produce individual ring-shaped lengths each corresponding to one complete turn of the coiled material with adjacent ends that can be brought into end-to-end alignment by lateral flexing of each individual length.
2. A method as claimed in claim 1 in which the elongate material is a thermoplastics material which is heat treated to set it in the coiled shape.
3. A method as claimed in claim 1 or 2 in which the elongate material is coiled on a support surface formed externally on a mandrel.
4. A method as claimed in any one of the preceding claims in which the elongate material is an extrusion.
5. A method as claimed in any one of the preceding claims in which the support surface is formed with a groove or slot which extends along said cutting line to accommodate a cutting blade.
6. A method of manufacturing ring-shaped articles substantially as herein described with reference to the accompanying drawings.
GB9205168A 1992-03-10 1992-03-10 Manufacture of ring-shaped articles Withdrawn GB2265108A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9205168A GB2265108A (en) 1992-03-10 1992-03-10 Manufacture of ring-shaped articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9205168A GB2265108A (en) 1992-03-10 1992-03-10 Manufacture of ring-shaped articles

Publications (2)

Publication Number Publication Date
GB9205168D0 GB9205168D0 (en) 1992-04-22
GB2265108A true GB2265108A (en) 1993-09-22

Family

ID=10711814

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9205168A Withdrawn GB2265108A (en) 1992-03-10 1992-03-10 Manufacture of ring-shaped articles

Country Status (1)

Country Link
GB (1) GB2265108A (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB535496A (en) * 1940-03-18 1941-04-10 Roland Claude Cross Improvements in the manufacture of wire piston and other rings
GB576402A (en) * 1944-06-30 1946-04-02 Roland Claude Cross Improvements in the manufacture of piston and other rings
GB588305A (en) * 1943-11-24 1947-05-20 British Thomson Houston Co Ltd Improvements in and relating to resilient cemented carbide articles and methods and apparatus of manufacturing them
GB617560A (en) * 1946-10-07 1949-02-08 Roland Claud Cross Improvements in and relating to the manufacture of rings from wire
GB708252A (en) * 1950-10-24 1954-05-05 Formica Company Improvements in or relating to an annular body of laminated material, such as pistonrings and coiled springs and method of making same
GB1335811A (en) * 1970-04-29 1973-10-31 Heaton J S Heaton J S Endless belts
GB2064418A (en) * 1979-12-07 1981-06-17 Chesterton A W Co Method of making packing seals

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB535496A (en) * 1940-03-18 1941-04-10 Roland Claude Cross Improvements in the manufacture of wire piston and other rings
GB588305A (en) * 1943-11-24 1947-05-20 British Thomson Houston Co Ltd Improvements in and relating to resilient cemented carbide articles and methods and apparatus of manufacturing them
GB576402A (en) * 1944-06-30 1946-04-02 Roland Claude Cross Improvements in the manufacture of piston and other rings
GB617560A (en) * 1946-10-07 1949-02-08 Roland Claud Cross Improvements in and relating to the manufacture of rings from wire
GB708252A (en) * 1950-10-24 1954-05-05 Formica Company Improvements in or relating to an annular body of laminated material, such as pistonrings and coiled springs and method of making same
GB1335811A (en) * 1970-04-29 1973-10-31 Heaton J S Heaton J S Endless belts
GB2064418A (en) * 1979-12-07 1981-06-17 Chesterton A W Co Method of making packing seals

Also Published As

Publication number Publication date
GB9205168D0 (en) 1992-04-22

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)