GB2145656A - Method of rotational casting - Google Patents
Method of rotational casting Download PDFInfo
- Publication number
- GB2145656A GB2145656A GB08422118A GB8422118A GB2145656A GB 2145656 A GB2145656 A GB 2145656A GB 08422118 A GB08422118 A GB 08422118A GB 8422118 A GB8422118 A GB 8422118A GB 2145656 A GB2145656 A GB 2145656A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- axis
- rpm
- rotational casting
- oven
- 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- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims description 31
- 238000010106 rotational casting Methods 0.000 title claims description 17
- 239000012815 thermoplastic material Substances 0.000 claims abstract description 9
- 238000005266 casting Methods 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- 238000000465 moulding Methods 0.000 claims description 2
- 239000004033 plastic Substances 0.000 claims description 2
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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
A mould (1) is rotated about a single stationary inclined axis (5). The mould contains a thermoplastic material and is heated in an oven (6). A fan (F) is used to cool the mould (1) on its withdrawal from the oven (6). The angle of inclination of the axis (5) is variable. <IMAGE>
Description
SPECIFICATION
Method of rotational casting
The present invention relates to a method of rotational casting, in particular to a method of forming prosthetic limb parts by rotational casting.
Methods of rotational casting, for example for making plastic footballs or containers, are known wherein a mould containing a powdered thermoplastic material is heated and simultaneously rotated about two perpendicular axes or rotated about one axis the angle of which to the horizontal is then continuously varied.
The known methods have the disadvantage that complicated machinery is needed to hold and rotate the mould about the axes and that the machinery is required to be very large since a large volume is swept out by the rotating mould.
The method of the invention has the advantage of being simple and easy to use compared to the known methods.
According to the invention there is provided a method of rotational casting wherein a mould is rotated about one substantially stationary axis, which axis is tilted wtih respect to the horizontal.
An embodiment of the invention is described below, by example only, with reference to the accompanying drawing which is a schematic view of a rotational casting machine for use in the method of the invention.
As schematically shown in Figure 1, a mould 1 is clamped between two plates 2, 3 mounted on a rotating shaft 4. The shaft 4 rotates about a axis 5.
The mould 1 is for moulding a tapered temporary prosthesis or pylon, but the mould could be for articles of a variety of shapes.
An oven 6 is provided and this oven and the clamped mould are movable relative to one another so that the oven can surround the mould 1.
A fan 7 is provided for cooling the mould 1.
The angle which the axis 5 makes with the horizontal can be adjusted before casting by moving the shaft 4 about pivot 8.
In operation, the desired angle of tilt of axis 5 is adjusted, the mould 1 with an amount of powdered thermoplastic material therein is clamped between plates 2, 3 the oven 6 is moved over the mould and the mould is rotated at the same time as being heated.
As the mould is heated, the powdered thermoplastic material melts and forms a film or layer on the surface of the mould. This layer is, by virtue of the tilt of the axis of rotation, evenly distributed within the mould without the need for the mould to be simultaneously rotated about a different axis or for the axis of rotation to be varied.
Different distribution of the thermoplastic material within the mould may be obtained by varying the pre-set angle of tilt and/or the speed of rotation. Thus a varying or fixed wall thickness can be obtained along the length of the mould as required.
Typically the angle of tilt might be between 10 and 150 and the speed of rotation might be from 5 rpm up to 200 rpm, more preferably up to 70 rpm.
The temperature might be about 350 C.
After a sufficient amount of time, the heating is stopped by the removal of the oven 6, and the still rotating mould 1 is cooled in air blown by the fan 7.
When the mould has cooled it is unclamped and opened and the moulded article is removed.
1. A method of rotational casting wherein a mould is rotated about one substantially stationary axis, which axis is tilted with respect to the horizontal.
2. A method according to claim 1, wherein the angle of tilt is between 10 and 150.
3. A method according to claim 1 or 2, wherein the speed of rotation is between 5 rpm and 200 rpm.
4. A method according to claim 3, wherein the said speed is between 5 rpm and 70 rpm.
5. A method according to any preceding claim being for forming prosthetic limb parts.
6. A method of rotational casting substantially as herein described with reference to the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (6)
1. A method of rotational casting wherein a mould is rotated about one substantially stationary axis, which axis is tilted with respect to the horizontal.
2. A method according to claim 1, wherein the angle of tilt is between 10 and 150.
3. A method according to claim 1 or 2, wherein the speed of rotation is between 5 rpm and 200 rpm.
4. A method according to claim 3, wherein the said speed is between 5 rpm and 70 rpm.
5. A method according to any preceding claim being for forming prosthetic limb parts.
6. A method of rotational casting substantially as herein described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB838323613A GB8323613D0 (en) | 1983-09-02 | 1983-09-02 | Rotational casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8422118D0 GB8422118D0 (en) | 1984-10-03 |
| GB2145656A true GB2145656A (en) | 1985-04-03 |
Family
ID=10548260
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB838323613A Pending GB8323613D0 (en) | 1983-09-02 | 1983-09-02 | Rotational casting |
| GB08422118A Withdrawn GB2145656A (en) | 1983-09-02 | 1984-08-31 | Method of rotational casting |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB838323613A Pending GB8323613D0 (en) | 1983-09-02 | 1983-09-02 | Rotational casting |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB8323613D0 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0255284A1 (en) * | 1986-07-22 | 1988-02-03 | Gec-Marconi Limited | Radar reflector |
| WO2010036130A1 (en) | 2008-09-24 | 2010-04-01 | Charles Caulder Bree | Moulded, modular building |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB382024A (en) * | 1930-09-26 | 1932-10-20 | Martin Stuehler | Improvements in or relating to centrifugal machines for making conical hollow bodies, particularly reinforced concrete masts or the like |
| GB576149A (en) * | 1941-05-28 | 1946-03-21 | Pont A Mousson Fond | Centrifugated tubular bodies and process for their manufacture |
| GB914584A (en) * | 1961-01-30 | 1963-01-02 | Sterling William Alderfer | Production of foamed plastic articles |
| GB1253315A (en) * | 1968-10-02 | 1971-11-10 | Howard Bryan Carter | Process and apparatus for forming thermoplastic articles |
| GB1278137A (en) * | 1970-08-26 | 1972-06-14 | Stewart Pivar | Improvements in or relating to apparatus for molding hollow objects from thermoplastic materials |
| GB1358360A (en) * | 1972-08-15 | 1974-07-03 | Usui F | Method of forming a tapered pipe |
-
1983
- 1983-09-02 GB GB838323613A patent/GB8323613D0/en active Pending
-
1984
- 1984-08-31 GB GB08422118A patent/GB2145656A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB382024A (en) * | 1930-09-26 | 1932-10-20 | Martin Stuehler | Improvements in or relating to centrifugal machines for making conical hollow bodies, particularly reinforced concrete masts or the like |
| GB576149A (en) * | 1941-05-28 | 1946-03-21 | Pont A Mousson Fond | Centrifugated tubular bodies and process for their manufacture |
| GB914584A (en) * | 1961-01-30 | 1963-01-02 | Sterling William Alderfer | Production of foamed plastic articles |
| GB1253315A (en) * | 1968-10-02 | 1971-11-10 | Howard Bryan Carter | Process and apparatus for forming thermoplastic articles |
| GB1278137A (en) * | 1970-08-26 | 1972-06-14 | Stewart Pivar | Improvements in or relating to apparatus for molding hollow objects from thermoplastic materials |
| GB1358360A (en) * | 1972-08-15 | 1974-07-03 | Usui F | Method of forming a tapered pipe |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0255284A1 (en) * | 1986-07-22 | 1988-02-03 | Gec-Marconi Limited | Radar reflector |
| US4823131A (en) * | 1986-07-22 | 1989-04-18 | Bell Stephen W | Radar reflector |
| WO2010036130A1 (en) | 2008-09-24 | 2010-04-01 | Charles Caulder Bree | Moulded, modular building |
| JP2012503563A (en) * | 2008-09-24 | 2012-02-09 | コールダー ブリー チャールズ | Molded modular building |
| AU2009297185B2 (en) * | 2008-09-24 | 2016-04-28 | Charles Caulder Bree | Moulded, modular building |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8422118D0 (en) | 1984-10-03 |
| GB8323613D0 (en) | 1983-10-05 |
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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) |