GB2322818A - A method for producing a precision cylindrical valve member for a fluid flow valve apparatus - Google Patents
A method for producing a precision cylindrical valve member for a fluid flow valve apparatus Download PDFInfo
- Publication number
- GB2322818A GB2322818A GB9704452A GB9704452A GB2322818A GB 2322818 A GB2322818 A GB 2322818A GB 9704452 A GB9704452 A GB 9704452A GB 9704452 A GB9704452 A GB 9704452A GB 2322818 A GB2322818 A GB 2322818A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve member
- flute
- fluid flow
- cylindrical
- precision
- 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
Classifications
-
- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/04—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member
- F16K47/06—Means in valves for absorbing fluid energy for decreasing pressure or noise level, the throttle being incorporated in the closure member with a throttle in the form of a helical channel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
- B21K1/00—Making machine elements
- B21K1/20—Making machine elements valve parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
Abstract
The present invention provides a method for manufacturing a precision cylindrical valve member 10 for a fluid flow valve apparatus. The method comprises forming a helical flute 12 in an outer cylindrical surface of an elongated workpiece and then subjecting said workpiece to centreless grinding to form a precision valve member having a cylindrical form of predetermined diameter.
Description
A METHOD FOR PRODUCING A PRECISION CYLINDRICAL
VALVE MEMBER FOR A FLUID FLOW VALVE APPARATUS
The present invention relates to a method for producing a precision cylindrical valve member for a fluid flow valve apparatus.
Fluid flow valve apparatus, of which internal combustion engine fuel injection systems are one example, may include precision cylindrical valve members fitted into complementary cylindrical passages to act as check valves, delivery valves, spring seats or end stops, for example. In many cases, these valve members must permit the passage of fluid through them and this is normally accomplished by means of a through hole formed along the central axis of the valve member. Sometimes, however, the design of the fluid flow valve apparatus dictates that the fluid must pass around the periphery of the valve member.
Where the valve member is required to be a precision fit in a cylindrical passage of a valve apparatus, an external fluid path can be provided by means of a longitudinally extending flute/groove or flat formed in the outer surface/periphery of the valve member. Whilst this provides a good fluid flow pathway, the valve member becomes expensive to manufacture because, whilst the basic cylindrical valve member can be produced by lathe turning, the flute/groove or flat must be formed by a second separate machining process. Additionally, the existence of a longitudinal groove/flute or flat in the periphery of the cylindrical member prevents the member from being subjected to centreless grinding, this machining process being commonly utilised for forming precision cylindrical components after turning and hardening. In the case where a generally cylindrical component has a longitudinally extending flute/groove or flat in its periphery and grinding of said periphery is necessary for finishing the component, then it is necessary to provide at least one centre in an end of the component to permit mounting of the component for the relatively expensive centre location grinding process.
It is an object of the present invention to provide a method for producing a precision cylindrical valve member for a fluid flow apparatus, said valve member having external fluid flow means, which obviates the above described machining difficulties.
It is a further object of the invention to provide a method for forming a precision cylindrical valve member for a fluid flow valve apparatus without the need to provide precision produced blanks as a starting point for the method of the invention.
According to a first aspect of the present invention, there is provided a method for producing a precision cylindrical valve member for location, in use, in a complementary cylindrical passage of a fluid flow valve apparatus, said method comprising the steps of: forming at least one spiral flute in an outer cylindrical surface of an elongated workpiece; and subjecting said fluted workpiece to a centreless grinding process to machine lands comprising the cylindrical outer surface of the fluted workpiece adjacent to said at least one flute to provide a precision valve member of predetermined diameter.
According to a second aspect of the present invention, there is provided a precision cylindrical valve member formed in accordance with the method of the first aspect of the present invention.
According to a third aspect of the present invention, there is provided a fluid flow valve apparatus including a valve member formed in accordance with the method of the first aspect of the present invention.
The foregoing and further features of the present invention will be more readily understood from the following description of a preferred embodiment, by way of example thereof, with reference to the accompanying drawings, of which:
Figure 1 is a side elevation of a precision cylindrical valve member having external fluid flow means manufactured in accordance with the present invention; and
Figure 2 is a cross sectional view through a portion of a fluid flow valve apparatus including a precision cylindrical valve member manufactured in accordance with the present invention.
Figure 1 is a side elevation of a precision cylindrical valve member 10 manufactured in accordance with the method of the present invention. Instead of having a fluid flow flute formed in the outer surface of the valve member which extends parallel to a central axis x-x of said valve member, the valve member 10 has a fluid flow path provided by means of a flute 12 formed in said outer surface 14 which spirals along the length of the valve member 10 with respect to the central axis x-x. In fact. In a preferred embodiment, the valve member 10 has a fluid flow path comprising four flutes 12 each having a helix angle of 36". In the preferred embodiment of the invention, the flute helix angle is chosen such that each flute 12 describes a 360" revolution over the length of the valve member 10. In the preferred embodiment, the flutes 12 are semi-circular in cross section, but it will be appreciated that they may have any suitable crosssection according to design constraints.
The flutes 12 can be formed in an elongated generally cylindrical workpiece by a metal-cut machining process such as, for example, turning under the control of a computerised numerically controlled (CNC) lathe.
Alternatively, the valve member 10 can be produced complete with the spiral flutes 12 by other known methods such as cold forming. Irrespective of the method of forming the flutes 12 in the valve member 10, it is necessary to subsequently grind the outer surface 14 of the valve member 10 in order to precisely determine its external diameter. This is achieved by a centreless grinding process. It is possible to use a centreless grinding process due to the fact that, despite the existence of the spiral flutes 12 in the outer surface 14 of the valve member 10, for the purposes of centreless grinding, the valve member is essentially cylindrically shaped. That is, the centreless grinder will operate on the valve member as though it had a completely round cross section. The lands 16 between the flutes 12 on the outer surface 14 of the valve member 10 provide the contact with the support plate of the centreless guider necessary for centreless grinding. This contrasts with the situation in which the valve member is provided with a longitudinally extending flute or flat in its outer surface, whereby it would be impossible to employ centreless grinding to form a precision fit valve member. In such a case, it would be necessary to provide at least one centre recess in an end of the valve member to enable it to be mounted for the generally slower and more expensive centre location grinding process. Thus, the present invention provides a less expensive method of forming a precision fit cylindrical valve member.
Figure 2 is a cross-sectional view of a portion of a valve apparatus in which the valve member 10 manufactured in accordance with the method of the present invention forms a precision fit in a complementary cylindrical passageway 18 of the valve apparatus body 20. One end 10a of the valve member 10 is formed to receive a spring 22 for controlling axial movement of the valve member 10 within the valve apparatus body 20.
Claims (12)
1. A method for producing a precision cylindrical valve member for location, in use, in a complementary cylindrical passage of a fluid flow valve apparatus, said method comprising the steps of: forming at least one spiral flute in an outer cylindrical surface of an elongated workpiece; and subjecting said fluted workpiece to a centreless grinding process to machine lands comprising the cylindrical outer surface of the fluted workpiece adjacent to said at least one flute to provide a precision valve member of predetermined diameter.
2. A method as claimed in claim 1, wherein the at least one spiral flute is formed in the outer cylindrical surface of the valve member by metal cut machining.
3. A method as claimed in claim 1, wherein the at least one spiral flute is formed in the outer cylindrical surface of the valve member by twisting an elongated workpiece having a longitudinally extending flute formed in its outer surface, said workpiece being twisted through an angle sufficient to cause said longitudinally extending flute to generally define a helix in the outer cylindrical surface of the valve member.
4. A method as claimed in any preceding claim, wherein the valve member is formed to have four spiral flutes in its outer cylindrical surface.
5. A method as claimed in claim 4, wherein each flute is formed to have a helix angle of 360.
6. A method as claimed in any preceding claim, wherein the at least one flute is formed such that it describes a 360 revolution with respect to the longitudinal central axis of the valve member.
7. A method as claimed in any preceding claim, wherein each flute extends over that part of the valve member cylindrical outer surface having a diameter equal to the maximum external diameter of said valve member.
8. A valve member made in accordance with the method of any one of claims 1 to 7.
9. A fluid flow valve apparatus including a valve member made in accordance with the method of any one of claims 1 to 7.
10. A method substantially as hereinbefore described with reference to the drawing.
11. A valve member substantially as hereinbefore described with reference to the drawing.
12. A valve apparatus substantially as hereinbefore described with reference to the drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9704452A GB2322818B (en) | 1997-03-04 | 1997-03-04 | A method for producing a precision cylindrical valve member for a fluid flow valve apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9704452A GB2322818B (en) | 1997-03-04 | 1997-03-04 | A method for producing a precision cylindrical valve member for a fluid flow valve apparatus |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9704452D0 GB9704452D0 (en) | 1997-04-23 |
| GB2322818A true GB2322818A (en) | 1998-09-09 |
| GB2322818B GB2322818B (en) | 1999-09-15 |
Family
ID=10808665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9704452A Expired - Fee Related GB2322818B (en) | 1997-03-04 | 1997-03-04 | A method for producing a precision cylindrical valve member for a fluid flow valve apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2322818B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052716A (en) * | 2017-03-31 | 2017-08-18 | 安徽再制造工程设计中心有限公司 | Tungsten carbide Corrugator roller manufacturing process |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2092080A (en) * | 1981-01-30 | 1982-08-11 | British Leyland Cars Ltd | Power steering servo valves |
-
1997
- 1997-03-04 GB GB9704452A patent/GB2322818B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2092080A (en) * | 1981-01-30 | 1982-08-11 | British Leyland Cars Ltd | Power steering servo valves |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107052716A (en) * | 2017-03-31 | 2017-08-18 | 安徽再制造工程设计中心有限公司 | Tungsten carbide Corrugator roller manufacturing process |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9704452D0 (en) | 1997-04-23 |
| GB2322818B (en) | 1999-09-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20140304 |