WO1999019114A1 - Apparatus for machining workpieces - Google Patents
Apparatus for machining workpieces Download PDFInfo
- Publication number
- WO1999019114A1 WO1999019114A1 PCT/GB1998/003030 GB9803030W WO9919114A1 WO 1999019114 A1 WO1999019114 A1 WO 1999019114A1 GB 9803030 W GB9803030 W GB 9803030W WO 9919114 A1 WO9919114 A1 WO 9919114A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- workpiece
- setting component
- outlet guide
- control member
- electrically conducting
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B47/00—Drives or gearings; Equipment therefor
- B24B47/22—Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
- B24B49/10—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving electrical means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/18—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centreless means for supporting, guiding, floating or rotating work
- B24B5/30—Regulating-wheels; Equipment therefor
Definitions
- the present invention relates to apparatus for performing a machining operation on a workpiece and, more particularly, to a means for setting up the apparatus prior to performing a machining operation.
- the invention has particular application to the setting up of a centreless grinding machine to be used for the machining of nuclear fuel pellets .
- a cylindrical workpiece is supported on an inclined work rest which is located between the peripheral surfaces of a control (or regulating) wheel and a grinding wheel .
- a control (or regulating) wheel forces the workpiece downward against the work rest and also against the control wheel .
- an outlet guide is positioned adjacent to the control wheel.
- apparatus for performing a machining operation on a workpiece, the apparatus comprising a control member having a first surface for locating a workpiece during a machining operation, an outlet guide having a second surface for guiding a workpiece away from the control member, the control member and the outlet guide being movable relative to one another to enable alignment of the first and second surfaces, an electrical circuit including an indicating means, and a setting component comprising an electrically conducting portion for use in aligning the first and second surfaces prior to machining a workpiece, wherein relative movement of the control member and the outlet guide enables the electrically conducting portion of the component to complete the electrical circuit and thereby activate the indicating means when the first and second surfaces are in alignment .
- the electrical circuit preferably includes the second surface and relative movement of the control member and outlet guide enables the electrically conducting portion to contact the second surface whereby to complete the electrical circuit.
- the apparatus is adapted to produce cylindrical workpieces by the machining operation, the setting component being in the form of a cylinder having substantially the same diameter as a workpiece to be machined.
- the setting component preferably comprises an electrically insulating portion and an electrically conducting portion.
- the electrically insulating portion and the electrically conducting portion are each in the form of a semi-cylinder.
- the setting component may be formed wholly from an electrically conducting material.
- control member comprises a rotatable control wheel, the said first surface thereof being adapted to impart a rotatable drive to a workpiece.
- the apparatus may further comprise a grinding wheel arranged for rotation about an axis extending in parallel relationship to an axis of rotation of the control wheel, the grinding wheel having a peripheral surface formed with an abrasive material for effecting the machining operation on a workpiece .
- a workpiece support preferably extends between the first surface of the control wheel and the peripheral surface of the grinding wheel, the setting component being so arranged that the electrically insulating portion thereof contacts the workpiece support.
- Adjustment means may be provided for moving the control wheel in a direction perpendicular to the axis of rotation thereof whereby to obtain relative movement of the first and second surfaces.
- adjustment means may be provided for moving the outlet guide whereby to obtain relative movement of the first and second surfaces .
- the indicating means comprises a visual indicator.
- the indicating means may comprise a current meter or may be adapted to provide an audible signal .
- a method of setting up an apparatus for performing a machining operation on a workpiece comprising a control member having a first surface for locating a workpiece during a machining operation, an outlet guide having a second surface for guiding a workpiece away from the control member, an electrical circuit including an indicating means, and a setting component having an electrically conducting portion for use in aligning the first and second surfaces prior to machining the workpiece, the method comprising placing the setting component in contact with the first surface, causing relative movement of the control member and the outlet guide so as to allow the electrical conducting portion of the setting component to contact the second surface and thereby complete the electrical circuit, thereby activating the indicating means.
- Figure 1 is an end elevation of a region of an apparatus for machining a workpiece incorporating a setting component according to one aspect of the invention
- Figure 2 is a plan view of the region of the apparatus shown in Figure 1, and
- Figures 3 and 4 show, respectively, an end view and elevation of the setting component shown in Figures 1 and 2.
- FIG. 1 and 2 a region of an apparatus 2 for machining cylindrical workpieces is shown during a setting up procedure prior to a workpiece machining operation.
- the apparatus 2 is a centreless grinding machine used to grind workpieces in the form of nuclear fuel pellets and is therefore, for safety reasons, housed in a shielded enclosure, such as a glovebox (not shown) .
- Workpieces are rotatably driven by a control wheel 4 having a peripheral surface 6 provided with a frictional driving medium, such as a rubber bonded abrasive material.
- a grinding wheel 8 for machining the workpieces has a peripheral surface 10 formed with a metal bonded abrasive material, the surface 10 extending in parallel relationship with the control wheel surface 6.
- An outlet guide 16 for receiving finished machined workpieces is attached to one end of the support 12 at a location adjacent to an end face of the control wheel 4.
- the outlet guide 16 has a vertical guide surface 18 which, as viewed in Figure 2, forms a tangent with respect to the peripheral surface 6 of the control wheel 4.
- the guide surface 18 extends in alignment with the control wheel surface 6, as viewed in Figure 2, so as to guide the machined workpieces in a straight line from the control wheel 4.
- the apparatus 2 is a centerless grinding machine of the through feed type. Cylindrical workpieces to be ground are given an axial movement by the control wheel 4 and pass between this wheel and the grinding wheel 8 from one side to the other along the support 12 towards the outlet guide 16.
- the grinding wheel 8 forces the workpiece downwards against the support 12 and also against the control wheel 4.
- the latter imparts a uniform rotation to the workpiece, the workpiece having the same peripheral speed as the control wheel 4.
- the axial rate of feed of the workpiece along the support 12 depends on the diameter, speed and inclination of the control wheel 4.
- the guide surface 18 of the outlet guide 16 is in alignment with the peripheral surface 6 of the control wheel 4. If the guide surface 18 at its notional point of tangency with the peripheral surface 6 is too far to the left or right of the peripheral surface
- the setting component 20 is in the form of a right cylinder having the same diameter as the workpiece to be ground and comprises two semi-cylindrical portions 22, 24 of different materials.
- the semi-cylindrical portion 22 is made from an electrically conducting material, for example, stainless steel, and the other semi-cylindrical portion 24 is made from an electrically insulating material, which may be a plastics material.
- a blind hole 26 is drilled into an end face of the conducting portion 22 of the setting component 20 for receiving an electrical wire 28.
- a further blind hole 30 is drilled into the peripheral surface of the conducting portion 22 along an axis which subtends an angle of 30 degrees with respect to the plane containing the junction of the two portions 22, 24.
- a rod handle 32 is received by the hole 30 which extends into the insulating portion 24.
- an electrical circuit is formed by connecting the wire 28 to a power source 34, such as a battery, to a visual indicator, for example, a current meter 36, and to an electrical conducting portion of the outlet guide 16.
- a visual indicator for example, a current meter 36
- the indicator may be replaced by a light source or an alarm capable of emitting an audible signal.
- the control wheel 4 is then moved away from the support 12 until the conducting portion 22 of the setting tool 20 touches the guide surface 18 of the outlet guide 16. This results in the completion of the electrical circuit, which is registered visually by the indicator 34, or by an audio signal. When this occurs, operation of the adjusting mechanism is stopped so as to fix the control wheel 4 in this position.
- control wheel peripheral surface 6 and the outlet guide surface 18 can be judged to within +/- 0.025 mm which is sufficiently accurate for grinding purposes.
- the adjustment mechanism for moving the control wheel 4 is similar to that conventionally used on centerless grinding machines, but is adapted to be controlled at a location outside the enclosure. After removal of the setting component 20, the grinding wheel 8 is moved into its machining position the control wheel 4 and the grinding wheel 8 are set in rotation and workpieces are machined by the grinding wheel as they pass along the support 12.
- the setting component 20 is made wholly from an electrically conducting material.
- the support is made from an insulating material at least in the region which supports the setting component 20. The length of the insulation region is sufficient to extend beyond the face of the setting component 20 remote from the outlet guide 16. The setting up procedure is then carried out as described above.
- the outlet guide 16 is made adjustable rather than the control wheel 4.
- the setting component 20 is located against the peripheral surface 6 of the control wheel 4 and the outlet guide 16 is moved towards the grinding wheel 8.
- the electrical circuit is completed and is visually indicated by the indicator 36, or by an audible signal. This indicates that the surfaces 18 and 6 are in alignment.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Grinding Of Cylindrical And Plane Surfaces (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000515728A JP2001519249A (en) | 1997-10-11 | 1998-10-08 | Equipment for machining workpieces |
US09/509,351 US6368185B1 (en) | 1997-10-11 | 1998-10-08 | Apparatus for machining workpieces |
EP98946595A EP1021272B1 (en) | 1997-10-11 | 1998-10-08 | Apparatus for machining workpieces |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9721511.5 | 1997-10-11 | ||
GBGB9721511.5A GB9721511D0 (en) | 1997-10-11 | 1997-10-11 | Apparatus for machining workpieces |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999019114A1 true WO1999019114A1 (en) | 1999-04-22 |
Family
ID=10820354
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1998/003030 WO1999019114A1 (en) | 1997-10-11 | 1998-10-08 | Apparatus for machining workpieces |
Country Status (5)
Country | Link |
---|---|
US (1) | US6368185B1 (en) |
EP (1) | EP1021272B1 (en) |
JP (1) | JP2001519249A (en) |
GB (1) | GB9721511D0 (en) |
WO (1) | WO1999019114A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012013634A1 (en) * | 2010-07-27 | 2012-02-02 | Areva Nc | Device for inserting, guiding, and removing cylindrical parts, such as nuclear fuel pellets, in a centerless grinder |
US9022836B2 (en) | 2010-07-27 | 2015-05-05 | Areva Nc | Dressing device for a grinding wheel and its use in a centreless nuclear fuel pellet grinder |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2825307B1 (en) * | 2001-06-05 | 2004-11-26 | Cogema | METHOD AND DEVICE FOR GRINDING CYLINDRICAL OBJECTS, IN PARTICULAR NUCLEAR FUEL PELLETS |
DE10139894B4 (en) * | 2001-08-14 | 2009-09-10 | Erwin Junker Maschinenfabrik Gmbh | Method and device for centerless cylindrical grinding |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4167081A (en) * | 1977-07-07 | 1979-09-11 | Westinghouse Electric Corp. | Centerless grinder |
DE3116140A1 (en) * | 1981-04-23 | 1982-11-11 | Batal GmbH, 8560 Lauf | Process for parallel alignment of front and rear regulating-wheel-side workpiece guides |
-
1997
- 1997-10-11 GB GBGB9721511.5A patent/GB9721511D0/en not_active Ceased
-
1998
- 1998-10-08 WO PCT/GB1998/003030 patent/WO1999019114A1/en active IP Right Grant
- 1998-10-08 JP JP2000515728A patent/JP2001519249A/en active Pending
- 1998-10-08 US US09/509,351 patent/US6368185B1/en not_active Expired - Fee Related
- 1998-10-08 EP EP98946595A patent/EP1021272B1/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4167081A (en) * | 1977-07-07 | 1979-09-11 | Westinghouse Electric Corp. | Centerless grinder |
DE3116140A1 (en) * | 1981-04-23 | 1982-11-11 | Batal GmbH, 8560 Lauf | Process for parallel alignment of front and rear regulating-wheel-side workpiece guides |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012013634A1 (en) * | 2010-07-27 | 2012-02-02 | Areva Nc | Device for inserting, guiding, and removing cylindrical parts, such as nuclear fuel pellets, in a centerless grinder |
FR2963265A1 (en) * | 2010-07-27 | 2012-02-03 | Areva Nc | DEVICE FOR THE INTRODUCTION, GUIDANCE AND EVACUATION OF CYLINDRICAL PARTS, SUCH AS NUCLEAR FUEL PELLETS, IN A CENTER-FREE GRINDER |
US9022836B2 (en) | 2010-07-27 | 2015-05-05 | Areva Nc | Dressing device for a grinding wheel and its use in a centreless nuclear fuel pellet grinder |
Also Published As
Publication number | Publication date |
---|---|
GB9721511D0 (en) | 1997-12-10 |
EP1021272A1 (en) | 2000-07-26 |
US6368185B1 (en) | 2002-04-09 |
JP2001519249A (en) | 2001-10-23 |
EP1021272B1 (en) | 2002-11-20 |
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