GB2195928A - Method of cutting a surface of a work-piece - Google Patents

Method of cutting a surface of a work-piece Download PDF

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Publication number
GB2195928A
GB2195928A GB08624517A GB8624517A GB2195928A GB 2195928 A GB2195928 A GB 2195928A GB 08624517 A GB08624517 A GB 08624517A GB 8624517 A GB8624517 A GB 8624517A GB 2195928 A GB2195928 A GB 2195928A
Authority
GB
United Kingdom
Prior art keywords
cutting
tool
work
piece
cutting tool
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Withdrawn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
GB08624517A
Other versions
GB8624517D0 (en
Inventor
Michael John Dent
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.)
OPTICAL HOLDINGS Ltd
Original Assignee
OPTICAL HOLDINGS 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 OPTICAL HOLDINGS Ltd filed Critical OPTICAL HOLDINGS Ltd
Priority to GB08624517A priority Critical patent/GB2195928A/en
Publication of GB8624517D0 publication Critical patent/GB8624517D0/en
Publication of GB2195928A publication Critical patent/GB2195928A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B27/00—Tools for turning or boring machines; Tools of a similar kind in general; Accessories therefor
    • B23B27/14—Cutting tools of which the bits or tips or cutting inserts are of special material
    • B23B27/18—Cutting tools of which the bits or tips or cutting inserts are of special material with cutting bits or tips or cutting inserts rigidly mounted, e.g. by brazing
    • B23B27/20—Cutting tools of which the bits or tips or cutting inserts are of special material with cutting bits or tips or cutting inserts rigidly mounted, e.g. by brazing with diamond bits or cutting inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B5/00—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor
    • B23B5/36—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning specially-shaped surfaces by making use of relative movement of the tool and work produced by geometrical mechanisms, i.e. forming-lathes
    • B23B5/40—Turning-machines or devices specially adapted for particular work; Accessories specially adapted therefor for turning specially-shaped surfaces by making use of relative movement of the tool and work produced by geometrical mechanisms, i.e. forming-lathes for turning spherical surfaces inside or outside

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Turning (AREA)

Abstract

In a method of cutting a surface (11) of a workpiece (10) comprising contacting the surface (11) with a cutting tool (1, 2) while producing relative movement between the workpiece (10) and the tool (1, 2), the tool (1, 2) has at least two cutting points (3, 4) which contact the surface (11) of the workpiece (10) and provide successive cuts to mutually different depths during one passage of the tool (1, 2) over the surface (11). <IMAGE>

Description

SPECIFICATION Method of cutting a surface of a workpiece This invention relates to a method of cutting a surface of a work-piece, and to a cutting tool for use in such method.
In the manufacture of contact lenses a surface of a plastics material blank which constitutes a work-piece, is cut by means of a cutting tool, generally having a diamond cutting head, by contacting the surface with the tool while producing relative movement between the blank and the tool.
Known cutting tools for use in such a method of manufacture have a single cutting point which contacts the surface to be cut, and thus it is necessary to make a plurality of successive passes of the tool over the surface in order to obtain a required shape and finish, a first cut being, for example, a bulk cut in which a reletively large amount of material is cut from the surface, with a subsequent cut being a fine cut which produces a required finish on the surface.
According to this invention there is provided a method of cutting a surface of a work-piece comprising contacting the surface with a cutting tool while producing relative movement between the work-piece and the cutting tool, in which the cutting tool has at least two cutting points which contact the surface of the work-piece and provide successive cuts to mutually different depths in the surface during one passage of the cutting tool over the surface.
The method of this invention has the advantage that fewer passes of the cutting tool over the surface of the work-piece are required to obtain a required product.
Further, the use of more than one cutting point on the tool increases the life of the tool as compared with a single point tool with which the same cutting point must be used for all the necessary successive cuts.
This invention will now be described by way of example with reference to the drawing, in which: Figure 1 is a diagramnatic illustration of the working head of a diamond cutting tool for use in carrying out the method of the invention; and Figure 2 illustrates the use of the tool of Figure 1.
The tool shown in Figure 1 comprises an arm 1 of, for example, metal, carrying a working head 2 made of a diamond. The diamond head 2 is shaped to provide two cutting points 3 and 4 located as shown, at mutually different distances from the remote end (not shown) of the arm 1.
As shown in Figure 2, when the tool of Figure 1 is pivoted in the direction of arrow A about a point X relative to a surface 11 of a work-piece 10, the leading cutting point 3 gives a bulk cut and cuts the surface a relatively large depth D while the following cutting point 4 gives a fine cut and cuts the new surface a further relatively small depth d.
By rotating the work-piece 10 about an axis Y perpendicular to the pivot axis X of the tool the tool is caused to cut a concave surface on the work-piece.
Otherwise the relative movement between the tool and the work-piece can be such as to produce a convex surface on the work-piece, in known manner.
1. A method of cutting a surface of a workpiece comprising contacting the surface with a cutting tool while producing relative movement between the work-piece and the cutting tool, in which the cutting tool has at least two cutting points which contact the surface of the work-piece and provide successive cuts to mutually different depths in the surface during one passage of the cutting tool over the surface.
2. A method as claimed in Claim 1, in which the cutting tool has two cutting points, the cutting point leading in the direction of movement of the cutting tool over the surface performing a bulk cut on the surface while the other cutting point subsequently performs a fine cut on the surface.
3. A method as claimed in Claim 1 or Claim 2, in which the cutting tool pivots about an axis relative to the work-piece while the workpiece rotates about an axis perpendicular to the pivot axis of the cutting tool.
4. A method of manufacturing a contact lens, as claimed in any preceding claim, in which the work-piece is a contact lens blank and the cutting tool is a diamond.
5. A method of cutting a surface of a workpiece, substantially as hereinbefore described with reference to the drawings.
6. A cutting tool for use in a method as claimed in any preceding claim, comprising a work head mounted on one end of an arm, the head providing two or more cutting points arranged at mutually different distances from the remote end of the arm.
7. A cutting tool substantially as hereinbefore described with reference to the drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Method of cutting a surface of a workpiece This invention relates to a method of cutting a surface of a work-piece, and to a cutting tool for use in such method. In the manufacture of contact lenses a surface of a plastics material blank which constitutes a work-piece, is cut by means of a cutting tool, generally having a diamond cutting head, by contacting the surface with the tool while producing relative movement between the blank and the tool. Known cutting tools for use in such a method of manufacture have a single cutting point which contacts the surface to be cut, and thus it is necessary to make a plurality of successive passes of the tool over the surface in order to obtain a required shape and finish, a first cut being, for example, a bulk cut in which a reletively large amount of material is cut from the surface, with a subsequent cut being a fine cut which produces a required finish on the surface. According to this invention there is provided a method of cutting a surface of a work-piece comprising contacting the surface with a cutting tool while producing relative movement between the work-piece and the cutting tool, in which the cutting tool has at least two cutting points which contact the surface of the work-piece and provide successive cuts to mutually different depths in the surface during one passage of the cutting tool over the surface. The method of this invention has the advantage that fewer passes of the cutting tool over the surface of the work-piece are required to obtain a required product. Further, the use of more than one cutting point on the tool increases the life of the tool as compared with a single point tool with which the same cutting point must be used for all the necessary successive cuts. This invention will now be described by way of example with reference to the drawing, in which: Figure 1 is a diagramnatic illustration of the working head of a diamond cutting tool for use in carrying out the method of the invention; and Figure 2 illustrates the use of the tool of Figure 1. The tool shown in Figure 1 comprises an arm 1 of, for example, metal, carrying a working head 2 made of a diamond. The diamond head 2 is shaped to provide two cutting points 3 and 4 located as shown, at mutually different distances from the remote end (not shown) of the arm 1. As shown in Figure 2, when the tool of Figure 1 is pivoted in the direction of arrow A about a point X relative to a surface 11 of a work-piece 10, the leading cutting point 3 gives a bulk cut and cuts the surface a relatively large depth D while the following cutting point 4 gives a fine cut and cuts the new surface a further relatively small depth d. By rotating the work-piece 10 about an axis Y perpendicular to the pivot axis X of the tool the tool is caused to cut a concave surface on the work-piece. Otherwise the relative movement between the tool and the work-piece can be such as to produce a convex surface on the work-piece, in known manner. CLAIMS
1. A method of cutting a surface of a workpiece comprising contacting the surface with a cutting tool while producing relative movement between the work-piece and the cutting tool, in which the cutting tool has at least two cutting points which contact the surface of the work-piece and provide successive cuts to mutually different depths in the surface during one passage of the cutting tool over the surface.
2. A method as claimed in Claim 1, in which the cutting tool has two cutting points, the cutting point leading in the direction of movement of the cutting tool over the surface performing a bulk cut on the surface while the other cutting point subsequently performs a fine cut on the surface.
3. A method as claimed in Claim 1 or Claim 2, in which the cutting tool pivots about an axis relative to the work-piece while the workpiece rotates about an axis perpendicular to the pivot axis of the cutting tool.
4. A method of manufacturing a contact lens, as claimed in any preceding claim, in which the work-piece is a contact lens blank and the cutting tool is a diamond.
5. A method of cutting a surface of a workpiece, substantially as hereinbefore described with reference to the drawings.
6. A cutting tool for use in a method as claimed in any preceding claim, comprising a work head mounted on one end of an arm, the head providing two or more cutting points arranged at mutually different distances from the remote end of the arm.
7. A cutting tool substantially as hereinbefore described with reference to the drawing.
GB08624517A 1986-10-13 1986-10-13 Method of cutting a surface of a work-piece Withdrawn GB2195928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08624517A GB2195928A (en) 1986-10-13 1986-10-13 Method of cutting a surface of a work-piece

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08624517A GB2195928A (en) 1986-10-13 1986-10-13 Method of cutting a surface of a work-piece

Publications (2)

Publication Number Publication Date
GB8624517D0 GB8624517D0 (en) 1986-11-19
GB2195928A true GB2195928A (en) 1988-04-20

Family

ID=10605666

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08624517A Withdrawn GB2195928A (en) 1986-10-13 1986-10-13 Method of cutting a surface of a work-piece

Country Status (1)

Country Link
GB (1) GB2195928A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006011300B3 (en) * 2006-03-11 2007-09-27 Felsomat Gmbh & Co. Kg Turning machine for motor vehicle transmission, has tool blade provided at holder and comprising circular arc-shaped section, where radius of curvature of section corresponds to radial distance of blade from swivel axis
CN104815997A (en) * 2015-04-17 2015-08-05 柳州蔚园塑料彩印包装有限责任公司 Boring method for small-hole plastic part
DE202016103064U1 (en) 2015-02-24 2016-06-28 Vandurit GmbH Hartmetall und Diamantwerkzeuge Device for machining a rotating workpiece
CN106984834A (en) * 2017-05-23 2017-07-28 句容通源电器有限公司 A kind of spherical turning processing unit (plant)
EP3246125A1 (en) 2016-05-17 2017-11-22 Vandurit GmbH Hartmetall und Diamantwerkzeuge Pivoting tool unit for a rotating machine

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1285169A (en) * 1970-03-16 1972-08-09 Orbit Beratungsgesellschaft M Scalping machine
GB1474361A (en) * 1975-01-23 1977-05-25 Sandco Ltd Cutting inserts and a rotary milling cutter therefor
GB2059824A (en) * 1979-10-11 1981-04-29 Hegenscheidt Gmbh Wilhelm Cutting tool
GB2104421A (en) * 1981-08-27 1983-03-09 Komet Stahlhalter Werkzeug A turnround cutting plate for lathe tools

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1285169A (en) * 1970-03-16 1972-08-09 Orbit Beratungsgesellschaft M Scalping machine
GB1474361A (en) * 1975-01-23 1977-05-25 Sandco Ltd Cutting inserts and a rotary milling cutter therefor
GB2059824A (en) * 1979-10-11 1981-04-29 Hegenscheidt Gmbh Wilhelm Cutting tool
GB2104421A (en) * 1981-08-27 1983-03-09 Komet Stahlhalter Werkzeug A turnround cutting plate for lathe tools

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006011300B3 (en) * 2006-03-11 2007-09-27 Felsomat Gmbh & Co. Kg Turning machine for motor vehicle transmission, has tool blade provided at holder and comprising circular arc-shaped section, where radius of curvature of section corresponds to radial distance of blade from swivel axis
DE202016103064U1 (en) 2015-02-24 2016-06-28 Vandurit GmbH Hartmetall und Diamantwerkzeuge Device for machining a rotating workpiece
WO2016135005A1 (en) 2015-02-24 2016-09-01 Vandurit GmbH Hartmetall und Diamantwerkzeuge Device, method, and cutting plate for machining a rotating workpiece
US10493534B2 (en) 2015-02-24 2019-12-03 Vandurit GmbH Hartmetall und Diamantwerkzeuge Device, method, and cutting plate for machining a rotating workpiece
CN104815997A (en) * 2015-04-17 2015-08-05 柳州蔚园塑料彩印包装有限责任公司 Boring method for small-hole plastic part
CN104815997B (en) * 2015-04-17 2017-04-12 柳州蔚园塑料彩印包装有限责任公司 Boring method for small-hole plastic part
EP3246125A1 (en) 2016-05-17 2017-11-22 Vandurit GmbH Hartmetall und Diamantwerkzeuge Pivoting tool unit for a rotating machine
CN106984834A (en) * 2017-05-23 2017-07-28 句容通源电器有限公司 A kind of spherical turning processing unit (plant)

Also Published As

Publication number Publication date
GB8624517D0 (en) 1986-11-19

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Legal Events

Date Code Title Description
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)