US3916582A - Cutting-tool grinding method - Google Patents

Cutting-tool grinding method Download PDF

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Publication number
US3916582A
US3916582A US476999A US47699974A US3916582A US 3916582 A US3916582 A US 3916582A US 476999 A US476999 A US 476999A US 47699974 A US47699974 A US 47699974A US 3916582 A US3916582 A US 3916582A
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tool
axis
cutting
grinding
plane
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US476999A
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English (en)
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Marcel Costil
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    • 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
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/02—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters
    • B24B3/06—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters of face or end milling cutters or cutter heads, e.g. of shank type

Definitions

  • the present invention relates to a method of grinding or sharpening cutting-tools of the milling type operating accessorily or continuously by axial thrust or dipcutting, such as milling cutters, reaming cutters, socalled Aviation cutters, flat-bottomed twist drills, blades and other tools, utilized for cutting metals and metal alloys, wood and resinous compounds, this invention also covering a sharpening machine jig for carrying out said method.
  • the various tools mentioned hereinabove which have at least one cutting lip or edge are ground by usingbasically and conventionally a plurality of conventional accessories devised for most grinding machines, the sharpening operation involving a plurality of successive steps with a consequently great loss of time, while giving frequently inaccurate results, when it is desired to obtain at least one cutting lip or edge passing through the centre in at least two planes, the first plane constituting the cutting rake and the other plane the cutting face.
  • This method of grinding tools having at least one cutting edge or lip sharpened by means of a straight-cup grinding wheel in a first cutting-rake plane and in a second cutting-face plane, is characterised in that the tool remains stationary in an tool holder throughout the sharpening operations, said tool holder being arranged in a mounting or jig adapted to be fed longitudinally past the grinding wheel and transversely, i.e.
  • the mounting or jig for carrying out the grinding method set forth hereinabove is characterised essentially in that it comprises a fixed vertical support rigidly secured to a grinding table adapted to travel longitudinally past the grinding wheel and in the transverse direction parallel to the axis of rotation of said wheel, the pivoting supporting thereof having a horizontal pivot shaft housed in said vertical support, an indexing disc rigid with said shaft and adapted to co-act with first means for indexing and locking said shaft in a first desired position of a tool-holding headstock in which the tool to be ground is secured, said pivoting support comprising a longitudinal portion off-set transversely parallel to the pivot shaft and supporting a pivot pin permitting the angular or turning movements of the tool-holding headstock in a plane parallel to said off-set portion, this off-setting being such that the common axis of said tool and tool holder, in all angular positions of said tool holder, and the pivot axis of said pivoting support, converge to a point also contained in the pivot axis of said tool holder,
  • FIG. 1 is a side elevational view showing the cutting end of a two-edged tool, also shown in FIG. 2, to illustrate the limit plane at the centre of the cutting edge;
  • FIG. 2 is an elevational view, in a different plane, of the same tool, to illustrate the cutting-rake plane and the cutting-face plane, respectively, thereof;
  • FIG. 3 illustrates diagrammatically in elevation th mounting or jig according to this invention, mounted on a grinder table, in the position for grinding the cutting face plane;
  • FIG. 4 is a side elevational view of the mounting or jig of FIG. 3, as seen in the direction of the arrow IV;
  • FIG. 5 illustrates the end of a worn tool before commencing the grinding operation
  • FIG. 6 is a front elevational view of the straight-cup grinding wheel, with the tool -to be sharpened, in the position for grinding the cutting-rake plane, of which 3 FIG. 7 is a side view;
  • FIG. 8 illustrates the same front elevational view with the tool positioned for forming the cutting-face plane, of which FIG. 9 is a side view, and
  • FIG. 10 is a front view showing the tool positioned for grinding the plane bounding the cutting edge at the centre, FIG. 11 being a side elevational view and FIG. 12 a plane view thereof.
  • a tool sharpened according to the method of this invention and comprising for example two flutes 1 and 2 has a first plane 3 constituting the cutting rake, the rake angle being designated by the reference letter d and the cutting lip by the reference numeral 4; another cutting face plane 5 passes through the centre C of the tool axis YY, and a third plane 6 constitutes the limit at said centre C of the cutting lip 4.
  • FIGS. 3 and 4 there is shown diagrammatically a mounting or jig 7 secured to the table 8 of a grinding machine comprising a straight-cup grinding wheel 9.
  • the table 8 and its jig 7 can be moved longitudinally past the grinding wheel 9, as shown by the arrows f, or transversely, parallel to the axis of rotation of said grinding "wheel.
  • the jig comprises a fixed vertical support 10in which the horizontal shaft 11 of a pivoting support 12 is housed, the median axis XX of shaft 11 lying in coextensive relationship to the horizontal median plane of grinding wheel 9.
  • the pivoting support 12 comprises a plate 13 off-set laterally, parallel to the shaft 11, in which a pivot pin 14 is secured to permit the angular pivotal movements, parallel to the plane of plate 13, of the head 15 of the tool-holding headstock 16 in which the tool 17 to be ground or sharpened is secured.
  • the plate 13 has formed therein, in the vicinity of its edge opposite said pivot pin 14, an arcuate slot 18 covering about 45 and centered to the axis ll of pivot pin 14.
  • Indexing means illustrated diagrammatically at 19 permit of detent-positioning the tool in the headstock in any desired position.
  • Means 27 are also provided for locking the head 15 in any desired angular position.
  • An indexingdisc 20 of an indexing system is rigid with the pivot shaft 11 and comprises a number of notches 21,, 21 21,, properly distributed along the outer periphery of said disc 20.
  • a catch 22 adapted to lock the disc 22 in the selected angular position by engaging one of said notches 21 is carried by one end of a two-armed lever 23 fulcrumed by means of a pivot pin 24 to said fixed support 9, said pin 24 extending at right angles to the shaft 11 of pivoting support 12.
  • the other end of lever 23 carries a released knob 25 and the lever 23 is constantly urged to its detent-positioning position, i.e. to the position in which the catch 22 engages one of the notches 21, by a coil compression spring underlying said knob 25 in order to lock the pivoting support 12 in the selected position.
  • the first notch 21 corresponds to the pivoting support 12 position in which the tool face 3 is ground to obtain its face 3, i.e. the cutting rake.
  • the second notch 21 there corresponds the tool position for sharpening the plane 5 of the cutting face, this notch 21, being spaced angularly from notch 21, by an angle of, say, -d (d being the desired rake angle) in the forward direction as shown by the arrow f, of FIG. 4.
  • the third notch 21, corresponds to the position necessary for grinding a plane 6 limiting the cutting lip 4 at the centre C.
  • a boss 28 formed on the pivoting support 12 and having a face extending in a vertical plane containing the pivot axis XX permits of determining the position of this axis in relation to the grinding wheel 9.
  • This boss 28 may advantageously comprise a grinding-wheel truing diamond and permits of gauging a stop (not shown) for the transverse or cross-slide of the table 8, to limit the stroke thereof.
  • the device operates as follows:
  • the tool 17 to be sharpened or ground is inserted into the tool holder 16 so that the worn or untrue portion 17a of the tool projects by a distance m from the point C of intersection between the axes, which is to determine the future centre C of the sharpened or ground tool (FIG. 5).
  • a first operation for example grinding the cutting rake face 3.
  • the catch 22 is firstly released by depressing the knob 25 of the indexing or detentpositioning device while compressing the spring 26. Then the disc 20 is rotated in the direction of the arrow f, (FIG. 4) until the notch 21, registers with catch 22.
  • the catch 22 due to the expansion of spring 26 reacting against the lever 23, is caused to engage the notch 21, and the pivoting support 12 is thus locked.
  • the axis YY of tool 17 is caused to coincide with the 0 position of graduated segment b by pivoting the headstock 16 about the pivot pin 14.
  • the tool 17 is positioned as shown in FIGS.
  • the cutting face 5 is sharpened by bringing the tool end firstly into the plane of the operative front face 9a of'grinding wheel 9, and subsequently moving the jig 7 along the wheel 9.
  • angle e is to determine a sufiicient surface area of contact with the grinding wheel, said area decreasing towards the tool centre.
  • the last operation consists in grinding a face 6 bounding the cutting lip or edge centrally of the tool tip, the intersection of said face 6 with the face 3 obtained during the first operation forming a desired angle with the cutting lip 4, of which the apex is coincident with the centre C
  • the notch 21 a of indexing disc 20 is brought in radial alignment with this catch as already described hereinabove.
  • the disc 20 is rotated through the desired angular value in the direction of the arrow f of FIG. 4.
  • the angular position b of the tool axis on the pivoting support approximate that of the second operation described hereinabove. As illustrated in FIGS.
  • the tool 17 is thus positioned in the median horizontal plane A-A' of the grinding wheel, so as to form with the vertical plane containing the operative face 9a of grinding wheel 9 a predetermined angle f corresponding to the position of plane YY' of tool 17 with respect to said face 9a.
  • the tool end is caused to engage the operative face of the grinding wheel and the jig 7 is fed longitudinally to grind the face 6.
  • a stop (not shown) carried by table 8 limits this travel.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
US476999A 1973-06-20 1974-06-06 Cutting-tool grinding method Expired - Lifetime US3916582A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7322552A FR2234749A5 (xx) 1973-06-20 1973-06-20

Publications (1)

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US3916582A true US3916582A (en) 1975-11-04

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US476999A Expired - Lifetime US3916582A (en) 1973-06-20 1974-06-06 Cutting-tool grinding method

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US (1) US3916582A (xx)
JP (1) JPS5342159B2 (xx)
AU (1) AU468343B2 (xx)
BR (1) BR7404907D0 (xx)
DD (1) DD114024A5 (xx)
DE (1) DE2428426C3 (xx)
ES (1) ES427406A1 (xx)
FR (1) FR2234749A5 (xx)
GB (1) GB1426678A (xx)
IT (1) IT1015204B (xx)
PL (1) PL90744B1 (xx)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287686A (en) * 1979-03-27 1981-09-08 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Clamping apparatus for clamping cutter blades of a gear cutting machine at a grinding machine
US4829861A (en) * 1987-11-10 1989-05-16 Hardinge Brothers, Inc. Headstock assembly for a chucker and bar machine
US5353552A (en) * 1990-11-05 1994-10-11 Megatool, Inc. Root-strength drill bit and method of making
US6306017B1 (en) * 1998-11-30 2001-10-23 WEINGäRTNER MASCHINENBAU GESELLSCHAFT M.B.H. Method and machining tool for producing helically profiled workpieces
CN103084935A (zh) * 2012-12-19 2013-05-08 西南铝业（集团）有限责任公司 铣刀度数的磨制方法、成型铣刀和度数铣刀
RU2493952C1 (ru) * 2012-04-04 2013-09-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный технологический университет "СТАНКИН" (ФГБОУ ВПО МГТУ "СТАНКИН") Способ заточки сверл
US8708774B2 (en) * 2011-06-03 2014-04-29 Nordutensili S.R.L. Automatic grinding machine for end mills for wood, programmable with optical reading of the geometric characteristics and computerized shapening
US9085033B2 (en) 2009-08-27 2015-07-21 Kennametal Inc. Drilling tool
CN105364647A (zh) * 2015-11-24 2016-03-02 江门市江海区杰能机电科技有限公司 一种具有稳定受力的磨刀机
CN105364642A (zh) * 2015-11-24 2016-03-02 江门市江海区杰能机电科技有限公司 一种可有效减小砂轮塑性变形的磨刀机
CN105458842A (zh) * 2015-11-27 2016-04-06 贵州西南工具(集团)有限公司 一种解决小刃径合金刀刃口微小崩刃的方法
RU2709553C1 (ru) * 2019-10-02 2019-12-18 Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" (ФГБОУ ВО "КубГТУ") Способ заточки шнекового сверла

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5011342A (en) * 1988-03-14 1991-04-30 501 Greenfield Industries, Inc. Twist drill
JPH0631939U (ja) * 1992-09-30 1994-04-26 株式会社中防鉄工所 切削工具のエンド刃ギャッシュ研削装置
AUPM534094A0 (en) * 1994-04-29 1994-05-19 Parke, Terrence James Sharpening apparatus
DE19546362C2 (de) * 1994-12-12 2002-10-24 Deckel Michael Feinmech Gmbh Werkzeugschleifmaschine
CN102211303B (zh) * 2011-04-09 2012-10-03 张家港市普天机械制造有限公司 双刀排装夹装置

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2328549A (en) * 1940-07-29 1943-09-07 United Shoe Machinery Corp Method of grinding twist drills and machine for same
US3073076A (en) * 1960-03-21 1963-01-15 William H Field Co Inc Radius cutter grinding machine
US3094822A (en) * 1960-11-14 1963-06-25 Charles T Breitenstein Spiral grinding fixture
US3117399A (en) * 1961-08-08 1964-01-14 Beare Berniece Method and apparatus for tool grinding
US3156074A (en) * 1961-08-07 1964-11-10 George M Baltz Process and apparatus for grinding a shell milling cutter
US3448545A (en) * 1965-09-23 1969-06-10 Mini Ind Constructillor Method of and means for sharpening twist drills
US3626436A (en) * 1966-07-19 1971-12-07 Renault Machine for sharpening twist drills
US3626645A (en) * 1968-10-18 1971-12-14 Renault Method of sharpening twist drills
US3656264A (en) * 1970-04-24 1972-04-18 Radial Lip Machine Inc Method of grinding drills
US3680263A (en) * 1970-06-03 1972-08-01 Huffman S E Corp Method and apparatus for grinding end cutting tools

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2866302A (en) * 1955-06-16 1958-12-30 Christen & Co A G Machine for sharpening drills

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2328549A (en) * 1940-07-29 1943-09-07 United Shoe Machinery Corp Method of grinding twist drills and machine for same
US3073076A (en) * 1960-03-21 1963-01-15 William H Field Co Inc Radius cutter grinding machine
US3094822A (en) * 1960-11-14 1963-06-25 Charles T Breitenstein Spiral grinding fixture
US3156074A (en) * 1961-08-07 1964-11-10 George M Baltz Process and apparatus for grinding a shell milling cutter
US3117399A (en) * 1961-08-08 1964-01-14 Beare Berniece Method and apparatus for tool grinding
US3448545A (en) * 1965-09-23 1969-06-10 Mini Ind Constructillor Method of and means for sharpening twist drills
US3626436A (en) * 1966-07-19 1971-12-07 Renault Machine for sharpening twist drills
US3626645A (en) * 1968-10-18 1971-12-14 Renault Method of sharpening twist drills
US3656264A (en) * 1970-04-24 1972-04-18 Radial Lip Machine Inc Method of grinding drills
US3680263A (en) * 1970-06-03 1972-08-01 Huffman S E Corp Method and apparatus for grinding end cutting tools

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4287686A (en) * 1979-03-27 1981-09-08 Werkzeugmaschinenfabrik Oerlikon-Buhrle Ag Clamping apparatus for clamping cutter blades of a gear cutting machine at a grinding machine
US4829861A (en) * 1987-11-10 1989-05-16 Hardinge Brothers, Inc. Headstock assembly for a chucker and bar machine
US5353552A (en) * 1990-11-05 1994-10-11 Megatool, Inc. Root-strength drill bit and method of making
US6306017B1 (en) * 1998-11-30 2001-10-23 WEINGäRTNER MASCHINENBAU GESELLSCHAFT M.B.H. Method and machining tool for producing helically profiled workpieces
US9085033B2 (en) 2009-08-27 2015-07-21 Kennametal Inc. Drilling tool
US8708774B2 (en) * 2011-06-03 2014-04-29 Nordutensili S.R.L. Automatic grinding machine for end mills for wood, programmable with optical reading of the geometric characteristics and computerized shapening
RU2493952C1 (ru) * 2012-04-04 2013-09-27 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Московский государственный технологический университет "СТАНКИН" (ФГБОУ ВПО МГТУ "СТАНКИН") Способ заточки сверл
CN103084935B (zh) * 2012-12-19 2015-02-18 西南铝业（集团）有限责任公司 铣刀度数的磨制方法
CN103084935A (zh) * 2012-12-19 2013-05-08 西南铝业（集团）有限责任公司 铣刀度数的磨制方法、成型铣刀和度数铣刀
CN105364647A (zh) * 2015-11-24 2016-03-02 江门市江海区杰能机电科技有限公司 一种具有稳定受力的磨刀机
CN105364642A (zh) * 2015-11-24 2016-03-02 江门市江海区杰能机电科技有限公司 一种可有效减小砂轮塑性变形的磨刀机
CN105458842A (zh) * 2015-11-27 2016-04-06 贵州西南工具(集团)有限公司 一种解决小刃径合金刀刃口微小崩刃的方法
RU2709553C1 (ru) * 2019-10-02 2019-12-18 Федеральное государственное бюджетное образовательное учреждение высшего образования "Кубанский государственный технологический университет" (ФГБОУ ВО "КубГТУ") Способ заточки шнекового сверла

Also Published As

Publication number Publication date
IT1015204B (it) 1977-05-10
GB1426678A (en) 1976-03-03
FR2234749A5 (xx) 1975-01-17
DE2428426B2 (de) 1979-08-23
DE2428426C3 (de) 1980-05-08
JPS5342159B2 (xx) 1978-11-09
PL90744B1 (xx) 1977-01-31
DE2428426A1 (de) 1975-01-09
JPS5037090A (xx) 1975-04-07
AU6987074A (en) 1975-12-11
DD114024A5 (xx) 1975-07-12
ES427406A1 (es) 1976-09-16
AU468343B2 (en) 1976-01-08
BR7404907D0 (pt) 1975-01-07

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