US3811234A - Method of forming workpieces by abrading - Google Patents
Method of forming workpieces by abrading Download PDFInfo
- Publication number
- US3811234A US3811234A US00298940A US29894072A US3811234A US 3811234 A US3811234 A US 3811234A US 00298940 A US00298940 A US 00298940A US 29894072 A US29894072 A US 29894072A US 3811234 A US3811234 A US 3811234A
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- mounting portion
- cylindrical
- cylindrical mounting
- diameter
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- 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
- B23P15/28—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools
- B23P15/32—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass cutting tools twist-drills
Definitions
- Tools of the type described are commonly formed by machining a piece of tool steel to the rough shape desired.
- the flat is also machined into the cylindrical mounting portion.
- the tool is then hardened.
- at least the cylindrical mounting portion must be ground to a precise diameter so that it will closely fit within a chuck.
- the cylindrical mounting portion was rough ground oversize by centerless grinding.
- the flat in the cylindrical mounting portion presents a peripheral discontinuity in the cylindrical'rnounting portion. During centerless grinding, this peripheral discontinuity causes uneven pressure against the peripheral surface of the cylindrical mounting portion. For example, when the flat is in the area of the work rest blade on the centerless grinder, the pressure against the cylindrical mounting portion on opposite sides of the flat is greater than when the flat 'is away from the work rest blade.
- thecylindrical mounting portion of the tool was rough ground oversize by centerless grinding because this is the most economical and rapid way of grinding a cylindrical workpiece to a rough diameter.
- the too] then had to be mounted in a cylindrical grinder between centers for finish grinding the cylindrical mounting portion to a predetermined finish diameter.
- FIG. 1 is an elevational view showing a prior art type of tool
- FIG. 2 is a plan view looking generally in the direction of arrows 2-2 of FIG. 1;
- FIG. 3 is an elevational view of an improved tool constructed in accordance with the present invention.
- FIG. 4 is a view similar to FIG. 3 and showing the tool after a further step in the manufacturing procedure
- FIG. 5 is a plan view looking generally in the direction of arrows 5-5 of FIG. 4;
- FIG. 6 is a side elevational view showing the improved too] of the present invention mounted in a centerless grinder.
- FIG. 7 is a plan view looking generally in the direction of arrows 7-7 of FIG. 6.
- FIG. 1 shows a prior art type of cutting tool A.
- Tool A is formed from tool steel and includes a cylindrical mounting portion 12. Cylindrical mounting portion 12 terminates at spaced-apart opposite end portions 14 and 16. Cutting edges for a drill, end mill or the like are adapted to be formed on opposite end portions 18 and 20 of tool A.
- a fiat surface 22 is formed into cylindrical mounting portion 12.
- Flat surface 22 has opposite arcuate sides 26 and 28. Sloping shoulders 32 and 34 slope from sides 26 and 28 down to flat surface 22.
- Flat surface 22 lies in a plane extending parallel to'the longitudinal axis of cylindrical mounting portion 12.
- Flat surface 22 is formed into cylindrical portion 12 so that it terminates short of the longitudinal axis of tool 12. Therefore, spaced-apart opposite edges 36 and 38 of flat surface 22 extend over an arc of around l50 on the outer pe- 3 ripheral surface of cylindrical mounting portion 12. it will be recognized that this are is immaterial and flat surface 22 may be formed to any desirable depth into cylindrical mounting portion 12 as long as sufficient material remains to insure strength and rigidity.
- the backup wheel is bearing across the entire outer periphery of cylindrical mounting portion 12 between edges 14 and 16 op posite flat surface 22. This causes a greater pressure to be exerted on the peripheral surface portions between edges 14 and 26, and 16 and 28. When flat surface 22 is rotating past the backup wheel, the pressure .of the backup wheel is greater on those peripheral surfaces extending between edges 14 and 26, and 16 and 28. However, the pressure of the grinding wheel is uniform across the entire peripheral surface of cylindrical.
- a cutting tool B is machined from tool steel to the rough shape shown in FIG. 3.
- Tool B has a cylindrical mounting portion C which actually comprises two spaced-apart cylindrical mounting portions 40 and 42.
- Cylindrical mounting portion C has longitudinally-spaced-apartopposite edges 44 and 46.
- Opposite end portions 48 and 50 on tool B are adapted to be formed into cutting edges or the like.
- a cylindrical peripheral recess D is machined into cylindrical mounting portion C.
- Peripheral recess D is preferably centrally located between opposite ends 44 and 46 of cylindrical mounting portion C.
- Peripheral recess'D has spaced-apart opposite edges 52 and 54 which also respectively define opposite edges for cylindrical mounting portions 40 and 42.
- Peripheral recess portion D has a diameter only slightly less than the outer diameter of cylindrical mounting portion C so that cylindrical mounting portion C retains its strength while providing peripheral recess D with a peripheral surface which is below the outer peripheral surface of cylindrical mounting portion C.
- Flat surface 60 is then formed in peripheral recess portion D.
- Flat surface 60 has spaced-apart arcuate edges 62 and 64 which are also spaced inwardly from edges 52 and 54 of peripheral recess D.
- Shoulders 66 and 68 slope inwardly toward one another from edges 62 and 64 to intersect flat surface 60.
- Flat surface 60 is substantially centrally located between opposite edges or shoulders 52 and 54 of peripheral recess D, and also substantially centrally located between opposite ends 44 and 46 of cylindrical mounting portion C.
- opposite portions 48 and 50 of tool B define cutting body portions which have a diameter substantially less than the diameter of cylindrical mounting portion C.
- Cutting edges generally indicated at 70 and 72 may be formed on cutting body portions 48 and 50. Cutting edges for an end mill are shown. However, it will be recognized that many different types of cutting edges or tool edges may be formed on opposite body portions 48 and 50.
- flat surface 60 lies in a plane extending parallel to the longitudinal axis of tool B. Flat surface 60 is also machined into peripheral recess portion D so that its opposite edges 74 and 76' extend over an arc of around l50 on the outer periphery of peripheral recess D. It will be recognized that flat surface 60 may be machined into peripheral recess D to extend over any desirable arc. It is simply necessary that flat surface 60 be sufiiciently wide so that a set screw will have adequate bearing thereagainst to firmly hold cylindrical mounting portion C within a chuck.
- body 50 may be omitted so that cylindrical mounting portion C would terminate at end 46. Cylindrical mounting por tion C would then simply extend between opposite ends 44 and 46, and have one body 48 extending therefrom. End 46 would then simply be flat.
- a tool having working ends at both of the opposite ends thereof is described merely for simplicity of description. However, it will be appreciated that the invention also covers cutting tools and formation thereof when only one working end is provided. 4
- cylindrical mounting portion C includes two spaced-apart substantially perfectly cylindrical surfaces 40 and 42. Peripheral recess D provides a discontinuity around the entire peripheral surface of cylindrical mounting portion C. Therefore,
- Tool B may then be positioned in a plunge-type centerless grinder including a rotatable cylindrical grinding wheel E and a rotatable cylindrical backup wheel F.
- a work rest blade G positioned between grinding wheel E and backup wheel F below the axes of rotation thereof provides an upwardly facing surface 80 on which tool B rests.
- Backup wheel F forces tool B substantially constant. This makes it possible to centerless grind cylindrical portions 40 and 42 to a very precise diameter within very close tolerances bycenterless grinding.
- grinding wheel E and backup wheel F have a width to extend completely across cylindrical mounting portion C between opposite ends 44 and 46 thereof.
- said workpiece comprises a tool having a cutting body portion integral with said mounting portion, and further including the step of forming said cutting body portion to a diameter less than the diameter of said mounting portion and forming cutting edges on said body portion prior to said step of hardening said workpiece.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
A peripheral recess is formed in a cylindrical mounting portion of a metal workpiece. A flat is then formed in the peripheral recess. A set screw is adapted to bear against the flat when the mounting portion is positioned in a chuck. The workpiece is then hardened. The cylindrical mounting portion is then finished to a predetermined diameter by centerless grinding.
Description
United States Patent 1191 111 3,811,234 Soares, Jr. May 21, 1974 [54] METHOD OF FORMING WORKPIECES BY 3,626,644 12/1971 Cupler 51/288 ABRADING 3,298,140 1/1967 Enyeart.... 51/103 R 3,732,648 5/1973 Schaller 51/103 R [75] Inventor: Edward W. Scares, .lr., New
Bedford, Mass.
[73] Assignee: Gulf & Western Precision Primary Examiner-Donald G; Kelly E i i C Mancheser, Attorney, Agent, or Firm-Charles l. Sherman Mass.
[22] Filed: Oct. 19, 1972 [21] Appl. No.: 298,940 [57] ABSTRACT [52] U.S. Cl...-. 51/323, 51/288, 51/289 R, A P p a r s is m d in a ylindrical mount- 51/327 ing portion of a metal workpiece. A flat is then formed [51] Int. Cl. B24b 3/06, B24b 5/22 in the peripheral recess. A set screw is adapted to bear 58 Field of Search 51/103 R, 288, 289 R, 323; against the flat when the mounting Portion is P 51 /327 tioned in a chuck. The workpiece is then hardened. The cylindrical mounting portion is then finished to a [56] Referen s Cit d predetermined diameter by centerless grinding.
UNITED STATES PATENTS 2.718.689 9/1955 Mason 51/288 UX 6 Claims, 7 Drawing Figures METHOD OF FORMING WORKPIECES BY ABRADING BACKGROUND OF THE INVENTION This application relates to workpieces and a method of making same. The invention is particularly applicable to cutting tools and will be described with particular reference thereto. However, it will be appreciated that the invention has broader applications and may be used for other types of tools or the like.
Cutting tools commonly have a cylindrical mounting portion which is received in a chuck. A flat is provided on the cylindrical mounting portion. A set screw threaded on the chuck is adapted to bear against the flat for holding the cylindrical mounting portion against rotation relative to the chuck.
Tools of the type described are commonly formed by machining a piece of tool steel to the rough shape desired. The flat is also machined into the cylindrical mounting portion. The tool is then hardened. After hardening, at least the cylindrical mounting portion must be ground to a precise diameter so that it will closely fit within a chuck. In previous arrangements, the cylindrical mounting portion was rough ground oversize by centerless grinding. The flat in the cylindrical mounting portion presentsa peripheral discontinuity in the cylindrical'rnounting portion. During centerless grinding, this peripheral discontinuity causes uneven pressure against the peripheral surface of the cylindrical mounting portion. For example, when the flat is in the area of the work rest blade on the centerless grinder, the pressure against the cylindrical mounting portion on opposite sides of the flat is greater than when the flat 'is away from the work rest blade. Likewise, when the flat is against the grinding wheel the pressure between the grinding wheel and the surfaces of the cylindrical mounting portions on opposite sides of the flat is greater. This makes it extremely difficult, if not impossible. to obtain precise diameters by centerless grinding. There is changing pressure on the workpiece as it rotates past the backup wheel, the grinding and the work rest blade. This successive variation in pressure on the workpiece causes certain areas to be ground away more rapidly than others so that the cylindrical portion would take on somewhat of an oval shape. The peripheral discontinuity also causes the grinding wheel to wear unevenly and it must be dressed frequently.
In previous arrangements, thecylindrical mounting portion of the tool was rough ground oversize by centerless grinding because this is the most economical and rapid way of grinding a cylindrical workpiece to a rough diameter. The too] then had to be mounted in a cylindrical grinder between centers for finish grinding the cylindrical mounting portion to a predetermined finish diameter.
SUMMARY around the entire peripheral surface of the cylindrical mounting portion. Therefore, there is no variation in pressure as the workpiece rotates between the backup wheel, grinding wheel and work rest blade. Grinding action occurs on substantially true cylindrical surfaces so that accuracy is highly improved.
It is a principal object of the present invention to provide an improved method for finish grinding a metal workpiece.
It is also an object of the present invention to provide an improved method for finish grinding a cylindrical mounting portion of a tool.
It is an additional object of the present invention to provide an improved tool having an improved cylindrical mounting portion thereon.
It is a further object of the present invention to provide a method of manufacturing a tool which is less expensive than existing procedures.
It is another object of the present invention to provide an improved method of grinding a cylindrical mounting portion of a workpiece to a predetermined diameter within very close tolerances.
BRIEF DESCRIPTION OF THE DRAWING The invention may take form in certain parts and arrangements of parts, a preferred embodiment of which will be described in detailin this specification and illustrated in the accompanying drawing which forms a part hereof.
FIG. 1 is an elevational view showing a prior art type of tool;
FIG. 2 is a plan view looking generally in the direction of arrows 2-2 of FIG. 1;
FIG. 3 is an elevational view of an improved tool constructed in accordance with the present invention;
FIG. 4 is a view similar to FIG. 3 and showing the tool after a further step in the manufacturing procedure;
FIG. 5 is a plan view looking generally in the direction of arrows 5-5 of FIG. 4;
FIG. 6 is a side elevational view showing the improved too] of the present invention mounted in a centerless grinder; and
FIG. 7 is a plan view looking generally in the direction of arrows 7-7 of FIG. 6.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, wherein the showings are for purposes of illustrating a preferred embodiment of the invention only and not for purposes of limiting same, FIG. 1 shows a prior art type of cutting tool A. Tool A is formed from tool steel and includes a cylindrical mounting portion 12. Cylindrical mounting portion 12 terminates at spaced-apart opposite end portions 14 and 16. Cutting edges for a drill, end mill or the like are adapted to be formed on opposite end portions 18 and 20 of tool A.
A fiat surface 22 is formed into cylindrical mounting portion 12. Flat surface 22 has opposite arcuate sides 26 and 28. Sloping shoulders 32 and 34 slope from sides 26 and 28 down to flat surface 22. Flat surface 22 lies in a plane extending parallel to'the longitudinal axis of cylindrical mounting portion 12. Flat surface 22 is formed into cylindrical portion 12 so that it terminates short of the longitudinal axis of tool 12. Therefore, spaced-apart opposite edges 36 and 38 of flat surface 22 extend over an arc of around l50 on the outer pe- 3 ripheral surface of cylindrical mounting portion 12. it will be recognized that this are is immaterial and flat surface 22 may be formed to any desirable depth into cylindrical mounting portion 12 as long as sufficient material remains to insure strength and rigidity.
With a prior art tool machined to the shape described, the tool is then hardened. After hardening, it is necessary to grind cylindrical mounting portion 12 to a desirable predetermined cylindrical diameter so that it will closely fit within a mounting chuck. The most efficient and least expensive manner of grinding cylindrical mounting portions to a precise diameter is by centerless grinding. When tool A is positioned in a centerless grinder, flat surface 22 presents a peripheral discontinuity on outer cylindrical surface 12. In any given position of tool A in the centerless grinder, the peripheral discontinuity caused by flat surface 22 causes different pressures to be brought against different outer peripheral surfaces of cylindrical mounting portion 12. For example, as cylindrical mounting portion 12 is rotating past grinding wheel with flat surface 22 facing the grinding wheel, only those cylindrical portions between edges 14 and 26, and 16 and 28, are bearing against the grinding wheel. However, the backup wheel is bearing across the entire outer periphery of cylindrical mounting portion 12 between edges 14 and 16 op posite flat surface 22. This causes a greater pressure to be exerted on the peripheral surface portions between edges 14 and 26, and 16 and 28. When flat surface 22 is rotating past the backup wheel, the pressure .of the backup wheel is greater on those peripheral surfaces extending between edges 14 and 26, and 16 and 28. However, the pressure of the grinding wheel is uniform across the entire peripheral surface of cylindrical.
mounting portion 12 between edges 14 and 16 opposite flat surface 22. Therefore, the grinding action which takes place on the peripheral surface portion opposite to flat surface 22 has a lower per unit pressure thanthat exerted against the peripheral surface when flat surface 22 is passing the grinding wheel. This difference in pressure on the peripheral surfaces of cylindrical mounting portion 12 makes it extremely difficult, if not .impossible, to hold a desired cylindrical diameter within'close tolerances by centerless grinding. Therefore, it is necessary to only rough centerless grind to oversize diameter and to then mount the tool in a cylindrical grinder between centers for accurately grinding cylindrical mounting portion 12 to a cylindrical diameter within close tolerances.
In accordance with the present invention, a cutting tool B is machined from tool steel to the rough shape shown in FIG. 3. Tool B has a cylindrical mounting portion C which actually comprises two spaced-apart cylindrical mounting portions 40 and 42. Cylindrical mounting portion C has longitudinally-spaced- apartopposite edges 44 and 46. Opposite end portions 48 and 50 on tool B are adapted to be formed into cutting edges or the like. A cylindrical peripheral recess D is machined into cylindrical mounting portion C. Peripheral recess D is preferably centrally located between opposite ends 44 and 46 of cylindrical mounting portion C. Peripheral recess'D has spaced-apart opposite edges 52 and 54 which also respectively define opposite edges for cylindrical mounting portions 40 and 42. Peripheral recess portion D has a diameter only slightly less than the outer diameter of cylindrical mounting portion C so that cylindrical mounting portion C retains its strength while providing peripheral recess D with a peripheral surface which is below the outer peripheral surface of cylindrical mounting portion C.
It will be recognized that opposite portions 48 and 50 of tool B define cutting body portions which have a diameter substantially less than the diameter of cylindrical mounting portion C. Cutting edges generally indicated at 70 and 72 may be formed on cutting body portions 48 and 50. Cutting edges for an end mill are shown. However, it will be recognized that many different types of cutting edges or tool edges may be formed on opposite body portions 48 and 50. In the arrangement described, flat surface 60 lies in a plane extending parallel to the longitudinal axis of tool B. Flat surface 60 is also machined into peripheral recess portion D so that its opposite edges 74 and 76' extend over an arc of around l50 on the outer periphery of peripheral recess D. It will be recognized that flat surface 60 may be machined into peripheral recess D to extend over any desirable arc. It is simply necessary that flat surface 60 be sufiiciently wide so that a set screw will have adequate bearing thereagainst to firmly hold cylindrical mounting portion C within a chuck.
Instead of forming a cutting tool having two opposite bodies 48 and 50, it will be recognized that body 50 may be omitted so that cylindrical mounting portion C would terminate at end 46. Cylindrical mounting por tion C would then simply extend between opposite ends 44 and 46, and have one body 48 extending therefrom. End 46 would then simply be flat. A tool having working ends at both of the opposite ends thereof is described merely for simplicity of description. However, it will be appreciated that the invention also covers cutting tools and formation thereof when only one working end is provided. 4
Subsequent to machining of the tool as described, the tool is hardened. Subsequent to hardening, it is necessary to finish grind cylindrical portion C to a predetermined diameter within very precise tolerances. With peripheral recess portion D, cylindrical mounting portion C includes two spaced-apart substantially perfectly cylindrical surfaces 40 and 42. Peripheral recess D provides a discontinuity around the entire peripheral surface of cylindrical mounting portion C. Therefore,
there is no re-occurring discontinuity as described with respect to the prior art tool. Uneveness of pressure during centerless grinding does not exist because grinding takes place on two perfectly cylindrical surfaces having no short discontinuity therein.
Tool B may then be positioned in a plunge-type centerless grinder including a rotatable cylindrical grinding wheel E and a rotatable cylindrical backup wheel F. A work rest blade G positioned between grinding wheel E and backup wheel F below the axes of rotation thereof provides an upwardly facing surface 80 on which tool B rests. Backup wheel F forces tool B substantially constant. This makes it possible to centerless grind cylindrical portions 40 and 42 to a very precise diameter within very close tolerances bycenterless grinding. In the arrangement shown, grinding wheel E and backup wheel F have a width to extend completely across cylindrical mounting portion C between opposite ends 44 and 46 thereof.
It will be recognized that tool B may also be mounted in a different type of centerless grinder for finish grinding of body portions 48 and 50 for finishing of the cutting tool edges. The plunge-type of centerless grinder for finish grinding cylindrical portion C has been generally shown because it is what forms the basis of the present invention. In the preferred arrangement, cylindrical mounting portion C is finish ground to a finish diameter between 8 and 14 thousandths greater than the diameter of peripheral recess D. Furthermore, it has been found that it is possible to finish cylindrical mounting portion C by centerless grinding to a diameter which does not deviate from that of a perfect cylinder by more than 0.0005 inch.
lt is possible to achieve roundness tolerances within 0.0001 inch if so desired. The grinding action on cylindrical mounting portion C is broken up by providing peripheral recess D so that the grindability ratio goes up. More workpieces can be finish ground per dressing of the grinding wheel. It is also possible to use harder grinding wheels so that life of thegrinding wheel is increased. A higher productivity is achieved with the present invention because down-time hours of the grinder will be greatly decreased.
Although the invention has been shown and described with reference to a preferred embodiment, it will be recognized that equivalent alterations and modifications will occur to others skilled in the art upon the reading and understanding of this specification. The present invention includes all such equivalent alterations and modifications and is limited only by the scope of the claims.
Having thus described my invention, I claim:
1. A method of finishing a metal workpiece having a longitudinal axis and a cylindrical mounting portion comprising the steps of; forming a peripheral recess in said cylindrical mounting portion to provide a cylindrical recess portion having spaced-apart shoulders and a diameter less than said cylindrical mounting portion, forming a flat surface in said recess portion lying in a plane parallel to said longitudinal axis, hardening said workpiece, and finishing said cylindrical mounting portion to a predetermined diameter by centerless grinding.
2. The method of claim 1 wherein said cylindrical mounting portion has opposite ends and said step of machining said recess is carried out by machining said recess at a location substantially centrally between said opposite end portions.
3. The method of claim 2 wherein said recess has spaced-apart shoulders and said step of forming said flat surface is carried out forming said flat surface at a location substantially centrally between said shoulders to a width less than the distance between said shoulders.
4. The method of claim 1 wherein said workpiece comprises a tool having a cutting body portion integral with said mounting portion, and further including the step of forming said cutting body portion to a diameter less than the diameter of said mounting portion and forming cutting edges on said body portion prior to said step of hardening said workpiece.
5. The method of claim 1 wherein said step of finishing said cylindrical mounting portion is carried out by centerless grinding of said mounting portion to a finished diameter between 8 and I4 thousandths greater than the diameter of said cylindrical recess portion.
6. The method of claim 1 wherein said step of finishing said'cylindrical mounting portion is carried out by centerless grinding of said cylindrical portion to a diameter which does not deviate from that of a perfect cylinder by more than 0.0005 inch.
Claims (6)
1. A method of finishing a metal workpiece having a longitudinal axis and a cylindrical mounting portion comprising the steps of; forming a peripheral recess in said cylindrical mounting portion to provide a cylindrical recess portion having spaced-apart shoulders and a diameter less than said cylindrical mounting portion, forming a flat surface in said recess portion lying in a plane parallel to said longitudinal axis, hardening said workpiece, and finishing said cylindrical mounting portion to a predetermined diameter by centerless grinding.
2. The method of claim 1 wherein said cylindrical mounting portion has opposite ends and said step of machining said recess is carried out by machining said recess at a location substantially centrally between said opposite end portions.
3. The method of claim 2 wherein said recess has spaced-apart shoulders and said step of forming said flat surface is carried out forming said flat surface at a location substantially centrally between said shoulders to a width less than the distance between said shoulders.
4. The method of claim 1 wherein said workpiece comprises a tool having a cutting body portion integral with said mounting portion, and further including the step of forming said cutting body portion to a diameter less than the diameter of said mounting portion and forming cutting edges on said body portion prior to said step of hardening said workpiece.
5. The method of claim 1 wherein said step of finishing said cylindrical mounting portion is carried out by centerless grinding of said mounting portion to a finished diameter between 8 and 14 thousandths greater than the diameter of said cylindrical recess portion.
6. The method of claim 1 wherein said step of finishing said cylindrical mounting portion is carried out by centerless grinding of said cylindrical portion to a diameter which does not deviate from that of a perfect cylinder by more than 0.0005 inch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00298940A US3811234A (en) | 1972-10-19 | 1972-10-19 | Method of forming workpieces by abrading |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00298940A US3811234A (en) | 1972-10-19 | 1972-10-19 | Method of forming workpieces by abrading |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3811234A true US3811234A (en) | 1974-05-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00298940A Expired - Lifetime US3811234A (en) | 1972-10-19 | 1972-10-19 | Method of forming workpieces by abrading |
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| Country | Link |
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| US (1) | US3811234A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160176005A1 (en) * | 2013-08-29 | 2016-06-23 | Jun Hirade | Shaft member for fluid dynamic bearing device and manufacturing method for shaft member |
| US20180369983A1 (en) * | 2016-03-15 | 2018-12-27 | Erwin Junker Maschinenfabrik Gmbh | Method for the complete grinding of workpieces in the form of shafts having cylindrical and profiled sections |
| CN111673403A (en) * | 2020-05-29 | 2020-09-18 | 贵州泰和超硬工具股份有限公司 | Hard alloy twist drill rod grinding process |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2718689A (en) * | 1950-09-28 | 1955-09-27 | Roger S Mason | Routing |
| US3298140A (en) * | 1964-05-20 | 1967-01-17 | Joslyn Mfg & Supply Co | Tool fixture |
| US3626644A (en) * | 1969-07-17 | 1971-12-14 | John A Cupler | Method of making solid diamond drills |
| US3732648A (en) * | 1971-12-20 | 1973-05-15 | Sundstrand Engelberg | Regulating wheel |
-
1972
- 1972-10-19 US US00298940A patent/US3811234A/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2718689A (en) * | 1950-09-28 | 1955-09-27 | Roger S Mason | Routing |
| US3298140A (en) * | 1964-05-20 | 1967-01-17 | Joslyn Mfg & Supply Co | Tool fixture |
| US3626644A (en) * | 1969-07-17 | 1971-12-14 | John A Cupler | Method of making solid diamond drills |
| US3732648A (en) * | 1971-12-20 | 1973-05-15 | Sundstrand Engelberg | Regulating wheel |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160176005A1 (en) * | 2013-08-29 | 2016-06-23 | Jun Hirade | Shaft member for fluid dynamic bearing device and manufacturing method for shaft member |
| US9931725B2 (en) * | 2013-08-29 | 2018-04-03 | Ntn Corporation | Shaft member for fluid dynamic bearing device and manufacturing method for shaft member |
| US20180369983A1 (en) * | 2016-03-15 | 2018-12-27 | Erwin Junker Maschinenfabrik Gmbh | Method for the complete grinding of workpieces in the form of shafts having cylindrical and profiled sections |
| US10576602B2 (en) * | 2016-03-15 | 2020-03-03 | Erwin Junker Maschinenfabrik Gmbh | Method for the complete grinding of workpieces in the form of shafts having cylindrical and profiled sections |
| CN111673403A (en) * | 2020-05-29 | 2020-09-18 | 贵州泰和超硬工具股份有限公司 | Hard alloy twist drill rod grinding process |
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