US2567299A - Toolholding spindle for die-lapping machines - Google Patents
Toolholding spindle for die-lapping machines Download PDFInfo
- Publication number
- US2567299A US2567299A US37285A US3728548A US2567299A US 2567299 A US2567299 A US 2567299A US 37285 A US37285 A US 37285A US 3728548 A US3728548 A US 3728548A US 2567299 A US2567299 A US 2567299A
- Authority
- US
- United States
- Prior art keywords
- tool
- spindle
- lapping
- rings
- die
- 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.)
- Expired - Lifetime
Links
- 210000004907 gland Anatomy 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 101000713585 Homo sapiens Tubulin beta-4A chain Proteins 0.000 description 1
- 102100036788 Tubulin beta-4A chain Human genes 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
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
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/36—Single-purpose machines or devices
- B24B5/48—Single-purpose machines or devices for grinding walls of very fine holes, e.g. in drawing-dies
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T279/00—Chucks or sockets
- Y10T279/17—Socket type
- Y10T279/17957—Friction grip
Definitions
- Ihis invention relates to .asihollo'w sspindleyf or holding a rotary tool and, in particular, to a spindle for a die-lapping machine and improved means for yieldably mounting the -tool therein.
- Gang .lapping machines such as are usedior opening wire-drawing dies, have a plurality of tool-holding spindles mounted in. a head which is movable vertically toward. and from a worksupporting table .therebelow.
- a lapping tool is inserted in .each spindlev and extendsv therethrough so its point .will en age. a blank-omthe table. If the. tools are fixed in the spindles, they are caused to engage the blanks under such pressure that the flapping is inaccurate and the life of the tools is short.
- These rings apply a limited positive thrust to the tools as thevertically movable head descends to bring the tool points into engagement with the work, but yield under a predetermined back pressure, thereby preventing excessive pressure of the tool on the work.
- the rings also transmit driving torque by friction from the spindle to the tool without slippage.
- Figure 1 is a partial vertical section through a spindle for holding and driving a lapping tool, having the invention incorporated therein;
- Figure 2 is a similar view of a portion of the spindle showing a further novel feature of the invention.
- vertically spaced plates I0 and II constitute the crosshead of a lapping machine and may be secured together by spacer bolts in the manner shown in Patent No. 2,366,062.
- the crosshead is mounted, as shown therein, for vertical reciprocation toward and of spindles, each la p n w one suc p ndl !5 1s Sho n h r in- Thespindle lapping machines of the t'ypeherein contemplated a u u l y provided .with a mu tiplic ty ada t d to receive the shank of For'the sake of simplicity, only tubular, having a bore therethrough.
- inef .21 is jdispgse l w t e ea n It and a cover above e b ar n l .beari ss 5 nd H a e mainta ed n perly
- the inner aces f he spacedrelation by a spacer-sleeve 2 3 f tting snug ly on the spindle l5.
- a driving 'pul'ley"24"' is mounted on the sleeve and is secured to the spindle by a set screw, extending radially thereof and through a hole in the sleeve.
- Circumferential recesses or grooves 25 are formed in the bore through the spindle l5 adjacent the ends thereof and rings or washers 2B of rubber or like material are seated therein.
- a lapping tool 2'! is inserted through the bore in the spindle and is'frictionally engaged by the inner edges of the rings 26.
- the tool shank has ample clearance for free movement in the bore through the spindle.
- the normal inside diameter of the rings 26, however, is slightly less than the diameter of the tool shank, thereby effecting a snug fit of the rings on the shank.
- the point of the tool 21 is adapted to engage the blank [4 intermittently as the crosshead is reciprocated at a frequency of several hundred vibrations per minute.
- the rings 26 transmit limited axial force to the tool, causing it to exert a certain pressure on the blank.
- the rings 26 flex because of the yielding character of the material of which they are composed, permitting limited axial movement of the tool in the spindle bore and preventing further substantial increase in the pressure.
- the overall stroke or throw of the crosshead is only a small fraction of an inch and the yielding of the rings 26 is sufiicient with such a limited movement to relieve excess tool pressure which would otherwise result therefrom.
- the rings restore the tool to normal position.
- Figure 2 shows a further improvement in the spindle for mounting and driving the lapping tool.
- the ends of the spindle are counterbored and tapped to accommodate bushings or glands 28. These glands serve to hold the rings 26 in the grooves 25. They also serve to compress the rings slightly when desired to cause radial contraction thereof for adjusting their frictional grip on the tool shank. This makes it possible to compensate for such slight wear of the inside periphery of the rings as may result from long continued use thereof.
- the invention provides a tool-holding spindle for lapping machines having several advantages over machines known previously.
- the principal advantage is that a limited positive downward force is exerted on the lapping tool through the yielding rings as the crosshead descends. rings cushions the engagement of the tool with the blank and prevents excessive pressure from being'applied to the tool.
- the frictional grip exerted on the tool shank by the yielding rings is ample to transmit the relatively low torque necessary from the driving spindle to the tool.
- the tool may be easily removed from the spindle, however, when desired, for the purpose of grinding, and as readily replaced.
- a spindle journaled for rotation and mounted for reciprocation toward and from a die-blank holder, said spindle having an axial bore therein, a lapping tool having a shank smaller than said bore inserted into the later, a pair of washers of rubber-like materialfixed in said bore at points spaced therealong, the inner edge of each Washer fitting snugly around said shank and being adapted to flex under thrust applied to the tool as a result of engagement with a die blank on the holder, thereby permitting limited axial movement of the tool in said bore while constantly tending to restore it to normal position and thus cushioning repeated engagements of the tool with the blank.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Description
Sept. 11, 1951 PASTELL 2,567,299
TOOL-HOLDING SPINDLE FOR DIE-LAPPING MACHINES Filed July 6, 1948 [Wei afar: DEWEY P475 TELL,
Patented Sept. 11, 1951 um rso emu-r oFFicE q ,rootuotmre Q 7 MA NES DeweyPastelL'Winthrop Harbonlll. v Application July 6, 1948', Serial No. 37,285.. V l t V 1 Claim,
. :L Ihis invention relates to .asihollo'w sspindleyf or holding a rotary tool and, in particular, to a spindle for a die-lapping machine and improved means for yieldably mounting the -tool therein.
Gang .lapping machines, such as are usedior opening wire-drawing dies, have a plurality of tool-holding spindles mounted in. a head which is movable vertically toward. and from a worksupporting table .therebelow. A lapping tool is inserted in .each spindlev and extendsv therethrough so its point .will en age. a blank-omthe table. If the. tools are fixed in the spindles, they are caused to engage the blanks under such pressure that the flapping is inaccurate and the life of the tools is short. These results are .,e,voided by permitting the tools to float in the spindles, as disclosed in Sengenberger Patent No. 2 $66,062, but a longer time is required to complete the lapping operation.
I have invented novel means for mounting the shank of a lapping tool in a driving spindle whereby the feed of the tool toward the work is positive yet cushioned so that the lapping progresses rapidly and is done accurately, but the tools/have a long useful life. In a preferred embodiment, I provide a driving spindle with yielding collars or rings of rubber or the like seated therein and spaced therealong, adapted to embrace the tool shank snugly with a frictional fit. These rings apply a limited positive thrust to the tools as thevertically movable head descends to bring the tool points into engagement with the work, but yield under a predetermined back pressure, thereby preventing excessive pressure of the tool on the work. The rings also transmit driving torque by friction from the spindle to the tool without slippage.
A complete understanding of the invention may be obtained from the following detailed description which refers to the accompanying drawings illustrating the preferred embodiment. In the drawings,
Figure 1 is a partial vertical section through a spindle for holding and driving a lapping tool, having the invention incorporated therein; and
Figure 2 is a similar view of a portion of the spindle showing a further novel feature of the invention.
Referring in detail to the drawings and for the present to Figure 1, vertically spaced plates I0 and II constitute the crosshead of a lapping machine and may be secured together by spacer bolts in the manner shown in Patent No. 2,366,062. The crosshead is mounted, as shown therein, for vertical reciprocation toward and of spindles, each la p n w one suc p ndl !5 1s Sho n h r in- Thespindle lapping machines of the t'ypeherein contemplated a u u l y provided .with a mu tiplic ty ada t d to receive the shank of For'the sake of simplicity, only tubular, having a bore therethrough. lt is journaled in anti-friction bearings I6 and I1 seat d in s a e holes in the pl te wa d I and secured therein by retainers l6. Eelt rin'gs -:!.9a .0ve and below the retainers is are held in P ey meta e s 0- A sea in v. inef .21 is jdispgse l w t e ea n It and a cover above e b ar n l .beari ss 5 nd H a e mainta ed n perly The inner aces f he spacedrelation by a spacer-sleeve 2 3 f tting snug ly on the spindle l5. A driving 'pul'ley"24"'is mounted on the sleeve and is secured to the spindle by a set screw, extending radially thereof and through a hole in the sleeve.
Circumferential recesses or grooves 25 are formed in the bore through the spindle l5 adjacent the ends thereof and rings or washers 2B of rubber or like material are seated therein. A lapping tool 2'! is inserted through the bore in the spindle and is'frictionally engaged by the inner edges of the rings 26. The tool shank has ample clearance for free movement in the bore through the spindle. The normal inside diameter of the rings 26, however, is slightly less than the diameter of the tool shank, thereby effecting a snug fit of the rings on the shank.
The point of the tool 21 is adapted to engage the blank [4 intermittently as the crosshead is reciprocated at a frequency of several hundred vibrations per minute. As the cross-head descends, bringing the tool point into engagement with the work, the rings 26 transmit limited axial force to the tool, causing it to exert a certain pressure on the blank. As soon as the back pressure equals this amount, the rings 26 flex because of the yielding character of the material of which they are composed, permitting limited axial movement of the tool in the spindle bore and preventing further substantial increase in the pressure. As stated in the patent aforementioned, the overall stroke or throw of the crosshead is only a small fraction of an inch and the yielding of the rings 26 is sufiicient with such a limited movement to relieve excess tool pressure which would otherwise result therefrom. As the cross-head ascends, the rings, of course, restore the tool to normal position.
Figure 2 shows a further improvement in the spindle for mounting and driving the lapping tool. In this form of the invention, the ends of the spindle are counterbored and tapped to accommodate bushings or glands 28. These glands serve to hold the rings 26 in the grooves 25. They also serve to compress the rings slightly when desired to cause radial contraction thereof for adjusting their frictional grip on the tool shank. This makes it possible to compensate for such slight wear of the inside periphery of the rings as may result from long continued use thereof.
It will be evident from the foregoing that the invention provides a tool-holding spindle for lapping machines having several advantages over machines known previously. The principal advantage, of course, is that a limited positive downward force is exerted on the lapping tool through the yielding rings as the crosshead descends. rings cushions the engagement of the tool with the blank and prevents excessive pressure from being'applied to the tool. As a result, the lapping is rapidly and accurately done and the tool is preserved in effective condition throughout a long, useful life. The frictional grip exerted on the tool shank by the yielding rings is ample to transmit the relatively low torque necessary from the driving spindle to the tool. The tool may be easily removed from the spindle, however, when desired, for the purpose of grinding, and as readily replaced.
Although I have illustrated and described but a preferred embodiment of my invention, it will be recognized that changes in the details and arrangement thereof may be made without departing from the spirit of the invention or the scope of the appended claim.
In a die-lapping machine, a spindle journaled for rotation and mounted for reciprocation toward and from a die-blank holder, said spindle having an axial bore therein, a lapping tool having a shank smaller than said bore inserted into the later, a pair of washers of rubber-like materialfixed in said bore at points spaced therealong, the inner edge of each Washer fitting snugly around said shank and being adapted to flex under thrust applied to the tool as a result of engagement with a die blank on the holder, thereby permitting limited axial movement of the tool in said bore while constantly tending to restore it to normal position and thus cushioning repeated engagements of the tool with the blank.
At the same time the yielding of the DEWEY PASTELL.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 469,052 Wood Feb. 16, 1892 812,549 Cotton et al Feb. 13, 1906 1,800,254 Holmes Apr. 14, 1931 2,285,956 Weber June 9, 1942 2,366,062 Sengenberger Dec. 26, 1944 2,417,249 Griswold Mar. 11, 1947 2,426,200 Green Aug. 26, 1947 FOREIGN PATENTS Number Country Date 109,231 Great Britain of 1917
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US37285A US2567299A (en) | 1948-07-06 | 1948-07-06 | Toolholding spindle for die-lapping machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US37285A US2567299A (en) | 1948-07-06 | 1948-07-06 | Toolholding spindle for die-lapping machines |
Publications (1)
Publication Number | Publication Date |
---|---|
US2567299A true US2567299A (en) | 1951-09-11 |
Family
ID=21893509
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US37285A Expired - Lifetime US2567299A (en) | 1948-07-06 | 1948-07-06 | Toolholding spindle for die-lapping machines |
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US (1) | US2567299A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7568417B1 (en) * | 2008-06-23 | 2009-08-04 | Lee Richard J | Device and method for pulling bullets from cartridges |
US20120057946A1 (en) * | 2010-09-08 | 2012-03-08 | Daishowa Seiki Kabushiki Kaisha d/b/a BIG DAISHOWA SEIKI CO LTD | Holding apparatus for cutting tool |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US469052A (en) * | 1892-02-16 | Device for grinding and polishing glassware | ||
US812549A (en) * | 1904-09-21 | 1906-02-13 | William E Cotton | Extension gas-chandelier. |
GB109231A (en) * | 1917-05-10 | 1917-09-06 | William Connolly | Improved Flexible Chuck. |
US1800254A (en) * | 1926-12-18 | 1931-04-14 | Frank J Holmes | Handle and the like |
US2285956A (en) * | 1940-05-18 | 1942-06-09 | Jas H Matthews & Company | Resilient mounting for stamps in stamp holders |
US2366062A (en) * | 1943-09-21 | 1944-12-26 | American Steel & Wire Co | Machine for opening or lapping wire drawing dies and the like |
US2417249A (en) * | 1944-06-27 | 1947-03-11 | Kaiser Fleetwings Inc | Constant volume connection for fluid conduits |
US2426200A (en) * | 1941-10-09 | 1947-08-26 | Green Mfg Co Inc | Feeding device |
-
1948
- 1948-07-06 US US37285A patent/US2567299A/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US469052A (en) * | 1892-02-16 | Device for grinding and polishing glassware | ||
US812549A (en) * | 1904-09-21 | 1906-02-13 | William E Cotton | Extension gas-chandelier. |
GB109231A (en) * | 1917-05-10 | 1917-09-06 | William Connolly | Improved Flexible Chuck. |
US1800254A (en) * | 1926-12-18 | 1931-04-14 | Frank J Holmes | Handle and the like |
US2285956A (en) * | 1940-05-18 | 1942-06-09 | Jas H Matthews & Company | Resilient mounting for stamps in stamp holders |
US2426200A (en) * | 1941-10-09 | 1947-08-26 | Green Mfg Co Inc | Feeding device |
US2366062A (en) * | 1943-09-21 | 1944-12-26 | American Steel & Wire Co | Machine for opening or lapping wire drawing dies and the like |
US2417249A (en) * | 1944-06-27 | 1947-03-11 | Kaiser Fleetwings Inc | Constant volume connection for fluid conduits |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7568417B1 (en) * | 2008-06-23 | 2009-08-04 | Lee Richard J | Device and method for pulling bullets from cartridges |
US20120057946A1 (en) * | 2010-09-08 | 2012-03-08 | Daishowa Seiki Kabushiki Kaisha d/b/a BIG DAISHOWA SEIKI CO LTD | Holding apparatus for cutting tool |
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