US3304815A - Drill - Google Patents

Drill Download PDF

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Publication number
US3304815A
US3304815A US417538A US41753864A US3304815A US 3304815 A US3304815 A US 3304815A US 417538 A US417538 A US 417538A US 41753864 A US41753864 A US 41753864A US 3304815 A US3304815 A US 3304815A
Authority
US
United States
Prior art keywords
drill
flow
wall
tube
flushing medium
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
Application number
US417538A
Other languages
English (en)
Inventor
Faber Kurt Heinrich Albe Erich
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.)
Santrade Ltd
Original Assignee
Sandvik AB
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 Sandvik AB filed Critical Sandvik AB
Application granted granted Critical
Publication of US3304815A publication Critical patent/US3304815A/en
Assigned to SANTRADE LTD., A CORP. OF SWITZERLAND reassignment SANTRADE LTD., A CORP. OF SWITZERLAND ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SANDVIK AKTIEBOLAG, A CORP. OF SWEDEN
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/04—Drills for trepanning
    • B23B51/0486—Drills for trepanning with lubricating or cooling equipment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B51/00—Tools for drilling machines
    • B23B51/06—Drills with lubricating or cooling equipment
    • B23B51/063—Deep hole drills, e.g. ejector drills
    • 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
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/44—Cutting by use of rotating axially moving tool with means to apply transient, fluent medium to work or product
    • Y10T408/45—Cutting by use of rotating axially moving tool with means to apply transient, fluent medium to work or product including Tool with duct
    • Y10T408/455—Conducting channel extending to end of Tool

Definitions

  • the present invention relates to a drill having means for supplying a flushing medium to the front of the drill.
  • the purpose of such flushing medium is to cool and lubricate the drill and also to remove the cuttings.
  • the invention has been found especially useful in metal drills with a tubular drill stem, the chips formed during the drilling being removed through said stem.
  • the flushing medium has been supplied through openings or nozzles in the forward direction of the drill. Said medium has been returned by the contact with the bottom of the drill hole, the only force for bringing the medium rearwardly being the reaction force from the bottom of the hole when the forward flow reaches said bottom. This causes a pressure at the bottom of the hole and a tendency for leakage of flushing medium between the drill and the wall of the drill hole.
  • Another disadvantage is that the rearward flow often is too weak" to secure the desirable efiiciency in removing the cuttings, i.e. chips in the case of metal drills.
  • a purpose of the present invention is to provide a separate rearward action'on the return flow of the'fiushing medium thereby lessening the pressure of said medium at the front of the drill and also lessening the tendency of leakage. In thisway it becomes unnecessary to use special gaskets for preventing the leakage. Said separate rearward action also improves the removal of cuttings.
  • the separate rearward action according to the invention is obtained by diverting a part of the flow of flushing medium before it reaches the front of the drill and guiding'the diverted part rearwardly by means of nozzles or the like, thereby obtaining a rearward ejector effect.
  • the rest of the flow, which continues to the front of the drill, is, on its return, mixed with the said diverted part and flows rearwardly therewith, the momentum of the diverted flow being imparted to the mixture, so that the whole 'flowhas a homogenous rearward momentum.
  • the force for obtaining the rearward momentum is provided in this way by separate means it is obvious that the pressure of the flushing medium at the front of the drill may be smaller, thus diminishing the tendency for leakage.
  • the strength of the diverted flow of medium can be increased without increasing the said pressure at the front, thus providing the desired rearward force of the flow for obtaining sufficient removal of the cuttings.
  • the word forward relates to the axial penetration direction of the drill, the word rearward relating to the opposite direction.
  • FIG. 1 is partly a longitudinal section and partly an elevation of a tubular drill with a double wall according to the invention
  • FIG. 2 is a longitudinal section of a modification of the encircled part of the drill in FIG. 1,
  • FIG. 3 is a longitudinal section of another modification of the encircled part of the drill in FIG. 1,
  • FIG. 4 is a cross section on the line 44 in FIG. 1,
  • FIG. 5 is a fragmentary longitudinal section of another modification of the drill in FIG. 1,
  • FIG. 6 is partly a longitudinal section and elevation of a second embodiment of the drill
  • FIG. 7 is a cross section on the line 7-7 in FIG. 6,
  • FIG. 8 is a longitudinal section of a third embodiment of a drill according to the invention.
  • FIG. 9 is a side elevational view of the drill in FIG. 8,
  • FIG. 10 is an enlarged cross section on the line 1010 in FIG. 8,
  • FIG. 11 is a fragmentary longitudinal section of a modified detail of the drill in FIG. 1,
  • FIG. 12 is a fragmentary longitudinal section of another modification of the same detail that is shown in FIG. 11.
  • FIG. 1 a drill acting on a work piece 100.
  • the drill stem comprises a sleeve 10 and a tube 11, which at its fore end carries the drill bit 12 which advantageously may be of the type disclosed in my application Ser. No. 271,054, filed April 8, 1963, and now abandoned.
  • the front end of the drill bit has a number of cutting inserts 13.
  • the rear end of the inner tube 14 abuts tightly against the sleeve 10.
  • An annular outer sleeve 16 surrounding the sleeve 10 has a hole 17 for supplying flushing medium to the drill.
  • the outer sleeve 16 has at its inside an annular recess 18 which on both sides is surrounded by packings 19 and 20.
  • Thesleeve 10 has an opening 21 connecting the recess 18 with the rear part of the space 15. The described device permits rotation of the 'drill within the sleeve 16, at the same time as a flushing medium is continuously supplied through the hole 17 to the space 15 as indicated by' the arrow 28.
  • the fore part of the'inner tube 14 abuts against the flat portion of a ring 22 of relatively thin sheet material, said ring having a rearwardly inclined flange 22a extending rearwardly within the tube 14.
  • the foremost part of the Wall of the tube 14 has openings 23 separated by forwardly protruding portions 24 of the wall.
  • the portions 24 abut against the ring 22, the openings 23 forming slits along the ring.
  • the flushing medium is supplied at the rear end of the space 15 as indicated by the arrow 28.
  • the flow of medium When the flow of medium reaches the fore end of the space 15 it is divided into two branches as indicated by the arrow 29 having two branches 29a and 2912.
  • a part of the flow indicated by arrow branch 29a passes through the openings 23 and is deflected rearwardly by the flange 22a on the ring 22.
  • the rest of the flow indicated by arrow branch 2% flows through bores 26 and is directed by the flange 27 forwardly to the cutting inserts and cutting edges, as indicated by the arrows 30.
  • the flow along the arrows 30 returns rearwardly from the bottom of the drill hole inside the drill and joins the flow ejected rearwardly at the ring 22.
  • the flushing medium flows along the inside of the drill to a rear part of the drill where it is passed to the outside for instance through a sleeve device (not shown) similar to the medium supply structure 16-20. After separating the chips from the flushing medium, the medium can be recirculated through the drill.
  • the flushing medium serves for lubricating, cooling and chip removal.
  • a liquid is suitable, as for instance oil. It is also possible to use water containing an emulsion of some lubricant. If a liquid is used it is preferable that it fills the circulation system, the internal tube 14 thus being filled by the liquid.
  • a gas is suitable as flushing medium. When for instance drilling cast iron the flushing medium can be air carrying a mist of lubricant.
  • FIGS. 2, 3, l1 and 12 show various embodiments of the device for obtaining the rearward ejection effect, FIGS. 11 and 12 being variations of FIG. 3.
  • a rearward flange 31 integral with the drill bit 12a guides the medium flow as indicated by the arrows in the same way as the flange 22a of the ring 22 in FIG. 1.
  • the rearward flow is obtained by aid of one or more rearwardly inclined holes or slits 32 in the tube 140.
  • FIG. 11 which is a modification of FIG. 3 the internal tube corresponding to the tube 14 of FIG. 1 is divided into two parts marked 141 and 142.
  • the adjacent ends of the parts 141 and 142 are slightly conical along portions 143 and 144, between which there is an annular slit 145.
  • the outer conical portion 143 is closer to the axis as shown in the right hand part of the figure, forming contact points 146 between the portions 143 and 144.
  • FIG. 12 which is another variation of FIG. 3, shows the fore end of the internal tube, here marked 147, on a larger scale than in the previous figures.
  • a short tubular ring 143 which has the same diameter as :the tube 147.
  • the adjacent ends of the tube 147 and the ring 148 are chamfered and placed at a distance from each other to form a slit 149 which is inclined inwardly and rearwardly.
  • a sleeve 150 is mounted around them.
  • This sleeve 150 has its end edges 151 and 152 somewhat countersunk in shallow annular recesses around the tube 147 and the ring 148 to form an abutment determining the distance between the tube and the ring and the consequent width of the slit 4 149.
  • In the sleeve 150 there are holes 153 for the passage of flushing medium.
  • the sleeve is suitably brazed to the tube and the ring.
  • the inclination of the slit in relation to the drill axis should preferably be within the range -45 C. In order to avoid turbulence of the flow the inclination can advantageously be 8-15
  • the openings should be distributed as evenly as possible around the circumference of the tube in order to have a homogeneous and even flow.
  • FIG. 5 illustrates how the inner tube corresponding to the tube 14 of FIG. 1 is divided into two parts 14a and 1411, the adjacent ends being beveled and placed with a rearwardly and inwardly directed slit 533 between them.
  • the parts 14a and 14b can be joined by spot welding or brazing at spaced intervals around the periphery, leaving slits between the joined spots for the flow of flushing medium. Said flow is divided into two parts, one 34a passing from the slit 33 rearwardly into the tube, the other 34b continuing forwardly towards the fore part of the drill.
  • the device in FIG. 5 can be modified in the way shown in FIG. 12.
  • the drill in FIG. 1 has a thick outer tube 11 which is advantageous for obtaining the greatest possible moment inertia of the drill d m lle t possible stress in the 4 material.
  • the thin outer tube 40 is placed around the thick inner tube 41 with a narrow space 42 between the tubes. Flushing medium is supplied to the space 42 through the connection 43.
  • the connection 43 is firmly attached to the drill, which means that the drill does not rotate but the work-piece 101 rotates.
  • the outer tube 40 of FIG. 6 extends to the drill bit 52 and passes at its fore end a ring of radial holes 44 through the wall of the drill bit. These holes are connected to openings 45 through the fore end of the inner tube 41.
  • the openings 45 are separated by lugs 46 (FIG. 7) which are integral with the tube 41.
  • the lugs 46 abut against an annular ring 47 similar to the ring 22 of FIG. 1, having the internal edge rearwardly bent.
  • the ring 47 rests against the drill bit 52.
  • FIGS. 8-10 show a so-called gun drill comprising a tubular part and a drill bit 61.
  • the tubular part has a cross section which is partly inwardly deflected to a V-shaped groove 62.
  • the drill bit has a corresponding groove.
  • the chips are removed along the groove 62.
  • a lug shaped portion 63 is cut out in the wall of the tube and bent inwardly, thereby forming an opening 64 facing rearwardly.
  • Flushing medium is supplied in the direction indicated by the arrow 65 and the flow is divided at the opening 64 into a rearwardly directed flow 65a through the wall of the V-shaped recess and a forwardly directed flow 6517, which passes through a bore in the drill bit 61 to the cutting edges.
  • the ejector effect of the flow along the arrow 65a as well as the flow returning from the cutting edges carry the chips.
  • the invention is illustrated in connection with a metal drill which represents an important field of use for the invention, but it can also be employed in connection with other kinds of drills as for instance tubular rock and earth drills.
  • a drill for chip cutting piece comprising a tubular shaft having an inner and an outer wall with a space therebetween, cutting edges on the front end of said shaft, at least one of said cutting edges extending laterally beyond the outer surface of said tubular shaft, means for delivering flushing medium to said space, a first aperture having its outlet at the outer surface of said outer wall rearwardly of said cutting edges for delivering a forwardly directed first flow of flushing medium from said space to said cutting edges, a passageway permitting return flow of flushing medium from said cutting edges to the cavity within said inner wall and a second aperture having its outlet at the inner surface of said inner wall for delivering a second flow in the form of a rearwardly directed jet of flushing medium from said space int-o said cavity.
  • the second aperture comprising a number of openings spaced around the periphery of the inner wall.
  • Drill according to claim 3 in which the second aperture consists of a number of openings surrounding the inner cavity of the drill shaft.
  • the second aperture substantially has the shape of an annular slit around the periphery of the inner wall, said slit being subdivided and forming a number of arcuate slits.
  • the first aperture has the shape of a number of openings around the periphery of the outer wall of the drill shaft, a flange surrounding said openings for deflecting the flow forwardly on the outside of the drill.
  • a third aperture is arranged in the inner wall to the rear of the second aperture for obtaining a third, rearwardly directed flow cooperating with and increasing the rearward jet effect of the second flow.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Drilling Tools (AREA)
  • Earth Drilling (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
US417538A 1963-12-14 1964-12-11 Drill Expired - Lifetime US3304815A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1394063 1963-12-14

Publications (1)

Publication Number Publication Date
US3304815A true US3304815A (en) 1967-02-21

Family

ID=20298272

Family Applications (1)

Application Number Title Priority Date Filing Date
US417538A Expired - Lifetime US3304815A (en) 1963-12-14 1964-12-11 Drill

Country Status (11)

Country Link
US (1) US3304815A (xx)
AT (1) AT254655B (xx)
BE (1) BE656908A (xx)
BR (1) BR6464000D0 (xx)
CH (1) CH446012A (xx)
DE (1) DE1477730B2 (xx)
DK (1) DK105902C (xx)
FI (1) FI41791B (xx)
FR (1) FR1416995A (xx)
GB (1) GB1084269A (xx)
NL (1) NL6413738A (xx)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3511120A (en) * 1965-12-29 1970-05-12 Bbc Brown Boveri & Cie Gun drill
US4230429A (en) * 1977-07-06 1980-10-28 Komet Stahlhalter- Und Werkzeugfabrik Robert Breuning Gmbh Boring tool for making borings in solid metal material of workpieces
US4395169A (en) * 1979-07-04 1983-07-26 Mitsubishi Kinzoku Kabushiki Kaisha Drill bit
US4628584A (en) * 1985-01-28 1986-12-16 The Dow Chemical Company Method of removing fibers protruding into bores
US4966503A (en) * 1989-05-30 1990-10-30 The Boeing Company Drill bit for drilling a hole in layered material of different hardness
US5092716A (en) * 1989-11-25 1992-03-03 Omi Kogyo Co., Ltd. Drill and method for using the same
EP1525937A2 (en) * 2003-10-23 2005-04-27 Ishihara Kikai Kogyo Co. Ltd. Non-core type bit, non-core drill apparatus, and method of supplying cooling water thereto
EP2006043A1 (en) * 2006-04-07 2008-12-24 UNITAC, Incorporated Deep hole drilling machine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2724266C2 (de) * 1977-05-28 1982-02-18 Karl 3350 Kreiensen Burgsmüller Tiefbohrwerkzeug
DE3203134C2 (de) * 1982-01-30 1984-01-05 Tbt Tiefbohrtechnik Gmbh Und Co Kg, 7433 Dettingen Tiefbohrwerkzeug
EP0097879B1 (de) * 1982-06-29 1990-10-17 Gelsen, Karl-Heinz Bohrgerät
SE457696B (sv) * 1987-05-21 1989-01-23 Sandvik Ab Borr foer paketborrning

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1281420A (en) * 1917-10-06 1918-10-15 Joseph Snively Reid Boring apparatus.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1281420A (en) * 1917-10-06 1918-10-15 Joseph Snively Reid Boring apparatus.

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3511120A (en) * 1965-12-29 1970-05-12 Bbc Brown Boveri & Cie Gun drill
US4230429A (en) * 1977-07-06 1980-10-28 Komet Stahlhalter- Und Werkzeugfabrik Robert Breuning Gmbh Boring tool for making borings in solid metal material of workpieces
US4395169A (en) * 1979-07-04 1983-07-26 Mitsubishi Kinzoku Kabushiki Kaisha Drill bit
US4628584A (en) * 1985-01-28 1986-12-16 The Dow Chemical Company Method of removing fibers protruding into bores
US4966503A (en) * 1989-05-30 1990-10-30 The Boeing Company Drill bit for drilling a hole in layered material of different hardness
US5092716A (en) * 1989-11-25 1992-03-03 Omi Kogyo Co., Ltd. Drill and method for using the same
EP1525937A2 (en) * 2003-10-23 2005-04-27 Ishihara Kikai Kogyo Co. Ltd. Non-core type bit, non-core drill apparatus, and method of supplying cooling water thereto
EP1525937A3 (en) * 2003-10-23 2006-04-12 Ishihara Kikai Kogyo Co. Ltd. Non-core type bit, non-core drill apparatus, and method of supplying cooling water thereto
EP2006043A1 (en) * 2006-04-07 2008-12-24 UNITAC, Incorporated Deep hole drilling machine
US20090297285A1 (en) * 2006-04-07 2009-12-03 Unitac, Inc. Deep hole drilling machine
EP2006043A4 (en) * 2006-04-07 2011-01-19 Unitac Inc DEEP HOLE DRILLING MACHINE

Also Published As

Publication number Publication date
FR1416995A (fr) 1965-11-05
DK105902C (da) 1966-11-21
GB1084269A (xx) 1900-01-01
DE1477730B2 (de) 1971-07-01
AT254655B (de) 1967-06-12
BE656908A (xx) 1965-04-01
BR6464000D0 (pt) 1973-03-01
NL6413738A (xx) 1965-06-15
CH446012A (de) 1967-10-31
FI41791B (xx) 1969-10-31
DE1477730A1 (de) 1969-07-24

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SANTRADE LTD., ALPENQUAI 12, CH-6002, LUCERNE, SWI

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SANDVIK AKTIEBOLAG, A CORP. OF SWEDEN;REEL/FRAME:004085/0132

Effective date: 19820908