WO2003000452A1 - Alesoir et procede d'alesage d'un trou utilisant cet alesoir - Google Patents
Alesoir et procede d'alesage d'un trou utilisant cet alesoir Download PDFInfo
- Publication number
- WO2003000452A1 WO2003000452A1 PCT/FR2002/002216 FR0202216W WO03000452A1 WO 2003000452 A1 WO2003000452 A1 WO 2003000452A1 FR 0202216 W FR0202216 W FR 0202216W WO 03000452 A1 WO03000452 A1 WO 03000452A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- cutting tool
- bore
- diameter
- section
- reamer
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D77/00—Reaming tools
- B23D77/02—Reamers with inserted cutting edges
- B23D77/04—Reamers with inserted cutting edges with cutting edges adjustable to different diameters along the whole cutting length
- B23D77/042—Reamers with inserted cutting edges with cutting edges adjustable to different diameters along the whole cutting length by means of oblique planes
-
- 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
- Y10T408/83—Tool-support with means to move Tool relative to tool-support
- Y10T408/85—Tool-support with means to move Tool relative to tool-support to move radially
- Y10T408/858—Moving means including wedge, screw or cam
- Y10T408/8588—Axially slidable moving-means
Definitions
- the present invention relates to a reamer and a reaming method using this reamer.
- Palésoir is of the type comprising a guide rod admitting a longitudinal axis of rotation, and a cutting tool slightly projecting relative to a surface of this rod, mounted between two sections of guide of the rod.
- the reaming method according to the invention makes it possible in particular to produce an axis hole in a piston, this axis hole being adapted to receive an axis of articulation of a connecting rod engaged inside a cavity of this piston.
- a piston 10a of this known type will now be described with reference to FIG. 1.
- the piston 10a has a bore 12a intended to receive a hinge pin of a connecting rod, not shown, the connecting rod being engaged and movable inside a cavity 14a of the piston 10a.
- the pin hole 12a passes through the piston
- the articulation axis of the connecting rod by deforming at each stroke, exerts a particularly intense stress on the points 16a of intersection of the axis hole 12a with the cavity 14a. In the long run, this constraint causes wear at these intersection points 16a, which can cause seizure of the axis of articulation of the connecting rod in the piston 10a.
- the present invention solves this problem.
- the subject of the present invention is a method of reaming an axis hole passing through a piston perpendicular to a direction of movement of the piston, the axis hole being adapted to receive a hinge pin d 'a connecting rod engaged inside a piston cavity.
- the method is characterized in that it consists in widening the bore diameter of the axis hole near the cavity, in order to obtain a "trumpet" shaped bore.
- a "trumpet" shaped bore will be described later with reference to FIG. 4. It makes it possible to considerably limit the stresses exerted by the articulation axis of the connecting rod on the points of intersection of the axis hole and the cavity of the piston while the piston is moving.
- the subject of the present invention is a reamer comprising a guide rod admitting a longitudinal axis of rotation, and a cutting tool slightly projecting with respect to a surface of this rod and mounted between two guide sections of this rod.
- the reamer is characterized in that it comprises adjustment means adapted to move the cutting tool inward or outward when reaming relative to the guide rod, to allow a controlled variation of the bore diameter. It is certainly known, in particular in documents GB-A-255,784 and US-A-1,451,742, to have cutting tools whose radial position could be adjusted to modify the diameter of the bore, the adjustment being made by complicated mechanisms and outside the boring process implemented, in particular during the withdrawal of the cutting tool from the workpiece. Such cutting tools cannot be used to make a "trumpet" shaped bore.
- the reamer according to the present invention is perfectly suited, in particular, to the implementation of a reaming process as briefly described above.
- the cutting tool is secured to a flexible support, fixed at one end in a cradle of the guide rod.
- the support comprises, opposite this end, an actuating surface, on which a lever integrated in the guide rod acts to tilt the support.
- the cutting tool moves slightly towards the outside of the guide rod, which makes it possible to vary the bore diameter in particular around the piston cavity.
- the adjustment means comprise a pusher forming the lever, the pusher sliding in a passage axial of the rod opening into the cradle, to cooperate with the actuation surface of the support.
- the support comprises a recess defining a bending zone, the support being elastically deformable in the vicinity of this recess.
- the tilting support is adapted to resume a predetermined rest position when it is not subjected to the stress of the adjustment means.
- the cutting tool is flush with the surface of the guide rod, which makes it possible to obtain a bore diameter corresponding to the diameter of the bore of the axis hole in the piston.
- the pusher has a beveled end, shaped to exert a push on the actuation surface of the support when the pusher slides in the axial passage, the push causing a deformation of the support at the bending zone.
- the reaming process comprises the following steps: reaming, to a nominal diameter, a first section of the axis hole, to a first position of the cutting tool located near the cavity ; - Continued reaming of the rest of the first section with gradual increase in the diameter of the bore by using adjustment means, up to the cavity; crossing the cavity until the cutting tool is positioned at the entrance to a second section of the axis hole; - reaming of the second section with progressive reduction of the reaming diameter by implementing adjustment means up to a second position of the cutting tool located near the cavity, the reaming diameter then returning to the nominal diameter ; and continued boring of the second section at nominal diameter.
- the method also consists in widening the bore diameter at the ends of the axis hole. This allows in particular to limit the stresses exerted by the hinge pin of the connecting rod on the ends of the piston pin hole.
- FIG. 1, already described, represents a conventional piston in section
- Figure 2 schematically shows a sectional reamer according to the invention
- - Figure 3 shows a piston after a form bore
- FIG. 4 schematically represents the reamer according to the invention during the boring of the axis hole near the cavity of a piston; and
- Figure 5 shows, to scale, an embodiment of a reamer according to the invention, mounted in a machine tool.
- FIG. 2 which will now be described shows a reamer 20 in section according to the invention.
- This reamer 20 is typically used to make the last finishing pass of the hole receiving the mounting axis of a connecting rod in a piston. It comprises a guide rod 22 admitting a longitudinal axis of rotation, this rod comprising two guide sections 24a, 24b.
- the guide section 24a located at the end of the rod 22 is of a diameter very slightly less than the diameter of the bore of the axis hole in the piston before the passage of the bore.
- the second guide section 24b has a diameter very slightly greater than the diameter of the first section 24a, and corresponds to the final diameter, called the nominal diameter, of the axis hole.
- the guide rod 22 includes a cradle 26 adapted to receive the support 28 of a cutting tool 30, this cradle 26 being produced between the two guide sections 24a, 24b previously described.
- the support 28 has a location 32 for the cutting tool 30, the cutting tool 30 being held in this location 32 by screws.
- the threads 33 provided for these screws are shown in Figure 5.
- the cradle 26 has a hollow portion 27 for positioning a base of the support 28, and a shoulder 29, on which is positioned one end 34 of this support 28 The end 34 of the support 28 is fixed to the guide rod 22 by screws in threads 36.
- the support 28 includes a recess 38 defining a bending zone, in the vicinity of which the support 28 is elastically deformable. This recess 38 is located opposite the shoulder 29 of the cradle 26.
- the guide rod 22 has an axial passage 40 in which a pusher 42 slides, forming means for adjusting the bore diameter.
- This axial passage 40 opens into the cradle 26 of the guide rod 22.
- the pusher 42 has a beveled end 44 which, when it slides in the axial passage 40 and enters the cradle 26, is likely to meet an actuating surface 46 of the support 28.
- This actuating surface 46 is defined at opposite the end 34 for fixing the support
- the beveled end 44 of the pusher 42 thus forms a ramp, and makes it possible to push the support 28.
- the support 28 then deforms at the level of the recess 38 forming a bending zone, which causes the tool to move. section 30 towards the outside of the guide rod 22.
- the pusher 42 is connected to a numerically controlled machine not shown here, which makes it possible to position the pusher 42 very precisely in the longitudinal passage 40. It is therefore possible by this advantageous arrangement to precisely regulate the tilting of the support 28, and therefore control the bore diameter.
- the bore which will now be described corresponds to a so-called "trumpet" bore for which the bore diameter of the axis hole 12b is widened, on the one hand near the cavity 14b of the piston 10b and d on the other hand at the ends E1, S2 of the pin hole 12b.
- axle hole 12b The rest of the axle hole 12b is reamed to a diameter d called the nominal diameter slightly greater than the drilling diameter of the axle hole.
- d the nominal diameter slightly greater than the drilling diameter of the axle hole.
- the axis hole 12b consists of two sections T1, T2 on either side of the cavity 14b of the piston 10b.
- the bore of the pin hole 12b is done symmetrically with respect to the cavity 14b.
- the bore diameter is adjusted substantially greater than the nominal diameter d.
- This adjustment is carried out by the aforementioned digital controls which are adapted to precisely position the pusher 42 in the cradle 26 which makes it possible to tilt the support 28 and therefore to substantially move the cutting tool 30 towards the outside of the rod guide 22.
- the cutting tool 30 is positioned at the first end E1 constituting the entrance to the first section T1 of the pin hole 12b.
- the reamer 20 then enters the input E1 of the first section T1 with simultaneous control of a progressive reduction in the bore diameter.
- This gradual reduction is of course programmed by means of the aforementioned digital controls. This progressive reduction continues until the cutting tool 30 reaches a position P3 located near the entry E1 of the first section T1, position P3 for which the bore diameter corresponds to the nominal diameter d. The boring of the first section T1 then continues at the nominal diameter d up to a position P1 of the cutting tool 30 located near the cavity 14b, this position P1 being programmed using digital controls.
- the rest of the first section T1 is reamed with a progressive increase in the bore diameter up to the cavity 14b.
- the diameter obtained corresponds, for example, to the bore diameter used at the inlet E1 of the first section T1 of the axis hole 12b.
- Figure 4 shows the reamer 20 at this stage of the boring process.
- the reamer 20 then crosses the cavity 14b until it is positioned on an inlet E2 of the second section T2 of the axis hole 12b.
- the bore of the second section T2 therefore begins with the bore diameter corresponding to the end of the bore of the first section T1.
- the reamer 20 then progresses in the second section T2 with progressive reduction of the bore diameter, to a position P2 of the cutting tool 30 located near the cavity 14b, the bore diameter then finding the diameter nominal d.
- the boring of the second section T2 then continues at the nominal diameter d up to a position P4 of the cutting tool 30 located near the second end S2, corresponding to the outlet of the axis hole 12b.
- FIG. 5 shows, to scale, a reamer 20 according to the invention, the reamer 20 being mounted in a machine tool 100.
- the cutting tool 30 is not shown.
- helical channels 48 used to supply lubricating oil during reaming.
- This machine tool 100 comprises a motor adapted to drive the reamer 20 in rotation, by means of ball bearings 102. It further comprises a shaft 104, adapted to position the pusher 42 in the axial passage 40. This shaft 104 is controlled by the aforementioned digital controls.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cutting Tools, Boring Holders, And Turrets (AREA)
- Drilling And Boring (AREA)
- Milling, Broaching, Filing, Reaming, And Others (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02780844A EP1417068A1 (fr) | 2001-06-26 | 2002-06-26 | Alesoir et procede d'alesage d'un trou utilisant cet alesoir |
US10/481,789 US20040223822A1 (en) | 2001-06-26 | 2002-06-26 | Reamer and method for reaming a hole using said reamer |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0108408A FR2826304B1 (fr) | 2001-06-26 | 2001-06-26 | Alesoir et procede d'alesage d'un trou utilisant cet alesoir |
FR01/08408 | 2001-06-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003000452A1 true WO2003000452A1 (fr) | 2003-01-03 |
Family
ID=8864775
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2002/002216 WO2003000452A1 (fr) | 2001-06-26 | 2002-06-26 | Alesoir et procede d'alesage d'un trou utilisant cet alesoir |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040223822A1 (fr) |
EP (1) | EP1417068A1 (fr) |
FR (1) | FR2826304B1 (fr) |
WO (1) | WO2003000452A1 (fr) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5902753B2 (ja) * | 2014-05-28 | 2016-04-13 | ファナック株式会社 | 切上げ・切込み運動または円運動挿入機能を有する数値制御装置 |
JP7407706B2 (ja) * | 2017-11-14 | 2024-01-04 | ケトコーポレーション,エス.エー. | 内部チャネルを機械加工するための装置およびそれぞれの操作方法 |
CN114472961B (zh) * | 2022-01-29 | 2023-08-08 | 王力安防科技股份有限公司 | 一种锁头孔扩孔定位器及带有该定位器的扩孔装置 |
CN114700514A (zh) * | 2022-03-15 | 2022-07-05 | 东方电气(广州)重型机器有限公司 | 一种换热管与管板封口焊后内孔加工装置及方法 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1451742A (en) * | 1922-11-23 | 1923-04-17 | Miller Paul | Expanding reamer |
GB255784A (en) * | 1926-04-19 | 1926-07-29 | Whitworth & Co | Improvements relating to boring bars and like cutter holders for machine tools |
US4357846A (en) * | 1979-09-03 | 1982-11-09 | Ansaldo Societa Per Azioni | Reamer for hollow shafts |
US4867619A (en) * | 1988-10-07 | 1989-09-19 | Colonial Tool Operations Division Of Textron Canada Ltd. | High speed spindle with adjustable tool |
Family Cites Families (28)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1592166A (en) * | 1924-04-21 | 1926-07-13 | Turner Reamer And Mfg Company | Reamer expanding pilot |
US1712079A (en) * | 1927-03-28 | 1929-05-07 | William J Kattrein | Adjustable pilot reamer |
US1733827A (en) * | 1927-08-30 | 1929-10-29 | Keystone Reamer & Tool Co | Reamer |
US2117525A (en) * | 1935-08-22 | 1938-05-17 | Sunnen Joseph | Reamer |
US2138897A (en) * | 1935-12-23 | 1938-12-06 | David S Anthony | Reamer |
US2394612A (en) * | 1943-04-13 | 1946-02-12 | Jr Frederick E Horne | Burring tool |
US2355965A (en) * | 1943-07-21 | 1944-08-15 | Frishette Stanton | Reamer |
US2381899A (en) * | 1943-08-21 | 1945-08-14 | James H Gracey | Expansion reamer |
US2461436A (en) * | 1944-11-17 | 1949-02-08 | Offen & Company Ltd | Cutting tool |
GB603239A (en) * | 1945-06-21 | 1948-06-11 | Brown David & Sons Ltd | Improvements in or relating to reamers or boring bars |
US2476019A (en) * | 1946-10-01 | 1949-07-12 | Auer William | Expansion reamer |
CH424432A (de) * | 1965-01-29 | 1966-11-15 | Fischer Ag Georg | Gewindeschneidkluppe zum Schneiden von konischen Gewinden auf Rohrenden |
US3499352A (en) * | 1968-04-18 | 1970-03-10 | Valeron Corp | Automatic boring bar adjustment means |
US3740161A (en) * | 1970-05-18 | 1973-06-19 | Valeron Corp | Automatic cutting tool adjustment means and method |
US3918826A (en) * | 1974-08-22 | 1975-11-11 | Kennametal Inc | Boring tool having retractable cartridge |
DE2523460C2 (de) * | 1975-05-27 | 1982-07-08 | The Valeron Corp., Detroit, Mich. | Vorrichtung zum Gewindeschneiden |
DE2804698C2 (de) * | 1978-02-03 | 1982-08-12 | Samson Ag, 6000 Frankfurt | Bohrkopf |
JPS6135365Y2 (fr) * | 1980-04-30 | 1986-10-15 | ||
JPS5761407A (en) * | 1980-07-10 | 1982-04-13 | Toyoda Mach Works Ltd | Boring quill |
JPS57114305A (en) * | 1980-12-27 | 1982-07-16 | Toyoda Mach Works Ltd | Boring quill |
DE3234238A1 (de) * | 1982-09-15 | 1984-03-15 | August Beck GmbH & Co, 7472 Winterlingen | Aufbohrer mit wendeplatte |
DE3314126C2 (de) * | 1983-04-19 | 1985-12-05 | GTE Valeron Corp. (eine Gesellschaft n.d.Ges.d. Staates Delaware), Troy, Mich. | Werkzeughalter |
US4599020A (en) * | 1984-08-23 | 1986-07-08 | Cargill Detroit Corporation | Deburring system |
DE3530696A1 (de) * | 1985-08-28 | 1987-03-12 | Kuehn Praezisionswerkzeug | Werkzeug fuer die spanabhebende bearbeitung |
JPH08505093A (ja) * | 1992-12-30 | 1996-06-04 | コメート プレチジオーンスヴェルクツォイゲ ローベルト ブロイニング ゲゼルシャフト ミット ベシュレンクテル ハフツング | 切削プレートのための締めつけ保持器 |
US5427480A (en) * | 1994-04-25 | 1995-06-27 | Valenite Inc. | Boring tool having an adjustable cutter element |
US6247878B1 (en) * | 1999-10-12 | 2001-06-19 | Kennametal Pc Inc. | Device and method for adjusting the position of cutting inserts mounted in a cutting tool |
DE19951658A1 (de) * | 1999-10-27 | 2001-05-10 | Wohlhaupter Gmbh | Werkzeughalter |
-
2001
- 2001-06-26 FR FR0108408A patent/FR2826304B1/fr not_active Expired - Fee Related
-
2002
- 2002-06-26 US US10/481,789 patent/US20040223822A1/en active Pending
- 2002-06-26 WO PCT/FR2002/002216 patent/WO2003000452A1/fr not_active Application Discontinuation
- 2002-06-26 EP EP02780844A patent/EP1417068A1/fr not_active Withdrawn
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1451742A (en) * | 1922-11-23 | 1923-04-17 | Miller Paul | Expanding reamer |
GB255784A (en) * | 1926-04-19 | 1926-07-29 | Whitworth & Co | Improvements relating to boring bars and like cutter holders for machine tools |
US4357846A (en) * | 1979-09-03 | 1982-11-09 | Ansaldo Societa Per Azioni | Reamer for hollow shafts |
US4867619A (en) * | 1988-10-07 | 1989-09-19 | Colonial Tool Operations Division Of Textron Canada Ltd. | High speed spindle with adjustable tool |
Also Published As
Publication number | Publication date |
---|---|
EP1417068A1 (fr) | 2004-05-12 |
FR2826304B1 (fr) | 2003-10-24 |
FR2826304A1 (fr) | 2002-12-27 |
US20040223822A1 (en) | 2004-11-11 |
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