EP3906130A1 - Outil de brochage hélicoïdal intérieur - Google Patents

Outil de brochage hélicoïdal intérieur

Info

Publication number
EP3906130A1
EP3906130A1 EP19832947.6A EP19832947A EP3906130A1 EP 3906130 A1 EP3906130 A1 EP 3906130A1 EP 19832947 A EP19832947 A EP 19832947A EP 3906130 A1 EP3906130 A1 EP 3906130A1
Authority
EP
European Patent Office
Prior art keywords
tool
calibration
broaching
section
hard metal
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.)
Pending
Application number
EP19832947.6A
Other languages
German (de)
English (en)
Inventor
Andreas Berktold
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.)
Forst Technologie GmbH and Co KG
Original Assignee
Forst Technologie GmbH and Co KG
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 Forst Technologie GmbH and Co KG filed Critical Forst Technologie GmbH and Co KG
Publication of EP3906130A1 publication Critical patent/EP3906130A1/fr
Pending legal-status Critical Current

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
    • B23D43/00—Broaching tools
    • B23D43/005—Broaching tools for cutting helical grooves
    • 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
    • B23D43/00—Broaching tools
    • B23D43/02—Broaching tools for cutting by rectilinear movement

Definitions

  • the invention relates to an internal swirl broaching len with the Merk specified in claim 1.
  • Internal swirl clearing tools are known from DE 23 38 821 C2, the
  • a broaching tool is known from US 3,815,193.
  • a broach made of hard metal is known from EP 1 477 255 Al.
  • a method for producing grooved inner profiles in hardened workpieces and broaches suitable for this are known from DE 36 21 422 Al.
  • the calibration tool section of the internal swirl broaching tool is used for finishing, i.e. for removing small quantities of material from a workpiece to be machined, for finishing it.
  • Cutting speeds in tool processing with the internal swirl broaching tool are in particular in the range between 1 m / min to 12 m / min, for example in the range between 5 m / min to 10 m / min.
  • a calibration tool section of an internal swirl broaching tool does not necessarily have to be made from high-speed steel, which was previously the case due to the ductile properties of such high-speed steel.
  • hard metal is suitable as the material for the calibration tool section.
  • Machining of the calibration tool section with the required accuracy to produce high-precision internal helical gears can be carried out, in particular, with the aid of software, in particular by means of diamond grinding disks that are aligned in a controlled manner.
  • a grinding result when dressing the diamond grinding wheels for machining the hard metal calibration tool section can be monitored optically in particular to record an actual profile value of the grinding wheel.
  • the diamond grinding wheels can be dressed with high precision using diamond dressing tools.
  • a flank accuracy of the diamond grinding wheels can be maintained up to a tolerance of 1 mth.
  • a calibration tool section made of hard metal can be manufactured with manufacturing tolerances that correspond to those achieved in the prior art for calibration tool sections made of high-speed steel.
  • the clearing tool section of the internal swirl clearing tool can be made from high-speed steel.
  • the hard metal can have a density which is greater than 10.5 g / cm 3 , which is greater than 11 g / cm 3 , which is greater than 11.5 g / cm 3 , which is greater than 12 g / cm 3 , which is greater than 12.5 g / cm 3 , which is larger than 13 g / cm 3 , which is larger than 13.5 g / cm 3 , which is larger than 14 g / cm 3 , which is larger than 14.5 g / cm 3 or even can be even bigger.
  • the density of the hard metal can be in particular in the range between 12.0 and 15.0 g / cm 3 .
  • a tungsten carbide-cobalt hard metal can be used as the hard metal
  • Niobium carbide cobalt hard metal a tungsten carbide zirconium carbide carbon hard metal or a cermet can be used.
  • tungsten carbide titanium carbide, titanium nitrite, niobium carbide, tantalum carbide or vanadium carbide can also be used for the hard metal.
  • nickel and / or iron can also be used as the binding matrix.
  • the tungsten carbide grains of the hard metal can have an average grain size in the range between 0.1 gm and 25 gm and in particular in the range between 0.15 gm and 10 gm or in the range between 1 gm and 3 gm.
  • the calibration tool section and / or the pre-tool section can have a helical toothing with a plurality of gears.
  • Broach teeth according to claim 2, in particular of the calibration tool section with a positive rake angle have surprisingly also been found to be possible when using hard metal as a material.
  • Tungsten carbide clearing teeth with a positive rake angle also withstand the stresses when internal helical gears.
  • Some or all broaching teeth of the pre-broaching tool section and / or the calibration tool section also have a positive rake angle.
  • Both a base body of the tool and a possibly existing socket or sleeve can be provided with a coating.
  • a coating can serve in particular a wear reduction.
  • the coating can therefore be a wear protection coating.
  • the socket or sleeve is made of Hartme tall, this can be provided with a different coating than the base body.
  • FIG. 1 shows a side view and in the area of a calibration bushing partially broken to illustrate internal details and in the area of a fastening nut or a clamping ring for the calibration bushing partially in section an internal round profile broaching tool in the form of an internal twist broaching tool;
  • FIG. 2 shows the calibration sleeve of the tool according to FIG. 1 in a view similar to FIG. 1; 3 shows an axial longitudinal section of a detail III of the calibration bushing according to FIG. 2 in the region of two broach teeth arranged one behind the other in a broaching direction;
  • FIG. 4 shows the tool according to FIG. 1 with the calibration sleeve omitted
  • FIG. 5 the tool of FIG. 4 with an additional omitted fastening nut supply or omitted clamping ring.
  • An internal swirl broaching tool 1 is used for broaching inner circular profiles of gearwheels with helical teeth.
  • the tool 1 is rela tively to a workpiece, not shown in the drawing, in which the helical toothing is generated, in a broaching direction 2.
  • the tool 1 has a tool head section 3 on the left, to which a drive for moving the tool 1 in the broaching direction 2 can engage.
  • the functions of the clearing tool section 4 and the calibration tool section 5 basically correspond to those known from the prior art technology for internal swirl clearing tools. In this context, reference is made to DE 23 38 821 B2, EP 1 426 131 Al and
  • the calibration sleeve 5 is pushed onto a carrier section 6 of a base body of the tool 1 in FIG. 1 from the right.
  • the carrier Section 6 is firmly connected to the pre-clearing tool section 4 and can pass seamlessly into the tool head section 3.
  • a fastening nut 7 is used, which in FIG. 1 is screwed onto the carrier section 6 from the right and the calibration bushing 5 is located between a wall 8 of the fastening nut 7 and an opposing system. Shoulder 9 of the base body of the tool 1 clamps. The counterpart shoulder 9 simultaneously represents a transition section between the carrier section 6 and the pre-clearing tool section 4.
  • a clamping ring without thread can also be used to fix the calibration bushing 5 to the carrier section 6.
  • Broaching teeth of the pre-broaching tool section 4 are arranged in a helical manner along the longitudinal direction 10 of the tool 1 around teeth rows 11 in the broaching direction 2 in such a way that broaching teeth of successive helical tracks of the tooth rows 11 are each arranged obliquely one behind the other along broaching tracks 12.
  • Fig. 1 three such clearing tracks 12 are indicated by dashed lines.
  • An oblique course of the broaching tracks 12 corresponds to an oblique course of the oblique toothing to be produced in the workpiece.
  • the clearing tool section 4 on the one hand and the calibration bush 5 on the other hand each have a helical toothing, each with a plurality of gears.
  • a pitch distance in the clearing tool section 4 is smaller than in the calibration tool section 5.
  • the pitch distance in the clearing tool section 4 can also be the same as in the calibration tool section 5 and can also be larger than in the calibration - Tool section 5.
  • Fig. 3 shows in detail two clearing teeth 13 arranged one behind the other along a clearing path 12. These clearing teeth 13 of the calibration bushing 5 have a positive rake angle g. A cutting tooth edge 15 of these clearing teeth 13 with a positive rake angle g thus projects freely, seen along a radial direction, over a hollow cylindrical base body 16 of the calibration bushing 5.
  • the tool 1 has a tool end section 17, which is designed for connec tion with a bearing body of a broaching drive.
  • the calibration tool section 5 of the tool 1 is made of a hard metal, the density of which is greater than 10 g / cm 3 .
  • the hard metal can be a tungsten carbide dK obal th artm etal 1.
  • the hard metal can contain small amounts of other carbides, e.g. B. have vanadium carbide, chromium carbide or tantalum niobium carbide. These proportions of other carbides can be less than 2% by weight, can be less than 1.5% by weight, can be less than 1.0% by weight, can be less than 0.75% by weight and can also be less than 0.5% by weight.
  • Wol- framcarbide grain sizes can range between
  • 0.1 gm and 25 gm are and can be, for example, in the range around an average of 3 gm, 5 gm, 8 gm, 10 gm or 15 gm.
  • a cobalt content of the hard metal can range from 1% to 40% and in particular can range from 2% to 25%.
  • a tantalum-niobium carbide can also be larger than 5%, can be larger than 10% and can also be larger than 20%.
  • the hard metal may have proportions of other carbides or mixed carbides, e.g. B. titanium carbide or zirconium carbide.
  • the proportions of these mixed carbides can be between 0.5% and 25%, between 1% and 20%, between 5% and 15% and can also be around 10%.
  • a mixed carbide content can be less than 8% overall.
  • a mixed carbide content can alternatively be greater than 12%.
  • a cermet can also be used as the hard metal.
  • the Hartme tall can contain titanium carbide or titanium nitrite.
  • a binding matrix of such a hard metal can have nickel, cobalt and / or molybdenum.
  • titanium carbide, titanium nitrite, niobium carbide, tantalum carbide or vanadium carbide can also be used as hard material of the hard metal.
  • nickel or a cobalt-nickel mixture can also be used as the binary matrix for the hard metal.
  • a cobalt content of the hard metal can be in the range between 1% and 35% and in particular in the range between 5% and 25%, for example in the range of 15%.
  • nickel can also be used as the binding matrix.
  • An iron-containing mixture, for example an iron / nickel / cobalt mixture, can also be used as the binding matrix.
  • the calibration bushing 5 can be designed in such a way that all clearing teeth 13 have a positive rake angle.
  • the calibration bushing 5 can also have at least some broaching teeth with a negative rake angle and / or with a rake angle of 0 °.
  • a proportion of broaching teeth 13 with a positive rake angle in the number of all broaching teeth can be in the range between 5% and 100% and can for example be 10%, 20%, 30%, 40%, 50%, 60% , at 70%, at 80%, at 90%, at 100%.
  • the calibration tool section 5 When machining the workpiece, the calibration tool section 5 carries out a removal of small amounts of material for fine or very fine machining, that is to say finishing of the workpiece.
  • a cutting speed can range from 1 m / min to 12 m / min.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling, Broaching, Filing, Reaming, And Others (AREA)

Abstract

L'invention concerne un outil de brochage hélicoïdal intérieur (1) présentant une partie d'outil de pré-brochage (4) menant dans une direction (2) de brochage et une partie d'outil de calibrage (5) située en aval. Cette dernière est fabriquée entièrement à partir d'un métal dur, dont la densité est supérieure à 10 g/cm3. Cela permet d'obtenir un outil hélicoïdal intérieur dont la durée de vie, pour une puissance d'usinage donnée, est accrue.
EP19832947.6A 2019-01-03 2019-12-20 Outil de brochage hélicoïdal intérieur Pending EP3906130A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019200022.3A DE102019200022A1 (de) 2019-01-03 2019-01-03 Innen-Drallräumwerkzeug
PCT/EP2019/086683 WO2020141110A1 (fr) 2019-01-03 2019-12-20 Outil de brochage hélicoïdal intérieur

Publications (1)

Publication Number Publication Date
EP3906130A1 true EP3906130A1 (fr) 2021-11-10

Family

ID=69147665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19832947.6A Pending EP3906130A1 (fr) 2019-01-03 2019-12-20 Outil de brochage hélicoïdal intérieur

Country Status (6)

Country Link
US (1) US20220080518A1 (fr)
EP (1) EP3906130A1 (fr)
JP (1) JP2022516276A (fr)
CN (1) CN113260477A (fr)
DE (1) DE102019200022A1 (fr)
WO (1) WO2020141110A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019216593A1 (de) * 2019-10-29 2021-04-29 Forst Technologie Gmbh & Co. Kg Innen-Drallräumwerkzeug

Family Cites Families (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3276100A (en) 1961-04-10 1966-10-04 Nat Broach & Mach Broach
US3439398A (en) * 1966-02-23 1969-04-22 Colonial Broach & Machine Co Helically nicked broach
GB1269772A (en) * 1968-03-04 1972-04-06 Orenda Ltd Finishing broaching tool
US3795958A (en) 1972-08-01 1974-03-12 Lear Siegler Inc Gear tooth broach
US3815193A (en) * 1973-02-14 1974-06-11 E Moore Broaching tool
JPS5286088U (fr) * 1975-12-22 1977-06-27
DE3621422A1 (de) * 1986-06-26 1988-01-14 Hurth Masch Zahnrad Carl Verfahren zum herstellen von genuteten innenprofilen (passfedernuten, keilnaben) bei gehaerteten werkstuecken und dafuer geeignete raeumnadeln
EP0447996A1 (fr) * 1990-03-23 1991-09-25 Fässler Ag Outil de brochage
US5503506A (en) * 1993-06-24 1996-04-02 Hughes Aircraft Company High precision, high surface finish broaching tool
JP2001239425A (ja) * 2000-02-29 2001-09-04 Nachi Fujikoshi Corp ブローチ及びブローチ加工法
JP4730754B2 (ja) * 2000-10-27 2011-07-20 株式会社不二越 超硬ブローチ
DE50205927D1 (de) 2002-12-03 2006-04-27 Forst Technologie Gmbh & Co Kg Innen-Räumwerkzeug
US20040223825A1 (en) 2003-05-07 2004-11-11 Nachi-Fujikoshi Corp. Broach tool and broaching method
JP2004338009A (ja) * 2003-05-14 2004-12-02 Nachi Fujikoshi Corp 超硬ブローチ、ブローチ加工方法及びブローチ盤
JP2004345056A (ja) * 2003-05-23 2004-12-09 Nachi Fujikoshi Corp ブローチ工具の歯形修正方法
JP2005040871A (ja) 2003-07-23 2005-02-17 Fuji Heavy Ind Ltd ブローチ及びブローチ加工方法
JP4764460B2 (ja) * 2008-09-12 2011-09-07 三菱重工業株式会社 荒加工用ヘリカルブローチ
DE102008053156B4 (de) * 2008-10-24 2011-01-27 Spezialwerkzeuge Gmbh Zella-Mehlis Innenräumwerkzeug
DE102009016939A1 (de) * 2009-04-08 2009-10-29 Daimler Ag Gebautes Räumwerkzeug
CN201889532U (zh) * 2010-11-18 2011-07-06 重庆潍柴发动机厂 复合多排齿形拉刀
DE102011109106A1 (de) * 2011-08-02 2013-02-07 Hanspeter Epple Verfahren zum Bearbeiten eines Innenhohlraumes eines Strangpressprofiles und Vorrichtung hierfür
JP6190120B2 (ja) * 2013-02-14 2017-08-30 三菱重工工作機械株式会社 ヘリカルブローチ
JP6037880B2 (ja) * 2013-02-14 2016-12-07 三菱重工工作機械株式会社 ヘリカルブローチおよびヘリカルブローチ修繕方法
CN103537751B (zh) * 2013-10-25 2016-01-06 恒锋工具股份有限公司 一种渐开线花键拉刀
CN108672806A (zh) * 2018-05-30 2018-10-19 江阴市工具厂 一种硬齿面花键孔的刮削拉刀

Also Published As

Publication number Publication date
DE102019200022A1 (de) 2020-07-09
WO2020141110A1 (fr) 2020-07-09
JP2022516276A (ja) 2022-02-25
US20220080518A1 (en) 2022-03-17
CN113260477A (zh) 2021-08-13

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