WO2021013834A1 - Procédé de fabrication d'un outil d'enlèvement de copeaux à partir d'une ébauche et vis sans fin de rectification destinée à la fabrication d'un outil d'enlèvement de copeaux - Google Patents

Procédé de fabrication d'un outil d'enlèvement de copeaux à partir d'une ébauche et vis sans fin de rectification destinée à la fabrication d'un outil d'enlèvement de copeaux Download PDF

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Publication number
WO2021013834A1
WO2021013834A1 PCT/EP2020/070556 EP2020070556W WO2021013834A1 WO 2021013834 A1 WO2021013834 A1 WO 2021013834A1 EP 2020070556 W EP2020070556 W EP 2020070556W WO 2021013834 A1 WO2021013834 A1 WO 2021013834A1
Authority
WO
WIPO (PCT)
Prior art keywords
profile
reference profile
cutting tool
section
worm
Prior art date
Application number
PCT/EP2020/070556
Other languages
German (de)
English (en)
Inventor
Mirko THEUER
Berend Denkena
Original Assignee
Gottfried Wilhelm Leibniz Universität Hannover
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 Gottfried Wilhelm Leibniz Universität Hannover filed Critical Gottfried Wilhelm Leibniz Universität Hannover
Publication of WO2021013834A1 publication Critical patent/WO2021013834A1/fr

Links

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
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
    • B24B19/022—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements for helicoidal grooves
    • 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
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/02—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters
    • B24B3/021—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters of milling cutters with helical cutting edges
    • 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
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/02—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters
    • B24B3/022—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of milling cutters relief grinding of milling cutters

Definitions

  • the invention relates to a method for producing a cutting tool from a blank.
  • the invention relates to a grinding worm with a worm reference profile which has (a) a first reference profile section and (b) a second reference profile section.
  • Cutting tools are often made by grinding. It is necessary to carry out two or more grinding operations one after the other.Although this makes it possible to always select a grinding process that optimizes the corresponding grinding task, the disadvantage is that either the blank has to be re-clamped several times or the tool has to be changed got to. Both are undesirable, albeit inevitable.
  • the invention is based on the object of reducing the disadvantages of the prior art.
  • the invention solves the problem by a method for producing a cutting tool on a blank by generating grinding, wherein generating grinding is preferably carried out by means of a grinding worm that has a worm reference profile, and wherein the worm reference profile has no mirror plane of symmetry.
  • the invention solves the problem by a generic grinding worm, in which a difference angle between the first reference profile section and the second reference profile section is at least 25 °, in particular to- is at least 30 ° and / or in which the screw reference profile has no plane of symmetry and / or at least one profile angle is at least 25 ° at most, in particular 20 ° at most.
  • the advantage of the invention is that an increase in productivity is possible.
  • regrinding of worn cutting tools can also be carried out particularly easily.
  • the reason for this is that from the geometry of the grinding worm for the cutting position of the cutting tool, a geometry of a regrinding grinding worm can easily be derived, by means of which worn cutting tools can be reground.
  • Another advantage can be that the division accuracy of the ground workpieces is very high if the number of teeth on the workpiece is not a multiple of The number of flights of the worm is what constitutes a preferred embodiment of the invention.
  • a grinding worm is understood to mean a grinding tool which has at least one helically extending grinding section.
  • According to the invention is also a method for producing a cutting tool from a blank by generating grinding, wherein generating grinding takes place by means of a grinding worm which has a worm reference profile, the worm reference profile having a first reference profile section and a second reference profile section and wherein a difference angle between the first reference profile section and the second reference profile section is at least 25 °, in particular at least 30 °.
  • This screw reference profile preferably has no mirror plane of symmetry.
  • the screw reference profile can have more than two reference profile sections. In this case there are preferably at least three or exactly three or at least four or exactly four reference profile sections for which the entered relationship applies. There can also be more than four reference profile sections. There are preferably fewer than eight reference profile sections.
  • the reference profile sections are preferably linear, with deviations of ⁇ 2 ° being possible. However, it is favorable if the deviation is less than ⁇ 1 °.
  • the first reference profile section and the second reference profile section are preferably designed in such a way that a convex cutting tool flank and a concave cutting tool flank are produced when the cutting tool is manufactured.
  • first reference profile surface section runs at a first profile angle to a normal to a head line of the screw reference profile and the second reference profile section runs at a second profile angle to the normal to the head line.
  • the difference between the amounts of the profile angles is preferably at least 20 °, in particular at least 25 °, particularly preferably at least 30 °.
  • the second reference profile section is preferably arranged in such a way that it generates a rake face of the cutting tool when it is reached into the blank. It is favorable if the second profile angle is at most 25 °, in particular at most 20 °. An undercut then results on the rake face, which allows the chips to flow away when the cutting tool is used later.
  • the worm reference profile has a head line and a profile reference line, the head height distance between the head line and the profile reference line being so small that a tool is created whose rake face has the shape of a rolling trochoid.
  • a surface is created in the base of the later cutting tool, the shape of which can be described by a generating trochoid.
  • attempts are made to keep this area as small as possible, as it affects the mechanical strength of the gear.
  • this structure is very useful when not a gear is to be made but a cutting tool.
  • the profile reference line is the line in which the gap width is equal to the tooth gap.
  • the head line is the line of maximum distance to the profile reference line that runs through the worm reference profile.
  • the head height distance cannot be negative, but it can be zero, which is a preferred embodiment.
  • the screw reference profile has a basic reference profile section whose distance from the head line is greater than the distance from all other reference profile sections.
  • the basic reference profile section preferably has a profile angle to the normal to the head line which is at most 85 °. In other words it runs the basic reference profile section preferably in the technical sense essentially parallel to the profile reference line.
  • the screw reference profile has (a) a first profile flight and (b) a second profile flight, the second profile flight being arranged off-center to the first profile flight, so that an unevenly divided cutting tool is created.
  • the feature that the second profile passage is arranged eccentrically to the first profile passage is understood - if exactly two profile passages exist - in particular that a distance from the first profile passage to the second profile passage differs from the distance from the second profile passage to the first profile passage. Whilst an unevenly divided cutting tool is advantageous, unevenly divided gears are highly undesirable, so that worm reference profiles with two profiles are not known from gear manufacturing. Although double-flight worms can also be used in gear production, all flights have the same reference profile and the same pitch. In addition, to avoid the unequal division, gear numbers are used that do not represent a multiple of the number of gear teeth.
  • a number of teeth Z of the cutting tool is always an integral multiple of the number of turns G.
  • the number of teeth Z of the resulting cutting tool is less than 13, in particular less than 10.
  • the screw reference profile also has (c) a third profile flight, with (d) the three profile flights being arranged unequally divided.
  • the feature that the profile passages are arranged unevenly divided is understood in particular that of the distances (i) first profile passage to second profile passage, (ii) second profile passage to third profile passage and (iii) third profile passage to first profile passage at least two of the Distinguish distances from each other.
  • the two distances preferably differ by at least 2%, in particular at least 5%.
  • the screw reference profile also has (e) at least one fourth profile flight, with (d) the at least four profile flights being arranged unequally divided.
  • the profile passages are arranged unevenly divided is understood in particular that from the distances (i) first profile passage to second profile passage, (ii) second profile passage to third profile passage, (iii) third profile passage to fourth profile passage and ( iv) fourth profile passage to first profile passage at least two of the distances, in particular at least three of the distances differ from one another in pairs.
  • the distances preferably differ by at least 2%, in particular at least 5%.
  • the profile shift factor is preferably at most as large as x * min.
  • x * min is the profile shift factor at the undercut limit.
  • the profile shift factor is the profile shift divided by the normal module.
  • the normal module m n is the quotient of the normal division p n and the circle number p.
  • the profile shift is the distance between the profile reference line and the pitch circle cylinder.
  • Z is the number of teeth on the cutter.
  • the profile shift factor x * min at the undercut limit is the profile shift factor at which an undercut occurs at the base of the cutting tool.
  • a tool head height factor h ap o * is preferably less than 0.7, in particular at most 0.5, particularly preferably at most 0.3.
  • the tool head height factor is particularly favorable to zero.
  • the tool head height factor is defined in DIN 3960 from March 1987.
  • the reference worm profile of the grinding worm according to the invention preferably has one of the properties mentioned above.
  • the invention is tert erläu with reference to the accompanying drawings. It shows
  • FIG. 1 shows a three-dimensional view of a generating grinding machine according to the invention with a grinding worm according to the invention for carrying out a method according to the invention
  • FIG. 2a shows a screw reference profile which has a profile flight and also a
  • FIG. 3 shows a perspective side view of a grinding worm to explain multi-start grinding worms.
  • FIG. 1 shows a machine tool 10 according to the invention with a grinding worm 12 according to the invention for grinding a blank 14 from which a cutting tool, in the present case in the form of a milling cutter, is ground.
  • the process of dividing the cutting tool from the blank 14 corresponds in terms of kinematics to the grinding process for gears, but differs fundamentally with regard to the generated geometry of the cutting tool.
  • FIG. 2a shows a worm reference profile 16 of the grinding worm 12 (see FIG. 1).
  • the screw reference profile 16 has a first reference profile section 18.1 and a second reference profile section 18.2.
  • the first reference profile section 18.1 extends at a first profile angle a1 to a normal N on a head line K of the screw reference profile 16.
  • the second profile section 18.2 extends at a second profile angle a2 to the normal N.
  • the worm reference profile 16 has more than one thread G.
  • G 4.
  • a cutting tool 20 in the form of a milling cutter can be seen.
  • a number of teeth Z of the cutting tool 20 is always an integral multiple of the number of threads G.
  • a head height distance d This is so small that all rake faces 22.1, ..., 22. Z have the shape of a rolling trochoid.
  • the screw reference profile 16 has a basic reference profile section 18.3, the distance from which to the head line is greater than the distance from all of the reference profile sections.
  • the screw reference profile has four profile flights, each of which is equally divided.
  • a length PGangi of the first gear is equal to a length pGang2 of the second gear and this in turn is equal to a length pGang3 of the third gear. If, as in the present case, there is a fourth gear, then it applies to the length pGang4 that this is as great as the lengths of the other gears.
  • all profile courses are divided equally, where PG is the total length of all courses.
  • PG is the pitch of the worm, it does not mean the entire length of the worm, which is determined by the number of complete "revolutions" of the flights.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Milling Processes (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Gear Processing (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un outil d'enlèvement de copeaux (20) à partir d'une ébauche (14) par rectification, la rectification étant effectuée au moyen d'une vis sans fin de rectification (12), qui présente un profil de revêtement de vis sans fin (16). Selon l'invention, le profil de revêtement de vis sans fin ne présente pas de plan de symétrie spéculaire.
PCT/EP2020/070556 2019-07-25 2020-07-21 Procédé de fabrication d'un outil d'enlèvement de copeaux à partir d'une ébauche et vis sans fin de rectification destinée à la fabrication d'un outil d'enlèvement de copeaux WO2021013834A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102019120155.1A DE102019120155B4 (de) 2019-07-25 2019-07-25 Verfahren zum Herstellen eines Zerspanwerkzeugs aus einem Rohling und Schleifschnecke zum Herstellen eines Zerspanwerkzeugs
DE102019120155.1 2019-07-25

Publications (1)

Publication Number Publication Date
WO2021013834A1 true WO2021013834A1 (fr) 2021-01-28

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PCT/EP2020/070556 WO2021013834A1 (fr) 2019-07-25 2020-07-21 Procédé de fabrication d'un outil d'enlèvement de copeaux à partir d'une ébauche et vis sans fin de rectification destinée à la fabrication d'un outil d'enlèvement de copeaux

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DE (1) DE102019120155B4 (fr)
WO (1) WO2021013834A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112705573A (zh) * 2021-03-25 2021-04-27 大连理工江苏研究院有限公司 用于硬质合金铣刀成型加工轧制装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1477931A1 (de) * 1965-10-02 1969-10-30 Mikromat Dresden Betrieb Anordnung eines Doppelkegelschleifkoerpers zum Hinterschleifen von Waelzfraesern
DE102016206721A1 (de) * 2015-04-22 2016-10-27 Kennametal Inc. Schneidwerkzeug zur verbesserten Spanabfuhr und Verfahren zu dessen Herstellung
DE102016008907A1 (de) * 2016-07-22 2018-01-25 Liebherr-Verzahntechnik Gmbh Verfahren zum Abrichten einer Schleifschnecke

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006008031B4 (de) * 2006-02-21 2007-11-15 Siemens Ag Verfahren zur Herstellung von Räumwerkzeugen

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1477931A1 (de) * 1965-10-02 1969-10-30 Mikromat Dresden Betrieb Anordnung eines Doppelkegelschleifkoerpers zum Hinterschleifen von Waelzfraesern
DE102016206721A1 (de) * 2015-04-22 2016-10-27 Kennametal Inc. Schneidwerkzeug zur verbesserten Spanabfuhr und Verfahren zu dessen Herstellung
DE102016008907A1 (de) * 2016-07-22 2018-01-25 Liebherr-Verzahntechnik Gmbh Verfahren zum Abrichten einer Schleifschnecke

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
WECK, M.NEUPERT, B.: "Exakte Berechnung der Zahnform schrägverzahnter Stirnräder", VDI-Z, vol. 125, September 1983 (1983-09-01), pages 653 - 656

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112705573A (zh) * 2021-03-25 2021-04-27 大连理工江苏研究院有限公司 用于硬质合金铣刀成型加工轧制装置
CN112705573B (zh) * 2021-03-25 2021-08-03 苏州用朴精密科技有限公司 用于硬质合金铣刀成型加工轧制装置

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DE102019120155A1 (de) 2021-01-28

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