EP3243601B1 - Grinding wheel for grinding spiral-shaped profiles - Google Patents

Grinding wheel for grinding spiral-shaped profiles Download PDF

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Publication number
EP3243601B1
EP3243601B1 EP17425033.2A EP17425033A EP3243601B1 EP 3243601 B1 EP3243601 B1 EP 3243601B1 EP 17425033 A EP17425033 A EP 17425033A EP 3243601 B1 EP3243601 B1 EP 3243601B1
Authority
EP
European Patent Office
Prior art keywords
grinding wheel
disc
abrasive
spiral
grinding
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.)
Active
Application number
EP17425033.2A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3243601A1 (en
Inventor
Angelo Radicioni
Reno Ortolani
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.)
Umbragroup SpA
Original Assignee
Umbragroup SpA
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Publication date
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Publication of EP3243601A1 publication Critical patent/EP3243601A1/en
Application granted granted Critical
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • 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
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/04—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic
    • B24D3/14—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially inorganic ceramic, i.e. vitrified bondings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D3/00—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents
    • B24D3/02—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent
    • B24D3/20—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents the constituent being used as bonding agent and being essentially organic
    • B24D3/22—Rubbers synthetic or natural
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D5/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting only by their periphery; Bushings or mountings therefor
    • B24D5/02—Wheels in one piece

Definitions

  • This invention relates to a grinding wheel for grinding spiral-shaped profiles, and in particular (but not necessarily) spiral-shaped profiles of recirculating ball screws, as disclosed for example in document EP 1 784 282 A1 , which is the basis for the preamble of appended claim 1.
  • the spiral-shaped tracks for the rolling of balls in recirculating ball screw couplings result in high pressures and require high machining precision, so it is often necessary to grind the tracks.
  • the grinding is usually achieved using a monolithic grinding wheel with a homogeneous grain and structure through which, by means of suitable parameters, roughing and finishing steps are performed with the same grinding wheel and the same positioning of the piece; obviously, it is necessary to find compromises to obtain the final roughness and the required accuracy on the thread at the expense of the processing times so as to avoid excessive elongation of the screw shaft which would adversely affect the requested precision and quality.
  • first grinding wheel with a larger grain size defining a roughing action
  • second grinding wheel with a smaller grain size for finishing the track.
  • pairs of spiral-shaped tracks is also known, defining a so-called "double thread" by using double disc grinding wheels, wherein a first double disc grinding wheel, made with a material with large grain size, defines a first roughing step and this is then replaced with a finishing grinding wheel with a small grain size, which also has two discs alongside each other.
  • the technical purpose of the invention is to provide a grinding wheel for grinding spiral-shaped profiles which overcomes the above-mentioned drawbacks.
  • the aim of the invention is to provide a grinding wheel for grinding spiral-shaped profiles which is suitable for achieving a greater operational efficiency.
  • Another aim of the invention is to provide a grinding wheel for grinding spiral-shaped profiles which has an optimum geometrical stability during use.
  • the numeral 1 denotes in its entirety a grinding wheel for grinding spiral-shaped profiles according to this invention.
  • the grinding wheel 1 is positioned with the relative axis of rotation "X" almost parallel to the axis of rotation "Y" of the screw 2, in particular inclined at an angle substantially equal to the spiral angle of spiral-shaped profile (or spiral-shaped track) 3 of the screw 2. Moreover, the grinding wheel 1 comes into contact with the profile of at least two grooves 4a, 4b adjacent to the track 3, thus achieving the grinding.
  • the two outer abrasive profiles 5, 6 define, at least virtually, two coaxial discs 1a, 1b forming the operational part of the grinding wheel 2, and coupled to each other in a rigid fashion in such a way that the grinding wheel 1 forms a rigid single block.
  • the two discs 1a, 1b have different abrasive properties to define different degrees of surface finishing of the grooves 4a, 4b.
  • the abrasive discs 1a, 1b are made of abrasive material of the ceramic type.
  • this advantageous aspect results in the fact that the first disc 1a, positioned in front of the feed direction "A" of the grinding wheel 1 relative to the spiral-shaped track 3, defines a roughing disc whilst the other disc 1b defines a finishing disc.
  • the two discs 1a, 1b have different grain size and/or abrasive type of and/or different density and/or structure in such a way as to obtain different surface roughness values of the grooves 4a, 4b.
  • the roughing disc has a grain size of between 80 and 100, whilst the finishing disc 1b has a grain size of between 120 and 140.
  • the two discs 1a, 1b have structures and binders which are different to each other, so as to obtain different surface roughness effects, as the first disc la achieves a roughing effect whilst the second disc 1b achieves a finishing effect.
  • the abrasive roughing disc 1a is made of ceramic material whilst the other abrasive disc 1b is made of rubber.
  • the two abrasive discs 1a, 1b are coupled to each other by reversible connecting means.
  • the reversible connecting means comprise one or more connecting screws.
  • the abrasive discs members 1a, 1b are coupled to each other in a permanent fashion by gluing.
  • the abrasive discs 1a, 1b have outer profiles, in transversal cross-section along a plane passing through the axis of rotation X" "of the grinding wheel 1, which are geometrically different to each other.
  • the finishing disc 1b has a nominal outer profile, corresponding to the transversal profile of the groove 4a, 4b to be formed, whilst the roughing disc has a compensated outer profile, having a geometrical shape compensated relative to the transversal profile of the groove 4a, 4b to be obtained.
  • the two discs 1a, 1b (that is, the two outer abrasive profiles 5, 6) are engaged in respective grooves 4a, 4b adjacent to the spiral-shaped track 3 of the screw 2.
  • the screw 2 is then rotated about a relative axis "Y” and simultaneously rotates the grinding wheel 1 about the relative axis "X” and the feeding of the grinding wheel 1 along the axis "Y” of the screw 2 determines a permanent engaging of the grinding wheel 1 with the spiral-shaped track 3, and in particular with different stretches in succession of the spiral-shaped track 3.
  • the finishing disc 1b form a finishing of a second stretch of the spiral-shaped track 3 previously roughed by the roughing disc 1a.
  • the present invention achieves the preset aims, overcoming the drawbacks of the prior art.
  • the grinding wheel 1 allows the achievement of a complete processing (roughing + finishing) in a single pass, considerably reducing the operating times and also avoiding positioning problems which could arise, in the prior art, upon replacement of the roughing grinding wheel with the finishing grinding wheel.
  • the structure of the grinding wheel according to the invention increases the thermal capacity and the capacity to dissipate heat outwards, thus reducing the problems of heating and eliminating the risk of dimensional irregularities in the ground profiles.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP17425033.2A 2016-05-09 2017-03-15 Grinding wheel for grinding spiral-shaped profiles Active EP3243601B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITUA2016A003255A ITUA20163255A1 (it) 2016-05-09 2016-05-09 Mola per la rettifica di profili ad elica

Publications (2)

Publication Number Publication Date
EP3243601A1 EP3243601A1 (en) 2017-11-15
EP3243601B1 true EP3243601B1 (en) 2019-07-10

Family

ID=56990708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17425033.2A Active EP3243601B1 (en) 2016-05-09 2017-03-15 Grinding wheel for grinding spiral-shaped profiles

Country Status (5)

Country Link
EP (1) EP3243601B1 (es)
JP (1) JP6902882B2 (es)
ES (1) ES2746229T3 (es)
IT (1) ITUA20163255A1 (es)
TW (1) TWI722112B (es)

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB398519A (en) * 1932-03-07 1933-09-15 Johansson Ab C E Apparatus for grinding screw threads
US3093464A (en) * 1959-01-16 1963-06-11 Norton Co Magnetic abrasive wheels, method of making them, and machine tools for using them
CH538332A (de) * 1970-09-21 1973-06-30 Instr Zd Bolschevik Verfahren und Einrichtung zum Gewindeschleifen
JP3701416B2 (ja) * 1996-04-18 2005-09-28 Ｔｈｋ株式会社 ボールねじ軸の研削加工方法
JP3766496B2 (ja) * 1996-12-27 2006-04-12 Ｔｈｋ株式会社 送りねじ軸の研削加工装置
JP2005118897A (ja) * 2003-10-14 2005-05-12 Olympus Corp 研磨工具及び研磨方法
JP2005131760A (ja) * 2003-10-31 2005-05-26 Koyo Seiko Co Ltd ボールねじ溝加工工具およびボールねじ溝の加工方法
DE102004034542A1 (de) * 2004-07-16 2006-02-16 Zf Lenksysteme Gmbh Schleifscheibe zur Erzeugung von Außen- oder Innen-Kugelgewinden an Werkstücken
JP4815226B2 (ja) * 2006-02-01 2011-11-16 マニー株式会社 歯科用軸付砥石及びその製造方法
TWM324563U (en) * 2007-07-06 2008-01-01 Wang-Sheng Li Grinding wheel structure
DE102011055661B4 (de) * 2011-11-24 2022-10-20 Robert Bosch Gmbh VORRICHTUNG ZUM AUßENSCHLEIFEN VON KUGELGEWINDEN
JP6184032B2 (ja) * 2015-01-14 2017-08-23 株式会社ニートレックス本社 ねじ軸用研磨体およびそのセグメント

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
ES2746229T3 (es) 2020-03-05
TW201739550A (zh) 2017-11-16
JP6902882B2 (ja) 2021-07-14
TWI722112B (zh) 2021-03-21
JP2017202564A (ja) 2017-11-16
EP3243601A1 (en) 2017-11-15
ITUA20163255A1 (it) 2017-11-09

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