US20170274503A1 - Grinding element, method for producing the grinding element and injection-molding tool for carrying out the method - Google Patents

Grinding element, method for producing the grinding element and injection-molding tool for carrying out the method Download PDF

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Publication number
US20170274503A1
US20170274503A1 US15/503,797 US201415503797A US2017274503A1 US 20170274503 A1 US20170274503 A1 US 20170274503A1 US 201415503797 A US201415503797 A US 201415503797A US 2017274503 A1 US2017274503 A1 US 2017274503A1
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US
United States
Prior art keywords
grinding element
main body
molding
axis
blades
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.)
Abandoned
Application number
US15/503,797
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English (en)
Inventor
Bernd Stuckenholz
Nicolas Huth
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.)
PFERD Milwaukee Brush Co Inc
Original Assignee
PFERD Milwaukee Brush Co Inc
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 PFERD Milwaukee Brush Co Inc filed Critical PFERD Milwaukee Brush Co Inc
Assigned to PFERD MILWAUKEE BRUSH COMPANY, INC. reassignment PFERD MILWAUKEE BRUSH COMPANY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HUTH, NICOLAS, STUCKENHOLZ, BERND
Assigned to AUGUST RUEGGEBERG GMBH & CO. KG reassignment AUGUST RUEGGEBERG GMBH & CO. KG CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE NAME AND ADDRESS PREVIOUSLY RECORDED AT REEL: 041713 FRAME: 0434. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT . Assignors: HUTH, NICOLAS, STUCKENHOLZ, BERND
Assigned to PFERD MILWAUKEE BRUSH COMPANY, INC. reassignment PFERD MILWAUKEE BRUSH COMPANY, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AUGUST RUEGGEBERG GMBH & CO. KG
Publication of US20170274503A1 publication Critical patent/US20170274503A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/02—Wheels in one piece
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D18/00—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for
    • B24D18/0063—Manufacture of grinding tools or other grinding devices, e.g. wheels, not otherwise provided for by extrusion

Definitions

  • ceramic abrasive particles produced according to the so-called sol-gel method, in bound grinding elements or in coated abrasives. Furthermore, it is known to produce, by means of the sol-gel method, geometrically defined abrasive particles, having for instance a triangular shape. Grinding tools equipped therewith are more aggressive and more stable than conventional tools equipped with sol-gel abrasives.
  • the grinding element according to the invention is produced in one piece in an injection molding process, wherein the disk-shaped main body and the blades formed thereon are made of hard materials.
  • the individual blades are arranged immediately behind a usually cylindrical opening in the main body such that the rake face of the respective blade immediately adjoins the wall of the opening and runs in the direction of the extension of said opening such that the rake angle is formed.
  • a particularly favorable arrangement that allows the best possible cutting effect to be achieved is obtained with a grinding element in which the openings are arranged, with their respective axes, on a first curve, which, seen from a starting point adjacent to the center axis to an outer end, has the shape of a spiral; in which the first curve has the shape of an Archimedean spiral; and in which the first curve has the shape of a spiral with a progressive pitch towards the outer end as the blades have a smaller radial offset with respect to the blade arranged therebehind or in front thereof
  • the further development of the grinding element such that openings are provided that are arranged on a second curve adjoining the outer end of the first curve and extending in the shape of a partial spiral across less than a circumference of the main body and/or such that openings are provided that are arranged on an outer circular curve forms the transition towards the outer edge of the grinding element.
  • FIG. 7 shows a plan view illustrating the position of the blade in relation to the opening preceding said blade
  • FIG. 9 shows a cross-section through the cutting edge according to FIG. 8 according to section line IX-IX in FIG. 8 ;
  • Said injection-molding tool 2 comprises a tool lower part 3 and a tool upper part 4 that are in engagement with each other when the tool 2 is closed.
  • the tool upper part 4 is composed of two parts, comprising an inner molding plate 4 ′ and an upper closing plate 4 ′′.
  • the lower part 3 and the molding plate 4 ′ together define a molding space 5 in which the grinding element 1 is molded by injection molding. Seen in a plan view, the molding space 5 is circular and has a center axis 6 .
  • an inlet 7 is provided for an injection molding material 8 to be injected by means of an injection molding machine, said inlet 7 running concentrically to said axis 6 .
  • the section 9 ′ of the bolt 9 arranged in the recess 12 is cylindrical.
  • said section 9 ′ of the bolt 9 is conical. If the section 9 ′ tapers in a direction away from the tool lower part 3 , then the bolt 9 needs to be arranged in the tool lower part 3 to ensure that the grinding element 1 is easily removable from the mold.
  • a cutting edge 27 is formed by the intersection of the rake face 20 and the back (flank) 21 of the blade 19 , wherein said cutting edge 27 is offset outwardly with respect to the first curve 14 or the second curve 17 or the circular curve 18 .
  • this is shown in an x-y-z coordinate system the y-axis of which passes through the respective axis 13 of a drill hole 10 , and therefore through the opening 26 and the center axis 6 of the grinding element 1 .
  • the x-axis is perpendicular thereto and to the axis 13 .
  • the z-axis which is only outlined in FIG.
  • the wall 28 of the opening 26 and the cutting edge do not coincide in the plan view as shown in FIGS. 6 and 7 for a partially cylindrical rake face 20 .
  • the graphic representation of the cutting edge 27 must be drawn from the wall 28 of the opening 26 back into the back (flank) 21 of the blade 19 as shown in the illustration according to FIGS. 8 and 9 .
  • the cutting edge 27 is curved from the wall 28 of the opening 26 towards the latter, as can be seen from FIGS. 10 and 11 .
  • FIGS. 8 and 11 showing partially conical designs of the rake faces 20 with cutting edges 27 , the same reference numerals were used as for the partially cylindrical design of the rake faces 20 with cutting edges 27 described above to ensure clarity of the description.
  • a cutting edge 27 is obtained that runs obliquely to the cutting speed vector formed by the x-axis to reduce dynamic cutting forces caused when the cutting edge 27 penetrates into a material to be ground.
  • This design ensures that the cutting edge 27 penetrates into said material particularly smoothly.
  • the end section 22 is offset inwardly with respect to the x-axis, in other words the cutting speed vector, in such a way that a collision of the side flanks 23 or 24 of the blade 19 with a workpiece during cut formation is safely prevented.
  • the respective opening 26 is arranged—with respect to the direction of rotation in the cutting process—in such a way as to precede the cutting edge 27 and the rake face 20 of the associated blade 19 , allowing chips to be carried away through said opening 26 .
  • a so-called feed stock in other words an initial material is produced.
  • Said initial material contains organic binding agents that will become moldable or injection-moldable when heated.
  • Organic binding agents of this type are high polymers such as polyolefins, polyamides or polyacrylates and suitable softeners such as phthalates, paraffins or polyethylene glycols added to reduce the melt viscosity.
  • a hard material in the form of particles is admixed to these organic binding agents, wherein said particles are either Al 2 O 3 or ZrO 2 or Si 3 N 4 or SiC particles, or tungsten carbide particles coated with cobalt.
  • the so-called feed stock is produced in an extruder by mixing and kneading. In this process, the hard material particles are dispersed in the high polymers.
  • the initial material is heated in an injection molding machine and injected into the injection-molding tool 2 where the main body 25 is molded to obtain the numerous blades 19 , which are formed and arranged in accordance with the above description, and openings 26 , which are in each case associated to a respective one of the blades 19 .
  • the organic binding agents of said raw component are removed using conventional solvents and/or by means of a heat treatment.
  • the solvents are removed at a temperature of 510° C. and in the presence of ambient air.
  • SiC 1900° C. to 2200° C. in an argon inert gas atmosphere without pressure
  • WC—Co 1250° C. to 1500° C. in an argon inert gas atmosphere, 1 to 50 bar.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
US15/503,797 2014-08-14 2014-08-14 Grinding element, method for producing the grinding element and injection-molding tool for carrying out the method Abandoned US20170274503A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2014/067417 WO2016023586A1 (de) 2014-08-14 2014-08-14 SCHLEIFELEMENT, VERFAHREN ZUR HERSTELLUNG DES SCHLEIFELEMENTES UND SPRITZGIEß-WERKZEUG ZUR DURCHFÜHRUNG DES VERFAHRENS

Publications (1)

Publication Number Publication Date
US20170274503A1 true US20170274503A1 (en) 2017-09-28

Family

ID=51390102

Family Applications (1)

Application Number Title Priority Date Filing Date
US15/503,797 Abandoned US20170274503A1 (en) 2014-08-14 2014-08-14 Grinding element, method for producing the grinding element and injection-molding tool for carrying out the method

Country Status (8)

Country Link
US (1) US20170274503A1 (de)
EP (1) EP3180164B1 (de)
AU (1) AU2014403587A1 (de)
BR (1) BR112017002821A2 (de)
ES (1) ES2665678T3 (de)
PL (1) PL3180164T3 (de)
TR (1) TR201806792T4 (de)
WO (1) WO2016023586A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200398402A1 (en) * 2017-11-21 2020-12-24 3M Innovative Properties Company Coated abrasive disc and methods of making and using the same
CN114589777A (zh) * 2022-03-15 2022-06-07 无锡学院 阿基米德螺旋线齿形结构的热磨机磨片及其设计方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3724106A1 (de) * 1987-07-21 1989-02-02 Richard Hahn Diamant Werkzeuge Verfahren zum herstellen einer planschleifscheibe sowie nach diesem verfahren hergestellte planschleifscheibe zum bearbeiten von hartstoffen
USRE37997E1 (en) * 1990-01-22 2003-02-18 Micron Technology, Inc. Polishing pad with controlled abrasion rate
US6280309B1 (en) * 1995-10-19 2001-08-28 Norton Company Accessories and attachments for angle grinder
ES2248824T3 (es) * 1995-12-08 2006-03-16 Norton Company Placas de soporte para discos abrasivos.
GB201210230D0 (en) * 2012-06-11 2012-07-25 Element Six Ltd Method for making tool elements and tools comprising same

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200398402A1 (en) * 2017-11-21 2020-12-24 3M Innovative Properties Company Coated abrasive disc and methods of making and using the same
CN114589777A (zh) * 2022-03-15 2022-06-07 无锡学院 阿基米德螺旋线齿形结构的热磨机磨片及其设计方法

Also Published As

Publication number Publication date
BR112017002821A2 (pt) 2018-01-30
AU2014403587A1 (en) 2017-03-23
EP3180164B1 (de) 2018-02-28
TR201806792T4 (tr) 2018-06-21
ES2665678T3 (es) 2018-04-26
EP3180164A1 (de) 2017-06-21
WO2016023586A1 (de) 2016-02-18
PL3180164T3 (pl) 2018-08-31

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AS Assignment

Owner name: PFERD MILWAUKEE BRUSH COMPANY, INC., WISCONSIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:STUCKENHOLZ, BERND;HUTH, NICOLAS;REEL/FRAME:041713/0434

Effective date: 20140818

AS Assignment

Owner name: AUGUST RUEGGEBERG GMBH & CO. KG, GERMANY

Free format text: CORRECTIVE ASSIGNMENT TO CORRECT THE ASSIGNEE NAME AND ADDRESS PREVIOUSLY RECORDED AT REEL: 041713 FRAME: 0434. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT;ASSIGNORS:STUCKENHOLZ, BERND;HUTH, NICOLAS;REEL/FRAME:043275/0209

Effective date: 20140818

AS Assignment

Owner name: PFERD MILWAUKEE BRUSH COMPANY, INC., WISCONSIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AUGUST RUEGGEBERG GMBH & CO. KG;REEL/FRAME:043599/0736

Effective date: 20170914

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION