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EP0381662B1 - Procédé pour la fabrication de corps abrasifs - Google Patents

Procédé pour la fabrication de corps abrasifs Download PDF

Info

Publication number
EP0381662B1
EP0381662B1 EP90890016A EP90890016A EP0381662B1 EP 0381662 B1 EP0381662 B1 EP 0381662B1 EP 90890016 A EP90890016 A EP 90890016A EP 90890016 A EP90890016 A EP 90890016A EP 0381662 B1 EP0381662 B1 EP 0381662B1
Authority
EP
European Patent Office
Prior art keywords
polycarboxylic acids
weight
process according
mgo
hardening
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.)
Expired - Lifetime
Application number
EP90890016A
Other languages
German (de)
English (en)
Other versions
EP0381662A2 (fr
EP0381662A3 (en
Inventor
Friedrich Dr. Birkner
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.)
Magindag Steirische Magnesit Industrie AG
Original Assignee
Magindag Steirische Magnesit Industrie AG
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 Magindag Steirische Magnesit Industrie AG filed Critical Magindag Steirische Magnesit Industrie AG
Publication of EP0381662A2 publication Critical patent/EP0381662A2/fr
Publication of EP0381662A3 publication Critical patent/EP0381662A3/de
Application granted granted Critical
Publication of EP0381662B1 publication Critical patent/EP0381662B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • 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
    • B24D3/34—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties
    • B24D3/342—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent
    • B24D3/344—Physical features of abrasive bodies, or sheets, e.g. abrasive surfaces of special nature; Abrasive bodies or sheets characterised by their constituents characterised by additives enhancing special physical properties, e.g. wear resistance, electric conductivity, self-cleaning properties incorporated in the bonding agent the bonding agent being organic
    • 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
    • B24D3/12—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 water-setting, e.g. concrete
    • 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
    • B24D3/28—Resins or natural or synthetic macromolecular compounds

Definitions

  • the invention relates to a method for producing abrasive articles with granular abrasives embedded in a binder, such as e.g. SiC, corundum, Al2O3 or B4C, plastic and MgO and MgCl2 being used as binders.
  • a binder such as e.g. SiC, corundum, Al2O3 or B4C, plastic and MgO and MgCl2 being used as binders.
  • abrasive products For the manufacture of abrasive products, it is known to use granular abrasives with Sorel cement, i.e. a magnesite binder, which is formed by stirring burned magnesite (MgO) with a concentrated magnesium chloride solution, and allowing the mixture obtained to dry in molds.
  • Sorel cement i.e. a magnesite binder
  • MgO magnesite
  • a soap-like surface forms during operation, in particular when wet grinding, and constituents of the binder are lost due to their water solubility during grinding. For this reason, the service life of such grinding wheels, which are bonded exclusively with Sorel cement, is limited, and the effort for the production time is considerable in view of drying at ambient temperature.
  • the invention now aims to provide a method for producing grinding wheels of the type mentioned, which can be carried out without expensive hardening ovens and in which no critical conditions have to be observed during setting, so that the proportion of rejects in production is reduced becomes.
  • the invention aims to create a product with a significantly longer service life than a pure Sorel cement bond, which is also characterized by high breaking strength.
  • the invention consists essentially in that polycarboxylic acids are used as the plastic and that the shaped abrasive bodies are bonded or hardened without additional external heating by reaction of the polycarboxylic acids with Mg ions.
  • polycarboxylic acids are used as the plastic, the mixture thus obtained can set or harden at ambient temperature, and the expensive furnace control or the expensive furnace can be dispensed with.
  • polycarboxylic acids are generally water-soluble and are present as an aqueous solution before hardening results in good miscibility with the other components of the grinding wheel, so that better homogenization and thus uniform strength over the entire cross section of the grinding wheel is ensured.
  • the hardening or setting takes place by salt formation with magnesium ions, the addition being the Hardening or setting occurs through the Sorel cement bond.
  • the combination of magnesium ions and the carboxylate ions of the polycarboxylic acid leads to a particularly strong bond, since the withdrawal of magnesium ions shifts the equilibrium of the solution and increases the degree of supersaturation of chloride ions.
  • the process according to the invention is advantageously carried out in such a way that polycarboxylic acids are used in amounts of 0.5-10% by weight, preferably about 5% by weight, based on MgO, which results in particularly high final strengths and good breaking strength.
  • the temperature control is not critical during setting or hardening and it is possible to work at ambient temperature without regulating or controlling the temperature. In any case, however, the temperature should be controlled in such a way that the temperature is kept below 100 ° C., preferably below 60 ° C., during setting or hardening in order not to impair the final strength properties in this way. If the proportion of polycarboxylic acid is correspondingly high, it may be necessary to provide cooling in order to maintain these temperatures in order to reliably avoid local overheating during setting or hardening.
  • the process according to the invention is carried out in such a way that MgO and MgCl are used in a manner known per se in amounts of 25-35% by weight, MgCl2 preferably being used in an aqueous solution at 30 ° Be and the polycarboxylic acids in an aqueous solution with a solids content of 25-35% by weight, preferably 30% by weight.
  • MgO and MgCl are used in a manner known per se in amounts of 25-35% by weight, MgCl2 preferably being used in an aqueous solution at 30 ° Be and the polycarboxylic acids in an aqueous solution with a solids content of 25-35% by weight, preferably 30% by weight.
  • the mixture was poured into suitable molds immediately after the mixing, and a heat shade could be determined already during the pouring, which resulted from the setting reaction of the polycarboxylic acid with the magnesium ions and the Sorel cement bond.
  • the moldings were stored at room temperature and their properties were examined after 3 days. After 3 days, a test molded body had a compressive strength of 398 kg / cm2, a bending tensile strength of 93.8 kg / cm2 and a shrinkage of 0.17 to 0.19%.
  • the further batch of the shaped bodies prepared in this way was allowed to harden further and another shaped body was examined after 7 days.
  • the molded body had a compressive strength of 664 kp / cm2, a bending tensile strength of around 121.9 kp / cm2 and a shrinkage of 0.19%. Since these values were still too low compared to a conventional grinding wheel mixture, which was only produced on the basis of Sorel cement, the grinding wheel mixture was left unchanged for a further 3 weeks. After a total period For 4 weeks, the grinding wheels consistently had compressive strengths in the range from 775 to 785 kp / cm2, a bending tensile strength from 146 to 149 kp / cm2 and an average shrinkage of 0.16%.
  • a comparative grinding body which was only produced by mixing 2.4 kg of magnesium oxide, 2.4 kg of corundum and 2000 cm3 of a magnesium chloride solution of 30 ° Bé, had a compressive strength of 1000 kp / cm2 and a bending tensile strength of 140 kp / cm2 at the same time and the shrinkage was 0.14%.
  • the abrasive bodies cast in this way were again examined after 3 days, 7 days and 28 days.
  • the abrasives had a compressive strength of 405 kg / cm2, a bending tensile strength of 95.8 kg / cm2 and the shrinkage was 0.16%.
  • the compressive strength was 671 kp / cm2, the bending tensile strength was 124.6 kp / cm2 and the shrinkage was 0.17%.
  • the abrasives had a compressive strength of 780 to 791 kg / cm2, a bending tensile strength of 147 to 155 kg / cm2 and the shrinkage was 0.18%.
  • the abrasives After 7 days, the abrasives had a compressive strength of 659 kp / cm2 and a flexural tensile strength of 119.8 kp / cm2. The shrinkage was 0.16%. After 28 days, the coarse-grained abrasives showed a 0.16% shrinkage. The compressive strength of these grinding wheels was 770 kp / cm2 and the bending tensile strength was 145.9 kp / cm2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (6)

  1. Procédé de fabrication de corps abrasifs comprenant des abrasifs tels que, par exemple SiC, le corindon, Al₂O₃ ou B₄C, granulaires, enrobés dans un liant, dans lequel on utilise comme liant une résine synthétique, MgO et MgCl₂, caractérisé en ce qu 'on met en oeuvre comme résine synthétique des acides polycarboxyliques et en ce qu 'on amène les corps abrasifs moulés à prendre en masse ou à durcir sans apport additionnel de chaleur extérieure en faisant réagir les acides polycarboxyliques avec des ions Mg.
  2. Procédé selon la Revendication 1, caractérisé en ce qu 'on met les acides polycarboxyliques en oeuvre dans des proportions de 0,5 à 10 % en poids, de préférence d'environ 5 % en poids, rapportées au MgO.
  3. Procédé selon la Revendication 1 ou 2, caractérisé en ce que la température est maintenue au-dessous de 100°C, de préférence au-dessous de 60°C pendant la prise en masse ou le durcissement.
  4. Procédé selon la Revendication 1, 2 ou 3, caractérisé en ce qu 'on utilise MgO et MgCl d'une façon connue en soi, en proportions de 25 à 35 % en poids.
  5. Procédé selon une des Revendications 1 à 4, caractérisé en ce qu 'on utilise MgCl₂ en solution aqueuse à 30° Bé.
  6. Procédé selon une des Revendications 1 à 5, caractérisé en ce qu 'on utilise les acides polycarboxyliques en solution aqueuse avec une teneur en solides de 25 à 35 % en poids, de préférence de 30 % en poids.
EP90890016A 1989-01-30 1990-01-25 Procédé pour la fabrication de corps abrasifs Expired - Lifetime EP0381662B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT182/89 1989-01-30
AT182/89A AT392604B (de) 1989-01-30 1989-01-30 Verfahren zur herstellung von schleifkoerpern

Publications (3)

Publication Number Publication Date
EP0381662A2 EP0381662A2 (fr) 1990-08-08
EP0381662A3 EP0381662A3 (en) 1990-09-26
EP0381662B1 true EP0381662B1 (fr) 1993-06-16

Family

ID=3483675

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90890016A Expired - Lifetime EP0381662B1 (fr) 1989-01-30 1990-01-25 Procédé pour la fabrication de corps abrasifs

Country Status (4)

Country Link
EP (1) EP0381662B1 (fr)
AT (2) AT392604B (fr)
DE (1) DE59001733D1 (fr)
ES (1) ES2042270T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102699826A (zh) * 2012-06-16 2012-10-03 大连理工大学 一种常温固化结合剂软磨料砂轮

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE354120A (fr) *
DE317583C (fr) *
FR480929A (fr) * 1915-05-21 1916-10-10 Emile Eugene Albert Sorel Perfectionnement aux meules artificielles et particulièrement aux meules et agglomérés magnésiens
DE2401099A1 (de) * 1971-09-22 1975-07-17 Poli Schleifkoerper fuer die bearbeitung von harten steinen
DE2931652A1 (de) * 1979-08-03 1981-02-19 Meyer Carl Steinbearbeitungs M Polierkoerper und verfahren zu seiner herstellung
DE3013848A1 (de) * 1980-04-10 1981-10-15 Denticon Dental-GmbH, 7750 Konstanz Verfahren zum herstellen von schleif-, trenn-, separier- und polierscheiben, -spitzen o.dgl.
DE3301925A1 (de) * 1983-01-21 1984-07-26 SEA Schleifmittel Entwicklung Anwendung GmbH, 7530 Pforzheim Verfahren zur herstellung von schleifkoerpern
US4761163A (en) * 1987-09-14 1988-08-02 Ida Messere Method for making quick ageing abrasive slurries for the construction of grinding wheels, and the abrasive slurries made thereby

Also Published As

Publication number Publication date
AT392604B (de) 1991-05-10
EP0381662A2 (fr) 1990-08-08
ATA18289A (de) 1990-10-15
ATE90607T1 (de) 1993-07-15
ES2042270T3 (es) 1993-12-01
EP0381662A3 (en) 1990-09-26
DE59001733D1 (de) 1993-07-22

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