WO1995021727A1 - Procede pour l'abrasion et le polissage d'objets - Google Patents

Procede pour l'abrasion et le polissage d'objets Download PDF

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Publication number
WO1995021727A1
WO1995021727A1 PCT/EP1994/004237 EP9404237W WO9521727A1 WO 1995021727 A1 WO1995021727 A1 WO 1995021727A1 EP 9404237 W EP9404237 W EP 9404237W WO 9521727 A1 WO9521727 A1 WO 9521727A1
Authority
WO
WIPO (PCT)
Prior art keywords
objects
polishing
grinding
dry
coconut
Prior art date
Application number
PCT/EP1994/004237
Other languages
German (de)
English (en)
Inventor
Manfrid Dreher
Original Assignee
Dr.-Ing. Manfrid Dreher Gmbh & 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 Dr.-Ing. Manfrid Dreher Gmbh & Co. Kg filed Critical Dr.-Ing. Manfrid Dreher Gmbh & Co. Kg
Publication of WO1995021727A1 publication Critical patent/WO1995021727A1/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
    • B24B31/00—Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor
    • B24B31/12—Accessories; Protective equipment or safety devices; Installations for exhaustion of dust or for sound absorption specially adapted for machines covered by group B24B31/00
    • B24B31/14—Abrading-bodies specially designed for tumbling apparatus, e.g. abrading-balls

Definitions

  • the invention relates to a method for grinding and polishing objects in rotating centrifugal vibratory grinding devices using granular grinding and polishing agents, the objects being ground in a first step and dry-polished in a subsequent second step.
  • a disadvantage of the previous combined wet and dry The key process is the long processing time of, for example, 24 hours, the cumbersome handling during the multiple transition from one stage to the next, and the rinsing and separation associated therewith, and the considerable amount of treatment agents involved. It is also a particular disadvantage that during the actual grinding, which is carried out using the wet process, considerable amounts of waste water are obtained which have to be treated.
  • the object is achieved in the generic method by the invention in that, in the first step, the articles are used exclusively using an abrasive which contains coconut and / or Brazil nut shell granulate and pumice powder, silicon carbide, tungsten carbide and / or boron carbide powder grinds dry.
  • an abrasive which contains coconut and / or Brazil nut shell granulate and pumice powder, silicon carbide, tungsten carbide and / or boron carbide powder grinds dry.
  • the finish grinding treatment is therefore carried out only in two stages, namely by an exclusively dry treatment, namely dry grinding and dry polishing.
  • an exclusively dry treatment namely dry grinding and dry polishing.
  • This not only saves about 50% of the processing time, but also makes handling easier overall by reducing it to two process steps, the process means also being considerably reduced.
  • the elimination of wastewater treatment is particularly advantageous.
  • the method according to the invention is preferably carried out in two different types of rotating centrifugal vibratory grinding devices, the centrifugal force having the effect being at least 5 g.
  • the first type of device comprises the so-called “planetary devices”, in which drums, which receive the objects to be treated and the treatment agents, rotate in a known manner both about their own axis and about the axis of a turntable.
  • the second type of device comprises the so-called “turbo devices”, in which a turntable rotates in the bottom area of a stationary drum, which rotates the mass consisting of the treatment agents and the objects to be treated in a rotating circulating movement.
  • the drawing shows, for example, a turbo device 1 with two drums 2, 3, which are arranged on a machine frame 4.
  • Each drum 2, 3 comprises in its bottom region, in a manner known per se, a rotatably driven plate (not visible in the drawing).
  • the drive is carried out in each case by drive motors with gears housed in the machine frame 4 (not visible in the drawing).
  • One in the middle between the Drums 2, 3 formed on the machine frame 4 with a lower working surface 5 receive a vessel 6, which is usually covered by a sieve (not shown).
  • the drums 2, 3 can be uncoupled from the associated drive motors by lifting and then shifted laterally on a rail 7 towards the center of the machine frame 4.
  • the drum in question is tilted towards the container 6 so that its contents can be emptied into the container 6.
  • the sieve covering the container 6 retains the treated articles while the treatment agents fall through the sieve into the container 6.
  • the emptied drum is then returned to its working position and filled again with the material and treatment agent to be treated.
  • the left drum 2 is used for grinding and the right drum 3 for polishing the objects, which are preferably metallic objects, for example made of noble metal, but also of other materials, for example stone, gemstone, plastic can.
  • Cisive for the effectiveness and the success of the method according to the invention is the use of a special abrasive during the dry grinding process in the drum 2, namely the use of a coconut or Brazil nut shell granulate, combined with conventional grinding minerals, for example pumice stone powder, if necessary mixed with silicon carbide, tungsten carbide and / or boron carbide powder.
  • the coconut or Brazil nut shell granulate can have an average grain diameter of 0.5 to 5 mm, preferably 2 to 5 mm.
  • this granulate is on the one hand extremely hard, but on the other hand has such a structure that it absorbs mineral abrasives, for example by impregnation, in the required amount and uniformly and during the grinding process on the surfaces of the objects to be treated Brings effect.
  • This is the basis for the extraordinary success of the invention, which consists above all in the elimination of wet treatment, since the described treatment with coconut or Brazil nut shell granulate completely replaces the two wet stages of the known method and also eliminates subsequent smoothing. Mixtures of coconut and Brazil nut shell granules also lead to excellent results.
  • the drum 2 of the centrifugal slide grinding device shown When the grinding process with coconut or Brazil nut shell granules in the drum 2 of the centrifugal slide grinding device shown is completed after, for example, about four hours, the drum 2 is emptied in the manner described. After the abrasive has been separated off, the ground objects are transferred to the drum 3 and dry-polished there using a conventional polishing agent, for example aluminum oxide.
  • the polishing time can e.g. about three hours.
  • objects made of 14-carat gold casting alloy were treated in a centrifugal slide grinding device, as shown in the drawing.
  • the grinding process took four hours and the polishing process three hours.
  • a coconut shell granulate with an average grain diameter of about 3.5 mm was used for grinding, which was impregnated and mixed with pumice stone powder.
  • Conventional aluminum oxide was used as the polishing agent.
  • the average roughness number was 0.25 and the maximum roughness number was 0.55. Repeating the experiment with Brazil nut shell granulate (average grain diameter 2 mm) gave the same results.
  • a mixture of walnut shell meal, pumice stone and water was used as the abrasive and aluminum oxide as the polishing agent.
  • the total treatment time was 18 hours.
  • the roughness values achieved were somewhat worse than the values mentioned above which were achieved by using the method according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

Un procédé pour l'abrasion et le polissage d'objets dans des machines d'abrasion à force centrifuge, rotatives, au moyen de produits abrasifs et de polissage granulaires, comprend une première phase dans laquelle les objets sont abrasés à sec au moyen d'un produit abrasif contenant des granulés de coquille de noix de coco ou de noix du Brésil et les minerais usuels. Dans une seconde phase, les objets abrasés sont polis au moyen d'un produit de polissage usuel.
PCT/EP1994/004237 1994-02-09 1994-12-20 Procede pour l'abrasion et le polissage d'objets WO1995021727A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19944404123 DE4404123C1 (de) 1994-02-09 1994-02-09 Verfahren zum Trockenschleifen und anschließenden Trockenpolieren von Gegenständen in rotierenden Fliehkraft-Gleitschleifmaschinen
DEP4404123.3 1994-02-09

Publications (1)

Publication Number Publication Date
WO1995021727A1 true WO1995021727A1 (fr) 1995-08-17

Family

ID=6509887

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1994/004237 WO1995021727A1 (fr) 1994-02-09 1994-12-20 Procede pour l'abrasion et le polissage d'objets

Country Status (2)

Country Link
DE (1) DE4404123C1 (fr)
WO (1) WO1995021727A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU706377B2 (en) * 1996-11-27 1999-06-17 Bbf Yamate Corporation Barrel polishing apparatus
DE20009539U1 (de) * 2000-05-26 2001-08-02 Otec Praezisionsfinish Gmbh Vorrichtung zum Schleifen von Schleifgut
DE102010037077B4 (de) 2010-08-19 2014-03-13 Voestalpine Stahl Gmbh Verfahren zum Konditionieren der Oberfläche gehärteter korrosionsgeschützter Bauteile aus Stahlblech

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS597555A (ja) * 1982-07-01 1984-01-14 Mashintsuule Chuo:Kk 歯科修復物の研磨方法
JPS6048251A (ja) * 1983-08-24 1985-03-15 Tipton Mfg Corp 乾式バレル研磨法
US5279074A (en) * 1990-08-28 1994-01-18 The Grav-I-Flo Corporation Centrifugal disk finishing apparatus utilizing dry media

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2185262A (en) * 1938-04-09 1940-01-02 Jr Joseph Lupo Compound for and process of surface finishing metallic articles

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS597555A (ja) * 1982-07-01 1984-01-14 Mashintsuule Chuo:Kk 歯科修復物の研磨方法
JPS6048251A (ja) * 1983-08-24 1985-03-15 Tipton Mfg Corp 乾式バレル研磨法
US5279074A (en) * 1990-08-28 1994-01-18 The Grav-I-Flo Corporation Centrifugal disk finishing apparatus utilizing dry media

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 008, no. 090 (M - 292) 25 April 1984 (1984-04-25) *
PATENT ABSTRACTS OF JAPAN vol. 009, no. 179 (M - 399) 24 July 1985 (1985-07-24) *

Also Published As

Publication number Publication date
DE4404123C1 (de) 1995-09-07

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