EP0348608B2 - Procédé pour dégager des cristaux de silicium - Google Patents

Procédé pour dégager des cristaux de silicium Download PDF

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Publication number
EP0348608B2
EP0348608B2 EP89105763A EP89105763A EP0348608B2 EP 0348608 B2 EP0348608 B2 EP 0348608B2 EP 89105763 A EP89105763 A EP 89105763A EP 89105763 A EP89105763 A EP 89105763A EP 0348608 B2 EP0348608 B2 EP 0348608B2
Authority
EP
European Patent Office
Prior art keywords
silicon crystals
diameter
tool
bristles
matrix
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
EP89105763A
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German (de)
English (en)
Other versions
EP0348608A1 (fr
EP0348608B1 (fr
Inventor
Gerhard Dipl.-Ing. Flores (Fh)
Thomas P. Dipl.-Ing. Wand
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.)
Kadia Produktion GmbH and Co
Original Assignee
Kadia Produktion GmbH and Co
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Filing date
Publication date
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Application filed by Kadia Produktion GmbH and Co filed Critical Kadia Produktion GmbH and Co
Publication of EP0348608A1 publication Critical patent/EP0348608A1/fr
Application granted granted Critical
Publication of EP0348608B1 publication Critical patent/EP0348608B1/fr
Publication of EP0348608B2 publication Critical patent/EP0348608B2/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
    • B24D13/10—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising assemblies of brushes
    • 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
    • B24B33/00—Honing machines or devices; Accessories therefor
    • B24B33/02—Honing machines or devices; Accessories therefor designed for working internal surfaces of revolution, e.g. of cylindrical or conical shapes

Definitions

  • the invention relates to a method for exposing Silicon crystals on the surfaces of finely machined, preferably honed workpieces in which the silicon crystals are embedded in a much softer matrix.
  • Such methods are e.g. used to the cylindrical piston raceways of the engine blocks from To edit motor vehicle engines.
  • By exposing it raised compared to the recessed aluminum matrix Silicon crystals form the wear-resistant surface which the pistons or piston rings run while that through the Resetting of the aluminum matrix released volumes between the silicon crystals to absorb lubricating oil serves.
  • a frequently used light metal material is the hypereutectic aluminum-silicon alloy Al Si 17 Cu 4 Mg. It is cast using the low pressure process and forms at Solidification of highly wear-resistant silicon crystals of a size 30-80 ⁇ m. Finishing is done by drilling and honing. The crystals are then exposed.
  • JP-A 62,173,164 said the exposure is performed by electrochemical or electroless chemical etching (ECM E lektro C hemical M achining).
  • ECM E lektro C hemical M achining electrochemical or electroless chemical etching
  • etching requires a high level of engineering support in series production, since satisfactory work results can only be achieved by carefully monitoring the process.
  • the asset value is extremely high.
  • the act time is up to four minutes. The processes are automated only with great effort.
  • the invention thus creates chemical etching a cutting process. Doing so you look at the very different localities in the material Hardening the silicon crystals on the one hand and the Aluminum matrix on the other hand, as well as the associated different machining properties of both materials advantage. Through the use of a brushing tool Area of the matrix, i.e. the softer material, material worn away. Due to the twenty times greater hardness of the Silicon crystals are processed Silicon crystals do not take place. This procedure is extraordinarily easy, because well-known honing machines are also included can be used. The cycle time drops to less than a minute.
  • Brushing is done with a relatively simple brushing tool without handling corrosive liquids.
  • Figure 1a shows the surface of a Silicon-aluminum alloy after fine machining, for example after honing, silicon crystals 1 being embedded in an aluminum matrix 2.
  • FIG. 1b shows the desired state in which the aluminum matrix 2 after processing has been set back by an amount h compared to the contact surface formed by the silicon crystals.
  • a surface can be, for example, cylindrical piston raceways in an engine block.
  • the brushing tool 3 shown in FIGS. 2 and 3 is suitable for this application.
  • the brush tool 3 has brush strips 4, which by a in cross-section T-shaped carrier 5 and a There are a large number of bristles 6 mounted thereon.
  • the vertical standing bars 7 of the T-shape of the cross section of the beams 5 have an axially parallel edge 7 'and an oblique to it running edge 7 ''.
  • the edges 7 'and 7' ' interact with an expansion body 8, the two conical Has areas 9, in each of which grooves 10 are provided are that receive the beams 7 of the carrier 5 and cause the oblique edges 7 'of the beam 7 on the bottom of the grooves 10 slide.
  • the radial expansion of the brush strips 4 takes place by axial displacement of the expansion body 8.
  • Die Brush strips 4 are radial by springs 11 and 12 Direction held together. They are from a cuff 13 surrounded on the front with a lid 14 is screwed and has slots 15 through which the ends of the bristles of the brush strips extend.
  • the Sleeve 13 encompasses a flange 16 of tool body 17 and is screwed to it.
  • the tool body is by means of Bolt 18 firmly connected to the sleeve 19.
  • In the tool body 17 is a disk 21 by means of a Seegerrring 20 arranged.
  • the expansion body 8 is fixed to the rod-shaped cylindrical extension 22 connected to the also carries a circlip 23.
  • a rotation of the threaded sleeve 28 on the thread 29 on the sleeve 19th causes an axial displacement of the pressure pin 25 and thus via extension 22, expansion body 8 and a radial Displacement of the brush strips 4.
  • a Clamping shaft 30 connected to the clamping in the rotary driven and according to a certain feed in Axially displaceable spindle of a machine unit serves.
  • FIG. 4 shows a greatly enlarged image of an individual bristle 6.
  • Cutting grains are embedded in a carrier material made of polyamide.
  • the cutting grains 31 can consist, for example, of diamond, corundum, silicon carbide, boron carbide or CBN (cubic drilling nitride).
  • the grain sizes range from 60 to 800 mesh.
  • the diameter of a single bristle should be designed so that it is not greater than the average distance between the silicon crystals on the surface to be processed.
  • Al Si 17 Cu 4 Mg there are, for example, about 14,000 silicon crystals with a grain size of 30 to 50 ⁇ m and about 3,100 crystals with a grain size of 40 to 80 ⁇ m on 1 cm 2 .
  • the resulting minimum crystal spacing on the surface is approximately 0.030 to 0.050 mm.
  • the bristle diameter should therefore be chosen correspondingly smaller, but depends on the distance between the crystals. It is important that the bristles reach the areas of the matrix between the silicon crystals directly and can remove material there.
  • the lubricant necessary, also for it Fat content, which is the friction between the bristle ends and the Matrix and thus the cutting behavior of the bristles Cutting grains determined on the bristles.
  • Fat content which is the friction between the bristle ends and the Matrix and thus the cutting behavior of the bristles Cutting grains determined on the bristles.
  • the friction of the cutting grain and material can be set so that exactly the required Material removal from 1 to 1.5 ⁇ m in the area of the matrix 2 results.
  • the tool is only in the Drilled hole, the inner surface of which is to be brushed. When a constant expansion dimension is reached, the Rotary motion on. To expand the tool, Use of a tool according to FIGS. 2 and 3 - one Defined adjustment of the threaded sleeve 28 in the Series production - as described - using a stepper motor driven delivery system is replaced. It definitely has to be sure that the tool is on every cycle is expanded to the same expansion diameter and thus works with constant bristle pretension. To one Wear on the bristles and fill material compensate, is used in series production empirically the number of pieces to be determined, the tool by a certain amount, that corresponds to the wear, expanded more. This is done when using step control additional delivery impulses.
  • the bristle pretension expediently between 0.5 and 2 mm in diameter is, i.e. that the bristles have a diameter of Bristle end to be expanded to the bristle end without Concern about a hole is larger by the amount mentioned than the diameter of the hole.
  • 5 shows the functional diagram for the machining process.
  • 5 (a) the axial position 1 of the tool is plotted against time t. 1 H is the stroke length. Point a denotes the upper end position.
  • 5 (b) shows the infeed movement dr as a function of time. From this it can be seen that the expansion of the tool takes place after the retraction and that the brush strips are retracted again in the radial direction before the extension of the tool.
  • 5 (c) shows the course of the rotary movement n over time. It can be seen from a comparison with FIGS. 5 (a) and 5 (b) that the rotary movement only begins after the tool has been retracted and expanded. The direction of rotation is reversed after half the machining time so that the silicon crystals are cut from both sides. It is preferably carried out at a peripheral speed of 250 to 450 m / min and with an axial feed of 5 to 15 m / min.
  • the processing time can be 10 to 40 seconds. That gives 10 to 20 double strokes
  • Figure 6 shows a photograph of a processed Surface. You can clearly see how that Silicon-crystalline 1 protrude from the aluminum matrix 2, so that the desired picture results. These are around a scanning electron microscope image of a honed one Surface of a light alloy engine block. The uniform Cutting level at which the aluminum matrix and the flat silicon crystal is clearly recognizable. Different roughnesses are also visible due to the partial hardness differences between the two Materials - silicon and aluminum - result.

Landscapes

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

Claims (3)

  1. Procédé pour dégager des cristaux de silicium sur des surfaces de pièces ayant subi un usinage de finition, de préférence rodés, dans lesquelles lesdits cristaux de silicium (1) ont une grosseur de grain minimal de 30 à 80 µ et une distance minimale de 30 à 50 µ et sont noyés dans une matrice (2) en aluminium dont la dureté est considerablement moindre, et dans lesquelles le volume devenant dégagé de 1 à 2 µ par le repositionement de la matrice sert à recevoir de l'huile de graissage, caracterisé en ce qu'à la suite de l'usinage de finition la surface de la pièce est traitée par brossage avec des poils (6) de brosserie ayant des grains (31) de coupe deposés dans leurs surfaces, le diamétre des poils des brosses utilisées étant déterminé tel qu'il ne dépasse pas la distance moyenne entre les cristaux de silicium.
  2. Procédé selon revendication 1, caractérisé en ce que, lors du brossage de surfaces internes de perçage, le diamètre de la brosse (4, 6) utilisée pour la mise en oeuvre du procédé est supérieur de 0,5 à 2 mm à celui du perçage.
  3. Procédé selon les revendications 1 ou 2, caractérisé en ce que le sens de rotation de l'outil de brossage (3) est inversé après écoulement de la moitié du temps requis pour l'usinage.
EP89105763A 1988-06-30 1989-04-01 Procédé pour dégager des cristaux de silicium Expired - Lifetime EP0348608B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3822169 1988-06-30
DE3822169A DE3822169A1 (de) 1988-06-30 1988-06-30 Verfahren zum freilegen von silizium-kristallen

Publications (3)

Publication Number Publication Date
EP0348608A1 EP0348608A1 (fr) 1990-01-03
EP0348608B1 EP0348608B1 (fr) 1992-09-16
EP0348608B2 true EP0348608B2 (fr) 2000-10-04

Family

ID=6357669

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89105763A Expired - Lifetime EP0348608B2 (fr) 1988-06-30 1989-04-01 Procédé pour dégager des cristaux de silicium

Country Status (2)

Country Link
EP (1) EP0348608B2 (fr)
DE (2) DE3822169A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9215134U1 (de) * 1992-11-06 1992-12-24 Braun, Manfred, Dipl.-Ing., 7303 Neuhausen Honahle
DE19627926A1 (de) * 1996-07-11 1998-01-15 Ks Aluminium Technologie Ag Verfahren zur Bearbeitung von Zylinderlaufflächen
DE19956306B4 (de) * 1999-11-20 2010-02-11 Volkswagen Ag Verfahren zum Bearbeiten von Oberflächen, insbesondere von Zylinderlaufflächen an Brennkraftmaschinen
DE10119337C1 (de) * 2001-04-20 2003-02-06 Daimler Chrysler Ag Verfahren und Einrichtung zur Herstellung tribologischer Flächen
DE10163970B4 (de) * 2001-12-20 2011-01-20 Elgan-Diamantwerkzeuge Gmbh & Co. Kg Verschleißarme Werkstückfläche und Verfahren zu ihrer Herstellung
DE102007028294B4 (de) * 2007-06-06 2010-03-04 Daimler Ag Vorrichtung und Verfahren zum Freilegen von in einer Aluminium-Matrix eingebetteten Silizium-Kristallen an einer Oberfläche eines Werkstücks
DE102007032915B4 (de) 2007-07-14 2021-11-25 Bayerische Motoren Werke Aktiengesellschaft Verfahren zum Herstellen einer Brennkraftmaschine und nach diesem Verfahren hergestellte Brennkraftmaschine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1521939B1 (de) † 1964-06-29 1970-10-22 Reynolds Metals Co Verfahren zur Herstellung feingeschlichteter Oberflächen niedriger Reibung von K¦rpern aus Legierungen auf Aluminiumbasis mit hohemSiliziumgehalt
JPS62173164A (ja) † 1986-01-24 1987-07-30 Toyota Motor Corp アルミシリンダブロツクのボア加工方法
DE3618315C1 (de) † 1986-05-30 1988-01-21 Kadia Maschb Kopp Gmbh & Co Verfahren und Werkzeug zur Bearbeitung der Oberflaechen von Werkstuecken

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1903269A1 (de) * 1969-01-23 1970-07-30 Daimler Benz Ag Verfahren zur Verbesserung der Innenflaeche von zylindrischen Werkstuecken mittels Honen
US3871139A (en) * 1974-05-10 1975-03-18 Rands Steve Albert Multiple-compliant-bristle, self-centering self-sizing rotary abrasive hone
DE2518435A1 (de) * 1975-04-25 1976-11-04 Schmidt Gmbh Karl Verfahren zur feinbearbeitung metallischer werkstueckoberflaechen
DE2846238C2 (de) * 1978-10-24 1983-01-13 Siegfried 7291 Loßburg Silzle Zusatzeinrichtung zum Bürsten ebener Werkstücke mit Naturholzoberfläche
DE3737636A1 (de) * 1987-11-06 1989-05-18 Wesero Maschinenbau Gmbh Einrichtung zum buersten von plattenfoermigen werkstuecken

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1521939B1 (de) † 1964-06-29 1970-10-22 Reynolds Metals Co Verfahren zur Herstellung feingeschlichteter Oberflächen niedriger Reibung von K¦rpern aus Legierungen auf Aluminiumbasis mit hohemSiliziumgehalt
JPS62173164A (ja) † 1986-01-24 1987-07-30 Toyota Motor Corp アルミシリンダブロツクのボア加工方法
DE3618315C1 (de) † 1986-05-30 1988-01-21 Kadia Maschb Kopp Gmbh & Co Verfahren und Werkzeug zur Bearbeitung der Oberflaechen von Werkstuecken

Also Published As

Publication number Publication date
EP0348608A1 (fr) 1990-01-03
EP0348608B1 (fr) 1992-09-16
DE3822169C2 (fr) 1993-02-04
DE58902276D1 (de) 1992-10-22
DE3822169A1 (de) 1990-01-04

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