EP0209004A1 - Machine vibrante pour le traitement de surface des objets en vrac - Google Patents

Machine vibrante pour le traitement de surface des objets en vrac Download PDF

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Publication number
EP0209004A1
EP0209004A1 EP86109065A EP86109065A EP0209004A1 EP 0209004 A1 EP0209004 A1 EP 0209004A1 EP 86109065 A EP86109065 A EP 86109065A EP 86109065 A EP86109065 A EP 86109065A EP 0209004 A1 EP0209004 A1 EP 0209004A1
Authority
EP
European Patent Office
Prior art keywords
lapping
conveyor
lapping device
treatment room
sfl
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.)
Granted
Application number
EP86109065A
Other languages
German (de)
English (en)
Other versions
EP0209004B1 (fr
Inventor
Siegfried Dr. Birkle
Johann Gehring
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Priority to AT86109065T priority Critical patent/ATE43084T1/de
Publication of EP0209004A1 publication Critical patent/EP0209004A1/fr
Application granted granted Critical
Publication of EP0209004B1 publication Critical patent/EP0209004B1/fr
Expired legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • 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
    • B24B31/06—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 involving oscillating or vibrating containers
    • B24B31/073—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 involving oscillating or vibrating containers involving a bowl being ring- or spiral-shaped

Definitions

  • the invention relates to a lapping device for improving the surface of pourable material, in particular for pretreatment for the electrodeposition of aluminum from aprotic, oxygen and water-free, organoaluminum electrolytes, with a treatment room in which a relative movement can be generated between the pourable material and a lapping agent.
  • lapping is to be understood in the following to mean a machining process with loose grain, the lapping agent, which is distributed in a paste or liquid.
  • grinding is a cutting machining process with multi-edged tools of geometrically undefined cutting edge shape, which consist of a large number of bound grains.
  • a lapping device for improving the surface of pourable material in which a mass consisting of the material and abrasives is introduced into a circular vibration tube and is compressed there by the decreasing cross-section of the vibration tube.
  • the filling opening of the vibration tube is closed during operation, this closing only serving the purpose of being able to process a much larger quantity than in the case of an open vibration tube.
  • the size of the lapping device is limited, however, since the vibration tube, together with the material contained therein and the abrasive, must be set in vibration.
  • the throughput that can be achieved is correspondingly low.
  • the known lapping devices are used, in particular, in electroplating technology to generally improve the surface condition of workpieces with the aim of ensuring that galvanic precipitates adhere well during subsequent electroplating.
  • the surface improvement to be carried out can include edge rounding, smoothing, glossing, polishing, degreasing and descaling.
  • Further areas of application of the known lapping devices are surface improvements for subsequent metallization in a vacuum, for applying layers of lacquer and for other methods of coating workpieces with mostly very thin, protective and beautifying coatings on less valuable substrates.
  • Aluminum deposited from aprotic, oxygen and water-free, organoaluminum electrolytes is characterized by its ductility, low pore density, corrosion resistance and anodizing ability. Since the entry of air through reaction with atmospheric oxygen and air humidity causes a considerable reduction in the conductivity and the service life of these electrolytes, the electroplating must be carried out in an air-tight treatment facility. So that even when loading and unloading these air-operated treatment facilities, the access of air ver can be prevented, import and export locks are also required, which are designed as gas locks, as liquid locks or as combined gas-liquid locks and are equipped with means of conveyance to pass the electroplated material.
  • import and export locks are also required, which are designed as gas locks, as liquid locks or as combined gas-liquid locks and are equipped with means of conveyance to pass the electroplated material.
  • Such an aluminizing device, working in the absence of air and provided with import and export locks, for the mass electroplating of pourable goods is known, for example, from EP-OS 0 070 01
  • the aluminizing using aprotic, aluminum-organic electrolytes requires a particularly careful pretreatment and surface improvement of the aluminizing material.
  • the pretreatment in a lapping device and the introduction of the electroplating material into the aluminizing device there must be no surface reactions impairing the adhesive strength of the aluminum layers, while on the other hand the introduction of atmospheric oxygen, air humidity and other substances that are harmful to the sensitive electrolyte must be prevented with the aluminizing material.
  • electroplated material made of materials such as iron, steel, titanium and the like with adhesive galvanic aluminum coatings in a lapping device immediately after the pretreatment. In order to obtain well-adhering aluminum coatings, an electrodeposited nickel intermediate layer had to be applied beforehand.
  • the invention has for its object to provide a lapping device for improving the surface of pourable goods, in which the general improvement of the surface condition of the goods can be maintained until a subsequent coating.
  • Both solutions are based on the common idea that lapping can be carried out in a gas-tight, lockable, inert gas-treated treatment room, provided that an oscillating conveyor is used as a means of transport for the then necessary transport of the bulk material through the treatment room.
  • the vibratory conveyor can then transport the pourable material through a lapping agent bath contained in the treatment room, ie the relative movement required for the lapping process between the pourable material and the lapping agent is generated in a similar manner to the known lapping devices designed as vibrators.
  • the lapping can also be carried out in the manner of jet lapping, the jets emerging from the lapping agent nozzles being directed onto the pourable material which is moved past on the conveyor track of the vibratory conveyor.
  • the material processed with the exclusion of air by dipping lapping or jet lapping can then - without coming into contact with air - be introduced directly or via an import lock into a downstream coating device. In this way, reactions affecting the surface improvement - such as oxidation, corrosion and the like - can be ruled out until the subsequent coating process.
  • the lapping devices according to the invention are therefore also particularly suitable for the pretreatment for the electrodeposition of aluminum from aprotic, oxygen and water-free, organoaluminum electrolytes.
  • the vibratory conveyors used in the lapping devices according to the invention are conveying means which transport bulk material using the mass forces on a defined conveying path in a horizontal and / or inclined direction.
  • oblique vibrators or inclined handlebars serve to drive the conveyor track in such a way that the material mostly carries out micro-throwing movements and, if necessary, it is transported in the direction of conveyance at a profit.
  • a vibratory conveyor used in the devices according to the invention preferably has an upward conveying path. With regard to the smallest possible space requirement with a relatively long length of the conveyor track and thus the processing section, it is then particularly advantageous sticky if the conveyor track is helically upwards.
  • a so-called vibratory bowl feeder is used to convey the goods through the treatment room, the use of which has already proven itself when feeding and arranging small parts in handling technology (VDI-Z 123, 1981, No. 3-Febr.I, pages 82-86 ).
  • the conveyor track of the vibratory conveyor is preferably designed as a vibrating trough, which ensures safe guidance of the goods to be transported through the treatment room with little effort.
  • the conveyor path of the vibratory conveyor is preferably led beyond the level of the lapping agent bath. Above the bath level, lapping agent still adhering to the material is then thrown away by the vibrations, this effect being further promoted if the conveyor track is provided with perforations at least in the area which extends beyond the level of the lapping agent bath.
  • Carrying the lapping agent out of the treatment room can be completely ruled out if a spray device for spraying a liquid cleaning agent is arranged above the level of the lapping agent bath.
  • a solvent contained in the lapping agent bath is preferably fed to the spray device as a cleaning agent. In order to keep the composition of the lapping agent bath as constant as possible, this solvent is obtained from the lapping agent bath either with the aid of at least one filter or with the aid of a distillation device.
  • the supply of the pourable material to the lapping device is particularly easy to implement if the vibratory conveyor - seen in the conveying direction - is a gravity conveyor is connected upstream.
  • a gravity conveyor is arranged downstream of the vibratory conveyor - seen in the direction of conveyance.
  • the gravity conveyor is formed by a downpipe.
  • downpipes of this type can also be connected particularly easily to corresponding import or export locks.
  • the downpipe can then already be used as a downward leg of a U-shaped liquid lock.
  • vibratory conveyors can also be used, which ensure gentle handling of the goods and do not pose any problems with regard to the sealing of the lock chambers.
  • the pourable material can be returned to the initial region of the vibratory conveyor by a return device which can optionally be connected to the end of the vibratory conveyor.
  • the lapping can be done in two or more passes, i.e. the lapping time can be increased as required without extending the conveyor track.
  • the goods are not discharged until the desired surface condition has been reached.
  • the changeover between circulation and discharge is particularly easy to accomplish if the return device can be connected to the end of the vibratory conveyor via a switch.
  • the return device is designed as a gravity conveyor, then additional funds for the return can be dispensed with.
  • the gravity conveyor is again expediently formed by a downpipe, which also further improves its mixing when the material is treated gently.
  • An additional mixing of the material with a particularly uniform surface treatment from all sides can also be achieved in that the conveyor track of the vibratory conveyor - seen in the conveying direction - has at least one step leading downwards.
  • the upward conveying path of the vibratory conveyor is preferably attached to a centrally arranged support column.
  • Such support columns then perform the task of a space-saving supporting structure for the conveyor track in addition to the vibration transmission.
  • the vibration generation is then effected with little effort in that the support column is arranged on a vibrator.
  • the support column it is also possible for the support column to be arranged on a support plate which is mounted so as to vibrate in the treatment room and to carry a vibrator.
  • the inclusion of the entire vibration excitation in the treatment room eliminates the problem of sealing vibrating drive means guided to the outside.
  • Fig.l shows in longitudinal section a first embodiment of a tower-shaped lapping device for improving the surface of pourable material G, which is, for example, bolts, nuts, screws, spacers and the like.
  • the treatment of the pourable material G serves as pretreatment for the subsequent electrodeposition of aluminum from an aprotic, oxygen and water-free, organoaluminum electrolyte.
  • a lapping agent bath Lbl is located in a circular cylindrical treatment room Brl arranged on a frame Ge and sealed gas-tight with the aid of an upper cover Del, which is in an aprotic solvent such as e.g. Toluene, suspended lapping grain, e.g. Silicon carbide, aluminum oxide and the like.
  • an aprotic solvent such as e.g. Toluene, suspended lapping grain, e.g. Silicon carbide, aluminum oxide and the like.
  • the area of the treatment room Brl above the level Spl of the lapping agent bath Lbl is treated with an inert gas, such as e.g. Nitrogen, applied, the supply of this inert gas is indicated by an arrow Ig.
  • the material G to be processed is introduced from above into the lower region of the treatment room Brl via an inlet lock (not shown in more detail) and a downpipe FrlO, the downpipe Fr10 being filled with the lapping agent bath Lbl up to the level of the spl and above which inert gas Ig is applied .
  • the material G introduced via the downpipe Fr10 then falls on the lower end of the conveyor track Fbl of an arranged within the treatment room Brl and overall with vibratory conveyor designated Sfl.
  • the material G On the conveyor track Fbl, which is designed as a vibrating trough and spirally upwards, the material G is transported upward above the mirror Spl of the lapping agent bath Lbl and then falls into the funnel-shaped upper end of a downpipe Frl leading out of the treatment room Brl, which is like a Down pipe branches into a downpipe Frll and a downpipe Fr12. In the position shown in FIG. 1 of a switch Wel arranged at the branching point, the material G is then returned to the lowest passage of the helical conveyor track Fbl via the downpipe Frl2 re-entering the treatment room Brl.
  • the switch Wel designed as a pivotable flap, is changed over in the direction of the arrow Pf, the material G passes directly via the downpipe Frll or via a lock into a subsequently arranged aluminizing device which works with the exclusion of air.
  • the conveying path Fbl leading upward in the treatment room Brl is fastened to a centrally arranged support column Tsl, the lower end of which is fastened to a vibrator Vl arranged centrally within the frame Ge.
  • the passage of the support column Tsl through the floor of the treatment room Brl is sealed by an elastic and wear-resistant bellows Bl, which is connected on the one hand to a disc placed on the support column Tsl and on the other hand to the floor of the treatment room Brl.
  • the conveyor track Fbl is excited by the vibrator V1 via the support column Tsl to vibrate with an approximately helical movement.
  • the support column Tsl is firmly connected via a flange Fla to a support body Tk of the vibrator Vl which is flared downwards.
  • the supporting body Tk is mounted on the foundation so that it can vibrate via several springs Fdl.
  • An unbalance drive Ua is arranged within the conical support body Tk, the motor M of which drives flywheels Ss arranged on both sides with adjustable eccentricity e.
  • the drive axis Aa of the motor M is inclined at an angle of, for example, 45 ° to the horizontal, so that the unbalance of the flywheels Ss generates the vibrations already mentioned with an approximately helical movement.
  • the pourable material G is transported via the conveyor track Fbl through the lapping agent bath Lbl and its surface quality is improved by the relative movement between the goods G and the lapping grain contained in the lapping agent bath Lbl.
  • the lapping device is operated in the position of the switch Wel shown in Fig.l until the desired surface improvement has occurred. Thereafter, the material G conveyed beyond the mirror Spl of the lapping agent bath Lbl is removed with the aid of a in the treatment room Brl. arranged spray device Sel freed from the still adhering lapping agent and introduced into the downstream aluminizing device via the switch Wel which has been switched in the direction of the arrow Pf and the downpipe Frll.
  • the spraying device Sel sprays a liquid cleaning agent Rm, the extraction of which from the lapping agent bath Lbl will be explained in more detail later with reference to FIGS. 4 and 5. Since the entire lapping process is un ter takes place in an inert gas atmosphere and under completely aprotic conditions and the good G does not come into contact with air even when it is introduced into the downstream aluminizing device, the surface improvement achieved is retained until the aluminum is separated. For this reason, even material G consisting of iron, steel, titanium and the like can be directly galvanically coated with aluminum without the previously required application of an intermediate layer made of nickel.
  • the conveyor track Fbl and the support column Tsl should consist of abrasion-resistant materials at least in the areas that come into contact with the bath, or with abrasion-resistant coatings, e.g. Hard metal.
  • the lapping agent bath Lbl housed in the treatment room Brl has to be renewed from time to time or also removed from the abrasion in a continuous preparation process and provided with new lapping grain.
  • the supply and removal of the liquid lapping agent is indicated in Fig.l by corresponding arrows Zu and Ab.
  • FIG. 2 shows in longitudinal section a second embodiment of a tower-shaped lapping device for the surface treatment of pourable material G.
  • the aprotic lapping agent bath designated here with Lb2 is located in a circular cylindrical treatment room Br2 which is arranged directly on the corridor and is sealed gas-tight with the aid of an upper lid De2.
  • the area of the treatment room Br2 above the mirror Sp2 of the lapping agent bath Lb2 is charged with an inert gas, the supply of which is indicated by an arrow Ig.
  • the material G to be treated is introduced into the treatment room Br2 via a downpipe Fr20 and then falls onto the lower end of the conveyor track Fb2 of an oscillating conveyor arranged within the treatment room Br2 and generally designated Sf2.
  • the conveyor track Fb2 which is designed as a vibrating trough and spirally leads upwards, the material G is transported upward by the lapping means Lb2 and then falls onto a switch We2 designed as a short trough.
  • the material G passes several downstairs St of the conveyor track Fb2, the height of which is dimensioned such that the material G rotates when falling and an improved mixing of the material G is achieved.
  • the switch We2 shown in FIG.
  • the goods G arrive in a downpipe Fr22 serving as a return device, which leads the goods G back to the lowest aisle of the conveyor track Fb2.
  • the switch We2 With the position of the switch We2 shown, the goods G are thus circulated through the lapping agent bath Lb2.
  • the material G is cleaned with the aid of a spray device Se2 and discharged via a downpipe Fr21 when the switch We2 is switched over.
  • the upper opening of this downpipe Fr21 can be closed by a cover D, and the opening and closing of this cover D can be carried out pneumatically or hydraulically via an actuating rod Bs which is guided outwards.
  • the switch We2 is articulated to the actuating rod Bs via a coupling member Kg in such a way that a change occurs with the opening stroke of the cover D and the material G reaches a downstream aluminizing device via the downpipe Fr21.
  • the helical conveyor track Fb2 is fastened to a centrally arranged support column Ts2, the lower end of which can vibrate via a support plate Tp and several springs Fd2 is mounted on the floor of the treatment room Br2 and the upper part of which carries a vibrator V2 in the area above the mirror Sp2 of the lapping agent bath Lb2.
  • the vibrator VI which is not shown in terms of its function, can be rotated via a pin Z in the cover De2 and can also be centered and raised to a small extent.
  • FIG. 2 also shows a variant according to which the lapping in the treatment room Br2 is carried out solely by jet lapping or by a combination of jet lapping and plunge lapping.
  • a plurality of lapping agent nozzles Ld are directed onto the conveyor track Fb2, to which a liquid lapping agent Lm is supplied under pressure.
  • the lapping agent nozzles Ld can be arranged along the entire length of the conveying path in a helical course parallel to the conveying path Fb2, the lapping agent bath Lb2 then only serving as a sump for the lapping agent, the supply and removal of which is indicated by arrows Lm.
  • this jet lapping device shown as a variant functions like other such devices, but the liquid lapping agent Lm is not conveyed to the lapping agent nozzles Ld with the aid of a pressurized inert gas, such as nitrogen, for example.
  • FIG. 3 shows that the conveyor track Fb2 used in the lapping device according to FIG. 1 and fastened to the support column Tsl can be provided with a perforation P.
  • this perforation P brings about an improved access of the lapping agent to the material G, while in the area above it, the lapping agent still adhering to the material G is flung away and the Cleaning of the goods G can be favored with the help of the spray device Sel.
  • FIG. 4 shows, using the example of the lapping device shown in FIG. 2, a first principle for obtaining the cleaning agent Rm required for the operation of the spraying device Se2 from the lapping agent bath Lb2.
  • the lapping agent contained in the lapping agent bath Lb2 is drawn off via a pump P1 and then freed from the solid components in a coarse filter Gf and a fine filter Ff arranged downstream of it, so that the aprotic solvent contained in the lapping agent bath Lb2 can be supplied as a cleaning agent Rm to the spraying device Se2.
  • Arrows Pfl and Pf2 indicate that the solid components retained in the coarse filter Gf and the fine filter Ff, which are lapping grain and abrasion, can either be subjected to a treatment or can also be returned directly to the treatment room Br2.
  • the lapping agent contained in the lapping agent bath Lb2 is drawn off with the aid of a pump and fed to a distillation device designated overall by De.
  • the distillation device De comprises a first container Bhl in which the lapping agent bath Lb2 is heated with the aid of a heating device He such that the aprotic solvent contained therein evaporates.
  • the evaporated solvent is then condensed with the aid of a cooling device Ke, collected in a second container Bh2 and fed to the spray device Se2 as a liquid cleaning agent Rm via a pump P3.
  • the second container Bh2 is connected to the first container Bhl via a return pipe R1 serving as an overflow.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP86109065A 1985-07-09 1986-07-03 Machine vibrante pour le traitement de surface des objets en vrac Expired EP0209004B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86109065T ATE43084T1 (de) 1985-07-09 1986-07-03 Laeppeinrichtung zur oberflaechenverbesserung von schuettfaehigem gut.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3524476 1985-07-09
DE3524476 1985-07-09

Publications (2)

Publication Number Publication Date
EP0209004A1 true EP0209004A1 (fr) 1987-01-21
EP0209004B1 EP0209004B1 (fr) 1989-05-17

Family

ID=6275311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86109065A Expired EP0209004B1 (fr) 1985-07-09 1986-07-03 Machine vibrante pour le traitement de surface des objets en vrac

Country Status (6)

Country Link
US (1) US4803811A (fr)
EP (1) EP0209004B1 (fr)
JP (1) JPS6215072A (fr)
AT (1) ATE43084T1 (fr)
CA (1) CA1302091C (fr)
DE (1) DE3663343D1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2107117C (fr) * 1991-03-26 1997-04-29 Takatoshi Takemoto Appareil servant a polir des jetons de machines a sous et a les debarrasser de l'abrasif utilise pour leur polissage
US5276998A (en) * 1992-06-08 1994-01-11 Joen Anton P Method and apparatus for washing and cleaning a workpiece
US9246024B2 (en) 2011-07-14 2016-01-26 International Business Machines Corporation Photovoltaic device with aluminum plated back surface field and method of forming same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2100098A5 (fr) * 1970-07-02 1972-03-17 Boulton Ltd William
US3935680A (en) * 1972-04-17 1976-02-03 Shikishima Tipton Mfg. Co., Ltd. Method for vibratory finishing workpieces under heavily compressed condition
DE2166843A1 (de) * 1971-05-07 1976-03-11 Siemens Ag Druckstrahler
FR2318945A1 (fr) * 1975-07-22 1977-02-18 Hoesch Werke Ag Procede et installation pour le traitement des battitures

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CA871434A (en) * 1971-05-25 H. Eppler Arthur Abrasive blast system with closed circuit rinse
US2887826A (en) * 1957-10-30 1959-05-26 Auto Specialties Mfg Co Shot blast machine
US3649490A (en) * 1968-11-12 1972-03-14 Diversified Metals Corp Method for timed electrolytic processing of masses of electrically conductive metal parts
US3676958A (en) * 1970-11-09 1972-07-18 Parke Davis & Co Vibratory cleaner
FR2193687B1 (fr) * 1972-07-26 1978-03-10 Burdin Jacques
SU566716A1 (ru) * 1975-04-25 1977-07-30 Всесоюзный Научно-Исследовательский Конструкторско-Технологический Институт Подшипниковой Промышленности Способ объемной вибрационной обработки деталей
SU709342A1 (ru) * 1976-06-07 1980-01-15 Zyryanov Boris V Устройство дл отделени обрабатываемых деталей от абразива
DE3127390A1 (de) * 1981-07-10 1983-02-10 Siemens AG, 1000 Berlin und 8000 München Galvanisiereinrichtung
JPS5937052A (ja) * 1982-08-20 1984-02-29 Toshiba Corp バリ取り方法
US4646484A (en) * 1983-10-28 1987-03-03 Aga Ab Cryogen shot blast deflashing apparatus with inert gas purging system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2100098A5 (fr) * 1970-07-02 1972-03-17 Boulton Ltd William
DE2166843A1 (de) * 1971-05-07 1976-03-11 Siemens Ag Druckstrahler
US3935680A (en) * 1972-04-17 1976-02-03 Shikishima Tipton Mfg. Co., Ltd. Method for vibratory finishing workpieces under heavily compressed condition
FR2318945A1 (fr) * 1975-07-22 1977-02-18 Hoesch Werke Ag Procede et installation pour le traitement des battitures

Also Published As

Publication number Publication date
ATE43084T1 (de) 1989-06-15
CA1302091C (fr) 1992-06-02
JPS6215072A (ja) 1987-01-23
US4803811A (en) 1989-02-14
DE3663343D1 (en) 1989-06-22
EP0209004B1 (fr) 1989-05-17

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