EP0161260B1 - Method for the abrasive treatment of a casting - Google Patents

Method for the abrasive treatment of a casting Download PDF

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Publication number
EP0161260B1
EP0161260B1 EP19840902312 EP84902312A EP0161260B1 EP 0161260 B1 EP0161260 B1 EP 0161260B1 EP 19840902312 EP19840902312 EP 19840902312 EP 84902312 A EP84902312 A EP 84902312A EP 0161260 B1 EP0161260 B1 EP 0161260B1
Authority
EP
European Patent Office
Prior art keywords
casting
media
vibrated
vibrating
acceleration
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
Application number
EP19840902312
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0161260A1 (en
EP0161260A4 (en
Inventor
Albert Musschoot
Robert H. Bond
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.)
General Kinematics Corp
Original Assignee
General Kinematics Corp
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 General Kinematics Corp filed Critical General Kinematics Corp
Publication of EP0161260A1 publication Critical patent/EP0161260A1/en
Publication of EP0161260A4 publication Critical patent/EP0161260A4/en
Application granted granted Critical
Publication of EP0161260B1 publication Critical patent/EP0161260B1/en
Expired legal-status Critical Current

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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
    • B24B31/06—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
    • B24B31/064—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 the workpieces being fitted on a support
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/001—Removing cores
    • B22D29/005—Removing cores by vibrating or hammering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
    • B22D31/002—Cleaning, working on castings

Definitions

  • This invention relates to a method and apparatus for the abrasive treatment of a workpiece according to the preambles of claims 1 and 4.
  • a specific example of the general problem is in the casting industry wherein a variety of metal casting processes are used, with one such process involving the use of inexpensive styrofoam patterns which have been coated with a ceramic-type material.
  • the patterns can be formed with intricate shapes having depressions, cavities, internal passages, crevices, chambers and the like.
  • the pattern is positioned in a mould box and sand is formed therearound ready for casting.
  • the styrofoam pattern melts away while the ceramic-type coating holds its shape long enough to form the metal casting.
  • the ceramic type coating however also breaks up during the process and in doing so leaves particles of coating of foreign material or of sand adhered to the internal and external surfaces of the casting.
  • a method for the abrasive treatment of a part comprising vibrating a mass of abrasive media substantially in a vertical direction, moving the workpiece to be abrasively treated within the vibrated media, and raising the workpiece when it has been abrasively treated substantially in a vertical direction out of the media.
  • the part to be abrasively treated is a rotationally symmetrical workpiece which is moved within the vibrated media by being rotated about a fixed axis.
  • the method of GB-A-1067656 is not suitable for abrasively treating castings most of which are not symmetrical, since to rotate them in vibrated media will clean and wearthe corners but leave the low areas on the casting untouched.
  • the aforesaid generally disclosed method is characterised in that the workpiece to be abrasively treated is a casting with internal and external surfaces, the casting is moved within the vibrated media by being vibrated substantially in a vertical direction with a frequency and amplitude to produce an acceleration of the casting greater than 1 g, the media is vibrated with a frequency and amplitude to produce an acceleration thereof also greater than 1g by which the media will fluidize and flow across the internal and external surfaces of the vibrating casting to scrub particles therefrom, and the abrasively treated casting is raised, whilst still being vibrated, out of the media by which the media and freed particles are removed from the casting.
  • An advantage of the method of the invention over the method disclosed in GB-A-1067656 is that it is suitable for abrasively treating not only assymmetrical castings but also castings in general having internal and external surfaces formed by depressions, cavities, internal passages, crevices, chambers and the like, since the media in the fluidized state will flow into all such areas to clean the casting inside and out. Moreover, by vibrating the casting itself and continuing to vibrate it as it is raised and removed from the media ensures that the free particles scrubbed from the casting as well as any media adhering thereto will be discharged, leaving the casting clean.
  • An apparatus for carrying out the method generally disclosed in GB-A-1067696 generally comprises a container of abrasive media, means for vibrating the container to vibrate the media therein substantially in a vertical direction, means for moving the workpiece to be abrasively treated within the vibrated media, and means for raising the workpiece when it has been abrasively treated substantially in a vertical direction out of the media.
  • the aforesaid generally disclosed apparatus of GB-A-1067696 is characterised in that the apparatus is for the abrasive treatment of a workpiece in the form of a casting with internal surfaces and external surfaces, the means for moving the casting within the vibrated media is operable to vibrate the casting substantially in a vertical direction, the means for vibrating the container is operable to vibrate the media with a frequency and amplitude to produce an acceleration thereof greater than 1 g by which the media will fludize and flow across the internal and external surfaces of the vibrated casting to scrub particles therefrom, and the means for raising the casting out of the media is operable to do so, whilst the casting vibrating means is vibrating the casting, by which to assist removal of the media and freed particles from the casting.
  • a vibratory scrubber 10 is shown specifically as scrubbing a casting.
  • the scrubber 10 includes a container 12 for particulate scrubbing media 14, such as steel shot, mixture of liquid and solids or any other fluidizable material, and the container 12 is fixed to a platform 16. Due to the weight of the container 12 and media 14, it is necessary to have a suitably reinforced platform 16, as for example by connecting spaced plates 18, 20 with a bracing structure 22.
  • the platform 16 is mounted on four corners to springs 24 which are themselves mounted on a base 26 suitably secured to the floor 30.
  • a set of vibration generators 34 of any well known type is provided with the vibration generators shown being in the form of electric motors 36 having shafts 38 carrying eccentric weights 40.
  • the generators are suspended from the bottom of the platform 16 in order to produce the vibrations.
  • the vibration generators 34 may be of the type shown in U.S. Patent No. 3,358,815 where the effective force of the eccentric weights may be varied from zero to maximum and thus produce a variation in stroke as desired.
  • Other types of vibration generators could be substituted for the eccentric vibration generators 34, such as hydraulic vibrators and the like.
  • the vibration generators 34 are energized to produce a vibratory motion for the container 12 and its contents substantially in a vertical direction and in excess of the acceleration due to gravity i.e. greater than 1g.
  • the acceleration in g's can be calculated by the formula where S is the amplitude of the stroke in inches and F is the frequency of the stroke in strokes per minute. For example, with a frequency of 3600 strokes per minute and a stroke amplitude of 0.007 inches, there is produced an acceleration of 1.29 g's on the container 12 and the media 14. This acceleration causes the media 14 to become fluidized, and thereby to flow freely.
  • a part or casting supporting structure 44 Suspended by a chain 42 above the container 12 is a part or casting supporting structure 44 comprised of a frame 46, made of I-beams 48, having sufficient rigidity to support and vibrate in a substantially vertical direction a part or casting 50.
  • a mounting beam 52 depends vertically downward from the frame 46 and is adaptable for mounting a desired number and type of part or casting 50.
  • two castings 50, 50 are fixed to the mounting beam 52 by bolting flanges 54 of the castings 50 onto the mounting beam 52.
  • other means of fixing the parts or castings 50 shown, as well as other types of parts or castings, to the mounting beam 52 would be suitable and apparent to those skilled in the art. It is important that the openings 53 into the passageways 55 be kept open and unobstructed so that the media 14 can flow freely into and out of the passageways.
  • the frame 46 is directly connected to a second set of vibration generators 60, each of which in the illustrated form also comprises an electric motor 62 driving a shaft 64 having synchronized eccentric weights 66 on both ends.
  • a second set of vibration generators 60 each of which in the illustrated form also comprises an electric motor 62 driving a shaft 64 having synchronized eccentric weights 66 on both ends.
  • the second set of vibration generators 60 are suspended from an upper plate 70 by a pair of springs 72.
  • the upper plate 70 has a bracket 74 which is connected to the supporting chain 42.
  • the upper plate 70 is isolated from the vibrations of the vibration generators 60 by the springs 72.
  • Suitable means are provided to manipulate the chain 42 so as to lower the frame 46 and mounting beam 52 to locate the castings 50 in the media 14, and also to raise the frame 46 from the media ready for removal of the castings or parts 50.
  • Castings or parts 50 may be manufactured using styrofoam patterns which have been coated with a ceramic-type material. During the casting process, the styrofoam pattern is essentially melted away and the ceramic-type coating holds its shape long enough to form the casting 50 but then breaks up as well. This process leaves particles or foreign material 80 (see Figure 3) of the coating as well as other materials adhered to the external surfaces 82 and internal surface 84 of the casting 50. The scrubber 10 is used to remove these particles or foreign material 80 from all surfaces both external 82 and internal 84 of the casting 50.
  • the castings or parts 50 are fixed to the mounting beam 52 and then the vibration generator 34 for the container 12 and media and the generator 60 for the frame 46 and parts 50 are energized.
  • the vibrating frame 46 is lowered to locate the parts or castings 50 into the vibrating media 14 which is easily accomplished inasmuch as the media 14 in the container 12 is fluidized by the vibrations of the generators 34.
  • the media 14 thus easily flows about the casting 50 and into crevices and passageways in the casting 50, and the vibration of the casting 50 itself ensures that the media 14 will flow freely into any such crevices and passageways in the casting 50 as well.
  • the vibration generators 60 on the supporting structure 44 may continue to be driven as the structure 44 is raised to remove the part or casting 50 from the container 12 so as to discharge the media and freed foreign material or particles 80 from the passageways 55 in the parts or castings.
  • FIG. 5 An alternative embodiment of the vibratory scrubber 10' is shown in Figure 5.
  • the same reference numerals are used for the members that are identical to Figure 1.
  • This scrubber 10' uses a two mass sytem for vibrating the part or casting 50.
  • the set of vibration generators 60 used to apply a vibratory motion to the frame 52 and part 50 are not directly attached to the frame 46', but rather are attached to a second set of springs 88 extending between the first set of vibration generators 60 and a working weight 90 carried by the frame 46' and mounting beam 52.
  • the second set of springs 88 are used to tune the vibrations of the frame 46 for enhacing the vibratory motion of the part or casting 50.
  • the casting may be vibrated at a frequency and amplitude to produce an acceleration thereof that varies from the acceleration produced on the media by the frequency and amplitude at which the media is vibrated, both such accelerations being greater than 1g.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Gas Separation By Absorption (AREA)
  • Bridges Or Land Bridges (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP19840902312 1983-11-09 1984-05-29 Method for the abrasive treatment of a casting Expired EP0161260B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US54982783A 1983-11-09 1983-11-09
US549827 1983-11-09

Publications (3)

Publication Number Publication Date
EP0161260A1 EP0161260A1 (en) 1985-11-21
EP0161260A4 EP0161260A4 (en) 1986-02-20
EP0161260B1 true EP0161260B1 (en) 1989-08-23

Family

ID=24194515

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840902312 Expired EP0161260B1 (en) 1983-11-09 1984-05-29 Method for the abrasive treatment of a casting

Country Status (6)

Country Link
EP (1) EP0161260B1 (ja)
JP (1) JPS61500351A (ja)
AU (1) AU558075B2 (ja)
DE (1) DE3479484D1 (ja)
FI (1) FI77170C (ja)
WO (1) WO1985002136A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3225356B1 (en) * 2016-04-01 2023-03-01 Rolls-Royce plc Methods of vibro-treating and vibro-treating apparatus

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2649919B1 (fr) * 1989-07-21 1991-10-04 Peugeot Installation de nettoyage de pieces de fonderie
JP2550231B2 (ja) * 1991-06-18 1996-11-06 株式会社日立製作所 磁気記録媒体の製造方法
WO2000029171A1 (de) * 1998-11-14 2000-05-25 MTU MOTOREN- UND TURBINEN-UNION MüNCHEN GMBH Anordnung zur feinbearbeitung von rotationssymmetrischen bauteilen
JP2010131675A (ja) * 2007-03-02 2010-06-17 Ee P C Aero Specialty Kk 振動式研磨処理方法および装置
US10678896B2 (en) 2015-06-30 2020-06-09 Samsung Electronics Co., Ltd. Methods and apparatuses for updating user authentication data
CN114502323A (zh) * 2019-10-10 2022-05-13 3M创新有限公司 改变工件表面的方法
JP7331637B2 (ja) * 2019-11-05 2023-08-23 トヨタ自動車株式会社 付着物除去方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3230669A (en) * 1963-03-05 1966-01-25 Boeing Co Deburring apparatus
GB1067656A (en) * 1965-12-22 1967-05-03 Wissenchaftlich Tech Zentrum A Method for the abrasive treatment of workpieces
US3581440A (en) * 1969-05-27 1971-06-01 Shell Oil Co Resonant apparatus for cleaning castings and the like
JPS5038860U (ja) * 1973-08-08 1975-04-22
JPS583960Y2 (ja) * 1978-09-27 1983-01-24 株式会社日立製作所 ピストン
SU799940A1 (ru) * 1979-04-11 1981-01-30 Среднеазиатский Филиал Государственноговсесоюзного Ордена Трудовогокрасного Знамени Научно-Исследо-Вательского И Технологическогоинститута Pemohta И Эксплуатациимашинно-Тракторного Парка Установка дл вибрационнойОчиСТКи издЕлий
CA1177221A (en) * 1980-12-04 1984-11-06 General Kinematics Corporation Vibratory method for packing foundry sand into a pattern prior to the pouring of molten metal
JPS5947156A (ja) * 1982-09-10 1984-03-16 Shintou Bureetaa Kk 油圧振動式表面研摩方法およびその装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3225356B1 (en) * 2016-04-01 2023-03-01 Rolls-Royce plc Methods of vibro-treating and vibro-treating apparatus

Also Published As

Publication number Publication date
FI852702L (fi) 1985-07-08
EP0161260A1 (en) 1985-11-21
AU2967184A (en) 1985-06-03
WO1985002136A1 (en) 1985-05-23
FI77170C (fi) 1989-02-10
FI852702A0 (fi) 1985-07-08
AU558075B2 (en) 1987-01-15
FI77170B (fi) 1988-10-31
JPH0547349B2 (ja) 1993-07-16
EP0161260A4 (en) 1986-02-20
JPS61500351A (ja) 1986-03-06
DE3479484D1 (en) 1989-09-28

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