EP0095829A1 - Procédé et appareil pour l'ébarbage de pièces moulées métalliques - Google Patents

Procédé et appareil pour l'ébarbage de pièces moulées métalliques Download PDF

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Publication number
EP0095829A1
EP0095829A1 EP83301698A EP83301698A EP0095829A1 EP 0095829 A1 EP0095829 A1 EP 0095829A1 EP 83301698 A EP83301698 A EP 83301698A EP 83301698 A EP83301698 A EP 83301698A EP 0095829 A1 EP0095829 A1 EP 0095829A1
Authority
EP
European Patent Office
Prior art keywords
blades
pellets
impact
fins
inner ends
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.)
Withdrawn
Application number
EP83301698A
Other languages
German (de)
English (en)
Inventor
John Turner Politz
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.)
ERVIN INDUSTRIES Inc
Ervin Ind Inc
Original Assignee
ERVIN INDUSTRIES Inc
Ervin Ind Inc
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 ERVIN INDUSTRIES Inc, Ervin Ind Inc filed Critical ERVIN INDUSTRIES Inc
Publication of EP0095829A1 publication Critical patent/EP0095829A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • 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

Definitions

  • the force with which a particular piece of shot strikes a fin is a function of the mass of the shot and the impeller speed. Impeller speeds cannot be increased significantly without risk of pitting the surface of the casting. In fact, it would be desirable to reduce the impeller speed. Increasing the size of the shot has heretofore been impracticable as well.
  • the largest shot size recognized by The Society of Automotive Engineers is SAE-S1320 (ninety percent must be retained on a screen having .1320 inch diameter openings and 100 percent must pass through a .187 inch diameter opening).
  • the largest shot used in centrifugal blast machines is about one-sixteenth inch; this shot is too small to remove fins. Even the largest SAE standard size (S-1320) produces too small a force.
  • conventional blasting machines have not been readily adaptable to large size shot which can bind conventional impeller mechanisms because of insufficient clearance between the feed mechanism and the impeller blades.
  • a rotating member is provided with a plurality of radially extending blades.
  • the rotating member is aligned so that its axis of rotation is perpendicular to the line between the member and the casting to be de-finned.
  • a plurality of impact particles are fed onto the inner ends of the blades, so that the centrifugal force of the rotating member causes the impact particles to move outwardly on the blades and to be subsequently propelled toward the casting.
  • the invention also provides a machine that is capable of centrifugally propelling particles of sufficient size to accomplish the de-finning process.
  • the machine consists of a rotatably supported member on which a plurality of radially extending blades are mounted.
  • the blades have inner ends which terminate at positions spaced a uniform and predetermined distance from the axis of rotation of the rotating member.
  • a particle supply conduit is also provided which extends into the space between the axis of rotation and the inner ends of the blades and terminates in a closely spaced relation with the blades.
  • a plurality of impact pellets are contained on the machine in a feed spout which communicates with the supply conduit.
  • a forced air source also communicates with the supply conduit and operates to force the impact pellets through the conduit and onto the inner ends of the blades. Rotation of the rotating member causes the impact pellets to fly off the blades in a discernable pattern and impact against a casting.
  • the distance between the terminal end of the supply conduit path and the inner ends of the blades is greater than the largest diameter of the impact pellets, so that the flow of pellets onto the blades does not interfere with blade movement.
  • the machine is thus adaptable to impact pellets of sizes which exceed the maximum standard SAE size.
  • the amount of force, and thus the size of impact pellets, required to de-fin a particular object depends to some extent on the size and shape of the object, the wall thickness, the type of metal and various other factors involved in the casting process. For example, it has been found that in the de-finning of engine blocks for automobiles, an impact pellet size of one-fourth inch is optimal.
  • the machine of this invention is capable of performing other functions additional to and other than de-finning.
  • the machine can also be used in removing sand and other excess materials or for smoothing rough edges. It can be used for cleaning and for polishing. It may also be desirable to provide a rotating wheel which rotates at variable speeds and to adapt the feed means to various sizes of impact pellets so that the machine can most efficiently perform the various functions.
  • the de-finning apparatus 10 includes a main frame 12 in which an opening 14 is provided.
  • the frame 12 is fixed relative to the object to be de-finned, and is aligned so that the opening 14 faces the object.
  • a rotating member 16 is mounted on the frame 12 for rotation about an axis 18.
  • a plurality of radially extending blades 20 are replaceably mounted on the rotating member 16.
  • the blades 20 have inner ends 22 that terminate at positions spaced a uniform and predetermined distance from the axis 18.
  • the machine 10 further includes a supply conduit 24 which extends into the space between the axis 18 and the inner ends 22 of the blades 20.
  • An opening 26 is provided in the terminal end 28 of the conduit 24. The distance between the blade inner ends 22 and the conduit terminal end 28 is greater than the largest diameter of the particles to be propelled by the machine 10.
  • a plurality of impact pellets 30 are carried on the machine 10 in a supply hopper (not shown) which supplies a feed spout 32.
  • the impact pellets 30 are of a size substantially greater than the largest of the SAE standard sizes of shot 31 shown in Fig. 6.
  • the pellets shown in Fig. 7 are approximately one-fourth inch in diameter, which has been found to be the preferred size for de-finning cast engine blocks. Different sizes of pellets 30 will be required for different types of cast objects, and it is to be understood that the invention is not limited to pellets 30 of the size shown in Fig. 7 nor to pellets 30 of any particular size.
  • the pellets 30 have a diameter which is 1.33 times as large and a mass which is 2.37 times as large as the largest SAE standard size shot. In comparison with one-sixteenth inch shot, which is the largest size typically used in conventional machines, the pellets 30 are 4 times as large and 64 times as heavy.
  • the feed spout 32 communicates with the supply conduit 24 so that impact pellets 30 are fed under the force of gravity into the conduit 24.
  • An inner passage 34 is provided on the machine 10 and also communicates with the supply conduit 24.
  • a turbine or other forced air source (not shown) is connected to the passage 34 and directs a flow of forced air through the conduit 24 toward the blades 20.
  • the flow of air within the passage 34 and conduit 24 is maintained at a sufficient pressure to force the impact pellets 30 through the conduit 24 and onto the inner ends 22 of the blades 20.
  • the initial velocity of the air flow must be sufficient to deliver the impact pellets 30 onto the blades 20; the velocity required varies with the weight of the pellets 30 and the length of the gap between the conduit end 28 and the blade inner ends 22.
  • the invention is particularly well adapted for operations involving cast objects such as engine blocks, as seen in Figs. 2-5.
  • the invention is capable of being used with other types of objects such as crank shafts, manifolds, and engine heads and is not limited to use with engine blocks.
  • a typical cast object 36 After removal from a mold, a typical cast object 36 contains various imperfections such as sand, indicated at 38, clinging to the surface of the casting, rough edges, indicated at 40, and fins, indicated at 42. These various defects are removed as follows. As seen in Fig. 5, the cast object 36 is supported within the cabinet 44.
  • the casting 36 can be rotatably or otherwise movably mounted in the cabinet 44 so that all its surfaces are exposed to the spray of impact pellets 30 or it can be manipulated so that only certain surfaces are subjected to the pellets 30.
  • One or more of the machines 10 are mounted on the cabinet 44 with the openings 14 thereof facing the interior of cabinet and in particular facing the object 36. The number of machines 10 chosen will depend on various factors including the shape of the spray pattern desired.
  • Impact pellets 30 and forced air are then fed into the conduit 24 of each machine 10.
  • the pellets 30 are delivered to the inner ends 22 of the blades 20.
  • centrifugal force causes the pellets 30 to move outwardly on the blades 20.
  • the accumulative effect of centrifugal propulsion of a plurality of pellets 30 is a spray pattern which covers the surface of the cast object 36.
  • the invention thus provides a new method and apparatus for removing fins and other excess materials from metal castings.
  • the method of this invention involves centrifugal propulsion of particles which impinge upon the cast object with a force sufficient to remove fins.
  • the machine 10 is adapted to propel impact pellets 30 which are of a size substantially greater than the particulate shot used in conventional blasting machines. The invention thus removes the need to manually chip away fins and other excess materials, thereby saving substantial time and expense.
  • shot can be loaded into the feed spout 32, and the same apparatus 10 can be used, if desired, to shot blast the object 36.
  • the apparatus 10 can be equipped with two supply hoppers communicating with the spout 32, one containing shot and the other impact pellets 30 for subjecting a casting to the simultaneous action of the pellets and shot or first the action of the pellets and then the shot.
  • other apparatus can be used for blast cleaning and objects 36 can be successively subjected to impact pellets 30 from the apparatus 10 for de-finning purposes.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP83301698A 1982-05-27 1983-03-25 Procédé et appareil pour l'ébarbage de pièces moulées métalliques Withdrawn EP0095829A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US38283382A 1982-05-27 1982-05-27
US382833 1982-05-27

Publications (1)

Publication Number Publication Date
EP0095829A1 true EP0095829A1 (fr) 1983-12-07

Family

ID=23510584

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83301698A Withdrawn EP0095829A1 (fr) 1982-05-27 1983-03-25 Procédé et appareil pour l'ébarbage de pièces moulées métalliques

Country Status (4)

Country Link
EP (1) EP0095829A1 (fr)
JP (1) JPS58211858A (fr)
AU (1) AU1262383A (fr)
ES (1) ES520998A0 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113263455A (zh) * 2021-06-04 2021-08-17 安徽省康宇水电机械成套设备有限公司 一种离心泵零部件打磨设备

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1990006195A1 (fr) * 1988-12-02 1990-06-14 The Broken Hill Proprietary Company Limited Ensemble a ebavurer servant a enlever les bavures et autres defauts de la surface de pieces coulees

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800474A (en) * 1972-06-26 1974-04-02 B Fuerst Liner plate junction seal
CH559084A5 (fr) * 1973-11-22 1975-02-28 Fischer Ag Georg

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3800474A (en) * 1972-06-26 1974-04-02 B Fuerst Liner plate junction seal
CH559084A5 (fr) * 1973-11-22 1975-02-28 Fischer Ag Georg

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113263455A (zh) * 2021-06-04 2021-08-17 安徽省康宇水电机械成套设备有限公司 一种离心泵零部件打磨设备

Also Published As

Publication number Publication date
ES8406925A1 (es) 1984-09-01
JPS58211858A (ja) 1983-12-09
ES520998A0 (es) 1984-09-01
AU1262383A (en) 1983-12-01

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19840514

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19850929

RIN1 Information on inventor provided before grant (corrected)

Inventor name: POLITZ, JOHN TURNER