EP0086321B1 - Verfahren zum Entgraten von aus körnigem Material gefertigten Sandkernen - Google Patents

Verfahren zum Entgraten von aus körnigem Material gefertigten Sandkernen Download PDF

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Publication number
EP0086321B1
EP0086321B1 EP83100035A EP83100035A EP0086321B1 EP 0086321 B1 EP0086321 B1 EP 0086321B1 EP 83100035 A EP83100035 A EP 83100035A EP 83100035 A EP83100035 A EP 83100035A EP 0086321 B1 EP0086321 B1 EP 0086321B1
Authority
EP
European Patent Office
Prior art keywords
bodies
medium
grinding
sand cores
rigid foam
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
EP83100035A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0086321A1 (de
Inventor
Karl Frech
Hans Tölle
Hartmut Lüdke
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.)
Theodor Heimeier Metallwerk KG
Theodor Heimeier Metallwerk GmbH
Carl Kurt Walther GmbH and Co KG
Original Assignee
Theodor Heimeier Metallwerk KG
Theodor Heimeier Metallwerk GmbH
Carl Kurt Walther GmbH and 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 Theodor Heimeier Metallwerk KG, Theodor Heimeier Metallwerk GmbH, Carl Kurt Walther GmbH and Co KG filed Critical Theodor Heimeier Metallwerk KG
Priority to AT83100035T priority Critical patent/ATE13985T1/de
Publication of EP0086321A1 publication Critical patent/EP0086321A1/de
Application granted granted Critical
Publication of EP0086321B1 publication Critical patent/EP0086321B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/18—Finishing

Definitions

  • the invention relates to a method for deburring sand cores made of granular material, in which the sand cores are freed of their orat by an abrasion process under the action of an abrasive medium.
  • DE-A-2 731 802 It is known from DE-A-2 731 802 to deburr sand cores consisting of core sand and core binders, in particular for foundry purposes, in a drum container containing granular scouring material. As is known, the deburred sand cores then receive a size coating by immersing them in a corresponding suspension. After the dipped sand cores have dried, the coating consisting of the size remains on the surface, as a result of which the large pores of the sand cores are closed.
  • the object of the invention is to provide a method of the type required, by means of which such molded parts can be deburred by machine at short notice and at the same time obtain such a size coating with no drying times.
  • the cores are accordingly supplied at one point of the ring vibrator and discharged at another, preferably using a discharge sieve which allows the abrasive body medium to be fed back into the vibrator.
  • the sand cores are deburred by the abrasive body medium.
  • the abrasive medium containing the sizing agent gives them a uniform sizing coating at all points, which leads to the desired surface effect of the sand cores.
  • Processing is preferably carried out with a large vibration amplitude.
  • the rigid foam bodies are designed in such a way that slight indentation is possible with a fingernail.
  • the abrasive body medium is through continuously metered addition of liquid, for. B. water, to keep at the dust limit and contains, in addition to the approximately 50% proportion of rigid foam bodies, about 15% aluminum pencils, conical grinding wheels and sizing powder.
  • the sand cores get an optimal coating with sizing powder if the sizing agent content is about 10% of the volume of the grinding media.
  • Particularly good embedding of the sand cores in the ring vibrator and optimal deburring are achieved if the hard foam bodies are designed as cylindrical rods and have a size comparable to that of the abrasive bodies and the size of the aluminum pins is only a fraction of the same.
  • the cylindrical rods have a diameter of approximately 8 mm with a total length of approximately 16-20 mm.
  • the end faces should preferably run obliquely to the longitudinal axis of the cylindrical rods.
  • the conical grinding wheels they are those with a base diameter of approx. 12 mm.
  • the aluminum pins on the other hand, have a diameter of 2 mm and are approx. 6 mm long.
  • the device for carrying out the method preferably consists in that a ring vibrator is assigned to the edge of the ring channel a water spray device which takes effect when dust is formed and has nozzles directed towards the ring channel interior.
  • the nozzles are arranged in a uniform distribution, so that the abrasive body medium receives an equal degree of moisture over the entire length of the ring channel near the dust limit.
  • a ring vibrator designated as a whole by 1.
  • This has a resiliently supported against a base frame 2, lying on a horizontal plane annular groove 3.
  • vibrations are transmitted to the annular groove 3, which cause the abrasive medium contained therein to circulate on a helical path.
  • a discharge channel 6, formed by container side walls 4, 5, extends in a secant-like orientation to the ring channel 3.
  • a discharge and separation device is accommodated in the latter.
  • the same has a removable, combined sieve separating box, the separating sieve 7 in the discharge position illustrated in FIG.
  • a water spray device 9 is assigned to the edge of the channel 3. Specifically, this has a tube 11, which is carried by means of holding brackets 10 and is adapted to the course of the ring gutter and is equipped with nozzles 12 directed towards the interior of the gutter.
  • the pipe 11 is connected to a water pipe, not shown.
  • the abrasive body medium located in the ring groove 3 is composed of approx. 50% rigid polypropylene foam bodies 13, approx. 25% conical abrasive bodies 14, approx. 15% aluminum pins 15 and approx. 10% size powder.
  • the polypropylene rigid foam body 13 are cylindrical in shape with a diameter x of approximately 8 mm. Their length y is approximately 16-20 mm.
  • the end faces 16 and 17 extend obliquely to the longitudinal axis of these cylindrical rods at an angle alpha of approximately 30 ° such that the end faces 16, 17 are arranged parallel to one another.
  • the base diameter z is approximately 12 mm.
  • the cone tip is slightly flattened, so that there is a total height h of the conical grinding wheels of approx. 13 mm.
  • the grinding bodies can form a fillet 18.
  • the aluminum pins 15 are also cylindrical. Their diameter u is 2 mm and their length v is approximately 6 mm.
  • the sizing agent is added. It preferably consists of a ground feldspar or mica, ie a potassium aluminum silicate, to which about 10% of powdered stearate has been added.
  • the water spray device 9 receives the impulse to supply water to the container contents via the nozzles 12 until the corresponding degree of moisture at the dust limit is reached.
  • the sand cores 19 do not damage one another because of the cushion formed by the polypropylene rigid foam bodies 13.
  • the sand cores 19 at the same time receive a size coating 20 consisting of sizing agent, which closes the pores of the sand core 19 and gives it a smooth surface.
  • the contents of the container reach the separating sieve 8 via the wall 8.
  • the sand cores 19 are discharged while the abrasive body medium plus sizing agent (insofar as it gets onto the sieve) falls through the separating sieve 7 and is thus fed back into the interior of the annular trough becomes.
EP83100035A 1982-01-18 1983-01-04 Verfahren zum Entgraten von aus körnigem Material gefertigten Sandkernen Expired EP0086321B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83100035T ATE13985T1 (de) 1982-01-18 1983-01-04 Verfahren zum entgraten von aus koernigem material gefertigten sandkernen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3201284 1982-01-18
DE19823201284 DE3201284A1 (de) 1982-01-18 1982-01-18 Verfahren zum entgraten und schlichteueberziehen von geschossenen giesskernen

Publications (2)

Publication Number Publication Date
EP0086321A1 EP0086321A1 (de) 1983-08-24
EP0086321B1 true EP0086321B1 (de) 1985-06-26

Family

ID=6153269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83100035A Expired EP0086321B1 (de) 1982-01-18 1983-01-04 Verfahren zum Entgraten von aus körnigem Material gefertigten Sandkernen

Country Status (6)

Country Link
US (1) US4560586A (es)
EP (1) EP0086321B1 (es)
JP (1) JPS58209444A (es)
AT (1) ATE13985T1 (es)
DE (2) DE3201284A1 (es)
ES (1) ES519074A0 (es)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005824C1 (en) * 1990-02-23 1991-03-07 Theodor Heimeier Metallwerk Kg, 4782 Erwitte, De Method of deburring foundry cores - has cores placed in ring vibrator and grinding bodies added to these
DE4019433C1 (en) * 1990-06-19 1991-08-29 Theodor Heimeier Metallwerk Kg, 4782 Erwitte, De Removal of flash and application of wash coating to foundry cores - comprising circulating cores in ring vibrator to which grinding medium contg. two types of grinding body is added

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3322567C2 (de) * 1983-06-23 1985-05-23 Georg Fischer GmbH, 4020 Mettmann Einrichtung zum Entgraten von als Gießerei-Kerne oder dergleichen ausgebildeten Werkstücken
DE3467105D1 (en) * 1983-09-06 1987-12-10 B & U Corp Method and apparatus for removing excess material from sand cores
US4681600A (en) * 1984-09-05 1987-07-21 Extrude Hone Corporation Cutting tool fabrication process
JPH0421626Y2 (es) * 1987-02-06 1992-05-18
JPH0539804Y2 (es) * 1988-07-20 1993-10-08
US4956200A (en) * 1988-11-21 1990-09-11 The Burns & Russell Company Texturing a mold surface
US5814161A (en) * 1992-11-30 1998-09-29 Massachusetts Institute Of Technology Ceramic mold finishing techniques for removing powder
CN104550711A (zh) * 2014-12-17 2015-04-29 江苏凌特精密机械有限公司 一种振动环制造工艺
CN112756561B (zh) * 2020-11-25 2022-10-04 昆山中超自动化有限公司 一种击打型砂芯去毛边设备

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7118607U (de) * 1971-08-12 Alcan Aluminiumwerke Gmbh Leicht entfernbare Kerne und Form teile fur Gießereizwecke
US1991013A (en) * 1932-04-23 1935-02-12 Western Brick Company Method and apparatus for coating the interior of mold surfaces
US2174755A (en) * 1936-07-14 1939-10-03 Durite Plastics Inc Manufacture of synthetic resin bonded abrasive articles
US2294239A (en) * 1938-04-09 1942-08-25 Durite Plastics Inc Abrasive article
US2308854A (en) * 1938-06-28 1943-01-19 Norton Co Abrasive article
US2817603A (en) * 1953-03-04 1957-12-24 Myron A Coler Method of producing electrically conductive article
DE1009884B (de) * 1955-07-08 1957-06-06 Vaw Ver Aluminium Werke Ag Verfahren zur Vorbehandlung von Werkstuecken aus Aluminium oder Aluminiumlegierungen zur Herstellung hochglaenzender, anodisch oxydierter Oberflaechen
US3424607A (en) * 1964-06-15 1969-01-28 Kalb Ind Inc De Atactic polyolefin release agents
US3313067A (en) * 1964-10-20 1967-04-11 Gen Electric Process for deflashing articles
US3450551A (en) * 1966-02-01 1969-06-17 Sun Oil Co Process for treating molds
US3684466A (en) * 1971-01-28 1972-08-15 Joseph V Petrone Organic polymer bonded tumbling chip
BE791956A (fr) * 1971-12-03 1973-03-16 Tido Chemisch Tech Produkte G Revetement a usage metallurgique
DE2403828B2 (de) * 1974-01-28 1975-12-04 Ideal-Standard Gmbh, 5300 Bonn Verfahren zum Entgraten von aus zwei Hälften gebildeten Sandkernen für die Gießereitechnik
US4086067A (en) * 1975-03-12 1978-04-25 International Telephone And Telegraph Corporation Porous sintered abrasive articles and method of manufacture
DE2654167C3 (de) * 1976-11-30 1979-10-04 Robert Bosch Gmbh, 7000 Stuttgart Verfahren zum Entgraten von Sandkernen für die Gießereitechnik
DE2731802A1 (de) * 1977-07-14 1979-02-01 Klein Alb Kg Verfahren und vorrichtung zum entgraten von sandkernen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4005824C1 (en) * 1990-02-23 1991-03-07 Theodor Heimeier Metallwerk Kg, 4782 Erwitte, De Method of deburring foundry cores - has cores placed in ring vibrator and grinding bodies added to these
DE4019433C1 (en) * 1990-06-19 1991-08-29 Theodor Heimeier Metallwerk Kg, 4782 Erwitte, De Removal of flash and application of wash coating to foundry cores - comprising circulating cores in ring vibrator to which grinding medium contg. two types of grinding body is added

Also Published As

Publication number Publication date
ATE13985T1 (de) 1985-07-15
ES8308729A1 (es) 1983-10-16
JPS58209444A (ja) 1983-12-06
ES519074A0 (es) 1983-10-16
DE3360306D1 (en) 1985-08-01
DE3201284A1 (de) 1983-08-04
US4560586A (en) 1985-12-24
EP0086321A1 (de) 1983-08-24

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