EP0173096A2 - Boîte à noyau pour noyaux de fonderie - Google Patents

Boîte à noyau pour noyaux de fonderie Download PDF

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Publication number
EP0173096A2
EP0173096A2 EP85109563A EP85109563A EP0173096A2 EP 0173096 A2 EP0173096 A2 EP 0173096A2 EP 85109563 A EP85109563 A EP 85109563A EP 85109563 A EP85109563 A EP 85109563A EP 0173096 A2 EP0173096 A2 EP 0173096A2
Authority
EP
European Patent Office
Prior art keywords
core sleeve
core
wall
loose parts
sleeve according
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Withdrawn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
EP85109563A
Other languages
German (de)
English (en)
Other versions
EP0173096A3 (fr
Inventor
Otto Tauber
Alfons Döring
Hermann Heckers
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.)
Klein Schanzlin and Becker AG
Original Assignee
Klein Schanzlin and Becker 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 Klein Schanzlin and Becker AG filed Critical Klein Schanzlin and Becker AG
Publication of EP0173096A2 publication Critical patent/EP0173096A2/fr
Publication of EP0173096A3 publication Critical patent/EP0173096A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C7/00—Patterns; Manufacture thereof so far as not provided for in other classes
    • B22C7/06—Core boxes

Definitions

  • the invention relates to a core sleeve for the pneumatic production of casting cores from sand, with loose parts arranged inside the core sleeve and lying against its wall, which are to be removed after the core sleeve has been filled.
  • the known core boxes are mostly made of aluminum mainly for reasons of weight saving, the removable lot parts are often made of bronze. In addition, plastics or wood are also used. In any case, they are materials with low wear resistance.
  • core liners constantly come into contact with sand during their use, which in itself has a very abrasive effect.
  • the wear effect given when blowing in or shooting in the sand with compressed air is increased above all if the compressed air, together with the sand entrained by it, breaks through at leaky points and widens the existing opening in a short time. This danger is particularly present on the contact surfaces of the loose parts. There may be gaps, which may initially be very narrow, but gradually widen to slots that allow the passage of compressed air and sand.
  • the finished core shows defects in the form of porous sand spots and crumbled edges where compressed air has passed. Since these defects must not be transferred to the casting, the core must be repaired by hand. The core sleeve in turn is subject to rapid wear.
  • the object on which the invention is based is therefore to prevent the formation of slots on the contact surfaces of the loose parts.
  • This object is achieved according to the invention by one or more seals made of an elastic material for the seams existing between the wall of the core sleeve and the contact surfaces of the loose parts.
  • the seal according to the invention can be implemented in various ways. In this way, shaped parts with an elastic surface that are adapted to the contour of the wall can be inserted into the core sleeve; the wall can also be provided with an elastic coating; finally, the elastic coating can be provided on the contact surfaces of the loose parts. While the first two alternatives have the additional advantage of protecting the wall against wear, the last alternative speaks for the simple way in which they are implemented, which also allows easy retrofitting of core liners in use.
  • FIG. 1 shows a section from a conventional core box with loose parts
  • FIG. 2 shows a corresponding section from a core box according to the invention.
  • the fabricated in two core boxes cores equal to each other, they find in the production of centrifugal p urnpenlaufwegn use.
  • the core sleeve of Fig.1 1 consists of a base body 1, a cover 2 and several loose parts 3 evenly distributed over the circumference of the round core sleeve, each of which is provided with an insertion rib 4.
  • the insertion ribs 4 serve to hold the loose parts 3, which each have two end faces against the walls of the core sleeve.
  • Such a sudden transition leads to porous spots on the opposite side and to a break-off of the edges of the core located next to the loose parts 3, with the sanding effect of the core sand resulting in an expansion of the slot allowing the transition.
  • This results in rapid wear of the core sleeve and increasingly severe defects in the finished core, which have to be eliminated in complex manual work.
  • the core sleeve according to the invention shown in FIG. 2 basically also consists of the parts already mentioned in the subject of FIG. 1, that is to say a base body 6, a cover 7 and loose parts 8.
  • a base body 6 a cover 7 and loose parts 8.
  • the walls of the base body 6 and the cover 7 are provided with a vulcanized-on cover 9 made of elastic material.
  • the loose parts 8 are provided with insertion ribs 10, each of which has a guide 11 adjoining the loose part 8.
  • the length f of this guide 11 is less than the length g of the part of the plug-in rib 10 protruding from the base body 6. This ensures that when the loose parts 8 are removed from the core by a force exerted on the underside 12 of the plug-in rib 10, after pressure directed above the guide 11 is overcome before the insertion rib '10 disappears in the base body 6.
  • An additional elastic seal 13 provided in the base body 6 encloses the insertion rib 10 located in its lower end position, which results in an additional seal of the cavity 5 with respect to the outside of the core sleeve.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Casting Devices For Molds (AREA)
EP85109563A 1984-08-28 1985-07-30 Boíte à noyau pour noyaux de fonderie Withdrawn EP0173096A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3431493 1984-08-28
DE19843431493 DE3431493C1 (de) 1984-08-28 1984-08-28 Kernbuechse fuer Giesskerne

Publications (2)

Publication Number Publication Date
EP0173096A2 true EP0173096A2 (fr) 1986-03-05
EP0173096A3 EP0173096A3 (fr) 1987-01-07

Family

ID=6244009

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85109563A Withdrawn EP0173096A3 (fr) 1984-08-28 1985-07-30 Boíte à noyau pour noyaux de fonderie

Country Status (5)

Country Link
EP (1) EP0173096A3 (fr)
JP (1) JPS6160241A (fr)
DE (1) DE3431493C1 (fr)
GR (1) GR851939B (fr)
IN (1) IN161905B (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102019360B (zh) * 2010-12-30 2012-11-07 沈阳黎明航空发动机(集团)有限责任公司 一种空心支板型芯的快速成型方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3103716A (en) * 1961-01-03 1963-09-17 Ford Motor Co Core box
US3491825A (en) * 1968-01-18 1970-01-27 Edwin F Peterson Seal means for cooperative contacting surfaces in core boxes and the like
DE3028207C2 (de) * 1980-07-25 1983-11-10 Daimler-Benz Ag, 7000 Stuttgart Verfahren zum Herstellen einer Kernkastenabdichtung

Also Published As

Publication number Publication date
IN161905B (fr) 1988-02-20
EP0173096A3 (fr) 1987-01-07
GR851939B (fr) 1985-12-09
JPS63143B2 (fr) 1988-01-05
JPS6160241A (ja) 1986-03-27
DE3431493C1 (de) 1986-03-27

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Inventor name: DOERING, ALFONS

Inventor name: HECKERS, HERMANN

Inventor name: TAUBER, OTTO