EP0199719A1 - Dispositif distributeur de sable pour fonderie. - Google Patents

Dispositif distributeur de sable pour fonderie.

Info

Publication number
EP0199719A1
EP0199719A1 EP84904050A EP84904050A EP0199719A1 EP 0199719 A1 EP0199719 A1 EP 0199719A1 EP 84904050 A EP84904050 A EP 84904050A EP 84904050 A EP84904050 A EP 84904050A EP 0199719 A1 EP0199719 A1 EP 0199719A1
Authority
EP
European Patent Office
Prior art keywords
sand
plates
apertures
pattern
flask
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
EP84904050A
Other languages
German (de)
English (en)
Other versions
EP0199719A4 (fr
EP0199719B1 (fr
Inventor
Robert H Bond
Richard B Kraus
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 EP0199719A1 publication Critical patent/EP0199719A1/fr
Publication of EP0199719A4 publication Critical patent/EP0199719A4/fr
Application granted granted Critical
Publication of EP0199719B1 publication Critical patent/EP0199719B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/10—Compacting by jarring devices only

Definitions

  • This invention relates to apparatus for forming casting molds and, more particularly, to a structure for controlling delivery of sand into a flask to define such a mold.
  • a known metal forming process employs a sand mold into which molten metal is poured and cast.
  • a pattern representing a desired part configuration, is situated within a flask or mold.
  • Sand is tamped or packed about the pattern to reproduce its contour, where ⁇ upon the pattern is removed.
  • the molten metal introduced to the mold assumes the shape of the cavity.
  • the STYROFOAM pattern has the further advantage that it will exhaust as a gas through a system of risers and gates upon introduction of the molt ⁇ en material to the mold, and will not leave a residue that might compromise the quality of the casting.
  • a hopper In a typical apparatus, a hopper is disposed above the flask and associated pattern. Generally, in most apparatus, the sand rains freely over the pattern. With nothing to interrupt the hopper flow, the incoming sand may break off portions of the pattern. Reduction of the flow rate to the flask, while preventing damage to cer ⁇ tain delicate portions of the pattern, slows the entire operation and results in a bottleneck in the assembly line. The economic consequences are apparent.
  • the present invention is specifically directed to overcoming the above enumerated deficiencies in a novel and simple manner.
  • a sand distribu ⁇ tion structure is provided beneath a supply hopper for
  • the invention has as its principal objective the delivery of sand to the pattern at a rate commensurate with the ability of the pattern to withstand impact from the sand.
  • the mold can thus be formed at the most rapid rate with ⁇ out the risk of damaging the pattern.
  • first and second apertured plates are provided and are adjustably mounted relative to each other so that selective registration can be ef- fected between the apertures to define a sand flow pas ⁇ sage therethrough.
  • the size and location of the aper ⁇ tures on the plates can be varied to choose a desired flow rate, mask a portion of the pattern entirely from the direct flow of sand and/or choose different sand flow rates over different portions of the pattern.
  • vibratory appa ⁇ ratus are provided and independently operable to sepa ⁇ rately vibrate the hopper and flask.
  • the hopper vibra ⁇ tion assures that a constant and continuous flow of sand is directed from the hopper to the plates.
  • the vibration of the flask cooperates with the plates controlling the delivery of sand to effect uniform compaction of sand about the pattern.
  • Fig. 1 is an elevation view of a vibratory sand and casting handling system having incorporated therein a preferred form of said distribution control according to the invention
  • ⁇ toATlO ⁇ Fig. 2 is a fragmentary, sectional view of the sand distribution control along line 2-2 of Fig. 1;
  • Fig. 3 is a fragmentary, sectional view of adjust ⁇ able plates associated with the sand distribution control along line 3-3 of Fig. 2;
  • Fig. 4 is a fragmentary, plan view of one of the sand distribution plates that is fixed in relationship to the apparatus and shown in relationship to a pattern therebeneath in phantom;
  • Fig. 5 is a plan view of an adjustable plate used in conjunction with the plate of Fig. 4 to adjustably define a sand passageway through the sand distribution appara ⁇ tus;
  • Fig. 6 is a plan view of the plates of Figs. 4 and 5 with the plates in operative relationship with respect to each other and the underlying pattern;
  • Fig, 7 is a plan view of an alternative structure for the adjustable plate of Fig. 5;
  • Fig. 8 is a plan view of the plates in Figs. 4 and 7 in operative relationship with each other and the under ⁇ lying pattern;
  • Fig. 9 is- a plan view of a still further alternative to the adjustable plate construction of Fig. 5;
  • Fig. 10 is a plan view with the plates in Fig. 4 and 9 in operative relationship with respect to each other and the underlying pattern.
  • FIG. 1 An exemplary sand and casting handling system is shown at 10 in Fig. 1.
  • This system is representative of the environment wherein the present invention is particu ⁇ larly suitable.
  • the system 10 of Fig. 1 com ⁇ prises a sand classifier station at 12, a delivery con-
  • veyor 14 a supply hopper 16, a flask support station at 18 and a sand distribution section at 20, which is pri ⁇ marily whereat the present invention resides.
  • the delivery conveyor 14 comprises a vertically directed, endless conveyor 22 rotating about spaced pulleys 24.
  • the conveyor 22 operates within an enclosed shroud 26 and advances sand from an inlet 28, adjacent the sand classi- bomb near the bottom of the shroud, towards a shroud cap 30.
  • the particulate falls off the upper edge 32 of the conveyor and into a bin 34 associated with the hopper.
  • the cap 30 intercepts stray particulate and diverts the same into a bin 34.
  • the bin 34 is supported independently by four up ⁇ right columns 36 which bear beneath an upper rim 38 at the upper edge 40 bounding the upper inlet 42 of the bin.
  • the bin has a main body 44 with a constant cross-sectional area.
  • An integral, tapered chamber 46 funnels material from the body 44 to the flask 48, which is supported on an elevating apparatus at 50.
  • the system 10 comprises a single station along a casting assembly line.
  • the flask 48 is transported between sta ⁇ tions by equipping the same with rails (not shown) which are guided along serially arranged rollers 52 rotatably carried on a supporting frame 53 and cooperatively defin ⁇ ing a predetermined guide path.
  • the flask is raised to its operative position shown in Fig. 2 and lowered there ⁇ from by a platform 54 bearing on the underside 56 of the flask and having associated therewith the elevating me ⁇ chanism at 50.
  • the elevating mechanism 50 comprises a
  • the flask 48 comprises a cup-shaped chamber 66 with a bottom wall 68 which supports a representative pattern 70 shown in Fig. 2 made preferably of STYROFOAM or the like.
  • the chamber has an outwardly turned peripheral rim 72 which abuts the bottom of the sand distribution sec- tion 20.
  • sand cooling chambers 76, 78 Immediately above the sand distribution section are sand cooling chambers 76, 78.
  • cooling coils 80 are provided for circulating air through the sand bed therewithin. This is required be- cause the sand is often reused in several foundry opera ⁇ tions and may be admitted to the hopper at an elevated temperature after a prior use. Cooling assures that the temperature of the sand is sufficiently low that it will not cause thermal damage to the chamber or sand distribu- tion section.
  • the sand distribution section 20 comprises a first fixed plate 82 and a second plate 84 adjustably mounted relative to the fixed first plate 82.
  • the first and second plates are both flat and have adjacent sur ⁇ faces 86, 88, which facially abut each other with the plates in sliding, juxtaposed relationship.
  • Within each of the plates are apertures which allow passage of sand.
  • the first plate 82 is shown attached adjacent opposite edges 90, 92 to the undersides 94 of angled pieces 96 secured rigidly to a supporting frame 98 associated with the sand distribution control.
  • the second plate 84 has depending flanges 100, 102 which are bored through a common line to accept a control rod 104.
  • the plate 84 is supported lengthwise, on its edges extending parallel to the line of adjusting move ⁇ ment indicated by the double ended arrow 106, by angle brackets 108 attached to the supporting frame 98.
  • the second plate is fixed in a desired position by threadably attaching nuts 110 on opposite sides of the flange 100 to the rod 104. With the plates at a desired setting, the nuts 110 are drawn towards each other to captively sur-
  • a separate nut 112 is provided threadably on the rod to abut the face 114 of the flange 102 associated with the second plate.
  • the nuts 110, 112 are released and the plate moved axially along the rod in either direction indicated by the arrow 106 until a desired flow condition is at ⁇ tained.
  • the nuts are then drawn up with the relative plate positions established.
  • a shut off actuator 116 is associated with the plate 84 to shift the plate back and forth between a fully blocked position and the set position described in the prior paragraph. Normally flow of sand is arrested as the flask is moved to and away from its station 10.
  • a fixed, integral rim 118 which conforms substantially to the rim 72 on the flask chamber.
  • the rims 72, 118 abut and seal the flask chamber 66 with the flask chamber in operative position beneath the hopper.
  • a soft, enlarged gasket 120 is interposed between the rims 72, 118 and compressibly held captive therebetween.
  • the details of the apertures in the plates 82, 84 will be described relative to Figs. 4-10.
  • the first plate 82 is shown in Fig. 4 in relationship to one of the underlying pattern fingers 81.
  • Each aperture 122 is square and bounded by edges 124 having a length X.
  • the apertures 122 are arranged in rows with each row offset from the next adjacent row an equal distance both length ⁇ wise of the rows and perpendicularly thereto.
  • Each of the apertures 222 is square with centers 126, corresponding in location to the centers 128 of the apertures 122 in the first plate 82.
  • the dimension of the edges 130 defining the aper ⁇ tures 222 is identified as Y in Fig. 5.
  • the length Y is slightly larger than the dimension X of the apertures 122 on plate 82.
  • Fig. 6 depicts the plates 82, 84 in juxtaposed rela- tionship and with the apertures 122, 222 in partial regis ⁇ tration. It can be seen that the edges 124, 130 are substantially parallel so that complete registration of the apertures 122 can be accomplished with the larger aperture 222 of the second plate.
  • the flow passage 132 defined by the registered apertures is adjustable between a fully blocked position and a completely registered position wherein the sand passage area is equal to the area of aperture 122, which is the smaller aperture.
  • the flow rate can be chosen according to need and is substan- tially uniform throughout the area beneath the plates.
  • Fig. 7 depicts an alternative construction to that in Fig. 5 for the second plate 84.
  • the apertures 322 are configured substantially identically to those in Fig. 5 and oriented in the same manner. However, three aper- tures immediately above the finger 81 are omitted so as to mask the region above the finger.
  • Figure 8 which shows the plates 82, 184 in operative, juxta ⁇ posed relationship, it can be seen that the flow will be substantially uniform and the same as that in Fig. 6 everywhere but at the blocked region at 134.
  • the fingers 81 are protected from the downcoming sand. The sand is distributed around the fingers and builds up progressively from the region around
  • FIG. 9 the apertures 422 correspond in configur ⁇ ation and orientation to the apertures 222, 322 in Figs. 5 and 7 respectively.
  • smaller apertures 136 are substituted in their stead.
  • the aper- tures 136 have a defining edge dimension Z that is less than both X and Y in the previous constructions.
  • the relative positions of modified plate 284 in Fig. 9 and plate 82 in Fig. 4 is shown with the same in operative, juxtaposed relationship.
  • the small- est apertures 136 is the limiting passage area and will account for a much smaller rate of flow over the fingers than will occur over the remainder of the flask. In the process, the fingers are protected from the heavy direct flow of sand, while buildup around the fingers occurs. The sand introduction other than over the fingers, can occur at a rapid rate.
  • a further aspect of the invention is the provision of independent vibratory means 138, 140, respectively on the supporting frame 98 associated with the hopper and the flask.
  • Both vibratory means are of a conventional construction and comprise a motor 142 having a drive shaft 144 carrying at its opposite ends eccentric weights 146.
  • the frame 98 is mounted for vibrational movement by providing integral ears 148 which are suspended on isola ⁇ tion springs 150 based on a support beam 150 spanning horizontally between upright columns 36.
  • the vibrational movement imparted by motor 142 is minimal compared with
  • the vibration through motor 143 esta ⁇ blishes a quiver that prevents any hangup of material above the plates 82, 84 associated with the sand distri ⁇ bution section.
  • the vibration imparted through motor 143 is primar ⁇ ily responsible for causing distribution of sand compact ⁇ ly about the pattern. The vibration is sufficient to prevent hangups or bridging across deep crevices and intricate formations.
  • the sand distribution section and vibratory apparatus 140, 142 cooperate to assure that the sand is managably delivered to the pattern and that the sand ultimately completely and compactly surrounds the pattern for an effective mold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)

Abstract

Dans ce dispositif, une structure de distribution de sable (20) est placée entre une hotte d'alimentation en sable (16) et un châssis (48) comportant un modèle (70). La structure de distribution de sable comprend deux plaques juxtaposées (82, 84) ayant des ouvertures; ces plaques peuvent être réglées l'une par rapport à l'autre de façon à faire varier la coïncidence de leurs ouvertures (122, 222). Il est possible, en changeant les dimensions et les emplacements des ouvertures dans les plaques, de choisir le débit désiré et/ou de disperser sélectivement le sable sur le modèle.
EP84904050A 1984-10-30 1984-10-30 Dispositif distributeur de sable pour fonderie Expired - Lifetime EP0199719B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US1984/001738 WO1986002582A1 (fr) 1984-10-30 1984-10-30 Dispositif distributeur de sable pour fonderie

Publications (3)

Publication Number Publication Date
EP0199719A1 true EP0199719A1 (fr) 1986-11-05
EP0199719A4 EP0199719A4 (fr) 1988-08-29
EP0199719B1 EP0199719B1 (fr) 1990-11-28

Family

ID=22182311

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84904050A Expired - Lifetime EP0199719B1 (fr) 1984-10-30 1984-10-30 Dispositif distributeur de sable pour fonderie

Country Status (4)

Country Link
EP (1) EP0199719B1 (fr)
JP (1) JPS62500990A (fr)
DE (1) DE3483693D1 (fr)
WO (1) WO1986002582A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4784206A (en) * 1987-12-03 1988-11-15 Combustion Engineering, Inc. Sand vibration and compaction apparatus and method
US4860816A (en) * 1988-09-15 1989-08-29 General Kinematics Corporation Control system for vibratory apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1049962A (fr) * 1951-02-09 1954-01-04 Fischer Ag Georg Procédé et appareil pour assurer l'écoulement régulier de matières pulvérulentes ou granuleuses à partir de trémies de chargement, notamment dans les machines à souffler et mouler à noyaux
US2759229A (en) * 1951-11-29 1956-08-21 Pettibone Mulliken Corp Control mechanism for core blowers
US2761186A (en) * 1952-04-24 1956-09-04 Edwin F Peterson Blow tube for core blowing machine

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2636230A (en) * 1950-05-20 1953-04-28 Key Company Blow plate for core blowing machines
US2789325A (en) * 1953-03-05 1957-04-23 Dodge Steel Company Core blowing apparatus
US3170202A (en) * 1962-08-22 1965-02-23 Sr William J Huston Foundry process
US3446265A (en) * 1966-05-17 1969-05-27 Eaton Yale & Towne Process for making permanently backed shell molds
GB1460562A (en) * 1974-02-01 1977-01-06 Jacob H Regenerating particulate mould materials

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1049962A (fr) * 1951-02-09 1954-01-04 Fischer Ag Georg Procédé et appareil pour assurer l'écoulement régulier de matières pulvérulentes ou granuleuses à partir de trémies de chargement, notamment dans les machines à souffler et mouler à noyaux
US2759229A (en) * 1951-11-29 1956-08-21 Pettibone Mulliken Corp Control mechanism for core blowers
US2761186A (en) * 1952-04-24 1956-09-04 Edwin F Peterson Blow tube for core blowing machine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO8602582A1 *

Also Published As

Publication number Publication date
WO1986002582A1 (fr) 1986-05-09
EP0199719A4 (fr) 1988-08-29
JPS62500990A (ja) 1987-04-23
DE3483693D1 (de) 1991-01-10
EP0199719B1 (fr) 1990-11-28
JPH0581343B2 (fr) 1993-11-12

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