US3747665A - Sand-blowing machine - Google Patents

Sand-blowing machine Download PDF

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Publication number
US3747665A
US3747665A US00151753A US3747665DA US3747665A US 3747665 A US3747665 A US 3747665A US 00151753 A US00151753 A US 00151753A US 3747665D A US3747665D A US 3747665DA US 3747665 A US3747665 A US 3747665A
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US
United States
Prior art keywords
sand
spiral
sleeve
blowing machine
crosspiece
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 - Lifetime
Application number
US00151753A
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English (en)
Inventor
G Taburinsky
P Kholodenko
K Lisitsyn
N Novozhilov
N Sverdlik
B Kinyaev
L Krichevsky
V Poplavsky
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Individual
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Individual
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 Individual filed Critical Individual
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Publication of US3747665A publication Critical patent/US3747665A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles
    • B22C15/245—Blowing tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C15/00—Moulding machines characterised by the compacting mechanism; Accessories therefor
    • B22C15/23—Compacting by gas pressure or vacuum
    • B22C15/24—Compacting by gas pressure or vacuum involving blowing devices in which the mould material is supplied in the form of loose particles

Definitions

  • ABSTRACT A sand-blowing machine having a sleevein the form of a shell made as a helical spiral with a corrugated surface, the coils of the spiral being in contact with each other over the corrugated surface and forming at the places of contact openings adapted for the passage of an.
  • the present invention relates to the field of foundry practice and, more particularly, it relates to sandblowing machines designed for the manufacture of cores and moulds.
  • sand-blowing machines comprising a crosspiece which includes a working container with a corrugated sleeve and inlet and exhaust valves, said crosspiece being rigidly connected to a bedplate accommodating a pressure table.
  • the crosspiece supports means adapted for charging the sand to l the container and having a hopper for the sand and a gate-valve mechanism to close the working container, as well as a nozzle adapted for the supply and distribution of the sand in a core box or mould.
  • Core or moulding sand is charged inside the sleeve of the working container from the charging hopper with the gate valve open.
  • the gate valve is closed and the table urges the core box against the nozzle, whereupon one or several inlet valves are open through which air is supplied to the working container and from the latter, via openings in the shell, to the inside of the sleeve.
  • the sand is supplied through the nozzle to the core box or mould and packed there.
  • the exhaust valve is opened through which spent air is discharged into atmosphere, after which the pressure table with the core box is lowered and a core removed from the box.
  • the openings in the shell for the passage of compressed air inside the sleeve are made as milled slots about 0.4 mm wide.
  • Such sleeves require much labor in their manufacture (for example, in a sleeve having a capacity of 100 liters slots are to be milled whose total length exceeds 100 m) and the sleeves are short-lived due to the fact that air exhausted through the slots in the sleeve carries therewith rather large particles of sand causing abrasion wear of the slots.
  • the clearances between the coils of the spiral serve for the supply of air inside the sleeve.
  • the size of the clearances can be adjusted by compressing or stretching the spiral.
  • This known sand-blowing machine is disadvantageous in that it is impossible to obtain uniform and adequately small clearances between the coils of the spiral, which results in a spontaneous uncontrolled distribution of air supplied to the sleeve and interruption of the process of the sand discharge from the container.
  • a sand-blowing machine for the manufacture of cores and moulds, disclosed herein and comprising a bedplate with a pressure table, which bedplate is rigidly connected to a crosspiece accommodating means for charging the sand and a nozzle through which the sand is fed to a moulding flask or core box, the crosspiece supporting thereinside a working container and valves adapted for the inlet of compressed air into and exhaust of spent air out of the container, said working container comprising a sleeve which has a shell made as a helical spiral between whose coils openings are provided for the passage of air from the container to the sleeve.
  • the spiral of the sleeve has a corrugated surface, while its coils are in contact with each other over said corrugated surface so as to form between the places of contact the openings for the passage of air.
  • one of the contacting surfaces of the spiral be made corrugated.
  • the spiral be manufactured from hollow material in order to maintain the required temperature of the sand in the sleeve.
  • FIG. 1 illustrates the sand-blowing machine in accordance with the present invention, in partial longitudinal section
  • FIG. 2 is a longitudinal sectional view of the sleeve for the working container of the sand-blowing machine according to the present invention, manufactured from solid profile material;
  • FIG. 3 is a section taken on line III-III of FIG. 2;
  • FIG. 4 is a section taken on line IV-I of FIG. 3;
  • FIG. 5 is a longitudinal sectional view of the sleeve for the working container of the sand-blowing machine according to the present invention, manufactured from hollow material;
  • FIG. 6 is a section taken on line VI--VI of FIG. 5.
  • the sand-blasting machine has a bedplate l with a pressure table 2, and connected to the bedplate via column 3 is a crosspiece 4.
  • a working container 5 Accommodated inside the crosspiece is a working container 5 which houses a sleeve 6 and inlet valves 7 and exhaust valves 8.
  • a nozzle 9 At the lower portion of the container is secured a nozzle 9, and on the upper portion of the crosspiece is mounted a vibrating hopper 10 for charging sand, and a gate-valve mechanism 11 for opening the throat of the working container when the sand is being charged and for closing said throat when the air inlet valve 7 is opened.
  • a core box 12 (or a moulding flask) is placed onto the pressure table of the bedplate.
  • the spiral material has acorrugated surface.
  • the sleeve is mounted in upper flange l4 and lower flange 15, said serving for setting and .securing the sleeve in the working container of the machine.
  • Several tie pieces 16 are utilized to prevent the coils of the spiral from coming apart and to impart rigidity to the sleeve.
  • the tie pieces and flanges are connected to the shell by means of welding or in some other suitable manner.
  • the surface of the spiral material is made corrugated for example, by knurling.
  • recesses 17 in the corrugated surface may have a required depth and spacing (pitch) in different portions of the shell in accordance with requirements placed upon the sleeve.
  • the coils of the spiral shell are made to be in tightly fitting relation to each other so that the openings 17 adapted for the passage of air into the sleeve are formed at the joint of the coils owing to the recesses in one of the contacting surfaces of the spiral 13.
  • the shell of the sleeve is formed from hollow material (cf., FIGS. 5 and 6) and coolant is pumped therethrough to heat or cool the sleeve and, consequently, the sand at the same time.
  • coolant For the supply of coolant to the spiral shell of the sleeve, use is made of flanges 18 and 19 hermetically connected with the shell and provided with conduits 20 and 21 for the supply and removal of coolant.
  • the sand-blowing machines of the invention provided with sleeves having spiral shells are efficient and the quality of the cores produced are equal, and even superior, to those of the machines employing conventional sleeves with slit openings in the shells. It has also been found that no accumulation or hanging of the core sand can be observed on the inner surface of the sleeve between the coils of the spiral.
  • a sand-blowing machine for the manufacture of cores and moulds, comprising: a bedplate with a pressure table; a crosspiece rigidly connected to said bedplate, means on said crosspiece for charging sand and a nozzle on said crosspiece through which the sand is fed to a moulding flask or core box, said crosspiece having thereinside a working container and valves adapted for the inlet of compressed air into and exhaust of spent air out of the container; said working container comprising a sleeve which has a shell constituted as a helical spiral of material having a corrugated surface, the coils of said spiral being in contact with each over said corrugated surface so as to form between the places of contact openings for the passage of air.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Casting Devices For Molds (AREA)
  • Mold Materials And Core Materials (AREA)
US00151753A 1971-06-04 1971-06-10 Sand-blowing machine Expired - Lifetime US3747665A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE2127822A DE2127822C3 (de) 1971-06-04 1971-06-04 Schießzylinder für eine Gießerei-Schießmaschine zum Fertigen von Kernen und Formen
US15175371A 1971-06-10 1971-06-10
FR7121889A FR2141570B1 (OSRAM) 1971-06-04 1971-06-16
GB28638/71A GB1299058A (en) 1971-06-04 1971-06-18 A sand-shooting machine

Publications (1)

Publication Number Publication Date
US3747665A true US3747665A (en) 1973-07-24

Family

ID=27431262

Family Applications (1)

Application Number Title Priority Date Filing Date
US00151753A Expired - Lifetime US3747665A (en) 1971-06-04 1971-06-10 Sand-blowing machine

Country Status (4)

Country Link
US (1) US3747665A (OSRAM)
DE (1) DE2127822C3 (OSRAM)
FR (1) FR2141570B1 (OSRAM)
GB (1) GB1299058A (OSRAM)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5038845A (en) * 1990-08-31 1991-08-13 Roberts Sinto Corporation Blow tube arrangement for core and mold making machinery

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2839798A (en) * 1954-02-17 1958-06-24 Archer Daniels Midland Co Core blowing apparatus
US2861301A (en) * 1953-12-05 1958-11-25 Fischer Ag Georg Sand blast molding machine
US2928147A (en) * 1955-12-23 1960-03-15 Hansberg Fritz Agitatorless foundry shooting device
US3328852A (en) * 1964-10-16 1967-07-04 Osborn Mfg Co Foundry sand forming machines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2861301A (en) * 1953-12-05 1958-11-25 Fischer Ag Georg Sand blast molding machine
US2839798A (en) * 1954-02-17 1958-06-24 Archer Daniels Midland Co Core blowing apparatus
US2928147A (en) * 1955-12-23 1960-03-15 Hansberg Fritz Agitatorless foundry shooting device
US3328852A (en) * 1964-10-16 1967-07-04 Osborn Mfg Co Foundry sand forming machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5038845A (en) * 1990-08-31 1991-08-13 Roberts Sinto Corporation Blow tube arrangement for core and mold making machinery

Also Published As

Publication number Publication date
GB1299058A (en) 1972-12-06
FR2141570A1 (OSRAM) 1973-01-26
DE2127822C3 (de) 1974-03-07
FR2141570B1 (OSRAM) 1974-03-22
DE2127822A1 (de) 1973-03-22
DE2127822B2 (de) 1973-07-26

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