US1776686A - Molding sand - Google Patents

Molding sand Download PDF

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Publication number
US1776686A
US1776686A US329204A US32920428A US1776686A US 1776686 A US1776686 A US 1776686A US 329204 A US329204 A US 329204A US 32920428 A US32920428 A US 32920428A US 1776686 A US1776686 A US 1776686A
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US
United States
Prior art keywords
sand
molding sand
tar
cast
mold
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
US329204A
Inventor
Mathieu Leon Louis
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.)
Pont a Mousson SA
Original Assignee
Founderies de Pont a Mousson SA
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
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Publication of US1776686A publication Critical patent/US1776686A/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
    • B22C1/00—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds
    • B22C1/16—Compositions of refractory mould or core materials; Grain structures thereof; Chemical or physical features in the formation or manufacture of moulds characterised by the use of binding agents; Mixtures of binding agents
    • B22C1/167—Mixtures of inorganic and organic binding agents

Definitions

  • This invention relates to a composite sand or molding material especially adapted for use in casting pipes'by the centrifugal meth d and comprising sand together with a certain amount of coal tar, the amount of coal tar being preferably about 1 or 2 per cent by volume.
  • the proportions in the composition may be, for instance, as follows:
  • Thecomposite sand or molding material 85 answers the above requirements. It possesses a eat cohesion and provides for casting oper tions without preliminary drying and without any'preliminary coating of an expensive nature.
  • a molding material comprising the follow ing substances:

Description

' Patented Sept..23, 1930 UNITED STATES PATENT oFmcE III-EON LOUIS MATHIEU, OI RO'UEN, FRANCE, ASSIGNOR TO SOGIETE ANONYME IDES -HAUTS-FOURNEAUX ET FONDERIES DE MEUBTEE-ET-MOSELLE, FRANCE PONT-A-MOUSSON, OF PONT-A-MOUSSON,
MOLDING SAND Ho Drawing. Applicationflled December 29, 1928, Serial No. 329,204, and in France April 27, 1928.
This invention relates to a composite sand or molding material especially adapted for use in casting pipes'by the centrifugal meth d and comprising sand together with a certain amount of coal tar, the amount of coal tar being preferably about 1 or 2 per cent by volume.
The proportions in the composition may be, for instance, as follows:
1o Parts by volume Siliceous sand 40 Old sand Olayey sand 13 15 Goal tar 1 The improved molding material offers great advantages, chiefly when the pipes are cast by the centrifugal process in a sand mold contained in a metal mold made in one piece. In such a case, not only the amount of'sand required should be reduced to a minimum but also the sand should allow the metal to be cast without'an preliminary drying of the a sand. The san must also be used without any coating adapted to prevent its adhesion to the cast metal, and the pipe should be readily removable from ,the mold after the v casting. This latter operation is made more so difiicult due to the fact that the pipe usually has a raised edge or annular bead which tends to prevent the removal of the cast pipe from 'the mold.
' Thecomposite sand or molding material 85 according to the invention answers the above requirements. It possesses a eat cohesion and provides for casting oper tions without preliminary drying and without any'preliminary coating of an expensive nature.
40 Duringthe casting operation, there is prowill depend upon the dimensions of the pipes or like pieces to be cast.
Having now described my invention what I claim as new and desire to secure by Letters Patent is:
A molding material comprising the follow ing substances:
Parts by volume siliceous sand About 40 Old sand "5;-" About 20 Olayey sand About 13 Goal tar -About 1 In testimony whereof -I have signed my name to this specification.
LEON LOUIS MATHIEU.
duced a distillation of the tar, thus automatically covering the mold with a layer rotect- .ing it against the cast metal. After t ecasting, the tar is burnt away, whereby the sand is disaggregated, so that it will not materially oppose the discharge of the pipe-and the exit of its said raised edge.
Obviously, the above mentioned composi tion of the sand is example. The proportion of tar employed given solely by way of
US329204A 1928-04-27 1928-12-29 Molding sand Expired - Lifetime US1776686A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1776686X 1928-04-27

Publications (1)

Publication Number Publication Date
US1776686A true US1776686A (en) 1930-09-23

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ID=9680967

Family Applications (1)

Application Number Title Priority Date Filing Date
US329204A Expired - Lifetime US1776686A (en) 1928-04-27 1928-12-29 Molding sand

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