US1817245A - Coating for metal casting molds and cores - Google Patents

Coating for metal casting molds and cores Download PDF

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Publication number
US1817245A
US1817245A US451522A US45152230A US1817245A US 1817245 A US1817245 A US 1817245A US 451522 A US451522 A US 451522A US 45152230 A US45152230 A US 45152230A US 1817245 A US1817245 A US 1817245A
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US
United States
Prior art keywords
coating
cores
binder
molds
aluminum silicate
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
US451522A
Inventor
Meyer L Freed
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.)
HENRY A GOLWYNNE
Original Assignee
HENRY A GOLWYNNE
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 HENRY A GOLWYNNE filed Critical HENRY A GOLWYNNE
Priority to US451522A priority Critical patent/US1817245A/en
Application granted granted Critical
Publication of US1817245A publication Critical patent/US1817245A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns

Definitions

  • My invention relates to improvements in coatings for the molds and cores used in pouring metal castings, and the object of the invention is to produce a coating which will enable the production of a smoother casting requiring less cleaning, and one which will be easily removed from the mold.
  • a further object is to devise a coating which is non-spalling and Which Will retain its bond at Very high temperatures forming a glaze for the surface of the mold or core and which will resist cutting away, also preventing fusion and penetration.
  • My composition consists of a mixture of a permanent binder with an anhydrous aluminum silicate (Al SiO such as sillimanite, andalusite, cyanite, topaz, dumortierite or any other anhydrous aluminum silicate which upon calcination forms mullite (3Al O 2SiO or mullite itself derived from the calcination of any of the above mentioned minerals, or produced synthetically.
  • Al SiO anhydrous aluminum silicate
  • mullite Al O 2SiO or mullite itself derived from the calcination of any of the above mentioned minerals, or produced synthetically.
  • a paste is thus produced which can be diluted to the required coi'isistency for application to the surface of the cores and molds by either sWabbing, dipping, brushing or spraying.
  • the coating or wash after'being applied to the surface of the cores and molds is baked whereby such coating presents a hard surface.
  • This hard surface prevents the cutting of sand at the gates with consequent Washing of sand into the casting.
  • anhydrous aluminum silicate or mullite in the mixture is highly important. Being an exceedinglyrefractory substance with a fusion point of 3300 F. it has the property of making the protective coating resist the heat of the molten metal and prevents fusion of the metal with the sand. lVhcn molten iron or steel comes into contact with the anhydrous aluminum silicate or mullite it forms a compound that to becomes a glaze upon the surface of the Application filed "May -10, 1930. Serial No. 451,522.
  • the coating as described is particularly helpful in casting heavy metal sections or Where there is long exposure of the mold and cores to the metal during pouring.
  • a coating for cores and molds used in casting metals consisting of anhydrous aluminum silicate and a binder.
  • a coating for cores and molds used in casting metals consisting of calcined an hydrous aluminum silicate and a binder.
  • a coating for cores and molds used in casting metals consisting of mullite and a binder.
  • a coating for cores and molds used in casting metals consisting of anhydrous aluminum silicate, a temporary binder and a permanent binder.
  • a coating for cores and molds used in casting metals consisting of calcined an- 30 hydrous aluminum silicate, a temporary binder and a permanent binder.
  • a coating for cores and molds used in casting metals consisting of mullite, a temporary binder and a permanent binder.
  • a coating for cores and molds used in casting metals consisting of anhydrous aluminum silicate, a binder and an organic oil.
  • a coating for cores and molds used in casting metals consisting of calcined anhydrous aluminum silicate, a binder and an organic oil.
  • a coating for cores and molds used in casting metals consistingpf mullite, a binder and an organic oil.
  • a coating for cores and molds used in casting metals consisting of anhydrous aluminum sllicate, a binder and graphite.
  • a coating for cores and molds used in casting metals consisting of calcined anhydrous aluminum silicate, a binder and graphite.
  • a coating for cores and molds used in casting metals consisting of mullite, a

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mold Materials And Core Materials (AREA)

Description

Patented Aug. 4, 1931 UNITED STATES PATENT OFFICE MEYER L. BREED, OF NEW YORK, N. Y., ASSIGNOR TO HENRY A. GOLWYNNE, OF NEW YORK, N. Y.
COATING FOR METAL CASTING MOLDS AND CORES No Drawing.
My invention relates to improvements in coatings for the molds and cores used in pouring metal castings, and the object of the invention is to produce a coating which will enable the production of a smoother casting requiring less cleaning, and one which will be easily removed from the mold.
A further object is to devise a coating which is non-spalling and Which Will retain its bond at Very high temperatures forming a glaze for the surface of the mold or core and which will resist cutting away, also preventing fusion and penetration.
My composition consists of a mixture of a permanent binder with an anhydrous aluminum silicate (Al SiO such as sillimanite, andalusite, cyanite, topaz, dumortierite or any other anhydrous aluminum silicate which upon calcination forms mullite (3Al O 2SiO or mullite itself derived from the calcination of any of the above mentioned minerals, or produced synthetically.
I make a suspension 'of the binder and,
add thereto a small percentage of an organic oil as a temporary binder and then add the anhydrous aluminum silicate or mullite in very fine form. A paste is thus produced which can be diluted to the required coi'isistency for application to the surface of the cores and molds by either sWabbing, dipping, brushing or spraying.
The coating or wash after'being applied to the surface of the cores and molds is baked whereby such coating presents a hard surface. This hard surface prevents the cutting of sand at the gates with consequent Washing of sand into the casting.
The presence of the anhydrous aluminum silicate or mullite in the mixture is highly important. Being an exceedinglyrefractory substance with a fusion point of 3300 F. it has the property of making the protective coating resist the heat of the molten metal and prevents fusion of the metal with the sand. lVhcn molten iron or steel comes into contact with the anhydrous aluminum silicate or mullite it forms a compound that to becomes a glaze upon the surface of the Application filed "May -10, 1930. Serial No. 451,522.
mold. This glaze prevents spalling, fusion, erosion and penetration and produces smoother castings that have a better peal and shiny surfaces. It is also beneficial to add a percentage of graphite to the mix.
The coating as described is particularly helpful in casting heavy metal sections or Where there is long exposure of the mold and cores to the metal during pouring.
Although I have described my invention as particularly applicable to sand molds and cores, the coating can with equal facility be applied to permanent molds such as those constructed of metal.
W hat I claim as my invention is: 65
1. A coating for cores and molds used in casting metals consisting of anhydrous aluminum silicate and a binder.
2. A coating for cores and molds used in casting metals consisting of calcined an hydrous aluminum silicate and a binder.
3. A coating for cores and molds used in casting metals consisting of mullite and a binder.
4. A coating for cores and molds used in casting metals consisting of anhydrous aluminum silicate, a temporary binder and a permanent binder.
5. A coating for cores and molds used in casting metals consisting of calcined an- 30 hydrous aluminum silicate, a temporary binder and a permanent binder.
6. A coating for cores and molds used in casting metals consisting of mullite, a temporary binder and a permanent binder.
7. A coating for cores and molds used in casting metals consisting of anhydrous aluminum silicate, a binder and an organic oil.
8. A coating for cores and molds used in casting metals consisting of calcined anhydrous aluminum silicate, a binder and an organic oil.
9. A coating for cores and molds used in casting metals consistingpf mullite, a binder and an organic oil.
10. A coating for cores and molds used in casting metals consisting of anhydrous aluminum sllicate, a binder and graphite.
11. A coating for cores and molds used in casting metals consisting of calcined anhydrous aluminum silicate, a binder and graphite. I
12. A coating for cores and molds used in casting metals consisting of mullite, a
binder and graphite.
MEYER L. FREED.
US451522A 1930-05-10 1930-05-10 Coating for metal casting molds and cores Expired - Lifetime US1817245A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US451522A US1817245A (en) 1930-05-10 1930-05-10 Coating for metal casting molds and cores

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US451522A US1817245A (en) 1930-05-10 1930-05-10 Coating for metal casting molds and cores

Publications (1)

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US1817245A true US1817245A (en) 1931-08-04

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558411A (en) * 1945-05-22 1951-06-26 Battelle Development Corp Ceramic coating composition, coated article, and method of making same
US2631344A (en) * 1950-10-14 1953-03-17 Union Carbide & Carbon Corp Method of casting metal ingots
EP0420781A2 (en) * 1989-09-08 1991-04-03 Bostlan, S.A. Refractory paint for covering foundry moulds
US5094692A (en) * 1989-05-22 1992-03-10 Vesuvius Crucible Company Gas impermeable coating for a refractory article

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2558411A (en) * 1945-05-22 1951-06-26 Battelle Development Corp Ceramic coating composition, coated article, and method of making same
US2631344A (en) * 1950-10-14 1953-03-17 Union Carbide & Carbon Corp Method of casting metal ingots
US5094692A (en) * 1989-05-22 1992-03-10 Vesuvius Crucible Company Gas impermeable coating for a refractory article
EP0420781A2 (en) * 1989-09-08 1991-04-03 Bostlan, S.A. Refractory paint for covering foundry moulds
EP0420781A3 (en) * 1989-09-08 1992-09-02 Bostlan, S.A. Refractory paint for covering foundry moulds

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