US2144532A - Manufacture of foundry molds - Google Patents
Manufacture of foundry molds Download PDFInfo
- Publication number
- US2144532A US2144532A US190323A US19032338A US2144532A US 2144532 A US2144532 A US 2144532A US 190323 A US190323 A US 190323A US 19032338 A US19032338 A US 19032338A US 2144532 A US2144532 A US 2144532A
- Authority
- US
- United States
- Prior art keywords
- mold
- cement
- manufacture
- foundry molds
- sand
- 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
Links
- 238000004519 manufacturing process Methods 0.000 title description 2
- 239000004568 cement Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- RXKJFZQQPQGTFL-UHFFFAOYSA-N dihydroxyacetone Chemical compound OCC(=O)CO RXKJFZQQPQGTFL-UHFFFAOYSA-N 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
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
- B22C1/165—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 in the manufacture of multilayered shell moulds
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249967—Inorganic matrix in void-containing component
- Y10T428/24997—Of metal-containing material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
- Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
Definitions
- This mixture can employed over the entire face 01 the mold cavhemoldedortampedtoiormamold orcoreoi' ltmormaybeemlilor ylt min l where it relatively high porosity and good ltructurai trouble would otherwise be encountered oi the
- the Durand process has gone into molten metal penetra ing into he mold maratherextensiveuseandhasmadeadistinct terial.
- Dimeult is n d o in lude f ing which may cover high temperature; where the casting has reprovide a good bond with the cement-sand mixsand by the metal, forming at the bottom of the ment-sand mold re-entrant angle a porous mass consisting of a
- the mold box is taken on the mold. which is conglomerate of metal and partially fused sand allowed to set as in the reaular Durand process.
- This material is sold me: '1 various trade names. such as the well known The 1118111! fused m md I the tendency to form a glass with the cement. so used the imamfiunu m m which encountered with the #111 with good mum, in pram Wm While a limited amount 01' wateris used to retain eomeporosityintheiacinglayenthennegnin the m M oi.
- the aluminum oxide fines ives a close trained 5 Alumna 1m structure to the facing which resists penetration cementu orthemetalandwhichgivesasmoothlurtaee wlter 7 to the casting whiierpi-e'rertoueethenaeuuimnimnnes While the water contentmsy be somewhatmore from abrasive manufacture, coarser drained aluw thanthatoithetypicalDlu-andmmithprdminsmaybeuseditdedredmithoughitisusuau e0 green or drysand, clnders. or the like.
- the fadng layer consists alumina and may. if desired. contain minor amounts of other sands. but not sufficient however to materially affect the refractory properties of the mixture.
- the material used for a binder is preferably high early strength Portland cement, although ordinary Portland cement or r may be used.
- foundry mold as used in the claims is intended to include cores as well as molds.
- a foundry mold comprising a facing of substantial thickness composed principally of granular refractory aluminum oxide bonded with cement, and a porous backing composed principally of sand and cement integrally united with the facing.
- a foundry mold comprising a facing formed from a moldable but friable mix consisting principally of granular alumina and cement together with an amount of water insufficient to form a dense mixture, and a backing formed from a moldable but friable mixture of sand and cement containing so little water as to form a mass of high porosity.
- a foundry mold having a facing consisting principally of granular refractory alumina bonded with cement.
Description
jlqp'li bliuoo ncrizncliui: wimmm rim Jan. 17, 1939 2,144,532
UNITED STATES PATENT OFFICE wesaitinmtionnlatestothemanuerlbletomeanamountotwatermtially and.more epeoisiiy. lelsthanthatemployedinmahingihemusiceor ulatedthstwhenthecement-sandmixtureis corehoxtotormaiacinglayerotahoutkto emu to %otan*inchthick. 'niisiacinglayermaybe form a highly friable ball. This mixture can employed over the entire face 01 the mold cavhemoldedortampedtoiormamold orcoreoi' ltmormaybeemlilor ylt min l where it relatively high porosity and good ltructurai trouble would otherwise be encountered oi the The Durand process has gone into molten metal penetra ing into he mold maratherextensiveuseandhasmadeadistinct terial. Thetermtacing"lsusedintheclaim improvement in foundry practice. Dimeult is n d o in lude f ing which may cover high temperature; where the casting has reprovide a good bond with the cement-sand mixsand by the metal, forming at the bottom of the ment-sand mold re-entrant angle a porous mass consisting of a The mold box is taken on the mold. which is conglomerate of metal and partially fused sand allowed to set as in the reaular Durand process. 30
which is exceedingly resistant to removal by cutand which is then ready for use. ting. arinding, or chipp ir. This action is ap- Ihe completed mold consists of a porous backparently due to a combination oi physical and log formed oi the relatively dry or "sub-hymust be porous to allow the escape od Bases highly refractory racing, which may be or con- 40 tionotthemetalandtendstoformtheintensely the lacing to separate from the backing. The 40 vantages may be entirely overcome by providing orsteel or other highly heated metal into the 5 of substantial thickness composed or M the regular Durand mix, has the high porosity the lines of the fused alumina employed for mold. n 180 as e Structural i h reabrasive purposes. This material is sold me: '1 various trade names. such as the well known The 1118111! fused m md I the tendency to form a glass with the cement. so used the imamfiunu m m which encountered with the #111 with good mum, in pram Wm While a limited amount 01' wateris used to retain eomeporosityintheiacinglayenthennegnin the m M oi. the aluminum oxide fines :ives a close trained 5 Alumna 1m structure to the facing which resists penetration cementu orthemetalandwhichgivesasmoothlurtaee wlter 7 to the casting whiierpi-e'rertoueethenaeuuimnimnnes While the water contentmsy be somewhatmore from abrasive manufacture, coarser drained aluw thanthatoithetypicalDlu-andmmithprdminsmaybeuseditdedredmithoughitisusuau e0 green or drysand, clnders. or the like.
The fadng layer consists alumina and may. if desired. contain minor amounts of other sands. but not sufficient however to materially affect the refractory properties of the mixture.
The material used for a binder is preferably high early strength Portland cement, although ordinary Portland cement or r may be used The term foundry mold as used in the claims is intended to include cores as well as molds.
While I have described a preferred embodiment of my invention and have described paraucsaa tieularmaterialswhichmaybeutiliseditwillbe thatmyinventlonmaybe practiced or embodiedwithintheseopeoftne of substantial thickness composed principally of nnelydivlded fused m m bondedwith cemen,anda integrallynnitedwiththe facing and composed principally of ordinary sand bonded with cement and having a high porosity.
2. A foundry mold comprising a facing of substantial thickness composed principally of granular refractory aluminum oxide bonded with cement, and a porous backing composed principally of sand and cement integrally united with the facing.
3. A foundry mold comprising a facing formed from a moldable but friable mix consisting principally of granular alumina and cement together with an amount of water insufficient to form a dense mixture, and a backing formed from a moldable but friable mixture of sand and cement containing so little water as to form a mass of high porosity.
4. A foundry mold having a facing consisting principally of granular refractory alumina bonded with cement.
JOHN HOW! HALL.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US190323A US2144532A (en) | 1938-02-12 | 1938-02-12 | Manufacture of foundry molds |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US190323A US2144532A (en) | 1938-02-12 | 1938-02-12 | Manufacture of foundry molds |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US2144532A true US2144532A (en) | 1939-01-17 |
Family
ID=22700868
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US190323A Expired - Lifetime US2144532A (en) | 1938-02-12 | 1938-02-12 | Manufacture of foundry molds |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US2144532A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2491096A (en) * | 1945-08-31 | 1949-12-13 | Austenal Lab Inc | Casting mold |
| DE889687C (en) * | 1943-03-30 | 1953-09-14 | Schiess Ag | Process for the production of casting molds |
| US2840480A (en) * | 1954-08-16 | 1958-06-24 | Stephen D Stoddard | Refractory coating for graphite molds |
| US2857285A (en) * | 1954-08-16 | 1958-10-21 | Stephen D Stoddard | High temperature refractory coating for graphite molds |
| US3126294A (en) * | 1964-03-24 | Mold release material | ||
| US4135030A (en) * | 1977-12-23 | 1979-01-16 | United Technologies Corporation | Tungsten impregnated casting mold |
-
1938
- 1938-02-12 US US190323A patent/US2144532A/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3126294A (en) * | 1964-03-24 | Mold release material | ||
| DE889687C (en) * | 1943-03-30 | 1953-09-14 | Schiess Ag | Process for the production of casting molds |
| US2491096A (en) * | 1945-08-31 | 1949-12-13 | Austenal Lab Inc | Casting mold |
| US2840480A (en) * | 1954-08-16 | 1958-06-24 | Stephen D Stoddard | Refractory coating for graphite molds |
| US2857285A (en) * | 1954-08-16 | 1958-10-21 | Stephen D Stoddard | High temperature refractory coating for graphite molds |
| US4135030A (en) * | 1977-12-23 | 1979-01-16 | United Technologies Corporation | Tungsten impregnated casting mold |
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