US1320770A - Process for making molds for casting - Google Patents
Process for making molds for casting Download PDFInfo
- Publication number
- US1320770A US1320770A US1320770DA US1320770A US 1320770 A US1320770 A US 1320770A US 1320770D A US1320770D A US 1320770DA US 1320770 A US1320770 A US 1320770A
- Authority
- US
- United States
- Prior art keywords
- mold
- casting
- mold material
- air
- pattern
- 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
- 238000000034 method Methods 0.000 title description 22
- 238000005266 casting Methods 0.000 title description 8
- 239000000463 material Substances 0.000 description 36
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 238000005755 formation reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006011 modification reaction Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- -1 semi-Huid Substances 0.000 description 2
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/03—Sand moulds or like moulds for shaped castings formed by vacuum-sealed moulding
-
- 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
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S164/00—Metal founding
- Y10S164/04—Dental
Definitions
- the object of my invention is to provide a simple. reliable, and thoroughly practical method for quickly, completely, and properly coating with a fluid, semi-Huid, or plastic mold material the interior and exterior surfaces of the most complex and intricate pattern. I attain this object, and thus economically and unfailingly obviate the usual diiiiculties with air bubbles, by placing upon a suitable mounting one or more patterns in an air-tight vessel, from which the air is subsequently exhausted so as to produce a vacuum, during the maintenance of which the mold material is allowed to flow intothe vessel.
- FIG. 1 illustrates by vertical sections two forms of apparatus for use in practising the present invention
- Figure l showing a form in which the funnel capacity determines the quantity of mold material that enters the flask and when the air seal is broken
- Fig. 2 showing a form in which the capacity of the funnel is sufficient for charging a plurality of molds, and in which the supply of mold material to the flask, as well as the breaking of the vacuum, is controlled by the valve.
- FIGs. 1 and 2 the method of applying my invention is illustrated in Figs. 1 and 2, in which A is a iiask within which the patterns 6, b, b, are mounted upon a suitable base.
- B is a vacuum bell or similar suitable vessel mounted upon the plate C, through -which passes the pipe d leading to a vacuum pump, the contacts betweeubell B and plate C being suiiciently intimate, or a suitable sealing means being provided to prevent leakage ofair to the bell.
- D is a unnel having its stem e extended into the bell B and filled to the line f With a quanp tity of mold material sufficient to cover the patterns b, b, b in the flask A to the level g, but adapted to control the delivery of the mold material into the ask A by the stopcock h. If, now, the air be exhausted through the pipe d, the stopcock i be closed, and the stopcock It be opened, the mold material in funnel D Will flow into flask A, and air will be immediately admitted after the charge to relieve the vacuum in bell B, either automatically as in Fig. 1, or by turning the three-Way valve to the venting posiof July, 1919.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
Description
V. LOUGHIED.
PROCESS FOR MAKING MOLDS FOR CASTING. APPLICATION FILED Aucms, 1919.
l QVUO Patented Nov. 4, 1919.
UNITED STATES PATENT @FFIE VICTOR LOUGI-IEED, OF SAN FRANCISCO, CALIFORNIA, ASSIGNOR TO :ENTERPRISE` Y FOUNDRY COMPANY, OF SAN FRANCISCO, CALIFORNIA., A CORPORATION 0F CALIFORNIA.
' PROCESS FOR MAKING lVIO'LDS FOR CASTING.
Specification of Letters Patent.
' Application led August 18. 1919. Serial No. 318,205.
To all whom, t may concern.'
Be. it known that I, VICTOR LoUeHnED, a citizen of the United States, residing at San Francisco, in the county of San Francisco and State of California, have invented a new and useful Process of Making Molds for Casting; and I do hereby declare the follofy'ving to be a fullclear, and exact description of my invention, such as will enable-' others skilled in the art to which it appertains to make and use the same.
With the type of molds which have been used for many years for the production of dental inlays, vases, ornaments, etc., and an essential feature of which consists in setting the; mold material around a wax or other pattern, which is easily melted or destroyed by heat, there are certain practical diiiiculties in pouring or applying the mold material so as to avoid air bubbles upon the patterns, the presence of which is seriously objectionable 1n that they constitute unintended extensions` of the mold cavity, which result in corresponding blemishes and imperfections in the castings subsequently made therein.
The common practice in the technique of making dental inlays, vases, and the like, by the 'cem perduta process is to paint carefully with a small, soft brush an initial coating of the mold or investment material over each pattern before completing the niold by adding the entire quantity of mold material. This procedure has been made to serve satisfactorily in cases where the forms were simple or the expense immaterial; but because ofthe time that it consumes, and because of the practical impossibility of coating thoroughly the interior details of deep recesses and cavities, it is not practicable for the production, upon a commercial scale, of castings for machine parts. l
The object of my invention is to provide a simple. reliable, and thoroughly practical method for quickly, completely, and properly coating with a fluid, semi-Huid, or plastic mold material the interior and exterior surfaces of the most complex and intricate pattern. I attain this object, and thus economically and unfailingly obviate the usual diiiiculties with air bubbles, by placing upon a suitable mounting one or more patterns in an air-tight vessel, from which the air is subsequently exhausted so as to produce a vacuum, during the maintenance of which the mold material is allowed to flow intothe vessel.
In my experience I have found it unnecessary to go to extreme lengths in the way of securing very high vacua, a relatively low vacuum or small exhaustion of air being found suilicient in any given case to prevent the formation of air bubbles of objectionable or apparent size. Also, I have found that the most practical way to proceed is to measure approximately the exact quantity of mold material necessary to cover the pattern or patterns in the vessel to the depth required, and then to let the inflow of the iinal portion of this quantity of mold material automatically open the vessel to the atmosphere, and so relieve the vacuum immediately upon the completion of the pouring of the mold. It is obvious, however, that an indenitely large supply of mold material might "be used, and, after a measured portion thereof has been admitted to the vessel, further supply shut oi, and air thereby promptly admitted. Hence, I do not confine myself to any particular details of the procedure, but may follow any one of a number of possible modifications of the general scheme so long as the essential feature is maintained of admitting air and relieving the vacuum with sulticient promptness after thefmoldis poured to prevent the liquid portion of the mold material from vaporizing and giving up dissolved gases under the reduced pressure, and producing the very condition that it is sought to avoid.
The accompanying drawings illustrate by vertical sections two forms of apparatus for use in practising the present invention, Figure l showing a form in which the funnel capacity determines the quantity of mold material that enters the flask and when the air seal is broken; and Fig. 2 showing a form in which the capacity of the funnel is sufficient for charging a plurality of molds, and in which the supply of mold material to the flask, as well as the breaking of the vacuum, is controlled by the valve.
In its preferred form, the method of applying my invention is illustrated in Figs. 1 and 2, in which A is a iiask within which the patterns 6, b, b, are mounted upon a suitable base. B is a vacuum bell or similar suitable vessel mounted upon the plate C, through -which passes the pipe d leading to a vacuum pump, the contacts betweeubell B and plate C being suiiciently intimate, or a suitable sealing means being provided to prevent leakage ofair to the bell. D is a unnel having its stem e extended into the bell B and filled to the line f With a quanp tity of mold material sufficient to cover the patterns b, b, b in the flask A to the level g, but adapted to control the delivery of the mold material into the ask A by the stopcock h. If, now, the air be exhausted through the pipe d, the stopcock i be closed, and the stopcock It be opened, the mold material in funnel D Will flow into flask A, and air will be immediately admitted after the charge to relieve the vacuum in bell B, either automatically as in Fig. 1, or by turning the three-Way valve to the venting posiof July, 1919.
tion as in Fig. 2. Thus, the condition hereinbefore specified Will have been realized.
I claim:
1. The process of forming molds, Which consists in applying the `mold-forming material to a pattern While in a sub-atmospheric environment.
2. The process of forming molds, which consists in introducing a pattern into an inclosure, reducing the pressure Within the inclosure,to below atmosphere, and delivering the mold-.forming material to the pattern by the suction resulting from such reduction 1n pressure.
3. The improvement in the process 'of molding a mold, Which consists in applying the mold-forming material to the pattern n vacuo.
Signed at Chicago, Illinois, this th day VICTOR LOUGHEED.
Publications (1)
Publication Number | Publication Date |
---|---|
US1320770A true US1320770A (en) | 1919-11-04 |
Family
ID=3388237
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US1320770D Expired - Lifetime US1320770A (en) | Process for making molds for casting |
Country Status (1)
Country | Link |
---|---|
US (1) | US1320770A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2482257A (en) * | 1944-11-09 | 1949-09-20 | Jr John Frei | Investing method |
US2490193A (en) * | 1947-08-15 | 1949-12-06 | Roy E Barr | Method of molding |
US2933785A (en) * | 1956-03-23 | 1960-04-26 | Hansberg Fritz | Process and devices for the production of blanks, cores, and moulds for casting purposes |
US3305901A (en) * | 1963-06-12 | 1967-02-28 | Gero Metallurg Corp | Vacuum casting method of multiple ingot casting |
US3341432A (en) * | 1963-03-14 | 1967-09-12 | Int Standard Electric Corp | Method of making wave guides |
-
0
- US US1320770D patent/US1320770A/en not_active Expired - Lifetime
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2482257A (en) * | 1944-11-09 | 1949-09-20 | Jr John Frei | Investing method |
US2490193A (en) * | 1947-08-15 | 1949-12-06 | Roy E Barr | Method of molding |
US2933785A (en) * | 1956-03-23 | 1960-04-26 | Hansberg Fritz | Process and devices for the production of blanks, cores, and moulds for casting purposes |
US3341432A (en) * | 1963-03-14 | 1967-09-12 | Int Standard Electric Corp | Method of making wave guides |
US3305901A (en) * | 1963-06-12 | 1967-02-28 | Gero Metallurg Corp | Vacuum casting method of multiple ingot casting |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN103920852B (en) | A kind of precision casting process of large foundry goods | |
US3557867A (en) | Casting apparatus | |
CN103586412B (en) | Method for casting ledges of middle troughs of scraper conveyer by V (vacuum) method | |
CN104588581A (en) | Manufacturing method of brake drum | |
US1320770A (en) | Process for making molds for casting | |
US2124871A (en) | Method and apparatus for molding articles | |
CN110405145A (en) | Dispellable mould casting slow cooling sandbox | |
CN108067606A (en) | It is a kind of using the sand mold frock of paraffin model and casting production method | |
US2877523A (en) | Vacuum casting | |
CN106238675A (en) | A kind of technique improving yield of lost foam casting of engine cylinder block | |
GB1440853A (en) | Hollow sand core moulding device | |
CN106694805A (en) | Process for increasing evanescent mode casting engine cylinder yield | |
JPS6111140B2 (en) | ||
GB1473462A (en) | Sand blowing head | |
SU1122399A1 (en) | Method of manufacturing casting mould by vacuum moulding and device for effecting same | |
GB122133A (en) | Apparatus for Making Metal Castings. | |
US1699592A (en) | Process of casting metal | |
CN207982284U (en) | A kind of sand mold tooling using paraffin model | |
CN106825405B (en) | A kind of vertical pouring structure for producing well lid in batches | |
US2092832A (en) | Method of making molds | |
SU221908A1 (en) | Method of manufacturing double-layer casting moulds | |
SU682319A1 (en) | Apparatus for pouring moulds in vacuum for investment casting | |
GB1115345A (en) | Method of and apparatus for the production of a body from a slip in a porous mould | |
US1754469A (en) | Filling mold | |
JPS57124546A (en) | Supplying device for molding sand |