US2822592A - Method for making investment molds and castings - Google Patents

Method for making investment molds and castings Download PDF

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US2822592A
US2822592A US412269A US41226954A US2822592A US 2822592 A US2822592 A US 2822592A US 412269 A US412269 A US 412269A US 41226954 A US41226954 A US 41226954A US 2822592 A US2822592 A US 2822592A
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investment
castings
making
base
sprue
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US412269A
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Douglas C Wendt
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Douglas C Wendt
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61CDENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C13/00Dental prostheses; Making same
    • A61C13/20Methods or devices for soldering, casting, moulding or melting

Description

Feb. 11, 1958 D, c. WENDT4 2,822,592

METHOD FOR MAKING INVESTMENT MOLDS AND CASTINGS Filed Feb. 24. 1954 United States Patent METHOD FOR MAKING INVESTMENT MOLDS AND CASTINGS Douglas C. Wendt, Portland, Oreg.

Application February 24, 1954, Serial No. 412,269

1 Claim. (Cl. 22-200) This invention relates generally to the art of making castings and particularly to dental castings and includes a method for making investment molds and castings.

The main object of this invention is to devise a method of and apparatus for making accurate castings of maximum density and free from voids or irregularities not present in the original pattern.

The second object is to devise an apparatus which will fit into the ordinary run of dental equipment and one which can utilize air pressures usually available in dental laboratories.

I accomplish these and other objects in the manner set forth in the following specification as illustrated in the accompanying drawing, in which Fig. 1 is a vertical section through the device.

Fig. 2 is a horizontal section taken along the line 2-2 in Fig. 1.

Fig. 3 is a perspective in section of the mold after wax has been removed by heat.

Fig. 4 is a perspective view of the removable bottom of the mold.

Referring in detail to the drawing, there is shown a base having a threaded top 11 upon which may be mounted a pressure casing 12. The casing 12 is provided with an inlet air valve 13 to which air is supplied through the hose 14 from the laboratory compressor. Either the base 10 or the casing 12 may be stationary and the other element movable. The casing 12 is also provided with a pressure gauge 15 and an exhaust valve 16. Movably placed on the base 10 is a sprue base 17. The sprue base 17 has formed therein a groove in which is seated the investment ring 18.

The wax pattern 19 is normally placed on a sprue 20 made of metal, wax, or plastic and the sprue 20 placed in the sprue base 17. The ring 18, which is lined with asbestos 21, is now placed on the base 17 and freshly mixed casting investment 22 is poured into the ring 18 to completely envelop the pattern 19. The investment 22 is allowed to set and then placed in an oven after the sprue 2 F., depending upon the technique, and allowed to remain there until all the wax is removed and a clean, red hot sprue hole is observed. From here on the casting procedure is as is now customary.

In order to overcome voids and irregularities in the casting, as well as mold distortion, I place the investment ring 18, mounted on the sprue base, and with the pattern 19 in place and the ring filled with soft investment, within the chamber 23 formed by the base 10, and a pressure of forty-five pounds gradually applied to the chamber 23. This pressure is maintained until a trial piece of the soft investment is set. The exhaust valve 16 is opened, the chamber 23 opened, and the ring 18 is ready for the firing.

The resulting casting will be found to be an exact duplicate of the original pattern without voids or distortion of any kind. Due to the pressure employed any air pockets entrapped within the material will be compressed to a point where they disappear or are made so small as to be unobjectionable.

I claim:

In the known method of making dental castings wherein a wax pattern is surrounded with a soft investment material, the investment material thereafter permitted to harden, the wax pattern drained from the interior of the hardened investment material by heating and the cavity left by the wax pattern filled with a molten metal to therebyform a metal dental casting, the improvements which comprise: a. while the investment material surrounding the wax pattern is still in a soft condition, gradually applying an air pressure of approximately 45 pounds per square inch gage directly upon all exposed surfaces of said soft investment material, b. maintaining said air pressure of approximately 45 pounds per square inch gage on said soft investment material while the hardening of the investment material is taking place, c. preventing the circulation of air completely through said investment material while it is in the process of hardening, and a. decreasing the pressure from approximately 45 pounds per square inch gage to atmospheric pressure after said in vestment material has hardened.

References Cited in the file of this patent UNITED STATES PATENTS 593,267 Adams Nov. 9, 1897 1,070,500 Mackenzie Aug. 19, 1913 1,535,017 Cline Apr. 21, 1925 1,834,101 LeMay Dec. 1, 1931 2,017,337 Berryman Oct. 15, 1935 2,507,867 Pomes May 16, 1950 2,606,347 Hildreth Aug. 12, 1952 2,632,215 Lee Mar. 24, 1953 2,652,609 Sudia Sept. 22, 1953 2,715,758 Taccone Aug. 23, 1955

US412269A 1954-02-24 1954-02-24 Method for making investment molds and castings Expired - Lifetime US2822592A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3165799A (en) * 1961-10-17 1965-01-19 Prec Metalsmiths Inc Process and slurry formulation for making precision casting shells
US3404723A (en) * 1966-02-25 1968-10-08 Eugene W. Lewis Method for producing dental molds or molding material
US3610317A (en) * 1969-04-11 1971-10-05 James W Benfield Crucible former
EP0004844A2 (en) * 1978-04-19 1979-10-31 Yamato Kogure Apparatus for manufacturing plastic products
US4834091A (en) * 1987-04-10 1989-05-30 Ott Douglas E Intrauterine fallopian tube ostial plug and surgical process

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US593267A (en) * 1897-11-09 Apparatus for forming sand molds
US1070500A (en) * 1911-05-04 1913-08-19 David Stuart Mackenzie Dental casting apparatus.
US1535017A (en) * 1923-12-14 1925-04-21 Cline Jean Method for investing destructible patterns for inlay fillings
US1834101A (en) * 1930-03-22 1931-12-01 Aurora Metal Company Inc Casting apparatus
US2017337A (en) * 1932-07-02 1935-10-15 Elmer H Berryman Casting furnace
US2507867A (en) * 1947-09-02 1950-05-16 Carlos E Pomes Apparatus for investing under vacuum dental wax patterns or any other type of pattern
US2606347A (en) * 1949-11-25 1952-08-12 Ernest L Hildreth Investing machine
US2632215A (en) * 1953-03-24 Package means for sand molds
US2652609A (en) * 1950-01-17 1953-09-22 Westinghouse Electric Corp Method of making molds
US2715758A (en) * 1952-04-03 1955-08-23 Taccone Pneumatic Foundry Equi Machine for packing sand in a mold box

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US593267A (en) * 1897-11-09 Apparatus for forming sand molds
US2632215A (en) * 1953-03-24 Package means for sand molds
US1070500A (en) * 1911-05-04 1913-08-19 David Stuart Mackenzie Dental casting apparatus.
US1535017A (en) * 1923-12-14 1925-04-21 Cline Jean Method for investing destructible patterns for inlay fillings
US1834101A (en) * 1930-03-22 1931-12-01 Aurora Metal Company Inc Casting apparatus
US2017337A (en) * 1932-07-02 1935-10-15 Elmer H Berryman Casting furnace
US2507867A (en) * 1947-09-02 1950-05-16 Carlos E Pomes Apparatus for investing under vacuum dental wax patterns or any other type of pattern
US2606347A (en) * 1949-11-25 1952-08-12 Ernest L Hildreth Investing machine
US2652609A (en) * 1950-01-17 1953-09-22 Westinghouse Electric Corp Method of making molds
US2715758A (en) * 1952-04-03 1955-08-23 Taccone Pneumatic Foundry Equi Machine for packing sand in a mold box

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3165799A (en) * 1961-10-17 1965-01-19 Prec Metalsmiths Inc Process and slurry formulation for making precision casting shells
US3404723A (en) * 1966-02-25 1968-10-08 Eugene W. Lewis Method for producing dental molds or molding material
US3610317A (en) * 1969-04-11 1971-10-05 James W Benfield Crucible former
EP0004844A2 (en) * 1978-04-19 1979-10-31 Yamato Kogure Apparatus for manufacturing plastic products
EP0004844A3 (en) * 1978-04-19 1979-11-14 Yamato Kogure Method and apparatus for manufacturing plastic products
US4834091A (en) * 1987-04-10 1989-05-30 Ott Douglas E Intrauterine fallopian tube ostial plug and surgical process

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