US2964810A - Method of drying wax models - Google Patents

Method of drying wax models Download PDF

Info

Publication number
US2964810A
US2964810A US730536A US73053658A US2964810A US 2964810 A US2964810 A US 2964810A US 730536 A US730536 A US 730536A US 73053658 A US73053658 A US 73053658A US 2964810 A US2964810 A US 2964810A
Authority
US
United States
Prior art keywords
wax
layer
drying
suspension
wax models
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
US730536A
Other languages
English (en)
Inventor
Hendrik Johannes Meerka Embden
Nieuwenhuis Casparus Antonius
Buijsman Petrus Johannes
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2964810A publication Critical patent/US2964810A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B22C9/04—Use of lost patterns
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/12—Treating moulds or cores, e.g. drying, hardening

Definitions

  • This invention relates to methods of drying wax models coated with a moist layer of a suspension of fine ceramic material, devices for carrying out such methods and products obtained by such methods.
  • the casting moulds are obtained by applying by pouring a ceramic paste to models made up of wax, which paste hardens after some time.
  • the wax is removed from the resultant mould by melting, Whereafter the mould is dried and burnt to form a porous stone, into which the molten metal is introduced.
  • the stone must satisfy several conditions, viz:
  • the inner wall of the mould requires a smooth surface so that the casting also acquires a smooth surface.
  • the contradictory requirements mentioned sub (2) and (3) are usually fulfilled by first coating the wax model with a thin layer of a very fine mass, behind which a material coarser but more porous is provided.
  • This first thin layer is applied to the wax models by immersion or spraying with a suspension of fine ceramic material containing a binder, which is subsequently dried, whereafter the moulds are obtained by pouring a coarser suspension onto these wax models.
  • the object of the invention is to provide means of obtaining great constancy in the dimensions of castings.
  • the drying process takes place at a temperature maintained constant at a value such that the wax does not soften and also with a high relative humidity of the ambient air.
  • wax Since wax has a high coeflicient of expansion, differences in temperature may result in variations of the dimensions.
  • the wax When, subsequently, the whole assumes the ambient temperature, the wax again expands, with the result that the ceramic layer must necessarily crack and/or blister. This loose layer is deteriorated or may partly be rinsed away during the subsequent treatment, the pouring out of the coarse suspension. Consequently, the liquid of the coarse suspension may penetrate between the covering layer and the wax, causing the smooth surface to be roughened, or during pouring in the molten metal this may penetrate the coarse mass of the mould, so that the casting then also becomes unserviceable.
  • a method of making a precision ceramic mold comprising the steps of applying a thin layer of a liquid suspension of a relatively finelycomminuted ceramic material over a wax model, drying the layer of finely-divided material on the wax model in an atmosphere having a relative humidity of about 80 to 90% and a temperature below the softening point of the wax, applying over the dried thin layer of finely-comminuted material a layer of relatively coarse ceramic material, and melting the wax to remove the same from the mold.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Mold Materials And Core Materials (AREA)
US730536A 1957-05-18 1958-04-24 Method of drying wax models Expired - Lifetime US2964810A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL217416 1957-05-18

Publications (1)

Publication Number Publication Date
US2964810A true US2964810A (en) 1960-12-20

Family

ID=19750889

Family Applications (1)

Application Number Title Priority Date Filing Date
US730536A Expired - Lifetime US2964810A (en) 1957-05-18 1958-04-24 Method of drying wax models

Country Status (4)

Country Link
US (1) US2964810A (enrdf_load_html_response)
CH (1) CH364586A (enrdf_load_html_response)
GB (1) GB889948A (enrdf_load_html_response)
NL (2) NL101477C (enrdf_load_html_response)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191250A (en) * 1964-04-16 1965-06-29 Mellen High speed drying apparatus for refractory shell molds
US3850224A (en) * 1973-07-30 1974-11-26 Sherwood Refractories Process and apparatus for drying shell molds

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431201A (en) * 1944-04-21 1947-11-18 Donald W Ross Drying of porous masses
US2441695A (en) * 1944-05-31 1948-05-18 Austenal Lab Inc Casting mold
GB707843A (en) * 1951-07-12 1954-04-21 Svenska Flaektfabriken Ab Method of drying ceramic products
US2703913A (en) * 1950-02-06 1955-03-15 Bristol Aeroplane Co Ltd Precision casting
US2756475A (en) * 1953-02-24 1956-07-31 Gen Motors Corp Investment mold and core assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2431201A (en) * 1944-04-21 1947-11-18 Donald W Ross Drying of porous masses
US2441695A (en) * 1944-05-31 1948-05-18 Austenal Lab Inc Casting mold
US2703913A (en) * 1950-02-06 1955-03-15 Bristol Aeroplane Co Ltd Precision casting
GB707843A (en) * 1951-07-12 1954-04-21 Svenska Flaektfabriken Ab Method of drying ceramic products
US2756475A (en) * 1953-02-24 1956-07-31 Gen Motors Corp Investment mold and core assembly

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3191250A (en) * 1964-04-16 1965-06-29 Mellen High speed drying apparatus for refractory shell molds
US3850224A (en) * 1973-07-30 1974-11-26 Sherwood Refractories Process and apparatus for drying shell molds

Also Published As

Publication number Publication date
CH364586A (de) 1962-09-30
NL217416A (enrdf_load_html_response)
NL101477C (enrdf_load_html_response)
GB889948A (en) 1962-02-21

Similar Documents

Publication Publication Date Title
US3379543A (en) Composition and method for making ceramic articles
US2991267A (en) Coated sand and method of making the same
US3351688A (en) Process of casting refractory materials
GB879388A (en) Method and apparatus for drying shell-type refractory molds
JP2655275B2 (ja) インベストメント鋳造用鋳型の製造方法
JPH0262104B2 (enrdf_load_html_response)
US3903950A (en) Sandwich structure mold
US2948935A (en) Process of making refractory shell for casting metal
US2886869A (en) Graphite refractory molds and method of making same
US2815552A (en) Method of making a mold by the lost-wax process
US2964810A (en) Method of drying wax models
US10259036B2 (en) Variable diameter investment casting mold for casting of reticulated metal foams
US3770044A (en) Method of dewaxing shell molds
US2383812A (en) Mold and fabrication method
US3132388A (en) Method of removing the pattern from a thin shell investment mold
JPH0623505A (ja) ダイカスト鋳造用崩壊性置中子
JP4381981B2 (ja) 改良された埋没鋳造法
US2908952A (en) Method of forming an investment mold
US3485288A (en) Method of making a mold for casting of refractory and reactive metals
US2880486A (en) Method of making investment castings
GB2148760A (en) Casting metal in a sand backed shell mould
US3156023A (en) Method of investment casting
US3018528A (en) Method of form removal from precision casting shells
US3257693A (en) Method and pattern material for precision investment casting
US5266252A (en) Ceramic slip casting technique