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JPS55114441A - Production of mold - Google Patents

Production of mold

Info

Publication number
JPS55114441A
JPS55114441A JP2387379A JP2387379A JPS55114441A JP S55114441 A JPS55114441 A JP S55114441A JP 2387379 A JP2387379 A JP 2387379A JP 2387379 A JP2387379 A JP 2387379A JP S55114441 A JPS55114441 A JP S55114441A
Authority
JP
Japan
Prior art keywords
shell layer
refractory
layers
mold
layer
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.)
Pending
Application number
JP2387379A
Other languages
Japanese (ja)
Inventor
Seiji Watabiki
Noboru Terunuma
Toshiaki Saito
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP2387379A priority Critical patent/JPS55114441A/en
Publication of JPS55114441A publication Critical patent/JPS55114441A/en
Pending legal-status Critical Current

Links

Landscapes

  • Mold Materials And Core Materials (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

PURPOSE: To produce the precision-casting mold which provides smooth casting surfaces by heating the shell layer, which is constituted by a ceramic shell layer part and a reinforcing refractory particle layer part on the outer side, in steam flow then firing the same thereby evening the thermal expansion of the foregoing both layers.
CONSTITUTION: Boric acid or boron oxide is added to the refractory slurry for the 1st and 2nd layers and a ceramic shell layer is formed on the surface of an extinction pattern. For the 3rd and subsequent layers, the refractory particle layer reinforcing the ceramic shell layer is formed by using ordinary refractory slurry. Thence, the outer shell for mold obtained in the foregoing process is heated in steam flow to sublimate boric acid or boron oxide and remove the pattern, whereby the precision casting mold which evens the thermal expansion of the ceramics shell layer and refractory particle layer is produced.
COPYRIGHT: (C)1980,JPO&Japio
JP2387379A 1979-02-27 1979-02-27 Production of mold Pending JPS55114441A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2387379A JPS55114441A (en) 1979-02-27 1979-02-27 Production of mold

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2387379A JPS55114441A (en) 1979-02-27 1979-02-27 Production of mold

Publications (1)

Publication Number Publication Date
JPS55114441A true JPS55114441A (en) 1980-09-03

Family

ID=12122558

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2387379A Pending JPS55114441A (en) 1979-02-27 1979-02-27 Production of mold

Country Status (1)

Country Link
JP (1) JPS55114441A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999030854A1 (en) * 1997-12-15 1999-06-24 Pcc Structurals, Inc. Method for imaging inclusions in investment castings
US6237671B1 (en) 1997-10-30 2001-05-29 Howmet Research Corporation Method of casting with improved detectability of subsurface inclusions
US6619368B1 (en) 1997-12-15 2003-09-16 Pcc Structurals, Inc. Method for imaging inclusions in investment castings

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6237671B1 (en) 1997-10-30 2001-05-29 Howmet Research Corporation Method of casting with improved detectability of subsurface inclusions
WO1999030854A1 (en) * 1997-12-15 1999-06-24 Pcc Structurals, Inc. Method for imaging inclusions in investment castings
US6102099A (en) * 1997-12-15 2000-08-15 Pcc Structurals, Inc. Method for imaging inclusions in investment castings
US6619368B1 (en) 1997-12-15 2003-09-16 Pcc Structurals, Inc. Method for imaging inclusions in investment castings

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