Press molding apparatus and press molding method

• Main Authors: HIROTA SHINICHIRO, FUMIMOTO TADAYUKI, TAJIMA HIDEMI
• Format: Patent
• Language: English
• Published: 06.10.2005
• Edition: 7
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GLASS; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METALLURGY; MINERAL OR SLAG WOOL; PERFORMING OPERATIONS; PRESSES; PRESSES IN GENERAL; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A press molding apparatus includes upper and lower mother molds 102 and 104 . Each of the mother molds 102 and 104 has four molding surfaces arranged in a single line and satisfies the relationship given by LxalphaxDeltaT/t<0.0008, where L represents the length, t, the thickness, alpha, the thermal expansion coefficient, and DeltaT, the temperature difference between both ends in the thickness direction during induction heating. The press molding apparatus may include a pressing mold set including upper mother molds 102 a and 102 b attached to a common fixed shaft 118 through upper supporting shafts 110 a and 110 b and lower mother molds 104 a and 104 b driven by a common drive shaft 120 through lower supporting shafts 112 a and 112 b. The upper mother molds 102 a and 102 b and the lower mother molds 104 a and 104 b are collectively heated by induction heating coils 122 and 124 , respectively.