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757 experiments with near-beta titanium
News Automotive fuel level sensor redesigned by CAD. Fuel level sensor design has remained virtually unchanged for decades, relying on wire-wound resistances mounted on metal plates, with interconnecting wires, tubes, metal stampings and pressings. A new sensor design by Automotive Instrument Systems Ltd., produced with the aid of a CAD facility, has one, main acetal copolymer moulding with insert-moulded terminal connections and a thick fdm circuit, laser trimmed to suit the fuel tank characteristics. This obviates the need for a wirewouM resistance. The thick film comprises a ceramic tile with a palladium silver conductor pattern on which resistive inks are printed. Calibration is achieved by a laser trimming process. Acetal copolymer was selected for a combination of spring resilience, enabling snap-fitting of the thick film into place, resistance to fuel (including methanol/petrol mixture), low weight and processability. The performance of acetal copolymer in this environment is of interest
in the context of the selection of acetal homopolymer for a fuel pump housing described in the news pages in Vol III No. 4. In this case, a grade
Sand mould coating eliminates liquids
757 experiments with near-beta titanium An experimental landing gear support beam, forged in the titanium alloy 10V-2Fe-3A1, for the Boeing 757, was shown at the Farnborough Air Show by Titanium Metals and Alloys. The existing component is manufactured in Ti-6A1-4V, but the nearbeta alloy is isothermally forged at
Condition
AlloyType 0.2%Proof Stress (MN/m~) 'Elongation% FormabilityBend Ratio Forgeability(%)
lower temperatures than 6A1-4V, permitting cheaper forging die materials to be used. The 10V-2Fe-3A1 alloy was developed for high strength, with good toughness and hardenability and also enables close-to-finished-form forgings to be produced.
Commercially Pure Titanium
Ti-6AI-4V
Ti-I3VllCr~Al
Ti-10V-2Fe-3AI
Annealed
Annealed ST]AC; Aged
ST/WQ; Aged
ST/WQ; Aged
~-~ 370-710 35-22 1-2T 100
~-~
850-920 920-1080 12 10 3-5T 75
75
Near~ 1170-1290 4
of the Hoechst acetal copolymer has been used, whilst information from Amcel, another supplier of acetal copolymer, indicates that, in methanol/petrol mixtures, there is little discernable difference in the performance of copolymer and homopolymer, although individual grades of either may differ to some degree.
600-1170 22-8
A system has been developed for the foundry industry which supercedes the conventional process of using alcohol, chlorinated hydrocarbons or water as carrier liquids for the conveyance of refractory materials onto sand moulds and cores. At the heart of the Tribonal process is a powder coating having the necessary refractory nature to withstand the effects of molten metal and capable of giving a high standard of surface finish to the casting. The coating is sprayed onto cores or moulds by a spray gun which friction-charges the powder (a process known as tribocharging), creating a powder cloud of singly charged carriers; the coating is neither flammable nor toxic. Uniform deposition of coating is possible on even the most complex moulds; the narrow-necked spray-gun also permits the inside of tubular moulds to be sprayed easily. The project was jointly conceived by Mindon Engineering and Foseco and was demonstrated recently to Foseco representatives from the United States and Japan.
MATERIALS & DESIGN, VoL 3, OCTOBER 1982
in the context of the selection of acetal homopolymer for a fuel pump housing described in the news pages in Vol III No. 4. In this case, a grade
Sand mould coating eliminates liquids
757 experiments with near-beta titanium An experimental landing gear support beam, forged in the titanium alloy 10V-2Fe-3A1, for the Boeing 757, was shown at the Farnborough Air Show by Titanium Metals and Alloys. The existing component is manufactured in Ti-6A1-4V, but the nearbeta alloy is isothermally forged at
Condition
AlloyType 0.2%Proof Stress (MN/m~) 'Elongation% FormabilityBend Ratio Forgeability(%)
lower temperatures than 6A1-4V, permitting cheaper forging die materials to be used. The 10V-2Fe-3A1 alloy was developed for high strength, with good toughness and hardenability and also enables close-to-finished-form forgings to be produced.
Commercially Pure Titanium
Ti-6AI-4V
Ti-I3VllCr~Al
Ti-10V-2Fe-3AI
Annealed
Annealed ST]AC; Aged
ST/WQ; Aged
ST/WQ; Aged
~-~ 370-710 35-22 1-2T 100
~-~
850-920 920-1080 12 10 3-5T 75
75
Near~ 1170-1290 4
of the Hoechst acetal copolymer has been used, whilst information from Amcel, another supplier of acetal copolymer, indicates that, in methanol/petrol mixtures, there is little discernable difference in the performance of copolymer and homopolymer, although individual grades of either may differ to some degree.
600-1170 22-8
A system has been developed for the foundry industry which supercedes the conventional process of using alcohol, chlorinated hydrocarbons or water as carrier liquids for the conveyance of refractory materials onto sand moulds and cores. At the heart of the Tribonal process is a powder coating having the necessary refractory nature to withstand the effects of molten metal and capable of giving a high standard of surface finish to the casting. The coating is sprayed onto cores or moulds by a spray gun which friction-charges the powder (a process known as tribocharging), creating a powder cloud of singly charged carriers; the coating is neither flammable nor toxic. Uniform deposition of coating is possible on even the most complex moulds; the narrow-necked spray-gun also permits the inside of tubular moulds to be sprayed easily. The project was jointly conceived by Mindon Engineering and Foseco and was demonstrated recently to Foseco representatives from the United States and Japan.
MATERIALS & DESIGN, VoL 3, OCTOBER 1982