30results about How to "Low mold requirements" patented technology

The invention belongs to the technical field of a multilayer structural composite material member and a preparation method thereof and specifically discloses the composite material member with a surface function layer and a VIMP preparation method thereof. The composite material member comprises an outer surface layer and a main body layer, wherein, the outer surface layer and the main body layer are respectively a first composite material system and a second composite material system; and the first composite material system takes epoxy resin, phenolic resin and the like as a matrix, the second composite material system takes unsaturated polyester resin as a matrix, and the two systems take fiber cloth of carbon fiber or glass fiber as reinforcement. The VIMP preparation method comprises the following steps: firstly preparing a reinforced resin film on a die surface for vacuum dip molding by a resin film infiltration process, and then preparing the composite material member with a molding die covered with the reinforced resin film through the vacuum dip molding process. The VIMP process of the invention combines the double advantages of an RFI process and the VIMP process; and the obtained composite material member has better surface quality, better integrity and excellent comprehensive performances.

The invention discloses a method for maintaining pressures and then quickly boosting the pressures for metal low-pressure casting molding of aluminum alloy automobile chassis castings. The method includes that existing processes for low-pressure casting of aluminum alloy automobile chassis castings continue to be carried out at liquid lifting, mold filling and crystallization pressure boosting stages, and liquid lifting pressures, mold filling pressures and crystallization boosted pressures are 15-21 kPa, 25-35 kPa and 80-100 kPa under the control respectively; stages for maintaining the pressures and then quickly boosting the pressures are added between crystallization pressure maintaining stages and pressure releasing stages; a plurality of characteristic positions are set according to structure characteristics and solidification sequences of the castings; crystallization maintained pressures start to be increased and reach 150-1000 kPa after the fact that the characteristic positions A start to be solidified is determined, and the pressure boosting speeds are 10-40 kPa/s; then the castings enter pressure maintaining stages, the characteristic positions B, the characteristic positions C and the characteristic positions D are sequentially solidified, and the pressures continue to be maintained for 10-60 s after the characteristic positions D are completely solidified. The method has the advantages that solidification shrinkage supplementing effects and mechanical properties of the castings can be obviously improved, shortcomings of flashing of molten liquid, burr and flash of existing castings and the like can be overcome, and requirements on mold structures and casting mold clamping force can be obviously lowered.

The present invention relates to a zirconium oxide ceramic insertion needle forming method and its equipment. The zirconium oxide ceramic insertion needle can be used as optical fibre connector and is made up by adopting the following steps: using organic monomer, cross-linking agent and deionized water and making them into premixed material, then adding ceramic powder body, ball-grinding, addingcatalyst and initiator, injecting the above-mentioned mixed slurry material into mould cavity, forming to obtain blank body, drying and sintering so as to obtain the invented product.

The invention discloses a vacuum formation preparation method for a yacht. The vacuum formation preparation method for the yacht includes the steps of cleaning, waxing, get coating spraying, lamination, vacuum laying-up, grinding and trimming and mold releasing. On the basis of traditional hand lay-up molding, formation of the yacht is carried out through a vacuum injection process. The vacuum formation preparation method not only has the advantages of traditional and lay-up molding that construction is easy, requirements for a mold are low, and maintenance is easy, but also reduces use of resin in the preparation process, reduces volatile components in the preparation process, is more environmentally friendly, and enables the resin to be distributed more evenly and produced products to be higher in mechanical property, better in waterproof performance and higher in quality.