Patent DE-102008051622-A1 (DE)
Title: Producing a product by molding of liquid, pulpy, pasty, powdery, granular and/or solid material and/or its composition states using mold, comprises applying a periodic energy influence in the form of energy pulses with short time duration
Inventor: GSCHWINDER ROLAND
IPC: B22F3/087
Filed: 2008-10-02
Abstract: The method for producing a product by molding (injection molding and pressing) of liquid, pulpy, pasty, powdery, granular and/or solid material and/or its composition states using mold, comprises applying periodic energy influence in the form of energy pulses with short time duration and high intensity and in the form of deforming pressure and pressing pressure of pressure impulse with short time period and high force, and applying the energy impulses with different intensities, capacities and/or time durations and the pressure impulse with different forces, capacities and/or time durations. The method for producing a product by molding (injection molding and pressing) of liquid, pulpy, pasty, powdery, granular and/or solid material and/or its composition states using a mold, comprises applying a periodic energy influence in the form of energy pulses having short time duration and high intensity and in the form of deforming pressure and pressing pressure of pressure impulse having short time period and high force, and applying the energy impulses with different intensities, capacities and/or time durations and the pressure impulse with different forces, capacities and/or time durations for better compacting, pre-shaping and pre-sintering the partly finished products, for pre-debinding the products, for significantly reducing the sintering temperatures and for deformingly pressing the products to ensure a leveling of the temperature increase and the increase of the particulate composite strength up to pre-sintering temperature and the pre-sintered composite strength by gradual energy input, where the compacting and pre-sintering of the products are uniformly distributedly produced and accelerated in entire space of the mold. The number of pressure impulse and/or its force, capacity, duration and/or time point is controlled in dependent of the material composition of the products and its needed surfaces conditions. The pressure impulse of 1-100 is applied with impulse duration of 100 ms to 5 minutes and an impulse interval of 100 ms to 5 minutes. The pressure impulse is produced by pneumatically, hydraulically and gas-dynamically pulsed pressure generators, ultrasonic pressure generators, magnetostrictive pressure generators, thermostrictive pressure generators, plasma pressure generators, laser pressure generators, chemical pressure generators and/or pressure generators pulsed by electrical discharges, laser-initiated discharge and/or by microscopic explosions. The level of the pressure applying during deformation is reduced to 10-500 bar. The sintering temperature applied during sintering is reduced to 10-800[deg] C. The method controls pore-development, where the pore size is adjusted to 0.1 nm to 800 mu m. The wall thickness of the producible product has no limitation. The products are produced from different materials with different properties such as particle size without additional deforming steps. The debinding step is partially carried out during the deforming step. Porous structures are made of composition materials such as products with a porous core and metallic or ceramic walls. The products are produced with parts having different hardness and strength properties. The defined geometrical structures are impressed in the surface of the products. The structures in the micro area serve for improved friction characteristics of the product. An independent claim is included for a device for producing a product by molding (injection molding and pressing) of liquid, pulpy, pasty, powdery, granular and/or solid material and/or its composition states using a mold.