10 results about "Vacuum assisted" patented technology

The invention discloses a composite material raft frame integral forming method and a mold in the technical field of ship structure design. The composite material raft frame integral forming method comprises the steps of prepreg blanking, mold pretreatment, layered gradual paving, hot-pressing curing and post-treatment. And through modular prefabricated body construction and a differentiated layering strategy, integral forming of continuous transition of fibers is achieved, and the interface failure risk of a traditional glue joint structure is eliminated. The mold adopts a detachable silica gel steel core design and is combined with a vacuum-assisted cold pressing process, so that the compactness and the dimensional precision of the material are ensured. By adopting the synergistic effect of a partition differentiation laying strategy and a bionic reinforcing framework, a discrete structure originally depending on glue joint is converted into an integral bearing frame with fibers naturally transited, the geometric mutation risk at the joint of the rib plate and the lower plate is eliminated, and through a closed grid structure formed by extending the laying layer through the prepreg, the strength of the rib plate and the lower plate is improved. And a load transmission path is converted from shear dependence of an adhesive layer to fiber-dominated axial continuous transmission.

The utility model discloses vacuum auxiliary impregnation equipment, and relates to the technical field of glass fiber reinforced plastic cylinder production, the vacuum auxiliary impregnation equipment comprises a workbench, the bottom end of the workbench is fixedly connected with a bottom plate, the upper surface, close to the workbench, of the bottom plate is provided with a vacuum pump, and the upper surface of the workbench is symmetrically provided with impregnation boxes; an inner cavity of the gum dipping box is communicated with the input end of the vacuum pump, the outer wall of the gum dipping box is fixedly connected with a sealing strip, and a gum inlet is formed in the upper surface of the gum dipping box. Through cooperation of the opening and closing mechanism and the auxiliary mechanism, the effect of conveniently lifting the impregnated glass fiber reinforced plastic cylinder out of the impregnation box is achieved, after impregnation of the glass fiber reinforced plastic cylinder is completed, the impregnation box is opened through the opening and closing mechanism, and in the opening process, the impregnation box drives the auxiliary mechanism to operate synchronously, so that the auxiliary mechanism lifts the glass fiber reinforced plastic cylinder out of the impregnation box; therefore, the glass fiber reinforced plastic cylinder can be taken down conveniently.

The invention refers to a venting device (20) for vacuum die casting. The device comprises: an input port (15) meant to be fluidly connected to a die casting mould cavity, an output port (10) meant to be fluidly connected to a vacuum source, a gas evacuation channel (19) fluidly communicating the input port (15) with the output port (10), a cooling channel (18) fluidly communicating the input port (15) with the output port (10), a valve member (17) arranged to open and close the passage between the input port (15) and the gas evacuation channel (19). Preferably, at least a section of the cooling channel (18) has a wavy configuration. The venting device (1) optimizes the efficiency of the mould venting by means of the two channels (18, 19) to discharge the gases from the mould cavity (2).

The application relates to the demolding technical field and discloses a vacuum-assisted resin infusion forming material plate demolding workbench, which comprises a fixing table, a moving part and a prying knife. The fixing table is provided with a fixing table surface for placing a first plate layer and a second plate layer. The moving part comprises a moving part body and a first moving wheel connected to the moving part body. At least part of the prying knife is adapted to be inserted between the first plate layer and the second plate layer. The prying knife is connected to the moving part body, so that the prying knife is driven to move by the moving part. The beneficial effect is to improve the demolding quality and the demolding efficiency.

The invention discloses a hot-pressing vacuum-assisted and segmented pressurizing and heating curing forming method and a product thereof, and belongs to the technical field of materials and processing, the forming method comprises the following steps: S1, preparing a prepreg, and laying the prepreg according to a preset laying mode to obtain a laying blank; s2, auxiliary materials are laid on the surface of the laying green body, wherein the auxiliary materials at least comprise vacuum bags; s3, the mold is closed, the interior of the vacuum bag is vacuumized, and the laying layer green body is in a vacuum state; under the condition that the interior of the vacuum bag is kept vacuum, external air pressure is applied to the laying layer green body; meanwhile, heating and curing are conducted on the laying layer green body; and S4, after curing is completed, demolding is conducted, and the composite material product is obtained through aftertreatment. The hot-pressing vacuum auxiliary forming method disclosed by the invention can effectively solve the problems that an existing composite material forming process is difficult to consider both high quality and high efficiency, and is high in cost and high in energy consumption.

The invention belongs to the field of composite material liquid forming simulation and prediction, and relates to a composite material vacuum-assisted resin infusion simulation method based on a dynamic mesh, which comprises the following steps: establishing a two-phase flow control equation set in a VARI mold filling process; tracking to obtain the thickness of the preform in the mold filling process of the vacuum-assisted resin infusion process, and predicting the permeability of the preform by using an exponential function fitting model; updating the grids in each time step, iteratively solving the flow field in the corresponding new grids in each time step, dispersing and solving the Laplacian equation to obtain the new grids, and updating the physical property parameters of the preform; the grid surface speed is added for the two-phase flow control equation set, and the unit volume change is corrected; and circularly updating the grid form and iteratively solving the flow field, continuously advancing the time step, and stopping calculation until a preset cycle index is reached and a preset filling threshold value is reached. According to the invention, the dynamic change of the component shape can be visually presented geometrically, and the integrated simulation of the filling process and the component shape evolution is realized.

The invention discloses a vacuum collaborative low-pressure forming aluminum alloy thin-wall part casting forming mold and process, the low-pressure forming aluminum alloy thin-wall part mold comprises an upper mold, a bottom mold and a plurality of side molds matched with the bottom mold, the low-pressure forming aluminum alloy thin-wall part mold further comprises a steel core, and the upper mold, the bottom mold and the side molds are encircled and combined with the steel core to form a cavity for forming a casting; a sprue is formed in the middle end face of the bottom die. Compared with the prior art, according to the low-pressure forming aluminum alloy thin-wall casting mold and process, the interior of the mold cavity can be pumped to be in a negative pressure state through the negative pressure device, the pressure difference between the interior and the exterior of the mold cavity is formed, on one hand, air resistance and flowing resistance in the mold filling process of aluminum alloy liquid are remarkably reduced, and the defects of insufficient mold filling, cold shut and the like are overcome; residual air in the cavity and gas involved in the aluminum alloy liquid in the mold filling process are thoroughly exhausted, gas defects such as air holes and needle holes are prevented, and meanwhile oxide inclusions caused by contact of the aluminum alloy liquid and the air are reduced.

The present application relates to the ground treatment technology, especially to the weak ground treatment technology with high water content, in particular to a vacuum-assisted composite rigid drainage device and a drainage method, which solves the problem of poor bearing capacity improvement effect of the weak ground with high water content after dehydration in the prior art, and the need for secondary reinforcement treatment, and realizes rapid dehydration through the rigid vertical drainage assembly, the rigid horizontal drainage assembly and the vacuum-assisted device. After dehydration, the vertical drainage unit is left in the soil to directly improve the bearing capacity of the soil body for the large machinery to enter. The rigid vertical drainage assembly comprises a plurality of vertical drainage units inserted into the weak ground, the vertical drainage unit comprises a rigid plate-shaped part, the plate surface of the rigid plate-shaped part is provided with vertically distributed drainage ropes, and the outside is wrapped with a water-permeable geotextile; the rigid horizontal drainage assembly comprises a rigid drainage support layer covering the surface of the weak ground, the upper surface of the rigid drainage support layer is provided with a flexible sealing layer, and the flexible sealing layer is provided with a drainage port.

The application provides a polyimide composite helmet and a preparation method thereof, and comprises the following steps: spraying a release agent in an upper and lower mold, laying a release cloth on the inner mold after the release agent volatilizes, placing polyimide needle-punched felt on the release cloth of the lower mold, covering the upper mold and fixing; injecting polyurethane resin into the cavity of the upper and lower mold by using a vacuum assisted forming process, so that the polyurethane resin infiltrates the polyimide needle-punched felt; mixing high-toughness and high-strength polyimide short fibers and polyurethane resin, adding an additive and a curing agent, and stirring uniformly to form a mixture; injecting the mixture into the cavity of the upper and lower mold by using a vacuum assisted forming process; transferring the upper and lower mold to a hot press tank platform for processing and molding to obtain the polyimide composite helmet. The polyimide composite helmet prepared by the application has the advantages of high toughness and high strength, light weight, excellent impact resistance and the like, and ensures that the helmet has better aging resistance under long-term use conditions.