A method for pressure transfer molding of composite materials and a pressing mold

Abstract

The invention discloses a composite material pressure transmission molding method and a pressing mold. The pressing mold comprises a bottom plate, a compression cavity, a pressing plate and a model, wherein the model is placed in the compression cavity and matched with product specification. The method comprises the following steps of adding a transmission object into a pressing cavity body in themold pressing process to serve as a pressure transmission medium, pasting the model with a molding material and then embedding the model into the transmission object, covering the upper pressing plate, and finally tightly locking the pressing cavity body for pressing and curing. According to the composite material pressure transmission molding method and the pressing mold, the problem that a coreand a cavity are needed during existing mold pressing pressurization can be solved, and since only one model is needed, the mold manufacturing cycle and cost can be reduced; high forming pressure, upto 20 Mpa or more, can be provided, so that the density of a product is guaranteed, and the mechanical strength of the product is improved; and meanwhile, investment for expensive hot pressing tank equipment is not needed, pressurization can be performed by using an externally-arranged pressure source, and heating is carried out through multiple heating modes of using an oven, a heating plate, aheating rod and the like, different requirements of various materials on molding conditions are met while the cost is saved, and therefore wide adaptability can be achieved.

Description

technical field [0001] The invention belongs to the field of material forming, and particularly relates to a pressure transfer forming method of a composite material and a pressing die. Background technique [0002] The main pressure forming methods of composite materials are compression molding, vacuum bag molding, autoclave method, etc. The usual operation process is to first lay the pasted blank body, and then press the mold and the atmospheric back pressure and high-pressure gas formed after vacuuming. Molecular cross-linking and curing to obtain the final product. Although the pressure of traditional molding can be larger, it can be larger than 2.5Mpa, but there must be a pair of molds, that is, the core and the cavity need to be provided at the same time, which increases the mold production cycle and increases the cost; although the vacuum bag pressure can only have the core Or one of the cavities, but the added pressure is small, usually less than 0.1Mpa of an atmos...

AI Technical Summary

Problems solved by technology

Although the pressure of traditional compression molding can be larger, it can be greater than 2.5Mpa, but it must have a mold, that is, the core and the cavity must be equipped at the same time, thereby increasing the mold production cycle and increasing the cost; although the vacuum bag pressure can only have the core Or one of the cavities, but the added pressure is small, usually less than one atmospheric pressure 0.1Mpa, so the product is not dense enough; although the autoclave can reach a higher pressure, usually up to 1.5-2.5Mpa, the product density is high, but the equipment Expensive, high energy consumption, high manufacturing cost

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