Hydraulic processing method of glass fiber reinforced plastic product

Abstract

The invention relates to a hydraulic processing method of a glass fiber reinforced plastic product. The hydraulic processing method sequentially comprises the following steps in each working cycle: (1) quick down-moving of a sliding block: pressure oil enters a middle cylinder and side cylinders, a return cylinder communicates with an oil tank, and the sliding block moves downwards quickly; (2) slow down-moving and pressurizing of the sliding block: the middle cylinder is used for independent pressing, the side cylinders are used for independent pressing, the middle cylinder or the side cylinders are firstly used for independent pressing, then the other cylinders are used for joint pressing, and the return cylinder provides support back pressure; (3) pressure maintenance of the sliding block; (4) pressure relief of the sliding block: the middle cylinder and the side cylinders communicate with the oil tank; (5) ejecting-out of a mold opening cylinder: the pressure oil enters a lower cavity of the mold opening cylinder, an upper cavity of the mold opening cylinder returns oil to the oil tank, and a piston rod of the mold opening cylinder pushes the sliding block to move upwards for acertain distance, so that an upper mold and a lower mold are separated; (6) returning of the sliding block: the pressure oil enters the return cylinder, and the sliding block moves upwards; and (7) drawing-back of the mold opening cylinder: the pressure oil enters the upper cavity of the mold opening cylinder, so that the piston rod of the mold opening cylinder is enabled to retract, and the lower cavity of the mold opening cylinder returns oil to the oil tank. According to the hydraulic processing method of the glass fiber reinforced plastic product in the invention, pressing processes withdifferent tonnages can be adopted, the working efficiency is high, and the product quality is good.

Description

Technical field [0001] The invention relates to a hydraulic machine, in particular to a hydraulic processing method of glass fiber reinforced plastic products, and belongs to the technical field of hydraulic machine tools. Background technique [0002] FRP products have the characteristics of light weight, high strength, corrosion resistance, thermal insulation, etc., and are in a leading position in the development of high and new technology in various industries of the national economy. It is one of the main development directions of traditional industrial technology structure and product structure adjustment. At present, the hydraulic processing methods of FRP products in the world all adopt a single hydraulic transmission form. The main structure of the main machine generally adopts three typical structures of four-column type, combined frame type or integral frame type. The pressing stroke and closing height of the slider are determined by Determined by the specifications of...

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Problems solved by technology

[0003] FRP products manufactured by traditional hydraulic machines have the following disadvantages: 1. The opening and closing of the liquid filling valve is not fast enough and unstable; 2. The down speed of the slider is single, which fails to achieve fast no-load speed and slow heavy-load speed. 3. Failure to use accumulators and proportional flow valves makes the transition too hard in the down and return journeys, and there are obvious pauses; 4. The layout of the oil cylinder and tie rods is single, which fails to solve the problem of stress concentration

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