Warm hydraulic forming process and device of variable-section carbon fiber composite pipe

Abstract

The invention discloses a warm hydraulic forming process and device of a variable-section carbon fiber composite pipe. The warm hydraulic forming process comprises the steps of padding a layer of rubber pipe in an equal-section carbon fiber composite pipe; then, hooping the two end faces of the equal-section carbon fiber composite pipe and the rubber pipe by metal rings; then, putting the equal-section carbon fiber composite pipe containing the rubber pipe into a mould with a temperature control function and a variable-section cavity, heating the mould to softening the equal-section carbon fiber composite pipe, and plugging the two ends of the equal-section carbon fiber composite pipe; then, filling a hydraulic fluid into the equal-section carbon fiber composite pipe to bulge the equal-section carbon fiber composite pipe, and attaching the bulged equal-section carbon fiber composite pipe with the mould; and maintaining pressure, taking out the rubber pipe after cooling, and thus obtaining the variable-section carbon fiber composite pipe. The warm hydraulic forming process and the device can be used for obtaining some complex variable-section carbon fiber composite pipes which are difficult to form.

Description

technical field [0001] The invention belongs to the technical field of forming carbon fiber composite pipe fittings, in particular to a warm-state hydroforming process and device for variable cross-section carbon fiber composite pipes. Background technique [0002] Carbon fiber has been more and more widely used in lightweight design and manufacturing processes due to its excellent properties such as large specific strength and specific modulus. Traditional carbon fiber composite forming processes include hand lay-up process, liquid molding, pultrusion, winding and so on. The most common process for forming carbon fiber composite pipe fittings is the winding forming process. The winding forming process is to wind the continuous fiber soaked in the resin glue solution on the mandrel according to certain rules, and then solidify and demould to obtain the product. However, this process can only obtain simple pipe fittings with equal cross-sections everywhere. For complex pipe...

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Problems solved by technology

However, this process can only obtain simple pipe fittings with equal cross-sections everywhere. For complex pipe fittings with variable cross-sections, the problem with the winding forming process is that the mandrel inside the pipe fittings cannot be pulled out after the pipe fittings are formed. Because of this Due to the limitations of carbon fiber composite pipes, the forming of carbon fiber composite pipe variable cross-section pipe fittings requires a more excellent forming process

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