A super-slender bellows forming process

Abstract

The invention discloses a forming process for an ultra-slender corrugated pipe. The forming process specifically includes the following steps: Step 1, feeding: placing the raw material of the corrugated pipe in the semicircular groove of the lower mold with several corrugated forming areas; Step 2, Mold closing: the upper mold is pressed down until it fits the lower mold; Step 3, plugging: use a pair of plunger rods with plugs to extend into the raw material of the corrugated pipe, and seal the corrugated molding on any corresponding forming mold in the raw material of the corrugated pipe The position of the area; step 4, bulging: high-pressure liquid injection into the closed area in step 3, so that the raw material of the corrugated pipe is partially bulged; step 5, squeezing: extrude both sides of the mold to realize the squeezing of the bulging part ;Step 6, mold splitting: drive the upper mold so that the upper mold rises away from the lower mold; Step 7, blanking: take the bellows out of the semicircular groove of the lower mold. The invention has the advantages of high degree of automation and can manufacture ultra-slender stainless steel bellows required by the water distribution system in large batches and with high efficiency.

Description

technical field [0001] The invention relates to the technical field of bellows forming, in particular to an ultra-slender bellows forming process. Background technique [0002] Pipe fittings with large bending angles are mostly manufactured in the way of "straight pipe + connector", that is, the bends of the straight pipes at both ends are connected by connectors. The joints of the pipe fittings will rust and expand due to long-term use. resulting in leaks at pipe connections. In the field of plumbing, such pipe fittings are mostly made of plastic, carbon steel and other materials, which have potential risks to human health and safety, and can easily lead to environmental pollution after being discarded; in addition, pipe fittings also have short service life, poor impact resistance, low shock resistance, Easy to cause water leakage and other shortcomings. [0003] The corrugated pipe is designed with a corrugated section at the bend of the straight pipe to make the pipe e...

AI Technical Summary

Problems solved by technology

Stainless steel bellows can overcome the shortcomings of existing pipe fittings such as poor impact resistance, short service life, easy damage and leakage, but the stainless steel bellows in the water distribution system are different from conventional bellows. The stainless steel bellows in the water distribution system are A kind of slender stainless steel corrugated pipe, the length of the pipe body generally exceeds 4000mm and there are multiple corrugated sections, the outer diameter of the pipe is about 20mm, that is, the aspect ratio of this stainless steel corrugated pipe will be above 200, and there is currently no The standardized forming method of stainless steel bellows of this size, the manufacture of this kind of bellows is still in the experimental stage, and there is no automatic forming equipment that can manufacture this kind of bellows in large quantities and efficiently. The reason why the method of "straight pipe + connector" has not been replaced by ordinary families

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