Bellows forming machine
The set of machine have two parts: bellows forming machine and bellows bending machine.
Bellows forming machine can roll round pipes to bellows,and bellows bending machine can bend the bellows to 90°or 45°elbow
For hydroformed bellows, this is a common forming method. Its principle is to use liquid pressure in the tube blank to expand and form in a restricted ring, and can be compressed along the ring. After reaching the required length, this method is often used for small-diameter plastic bellows.
1. Hydroforming process, hydroforming is a widely used and common forming method for metal bellows. It is mainly used to manufacture annular bellows, and can form bellows with a wall thickness of 0.08~4mm. Bellows hydroforming is that the tube blank is formed into a bellows in a special mold under the pressure of the inner wall liquid, when the stress exceeds the yield strength.
2. Mechanical forming process, mechanical forming of bellows, including spinning forming, rolling forming and mechanical expansion and other processes.
Generally speaking, mechanical forming has the advantages of simple process, easy tooling manufacturing, and high production efficiency. At the same time, there are also shortcomings such as relatively rough product manufacturing and low performance. It is mostly used in the manufacture of spiral bellows, corrugated expansion joints, and large-diameter thick-walled bellows.
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