... , single and double groove pipe, tube frame 1. Roller and mould for round pipe, square pipe, shaped pipe, etc. 2. Precise ... fan-shaped tube, polygonal tube, single and double groove pipe, tube frame, special-shaped mould, etc.3. Specification ... quenching.9. Maching process: Raw materials- materials testing- exercise- saws- turning- drilling- turning- CNC precision turning- grinding- quenching- ...