The fully automatic pipe bending machine features multi-step programming and automatic operation capabilities, significantly boosting production efficiency. Constructed from welded steel plate, the machine is designed to eliminate stress caused by vibration. Additionally, the use of high-quality imported seals ensures stable and reliable performance. Most of these machines operate as down-acting (or top-piston) presses; their driving force characteristics are closely linked to the specific pipe-bending tooling processes employed. Nevertheless, these machines offer a high level of operational safety; key safety precautions for standard use include the following:

The operating characteristic of the fully automatic bending machine is that pressure is generated by two hydraulic cylinders moving in parallel; this downward-acting pressure drives the bending beam's tooling to perform the bending operation. The typical bending process of the upper bending beam comprises several stages and phases, including downward movement, a stationary state, decompression, and the return stroke.

1. Downward movement

Standard pipe bending machines typically employ a free-fall mechanism for the rapid downward closing movement—relying on the machine's own weight to generate the motion. In contrast, CNC pipe bending machines utilize pressure generated within the rodless chamber of the hydraulic cylinder; this enables a rapid approach speed of 250 mm/s, making the system better suited for the production of heavy-duty molds.

The rapid approach movement begins at top dead center; it concludes after a brief braking phase and a final travel distance—the specific parameters of which can be adjusted according to the requirements of the tooling.

2. Stationary state

In its resting position, the fully automatic pipe bending machine has its upper bending beam at top dead center. This state is designed to prevent uncontrolled downward movement and reduce safety risks.

3. Stress relief

Depressurization of the rodless chamber—or initiating the process after the holding time upon reaching bottom dead center—can further enhance part precision. Both the holding and depressurization phases can be controlled via proportional directional valves. Operating cycle times can be customized as needed; while depressurization should be as brief as possible, the pressure-drop curve must not be overly steep and should remain as smooth as possible.

4. Return Journey

This involves a high return speed, which depends primarily on the pump flow rate and the effective pressure area of the hydraulic cylinder's rod-side chamber. Generally, the closer the speed is to the rapid-traverse speed, the higher the return efficiency. Synchronization is also required during the return stroke.

5. Stamping and Bending

The next stage involves stamping and bending—a critical and final step in the production of tube-bending machine molds. The stamping speed is constrained by the oil pump's supply rate and is also subject to manual adjustment via proportional and directional valves.

Zhangjiagang Huameng Machinery Technology Co., Ltd. specializes in the manufacture of pipe bending machines, including CNC, hydraulic, and fully automatic models. Adhering to the business philosophy of "Customer First and Integrity-Based," the company sincerely welcomes new and existing clients; our entire team is dedicated to providing you with comprehensive service.