Safety precautions for the operation of pipe bending machines at different stages

The fully automatic pipe bending machine is a multi-step programming function that can also achieve automatic operation, which can greatly help improve production efficiency. Because the hydraulic pipe bending machine adopts a steel plate welding structure, stress can be eliminated during vibration. Also, they are all high-quality imported sealing rings, so they are relatively stable and reliable. Most of the main working methods are piston type presses, and their driving force generation has obvious characteristics, which are closely related to the mold production process. However, it cannot be denied that the production safety of the pipe bending machine is higher, and the safety precautions that need to be paid attention to in normal use include the following:
The characteristic of fully automatic work is to form pressure through two parallel moving hydraulic cylinders, which are vertically downward and can drive the bending beam mold for bending work. The typical bending process of upward bending beams includes several stages and stages, including downward movement, static state and pressure reduction, return, and so on:
1： Downward movement
The normal downward rapid closing motion generally adopts a free fall type, which generates motion through its own weight; But the production of the mold is not like this, but uses a hydraulic cylinder without a rod chamber to generate pressure, so the fast forward speed can reach 250mm/s, which is more suitable for the production of stronger molds.
The fast forward motion starts from the top dead center and ends with a brief brake, such as bending a certain distance of the sheet metal, depending on the requirements of the mold manufacturing.
2： Stationary state
The fully automatic pipe bending machine is in a stationary position with the upper bending beam at the top dead center. This state is to prevent uncontrolled downward movement and reduce safety risks.
3： Decompression
Reducing pressure in the rodless cavity or starting after the holding time when reaching the bottom dead center can further improve the accuracy of the workpiece. Both pressure maintaining and pressure reducing can be commanded and controlled through a proportional directional valve. Customize the running cycle time as needed. When pressure reduction is required, it can be shortened as much as possible, but the pressure reduction curve should not be too steep and should be as stable as possible.
4： Return trip
This involves a large return speed, which mainly depends on the flow rate of the pump and the pressure bearing area of the rod chamber of the hydraulic cylinder. In general, the closer to the fast speed, the higher the return efficiency. The return journey also requires synchronization.
5： Stamping and bending
The next stage is stamping and bending, which is a key link in the production of the pipe bending machine mold, and also the latter stage. The stamping speed is limited by the oil supply of the oil pump, and is also regulated by the manual intervention of the proportional valve direction valve.