EN Machines, Necking - in Process

The machine:

Leico heavy-duty EN series necking-in machines were developed for hot forming of high-pressure gas bottles. Starting from a tube, gas-tight bases as well as necks can be formed. EN machines are typically used to produce pressure vessels such as accumulators, fire extinguishers, CNG cylinders and other rotationally symmetrical hollow forms where the wall thickness can be controlled during the forming process

The method:

The end of the tube or blank to be formed is pre-heated to the working temperature of the machine, either in a furnace or by use of an induction coil. An automatic loader feeds the part into the hollow spindle where it is located and held in a chucking system. With the spindle rotating at a controlled speed the forming operation is performed by a roller or pad mounted on a swivel slide running in heavy-duty bearings. The motion and speed of the forming device is controlled and optimized as required with the aid of the CNC. By virtue of the swiveling action of the slide, the forming device is maintained at the correct approach angle to the part to be formed at each stage of the process. Heat loss during forming is compensated by the use of gas burners directed at the part being formed. On completion, the formed part is ejected from the spindle onto an automatic unloader. This removes the finished part from the machine working area and transfers it onto a conveyor system for post forming processes.










EN Machines, Necking - in Process The machine: Leico heavy-duty EN series necking-in machines were developed for hot forming of high-pressure gas bottles. Starting from a tube, gas-tight bases as well as necks can be formed. EN machines are typically used to produce pressure vessels such as accumulators, fire extinguishers, CNG cylinders and other rotationally symmetrical hollow forms where the wall thickness can be controlled during the forming process The method: The end of the tube or blank to be formed is pre-heated to the working temperature of the machine, either in a furnace or by use of an induction coil. An automatic loader feeds the part into the hollow spindle where it is located and held in a chucking system. With the spindle rotating at a controlled speed the forming operation is performed by a roller or pad mounted on a swivel slide running in heavy-duty bearings. The motion and speed of the forming device is controlled and optimized as required with the aid of the CNC. By virtue of the swiveling action of the slide, the forming device is maintained at the correct approach angle to the part to be formed at each stage of the process. Heat loss during forming is compensated by the use of gas burners directed at the part being formed. On completion, the formed part is ejected from the spindle onto an automatic unloader. This removes the finished part from the machine working area and transfers it onto a conveyor system for post forming processes.