YAWEI / NC MEC USA, Inc. PBH Technical Features

Machine Frame

The frame is an assembly of a heavy steel plate consisting of 2 side frames, a upper and lower cam plate, reinforced sheet-metal plate for the oil-tank and the hydraulic unit. After welding of the frame it is de-stressed. Some of the main features of this frame are:

1. The machined cylinder mount is a integral part of the side-frame.

2. The extra heavy side and rear plates provide superior frame stability.

3. The "Triple Structure Table" provides a rigid die support, but allows for hydraulic crowning.

Ram electrical / hydraulic closed-loop servo system

Servo Valves are directly mounted to the ram positioning cylinders by manifolds, minimizing the distance between the valves and cylinders while eliminating hose connections and flexing, this provides a more responsive and tighter servo network with more reliable and better positioning.

Ram guides are positioned closer to the bending point and are spread wider apart for better guiding and stability.

Ram position feedback to the bed is accomplished by the use of linear encoders (one each side for Y1 & Y2) thus allowing for independent feedback and control for each servo valve. Each encoder can measure with an accuracy of 0.005mm, (.0002"), thus allowing ram control of 0.01mm, (.0004"). These encoders are mechanically uncoupled from the bending frame (separate from the side frames and the main body to the machines) through the use of two independent measuring frames (one each side), thus eliminating any frame deflections during bending.

Two Axis, independently controlled Ram

The two hydraulic cylinders (Y1 & Y2) are independently controlled and are connected to the ram by means of spherical washers. With this technique you can compensate for varying material thickness and or fade bend allowing for varying angles along the work piece.

Triple Structure Table

The triple independent structured table (Bed), has been designed to allow for automatic crowning of the center table, by using CNC controlled hydraulic cylinders mounted on the outboard tables and pushing on the center table. The center table and the side frames are joined through the outboard tables by spherical washers, thus allowing for a smooth curve over the entire length of the table.

Crowning

The standard machine is equipped with hydraulic crowning. This crowning is automatically calculated and driven by the numerical control. These calculated values can be adjusted (higher or Lower) by the operator. The main advantage of this crowning is that it starts to work once the working pressure has been reached in the main cylinders, during this process the bed is caused to automatically deflect parallel with the ram under CNC control.

	Backgauge The standard machine is equipped with a 2 axis back gauge, X & R . Both axes are mounted on linear guides and a ball screw assumes the displacement. The stable construction, combined with 3 multi-functional fingers, offers not only a high precision but also a maximum stroke 1000 mm. All three fingers are also mounted on linear guides for an easy and soft positioning of the Z-axis. Of course each finger can be put upright and the fingertips are exchangeable. Optional axis available Z1/Z2, X1, or 6 axis.

	Tool Clamping The standard execution of the tooling is European. A mechanical fast-clamping system is provided for the upper tools. European type and single V dies can be fitted on the table. Other tool clamping such as hydraulic systems is available on request.

	Stroke and daylight The bed for the lower tools is mounted directly onto the lower beam and needs no further mechanical structures to compensate the table deflection. A further advantage of this design is that with a relative low overall height, a max. usable daylight and a big stroke lift is obtained. The result is an PBH Press Brake with flexible usage. The double guided ram on both ends guarantees a maximum precision and allows a non-centered bending.

Hydraulic Unit

All the hydraulic components are provided by the same supplier. The company Hoerbiger - Germany –supplies the servo valves as well as the directional and check-valves, hydraulic blocks and the pump (Hoerbiger-Eckerle).

This complete solution of only one manufacturer guarantees an optimum usability of the hydraulic system.


	CNC Control The PBH series press-brakes are standard equipped with Cybelec most modern numerical control, the ModEva 10S with Windows operating system. Characteristics: - Easy numerical 2D – graphical programming - Auto bend sequence proposal - 10.4” – TFT – Color monitor - Ethernet LAN Network adapter board - 256 MB RAM Memory - 1 GB flash memory - Windows XP operating system - Automatic sequence change.

	Light curtain (Option) Unique interface for enhancing machine operation with cycle from first interrupt while monitoring to pinch point. OSHA/USA compliant. Light Curtain / Laser Safe (Option) Light Curtain is integrated with Laser Safe PCSS-FL for added protection and unique interface for enhancing machine operation with cycle from first interrupt while monitoring to pinch point. OSHA/USA, CSA/Canada, CE compliant.