YAWEI / NC MEC USA, Inc. PBA Series 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.

Ram electrical / hydraulic closed-loop servo system

Top View

Servo Valves are centrally mounted minimizing the distance between the valves and cylinders, this provides a responsive servo network with more reliable and better positioning.

Ram guides are positioned closer to the bending point.

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 5/1000mm, (.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.

Compensation of Frame Deflection The position of the upper beam, in relation to the lower beam, is measured by two linear encoders that, by means of a robust measuring frame, are attached independent from the side frame. The machine is constructed in such a way that the outward spring of the side frames has no influence of the angle to be bent. The machine is equipped with long, adjustable and maintenance-free linear guides. This design has the possibility to set the upper beam at an angle for offset bending.

\|	Backgauge The standard machine is equipped with a X axis back gauge and manual R. Both axis are mounted on linear guides and a ball screw for accuracy. The stable construction, combined with 2 multi-functional fingers, offers not only a high precision but also a maximum stroke 1000 mm (40"). Of course each finger can be put upright and the fingertips are exchangeable. (Optional R 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 or dual type can be used. Other tool clamping systems are 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 large stroke is obtained. The result is a PBA Press Brake with flexible usage. The 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 PBA series press-brakes are standard equipped with Cybelec DNC 600S Control. Characteristics: - 2D graphic L-angle programming - Blank length calculations - 9" Monochrome LCD - Product/Program transfer - backup (RS232) - User access level with password protection

	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.