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By deploying Siemens servo motors and controls, HMK has developed an end-of-line flying shear crosscut and sheet-stacking system for CM Machinery.

The equipment is to form part of a GBP500,000 multi-functional plastic extrusion line for a Swiss manufacturer.

HMK, part of the Entologi Group, is an independent UK supplier of motion and engineered drive components to OEMs and factory-automation integrators.

It is Siemens’ Technology Partner for motion and engineered drives and solutions.

This application required a high level of flexibility to cater for the different products that were to be made on the line.

In addtion, close integration was required between the processing stations on the line, so that fast machine set-up times could be achieved.

The Siemens motion control system had the flexibility and visibility to provide for these needs.

Mike Jordan, a Simotion programmer at HMK, has been able to create a flexible system with a MP377 operator interface, which allows easy alteration of programmes and products with the simple addition of presets.

Material will be fed down the new production line in a continuous 2.5m-wide board.

A trim station, featuring motorised circular saws, cuts the product to finished widths and trims off the outer edges.

This is followed by a travelling crosscut with a controller that allows it to move at the same speed as product when performing crosscuts.

Accuracy in length cutting is critical, therefore tight tolerance control of the cutting axes has been essential in ensuring the boards meet final customer requirements.

The finished boards are then transferred out of the cutting area by motorised horizontal conveyors, in a pre-determined pattern that allows them to be lifted by an overhead vacuum frame and placed neatly onto pallets for final packing and despatch.

The stacker frame operates with two servo axes, enabling the boards to be lifted from the transport conveyor and moved to one of two stacking tables, giving an offloading facility while the line continues to operate.

The machine is fitted with a number of ET200S remote I/O stations.

CM Machinery built all the hardware for this triple function machine.

The end user placed great emphasis on safety, so HMK was specified to design safety zoning onto each of the machine’s separate functions.

Another specified requirement was the ability to change any of the servomotors during normal maintenance in one of the safety zones while the other safety zones remained operational.

This feature was successfully developed, tested and accepted by the final end user.

Northern Ireland-based CM Machinery has been working with HMK for several years designing and building multi-functional machine tools for use with multi-national manufacturers across Scandinavia and Northern Europe.

Their machines generally operate on a 24-hour duty cycle.

Controlling all motion and machine sequence control on the machine is the Simotion D435 motion control system.

It integrates motion control and control functionality into one unit and was specifically designed for applications with complex movements.

Simotion D combines the complex operation of motion functions into a scalable motion control system for various hardware platforms, thanks to a common engineering system, allowing considerably more flexibility for machine planning and construction.

CM Machinery has met its customer’s delivery timescale for the supply of the bespoke end of line equipment and it will become operational later this month.

HMK Automation and Drives

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