Vollmer’s CHX840/HS automated CNC machine is capable of sharpening the tooth face and top of circular saw blades in a single set-up, with continuous unmanned running. The company has developed this model in line with the requirements of sharpening specialists and manufacturers that continuously re-sharpen circular saws. Suitable for machining carbide-tipped circular saw blades with a diameter up to 840 mm, the CHX840/HS is complemented by another machine for manufacturers producing larger saw blades up to 1,300 mm diameter, the CHX1300.
With five CNC-controlled axes, the CHX840/HS can machine saw blades with all common tooth geometries, which also applies to axial angle and group toothing. The CHX840 machine at MACH will be connected to Vollmer’s HS automation solution, hence the CHX840/HS designation.
The HS system ensures automatic loading of the CHX840, so end users can benefit from more than seven hours of unmanned operation. Programming and preparation of the saw blade stack can be undertaken during machine operation and, with a saw blade stack height of up to 180 mm, the HS automatic machine loading system can hold up to 25 circular saw blades. As saws are stacked with intermediate layers, tooth breakages and blade damage can be avoided.
Vollmer’s CHX840/HS is able to accommodate saw blades with a bore diameter up to 80 mm, and is generally specified for saw blades with an outer diameter from 140 to 530 mm. Credit to a double grinding wheel configuration, the sharpening of tooth face and top is conducted in a single set-up. A transverse feed pawl with pneumatic lifting also permits the machining of clamping segments and clamping rings.
The operating concept of the CHX840/HS is based on the Vollmer multi-function hand-wheel that facilitates the selection and movement of axes, which in turn avoids operating errors. Machining times and surface quality can be improved with variable input of the grinding speeds during the sharpening process.
Alongside the CHX840/HS at MACH will be the Loroch Evolution K850-M for the production of metal-cutting saw blades. Incorporating a 19” touchscreen CNC, the K850-M enables blades to be programmed in minutes with data input directly at the machine via the colour display. Suitable for processing HSS saws, solid-carbide saws and friction saw blades, the Loroch Evolution K850-M has a direct-drive grinding wheel configuration that reduces power loss and eliminates undesirable vibration that can impact blade quality.
Capable of both manual and automatic processing, users can load saw blades from 130 to 520 mm diameter to the arbor in random order as required (blades up to 850 mm diameter can be loaded manually). To achieve this automated concept with differing bores, reducing rings can be used to create a common size. Furthermore, the K850-M uses its automatic loading function to process the blades without the need for manual sorting. Featuring eight CNC controlled axes, flexibility is assured, with just one clamping flange required for blades from 130 to 850 mm diameter.
