On machining centres used for metal processing, workpiece changes frequently involve physically demanding and stressful tasks. Where the machine design exhibits deficits, this process can require adoption of an unfavourable body posture and the handling of heavy loads inside the machine.
The Handtmann HBZ® CompactCell horizontal machining centre possesses a large workpiece pallet that can be inserted into the side of the machine oriented vertically for the purpose of machining. For the loading and retrieval of workpieces, the entire workpiece pallet is folded down through 90°, enabling it to be loaded like a worktable, with easy accessibility.
Standards relevant to milling machines and machining centres can be found on ErgoNoRA by use of the following search terms:
The Technical Report ISO/TR 22100-3 describes how ergonomic principles can be applied during the risk reduction process according to ISO 12100 and how ergonomics standards can be applied to machinery. It helps designers take decisions with respect to ergonomics during the machine design process and can also be used when no relevant type C standards are available.
Heavy loads often have to be handled with the adoption of unfavourable body postures during the loading and retrieval of workpieces into and out of machine tools. Problems with accessibility and the use of load handling equipment often arise particularly inside machines (see also EN 1005-2 and EN 1005-4).
The Handtmann pallet changer for vertical milling machines enables the tool pallets to be separated completely from the machine and placed on carriages in front of the machine. This produces a completely free area for preparing and fixing components. The unobstructed access enables components to be lowered into place from above by lifting gear and fixed by means of clamps at a favourable working height. The freedom for positioning of the interchangeable pallet within the workspace makes the component accessible from all sides (see EN 12417:2009, Section 5.2 and EN 13128:2009, Table 5). Owing to the changer employing two pallets, a workpiece can be machined whilst setup of another workpiece is in progress, thereby reducing the time pressure associated with the task.
Decoupling of machine parts on which manual tasks are to be performed, in the interests of ergonomically more favourable positioning