The bending of sheet-metal parts in small to medium batch sizes is still performed for the most part manually on universal bending machines. This may result in workers being subjected to high physical stresses, such as constrained postures or a need for high levels of concentration. Well-engineered ergonomics on the machine can assist in reducing these stresses.
The TRUMPF Trubend 7018 and 7036 bending machines were developed for flexible production of smaller parts. During development, particular consideration was given to user-friendliness. Intelligent design of the machine bed and the fitting of a height-adjustable footrest enable the machine to operated from a seated position. Careful consideration of ergonomic principles during development is also reflected in further details, such as the adjustable display panel and the low-emissions workspace lighting.
[Note concerning property and trade mark rights: EP198789981, EP2362815B1, AT51110781, 000974191]
Standards relevant to bending machines 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.
Work on bending machines requires components to be inserted, held and retrieved. Since the machine is generally rigid, the working height is the same for all workers. Individual adjustment is difficult, leading to many workers adopting unfavourable static body postures.
The bending machines in the Trumpf Trubend 7000 range are designed such that sufficient legroom is provided at the workplace for the task to be performed either standing or with a standing support (see also EN 693:2011, Section 5.8.7 and EN 12622:2014, Section 5.5.3). This effective solution enables the body posture to be alternated and relief to be provided for the legs. In order to ensure a healthy body posture for persons of different height, a footrest is fitted that can be adjusted to the desired height by means of a simple mechanism assisted by a gas strut (see EN ISO 14738:2009, Section 8).
Adaptation of the machine geometry to support different work positions
Differences in the height or working position of operators lead to fixed display elements being viewed at different viewing angles. This can give rise to reflection, glare, or poor contrast on the display. Users often compensate for this by changing their body posture; during prolonged monitoring or adjustment tasks, this results in unfavourable static body postures.
The control panel on the Trumpf Trubend 7000 range consists of a touch display in which display and control elements are combined. Owing to the high installation height, the display can be angled downwards in order to attain the ideal viewing axis from a range of different heights, for example when the operator switches from standing to sitting (see EN 894-2:2009, Section 4.1.1; EN 894-4:2010, Sections 188.8.131.52 and 184.108.40.206 and Annex A; EN 61310-1:2008, Section 4.2.2). The changes in angle also enable glare effects caused by ambient lighting to be avoided without the worker having to change his or her body posture (see EN 894-2:2009, Section 4.1.3).
Manual tasks performed during the loading and adjustment of bending machines often entail dexterous operations and a high degree of precision. In order for these to be assured, the work area must be lit fully and effectively. However, conventional lighting of adequate illuminance may also radiate considerable heat to which the worker is exposed, in addition to the light. The required illuminance may also differ according to the ambient light levels, particularly during shift working.
The LED lighting of machines in the Trumpf Trubend 7000 range illuminates the entire working area without emitting additional heat. Furthermore, the control system enables the illuminance to be adjusted to the instantaneous ambient conditions (EN 693:2011, Section 220.127.116.11; EN 12622:2014, Section 5.5.3; EN 1837:2009, Section 4.7). This creates a pleasant working atmosphere, reduces stresses, and avoids high contrast between the workspace and the environment.