Anaesthesia equipment trolley chassis
What GPE puts on its feet plays a supporting role in the operating room.
As part of a tightly organised project with the customer, GPE tested a wide range of materials and production technologies and defined these according to their optimum feasibility for subsequent mass production. A central requirement was designing under application of the geometric dimensioning and tolerancing guidelines specified in the prevailing metalworking standards.
This resulted in specific challenges with respect to the welded design – the components of the chassis are laser-cut from 3 to 4 mm thick sheet steel panels, deburred and edged. The castor mountings for the Steinco castors mounted during a later step are cut and milled from tubes and welded by means of robotic welding to the tightest tolerances. The customer specified a tolerance of ±0.8 mm with a distance of 650 mm between the castor mountings and a parallelism of 0.5 mm between the individual parts. The scope of the project also included surface finishing after welding the entire assembly to prevent rust formation (pickling, electrogalvanisation).
A state-of-the-art press brake with bending angle monitoring (ACB) in combination with a bending robot ensures the accuracy of the edging process – this minimises errors in the initial stages of production and ensures the desired level of quality is achieved. During robot welding of the individual parts, special retaining jigs are used to counteract the distortion during welding resulting from the process. GPE designed these specifically for this project in accordance with customer requirements and the applicable tolerances and standards.
The Added Value
The customer achieves maximum engineering value with respect to the system assembly of the entire carriage (chassis), because in this case the most important aspect is the interaction of the wide variety of materials and component tolerances in each drawing. If the chassis is not within tolerance (straight, horizontal), dimensional deviations from the backbone (extruded aluminium profile) and with regard to the further assembly of mounted parts such as the two tables (die-cast aluminium parts) increase. These are aligned centrally to the backbone using our own assembly jig. CAQ-controlled documentation is carried out for all components and production steps up to the final inspection (including high-voltage testing). Each chassis is assigned a serial number, which enables all of the materials used to be traced. GPE delivers the quantities required by the customer in a highly responsive manner to its VMI warehouse. The fractal structures in the assembly lines enable us to respond quickly to fluctuations in customer orders, for example as a result of the coronavirus pandemic.
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