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Comebo Industries welds complex chassis in very small series

Comebo Industries has chosen Valk Welding as their partner for their current and future investments in robotic welding of large chassis. This resulted in the installation of a welding robot in 2020 and another in 2024.

We are located in Clazay, a village that is part of the municipality of Bressuire, situated 35 kilometres southeast of Cholet.
In this green landscape, Comebo Industries has built its reputation. “The Coopérative Métallurgique du Bocage was founded in 1970 in Bressuire by seven founding partners. From the beginning, the company focused on welding with a clientele of large industrial companies,” recalls Jérôme Mathieu, CEO of Comebo Industries.

The activities of the cooperative production company (Scop), where the sixty employees are also shareholders, nowadays revolve around sheet and bar processing (laser cutting, drilling, bending, rolling...), welding (manual MAG welding, robotic welding, and spot welding), and painting. The company produces chassis and other structural elements - robust parts consisting of dozens of components, sometimes even 200 or 300 for certain references - for agricultural machinery, warehouse equipment, lifts, airport equipment, etc., which are sold worldwide.

Comebo Industries invested in robotic welding more than two decades ago. “However, we were faced with the ageing of two of our five machines, which have been operational since 1999, leading to a loss of original precision. Besides restoring the original capabilities, we also wanted to take the opportunity to modernise the machinery,” emphasises Jérôme Mathieu. Thus, the company chose Valk Welding in 2019 for a first welding robot, followed by a second installation in 2024.

“Offline programming is an important criterion for us, as we cannot afford to have the robot idle for three to five weeks to realise the programme for the most complex parts.”

Jérôme Mathieu, CEO of Comebo Industries:

Expanding capabilities to 5 metres

One of the arguments in favour of Valk Welding is that they are specialists in welding and can provide advice on how a particular part should be welded, rather than just acting as equipment sellers. As a family business, the manufacturer has a long-term strategy and an identity close to that of Comebo Industries. The historical partnership between Panasonic and Valk Welding also played a significant role in the decision, as it guarantees strong integration and deeper exploitation of the welding source and the robot.

The first installation has a suspended robot with a gantry, to optimise the depth of the space. “Because the machine is near an entrance, there had to be enough space left for passage,” says Jérôme Mathieu. Another advantage of this robot is better accessibility of the torch, allowing it to access tight spaces from above. The second welding robot installation is a TRACK-FRAME-E.

These solutions distinguish themselves from the previous machines by options that ensure the weld seams are correctly positioned and compliant (wire searching, seam tracking). Because the parts are manually tacked in a jig using tack welding, there are small deviations, albeit within tolerances. Without these options, along with those of the cutting or bending processes, these deviations could affect the repeatability and compliance of the robotic welding.

Thanks to this investment, Comebo Industries was able to meet the demand to produce even larger parts. “We were limited to 3.2 metres, whereas we can now go up to 5 metres with the first installation and 4.1 metres with the second. The first machine even allowed us to integrate a new complementary product that we previously could not make,” explains Jérôme Mathieu.

Besides the near-complete elimination of post-processing (removing splatter, repairing welds...) thanks to the now clean and precise welds, there was one last factor that influenced the choice for Valk Welding. “The offline programming was more advanced than with the other manufacturers consulted, and Valk Welding invests heavily in this subject. This is an important criterion for us, as it takes three to five weeks to realise the programme for the most complex parts and we cannot afford to have the robot idle for that long,” explains Jérôme Mathieu.

www.comebo.fr

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