BSH Cold Forming | Bilstein & Siekermann

Our effective production process provides high precision

The cold forming process – BSH cold forming^® – allows you to produce parts according to specific customer requirements as well as standard parts or standard-like parts. Currently, we apply cold forming to steel and aluminium parts. We can look back on more than 50 years’ experience with this effective production process. It covers the entire process chain starting from the cold-formed blank to the finished product ready for installation component and offers many advantages: We are able to produce formed parts that meet the high standards of our customers with respect to precision, dimensional accuracy and technical cleanliness.

Production of cold formed parts to customer specifications

Reduced consumption of raw materials

High standards of technical cleanliness and dimensional accuracy of components

High process reliability

Our machinery includes four-, five- and six-stage presses with a pressing force of up to 4200 kN and a maximum wire diameter of 30 mm

Compared to conventional machining, cold forming reduces the consumption of raw materials to a minimum. As a comparison: For a similar workpiece, the chip content is 105 g for machining and 9 g for cold forming. This not only saves resources and protects the environment, but also reduces production costs. The cold forming process also creates consolidated, smooth surfaces and favourable internal fibre orientation. Parts with special shaping and tolerance requirements can be produced economically by re-machining the cold-formed blanks.

The cold forming process is secured by BSH as a product brand: BSH cold forming^®.

BSH cold forming^®: Economic manufacture of sliding shoes

Hydraulic motors use so-called sliding shoes that are made of high strength steel and have to withstand extreme loads. To manufacture the large collar diameter as a turned part, the initial diameter of the bar material must be adequately dimensioned; the much thinner shaft results in a high chip content during machining. Since the strength requirements require the use of pre-tempered bar material, the machining process entails considerable costs. BSH has found a more economical approach.

BSH cold forming^®: Pressing valve bodies instead of machining

The pressure inside hydraulic systems must be kept within limits. Load peaks are absorbed with overpressure valves, which usually have machined valve bodies. Free-cutting steels are used to realise machining processes with complex internal geometries efficiently. They contain lead and sulphur additives – which in turn reduces the mechanical load capacity. BSH has solved this problem.