Welded, straightened and machined components are joined at Bock into the complete assembly – aligned, measured and handed over ready for dispatch. Pre-assembly, partial or complete assembly as agreed, at our Lorch plant — Ostalbkreis, Stuttgart region, southern Germany.
2×25 t overhead travelling crane in tandem operation – components from a few kilograms up to 50 t are handled and positioned.
Certified for the execution of load-bearing steel components, plus EN ISO 3834-2 and DIN EN ISO 9001:2015.
Six welding turning rolls for cylindrical components from Ø 150 to 7,500 mm, four welding and assembly positioners, one load turning device.
Assemblies are aligned before final joining and measured with calibrated measuring and test equipment; dimensional reports project-specific.
Pre-assembly, partial assembly or complete component assembly – the scope of supply is defined before the order is placed.
Cutting, welding, straightening, machining, blasting and painting on 14,000 m² at one site.
By component assembly we mean joining finished individual parts into a complete assembly: welded components, machined parts, plates, sections and standard parts are brought together to drawing and parts list, aligned, measured and secured.
Assembly takes place at our plant in Lorch. Crane systems, welding turning rolls, positioners and the downstream operations machining, straightening, blasting and painting are all in the same building – between the steps the assembly changes the bay, not the company.
Joining is done by bolting, pinning and welding: bolted connections with threads from M2 to M60, pin and articulated joints, bearings and bearing seats. Interference-fit joining, in which the shaft is sub-cooled before insertion, is carried out project-specifically by agreement.
The normal case is an order with our own manufacturing share: we produce the load-bearing parts ourselves and integrate customer-supplied add-on parts, bought-in components and sub-assemblies built by us into the assembly. Which parts you supply and which we manufacture is defined before the order is placed.
We assemble from batch size 1. Single items, prototypes, assemblies and small batches are handled alike; there are no minimum quantities.
Steel fitting and jig building – adapting, drilling, tapping, deburring as well as building clamping, welding and assembly aids – are the craft basis of this assembly and are described on a separate page.
How far the assembly goes is defined per order. Three levels are common:
Whether an assembly is delivered pre-assembled, partially assembled or fully assembled is set out in the order. Our prices are ex works Lorch; installation and commissioning at the customer's site are not included and require an express agreement.
Whether a heavy steel assembly can be assembled is decided before the first connection – by the question of whether the component can be held in joining position, aligned and re-measured. Permanently installed equipment is available in Lorch for exactly that:
This brings every joint into an accessible position instead of having to make it overhead or in a constrained position. On heavy assemblies this determines dimensional accuracy and the weld quality of the subsequent welding work.
Whether an assembly goes together is decided before assembly – at bearing seats, fitting holes and connection faces. At Bock these faces are produced on CNC horizontal boring mills with 3,500 mm × 2,500 mm × 1,200 mm travel and a 360° rotary table, on the vertical turning lathe up to Ø 4,800 mm and on the gantry milling centres up to 26 m component length.
We produce hole patterns and fastening threads from M2 to M60 with radial drilling machines with up to 3,000 mm reach, even far inside large-area components – where later rework on the assembled unit would no longer be accessible. We also carry out rework and drilling on bought-in or customer-supplied components.
Testing takes place before the unit goes into assembly: visual testing, penetrant testing and magnetic particle testing by our own inspectors to DIN EN ISO 9712 (Level 2) directly in the plant, without external scheduling chains. Because machining and assembly are in the same company, a deviation can still be corrected in the setup instead of being compensated for in the assembly.
What happens after assembly is defined with the order. These steps are available in-house and can be integrated into the assembly:
The scope of supply is defined before the order is placed: you receive the assembly raw-joined, tested, coated or packed ready for dispatch. Delivery ex works Lorch or carriage paid.
Certified welding contractor for load-bearing steel structures – qualified up to Execution Class EXC3.
DVS ZERT · Zertifizierungsstelle des DVS download as PDFComprehensive quality requirements for fusion welding of metallic materials.
DVS ZERT · Zertifizierungsstelle des DVS download as PDFCertified quality management system – full process traceability and audit-ready documentation.
TÜO · Technische Überwachungsorganisation für Sicherheit, Qualität und Umweltschutz GmbH download as PDF1 / 3
Bock Maschinenbau is certified for the execution of load-bearing steel components to DIN EN 1090-2, execution class EXC3 (certification body DVS ZERT), and meets the quality requirements for fusion welding to DIN EN ISO 3834-2. The scope of the standard is the execution – it does not end at the individual weld but covers the joined component. Complemented by certified quality management to DIN EN ISO 9001:2015, this is the framework in which load-bearing assemblies are assembled at Bock. For clients with a documentation obligation, the current certificates are available as PDFs.
On an assembled unit it is not only the individual weld that counts, but also the position of the parts relative to one another. Alignment and dimensions are therefore checked on the component before it is finally connected. Depending on component, material, weld class and customer specification, visual inspections and non-destructive test methods are additionally used.
This covers surface indications, cracks, near-surface irregularities and internal irregularities in suitable components and weld joints.
Testing and documentation requirements are agreed project-specifically to drawing, standard requirement and customer specification. We provide material certificates and inspection certificates on request or in accordance with the project requirement.
At Bock we mainly assemble heavy, multi-part assemblies from steel, crane and plant engineering:
We handle repair and conversion work on existing steel structures separately – there the condition survey comes first, not the parts list.
Three views into assembly: a rotary kiln on the welding turning rolls – the red indications on the welds come from the penetrant testing carried out on the component before further build-up – and the same component twice, the drum shell before assembly with its turned outer surface, hole pattern and flange bolt circle, and after assembly and painting completed with ring gear, bearing block and base plate.
Four views of an interference-fit joining operation: the sub-cooled, frost-covered shaft on the crane hook above the rope drum, the closed layer of frost with the key inserted, the entry into the hub bore – and the joined shaft in the primed drum end plate. A process we carry out project-specifically by agreement.
Bock has been manufacturing in Lorch for 63 years and assembles where the welding and machining is done:
Send us your enquiry for contract manufacturing, structural steel or custom machinery — we'll get back to you promptly.
For an initial assessment we need a drawing or 3D model as PDF, STEP or DXF, plus parts list, materials, component weight and the desired assembly depth. In addition, details of testing, documentation and shipping requirements as well as the delivery date. We check the manufacturing and assembly options and prepare a non-binding quotation.
