Manufacture of die-forged parts from 0.1 to 150 kg – from CAD design and toolmaking to CNC machining, heat treatment and painting.
Erdmann Unternehmensgruppe (Emil Erdmann GmbH)
Hagen · Wetter (Ruhr) · RüthenNew on Amplifa
About us
Founded in 1919, the Erdmann Unternehmensgruppe combines six specialised operations in Hagen, Wetter (Ruhr) and Rüthen for forged parts, CNC machining, heat treatment and industrial painting. In die forging, components with unit weights from 0.1 to 150 kg and part lengths up to 1200 mm are produced; total forging capacity is 14,400 t per year. The value chain includes CAD/CAM design with forging simulation (SolidWorks, QForm), in-house tool and fixture making, CNC turning and milling with over 40 machines, robotic welding to ISO 3834-2 as well as tempering, annealing, induction hardening and water-based wet painting. Materials processed include structural steel, unalloyed and alloyed steels, stainless steels and AFP steel. The components go to rail technology, mechanical engineering, agricultural machinery, construction machinery, commercial vehicles and special fasteners; all manufacturing takes place in Germany, with delivery throughout Europe.
- Site
- Hagen
- Processes
- Die forging, Hot-formed bolts & screws (hot-formed head / upset parts), Press & stamped parts, CNC turning, CNC milling, Cylindrical grinding, Thread rolling, Robotic welding to ISO 3834-2 (EN 15085)
- Materials
- Structural steel, Unalloyed & alloyed steels, Stainless steels, AFP steel
- Certificates
- ISO 9001:2015, EN 15085, ISO 3834-2, DB classification Q1 (rail vehicle parts, commodity group 114), DB classification Q1 track material, HPQ manufacturer-related product qualification track material
- Founded
- 1919
- Industries
- Rail technology/rail transport, General mechanical engineering, Agricultural machinery & equipment, Construction machinery, Commercial vehicles, Special fasteners
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Die forgingForming | – | 1200 mm | 0.1 kg – 150 kg | Small series – Large series | Structural steel, Unalloyed & alloyed steels, Stainless steels, AFP steel |
| Hot-formed bolts & screws (hot-formed head / upset parts)Forming | – | – | – | – | Structural steel, Unalloyed & alloyed steels, Stainless steels, AFP steel |
| Press & stamped partsForming | – | – | – | – | Structural steel, Unalloyed & alloyed steels, Stainless steels, AFP steel |
| CNC turningMachining | – | – | – | – | Structural steel, Unalloyed & alloyed steels, Stainless steels, AFP steel |
| CNC millingMachining | – | – | – | – | Structural steel, Unalloyed & alloyed steels, Stainless steels, AFP steel |
| Cylindrical grindingMachining | – | – | – | – | Steel |
| Thread rollingMachining | – | – | – | – | Steel |
| Robotic welding to ISO 3834-2 (EN 15085)Joining | – | – | – | – | Steel |
| Heat treatment: tempering & annealingHeat treatment | – | – | – | – | metallic die-forged parts |
| Induction hardeningHeat treatment | – | – | – | – | Steel |
| Industrial painting: wet painting & 2K paint systems (water-based)Surface treatment | – | – | – | – | metallic components |
| Tool & fixture making (forging dies)Engineering | – | – | – | – | Steel |
| 3D CAD design & forging simulationEngineering | – | – | – | – | – |
| Quality assurance & metrology (3D scanning, CMM, testing laboratory: hardness testing HB/HV/HRC,Testing | – | – | – | – | – |
11 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Forging lines (hammers) | – | 8 | – | – | Hagen-Haspe |
| Press lines | – | 2 | – | – | Hagen-Haspe |
| Forging lines (hammers 12.5 t) | – | 2 | Part lengths up to 1200 mm | – | Rüthen |
| CNC & 4-axis machines (milling & turning machines) | – | 23 | – | – | Hagen |
| CNC lathes | – | 22 | – | – | Wetter (Ruhr) |
| CNC machining centres (milling) | – | 4 | – | – | Wetter (Ruhr) |
| High & low temperature furnaces (chamber furnaces with transfer system) | – | – | – | – | Rüthen |
| Welding robots | – | – | – | – | Wetter (Ruhr) |
| 3D scanners (optical) | Zeiss | – | – | – | – |
| Coordinate measuring machines (CMM) | Mitutoyo | 3 | – | – | – |
| Tactile/optical measuring machines | Keyence XM | 3 | – | – | – |
Additional services
Reference customers
Company history
- 1919
Founded by master blacksmith Emil Erdmann
- 1985
Acquisition of Volme Schmiede GmbH (forged parts 0.1–10 kg)
- 1990
Takeover of Krimmel (bolts, screws with hot-formed head, turned parts)
- 1992
Takeover of Hammerwerke Haspe (forged parts up to 60 kg, toolmaking)
- 2011
Acquisition of Warsteiner Eisenhammer (large parts up to 150 kg)
- 2014
Foundation of the company's own hardening shop HEG
- 2015
Foundation of the company's own industrial painting shop LEG