Turned parts, nuts and fasteners made to drawing from Ø20 to 800 mm in steel, stainless steel and special materials.
David Dorfmüller Söhne GmbH & Co. KG
RemscheidNew on Amplifa
About Dorfmüller
David Dorfmüller Söhne is an owner-managed mid-sized contract manufacturer and fastener producer in Remscheid with a tradition dating back to 1884. The company produces custom and standard-made components such as knurled nuts, washers, screws, rings, flanges and shafts to drawing as well as standard turned parts. The manufacturing processes include CNC turning (including large-part turning up to Ø800 mm, 1000 mm length and 1000 kg piece weight), vertical pick-up turning for large series up to 20,000 pieces, five-axis milling, surface grinding, vibratory finishing, sawing, electrical discharge machining, laser marking and heat treatment (quenching and tempering). Materials processed include heat-treatable steels, stainless steels, free-cutting steels, hot-work steels for high- and low-temperature applications, Inconel alloys, aluminium, brass and copper alloys, stored batch-clean and fully traceable. Customers include shipbuilding, wind power, rail/railway technology, the energy sector (gas and steam turbines), gearbox manufacturing, mechanical engineering and offshore; shipments go to more than 30 countries.
- Site
- Remscheid
- Processes
- Sawing (cutting to size / contract sawing), Turning (universal, CNC), Turning of large parts, Turning large series (vertical pick-up turning), Turning small series (universal CNC lathes), Milling (machining centres), Five-axis milling (3+2 and 5-axis simultaneous), Surface grinding
- Materials
- St 52-3, C15, 16MnCr5, C45, C60, 42CrMo4, 50CrMo4, 50CrV4
- Certificates
- DIN EN ISO 9001:2015, AD 2000 Merkblatt W0 / DGRL 2014/68/EU, Green electricity certificate, Green gas certificate, Acceptance inspection certificate 3.1 (EN 10204), Acceptance inspection certificate 3.2 (EN 10204), 3D coordinate metrology
- Founded
- 1884
- Employees
- 60
- Industries
- Shipbuilding, Wind power, Railway/rail technology, Energy (gas and steam turbines), Gearbox manufacturing, Mechanical engineering
- 01
Raw material warehouse (480 t)
- 02
Sawing / cutting to size
- 03
Heat treatment (quenching and tempering)
- 04
CNC turning
- 05
Milling
- 06
Grinding
- 07
Surface finishing (vibratory finishing, laser marking)
- 08
Testing and metrology
- 09
Shipping
Materials and Processes
St 52-3
General structural steel for welded and stressed steel structures.
42CrMo4
Heat-treatable steel for highly stressed shafts, nuts and gear parts.
34CrNiMo6
Ni-Cr-Mo heat-treatable steel for components with high core toughness and fatigue strength.
X5CrNi18-10 (A2)
Rust-free austenitic stainless steel for corrosion-stressed fasteners.
X2CrNiMo17-12-2 (A4)
Acid-resistant stainless steel for marine and offshore applications.
X2CrNiMoN22-5-3 (Duplex)
Duplex steel for the highest corrosion and tensile strength requirements.
X22CrMoV12-1
Steel for steam turbine and high-temperature use according to EN 10269.
X6NiCrTiMoVB25-15-2
Heat-resistant special material for bolted connections at elevated temperatures.
NiCr19Fe19Nb5Mo3 (Inconel 718)
Nickel-based alloy for demanding applications in turbine and plant engineering.
AlMg4,5Mn (AW5083)
Corrosion-resistant aluminium for lightweight construction applications.
CuZn39Pb3 (CU3)
Brass alloy for machining with good bar-turning behaviour.
CuAl10Ni5Fe4 (CU7)
Aluminium brass for wear- and corrosion-stressed components.
Locations
Remscheid
DEHeadquarters and manufacturing
- Part weight / size
- up to 1000 kg piece weight
- Lot size
- Lot size 1 – 20,000
- Materials
- Steels, stainless steels, free-cutting steels, high-/low-temperature steels, Inconel, aluminium, brass, copper
- Zeiss Contura G2 RDS 3D coordinate measuring machine
- 5× Kasto Tec AC5 NC band saw (Ø20–520 mm)
- Gildemeister CTX Beta 800 (Ø250 mm)
- Gildemeister CTX Gamma 1250 (Ø800 mm, 1000 mm length)
- CTV 250 pick-up turning machine (Ø400 mm)
- CTX 410 universal CNC lathe
- Brother S1000X machining centre (Ø200 mm)
- DMG MORI DMF 260 5-axis milling machine (Ø800 mm)
- G&N MPS surface grinding machine (Ø400 mm)
- Walter Trowal vibratory finishing system (Ø150 mm)
Components
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Sawing (cutting to size / contract sawing)Machining | – | ∅520 mm | – | 1 | Steels, Special materials |
| Turning (universal, CNC)Machining | – | ∅250 mm | – | 1 | Heat-treatable steels, Stainless steels, Aluminium, Copper alloys |
| Turning of large partsMachining | – | 1000 mm × ∅800 mm | 1000 kg | – | Steels, Special materials |
| Turning large series (vertical pick-up turning)Machining | – | ∅400 mm | – | 50 – 20000 | Steels |
| Turning small series (universal CNC lathes)Machining | – | – | – | 1 | Steels |
| Milling (machining centres)Machining | – | ∅200 mm | – | – | Steels |
| Five-axis milling (3+2 and 5-axis simultaneous)Machining | – | ∅800 mm | – | – | Steels, Special materials |
| Surface grindingMachining | – | ∅400 mm | – | – | Steels |
| Vibratory finishingSurface | – | ∅150 mm | – | – | Metals |
| Laser markingSurface | – | – | – | – | – |
| Electrical discharge machiningMachining | – | – | – | – | Metals |
| Quenching and tempering (heat treatment)Heat treatment | – | – | – | – | Heat-treatable steels |
| Measurement (3D coordinate measurement)Testing | less than 0.005 mm | – | – | – | – |
| Ultrasonic testingTesting | – | – | – | – | – |
| Hardness testingTesting | – | – | – | – | – |
| Tensile and impact testingTesting | – | – | – | – | – |
| Magnetic particle crack testingTesting | – | – | – | – | – |
| Spectral analysisTesting | – | – | – | – | – |
| Proof load testingTesting | – | – | – | – | – |
| Expansion testingTesting | – | – | – | – | – |
| Manufacture of custom and drawing parts (nuts, washers, screws, rings, shafts)Machining | – | 2000 mm × 800 mm | 1000 kg | 1 – 10000 | Steels, Non-ferrous and light metals, Special materials |
10 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| 3D coordinate measuring machine | Zeiss Contura G2 RDS | – | – | – | Remscheid |
| NC band saw | Kasto Tec AC5 | 5 | ∅20 to ∅520 mm | – | Remscheid |
| CNC universal lathe | Gildemeister (DMG) CTX Beta 800 | – | up to ∅250 mm | – | Remscheid |
| Large turning lathe | Gildemeister (DMG) CTX Gamma 1250 | – | up to ∅800 mm, 1000 mm length | – | Remscheid |
| Vertical pick-up turning machine | CTV 250 | – | up to ∅400 mm | – | Remscheid |
| Universal CNC lathe | CTX 410 | – | – | – | Remscheid |
| Milling machining centre | Brother S1000X | – | up to ∅200 mm | – | Remscheid |
| 5-axis milling machine | DMG MORI DMF 260 | – | up to ∅800 mm | – | Remscheid |
| Surface grinding machine | G&N MPS | – | up to ∅400 mm | – | Remscheid |
| Vibratory finishing system | Walter Trowal | – | up to ∅150 mm | – | Remscheid |
Additional services
Quality
Quality assurance includes more than 2000 measuring and testing devices, including a Zeiss Contura G2 RDS 3D coordinate measuring machine for tolerances below 0.005 mm as well as in-process measuring systems on production machines. Testing methods such as ultrasonic, hardness, tensile, impact and magnetic particle crack testing as well as spectral analysis and acceptance inspection certificates according to EN 10204 (3.1/3.2) ensure batch traceability back to the melt.
| Evidence | Remscheid |
|---|---|
| DIN EN ISO 9001:2015 | |
| AD 2000 Merkblatt W0 / DGRL 2014/68/EU | |
| Acceptance inspection certificate 3.1 (EN 10204) | |
| Acceptance inspection certificate 3.2 (EN 10204) | |
| 3D coordinate metrology |
History
- 1884
Founded by David and Friedrich Dorfmüller as a small forge for twist drills and hand tools in Remscheid.
- 1905
Move into the new production hall in Remscheid-Hasten; the four sons Walter, David, Hugo and Robert join the company.
- 1918
Renaming to David Dorfmüller Söhne; expansion of the product range to include woodworking tools, fretsaw machines and band saw blade guides.
- 1948
First own nut production, patent of the band saw blade guide "Diva" and first knurled nut W40 x 1/20.
- 1965
Takeover of the manufacturing operations of Clemens Tschöpe in Remscheid-Hasten; focus on knurled nuts and cross-drilled nuts.
- 1979
Takeover of the production of electric magnetic tooth clutches from Richard Hofheinz & Co. in Haan; purchase of the first CNC lathe.
- 1986
New building at the current location on Dreherstraße in Remscheid-Lüttringhausen; closure of the two previous sites.
- 1994
Initial certification according to ISO 9001.
- 2002
Michael Hake and Klaus Dorfmüller become managing directors alongside Wolfgang Dorfmüller.
- 2006
Lucas Dorfmüller joins; 5th generation of the Dorfmüller family in the company.
- 2018
Transition of the QM system to ISO 9001:2015.