Development and manufacture of rubber-metal components, spring elements and air spring systems for vibration technology.
GMT Gummi-Metall-Technik GmbH
Bühl (Headquarters) · Bühl (Rubber Compounding) · Bühl (Air Spring Systems) · Sangerhausen · Arujá/São Paulo (BR) · Florange (FR) · Bidadi/Bangalore (IN) · Clifden (IE) · Kuala Kangsar (MY) · EbikonNew on Amplifa
About GMT Gummi-Metall-Technik
GMT Gummi-Metall-Technik GmbH was founded in 1968 in Bühl and, as a family-run group of companies, specialises in vibration technology solutions. The company develops and manufactures rubber-metal components, spring elements, rubber moulded parts, elastomer compounds and complete air spring systems for vibration damping, decoupling and elastic mounting. Manufacturing includes its own rubber compounding facility, the vulcanisation of elastomer onto steel or stainless steel metal bodies, and the assembly of systems. This is complemented by FEM simulation with hyperelastic material parameters, FKM strength verification, service life testing on hydraulic test rigs, failure analysis, component optimisation and remanufacturing of rubber-metal parts. The main customer industries are rail vehicles, protection and defence technology, off-highway, machinery and drive technology, shipbuilding, renewable energies, infrastructure, commercial vehicles as well as screening and conveying technology. With more than 1,100 employees, the group is represented worldwide with production and sales locations in Germany, Brazil, France, India, Ireland, Malaysia, Switzerland, the United Kingdom and the USA; the headquarters are located in Bühl (Baden-Württemberg).
- Site
- Bühl
- Processes
- Rubber-metal bonded manufacturing (vulcanisation of rubber onto metal), Rubber compounding (compound production), Manufacture of rubber moulded parts, Air spring system production, FEM calculation / simulation (with hyperelastic material parameters, multi-axial, FKM guideline strength verification for metal components, Service life testing (single- and multi-axial dynamic service strength tests on hydraulic, Failure analysis (material and laboratory analyses, hardness and elasticity measurement,
- Materials
- Elastomer/rubber (custom compounds), Steel, Stainless steel, Maschinenfuß-Triflex-2 rubber, Machine foot rubber, Rubber bearing, cup element rubber, Rubber-metal vulcanisation
- Certificates
- ISO 9001:2015, ISO/TS 22163 (IRIS), DIN EN ISO 14001:2015, DIN EN ISO 50001:2018, DNV Type Approval (machine feet/flexible mounts), EN 15085-2, AEO authorisation, ISO 14001, ISO 50001, DNV Type Approval, AEO
- Founded
- 1968
- Employees
- >1100
- Industries
- Rail vehicles, Protection and defence technology, Off-highway (construction and agricultural machinery), Mechanical engineering & drive technology, Shipbuilding, Renewable energies (wind power)
- 01
Material development (elastomer compounds)
- 02
Rubber compounding (mixing facility)
- 03
Metalworking/component manufacturing
- 04
Vulcanisation of rubber-metal bond
- 05
Moulded part and air spring system manufacturing/assembly
- 06
Test rig trials and service life testing
- 07
Delivery and remanufacturing
Materials & Processes
Elastomer/rubber (custom compounds)
Individually developed elastomer compounds with defined damping and stiffness properties, among others in Shore hardnesses from 40 to 70.
Steel
Load-bearing metal bodies for rubber-metal bonded elements, e.g. machine feet and mounting elements.
Stainless steel
Corrosion-resistant metal bodies for maritime applications such as machine feet in shipbuilding.
Rubber-metal vulcanisation
Firmly vulcanised rubber layers on metal bodies for highly loadable vibration damping.
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Rubber-metal bonded manufacturing (vulcanisation of rubber onto metal)Joining | – | – | – | – | Rubber/elastomer, Steel, Stainless steel |
| Rubber compounding (compound production)Plastics | – | – | – | – | Elastomer compounds |
| Manufacture of rubber moulded partsPlastics | – | – | – | – | Rubber |
| Air spring system productionAssembly | – | – | – | – | Elastomer, Fabric, Metal |
| FEM calculation / simulation (with hyperelastic material parameters, multi-axialEngineering | – | – | – | – | – |
| FKM guideline strength verification for metal componentsEngineering | – | – | – | – | Metal |
| Service life testing (single- and multi-axial dynamic service strength tests on hydraulicTesting | – | – | – | – | – |
| Failure analysis (material and laboratory analyses, hardness and elasticity measurement,Testing | – | – | – | – | – |
| Component optimisation (field measurement, load collectives, damage calculation, dynamicEngineering | – | – | – | – | – |
| Remanufacturing of rubber-metal components and air spring systems (disassembly, testing,Assembly | – | – | – | – | Rubber, Metal |
| Fatigue tests to determine compound-specific material parametersTesting | – | – | – | – | Elastomer |
| Manufacture of rubber-sprung wheels (wheel suspension with rubber bodies, spring discs, rubberJoining | – | – | – | – | Rubber, Metal |
Additional services
Reference customers
Quality & Certification
Quality management is preventive, transparent and geared towards continuous improvement, and is evidenced by certified systems (ISO 9001, ISO/TS 22163, ISO 14001, ISO 50001, EN 15085-2, DNV Type Approval, AEO). The in-house testing laboratory carries out single- and multi-axial service strength tests on hydraulic test rigs, creep tests, hardness and adhesion tests as well as material-analytical investigations.
| Evidence | Bühl |
|---|---|
| ISO 9001:2015 | |
| ISO/TS 22163 (IRIS) | |
| ISO 14001 | |
| ISO 50001 | |
| EN 15085-2 | |
| DNV Type Approval | |
| AEO |
History
- 1968
Founded by Gerhard and Atina Engstler in Bühl.
- 1975
First foreign subsidiary: production plant in Ireland (Clifden).
- 1990
Expansion of production in Bühl; further expansions in 1995, 2001, 2006, 2011, 2015 and 2021.
- 2006
Establishment of a production site in India (Bidadi/Bangalore).
- 2015
Fines from the Federal Cartel Office for price fixing on chain buffers (period 2010–2014, together with other companies).
- 2019
Start of production in Sangerhausen (GMT Produktion GmbH).
- 2022
Revenue shares according to Wikipedia: rail vehicles 56 %, mechanical engineering 34 %, aviation 10 %.