Manufacturing and machining of tungsten carbide rods, cut-to-length blanks and sintered special parts for precision and cutting tools.
HHT – Hartmetall GmbH & Co. KG
DornstadtNew on Amplifa
About HHT-Hartmetall
HHT-Hartmetall GmbH & Co. KG is a specialised manufacturer and supplier of tungsten carbide based in Dornstadt near Ulm. For over 50 years the company has produced its own carbide grades using powder metallurgical processes and supplies rods in as-sintered and ground condition, solid carbide rectangular and square bars, EDM blocks, polished balls and cermet rods. In addition, HHT offers machining services such as centreless grinding (Ø 0.1–100 mm), cut-to-length blanks (Ø 0.5–40 mm), chamfering, Weldon flats to DIN 6535 forms HB and HE (Ø 6–32 mm) and stepping of individual contours. Sintered special parts such as bushings, dies, rings, draw dies, mechanical seal rings, nozzles and valve seats are manufactured to drawing. Customers include manufacturers of precision and cutting tools, the machining industry, wear protection and the plastics industry. The main carbide product range is almost entirely available from stock; orders placed by 15:00 are shipped the same day subject to availability.
- Site
- Dornstadt
- Processes
- Centreless grinding of carbide rods, Round grinding (cylindrical grinding) of carbide rods, Cutting/parting of carbide rods to desired length (cut-to-length blanks), Chamfering / end machining of cut-to-length blanks, Flat milling to DIN 6535 / forms HB and HE (Weldon), Coolant channel connectors – tips – radii, Individual contours precisely stepped (carbide blanks for step drills, mills,, Sintered special parts to drawing specifications (as-sintered, ground, finely ground,
- Materials
- Tungsten carbide (Tungsten Carbide, WC-Co), Tungsten carbide (wear grades), Cermet
- Certificates
- DIN ISO 9001:2015, ISO 9001
- Founded
- 1973
- Industries
- Manufacturers of precision and cutting tools, Machining industry, Wear protection (forming, drawing and stamping tools), Plastics industry, Manufacturers of precision and cutting tools (machining), Wear protection (forming tools, drawing and stamping tools)
- 01
Powder metallurgical production of carbide grades
- 02
Sintering of rods, semi-finished products and special parts
- 03
Cut-to-length/parting to desired length
- 04
Centreless grinding and cylindrical grinding
- 05
Chamfering and flat milling to DIN 6535
- 06
Stepping of individual contours
- 07
Quality inspection and shipping from stock
Location
Dornstadt
DEHeadquarters, production and warehouse
- Part weight / size
- Ø 0.1–100 mm (round grinding), Ø 0.5–40 mm (cut-to-length)
- Lot size
- Stock programme and special parts to drawing
- Materials
- Tungsten carbide (WC-Co), cermet
- Grinding and machining machines for tungsten carbide
- Expansion of the machine fleet in 2018
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Centreless grinding of carbide rodsMachining | – | – | – | – | Tungsten carbide (hard metal), Cermet |
| Round grinding (cylindrical grinding) of carbide rodsMachining | Best concentricity and precision | Ø 0.1 to Ø 100 mm | – | – | Tungsten carbide (hard metal) |
| Cutting/parting of carbide rods to desired length (cut-to-length blanks)Machining | dimensionally accurate | Ø 0.5 to Ø 40 mm | – | – | Tungsten carbide (hard metal) |
| Chamfering / end machining of cut-to-length blanksMachining | – | – | – | – | Tungsten carbide (hard metal) |
| Flat milling to DIN 6535 / forms HB and HE (Weldon)Machining | – | Ø 6 to Ø 32 mm | – | – | Tungsten carbide (hard metal) |
| Coolant channel connectors – tips – radiiMachining | – | – | – | – | Tungsten carbide (hard metal) |
| Individual contours precisely stepped (carbide blanks for step drills, mills,Machining | Ultra-precise | Ø 0.1 - 50 mm | – | – | Tungsten carbide (hard metal) |
| Sintered special parts to drawing specifications (as-sintered, ground, finely ground,Casting | – | – | – | – | Tungsten carbide (hard metal) |
| Sintering of carbide special parts (bushings, dies, rings, draw dies, mechanical seal rings,Casting | – | – | – | – | Tungsten carbide (hard metal) |
| Surface polishing of carbide moulded partsSurface | – | – | – | – | Tungsten carbide (hard metal) |
| Production of tungsten carbide (powder metallurgy, in-house sintering of carbide grades)Casting | – | – | – | – | Tungsten carbide (hard metal), Cermet |
| Inspection of dimensional accuracy and concentricityTesting | – | – | – | – | Tungsten carbide (hard metal) |
1 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Production area machine fleet (grinding/machining machines for tungsten carbide, expansion 2018) | – | – | Ø 0.1 to Ø 100 mm (round grinding); Ø 0.5-40 mm (cut-to-length); Ø 6-32 mm (flats DIN 6535); Ø | – | Dornstadt |
Additional services
Quality Assurance
HHT guarantees the highest quality standards through a seamless concept for ensuring consistent carbide quality. All products are traceable back to production; dimensional accuracy and concentricity are checked with highly precise measuring equipment.
| Evidence | Dornstadt |
|---|---|
| ISO 9001 |
History
- 1973
Foundation of HHT by Mr Mihm in Schwaig near Nuremberg
- 1980
Relocation to Weilheim an der Teck under the management of Mr Laitzsch (carbide operations on 55 sqm)
- 1983
Mr Laitzsch takes over the company HHT after Mr Mihm's departure
- 1986
Relocation to Neidlingen (carbide operations on 100 sqm)
- 1990
Relocation to Weilheim an der Teck and takeover by Mr Widmann (120 sqm)
- 1997
First certification to DIN ISO 9001
- 2001
Relocation to Merklingen (150 sqm)
- 2003
30 years of HHT
- 2008
Relocation to Dornstadt (650 sqm)
- 2011
HHT becomes a GmbH & Co. KG; Mr Mangold and Mr Widmann lead the company
- 2013
Mr Mangold takes over HHT-Hartmetall GmbH & Co. KG
- 2018
Expansion of the machine fleet to broaden the range of services
- 2021
Expansion of production and warehouse space to more than 1000 sqm
- 2023
More than 50 years of HHT