Manufacturer of special tools for tube fastening and tube working in apparatus and boiler construction.
A.O. Rohrwerkzeug GmbH
Münnerstadt (DE)New on Amplifa
About A.O. Rohrwerkzeug
A.O. Rohrwerkzeug GmbH is a manufacturer of special tools for apparatus and boiler construction based in Münnerstadt in Lower Franconia. The portfolio includes rolling-in technology (tube expanders for fastening tubes in shell-and-tube heat exchangers and boiler systems), drive technology with electronic rolling-in systems, disassembly tools such as tube pullers and tube end cutters, as well as centering tools and tools for weld seam preparation. In addition to series production, the company develops and manufactures special tools and tool adapters according to customer requirements, complemented by service and demonstrations at the customer's site. Founded in 1951 as Albert Otto KG, the company still bears the founder's initials; since its acquisition by Dipl.-Ing. Harald Frank in the late 1990s, manufacturing, sales and service of the complete range of tube working and tube fastening have been offered from a single source. Since April 2017, Ralf Straub has led the company together with Martin Frank.
- Site
- Münnerstadt
- Processes
- Rolling-in (tube fastening with tube expanders, rolling-in technology), Taper tube expanders H 04/05/06 (tapered seating of the tube end, rolling range 9.6–59.0 mm), Quick-step tube expanders BR 10–15 (self-acting, roll length 40/60 mm), Taper tube expander without stop (rolling range 9.0–55.0 mm), MH tube expanders for the mechanical-hydraulic rolling-in process (tube outer Ø 8.8–22.5 mm,, Ventilsitzwalzen BR 32 (rolling-in of seat rings on turret lathe/engine lathe, nominal size 15–200, Self-acting tube expanders BV/BVL (rolling sizes 7.2–84.0 mm, working depth up to 150 mm), Cap rolling-in with SIMPLEX rolling-in tool to DIN 443 (NW 32–96)
- Materials
- Cast parts (engine housings, cylinder heads), Rolling-in (tube fastening), Mechanical-hydraulic rolling-in process, Hydraulic tube expansion, Machining (tube working), Cast parts
- Founded
- 1951
- Industries
- Apparatus engineering, Boiler construction, Shell-and-tube heat exchangers
- 01
Design/Special tool engineering
- 02
Manufacturing of tube expanders and systems
- 03
Sales
- 04
Service and demonstrations at the customer's site
Materials & Processes
Rolling-in (tube fastening)
Tube expanders of various designs fasten tubes in shell-and-tube heat exchangers and boiler systems.
Mechanical-hydraulic rolling-in process
MH series tube expanders for tube outer diameters of 8.8–22.5 mm and working depths of 50–150 mm.
Hydraulic tube expansion
Hydraulic tube expansion system TES for expanding tubes.
Machining (tube working)
Tube end cutters, tube annular cutters and tube end milling machines for machining and preparing tubes.
Cast parts
SIMPLEX cap rolling-in tool to DIN 443 for core plugs in engine housings and cylinder heads.
Locations
Münnerstadt
DEHeadquarters: manufacturing, sales, service
- Materials
- Steel tools, cast part processing
- Electronic rolling-in system STG.D. 400/TC 4 with drive machine D532 (4 speeds 120/185/380/580 rpm, 1200 W)
- Flexible shaft TS 72, size 2 – MK 3
- Tube pullers TP (up to/below OD 30 mm) and TPS
- Hydraulic tube expansion system TES
- Small rolling-in system STGL
Components & Products
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Rolling-in (tube fastening with tube expanders, rolling-in technology)Forming | – | – | – | – | – |
| Taper tube expanders H 04/05/06 (tapered seating of the tube end, rolling range 9.6–59.0 mm)Forming | – | – | – | – | – |
| Quick-step tube expanders BR 10–15 (self-acting, roll length 40/60 mm)Forming | – | – | – | – | – |
| Taper tube expander without stop (rolling range 9.0–55.0 mm)Forming | – | – | – | – | – |
| MH tube expanders for the mechanical-hydraulic rolling-in process (tube outer Ø 8.8–22.5 mm,Forming | – | – | – | – | – |
| Ventilsitzwalzen BR 32 (rolling-in of seat rings on turret lathe/engine lathe, nominal size 15–200Forming | – | – | – | – | – |
| Self-acting tube expanders BV/BVL (rolling sizes 7.2–84.0 mm, working depth up to 150 mm)Forming | – | – | – | – | – |
| Cap rolling-in with SIMPLEX rolling-in tool to DIN 443 (NW 32–96)Forming | – | – | – | – | Cast parts (engine housings, cylinder heads) |
| Tube end squaring (tube end cutters TF, with countersinks or indexable inserts)Machining | – | – | – | – | – |
| Tube annular cuttersMachining | – | – | – | – | – |
| Tube pulling (tube pullers TP up to OD 30 mm, TP from OD 30 mm, TPS)Forming | – | – | – | – | – |
| Tube end milling (tube end milling machine, weld seam preparation)Machining | – | – | – | – | – |
| Centering of tubes (centering tools BR 54, centering cartridges)Machining | – | – | – | – | – |
| Hydraulic tube expansion (hydraulic tube expansion system TES)Forming | – | – | – | – | – |
| Special tool engineering according to customer requirements (e.g. tool adapters, special versions)Engineering | – | – | – | – | – |
8 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Electronic rolling-in system / rolling-in controller | A.O. Rohrwerkzeug STG.D. 400/TC 4 | – | 400 V, 3 phases, 50/80 Hz; 4 speeds 120/185/380/580 rpm; power input 1200 W; Morse taper shank MT | – | Münnerstadt |
| Drive machine | D532 | – | 400 V, 3 phases 50/80 Hz, 1200 W | – | Münnerstadt |
| Flexible shaft | TS 72, size 2 – MT 3 | – | with ball guide, union nut, protective tube | – | Münnerstadt |
| Tube puller | A.O. Rohrwerkzeug TP up to OD 30 mm | – | – | – | Münnerstadt |
| Tube puller | A.O. Rohrwerkzeug TP from OD 30 mm | – | – | – | Münnerstadt |
| Tube puller | A.O. Rohrwerkzeug TPS | – | – | – | Münnerstadt |
| Hydraulic tube expansion system | A.O. Rohrwerkzeug TES | – | – | – | Münnerstadt |
| Rolling-in system (small version) | A.O. Rohrwerkzeug STGL | – | – | – | Münnerstadt |
Additional services
History
- 1951
Founded as Albert Otto KG by company founder Albert Otto from Berlin.
- 1970er
In the late 70s, merger with the Remscheid-based company Kotthaus + Busch.
- 1991
Independent again under the name A.O. Rohrwerkzeug GmbH.
- 1990er
In the late 90s, acquisition by Dipl.-Ing. Harald Frank (Frank Rohr- und Walztechnik, Lauta); foundation stone for complete tube working and tube fastening.
- 2017
In April, Harald Frank steps back; all activities of Frank Rohr- und Walztechnik transferred to A.O.; management by Ralf Straub and Martin Frank.