OTRA successfully supplied Walther Trowal surface finishing machine to a leading aerospace company in Korea.
Founded in 1931 Walther Trowal has customers in areas like surface annealing, mass finishing, small parts coating, blasting, process water, automation and networking, work piece cleaning and drying.
Walther Trowal provides products, services, testing and individual planning for customer processes. Alongside range of machinery with peripheral devices, Walther Trowal also produce specialized abrasive and polishing media, compounds, flocculants and spare parts. With over 230 staff around the world, Walther Trowal is one of the leading providers of surface processing technology.
Please email email@example.com call +82 31 275 2491 for more information.
Founded in 1920, Haefeli manufactured sintered diamond and CBN grinding tools in Zurich since 1949.
Haefeli tools is well known for their focus on precision. In particular the original Haefeli grinding pencils, with sintered versions as small as 0.18 mm in diameter is unmatched in the industry.
Haefeli’s product range
Diamond and CBN grinding wheels
Product range available from ∅ 6 mm up to ∅ 400 mm.
CBN and diamond grinding pins
Product range start from as small as ∅ 0,18 mm
Polishing pastes in syringes with 5 gr. (20gr. availabe on demand) and hand files for treating the edge of cutting tools (burrs and radiuses).
Restore the bite of your resin-ceramic and metal bonded cBN and diamond grinding tools with the HACO-FLEX grinding layer regenerator. The flexible HACO-FLEX is pressed either by hand or by machine without a coolant into the bonding material, ideally with a reduced cutting rate. It penetrates deeply and, like an erasing rubber, it cleans out the gaps until the abrasive grains protrude by about 1/3 from the bonding material.
Some grinding problems seem unsolvable at first glance in particular when developing new products or rearranging the production. We have quickly and flexibly created custom-made grinding tools for such tasks in small as well as large quantities. Simply ask us if you need a custom grinding wheel.
The Magnetfinish(MF) technology is a new mechanical process for technical surfaces. The magnetic powder works during the process as an elastic tool. Surfaces will be smoothed till a roughness of Ra = 0,02 micrometers.
– Workpiece is positioned in a magnetic field created by magnetic disc
– The gap between workpiece and disc is filled with an processing powder
– The processing powder is both abrasiv and magnetizable
– Bonding the processing powder in magnetic field allows high speed movement
– The direction the powder hits the surface is controlled by programs
: Highest productiv treatment of surfaces, universally usable.
Honing of cutting edges on steel, carbide, CBN, PCD, etc.
Polishing the flute of cutting tools (drills, deephole drills, endmills, taps, etc.)
Polishing after coating, removing of droplets.
Deburring on steel, tap, HSS drills, medical tools, components, etc.
Combined applications for tools and components, e.g. honing of cutting edges and polishing of flutes, e.g. deburring of edges and polishing sealfaces.
Extending lifetime, improved adhasion of following coating layer.
Better chipflow, increased productivity of tools, decreasing of roughness till Ra 0.02 micron.
Reducing friction, increased productivity of tools.
Avoiding of the running phase, extending lifetime, better work results.
All results in only one run, highest productivity.
When producing ASME BPE, Semiconductor or Japanese standard fittings the elbows must be polished to remove all marks and imperfections. When bending the tube there are always ‘orange peel’ marks and marks from calibrating the elbow (making it round).
Today, it is polished manually or polishing using mechanical polishing machine. For manual polishing, it is usual to have a team of 40+ people manually polishing with abrasive paper.
Mechanical polishing is slower, produces a dust/metal particles during operations, and leaves residual oil. Mechanical polishing also produces less than satisfactory quality.
ECM Methodology developed by pECM Systems and introduced by OTRA in Korea produces far superior and consistent surface finish while reducing cost per parts significantly.
pECM Systems provides turn-key systems for the manufacture of a variety of ASME BPE stainless steel pipe fittings. The systems include machine tool, control system, electrolyte management and tooling. In addition to the tooling all process parameters are supplied so that the system can enter production immediately after installation.
Applications ‘BioPharma’ and “ultra-high purity (semiconductor)” elbows and Tee’s are produced with our technology to ensure ultimate quality and performance (below)
- Very fast Return on Investment (ROI)
- No abrasive polishing material >$200k saved PER YEAR. (Based on 100,000 elbows)
- High Production rates (One operator being able to produce > 10000 elbows per month!)
>150 per hour 1” elbows
> 60 per hour 1 1⁄2” elbows
- Zero Cathode wear – 1000’s of components can be produced
- Simple to use
Systems for manufacturing BPE components by ECM
The machine is set up in two stations. One station is for loading/unloading and another for ECM process. ECM process is carried out on each station alternatively.
The machine tool is of composite granite and stainless steel construction to ensure precision, stability and long life.
- Designed to Machine to final dims and tolerances
- Special attention to surface finish
- Simple operation
- Very few consumables