Tag Archives: work piece

Science Research Technology

Walther Trowal: New Rotamat coater for small batches

Coating of mass-produced small parts: Effective coating of part batches from 2 to 15 l (0.5 to 4 gallons)

Walther Trowal: New Rotamat coater for small batches

The new Rotamat R 60 from Walther Trowal was developed for batches of up to 15 l (4 gallons)

At the PaintExpo 2018 Walther Trowal introduces the new Rotamat R 60 for coating mass-produced small parts. It allows the effective processing of small batches of, among others, metal parts with relatively high bulk weights. Even though specifically designed for small batches, the R 60 coater offers all the functional features of its larger „siblings“.

With the new Rotamat R 60 Walther Trowal is rounding off its equipment range for coating mass produced bulk parts down to very small batches. For the very first time it is now possible to effectively coat small part volumes of up to 15 liters (4 gallons).

With a drum diameter of only 600 mm (24″) this coater is ideally suited for processing small part batches like, for example, in the aerospace industry, where batch sizes rarely exceed 50 l (13 gallons). Of course, this also includes metallic work pieces with high bulk weights, which might get damaged in larger drums through the intensive part-on-part contact. These include spikes for snow tires, bullets and balancing weights.

Frank Siegel, the sales manager for „coating technologies“ at Walther Trowal can now offer the right machine for practically any coating application: „We have many customers who must coat small part batches but do not want to give up the high quality standard we achieve with our Rotamat models R 80 and R 90. With the new R 60 coater you can now effectively process small part batches without having to invest in a larger machine“.

The Walther Trowal R 60 Rotamat coater, introduced at the PaintExpo 2018 includes all the proven design features of the larger machines like the supply and exhaust air handling system, the explosion-proof LED lighting of the drum interior and the drum drive shaft mounting.

Technical details
Precise control of the supply air temperature

The temperature of the supply air is measured directly at the entry point into the drum. This is considerably more precise than the previous measuring point, where the sensor was placed at the exit of the heating unit. The result: A much more accurate control of the air temperature in the drum.

Eco-friendly operation

Like the larger models, the Rotamat R 60 incorporates a 4-stage exhaust air filtering system with a paper labyrinth filter, a filter mat and two bag filters.
Low energy consumption

Walther Trowal sized the heating unit to reflect the smaller drum diameter. This resulted in a considerably lower heat input. Depending on the physical properties of the work pieces the R 60 Rotamat can be equipped with a PID or step control of the heating unit. The result: The customers can now use coating materials, which cannot exceed or fall below certain temperatures.

Suitable for high solvent concentrations

The supply air volume in the new R 60 coater is measured with a Pitot tube. This allows the precise calculation of the solvent concentration and facilitates the certification of the machine for a high solvent throughput. This is very important for special applications like, for example, the coating of parts with an adhesion primer.

Walther Trowal at the PaintExpo 2018
17. to 20. April 2018 | Karlsruhe/Germany
Hall 2, Stand 2310

For 85 years Walther Trowal has been a pioneer and market leader in various surface treatment technologies. The company offers modular and custom engineered solutions for a wide range of surface treatment problems.

Initially only making vibratory finishing equipment, over the years Walther Trowal has continuously broadened its product range and today offers a wide portfolio of equipment and services for improving all kinds of surfaces, e.g. mass finishing, part cleaning, shot blasting and drying of a wide spectrum of work pieces, last but not least, the coating of mass produced small parts.

Walther Trowal offers not only various types of equipment but complete surface treatment systems: By linking the various equipment modules and automating the complete process, we are able to precisely adapt our process technologies to the technical requirements of our customers. This also includes various types of peripheral equipment and process water cleaning and recycling systems. Of course, we also offer comprehensive pre- and after-sale service like sample processing in one of our demonstration labs and global repair and maintenance service.

Walther Trowal serves many customers in many industries around the world. For example, in the automotive and aerospace industry, medical engineering and wind power generation.

Company-Contact
Walther Trowal GmbH & Co.KG
Frank Siegel
Rheinische Str. 35-37
42781 Haan/Germany
Phone: +49 2129.571-0
Fax: +49 2129.571-225
E-Mail: info@walther-trowal.de
Url: http://www.walther-trowal.de

Press
VIP Kommunikation
Regina Reinhardt
Dennewartstraße 25-27
52068 Aachen/Germany
Phone: +49.241.89468-24
Fax: +49.241.89468-44
E-Mail: reinhardt@vip-kommunikation.de
Url: http://www.vip-kommunikation.de

Politics Law Society

Walther Trowal cuts processing times for finishing of blisks from several days to a few hours

Surface finishing of components for the aerospace industry

Walther Trowal cuts processing times for finishing of blisks from several days to a few hours

The work bowl of the “CM” rotary vibrator.

For the efficient surface finishing of high value work pieces like blisks for airplane and land based turbines, Walther Trowal has redesigned its CM vibratory system. It ensures that the work pieces receive a uniform, homogeneous high quality finish with absolutely repeatable results.

The surface finish of blisks („Blade Integrated Disks“) in airplane and other turbines affects to a large extent the airflow characteristics and, thus, the overall efficiency, fuel consumption and noise emissions.

To date the surface finishing of blisks was done manually with grinding disks and other manually operated tools. Due to the „human factor“ the quality of the final finish could greatly vary between work pieces. Frequently, it could even happen that certain surface areas were not finished at all.

For the consistent and high quality finishing of circular high value components Walther Trowal redesigned the rotary vibrator „CM“ in close cooperation with leading turbine manufacturers to make it more suitable for treating all kinds of turbine components.

The „CM“ system allows deburring and general surface improvement of components with diameters of up to 980 mm.

Single work pieces are mounted to the inner dome of the processing bowl. The height of the inner dome itself has been drastically shortened. After grinding media has been filled into the bowl, a vibratory motor causes the complete work bowl to vibrate. This causes a constant „rubbing“ of the media against the fixed work piece. Since the „rubbing“ action is highly homogeneous, a uniform, even finish on all surface areas of the disk and blades is achieved. After completion of the process the surface roughness readings amount to Ra = 0.2 to 0.4 µm.

Starting with an initial surface roughness of Ra = 4 to 5 µm, the desired finishing results are achieved within about five to six hours. Compared to this innovative method the manual finishing of blisks can take several days.

Christoph Cruse, sales manager at Walther Trowal, is commenting on the special conditions prevailing in the aerospace industry: „Especially for the production of turbine components any manual manufacturing operations must be viewed with great skepticism, because the quality of the work will vary greatly. With our new finishing machine we have completely eliminated the vagaries of the human factor. And, we can reduce the finishing times for blisks from several days to just a few hours“.

For finishing of blisks Walther Trowal is recommending the special finishing media, type V 2030. This media produces very smooth surface finishes on materials and shapes, which are typical for blisks. Of course, the V 2030 media is globally approved for the aerospace industry.

Walther Trowal at Singapore Airshow, February 6 – 11 2018
Booth L82

For 85 years Walther Trowal has been a pioneer and market leader in various surface treatment technologies. The company offers modular and custom engineered solutions for a wide range of surface treatment problems.

Initially only making vibratory finishing equipment, over the years Walther Trowal has continuously broadened its product range and today offers a wide portfolio of equipment and services for improving all kinds of surfaces, e.g. mass finishing, part cleaning, shot blasting and drying of a wide spectrum of work pieces, last but not least, the coating of mass produced small parts.

Walther Trowal offers not only various types of equipment but complete surface treatment systems: By linking the various equipment modules and automating the complete process, we are able to precisely adapt our process technologies to the technical requirements of our customers. This also includes various types of peripheral equipment and process water cleaning and recycling systems. Of course, we also offer comprehensive pre- and after-sale service like sample processing in one of our demonstration labs and global repair and maintenance service.

Walther Trowal serves many customers in many industries around the world. For example, in the automotive and aerospace industry, medical engineering and wind power generation.

Company-Contact
Walther Trowal GmbH & Co.KG
Martin Huebner
Rheinische Str. 35-37
42781 Haan/Germany
Phone: +49 2129.571-209
Fax: +49 2129.571-225
E-Mail: m.huebner@walther-trowal.de
Url: http://www.walther-trowal.de

Press
VIP Kommunikation
Regina Reinhardt
Dennewartstraße 25-27
52068 Aachen/Germany
Phone: +49.241.89468-24
Fax: +49.241.89468-44
E-Mail: reinhardt@vip-kommunikation.de
Url: http://www.vip-kommunikation.de

Science Research Technology

Walther Trowal: An amusement park ride served as idea for gentle finishing of high cost work pieces

New drag finishing machine works with overlapping rotational movements.

Walther Trowal: An amusement park ride served as idea for gentle finishing of high cost work pieces

The “Octopus” ride we all know from amusement parks provided the idea for the new machines.

Trowal developed the new drag finisher line M-TMD for processing work pieces requiring perfect surface finishes. The work pieces, mounted to rotating satellite stations, undergo multiple overlapping, pre-programmed, rotational movements. This rotational variation produces optimum finishing results.

Walther Trowal developed the new drag finisher specifically for finishing high value components, which must be handled with extreme care.

Typical work piece examples from the medical engineering industry are hip and knee implants requiring a high gloss polish. In the aerospace industry turbine blades and other components must receive a first-class finish with precise edge radiusing and very smooth surfaces. Examples from the automotive industry include the vanes of turbo chargers, which must not be nicked or damaged during the finishing process.

Christoph Cruse, General Sales Manager at Walther Trowal, foresees a big demand at those customers, who produce high precision, high value components: „With our new equipment line we address precision component manufacturers, who want perfect surface finishes, and where any blemishes like scratches could require scrapping a part. We also target manufacturers demanding tolerances of just a few microns. For these work pieces the M-TMD drag finishers with their optimum flow characteristics open entirely new possibilities.“

The functional principle: A rotation within the rotation

In standard drag finishers the work pieces are mounted to rotating work stations and „dragged“ through the grinding or polishing media. This movement creates a high processing intensity and produces excellent results on many parts.

In the new machines the work stations consist of multi spindle heads with each spindle holding one work piece. In addition to the carousel and work station rotation each spindle has its own rotational movement. In other words: The spindles move in a circle within two larger circles formed by the carousel and work station rotation. This is similar to the movement of the cabins in „Octopus“ rides that can be found at any amusement park.

The drag finisher M-TMD 4 is equipped with 4 multi spindle heads (work stations) with each head containing 3 spindles. In the M-TMD 6 up to 18 work pieces can be processed at the same time.

The independently adjustable rotational speed and rotational direction of the spindle heads and spindles creates a wide range of different movement patterns. In addition, the spindle heads can be tilted in different angles. This allows adjusting the flow characteristics to the specific shape of the various work pieces. With the PLC controller multi stage processing programs can be easily implemented.

During the finishing process the work bowl is vibrating for the optimum mixing of the grinding or polishing media. This guarantees a high degree of process consistency.
The media fines and undersize media, along with the metal fines from the work pieces, are continuously discharged from the machine; another contribution towards process stability and consistency.

Form surface grinding to high gloss polishing

The new Trowal machines can be operated in wet as well as dry processing mode. For surface grinding and smoothing, as well as for certain polishing operations, compound and water are used. In the case of targeted edge radiusing with tolerances of a few micron, for example, hard metal drill bits and milling heads, a dry process with special grinding granulate is utilized. Dry processing with organic polishing media and paste is also suitable for high gloss polishing.

Multiple finishing steps, from pre-grinding all the way to the final polishing stage, can take place in one single machine without the need to remove and remount the work pieces to the work stations: One work bowl filled with a certain finishing media can be easily and quickly removed with a pallet truck and replaced with a bowl containing another media.

Processing trials guarantee proven results

The first unit of the new machine generation has been installed in the Walther Trowal test lab in Haan/Germany. It is available for processing trials with customer work pieces allowing the customers to prove their finishing process, before making an investment decision. This ensures that the customer specifications can be fully met. Once the trials have yielded a viable process, the work piece range and quantity is analyzed to determine machine type & size, media & compound type, process water treatment system and drying method.

Background:
Drag Finishing
The drag finishing technology, developed by Walther Trowal about 30 years ago, has been continuously refined and, today, is an established finishing method that is ten to twenty times more efficient than conventional mass finishing systems.
The work pieces are individually mounted to rotating work stations integrated into a rotating carousel. During the process the parts never touch each other. Once the parts are mounted, the carousel with the work stations is lowered into a work bowl filled with grinding or polishing media. The work stations with the mounted work pieces are then „dragged“ through the stationary media mass. This translates into a highly efficient use of the kinetic energy between work pieces and media.
The new machines of the M-TMD series enlarge this effect by the addition of a third rotational movement of the spindles.

Facts about Walther Trowal

Since 1931 Walther Trowal develops, manufactures and markets modular and custom engineered solutions in the field of surface finishing.

Initially only making vibratory finishing equipment, over the years Trowal has continuously broadened its product range and today offers a wide portfolio of equipment and services for improving all kinds of surfaces, e.g. mass finishing, part cleaning, shot blasting and drying of a wide spectrum of parts, last but not least, the coating of mass produced small parts.

Walther Trowal offers not only various types of equipment but complete surface treatment systems: By linking the various equipment modules and automating the complete process, we are able to precisely adapt our process technologies to the technical requirements of our customers. This also includes various types of peripheral equipment and process water cleaning and recycling systems. Of course, we also offer comprehensive pre- and after-sale service like sample processing in one of our demonstration labs and global repair and maintenance service.

Walther Trowal serves many customers in many industries around the world. For example, in the automotive and aerospace industry, medical engineering and wind power generation.

Firmenkontakt
Walther Trowal GmbH & Co.KG
Georg Harnau
Rheinische Str. 35-37
42781 Haan/Germany
+49 2129.571-209
+49 2129.571-225
g.harnau@walther-trowal.de
http://www.walther-trowal.de

Pressekontakt
VIP Kommunikation
Regina Reinhardt
Dennewartstraße 25-27
52068 Aachen/Germany
+49.241.89468-24
+49.241.89468-44
reinhardt@vip-kommunikation.de
http://www.vip-kommunikation.de