Tag Archives: blast turbines

Science Research Technology

The new generation of Trowal continuous shot blast machines is in operation

A Mexican manufacturer of automotive aluminum die-cast components now operates five continuous shot blast systems from Walther Trowal.

The new generation of Trowal continuous shot blast machines is in operation

The new THM troughed belt continuous shot blast machine equipped with turbines with curved throwing.

Walther Trowal has recently commissioned a THM troughed belt continuous shot blast machine for a customer in Mexico that is equipped with a brand new generation of blast turbines. These turbines were specifically designed for shot blasting of aluminum components. With a considerably higher blast media throwing speed the new turbines produce significantly shorter cycle times than the predecessor models.

The Mexican customer already operates very successfully four continuous Trowal shot blast machines. Because of their excellent performance he chose to purchase another THM machine, when he had to expand his production capacity.

Up-and-coming: Aluminum, the gentle blast media

The increasing sales trend at Walther Trowal indicates that ever more customers are switching to aluminum media when shot blasting aluminum components. Because of its lower bulk density aluminum media is a lot gentler than, for example, stainless steel shot. Typical automotive forgings made from aluminum are, for example, steering knuckles or swivel bearings. Aluminum die-castings processed in THM shot blast machines can be all kinds of housings, covers or levers.

Because of its lower density the impact energy of aluminum media on the work pieces is considerably lower compared to other blast media. To offset this limitation Walther Trowal developed turbines with curved throwing blades, which generate a significantly higher blast media throwing speed than straight blades. This, combined with the fact that in THM machines the turbines are located very close to the work pieces, and the media throughput is considerably higher, results in optimized energy utilization and surprisingly short cycle times. However, the shot blast treatment remains very gentle. In short, despite the relatively low density of aluminum blast media, the shot blast process is highly effective and at the same time surprisingly gentle preventing any warping or distortions of delicate work pieces.

Another benefit of aluminum blast media is that it reduces the wear rate in the turbines and the machine to a fraction of the wear caused by steel shot, resulting in higher uptimes and lower operating costs.

Walther Trowal offers a range of different machine sizes equipped with up to four turbines. For example, for forged aluminum components the new THM 700/4/E with 4 turbines and a power of 15 kW for each turbine, produces an exceptionally high degree of productivity.

Specifically designed for handling aluminum media

To meet all the challenges posed by aluminum shot the Trowal engineers redesigned many machine assemblies, among them the media dosing system and the turbines. One detail of many: A rough surface of the throwing blades would quickly destroy the aluminum particles. Therefore, Walther Trowal is smoothing the blade surface with in-house vibratory finishing equipment. The result: A greatly reduced blast media consumption, lower dust emissions and significantly improved turbine uptimes.

Gentle work piece transport

THM troughed belt continuous shot blast machines are equally well suited for treating mass-produced bulk parts or large, delicate components. Especially with delicate, somewhat fragile work pieces the THM concept offers significant advantages: In these systems the work pieces are evenly distributed through the entire machine length. This results in a very gentle transport and prevents intensive part-on-part collisions. And the fact that the transport rods are covered with a relatively soft PU further cushions the already gentle tumbling action. This is particularly important for fragile components with thin walls, allowing them to be discharged from the machine without any nicking or other damage.

No problem with older THM systems!

When developing the new turbines Walther Trowal also took into consideration the many older machines still in operation: Any THM customer who wants to take advantage of the new turbines can easily install them in his existing machine(s). This allows the customers to increase the efficiency of their shot blast operation with minimal costs.
For THM systems still requiring steel or stainless steel blast media, Walther Trowal supplies the new turbines with the curved throwing blades made from tool steel also offering significantly higher turbine uptimes.

Facts about Walther Trowal

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.

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

Science Research Technology

Aluminum components require soft, less abrasive blast media

New blast turbines with curved throwing blades reduce cycle times.

Aluminum components require soft, less abrasive blast media

The troughed belt continuous feed shot blast machines, type THM, with curved throwing blades reduce

At the Aluminium 2016 trade show Walther Trowal introduces a new generation of blast turbines for the troughed belt continuous feed shot blast machines, type THM. These turbines increase the throwing speed and, thus, reduce cycle times for shot blasting of light metals like aluminum and magnesium. For weight reasons these two metals are increasingly replacing components, which to date were made from steel. However, shot blast applications for aluminum and magnesium frequently require soft, less abrasive blast media like, for example, aluminum shot.

When it comes to shot blasting die-castings or forged components made from aluminum and magnesium, but also zinc, many users are switching to somewhat softer aluminum blast media. Yet, because of their lower bulk density the impact energy of these media is significantly lower compared to other media like steel shot. For this reason, Walther Trowal recently developed turbines with curved throwing blades, which generate significantly higher throwing speeds.

In addition to higher throwing speeds, the new turbines also allow a much higher media throughput. Despite the lower media bulk weight of these „soft“ blast media the results are shorter cycle times an, at the same time, greatly improved surface finishes.

Since the throwing blades in the new turbines are curved on both sides, the turbines can be run in two directions.

For applications requiring steel and stainless steel blast media, Walther Trowal offers the curved throwing blades in wear resistant tool steel. This increases the overall blade uptimes significantly.

The first machine equipped with the new turbines will be delivered to a customer shortly. Of course, existing THM machines can be easily equipped with the curved blade turbines allowing the users to increase productivity and reduce their costs.

Walther Trowal at the Aluminium 2016 trade show
(Dusseldorf/Germany, November 29 – December 1, 2016):
Hall 12 / Booth G 50

Background:

Troughed belt continuous feed shot blast machines: Extremely gentle work piece transport

The THM continuous troughed belt machines can handle large quantities of bulk produced small parts as well as large, delicate single work pieces with complex shapes. Because of the much simpler and gentler work piece handling they frequently replace conventional batch tumblast machines.

THM continuous feed machines are especially advantageous for treating very delicate components: Contrary to batch tumblast systems, where the parts are intensively tumbling over each other with a high risk of nicking, in the Walther Trowal THM machines the work pieces are spread out throughout the length of the trough, ensuring a gentle, nick-free processing. The work pieces are gently rolling over the transport rods coated with polyurethane. This gentle part transport is especially important for complex, thin-walled components requiring an intensive blast cleaning process. The results are perfectly cleaned parts without any nicking or other damage.

Compared to spinner hanger machines the THM continuous shot blast systems also offer significant technical advantages. Because the work pieces are gently tumbling through the tunnel formed by the troughed belt, they are exposed to the blast stream from all sides, with the distance between work pieces and turbines remaining constant. This ensures all around, perfect shot blasting results.

Aluminum: The gentle blast media

The blast cleaning and de-flashing of die-cast or forged aluminum components requires soft blast media. Typical forged parts are steering knuckles or swivel bearings. Aluminum die-castings processed in THM systems can be housings, covers, caps and levers.

But there is also an increasing trend towards utilizing magnesium die-castings, especially in the automobile industry. Many structural components, for example dashboard mountings, are made from magnesium. This material has not only a low weight, but also offers high tensile strength.

For shot blasting of these materials in THM machines aluminum media is becoming quite popular. Since the distance between the blast turbines and the work pieces is very small, the shot blast process is highly effective, even though the blast media has a low bulk density.

Facts about Walther Trowal

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.

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
www.vip-kommunikation.de