Characterized by its sturdy design and numerous technical features, Rosler Metal Finishing’s drag finishing systems are ideal for high value and sensitive parts such as aerospace components that cannot touch each other during the finishing process.
Equipped with a rotary carousel featuring 2 to 12 spindles to mount the parts, work pieces are “dragged” through the media mass. The rotation of both the carousel and the spindles guarantee an even treatment of the parts. Drag finishing offers a metal removal rate that is up to 40 times higher than conventional vibratory finishing.
At Rosler, we believe in helping our clients in unique markets find a better way to finish and process their products. According to Grand View Research, Inc., the global structural steel market is expected to reach USD 140.4 billion by 2025. It is projected to expand at a CAGR of 5.6% during the forecast period. Increasing construction spending in emerging economies is projected to drive the demand for structural steel. Maybe that’s why our top posts this year included a series on Structural Steel. Enjoy the following recap.
5. Optimal Media Mix, Part 1 – Identifying and Maintaining Proper Levels
The best mass finishing equipment is useless without the proper media. That’s why the experienced engineers at Rosler Metal Finishing pair their quality equipment with the right type and amount of media to achieve consistent results.
Understanding how your machine, the work pieces it
is finishing, and the selected media will interact is key to delivering an
optimal finish each cycle. Doing so requires understanding why media levels are
important, determining and tracking levels, and evaluating media consumption to
Like mass finishing, shot blasting is an exceptionally versatile surface treatment technology. Its applications range from general cleaning after casting and forging to shot peening and, even, cosmetic blasting for placing a fine, matte finish on the work pieces.
For shot blasting of orthopedic implants Rosler Metal Finishing recommends mainly air and occasionally wet blasting systems. The blast media is accelerated by compressed air and thrown at the work pieces through a blast nozzle, creating an extremely precise blast pattern compared to turbine blasting. Another advantage of air blasting is that it can be used with metallic, mineral as well as organic blast media.
These attributes and many more make this surface finishing method particularly useful in the medical industry.
To this day, the surface of large structural
aircraft components is frequently finished by hand. This process is not only
costly, but extremely inefficient and hard to replicate with absolute
Rosler Metal Finishing is changing the notion that suitable mechanical finishing equipment is not available for large, structural aerospace components by offering mass finishing technology capable of solving this problem and providing fully automatic finishing of work pieces up to 30 feet long.
We kick off our Aerospace Series with an overview
of the cost-effective and mechanical finishing options Rosler offers for the
Vibratory Tubs Offer a
Thanks to the development of large, powerful vibratory tubs manual deburring and grinding of large aircraft components can now be eliminated. The development of perfectly controlled mechanical finishing systems offers finishing solutions for applications where the biggest rotary vibrator, because of the size of the parts, might still be too small.
Mass finishing is a highly versatile finishing technology that can be used for a wide variety of different surface treatment operations including those in the medical industry. Therefore, it is no surprise that mass finishing processes are utilized at practically every manufacturing stage for all kinds of orthopedic implants.
Rosler Metal Finishing has decades of experience in mass finishing. In this installment of the Joint Reconstruction Series, we will compare the various machines used to provide precise finishing for endoprosthetic manufacturers.
Examples ofMass Finishing
Mass finishing is used for a variety of joint
replacement work pieces including:
Descaling and edge radiusing of hip stems, knee femorals, and other
implants after forging or casting, e.g. lost wax or investment casting.
Deburring and surface smoothing of various implants after belt or CNC
Final polishing of knee femorals, femoral heads, and the inside of
acetabular cups to Ra = 0.8 micro inches as the last finishing stage before
While none of these work pieces contain sand, their
surfaces may show oxidization or – in the case of ferrous metals – heavy
scale/rust caused by iron oxide.
All forms of oxidization must be removed to ensure
that subsequent manufacturing operations such as machining, coating, and
painting are economical and efficient. Poorly cleaned work pieces may cause additional
processing, premature wear on milling tools and drill bits, excessive pollution
within coolant systems, and inefficient adhesion of coatings and paint.
Traces of oxidation may also impact the work
Shot blasting and mass finishing have become indispensable technologies for surface preparation and finishing of joint reconstruction implants. Their applications range from surface cleaning, deburring, edge radiusing after forging, casting, additive manufacturing, and machining to surface preparation for different kinds of coatings, shot peening for increasing the longevity of an implant, and placing an extremely smooth, high-gloss finish on the implants before they are inserted into the body.
Are the work pieces sturdy enough to allow for somewhat more aggressive processing or must they be handled gently without any part-on-part contact?
Is batch processing possible or must it be continuous?
Which work piece handling system is best: rotary drum, troughed belt, wire mesh belt, or overhead monorail system?
Can the work pieces be handled by robot, etc.?
Rosler Metal Finishing builds shot blasting machines that are designed to expertly prepare the surface of delicate and sturdy die castings and everything in between. We can design a machine that is perfectly matched to your work piece and process.
While choosing the right implant material is of utmost importance, as discussed in our previous Joint Reconstruction Series post, the significance of optimum surface treatment throughout the entire implant manufacturing process cannot be overstated.
This relates not only to the right surface finish
– be it a high-gloss polish for low friction, a textured surface for easy
osseointegration, or as preparation for subsequent coating, rounded edges, etc.
– but also total compliance with the specified tight dimensional tolerances. The
success of a joint implant is determined by the perfect match between the
various implant components. This depends, to a large extent, on the surface
Our Forge and Foundry Series continues with a look at the cleaning required for sand castings and the collection of removed contaminants.
Rosler Metal Finishing builds shot blasting machines that are equipped to prepare the surface of sand castings as well as collect removed contaminants for a consistent workpiece finish and the health of the utilized machine and personnel.
What design features must be considered in blast turbines used for the cleaning of sand castings?
Baked-on molding sand, sand cores, and scale/rust on the sand castings are difficult to remove and require turbines with a lot of fire power. Turbines with curved throwing blades, such as Rosler’s Gamma G series, have proven to be exceptionally effective since, compared to straight-bladed turbines, the curvature of the blades generates up to 25 percent higher throwing speeds!