Tag Archives: Wet Blasting

Wet Blasting Equipment & Media, Part 2 – Technical Components Combine for Systematic Success

Wet blasting technology lends itself to a variety of processes and industries. From applying cosmetic (anti-glare) finishes and surface smoothing to deburring, de-powdering, decontaminating, and cleaning after casting, welding, and additive manufacturing, wet blasting has many capabilities.

Rosler has decades of worldwide experience developing technology and machines customized to each customer’s unique challenges and demands. Each solution we deliver is innovatively designed around core wet blasting components and calibrated to your work piece with carefully selected media and tested process parameters.

Basics Components

Wet Blast Principle Diagram

Regardless of their uses, all Rosler wet blasting machines start with a core group of components. While customized options and accessories can be added, these systems typically include 10 key components.

  1. Blast chamber with slurry tank – A mix of media and water is stored in this holding tank found at the bottom of the blast chamber. The chamber is made of stainless steel.
  2. Compressed air – Approximately 70 PSI of compressed air accelerates the slurry.
  3. Blast gun(s) – One or more guns accelerate the slurry supplied by the slurry pump with compressed air.
  4. Blast media feed – This component supplies the media slurry to the blast nozzle.
  5. Slurry pump – This high-powered mechanism transports the slurry to the blast gun(s). Larger wet blast systems can be equipped with multiple pumps.
  6. Slurry agitator (stirrer nozzle) – In order to keep the media suspended in the water, the slurry pump diverts some of its flow to a stirrer nozzle placed in the tank to agitate the mix of water and abrasives.
  7. Overflow – Small media particles, dirt, and other contaminants tend to stay suspended and are skimmed off and sent to the filtration unit.
  8. Water filtration system – Media particles and debris skimmed off the water’s surface must be passed through a filtration system to separate still usable media and process water from waste. Common filtration methods include hydrocyclones, weir tanks, bag filters, paper band filters, and semi- and fully automatic centrifuges.
  9. Filtered water – Once processed by a water filtration system, water is returned to the slurry tank and reused.
  10. Exhaust vent – The water mist mixed with media fines and other small particulates is removed from blast cabinet by suction fan-equipped filters.

The Rosler Way

We have the experience and expertise to meet your wet blasting needs. Rosler partners with you to find a better way, the best machine, and the best finishing results. Contact us today to discuss your unique challenges.

Previous posts in the Wet Blasting Equipment & Media series include:

Upcoming posts will include:

  • Part 3 – “Maintain Slurry Concentrations for Finishing Consistency.”
  • Part 4 – “Internal Cleaning, Rebuilds Prolong Machine Lifetime.”
  • Part 5 – “Careful Media Selection, Additive Use Impact Results.”

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Wet Blasting Equipment & Media, Part 1 – Machines Range in Complexity, Uses

Because of its many technical advantages and versatility, wet blasting is the fastest-growing segment in the field of shot blasting.

As with dry blasting, the available scope of wet blasting machinery ranges from simple, low-cost blast cabinets to sophisticated, partially or fully automated systems. Customers can choose between a wide spectrum of standard wet blasting equipment, however, for certain applications, special custom-engineered systems may offer the most efficient and cost-effective solution.

The machine type is usually determined by the processing task, the size and shape of the work pieces, and the desired degree of automation. Frequently, multi-axis robots are used for work piece handling or guiding the blast gun movement.

Rosler has extensive experience in wet blasting technology and the development of customized solutions. We have even developed the Rosler PureFinish® system for cleaning stainless steel components for the chemical, food, and pharmaceutical industries through wet blasting. This system cleans the work piece surface while facilitating cleaning, sterilization, and prohibiting bacterial growth.

Learn more about common types of wet blasting systems and examples of machine use for a glimpse into the technical capabilities wet blasting offers.

Continue reading Wet Blasting Equipment & Media, Part 1 – Machines Range in Complexity, Uses

Wet Blasting Technology, Part 5 – PureFinish® Offers Food-Grade Excellence

Within the food, chemical, and pharmaceutical industries, hygiene is a top priority. For safety and quality assurance, the occurrence of contamination through bacteria, proteins, or other elements must be prevented. Process plants require a defined, homogeneous, and reproducible surface for all parts that come in contact with food, beverages, chemicals, and pharmaceutical products.

Rosler delivers full compliance cleaning for stainless steel surfaces with PureFinish®, a unique wet blasting process.

What is PureFinish®?

Rosler developed this proprietary blasting process to deep-clean stainless steel components. Media specifically designed by Rosler for this environmentally friendly process remains suspended in water and is propelled onto the work piece surface with velocity. 

Continue reading Wet Blasting Technology, Part 5 – PureFinish® Offers Food-Grade Excellence

wet blasting technology, part 4 – typical wet blasting applications

Wet blasting can do nearly any job that is done with dry shot blasting. The defining differences are that wet blasting does so more gently and without producing dust. In addition, wet blasting can handle a small amount of oil and grease unlike dry blasting.

At Rosler, we have more than 80 years’ experience in surface finishing. While wet blasting has gained popularity recently, we’ve used this technique to provide precise, repeatable results to a number of industries over the years.

Typical Applications

With proper testing and process parameters, wet blasting can achieve numerous surface finishing goals.

Cleaning

Fastener with heat discoloration before and after wet blasting.
A fastener with heat discoloration before versus after wet blasting.

Depending on the work piece’s starting condition and successive finishing steps, rust, scale, oxidation, road grime, grease, and oil may need to be removed. Wet blasting can accomplish a variety of cleaning applications including:

  • Dies and molds such as die castings and tire and glass molds.
  • Automotive rebuilds such as engines, transmissions, brakes, etc.
  • Investment castings such as boat propellers, pump impellers, housings, valve bodies, etc.
  • Aircraft engine rebuilds.
  • Various components before inspection or secondary processing.

Burr Removal

Hydraulic components before and after wet blasting.
Hydraulic components before and after wet blasting.

Work pieces with flashings and burrs must undergo deburring and deflashing. For example, firearm components require burr removal after drilling, milling, and turning. Drill bits and milling tools also require burr removal.

Descaling

Despite the newest heat treatment processes, discoloration, oxidation, scale, and hard residues are found on cast and forged products as a result of manufacturing and environmental influences. Modern production methods, control and testing processes, and an uninterrupted continual processing of the cast and forged parts requires clean, light work piece surfaces.

Surface Texturing

Creating a somewhat rougher surface finish is a key step in preparation for painting, coating, and bonding with glue. Ensuring that subsequently applied coatings have a rough enough surface to adhere to improves the quality and life span of a work piece.

Examples of wet blasting applications for surface texturing include:

  • Preparation of automotive parts for rubber coating such as brake and engine seals.
  • Surface preparation to place a corrosion protection coating for screws.
  • Surface preparation to place a primer on airplane components such as rotor blades, stringers, and wing spars.
  • Orthopedic implants in which osseointegration and bone growth around the implant are encouraged. Light profiling of tibia plates, knee femorals, hip stems, and spinal implants helps promote this bone growth.

Stripping of Paint and Coatings

Reconditioning engine components with wet blasting.

Wet blasting is ideal for stripping of paint and coatings from delicate work pieces. Processing of mineral-based construction materials such as concrete or sandstone, glass, textiles, and wood is possible with Rosler machines as well as the finishing of plastics and metals.

Cosmetic Finishing

Wet blasting removes machining lines from aluminum gun bodies as shown in these before and after examples.
Wet blasting removes machining lines from aluminum gun bodies as shown in these before and after examples.

Wet blasting serves as an excellent method of applying a uniform, matte finish on work pieces. This finish can take various forms, including:

  • Creating a pre-polish finish smoother than what can be achieved with dry blasting.
  • Applying a non-glare, matte finish such as the finish required for surgical instruments.
  • Masking machining lines on a variety of parts like tibia implants or aluminum gun bodies.

Shot Peening

Landing gear includes many wet blasted components.

Shot peening is a process specially developed to improve the properties of components which are exposed to changing strains. For safety reasons, shot peening is also now absolutely necessary in the aviation and space industries. Shot peening is also essential in all industries requiring long lives for components including the automotive sector.

Wet blasting applications for shot peening are mainly used in conjunction with Almen strip N for glass beads, ceramic beads, and stainless steel shot.

Additive Manufacturing Post Processing

Additive manufactured components before and after wet blasting.
Additively manufactured components before and after wet blasting.

Wet blasting is an essential technology for various post processing tasks, specifically additive manufacturing. Wet blasting cleans the 3D printed components by removing residual powder and significantly reduces their initial high surface roughness. It is capable of de-powdering and providing general surface cleaning and initial surface smoothing from Ra = 1,000 micro inches down to Ra = 40-60 micro inches (25 µm to 1–1.5 µm).

On metal AM parts the loosely sintered grains on corners are effectively removed. The wet process eliminates the worry about residual powder containment or sparking during the blasting process.

De-contamination of nuclear power plant components

Manual wet blast cabinets allows for same removal of contaminants.

Removal of small, radioactive fragments from the component surface in nuclear power plants can also be achieved through wet blasting. The process decontaminates the components to a point where they can be declassified as radioactive. Special consideration regarding the water treatment are required to meet the requirements for this application.

The Rosler Way

With a trusted partner such as Rosler, you don’t need to worry about the ins and outs of an application. Contact us to discuss your wet blasting needs and challenges and we will deliver a solution. We’ll even demonstrate results with FREE sample processing in one of our global test centers. That’s the Rosler Way.

The complete Wet Blasting Technology Series includes:

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Wet Blasting Technology, Part 3 – Technical Features, Slurry Control Achieve Precise Finishing

Numerous technical features combine to make wet blasting an effective method of surface finishing.

When expertly combined by an experienced finishing expert such as Rosler, this method can achieve precise and repeatable results on a variety of work pieces from a wide range of industries.

A general understanding of the essential technical elements of a wet blasting machine will help you select a machine for your specific needs as well as prolonging the efficiency and life of existing wet blasting equipment.

Continue reading Wet Blasting Technology, Part 3 – Technical Features, Slurry Control Achieve Precise Finishing

Wet Blasting Technology, Part 2 – Comparing Attributes, Advantages to Dry Blasting

Unlike dry blasting in which only solid abrasive media is used, wet blasting processes use a slurry in which the media is embedded in water. This greatly cushions the impact energy on the work pieces, providing gentler, yet effective results for delicate work pieces.

As the utilization of wet blasting increases, Rosler reminds manufacturers to review their traditional, dry shot blasting applications and consider if wet blasting could provide additional efficiencies, reduced costs, and better results.

Understanding the Differences

Visual comparison of wet, dry shot, and dry grit blastings' impact on surfaces

As in any surface finishing process, the starting condition of the work piece, its material composition, shape, and final finish largely dictate which finishing application is most appropriate. Understanding how the application changes the work piece is a key consideration.

Continue reading Wet Blasting Technology, Part 2 – Comparing Attributes, Advantages to Dry Blasting

Wet Blasting Technology, Part 1 – Wet Blasting Gently Delivers Dramatic Finishing Results

Thanks to its many technical advantages and “gentle” application, wet blasting is a versatile and fast-growing segment of the shot blasting field. Achieving precise, repeatable results with any wet blasting process requires understanding both its principles and real-world uses.

With decades of experience and the latest in engineering expertise, Rosler understands how to develop efficient wet blasting machines and consumables. Learn more about wet blasting technology as we begin our five-part Wet Blasting Technology Series.

How Does Wet Blasting Work?

Wet blasting is a water-based method of shot blasting utilizing abrasives that are particularly suited for the finishing of delicate, precision-produced parts.

Continue reading Wet Blasting Technology, Part 1 – Wet Blasting Gently Delivers Dramatic Finishing Results

PureFinish® Stainless Steel Treatment For Optimum Hygiene

PureFinish® is a post-processing technique.  This technique allows stainless steel to be finished to a smoother surface with a low and reproducible SRI value below 0.010.  In practice, this produces a surface with a very low degree of adhesion characteristics. The PureFinish® treatment has been extensively tested by TNO. TNO, a Dutch organisation is the leading institute for Applied Scientific Research.  The SRI value (Soil Retention Index) was investigated because this parameter most accurately describes the relationship between surface structure, contamination and cleanliness.

Within the food and pharmaceutical industries hygiene is a top priority, not only for safety but also to prevent contamination and to ensure the quality of the product in terms of taste, aroma and appearance.  The occurrence of contamination through bacteria, proteins or other elements must therefore be prevented.  Process plants require a defined, homogeneous and reproducible surface for all parts that come in contact with food, beverage and pharmaceutical products.

Continue reading PureFinish® Stainless Steel Treatment For Optimum Hygiene

The Optimisation Of Stainless Steel Surfaces

Over the decades researchers have searched for optimal and efficient techniques to adequately recondition the surface of stainless steel after it has been subjected to various processes. This article examines the various processes currently used and the surface conditions achieved. An independent study has shown that water jet blasting may offer the best solution in terms of both the degree of smoothness achieved and the avoidance of using chemical products.

Continue reading The Optimisation Of Stainless Steel Surfaces

Aerospace – Applications for dry and wet / vapour blasting

The Aerospace Industry is a major precision manufacturing industry that justifiably employ Blast processes Surface Preparation and Finishing.  The industry is identfied by several divisional disciplines and each have many applications.

Continue reading Aerospace – Applications for dry and wet / vapour blasting