Metal Polishing Services - Best Refinishing & Buffing On Junying

Junying Metal Polishing Services – Polishing Surface Treatment for Die Casting Products

Based on decades of experience in mold making and metal die casting service, we know that aluminum polishing service is important to aluminum casting because the die casting products are often rough after the manufacturing and require surface treatment to get smoother edges, precise measurements, and better surface quality. Metal polishing services at diecasting-mould.com are our major finishing services to improve the exterior of your aluminum die castings and other alloy die cast parts. Polishing surface treatment can remove parting lines and overflows from the die casting process, and heat checking or die washout on old casting surfaces, as well as enhance the safe treatment and increase the aesthetics of die casting components. The accomplished team at Junying die casting plant will follow the safety guideline and industry practices to deliver high-quality polished castings. We can transform your design into a fully finished product, all in-house.

Why Choose Our Metal Polishing Services

Start-to-finish fabrication and finishing company
Reduced production costs, high efficiency and exceptional consistency
Strict quality control and inspection throughout each stage
Prompt communication to discuss all your metal polishing needs
Visible project timeline and on-time delivery

What is Metal Polishing?

Polishing is a finishing operation designed to refine the outer layer of a metal part by rubbing it against an abrasive medium or a rotating wheel. The process serves several practical purposes: it enhances outward appearance, guards against dirt or fingerprints, eliminates surface oxidation, and boosts shine or reflectivity. Though people often use the terms interchangeably, polishing differs from buffing. In polishing, the abrasive is bonded directly to the wheel’s surface, while in buffing, loose grit is sprinkled onto the wheel during operation. A typical polishing procedure employs a soft pad sprinkled with fine or ultra-fine powder combined with a small amount of polishing compound fluid. Together they produce the glass-like finish that many users seek. Because the technique is meant to refine rather than reshape, only the tiniest fraction of base metal is removed, just enough to fill scratches and level the surface. The condition of the substrate before work begins dictates the choice of abrasive grade. Finished components, such as polished aluminium die-cast housings, are frequently treated with a protective coating of wax, oil, or clear lacquer to hinder further oxidation and prolong service life.

Details of Our Metal Polishing Services

Material	ADC12, aluminum alloys, metals, etc.
First Layer Processing	Polishing
Second Layer Processing	Spray painting
Third Layer Processing	Adding a protective layer
Equipment	hand polishing tools, buffing wheels, deburring machine, etc.
Applications	electronics, lock parts, furniture, communications, medical, etc.

The Process of Polishing & Buffing Service

Purpose of Polishing

Smooths the metal surface for improved brightness or a mirror-like appearance. Enhances both aesthetics and functional performance.

Mechanical Techniques

Hand polishing for fine detail work. Buffing with motorized wheels for even shine. Grinding with abrasive belts to remove larger imperfections. Sanding with progressively finer grit paper for refinement.

Chemical Treatments

Passivation to improve corrosion resistance. Anodization to enhance appearance and durability.

Finish Options

Brushed satin look for a softer sheen. True mirror finish for maximum clarity and reflectivity.

Industrial Benefits

Essential for hygiene in food-processing and medical equipment. Removes micro-scratches where bacteria could collect. Extends operational life and ensures safer usage.

Advantages of Polishing Surface Treatment

Surface Treatment: The primary advantage lies in its ability to erase surface flaws. Polishing removes light scratches, manufacturing nicks, fine swirls, and other blemishes, leaving the metal with a visibly smoother, more uniform finish.
Enhances Shine and Aesthetics: Polishing gives metal components a high-gloss, mirror-like shine that instantly elevates their appearance. This bright, even finish signals quality and craftsmanship, helping parts to look both premium and professional.
Improves Surface Durability: Beyond looks, polishing adds a layer of durability. The fine, smooth layer acts almost like a sealant, toughening the surface and guarding it against scratches, chips, and the daily wear that can sap a metal’s lifespan.

Reduces Wear and Corrosion: Because polished surfaces are so smooth, they resist friction, corrosion, and chemical attack better than rougher finishes. This property makes polished metals especially valuable in demanding settings, from factories and hospitals to bridges and open-air machinery.
Low Maintenance and Easy Cleaning: A shiny, polished finish requires surprisingly little upkeep. Since the surface is non-porous, it repels dust, oil, and residues that usually cling to textured metals, shortening cleaning times and cutting the frequency of maintenance.
Ensures Uniform Surface Quality: The polishing process produces a consistent sheen from edge to edge, eliminating dull spots or uneven textures. This uniformity is crucial in decorative items, precision instruments, and any application where reliability and aesthetics must work in concert.

Metal Polishing Services Applications

Architectural & Structural Applications

Stair railings, handrails, and guard rails, or metal stairs and stair components

Residential & Commercial Interior Design

Custom kitchen hoods or furniture and ornamental pieces

Industrial & Manufacturing

Electrical enclosures, tool manufacturing, parts manufacturing, custom metal fabrication projects

What Metal Polishing Services Offered at Junying?

1. Hand Polishing

For precision finishing and onsite touch-ups, Junying provides dedicated hand-polishing services that are perfect for achieving a brushed texture or perfecting spots needing extra care. This technique is frequently applied to stainless steel, copper, and brass components to create a uniform, artisanal look.

2. Grinder Finishing

At Junying, we offer tailored grinder finishing for decorative as well as functional metal surfaces. Thanks to a variety of in-house patterns that can be reproduced at scale, the process works well on steel, stainless steel, aluminum, copper, and brass, providing owners with both a sturdy surface and a distinctive look.

3. Cloth Buffing (Mirror Polishing)

When a high-gloss, mirror-like sheen is the goal, Junying turns to cloth buffing wheels loaded with polishing compounds. The method shines brightest on stainless steel, aluminum, copper, and brass, making it the go-to choice for decorative railings, lighting fixtures, and other architectural elements that demand a flawless shine.

4. Orbital Sanding (Non-Directional Finish)

For an angel-hair or satin finish, Junying employs orbital sanders set to an even orbital motion. This approach leaves behind a subtle, non-directional texture that feels smooth to the touch and appears modern, lending itself well to contemporary metalwork crafted from steel, stainless steel, aluminum, copper, and brass.

5. Directional Sanding (Brushed Finish)

We also provide directional sanding with large-format belt sanders, a technique perfected for producing consistent brushed finishes. The process has become a favourite for stainless-steel appliances, panels, and trim, while also suiting aluminum, copper, and brass components that benefit from a tidy, linear grain.

Metal Polishing Specifications

3 Finish (Grinding or Rough Grinding): This initial grind is typically completed with abrasives ranging from 60 to 180 grit. The technique produces a coarse and evenly distributed scratch pattern that leaves the surface dull rather than shiny. Commonly referred to as grinding or rough grinding, this finish is practical in environments where function outweighs cosmetic appeal.
Architectural Finish (No. 4 Brushed or Satin Finish): The No. 4 finish begins with polishing belts or wheels in the 120 to 180 grit range and is later refined with 80 to 120 grit compounds or non-woven pads. The result is a series of straight, parallel lines that catch light without being overly reflective, giving the material its signature satin look. Because of its balanced appearance and durability, this finish is often seen on elevator doors, kitchen appliances, and decorative architectural trim.
RA Finish (Roughness Average Finish) : The RA finish looks similar to the brushed surface, yet it is specified by a measurable roughness average value, typically expressed in micrometers. Maintaining this precise metric makes the finish suitable for applications in pharmaceutical plants, laboratories, and certain manufacturing environments where surface texture can influence cleaning efficacy or fluid dynamics. Visually, it is less glossy than the architectural finish, displaying a controlled matte texture instead.
Dairy or Sanitary Finish: Intended for the food processing, beverage, and medical sectors, the dairy or sanitary finish focuses on hygiene as its primary concern. During preparation, any pitting or micro-imperfection must be completely eliminated to avert areas where bacteria could thrive. To achieve this, the metal is initially polished with 180 to 240 grit abrasives and then buffed with finer compounds until the surface is mirror-smooth and easy to disinfect. Stainless steel is almost exclusively the substrate of choice due to its corrosion resistance and cleanability.
Process Finish: This is what the part looks like right after it comes out of the primary forming operation—whether spun, drawn, or otherwise shaped. You can still see the tell-tale draw lines or spin lines, and there may be a light film of oil or traces of dust that collected during handling. The finish is anything but uniform: some areas are marginally shinier where the metal was compressed more, others show sharper tooling marks because the deformation was lighter.
Wash Finish: The wash finish is basically a second step designed to tidy up that original process surface. Parts are immersed in a gently heated, mildly alkaline bath that dissolves oils, frees embedded metal fines, and flushes away assorted surface debris. While the finish certainly looks better afterward—cleaner and somewhat brighter—the underlying surface contours remain untouched.
Mechanically Cleaned Finish: Here, workers wipe down or blast the part with mineral spirits, kerosene, or similar mechanical solvents until grease and grime are gone. Once completed, the surface appears uniformly clean and dry, making it a practical prep step for operations like painting, powder-coating, or final assembly.
Passivated Finish: Primarily applied to stainless components, passivation treatments boost corrosion resistance by selectively removing free iron from the surface. The process leaves behind a thin, adherent oxide layer that protects the underlying metal. Even though Junying has the equipment, we sometimes subcontract this finish when customers need exceptionally high resistance to aggressive chemicals.
Electropolished Finish: Electropolishing takes cleanliness and smoothness to an entirely different level. By running an electric current through an electrolyte bath, we dissolve minute peaks from the surface, yielding a nearly mirror-like shine. This ultra-smooth finish is crucial for high-purity environments such as those found in pharmaceuticals, semiconductors, and certain food-processing lines. Because the setup is capital intensive, we usually partner with a specialty vendor to have it done.

FAQ

1. Polishing Materials Supported at Junying

Stainless Steel
Aluminum
Steel
Copper
Brass

2. What is the difference between buffing and polishing?

Polishing generally refers to abrading the surface of a metal in order to eliminate minor flaws while simultaneously deburring the substrate so it feels even to the touch. This step prepares the material for a higher level of luster. Buffing, in contrast, is the concluding operation: it employs softer cotton or felt wheels charged with compound to raise the surface to a bright, mirror-like gleam. In brief, polishing perfects the texture and buffing amplifies the gloss.

3. How much should a shop charge to polish a car?

The cost of car polishing varies depending on the vehicle size, condition, and service level. On average:

Basic polish: $50–$150
Full polish with paint correction: $200–$500+
Luxury vehicles or heavy oxidation removal can push the price higher. Professional detailing shops usually offer packages based on finish quality.

4. Are you equipped to manage extensive polishing projects?

Certainly. Whether the assignment involves small fasteners or sweeping architectural girders, our facility is outfitted with heavy-duty tooling and production machinery designed to deliver uniform polishing at scale. This industrial capability empowers us to tackle high-volume runs and oversized parts without sacrificing the dimensional accuracy and finish quality that our clients expect.

5. Do you offer custom metal polishing solutions?

Yes, customized solutions are where we shine! We can tailor our polishing services to meet the specific requirements of any project.

6. Can you handle large metal polishing projects?

Of course! We can do it all. From small parts to large structural or decorative pieces, our shop has the tools, equipment, and experience to complete large projects.