Precision Machining
- CNC Machining Service
- CNC Milling
- CNC Turning
- Automatic Turning
- Machining Screw/Rivet
- Wire EDM Machining
- Casting & CNC
- Aluminum Profile & CNC
- Cold Heading & CNC
LML Metal Products Ltd.No. D309, Yunchuang E Valley, No. 3 Huanshi West Road, Tangxia Town, Dongguan City, Guangdong,China
(86) 17833674102dlynn9527@gmail.com
Smooth Machining
Smooth Machining Services
Smooth Machining delivers clean, defect-free metal surfaces by removing burrs, sharp edges, and irregularities from machined parts. This essential finishing process achieves a uniformly smooth texture while maintaining critical dimensions, improving both functionality and visual quality.
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Our LML Smooth Machining
We customize surface finishes based on client specifications and functional needs. While options range from protective coatings and complex textures to specialized polishing, Smooth Machining serves as our essential baseline process, ensuring every part leaves our facility clean and functional.
Our standard Smooth Machining delivers burr-free surfaces with controlled roughness (typically Ra ≤ 1.6 μm), eliminating sharp edges and tool marks. This satisfies critical functional requirements including precision assembly fit (shafts, housings), reliable sliding contact, fluid sealing integrity, and visual cleanliness for industrial machinery, automotive components, jigs, and functional prototypes. It guarantees safety and reliability when complex coatings aren’t needed.
Ra values (e.g., 0.4μm for fine finishes, 3.2μm for industrial grades) efficiently specify general-purpose smoothness for non-critical fits or aesthetic parts. Rz better predicts functional performance where peak irregularities matter – such as bearing contact, fluid sealing surfaces, or coating adhesion. Choosing between Ra and Rz depends on functional needs: Ra for consistent texture control, Rz for critical interfaces. Additional parameters like Rmax (single worst-case peak-to-valley) or Rq (RMS average) address niche requirements, but Ra and Rz remain the essential benchmarks for industrial specifications.
Smooth Machining Servcie
Various anodization primarily recognized as Type I-Chromic Acid Anodize, Type II-Sulfuric Acid Anodize, and Type III Hard Anodize or Hardcoat from the Mil-A-8625 specification. Less prevalent alternatives encompass phosphoric acid anodize and titanium anodize. Anodization engenders a porous matrix that develops atop the foundational aluminum substrate, facilitating substantial absorption of pigmented dyes.
Sulfuric Acid Anodize:
The sulfuric acid process is the most common method for anodizing. The sulfuric acid anodize process films range from .0001"-.001" thick. The overall thickness of the coating formed is 67 percent penetration in the substrate and 33 percent growth over the original dimension of the part. It is particularly suited for applications where hardness and resistance to abrasion is required.
The porous aluminum oxide absorbs dyes well, and subsequent sealing helps to prevent color loss in service. Although dyed anodized films are reasonably colorfast, they have a tendency to bleach under prolonged direct sunlight.
Some of the colors are: Black, Red, Blue, Green, Urban Grey, Coyote Brown, and Gold. Parts can be treated chemically or mechanically prior to anodizing to achieve a matte (non-reflective) finish.
Consistency Requirements
- Less expensive than other types of Anodize with respect to chemicals used, heating, power consumption, and length of time to obtain the required thickness.
- More alloys can be finished.
- Harder than chromic anodize.
- Clearer finish permits dying with a greater variety of colors.
- Waste Treatment is easier than chromic anodize, which also helps to reduce cost.
Sulfuric Acid Anodize Applications:
- Optical components
- Military weapons
- Mechanical hardware
- Hydraulic valve bodies
- Computer and electronic enclosures
Hard Anodize (Hardcoat):
Hardcoat anodize, while usually done in a sulfuric acid based electrolyte, is much thicker and denser than the more conventional sulfuric anodize. Hardcoat is specified for aluminum components subject to extreme wear applications where superior abrasion resistance is needed, or corrosive environments where a thicker, harder, more durable coating is necessary.
It can also be valuable where enhanced electrical insulation is required. Since hardcoat anodize can be built up to several thousandths in some cases, it makes this type of anodize a candidate for salvaging worn or mis-machined components.
Consistency Requirements
- Improved wear resistance
- Non-conductive
- Improve parts surface for slide applications
- Can repair worn surfaces on aluminum
- Can be black dyed; other colors less decorative
- Finish is harder than tool steel
- Can be ground or lapped
Sulfuric Acid Anodize Applications:
- Valves
- Pistons
- Sliding Parts
- Sliding Parts
- Insulation Plates
- Hinge Mechanisms
- Cams
- Gears
- Gears
- Blast Shields
Example of smooth machined part
Roughness options for Smooth Machining
The color of anodized finishes may exhibit some degree of variation due to standard alloy tolerance differences. Please refer to the color scheme below to observe the range of available colors.* We supply a range of standard colors (see Color options). If you need a particular RAL or Pantone color code, please contact sales@lmlmetal.com
Black (Black MLW)
Similar to: RAL 9004, Pantone Black 6
Clear
Similar to: depends on material
Red (Red ML)
Similar to: RAL 3031, Pantone 1805
Blue (Blue 2LW)
Similar to: RAL 5015, Pantone 3015
Orange (Orange RL)
Similar to: RAL 1037, Pantone 715
Gold (Gold 4N)
Similar to: RAL 1012, Pantone 612
All colored surface treatments (anodizing/powder spraying/painting, etc.) will have color difference, which is reflected in several aspects: 1. Different product sizes, even if the material is the same and the color is the same, there will be color difference, the aluminum box There will be color difference between the body and the cover 2. There will be color difference between different batches, because the oxidation time and coloring effect cannot be guaranteed to be exactly the same 3. If the same color is anodized without using different grades of the same material, there will be color difference 4. Different surface treatment types will have color difference, such as anodizing and powder spraying, if you choose the same Pantone color card number, there will also be color difference
Color options for aluminum anodizing
| Type | Impracticable situation | Features | Thickness（μm） | Application | Colors | PIC |
|---|---|---|---|---|---|---|
| Chromic acid (Type |) | a.Aluminum alloy parts with copper content > 5% b.Aluminum alloy parts with copper and silicon content > 7.5% | maintains the accuracy and surface roughness of original parts ,well bonding preformance | 3μm | a.1. Lap, riveted, welded or complex shaped parts b. Parts with high precision and low roughness | black,other color is imparctical |  |
| Sulfuric acid (Type II ) | Lap, spot weld or riveted part | the most common type of anodizing，can dye with a greater variety of colors | 0.5~20μm | The part that need brighten appearance or special color, as decoration or identification mark. | Black, Red, Blue, Green, Coyote Brown, Urban Grey, and Gold,allow for practically any hue | |
| Hard Anodize (Type 1I) | Parts with high fatigue performance requirements | superior abrasion performance and electrical insulation，HV＞420 | 30~120um | valves/hinges/cams/gear/insulation plates | black,other colors are less ornamental | |
| Organic acid (Type IC) | uneven and amorphous black regions develop. | Anodizing can produce yellowish integral colours without dyes if it is carried out in weak acids with high voltages, high current densities, and strong refrigeration. | upto50um | Integral colour anodizing | pale yellow, gold, deep bronze, brown, grey, and black | |
Tolerance for all surface preparation are held after anodizing.
Gallery of anodized parts manufactured by LML
The color of anodized finishes may exhibit some degree of variation due to standard alloy tolerance differences. Please refer to the color scheme below to observe the range of available colors.* We supply a range of standard colors (see Color options). If you need a particular RAL or Pantone color code, please contact sales@lmlmetal.com
Knurling
chamfering
Grinding
Heat Treatment
welding
riveting
Aluminum Anodizing Process By Lml
The aluminum anodizing process involves sequential steps for improving surface properties and appearance.
- * Degreasing: Aluminum is cleaned to remove dirt and contaminants.
- * Rinse: Cleaned aluminum is rinsed to eliminate residual agents.
- * Polishing: Chemical or electrochemical polishing smoothens imperfections.
- * Anodizing: Aluminum is immersed with a cathode in an electrolytic solution. Electric current
causes controlled oxidation, forming a substantial aluminum oxide layer.
- * Activation: The surface is activated for effective dye absorption.
- * Dyeing: Pigments or dyes enter aluminum oxide pores, adding color options.
- * Sealing: Immersion in a sealing solution closes pores, enhancing durability and corrosion resistance.
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FAQs
LML takes the stress out of manufacturing by guaranteeing the quality and consistency of every part. Each order is dimensionally and visually inspected by our in-house quality control team to make sure it meets the LML Standard. If you’re not satisfied with your order, we’ll remake your parts as fast as possible, free of charge, or refund you - whichever you prefer.
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LML Metal Products Ltd.No. D309, Yunchuang E Valley, No. 3 Huanshi West Road, Tangxia Town, Dongguan City, Guangdong,China
(86) 17833674102dlynn9527@gmail.com
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