CNC Machining: How to Polish Titanium CNC Machined Parts?

 

Introduction

 

 

In the world of precision engineering and manufacturing, CNC machining has revolutionized the way components and parts are produced. One of the popular materials used in CNC machining is titanium, known for its exceptional strength, low weight, and resistance to corrosion. However, after the CNC machining process, these titanium parts might not have the desired appearance. This article will guide you through the process of polishing titanium CNC machined parts to achieve a flawless, mirror-like finish.

 

 

 

 

Understanding Titanium CNC Machined Parts

 

 

 

What is CNC Machining?

 

CNC machining is a subtractive manufacturing process that involves the use of computerized controls to remove material from a workpiece. This results in the creation of intricate and precise parts that adhere to tight tolerances.

 

 

 

 

 

 

 

The Advantages of Titanium CNC Machined Parts

 

 

Titanium is a sought-after material in CNC machining due to its outstanding properties. It is widely used in aerospace, medical, automotive, and other industries due to its high strength-to-weight ratio, biocompatibility, and resistance to extreme temperatures.

 

 

 

 

The Importance of Polishing in CNC Machined Parts

 

 

After the CNC machining process, titanium parts may exhibit rough surfaces, tool marks, and imperfections that need to be eliminated. Polishing is a crucial step to not only enhance the appearance of the part but also to improve its performance and functionality.

 

 

Titanium is a kind of light metal. The cutting force of CNC machining titanium parts is higher than that of steel of the same hardness. It is commonly used in the fields of aerospace, electronics and other fields in CNC machining. After a period of time, CNC machined titanium parts will lose their luster and surface scratches. Titanium polishing can restore the original metallic luster, such as mirror surface. This article will describe how to clean titanium and CNC machining titanium parts polishing knowledge.

 

 

The polishing process of CNC machining titanium parts is not difficult. It needs to be polished according to the different conditions of the titanium parts, such as scratches and stains that cannot be cleaned.

 

 

 

 

How to clean CNC machining titanium parts?

 

 

Straightness is a form tolerance introduced in GD&T, which is used to indicate that the linear elements on the CNC lathe parts maintain an ideal straight line state, which is commonly referred to as the degree of straightness. Straightness tolerance is the maximum amount of variation allowed by the actual line to the ideal straight line, and there is no benchmark requirement. The standard form of straightness is used to ensure uniform two-dimensional tolerances on the surface of CNC lathe parts, as well as the axis straightness used to control the central axis of the part.

 

 

Step 2: Take out the CNC machined titanium parts and rinse them with clean water. Take a dry soft towel or cotton cloth and gently try the titanium to wipe in circular motions.

 

Note: Do not rub non-ferrous CNC-machined titanium parts.

 

 

 

 

Preparing for Polishing

 

 

 

Ensuring Proper Safety Measures

 

Before proceeding with the polishing process, it is essential to prioritize safety. Wear appropriate protective gear, such as gloves, safety glasses, and a dust mask, to safeguard yourself from potential hazards.

 

 

Gathering Necessary Equipment

 

To achieve a professional finish, gather the required equipment, including sandpaper of varying grits, a polishing wheel, buffing compounds, a microfiber cloth, and a polishing machine.

 

 

 

 

 

Polishing Process of CNC Machining Titanium Parts

 

 

 

After finishing the above two steps, the CNC machining titanium parts have been cleaned up, and the next step is the polishing process of the CNC machining titanium parts.

 

 

 

 

 

 

According to different processing requirements and applications, the methods and tools used in the polishing of CNC machining titanium parts will be different. The following is a brief introduction to the different levels of polishing.

 

 

1) Rough polishing: Use titanium alloy special hemp wheel or wool wheel and special titanium wax to polish the CNC machined titanium parts to achieve a smooth surface. Pay attention to polishing strength and direction.

 

2) Medium polishing: Use titanium alloy special polishing coarse cloth wheel or fine wool wheel and titanium alloy special polishing wax for polishing to remove the lines left by rough polishing until the surface of the product is bright.

 

3) Fine polishing: The titanium alloy special cotton wheel and titanium alloy fine polishing wax are used to make the CNC processed titanium parts achieve high brightness. There are also some slight textures on the surface of titanium products.

 

4) Mirror polishing: Use titanium alloy special bleached cotton cloth wheel and titanium alloy special mirror polishing wax to remove the slight texture on the metal surface.

 

 

 

 

 

Step-by-Step Guide to Polishing Titanium CNC Machined Parts

 

 

 

Step 1: Cleaning the Surface

 

Begin by thoroughly cleaning the titanium part to remove any debris or contaminants. Use a mild detergent and water, followed by rinsing and drying the part completely.

 

 

Step 2: Sanding the Part

 

Start with sanding the surface using sandpaper with a lower grit to eliminate tool marks and surface irregularities. Gradually move to higher grit sandpapers for a smoother finish.

 

 

Step 3: Buffing the Surface

 

Using a polishing wheel with a buffing compound, carefully buff the titanium part. This process will further refine the surface and prepare it for the final polishing stages.

 

 

Step 4: Applying a Polish Compound

 

Apply a high-quality polish compound to the part's surface. Use a soft cloth to work the polish into the material, ensuring even coverage.

 

 

Step 5: Final Polishing

 

Utilize a clean polishing wheel and buff the part until achieving a brilliant, mirror-like shine. Check the part from various angles to ensure consistency in the finish.

 

 

 

 

Tips for Achieving a Mirror-Like Finish

 

 

• Maintain a steady hand and consistent pressure during polishing.

 

• Use a polishing machine with adjustable speed for better control.

 

• Always follow the grain direction while sanding.

 

• Regularly clean and replace polishing wheels to avoid cross-contamination.

 

 

Common Mistakes to Avoid

 

• Applying too much pressure, which can damage the part.

 

• Using old or contaminated polishing compounds.

 

• Neglecting safety precautions during the polishing process.

 

 

 

Protecting Polished Titanium CNC Machined Parts

 

 

Using Protective Coatings

 

After polishing, consider applying a protective coating or clear sealant to preserve the polished surface and prevent tarnishing or oxidation.

 

 

Proper Storage Techniques

 

When storing polished titanium parts, use soft materials to protect them from scratches and avoid exposure to harsh environmental conditions.

 

 

Maintaining the Polished Surface

 

Maintaining the polished surface is essential for its longevity. Regularly clean the part using mild soap and water, and avoid abrasive cleaning agents.

 

 

 

Summarize

 

 

Polishing titanium CNC machined parts is a crucial step in the manufacturing process to achieve a flawless and aesthetically pleasing surface. By following the step-by-step guide and using the right techniques and equipment, you can produce stunning results that enhance both the appearance and functionality of the components.

 

It should be noted that the above-mentioned process of polishing of CNC machining titanium parts requires professional polishing technology and proficiency in order to meet the polishing requirements, which is mainly manifested in the details of polishing force, speed, direction and so on. VMT provides professional polishing services for CNC machining titanium parts, as well as sandblasting, anodizing, painting, powder coating, passivation and more metal surface treatment services.