About Lapping and Polishing

Basic knowledge about lapping and polishing, also TDC’s lapping polishing processing examples.

What is Lapping?

Lapping is a processing method in which a product is placed on a flat disk-shaped table called a lapping machine.
Abrasive will be poured on the product, and pressure will apply from above and below to polish the product.
We have both wet and dry lapping excipents, and which to use depending on the required accuracy and finish.

General processing applications are wafers, which are materials for manufacturing semiconductor devices, lenses for cameras and microscopes.
We also often lap items that are often used for parts and processed products whose surface needs to be polished.

Examples of TDC’s lapping process

Micron Cube

マイクロキューブ

We have created very small cubes with lengths of 50 μm, 100 μm, and 150 μm on each side that are barely visible.
By lapping each surface patiently this tiny microcubes are made.
Experiments were conducted to investigate the effects of contamination and this item was used instead of several sizes of dust and dirt on a device.

The edges are very sharp, and this item is one of the products that covers TDC technology.
Problems such as burrs, chips, and sagging can occur when this tiny items is made by general cutting / grinding / polishing, but with TDC technology sharp edges without burrs, chips, and sagging can be made.
Also dimensional tolerance is less than +/- 1 μm , and smooth surfaces are realized at the same time by TDC’s technology.
The cube is so small that we paid close attention to the packaging so that it wouldn’t fly away and be lost when opened.

Middle convex finish

By adjusting the surface plate of our lapping machine, we can make flat surfaces, convex surfaces, concave surfaces, etc.
In addition to this machine, TDC checks the accuracy during processing many times to achieve the desired specifications with good reproducibility at a low price.

Large size processing of materials that are difficult to process (such as molybdenum)

Molybdenum is one of the materials that are difficult to put in precision because of it’s hardness and distorted.
This request was also under the condition that the plate was large and very thin.
In response to requests from foreign customers who had trouble with applications where flatness is extremely important, we tried many times by changing the process and method and received high praise for the finish.

Regardless of the material and shape, we can handle precision processing for all kinds of polishing, such as the small items to large size up to 800 mm.
Please feel free to contact us for more information.

Feel free to contact us for any inquires.

How lapping works

Different from “Fixed abrasive grain polishing”, lapping is a free-abrasive method that uses a suspension of abrasive grains and liquid.

Since there is no binder to connect the abrasive grains, they directly grind the surface of the product, so it can be polished uniformly and stably.
Lapping it is widely used in the semiconductor and optical fields where ultra-precision processing is required for this reason.

However, while it has the advantage of being able to produce high quality in a stable manner, it has the disadvantage of taking too much processing time when the requirements are reducing a large amount of thickness or changing the shape.

Advantages of Lapping process

The advantage of lapping is that it is grinds with a very small force using tiny abrasive. Therefore, it is possible to achieve the desired accuracy without giving any stress to the product.
It also matches those that require a smooth surface. Lapping is one of the processing methods that does not cause distortion due to processing heat.

Creating a smooth surface can also be effective from the viewpoints of achieving high-precision assembly as a part, improving optical characteristics, managing friction characteristics, and preventing rust.

Disadvantages of Lapping process

The advantage of lapping is that it is grinds with a very small force using tiny abrasive.
Therefore it is possible to achieve the desired accuracy without giving any stress to the product.
It also matches those that require a smooth surface. Lapping is one of the processing methods that does not cause distortion due to processing heat.

Creating a smooth surface can also be effective from the viewpoints of achieving high-precision assembly as a part, improving optical characteristics, managing friction characteristics, and preventing rust.

What is the difference between Polishing?

The difference between lapping and polishing lies in the finishing process.
Lapping is a method of efficiently processing into the desired shape and quality by using hard tools and abrasive grains that are 0ver 10 um.
Polishing refers to using small abrasive grains that are less than 10 um and a soft tool (polisher) such as felt or plastic to smooth the rough surface after grinding.
Usually the very last mirror surface finish process is called polishing.

Polishing Process

Contact TDC about polishing any time!

Lapping and polishing has the advantage of being able to polish evenly, but also the disadvantage of taking time due to process little by little.

In addition, it is very important to be familiar with these characteristics in order to finish the product carefully.
TDC can achieve high accuracy by selecting the processing method and abrasive material according to the content.
In addition to being able to deliver according to your desired delivery date, we can also offer it at a low price.
We have accumulated unique technological development and know-how in processing, and can handle any shapes. Please feel free to contact us for any inquiries regarding processing or concerns.

Feel free to contact us for any inquires.

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