Tech Team · Kintek Solution

The tolerances for laser sintering can be very precise, often within microns, depending on the post-treatment processes applied. The standard as-fired precision for internal diameter is typically within +/- 0.02 mm, with a repeatability of less than 10 µm within the same production batch. After diamond grinding, the precision can be enhanced to +/-0.03 mm for length and +/- 0.01 mm for external diameter.

Detailed Explanation:

1. Post-Treatment in a Sizing Press: To achieve high dimensional accuracy, the sintered part undergoes post-treatment in a sizing press. This process involves compressing the workpiece again with axially generated pressure, which helps in achieving exact position and shape tolerances. This step is crucial for maintaining tight tolerances, especially for complex shapes or critical applications.

2. Calibration Step: For parts requiring very tight tolerances, a calibration step is necessary. This involves placing the part back in the press and adjusting it using a calibration die. This process can be performed on both automated and manual presses, though the latter can be more expensive. Calibration ensures that the final dimensions of the part meet the specified tolerances.

3. Precision After Diamond Grinding: Diamond grinding is a critical step that further enhances the precision of the sintered parts. After this process, the length can be controlled within +/-0.03 mm, and the external diameter within +/- 0.01 mm. This level of precision is essential for applications where dimensional accuracy is paramount, such as in the manufacturing of precision components like pistons and cylinders.

4. Control of Powder Consistency and Shrinkage: The consistency of the powder used in the sintering process significantly impacts the final tolerances. Variations in powder consistency can alter shrinkage and overall component properties. Therefore, precise control over the initial forming process is necessary to achieve consistent and repeatable results. Post-forming processes, such as the "cure" phase, also require tight control to set shrinkage precisely and prevent distortion.

5. Special Considerations for Design and Support: During the design phase, engineers must consider factors like gravity, friction, and potential sag issues to prevent warping or distortion of the parts. Techniques such as using spacers, adding support ribs, coining, and employing special setters or ceramic trays can help minimize these issues and ensure the final part meets the required tolerances.

In summary, the tolerances for laser sintering can be tightly controlled through careful management of the sintering process, including post-treatment steps like sizing and calibration, and careful control over the consistency of the powder and the design of the parts. These measures ensure that the final products meet the stringent dimensional requirements of their intended applications.

Discover the precision that sets our laser sintering products apart—sintered parts with dimensions as precise as microns, thanks to meticulous post-treatment processes like sizing, calibration, and diamond grinding. Elevate your manufacturing with KINTEK's cutting-edge technology, where every component is designed to meet the most stringent dimensional tolerances. Experience the quality that delivers consistency and reliability—because in precision, every micron counts. Contact KINTEK today and unlock the potential of your next project with unparalleled precision!