Polttopinta

Polttopinta, also known as burnishing, is a metalworking process that improves the surface finish and mechanical properties of a metal part. The process involves pressing a burnishing tool against the surface of the metal at high pressure and temperature, causing the metal to flow and creating a smooth, mirror-like finish. This process is commonly used in the manufacturing of precision components, such as gears, bearings, and shafts, where a high-quality surface finish is required.

The burnishing process can be performed using various tools, including rollers, balls, and brushes, depending on the shape and size of the component being treated. The tool is typically heated to a temperature above the recrystallization temperature of the metal, which allows the metal to flow and conform to the shape of the tool. The pressure applied during the process is typically in the range of 500 to 1000 MPa, depending on the material and the desired surface finish.

The benefits of polttopinta include improved surface finish, increased wear resistance, and enhanced fatigue strength. The process can also reduce the need for subsequent finishing operations, such as grinding or polishing, which can save time and cost in the manufacturing process. However, the process is limited to materials that can be heated to the required temperature without causing damage or distortion, and the equipment required for the process can be expensive.

In summary, polttopinta is a metalworking process that improves the surface finish and mechanical properties of a metal part by pressing a heated tool against the surface at high pressure. The process is commonly used in the manufacturing of precision components and offers several benefits, including improved surface finish and increased wear resistance. However, the process is limited to certain materials and can be expensive.