What types of post-processing are available for CNC machined parts?

What is the difference between post-processing and surface finishing of CNC machining parts?

Post-processing and surface finishing are two different processes in CNC machining. 

Surface finishing is the process of improving the surface quality of a machined part. This can include smoothing out rough edges, polishing the surface to a high shine, or applying a coating to protect the part from corrosion. Surface finishing is often done for aesthetic reasons or to improve the part’s functionality. It frequently includes sandblasting, anodizing, polishing and various coating treatments.

Post-processing refers to any additional steps taken before the final product is finished. This can include deburring, heat treatment, and cleaning polishing to ensure the part meets the required specifications. Post-processing services are an important part of CNC machining that can help improve the machined parts’ functionality, appearance, and overall quality. Here are some common post-processing services for CNC machined parts.

A variety of Surface Treatment Selection Guide

Deburring: Deburring removes sharp edges, burrs, and other imperfections from the part after machining. Deburring can improve the safety and functionality of the part and make it more comfortable to handle.

Tumbling: Tumbling is a process that involves placing the part in a rotating barrel with abrasive media to create a smooth and polished surface finish. Tumbling can improve the appearance and feel of the part and remove any remaining burrs or imperfections.

Heat treatment is a common application for CNC machining parts, as it can improve their mechanical properties, such as hardness, strength, and toughness. Heat treatment involves heating a material to a specific temperature, holding it at that temperature for a certain amount, and then cooling it to room temperature at a controlled rate.

The type of heat treatment applied to CNC machining parts depends on the material used and the desired properties. Some common heat treatments include:

Annealing: This involves heating the material to a high temperature and cooling it slowly. This process helps to reduce internal stresses, improve flexibility, and soften the material.

Tempering involves heating the material to a moderate temperature and then cooling it down slowly. This process helps reduce the material’s brittleness created by hardening and improves its toughness and flexibility.

Hardening involves heating the material to a high temperature and cooling it rapidly, usually by quenching it in water or oil. This process creates a hard, brittle material resistant to wear and deformation.

High-frequency heating involves heating the material’s surface to a high temperature while keeping the core cooler. This process creates a hard surface layer that is resistant to wear while the core remains relatively soft and pliable.

Method of stress relieving is typically used to remove residual stresses which have accumulated from prior manufacturing processes. There are many ways to eliminate tensile residual stress at the surface, such as mechanical treatment, including mechanical vibration, peening shot etc.; diffusion treatment, including carburizing and nitriding; heat treatment, including annealing, tempering and other heat treatment process, usually performed by heating to a low temperature and holding at that temperature for the required time, to achieve the desired reduction in residual stresses.

Heli-Coil inserts are used to provide stronger threads in materials that are prone to stripping or cross-threading. The inserts are designed to be installed into an existing hole, creating new threads that are stronger than the original threads. Improving the strength and durability of the threaded connection. It also can be used to repair damaged screw threads in soft alloy components. Its advantages make it a popular choice to extend life by providing a more durable thread less prone to wear and tear.

Assembly: The process of assembling multiple CNC machined parts to create a complete product. Assembly can involve adhesives, fasteners, or other methods to attach the parts securely.

conclusion

Overall, post-processing services can improve CNC machined parts’ functionality, appearance, and quality. The specific post-processing services required will depend on the material of the part, its intended use, and the desired properties and appearance. Working with an experienced CNC machining service provider can help ensure that your parts receive the necessary post-processing services to meet your specific requirements.

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