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Enhancing Hardness in CNC Machined Parts



Achieving optimal hardness in CNC machined parts is crucial for ensuring durability and performance across various applications. As a dedicated OEM CNC machining factory, understanding the methods and factors influencing hardness enhancement is essential.

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1. Material Selection:

Choosing the right material is the foundation for achieving desired hardness levels in CNC machined parts. Materials with inherent hardness properties, such as alloy steels or tool steels, are preferred for applications requiring high hardness. Additionally, materials with heat-treatable characteristics offer flexibility in adjusting hardness through heat treatment processes.



2. Heat Treatment Processes:

a. Quenching:

Quenching involves rapid cooling of the machined part from a high temperature, typically followed by immersion in a quenching medium such as oil or water. This process alters the microstructure of the material, enhancing its hardness.


b. Tempering:

Tempering is a heat treatment process performed after quenching to reduce the hardness and brittleness induced by quenching. Controlled heating to specific temperatures and durations allows for the adjustment of hardness while maintaining desired mechanical properties.


c. Case Hardening:

Case hardening methods like carburizing and nitriding introduce a hardened outer layer on the surface of the part, improving wear resistance and hardness while preserving the core's toughness.

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3. Surface Treatments:

a. Nitriding:

Nitriding involves diffusing nitrogen into the surface of the material at elevated temperatures, forming hard nitride compounds that increase surface hardness and wear resistance.


b. Shot Peening:

Shot peening is a mechanical surface treatment that induces compressive stresses on the surface, enhancing fatigue strength and hardness by inhibiting crack initiation and propagation.



4. Alloying Elements:

Introducing alloying elements like chromium, molybdenum, and vanadium during material composition enhances the hardenability of CNC machined parts. These alloying elements alter the material's microstructure, leading to increased hardness and improved mechanical properties.




5. Precision Machining Techniques:

Utilizing precise machining techniques, including optimized cutting parameters, tool selection, and surface finishing, contributes to achieving desired hardness levels in CNC machined parts. Maintaining proper tool geometry and minimizing tool wear ensures consistent material properties throughout the part.

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Q1: Can hardness be selectively increased in specific areas of a CNC machined part?

A1: Yes, selective hardening techniques such as induction hardening or laser hardening allow for localized hardness enhancement in specific areas of a machined part, offering tailored hardness profiles to meet application requirements.


Q2: How does hardness affect the performance of CNC machined parts?

A2: Hardness influences various mechanical properties of machined parts, including wear resistance, fatigue strength, and load-bearing capacity. Parts with higher hardness levels exhibit improved resistance to wear and deformation, resulting in enhanced performance and longevity.

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