CBN Inserts Machining High Manganese Steel Crushing Cone

High manganese steel crushing cone are a core wear-resistant component of cone crushers, and their machining quality directly affects crushing efficiency and equipment stability. Traditional machining methods often suffer from low efficiency and high tool wear when dealing with the characteristics of high manganese steel, such as strong work hardening, high toughness, and easy tool sticking. The emergence of CBN (cubic boron nitride) superhard tools provides a revolutionary solution for the efficient and precise machining of high manganese steel crushing cone, becoming a core technological support for the manufacturing of high-end wear-resistant components.

Core Characteristics of High Manganese Steel

1.Extremely strong work hardening effect: During cutting, the surface metal undergoes rapid plastic deformation, with hardness soaring from HB200-250 to HB500-800. Subsequent cutting is equivalent to machining high-hardness hardened steel, making ordinary tools prone to chipping and excessive wear.

2.High toughness and high viscosity: The austenitic structure endows high manganese steel with excellent toughness, easily generating continuous ribbon-like chips during cutting. This chips rub intensely against the tool’s rake face, causing tool sticking and affecting machining accuracy and surface quality.

3.Complex component structure: The crushing cone is mostly an irregular rotating body structure, containing complex features such as curved surfaces and steps, placing extremely high demands on the tool’s wear resistance, impact resistance, and cutting stability.

CBN cutting tools, with their inherent advantages such as high hardness, excellent heat resistance, and strong chemical inertness, are perfectly suited for the machining needs of high manganese steel.

Machining Process Optimization 

1. Roughing Stage: Utilize CBN indexable cutting tools for large-scale material removal, prioritizing efficiency. Leave a 0.5-1mm finishing allowance to prevent the hardened layer from rough machining from affecting finishing quality.

2. Semi-Finishing Stage: Use CBN welded cutting tools to correct the workpiece shape and dimensions, eliminate residual stress from rough machining, further refine the machined surface, and lay the foundation for finishing.

3. Finishing Stage: High-precision PCBN cutting tools are selected, combined with the constant linear speed control function of CNC lathes or machining centers, meeting assembly accuracy requirements.

Application Case

A large mining machinery manufacturing enterprise used SCBN TOOLS CBN cutting tools to machine ZGMn13 material crushing cone (1200mm in diameter, 800mm in length). Compared with traditional carbide cutting tools, significant improvements were achieved:

1.Machining efficiency: Single-piece machining time was reduced from 12 hours to 4.5 hours, increasing production capacity by 167%

2.Tool life: A single tool can machine 8-10 workpieces, improving efficiency by 7 times compared to carbide tools(which can only machine 1-2 workpieces)

3.Machining quality: Surface roughness was consistently below Ra2.0μm, geometric tolerances were controlled within 0.015mm, and assembly pass rate increased from 92% to 99.5%.