Application of CBN tools in the field of wear-resistant castings

With the transformation and upgrading of manufacturing industries such as heavy mining machinery, more and more high-hardness wear-resistant parts are widely used, such as pump casings, linings, impellers, rolls, rolling mortar walls, etc., which are typical parts of various industries. The common point is that the hardness is high, the allowance is large, and the wear resistance and impact toughness of the cutting tool are relatively high.

As one of the important tools to promote the development of the manufacturing industry, only by constantly adapting to the times and developing high-quality, high-performance and high-efficiency tool products can better meet the needs of the manufacturing industry.

For high-hardness wear-resistant castings, Halnn Superhard has made technological innovations, and its cutting tools are unique in the field of high-hardness wear-resistant castings. And form a complete set with enterprises to provide "tailor-made"-style program services, and achieved gratifying results.

For example, the BN-K1 grade of integral polycrystalline CBN tool that has set off a revolution in cutting technology in the field of high-hardness wear-resistant iron castings, such as the overall CBN grade BN-S20 developed for rough machining and intermittent machining of wear-resistant steel materials grade. And obtained the unanimous recognition of domestic and foreign industries, and exported to industrialized countries in Europe and the United States.

The following is a division and introduction according to the material of the wear-resistant parts.

(1) Wear-resistant iron castings

Typical parts of wear-resistant cast iron include pump casing, impeller, cast iron roll, etc., which are all consumable parts, so high-chromium cast iron is often used as the main application material to improve its durability.

The processing difficulties of wear-resistant iron castings are: (1) high hardness, large allowance, and high requirements for tool wear resistance; (2) some workpieces have intermittent cutting, which requires high impact toughness of tools; ( 3) For example after a large roll is a cast, the surface is often accompanied by casting defects such as sand inclusion and pores, and the performance requirements of the tool are increased again.

For wear-resistant iron castings, Halnn Superhard recommends BN-K1 grade CBN cutters. The hardness of the cutter itself reaches HRC95-100. And BN-K1 grade CBN tool has its special binder to improve heat resistance and ensure more stable cutting. Excellent wear resistance, long service life, the first choice for heavy-duty cutting.

In addition, under the condition of strong interrupted cutting, a large amount of workpiece allowance can be cut, which greatly improves production efficiency and reduces production costs. The specific cases are as follows:

Workpiece material: Cr26

Workpiece diameter: 600mm

Processing operation: rough machining

Tool Grade: BN-K1

Tool model: SNMN series

Cutting parameters: speed 10r/min; feed 0.35mm/r; cutting depth 1.5mm

Processing method: dry cutting

Processing effect: Compared with homogeneous products, the BN-K1 grade CBN tool has no break and has high durability, which greatly improves production efficiency

(2) Wear-resistant steel castings

The typical parts of wear-resistant steel castings are the lining plate and the rolling mill wall. The processing difficulties are (1) high hardness, large allowance, and difficult to process; (2) some workpieces are severely hardened and require high cutting tools. .

For wear-resistant steel castings, Halnn Superhard recommends BN-S20 grade integral polycrystalline CBN inserts. It has excellent wear resistance and impact toughness. It is a material specially developed for high-hardness steel parts. It can also withstand strong interrupted cutting conditions,

For example, the common material of rolling mortar wall parts is high manganese steel. The difficulty of processing lies in the serious work hardening, which requires as few passes as possible to reduce work hardening and improve production efficiency. Compared with traditional tools, Halnn superhard CBN tool BN-S20 has more advantages. The specific cases are as follows:

Workpiece: Crushing cone

Workpiece material: high manganese steel

Processing operation: milling

Inserts type: BN-S20 SNMN120712

Cutting parameters: ap=2.5mm; Fr=0.2mm/r; Vc=135m/min

Processing method: dry cutting

Processing effect: