Overview of Milling Inserts

This document provides detailed technical information on Hitachi milling inserts, covering material grades, coatings, designations, specifications, product listings, and stock status to support optimal selection and application in machining processes.

1. Material Grades and Selection Criteria

Insert grades are matched to workpiece materials such as carbon steels, alloyed steels, tool steels, cast irons, stainless steels, non-ferrous metals, super alloys, and titanium. Each material group has recommended insert grades (carbide, coated carbide, cermet) optimized for finishing, general, or rough cutting. Examples include EX35, WH10, PT, H08M, AT, PC, BH, JX, CY, SD, and HD.

2. Coating Materials for Milling Inserts

Various PVD and CVD coatings (e.g., JS, SD, HD, JP, TH, CS, PCA, G, JX, GX, ACS, ATH) enhance insert performance by improving heat resistance, lubrication, shock and oxidation resistance, and reducing welding with work materials. Coating thickness ranges from 1μm to 8μm, with hardness and bending strength tailored for specific applications including high-hardness steels, stainless steels, aluminum, titanium alloys, graphite, and fiber-reinforced plastics.

3. Designation and Nomenclature of Milling Inserts

Standardized codes describe insert shape (triangle, square, round, diamond, octagonal, parallelogram, rectangular), clearance angle (0° to 25°), tolerance class, fixing method (hole presence/type), chip breaker presence, edge length, thickness, corner configuration, feed direction, and wiper edge features. This system ensures correct identification and ordering.

4. Insert Specifications and Tolerances

Dimensional tolerances cover thickness, corner height, and inscribed circle diameter with precision classes. Edge treatments include chamfered, rounded, sharp, and combined honing, affecting machining accuracy and insert durability.

5. Product Listings and Stock Status

Extensive tables list item codes, shapes, coatings, tolerance classes, and compatible cutter models (e.g., Alpha Super Excellent Mini, Alpha High Feed Radius Mill). Stock status symbols guide procurement: ● standard stock, ★ new stocked products, △ transitioning to made-to-order after stock depletion or a set date, and no mark for made-to-order only. Coating options include JX, C, JP, JS, SD, HD, TH, and G coatings on carbide bases.

Critical Information and Best Practices

• Match insert grade and coating to workpiece material hardness and machining operation (finishing, general, roughing) for optimal performance.
• Coating selection significantly impacts tool life, cutting speed, and surface finish quality.
• Understanding insert designation codes is essential for accurate ordering and application.
• Adhere to specified dimensional tolerances and edge treatments to ensure machining precision.
• Monitor stock status symbols to plan procurement and avoid delays.

Summary

This document serves as a comprehensive reference for engineers and procurement specialists, detailing Hitachi milling inserts’ materials, coatings, designations, specifications, and stock conditions. It facilitates informed insert selection to enhance machining efficiency and tool longevity.

Additional Notes on Product Classification and Availability

• Stock symbols: ● (standard stock), ★ (new stocked), no mark (made-to-order), △ (stocked until depletion or after Jan 2011 then made-to-order), − (discontinued).
• Insert shapes and item codes follow ISO metric standards with tolerance classes indicating precision levels.
• Applicable cutters include various end mills, face mills, shoulder mills, and radius mills, with page references for detailed cutter info.
• Users should verify stock status before ordering, especially for items marked △ or − to avoid procurement issues.

Summary of Stock Symbols