Kunshan Meiyaxing Hardware Machinery Co., Ltd. is a direct branch of Hong Kong Meiya International Trading Co., Ltd. in China. It owns its own cutting tool brand: MANF, and engages in the sales and operation of CNC cutting tools. It provides tungsten carbide end mills, milling inserts, turning inserts, grooving and parting inserts, drilling and boring inserts, multi-functional inserts, threading inserts, and other indexable inserts and their matching tool holders and tool holders. Furthermore, it has established long-term strategic partnerships with several well-known manufacturers, jointly developing R&D, design, and production teams, utilizing advanced equipment and continuously innovating technological capabilities. Committed to mutual cooperation and technical service-oriented approaches, it forms a mutually supportive industrial chain to solve problems for processing and manufacturing enterprises. Various Machining Issues.
A Comprehensive Guide to Selecting and Advantages of Stainless Steel Interrupted Machining Inserts
Stainless steel (such as 304, 316, 17-4PH, etc.) is widely used due to its excellent corrosion resistance and strength, but its machinability, especially under interrupted cutting conditions, makes it a difficult material to machine. Interrupted machining (such as milling grooves, cavities, cross holes, casting surfaces, etc.) generates severe mechanical shock and thermal cycling on the inserts, easily leading to chipping, spalling, and rapid wear. Therefore, insert selection is crucial.
Part 1: How to Choose Stainless Steel Interrupted Machining Inserts?
Selecting inserts requires a systematic consideration of four core dimensions: substrate material, coating technology, groove geometry, and edge treatment.
1. **Instrument Matrix Material:** Toughness is Paramount
* **Core Requirements:** Extremely high toughness and impact resistance are essential to withstand the stresses generated by interrupted cutting. Good resistance to thermal fatigue and adhesion to coatings are also crucial.
* **Selection Recommendations:**
* **Prioritize ultrafine/submicrocrystalline cemented carbide matrices.** These matrices achieve the optimal balance between hardness and toughness, effectively inhibiting crack propagation.
* **Choose tough grades with high binder phase content, rather than those prioritizing extreme hardness.** For example, "M" type (general-purpose stainless steel) or "S" type (heat-resistant alloy steel) materials designed specifically for stainless steel and interrupted machining typically undergo special toughening treatments.
* **Avoid using materials that are high in hardness and wear resistance but brittle, designed purely for continuous finishing.**
2. **Coating Technology:** Strong Protection and Lubrication
* **Core Requirements:** The coating must provide excellent adhesion strength, wear resistance, and a certain degree of lubrication to resist stainless steel adhesion (edge buildup) and work hardening.
* **Selection Recommendations:**
* Physical coatings are preferred: TiAlN-based coatings (such as AlTiN, TiAlCrN) are the mainstream. They form a dense alumina layer at high temperatures, exhibiting high hardness and good thermal stability, making them ideal for handling the heat generated during stainless steel machining.
· Composite coatings are a high-end option: These employ multi-layer/nanostructured coatings, such as multi-layer TiAlN/TiN or AlCrN-based coatings (such as AlCrSiN). These coatings effectively prevent crack propagation within the coating, exhibiting extremely strong resistance to chipping, while also possessing high hardness and a low coefficient of friction.
· Consider lubricating coatings: For highly viscous austenitic stainless steels (such as 304), coatings with a lubricating phase (such as MoS2) or post-treatment to smooth the surface can be selected to reduce built-up edge formation.
3. Geometric Groove Design: The Core Art of Mechanical Engineering
· Core Requirements: Geometric grooves are the first line of defense against intermittent impacts and must be optimized to reduce cutting forces, disperse impact stress, and stabilize chip removal.
· Selection Recommendations:
· Strengthening the cutting edge: Employing large chamfers, blunting the cutting edge, or using a small negative rake angle. This significantly enhances the cutting edge strength, prevents chipping, and is the most obvious difference between interrupted and continuous machining inserts.
• Positive rake angle combined with a robust chip breaker: While edge strength is necessary, a positive rake angle chip breaker is typically used to reduce the high cutting forces in stainless steel machining. Crucially, this positive rake angle chip breaker is "reinforced"-it features a robust shoulder, a smooth chip breaker, and a reinforced clearance structure, ensuring both sharpness and impact resistance.
• Number of cutting edges: Where stability allows, prioritize fewer effective cutting edges (e.g., double-sided 2-flute square inserts). This usually means a larger chip space and a stronger insert body, offering better impact resistance than multi-flute, close-tooth inserts.
4. Edge treatment and other considerations
• Edge pretreatment: In addition to chamfering, high-quality edge polishing reduces friction and built-up edge adhesion, which is especially important for stainless steel machining.
• Cutting Parameter Strategy: After selecting specialized inserts, it's crucial to use the correct parameters-appropriately reduce the linear velocity (Vc) to control heat, maintain a large feed per tooth (fz) to form thick chips, avoid "scraping" on the hardened layer, and employ a small depth of cut (ap) and full width at cut (ae) milling method for smoother entry.
Tool Holder/Cutter Head System: Select the tool holder with the highest rigidity (such as a hydraulic or heat-shrink tool holder) and the shortest possible overhang to maximize system rigidity.
If you have any questions about MANF CNC tools, please call us for consultation or inspection"
Contact us:Company name:Kunshan Meiyaxing Hardware Machinery Co., Ltd;Tel:8618962438699;Address: Room 3003, Building 3, Zhengtailong, No. 1288 Chengbei Middle Road, Kunshan City, Jiangsu Province, China;Email:myxcuttingtools@gmail.com;Website: https://www.myxcuttingtools.com
