Carbide Tool Product Safety Pamphlet / Cutting Tool Edition
Sumitomo Electric Hardmetal pursues product manufacturing with a focus on both quality and safety. Take note of each of the following points when using IGETALLOY, SUMIBORON or SUMIDIA products for safe use.
1. Carbide Tool Product Usage
Be sure to read this pamphlet thoroughly before handling or using any kind of carbide tool product or carbide tool material. Furthermore, as part of your employee safety training, make sure that all staff are well aware of the contents of this pamphlet.
2. Basic Characteristics of Carbide Tool Materials 2-1. Understanding the Terminology in this Pamphlet
Carbide Tool Material: Overall name for tool materials such as cemented carbide, cermet, ceramics, CBN, and polycrystalline diamond. Cemented Carbide: Tool material using WC (tungsten carbide) as the main constituent Carbide: Nickname for carbide tool materials. In a narrow sense, it is used as an abbreviation of cemented carbide. Carbide Tool: Overall name for tools that use carbide tool materials
2-2. Physical Characteristics
Appearance: Depends on the material. Ex: Gray, black, gold, etc. Smell: Odourless Hardness: Carbide / cermet Hv5 to 30GPa, ceramics Hv10 to 40GPa CBN Hv20 to 50GPa, polycrystalline diamond Hv80 to 120GPa Specific Gravity: Carbide 9 to 16, cermet 5 to 9, ceramics 2 to 7, CBN and polycrystalline diamond 3 to 5
2-3. Constituents
Carbides, nitrides, carbon nitrides and oxides of W, Ti, Al, Si, Ta, and B, in addition to alloys containing Co, Ni, Cr, Mo and other constituents.
3. Precautionary Notes for Handling Carbide Tool Materials
· While carbide materials are extremely hard, they also possess characteristics of brittle materials. Accordingly, they may break if subjected to shock or if excessive tightening force is applied. · Carbide materials have a high specific gravity: if the product is large or there are many items, they should be handled carefully as heavy items. · Carbide materials have a different rate of thermal expansion from metal materials. Therefore, if the operating temperature is much higher (or lower) than the designed value, hot-fit/cool-fit (shrink fit) tools may crack. · Carbide materials may corrode in liquids such as grinding fluid or lubricant, decreasing the strength of the tool. Consequently, store them with care.
4. Precautionary Notes on the Use of Carbide Tools
· The strength of carbide tools can be drastically reduced if the surface shape is changed. Always use a diamond grindstone for finishing. · Carbide tools generate cutting dust when cutting. There may be harmful physical effects if a large amount is inhaled. Install a ventilation device and wear a protective mask and gloves when using the tool. If the dust gets on the skin or in the eyes, immediately wash out and rinse with water. · If discarding lubricant used when grinding carbide materials or brazed products, the liquid will contain heavy metal constituents and should be discarded appropriately. · When regrinding a carbide tool, check that no cracks have formed after regrinding is complete. · Cracks may form if attempting to mark carbide materials and products with a laser or electric pen. Make sure areas where stress is applied are not marked. · Residual cracks will form on the surface if electrical discharge machining carbide materials, decreasing the strength. If EDM is required, completely grind away these cracks. · If brazing carbide materials, take care as if the temperature of the brazing material is too hot or too cold the carbide may come loose or become damaged.
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