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SAFETY OF CUTTING TOOL PRODUCTS
y 1. Use of Cutting Tool Products
Packages of Mitsubishi products carry a safety warning label. However, tools are not labelled with detailed
warning indications. Please read the "Safety of Cutting Tool Products" in this catalogue before handling cutting
tool products and cemented carbide materials. Moreover, as a part of your workers' safety education, please notify
the contents of the "Safety of Cutting Tool Products" to all workers.
y 2. Basic Characteristics of Hard Tool Materials
a In Terms of "Safety of Cutting Tool Products"
Hard Tool Materials : General term for tool materials such as cemented carbide alloy, cermet, ceramics,
sintered CBN, sintered diamond, high speed steel and alloy steel, etc.
a Physical Characteristics
Appearance : Varies depending on the type of material. Eg. grey, black, gold, etc.
Smell : None
Hardness, Specific Gravity :
Hard Tool Materials Hardness (HV) Specific Gravity Hard Tool Materials Hardness (HV) Specific Gravity
35
High Speed Steel (HSS) 200 1200kg/mm2 79 Sintered CBN 2000 5000kg/mm2 35
79
Cemented Carbide 500 3000kg/mm2 9 16 Sintered Diamond 8000 12000kg/mm2 35
Cermet 500 3000kg/mm2 59 Alloy Steel 200 1200kg/mm2
Ceramics 1000 4000kg/mm2 27 Diamond Electroforming Product 8000 12000kg/mm2
a Constituents
Carbide, nitride, carbon nitride, oxide, W, Ti, Al, Si, Ta, B, V and metals such as Fe, Co, Ni, Cr, Mo.
y 3. Safety of Cutting Tool Products
u Hard tool materials have a large specific gravity. Thus, they require special attention as heavy materials when the size or
quantity is large.
u Cutting tool products generate dust and mist during grinding operations or heating. This dust and mist can be harmful to the
human body when coming in contact with the eyes or skin, or if substantial quantities are swallowed. When grinding and
machining, it is recommended to use local exhaust ventilation and respirators, a dust protective mask, glasses, gloves and so
on. If dust makes contact with the hands, thoroughly wash the affected area with soap and water. Don't eat in the exposed
area, and wash hands thoroughly before eating. Remove dust from the clothing by a cleaner or washing, but don't shake off.
u Cobalt dust can affect the skin, respiratory organs and heart through repeated or prolonged contact.
u For further information, please refer to MSDS (Material Safety Data Sheet).
y 4. Handling Cutting Tool Products
u Surface conditions affect toughness of cutting tools. Therefore, use a diamond grinding wheel for finishing.
u Hard tool materials are extremely hard and brittle at the same time. Thus, they may be broken by shocks and
tightening with excess force.
u Hard tool materials and ferrous materials have different thermal expansion ratios. Shrinkage or swell fit products
may suffer from cracks when applied temperature is higher or lower than the appropriate temperature for the tool.
u Pay special attention on storing hard tool materials. Toughness of hard tool materials is lowered when they
corrode due to coolant and other liquid.
u When brazing hard tool materials, if the temperature is too high or too low from the melting point of the brazing
material, loosening and breakage may occur.
u After regrinding cutting tools, make sure that there are no cracks.
u Machining hard tool materials on EDM may cause cracks on the surface due to remaining electrons resulting in
lowering the toughness. Eliminate cracks by grinding, etc.
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