Safety of Cutting Tool Products Hard tool materials have a large specific gravity Thus they require special attention as heavy materials when the s

Safety of Cutting Tool Products Hard tool materials have a large specific gravity Thus they require special attention as heavy materials when the s

Safety of Cutting Tool Products Hard tool materials have a large specific gravity. Thus they require special attention as heavy materials when the size or quantity is large. Cutting tool products generate dust and mist during grinding operations or heating. This dust and mist can be harmful 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 etc. 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 cleaning or washing but don't shake off. OCobalt and nickel contained in carbide or other cutting tool materials are reported as possibly carcinogenic to humans. It is also reported that cobalt and nickel dust and mist can affect the skin respiratory organs and heart through repeated or prolonged contact. OFor further information please refer to MSDS (Material Safety Data Sheet). MSDSMaterial Safety Data Sheet Home page http Mitsubishi msds 4. Handling Cutting Tool Products OSurface conditions affect toughness of cutting tools. Therefore use a diamond grinding wheel for finishing. OHard tool materials are extremely hard and brittle at the same time. Thus they may be broken by shocks and tightening with excess force. OHard 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. OPay special attention on storing hard tool materials. Toughness of hard tool materials is lowered when they corrode due to coolant and other liquid. OWhen 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. OAfter regrinding cutting tools make sure that there are no cracks. OMachining hard tool materials on EDM may cause cracks on the surface due to electrons remaining after the EDM operation resulting in lowering of the toughness. Eliminate these cracks by grinding etc. 18 SAFETY OF CUTTING TOOL PRODUCTS 1. Use of Cutting Tool Products Packages of Mitsubishi products carry a safety warning label. However tools are not labeled 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. 2. Basic Characteristics of Hard Tool Materials In Terms of "Safety of Cutting Tool Products" Hard Tool Materials General term for tool materials like cemented carbide alloy cermet ceramics sintered CBN sintered diamond high speed steel and alloy steel etc. 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 High Speed Steel (HSS) 200 1200kg mm2 7-9 Sintered CBN 2000 5000kg mm2 3-5 Cemented Carbide 500 3000kg mm2 9-16 Sintered Diamond 8000 12000kg mm2 3-5 Cermet 500 3000kg mm2 5-9 Alloy Steel 200 1200kg mm2 7-9 Ceramics 1000 4000kg mm2 2-7 Diamond Electroforming Product 8000 12000kg mm2 3-5 Constituents Carbide nitride carbon nitride oxide such as W Ti Al Si Ta B V and metals such as Fe Co Ni Cr Mo. 3.