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1、 Seven types of impact devices for hardness testers - Technical parameters:
List of Technical Parameters for Impact Devices:
| Irregular impact device | DC（D）/DL | D+15 | C | G | E (to be imported) | |||||
| Impact energy impacts the mass of the body | 11mJ 5.5g/7.2g | 11mJ 7.8g | 2.7mJ 3.0g | 90mJ 20.0g | 11mJ 5.5g | |||||
| Ball hardness: Ball diameter: Ball material: | 1600HV 3mm tungsten carbide | 1600HV 3mm tungsten carbide | 1600HV 3mm tungsten carbide | 1600HV 5mm tungsten carbide | 5000HV 3mm diamond | |||||
| Diameter of impact device: Length of impact device: Weight of impact device: | 20mm 86(147)/ 75mm 50g | 20mm 162mm 80g | 20mm 141mm 75g | 30mm 254mm 250g | 20mm 155mm 80g | |||||
| Test piece * high hardness | 940HV | 940HV | 1000HV | 650HB | 1200HV | |||||
| The average surface roughness Ra of the specimen: | 1.6μm | 1.6μm | 0.4μm | 6.3μm | 1.6μm | |||||
| Test piece * small weight: can be directly measured requires stable support and dense coupling | >5kg 2～5kg 0.05～2kg | >5kg 2～5kg 0.05～2kg | >1.5kg 0.5～1.5kg 0.02～0.5kg | >15kg 5～15kg 0.5～5kg | >5kg 2～5kg 0.05～2kg | |||||
| Test piece * small thickness dense coupled hardening layer * small depth | 5mm ≥0.8mm | 5mm ≥0.8mm | 1mm ≥0.2mm | 10mm ≥1.2mm | 5mm ≥0.8mm | |||||
| Ball indentation size | ||||||||||
| When the hardness is 300HV | Indentation diameter, indentation depth | 0.54mm 24μm | 0.54mm 24μm | 0.38mm 12μm | 1.03mm 53μm | 0.54mm 24μm | ||||
| When the hardness is 600HV | Indentation diameter, indentation depth | 0.54mm 17μm | 0.54mm 17μm | 0.32mm 8μm | 0.90mm 41μm | 0.54mm 17μm | ||||
| When the hardness is 800HV | Indentation diameter, indentation depth | 0.35mm 10μm | 0.35mm 10μm | 0.35mm 7μm | -- -- | 0.35mm 10μm | ||||
| Scope of application of impact device | DC type measuring hole or cylinder; DL type measurement of slender narrow slots or holes | D+15 type measuring groove or concave surface | C-type measurement of small lightweight components and surface hardening layers. | G-type measurement of heavy and rough surface castings and forgings | E-type material with extremely high hardness measurement | |||||
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