Tensile testing machine series
tensile testing machine
Cupping universal
electro-hydraulic servo
Electronic universal tensile testing machine series
Liquid crystal display
Microcomputer control
Hydraulic universal testing machine series
Microcomputer controlled
Microcomputer screen display type
Digital display type
WE-B type cylinder type
Type WEW-D six column
WAW-C worm electro-hydraulic servo
Impact testing machine series
Pendulum type impact
The impact specimen notch broaching
Impact specimen low temperature tank
Impact specimen notch projector
pendulum type impact
Torsion testing machine series
Material machine
Wire torsion testing machine
NDS series digital display
metal wire
wire winding tester
NDW series microcomputer control material
Spring testing machine series
Manual double digital display
Full automatic
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Spring torsion
Spring fatigue
Gas
Pressure testing machine series
Digital pressure
Automatic pressure
Manhole cover pressure
microcomputer control constant
electro hydraulic
liquid crystal display type
Steel strand testing machine
Computer screen display
Computer controlled
vertical (horizontal) steel strand relaxation
electro hydraulic servo
screen display steel strand
Ring steel test machine
Microcomputer control
Liquid crystal display
liquid crystal display
microcomputer control
artificial board
Artificial board universal
manual artificial board
artificial board scratch
rolling wear
artificial board universal
falling ball impact
Test machine parts
Electronic extensometer
DX-400 manual management
Test machine parts -1
Test machine parts -2
Test machine parts -3
Bending test machine
reinforcing steel bar
Steel tube
Wire
pipe bending
reinforced bar
double reinforced
Hardness tester series
HR-150A's
HB-3000B's
HV-1000 micro
FY310 portable
LX-A portable shore
HLN-11A
Metallographic examination equipment
Metallurgical microscope
Metallographic polishing
Metallographic mosaic
Metallographic cutting

常用维氏和洛氏硬度计区别


  维氏硬度计和洛氏硬度计相比数据精确。
  (1)维氏硬度(HV)
  以120kg以内的载荷和顶角为136°的金刚石方形锥压入器压入材料表面,用材料压痕凹坑的表面积除以载荷值,即为维氏硬度值(HV),相对来说维氏硬度计是适用于材料偏软或材料很薄的金属材料。
  (2)洛氏硬度(HR)
  用有一定顶角(例如120°)的金刚石圆锥体压头或一定直径D的淬硬钢球,在一定负荷P作用下压入试件表面,保持一段时间后卸去载荷,在试件表面将会留下某个深度的压痕。由洛氏硬度机自动测量压坑深度并以硬度值读数显示(显然,压坑越深,硬度越低,表示的洛氏硬度值越小)。根据压头与负荷的不同,洛氏硬度还分为HRA、HRB、HRC三种,其中以HRC为最常用。 因洛氏硬度计的试验力值很大,该硬度计适用于材质较硬的黑色金属、有色金属的洛氏硬度测定。洛氏硬度HRC与布氏硬度HB之间有如下换算关系:HRC≈0.1HB。

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