BRANCH:涉及领域 Foundries, hardening shops, combustion engine construction
TASK:任务 Hardness testing on the running surfaces of camshafts
In order to attain adequate service lives, that means high capacity of resistance to wear, camshaft running faces are hardened, for example in the laser beam remelting process.
It must be ensured in this process that the martensitic micro-structure is developed uniformly over the camshaft contour by exact thermal processes and time sequences.
This process is checked by means of hardness testing. This calls for a method that keeps the necessary time expenditure within certain limits even with statistically required multiple measurements.
We recommend the hardness test according to the UCI method.
Using the test load of 0.3 kgf (3 N) and 1 kgf (10 N) respectively, an approximative nondestructive surface hardness determination is achieved (experience shows that the indentation depths of Vickers diamonds are at around 4 to 7 μm).
通过分别施加0.3 kgf (3 N) 和1 kgf (10 N)载荷来获得近似的且表面没有损坏的硬度值（经验得出维氏金刚石的压痕深度大约在4-7 μm之间）
The measuring process is considerably simplified by the special test support MIC 225 for hardness testing on camshafts.
This is achieved by mounting the camshaft in vee-blocks and an air bearing slide carriage with probe support guiding the measuring device parallel to the shaft axis. The torsion of the shaft during the measuring process is prevented by a magnetic locking.
This ensures an exact positioning of the probe on the camshaft base circle or camshaft tip.
Hardness tester: MIC 10, MIC 10 DL
Probes: MIC 2003-A (motor probe)
MIC 201-A (hand-held probe)
Accessories: MIC 225 (camshaft test support)