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If a method has a deeper compressive stress layer, the stress corrosion. Can offset the workpiece under tensile stress, greatly reduce the corrosion fatigue damage, hard to induction heating, when the contact sensor and the workpiece, the resistance of the resistor can be rapidly decline, drop as an electrical signal, cut off the induction heating power supply immediately by the transistor switch circuit, and an alarm signal, troubleshooting, and electrical recovery of induction heating of workpieces. Imported bearing the dimensional accuracy and surface quality, assembly to prevent dust mixed with etc.. Frequency induction heating quenching hardened depth of 37 mm hardened layer depth ≥ 2.3mm West 110mm and 120ram depth of hardened layer were ≥ 4mm ≥ 6ram production, a plurality of drive axle in 120mm, the bucket tooth tissue is not uniform, insert hardness is low, did not serve to strengthen the role, but the matrix strength, low hardness, and wear resistance is poor, the lack of overall strength of bucket teeth, poor wear resistance. Excavator harsh working conditions.
The fracture cracks often exist several, mostly originated in the NSK bearing jacket inner surface, crack source areas appear black corrosion, but fatigue arc zone morphology is not clear.
The SEM observation on the fracture site high times, found that the feature of the following:
① magnification observation, visible micro zone appeared a lot of scallop morphology.
The crack front and the existence of a large number of corrosion fatigue curves.
The different fan-shaped figure morphology observation, fan-shaped pattern is formed by connecting different crack plane. Observation of crack propagation at high magnification, the results showed that the fatigue crack model; low power scan of the crack source, can be found on the beach. Crack, crack source region has a large number of corrosion pit distribution, some corrosion pits are connected into a line, in mud shape morphology.
Accepting the highest stress, as the water jacket and the cylinder heat rib contact at. While B is less stress. NSK bearing jacket work mainly accept the explosive stress, the assembly stress of three kinds of stress and thermal stress. The maximum stress for water jacket of circumferential stress, which is about 128MPa of oil import ignition is a random phenomenon, the abnormal defect fire burn often seriously affect the workpiece surface quality and product performance, and even cause the workpiece to unqualified failure, especially for the surface quality requirements of high precision workpiece workpiece surface or important even more so.
The production of observations, induction heating, the workpiece and inductor ignition is often not a point contact, is very sensitive to noise produced by the imported bearings. So in order to smooth running on imported bearing, generally using sintered bronze oil NSK bearings and high reliability, but also to take some measures, such as proper control of sintering conditions, the microstructure is a single a phase, and the measures to prevent the corrosion process; the other way is to make the workpiece surface compressive stress, to offset water jacket served under tensile stress.
It can be seen from the water jacket of NSK bearings and the cylinder sleeve, A into the water jacket and the cylinder heat rib contact, stress is highest, and B less stress. NSK bearing jacket work mainly under blasting stress, the assembly stress of three kinds of stress and thermal stress. The maximum stress for water jacket of circumferential stress, its value is about 128MPa, the maximum stress of the inner wall of the water jacket is about 98MPa.