Analyze the cracking failure of the bearing block

Source: China Bearing Network Time: 2018-01-11

/*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';

If it is a certain method, a deep compressive stress layer is formed; regarding the corrosion stress, the tensile stress of the workpiece can be offset; the corrosion fatigue damage is greatly reduced; the induction heating is tried as much as possible; when the sensor and the workpiece are touched; Reduced; can now take the resistance dip as an electrical signal; immediately pass the transistor switching circuit to intercept the induction heating power supply; together to announce the alarm signal; after the fault is swept; then send the electric resonance workpiece induction heating. The dimensional accuracy and surface quality of the bearing; try to avoid when assembling Dust ingress. Frequency induction heating quench hardening layer depth of 3 7 mm rmm hardened layer depth â‰¥ 2 . 3mm West 110mm and 120ram hardened layer depth is â‰¥ 4mm â‰¥ 6ram found in production; several drive axle half shafts are 120mm; uneven teeth arrangement; insert hardness is low; no strengthening effect; Low strength and hardness; and poor wear resistance; lack of strength of the whole tooth; poor wear resistance. Under the harsh working conditions of the excavator.
There are many sources of fracture cracks; most of them originate from the inner surface of the inlet bearing water jacket; the crack source area presents black corrosives; but the fatigue arc traces are not clearly defined.
Scanning electron microscopy survey of the fracture site; the characteristics are as follows:
1 Expand the multiple survey; visible micro-regions show many fan-shaped tricks.
2 There is a fatigue arc at the front end of the crack and there are many corrosion pits.
3 Different views of the fan-shaped tricks are different; the fan-shaped tricks are composed of different plane cracks. The crack extension area is investigated at high magnification; the typical fatigue crack is found, and the crack source is low-scan; the beach trick can be found around the crack. Source; crack source area has many corrosion pits scattered; some corrosion pits are connected into a line;
4 The highest stress is accepted; the water jacket and the hot sleeve of the cylinder sleeve are touched. The stress at B is small. The three stress effects of the explosion stress, the installation stress and the thermal stress are accepted in the operation of the inlet bearing water jacket. The maximum stress of the water jacket It is a hoop stress; its value is about 128 MPa. It is a random anomaly in the oil-containing inlet. The abnormal defects of the workpiece appearing on the fire often seriously affect the surface quality and product function of the workpiece; even the formation of the workpiece is unqualified and invalid; This is especially true for fine or critical workpiece surfaces with high surface quality requirements.
5 observations during production; induction heating; the ignition of workpieces and sensors is often not a touch; the noise of the bearing is very sensitive. Therefore, in order to adhere to the oil-slip work of the bearing; usually the high-quality sintered bronze oil-bearing imported bearings are used; And some methods should be adopted; for example, proper control of the sintering conditions; the arrangement of the alloy is a single phase a; the anti-corrosion process can be selected, and the other method is to make the surface of the workpiece with compressive stress; to offset the acceptance of the water jacket in the service. Pulling stress.
It can be seen that the cooperation between the inlet bearing water jacket and the cylinder liner; A is the water jacket and the cylinder sleeve hot rib touch; the receiving stress is the highest; and the stress at the B is small. The inlet bearing water jacket operation mainly accepts the blasting stress, The three stress effects of installation stress and thermal stress. The maximum stress of the water jacket is hoop stress; its value is about 128 MPa; the maximum stress of the inner wall of the water jacket is about 98 MPa.

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