Thermal torsional vibration compound aging method and device for escalator drive spindle
A technology for driving spindles and escalators, which is applied in auxiliary devices, heat treatment furnaces, heat treatment equipment, etc., can solve the problems affecting the runout error of the end face, limited torsional excitation force, and difficulty in controlling the size, so as to eliminate residual stress and improve fatigue performance. Effect
Active Publication Date: 2021-10-12
JIANGSU UNIV
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Problems solved by technology
However, the torsional vibration motor used in this method is expensive, and the torsional vibration force generated is limited, and the size is difficult to control. The welded joint of the escalator drive shaft has a high welding height. The dynamic stress generated by this method can remove its residual stress limited effect
At the same time, the lateral vibration generated by the device may affect the verticality of the sprocket and the main shaft, and affect the runout error of its end face
Method used
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Embodiment
[0078] for diameter The escalator drive spindle with a length of 1000mm and a welding height of a6 is subjected to thermal torsional vibration composite aging treatment. Use the cantilever to install the escalator drive main shaft 12 by the hole on its sprocket and the positioning pin 11 of 4 on the fixed frame. Adjust the mobile frame 15 so that the upper positioning pin 13 can cooperate with the hole on the drive shaft 12 sprocket, and ensure that the tapered positioning column can be in close contact with the escalator drive shaft 12, then lock the mobile frame 15, and strain the 20 pieces are installed near the welding joint near the end of the drive spindle 12 near the torsional vibration device; the eccentric block 9 with a mass moment of 0.02kgm is initially selected, installed on the pulley shaft, and the frequency sweep function is turned on to obtain the torsional natural frequency of the drive spindle 12 as f 0 =52.5Hz, and record the stress value σ of the strain ...
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The invention proposes a thermal torsional vibration composite aging method and device for an escalator drive spindle. This method combines the traditional thermal aging and vibration aging process. By locally heating the weld seam and the vicinity of the weld toe area where the residual stress of the escalator drive spindle welding joint is located, the yield strength at this place will be reduced, and the high stress area is more likely to occur. Yield; at high temperature, the thermal activation energy of material dislocation movement is reduced, and slippage is more likely to occur. At the same time, the present invention uses torsional vibration instead of traditional bending vibration, so that dynamic stress can be more uniformly and effectively applied to the annular welded joint. Under the joint action of these factors, the residual stress elimination effect of vibration aging can be improved, so that the internal stress inside the material can be relaxed and homogenized, and the fatigue performance can be improved.
Description
technical field [0001] The invention belongs to the technical field of welding process post-treatment, and relates to a method for eliminating residual stress by utilizing the compound effect of heat and torsional vibration, which is used for reducing and homogenizing the residual stress of welded joints. The invention particularly relates to a thermal torsional vibration composite aging method and device for an escalator drive spindle. Background technique [0002] The escalator is an indispensable means of transportation in public places such as stations, shopping malls, and subways. It not only greatly relieves the pressure of busy traffic, but also brings great convenience to the society. However, with the increasing number of escalators, dangerous accidents on escalators have been on the rise in recent years. According to statistics, 30% of escalator safety accidents are caused by wear, deformation, failure or even fracture of parts or components in the escalator drive...
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IPC IPC(8): C21D9/50C21D10/00B23K37/00
CPCB23K37/00C21D9/50C21D10/00
Inventor 姜银方孙有为刘新
Owner JIANGSU UNIV