It takes too long to relieve the pressure through natural placement, which can not meet the needs of modern technology and production;

2. Thermal aging method

Put the workpiece into a thermal aging furnace for heat treatment and slowly relieve the stress.

3, * * * vibration to eliminate stress.

Although this method solves the environmental problem of thermal aging, it is quite complicated to use. For workpieces with different shapes, different aging processes should be compiled. If there are hundreds or thousands of workpieces, hundreds or thousands of processes must be compiled.

Moreover, the operation in production is quite complicated, which requires the operator to determine the processing parameters, and complex workpieces must be operated by skilled professional and technical personnel. What's more, this method can only eliminate the stress of 23% of the workpiece, and it can't achieve the purpose of treating all the workpieces.

4, vibration aging to eliminate stress

Through mechanical assembly, a set of stress relieving equipment is formed, which can relieve the stress of the workpiece in a short time and cover all the workpieces that need to be relieved.

Five frequencies are optimized by spectrum analysis, and the stress of workpiece is eliminated by multi-modal machining method. The equipment can complete all workpieces with different shapes and sizes, and the stress can be eliminated by clamping the vibration exciter on the workpiece to vibrate.

Compared with other methods, such as 15 ton thermal aging furnace, most of the fuel is electricity or natural gas, and the aging cost is more than 3000 yuan once a day. If it takes 300 days a year, electricity or natural gas alone will cost 900 thousand yuan a year. Because the environmental problems in the city are getting more and more serious, the thermal aging furnace is far away from the urban area, and the transportation cost and time cost should be calculated.

Extended data

Stress measuring tools:

A stress gauge or strain gauge is an instrument for measuring the internal stress of an object. Usually, the signals of strain gauges are collected and converted into electrical signals for analysis and measurement.

The method is: stick the strain gauge on the measured object to make it expand and contract with the strain of the measured object, and make the metal foil inside extend or shorten with the strain. The resistance of many metals will change when they are stretched or shortened mechanically.

The strain gauge applies this principle to measure strain by measuring the change of resistance. The sensitive grid of strain gauge is generally made of Cu-Cr alloy, and its resistance change rate is constant, which is proportional to the strain.

Through the Wheatstone bridge, the proportional relationship of this resistance can be converted into voltage. Different instruments can then convert this voltage change into measurable data.

For stress or strain gauges, the key indicators are: test accuracy, sampling speed, number of channels supported by test, dynamic range, supported strain gauge models, etc. Moreover, the supporting software of the stress meter is also very important, which needs to be able to display, analyze and record in real time, and the high-end software should also have various signal processing capabilities.

Baidu Encyclopedia-Relieve Stress