Application Research of Vibration Stress Relief Technology (Beijing Satellite Manufacturing Plant) (2)

In order to ensure the validity of the test data, all test pieces are made of the same material (same piece of raw material), the same processing equipment, the same tool, and the same cutting parameters. The comparison test was carried out under three conditions of no stress relief, heat treatment stress relief and vibration elimination stress. Three pieces of test pieces were taken in each state, and the test piece was processed into rough machining (3 mm remaining on one side) and semi-finishing. (1mm remaining on one side), finishing and other processes.

a. No stress relief processing test (test piece 1-1)

The processing flow of test piece 1-1 is as follows:

Figure 2 Test piece 1-1 (after roughing)

b. Heat treatment stress relief processing test (test piece 1-2)

The processing flow of the test piece 1-2 is as follows:

The heat treatment uses aluminum alloy aging treatment (no annealing treatment, otherwise the material properties will drop a lot).

Figure 3 Test piece 1-2 (finishing)

c. Vibration stress relief test (test piece 1-3)

The processing flow of test piece 1-3 is as follows:

Figure 4 Test piece 1-3 (finishing)

The effect of stress relief was reflected by measuring the amount of deformation (flatness) of the free-form test piece after processing. The test results are shown in Table 1.

Table 1 Comparison of deformation of small thin-walled structural parts under different conditions

Since the vibration is not relieved in the semi-finishing and finishing, the amount of deformation is increased, and then the test is supplemented. After the semi-finishing, the vibration is relieved, and the deformation after processing is 0.1 to 0.15 mm.

It can be seen from Table 1 that the vibration stress relief effect is significantly better than the heat treatment stress relief.

3.4 High-strength aluminum alloy large-capacity bearing test

The girder parts with large deformation and the widest application are selected as test pieces.

Material: 5A90 (1420 aluminum-lithium alloy, processing performance is equivalent to LD10, is its substitute material);

Status: Forging, CZ;

Structure: thin-walled complex long beam structure, typical wall thickness 5mm, external dimensions 2200mm × 160mm × 120mm, see Figure 5.

Figure 5 High-strength aluminum alloy large-capacity bearing test piece

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