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The close relationship between quenching and crushing load for steel ball

In the manufacturing process, steel balls can be added to the heat treatment process according to different materials. The metallographic structure, hardness and crushing load of the heat-treated steel ball are the key points of the inspection items of the finished steel ball. However, due to the lack of in-depth research on the heat treatment process and the improper operation of the heat treatment process for a long time, the metallographic structure of the steel ball after the heat treatment is not uniform and the crushing load is insufficient.

After long-term discussion and analysis, it is found that the operation of the quenching/tempering process in the heat treatment affects the metallography structure and crushing load of the steel ball. During quenching and tempering, because the heating speed is too fast, greater stress is generated inside the steel ball. Because the internal stress of the steel ball is accumulated and not released, the metallographic structure of the steel ball is not uniform and relatively fragile, thereby reducing the crushing load value of the steel ball.

It is necessary to increase the crushing load value of the steel ball, which must be improved from the quenching process of the heat treatment. In the heat treatment process, the temperature of the front heating zone of each production line is greatly reduced, so as to achieve a balanced heating of the front zone and the back zone, so that the temperature in the quenching rises slowly. The quenching temperature is controlled during the heat treatment of the steel ball, and the metallographic structure of the steel ball is also uniformly changed, so that the internal stress accumulated is small and can be released at the same time during the processing. It can be seen that the steel ball quenching process is closely related to the crushing load of the steel ball.

Crushing load value of finished bearing steel ball

Nominal ball diameter
mm

Crushing load
N

 

Nominal ball diameter
mm

Crushing load
N

 

Nominal ball diameter
mm

Crushing load
N

3 4 800 11 62 720 23.812 5 281 260
3.175 5 390 11.112 5 63 700 24 287 140
3.5 6 570 11.5 68 510 24.606 25 300 700
3.571 88 6 840 11.509 38 68 600 25 309 680
3.968 75 8 430 11.906 25 73 500 25.4 318 500
4 8 530 12 74 480 26 333 200
4.365 62 10 150 12.303 12 78 400 26.193 75 337 940
4.5 10 780 12.5 80 810 26.987 5 357 700
4.762 5 12 050 12.7 83 300 28 385 140
5 13 330 13 87 220 28.575 396 900
5.159 38 14 150 13.493 75 94 080 30 439 040
5.5 15 970 14 100 940 30.162 5 441 000
5.556 25 16 270 14.287 5 104 860 31.75 487 060
5.953 12 18 130 15 115 640 32 494 900
6 19 010 15.081 25 116 620 33 524 070
6.35 21 270 15.875 128 380 33.337 5 534 100
6.5 22 340 15 131 320 34 557 620
6.746 88 24 000 16.668 75 142 100 34.925 582 120
7 25 870 17 147 000 35 588 000
7.143 75 26 950 17.462 5 154 840 36 617 400
7.5 29 690 18 164 640 36.512 5 632 100
7.540 62 29 980 18.256 25 168 560 38 683 040
7.937 5 32 830 19 182 770 38.1 689 000
8 33 320 19.05 183 260 39.687 5 735 820
8.334 38 36 170 19.843 75 198 940 40 745 780
8.5 37 630 20 201 880 41.275 798 700
8.731 25 39 690 20.5 211 830 42.862 5 852 600
9 41 940 20.637 5 214 620 44.45 911 400
9.128 12 43 170 21 221 480 45 931 000
9.5 46 840 21.431 25 229 810 46.037 5 972 340
9.525 47 040 22 241 030 47.625 1 038 800
9.921 88 51 120 22.225 246 960 49.212 5 1 116 620
10 51 940 22.5 252 480 50 1 156 400
10.318 75 54 880 23 262 640 50.8 1 166 200
10.5 56 910 23.018 75 263 070

 

 


Post time: Mar-24-2021