Upsetting method of bearing steel cake blank
A technology of bearing steel and cake billet, which is applied in the direction of metal processing equipment, etc., can solve the problems of uneven deformation of cake billet, uneven structure and performance of cake billet, affecting product structure and performance, etc., and achieve the effect of improving forging performance and uniform deformation
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[0030] The main chemical element content (weight percentage) of the steel is: C content 0.17% ~ 0.23%, Mn content 0.30% ~ 0.60%, Si content 0.15% ~ 0.40%, S content ≤ 0.030%, P content ≤0.030%, the content of Cr is 1.25%-1.75%, the content of Ni is 3.25%-3.75%, the content of Cu is ≤0.25, and the balance is Fe.
[0031] The steps of this method are as follows:
[0032] Step 1: General upsetting.
[0033] Heat the bearing steel bar with diameter D and height H to the forging temperature in the forging furnace, and keep it warm for a period of time; put the bar on the lower cutting board of the forging press, in order to ensure that the middle area of the bearing steel cake billet after upsetting The amount of deformation can reach 36% to 42%, and the bar is upset to a height of H 0 =(0.60~0.64)H, to obtain the middle cake base 1, such as figure 2 shown.
[0034] Step 2: Local upsetting of the upper end surface.
[0035] As shown in the figure, the special tooling 2 is p...
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