A high-precision sprocket cold extrusion process
A cold extrusion, high-precision technology, applied in the direction of metal extrusion, metal material coating process, metal extrusion control equipment, etc., can solve the problem of low accuracy of sprocket tooth profile, short service life of sprocket, and simplification of varieties And other problems, to achieve the effect of stable product quality, high tooth shape precision, and strict ratio
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Embodiment 1
[0022] S1, by weight percentage, weigh the raw materials C 1.2%, Si 0.8%, Mn 0.3%, Ni 0.6%, Al 0.32%, Cr 0.28%, Mg 0.12%, P 0.12%, S 0.05%, Bi 0.04% , RE 0.005%, the balance is Fe, spare;
[0023] S2. The raw materials in step S1 are evenly put into the vacuum induction furnace for smelting, the smelting pressure is set to 22 MPa, the stirring rate is 450 r / min, and the temperature is raised at a heating rate of 4 °C / s until all the raw materials are melted and then stirred for 1 h. get alloy liquid;
[0024] S3. Referring to the working diagram of the part, pour the alloy liquid in step S2 into the mold preheated to 320 °C. After the pouring is completed, the temperature is lowered to 400 °C for the first time at a cooling rate of 2.2 °C / s, and the heat preservation treatment is performed for 16 hours. The blank is obtained by cooling down to room temperature for the second time at a cooling rate of 5.5°C / s;
[0025] S4. Perform shot blasting for 18 minutes on the blanks ob...
Embodiment 2
[0027] A high-precision sprocket cold extrusion process proposed by the present invention includes the following steps:
[0028] S1, by weight percentage, weigh the raw materials C 1.6%, Si 1%, Mn 0.35%, Ni 0.7%, Al 0.35%, Cr 0.3%, Mg 0.14%, P 0.2%, S 0.08%, Bi 0.05% , RE 0.01%, the balance is Fe, spare;
[0029] S2. The raw materials in step S1 are evenly put into the vacuum induction furnace for smelting, the smelting pressure is set to 25 MPa, the stirring rate is 500 r / min, and the temperature is raised at a heating rate of 5°C / s until all the raw materials are melted and then stirred for 1.2 hours. , get alloy liquid;
[0030] S3. Referring to the working diagram of the part, pour the alloy liquid in step S2 into the mold preheated to 340°C. After the pouring is completed, the temperature is lowered to 405°C for the first time at a cooling rate of 2.4°C / s, and the heat preservation treatment is performed for 17h, and then The blank is obtained by cooling down to room te...
Embodiment 3
[0033] A high-precision sprocket cold extrusion process proposed by the present invention includes the following steps:
[0034] S1, by weight percentage, weigh the raw materials C 2%, Si 1.3%, Mn 0.4%, Ni 0.8%, Al 0.4%, Cr 0.35%, Mg 0.15%, P 0.3%, S 0.1%, Bi 0.06% , RE 0.015%, the balance is Fe, spare;
[0035] S2. The raw materials in step S1 are evenly put into the vacuum induction furnace for melting, the melting pressure is set to 30 MPa, the stirring rate is 550 r / min, and the temperature is raised at a heating rate of 6 °C / s until all the raw materials are melted and then kept stirring for 1.5 h. , get alloy liquid;
[0036] S3. Referring to the working diagram of the part, pour the alloy liquid in step S2 into the mold preheated to 350°C. After the pouring is completed, the temperature is lowered to 410°C for the first time at a cooling rate of 2.5°C / s, and the heat preservation treatment is performed for 18h, and then The blank is obtained by cooling down to room te...
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