Large-scale locomotive connecting rod forging technology
A technology of connecting rods and locomotives, which is applied in the field of forging technology, can solve the problems of reduced mechanical properties of connecting rods, low mechanical properties of connecting rods, and high labor intensity of workers, and achieve the goals of reducing procedures, good billet making effect, saving time and cost Effect
A technology of connecting rods and locomotives, which is applied in the field of forging technology, can solve the problems of reduced mechanical properties of connecting rods, low mechanical properties of connecting rods, and high labor intensity of workers, and achieve the goals of reducing procedures, good billet making effect, saving time and cost Effect
CN104057263AActive Publication Date: 2014-09-24SICHUAN HAOTE JINGGONG EQUIP CO LTD
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Embodiment
[0048] Based on the above-mentioned technological process, the present embodiment takes the production of a 75kg locomotive connecting rod as an example.
[0049] a. For blanking, choose 42CrMoA round steel with a diameter of 185mm, and cut it with a length of 510±1mm;
[0050] b. Billet turning process, unilaterally turning 1mm on the outer surface of the round steel to remove the decarburization layer and defects generated on the surface during the rolling production just now;
[0051] c. Coating high temperature and oxidation resistant anti-decarburization coating on the surface of the processed blank. Use temperature 800~1400℃, coating thickness 0.5-1mm;
[0052] d. Put the blank coated with anti-decarburization coating into a natural gas furnace and heat it to 1200±10°C, and keep it warm for 2.5-3h;
[0053] e. After the billet heat preservation is completed, the surface oxide layer is removed by a descaling machine;
[0054] f. Carry out roll forging on the billet to ...
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Abstract
The invention discloses a large-scale locomotive connecting rod forging technology which comprises the steps of blanking, lathing, anti-decarburization coating application, blank heating, surface oxidation layer removal, roll forging of blanks, pre-forging, finish forging, trimming, punching and calibration, anti-decarburization coating application and heat treatment. According to the large-scale locomotive connecting rod forging technology, forming can be achieved through one time of heating only. Compared with the traditional technology that heating needs to be conducted twice or more, the technology has the advantages that surface oxidation and decarburization of a connecting rod are effectively reduced, the mechanical performance of the connecting rod is guaranteed, and time and energy resources are saved. Due to the adoption of roll forging of blanks, speed is high, labor is saved, the consistency of manufactured blanks is high, and time and labor are saved during forging in later periods. Due to the fact that high-temperature-resistant and oxidation-resistant anti-decarburization coating application is conducted twice during the whole technology, the decarburized layer on the surface of a final forged piece is thinner than 0.3 mm, and product quality is improved effectively. Due to the fact that the connecting rod forged piece is vertically hoisted for heat treatment, bending deformation of the forged piece is effectively prevented during heat treatment.
Description
technical field [0001] The invention relates to a forging process, in particular to a large-scale locomotive connecting rod forging process, and belongs to the technical field of forging process. Background technique [0002] At present, the forging process of domestic large-scale locomotive connecting rods mainly includes: blanking, heating, free forging billet, grinding defects, heating, pre-forging, final forging, edge trimming / punching, correction, heat treatment. [0003] The disadvantages of the above process are obvious: [0004] (1) At least two or more times of heating are required before final forging. Multiple heatings will cause: oxidation and decarburization of the connecting rod surface, the depth of the decarburization layer reaches 1.0-1.5mm, and the mechanical properties of the connecting rod are reduced; [0005] (2) There is no special treatment for heat treatment in the traditional process, and the bending degree of the connecting rod after heat treatmen...
Claims
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Patent Timeline
24 Sep 2014
Publication
CN104057263A
- IPC
- B23P15/00; B21J5/00
- CPC
- B21D37/10; B21J5/002; B21K7/12; C21D9/0075
- Inventors
- 辜俊杰; 辜子恒