Defects and Countermeasures for Large-scale Forgings
Defects that often occur when forging large push pieces are mainly caused by improper technical measures, die design and material selection, such as misalignment between billet and die, die forging defect, die forging process defect, forging material defects, etc. To ensure the quality of large-scale forge pieces in production, we need to deal with the following problems in a targeted manner.
1. First of all, it is necessary to properly adjust the die forging system parameters, such as groove shape matching of holes, pressing machine pressure, speed, and dwell time. In addition, it is also necessary to select and adjust the adequate performance of the die material and other accessories, and to ensure the accuracy of various dimensions in the die design, such as hole size, round corner radius, feed gap size and other dimensional accuracy. To make the shape more uniform and to reduce the errors in the part size and shape, it is necessary to select the appropriate billet position before forging, to make the billet match the forming surface of the die, and to reduce the misalignment caused by the billet and die.
2. Secondly, we must pay attention to the selection of forging material, starting from the basic performance parameters and chemical composition performance of forging material. We also need to pay attention to the processing performance of forging materials , such as hot and cold-deforming performance, surface hardness and response performance during hot working, etc.
3.Thirdly, it is necessary to take appropriate heat treatment to improve the mechanical properties. Generally, after forging, it is necessary to carry out self-tempering process to eliminate the residual stress generated during forging and welding, reduce the hardness of forging pieces, and improve the comprehensive comprehensive performance. At the same time, it is also necessary to carry out carbide refinement and grain refinement treatment by accurate heat treatment, so as to improve the properties of parts, such as hardness, strength, toughness and fatigue resistance.
4.Fourthly, it is necessary to strengthen the inspection of equipment and processes. This requires equipment and process inspection personnel to be professionally trained and equipped with operating experience to ensure the success of process inspection. Moreover, the operators should receive formulation and strict process control to ensure the correctness of the process.
5.Finally, the quality of die design and manufacture must be strictly checked. It is necessary to strictly control the processing accuracy of die and regularly update various precision measuring instruments and professional measuring software, so as to ensure the quality consistency. It is also necessary to ensure that the die service life meets the requirements of the parts, and to do routine maintenance and die maintenance work.
In conclusion, precision forging for large-scale forgings is important for obtaining the required quality. Using the above countermeasures can effectively improve the forging quality and reduce the production cost, which is conducive to optimizing the total production chain.
