According to the technical requirements of the disc spring, and taking into account the deformation characteristics of the material in the process of formulating each process, through a large number of targeted process tests on the processes of blanking, processing, press forming, heat treatment, grinding and polishing, and shaping treatment, master The process parameters and deformation laws have made the product quality meet the design requirements. Technical parameters: disc spring outer diameter φ128033.0mm, inner diameter φ214.227.00+mm, inner and outer diameter coaxiality is φ0.06mm, bearing surface width is 0.2mm, bearing surface parallelism is 0.04mm, thickness is 0.8mm, height is 1.6+0.03 Mm. When the deformation of the spring is 0.125h, F1=152525+N; when the deformation of the spring is 0.25h, F2=2602613+N; when the deformation of the spring is 0.7h, F3=56010030+N; when the spring When the deformation is 0.75h, Ff=58111040+N. Where h is the amount of spring deformation. In order to ensure the coaxiality of the finished parts, the coaxiality tolerance of the inner and outer diameters of the flat round blank before the pressing shall not exceed 50% of the forming precision, ie 0.03, and the high-precision semi-finished parts shall be obtained by machining; the workpiece shall be processed by 60t punching machine. The raw material is punched into a φ30 wafer with a flatness of less than 0.05mm; about 15 pieces of the workpiece are stacked, and the inner hole of the lathe is machined to a process size of φ14.2045.0035.0+, and the hole in the fixture is prepared according to the blank of the semi-finished product of the workpiece. The gap is 0.015 to 0.025 mm. The inner hole machining pattern of the disc spring is based on the inner hole of the workpiece, and the tooling mandrel is prepared to φ14.202.001.0+. After stacking the workpiece, the outer circumference of the workpiece is machined to φ2807.005.0, and the inner and outer circles are coaxial. Degree ≤0.015. The forming of the press-formed disc spring is directly related to the stamping parameters and precision design. When designing the stamping pattern, not only the heat-recovery and shrinkage deformation, the full compression deformation and the grinding allowance in the subsequent processes are considered, but also the rebound performance of the workpiece material is accurately measured and controlled. Through a large number of process tests and repeated mold repairs, after mastering the variation rules of the workpiece process parameters, the compression molding angle is set to α = θ + 4.3 °, and the final forming angle of the workpiece is θ ≈ 6.5 °. If the clearance between the mandrel and the workpiece is too small, the mold cannot be demolded; if it is too large, the geometric accuracy such as the coaxiality φ=0.06 mm and the inner diameter and height cannot be guaranteed.
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