The design principles for forged cylinders primarily center on strength, rigidity, and manufacturability; the design must satisfy operational requirements while accommodating the constraints of the forging process and subsequent machining.
First, the cylinder's wall thickness, diameter, and length are determined based on working loads, pressure conditions, and the direction of applied forces. The wall thickness must be sufficient to prevent excessive deformation under axial, radial, or torsional loads while avoiding material waste.
Second, the design focuses on optimizing the internal microstructure and stress distribution. The forging process aligns metal grains with the direction of the applied load; therefore, the design should ensure a continuous cross-section and uniform stress distribution, avoiding sharp corners or abrupt sectional changes that could cause stress concentrations. For cylinders requiring sealing or guiding functions, the design must incorporate appropriate seal grooves, guide sleeves, or machining allowances to ensure precision during assembly and operation.
Finally, the design must account for machining and heat treatment requirements. Since forged cylinders typically undergo turning operations on the inner bore, end faces, and outer diameter after forging, adequate machining allowances must be provided, and compensation for dimensional changes or deformation resulting from heat treatment must be considered. The overarching objective is to utilize sound structural design and appropriate dimensional parameters to ensure that the forged cylinder maintains its strength, precision, and durability under conditions of high load, high temperature, or vibration.