Forging allowance obtaining method

The invention relates to the technical field of metal forging, in particular to a forging allowance obtaining method. The forging allowance obtaining comprises the following steps that the forging heating pollution layer depth Q is obtained according to a first rule; obtaining a forging defect depth D according to a second rule; obtaining a forge piece form and location tolerance vector sum rho according to a third rule; and according to a fourth rule, the machining clamping error # imgabs0 # of the forge piece is obtained, and according to Q, D, rho and # imgabs1 #, the allowance delta Z of the forge piece is obtained according to a fifth rule. Therefore, the problem that the forging allowance is difficult to determine is solved. 本发明涉及金属锻造技术领域，具体而言，涉及一种锻件余量获取方法。锻件余量获取包括以下步骤：根据第一规则获取锻件加热污染层深度Q；根据第二规则获取锻件缺陷深度D；根据第三规则获取锻件形位公差矢量和ρ；根据第四规则获取锻件机加工装夹误差#imgabs0#根据Q、D、ρ和#imgabs1#按照第五规则获取锻件余量ΔZ。这样就解决了锻件余量难以确定的问题。