基于喷丸随机模型的表面覆盖率计算方法

Calculation Method of Surface Coverage Based on Shot Peening Random Model

为了揭示金属结构表面喷丸处理过程中覆盖率的变化规律,通过分析喷丸随机模型的建模流程及靶材的喷丸后形貌,利用MATLAB软件开发了基于喷丸随机模型的覆盖率计算程序,并将此与传统覆盖率计算方法进行了对比.结果表明:以直径为1.0 mm,速率为50 m/s的弹丸对构件进行喷丸处理,当弹丸数目N<20时,新方法(MATLAB法)与传统方法(PEEQ法和理论公式法)的计算结果较接近;随着弹丸数目的增加,在达到全覆盖之前,3种方法的计算覆盖率为C_(PEEQ)>C_(th)>C_(MATLAB);全覆盖时,3种方法所对应的弹丸数目分别为100、140和190.

To reveal the coverage variation in shot peening process for metal structure, a MATLAB program was designed to calculate the coverage by analyzing the modeling process of shot peening random model and target morphology after shot peening. Also, the developed method was compared with the traditional coverage calculation methods. The comparison shows that, with shot diameter of 1 mm and velocity of 50 m/s, when the shot number N is less than 20, the results from the developed coverage calculation （MATLAB method） are approximate to those from the traditional methods （PEEQ method and theoretical formula method）. With the increase of shot number, it shows CpEEQ 〉 Cth 〉 CMATLAB before reaching full coverage. When there is full coverage, the shot numbers corresponding to three methods are 100, 140 and 190, respectively.