发动机罩盖隔音棉耐热性工艺参数优化

为了解决发动机罩盖隔音棉受热下荡导致零件与发动机舱内零件干涉磨损影响使用的问题,文章基于田口研究方法对发动机罩盖隔音棉的耐热性能进行工艺参数优化研究。首先用零件下荡量来量化零件耐热性能,将最大下荡量作为观测值,将环境温度作为噪声,建立L18正交阵列开展试验,同时设计了一种贴合实际装车状态、精度高、一致性好的零件下荡量测试方法。通过试验分析得到,当原材料预投料厚度增量为5 mm,发泡原料比例(B料:A料)为2,发泡抗氧化剂含量为1.2%,轻质发泡密度为17 kg/m²时,发动机罩盖隔音棉耐热性能最优。根据极差分析得到影响零件耐热性能程度的顺序为:发泡抗氧化剂含量〉轻质发泡密度>发泡原料比例〉原材料预投料厚度增量。

Optimization of Hood Insulator Heat Resistance Performance Process Parameters

In order to solve the wear problem between the hood insulator and the parts in the engine compartment caused by the insulator sagging after heated by engine compartment high temperature,based on the Taguchi research method,the researches on optimized process parameters are analyzed to improve the heat resistance performance of the part in this paper. Firstly,the heat resistance performance of the parts is quantified by the part sagging values,use the max value as the observation value,and ambient temperature as the noise. Meanwhile,a new test method is designed,which is suitable for the actual use state,high precision and good consistency. Through the test result analysis,when the pre feeding thickness increment of raw material is 5 mm,the proportion of A∶ B material is 2,the foaming antioxidant is 1. 2%,and the light foaming density is 17 kg/m2,the heat-resistant performance of hood insulator is the best. According to the range analysis,the order of influencing the heat resistance of the parts is as follows: foam antioxidant content > light foam density > foam raw material proportion > raw material pre feeding thickness increment.