張瑞*，張?jiān)赂?/p>

（山東山推機(jī)械有限公司，山東 濟(jì)寧 272000）

發(fā)動(dòng)機(jī)罩涂裝前處理彈丸殘留問(wèn)題研究及解決方案

張瑞*，張?jiān)赂?/p>

（山東山推機(jī)械有限公司，山東 濟(jì)寧 272000）

介紹了推土機(jī)發(fā)動(dòng)機(jī)罩拋丸處理后殘留彈丸的危害，并從工件結(jié)構(gòu)方面說(shuō)明了殘留原因。針對(duì)在底護(hù)板裝配過(guò)程中殘留彈丸進(jìn)入螺紋孔并造成螺栓卡死或斷裂的問(wèn)題提出了 3種解決思路。通過(guò)分析實(shí)際情況，選擇在螺紋孔上點(diǎn)焊堵板以防彈丸進(jìn)入的方案并進(jìn)行了工藝試驗(yàn)。在此基礎(chǔ)上應(yīng)用到生產(chǎn)中，最終證明了該方案的可行性。

發(fā)動(dòng)機(jī)罩；前處理；拋丸；彈丸殘留；堵板；螺栓

First-author's address： Shandong Shantui Mechanical Ltd.， Jining 272000， China

拋丸作為結(jié)構(gòu)件高效的涂裝前處理及表面強(qiáng)化、焊縫去應(yīng)力處理工藝，在農(nóng)業(yè)、工程、礦山等機(jī)械行業(yè)得到廣泛應(yīng)用［1-5］。但是，由于拋丸器拋射出的彈丸速率大，薄板件會(huì)被拋?zhàn)冃?。而且如果丸料硬度高，還會(huì)破壞精加工表面及螺紋［6-7］。另外，拋丸后工件上易殘留彈丸，不僅會(huì)浪費(fèi)彈丸，而且會(huì)給后續(xù)噴漆、裝配，甚至是產(chǎn)品的用戶(hù)及市場(chǎng)帶來(lái)不良影響［8］。因此拋丸時(shí)不僅要屏蔽保護(hù)精加工表面，而且要清理殘留彈丸。工件結(jié)構(gòu)不同，屏蔽措施、清理彈丸的難易程度也不相同，尤其是存在腔體結(jié)構(gòu)的工件，由于開(kāi)口小或存在死角等，彈丸一旦進(jìn)入就難以徹底清理。如何讓這些不能徹底清理出來(lái)的彈丸不影響后面的工序或產(chǎn)品的使用，是結(jié)構(gòu)件涂裝工藝人員面臨的問(wèn)題。

Study and solution of the problem about residual shot blasting pills in coating pretreatment process for engine hood

// ZHANG Rui*， ZHANG Yue-fu

The harm of residual pills on bulldozer engine hood after shot blasting pretreatment was introduced. The causes for residual of pills were explained from the aspect of the structure of engine hood. Three methods were presented aiming to solve the problem about stagnation or fracture of bolt caused by residual pills entering the threaded hole during the assembly of guard shield. Based on analyzing the practical situation， a method was chosen by which a protective baffle was spot welded on the top of the threaded hole to avoid the entering of residual pills. Experiment was carried out for further use. The method has been applied to practical production and proved to be feasible.

engine hood； pretreatment； shot blasting； pill residual； baffle； bolt

TQ639

B

1004 - 227X （2015） 06 - 0339 - 04