【文章內(nèi)容簡介】 2amp。nbsp。 試驗材料與方法amp。nbsp。amp。nbsp。amp。nbsp。 5br /amp。nbsp。 儀器和設備amp。nbsp。amp。nbsp。amp。nbsp。 5br /amp。nbsp。 藥品與試劑amp。nbsp。amp。nbsp。amp。nbsp。 6br /amp。nbsp。 供試土壤準備amp。nbsp。amp。nbsp。amp。nbsp。 6br /amp。nbsp。 供試品種amp。nbsp。amp。nbsp。amp。nbsp。 6br /amp。nbsp。 試驗設計amp。nbsp。amp。nbsp。amp。nbsp。 7br /amp。nbsp。 小區(qū)分布amp。nbsp。amp。nbsp。amp。nbsp。 7 p class=39。Rgb23239。/p br /amp。nbsp。 樣品處理與分析amp。nbsp。amp。nbsp。amp。nbsp。 8br /amp。nbsp。 土壤樣品：amp。nbsp。amp。nbsp。amp。nbsp。 8br /amp。nbsp。 植株樣品amp。nbsp。amp。nbsp。amp。nbsp。 8br /amp。nbsp。 分析方法amp。nbsp。amp。nbsp。amp。nbsp。 8br /amp。nbsp。 測定方法amp。nbsp。amp。nbsp。amp。nbsp。 8br /amp。nbsp。 基本原理amp。nbsp。amp。nbsp。amp。nbsp。 8br /amp。nbsp。 儀器條件amp。nbsp。amp。nbsp。amp。nbsp。 8br /amp。nbsp。 測定步驟amp。nbsp。amp。nbsp。amp。nbsp。 9br /amp。nbsp。 數(shù)據(jù)統(tǒng)計amp。nbsp。amp。nbsp。amp。nbsp。 9br /3amp。nbsp。amp。nbsp。amp。nbsp。 實驗結(jié)果與分析amp。nbsp。amp。nbsp。amp。nbsp。 9br /amp。nbsp。 水稻不同生長時期積累Cd的動態(tài)變化amp。nbsp。amp。nbsp。amp。nbsp。 9br /amp。nbsp。 水稻不同部位積累Cd的差異amp。nbsp。amp。nbsp。amp。nbsp。 11br /amp。nbsp。 糙米與水稻不同部位Cd含量的線性回歸分析amp。nbsp。amp。nbsp。amp。nbsp。 12br /4amp。nbsp。 結(jié)論amp。nbsp。amp。nbsp。amp。nbsp。 13br /參考文獻amp。nbsp。amp。nbsp。amp。nbsp。 13br /amp。nbsp。 /pP/PP摘amp。nbsp。 要BR隨著中國工業(yè)不斷地發(fā)展，模具行業(yè)也顯得越來越重要。本論文便是設計加工空氣濾清器殼的模具。首先對加工零件進行了加工工藝和結(jié)構(gòu)工藝的分析。通過計算毛坯尺寸和拉深系數(shù)提出了四種方案，最后確定采用落料、正反拉深復合模。對模具的排樣做出了合理的布置，使材料利用率達到較高的水平。計算了沖壓過程中所需要的各種沖壓工藝力，包括落料力、卸料力、壓邊力、拉深力、頂料力等，并對壓力機進行了合理的噸位初選。復合模在結(jié)構(gòu)上采用了正裝的形式，計算出了落料、正拉深和反拉深工作部分的尺寸。對模具的閉合高度進行了合理的確定，還設計出模具的主要零件落料凹模、凸凹模、反拉深凸模、反拉深凹模、凹模固定板等。列出了模具所需零件的詳細清單，并給出了合理的裝配圖。由于拉深的深度較大，對壓力機的電機也進行了功率校核并提出了潤滑的附加工序，能使拉深順利完成。最后對模具的一個主要零件導套進行了簡單的加工工藝路線的制定。本設計對于采用單動壓力機進行正反拉深具有一定的參考作用。(所有權(quán): 畢業(yè)設計網(wǎng) ) span class=39。Uws59939。/span /PP關鍵詞amp。nbsp。 畢業(yè)論文；模具設計；復合模；正反拉深 span class=39。Uws59939。/span /PPABSTRACTBRDevelops unceasingly along with the Chinese industry, the mold profession also appears more and more importantly. The present paper then is designs the processing air filter shell the mold. First has carried on the processing craft and the structure craft analysis to the processing ponents. Proposed through the putation semifinished materials size and the drawing coefficient four kind of plans, finally determined uses falls the material, the pro and con drawing superposable die. Has made the reasonable arrangement to the mold platoon type, enables the material use factor to achieve the high level. Has calculated each ramming craft strength which in the ramming process needs, including falls nearby the material strength, the exdenning strength, the pressure the strength, the drawing strength, the top material strength and so on, and has carried on the reasonable tonnage primary election to the press. The superposable die has used the true thing form in the structure, calculated fell the material, the drawing and the counter drawing effective range size. Closed has carried on the reasonable determination highly to the mold, but also designs the mold the major parts to fall the material concave mold, the convexconcave mold, the counter drawing raised mold, the counter drawing concave mold, the concave mold dead plate and so on. Listed the mold to need the ponents the detailed detailed list, and has produced the reasonable assembly drawing. Because the drawing depth is big, also carried on the power to the press electrical machinery to examine and to propose the lubrication attachment working procedure, could cause the drawing smoothly to plete. Finally led the wrap to mold major parts to carry on the simple processing craft route formulation. This design regarding uses the single acting press to carry on the pro and con drawing to have the certain reference function. p class=39。Uws59939。/p BRamp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。amp。nbsp。am