摘 要
一個國家是否強大，主要是看這個國家的工業(yè)是否發(fā)達?，F(xiàn)在中國仍處在工業(yè)化中期。中國早在50年代初所處的國際局勢下，選擇了優(yōu)先發(fā)展重工的道路,重工業(yè)中的大多數(shù)產(chǎn)品由機床加工的。床頭箱體是機床的基礎件，通過它把機床主軸、零部件與機床聯(lián)結在一起。床頭箱箱體有精度高的平面和較多的孔系要加工，工序內容多工藝路線長，其加工質量在很大程度上決定著機床的裝配精度與性能。在大中批量生產(chǎn)條件下，大量加工實例分析中看出，工藝方案考慮不周，加工路線設計不好，造成加工差錯，工作量的成倍增加，制造成本上升。對機床床頭箱體的工藝規(guī)程設計問題進行研究，對提高其使用效率和使用質量具有重大實際意義。機床床頭箱工藝的分析采用工序分散、工序集中的原則來優(yōu)化加工工藝的路線， 從而減少銑床和鏜床夾具裝卡的次數(shù)，減少了專用夾具的設計。使其在加工過程中有據(jù)可依并使其具有總結性的經(jīng)驗和理論根據(jù)。對其他的箱體加工工藝分析和夾具設計提供理論性的依據(jù)。

關鍵詞：機床床頭箱；工藝分析；夾具




The process study of processing and the design of boring jig for the Engine bed headstock

Abstract
A country whether formidable, is mainly looked that this national industry to be whether developed. Now China still occupied the industrialization intermediate stage. China as early as located in the early 50s under the international situation, chose has given priority to the heavy industry in the path heavy industry majority products to process by the engine bed. The headstock body is engine bed's foundation, through it the engine bed main axle, the spare part and the engine bed joins in together. The headstock box body has the precision high plane and many Kong Xi must process, the working procedure content multi-craft route is long, its processing quality is deciding engine bed's assembly precision and the performance to a great extent. Under the major and medium volume production condition, processes in the example analysis to see massively, the craft plan consideration week, does not process the location not to be good, creates the processing mistake, work load increase doubled and re-doubled, the production cost rise. Conducts the research to the engine bed headstock body's technological process design question, to raises its use efficiency and the use quality has the significant practical significance. The engine bed headstock craft's analysis uses the working procedure to disperse, the working procedure centralized principle to optimize the processing craft the route, thus reduces the milling machine and the boring lathe jig installs the card the number of times, reduced unit clamp's design. Enables it to have in the processing process according to may depend on and enable it to have the summary experience and the theory basis. Provide the theoretical to other box body processing process study and the jig design basis.

Key Words：Engine bed headstock; Process study; Jig


目 錄
摘 要 I
Abstract II
一、床頭箱的工藝分析 1
（一）床頭箱的功用 1
（二）床頭箱的技術要求 1
（三）審查床頭箱的工藝性 4
1．審查零件圖樣 4
2．審查零件的結構工藝性。 4
二 、床頭箱的生產(chǎn)類型 5
確定床頭箱的生產(chǎn)類型 5
三 、確定毛坯的種類和制造方法 6
確定毛坯的種類 6
二）毛坯制造方法的考慮因素 6
1．材料的工藝性能 6
2．毛坯的尺寸、形狀和精度等級 6
3．零件的生產(chǎn)綱領 6
四、擬訂床頭箱的工藝路線 7
（一）定位基準的選擇 7
1．精基準的選擇 7
2．粗基準的選擇 7
（二）表面加工方法的確定 7
（三）加工階段的劃分 10
1．粗加工階段 10
2．半精加工階段 10
3．精加工階段 10
（四）工序的集中 10
（五）工序順序的安排 11
1．機械加工工序 11
2．熱處理工序 11
3．輔助工序 11
（六）加工工藝路線方案的比較 11
加工工藝路線方案的論證 13
（七）床頭箱的主要面、孔工序尺寸及公差 14
五、機床設備及工藝裝備的選用 17
（一）機床設備的選用 17
（二）工藝裝備的選用 17
六、切削用量、時間定額的計算 18
（一）主要面和孔的切削用量的確定 18
（二）主要面和孔的時間定額的計算 45
七、鏜夾具的設計 54
（一）確定鏜床夾具與機床間的正確位置 54
（二）確定鏜床夾具與床頭箱的定位與夾緊 54
結 論 58
參 考 文 獻 59
附錄 60
致 謝 78