【導讀】后進行了工藝規(guī)程設計，最后進行夾具設計。此次設計是對195氣門搖臂軸支座。于面比孔易加工，在制定工藝規(guī)程時，就先加工面，再以面為基準來加工其它，其中各工序夾具都采用專用夾具，其機構(gòu)設計簡單，方便且能滿足要求。

　　

【正文】 同，但是都能在討論中發(fā)現(xiàn)各自的問題，并互相提出解決的方法，設計能夠順利完成。 再次感謝教導過我?guī)椭睦蠋焸?，沒有你們嚴謹?shù)慕虒W態(tài)度我不可能學到應有的理論 ，也不可能順利完成設計工作，沒有老師對我嚴格的要求也不可能使 我明白 弘志勵學，德才 并蓄的道理，我想這種理工的作 風會指導我在今后的學習工作中不斷完善自己。 沈陽理工大學學士學位論文 31 參考文獻 [1] 趙如福 . 金屬機械加工工藝人員手冊 . 第三版 . 上?？茖W技術(shù)出版社 1983 [2] 崇凱 主編 . 機械制造技術(shù)基礎課程設計指南 . 化學工業(yè)出版社 20xx [3] 曹巖 白瑀 主編 . 機床夾具手冊與三維圖庫 化學工業(yè)出版社 20xx [4] 馮辛安 主編 . 機械制造裝備設計 . 第三版 . 機械工業(yè)出版社 20xx [5] 于大國 主編 . 機械制造技術(shù)基礎與機械制造工藝學課程設計教程 國防工業(yè)出版社 20xx [6] 陳宏鈞 主編 . 實用機械加工工藝手冊 . 第三版 . 機械工業(yè)出版社 20xx [7] 劉傳紹 蘇建修 主編 . 機械制造工藝學 電子工業(yè)出版社 20xx [8] Overview of engine cylinder head machining process. machine china. 中國機械雜志社 20xx 年 20 期 沈陽理工大學學士學位論文 32 附錄 a Overview of engine cylinder head machining process ? First, the function of the engine cylinder head Cylinder head of the engine of the main parts, the upper part of the engine, the cylinder liner via the bottom plane, with bolts on the cylinder body. The main function is as follows: 1, the closed upper cylinder and the piston and the cylinder wall at the top with a bustion chamber. 2, as a setvalve engine valve train, intake and exhaust pipe and the outlet pipe assembly base. 3, inside the cylinder head cooling water jacket, the bottom surface of the cooling water hole of the cylinder block cooling water hole municating in order to use the engine temperature circulating water away. ? Second, the structural characteristics of the cylinder head the cylinder head should have sufficient strength and rigidity to ensure that the gas pressure and under the action of thermal stress, work reliably. cylinder head shape is generally hexahedral, based porous thin pieces, of which we are now 481 cylinder head, processing up to 100 the number of holes. Casting is only mm at the thinnest. ? Third, the head material and blank manufacturing 1, cylinder head material: Cylinder head material, and now the engine manufacturers generally use aluminum. Because aluminum thermal conductivity is better, is conducive to an appropriate increase in pressure pression ratio, the quality is also lighter, you can reduce the vehicle, the whole weight. But the difference in stiffness aluminum alloy cylinder head, easily deformed during use. cylinder head attachment, previously valve seat material monly used heatresistant alloy cast iron, cast iron valve guides monly used. Powder metallurgy is now the seat of the valve and conduit on the use of more and more, and many plex shapes can also be casting, without reprocessing it. However, abrasion 沈陽理工大學學士學位論文 33 resistance than cast iron. ? Crack: casting stress caused。 ? Cold partment: aluminum casting process water cooling rate caused inconsistent。 ? loose surface: aluminum water pouring temperature irregularity or improper ingredients。 ? stomatal: casting aluminum water mixed with air。 ? trachoma: cast aluminum water mixed with impurities。 ? dip sand: improper or no workpiece temperature baked shot and so on. ? Four, cylinder head machining difficulties: ? 1, plane processing ? the cylinder head top surface, a bottom surface and into the exhaust area planar faces are large, high precision (flatness verticality, the position degree of ), and may be the basis for all of the process, for example, the cylinder 480 Cover is. ? This geometric accuracy of the machine and tool adjustment is relatively high precision. ? Previous large flat cylinder head machining, machining with carbide blade, and with a diamond blade Danxiu Guang. Now, if the situation is good rough, all using diamond blade for processing, may well improve the surface roughness after processing. ? 2, highprecision machining holes ? cylinder head valve seat tube hole, holes, etc. tappet camshaft bore holes and the Department has with the relationship. Its dimensional accuracy, position accuracy and surface roughness requirements are extremely stringent. So these highprecision machining holes of cylinder head technology process is the core process, should be given full attention. ? 1, cylinder head valve seats, valve guides finishing ? cylinder head valve seats, valve guides with both the engine valve, so that the coaxial degree is relatively high。 additional valve seat for sealing engagement with the valve cone, the roundness requirements are very high. ? For the processing of these parts, now 480 head breaks down as follows: ? Fast Forward spindle work into spindle restart processing valve seat cone 沈陽理工大學學士學位論文 34 spindle stop and back end of the spindle distance restart gun reaming valve guides ( QianTong) finished processing workers and retract spindle pushed back. ? The benefit is that once positioned, processing is plete valve guides and valve seat, positioning error can reduce duplication and improve the valve guides and valve seat concentricity. ? In addition, the spindle after the restart, machining the valve seat when the feed direction if the radial direction along the seat, processing methods such as car seat, providing precision. If the feed direction along the axial direction of the valve seat, called countersink or Boring seat. ? Because the valve seat and valve guide material change in the selection process of the tool is constantly changing. Carbide inserts before gradually replaced CBN inserts, great processing efficiency and provide quality. And if there is copper powder material valve seat and valve guide, PCD inserts can also be used for processing. ? 2, cylinder head tappet hole bottom outlet valve guide machining These hole machining, although precision is relatively high, however, as long as the selected allowance, and the tool, the process basically