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1、Manufacturing Process Considerations 零件的結(jié)構(gòu)工藝性,Casting structure 鑄件結(jié)構(gòu) Common machining structures 機加工常見結(jié)構(gòu) Structure of drill hole 鉆孔結(jié)構(gòu),,請點擊相應標題顯示其內(nèi)容,Casting structure 鑄件結(jié)構(gòu),Sand box cover Overflow Pouring head 上砂箱 冒口 澆口,,,,,1. Draft 起模斜度:,The 120（3）draft along the drawing direction of the patter
2、n facilitates to take out the pattern while molding. 鑄件造型時，為便于取出木模，沿脫模方向的表面做出120（3）的起模斜度。,請點擊鼠標左鍵顯示后面內(nèi)容,If the draft is very small, it can be omitted, If necessary, it can be included in technical.起模斜度較小時, 在圖中一般不畫出, 必要時可注寫在技術(shù)要求中。,Sand box 下砂箱,Model 模型,Cavity 型腔,Sand 型砂,,,,,,,,,,,,,,,,,2. Fillets in
3、 castings 鑄造圓角:,There must be a radius where two surfaces meet, in order to avoid sand drops while removing the mould and shrinkage cavity and shrinkage crack while cooling. 在鑄件表面相交處應有圓角,以免 脫模時砂型落砂,同時防止鑄件冷卻時產(chǎn)生裂紋或縮孔。,Machine symbol 機加工符號,請點擊鼠標左鍵顯示后面內(nèi)容,Casting structure 鑄件結(jié)構(gòu),The intersection line is
4、 needed in order to distinguish the various surfaces. The one we have provided is called run-out line. The representation of a transition line is similar to that of intersection line. The only difference is that the end of the run-out line is not connected with the contour line of the radius, and th
5、e line style is a thin solid line. 為了區(qū)分不同形體的表面,仍要畫出相貫線,這種相貫線稱為過渡線。過渡線的畫法和相貫線相同,只是其端點處不與圓角輪廓線接觸,且線型為細實線。,,3. Wall thickness 鑄件的壁厚:,To avoid shrinkage cavity and shrinkage crack caused by different cooling speeds. During the design phase, it is a must to maintain uniform wall thickness or a smooth. On
6、e must avoid unequal designs such as thickness abrupt varying or local thick partial areas. 為防止?jié)茶T零件 時,由于壁厚不勻而冷卻速度不同產(chǎn)生的縮孔和裂紋, 在設計鑄件 時, 應使壁厚盡量均勻或逐漸過渡, 以避免壁厚突變或局部肥大的 不勻現(xiàn)象。,請點擊鼠標左鍵顯示后面內(nèi)容,Smooth transition 平滑過渡,Casting structure 鑄件結(jié)構(gòu),Maintain uniform wall thickness 壁厚均勻,1. Boss club and recessed surfac
7、e 凸臺與凹坑：,Usually, all surfaces mounted on other parts need to be machined. The boss or recessed surface is added to keep good contact between the surfaces of two parts and to reduce the machining area and manufacturing cost. 零件上凡與其他零件接觸的表面一般都要加工，為了保證兩零件表面的良好接觸，同時減少加工面積，以降低制造費用，在零件的需接觸表面處常設計成凸臺、凹坑的形式
8、。,請點擊鼠標左鍵顯示后面內(nèi)容,,,,,Common machining structures 機加工常見結(jié)構(gòu),2. Chamfer and round 倒角與圓角:,To eliminate burrs and flashes in order to prevent human hands from cutting and to facilitate mounting, the ends of both the shaft and the hole usually need to be chamfered.為了去除零件的毛刺、銳邊，以防止劃傷人手和便于裝配，在軸和孔的端部通常需加工出倒角。,
9、Avoid cracks避免斷裂,That is, the sharp edge of shaft end is cut by a conical cutting tool with a 45 degree apex angle. 即用一錐頂角為45的圓錐刀頭切除其端部銳邊。,,請點擊鼠標左鍵顯示后面內(nèi)容,Common machining structures 機加工常見結(jié)構(gòu),An arc transition usually remains at the shaft shoulder, which is called round, in order to avoid cracks cause
10、d by pressure concentration. 在軸肩處，常常制成圓弧過渡，即圓角，以避免因應力集中而產(chǎn)生裂紋。,Common machining structures 機加工常見結(jié)構(gòu),,,,,,,,,,,,,,,,,Undercut 退刀槽,Undercut 退刀槽,Grinding undercut 砂輪越程槽,Grinding undercut 砂輪越程槽,Grinding surface 精磨表面,Grinding surface 精磨表面,,,,,,,,,,,,,,,,3. Escape and grinding undercut 螺紋退刀槽和砂輪越程槽:,,An esca
11、pe, grinding or traveling limit undercut needs to be produced at the end of the surface to be machined, in order to easily withdraw the cutter or grinding wheel while tapping or grinding external diameter. 在車削螺紋或磨外圓時,為便于退刀 或使用砂輪, 需要在待加工面末端先切出退刀槽或砂輪越程槽。,請點擊鼠標左鍵顯示后面內(nèi)容,The dimension of the escape is id
12、entified as widthdepth or widthdiameter. 退刀槽及越程槽的尺寸注成“寬度深度” 或“寬度直徑”。,,,,,,The axis of the drill should be perpendicular to the surface to be drilled, in order to ensure correct drilling position and prevent the drill from breaking caused by unequal impact force. 用鉆頭鉆孔時，為保證鉆孔位置準確和避免鉆頭因受力不均而折斷，應使鉆頭軸
13、線垂直于被鉆孔零件的表面。,請點擊鼠標左鍵顯示后面內(nèi)容,Structure of drill hole 鉆孔結(jié)構(gòu),The intersection point where the hole and the oblique plane meet is necessary to set to platform and notch structure. If the angle between the drill and the oblique plane is larger than 60, one can drill the hole directly. 在與孔軸線傾斜的表面處,常需設計出平臺
14、或凹坑結(jié)構(gòu),但當鉆頭與傾斜面的夾角大于60時,也可以直接鉆孔。,本 小 節(jié) 結(jié) 束,謝謝您的認真學習！,退出,前一頁,Casting structure 鑄件結(jié)構(gòu),不與輪廓線接觸,在圖片上點擊鼠標左鍵 “暫?！被蛟俅巍安シ拧?Casting structure 鑄件結(jié)構(gòu),在切點附近斷開,在圖片上點擊鼠標左鍵 “暫?！被蛟俅巍安シ拧?Casting structure 鑄件結(jié)構(gòu),在圖片上點擊鼠標左鍵 “暫停”或再次“播放”,Casting structure 鑄件結(jié)構(gòu),在圖片上點擊鼠標左鍵 “暫?！被蛟俅巍安シ拧?Common machining structures 機加工常見
15、結(jié)構(gòu),請 點 擊 鼠 標 左 鍵 顯 示 后 面 內(nèi) 容,Grinding surface by grinding wheel 砂輪正在精磨工件的表面,Common machining structures 機加工常見結(jié)構(gòu),,Structure of drill hole 鉆孔結(jié)構(gòu),Surface structure of the drill hole 鉆孔的表面結(jié)構(gòu),Representation of the hole and dimension of a drill 鉆孔的尺寸標注,Grinding external diameter by grinding wheel 砂輪正在精磨斜齒軸的外圓面,Grinding undercut 砂輪越程槽,Common machining structures 機加工常見結(jié)構(gòu),在圖片上點擊鼠標左鍵可以“暫?！被蛟俅巍安シ拧?在圖片上點擊鼠標左鍵可以“暫?！被蛟俅巍安シ拧?在圖片上點擊鼠標左鍵可以“暫?！被蛟俅巍安シ拧?在 圖 片 上 點 擊 鼠 標 左 鍵 可 以 “暫 停” 或 再 次 “播 放”,
《零件的結(jié)構(gòu)工藝性》PPT課件.ppt
