【導(dǎo)讀】我國一次能源的主體。采掘機(jī)械化是煤炭工業(yè)增加產(chǎn)量、提高勞動生產(chǎn)率、源、人力和原材料消耗的有效技術(shù)措施。建國以來，我國煤礦采掘機(jī)械化從。無到有，不斷發(fā)展，日趨完善。生產(chǎn)技術(shù)從過去的手鎬落煤和人力拉筐、背?？鸬纳a(chǎn)方式發(fā)展為普通機(jī)械化和綜合機(jī)械化采煤。國家正在實(shí)施大公司、模5000萬t的大型企業(yè)。經(jīng)歷了幾個重要的發(fā)展階段。20世紀(jì)50年代，是機(jī)械化采煤的初級階段。采煤工作面使用截煤機(jī)和。康拜因及模鍛鏈刮板輸送機(jī)，主要用木支柱支護(hù)頂板。20世紀(jì)60年代，采煤機(jī)械化得到初步發(fā)展。先后研制成功MLQ-64、一方面，自行生產(chǎn)采煤機(jī)、研制綜合機(jī)械化采煤設(shè)備。壓支架，張家口煤機(jī)廠、西北煤機(jī)廠試制配套刮板輸送機(jī)。礦提供成套中、厚煤層綜合機(jī)械化采煤設(shè)備。法國、波蘭、前蘇聯(lián)引進(jìn)43套綜采設(shè)備裝備重點(diǎn)煤礦。五”國家攻關(guān)項(xiàng)目“日產(chǎn)7000t綜采成套設(shè)備的研制”。統(tǒng)完成工業(yè)性試驗(yàn)。組成部分大體相同。雙滾筒采煤機(jī)由電動機(jī)、截割部、牽引部以及附屬

　　

【正文】 也 就越嚴(yán)重。如需更多全套圖紙和論文資料，請聯(lián)系扣扣九七一九二零八零零 36 實(shí)際加工出現(xiàn)的現(xiàn)象與上述分析完全一致，這說明公式 (3)的分析是完全正確的。 由上面的分析可知，公式 (2)造成凸輪槽為上寬下窄喇叭口的主要原因是， Pl 和 Pr 點(diǎn)對應(yīng)的轉(zhuǎn)角是按照這兩個點(diǎn)自己的弧長值 Sl 和 Sr 來計(jì)算的，而 Sl 和 Sr 是不等于槽腔中心點(diǎn) Po 的弧長值 So。因此，如果 Pl 和 Pr 點(diǎn)對應(yīng)的轉(zhuǎn)角均按照槽腔中心點(diǎn) Po 的弧長值 So 來計(jì)算，就可以消除這種喇叭槽現(xiàn)象。根據(jù)這種思路，重新構(gòu)造坐標(biāo)轉(zhuǎn)換公式。 在圓柱面的二維展開平面上，設(shè)槽腔中心線展開曲線上 的一個點(diǎn)為Po(xo,so)，加工兩個側(cè)表面上對應(yīng)刀位點(diǎn)在展開曲線上的點(diǎn)為 Pl(xl,sl)和Pr(xr,sr)，那么，坐標(biāo)轉(zhuǎn)換公式為： (4) 應(yīng)用公式 (4)生成的刀位軌跡加工圓柱凸輪槽時，結(jié)果完全符合上述的設(shè)想，加工出來的圓柱凸輪槽已經(jīng)沒有了上寬下窄的喇叭槽現(xiàn)象，而是真正的上下等寬矩形 槽。 參考文獻(xiàn)： W C,Van Y Design Trens for the Redesign of Product From Design Studies (2):173_180 J,Liu C error correction method for CNC machine tools using reference of NAMRE/SME,1994. G machine tool task forch. Bal Harbour Bal Habour Hotel,1980. Feedback control of Dynamis .systems,4E. 如需更多全套圖紙和論文資料，請聯(lián)系扣扣九七一九二零八零零 37 英文原文 Wide Trough Column Cam Numerical Control Processing Research Summary: Some questions produces which in view of the traditional milling method processing column cam, proposed one kind in view of the trough spaciously in the cutting tool diameter column cam path numerical control milling processing method. Through the analysis research, has established one kind of correct coordinates transformation model, and processes according to this conforms to the request wide trough column cam. Keywords: Numerical control processing Coordinates Transformation width trough column cam Main Text The column cam path is generally surrounds according to the certain rule in the round cylinder and so on the wide trough. Must satisfy below to the column cam path numerical control milling processing requests: column cam path 如需更多全套圖紙和論文資料，請聯(lián)系扣扣九七一九二零八零零 38 working surface namely two sides plane of normal section lines must be strict parallel。 column cam path must wait for the width in the work section. This is guarantees the roller in the column cam path the steady motion essential condition. When column cam path width not big, may find the corresponding diameter the end mill to carry on the processing along the trough cavity middle line, pared with is easy to process conforms to the above request column cam path. According to the existence information introduced that, at present the column cam milling processing all is realizes with this means. Because this method has too many limitations, brings many difficulties for the actual milling processing. For example when cannot find with the trough width size equal standard cutting tool, must carry on to the cutting tool changes the system. Regarding the trough width size big column cam path, is very difficult to find the diameter and the trough width equal standard cutting tool. Even if has the corresponding cutting tool, but also must consider the engine bed main axle output and the main axle and the work clothes jig rigidity limit, specially engine bed main axle structure to cutting tool limit. For example the numerical control engine bed host axle neck is 7: 24 40 inner cones, uses for parts JT40 the tool system, then most greatly only can use φ20mm end mill (no matter straight handle bit holder). This regarding the trough width is the 38mm column cam (is processing cam which this article narrates) said is unable to process, must seek the new processing method. Under and analyzes the research according to the experience, introduced 如需更多全套圖紙和論文資料，請聯(lián)系扣扣九七一九二零八零零 39 one kind is smaller than the cam path width end mill with the diameter to carry on the numerical control processing to the column cam path the method, calls it the width trough column cam numerical control processing. First, Processing craft The column cam path is surrounds in the round cylinder and so on the width trough, when its processing often is bigger than 360176。. along the circumference surface milling scopeIs suitable for with to have the numerical control rotary abutment the vertical numerical control milling machine to carry on the processing. According to the column cam actual structure, selects the belt key the spindle makes when the cam processing the radial direction and the week to the localization datum, makes the axial localization datum by the spindle ledge, and the nose thread contracts the column cam with the spindle in front of through the nut. The column cam axial and the radial direction size is generally big, in order to overe because the bracket processes time the cutting force creates in the spindle distortion and the processing process produces inspires trembles, uses a supporting on the tailstock, withstands the spindle center bore with the numerical control turnplate rotation spool thread coaxial apex to make the auxiliary supporting. The column cam path base on each section usually is and so on deep, selects the flat base column end mill processing generally. Before the column cam milling processing usually is a solid circular cylinder, must pass through working procedure and so on slot, rough machining, half precision work, 如需更多全套圖紙和論文資料，請聯(lián)系扣扣九七一九二零八零零 40 precision work。 Because the trough cavity width is big, Therefore, except the trough working procedure and a rough machining working procedure part of knives positions path may along beside the trough cavity middle line production, other knife position paths then must be along the trough cavity center alignment left, are right nearby two according to the Corresponding . Figure 1 column cam path twodimensional developed view Second, Solution model In the column cam path numerical control processing, how extracts in each working procedure to process two sides surfaces the knife position path is key. Regarding the periphery on cam path, usually is launches first the round cylinder, extracts this working procedure in the XOS plane to process two sides surfaces