裝配圖滾筒式拋丸清理機(jī)的總體和結(jié)構(gòu)設(shè)計(jì)(1),裝配,滾筒,拋丸,清理,清算,總體,整體,以及,結(jié)構(gòu)設(shè)計(jì) 南昌航空大學(xué)科技學(xué)院學(xué)士學(xué)位論文 畢業(yè)設(shè)計(jì)（論文）任務(wù)書 I、畢業(yè)設(shè)計(jì)(論文)題目：滾筒式拋丸清理機(jī)的總體和結(jié)構(gòu)設(shè)計(jì) II、畢 業(yè)設(shè)計(jì)(論文)使用的原始資料(數(shù)據(jù))及設(shè)計(jì)技術(shù)要求： 1．原始資料： ①．滾筒式拋丸清理機(jī)的設(shè)計(jì)規(guī)格φ1000×800mm； ②．滾筒式拋丸清理機(jī)的其它主要技術(shù)參數(shù)：滾筒轉(zhuǎn)速3r/min；最大有效容積0.1m3 ； 最大載重量300kg ；工件長(zhǎng)度400mm；工件單重15kg ；拋丸量100kg/min ；葉輪直徑420mm ； 葉輪轉(zhuǎn)速2300r/min ；拋射速度60m/s 2．設(shè)計(jì)技術(shù)要求： ①　根據(jù)主要技術(shù)參數(shù)設(shè)計(jì)滾筒式拋丸清理機(jī)的的結(jié)構(gòu)。 ②　要求英文資料翻譯忠實(shí)原文。 ③　要求完成的設(shè)計(jì)能滿足實(shí)際要求，圖面及文字說明表達(dá)簡(jiǎn)潔、清晰、易讀懂， 圖紙?jiān)O(shè)計(jì)規(guī)范，符合制圖標(biāo)準(zhǔn)。能用于指導(dǎo)實(shí)際的生產(chǎn)、裝配。 ④　要求畢業(yè)論文敘述條理清楚，設(shè)計(jì)計(jì)算正確，論文格式規(guī)范。 III、畢 業(yè)設(shè)計(jì)(論文)工作內(nèi)容及完成時(shí)間： 1．收集有關(guān)資料，寫出開題報(bào)告； 第1周-第2周 2．外文翻譯(6000字符以上)； 第3周 3．分析與研究：了解現(xiàn)有類似設(shè)備的工作原理，制訂設(shè)備工作原理圖。 第4周-第5周 4．滾筒式拋丸清理機(jī)的主要結(jié)構(gòu)設(shè)計(jì)及計(jì)算。 第6周-第10周 5．滾筒式拋丸清理機(jī)的各主要配件圖和總裝圖的繪制。 第11周-第14周 6．撰寫畢業(yè)論文一份 第15周-第16周 7．畢業(yè)設(shè)計(jì)審查、畢業(yè)答辯 第17周 Ⅳ 、主 要參考資料： ［1］. 王大康，盧頌峰.機(jī)械設(shè)計(jì)課程設(shè)計(jì). 北京：北京工業(yè)大學(xué)出版社， 2002.2。 ［2］. 汪愷.機(jī)械工業(yè)基礎(chǔ)標(biāo)準(zhǔn)應(yīng)用手冊(cè).北京：機(jī)械工業(yè)出版社，2001.6。 ［3］. 機(jī)械設(shè)計(jì)手冊(cè)（新版）.第一卷、第二卷、第四卷、第五卷.北京： 機(jī)械工業(yè)出版社，2004.8。 ［4］. 吳宗澤.機(jī)械零件設(shè)計(jì)手冊(cè).北京：機(jī)械工業(yè)出版社， 2003.11。 ［5］. 時(shí)鈞.化學(xué)工程手冊(cè).北京：化學(xué)工業(yè)出版社，1996.1。 ［6］. 日本化學(xué)技術(shù).化工機(jī)械設(shè)計(jì)和保養(yǎng).上海：上?？茖W(xué)技術(shù)文獻(xiàn)出版 社，1985。 ［7］. Calculation of the Dimensions Blades for Drum Dryers. V.F.Pershin, A.A. Koryagin,V.L.Negrov, and A.G.Sidel'nikov. Khimicheskoe i Neftyanoe Mashinostroenie, No. 11, pp. 21-22, November。 航空制造工程 學(xué)院 機(jī)械設(shè)計(jì)制造及其自動(dòng)化 專業(yè) 0781053班 學(xué)生（簽名）： 日期： 自 2011 年 3 月 1 日至 2011 年 6 月 2 日 指導(dǎo)教師（簽名）： 助理指導(dǎo)教師(并指出所負(fù)責(zé)的部分)： 機(jī)械制造工程 系（室）主任（簽名）： 附注:任務(wù)書應(yīng)該附在已完成的畢業(yè)設(shè)計(jì)說明書首頁。 南昌航空大學(xué)科技學(xué)院學(xué)士學(xué)位論文 畢業(yè)設(shè)計(jì)（論文）開題報(bào)告 題目： 滾筒式拋丸清理機(jī)的總體和結(jié)構(gòu)設(shè)計(jì) 系 別 航空工程系 專業(yè)名稱 機(jī)械設(shè)計(jì)制造及其自動(dòng)化 班級(jí)學(xué)號(hào) 078105335 學(xué)生姓名 楊挺 指導(dǎo)教師 張曉榮 二O一一 年 6 月  說 明 開題報(bào)告應(yīng)結(jié)合自己課題而作，一般包括：課題依據(jù)及課題的意義、國(guó)內(nèi)外研究概況及發(fā)展趨勢(shì)（含文獻(xiàn)綜述）、研究?jī)?nèi)容及實(shí)驗(yàn)方案、目標(biāo)、主要特色及工作進(jìn)度、參考文獻(xiàn)等內(nèi)容。以下填寫內(nèi)容各專業(yè)可根據(jù)具體情況適當(dāng)修改。但每個(gè)專業(yè)填寫內(nèi)容應(yīng)保持一致。 一、選題的依據(jù)及意義： 本人的課題選自學(xué)校老師。拋丸清理機(jī)利用高速回轉(zhuǎn)的葉輪，將彈丸拋向滾筒內(nèi)不斷翻轉(zhuǎn)的鑄件或鍛件來清除其表面的殘余型砂或氧化鐵皮。清理均勻，生產(chǎn)率高，適宜于中小型鑄鍛車間清理15kg以下的小件使用。 　　本機(jī)設(shè)計(jì)時(shí)帶有單獨(dú)的集塵裝置，故安裝地點(diǎn)不受車間通風(fēng)管路的限制，且衛(wèi)生條件好。本機(jī)設(shè)有自動(dòng)停車裝置，故操作簡(jiǎn)便 。該產(chǎn)品適用于清理各種不怕碰撞、劃傷的鑄、鍛件。是小型鑄、鍛、熱處理車間清理工件表面殘砂、氧化皮的理想設(shè)備。主要由滾筒、分離器、拋丸器、提升機(jī)、減速電機(jī)等組成。利用高速旋轉(zhuǎn)的葉輪將彈丸拋向滾筒內(nèi)部不斷翻轉(zhuǎn)的工件，使工件表面的附著物迅速脫落，從而獲得一定粗糙度的光潔表面，達(dá)到清理的目的。 二、國(guó)內(nèi)外研究概況及發(fā)展趨勢(shì)（含文獻(xiàn)綜述）： 拋丸機(jī)是機(jī)械產(chǎn)業(yè)中的通用基礎(chǔ)設(shè)備，廣泛應(yīng)用于船舶、汽車工程、機(jī)械制造等行業(yè)的除銹、拋光、清砂等金屬表面處理，國(guó)內(nèi)外市場(chǎng)需求巨大。?? ??? ?國(guó)產(chǎn)拋丸清理機(jī)的市場(chǎng)前景廣闊??。日、韓這樣的高度發(fā)達(dá)與中等發(fā)達(dá)國(guó)家，國(guó)內(nèi)基本建設(shè)市場(chǎng)已經(jīng)飽和，其國(guó)內(nèi)的工程機(jī)械市場(chǎng)已停滯或萎縮，拋丸機(jī)清理機(jī)等工程建設(shè)機(jī)械很多依靠出口。而我國(guó)整個(gè)社會(huì)工業(yè)化進(jìn)程尚未完成，大量的鐵路、公路、水利基本建設(shè)正在和將要進(jìn)行。大、中、小城市的交通、房屋建設(shè)方興未艾，給拋丸機(jī)清理機(jī)等工程機(jī)械提供了大量的市場(chǎng)機(jī)會(huì)。 　? 進(jìn)入21世紀(jì)以來，馬鞍山驚天公司、湖南山河公司已推出自己商標(biāo)的拋丸機(jī)清理機(jī)。目前，較具規(guī)模的國(guó)內(nèi)生產(chǎn)廠家有：驚天公司、山河公司和長(zhǎng)治液壓件廠。但國(guó)內(nèi)產(chǎn)品的市場(chǎng)占有率仍很低，大部分市場(chǎng)被韓、日本、德國(guó)的產(chǎn)品所占有。商機(jī)不可失，國(guó)內(nèi)的企業(yè)家應(yīng)抓住這一產(chǎn)品市場(chǎng)大發(fā)展的機(jī)會(huì)，精心制造，不斷創(chuàng)新，擴(kuò)大銷售，奪回國(guó)內(nèi)市場(chǎng)，甚至出口到國(guó)外。 三、研究?jī)?nèi)容及實(shí)驗(yàn)方案 ： 1研究?jī)?nèi)容 主要研究滾筒式拋丸清理機(jī)的總體和結(jié)構(gòu)的設(shè)計(jì)。滾筒式拋丸清理機(jī)的拋丸器為主要實(shí)行機(jī)構(gòu)，其性能的好壞直接影響拋丸機(jī)的效率，還有傳動(dòng)系統(tǒng)和集塵裝置也是拋丸機(jī)的主要機(jī)構(gòu)。 2實(shí)驗(yàn)方案 方案一 拋丸器傳動(dòng)：由電動(dòng)機(jī)經(jīng)皮帶輪傳動(dòng)葉輪主軸使葉輪高速旋轉(zhuǎn)。 滾筒傳動(dòng)：由電動(dòng)機(jī)經(jīng)鏈輪傳動(dòng)帶動(dòng)托輪，再以摩擦傳動(dòng)滾筒。集塵器選用旋風(fēng)除塵器。 方案二 拋丸器傳動(dòng)：由電動(dòng)機(jī)經(jīng)齒輪傳動(dòng)葉輪主軸使葉輪高速旋轉(zhuǎn)。 滾筒傳動(dòng)：由電動(dòng)機(jī)經(jīng)由皮帶輪傳動(dòng)帶動(dòng)托輪，再以齒輪傳動(dòng)滾筒。集塵器選用電除塵器。 方案三 拋丸器傳動(dòng)：由電動(dòng)機(jī)經(jīng)鏈輪傳動(dòng)葉輪主軸使葉輪高速旋轉(zhuǎn)。 滾筒傳動(dòng)：由電動(dòng)機(jī)經(jīng)由齒輪傳動(dòng)帶動(dòng)托輪，再以齒輪傳動(dòng)滾筒。集塵器選用旋風(fēng)除塵器。 方案一結(jié)構(gòu)緊湊，布局合理，傳動(dòng)簡(jiǎn)單，可靠性高，使用壽命可以得到保障，制造成本低，加工簡(jiǎn)單。方案二、三效率比較低，加工成本高。經(jīng)過三個(gè)方案的比較，選用方案一。 四、目標(biāo)、主要特色及工作進(jìn)度： 1目標(biāo) 為了清除鑄件或鍛件表面的殘余型砂或氧化鐵皮利用高速回轉(zhuǎn)的葉輪將彈丸拋向滾筒內(nèi)不斷翻轉(zhuǎn)的零件，要求達(dá)到如下目的：（1）綜合運(yùn)用機(jī)械和電器知識(shí)；（2）滾筒傳動(dòng)機(jī)構(gòu)的設(shè)計(jì)；（3）軸的設(shè)計(jì)與校核；（4）滾筒傳動(dòng)機(jī)構(gòu)所有零件的設(shè)計(jì)。該系列產(chǎn)品適用于清理各種不怕碰撞、劃傷的鑄、鍛件。是小型鑄、鍛、熱處理車間清理工件表面殘砂、氧化皮的理想設(shè)備。主要由滾筒、分離器、拋丸器、提升機(jī)、減速電機(jī)等組成。利用高速旋轉(zhuǎn)的葉輪將彈丸拋向滾筒內(nèi)部不斷翻轉(zhuǎn)的工件，使工件表面的附著物迅速脫落，從而獲得一定粗糙度的光潔表面，達(dá)到清理的目的。 2 主要特色 本機(jī)利用高速回轉(zhuǎn)的葉輪將彈丸拋向滾筒內(nèi)不斷翻轉(zhuǎn)的鑄、鍛件，來清除其表面的殘余型砂或氧化鐵皮。清理均勻，適宜中、小鑄，鍛件的清理。本機(jī)帶有集塵裝置，分離效果好，自動(dòng)控制停車。操作、維修簡(jiǎn)便。 3工作進(jìn)度 1．收集有關(guān)資料，寫出開題報(bào)告； （2周）3月1日-3月14日 2．外文翻譯(6000字符以上)； （1周）3月15日-3月22日 3．分析與研究：了解現(xiàn)有類似設(shè)備的工作原理，制訂設(shè)備工作原理圖。 (1周)3月23日-3月31日 4．滾筒式拋丸清理機(jī)的主要結(jié)構(gòu)設(shè)計(jì)及計(jì)算。 （2.5周）4月3日-4月20日 5．滾筒式拋丸清理機(jī)的各主要配件圖和總裝圖的繪制。（以上合計(jì)A0、A3圖共8張）。 （3周）4月21日-5月12日 6．撰寫畢業(yè)論文一份 （2周）5月13日-5月27日 7．畢業(yè)設(shè)計(jì)審查、畢業(yè)答辯 （1周）5月28日-6月2日 五、參考文獻(xiàn) ［1］.王大康，盧頌峰.機(jī)械設(shè)計(jì)課程設(shè)計(jì). 北京：北京工業(yè)大學(xué)出版社，2002.2。 ［2］.汪愷. 機(jī)械工業(yè)基礎(chǔ)標(biāo)準(zhǔn)應(yīng)用手冊(cè). 北京：機(jī)械工業(yè)出版社，2001.6。 ［3］. 機(jī)械設(shè)計(jì)手冊(cè)（新版）.第一卷、第二卷、第四卷、第五卷.北京機(jī)械工業(yè)出版社，2004.8。 ［4］. 吳宗澤.機(jī)械零件設(shè)計(jì)手冊(cè).北京：機(jī)械工業(yè)出版社， 2003.11。 ［5］. 時(shí)鈞.化學(xué)工程手冊(cè).北京：化學(xué)工業(yè)出版社，1996.1。 ［6］. 日本化學(xué)技術(shù).化工機(jī)械設(shè)計(jì)和保養(yǎng).上海：上?？茖W(xué)技術(shù)文獻(xiàn)出版社，1985。 ［7］. Calculation of the Dimensions Blades for Drum Dryers. V.F.Pershin, A.A. Koryagin,V.L.Negrov, and A.G.Sidel'nikov. Khimicheskoe i Neftyanoe Mashinostroenie, No. 11, pp. 21-22, November。 7 南昌航空大學(xué)科技學(xué)院學(xué)士學(xué)位論文 滾筒式拋丸清理機(jī)的總體和結(jié)構(gòu)設(shè)計(jì) 學(xué)生姓名： 楊挺 班級(jí)： 0781053 指導(dǎo)老師： 張曉榮 摘要： 本滾筒式拋丸清理機(jī)的工作原理是利用高速回轉(zhuǎn)的葉輪將彈丸拋向滾筒內(nèi)不斷翻轉(zhuǎn)的錐鑄件或者鍛件，來清除其表面的殘余型砂或者氧化鐵皮、清理均勻、生產(chǎn)效率高，適宜于中、小型鑄鍛車間清理小件使用，解決了小批量零件的清理工作。 設(shè)計(jì)過程中，利用一級(jí)鏈傳動(dòng)減速帶動(dòng)滾筒和提升斗的回轉(zhuǎn)和實(shí)驗(yàn)彈丸的循環(huán)使用。 為了清除鑄件或鍛件表面的殘余型砂或氧化鐵皮利用高速回轉(zhuǎn)的葉輪將彈丸拋向滾筒內(nèi)不斷翻轉(zhuǎn)的零件。要求達(dá)到如下目的：a綜合運(yùn)用機(jī)械和電器知識(shí)；b彈丸循環(huán)及分離裝置設(shè)計(jì)；c除塵器設(shè)計(jì)；d彈丸循環(huán)及分離裝置、集塵器零件的設(shè)計(jì)。 采用一級(jí)齒輪傳動(dòng)帶動(dòng)的拋丸器滾筒的拋丸工作，同時(shí)，運(yùn)用干式旋風(fēng)型除塵裝置進(jìn)行塵土分離工作。彈丸循環(huán)裝置由滾筒護(hù)板于殼體之間的螺旋帶提升斗及分離篩組成。由葉輪拋出的彈丸射擊工件之后，從滾筒護(hù)板上的格子孔進(jìn)入護(hù)板與筒殼體之間得空隙內(nèi)，借助螺旋作用流到旋轉(zhuǎn)的提升斗內(nèi)。提升到上部，經(jīng)過分離篩去毛刺、釘子、芯骨、砂、粒等。完整的彈丸經(jīng)導(dǎo)入管再送入拋丸器內(nèi)。 設(shè)計(jì)針對(duì)小批量零件的清理工作，是有較好的實(shí)用價(jià)值和經(jīng)濟(jì)效益。 設(shè)計(jì)對(duì)象為總裝、彈丸循環(huán)及分離裝置、除塵器設(shè)計(jì)、提升斗。 本機(jī)利用帶有獨(dú)特的集塵裝置安裝地點(diǎn)不受車間同風(fēng)管路的限制衛(wèi)生條件好，本機(jī)設(shè)有自動(dòng)停車裝置，操作簡(jiǎn)便。 關(guān)鍵詞：型砂 氧化鐵皮 毛刺 螺旋 指導(dǎo)老師簽名： Shot Blasting Machine Drum and structural design of the overall Student name: Yang Ting Class: 0781053 Supervisor: Zhang XiaoRong Abstract: The drum-type shot blasting machine works by using high-speed rotation of the impeller within the projectile thrown constantly turning roller cone castings or forgings, to remove residual sand or the surface oxide skin, clean uniform, high efficiency, suitable for in small and medium casting and forging shop clean up small pieces to use to solve a small part of the clearance volume. The design process, using a slow drive roller chain drive and enhance the struggle of the rotation cycle of the experimental use of the projectile. In order to remove residual casting or forging the surface of sand or iron oxide with a high-speed rotation of the impeller Pillay will continue to turn within the projectile thrown to the drum parts. Required to achieve the following purposes: a comprehensive use of mechanical and electrical knowledge; b projectile design cycle and the separation device; c filter design; d shot cycle and separation equipment, dust collector parts of the design. Using a gear-driven shot blast wheel drum work, while the use of dry-type dedusting cyclone dust separation device work. Projectile loop device of roller retaining plate in between the spiral shell with a separate screen to upgrade the Big Dipper and composition. Firing projectiles thrown by the impeller workpiece, the roller retaining plate from the grid plate and the cylinder bore into the shell protecting the gap between the have, the use of screw rotation to enhance the role of flow within the bucket. Elevated to the top, through the separation screen deburring, nails, core bone, sand, grain and so on. Complete projectile shot by the import into the canal inside. Designed for small batch parts cleaning work, there is a good practical value and economic benefits. Design object for the assembly, projectile circulation and separation devices, filter design, promotion fight. This machine is used with a unique location from workshop dust collection equipment installed wind pipe with good sanitary conditions restrictions, this machine is equipped with automatic stop device, easy to operate. Keyword: moulding sand millscale burr helix Signature of Supervisor: 畢業(yè)設(shè)計(jì)（外文資料原文及其翻譯） 題目： 滾筒式拋丸清理機(jī)的總體和結(jié)構(gòu)設(shè)計(jì) 系 別 航空工程系 專業(yè)名稱 機(jī)械設(shè)計(jì)制造及其自動(dòng)化 班級(jí)學(xué)號(hào) 078105335 學(xué)生姓名 楊挺 指導(dǎo)教師 張曉榮 二O一一 年 6 月 南昌航空大學(xué)科技學(xué)院學(xué)士學(xué)位論文 外文翻譯原文 SHOT BLASTING MACHINES FOR THE BLASTING OF SHEET MILL ROLLS V. I. Meleshko, A. P. Kachailov, V. G. Boikov, V. L. Mazur, T. P, Kobka and I. I. Krivolapov At the present time~ much attention is being devoted to increasing the quality of rolled products, partieularly sheet. To a significant degree this depends upon the preparation of the roll surface. Many plants are engaged in improving the quality of working the roll surface in preparing them for rolling.This article was written by personnel from Zaporozhstal Plant, Magnetogorsk Metallurgical Combine, the Institute for Ferrous Metallurgy, Dnepropetrovsk, and Magnetogorsk Mining and Metallurgical Institute on this very real problem.. The surface microrelief, or roughness, of cold rolled constructional sheet has an influence on the mechanical and production properties of metal, and also on the finish quality of parts made from this sheet. The final surface microrelief of thin sheet steel is formed in a skin pass on work roils which have been given a rough finish with metal shot. Normally the rough surface finish on the work rolls of skin pass stands is produced in pneumatic and rotor shot blasting machines. Experience in their use has shownthat the pneumatic machines used in the country's steel plants do not fill the need for high quality blasting of roll surfaces. In 1969 the Institute for Ferrous Metallurgy, Dnepropetrovsk, did work on the SM-2 shot blasting machine in No. 1 Cold Roiling Mill of Zaprozhstal Plant, which revealed a number of shortcomings in its construction. To provide sheet with the surface roughness required by the specifications of Volga Automobile Plant (R a =0.8-1.6 g),the basic requirements for the design of shot blasting machines were determined, The machine must provide: 1. a constant shot size during operation, in other words, effective removal of shot of the specified size from worn shot; 2. the possibility of controlling air pressure in the collector of the shot blast machine during stable operations; 3. the handling of work rolls of different diameters (400-500 mm) without special equipment on the machine;; 4. simplicity in control and convenience in maintenance. Fig.1 The SM-2 machine (Fig. 1) consists of a stationary closed chamber ! with a trolley on wheels aad movab!enozzles 2~ which under the action of compressed air discharge shot on to the roll surface, a worm conveyor 8, an elevator with a separator 4, the shot blast equipment 5, and an exhaust system 6. The equipment is mounted on a special foundation 1905 mm below the floor level The length of the machine withthe trolley out is 15fl00 ram, the height 4070 ram, and the width 4600 mr~ The dimensions of the rolls handled are 400-500 mm in diameter and 2000-4000 mm in length. The total weight of the equipment is 15 tons. As research has shown, the dynamics of the wear of a working mixture of abrasive and the original condition of the shot changes during operation. During blasting, the shot takes on a wider size range and is worn down, forming many fine particles. The conditions under which the parts are blasted depend upon the size of the shot used. The contamination of the specified size by fine particles disrupts the process, producing a poor quality surface on the rolls and consequently on the sheet. To eliminate these problems it is necessary to either regularly measure the composition of the shot and make appropriate changes in the blasting sequence, which is difficult to do in practice, or to screen the shot during operation of the machine to provide the specified particle size. Stability in the blasting process is also determined by the quantity of shot delivered to the nozzles. It was experimentally established that supplying 0.3-0.4 kg/sec of shot to the two nozzles in operating with an air pressure of 2.5-4.0 atm provided stable operation. Equipping the machine with screening devices is an effective method for maintaining a constant shot size mix. This is confirmed both by data in the literature and by experience in the operation of SM-1 and TsKb_P-1 shot blast machines at Zaporozhstal Plant. The shot is delivered to the surface of the roll by the shot blast equipment, the chamber of which is divided by two diaphragms with charging vents into three compartments and is equipped with an electropneumatic control device. The working mixture from the upper compartment of the chamber drops to the lower and then to the collector. During operation of the machine,the vents are closed (turned on). The shot is poured in either after turning off the valves by the electropneumatic control device, or after shutting down the machine by the operator. When it is turned off, the vent descends, and between it and the diaphragm a circular gap 5 mm wide is formed. The vent is a cone with a slope of about 30% The shot drops slowly through this gap but not completely, and therefore it increases to t0 ram. The loading vents are alternately turned on by the control device. The first time the SM-2 machine was repaired, it was discovered that the control device frequently did not operate because of corrosion of the parts. With normal charging of abrasive (375 kg according to the nameplate), blasting must be stopped after each alternate pass of the nozzles, since after another pass the shot in the lower compartment is insufficient, and during blasting, With nonoperation of the control device, it does not drop from the upper compartment to the lower. Delivery of the nextportion of shot must be done only after the operator disconnects the shot blast equipment from the air system. In this case both charging vents are opened, and the abrasive is fed to the lower compartment. Continuous operation of the machine for three or four passes of the nozzles with nonoperation of the control device and the delivery of shot described above became possible after increasing the standard charge to 650 kg. However, the basic solution of this problem is stable operation of the control device. The used shot is collected by the collecting bunker of the working chamber and drops into the receiving chute of the worm conveyor. The plates parallel to the worm conveyor are at a greater angle, and those perpendicular are at less of an angle, which tends to collect shot on them. Therefore, after blasting one roll it is necessary to shut the machine down to push the accumulated shot on to the screw conveyor. To eliminate this shortcoming, it is possible to lengthen the screw conveyor, which is half the length of the working chamber. In addition, the smaller plate is removed completely,and the parallel plates are elongated to correspond with the length of the worm conveyor. The compressed air supplied to the collector of the shot blast equipment is dried by an oil moisture separator. However, this method of drying is inadequate. Water vapor condenses in the main line and in the shot blast equipment, and as a result shot sticks together in the lower compartment and forms a solid mass. The solid mass clogs the vertical channels along which the abrasive is transported to the collector and disrupts the optimum ratio of shot to air in the blast. This has a detrimental effect on the blasting process and the quality of the roll surface. The presence of moisture in the air causes corrosion of the equipment and causes operation of the pneumatic equipment of the machine to be poorer. Therefore, in designing shot blast equipment,it is necessary to specify equipment for drying the air. Foreign firms, for example, use special drying equipment utilizing water absorbing substances such as silica gel and activated alumina for drying compressed air. The mechanism for moving the nozzle has a number of shortcomings. Application of the jet of abrasive material on to the roll is through a nozzle mounted in an elbow shaped gun (Fig. 2). A shortcoming of the gun is the throttling of the mixture of compressed air and shot where the vertical and horizontal channels join. The junction is a right angle, which causes quick wearing away of the elbow. The cross sections of the channels and nozzle was increased. However, with an increase in the nozzle diameter from 10 to 12 mm (the allowable maximum) the consumption of air increased from 13 to 19 mS/h, which changed the ratio of shot to air in the blast. However, thisratio must be kept constant. Since during blasting it is difficult to make corrections, it was necessary ~o improve the design and increase the wear resistance of the parts. Fig.2 For this purpose a new design of blast guns, in which the diameter of the channels was increased (Fig. 2 b) and the shape of the transition from the channel to the channel and nozzle was changed, was proposed and tested, The new nozzle design is much more effective. After five months of operation,noticeable signs of wear in the elbowand nozzle have not been found, while the old design elbows wore out in a month. The blast guns are moved along the roll by a conveyor belt. Under the action of the weight of the troJ.ley and oscillations caused by its movement along the guides on which shot falling from the surface of the rolls accumulates, the belt gets out of alignment. As a result, the impact of the stream of shot on the surface is not at a right angle, but glancing, which produces a poorer surface quality. Placing a strip under the gun eliminated this problem, and the roll surface quality became satisfactory. In the first period of operation the compressed air tn the SM-2 machine was obtained from the shop main i',ine, which has a pressure of 6 atm. According to readings on a manometer placed before the collector of the shot btaat unit, the air pressure in it did not exceed 4.0 aim. With this pressure, even with the use of the finest shot (DChK-0.8), the roughness of the rolls is at the upper limit (R a = 2.7 #). Therefore, it was necessary to reduce the working pressure of the air. An air valve was used to control the pressure, but it was very sensitive to changes in air pressure, and operation of the shot blast machine was unstaSle. As a result, a reducing valve was placed between the oil moisture separator and the shot blast equipment. This made it possible to control the air pressure in the collector from 4.0 to 2.0 atm with an accuracy of 0.1 atrr. The use of this valve provides stable operation of the shot blast equipment. To blast rolls of different diameters it is necessary each time to change the position of the blast gun, which is not provided for in the design of the SM-2 machine. For example, at the present time to blast a 400 mm diameter roll after a 500 mm roll the machine must be shut down for adjustment. In designing new shot blast machines the possibility of changing the height of the gun must be specified. To observe the blasting process, special observation windows were cut in the long wal! of the lighted working chamber. Nonetheless, observation of the surface of the roll being blasted was difficult. Therefore, three additional 500 W lights, protected by louvers, were placed on the ceiling of the working chamber. Fig .3 Control of the machine (Fig. 3) is from the control panel 2, the valve 5 at the air line, the rheostats for con. trolling the speed of rotation of the roll and the movement of the nozzles, and the push bu~on for starting up the exhaust fan motor, which is behind the machine. Such an arrangement of the SM-2 shot blast machine equipment is not convenient for control The rheostats for controlling the speeds do not have graduated scales, which makes choice of the correct speed difficuR. Actual: 15 for each new position of the control handle it is necessary to determine the speed. These disadvantages must be eliminated in the design of new machines, It is also necessary to improve removal of accumulated metal dust from the horizontal portion of the exhaust line, which is in a difficult to reach location about 4 m above the floor tevel. To provide more convenient placement of the individual units of the shot blast machine and simplify i~maintenance, the Institute of Ferrous Metallurgy has developed and turned over to Zaporozhstal Plant recommendations which have been partially put into use on the existing machine and will be studied in designing similar new machines. The improvement in the SM-2 pneumatic shot blasting machine has made it easily possible to controt and maintain the specified sequence for blasting work rolls for cold rolling and skin pass sheet stands. As a result, Zaporozhstal Plant is mass producing cold roiled constructional sheet with a surface roughness meeting Ferrous Metallurgy Technical Specifications 1-683-69 and 1-686-69. 7