Disigning coolant channel on the firebox of liquid rocket engine to loxodrome ( equal - angle helix ) groove can improve firebox coolant capability greatly. because the width dimension of loxodrome groove is narrow and the depth is deep, some machining methods are incapable, such as end - milling or electrochemistry. according to the peculiarities, a cnc disk - cutter - milling method which is composed of five motion axes with four simultaneously interpolated ones is researched. because most firebox generatrix is composed of complex curves, it is very difficult to get cnc cutting program with manual means. in order to deal with the problem, the loxodrome mathematics model is studied, and an auto - programming software system is developed. the software system can generate cnc cutting program of loxodrome on many kinds of turned surface. the constriction - distension segment of firebox is the most representative workpiece. the sharp changing of its generatrix slope makes loxodrome milling difficult. with the theory analyzing and practice cutting experiment, some applied techniques, which include milling mode and direction, choosing cutter diameter and cutting start point setting, are developed. adopting the technology above, tens regular workpiece have been manufacturing. the two - year manufacture practice has confirmed the validity and feasibility of developed loxodrome coolant channel milling method. the developed technology is also worth to be referenced to other similar workpiece
將液體火箭發動機燃燒
室的冷卻通道設計為斜航線(等傾角螺旋線)槽形,可以大幅度改善燃燒
室的冷卻性能.斜航線冷卻槽的槽寬尺寸較小而槽深尺寸較大,所以無法使用棒銑
刀銑削、電化學等加工方式.針對這些特點,提出了五軸控制、四軸聯動的數控片銑
刀銑削加工方法.由於燃燒
室外表面的母線輪廓復雜,手工編制數控加工程序難度大.為了解決數控加工程序的編制問題,研究了斜航線的數學模型,開發了自動編程軟體系統.使用該系統,可以生成多種母線輪廓回轉體外表面上的斜航線數控加工程序.燃燒
室收斂-擴張段的母線斜率變化大,加工難度大,是斜航線冷卻通道加工的最典型工件.經過理論分析和實際切削實驗,研究了針對該類型工件的片銑
刀直徑選擇、銑削方式和方向、
刀具調整和起
刀點的設置等多項實際的加工方案.採用上述的一系列技術,已經成功地加工了數十個合格工件.經過兩年多的實際生產過程應用,驗證了所開發的斜航線冷卻通道加工方法的正確性和可行性.這些加工技術的研製成功,對其他相似類型零件的加工亦具有參考意義
Outside the sword will bereave, and inside terror both young man and virgin, the nursling with the man of gray hair
申32 : 25外頭有
刀劍、內
室有驚恐、使人喪亡、使少男、童女、吃奶的、白發的、盡都滅絕。
After i woke up, the surgery was over and i was resting in the recovery room. however, i felt as if it had only taken a few minutes. that was how master helped me face the surgery without worry and fear
待我醒來時,
刀已經開完了,我躺在恢復
室休息,可是卻覺得好像才短短幾分鐘而已,師父就這樣讓我無憂無懼度過了開
刀日!
Director of sichuan gamma scalpel therapeutic center
四川伽瑪
刀中心治療
室主任
After which harrowing dnouement sufficient to appal the stoutest he snapped the blade to and stowed the weapon in question away as before in his chamber of horrors, otherwise pocket
隨后,他啪的一聲插
刀入鞘,將這把利器收進他那恐怖
室91也即是衣兜里。
But there are no report of the design and research on bionic adhesion decreasing efficiency of the standard disk plow that has a great difference to other soil touched component on working manner and force support status currently. in this paper, standard disk plow was selected to be research object. with disk plow referred as bionic components and the theory of soil touched component adhesion decreasing and resistance reducing applied, we modified its shape and promoted its property
本文選擇標準型圓盤犁作為試驗研究對象,以圓盤犁
刀為具體的仿生設計部件,運用觸土部件減粘脫土理論,在仿生表面改性、改形研究以及傳統圓盤犁
刀結構基礎上,首先對圓盤犁
刀進行了若干種仿生非光滑結構不同組合設計,繼而製作了兩組試驗用仿生圓盤犁
刀,最後對設計加工的仿生圓盤犁
刀,分別進行了正交試驗設計和二次回歸試驗設計,在
室內土槽中進行了研究條件下的耕作試驗。
Take a good look and you ll notice that the cold cabbage hearts are all perfectly cut, and that the tofu skin and the sesame - paste grilled bread are handmade by the chef. even the pickled cabbage for the boiled pork hotpot, so popular during winter, is made using only the best white cabbage, and when added to the traditional copper pot of boiling broth it seems to suffuse the room with warmth
放眼店內,涼拌白菜心的
刀工整,素拉皮與芝麻醬燒都是師傅自製,連冬天熱賣的酸菜白肉鍋,也在大白菜材料上精挑細選,腌漬出酸脆而不嗆鼻的北方酸白菜,在傳統大銅鍋上煮出一
室的溫暖。
Shave pins in all bedrooms
所有臥
室備有刮臉
刀脫發器插頭
This machine is of vertical crushing structure, and the material is fed into the crushing chambezr through a hopper, crushed by simultaneous cutting of both fixed and movable knives and rotating impact of rotating knife, and entered into the catcher automatically under the effect of rotating centrifugal force, and the dust is filtered and recovered by dust collector through a bag
本機為立式粉碎結構,物料由進料斗進入粉碎
室,利用旋轉
刀的旋轉沖擊,固定
刀和活動
刀同進剪切而獲得粉碎,粉碎好的物料經旋轉離心力的作用,自動進入捕集袋,粉塵由吸塵箱經布袋過濾回收。
At the door of the ante - room appeared the figure of bagration, without his hat or sword, which, in accordance with the club custom, he had left with the hall porter
巴格拉季翁在接待
室門口出現了,他沒有戴上軍帽,也沒有佩帶單
刀,按照俱樂部的慣例,他把這些東西存放在閽者那裡了。
The valet, joseph, gave anatole his knapsack and sword, and they all went out into the vestibule
僕人約瑟夫把手提包和馬
刀遞給阿納托利,大家走進接待
室。
Additionally the oldest patient cured 92, and youngest, 6 years old epilepsy. the director, duan guangyuan, graduated from shanghai military medicine university with years of clinical experience in three - dimensional directional irradiation therapy ; deputy director and vice chief physician luo guanghua, engaged in neurosurgery field and with rich experience, published lots of articles at key national journals. the center retains 4 experts : professor zhang zhenjun from beijing recovery center imaging branch, professor liao xiaoping, director of internal nerve and vice president of hainan provincial hospital ; professor zhu guangyi, pundit of facial feature in hainan province and associate professor chen xianzhao, an expert in irradiation field in hainan province
該中心成立於1999年6月,聘請神經外科耳鼻喉科放療科等科
室專家來中心坐診,臨床治療由一批經驗豐富的副高以上職稱的神經外科醫生擔任,開業以來共收治患者數千例,治療病種多達20餘種,其中病人最大年92歲垂體瘤,最小年1 . 2歲鼻咽部血管纖維瘤,通過對治療后的病人隨訪,發現伽瑪
刀具有療效顯著,安全,副作用少等特點。
This machine of horizotal crushing structure, and the material is fed into the crushing chamber through a hopper, crushed by cutting and impact of both fixed and rotating knives, and flows to the exit automatically under the effect of rotating centrifugal force
料斗進入粉碎
室,利用旋轉
刀與固定
刀沖擊、剪切而獲得粉碎,經旋轉離心力的作用,物料自動流向粉碎機出口處。
There were 180 directors and satraps from department of tumor, liver and gall, breathing and gynecology inside and outside of the province attending the ceremony and academic seminar. experts kang jingbo and zhang liping from beijing air force general hospital gamma knife center delivered a report in the meeting
出席開業典禮及學術報告會的有來自省內各院的腫瘤科肝膽科胸外科呼吸科婦科等相關科
室的主任及學科帶頭人,約人,會中北京海軍總院澳海體部伽瑪
刀中心康靜波張麗萍專家做了學術報告。
Introduced at the same time is a new stationery series containing a letter opener, a memo holder and a tape dispenser, which are made of black and silver metal bearing hongkong post logo printed in silk screen
一併推出的產品包括開信刀、便條紙座和膠紙座。這些文具以黑色和銀色金屬製造,並以絲網印刷香港郵政的標志,是辦公室的理想用品。