Rapid prototyping technology changed the traditional pattern of product design, which could offer product sample for the designer, reduced design cycle and quicken the schedule of new product design, and it gave the decision - makers visual feeling. ; rp technology provided kinds of molds including resin - boncled mold laminate mold, investment mold and lost foam casting mold and so on for sand casting investment casting and cavityless casting, it could also use direct shell production casting to make pattern dies metal dies die - casting dies injection dies directly, and it could even produce casting products in small scales. the applications of fdm technology in plaster precision casting and the rapid casting technology based on sls technology were introduced, the organic combination between rapid prototyping tecnnology and foundry process, which initiated a new period of rapid manufacturing metal parts, by using advanced new technology alternated traditional foundry industry to make it looked brand - new, thus, the competition of foundry industry would be improved ; rapid prototyping technology offered a rapid economical feasible technical method, common processes of using rapid prototyping technology to produce dies were discussed, in the paper it explored that. the problem of combining rapid prototyping technology with electric arc metal - spraying technology to make metal dies and technics in dies manufacturing of combining rapid prototyping technology with precision casting, rapid tooling based on rapid prototyping, integrated advanced new technology and tradition technology of rapid prototyping manufacture, each superiority were exerted, rapid prototyping technology had been an efficiency measure to rapid update products and develop new product, and to middle -
快速成型技術改變了傳統的產品開發模式,可以為設計者提供產品樣件,縮
短設計周期,加快新產品的開發進度,為決策者提供直觀性;快速成型技術迅速提供砂型鑄造、熔模鑄造、實型鑄造用的各種模樣,包括樹脂模、層壓模、熔模和消失模等,還可採用直接制
殼鑄造法直接製造熔模鑄造用的壓型、金屬型、壓鑄型、注塑模,甚至直接製造小批量鑄件,介紹了熔積成型技術在石膏型精密鑄造上的應用和基於選擇性激光燒結技術的快速鑄造技術,快速成型技術與鑄造工藝的有機結合,開創了快速製造金屬零件的新階段,對用高新技術改造傳統的鑄造工業,使其面貌煥然一新,增強鑄造行業的競爭能力;快速成型技術為母模的製造提供了一條快速、經濟、可行的技術途徑,討論了利用快速成型技術製造模具的一般工藝方法,探討了將快速成型技術與金屬電弧噴鍍技術結合起來快速製造金屬模具問題,以及快速成型技術與精密鑄造技術相結合的模具製造工藝,基於快速成型製造的快速模具技術,集成了快速成型製造高新技術和傳統技術,發揮各自優勢,已成為產品快速更新換代和新產品開發及中、小批量生產的有效手段之一。
Crustal shortening of tian shan is centered in foreland depression, but we also think about shortened length of intermont area
天山的地
殼縮
短量主要集中在天山山前坳陷中,但也要考慮天山山間活動構造的貢獻量。
This incubation adjustment of parents makes the synchrony in hatching and the hatching intervals of nestlings shorter than the laying intervals of eggs. this phenomenon was perhaps resulted from the incubating behavior difference of parents in laying time and incubating time. the research also found that the growth rate and survival rate in the latest hatched nestlings in little egret were lower than the earlier hatched ones
卵的孵化時間與產卵順序呈負相關性,先產的卵比后產的卵所需孵化時間相對較長,此現象產生是由於親鳥在產卵期和產卵后的孵化行為不一致造成的,這種孵化調節使同一窩雛鳥孵出時間具有相對集中的趨勢,雛鳥出
殼的時間間隔比產卵的時間間隔
短;另一方面,在白鷺雛鳥的生長過程中,最晚出
殼的雛鳥生長水平和成活率明顯落後于早出
殼的雛鳥,而池鷺由於窩卵數和窩雛數為5的數量相對較少,雛鳥生長均衡。
The heat supplying system adopts the imported sus316 plate type heat exchanger, with the heat transferring coefficient 3 times bigger than the shell & tube type exchanger, facilitating the system to reach to required working temperature in shorter time
換熱系統選用進呂sus316板式換熱器,其傳熱系數為
殼管式換熱器的三倍以上,能在較
短時間內達到所需的工作溫度。
Conectors, electrical, circular, bayonnet coupling. operating temperature 175 degrees celsius continuous duty. short shell
航空器材.連續使用溫度175
短殼體旋插式連接的圓形電連接器
The highest chl content and the highest photosynthesis rate of hull of a whole panicle were about 25 % and 20 % of those of flag leaf. ( 2 ) the absorption spectra of chl was different between flag leaf and hull, the absorbance of the medium that contain chl of hull was more strong than that of flag leaf in zone of short wavelength when the chl concentration of medium was the same. ( 3 ) the weight of the hull increased gradually after heading, the weight of the hull in the upper part of the panicle is higher than in the lower part of the panicle
谷
殼與旗葉相同葉綠素濃度提取液的光吸收光譜特性不同,在
短波區谷
殼葉綠素提取液的光吸收明顯比旗葉葉綠素的高;在抽穗后,谷
殼的重量會有所增加,但穗下部谷
殼的重量始終比穗上部的輕;相關分析表明,谷
殼的重量與最終粒重呈極顯著正相關關系。
If the shelling time is too long or too short, it will be hard to control core - making technology and can cause wasted product of casting
如果結
殼時間太長或太
短,都會使得制芯工藝難于控制,進一步造成鑄件的廢品。
Apart from the symposium, the exercise this year will consist of a static display of aircraft by the participating units, display of mountain rescue equipment by the cas, a short range joint mountain and sea rescue demonstration at hau hok wan, and a long range exercise in the south china sea area
今年除了有研討會外,還會有參與單位之飛機預展、民眾安全服務處的攀山拯救設備展覽、在鱟
殼灣舉行的
短程野外及海上拯救聯合示範,以及在南中國海舉行的長程演習。
Connecting point for earthing and short circuiting devices ; shell fixing point for phase conductors
接地的接點和
短路設備.相導線用外
殼的固定接點
In a relatively short time ( about 1000 years ) the entire shells will be ejected into space, joining the gas and dust in the interstellar medium
在相對較
短的一段時間里(大約1000年)整個
殼層將被拋入太空,加入到星際介質的氣體和塵埃中。
A short range joint mountain and sea rescue demonstration organised by the civil aviation department was successfully held at hau hok wan, lantau island today ( wednesday )
由民航處統籌的一項
短程野外及海上拯救聯合示範今日(星期三)于大嶼山鱟
殼灣順利舉行。
I adopts rubber as insulation material including power cable, operating temperature is between - 30c and 180c. good heat conducting ability the tight connection of conducting band and crankcase can ensure high conduction efficiency
電加熱帶線緊貼在壓縮機曲軸箱外
殼,通電即可產生熱能直接進行導熱,熱效應高,可
短時加熱達到效果。
Application of plain - plate in the structures of short leg walls
平板
殼單元及其在
短肢墻結構中的應用
With the rapid development of space geodetic techniques at recent 20 years, the new space geodetic data and new analytical techniques inaugurate the new route to monitor and study crustal motion and dynamicvariety of global tectonic plate in this paper we present the current characteristics of global tectonic plate in short time scale and crustal deformations of regions mainly based on gps data ( incorporating few data of vlbi and slr )
隨著近二十多年空間大地測量技術的迅猛發展,開辟了監測和研究地殼運動和全球構造動態變化新途徑。本文主要利用gps資料(附加少量的vlbi和slr資料) ,研究較短時間尺度全球板塊構造現今運動特徵和區域性地殼形變。