【正文】 in manufacturing in molding tools. 4, the technical application in CAM of the molding tool process to imitate true and manufacturingThe calculator assistance manufacturing( CAM) technique of the molding tool applies primarily in the aspects of counting to control amp。190。171。247。190。175。187。 .Because the molding tool sprinkles to note or burn the knot with the steel powder but,Material and mon molding tool steel contain certain margin, therefore, the life span is shorter, cans make to manufacture on a trial basis product or small batch quantities , taking shape the technique quickly can also manufacture the special spare parts,If make with the metallurgy powder legal system the metals electrode, nicety cast the legal system makes the copper electrode, 209。247。 or sprinkle the admixture that note in soft mold chemistry contain steel powder glue knot,Proceed to burn to bee the steel shape the steel mold of the technique manufacturing quickly to process after needing further did to throw light etc., make into the small batch quantity produce of note the mold of 203。219。204。187。247。214。187。 of the product transform etc..The molding tool passes the CAD the design with analyze, can dissolve mistake at design the stage, increase to try once the mold the success the plastics molding tool design with analyze to apply many new puteraideds technique this stage, if the parameter turns technique, haracteristic shape technique, database technique etc..There is many standards piece in the plastics molding tool,Turn such as the standard mold a parameter for outing organization, sprinkling noting system, cooling system...etc. can adopting basing on database managing the characteristic shape design method proceed the design or establish the standard a 191。 whether to exsit product construction absurdity or molding tool constructions or not is not reasonable, appearing the product 179。220。190。187。It is every kind of need that the external appearance of the product exaggerate that product of the result designs, making product more beautiful, the color can attract people more。s are several why the sketch draws is to make use of the flat surface CAD software draw the spare parts sketch, then replace the handicraft painting with the calculator。 curved face shape design, free shape in space design, the external appearance of the product exaggerates, product of dynamic advertise to design the etc..These softwareses contain many typical the software of 206。s turn the design of the sketch, three 206。 ,According to the product three 206。 a traditional product design method is a design to product of three 206。 The molding tool CAD gathers the technique Contents brief summary: Pass to analyze the calculator the assistance inject the mold design with make in the each link monly shared of technique with information, this text announces to public to inject the mold CAD gathers technical and basic content, and the research heat that put forward it orders with trend. preface The molding tool CAD gathers the technique is an important molding tool forerunner manufacturing technique, is the item reforms with the high technique traditional technical and important key in molding tool technique. From 6 5 plan beginning,Our country contain many molding tools business enterprise adoption CAD technique, especially recent years, the technical application in CAD is more and more widespread with thorough, shortened consumedly molding tool design period,Increases to make the mold quantity with the manufacturing ability that plicated molding , gather to the molding tool CAD because of many business enterprises technique cognition shortage, investment take the blindness, can39。另外 , 快速成形技術(shù)也可以制作特殊的零件 ,如用冶金粉末法制作金屬電極、精密鑄造法制作銅電極、研模法制作石墨電極等。其它方法也在某些特種加工中得到應(yīng)用。這一技術(shù)稱為快速自動成形技術(shù) (Rapid Prototype)。在高級 CAD/CAM一體化系統(tǒng)中 (如 UGII、 PRO/E),由于利用了參數(shù)化特征造型設(shè)計和同一數(shù)據(jù)庫技術(shù) , 使得產(chǎn)品模型數(shù)據(jù)、模具的型腔和型芯模型數(shù)據(jù)、刀具軌跡數(shù)據(jù)有著內(nèi)在的聯(lián)系 , 產(chǎn)品模型的修改刀具軌跡亦自動修改。塑料模具中有許多標準件 , 如標準模架、頂出機構(gòu)、澆注系 統(tǒng)、冷卻系統(tǒng)等都可以采用基于數(shù)據(jù)庫管理的參數(shù)化特征造型設(shè)計方法進行設(shè)計或建立標準件庫 , 這樣既可以實現(xiàn)數(shù)據(jù)共享 ,又可以滿足用戶對設(shè)計的隨時修改 , 使模具的設(shè)計分析快速、準確、高效。確定了這些設(shè)計數(shù)據(jù)以后 , 再利用模具分析軟件 , 如 MOLDFLOW、 CFLOW進行塑料的成形過程分析。這一方式可極大提高新產(chǎn)品設(shè)計速率。二維幾何圖形的繪制是利用平面 CAD軟件繪制零件圖形 , 即用計算機代替手工繪圖 。電腦塑件產(chǎn)品模型的來源有三種 : 利用 CAD系 . Rao and K. Sivaram: J. Mater. Proc. Technol., 1993, vol. 37, . 統(tǒng)軟件進行產(chǎn)品模型設(shè)計、利用實物測量進行快速反求建模、利用其它 CAD系統(tǒng)的標準格式文件。本文就塑料模具 CAD集成技術(shù)及其應(yīng)用發(fā)表一些觀點 , 供大家參考。然而 , 由于許多企業(yè)對模具 CAD集成技術(shù)認識不足 , 投資 帶有盲目性 , 不能很好地發(fā)揮作用 ,造成了很大的浪費。這種方法使產(chǎn)品模型設(shè)計、模具結(jié)構(gòu)設(shè)計、加工編程及工藝設(shè)計都以 3D數(shù)據(jù)為基礎(chǔ) , 實現(xiàn)數(shù)據(jù)共享 , 不僅能快速提高設(shè)計效率 , 而且能保證質(zhì)量 , 降低成本。 產(chǎn)品自由造型及廣告設(shè)計的軟件有 :Alias、CDRS等。其基本原理是通過三座標測量機、激光測量機或電子抄數(shù)儀對實物進行掃描測量 , 把測量所獲得的數(shù)字化的大量數(shù)據(jù)點送入高級 CAD軟件的反求模塊或?qū)Ｓ玫姆辞筌浖?, 反求軟件可直接讀取點數(shù)據(jù)群 , 并可對點數(shù)據(jù)群進行編輯、過濾、整理、求精、排序、局部修改與重組 , 然后自動生成曲面 , 最終獲得同實物精確一致的或經(jīng)改造的電腦塑件產(chǎn)品模型。利用先進的特征造型軟件如 PRO/E、 UGII等很容易地確定分型面 , 生成上下模腔和模芯 , 再進行流道、澆口以及冷卻水管的布置等。在塑料模具設(shè)計和分析這一階段應(yīng)用了許多新的電腦輔助技術(shù) ,如參數(shù)化技術(shù)、特征造型技術(shù)、數(shù)據(jù)庫技術(shù)等。較多的專業(yè)電腦編程軟件如 MASTERCAM、 UNIMOD、 CIMATRON 等在多曲面的編程加工時對產(chǎn)品的曲面模型有較高的要求 ,如相鄰曲面的 U、 V方向的一致性、曲面與曲面的高精度擬合、曲面斜率連續(xù)變化等。 其成形原理是將三維 CAD實體模型離散成設(shè)定厚度的一系列片層數(shù)據(jù) , 利用激光成形機或 其它成形設(shè)備讀取這些數(shù)據(jù) ,用材料添加法技術(shù) ,依次將每層堆積起來成形。 SLS法是用激光進行燒結(jié) ,采用的材料較廣 ,如塑料、蠟料、陶瓷、金屬等均可成形 , 成形件耐熱、耐負荷和著色能力較強 ,具有廣泛的應(yīng)用前景。由于模具是用鋼粉澆注或燒結(jié)而成 , 材質(zhì)與普通模具鋼有一定的差距 , 因此 , 壽命較短 ,只能做試制產(chǎn)品或小批量生產(chǎn)。在模具的設(shè)計制造方面 ,含有豐富專家知