中國英文翻譯

1、 中英文翻譯畢業(yè)設(shè)計（論文）外文摘要CAE technology in injection mold design application The mold design's process is generally this: Receives the plastic products chart from user there (possibly is two-dimensional, also possibly is three dimensional), mold project engineer according to the product type, the chara

2、cteristic as well as the shape considered that uses the appropriate structure to carry on the design, what mold structure namely uses to be possible to take shape this plastic. During this process, structural design engineer must unify own experience according to product certain specific requests to

3、 choose the flow channel type, the size, the runner type, quantity, the size, the position and determined that a divergence quantity, the size and so on, guaranteed designs mold besides structure in reasonable, is pouring and the cooling system aspect is also feasible. is obvious, the mold design re

4、garding the structural design engineer's request is very harsh. He not only need have the structural design experience, but must have the formation material, formation craft aspect many knowledge, or, the design success or failure relies on to a great extent the mold designer's experience. E

5、ven if a project engineer has the very good mold design experience, but he still faced many new questions, because the actual product often is ever changing. Sometimes a slight change or the specific product request possibly enable to have the experience not available, or, even if available, but bef

6、ore actual experimental mold, is also unable to carry on the effective confirmation. This caused the mold design process to have the obvious design - - revision - - re-engineering characteristic. How to reduce in this process the cycle-index, causes result which the reference design should achieve o

7、r approach comes in handy, this has the important meaning in reality. the CAE analysis solves the above question ideal tool. The reason is, this tool establishment above relatively accurate mathematical model foundation, thus may obtain the actual instruction production practice approximately the re

8、sult, in addition, the computation quick causes before the actual experimental mold, may carries on the appraisal regarding many gating systems and the cooling system until the optimization, thus achieves the reduction design and the manufacturing cycle, improves the quality the goal. this article s

9、everal questions which, the procedure pays attention on the CAE analysis in makes some to introduce that and gives some instances to carry on the explanation.1） is clear about the analysis request and key. The different product, carries on the CAE analysis the goal is different. Regarding the outwar

10、d appearance, does not allow to present the influence outward appearance on the surface the injection molding flaw, like nodulizing mark and so on; Regarding the non-outward appearance, the agglutination mark's position is unimportant, but if the product has the strict assembly relations, then p

11、ermits the warp and the amount of deformity become the pursue the essential target. In addition, all products request to be able generally to satisfy the balanced flowing, the even packing request. In the practice, simultaneously satisfies many kinds of requests is difficult, in the most situations

12、is by satisfies a main request primarily, under the premise, satisfies other request again. Therefore in is clear about the analysis request in the foundation, but also which can divide to be clear is this analysis overriding demand.After having determined the analysis request and key, but must reco

13、gnize initially which parameters the revision or does change. For example, affects the nodulizing mark position the primary factor is the runner position and the product shape characteristic, but the product shape does not permit the change generally; The influence warp and the amount of deformity f

14、actor is mainly the product shape, looked from the craft angle, the injection pressure oversized, guarantees presses the time to be excessively long and to cool non-uniform may cause the warp aberration to be oversized. Besides the product structure's characteristic, the runner, flow channel'

15、;s size may the immediate influence to the die space in injection pressure, cool canal's size and the arrangement situation immediate influence to the cooling level of uniformity. These factors indirectly affected the product distortion and the warp.(2) analysis product structure characteristic.

16、 Uses the specialized CAE analysis software to carry on the injection molding flowing simulation, must first carry on the geometry modelling, generally speaking, this process needs to spend the very long time. Therefore, must make the suitable degree to the geometric model the simplification to redu

17、ce the modelling time, raises the counting yield. At present, some CAE software already had from the specialized CAD software the direct input full-scale mockup, uses in this software the specific neutral surface extraction tool extraction neutral surface to carry on the computation again the functi

18、on, but the goods in process structure is more complex time will have many questions. Therefore, simplified to the computed result influence not remarkable detail still had the very big significance. simplifies the method may the different function which provides according to the specialized softwar

19、e carry on. The simplified principle is the slight structure which and the entire product's criterion compares may neglect, is far from the runner or may also neglect mutually with the material class direction parallel detail. As for the grid division, the best basis product's different stru

20、cture, uses the different criterion in the different region the grid, obtains the computational accuracy high result, when computation warp and distortion especially so. (3) selects the appropriate injection molding material. The CAE analysis result's credible degree is decided by three aspects:

21、 First, when computation uses molten state fluid mathematical model accurate degree how; Second, computing time geometric model with actual product difference size; Third, uses the injection molding material's data originates to be whether accurate, be reliable. Generally speaking, the error whi

22、ch comes by the mathematical model is acceptable in reality, the commercialization CAE analysis software many year practice test has proven this point. The practice proved that so long as makes the suitable simplification according to the model simplification principle to the model, then brings to t

23、he counting error is also acceptable from this. On the contrary, if the material data which uses is inaccurate, even if the geometric model precise degree is again high, then the computed result is also far from. Therefore, must be clear about product material name which, trademark, the production m

24、anufacturer even production batch the user selects. Actual, the homogeneous material production batch brings differently the data error is may neglect, the different manufacturer production's homogeneous material as a result of aspect and so on formula, craft differences, its material data possi

25、ble difference to be very big. The homogeneous material different trademark's data phase difference should be bigger. present, the overseas commercialization's CAE analysis software has established the certain amount material database, but nearly does not involve the homemade materials. Obvi

26、ously, uses the overseas material data to carry on the computation only to be able to obtain the quite sketchy computed result. Therefore has the condition user, may act according to own product characteristic, screens some commonly used materials to carry on the changing parameter experiment, based

27、 on this may obtain the CAE analysis input parameter, establishes suits this enterprise's commonly used material database.(4) analysis result analysis and appraisal. The analysis result's appraisal must certainly the joint analysis the specific request to carry on. Namely whether to have ach

28、ieved this analysis essential target, if has not achieved must seek the new plan according to the analogue result, including adjusts certain parameters, the position and so on, then carries on the new simulation again. Before seeking the new gating system, the cooling system plan, certainly must ana

29、lyze the improvement plan carefully or revise any parameter only then to be possible to cause the computed result gradually close analysis request, but is not the deviation analysis goal. wants certainly the overall evaluation regarding computed result's appraisal, because the final analogue res

30、ult often is many kinds of condition compromises, namely the computed result possibility “is better, not best”. This request engineers and technicians have a comprehensive balance regarding the analysis result. For instance, in satisfies the mobile equilibrium under the premise, injection pressure b

31、ig somewhat, this also will possibly bring some questions. So long as but such injection pressure will not have brought the high shear rate or other injection aspect flaw, then may think that this plan will be comes in handy, this time might finish the analysis. Certainly, under the adequate time pr

32、emise, carried on the CAE analysis to many plans regarding to seek for a more appropriate solution is as far as possible best. The analysis and the evaluation exercise should better the analysis staffs handle jointly with structural design engineer by CAE, cast the workshop experienced craft personn

33、el to carry on.(5) understands the CAE analysis correctly in the mold design function. Injection molding mobile CAE the analysis may help engineer to carry on the appraisal beforehand to many possibility plans, thus obtains the relatively good gating system plan and the cooling system plan. But, can

34、not expect that the computed result and the actual situation tally are very good, the reason is when carries on the analog computation, by the material data brings erroneous, the error which as well as the error which brings by the computation mathematical model brings by the geometric model simplif

35、ication causes the computed result with the actual injection molding process existence certain extent difference, this kind of difference increases along with the above error obviously increases. In addition the actual injection process's complexity, causes to obtain the definite analysis result

36、 to be more difficult. if the material data is accurate, the model simplification is appropriate, obtains the quite credible analysis result is completely possible. This time uses the data which obtains to take the instruction actual production the craft data is also meaningful.Who finally speaks to

37、 make the CAE analysis the question. CAE analysis, because involves the material, the injection molding craft, mathematics, the computer and so on many science, therefore to analyzes engineer's overall quality to have certain request. The experience indicated that CAE the analysis staffs should

38、better by have high polymer material discipline background engineer to hold the post. 畢業(yè)設(shè)計（論文）中文摘要 CAE技術(shù)在注塑模具設(shè)計中的應(yīng)用模具設(shè)計的過程一般是這樣的：從用戶那里接到塑料制品圖(可能是二維的，也可能是三維的)，模具設(shè)計工程師根據(jù)產(chǎn)品的類型、特點以及形狀考慮采用合適的結(jié)構(gòu)進(jìn)行設(shè)計，即采用什么樣的模具結(jié)構(gòu)可以成型出該塑料件。在此過程中，結(jié)構(gòu)設(shè)計工程師還要根據(jù)制品的某些特定要求結(jié)合自己的經(jīng)驗選擇流道類型、尺寸，澆口類型、數(shù)量、尺寸、位置并確定分流道的數(shù)量、尺寸等，以保證所設(shè)計的模具除了

39、結(jié)構(gòu)上合理外，在澆注和冷卻系統(tǒng)方面也是可行的。 顯然，模具設(shè)計對于結(jié)構(gòu)設(shè)計工程師的要求是十分苛刻的。他不僅要具有結(jié)構(gòu)設(shè)計的經(jīng)驗，還要具有成型材料、成型工藝方面的諸多知識，或者說，設(shè)計的成敗在很大程度上依賴于模具設(shè)計者的經(jīng)驗。即使一個設(shè)計工程師具有很好的模具設(shè)計經(jīng)驗，但是他仍然面臨許多新的問題，因為實際中的產(chǎn)品往往是千變?nèi)f化的。有時候一個細(xì)微的變化或者特定的產(chǎn)品要求可能使得已有經(jīng)驗不可用，或者即使可用但在實際試模之前，也無法進(jìn)行有效的驗證。這導(dǎo)致了模具設(shè)計過程具有明顯的設(shè)計修正再設(shè)計的特點。如何減少該過程中的循環(huán)次數(shù)，使初始設(shè)計應(yīng)達(dá)到或者逼近合用的結(jié)果，這在實踐中具有重要意義。 CAE分析正是解

40、決上述問題的理想工具。原因是，該工具建立在相對準(zhǔn)確的數(shù)學(xué)模型基礎(chǔ)之上，從而可以近似獲得實際指導(dǎo)生產(chǎn)實踐的結(jié)果，此外，計算的快捷性使得在實際試模前，可以對于多個澆注系統(tǒng)和冷卻系統(tǒng)進(jìn)行評估直至優(yōu)化，從而達(dá)到縮短設(shè)計和制造周期，提高質(zhì)量的目的。 本文就CAE分析中注意的幾個問題、做法作一些介紹，并給出一些事例進(jìn)行說明。 (1) 明確分析要求和重點。不同的制品，進(jìn)行CAE分析的目的是不同的。對于外觀件，不允許在表面上出現(xiàn)影響外觀的注塑缺陷，如熔結(jié)痕等；對于非外觀件，燒結(jié)痕的位置并不重要，但是如果制品具有嚴(yán)格的裝配關(guān)系，則允許的翹曲和變形量成為追求的主要目標(biāo)。此外，所有的制品一般都要求能夠滿足平衡流動、

41、均勻填充的要求。實踐中，同時滿足多種要求是困難的，多數(shù)情況下是以滿足一個主要的要求為主，在此前提下，再滿足別的要求。因此在明確分析要求的基礎(chǔ)上，還要分清楚哪些是本次分析的主要要求。 確定了分析的要求和重點后，還要初步認(rèn)定修改或者變動哪些參數(shù)。比如說，影響熔結(jié)痕位置的主要因素是澆口的位置和制品的形狀特點，而制品的形狀一般是不允許變動的；影響翹曲和變形量的因素則主要是制品的形狀，從工藝的角度看，注射壓力過大、保壓時間過長和冷卻不均勻都可以導(dǎo)致翹曲變型過大。除了制品結(jié)構(gòu)本身的特點外，澆口、流道的尺寸都可以直接影響到型腔內(nèi)的注射壓力，冷卻水道的尺寸和布置情況則直接影響到冷卻的均勻程度。這些因素又間接地

42、影響到了制品的變形和翹曲。 (2) 分析制品結(jié)構(gòu)的特點。使用專業(yè)的CAE分析軟件進(jìn)行注塑流動模擬，首先都要進(jìn)行幾何建模，一般來說，這一過程要花費很長的時間。為此，要對幾何模型作適當(dāng)程度的簡化以縮短建模時間，提高計算效率。目前，一些CAE軟件已經(jīng)具有從專業(yè)化的CAD軟件中直接輸入實體模型，再使用該軟件中特定的中性面抽取工具提取中性面進(jìn)行計算的功能，但是在制品的結(jié)構(gòu)較為復(fù)雜時會產(chǎn)生諸多問題。因此，簡化對計算結(jié)果影響不顯著的細(xì)節(jié)仍然具有很大的意義。 簡化的方法可以根據(jù)專業(yè)化軟件提供的不同功能進(jìn)行。簡化的原則是與整個制品的尺度相比較可以忽略的細(xì)微結(jié)構(gòu)，距離澆口較遠(yuǎn)或與料流方向相互平行的細(xì)節(jié)也可以忽略。至于網(wǎng)格的劃分，最好根據(jù)制品的不同結(jié)構(gòu)，在不同的區(qū)域采用不同尺度的網(wǎng)格，以獲得計算精度較高的