外文翻譯---普通全鋼沖模的沖壓精度分析

1、<p>　　General all-steel punching die’s punching accuracy</p><p>　　Accuracy of panel punching part is display the press accuracy of the die exactly. But the accuracy of any punching parts’ linear dimensi

2、on and positional accuracy almost depend on the blanking and blanking accuracy,. So that the compound mould of compound punching’s accuracy, is typicalness and representation in the majority.</p><p>　　Analys

3、e of the die’s accuracy</p><p>　　For the analyse of pracyicable inaccuracy during production of dies to inactivation, we could get the tendency when it is augmentation in most time. From this we could analys

4、e the elements. When the new punch dies pt into production to the first cutter grinding, the inaccuracy produced called initial error; if the die grinding more than twenty times, until it’s discard, the inaccuracy called

5、 conventional error; and before the dies discard, the largest error of the last batch permit, called limit</p><p>　　The initial error usually is the minimal through the whole life of die. Its magnitude depen

6、d on the accuracy of manufacture, quality, measure of the punching part, thickness of panel, magnitude of gap and degree of homogeneity. The accuracy of manufacture depend on the manufacture process. For the 1 mm thicked

7、 compound punching part made in medium steel, the experimental result and productive practice all prove that the burr of dies which produced by spark cutting are higher 25%~~30% than produc</p><p>　　The norm

8、al error of the punch die is the practicable error when the fist cutter grinding and the last cutter grinding before the die produce the last qualified product. As the increase of cutter grinding, caused the measure the

9、nature wear of the dies are gradual increasing, the error of punching part increase also, so the parts are blew proof. And the die will be unused. The hole on the part and inner because the measure of wear will be small

10、and small gradually, and its outside form will be la</p><p>　　The limit error in punching parts are the max dimension error which practicable allowed in the parts with limit error. This kind of parts usually

11、 are the last qualified products before the die discard.</p><p>　　For the all classes of dies, if we analyse the fluctuate, tendency of increase and decrease and law which appeared in the die’s whole life, w

12、e will find that the master of the error are changeless; the error that because the abrade of the cutter and impression will be as the cutter grinding times increased at the same time. And that will cause the error overs

13、ize gradually; and also have another part error are unconventional , unforeseen. Therefore, every die’ s error are composed of fixed error,</p><p>　　1. fixed error</p><p>　　At the whole process

14、when the New punching die between just input production to discard, the changeless master error that in qualified part are called fixed error. It’s magnitude is the deviation when the die production qualified products be

15、fore the first cutter grinding. Also is the initial error, but the die have initial punching accuracy at this time. Because of the abrade of parts, the die after grinding will be change the dimension error. And the incre

16、ment of deviation will oversize as the </p><p>　　(1) the material , sorts, structure, (form) dimension, and thick of panel</p><p>　　the magnitude of punching gap and degree of homogeneity are ha

17、ve a important effect for the dimension accuracy. Different punching process, material, thick of panel, have completely different gap and punching accuracy. A gear H62 which made in yellow brass with the same mode number

18、 m=0.34, 2mm thick and had a center hole, when the gap get C=0.5%t (single edge) , and punched with compound punching die, and the dimension accuracy reached IT7, the part have a flat surface ,the verticality of tangen&l

19、t;/p><p>　　(2) punching craft and molder structure type</p><p>　　Uses the different ramming craft, flushes a precision and the fixederror difference is really big. Except that the above piece geare

20、xample showed, the essence flushes the craft and ordinary punching flushes a precision and the fixed error differs outside a magnitude,even if inordinary punching center, uses the different gap punching, thefixed error d

21、ifference very is also big. For example material thickt=1.5mm H62 brass punching, selects C <= the 40%t unilateral I kind ofsmall gap punching compa</p><p>　　(3) the craft of punching die’s manufacture<

22、;/p><p>　　the main work of punching die namely are raised, the concave moldprocessing procedure, to operates on the specification not to behigh, can time form a more complex cavity. But its processing surfaceap

23、proximately is thick > 0.03 ~ 0.05mm is the high temperatureablation remaining furcated austenite organization, degree ofhardness may reach as high as HRC67 ~ 70, has the micro crack, easilywhen punching appears broke

24、 the cutter or flaking. The Italian CorradaCorporation''s related memoir called "th</p><p>　　With precisely rubs truncates the law manufacture punching die, specially makes the high accuracy, th

25、e high life punching die, such as: Thin material small gap compound punching die, multi- locations continuous type compound die and so on, has the size precision high, the work component smachined surface roughness Ra va

26、lue is small, the mold life higher characteristic. Its processing craft at present changed the electrical fire by the past ordinary engine bed rough machining spark cutting or the</p><p>　　(4) gap size and d

27、egree of homogeneity</p><p>　　the flange and other sheet forming sgene rally all must first punching (fall material) the plate to launch the semi finished materials, after also has the forming to fall the ma

28、terial, the incision obtains the single end product to flush. Therefore punching the work, including is commonly used punching hole, the margin, cut side and so on, regarding each kind of sheet pressing partall is necess

29、ary. Therefore punching the gap to flushes a out form in chprecision to have the decisive influence. pu</p><p>　　(5) ramming equipment elastic deformation In the ramming process</p><p>　　After t

30、he punch press load bearing can have the certain elastic deformation. Although this kind of distortion quantity according to flushes the pressure the size to change also to have the obvious directivity, but on the pressi

31、ng part, mainly is to has the volume ramming archery target stamping, embosses, the equalization, the pressure is raised, the wave, flushes crowds, the shape, the flange, hits flatly, thinly changes draw ability and so o

32、n the craft work punching forming flushes, has the si</p><p>　　普通全鋼沖模的沖壓精度分析</p><p>　　板料沖壓件的精度準確顯示出其沖模的沖壓精度。而任何沖件的線性尺寸精度與形位精度主要取決于沖模沖裁和立體成形沖壓件展開平毛坯的落料精度。因此，多工步復合沖壓的單工位復合模、多工位連續(xù)模的沖壓精度，在普通沖壓的眾多種類與

33、不同結(jié)構(gòu)的沖模中，最具典型性和代表性。沖模的沖壓精度分析 對沖模投產(chǎn)至失效報廢各個時期沖件的實際誤差分析，可以看出其增大的時期及趨向，從而分析其增大的因素。新沖模投產(chǎn)至第一次刃磨前沖制沖件的誤差即所謂的初始誤差；沖模經(jīng)過20次左右刃磨至失效報廢前沖制的沖件誤差稱之為常規(guī)誤差；而沖模失效報廢前沖制的最后一批合格沖件的允許最大誤差稱之為極限誤差。在現(xiàn)場，確定沖模刃磨壽命的依據(jù)是沖件沖孔與落料的毛刺高度。由于任何成形件都具有沖裁作