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幹研磨濕研磨抛光的基本原理-河北興創

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幹研磨濕研磨抛光的基本原理

发布时间：2020/2/28 16:00:23 来源：河北興創機械制造有限公司

干研磨，主要是嵌入研磨平板表面的砂粒起切削作用。当零件在研磨压力的作用下，在嵌有砂粒的研磨平板上相对滑动时，砂粒对被研磨表面的高点产生压缩作用，由于内应力的增大而产生弹性变形。当应力_过屈服点后，_进入塑性变形，晶粒和晶粒之间产生滑移，随着变形的增大，_后失去联系而破裂，这_是所谓的研屑。壓砂平板

幹研磨濕研磨抛光的基本原理

幹研磨，主要是嵌入研磨平板表面的砂粒起切削作用。當零件在研磨壓力的作用下，在嵌有砂粒的研磨平板上相對滑動時，砂粒對被研磨表面的高點産生壓縮作用，由于內應力的增大而産生彈性變形。當應力大過屈服點後，之後進入塑性變形，晶粒和晶粒之間産生滑移，隨著變形的增大，之後失去聯系而破裂，這便是所謂的研屑。研磨輔料的存在，改&善了切削條件，促進了研磨質量和效率的提高。當然，在切削作用的同時，還存在著其它一些輔助作用。如氧化膜的形成和去除；砂粒擠壓産生的塑性變形作用；摩擦和切削所起的熱熔作用，這些作用隨著磨料粒度的細化而增強。

濕研磨，由于不間斷的添加研磨劑，不但有新砂粒參加研削，而且砂粒的各個微刃變換切削，使各個鋒刃都發揮了作用，同時冷卻潤滑條件良好。隨著研磨劑中活化輔料的增加，化學作用和電化學作用也隨之增強。這是使之成爲高&效率研磨方法的主要原因。

抛光是一個_複雜的加工過程。研磨劑中品種繁多的活化物質大量增加，化學作用_活躍頻繁，磨料只起到破壞氧化膜的作用。同時，某些磨料的本身起著化學作用。如氧化鉻中的遊離硫磺蒸汽與金屬表面起化學作用，形成了一層很薄的強度很低的硫化膜，它對硬脂酸和氧化鉻起吸附作用。當零件與研具相對滑動時，吸附在零件表面的氧化鉻將高點的硫化膜破壞，重新露出新鮮的金屬，複而又形成硫化膜，這樣反複不斷的對零件的波峰進行光整加工。

由于研具用極軟的材料制成，砂粒在抛光過程中，往往存在于軟基體之中，因而在一&定範圍內，磨料的粒度對抛光效果影響不是很明顯。

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In the first place, the corner house was already marked as the scene of one unsolved tragedy. For years it had been shut up, for years the boys of the locality had challenged one another to go down the area steps after dark, for years nobody had crossed the threshold. Then the door had been left open for the public eye to look on another tragedy. In a café, lower down, near the canal I saw a number of German soldiers, and was successful in having a chat with the inn-keeper, at the farthest corner of the bar. I asked him, of course, what they meant by burning the village, and he told me that the Germans had made a number of unsuccessful attacks on Fort Pontisse, until at last they reduced it to silence. They were now so near that they could open the final assault. They were afraid, however, of some ambush, or underground mine, and the Friday before they had collected the population, whom they forced to march in front of them. When they had got quite near they dared not enter it yet, and drove the priest and twelve of the principal villagers before them. That is how Pontisse was conquered. CHAPTER X "'6. I am convinced that on the whole the treatment of the wounded was generous and exemplary. But it is also a fact that the terrible hatred of the Germans against the British, encouraged by their military authorities (one has to think of the proclamation of Prince Rupert of Bavaria) and their scandalous comic papers, which disgust even decent Germans, induce to extravagances such as I witnessed at Landen. Did not a German officer explain to an editor of the Algemeen Handelsolad (evening issue of October 18th): "The unwritten order is to make everywhere as many French and as few English prisoners as possible; we don't try to wound, but to kill the British."'" A survey of the Socratic philosophy would be incomplete without some comment on an element in the life of Socrates, which at first sight seems to lie altogether outside philosophy. There is no fact in his history more certain than that he believed himself to be constantly accompanied by a Daemonium, a divine voice often restraining him, even in trifling matters, but never prompting to positive action. That it was neither conscience in our sense of the word, nor a supposed familiar spirit, is now generally admitted. Even those who believe in the supernatural origin and authority of our moral feelings do not credit them with a power of divining the accidentally good or evil consequences which may attend on our most trivial and indifferent actions; while, on the other hand, those feelings have a positive no less than a negative161 function, which is exhibited whenever the performance of good deeds becomes a duty. That the Daemonium was not a personal attendant is proved by the invariable use of an indefinite neuter adjective to designate it. How the phenomenon itself should be explained is a question for professional pathologists. We have here to account for the interpretation put upon it by Socrates, and this, in our judgment, follows quite naturally from his characteristic mode of thought. That the gods should signify their pleasure by visible signs and public oracles was an experience familiar to every Greek. Socrates, conceiving God as a mind diffused through the whole universe, would look for traces of the Divine presence in his own mind, and would readily interpret any inward suggestion, not otherwise to be accounted for, as a manifestation of this all-pervading power. Why it should invariably appear under the form of a restraint is less obvious. The only explanation seems to be that, as a matter of fact, such mysterious feelings, whether the product of unconscious experience or not, do habitually operate as deterrents rather than as incentives. did I, that Amasai and Carrie got married last May? They are still He came at length, a little dapper man, with a slight hump between the shoulders, a nose slightly crooked on one side. He appeared to take his warm welcome quite as a matter of course, he discarded a pair of grey suède gloves, and called for a bottle of champagne. The fog was thinning under them, blowing aside, swirling, shifting. That supported his decision that neither a single robber nor a band of miscreants had planned the affair. They would have taken all the real stones, and he believed that these were numerous. "I put them in this here book," he said, "betwixt the leaves, and then I put the book under my saddle and set on it. I don't weigh so much, but it works all right," he added, looking up with a na?ve smile that reached from one big ear to the other. "To-morrow," he told him later, "I'm going to ride over here to Tucson again. What way might you be takin'?" The one man at bay whirled round twice, with a bullet in his heart and an arrow through his neck. "Now!" he made one fierce effort to cry, as he staggered again and dropped on his face, to be trampled under forty feet. Cope maintained the order of battle arranged the day previous, except that he turned the men's faces towards the east instead of the west, to meet the new position of the enemy. His infantry was posted in the centre; Hamilton's dragoons were on the left, and Gardiner's with the artillery in front, on the right, leaning on the morass. The Highlanders no sooner saw the enemy than, taking off their caps, they uttered a short prayer, and pulling their bonnets over their brows, they rushed forward in their separate clans with a yell that was frightful. "What are you foolin' with the ole hayseed for?" said another teamster, coming up behind Groundhog. "Slap the old hawbuck over, snatch up the kittle and run with it. I'll do it if you don't." And human nature, he knew with terror, was about to be overthrown once more. "Don't come any further." HoME 朴妮唛各部ENTER NUMBET 0019www.shenshou.net.cn
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