手机看片1204免费人一级

<form id=RYmMGSbBf><nobr id=RYmMGSbBf></nobr></form>

<address id=RYmMGSbBf><nobr id=RYmMGSbBf><nobr id=RYmMGSbBf></nobr></nobr></address>

?

高頻淬火熱處理的介紹

车毂高频淬火处理

? ? 3 高频淬火试验

外齿轮高频淬火表面硬度要求为46～56HRC；硬化层深度要求≥110MM，硬化特性曲线应基本符合要求。 ? ? ?零件原材料的调质处理

? ? 试验用进口零件材料为两种组织形态，一种是符合欧宝公司要求的珠光体型可锻铸铁，其原始组织为粒状珠光体＋呈较细团絮状且均匀分布的石墨，无游离渗碳体。另一种为铸造后调质状态，原始组织为回火索氏体＋呈较细团絮状且均匀分布的石墨，基体硬度为22～24HRC。两种材料均符合高频感应淬火工艺对其组织的要求。

? ? 在生产中未经调质的可锻铸铁的原始组织为珠光体＋铁素体（珠光体含量为50％～80％），经过高频瞬时加热后容易造成有效硬化层深度分布不均匀，导致表面硬度值高低不均，若要达到高硬度，采取提高淬火温度往往会使铸件产生裂纹。因此，要求对铸件毛坯进行调质处理，得到均匀的回火索氏体，再经高频感应淬火后便能得到均匀的马氏体组织和均匀的表面硬度及硬化层深度。

標簽: 高頻淬火技術

Related Products

?

AN OLD SETTLER. AN OLD SETTLER. "Of course, you know where the Dutchman is to be found?" "I am afraid I was as foolish as that," Bruce said, with a faint smile. "That sort of people seem to know when one is under the weather. And there was one very plausible fellow who sent me a confidential letter. I fell into the trap, and if I can't find ￡500 tomorrow I am ruined." "I believe that it is my duty to take that task upon me, assisted by some well-known burgesses, who have undertaken to stand by me. 72 When people in Parisian society thought of the country, they thought of lambs with ribbons round their necks, shepherdesses in fanciful costumes with long crooks, or a “rosière” kneeling before the family and friends of the seigneur to be crowned with flowers and presented with a rose as the reward of virtue, in the presence of an admiring crowd of villagers; of conventional gardens, clipped trees, and artificial ruins; but wild, picturesque mountain scenery was their abhorrence. She must have tossed the life preserver from the stern. Nothing else explained its employment. From the air, to an observer who had no idea that his craft had been used, all should seem natural, Larry decided as he and Dick, with Sandy’s discarded garments, and with the caretaker ruefully grumbling, chose a place of concealment. She smiled. "The chances that she will marry are excellent." Arizona had its full share of murder and sudden death. But New Mexico had more than that. Spring passed on there, with warmth for the snow-wrapped mountains, and blistering heat for the dead plains, and her way was marked with lifeless and mutilated forms. Chapter 24 "Deer Bat: Got yore $100 all right, but doant send by that "Rose, marry me." "Unhappy woman!" said the monk, in a tone that seemed to encourage her to proceed—"what would you of me?" "Roland de Boteler, do you intend to submit?—but you have not a mother's feelings!" "These knaves wish to carry things with a strong hand, my liege," said the Earl of Oxford, bending his knee as he presented the scroll. HoME 手机看片1204免费人一级ENTER NUMBET 002amsvc.com.cn
www.jiuhaoxue.com.cn
yufa99.net.cn
www.jiancaiok.com.cn
womenfuk.cn
www.lishuis.cn
kuming.org.cn
www.mamlbvxw.cn
www.tudiji.cn
www.iishome.cn