欧美色图片玖玖视频

<form id=nPsduEOFY><nobr id=nPsduEOFY></nobr></form>

<address id=nPsduEOFY><nobr id=nPsduEOFY><nobr id=nPsduEOFY></nobr></nobr></address>

中文English

超聲波焊接原理

超聲波焊接理論特點-振動與傳導

不變的超聲波熔接理論基礎，就有模具架設原則的共通點。然而超聲波熔接原理到底如何？

相信大家都知道在寒冷的天氣裏，將手掌摩擦會有熱的感覺，摩擦的速度越快溫度也愈高，這種由速度與介質摩擦，所産生的溫度成爲正比。在超聲波的速度與塑料的振動摩擦中，亦産生高于材質熔點的溫度，然而這個高于材質熔點的溫度並非自然産生，而是經由一系列作用而來。是先産生電源訊號給由振蕩子結合換能器的振動系統，發出15000~20000次/秒振動頻率，此時如用手去接觸，可感覺溫度約爲60~80℃(視超聲波塑焊機器輸出功率大小)，而塑料熔點如ABS至少也有120℃左右，當然此種溫度是無法熔接的，所以我們必須裝上能量擴大器即超聲波專用模具(HORN)，使溫度擴大1~4倍(視塑料熔點與材質特性而定)。然而我們會發現超聲波上模，爲何一般會設計成底部大徑與端面小徑狀？

这正如我们小时玩水管，把出水端挤成小孔，水会变强且喷的更远。这就是扩大集束原理。此时再配合气压等动力源进行塑料熔接，超声波熔接理论就是如此。当然如何将超声波速度(频率)与塑料材质(介质)，摩擦产生的温度(振幅)，导引入我们的塑料産品，使之成为我们所需求的，这门学问分为三类，就是模具制造，模具架设技巧与熔接加工条件设定。而这些技术就是依据超声波熔接理论的特点振动与传导所做为设计基础。

氣壓大小對超聲波焊接的影響

超声波焊接后産品出现变形扭曲，不止这一个原因！

‘Oh, yes, you could. Now do just as I tell you, Alice. When you’ve eaten, we’ll talk again.’ "Not a sign of a sign! And yet I'll swear it! Do you know where she's gone?" "Go along with your doctor," said Maitrank now, in great good humour. "If you will have the goodness to call a cab I will get back to my hotel." "I am...." “Bad news?” Larry asked, climbing to the turf. Larry braced himself against the slap of the wheels into the surface water. That might offer just enough resistance to nose them in. However, it ended, as soon as Mr. Everdail had sailed on the yacht to join his wife at their lakeside camp in Maine, uncanny light, odd noises and other strange things had become evident again, as an excited local correspondent had notified the paper. Reporters, searching, and watching, had found nothing so far but the public would be informed as soon as they discovered the secret. He believed that he had no ties now, that friendships, the love of woman, and the kiss of children all had missed him, and that his, thenceforth, must be but vain regret. So far as he knew, Felipa had gone away without ever having received his letter. The man he had intrusted it to had been killed in the Aravaypa Ca?on: that he was certain of; and it never entered his head that his papers might have fallen into other hands, and the note have finally been delivered to her. She was leading the sort of life that would most quickly put him entirely out of her mind. He was taking the Washington papers, and he knew. She had gone away, not even sure that he had given her a thought since the night in the Sierra Blanca when Black River had roared through the stillness, and they had been alone in all the wild world. What a weird, mysterious, unearthly scene it had been, quite outside the probabilities of anything he had imagined or contemplated for a single minute. He had never regretted it, though. He believed in impulses, particularly his own. Yet she not only loved Cairness as much as ever, but more. Her church had the strong hold of superstition upon her, but she might have thrown it off, grown reckless of enforced conventions, and have gone to him, had not faithfulness and gratitude held her yet more powerfully. "Yes, that is she; glad to see you back, Missy," said the General, patting the cow on the back. "Take her back and give her a good feed, if you can find it, for probably she's pretty hungry." Have you never heard of AMP burning them, you silly damn fool? Her young face bowed to his neck, and suddenly his lips crept round and lay against the coolness of her cheek. She did not move, and he still walked on, the grass splashing under his feet, the rabbits scampering round him, showing their little cotton-tails in the dark. HoME 欧美色图片玖玖视频ENTER NUMBET 0046vg.com.cn
www.gdf15.com.cn
forwashop.com.cn
nyweb.org.cn
qiangsheng.org.cn
www.mtscn.com.cn
zv990.com.cn
ltg7.com.cn
dongqiao.org.cn
www.58927.com.cn