TSXP47425 

石墨銀漿也叫輔助陰極，起到二氧化錳與焊錫連接的橋梁作用。原瓶石墨濃度在10%左右，實(shí)際使用時(shí)調(diào)制到4 。 5%左右為宜，如果太稀的話，因?yàn)槭臐B透性很好，很容易往上爬，爬到上端面如果與鉭絲接觸，就會(huì)造成短路、漏電流大等情況，這種情況在當(dāng)時(shí)還檢測(cè)不出來(lái)，在點(diǎn)焊后鉭絲跟部受力，點(diǎn)焊檢測(cè)漏電流時(shí)合格率就相當(dāng)?shù)?，老化時(shí)擊穿非常嚴(yán)重。如果石墨太濃，石墨層和二氧化錳在做猛石墨時(shí)易分層，在后道包封、固化受到熱引力作用，石墨層和二氧化錳層之間產(chǎn)生層間剝離，造成損耗增加。

要注意石墨的PH值必須大于9。

銀漿也是同樣的道理，太稀的話，浸漬的時(shí)候很好浸，但是在浸焊的時(shí)候，銀層很容易被焊錫吞蝕掉，如果過(guò)濃，銀層和石墨的接觸不是太好，易造成接觸電阻大，并且浸漬時(shí)產(chǎn)生拉絲。有采用浸兩次銀漿的廠家銀漿和石墨使用前一定要按工藝要求滾勻。

切割的質(zhì)量往往被人們忽略。刀口的鋒利程度、間隙、沖下來(lái)時(shí)的速度都會(huì)對(duì)漏電有影響。我們有因?yàn)榍懈钯|(zhì)量不好導(dǎo)致10%的漏電大的試驗(yàn)結(jié)果。

2.7 點(diǎn)焊

焊點(diǎn)離根部越遠(yuǎn)越好，這樣對(duì)根部氧化膜的破壞就越小。點(diǎn)焊位置、手勢(shì)要正確，點(diǎn)焊浸焊的位置決定與包封后的外觀關(guān)系很大。

點(diǎn)焊后抽測(cè)漏電流合格率的信息很重要，作為工藝技術(shù)員一定要去經(jīng)常關(guān)心檢測(cè)信息，如果發(fā)現(xiàn)不正，一定要追查原因，不然后面的質(zhì)量無(wú)法控制，雖然該批產(chǎn)品已無(wú)法挽回了，但是，被膜流過(guò)的一段時(shí)間內(nèi)會(huì)出現(xiàn)同樣的問(wèn)題。

經(jīng)常有可能出現(xiàn)的問(wèn)題：

a）鉭絲切割太短？焊點(diǎn)太靠近根部？點(diǎn)焊電壓開(kāi)得太高，鉭絲過(guò)融了？

b）是否鉭絲臟？是硅膠沒(méi)涂好？上端面有硅膠？上端面強(qiáng)化層太??？組架尺寸不符合要求？鋼片變形？模具磨損？

c）石墨爬到端面上去了？強(qiáng)化層疏散導(dǎo)致石墨很容易往上爬？

d）切刀有問(wèn)題？

問(wèn)題要一查到底，只有查清了問(wèn)題，才能制定糾正和預(yù)防措施。

TSXP47425 
Siemens Simatic S7 TP177B Panel 6AV6642-0BC01-1AX0 NEU

Siemens Simodrive 611 6SN1118-0AE11-0AA0 Ver. B

Fanuc Graphic / M/07A Board A16B-2200-0350 

Siemens S5 CPU926 6ES5926-3SA12 6ES5-926-3SA12 

Bosch Servo Drive Modul DM 4K1101-D DM 4K-1101-D 7A

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Taktomat Scheibenkurven Schrittgetriebe XP 50 3-210°

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INDRAMAT AC-Servo Controller TDM-1.2-50-300-W1 

INDRAMAT Eco Drive DKC03.3-040-7-FW DKC-03.3-040-7-FW 

Siemens Simatic S5 WF721E 6FM1721-3AA20 WF721 TOP

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