CN104117747B - 电子封装外壳引线焊接方法 - Google Patents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
- B23K35/0244—Powders, particles or spheres; Preforms made therefrom
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/85—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
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- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
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- Manufacturing Of Electrical Connectors (AREA)
Abstract
本发明涉及焊接方法,具体为电子封装外壳引线焊接方法,先将焊料烧结成焊料球,再将引线装入引线模具中,焊料球在引线的钉头上,烧结形成钉头带焊料的钎焊引线;将钎焊引线与电子封装外壳的壳体一起装入焊接模具中固定,壳体在下面,钎焊引线带有焊料的钉头朝下放在壳体上;烧结炉随玻璃烧结,形成钎焊。本发明提供的电子封装外壳引线焊接方法,先将焊料制作成焊料球,通过网筛控制焊料球的大小,使焊料量基本一致,提高焊接合格率;焊料堆放在引线钉头与壳体之间,减少了焊料的使用量,降低成本。这种端头带焊料的钎焊引线,使焊料与引线成为一个整体,便于自动化组装,提高生产效率。
Description
技术领域
本发明涉及焊接方法,具体为电子封装外壳引线焊接方法。
背景技术
根据机械工业出版社2010年05月1日出版的《高级电子封装(原书第2版)》(张辉,郭志川等著)第1章中的“1.3.3封装盖和引脚密封5”描述,电子封装外壳的接地引线钎焊方法过程为,首先要将焊料丝制成焊料环,将焊料环套到引线上,引线与壳体一起装入焊接模具中固定,壳体在最底下,引线由重力作用落在壳体上,引线的钉头外表面紧靠壳体平面,焊料环由重力作用落在引线钉头内表面,将焊接模具烧结炉高温钎焊,焊料环熔化,焊料沿引线流入引线钉头与壳体的接触面完成焊接。这种钎焊方法,是人工将焊料丝制成焊料环,焊料环直径大小不一,钎焊处焊料少时钎焊不牢固,焊料多时影响外观,造成合格率低;并且整个引线的钉头部包裹焊料,银铜焊料的使用量较大,成本高;同时人工将焊料环套在引线上,再装入焊接模具,不易实现装配自动化,效率低。
发明内容
针对上述技术问题,本发明提供一种节约焊料、并能实现自动化的引线焊接方法,具体的技术方案为:
电子封装外壳引线焊接方法,包括以下步骤:
(1)焊料球制备,在焊料球模具的沉孔内填满焊料粉,所述的焊料球模具为石墨制成,上表面有多个沉孔,沉孔为锥形或半球形;
(2)焊料球模具放入烧结炉中烧结,焊料粉熔融后由表面张力自然形成焊料球;
(3)从焊料球模具中取出烧结成的焊料球,根据要求,用不同目数的网筛进行筛选不同粒径的焊料球;
(4)将引线装入引线模具中,所述的引线模具包括多个通孔,通孔顶部有端面沉孔;引线穿入通孔内,引线的钉头卡在端面沉孔内,再将焊料球装入端面沉孔内,焊料球在引线的钉头上;
(5)将装好引线与焊料球的引线模具放入烧结炉中烧结,使焊料球熔融后连接在引线的钉头上,形成钉头带焊料的钎焊引线;
(6)将钎焊引线与电子封装外壳的壳体一起装入焊接模具中固定,壳体在下面,钎焊引线带有焊料的钉头朝下放在壳体上;
(7)将焊接模具放入烧结炉随玻璃烧结,形成钎焊。
本发明提供的电子封装外壳引线焊接方法,先将焊料制作成焊料球,通过网筛控制焊料球的大小,使焊料量基本一致,提高焊接合格率;焊料堆放在引线钉头与壳体之间,减少了焊料的使用量,降低成本。这种端头带焊料的钎焊引线,使焊料与引线成为一个整体,便于自动化组装,提高生产效率。
附图说明
图1是本发明的焊料球模具结构示意图;
图2是本发明的引线模具结构示意图;
图3是本发明的钎焊引线与电子封装外壳连接示意图。
具体实施方式
结合附图说明本发明的具体实施方式,电子封装外壳引线焊接方法,包括以下步骤:
(1)焊料球制备,在焊料球模具1的沉孔11内填满焊料粉,如图1所示,所述的焊料球模具1为石墨制成,上表面有多个沉孔11,沉孔11为锥形或半球形;
(2)焊料球模具1放入烧结炉中烧结,焊料粉熔融后由表面张力自然形成焊料球;烧结温度为800~1000℃,并有保护气保护;
(3)从焊料球模具中取出烧结成的焊料球,根据要求,用不同目数的网筛进行筛选不同粒径的焊料球;
(4)如图2所示,将引线3通过振动方式装入引线模具2中,所述的引线模具2包括多个通孔,通孔顶部有端面沉孔;引线3穿入通孔内,引线3的钉头卡在端面沉孔内,在引线模具2上表面倒上焊料球,引线模具2来回倾斜并轻振动,使得焊料球4逐个装入端面沉孔内,焊料球4在引线3的钉头上;
(5)将装好引线3与焊料球4的引线模具2放入烧结炉中烧结,烧结温度为800~1000℃,并有保护气保护;使焊料球4熔融后连接在引线3的钉头上,形成钉头带焊料的钎焊引线34;
(6)将钎焊引线34与电子封装外壳的壳体5一起装入焊接模具中固定,壳体5在下面,钎焊引线34带有焊料的钉头朝下放在壳体上;
(7)将焊接模具放入烧结炉随玻璃烧结,形成钎焊。
Claims (1)
1.电子封装外壳引线焊接方法,其特征在于:包括以下步骤:
(1)焊料球制备,在焊料球模具的沉孔内填满焊料粉,所述的焊料球模具为石墨制成,上表面有多个沉孔,沉孔为锥形或半球形;
(2)焊料球模具放入烧结炉中烧结,焊料粉熔融后由表面张力自然形成焊料球;
(3)从焊料球模具中取出烧结成的焊料球,根据要求,用不同目数的网筛进行筛选不同粒径的焊料球;
(4)将引线装入引线模具中,所述的引线模具包括多个通孔,通孔顶部有端面沉孔;引线穿入通孔内,引线的钉头卡在端面沉孔内,再将焊料球装入端面沉孔内,焊料球在引线的钉头上;
(5)将装好引线与焊料球的引线模具放入烧结炉中烧结,使焊料球熔融后连接在引线的钉头上,形成钉头带焊料的钎焊引线;
(6)将钎焊引线与电子封装外壳的壳体一起装入焊接模具中固定,壳体在下面,钎焊引线带有焊料的钉头朝下放在壳体上;
(7)将焊接模具放入烧结炉随玻璃烧结,形成钎焊。
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CA3037872A1 (en) * | 2016-09-22 | 2018-03-29 | Lucas-Milhaupt, Inc. | Braze bonded nail head lead |
CN106475556B (zh) * | 2016-11-06 | 2018-07-17 | 合肥圣达电子科技实业有限公司 | 一种使用石墨模具烧结微波金属封装外壳的方法 |
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US6295730B1 (en) * | 1999-09-02 | 2001-10-02 | Micron Technology, Inc. | Method and apparatus for forming metal contacts on a substrate |
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TWI229931B (en) * | 2002-05-15 | 2005-03-21 | Amkor Technology Inc | Solder ball and conductive wire for a semiconductor package, and its manufacturing method, and its evaporation method |
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CN202067607U (zh) * | 2011-04-29 | 2011-12-07 | 宜兴市吉泰电子有限公司 | 一种金属外壳用变径引线夹具 |
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