CN106381443B - 白铁铆钉及其制造工艺 - Google Patents
白铁铆钉及其制造工艺 Download PDFInfo
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 85
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 8
- 229910052802 copper Inorganic materials 0.000 claims abstract description 9
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000001953 recrystallisation Methods 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 4
- 229910052759 nickel Inorganic materials 0.000 claims abstract description 4
- 238000007747 plating Methods 0.000 claims abstract description 4
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 10
- 238000000137 annealing Methods 0.000 claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 238000005554 pickling Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims 1
- 239000011574 phosphorus Substances 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 7
- 239000010949 copper Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 229910001220 stainless steel Inorganic materials 0.000 description 4
- 239000010935 stainless steel Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 241001079814 Symphyotrichum pilosum Species 0.000 description 3
- 235000004224 Typha angustifolia Nutrition 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000011889 copper foil Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- -1 recess Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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Abstract
本发明公开一种白铁铆钉，其各元素按质量百分比组成为：Fe≥85％、Si 0.3％‑0.5％、Cu 2.4％‑3.2％、Mg 1.2％‑1.8％、Zn 0.1％‑0.2％、Mn 0.15％‑0.25％、Ti 0.1％‑0.3％、P 0.01％‑0.03％、S 0.01％‑0.05％，其余为不可避免的杂质。一种如上述白铁铆钉的制造工艺，其步骤包括：选料‑酸洗‑磷化‑冷拔‑再结晶退火‑精拨‑冷镦‑镀镍或者镀锌。
Description
技术领域
本发明涉及铆钉加工制作技术领域，尤其涉及一种白铁铆钉及其制造工艺。
背景技术
铆钉是最常用的紧固件之一，用于预期不拆卸的结构连接。一般由钉头、钉杆两部分组成，钉杆的末端是形成铆成头的部分，为了便于铆钉插入铆钉孔中，钉杆末端一般设计成倒圆或倒角。
铆钉有些是铜的，有些是不锈钢做的，PCB线路板在压合叠板时会进行铆合，压合后铆钉就会直接残留在板内。铜铆钉硬度较软，硬度在80HV-115HV之间，在铆合过程中抓合力不够、大量掉屑，会导致压合后成品的层偏、短路报废较高现象无法解决，导致良率差。不锈钢铆钉的硬度太硬，硬度在180HV-230HV之间，容易损伤开花模具，会产生较多的屑，导致压合后产品出现刺破铜箔、凹陷、钢板变形、短路等报废较高的现象，导致良率差。
发明内容
本发明要解决的技术问题就在于：针对现有技术存在的技术问题，本发明提供一种硬度高、抓合力强的白铁铆钉。
为解决上述技术问题，本发明提出的技术方案为：
一种白铁铆钉，其各元素按质量百分比组成为：Fe≥85％、Si 0.3％-0.5％、Cu2.4％-3.2％、Mg 1.2％-1.8％、Zn 0.1％-0.2％、Mn 0.15％-0.25％、Ti 0.1％-0.3％、P0.01％-0.03％、S 0.01％-0.05％，其余为不可避免的杂质。
一种如上述白铁铆钉的制造工艺，其步骤包括：
(1)选取质量百分比中Fe≥85％的铁板；
(2)在常温下，用体积比为20％-80％的硫酸溶液对铁板进行酸洗；
(3)将酸洗后的铁板浸入温度在50℃-75℃由Fe(H2PO4)2、Mn(H2PO4)2、Zn(H2PO4)2组成的酸性稀水溶液中进行磷化，酸性稀水溶液的PH值为1-3，溶液相对密度为1.05-1.10，磷化时间为5-15分钟；
(4)将磷化后的铁板进行烘干，然后进行冷拔；
(5)冷拔后的铁板在450℃-500℃进行再结晶退火，退火时间为40-60分钟；
(6)再结晶退火后的铁板进行精拨；
(7)将步骤(6)处理后的铁板用多工位冷镦机挤压成型；
(8)成型后的铆钉进行表面镀镍或者镀锌处理。
上述步骤中，优选的，所述步骤(1)中，铁板的厚度为0.1mm-.0.25mm。
与现有技术相比，本发明的优点在于：
本发明的白铁铆钉及其制造工艺，制造出的白铁铆钉硬度在90HV-135HV之间，介于铜铆钉跟不锈钢铆钉之间，具有优良的抓合力，铆合时掉屑少，避免了损伤开花模具导致的刺破铜箔、凹陷、钢板变形、掉屑等问题，有效的解决了线路板在压合制程中出现的短路、层偏等报废现象，良率得到很大的提升。
附图说明
图1是本发明白铁铆钉一种实施例的结构示意图。
图例说明：
1、铆体；2、通孔。
具体实施方式
以下结合附图对本发明的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本发明，并不用于限制本发明。
为了便于描述，在这里可以使用空间相对术语，如“在……之上”、“在……上方”、“在……上表面”、“上面的”等，用来描述如在图中所示的一个器件或特征与其他器件或特征的空间位置关系。应当理解的是，空间相对术语旨在包含除了器件在图中所描述的方位之外的在使用或操作中的不同方位。例如，如果附图中的器件被倒置，则描述为“在其他器件或构造上方”或“在其他器件或构造之上”的器件之后将被定位为“在其他器件或构造下方”或“在其他器件或构造之下”。因而，示例性术语“在……上方”可以包括“在……上方”和“在……下方”两种方位。该器件也可以其他不同方式定位(旋转90度或处于其他方位)，并且对这里所使用的空间相对描述作出相应解释。
如图1所示，本发明的一种白铁铆钉的实施方式，其各元素按质量百分比组成为：Fe 87％、Si 0.4％、Cu 2.8％、Mg 1.6％、Zn 0.15％、Mn 0.20％、Ti 0.2％、P 0.02％、S0.03％，其余为不可避免的杂质。
上述白铁铆钉的制造工艺，其步骤包括：
(1)选取厚度为0.2mm，含Fe质量百分比达到87％的铁板；
(2)在常温下，用体积比为60％的硫酸溶液对铁板进行酸洗；
(3)将酸洗后的铁板浸入温度在60℃由Fe(H2PO4)2、Mn(H2PO4)2、Zn(H2PO4)2组成的酸性稀水溶液中进行磷化，酸性稀水溶液的PH值为2，溶液相对密度为1.05，磷化时间为10分钟；
(4)将磷化后的铁板进行烘干，然后进行冷拔；
(5)冷拔后的铁板在450℃进行再结晶退火，退火时间为45分钟，冷却；
(6)再结晶退火后的铁板进行精拨；
(7)将步骤(6)处理后的铁板用多工位冷镦机挤压成型；
(8)成型后的铆钉进行表面镀镍或者镀锌处理。
制成的铆钉硬度达到110HV，具有优良的抓合力，铆合时与铜铆钉相比掉屑量要减少80％以上，与不锈钢铆钉相比掉屑量减少70％以上。用于PCB线路板压合制程时，铆合后线路板的层偏率与铜铆钉相比减少65％以上，与不锈钢铆钉相比减少55％以上。
上述只是本发明的较佳实施例，并非对本发明作任何形式上的限制。虽然本发明已以较佳实施例揭露如上，然而并非用以限定本发明。因此，凡是未脱离本发明技术方案的内容，依据本发明技术实质对以上实施例所做的任何简单修改、等同变化及修饰，均应落在本发明技术方案保护的范围内。
Claims (1)
1.一种白铁铆钉，其特征在于，其各元素按质量百分比组成为：Fe≥85％、Si 0.3-0.5％、Cu 2.4％-3.2％、Mg 1.2％-1.8％、Zn 0.1％-0.2％、Mn 0.15％-0.25％、Ti 0.1％-0.3％、P 0.01％-0.03％、S 0.01％-0.05％，其余为不可避免的杂质；
所述的白铁铆钉，其制造工艺步骤包括：
(1)选取质量百分比中Fe≥85％的铁板；
(2)在常温下，用体积比为20％-80％的硫酸溶液对铁板进行酸洗；
(3)将酸洗后的铁板浸入温度在50℃-75℃由Fe(H2PO4)2、Mn(H2PO4)2、Zn(H2PO4)2组成的酸性稀水溶液中进行磷化，酸性稀水溶液的PH值为1-3，溶液相对密度为1.05-1.10，磷化时间为5-15分钟；
(4)将磷化后的铁板进行烘干，然后进行冷拔；
(5)冷拔后的铁板在450℃-500℃进行再结晶退火，退火时间为40-60分钟；
(6)再结晶退火后的铁板进行精拨；
(7)将步骤(6)处理后的铁板用多工位冷镦机挤压成型；
(8)成型后的铆钉进行表面镀镍或者镀锌处理；
所述步骤(1)中，选取厚度为0.1mm-0.25mm的铁板。
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