干货 | 塑胶件紧固工艺之六:振动焊接
振动焊接是基于摩擦焊接的原理,两个塑胶件被压紧,其中一个塑胶件以一定的频率和振幅振动,使其相对另一个塑胶件做往复位移,从而产生摩擦热和剪切热使得焊接面达到充分熔融状态,在保压下冷却并固化,其连接处强度相当于与本体强度。![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1698155294009_miaopo.jpg?imageView2/0)
阶段3:熔融稳当阶段,熔融物的溢出量与生成量处于平衡状态;![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1698155303857_a4lyo0.jpg?imageView2/0)
振动焊接的优点是:
- 对于受潮(需干燥处理)与含高量添加物(高达45%)之塑料有良好的焊接效果;对于焊接表面的污染和杂质具有很高的容忍度。
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振动焊接和超声波焊接都依靠振动产生热能而使两个塑胶件紧固成一体,这常常会让人误以为是同一种焊接方式;其实,二者存在本质区别。
焊接方向的不同
超声波焊接:垂直于(或近似垂直于)塑胶件的焊接面;![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1698155293269_3wmkst.jpg?imageView2/0)
振动频率的不同
振动焊接:每秒钟120~140次,即120~140赫兹超声波焊接:每秒钟20,000~40,000次,即20~40千赫兹![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1698155296155_mwqqae.jpg?imageView2/0)
振幅的不同
振动焊接:高频振动0.4~1.8mm,低频振动1.8~4.0mm![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1698155301797_7dp90f.jpg?imageView2/0)
焊接时间的不同
焊接的塑胶件尺寸不同
超声波焊接:中小型零件,最大不超过250X300mm振动焊接可以焊接同种塑料同种类型,例如ABS与ABS;可以焊接同种塑料不同类型,例如同种塑料填充类型和非填充类型;振动焊接可以焊接不同种塑料,不同塑料兼容性如下图所示。
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1698155293572_kj2739.jpg?imageView2/0)
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在进行具体的结构设计时,需要为熔接的塑料提供足够的空间。![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1698155297720_kzs4ob.jpg?imageView2/0)
振动焊接产生的应力较大,需要通过设计保证塑胶件具有足够的强度。![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1698155297950_n4t95k.jpg?imageView2/0)
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汽车进气歧管
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用于阀盖的焊接,两侧无溢料
![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1698155300289_n21mls.jpg?imageView2/0)
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用于高压力产品(如储液容器) ![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1698155303390_2krqax.jpg?imageView2/0)
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把一个工件如金属或PCBA放入塑胶件内,在一个焊接周期内同时焊接![](https://public.fangzhenxiu.com/fixComment/commentContent/imgs/1698155302474_0nklcz.jpg?imageView2/0)
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