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BQUQ CNC加工MOSFET散热器 – 中国精密制造

这是一款CNC加工的MOSFET散热器,专为热失控风险较高的高电流开关应用而设计。我们确保安装表面平整度在0.02 mm TIR以内,阳极氧化表面硬度达到45 HRC,标准型材的交期保证为7个工作日。我们在中国东莞制造这些产品,凭借20年的精密制造经验,每一片散热鳍片都精益求精。 为什么低于0.02 mm TIR的平整度对MOSFET结温至关重要 MOSFET的热阻取决于器件引脚与散热器之间的


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这是一款CNC加工的MOSFET散热器,专为热失控风险较高的高电流开关应用而设计。我们确保安装表面平整度在0.02 mm TIR以内,阳极氧化表面硬度达到45 HRC,标准型材的交期保证为7个工作日。我们在中国东莞制造这些产品,凭借20年的精密制造经验,每一片散热鳍片都精益求精。

为什么低于0.02 mm TIR的平整度对MOSFET结温至关重要

MOSFET的热阻取决于器件引脚与散热器之间的接触面积。如果表面弯曲或存在高点,空气间隙会积聚热量,导致结温超过125°C。我们在5轴CNC机床上加工基底,并进行最终飞刀精铣。这使得整个基底的表面平整度达到0.02 mm TIR,而不仅仅是中心区域。您可以直接安装TO-247或TO-220封装,无需研磨或使用导热膏补偿。

铝6061-T6 vs. 铜C1100 – 影响热性能的材料选项

我们为MOSFET散热器备有两种主要材料。铝6061-T6是默认选择:导热系数180 W/m·K,硬质阳极氧化后硬度达45 HRC,重量轻,便于PCB组装。对于单个器件功耗超过50 W的高密度SiC或GaN MOSFET,我们推荐使用C1100铜。其导热系数可达390 W/m·K,但需要镀镍处理以防止氧化。两种材料均以相同的±0.01 mm公差进行加工,我们可以在不改变安装孔位布局的情况下,根据同一图纸切换材料。

我们机加工而非挤压成型的鳍片几何形状 – 高宽比可达20:1

挤压散热器迫使您受限于固定的鳍片厚度和间距。我们对每片鳍片进行独立加工。这意味着您可以在同一零件上指定0.8 mm厚的鳍片搭配4 mm间距,或1.5 mm厚的鳍片搭配10 mm间距。我们的CNC铣床可加工高达80 mm的鳍片,高宽比达20:1,且无振纹。鳍片通道内的表面光洁度为Ra 1.6 µm,可在强制风冷时最大限度地减少边界层阻力。对于自然对流冷却,我们可以在鳍片顶部增加滚花纹理,使表面积增加15%。

硬质阳极氧化至45 HRC – 防止螺丝滑牙和腐蚀

裸铝散热器质地较软。一颗#4-40螺丝以5 in-lbs扭矩拧入,三次安装后就会滑牙。我们采用III型硬质阳极氧化涂层,渗透深度0.05 mm,硬度达45 HRC,可保护您用于固定MOSFET的螺纹孔。该涂层还提供800 VDC的介电击穿电压,因此在低压电路中,您可以直接安装带电引脚,无需绝缘垫片。如果您的应用需要可焊性,我们会遮蔽基底上的阳极氧化层,改为光亮锡表面处理。

每个MOSFET散热器均附检测报告 – CMM和三坐标测量及热阻数据

我们在发货前对每个散热器进行测量。三坐标测量机(CMM)根据您的PDF图纸检查基底平整度、孔位和鳍片平行度。我们还对每批样品进行热阻测试:在基底上安装一个25 W电阻,测量外壳温升,并以°C/W记录结果。完整检测报告将随货运文件通过电子邮件发送给您。如果您需要PPAP Level 3,对于超过200件的订单,我们免费生成该文档。

交期与模具 – 标准件7天,定制鳍片图案15天

我们的标准MOSFET散热器型材由我们内部库存的棒料加工而成。从图纸批准到发货,交期为7天。对于具有独特宽度或孔位布局的定制鳍片图案,交期为15天,因为我们需要编程新的刀具路径并制作夹具。首次订单我们不收取模具费。起订量为零 – 我们以相同的单价发货一件原型或一万件产品,因为CNC循环时间相同。

规格数值
材料铝6061-T6或C1100铜
基底平整度(TIR)0.02 mm
加工公差±0.01 mm
表面光洁度(鳍片通道)Ra 1.6 µm
表面硬度(硬质阳极氧化)45 HRC
鳍片厚度(最小)0.8 mm
鳍片高度(最大)80 mm
最大基底尺寸300 mm x 200 mm
涂层选项III型硬质阳极氧化、光亮锡、镀镍
标准交期7个工作日
定制交期15个工作日
起订量无起订量

安装孔和螺纹嵌件 – 由我们加工,而非您自行处理

无需再自行钻孔。我们直接在基底上加工TO-220、TO-247和TO-264封装的安装孔位。孔深公差为±0.05 mm,我们在同一装夹中攻丝,以确保垂直度。如果您使用自攻螺丝,我们可以增加带倒角的导向孔,引导螺丝顺畅进入,避免磨损。对于高振动环境,我们压入黄铜或不锈钢螺纹嵌件,可承受30次重新拧紧循环而不会磨损。

定制MOSFET散热器的最小起订量是多少?

没有起订量 – 我们以相同的单价加工单件原型或批量生产,因为我们的CNC装夹时间是固定的。

你们能否匹配现有的挤压散热器设计?

可以,将零件或图纸发送给我们,我们将加工出可直接替换的产品,公差更严格,并可提供原挤压件无法实现的硬质阳极氧化选项。

你们如何在发货前验证热性能?

我们在样品散热器上安装一个校准的25 W电阻,在25°C环境温度下测量外壳温升,并将测得的°C/W值包含在检测报告中。

原型的最快交期是多久?

如果您从我们的目录中批准标准型材,我们可以通过24小时加工和隔夜空运,在3个工作日内发货一件。

如何发送图纸并在12小时内获得正式报价

将您的step、IGES或PDF图纸发送至sc@bquq.com。请注明MOSFET封装类型(TO-220、TO-247等)、目标外壳温度以及您可用的气流条件。我们将在12小时内回复,提供正式价格、交期,如果您不确定材料,我们也会推荐合适的材料。如有紧急需求,请通过WhatsApp联系我们:+86 13713157787,我们将通过电话审阅您的图纸。

我们的CNC加工工艺详见CNC刀具选择指南CNC加工公差指南,适用于本产品类别。如需更全面地了解我们为何采用机加工而非挤压工艺,请阅读我们的散热器生产优势文章


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参数

参数能力
材料AL6063/6061/5052,纯铜C1100,铜铝复合
工艺挤压、CNC加工、铲齿、锻造、压铸、冲压翅片
翅片类型挤压翅片、针翅、铲齿翅片、折叠翅片、粘合翅片、热管、均温板
表面处理黑色阳极氧化、本色阳极氧化、镀镍、粉末喷涂
尺寸范围最大1500 x 400 x 300 mm
热测试每批次提供热阻和散热数据
打样5-7天,样品无最小起订量
检验三坐标测量仪、热阻测试仪,每批次提供完整报告

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