在钢材上钻孔并不是一项周末可以随意完成的家务活。 这是一项繁重的工作，需要合适的装备。 普通钻头在硬化钢上产生凹痕之前会变钝、过热或折断。 这就是为什么选择最好的金属钻头 不仅仅取决于偏好，还取决于物理原理。 您需要能够承受极端高温和压力的工具。
在硬件方面，选择可能让人感到不知所措。 但如果您想穿透厚钢、铸铁或钛，有两种明显的竞争者：钛涂层钻头和钴合金钻头。 两者各有优势。 两者都有弱点。 了解其中的差异可以将一个干净的漏洞与一个被毁掉的项目区分开来。
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Titanium-coated drill press bits: hard and fast, but not indestructible
Titanium drill press bits are mainly high-speed steel (HSS) drill press bits coated with black titanium oxide. The name comes from this coating. It’s not pure titanium from start to finish. The coating significantly increases hardness and corrosion resistance. These drill press bits run cooler and last longer than standard HSS drill press bits. Ideal for general metal working, especially soft metals such as aluminium, brass and mild steel.
However, there is a problem. Because titanium is superficial, this drill press bit cannot be sharpened. If the coating wears or the cutting blade becomes dull, the drill press bit becomes useless. Must be replaced. Titanium blades have a harder surface than cobalt, but do not have the core toughness of cobalt alloys. Too much pressure or drill pressing into something harder than designed can crack the coating or break the drill press bit. It cuts fast but is fragile.
钴钻头：淬硬钢的重量级钻头
钴钻头则讲述了不同的故事。 它们由注入钴的高速钢合金制成——通常含量为 5% 或 8%。 这种组合改变了一切。 钴钻头具有令人难以置信的耐热性。 即使钻孔摩擦产生高温，它们也能保持坚硬。 这使得它们成为淬火钢、不锈钢、铸铁和磨料的首选。
与钛涂层选项不同，钴钻头整体坚固。 你可以削尖它们。 当钴变钝时，您可以恢复其边缘并继续使用。 尽管前期成本较高，但这种长寿通常使它们在频繁使用时更具成本效益。
但他们有自己的要求。 钴钻头很脆。 如果你让它们旋转得太快而不进行切割，它们会产生热量并可能折断。 你必须慢慢开始。 使用稳定的压力。 让钻头完成工作。 将钴钻头冲入钢中是最终得到一堆金属碎片的快速方法。
In addition to drill pressing: Drill presses and coatings
Bits are only half of the equation. Driving is just as important. For serious metal drill pressing, a drill press press is often the better choice over a handheld drill press. brings stability. This ensures that the drill press bit goes perpendicular to the surface of the material. Reduces the chance of the drill press bit walking or breaking.
When buying a drill press, don’t just look at the material. Note the length. Jobber drill press bits are very versatile and are standard for most jobs. However, if you are drill pressing deep holes, you may need a longer flute.
Why not consider recoating? Titanium oxide black is common, but titanium nitride (TiN) coatings are also an option. TiN forms a gold layer that significantly reduces friction. dissipates heat and extends the life of the drill press bit. Carbide drill press bits are also worth mentioning. They are harder than titanium or cobalt and can withstand high temperatures. However, they are very fragile and expensive. Requires strict settings such as a drill press press to prevent damage.
做出正确的选择
那么，钴和钛哪个更硬？ 从表面来看，钛涂层更硬。 但从结构上来说，钴合金更坚固，适合艰巨的工作。
如果您偶尔要在软金属或金属板上钻孔，钛涂层钻头会快速、便宜且有效。 当它们磨损时，你不会介意扔掉它们。
如果您使用不锈钢、淬硬钢或经常进行此类工作，那么钴钻头是最佳投资。 它们能更好地处理热量。 它们可以被削尖。 它们能够幸免于会破坏涂层钻头的惩罚。
FAQ: Metal drill pressing basics
What are the best drill press bits for metal?
There isn’t one “best” part of every job. Titanium coated high speed steel is suitable for soft metals. Hardened steel, stainless steel or cast iron cobalt drill press bits are standard. Conventional drill press bits fail quickly in these materials.
What is a cobalt drill press bit?
A high speed steel drill press bit alloyed with cobalt (usually 5-8%). This makes them more heat resistant and durable than standard steel drill press bits. Easy to sharpen, so it is perfect for hard materials.
How do I know if the drill press bit is suitable for metal?
See the package. Specify the material as high speed steel, cobalt or carbide. Visually, you can see that a metal drill press typically has a wider blade angle (118-135 degrees) compared to a wood drill press (90 degrees). It can also have a black oxide coating or a gold TiN coating. Carbide drill press bits are usually gray and very hard.
Can a metal drill press bit be used on wood?
Technically possible, but not ideal. The wide tip and twist design of metal drill press bits can cause splintering and tear-out in wood, especially softwood. A titanium-coated drill press bit may work better than other drill press bits here, but a separate wood drill press bit is always the cleanest option.
Which is harder: cobalt drill press bit or titanium drill press bit?
Titanium-coated drill press bits have a harder surface layer. Cobalt drill press bits have a tougher core. The coating of titanium bits cannot be sharpened. Solid cobalt alloys do. Cobalt is excellent for drill pressing deep, hard holes. Titanium is sufficient for fast, shallow work of softer metals.
