整体硬质合金钻头(VHM钻头)是当今机械加工中广泛使用的工具。在数控机床中，一般是首选，只有在某些特殊情况下不适合使用硬质合金钻头时才使用HSS(Co)。在本文中，您可以阅读更多关于整体硬质合金钻头，特别是关于Dormer的整体硬质合金钻头:力X和力M。
硬质合金钻削的演变
多年来，硬质合金钻头的普及程度显著提高。在20世纪80年代，由于机床和夹具的稳定性有限，它的应用条件仍然很严格。然而，这不再是现代数控机床的障碍。这就是为什么整体硬质合金钻头现在广泛应用于各种机器的原因。
近年来，铣床和车削机床的稳定性和生产能力都有了很大的提高。此外，在基础材料、涂层和几何领域，工具的发展已经起飞。因此，现在可以用硬质合金钻钻非常深的孔。这在以前是不可想象的，因为这会立即导致钻头断裂。
然而，整体硬质合金钻头仍然主要用于最大深度的孔。3 xd或5 xd。随着越来越多的机床配备高压冷却通过主轴，使用整体硬质合金钻头的冷却通道已经起飞。
硬质合金钻削的优点和缺点
- 更高的生产率
- 工具寿命更长
- 更高的孔精度和尺寸稳定性
- 更好的定位精度
- 孔表面质量更好
- 能用于较硬的材料吗
- 更耐高温发展
- 在系列化生产中，钻孔成本较低
缺点
- 比高速钢或高速钢钻头更贵
- 对机器、夹具或工件的不稳定更加敏感
- 高转速要求
Dormer生产的硬质合金钻头
Dormer Pramet主要致力于开发适用于广泛应用的工具。毕竟，许多生产公司使用各种不同的材料。那么，更有效的是利用工具来实现所有这些材料的良好生产力。Dormer Pramet的整体硬质合金钻头包括两个系列:Force X钻头和Force M钻头。
The series consists of drills with a possible drilling depth of 3xD, 5xD and 8xD. The first two are available in a version with cooling channels and a version without cooling channels. The latter drill is only available with cooling channels, because at that depth it is necessary to evacuate the chips from the hole by means of cooling pressure.
Unique to the Force X series is the CTW TM geometry. This ensures a good centering point in combination with a much better resharpenability of the drill. With VHM drills, it is worthwhile to regrind several times due to the higher purchase price. This leads to a saving of valuable raw materials and tool costs. Solid carbide drills often have quite complex point geometries, which means that in practice a lower performance can be experienced when regrinding. The CTW TM geometry offers a solution for this.
Force X drills feature a reinforced cutting edge design. This benefits the standing time. In addition, the drills with through holes will generate less forces in the material when they come through. Also, the cutting angle design increases the hole quality and cross-hole drilling will be better and quieter. The cutting edge of the solid carbide drills have been specially treated, making them more stable without losing their sharpness. This also increases the tool life and makes the cutting edge less likely to crumble or flake.
Force X Series:
The Force X drills described above are characterized by their wide usability. The Force M has been developed specifically for stainless steels (ISO M) and titanium alloys (ISO S). Since these materials demand a lot from the tools, in practice it pays to use a specific drill for the desired productivity. Dormer Pramet's Force M drills are ideal for this.
The Force M has undergone a number of changes compared to the Force X (see the image)
The Force M proves to be an ideal choice, especially if a light-cutting drill bit is desired for drilling in long-chipping materials. Practice shows that it can be used much more widely than what it was originally developed for. Our advice is therefore to choose the Force M if you not only have to drill in ISO M and/or ISO S materials, but also regularly in normal steel types.
Force M series
CTW stands for Continuously Thinned Web. By this it is meant that the core of the drill, from tip to shank, is constructed so that it is not necessary to provide the drill tip with a taper. Regrinding the clearance surface is sufficient. Since the core of the drill has the same thickness over its entire length, the geometry is more reproducible. With a normal core, the core of the drill gets thicker as the drill gets shorter. As a result, the point has to be ground in deeper and deeper so that the drilling pressure does not increase too much. A thicker core results in a longer cross-cut edge, which determines the force (drilling pressure) required to penetrate the material. The advantage of applying core thinning in the production of the drill is that the symmetry of the drill tip, and thus the drilling accuracy, is better maintained.
1: 4-LEVEL POINT, SPLITPOINT
2: CTW CHIP GROOVE CONTRUCTION
This technology developed by Dormer is now being applied to the solid carbide drills, so that the Force X and Force M drills contribute to the sustainable use of the raw materials needed for the production of carbide. Resharpening becomes much easier and therefore cheaper.
Our solid carbide drills only perform optimally if they are clamped in a high-accuracy recording. Therefore, the shaft is manufactured in accordance with DIN 6535 HA, i.e. a cylindrical unit shaft in H6 tolerance. It is especially suitable for the crimp holder or hydraulic tensioner. Of course, it can also be incorporated into a collet chuck, but in that case we recommend a precision collet chuck (with increased concentricity).
If only weldon holders are available, grinding a chuck on the drill is an option. However, this can negatively affect the accuracy and tool life of the drill at high speeds.
The Force X drills are designed for general purpose applications in steel, alloy steel, stainless steels and cast iron. The Force M drills have been specifically developed for stainless steels and titanium alloys.
