In 1898 Guhring produced the first HSS drill and remains true to its beginnings. Our variety of drilling tools is unparalleled in the market. The product range stretches from micro-precision drills Ø 0.05 mm to special solutions with Ø 180 mm and from HSS to solid carbide or PCD.
A high chrome and nickel content in stainless steels ensures a high corrosion resistance and strength. However, the machinability of the material deteriorates at the same time – Process temperatures rise. The RT 100 Trigon® drill however ensures high cutting speeds and feed rates – its innovative coolant duct geometry makes it possible.
Stainless high-grade steel such as V2A is applied for increasing number of products and components. These steels excel especially thanks to a high content of alloying elements such as chrome and nickel. Examples for the application of V2A components can be found in the energy technology sector (i.e. heat exchanger components), the chemical industry, aircraft construction as well as in mechanical and automotive engineering.
The high content of alloying elements increases the difficulty in the machining of stainless high-grade steels. In addition, high cutting speeds and feed rates are required for economically efficient drilling operations. The result is high process temperatures during the drilling process especially in the high-alloyed steels as described. They put high demands on solid carbide drilling tools and ultimately accelerate tool wear.
CFD-simulation of flow behaviour in comparison:
Conventional coolant duct left and Trigon coolant duct design on the right in metres per second.
Developed as a special tool option of the RT 100 Trigon series is RT 100 type C specially designed for long-chipping materials. It is available as a special tool ø 3 to 20 mm up to 7xD drilling depth. From ø 6.00 mm type C possesses the new Trigon coolant duct design.
RT 100 Trigon® - new coolant duct design
Innovative cross-sectional coolant duct geometries were developed in order to meet these requirements. RT 100 Trigon® is an innovative spiral fluted drilling tool for the machining of stainless high-grade steel with patented coolant duct design for maximum performance.
The new coolant duct form therefore optimises coolant volume, flow speed and flow direction and extreme process temperatures are perfectly dissipated. In comparison to conventional round coolant ducts the cooling medium is specifically guided to the areas of the tool under the heaviest loads, the cutting lip and the cutting edge corners.
Micro machining is constantly gaining importance in industries from mechanical engineering to electrical engineering. Here the drilling operation is the focal element. The smaller the components become the higher the demand on precision, consistent accuracy and economic efficiency of the process.
Guhring’s solid carbide micro-precision drills without coolant ducts cover a diameter range from 0.1 mm to 3.0 mm. Under stable machining conditions and with high-performance machines extremely good cutting parameters and long tool life can be achieved with solid carbide micro-precision drills. Amongst other things the application of ultra-fine carbide with the very high hardness displays an extreme wear resistance, makes the enormous performance capabilities of solid carbide micro-precision drills possible.
Series production on a rotary transfer machine
Material: Heat-treatable steel 42CrMo4, with external cooling 10% soluble oil,
Guhring’s micro-precision drills in powder metallurgical HSS-E steel distinguish themselves by a very high wear resistance and a high toughness and cutting edge stability that is especially important under unstable machining conditions. The powder metallurgical manufactured HSS-E steel has a very homogeneous structure that has a positive effect on the consistently high performance capabilities of micro-precision drills.
Series production on multi-spindle machines
Material: Stainless Steel 1.4301,
with external cooling, 10% soluble oil,
also with internal cooling
Solid carbide ExlclusiveLine micro-precision drills, with or without IC, make the high-performance machining of most materials possible. With stable machine conditions and high machine performance they can display their full performance capability. The 2-facet geometry per cutting edge with ground cutting edge honing permits high cutting values and an optimal chip break.
Application example 1:
Material: Alloyed case hardened steel 16MnCr5, Internal cooling with 8% soluble oil,
Application example 2:
Material: Stainless steel X6CrNiTi18 10, Internal cooling with 12% soluble oil:
Guhring provides the optimal solution for large batch series production with machine conditions with maximum performance and internal cooling as well as also for machining tasks with smaller batch sizes or with limited machine performance and difficult machining conditions.
Guhring’s comprehensive micro-precision drill programme of solid carbide and HSS-E-PM micro-precision drills covers the entire diameter range from 0.05 mm to 3.0 mm:
Carbide or HSS? The competences of tool materials are clearly defined – and carbide as the tool material for drilling tools has nowhere near been able to establish itself in all fields of application. Particularly with small and medium series production, with unstable machining conditions and always when toughness is required, users continue to rely on drilling tools in high speed steel (HSS/HSCO). With an enormous product range and an extraordinary high manufacturing depth Guhring’s HSS/HSCO drilling tool product range is unequalled world-wide.
HT 800 is suitable for the machining of steel, stainless steel, cast iron and aluminium. With various geometries and coatings the inserts are always perfectly adapted to the respective field of application.
Thus HT 800 with optimised flute geometry achieves holes of the same quality as of a solid carbide drill. In combination with internal cooling the open flute ensures an optimal chip evacuation, especially out of deeper holes. As a programme extension Guhring now also provides interchangeable inserts for the machining of steel beams and carbon steel.
Steel beams for the most varying metal constructions are generally manufactured on special drill / saw machines. The clamping facilities on these machines are often unstable. That places particularly high demands on the drilling tools. The tool geometry must be designed to compensate for the unstable conditions and ensure a smooth drilling performance.
With a new carbide special drilling tool based on the modular tooling system HT 800 WP Guhring provides an optimal tool for the machining of steel beams, it scores points with good centering characteristics and a smooth drilling performance.
The point geometry of the new interchangeable inserts ensures optimal centering characteristics and therefore compensates for unstable machining conditions during the manufacture of steel beams. The large point angle in the outer area of the insert guarantees minimised burr development.
The interchangeable inserts for the machining of steel beams can be applied using all HT 800 standard holders 1xD, 1.5xD, 3xD, 5xD, 7xD and 10xD. The modular system enables a simple insert change directly on the machine.
HT 800 WP for the machining of carbon steel
Guhring has also extended its HT 800 programme for the machining of carbon steels. The robustly shaped cutting wedge of the special interchangeable inserts ensures high wear resistance without increasing the process forces. The concave shaped cutting edge ensures an optimal chip break in long-chipping steels.
The interchangeable inserts have already been able to deliver remarkable results:
HT 800 consists of a wear resistant steel holder, an interchangeable cutting insert and a locking screw to provide the clamping requirement. Thanks to close fitting tolerances of the insert pin and locating hole the insert has little play and is firmly positioned in the holder. The innovative clamping principle achieves maximum process reliability for holes up to 10 x D. The clamping screws with screw locking improve the grip even with operations subject to heavy vibrations.
Economically efficient and accurate up to diameter Ø 40 mm
With HT 800 Guhring has brought interchangeable insert technology to the market not only making highly accurate large diameter holes possible but also providing cost advantages. Advantages compared to conventional solid carbide drilling tools lie in the enormous machining flexibility thanks to the problem-free replacement of the different inserts depending on the machining of the material.
It stays clamped: Simple exchange on the machine
The HT 800 interchangeable inserts can be exchanged on the machine. The holder remains clamped. A tool change and the associated re-setting is not necessary. The result is an increase in process reliability and shorter set-up times. Machine downtime is drastically reduced.
By setting the standards for the future by creating over 600 patents world-wide Guhring is a major driver of innovation in the field of metal machining. Ever more efficient materials and complex components always demand more effective tools in order to meet the extreme requirements of metal cutting. These requirements, linked together with the idea of energy efficiency and environmental protection, with modern machining strategies often place tool cooling and alternative coolant duct geometries in the foreground.
Also here Guhring has been a forerunner – the Trigon® coolant ducts are patent protected.