Category: Thread Machining

Long Tool Life, Short Processing Time and Excellent Surface Quality – three advantages of solid carbide thread milling cutters from Johs. Boss GmbH & Co. KG Präzisionswerkzeugfabrik, Germany.  Available in a wide range of Thread Milling Cutters, Drill Thread Milling Cutters and Indexable Thread Milling Cutters including specials.

The SHARK high-performance Thread Milling Cutters from JBO offer precise thread machining – complemented by the G-thread range within the GFT series (solid carbide three-profile thread milling cutters).

General Advantages of Thread Milling

1. Threads to different tolerance classes can be produced with same cutter
2. Tool breakage does not necessarily entail scrapping of the workpiece
3. Less power needed for cutting internal threads
4. Short machining times due to high cutting speeds
5. Excellent thread surface finish
6. Short chips, hence no chip problems
7. Right and left hand threads can be produced in blind or through holes by the same cutter
8. Low cutting forces enable threads to be cut in thin wall workpieces
9. Cutting speeds and feeds can be matched individually to workpiece material
10. No change of cutter spindle direction of rotation required
11. No special tapping chucks required, standard chucks suffice
12. Threads can be cut to exact depth
13. Threads can be cut down to near bottom of blind holes
14. Start of thread accurately determined by NC programme

Please contact us to analyze your machining process and work out an optimized solution.

 

Tool Life Tripled!

The turned parts manufacturer Schauerte machines threads in high-alloy, corrosion-resistant Cr-Ni steel much more economically with GFM Shark thread milling cutters from Johs. Boss GmbH & Co. KG, brand JBO.

Wilhelm Schauerte GmbH & Co. KG in Lennestadt employs 140 skilled workers to manufacture turned parts for the automotive industry, general mechanical and apparatus engineering and sanitary engineering. Among other things, tapered Whitworth pipe threads Rp ½″ (14 threads per inch) have to be inserted into components made from the corrosion-resistant, high-alloy steel X2CrNiMo17-12-2 (material no. 1.4404) over a thread length of around 15 mm. Rotary transfer machines produce these components in large series. In the past, the contract manufacturers in Lennestadt used thread milling cutters from different tool manufacturers to mill the threads. However, the tool life and tool life proved to be insufficient. After just under 12,000 threads, the tools were worn out and had to be replaced. This caused frequent downtimes of the highly productive rotary transfer machines.

Optimized Cutting Geometry

The contract manufacturers in Lennestadt now machine much better and more economically with GFM Shark thread milling cutters (D16x41xG14 IK) from JBO (Johs. Boss GmbH & Co. KG). The tools are held in TENDO Turn hydraulic clamping systems (Schunk). The threads are cooled and lubricated with oil during milling.

The cutting edge geometries of the GFM Shark thread milling cutters are carefully matched to hard, corrosion-resistant steel alloys and now ensure significantly longer tool life. The thread milling cutters machine around 30,000 threads at a cutting speed of Vc=100 m/min and a feed per tooth of fz=0.08 mm up to the wear limit. This means that they achieve almost three times the tool life. On the other hand, they reduce the possible cycle time, as they work more productively than the previously used threading tools.

Multiple Use

A special feature of the thread milling cutters from JBO ensures that the tools also optimize efficiency when milling threads in components made from high-alloy steels. They have a total usable cutting edge length of 41 mm. This means that they are only partially stressed when milling threads over 15 mm in length. They can therefore be shortened (halved) by around 20 mm (once the wear limit has been reached on the utilized part of the cutting edges). With the remaining part of the usable cutting edges, they then machine a further 30,000 threads until the wear limit is reached. This means that the production technicians at contract manufacturer Schauerte can use GFM Shark thread milling cutters from JBO for a total of 60,000 and sometimes even up to 80,000 threads on their rotary transfer machines. As specialists at Schauerte confirm, this is done reliably and with process security. With these six times the tool life – compared to conventional thread milling cutters in the past – the GFM Shark thread milling cutters from JBO prove that they can produce much more economically with high process reliability. The contract manufacturer in Lennestadt can now reduce its demand and procurement for thread milling cutters to around a third or even a sixth of the quantities previously required.

Please contact us for more information on JBO GFM Thread Milling Cutters for your applications.