Aufrufe
vor 2 Jahren

hp tooling 2019 #1

  • Text
  • Drilling
  • High precision
  • Harnischcom
  • Tooling
  • Coating
  • Pcbn
  • Ceratizit
  • Precision
  • Materials
  • Manufacturing
  • Grinding
  • Machining
The journal of hp tooling is an english, global publication on all aspects of high precision tools, accessories and their applications.

materials While quality

materials While quality features such as geometric size accuracy are easily achieved even for large measuring sequences, the 100 % measuring and evaluation of edge chipping is not part of the standard. Due to the superior resolution of the method the measuring of chipping using the SEM repre - sents the reference value for other measuring methods. Due to the work required for this (e.g. each sample has to be put into the vacuum of the measuring chamber) this measuring method is not feasible for automated measuring of cutting edge chipping in an industrial setting. illustration 4 REM image of the cutting edge to compare chipping at 200-fold enlargement: upper half of image – the fine D9 grain size results in more or less no chips; lower half of image – the rough grain size D25, leaves visible chipping protective chamfer (width 0.2 mm, chamfer angle 25°) could a strong dependence of the chipping on the diamond size selected be seen (table 1). For the final test double layer grinding wheels were used. Solid CBN and brazed PCBN inserts (type DCN450) were ground with selected grinding wheels. Using the best layer combination, the grinding programme for processing brazed PCBN inserts was optimised and finally 60 brazed inserts were produced and evaluated. Test results with brazed PCBN To verify the process, a batch of 60 brazed PCBN inserts were ground with a double layer wheel and measured completely during the main test. For the periphery a 12 mm wide D20 wheel is used (illustration 5). The chamfer was ground with a 4 mm wide D9 wheel. The widths of the partial rim are adjusted to the tool geometry. The wheel wear is 2.2 µm per insert. illustration 5 Double rim: outside 4 mm wider D9 for chamfer grinding, 2 mm air gap and inside 12 mm wide D20 for periphery grinding The grinding process for the complete process of an indexable insert has a cycle time of 128 seconds including loading, unloading and measuring the inscribed circle. The cutting edge chipping was determined by automatically tak ing photos of the edges of the inserts and calculating the chipping with Element Six’s own software for all indexable inserts. For this measuring method, there was on average 2.3 µm with a standard deviation of 0.86 µm. For the investigations of larger test series an optical method was used. For this the whole cutting edge was captured with an optical microscope with 200-fold enlargement. Through suitable geometric arrangement of the sample a direct image of the chipping can be taken and evaluated with the aid of software. During the preliminary tests parallel measurements were carried out using the SEM and the optical microscope. A good consensus of the measured chippings was found. As a result, the optical microscope could be used for the main measuring for complete quality control of the cutting edge chipping. Summary The wear-resistant low-content PCBN grade from Element Six can be processed with little wear of the grinding wheel in an efficient manner and a stable process and minimal cutting edge chipping when using metal bonded diamond double grinding wheels from Tyrolit. Agathon indexable insert grinding machines with PowerGrind enable the conditioning of a double rim with different grain sizes (parallel to the grinding process). Through this a high removal rate for periphery grinding is combined with minimal chip ping during chamfer grinding. Information on the project partners Agathon develops and produces precision grinding machines for the manufacture of indexable inserts as well as lasers for pre-machining of superhard materials. Agathon also manufactures precision guide elements. Element Six is a member of the De Beers Group of Companies and a world-leading company for synthetic diamonds and other supermaterials. Tyrolit is a leading manufacturer of bonded high-tech grinding tools for numerous applications. With regard to cutting tools Tyrolit offers customised complete solutions for customer-specific requirements. Literature [1] Precision machining & finishing, Element Six 2016. 11/16 [2] Enhanced grinding productivity and quality: investigation of a novel in-process Electrical Discharge Conditioning technology; S. Scholze, K. Mayrhofer, W. Pfluger; Procedia CIRP, volume 42, 2016, page 491-496 [3] Produktivitätssprung bei der Schleifbearbeitung von Wendeschneidplatten durch elektroerosives In-process-Konditionieren, (Productivity leap in grinding of indexable inserts through electro-erosive in-process conditioning) S. Scholze, K. Mayrhofer, W. Pfluger, Diamant Hochleistungswerkzeuge, issue 1/2016, page 36-41 further information: www.e6.com 16 no. 1, April 2019

CERATIZIT Group acquires 50 % of the shares in Stadler Metalle GmbH & Co. KG materials An important element for securing the raw material supply chain With effect from March 1, the CERATIZIT Group acquires 50 % of the shares in Stadler Metalle GmbH & Co. KG. The state-of-the-art company specialises in trading and processing secondary raw materials and has a strong focus on carbide. For CERATIZIT, the investment in Stadler Metalle is of strategic importance, as member of the Executive Board Thierry Wolter emphasises. “The investment in Stadler is an unique opportunity for the CERATIZIT Group to secure the entire raw materials supply chain,” Wolter said. “The demand for our main raw materials, tungsten and cobalt, is steadily increasing. Thanks to Stadler’s network and expertise in logistics, we will now be able to focus even more strongly on recycling carbide tools in the supply of raw materials,” Wolter continued. In this way, the Group is at the same time driving forward its corporate strategy of sustainable and responsible production by making greater use of secondary raw materials. Through the partnership, Stadler gains access to the worldwide network and know-how of the CERATIZIT Group Stadler Metalle GmbH & Co. KG Stadler is involved in the recycling and trading of secondary raw materials. With a network of globally active partners and its own fleet of vehicles, the Türkheim-based company is able to respond flexibly and quickly to the requirements of its customers. Based on many years of experience, Stadler combines quality, service and price to provide a range of services in line with market requirements. and can use this as the basis for developing new business models. For managing director and owner Gabriele Stadler, CERATIZIT’s investment is an important building block for the future of the company: “We are firmly convinced that as part of the CERATIZIT Group we can grow faster.” Stadler will continue its operations as before, but in future will benefit from the full support of the CERATIZIT Group. The two private companies have agreed not to disclose the financial details of the transaction. It is still subject to the approval of the antitrust authorities. further information: www.ceratizit.com The countdown s on! Already got your admission tickets? - 21– 24 May 2019 Messe Stuttgart, Germany #MEX2019 www.moulding-expo.com/tickets

Wählen Sie die gewünschte Fachzeitschrift

fng MAGAZIN - Food · Nonfood · Getränke · Tobacco