Mikuni India steigert Produktivität dank PKD-Werkzeugen von MAPAL

Mikuni Corporation wurde 1923 in Tokio gegründet. Heute ist das japanische Unternehmen weltweit präsent mit Niederlassungen in den USA, in Mexiko, Deutschland, Indonesien, China, Thailand, Taiwan und Korea. 2008 haben die Unternehmenslenker von Mikuni die indische Tochtergesellschaft Mikuni India Private Limited in Neemrana gegründet. Die indische Stadt liegt 122 Kilometer südwestlich von Delhi.

Mikuni India bietet den Kunden eine breite Palette an Komponenten für die Automobilindustrie, unter anderem Vergaser und Drosselklappen. Für die hervorragenden Qualitätsprodukte und die Lieferbedingungen wird Mikuni India regelmäßig von der Automobilindustrie mit Awards als „Best Supplier“ ausgezeichnet.

In 2017, Mikuni India faced the challenge of increasing the production volume of carburetors. “Mikuni approached us with the request to considerably accelerate the machining process for large-scale production,” Thanigaraj Sripathy, Managing Director of MAPAL India, remembers.

When carburetor housings are manufactured from an aluminium alloy, the challenging machining of the piston bore and throttle bore are the most time-consuming operations and contribute substantially to the overall cycle time. This was reason enough for the tool specialists at MAPAL to scrutinise these two bores and their machining processes. In the machining process used previously, individual tools with ISO indexable inserts were used for finishing.

The MAPAL team determined that there was great room for improvement here. “We developed a PCD tool that fine machines both the piston and the throttle bores in a single shot,” explains Sripathy. As PCD tools are produced at the MAPAL subsidiary in India, the new tools could be delivered after a short lead time and used immediately.

MAPAL designed a two-stage PCD combination tool for fine machining the piston bore. Four brazed PCD cutting edges are used for boring (21 mm diameter) and two are used for spot facing (30 mm diameter). The machining is performed with a cutting speed of 250 m/min and a feed rate of 600 mm/min.

A three-stage PCD combination tool with two boring steps (diameters of 24.016 mm and 24.664 mm) with two respectively four cutting edges as well as a stage for spot facing (34 mm diameter) uses the same cutting parameters to manufacture the throttle bore in one shot.

Krishan Gopal, Production Manager at Mikuni India, is impressed: “The tool solution from MAPAL not only reduces the machining time significantly. We also don’t need to use a further machining centre, which frees up capacities. We work with considerably higher cutting speeds and machine the bores in one shot. This allows us to save a huge amount of time in the overall process, which is excellent.”

The set target was reached, and productivity was increased considerably. The company now manufactures 2,400 housings per day. Following this successful process optimisation, the Mikuni management distinguished the project as the best kaizen improvement project of the year. The whole team at Mikuni India is very satisfied with the results achieved using the solutions from MAPAL. And so, parts of this type are to be machined with MAPAL tools in the future, too.