Hota Industrial, Taiwan’s leading manufacturer of drive components, has implemented the Mando G211 mandrel from Hainbuch in its production of transmission parts for electric vehicles. Utilizing low-alloy case-hardening steel and producing 20,000 units monthly, the company faced significant demands on its machinery and tools. Hainbuch’s innovative solution has led to a remarkable 20% increase in productivity.
The partnership between Hota and Hainbuch commenced in May 2021, aimed at improving clamping methods before hardening to enhance process reliability and quality. The drive gears are produced using a Hartech HGH-250 gear hobbing machine, part of Hota Industrial Group’s mechanical engineering division. Previously, the company relied on collets for producing helical drive gears, which did not meet the required standards for concentricity and repeatability, according to Alex Chao, Deputy Head of Design at Hota Industrial.
Achieving Impressive Rigidity
The Mando G211 mandrel offers radial clamping with a pull-back effect, providing a radial clamping force ranging from 42 to 150 kN, depending on the size of the mandrel. This level of rigidity ensures the necessary accuracy for production. Integrated flushing channels prevent chip buildup in the clamping device, while the improved process reduces machining time per part. The mandrel’s segmented clamping bushings are vulcanized, helping to dampen vibrations during machining, which has significantly extended tool life since installation.
Reduced Set-Up Time by 20%
The Mando G211 mandrel boasts a longer service life compared to the previously used collets. Chao emphasizes, “The segmented clamping bushings provide high concentricity and long vulcanization service life,” highlighting why this clamping device was selected. The G211’s user-friendly design, featuring a slim tool runout contour, is ideal for gear manufacturing. The mandrel has a maximum length of 213 mm and allows for a clamping range from 20-28 mm (0.5 mm span) to 69-120 mm (0.9 mm span), simplifying workpiece diameter tolerances during preparation. This transition to the Hainbuch mandrel has resulted in a 20% decrease in both set-up and machining times.
The Impact of Quality Service
The choice of the right workholding technology has greatly enhanced Hota’s production process. Chao notes that Hainbuch’s guidance played a crucial role in selecting the workholding manufacturer: “We are very satisfied with the service and advice provided by the Hainbuch team.” The Mando G211 mandrel outperformed competitors in stability, service life, and cost-effectiveness. Hota plans to integrate the Hainbuch Mando G211 as a standard option for all new machinery moving forward.
Founded in 1966, Hota Industrial has evolved from a small family workshop into the largest manufacturer of power transmission components in Taiwan. With an annual production output of 20 million components, Hota is a global leader in transmission manufacturing, exporting 96% of its products to automotive manufacturers worldwide. Since 2023, Hartech has operated as the mechanical engineering division of the Hota Industrial Group, overseeing the gear business separately.
