With the new HU3, HU5 and HU7 geometries, Walter is completing its range of indexable turning inserts for heavy-duty roughing operations. The ‘H’ designation is for negative, single-sided and therefore highly stable inserts, standing for ‘Heavy (roughing)’, while the ‘U’ refers to universal use. Each of the three new geometries has specific features making them suitable for different applications.

The HU7 geometry for steel and cast-iron workpieces is the most stable turning indexable insert in Walter’s product range. It has a straight cutting edge while the negative protective edge chamfer ensures its suitability for use at high feed rates with depths of cut up to 17 mm. According to Walter, HU7 demonstrates excellent stability and is suitable for large-volume machining, even in difficult conditions, including the machining of forged parts or interrupted cutting operations.

Compared with HU7, HU5 geometry incorporates a curved cutting edge and an open chip-breaker groove design that provides a slightly softer cutting action to reduce cutting pressure and cutting forces. HU5 is therefore the first choice insert wherever heat generation and/or vibration occur. The grade is particularly suitable for the rough turning of high-temperature alloys and stainless steel.

The third insert design, the HU3 geometry with V-shaped chip formation optimises chip breaking even at small depths of cut and fluctuating material removal rates. This feature makes the HU3 suited to machining parts with a forged skin or varying surfaces. HU3 is primarily for use on steel materials with depths of cut from as low as 0.8mm, while maintaining chip control.

All three turning insert geometries are coated with the new Tiger•tec Gold grades, WPP10G, WPP20G and the WPP30G.
For further information www.walter-tools.com