Hard part turning description (figure)

As a process, hard part turning has moved forward and is now able to cope with conventional and emerging needs.

Challenge: How to re-optimize hard part turning?

Solution: Correctly apply the latest blade grades and geometry based on existing operational data.

Since the widespread introduction in the mid-1980s, hard part turning (HPT) has made great progress as a processing technology. The development of machinery, part materials, quenching processes, cutting tools and complete hard part turning settings has made hard part turning an efficient process and is mastered by any shop.

Hard part turning has many benefits, so it is necessary to analyze most applications involving round hard parts. While hard part turning should not be considered as an alternative to all grinding operations, in some applications, the two processes do complement each other.

Cubic boron nitride reduces cycle time, improves quality and productivity

The main advantages of hard part turning are:

• Easy to adapt to complex part shapes • Quickly switch between multiple parts • Can perform multiple processes in a single setup • High metal removal rate • CNC lathes that can be used for commissioning turning • Low machine investment • Metal chips Conducive to the environment • Coolant is not required in most cases • Minimize tool storage and floor space • Surface finishes tend to have advantages.

CBN is the most widely used hard-part turning tool material because it meets the requirements of most applications. It has a very high hardness (after diamonds) and can be combined with blade grades with different toughness. A variety of newly developed cubic boron nitride insert grades are available to meet a variety of increasingly advanced process requirements such as cutting speed, feed, continuous and interrupted cutting, surface finishing and various conditions.

The combination of high cutting forces concentrated in the processing zone and high temperatures creates high pressures, so in hard part machining, the main manifestation of tool wear is crater wear on the cutting edge. Hard cubic boron nitride is the only tool material that meets these requirements and has reasonable toughness. The latest developments in cubic boron nitride grades have provided a means to further limit wear, while improving edge safety, expanding application range, and increasing cutting speeds by up to 20%.

Productivity, quality consistency and process reliability are the basic standards for today's hard part turning. Since hard part turning has evolved into a widely used process and has the advantage of finishing parts after heat treatment, various requirements have been placed on processing efficiency.

Tool development plays an important role as productivity is an increasingly important factor in today's hard part processing. Trends include increasing cutting speeds (some grades up to 200 m/min), extending tool life, and improving tool life predictability. The feed rate has also been improved, and the cutting time is shortened by the development of the blade strength and the groove shape.

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JIS" Stands for Japanese Industrial Standard and are published by the Japanese Standards Association (JSA) which is the equivalent of ANSI in the United States. They are created and updated by the Committee of the Japanese Industrial Standards (JISC). Like JSA to ANSI, the JISC is similar to the American Society of Mechanical Engineers (ASME).