Threading Options for Hard Materials
Here are three approaches to threading hardened components.
Share
Threading hardened materials such as this one that requires an ACME thread presents a range of challenges.
Shops have options when it comes to hard threading. However, Seco Tools says most of them involve multiple operations and tools, each of which presents the risk of human error, a possible increase in cycle times and a probable hindrance of part consistency.
Here, the company highlights three such tooling options, along with their limitations:
1. A tungsten-carbide-tip insert brazed onto a steel, stick-type tool.
- Every tool change requires datums to be set again, which extends downtime.
- Material has to be annealed prior to machining and re-hardened afterward,which increases the risk of thread distortion.
- Tool life is short and cutting speed is typically limited to approximately 40 m/min.
- Long cycle times, often measured in days, occur because of multiple operations.
2. A brazed-tungsten-carbide or polycrystalline-boron-nitride (PCBN) grooving tool for roughing, and an insert made from either of those materials to finish profile.
- This time-consuming, two-tool operation requires annealing the workpiece if using the tungsten-carbide tool.
- The brazed tool joint needs coolant, and it limits cutting speed because of heat.
- Low cutting speeds extend cycle times (a 33-mm-pitch Acme thread can take as long as five hours).
- Rapid flank wear and built-up edge (BUE) occur due to low cutting speeds.
3. PCBN-tipped insert brazed to a steel shank.
- Every tool change requires datums to be set again, which extends downtime.
- The brazed tool joint needs coolant, and it limits cutting speed because of heat.
- Low cutting speeds extend cycle times (a 33-mm-pitch Acme thread can take as long as three hours).
- Rapid flank wear and BUE occur due to low cutting speeds.
Related Content
-
Quick-Change Tool Heads Reduce Setup on Swiss-Type Turning Centers
This new quick-change tooling system enables shops to get more production from their Swiss turning centers through reduced tool setup time and matches the performance of a solid tool.
-
High-Feed Machining Dominates Cutting Tool Event
At its New Product Rollout, Ingersoll showcased a number of options for high-feed machining, demonstrating the strategy’s growing footprint in the industry.
-
Custom PCD Tools Extend Shop’s Tool Life Upward of Ten Times
Adopting PCD tooling has extended FT Precision’s tool life from days to months — and the test drill is still going strong.