After quenching, high-speed steel (HSS) reaches a hardness of HRC 60+ — both hard and brittle:
- Hard: Cold straightening can’t move it; forcing it risks cracking and chipping.
- Brittle: Stress concentrates at the bend point — even slight over-force causes fracture.
- Variable: Manual heating relies entirely on experience — overheating burns hardness, underheating leaves it unstraight, and S-bends or double bends easily appear.
- People-dependent: Straightening quality is tied to veteran workers — limiting throughput, consistency, and staffing stability.
Fortunately, our automatic straightening machine solves this challenge perfectly:
- Sensors automatically detect the bend location.
- Precise heating at the straightening point avoids overheating and underheating — no new internal stress is introduced during the process.
- Localized heating preserves drill hardness — HSS hardness and microstructure remain stable after straightening.
- Automatic force application with spring-back compensation delivers a high first-pass yield, reducing repeated straightening.
Our Straightening Machine:
This machine is quipped with a induction heating system and temperature measuring system
This machine is designed with 4 servo motors and 2 stepping motors.
AMS-300H Straightening Machine:
Suitable Drill bits size: Diameter 3-8mm and length 80-300mm
AMS-450H Straightening Machine:
Suitable Drill bits size: Diameter 3-8mm and length 80-450mm
AMS-300H Straightening Machine:
Suitable Drill bits size: Diameter 8-13mm and length 100-550mm
HSS Drill bits Straightening Machine Video:
HSS and cobalt-alloyed HSS workpieces reach a hardness of HRC 62–66 after quenching, with markedly increased brittleness. Even a slight excess of bending force during straightening can cause drill bit fracture or micro-cracking — this is the core challenge. To address this, we have developed a specialized straightening solution for HSS and cobalt HSS workpieces that effectively resolves the cracking and fracture problem. These machines are now widely deployed throughout China, especially in the twist drill manufacturing industry.
For more information please contact:
whatsapp: +86-13851850644
email: john@straighteningmachinery.com
website: www.straighteningmachinery.com
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