The 30 degrees and 40 degrees of the hard alloy spiral rod refer to the angle between the spiral groove on the spiral rod and the axis. Hard alloy spiral rod is a tool used for cutting machining, and the size of its spiral angle directly affects cutting performance and chip removal effect.
The hard alloy spiral rod with a 30 degree helix angle has good rigidity and chip removal performance, making it suitable for low-speed and large feed machining methods. However, due to the large rake angle, the cutting edge is not sharp enough, and the resistance is high, so the performance during high-speed cutting is not as good as products with a 45 degree helix angle.
A hard alloy spiral rod with a 40 degree helix angle has sharper cutting edges and is suitable for high-speed, low feed machining methods. Its chip space is large, and its chip removal performance is not as good as products with a 30 degree helix angle, but the cutting edge is sharper, which is beneficial for fast chip removal and reducing cutting resistance.
The selection of the appropriate helix angle depends on the specific processing material and processing requirements. When processing hard materials, a smaller helix angle is usually chosen to ensure the rigidity of the drill bit; When processing soft materials, a larger helix angle can provide better cutting results.
