Grooving and cutting knives both play an important role in industrial applications, but their design, application and the materials they handle vary. The grooving knife is mainly used to make notches or grooves on the surface of the workpiece, while the cutting knife is mainly used to cut materials such as metal bars or pipes. Understanding the working principles and selection criteria of these two tools is essential to improve cutting efficiency and safety. This paper will deeply discuss the difference and working principle of grooving knife and cutting knife, and provide practical selection suggestions.

I. Shape and structure:

1. The head of the cutting knife is long and the blade is narrow, which helps to reduce the material consumption of the workpiece and ensure that it can be cut to the center when cutting. Therefore, the length of the cutting tool head must be greater than the radius of the workpiece.
2. The grooving knife is similar to the cutting knife, but its shape should be consistent with the grooves. A slotting knife is a long type of tool that is mainly used to make notches or grooves on the surface of the workpiece. It usually includes a cutting edge, a manipulator handle and a fixed fixture, which can be adjusted to cut the required notch on the workpiece surface.
   Second, use:
3. The slotting knife is mainly used to cut the surface of the workpiece and make notches or grooves. It is cut in a one-time (non-continuous) way, by cutting the material on the surface of the workpiece to form the desired notch or groove.
4. The cutting knife is mainly used for cutting metal bars or pipes and other materials. Due to the need to deal with the high-strength material cutting in industry, the cutting knife needs a high hardness, and the commonly used hardness is more than HRC60. The cutting method of the cutting knife requires continuous force to cut the material, so it can make multiple cuts along the length direction of the material being cut.
   Third, hardness:
5. The hardness of the slotting knife is relatively low, because it is mainly cut by cutting the material on the surface of the workpiece.
6. The cutting knife requires a higher hardness to deal with the cutting of high-strength materials, and the commonly used hardness is more than HRC60.

In summary, the grooving knife and the cutting knife are different in shape and structure, use and hardness requirements. In actual operation, the appropriate tool type should be selected according to the needs, and the corresponding operating specifications should be followed to ensure the cutting effect and safety.