Cutter for machining Fresnel patterns and manufacture method of cutter

Abstract

The invention discloses a cutter for machining Fresnel patterns and a manufacture method of the cutter. A cutter bit of the cutter is a cone with four side walls, a diamond layer with the thickness of 0.2-0.8mm is embedded on the surface of a front cutter face, the front cutter face and side cutter faces incline towards the inner side of the cutter bit from top to bottom to respectively form a first negative deflection angle and a second negative deflection angle together with a vertical line passing through the cutter bit; an auxiliary rear cutter face is formed by linking a first incline and a second incline with different slopes from the cutter bit to the root part of the cutter bit; and the bottom edge of a rear cutter face inclines towards the side cutter faces from the front cutter face to the auxiliary rear cutter face to form a rear cutter face inclination angle. According to the cutter, the strength of the cutter bit is greatly improved, the front cutter face and the side cutter faces incline towards the inner side for a certain angle, the negative deflection angle of the front cutter face is capable of well discharging cuttings, the negative deflection angles of the side cutter faces are capable of avoiding a machining material, thus the refining degree of machined patterns is improved; and the auxiliary rear cutter face is capable of ensuring that a machined face of a workpiece is not touched in a machining process, and thus the quality of the machined patterns is further improved.

Description

technical field [0001] The invention relates to the technical field of optical elements, in particular to a tool for processing Fresnel patterns and a manufacturing method thereof. Background technique [0002] Fresnel micro-optical structural elements have the characteristics of small size, light weight, and easy integration. They have broad application prospects in military and civilian industries. At present, their processing methods include electron beam writing technology, laser beam writing technology, photolithography technology, Etching technology, deposition and image etching technology, LIGA technology, replication technology, coating technology and high-speed milling technology, etc. Each processing method has its own limitations. (1) Photolithography: Due to the limitation of the depth of field, it is limited to the processing of two-dimensional structures and small aspect ratio three-dimensional structures; (2) using sacrificial layer etching technology, althoug...

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Problems solved by technology

Each processing method has its own limitations. (1) Photolithography: Due to the limitation of the depth of field, it is limited to the processing of two-dimensional structures and small aspect ratio three-dimensional structures; (2) using sacrificial layer etching technology, although Quasi-three-dimensional processing can be realized, but it is easy to cause internal stress in the material and affect the final mechanical properties, and the etching technology is affected by the crystal orientation of the material, the processing accuracy is poor, and the quality of the processed surface is poor; (3) LICA technology: LIGA technology must use expensive , The cost of the rare high-collimation X-ray light source is much higher than that of lithography equipment, and it is difficult for general laboratories and enterprises to afford it. At the same time, in principle, it is difficult for LIGA process Machining 3D structures

However, other micro-manufacturing technologies, such as deposition, are generally planar processes, which are difficult to adapt to the processing of three-dimensional structures.

(4) Electron beam writing and laser beam writing technologies are inefficient and difficult to mass produce; (5) Replication technology, including thermocompression molding, compression molding and injection molding, is a low-cost method suitable for mass production. (6) High-speed milling technology, which has high machining accuracy, but it is powerless to process the sharp corners of the tooth shape, and will produce a natural processing fillet slightly larger than the radius of the tool. Theoretically, the smaller the tool, the smaller the processing fillet, but the smaller the tool, the more difficult it is to process, the smaller the tool rigidity, the lower the processing efficiency, the shorter the cutting life of the tool, and the higher the processing cost

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