Structural Design of Miniature High-Precision Gear Hobbing Cutters

Abstract

A structural design for a miniature high-precision hobbing cutter includes a shaft and a plurality of first cutting edges and a plurality of second cutting edges protruding from the shaft. Each first cutting edge includes a first cutting surface, and each second cutting edge includes a second cutting surface. This invention, by designing the inclination angles of each first cutting surface and each second cutting surface, or by further combining the different sizes of each first cutting edge and each second cutting edge, enables the first cutting edge and each second cutting edge to generate vibrations of different frequencies when the hobbing cutter cuts a workpiece, which cancel each other out. This reduces the vibration during the hobbing cutter's cutting process and improves the precision and surface roughness of the workpiece.

Claims

1. A structural design for a miniature high-precision gear hobbing cutter, comprising: A shaft includes an outer peripheral surface; a plurality of first cutting edges protruding from the outer peripheral surface, each first cutting edge including an outermost first cutting edge and a first cutting surface connected to the first cutting edge, each first cutting edge including a first front end located at one end, the first front end located between the first cutting edge and the first cutting surface, a first forward extension line connecting the first front end of each first cutting edge to the center of the shaft forming a first cutting angle with the first cutting surface; a plurality of second cutting edges protruding from the outer peripheral surface, each second cutting edge including a second cutting edge and a second cutting surface connected to the second cutting edge, each second cutting edge including a second front end located between the second cutting edge and the second cutting surface, a second forward extension line connecting the second front end of each second cutting edge to the center of the shaft forming a second cutting angle with the second cutting surface, the angles of each first cutting angle and each second cutting angle being unequal.

2. The structural design of the miniature high-precision gear hobbing cutter as described in claim 1, wherein, Each second cutting edge is located circumferentially between two adjacent first cutting edges about a rotation axis of the shaft. Each first cutting edge is arranged in a straight line spaced apart from each other along the rotation axis. Each second cutting edge is arranged in a straight line spaced apart from each other along the rotation axis. The first cutting surfaces of each first cutting edge arranged in a straight line are tangent to each other. The second cutting surfaces of each second cutting edge arranged in a straight line are tangent to each other.

3. The structural design of the miniature high-precision hobbing cutter as described in claim 1 or 2, wherein the angle value of each first cutting angle is 0°, and the angle value of the second cutting angle is between 2° and 8°.

4. The structural design of the miniature high-precision hobbing cutter as described in claim 1 or 2, wherein each first cutting edge further includes a first rear end spaced apart from the first front end, each second cutting edge further includes a second rear end spaced apart from the second front end, a first cutting angle is formed between the first front extension line of each first cutting edge and a first rear extension line connecting the first rear end to the center of the shaft, and a second cutting angle is formed between the second front extension line of each second cutting edge and a second rear extension line connecting the second rear end to the center of the shaft, wherein the angle value of each first cutting angle is the same as the angle value of each second cutting angle.

5. The structural design of the miniature high-precision hobbing cutter as described in claim 4, wherein the angle values ​​of the first cutting edge angle and the second cutting edge angle are each between 15° and 25°.

6. The structural design of the miniature high-precision hobbing cutter as described in claim 1 or 2, wherein each first cutting edge further includes a first rear end spaced apart from the first front end, each second cutting edge further includes a second rear end spaced apart from the second front end, a first cutting edge angle is formed between the first front extension line of each first cutting edge and a first rear extension line between the first rear end and the center of the shaft, a second cutting edge angle is formed between the second front extension line of each second cutting edge and a second rear extension line between the second rear end and the center of the shaft, the angle values ​​of each first cutting edge angle are the same, the angle values ​​of each second cutting edge angle are the same, and the angle values ​​of each first cutting edge angle are greater than the angle values ​​of each second cutting edge angle.

7. The structural design of the miniature high-precision hobbing cutter as described in claim 6, wherein the angle values ​​of the first cutting edge angle and the second cutting edge angle are each between 15° and 25°.

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