PATENT CLAIM ANALYSIS

Application Number: 15750677
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2018-09
Patent Classification: ["408", "224000"]

Abstract:
A kind of sawtooth structure with reversed cutting function and its drill series are specifically fitted for drilling carbon fiber reinforced polymers (CFRP). The sawtooth structure is constructed by sawteeth and grooves located on the cutting edges of drill. And the sawtooth structure is helically arranged with a large helix angle around the axis of the drill. It can be divided into left-hand sawtooth structure and right-hand sawtooth structure by the helix angle. The bottom edges of the left-hand sawtooth function as cutting edges, and the rake angles are positive, while the top edges of the right-hand sawtooth are ground as positive rake angles. The sawtooth structure can be applied into multiple drilling tools, which proves to be universal. And it can effectively reduce delamination at both hole entry and hole exit as well as burrs defects. The series of drilling tools are double point angle drill, twist drill and stepped drill with sawtooth structure on the cutting edges. And such forms of drilling tools can achieve hole drilling of CFRP with minimum drilling defects. The drilling performance of the tools is thus improved to a great extent, and the tool life is extended while maintaining low usage costs.

Claim (Index 4):
The right-hand twist drill with sawtooth structure stated in  claim 1  has characteristics as below: The right-hand sawteeth are arranged on the minor cutting edges; The point angle ( 4 -\u03b1) of the drill is 85\u00b0-90\u00b0, and the length of the chisel edge is 0.1-0.6 mm. The rake angle ( 4 -\u03b3 0 ) of the primary cutting edges is ground into fixed value and the rake angle ( 4 -\u03b3 0 ) is 15\u00b0-20\u00b0. The first flank angle ( 4 -\u03b1 1 ) on the primary cutting edges ( 4 - 1 ) is 10\u00b0 - 12 \u00b0 and the second flank angle ( 4 -\u03b1 2 ) on the primary cutting edges ( 4 - 1 ) is 15\u00b0-25\u00b0. The area of the second flank face ( 4 - 8 ) is 3 to 5 times larger than the area of the first flank face ( 4 - 7 ); The helix angle of the flutes is  30 \u00b0 - 34 \u00b0 ; The sawteeth cutting zone ( 4 -D) is located at the minor cutting edges ( 4 - 2 ) within the minor cutting zone ( 4 -B); The number of sawteeth ( 1 - 1 ) along every minor cutting edge ( 4 - 2 ) is 3-5 and the number is identical among all the minor cutting edges ( 4 - 2 ) as well; The distance ( 4 - d ) between the sawteeth closest to the drill bit and the primary cutting zone ( 4 -A) is 1-1.5 mm; The sawteeth ( 1 - 1 ) and the grooves ( 1 - 2 ) are helically arranged around the drill axis ( 4 - 4 ) and the sawteeth helix angle ( 1 -\u03b2) is acute angle larger than 60\u00b0; The top edges ( 1 -\u03b2) of the sawteeth perform as cutting edges that are ground into positive rake angles ( 1 -\u03b3 0 u).

Metadata:
- Claim Count in Document: 13.0
- Percentile: 88.0
- Lexical Diversity: 2.16
- Patent Class: 408.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['13643303', '10935398', '14128140', '14369175', '10914111']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7472866473509613
- 35 USC 102 Novelty (BERT): 0.4963118330163145
- Combined Prediction Score: 0.7221891659174966
- Mean Citation Score: 243.39680000000004
- Max Citation Score: 256.10825
- Similarity Product: 172.58118512481448

Labels:
- Claim Label 101: 1
- Claim Label 102: 1
- Claim Label 103: 1
- Claim Label 112: 0
- Combined Label: 1
- Label 101 Adjusted: 1

Dataset: test