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 7):
The right-hand stepped drill with sawteeth structure stated in  claim 5  has characteristics as below: There are identical sawteeth within sawteeth cutting zone ( 5 -D) of each stepped structure, and the number of micro teeth stays at 2-4; The axial distance between the sawteeth closest to the drill point on each stepped structure and the end of corresponding primary cutting edge is set at 1-1.5 mm; When j is larger than 1 and less than or equal to n, the ratio between width of the grooves of Step j- 1  and that of Step j is 0.6-0.8. Additionally, the ratio between the width of sawteeth of Step j- 1  and that of Step j is 0.5-0.7. When j equals to 2, the width of micro teeth of Step  1  is at least 0.5 mm, and the width of grooves is at least 0.3 mm; The sawteeth ( 1 - 1 ) and the grooves ( 1 - 2 ) are helically arranged around the drill axis, and the helix angle of sawteeth is acute angle larger than 60\u00b0. The bottom edges ( 1 - 3 ) of sawteeth perform as cutting edges, and the rake angle of the edges is ground into positive angle ( 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): 0.7470221829458995
- 35 USC 102 Novelty (BERT): 0.4979369988697095
- Combined Prediction Score: 0.7221136645382805
- Mean Citation Score: 243.39680000000004
- Max Citation Score: 256.10825
- Similarity Product: 167.95476371978222

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