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 2):
The double point angle drill with intersecting sawtooth structure stated in  claim 1  has characteristics as below: The right-hand and left-hand sawteeth are located at the cutting edges of the double point angle drill with four flutes; The sawteeth cutting zone ( 2 -E) is arranged at the end of four secondary cutting edges ( 2 - 2 ) within the secondary cutting zone ( 2 -B) as well as at the front of four minor cutting edges ( 2 - 3 ) within the minor cutting zone ( 2 -C); The sawteeth cutting zone ( 2 -E) is constructed by sawtooth structure arranged at separate cutting edges; The profiles of sawteeth ( 1 - 1 ) and grooves ( 1 - 2 ) remain the same within one cutting edge.; The number of sawteeth along one cutting edge is  3 - 7 , and the number is identical within all cutting edges; The helix angles of sawteeth ( 1 - 1 ) and grooves ( 1 - 2 ) are different within two adjacent cutting edges while the helix angles of sawteeth ( 1 - 1 ) and grooves ( 1 - 2 ) are identical within two opposite cutting edges; The helix angle ( 2 -\u03b2R) of sawteeth ( 1 - 1 ) on one set of cutting edges are right-hand acute angles larger than 60\u00b0, and the top edges ( 1 - 3 ) perform as cutting edges which are ground into positive rake angles ( 1 -\u03b3 0 u); The helix angle ( 2 -\u03b2L) of sawteeth ( 1 - 1 ) on the other set of cutting edges are left-hand right angle or obtuse angles less than 150\u00b0, and the bottom edges ( 1 - 4 ) perform as cutting edges which are ground into positive rake angles ( 1 -\u03b3 0 d); The above stated right-hand and left-hand sawteeth form the intersecting sawteeth cutting zone ( 2 -E) on two adjacent cutting edges.

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): 0.7464852589563798
- 35 USC 102 Novelty (BERT): 0.5012331876832934
- Combined Prediction Score: 0.7219600518290712
- Mean Citation Score: 243.39680000000004
- Max Citation Score: 256.10825
- Similarity Product: 158.5715710145533

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