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 1):
A sawtooth structure with reversed cutting function has characteristics as below: The sawtooth structure is constructed by sawteeth ( 1 - 1 ) and grooves ( 1 - 2 ) located on the cutting edges of drill; The sawteeth ( 1 - 1 ) and grooves ( 1 - 2 ) are helically arranged around the drill axis; The sawtooth structure can be divided into left-hand sawtooth structure and right-hand sawtooth structure by the sawtooth helix angle ( 1 -\u03b2); The sawteeth ( 1 - 1 ) with acute helix angle ( 1 -\u03b2) larger than 60\u00b0 are categorized as right-hand sawteeth, and their top edges ( 1 - 3 ) perform as cutting edges that are ground into positive rake angles ( 1 -\u03b3 0 u); The sawteeth ( 1 - 1 ) with right angle or obtuse helix angle ( 1 -\u03b2) less than 150\u00b0 are categorized as left-hand sawteeth, and their bottom edges ( 1 - 4 ) perform as cutting edges that are ground into positive rake angles ( 1 -\u03b3 0 d); The sawtooth structure is located on the cutting edges whose diameters are equal to 0.6 to 1 times of drill diameter, and for stepped drilling structures the sawtooth structure is located at each stepped minor cutting edges; The length of sawteeth ( 1 -Lt) is less than the length of drilling margin while maintaining at least 0.8 mm; The width of grooves ( 1 -Wg) is larger than the thickness of two CFRP laminates and at the same time maintains at least 0.3 mm; The width of sawteeth ( 1 -Wt) is at least 0.5 mm; The depth of grooves ( 1 -Dt) is at least 0.8 mm, and the sawteeth at minimum diameter cannot interfere with the drilling core.

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): 0.7468495311042205
- 35 USC 102 Novelty (BERT): 0.4989974421115242
- Combined Prediction Score: 0.7220643222049509
- Mean Citation Score: 243.39680000000004
- Max Citation Score: 256.10825
- Similarity Product: 164.93598593336344

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