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 6):
The right-hand stepped drill with sawtooth structure stated in  claim 5  has characteristics as below: The tolerance between the nominal diameter of the Step j of n steps and the nominal diameter of the Step j- 1  is 20% to 40% of the nominal diameter of the Step j, and the j is equal to or larger 2 while equal to or less than n; When j is larger than 2, the tolerance is set at 20% of the nominal diameter of the Step j; The axial length of the stepped minor cutting edges of each stepped structure should be guaranteed to accommodate at least 2 sawteeth; When j equals 1, the point angle of Step j is set at 80\u00b0-100\u00b0; When j is equal to or larger than 2, the point angle of Step j is set at 60\u00b0 -80\u00b0, and the point angle of Step j is smaller than that of Step j- 1 ; The rake angle of primary cutting edges of each stepped structure is ground into fixed value; The margin length of each minor cutting edge is 0.5-1.5 mm; The tool margins on the minor cutting edges of stepped structures are ground into L shapes.

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): 0.7457383563258795
- 35 USC 102 Novelty (BERT): 0.5058105030680571
- Combined Prediction Score: 0.7217455710000973
- Mean Citation Score: 243.39680000000004
- Max Citation Score: 256.10825
- Similarity Product: 145.54077943946422

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