PATENT CLAIM ANALYSIS

Application Number: 15756024
Application Type: Utility
Filing Date: 2018-02
Publication Date: 2019-01
Patent Classification: ["164", "515000"]

Abstract:
The invention provides an electroslag fusion process for manufacturing a blade slab having a large curved surface, and it is more particularly effectively in making a blade slab which has a big width-to-thickness ratio, a large difference between the thin and the thick edges and a large curved surface. Firstly, dividing the blade slab into two or three regions according to the external shape and the sectional size of the blade slab, wherein the region which has difficulty in unilateral or bilateral mold-filling is pre-fabricated by the electroslag casting technology to produce a pre-fabricated curved slab, and then it is placed in advance in a side of an internal cavity of a mold, and then fusing the molten metal melted from a consumable electrode and one or two electroslag pre-fabricated slabs which are placed in advance in the mold by utilizing the electroslag fusion process, so as to produce the blade slab having a large curved surface. The large curved blade slab prepared by the process of the present invention has good internal and surface qualities, which can improve material utilization rate, shorten the processing period and improve quality, and in particular, has high anti-fatigue performance, high crack resistance and extensibility performances. The process of the present invention is more suitable for producing large or very large curved blade slab castings having a width-to-thickness ratio >10 and a single weight over 10 tons.

Claim (Index 2):
The electroslag fusion process, as recited in  claim 1 , wherein the specific steps for the electroslag fusion process are as follows:\n (1) controlling the main components and the content of the electroslag fusion system to be as follows: mass percentage of CaF 2 : 50-62%, Al 2 O 3 : 25-35%, CaO: 3-8% and a trace component: no more than 5% of the total mass of the electroslag fusion system, so as to define a multi-element electroslag fusion system, wherein the trace component is one or more of MgO, SiO 2  and TiO 2 , and the thickness of the slag layer is 12 to 25% of the equivalent diameter of the curved blade slab mold; (2) the process parameters of the electroslag fusion process are as follows: voltage: 70\u02dc120V, current density: 20000\u02dc60000 A/m 2 ; (3) the feeding process: employing the intermittent feeding, in feeding period, firstly lowing the normal current to a minimum feeding current within 2 to 5 minutes at a constant speed, maintaining for 1 to 2 minutes; and then rising the current from the minimum feeding current to 70 to 80% of the normal casting current within 3 minutes at a constant speed, repeating the cycle 4 to 5 times, and each time the maximum current is 70 to 80% of the previous maximum current, and at the last time, reducing the current to zero.

Metadata:
- Claim Count in Document: 9.0
- Percentile: 88.0
- Lexical Diversity: 2.21239
- Patent Class: 164.0
- Transitional Phrase Type: none
- Component Type: 0
- Foreign Priority: True
- Related Applications: ['13571708', '10158382', '12450290', '12297984', '13148395']

Analysis Scores:
- 35 USC 101 Eligibility (BERT): 0.7671655604088397
- 35 USC 102 Novelty (BERT): 0.5075356501285704
- Combined Prediction Score: 0.7412025693808127
- Mean Citation Score: 150.43802799999995
- Max Citation Score: 169.0786
- Similarity Product: 87.76917667746544

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

Dataset: test