HybridCAD++: Expanded Dataset for Hybrid Additive-Subtractive Manufacturing Feature Recognition in B-Rep CAD Models

The HybridCAD++ dataset is a significantly expanded version of the HybridCAD dataset, offering a larger volume of CAD models and a more comprehensive set of hybrid additive-subtractive manufacturing features. This dataset includes additional feature classes, bringing the total to 36, and contains over 161,000 samples—making it a unique and robust resource for machine learning applications in hybrid manufacturing feature recognition.

Key Differences from HybridCAD:
1. Increased Dataset Volume: HybridCAD++ features a total of 161,441 CAD models, significantly larger than the original HybridCAD dataset.
2. Expanded Feature Classes: This dataset includes 36 feature labels, with newly added classes. This increase in feature variety enhances the dataset's applicability to complex hybrid manufacturing scenarios.

Dataset Composition:
The dataset includes three primary components:

STEP Files:
Each CAD model is stored in STEP format and includes labeled B-Rep faces for hybrid manufacturing feature recognition.
The CAD models were generated programmatically using PythonOCC, ensuring consistent quality and scalability.

Feature Labels:
File: feature_labels.txt
Contains label IDs for each hybrid additive-subtractive feature across B-Rep faces in each CAD model.
With 36 unique feature classes, this file allows precise mapping of CAD model faces to specific hybrid features.

Hierarchical B-Rep Graphs:
Stored in HDF5 format, these graphs provide structured access to B-Rep data, as detailed in h5_structure.txt.

Dataset Splits:
The dataset is divided into three subsets, structured for effective model training and evaluation:
Training Set: 113,008 samples (70%)
Validation Set: 32,288 samples (20%)
Testing Set: 16,145 samples (10%)

Full Feature Label List:
This comprehensive list includes both subtractive and additive manufacturing features, with added classes for more intricate hybrid manufacturing applications:

Label Feature
0 Chamfer
1 Through hole
2 Triangular passage
3 Rectangular passage
4 6-sided passage
5 Triangular through slot
6 Rectangular through slot
7 Circular through slot
8 Rectangular through step
9 2-sided through step
10 Slanted through step
11 O-ring
12 Blind hole
13 Triangular pocket
14 Rectangular pocket
15 6-sided pocket
16 Circular end pocket
17 Rectangular blind slot
18 Vertical circular end blind slot
19 Horizontal circular end blind slot
20 Triangular blind step
21 Circular blind step
22 Rectangular blind step
23 Round
24 Extrude cylinder
25 Extrude rectangle
26 Extrude triangle
27 Extrude hexagon
28 Extrude pentagon
29 Elliptical/Oval blind hole
30 Elliptical/Oval through hole
31 Slot hole
32 Obround boss
33 5-sided passage
34 5-sided pocket
35 Cylinder with hole
36 Stock