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CAD STEP 文件生成工厂 - 基于 PythonOCC (miniconda) 和 FreeCAD 双引擎。支持：方块、圆柱、管材、锥形、齿轮、法兰、装配体等工业级 STEP 文件生成。

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name: step-factory description: CAD STEP 文件生成工厂 - 基于 PythonOCC (miniconda) 和 FreeCAD 双引擎。支持：方块、圆柱、管材、锥形、齿轮、法兰、装配体等工业级 STEP 文件生成。 capabilities:

  • name: make_box description: 生成方块/长方体实心模型 parameters:

    • name: w type: float required: true description: 宽度(mm)
    • name: h type: float required: true description: 高度(mm)
    • name: d type: float required: true description: 厚度(mm) output: STEP文件路径 invoke: type: cli command: "/home/timo/.miniconda/bin/python3 /home/timo/.openclaw/skills/step-factory/scripts/step_occ.py --func make_box --params '{params}'" example: '{"w":120,"h":80,"d":10}'

  • name: make_punched_plate description: 生成矩形打孔板（法兰）- 支持多孔 parameters:

    • name: w type: float required: true description: 宽度(mm)
    • name: h type: float required: true description: 长度(mm)
    • name: thickness type: float required: true description: 厚度(mm)
    • name: hole_rs type: list required: true description: 孔径列表(mm)
    • name: spacing type: list required: true description: 孔间距[x,y] output: STEP文件路径 invoke: type: cli command: "/home/timo/.miniconda/bin/python3 /home/timo/.openclaw/skills/step-factory/scripts/step_occ.py punched_plate {w} {h} {thickness} {hole_rs} {spacing}" example: '{"w":120,"h":80,"thickness":10,"hole_rs":[8],"spacing":[60,40]}'

STEP Factory - CAD 模型生成技能

双引擎架构

  • PythonOCC (首选): /home/timo/.miniconda/bin/python3 - 用于精确 CAD 建模
  • FreeCAD (备选): /usr/bin/freecadcmd - 用于复杂装配和钣金

环境验证

~/.miniconda/bin/python3 -c "from OCC.Core import BRepPrimAPI, STEPControl; print('OCC OK')"

PythonOCC 核心 API

基础形状

from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeBox, BRepPrimAPI_MakeCylinder, BRepPrimAPI_MakeCone, BRepPrimAPI_MakeSphere, BRepPrimAPI_MakeTorus
from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeSolid
from OCC.Core.STEPControl import STEPControl_Writer

布尔运算

from OCC.Core.BoolTools import BoolTools_Common
from OCC.Core.BRepAlgoAPI import BRepAlgoAPI_Cut, BRepAlgoAPI_Fuse, BRepAlgoAPI_Common

导出

writer = STEPControl_Writer()
writer.Transfer(shape, 1)  # 1 = silent mode
writer.Save(filepath)

CAD 功能清单

基础类型（Primitive）

| 类型 | API | 参数 | |

capabilities:

  • name: make_box description: 生成方块/长方体实心模型 parameters:

    • name: w type: float required: true description: 宽度(mm)
    • name: h type: float required: true description: 高度(mm)
    • name: d type: float required: true description: 厚度(mm) output: STEP文件路径 invoke: type: cli command: "/home/timo/.miniconda/bin/python3 /home/timo/.openclaw/skills/step-factory/scripts/step_occ.py --func make_box --params '{params}'" example: '{"w":120,"h":80,"d":10}'

  • name: make_punched_plate description: 生成矩形打孔板（法兰）- 支持多孔 parameters:

    • name: w type: float required: true description: 宽度(mm)
    • name: h type: float required: true description: 长度(mm)
    • name: thickness type: float required: true description: 厚度(mm)
    • name: hole_rs type: list required: true description: 孔径列表(mm)
    • name: spacing type: list required: true description: 孔间距[x,y] output: STEP文件路径 invoke: type: cli command: "/home/timo/.miniconda/bin/python3 /home/timo/.openclaw/skills/step-factory/scripts/step_occ.py punched_plate {w} {h} {thickness} {hole_rs} {spacing}" example: '{"w":120,"h":80,"thickness":10,"hole_rs":[8],"spacing":[60,40]}' ------|-----|------| | box | BRepPrimAPI_MakeBox | W, H, D | | cylinder | BRepPrimAPI_MakeCylinder | R, H | | cone | BRepPrimAPI_MakeCone | bottom_R, top_R, H | | sphere | BRepPrimAPI_MakeSphere | R | | torus | BRepPrimAPI_MakeTorus | major_R, minor_R |

空心/管材

# 管材: 外圆柱 - 内圆柱
outer = BRepPrimAPI_MakeCylinder(outer_r, h).Shape()
inner = BRepPrimAPI_MakeCylinder(inner_r, h).Shape()
tube = BRepAlgoAPI_Cut(outer, inner).Shape()

法兰

outer = BRepPrimAPI_MakeCylinder(outer_r, thickness).Shape()
hole = BRepPrimAPI_MakeCylinder(hole_r, thickness + 2).Shape()
flange = BRepAlgoAPI_Cut(outer, hole).Shape()

锥管

cone = BRepPrimAPI_MakeCone(bottom_r, top_r, h).Shape()
# 切内孔
inner = BRepPrimAPI_MakeCone(inner_bottom_r, inner_top_r, h + 1).Shape()
tapered_tube = BRepAlgoAPI_Cut(cone, inner).Shape()

多级轴

segments = [(r1, h1), (r2, h2), ...]
shapes = []
y = 0
for r, h in segments:
    cyl = BRepPrimAPI_MakeCylinder(r, h).Shape()
    # translate
    from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_Transform
    from OCC.Core.gp import gp_Vec, gp_Trsf
    trsf = gp_Trsf()
    trsf.SetTranslation(gp_Vec(0, y, 0))
    shapes.append(BRepBuilderAPI_Transform(cyl, trsf).Shape())
    y += h
# fuse all

齿轮

# 渐开线齿轮 - 需要较复杂建模
# 简化: 用圆环代替齿轮
gear = BRepPrimAPI_MakeCylinder(external_r, thickness).Shape()

钣金折弯

# 用 FreeCAD 做钣金更方便

输出目录

  • /home/timo/STEP

执行方式

通过 exec 工具运行 ~/.miniconda/bin/python3 脚本

已有 STEP 文件分类参考

Demo 系列（100个基础测试件）

  • demo1_50x50x50 - 50³ 方块
  • demo2_r20h60 - R20×H60 圆柱
  • demoN_orXirYhZ - 外径X/内径Y/高度Z 空心管
  • demoN_rXhY - 半径X/高度Y 圆柱

Test 系列（20个复杂件）

  • test1_box_with_hole - 带孔方块
  • test2_threaded_counterbore - 螺纹埋头孔
  • test3_hex_prism_with_features - 六角棱柱带特征
  • test5_shaft_with_steps - 多级轴
  • test7_sheet_metal_bend - 钣金折弯

CNC 测试系列

  • cnc_test_thin_wall - 薄壁加工
  • cnc_test_deep_slot - 深槽加工
  • cnc_test_precision_holes - 精密孔加工
  • cnc_test_thread - 螺纹加工
  • five_axis_turbine_blade - 五轴叶轮

3D打印系列

  • print3d_nurbs_ultraman - NURBS 曲面
  • print3d_robot_hand_fixed - 机器人手
  • print3d_assembly_gap_block/pin - 配合测试

PythonOCC 生成的样件

  • occ_box_50x50x50.step - OCC 方块
  • occ_cylinder_r25h100.step - OCC 圆柱
  • occ_tube_r40r10h80.step - OCC 管材

执行流程

  1. 解析用户输入（图片识别 → 参数提取 / 直接参数描述）
  2. 确定 CAD 类型和参数
  3. 生成 PythonOCC 脚本
  4. 执行 ~/.miniconda/bin/python3 script.py
  5. 验证输出 STEP 文件
  6. 返回文件路径

Capabilities (供Orchestrator编排器使用)

capabilities:
capabilities:
  - name: make_box
    description: 生成方块/长方体实心模型
    parameters:
      - name: w
        type: float
        required: true
        description: 宽度(mm)
      - name: h
        type: float
        required: true
        description: 高度(mm)
      - name: d
        type: float
        required: true
        description: 厚度(mm)
    output: STEP文件路径
    example: '{"w":120,"h":80,"d":10}'
    call: "/home/timo/.miniconda/bin/python3 -c \"from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeBox; from OCC.Core.STEPControl import STEPControl_Writer; s=BRepPrimAPI_MakeBox(120,80,10).Shape(); w=STEPControl_Writer(); w.Transfer(s,1); w.Write('/home/timo/STEP/box.step')\""

  - name: make_punched_plate
    description: 生成矩形打孔板（法兰）- 支持多孔
    parameters:
      - name: w
        type: float
        required: true
        description: 宽度(mm)
      - name: h
        type: float
        required: true
        description: 长度(mm)
      - name: thickness
        type: float
        required: true
        description: 厚度(mm)
      - name: hole_rs
        type: list
        required: true
        description: 孔径列表(mm)
      - name: spacing
        type: list
        required: true
        description: 孔间距[x,y]
    output: STEP文件路径
    example: '{"w":120,"h":80,"thickness":10,"hole_rs":[8],"spacing":[60,40]}'
    call: "/home/timo/.miniconda/bin/python3 /home/timo/.openclaw/skills/step-factory/scripts/step_occ.py --func make_punched_plate --params '{\"w\":120,\"h\":80,\"thickness\":10,\"hole_rs\":[8],\"spacing\":[60,40]}'"