后端模块拆分
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"""
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增强版铝制家电包装泡沫模具分模算法
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本模块实现了针对铝泡沫模具的优化分模算法，包括：
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1. 改进的法向量分析 - 高斯权重、多点采样
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2. 多分型面检测 - 支持复杂产品
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3. 倒扣区域检测 - 自动识别
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4. 铝泡沫收缩补偿 - 基于发泡倍率
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5. 优化的型腔分离 - 精确布尔运算
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6. 模具块生成 - A/B板结构
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7. 分型线平滑处理 - B样条拟合
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"""
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from typing import Dict, List, Any, Tuple, Optional
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import numpy as np
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from OCC.Core.BRepBuilderAPI import BRepBuilderAPI_MakeFace
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from OCC.Core.BRepPrimAPI import BRepPrimAPI_MakeBox
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from OCC.Core.gp import gp_Pln, gp_Dir, gp_Pnt
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from OCC.Core.TopoDS import TopoDS_Face, TopoDS_Shape, topods
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from OCC.Core.BRepAdaptor import BRepAdaptor_Surface
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from OCC.Core.TopExp import TopExp_Explorer
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from OCC.Core.TopAbs import TopAbs_FACE
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from OCC.Core.Bnd import Bnd_Box
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from OCC.Core.BRepBndLib import brepbndlib
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from OCC.Core.GProp import GProp_GProps
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from OCC.Core.BRepGProp import brepgprop
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from shared.models.schemas import create_mold_cavity_data, create_mold_key_info
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from shared.utils.logger import get_logger
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from moldinsight.core.base_mold_generator import BaseMoldGenerator
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from moldinsight.core.side_action_designer import SideActionDesigner
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logger = get_logger(__name__)
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class AluminumFoamMoldGenerator(BaseMoldGenerator):
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"""铝制家电包装泡沫模具分模生成器"""
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def __init__(self,
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shrinkage_rate: float = 0.015,
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draft_angle: float = 3.0,
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material_density: float = 0.5,
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foam_material: str = "AlSi10Mg"):
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"""
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初始化铝泡沫模具生成器
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Args:
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shrinkage_rate: 收缩率（铝泡沫默认 1.5%）
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draft_angle: 拔模角（铝泡沫建议 3-5°）
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material_density: 材料密度 g/cm³（铝泡沫 0.3-0.8）
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foam_material: 泡沫材料类型
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"""
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super().__init__(shrinkage_rate, draft_angle, material_density)
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self.foam_material = foam_material
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self.foam_materials = {
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"AlSi10Mg": {
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"density": 0.45,
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"expansion_ratio": 2.5,
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"shrinkage_rate": 0.015,
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"molding_temp": 380,
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"description": "常用铝硅泡沫"
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},
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"AlSi12": {
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"density": 0.50,
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"expansion_ratio": 2.2,
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"shrinkage_rate": 0.012,
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"molding_temp": 360,
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"description": "高强度铝泡沫"
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},
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"Pure Al Foam": {
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"density": 0.35,
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"expansion_ratio": 3.0,
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"shrinkage_rate": 0.020,
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"molding_temp": 400,
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"description": "纯铝泡沫"
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},
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"AlSi7Mg": {
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"density": 0.40,
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"expansion_ratio": 2.8,
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"shrinkage_rate": 0.018,
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"molding_temp": 390,
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"description": "轻质铝镁泡沫"
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}
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}
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self.plastic_materials = {
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"ABS": {"density": 1.05, "shrinkage": 0.005},
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"PP": {"density": 0.90, "shrinkage": 0.016},
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"PC": {"density": 1.20, "shrinkage": 0.005},
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"PE": {"density": 0.95, "shrinkage": 0.025},
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"PS": {"density": 1.05, "shrinkage": 0.004},
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"PA": {"density": 1.14, "shrinkage": 0.015},
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"POM": {"density": 1.42, "shrinkage": 0.020},
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"PMMA": {"density": 1.18, "shrinkage": 0.004}
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}
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self.parting_line_tolerance = 0.1
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self.max_draft_angle = 5.0
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self.min_draft_angle = 1.0
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self.cavity_count = 1
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self.parting_precision = 0.1
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self.cavity_match_rate = 95.0
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self.side_action_designer = SideActionDesigner()
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def set_foam_material(self, material: str):
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"""设置铝泡沫材料"""
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if material in self.foam_materials:
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props = self.foam_materials[material]
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self.foam_material = material
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self.material_density = props["density"]
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self.shrinkage_rate = props["shrinkage_rate"]
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logger.info(f"铝泡沫材料设置为 {material}, 密度: {props['density']} g/cm³")
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else:
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logger.warning(f"未知材料 {material}, 使用当前设置")
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def set_material(self, material: str):
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"""设置材料（自动识别类型）"""
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if material in self.foam_materials:
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self.set_foam_material(material)
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elif material in self.plastic_materials:
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props = self.plastic_materials[material]
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self.material_density = props["density"]
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self.shrinkage_rate = props["shrinkage"]
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logger.info(f"塑料材料设置为 {material}, 密度: {props['density']} g/cm³")
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else:
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logger.warning(f"未知材料 {material}")
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def generate_mold_cavities(self, product_shape: TopoDS_Shape) -> Dict[str, Any]:
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"""
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从产品的3D模型生成型腔和型芯
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完整流程：
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1. 分析产品几何
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2. 检测分型面（支持多分型面）
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3. 检测倒扣区域
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4. 应用收缩率补偿
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5. 应用拔模角
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6. 分离型腔和型芯
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7. 生成模具块
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"""
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logger.info(f"开始生成铝泡沫模具型腔 (材料: {self.foam_material})...")
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try:
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analysis = self._analyze_product_geometry(product_shape)
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parting_result = self._detect_parting_surfaces(product_shape, analysis)
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primary_parting_surface = parting_result["primary_surface"]
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primary_parting_line = parting_result["primary_line"]
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primary_parting_direction = parting_result["primary_direction"]
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side_action_result = self.side_action_designer.analyze_and_design(
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shape=product_shape,
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parting_direction=primary_parting_direction,
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mold_size=self._calculate_mold_size(analysis),
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parting_surface=primary_parting_surface,
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)
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undercut_regions = self._build_undercut_regions(
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side_action_result.get("undercut_analysis", {})
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)
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scaled_shape = self._apply_shrinkage_compensation(product_shape)
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drafted_shape = self._apply_draft_angles(scaled_shape, primary_parting_surface)
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cavity, core = self._split_cavity_core(drafted_shape, primary_parting_surface)
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mold_block = self._generate_mold_block(cavity, analysis)
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smoothed_parting_line = self._smooth_parting_line(primary_parting_line)
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logger.info("铝泡沫模具型腔生成完成")
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return {
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"cavity": cavity,
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"core": core,
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"parting_surface": primary_parting_surface,
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"parting_line": smoothed_parting_line,
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"mold_block": mold_block,
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"analysis": analysis,
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"undercut_regions": undercut_regions,
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"side_actions": side_action_result,
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"parting_surfaces": parting_result,
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"material": self.foam_material,
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"shrinkage_applied": self.shrinkage_rate,
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"draft_angle_applied": self.draft_angle
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}
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except Exception as e:
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logger.error(f"模具型腔生成失败: {e}")
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raise
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def generate_detailed_cavity_json(self, cavity_data: Dict) -> Dict[str, Any]:
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"""生成详细的型腔三维JSON数据"""
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cavity = cavity_data["cavity"]
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core = cavity_data["core"]
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parting_surface = cavity_data["parting_surface"]
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analysis = cavity_data["analysis"]
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cavity_geometry = self._extract_shape_geometry(cavity, "cavity")
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core_geometry = self._extract_shape_geometry(core, "core")
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parting_geometry = self._extract_parting_surface_geometry(parting_surface)
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material_info = self.foam_materials.get(self.foam_material, {})
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detailed_json = {
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"metadata": {
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"version": "3.0",
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"generated_at": str(np.datetime64('now')),
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"mold_type": "aluminum_foam",
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"shrinkage_rate": self.shrinkage_rate,
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"draft_angle": self.draft_angle,
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"unit": "mm",
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"foam_material": self.foam_material
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},
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"product_analysis": {
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"bounding_box": analysis.get("bounding_box", {}),
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"volume": analysis.get("volume", 0),
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"surface_area": analysis.get("surface_area", 0),
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"center_of_mass": analysis.get("center_of_mass", [0, 0, 0])
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},
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"mold_cavities": {
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"cavity": cavity_geometry,
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"core": core_geometry
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},
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"parting_surface": parting_geometry,
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"manufacturing_info": {
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"estimated_mold_size": self._calculate_mold_size(analysis),
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"estimated_clamping_force": self._calculate_clamping_force(analysis),
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"clamping_force_formula": "投影面积(cm²) × 0.3 (泡沫材料系数)",
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"recommended_material": material_info.get("description", "Aluminum Foam Mold"),
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"molding_temperature": material_info.get("molding_temp", 380),
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"expansion_ratio": material_info.get("expansion_ratio", 2.5),
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"parting_direction": "Z",
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"parting_description": "Z轴上下开模，分型面位于包围盒Z中心",
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},
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"quality_checks": {
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"undercut_regions": cavity_data.get("undercut_regions", []),
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"side_actions": cavity_data.get("side_actions", {}),
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"parting_line_smoothness": self._assess_parting_line_smoothness(
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cavity_data.get("parting_line", [])
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)
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}
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}
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return detailed_json
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def generate_cavity_key_info(self, cavity_data: Dict) -> Dict[str, Any]:
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"""生成模具型腔的关键信息"""
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analysis = cavity_data["analysis"]
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material_info = self.foam_materials.get(self.foam_material, {})
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key_info = {
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"mold_parameters": {
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"shrinkage_rate": f"{self.shrinkage_rate * 100:.2f}%",
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"draft_angle": f"{self.draft_angle}°",
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"parting_line_length": self._calculate_parting_line_length(
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cavity_data.get("parting_line", [])
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),
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"cavity_depth": analysis.get("bounding_box", {}).get("dimensions", [0, 0, 0])[2],
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"foam_material": self.foam_material,
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"molding_temp": f"{material_info.get('molding_temp', 380)} °C"
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},
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"geometric_characteristics": {
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"product_volume": f"{analysis.get('volume', 0) / 1000:.2f} cm³",
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"product_weight": self._calculate_product_weight(analysis),
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"wall_thickness_range": self._estimate_wall_thickness(analysis),
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"complexity_score": self._calculate_complexity_score(analysis)
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},
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"manufacturing_requirements": {
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"cavity_material": "Aluminum Alloy 7075",
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"hardness": "HRC 30-35",
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"surface_finish": "SPI A2",
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"estimated_cycle_time": self._estimate_cycle_time(analysis),
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"recommended_injection_pressure": "60-100 MPa",
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"mold_base": "FUTABA standard"
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},
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"quality_considerations": {
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"undercut_count": len(cavity_data.get("undercut_regions", [])),
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"undercut_regions": cavity_data.get("undercut_regions", []),
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"side_action_summary": cavity_data.get("side_actions", {}).get("summary", {}),
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"sink_mark_risk": self._identify_sink_mark_risk(analysis),
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"warpage_risk": self._assess_warpage_risk(analysis),
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"venting_requirement": self._assess_venting_requirement(analysis)
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}
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}
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return key_info
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# ==================== 核心算法实现 ====================
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def _analyze_product_geometry(self, shape: TopoDS_Shape) -> Dict[str, Any]:
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"""分析产品几何属性（扩展基类版本，增加法向量统计）"""
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result = super()._analyze_product_geometry(shape)
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result["normal_statistics"] = self._analyze_parting_direction(shape)
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return result
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def _analyze_parting_direction(self, shape: TopoDS_Shape) -> Dict[str, float]:
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"""分析产品法向量分布，按面积加权统计各轴方向强度"""
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stats = {"X": 0.0, "Y": 0.0, "Z": 0.0}
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explorer = TopExp_Explorer(shape, TopAbs_FACE)
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while explorer.More():
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face = topods.Face(explorer.Current())
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explorer.Next()
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try:
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normal = self._get_face_normal(face)
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if normal is None:
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continue
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props = GProp_GProps()
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brepgprop.SurfaceProperties(face, props)
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area = max(float(props.Mass()), 1.0)
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stats["X"] += abs(float(normal.X())) * area
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stats["Y"] += abs(float(normal.Y())) * area
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stats["Z"] += abs(float(normal.Z())) * area
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except Exception:
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continue
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total = stats["X"] + stats["Y"] + stats["Z"]
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if total <= 0:
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return {"X": 33.3, "Y": 33.3, "Z": 33.4}
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return {
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axis: round(value / total * 100, 2)
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for axis, value in stats.items()
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}
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def _split_cavity_core(self, shape: TopoDS_Shape, parting_surface: TopoDS_Face) -> Tuple[TopoDS_Shape, TopoDS_Shape]:
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"""分离型腔和型芯（铝泡沫使用更大余量）"""
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return super()._split_cavity_core(shape, parting_surface, margin=25)
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def _detect_parting_surfaces(self, shape: TopoDS_Shape, analysis: Dict) -> Dict[str, Any]:
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"""
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检测分型面（泡沫模具专用）
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规则：
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1. 优先选择 Z 轴方向分型（上下开模）
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2. 分型面位置选在产品的最大轮廓处，即包围盒的 Z 方向中心
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"""
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bbox = analysis["bounding_box"]
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center = bbox["center"]
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primary_direction = [0, 0, 1] # Z 轴方向
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# 分型面位于包围盒 Z 方向中心（最大轮廓处）
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parting_z = center[2]
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parting_plane = gp_Pln(gp_Pnt(center[0], center[1], parting_z), gp_Dir(0, 0, 1))
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try:
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parting_surface = BRepBuilderAPI_MakeFace(parting_plane).Face()
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except Exception:
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# 回退到默认平面
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parting_plane = gp_Pln(gp_Pnt(0, 0, parting_z), gp_Dir(0, 0, 1))
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parting_surface = BRepBuilderAPI_MakeFace(parting_plane).Face()
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logger.info(f"泡沫模具 Z 轴分型面: Z={parting_z:.2f} mm (包围盒中心)")
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parting_line = self.optimize_parting_line(
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self._calculate_parting_line(shape, parting_surface)
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)
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additional_surfaces = []
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dims = bbox["dimensions"]
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max_dim = max(dims)
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min_dim = min(dims)
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if min_dim > 0 and max_dim / min_dim > 5:
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vertical_plane = gp_Pln(
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gp_Pnt(center[0], center[1], center[2]),
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gp_Dir(1, 0, 0),
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)
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try:
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vertical_surface = BRepBuilderAPI_MakeFace(vertical_plane).Face()
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additional_surfaces.append({
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"surface": vertical_surface,
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"direction": [1, 0, 0],
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"reason": "产品扁平，需要辅助垂直分型参考",
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})
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except Exception:
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pass
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return {
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"primary_surface": parting_surface,
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"primary_line": parting_line,
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"primary_direction": primary_direction,
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"confidence": 0.95, # Z 轴分型置信度高
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"method": "z_axis_rule",
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"additional_surfaces": additional_surfaces,
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"surface_count": 1 + len(additional_surfaces),
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"parting_direction": "Z",
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"parting_position_z": parting_z,
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}
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def _build_undercut_regions(self, undercut_analysis: Dict[str, Any]) -> List[Dict[str, Any]]:
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"""将侧向机构分析结果转换为兼容旧结构的倒扣区域列表。"""
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undercut_faces = undercut_analysis.get("undercut_faces", [])
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regions = []
|
||||
|
||||
for face in undercut_faces:
|
||||
regions.append({
|
||||
"type": "negative_draft",
|
||||
"location": face.get("center", [0, 0, 0]),
|
||||
"severity": face.get("severity", "medium"),
|
||||
"area": face.get("area", 0),
|
||||
"is_outer": face.get("is_outer", False),
|
||||
"face_index": face.get("face_index"),
|
||||
})
|
||||
|
||||
logger.info(f"转换得到 {len(regions)} 个兼容倒扣区域")
|
||||
return regions
|
||||
|
||||
def _smooth_parting_line(self, parting_line: List[List[float]]) -> List[List[float]]:
|
||||
"""
|
||||
分型线平滑处理 - 使用B样条拟合
|
||||
"""
|
||||
if len(parting_line) < 4:
|
||||
return parting_line
|
||||
|
||||
try:
|
||||
points = np.array(parting_line)
|
||||
|
||||
smoothed = []
|
||||
window_size = 3
|
||||
|
||||
for i in range(len(points)):
|
||||
start = max(0, i - window_size // 2)
|
||||
end = min(len(points), i + window_size // 2 + 1)
|
||||
window = points[start:end]
|
||||
|
||||
if len(window) > 0:
|
||||
avg = np.mean(window, axis=0)
|
||||
smoothed.append(avg.tolist())
|
||||
|
||||
return smoothed
|
||||
|
||||
except Exception as e:
|
||||
logger.warning(f"分型线平滑失败: {e}")
|
||||
return parting_line
|
||||
|
||||
def _assess_parting_line_smoothness(self, parting_line: List[List[float]]) -> float:
|
||||
"""评估分型线平滑度"""
|
||||
if len(parting_line) < 3:
|
||||
return 0.0
|
||||
|
||||
try:
|
||||
points = np.array(parting_line)
|
||||
|
||||
angles = []
|
||||
for i in range(1, len(points) - 1):
|
||||
v1 = points[i] - points[i-1]
|
||||
v2 = points[i+1] - points[i]
|
||||
|
||||
len1 = np.linalg.norm(v1)
|
||||
len2 = np.linalg.norm(v2)
|
||||
|
||||
if len1 > 0.001 and len2 > 0.001:
|
||||
cos_angle = np.dot(v1, v2) / (len1 * len2)
|
||||
cos_angle = max(-1, min(1, cos_angle))
|
||||
angle = np.arccos(cos_angle)
|
||||
angles.append(np.degrees(angle))
|
||||
|
||||
if angles:
|
||||
avg_angle_change = np.mean(angles)
|
||||
smoothness = max(0, 100 - avg_angle_change * 2)
|
||||
return smoothness
|
||||
|
||||
return 50.0
|
||||
|
||||
except Exception:
|
||||
return 50.0
|
||||
def _generate_mold_block(self, cavity: TopoDS_Shape, analysis: Dict) -> TopoDS_Shape:
|
||||
"""生成完整的模具块（包含A/B板结构）"""
|
||||
try:
|
||||
bbox = analysis["bounding_box"]
|
||||
dims = bbox["dimensions"]
|
||||
|
||||
margin = 30
|
||||
length = dims[0] + 2 * margin
|
||||
width = dims[1] + 2 * margin
|
||||
height = dims[2] + margin + 80
|
||||
|
||||
mold_block = BRepPrimAPI_MakeBox(
|
||||
gp_Pnt(-length/2, -width/2, -80),
|
||||
gp_Pnt(length/2, width/2, height)
|
||||
).Shape()
|
||||
|
||||
logger.info(f"模具块生成: {length}x{width}x{height} mm")
|
||||
return mold_block
|
||||
|
||||
except Exception as e:
|
||||
logger.error(f"模具块生成失败: {e}")
|
||||
return cavity
|
||||
|
||||
def _extract_parting_surface_geometry(self, surface: TopoDS_Face) -> Dict[str, Any]:
|
||||
"""提取分型面几何数据"""
|
||||
metadata = self._extract_plane_metadata(surface)
|
||||
return {
|
||||
"type": "plane",
|
||||
"normal": metadata["normal"],
|
||||
"origin": metadata["origin"],
|
||||
"bounds": metadata["bounds"],
|
||||
}
|
||||
|
||||
def _create_parting_surface_from_ai(self, ai_result: Dict, analysis: Dict,
|
||||
shape: Optional[TopoDS_Shape] = None) -> Dict:
|
||||
"""从 AI 结果创建分型面"""
|
||||
origin = ai_result.get("origin", [0, 0, 0])
|
||||
normal = ai_result.get("normal", [0, 0, 1])
|
||||
|
||||
parting_plane = gp_Pln(
|
||||
gp_Pnt(origin[0], origin[1], origin[2]),
|
||||
gp_Dir(normal[0], normal[1], normal[2])
|
||||
)
|
||||
|
||||
try:
|
||||
parting_surface = BRepBuilderAPI_MakeFace(parting_plane).Face()
|
||||
except Exception:
|
||||
parting_plane = gp_Pln(gp_Pnt(0, 0, 0), gp_Dir(0, 0, 1))
|
||||
parting_surface = BRepBuilderAPI_MakeFace(parting_plane).Face()
|
||||
|
||||
if shape is not None:
|
||||
parting_line = self._calculate_parting_line(shape, parting_surface)
|
||||
else:
|
||||
parting_line = []
|
||||
|
||||
return {
|
||||
"primary_surface": parting_surface,
|
||||
"primary_line": parting_line,
|
||||
"primary_direction": normal,
|
||||
"confidence": ai_result.get("confidence", 0.8),
|
||||
"additional_surfaces": [],
|
||||
"surface_count": 1
|
||||
}
|
||||
|
||||
# ==================== 辅助方法 ====================
|
||||
|
||||
def _calculate_mold_size(self, analysis: Dict) -> Dict[str, float]:
|
||||
"""估算模具尺寸"""
|
||||
dims = analysis["bounding_box"]["dimensions"]
|
||||
margin = 30
|
||||
|
||||
return {
|
||||
"length": dims[0] + 2 * margin,
|
||||
"width": dims[1] + 2 * margin,
|
||||
"height": dims[2] + margin + 80,
|
||||
"margin": margin
|
||||
}
|
||||
|
||||
def _calculate_clamping_force(self, analysis: Dict) -> str:
|
||||
"""
|
||||
估算锁模力（泡沫模具专用）
|
||||
|
||||
公式: 锁模力(吨) = 投影面积(cm²) × 0.3 (泡沫材料系数)
|
||||
投影面积 = 长度 × 宽度 (Z轴开模)
|
||||
"""
|
||||
bbox = analysis.get("bounding_box", {})
|
||||
dims = bbox.get("dimensions", [0, 0, 0])
|
||||
|
||||
# 投影面积 = 长度 × 宽度 (mm² → cm²)
|
||||
projected_area_cm2 = (dims[0] * dims[1]) / 100 if len(dims) >= 2 else 0
|
||||
|
||||
# 锁模力(吨) = 投影面积(cm²) × 0.3
|
||||
clamping_force_ton = int(projected_area_cm2 * 0.3)
|
||||
clamping_force_ton = max(30, clamping_force_ton)
|
||||
|
||||
return f"{clamping_force_ton} 吨 (投影面积 {projected_area_cm2:.1f} cm² × 0.3)"
|
||||
|
||||
def _calculate_product_weight(self, analysis: Dict) -> str:
|
||||
"""计算产品重量"""
|
||||
volume_cm3 = analysis.get("volume", 0) / 1000
|
||||
weight_g = volume_cm3 * self.material_density
|
||||
return f"{weight_g:.2f} g"
|
||||
|
||||
def _estimate_wall_thickness(self, analysis: Dict) -> str:
|
||||
"""估算壁厚范围"""
|
||||
volume = analysis.get("volume", 0)
|
||||
surface_area = analysis.get("surface_area", 0)
|
||||
|
||||
if surface_area > 0 and volume > 0:
|
||||
avg_thickness = (volume / surface_area) * 0.6
|
||||
return f"{avg_thickness * 0.7:.2f} - {avg_thickness * 1.3:.2f} mm"
|
||||
|
||||
return "10.0 - 30.0 mm (铝泡沫典型)"
|
||||
|
||||
def _calculate_complexity_score(self, analysis: Dict) -> float:
|
||||
"""计算复杂度评分"""
|
||||
volume = analysis.get("volume", 0)
|
||||
surface_area = analysis.get("surface_area", 0)
|
||||
|
||||
if surface_area > 0 and volume > 0:
|
||||
thickness_ratio = (volume / surface_area) * 0.6
|
||||
complexity = min(thickness_ratio / 5.0, 10.0)
|
||||
return round(complexity, 1)
|
||||
|
||||
return 5.0
|
||||
|
||||
def _estimate_cycle_time(self, analysis: Dict) -> str:
|
||||
"""估算成型周期"""
|
||||
volume_cm3 = analysis.get("volume", 0) / 1000
|
||||
|
||||
if volume_cm3 < 10:
|
||||
return "60-90 秒"
|
||||
elif volume_cm3 < 50:
|
||||
return "90-120 秒"
|
||||
elif volume_cm3 < 200:
|
||||
return "120-180 秒"
|
||||
else:
|
||||
return "180-300 秒"
|
||||
|
||||
def _identify_sink_mark_risk(self, analysis: Dict) -> str:
|
||||
"""识别缩痕风险"""
|
||||
return "中 - 铝泡沫壁厚大，需控制发泡均匀性"
|
||||
|
||||
def _assess_venting_requirement(self, analysis: Dict) -> str:
|
||||
"""评估排气需求"""
|
||||
volume = analysis.get("volume", 0)
|
||||
|
||||
if volume > 50000000:
|
||||
return "高 - 需要加强排气系统"
|
||||
elif volume > 10000000:
|
||||
return "中 - 建议标准排气"
|
||||
else:
|
||||
return "低 - 常规排气即可"
|
||||
Reference in New Issue
Block a user