diff --git a/src/moldinsight/core/base_mold_generator.py b/src/moldinsight/core/base_mold_generator.py
index 67045fc..7edc64b 100644
--- a/src/moldinsight/core/base_mold_generator.py
+++ b/src/moldinsight/core/base_mold_generator.py
@@ -85,6 +85,18 @@ class BaseMoldGenerator:
         except Exception:
             return gp_Dir(0, 0, 1)
 
+    @staticmethod
+    def _create_mold_block(analysis: Dict, margin: float = 30.0) -> TopoDS_Shape:
+        """基于产品边界框创建模具包围盒（用于切分 A/B 半模等可视化用途）。"""
+        bbox = analysis.get("bounding_box", {})
+        dims = bbox.get("dimensions", [100, 100, 100])
+        center = bbox.get("center", [0, 0, 0])
+        half = [d / 2 + margin for d in dims]
+        return BRepPrimAPI_MakeBox(
+            gp_Pnt(center[0] - half[0], center[1] - half[1], center[2] - half[2]),
+            gp_Pnt(center[0] + half[0], center[1] + half[1], center[2] + half[2]),
+        ).Shape()
+
     def _find_draftable_faces(self, shape: TopoDS_Shape, draft_direction: gp_Dir) -> List[TopoDS_Face]:
         draftable = []
         explorer = TopExp_Explorer(shape, TopAbs_FACE)
@@ -257,7 +269,8 @@ class BaseMoldGenerator:
 
             cavity = self._subtract_product_from_plate(mold_block, shape, "型腔")
             if cavity is None:
-                cavity = mold_block
+                logger.error("型腔布尔减运算失败，无法生成有效型腔几何")
+                raise RuntimeError("型腔布尔减运算失败：无法从模具块中减去产品形状")
 
             core = self._build_core_with_base(
                 shape, mold_block, parting_plane,
@@ -440,8 +453,8 @@ class BaseMoldGenerator:
             return None, None
 
     def _subtract_product_from_plate(self, plate: TopoDS_Shape, product: TopoDS_Shape,
-                                      plate_name: str) -> TopoDS_Shape:
-        """从模板中减去产品形状，生成型腔或型芯"""
+                                      plate_name: str) -> Optional[TopoDS_Shape]:
+        """从模板中减去产品形状，生成型腔或型芯。失败时返回 None 而非静默返回纯方块。"""
         try:
             cut_op = BRepAlgoAPI_Cut(plate, product)
             if cut_op.IsDone():
@@ -449,11 +462,11 @@ class BaseMoldGenerator:
                 logger.info(f"{plate_name}减去产品成功")
                 return result
             else:
-                logger.warning(f"{plate_name}布尔减运算失败")
-                return plate
+                logger.warning(f"{plate_name}布尔减运算失败，返回 None 而非纯方块")
+                return None
         except Exception as e:
             logger.warning(f"{plate_name}减产品失败: {e}")
-            return plate
+            return None
 
     def _split_cavity_core_fallback(self, shape: TopoDS_Shape,
                                      mold_block: Optional[TopoDS_Shape] = None) -> Tuple[TopoDS_Shape, TopoDS_Shape]:
@@ -476,7 +489,8 @@ class BaseMoldGenerator:
 
             cavity = self._subtract_product_from_plate(mold_block, shape, "型腔(回退)")
             if cavity is None:
-                cavity = mold_block
+                logger.error("回退方案型腔布尔减运算也失败")
+                raise RuntimeError("回退方案型腔布尔减运算失败")
 
             center_z = (zmin + zmax) / 2
             parting_plane = gp_Pln(gp_Pnt(0, 0, center_z), gp_Dir(0, 0, 1))
@@ -503,7 +517,9 @@ class BaseMoldGenerator:
                     gp_Pnt(xmax + margin, ymax + margin, zmax + margin)
                 ).Shape()
                 cavity = self._subtract_product_from_plate(cavity_block, shape, "型腔(兜底)")
-                return cavity or cavity_block, shape
+                if cavity is None:
+                    raise RuntimeError("兜底型腔布尔减运算失败")
+                return cavity, shape
             except Exception:
                 return shape, shape
 
diff --git a/src/moldinsight/core/cad_exporter.py b/src/moldinsight/core/cad_exporter.py
index ef944ca..cf54356 100644
--- a/src/moldinsight/core/cad_exporter.py
+++ b/src/moldinsight/core/cad_exporter.py
@@ -266,6 +266,9 @@ class CADExporter:
             "cavity": ("cavity", "型腔"),
             "core": ("core", "型芯"),
             "parting_surface": ("parting_surface", "分型面"),
+            "product": ("product", "产品本体"),
+            "a_plate": ("a_plate", "A板(上模)"),
+            "b_plate": ("b_plate", "B板(下模)"),
         }
 
         shapes_to_export: List[Tuple[str, str, TopoDS_Shape]] = []
diff --git a/src/moldinsight/core/multi_scheme_planner.py b/src/moldinsight/core/multi_scheme_planner.py
index d218df6..13c3b00 100644
--- a/src/moldinsight/core/multi_scheme_planner.py
+++ b/src/moldinsight/core/multi_scheme_planner.py
@@ -161,6 +161,17 @@ class MultiSchemeMoldPlanner:
         cavity_data["metadata"]["core_required"] = mold_structure["core_required"]
         cavity_data["metadata"]["structure_decision_reason"] = mold_structure["decision_reason"]
 
+        # 生成可视化辅助形状：A/B 半模（分型面切分）、产品本体
+        a_plate, b_plate, product_for_export = None, None, scaled_shape
+        try:
+            mold_block_shape = generator._create_mold_block(analysis, margin=30.0)
+            a_plate, b_plate = generator._split_mold_block_by_plane(
+                mold_block_shape,
+                generator._get_parting_plane(parting_surface, shape),
+            )
+        except Exception as exc:
+            logger.debug(f"A/B 半模生成失败（不影响主流程）: {exc}")
+
         return {
             "scheme_id": candidate["scheme_id"],
             "method": candidate["method"],
@@ -188,6 +199,9 @@ class MultiSchemeMoldPlanner:
                 "cavity": cavity,
                 "core": core,
                 "parting_surface": parting_surface,
+                "product": product_for_export,
+                "a_plate": a_plate,
+                "b_plate": b_plate,
             },
         }