建立方向盘项目初始版本

models/switch_2020_crossbar132/DONE.txt

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+ok

models/switch_2020_crossbar132/validation.json

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+{
+  "crossbar_length_mm": 132,
+  "profile_mm": [
+    20,
+    20
+  ],
+  "crossbar_x_min_mm": -66,
+  "crossbar_x_max_mm": 66,
+  "added_volume_mm3": 0.0,
+  "removed_volume_mm3": 11199.999999999995,
+  "components": {
+    "NewRail0": {
+      "x_min_mm": -65.62005769999999,
+      "x_max_mm": -35.62005769999999,
+      "distance_mm": 0.0,
+      "overlap_mm3": 0.0
+    },
+    "NewRail1": {
+      "x_min_mm": 35.6200577,
+      "x_max_mm": 65.62005769999999,
+      "distance_mm": 0.0,
+      "overlap_mm3": 0.0
+    },
+    "SwitchAngleA": {
+      "x_min_mm": -52.25,
+      "x_max_mm": -33.25,
+      "distance_mm": 0.0,
+      "overlap_mm3": 0.0
+    },
+    "SwitchAngleB": {
+      "x_min_mm": 33.25,
+      "x_max_mm": 52.25,
+      "distance_mm": 0.0,
+      "overlap_mm3": 0.0
+    },
+    "SwitchCrossJoint0": {
+      "x_min_mm": -59.6200577,
+      "x_max_mm": -41.6200577,
+      "distance_mm": 0.0,
+      "overlap_mm3": 0.0
+    },
+    "SwitchCrossJoint1": {
+      "x_min_mm": 41.6200577,
+      "x_max_mm": 59.6200577,
+      "distance_mm": 0.0,
+      "overlap_mm3": 0.0
+    },
+    "SwitchEnvelope": {
+      "x_min_mm": -55.0,
+      "x_max_mm": 55.0,
+      "distance_mm": 5.0,
+      "overlap_mm3": 0
+    }
+  },
+  "bearing_plates_v3": {
+    "CompactPlate0": {
+      "added_volume_mm3": 0.0,
+      "removed_volume_mm3": 5963.669078594731,
+      "z_mm": -84
+    },
+    "CompactPlate1": {
+      "added_volume_mm3": 0.0,
+      "removed_volume_mm3": 5963.669078594731,
+      "z_mm": -187
+    }
+  },
+  "fcstd_reopened": true,
+  "step_valid": true,
+  "step_solid_count": 109
+}

models/switch_2020_crossbar132/方案说明.md

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+# 灯光开关横梁：132 mm
+
+灯光开关下方的横向型材改为 **2020 × 132 mm，1 根**；横梁沿宽度方向居中放在两根 3030 纵梁上方，通过两只角码连接。模型中两根纵梁中心距约 101.2401 mm，外侧总宽 131.2401 mm，横梁两端各比纵梁外缘突出约 0.38 mm。
+
+按现有示意位置，横梁连接纵梁的两个角码外缘距横梁端部各约 6.38 mm，开关支架两个长角码的外缘距横梁端部各约 13.75 mm。模型中的两根纵梁及四只角码与横梁接触且无体积交叉，开关占位包络与横梁间距 5 mm。角码位置、滑块、实物接线、安装螺丝及工具尚未完全建模，开关的实际外形并非绿色示意包络。
+
+两块旧的方形轴承板已替换成 `models/kfl001_plate_v3_alt` 的弧顶 V3 几何，安装坐标保持不变；与旧板相比只有削减，没有新增材料。当前总装中其余型材保留已有模型尺寸：底座 3030 纵梁 255 mm × 2；轴承支撑的 3030 横梁 71.2401 mm × 2；电机旁 2020 型材 110 mm × 2。除本次 132 mm 横梁以外，这些是模型现有尺寸，未因本次变更做圆整或强度设计。
+
+`Assembly.FCStd` 和 `Assembly.step` 均重新打开检查；`validation.json` 记录横梁及两块固定板的几何对比。此结果为模型装配检查，不能替代开关、型材槽、角码及紧固件实物装配和动力强度验证。