BRANCH:涉及領域 Foundries, Machine construction
鑄造，機械制造

TASK:任務 Wall thickness measurement on cast
camshafts
鑄件凸輪軸的厚度測量
A nondestructive method is required to detect the typical defect in casting, viz. “core mismatch”.
無損檢測用于發現鑄件中典型的缺陷，即“芯模錯位”
In consequence of this mismatch, reduced wall thicknesses occur leading to a failure of the camshaft in operation because of its lean geometry and due to the extreme dynamic load.
由于芯模錯位的存在，導致壁厚減薄的區域在凸輪軸運行過程中因芯模幾何形狀的傾斜和極端的動載荷將導致凸輪失效
SOLUTION: 方案
The recommended solution is to measure the wall thickness on the bearing points.
推薦的方法是測量軸點上的壁厚
The simple, annular geometry of these points allows to carry out the test on the shaft as cast. Further processing actions on any defective parts are thus excluded.
這些點簡單，環形的幾何形狀允許在鑄造的過程中對軸進行檢測，從而使進一步的加工處理部件沒有缺陷
This method makes it possible to recognize the core mismatch  by a reduced wall thickness and excessive wall thickness opposite (180°).
這種方法通過測量壁厚的減薄和對面壁厚的增加使識別芯模錯位成為可能
The waterflow (squirter/bubbler) technique is applied according to the arrangement shown in the sketch.
根據示意圖上顯示的布局水柱法可以被應用
This ensures a constant coupling in the area of the bearings around the entire circumference during camshaft rotation.
這樣確保了在凸輪軸旋轉的過程中能夠對整個軸的圓周面有一個穩定的耦合

Typical linear scans 典型的線性掃查
(wall thickness [mm] around the circumference [360o])
周向壁厚掃查
Circumferentially
developed view:
周向視圖

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設備
Ultrasonic flaw detectors: 設備 USD 15X or USPC 2100
Probe:探頭    H 2 KF
Accessories:附件    Multiplexer  MUX D
Software :軟件   UltraMAP