BRANCH:涉及領(lǐng)域 Foundries, Machine construction
鑄造，機(jī)械制造

TASK:任務(wù) 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(fā)現(xiàn)鑄件中典型的缺陷，即“芯模錯(cuò)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(cuò)位的存在，導(dǎo)致壁厚減薄的區(qū)域在凸輪軸運(yùn)行過程中因芯模幾何形狀的傾斜和極端的動(dòng)載荷將導(dǎo)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(diǎn)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(diǎn)簡單，環(huán)形的幾何形狀允許在鑄造的過程中對軸進(jìn)行檢測，從而使進(jìn)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(cuò)位成為可能
The waterflow (squirter/bubbler) technique is applied according to the arrangement shown in the sketch.
根據(jù)示意圖上顯示的布局水柱法可以被應(yīng)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(zhuǎn)的過程中能夠?qū)φ麄�(gè)軸的圓周面有一個(gè)穩(wěn)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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