MP85를 포함한 클린치 모니터링은 더욱 안전한 혁신적인 기술을 만듭니다.
오늘날, 클린칭 또는 프레스 조이닝은 두가지 재료를 합치는데 혁신적인 기술이라는 것이 증명 되었습니다. 재질 사이의 형태와 포스의 잠김 접합부는 부분적인 냉각 성형에 의해 만들어집니다. 이 기술은 독창적으로 심플해 보이지만, 실제에선 다소 복잡합니다.
There are a lot of factors influencing the overall result of the joining process such as, for example, the properties of the materials to be processed or, also, process parameters like tool quality or joining force. Classical force versus displacement monitoring have as yet enabled only substantial deviations from the process to be recognized, such as a too small maximum force or an inappropriate selection of materials.
However, the quality of a clinch joint is also determined by other factors, such as the collar thickness which is material to the shear load capacity or the undercut which is important to the tensile stress on the interlocking button or the base thickness.
Only if all these parameters are in order, can the reliability of the joint be guaranteed. A challenging problem arises, if the collar thickness or the undercut deviate from the set value only at some points which, for example, may be due to a broken die. In this case, the force versus displacement curve shows only minor deviations from the set curve. However, the consequences might be disastrous, if, as a result, endurance strength is substantially reduced because the shear and tensile loads have been substantially reduced.
Clinch monitoring with MP85 enables these small deviations to be recognized and analyzed. The problem with analysis is that although the vertical position of the curve, i. e. the height of the curve, may vary within specified permissible limits, the process is evaluated in order. In this case, the form of the curve has to be evaluated instead of its position. The MP85 provides evaluation criteria that enable precisely this thread-in corridor to be defined (Min/Max thread-in force).
The second step taken at the beginning of the joining process is to smooth the curve in a displacement window that has been defined individually. The smoothed curve will be used as a reference in the subsequent evaluation windows.
The critical section is evaluated using a partial tolerance band. The selection of an appropriate partial tolerance band (oblique window) and of the optimal resolution for the measurement enable the deviation that has been caused by wear/defect of the tool to be precisely recognized and more defective parts and the resulting costs to be avoided.
For documentation of production data, clinch monitoring with MP85 enables all process and curve data to be recorded internally in the device (on MMC memory card) or externally on a production data server. If complete storage of production data is not required, a circular buffer of the last 1,000 curves and results can be activated.
For manual workplaces, a separate DT85 is available for visualization. Strain gage/piezoresistive or analog standard signals can be processed as force signals. Inductive, incremental, SSI, or potentiometric signals can be read and processed for displacement measurement.
