With the help of industrial computer-aided tomography, which is based on X-ray technology, it is now possible to investigate the structural characteristics of modules without damaging them.

The idea behind this new technology is to digitise automobile components using X-ray technology, compare them with original CAD data records and then evaluate them on the screen with respect to quality and tolerances.

Conventional radiography results in two dimensional X-ray images. In contrast, the computer-aided tomograph records the object to be examined two dimensionally from many angles and then interlinks the data to form a three-dimensional image.

The development of the system began in 2003. In 2005, Delphi started operation of the system on a trial basis. It now uses computer tomography for structural analyses during production and for fault finding with regard to cast products such as cylinder heads, engine blocks and attaching parts.

The principle of radiography is relatively simple. A radiation source emits X-rays that penetrate the object and impinge on an image plane located behind it. Depending on its material density, the object absorbs a smaller or larger proportion of this radiation.

The remaining radiation impinges on the image plane – the detector – which in the case of Delphi features over one million pixels. These absorb the radiation pulses and transmit them in the form of electrical pulses to the electronics. The computer first digitises the individual two dimensional greyscale X-ray images and then assembles them to form a three-dimensional model.

Computer aided tomography is used above all for the structural analyses of components and in the development and design of mould components. The analyses make it possible to optimise moulds and the injection process quickly and at an early stage.

The system is also capable of more:X-rays are an extremely suitable tool for the measurement of complex geometries.

The second field of application for computer aided tomography(in addition to analysing structures) is digital length measurement technology. From the three-dimensional scatter plots based on the X-ray images, a special software generates data records with the exact measurements of the object under examination. These data records are then superimposed in several steps with the corresponding CAD data records from the design department. Each measured detail of the component is compared with the CAD model as a numerical value.

The larger the dimensional difference, the more intensively the software displays the determined deviation, based on a colour scale.

With a commonly used object – the switch – a series of X-ray images can even precisely depict its operation. The viewer can check the sequence of movements, i.e. whether the small springs for actuation are correctly mounted.

Based on the colour graduations in this three-dimensional target/actual comparison, the congruence between the real component and the conceptual design can be viewed directly on-screen. Previously,the component had to be laboriously dismantled into individual pieces and measured manually. In the case of complex parts, this procedure could last up to several weeks. Moreover,the data model can be rotated at will in real time and can be cut into sections along any axis and analysed. In future, a few days rather than several weeks will be required for tasks of this type.

The components examined are not modified or damaged in any way; they consequently examined are not modified or damaged in any way; they consequently remain available for other purposes.

The viewer can check images in a short time sequence,i.e. view and monitor motion sequences. For example, if release springs in a connector are correctly mounted or the locking action of the connector is functioning correctly.

Whereas analysing the inner life of components was previously either impossible or a very difficult and time-consuming process,today creation of the X-ray images and three-dimensional image generation are performed in the matter of a few hours.

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基于X射线技术的工业计算机辅助层析X射线照相术，现在可以在破坏模块的情况下检查其结构特性。

这种新技术基于这样一种理念，即用X射线技术将汽车元件数字化，并与原始CAD数据记录进行对比，然后在屏幕上评估其质量和误差。

常规X射线照相术只能形成两维X射线图像。相比之下，计算机辅助的层析X射线照相术则能够以多角度双维记录待检验目标，然后将数据互连形成一个三维图像。

该系统的开发始于2003年，Delphi2005开始对系统进行了试验性操作。如今，计算机层析X射线照相术已应用到了生产过程中的结构分析以及汽缸盖、发动机机体以及连接件等铸件的故障检测中。

X射线照相术的原理比较简单。放射源发射出的X射线穿过物体并冲击其后的成像平面。物体吸收辐射的比例视其材料密度而定。

残留的辐射冲击成像平面——探测器，Delphi所使用的探测器的象素超过100万。探测器吸收辐射脉冲，并以电子脉冲的形式将辐射脉冲传输至电子仪器上。计算机首先将多个单一双维灰度X射线图象数字化，然后将其合成一个三维模型。

计算机辅助层析X射线照相术主要用于元件结构分析以及模制元件的开发和设计。通过分析，在早期就已经快速实现了优化模具和灌注工艺。

该系统的功能还有：X射线非常适用于复杂几何形状的测量。

除结构分析外，计算机辅助层析X射线照相术的第二个应用领域就是数字长度测量技术。根据X射线图象的三维分散绘图，一种专用软件将为待测目标生成精确测量的数据记录。然后，这些数据记录在下面步骤中与设计部提供的相应的CAD数据记录进行叠加。元件的每项测量细节都以数值的形成与CAD模型进行比较。

尺寸差别越大，软件基于色度标所显示的偏移就越集中。

对于开关这种普通的物件来说，一系列的X射线图象甚至能够精确地描绘出其作业过程。观察者能够检查运动顺序，即促动开关的小弹簧安装是否正确。

在这个三维目标/实际比照的色分度基础上，可以直接从屏幕上看到实际元件和概念设计之间的一致性。以前，必须要费力地将元件拆成零件后才能进行人工测量。如果零件复杂，这个过程就有可能持续数周。但是，现在的数据模型就可以实时进行随意旋转，并能够沿轴切成截面后进行分析。将来，完成这样的任务不需要数周，几天就可以了。

受检元件没有任何变化和损坏，依然可做他用。

很快，观察者就可以检查图象，即查看并监视运动过程。例如，检查接头内弹簧的安装是否正确，接头的锁定作用是否有效。

过去，分析元件的内部结构是不可能的，即使能分析，也是一个既困难又费时的过程。而如今，X射线成像和三维成像技术在几个小时内就可以完成这一任务。