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Case 机器视觉案例


日期: 2020-08-05
浏览次数: 253

Pontiac Coil manufactures electrical coils, solenoids, and electromechanical devices for automotive, trucking, mobile equipment, medical, information technology and telecommunications applications. In building a fuel stator for a diesel engine, the company has long manually inspected every part to ensure that the lead tower cap had been attached with pins or screws and that the lead towers have been soldered. The company is penalized $2,000 for any defect on this part. Pontiac Coil previously used vision systems that cost $10,700 for similar applications but asked a vision systems distributor if they could provide a more cost-effective solution.

The Vision Traceability Group (VTG), a certified solutions provider of machine vision solutions that is a division of McNaughton-McKay Electric Company, proposed using a Cognex In-Sight® Micro 1050 vision system that costs about $3,700. Rob Osgood, Manufacturing Engineer for Pontiac Coil, developed the application using the vision sensor’s graphical user interface in one week and installed it on the line in only 90 minutes. “The In-Sight vision system has demonstrated its ability to flawlessly inspect several different part numbers,” Osgood said. “In its first full week of operation, it detected two defects, more than paying for itself.”

Manufacturing fuel injection stators

Quality assurance and process control are the foundation of manufacturing at Pontiac Coil. Customers include Delphi, Eaton, Visteon, Cummins, American Axle, Behr, Honeywell, Husco, Teleflex, Bosch, Usui and Ogura. Pontiac Coil employs 340 people and is headquartered in Clarkston, MI, with additional manufacturing facilities in Searcy, AR, and Nottingham, UK.

Most diesel engines use fuel injectors to deliver an atomized fuel charge to the engine cylinders. An electronic timing circuit delivers precisely timed electrical pulses for operation of the fuel injector. These pulses are delivered to a solenoid stator assembly which generates magnetic forces to actuate a solenoid plunger mounted in the fuel injector that controls the injection of fuel into each engine cylinder. The housing of the solenoid stator assembly protects the internal electrical components and locates them precisely in relation to the reciprocating solenoid plunger.

Pontiac Coil builds several types of stators for diesel engines used on heavy trucks. These stators are inspected on a dial machine that checks for high potential (hipot) conditions by applying a high voltage and making sure it does not penetrate the shell. The machine also performs leak testing and laser inspection of threads inside the body. Parts that pass all tests are then laser etched with a unique serial number. The dial machine is manually loaded and unloaded. In the past, the only manual inspection operation was to check the fasteners on the stator.

Two different types of fasteners—pins and star head screws—are used on the two different types of stators inspected on this line and the company needs to ensure that the correct screw is present. Each terminal also needs to be coated with solder so that it makes a good connection with the housing. Also, there are lobes located on the housing to the left and right of a cavity that could potentially be broken off, so the stators also need to be inspected for their presence. Pontiac Coil has used a number of costly vision systems in similar applications and consultants are typically needed to configure these complex systems.

Feasibility study

Tim McLennan, sales engineer for VTG, visited Pontiac Coil and examined the application. He performed a study to evaluating the feasibility of using a much less expensive Cognex vision solution to inspect the part. McLennan brought sample parts back to the company’s vision lab and Jim Witherspoon, Application Engineer for VTG, performed the feasibility study. After experimenting with the application in the lab, Witherspoon concluded that lighting is the key to this application. “Various direct ring lights can be attempted but the CCS High Intensity ring light makes this application very robust,” Witherspoon’s report concluded. “If there is a solder then the tips glow a bright white. If the solder is missing then the tips remain dark. The pins and screw verification also works very well with the prescribed lighting.”

Witherspoon recommended the Cognex In-Sight Micro 1050 vision system because it provides both EasyBuilder® and spreadsheet application development interfaces. Cognex In-Sight Micro vision systems enable powerful vision applications using a small self-contained package available at an economical cost. Additionally, In-Sight vision systems feature the EasyBuilder interface that walks the user through the process of configuring the vision application step by step. The In-Sight enclosure is only 30mm x 30mm x 60mm and provides 640 x 480 (VGA) resolution.

In-Sight Micro vision systems are the size of a remote-head camera so they are ideal for mounting in very tight spaces on robots, production lines and machinery. In addition to their small size, they provide flexible mounting capability with a unique non-linear calibration tool that enables mounting at angles of up to 45-degrees for hard-to-reach applications. They also offer an Ethernet output that simplifies the task of interfacing the vision system and, in some applications, eliminates the expense of a programmable logic controller (PLC) by communicating directly with the production system.

Developing the vision application

The feasibility study demonstrated that the In-Sight vision system could identify good parts from bad parts,” said Rob Osgood, Manufacturing Engineer for Pontiac Coil. “I took on the task of developing the application and integrating the vision system into our production system.” Osgood started off by mounting the vision system and connecting it by an Ethernet cable to the network switch. The vision system is powered by a Power over Ethernet (PoE) adaptor. He used the lighting and the lens recommended by VTG. Osgood configured the vision system with an IP address on the network that was immediately recognized by the Allen Bradley PLC that controls the production system PLC. The EasyBuilder interface automatically generates the Allen Bradley ControlLogix commands needed to communicate with the PLC.

Osgood used the spreadsheet functionality to perform several filtering operations, including binarization and stretching, for each screw position. He used a series of contrast tools to search for each of the fasteners that should be present in the stator housing. The contrast tools measure the number of light pixels relative to the dark pixels within each area where each of the five screws and two lobes are supposed to be located. The next step after verifying the presence of the screws or lobes is the use of pattern tools to check the type of each fastener on the stator.

The presence of solder is inspected simply by binarizing the image of each terminal and measuring the grey scale. Osgood identified the lobes by searching for the plastic circle on each lobe and verifying its diameter. He used EasyBuilder’s point-and-click communications setup to configure the vision system to send inspection results to the PLC after each inspection. In the deployment mode, color tools graphics, a results table and a filmstrip enable to the operator and maintenance staff to review images in order to verify the identification of bad parts and troubleshoot the application.

“The vision application has helped us improve quality while reducing manpower on the inspection line,” Osgood concluded. “The vision system’s relatively low cost was easy to justify since we are penalized $2,000 for any defect. The vision system has operated for six months and in this time it has never passed a bad part nor failed a good part. The result is that we have been able to free up a manual inspector on the line for a more proactive assignment and run the inspection system without operators except for loading and unloading parts. The programmability of the vision system means that we can easily modify the program to compensate for design or process changes. Most important of all, we are confident that we have no fastener-related defects.”

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电容式传感器的基本原理与特性 2022 - 12 - 05 今天我们来讲一下电容式传感器的原理,首先什么是电容传感器呢?电容传感器主要是一种开关传感器,可以检测活动区附近的材料因为这些材料会影响电场。现在您可以通过一些简短的动画进行了解。电容式传感器的主要优势,他们完全不受材料的颜色,表面特性的影响。在某些条件下甚至可以透壁检测。并且对空气中的污染物不灵敏,例如灰尘,另外重要的一点是,他们工作是完全不受任何类型背景光的影响。那么在使用电容式传感器时应该考虑哪些方面呢?       首先要考虑的是所检测物体的湿度或者尺寸可能发生变化。还需要考虑一些典型的开关频率。当然您还需要关注激光位移传感器之间的距离。最重要的一点是激光位移传感器开关距离以及特定材料的绝缘常量。关于电容式传感器,我们还需要来了解哪些其他方面呢?它有三个主要的应用领域,首先是容量控制,这里可以看到一个简单的图片,也是包装行业的一个事例,图中的两个传感器底部和顶部各有一个。       可用于检测罐装高度的高位和低位,从而开始和停止估计流程,另外一个主要应用领域是内装物控制在这个图片里,你可以看到典型的就是检测牛奶或者一些食品的人,物体内部包装的产品的容量,检测各个包装中是否存在冲突,这里电容式传感器的用处是最后一个应用是主要应用在状态控制,图中的只是可以看到这里是通过太阳能行业的一个示例,来了解电...
浅谈条码阅读器的冗余功能作用 2022 - 12 - 05 今天我们讨论的是条码阅读器的性能冗余,高性能条码阅读器有哪些优势呢?有时在使用中条码阅读器在调试时。不能很好的对准。或者条码阅读器在使用一段时间后出现故障和校准错误。纸箱和包裹也可能出现大幅度变形或者倾斜。或者定义范围不合适。或者超出质量标准,甚至有时还会达到,没有达到标准的class a,条码标准。例如条码印刷不清晰或者褪色。在所有的这种条件情况下,我们的条码阅读器的性能冗余就派上用场了。       条码阅读器达到参数限制时。通常需要性的目的,也就是说即使阅读条件不在标准范围内,足够高的读取质量也能解决这个问题。即使在极端条件下,我们专门开发的光学和模拟电子装置也能可靠读取条码信息。我给大家演示一下,在这个简单的装置中,条码阅读器通过以太网连接到PC,可以使用web对口激活调节模式,然后通过图表显示质量,如果条码印刷质量较好,清洁角度高达±30度,也能保证实现可靠性,但您可以看到我们产品的检测范围远远超过低级的限制。我们将这个产品功能,称为性能荣誉,该功能可以实现非常高的录取质量和应用可靠性。您在应用中遇到哪些问题呢?请联系我们。
激光位移传感器再高温或者低温环境,真空耐腐蚀环境下如何工作 2022 - 12 - 03 无论是半导体加工过程中还是锂电池制造过程中总是伴随着腐蚀,高温振动等恶劣环境,为了保证生产的高效稳定,无锡泓川科技推出了多种具有不同钢铁不锈钢金属外壳的激光位移传感器,具有高防护性,可以从容的面对各种复杂的环境。在生产过程中总是在恶劣的环境中进行。在当今的环境中,自动化解决方案有时会暴露在非常困难的生产条件下。而且还必须具有可靠的功能,这对传感器技术来说是一个挑战。无锡泓川科技有限公司广泛的测试程序,确保了我们的激光位移传感器能够承受恶劣的环境要求。例如在电子行业中电子产品在我们日常生活中扮演着重要的角色。无论是在电动巴士和汽车的电池中,还是在太阳能发电模块中。自动化生产在电子工业的许多领域都是非常复杂的。真空和高温环境是随处可见的。使用的化学物质具有腐蚀性。这不仅影响生产条件和机器在许多应用领域,传感器解决方案也面临着新的挑战。那么能满足这些挑战的出色的激光位移传感器是什么样的呢?在某些情况他必须能抗抵抗至少70度到100度的高温。或者他必须能承受真空环境并且具有腐蚀性,化学物质的过程中也能抗拒。他应该有特别耐用的材料制成如不锈钢甚至特氟龙材料。无锡泓川科技有限公司提供范围广泛的激光位移传感器和激光位移传感器技术,尤其适用于恶劣环境。
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