DFM-the gap between the PCB manufacturing and design solution

DFM-the gap between the PCB manufacturing and design solution

Happy Holden and Michael Fordi theory of the industry to fill the gap between design and manufacturing of urgent need.Michael provided the IPC - 2581 and CFX combination, will no longer exists not for technology to optimize the design of the circuit board manufacturers, as well as the reasons. As Michael said, now is the break barriers, good time to promote the development of DFM and industry to move on.

Andy Shaughnessy: today we discuss DFM, and how we are going to help designers and those who always get wrong data of CAM engineer. Why DFM looks so reach?

Michael Ford: there is a big gap between design and manufacturing, mainly for three reasons. First of all, the design and manufacture of distance between geographical position. The location of the products into production and the location of the product design is often far apart. In addition to exist on the space distance, there is also time interval, completion of product design, could take months to put into production. Meanwhile, product designers have begun to other projects.

But it is also related to the subordinate different technology. When manufacturing problem, practitioners in the field of manufacturing for help they tend to be mentioned from stick machine, reflow soldering furnace temperature curve, and it is difficult to understand these terms for designers.

Design and manufacture of both sides on the basis of their own experience, technology, and describe the problem, can not be truly effective communication.And because manufacturing is very complex, involving different equipment and materials, so for anyone is very difficult to obtain the comprehensive information success.

Happy Holden: when I was in to guide the design of PCB layout design engineer (even if they see the same factories produced different multilayer printed circuit board), tell them the most important thing is, "The enormity of the task you face is in the design of PCB at the same time also remember that must go to plan design, use of EDA tools and new components, short rise time, reduce the heat problem. To do this, you can become the world's top PCB designer. I don't want you to be manufacturing experts, the only thing you need to do is visit the PCB production factory, understand the complexity of the whole PCB manufacturing process. Once encountered problems in a timely manner to make party E-mail or in person to the factory to ask.

Designers face a big problem is the lack of a detailed PCB design flow chart. In a node, will encounter serious problems in the component placement and layout, and these different aspects are likely to go wrong. We'll ask CAM from personnel of course of these problems, let them to solve these problems, and according to the PCB cost of products, the answer to standardization. Different choices lead to different cost, cost determines what kind of plan is cheap, what kind of expensive.

Then we will fill into a table or a checklist, the results for the use of the designer. At least before making a choice they can understand different choices will result in what kind of results. Where I never book, which design course, or which met this kind of information in the IPC standard. If there are countless ways to PCB layout, so how can you choose the best way? If I placed the CPU in a can only three sides wiring not all around the edge of wiring position, there will be what kind of consequences?

Ford: foreground is very optimistic, because the industry has made good progress recently, some details have been implemented. First of all, the IPC - 2581 standard C version, now called DPMX, forthcoming. C version to add the new module for DFM feedback. The new standard is no longer the past that based on the rules of DFM - only from the point of manufacture to join some rules of design rule checking; But the building designers and manufacturers to communicate directly through clear digital methods of a mechanism. Use this mechanism, people no longer need to send a large number of documents and drawings, through phone calls and emails pass information back and forth, the way easy to lose information or misunderstanding, and adopt a pass all information flow channel.

The second progress is DPMX file (i.e., the IPC - 2581) has now started to used in the manufacture of assembly. Before designing the data mainly flow to the digital manufacturing engineering system, the system will also have a different data needed for each device, and application of local BOM. But if programming involving equipment, equipment will need more product design information. Provided for this purpose, the IPC interconnected factory data exchange (CFX) IIOT data exchange is directly to the function of the machine to send the original PC - 2581 files, so that the machine directly accurate reference for the design data. Soon after, we can see the most advanced equipment suppliers the real news reports of the technology has been applied.

Holden: it's like a TAM network

Ford: that's right, the difficulty lies in the different fields always difficult to fully understand the design information. Twin concept has clearly defined the IPC number specifies the interdisciplinary way of obtaining information. Different process information into digital content is understandable, for example, can get information from DPMX file. This is part of the whole digital mr.li. Design and manufacturing needs is connectivity and animation.

Nolan Johnson: for CAD tools and the manufacturer, this is a let them in the design process can be real-time communication and interaction opportunity?

Mr Ford: this is the first stage. We hope to see in designer where change is before they deliver the product manufacturing, is no longer in the form of well-defined project to design a product, but can work together with manufacturing, has a continuous flow of information between both sides. Because the manufacturing and design both sides there is always a certain distance, when the material shortage or pricing problem, such as the need from the selected local suppliers call alternative materials, the manufacturer will often use the designer without being authorized by the material, even they didn't foresee the material must be used. All the world DFM design and control rules are not contain unexpected logic.

So need such a cooperation platform, when meet this kind of circumstance, can make those who look for alternative materials to meet the production requirements of local manufacturers to get the permission of the designer, designer to confirm the function of the replacement material, specification and physical properties (including pin, etc.) in shape and size, welding plate, meet the requirements. This process is not implemented, even if has, is also a process of useless, because wait for manufacturers want to communicate with the designer, designer would have to responsible for other projects.

Holden: it is very important, because engineer is responsible for the selection of components, such as material, everything seems to be no problem, but if asked the head of assembly test, they will say, "no, this kind of component failure rate is very high, often test problems. The component can play the same role, but in the quality testing, than you of the selected device has a higher level of testability.

Ford: such a thing happen, may also is a kind of localization issues. May depend on the specific production equipment and materials suppliers. Interaction is really important, I have seen such communication smooth team, they are providing feedback information, so you won't get DFM question I mentioned just now, because the manufacturer can give some information, such as the use of the components, rty problems, failure rate is about 100 x10-6, and through different towards place this element, rolled yield will increase, failure Rate can be reduced to 10 x 10-6, this kind of information format for designer is easy to understand, because through the use of the data, can avoid to use based on the field of technical terms.

Johnson: that sounds like a convert huge amounts of data into statistical Al can be used as a feedback advice. Also means that manufacturers will collect and interpret data has changed dramatically, manufacturers need to have A lot of A related professional knowledge.

Ford: manufacturing a large number of practitioners priority right now is to collect data, as much as possible in many cases, they will collect information from the device. Provided the IPC CFX standards are the most efficient way to collect data from the machine, but the need to create value in a specific environment.

Ascertained that should communicate information and events, if only raw data exchange (it takes up space and high complexity), designer how to understand these data? All based on the design of computer software has a similar problem - just like human designers cannot understand manufacturing engineers, the expression of the designer's computer program cannot read data. In the context of a manufacturing will data points together, the easy to understand the meaning of others. We also need to avoid making the deviation in the process of the internal cause, so as not to internal cause and the root cause confusion. We then will be in the form of a designer can understand the reality system feedback to them and their use.

Ascertained that should communicate information and events, if only raw data exchange (it takes up space and high complexity), designer how to understand these data? All based on the design of computer software has a similar problem - just like human designers cannot understand manufacturing engineers, the expression of the designer's computer program cannot read data. In the context of a manufacturing will data points together, the easy to understand the meaning of others. We also need to avoid making the deviation in the process of the internal cause, so as not to internal cause and the root cause confusion. We then will be in the form of a designer can understand the reality system feedback to them and their use.

Ascertained that should communicate information and events, if only raw data exchange (it takes up space and high complexity), designer how to understand these data? All based on the design of computer software has a similar problem - just like human designers cannot understand manufacturing engineers, the expression of the designer's computer program cannot read data. In the context of a manufacturing will data points together, the easy to understand the meaning of others. We also need to avoid making the deviation in the process of the internal cause, so as not to internal cause and the root cause confusion. We then will be in the form of a designer can understand the reality system feedback to them and their use.