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Complete traceability using DPM ensures long term satisfaction for Siemen


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Complete traceability ensures long term satisfaction for Siemens automotive clients

Siemens cannot afford any uncertainty when it comes to production for their high profile automobile clients. Safety and quality control has become of the utmost importance in this industry. This means that complete traceability of each individual part is essential. For the production of fuel pumps at the Asnières (France) production plant, Siemens chose Technifor to ensure this traceability using direct part marking (DPM) on the body of each gasoline pump. Siemens is using Cognex In-Sight® vision systems all along the production line to read and inspect directly marked codes at each point of production.

Siemens VDO is a leading international automotive supplier of electronics and mechatronics. As a development partner within the automobile industry, they manufacture a comprehensive range of products relating to engine management electronics and fuel injection. For the production of two different kinds of gasoline pumps, Siemens needs to ensure each one is marked with 2 different codes. The position of the codes must be verified and the codes need to be read correctly so that each piece is recorded as having been appropriately marked and checked in a data base as it passes each check point on the production line.

“100% read”

There are two assembly lines. One assembly line uses an alloy material for the body and the second assembly line uses stainless steel. The two bodies are marked with both an alphanumeric and a data matrix code and must be entirely readable in order to verified before the result is recorded.

Each body needs to be marked using two codes. One alphanumeric and the other data matrix so that each piece is identifiable by means of a unique code. Once the codes are marked the pieces undergo a series of checks and controls on the production line. At each stage the code needs to be verified and read. Firstly the codes are verified to ensure their positioning is accurate. Secondly the code is read in order to check that it is legible. This is vital. The code needs to be correctly positioned on the body of the part in question, a part which may be defective or difficult to manipulate. Plus, this same part needs to be correctly read and identified in order to avoid any disruption to the production line. Clients demand a standard of "zero non-read" which means no piece can get through as not having been read. Even one “non-read” piece would necessitate a manual intervention which would not only compromise the “white room” environment but would also slow down the production flow.

Technical constraints

Technifor was entrusted with the mission of marking and reading the codes during the production of each gasoline pump. They decided to use the direct part marking process of “dot peening”. This is an direct impact marking process used to mark codes onto hard or metal surfaces. The surface of the pumps were either stainless steel or aluminum and so these different surface textures increased the challenge. Added to this is the environmental aspect in that production would have to be carried out under "white room" conditions. The reading and verification of codes in these circumstances requires a robust and high performing solution.

Long term traceability

A final need of the client demanded that each production check be recorded so that at each control point an accurate trace is kept on each pump in question. These details are automatically entered into a database which is integrated into the client's operations. For example the point of inspection which ensures the pump is water-tight. Here the code is verified by the camera, read by the camera and the fact that it has been inspected at this precise point is recorded and the result is fed into the data base.


The nature of the technical constraints and the challenging circumstances of the application meant that machine vision was the only solution. Cognex In-Sight cameras proved the only reliable means for code verification and reading as well as being capable of cooperating with the data collection process. In-Sight vision systems are high performing even in difficult environments. The constraints of this application required robust vision systems. The marking process involved is extremely effective and chosen for its durability. The nature of marking by peening requires a high performing vision solution capable of reading 100% of the codes while coping with low contrast and surface reflection difficulties.


  • An efficient implementation of production which means money and time are saved
  • Guaranteed 100% codes read
  • Integrated and accurate traceability throughout the entirety of Siemens automotive operations

100% traceability and a proven, highly automated production process

Siemens is able to respond to the demands of their clients thanks to the capabilities of Cognex vision systems. Each part leaving Siemens is traceable from "cradle to grave" ensured by Technifor "mark and read" relying on Cognex vision systems. Siemens can now assure their clients that the entire process of production is controlled, inspected and recorded from start to finish. They can also prove that each piece is completely traceable and has been correctly inspected. By taking advantage of the best of advanced technology Siemens is ensuring they maintain a competitive edge and pass the benefits onto their clients.

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