Stamping
For stamping process steps, providing inline visual inspection solutions for short shot, burrs, press damage, dimensions and skipped process steps.
Industry Production characteristics
How This Industry Produces Determines How Inspection Should Be Done
The visual inspection of stamping revolves around two things: first, making the most common defects in this industry image clearly and consistently; second, connecting the judgement result reliably into the production line. Common implementation constraints in this industry are "stamping speed is fast, so imaging must freeze the motion"; "metal surfaces are highly reflective with obvious machining marks". Whether detection can be stable depends on material optical properties, minimum defect size, and cycle time, and is subject to the results of a measured sample trial.
The characteristics of stamping are High speed, regular mold wear, defects repeat continuously. A single mold anomaly can produce a large number of defective parts in a short time.
Therefore visual inspection in the stamping industry often requires Inline, real-time, capable of interlock shutdown — not picking out defects after the fact, but stopping them as soon as they begin to appear.
Industry Inspection issues
Where problems actually occur on site
- Short Shot, Missing Punched Holes
- Excessive burr
- Compression marks, scratches and deformation
- Drawing crack
- Missing process step (no chamfering, no tapping)
Typical Inspection Objects
The Most Common Inspection Objects in This Industry
Typical Inspection Task
The judgments to be made on these objects
- Hole position and count verification
- Burr check
- Appearance defect identification
- Missed Process Step Inspection
- dimensional measurement
Vision Inspection Challenges
Implementation constraints specific to this industry
- Stamping is fast, so imaging must freeze the motion
- Metal surfaces are highly reflective and show pronounced machining marks
- Fine burrs with irregular boundaries
- Progressive dies have multiple stations and require per-station judgement
Choosing the right algorithm
Choose by Acceptance Criteria Form, Not by How Advanced It Is
Rule-Based Algorithm
Clear acceptance criteria such as hole position, count and chamfer
Anomaly Detection
Appearance defect identification
Geometric Measurement
Dimension and position deviation
acquisition and light source
Optical conditions set the upper limit of feasibility
- Strobing light sources with short exposure freeze high-speed motion
- For metal reflections, use diffuse light with polarization
- For burr inspection, use low-angle grazing light so boundaries cast shadows
OK / NG Judgement
How results are judged and used
| Inspection Status | judgement | Interlocking Action |
|---|---|---|
| All checks pass | OK | release |
| Short shot / burr / deformation present | NG | Reject; stop the line on consecutive defects |
| Missing process step | NG | Reject and prompt a process step check |
PLC and Automation Interlocking
How results connect to the production line
For stamping lines, it is recommended to connect the inspection results to Shutdown interlock: automatically stops the machine after N consecutive defective parts, preventing continued output from a mold problem.
When working with a progressive die, results can be output per station, making it easier to pinpoint the problem station.
Applicable equipment
Common configuration forms for this type of inspection
Related Solutions
View the corresponding solution by inspection task
Common Question
The Questions Most Often Asked in This Industry
Stamping Is Very Fast: Can Images Be Captured Clearly?
A strobe light source with a very short exposure is usually used to "freeze" the moving workpiece. The usable speed depends on the exposure time and light source brightness and must be tested on site at the real speed.
Is burr inspection difficult?
Burrs are thin with irregular boundaries, so the acceptance criteria are not easy to quantify. The common approach is low-angle grazing light to make the burr cast a shadow, and then to judge by the presence and size of that shadow. The minimum detectable burr must be calibrated.
For visual inspection in this industry, what needs to be solved first?
The implementation constraints commonly seen in this industry center on: "stamping speeds are high, so imaging must freeze motion"; "metal surfaces are highly reflective with pronounced machining marks"; "burrs are tiny with irregular boundaries". These constraints affect both the imaging solution and the cycle-time design. Normally a sample trial is needed to validate before the configuration is finalized.
How does the inspection result interlock with the production line?
For stamping lines, it is recommended to connect the inspection results to a stop interlock: an automatic stop after N consecutive defects, to prevent a die problem from continuing to produce. When used with progressive dies, results can be output per station to make it easier to locate the problem station.
What Equipment Configuration Does This Type of Inspection Generally Require?
Common forms include: "inline inspection device on the stamping line," "multi-station inspection cell for progressive dies," "inspection station integrated with a robot or conveyor line." The specific machine model and quantity depend on the inspection area, minimum defect size and line cycle time, and must be confirmed against site conditions.
Which process steps in this industry benefit most from a visual inspection station?
The most common are: "hole position and count verification"; "burr check"; "appearance defect recognition". Which process steps to actually instrument depends on the cost of defects escaping downstream and the cost of rework — the later a defect is found, the higher the cost.
How do we judge whether our product is suitable for visual inspection?
Please provide conforming parts and parts with known defects (short shot, burrs, deformation), and state the stamping speed and the number of die stations. In general, as long as the acceptance criteria can be stated clearly, defects image clearly and consistently, and the cycle time matches the field of view, the project is feasible.
What inspection accuracy can be achieved?
Accuracy is not a fixed value that holds regardless of conditions. To be added — the minimum detectable size depends on the combination of field of view and camera resolution, and is also affected by illumination, lens and algorithm; the configuration must be derived from your minimum defect size and validated by measurement.
Submit sample testing
Please provide good parts and known defect parts (short shot, burrs, deformation), and state the stamping speed and number of die stations.
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Need to assess imaging conditions, defect criteria and cycle time item by item? Go to the Full Requirement Assessment →
Inspection Configuration Based on Your Industry's Products and Cycle Time
Send us photos of the workpiece, the inspection requirement (what to inspect, and the tolerance for escapes and false calls), and the line cycle time, and our solution engineers will recommend the inspection method, optical solution, and interlocking configuration for that industry.