Die Casting
For die casting and post-processing, providing visual inspection solutions for short shot, porosity, flash, missing inserts and appearance defects.
Industry Production characteristics
How This Industry Produces Determines How Inspection Should Be Done
The visual inspection of die casting 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 "casting surfaces are rough, and natural texture is easily confused with defects"; "hot workpieces show thermal radiation and deformation after demolding". 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 die casting are Fast cycle times, large thermal fluctuations in the mold, and defect types strongly correlated with process parameters. With the same mold, changes in mold temperature or injection parameters can make the produced parts look noticeably different.
The value of visual inspection on the die casting floor lies in Detect process drift quickly: defects such as short shot, cold shut and porosity often appear in batches; spotting them one minute earlier can save a whole batch from scrap.
Industry Inspection issues
Where problems actually occur on site
- Short shot, incomplete fill, cold shuts
- Flash, overflow
- Blowholes, shrinkage porosity (surface manifestation)
- Insert missing or offset
- Ejection deformation and scuffing
Typical Inspection Objects
The Most Common Inspection Objects in This Industry
Typical Inspection Task
The judgments to be made on these objects
- Short shot and cold shut recognition
- Flash check
- Insert presence/absence and position confirmation
- Surface defect identification
- Count check
Vision Inspection Challenges
Implementation constraints specific to this industry
- Cast surfaces are rough, and their natural texture is easily confused with defects
- Hot workpieces give off heat radiation and deform after demolding
- Multi-cavity molds require cavity-by-cavity judgement
- Insert positions drift with the condition of the mold
Choosing the right algorithm
Choose by Acceptance Criteria Form, Not by How Advanced It Is
Anomaly Detection
Defect forms vary widely, so model the normal state to identify them
Region presence
Insert presence/absence and position
Object Segmentation
Cavity-by-cavity judgement for multi-cavity molds
acquisition and light source
Optical conditions set the upper limit of feasibility
- Grazing light helps highlight the boundaries of short shots and cold shuts
- High-temperature workpieces require heat-resistant lighting and camera protection
- For multi-cavity inspection, separate cavity illumination is recommended to avoid mutual interference
OK / NG Judgement
How results are judged and used
| Inspection Status | judgement | Interlocking Action |
|---|---|---|
| Appearance and insert pass | OK | release |
| Short shot / flash / defect present | NG | Reject and record the cavity number |
| Missing Insert | NG | Reject and treat as missing part |
PLC and Automation Interlocking
How results connect to the production line
Recommended output Cavity number and defect type distribution, to determine whether the cause is the mold, the parameters, or insert loading.
For consecutive defects, triggering a stop signal is recommended to avoid continued scrap.
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
Cast surfaces are rough - can small defects still be detected?
This is fairly difficult. A rough surface has a great deal of texture of its own and is easily confused with defects. A workable direction is: first use illumination design to make the defect features stand out (such as the boundary of a cold shut or the contour of a short shot), then identify them by anomaly detection, rather than trying to quantify every tiny defect.
Can Hot Workpieces Be Inspected Directly?
The effect of thermal radiation on imaging and the equipment's temperature tolerance must be considered. In some scenarios it is better to inspect after the workpiece has cooled, or to use high-temperature illumination and a protective enclosure. The specific solution must be determined together with the production line layout.
For visual inspection in this industry, what needs to be solved first?
The implementation constraints commonly seen in this industry center on: "casting surfaces are rough, and the natural texture is easily confused with defects"; "high-temperature workpieces emit heat radiation and deform after demolding"; "multi-cavity molds require cavity-by-cavity judgement". 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?
It is recommended to output the cavity number and defect type distribution, to determine whether the cause is the mold, the process parameters or insert loading. For consecutive defects, triggering a machine stop signal is recommended to avoid continuous scrap.
What Equipment Configuration Does This Type of Inspection Generally Require?
Common forms include: "inline inspection device beside the die casting machine", "multi-cavity inspection cell", "inspection station matched to the take-out robot". The specific machine model and quantity depend on the inspection area, the minimum defect size and the line cycle time, and must be confirmed according to the site conditions.
Which process steps in this industry benefit most from a visual inspection station?
The most common is: "short shot and cold shut recognition"; "flash check"; "insert presence/absence and position confirmation". Which process steps to actually instrument depends on the cost of defects escaping downstream and 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 a good casting and parts with known defects (short shot, flash, cold shut, missing insert), and state the number of mold cavities and the part removal method. In general, as long as the criteria can be stated clearly, defects can 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 castings and known defective parts (short shot, flash, cold shut, missing insert), and state the number of mold cavities and the part removal method.
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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.