![fisheye paint defect fisheye paint defect](https://farm8.staticflickr.com/7766/28054214024_56fc2260e3_b.jpg)
This mold defect is because of the shifting moldingįlashes. Normal rough surfaces can not be judged as defects, but too rough Sometimes, it is because of the low metal temprature melted, or unreasonable gating and venting system.Ĭoarse surface is also a kind of surface defect. Small water flow traces on the surface of metal castings. It is also called as rat tail, which looks like many This defect is caused by the poor metal temperature melted, or poor sand molds. It is a type of surface defect, which cause irregular This defect is not serious as shrinkage cavity, but still cause poor surface quality and may have some inside defects, so foundries should try their best to solve or improve it. Looks like depressed region on the surface of metal castings.
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This defect is also a type of shrinkage defect, which Foundries could improve their gating and venting system, then could solve these shrinkage problems. Type of serious shrinkage defect, you can see these holes easily on the rough surface of the metal castings. These are also called as shrinkage holes, which is a The metal density is very poor, many small holes could be seen after machining. The following photo is showing the porosity shrinkage. For large porosity on the surface, you could see them easily, but for small dispersed shrinkage, you may see them after machining. Shrinkage defects include dispersed shrinkage, micro-shrinkageĪnd porosity. This is a kind of incomplete casting defect, whichĬauses the casting uncompleted. Actually, large flash is a casting problem, the foundry should improve it by modifying the patterns, but small fins and burrs are not casting defects, foundries just need to grind and remove them. Sharp fins and burrs are similar problems as the flash. Removed during cleaning and grinding process. Projection out of surface of metal castings. Joint flash is also called as casting fin, which is a thin Normally, this position may cause air leakage, moreover, the material quality at this position will be very poor, so may be fragile. Cold lap is because of low melting temperature or poor gating It is the problem of sand mold, or the flow speed of the metal is too high, so could be solved by foundries. The sand dropped from sand molds, rolling into the liquid metal, then caused sand holes.
![fisheye paint defect fisheye paint defect](http://www.conformalcoatinghelp.com/wp-content/uploads/2016/02/Fisheyes-200-square.jpeg)
Holes after sand blasting or machining process. Sand hole is a type of typical shrinkage cavity defect.
![fisheye paint defect fisheye paint defect](https://airbrushdoc.com/wp-content/uploads/2012/03/orange-peel.jpg)
The metal has penetrated into sand molds.īlacking scab. Normally, you could see extra metal materials at the corner positions. If the surface is flat, our dandong foundry could inspect them by ultrasonic flaw detector.Ĭhemical burn-on, and metal penetration. The most of subsurface blowholes could be found after machining or grinding. Subsurface blowhole only can be seen after machining or grinding. Pinhole is very tiny hole, some could be seen on the surface. Is a kind of cavities defect, which is also divided into On the surface and inside of cast iron and cast steel parts. ┆ About Us ┆ Casting Products ┆ Casting Workshop ┆ Machining Workshop ┆ Inspection ┆ Certificate ┆ Blog Articles ┆ Contact Us ┆Ĭasting defects with many pictures by Dandong Foundry in Casting Defects - Sand Mold, Metal Casting