sand mold machine

automatic molding machine - delin machinery

automatic molding machine - delin machinery

This Is An Automatic Molding Machine To Replace Traditional Manual Hand Molding Method. It Has Compact Structure And High Safety Performance, Easy To Operate, Cover Small Floor Space And Make Low Noise.

The sand molding machine is widely used in manufacture castings, machinery parts, auto and motorcycle parts, valves, bearings, cylinder head, flywheel housing, brake caliper, but also pipe fitting, shaft, covers, like T joint, elbow, clamp, etc. More competitive for those products require inner sand core. We also support customized, customer can send us sample pictures, then we will make a good recommendation for you.

automatic flaskless molding machine for foundry sand manhole cover casting - hezhi foundry machinery

automatic flaskless molding machine for foundry sand manhole cover casting - hezhi foundry machinery

Flaskless horizontal parting type green sand molding machine dont need flask.its an improved version of sand molding machine,Patterns are moved to the middle and two half iron molds will close.Green sands are injected into molds and hydraulic power of two half molds will compact the sand molds.

Qingdao Hezhi is a manufacturer for Foundry Machinery & Shot Blasting Machine since 2005. Products cover Moulding Equipment,Sand Reclamation Equipment, Sand Mixer, Dust Collector and Shot Blasting Machine,sand blaster.

We owned3600m2work shop area for production with 210 cranes. Another2600m2space is planned for extension. ISO9001 & CEis achieved. Full set of production ,QC(3 staff) and after-sales (3 staff) guarantee none-defective products. 3D Solidworksis used in designing. R&D staff with over 20 years expertise experience meet your customized requirements.

flaskless molding machines by sinto america, foundry manufacturer

flaskless molding machines by sinto america, foundry manufacturer

Sinto America has a wide line up of flaskless molding machines which can be adapted to your specific production output needs: compact models at reasonable prices, 2-station or 4-station models ideal for sand molds with many cores, high-speed molding models, etc. Sinto has multiple flask sizes to choose from, from 14"x19" to 30"x 32" and mold rates up to 200 molds/hr! Switch from manual molding to automatic molding without compromising quality! Select the best flaskless molding machine for your business based on mold rate and flask size! Sinto also offers a full lineup of tight flask molding machines! Learn about the tight flask line here.

casting defects - sand mold, metal casting

casting defects - sand mold, metal casting

Introducing various metal casting defects with many pictures by Dandong Foundry in China. These are the common sand casting defects on the surface and inside of cast iron and cast steel parts. 1. Blowhole and Pinhole This is a kind of cavities defect, which is also divided into pinhole and subsurface blowhole. Pinhole is very tiny hole, some could be seen on the surface. Subsurface blowhole only can be seen after machining or grinding.

This defect includes chemical burn-on, and metal penetration. Normally, you could see extra metal materials at the corner positions. This is caused by the poor sand. The metal has penetrated into sand molds.

Sand hole is a type of typical shrinkage cavity defect. You could see the empty holes after sand blasting or machining process. The sand dropped from sand molds, rolling into the liquid metal, then caused sand holes.

It is also called as cold shut. It is a crack with round edges. Cold lap is because of low melting temperature or poor gating system. This is not just surface defect. Normally, this position may cause air leakage, moreover, the material quality at this position will be very poor, so may be fragile.

Joint flash is also called as casting fin, which is a thin projection out of surface of metal castings. Joint flash should be removed during cleaning and grinding process.

Sharp fins and burrs are similar problems as the flash. 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.

Shrinkage defects include dispersed shrinkage, micro-shrinkage and porosity. For large porosity on the surface, you could see them easily, but for small dispersed shrinkage, you may see them after machining. The following photo is showing the porosity shrinkage. The metal density is very poor, many small holes could be seen after machining.

These are also called as shrinkage holes, which is a type of serious shrinkage defect, you can see these holes easily on the rough surface of the metal castings. Foundries could improve their gating and venting system, then could solve these shrinkage problems.

This defect is also a type of shrinkage defect, which looks like depressed region on the surface of metal castings. 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.

It is also called as rat tail, which looks like many small water flow traces on the surface of metal castings. Sometimes, it is because of the low metal temprature melted, or unreasonable gating and venting system.

This mold defect is because of the shifting molding flashes. It will cause the dislocation at the parting line. Near the parting line, the left side may be several milimeters lower or higher than another side. The parting line is not defect, but if the left side has different height as the right side, it will be one casting defect. If there is no special requirement, mismatch smaller than 1mm is allowable. No any mismatch is impossible for sand casting process.

This is not casting defect, but it is a real casting quality problem you may meet. It is the damage during machining or delivery processes. The workers should pay more attention to this problem.

This defect is also called as exogenous inclusion, entrapped slag. Normally, the slag is from melted metal. During metal melting process, foundries should remove the dirt and inclusion completely, otherwise, these inclusions will be poured into the castings.

This is also called as under-nodulizing defect. Because of many reasons, the spheroidization of graphite for ductile iron will be affected, therefore, caused the bad spheroidization rate. By metalloscope, you can see very few graphite balls, and many worm-like graphite.

It means the uneven hardness on the same surfaces. The hardness is not uniform, some postions may have extra high hardness. When machining to harder positions, the machining will become more difficult. The drill bit may be broken.

It is also called as sand crush. Some sand blocks dropped from the sand mold, so they will cause the similar shaped sand holes or incomplete. This is the problem of sand molds. The sand molds may not be tight enough.

This problem will cause the oversized tolerance for flatness and straightness. This is very common defect for long castings, and flat castings with thin wall thickness. The reasons are the natural deformation during cooling process in sand molds, or in air, sometimes, the overly sand blasting also could cause this problem.

After welding repair, even after machining or grinding, the welding marks will still be visual. As for unimportant casting surfaces, if the client allow welding repair, then these marks should be acceptable. But for high pressure-bearing positions, or the client has clearly forbidden any welding repair, then these marks will be taken as defects.

Chill iron could effectively reduce the shrinkage for the key positions, so using chill iron is very common in iron foundries. However, the edges of chill irons could be clearly found by visual inspection. Some clients will not require to grind them if these marks do not affect the appearance. However, the clients could require the casting manufacturer to grind them just for better surface looking. Please clearly notice that these marks should not be judged as the casting defects. Refer to

It is also called as "white iron". The surface of the castings with this defect will be extremely white, shiny and smooth. The defective castings will be fragile and crispy, so during machining, some edges and tips will be broken. This defect was caused by the low temperature of sand molds, and prematurely out of sand molds, so the hot iron become chilled quickly. The proper annealing heat treatment to them could solve this defect.

On metallograph photo, you could see many fish-bone free carbide. This is a serious defect of cast iron material, normally happen to ductile iron. Because of inverse chilling defects and poor inoculation, there will be mass free carbide, which will cause fragile, poor welding property to ductile iron castings. High temperature annealing heat treatment could improve its quality.

This defect is also called as internal sweating. There are iron beans in the castings. This is because of unreasonable gating design, which caused some liquid iron became beans suddenly, then these beans were wrapped by other liquid irons. This is a surface defect, but will cause serous problem if they located in key positions.

There is very thin iron skin on the surface of castings. Two layers. This is because of unreasonable gating system, which caused very thin air layers existed. This defect is a surface defect, so normally it can be grinded off. However, it should be discarded if it is not just on the surface.

This defect is a kind of material problem. It is caused because of low pouring temperature and high content of carbon element. This defect is very harmful, will cause material very fragile. On the broken surface, you can see the obvious black surface caused by this defect.

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