Zinc Truck And Alloy Metal Car Toy Led Die Aluminium Casting Cast Aluminum Parts Aluminium Casting Parts

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Oxidized slag inclusions
Defect features: Oxidation slag inclusions are mostly distributed on the upper surface of the casting, at the corners of the casting mold that are not ventilated. Fractures are mostly gray-white or yellow, which can be found by X-ray fluoroscopy or machining, and can also be found in alkali cleaning, pickling or anodizing.
cause:
1. The charge is not clean, and the amount of returned charge is too much
2. Poor design of gating system
3. The slag in the alloy liquid is not cleaned up
4. Improper pouring operation, bringing in slag inclusions
5. The standing time after refining and metamorphism is not enough
Prevention method:
1. The charge should be sand blown, and the amount of returned charge should be appropriately reduced
2. Improve the design of the gating system and improve its slag blocking ability
3. Use appropriate flux to remove slag
4. When pouring, it should be stable and pay attention to slag blocking
5. After refining, the alloy liquid should be left for a certain period of time before pouring
stomatal bubble
Defect characteristics: The pores in the wall of the three castings are generally round or oval, with a smooth surface, usually shiny oxide skin, and sometimes oily yellow. Surface pores and air bubbles can be found by sandblasting, and internal air pores and air bubbles can be found by X-ray fluoroscopy or mechanical processing. The air bubbles are black on the X-ray film.
cause:
1. The pouring alloy is not stable and is involved in gas
2. Organic impurities (such as coal dust, grass-roots horse manure, etc.) are mixed into the sand (core)
3. Poor ventilation of mold and sand core
4. There are shrinkage holes on the surface of the cold iron
5. Poor design of gating system
Prevention method:
1. Correctly control the pouring speed and avoid getting involved in the gas.
2. The molding (core) sand shall not be mixed with organic impurities to reduce the gas generation of the molding material
3. Improve the exhaust ability of (core) sand
4. Correct selection and handling of cold iron
5. Improve gating system design
Shrinkage
Defect characteristics: shrinkage porosity of aluminum castings generally occurs at the thick part of the root of the fly riser near the inner runner, the thickness transition of the wall, and the thin wall with a large plane. In the as-cast state, the fracture is gray, and the light yellow is gray-white, light-yellow or gray-black after heat treatment. It is cloudy on the X-ray film. Serious filamentous shrinkage can be found by X-ray, fluorescence low-magnification fracture and other inspection methods.
cause:
1. Poor feeder effect
2. The gas content of the charge is too much
3. Overheating near the runner
4. There is too much moisture in the sand mold, and the sand core is not dried
5. Coarse grains of alloy
6. Improper position of the casting in the mold
7. The pouring temperature is too high and the pouring speed is too fast
Prevention method:
1. Refill the molten metal from the riser to improve the design of the riser
2. The charge should be clean and free of corrosion
3. The riser is set at the shrinkage of the casting, and the cold iron or the cold iron is used in combination with the riser.
4. Control sand moisture, and sand core drying
5. Take measures to refine the product
6. Improve the position of the casting in the mold to reduce the pouring temperature and pouring speed
four cracks

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Company Profile

Jiangyin Longkang Metal Products Co., Ltd. is located in Zhouzhuang Town, Jiangyin City - the largest aluminum extrusion profile production base. Covering an area of more than 35,000 square meters with more than 350 employees. We focus on metal customization, special-shaped aluminum profiles, aluminum profiles, aluminum tubes, rail transit series, doors and windows aluminum profiles, heat sinks, CNC processed aluminum profiles, interior decoration series, bending series, etc. We also have precision anodizing and various surface treatments, such as PVC film, wood grain, electrophoresis, powder coating, anodizing, etc. After more than 20 years of development, The company has become a modern aluminum production enterprise with perfect quality management system.

The company has the ability to develop and design molds independently, we can produce any extruded aluminum profiles according to your mechanical drawing or sample. Longkang has 10 extrusion production lines (600-3500 tons), one automatic oxidation electrophoresis production line, vertical and horizontal spraying production line per each, and a variety of advanced supporting production, processing and testing equipments. There are also CNT digital control drilling and milling machine(CNC), double head saw, hydraulic saw and punching machine in our processing workshop. The complete technological process can benefit to reduce the production turnover times for semi-finished products, to avoid the damage during transportation, improve the production efficiency, reduce the cost of production,and to ensure the quality and delivery time.

Efficiently treating our customers as partners with sincerity, specialization and satisfaction is our managerial principle. Attributed to the backup of a dedicated technical team, filled with wide and profound knowledge and practice in aluminum profile and world trade for 20 years, the company owns rich experience in product quality control and profile physical properties such as Hardness, Stretchability, Flatness, Straightness, and Tolerance etc. In line with the principle of sharing the preferential cost and joint development, the company has formed an interest community for years with its customers at home and abroad. Sincerely to build up a pleasant mutual trust, cooperative, win-win and value-added sustainable partnership is what we are achieving to grow together with you!

FAQ
Q: How long can I receive the goods after placing the order?
A: 15-30 working days after receiving the deposit (depending on the quantity).

Q: What is the thickness of the anodizing? Can you do 12um?
A: Our normal thickness is about 10 um. Yes, we can do 15 microns and above.

Q: What colors can powder coatings be used for? The thickness of the powder coat?
A: We can do any color for powder coating as long as you can provide color samples. Our usual powder coating thickness is 60-80um.