Longhua uses the world's unique liquid nitrogen (minus -196 ℃) die-casting machine assembly structure assembly process (thermal expansion and contraction), which can completely guarantee that the die-casting machine assembly structure has zero failure rate in production. Liquid nitrogen: liquid nitrogen. It is inert, colorless, odorless, non-corrosive, non-flammable, and extremely low temperature. Nitrogen makes up most of the atmosphere (78.03% by volume and 75.5% by weight). Nitrogen is inactive and does not support combustion. Frostbite caused by a large amount of endothermic contact during vaporization. Under normal pressure, the temperature of liquid nitrogen is -196 ° C; 1 cubic meter of liquid nitrogen can expand to 696 cubic meters of pure gaseous nitrogen at 21 ° C. Liquid nitrogen is a colorless, odorless liquid and gas that is cold at high pressure. Liquid nitrogen (often written as LN2) is a liquid form of nitrogen formed at low temperatures. The boiling point of nitrogen is -196 ° C. If the temperature is lower than normal atmospheric pressure, liquid nitrogen will be formed; if pressurized, liquid nitrogen can be obtained at a higher temperature. In industry, liquid nitrogen is obtained by fractional distillation of air. After the air is purified, it is liquefied in a pressurized and cooled environment and separated by the different boiling points of the components in the air. Nitrogen (78.09% of the volume of air) was first leached (and not liquefied), followed by 0.93% of the rare gas in the air, and finally 20.95% of oxygen. There is no problem with the human skin's direct contact with liquid nitrogen immediately, it will frostbite and irreversible after more than 2 seconds.

There will be some defects when casting the die castings. Today, Longhua Die Casting Machine will take you to analyze the causes and solutions of the defects, and let us take a look. Porosity and Bubble Analysis of Cast Aluminum Alloy Defects Defect characteristics: The pores in the wall of the three castings are generally round or oval, with smooth surfaces, generally shiny oxide scales, and sometimes oil yellow. Surface pores and air bubbles can be found by sandblasting, internal pores can be found through X-ray fluoroscopy or mechanical processing. The air bubbles appear black on the X-ray film. cause: 1. Casting alloy is not stable and is involved in gas 2. Type (core) sand mixed with organic impurities (such as coal dust, grass roots, horse dung, etc.) 3. Poor ventilation of molds and cores 4. Shrinkage on the surface of cold iron 5. Pouring system design for non-casting aluminum alloy defect analysis Prevention method: 1. Correctly control the pouring speed and avoid being involved in gas. 2. Mould (core) sand must not be mixed with organic impurities to reduce the amount of gas generated by the modeling material 3. Improving the venting ability of (core) sand 4.Proper selection and handling of cold iron 5.Improved design of the pouring system Defect features: Shrinkage of aluminum castings generally occurs in the thick parts of the riser root near the inner runner, the thickness of the wall, and the thin walls with large planes. In the as-cast state, the fracture is gray, and the light yellow is grayish white or yellowish or grayish black after heat treatment. It is cloud-like and severely filiform on the x-ray film, which can be found by X-ray, low-fluorescence fracture and other inspection methods. cause: 1. Poor feeding effect of riser 2. Too much gas content in the charge 3.Overheating near the pouring gate 4.Excessive moisture in the sand mold, the core is not dried 5.Coarse alloy grains 6. Casting is not properly positioned in the mold 7. The pouring temperature is too high and the pouring speed is too fast Prevention: 1. Refilling metal liquid from the riser to improve the design of the riser 2. The charge should be clean and non-corrosive. 3. A riser is set at the shrinkage of the casting, and cold iron or a combination of cold iron and riser is placed 4.Control sand moisture and core drying 5.Take measures to refine the granules 6. Improve the position of the casting in the mold and reduce the pouring temperature and pouring speed. Defect characteristics: 1. Casting crack. It develops along the grain boundary, often accompanied by segregation. It is a crack formed at higher temperatures. Alloys with larger volume shrinkage and more complex shapes are prone to appear 2. Heat treatment crack: caused by heat treatment overheating or overheating. Often, alloys with large stresses and thermal expansion coefficients are cooled excessively. Or in the presence of other metallurgical defects cause: 1. The structural design of the casting i...

     2020 is another brand new year, and Bengbu Longhua Die Casting Machinery Co., Ltd. has also embarked on a new journey. At the beginning of the new year, Bengbu Longhua received good news—with a professional team, strong technical strength, continuous innovation ability, and scientific business management, Bengbu Longhua Die Casting Machine successfully passed the international SGS field inspection again.

     We all know that the composition of die-cast aluminum is different from that of profile aluminum. Therefore, the surface treatment methods of die-cast aluminum alloy and profile aluminum will also be different, which often leads to the difficulty of determining the surface treatment method of die-cast aluminum alloy or it is impossible to determine directly Today, Bengbu Longhua Die Casting Machine will introduce some die-casting aluminum alloy surface treatment methods to everyone, hoping to have inspiration for everyone.      There are many kinds of surface treatment methods for die-casting aluminum. Which process method is used to treat die-casting aluminum alloy depends on the quality requirements of the product. Currently, there are more common surface treatment methods: 1, if the surface quality requires an aluminum alloy metal color, you can use polishing or passivation anti-corrosion protection treatment process; 2, if the surface does not require the true color of the aluminum alloy metal, a cleaning or passivation anti-corrosion protection treatment process can be used; 3, if the surface needs various decorative effect colors, it can be treated by cleaning, passivation, painting or electrophoresis; 4, if the surface must be protected by plating metal, cleaning and plating can be used; 5, if the product requires high corrosion resistance, you can use cleaning, activation, passivation treatment, or passivation treatment followed by sealing and spraying treatment; 6. At present, in the industry of aluminum die-casting treatment, metal conductive oxidation treatment is also used. Now, basically using the above six die-casting aluminum surface treatment methods, I believe that with the development of technology, there will be more and more die-casting aluminum surface treatment methods.

Zinc alloy die-casting is a special process for manufacturing molds. Most of the mold manufacturing in the domestic market today uses this manufacturing technology, especially in the Pearl River Delta in coastal areas and Wenzhou in Zhejiang. The performance of products manufactured using this process is stronger than products manufactured using traditional process manufacturing techniques. Compared with the traditional manufacturing process, the zinc alloy die-casting process has a lot of advantages and characteristics. What are the specific advantages and performance of this zinc alloy die-casting process? The following Bengbu Longhua die-casting machine will introduce the user  in detail. Manufacturing technology of zinc alloy die casting process Zinc alloy die-casting is actually under the action of high pressure, filling liquid or semi-solid metal  materials into the cavity of the die-casting mold at a very fast speed, but also under the condition of relatively large pressure The following is its molding. After cooling and solidifying, a molded product can be obtained. In the production process, the pressure required to use is very large. And compared to the traditional processing method which only requires a die casting machine, the zinc alloy die casting process requires a combination of three types of molds and a fairly mature die casting   process to make a good product. Characteristics of Zinc alloy die casting process 1. The ratio of the product made by the zinc alloy die-casting process is relatively large, and it has a better texture and a heavier weight. The strength of this process is much greater than that of plastic injection molding. 2. The zinc alloy die-casting process has super good casting performance. In addition, this process method can produce more complex and thin-walled products that cannot be produced by traditional processes, and the surface of this product is very Smooth and not rough. 3. The mold produced by the zinc alloy die-casting process can also be surface-processed again, and the surface can be processed by electroplating and painting. 4. Zinc alloy die-casting technology is used to manufacture the mold. Its production efficiency is very high, and the service life of the mold is much longer. It can use up to 10,000 times of die-casting. 5. The zinc alloy die-casting process has a very good product manufacturing effect. The products produced by this technology have very good mechanical properties at room temperature, that is, high temperature will not occur under long-term use. In addition, It also has very good abrasion resistance and will not wear easily. 6. The melting point of the product produced by the zinc alloy die-casting process is relatively low. The product can be melted away at about 385 degrees Celsius, so this product can be better produced. 7. The main point is that the price of the mold produced by the zinc alloy die casting process is much lower than that of the mold produ...

   Aluminum alloy die-casting has been developing continuously for a long time. China's aluminum alloy die-casting industry has made amazing development and has developed into an emerging industry. At present, the process has become one of the most widely used processes in the automotive aluminum alloy forming process. Aluminum alloy die-casting products are mainly used in electronics, automobiles, motors, home appliances and some communication industries. Some high-performance, high-precision, high-toughness high-quality aluminum alloy products are also used in relatively demanding industries such as large aircraft and ships. . The main use is still on some parts of equipment. Aluminum alloy has a wide range of applications, good castability, high dimensional accuracy of castings, good surface roughness, good casting stability, high productivity, high metal utilization rate, easy to save production, and high strength and surface hardness of castings. Five characteristics. 1, durability Aluminium has strong stability and resistance to oxidation, and aluminum alloy castings will not rust and corrosion; the surface is coated with electrostatic powder and fluorocarbon coatings, and various large-scale indoor and outdoor decorative products can be maintained for a long time without discoloration. 2. Plasticity Aluminium has good ductility, which is convenient for various modeling designs. It has toughness, can be used repeatedly, and has a wider range of applications. 3. Security After various rigorous tests, the resistance of aluminum products to earthquake, wind pressure and weathering is guaranteed. The unique aluminum alloy casting method makes the manufactured work lighter, reduces the burden on transportation and construction operations, and reduces danger. 4. Creativeness The motifs are designed by professional designers to lead the world trend. According to the owner's preferences, a separate decoration can be designed to create exclusive home privileges. 5.light weight Aluminium is light in weight, making installation and maintenance more convenient. Bengbu Longhua Die-casting Machine Co., Ltd. has specialized in producing precision aluminum die-casting auto parts for 38 years. It is a key high-tech enterprise of the National Torch Plan.

Special activity: buy die casting machine, free stove Fight against the epidemic! During the epidemic period, in order to thank the new and old customers at home and abroad for their support and understanding, from February 24, 2020 to March 23, 2020, new and old customers purchased our company's die-casting machines during this period and took part of the money Send energy-saving die-casting furnace (electric furnace, natural gas furnace) project. The specific scheme is as follows; Purchase one of our company's die casting machines; After depositing the die casting machine, an additional 1450 USD will be given to 200KG (energy-saving electric furnace or natural gas energy-efficient furnace). After depositing the die casting machine, an additional 2160 USD will be given to 300KG (energy-saving electric furnace or natural gas energy-efficient furnace). After depositing the die casting machine, an additional 2880 USD will be given to 400KG (energy-saving electric furnace or natural gas energy-efficient furnace). After depositing the die casting machine, an additional 4320 USD will be given to 500KG (energy-saving electric furnace or natural gas energy-efficient furnace). After depositing the die casting machine, an additional 5040 USD will be given to 800KG (energy-saving electric furnace or natural gas energy-efficient furnace). After paying the deposit of the die casting machine, an additional 5760 USD will be given to 1000KG (energy-saving electric furnace or natural gas energy-efficient furnace). Offer period: one month Remarks: interpretation right belongs to Longhua Company Bengbu Longhua Die Casting Machine Co., Ltd. February 24, 2020

How to effectively prevent crucible corrosion (as shown in figure)? Longhua technology reminds you: 1, as far as possible to the furnace slag to slag outside the furnace, such operation is to reduce the probability of crucible corrosion;The other is to save the slag refining process and the incubation waiting time after the end.（www.longhuamachine.com/www.diecastingmachinechina.com） 2.Choose the solvent with low content of sodium and chlorine when removing slag, refining, deterioration and covering.Crucible is porous, sodium, chlorine will accelerate the corrosion of the pores to form holes.（www.longhuamachine.com/www.diecastingmachinechina.com） 3.The temperature of slag removal and refining aluminum solution should reach 720 ~ 730℃, because if the temperature is not enough, the solvent cannot react quickly and will be absorbed on the inner wall of the crucible, accelerating the corrosion of the crucible.（www.longhuamachine.com/www.diecastingmachinechina.com） 4. Timely clean the slag on the walls and bottom of the crucible. First, the expansion rate of the slag is larger than that of the crucible when the slag is too thick and the temperature rises, which will lead to the cracking of the crucible;Second, the solvent adsorption or precipitation on the residue of the crucible will accelerate the corrosion of the crucible;Third, please clean in the high temperature phase to prevent physical damage to the crucible.（www.longhuamachine.com/www.diecastingmachinechina.com）