There is also a lot of room for the application of mold temperature machines in the die-casting industry, especially in the manufacture of magnesium alloys and aluminum alloys. Uneven or inappropriate mold temperatures will cause the size of the casting to be unstable, and the ejection of the casting will be deformed during the production process. Defects such as thermal pressure, mold sticking, surface depression, shrinkage cavity and hot bubble. It also has an impact on the production cycle, such as filling time, cooling time and spraying time all produce unstable variables. The life of the mold will also cause thermal cracking of the expensive steel due to the impact of overcooling and overheating, which accelerates its aging. Advantages of applying extrusion die casting process on traditional die casting machine The traditional die-casting process and equipment technology have been quite perfect, especially the horizontal cold-chamber die-casting machine and horizontal die-casting process. Its injection and mold clamping devices have strong process adaptability. Therefore, if the squeeze casting process cannot be combined with traditional die-casting equipment, its wide application will be restricted. After this step, another branch of squeeze casting technology will appear, which is squeeze die casting technology. In other words, applying squeeze casting technology on the basis of traditional die casting machine is squeeze die casting technology. According to the characteristics of extrusion die-casting process, the traditional die-casting machine is improved and transformed accordingly. This equipment is a brand-new extrusion die-casting machine.

In the die-casting machine manufacturing industry, if the market share of large machines is low, it means that the company has no say in the industry. Ten years ago, the situation of China's die-casting machines was exactly the same. For large machines above 2000T, leading domestic die-casting companies tended to favor European and Japanese brands. Yizumi, who first embarked on the journey of entrepreneurship with small and medium-sized models, has been focusing on the development of large machines. Since 2006, it has designed * 1650T die-casting machines, and now has an annual output of nearly 50 units, and the market stock exceeds 250 units, covering 90% of the country. Leading die-casting companies around the world account for more than 40% of sales and are growing at a double-digit rate. After ten years of sharpening the sword, Yizumi Daji has entered a golden age of development.

Congratulations to Longhua on the successful delivery of the cold chamber die casting machine in the factory！   Bengbu Longhua , founded in Bengbu, Anhui Province of China ,in 1982, is a professional high-tech enterprise engaged in the design, manufacture and sale of cold chamber die casting machine, die casting peripheral equipment, oil field equipment and new energy equipment (natural gas, nitrogen, wellhead, casing, raw materials, liquefied petroleum gas, special gas, compressor).   On November 7, 2017, Longhua won the national high-tech enterprise certificate!   On June 26, 2019, Longhua was successfully listed in the National Science and Technology Innovation Special Edition!   On November 24, 2019, Bengbu Longhua and the "Hefei Institute of the Chinese Academy of Sciences" signed the "Intelligent High Speed, High Precision Die Casting Machine" project, which has been included in one of the four high-end manufacturing projects in Bengbu!   Longua intelligent die-casting machines are applicable to manufacture of automobile and motorcycle parts (engine cylinder block, cylinder head, crankcase, hinged door covers, oil pan, gearbox housing, gearbox end cap, dashboard, etc.), electric escalator handrail/steps, industrial/road/railway/air/agricultural machinery, spotlight shells, building material parts, furniture, aluminum arts, copper arts, magnesium alloy products, non-ferrous metal processed products and other die casting products.   Longhua die-casting machine and oilfield equipment products are exported to: Brazil, Egypt, South Africa, Vietnam, Pakistan, Bangladesh, Uruguay, India, Russia, kazakhstan, kyrgyzstan, Ukraine, Iran, Iraq, north Korea, Japan, Ecuador, the United States, South Korea, Algeria, China Taiwan and other countries and regions.   Longhua’s quality goal is that "Today’s quality means tomorrow's market".

2020 CHINA DIECASTING International Die-casting Exhibition & CHINA NONFERROUS Shanghai Non-ferrous Exhibition is about to open! There have been a lot of questions about the exhibition in recent months. Is it safe to visit the exhibition this year? What materials are needed to enter the pavilion? ◆ When can I enter the pavilion? How do I get to the pavilion? ◆ Are there any simultaneous activities on site? Now it's time for a solution! FAQ for exhibition viewing Q:What are the changes in the process of entering the pavilion this year due to the epidemic? A:This year, all visitors must meet four requirements at the same time: consistent identification (face recognition), wearing a mask, showing a green code and a body temperature not exceeding 37.3 degrees Celsius. No one can enter the exhibition hall if any of the conditions do not meet the regulations. Q:Where do I get the random code? A:Available with bid, alipay, WeChat or scan the qr code below. Q:Can I enter the exhibition hall with yellow code? A:Only the green code is allowed. Q:What are the requirements for visitors from or through high-risk areas to enter the Pavilion? A:Novel Coronavirus nucleic acid test report and green travel code must be presented before entering the novel coronavirus within 7 days. For specific implementation measures, please refer to "Shanghai will continue to strengthen the management of people coming to Shanghai and returning to Shanghai from or through high-risk areas in China". Q:What is the real-name admission system? A:All exhibition documents must provide id number application. The site with the original registered ID card, through the gate brush id card and face recognition after admission. People from Hong Kong, Macao and Taiwan regions and foreign nationals with permanent residence in China must show their valid credentials and take a photo at the registration counter before they are allowed in. Q:Do I need to make an online reservation for the exhibition in advance? A:All visitors are required to register their real names online before the exhibition and choose the time to visit. In case of peak passenger flow, please follow the instructions of the staff and attend the exhibition in batches. Q:What other epidemic prevention measures have been taken at the exhibition site this year? A:1. Carry out regular key disinfection of all high-frequency contact areas. The exhibition hall or outdoor awning public areas, corridors, passageways, toilets and other places should be disinfected at least once a day, and relevant sanitation disinfection records should be kept. Dustbins (buckets) shall be cleaned and disinfected at least once a day; The toilets in the exhibition area shall be ventilated to ensure the normal use of water supply, dryers and other facilities. Eat in designated dining areas or restaurants, avoid concentrated meals; 2. During the exhibition, alcohol-free hand sanitizer will be provided at the main entrance and exit of each pavilion for disin...

Low pressure casting concept Low-pressure casting means that the casting mold is generally placed above a sealed holding furnace containing alloy liquid. Compressed air is introduced into the holding furnace to cause a low pressure (conventional 500-2500 mbar) on the surface of the molten metal, so that the liquid metal is connected by the furnace A riser tube inside the metal and mold cavity rises to fill the mold and controls the method of solidification casting. This casting method is well packed, the castings are densely organized, and it is easy to cast large and thin-walled complex castings. Generally, no riser is required, and the metal recovery rate is high (generally more than 70%). Easy to automate. Compared with high pressure casting, the equipment cost is lower, but the production efficiency is lower. Compared with gravity casting, it is generally used to cast nonferrous alloys. Low-pressure casting features Low-pressure casting can use sand, metal, graphite, gypsum, etc. 1) Filling with pure metal liquid improves the purity of castings. Because the slag generally floats on the surface of the molten metal, and low-pressure casting is realized by the molten metal in the lower part of the holding furnace through the riser tube, effectively avoiding the possibility of the slag entering the mold cavity. However, the dross caused by repeated scouring inside the riser tube requires precautions, and a filter screen is generally placed during the casting process. 2) The pressurized pressure curve is adjustable. If the setting is reasonable, the filling of the liquid metal is stable, which reduces or avoids the phenomenon of tumbling, impact, and splashing of the liquid metal during filling, thereby reducing the formation of oxidized slag. 3) The moldability of the casting is good, and the filling of the molten metal under pressure can improve the fluidity of the molten metal, which is beneficial to the formation of castings with clear outline and smooth surface, and is more beneficial to the molding of large thin-walled castings. 4) The casting is crystallized and solidified under the action of pressure, which can be fully compensated and the casting structure is dense. 5) The recovery rate of the molten metal is improved. In general, no riser is needed, and the uncondensed metal in the riser can be returned to the crucible for repeated use, which greatly improves the recovery rate of the molten metal. Generally up to more than 70%. 6) The production operation is convenient, the labor conditions are good, the production efficiency is high, and it is easy to realize mechanization and automation. With the improvement of intelligence and automation technology, an automated casting line with one person, multiple machines or unmanned operation can be realized. Low-pressure casting plus common alloys Aluminum alloy, magnesium alloy, copper alloy, etc. Low-pressure casting conventional casting types Wheels of vehicles such as automobiles, motorcycle...

Die casting, also known as high-pressure casting, is a near-net-shaping technology that has been widely used in the automotive, aerospace, and electronics industries in recent years. During the die-casting process, molten metal (generally light alloy) fills the cavity with high pressure and high speed under the action of the punch, and quickly cools to form the final casting. Die-casting is generally divided into cold-chamber die-casting and hot-chamber die-casting. Cold-chamber die-casting is mainly used for the production of large parts, such as automotive parts and communication base station cooling parts. Hot-chamber die-casting is widely used in the production of small electronic or 3C products. Process, such as USB connector, notebook shell, etc. 1. Die casting has a good automation foundation Compared with the ordinary casting process, die casting is characterized by high speed and high pressure. The products produced are generally light alloy thin-walled parts, but die casting technology is also used in the production of pure copper rotors. Unlike aluminum and magnesium alloys, pure copper The melting point is very high, so short die life during pure copper die casting is a big problem. Among all casting technologies, die casting has the highest degree of automation. Modern die-casting companies use automated die-casting island technology, which highly integrates die-casting machines (generally dozens or even hundreds) to form a fully automated production process. At the same time, using intelligent factory technology, the production process of the die casting machine is monitored, the performance and status of each die casting machine are grasped in real time, and the production process of the die casting machine is adjusted in time through big data measurement and real-time feedback to ensure Final product quality. The real-time control of die casting mold temperature is a simple example: Taking cold chamber die-casting as an example, in the production process, due to the continuous filling of the mold cavity with high-temperature liquid metal, the mold temperature continues to increase. At this time, in order to ensure that the temperature of the mold is not overheated, cooling water is generally used to cool the mold. If the design of the cooling water piping is reasonable, in general, we can ensure that the temperature of the mold reaches the so-called thermal balance by controlling the temperature and flow rate of the cooling water. From this point of view, we can design the cooling water feedback system. After we know the actual value of the mold temperature, we can control the temperature and flow rate of the cooling water through calculation and immediate feedback system, and finally we can control the temperature of the mold. This is a typical application of a smart factory for die casting at this stage. In fact, the above case of intelligent control is just a very small application scenario in the "smart factory". To achieve a ...

In the process of high pressure casting of aluminum alloy, if the injection speed is too high in the low speed stage, on the one hand, a lot of air will enter the mold cavity through the pressure chamber, on the other hand, the aluminum liquid will billow in the pressure chamber, resulting in the increase of the air content of the aluminum liquid, thus affecting the quality of the die casting. If the injection speed is too low, the casting will be cold insulation and bad forming.The specific requirements of low speed are in the low speed interval (0.1-0.5 m/s), uniform or uniform acceleration to gently promote the metal molten liquid, to avoid the metal liquid to produce turbulence and dissolve into the gas, so as to reduce the gas content of the metal liquid, but also make the gas in the mold cavity easy to discharge smoothly. Generally, the injection velocity of this stage is relatively low, generally within 0.1-0.5 m/s. At present, the general calculation formula of low speed can not be directly analyzed from the filling forming effect, resulting in a large deviation of the calculated results. The production personnel only depend on the experience and the repeated debugging to determine the speed parameters in the low-speed stage, which on the one hand causes the process instability and a large number of trial production wastes, on the other hand prolongs the development cycle. Longhua die casting machine co., LTD. Has 38 years of experience in die casting machine production, and cooperated with hefei institute of Chinese academy of sciences to develop the latest and most scientific die casting machine production technology, which can completely solve the problems of die casting such as pores, sand holes and so on, and greatly improve the quality and precision of casting. Longhua die casting machine co., LTD., a professional die casting machine manufacturers, die casting technical experts.

  Today, Longhua Technology will share with you the basic structure and working principle of natural gas compressors. 1.Basic structure  Natural gas compressors are reciprocating piston compressors, which are mainly composed of three parts: moving mechanism (crankshaft, bearing, connecting rod, crosshead, pulley or coupling, etc.), working mechanism (cylinder, piston, valve, etc.) and Body. There are also three auxiliary systems, namely the lubrication system, the cooling system and Regulation system.   Movement mechanism: including crankshaft, connecting rod, crosshead, piston rod, etc. The motion mechanism is a crank-link mechanism that changes the rotational movement of the crankshaft into a reciprocating motion of the crosshead. Usually, the driving machine drives the crankshaft to rotate through a coupling or a flywheel (belt pulley). The crankshaft is connected to the large end of the connecting rod, and the small end of the connecting rod is connected to the crosshead. The crosshead is limited to the body slide and can only perform reciprocating motion.   Working mechanism: Including cylinder, piston, air valve, etc. The working mechanism is the main component to realize the working principle of the compressor. The cylinder is generally in the shape of a barrel, and there are several inlet and exhaust valves at both ends. The body is used to support and install the entire movement mechanism and working mechanism, and it is also used as a lubricating oil tank. The crankshaft is supported on the body by a bearing. The slide on the body supports the crosshead. The cylinders are fixed on the two arms of the body. . 2. Working principle   The reciprocating compressor uses a crank and linkage mechanism to change the rotary motion of the driver into the reciprocating motion of the piston. The cylinder and the piston together form a working chamber to achieve gas compression. The piston reciprocates in the cylinder to allow the gas to complete the air intake in the cylinder. , Compression, exhaust, etc. The intake and exhaust valves are used to control the gas entering and exiting the cylinder, and the pressure of the gas is increased during the compression process, thereby achieving the purpose of pressurizing the gas.