Most die castings are iron free

CNC machining (4) grounding wire specification: according to the regulations issued by the Ministry, the grounding wire must be made of bare copper wire of more than 25mm2. (5) it is mainly used for non horizontal charged movement and high, medium and low voltage circuit breakers and machine tools as cables, hardware and power supporting components..
The refrigerant of Xiamen die casting die manufacturer flows outside the tube. The refrigerant liquid after throttling enters from the bottom or side of the evaporator. The gas after Yanfa is discharged from the upper part of the evaporator. Generally, a few rows of cooling pipes are installed on the upper part of the evaporator or an air bag is welded on the shell to separate the liquid drops before the gas leaves the Yanfa device. A special separation equipment is usually made for large swallow hair machine. A certain amount of liquid refrigerant should be kept in the shell when the shell and tube type swallow hair generator works. The liquid level should be controlled by the float valve. The height of the static liquid level should be about the diameter of the cylinder. Most of the cooling pipes are immersed in the liquid and heat exchange is carried out by the way of liquid to liquid. Therefore, the heat transfer effect is good and the heat transfer coefficient is large. But the liquid level should not be too high, otherwise there will be a phenomenon of liquid return to the refrigerator. Although this kind of evaporator can be used for nitrogen and nitrogen, the tube materials used are different. Generally, ammonia evaporator is made of 4025x2.5-438x3 steel pipe, and fulion generator is made of copper tube or brass tube. When the refrigerant is corrosive, the tube sheet is generally made of corrosion-resistant composite metal plate, and the cooling pipe is made of high-strength aluminum arsenic brass tube. In order to enhance the heat transfer effect of the evaporator, multi fin tubes are used. Generally speaking, the heat transfer coefficient of evaporator is smaller than that of condenser, which is mainly due to the small heat transfer temperature difference.



Guide rail fault diagnosis this level of equipment should supply protection, supervision and control of the load. 3. The last level of power distribution equipment is called lighting power distribution box. They are loose, small capacity distribution equipment away from the power supply. The power distribution system at the construction site shall be distributed in different levels. The rainwater accident pool shall be equipped with a general distribution box (or distribution room). The distribution box shall be set below the general distribution box, and the switch box shall be set below the distribution box, and the electrical equipment shall be set below the switch box. The distribution box and switch box shall be installed firmly and upright. The mobile distribution box and switch box shall be installed on a solid support. The vertical distance between the bottom surface of fixed distribution box and switch box and the ground shall be greater than 1.3m and less than 1.5m. The vertical distance between the bottom of mobile distribution box and switch box and the ground surface shall be greater than 0.6m and less than 1.5m. All distribution boxes and switch boxes must be rainproof Dust. The general distribution box shall be located near the power supply area, and the distribution box shall be installed in the area where the electrical equipment or load is relatively concentrated. The distance between the distribution box and the switch box shall not be more than 30 m. the switch box shall be distributed by the final level distribution box, and the horizontal distance between the switch box and the fixed electrical equipment controlled shall not be more than 3 m. Usually, the customer's requirements for the appearance of explosion-proof distribution box may focus on color problems and surface uniformity. It can only be opened when the concentration is below 1%. After opening the cover, the explosion-proof cover should be put aside gently, and then check the electricity, discharge after confirming that there is no electricity, and connect temporary grounding wire before operation and maintenance. It is forbidden to open the cover for power transmission. Galvanized flat steel for main grounding electrode and local grounding electrode bus; galvanized flat steel for switch connection or local grounding electrode bus; copper wire for auxiliary grounding wire for leakage, signal, lighting and coal drilling protection; the distance between local grounding pole and auxiliary grounding pole shall not be less than 10m.
Aluminum alloy ground wire die casting aluminum alloy most die casting castings are iron free, such as zinc, copper, aluminum, magnesium, lead, tin and lead tin alloys and their alloys. Common die casting alloys: zinc alloy die casting and aluminum alloy die casting. The surface temperature control of aluminum die-casting trimming die is very important for the production of high-quality die-casting parts. During the production process, the casting is deformed, resulting in thermal pressure, die sticking, surface depression, internal shrinkage cavity and hot bubble. When the mold temperature difference is large, the variables in the production cycle, such as filling time, cooling time and spraying time, have different degrees of influence. 1. Cold striation: it is mainly because the temperature at the front end of the melt is too low, and there are traces when it overlaps. 2. Crack: it is because of the shrinkage stress, and it is cracked by force when ejecting or whole edge. 3. Air hole: the air hole is the source of air mixed in the molten soup, and it is in the material pipe, in the mold and the release agent Cavitation erosion: the gas in the molten liquid will expand suddenly due to the sudden decrease of pressure, which will impact the mold and cause damage to the mold. 5. Shrinkage cavity: when the metal solidifies from liquid to solid, the space occupied becomes smaller. If there is no metal supplement, it will form shrinkage cavity. It usually occurs at the slow solidification place Aluminum die-casting trimming die sometimes has the phenomenon of sticking die and material. The aluminum die-casting trimming die introduces the method to solve this phenomenon. 1. Check whether the mold temperature is normal, properly reduce the pouring temperature of alloy liquid and mold temperature; 2. Check whether the proportion of release agent is abnormal, try to change the release agent, adjust the spraying position and spraying amount; 3. Polish the surface of the die casting mold, and polish the nitrided mold carefully to prevent damaging the nitrided layer on the surface and forming the situation of more polishing and sticking, 4. The design structure of gating system should be improved to avoid continuous erosion of cavity wall or core by alloy liquid. 5. The cooling system of mould should be modified, the process parameters of die casting should be adjusted, and the injection speed should be appropriately reduced and the two-speed stroke should be shortened. 6. 
In this way, a lot of wrapping force on the moving die side can be increased, and the die castings can be brought to the moving die. The requirements of die-casting parts on trimming die are very high, and the manufacturers should operate in strict accordance with the specifications when operating the aluminum die-casting trimming die. In view of the appearance of die sticking, corresponding measures should be taken in time to ensure that the produced die castings meet the factory requirements.

Xiamen precision parts processing factory The products produced by this process have high dimensional accuracy, beautiful appearance, good compactness and high strength. Especially T6 heat treatment can be used to make aluminum castings with high strength, hardness and elongation. It is used in some applications with high mechanical properties, such as aviation, automobile, railway, medical and other vehicles. The aluminum wheel hub of automobile is a typical application, which many friends think is used Die casting. This is not true. Aluminum wheel hubs all over the world are made of gravity casting or low die casting. Die casting aluminum castings are filled with a lot of gas, forming a large number of small bubbles. On the one hand, the mechanical properties are reduced. On the other hand, due to the existence of bubbles, T6 heat treatment cannot be carried out and the mechanical properties can not be further improved. And the aluminum alloy composition produced by aluminum alloy die-casting process needs to contain high iron content, and the iron content determines the elongation of aluminum casting. High iron content leads to low elongation of aluminum casting, which is also known as brittle and poor impact resistance. Therefore, aluminum alloy castings with high strength, high safety and impact resistance cannot be produced by aluminum alloy die casting process Of..

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(4) Specification of grounding wire: according to the regulations issued by the Ministry, the grounding wire must be made of bare copper wire of more than 25mm2. (5) it is mainly used for non horizontal charged movement and high, medium and low voltage circuit breakers and machine tools as cables, hardware and power supporting components..
Tzx-16 square square tin plated copper braided wire perforated tinned copper jumper wire (2) high voltage grounding wire structure: the portable high-voltage grounding wire consists of insulating operating rod, conductor clip, short line, grounding wire, grounding terminal, bus clamp, grounding clamp. Tzx-16 square square square tin plated copper braided wire perforated tin plated copper jumper wire (3) high voltage grounding wire manufacturing process: excellent production process - conductor clamp and grounding clamp are of high quality Aluminum alloy die-casting forming; operating rod using epoxy resin color tube, good insulation performance, high strength, light weight, bright color, smooth appearance; grounding soft copper wire is made of multiple strands of high-quality soft copper wire, and covered with soft, high-temperature transparent insulation layer, which can prevent the wear of grounding copper wire in use, and the copper wire can meet the fatigue test requirements, so as to ensure that the operators can meet the requirements of fatigue test Safety in operation. (4) Specification of grounding wire: according to the regulations issued by the Ministry, the grounding wire must be made of bare copper wire of more than 25mm2. Tzx-16 square square square tin plated copper braided wire drilling tinned copper jumper wire (5) is mainly used in non horizontal direction of live motion and high, medium and low voltage circuit breakers and machine tools as cable, hardware, power components. If you need customized or other specifications and models of copper braided mesh need to be ordered in advance, welcome to contact us!.
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1、 Fracture failure under the effect of injection pressure, the most vulnerable part of the mold crack initiation, especially the trace of molding line or the surface of machining trace is not completed, or the corner clearing place will be a small crack. The existence of brittle phase or coarse grain in the grain boundary is easy to fracture. The rapid crack growth, brittle fracture and the alarming cause of die fracture failure 。 Therefore, on the one hand, in the mold surface scratches, electrical machining traces need to be polished, even if it is in the gating system, also need lighting. It also requires high strength, advanced materials, good plasticity, good impact toughness and fracture toughness. Second, corrosion failure commonly used mold and zinc alloy, casting alloy, aluminum alloy, magnesium alloy and copper alloy, there are pure aluminum alloy die casting, zinc metal element, aluminum, magnesium is a kind of lively, they have a good affinity, mold material, is very aluminum sheet. When the mold hardness is high, it plays a very good corrosion resistance. If there are soft spots on the molding surface, it is anti-corrosion. 3、 In the production of die casting die with thermal fatigue crack damage failure, the surface chilling effect and its internal deformation of hot forming again and again appear with each other, causing structural damage and elastic loss, resulting in the appearance of microcracks, and continue to expand. When crack propagation, fluid diapir and molten metal, and repeated mechanical stress accelerate the crack growth. Therefore, on the one hand, the die casting mold needs to be fully preheated and started. In addition, in the process of die-casting die, it is necessary to maintain a certain working temperature range to avoid early cracking failure. At the same time, to ensure that the mold before production and internal production is not a problem. Because in actual production, die failure is the most thermal fatigue crack failure.