Therefore, cleaning the surface of copper castings and strengthening the appropriate process steps are the key to solving the silver plating quality of copper castings. Because the metal structure of copper castings is loose and porous, attention should be paid to the cleaning of each process during the electroplating process to prevent the solution remaining in the hole from affecting the next process; during electroplating, the impulse current density is about 3 times higher than that of ordinary parts, and the pre-plating time is longer than ordinary parts.

The high-precision copper strip used for the special-shaped frame of the cast copper transistor is generally made of a high-strength, high-conductivity alloy containing phosphorus and silver, and its section is composed of thick and thin sides. The blanks with special-shaped cross-sections are produced through pass rolling, chip milling, and high-speed forging, and then high-precision rolling is carried out to ensure that the elongation coefficients of the thick edges and thin joints are equal, otherwise the shape of the special-shaped strip cannot meet the needs of users.

The microstructure of copper castings is looser than that of rolled and rolled copper, and the appearance is rough and porous. To avoid or reduce defects such as component segregation, deformation and cracking of copper castings. When designing copper castings, not only must the geometric shape and size be determined according to the working conditions and the properties of the metal material, but also the rationality of the design must be considered from the perspective of the casting alloy and the characteristics of the casting Casting Automotive Mould Manufacturers process, that is, the obvious size effect and the problems of solidification, shrinkage, stress, etc.

When precasting, the parts and hanging tools should be shaken frequently to ensure the uniform color of the coating and prevent the appearance of spots during silver plating, which will affect the appearance of the coating; under the premise of shaking the workpiece, electroplating with pulse current density for 5 minutes, and then change to normal current density . In addition, some molding sand, paraffin and silicate substances often remain on the surface of copper castings, which often leads to local electroplating

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Frequently driving in a congested city is expensive.No. Generally, the replacement mileage of conventional brake pads is about 25,000-30,000 kilometers per driving.6 mm below the life line. Generally, the vehicle runs to 60,000~ It should be replaced at 100,000 kilometers, and the specific replacement cycle should be based on the vehicle's maintenance manual.

On a vehicle that has been driving on the highway for a long time, it can be replaced once after 30 thousand kilometers or even longer. If the discharge time displayed on the dashboard is suddenly prolonged, it is time to replace the battery. The timing belts and accessories should be replaced regularly within a specified period. Even if you have a timing belt in your car, once it breaks, you cannot replace it yourself.

In the following situations, you must pay attention to replacing the battery: The important indicator is to see if your wiper is dry or not, are there any scratches during use? The car wiper has been exposed to long periods of sunlight and rain, and it has been aging, which has caused the wiper to be unclean. Second, tires Replacement cycle: 50,000*80,000 kilometers To replace tires regularly, no matter how durable a set of tires is, they cannot be used for a lifetime. Eighth, air filter Replacement cycle: 10,000 kilometers

The replacement cycle of different cars is naturally different, so there is no absolute standard, because it depends on Casting Auto Mould the amount of dust and impurities absorbed by the air filter..6 mm, or the tread has reached the wear indicator mark, it must be replaced. Generally speaking, the service life of the resistance spark plug is 20,000 kilometers, the life of the Burkin spark plug is 40,000 kilometers, and the life of the iridium spark plug can reach 6*80,000 kilometers. Fifth, shock absorber Replacement cycle: no fixed time For all engines equipped with timing belts, manufacturers will have strict requirements.

It is also an air filter. When the headlights are not bright enough in the low-speed state, this time is actually reminding us that it is time to replace the battery. Auto parts For car tire replacement or scrapping, please refer to the following points: 1. Therefore, when the total travel distance reaches 80,000, it is recommended to consider replacing it. Tires with punctured shoulders. According to the quality of the wiper, the use environment, and the degree of maintenance, the replacement time of the wiper is different. 2. It may be replaced within two months

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