Publish Time: 2023-02-09 Origin: Site
Aluminum motor housing is generally cast iron (pig iron) casting, you can use the angle grinder in the crack grinding V bevel, and then welded with cast iron welding rod. This can only be an emergency, in the long run, it is better to replace the housing, so as to avoid the motor in operation, the occurrence of "rolling package" (housing and stator wire package, the position of movement, the motor wire package lead wire yanked off), resulting in motor damage and scrap.
Among the materials used in the production of motor housings. What is the difference between aluminium and cast iron?
What are the advantages of using aluminium for the motor housing?
What is the production process of the motor housing?
Different chemical properties
1, cast iron: cast iron contains 2.5% to 3.5% carbon. Carbon is mostly present in cast iron in the form of graphite, and sometimes in the form of carburized bodies. In addition to carbon, cast iron also contains 1% to 3% of silicon, as well as manganese, phosphorus, sulphur and other elements.
2, aluminum: easily soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solution, insoluble in water. Relative density 2.70. Melting point 660℃. Boiling point 2327℃.
Different characteristics
1, cast iron: due to the uneven wall thickness of the casting, in the heating, cooling and phase change process, there will be effect force and tissue stress. In addition, large parts are also prone to internal residual stress after machining, all these internal stresses must be eliminated.
2, aluminium: is an active metal, in dry air aluminium surface immediately formed about 50Å thick (1Å = 0.1nm) dense oxide film, so that aluminium will not be further oxidation and can be resistant to water; but the powder and air aluminium
The motor housing is cast in grey cast iron for the larger ones and in aluminium alloy for the few smaller ones. The seemingly large block of metal inside is not actually a single unit, it is made of sheets of silicon steel laminated together in order to obtain good magnetic conductivity and to minimise eddy current effects.
There are several considerations for the use of aluminium housings for small motors.
1. Aluminium is less dense and can reduce the weight of the whole machine.
2. The thermal conductivity of aluminium is better than that of iron, which facilitates the heat dissipation of the motor.
3. The low strength of aluminium makes it easy to process and manufacture, saving processing costs.
The casting process of the micro motor housing is mainly based on advanced technology, which is conducive to improving the casting level of the motor housing. In terms of design and practical skills, it is necessary to do three processes of pre-processing, central processing and post-processing. First, a solid model is established according to the shape of the actual object, and the preliminary work of the casting is completed through numerical simulation, polyhedral element subdivision and three-dimensional simulation calculation skills.
Secondly, the micro-motor housing uses the numerical simulation method to analyze and judge the heat balance equation and shrinkage cavity, and complete the center machining work. Use colorful graphs or drawings to dissect the dynamic performance of computer results. In the casting process of the motor housing, attention should be paid to the casting position, bisector, riser, cold iron and other processes. The bottom pouring system can be selected, which is conducive to mold exhaust and scum floating.
The micro motor housing should pay attention to the effective use of the smelting process. The principle of selecting chemical raw materials is: avoid shrinkage caused by the lack of graphitization expansion and avoid graphite floating phenomenon; in the smelting process, according to the limited feed equilibrium condensation theory, in order to reduce the liquid shrinkage, the low temperature casting method is selected. In conclusion, the temperature distribution of the casting is represented by a two-dimensional equation, a dynamic stress field or a three-dimensional stress field.
Guangdong Fenghua Zhuoli Technology Co., Ltd, which has been established for over ten years, focuses on the production of motor housings. Here, you can find the motor housings you need.