The technology of shaping steel plate casings for motors is a critical aspect of motor manufacturing, particularly in the production of steel shell motors. This process involves not only the precise connection and replacement of windings but also compensates for defects that may occur during the winding and welding stages. These issues significantly impact the comparison between three main methods: motor matching, plastic tire, and Jin method. Among these, the tire inflation method is considered the most effective in achieving a uniform plastic effect.
In recent years, steel shell motors have seen rapid development, especially in external motor designs. They offer advantages such as good ventilation, efficient cooling, lightweight construction, high production efficiency, no pollution, reduced cutting, material savings, and versatile machine usage with fast strain speed.
One of the key technologies in steel plate motor manufacturing is the interference fit between the steel casing and the stator core. The stator core is typically pressed into the casing using cold pressing, making the forming of the steel casing a crucial step in producing low-power steel plate motors. The manufacturing process includes cutting the casing using punching or precision shearing machines, followed by rolling the sheet into a cylindrical shape using double-roller or roll-rounding machines, or pressing it into a pole shape with a press.
After forming, the casing is welded, usually through arc boring or gas protection welding techniques, which ensure high production efficiency and consistent weld quality. Once the steel casing is formed, it undergoes radial expansion using either core tire extrusion or tire inflation methods to achieve the desired dimensions. This expansion must stretch the steel beyond its yield point, causing permanent plastic deformation to ensure accurate sizing.
Shaping the casing is essential to guarantee the accuracy of the inner diameter and position, directly affecting the press-fitting of the stator core and the overall assembly quality of the motor. If the casing is not properly shaped, the stator core cannot be accurately positioned, leading to machining difficulties and poor motor performance.
Using the core tire extrusion method allows for efficient shaping without requiring new equipment. The casing material, typically 08 steel with a thickness of around 2 mm, is expanded radially under internal pressure. According to material mechanics, this pressure causes hoop stress and radial expansion, resulting in plastic deformation of the casing.
Through experimentation, it was found that an expansion of 1.6 provided better results than the 1.27 used by foreign manufacturers. This helped correct the peach-shaped distortion at the weld and improved the inner diameter size. However, excessive expansion can cause harmful effects, such as wall collapse or deformation of ventilation holes.
To address the peach-shaped issue at the weld, a simple shaping tire can be used. It consists of upper, middle, and lower parts with an arc-shaped pressing surface that matches the casing curvature. By compressing the casing, the uneven shape is corrected, improving the overall quality.
Despite these advancements, challenges remain, such as ensuring uniform radial expansion without axial forces and overcoming limitations in thin-walled cylinder shaping. Proper shaping is essential for maintaining the quality and consistency of steel shell motors. As noted in various studies, including "Material Mechanics" by Jiang Zhixiang (Tsinghua University Press, 1980) and "Motor Technology" by the Shanghai Electric Appliance Research Institute (1987), achieving this requires careful control of the shaping process.
Ultimately, the success of the plastic deformation process depends on the level of manufacturing expertise, making the shaping of steel plate casings a vital and complex task in motor production.
Wood Fired Pizza Oven
Wood-fired ovens come in various styles and sizes, ranging from portable outdoor ovens to large, built-in units found in restaurant kitchens. Despite advancements in technology, the fundamental principle of using burning wood to create even, high temperatures for baking remains consistent over the centuries.
Wood-fired ovens are specifically designed for cooking pizzas using wood as the primary heat source. The wood fire heats up the bricks inside the oven, providing the perfect cooking surface for the pizza.
These ovens typically use dried hardwoods like maple, oak, hickory, and walnut to generate optimal flames and smoke. These hardwoods burn cleanly and impart excellent flavors to the food.
Once the wood-fired oven reaches full temperature, pizzas are cooked at incredibly high temperatures, ranging from 750° to 850° Fahrenheit. This intense heat allows pizzas to cook in a rapid 2 to 3 minutes, resulting in a charred crust that adds to the flavor profile.
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