Motor steel plate casing shaping technology Beijing Electronics Industry School 17, Liu Yongping Lin steel plate production technology is concerned with the manufacture of the casing, including the detailed connection and replacement of the winding of the casing to compensate for the casing in the winding and welding process The lack of self-existence greatly affects the comparison of the three process methods of the motor matching department, the plastic tire method and the Jin method. The tire inflation method should be the most reasonable plastic effect. The steel shell motor in recent years The motor with rapid development outside has the advantages of good ventilation and cooling performance and light weight. Moreover, it has the advantages of high production efficiency, no pollution, less cutting, saving raw materials, and versatile use of the machine requires fast strain speed.
The key technology of the plate motor is the interference fit between the assembly of the steel plate casing and the stator core. The stator core is pressed into the casing by cold pressing. Therefore, the forming of the steel plate casing is the key technology for manufacturing the low-power steel plate motor. The main method of the steel plate casing. The manufacturing process of the steel plate casing 1. The cutting of the casing. Use punching blanking or precision shearing machine to cut the steel plate to the required size.
2The casing is round. A double-roller or roll-rounding machine is used to roll the sheet into shape, or a welcome pressure is used to press the sheet into a pole. The double-roller-rounding machine is composed of the next main driven roller and the sheet passes between the upper and lower rolls. , Roll-to-roll rolls the steel plate into a cylinder, the casing can be welded to the base wood forming casing, and the welding method after the steel casing is formed is generally arc boring. (3) Gas protection like arc welding and rolling resistance. , Production efficiency island, welding quality is guaranteed, the welding seam leveling machine shell shaping uses core tire extrusion or tire inflation radial expansion method to make the machine shell expand radially. The expansion force should stretch the steel plate beyond its deformation yield point, and cause the plastic permanent deformation of the casing to ensure the size of the casing.
Shaping process Shaping process is the key technology to ensure the accuracy of the inner diameter size and position of the chassis, which is directly related to the press-fitting of the iron core and the chassis, the processing of the end faces of the chassis, and ultimately affects the assembly quality of the motor. According to the design requirements, the chassis The average inner diameter tolerance is 001. The sheet is rolled into a cylinder on a rounding machine, but the radius of curvature of the joint area of ​​the cylinder is too large. The size of the straight line segment is related to the elastic modulus of the material. After welding, the tube weld Approximately two deer line segments intersect, and the shape is peach-shaped. If the casing is not shaped, the stator core is used as the positioning reference. When machining the casing stop, the two sides of the weld will meet. The length of 1020, 1 cannot be processed. = Some parts of the casing can not be processed 30 or even longer, which greatly affects the quality of the motor after assembly. After the cylinder is formed, the radial error is large, which directly affects the interference between the casing and the stator core. The interference is too large. The stator core is difficult to press into the casing, and the casing pressure pier changes. ; The over-weight view is too small, and the fixed iron core is loosely matched with the chassis.
Mi uses the core tire extrusion method to make the machine into the hall for shaping. It is a bit of a benefit to use this method for shaping. You can use existing equipment for shaping.
The casing material is 08 and the thickness is generally 2. When the casing is shaped, the core tire squeezes the casing, and the casing expands radially. According to the analysis of the internal pressure of the thin-walled cylinder in material mechanics, when the cylinder wall is subjected to the internal pressure, Its longitudinal section will withstand the hoop stress and the radial expansion force will stretch the steel plate beyond its deformation yield point, causing plastic deformation of the casing.
According to experience and calculation formula, the design of the inner diameter of the 80 motor shell is designed, the expansion size of 135 is 1.27, the cutting size in the circumferential direction is 425.5. After shaping, the size of the shell does not meet the design requirements. The material is not plastically deformed, only elastically deformed, so it has not been reshaped, but the inner diameter of the casing has a smaller roundness value. It is because after repeated experiments, the plastic expansion expansion is 1.6. The effect is better, Shank's inner diameter size is about 35, and the peach tip shape at the weld is corrected. The amount of plastic goods obtained by our experiments is 1.6, which is larger than the expansion snoring obtained by foreign manufacturers. 27 1 large, the reason is that the forming error of the casing is too bad or the elastic recovery of the material is different When the pressure is passed through the casing, the compressive force of the casing is qualitatively analyzed from the force state of the casing. The household can be decomposed into radial force 2 and axial force 3 by the user 1, which is necessary to increase the inner diameter of the housing. The expansion force will cause the wall of the cabinet to collapse, which is a harmful effect. Especially for the cabinet with ventilation holes, the role of the nano can deform the ventilation holes. The use of core tire extrusion jade shaping has the effect that it is inevitable that the larger the expansion scene, the larger the cone angle, and the larger the core tire extrusion shaping method is not suitable for thin-walled cylinder shaping.
When the casing is under stress, the expansion tire adopts 8 fan-shaped expansion flaps, the inner hole is a cone hole, 2 is small, and 3 applies force to the conical jade core, the surface of the cone pressure core squeezes the inner hole cone of the inflation tire and , Expansion flap expands and extrudes the casing. Thus, the guide cone surface of the core tire guide cone casing core tire is implemented.
However, the peach-shaped shape at the welding seam of the casing can also use a simple shaping tire to press the shaping seam of the casing welding seam. The shaping tire is composed of upper, middle and lower parts, and the pressing surface is an arc surface that matches the curvature of the casing. 3 The casing is placed on the middle tire, and the welding seam is located at the highest point of the middle tire. Pressure is applied to the upper tire to make the upper, middle and lower tires compact the casing. After the compression, the peach-shaped phenomenon of the casing is improved. When the chassis is processed with a stop, the loudspeaker 15 minutes can be rounded. However, there is still the phenomenon that the stop is not completely added by 1 and the core tire extrusion method produces harmful forces, so that the deformation and compaction method of the casing wall cannot improve the dimensional accuracy of the inner diameter of the casing. The method of plastic deformation of the tire casing to make the casing plastically deformed can solve the various motors proposed. How, to a large extent, depends on the low manufacturing process water, so the shaping of the private board casing must be perfect. In order to make the quality of the steel shell motor constant, 1. Edited by Jiang Zhixiang. Material mechanics. Tsinghua University Press, 1980 to the uniform radial expansion force required for shaping without axial force. By 2. Motor technology. Shanghai Electric Appliance Research Institute. In 1987 and May, it was relatively complicated to make a flat tire. 1 still needs some questions about the support of the supporting force device editor Lu Delong and 1 Yi 1, so that this kind of plastic shaping process failed.
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