The die design of the stator and rotor of the small and medium-sized motor is based on the dimensional tolerances given in the product drawing. The size of the workpiece after punching should meet the requirements of the product design drawings. The actual dimension of the punching die is through the dimensional tolerance of the punch and die of the die. Realized. Now we have a brief introduction on the experience of the stator and rotor punching die design practice, as well as the relevant information on the manufacturing tolerances of male and female die manufacturing.
When designing a punching die, the punching die is generally smaller than the die, and there is a certain gap between the cross section of the punch die cutting edge and the cross section of the die cutting edge, that is, the gap (A) of the die, which is a gap on both sides. Sum.
As we all know, the punching process includes four stages of elastic deformation, plastic deformation, shearing and separation. The reasonable die clearance should be that when the sheet breaks, the cracks generated on the cutting edge of the punch and die are basically in a straight line, otherwise the workpiece edge will produce impermissible burrs. This reasonable gap has a certain range of variation. It is related to the hardness and thickness of the material. For a silicon steel plate with a thickness of 0.5 mm, the gap between the male and female die is 10% to 14% of the plate thickness, which is 0.050 to 0.070 mm. In the die design, we usually indicate “0.050 to the double-sided gap†in the technical requirements. 0.070mm and convex (concave) mold with "words." The reasonableness of the clearance value relates to the quality of the workpiece and the service life of the die.
3 Method of manufacturing manufacturing tolerances for male and female dies In the product drawing, the nominal dimensions of the stator dies and the upper and lower deviations are given. When designing the die, the nominal dimensions of the punch and die are the same as those of the workpiece. The outside diameter of the lamination core of the stator laminations is required to be matched with the machine base, and the holes of the rotor lamination punch core are matched with the rotation axis, but what kind of cooperation is adopted to the tolerance level Decide and meet product design requirements.
In practical applications, the manufacturing tolerances of the male and female molds are only within a relatively small tolerance band, so it should be observed that: when punching, the punch size is determined by the maximum limit size of the hole; when blanking, the size of the female mold is according to the workpiece The principle of determining the minimum limit size. Considering that the wear caused by the die during operation will increase the clearance, the manufacturing tolerances of the male and female molds are determined according to the tolerance of the workpiece size, that is, the manufacturing tolerance accuracy of the male and female molds is one step higher than that of the workpiece tolerances.
Generally, when designing the die, the tolerance values ​​are based on the requirements of the product drawing, and the internal diameter of the stator stator of the die working part is calculated according to the relevant formula: according to the tolerance of the punching part 0.089, the size of the stator groove punch is calculated as inch tolerance. We applied this method in practice and found that there are many disadvantages. First, the accuracy is low, and it is difficult to guarantee the product drawing requirements. Second, the calculation is cumbersome and the design process takes a long time. So we improved it and adopted a design method in which the manufacturing tolerances of convex and concave molds are taken as 2/3 of the deviations on the corresponding workpiece. This method is based on the concept of improving the die design tolerance by 12 levels. It is not ideal to increase the precision by one level. It is difficult to increase the level by two in manufacturing, and the cost is relatively high. It is reasonable to adopt 2/basically to increase the level by 12. That is, the lower deviation of the die during blanking is the same as the lower deviation of the workpiece. The upper deviation of the die takes 2/3 of the deviation on the workpiece; the upper deviation of the punch when punching is the same as the upper deviation of the workpiece, due to the stator and rotor of the motor. The holes are all made of base holes, so the deviation of the deviation of 2/3 on the workpiece is taken as the punch.
This method does not require formulas and look-up table calculations, and basically guarantees the accuracy requirements of the workpiece. Now compare it with the calculation methods provided by the data.
The punching die size calculation formula is as follows (where S is the die manufacturing tolerances) blanking die size calculation formula is as follows: When the die convex and concave die with the processing, the silicon steel die die manufacturing tolerances are shown in Table 1. Table 1 mold manufacturing Tolerance mm Product Tolerance A Manufacturing Tolerance S Product Tolerance Δ Manufacturing Tolerance S 4 Manufacturing Example of Manufacturing Tolerance of Male and Female Dies Take Y2-315 stator and rotor stamping as an example. They are described as follows: 4.1 Example 1: Fixed rotor ring), shaft hole 10H8d0 .54) The process is one of three.
(1) Calculate the outer diameter of the stator and the stator stator according to the formula: According to the tolerance of the blanking part A=0.15-0.08=0.07, when the product tolerance is 0.07, the manufacturing tolerance of the inspection table is 0.027, the upper deviation is 0.08+0.027= 0.107, so the die tolerance is 0.090, product tolerance is 0. 090, the look-up table has a manufacturing tolerance of 0.035, the lower deviation of 0.089-0.035 = 0.054, so the punch tolerance is a modular configuration.
055, when the product tolerance is 0.055, look-up table manufacturing tolerance is 0.022, the lower deviation is 0.054-0.022=0.032, so the punch tolerance is 0500.070mm and the punch is equipped with clearance.
The outer diameter of the stator punching plate: the deviation of the die is 0.15X2/3=0.10, the die size tolerance is 20 2/=0.059, and the die size tolerance is 50 on the 0:089. 0500.070mm two-way gap preparation.
Die size tolerance is h0t0:054. 0500.070mm.
When designing the punching and recessing die, the dimensions of the punches of the stator and rotor slot, dovetail slot, key hole and rotor vent hole are all marked with tolerances. The corresponding requirements for the die pattern are marked as “Two-way clearanceâ€. 0.0500.070mm can be prepared with punch.
Stator stator slot shape, slot size shown in Table 2.
Table 1 stator slot size mm code size (2) calculated with 2/3 method punch die rotor slot shape, see the slot size shown in Table 3.
Table 3 Rotor slot size mm code B1B rotor slot shape () According to the formula, the groove punch size is as follows: L=53.6+). 8Qmm Other size comparison calculation is omitted.
5 Conclusion In summary, in the die design, the dimensional tolerances can be calculated according to the formula, but also by 2/3 method value. However, from the above values ​​and practical application verification, using the 2/value method not only can improve the precision of die design, but also the value of the dimensional tolerance in the die design is convenient and quick, and can fully meet the product design requirements. It is a die design. A well-established method for taking tolerance values ​​during the process.
120+0080mm(2) Calculate punch size by 2/
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