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2 Radial series sectioning method and determination of the internal stress field of the model The photoelastic model of the toothed concave mold studied can be seen from the structure, and the whole concave mold is cyclically symmetrically distributed in the unit of gear teeth. Fully consider the possible stress concentration phenomenon in the transition zone of the inner wall edge of the die, and at the same time facilitate the measurement of the photoelastic data and the stress separation. A radial series tiling scheme determined in the paper, that is, the radial cutting of the half tooth Piece, then analyze and calculate the full field stress and inner boundary stress distribution of the toothed die.
Slice one: the top slice. Slice 2: The midline of the tooth profile near the index circle. Slice three: root section.
According to the structural characteristics of the toothed die, and for the convenience of research, the cylindrical coordinate system (, r, z) is used to describe the separation of the stress state and the principal stress of the die after being loaded and frozen, and the treatment of a certain slice. It is described by a Cartesian coordinate system (x, y, z). A slice is taken from a three-dimensional frozen model, and one ortho- and two oblique shots of the slice can obtain three normal stress differences and three shear stress components of the measured point, and add another balance equation. Conditions can achieve separation of six stresses. This method can be used to measure the results of three slices in three models for one slice measurement of a model. If the image processing is further used to achieve the refinement of the equi-wafer line and the equi-tilt line, a satisfactory experimental precision can be obtained, and the error caused by the oblique shot can be reduced.
3 Photoelastic image and experimental data results analysis To calculate the full field stress of the toothed concave mold, it is necessary to process a large number of photoelastic stress isobaric lines and isometric images; for this, the computer system is used to equidistant lines and The isoline is used for image processing to improve the experimental precision and experimental automation level of mold strength research. It can be seen from the figure that when the blank is filled, the inner wall is pressed against each other, and the stress is greatest at the top of the tooth; the intermediate transition portion of the top and the root is also stressed, which is caused by the interaction of the blank with the inner wall at the beginning of forming; The stress at the root is small.
Discussion on Modeling Gears by Three-Dimensional Method
1 Photoelastic Stress Freeze Test of Gear Die The blank used in this experiment is made of plexiglass. Plexiglass has good plasticity and low deformation resistance around 160, which can simulate the pressure exerted on the cavity by the part during the precision forging process. The test device is shown in Figure 5. During the test, the plexiglass blank was placed in a drying oven and heated to 160. The die and related equipment were directly placed in the furnace cavity of the electric drawing machine with heating device, heated to 120, and then the hot billet was quickly moved into the electric pull. The test device of the machine is press-formed, and finally the pressure curve is loaded and unloaded as shown.