Structural principle and stress state of high frequency machine

Sheet profiles with low lengths of high frequency machines, as well as channel section parts, are traditionally manufactured in one or two stampings in a dedicated mold. It is also possible to stamp unit by universal tool, but the flat section 3 should be wide enough when using this method. When manufacturing the punch and die of a special mold, it should be entered from the nominal thickness of the material. Departure and work with the work surface. In the closed position, the mold should correct the flat section of the part and eliminate the effects of free bending of the blank. The actual value of the blank thickness may be entered. The values ​​vary widely, so not all segments are being corrected. Uneven correction will be negatively reflected in the accuracy of the part, which is one of the shortcomings of the traditional process. The disadvantages of conventional processes are the expense of molds and equipment because the peak load characteristics of the press produce too much power.

The pressure value of the edge of the mold on the blank of the high frequency machine. The tensile resistance of the blank on the curved section is significantly weak. The opposite effect is due to the hardening of the segments caused by the bending, which occurs faster than the hardening of the planar segments. In determining the minimum allowable fillet radius Rmin of the punch and the die, it should be based on the condition that the blank section which is not in contact with the mould is transferred to the plastically stretched state before the load carrying capacity of the blank section subjected to the contact pressure disappears. The obtained value Rmin is nearly 50% larger than that when it is generally bent. For low carbon steel, the Rmin value does not exceed the thickness value of the material. The limit angle of the inclined wall is nearly 45° when the test specimen is tested, which can be confirmed by the results of the test stamping profile.

When measuring the straightness of the diagonal section of the part, it was found that there was a deviation, but it did not exceed the thickness tolerance of the blank material. At this time, the tensile deformation of the bus bar is in the range of 10%, and the stretched section extends along the width, that is, less than 2 mm in the longitudinal direction of the profile.
During the bending process, the edge of the blank moves toward the punch, preferably these movements are carried out together with the concave module, otherwise the blank segments will slide along the edge of the die and undergo bending and subsequent straightening, causing excessive deformation of the blank segments. thin. A mold structure with a movable concave module was developed which was mounted on a press having a high power damper for clamping the edges of the blank.

The working process of the mold is as follows: the blank is placed on the punch and the pressure plate. The pressure plate is installed in the guide groove of the movable plate. When the upper die plate descends, the female module mounted in its guide groove presses the edge of the blank against the pressure plate and moves with the slider stroke of the press, thereby overcoming the back pressure of the bumper ram. The blank is bent around the edge of the mold, causing a pulling force in the blank and moving the concave module and the pressure plate perpendicular to the stroke of the press slider. When the bending angle of the blank reaches the desired value, the platen and the wedge begin to interact. The planes they contact are also equal to the angle of inclination, so that the further direction of the platen movement is along the wall of the curved part. The edge of the blank clamped by the friction between the concave module and the pressure plate moves together with the pressure plate.

When the press slide is reversed, the finished part moves up with the female module and the pressure plate. The platen stops at the level of the punch and the concave module continues to move with the upper template. The anti-wedge mounted on the upper plate interacts with the journal of the platen and retracts the platen and the female module associated with its pin to the stop limit.

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