During the cold extrusion forming of the inner ring gear tooth shape, the billet metal expands outward. When the upper punch leaves the blank, the metal is reset to the original position. This is the rebound of the metal, which is reflected in the cold extrusion. The size of the tooth tip circle and the root circle of the ring gear is smaller than the size of the punch on the die, so the tooth shape and size are increased, so that the wire cutting according to the size of the standard tooth shape cannot meet the requirement, and must be The tooth profile and size are corrected. The amount of shrinkage is related to the mechanical properties of the material, the size of the cold extrusion, the size of the extrusion force, etc., and can be calculated according to the elastoplastic theory. Since the assumptions of the calculation formula differ greatly from the actual one, the correction value The actual distance is large, and it is generally determined based on experience and corrected. The latter is determined by the die size of the inner ring gear.
The inner ring core structure has a blind spot in the processing of small modulus gears in China. Therefore, the shape of the tooth profile curve of the ring gear is designed by computer aided design. Then, according to the size of the inner ring gear teeth, the tooth profile curve on a single circumference is drawn. Finally, the coordinates of the feature points on the curve and the curvature radius and center coordinate value of the relevant arc are used to form the tooth profile of the inner ring gear. Line cutting program for punching blocks. Through computer-aided design, we have solved the problem of processing the main part and the upper punch in the core structure. Using computer-aided design, after designing the size of the tooth profile, the coordinates of the feature points on the tooth profile curve of a single segment and the radius of curvature and center coordinate of the associated arc.
Classification of tablet press: Models can be divided into single punch tablet press, rotary tablet press, sub-high speed rotary tablet press, automatic high speed tablet press and rotary core tablet press.
The sheet shape pressed by the tablet press is initially flat circular, and later developed into shallow circular arc and deep circular arc on both sides, which is for the need of coating. With the development of special-shaped tablet press, oval, triangle, oblong, square, diamond, circular ring tablets followed. In addition, with the continuous development of preparations, due to the requirements of compound preparations and timed release preparations, special tablets such as double layer, triple layer and core coating are made, which need to be completed on special tablet press.
Rotary tablet press is a machine which is made of several pairs of die distributed on the turntable to make a circular lifting movement according to a certain track and press the granular material into tablet through the press wheel. And the stamping rod with the rotary table rotating speed ≥60m/min line press is called high-speed rotary tablet press, this high-speed rotary tablet press has a forced feeding mechanism, the machine is controlled by PLC, has the automatic adjustment of pressure, control the weight of the piece, eliminate the waste piece, print data, display fault shutdown and other functions, in addition to the control of the weight difference within a certain range, Quality problems such as missing Angle and loose lobe can be automatically identified and eliminated.
With the development of market demand, the scope of application of tablet press is more and more wide, no longer simply limited to the suppression of Chinese and Western medicine tablets, more widely suppressed health food, veterinary medicine tablets, chemical tablets: such as mothballs, washing blocks, smurf blocks, art powder, pesticide tablets, food tablets: chicken essence block, isatis root block, divine Qu tea block, compressed biscuits.
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