The design and manufacture of cross wedge rolling die is the key to realize the cross wedge rolling process. At present, the cross-rolling die basically realizes the parametric design, but the manufacturing is still in the stage of CNC turning machining by manual turning or manual programming. Production practice proves that the current turning-based processing method requires large-scale processing equipment, which not only has huge investment, but also has low processing efficiency and difficult machining accuracy. Therefore, it is necessary to further study the processing method of the wedge cross rolling die, thereby improving the design and manufacturing level of the cross wedge rolling die and realizing the CAD/CAM integrated system. In addition, since the current roll wedge cross-rolling die has a circular arc shape, it is easy to deform by heat treatment, and it is not easy to process after deformation because the machining changes the reference arc radius. Therefore, the conventional roll wedge rolling die is generally not suitable for quenching heat treatment, and the performance (hardness, rigidity, wear resistance, etc.) of the die is not improved, which seriously affects the service life of the die. At present, CNC milling has been widely used in the mold industry, especially the high-speed milling processing technology has matured, bringing a thriving atmosphere to mold manufacturers. Therefore, in order to overcome the shortcomings of the current cross-rolling die production, improve the mold performance and service life, and to produce high-quality and high-performance wedge cross-rolling die, this paper studies the milling method based on the flat-bottom wedge cross-rolling die. 2 flat bottom block wedge cross rolling die structure flat bottom block mold structure as shown. The so-called flat bottom means that the bottom surface of the arc of the mold is curved to be straight, and the curved surface which is easily deformed and difficult to be positioned becomes a stable plane. The so-called block type refers to dividing the mold into several small pieces, and the volume is changed from large to small, so that the hole type is distributed on each mold block for separate processing. Under the premise of not affecting the mold performance and forming the part, while the mold is changed from the circular bottom structure to the flat bottom structure, in order to reduce the mold weight and the processing area, the mold base widening portion can be appropriately reduced in size. The mold 3D solid model and mold block are as shown. The current arc bottom structure mold processing is to assemble the divided pieces of blanks and then install them on the mandrel for overall turning. The flat-bottomed block mold is suitable for single-piece milling, and the blank can be selected from castings or forgings of the two structures shown. Therefore, the small-sized machine tool can be used to complete the block processing of the large-sized mold, thereby greatly reducing the investment in processing equipment. In addition, the mold of this structure facilitates the use of a heat treatment process, and it can be easily corrected by milling processing even if a small portion of the deformation is caused by the heat treatment. The rapid rotation of the spindle and the rapid feed of the tool enable flexible and efficient machining of various complex mold holes and base sides. Shown is a machined mold () mounted on a roll formed on a regular polygonal mandrel. 3 Graphic-based image automation programming technology CNC machine tools are high-efficiency automation equipment that automatically processes workpieces according to programmed machining procedures. The quality of NC program is an important factor affecting the quality and efficiency of CNC machine tools. For simple parts with less complex geometries, the calculation is simple and the number of machining programs is small. It is easier to implement by manual programming, but for the wedge cross-rolling die block with complex hole type and data inter-joining between mold blocks, manual programming It takes a lot of time and is hard to do. Graphic-based image automatic programming techniques emerged in the late 1980s and many excellent CAD/CAM software systems emerged. The 3D model designed by the CAD system can be directly programmed in the CAM system. The programmer only needs to specify the machining part and the reference surface according to the specific shape of the part, select a reasonable machining type, set the necessary process parameters, the system will automatically calculate and display the tool machining path, simulate the machining state, check the path of the tool, etc. If there is an error, it can be corrected immediately. Automatic programming greatly reduces the probability of programming errors and improves programming efficiency and reliability. In order to realize the automatic programming of the cross-rolling die based on graphics, it is necessary to first obtain the three-dimensional model of the flat-bottom wedge cross-rolling die. Through the secondary development of Pro/E, the parametric design of the cross-rolling die has been basically realized. Store the model in IGES, DXF or STL format, then import the mold 3D graphics from the Mastercam system with powerful automatic programming and simulation processing for automatic programming. Mastercam can easily program 2D ​​and 3D toolpaths, generate 2- to 5-axis, and CNC machining code that can be recognized by various CNC controllers. 4 mold CNC milling and process planning mold blocks are distributed in a circular groove shape, after research found that the use of Mastercam four-axis rotary machining can produce high precision, good surface quality mold. When machining the circular groove type, the tool not only needs to move in the X, Y and Z directions, but also the tool spindle rotates in the direction perpendicular to the axis of the mold to form a precise groove shape. The side of the mold, the hole type and the mounting hole are machined on a CNC machine tool, eliminating the overhead of the cutting machine, the drilling machine and its auxiliary equipment, and shortening the mold development cycle. In actual machining, according to the technical requirements of the parts, a reasonable processing procedure is established based on the principles of tool concentration, first coarse and fine, and reduced workpiece loading. Under the premise of ensuring the requirements of surface precision and surface roughness, the process parameters are reasonably set according to the performance of CNC machine tools, tool materials, mold models, and die hole sizes. The mold processing steps are as shown, and the process parameters are as shown. 5 Simulation processing, post-processing, NC machining NC code generation The machining process is established. After setting the process parameters, the setting results are submitted to the CAM system for tool path calculation. In order to ensure the safety of the program, the generated tool path must be inspected and checked to check whether there is an obvious tool path, whether there is overcutting, and the machining is not in place. At the same time, it is checked whether interference with the workpiece and the fixture occurs. The specific verification methods include direct inspection, manual inspection, and physical simulation processing. The astercam machining simulation function interactively simulates the process by which material is removed from the CNC toolpath data to verify the machining operation. The entire machining process of the mold is very similar to the actual machining of the machine. The side of the mold block is being simulated. Post-processing is actually a text editing process that converts the calculated toolpath (tool path motion trajectory) into NC code in a defined standard format. After generating the NC code, you also need to check the code file and modify the file according to the actual requirements. The modified file is transferred to the CNC machine controller via the Communic command to drive the machine. 6 Conclusion The flat-bottomed wedge cross-rolling mold proposed in this paper is suitable for block CNC milling (even high-speed milling) processing, which is convenient for quenching treatment, which can improve mold processing efficiency and service life. Through the automatic programming software simulation, the wedge cross rolling die was machined, and the NC code available for actual machining was obtained, which verified the feasibility of the cross wedge rolling. (Finish)
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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