The relationship between the angular acceleration of the turntable and the angle of the indexing cam can be seen. When the cam rotates evenly, the turntable can be smoothly connected when the turntable is stopped and indexed, and the change is stable. This makes the processed contour smooth and smooth. In the numerical control machining, the above algorithm principles are utilized, and the tool motion is processed by simulating the motion law of the rotary table roller, so that a good cam machining precision can be obtained. It is easy to see that the exit segment and the inlet segment of the cam processed by this algorithm also conform to the overall motion law of the turntable, which avoids the phenomenon that the guide arc treatment is easy to generate interference and impact. During the machining process, the diameter of the milling cutter is the same as the nominal diameter of the indexing roller, and the milling cutter is a common end mill.

CNC machining and programming processing of cams Indexing cam NC machining is performed on a CNC machine with three translation axes (X, Y, Z axes of the machine coordinate system) plus a rotary axis. The indexing cam is fixed to the rotating shaft (such as the A-axis), and the indexing camshaft rotates evenly. The corresponding milling cutter simulates the rotary roller to intermittently shift the motion on the circular arc with the Oc as the center and the RC as the radius. The origin of the workpiece coordinate system is at the midpoint of the uppermost bus bar of the cam center. The z-axis is aligned with the axis of the milling cutter, the x-axis direction is to the left, and the y-axis direction is determined by the right-hand rule, which is consistent with the previously established coordinate system S={O; x, y, z}. The Z-axis of the machine coordinate system controls the machining depth, and the Z-axis coordinate remains unchanged during the cutting process. When the milling cutter is at the middle point M of the cam, the rotation angle of the camshaft at this time is H=0, and the indexing cam machining program is programmed by the sub-macro programming method. The main machining program only needs variable transfer and can be called at any time. The submacro program takes the camshaft rotation angle as an independent variable and its range of variation is -2P-H0/2 Through the above method, the machining program of the numerical control four coordinates of the indexing cam can be programmed. Processing test example This method was tested in the Huazhong CNC system Century Star HNC-21M four-axis linkage CNC milling machine. Its installation and CNC machining methods are shown. The selected test cam parameters are as follows: the number of rollers of the turntable is n=18; the radius of the center of the turntable roller to the axis of the shaft is 140mm, and the length of the axial direction of the cam is 90mm; once per index of the turntable, the indexing movement of the corresponding camshaft needs to be rotated. The angle is 100b; the distance from the center of the turntable to the axis of the camshaft is 140mm; the depth of the milling head is 12mm from the top of the cam; the cutter is a normal end mill with a diameter of 16mm. After processing, the test and test indicators Both are better than traditional methods. Firstly, the machining efficiency is high. The machining efficiency of the four-axis linkage milling machine is 115 times higher than that of the CNC milling machine with indexing, and the surface quality and finish are obviously improved. The machined index cam is installed for testing. The movement of the cam can be carried out according to the trigonometric function. There is no impact. The inlet and outlet sections are exactly the same as the middle-index right-angle cam machining programming algorithm. And the quality of the processed cam has been significantly improved. At present, this technology has been successfully applied in the design and processing of textile machinery indexing devices.

Cam Mounting and Numerical Control Machining Schematic Conclusion This paper presents a NC machining method and algorithm for right angle precision indexing cam. This algorithm enables the indexing movement of the turntable to be performed in a trigonometric relationship, and the angular acceleration changes continuously and smoothly without impact. The movement rules of the inlet section and the outlet section are exactly the same as those of the intermediate index section. The functional relationship between the cam angle and the tool motion is derived. In the NC machining, the tool movement completely simulates the movement law of the turret roller, so that the cam machining precision is obtained, and the high-precision NC machining of the cam is realized on the four-axis CNC machine tool.

(Finish)

Metal Gasket

Metal Gasket Products Features
Wide range of applicable working condition,high temperature and high pressure resistance,applicable to super low temperature and vacuum condition.Chemical resistant gasket is available under various medium,through change of composition of gasket.
Strong stress compensation,stable and reliable sealing performance even under frequent pressure fluctuation condition.
Perfect sealing performance.
Normal requirement of flange surface finishing which contact with gasket.
Easy installation and low pre-tightening stress of gasket.

Technique
Using photo etching not laser cut or stamping. By photo etching, the edges of the springs is smooth without any burr. By stamping, the mold cost is high and the thin products will be out of shape easily, but photo etching will keet the thin products flat enough.

Chemical Resistant Gasket,Metal Gasket With Flange,Flat Ring Metal Gasket,0.02Mm Thickness Metal Gasket

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