CNC machining of grooved cam

In the following XKH714 CNC vertical machining produced by our factory, the curve part is refined to be more dense. This cam is an example of the groove cam of the automatic tool change position of the curve precision centering machine, and the numerical control plus requirement is introduced in ±. Within, so during the programming CNC milling process, the process flow is: the rough machining of the cam curve part is rotated according to the cam. 5 ° calculated a set of coordinate values ​​of a square CNC milling semi-finishing a curved surface heat treatment a CNC grinding method programming, CNC grinding finishing according to the cam per rotation. 25° calculation for finishing.

A, / change according to the sinusoidal acceleration curve (outer cam curve).

For 0.02mm machining, the cam curve must be smooth.

According to the pattern requirements and the parameters of the cam transmission mechanism (distance from the center of the cam to the center of the swing rod, the length of the swing rod, the lift, the radius of the roller, the radius of the base circle, etc.), a set of coordinates is established by the analytical method. Method of value programming. Because the whole cam curve is formed by the coordinates of each point, the smaller the angle between the angle of the cam and the angle during programming, the denser the point set, the more accurate the NC programming accuracy, thus ensuring the accuracy of the machining curve. Claim.

This calculation process is done automatically by the computer.

Due to the complicated structure of the cam, the inner and outer curves have certain angle requirements. To ensure the technical requirements, the positioning of the anchor, the workpiece coordinate system setting, the infeed, the path and the retraction point are arranged in this way.

CNC milling and CNC grinding use the same positioning reference and the same workpiece coordinate system, so that milling and grinding are completed at the same starting point during programming.

The path of the knife, the outer cam first moves the tool to the K point, completes the tool offset and the knife at the iC' point, moves straight to the point a, and then the workpiece is processed a-b-c-d-e-a-K" point, Retreat at K" point. The groove cam adopts the theoretical curve programming, and the groove cam path is the knife at the point A, and then the knife is lifted by A-B-C-D-E-A. The width of the groove is controlled by the G41 tool to the left and the G42 tool to the right. After the milling is finished, a certain amount of grinding is left on the curve, generally 0.4~0.6mm, the groove cam is left 0.1~0.15mm, then heat treatment is performed, the cam surface is quenched, and finally the cam grinding process is performed.

The grinding of the grooved cam, the numerical control grinding and the numerical control milling positioning reference and the cutting path are processed by the same reference method. Since the width of the groove is 24H7, the diameter of the grinding wheel rod is 10mm and the diameter of the grinding wheel is i420mm. This determines that the excessive grinding of the knife cannot be used when grinding the groove. If the tool is too large, the wheel rod is easy. Deformation occurs, and the grinding wheel is easily broken, so that a knife-knife mark appears at point A. The correct method of feeding is the application of the slot tool radius compensation function in numerical control machining (below) Nanjing Daxie Beijing Branch 2. Method and example of establishing and canceling tool radius compensation with fictitious direction OKUMAOSP system also provides a kind of use The imaginary direction is used to establish and cancel the programming method of the tool radius compensation mode, and the tool path of the tool compensation establishment method is depicted. If the G00 or G01 command of the tool offset block is followed by a 1; 1 or 1 corresponding to the selected plane, the tool path for this tool offset cancellation mode is depicted. If the G40 command in the block of the cancel tool offset mode has I or K and its value corresponding to the selected plane, they form a fictitious direction line (E-E1 in the figure), which also It can be seen as a fictional workpiece wheel line. The fictional direction can avoid the “overcut” of the workpiece contour adjacent to the “retraction point” when the tool compensation mode is canceled. This is necessary for the closed inner wheel hemp cutting. Attention.

At the point A, the arc feed and the arc retraction are used, so that the cutter mark at the point A can be eliminated, but the workpiece is limited by the groove width and the diameter of the grinding wheel. This method cannot be realized.

The method of infeed and retraction is adopted: because the groove cam adopts the theoretical curve programming, the width of the groove is controlled by G41 left deviation and G42 right deviation, and the grinding wheel first moves to point A (ie, the center point of the groove), and the spindle adopts 篼Rotate at a speed to ensure normal grinding and falling, and the tool is set to offset. 2mm, respectively, the left and right partial grinding, grinding one week back to point A, cancel the tool offset, retract the knife. Finally, in order to eliminate the small knives caused by the excessive shank, the grinding is performed once or twice by the method of dry running grinding (that is, the knife is not increased under the original bias), so that the point A can be eliminated. With the knife mark trace, the groove cam curve processed by the above method is fully tested to meet the design requirements, so that the machine tool can operate normally. (:200252) The tool compensation is established from the fictitious direction. The tool compensation is canceled by the fictional direction and the programs 0500 and 0600 are examples in which the tool radius compensation is established and canceled by the fictitious direction.

The program Q500 is the middle machining program in the middle. The starting point is at X-150, Y-150 (see block N20), the tool radius data is D8 (see block N30), and the tool compensation mode is canceled with the fictitious direction G40IU0 ( See block N110).

Program 0600 is the outer machining program in the middle, the starting point is at X-150, Y-150 (see block N20), and the "tool offset starting point" is at X60.

(Finish)

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