fræseteknologi

CNC-bearbejdning med CAXA trådskæring

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CAXA trådskæring er et softwaresystem til CNC-programmering af trådskæringsmaskiner, som har en bred vifte af anvendelser inden for trådskæring i mit land. Det kan give hurtigt, effektiv, og højkvalitets CNC-programmeringskoder til forskellige værktøjsmaskiner, i høj grad forenkle arbejdet for CNC-programmører. CAXA trådskæring kan hurtigt og præcist udføre opgaver, der er svære at udføre under traditionelle programmeringsmetoder. It can provide you with automatic programming tools for wire-cutting machine tools, allowing the operator to interactively draw the graphics to be cut, and generate two-axis cutting traces with complex contours. CAXA wire cutting supports fast-moving wire cutting machine tools, and can output 3B, 4B and ISO format wire cutting processing programs. The process of automated programming is generally: Use the CAD function of CAXA wire cutting to draw processing graphics → Generate machining track and machining simulation → Generate wire cutting program → Transfer the WEDM program to the WEDM machine tool.

The following takes the processing of a convex-concave mold part as an example to illustrate its operation process. The dimensions of the convex and concave mold are shown in Figure 1. The wire-cutting electrode wire is a molybdenum wire of φ0.1mm, and the single-sided discharge gap is 0.01mm.

CNC machining automatic programming

CNC machining automatic programming

Figur 1, Design and processing of convex and concave mold size
1> Draw workpiece drawings
1.Draw a circle
(1) Select theBasic Curve-Circlemenu item and use theCenter-Radiusmethod to make a circle;
(2) Enter (0, 0) to determine the center position of the circle, and then enter the radius value “8” to draw a circle;
(3) Don’t end the command, enter “26” when the system still promptsEnter a point or radius on the arc”, draw a larger circle, and click the right mouse button to end the command;
(4) Continue to use the above command to make a circle, enter the center point (-40, -30), enter the radius values 8 og 16, henholdsvis, to draw another group of concentric circles.

2. Draw a straight line
(1) Select theBasic Curve-Straight Linemenu item, select theTwo-point linemethod, and the system prompts to enter thefirst point (tangent point, vertical foot point)” position;
(2) Click the space bar to activate the feature point capture menu, and selecttangent pointfrom it;
(3) Click on the appropriate position of the R16 circle, and move the mouse at this time to see that the cursor draws an imaginary line. På dette tidspunkt, the system prompts to enterthe second point (tangent point, vertical foot point)”;
(4) Click the space bar again to activate the feature point capture menu, and selecttangent pointfrom it;
(5) Then determine the tangent point at the appropriate position of the R26 circle, and then the outer common tangent of the two circles can be easily obtained;
(6) SelectBasic curve-straight line”, click thetwo-point linesign, and switch to theangle linemethod;
(7) Click the drop-down mark after the second parameter, and selectX-axis anglein the pop-up menu;
(8) Click the sign ofangle=45and enter the new angle value “30”;
(9) Use the method used before to select thetangent pointand click on the appropriate position at the bottom right of the R16 circle;
(10) After dragging the imaginary line to an appropriate position, click the left button of the mouse to complete the line drawing.

3. Make symmetrical graphics
(1) Select theBasic Curve-Straight Linemenu item, selectTwo-point Line”, and switch to theOrthogonalmode;
(2) Enter (0, 0), drag the mouse to draw a vertical line;
(3) Select theCurve Edit-Mirrormenu item in the drop-down menu, and use the defaultselect axis” og “copymethods. På dette tidspunkt, the system prompts to pick up the elements, and respectively click the two straight lines just generated and the concentric circles with radii 8 og 16 at the bottom left of the graph. Click the right mouse button to confirm;
(4) På dette tidspunkt, the system prompts to pick up the axis again, pick up the lead vertical line just drawn, and after confirming, a symmetrical figure can be obtained.

4. Long round hole
(1) Select theCurve Edit-Translationmenu item, and select thegiven offset”, “copy” og “orthogonalmethods;
(2) The system prompts to pick up the element, click the circle of R8, and click the right mouse button to confirm;
(3) The system promptsX and Y direction offset or position point”, input (0, -10), it means that the X-axis displacement is 0 and the Y-axis displacement is -10;
(4) Use the above-mentioned method of making common tangents to generate the two vertical lines in the figure.

5. Final edit
(1) Select the rubber head icon, the system promptsPick up geometric elements”;
(2) Tap the plumb line and delete this line;
(3) Select theCurve Edit-Transitionmenu item, select theRound Corner” og “Cutmethods, and enter theRadiusvalue of 20;
(4) Follow the prompts to take two diagonal lines with an angle of 30° with the X axis to obtain the required arc transition;
(5) Select theCurve Edit-Cropmenu item, select theQuick Cropmethod, the system promptsPick the curve to be cropped”, and pay attention to the segment to be cut;
(6) Use the left mouse button to click on the non-existent line segments to delete them and complete the graph.

2>Trajectory generation and processing simulation
1. Trajectory generation
The trajectory generation is based on the contours that have been constructed, combined with the wire cutting processing technology, given the determined processing methods and processing conditions, and the computer automatically calculates the processing trajectory process. The following will introduce the method of wire-cutting wire-cutting trajectory generation with this example.
(1) Select theTrack Generationitem, and in the pop-up dialog box, determine the processing parameters according to the default values.
(2) In this example, there is an offset between the processing track and the figure outline. When processing the concave die hole, the wire processing track is offset to the original pattern track forgap compensation”. When processing the convex mold, the wire electrode processing track is offset outside the original pattern track forgap compensation”. The compensation distance is ΔR=d/2+Z=0.06mm, som vist på figur 2. Enter this value intofirst processing amount”, and then press OK.

Figur 2. Actual processing track

(3) The system promptsPick Contour”. This example is a concave-convex mold. Not only the outer surface but also the inner surface must be cut. Here, the concave mold hole is cut first. In this example, there are three concave mold-shaped holes. Take the circular hole on the left as an example, and pick the contour. På dette tidspunkt, the R8mm contour line turns into a red dashed line, and a pair of bidirectional green arrows appear along the contour line at the position clicked by the mouse, and the system promptsselect chain picking direction” (the system defaults to chain picking).
(4) After selecting the clockwise direction, a pair of green arrows will appear in the direction of the vertical contour line, and the system will promptSelect the side to be cut”.
(5) Because the picked contour is a concave mold hole, pick the arrow pointing to the inside of the contour, and the system promptsinput threading point position”.
(6) Press the space bar to activate the feature point capture menu, select “center of circle” from it, and then select on the R8mm circle. Det er, it is determined that the center of the circle is the threading point position, and the system promptsenter the exit point (“Enterwill coincide with the threading point)”.
(7) Click the right mouse button or press Enter, the system calculates the processing track of the concave model hole contour.
(8) På dette tidspunkt, the system prompts to continue topick contour”, and complete the processing tracks of the other two concave molds according to the above method.
(9) The system prompts to continuepick contour”.
(10) Pick up section AB, at this time section AB becomes a red dashed line.
(11) The system promptsselect chain picking direction”, “select cutting side”, “input threading point position” og “input exit pointin sequence. Select the order processing of A—B—C—D—E—F—G—H—A, and point B is the starting point of the sequence. This contour is the outer surface. Select the outer side of the processing, adjust the threading point to outside the mold base, take the point as P (-29.500, -48.178), and select this point as the exit point.
(12) a single right-end track or ESC to generate, edit track selection commandtrack jumpfeature to connect the tracks in the preceding paragraphs.

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