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CAXA Manufacturing Engineer Application Analysis and Discussion
As a domestic brand CAD / CAM software with independent intellectual property rights developed by CAXA manufacturing engineers in recent years, it has many advantages in terms of function, price and after-sales service, and has been widely used in China at present. However, some users During use often encounter a wide range of difficult problems. The following based on some of their own experience in the XP version of CAXA Manufacturing Engineer, for example, on the ribs generated, the sketch ring is not closed, guide machining trajectory generated some problems encountered some of the analysis and discussion. First, the sketch curve of the closed problem in the CAXA Manufacturing Engineer user manual has made it clear that the shape of the ribs to generate the sketch can not be closed, that is, the shape of the tendon to generate ribs are generally closed. In fact, if we use the closed sketch curve to generate the ribs, we are always prompted: "In the feature generation of the ribs, it is not allowed to contain the closed contour curve in the sketch", but it can be smoothly generated with the closed sketch curve Ribs, so the ribs should be generated sketch should not be closed. If you draw a closed outline, you can only stretch the material with the ribs to get the ribs, but not directly with ribs function. Second, the space curve rib in the CAXA manufacturing engineers can create space curve ribs, that is, the sketch curve with no contact with the entity can still generate ribs, as shown in Figure 1 Sketch curve can be generated Figure 5 Show the ribs. There are user manuals that show only one side without contact, in fact, if both ends (edges) do not touch, the same can generate ribs, as shown in Figure 2. However, it should be noted that the space curve must meet certain conditions, that is, the edge not in contact with the entity should extend in the direction of the entity and should be able to contact the entity (strictly speaking, Contact, as the following analysis at point 3) otherwise it will lead to the failure to generate ribs, as shown in Figure 3, Figure 4 shows the two cases can not be successfully generated ribs. As shown in Figure 6 ribs and solid body contact surface, drawn as shown in Figure 7 Sketch curve can be very smooth rib. As shown in Fig. 8, the ribs are non-planar contact with the small cylinder. As shown in the sketch curve shown in Fig. 9, although both ends are in contact with the two entities respectively, they always prompt operation when generating ribs failure. From Fig. 10 and Fig. 11 (a partial enlarged view), it can be seen that the ribs generated from the sketch curve shown in Fig. 9 have only one line contact with the small cylinder. Therefore, the calculation between the entities can not be performed. The reason for the operation failure. In this case, as long as a horizontal line segment (an unlimited length) is added to the small cylinder curve of the original sketch curve, the ribs can be smoothly generated. This actually results in the sketch curve satisfying the space curve described in point 2 above that the ribs must meet conditions of. Third, the problem is not closed sketch ring In the CAXA manufacturing engineer feature generation, in addition to the rib curve to generate the sketch, require the outline of the sketch used to generate features for the closed contour, otherwise it will cause the feature to generate failure. However, due to carelessness and other operational errors, resulting in sketch ring is not closed is often the case, even more familiar veteran. When this happens, some of the causes are easier to find and for some reason it is hard to find. The following two cases were analyzed: 1. Open the mark fixed case of this situation, nothing more than the extra curve is not cut off, the curve and the curve is not connected to form an opening and other reasons caused, as long as the curve extends, Cropping or redrawing the corresponding curve segments and other operations can be eliminated, relatively easy. The key is to sketch the curve, you should use more feature point capture, you can greatly reduce the occurrence of such situations. 2. Open mark changes in the open ring inspection, many people may also encounter the following situation: I found that there are a few openings mark, through the curve extension, cutting and other operations, often better Moreover, the original Where there is no opening mark, an opening mark appears again. If the mark where the new opening appears is to be disposed, the original opening position appears again. This cycle often occurs and it is indeed a headache. Some people even suspect that there is a problem with the software . This situation is mostly caused by repeated sketches of sketches, as long as the sketched sketches can be deleted. When projecting a sketched silhouette into a sketching projection object, some objects are often repeatedly boxed , Resulting in repeated projection, but not easy to detect, it is prone to such situations, and difficult to find and solve. Fourth, the location of the profile curve pick-up when the guide machining trajectory is generated Guide machining is a widely used two-axis semi-machining method that CAXA manufacturing engineers can simplify the shape, but often appears in the operation process according to the operation steps to select the profile curve And the cross-section line, it can not generate the machining path or the generated machining path does not match the requirement without warning message. The main reason for this is the inaccurate placement of the contour curve. As shown in FIG. 12 and FIG. 13, the plane profile curve ABCDEFGHIA and the section line AJ, when generating the machining trajectory shown in FIG. 14, such as when picking up the machining profile and the machining direction are prompted, first pick up the EF segment and reconnect to pick up other Section, the machining path can not be generated; if the CD section or the GH section is to be picked first, the generated machining path does not meet the requirement. The reason for this is that it is required that the section line must be within the normal plane of the contour line and intersect the contour line at the end point of the contour when generating the machining trajectory. The first curve picked up when picking a profile is the first segment of the profile whose end point is the end of the profile. Obviously, the profile and cross-sectional line obtained by the above two pick-up positions do not meet the above requirements, so the machining trajectory can not be correctly generated. In this case, you should first pick AB segment or AI segment. Figure 12 shows the first pick AB segment (profile curve, the curve BI at the A break, divided into AB, AI two segments), then you should choose the downward arrow for the chain pick up the direction That is processing direction, so that point A is the outline of the endpoint. It can also be found by exploring that if the angle between the intersection point of the section line and the contour line to the end point of the contour plane does not exceed 900, the machining trajectory can be generally generated, but the position of the machining trajectory into and out of the toolpath must be parallel to the plane of the section line , And within the plane of the contour endpoint. As shown in Figure 12, select the upward arrow, then the B point for the contour endpoint, generating processing trajectory into the retreat position over the B point in the plane. In addition, if the contour curve is a single curve (such as a full circle), then pay more attention to satisfy the above relationship when drawing the section line (you can also take the method of breaking a single curve into several segments). In the meantime, in the case of multi-segment profile curves, it is generally not advisable to combine them. Even if the combination is taken, special attention must be paid to the first curve segment picked up so that the contour endpoint and the cross-section line formed satisfy the above relationship.