OVERCOMING CAD DISADVANTAGES IN THE CONSTRUCTION OF DETAIL DRAWINGS IN ACCORDANCE WITH THE REQUIREMENTS OF CURRENT STANDARDS

Abstract

The paper proposes a method for improving the construction of parametric three-dimensional models of parts and the execution of drawings to solve the problems of compliance with the requirements of current standards, in particular, the depiction of sections of parts in drawings in the Autodesk Inventor package. To solve this problem, it was proposed to use an additional parametric three-dimensional hollow element that uses the geometric information of thin walls, lugs, etc. and is tied to the sectional plane. Using the functionality of the Autodesk Inventor package, a parametric three-dimensional hollow element is built, which along the transverse plane has a size proportional and comparable to the size of thin walls, ears, etc., differing in infinitesimal value. The size of a parametric three-dimensional hollow element perpendicular to the direction of the cross-sectional plane, on the contrary, is incomparable to the size of thin walls, ears, etc. For the convenience of using a hollow three-dimensional element, it is proposed to place it in such a way that the transverse plane is the plane of symmetry for it. Such a position facilitates the use of a hollow three-dimensional element when depicting thin walls, ears, etc. on orthogonal projections in accordance with the requirements of current standards. In order to meet the requirements of current standards for axonometric projections, the sectional plane is shifted relative to the axis of symmetry beyond the hollow element of thin walls, lugs, etc. that fall into the section. Since the width of the hollow element was set as an infinitesimal value, when the sectional plane is shifted relative to the symmetry axis, the hollow element of walls, lugs, etc. is hatching. Under these conditions, by performing an axonometric projection with a longitudinal section, we obtain a minimum error in the location of the sectional plane relative to the symmetry axis of the part. The conditions for building the element(s) allow you to hide it if necessary. The construction of an additional three-dimensional hollow element(s) does not require knowledge of the built-in VBA programming language and the use of iLogic tools. Keywords: conventions and simplifications of images, projection views, axonometric, parametric hollow area, toolset, Autodesk Inventor package