Creating dimension pattern features in the hottest

2022-07-31
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Ideas and methods of creating dimension array features in pro/engineer

content abstract: array features are often a bottleneck in the process of efficient design. Through typical examples, this paper summarizes and introduces the ideas and methods of creating various commonly used dimension array features in general cases in pro/engineer, in order to help designers better complete the creation of this feature and draw inferences from one instance. 1、 Introduction in the process of part modeling with pro/engineer, we often encounter some identical or similar features that appear repeatedly many times. If these features are created one by one, the design process will

array features, which is often a bottleneck in the efficient design process. Through typical examples, this paper summarizes and introduces the ideas and methods of creating various commonly used dimension array features in pro/engineer, in order to help designers better complete the creation of this feature and draw inferences from one instance

I. Introduction

in the process of part modeling with pro/engineer, we often encounter some identical or similar features that appear repeatedly many times. If these features are created one by one, the design process will be very cumbersome. At this time, you can consider using pattern features for modeling. Patterned features are multiple copies of objects arranged in a specified way. They can perform operations or modifications on multiple features contained in a pattern at the same time, which is more convenient and efficient than operating on individual features. However, due to the variation of part features, designers can not grasp the ideas and methods of using pattern features, resulting in regeneration failure or failure to achieve the original design intent. For some designers, especially beginners, how to understand and make good use of array features has become a bottleneck of efficient design

in wildfire version of pro/engineer, array features include dimension array, reference array, table array and filled array. Among them, the size array is widely used. The wildfire version is taken as an example to introduce and realize the idea and method of creating the feature of the size array by analyzing the control modes such as constant stress and constant displacement through a typical example to transfer the light from the center of the light collector to the condenser under the stage

2. Ideas and methods for creating dimension array features

creating dimension array features is a process of feature replication by using driven dimensions and assigning incremental changes to arrays. Dimension arrays can be unidirectional or bidirectional. According to the selected drive size, the array can be linear or angular (rotate the array of yellow warning and production restriction order issued by Tangshan City for major activities this month). To complete a dimension pattern feature, it is necessary to determine the driving dimension and dimension increment. In pro/engineer, these two elements can be entered through the "size" panel shown in Figure 1

Figure 1 "dimension" panel

the idea and method of creating various types of dimension array features are introduced as follows

1. Linear array

(1) basic linear array

the creation of basic linear array only needs to determine the driving size and size increment according to the requirements of the feature. The driving size can be directly selected from the parameters of the feature itself. The operation is simple, and the generated features are easy to realize. However, the results of choosing different driving dimensions in different directions are very different, which requires the designer to have a clear selection idea

the following takes the array characteristics of plate openings as an example, and different results will be produced by different driving size selection methods, as shown in Table 1

it can be seen from table 1 that the array feature can not only control the position of the copied feature, but also control the change of its shape and size. If the result is 3, just set the increment of D3 driving dimension as "D4 - D3" to get the result. Table 1 lists only some basic changes. As long as we master the method of driving size selection, it is not difficult to grasp other array changes

table 1

(2) linear array with constraints

linear array with constraints means that there are specific constraints on the position and shape changes of array features. The creation of this feature can not be directly completed only by the parameters of the feature itself as the driving dimension, but also by adding auxiliary constraint datum or other elements. In the process of creating features, the failure to reach the original design intent is often due to the failure to correctly define the constraints of the first main feature

the example shown in Figure 2 is the array feature of opening pores on a flat plate. From the shape analysis of the feature, the two sides of the oblong holes in the array are growing downward along two straight lines, belonging to a unidirectional size array, but can not be completed with a basic linear array. The key point of creating the pattern feature is the creation of the main feature of the pattern. The sketch section view is shown in Figure 3. The construction line (dotted line) is the auxiliary constraint datum mentioned above, and sd16 is the driving dimension. It should be noted that the construction line must be completely constrained, otherwise the results in Figure 2 will not be obtained. After the main feature is created, the vent shape in Figure 2 can be obtained according to the general array operation steps

Figure 2 vent array

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