Creation and assembly of machine tool motion function modules (2)
The functional module data structure and method are introduced to describe the functional modules, which can be frequently separated, assembled and adjusted during the design process. In addition, the establishment of a functional module database, which forms part of AutoCAD's library, makes it possible to design machine tools of different forms more efficiently and conveniently.
3 module assembly size parameter drive
After the function module has the above method of describing the parameters, it provides the necessary basis for the assembly between the modules, and the geometric constraint relationship between the modules must be established to truly complete the space assembly between the modules.
Geometric constraint relationships are the key to building constraint-based parametric techniques. This paper uses geometric constraints when determining the assembly relationship between structural modules.
Geometric constraints can be divided into two broad categories: structural constraints and dimensional constraints. Structural constraints are constraints that are expressed in terms of topological relationships or other relationships between geometric elements. It is divided into relational constraints and non-relational constraints. Relationship constraints include parallel, vertical, oblique, tangent, concentric, fit, symmetrical, proportional, etc. (Figure 2). Non-relational constraints include their own level and their own vertical. The size constraint is a constraint expressed by the dimensions of each geometric element, such as distance, angle, radius, diameter, chamfer, and the like.Assembly relationship
After the shape and size of each component module are determined, the assembly relationship between them is defined by the relationship constraint. In the design process, the size and shape of the component module should be continually modified. In order to make the modified module not affect the overall assembly relationship of the whole machine, all modules must be traversed to determine the connection relationship and topology between the modules before the overall assembly drawing is obtained. Relationship and record it. To this end, define a linked list structure as shown in Figure 3 to record their connection and topological relationships.In Figure 3, ai represents the module's own pointer, and bi represents the module's relationship pointer. The data structure adopted in this paper is beneficial to realize the size parameter driving, that is, when the size of the component module is changed, the topological relationship between it and other component modules is unchanged. It is more conducive to serialization, standardized design and inherited modifications to existing designs.
4 application examplesIn this paper, the above principle and implementation method are used to design the CAD layout of the horizontal machining center with the motion structure type W/X.ZY/g p /T, so as to evaluate the feasibility of the software system.
Parameter input: shape of the part group: boxMaximum size of the part group: length × width × height = 800mm × 1200mm × 600mm
After dimensioning the horizontal machining center, the following main technical parameters are obtained:Dimensional parameters: Workbench size 900mm × 1400mm:
Stroke (x × y × z) 1000mm × 830mm × 750mm: Figure 4 Overall layout of the horizontal machining center of W/X.ZY/g p /T |
The maximum diameter of the tool is Ø125mm:
The maximum length of the tool is 400mm:The machine tool dimensions are 3994mm × 3660mm × 3560mm:
Power parameters: main motor power 11kW:According to the motion function structure and layout rules, the basic size and assembly relationship of each functional module of the horizontal machining center are determined, and the overall layout diagram shown in FIG. 4 is generated by using the software.
Previous page
Piercing Screwdriver,Magnetic Screwdriver,Slotted And Phillips Screwdriver,Reversible Dual End Screwdriver
Yucheng Weisite Measuring Tools Co., Ltd , https://www.wsttools.com