-
Study on the correlated design method of plate holes for progressive dies based on functional feature
- 上一篇：建筑节能投资决策英文文献和中文翻译
- 下一篇：模具热处理及其导向平行设计英文文献和中文翻译
Abstract :There are a lot of holes in a progressive die for mounting inserts, assembles, and standards. This papergives the classification of plate holes of progressive die design according to their structural types and relationships between the correlating parts and the plate holes anddescribes an automated hole design system for progressive dies. Taking advantage of prebuilt design knowledge and standard parts database, this system is able to generate thecorrelated holes on the main plates of progressive dies, such as upper die shoes, lower die shoes, stripper plates, punch plates, die plates, punch backing plates, and die backing plates according to the inserted parts or functional assembles. A descriptive model is set up. The feature library technology is adopted to develop the function for the design of plate holes, which can improve the efficiency and shorten the design cycle. The hole design system is built on the top of SolidWorks, taking advantage of its built-in modules, including part, assembly, and drawing. We use progressive die for motor core as concrete examples to demonstrate the power of our system. Experimental results show that our system cannot only improve the design quality but also reduce the design time and cost.20226
Keywords: Progressive die; Hole; Correlated design; Library feature
1 Introduction
A progressive die is used in various industries such as aerospace, electronics, automobiles, and electrical appliances for producing sheet metal components in large quantities. As a progressive die may contain a large number of operations such as punching, blanking, bending, lancing, et al., it has been regarded as complex and requires a great deal of expertise.
Usually, the progressive design procedure is composed of two phases, operations (stamping process) planning and die structure design. Stamping process planning is to produce a flat pattern of a model of stamped metal and then plan stamping operations to obtain strip layout. The die structure design process is as follows: (1) according to the size of the strip layout, the die set is determined and the overall structure of die is generated; (2) then the inserts, punches, dies, and other forming parts are designed including positioning and locating holes; and (3) based on the specific circumstances, assistive devices are inserted such as pilot pins, ejectors, screws, dowel pins, springs, standard parts, etc. The progressive die structure design usually costs about 2/3 design cycle time. There are a lot of holes in a progressive die for mounting inserts, assembles, and standards, and hole design is tedious, time-consuming, and error prone. This study is concentrated on the correlated design of holes on plates.
The developments of automated, basic knowledge and intelligent design systems are studied by researchers all over the world. Cheok and Nee presented a review of research and design before 1998 in the design automation of tools for metal stampings and proposed a framework for an integrated design system for progressive dies[1]. Wang et al. did some research of association technology in assembly design for precision progressive die on AutoCAD[2]. Kumar et al. developed an intelligent system for automatic modeling of progressive die¬¬¬¬[3]. They also presented an expert system for automation of strip-layout design process using the production rule-based expert system approach of artificial intelligence on AutoCAD[4]. Choi et al. developed a system written in AutoLISP on the AutoCAD for strip layout and die layout and a tool kit on the SmartCAM software for modeling and postprocessing with a PC [5–7]. Based on knowledge-based rules, Kim et al. developed a system for electric product with bending and piecing operations written in AutoLISP on the AutoCAD with a PC [8]. Tor et al. investigated the suitability of using a blackboard framework for stamping process planning in progressive die design [9]. Li et al. adopted feature- and rule-based approach and developed an integrated modeling and process planning system for planning bending operations of progressive dies using C++ and ObjectARX of AutoCAD [10]. Farsi and Arezoo described a two-stage method to determine bending sequence in progressive dies [11]. Chang et al. established a genetic algorithm to solve the problems of ranking the working steps in progressive dies using AutoCAD as a drawing tool [12]. Taking advantage of neural network and computer-aided design (CAD) software, Pilani et al. proposed a method for automatically generating an optimal die face design based on die face formability parameters [13]. Based on sheet metal operations, Singh and Sekhou developed a punch machine selection expert system, which was built in AutoCAD and used AutoLISP [14]. Jiang et al. proposed a flexible and complete insert representation scheme and analyzed the complex assembly relationships and constraints between inserts and components [15]. Almost all the design systems mentioned above belong to 2D patterns.