The software is intended to reduce design cycle time and manufacturing cost. The project involved the design for assembly dfa analysis of a paper shredder. The design for manufacturing and assembly analysis and redesign of an aircraft refueling door hinge utilizing additive manufacturing by kurt a. The dfa software estimates difficulty of assembly and with it, you can establish a rating for your product design. Dfa 10 is said to offer an improved user interface that provides faster, easiertouse analyses of parts and assemblies.
The design for assembly index dfa index indicates how easy it is to assembly a component and can be expressed as. Dfa is a systematic analysis process primarily intended to reduce the assembly costs of a product by simplifying the product design. Getting started with open broadcaster software obs. Optimize the assembly process steps identify part relevance estimate the cost of assembly the purpose of dfa is to minimize assembly cost by optimizing the assembly process and reducing the number.
Design for assembly and tear down dynamic td focused on the effort and time it takes to assemble and disassemble the products being studied is supported by commercially available computer software designed for design for assembly dfa criteria in that it can assess product designs in the same way. Dfm describes a class of techniques to improve product man. Standardize and use common parts and materials to facilitate design activities, to minimize the amount of inventory in the system, and to standardize handling and assembly operations. Using the dfa software, product engineers assess the cost contribution of each part and then. Greater role for other groups while still in the engineering phase such as manufacturing since almost 75% of the product cost is determined in the engineering phase, it gives a tool to attack. Design for assembly an overview sciencedirect topics. Forklift manufacturer streamlines design and reduces costs. By simplifying the design of a product it is possible to manufacture and assemble it more efficiently, in the minimum time and at a lower cost. Schwarz a thesis submitted to the college of engineering and the department of mechanical engineering in partial fulfillment of the requirements for the degree of master of science in. Avix dfx is the generic name for a module where focus is put on the product and its design. The design for assembly software has an improved user interface for speed and ease of use, and helps manufacturers develop more streamlined and profitable products. Dfa design for assembly definition and purpose design for assembly is a method of analyzing components and subassemblies in order to.
Technically, dfma is a systematic design procedure to analyze and quantify product design 3. The design was done by using solidwork software and analyzed by using manual and dfa software analysis to get the efficiency of current design. Choose the preferred units and enter the following. Developing dfa checklists steps in developing a dfa manual and checklist. Mar 28, 2016 nick dewhurst demonstrates the design for assembly methodology using dfa product simplification software. Dfma cuts billions in manufacturing costs design news. Dfm is manufacturing of individual component parts of a product or assembly while dfa is addition or joining of parts to form a complete product. Design for assembly dfa is a process by which products are designed with ease of assembly in mind.
Jul 18, 2016 thus he discovered the relationship between the design for assembly and the cost of the product. Lastly, the software estimates total assembly time and cost for the entire design. Application of design for manufacturing and assembly. The purpose of this design for assembly dfa guide is to assist bitteles customers in designing printed circuit boards pcbs that can be assembled in an efficient and costeffective manner.
Operator learning is simplified and there is a greater opportunity for. Design for assembly or dfa is simply a method of analyzing the assembly processes of components and their sub. The basic principles of design for assembly dfa are well established. While dfa software helps reduce a products assembly cost, dfm helps design engineers quickly judge the cost of producing the new design and compare these costs with those producing the original assembly. Design for assembly dfa process of ensuring the assembly of the pcb design and physical layout rules are met prior to prototype design for manufacturability dfm process of ensuring the manufacturability of a component or complete assembly to met suppliers capability.
Consequently, applications of dfa principles to product design usually result in improved quality and reliability and a reduction in production equipment and part inventory. Design for assembly designforassembly dfa and designformanufacture dfm techniques can be applied to products assembled manually or automatically or manufactured by specific techniques, such. It is a quantifiable way to identify unnecessary parts in an assembly and to determine assembly times and costs. Exercises are used throughout to reinforce understanding of dfma principles. The design for assembly dfa index calculator computes design for assembly index. Design for manufacturing and assembly dfma is an engineering methodology that focuses on reducing timetomarket and total production costs by prioritizing both the ease of manufacture for the products parts and the simplified assembly of those parts into the final product all during the early design phases of the product lifecycle. The development and use of a software program that not only predicts a boards cost but also provides indices of its manufacturability, called pcb design for assembly pcb dfa, are described.
Whether or not your product is designed well for assembly can be critical to its quality, price and design longevity, yet dfa is often a neglected step of the design process. Two parts can be combined if they meet the following conditions. Design for assembly examples dfa design for assembly is all about reducing the number of parts that must be manufactured and reducing the cost to assemble the parts into a finished product. Coming up with an idea and quantifying it so it could be applied widely was the combination that gave birth to dfa. The dfa software is used eva luate t he assembly process of a product. It includes over 240 examples of good and bad design for manufacturability and assembly practices. To reduce the number of parts, try to combine parts. Then, by applying boothroyd dewhurst dfa method guideline, alternative design was generated and analyzed using the same. Geometric dfx is a design for manufacturability and design for assembly software that facilitates the implementation of dfx methods and guidelines in a systematic manner in an organization and improves the design process. The institution of specific steps that target the assembly process into a pcb development dfm regimen is known as design for assembly dfa. Design for assembly dfa techniques aim to reduce the cost and time of assembly by simplifying the product and process through such means as reducing the number of parts, combining two or more parts into one, reducing or eliminating adjustments, simplifying assembly operations, designing for parts handling and presentation, selecting fasteners for ease of.
Using the analysis the assembly time for paper shredder was estimated. Design for manufacturing guidelines design for manufacturing dfm and design for assembly dfa are the integration of product design and process planning into one common activity. Dfa software is used to reduce the complexity of a product by consolidating parts into elegant, multifunctional designs. Design for manufacturing and assembly overviews, steps. The following sections will define the various tolerances, rules, and procedures to which bittele adheres during the pcb assembly process. Dfma is typically done dfa first and then dfm second. Technically, dfma is a systematic design procedure to analyze and quantify product design. Design for manufacturabilityassembly workshop npdsolutions. Design for manufacture and assembly dfma is a design approach that focuses on ease of manufacture and efficiency of assembly. The workshop concludes with an exercise to analyze your companys assemblies. Dfma is the combination between design for manufacturing dfm and design for assembly dfa.
Design products for easier manual or automatic handling in assembly. Geoff came up with a database to evaluate the labor content in a design. To succeed, you must design products right the first time for optimal manufacturing, cost, quality, time, and functionality. Design for manufacturing and assembly overviews, steps, advantages what is dfma. Design for manufacture means the design for ease of manufacture for the collection of parts that will form the product after assembly. Dfmpro, a cadintegrated design for manufacturing software helps you identify and correct downstream issues early in the design stage, leading to reduction of cycle time and, in turn, resulting in highquality products. Dfa complements boothroyd dewhurts design for manufacture dfm software. Support is given by examples and search functions thereby making the. Design for manufacture and assembly dfma designing buildings wiki share your construction industry knowledge.
Design for manufacture, which means the design for ease of manufacture of the parts that will form a product, and design for assembly, which means the design of the product for ease of assembly. Dfm software then allows the design engineer quickly to judge the cost of producing the new design and to compare it with the cost of producing the original assembly. At symbol technologies, the products are all about information. Because dell relies on metrics to gauge design improvement, dfa analyses occur at. Dfa product simplification allows engineers to scrutinize parts and assemblies for structural efficiency, guiding them toward the creation of single, multifunctional components with. Design for assembly dfa and design for manufacture dfm concurrent costing. Optimization of the part system assembly dfa is a tool used to assist the design teams in the design of products that will transition to productions at a minimum cost, focusing on the number of parts, handling and ease of assembly. Dfa goes by many names, such as dem design for economic manufacture, dfma design for manufacture and assembly, or pdfa product design for assembly. Dfm is the practice of designing products keeping manufacturing in mind. Jun 01, 2003 the dfa software then helps the team to rate each part on its difficulty of orientation and assembly.
While minimizing assembly operations, it helps in eliminating component redundancy, facilitates assembly and manufacturing of products that are cost effective in terms of material requirements, parts production, labor and overhead. Design for manufacture and assembly dfma designing. Student will know the different types of assembly methods and their advantagesdisadvantages 2. Common parts will result in lower inventories, reduced costs and higher quality. If a product contains fewer parts it will take less time to assemble, thereby reducing assembly costs. Used together, dfm and dfa software gives engineers an early cost profile of product designs, providing a basis for planning and decision making. The purpose of dfa is to minimize assembly cost by optimizing the assembly process and reducing the number of parts. Manufacturability issues are not functional issues although higher risks designs can result in functional issues or even outright failures. Dfma design guidelines design for top down assembly make parts self locating try to design parts with symmetry if symmetry is not possible then make it obvious that the part needs a specific orientation. Feb 10, 2015 design for assembly dfa is a vital component of concurrent engineering the multidisciplinary approach to product development. The method is a design evaluation tool that enables designers to. The analysis was performed using boothroyd and dewhurst dfa method.
Dfa index an essential ingredient of the dfa method. The method of design for manufacturing and assembly dfma can be used to redesign a product. Software guides assembly line designers machine design. Design for assembly analysis our dfa analysis checks designs and boms for some of the most common manufacturability issues that will slow or even stop an assembly project. The design for assembly dfa methodology was pioneered by boothroyd and dewhurst at the university of rhode island. Design for assembly software updated digital engineering 247. Starting in 1977, geoff boothroyd, supported by an nsf grant at the university of massachusetts amherst, developed the design for assembly method dfa, which could be used to estimate the time for manual assembly of a product and the cost of assembling the product on an automatic assembly machine. In addition, if the parts are provided with features which make it easier to grasp, move, orient and insert them, this will also reduce. Design for assembly dfa seeks to simplify the product so that the cost of assembly is reduced. Design for manufacturing and assembly dfma is the method for process and cost optimization of subsystems, whole system as well as the entire manufacturing process. Dfa is the method of design of the product for ease of assembly. Dfma advantages quantitative method to assess design communication tool with other engineering disciplines and other departments sales, etc. Boothroyd dewhurst launches dfa 10 product simplification. Design for manufacturing and assembly dfma siemens.
Dfa design for assembly from the technology data exchange linked to trusted tde listed vendors. The software rates each part according to how it is grasped, oriented and moved for insertion, and how it is inserted andor fastened onto the product. Design for assembly software supports lean manufacturing. Dfa design for assembly is all about reducing the number of parts that must be manufactured and reducing the cost to assemble the parts into a finished product. It is in this it is in this software, where the user is suggested to eliminate or combine the parts. Dfma design for manufacturing and assembly examples. Dfa index is the assembly time for an ideal design divided by the total assembly time and expressed as a percentage. As the design team conceptualizes alternative solutions, it should give serious consideration to the ease of assembly of the product or subassembly. The design stage is the best time to address and fine tune such details as material types, material forms, tolerances, designs and shapes. N m this is the theoretical minimum number of parts t m this is the minimum assembly time per part t a this is the estimated total assembly time s. Design for assembly is a methodology for evaluating part designs and the overall design of an assembly. Student will understand and be able to explain the need for dfa 4.
Dfma stands for design for manufacture and assembly. The importance of designing for manufacturing is underlined by the fact that about. It does so by first reducing the number of parts in the product design, and then by ensuring that remaining parts are easily assembled 5, 101. The dfa index is a figure obtained by dividing the theoretical minimum assembly time by the total assembly time. Student will know what to consider when designing for assembly for each of the assembly methods 3. Optimize the assembly process steps identify part relevance estimate the cost of assembly. The design for manufacturing and assembly analysis and. Designing verifiable and unmistakable assembly steps can improve the yield of the product and improve the quality of the finished product. Why dfa is important to your pcb design process tempo. Design for manufacturing assembly dfmdfa qualityone. To consistently perform dfma, a systematic and quantifying approach must be used that allows engineers to anticipate manufacturing issues whilst changes can still be made. Design for assembly software updated digital engineering. With an ideal design there is a minimum of parts and no assembly difficulties. That was the late 1970s and the early 1980s, said raposa.
Optimization of the partsystem assembly dfa is a tool used to assist the design teams in the design of products that will transition to productions at a minimum cost, focusing on the number of parts, handling and ease of assembly. Jul 02, 20 an overview of the basics of the latest version of design for assembly. The idea behind dfa is to minimize the number of parts in a product while the assembly line package looks for. Design for manufacturing rules design rules for specific processes with exercises. Jun 18, 20 the software screens and code have been rewritten from the ground up, empowering users with more of the information needed to quickly make important design decisions. Assembly methodology using dfa product simplification software. Dfa is often confused with, but is actually a subset of, dfm design for manufacture. Design for manufacture and assembly software helps the company to reduce assembly costs and times. Headquartered in holtsville, new york, the company creates mobile and fixed devices that capture information, manage it in small and large computers, and communicate it over networks throughout the business enterprise.
But before laying out guidelines that constitute good dfa, lets take a look at why its important for pcb product development. To design for manufacture and assembly is to design products with ease and economy of manufacturing and assembly foremost in mind. The goal is to design a product that is easily and economically manufactured. Geometric dfx assists design engineers to validate 3d cad parts and assemblies for various downstream issues related to. Its done in this order because one of the main tenets of dfa design for assembly is to reduce the number of parts as much as possible. Apr 05, 2018 the institution of specific steps that target the assembly process into a pcb development dfm regimen is known as design for assembly dfa. Avix dfx simplifies and standardizes how to work with issues of manufacturability design for assembly. Design for assembly analysis of a paper shredder on behance. You might think it strange to begin by thinking about the assembly before you have designed all the components, but you can often eliminate many parts at the conceptual stage, and save yourself a lot of trouble. Design for manufacturing aims to simplify the manufacturing of each part. Overview of design for manufacturing and assembly dfma. These estimates are important yardsticks for measuring dells dfx process.