How to design plastic parts for assembly knowledge. Other readers will always be interested in your opinion of the books youve read. This, however, is not taken into account in the calculation of the assembly forces in the sections below. Design engineering guide success through innovation screws for plastic. Solidworks is an extremely powerful computer aided design cad software that utilizes mathematical equations parametric variables to build parts from scratch. Designing plastic parts for assembly books pics download. Sep 22, 2015 designing of plastic products for injection moulding lecture snap fit less than 90. The intersection of the base of the boss with the nominal wall is typically stressed and stress concentration increases if no radii are provided.
Plastics05555 2014 designing plastics parts for assembly. Encourage modular design design for a base part to locate other components. How to design snapfit joints for 3d printing 3d hubs. Designing components with snap fits can save you time and money in production by reducing material costs and part quantities as well as improving ease of assembly. This information can only be provided by raw materials suppliers, specialist plastics product designers and plastics processors but there is a need to get the basics of the product design right in the first. Some applications require the plastic part to weather at the same. Since reading the book years ago and usingpaultres as aconsultant, designing plastic parts for assembly has becomemusthaveliteraturefor anyonejoining the interiors design department at mercedesbenz u. Designing plastic parts and components involve implementing wide knowledge. Designing plastic parts for assembly provides an excellent tool for both seasoned part designers and novices to the field, facilitating cost effective design decisions and ensuring that the plastic parts and products will stand up under use.
Metal threaded inserts can be added to plastic injection molded parts to provide a durable threaded hole for fasteners such as machine screws. Encourage modular design design for a base part to locate other components design for component symmetry for insertion. Tres isbn 34464032 inhaltsverzeichnis weitere informationen oder bestellungen unter. Learning to use the tool efficiently is an incredibly useful skill that is an essential item for the modern. Designing plastic parts for assembly 8e ebook hanser.
Designing of plastic products for injection moulding lecture wall thickness. The main design consideration of a snapfit is integrity of the assembly and strength of the beam. First, you need to consider several factors to produce a costeffective product that performs at the level it needs to. Pdf designing plastic parts for assembly semantic scholar. Description download designing plastic parts for assembly comments. The detailed yet simplified discussion of material selection, manufacturing techniques, and assembly procedures enables the.
Designing for assembly and disassembly 1 thousands of parts are joined together in each automobile, such as the plastic metal hybrid grill opening reinforcement in this ford focus. Designing your plastic part when designing parts for injection molding, the manufacturing process is an important consideration. It is common for plastic parts to be fastened to other components that are not. Each individual formulation was then produced by compounding the unfilled resin with a single additive or filler, and was. Injection molding is so popular, because of the dramatically low cost per unit when manufacturing high volumes. Snapfit joints for plastics a design guide by bayer mit fab lab.
Designing plastic parts for assembly free download as pdf file. The advantage of using inserts is that they allow many cycles of assembly and disassembly. As a result of these deformations during the assembly operation, the geometric relationships change e. Do not design taper fits between metal and plastics parts, because stress cracking will. Check that tolerance buildup does not cause overstress during and after assembly and that the fit is still adequate after assembly. A snapfit joint can be designed so it is easily separated or so that it is.
Pdf designing plastic parts for assembly free download pdf. The detailed, yet simplified discussion of material selection, manufacturing techniques, and assembly procedures enables the reader to evaluate plastic materials and to adequately design plastic parts for assembly. Detailed plastic product design will always require detailed knowledge of the application, the processing method and the selected plastic. The detailed yet simplified discussion of material selection, manufacturing techniques, and assembly procedures enables the reader to evaluate plastic materials and design plastic parts with confidence. Designing plastic parts for assembly hanser publications.
Jun 10, 2018 download designing plastic parts for assembly. Designing plastic parts for assembly hanser fachbuch. It is particularly important to bear the following factors in mind when designing snap joints. Ihaveno reservations about enthusiastically recommending this book toanyoneinvolved in the fieldofplasticparts design. However, not every plastic part design can be efficiently injection molded. How to select fasteners for plastic joints by lokesh kumar chief design engineer eisen electric corp. Designing plastic parts for assembly hanser elibrary. In a manufacturing firm, different products can share parts that have been designed for multiuse. The integrity of the assembly is controlled by the stiffness k of the beam and the amount of deflection required for assembly or disassembly. Direct modeling means you can push and pull directly on geometry. Solidworks tips for those in design and engineering. Sharp corners may also effect plastic flow, producing parts with. Injection molding is a process in which solid thermoplastic resin pellets are melted, injected into a mold, and then cooled back to a solid state in a new form.
If youre anywhere in the design and engineering space, chances are youll need to be fluent in solidworks. Snapfits for assembly and disassembly presented by. For over 22 years, designing plastic parts for assembly has been the definitive guide for both seasoned part designers and novices to the field, facilitating costeffective design decisions and ensuring that the plastic parts and products will stand up under use. Kenney, senior design specialist at the chestnut run technical services laboratory, completes the series with a new look at press and. For over 22 years, designing plastic parts for assembly has been the definitive guide for both seasoned part designers and novices to the field, facilitating. Tim spahr technical service engineer november 1991 revised 100 ticona ticona a business of celanese ag.
Designing plastic parts for assembly deformation engineering. Part 1 introduced what assembly design is all about and examined a couple of assembly design methods and can. Designing of plastic products for injection moulding dsource. At the very least, you try to minimise the parts needed, which can save costs. Understanding and selecting the right process for plastic part assembly. May 30, 2012 new high performance plastics and innovative molding processes make this possible. The designers and engineers at api have over 250 combined years of experience in designing parts for plastic injection molding, selecting materials, and processing resins specializing in engineering and high performance resins.
Secondary operations most parts are shipped as molded. Designing plastic parts for assembly, 3rd edition process. Bosses can be added to the part design for assembly, locating, or mounting of a part. However, if the parts will be assembled with screws, overlooking such parameters as thread style, driver speed and boss design could spell disaster on the assembly line. Designing plastics parts for assembly, 7th edition, an excellent tool for both seasoned part designers and novices to the field, facilitating cost effective design decisions and ensuring that the plastic parts and products will stand up under use. Part design guidelines for injection molded thermoplastics recommended by our computeraided engineering support services. Straight pull design parts that qualify for rapid injection molding must be designed as straightpull parts. Bonds created using this method are permanent and involve the parts being joined by using a strong solvent to soften the joint interface before the parts are pressed together. When designing a product, you naturally want to avoid too many parts that need assembling. Our design engineers can provide you with more information and assistance in designing your inserts.
Almost every plastic part around you was manufactured using injection molding. Solidworks 2015 sp5 will slow down to a crawl when you do drawings with an assembly with lots of plastic. Part design guidelines for injection molded thermoplastics. This information can only be provided by raw materials suppliers, specialist plastics product designers. Designing plastic parts for assembly tres, paul a download. Sharp corners act as stress risers or concentrators, reducing part strength and causing premature failures. Whether youve loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. Aug 19, 2014 solvent and adhesive bonding is arguably the least restrictive joining method for plastic parts in terms of design and part geometry.
This guide was designed to demonstrate the basic elements of proper plastic part design. Designing plastic parts for assembly the english editions of the textbook are distributed worldwide by carl hanser verlag munich, germany and hanser publications cincinnati, ohio, usa. This book provides an excellent tool for both expert in the plastics field, and designing plastic parts for assembly enjoys a well. Semantic scholar extracted view of designing plastic parts for assembly by paul a. This will ultimately reduce material and manufacturing costs. Loctite design guide for bonding plastic ellsworth. Designing plastic parts is a complex task involving many factors that address a list of requirements of the application. Whether you are just entering the field, or are a seasoned plastic parts designer, designing plastic parts for assembly is an excellent tool that will facilitate costeffec tive design decisions, and help to ensure that the plastic parts and products you design stand up under use. Bosses are the cylindrical elements in the plastic parts which are used as a mounting point or a location point. Part walls that are perpendicular to the vibration motion must be robustly designed so that they. Mating metal and plastic parts do not design taper fits between metal and plastics parts, because stress cracking will occur from overtightening. Designing plastic parts for assembly sciencedirect. Designing plastic parts for assembly assembly magazine.
These parts can have the same or different functions when used in different products. Avoid heavy parts that will increase worker fatigue, increase risk of worker injury, and slow the assembly process. General input on the best molding method for the design concept should be sought early in the design process so the part shape can be optimized accordingly. Plastic part design for assembly provides an excellent tool for both seasoned part designers and novices to the field, facilitating cost effective design decisions and ensuring that the plastic parts and products will stand up under use. Minimum radius at base of boss a fillet of a certain minimum radius should be provided at the base of a boss to reduce stress. Plastic design issues injection molded plastic parts offer an important combination of flexibility, toughness, and chemical resistance for cost effective, longterm performance in a wide range of. During both the injection and cooling stages of the. The chinese edition of the textbook is published and distributed by chemical industry press of beijing, china. Some latches will be used only once for assembly during the manufacturing process.
When designing plastic parts, your team should consist of diverse players, including conceptual designers, stylists, design engineers, materials suppliers, mold makers, manufacturing personnel, processors, finishers, and decorators. With so many ways to formulate plastic to get just the right combination of color, texture, strength and durability, its easy to forget how the parts will be assembled. Understanding and selecting the right process for plastic. While in the past injection molding has been the only viable method for producing snap fit joints in plastics, 3d printing opens up new opportunities and challenges in their design. How to design plastic parts for assembly knowledge centre.
Designing of plastic products for injection moulding. Since reading the book years ago and usingpaultres as aconsultant, designing plastic parts for assembly has becomemusthaveliteraturefor anyonejoining the interiors. For over 22 years, designing plastic parts for assembly has been the definitive guide for both seasoned part designers and novices to the field, facilitating costeffective design decisions and ensuring that the plastic parts nd products will stand up under use. Injection molded plastic parts offer an important combination of flexibility, toughness, and chemical resistance for cost effective, longterm performance in a range of applications. Because mechanical friction is used to create the weld, the design of the parts must allow for relative motion between the mating surfaces of at least 0. Tres designing plastic parts for assembly book isbn. Designing plastic parts for assembly view abstracts add to favorites email download citations. In many cases, the solidification is not isotropic, so that a single value of mold shrinkage does not. The key is to understand the elements that are touched by designing plastic parts and communicate within these crossfunctional areas to ensure the part and the design as a whole is a success.
Api is experienced in molding all thermoplastics, specializing in engineering, high performance, and glass reinforced resins. Design the work station area to minimize the distance to access and move a part. When designing snapfit latches, one consideration is the expected service. How to design snap fit components fictiv hardware guide. Ihavealso recommended his services toother organizations insideand outside the autoindustry. Designing plastic components plastics technologies and services qmr plastics offers a wide range of technical services and production capabilities for producing close tolerance components. Designers usually take one of two approaches to 3d design and solid modeling. Plastic component design considerations design considerations radii in the design of injection molded parts, sharp corners should be avoided. Avoid parts that are sticky or slippery thin oily plates, oily parts, adhesive backed parts, small plastic parts with smooth surfaces, etc. Inserts are installed in injection molded parts through thermal, ultrasonic or inmold insertion. Deformation during the assembly of snapfit joints can be significant.
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