SD30渔具旋臂盖的塑料注塑模具设计【说明书+CAD】
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SD30
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SD30渔具旋臂盖的塑料注塑模具设计【说明书+CAD】,SD30,渔具,旋臂盖,塑料,注塑,模具设计,说明书,CAD
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Intelligence and Automation CAD Soft WaresWith advancement of technology and high一speed development of world，Upgrade and innovation of Products are speeded up. No matter what industrial Products and appliance，are mostly molded by mold. Therefore，Plastic Parts design advances higher demands for periods and Precision of mold design and Manufacture . Because mold design depends on designers experience and Knowledge completely by traditional CAD soft wares ，50 efficiency and quality cant completely satisfy the demands of mold development. So intelligence and automation are very important in mold design .This issue Has joined the expert system to mold design，and developed an intelligentzed Injection mold design system .Basing on the Plastic Parts information，the System can implement automatically reasoning and analysis by the interrelatedknowledge，and select an relevant model from the model base，then rebuild the model by Parameterized technology，finally finish the design Process of injection mold .The entire design Process is completed by computer automatically without the calculation of designers，which decreases flaws caused by lack of experience of mold designers，and helps to avoid mistakes and improve efficiency and quality of mold design .This Paper summarized the design knowledge of injection molds side action; Then builds knowledge base suing the hybrid representation of framerepresentation and ruler representation :and introduces the Principles ，Processed method of compute automatic design system for side action in detail :Taking the best quality of Plastic Parts and highest efficiency as main purpose ，this paper finally develops side action :and also builds the graph library of side action using Parameterized technology based on Solid works .In information management system，Plastic Parts are decaled with in aspect of shrinkage and draft，which will make model、more Precision for the next design .An actual Process of the mold design for atypical Plastic Part has been demonstrated，which shows that the idea of system is feasible and this system can be used expediently to satisfy the demands of mold design. This paper also investigates menu and interface of this software，and finally Designs a laconic ，intuitive and manipulated friendly interface for injection mold design in order to make this software more acceptable to users.Mold Cavities and CoresThe cavity and core give the molding its external and internal shapes respectively, the impression imparting the whole of the form to the molding.We then proceeded to indicate alternate ways by which the cavity and core could be incorporated into the mold and we found that these alternatives fell under two main headings,namelythe integer method and the insert method.Another method by which the cavity can be incorporated is by means of split inserts or splits.When the cavity or core is machined from a large plate or block of steel,or is cast in one piece,and used without bolstering as one of the mod plates ,it is termed an integer cavity plate or integer core plate. This design is preferred for single-impression molds because of characteristics of the strength,smaller size and lower cost. It is not used as mush for multi-impression molds as there are other factors such as alignment which must be taken into consideration.Of the many manufacting processes available for preparing molds only two are normally used in this case. There are a direct machining operation on a rough steel forging or blank using the conventional machine tools, or the precision invstment casting technique in which a master pattern is made of the cavity and core. The pattern is then used to prepare a casting of the cavity or core by a special process.A 4.25%nickel-chrome-molybdenum steel(BS 970-835 M30) is normally specified for integer mold plates which are to be made by the direct machining method.The precision investment casting method usually utilizes a high-chrome steel.For molds containting intricate impressions, and for multi-impression molds, it is not satisfactory to attempt to machine the cavity and core plates from single blocks of steel as with integer molds. The machining sequences and operation would be altogether too complicated and costly. The insert-bloster assembly method is therefore used instead.The method consists in machining the impression out of small blocks of steel.These small blocks of steel are known,after machininf, as inserts, and the one which forms the male part is termed the core insert and, conversely, the one which forms the female part the cavity insert. These are the inserted and securely fitted into holes in a substantial block or plate of steel called a bloster. These holes are either sunk part way or are machined right through the bolster plate. In the latter case there will be a plate fastened behind the bolster and this secures the inserts in position.Both the integer and the insert-bolster methods have their advantages depending upon the size, the shape of the molding, the complexity of the mold, whether a single impression or a multi-impression ;old is desired,the cost of making the mold, ect. It can therefore be said that in general, once the characteristics of the mold reqired to do a particular job which have been weighed up, the decision as to which design to adopt can be made. Some of these considerations have already been discussed under various broad headings, such as cost, but to enable the reader to weigh them up more easily, when faced with a particular problem, the comparison of the relative advantages of each system is discussed under a number of headings. Unquestionably for single impression molds the integer design is ti be preferred irrespective of whether the component form is a simple or a complex one. The resulting mold will be stronger, smaller, less costly, and generally incorporate a less elaborate colling system than the insert-bolster design. It should be borne in mind that local inserts can be judiciously used to simplify the general manufactureof the mold impression.For multi-impression molds the choices is not so clear-cut. In the majority of cases the insert-bolster method of construction is used, the case of manufacture, mold alignment, and resulting lower mold costs being the overriding factors affecting the choices. For compenents of very simple form it is often advantangeous to use one design for one of the mold plates and the alternative design for the other. For example, consider a multi-impression mold for a box-type compenent. The cavity plate could be of the integer design to gain the advantages of strength, thereby allowing a smaller mold plate, while the core plate couls be of the insert-bolster design which will simplify machining of the plate and allow for adjustments for mold alignment.The Injection MoldingInjection molding ( British Engish : Molding ) is a manufacturing process for producing parts form both thermoplastic and thermosetting plastic materials.Material is fed into a heated brarel, mixed, and forced into a mold cavity where it cools and hardens to configuration of the mold cavity. After a product is designed, usually by an industrial designer or an engineer, molds aer made by a moldmaker ( or a toolmaker ) from metal, usually either steel or aluminium, and precision-machined to form the features of the desired part. Injection molding is widely used for manufacturing a varitey of parts, from the smallest compenent to entire body panels of cars.Injection molding machines consist of a material hopper, an injection ram of screw-type plunger, and a heating unit. They are also known as presses. They hold the molds in which the compenents are shaped. Presses are rated by tonnage, which expresses the amount of clamping force that the machine can exert. This force keeps the mold closed during the injection process. Tonnage can vary from less than 5 tons to 6000 tons, with the higher figures used in determined by the projected area of the part being molded.This projected area is multiplied by a champ force of 2 to 8 tons for each square inch of the projected area. As a rule of thumb, 4 or 5 t/in can be used for most products. If the plastic material is very stiff, it will require more injection pressure to fill the mold, thus more clamp tonnage to hold the mold closed. The required force can also be determined by the material used and the size of the part, larger parts require higher clamping force. Mold or die are the common terms used to describe the tooling used to produce plastic parts in molding.Traditionally, molds have been expensive to manufacture. They were usually only used in mass production where thousands of parts were being produced. Molds are typically constructed from hardened steel, pre-hardened steel, aluminium, and/or beryllium-copper alloy. The chioce of material to build a mold from is primarily one of economics. Steel molds generally cost more to construct, but their longer number of parts made before wearing out. Pre-hardened steel molds are less wear resistant and are used for lower volume requirements or large compenents. The steel hardness is tyoically 38-45 on the Rockwell-C scale ( HRC). Hardened steel molds are heat treated after machining. These are by far the superior in terms of wear resistance and lifespan. Typical hardness ranges between 50 to 60 Rockwell scale. Aluminium molds can cost substantially less , and when designed and machined with morden computerized equipment, can be economical for molding tens or even hundreds of thousands of parts. Beryllium copper is used in areas of the mold which require fast removal or area that see the most shear heat generated. The molds can be manufactured by either CNC or by using Electrical Discharge Machining processes.Standard two plates tooling: core and cavity are inserts in a mold base “Family mold ” of 5 different parts.The mold consists of two primary compenents, the injection mold ( A plate ) and the ejector mold ( B plate ). Plastic resin enters the mold through a sprue in the injection mold, the sprue bush is to seal tightly against the nozzle of the injection barrel of the molding machine and allow molten plastic to flow from the barrel into the mold , also known as cavity. The sprue bush directs the molten plastic to the cavity images through channels that are machined into the faces of the A or B plates. These channels allow plastic to run along them, so they are referred to as runners. The molten plastic flows through the runner and enters one or more specialized gates and into the cavity geometry to form the desired part.The amount of resin required to fill the sprue, runner and cavities of a mold is a shot. Trapped air in the mold can escape through air vents that are grinded into the parting line of the mold. If the trapped air is not allowed to escape , it is compressed by the pressure of the incoming material and is squeezed into the corners of the cavity , where it prevents filling and causes other defects as well . The air can become so compressed that it ignites and burns the surrounding plastic material. To allow for removal of the molded part from the mold , the mold features must not overhang one another in the direction that the mold opens , unless parts of the mold are designed to move from between such overhangs when the mold opens ( utilizing composnents called Lifters ).外文资料翻译智能型模具CAD系统随着科学技术的不断进步和社会的高速发展，产品更新换代越来越快。无论是工业产品还是家电产品，大多数应用模具成型。因此，对模具的设计和制造提出了更高的要求。传统的模具CAD软件完全依赖于设计人员的经验和知识，设计效率和设计质量很难满足模具发展的要求。因此在模具设计的过程中，使用智能型模具CAD系统显得尤为重要。本课题将专家系统技术引入到模具设计中，开发了智能注塑模具设计系统。该系统利用塑件产品信息，通过推理机对知识库中的相关知识进行自动推理、分析、决策，得出模具结构总体方案以及相关尺寸，从模型库中选出相应模型，通过参数化驱动重新建模，最终自动完成注塑模具设计过程。本文在前面几届研究生开发的基础上，总结了注塑模具斜销侧向分型与抽芯机构设计知识，结合模具设计知识的特点，利用框架/规则混合表示方法建立了注塑模具侧向分型与抽芯机构设计知识库;详细介绍了斜销侧向分型与抽芯机构的设计理论、过程和方法:系统以成型制品质量最优、效率最高为目标，最终形成了斜销侧向分型与抽芯机构的计算机自动设计系统。以Solid works为平台，采用参数化技术建立了侧向分型与抽芯机构的实体模型库。系统通过推理机对知识的推理，模型的调入，参数的驱动，实现侧向分型与抽芯机构的自动化设计。系统还对塑件模型进行了收缩率和脱模斜度的处理，实现了从塑件模型到模具模型的转化，使设计结果更加准确、严谨。通过典型制品的模具设计实例，演示了系统的设计过程。结果表明，系统设计思路正确，操作方便简单，运行可靠，适合模具设计要求。同时，本文在系统软件菜单、界面、设计思路等方面也做了大量的工作，使本系统软件更加人性化，具备了良好的实用性。型腔和型芯模具的型腔和型芯分别形成塑件内部和外部形状，型腔形状决定了塑件形状，接下来我们简要说明选择那种型腔和型芯安装在模具中。这些方式可以归纳为两大类，即整体形式和镶拼形式。另一种组成型腔的方式是加入拼块或滑块。当型腔或型芯由一块大的钢板或钢块加工而成，或是铸成一体，不需要使用支承件而形成一块模板时，就构成整体式模腔板或型芯板。这种设计因具有强度高，尺寸小和成本低的特性，而主要应用在单型腔模具中。整体式型腔和型芯一般不用在多型腔模具中，因为多型腔模具设计时必须考虑一些其他因素，例如安装组合镶件等。在模具制造的众多方法中，用于加工整体式型腔板或型芯板的方法主要有两种：使用传统机床对粗锻钢材料直接加工，或是利用精确的熔模铸造技术将坯料加工成型腔和型芯。用于制造型腔和型芯的坯料经常需要特殊工艺的处理。通常，4.25%的镍镉钼合金钢是生产整体式模板的指定材料，选用这种材料时采用直接的机加工方式。精确的熔模铸造常常用来加工高铬钢。对于成型部位复杂的模具和多腔模具，也像整体式模具那样用一块钢材加工型腔和型芯并不容易。如果采用整体式结构，则加工顺序和操作过程将变得非常复杂，成本也高，因此镶拼式装配方式替代了整体式。镶拼式型腔由小钢块加工而成。加工后的小钢块作为镶件，形成型芯部分的称为型芯嵌件，相反地，形成型腔部分的成为型腔嵌件。然后，把这些镶件牢固地安装在被称为垫板的孔中，垫板由实心钢板或钢块加工而成。这些安装孔有的是由垫板的局部凹陷形成，有的是在垫板上直接加工而成。在后一种方式中，垫板后部还要增加一块模板，起加固作用，确保镶件安装到位。整体式和镶拼式结构均有优点，这取决于塑件尺寸和形状，模具的复杂程度，所需的是单型腔模具还是多型腔模具以及模具制造成本等。通常，塑件的形状，尺寸等特性确定后，采用哪种形式的型腔和型芯就已经确定了。在不同的章节中，我们已经讨论过型腔和型芯的安装方式所涉及的问题，例如成本等，但为使读者在处理特殊问题时更容易知道重点所在，我们将用一定的章节再次讨论每种结构优缺点的对比。毫无疑问，对于单型腔模具，无论是简单
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