目 录.doc

显示器支架扣件塑料注射模具设计【14张CAD图纸和说明书】

收藏

压缩包内文档预览:
预览图 预览图 预览图
编号:10118838    类型:共享资源    大小:8.73MB    格式:RAR    上传时间:2018-05-23 上传人:俊****计 IP属地:江苏
40
积分
关 键 词:
显示器 支架 扣件 塑料 注射 模具设计 14 cad 图纸 以及 说明书 仿单
资源描述:

目  录

1 绪论………………………………………………………………………………1

1.1模具在加工工业中的地位………………………………………………… 1

1.2模具的发展趋势…………………………………………………………… 1

1.3本次设计的意义…………………………………………………………… 2

2 产品分析………………………………………………………………………4

2.1塑件分析……………………………………………………………………4

2.1.1结构分析……………………………………………………………………4

2.1.2尺寸精度分析………………………………………………………………6

2.1.3表面质量分析………………………………………………………………6

2.2材料分析………………………………………………………………………6

2.2.1功能设计……………………………………………………………………6

2.2.2材料选择……………………………………………………………………6

2.2.3ABS的成型性能……………………………………………………………7

2.2.4塑件材料的成型条件……………………………………………………7

2.2.5塑件体积和质量的计算…………………………………………………8

2.2.6初选注塑机…………………………………………………………………9

3 分型面及型腔的确定………………………………………………………10

3.1分型面的选择…………………………………………………………………10

3.2型腔数目的确定………………………………………………………………11

3.2型腔的分布……………………………………………………………………12

4 浇注系统的设计……………………………………………………………14

4.1浇口形式及位置的选择………………………………………………………14

4.2主流道杯的设计………………………………………………………………15

4.3主流道的设计…………………………………………………………………16

4.4分流道的设计…………………………………………………………………16

5 成型零件的结构设计………………………………………………………16

5.1定模的结构设计……………………………………………………………17

5.2动模的结构设计……………………………………………………………17

5.3成型零件的相关计算…………………………………………………………18

5.3.1型腔尺寸的计算…………………………………………………………19

5.3.2型芯尺寸的计算…………………………………………………………21


5.3.3型腔深度尺寸计算………………………………………………………22

5.3.4型芯高度尺寸计算………………………………………………………22

5.3.5型孔之间的中心距计算…………………………………………………23

5.4型腔侧壁和底板厚度计算……………………………………………………23

5.4.1型腔侧壁厚度计算………………………………………………………23

5.4.2底板厚度计算……………………………………………………………24

6 导向机构设计 ………………………………………………………………26

6.1导向机构设计………………………………………………………………26

6.1.1导柱设计…………………………………………………………………26

6.1.2导套设计………………………………………………………………26

6.2推出机构设计…………………………………………………………………27

6.2.1脱模力的计算……………………………………………………………27

6.2.2推出机构的选择…………………………………………………………28

6.3拉杆设计………………………………………………………………………29

6.4锁模机构设计…………………………………………………………………30

7 冷却及排气系统设计………………………………………………………31

  7.1冷却系统设计………………………………………………………………31

  7.2排气系统设计………………………………………………………………33

8 注塑机的校核 ………………………………………………………………35

 8.1模具闭合高度的确定………………………………………………………35

 8.2开模行程的校核……………………………………………………………35

 8.3最大注塑量的校核…………………………………………………………36

 8.4锁模力的校核………………………………………………………………37

 8.5注射压力校核………………………………………………………………37

 8.6喷嘴尺寸的校核……………………………………………………………37

9 模具工作原理 ………………………………………………………………39

 9.1模具总装图…………………………………………………………………38

 9.2模具开合模动作……………………………………………………………42

10 可行性分析…………………………………………………………………43

   10.1实用性分析…………………………………………………………………43

   10.2经济和环境性分析…………………………………………………………43

11 总结与展望…………………………………………………………………44

致谢………………………………………………………………………………45

参考文献 ………………………………………………………………………46

毕业设计(论文)独创性 …………………………………………………47


 毕业设计(论文)知识产权声明…………………………………………48

 附录………………………………………………………………………………49

 1  绪论

1.1模具在加工工业中的地位

模具是利用其特定形状去成型具有一定的形状和尺寸制品的工具。在各种材料加工工业中广泛的使用着各种模具。例如金属铸造成型使用的砂型或压铸模具、金属压力加工使用的锻压模具、冷压模具等各种模具。

对模具的全面要求是:能生产出在尺寸精度、外观、物理性能等各方面都满足使用要求的公有制制品。以模具使用的角度,要求高效率、自动化操作简便;从模具制造的角度,要求结构合理、制造容易、成本低廉。

模具影响着制品的质量。首先,模具型腔的形状、尺寸、表面光洁度、分型面、进浇口和排气槽位置以及脱模方式等对制件的尺寸精度和形状精度以及制件的物理性能、机械性能、电性能、内应力大小、各向同性性、外观质量、表面光洁度、气泡、凹痕、烧焦、银纹等都有十分重要的影响。其次,在加工过程中,模具结构对操作难以程度影响很大。在大批量生产塑料制品时,应尽量减少开模、合模的过程和取制件过程中的手工劳动,为此,常采用自动开合模自动顶出机构,在全自动生产时还要保证制品能自动从模具中脱落。另外模具对制品的成本也有影响。当批量不大时,模具的费用在制件上的成本所占的比例将会很大,这时应尽可能的采用结构合理而简单的模具,以降低成本。

现代生产中,合理的加工工艺、高效的设备、先进的模具是必不可少是三项重要因素,尤其是模具对实现材料加工工艺要求、塑料制件的使用要求和造型设计起着重要的作用。高效的全自动设备也只有装上能自动化生产的模具才有可能发挥其作用,产品的生产和更新都是以模具的制造和更新为前提的。由于制件品种和产量需求很大,对模具也提出了越来越高的要求。因此促进模具的不断向前发展。

1.2模具的发展趋势

近年来,模具增长十分迅速,高效率、自动化、大型、微型、精密、高寿命的模具在整个模具产量中所占的比重越来越大。从模具设计和制造角度来看,模具的发展趋势可分为以下几个方面:

(1) 提高大型、精密、复杂、长寿命模具的设计水平及比例。这是由于塑料模成型的制品日渐大型化、复杂化和高精度要求以及因高生产率要求而发展的一模多腔所致。

(2) 在塑料模设计制造中全面推广应用CAD/CAM/CAE技术。CAD/CAM技术已发展成为一项比较成熟的共性技术,近年来模具CAD/CAM技术的硬件与软件价格已降低到中小企业普遍可以接受的程度,为其进一步普及创造良好的条件;基于网络的CAD/CAM/CAE一体化系统结构初见端倪,其将解决传统混合型CAD/CAM系统无法满足实际生产过程分工协作要求的问题;CAD/CAM软件的智能化程度将逐步提高;塑料制件及模具的3D设计与成型过程的3D分析将在我国塑料模具工业中发挥越来越重要的作用。

(3) 推广应用热流道技术、气辅注射成型技术和高压注射成型技术。采用热流道技术的模具可提高制件的生产率和质量,并能大幅度节省塑料制件的原材料和节约能源,所以广泛应用这项技术是塑料模具的一大变革。制订热流道元器件的国家标准,积极生产价廉高质量的元器件,是发展热流道模具的关键。气体辅助注射成型可在保证产品质量的前提下,大幅度降低成本。目前在汽车和家电行业中正逐步推广使用。气体辅助注射成型比传统的普通注射工艺有更多的工艺参数需要确定和控制,而且常用于较复杂的大型制品,模具设计和控制的难度较大,因此,开发气体辅助成型流动分析软件,显得十分重要。另一方面为了确保塑料件精度,继续研究开发高压注射成型工艺与模具也非常重要。

    (4) 开发新的成型工艺和快速经济模具。以适应多品种少批量的生产方式。

(5) 提高塑料模标准化水平和标准件的使用率。我国模具标准件水平和模具标准化程度仍较低,与国外差距甚大,在一定程度上制约着我国模具工业的发展,为提高模具质量和降低模具制造成本,模具标准件的应用要大力推广。为此,首先要制订统一的国家标准,并严格按标准生产;其次要逐步形成规模生产,提高商品化程度、提高标准件质量、降低成本;再次是要进一步增加标准件的规格品种。

?(6) 应用优质材料和先进的表面处理技术对于提高模具寿命和质量显得十分必要。

??    (7) 研究和应用模具的高速测量技术与逆向工程。采用三坐标测量仪或三坐标扫描仪实现逆向工程是塑料模CAD/CAM的关键技术之一。研究和应用多样、调整、廉价的检测设备是实现逆向工程的必要前提。


内容简介:
Pertanika J. Sci. this is because almost 70% of the plastic product shapes are similar, sochangeable inserts are used in this case. Core insert will be as permanent insert andchange the slider and cavity insert for T G Clip version and T G Stick version. Plate 11shows the cavity and core insert for T G Clip and Stick version.PertanikaJ. Sci. & Techno. Supplement Vo. 12 0.2,2004 93Wong, C.T., Shamsuddin Sulaiman, Napsiah Ismail & A.M.S. HamoudaCavity insertfor TNG stickPlate 11: Cavity, cure and slider insertMould Base SizeFor this project, three-plate type system mould base is used with pinpoint gating. Thesizes for the mould base are 250 mm x 250 mIll with FCI type, A-plate size 100 mm, B plate size 70 mm, Spacer block size 100 mm and with striper plate (referred from LKM(Lung Kee Metal) mould base handbook). The function of the stripper plate is toremove the runner from the plastic part and the plastic part will be considered a goodproduct with no need to touch up.For this mould base just one cavity will be injecting each time, the molten materialof plastic will flow through sprue to the cavity. After cooling, the plastic parts will hardenand stick to the core and then be ejected by using the shoulder-type ejector pin.Three Plate MouldThree plate moulds are used in this project because the gating point to inject the moltenplastic is small and the runner system for a three-plate mould sits on a second partingplane parallel to the main parting plane. This second parting plane allows the runnersand sprue to be ejected when the mould is open. In this three-plate mould, the runnerswill be ejected separately from the cavities and the plastic part after injection does notneed to go through any touch up process (Rosato 1986).Slider CoreSlider core is used when the plastic parts are design undercut for example, side hole,side boss, etc. Slider core is stationary attached to plate B (refer to Plate 14) and twoangular pins are attached to plate A. When the mould opens, the angular pin will movethe slide core horizontally out from the mould position. The amount of the slide coremovement will depend on the angle and how far the slider moves on the angular pin.By the time the mould is opened, the slide core has moved enough so that the ejectorpin has been fully withdrawn from the plastic part.Cooling System (Water Channel)A water channel is to control the temperature of the mould surface and to chill up themolten plastic material to become rigid states that eject from the core side. For this94 PertanikaJ. Sci. & Technol. Supplement Vol. 12 No.2, 2004Design and Simulation of Plastic Injection Moulding Processproject the water channels are designed to be drilled along the length of cavities, coreand slider. The cooling system is vertically to the mould. Plate 12 shows the flow of thewater channel in the mould insert.Plate 12: Water channel flow inside mould insertGating SystemThe gate is the connection between the runner system and the moulded part. It mustpermit enough material to flow into the mould to fill out the part plus additionalmaterial as is required to overcome the normal thermal shrinkage of the part. In thisproject, pin point gates are used, when the mould is open the part will automatically beremoved from the runner and there is no need to touch up for the plastic product. Plate13 shows the pinpoint gate system.Plate 13: Pin point gate systemComplete Mould AssemblyPlate 14 shows the completed mould assembly for TNG Clip Version. Plates 15 and 16show the cross-section for mould close assembly and open assembly position.CAD/CAM for Mould DesignIn the plastic industry, CAD/CAM has emerged to the point where it now shows thepromise of being one of the most significant technological advances of the century.PertanikaJ. Sci. & Techno!. SupplementVo!. 12 No.2, 2004 95Wong, CT., Shamsuddin Sulaiman, Napsiah Ismail & AM.S. HamoudaPlate 14: Completed mould assemblyPlate 15: Cross-section mould close assemblyCAD/CAM is enabling the creative energies of plastic part and mould designers to bespent in producing better designs in a shorter time period rather than in doingrepetitive mould design tasks.The Advantages of CAD/CAMThe advantages of the CAD/CAM in mould design are:a) CAD/CAM technologies are normally used for the numerically controlled ( C)machining technology to fabrication for the moulds and also its ability to createthree-dfmensional product models in the data base and to generate automatically.96 PertanikaJ. Sci. & Techno. Supplement Vo. 12 No.2, 2004Design and Simulation of Plastic Injection Moulding ProcessWong, C. T., Shamsuddin Sulaiman, Napsiah Ismail & A.M.S. HamoudaDepartment of Mechanical and Manufacturing EngineeringUniversiti Putra Malaysia, 43400 UPM, Serdang, Selangor, MalaysiaABSTRACfThis paper presents the design of plastic injection mould for producing a plastic product.The plastic part was designed into two different types of product, but in the same usage(n.使用) function. One part is using clip(vi.修剪,引申为凹模) function and another part is using stick function. In the computer-aided design (CAD), two plastic parts were drawn in 3 dimension (3D) view by using Pro-Engineer (Pro-E) parametric(ad j.参数的) software(n.软件). In the computer-aided manufacturing (CAM), Pro-Manufacturing from Pro-E parametric software was used to develop the machining program. For mould design, the product was designed into two changeable(adj.可变的) inserts (n.嵌入物)to produce two different types of plastic product in one mould base(模架). Before proceeding (n. 进行,进程)to injection(n. 注射) machine and mould design, this part was analysed and simulated(v.模拟) by using Mold Flow or Part Advisor software. From the analysis and simulation(n. 模拟) we can define(vi. (给词、短语等)下定义,构成释义) the most suitable injection location(n. 位置), material temperature and pressure for injection. The predicted weld lines and air trap were also found and analysed.Keywords: Changeable insert mould, injection pressure, air traps, injection location,mould designINTRODUCTIONNowadays, the technology of the tool and die fabrication (模具制造)in plastic injection is one of the worlds fastest growing industries. Plastic is now used in almost every application,ranging from household articles to space travel, from transportation to packing, from medicine to toys, from bridge building to sports. Generally, injection moulding is a process that forms the plastic into a desired(adj. 渴望的,想得到的) shape by melting(adj. 熔化的;融化的) the plastic material and forcing the plastic material under pressure into the mould cavity(铸型腔). The shape of the plastic that is desired is achieved by cooling in thermoplastic or by chemical reaction for thermosetting(adj. 热硬化性的;热固).Mould design and fabrication is a costly and high technology process because it uses science-based computer-aided engineering (CAE) software to analyse and simulate the plastic parts, computer-aided design (CAD) software to design the complicated (adj. 结构复杂的)plastic product and computer-aided (计算机辅助的) manufacturing (CAM) to do the programming fabricationto run the computer numeric control (CNC) for milling or latch. Advances in computer technology have led to an increasingly (adv. 越来越多地)favorable (adj. 有利的)power to cost ratio (n. 比,比率)for computers. So this advantageous and costly technology will improve productivity and process consistency(n.前后一致).Thus, for this fast growing industry, new technologies are vital(adj. 至关重要的) to ensure that this technology reaches perfection. S.o computer-aided engineering (CAE) is the assistant (adj.辅助的)to process and calculate(vt. 预测,推测 ) the plastic material flow inside the injection moulding.TheoryHow Plastic Fills a MouldThe injection moulding process can be broken into three phases:1. Filling phase(n.阶段)2. Pressurization(n. 增压) phase3. Compensating(n. 补偿) phaseFilling PhaseWhen designing plastic parts for the injection moulding process, the important element (n. 要素)to understand is how the plastic is filling in the mould. In the mould injection filling phase, molten plastic is injected into the cavity until the cavity is just filled. As plastic flows into the cavity, the plastic in contact with the mould wall quickly freezes (v.冻结,凝固)and this will create a frozen layer (n. 层)of plastic between the mould and the molten plastic.Plate 1 shows how the flow front expands as material from behind is pushed forward. The edge of the flow front comes into contact with the mould and freezes. The molecules(n. 分子) in the frozen layer are therefore not highly orientated(高度取向), and once frozen, the orientation(n. 方向) will not change.The red arrows(n. 箭头 ) show the flow direction of the molten plastic. The dark blue layers against the mould walls show the layers of frozen plastic. The green arrows indicate(vt. 表明) the direction of heat flow from the polymer (n. 多聚物;高分子 聚合物)melt into the mould walls.The frozen layer gains(v. 获得) heat as more molten plastic flows through the cavity, and loses heat to the mould. When the frozen layer reaches a certain thickness, equilibrium is reached. This normally happens early in the injection moulding process, after a few tenths of a second.Pressurization PhaseThe pressurization phase will happen after the filling phase completely fills the cavity area. At this stage, all the flow paths will be filled up by molten plastic, the edges and corners of the filling area in the cavity may not contain plastic. To completely fill outthe geometry(n. 几何形状), extra (adj. 额外的)plastic is pushed into the cavity during the pressurization phase.Plate 2 shows the difference between the end of the filling phase (left image) and the end of the pressurization phase (right image).Notice the unfilled corners (inside the blue circles) that are left at the end of the filling phase. The yellow cone indicates the polymer injection location and the plastic is red.Compensating PhasePlastic material has a high volumetric shrinkage(体积收缩量), form the melting plastic to solid, it will shrinkage average of 25%. Therefore after the pressurization phase, more material must be injected into the cavity to compensate for the plastic shrinking after it cools. This is the compensating phase(相位补偿) (MoldFlow Help Files).Mould Basic ConstructionMould design and mould making can be considered the most critical processes of the injection(n. 注射) moulding system. This is because the mould design and mould making have tremendous (adj. 巨大的)impact (n. 影响)on productivity(n. 生产率) and product quality. Basically, the function of the mould is two fold. The first is imparting(v. 通知) the desired shape to the plasticized polymer, the second is cooling the injection moulded parts. The mould, which contains one or more cavities, consists of two basic parts: A stationary(adj. 固定的) mould half on the side where the plastic is injected A moving half on the closing or ejector side. The separation (n. 分离)of the two moulds is called the parting line.The mould will determine the final product properties(n. 特性) such as size, shape, dimension (n. 尺寸)and finishing surface(加工表面). Usually, the melted plastic material is filled through the central feed channel (n. 渠道)called sprue (n. 铸道)to the cavity. The mould will coincide with the injection machine cylinder nozzle.( 缸喷嘴) Table 1 is the summary list for mould component and the function respectively(adv. 各自地).Mould DesignTo start up a new mould design, the designer should know some important points to avoid some mistakes before going further Le. product outlook design, material usage(材料的使用),correct shrinkage of the material, number of cavities and selection of the mould base. Making a mistake can cause an ill-fitting(adj. 不合的) mould at the final assembly(n. 装配) and also make the plastic product out of tolerance (n.公差)and be rejected by the customer. Fig. 1 shows the mould designers charMoldflow software. Plate 5 shows the solid model (实体模型)with gate location placing(浇口位置) on top of the model. The yellow colour cone shape shows the iection location in this analysis.In injection and transfer moulding(自动成型) , the gate is considered the portion of the moulded piece (铸造零件)that allows the molten resin to flow the runner or from the sprue into the cavity. The gate may be the same size and shape as the runner, but generally it is much smaller. There is an optimum(adj. 最适宜的)gate size. It should be large enough for suitable fill rate and small enough to seal off and prevent backflow or overpacking.Product Simulation ResultBefore starting the simulation process, some information has to be set up, such as material supplier (材料供应商)and material grade(材料规格) . This is normally already set in the Moldflow database and the user just selects the specific material specification(n. 规格). Table 2 shows the element used.for this analysis:Material Grade:材料牌号Mould Temperature:模具温度Melt Temperature:熔体温度Max Injection Pressure:最大注射压力Fill TimeFill time is the time taken to fill up the part inside the cavity, it is also to show how the plastic material flows to fill the mould. From that we know that the short shot (part of the model which did not fill) part will be displayed. From that result one can also understand how the weld line and air trap will form. Plate 6 shows the material fillinginto the mould.Confidence of FillThe confidence of fill result displays the probability of the region(n. 地区) within the cavity with plastic. This result is derived from the pressure and temperature results. The confidence of fill will display in three colours: green, yellow, red and translucent(ad j.半透明的). Showing in green will definitely fill, in yellow may be difficult to fill or may have quality problem, in red will be difficult to fill or will have quality problem and in translucent will not fill (short shot).If the cavity does not fill, some changes must be made to either design, gate location, choice of plastic or processing conditions. However, to ensure the finished part is of good quality, the cavity must also be adequately(adv. 足够地) packed with plastic. Plate 7 shows confidence of fill in this analysis.Injection PressureThe colour at each place on the model represents the pressure at the place on the model. Two colours show the highest pressure (red) and lowest pressure (blue). The injection pressure can be used in conjunction(n. 结合物) with pressure drop result. For example,even if a section of a part has an acceptable pressure drop, the actual injection pressure in the same area may be too high. High injection can cause overpacking(超紧密堆积作用).To reduce the chance of this happening, follow these steps:1. Increase the maximum injection pressure第 1 页 共 10 页塑料注射成型过程的设计与仿真机械与制造工程特拉马来西亚,43400 UPM,Serdang,雪兰莪、 马来西亚本文介绍了用于生产塑料产品的注塑模具的设计。把塑料模设计成两种不同的部分,但是拥有相同的使用功能,其中一部分是凹模功能,另一部分则是凸模功能。在计算机辅助设计 (CAD)中,两个塑料零部件使用 Pro-Engineer (Pro E) 参数化软件绘出 3 维(3D)视图。在计算机辅助制造 (CAM)过程中,亦可利用 Pro-E 参数化软件开发加工程序,同时对于模具设计而言,在同一模架上,可利用可变的镶块生产出不同种类的塑料产品。在操作注塑机和模具设计之前,利用 Mold Flow 或 Part Advisor 软件,我们可以分析和模拟出最合适的注射部位、物质的温度和注射压力,预测出熔接横和气泡的位置。.关键字: 多变插入模具、注射压力、气泡,注射位置、模具设计简介当今,工具和模具制造的塑料注射成型技术是世界上增长最快的行业之一。现在几乎每个应用都涉及到了塑料产品,从生活用品到太空旅行,从运输到包装,从医学到玩具,从桥梁建设到体育运动,无不使用塑料产品。通常塑料注射成型是熔化的塑料材料在压力作用下进入到模腔,在冷却或化学反应的热固性下实现所需形状的过程。模具的设计与制造是一个高昂的消费和高科技投入的过程,因为它使用以科学为基础的计算机辅助工程 (CAE) 软件来分析和模拟塑件部分,其中计算机辅助设计 (CAD) 软件设计的复杂的塑料产品和计算机辅助制造 (CAM) 为铣削或闩锁编制的所要运行的计算机数字控制 (CNC)程序。随着计算机技术的进步,导致了计算机的成本被人忽略,所以这种先进和昂贵技术将会提高生产力和改善工艺性。因此,对于这个快速发展的新兴行业来说,确保新技术达到完善是很重要的。因此计算机辅助工程 (CAE) 是协助处理和计算注塑材料在注塑模内部的流动情况。理论如何注塑材料如何填充模具第 2 页 共 10 页注射成型过程可以画分为三个阶段:1.灌装阶段 2.加压阶段 3.补偿阶段(1)灌装阶段设计塑料零件的注射成型过程时,最需要掌握的是如何使塑料填充到模具中。在模具注射填充阶段,熔融状态下的塑料注入型腔内直到腔内填满为止。随着塑料流入腔内,塑料与模具内壁接触迅速凝固,进而在模具内壁和融化的塑料之间产生凝固层板 1 显示塑料材料如何从后往前的扩展和流动,在流动的前沿与模具接触后凝固。冷冻层中的分子因此没有高度的导向,一旦被凝固,方向不会改变。板 1:板 1 塑料在模具内部的流动红色箭头显示熔化了的塑料的流动方向,模具中暗蓝色的层则显示塑料的凝固层。绿色箭头表示模具内的热量沿聚合物熔体的流动方向。融化状态下的塑料在经过凝固层吸收部分热量后,填充到模具内。当冷冻层达到一定厚度时,腔内出现平衡,这通常发生在注塑过程早期的十几秒后。(2)加压阶段在灌装阶段完全填充型腔后,进入加压阶段。在此阶段,所有路径将都被融化的塑料所填充,但是腔内填充区域的边缘和角落可能没有填充到。为了实现完全填充,在加压阶段需要向模具内注入额外的塑料。板 2 显示灌装阶段 (左图) 的结束和加压阶段 (右图像) 结束之间的差异。注意未填充的角(蓝色的圆圈) ,将一直保留到灌装阶段的结束。黄色的圆锥指示聚合物注射位置,塑料是红色的。第 3 页 共 10 页板 2 填充和加压阶段的差别FillinR Phase:填充阶段Pressurization Phase:加压阶段(3)补偿阶段塑料材料具有较高的体积收缩率,塑料从熔融状态到固体,它的收缩率平均为 25%。因此加压阶段之后,必须将更多的材料注入腔来弥补收缩后凝固的塑料,这是补偿性阶段 。模具基础制造模具设计和制造是注塑系统最重要的过程。这是因为模具的设计与制造对于生产效率和产品质量有着巨大的影响。基本上模具具有两个功能。第一使聚合物形成所需的形状;第二冷却注塑成型零件。模具,包含一个或多个腔,由两个基本部分组成:注入塑料的固定模具 关闭或者喷射的一面,分离的两个模具是称为分型线模具将决定产品的最终属性,如大小、 形状、 尺寸和加工表面。通常情况下,模具配合注射机缸喷嘴将融化的塑料材料填充到型腔称为浇口到腔。表1 分别是模具组件和功能的摘要列表。模具设计要启动一个新的模具设计,在产品的外观设计、材料使用、 材料、 型腔的数目正确收缩和模具基地的选择等做进一步设计之前,设计者应该了解一些重要点,以避免产生一些错误,另外犯了错误可以导致不合格的模具,在最终的装配,以及制作出来的塑料产品超出了公差而被客户所拒绝。模流分析软件 5 板显示实体模型的浇口位置在模具的顶部,黄色圆锥形状显示在此分析中的位置。第 4 页 共 10 页在注射和自动成型过程中,浇口作为铸造零件的一部分,允许熔融状态下的材料流动,从注入口到模腔,浇口一般都是相同的大小和形状,但通常是要小得多。最合适的浇口,对于填充率应该足够大,对于密封和防止回流应该尽可能小。产品模拟结果在模拟过程开始之前,材料供应商和材料牌号必须设置和选择,通常情况下,在模中设计数据库中已有数据,用户只须根据需求选择具体材料规格。下图显示了材料这一分析:Material Grade:材料牌号Mould Temperature:模具温度Melt Temperature:熔体温度Max Injection Pressure:最大注射压力填充的时间填充时间是填满腔内部分所需的时间,它也是显示了塑料材料如何填充模具的流动,从这点我们也可以了解到短时间内部分不被填充的的模型部分,从这一结果也可以了解到熔接横和气泡的产生。6 板显示材料填充入模具的情况第 5 页 共 10 页(材料百分之百填充模具)填充的程度填充程度的结果显示该区域与腔内的空隙。这一结果是由压力和温度所致的结果。填充程度会显示三种颜色: 绿色、 黄色、 红色和半透明。绿色显示肯定会填充、 黄色表示可能很难填补或可能有质量问题,红色将是很难填补或将有质量问题,半透明则表示不会填充。如果未能填充型腔,可能是设计浇口位置的原因,则必须进一步的更改塑料或工艺条件的选择。然而,要确保已完成的部分是质量好,腔内还必须充分地装入塑料。7 板显示在此分析中填充的程度。第 6 页 共 10 页注射压力模型的每点上的颜色上表示模型上该点的压力,红色显示为最高压力,绿色则表示最低压力。而一点的压力则是注射压力和压力降结合的结果。例如,即使某一部分具有可接受的压降,实际注射压力在同一地区可能太高,高注射可引起超紧密堆积作用,为了减少这种情况发生的可能,请按照下列步骤:1.增加最大注射压力 2.改变聚合物注射位置 3.改变零件形状 4.选择不同的材料板 8 是从 0 MPa 至 47.02MPa 注射压力的显示结果气泡10 板分析后显示产生气泡结果,显示小蓝色表示气泡的分布情况。分析结果显
温馨提示:
1: 本站所有资源如无特殊说明,都需要本地电脑安装OFFICE2007和PDF阅读器。图纸软件为CAD,CAXA,PROE,UG,SolidWorks等.压缩文件请下载最新的WinRAR软件解压。
2: 本站的文档不包含任何第三方提供的附件图纸等,如果需要附件,请联系上传者。文件的所有权益归上传用户所有。
3.本站RAR压缩包中若带图纸,网页内容里面会有图纸预览,若没有图纸预览就没有图纸。
4. 未经权益所有人同意不得将文件中的内容挪作商业或盈利用途。
5. 人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对用户上传分享的文档内容本身不做任何修改或编辑,并不能对任何下载内容负责。
6. 下载文件中如有侵权或不适当内容,请与我们联系,我们立即纠正。
7. 本站不保证下载资源的准确性、安全性和完整性, 同时也不承担用户因使用这些下载资源对自己和他人造成任何形式的伤害或损失。
提示  人人文库网所有资源均是用户自行上传分享,仅供网友学习交流,未经上传用户书面授权,请勿作他用。
关于本文
本文标题:显示器支架扣件塑料注射模具设计【14张CAD图纸和说明书】
链接地址:https://www.renrendoc.com/p-10118838.html

官方联系方式

2:不支持迅雷下载,请使用浏览器下载   
3:不支持QQ浏览器下载,请用其他浏览器   
4:下载后的文档和图纸-无水印   
5:文档经过压缩,下载后原文更清晰   
关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

网站客服QQ:2881952447     

copyright@ 2020-2024  renrendoc.com 人人文库版权所有   联系电话:400-852-1180

备案号:蜀ICP备2022000484号-2       经营许可证: 川B2-20220663       公网安备川公网安备: 51019002004831号

本站为文档C2C交易模式,即用户上传的文档直接被用户下载,本站只是中间服务平台,本站所有文档下载所得的收益归上传人(含作者)所有。人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。若文档所含内容侵犯了您的版权或隐私,请立即通知人人文库网,我们立即给予删除!