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1、 Lesson 7 Mold Cavities and CoresPPT模板下载： 行业PPT模板： 节日PPT模板： PPT素材下载： PPT图表下载： 优秀PPT下载： PPT教程： Word教程： Excel教程： 资料下载： PPT课件下载： 范文下载： 试卷下载： 教案下载： PPT论坛： TABLE OFCONTENT 1 Passage2 New Words and Expressions3 Notes4 Reading MaterialLesson 1 What is Dies and Molds1. Integer Cavity and Core Plates When th
2、e 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 mold plates, it is termed an integer cavity plate or integer core plate. This design is preferred for single-impression molds because of the strength, smaller size an
3、d lower cost characteristics. It is not used as much for multi-impression molds as there are other factors such as alignment which must be taken into consideration. 1整体式型腔和型芯板 当型腔或型芯由一块大的钢板或钢块加工而成，或者铸成一体，不需使用支撑件而形成一块模板时，就构成整体式型腔板或型芯板。这种设计因具有强度高，尺寸小和成本低的特性，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
4、必须考虑一些其他因素，例如模具的找正等。Lesson 1 What is Dies and Molds Of the many manufacturing processes available for preparing molds only two are normally used in this case. These are (a)a direct machining operation on a rough steel forging or blank using the conventional machine tools, or (b)the “precision” inves
5、tment 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 t
6、he direct machining method. The precision investment casting method usually utilizes a high-chrome steel.Lesson 1 What is Dies and Molds在众多模具制造的方法中，用于加工整体式型腔或型芯板的方法主要有两种：（a）使用传统机床对粗锻钢材坯料直接加工；（b）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的处理过程。通常，4.25%的镍铬钼合金钢（BS 970-835 M30）是生产整体式模板的指定材料，这采用直接的机加方式。精确的
7、熔模铸造常常用来加工高铬钢。 Note句中的using the conventional machine tools作后置定语修饰a direct machining operation, in which a master pattern is made of the cavity and core后置定语从句修饰the “precision” investment casting technique。2. Inserts Cavity and Core For molds containing intricate impressions and for multi-impression m
8、olds, 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-bolster assembly method is therefore used instead.Lesson 1 What is Dies an
9、d Molds2镶拼式型腔和型芯 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）加工顺序和操作过程将变地非常复杂，成本也高。因此镶拼式装配方式替代了整体式。 镶拼式型腔是用小钢块加工（装配）而成。加工后镶拼式型腔是用小钢块加工（装配）而成。加工后的小钢块作为镶件，形成公模（型芯）部分的称为型芯的小钢块作为镶件，形成公模（型芯）部分的称为型芯镶件，相反地，形成母模（型腔）部分的称为型腔镶件。镶件，相反地，形成母模（型腔）部分的称为型腔镶件。然后，把这些镶件牢固地安装在被称为垫板的孔中，垫然后，把这些镶件牢固地安装在被称为垫板的孔中，垫
10、板由实芯钢板或钢块加工而成。这些安装孔有的是由垫板由实芯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，有的是在垫板直接加工而成。在后板的局部凹陷形成，有的是在垫板直接加工而成。在后一种方式中，垫板后部还要增加一块模板，起加固作用，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。确保镶件安装到位。 The method consists in machining the impression out of small blocks of steel. These small blocks of steel are known, after machining, a
11、s 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 then inserted and securely fitted into holes in a substantial block or plate of steel called a bolster. These holes are either sunk part way or
12、 are machined right through the bolster plate. In the latter case there will be a plate fastened behind the bolster and this secures the insert in position.Lesson 1 What is Dies and Molds3整体式和镶拼式的优缺点整体式和镶拼式的优缺点 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、所需的是单腔模具还是多腔模具，以及模具的制造成本等。通常，一旦塑件的（形状、尺寸）等特性确定后，采用哪种形式的
13、型腔和型芯就已经确定了。 3. For and Against Integer and Insert-bolster Methods 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 mold is desired, the cost of makin
14、g the mold, etc. It can therefore be said that in general, once the characteristics of the mold required to do a particular job have been weighed up, the decision as to which design to adopt can be made. Lesson 1 What is Dies and Molds Some of these considerations have already been discussed under v
15、arious 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.Lesson 1 What is Dies and Molds 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
16、是，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，无论是简单还是复杂，整体式型腔是首选方式。这样，模具的强度高，尺寸小，成本低，而冷却系统的设计却比镶拼式模具的简单、方便。设计时需要常记于心的是，适当地使用镶件可以简化模具型腔的加工制造难度。 Unquestionably for single impression molds the integer design is to 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 cooling system than the insert-bolster design. It should be borne in mind that loca
