To remove the product from the mold, the mold Should Be moved to open the form in the which the movement is a return of the plate and other parts of the mold is Carried by the backward motion of the moving plate. Backward movement or opening Should Be synchronous is imultaneously or sequentially with movements also That other parts of the mold so That the product apart and fell out of the mold.
At the time the mold opens, the supporters in terms of weight,mold is Divided into two parts That come the moving plate (cavity) and the part the which joined the fixed plate (core).
In general, the moving mold plate to function as participating forming the inner product, where in this section are the components or the driving mechanism of the release of the product. Currently participating fix the mold plate is Generally sebagain forming the outer product, and will of Those parts have sprue and runner system.
The Engineering Design Process
Engineering design is one of the processes normally associated with the entire business or enterprise. from receipt of the order or product idea. 10 maintenance of the product. and all stages in between (Figure 2.6). The design process requires input from such areas as customer needs.
materials. capital, energy. time requirements. and human knowledge and skills.
Two important societal concerns that an engineer must take into account are legal and environmelltal issues. Every business must operate within the law that governs their business. When designing. it is important that the engineer understand that legal issues may affect the designed product. Safety laws related to automobiles are an example of how government legislation can affect a design. Governmcnt regulations related to the cnvironment may also havc a bearing on the final outcome of the design. For cxamplc. the cmission requircments on an automobile cngine havc a great effect on the final design.
An cxample of human knowledgc input is an cngineer's knowledge of graphics. mathematics. and the sciences.
Such knowledge is used by the engineer to analyze and solve prohlems. An engineering design involves hoth a process and a product. A process is a series of continuous actions ending in a panicular result. A product is anything produced as a result of some process. As the design of a product or process is developed. the design team applies engineering principles, follows budgetary constraints. and takes into account legal and social issues. For example, when a building is designed. engineering principles arc used to analyze the structure for loads: determine the structure's cost. based on the materials 10 be used. the size of the
structure. and aesthetic considemtions; and create a design that adhcres to the local laws.
Graphics is an extremely important pan of the engineering design process. which uses graphics as a tool to visualize possible solutions and to document the design for communications purposes. Graphics or geometric modeling using CAD is used to visualize, analyze, d(X~ument. and produce a product or process. In fact. geometric modeling it,<;elf could be considere a process. geometric modeling produces final design solutions, as well as inputs to the production process, in the form of wrnputer databases. As a product. geometric modeling is a result of the engineering design process.
The Engineering Design ProcessBertoline-Wiebe-Miller:
Fundamentals of Graphics Communication,3/e
The McGraw-Hill Companies,2001
Sectional views
by Brian Griffiths
Publisher: Elsevier Science & Technology Books
Why are first and third angle projections so named?
The terms first angle projection and third angle projection may seem like complicated terms but the reason for their naming is connected with geometry. Figure 2.15 shows four angles given by the planes OA, OB, OC and OD. When a part is placed in any of the four quadrants, its outline can be projected onto any of the vertical or horizontal planes. These projections are produced by viewing the parts either from the right-hand side or from above as shown by the arrows in the diagram.
In first angle projection the arrows project the shape of the parts onto the planes OA and OB. When the two planes are opened up to 180 ~ as shown in the small diagrams in Figure 2.15, the two views will be in first angle projection arrangement. When the part in the third quadrant is viewed from the righthand side and from above, the view will be projected forwards onto the faces OC and OD. When the planes are opened up to 180 ~ the views will be in third angle projection arrangement, as shown in thesmall diagrams in Figure 2.15.
If parts were to be placed in the second and fourth quadrant, the views projected onto the faces when opened out would be incoherent and invalid because they cannot be projected from one another. It is for this reason that there is no such thing as second angle projection or fourth angle projection. There are several ISO standards dealing with views in first and third angle projection. These standards are" ISO 128"1982, ISO
128-30:2001 and ISO 128-34:2001.
Engineering Drawing for Manufacture
by Brian Griffiths
Publisher: Elsevier Science & Technology Books
Engineering Drawing for Manufacture
by Brian Griffiths
Publisher: Elsevier Science & Technology Books
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