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Injection moulding introduction
Injection moulding introduction
Injection molding research paper
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Analysis of the Stress Cone The stress cone is shown in Figure 3-6 Stress cone, which has a shape of a cone, is the traditional technique to control the stress at the electrical termination of cables. It brings the stress to a subtle stop. To eliminate fires or electric surges by the high concentration of flux between the conductor cable and shield termination, stress cone must be install properly on middle to high voltage (46kV or up) systems. For this particular experiment stress cone is being made of a silicone rubber to provide reliable insulation against different voltage ratings. Silicone rubber is a preferred material for cable accessories due to its excellent mechanical and electrical properties. According to the termination type, there are two methods to manufacture …show more content…
Relatively new injection molding (first machine was built in 1930s) is often used in mass-production and prototyping. 4.3.1 The Injection Mold Process Even though injection molding seems to have a quite simple process, in order to successfully manufacture a product involves more complex steps. However, before pre-dying, the color, particle size and uniformity of the silicone rubber should be checked, and also the moisture content should be less than 0.02% before forming. Mainly, there are four steps in injection molding process, which also called injection molding cycle. 1. Clamping Clamping unit is one of the three basic parts in injection molding machine. Main purpose of the hydraulically powered clamping unit is to keep the mold halves press closed during injection and cooling. Before pouring material into the machine hopper, the two mold halves (movable half and fixed half) must be firmly closed by clamping unit. According to the size of the machine, changes the required time for clamping. The time can be estimated from the dry cycle time of the
One term used in the manufacturing process is Rapid Prototyping (RP), which describes a process for rapidly creating a system or part representation before final release or commercialization. Although as the technologies have been developing, users have notice that this term does not effectively describe more recent applications of the technologies. The basic principle of these RP technologies is that they all fabricate parts using an additive approach; this is one of the reasons why recently adopted ASTM consensus standards now use the term Additive Manufacturing (AM) for these processes [2].
The second process of shaping ceramics is plastic forming. We have various methods of plastic forming such as extrusion, injection molding and jiggering. Plastic forming tends to orient the layered structure of clays along the direction of material flow.
For my first example, I am using motorcycle engines. The first motorcycle engines were steam powered but soon changed to internal combustion engines sourced from ditch-pumps and early aircraft engines all of which were produced in a similar manner. The casting and machining of the casings and cylinders was very primitive but effective. The cavity in the sand is formed by using a pattern (an approximate duplicate of the real part), which are typically made out of wood, sometimes metal. The cavity is contained in an aggregate housed in a box called the flask. Core is a sand shape inserted into the mould to produce the internal features of the part such as holes or internal passages. Cores are placed in the cavity to form holes of the desired shapes. Core print is the region added to the pattern, core, or mould that is used to locate and support the core within the mould. A riser is an extra void created in the mould to contain excessive molten material. The purpose of this is feed the molten metal to the mould cavity as the molten metal solidifies and shrinks, and thereby prevents voids in the main casting. In a two-part mould, which is typical of sand castings, the upper half, including the top half of the pattern, flask, and core is called cope and the lower half is called drag. The parting line or the parting surface is line or surface that separates the cope and drag. The drag is first filled partially with sand, and the core print, the cores, and the gating system are placed near the parting line. The cope is then assembled to the drag, and the sand is poured on the cope half, covering the pattern, core and the gating system. The sand is compacted by vibration and mechanical means. Next, the cope...
Replica molding is a process that transfers a pattern from a rigid or elastomeric mold into another material by using a liquid which gets solidified when it comes in contact with the mold. Replica molding can be broken down into three subfields namely microtransfer molding, micromolding in capillaries and UV-molding.
There are numerous factors which can affect dimensions of subsequent casts on repetitive pouring. These include the process of polymerization (7), temperature (1), and material used to fabricate the replica or working cast (1). Although, PVS impression materials have demonstrated superior dimensional stability when compared with other elastomeric materials due to no releasing any by-products (8), it had been reported that the dimensional accuracy of a material is time dependent. A material may be highly dimensionally accurate soon after its initial polymerization but less accurate after the storage for a period of time (9). On the other hand, PVS impression materials have chosen as the impression material in many clinical situations because they possess excellent physical properties and handling characteristics
The bending stress due to the torsion moment Mx is uniformly distributed along the circumferential direction and maximum at the outer surface of the pipe. The
One of the important aspects of designing any electrical system is to select an appropriate type and size of a cable. Too much small size of cable generates a lot of heat in a cable which will caused permanent damage to an insulation of a cable and using a too much large cable size means we are wasting our money on copper because copper is the costly material for cables. So we must have to select a cable that is neither of too small nor too large size. Further there are many types of cable like stranded cable, ACSR, PVC insulation etc. Cable sizing helps us to select an accurate size (i.e. cross sectional area) and type of cable required for a particular system.
Injection Molding is the process of forcing melted thermo plastic into a mold cavity. Once the plastic has cooled, the part can be ejected. The first injection molding machines were built in the 1930's.
In the case of the mould process, a quantity of the pulp is placed into a form, with a wire-mesh base (or other draining device), so that the fibres are left coated on the mesh and excess water can drain away. At this time, pressure may be applied to remove more water through a squeezing action. The paper may then be removed from the mould, wet or dry, and go on to further processing.
used to make products such as plastic lumber, toys, containers, carpet, fiber fill for jackets
Lugs connection, spring assemblies, and clamping connections are some examples of connection to be checked in this step. Indeed, the connection is needed to be just be tight enough but how is this connection judged? With different factors such as long-term stress, magnetization effects, vibration or room atmosphere, infrared thermography can be used to check for correct tightness of the connection To measure the temperature of the connection. According to NEC standards, temperature between 65oC -75oC is the allowable temperature of the system dependent to the size and rating of the conductor connected.
In this experiment, the casting process was not successfully done due to several experimental errors that lead to dimensional inaccuracies and formation of defects on the surface and sub-surface of the casted product. Some of the defects identified in the product include: inclusion, internal voids, irregular and rough surface, and shrinkage. For future experiments, it is highly recommended to: 1) use more simpler patterns and make sure the plaster of Paris has the appropriate viscosity before pouring into the pattern, 2) avoid mixing the polyester resin and hardener mixture vigorously to prevent formation of bubbles, 3) the use of laboratory gloves when applying petroleum jelly uniformly on the mold is highly recommended to lessen introduction of foreign objects on the mold, and lastly 4) carefully pour the right amount of polyester into the
Creating a casting is not difficult, however it does require a number of steps to make sure that it arrives properly. The initial step is to look for the exact geometry from the mold in order to possess the correct shape. For fundamental conforms, the cast is made from a double edged sword which are then attached together. Once the metal is put in to the mold, it fills all of the negative space and when it's solidifies, the maker has got the exact mold they wanted.
If you asked me about myself, I would respond without any doubt, “I am Victoria, a stress resistant person.” I think maintaining full control over your emotional response to life's complications plays an important role in the way your day is shaped, and that of others. Confidence in one's abilities and a clear mind gives way to more calculated decisions, rather than falling victim to a potentially hectic environment. According to Dr. Keith Horinouchi, “stress resistance” means “the body’s ability to handle everyday stresses, preferably through a healthy lifestyle.” Now, stress resistance is my motto, which always reminds me how I should react to any difficulties that I face on my life's path. However, I was not always this way. I would say that this is a skill that I have slowly developed over the course of my life. Stress resistance is what helps me in every difficult situation.