Showing posts from April, 2014

Vacuum Molding

Expandable mold vacuum molding is one which uses vacuum pressure to mold around the metal plate pattern. This process was invented by the Japanese in 1970. Steps involves in vacuum molding Step 1 Pattern is made from the metal and have specifically design hole in them to withdraw air to create the pressure. A preheated thin plastic sheet is placed over the patter and held tightly with metal plate because of the vacuum. Step 2 A special design bucket is placed over the pattern and filled with the sand. All other things like spur, runner, riser etc are made.  Step 3 A plastic sheet is placed over the sand and vacuum is created to held the sand tightly together and so the sand take the shape of the pattern Step 4  Vacuum is released and bucket is lifted above the pattern  Step 5 Other part of the mold is made is the same way and they attached together to get the one complete mold. Then a hot molten metal is poured into the mold to get the required out

Difference Between Izod and Charpy Test

There are two types of test use for testing the Impact resistance of any material one is Izod  Impact resistance  test and other is Charpy  Impact resistance  test . Both of them use the same principle to test the  Impact resistance  of any material but still there are may difference in them and our today's article will show these difference between Izod and Charpy  Impact  testing  Izod vs Charpy Specimen Position Position of specimen is both the experiment is different from each. In the Izod method, the test material was placed in a vertical position, while in the Charpy method, the test material was placed horizontally. Point of Strike  Point at which the hammer strike the specimen is different for both of them. In Izod test hammer strike at the upper tip of specimen while in Charpy test hammer strike at point of notch but in opposite direction  Direction of Notch Face of specimen which faces the striker is different. The notch face in the izod

Permanent Mold Casting Processes

Permanent Mold Casting Processes are one in which there is a one mold made of metal which could be used again and again many times. Mold material is usually cast iron or steel. Mold is usually consist of two parts, which are attached to each other and metal is poured and when metal cools, mold is opened and part is removed Basic Permanent Mold Casting Processes Die casting Hot chamber die casting Cold chamber die casting Centrifugal casting True centrifugal casting Semi centrifugal casting Pressure casting Vacuum molding casting Slush casting Ingot manufacturing Steps involves in Permanent Mold Casting Processes Step 1 Two parts of the mold are heated and are spared with some material which prevent the molting material from sticking with mold walls. Step 2 If there is any internal cavity core is place in the mold and mold is closed Step 3 After the mold is closed molten metal is poured into the mold. Step 4 When the molten

Different Types Of HOLE In Pro E

In Pro/ENGINEER holes are created using the HOLE dialog box. The HOLE dialog box is displayed when you choose Insert > Hole from the menu bar or PART > Feature > Create > Solid > Hole from the Menu Manager. You can create three types of holes using the HOLE dialog box. The first type is a straight hole, the second is a sketched hole, the third is a standard hole.           straight hole Straight holes are the holes that have a circular cross-section having a constant diameter throughout the depth. They start at the placement plane and terminate at the user-defined depth or at the specified end surface. sketched hole The Sketched option allows you to sketch the cross-section for the hole that is revolved about a center axis. This option is used to draw custom shapes for the hole. When you choose this radio button in the HOLE dialog box, the system opens a new window with the sketcher environment. The cross-section for the hole is sketch

Introduction To Manufacturing

Manufacture is derived from two Latin words manus  (hand) and factus (make); the combination means  “made by hand”.  “Made by hand”accurately described the manual  methods used when the English word “manufacture”  was first coined around 1567 A.D.  Most modern manufacturing is accomplished by  automated and computer-controlled machinery that is  manually supervised Introduction Manufacturing is the application of physical and  chemical processes to alter the geometry, properties,  and/or appearance of a given starting material to  make parts or products; manufacturing also includes  assembly of multiple parts to make products  Manufacturing is almost always carried out as a  sequence of operations Manufacturing is the  transformation  of   materials into  items of greater value by means of one or more  processing and/or assembly operations  Manufacturing adds value to the material by  changing its shape or properties, or by combining it  with other materials that hav

Plaster Mold Casting

Plaster mold casting is just like the sand casting, the difference is that the plaster of Paris is used instead of sand in mold making. In p laster mold casting,  plaster of pairs is mixed with a fixed quantity of water to make a mixture which became rock solid in few minutes. Steps involves in Plaster mold casting Step 1 The first step is the making of the mixture. Plaster of paris is mixed with water or some other binder to make a thick mixture which become solid in few minutes Step 2 Pattern is made of wood usually and sprayed with the thin layer of parting component in order to prevent the sticking of mixture with pattern Step 3 Mixture is then poured onto the pattern and make sure that the pattern is completely  covered with mixture. Step 4  After the plaster is set. Patter is removed from the solid plaster Step 5 Mold is not yet perfectly dry that’s why it is heated at 120 C to remove the excess water Step 6 All the pieces of the mold are assembled and preheate

Expanded Polystyrene Process

Expanded Polystyrene Process is one which uses the pattern made of polystyrene. Polystyrene is melted away when hot molten metal is poured in it Steps involves in the Expanded Polystyrene Process Step 1 A pattern is made from the polystyrene and then refractory material is sprayed on it  Step 2 Pattern is then placed in a box and sand in compact around the pattern for the support Step 3 Hot molten metal is then poured into the pattern through the sprue. As the metal moves down polystyrene is vaporized away and thus allow the metal to move further into the mold Advantages of Expanded Polystyrene Process No need to remove the patter Easy to make the mold Disadvantages Expanded Polystyrene Process New pattern have to made every time Expansive than other Take more time in mold making as new  mold is needed every time

Sand Casting


Top 7 Difference Between Inward Flow and Outward Flow Reaction Hydro Turbine

To know the difference between the inward flow and outward flow reaction hydro turbines we will compare them on the following points  1. Energy of water  2. Centrifugal head imparted  3. Discharge  4. Discharge  5. Wheel tendency to race  6. Suitability  7. Application  To learn the difference between different turbine type read our article  Frances Turbine vs Kaplan Turbine Difference between inward flow and outward flow reaction hydro turbine  Energy of water In Inward flow reaction hydro turbine water enters at the outer periphery, flows inward and toward the center of the turbine, and discharges at the outer periphery where as in   outward flow reaction hydro turbine water enters at the inner periphery flows outward, and discharges at the outer periphery  Centrifugal head imparted In the Inward flow reaction hydro turbine negative centrifugal head reduces the relative velocity of water at the outlet whereas in the  outward flow reaction hydro turbine positive Centrifugal head inc