Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
A riser or a feeder head is a passage of sand made in the cope to permit the molten metal to rise above the highest point in the casting after the mould cavity is filled up. Risers serve a dual function. They compensate for solidification shrinkage which is a very common casting defect and are a heaf source so that they freeze last and promote directional solidification.
Types of Risers : There are two types risers :Top or open risers and side or blind risers.
Riser shape and Size : The metal in the riser should remain in the molten state for a longer time than in the mould cavity.
It means a heaf looses in riser should therefore be kept to a minimum. It means a riser most freeze more slowly than the casting. Those there shape should be such as to give volume-to-surface-area ratio a maximum value. This ratio is maximum for a sphere. Therefore this is the ideal shape of a riser.
As regards the height of the riser, it must be fall enough to ensure that any pipe formed in it does not penetrate the casting.
1. A very narrow laser beam in air is shone into a sphere of solid glass that has a uniform refractive index n>1 and radius ? . The beam makes an angle a in air with the normal to
Presintering is an operation in which the powder metallurgy components after compaction are heated for a short time to a temperature considerably below the final sintering tempera
PRESSURE RELIEF VALVE The pressure relief valve shown in the figure. controls the oil pressure at the pre-set value demanded by the system. The valve is normally integral with
First page rankings on Google We can put your website on 1st page of Google to drive relevant traffic to your site. Let us know if you would be interested in getting detailed prop
Exhaust Section Inspection. Inspection of the exhaust section of the engine can be done visually using an appropriate light source. The exhaust cone and jet pipe are examined
Control Surface Effectiveness and Reversal To discuss the effectiveness and loss of a control surface, we allow a rigid rotation δ of the flap set by a flight control system (o
Blanking involves cutting of the sheet metal along a closed outline in a single step to separate the piece from the surrounding stock. As shown in figure, the path that is cut out
A company issues 15-year, $1,000 par-value bonds, with a coupon rate of 5%. The bonds are sold for $619.70. The tax rate is 30%. Compute the cost of debt before taxes and after tax
NAND Gate; When constructing a NAND gate using transistors as the switching devices, the output often represents the 'inversion' of the "AND" gate. Figure 4 shows an example o
Representations of a linear system The linear system of Section is shown in block diagram To determine the responseof the output of the system y(t) to an input u(t) the initial
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd