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.
Permeability of Moulding Sand is the property of the sand, which permits the gases and steam to escape through the sand mould. For this purpose, the sand must be porous. Permeabil
Explain the formation of newton''s ring in reflected light. Prove that the radius of the bright rings are proportional to the square root of the positive odd interger
show that heat and work are path functons
Water is flowing at 0.5 ms-1 across a 7.5 cm diameter sausage at 80°C. If the bulk water temperature is 15°C, estimate the heat-transfer coefficient. a) What type of heat tranfe
Sulphuric acid can be made with concentration of 99%. However for different industrial process different concentrations are used. For a specific industrial requirement, 62% H2SO4
hi um how do people design phones and stuff like da
how to do a cash management project report ,including problems?example?
determine the ash content in given sample
design cage type poultry house for 1000 lying birds also specify the equipments for feeding,watering,lighting and protecting birds.
tabular method
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