What is injection moulding, Mechanical Engineering

Assignment Help:

Q. What is Injection moulding?

An important industrial method of producing articles of thermoplastics is injection moulding. The moulding material is loaded into a hopper from which it is transferred to a heating section by a feeding device, where the temperature is raised to

150 c to 370 c. and pressure is built up. The material melts and is forced by an injection ram at high pressure through a nozzle and sprue into a closed mould which forms the parts. The mould is in at least two sections, so that it may be spilt in order to eject the finished component. For the process to be competitive the mould must be fairly cool and consequently the mold must be cooled by circulating water. Injection moulding machines have a high production capacity: some can produce from 12 to 16 thousand parts per shift. This method is suitable for making parts within complex threads and intricate shapes, thin-walled parts etc.

The limitation of the process is:- Equipment of cylinder and die should be non- corrosive. Also, reliable temperature controls are essential. Injection moulding machines range in size from an injection capacity of 12,000 mm3 to 2,200,000 mm3. The locking forces are applied to be the mould usually by hydraulic means, and may vary from 0.1 MN to 8.0 MN or even more. The injection pressure may range from 100 MPa to 150 MPa.


Related Discussions:- What is injection moulding

Explain Functions of springs as on following points, 1. store energy 2. app...

1. store energy 2. apply force on a body 3. balance force between two bodies 4. absorb vibrations of body

Physics, difference brtween parallel and unlike parallel forces

difference brtween parallel and unlike parallel forces

Lighting system , Lighting System :   The motorcycle lighting system consi...

Lighting System :   The motorcycle lighting system consists of head light, turn indicators, brake lights and panel board lights. Figure shows a DC circuit of the electrical system

Direct current, Direct Current ( DC ) :  The direct current flows through...

Direct Current ( DC ) :  The direct current flows through a wire in one direction and it remains same over time. The current from battery is always direct current. Direc

How can you test hardness of the prepared mould, Q. How can you test hardne...

Q. How can you test hardness of the prepared mould? Hardness test: The hardness of the prepared mould surface is tested to check the ramming density of the sand. The instrume

Determine the maximum hoop - conical shells, Determine the maximum hoop: ...

Determine the maximum hoop: A conical water tank of height 2 metres & base radius 500 mm is supported at top and is full of water. The thickness of the wall is refer to 24 mm,

Explain hard or fixed automation, Explain Hard or Fixed Automation Mech...

Explain Hard or Fixed Automation Mechanical controls consist of numbers of mechanism that create the required relative motion to complete an activity. These mechanisms include:

Expression for the maximum shearing stress, Expression for the maximum shea...

Expression for the maximum shearing stress: Obtain expression for the maximum shearing stress and maximum shearing planes. Sol.: The condition for maximum shearing stress i

Flange assembly, The assembly techniques of bolted connections and bolts an...

The assembly techniques of bolted connections and bolts and gaskets material selection are closely interrelated. Consequently, they must be treated as an integrated problem.

Due diligent, Due Diligent:   There are many literatures on sand blast...

Due Diligent:   There are many literatures on sand blasting and manufacturing processes. Historically, sand blasting had been used for many tasks before. It was pretty famous

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

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!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd