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

Angular speed of the cylinder, Angular speed of the cylinder: A cylind...

Angular speed of the cylinder: A cylinder of mass 70 kg rotates from rest in frictionless bearing under the action of a mass of 7.0 kg carried by a rope wrapped around the cyl

A solid sphere is rotating in free space, A solid sphere is rotating in fre...

A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same  which one of the following will not be affected? Solution) In free space, nei

Explain the welding process, All shell and head joints shall be double-weld...

All shell and head joints shall be double-welded butt joints with full penetration. In cases where double welding is impractical, the root pass shall be made by the GTAW process.

Wire feeding unit-co2 welding, WIRE FEEDING UNIT The wire electrodes ar...

WIRE FEEDING UNIT The wire electrodes are supplied as continues coils in wire spools. The solid wires are available in the following sizes 0.8, 1.0, 1.2, 1.6, 2.0 and 2.4 mm di

Determine the location of the hydraulic jump, A rectangular channel of widt...

A rectangular channel of width 12ft has an upstream slope of 0.02ft/ft and a downstream slope of 0.0005 ft/ft. Both reaches have lengths of 500 ft. The upstream reach has a Manning

Hartung governer., #quesThe spring controlled governor of the “Hartung” typ...

#quesThe spring controlled governor of the “Hartung” type has two rotating masses each of 3.5 kg and the limits of their radius of rotation are 100 mm and 125 mm. The each mass is

Evaluate thermal efficiency of the engine, A carnot engines performs betwee...

A carnot engines performs between two reservoirs whose difference in temperature is 200 o C. If the work output of the engine is 0.5 times the heat rejected, make evaluation for th

Describe vibration and explain different types of vibration, Describe vibra...

Describe vibration and explain different types of vibration. Add following harmonic motions analytically:- X 1 = 4 cos (wt +100) X 2 = 6 sin (wt +600)

Calculate the natural frequency of the system, (a) A mass of 1 kg is to be ...

(a) A mass of 1 kg is to be supported on a spring having a stiffness of 9800N/m. The damping coefficient is 5.9 N-sec/m. Calculate the natural frequency of the system. Determine al

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