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

Evaluate the stresses in the concrete and steel bars, A load of 1.9 MN is a...

A load of 1.9 MN is applied on a short concrete column 300mm x 300mm. The column is reinforced with four steel bars of 10mm diameter, one in each corner. Evaluate the stresses in t

Improvement of existing airport, Improvement Of Existing Airport: The ...

Improvement Of Existing Airport: The improvements that are usually needed for existing airports fall under the following categories : (a)        Extension of runway to acco

Objectives service and maintenance procedures , Objectives After study...

Objectives After studying this unit, you should be able to explain various procedures in service and maintenance, and appreciate the importance of the inspections

Combustion chamber and radiant section, Q. Combustion Chamber and Radiant S...

Q. Combustion Chamber and Radiant Section? The combustion chamber and the radiant heat transfer section of the Steam Generators shall be a horizontal, multiple pass arrangement

What is strap footing, What is strap footing? Strap Footing You have...

What is strap footing? Strap Footing You have to use cantilever or strap footings when the proximity of a property line precludes the use of other types for example an isola

Describe polythionic acid corrosion, Q. Describe Polythionic Acid Corrosion...

Q. Describe Polythionic Acid Corrosion? Although it is not typically thought of as high temperature corrosion, polythionic acid stress corrosion cracking occurs in areas where

Hydraulic ram, definition and picture of hyreaulic ram

definition and picture of hyreaulic ram

Explain about vessel design loads, Q. Explain about Vessel Design Loads? ...

Q. Explain about Vessel Design Loads? Vessels and their supports shall be designed for all of the following conditions: • Erection: dead weight of fully dressed, empty vesse

Define maximum allowable working pressure, Q. Define Maximum Allowable Work...

Q. Define Maximum Allowable Working Pressure? The MAWP to be marked on the Section VIII nameplate is defined as the maximum gauge pressure permissible at the top of a completed

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