Published on 20th Apr '14 16:20
Number of Views: 1516
Joining is a very broad category of engineering processes. Joining, as the name implies, simply refers to the process of attaching components together. The components can be the same or different materials, and the durability of the joint can be temporary or permanent.
We encounter examples of joined components everyday in our lives: from the adhesives holding our cardboard and plastic food containers together, to the threaded caps
Published on 28th Apr '12 08:40
Number of Views: 13781
Electro-Discharge Machining (EDM) is machining with sparks. The work-piece is held in a jig submerged in a dielectric fluid such as kerosene. A power supply generates rapid electric pulses that create a discharge between the work piece and an electrode (a continuous wire or a shaped graphite form) at the point at which the two are closest. The discharge creates a plasma causing the melting, and probably the vaporisation,
Published on 19th Nov '11 11:00
Number of Views: 4110
I first encountered “Rapid Prototyping” or “3D Printing” back in the late 1980's, when I contracted with a Canadian company that offered the service based on a process that used a laser to cure specific regions of a soup of liquid plastic. Very impressive, and so was the price-several thousand dollars to produce a prototype that, in production, should have cost less than a dollar. Most of the costs were the result of converting the 2D mechanical
Published on 14th Nov '11 22:10
Number of Views: 14295
Injection molding is one of the most common manufacturing methods to produce thin-wall engineered parts. Development of molds that produce high quality parts is a talent that develops with experience. Due to the time and effort required to develop a good set of tooling, it is not unusual for manufacturers to seek out injection molding machines that will be compatible with their molds, rather than trying to redesign molds to work on specific machines.
Published on 9th Nov '11 23:37
Number of Views: 1993
There are limits to the dimensions and tolerances that can be machined along the plane of the metal sheet, since etchants used in the photochemical machining process concurrently etch metals laterally and vertically through the thickness (T) of the sheet.
Because the metal at the surface of a sheet is exposed to etchant longer than the metal at the center of the sheet, the surface of a part etches laterally more than metal at the center.
Published on 26th Oct '11 22:46
Number of Views: 10148
A coherent beam of monochromatic light is focused on the workpiece causing material removal by vaporisation. Machines are generally CAD/CAM compatible, with 3-axis and 5-axis machines being generally available.
Profile creation of sheet metal parts is the most common applications, but it is also possible to drill holes and create blind features in many different types of material.
Gas-assisted laser beam machining
Published on 25th Oct '11 23:15
Number of Views: 7994
Electrical Discharge Wire Cutting (EDWC) involves a continuously spooling conductive wire (the most widely used is brass). A power supply generates rapid electric pulses that create a discharge between the workpiece and electrode (the wire). The discharge causes the melting, and probably the vaporisation, of a minute piece of material, slowly eating into the work piece. Any electrical conductive material can be machined
Published on 24th Oct '11 21:34
Number of Views: 5217
This is a metal cutting process that uses a high temperature stream of ionised gas through a water-cooled nozzle at very high velocity. An arc is formed between the electrode and the workpiece, which is constricted by a fine bore copper nozzle. Oxygen oxidises the workpiece material, and it is melted by the exothermic reaction. The melted metal is then blown away from the line of cut. Temperatures can reach up to 20,000˚C.
Published on 22nd Jun '11 22:29
Number of Views: 9194
This is a great 9 page PDF entitled "BendWorks: the fine art of Sheet Metal Bending". This is a basic guide to the main processes involved in sheet metal bending. The PDF file covers the following topics:
1) Bend allowances
2) Reverse engineering the k-factor
3) Principles of bending: Air bending, Bottoming, Coining
4) Tips and tricks
5) Other common types of bending: V bending, U Die bending, Wiping