Used Inspection Equipment for Die Casting
Die casting is a metal casting process that is characterized by forcing molten metal under high pressure into a mold cavity. The mold cavity is created using two hardened tool steel dies which have been machined into shape and work similarly to an injection mold during the process. Most die castings are made from non-ferrous metals, specifically zinc, copper, aluminum, magnesium, lead, pewter and tin based alloys. Depending on the type of metal being cast, a hot- or cold-chamber machine is used.
In Zinc Die-casting, alloys typically contain 96% zinc and 4% aluminum. The die-casting process uses a two-piece steel die and a casting press to hold the die halves together during injection of the molten metal. Inside the steel die is a cavity that has the negative image of the part to be cast. The molten metal is injected into the cavity under pressure, accurately filling the entire void. The metal cools, and the press opens the die halves, revealing the formed part.
The zinc cast parts are very close to the desired shape, requiring little machining before they are placed into an assembly. Typical applications include copier, aircraft, and medical instrument parts. Automobile makers use zinc die castings for emblems, moldings, door handles, and brackets. Zinc die castings are easily chrome plated for durability and appearance.
Secondary alloys are made from scrap zinc castings, which have been removed from other people's scrap such as automobiles, electronic components and machinery. If done with proper control, the composition can be maintained. However, this requires great care to be exercised by the alloyer. Incoming scrap material must often be hand sorted, to ensure that contaminated material does not enter the system.
Even so, the resulting alloy will often be close to maximum allowable impurity limits, thus leaving a smaller margin for the die caster. Also alloy composition will tend to be more variable between batches as compared to alloys made from primary or recycled material. This in turn will produce variations in the castability and finishing.
Secondary alloy is usually marginally less expensive than alloys produced from primary or recycled material. This price difference is intended to account for some of the following aspects, which the die caster must contend with, the need for greater quality control involving frequent spectrographic analysis.
In spectrographic analysis, the metal is burned under a protective cover using an electrical arc. The light emitted by the burning metal is passed though an apparatus much like a prism, which breaks the light into all of its individual colors. Every element has a different set of colors, or spectrum, which is like a fingerprint. Any foreign material will alter the spectrum, and in doing so show its unique color spectrum, identifying it. The computer in the spectrograph uses sensors to pick up these colors. The computer program then produces a printout that identifies each element in the spectrum and the concentration within the metal. Elements can be reduced or increased to alter the composition.
Light-alloy castings produced for the automotive industry, such as wheel rims, steering knuckles and steering gear boxes, are considered important components for overall roadworthiness. To ensure the safety of construction, it is necessary to check every part thoroughly. Radioscopy rapidly became the accepted way for controlling the quality of die cast pieces through visual or computer-aided analysis of X-ray images. The purpose of this non-destructive testing (NDT) method is to identify casting discontinuities, which may be located within the piece and thus are undetectable to the naked eye.
(Sources: Wikipedia, Madehow.com, Zincbig, Giulio Timelli, Franco Bonollo)
Our concern here is to assist manufacturers the world over to find valuable equipment - used, pre-owned, or second-hand Spectrometers for Die Casting - which will enable them to economically expand their production and so contribute to our world's progress.
Commonly available used X-Ray machines from Yxlon, Phillips, VJ Technologies and Mark Industries; metallurgical spectrograph's from Arun, Baird and Spectro. We also sell a large selection of other inspection equipment including Zeiss, Brown & Sharp and Mitutoyo CMM's.
On the pages of this site, we hope to help you with your due diligence in researching and selecting the Used Inspection Equipment X-Ray Spectrograph CMM Machines which you may need or require.