Aluminium and Zamak Injection Die Casting. Industrias DOJE S.L.

Tomography is a new NDT technology (Non Destructive Testing) to obtain a 3D reconstruction of internal defects. Faults can thus be visualized and quantified with precision (spatial position, area, shape factor, ...).

What is the principle of tomography?

Tomography is to use a source radio (microwave hearth) on a workpiece or a sample rotation. The 3D image is then reconstructed by calculation.

Compared to other analysis of internal defects, the tomography means has advantages:
- True 3D image to visualize and diagnose finely internal defects,
- Quantification (Part geometry and defects)

But also imposes constraints:
- Cost of the tool
- Analysis time.

That allows to analyze the CT?

Tomography can do two things:
- From 3D dimensional control room
- From internal health control room

A founder may equip it?

Yes, some have begun to do so for dimensional inspection and health room. Customers or R & D centers are also equipped with a tomograph.

Quantification of internal defects

Micro-tomography, used by IWTC in an R & D has to acquire images with a resolution between 3 microns and 20 microns (1 voxel = 20 mm). Different materials were analyzed (Al Si9Cu3 Al Si12, Al Si17Cu3, zamak, magnesium, ductile iron, aluminum foam). The vast majority concerned the diecasting (Al, Zn) on the draft R & D.

Tomography provides access to the following information:
- Porosity rate (in an area of each)
- Pore diameter (average, min, max)
- Shape factor of pores
- Distance of the pores of the skin piece. This parameter is of crucial importance for the fatigue (in alternating bending, but also to a lesser extent in tension / compression) in the sense that defects very close to the surface initiate fatigue cracks.

However, all these data require an operation manual recount:
- Isolate the area of interest
- Perform a thresholding operation (transformation of an initial gray level image into a black-white binary image). The thresholding operation (image analysis) is clearly the most delicate.
- Erosion and dilation operations that eliminate noise (resulting from thresholding) and too small defects to have a number of pores easily analyzable.
- Analysis of the proper file for realistic rendering and transfer to an Excel spreadsheet.

Image processing

Analysis and quantification of pores

Distance to the surface (pore diameter and the ordinate) for an aluminum part 3.5 mm thick

Pores with respect to the workpiece surface (left and right) part.
Area skin part is relatively healthy.

Images of 3D tomography defects

Micro-shrinkage (3D view) - Shrinkage

Recovery (3D view) - Cold shut

Blowhole (3D view) - Blowhole pores

Shrinkage (3D view) without filtering - shrinkage (without erode and dilate operations)

Shrinkage (Al Si9Cu3)

Vídeos

1. Positron Medical
2. Recovery
3. Shrinkage
4. Soufflo shrinkage
5. Blister

A means of CND future

Tomography is a means of control that begins to emerge from the R & D and is led to the industrial development in the future as to access additional information relative to the fluoroscopy.

Source: My little blog fonderie

From DOJE INDUSTRIES S.L. we want to wish you a Merry Christmas and a happy 2014, full of health, labor and success.

Excellent video where you can see step-by-step the filling of a piece of aluminum and plastic at the same time, using a new casting machine.

The foundry institute of RWTH Aachen University presents the new developed hybrid multi-component high pressure die casting process. With this process the possibility is given to manufacture a composite part of two materials (aluminum and plastic) with one tool and one machine.

Silicon is the element of controlling almost all alloy aluminum alloys foundry both gravity sand casting and shell (Al Si7Mg0.3 Al Si12, Al Si7Cu3, ...) in die casting pressure (Al Si9Cu3Fe Al Si17Cu3). Silicon is also used in ferrous alloys where it is added in the form of ferrosilicon. There are essentially three qualities of industrial silicon are distinguished by their level of impurity. The metallurgical silicon has a low level of purity while electronic and solar photovoltaic applications require a purity level much higher. Various forms of silicon

DOJE INDUSTRIES S. L. , wishes to thank all the visitors that have come to our booth at SUMMIT 2013 (Bilbao) the days 1, 2, 3 and October 4 and have been interested by our services consists of cast Zamak and aluminum.

We would also like to thank all our customers for letting us share some of their pieces of zamak and aluminum, and also by his visit.

For those who want more information on industries DOJE S. L. , will leave you this link where you can download a Power Point presentation of our activity focused on the production of parts by injection in aluminum alloys and Zamak.

Download presentation 1.8mb

The North American investment banks Goldman Sachs and JP Morgan are accused of manipulating the price of aluminum by moving their stocks from different warehouses, generating queues in order, longer delivery times, generates premiums for customers wishing to be delivered quickly, which affects the entire market and can artificially inflate the price of the metal.

Several complaints
The complaint stems from a large trans-Atlantic users of aluminum, MillerCoors, a brewer using cans. According to MillerCoors, the aluminum price was inflated by $ 3 billion last year worldwide. Another complaint partnership has been filed in Florida, August 7, accusing the London Metal Exchange (LME), Goldman Sachs, JPMorgan Chase and Glencore Xstrata cartel in aluminum storage.

The technique of suspected fraud
The process is simple because the law requires holders of aluminum to physically go out every day 3,000 tons of their warehouse but it does not say that the aluminum to be delivered. Then just move legally aluminum of a warehouse to another. Goldman Sachs and physically stores of aluminum in 27 warehouses around Detroit. The New York Times, after an investigation revealed that a fleet of trucks will carry a daily aluminum and forth between a warehouse and another. This movement of goods would lengthen delivery times can spend six weeks to over a year. And storage is longer and the invoice to the customer is high for those who want to be delivered quickly pay a premium.

The control of raw materials by banks such as Goldman Sachs' allows them to both predict and influence commodity prices and thus determine the pricing of derivatives and hedge funds in particular on raw materials "says U.S. News.

The role not so clear LME
The LME (London Metal Exchange), which should play a regulatory role in this market is not neutral and is involved because the LME affects 1% of the rental of warehouses and is far from being independent since held until last year by banks with Golman Sachs.

The Fed survey
Given the spate of allegations of fraud, the U.S. central bank (Fed) investigates the physical assets of raw materials held by many banks. In particular it could return to the authorization granted in 2003 to conduct such activities in addition to their sawmills derivatives and commodities brokerage.

Denial of Goldman Sachs
The bank denies any dispute handling and the storage of aluminum can drive up prices. They readily believe, given the reputation of profound honesty that surrounds all of their activities.

Source: www.bfmtv.com

Source: My little blog fonderie

Automobile companies recognize that produce in China and Eastern Europe "no longer has much sense" and warning that "has created a bubble around the electric car".

But it should improve infrastructure, for example, betting on the Mediterranean corridor. Another important consideration is the excessive taxation we support.

Car manufacturers seem to be more focused on improving their conventional combustion vehicles in almercado hasten the electric models.

SOURCE and extended news: Expansion.com

Anodizing of aluminum (or anodic oxidation) is an electrolytic surface treatment can produce a thin protective surface layer and passive microporous alumina (Al2O3) a few tens of microns. The aluminum foundry alloys can all be anodizing treatment.

Principle anodizing SEM anodized layer

What is anodizing?
The functions of anodization are:
- Decoration (many colors)
- The mechanical protection against corrosion, wear (hardness)
- The hanging before painting (not clogged deposit)
- The electrically insulating protective

Handle anodized anodized Lighting

Types of anodizing
There are several types of anodizing:
- Anodizing "hard" in a bath of sulfuric acid (100 microns)
- Chromic Anodizing (a few microns)
- Sulfuric anodizing (10 to 20 microns)

Anodizing decoration (or decorative) can bring a superficial coloration of the aluminum part with pigments (many colors available).

The anodizable alloys
Alloys containing silicon (Al Si family) can be anodization of protection, but are not recommended for decorative anodizing. A high silicon content has a tendency to give a grayish hue. Al MG10 transformed into die casting, provides multiple color decorative anodizing. Al and Al Si2MgTi Mg3Ti (gravity die casting) produce highly decorative colors.


Subset in anodized aluminum pressure

Different thicknesses are achievable anodizing (5 to 50 microns) and depend on the function of the room.

Anodizing operation
The anodizing process consists of a series of bathroom (followed by intermediate rinsing) to prepare a first surface, a second oxide to produce a third color for the potential and the last to stabilize.

Standard
"Specification hard-anodized aluminum and alloys" ISO 10074

Fuente: http://souspression.canalblog.com

Among the upcoming Days 01 to October 04, 2013 on the premises of the Bilbao Exhibition Centre in the city of Bilbao, is being held, the fair interpresarial outsourcing and Cooperation "Outsourcing 2013 Bilbao" is the only sector International Fair in Spain and a Top of Europe.

This year will be given appointment Doje Industries with the best companies and professionals where we will show our latest developments and innovations.

For this reason, we invite you to visit us at our booth that will be located in Hall 1, E37.

If you are interested in visiting, I remind you that you have at your fingertips the registration form for easy access to the fair.

Access to the registration form

Zinc formed in die casting is used in many industries ranging from automotive to electronics through the building. Le zinc transformé en fonderie sous pression offre de nombreux avantages (précision dimensionnelle, revêtement de surface, résistance mécanique importante, grande série économique, ...) Zinc die casting turned into many advantages (dimensional accuracy, surface coating, high mechanical strength, high economic series, ...)