Zamak

Zamak

Zamak (12)

Árticulos de zamak. Suministra las piezas, de conformidad con los deseos del cliente, parcial ó totalmente terminadas y asesora sobre todos los moldes y útiles necesarios.

Friday, 20 December 2013

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.

tomography_principe

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

Fig26_distance___la_surface_pore

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

Soufflure_blowhole_die_casting_tomographie

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

Images of 3D tomography defects

micro_retassure__vue_3D_

Micro-shrinkage (3D view) - Shrinkage

Reprise3D

Recovery (3D view) - Cold shut

Soufflure_3D_P5_partie2

Blowhole (3D view) - Blowhole pores

retassure_sans_filtrage

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

tomo_retassure_petite_zone

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

Wednesday, 19 June 2013

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, ...)

Friday, 07 June 2013

Surely you've ever been curious question or the difference between the different metals used for casting. Which has the highest hardness, What is the most elastic metal?, What are its physical properties?, ...

To put aside any doubts or questions, here you can download a very complete table where you can compare all the metal (zinc alloys, aluminum alloys, magnesium, brass, steel and plastic) in all its aspects, starting with the mechanical properties (yield strength, resistance to tensile strength, impact strength, ...), hardness, physical properties (density, conductivity, resistance, heat, ...) output data (minimum thickness wall, mold life, range of the production speed, ...).

VIEW THE TABLE - DIFFERENCE BETWEEN THE DIFFERENT METALS USED FOR CASTING

 

Thursday, 16 May 2013

La posibilidad de tratamientos superficiales en las piezas fabricadas en aleaciones de Zinc son múltiples, permitiendo obtener una gran variedad de presentaciones y aspectos decorativos.

Tuesday, 23 April 2013

El zinc es conocida por un material muy larga. En la antigüedad, en el nombre de bronce, fue utilizado como el cobre, estaño y cinc para las pulseras. La primera aplicación industrial data de 1814, cuando se utiliza el proceso de fabricación de la impresión de la aleación de plomo y estaño caracteres. Una amplia investigación sobre aleaciones de zinc se llevaron a cabo por el Zinc Company de Nueva Jersey (EE.UU.), que durante los años 20, fue particularmente evolucionar aleaciones de zinc. Sin embargo, el uso industrial en grandes series de aleaciones de zinc fundido transformación de fundición a escala industrial durante la década de 1960.

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