In the course of this week, the JLMP Engineering committed itself to obtaining a body of evidence for mechanical testing of traction and also sought bibliographical references by initiating the project of the riveted joint.
For obtaining the body of evidence, it was developed in SolidWorks software a 3d CAD model of the part, those with the dimensions according to the standard ASTM E8/E8M-Standard Test methods for Tension testing of Metallic materials.
Next was defined the method of casting that was used by the team, casting in green sand, as this one tends to present good dimensional stability, less possibility of emergence of cracks beyond the low cost of manufacturing. For the smelting was used a body of proof made available by AMGS engineering as mold.
Initially it was made to blend the sand, clay and water for the manufacture of the green sand, the proportions of the elements were based on the bibliographical mechanical technology, written in 1986 by Vicente Chiaverini Filho. Then this sand was inserted into the smelting box and compacted together with the mold along with the risering and the aluminum leakage channel, as shown in Figure 2.
For obtaining the body of evidence, it was developed in SolidWorks software a 3d CAD model of the part, those with the dimensions according to the standard ASTM E8/E8M-Standard Test methods for Tension testing of Metallic materials.
Next was defined the method of casting that was used by the team, casting in green sand, as this one tends to present good dimensional stability, less possibility of emergence of cracks beyond the low cost of manufacturing. For the smelting was used a body of proof made available by AMGS engineering as mold.
Initially it was made to blend the sand, clay and water for the manufacture of the green sand, the proportions of the elements were based on the bibliographical mechanical technology, written in 1986 by Vicente Chiaverini Filho. Then this sand was inserted into the smelting box and compacted together with the mold along with the risering and the aluminum leakage channel, as shown in Figure 2.
Figure
1: Green Sand Mixture.
Source:
Own Team.
Figure
2: Casting box molded with sand.
Source:
Own Team.
After these steps, the aluminum was cast in the liquid state in the box, and can be observed in video 1.
Video
1: Leaking aluminum in sand mold.
Source:
Own Team.
The obtained piece, figure 3, was taken to the cutting and the deburring in order to have the final body that will be used in the mechanical tensile test to determine the behavior and characteristics of the material.
Figure
3: Part obtained in the foundry.
Source:
Own Team.
It is worth mentioning that although it did not take into account the contraction calculations of the material, it was not forgotten, since it is expected to obtain from the tensile test data such as tension, bonding, among others. Which depend only on the cross-sectional area and the force applied under the body, as can be seen in the following formula:
In σ what represents the tension, F the applied force and Ao the initial cross-sectional area of the body.
References:
AMERICAN SOCIETY FOR TESTING AND MATERIALS. ASTM E8 / E8M – 16a: Standard Test Methods for Tension Testing of Metallic Materials. West Conshohocken, PA, 2016
CHIAVERINI, V. Tecnologia Mecânica. Processos de Fabricação e Tratamentos. Volume II. Editora Makron Books. 1986.
NORTON, Robert D., Projetos De Máquinas, 4. ed. Bookman editora LTDA. Porto Alegre, 2011.
Nenhum comentário:
Postar um comentário