The manufacture of the riveted joints took place by means of cold forging with the use of a press. This process modifies the geometry, dimensions, and mechanical properties of a metal body by the action of direct compressive stresses. The steps are performed to forge the head of the rivets and thus to obtain the union of the joints occurred as follows:
1- Initially a 1/4 "SAE 1020, 300x300 mm steel plate was cut into eight strips (Figure 24), to be manufactured two plates: one for the rivets made by the green sand process and another for the rivets manufactured by the metal mold, four strips of 42x100 mm, which will be used as the central plates of the joint and the other four of 42x91 mm, which will be used as the upper and lower plates of the joints
Figure 1 – Steel strips.
Source: Own
2- After the steel sheets were cut, the drilling process was started (Figure 2), using a 7 mm bit for the gasket of the rivets made of sand mold and 7.5 mm for the gasket of rivets made of metal. Prior to drilling, the plates were positioned in the designed gasket shape and then welded to obtain concentric holes in all plates. These holes will be needed to fit the rivets that will join the strips.
Figure 2 – Steel strips drilling
Source: Own
3- After drilling the plates, the weld points were removed, which were used to facilitate the drilling process.
4 - After the steel plates were pierced, the rivets were placed in the holes and a die was inserted into the rivet body and taken to the hydraulic press, as shown in Figure 3, so that the final union of the steel strips.
Figure 3 - Rivet head forging
Source: Own
5 - After the procedure is carried out on all the rivet keys, obtained as riveted steel joints with the rivets manufactured by the casting in metallic medium and casting in green sand, respectively in Figure 4 and Figure 5.
Figure 4 - Riveted joint
Source: Own
Figure 5 - Rivet seal with rivets manufactured by the casting in mold of green sand.
Source: Own
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