JPS5841928B2 - Laminated and fixed products of thin plates by press processing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laminated and fixed product of thin plates formed by press working.

Conventionally, in order to perform this type of lamination fixation by press working, a punching protrusion is provided in the metal material, and the part containing the protrusion is punched out to obtain a thin layered piece. This is done by fitting the protrusion and convex part into the recess on the back surface of the protrusion of the thin plate piece that has been cut out and fixing them together, and then repeating this process to fix a predetermined number of pieces in sequence.

To explain this with reference to the drawings, FIG. 1 is an example of a press working process for laminating and fixing thin plates according to the present invention.

In the first step I, there are pilot holes 1 for press progressive processing and holes 2 necessary for the product.

In the second step (2), slot holes 3 and holes 4 necessary for the product are formed.

In the third step (2), the process of removing the punched-out protrusions, which become separated pieces of the laminated material, is performed intermittently at a time corresponding to the laminated thickness.

In the fourth process, a punching protrusion 6 for fixing the thin plates together is formed.

In the fifth step (2), while punching out the outer shape to obtain individual thin plate pieces, the convex portions of the punching protrusions 6 are fitted into the four parts on the back side of the die-cutting protrusions 6 of the thin plate pieces that have been previously punched in the outer shape punching die. Processing is performed to fix them together.

When manufacturing a laminated fixed product of thin plates by press progressive processing as described above, the quality of the laminated fixed product as an assembled product, such as the strength of the fixed product in the tensile direction, the strength in the shear direction, the strength in the torsional direction, The shape and dimensions of the punching protrusion 6 to which the pressure is applied in the fourth step (2) are factors that influence the quality, such as the adhesion between the individual thin plate pieces and the perpendicularity of the side surfaces to the bottom surface.

Conventionally, as a measure to ensure the quality of laminated and fixed products, only the fit between the four parts on the back side of the embossing protrusion 6 and the convex part of the protrusion has been pursued, and the shape of the embossing protrusion is generally a well-known general shape. That was the idea.

However, because this general shape of the punching projection has a steep slope, the slope of the punching projection and the punch may interfere with each other geometrically, as shown in the stacked state diagram of individual thin plate pieces shown in Figure 2, for example. A large gap 7 is created between the individual thin plate pieces.

Therefore, in order to improve the adhesion between the individual thin plate pieces and the diaphragm, it is common practice to apply strong pressure to the laminate in the fixing direction. This has caused problems such as breakage and misalignment.

Also, according to this general shape of the punched protrusions, compared to the individual pieces shown in Figure 3, the product has a larger stacking thickness, in other words, it is a laminated and fixed product that is elongated in the fixing direction. It has a quality defect in that it is weak in the direction of the parts.

The present invention solves the problems and drawbacks of such thin plate laminated bonded products and provides a stamped protrusion shape that allows the production of high quality bonded assembled products.

The present invention will be explained in detail below with reference to Examples.

FIG. 4 shows a case where the planar shape of the embossing protrusion according to the present invention is circular or elliptical, and FIG. 7 shows a case where the planar shape is rectangular.

5 and 8 show the XX section of the embossing protrusion, and FIGS. 6 and 9 show the Y-Y cross section of the embossing protrusion.

To explain these figures, the embossing protrusion according to the present invention has a circular, elliptical or rectangular planar shape, and the embossing portion 8 formed over the entire circumference and the parallel lines C that are parallel to each other are It consists of a center ejection part Aa parallel to the individual thin plate pieces and an ejection slope part Ab of the remaining flat inclined part, and its shape and dimensions are such that the ejection amount m of the central ejection part Aa is equal to that of the individual thin plate pieces. The punching amount n of the portion continuing to the sloped portion Ab without exceeding the thickness is 20% or more of the thickness of the individual thin plate piece, and the inclination angle of the sloped portion Ab is 20 degrees or less.

FIG. 10 shows a state diagram of lamination of thin plates using the shape of the punched protrusion according to the present invention. This is done in 20% or more of the cases.

In addition, by setting the inclination angle of the inclined portion Ab to 20 degrees or less, the interference between the inclined portions Ab of the protrusion is reduced, so that the gaps between the individual thin plate pieces are almost completely eliminated. Improves adhesion.

Therefore, the laminated and bonded product of thin plates fixed by the punched protrusions according to the present invention is strong in any direction, and there is no need to apply strong pressure to ensure adhesion between the individual pieces, so there is no residual strain. This has the effect of making it possible to manufacture high-quality laminated and fixed products without causing quality problems such as damage to the coating or misalignment.

[Brief explanation of drawings]

FIG. 1 is a plan view of the press working process for lamination and fixation, FIG. 2 is a diagram of the lamination state using conventional protrusions, and FIG. 3a. b is a perspective view showing an example of a laminated and fixed product, FIG. 4 is a front view of main parts of an individual thin plate piece in an embodiment of the present invention, and FIGS. 5 and 6 are Y-Y cross sections and X-X in FIG. 4. 7 is a front view of essential parts of an individual thin plate piece in another embodiment, FIGS. 8 and 9 are Y-Y cross-sectional views and X-X cross-sectional views of FIG. 7, and FIG. FIG. 8... Launching part, Aa... Center launching part, Ab... Inclined part, C... Parallel line.

Claims (1)

[Claims] 1. A plurality of thin plates punched by press working. This thin plate is laminated and fixed by a protrusion and a concave part formed on the front and back sides of the thin plate, and the protrusion and convex part have a protrusion that is punched out over the entire circumference and engages with the concave part of the other laminated thin plate. , a central ejected portion located at the center and parallel to the individual surface of the thin plate, and an ejected inclined portion connecting the ejected portion and the central ejected portion. A laminated and fixed product of thin plates made by press processing.