JPH0755343B2 - Mold for manufacturing laminated fixed products - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin plate provided with a punching protrusion, and a portion including the punching protrusion is externally punched, and the thin plate piece is punched in advance in an external punching die. The present invention relates to a metal mold for manufacturing a laminated fixing product by fitting a convex protrusion on a concave portion on the rear surface of the protrusion and fixing them together.

2. Description of the Related Art In recent years, the accuracy of laminated fixed products manufactured by the above method is increasingly required to be high, and the accuracy of laminated fixed products is determined by the degree of concentricity of the protrusions and depressions centers of the ejection protrusions formed on a thin plate. It is not an exaggeration to say that it depends on whether or not it becomes.

Hereinafter, with reference to the drawings, an example of a conventional die for manufacturing a laminated fixed article will be described.

FIG. 2 is a side cross-sectional view of a tool component for forming a protrusion on a thin plate of a conventional die for manufacturing laminated fixed products.

In FIG. 2, 1 is a punch for forming a protrusion, 2 is a punch plate, 3 is a die button for forming a protrusion, 4 is a die plate, 5 is an ejector for ejecting the formed protrusion from the die button, 6 is a spring, and 7 is The lower die set.

FIG. 3 is a side cross-sectional view showing a state where the projections are formed on the thin plate with the configuration of FIG. 2, 8 is the thin plate, and the others are the same as in FIG.

FIG. 4 is a side sectional view showing a state in which a portion including a punching protrusion is laminated and fixed together with a contour punching, 9 is a contour punching die, 10 is a contour punching punch, 11 is a guide which prevents the punching protrusion from being pushed back, 8a, 8b, 8c are thin plate pieces that have been punched into the die in advance.

Problems to be Solved by the Invention However, the accuracy of the mold assembled in the configuration as shown in FIG.
However, the total accuracy after assembly is still limited, and a center shift as shown in a of FIG. 2 occurs between the forming punch 1 and the forming die button 3. When the punch-out projection is formed on the thin plate in such a state, a center deviation of a similarly occurs on the concave side and the convex side of the punch-out projection as shown in FIG. As shown in FIG. 4, when the outer shape of the portion including the punching protrusion having the center deviation is punched, the thin plate piece previously punched into the die is recessed on the rear surface of the projection and then punched. The thin plate pieces cannot be fitted completely because the centers of the protrusions are displaced. As a result, the accuracy of the laminated fixed product is deteriorated. To adjust this, means such as die button position correction and die plate position correction are taken, but this requires a lot of time.

Means for Solving the Problems In order to solve the above-mentioned problems, the die for manufacturing a laminated fixed product of the present invention corresponds to a forming punch for providing a punching protrusion on a strip-shaped steel sheet and a forming punch for receiving the punching protrusion. Equipped with a cylindrical die button, and an outer shape punching die and a die for punching the outer shape including a punching protrusion, the die button of the portion for molding the punching protrusion, the inner diameter and the outer diameter are eccentric, Further, a flange portion is provided on the die button, and a flange portion having a polygonal flat portion is used, and a die plate for holding the die button is provided with a polygonal hole for receiving the flange portion. is there.

With the above-described structure, the present invention has a die button whose inner and outer diameters are eccentric by a when the displacement of the punching projection forming punch and the center of the die button is a as shown in FIG. The punch and die button are installed so that they are in the direction opposite to the center misalignment direction, and the flat part that is processed into a polygonal shape on the flange part prevents rotation, so adjustments that previously took a long time can be done in a short time. It enables to improve the accuracy of laminated fixed products.

Embodiment One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of a die button of a punching protrusion forming portion according to the present invention. In FIG. 1, 31 has an inner diameter and an outer diameter of a.
Only the eccentric die button, 12 is a key to prevent rotation.

Here, when the center deviation of a occurs on the punch-out projection forming punch and the die button as shown in FIG. 2, the die button of FIG. 1 is replaced by the die button of FIG. Align with the eccentric direction and install.
At this time, due to the eccentricity of the inner diameter of the die button 3, the center position of the ejector 5 fitted to the inner diameter also moves, but the eccentricity a is on the order of 1/1000 mm, while the ejector 5 and the lower die Since it fits with the set 7 with a margin of 1/100 mm order, the ejector 5 can move the center position of the die button 3 following the center position of the inner diameter part of the die button 3. . The rotation of the die button is stopped by the flat portions 13-1 to 13-8 of the flange portion 13 machined in eight directions in FIG. In this example, the eccentric die button can correspond to the amount and direction of center deviation in eight directions.
The time required for centering the molding punch and the die button can be significantly reduced, and the accuracy of the laminated fixing product can be improved.

As described above, in the present invention, the die button is formed in the portion where the projection is formed on the thin plate, the inner diameter and the outer diameter are eccentric, and the flange portion has a polygonal flat portion.
It is possible to adjust in a short time what has heretofore required a lot of time for center alignment between the punch-out projection forming punch and the die button, and it is possible to further improve the accuracy of the laminated fixing product.

[Brief description of drawings]

FIG. 1a is a plan view of a stamped protrusion molding die button of a die for manufacturing a laminated fixed article according to an embodiment of the present invention, and FIG. 1b.
Is a cross-sectional view of the same side, FIG. 2 is a side sectional view of a punching projection forming portion of a conventional die for manufacturing laminated fixed products, and FIG. A sectional view and FIG. 4 are side sectional views showing a state in which a portion including a punching protrusion is laminated and fixed together with an outer shape punching in a conventional die for manufacturing a laminated and fixed product. 31 …… Die button with an eccentric inner and outer diameter and a polygonal flat section on the flange, 12 …… Anti-rotation key. 13-1 ~
13-8 ... Polygonal flat part provided on the flange part.

Claims (1)

[Claims] 1. A forming punch for providing a punching protrusion on a strip-shaped steel plate, a cylindrical die button provided corresponding to the forming punch for receiving the punching protrusion, and an outer shape for punching the outer shape including the punching protrusion. Equipped with a punching punch and a die, the inner diameter and the outer diameter of the die button of the portion for forming the punching projection are eccentric, and the flange portion is provided on the die button, and the flange portion has a polygonal flat portion. And a die plate for holding the die button, wherein a die plate for holding the die button is provided with a polygonal hole for receiving the flange portion.