JPH0832344B2 - How to remove taper can with flange - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for extracting a tapered can with a flange, and more specifically, a flanged taper formed by squeezing a thin metal plate or a thin plate made of a laminated material mainly containing metal. The present invention relates to a method for removing a can from a female mold without damaging it.

[Conventional technology]

A thin metal plate (or a thin plate made of metal-based laminated material) is squeezed into a cup and deep-drawn to form a tapered can with a flange.
A conventional method for extracting it from the female mold will be described with reference to FIGS.

FIG. 5 is an explanatory view of a conventional process of molding a thin plate into a cup, (a) showing before molding and (b) showing during molding. FIG. 6 is an explanatory view of a conventional deep drawing step for molding the obtained cup into a tapered can with a flange, and the processing proceeds in the order of (a) to (e).

The taper can has an inverted trapezoidal vertical cross-sectional shape, and the cross-sectional shape thereof is not limited to a circular shape, but the cross-sectional shape is circular here.

First, the circular thin plate 5 is sandwiched between the female die 6 and the wrinkle retainer 7, and then the male die 8 is pushed into the female die 6 as shown in FIG. 5 (b). As a result, the thin plate 5 is dragged into the female die 6 and is eventually molded into a cup 4 having a circular bottom and a cylindrical side wall following it. When the molding is completed, male 8
Is retracted, then the wrinkle retainer 7 is retracted, and the cup 4 in the female die 6 is pushed out by the knock outer 9.

The cup 4 is conveyed to a deep-drawing molding apparatus and, as shown in FIG. 6 (a), is covered with a cylindrical wrinkle retainer 12 (the outer diameter of which is slightly smaller than the inside of the cup). The wrinkle presser
A male mold 11 having a shape in contact with the inside of the tapered can, that is, a frustoconical outer wall is provided in the inside 12. Then, as shown in FIG. 6 (b), a female die 10 having a truncated cone-shaped inner wall is brought into contact with the cup 4, and the bottom wall of the cup 4 serves as the end face of the female die 10 and the end face of the wrinkle retainer 12. Clap between and. In this state, the male die 11 is press-fitted toward the female die 10, deep-drawn, and as shown in FIG. 6 (c), a circular can bottom and a cylinder whose diameter increases as it goes to the opening side. A tapered can 1 having a flange portion 2 that extends horizontally and annularly at the opening-side end portion is formed following the portion and the body portion. The flange 2 is sandwiched between the end surface of the female die 10 and the end surface of the wrinkle retainer 12. When molding is completed in this way, the male mold is first removed and then the wrinkle retainer 12
Moves backward, and the tapered can 1 remains in the female mold 10 as shown in FIG. 6 (d). The remaining tapered can 1 is pulled out from the inside of the female mold 10 by applying a force to the bottom of the can from the outside of the can by the knock outer 13.

[Problems to be solved by the invention]

Generally, when a thin metal plate or a metal-based laminated thin plate is squeezed into a cup and deep-drawn into a tapered can, the bottom of the resulting tapered can remains the same as the raw material, but the body and flange of the tapered can are not deformed. Undergoes major deformation. Therefore, while the bottom of the tapered can maintains the softness of the raw material, the body and the flange are so-called work hardened and hardened. Furthermore, the body is in close contact with the female mold in an attempt to restore its original shape.

The tapered can 1 shown in FIG. 6 (d) remains in the female mold 10 in such a state. For this tapered can,
When a force is applied from the outside of the can to the inside of the can by the knock outer 13 to try to pull it out from the inside of the female mold 10, it is shown in FIG. 7 (enlarged view of part D of FIG. 6 (e)). As described above, the knockout outer 13 gets stuck in the bottom of the can, and the tapered can cannot be pulled out from the female mold, and even if it is pulled out, the product has no commercial value.

The harmful effect of this thin plate taper can is that, especially when the can height of the taper can is higher than the caliber, the contact between the body of the can and the female mold is greater than that when it is not. Frequent because the area increases and the total adhesion of the can to the female mold increases. This is because the deformation resistance of the can bottom and the body in the vicinity of the can bottom when the knock outer collides with the uncured can bottom is smaller than the total amount of the above-mentioned adhesion, so that the boundary between the can bottom and the body is small. By the way, it is considered that it is deformed.

 The present invention aims to solve the above problems.

[Means for solving problems]

According to the method of the present invention, a thin plate made of a metal or a metal-based laminated material is squeezed into a cup, and the periphery of the bottom surface of the cup is provided with a top surface of the male wrinkle retainer that has risen, and a female end surface facing the top surface. A deep-drawing taper can is made by inserting the male mold into the female mold and redrawing it, and then pulling out the tapered can from the female mold.After the redrawing is completed, pull out the male mold and then press the wrinkle retainer. When descending, move the flange of the deep-drawing tapered can in the can axial direction and the pulling direction to the point where the close contact between the can body and the inner surface of the female mold, which is clamped between the wrinkle press top surface and the female mold end surface, is released. After that, the taper can is separated from the female mold by its own weight.

[Action]

As mentioned above, the bottom of the tapered can is squeezed from a thin plate into a cup, and while it is deep-drawn into a tapered can and is not subject to eyelash deformation during molding, it is as soft as the thin plate of the raw material. However, the body of the tapered can is formed by being greatly deformed from the boundary with the can bottom toward the opening side. Also, the flange of the tapered can is
Since the opening end of the cup that was most deformed when it was squeezed from the thin plate to the cup was molded by being further deformed by deep drawing, especially the opening side of the body of the tapered can and the flange, Compared to the bottom of the can, of course, it is much harder than the rest of the body.

In the present invention, when pulling out the tapered can from the female mold, even if a force larger than the force that causes the deformation of the can bottom by pushing the can bottom of the tapered can is required, the most curing degree is obtained. The high flange is pinched from both the inside and outside, and is moved in the axial direction of the can and in the pulling direction while the flange is sandwiched, and along with this, the close contact between the can barrel and the female die inner surface is released, and thereafter the taper is tapered. Since the can is separated from the female mold by its own weight, and the shocking load is not applied to the tapered can, the entire can is pulled out from the flawless female mold.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

The present invention draws a thin plate into a cup, and then deep-draws this into a taper can with a flange.
That is, since the cup forming process is the same as the conventional one shown in FIG. 5, the description thereof will be omitted and the deep drawing process and the subsequent drawing process will be described in detail.

Also in this embodiment, the target tapered can has a circular cross section.

FIG. 1 is an explanatory view showing a step of deep-drawing a cup 4 formed by drawing a thin plate into a tapered can with a flange, and further extracting it from a female mold, and FIG. 2 is a drawing shown in FIG. ) Is an enlarged view of part A, FIG. 3 is an enlarged view of part B of FIG. 1 (c), and FIG. 4 is an enlarged view of part C of FIG. 1 (d).

 First, the structure of the tool used will be described.

In the figure, 4 is a cup, 11 is a male type, and 12 is a cylindrical wrinkle retainer, but the structure and operation of these male type 11 and wrinkle retainer 12 are the same as those shown in FIG.

20 is a female type, and of course its axis coincides with that of the male type 11 and the wrinkle retainer 12. This female mold has a structure different from the conventional one. That is, although the female mold 20 has a cylindrical portion having an inner wall 21 inwardly and downwardly shaped so as to contact the outer surface of the body portion of the tapered can 1 to be formed, as is known,
An annular shape is provided below the cylindrical portion, which projects outward from the cylindrical portion and spreads horizontally and annularly. Further, an annular surface having a lower surface 29 facing the top surface of the wrinkle retainer 12 is provided on the lower side of the collar portion 22. The female ring 23 is provided, and holes 25 and 26 are opened in the lower surface of the collar portion 22 and the upper surface of the female ring 23 corresponding thereto, and the spring compressed in the holes 25 and 26 is formed. 27 are installed. The holes and springs are provided at three places at 120 ° intervals in this apparatus. Reference numeral 24 is a retainer having a cross-section of a Katsuko type.
While the female ring 23 is supported by the retainer 24,
It is always pushed downward by the force of the spring and its own weight, and when it is not pushed up by the wrinkle retainer 12, the ring 23
As shown in FIG. 2, the lower surface 29 and the female end surface 28 are separated by a space h. And wrinkle presser
When 12 rises and the female die 23 is pushed up, the female die ring 23
The lower surface 29 and the end surface 28 of the female die 20 form a plane parallel to the plane formed by the end surface of the wrinkle retainer 12, as shown in FIGS. 1 (b), (c) and FIG. The total pressing force of the three springs 27, the repulsive force, and the weight of the female die ring 23 is the inner surface of the female die.
It is designed to be larger than the force required to pull the can body that is in close contact with the inner surface 21 away from the inner surface 21.

In this example, the female die 20 has an inlet diameter of 61.5 mm and a depth of 60.
mm, taper angle 3.3 degrees, male mold 11 has a tip diameter of 54 m
m, the outer diameter of the wrinkle retainer 12 is 78 mm.
0.20 mm, 0.24 mm thick aluminum plate, 0.20 mm thick tein-free steel plate is used, the radial width of the end face 28 of the female die 20,
f (Fig. 2) was set to 0.5 to 2 mm.

Next, the method of the present invention will be described together with the effects of the male type and female type.

Referring to FIG. 1A, the wrinkle retainer 12 is covered with the cup 4 in a state where the male mold 11 is housed in the wrinkle retainer 12. At this time, the female ring 23 is hung by the repulsive force of the spring 27 and its own weight, and is supported by the retainer 24.

The wrinkle retainer 12 covered with the cup 4 in this manner is a male type 11
As shown in FIG. 1 (b), the end face of the wrinkle retainer 12 is overcome by the repulsive force of the spring 27 and the weight of the female ring 23 as shown in FIG. 1 (b). , The female die ring 23 is pushed up, and the lower surface 29 of the female die ring 23 eventually becomes the female die 20.
It becomes flush with the end face 28 of the wrinkle, and holds the bottom surface of the cup 4 to stop the wrinkle retainer 12 from rising. Then, only the male die 11 starts to rise, the end surface 28 of the female die 20 and the lower surface 29 of the female die ring 23 and the end surface of the wrinkle retainer 12 exhibit a wrinkle retaining effect in the same manner as in the conventional deep drawing device, The front end surface of the male die 11 is inserted into the female die 20 along with the inner wall 21 of the female die 20, and is shown in FIGS.
As shown in the drawing, the cup 4 is molded into the tapered can 1 while leaving the flange 2 between the end surface 28 of the female die 20, the lower surface 29 of the female die ring 23 and the end surface of the wrinkle retainer 12.

When the molding is completed, the male mold 11 immediately returns to the inside of the wrinkle retainer 12. At the same time, both the male mold 11 and the wrinkle retainer 12 start descending by a cam mechanism (not shown). Then, the pressed spring 27 exerts a repulsive force, the weight of the ring 23 itself is added, and the ring 23 is forced to descend. That is, the flange 2 of the completed tapered can 1 is sandwiched between the end surface of the wrinkle retainer 12 and the lower surface 29 of the female die ring 23, and the sandwiched wrinkle retainer 12 is sandwiched.
And the female ring 23 are lowered, a force for moving the flange 2 downward in the can axial direction and in the pulling direction is applied from the flange 2 to the tapered can 1, as shown in FIG. 1 (d) and FIG. As you can see, the body of the tapered can 1 goes down vertically,
There is a gap between the outer wall of the body and the inner wall 21 of the female die 20, and the tapered can 1 is separated from the female die 20. Eventually, the female die ring 23 is supported by the retainer 24 and stops descending, but the tapered can 1 Since the body of the wrinkle has a taper, once it has been pulled down even a little, it then descends by its own weight. As the wrinkle retainer descends, the flange 2 rides on the top surface of the wrinkle retainer 12. In this state, the tapered can descends and is taken out from the female mold 20 without any flaw.

In this embodiment, the horizontal cross section is shown as a tapered can, but
It does not matter if the horizontal cross section is oval, rice ball, square or any other shape. Further, in this embodiment, the force for moving the female ring is given by the spring, but an air cylinder may be used instead of the spring.

〔The invention's effect〕

The method of extracting the tapered can from the female mold of the present invention is, unlike the conventional method, sandwiching the flange of the tapered can from its inner surface and outer surface without applying an pushing force to the can bottom, and as it is, in the can axial direction and withdrawing. Since the extraction is performed only by applying a force to move the flange in the direction, it is possible to extract with good yield without applying an impact load to the tapered can.

Further, the method of the present invention is particularly effective for a deep-drawing tapered can made of thin plate, which requires a large force to take out the tapered can from the female mold.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a deep drawing step and a withdrawing step in the method of the present invention, FIG. 2 is an enlarged view of part A of FIG. 1 (a), and FIG. 3 is B of FIG. 1 (c). Fig. 4 is an enlarged view of the portion, Fig. 4 is an enlarged view of portion C in Fig. 1 (d), Fig. 5 is an explanatory view of a conventional process for molding a thin plate into a cup, and Fig. 6 is a conventional process for molding the cup into a tapered can. Explanatory drawing of deep drawing step and drawing step of No. 7,
The figure is an enlarged view of a portion D in FIG. 6 (e). 1 ... taper can, 2 ... flange, 4 ... cup, 11
…… Male type, 12 …… Wrinkle retainer, 20 …… Female type, 23 …… Female type ring, 24 …… Retainer, 27 …… Spring.

Claims (1)

[Claims] 1. A thin plate made of a metal or a metal-based laminated material is squeezed into a cup, and the periphery of the bottom surface of the cup is provided with a top surface of a male wrinkle retainer that has risen, and a female end surface facing the top surface. It is sandwiched between, and the male mold is inserted and redrawn to form a deep-drawing tapered can, and in the method of extracting the tapered can from the female mold, after the redrawing is completed, the male mold is extracted,
When the wrinkle retainer is subsequently lowered, the flange of the deep-drawing tapered can is clamped between the wrinkle retainer top surface and the female die end surface, and the can axial direction and the inner surface of the female die are released until the contact is released. A method of withdrawing a tapered can with a flange, characterized by moving the taper can from the female mold by its own weight after moving in the pulling direction.