JPS62275536A - Formation of top and bottom plates for drum can - Google Patents

Abstract

PURPOSE:To improve the productivity by adjusting a ram height amount, using the press die for multiple winding structure, forming the top and bottom plates for multiple winding structure and for double winding structure, then forming a straight flange in the respective shape by a curling machine. CONSTITUTION:A drawing is performed simultaneously with flanking in zigzags by a press machine, after straightening the winding way of a coil stock with a leveller. The forming item is worked in the flange shape for double winding and multiple winding by a curling machines 30, 31. The top and bottom plates 1 for double winding are assembled with the drum shell by bending 8 the peripheral edge of the flange 2. The top and bottom plates 1' for double winding structure 1' are formed by reducing the ram height of a press machine, the peripheral edge part 2' is worked 9 and assembled with the drum shell similarly. In this way, the production can be made efficient.

Description

[Detailed description of the invention] 3. Detailed description of the invention [Industrial application field] The present invention relates to a method for forming top and bottom plates for drums.

For more details, see 2J1 with double-wound structure and multi-wound structure.
This invention relates to a method for efficiently producing a large number of top and bottom plates having different tgR pco-feels without changing the shape.

[Conventional technology]

The top plate or bottom plate of the drum (hereinafter referred to as the top plate) is the first plate.
As shown in figure (C), the connecting part with the drum body is wound 2 tons 4I.
There are two types: one formed in a Li structure 11 and one formed in a multi-wound structure 12 as shown in FIG. 1(C). These top and bottom plates are provided with concentric ribs to eliminate distortion.

The shapes of the ribs are also based on long-standing custom.
The one shown in Fig. 1(C) is: jS2 [As shown in N, the rib portion 6 has a single step shape, and the top and bottom plate central portion 7 is formed in the f plane.The one shown in Fig. 1(C) is As shown in FIG. 1(A), the rib portion 5 was a triangular mountain-shaped strain relief portion, and the central portion 4 was a convex portion.

Therefore, conventionally, it has been necessary to manufacture two different types of top and bottom plates in response to requests from customers, depending on the structure in which they are wound together with the drum body IO.

Therefore, in the past, two types of press molds were kept separately, and the molds were changed according to the needs of the respective top and bottom plates.

That is, the top and bottom plates for the double-wound structure 11 shown in FIG. S1 (C) are punched and pressed into the profile shown in FIG.
:tS1 The top and bottom plates for the multi-wound structure 12 shown in FIG. 1(C) were punched and pressed into the profile shown in FIG. 1(A).

[Problem that the invention seeks to solve]

Therefore, ■ It was necessary to have separate press dies for the top and bottom plates for the double fabric structure and the multi-wrap structure in the same press machine.

■ It was necessary to change the model each time depending on the drum can being manufactured.

(3) In particular, on a press line in which two presses are placed side by side on the same line to punch out coils in a staggered manner, mold pressing must be performed at two locations at the same time, and the time required for this process reduces production time. There was a problem that the performance was significantly reduced.

The present invention aims to provide a method that solves these problems.

[Means for solving problems]

The present invention has taken the following technical means to solve the above problems.

(L) Only the press die for punching the top and bottom plates for the multi-wound structure is used, and the ram height rI of the press machine is
By changing ``L'', a top and bottom plate for a conventional two-ton winding structure is formed.In this case, a top and bottom plate with strength equal to or higher than that of the conventional structure is formed.

■ When punching and pressing the top and bottom plates for double-layered A4R construction, the seaming part is made into a straight flange, and the curling machine in the next process is used to press it into the required flange shape for double-layered fabric construction.

■ By punching out two types of top and bottom boards using the same die according to the above ■ and ■, and curling them separately, the top and bottom boards were added I Ja
Produce paper at a high 1@ rate.

[Effect]

The present invention is basically based on the fact that it is possible to mold the difference in shape of the flange portion of two types of top and bottom plates and the rib portion for strain relief using the same mold. To explain, conventionally, Fig. 1 (a) (for multi-wound structure) and Fig. 2
The punching process using the two types of dies shown in the figure (for double cloth structure) was decided to be shown in Figure tS1 (A) instead of Figure 2.

Regarding the difference in the shape of the flange portion 2, this was adopted because the bent tip 8 is fixed and formed into a straight flange, which is adjusted by a curling machine in the first step because it is relatively cylindrical.

Regarding the shape of the rib part, it should be the same as the shape 6 (Figure 2) with a step of the top and bottom plate for double fabric structure, and that its deformation resistance is not inferior and that there is no difference in appearance (i.e., it is similar to the shape commonly used in commercial transactions for many years). It is necessary to not deviate from this range). Therefore, as a result of various studies regarding the shape of the rib portion 6 in Fig. 2, we found that a case where the shape is the same as that of the top and bottom plate for the multi-wound structure but the lamb height is reduced (resulting in the rib portion 3 in Fig. 1 (A)).
It was discovered that the above two conditions (sufficient deformation resistance and no unnatural appearance) were satisfied, leading to the present invention.

FIG. 3 is a graph showing the amount of deformation of the top and bottom plates when water pressure is applied, with the horizontal axis representing the pressurized water pressure and the vertical axis representing the amount of deformation.

The X mark in the figure is for the lip shape 6 (with a step) of the top and bottom plates for the conventional double fabric structure shown in FIG. 2, and the φ mark is for the double fabric using the top and bottom plates of the embodiment of the present invention. It is for structural purposes.

Specifically, the method of the present invention is as follows.

(1) The height of the rib portion of the top and bottom plates is changed by changing the ram height of the press machine.

In other words, in the case of a double-wrap structure, by making the height the same as the shape of the distortion relief part 6 of the conventional double-wound structure top and bottom plate (Fig. 2), the concept of the top and bottom plate shape of the conventional drum can can be changed. keep it intact.

(2) The tightening part a is a straight 7 lange, and in the second step, the flange peripheral parts 8 and 9 are processed using a curling machine as shown in Fig. 1 (B) and Fig. 1 (B), respectively, to give the predetermined flange shape. shall be.

(3) In a staggered press line that punches out coils in a staggered manner using two punching presses, it is easy to form a curling machine pattern, so this may be used as a stand to form a curling machine pattern. In order to further increase productivity, two curling machines, one for double fabric structure and one for multi-wound structure, may be used in parallel.

〔Example〕

FIG. 1 shows a partial cross-sectional view showing the processing steps for the top and bottom plates in an embodiment of the method of the present invention. After that, the peripheral edge of the flange 2 is bent 8 in step (B), and assembled with the drum body 10 in step (C). The top and bottom plates for the multi-wound structure are manufactured in the same manner as in the prior art through the steps shown in FIGS. In this case, the press molds used in the steps of FIGS. 1A and 1A are the same, and the top and bottom plates for the double-wound structure are formed by reducing the ram height of the press.

A line according to an embodiment of the invention will be described in detail with reference to a staggered press line.

Figure 5 shows a press line for simultaneously punching the top and bottom plates used for drums.The coil 21 is carried to the supply position by a coil car, and is carried by an uncoiler to a leveler provided on the line, where the coil material 21 is wound. After the curls are corrected, it passes through the loop table 22 to the press machine 23.
．． 24 in a staggered pattern and drawn at the same time. After punching, the coil material is cut by shears 25 and 26 to become scrap, and the -/- side molded product is sent to the curling process via line 29 by rollers 27 and 28, and curled by curling machines 30 and 31 for double spring and multiple winding. It is processed into a 7-lunge shape for
The top plate and base plate will be processed in 4.35.

Presses [23, 24, for example, in the case of a double-wound M can with a plate thickness of 1.2 mm, raise the lamb height by 1 mm to form the double-wound top and bottom plate shape as shown in Figure 1 (A). .

That is, the rib height of the top and bottom plates is set as follows: Strain relief dimension (rib height) For double-wound structure: 0.5 mm to 1.0 mm For multi-wound structure: 1.5 mm to 2.0 mm.

In this case, the shape (
Fig. 2), but the quality performance of the drums is not impaired in any way, that is, there is no difference in dimensional accuracy as shown in Table 1. This is because we investigated the seaming performance, which is the most important aspect of the quality performance of drums. Diagonal drop 1.2 using the method shown in Figure 4
m~1.8m height row ivy results Table 2 (JIS
As shown in Table 3 (diagonal drop test results) and Table 3 (drop test results), there was no inferiority to the conventional shape.

In the conventional method, it takes about 60 minutes per press machine to hold the press mold, and in the case of a staggered press line, it takes more than that, but in this example, this is not necessary, and the mold of the flange curling machine Because it is small, it is much easier to hold than a press, and it takes about 10 minutes at most.

Therefore, even with one curling machine, it is possible to produce at a much higher rate than in the past, and when two curling machines are used in parallel as shown in FIG. 5, it is suitable for mass production.

〔Effect of the invention〕

Since the present invention is constructed as described above, it has the following excellent effects.

1) Since one press mold can be used for 2M class, equipment investment amount is reduced.

2) Two types of top and bottom plates can be manufactured simply by adjusting the ram height of the press, and there is no need for mold holding, significantly improving productivity.

3) Particularly suitable for a zigzag press line that punches and draws top and bottom plates in a zigzag pattern.

[Brief explanation of drawings]

Fig. 1 is a partial sectional view of a top and bottom plate showing the forming process of an embodiment of the present invention, Fig. 2 is a partial sectional view of a punched and drawn shape of a conventional top and bottom plate for a double-wound structure, and Fig. 3 is a partial sectional view of a conventional top and bottom plate. A graph showing the amount of hydraulic deformation between the top and bottom plates for the 2RF1S structure and the top and bottom plates of the present invention, Figure 4 is a comparison test procedure for diagonal drop strength of drum cans by the conventional method and the method of the present invention, Figure 5 is a staggered press line and a plan layout of the curling machine. l...Top plate (top plate or bottom plate) 2...Flange part 3.5.6...Rib part 4.7...Central part. 8.9...Flange peripheral portion 10...Drum body 11...Double winding structure 12...Multiple winding structure

Claims (1)

[Claims] 1. In forming the top and bottom plates for two types of drums, double-wound structure and multi-wound structure, a press mold for multi-wound structure was used, and by adjusting the ram height of the press machine, the top and bottom plates for multi-wound structure and A method for forming a top and bottom plate for a drum, characterized in that a top and bottom plate with a shallow drawing depth for a rib portion for a double-wound structure is manufactured in the same mold, and then straight flanges are processed into respective shapes using a curling machine. .