JPS61276728A - Production of cap unit - Google Patents

Abstract

PURPOSE:To improve the workability and to reduce the cost by forming a circular arc part on a horizontal flange after forming with drawing by a press the upper wall and side wall, then by inserting the cap with elastic hook and by deforming with pressing the circular arc part as well. CONSTITUTION:The metallic plane material of a tin plate, etc. is first formed with pressing by two cutting lines concentrically. The upper wall 1g, side wall 1h and horizontal flange 1i are then formed with the drawing forming of the center part of the inner side cutting line. An annular pick 1k and crest-shaped projection bar 1l are formed on the upper wall 1g further. A enclosing member 1 is then taken out by cutting with press the outer edge of the horizontal flange 1i. A cap unit 6 is completed by deforming the circular arc part 1m by inserting the cap 2 with elastic hook into the horizontal flange 1i which is formed in circular arc shape 1m via the inner and outer dies. With this method, the drawing formation is made easy and the improvement in the workability and reduction in the cost are enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a cap unit that combines a cap with an elastic hook and a metal sealing member, and particularly for use in beverage cans, paint cans, oil mills, etc. The present invention relates to a method of manufacturing a cap unit suitable for use as a device on a can mouth.

Conventional technology Since the conventional cap unit was developed in 1988,
The cap is designed to be difficult to remove even if a tool such as a screwdriver is applied to the lower end of the cap with an elastic hook and the lower end of the sealing member (1) to remove them together.

A method of manufacturing such a cap unit is shown in FIGS. 12 to 15.
This will be explained using figures. First, the metal sealing member is punched from a flat plate into a disk shape, and at the same time the upper wall (l) is punched out as shown in FIG.
The upper wall (lla) and side wall (llb) are formed.
) Drill a K circular hole (IIc). Next, as shown in FIG.
id). This concave groove (lid) is particularly formed when the inner mold and the outer mold are pressed together and moved around the entire circumference.

After that, the IC [! ! A circular arc portion (lle) is formed by moving the tip of 1% (lxd) around the entire circumference while pressing it with another inner mold and an outer mold.

Then, as shown in FIG. 15, the cap (12) with the internal pressure elastic hooking piece of the sealing member (1i) is forcibly inserted using the elasticity of the elastic hooking piece (12b), and the cap unit (1
3) - Problems to be Solved by the Invention According to the conventional manufacturing method of a cap unit, after a concave groove (lid) is formed in the side wall (llb), the tip thereof is formed into an arcuate part (lie). Since I/C is formed, the upper wall (ll
a) and the side wall (llb) had to be drawn deeply, drawing was difficult, and expensive materials had to be used for the sealing member. Further, extra material was required to form the arc portion (lie). In addition, the cap (2) with the elastic hook was forced to be inserted into the sealing member (1), making the insertion work troublesome. Moreover, the concave groove (lid)
) and the arcuate portion (lie), both involve pressing an inner mold and an outer mold and moving them over the entire circumference, which makes molding troublesome.

Means for Solving the Problems The present invention provides a method for changing the metal sealing member (1) from a flat plate state to an upper wall (
Ig), after drawing the side wall (1h) with a progressive press leaving the horizontal flange (1i), this horizontal flange (1i) is drawn.
1i) is formed into a circular arc part (1 m) K, and the inner diameter of the circular arc part (1 m) is smaller than the inner diameter of the side wall (lh),
In addition, the sealing member (1) is deformed to become larger than the maximum outer diameter of the cap (2) with elastic hook piece in the closed state.
) After inserting the cap (2) with internal elastic hook.

If the arcuate portion (1m) is further deformed inward by pressing to prevent the cap (2) with an elastic hook from coming off, the upper wall (1g) and side wall (1h) of the sealing member (1) will be ) was drawn leaving the horizontal flange (1i), and then this horizontal flange (1i) was formed into a circular arc (1 m), making the drawing shallower and easier to draw.
The material of the sealing member can be made inexpensive. or,
When drawing 1 ft. of the upper wall (Ig) and side wall (lh) using a progressive press, a horizontal flange (li) is necessary even if the circular arc portion (1 m) is not formed, and this horizontal flange (1i) f I used it to form a circular arc (1m), so
A circular arc portion (In) can be formed without increasing material costs.

Further, in a state where the inner diameter of the circular arc portion (1 m) of the sealing member (1) is larger than the maximum outer diameter of the cap (2) with the elastic hook piece in the closed state, the cap with the elastic hook piece is inserted into the sealing member (1). (2
) is inserted, this circular arc portion (1 m) is deformed inward to prevent the cap (2) with the elastic hook from coming off, making it extremely easy to insert the cap (2) with the elastic hook. It is. Moreover, from the horizontal flange (1i) to the circular arc portion (
When molding the sealing member (1m), the inner diameter of the arc part (1m) is smaller than the inner diameter of the side wall (1h).
After inserting the cap (2) with an elastic hook, the circular arc portion (1 m) can be easily deformed inward using a press.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 to 1i. The metal sealing member (1) made of tin plate is first press-molded into a flat plate with two concentric cutting lines (la) and (1b) as shown in Fig. f82. This cutting line (
la) and (lb) K have connecting parts (IC) and (
1d), and these connecting parts (1c) and (1d) are connected to each other by 4
Set at 5 degrees apart. Next, as shown in Figure 3, there are two opening cuts that extend from the center side to near the corner cutting line (lb)! (le) and (1f) are press-molded.

This incision line (le) φ (1f) is perforated,
One cut #(If) widens near the corner cutting line (1b). After that, internal cutting*(l) of the sealing member (1)
The inner center part of b) is drawn and formed as shown in Figures 4 and 5 to form the upper wall (Ig), side wall (lh), and horizontal flange (1).
i) Shape. During this drawing process, the corner cutting line (1b)
is pulled in the direction in which the material extends and deforms inward (the diameter becomes smaller), but as shown in Figure 4, the outside of the outer cutting line (1a) and the inside of the corner cutting line (1b) are connected to each other (1d). )Toku I
C), the connecting band (1j) deforms inward and maintains the connected state. The horizontal flange (1i) is essential during drawing.

The inner diameter of the side wall (1h) is set to be larger than the maximum outer diameter that widens when the cap (2) with an elastic hook is fitted into the can opening (3).

Next, the upper wall (Ig) K of the sealing member (1) is subjected to a predetermined pressing process to form a ring-shaped knob piece (lk) and a chevron-shaped projection (1t) on the outside thereof, as shown in Figs. 6 and 7. to form.

An incision line (1e) is made at the root base of this ring-shaped knob (1k).
-(1f) matches.

Thereafter, as shown in FIG. 8, the outer edge of the horizontal flange (1i) is cut with a press to take out the sealing member (1). Figure 2~! Form up to figure E8 using a progressive press.

Similarly, the outer diameter of the horizontal flange (1i) is set to a size necessary for later winding to form a circular arc portion.

An inner mold having a concave step is brought into contact with the inner surface of the side wall (1h) of the sealing member (1), and the arcuate surface of the outer mold is pressed against the tip of the horizontal flange (1i), and this is applied to the entire surface of the sealing member (1). Horizontal flange (1i) by moving around the circumference
As shown in Fig. 9, roll it upward and form it into a circular arc part (1 m). At this time, since the inner mold has a recessed step, the arc part (
The inner diameter of the cap (1 m) is smaller than the inner diameter of the side wall (1 h), and larger than the maximum outer diameter when the cap (2) with an elastic hook is closed. Next, after inserting the cap (2) with an elastic hook piece into the sealing member (1) as shown in Fig. 10, the circular arc portion (1 m) is deformed inward by a press as shown in Fig. 1i. The cap unit (6) is completed in this state by preventing the cap (2) with the elastic hook from coming off. Similarly, after this, insert the backing (7) into the cap (2) with the elastic hook.

This cap unit (6) is pressed against the can mouth (3) from above to fit the cap (2) with the elastic hook piece onto the can mouth (3), and the circular arc portion of the sealing member (1) is sealed. (1m
) is further deformed inward over the entire circumference, resulting in the state shown in FIG. In this state, even if an impact is applied to the center of the upper wall (2a) of the cap (2) with an elastic hook during transportation,
Since the lower end of the elastic hooking piece (2b) is tightened by the circular arc portion (1m) of the sealing member (1), the elastic hooking piece (
1b) will not open and come off the can opening (3). In addition, in such a state, use a tool such as a screwdriver at the circular arc section (
1e) and the lower end of the elastic hooking piece (lb) to remove the sealing member (1) and the cap with elastic hooking piece (2) at the same time, because the strength of the arcuate part (1m) is strong. It is difficult to remove them together. Therefore, when removing the cap (2) with the elastic hook piece, hook the ring-shaped knob piece (1k) with your finger and pull it up.
Break the perforation f) and then continue pulling to cut the circular arc portion (1 m) to remove the sealing member (1), and then remove the cap with elastic hook (2). Arc part (
Even if there is no cutting line in 1 m), if the cut is made close to the circular arc part (1 m), it will be easily cut because the circular arc part (1 m) is small.

According to the manufacturing method of such a cap unit (6), from the flat plate state of the sealing member (1), the upper wall (1g) and the side wall (lh
) is drawn and formed leaving the horizontal flange (1i),
Since this horizontal flange (li)') is formed into a circular arc portion (1 m), the drawing depth becomes shallow, drawing becomes easy, and the material of the sealing member can be made inexpensive. In addition, when drawing the upper wall (Ig) and side wall (lh) using a progressive press, the horizontal flange (1i) is necessary even if the circular arc portion (1 m) is not formed, and this horizontal flange (1i) Since the arc part (1m) was formed using
Arc parts (1 m) can be formed without increasing material costs.

Further, when the inner diameter of the circular arc portion (1 m) of the sealing member (1) is larger than the moth-sized outer diameter of the cap (2) with the elastic hooking piece in the closed state, the elastic hooking piece is attached inside the sealing member (1). Middle Yap (2
) is inserted, this circular arc portion (1 m) is deformed inward to prevent the cap (2) with the elastic hook from coming off, making it extremely easy to insert the cap (2) with the elastic hook. It is. Moreover, from the horizontal flange (1i) to the circular arc portion (
When molding (in), the inner diameter of the arc part (1 m) was made smaller than the inner diameter of the side wall (xh), so 1. After inserting the cap with external hook (2) into the sealing member (1), ,
This arcuate portion (1 m) can be easily deformed inward using a press.

Effects of the Invention According to the cap unit manufacturing method of the present invention, the sealing member can be easily drawn and formed using inexpensive materials, and an arcuate portion can be formed without increasing material costs. The cap with elastic hook piece can be easily inserted into the sealing member.
This has the effect that a press can be used to easily deform the arc portion inward.

[Brief explanation of drawings]

Figure 1 ~ fi! , 1i are diagrams showing the manufacturing method of the cap unit of the present invention, FIGS. 2N to 4 and 6 are plan views, and FIGS. 5 and 7 to 8! , 1i is a sectional view, FIGS. 4 and 5, and 6 and 7 are state diagrams of the same process, respectively. FIGS. 12 to 15 are sectional views showing a conventional method of manufacturing a cap unit. be. l・・−・−・Sealing member, 2−・−・−・Cap with elastic hook piece, 3・・・・・・・Can mouth, 4・・・・・・・
・・・・Inner mold, 5・・・Outer mold, 6−・−・・Cap unit 22n Lee Ishi 1'4 bidet', yzzuh off ζ0 calculation 80
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Claims (1)

[Claims] 1. From the flat plate state of the metal sealing member (1) to the upper wall (1g)
, After drawing the side wall (1h) with a progressive press leaving the horizontal flange (1i), this horizontal flange (1i)
is formed into a circular arc part (1 m), and the circular arc part (1 m
) is deformed so that its inner diameter is smaller than the inner diameter of the side wall (1h) and larger than the maximum outer diameter of the cap (2) with an elastic hook in the closed state, and inside this sealing member (1). After inserting the cap with elastic hook (2), the arcuate portion (
1 m) further inward by pressing to prevent the cap (2) with an elastic hook from coming off.