JPH0261858B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a fitting device, and more particularly, the present invention relates to a fitting device, and more particularly, a fitting device that connects open ends of two hollow bodies, such as an upper can body and a lower can body, by press fitting. The present invention relates to a die device for fitting.

(Prior Art and Problems to be Solved by the Invention) As shown in FIG. 3, a relatively thin, dish-shaped seamless upper can body 1 formed by drawing has a narrow mouth portion 1b. Similarly, the lower can body 2 has a relatively thin (for example about 0.15 to 0.30 mm) open end 1a and a seamless cylindrical body 2b formed by drawing and ironing. mm)
When manufacturing a metal container 3 having a circumferential joint 3a by joining the reduced diameter portion 2d of the open end 2a via the heat-fusible adhesive layer 4, the open end 2a of the lower can 2 An adhesive layer 4 is formed in advance on the outer peripheral surface of the reduced diameter portion 2d, and this is press-fitted into the open end 1a of the upper can body 1, so that the adhesive layer 4 is subjected to internal pressure in the radial direction due to spring back. In this state, heating the fitting portion above the heat-sealable temperature of the adhesive to heat-seal the inner surface of the open end 1a and the adhesive layer 4 prevents external damage to the open end. It is desirable to obtain a satisfactory circumferential joint 3a without pores or the like without applying pressure (it is practically difficult to apply pressure from the outside to a relatively thin open end).

In this case, in order to facilitate press-fitting, the upper can body 1
A short curled portion 1a ₁ (or tapered portion) that expands outward is usually provided at the tip of the open end 1a.

However, the curled portion 1a ₁ (or tapered portion) is
Due to the anisotropy of the material, the length is not uniform along the circumferential direction, and portions that are close to straight tend to occur.
Therefore, conventionally known methods such as JP-A-58-
When trying to press-fit the lower can body 2 into the upper can body 1 by the method or device disclosed in JP-A No. 173034 or JP-A-58-81529, the lower can body The end faces of the open ends 2a of the two abut against each other, which tends to cause a problem in that it is difficult to press-fit smoothly. In an attempt to eliminate this almost straight part, the curled part 1a ₁ (or tapered part)
Increasing the length not only impairs the appearance or incurs costs due to an increase in the amount of material used, but if it is too long, the open end 1a of the upper can body
If the tip of the can protrudes outward in the radial direction of the body 2b of the lower can body 2, the sharp cut edge may injure hands or fingers, or if the product is shrink-packed with heat-shrinkable plastic film or if a label is pasted. This poses a problem in that the film or label may break due to the cut edge when the film or label is attached to the paper.

(Object of the Invention) The present invention has been made in view of the problems of the prior art described above, and an object of the present invention is to have a relatively short curled portion or tapered portion (for example, an average length of 0.3 mm).
The object of the present invention is to provide a fitting device for a hollow body such as a can, which is unlikely to cause abutment of end faces during press-fitting, even if there is a nearly straight portion.

(Structure of the Invention) In order to achieve the above object, the present invention provides a main body having an outer diameter larger than the outer diameter of the end surface of the open end of the first hollow body within the open end of the first hollow body. , a fitting device for press-fitting an open end of a second hollow body having a short cylindrical small diameter portion connected via a shoulder, the device comprising: a fixed die having a first hole in contact with the die, and a second hole coaxial with the first hole and comprising a plurality of split pieces that are slidable in the radial direction along the contact surface; a movable die having an inner diameter of a first hole in the contact surface of the fixed die is substantially equal to an outer diameter of an end surface of an open end of the first hollow body; The piece is elastically biased inward in the radial direction, and in a state before fitting, the second hole formed by the split piece is on the contact surface side into which the small diameter part can be loosely inserted. a short cylindrical part, and a curved part that connects to the short cylindrical part and expands outward, and the part of the movable die that protrudes inward in the radial direction of the contact surface forms a stepped part. The open end of the second hollow body is inserted into the first hole of the fixed die and the end face is engaged with the stepped part. the second movable die
When the split piece is press-fitted into the open end of the first hollow body through the hole, the shoulder of the second hollow body and the curved part engage, and the split piece slides radially outward. , provides a fitting device characterized in that the stepped portion disappears.

(Example) The present invention will be described below with reference to drawings which are examples.

1 and 2, 5 is a die device for fitting, and contact surfaces 6a and 7 perpendicular to the axial direction.
A fixed die 6 and a movable die 7 are provided, which are in contact with each other at a point a. The hole 8 of the fixed die 6 includes a short cylindrical portion 8a and a truncated conical portion 8b that expands outward from an outer end _8a1 of the short cylindrical portion 8a in a morning glory shape. Inner diameter D ₁ of the short cylindrical portion 8a (see Figure 4a)
When the open end 1a of the upper can body 1 is inserted into the hole 8 (see FIG. 4b), the end surface 1 of the curled portion 1a ₁ is adjusted to the extent that the roundness of the curled portion 1a ₁ can be ensured.
a ₁ ′ is substantially equal to the outer diameter D ₂ .

The movable die 7 is made up of a plurality of (six pieces in the figure) split pieces 9, each split piece 9 is formed with a through hole 10, and each split piece 9 is secured by a bolt 11 passing through the through hole 10. It is attached to the fixed die 6 so as to be slidable in the radial direction along the contact surface 6a. Also, each split piece 9
An elastic ring 12 made of elastic rubber, a spring, or the like is provided around the holder, and the split piece 9 is elastically biased inward in the radial direction. and split piece 9
The arcuate protrusion 9a provided on the contact surface 6a of the fixed die 6 is normally engaged with the annular recess 13 provided on the periphery of the contact surface 6a of the fixed die 6, and at this time, the bolt 11 and the through hole 10 are connected to each other in the radial direction. The sides are almost touching and the split piece 9
radially inward contraction is restricted and is in a contracted state.

In this contracted state, the hole 14 formed by the split piece 9 and the short cylindrical portion 14 on the contact surface 7a side
a and the short cylindrical portion 14a via the curvature portion 14b.
It has a truncated conical portion 14c connected to the truncated conical portion 14c.
The short cylindrical portion 14a in this contracted state is coaxial with the short cylindrical portion 8a of the hole 8, and has an inner diameter D ₄
is slightly smaller than the inner diameter D ₁ of the latter, so that the short cylindrical portion 14a protrudes radially inward and a stepped portion 15 is formed by the inner portion of the contact surface 7a.

The through hole 10 has an oval cross-section with a radial diameter larger than the diameter of the bolt 11, and in the contracted state, there is a gap of 1 mm inside the bolt 11 in the radial direction.
6 is formed, and therefore, when a force acting radially outward against the elastic ring 12 is applied to the split piece 9, the distance 16 decreases and the inner diameter of the short cylindrical portion 14a increases. , is coming to an expanded state.

The open end 2a of the lower can body 2 is inserted into the fitting hole 14. As shown in FIG. 4a, the open end portion 2a includes a reduced diameter portion 2d connected to the cylindrical main body 2b via a shoulder portion 2c, and at least the outer surface (in the case of the figure, the end surface) of the reduced diameter portion 2d. and an adhesive layer 4 formed on the inner surface as well. The reduced diameter part 2d including the adhesive layer 4 (herein referred to as the small diameter part 17; if the adhesive layer 4 on the outer surface side is not formed, the reduced diameter part 2d itself becomes the small diameter part 17). The outer diameter D ₃ of the small diameter portion 17 can be press-fitted into the short cylindrical portion 1a ₂ of the open end 1a of the upper can (therefore, D ₃ is smaller than the inner diameter D ₅ of the short cylindrical portion 1a ₂ ) and in the contracted state the hole 14
The dimensions are such that it can be loosely inserted into the short cylindrical portion 14a (loosely inserted in this specification includes the case where D ₃ =B ₄ ). The outer diameter of the main body 2b of the lower can body 2 is set to be larger than the outer diameter of the end surface 1a ₁ ' of the curled portion 1a ₁ of the upper can body.

(Description of the operation of the invention according to embodiments) Using the die device 5 described above, the upper can body 1 and the lower can body 2 are fitted together in the following manner.

First, the narrow opening 1b of the upper can body 1 is held by the gripping tool 18 as shown in FIG. 4a, and inserted into the hole 8 of the fixed die 6, and the open end The end surface 1a ₁ ' of the portion 1a is engaged with the stepped portion 15.
At this time, the outer end of the end surface 1a ₁ ' substantially contacts the inner surface of the short cylindrical portion 8a, thereby improving the roundness of the curled portion 1a ₁ and therefore the open end 1a and the coaxiality with the hole 8. is ensured.

Next, as shown in FIG.
into the hole 14 of. In the step in which the end surface 2a ₁ of the open end 2a passes through the short cylindrical portion 14a, the roundness of the open end 2a and the coaxiality with respect to the hole 14 and therefore the open end 1a are ensured. Fourth
FIG _.
This shows the initial stage of press-fitting, when the part a is near the curled part _1a1 . The dimensions of the hole 14 of the movable die 7 are determined so that the curved portion 14b starts engaging with the shoulder portion 2c of the lower can body at this stage. The end surface 1a ₁ ' of the opening end 1a is on the stepped portion 15,
The end surface 2a ₁ of the open end 2a is fitted by moving along the inner edge of the stepped portion 15, so that the curled portion 1a ₁ is partially or completely straight in the circumferential direction. Even if it is close, the end face 1
There is no risk that a ₁ ' and 2a ₁ will collide, making press-fitting impossible.

While holding the upper can body 1 in the position shown in FIG.
As shown in Fig. 4c, the curl part 1
The press-fitting is completed by continuing until the inner surface of a ₁ and the outer surface of the middle part of the shoulder 2c come into contact with each other, and the fitting can body 21
is formed. In the process from FIG. 4 c to FIG. and slide radially outward. Since the outer diameter of the main body 2b of the lower can body 2 is set larger than the outer diameter of the end surface 1a ₁ ' of the upper can body 1, as shown in FIG. The portion 15 disappears, and the portion corresponding to the short cylindrical portion 14a on the inner surface of the split piece 9 is replaced by the fixed die 6.
It is located radially outward from the short cylindrical portion 8a. Therefore, by pushing the gripping tool 18 in the direction of arrow A, the movement of the end surface 1a ₁ ' is not hindered by the stepped portion 15, and the fitting can body 21 is moved as shown in FIGS. 4e and 4f. can be easily extracted from the die device 5 in a short time. The cutout piece 9 is slid radially inward by the action of the elastic ring 12, and after completion of the extraction, the stepped portion 15 is again formed as shown in FIG. 4f.

The hollow body to which the die device of the present invention is applied is not limited to the above embodiments, and may be a hollow body made of plastic, for example. Further, as shown in FIG. 5, the die device of the present invention has a relatively thick and straight first hollow body having a curved portion 31a ₁ (or tapered portion) formed on the inner surface of the tip of the open end portion 31a. This can also be applied when the open end 32a of the second hollow body 32 is press-fitted into the open end 31a of the second hollow body 31. Alternatively, as shown in FIG. 6, the straight open end 4 of the first hollow body 41
1a, it is relatively thick and has a tapered part 42 on the outer surface of the tip.
The present invention can also be applied to the case where the open end 42a of a second hollow body having the open end 42a formed with _{a 1} (or a curvature) is press-fitted.

(Effects of the Invention) The fitting device of the present invention includes a fixed die and a movable die having a plurality of split pieces that are slidable in the radial direction along the contact surface with the fixed die. , the portion of the contact surface of the movable die that protrudes inward in the radial direction serves as a stepped portion, and while the end face of the open end of the first hollow body is engaged with the stepped portion, the second hollow body is By moving the opening end along the inside of the stepped portion, the opening end of the second hollow body is press-fitted into the opening end of the first hollow body. Even if the tip of the open end is straight or nearly straight on the entire circumference or in part, press fitting can be performed without the end faces of the open end coming into contact with each other.

Furthermore, by the time the fitting is completed, the shoulder part of the second hollow body and the curvature part of the movable die are engaged, the split pieces slide radially outward, and the stepped part disappears. This has the effect that the fitted first and second hollow bodies can be easily extracted from the die in a short time.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an apparatus that is an embodiment of the present invention, FIG. 2 is a side view taken from the - line in FIG. 1,
FIG. 3 is a vertical cross-sectional view of an example of a metal container in which an upper can body and a lower can body are fitted together using the apparatus of the present invention, and FIG. FIG. 4A is a longitudinal cross-sectional view showing an example of the process of fitting the lower can body to the upper can body of FIG. Drawing shown, No. 4
Figure c is a diagram showing the initial state of mating, Figure 4 d is a diagram showing a state in which mating has been completed, Figure 4 e is a diagram showing a state immediately after the start of extraction of the fitted can body, and Figure 4 f
5 and 6 respectively show the state immediately before the end of extraction, and FIGS.
FIG. 2 is a vertical cross-sectional view of a main part showing an initial state in which the hollow body of the third example is fitted using the apparatus of FIG. 1; 1... Upper can body (first hollow body), 1a... Open end, 1a ₁ '... End face, 2... Lower can body (second
(hollow body), 2a... open end, 2b... main body,
2c...shoulder part, 5...die device, 6...fixed die, 6a...contact surface, 7...movable die, 7a...
Contact surface, 8... first hole, 9... split piece, 12...
...Elastic ring, 14...Second hole, 14a...
Short cylindrical part, 14b... Curvature part, 15... Step part, 17... Small diameter part, 31, 41... First hollow body, 31a, 41a... Open end part, 32, 42...
...Second hollow body, 32a, 42a...Open end.

Claims (1)

[Claims] 1. A short cylindrical small diameter part connected to the main body, which has an outer diameter larger than the outer diameter of the end surface of the open end of the first hollow body, within the open end of the first hollow body via a shoulder part. A fitting device for press-fitting an open end of a second hollow body having a second hollow body, the device comprising: a fixed die having a first hole; and a fixed die having a first hole; , a movable die having a second hole coaxial with the first hole and comprising a plurality of split pieces slidable in the radial direction along the contact surface, the contact of the fixed die an inner diameter of the first hole in the surface is substantially equal to an outer diameter of the end face of the open end of the first hollow body, and the movable die segment is elastically biased radially inwardly. , in the state before fitting, the second hole formed by the split piece is connected to the short cylindrical part on the contact surface side into which the small diameter part can be loosely inserted, and to the short cylindrical part. the movable die has a curvature portion that expands outward, and a portion of the contact surface of the movable die that protrudes inward in the radial direction forms a step portion;
While the open end of the first hollow body is inserted into the first hole of the fixed die and its end surface is engaged with the stepped part, the open end of the second hollow body is inserted into the movable part. When pressed into the open end of the first hollow body through the second hole of the die, the shoulder of the second hollow body engages with the curvature, causing the split pieces to move radially outward. 1. A fitting device characterized in that the fitting device slides in a direction such that the stepped portion disappears.