JPS6222274Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a mold device used for molding of beverage container lids and the like.

(Prior Art) Generally, when manufacturing a product having a shape as shown in FIG. 1, which is used as a lid for a container for beverages, etc., the molding process is performed using a press. As shown in the figure, this product is made by drawing the inside of a flat plate material to form an inner bottom part 11, and drawing the outer edge outward to form a peak part 12. Beads 13 are formed on the bottom portion 11 as required. When pressing a product with such a shape, a double-action press is usually required because the inner drawing is performed and then the outer drawing is performed. It is also possible to simultaneously process the inner and outer drawings using a general-purpose single-action press machine, but there are limitations on the strength of the material (material quality, plate thickness, etc.) and drawing ratio. In particular, when materials used for beverage container lids are processed at the same time, cracks occur frequently and stable production cannot be achieved.

Furthermore, as shown in Japanese Patent Application Laid-Open No. 53-8276, a single-action mold device has been known in which the inner drawing is performed and then the outer drawing is performed. . According to this device,
Although the inner drawing and the outer drawing can be performed in a single action, this device only performs the drawing process and does not blank out the material.

(Problems to be Solved by the Invention) As described above, in the conventional apparatus, blanking, inner drawing, and outer drawing are not performed in a single action, resulting in a large number of steps.

The purpose of this invention is to enable blanking, inner drawing, and outer drawing of the material to be formed by a single action, that is, by a general-purpose press machine, and to enable stable production without causing cracks. The objective is to provide a mold device that is

[Structure of the idea]

(Means for Solving the Problems) The mold device of the present invention includes a holder 15 that is driven forward and backward in the vertical direction to perform a pressurizing operation, and a first hydraulic pressure that is integrally provided above the holder 15. A manifold 16 having a cushion 19 and a second hydraulic cushion 22, and a manifold 16 arranged below the holder 15 and formed into an annular shape, the outer periphery of which serves as a punch for blanking the material, and the inner periphery of which serves as a die for drawing the outside. The outer drawing die 17 also serves as a punch, and the outer drawing die 17 is engaged with the flange portion 17a of the outer drawing die 17 in its pressurizing direction, and penetrates the holder 15 so as to be movable back and forth, thereby forming the manifold 1.
through a pin 18 connected to a first hydraulic cushion 19 provided at The inner drawing punch 20 is connected to the second hydraulic cushion 22 provided on the manifold 16, and the outer drawing die 17 is arranged below the outer drawing die 17 so as to fit with the outer periphery of the outer drawing die 17. A punching die 30 that performs blanking, an inner periphery 33 that is arranged inside the punching die 30 so as to face the lower surface of the inner drawing punch 20 and fits with the outer periphery thereof to become an inner drawing die, and the outer drawing die. A drawing member 31 having an outer periphery 34 that fits with the inner periphery of the drawing die 17 to form an outer drawing punch, and a drawing member 31 having an outer periphery 34 that fits with the inner periphery of the drawing die 17 and a drawing member 31 having an outer periphery 34 that fits with the inner periphery of the drawing die 17 and a drawing member 31 having an outer periphery 34 that is fitted with the inner periphery of the drawing die 17 and forming an outer drawing punch between the inner periphery of the punching die 30 and the outer periphery 34 of the drawing member 31. A wrinkle presser 36 is provided so as to be movable back and forth so as to generate a predetermined repulsive force in the pressing direction, and a wrinkle presser 36 is provided so as to be able to move forward and backward so as to generate a predetermined repulsive force in the pressing direction of the outer drawing die 17 on the inner circumference 33 of the drawing member 31. The strength of the first hydraulic cushion 19 is set to be greater than the sum of the pulling force and the wrinkle pressing force, and the strength of the second hydraulic cushion 22 is set to be greater than the sum of the pulling force and the wrinkle pressing force. This is set to be larger than the inner squeezing force.

(Function) In the present invention, the holder 15 is lowered, the material 50 is blanked using the outer periphery of the outer drawing die 17 and the inner periphery of the punching die 30, and in this state, the outer drawing die 1
The lower end of the pin 18 that is engaged with the die 30 is removed.
When the holder 15 is brought into contact with the upper surface and then further lowered, the outer drawing die 17 receives pressure via the first hydraulic cushion 19, and while compressing the first hydraulic cushion 19, the outer drawing die 17 contacts the upper surface of the wrinkle presser 36. While pinching the outer periphery of the material 50 between the
The inner drawing punch 20 is connected to the second hydraulic cushion 2
2, the material 50 is lowered while being pressed between the die 40 and the inner periphery 33 of the drawing member 31 to perform the inner drawing process. Then, when the holder 15 further descends, the inner drawing punch 20 comes into contact with the inner bottom surface of the drawing member 31 via the material 50 and does not descend any further, so the second hydraulic cushion 22 begins to be compressed. ,
Further, since the first hydraulic cushion 19 has already been compressed by a predetermined stroke, the lower surface of the holder 15 comes into contact with the upper surface of the outer drawing die 17 and directly pressurizes this, and the outer drawing die 17 then presses the outer circumference of the drawing member 31. 34 to perform the outer drawing process.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In FIG. 2, reference numeral 15 denotes a holder in the upper mold, which is driven forward and backward in the vertical direction by a press machine (not shown) to perform a pressing operation to be described later. 16
is a manifold, which is integrally provided above the holder 15, interlocks with the holder 15, and is provided with a plurality of first hydraulic cushions 19 and second hydraulic cushions 22. 17
This is an outer drawing die that also serves as a blanking punch, and is placed below the holder 15.The processing part is formed in an annular shape, and its outer periphery is used as a punching punch for punching blanks from the material, and the inner periphery is used as an outer drawing die. It is used as a die for Reference numeral 18 denotes a plurality of connecting pins, which are disposed outside the processing portion of the outer drawing die 17 and are fitted into through holes of a flange portion 17a integrally formed on the upper part of the outer drawing die 17 so as to be movable forward and backward. The step portion 18a engages the outer drawing die 17 in the pressing direction (downward in the figure). The lower end is located slightly in front of the tip of the outer drawing die 17 (upward in the figure) in the pressing direction. Further, this pin 18 passes through a through hole provided in the holder 15 so as to be able to move forward and backward.
Its upper end is connected to a first hydraulic cushion 19 provided within the manifold 16. Reference numeral 20 denotes an inner drawing punch, which is arranged concentrically inside the outer drawing die 17 so as to form a constant interval with the inner periphery thereof. The holder 15 has a plurality of pins 21 integrally extending through the through holes provided in the holder 15 in a movable manner, and is connected to a second hydraulic cushion 22 provided in the manifold 16 via the pins 21. do. In addition, bead 1 shown in FIG.
When molding 3 at the same time, use the inner drawing punch 2 above.
A groove 23 for bead formation is formed on the lower surface of the 0.
Furthermore, this inner drawing punch 20 has an integral guide rod 24 that penetrates the holder 15 and the manifold 16 so as to be able to move forward and backward, and has a compression spring between the central lower surface of the holder 15 and the lower end of the guide rod 24. 28 is inserted, and the inner drawing punch 20
is guided and supported in the vertical direction by a guide rod 24. Note that 25 is a stripper and 26 is a knock-out portion, and since these are well-known constituent members of the upper mold, detailed explanation will be omitted.

30 is a punching die for the lower mold, which is the outer drawing die 1.
It is arranged and fixed below the outer drawing die 17 so as to fit with the outer periphery thereof, and blanking of the material is performed by fitting with the outer drawing die 17. 31 is a drawn member,
The inner drawing punch 2 is installed inside the punching die 30.
0, and has a concave portion 32 for an inner aperture on its upper surface. The inner periphery 33 of this recess 32 fits with the outer periphery of the inner drawing punch 20 to form an inner drawing die. Also, the outer circumference 3
4 is arranged so as to fit with the inner periphery of the outer drawing die 17, and is used as an outer drawing punch that performs outer drawing by fitting with the inside of the outer drawing die 17. That is, this drawn member 31
has two functions: an inner drawing die and an outer drawing punch. A wrinkle presser 36 is provided between the inner periphery of the punching die 30 and the outer periphery 34 of the drawing member 31 so as to be movable in the vertical direction. This wrinkle presser 36 is connected to a movable base 39 via a rod 38 that passes through a base member 37 so as to be movable forward and backward.
Further, the inner periphery 3 of the recess 32 of the drawing member 31
A die 40 is provided within 3 so as to be movable in the vertical direction, and this die 40 is also connected to a movable base 42 via a rod 41 that extends through the base member 37 so as to be movable in the vertical direction. These movable tables 39 and 42 share a common pedestal 4.
3 are provided with springs 44 and 45, respectively, and receive upward repulsive force from these springs 44 and 45. Note that a protrusion 47 for bead forming is provided on the upper surface of the die 40.

The strength of the first hydraulic cushion 19 is set to be greater than the sum of the pulling force and the wrinkle pressing force. Moreover, the strength of the second hydraulic cushion 22 is
Set it to be larger than the sum of the inner drawing force and bead processing force.

Next, the operation will be explained with reference to FIGS. 3, 4, and 5.

FIG. 3 shows a state in which the entire upper mold is lowered from the state shown in FIG. and punching die 3
The bead 13 shown in FIG. 1 is formed using the groove 23 formed on the lower surface of the inner drawing punch 20 and the protrusion 47 formed on the upper surface of the die 40. In this state, the lower end of the pin 18 engaged with the outer drawing die 17 hits the upper surface of the punching die 30 and holds the outer drawing die 17 at that height position.

From this state, when the holder 15 further descends due to the force resisting the compression spring 28 inserted between the center of the holder 15 and the lower end of the guide rod 24, the outer drawing die 17 applies pressure via the first hydraulic cushion 19. Then, while compressing the first hydraulic cushion 19, the outer periphery of the material 50 is pressed between it and the upper surface of the wrinkle presser 36. In addition, the inner drawing punch 20 receives pressure via the second hydraulic cushion 22 and descends while pinching the material 50 between it and the die 40.
As shown in FIG. 4, the inner circumference 3 of the drawn member 31
Inner drawing process is performed between 3 and 3. Here, the second
Since the strength of the hydraulic cushion 22 is set to be greater than the inner squeezing force as described above, it is hardly compressed during the inner squeezing process. Also, the first
The hydraulic cushion 19 is compressed as described above because the tip of the pin 18 is in contact with the punching die 30.

In this way, the inner drawing is completed as shown in FIG. 4, but the upper die continues to descend further. At this time, the inner drawing punch 20 holds the material 50 as shown in the figure.
Since it comes into contact with the inner bottom surface of the recess 32 of the drawing member 31 via , and does not descend any further,
The second hydraulic cushion 22 begins to be compressed. Further, since the first hydraulic cushion 19 has already been compressed by a predetermined stroke, the lower surface of the holder 15 comes into contact with the upper surface of the outer drawing die 17, and directly pressurizes this. Therefore, the outer drawing die 17 resists the repulsive force of the wrinkle presser 36 and processes the drawing member 31 along the outer periphery 34 as shown in FIG. 5, thereby performing the outer drawing process.

In this way, the continuous lowering movement of the holder 15 in the upper mold allows blanking of the material 50,
Since the inner drawing and the outer drawing are carried out sequentially and continuously, no cracks occur and stable production is possible.

Note that if it is not necessary to form the bead 13 in FIG.
7 may not be provided. Further, in this case, the strength of the second hydraulic cushion 22 need only be set to be greater than the inner squeezing force.

[Effect of idea]

According to this invention, blanking of the material, inner drawing, and outer drawing are performed in a single action.
In other words, it can be performed sequentially and continuously by applying pressure in one direction. Therefore, it is possible to perform both punching and forming using a general-purpose single-action press machine, which is effective in terms of equipment. is big. Furthermore, from the standpoint of product processing, there are no frequent occurrences of cracks, and stable production is possible.

[Brief explanation of the drawing]

Figures 1a and b are a plan view and a sectional view showing an example of a product molded by the device of the present invention, Figure 2 is a sectional view showing an embodiment of the molding device of the present invention, and Figures 3 and 3 are 4 and 5 are partial cross-sectional views showing the operating process of the apparatus shown in FIG. 2. 15...Holder, 16...Manifold, 1
7... Outer drawing die, 17a... Flange part, 1
8... Pin, 19... First hydraulic cushion, 2
0...Inner drawing punch, 21...Pin, 22...
Second hydraulic cushion, 30... Punching die, 31
...Drawing member, 33...Inner periphery, 34...Outer periphery, 36...Wrinkle presser, 40...Die.

Claims (1)

[Claims for Utility Model Registration] A holder 15 that is driven forward and backward in the vertical direction to perform a pressurizing operation, and a first hydraulic cushion 19 and a second hydraulic cushion 22 that are integrally provided above the holder 15. and an outer drawing die 17 that is arranged below the holder 15 and is formed in an annular shape, and whose outer periphery serves as a punch for blanking the material and whose inner periphery serves as a die for outer drawing. , a pin 18 that engages with the flange portion 17a of the outer drawing die 17 in its pressurizing direction, passes through the holder 15 so as to be able to move forward and backward, and is connected to a first hydraulic cushion 19 provided on the manifold 16; an inner drawing punch connected to a second hydraulic cushion 22 provided on the manifold 16 via a pin 21 arranged inside the outer drawing die 17 at a constant distance from the inner periphery thereof and penetrating the holder 15 in a movable manner; 20, a punching die 30 which is disposed below the outer drawing die 17 so as to fit with the outer periphery of the outer drawing die 17 and blanks the material by fitting with the outer drawing die 17; A diaphragm having an inner periphery 33 arranged to face the lower surface of the punch 20 and fitted with the outer periphery thereof to form an inner drawing die, and an outer periphery 34 fitted to the inner periphery of the outer drawing die 17 to form an outer drawing punch. A wrinkle press is provided between the processing member 31 and the inner periphery of the punching die 30 and the outer periphery 34 of the drawing member 31 so as to be able to move back and forth so as to generate a predetermined repulsive force in the pressing direction of the outer drawing die 17. 36, and a die 40 that is fitted into the inner periphery 33 of the drawing member 31 so as to be able to move forward and backward so as to generate a predetermined repulsive force in the pressing direction of the outer drawing die 17, and the first hydraulic cushion 19 A mold device characterized in that the strength of the second hydraulic cushion 22 is set to be greater than the sum of the pulling force and the wrinkle pressing force, and the strength of the second hydraulic cushion 22 is set to be greater than the inner squeezing force.