JPH0215835A - Compounded hydraulic press working method - Google Patents

Abstract

PURPOSE:To execute bulge forming by feeding a pressure liquid into a hydraulic chamber, pushing in a work to the lower part by a punch and executing opposed hydraulic forming in a first process, and feeding the pressure liquid to the inside of the work from the punch and bulging it to the outside in a second process. CONSTITUTION:In the first process, an end part of a work 4 is inserted and held by blank holding plates 11, 12 and the upper face of the lower die 6, a pressure liquid is fed into a hydraulic chamber 13 of the lower die 6, the upper die 5 is allowed to descend the work 4 is brought to opposed hydraulic forming to a cylindrical type by a punch 8. Subsequently, the work is carried to the second process, a segmental die 26 is pressed against a fixed die 25 and the lower forming die 15 is brought to clamping. Next, the work 4 is placed on moving dies 27, 28, and by operating blank holder cylinders 27, 28, a flange part 4b is inserted and held by blank holding plates 20, 21 and the moving dies. Thereafter, the work 4 is held down by a punch 17 and a bottom part 4a is pressed against the bottom face of the lower die 15, and by spouting the pressure liquid to the cylindrical part 4a from a passage 22 of the punch 17, the work 4 is formed to a tank shape. The work 4 is taken out by opening the segmenting die. In such a way, the cycle time is shortened and the productivity can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to a composite hydraulic press processing method for integrally molding a member to be molded by combining a plurality of molding methods.

b. Prior Art Conventionally, a bulge forming method has been known in which a member to be formed is bulged using a pair of upper and lower molds.

This bulge processing method sets the part to be formed in a mold,
By supplying pressure fluid into the inside of the molded member, the molded member is bulged from the inside and a molded product having a constriction is processed.

C1 Problems to be Solved by the Invention However, in the conventional bulge forming method described above, opposing liquid 1F forming (M
, drawing) and bulge forming (expansion), compared to a processing method that uses separate molds and is divided into two steps, the operating force of the mold becomes rougher, the processing time becomes longer, and , the hydraulic seal was difficult.

Furthermore, since the pair of molds used has a complicated structure, the mold cost is high and setup takes time.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a composite hydraulic press working method that can eliminate the above-mentioned drawbacks.

d. Means for Solving the Problems ■- In order to solve the problems of the prior art, in the present invention, in the first step, the end portion of the member to be formed is While holding the mold, pressure liquid is supplied into the hydraulic pressure chamber of the lower mold, and in this state, the molded member is pushed downward with the punch of the mold to perform opposed hydraulic molding, and in the second step, , the end of the member to be formed which has been subjected to the opposed hydraulic pressure forming is held between the wrinkle presser cylinder of the upper mold and the movable mold of the lower mold, and the bottom of the member to be formed is pushed downward with the punch of the upper mold. Push it into pressure contact with the bottom of the lower mold, and in this state i? 1. While moving the presser flange and the movable die downward to push the end of the member to be formed downward, the pressure liquid inside the member to be formed is fed from the punch of the upper forming mold to the outside. After the pressure liquid is discharged, the upper mold and the movable mold are moved upward, and the lower mold is divided into left and right parts to open the mold. The method is characterized in that coining molding and bulge forming are carried out by supplying compressed air into the inside of the molded member to separate the second die and the molding lower mold from the molded member.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

1 to 4 show an embodiment of the present invention, in which reference numeral 1 denotes a composite hydraulic press device for carrying out the method of the present invention, and this hydraulic press device W1 is It is equipped with a press mold 2 used in the first step and a press mold 3 used in the second step, and integrally molds a fuel tank for a motorcycle from a steel plate (hereinafter referred to as a workpiece) 4 as a member to be formed. It is something.

The press mold 2 is a mold for performing opposed hydraulic molding, and is composed of an old mold 5 and a lower mold 6. Upper mold 5, movable plate 7
and a forming punch 8 provided at the center of the lower surface of the movable platen 7.
and a pair of wrinkle presser cylinders 9.10 arranged with the punch 8 in between, and a wrinkle presser plate 11.12 is attached to the lower end of these wrinkle presser cylinders 9 and 0. There is. Further, a recessed portion serving as a hydraulic pressure chamber 13 is formed in the center of the lower mold 6, and pressure liquid is supplied into the hydraulic pressure chamber 13 from a pump device (not shown). Therefore, the pair of wrinkle presser cylinders 9. IO wrinkle press plate]
1. The intermediate part of the work 4 held between the 1.12 and the upper surface of the lower mold 6 is punch-formed with a punch 8, and the work 4 is formed into a shape having a bottomed cylindrical part 4a and a flange part 4b on the opening side thereof. be done.

The above press molding mold 3 is coining molding (Kinodashi)
It is a mold for performing bulge forming, and consists of an upper mold 14 and a lower mold 15. Molding-1-The mold 14, like the upper mold 5, includes a movable platen 16, a molding punch 17 provided at the center of the lower surface of the movable platen 16, and a pair of punches 17 placed between them. The wrinkle presser cylinders 18.19 are composed of wrinkle presser cylinders 18.19.
A temporary wrinkle presser 20421 is attached to the lower end of 9. An inverted T-shaped passage 22 is formed inside the punch 17, and pressure liquid and compressed air are supplied to this passage 22 from a pump device (not shown). Air is blown out from the outer peripheral surface of the punch 17.

Moreover, the molding lower mold 15 is the base! Support plotter 24 on i23
The fixed mold 25 backed up by
A split mold 26 that moves in the left-right direction in the figure, and a fixed mold 2
5 and the movable mold 27° 28 provided on the upper part of the split mold 26
The split mold 26 is a cylinder 29 on the base 23.
The lower mold 15 is opened and closed by being driven by. And the mobile type 27.28 is the fixed type 25
and drive pins 30 disposed through the split molds 26, respectively.
31, it can be moved up and down. Thus, the flange portion 4b of the workpiece 4 is held between the wrinkle holding plates 20.21 of the pair of wrinkle holding cylinders 18 and 19 and the movable die 27.28. Note that curved recesses 32 and 33 are formed in the inner walls of the fixed mold 25 and the split mold 26 to correspond to the outer peripheral surface of the fuel tank to be molded.

Next, a composite hydraulic press working method for molding a fuel tank using the composite hydraulic press apparatus I having the above configuration will be described. First, in the first step, the workpiece 4 is placed on the lower die 6, and the wrinkle presser cylinder 91O is operated to clamp the end portion of the workpiece 4 between the wrinkle presser temporary 11.12 and the upper surface of the lower die 6. At the same time, the pressure liquid is supplied into the hydraulic pressure chamber 13 of the lower mold 6 to fill the hydraulic pressure chamber 13 with the pressure liquid. In this state,
When the upper mold 5 is lowered and the middle part of the work 4 is pushed into the lower mold by the punch 8, the work 4 is formed by facing hydraulic pressure into a shape consisting of a bottomed cylindrical part 4a and a flange part 4b as shown in FIG. Ru. The workpiece 4 that has passed through the first step is transported to the second step by a conventional transport means.

In the second step, the split mold 26 is brought into pressure contact with the fixed mold 25 by the cylinder 29 in advance to clamp the molding lower mold 15.

Then, the workpiece 4 is placed on the movable die 27.28, and the wrinkle presser cylinder 18.19 is operated to remove the wrinkle presser temporary 20.
．． 2] and movable dies 27, 28 to clamp the flange portion 4b of the workpiece 4 (see FIG. 2). Next, the upper mold 14 is lowered and the bottomed cylindrical portion 4a of the workpiece 11 is pushed downward by the punch 17, so that the bottom of the cylindrical portion 4a is pressed against the bottom surface of the lower mold 15. In this state, while moving the wrinkle presser cylinder 18.19 and the movable die 27.28 downward and pushing the flange portion 4b of the workpiece 4 downward,
Pressure liquid is ejected from the passage 22 of the punch 17 toward the cylindrical portion 4a of the workpiece 4. Accordingly, the cylindrical portion 4a of the workpiece 4 expands the concave portions 32 and 33 of the fixed mold 25 and the split mold 26 to the peripheral surface, and the workpiece 4 is coined and bulged into a tank shape with a constriction (see Fig. 3). reference)
.

After that, the pressure liquid is discharged, and the upper mold 14E and the movable molds 27 and 28 are moved upward, and the split mold 26 is moved to the right in the figure to open the mold.
When compressed air is blown out from the passage 22 of No. 7 toward the cylindrical portion 4a of the workpiece 4, the workpiece 4 hits the punch 1 of the upper mold 14.
7 and taken out from the press molding die 3 (the fourth
(see figure).

According to the above embodiment, the first step of performing opposed hydraulic forming;
Since the fuel tank is integrally molded in the second process of coining molding and bulge molding, processing time can be shortened and costs can be reduced compared to a fuel tank with a split structure.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment described above, and various modifications and changes can be made based on the technical idea of the present invention.

For example, in the above-mentioned embodiments, the fuel tank was integrally molded using the steel plate work 4, but the fuel tank may also be molded using an aluminum material or the like, and it is possible to apply this to molded products other than fuel tanks. Needless to say.

e. Effects of the Invention As described above, the composite hydraulic press forming method according to the present invention separates the workpiece into two steps: the first step of performing opposed hydraulic forming, and the second step of performing coining forming and bulge forming. Since it is integrally molded, the press working cycle time can be significantly shortened and productivity can be improved. Furthermore, the structure of the mold used in the first and second steps is simpler than that of conventional molds, reducing mold costs and making setup easier. In addition, in the processing method of the present invention, after the second step of bulge forming, the movable mold is moved upward relative to the lower mold, and compressed air is supplied from the punch into the inside of the molded member. Therefore, the molding upper mold and lower molding mold can be easily separated from the molded member.
Excellent workability.

[Brief explanation of the drawing]

1 to 4 relate to one embodiment of the present invention, and FIG.
FIG. 2 is a cross-sectional view of the press mold showing a state in which opposed hydraulic pressure forming is performed in the process; FIG. 4 is a sectional view of the press molding die showing the state in which coining forming and bulge forming are performed in the second step, and FIG. 4 is a sectional view of the press forming die showing the state in which the mold is opened at the end of the second step. be. 1... Composite hydraulic press device, 2... Press mold, 3
...Press molding die, 4.Molded member, 5.
... Upper die, 6... Lower die, 8... Molding punch, 9.10... Wrinkle holding cylinder, 11, 12... Wrinkle holding plate, 13... Hydraulic pressure chamber,
14... Upper mold for molding, 15... Lower mold for molding,
17... Molding punch, 18, 19... Wrinkle holding cylinder, 20, 21... Wrinkle holding plate, 22... Passage, 2
5...Fixed type, 26...Split type, 27,
28...Movable type, 30.31...Drive bin, 32, 33...Recessed portion. Figure 1

Claims (1)

[Claims] In the first step, the ends of the workpiece to be formed are held between the wrinkle presser cylinder of the upper mold and the lower mold, and a pressure liquid is supplied into the hydraulic pressure chamber of the lower mold, and in this state, the punch of the upper mold is pressed. In the second step, the end part of the part to be formed which has been subjected to the facing hydraulic pressure forming is moved by the wrinkle pressing cylinder of the upper mold and the lower mold. The bottom of the member to be molded is pressed downward with the punch of the upper mold to press against the bottom of the lower mold, and in this state, the wrinkle presser cylinder and the movable mold are moved downward. While pushing the end of the member to be formed downward, pressure liquid is supplied from the punch of the upper molding die into the inside of the member to be formed to bulge outward, and after discharging the pressure liquid, the forming process is performed. The upper mold and the movable mold are moved upward, and the lower molding mold is divided into left and right parts to open the mold, and at this time, compressed air is supplied from the punch of the upper molding mold into the inside of the molded member to complete the molding. A composite hydraulic press processing method characterized by performing coining forming and bulge forming by separating an upper mold, a lower molding mold, and a member to be molded.