JPS6339324B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a press device for forming a flange around the entire circumference of a workpiece, and more specifically, a press device for forming a flange on the entire circumference of a workpiece, and more specifically, a press device for forming a flange from the pressing direction and a flange from a negative angle direction with respect to the pressing direction. The present invention relates to a press device for full-circumference flanging that can perform flanging at the same time.

(Prior art) For example, when attempting to perform full-circumference flanging of a workpiece, such as an automobile hood panel, which has both a flange part that is at a positive angle and a flange part that is at a negative angle with respect to the pressing direction, for example, Showa 59-110428
As shown in the above publication, there is a method of using a press die equipped with a bent blade, a flange lifter, a flange lifter, a finger, etc. for pulling out the bent portion, which are moved by a shifting cam method. However, in this case, an undesirable situation occurs, such as the so-called excess flange thickness occurring at the intersection of the offset curved edge and the upward curved edge, that is, the boundary between the positive and negative angle flanging, and the desired quality cannot be ensured. Conventionally, flanging from the pressing direction and flanging from a direction at a negative angle to the pressing direction had to be performed separately using two press devices. Naturally, this is a major cause of increasing equipment costs, decreasing productivity, increasing maintenance costs, etc., and pushing up product costs, and an efficient improvement has been desired.

(Object of the Invention) In view of the above-mentioned problems of the prior art, the present invention is capable of fabricating flanges of a workpiece having both flange portions at positive and negative angles with respect to the press direction using a single press without producing excess thickness. It is an object of the present invention to provide a press device for all-around flanging, which can be executed in one step and which can contribute to reducing product costs.

(Structure of the Invention) This purpose is to provide a passive cam on the lower die main body so as to move forward and backward in the direction of the punch, and to the passive cam, a biasing blade and an arm for pulling out the workpiece preceding it are attached. The passive cam is moved forward with a slight delay by lowering the upper curved blade attached to the upper mold body.
The end portions of the biased blade and the upper curved blade overlap each other, and the biased blade presses the flange portion in the pressing direction, and the workpiece can be pulled out by the arm and a flange lifter provided on the side of the punch. This is achieved by a press device configured as shown in FIG.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 1 shows the main structure of a press device for full circumference flanging according to the present invention. In the figure, 1 is a lower mold body installed on a bolster 2, and a punch 3 and a cam base 4 are arranged on the upper surface thereof. The cam base 4 has an inclined surface 4a formed at its upper part, on which a passive cam 6 guided by a guide bar 5 is slidably mounted. passive cam 6
has an inclined surface 6a at its rear end, and is always kept at the rear (left side in the figure) by means of a spring (not shown).
is being energized. Further, at the front end of the passive cam 6, there is a bent blade 7 that performs flanging in a negative angle direction with respect to the pressing direction, which will be described later, and an arm that is located in front of the bent blade 7 and that pulls out the workpiece after forming. 8 is installed.

Further, on the side of the punch 3 excluding the part where the passive cam 6 is installed, a workpiece positioning gauge 10 that is moved up and down by a cylinder 9 and a flange lifter 11 that discharges the workpiece after forming are installed in parallel. In addition, a lifter 13 for lifting a workpiece is disposed in the center, and is moved up and down by a cylinder 12.

On the other hand, the upper mold body 16 fixed to the ram 14 via the upper mold stand 15 has a U-shaped upper curved blade 17 that engages with three sides of the punch 3 to perform flanging from the press direction. At the same time, a fixed cam 18 is attached to the side thereof at a position facing the cam base 4. The fixed cam 18 has a slope 1 at its tip that follows the slope 6a at the rear end of the passive cam 6.
8a, and a sliding plate 19 is fixed thereto,
Following the descent of the ram 14, the sliding plate 19 is brought into sliding contact with the inclined surface 6a of the driven cam 6, and the driven cam 6 is advanced toward the punch 3 side.

In addition, 20 is a pad built into the upper mold body 16, which plays the role of pressing a workpiece to be described later onto the punch 3, and 21 is a front guide chute,
Reference numeral 22 denotes a rear guide chute, which plays the role of supplying the workpiece into the mold and discharging the workpiece from the mold, respectively.

With such a configuration, the workpiece W now fed into the mold by the front guide chute 21 is
It is positioned on the punch 3 by a gauge 10 and a rear gauge (not shown). Next, Ram 14
When the pad 20 lowers, the workpiece W is punched 3.
After pressing upward, the upper curved blade 17 engages with the punch 3 and flanging from the pressing direction begins.
At almost the same time, the fixed cam 18 engages with the driven cam 6 to advance the driven cam 6, and with a slight time delay from the flanging from the pressing direction, the fixed cam 18 engages with the driven cam 6, and with a slight time delay from the flanging from the pressing direction, the offset blade 7 forms a negative angle with respect to the pressing direction. Flanging starts from the direction.

After flanging is completed, the ram 14 rises,
First, the flange lifter 11 disposed on three sides of the punch 3 rises and lifts out the flange portion of the formed workpiece W onto the surface of the punch 3, and then as the passive cam 6 retreats, the arm 8 lifts the workpiece W. is pulled out from punch 3. The drawn-out workpiece W is lifted by the lifter 13 and discharged from the mold via the rear guide chute 22 by a mounting device (not shown), thus completing one process of full-circumference flanging. .

Figure 2 schematically shows the state of the workpiece during the above series of processing steps _.
is the workpiece at bottom dead center, W ₂ is flange lifter 1
The workpiece delivered by 1, W ₃ is arm 8
respectively represent the workpieces pulled out from the punch 3. However, the workpiece W ₁ in the bottom dead center state
The angle α between this and the discharged workpiece W ₂ falls within the range of elastic recovery, so that the desired shape of the workpiece is ensured.

Here, the side-curved blade 7 and the upper-curved blade 17 have a rising protrusion 7 at the end of the blade, as shown in an enlarged view in FIG.
a and the front protrusion 17a are formed to face each other. As a result, when the side-curved blade 7 is approached from the side as shown by arrow B to the upper curved blade 17 that descends from above the punch 3 as shown by arrow A, the side-curved blade 7
The inner surface 7'a of the rising protrusion 7a engages with the side surface 3a of the punch 3 (represented by diagonal lines in the figure), and at this time,
The rising protrusion 7a of the offset curved blade 7 and the front protrusion 17a of the upper curved blade 17 are in a lapped state with each other, and as a result, excess thickness is generated at the boundary (corner) of the flange formed on the workpiece W. is regulated. In addition,
The curved blade 7 engages its upper surface 7b with the back surface 3b of the punch 3 to perform flanging from a negative angle direction with respect to the pressing direction.

FIGS. 4a to 4c show the flanging operation of the above-mentioned side-curved blade 7 and upper-curved blade 17 in more detail. From this point on, the workpiece W set on the punch
In contrast, the upper curved blade 17 approaches first, and the side curved blade 7 approaches a little later than a. Subsequently, the upper curved blade 17 performs flanging on the workpiece W from the press direction, and the flange portion is attached to the workpiece W.
Form W′ b. At almost the same time, the bent blade 7 performs flanging from a negative angle direction with respect to the press direction, forming a flange W'' on the workpiece W, and at this time, the boundary of the flanging has a predetermined length L. A lap state appears (c), and due to the emergence of such a wrap state, there is no excess wall thickness of the flange portion to be formed at the boundary portion.

(Effects of the Invention) As described above in detail, the press device according to the present invention has a bent blade that performs flanging from a negative angle direction with respect to the pressing direction, and a bent blade that performs flanging from the pressing direction. In addition to organically arranging the upper curved blade, a means is also provided to take out the workpiece after forming. It is now possible to process all-around flanging in one process, which previously had to be done in two processes, which reduces equipment investment costs, reduces maintenance costs, and shortens setup time. Through this, productivity was improved and other effects were achieved. This naturally serves as a basis for lowering product costs, and the quality of the press is the same as that of conventional presses, so the value of using this press is extremely high.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the main structure of the press device for full circumference flanging according to the present invention, Fig. 2 is a schematic diagram showing the state of the workpiece during press processing, and Fig. 3 is a cross-sectional view showing the bent blade and FIGS. 4A to 4C are perspective views showing the shape of the terminal end of the upper curved blade and the state of the flanging boundary. FIGS. DESCRIPTION OF SYMBOLS 1...Lower die main body, 3...Punch, 6...Passive cam, 7...Bent edge, 8...Arm, 11...Flange lifter, 16...Upper die main body, 17...Upper curved blade, 18...Fixed cam.

Claims (1)

[Claims] 1. A passive cam provided on the lower mold body so as to be able to move forward and backward in the punch direction, a bent blade attached to the front end of the passive cam and performing flanging from a negative angle direction with respect to the press direction, and the biased cam. A workpiece extraction arm located in front of the curved blade and attached to the passive cam, a workpiece extraction flange lifter disposed on a side of the punch excluding the side where the passive cam is installed, and a workpiece extraction flange lifter attached to the upper mold body. In a press device for full-circumference flanging, which includes an upper curved blade that performs flanging in the press direction, and a fixed cam that is attached to the upper mold body and engages with the rear end of the passive cam to advance the passive cam. , a front protrusion projecting toward the upper curved blade is provided at the terminal end of the upper curved blade, and the terminal end of the upper curved blade wraps around the front projection in the vertical direction and is formed by the upper curved blade. A press device for full-circumference flanging that is provided with a rising protrusion that has a flange pressing surface on the inside.