JPS6229138Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is based on a dish-shaped body whose bottom wall is curved in the opposite direction from the periphery like the body of an air cleaner, by continuous operation of primary and secondary throttles. This invention relates to a molding device that allows easy processing.

For example, an air cleaner for a vehicle consists of a cover a, a body b, and an overelement e as shown in Fig. 5.The body b is shaped like a deep dish, but the center part is raised upwards. It is made by first forming a plate material into a dish shape with a uniform depth using a single-acting press, and then reverse drawing the center part so as to bulge upwards.

During primary processing, the periphery of the plate material w is placed on a blank holder h, which is a part of the upper die, as shown in Figure 6A.
The large-diameter punch P is pressed down while being pressed by the drawing die d, which is a part of the lower die, to form a deep dish shape, but if you try to reverse draw it in this state,
Around the plate material w, there is a blank holder h and a drawing die d.
As the depth changes to become shallower due to reverse drawing, cracks occur in the peripheral wall, resulting in a defective product. The dish-shaped product is removed from the press machine and placed back into the press machine for reverse drawing as shown in the figure (b), and the dish-shaped part is held down by the annular die d' and blank holder h', and the periphery of the material is freed. Then, the center portion is squeezed out from below using a small-diameter punch P'.

For this reason, conventionally two press machines or two
It requires a process, takes time to set up, and has poor workability.

This idea was devised to improve this drawback, and it is used as a device for processing a dish-shaped body in which the peripheral part and the central part of the bottom wall are curved in opposite directions. To provide a forming apparatus which is capable of performing a secondary drawing process on the center part in addition to the drawing process, and which can prevent cracking and damage to the processed material.

Examples thereof will be described below with reference to the drawings.

In FIGS. 1 and 2, reference numeral 1 denotes a square block-shaped punch holder that forms an upper die attached to the ram A of a single-action press, and a similarly square base plate 1a is fixed to the lower surface of the punch holder. A large-diameter cylindrical punch 2 with an annular lower part is fixed to the part, and a thick annular blank holder 3 having an engagement step 3b on the periphery of the lower surface is arranged below the punch holder 1. A plurality of springs 4 passing through the base plate 1a are contracted to the punch holder 1 and are suspended by suspension bolts 5 (however,
(Only one is shown in Fig. 1 to avoid complexity), the head of the hanging bolt 5 is slidably inserted into the vertical hole 6 bored in the punch holder 1, and The lower end annular portion fits into the center opening 3a of the blank holder 3.

Further, front L-shaped empty chambers 7 are provided at the front and rear (up and down in FIG. 2) of the punch holder 1, and locking arms 8 are disposed in these empty chambers 7. It is rotatably supported by a pair of bearing plates 8a that stand upright in the chamber 7, and at the bottom of both sides of each rocker arm 8 there is a long push rod 9a that passes through the base plate 1a and a short push rod that is about half that long. 9b is provided (however, the left-right relationship is reversed on the front and rear sides), and the lower end of the long push rod 9a fits into the through hole 3c provided in the blank holder 3 when not being processed. . Furthermore, cylinder members 10 are arranged on the sides of the shorter push rods 9b in the chamber 7, and each cylinder member 10 is connected to a pressure fluid supply source via a conduit l, and the tips of the piston rods are is equipped with a bifurcated locking block 10a. Reference numeral 11 denotes a cylindrical die holder with a flange, which forms a lower die and is mounted on the bolster B of the press via a block stand 12. At the center of the bottom wall, there is a small diameter die holder whose height is approximately half the height of the holder peripheral wall. A punch 13 is installed and faces the upper large diameter punch 2,
Inside the die holder 11, an annular die 14 and an annular lifter 16 approximately equal to the inner and outer diameters of the lower end annular portion of the large-diameter punch 2 are arranged concentrically, and the die 14 is supported by a plurality of cushion pins 15 so as to be able to rise and fall freely. The lifter 16 is supported so as to be movable up and down by a plurality of lifter pins 17 which are biased upward by a spring 18 embedded in the block stand 12, and when not being processed, the die 14 and the lifter 16 are connected to each other from the bolster B side. Fluid pressure (dictation,
16 to 18 tons) and the spring force of the spring 18 (approximately 250Kg to 300Kg), these surfaces are positioned upward as shown in FIG.
corresponds to the top surface of

FIG. 1 shows a state on the verge of processing, in which a plate material w of a required diameter is placed on an annular die 14, the ram A is lowered, and the blank holder 3 and die 14 clamp and press the plate material w. In this state, if the ram A is lowered, the lower die 14
is supported by a large fluid pressure of 16 to 18 tons, so the die 14 and blank holder 3 do not move at first, but the upper die punch holder 1 descends while compressing the spring 4, and the third As shown in the figure, the lower end annular portion of the large diameter punch 2 lowers the lifter 16 in the lower mold against the spring force of the spring 18, and cooperates with the die 14 to shape the plate material w into a dish shape with uniform depth. Shape.

During this process, the base plate 1a on the bottom surface of the punch holder 1
The long push rod 9a whose lower end is fitted into the through hole 3c of the blank holder 3 will abut against the lower die 14, and its head will protrude into the cavity 7 of the punch holder 1. One end of the locker arm 8 is pushed up and rotated, and the other end of the locker arm 8 is brought into contact with the head of the short push rod 9b.

Then, the lower end of the short push rod 9b comes into contact with the upper surface of the blank holder 3, and the primary deep drawing process is completed.

When the ram A is further lowered with this primary machining completed, the upper die punch holder 1
Since the distance between the die 1 and the blank holder 3 is maintained constant by the long and short push rods 9a, 9b and the rocker arm 8, the blank holder 3 is
4 and descends together with the ram A, and the engagement step portion 3b on the periphery of the lower surface engages with the inner upper edge of the die holder 11 of the lower mold.

In this state, if the ram A continues to descend, the spring 4 will be compressed again and the punch holder 1 will be compressed.
The distance between the push rod 9b and the blank holder 3 becomes narrower, so that the head of the short push rod 9b protrudes into the empty chamber 7, and the locker arm 8 is rotated from the state shown in FIG. 3 in the opposite direction as shown in FIG. The opposite end pushes down the long push rod 9a.
By pressing down the push rod 9a, the lower die 14 is lowered and separated from the periphery of the plate material w.

While performing this operation, the punch holder 1
That is, the large-diameter punch 2 continues to descend together with the ram A, and presses the plate material w, which has undergone the primary processing, toward the small-diameter punch 13 while holding the drawing bottom periphery between it and the lifter 16. Narrow down so that it rises in the opposite direction (upward).

At this time, since the peripheral portion of the plate material w is in a free state, no strain is applied to the material, and the reverse drawing is performed smoothly. When this reverse drawing is completed, the base plate 1
Pressurized fluid is sent to the cylinder member 10 on top a to extend the piston rod and lock the bifurcated locking block 10.
A is inserted into the rising end of the locker arm 8, and the locker arm 8 is locked in the state shown in FIG.

Thus, when the ram A is moved to the upward stroke, the blank holder 3 is initially moved by the expansion action of the spring 4.
remains engaged with the die holder 11 as shown in Fig. 4, the punch holder 1, base plate 1a, large diameter punch 2, etc. rise, and then the entire upper mold including the blank holder 3 rises. Along with this, the die 14 and lifter 16 of the lower mold also rise to their original positions due to the action of the die cution or the spring action of the spring 18, but at this time, the lower end of the long push rod 9a comes into contact with the die 14, and the die 1
4 and the periphery of the processed product as shown in FIG. 4, it is possible to prevent the processed product from being deformed or damaged due to the restoring operation of the die 14.

When the ram A reaches the top dead center, the flow of pressure fluid to the cylinder member 10 is switched, the locking block 10a is moved back, and the locking state of the rocker arm 8 is released to prepare for the next cycle.

As described above, according to this invention, a dish-shaped body in which the peripheral part and the central part of the bottom wall are curved in opposite directions can be machined using a single single-acting machine. It is possible to continuously perform the drawing process of the center part and the secondary process of reverse drawing of the center part, which saves equipment costs, reduces setup time, improves productivity, and reverse drawing process of the center part. During drawing, the annular die of the lower die is pushed away from the periphery of the primary workpiece by the long push rod of the upper die, leaving the periphery free, which prevents stress from being applied to the workpiece and prevents cracks. Reverse drawing can be performed smoothly without any problems, and when taking out the product after processing, the long push rod is in contact with the annular die in the lower mold, and the short push rod is in contact with the blank holder in the upper mold. Since the device is restored with a certain distance between the peripheral part of the product and the lower annular die, deformation and damage to the processed product due to the restoring operation of the annular die can be prevented.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of this invention. FIG. 2 is a plan view below the line XX in FIG. 1. Figure 3 is a longitudinal cross-sectional view during primary processing. Figure 4 is a longitudinal cross-sectional view during secondary processing. FIG. 5 is a schematic cross-sectional view of the air cleaner. FIGS. 6A and 6B are schematic explanatory diagrams of machining conditions by a conventional device. In the figure, 1... Punch holder, 1a... Base plate, 2
...Large diameter punch, 3...Blank holder, 4...
Spring, 5... Hanging bolt, 7... Vacant room, 8
... Locker arm, 9a, 9b ... Push rod, 10 ... Cylinder member, 10a ... Locking block, 11 ... Die holder, 12 ... Block stand, 13 ... Small diameter punch, 14 ... Die, 15 ...
...Cushion pin, 16...Lifter, 17...
lifter pin.

Claims (1)

[Scope of utility model registration request] A base plate 1a and a large diameter punch 2 are attached to the lower surface of an upper punch holder 1 that moves up and down with the ram A, and a blank holder 3 is suspended below the punch holder 1 by a hanging bolt 5, and a plurality of springs 4 are installed between the two. The punch holder 1 has at least one cavity 7, in which a rocker arm 8 is rotatably supported, and the base is positioned below both ends of the rocker arm 8. A pair of long and short push rods 9a and 9b are provided through the plate 1a so as to be movable up and down, and a cylinder member 10 with a bifurcated locking block 10a is provided on the side of the short push rod 9b, and a cylinder member 10 is provided with a bifurcated locking block 10a. 11. A molding device for a dish-shaped body, characterized in that a small-diameter punch 13 is installed inside the molding device 11, and an annular die 14 and a lifter 16 are arranged concentrically so as to be movable up and down.