JPH0313234A - Press forming equipment for flange working - Google Patents

Abstract

PURPOSE:To curtail the manhour for manufacturing a die and to relax the spatial constraint of the lower die side by attaching a lifter block for abutting on the end face of a flange part and pushing up the flange part concerned, while coming into slide-contact with the outside peripheral surface of the lower die at the time when the upper die ascends, to a die so as to be rotatable. CONSTITUTION:When the upper die 5 descends, a knockout pin 7 abuts on a work W, and while the pin concerned 7 is moving upward relatively, a pad 4 pressurizes and constrains the work W. Subsequently, the tip of a lifter block 10 abuts on the peripheral edge part of the work W and the block 10 rotates clockwise in accordance with a descending operation of the upper die 5 and moves upward. As a result, the block concerned 10 rotates clockwise again at the time point when it gets over the peripheral edge part of the work W, and goes into the lower side than the peripheral part of the work W. When the upper die 5 further descends, a sectional die 2 is engaged to an edge part 1a of a punch 1 and a flange part is formed in the work W. After forming of the flange part is completed, the upper die 5 starts to ascend, an auxiliary block 12 abuts on the tip face of the flange part and the work W is pushed up gradually.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a press forming apparatus for the purpose of flange bending of the peripheral edge of a workpiece, particularly flange down processing. The present invention relates to a press molding device equipped with a flange lifter function to release the mold from the lower mold.

BACKGROUND OF THE INVENTION An example of this type of press forming apparatus equipped with a flange lifter is the structure shown in FIG. 5 (a similar structure is disclosed in, for example, Japanese Utility Model Publication No. 58-6591). In the figure, 31 is a punch, 32 is a sectional die fixed to the upper holder 33, 34 is a pad that is elastically supported by the upper holder 33 via an elastic body so that it can move up and down, and a flange lifter is attached to the side of the punch 31. 35 are provided.

The flange lifter 35 has a lifter guide 37 movably mounted on a holder portion 36 protruding from the punch 31, and a lifter plate 3 on the upper surface of the lifter guide 37.
8 is fixed, and a leading bin 39 facing this lifter plate 38 is integrally fixed to the sectional die 32. 40 is a compression coil spring that applies an upward biasing force to the lifter guide 37, and 41 is a stopper.

Then, as the upper holder 33 descends, the work W positioned on the punch 31 is pressed and restrained by the pad 34, and as the upper holder 33 continues to descend, the punch 31 and the sectional die 32 cooperate with each other. As a result, the peripheral edge of the work W is bent downward at a substantially right angle to form a flange F.

At this time, after the pad 34 pressurizes and restrains the work W, in the process of the sectional die 32 descending, the lifter plate 3
8 is pushed down by the preceding bin 39, and when the sectional die 32 reaches the lowering limit position, the lid plate 38
is located below the flange portion F as shown in FIG.

After this, when the upper holder 33 rises again, the lifter plate 38 also rises, and after waiting for the pad 34 to separate from the workpiece W, the lifter plate 38 moves to the flange portion F.
The workpiece W is pushed up to a position where the tip surface of the lifter plate 38 is substantially flush with the upper surface of the punch 31 as shown in FIG.

The wire W pushed up by the flange lifter 35 is further pushed up to a predetermined height position by a main lifter (not shown) and then carried out of the mold.

Problems to be Solved by the Invention In the conventional structure as described above, the flange shifter 3
5, the sliding parts between the lifter plate 38 and the punch 31 and the sliding parts between the holder part 36 and the lifter guide 37 require a relatively high degree of surface roughness precision, making the machining troublesome. In addition to increasing the number of mold manufacturing steps, the installation space for the flange lifter 35 and the relatively large dimensions for its lift stroke must be secured, which places restrictions on the installation of other press mold related parts.

For example, as shown in FIG. 6, when the above-mentioned flange bending process and piercing hole punching using the piercing punch 42 are performed at the same time, it is essential to install a scrap chute 43 for scrap processing of the piercing hole punching. If the flange lifter 35 is installed on the side of the punch 31 as shown in the figure, the scrap chute 43 and the flange softer 35
This interferes with the scrap chute 43, making it impossible to install the scrap chute 43. As a result, the piercing hole has to be processed in a separate process (this results in an increase in the number of processing steps).

The present invention has been made in view of the above points, and its purpose is to solve the problems of the conventional flange lifter by substantially providing the function of the flange lifter on the upper mold side. There is a particular thing.

Means for Solving the Problems As described above, the present invention involves bending the periphery of the workpiece downward at a substantially right angle and bending the flange by the cooperation of the upper mold and the lower mold consisting of a die and a pad. In press forming equipment, when the upper mold is lowered, it contacts the peripheral edge of the workpiece that is to become the flange, and rotates upward and enters below the peripheral edge of the workpiece, while when the upper mold is raised, the lower mold is The present invention is characterized in that a lifter block is rotatably attached to the die, the lifter block slidingly contacting the outer peripheral surface and abutting against the end face of the flange to push up the flange.

Function: According to this structure, the lifter block is supported by the die and moves up and down with the die, thereby functioning in the same way as a conventional flange lifter. Moreover, since there is no equivalent to the conventional holder part on the lower mold side, space constraints are alleviated.

Embodiment FIG. 1 is a diagram showing a more specific embodiment of the present invention.
2 is a sectional die fixed to the upper holder 3; 4 is an elastic body (not shown) attached to the upper holder 3;
The sectional die 2 and the pad 4 are connected to the upper die 5.
is configured.

A knockout bin 7 is provided on the pad 4 and is movable up and down, to which a downward biasing force is applied by a compression coil spring 6.

On the other hand, a bifurcated holder 8 is formed on the sectional die 2 to protrude downward, and a hinge bin 9 is formed on this holder 8.
A lifter block 10 is provided via. The lifter block IO is composed of a latch block 11 that is rotatably supported by a holder 8 via a hinge bin 9, and an auxiliary block 12 that is slightly slidably installed at the tip of the latch block 11. 12
is urged by a compression coil spring 13 and at the same time is prevented from being pulled out by a stopper 14, and furthermore, the upper and lower surfaces of its tip are chamfered. The lifter block 1o is prevented from rotating counterclockwise (downward) from the horizontal state in FIG. 1 by a stopper 15 formed on the holder 8.

In the press forming apparatus configured in this way, the second
As shown in the figure, when the upper mold 5 is raised, the beam lid block 10 maintains its horizontal state by its own weight.

When the upper die 5 descends, the knockout bin 7 first comes into contact with the workpiece W, and as the knockout bin 7 moves upward relatively, the pad 4 pressurizes and restrains the workpiece W, as shown in FIG. At this time, the tip of the lifter block 10 is at the 7th rung part F.
The lifter block 10 comes into contact with the peripheral edge of the workpiece W to be formed, and rotates clockwise in response to the lowering movement of the upper mold 5 and moves upward. As a result, the lifter block 10 rotates clockwise again when it gets over the peripheral edge of the workpiece W.
As shown by the imaginary line P in FIG. 3, it enters below the peripheral edge of the workpiece W.

When the upper die 5 continues to descend, the sectional die 2 engages with the edge portion 1a of the punch L, as shown in FIG. 1, and the peripheral edge of the workpiece W is bent downward at a substantially right angle to form a flange portion F. .

After completing the molding of the flange portion F, the upper mold 5 has reached the lowering limit position.
When the auxiliary block 12 begins to rise again, the lifter block 10 returns to the horizontal state as shown in FIG. It rises with 5.

Then, the sectional die 2 is attached to the edge portion 1a of the punch 1.
Waiting for the pad 4 to separate from the workpiece W, the auxiliary block 12 comes into contact with the end surface of the flange portion F and gradually pushes the workpiece W up.

When the workpiece W is pushed up by the auxiliary block 12, the force of the knockout bin 7 pushing down the workpiece W is acting at this time, so the auxiliary block 12 climbs over the flange part F as shown in FIG. The workpiece W is left on the punch 1 side and moves up together with the upper mold 5.

In this way, according to the structure of the above embodiment, the only dimension required on the lower die side for the flange lifter function is the q dimension, which is significantly smaller than the conventional one, and therefore the scrap chute 43 as shown in FIG. Even when placing an unreasonable amount on the punch 1, it can be installed without causing interference with the lifter block 10.

Note that similar effects can be obtained by integrating the latch block 11 and the auxiliary block 12 or by using a lid block.

Effects of the Invention As described above, according to the present invention, the lifter block that pushes up the flange part after flange forming is rotatably attached to the die on the upper mold side, which requires high precision machining unlike the conventional guide block. By reducing the number of parts, it is possible to reduce the number of mold manufacturing steps, and by reducing the size of the lower mold side occupied by the lifter block, there is no restriction on the installation of other press mold related parts, such as scrap chutes. do not have.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing an embodiment of the present invention, with the upper mold at its lowering limit position, Fig. 2 is a cross-sectional view of the upper mold raised before flange forming, and Fig. 3 is the same. Figure 4 is a cross-sectional view of the upper die during its lowering process, Figure 4 is a cross-sectional view of the upper die rising after flange forming, Figure 5 is an enlarged view of the main parts of a conventional flange lifter, and Figure 6 is a diagram of a conventional flange lifter. It is a sectional view of the whole press molding device provided. l...Punch as lower die, 2...Sexiconal die, 4...Pad, butt...Upper die, 8...Holder, 9
... Hinge bin, 10 ... Lifter Pro Tsuk, 11
... U-nochi block, 12... auxiliary professional Tsuku,
1'5- Sto/horn F...flange part, w"'
work. Figure 3 Figure 4 Figure 1 Figure 2 Figure 5

Claims (1)

[Claims] (1) In a press forming machine that bends the peripheral edge of a workpiece downward at an almost right angle to form a flange part by working together with an upper mold and a lower mold consisting of a die and a pad, the flange part is bent when the upper mold is lowered. When the upper mold comes into contact with the peripheral edge of the workpiece, it rotates upward and enters below the peripheral edge of the workpiece, while when the upper mold is raised, it comes into contact with the end surface of the flange part while slidingly contacting the outer peripheral surface of the lower mold. A press-forming device for flange processing, characterized in that a lifter block that contacts and pushes up the flange portion is rotatably attached to the die.