JPH0375247B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for manufacturing a front pillar of an automobile.

(Prior Art) Conventionally, a workpiece having a complicated structure, such as a front pillar of an automobile, is molded or processed using a press device through a plurality of molding steps. In order to carry out the forming process, a plurality of press apparatuses equipped with processing dies corresponding to each forming process are arranged on a forming line, and the workpiece is sequentially passed through each press apparatus to form and process the workpiece. In these forming processes, the operating directions of the processed parts for outer periphery punching and offset hole punching are different vertical and horizontal directions, respectively. If this is done in the same process, the cutting edge near where the cross-hole punch passes must have a flat cross-sectional shape due to timing considerations, but the cutting edge in this state has no durability at all. Therefore, it was not possible to process it without dividing it into two steps.

Nowadays, various industries are calling for energy saving, and the press industry is also reconsidering its various forming processes, and there is a desire to reduce the number of forming processes. Shorten even one process
This is because if it can be omitted, there is no need to make an expensive processing mold for one process, which leads to a reduction in costs and allows for a reduction in production time. Japanese Utility Model Application No. 58-4234 proposes to combine the above two steps into one step.

(Problems to be Solved by the Invention) However, in the device disclosed in the above-mentioned publication, when a hole is drilled in an upright wall surface, the outer periphery of the workpiece that is close to the hole to be drilled is close to each other. and cannot be applied. This is because there is no pressure on the upper surface of the periphery of the hole to be drilled, and bending or the like occurs in the periphery during drilling.

In the present invention, the periphery of the hole to be drilled and the outer periphery near the hole are pressed against the lower die during the process of punching the outer periphery of the workpiece and drilling into the rising wall surface, thereby preventing bending, etc. The present invention provides an apparatus for manufacturing an automobile front pillar, which can perform processing with high precision.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides an upper mold that can be raised and lowered with respect to a lower mold, and the upper mold and the lower mold each have a workpiece placed on the lower mold. A cutting edge is provided for punching the outer peripheral edge of the workpiece, and the upper mold is provided with a pad for pressing the work onto the lower mold, and a part of the pad is used for punching the outer peripheral edge of the workpiece near the hole to be drilled. A cam mechanism interposed between the upper mold and the lower mold presses the upper mold against a vertically rising wall near the outer periphery of the work as the upper mold descends. By providing a guide on the sliding surface and a protrusion that slidably engages with the guide, a punch for punching holes having a vertically long cross-sectional shape is provided so as to be displaced obliquely from upward to downward. At the same time, a punch stopper made of an elastic material such as urethane rubber is provided integrally with the punch to press a part of the periphery of the hole to be drilled with the punch, and the punch also has an upper part for punching the outer periphery of the workpiece. It is provided so as to pass directly above the wedge-shaped cross-sectional area of the die cutting blade.

With the above configuration, the outer periphery of the workpiece close to the hole to be drilled is pressed by a part of the pad, and the periphery of the hole to be drilled is pressed by the punch stopper, thereby punching the outer periphery of the workpiece. , and the drilling of a horizontal hole in a portion protruding above the workpiece, which is close to the outer peripheral edge to be punched, can be simultaneously performed in one process. Moreover, if the outer peripheral edge and the horizontal hole are to be close to each other, it is processed in one process, so if the punch is configured to move from the horizontal direction, the thickness of the upper die cutting edge will become extremely thin, making it actually useless. Although it is a device that is difficult to integrate into a single process, if the punch is guided by a cam mechanism and is configured to move diagonally from above to below toward the rising part of the workpiece, the upper cutting edge The cross-sectional shape is wedge-shaped, which makes the upper die cutting edge strong and able to withstand punching, making it possible to achieve a one-step process.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings, taking a process of molding a front pillar of an automobile as an example.

FIG. 1 shows a press processing apparatus according to the present invention, and illustration of the press apparatus is omitted. The processing die 1 is roughly composed of a lower die 2, an upper die 3, a pad 4, a cam mechanism 5, and a matching hole punch 6.

The lower mold 2 is fixed to a holster, for example,
Its upper end surface has a predetermined shape so that the workpiece 8 (see FIGS. 6 and 7) formed in the previous drawing process is placed thereon, and the lower die cutting edge 9 is placed on the upper end surface.
is provided. A through hole 11 for discharging scrap is opened at a position corresponding to removing the cross-hole of the lower die 2, for example, a position corresponding to removing the door check hole 10 (see FIG. 8).
1 is connected to a discharge chute (not shown).

The upper die 3 is fixed above the lower die 2 to a press ram (not shown) that is vertically displaced.
2 is open downward. An upper cutting edge 15 is provided around the hole. An extending portion 13 is provided on the side wall of this upper mold 3, and the extending portion 1
3 extends away from the hole 12 from the top to the bottom. A notch 14 is formed in the side wall of the upper die 3 below the extension 13, and the notch 14 penetrates into the hole 12 from the outside. The lower surface of the notch 14 is inclined toward the hole 12, and this inclined surface constitutes the upper surface of the upper mold cutting edge 15. The upper die cutting edge 15 and the lower die cutting edge 9 work together to punch out the outer peripheral edge of the workpiece 8 placed on the lower die 2. Particularly below the notch 14,
The upper die cutting edge 15 formed on the upper die 3 has a wedge-shaped cross section that becomes thicker as it moves away from the hole 12. By having such a shape, the strength of the cutting edge during punching is ensured.

A pad 4 is provided within the hole 12. This pad 4 is held by the upper mold 3 via a spring 16, and when the upper mold 3 is spaced above the lower mold 2, the lower end surface of the pad 4 is approximately the same as the lower end surface of the upper mold 3. They are located at the same position or protrude slightly downward from the lower end surface of the upper die 3. The lower end surface of this pad 4 has a shape corresponding to the upper end surface of the lower die 2, and the workpiece 8 is pressed and held between the lower end surface of the pad 4 and the upper end surface of the lower die 2. An auxiliary pad 4' is integrally attached to the side surface of the pad 4 for pressing the outer peripheral edge of the workpiece in the vicinity of the protruding hole.

The cam mechanism 5 includes a slide pace 17, a passive cam 18, and a cam bottom 19. The slide space 17 is fixed to the extension part 13, and its lower end surface extends in the same direction as the extension part 13. The passive cam 18 is held by a pair of guides 20 (third
(see figure), this passive cam 18 is restricted from being displaced beyond a predetermined value by a stopper 21 attached to the end of the extension portion 13. A spring 22 is interposed between the driven cam 18 and the upper mold 3, and the driven cam 18 is biased toward the stopper 21 by the spring 22. The lower end surface of the passive cam 18 is inclined so as to approach the lower mold 2 from the top to the bottom, and a groove 23 is provided on the lower end surface extending in the same direction as the direction in which the lower end surface is inclined. (5th
), the lower end of the passive cam 18 has the passive cam 1
A pair of protrusions 24 are provided that protrude in a direction perpendicular to the direction in which the lower end surface of the plate 8 is inclined.

The cam bottom 19 is fixed to the lower mold 2 below the passive cam 18. This cam bottom 1
A protrusion 19a is formed on the upper end surface of the driven cam 18 in correspondence with the groove 23 of the driven cam 18, and the protrusion 19 extends in the same direction as the direction in which the groove 23 extends. A pair of guides 25 for guiding the protrusion 24 are attached to the cam bottom 19,
The functions of this pair of guides 25 will be described later along with their actions.

The cross-section of the hole punch 6 has a rectangular shape that is long in the vertical direction, and has a base 27 and a base 27.
The base 27 is attached to the tip side of the passive cam 18 (lower die 2 side in FIG. 1), and the tip 28 passes through the notch 14. It is facing hole 12. Tip part 2
An expandable punch stopper 29 made of polyurethane rubber or the like is attached to the 8, and when no force is applied to the punch stopper 29, the punch stopper 29 is placed on the lower die 2 side from the tip end surface of the tip end 28. The tip surface is protruding.

Next, the effect will be explained.

In order to form the front pillar, first, a material is formed into a workpiece 8 of a predetermined shape using a processing die in the drawing process (see Fig. 6), and the workpiece 8 that has undergone the drawing process is placed on the lower mold 2. . That work 8
In the drawing process, as shown in FIG. 7, the work 8 is drawn deeper by l ₁ = 15 to 20 mm than the conventional work 8', and the wrinkle pressing surface 8a of the work 8 is
= It is tilted deeply by 20 to 30 degrees.

When the workpiece 8 is placed on the lower die 2, the upper die 3 is lowered. Along with this, the pad 4 and the passive cam 18 are lowered, and the pad 4 and the lower die 2 cooperate to hold the workpiece 8, and the passive cam 18 comes into contact with the cam bottom 19 (see Fig. 1). . At this time, the protrusion 24 of the passive cam 18 is connected to the pair of guides 25.
Not yet engaged.

The upper mold 3 further descends, but the upper mold 3
The pad 4 only presses down and descends, and the pad 4 does not displace while pressing the work 8. In this state, the auxiliary pad 4' presses the lower peripheral edge of the hole to be punched, and the punch stripper 29 is in contact with the peripheral edge of the hole to be punched. On the other hand, since the extension part 13 pushes the passive cam 18 downward as the upper mold 3 descends, the passive cam 1 guided by the cam bottom 19
8 and the punch 6 are displaced obliquely from above toward a portion rising above the workpiece 8 placed on the lower mold 2, and the protrusion 24 of the passive cam 18 is connected to the pair of guides 2.
Therefore, as the passive cam 18 is displaced toward the workpiece 8, the matching hole punch 6 compresses the punch stopper 29 and punches the matching hole at a predetermined position of the workpiece 8, that is, the door check hole. 10 reliably with a small stroke,
The scrap of the workpiece 8 resulting from the punching is led to the discharge chute through the through hole 11. At this time, the upper die cutting blade 15 provided on the upper die 3 and the lower die cutting edge 9 provided on the lower die 2 work together to remove the workpiece 8.
The outer periphery is cut out into a predetermined shape (see Fig. 2).

When the outer periphery of the workpiece 8 and the offset hole punching are completed, the upper die 3 starts to rise, but at this time, the protrusion 24 of the passive cam 18 is engaged with the pair of guides 25, and the passive cam 18 is Since it is urged toward the stopper 21 by the spring 22, the passive cam 18 is guided by the cam bottom 19 and comes into sliding contact with the cam bottom 19 as the upper die 3 rises. When the passive cam 18 slides until the protrusion 14 of the passive cam 18 and the pair of guides 25 are disengaged, the matching hole punch 6 exits from the through hole 11.
After this, the passive cam 18 and the hole punch 26 will rise in accordance with the rise of the upper die 3. At this time, the passive cam 18 is in contact with the stopper 21 due to the bias of the spring 22. Then, as shown in FIGS. 8 and 9, the workpiece 8 that has been subjected to the outer circumferential edge punching and the offset hole punching is taken out from the lower mold 2 and is transferred to the next step, the cornering step.

In the bending process, the workpiece 8 is formed by a predetermined processing die as shown in FIG. 10, and the entire process is completed. In this way, conventionally, punching the outer peripheral edge of the workpiece 8 and punching the offset hole were performed in separate processes, and the punch for the offset hole was provided in the lower mold, so the total process was four steps. In the example, the total number of steps is reduced to three.

(Effects) As described above, the present invention allows the punch to move downward in an oblique direction against a wall that rises close to the outer periphery of the workpiece as the upper die descends. Since the punch is provided so as to be guided by the upper part, the punch can be installed on the upper die.Furthermore, since the upper die cutting edge is provided below the punch with a wedge-shaped cross section, it is possible to punch out the outer periphery and cut the raised part of the workpiece. Even if the distance between the hole and the hole is close, it can be processed with one operation of the press machine, and the outer edge of the workpiece near the hole to be drilled can be pressed with a part of the pad and the outer edge can be hammered. At the same time as punching, the periphery of the hole to be offset is punched by pressing it with a punch stopper made of an elastic material such as urethane rubber, which prevents shaking of easily deformed parts and allows highly accurate machining without bending. can. Therefore, punching of the outer peripheral edge of the workpiece and punching of the offset hole can be performed at the same time, and the total number of conventional molding processes can be reduced.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a processing die according to the present invention;
Fig. 2 is an operating state diagram of Fig. 1, Fig. 3 is a sectional view taken along the line A-A of Fig. 2, Fig. 4 is a sectional view taken along the line B-B of Fig. 2, and Fig. 5 is a sectional view taken along the line B-B of Fig. 2. 6 is an enlarged perspective view showing the workpiece after the drawing process in forming the front pillar, FIG. 7 is a simplified sectional view taken along the line D-D in FIG. 6, and FIG. FIG. 9 is an enlarged perspective view showing a workpiece processed by such a processing die, FIG. 9 is a perspective view seen from the E direction of FIG. 8, and FIG. 10 is an enlarged perspective view showing the workpiece after a bending step. 1...Processing die, 2...Lower die, 3...Upper die, 4...
...Pad, 4'...Auxiliary pad, 5...Cam mechanism,
6... Punch for stocking holes, 8... Workpiece, 24...
Projection, 25...Guide, 29...Punch stopper.

Claims (1)

[Claims] 1. An upper mold is provided so as to be movable up and down relative to the lower mold, and each of the upper mold and the lower mold is provided with a cutting blade for punching the outer periphery of a workpiece placed on the lower mold, and the upper mold has a lower mold. A pad for pressing the workpiece is provided on the mold, and a part of the pad is provided so as to press the outer peripheral edge of the workpiece near the hole to be drilled, and as the upper mold is lowered, the workpiece is pressed. A guide and a protrusion that slidably engages with the guide are provided on a sliding surface of a cam mechanism interposed between the upper mold and the lower mold on a vertically rising wall near the outer peripheral edge. By providing each punch, a punch for punching a hole with a vertically long cross-sectional shape is provided so as to be displaced diagonally from upward to downward, and integrally with the punch, a part of the periphery of the hole to be bored by the punch is provided. A punch stopper made of an elastic material such as urethane rubber is provided for pressing the workpiece, and the punch is configured to pass directly above the wedge-shaped cross-sectional area of the upper cutting edge for punching the outer periphery of the workpiece. 1. An automobile front pillar manufacturing device, characterized in that it is installed in a vehicle.