JPH0787944B2 - Pressing method for amorphous hollow section members - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a method for pressing a hollow member, in particular, an irregular hollow cross-section member.

<Prior Art> Various hollow cross-section members such as reinforcements are used for vehicle body components. This hollow section member is formed by pressing a sheet metal material. In this press work, when the hollow cross section has a regular shape, it can be formed into a closed cross section shape by one sheet metal material, but it cannot be formed in the case of an irregular shape. Therefore, conventionally, as shown in FIG. 10, a member 1a having a flange 2 and having the same shape divided into two,
1b was formed and the flange 2 was welded to form a hollow cross-section member.

<Problems to be Solved by the Invention> According to the hollow cross-section member with the flange, the flange and the wire harness interfere with each other to damage the wire harness at the portion where the wire harness is wired, or the assembling work of the hollow cross-section member is performed. There is a problem that the flange will be scratched if it is touched by the hand at the time of vehicle maintenance or inspection. Further, the hollow sectional member having the two-divided structure is inferior in torsional rigidity as compared with the integrally processed hollow sectional member.

An object of the present invention is to solve the above conventional problems.
The present invention provides a press working method capable of integrally working an irregular hollow cross-section member.

<Means for Solving Problems> The present invention for achieving the above-mentioned object is a method for pressing a hollow member having a bent portion in the longitudinal direction and having an indefinite cross-section, and a method for forming a molded product. A step of forming a sheet metal material, which is punched out in an expanded shape, into a substantially hat-shaped cross section, and a mold of a shape for molding the brim portion of the substantially hat-shaped cross section formed in the above step is divided into a plurality of pieces, and this mold is linked. The process is performed by bending and expanding and contracting by means of a spring, and by bending along a core that has been drawn into a mold shape to be formed by a spring to form a hollow cross section. <Operation> By using the above-mentioned special core, it becomes possible to form an indeterminate hollow cross-section member from a single sheet metal material by integral processing.

<Example> An example of the present invention will be described below with reference to Figs. 1 to 9. First, the outline of the molding process will be described with reference to FIG.
As shown in the first step of FIG. 1 (A), a work W made of a sheet metal material is punched out into an expanded shape of a product to be molded, and this is cut into a substantially hat shape as shown in the second step of FIG. 1 (B). Stamped into a cross section.

Although it is possible to move from this second step to the fourth step of FIG. 1 (D), which is the most important element of the present invention, depending on the irregular hollow cross-sectional shape of the molded product, it is necessary to improve the quality as shown in FIG. In some cases, the process may move to the fourth process after the third process of c).

In this third step, the brim-shaped portion 10 of the workpiece W having the substantially hat-shaped cross section formed in the second step is bent inward to form a curved cross section to facilitate the processing in the fourth step.

In the fourth step, the collar-shaped portion 10 of the work W having a substantially hat-shaped cross section formed in the second step by using a special core 18 described later is used as the core.
Bent along 18 to make a hollow section member. In addition, when the third step is performed, the work mouth W having the curved cross section is moved to the fourth position.
The hollow cross-section member is closed in the process. Therefore, the third step is adopted as necessary and is not an essential constituent feature of the present invention.

The work W that has completed the fourth step has an abutting portion 11 by bending.
Are welded, but this may be left as it is for those which do not require welding. .

2 and 3 show an example of the forming process of the second step, in which the press machine 13 forms the work W having a substantially hat-shaped cross section with the collar-shaped portion 10 by the upper die 12a and the lower die 12b.

FIG. 4 and FIG. 5 show an example of a third step which is adopted as needed. The lower die 15 and the upper die 16 are used by the press machine 14 to move the collar-shaped portion 10 of the work W having a substantially hat-shaped cross-section inside. Bend in one direction to form a curved cross section.

6 to 9 show the most important component of the present invention, which is the fourth step because the third step is adopted in the above description.
This will be described with reference to the figure.

In FIG. 6, 18 is a core. As shown in FIG. 9 (A), this core 18 divides the mold of the shape of the product work W having an indefinite hollow cross-section member into a plurality of molds 18a and 18b, and divides the divided molds 18a and 18b into a plurality of molds. The links 19a, 19b, 19c are connected so as to be bendable and extendable.

Further, the spring 20 is coupled to the link 19a, and the tensile force of the spring 20 is used to form the mold 1 via the links 19a, 19b, and 19c.
8b is attracted to the mold 18a to form the shape of the product work W. Incidentally, 26 is a pin attached to the link 19a, and 27 is a guide groove for the pin 26.

The core 18 has a pressing machine 17 as shown in FIGS.
Is equipped with. That is, one end of the mold 18a of the core 18 is a plate 21 that moves forward and backward in the horizontal direction by the cylinder 23 on the support 30 that is installed on the base of the press 17 so as to be able to move up and down.
It is fixed to. Reference numeral 22 is a stopper with which one end of the work W fitted into the core 18 comes into contact, and is fixed on the base,
The core 18 penetrates so that it can move back and forth. Reference numeral 24 denotes a lower die installed on the base, which corresponds to an upper die which is not shown and which moves up and down.

25 in FIG. 8 also shows a core. The core 25 is attached to the upper mold, and the cam 29 contacts the contact member 28 on the base by the descending stroke of the upper mold to move forward and move backward by the spring. The core 25 has a circular shaft shape, and is used when a part of the end of the work W has a cylindrical shape.

Next, the operation of the fourth step will be described. Press machine 17
When the upper mold (not shown) is raised, the support 30 is located at the rising end on the base, and the core 18 is located above the lower mold 24. Therefore, when moving from the second step to the fourth step, the work W having a substantially hat-shaped cross section is set on the lower mold 24.

Further, when transferring to the fourth step after the third step, the work W having a curved cross section is fitted into the core 18 and set. In any of the above, one end of the work W contacts the stopper 22 and is set.

After that, the upper mold (not shown) is lowered to the position shown in FIG.
As shown in FIG. 3A, the lower mold 24 and the core 18 are used to mold a product having a completely indeterminate hollow section member.

The core 18 after the above-mentioned molding is extracted as follows.
Immediately after molding, the state is as shown in FIG. In this state, the cylinder 23 shown in FIGS. 6 and 7 is operated to move the plate 21 backward as shown in FIG. 9 (B). As a result, the core 18 whose one end is fixed to the plate 21 also moves backward together.

At this time, since the work W is in contact with the stopper 22,
18 comes out from the work W. By the way, at the initial stage of the backward movement of the plate 21, the pin 26 slides in the guide groove 27 of the link 19a and only the die 18a moves backward to move the spring 20.
However, the extension link 19a does not move. Therefore, the mold 18b remains stopped at the predetermined position.

Next, as shown in FIG. 9 (C), when the amount of backward movement of the die 18a exceeds the length of the guide groove 27, the pin 26 engages with the rear end of the guide groove 27 and the link 19a moves backward together with the die 18a. To start.

By this backward movement of the link 19a, the other links 19b and 19c are pulled and extended, and the mold 18a and the mold 18b are separated from the coupled state, and the mold 18b can move upward in the bent portion of the work W. Then, it is pulled by the links 19a to 19c and starts moving.

Further, the backward movement of the die 18a progresses, and as shown in FIG. 9 (D), the die 18b allows the posture displacement at the bending portion of the work W by the rotation of the connecting and pivoting portions of the links 19a to 19c, and the die 18b becomes the work. W
When the cylinder 23 is positioned in the middle of passing, the backward movement of the cylinder 23 is stopped, the forward movement is switched, and the original position is returned.

At this time, the mold 18b stopped while passing through the bent portion of the work W interferes with the bent portion of the work W and does not return to its original shape, so that the mold 18b cooperates with the mold 18a to push out the work W. Separated from the stopper 22.

The worker pushes out the work W extruded by hand and inserts it into the core.
Take out from 18.

At this time, as shown in FIG. 9 (E), the links 19a to 19c are in a substantially straight line shape, and the die 18a is self-displaced in its posture to allow the workpiece W to move.
The work W is allowed to be pulled out after passing through the bent portion of.

When the work W has a cylindrical portion, the circular shaft-shaped core 25 provided in the upper mold (not shown) is moved to the work W as shown in FIG. 9 (A) as the upper mold descends. After being inserted into the end portion and molded by the upper die and the lower die 24, the core 25 is pulled out from the end of the work W as shown in FIG. ) It rises with the upper mold as shown by.

Further, after the work W is pulled out from the core 18, the mold 18b is pulled by the links 19a to 19c due to the contraction of the spring 20, and is united with the mold 18a and restored to the original form.

<Effects of the Invention> As described above, according to the method of the present invention, the brim portion of the work formed in the substantially hat-shaped cross-section in the previous step is divided into a plurality of molds of a shape to be molded, and the mold is bent by a link. In addition, since it is connected to be expandable and contracted and bent along the core drawn into the mold shape of the shape to be formed by the spring to form a hollow cross section, an indefinite hollow cross section member that does not straddle a flange is obtained. There is an advantage that the core removal after press molding of a meandering indefinite hollow cross-section member having a bent portion is easily performed by pressing with a single sheet metal material.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a forming step of a pressing method according to the present invention, FIG. 2 is a perspective view showing a concrete example of the second step, FIG. 3 is a sectional view taken along line II-II in FIG. FIG. 4 is a perspective view showing a specific example of the third step, FIG. 5 is a sectional view taken along the line VV of FIG. 4, FIG. 6 is a perspective view of the main components of the fourth step, and FIG. FIG. 8A is a perspective view of a circular core provided in the upper die. FIG.
(E) is a cross-sectional view for explaining the core of the present invention and the order of removing the core, and FIG. 10 is a perspective view showing the structure of a conventional amorphous hollow cross-section member. 18 …… Core, 18a, 18b …… Type, 19a-19c …… Link, 20
...... Spring, 21 ...... Plate, 22 ...... Stopper, 23
……Cylinder.

 ─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Shigeo Nakasone 5293-1, Urago-cho, Yokosuka City, Kanagawa Prefecture Ishikawa Industry Co., Ltd. (56) References JP 62-3827 (JP, A) JP 60- 54124 (JP, B2)

Claims (1)

[Claims] 1. A method for pressing a hollow member having a bent portion in the longitudinal direction and having an indefinite cross-section, the step of forming a sheet metal material having an outer shape in a developed shape of a product to be formed into a substantially hat-shaped cross section. And, the brim-shaped portion of the substantially hat-shaped cross-section formed in the above step is divided into a plurality of molds of a shape to be molded, and this mold is connected by a link so as to be bendable and expandable,
A press working method for an indefinite hollow cross-section member, comprising a step of bending along a core that has been drawn into a mold shape to be formed by a spring to form a hollow cross section.