JPH0231609B2 - ROORUSEIKEISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll forming apparatus for forming, for example, a tapered plate material having an irregular cross section whose cross-sectional shape changes in the longitudinal direction.

In the automobile industry, tapered plate materials whose cross-sectional shape changes in the longitudinal direction are used, such as wide door frames and belt moldings with irregular cross sections. Conventionally, for example, as shown in FIG.
When forming a tapered plate material 1 having a cross-sectional shape having curved portions 1c and 1b and a curved portion 1c at the middle portion in the width direction, each portion was sequentially processed mainly using a hydraulic press device. Therefore, in such a conventional method, there was a problem that the processing efficiency was poor because the pressing process was repeatedly performed.

The present invention has been made in view of this point, and an object thereof is to provide a roll forming apparatus that can form a tapered plate material having an irregular cross section with high precision and high efficiency.

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIG. 2, stands 3 and 4 are installed facing each other on a base frame 2 at a required interval, and between the stands 3 and 4, a driving device 5 provided on one side of the stand 3 is used. The upper and lower drive shafts 6, 7 that are rotatably driven are supported by bearings 8 at predetermined intervals, and the ends of the upper and lower drive shafts 6, 7 on the side of the stand 3 are formed with a plate material whose movement in the axial direction is restricted. Fixed roll pieces 9 and 10 for plate forming are provided in the middle of the drive shafts 6 and 7, and movable roll pieces 11 and 12 for sheet material forming are provided in the middle of the drive shafts 6 and 7, and are movable in the axial direction. At the side end of the stand 4, there is a guide roll piece 14 that holds the sheet cam 13 from above and below for moving the movable roll piece 11 in the axial direction.
15 will be provided.

The sheet cam 13 engages with a protrusion 15a provided on the guide roll piece 15 and moves the guide roll piece 1.
4 and 15, and has an engaging groove 13a in the longitudinal direction of the lower surface (direction perpendicular to the plane of paper in FIG. 2), and engages with the flange 11a at the side end of the stand 4 of the moving roll piece 11 a guide groove 13 for moving the movable roll piece 11 in the axial direction
b in the longitudinal direction of its upper surface. Note that the guide groove 13b of the seat cam 13 has an inclination in the direction of moving away from or approaching the stand 4 from the leading end toward the rear end in the advancing direction. Further, the movable roll piece 12 is provided with a groove 12a that engages with the engagement protrusion 11b of the movable roll piece 11. Therefore, when the movable roll piece 11 moves in the axial direction along the guide groove 13b of the sheet cam 13, the movable roll piece 12 is also configured to move integrally in the axial direction.

In the roll forming apparatus of the present invention having such a configuration, when the drive device 5 is now driven, the drive shaft 6,
7 is driven, and integrally with this, fixed roll pieces 9,
10, moving roll pieces 11 and 12, and guide roll pieces 14 and 15, respectively, rotate. At this time,
When the plate material 1 is inserted between the roll pieces 9 and 11 and the roll pieces 10 and 12, and the sheet cam 13 is inserted between the guide roll pieces 14 and 15, the movable roll piece 11
Since the flange 11a of the sheet cam 13 moves along the inclined guide groove 13b, the movable roll piece 1
1 and 12 move integrally on the drive shafts 6 and 7 through engagement between the protrusion 11b and the groove 12a. Therefore, the distance between the roll pieces 9, 10 and the roll pieces 11, 12 changes depending on the engagement position between the guide groove 13b and the flange 11a, and the width of the plate 1 formed by passing therethrough also changes as described above. As a result, the plate material 1 is formed into a tapered shape. That is, guide groove 1
The plate material 1 is tapered in accordance with the inclination angle of the plate 3b.

Next, using three roll forming apparatuses of the present invention,
The process of forming the tapered plate material 1 as shown in FIG. 1 will be specifically explained. Here, for example, the third
As shown in the figure, it is assumed that the roll pieces 9 to 12 of each roll forming device A, B, and C are shaped to form both ends of the plate material 1 as shown in FIG. 4 A, B, and C, respectively. A case where A, B, and C are arranged on the same line will be described. First, roll pieces 9, 11 and roll pieces 10, 1 of roll forming device A
A flat plate material 1 having a predetermined width is inserted between the rollers 2 and 2, and at the same time, the sheet cam 13 is inserted between the guide rolls 14 and 15. Accordingly, the plate material 1 is processed by the movement of the movable roll pieces 9 and 12 into a state in which the flanges 1a and 1b are relatively raised as shown in FIG. At this time, since the seal cam 13 is also sent to the roll forming apparatus B in synchronization with the plate material 1, the sheet material 1 is bent in the same width state in the roll forming apparatus B as well. That is, the flange portions 1a and 1b are further bent as shown in FIG. 4B. The plate material 1 that has passed through the roll forming device B is sent to the roll forming device C in the same manner as described above, where it is further bent and formed into a cross-sectional shape as shown in FIG. 4C. That is, a complex final cross-sectional shape as shown in FIG. 1 is formed. Although the above explanation focused on the same cross section, other cross sections are molded in exactly the same way. However, since the guide groove 13b is inclined, the width changes accordingly, and the final shape becomes tapered as shown in FIG. Note that the roll forming apparatus is not limited to the three stages A, B, and C described above, but a plurality of combinations of the roll forming apparatuses A, B, and C may be arranged to form six stages, nine stages, and so on.
or by adding another roll forming device to the combination of roll forming devices A, B, and C to form 5 steps, 7 steps, etc., the number of steps corresponds to the cross section of the required product. Of course it is possible. Furthermore, in Fig. 3 and Fig. 4, the case where a predetermined cross section is formed by roll forming devices A, B, and C was explained, but if the cross section is complicated or the product is thick, the roll forming devices A, B, and C may be used. It is also possible to have four or more stages instead of three stages. In addition, in the above processing, the width of the product decreases (or increases) at a constant rate, but by changing the guide groove 13b to a curved shape, for example,
The width of the product can be changed arbitrarily.

Incidentally, in the case of the roll forming apparatus of the present invention, the gap between the fixed rolls 9 and 10 may be equal to the thickness of the plate, but the gap between the movable roll pieces 11 and 12 is set so that the movable roll pieces 11 and 12 can easily move. 0.1~0.2 from plate thickness
It is preferable to keep it large by about mm. Also, the first
As shown in the figure, the taper angle α of the plate material 1 is α=
When tan ^-1 a/b, as shown in FIG. 5, in order to prevent the guide groove 13b of the sheet cam 13 and the flange 11a of the moving roll piece 11 from biting into each other,
Taper both sides, for example, flange 11
Let the inclination (chamfer) angle β of a be β=α+15° ⁰ _-10 ′,
The groove side wall inclination angle γ of the guide groove 13b is γ=β+
It is best to design it as 15゜⁺¹⁰ ₀ ′.

It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, the guide groove 13b of the sheet cam 13 may be provided on the lower surface side so that the movable roll piece 12 is directly moved by the sheet cam 13. Further, the arrangement of the upper and lower movable roll pieces 11 and 12 may be reversed, or a groove may be formed on the movable roll piece 11 side and a guide protrusion may be provided on the sheet cam 13 side.

As explained above, according to the roll forming apparatus of the present invention, since a pressing step is not required, tapered plate materials can be formed easily, efficiently, and with high accuracy.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a tapered plate material, Fig. 2 is a cut front view of the roll forming apparatus of the present invention, and Fig. 3 is an explanatory diagram of a tapered plate material.
A plan view of a plate material being formed using multiple devices shown in the figure, Figure 4 A, B, and C are explanatory diagrams showing changes in the shape of the plate material, and Figure 5 shows a moving roll piece and a sheet cam. It is an explanatory view of the angle in the engaging part of. 1... Plate material, 3, 4... Stand, 5... Drive device,
6, 7... Drive shaft, 9, 10... Fixed roll piece, 1
1, 12...Moving roll piece, 13...Sheet cam, 1
3b...Guide groove, 14, 15...Guide roll piece.

Claims (1)

[Claims] 1 A pair of drive shafts are supported between opposing stands, a fixed roll piece is provided on the pair of drive shafts,
The roll forming apparatus further comprises a movable roll piece movable in the axial direction adjacent to the fixed roll piece, and the movable roll piece is moved by a sheet cam.