JPS6320611B2 - - Google Patents

Description

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a method for bending door frames, moldings, etc. (hereinafter simply referred to as "moldings") in multiple dimensions. BACKGROUND ART Conventionally, in this type of bending process, a material bending guide roll element that forms a gap for material insertion using a plurality of roll materials is attached to an outer frame using a universal joint mechanism, and the outer frame is fixed to a rotating plate. The slide plate is supported by a trochanter that is pivotally supported on the slide plate, and the slide plate is mounted on the slide support frame so that it can move up and down using a ball screw mechanism that drives the slide plate, and the slide support frame is mounted on the base frame so that it can move vertically. A device (Japanese Patent Publication No. 58-43165) that is movably attached to the machine is used to bend a straight material in multiple dimensions, which is inserted from the guide roll element for positioning the material to the guide roll element for bending. It is known. However, in this bending process, the bending machine is controlled by a detector command that measures the delivery dimension of the molding material according to an X-Y program that combines left and right slides and up and down slides for multi-dimensional bending. Since the bending process is performed by bending, the program becomes complicated and it is difficult to perform accurate bending.Additionally, when torsional bending in the axial direction is added, the process becomes even more complicated. DISCLOSURE OF THE INVENTION An object of the present invention is to provide a method for bending moldings that can accurately control bending using a simple program. That is, in the method for bending moldings according to the present invention, the entire length of a long molding material that has been bent into a predetermined cross-sectional shape in advance is divided into a plurality of imaginary segments of arbitrary constant length. At the same time, the amount of movement of each axial bending mechanism of the molding type bending device disposed behind the holding device that supports the molding material in a slidable manner along the axial direction is set for each imaginary segment, By detecting each segment as the molding material is continuously fed, and individually controlling the movement of each axis bending mechanism of the molding type bending device by a predetermined movement amount in response to the detection command. , the axial direction of the molding material is bent in multiple dimensions at desired continuous different curvatures. Embodiments The following description will be made with reference to the drawings. In this embodiment, when manufacturing a molding for a vehicle, a plastically deformable flat thin strip material such as a stainless steel plate is used as the material, and after bending it into a predetermined cross-sectional shape, the material is bent in the axial direction. Bending process is being carried out to have multiple different curvatures in multiple dimensions. There are several types of vehicle moldings that differ depending on the mounting location on the vehicle body (see Figure 1), and their cross-sectional shapes are M ₁ to _{M 6} around the front and back windows (Figure 2 a to d),
M ₇ around trip rail, M ₈ around fender (2nd
(see Figure G), etc., and the lengths are also different, and molding materials with these different shapes can be easily bent. In these methods, a metal strip material X (see Fig. 3) is formed into a long molding material X' with a predetermined cross-sectional shape by a cold roll forming machine A, and then held at a substantially constant speed by a holding device B. , C to hold it slidably in the axial direction, insert it into the rear bending device D to bend it in multiple dimensions, and then cut it into a predetermined length with the traveling cutting device E. It is. During this process, molding material
If the feed length of X' is measured by the detector F, and each bending mechanism of the bending device D is individually controlled via the controller G for each preset segment according to the measured length, molding material
X' can be bent in multiple dimensions as desired. First, to explain in detail the bending device that has each individually controllable bending mechanism section, this bending device D is based on a base fixedly supported by stand-up frames 11 and 12 on the left and right sides on the plate surface of the machine stand 10. They are respectively attached and arranged on the plate 13 together with the holding device C (see FIG. 4). The bending device D is mounted so that it can swing left and right by pivoting the base plate 14 with a support shaft 15 (see FIGS. 4, 5, and 6). A rising plate 16 is integrally attached to the base plate 14 so as to be vertical and perpendicular to the feeding direction of the molding material, and approximately in the center of the plate surface of this rising plate 16 is the molding material fed from the holding device C. Roll groups 20a, 20b, and 20c are installed to support the material X' from at least the left and right sides and hold it in the horizontal direction (see Nos. 5, 6, and 7). These roll groups 20a, 20b, and 20c form a gap between each opposing surface through which a molding material X' having a predetermined cross-sectional shape is inserted.
Molding material held by 20b and 20c
It is configured to be able to horizontally bend the axial direction of X' at least to the right or left. The horizontal bending mechanism swings the base plate 14 to the right or left using the support shaft 15 as a fulcrum, and guide pins 21a and 21b are used downwardly to alternately and selectively use the tip side of the base plate 14. The guide pins 21a and 21b are mounted so as to protrude and are selectively engaged with cam grooves 23a and 23b formed on the plate surface of the slide plate 22 to horizontally move the slide plate 22 back and forth. (See Figure 7). The slide plate 22 has U-shaped guide frames 24a and 2 on the left and right sides.
4b (see Fig. 4), and a plurality of drive cylinders 27 connected in series between bracket plates 25 and 26 attached to the rear end side of the plate 22 and the machine base 10, respectively. By sliding, the base plate 14 is swung to the right or left along the cam grooves 23a, 23b on the plate surface. In addition to this horizontal bending mechanism, the riser plate 16 is provided with a vertical bending mechanism. The vertical bending mechanism includes a roll group 20a,
It consists of a pair of upper and lower roll groups 30a and 30b arranged behind the rolls 20b and 20c, and these roll groups 30
a, 30b are loosely fitted onto each support shaft, and are supported by a pair of left and right bracket plates 31a, 31b.
1b is uniaxially supported by support brackets 32a and 32b attached to the upright plate 16 so as to be able to swing up and down (see FIGS. 6 and 7). The support shafts 33a, 33b are the bracket plate 31
3a and 31b, and rotatably supported by bearing brackets 32a and 32b. A drive source 34 for swinging the bracket plates 31a and 31b is connected to one side 32b of these support shafts (see FIG. 4). As a driving source, several cylinders connected in series are used, and the rear end is fixed with a support bracket 35, and a linear motion plate 36 is attached to the front end. A notch 36a is provided in the plate surface of the linear motion plate 36 in an oblique straight line, and a pin 37a protruding from the side surface of the cam plate 37 near the free end is engaged with the notch 36a. The cam plate 37 is attached to a rotating shaft 37b at an eccentric position, and the rotating shaft 37b is supported by a bearing 38 so that the cam plate 37 can swing. This rotating shaft 37b and the supporting shafts 33b of the supporting brackets 32a, 32b are connected to the spline shaft 3 through a universal joint.
Can be connected with 9. The spline shaft 39 is expandable and retractable as the base plate 14 swings about the support shaft 15, and a flexible shaft formed by twisting a rope may be used in place of this shaft. Furthermore, in addition to these horizontal bending and vertical bending mechanisms, an axial twisting mechanism may be provided. The torsion mechanism (see FIGS. 5, 6, and 7) attaches a pair of upper and lower rolls 30a, 30b to a rotating plate 40 via roll groups 20a, 20b, 20c and support brackets 32a, 32b, and also raises the rotating plate 40. The rotating plate 40 is fitted into the plate 16 and rotated by a worm gear 41 and a worm wheel 42 provided on the rotating plate 40. This worm gear 41 uses a drive source 43 which is made up of several drive cylinders connected in series (see FIG. 4), similar to the horizontal bending and vertical bending mechanisms, and the drive source 43 is connected via a rack 44 and a pinion 45. It is adapted to be linked to the support shaft 41a of the worm gear 41. The rear end of the drive source 43 is fixed to a support plate 46, and the rack 44 is attached to the rod of the drive cylinder located at the front end. The pinion 45 is rotatably supported by a bearing 47, and its support shaft 45a and the support shaft 41a of the worm 41 are connected to a spline shaft or flexible shaft 48 via a universal joint.
It is attached to the worm 41 so that rotational force can be transmitted by connecting it with the worm 41. The bending device configured in this manner is based on the base plate 14 that swings about the support shaft 15 along the cam groove 23a or 23b of the slide plate 22, and has a horizontal bending mechanism, a vertical bending mechanism, and other functions as necessary. Each is equipped with an axial torsion mechanism that operates accordingly. When bending the molding material X' in the horizontal direction, the rising plate 16
By changing the direction of the gap between the roll groups 20a, 20b, and 20c mounted on the base plate 14 by swinging around the support shaft 15, the molding material X' inserted from the holding device C can be curved to the left or right. You can do it like this. In addition, when bending in the vertical direction, the upper and lower pair of rolls 30a, 30b are swung around the support shafts 33a, 33b of the bracket plates 31a, 31b to change their posture upward or downward from the horizontal position, thereby performing molding. Material X' can be curved. In addition to these two-dimensional bending, when bending is performed by twisting the axial direction as necessary, the worm 41 may be rotated to rotate the rotary plate 40 at a desired angle via the worm gear 42. When the rotating plate 40 rotates, the rotating plate 4
Roll groups 20a, 20b, 20 integrally attached to 0
c and a pair of upper and lower rolls 30a and 30b pass through the molding material X' and twist the axis of the molding material X' with the holding device C to change the position diagonally from the horizontal or vertical position. It can also be bent. When bending in these two-dimensional or three-dimensional directions, for example, vertical bending can be applied to the molding, which is formed into an arcuate shape from a plane, and axial twisting can be applied as necessary. When performing the bending process, the entire length of the molding is divided into imaginary segments 1 to T at arbitrary fixed lengths (see Figure 9), and the amount of movement of each bending mechanism is calculated for each segment 1 to T. By setting them in advance, the horizontal bending mechanism, the vertical bending mechanism, and, if necessary, the axial twisting mechanism can be automatically controlled by the controller G by individually operating them. Each segment 1~T is metal strip material
After bending and forming into a predetermined cross-sectional shape and before sending it to the bending device D, it is preferable to detect it with a detector F such as a rotary encoder (see Fig. 3), and the detection signal is sent to the drive source 27 of each mechanism, By individually transmitting the signals to 34 and 43 via the controller G, each mechanism can be controlled with a drive amount corresponding to the segments 1 to T. For example, when manufacturing molding M ₆ (see Figure 2 a) around the window, the total length is about 1500 mm, so it is divided into 30 to 32 or 50 to 60 segments, and a controller G is used for each segment. By storing the amount of movement as shown in Table 1, and operating each mechanism individually while detecting the segment with the detector F, bending can be performed according to the diagram shown in Table 2.

【table】

Claims (1)

[Claims] 1. The entire length of a long molding material that has been bent and formed into a predetermined cross-sectional shape is divided into a plurality of imaginary segments of arbitrary constant length, and the molding material is aligned along the axis. The amount of movement of each axial bending mechanism of the molding type bending device, which is placed behind the holding device that supports the molding material in a slidable manner along the direction, is set for each imaginary segment. The axial direction of the molding material can be adjusted to the desired direction by detecting the feed in the molding material and individually controlling the movement of each axial bending mechanism of the molding type bending device by a predetermined movement amount in response to the detection command. 1. A bending method for bending, characterized in that bending is performed in multiple dimensions with successive different curvatures. 2. The multidimensional bending process is performed in the horizontal direction and vertical direction of the axis of the molding material, and further in the torsional direction of the axis of the molding material as necessary. A method of bending moldings. 3. The molding according to claim 1, wherein each of the segments is detected by a detector such as a rotary encoder as the molding material bent and formed into a predetermined cross-sectional shape is fed out. Types of bending methods.