JPS6186031A - U bend working equipment - Google Patents

Abstract

PURPOSE:To enable the U bend work of the plate stock having the necessary flange by making the bend work profiling to the shape of the core metal on both end parts of a work with applying a pressure from the face sides of both sides of the core metal on the both and parts of the work supported by the core metal. CONSTITUTION:Roll stands 54, 56 are provided movably in the right angled direction with the moving direction of a table 18 by cylinders 50, 52 and forming rolls 58, 60 are supported on the stands 54, 56. The pressure by the rolls 58, 60 is applied on the end part of the work 90 after setting the work 90 on a metal core 10 with locating the metal core having extended side wall on the table 18. When the table 18 is driven, the work 90 is bent along the shape of the core metal 10 by rolls 58, 60 and a shrinking flange 90B and extending flange 90C are formed on the end part of the work 90. The U bend work forming a extending flange and shrinking flange is thus enabled on the plate stock.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a U-bending device, and particularly to a U-bending device suitable for plastically working a U-bending product from a flat metal plate.

[Conventional technology]

When forming a U-bent product from a metal flat plate, conventionally, press working using a mold consisting of punches and dies, roll forming using rolls, etc. have been used.

When forming U-bent products by press working, a dedicated mold is required for each product, so the versatility of the mold is low.
In order to mold many types of U-bent products, many molds are required, which increases the cost of the molds and also requires a large space for storing the molds. Furthermore, press working has disadvantages such as high noise levels and the tendency for rudders to occur in the flange portions of the product, particularly in the shrunk flange portions. On the other hand, roll forming mink is superior to press processing K in terms of noise and galling.

[Problem that the invention seeks to solve]

However, roll forming is limited to U-bent products with a constant cross-section and a straight or curved bending line; It was not possible to mold a product with 7 shrinkage lunges. In addition, roll forming usually involves continuous processing of coiled material, and the finished product is cut in the final process, so in addition to the roll forming machine, ancillary equipment such as an uncoiler, leveler, and cutting device are required. , equipment costs will be large.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a U-bent product having high versatility in molds for many types of U-bending products with different shapes, and having a stretch flange and a contracted flange. An object of the present invention is to provide a U-bending processing device capable of processing.

Means for Solving Problem C] To achieve the above object, the present invention comprises a plate-shaped male mold that supports a workpiece, and a pair of side walls that restrict the bending shape of the workpiece are mutually extended in a curved shape. a pair of female mold forming rolls that abut from both side surfaces of the mandrel at both ends of the work supported by the mandrel and protruding from each curved side wall of the mandrel; A pressurizing device that applies a pressing force to each forming roll in a direction in which each forming roll approaches each other to cause each forming roll to follow the side wall of the mandrel, and a direction in which the curved side wall of the mandrel extends. t! It has a moving device that moves either the mandrel or the pressure device along the mandrel, and a presser roll that is rotatably fixed to the pressure device and comes into contact with the work surface on the mandrel. The present invention is characterized in that it includes a work holding device that applies pressure to the surface of the work and prevents the work from separating from the mandrel due to the pressing force of the pressurizing device.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 shows the configuration of a preferred embodiment of the present invention.

As shown in FIG. 1, this embodiment is comprised of a mandrel 10, a pressure device 12, a moving device 14, and a '7-1 press 16.

The mandrel 10 constitutes a plate-shaped male mold that supports a workpiece made of a metal plate, and is placed on a flat table 18. Further, movement in the longitudinal direction is prevented by a roll stopper 20.22 fixed on the table 18.

Further, a pilot pin 24 is fixed to the surface of the mandrel 10 for positioning the workpiece. This pilot bin 24
is constructed so that its center section collapses inward due to pressure. Moreover, a curved line is formed on the side wall of the mandrel 10 along the longitudinal direction to regulate the bending shape with respect to the workpiece. Further, a side wall portion is formed on the mandrel 10 in consideration of the springback Δθ of the workpiece. Note that between the roll dowels 20 and 22 and the mandrel 10, a stepped portion 25 is formed with the thickness of the workpiece or slightly smaller than the thickness of the workpiece. Longitudinal movement is prevented.

The moving device 14 has a Vi motor 26, a gear 28, a 30° feed screw 32, a bearing 34, etc., and has a bearing stand 3 fixed to both ends of a base 36 extending along the longitudinal direction of the mandrel 10.
At 8.40, a feed screw 32 is rotatably fixed. The rotational force of the motor 26, which rotates in forward and reverse directions, is transmitted to the feed screw 32 via the gears 28, 30, and the bearing 34 and the feed screw 32 mesh with each other in accordance with the rotation of the feed screw 32. Bearing 34
is fixed to the end of the table 18. Further, a pair of tracks 4 disposed on the table 18#-t and the base 36
2.44 via a guide member 46 so as to be freely slidable. Therefore, when the motor 26 rotates forward, the rotational force of the motor 26 is transmitted to the feed screw 32, and the rotation force of the motor 26 is transmitted to the feed screw 32.
The table 18 is moved to the bearing stand 40 by the engagement between the bearing 34 and the bearing 34.
Move to the side.

On the other hand, when the motor 26 is rotated in the reverse direction, the feed screw 32 is rotated in the reverse direction, and the table 18 moves from the bearing stand 40 side to the bearing stand 38 side.

Pressure device 1'2 H cylinders 50, 52, roll stands 54, 56. A cylinder 50.52 is fixed on a base 62.64 having forming rolls 58.60 etc. and fixed to both sides of the base 36. Also, the cylinder 50
．． 52 rods 66 and 68 are each roll stand 5
4.56 and roll stand 54.56
is the pace 62.6 due to the drive of the cylinder 50.52.
Slide pace 70.72 fixed to 4 and roll stand 54.56 guide and lifting prevention play) 7
4.76 so that it can reciprocate in a direction perpendicular to the direction of movement of the table 1B. Each forming roll 58,60 also has a rod 7 as shown in FIG.
8.80, and rotatably fixed to the roll stand 54, 56 via bearings 82, 84. When the forming rolls 58.60 move toward each other due to the actuation of each cylinder 50.52,
Forming rolls 58.
60 side walls abut. As the table 18 moves, the forming rolls 58.60 rotate, and the pressing force acting in the direction in which the forming rolls 58.60 approach each other bends both ends of the workpiece 90. 60 follows the curve that regulates the bending shape of the mandrel 10, that is, the bending line 91.

Work holding device RI 6t- is connected to gate frame 92, plate holding roll 94, plate 96, guide post 98°10
0, a cylinder 102, etc., and both ends of a portal frame 92 are fixed to paces 62 and 64. cylinder 1
02 is fixed to a beam part of a gate-shaped frame 92, and a plate presser roll 94 is rotatably fixed to a plate 96. In addition, the rod of the plate 96 Fi cylinder 102 is fixedly fixed, and the plate presser roll 94 can be moved up and down in a direction perpendicular to the moving direction of the table 18 by the guide of the guide posts 98 and 100 inserted through the through hole of the portal frame 920. It is said that The presser roll 911 comes into contact with the surface of the workpiece 90 by the operation of the cylinder 102 and rotates as the workpiece 90 moves, and the forming roll 58
．． It is configured to press the work 90 with a pressure that prevents the work 90 from separating from the mandrel 10 due to the pressing force of 60. That is, when the workpiece 90 is bent by the plate holding rolls 94 and the forming rolls 58° and 60 to form a flange on the side surface, this is to prevent the web surface 90A of the workpiece 90 from lifting up from the mandrel 10 and curving. This also serves to correct warping in the longitudinal direction that occurs on the web surface 90A of the workpiece 90.

The present embodiment has the above configuration, and its operation will be explained next.

First, when bending the workpiece 90, the table 18 is moved to the bearing stand 40 side and the workpiece 90 is placed on the mandrel 10.
Set. At this time, the pilot pin 24 is inserted into a positioning hole drilled in the work 90 to ensure positioning of the work 90.

In addition, at this time, the upper surface of the workpiece 90 is the roll stopper 20.2.
It will be slightly protruding from the top surface of 2.

Next, the motor 26 is reversely rotated to move the table 18 toward the bearing stand 3B. When the table 18 moves and the roll abutment 20 reaches just below the plate presser roll 94, the cylinder 102 is activated to lower the plate presser row A/94 and bring the plate presser roll 94 into contact with the roll abutment 20. . The pressing force applied to the roll abutment 20 by the plate presser roll 94 is such that it can prevent the web surface 90A of the work 90 from curving or warping. As the table 18 moves, the workpiece 90 is slightly K from the entire surface of the roll.
Because of the exposed state, the plate holding roll 94 can be easily transferred to the upper surface of the workpiece, and furthermore, as the table 18 moves, when the roll support 20 reaches the position of the forming roll 58. The cylinders 50.52 are actuated to move the roll stands 54.56 towards each other.

Then, the side walls of the forming rolls 58 and 60 are pressed against the sides of the roll support 20. If this state continues, the forming rolls 58, 60 rotate and pressure is applied by the forming rolls 58, 601C to the ends of the workpiece 90, bending the ends of the workpiece 90 as shown in FIG. Forming roll 5
For bending by 8.60, the forming roll 58.60 is the core metal 10
Since the work is done while following the shape of the side wall of the workpiece 90
, curves are sequentially formed according to the shape of the mandrel.

According to the above process aK, as shown in FIG.
can be formed. Furthermore, in order to form U-bent products of different shapes, the forming rolls 58 and 60 can be used in common by simply changing the shape of the mandrel 10, which increases the versatility of the mold for U-bending products. .

In addition, in the above embodiment, the forming roll 58°60 is formed into a truncated conical shape and has an inclination angle θl, as shown in FIG. 4(a). If a forming roll whose angle gradually increases from θ1 to θ2...θn is used, the end of the workpiece 90 will be successively bent according to the inclination angle of the forming rolls 58 and 60, so that the angle of the workpiece 90 will be As the final shape is shown in FIG. 5, even when the 7th lunge is formed into an approximately i#, M lTy shape, edge waves can be prevented from occurring in the 7th lunge of the workpiece 90.

Also, as the core metal 10, the springback amount Δθ1 during bending is
．． If the cross-sectional shape considering Δθ2 is shown in FIG. 6 and the mandrel 10 is used with the top and bottom surfaces reversed by 180 degrees, two types of symmetrical zero-bend products can be formed with one mandrel. It is possible.

Further, in the embodiment described above, the table 18 is reciprocated in the horizontal direction using the moving device 14, but the table 18 is fixed and the entire pressurizing device 12 is moved horizontally along the side surface of the pace 16. It is also possible to move the forming rolls 58, 60 along both sides of the mandrel 10 using a moving device designed to do so. In addition, pressurized equipment [12
Although the forming rolls 58 and 60 were used as bending tools, it is also possible to bend the workpiece 90 using a shoe (fixed block).

Further, in the above embodiment, it has been described that the cylinder 50.52 is operated as a pressurizing device for the forming roll 58.60, but instead of the cylinder 50.52, a motor having a positioning function is used to press the forming roll 58.60. Molding may be performed by controlling the position of.

In addition, in the above embodiment, since the workpiece 90 on the mandrel 10 is pressed using the forming rolls 58 and 60, it is necessary to consider the clearance between the punch and the die like in a press die. Can be freely adapted to plate thicknesses of 90 mm.

Further, in this embodiment, a forming roll 58 is used as a bending tool.
．． 60, the processing force is small, and the only noise is the noise from the cylinders, etc., which reduces the noise level compared to when forming by press processing, and prevents scratches on the product surface. can be suppressed from occurring.

In addition, in this embodiment, since the pressure was applied to form from the Tri material punch, incidental equipment such as an uncoiler, leveler, cutting device, etc., as in roll forming, is not required, and the equipment can be made more compact.

〔Effect of the invention〕

As explained above, according to one aspect of the present invention, either the mandrel or the pressurizing device is moved along the curved H-shaped side wall of the mandrel, and the mandrel is attached to both ends of the workpiece supported by the mandrel. Apply pressure from both G1+1 sides of the gold to both ends of the workpiece,
Since the bending process is performed while following the shape of the mandrel, it is possible to perform U-bending process to form expansion flanges and contraction flanges on the plate material, and it also increases the versatility of the mold for U-bending products with different shapes. You can get excellent results.

[Brief explanation of the drawing]

Fig. 1 is an overall perspective view of an apparatus showing an embodiment of the present invention, Figs. 2 and 2 are sectional views of essential parts of the pressurizing apparatus shown in Fig. 1, and Fig. Figure 4 is a diagram illustrating the processing steps using different forming rolls, and Figure 5 is the U-bent product formed by the processing steps shown in Figure 4. FIG. 6 is a sectional view showing another embodiment of the mandrel. 10... Mandrel, 12... Pressure device, 14... Moving device, 16... Work holding device! FJ', 18
...Table, 26...Motor, 32...Feed screw, 34...Bearing, 50,52゜102...Cylinder, 58.60...Forming roll, 92...Portal frame ,94...1tLt roll.

Claims (1)

[Claims] (1) A mandrel in which a pair of side walls extending in a curved manner form a plate-shaped male mold that supports the workpiece and regulates the bending shape of the workpiece, and each of the mandrels among the workpieces supported by the mandrel. A pair of female forming rolls are provided at both ends of the workpiece protruding from the curved side wall, and are in contact with the core from both sides, and a pressing force is applied to each forming roll in a direction in which the forming rolls approach each other. a pressing device that causes each forming roll to follow the side wall of the mandrel, and a moving device that moves either the mandrel or the pressing device approximately along the direction in which the curved side wall of the mandrel extends. The presser roll is rotatably fixed to the pressure device and comes into contact with the workpiece surface on the mandrel. Pressure is applied to the workpiece surface through the presser roll, and the workpiece is pressed by the pressing force of the pressure device. A U-bending device comprising: a workpiece holding device that prevents the workpiece from separating from the mandrel.