JPS6360020A - Bending method for panel work - Google Patents

Abstract

PURPOSE:To improve the working accuracy by installing a side pad on the top side part of a punch and a pad in the recess of a bent die and working a part to be worked by pushing it into the recess of the bending die. CONSTITUTION:A side punch 11 is installed on the top side of a punch 5 and is energized by a spring 13; a pad 12 is installed in a recess 3a of a bent die 3 and a pressing member 14 consisting of an air cylinder giving the pad 12 a prescribed energizing force is also installed. A panel work A is set on a die 3 of a lower die 1, an upper die 2 is moved down to press the work A by the pads 8, 12 and the side pad 11 through a drive cam 10 and the member 14. The bending work accuracy is improved because bending is performed with the parts of the work A to be worked being subjected to tensile stresses more than the yield point.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a processing method for bending the side portions of a panel work that has been press-formed in advance.

(Prior Art) Conventionally, a lower mold a as shown in FIG. is provided with a movable punch d, and the punch d is moved in conjunction with the lowering of the upper mold e.
is moved laterally inward toward the recess so that the bent portion of the panel work A is pushed into the recess.

(Problems to be Solved by the Invention) In the conventional method described above, the bent portion of the panel work A is simply pushed into the recess by the punch d. Tode 2nd
Even if it is formed as shown by the chain line in the figure, there is a problem in that the processed area returns as shown by the solid line in the figure due to springback, making it impossible to accurately bend the desired shape.

An object of the present invention is to provide a processing method that solves these problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a processing method for venting the side portions of a panel work that has been press-formed in advance. A bent die having a lateral recess that matches the processing location and a laterally movable punch facing the recess are provided, and the punch is moved laterally toward the recess in conjunction with the lowering of the upper die. In a device in which the bent part of the panel work is pushed inward into the recess, a side pad provided on the upper side of the punch pushes the part directly above the processed part of the panel work into the lateral side of the bent die. The machined part is pressed into the recess from the outside, and the machined part is held between the punch and a pad provided in the recess that supports the machined part of the panel workpiece from the inside. It is characterized by being pushed in.

(Function) If the clamping force used to clamp the panel work between the pad and punch is set in advance to a value that will cause a tensile force greater than the yield stress to act on the bent portion of the panel work, the panel work can be bent. When a tensile force greater than the yield stress is applied to the part, and the right upper part of the processed part is pressed by the side pad and is in close contact with the side surface of the bent die, the processed part is pushed into the recess of the bent die. The spring bag is then reduced and vented to the desired shape.

(Example) The drawing shows a panel work that has been press-formed in advance and is vented on the side. Referring to FIGS. ) indicates the upper die, and the lower die (1) is fitted with a bent die (3) having a lateral concave portion (3a) that matches the vent processing location of the panel work △. A punch holder (6) is provided under the recess (3a) of the bent die (3) to support the punch (5) facing the recess (3a). ) is biased laterally outward (to the right in the figure) with respect to the bent die (3) by a spring (7), and presses the upper side of the panel work A against the upper die (2). The pad (8) is biased downward by a spring (9), and
As the upper die (2) descends, it comes into contact with the cam surface (3C) of the cam slider (3b) protruding from the end of the bent die (3), and the bent tie (3) is inserted into the spring (4). laterally outwardly and on the outer cam surface (6) of said holder (6).
A drive cam (IG) of common 1 (l!iI) was provided on the upper mold (2) to abut against the holder (6) and move the holder (6) laterally inward against the spring (7).

Then, the upper mold (2) is lowered, and in conjunction with this, the punch (5) is moved inward, and the sand pad 0V provided on the upper side of the punch (5) is used to bend the panel work A. A pad (3a) provided in the recess (3a) that supports the processed area of the panel work A from the inside with the right upper part of the bent die (3) pressed from the outside against the side surface (3d) of the bent die (3). 12+ and the punch (5) sandwiched the processed area, and the processed area was pushed into the recess (3a).

The side pad q1 has a spring (
The pad az is provided so as to be biased inwardly (to the left in FIG. 3) at the bent die (3). A pressure member 0@ consisting of an air cylinder was provided on the back side to apply a predetermined biasing force to the pad (+21) toward the punch (5).

In addition, in the illustrated one, there is a recess (1) on the front surface of the pad (12).
2a) and the recess (12a) on the front surface of the punch (5).
) are respectively formed, and with the pad ab and the punch (5) sandwiching the bent portion of the panel work Δ, the bent portion is attached to the four portions (3a) of the bent die (3). ), the processed area can be held in such a way that the holding part does not slip when being pushed into the machine. In the drawing (I
Reference numeral 9 indicates a return spring on the back side of the pad QZ that returns the pad 0 to a predetermined position, and IQ indicates a stopper to prevent the pad (I2) from popping out.

Next, the operation of the above embodiment will be explained. First, panel work A is set on the bent die (3) of the lower mold (1), and then the upper mold (2) is lowered. Cam slider (3b)
A predetermined position (the third As the upper mold (2) continues to descend,
The pad (8) comes into contact with the top surface of the panel work A, and the panel work A is pressed down from above by the pad (8), and the drive cam (IG) comes into contact with the cam surface (6a) of the punch holder (6). , the cam holder (6) is connected to the spring (7
) is moved to the concave part (3a) side of the bent die (3), thereby causing the side pad C11) to move against the panel work △
The punch (5) comes into contact with the outside surface directly above the vent processing location, and also resists the pressure member q @ that biases the pad (Iz) and the spring 03 that biases the side pad at. The punch (5) is moved so that the panel work A is pressed directly above the processed area by the side pad (11) against the side surface of the bent die (3), and the processed area is Pad (121 and the punch (5)
While being held between the two, the punch (5) pushes the processed area into the recess (3a) as shown in FIG. Here, the clamping force for clamping the panel work A between the pad (5) and the punch (5), that is, the biasing force of the pressure member a@, is preliminarily set to such a degree that a tensile force greater than the yield stress acts on the bent portion of the panel work A. If the setting is made, a tensile force greater than the yield stress is applied to the bent part of the panel work A, and the right part of the bent part is pushed by the side pad av and the bent die (3) is pressed. Since the processed area is pushed into the recess (3a) of the pen 1 to die (3) while being in close contact with the side surface, the spring bag is reduced and the
It is bent into the desired shape as shown in the figure.

Thereafter, the upper die (2) is turned upside down and the processed panel work A is taken out to complete the work.

(Effects of the Invention) As described above, according to the present invention, since the bending process is performed under tension, springback is reduced, and there is an effect that the side portion of the panel work can be accurately bent into a desired shape.

[Brief explanation of the drawing]

Figure 1 shows the i! 2 is a cross-sectional view of the main part of a panel work formed by the conventional method, and Fig. 3 is a sectional view of the main part of a press machine that bends the side part of the panel work by the method of the present invention. FIG. 4 is a low-level front view of the main part of the panel work in the pressed state, and FIG. 5 is a cross-sectional view of the main part of the panel work formed by the method of the present invention. (1)...lower mold (of...upper mold (3)...
... Bent die (3a) ... Recess (5) ...
Punch (111...Side pad (+21)
... Pad △ ... Panel work Figure 1 a Figure 2 Figure 5 Figure 4

Claims (1)

[Claims] A processing method for penting the lateral side of a panel workpiece that has been press-formed in advance, the lower mold having a bent die having a lateral concave portion that matches the bent portion of the panel workpiece, and a lateral side portion facing the concave portion. A punch that is movable in the direction of the punch is provided, and the punch is moved laterally inward toward the recess in conjunction with the lowering of the upper die to push the bent portion of the panel work into the recess. , with the side pad provided on the upper side of the punch pressing the right upper part of the processed part of the panel work against the side surface of the bent die from the outside, and supporting the processed part of the panel work from the inside. A method for bending a panel work, characterized in that the workpiece is pushed into the recess while the workpiece is held between a pad provided in the recess and the punch.