JPH0117373Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a material pre-bending device, which enables pre-bending of the material as a pre-treatment for material drawing in the press working of thin steel sheets in the same press machine. This invention relates to an improved material pre-bending device.

[Conventional technology]

Steel bumpers for vehicles are drawn by press working, but before drawing, usually both ends of the material are bent as a pretreatment to obtain the basic shape of the bumper.

Conventionally, in order to perform preliminary bending of a material, a dedicated pre-bending machine or a press machine having a bending die was separately installed in a pre-process of a press machine having a drawing die. In other words, in a conventional press line, the press material is first bent into a shape that follows the basic shape of the product in a preliminary bending process, and then transferred to the next independently installed drawing press machine to perform drawing forming. I was doing it.

[Problem that the invention attempts to solve]

However, in conventional press lines, preliminary bending and drawing of the material are performed independently, resulting in a long line length. In addition, when the line length is short and there is a limit to the number of press machines installed,
If there is no dedicated pre-bending machine, it is not possible to pre-bend the material, and therefore the drawing press machine has to perform bending and drawing at the same time, resulting in the need to increase the vertical stroke length of the press machine. There is a problem in that work efficiency deteriorates.

The present invention focuses on the above-mentioned conventional problems, and when molding a product that has a bent part and a drawn part, such as a bumper for a vehicle, the preliminary bending and drawing of the press material are performed in the same press machine. It is an object of the present invention to provide a material pre-bending device that uses the lifting force of a press as a bending force, eliminates the need for a dedicated pre-bending machine, and improves work efficiency.

[Means for solving problems]

In order to achieve the above object, the material pre-bending device according to the present invention has an upper blade fixed to the lower press member on the front side of the drawing press, and a gap in which the press material fits into the lower side of the upper blade. A material presser is provided, one end of which is pivotally supported by the lower press die member, the other end of which extends below the press material protruding from the upper blade and is located close to the upper blade. a lifting roller protruding from the side surface of the arm of the bending arm; a latch arm hanging down from the press upper mold member; and a latch pawl that is pivotably supported to rotate only across the body, and the positional relationship between the lifting roller and the latch pawl is such that the latch pawl lifts in the process of raising the latch pawl as the press upper die member rises. The lifting roller is arranged to engage with a roller to rotate the bending arm upwardly, and to separate from the latch pawl when the bending arm reaches a predetermined upper end position of rotation. do.

[Effect]

With the above configuration, when the drawing press machine is clamping the mold, the press material is supplied to the gap between the upper blade fixed to the lower press member at the front of the press machine and the material presser, and the press material is supplied to the gap between the material presser and the upper blade fixed to the press lower die member at the front of the press machine, and the press material is The lifting action of the upper mold is used to pull up the latch arm attached to the press upper mold member, and the latch claw provided at the lower end of this latch arm is hooked to the lifting roller of the bending arm to rotate the bending arm. can be done.

One end of the bending arm is pivotally supported by the lower press mold member, and the other end extends below the press material protruding from the upper blade and is provided close to the upper blade, so that the upper mold can be raised. As the bending arm rotates upward, this rotation generates an acting force that bends the material along the upper blade, thereby performing preliminary bending. In addition, by setting the upper end position of the bending arm in accordance with the bending end position, the latch claw and lifting roller are released and the bending arm is rotated downward by its own weight to return to its original position. Return to When the press upper mold member is lowered, the latch pawl comes into contact with the upper part of the lifting roller, but since the latch pawl is formed so that it can rotate upward, it is retracted upward as it descends, returning to its original positional relationship. Return.

In this way, preliminary bending can be performed using the pulling force of the press.

〔Example〕

An embodiment of the material pre-bending device according to the present invention will be described in detail below with reference to an example in which it is applied to steel bumper forming.

FIG. 1 is a front view of the embodiment apparatus with the left half omitted, and FIG. 2 is a side sectional view of a press equipped with the embodiment apparatus.

First, a drawing press machine equipped with a material pre-bending device fixes a lower mold 10 corresponding to the outer surface of the product bumper to a lower mold mount 12, and on the other hand, deep-draws a lower mold 10 corresponding to the inner surface of the bumper facing the lower mold. Main upper mold 14A forming
and rear secondary upper mold 1 corresponding to the inner surface of the upper and lower parts of the bumper.
4B, the front sub-upper mold 14C are attached to the upper mold mounting frame 16 respectively.
It is attached to A, 16B, and 16C.

A material pre-bending device is attached to the front face of such a drawing press. That is, an upper blade 20 and a material presser 22 are mounted on the lower mold mounting base 12 at a position slightly higher than the height of the cavity part of the drawing press and at a position corresponding to the bending part of the press material 18.
is installed. The upper blade 20 is a block body arranged along the width direction of the bending part on the upper surface of the material 18, and has a curved bending guide 20A on the outer edge of the lower surface thereof.
is formed. The upper blade 20 has an upper beam 24 arranged slightly below the lowering limit height of the mounting frame 16C for the front sub-upper die 14C of the press, a lower beam 26 parallel to this, and a side plate 28 connecting these.
It is attached to the lower corner of the frame consisting of. The upper beam 24 is further extended laterally, and both ends thereof are supported by support columns 30 erected from the lower die mounting base 12.
It is supported by On the other hand, a material presser 22 is provided facing the upper blade 20, but this is a flat plate body, and an allowance gap 32 several mm larger than the plate thickness of the press material 18 is provided between it and the upper blade 20. The material 18 can be inserted. The material presser 22 has a length slightly shorter than the distance between the pair of upper blades 20, so that the end of the material that requires bending when holding the press material 18 protrudes laterally. In addition, in order to support the material presser 22, a lower plate 34 is provided at the lower part of the material presser 22 in parallel thereto, and both are connected by side plates 36 to form a frame. is fixed to the lower die mounting base 12 via a bracket 36. Therefore,
The upper blade 20 and the material presser 22 are both attached to the lower die mounting base 12.
It is fixed to .

The lower plate 34 that supports the material presser 22 is further extended laterally, and a support stand 3 is provided on this extended end.
8 is erected, and the press material 18 is placed on the support stand 38.
A bending arm 40 is attached to perform preliminary bending. The bending arm 40 is pivotally supported by a bearing part 42 installed on the support base 38, and its tip extends to the side of the material presser 22 corresponding to the lower surface of the press material 18 that protrudes laterally from the upper blade 20. are doing. A processing roller 44 is attached to the tip of the arm, and by upward rotation of the bending arm 40, the processing roller 44 is pushed up from the lower surface of the press material 18, and the upper blade 2
The material 18 is bent along the line 0. Further, the bending arm 40 is only allowed to rotate upward by a stopper 46 installed on the support base 38 so that the processing roller 44 is always positioned on the side of the material presser 22.

The driving force for causing the bending arm 40 to perform the bending process uses the upper mold lifting force of the drawing press, and for this purpose, the upper mold mounting frame that holds the front sub-upper mold 14C of the press machine is used. Latch arm 48 is attached to 16C. The latch arm 48 is suspended from the upper die mounting frame 16C, passes through the upper beam 24, crosses the bending arm 40, and extends to the lower part thereof, and is provided with a latch pawl 50 at its tip. The latch pawl 50 is pin-coupled to a thin stepped portion at the tip of the bending arm 40, and the tip of the pawl is directed toward the support base 38. In order to hold the latch pawl 50 horizontally, a stopper surface 52A is formed on the stepped portion to abut against the upper surface of the rear end of the pawl, thereby preventing the latch pawl 50 from rotating clockwise in the figure. Further, an inclined surface 52B is formed on the stepped portion so that the latch claw 50 can rotate counterclockwise within a certain range, and rotation is allowed until the upper surface of the claw comes into contact with this inclined surface 52B. Also,
A lifting roller 54 is attached to the bending arm 40 and has a half portion thereof exposed on the locus of movement of the latch pawl 50 as the latch arm 48 moves upward in a stopped position by the stopper 46 . Therefore, the upward movement of the latch arm 48 causes the latch pawl 50 to engage with the lifting roller 54 to impart a bending action to the bending arm 40, and after the bending arm 40 has rotated a predetermined amount, the lifting roller 54 moves the latch pawl 50 upward. Because it deviates from the movement trajectory, it separates from the latch pawl 50,
The bending arm 40 returns to its initial position. When the latch arm 48 is lowered again, even if the lower surface of the latch pawl 50 comes into contact with the lifting roller 54, the lower surface of the latch pawl 50 can escape due to its rotation, so there is no problem with the lowering operation.

A cylinder means 56 is installed on the lower plate 34, which is a supporting component of the material presser 22 described above, and a material moving arm 58 whose lower end is pivotally supported is connected to this cylinder means 56. The upper end of the material moving arm 58 extends outside the gap 32 between the upper blade 20 and the material presser 22, and an extrusion piece 60 is provided at the upper end. These mechanisms are for transferring the press material 18 after preliminary bending onto the lower mold 10 of the drawing press.

Processing using the pre-bending device configured as described above is as follows. The latch arm 48 fixed to the upper die mounting frame 16C descends and hits the lifting roller 54 of the bending arm 40 supported substantially horizontally, the latch claw 50 rotates and escapes, and the lifting roller 5
A latch pawl 50 is located on the lower surface of 4. As the upper mold mounting frame 16C rises after the drawing process of the drawing press machine is finished, the latch claw 50 lifts the lifting roller 54, and the press material 18 is subjected to preliminary bending along the upper blade 20 by the arc movement of the processing roller 44. be done. Then, as the upper die mounting frame 16C further rises, the lifting roller 54 separates from the latch claw 50, and the bending arm 40 descends under its own weight, completing one process. Thereafter, the pressing material 18 is driven by the cylinder means 56, and the upper end extrusion piece 60 of the material moving arm 58 pushes the edge of the material, and the material is introduced into the drawing press.

According to this embodiment, the pre-bending process on the press material 18 is performed by the material pre-bending device attached to the front of the press machine, using the vertical movement of the press machine, so there is no need to provide a separate dedicated machine. In addition to making effective use of space without having to use the bending method, a power section dedicated to pre-bending is not required, resulting in an energy saving effect. Moreover, since the structure is attached to the drawing press machine, there is no need to change the setup of the preliminary bending device.
Work efficiency is improved, and since the press material 18 can be moved to the drawing die using a simple extrusion mechanism, the work time can be shortened.

[Effect of idea]

As described above, according to the present invention, preliminary bending and drawing of a press material can be performed in the same press machine,
Furthermore, since the preliminary bending process is performed using the pulling force of a press machine, a dedicated machine can be omitted, work efficiency can be improved, and the press line can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a front view with the left half omitted of a material pre-bending device according to an embodiment, and FIG. 2 is a side sectional view of a drawing press equipped with the same device. 10...lower mold, 12...lower mold mounting base 12, 14
A to 14C... Upper die, 16A to 16C... Upper die mounting frame, 18... Press material, 20... Upper blade, 22
... Material presser, 32 ... Gap, 40 ... Bending arm, 44 ... Processing roller, 48 ... Latch arm, 50 ... Latch claw, 54 ... Lifting roller.

Claims (1)

[Scope of Claim for Utility Model Registration] An upper blade fixed to a lower press member on the front side of a drawing press, and a material presser disposed below the upper blade with a gap for inserting the press material, a bending arm having one end pivotally supported by the lower press mold member and the other end extending below the press material protruding from the upper blade and provided close to the upper blade;
A lifting roller protruding from the side surface of the arm of the bending arm, a latch arm hanging down from the upper mold member of the press, and a lower end of the latch arm that can be rotated only within a certain angle upward from a substantially horizontal state. a latch pawl pivotally supported by the latch pawl, and the positional relationship between the lifting roller and the latch pawl is such that the latch pawl engages with the lifting roller during the raising process of the latch pawl as the press upper die member rises. The material pre-bending device is arranged such that the bending arm is pivoted upwardly and the lifting roller disengages from the latch pawl when the bending arm reaches a predetermined upper end of rotation position.