JP2003334615A - Mold for bending process and supporting method for auxiliary pad - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To separate auxiliary pads from main pads in a mold for bending process and to simplify a moving structure of auxiliary pads. <P>SOLUTION: By using a flexible part 22, an auxiliary pad 15 is set to a main pad 14. Because of the flexure of the flexible part 22, the auxiliary pad 15 is oscillated between 'a retreat position' shown as dotted line and 'a press position' shown as full line. To this end, the mold does not have a slide structure of the auxiliary pad 15 to the main pad 14 and deterioration of repeatability caused by rickety movement of the slide structure is not generated in each press. And so, the accuracy of parts for control of the rickety movement to the minimum and the adjustment of each part, which are necessary for the slide structure, are not needed. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a bending die having a pad provided with a sub-pad separated from a main pad and having a contact surface with respect to the vicinity of a negative angle surface of a material.

[0002]

2. Description of the Related Art The bending process is a process for bending a surface shape (negative angle surface) having a negative angle with respect to the pressing direction by using a cam mechanism. FIG. 8 shows a mold opening state of a conventional bending die 1 for enabling such a processing method, and FIG. 9 shows a mold closing state of the conventional bending die 1. Shows. Further, FIG. 10 shows a cross-sectional view taken along the line AA of FIG. The lower die 2 of the bending die 1 has a punch 3 and a pressing direction with respect to the punch 3 (see FIGS.
The driven cam 4 is slidably supported in a direction orthogonal to (10 vertical direction). The punch 3 has a processing surface 5 for forming a negative angle surface Wa (see FIG. 9) on the material W.
Are formed. Further, the driven cam 4 is provided with an inclined surface 6 inclined with respect to the pressing direction, and the curved blade 7 and
A spring 8 for pressing a sub pad described later is fixed.

On the other hand, a drive cam 10 is directly fixed to the upper mold 9 and a pad 11 is fixed thereto via a spring 12. The drive cam 10 has an inclined surface 13 for sliding contact with the inclined surface 6 of the driven cam 4. The pad 11 is a main pad 14 and a sub pad separated from the main pad 14.
15, the main pad 14 has a contact surface 16 with respect to a plane Wb orthogonal to the pressing direction of the material W, and the sub pad 15
Has a contact surface 17 against the negative angle surface vicinity Wc. Further, a spring 18 is provided between the main pad 14 and the sub pad 15.
As shown in FIG. 10, a slide guide 19 fixed to the sub pad 15 is slidably supported by a slide rail 20 fixed to the main pad 14 in a direction orthogonal to the pressing direction.

According to the above structure, in the mold open state shown in FIG. 8, the elastic force of the spring 18 causes the sub pad 15 to be in the "retracted position" which is the farthest from the main pad 14 in the direction orthogonal to the pressing direction. When the upper die 9 descends toward the lower die 2 for clamping, the abutting surface 16 of the main pad 14 abuts the flat surface Wb orthogonal to the pressing direction of the material W, and the abutment surface 16 with the punch 3. The material W is sandwiched, and the inclined surface 13 of the drive cam 10 contacts the inclined surface 6 of the driven cam 4, so that the driven cam 4 approaches the punch 3. Then, as shown in FIG. 9, when the negative surface Wa is formed on the material W by the processed surface 5 of the punch 3 and the curved blade 7 of the driven cam 4, the sub pad 15 is driven by the spring 8 of the driven cam 4. Is pressed, the sub pad 15 is slid to the “press position”, and Wc near the negative angle surface of the material W
And punch 3 together. Then, when the forming of the negative angle surface Wa with respect to the material W is completed, the driven cam 4 returns to the position shown in FIG. 8 as the upper die 9 rises, and the auxiliary pad 15 also moves to the “retracted position” shown in FIG. 8 by the spring 18. Will be returned.

As described above, the conventional bending die 1 is used.
By separating the sub pad 15 from the main pad 14 and slidingly moving the sub pad 15 in a direction orthogonal to the pressing direction, and sandwiching the negative angle surface vicinity Wc of the material W together with the punch 3,
It is possible to prevent rubbing and galling in the pressing direction in the vicinity Wc of the negative angle surface of the material W to improve the quality of the pressed product.

[0006]

However, the conventional bending die 1 has the following problems.
First, in the sliding mechanism of the sub pad 15 with respect to the main pad 14, the rattling of the sub pad 15 caused by the clearance between the slide guide 19 provided on the sub pad 15 and the slide rail 20 provided on the main pad 14 is different for each press. May adversely affect the reproducibility of. In addition, it is indispensable to secure the accuracy of parts to minimize the rattling of the sub pad 15 and to adjust each part. In addition, the auxiliary pad 15
Since the slide mechanism of (1) has a movable structure (guide structure, return structure, etc.) equivalent to a general movable insert of a press die,
The movable structure takes up a large amount of movement required for the sub pad 15, which increases both the installation space and the installation cost of the movable structure.

The present invention has been made in order to solve the above problems, and an object of the present invention is to separate a sub pad from a main pad in a bending die in a direction different from a pressing direction. By sandwiching the material near the negative angle surface with the punch, it is possible to prevent rubbing and galling in the pressing direction near the negative angle surface of the material, and to simplify the moving mechanism of the sub-pad by simplifying the moving mechanism. Structure installation space,
By reducing both installation costs, it is possible to improve the quality of pressed products and reduce product costs.

[0008]

In order to solve the above-mentioned problems, a bending die according to claim 1 of the present invention comprises a sub-pad separated from a main pad and abutting against the vicinity of a negative surface of a material. A bending mold having a pad provided with a surface,
The sub pad is attached to the main pad, and the sub pad has a flexible member that swings between the retracted position and the press position by its own bending. According to the present invention, the sub-pad is attached to the main pad using the flexible member, and the bending of the flexible member is used to make the flexible pad within the range of elastic deformation. By moving (swinging) the sub pad fixed to the flexible member so as to draw an arcuate path, the sub pad can be moved between the retracted position and the press position. Therefore, the movable structure of the sub pad, such as the guide structure and the returning structure of the sub pad with respect to the main pad, can be established only by the flexible member.

According to a second aspect of the present invention, there is provided a bending die according to the first aspect of the present invention, wherein the flexible member is provided with a bending portion, the main pad or the flexible pad. It is characterized in that it comprises a fixing portion to the sub pad. According to the present invention, the flexible member includes a flexible portion,
The main pad or the sub-pad and a fixing portion, the fixing portion is fixed to the main pad or the sub pad, by bending the bending portion, while minimizing the mechanical loss, A movable structure of the sub pad such as a guide structure and a returning structure of the sub pad with respect to the main pad can be established.

In order to solve the above-mentioned problems, a method of supporting a sub pad according to a third aspect of the present invention is a pad in which a sub pad separated from the main pad is provided with a contact surface for the vicinity of the negative angle surface of the material. In the bending die having the above-mentioned, the sub-pad is attached to the main pad via a flexible member, and the sub-pad is shaken between the retracted position and the press position by the bending of the flexible member. It is characterized by movably supporting it. According to the present invention, the sub-pad is attached to the main pad via the flexible member, and the sub-pad is swingably supported between the retracted position and the press position by the bending of the flexible member. By doing so, the necessary operation of the sub pad with respect to the main pad can be obtained only by bending of the flexible member.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the accompanying drawings. Here, parts that are the same as or equivalent to those of the conventional technique are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 1 shows a closed state of a bending mold 21 according to an embodiment of the present invention. Although the upper die is not shown in FIG. 1, the bending die 21 has the drive cam 10 directly fixed to the upper die and the pad 11 as in the prior art shown in FIGS. 8 and 9. Has a structure that is fixed via a spring 12. Also, the springs 8 and 12
As for the coil spring shown in FIG. 1, a urethane spring similar to that of the conventional technology (FIGS. 8 and 9) or
Other elastic bodies may be used. The bending die 21 according to the embodiment of the present invention has a pad 11 in which a sub-pad 15 separated from the main pad 14 is provided with a contact surface 17 for the vicinity Wc of the negative angle surface of the material W. is there. And the secondary pad
A flexible member 22 is provided which attaches 15 to the main pad 14 and swings the sub pad 15 between its "retracted position" and "press position" described later by its own bending. The flexible member 22 includes a flexible portion 23 and a fixing portion 24 for the main pad 14.
And a fixing portion 25 to the sub pad 15 is a leaf spring. The fixing portions 24 and 25 are located at both ends of the bending portion 23, and are fixed to the main pad 14 or the sub pad 15 by fastening members 26 such as bolts. As the material of the flexible member 22, metal, rubber urethane, FRM, FRP or the like can be used. FIG. 2 shows a view B in FIG.

In the steady state, the flexible member 22 has a slight warp as shown by the chain double-dashed line in FIG.
The sub pad 15 is placed in a “retracted position” away from the material W. On the other hand, when the driven cam 4 is brought close to the punch 3, the sub pad 15 is pressed by the spring 8 to bend the bending portion 23 of the flexible member 22 and
15 is the “retracted position” and the “press position” shown by the solid line in FIG.
It is possible to pinch the vicinity Wc of the negative angle surface of the material W together with the punch 3 by moving the punch to. Then, the processed surface 5 of the punch 3 and the curved blade 7 of the driven cam 4 can form the negative angle surface Wa on the material W. When the forming of the negative angle surface Wa with respect to the material W is completed, the driven cam 4 is separated from the punch 3 as the pad 11 rises, and the sub pad 15 is made of a flexible member.
The elasticity of the flexible portion 23 itself of 22 causes the flexible portion 23 to be returned to the “retracted position” again. As shown in FIGS. 1 and 2, the flexible member 22
Is thin in the sliding direction of the driven cam 4 and wide in the direction orthogonal to the sliding direction of the driven cam 4, so that the bending portion 23 is bent and the sub pad 15 is swung. It is possible to prevent the displacement of the auxiliary pad 15 in the direction orthogonal to the sliding direction of the driven cam 4 while enabling the above. Further, since the flexible member 22 itself has a cushioning property in the sliding direction of the driven cam 4, it is possible to replace the spring 8 with a rigid body when the dimensional accuracy of each member is guaranteed.

Referring now to FIG. 3, the flexible member
An example of a procedure for forming the flexible member 22 for placing the sub pad 15 in the “retracted position” where the sub pad 15 is separated from the material W by exhibiting a slight warp in the steady state will be described. First, as shown in FIG. 3A, the fixing portions 24 and 25 of the flexible member 22 are fixed to the main pad 14 or the sub pad 15 by fastening members 26 such as bolts. A screw hole 27 is formed in advance in the flexible portion 23 of the flexible member 22. At this point, the flexible member 22 is in a state without warpage. Then, the positions of the main pad 14 and the sub pad 15 are fixed by a fixing jig or the like (not shown), and the cutting tools 28 form the contact surfaces 16 and 17 for the material. The main pad 14 and the contact surface 16
And the contact surface 17 of the auxiliary pad 15 may be formed in different steps in advance.

Subsequently, as shown in FIG. 3B, a bolt 29 is screwed into the screw hole 27 of the flexible member 22, and the tip of the bolt 29 is brought into contact with the main pad 14. From this state, the bolt 29 is further screwed in to deform the flexible portion 23 of the flexible member 22 from the elastic deformation region to the plastic deformation region. Figure 3
A two-dot chain line indicated by reference numeral 15a in (b) and (c) indicates the position of the sub pad 15 before the flexible member 22 is deformed.
After that, when the bolt 29 is removed from the screw hole 27, as shown in FIG.
As shown in FIG.
Is in the “retracted position”. A two-dot chain line indicated by reference numeral 15b in FIG. 3C shows a state in which the bolt 29 is screwed into the screw hole 27 of the flexible member 22 and the flexible portion 23 is plastically deformed (FIG. 3B. )), The position of the auxiliary pad 15 is shown.

The flexible member 22 shown in FIGS.
Although the thickness of the flexible portion 23 is smaller than that of the fixed portions 24 and 25, the elastic force generated by the flexible member 22 is appropriately adjusted by changing the thickness of the flexible portion 23 in this manner. can do. Further, in the embodiment of the present invention, as shown in FIG. 4, it is also possible to use a flexible member 30 having a constant overall thickness. Furthermore, as shown in FIG. 5A, a flexible member 31 in which the width of the bending portion 23 is narrower than the fixing portions 24 and 25,
It is also possible to use a flexible member 32 in which the fixing portions 24 and 25 are connected by a plurality of bending portions 23. Further, as shown in FIG. 6, the sub pad 15 is attached to the main pad 14 by using a plurality of flexible members 33 and 34 having different lengths, and each flexible member 3 is attached.
The flexible elastic axes of the flexible members 35 and 36 are controlled by changing the bending centers of the flexible members 35 and 36 or by fixing the flexible members 35 and 36 by offsetting (X) as shown in FIG. It is also possible to optimize the direction of separation and approach of the sub pad 15 with respect to the material.

The operation and effects obtained by the embodiment of the present invention having the above-mentioned structure are as follows. First, in the embodiment of the present invention, the sub pad 15 is formed using the flexible member 22.
Is attached to the main pad 14, and the sub-pad 15 is swung between the "retracted position" and the "press position" by the bending of the flexible member 22 to guide and return the sub-pad 15 to the main pad 14. The movable structure of the sub pad 15, such as the structure, can be a flexible member.
It is established by only 22. Then, the necessary operation of the sub pad 15 with respect to the main pad 14 can be obtained only by bending the flexible member 22. Therefore, unlike the conventional bending die 1, the bending die 21 according to the embodiment of the present invention does not have a sliding mechanism for the sub pad 15 with respect to the main pad 14, and the sliding mechanism There is no deterioration in reproducibility for each press due to backlash. Further, it is not necessary to secure the precision of the components for minimizing the rattling and the adjustment work of each component, which is indispensable to the conventional slide mechanism, and the deformation of the flexible member 22 is high. Due to the reproducibility, the number of steps required for maintenance of the swing mechanism of the sub pad 15 can be significantly reduced.

The flexible member 22 is composed of a flexible portion 23 and fixing portions 24 and 25 for the main pad 14 or the sub pad 15, and the fixing portions 24 and 25 are fixed to the main pad 14 or the sub pad 15. By bending the bending portion 23, the auxiliary pad 15 with respect to the main pad 14 can be minimized with respect to the structure in which the auxiliary pad 15 is rotated using a hinge structure, for example, while minimizing mechanical loss.
The rocking structure of can be established. Moreover, as long as the “press position” of the sub pad 15 is accurately positioned, high accuracy is not required for the position accuracy at the “retracted position” and the intermediate position between the “retracted position” and the “press position”. High precision is no longer required as in the case of using the conventional slide mechanism. Further, when the forming of the negative angle surface Wa for the material W is completed, the auxiliary pad 15
Is returned to the "retracted position" by the elasticity of the bending portion 23 itself of the flexible member 22. Therefore, the movable structure of the sub pad 15 is simplified with respect to the general movable insert of the press die.

In addition, by using the movable members 30 to 36 having various shapes as illustrated in FIGS.
It is possible to appropriately obtain the elastic force required for the swing motion between the retracted position of 15 and the press position, and it is also possible to optimize the direction in which the auxiliary pad 15 is separated and approached the material W. Is. Therefore, according to the embodiment of the present invention, both the installation space and the installation cost of the sub pad 15 movable structure can be reduced, and the quality of the pressed product is improved,
Product cost can be reduced.

[0020]

Since the present invention is constructed as described above, in the bending die, the auxiliary pad is separated from the main pad, and the vicinity of the negative angle surface of the material is sandwiched with the punch from a direction different from the pressing direction. This prevents rubbing and galling in the press direction near the negative angle surface of the material, and simplifies the moving mechanism of the sub pad to reduce both the installation space and installation cost of the movable structure. It is possible to improve product quality and reduce product cost.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a closed state of a bending mold according to an embodiment of the present invention.

FIG. 2 is a view on arrow B in FIG.

FIG. 3 shows a die for bending work according to an embodiment of the present invention,
It is a figure which shows an example of the shaping | molding procedure of a flexible member.

FIG. 4 is a view showing a bending die according to an embodiment of the present invention,
It is sectional drawing which shows another example of a flexible member.

FIG. 5 is a view of a bending die according to an embodiment of the present invention,
It is a perspective view which shows another example of a flexible member.

FIG. 6 is a schematic view showing another example of the structure for attaching the sub pad to the main pad by using the flexible member in the bending die according to the embodiment of the present invention.

FIG. 7 is a schematic view showing still another example of the structure for attaching the sub pad to the main pad using the flexible member in the bending die according to the embodiment of the present invention.

FIG. 8 is a cross-sectional view showing a mold opening state of a conventional bending mold.

FIG. 9 is a cross-sectional view showing a closed state of a conventional bending die.

10 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

2 Lower mold 3 punch 4 Driven cam 5 Processing surface 7 curved blade 8, 12 springs 9 Upper mold 10 Drive cam 11 pads 14 Main pad 15 Vice pad 16, 17 contact surface 21 Mold for bending 22, 30, 31, 32, 33, 34, 35, 36 Flexible member 23 Flexible part 24, 25 fixed part 26 Fastening members W material Wa negative angle surface Wb A plane orthogonal to the pressing direction of the material Wc Near negative surface

Claims (3)

[Claims] 1. A bending mold having a pad having an abutment surface for contacting the vicinity of a negative angle surface of a material on a subpad separated from the main pad, wherein the subpad is attached to the main pad. A bending die having a flexible member that swings the sub pad between a retracted position and a press position by its own bending. 2. The bending die according to claim 1, wherein the flexible member includes a bending portion and a fixing portion to the main pad or the sub pad. 3. A bending mold having a pad provided with a contact surface for contacting the vicinity of a negative angle surface of a material on a sub pad separated from the main pad, wherein the sub pad is connected to the main pad via a flexible member. A method of supporting a sub pad, which is attached to a pad and swingably supports the sub pad between a retracted position and a press position by bending of the flexible member.