JP3925636B2 - Method of supporting mold for bending and auxiliary pad - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a metal mold for bending work having a pad provided with a contact surface against the vicinity of a negative angle surface of a material on a sub pad separated from a main pad.
[0002]
[Prior art]
The bend processing method is a processing method in which a surface shape (negative angle surface) having a negative angle with respect to the press direction is bent using a cam mechanism. FIG. 8 shows the mold open state of the conventional curve processing mold 1 for enabling such a processing method, and FIG. 9 shows the mold closed state of the conventional curve processing mold 1. Show. 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 driven cam 4 that is slidably supported with respect to the punch 3 in a direction perpendicular to the pressing direction (vertical direction in FIGS. 8 to 10). ing. A processed surface 5 for forming a negative angle surface Wa (see FIG. 9) on the material W is formed on the punch 3. Further, the driven cam 4 is provided with an inclined surface 6 that is inclined with respect to the pressing direction, and a curved blade 7 and a spring 8 for pressing a sub pad to be described later are fixed.
[0003]
On the other hand, a drive cam 10 is directly fixed to the upper die 9 and a pad 11 is fixed via a spring 12. The drive cam 10 is formed with an inclined surface 13 for sliding contact with the inclined surface 6 of the driven cam 4. The pad 11 includes a main pad 14 and a sub pad 15 separated from the main pad 14. The main pad 14 has a contact surface 16 with respect to a plane Wb perpendicular to the pressing direction of the material W, and the sub pad 15 Has a contact surface 17 with respect to the negative angle surface vicinity Wc. Further, a spring 18 is arranged between the main pad 14 and the sub pad 15, and as shown in FIG. 10, a slide guide 19 fixed to the sub pad 15 is replaced with a slide rail 20 fixed to the main pad 14. Slidably supported in a direction perpendicular to the pressing direction.
[0004]
According to the above structure, in the mold open state shown in FIG. 8, the sub pad 15 is in the “retracted position” farthest away from the main pad 14 in the direction perpendicular to the press direction by the elastic force of the spring 18. When the upper die 9 is lowered toward the lower die 2 for clamping, the abutment surface 16 of the main pad 14 abuts on a plane Wb orthogonal to the pressing direction of the material W, and between the punch 3 The material W is sandwiched and the inclined surface 13 of the drive cam 10 comes into contact with the inclined surface 6 of the driven cam 4, causing the driven cam 4 to approach 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 moved by the spring 8 of the driven cam 4. , The sub pad 15 is slid to the “press position”, and the vicinity of the negative angle surface Wc of the material W is clamped together with the punch 3. When the formation 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 is raised, and the sub pad 15 is also moved to the “retracted position” shown in FIG. Returned.
[0005]
As described above, the conventional bending mold 1 separates the sub pad 15 from the main pad 14 and slides the sub pad 15 in the direction orthogonal to the pressing direction to make the vicinity of the negative angle surface of the material W. By sandwiching Wc together with the punch 3, it is possible to prevent the rubbing or galling in the press direction in the vicinity of the negative angle surface Wc of the material W, thereby improving the quality of the pressed product.
[0006]
[Problems to be solved by the invention]
However, the conventional bend processing mold 1 has the following problems. First, in the sliding mechanism of the sub pad 15 with respect to the main pad 14, 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 May adversely affect the reproducibility. In addition, it is indispensable to ensure the accuracy of parts to minimize the looseness of the subpad 15 and to adjust each part. In addition, the slide mechanism of the secondary pad 15 has a movable structure (guide structure, return structure, etc.) equivalent to the general movable insert of the press die, so that it can move with respect to the movable amount required for the secondary pad 15. The structure becomes large, and both the installation space and the installation cost of the movable structure are increased.
[0007]
The present invention has been made in order to solve the above-mentioned problems, and the object of the present invention is to separate the sub-pad from the main pad in the mold for bending, and to remove the material from a direction different from the press direction. By holding the vicinity of the negative angle surface together with the punch, it is possible to prevent the occurrence of rubbing and galling in the press direction near the negative angle surface of the material, and simplify the movable mechanism of the sub pad, and install the movable structure By reducing both space and installation costs, the quality of press products is improved and product costs are reduced.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a metallurgy mold according to claim 1 of the present invention has a pad provided with a pad provided with a contact surface against the vicinity of a negative angle surface of a material on a subpad separated from the main pad. As a flexible member that is a machining die, attaches the sub pad to the main pad, and swings the sub pad between a retracted position and a press position by its own bending , It has a leaf | plate spring which consists of the adhering part with respect to the said main pad, and the adhering part with respect to the said subpad .
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 utilized to make the elastic member within the range of elastic deformation. The secondary pad fixed to the flexible member is moved (oscillated) so as to draw an arcuate path, whereby the secondary pad can be moved between the retracted position and the press position. Therefore, the movable structure of the auxiliary pad such as the guide structure and the return structure of the auxiliary pad with respect to the main pad can be established only by the flexible member.
[0009]
Further, according to the present invention, the flexible member has a bending portion, a fixing portion for said main pad, a plate spring ing from the fixing portion with respect to the sub pad, the fixing portion and the main pad or By adhering to the sub-pad and bending the bending portion, the sub-pad movable structure such as a guide structure and a return structure of the sub-pad with respect to the main pad is established while minimizing mechanical loss. Can do.
[0010]
In addition, in order to solve the above-mentioned problems, a sub-pad support method according to claim 2 of the present invention includes a pad having a pad provided with a contact surface for the vicinity of the negative angle surface of the material on the sub-pad separated from the main pad. In the bending mold, the sub pad is attached to the main pad via a flexible member configured by a plate spring including a bending portion, a fixing portion to the main pad, and a fixing portion to the sub pad. The auxiliary pad is swingably supported between the retracted position and the press position by mounting and bending of the flexible member.
According to the present invention, the sub pad is attached to the main pad via a flexible member, and the sub pad is swingably supported between the retracted position and the press position by bending of the flexible member. Thus, the necessary operation of the sub pad with respect to the main pad is performed by a flexible member constituted by a leaf spring including the bending portion, a fixing portion with respect to the main pad, and a fixing portion with respect to the sub pad . It can be obtained only by bending.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Here, the same parts as those in the prior art and corresponding parts are denoted by the same reference numerals, and detailed description thereof is omitted.
[0012]
FIG. 1 shows a closed state of a bending mold 21 according to an embodiment of the present invention. Although the upper mold is not shown in FIG. 1, the curve forming mold 21 has a drive cam 10 directly fixed to the upper mold and a pad 11 as in the prior art shown in FIGS. Is fixed through a spring 12. In addition, the springs 8 and 12 may be coil springs as shown in FIG. 1, or urethane springs similar to those of the prior art (FIGS. 8 and 9) and other elastic bodies may be used.
A bend machining die 21 according to an embodiment of the present invention includes a pad 11 provided with a contact surface 17 for a negative angle surface vicinity Wc of a material W on a sub pad 15 separated from a main pad 14. is there. Then, the auxiliary pad 15 is attached to the main pad 14, and the auxiliary pad 15 has a flexible member 22 that swings between a “retracted position” and a “press position” described later by its own bending. is there. The flexible member 22 is a leaf spring including a bending portion 23, a fixing portion 24 for the main pad 14, and a fixing portion 25 for the sub pad 15. 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 a fastening member 26 such as a bolt. As a 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.
[0013]
Further, in a steady state, the flexible member 22 has a slight warp as shown by a two-dot chain line in FIG. 1, and the sub pad 15 is placed in a “retracted position” that is separated from the material W. is doing. 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 the sub-pad 15 is moved from the “retracted position” to FIG. 1. It is possible to move to the “pressing position” indicated by the solid line in FIG. A negative angle surface Wa can be formed on the material W by the processed surface 5 of the punch 3 and the curved blade 7 of the driven cam 4. When the formation of the negative angle surface Wa with respect to the material W is completed, the driven cam 4 is separated from the punch 3 with the rise of the pad 11, and the sub pad 15 is again “by the elasticity of the bending portion 23 itself of the flexible member 22. It is returned to the “retraction position”.
As shown in FIGS. 1 and 2, the flexible member 22 is thin in the sliding direction of the driven cam 4, and is formed wide in the direction perpendicular to the sliding direction of the driven cam 4. It is possible to prevent the displacement of the sub pad 15 in the direction orthogonal to the sliding direction of the driven cam 4 while allowing the sub pad 15 to be swung by bending the bending portion 23. Since the flexible member 22 itself has a cushioning property in the sliding direction of the driven cam 4, the spring 8 can be replaced with a rigid body when the dimensional accuracy of each member is guaranteed.
[0014]
Here, referring to FIG. 3, the flexible member 22 is allowed to be in a mode in which the sub-pad 15 is placed in a “retracted position” away from the material W by exhibiting a slight warpage in its steady state. An example of the forming procedure of the flexible member 22 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 a fastening member 26 such as a bolt. A screw hole 27 is formed in advance in the bending portion 23 of the flexible member 22. At this time, the flexible member 22 is not warped. 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 contact surfaces 16 and 17 with respect to the material are formed by the cutting tool 28. The formation of the main pad 14 and the contact surface 16 and the formation of the contact surface 17 of the subpad 15 may be performed in separate steps in advance.
[0015]
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 and deformed until the bending portion 23 of the flexible member 22 reaches the plastic deformation region from the elastic deformation region. A two-dot chain line indicated by reference numeral 15 a in FIGS. 3B and 3C indicates the position of the sub pad 15 before the flexible member 22 is deformed. Thereafter, when the bolt 29 is removed from the screw hole 27, as shown in FIG. 3C, the warped portion 23 remains warped, and the sub pad 15 is placed in the “retracted position”. The two-dot chain line indicated by reference numeral 15b in FIG. 3C is a state in which the bolt 29 is screwed into the screw hole 27 of the flexible member 22 and the bending portion 23 is plastically deformed (FIG. 3B). The position of the sub pad 15 in ()) is shown.
[0016]
In addition, although the flexible member 22 shown in FIGS. 1-3 has made the thickness of the bending part 23 thin with respect to the adhering parts 24 and 25, changing the thickness of the bending part 23 in this way Thus, the elastic force generated by the flexible member 22 can be adjusted appropriately.
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 narrowed with respect to the fixing portions 24 and 25, and a plurality of bending portions 23 are connected between the fixing portions 24 and 25. It is also possible to use a flexible member 32. Further, as shown in FIG. 6, the sub pad 15 is attached to the main pad 14 using a plurality of flexible members 33 and 34 having different lengths, and the bending center of each flexible member 33 and 34 is changed. As shown in FIG. 7, the flexible members 35 and 36 are fixed by being offset (X), thereby controlling the flexural elastic axis of the flexible members 35 and 36 and separating the auxiliary pad 15 from the material. It is also possible to optimize the approach direction.
[0017]
The effects obtained by the embodiment of the present invention having the above-described configuration are as follows. First, in the embodiment of the present invention, the sub pad 15 is attached to the main pad 14 by using the flexible member 22, and the flexible member 22 is bent between the “retraction position” and the “press position”. By swinging the sub pad 15, the movable structure of the sub pad 15, such as a guide structure and a return structure of the sub pad 15 with respect to the main pad 14, is established only by the flexible member 22. The necessary operation of the sub pad 15 with respect to the main pad 14 can be obtained only by the bending of the flexible member 22.
For this reason, unlike the conventional curve processing mold 1, the curve processing mold 21 according to the embodiment of the present invention does not have the slide mechanism of the sub pad 15 with respect to the main pad 14, and the There is no deterioration in reproducibility for each press due to backlash. In addition, it is indispensable for the conventional slide mechanism, and it is not necessary to ensure the accuracy of the parts to minimize backlash and to adjust each part, and the deformation of the flexible member 22 is high. Since it has reproducibility, the number of steps required for maintenance of the swing mechanism of the sub pad 15 can be significantly reduced.
[0018]
The flexible member 22 includes a bending portion 23 and fixing portions 24 and 25 to the main pad 14 or the sub pad 15. The fixing portions 24 and 25 are fixed to the main pad 14 or the sub pad 15 to be bent. By bending the portion 23, for example, a structure in which the sub pad 15 is rotated using a hinge structure, a swing structure of the sub pad 15 with respect to the main pad 14 is established while minimizing mechanical loss. be able to. In addition, 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 intermediate position between the “retract position” and “retract position” and “press position”. In itself, high accuracy is not required as in the case of using a conventional slide mechanism. Further, when the formation of the negative angle surface Wa with respect to the material W is completed, the sub 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.
[0019]
In addition, the use of FLEXIBLE member 30-36 availability of various forms as illustrated in FIGS. 4 to 7, is required for the swinging motion between a retracted position and a press position of the sub-pad 15 It is possible to appropriately obtain the elastic force, and it is also possible to optimize the direction in which the auxiliary pad 15 is separated from the material W.
Therefore, according to the embodiment of the present invention, it is possible to reduce both the installation space and the installation cost of the movable structure of the sub pad 15 , and it is possible to improve the quality of the pressed product and reduce the product cost. .
[0020]
【The invention's effect】
Since the present invention is configured as described above, in the bending mold, the sub pad is separated from the main pad, and the vicinity of the negative angle surface of the material is clamped together with the punch from a direction different from the press direction. Prevents rubbing and galling in the press direction near the negative angle surface, and simplifies the movable mechanism of the secondary pad, reducing both the installation space and installation cost of the movable structure, and improving the quality of the pressed product. It is possible to reduce the product cost.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a closed state of a bending mold according to an embodiment of the present invention.
2 is a view as seen from the arrow B in FIG.
FIG. 3 is a diagram showing an example of a procedure for forming a flexible member of the bending mold according to the embodiment of the present invention.
FIG. 4 is a cross-sectional view showing another example of the flexible member of the bending mold according to the embodiment of the present invention.
FIG. 5 is a perspective view showing another example of the flexible member of the bending mold according to the embodiment of the present invention.
FIG. 6 is a schematic view showing another example of a structure in which a secondary pad is attached to a main pad using a flexible member in the bending mold according to the embodiment of the present invention.
FIG. 7 is a schematic view showing still another example of a structure in which a sub pad is attached to a main pad using a flexible member in the bending mold 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 mold.
10 is a cross-sectional view taken along the line AA of FIG.
[Explanation of symbols]
2 Lower mold 3 Punch 4 Follower cam 5 Machining surface 7 Curved blade 8, 12 Spring 9 Upper mold
10 Drive cam
11 Pad
14 Main pad
15 Secondary pad
16, 17 Contact surface
21 Die for processing
22, 30, 31, 32, 33, 34, 35, 36 Flexible member
23 Flexure
24, 25 Adhering part
26 Fastening member W Material Wa Negative angle surface Wb Plane surface Wc orthogonal to material pressing direction Near negative angle surface

Claims (2)

A metallurgy mold having a pad provided with a contact surface against the vicinity of a negative angle surface of a material on a subpad separated from the main pad, the subpad being attached to the main pad, and the subpad being As a flexible member that swings between a retracted position and a press position by its own bending, it has a leaf spring including a bending portion, a fixing portion to the main pad, and a fixing portion to the sub pad. The mold for the bend processing. In a bending mold having a pad provided with a contact surface against the vicinity of the negative angle surface of a material on a subpad separated from a main pad, a bending portion, a fixing portion to the main pad, and a fixing portion to the subpad through a flexible member constituted by a plate spring made of a, attaching the auxiliary pad to said main pad, between a retracted position and the press position by flexure of said flexible member, said auxiliary pad rocking A sub-pad support method, wherein the sub-pad is movably supported.

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