JP2982412B2 - Shadow mask mold - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a shadow mask molding die.

[0002]

2. Description of the Related Art A shadow mask material having a large number of small holes cannot be formed into a regular stable shape unless a tension is applied on the plane of the mold at the time of overhang molding by a press molding die. One example of a conventional molding method is shown in FIGS .

[0003] 8 to 10 are half-cut cross-sectional view of a shadow mask forming mold at each stage of the shadow mask molding process. First, after supply with no load on the top surface of the punch 3 the blank 1 of the shadow mask in the ring body shaped mold plane on the blank holder 2 quadrilateral together according <br/> so as shown in FIG. 8, FIG. 9 The periphery of the blank 1 is sandwiched between the wrinkle presser 2 and the die 4 as shown in FIG. Next, as shown in FIG. 10, the blank 1 is sandwiched between the punch 3 and the pad 5 to perform overhang forming.

[0004]

[0005] However, in the conventional configuration described above, since the natural sagging at the center of the blank during bulging occurs, the problem can not be molded to the regular stable shape Yes Was. Also, since the top surface forming curvature of the shadow mask and the axial length of the small hole are different for each of the two orthogonal axes on the mold plane , if the wrinkle retainer is formed in a ring shape, each of the orthogonal two axes on the mold plane is individually Adjustment of the blank wrinkle holding condition becomes impossible ,
There is a problem in that it is difficult to form a regular shape .

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a shadow mask molding die of the present invention is supported and pressed by a pressure body against a conventional ring-shaped wrinkle holder or a top surface of a die . In the form of an annulus, it is divided parallel to two orthogonal axes on the mold plane.
It has a cracked small wrinkle foot.

[0006]

According to the above construction , the blank can be stretched by applying tension to the blank with a small wrinkle retainer. Also, since the small wrinkle retainer is divided into two parallel to two orthogonal axes on the mold plane , the tension can be adjusted for each of the four sides.

[0007]

An embodiment of the present invention will be described below with reference to the drawings.

First, a prior development example developed by the inventor first
Will be described. Figure
1 to 4 are half sectional views of a shadow mask molding die at each stage of the shadow mask molding process.

As shown in FIG. 1, a blank 11 of a shadow mask is formed into a ring-shaped wrinkle holder 12 and a ring-shaped small wrinkle holder 1.
No. 3 is supplied to the top surface of the punch 14 without load so as to cover all four sides on the die plane. The small wrinkle presser 13 is supported and pressed by the spring 15 from the wrinkle presser 12. As shown in FIG. 2, when the die 16 moves downward together with the pad 17, the peripheral portion of the blank 11 is first held between the small wrinkle presser 13 and the die 16. When the die 16 and the pad 17 further move downward, the die 16
The compact wrinkle presser 13 is pushed down while compressing the spring 15 via the. At this time, the top surface forming portion of the blank 11 is pulled in the direction from the center toward the outer periphery, and the slack in the state where the blank 11 is supplied is eliminated. The small wrinkle presser 13 and the wrinkle presser 12 complete the bottoming by the die 16, and the tensile force applied to the blank 11 at this time is maximized. This maximum tensile force can be managed by the clearance length between the small wrinkle retainer 13 and the wrinkle retainer 12 and the initial set pressure of the spring 15. When the die 16 and the pad 17 are further moved downward by the outer cylinder 18 and the inner cylinder 19, respectively, the top surface of the opening of the blank 11 is formed while pushing down the cushion cylinder 20, and as shown in FIG. 14 bottoms out via the blank 11 to complete the top surface overhang forming. Further, the outer cylinder 18 includes a die 16, a blank 11, a small wrinkle presser 13,
The cushion cylinder 20 is pushed down through the wrinkle retainer 12 to squeeze out the peripheral side wall portion of the blank 11, and the squeezing is completed as shown in FIG. The wrinkle foot 12
The opposite die 16 has been described as being vertically movable.
However, the die 16 may be fixed as before.
Things.

As described above, according to the prior development example , the ring-shaped small wrinkle holder is provided on the top surface of the ring-shaped wrinkle holder having the conventional function, thereby forming the blank top surface overhang in the shadow mask forming process. Before, the blank can be tensioned. Moreover, the tensile force is as described above.
Can do easily performed that the adjustment of the stroke and pressure of the small blank holding as. However, tension on each of the four sides
The condition could not be adjusted.

An embodiment of the present invention will be described below with reference to FIG . In FIG. 5 , 21 is a blank,
22 is an annular wrinkle holder, 24 is a punch, 25 is a spring,
26 is a die, 27 is a pad, 28 is an upper outer cylinder,
29 is an inner cylinder, 30 is a lower outer cylinder, and the above is the same as the configuration of FIG. 1 in that the small wrinkle retainer 23 is divided into four parts.
FIG. 6 shows an example of the division. This is a simplified view of the lower mold as viewed from above .

The basic operation of the shadow mask molding die configured as described above is the same as that of the previously developed example described above .

As described above, by dividing the small wrinkle holder into four parts, it is possible to adjust the tension before forming the top surface on each of the four sides of the blank. If the direction of poor moldability and easy springback, that is, the direction of large radius of curvature, or the long axis direction of the oval-shaped small hole existing on the curved surface is set to the highest tension, the uniform overhang force is applied to the curved surface to be molded. And a curved surface having a predetermined shape can be obtained with high accuracy.

[0014] In addition, the spring 15 in the preceding development example, or
Although the spring 25 is a coil spring in the above embodiment, it may be an elastic body such as urethane or rubber. Also arranged a small wrinkle holding the blank-holding, but it is also possible to arrange a small wrinkle holding 43 in the die 46 as shown in FIG. In addition, in FIG. 7, 41 is a blank, 42 is
Wrinkle holder, 43 is a ring-shaped small wrinkle holder, 44 is pan
H, 45 is a spring, 46 is a die, 47 is a pad, 48 is
Outer cylinder, 49 is inner cylinder, 50 is cushion
Cylinder.

[0015]

As described above, the present invention provides a wrinkle holder or
Ring-shaped die pressed and supported by a pressure body on the top surface of the die
By providing the small wrinkle retainers divided in parallel to two axes perpendicular to each other on a plane, a slack at the time of material supply can be eliminated, and a regular stable top surface shape can be obtained. Also according to each difference of arbitrarily set curvature and holes form the vertical and horizontal tension of the short side and the long side material, can adjust the tension of the material, precision good top shape is obtained .

[Brief description of the drawings]

FIG. 1 shows a half of a blank supply state in a molding process of a shadow mask molding die as a prior development example previously developed by the present inventors.
截 a cross-sectional view

FIG. 2 is a half cross - sectional view of a state in which a blank is sandwiched in a shadow mask molding process in the prior development example .

FIG. 3 is a half - sectional view of a shadow mask forming process in a state where the top surface is overhanging in the prior development example .

FIG. 4 is a half - sectional view of a shadow mask forming process side wall drawn state in the prior development example .

FIG. 5 shows a shadow mask molding in one embodiment of the present invention.
Mold cutting process

FIG. 6 is a view showing a lower mold of a shadow mask molding die in the embodiment .

FIG. 7 shows a shadow mask according to another embodiment of the present invention.
Half cutaway view of mold

FIG. 8 is a half cross - sectional view of a conventional shadow mask molding die in a molding process blank supply state.

[9] half-cut cross-sectional view of the molding process the blank clamped state of the shadow mask molding die

FIG. 10 is a half cross - sectional view of the shadow mask molding die in a state where the top surface of the molding die is overhanging.

[Explanation of symbols]

 12 ring-shaped wrinkle holder 13 ring-shaped small wrinkle holder 14 punch 16 die 17 pad 23 divided small wrinkle holder

Continuation of the front page (56) References JP-A-61-86032 (JP, A) JP-A-59-175428 (JP, U) JP-A-64-49324 (JP, U) (58) Fields investigated (Int) .Cl. ⁶ , DB name) B21D 24/04 B21D 22/26 B21D 24/06 H01J 9/14

Claims (1)

(57) [Claims] 1. A a punch fixed to one of the die sets, the vertical-friendly than the other die set facing the punch
A pad supported by the pressure member in movement, a die to wheel <br/> Guo of the punch is supported by the rice and the other die set a predetermined distance, one of the die facing the die and a ring-like wrinkle presser supported by the pressure body from the upper and lower movable set, the wrinkle on the mold plane orthogonal pressing or supporting the pressed ring-shaped pressure member to the top surface portion of the second axis
A shadow mask forming die, characterized in that it has a small wrinkle holder divided in parallel with the mold.