JP2553592B2 - Shadow mask molding equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a shadow mask molding apparatus used in a process of manufacturing a shadow mask for a color picture tube.

BACKGROUND ART Generally, a shadow mask for a color picture tube is a metal flat plate having a large number of pores (hereinafter referred to as a flat mask plate).
Is obtained by press molding into a cap shape, and the press molding is the fourth
It is performed using a molding die as shown in the figure. That is, the knockout 2 provided in the lower mold table 1 has a spherical molding concave surface 3, and the punch 5 provided in the upper mold table 4 has a spherical molding convex surface 6. Then, the upper die stand 4 and the punch 5 are sequentially lowered,
A flat mask plate (not shown) laid flat on the lower die stand 1 is press-molded into a cap shape. Lubricating oil sprayed from the nozzle 7a of the spray device 7 is molded before or after this press molding. Wearing the mold reduces wear on the mold. In addition, the lowered upper mold table 4 functions together with the lower mold table 1 to suppress the wrinkles generated around the flat mask plate during molding.

Problems to be Solved by the Invention By the way, when the lubricating oil is supplied to the molding die by spraying as described above, not only is it difficult to supply the necessary amount of oil to the necessary places, but also most of the scattered oil is molded. It adheres to places other than the mold and is not only economically expensive, but also contaminates the work environment, and an oil layer is not easily formed between the flat mask plate and the concave surface of the lower mold stand and knockout. Therefore, wrinkles are likely to occur around the shadow mask during molding, and the curved surface of the shadow mask may be deformed when the punch comes out of the shadow mask completion position (punch bottom dead center) (when the punch rises). there were.

Means for Solving the Problems According to the present invention, there is provided an upper die table in which a punch having a molding convex surface is incorporated, and a mounting surface surrounding a knockout having a molding concave surface and on which a flat mask plate is mounted. A lower die stand is provided, and the mounting surface is inclined toward the bottom surface side of the molding concave surface, and a large number of oil supply holes are scattered on the top of the mounting surface.

Operation With this configuration, the lubricating oil that has flowed out of the hole flows into the knockout concave surface from the top of the lower mold table, and there is an appropriate amount between the flat mask plate and the lower mold table mounting surface and the knockout concave surface. Since the oil layer of can be formed, the waste of oil and the environmental pollution due to the scattering of lubricating oil at the time of lubricating oil supply,
In addition, wrinkles that occur in the periphery of the shadow mask during molding are caused by the lack of lubricating oil between the shadow mask and the concave surface of the knockout when the punch comes out from the molding completion position of the shadow mask. The curved surface deformation can be prevented.

EXAMPLE The present invention will be described with reference to the illustrated example. As shown in FIG. 1, a knockout 9 installed in a lower mold table 8 has a spherical molding concave surface 10. The flat mask plate 11 is press-molded into a hat shape by the spherical molding convex surface 6 of the punch 5 of the die stand 4, as is conventional. However, as shown in FIGS. 1 and 2, the lower mold table 8 has a mounting surface on which the flat mask plate 11 is mounted, and the mounting surface is the molding concave surface 10 of the knockout 9.
Of the refueling device 13 is inclined toward the bottom side of the mounting surface, and a large number of openings 12a are scattered on the top of the mounting surface. Filling port 13
It differs from the conventional configuration in that it is connected to a. However,
The multiple holes 12 may be connected to a common hole inside the lower mold table 8, and in this case, the lubricator 13 may be one.

When the power pump of the lubricator 13 is instantaneously driven prior to press molding, a large number of openings 12 on the top surface of the lower mold stand 8 are formed.
a Lubricating oil jets out, and this lubricating oil flows from the top surface of the lower die stand 8 onto the concave surface 10 of the knockout 9. Next,
The flat mask plate 11 is placed on the lower mold table 8 and the upper mold table 4 and the punch 5 are sequentially lowered. First, the action of the upper mold table 4 to press the peripheral portion of the flat mask plate 11 is performed. Eggplant Then punch 5 knocks out 9
The state shown in FIG. Thereafter, the knockout 9 is raised to complete the press molding process.

In the above-described embodiment, the lubricating oil was jetted using the pump pressure of the lubricator 13. However, at the end of the pressing process (when the punch is raised), the lower mold table 8 and the upper mold table 4 are in contact with each other. By utilizing the fact that the pressure is reduced between the two parties, the lubricating oil may be drawn in between the two through the opening 12a by a vacuum suction action. In this case, it is not necessary to provide the oil supply device 13 with a power pump function. .

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the waste of oil due to the scattering of lubricating oil at the time of refueling, environmental pollution, wrinkles occurring in the peripheral portion of the shadow mask during molding, and the molding completion position of the shadow mask The curved surface deformation of the shadow mask when the punch comes out can be eliminated.

[Brief description of drawings]

FIG. 1 is a side sectional view of a shadow mask molding apparatus according to the present invention, FIG. 2 is a plan view of the lower mold stand side of the apparatus, and FIG.
FIG. 4 is a side sectional view for explaining a press molding process by the same apparatus, and FIG. 4 is a side sectional view for explaining a press molding process by a conventional shadow mask molding apparatus. 4 ... Upper mold base, 5 ... Punch, 8 ... Lower mold base,
9 ... knockout, 12 ... hole, 12a ... opening, 13 ...
Lubricator.

Claims (1)

(57) [Claims] 1. An upper die stand in which a punch having a molding convex surface is incorporated, and a knockout having a molding concave surface is surrounded.
A lower mold stand having a placement surface on which the flat mask plate is placed, and the placement surface inclines toward the bottom side of the molding concave surface, and a large number of oiling holes are provided at the top of the placement surface. A shadow mask molding device, which is characterized in that: