JPS60124328A - Machining process for electrode parts of electron gun - Google Patents

Abstract

PURPOSE:To form plural neighboring holes with high accuracy by adding compressive stress at least more than the yielding point of a material to the neighboring peripheries of the holes for forming ring-shaped concave grooves and performing press stamping. CONSTITUTION:Underholes 12, 13 and 14 are formed on a material plate 11 by a press followed by forming the round holes 15, 16 and 17 having the diameter larger than that of the underholes but the same diameters by the press for reducing the neighboring width W. Next, processing is performed while applying compressive stress at least more than the yielding point of the material 11 so that the ring-shaped concave grooves 15' and 17' may be formed on the peripheries of the round holes 15 and 17 on both sides in the range less than the neighboring width W and a heterodiametered ring-shaped concave groove 16' made of a concave groove, where the regional part on the long side is larger than the regional part of the shorter side, may be formed on the periphery of the central round hole 16 respectively for forming a tubular electrode structure 18. Thereby, shifting of the material on the peripheral part of each round hole can be confined thus making the accuracy of the hole diameter and the flatness of the periphery of the hole highly precise.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a method of processing a spare part for a single wire thread, and particularly to a method of forming an electrode part forming a main lens.

[Background of the invention]

In general, in an in-line color father picture tube, the diameter of the lens system of the electron gun electrode is increased as a means of improving focus characteristics.

Conventionally, the structure of this crosspiece was an electrode structure that was formed by pressing a material plate! Electron beam passing holes I Re IQ + l B are arranged in-line, and the holes IR, IO + t
Since the adjacent width W between the two electron beam holes is extremely small, the inner diameter of the central electron beam passage hole lG is large in the short side direction of the barrel body 1, and the long side of the electrode structure l is Convex deformation tends to occur in the direction of the shorter sides, with the maximum at the center. For this reason, the accuracy of the hole diameter of the central electron beam passage hole IQ and the flatness around the hole edge are reduced9, which has the disadvantage that the focus characteristics are more likely to be affected by the shadow V.

[Purpose of the invention]

Therefore, the present invention solves the conventional problem mentioned above with m−+
Its purpose is to provide electrode parts with high cylindrical diameter and superior focus characteristics to the 7C for color picture tubes. I am concerned about the processing method.

[Requirements for invention]

In order to achieve this purpose, in the method of processing sulfur electrode parts for a gun, which involves forming a multiplicity of holes close to each other in the original and old plates, at least a layer of art material is added around the vicinity of the holes. While applying a compressive stress higher than the yield point, an annular H6 is formed and press punching is performed.

[Kanmei no Mi example]

Next, embodiments of the present invention will be described in detail with reference to the drawings.

Figures 2 to 7 are process diagrams showing the manufacturing method -'v11 of electronic competitive parts according to the present invention. In these figures, first, as shown in FIG.
12.13.1 Drill a pilot hole using a press.
4. Form one. In this case, the pilot holes 12, 13, and 14 may also be punched in several parts with smaller diameters in the previous step. Next, as shown in FIG. 3, the aforementioned prepared hole 12.
13.14 Circular hole 3 with a larger diameter and the same diameter
5.16°17 By forming by full press, the proximity (distance Wt) can be made smaller. Next, Fig. 3.

As shown in FIG. 4, the annular grooves 15', +7' and the area on the long side around the hole edge of the central circular hole 16 in the vicinity @W or less around the hole edge of the inner circular hole 15.17. short side III
At least the purple wood board I is formed so that annular grooves 16' having different diameters each having a groove larger than the area of the area are formed.
Processing is performed by press punching while applying a compressive stress equal to or higher than the yield point of I to form a drop-shaped unipolar structure 18. In this case, an annular tool mark remains around the hole edges of the valley holes 15, 16, and 17. Next, as shown in FIG. 6, the flange portion 18a of the electrode assembly I8 has a slight step t due to its structure at the connection portion between the long side and the short side. If a conventional flat tool 19 is used when cutting this flange gtaa, bending stress σ will be generated in the material flange, and the plurality of circular holes 15 drilled in the flat or low part of the bottom of the electrode structure 18 will be generated.
．． 16.17's anakinho becomes more likely to decrease. Therefore, as shown in FIG. 7, by forming the flange part 18a using a cutting tool 20 that matches the shape of the two-edge part 18a of the electrode assembly 18, the machining of the electrode assembly 18 can be carried out at a high height. can be easily maintained. In this case, tool marks remain on the short side of the flange.

According to such a method, grooves 15', 16', and +7' are formed around the edges of each circular hole 15, 16, and 17, respectively, so that each circular hole 15. The movement of the material near J6 and J17 can be restrained, and the hole diameter accuracy and flatness around the hole edges can be refined.

In the above-mentioned embodiments, the case where a circular hole is formed has been explained, but the present invention is not limited to this, and it is possible to use the groove in the case of a square hole or an elliptical hole to obtain the effect of colleagues. Of course, it can be done.

[% light effect]

As explained above, according to the present invention, it is possible to form a plurality of closely spaced holes with a high density, so the aperture of the main lens system can be increased without increasing the pitch of the electron beam passing holes, and the focusing characteristics can be improved. It has an extremely excellent effect of providing excellent high quality electrons for color receivers.

[Brief explanation of drawings]

Figures (a) and (b) show an example of a conventional electrode 4N body with a narrow section and a sectional view thereof, and Figures 2 to 7 show a method of processing electronic audio parts according to the present invention. This is a process diagram showing one example. 11...Material board, J2.13.14 hole prepared, +5.
16.17...Circular hole, 15', 16', l 7'curved concave rr"tL 18...Electrode structure, 18a/Yi flange part, +9; 20...Flange cutting tool .

Claims (1)

[Claims] 1 for an electron gun in which a plurality of holes are formed close to each other in a material plate
A method for processing a 1L steel part, characterized in that a giant press punching process is performed to form an annular recess around the hole while applying compression stress at least higher than the yield point of the material plate around the vicinity of the hole. Processing method for upper electrode parts.