JPS58128631A - Manufacturing method for explosion-proof type cathode-ray tube - Google Patents

Abstract

PURPOSE:To expand the shape of an annular explosion-proof band in similar form even when the band is heated and insert a cathode-ray tube while the central axis of the cathode-ray tube is matching that of the band by heating the band while it is being pulled outside through support metal fittings. CONSTITUTION:An annular explosion-proof band 6 is formed by making both ends of belt-shaped soft steel, stainless steel or the like annulated by welding or making a soft steel sheet, stainless steel sheet or the like annulated by punching. Said annular explosion-proof band 6 that fits support metal fittings 5 on four corners by welding or the like and a cathode-ray tube are mounted on the respective jigs so that the central axes of both the band and cathode-ray tube can coincide with each other. After the annular band 6 is heated at for example 500 deg.C, and the cathode-ray tube is inserted promptly, the cathode-ray tube is tightened by cooling the explosion-proof band 6 and shrinking the band. As a result, even when the explosion-proof band is heated, its shape can be expanded in similar form and the cathode-ray tube can be inserted while the central axis of the cathode-ray tube coincides with that of the band.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This book #4 relates to a method for manufacturing an explosion-proof cathode ray tube, and relates to a method for manufacturing an explosion-proof cathode ray tube, in which an annular explosion-proof band is tightened around the outer periphery of the panel skirt of the cathode ray tube by shrink fitting to the bone. This relates to reform of the manufacturing method.

[Technical background of the invention and its problems]

Conventionally, vjlIk type cathode ray tubes have a U-shaped rim band with support fittings fixed to the outer periphery of the panel skirt, layered with adhesive tape, etc., in order to prevent damage to the cathode ray tube due to fanning, and a tension band that is heated and expanded from above the rim band. When the tension bands are wound together and fixed together near both ends, the panel skirt is tightened by contraction of the tension bands as they cool down, providing an explosion-proof effect.

However, this structure, which uses rim bands and tension bands, has a large number of parts and requires complicated work.
Furthermore, due to the increased weight of cathode ray tubes and the increased cost, recently there has been a structure in which the rim band is removed and tightened only with a tension band, and a structure in which the annular VJfi & band is heated and tightened by shrink fitting has been developed to achieve uniform tightening strength, and the S product. It is widely adopted because it has advantages such as shortening the process and converting the work type to FLAN.

Next, an example of such a fat 4-type cathode ray tube and a circular explosion-proof band is shown in fi1 and 1! This will be explained using A2.

Namely, the panel (1), the panel skirt (2), and the funnel (3) sealed to the panel skirt (2).
A: The cathode ray tube panel skirt (2) consists of 4 hooks (4).The outside of the cathode ray tube panel skirt (2) is attached to the four corners using adhesive tape (not shown).
An annular explosion-proof band (6) fixed with an l-contact or the like is tightened to form an explosion-proof cathode ray tube.

The method for manufacturing the explosion-proof cathode ray tube described above is to first attach the annular explosion-proof band (6) and the cathode ray tube to separate jigs, heat the annular explosion-proof band to, for example, 500"0 to expand, and then quickly remove the cathode ray tube. The annular explosion-proof band is inserted, cooled, and tightened by contraction of the annular explosion-proof band.

Next, the conventional method of heating an annular explosion-proof band is shown in Figures 3 to 5.
To explain with a diagram, the support metal fittings (also referred to as lugs) (5) fixed to the four joints of the annular explosion-proof band (6) are attached to the support parts ( A positioning jig (9) consisting of 8) is provided, and the annular explosion-proof band (6) is heated by this foreshadowing to cause thermal expansion of the annular explosion-proof band (6).

#i The opening (51) is for fitting the explosion-proof cathode ray tube into the television cabinet through bolts, and has the role of determining the relative position of the cabinet and the explosion-proof cathode ray tube. Therefore, in this installation, the opening (5L) is made with a sliding degree, so when installing explosion-proofing, the position of the annular explosion-proof band (6) is usually determined based on the opening (5,). That's good.

In addition, the degree of loose fitting of the protrusion (force and attachment) provided on the support part (8) to the opening (5 ing.

After heating the annular explosion-proof band (6) in this way,
The circular explosion-proof band (61'
Insert an annular explosion-proof band (6) at a predetermined position on the outer periphery of the panel skirt part where adhesive tape is applied to reduce thermal shock and for bonding.
When cooled, the panel skirt is tightened by the 34-shaped fat layer band (6), which has been formed in advance to have a length shorter than the outer circumference of the panel skirt, and a predetermined explosion-proof cathode ray tube is completed.

However, the circular explosion-proof band (6) is made by welding both ends of a strip of mild steel or stainless steel to form a ring, or by punching a mild steel plate or stainless steel plate into a ring shape. Considering that, the coefficient of thermal expansion is 1
40 x 10'/''Q, so it must be heated to soo℃. 480 x 140 x 10-
' becomes. Approximately 1040 wx for a 14 inch cathode ray tube
Since the annular explosion-proof band (6) with a circumference of is used, its elongation amount is about 7 degrees, and the spread from the center of the annular explosion-proof band (6) in the plane direction is 0.75 times. Also, a circular explosion-proof band (
When the elongation of 6) is within the elastic limit, the tightening is smaller and uneven, so the length of the annular explosion-proof band (6) is made smaller from the beginning by an amount that takes into account the corresponding weight and safety factor. The gap between the circular explosion-proof band (6) used to insert the cathode ray tube and the cathode ray tube is approximately 0.4 mm.

In order to facilitate the work of inserting the annular explosion-proof band (6) into the panel skirt of the cathode ray tube, it is necessary to make the above-mentioned Ichinoseki 6i larger, and for this reason, the length of the OJ#-shaped explosion-proof band (6) before heating is made too long. This circular explosion-proof band (6) reduces the tightening force against the brown panel skirt, or the circular explosion-proof band (6)
Explosion-proof performance cannot be ensured because the parts may come off from the panel skirt. If you hide the reverse km too much, you can secure the explosive power of the VJ, but you will not be able to insert it into the panel skirt. Heat am again ^^
There is a limit to how much it can be used for reasons such as the heat resistance of the annular explosion-proof band (6).

In this way, the explosion-proof young fruit and the insertion workability are improved by using the circular explosion-proof band (6
) each has its own limit, and the margin for each is smaller for small cathode ray tubes with smaller circumferences. Furthermore, if manufacturing variations and insertion variations of the annular explosion-proof band (6) and cathode ray tubes are taken into consideration, the problem becomes even more severe. In order to do this, it is necessary to manufacture and manage each part with precision, and to minimize variations during explosion-proof work. match when inserting and that the circular explosion-proof band (
It is important that 6) is not abnormally deformed by heating.

Therefore, it is necessary to position the cathode ray tube so that the center axis of the cathode ray tube matches the center axis of the heated annular explosion-proof band (6).

However, as can be seen from Figures s 1m 3 to 5, the protrusion (7) for positioning with respect to the opening m1 (5,) is installed when the opening is 14111 x 14. The width of part (7) is 101111 in the diagonal direction.
, it is made as small as 13u+ in the left and right direction. The reason for this is to take into account manufacturing variations in the annular explosion-proof band (6) and elongation due to thermal expansion. That is, if the gap between the two is small, each corner will not expand during thermal expansion, and only the sides will expand outward, making it impossible to insert the cathode ray tube.

For this reason, the protrusion (7) and the mounting opening (51)
Since the space between - is large, the annular vj at the time of insertion
The center axis of the blast band (6) and the cathode ray tube are difficult to match.

That is, first position the annular explosion-proof band (6) using the jig 19).
K41! This happens because the annular explosion-proof band (6) does not stretch symmetrically when heated and spreads in the direction of lower resistance.Also, molding distortion and +11J [min. The annular explosion-proof band (6) does not necessarily spread in a similar shape due to variations in the angle.In other words, the corners are generally supported by supports A (5) and have a single resistance, so they spread in the diagonal direction. There aren't many and if you line up, it's J!!W
ig 1m 2.2iua, in the actual example it is 1.4u, and the side part is bent outward by that amount. In the result, the gap with Brown d becomes larger, but in p14s, it becomes smaller.

As mentioned above, when the annular explosion-proof band is heated, if the central axis of the annular explosion-proof band and the central axis of the cathode ray tube are misaligned, or if the annular explosion-proof band does not spread in a similar shape,
Problems such as not being able to be inserted into the cathode ray tube, peeling off the adhesive tape wrapped around the panel skirt of the cathode ray tube, scratching the bulb glass of the cathode ray tube, and problems such as the circular explosion-proof band being installed in a tight manner. There is a point.

[Purpose of the invention]

The present invention is characterized by a series of problems.
To provide a method for manufacturing an explosion-proof cathode ray tube, in which even if the annular explosion-proof band is heated, its shape spreads into a similar shape, and the central axis of the annular explosion-proof band can be inserted while aligning the central axis of the cathode ray tube. It is said that

[Summary of the Invention] That is, the present invention is characterized in that heating is performed while being pulled outward via the annular explosion-proof band support metal fitting.

[Embodiments of the invention]

Next, an embodiment of the method for manufacturing an explosion-proof Brown gun according to the present invention will be described with reference to FIGS. 6 to 8. The same reference numerals as in FIGS. t83 to 5 indicate the same parts, and since the cathode ray tube is the same as in FIG. 1, the description thereof will be omitted.

In this embodiment, the annular explosion-proof band (6) and the cathode ray tube are first attached to separate jigs so that their center axes coincide, and the annular explosion-proof band (6) is
After heating to 0°C, the cathode ray tube is quickly inserted, and then the annular explosion-proof band (6) is cooled and tightened by contraction of the annular explosion-proof band (6), which is made of belt-shaped mild steel. It is formed by welding both shoulders of steel or stainless steel, or by punching a mild steel plate or stainless steel into a ring shape, and has support fittings (5) at the four corners of 11 mm and fixed. is almost the same as the conventional one, but with a circular explosion-proof band (not shown)
6) is equipped with a support S- that is pulled outward in the direction of arrow (2), that is, radially, and this support part (IIK), and the mounting of the support fitting (5) is carried out slightly in the opening (5 m). A positioning jig 0 consisting of a protrusion muη of a size large enough to leave a gap is provided so that a force in the direction of arrow (2) is always applied by the positioning jig ← when heating the annular explosion-proof band (6). This kind of positioning A (11
To use, first place the positioning jig A4 into the four corner supports A (5) of the annular explosion-proof band (6) at room temperature. ) so that the protrusion s s (17) is in a fixed position near the center. Next KjJl-shaped explosion-proof band (6
) Pull in the four directions of the arrows according to the heating temperature. It is desirable to pull this tension amount to a position that matches the theoretical spread amount at the heating end point of 500"O, for example, while keeping the annular explosion-proof band in a similar shape.Next, push the cathode ray tube in and place it on the adhesive tape wrapped around the panel skirt. After this, the annular explosion-proof band (6) is cooled, and at this time, the positioning tool α field is moved in the direction opposite to the arrow (2) according to this cooling.

Next, I tightened the circular explosion-proof band (6)! When the A-type cathode ray tube is removed, the positioning process for JIL will be completed until it reaches the first position.

In the embodiment described above, the explosion-proof band (6) when heated
The tension was carried out radially from the four corners with the center axis as the reference, but this was done by fixing the upper left corner and pulling the other three corners along the broken line (
The same holds true when pulling outward as shown by ^). In this case, the pulling direction will be different, and it goes without saying that the fixed position at of the cathode ray tube must be set differently in accordance with this pulling direction.

According to the manufacturing method of Example #A, first, the first K support metal (
5) The opening and protrusion Q7) 12) - The installation can be made small, and the second is the support metal fitting (5) and positioning jig A9.
Thirdly, the partial deformation of the annular explosion-proof band (6) is corrected by tension, which makes insertion of the cathode ray tube extremely difficult, so the adhesive tape wrapped around the panel skirt is It can even out the peeling of the glass, scratches on the pulp glass, and the positional relationship between the cathode ray tube and the circular explosion-proof band.

In addition, although the tensile structure in the four directions of the arrows was not explained in the example, as an example, in order to ease the accuracy of returning after removing the explosion-proof cathode ray tube with the positioning jig 0, the protrusion w5αη or the position A structure in which a spring acts on the tightening jig Ql can be considered. The standard strength of this spring is to extend the annular explosion-proof band (6) 2m diagonally.
It is the strength when it is pulled. This strength varies depending on the material of the Ml-shaped explosion-proof band (6), its size, and the design of the pond. For example, in the case of a 14-inch pipe, it is cut grams, and in the case of a J-inch pipe, it is 160 grams. If a force greater than this value is applied, the protrusion moves in that direction, and if the force is less than this value, it returns to its original position. In this way, installation is easy even if the dimensions of the annular explosion-proof band vary slightly, and the process is simplified since there is no need to return the positioning jig tlt1 to the intermediate position after the cathode ray tube is inserted, and it is only necessary to return it to the most vJO position. Be easy and accurate.

It goes without saying that a method of automatically moving the positioning jig I using mechanical or electrical means is also conceivable.

(The young fruit of envy) As mentioned in L, if the manufacturing method of the Vj bomb type Braun of the present invention is used, the outer circumference of the panel skirt of the cathode ray tube can be
It is easy to make the shape of the annular band with a short circumference similar to the cross section of the panel skirt that is used during leakage and/or heating, and to obtain a VJ bomb-shaped brown t-shirt with good quality. The industrial value of m is extremely large.

[Brief explanation of drawings]

Figure 41 is a schematic diagram of an example of a VJ-shaped cathode ray tube, Figure 2 is a diagram of the annular explosion-proof band used in Figure 15, and Figures 3 to 5 show the conventional manufacturing method for explosion-proof cathode ray tubes. Figure 3 is a plan view showing foreshadowing on which the positioning jig 1 is placed, and Figure 4 shows the protrusion and support of the positioning jig and its installation through the opening. jj1 showing the relationship with
Fig. 5 is an enlarged view of Fig. 4 taken along the person-entry line @rxr, and Figs. 6 to IJ48 are 1i of the present invention.
! This is a diagram showing the manufacturing power of the J-bomb type Braun. Fig. 6 is a plan view showing a part with a hoop-shaped spun band placed on a positioning jig, and Fig. 7 is a diagram showing the positioning jig. The attachment of the protrusion of the jig and the support fitting is shown in the enlarged view of the seed part showing the relationship with the opening, No. 8.
Figure iJM7 diagram B-H? FIG. ■... Panel 2... Panel skirt 3.
... Funnel 4 ... Neck 5 ... Support money ^
51... Attachment is done through opening 6... Annular Vj leakage band 7, 17... Projection 8.18... Support s9.
19...Positioning jig agent Patent attorney Inoue −
Liu Figure 1 Figure 2,! i7 Figure 4 q Figure 5

Claims (1)

[Claims] 4 of the cathode ray tube on the outer periphery of the panel skirt of the cathode ray tube.
In a method for manufacturing an explosion-proof cathode ray tube, in which IJ-shaped explosion-proof bands are fastened by shrink fitting, with supporting metal fittings fixed in corresponding positions, at least when the m-shaped explosion-proof bands are heated, A manufacturing method for explosion-proof cathode ray tubes whose percentage value is that the tube is pulled in the opposite direction.