KR100344636B1 - Molding method of deflection yoke coil separator - Google Patents

Abstract

The present invention provides a method for forming a DY coil separator that can be molded quickly while preventing the unmolding of the DY coil separator in the mold when the DY coil separator is molded. In particular, the DY coil separator in the mold The main and auxiliary gates are placed at the curved portion and the screen portion and the molten resin is injected at a predetermined distance, and then the molten resin is injected at a constant injection pressure by connecting the main and auxiliary gates with a sprue through a runner. In order to solidify the molten resin injected at a constant injection pressure, a first cooling circuit is formed around the DY coil separator and a second cooling circuit is formed around the neck of the DY coil separator to cool the DY coil separator through the cooling water. The point is to perform the action.

Description

Molding method of deflection yoke coil separator {MOLDING METHOD OF DEFLECTION YOKE COIL SEPARATOR}

The present invention is to quickly prevent the unmolding of the DY coil separator in the mold while forming a separator of the deflection yoke coil (hereinafter referred to as the "DY coil") for deflecting the electronic beam of televisions and monitors. The present invention relates to a molding method of a DY coil separator that can be molded. In particular, a main gate and an auxiliary gate into which resin is injected are spaced apart from the curved portion of the DY coil separator at both sides of the screen portion and the screen portion, and then the resin is applied at an appropriate pressure. The present invention relates to a molding method of a DY coil separator which can prevent deformation of a product while reducing the resin injection pressure and the resin solidification time of the DY coil separator by injecting and cooling the DY coil separator.

In the known molding method of the DY coil separator, as shown in FIG. 1, a gate into which the molten resin is injected into the curved portion 20 and the screen portion 30 of the DY coil separator 10 formed in the mold ( 40 and 40 'are respectively provided, and then the molten resin melted at about 200 ° C. is injected into the gates 40 and 40' at a constant pressure, so that the screen portion 30 of the DY coil separator 10 in the mold is opened. At the same time as the resin is filled, the neck portion 50 through the curved portion 20 to be sequentially filled with the molten resin.

As described above, after the filling of the molten resin is completed in the mold, as shown in FIG. 2, cooling water is injected through the cooling circuit 60 provided around the DY coil separator 10 to solidify the DY coil separator. By shaping, the molding of the DY coil separator is completed.

However, as described above, the molten resin injected through the curved portions 20 and the gates 40 and 40 'formed on the screen portion 30 of the DY coil separator 10 may be formed of the screen portion 30 and the curved portion ( 20) It is impossible to complete the filling of the molten resin to the neck portion 50, which has a relatively thick and complicated structure at the rear end, at the same time, resulting in poor moldability due to the flow imbalance of the molten resin, and uniformity during injection of the molten resin. There is a disadvantage that it is difficult to maintain a pressure distribution.

In addition, when the molten resin is uniformly filled in the screen portion 30 and the neck portion 50 in the mold as described above, a high injection pressure of the molten resin is required to shorten the life of the mold, in particular in FIG. As described above, a cooling circuit 60 for cooling the injection molded DY coil separator 10 is formed at the outer periphery of the neck portion 50, the curved portion 20, and the screen portion 30 of the DY coil separator 10. The cooling water causes the respective parts to cool at about the same rate.

In the case described above, the neck portion 50 of the DY coil separator 10 is relatively thicker than the curved portion 20 and the screen portion 30, and has a complex structure, which is an uncooled portion due to a delay in cooling rate. There are many problems, such as remaining, resulting in molding failure of the DY coil separator.

The present invention has been made in order to improve the various problems as described above, the object of the invention, when molding the DY coil separator, the resin is injected at a predetermined interval spaced apart on both sides of the curved portion and the screen portion of the DY coil separator in the mold After the main and auxiliary gates are installed, the resin is injected at an appropriate pressure, thereby preventing the unmolding of the DY coil separator in advance and enabling rapid molding and of course, the resin injection of the DY coil separator. It is to provide a molding method of the DY coil separator that can reduce the deformation of the product while reducing the pressure and resin solidification time.

Another object of the present invention is to install a separate cooling circuit in the neck portion of the DY coil separator to be molded in the mold, to prevent the defective molding of the DY coil separator due to the solidification failure of the neck portion, DY that can increase the cooling efficiency The present invention provides a method for forming a coil separator.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the metal mold | die for demonstrating the shaping | molding method of the conventional DY coil separator.

2 is a structural diagram of a cooling circuit installed for cooling a conventional DY coil separator.

Figure 3 is a schematic configuration diagram of a mold for explaining the molding method of the DY coil separator according to the present invention.

4 is a plan view showing the gate position of the DY coil separator of the present invention.

5 is a structural diagram of a cooling circuit installed for cooling the DY coil separator of the present invention.

FIG. 6 is a graph showing changes in injection pressure over time when forming a DY coil separator; FIG.

Figure 6a is a graph of the injection pressure change of the conventional DY coil separator.

Figure 6b is a graph of the injection pressure change of the DY coil separator according to the present invention.

7 is a graph showing a change in temperature over time when the DY coil separator cools.

Figure 7a is a graph of the temperature change of the conventional DY coil separator.

Figure 7b is a graph of the temperature change of the DY coil separator according to the present invention.

8 is a graph showing the solidification rate with time of the DY coil separator;

Figure 8a is a graph of the high rate of the conventional DY coil separator.

Figure 6b is a graph of the high rate of DY coil separator according to the present invention.

Explanation of symbols on the main parts of the drawings

DY Coil Separator 110 ...

120 ... Screen 130 ... Neck

150 ... Main Gate 160,160 '... Sub Gate

As a technical configuration for achieving the above object, the present invention relates to the position of the main gate in which the molten resin is injected and is located at the curved surface of the DY coil separator in the mold, the distance (C ') from the screen portion to the neck portion and the screen. The distance (C) ratio of the main gate from the negative portion is set to C / C '= 50-65%, and the position of the auxiliary gate positioned on both sides of the screen portion of the DY coil separator is equal to the diameter (D') of the screen portion and both side auxiliary portions. The distance (D) ratio of the gate is set to D / D '= 35-65% so that the position of the gate (A) and the diameter of the auxiliary gate (B) are 1: 1-2: 1. Setting and positioning the main gate and the auxiliary gate, respectively,

Connecting the main gate and the auxiliary gate with a sprue through a runner to inject molten resin at an injection pressure P of the following formula;

Where Pmax = K + α₁A + α₂C + α₃D + α₄CD

Where K is the reference pressure (Mpa)

α₁, α₂, α₃, α₄ are coefficients

A and B are the diameters of the main and auxiliary gates in mm,

C is the main gate distance from the screen (mm)

D is the distance (mm) of the auxiliary gates located on both sides of the screen portion.

In order to solidify the molten resin injected at the injection pressure according to the above formula, a first cooling circuit is formed around the DY coil separator and a second cooling circuit is formed around the neck of the DY coil separator to form a DY coil through the cooling water. By providing a molding method of the DY coil separator comprising the step of performing the cooling action of the separator.

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

Figure 3 is a schematic configuration diagram of a mold for explaining the molding method of the DY coil separator according to the present invention, Figure 4 is a planar structural diagram showing the gate position of the DY coil separator of the present invention, the mold for molding the DY coil separator Located in the curved portion 110 and the screen portion 120 of the DY coil separator 100 in the main gate 150 and the sub gate (160) (160 ') to which molten resin is injected. ), The ratio of the width C 'of the curved portion 110 of the DY coil separator 100 to the distance C where the main gate 150 is located from the screen portion 120 is C. / C '= 50-65% to position the main gate 150 in the state entered in the curved portion (110).

In addition, the positions of the auxiliary gates 160 and 160 ′ positioned at both sides of the screen unit 120 around the horizontal center portion O of the DY coil separator 10 may include a diameter D ′ and both sides of the screen unit. The distance D of the auxiliary gates 160 and 160 ′ is set to D / D ′ = 35-65%.

Positioning of the main gate 150 and the auxiliary gates 160, 160 ′ of the DY coil separator 100 may include DY coil separators having molten resin injected through the sprue 210 through the runner 220. When flowing into the screen portion and the curved portion of 100, the smooth flow is induced so that when the filling of the molten resin to the relatively thick neck portion 130 is completed, the molten resin filling of the screen portion 120 is completed When the position C of the main gate exceeds 50 to 65% of the width C ′ of the curved portion, the filling time of the molten resin is accelerated to the neck portion and the auxiliary gate positioned to both sides of the screen portion ( Position (D) of the 160 and 160 'is also due to the fact that the filling time of the molten resin proceeds faster toward the screen portion 120 when the diameter D' exceeds 35 to 65%.

Subsequently, the diameter A of the main gate located in the curved portion 110 of the DY coil separator 100 as described above, and the diameter B of the auxiliary gates positioned at both sides of the screen portion 120 are 1: By setting it at a ratio of 1 to 2: 1, when the diameter A of the main gate exceeds twice the ratio of the diameter B of the auxiliary gate, sprue cutting of the main gate 150 when the mold is removed. This becomes difficult, and the main gate marks remain on the curved portion 110 to impair the formability, as well as when the diameter (A) of the main gate is set to less than one times the ratio of the diameter (B) of the auxiliary gate, This is due to the loss of the fluid balance of the molten resin injected into the mold.

On the other hand, while the auxiliary gate 160 is located on both sides of the curved portion 110 and the screen portion 120 of the DY coil separator 100 as described above, the main and auxiliary gates through the runner 220 sprues. By connecting to 210 to inject the molten resin at the injection pressure (P) of the following formula.

That is, Pmax = K + α₁A + α₂C + α₃D + α₄CD

Where K is the standard injection pressure (Mpa)

α₁, α₂, α₃, α₄ are coefficients

A and B are the diameters of the main and auxiliary gates in mm,

C is the main gate distance from the screen (mm)

D is the distance (mm) of the auxiliary gates located on both sides of the screen portion.

The molten resin injected at the injection pressure according to the above formula is filled in the screen portion and the neck portion of the DY coil separator 100 at a uniform speed through the main gate 150 and the auxiliary gate 160. After the injection of the molten resin, the DY coil separator 100 performs a cooling operation through the cooling circuit as shown in FIG. 5.

Referring to the cooling process of the DY coil separator 100 through FIG. 5, first cooling is performed around the neck part 130, the curved part 110, and the screen part 120 of the DY coil separator 100. The circuit 170 is formed to perform a cooling operation by supplying cooling water. In this case, the neck portion 130 of the DY coil separator has a relatively thick thickness due to the characteristics of the DY coil separator and is formed in a complicated structure. By forming a second cooling circuit 180 around the neck portion 130 to perform a cooling operation of the DY coil separator through the coolant, to perform a uniform cooling operation over the entire surface of the DY coil separator 100. Will be.

Hereinafter, an embodiment of the present invention will be described.

The present invention, for forming the DY coil separator 100, the diameter of the main gate (A), the diameter of the auxiliary gate (B) and the position (C) of the main gate, the position (D) of the auxiliary gate, the molten resin The maximum injection pressure (Pmax) was set as shown in Table 1 to form a DY coil separator.

The maximum injection pressure for each of the DY coil separator molded by the Table 1 was measured and the results are shown in Table 1 and Figure 6b.

number Main gate diameter (mm) (A) Auxiliary Gate Diameter (mm) (B) Main gate position (mm) (C) Auxiliary Gate Position (mm) (D) Injection pressure (Mpa) (Pmax) One 4.5 3.5 30 30 350.0 2 4.5 3.5 30 50 205.8 3 4.5 3.5 40 30 244.7 4 4.5 3.5 40 50 250.2 5 4.5 5.5 30 30 350.0 6 4.5 5.5 30 50 195.3 7 4.5 5.5 40 30 236.0 8 4.5 5.5 40 50 223.3 9 6.5 3.5 30 30 287.7 10 6.5 3.5 30 50 173.5 11 6.5 3.5 40 30 226.2 12 6.5 3.5 40 50 211.3 13 6.5 5.5 30 30 292.3 14 6.5 5.5 30 50 184.7 15 6.5 5.5 40 30 219.0 16 6.5 5.5 40 50 212.7

The maximum injection pressure according to Table 1 is displayed in the graph of FIG. 6B, and when compared with the graph showing the conventional injection pressure (FIG. 6A), it can be seen that the injection pressure during molding of the DY coil separator is significantly lower than that in the prior art. In particular, the injection pressure of the neck portion and the screen end in which the molten resin is finally filled during the molding of the DY coil separator is shown to be greatly increased, but in the present invention, it can be seen that the injection molding is performed at a uniform pressure as a whole. .

On the other hand, the DY coil separator injection-molded as described above, the first cooling circuit 170 is formed around the neck portion 130, the curved portion 110 and the screen portion 120 of the DY coil separator 100. In one state, the second cooling circuit 180 is configured around the neck 130 to perform cooling through the cooling water, and the result of the cooling is shown in the graph of FIG. 7B.

Compared with the graph of FIG. 7B, it can be seen that the cooling time of the conventional DY coil separator 100 of FIG. 7A is significantly shorter and that the overall cooling state is maintained uniformly, and that the mold of the DY coil separator of FIG. As shown in the graph showing the solidification time, it was confirmed that the solidification time (FIG. 8B) of the DY coil separator according to the present invention was significantly shorter than the solidification time (FIG. 8A) of the DY coil separator according to the conventional method.

According to the molding method of the DY coil separator according to the present invention as described above, when the DY coil separator is molded, a main gate and an auxiliary gate to which resin is injected are spaced at regular intervals from both the curved portion of the DY coil separator and the screen portion. After that, by injecting the resin at an appropriate pressure to prevent the unmolding of the DY coil separator in advance, it is possible to form quickly, as well as to reduce the resin injection pressure and the resin solidification time of the DY coil separator, It is possible to prevent the deformation of the product in advance, and through the cooling circuit installed separately in the neck portion of the DY coil separator to be molded in the mold, to prevent the molding failure of the DY coil separator due to the solidification failure of the neck portion, and to improve the cooling efficiency. There is an excellent effect that can be increased.

Claims (3)

In the molding method of the DY coil separator, The position of the main gate, which is located on the curved surface of the DY coil separator in the mold, into which the molten resin is injected, is the distance (C ') from the screen portion to the neck portion (C') and the distance (C) ratio of the main gate from the screen portion C / C '. = 50-65%, and the position of the auxiliary gates positioned on both sides of the screen portion of the DY coil separator has a diameter (D ') of the screen portion and a distance (D) ratio of both side auxiliary gates D / D'. Setting the 65% to locate the main gate and the auxiliary gate on both sides of the curved portion and the screen portion; Connecting the main gate and the auxiliary gate with a sprue through a runner to inject molten resin at an injection pressure P of the following equation; Where Pmax = K + α₁A + α₂C + α₃D + α₄CD In the formula, K is the reference pressure (Kg / ㎠) α₁, α₂, α₃, α₄ are coefficients A and B are the diameters of the main and auxiliary gates in mm, C is the main gate distance from the screen (mm) D is the distance (mm) of the auxiliary gates located on both sides of the screen portion. In order to solidify the molten resin injected at the injection pressure according to the above formula, a first cooling circuit is formed around the DY coil separator and a second cooling circuit is formed around the neck of the DY coil separator to form a DY coil through the cooling water. And performing a cooling operation of the separator. The diameter (A) of the main gate and the diameter (B) of the auxiliary gate, which are positioned at both curved portions and the screen portion of the DY coil separator, are set at a ratio of 1: 1-2: 1. Forming method of the DY coil separator, characterized in that. According to claim 1, wherein the first cooling circuit, the neck portion of the DY coil separator, the curved portion and the periphery of the entire screen portion is formed to perform a cooling action, the second cooling circuit is formed around the neck portion of the neck portion of the neck portion Molding method of the DY coil separator, characterized in that to perform a secondary cooling action.