KR100531219B1 - Injection molding method of terminal inserted plastic mold and inserting terminal - Google Patents

Abstract

The present invention relates to an injection molding method of a terminal insert molding and a molding insertion terminal used in the injection molding method, and more particularly, an injection in which electrical stability is secured by minimizing or preventing external exposure of a terminal to be inserted. The present invention relates to a molding method and a terminal for inserting a molding to enable a mold manufacturing and a shortening of an injection cycle time since the use of a positioning pin used for fixing a terminal and preventing bending during injection is unnecessary.

A first aspect of the injection molding method of a terminal insert molding according to the present invention comprises: temporarily fixing a terminal on which one or more supporting protrusions protruding on one or both sides of a body is formed on an inner wall of one of the molds forming the jaw; Clamping the molds to inject and solidify the molten molding resin into a space between the inner walls of the molds; It characterized in that it comprises a step of releasing the obtained injection molding by releasing the clamping state of the molds.

Description

Injection molding method of terminal insert molding and terminal for molding insert {INJECTION MOLDING METHOD OF TERMINAL INSERTED PLASTIC MOLD AND INSERTING TERMINAL}

The present invention relates to an injection molding method of a terminal insert molding and a molding insertion terminal used in the injection molding method, and more particularly, an injection in which electrical stability is secured by minimizing or preventing external exposure of the inserted terminal. It relates to a molding method, and a terminal for inserting a molding to replace the use of the position fixing pin used for fixing the position and bending of the terminal during injection.

Recently, the popularity of rolling element assemblies, such as actuators in which rolling elements are disposed in a plastic injection molded case, has been gradually expanded. In the rolling element assembly, an external current is applied to the rolling element accommodated in the case through a metal terminal disposed in the case.

In order to arrange the long metal plate-shaped terminal in the plastic case formed by injection molding, a plurality of mounting holes are formed along the body of the terminal, and the terminal is formed by fusion of the adhesive material in the mounting hole. Adhering to the case has traditionally been adopted. However, according to this form, as described above, to form a plurality of installation holes in the body of the terminal, in order to ensure the durability of the proper terminal, the width of the portion in which the installation hole is formed should be expanded than other parts, so finally Since the installation hole must be formed along the body, the area occupied by the terminal is not only wider and poor in appearance, but also the fusion process causes a complicated manufacturing process.

Therefore, in recent years, a method has been adopted in which a terminal is inserted into a mold during injection molding of the case so that the terminal is inserted into the case. When the terminal is inserted into the case and molded, the dual process of forming the case separately and fusing the terminal to the inner wall of the case is unified, thereby ensuring convenience of manufacturing and improving the shape of the terminal to secure electrical stability. Can be.

In the conventional method of obtaining a molded product in which the terminal is inserted, the terminal T is temporarily fixed to the inner wall of the first mold 20 or the second mold 30 provided to face each other as shown in FIG. After clamping the molds 20 and 30, a plurality of cylindrical positioning pins P are inserted from both sides to sandwich the terminal T, and then melted in the space S between the molds 20 and 30. After the molding resin (M) is injected to form a molding (case), the position fixing pin (P) is removed, the molding (case) has been made in the order of removing from the mold. Here, the position fixing pin (P) is used to prevent the body of the plate-shaped terminal (T) is bent or displaced in the process of high-temperature molten molding resin is injected at high pressure during the injection molding process.

However, according to this conventional process, in order to fix the position of the terminal (T) or to prevent bending, it is necessary to install the position fixing pin (P) as described above, and the addition and removal of the position fixing pin (P) before and after injection Since the process must go through, the cost is increased and the time per cycle is long, there is a problem that the productivity is lowered. And since the shape of the positioning pin (P) is made of a relatively large cylindrical contact area with the terminal (T) is sandwiched and the surface contact with the terminal, after the position fixing pin is detached from the molding to the finished molding Fixing pin holes, which are relatively large cylindrical marks, are created.

In addition, the fixing pin hole penetrates the plastic case from the outside to the terminal made of metal, which may cause corrosion or damage to electrical stability when water leaks, leaks, or contact with a conductor. .

The present invention has been made to solve the problems in the conventional terminal insert molding and the molding process described above, in manufacturing the injection molding with the terminal inserted, the electrical safety of the product is improved, and the manufacturing cost during manufacturing And it is an object of the present invention to provide an injection molding method of a terminal insert molding that can improve the productivity.

It is also an object of the present invention to provide a terminal for inserting a molded article of an improved shape which is used in such an injection molding method, which makes it unnecessary to use a positioning pin.

The injection molding method of the terminal insert molding according to the first aspect of the present invention for achieving the above object,

Temporarily fixing the terminal having one or more supporting protrusions protruding on one or both sides of the body to an inner wall of one of the molds forming the jaw; Clamping the molds to inject and solidify the molten molding resin into a space between the inner walls of the molds; It characterized in that it comprises a step of releasing the obtained molding by releasing the clamping state of the molds.

And the injection molding method of the terminal insert molding according to the second aspect in the present invention;

Temporarily fixing the terminal to the inner wall of one of the molds forming the jaw; After clamping the molds, one side or both sides of the front or rear surface of the terminal body are clamped in point contact state using a positioning pin having a pointed tip; Injecting and solidifying the molten molding resin into the spaced spaces between the inner walls of these molds; And releasing the clamping state of the position fixing pins and releasing the clamping state of the molds.

On the other hand, the molding insert terminal according to the present invention,

In a terminal in the form of a conductive plate which is temporarily fixed to the inner wall of one of the molds constituting the jaw, and molded in a form embedded in the molten molding resin to be injected,

On one or both sides of the plate-shaped terminal body, one or more support protrusions protruding toward the inner wall of the molds forming the jaw and having a sharp tip are formed to form the terminal insert-shaped molding according to the first aspect of the present invention. It can be used in injection molding methods to replace the use of positioning pins.

Hereinafter, with reference to the accompanying drawings, the injection molding method of the terminal insert-molded molding according to the present invention and a terminal used in the method will be described in detail by way of examples.

Figure 2a and Figure 2b is a cross-sectional view illustrating a molding state through the injection molding method of the terminal insert molding according to the first aspect of the present invention, Figure 3 is an overall shape of the molding insert terminal according to an embodiment of the present invention 4 is a perspective cross-sectional view illustrating the overall structure of a molded article produced by the injection molding method according to the first aspect of the present invention.

Referring to these drawings, the injection molding method of the terminal insert molding according to the first aspect of the present invention will first be described. The injection molding method according to the present embodiment includes a first mold disposed to face each other as shown in FIG. The terminal 1 is temporarily fixed between the inner wall of the second mold 30 and the inner wall of the second mold 30, and the inner wall of the first mold 20 to which the terminal 1 is temporarily fixed and the inner wall of the second mold 30 are fixed. The molten molding resin 50 is injected into the spaced space S formed in the liver and solidified to obtain one molding 100, and then the molding 100 is detached from the molds 20 and 30 and discharged. This is very similar to the injection method of a terminal insert molding which is generally used in the related art.

However, in the injection molding method of the terminal insert-molded article according to the present embodiment, the terminal having a flat structure on both sides is not inserted and embedded as in the prior art, and is supported on one or both surfaces of the body 10 proposed in the present invention as described below. Using the terminal 10 formed so that the protrusion 11 protrudes, the support protrusion 11 which protrudes without a clamping action through a separate position fixing pin is formed on the inner wall of the first mold 20 and the second mold 30. By being supported by the inner wall, the fixed state of the terminal 1 is kept in the fixed position in the separation space S without physical deformation of the terminal 1 due to the high temperature and high pressure at the time of injection of the molding resin 50 is maintained. I am trying to.

Before describing the method in more detail, first, a description will be made of the terminal 1 on which the support protrusion 11 is formed, which is used in this method. As shown in the figure consists of a plate-shaped body 10 made of a conductive material such as metal.

Referring to the drawings, the molding insert terminal 1 according to the present embodiment, the body 10 is bent in a predetermined shape to correspond to the molding so that it can be inserted and embedded in the molten molding resin during the molding process, this bending The rear surface of the body 10 is formed to protrude conical support projections 11 having a pointed tip.

In this case, the support protrusion 11 formed on the terminal body 10 may be formed by press-fitting in a pressing process, or may be separately installed on the terminal body 10. In the terminal 1 shown in FIG. It shows what is formed through indentation in the process. In addition, although only the support protrusions 11 formed on the rear surface of the body 10 are shown in FIG. 3, the support protrusions 11 may be formed on either of the front and rear surfaces of the body 10, preferably both sides. Form on everything.

Referring to FIG. 2A again, the process of carrying out the injection molding method according to the first aspect of the present invention using the molding insertion terminal 1 will be described.

First, the terminal 10 having the conical support protrusions 11 formed on both surfaces of the body 10 is temporarily fixed to the inner wall of the first mold 20 or the inner wall of the second mold 30. In this embodiment, both ends of the terminal 1 are inserted into the installation groove 21 formed on the inner wall of the first mold, and the structure of the terminal 1 is temporarily fixed.

On the other hand, a seating hole 22 is provided between the installation grooves 21, and the terminal body 10 is placed in the seating opening 22 to maintain a more stable temporarily fixed state, but in the present embodiment, the seating The tip 22a of the sphere 22 is sharply processed so that the tip 22a of the seating port 22 and the terminal body 10 settled thereon are kept in line contact rather than surface contact.

Therefore, the molding 100 finally injection-molded in this way is not formed with a wide seating groove, as shown in FIG. 4, but has a relatively narrow width at the contact point with the terminal 1. The seating groove 110 is formed, so that the external exposed area of the terminal 1 can be minimized.

After the terminal 1 is installed on the inner wall of the first mold 10, the first mold 20 and the second mold 30 are clamped to each other. In this case, the inner wall and the first wall of the first mold 20 are clamped. The predetermined space | interval space S is secured between the inner walls of the 2 metal mold | die 20, and the terminal 1 is located in this space | interval space S. FIG.

At this time, the support protrusion 11 formed to protrude from the terminal body 10 is supported on the inner wall of the first mold 20 and the inner wall of the second mold 30, and thus the molding of the terminal insert molding according to the present embodiment. In the method, the terminal body 10 is supported / fixed at predetermined intervals between the inner wall of the first mold 20 and the inner wall of the second mold 30 without using a separate fixing pin, thereby molding the molding resin 50. It maintains its original state without displacement or deformation during the injection process.

Therefore, the molded article 100 formed through the injection molding method according to the present embodiment, unlike the conventional molded article, as shown in Figure 4 is not formed with a fixed hole according to the extraction of the fixing pin. However, depending on the molding conditions, the tip of the support protrusion 11 of the terminal may be slightly exposed, so the exposed portion is very small and does not matter much when considering the appearance or electrical stability aspects.

On the other hand, the support protrusion 11 has been described in the form of protruding to a height in contact with the inner wall of the mold (20, 30), in some cases, as shown in Figure 2b the front end of the support protrusion 11 It is also preferable to set the height of the support protrusions 11 so as to be spaced apart from the inner walls of the molds 20 and 30 with a gap having a width l of less than 1 mm, for example, not in contact with the inner wall of the mold.

In this case, the molten molding resin 50 is injected into the gap between the inner walls of the molds 20 and 30 and the supporting protrusions 11 of the terminal 1, and the supporting protrusions 11 are formed in the finished molding 100. It is completely embedded in the molding resin until the tip of the to prevent the phenomenon that the front end of the support projection 11 of the terminal is exposed to the outside. In addition, even if a small gap is provided between the inner walls of the molds 20 and 30 and the support protrusions 11, the inside of the mold 20 and 30 may be used to prevent physical deformation such as bending or displacement of the terminal 1 during the injection process. It does not interfere at all.

5A and 5B are cross-sectional views illustrating a molding state of a molding through an injection molding method of a terminal insert molding according to a second aspect of the present invention, and FIG. 6 is an injection molding of a terminal insert molding according to a second aspect of the present invention. A perspective cross-sectional view showing the overall shape of a molded article produced by the molding method, with reference to them below, an embodiment of the injection molding method of the terminal insert molding according to the second aspect of the present invention.

In the present invention, the injection molding method of the terminal insert molding according to the second aspect, unlike the injection molding method of the first aspect, as shown in Figure 5a, by using a conventional terminal (1 ') a plurality of position fixing pins ( Through 40), the terminal 1 'is clamped to achieve a stable fixed state.

Therefore, in the injection molding method of the terminal insert-molded article according to the present embodiment, as in the conventional method, the terminal 1 'is temporarily fixed to the inner wall of the first mold 20, and the temporarily fixed terminal 1' is fixed. After the pinch is securely clamped through a plurality of position fixing pins 40, the terminal 1 ′ is spaced between inner walls of the second mold 30 facing the inner wall of the first mold 20 to which the terminal 1 ′ is temporarily fixed. Injecting and solidifying the molten molding resin 50 into the space S to obtain one molding 100 ', then releasing the clamping state of the positioning pin 40 and clamping between the molds 20 and 30. It releases and the molding 100 'is removed from the metal mold | die 20 and 30, and it discharges.

However, in the injection method of the terminal insert-molded article according to the present embodiment, the terminal body 10 is sandwiched by adopting a conical positioning pin 40 having a sharp tip 40a without using a cylindrical positioning pin as in the prior art. By doing so, the contact between the terminal body 10 and the tip 40a of the conical position fixing pin 40 is such that the point contact state is not a surface contact state.

As described above, the injection molded product 100 ′ obtained by using the conical fixing pin 40 has a conical shape with a narrow core rather than a cylindrical shape as shown in FIG. 6. Thus, the molded article 100 'produced by the method of this embodiment significantly reduces the external exposure of the terminal 1'.

And as shown in Figure 5b, also in the injection molding method according to the present embodiment, a method for generating a gap of a predetermined interval between the tip 40a of the position fixing pin 40 and the terminal body 10 is adopted. can do. The space | interval 1 of this clearance gap is made into the range of about 1 mm or less similarly to 1st aspect.

When the injection by this method, the injection molding 100 'obtained because the molten molding resin 50 is filled into the gap formed between the tip 40a of the position fixing pin 40 and the terminal body 10, The fixing pin hole 120, which is a mark where the position fixing pin 40 is detached, is not formed through the terminal body 10, but is formed in a recessed shape in the molding resin portion, so that the terminal body 10 is not exposed to the molding resin. It is completely buried in.

As described above, the present invention proposes an injection molding method of a terminal insert molding and a molding insertion terminal used in the method. When the technical idea is adopted, the exposure of the terminal to the molding resin is minimized or prevented. Electrical instability due to corrosion of the terminal or the like can be prevented.

In particular, the injection molding method of the terminal and the terminal insert molding proposed in the present invention, by the action of the conventional positioning pins by the improved terminal shape, the convenience in the mold manufacturing and the cycle time in the injection molding process It is expected to shorten the time.

1 is a cross-sectional view showing a molding state during injection molding of a conventional terminal insert molding;

2A and 2B are cross-sectional views illustrating a molding state through the injection molding method of the terminal insert molding according to the first aspect of the present invention;

Figure 3 is a perspective view showing the overall shape of the molding insert terminal according to an embodiment of the present invention;

4 is a perspective cross-sectional view illustrating the overall structure of a molded article produced by the injection molding method according to the first aspect of the present invention;

5A and 5B are cross-sectional views illustrating a molding state through an injection molding method of a terminal insert molding according to a second aspect of the present invention;

6 is a perspective cross-sectional view illustrating the overall structure of a molded article produced by the injection molding method according to the second aspect of the present invention.

**** Explanation of symbols for the main parts of the drawing ****

1, 1 '. Terminal 10. Body

11. Supporting protrusion

20. Mold 1 21. Installation groove

22. Seating 22a. point

30. Second mold

40. Positioning pins 40a. point

50. Molding resin

100, 100 '. Form 110. Seating groove.

120. Pin Pin Hole S. Space

Claims (8)

In a method of injection molding a molded article inserted into the terminal, Temporarily fixing the terminal having one or more supporting protrusions protruding on one or both sides of the body to an inner wall of one of the molds forming the jaw; Clamping the molds to inject and solidify the molten molding resin into a space between the inner walls of the molds; The injection molding method of the terminal insert-molded product comprising the step of releasing the clamping state of the molds obtained by removing the obtained molding. 2. The method of injecting a molded article of a terminal insert according to claim 1, wherein a gap is formed between a tip of the support protrusion of the terminal and an inner wall of the mold with a width of less than 1 mm (except for 0). delete delete According to claim 1, wherein the inner wall of the mold to which the terminal is temporarily fixed is provided with a seating hole is placed in the body of the terminal, the seating hole is made in a pointed shape, the end is configured to make a line contact state with the terminal body placed Injection method of a terminal insert molding, characterized in that. In a terminal in the form of a conductive plate which is temporarily fixed to the inner wall of one of the molds constituting the jaw, and molded in a form embedded in the molten molding resin to be injected, On one side or both sides of the plate-shaped terminal body, the molding insert terminal, characterized in that one or more protrusions protruding toward the inner wall of the mold forming the jaw, the tip is pointed. 7. The molding insert terminal of claim 6, wherein the support protrusion is conical. 8. The molding insert terminal of claim 6 or 7, wherein the support protrusion is formed by press-fitting in a pressing process.