JPH09320731A - Manufacture of ic socket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide manufacture of an IC socket, preventing a blade in a cavity from being bent with a melting resin pressure, charged in the cavity during molding and capable of obtained a high quality IC socket. SOLUTION: One of a pair of molding dies 21 and 22 forming a cavity 23 at an abutting part is provided with arrayed plural blades 24 having a press fitting pore-forming protrusion part 26 for forming a press fitting pore for fitting a press-fitting part protruded from a base part of a contact pin. A press fitting pore-forming protrusion part of each blade is protruded in a cavity toward the other molding die, and the tip end part of the press fitting pore- forming protrusion part of the blade positioned on the most upstream side of the melting resin flow in at least the cavity during molding of a socket unit is fitted with a recess part, provided at the other molding die.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an IC socket, and more particularly to a method for molding a socket body holding a contact pin.

[0002]

2. Description of the Related Art IC sockets used for performance tests of IC packages are contacts for contacting terminals of an IC package (not shown) in a large number of press-fitting holes formed in a resin socket body and arranged at a narrow pitch. The press fit part of the pin is fitted.

An IC socket molding apparatus for injection molding the socket body of such an IC socket is shown in FIG.
As shown in (a) and (b), a fixed-side molding die (fixed die) 1 and a movable-side molding die (movable die) 2 form a cavity 3 which is a product shape portion. There is. The movable mold 2 has a press-fitting hole 4 into which the press-fitting part of the contact pin is fitted.
A plurality of blades 5 each having a press-fitting hole forming protrusion 6 for forming a groove are provided so as to protrude into the cavity 3. Then, conventionally, the tip of the press-fitting hole forming protrusion of the blade provided in the movable mold is brought into contact with the flat inner surface of the fixed mold to fill the cavity with the molten resin.

[0004]

In the above IC socket manufacturing method, the tip of the press-fitting hole forming projection 6 of each blade 5 is merely abutted against the flat surface of the fixed mold 1 during molding. , The blade 5 is in a cantilevered state in the cavity, and easily bends in the resin flow direction due to the pressure of the molten resin filled in the cavity 3. There are problems such as burrs, a thin portion for forming a contact pin press-fitting hole formed of resin between the blades 5 of the molding die, a mold release defect, and a breakage of the blade 5 during mold release. This is a cause of a decrease in the molding yield of the IC socket.

Therefore, it is an object of the present invention to provide an IC socket manufacturing method capable of providing a high quality IC socket by preventing the blade in the cavity from bending due to the molten resin pressure filled in the cavity during molding. It is in.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 provides a contact pin to either one of a pair of molding dies that cooperate to form a cavity. A plurality of blades having a press-fitting hole forming protrusion for forming a press-fitting hole for fitting a press-fitting portion protruding from the base part of the blade are formed, and the press-fitting hole forming protrusion of each blade is formed on the other side. In a method of manufacturing an IC socket in which a socket body having a press-fitting hole is injection-molded by a pair of molding dies by projecting into a cavity toward a mold, a molten resin flow in at least the cavity during molding of the socket body A method for manufacturing an IC socket, characterized in that the tip of the press-fitting hole forming protrusion of the blade located on the most upstream side is held by the other molding die.

According to the above-mentioned manufacturing method, at the time of molding of the socket body, of the plurality of blades provided in one of the molding dies, at least the press-fitting hole of the blade located on the most upstream side of the molten resin flow in the cavity is formed. Since the tip portion of the projecting portion is held by the other molding die, the supporting strength of the blade against the pressure of the molten resin injected into the cavity is increased. Therefore, the deformation of the blade during injection molding can be prevented, so that a high quality socket body can be provided and the life of the molding die can be extended.

The invention according to claim 2 is the I according to claim 1.
In the method for manufacturing a C socket, at the time of molding of the socket body, at least the recess of the other molding die is provided with the tip of the projection for forming the press-fitting hole of the blade located on the most upstream side of the molten resin flow in the cavity. It is characterized in that it is fitted inside.

In the above-mentioned manufacturing method, when the socket body is molded, the tip of the press-fitting hole forming protrusion of the blade provided in one of the molding dies is fitted into the recess provided in the other molding die. It is possible to provide a high-quality socket main body by making a slight modification to the molding die for the other or the other.

The invention according to claim 3 is the I according to claim 2.
In the method for manufacturing a C socket, the recess is a long groove whose both ends are open, and the tip ends of a plurality of the press-fitting hole forming protrusions arranged on the blade when the socket body is molded are fitted into the long groove. Is characterized by.

According to the above-mentioned manufacturing method, the tip ends of the plurality of press-fitting hole forming projections on the blade provided on one of the molding dies are fitted into the long grooves of the both ends open type provided on the other molding die. Therefore, the work is easier than individually fitting the plurality of press-fitting hole forming protrusions into the press-fitting holes. Further, since the concave portion provided in the molding die is a long groove whose both ends are open, processing of the molding die becomes easy.

The invention described in claim 4 is the first to third aspects of the present invention.
In the method for manufacturing an IC socket according to any one of the above items, at least a portion of the blade positioned on the most upstream side of the molten resin flow in the cavity when the socket body is molded is separated from the press-fitting hole forming protrusion by the other molding. It is characterized in that it is sandwiched by holding protrusions provided on the mold.

According to the above structure, at the time of molding of the socket body, at least a portion of the blade located on the most upstream side of the molten resin flow in the cavity separated from the press-fitting hole forming protrusion is provided in the other molding die. Since it is sandwiched by the protrusions for
The supporting strength of the blade is further enhanced, and the bending of the blade due to the molten resin pressure during injection molding can be prevented more effectively.

The invention according to claim 5 is the I according to claim 1.
In the method of manufacturing a C socket, a reinforcing protrusion is provided on the blade along with the press-fitting hole forming protrusion, and the tip of the reinforcing protrusion of the blade is used for forming the press-fitting hole when the socket body is molded. It is characterized in that it is fitted in a recess provided in the other molding die together with the tip of the protrusion.

According to the above construction, the tip end of the reinforcing protrusion provided side by side with the press-fitting hole forming protrusion on the blade provided in either one of the forming dies is made into the recess provided in the other forming die. Since they are fitted together, the supporting strength of the blade is further enhanced, and the bending of the blade due to the molten resin pressure during injection molding can be prevented more effectively.

The invention according to claim 6 is the I according to claim 5.
In the method for manufacturing a C socket, the recess is a long groove whose both ends are open, and the tip of the press-fitting hole forming protrusion and the tip of the reinforcing protrusion provided side by side on the blade during molding of the socket body are fitted into the long groove. It is characterized by combining.

According to the above-mentioned manufacturing method, the tips of the press-fitting hole forming projections and the reinforcing projections of the blade provided in one of the molding dies are fitted into the long grooves of the both-end open type provided in the other molding dies. Therefore, the work is easier than individually fitting the press-fitting hole forming protrusion and the reinforcing protrusion in the press-fitting holes. Further, since the concave portion provided in the molding die is a long groove whose both ends are open, processing of the molding die becomes easy.

The invention according to claim 7 is the I according to claim 6.
In the method for manufacturing a C socket, the tip portion of the press-fitting hole forming protrusion of the blade is brought into contact with the bottom surface of the long groove during molding of the socket body, and the tip portion of the reinforcing protrusion of the blade and the tip portion of the reinforcing protrusion are formed. It is characterized in that a gap is formed between the bottom surface of the long groove and the molten resin flows into the gap.

According to the above construction, the molten resin is caused to flow into the gap between the tip of the reinforcing protrusion of the blade provided on one molding die and the bottom surface of the long groove provided on the other molding die. The stupid hole formed by the reinforcing protrusion may be a bottomed hole that is not visible from the outside of the socket body.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2A and 2B are schematic views of a socket body molded by the method for manufacturing an IC socket according to the first embodiment of the present invention, and FIGS. Shows a method of manufacturing an IC socket according to the first embodiment of the present invention. Introduction Figure 1 and Figure 2
Referring to (a) and (b), a resin socket body 1
0 is a slit 11 that holds a large number of contact pins (not shown) that come into contact with the terminals of the IC package.
And two press-fitting holes 12 into which two press-fitting parts projecting downward from the base part of the contact pin are fitted, and the IC package includes four positioning pieces 13 projectingly formed on the socket body 10. The terminal portion is positioned and placed on the contact portion of the contact pin. One of the two press-fitting portions of the contact pin projects from the press-fitting hole 12 below the socket body 10 to form a terminal.

FIG. 3 is a schematic perspective view of a main part of a movable side molding die (movable die) 22 of a pair of molding dies for molding the socket body 10, and FIG. 4 is a fixed side molding. It is a principal part perspective view which turned the abutting surface of the metal mold | die (fixed metal mold | die) upward. 5 (a) and 5 (b) are sectional views of the fixed mold 21 and the movable mold 22 shown in FIGS.
This corresponds to the cross section of (b).

Referring to these figures, a cavity 23 for molding the socket body 10 is formed at the abutting portion of the pair of molding dies, that is, the fixed mold 21 and the movable mold 22, and one of the molding dies ( In this case, the movable mold 22 is provided with a slit forming portion 25 for forming a slit for holding the base portion of the contact pin and a press-fitting hole 12 for fitting a press-fitting portion protruding from the base portion of the contact pin. A plurality of blades 24 having two press-fitting hole forming protrusions 26 are arranged in an array.

The slit forming portion 25 and the press-fitting hole forming protrusion 26 of each blade 24 protrude toward the fixed mold 21 into the cavity 23. On the other hand, the fixed mold 21 is formed with a plurality of recesses that fit into the tips of the two press-fitting hole forming protrusions 26 of each blade 24. In this embodiment, each recess is composed of a long groove 27 which is formed between parallel ribs 28 and whose both ends are open, and the press-fitting hole forming projection 26 is formed when the fixed mold 21 and the movable mold 22 are butted. It is formed so as to contact the bottom of the long groove 27. As shown schematically in FIG. 3, the fixed mold 21 has a cavity 23.
A plurality of gates 29 for filling the molten resin therein are preferably provided.

According to the method of manufacturing an IC socket using the molding die having the above-described structure, when the fixed die 21 and the movable die 22 are butted against each other, each of the movable die 22 provided at the time of molding the socket body 10 is provided. Since the tips of the two press-fitting hole forming protrusions 26 of the blade 24 are fitted and held in the long grooves 27 of the fixed mold 21, the press-fitting hole forming protrusions 26 of the blades 24 are supported at both ends to form the cavity 23. It will come to you. Therefore, the supporting strength of the blade 24, particularly the press-fitting hole forming protrusion 26, is increased with respect to the molten resin pressure injected into the cavity 23 during molding, so that the deformation of the blade 24 during injection molding can be prevented.

In the above embodiment, the tips of the press-fitting hole forming protrusions 26 of all the blades 24 arranged are held by the same number of long grooves 27 formed in the fixed mold 21. One or a plurality of blades 24 located on the most upstream side of the flow of the molten resin in the cavity 23, for example, the press-fitting hole forming protrusion 26 of only one of the blades 24 at one end or both ends in the arrangement direction of the blades 24 is fixed. Even if it is held by the long groove 27 of the mold 21, the intended purpose of the present invention can be achieved. This is because the blade 24 held by the long groove 27 serves as a protective wall against the flow of the molten resin, so that the influence of the molten resin pressure on the press-fitting hole forming protrusion 26 of the blade 24 on the downstream side is reduced. .

In the above manufacturing method, when the socket body 10 is molded, the tip of the press-fitting hole forming protrusion 26 of the blade 24 provided in the movable mold 22 is fitted into the long groove 27 provided in the fixed mold 21. , Blade 24 and fixed mold 2
High-quality socket body 1 with slight changes to 1
0 can be provided.

The recess formed in the fixed mold 21 is, as shown in FIG. 6, the projection 2 for forming the press-fitting hole of the blade 24.
The distal end portion of 6 may be formed of a fitting hole 30 which is fitted individually, but when the long groove 27 is formed, a plurality of press-fitting hole forming protrusions 26 are fitted into the fitting hole 30 individually. Also makes the work easier. Further, if the concave portion provided in the fixed mold 21 is a long groove 27 of which both ends are open, the fixed mold 21 can be easily processed.

7 and 8 show a second embodiment of the present invention. In these figures, the same components as those in the first embodiment are denoted by the same reference numerals. In the second embodiment, the rib 28 that forms the long groove 27 is provided with the holding projection 31 that sandwiches the portion of the slit forming portion 25 of the blade 24 that is separated from the press-fitting hole forming projection 26. The other structure is the same as that of the first embodiment, and the tip of the press-fitting hole forming projection 26 of each blade 24 is fitted into the long groove 27 formed in the fixed mold 21 during molding. There is.

According to the above construction, when the socket body 10 is molded, a portion (here, a slit, here) separated from the press-fitting hole forming protrusion 26 of the blade 24 provided in one molding die (a movable die here) 22. Since the end portion of the forming portion 25 is sandwiched by the projecting portions 31 provided on the other molding die (fixed die in this case), the supporting strength of the blade 24 is further enhanced, and the bending of the blade due to the molten resin pressure during injection molding is increased. Can be prevented more effectively.

In the molding die used in the second embodiment, the slit forming portion 25 of only the blade 24 located on the most upstream side of the flow of the molten resin in the cavity 23.
Is sandwiched between the holding protrusions 31 of the fixed mold 21, but all the blades 2 provided in one molding mold
You may comprise so that the slit formation part 25 of No. 4 may be pinched | interposed by the protrusion part provided in the other molding die.

9 to 12 show a third embodiment of the present invention. In these figures, the same components as those in the first embodiment are denoted by the same reference numerals.

In the third embodiment, the blade 24 provided on one molding die (here, the movable die) 22.
Reinforcing protrusions 32 are provided on the slit forming portions 25 along with the press-fitting hole forming protrusions 26, and the other molding die (here, fixed die) 21 reinforces the blade 24 when the socket body 10 is molded. Slot 27 as a recess that fits with the tip of the projection 32 and the tip of the press-fitting hole forming projection 26.
Is provided. Note that, as shown in FIG. 13, the recess may be a fitting hole 33 that individually fits with the tip of the reinforcing protrusion 32 and the tip of the press-fitting hole forming protrusion 26.

According to the above construction, the press-fitting hole forming protrusion 2 is formed on the slit forming portion 25 of the blade 24 of the movable mold 22.
6, the tip of the reinforcing protrusion 32 provided side by side is fitted into the long groove (recess) 27 provided in the fixed mold 21, so that the supporting strength of the blade 24 is further increased and the blade is formed by the molten resin pressure during injection molding. The bending of 24 can be prevented more effectively.

Although all the blades 24 arranged in this third embodiment are provided with the reinforcing protrusions 32, only the blades 24 located on the most upstream side of the flow of the molten resin in the cavity 23 are provided. The reinforcing protrusion 32 may be provided on the slit forming portion 25 so as to be fitted into the recess 27 of the fixed mold 21.

In the third embodiment described above, FIG.
As can be seen from the above, since both the tip of the reinforcing protrusion 32 and the tip of the press-fitting hole forming protrusion 26 come into contact with the bottom of the long groove 27 during molding, the socket body that is a molded product. A burrow hole 14 is formed on the bottom surface of the socket body 10 by the reinforcing protrusion 32 of the blade 24.

Therefore, as shown in FIGS. 14 (a) and 14 (b), the reinforcing protrusion 3 of the blade 24 provided on the movable mold 22 when the fixed mold 21 and the movable mold 22 are butted against each other.
If a gap 33 is formed between the tip of the second mold 2 and the bottom of the long groove 27 provided in the fixed mold 21, and the molten resin is caused to flow into the gap 33 during molding, FIG.
As shown in FIG. 5, the burred hole 14 formed by the reinforcing protrusion 32 can be a bottomed hole that is not visible from the outside of the socket body 10.

The present invention has been described above based on the illustrated embodiments, but the present invention is not limited to the embodiments described above, and for example, the number of press-fitting hole forming protrusions provided on each blade 24 can be changed. It is possible to make changes and stagger the arrangement of the press-fitting hole forming protrusions along the arrangement direction of the blades 24. Further, the method of manufacturing an IC socket of the present invention can be similarly applied to a socket body for inspecting an IC package in which terminals are arranged on three sides or four sides.

[0039]

As is clear from the above description, according to the method of manufacturing an IC socket of the present invention, the blade in the cavity is prevented from bending due to the pressure of the molten resin filled in the cavity during molding, and the regulation is performed. It is possible to provide a high-quality IC socket having the contact pin press-fitting hole.
In addition, the life of the molding die and the yield of the socket body, which is a molded product, are improved.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a socket body molded by a method for manufacturing an IC socket according to a first embodiment of the present invention.

2A and 2B are a sectional view taken along line AA and a sectional view taken along line BB in FIG. 1 of the socket body shown in FIG. 1, respectively.

FIG. 3 is a schematic perspective view of a main part of a movable mold of the molding dies used in the method for manufacturing an IC socket according to the first embodiment of the present invention.

FIG. 4 is a perspective view of a main part with a butting surface of a fixed mold of the molding mold facing upward.

5 (a) and 5 (b) are cross-sectional views of the fixed mold and the movable mold shown in FIGS. 3 and 4 butted against each other. It corresponds.

FIG. 6 is a schematic perspective view of a main part of a fixed mold showing a modified example of the form of a recess formed in the fixed mold of the first embodiment.

FIG. 7 is a schematic perspective view of a main part of a fixed mold of the molding dies used in the method for manufacturing an IC socket according to the second embodiment of the present invention.

FIG. 8 is a schematic perspective view of a main part of a movable mold of a molding mold used in the method for manufacturing an IC socket according to the second embodiment of the present invention.

FIG. 9 is a schematic perspective view of a main part of a movable mold of a molding mold used in the method for manufacturing an IC socket according to the third embodiment of the present invention.

FIG. 10 is a schematic perspective view of a fixed mold of a molding mold used in the method for manufacturing an IC socket according to the third embodiment of the present invention.

11 (a) and 11 (b) are views showing a state where a fixed mold and a movable mold of the third embodiment are butted against each other, respectively.
It is a sectional view similar to (b).

12 (a) and 12 (b) are views of a socket body molded by the manufacturing method of the third embodiment, respectively.
It is a sectional view similar to FIG.

FIG. 13 is a main part schematic perspective view showing a modified example of the form of the concave portion of the fixed mold in the third embodiment.

14 (a) and 14 (b) are main-part cross-sectional views showing a fourth embodiment of the present invention in which the reinforcing protrusion in the third embodiment is modified.

FIG. 15 is a sectional view similar to FIG. 2 (a) of the socket body made by the manufacturing method of the fourth embodiment.

FIG. 16 is a sectional view of an essential part of a socket body molding die showing a conventional example of a method for manufacturing an IC socket.

[Explanation of symbols]

 10 Socket body 11 Slit 12 Press-fit hole 21 Fixed mold 22 Movable mold 23 Cavity 24 Blade 25 Slit forming part 26 Press-fitting hole forming protrusion 27 Long groove (recess) 28 Rib 29 Nozzle 30 Fitting hole 31 Holding protrusion 32 Reinforcing protrusion 33 Fitting hole (recess)

Claims (7)

[Claims] 1. A press-fitting hole for forming a press-fitting hole into which a press-fitting part projecting from a base part of a contact pin is fitted, in one of a pair of molding dies that cooperate with each other to form a cavity. A plurality of blades having hole forming protrusions are arranged in an array, and the press-fitting hole forming protrusions of the respective blades are made to protrude into the cavity toward the other molding die and the press-fitting is performed by the pair of molding die. In a method of manufacturing an IC socket in which a socket main body having a hole is injection-molded, at the time of molding of the socket main body, at least the tip of the press-fitting hole forming protrusion of the blade positioned on the most upstream side of the molten resin flow in the cavity is set to A method for manufacturing an IC socket, characterized in that the IC socket is held by the other molding die. 2. When molding the socket body, at least the tip of the press-fitting hole forming protrusion of the blade located on the most upstream side of the molten resin flow in the cavity is placed in the recess provided in the other molding die. The method of manufacturing an IC socket according to claim 1, wherein the IC socket is fitted. 3. The recess is a long groove whose both ends are open, and the tip ends of a plurality of the press-fitting hole forming protrusions arranged on the blade when the socket body is molded are fitted into the long groove. The method for manufacturing an IC socket according to claim 2. 4. A holding projection provided on the other molding die at a position spaced from a press-fitting hole forming projection of a blade located at the most upstream side of the molten resin flow in the cavity at the time of molding the socket body. The method for manufacturing an IC socket according to claim 1, 2 or 3, wherein the IC socket is sandwiched between parts. 5. A reinforcing protrusion is provided on the blade in parallel with the press-fitting hole forming protrusion, and a tip of the reinforcing protrusion of the blade is formed at the time of molding of the socket body. 2. The method of manufacturing an IC socket according to claim 1, wherein the IC socket is fitted in a recess provided in the other molding die together with the tip of the IC socket. 6. The recess is a long groove whose both ends are open, and the press-fitting hole forming projection and the tip of the reinforcing projection provided side by side on the blade when the socket body is molded are fitted into the long groove. I according to claim 5, characterized in that
C socket manufacturing method. 7. The tip of the press-fitting hole forming protrusion of the blade is brought into contact with the bottom surface of the elongated groove when the socket body is molded, and the tip of the reinforcing protrusion of the blade and the elongated groove are formed. 7. The method for manufacturing an IC socket according to claim 6, wherein a gap is formed between the bottom surface and the molten resin, and the molten resin is allowed to flow into the gap.