JP3872659B2 - Manufacturing method of electric circuit built-in case and manufacturing mold thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention, two or more fixed circuit board constituting an electric circuit, a method of manufacturing a case having a built integrally by insert molding, and is relates to the manufacturing mold.
[0002]
[Prior art]
For example, an actuator for locking or unlocking a door lock device of a vehicle by remote control is an electric circuit that serves as a fixed contact portion for detecting the rotation of the rotating member and the operation of the movable member in the case The fixed circuit board is insert-molded.
[0003]
As a manufacturing apparatus for a case incorporating the electric circuit, a pressing pin for positioning a fixed circuit board on the movable mold side is provided on the fixed mold in a mold constituted by a movable mold and a fixed mold. The pressing pin is disposed on the fixed mold so as to be movable up and down, and positions the fixed circuit board by the urging force of the urging member. Further, the pressing pin is provided with a step portion on the side of the end portion for positioning the fixed circuit board.
[0004]
When the molten resin is injected into the mold, the injection pressure of the resin is applied to the step portion, and the pressing pin is pushed up against the urging force of the urging member by the injection pressure.
[0005]
[Problems to be solved by the invention]
However, in the manufacture of the electric circuit built-in case, it is necessary to provide a pressing pin for each fixed circuit board constituting the electric circuit, and the pressing pin must be movably mounted on the fixed mold. There is a problem that it becomes complicated and expensive.
[0006]
Therefore, an object of the present invention is to simplify the structure of a mold and to manufacture a case in which an electric circuit is built by insert molding at a low cost.
[0007]
[Means for Solving the Problems]
In order to solve the above-described problems, in the method for manufacturing a case with a built-in electric circuit according to the present invention, two or more fixed circuit boards constituting an electric circuit integrally formed by a connecting portion are arranged in a mold composed of a movable mold and a fixed mold. And a movable pressing member having a first pressing pin that is pressed across the two or more fixed circuit boards, and a second pressing pin that has a through hole located on the connecting portion and positions the connecting portion. Then, the fixed circuit board is urged from the fixed mold side to the movable mold side and positioned, and the connecting part is sheared by a punch part of a shearing mechanism movably mounted through the through hole, and then the gold The molten resin is injected into the mold cavity, and the movable pressing member is resisted against the biasing force through the first pressing pin by the injection pressure of the molten resin flowing between the adjacent fixed circuit boards. Retreat to the fixed mold side By, the electrical circuit is to produce a casing with a built by insert molding.
[0008]
According to the manufacturing method, since the first pressing pins are positioned across two or more fixed circuit boards, the number of pressing pins can be reduced. As a result, since the number of pressing pins to be mounted on the fixed mold can be reduced, the configuration of the mold can be simplified and the cost can be reduced. Further, two or more fixed circuit boards are connected and integrally formed by a connecting portion, the connecting portion is positioned by a second pressing pin having a through hole, and the connecting portion is sheared by a shearing mechanism through the through hole. Therefore, workability when positioning the circuit board is improved. In addition, the number of pressing pins can be further reduced. In addition, no cut hole is formed when two or more fixed circuit boards are separated, and there is no need for secondary molding to close the hole. Furthermore, the separation process of each fixed circuit board can be performed in a unified manner with the manufacturing process of the case by injection. Therefore, the manufacturing cost can be greatly reduced. And since the case manufactured with this manufacturing method does not have the cut hole which cut | disconnected the connection part, it can prevent that water permeates into an inside.
[0009]
In the manufacturing method, it is preferable that an end portion of the first pressing pin that positions over the two or more fixed circuit boards is a flat pressing portion .
[0010]
Then, in the second pressing pin, positioning is performed across the fixed circuit board connected by the connecting portion by the flat pressing portion formed at the end portion on the movable mold side, and by injection of the molten resin into the cavity The movable pressing member is retracted to the fixed mold side against the urging force through the first and second pressing pins by the injection pressure of the molten resin flowing between the adjacent fixed circuit boards. Is preferred.
[0011]
In the present invention , the manufacturing mold of the electric circuit built-in case applied to the manufacturing method includes a movable mold and a fixed mold, and includes two or more fixed circuit boards constituting an electric circuit integrally formed by the connecting portion. In a mold for manufacturing a case built in by insert molding, the fixed mold is disposed so as to be movable toward the movable mold, and two or more fixed circuit boards are provided at the end of the movable mold. A first pressing pin that straddles and a second pressing pin that has a through hole located on the connecting portion and positions the connecting portion, and a receiving portion is provided on the other end side of these pressing pins . A movable pressing member , a shearing mechanism provided with a punch portion that shears the connecting portion through the through-hole, and one end arranged at a receiving portion of the movable pressing member , and the first and second pressing pins are movable. Attached to the mold side And a biasing member that allows contraction due to the injection pressure of the molten resin.
[0012]
In the manufacturing mold, it is preferable that the end of the first pressing pin on the movable mold side is a flat pressing portion .
[0013]
Further, it is preferable that a planar pressing portion is formed at an end of the second pressing pin on the movable mold side, and positioning is performed across the two or more fixed circuit boards connected by the coupling portion at the planar pressing portion. . If it does in this way, since each fixed circuit board can be positioned with the 2nd press pin for cut | disconnecting a connection part, the number of press pins can be reduced more.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show a case 1 manufactured by a manufacturing mold applied to the manufacturing method of the present invention. This case 1 is an upper case constituting an actuator housing for locking or unlocking a vehicle door lock device by remote control with a remote controller. In the case 1, an electric circuit serving as a fixed contact portion for detecting the rotation of a rotating member (not shown) disposed in the housing and the operation of the movable member is incorporated by insert molding.
[0015]
As shown in FIGS. 4A and 4B, the electric circuit includes three fixed circuit boards 5A, 5B, and 5C. The operating state of the rotating member or the movable member is detected by sliding the movable circuit substrate (not shown) across any two of the fixed circuit substrates 5A, 5B, and 5C.
[0016]
In the present embodiment, the fixed circuit boards 5A, 5B, and 5C are integrally formed as a single circuit board connected by the connecting portion 6. And when insert-molding with the manufacturing metal mold | die mentioned later, the said connection part 6 is cut | disconnected and a mutual conduction | electrical_connection is interrupted | blocked.
[0017]
Next, a manufacturing mold for manufacturing the case 1 will be described.
As shown in FIG. 5, this manufacturing mold includes a movable mold 11 arranged on the lower side and a fixed mold 13 arranged on the upper side, and these constitute a cavity 10 for injecting molten resin. is there.
[0018]
A punch receiving portion 12 is recessed in the movable die 11 at a position corresponding to the connecting portion 6 of the circuit board to be arranged on the cavity surface 11a.
[0019]
The fixed mold 13 is provided with a positioning shearing mechanism 15 that positions the circuit board on the cavity surface 11 a of the movable mold 11 and shears the connecting portion 6. The fixed mold 13 is provided with insertion holes 14a and 14b penetrating through the cavity surface 13a at predetermined positions corresponding to the integrally formed circuit board and at positions corresponding to the connecting portion 6.
[0020]
The positioning shearing mechanism 15 includes a movable pressing member 16, a fixed member 23, an urging member 26 disposed therebetween, and a punch actuating member 27.
[0021]
The movable presser member 16 has a first presser pin 17 that is movably inserted into the insertion hole 14a and a second movably inserted into the insertion hole 14b corresponding to the connecting portion 6 at one end of the base. A holding pin 19 is provided. The first pressing pin 17 presses the two fixed circuit boards 5A and 5B, the fixed circuit boards 5A and 5C, and the fixed circuit boards 5B and 5C constituting the electric circuit, and comes into contact with these surfaces. A first flat pressing portion 18 is provided. The second pressing pin 19 presses across the two fixed circuit boards 5A and 5B, the fixed circuit boards 5A and 5C, and the fixed circuit boards 5B and 5C including the connecting portion 6, and a punch actuating member to be described later 27, and includes a second flat pressing portion 20 that abuts against the surfaces of the fixed circuit boards 5A and 5B. The second pressing pin 19 is provided with a through hole 21 that guides the punch operating member 27 so as to be movable. A spring receiving portion 22 for positioning the biasing member 26 is provided on the other end side of the base of the movable pressing member 16.
[0022]
The fixing member 23 is installed in a state in which it cannot move with respect to the fixed mold 13. The fixing member 23 is provided with a through hole 24 corresponding to the through hole 21 of the movable pressing member 16 and a spring receiving portion 25 corresponding to the spring receiving portion 22.
[0023]
The urging member 26 is disposed between the spring receiving portion 22 and the spring receiving portion 25 and is formed of a spiral spring. The urging member 26 urges and positions the circuit board against the cavity surface 11a of the movable mold 11 via the movable pressing member 16, and the fixed circuit boards 5A and 5B, the fixed circuit boards 5A and 5C, And it is set as the urging | biasing force which accept | permits the shrinkage | contraction by the injection pressure of the molten resin which flows in between the fixed circuit boards 5B and 5C.
[0024]
The punch actuating member 27 constitutes a shearing mechanism that shears the connecting portion 6 of the circuit board integrally formed by an urging means and a pressing instrument (not shown) to bring the fixed circuit boards 5A, 5B, 5C into a non-communication state. To do. The punch actuating member 27 includes a base portion 28 that receives the operation of the pressing tool, and a punch portion 29 that is movably mounted in the through holes 21 and 24 is provided on the base portion 28. The punch portion 29 has a shear surface on one side thereof and a slight clearance from the shear surface on one side of the punch receiving portion 12 of the movable mold 11. The punch portion 29 is provided with a chamfered slope portion 30 at the corner on the other side and the shearing surface. The connecting portion 6 sheared by the slope portion 30 is bent, and the end portion of the punch portion 29 is punch receiving portion. 12 is configured to be immersed in the center position. In the present embodiment, the upper end edge of the inclined surface portion 30 coincides with the cavity surface 13 a of the fixed mold 13 with the punch operating member 27 retracted, and a protruding portion is formed on the surface of the molded case 1. And preventing the occurrence of burrs to a minimum.
[0025]
Next, a method for manufacturing the case 1 using the manufacturing mold will be described.
First, the fixed circuit boards 5 </ b> A, 5 </ b> B, 5 </ b> C integrally formed by the connecting portion 6 are set at predetermined positions on the cavity surface 11 a of the movable mold 11.
[0026]
Next, a known mold clamping operation for setting the movable mold 11 to the fixed mold 13 is performed. Accordingly, as shown in FIG. 6A, the first pressing pin 17 of the fixed mold 13 has the first flat pressing portion 18 of the fixed circuit boards 5A and 5B, or the fixed circuit boards 5A and 5C, or the fixed circuit. It is located across the two circuit boards of the boards 5B and 5C. Further, as shown in FIG. 6B, the second pressing pin 19 has a through hole 21 located on the connecting portion 6 and a second flat pressing portion 20 which is fixed circuit boards 5A and 5B or a fixed circuit. The board 5A, 5C or the fixed circuit boards 5B, 5C is located across the two circuit boards. As a result, the fixed circuit boards 5A, 5B, and 5C are urged toward the cavity surface 11a of the movable mold 11 by the urging member 26 that urges the movable pressing member 16, and are positioned in the set state.
[0027]
When the fixed circuit boards 5A, 5B, and 5C are set in the manufacturing mold, the connecting portion 6 is sheared by the punch actuating member 27 constituting the shearing mechanism as shown in FIG. Here, the shearing of the connecting portion 6 applies a load to the base portion 28 of the punch actuating member 27 with a pressing tool, so that the lower ends of all the punch portions 29 pass through the through holes 21 and 24 and the punch receiving portion 12 of the movable die 11. To advance simultaneously. As a result, all the connecting parts 6 are sheared simultaneously with the shearing surface of the punch receiving part 12, and the conduction of the fixed circuit boards 5A, 5B, 5C is interrupted. Further, as shown in the figure, the sheared connecting portion 6 is in a state where the shear end portion is bent and immersed in the punch receiving portion 12 of the movable die 11.
[0028]
When the connecting portion 6 is sheared, the punch actuating member 27 is moved upward as shown in FIG. In this state, the upper edge of the inclined surface portion 30 of the punch unit 29, coincides with the cavity surface 13a of the fixed mold 13.
[0029]
Thereafter, molten resin is injected into the cavity 10 from a gate (not shown). Then, as shown in FIGS. 9 (A) and 9 (B), the cavity 10 includes the first flat pressing portion 18 of the first pressing pin 17 and the cavity surface 11a of the movable mold 11 and the movable mold. The molten resin is filled between the second flat pressing portion 20 of the second pressing pin 19 including the inside of the 11 punch receiving portions 12 and the cavity surface 11 a of the movable die 11.
[0030]
Next, when the molten resin is further injected into the cavity 10, the flat pressing portions 18 and 20 are pressed upward by the injection pressure. As a result, as shown in FIGS. 10A and 10B, the movable pressing member 16 is pushed upward against the urging force of the urging member 26.
[0031]
When the resin filled in the cavity 10 is cured, the case 1 in which the electric circuit is built in the insert fan shape is formed.
[0032]
As described above, in the manufacturing method of the present invention, two or more fixed circuit boards 5A, 5B, and 5C are connected and integrally formed by the connecting portion 6, and the connecting portion 6 is sheared at the time of insert molding. The workability at the time of positioning is improved. Moreover, the separation process of each fixed circuit board 5A, 5B, 5C can be performed in a unified manner with the manufacturing process of the case 1 by injection. In addition, no cut hole is formed when two or more fixed circuit boards 5A, 5B, 5C are separated, and there is no need for secondary molding to close the holes. Therefore, the manufacturing cost can be greatly reduced.
[0033]
Furthermore, since one first pressing pin 17 positions over two or more fixed circuit boards 5A, 5B, 5C, the number of pressing pins can be reduced. Moreover, since the second pressing pin 19 constituting the shearing mechanism is positioned across the two fixed circuit boards 5A, 5B, 5C, the number of pressing pins can be further reduced. As a result, the number of pressing pins attached to the fixed mold 13 can be greatly reduced, so that the structure of the mold can be simplified and the cost can be reduced.
[0034]
On the other hand, as shown in FIGS. 1 to 3, the molded case 1 has, on its inner surface, a convex portion 2 that covers the sheared connecting portion 6 of the fixed circuit boards 5A, 5B, and 5C. 11 punch receiving portions 12. In addition, a hole 3 formed by the tip of the punch portion 29 of the punch operating member 27 constituting the shearing mechanism is formed on the outer surface corresponding to the convex portion 2. In FIG. 3, 1 a is a position where the first pressing pin 17 is positioned.
[0035]
And in the said case 1, since there is no cut hole for cut | disconnecting the connection part 6, it can prevent that water permeates into an inside. Further, since the sheared connecting portion 6 is located in the convex portion 2, it is possible to prevent malfunction due to the connecting portion 6 coming into contact with the separated fixed circuit boards 5A, 5B, and 5C. Furthermore, there is no risk of injury to the operator during assembly due to the exposed connecting portion 6.
[0036]
In addition, this invention is not limited to the structure of the said embodiment.
For example, in the above-described embodiment, two fixed circuit boards 5A and 5B or fixed circuit boards 5A and 5C or fixed circuit boards 5B and 5C are positioned by one first pressing pin 17; It is good also as a structure positioned across board | substrate 5A, 5B, 5C.
[0037]
【The invention's effect】
As is clear from the above description, in the manufacturing method of the electric circuit built-in case and the manufacturing mold thereof according to the present invention, the first pressing pin is pressed and positioned across two or more fixed circuit boards. The number of pins can be reduced. As a result, since the number of pressing pins to be mounted on the fixed mold can be reduced, the configuration of the mold can be simplified and the cost can be reduced.
[0038]
Further, since the circuit board is integrally formed by connecting two or more of the fixed circuit boards with a connecting portion, the positioning workability with respect to the mold is improved. Furthermore, no cut hole is formed when the fixed circuit board is separated, and there is no need for secondary molding to close the hole. Furthermore, the separation process of each fixed circuit board can be performed in an integrated manner with the manufacturing process of the case by injection. Therefore, the total cost can be greatly reduced. That is, an electric circuit built-in case can be provided at low cost.
[Brief description of the drawings]
FIG. 1A is a cross-sectional view showing an electric circuit built-in case molded by a manufacturing mold to which the manufacturing method of the present invention is applied, and FIG. 1B is an enlarged cross-sectional view of a main part of FIG.
FIG. 2 is a bottom view of FIG.
FIG. 3 is a plan view of FIG. 1;
4A and 4B show an integrally molded circuit board, in which FIG. 4A is a side view and FIG. 4B is a plan view.
FIG. 5 is a cross-sectional view showing a production mold of the present invention.
6A and 6B are cross-sectional views showing a first step of the manufacturing method of the present invention.
FIG. 7 is a cross-sectional view showing a second step of the manufacturing method of the present invention.
FIG. 8 is a cross-sectional view showing a third step of the manufacturing method of the present invention.
9A and 9B are cross-sectional views showing a fourth step of the production method of the present invention.
FIGS. 10A and 10B are sectional views showing a fifth step of the manufacturing method of the present invention. FIGS.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Case, 2 ... Convex part, 3 ... Hole , 5A, 5B, 5C ... Fixed circuit board, 6 ... Connection part, 10 ... Cavity, 11 ... Movable type | mold, 12 ... Punch receiving part, 13 ... Fixed type | mold, 14a, 14b ... insertion hole, 15 ... positioning shear mechanism, 16 ... movable pressing member, 17 ... first pressing pin, 18 ... first flat pressing portion, 19 ... second pressing pin, 20 ... second flat pressing portion, 21 ... Through hole, 22 ... spring receiving portion, 23 ... fixing member, 24 ... through hole, 25 ... spring receiving portion, 26 ... biasing member, 27 ... punch actuating member, 29 ... punch portion.

Claims (6)

Two or more fixed circuit boards constituting an electric circuit integrally formed by a connecting portion are arranged on a mold composed of a movable mold and a fixed mold ,
By a movable pressing member provided with a first pressing pin that is pressed across two or more fixed circuit boards and a second pressing pin that has a through hole located on the connecting portion and positions the connecting portion, The fixed circuit board is biased and positioned from the fixed mold side to the movable mold side,
After shearing the connecting portion with a punch portion of a shearing mechanism movably mounted through the through hole,
The molten resin is injected into the cavity of the mold, and the movable pressing member is resisted against the urging force via the first pressing pin by the injection pressure of the molten resin flowing between the adjacent fixed circuit boards. A method for manufacturing a case with a built-in electric circuit, characterized in that a case in which the electric circuit is built by insert molding is manufactured by retracting to the fixed mold side. 2. The method of manufacturing an electric circuit built-in case according to claim 1, wherein an end of the first pressing pin that is positioned across the two or more fixed circuit boards is a flat pressing portion . In the second pressing pin, positioning across the fixed circuit board connected by a connecting portion with a flat pressing portion formed at the end of the movable mold side,
Due to the injection of the molten resin into the cavity, the movable pressing member resists the urging force through the first and second pressing pins with the injection pressure of the molten resin flowing between the adjacent fixed circuit boards. The method for manufacturing a case with a built-in electric circuit according to claim 1, wherein the case is retracted to the fixed mold side . In a mold for manufacturing a case including a movable mold and a fixed mold, and including two or more fixed circuit boards constituting an electric circuit integrally formed by a connecting portion by insert molding,
In the fixed mold,
The movable presser is disposed so as to be movable toward the movable mold side, and is disposed on the end of the movable mold side so as to straddle the two or more fixed circuit boards and on the connecting portion. A second pressing pin that has a through hole and positions the connecting portion, and a movable pressing member that has a receiving portion on the other end side of these pressing pins ,
A shearing mechanism provided with a punch part for shearing the connecting part through the through hole;
An urging member disposed at one end of the receiving portion of the movable pressing member , urging the first and second pressing pins toward the movable mold, and allowing contraction due to an injection pressure of the molten resin ;
A mold for manufacturing a case with a built- in electric circuit , characterized by comprising: The manufacturing mold of the electric circuit built-in case according to claim 4, wherein an end of the first pressing pin on the movable mold side is a flat pressing part . A planar pressing portion is formed at the end of the second pressing pin on the movable mold side, and the two or more fixed circuit boards connected by the connecting portion are positioned across the planar pressing portion. 6. A mold for manufacturing an electric circuit built-in case according to claim 4 or 5, characterized in that:

Images