JP2000127198A - Insert molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insert molding method not generating the trace of fixing insert parts on an insert position on an insert molded product. SOLUTION: First and second insert parts A and B are stored respectively in a cavity between a first mold block 8 and a second mold block 9 constituting a resin molding die, and the resin is injected from a gate 6. The resin from the gate 6 is passed through a through-hole 10 formed on a second insert part and injected into the cavity, and the first insert part A is pressed on the first mold block 8 by the injection pressure, while the second insert part B is pressed on the mold block 9 by the reaction pressure to fill the resin in the cavity, and insert molding can be carried out without using a means for fixing the insert parts A and B respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert molding method for molding a resin in such a manner that an insert part is provided at a predetermined position on a resin molded product.

[0002]

2. Description of the Related Art As shown in a sectional view of FIG.
A conventional insert molding method for resin-molding an insert molded product 50 in which a second insert component 52 and a second insert component 52 are provided includes:
This is performed by a mold configuration as shown in a sectional view in FIG.

[0003] In FIG. 13, a first mold block 54 constituting a resin molding mold has component fixing pins 54a and 54a.
b, the second mold block 55 has a component fixing pin 55a,
55b and 55c are provided respectively. Also, the first
A through hole 56 for passing the component fixing pin 55b is provided in the insert component 51a of the second insert component 5a.
2a is formed with through holes 57a and 57b for passing the component fixing pins 54a and 54b. The first and second insert parts 51a, 52a are accommodated in a cavity formed between the first mold block 54 and the second mold block 55, and the first mold block 54 and the second When the space between the second mold block 55 and the second mold block 55 is closed, as shown in FIG. 14, the component fixing pins 54a and 54b provided in the first mold block 54 are inserted into the through holes 57a and 57b of the second insert component 52a. , The first component 51a is pressed against the inner surface of the second mold block 55, and the component fixing pins 55a, 55b,
Reference numeral 55c denotes a state where the second insert part 52a is pressed against the inner surface of the first mold block 54. An insert-molded product 50a in which a resin is injected from a gate (not shown) into a cavity 59 which is formed between the first mold block 54 and the second mold block 55 and is a resin filling space to form a resin molded portion 53a. Are formed in a state as shown in a sectional view in FIG.

[0004]

However, in the conventional insert molding method, the intended insert molded product 50 shown in FIG. 12 (a) is fixed to a part like the insert molded product 50a shown in FIG. 12 (b). Pins 54a, 54
b, 55a, 55b, and 55c exist in the pin holes 5
8a-58e will be formed in the state where it remained.

[0005] When the insert molded product 50a is used as an exterior surface of the product, the pin holes 58a to 58e need to be post-processed by filling the holes and polishing the surface because unnecessary openings impair the appearance. Becomes Also, the pin holes 58a to 58
Since e is a hole extending from the surface of the insert molded product 50a to each of the insert components 51a and 52a, when the insert components 51a and 52a are metal members, rust or corrosion may occur due to intrusion of moisture or gas. There is. In addition, when the adhesiveness between the insert components 51a and 52a and the resin is low, there is a possibility that adverse effects such as moisture entering through the interface may occur.

An object of the present invention is to provide an insert molding method for inserting an insert part into a predetermined position without leaving a trace for fixing the position of the insert part at the predetermined insert position.

[0007]

According to a first aspect of the present invention, there is provided an insert molding method, comprising: disposing at least one insert part in a cavity of a resin molding die; The insert molding is performed by positioning the insert component at a predetermined position in the cavity by the injection pressure of the resin injected into the cavity.

According to this insert molding method, since the insert component is pressed to a predetermined position by the injection pressure of the resin injected into the cavity and the resin is filled, the insert component is molded in a state fixed at the predetermined position. ,
A fixing pin for fixing the insert part at a predetermined position is unnecessary, and insert molding without leaving a trace of the fixing pin can be performed.

In the above insert molding method, resin is injected from a gate provided on a side facing a position where an insert part is to be inserted, and the resin is pressed into a position where the insert part is to be inserted by the injection pressure of the resin to perform insert molding. Because the injection pressure of the resin injected from the gate presses the insert part on the opposite side of the gate to a predetermined position and the resin is filled in the cavity,
Insert molding can be performed without providing fixing means such as fixing pins.

In addition, a through hole corresponding to the gate position is formed in an insert part to be inserted on the side where the gate is provided, and the resin injected from the gate passes through the through hole and reflects the pressure reflected by the facing surface of the gate. By pressing the insert component against the wall surface to perform insert molding, the insert component is inserted on the gate side by the pressure of the resin reflected on the facing surface of the gate. When another insert part is arranged on the opposite side of the gate, this insert part is pressed and fixed at a predetermined position by the injection pressure of the resin, and the insert part arranged on the gate side is pressed and fixed by the reflected resin, so it is fixed. Without providing fixing means such as pins
Two insert parts can be inserted into the resin.

In the insert molding method according to the second invention of the present application, at least one insert part is disposed in a cavity of a resin molding die, and a positioning projection formed on the insert part is brought into contact with a predetermined portion. The insert molding is performed by positioning the insert component at a predetermined position in the cavity.

According to this insert molding method, the position of the insert is determined by contacting the convex portion formed on the insert part with the predetermined portion, and the predetermined portion is simultaneously inserted even if the predetermined portion is a wall surface in the cavity. Another insert part may be used, and the insert part is positioned at a predetermined position by closing a mold containing the insert part.

[0013] The insert molding method according to the third invention of the present application may be arranged such that at least one insert is formed in the cavity of the resin molding die.
A plurality of insert parts are arranged, and the insert part is positioned at a predetermined position in the cavity by advancing drive of a part fixing pin provided so as to be able to advance and retreat in the cavity, and progress of resin filling into the cavity. The component fixing pin is driven backward and insert molding is performed.

According to this insert molding method, the component fixing pin for positioning and fixing the insert component at a predetermined position in the cavity is retracted from the cavity in accordance with the progress of the filling of the resin into the cavity. No mark remains on the insert molded product, and insert molding can be performed without performing post-processing to fill the pin mark.

[0015] The insert molding method according to the fourth invention of the present application may be arranged such that at least one insert is formed in the cavity of the resin molding die.
A plurality of insert parts are arranged, and the insert part is positioned at a predetermined position in the cavity by means of a part fixing pin urged and attached to the mold so as to protrude into the cavity. It is characterized in that the component fixing pin is pushed out of the cavity against the bias by the lift applied by the flow of the resin to the lift generating section formed at a predetermined angle with respect to the flow direction from the cavity to perform insert molding.

According to this insert molding method, when the insert component is accommodated in the cavity and the mold is closed, the insert component is positioned and fixed by the component fixing pin. When the resin was injected into the cavity, the flow caused a force to push the lift generating portion of the component fixing pin out of the cavity against the bias, thereby increasing the filling amount of the resin and increasing the flow pressure. At this time, the component fixing pin is pushed out of the cavity, and the insert component is insert-molded without leaving a trace of the component fixing pin in a state where the insert component is covered with the filled resin and inserted at the positioned position.

Further, according to the fifth aspect of the present invention, there is provided the insert molding method, wherein at least one insert molding method is provided in the cavity of the resin molding die.
The insert part is disposed at a predetermined position in the cavity by driving a part fixing pin also serving as a gate opening / closing valve provided so as to be able to move forward and backward into the cavity at the gate position of the mold. In addition, the gate is opened, the resin is injected into the cavity, and the component fixing pin is driven backward in accordance with the progress of the filling of the resin into the cavity, the gate is closed, and insert molding is performed. .

According to this insert molding method, the component fixing pin also serving as the gate opening / closing valve is driven to advance into the cavity, whereby the insert component is positioned and fixed by the component fixing pin, and at the same time, the resin enters the cavity from the gate. Be injected. When the filling of the resin reaches a predetermined amount, when the component fixing pin is driven backward, the insert part is inserted in a state where the position is fixed with the filled resin, and the component fixing pin is completed with the resin filling in the cavity. By closing the gate, insert molding is performed without leaving traces of component fixing pins.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention.
The embodiment described below is an example embodying the present invention, and does not limit the technical scope of the present invention.

Each embodiment described below relates to an insert molding method in which one or two insert parts are inserted into a resin so that each insert part is disposed at a predetermined position on both sides of a resin molded product. It is shown.

(First Embodiment) As shown in FIG. 1, a first insert part A is provided between a first mold block 8 and a second mold block 9 constituting a resin molding mold. And the second
And the first mold block 8 and the second mold block 9 are closed, and resin is injected from the gate 6 provided in the second mold block 9 to form a cavity. 37 is filled with resin to form an insert molded product 1 as shown in FIG.

A through hole 10 is formed in the second insert part B at a position corresponding to the gate 6, and positioning recesses 12, 12 are formed in the positioning projection 11 formed in the second mold block 9. , 11 are positioned at a predetermined position on the second mold block 9 and the through hole 10 is arranged so as to coincide with the gate 6. The first insert part A is disposed on the second insert part B so that the first insert part A
When the resin is injected from the gate 6 by closing the space between the mold block 8 and the second mold block 9, the injection pressure of the resin injected from the gate 6 through the through hole 10 causes the injection pressure of FIG.
As shown in (1), the first insert part A is pressed against the inner wall of the cavity of the first mold block 8, and the resin reflected by the first insert part A becomes the second insert part B.
Is pressed against the cavity inner wall of the second mold block 9,
The space in which the first insert part A is extruded by the injected resin is filled, and the resin molded part 7 shown in FIG. 2 is molded.

According to this insert molding method, first,
Since each of the second insert parts A and B is pressed and fixed to a predetermined position by the injection pressure of the resin, insert molding can be performed without providing a means such as a fixing pin for fixing the position, and the fixing pin can be used. Since no opening or the like is formed, the finishing after the resin molding can be simplified.

The first insert part A or the second insert part A
Of the first insert part A can be inserted into the respective predetermined positions. In the case of the first insert part A, the position is fixed by the injection pressure of the resin injected from the gate 6, and the second insert part In the case of B, the position of the injected resin is fixed by the pressure reflected on the facing surface of the cavity, and insert molding is performed by the resin filled in the cavity 37.

(Second Embodiment) In this configuration, one of the first insert part C and the second insert part D is provided with a projection for regulating a distance from the other, and each of the insert parts C and D is provided. In the present embodiment, the projections 15 are formed on the second insert part D. As shown in FIG. 3, a first mold block 13 and a second mold block 14 constituting a resin molding mold
The first insert component C and the second insert component D are arranged between the first mold block 13 and the second mold block 14 to close the first mold block 13 and the second mold block 14. This first mold block 13
The height dimension of the first insert component C placed on the projection 15 formed on the second insert component D at the height of the cavity 38 formed between the first insert component C and the second mold block 14. Are set so as to coincide with each other, so that when the space between the first mold block 13 and the second mold block 14 is closed, the first insert component C is connected to the first mold block as shown in the drawing. 13 and the second insert part D is disposed so as to be in close contact with the inner wall of the second mold block 14. Also, since the first insert component C mounted on the projection 15 has recesses 16, 16 at positions corresponding to the projections 15, the tips of the projections fit into the recesses 16. The first insert component C is positioned in the illustrated left-right direction.

In the state shown in FIG. 3, resin is injected into the cavity 38 from a gate (not shown) to
As shown in FIG. 4, an insert-molded product 2 in which the space between the first and second insert parts C and D arranged vertically is filled by the resin molding part 17 by filling the inside with resin.
Is formed. According to this insert molding method, since the positioning of the first and second insert parts C and D is set by the projection 15, no molding trace due to the fixing pin or the like is formed on the surface. Finishing processing can be omitted.

(Third Embodiment) As shown in FIG. 5, a first mold block 18 constituting a resin mold is
The fixing jig 20 provided with the component fixing pins 21 is disposed so as to be able to advance and retract into the cavity 39,
Similarly, a fixing jig 22 provided with two component fixing pins 23 is disposed on the second mold block 19 so as to be able to advance and retract into the cavity 39. Further, the first insert component E corresponds to the component fixing pin 21 and the second insert component corresponds to the through hole 24 and the component fixing pin 23.
In the insert part F, through holes 25, 25 are formed.

As shown in FIG. 5, each fixing jig 20, 22
With the component fixing pins 21 and 23 advanced into the mold, the first and second insert components E and F are accommodated in the mold, and the first mold block 18 and the When the space between the second mold block 19 and the second mold block 19 is closed, the component fixing pin 21 of the fixing jig 20 provided on the first mold block 18 passes through the through hole 24 of the first insert component E and the second mold block 18 has Is pressed against the inner wall of the second mold 19.
Further, the fixing jig 2 provided on the second mold block 19
The second component fixing pin 23 penetrates the through hole 25 of the second insert component F and presses the first insert component E against the inner wall of the first mold block 18. The resin is injected into the cavity 39 from a gate (not shown) from the state shown in FIG.
When the insert parts E and F are held in position, the fixing jigs 20 and 22 are retracted out of the mold as shown in FIG. Since the traces of the component fixing pins 21 and 23 and the through holes 24 and 25 drawn out from the mold by the retreat of the fixing jigs 20 and 22 are quickly filled with resin, the inside of the cavity 39 is filled with resin. The resin molding portion 26 is formed by filling.

FIG. 7 shows a cross section of the insert molded product 3 insert-molded by the above-mentioned insert molding method. The through holes 24 and 25 formed in the first and second insert parts E and F, respectively. Are filled with resin, so that the component fixing pins 2
It is formed in a state where there is no opening due to 1, 23.

(Fourth Embodiment) As shown in FIG. 8, a component fixing pin 30 urged inwardly of a cavity 40 by a spring 39 is provided in a first mold block 27 constituting a resin molding mold. A first mold block 27 and a second mold block 27
When the gap between the mold block 28 and the component fixing pin 3 is
0 means that the insert part G is in the second mold block 28
Is pressed against the inner wall of the cavity.

Since the tip of the component fixing pin 30 is formed with a lift generating portion 30a inclined at an angle from the biasing direction, when the resin is injected into the cavity 40 from this state, the resin hitting the lift generating portion 30a The lifting pressure is applied to the component fixing pin 30 by the fluid pressure of the
9 when a lift greater than the urging force of 9 is applied.
0 is extruded from the cavity 40, and the resin is filled in the cavity.

As shown in FIG. 9, in the insert molded product 4 molded by this insert molding method, the trace of the tip of the component fixing pin 30 remains in the resin molded portion 31 as the concave portion 32, but the insert component G is positioned. An opening or the like for fixing is not formed, but is formed in a state where flatness is maintained.

(Fifth Embodiment) As shown in FIG.
The first mold block 33 constituting the resin molding mold includes:
A component fixing pin 35 also serving as an open / close valve of the gate 32 is mounted in the cavity 41 so as to be able to move forward and backward. As shown in FIG. 10A, the insert part H is accommodated in the cavity 41 to close the space between the first mold block 33 and the second mold block 34, and as shown in FIG. 10B. When the component fixing pin 35 is advanced and driven, the gate 32 is opened and the resin is injected into the cavity 41, and the component fixing pin 35 presses the insert component H against the inner wall of the cavity of the second mold block 34 and fixes it. I do.
When the filling of the resin into the cavity 41 reaches a predetermined amount, when the component fixing pin 35 is driven backward, the position of the insert component H is fixed by the filling pressure of the resin, so that the resin filling into the cavity 41 is performed. When the operation is completed, the gate 32 is closed by the backward drive of the component fixing pin 35.

As shown in FIG. 11, the insert molded product 5 molded by this insert molding method is in a state where the insert component H is inserted into one surface of the resin molded portion 36, and the position of the insert component H is fixed. Are not formed, but are formed in a state where the flatness is maintained.

[0035]

As described above, according to the present invention, the trace of the fixing means for fixing the insert part at the insert position does not remain as an opening on the surface of the molded product, so that the moisture or gas from the opening can be prevented. There is no adverse effect due to intrusion of
In addition, no trace processing for filling the opening is required.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an insert molding method according to a first embodiment.

FIG. 2 is a cross-sectional view of an insert molded product formed according to the first embodiment.

FIG. 3 is a sectional view showing an insert molding method according to a second embodiment.

FIG. 4 is a cross-sectional view of an insert molded product formed according to the second embodiment.

FIG. 5 is a sectional view showing an insert molding method according to a third embodiment.

FIG. 6 is a sectional view showing an insert molding method according to a third embodiment.

FIG. 7 is a sectional view of an insert molded product molded according to the third embodiment.

FIG. 8 is a sectional view showing an insert molding method according to a fourth embodiment.

FIG. 9 is a cross-sectional view of an insert molded product formed according to a fourth embodiment.

FIGS. 10A and 10B are cross-sectional views of the insert molding method according to the fifth embodiment, wherein FIG. 10A shows a mold closed state, and FIG.

FIG. 11 is a cross-sectional view of an insert molded product formed according to the fifth embodiment.

FIG. 12 is a cross-sectional view showing an insert molded product (b) formed by a conventional molding method on a target insert molded product (a).

FIG. 13 is a cross-sectional view showing a conventional insert molding method (when the mold is opened).

FIG. 14 is a sectional view showing a conventional insert molding method (when the mold is closed).

[Explanation of symbols]

 1-5 Insert molded product 8, 13, 18, 27, 33 First mold block 9, 14, 19, 28, 34 Second mold block 15 Projection 21, 23, 30, 35 Component fixing pin 37- 41 cavities A to H insert parts

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuichi Nakajima 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 4F202 CA11 CB01 CB12 CB20 CQ00 CQ01 CQ05 CQ07 4F206 JA07 JB12 JB20 JL02 JM04 JQ81

Claims (7)

[Claims] At least one insert part is disposed in a cavity of a resin molding die, and the insert part is positioned at a predetermined position in the cavity by an injection pressure of a resin injected into the cavity to perform insert molding. An insert molding method, characterized in that: 2. The insert molding according to claim 1, wherein the resin is injected from a gate provided on the side facing the position where the insert component is to be inserted, and the insert component is pressed to the position where the insert component is to be inserted by the injection pressure of the resin to perform insert molding. Method. 3. A through-hole corresponding to the position of the gate is formed in an insert part to be inserted on the side where the gate is provided, and the pressure of the resin injected from the gate passing through the through-hole and reflected by the facing surface of the gate. 3. The insert molding method according to claim 1, wherein the insert part is pressed against the insert position to perform insert molding. 4. At least one insert part is provided in a cavity of a resin molding die, and a positioning projection formed on the insert part is brought into contact with a predetermined portion, so that the insert part is located in the cavity. An insert molding method characterized by performing insert molding by positioning at a predetermined position. 5. At least one insert part is provided in a cavity of a resin molding die, and the insert part is moved into and out of the cavity by an advance driving of a part fixing pin provided so as to be able to advance and retreat in the cavity. And performing insert molding by driving the component fixing pin backward in accordance with the progress of resin filling into the cavity. 6. At least one insert part is provided in a cavity of a resin molding die, and said insert part is caved by a part fixing pin attached to the die so as to protrude into the cavity. The component fixing pin is positioned at a predetermined position, and the component fixing pin is provided with a predetermined angle with respect to the flow direction of the resin. An insert molding method characterized by being extruded from inside and insert-molded. 7. A component fixing pin serving as a gate opening / closing valve provided at least one insert part in a cavity of a resin molding die and provided at a gate position of the die so as to be able to advance and retreat into the cavity. The insert part is positioned at a predetermined position in the cavity by driving the nozzle into the cavity, and the gate is opened to inject the resin into the cavity, and the part fixing pin is retracted in accordance with the progress of the resin filling into the cavity. An insert molding method characterized in that the gate is driven to close and the insert molding is performed.