JP2001096569A - Wire-insert injection-molding method and mold for injection molding used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a wire-insert injection molding method by which a product free from wire deformation and wire positional deviation from an axial center can be molded with high precision, when a molding having a fine wire embedded in the axial direction of the molding is obtained by injection molding as well as a mold for injection molding used in the method. SOLUTION: A fine straight wire D protected by a sleeve 12 is set in a cavity 5 space to be formed by clamping a fixed half 3 and a movable half 4 of a mold for injection molding, and a molding A is injection-molded with the wire D inserted by filling the cavity 5 with resin. In this case, only the sleeve 12 is moved backward from the interior of the cavity 5, synchronized with a resin filling action to leave the wire D as it is in the resin and thus the wire D is inserted without fear about the deformation of the wire D by resin pressure or the deterioration of its coaxiality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert injection molding method for integrally molding a single wire or a plurality of wires or stranded wires having a fine diameter, for example, while maintaining linearity inside a molded product. The present invention relates to an injection molding die to be used.

[0002]

2. Description of the Related Art In order to obtain a molded product in which a linear wire having a fine diameter is axially inserted at the center of the axis of a cylindrical resin molded product molded using an injection molding die. In the cavity space formed by closing the movable mold and the fixed mold of the mold, both ends of the wire are fixed and set in advance, and when the cavity is filled with the resin, the wire is inserted into the resin of the molded product. 2. Description of the Related Art Insert injection molding of a wire to be inserted is known.

[0003]

However, when the diameter is 0.3
When insert molding a fine wire material such as mm into the resin, the wire material is deformed by the molten resin pressure that has flowed into the cavity, or is displaced from the center of the shaft to achieve the desired accuracy. May not be obtained. For this reason, in products requiring high precision, a wire having a thickness not affected by the flowing molten resin is first insert-molded, and then the wire is pulled out, and a fine wire is drawn on this mark. A method of inserting and embedding with an adhesive is generally adopted. However, according to this method,
Deformation of the wire can be prevented, but positioning is difficult, and secondary processing is required, so that it is difficult to shorten the working time and improve accuracy, and the cost is further increased.

[0004] An object of the present invention is to obtain a molded product in which a fine wire is inserted in the axial direction of the molded product by an injection molding method.
An object of the present invention is to provide a method for insert injection molding of a wire, in which the wire is not deformed or displaced from an axis center, and an injection molding die used for the method.

[0005]

According to a first aspect of the present invention, there is provided a method for insert injection molding of a wire rod. A sleeve is placed over the wire having one end fixed to the mold side and positioned in the cavity,
b. Filling the resin from the fixed side of the wire into the cavity in which the wire and the sleeve are located as described above, and only the sleeve is retracted by the flow pressure of the filled resin so that the wire remains in the resin. C . After the mold is cooled and the resin in the cavity is cured, the mold is opened and the molded product containing the wire is taken out.

Further, in the invention according to claim 2,
In a method for insert injection molding of a wire, a. A sleeve is placed on a wire having one end fixed to the mold side and positioned in the cavity, b. Filling the cavity in which the wire and the sleeve are located as described above with resin, and then forcibly pulling the sleeve out of the cavity to leave the wire in the resin; c. The method is characterized in that the mold is cooled to cure the resin in the cavity, the mold is opened, and a molded product containing the wire is taken out.

Further, in the invention according to claim 3,
The invention according to claim 1 or 2, wherein after inserting the sleeve into the cavity, a wire is inserted into the sleeve to position the wire and the sleeve in the cavity.

Further, in the invention according to claim 4,
According to the first or second aspect of the present invention, a sleeve in which a wire is inserted in the sleeve in advance is positioned in the cavity.

Further, in the invention described in claim 5,
In the invention described in claim 1, 2 or 3 or 4, the number of wires positioned in the cavity is one or more.

Further, in the invention according to claim 6,
In the invention according to claim 5, inserting a stranded wire into a molded product by arranging a plurality of wires in a cavity and rotating the sleeve when the sleeve is retracted or withdrawn to twist the wire. It is characterized by the following.

Further, in the invention according to claim 7,
In a mold for insert injection molding of a wire rod, a. Providing a sleeve containing a wire so as to freely enter and exit the cavity, providing a wire fixing means on a tip side of the sleeve on a mold side, and further providing a gate on a tip side of the sleeve; b. After the tip of the wire inserted into the sleeve is fixed by the wire fixing means, the cavity is filled with resin, and the sleeve retreats by the flow front pressure of the filled resin to leave the wire in the cavity. It is characterized by having such a configuration.

Further, in the invention according to claim 8,
In a metal mold for insert injection molding of a wire rod, a spring for biasing a force in a forward direction with respect to a sleeve is provided.

Further, in the invention according to claim 9,
In a mold for insert injection molding of a wire rod, a. Providing a sleeve containing a wire, which is freely movable in and out of the cavity, and providing a wire fixing means on a tip side of the sleeve on a mold side; b. After the tip of the wire inserted into the sleeve is fixed by the wire fixing means, the resin is filled in the cavity, and then the sleeve is forcibly pulled out of the cavity to leave the wire in the resin. Is provided.

Further, according to the tenth aspect of the present invention, in the seventh or eighth or ninth aspect of the present invention, the wire is previously inserted into the sleeve and inserted into the cavity. It is assumed that.

Further, according to an eleventh aspect of the present invention, in the seventh or eighth or ninth or tenth aspect, the sleeve has a two-part structure.

Further, according to a twelfth aspect of the present invention, in the seventh or eighth or ninth or tenth or eleventh aspect, a step is formed at the tip of the sleeve.

[0017]

In the method of insert injection molding of a wire according to the present invention and the mold using the same, before filling the resin, for example, a wire having a fine diameter is placed in a sleeve for protecting the wire from the pressure of filling the resin. Then, one end of the wire exposed from the tip of the sleeve is fixed to the mold side using wire fixing means. Next, a molten resin is filled into the cavity from a resin filling nozzle via a runner, a sprue, and a gate.

When the flow front of the molten resin filled in this way reaches the tip of the sleeve, the sleeve retreats due to the flow front pressure, and only the wire is gradually exposed from the front end of the sleeve into the cavity. At this time, turbulence does not occur because the front end of the sleeve is at the front end of the molten resin, the resin pressure becomes uniform around the wire rod, and the resin is filled with the retreat of the sleeve, There is no displacement of the wire from a predetermined position, and the wire is not further deformed.

When the sleeve is retracted to the prescribed position outside the cavity and the filling of the molten resin into the cavity is completed, the filling of the resin is stopped, the mold is cooled, and after the resin is cured, the cavity is opened. Can be obtained. In addition, when the sleeve is rotated during retreat, twisting can be applied to a plurality of wires in the cavity, and as a result, a stranded wire can be inserted into a molded product.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In a cavity formed by clamping of a fixed side and a movable side of a mold for insert molding of a wire, a sleeve in which a wire whose one end is fixed to the mold is inserted is freely movable. Built in. As long as the gap between the sleeve and the wire can be freely inserted and removed, it is preferable that the gap is small for preventing the resin from entering and for dimensional accuracy. The number of wires may be one, or two or more.

The distal end of the wire is fixed to the outside of the cavity by a wire fixing means such as a mold clamp of a molding machine or a slide insert of an external drive source. When the resin is supplied from the resin filling nozzle, the resin is supplied to a runner, a sprue,
It passes through the gate and fills the cavity.

When the flow front of the resin reaches the tip of the sleeve installed in the cavity, the sleeve retreats due to the flow front pressure of the resin, and the interior wire is gradually exposed in the cavity from the front end side. Note that the sleeve may be pulled out of the cavity by forced means instead of the flow front pressure. At this time, since there is a sleeve at the front of the resin, the resin pressure becomes uniform around the wire rod, and further, the resin is gradually filled by the retreat of the sleeve. You.

In the case where the sleeve retreats due to the resin pressure, a spring or the like is provided to apply a slight force to the sleeve in the cavity direction so that the sleeve does not retreat earlier than the flow front. This has the effect of better synchronizing the movement of the flow front and the sleeve.

After the sleeve is retracted to a predetermined position outside the cavity, filling of the resin is stopped, and then, after the resin is cured, the cavity is opened to obtain a molded product in which the wire is inserted at a desired position. .

The position where the wire and the sleeve surrounding the wire are installed is determined by the flow path (flow direction) of the resin in the cavity.
May be parallel to, or perpendicular to, or at some other angle. In this case, the sleeve moves forward and backward using a driving source such as air pressure, hydraulic pressure, or electric power. Also, in the cavity,
If the sleeve is set at an angle where it is difficult for the retreating force to be applied to the sleeve, fill the cavity with the resin once, then forcibly pull out the sleeve and leave the wire in the resin by insert molding. Do.

When a sleeve that can rotate as it advances and retreats is incorporated into the cavity, and two or more wires are inserted into the sleeve, and when the sleeve is retracted in the cavity, rotation is given simultaneously. The wire is twisted. As a result, a molded product in which the stranded wire is inserted can be obtained.

The sleeve may have a split structure so that the wire can be easily inserted. Also, this sleeve
The structure may be a structure incorporated in a mold, or a structure in which a cartridge type holding a wire in advance is set in the mold and used each time. The cross-sectional shape of the wire is arbitrary, such as circular or polygonal. The material of the wire includes a material other than metal.

[0028]

Embodiment 1 (corresponding to claims 1, 3, 4, 7, 8, and 10) FIG. 1 is an explanatory view of a molded article formed in this embodiment. The molded product A shown in FIG. 1 has a cylindrical portion B at the center, large-diameter steps C at both ends, and a wire D inserted at the center of the shaft. In this molded product A, the diameter of the cylindrical portion B is 2 mm, the length of the cylindrical portion B is 20 mm, the total length is 30 mm, and the diameter of the large-diameter step portion C is 6 mm.
mm, and the wire D inserted in the center of the cylindrical portion B is made of a stainless alloy having a diameter of 0.15 mm, and is inserted into the central axis with a coaxiality of 0.1 mm or less. Things.

FIG. 2 shows a nozzle 6 and a mold which are part of an injection molding machine for molding the molded article A, and FIG.
FIG. 3 is a process explanatory view of a method for molding the molded article A shown in FIG. 1 using the mold shown in FIG. First, an injection molding machine SG-75-H manufactured by Sumitomo Heavy Industries, Ltd. was used for the injection molding machine shown in FIG. 2, and a liquid crystal polymer (Vectra E130i, a product name of Polyplastics Co., Ltd.) was used for the resin.

The injection molding die shown in FIG.
, Movable frame 2, fixed mold 3 fixed thereto, movable mold 4, cavity 5 formed by fixed mold 3 and movable mold 4, nozzle 6, sprue 7, runner 8, gate 9, wire holder Pin 10, 10a, sleeve guide 1
1. A sleeve 12 guided in the sleeve guide 11 and capable of entering and leaving the cavity 5;
Is a main component of the spring 13 that biases the spring 13 in the forward direction. The gate 9 is located on the tip side of the sleeve 12. In the figure, reference numeral 12a denotes a hole provided at the center of the sleeve 12 for inserting the wire D. The rear of the hole 12a has a slightly larger diameter so that the wire D can be easily inserted from the rear. An air cylinder 15 presses (fixes) and releases the wire D by sliding the wire pressing pin 10a.

Next, a process of molding the molded product A shown in FIG. 1 using the above-described injection molding machine will be described with reference to FIG.
First, the wire D is inserted into the hole 12 a of the sleeve 12 from behind the sleeve 12, and the tip D ′ of the wire D is slightly exposed from the tip of the sleeve 12. In this state, the sleeve 12 is advanced into the cavity 5, and the wire D
The tip D 'of the wire D is fixed by positioning the tip D' of the wire D between the wire holding pins 10 and 10a and driving the air cylinder 15 to operate the wire holding pins 10, 10a. FIG. 3A shows this state.

Next, the nozzle 6 → the sprue 7 → the runner 8
→ When filling of the cavity 5 with the resin is started from the gate 9, the resin is first filled into the tip side of the sleeve 12, and the flow front reaches the tip end of the sleeve 12 (FIG. 3).
(B)). When the filling of the resin further continues, the sleeve 12 is exposed to the front end of the wire D by the flow pressure of the resin, leaving the wire D exposed in the cavity 5 from the front end side.
(FIG. 3C), and stops when the tip comes out of the cavity 5. At this time, the resin is filled in the entire cavity 5 (FIG. 3D). And
When the mold is cooled and the mold (cavity 5) is opened after the resin is cured, a molded product A shown in FIG. 1 having a wire D inserted at the center is obtained.

This molded product A is shown in FIG.
In the cross section, the average value of the deviation of the central axis is SEC. A
0.05 mm, SEC. 0.06 mm for B, SE
C. In C, a deviation of 0.05 mm was recognized, but this was an extremely small deviation as compared with the conventional insert injection molding method, as in the comparative example described below, and the standard value could be satisfied.

The wire (wire D) for the sleeve 12 may be inserted into the sleeve 12 in advance, or the sleeve 12 may be inserted into the cavity 5 first and then inserted into the cavity 5. A wire is inserted into the sleeve 12 and the tip D 'is inserted into the sleeve 1
2 may protrude from the tip.

[0035]

COMPARATIVE EXAMPLE As shown in FIG. 4 (A) before resin filling and (B) after resin filling, a molded product A shown in FIG.
The molding was performed in the same manner as in Example 1 except that both ends were fixed. As a result, in the cross-section of the cylindrical portion B shown in FIG. In A, 0.
3 mm, SEC. B, 0.4 mm, SEC. In C, the deviation of the wire D was as large as 0.2 mm, and the specifications of the molded product could not be satisfied. Table 1 compares the average value of the deviation of the wire D from the central axis when five samples were formed for Example 1 and Comparative Example 1.

[0036]

[Table 1]

[0037]

Embodiment 2 (corresponding to claims 2, 5, and 9)
In the cavity 5, resin is filled from a direction perpendicular to the insertion direction of the wire D and the two sleeves 12-1 and 12-2, and the sleeves 12-1 and 12-2 are forcibly forced by mechanical means. Retract from the cavity 5 (withdraw)
It is to let. The molded product A-1 is shown in FIGS.
As shown in (C), a vertical axis B-1 and B-2 of a quadrangular cross section are integrally formed on a horizontal axis A-1 of a circular cross section, and a wire is provided at a central portion in the vertical axes B-1 and B-2. This is a configuration in which C-1 and C-2 are inserted.

FIG. 6 shows an apparatus for molding the above-mentioned molded article A-1. The same reference numerals as those in FIG. 2 denote the same structures and functions as those in FIG. Only different structural parts will be described. First, cavity 5
In FIG. 2, the gate 9 for filling the inside of the resin is at the front end side of the sleeve 12, but in the present embodiment, it is perpendicular to the sleeves 12-1 and 12-2.

The bases of the two sleeves 12-1 and 12-2 for protecting the wires C-1 and C-2 are fixed to a slidable sleeve mounting plate 12b guided by a sleeve guide pin 12c. ing. The sleeve mounting plate 12b is connected to a cylinder rod 14a of an air cylinder 14 via a connecting rod 12e.
b slides backward using the sleeve guide pin 12c as a guide, and connects the sleeves 12-1 and 12-2 to the cavity 5;
Moves in or retracts from cavity 5 (pulls out)
It is configured to be able to. In FIG. 6, reference numeral 15 denotes an air cylinder for driving the wire pressing pins 10, 10a for fixing the tips of the wires C-1, C-2.

In order to form the molded product A-1, a liquid crystal polymer (Vectra E130i (trade name, manufactured by Polyplastics Co., Ltd.)) is injected into the cavity 5 by an injection molding machine (SG-75-H, an injection molding machine manufactured by Sumitomo Heavy Industries, Ltd.). ) Was used for injection molding. The resin was filled into the cavity 5 through a sprue 7, a runner 8 and a gate 9. The molding conditions are as follows: the filling time is 0.25 sec, the mold temperature is 90 ° C., and the resin is at the cylinder temperature from the tip of the nozzle head at 330, 34 °.
0, 320, 305, and 290 ° C.

7 to 10 show a molding process. First, FIGS. 7A and 7B show wires C-1, C before filling with resin.
-2 is fixed with the wire holding pins 10, 10a,
In this state, the sleeves 12-1 and 12-2 are advanced most. FIGS. 8A and 8B show that the resin is filled through the sprue 7, the runner 8, and the gate 9, and the sleeves 12-1 and 12
2 shows a state in which the cavity 5 having a capacity other than -2 is filled with resin. FIGS. 9 (A) and 9 (B) show that the resin is filled, the air cylinder 14 is operated, and the sleeve mounting plate 12b is formed.
Are moving the sleeves 12-1 and 12-2 out of the cavity 5. FIGS. 10 (A) and 10 (B)
The sleeves 12-1 and 12-2 are out of the cavity 5. The sleeves 12-1 and 12-2 have the cavity 5
After going out, the mold is cooled, and after the resin is cured, the cavity 5 and the holding pins 10, 10a are opened to take out the molded product A-1, and the gap between the wires C-1, C-2 is measured. did. At this time, the gap between the wires C-1 and C-2 was 0.02 mm or less, and the parallelism was maintained.

[0042]

Comparative Example 2 In Example 2, wires C-1, C-
11 was formed in the same manner as in Example 2 except that both ends were fixed by wire holding pins 10 and 10a inside the cavity 5 as shown in FIG. As a result, the gap between the respective wires C-1 and C-2 is 0.3 to less.
0.5 mm, biased toward the flow end in the cavity 5,
The parallelism between the wires C-1 and C-2 was not maintained. In particular, the displacement of the wire C-1 closest to the gate 9 was large.

[0043]

Third Embodiment In the cavity 5 of the first embodiment, as shown in FIG.
The two holes 12a 'and 12a "are formed in the hole 12a.
a ′, 12a ″, two stainless steel wires C-1 and C-2 each having a diameter of 0.15 mm are inserted one by one, and the air motor of 60 revolutions per second is used simultaneously with the start of filling of the sleeve 12. Injection was performed under the same molding conditions as in Example 1 except that the resin was filled while rotating along with the retraction via a timing belt or the like.

FIG. 12A shows a state in which the cavity 5 is closed and the ends of the wires C-1 and C-2 are connected to the wire holding pins 10 and 10.
10a, the state in which the sleeve 12 is advanced most, and before the resin is filled. FIG. 12B shows a state in which the wires C-1 and C-2 are twisted by being retracted by resin pressure or forcing means while applying rotation to the sleeve 12, and FIG. The cavity 5
This is a state in which the stranded wire E is retracted outside and the stranded wire E is inserted into the molded product.

[0045]

Fourth Embodiment (corresponding to claim 12) In the first embodiment,
The shape of the sleeve 12 to be used is shown in FIGS.
Injection molding was performed in the same manner as in Example 1 except that a sleeve 12 having a shape in which a step portion 12j was formed at the tip as shown in (C) was used. The resin is filled up to the position shown in FIG. 13B, the sleeve 12 is pushed out of the cavity 5, and after the resin is hardened, the sleeve 12 is retracted to the protruding position as shown in FIG. The cavity 5 was opened and the molded product A was taken out. As a result, a concave portion A 'is formed on one end surface of the molded product A, and the tip D' of the wire D is formed therein.
Could be taken out with 3 mm exposed. The rear end D ″ was not deformed, and a molded product A having a coaxiality of 0.05 mm was obtained. In this molded product A, for example, the rear end D ″ of the wire D exposed in the concave portion A ′ was electrically connected. Terminals.

[0046]

Embodiment 5 (corresponding to claim 11) In this embodiment, the sleeve 12 used for protecting the wire D has a two-part structure of an upper sleeve 12f and a lower sleeve 12g as shown in FIG. A molded article A similar to that of Example 1 was molded. 14A and 14B, reference numeral 12h denotes a positioning pin formed on the divided surface, and reference numeral 12i denotes a hole into which the positioning pin 12h fits. The sleeve 12 having the split structure has a hole 12
This facilitates the supply of the wire D into the inside a.

FIG. 15 schematically shows a mold and an injection molding machine which can insert the sleeve 12 having the split structure into the cavity 5 from outside to form a molded product, and further have a cylinder mechanism for driving the sleeve. FIG. First, an injection molding machine (an injection molding machine SG manufactured by Sumitomo Heavy Industries, Ltd.) shown in FIG.
-75-H) and a liquid crystal polymer (Vectra E130i, a product name of Polyplastics Co., Ltd.) as a resin.

The injection molding die shown in FIG. 15 is formed by the fixed frame 1 and the movable frame 2, the fixed die 3 and the movable die 4 fixed thereto, and the fixed die 3 and the movable die 4. Cavity 5, nozzle 6, sprue 7, runner 8, gate 9, wire holding pins 10, 10a, sleeve guide 1
1, a sleeve 12 guided in the sleeve guide 11 and capable of entering and exiting the cavity 5; a sleeve press spring 13; an air cylinder 16 interlocked with the sleeve press spring 13; a rod rod 16a of the air cylinder 16; A supply groove 17 into which the sleeve 12 can be supplied (inserted) is a main component.

Next, the steps of molding the molded article A shown in FIG. 1 using the above-described injection molding machine will be described with reference to FIGS. 16 (A) to 16 (D). First, the mold is clamped, and the cavity 5 is formed by the fixed mold 3 and the movable mold 4. At this time, the wire holding pins 10, 10a are opened. Next, the wire D is provided inside the sleeve 12 and the sleeve 12 is inserted from the supply groove 17 into the sleeve guide 11 with the distal end D 'being exposed by a specified amount (FIG. 16A). The air cylinder 16 having the spring 13 is operated to push the sleeve 12 into the cavity 5 by the rod 16a.

When the pushing is completed, the tip D 'of the wire D passes through the wire hole 5a opposite to the insertion of the cavity 5, and the wire D15 previously opened by the air cylinder 15 to the extent that the tip D' of the wire D can be inserted. A specified amount is inserted between the holding pins 10 and 10a. Then, the air cylinder 15 is driven, and the wire holding pins 10 and
The tip D 'of the wire D is fixed by 10a (FIG. 16B).

Next, as in the first embodiment, when filling of the cavity 5 with resin is started from the nozzle 6 → sprue 7 → runner 8 → gate 9, the sleeve 12 exposes the wire D into the cavity 5 by this resin pressure. Spring 13 while
The rod retreats against the rod rod 16a and eventually stops (FIG. 16C). Then, the mold is cooled, and after the resin is cured, the mold (the cavity 5 and the wire pressing pins 10, 10a) is opened (FIG. 16D). Next, when the molded article was taken out from the cavity 5, the molded article A shown in FIG. 1 in which the wire D was inserted at the center was obtained.

As in the case of the first embodiment, the molded product A has a SEC. A, 0.005 m, SEC. B at 0.06 mm, SEC.
In the case of C, the wire D was formed in a very small range of 0.05 mm. In this embodiment, the split sleeve is used as the sleeve. However, a method in which a wire cut in advance from the head (rear portion) to a predetermined length is inserted using the integrated sleeve shown in Embodiment 1 is used. However, a similar effect can be obtained.

[0053]

As described above, according to the present invention, a resin is filled in a state in which a wire is protected by a sleeve in a cavity,
The wire is prevented from being deformed by the resin pressure by forming the wire while remaining in the resin while retracting the sleeve in accordance with the filling. As a result, there is an effect that the wire can be inserted at a predetermined position in the molded product with high accuracy.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a molded product according to a first embodiment.

FIG. 2 is an explanatory view of an injection molding machine for insert injection molding used in the embodiment.

FIG. 3 is an explanatory view of a forming step in the first embodiment.

FIG. 4 is an explanatory diagram of Comparative Example 1.

FIG. 5 is an explanatory diagram of a molded product according to a second embodiment.

FIG. 6 is an explanatory view of a molding machine according to a second embodiment.

FIG. 7 is an explanatory view of a molding step in the second embodiment.

FIG. 8 is an explanatory view of a molding step in the second embodiment.

FIG. 9 is an explanatory view of a molding step in the second embodiment.

FIG. 10 is an explanatory view of a molding step in the second embodiment.

FIG. 11 is an explanatory view of a molding step in Comparative Example 2.

FIG. 12 is an explanatory view of a forming step in the third embodiment.

FIG. 13 is an explanatory view of a molding step in the fourth embodiment.

FIG. 14 is an explanatory view of a split sleeve.

FIG. 15 is an explanatory view of a molding machine using a split sleeve.

FIG. 16 is an explanatory view of a molding step in the fifth embodiment.

[Explanation of symbols]

 A Molded product A-1 Horizontal axis B Cylindrical part B-1, B-2 Vertical axis C Large diameter step part C-1, C-2 Wire D Wire D 'Tip E Stranded wire 1 Fixed frame 2 Movable frame 3 Fixed metal Mold 4 Movable mold 5 Cavity 6 Nozzle 7 Sprue 8 Runner 9 Gate 10, 10a Wire holding pin 11 Sleeve guide 12 Sleeve 12a Hole 12b Sleeve mounting plate 12c Sleeve guide pin 13 Spring 14 Air cylinder 14a Cylinder rod 15 Air cylinder 16 Air cylinder 16a Rod rod 17 Supply groove

Continued on the front page (72) Inventor Shunichi Sai Rats 1-11-1 Hourai-cho, Fukushima City, Fukushima Prefecture F-term in Tohoku Munekata Corporation (reference) 4F202 AD03 AD12 AD15 AD20 AD35 AG03 AG14 AH35 CA11 CB12 CK06 CK25 CQ05 CQ07 4F206 AD03 AD12 AD15 AD20 AD35 AG03 AG14 AH35 JA07 JB12 JF05 JF06 JL02 JN25 JQ06 JQ81

Claims (12)

[Claims] 1. A method comprising: a. A sleeve is placed on a wire having one end fixed to the mold side and positioned in the cavity, b. Filling the resin from the fixed side of the wire into the cavity in which the wire and the sleeve are positioned as described above, and causing only the sleeve to recede by the flow pressure of the filled resin so that the wire remains in the resin; c . After cooling the mold and curing the resin in the cavity, open the mold and take out the molded product containing the wire. D. A method for insert injection molding a wire rod. 2. A method comprising: a. A sleeve is placed on a wire having one end fixed to the mold side and positioned in the cavity, b. Filling the resin into the cavity in which the wire and the sleeve are located as described above, and then forcibly pulling the sleeve out of the cavity to leave the wire in the resin, c. The mold is cooled to cure the resin in the cavity, and the mold is opened to take out a molded product containing the wire rod. D. A method for insert injection molding a wire rod. 3. The method according to claim 1, wherein after the sleeve is inserted into the cavity, the wire is inserted into the sleeve to position the wire and the sleeve in the cavity. 4. The insert injection molding method for a wire according to claim 1, wherein the wire in which the wire is inserted in advance is positioned in the cavity. 5. The number of wires placed in the cavity is
3. The method according to claim 1, wherein the number is one or more.
Or the insert injection molding method of the wire rod of 3 or 4. 6. The twisted wire according to claim 5, wherein a plurality of wires are positioned in the cavity, and when the sleeve is retracted or withdrawn, the sleeve is rotated to add twist to the wire, thereby inserting a stranded wire into the molded product. Insert injection molding method for wires. 7. A method according to claim 1, wherein: a. A sleeve containing a wire rod is provided so as to freely enter and exit the cavity, a wire rod fixing means is provided on a tip side of the sleeve on a mold side, and a gate is provided on a tip side of the sleeve; b. After the tip of the wire inserted into the sleeve is fixed by the wire fixing means, the cavity is filled with resin, and the sleeve retreats by the flow front pressure of the filled resin to leave the wire in the cavity. C. A mold for insert injection molding of wire rods, characterized by the following. 8. The mold for insert injection molding of a wire according to claim 7, further comprising a spring for urging the sleeve in a forward direction. 9. A. A sleeve containing a wire, which can freely enter and exit the cavity, is provided, and wire fixing means is provided at a tip side of the sleeve on a mold side; b. After the tip of the wire inserted into the sleeve is fixed by the wire fixing means, the resin is filled in the cavity, and then the sleeve is forcibly pulled out of the cavity to leave the wire in the resin. C. A mold for insert injection molding of wire rods, characterized by the following. 10. The insert injection molding die for a wire according to claim 7, wherein a wire in which a wire is previously inserted into a sleeve is inserted into a cavity. 11. The mold for insert injection molding of a wire according to claim 7, wherein the sleeve has a two-part structure. 12. The mold for insert injection molding of a wire according to claim 7, wherein a step is formed at the tip of the sleeve.