JPS6049403B2 - Injection mold assembly that coats the outer periphery of the sleeve with a resin layer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in an injection mold assembly that coats the outer periphery of a sleeve with a thin resin layer.

For example, in order to connect two insulated core wires of a communication cable, there is a sleeve-shaped female connector that passes through these insulated core wires, a sleeve-shaped female connector that passes through these insulated core wires, and a sleeve-shaped female connector that is press-fitted into this female connector to connect the two insulated core wires. Sleeve pin type connectors have been put into practical use, which are comprised of a tapered pin male connector that electrically and mechanically connects core wires to each other while destroying their insulation.

As shown in FIG. 1, this female connector 1 consists of a conductive metal sleeve 2 and a thin resin layer 3 covering the outer periphery of the sleeve 2. As shown in FIG. The mold assembly for injection molding this resin layer 3 usually moves toward or away from each other, and a sleeve to be coated with the resin layer is housed between opposing surfaces, and the resin to be coated is injected. A fixed mold and a movable mold each having a mold hole; It includes two positioning pins that are biased, and a knockout means that advances the positioning pins that pass through the movable mold to take out the product from the movable mold when the fixed mold and the movable mold are opened. The product formed by this mold assembly, i.e. the sleeve 2 with the resin layer 3, must remain in the movable mold when the mold is opened, otherwise the knockout means will penetrate the movable mold. The product cannot be removed reliably due to the positioning pin (knockout pin). However, the positioning pin easily adheres to the resin layer 3 coated on the sleeve 2, and there are variations in the contact pressure between the positioning pin and the sleeve, and the product may be damaged depending on the strength of this adhesive force and the variation in contact pressure. The product may separate from the movable mold and remain in the fixed mold, or even if it remains in the movable mold, the product may remain attached to the positioning pin that passes through the movable mold during knockout and may not fall from the movable mold. . In either case, since the product cannot be taken out, the product detection device is activated and the machine operation is stopped, resulting in a decrease in the operating rate. SUMMARY OF THE INVENTION An object of the present invention is to provide an injection mold assembly in which the outer periphery of a sleeve is coated with a resin layer so that the product can be reliably removed from the mold.

The embodiments of the present invention will be described in detail with reference to the drawings.
The figure shows an injection mold assembly according to the present invention! 10,
This mold assembly consists of a sleeve 2 to be coated with a resin layer 3.
first and second molds 14, 14'' each having mold cavities 12, 12 into which resin is housed and into which resin is poured;
A first member that slidably and airtightly passes through the through holes of the molds 14, 14'' and engages the end of the sleeve 2 in the mold recess 5 to position the sleeve 2 at the center of the mold recess. second positioning pins 16, 16''. In addition, since the mold cavity 12'' is larger than the mold hole 12, when the molds 14 and 14'' are opened,
The product remains in the mold cavity 12'' or mold 14''4. Two support mold plates 18, 18'' are arranged on the rear side of the first mold 14, and these mold plates 14 and mold plates 18, 1'' constitute a fixed half of the mold assembly. ing.

The mold plates 18,1' are completely fixed to each other and the mold 14
is supported by a guide means (not shown) so that it can move forward and backward slightly with respect to the template 18. Two support mold plates 20, 2'' are also arranged on the back side of the second mold 1C, and these mold plates 14'' and mold plates 20, 2'' move toward or away from the fixed half. It constitutes a movable half supported by a mold opening/closing means (not shown) so that it can be moved.

The templates 20 and 2' are fixed to each other, and the mold 1C is attached to the template 20.
It is supported by guide means (not shown) so that it can move forward and backward slightly relative to the vehicle. Note that this second mold (
A mold opening/closing means (not shown) is provided for opening and closing the movable mold together with the mold plates 20, 2'. The first positioning pin 16 is attached to an enlarged flange 1 slidably disposed within the template 18a.
6a, and this flange is always biased by a biasing member 22 such as a spring so as to engage the first locating pin 16 into one end of the sleeve 2.

The second locating pin 16'' has an enlarged flange 16a'' squeezed between knockout plates 24, 24'' which are slidably disposed within a large through hole 20a of the mold plate 20. Through hole 20a of plate 2'
It consists of a cylinder 28 having a piston rod 28a extending through the ``knockout plate 24'' and engaging the knockout plate 24''.

In the illustrated embodiment, this knockout means 26 comprises a second
It also serves as an urging member that urges the positioning pin 16'' to engage the end of the sleeve 2.In order to coat the sleeve 2 with the resin layer 3, the second mold 14'' is opened and closed by the mold opening/closing means. The sleeve 2 is completely opened from the first mold 14 and the sleeve 2 is removed from the first mold 14.
The first positioning pin 16 is fitted into the small diameter portion 16b of the first positioning pin 16 protruding from the mold 14, and then the second mold 14'' is advanced toward the first mold 14 to close them.

Since the second positioning pin 16'' projects from the second mold 14'' by a predetermined amount, the small diameter portion 16 of this positioning pin
b'' fits into the sleeve 2, so that the sleeve 2 is fitted into the mold recesses 12, 12 by means of these positioning pins 16, 16''.
Then, resin is injected from an injector (not shown) into the mold holes 12, 12'' through the runner 30 and the gate 32, so that the outer periphery of the sleeve 2 is coated with the resin layer 3. Since both ends of the sleeve 2 are closed by the first and second positioning pins 16 and 1', resin does not enter the inside of the sleeve 2. Thereafter, the second mold 14'' is fully opened relative to the first mold 14, the cylinder 28 of the knockout means is extended, and the second positioning pin (knockout pin) 16 is inserted through the knockout plates 24, 2C. '' and move the second mold 14 forward.
The mold assembly 10 of the present invention includes a first
a first driving means 34 for driving the mold 14 away from the mold plate 18 and forward by a predetermined stroke toward a second mold 14';
and a second driving means 34'' for moving the second mold 14'' away from the mold plate 20 and forward by a predetermined stroke toward the first mold 14.

In the illustrated embodiment, the first and second drive means 34, 34''
consists of cylinders 36, 36'';
The piston rod 36a passes through holes in the mold plates 18, 18'' and engages with the rear surface of the first mold 14, and the piston rod 36a of the cylinder 36
The piston rod 36a'' passes through the mold plate 2'' and the holes in the knockout plates 24, 24'' and is inserted into the second mold 14.
The first drive means 34 engages the movable half, or the second mold 14, with the fixed half, or the first mold 14.
Since the first mold 14 is driven forward when the first mold 14 is opened, the first positioning pin 16 moves relatively backward within the first mold 14, so the first positioning pin 16 is moved between the sleeve 2 and the sleeve 2. The first positioning pin 16 is separated from the resin layer 3 coated thereon, and therefore, the first positioning pin 16 is forcibly separated from the resin layer 3 even if it is attached to the resin layer. Further, the second driving means 34'' is
After the second mold 14'' is completely opened relative to the first mold 14 and before the knockout means 26 is actuated, the second mold 14''
By driving the mold forward, the second positioning pin 16'' moves the second mold 14'' relatively backward, thereby separating the second positioning pin 16'' from the sleeve 2 and the resin layer 3 coated thereon. Therefore, even if the second positioning pin 16'' is attached to the resin layer, it is forcibly separated from the resin layer 3. Therefore, the first and second positioning pins 16, 16'' are separated from the resin layer. Since the product is not stuck to the product due to adhesion, the product is firmly held in the second mold 14''.
4 and 14'' are opened, and the second positioning pin 16'' is advanced to ensure that it falls from the mold 14''.

The stroke of the first drive means 34 may be such that the enlarged flange 16a of the first positioning pin 16 abuts against the bottom surface of the recess of the template 18, and then the small diameter portion 16b comes out of the sleeve 2, and the stroke of the second drive means The stroke of the means 34'' is the second
It is sufficient that the small diameter portion 16b'' of the positioning pin 16'' can be removed from the sleeve 2. In the above embodiment, the first and second molds 14, 14'' are arranged to open and close in the horizontal direction, but they may be arranged to open and close in the vertical direction.

According to the present invention, as described above, the first and second positioning pins are forcibly separated from the product when taking out the product, so that the product does not remain in the mold on the opposite side, or when the product is removed from the mold. Even if the product remains in the mold, it will not fail to fall out of the mold during knockout, so the product can be reliably taken out, which improves the operating rate of the machine, and the mold can be closed with the product remaining in the mold. Since there is no safety device, the structure of the mold assembly is simplified and economical.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a product formed by the mold assembly of the present invention, and FIG. 2 is a cross-sectional view of the main part of the mold assembly of the present invention. 1...Female connector, 2...Sleeve, 3
... Resin layer, 10 ... Mold assembly, 1
2,12″... type hollow, 14,14″...
First and second molds, 176, 16''...First and second positioning pins, 22...Biasing member, 26...
... Knockout means, 34, 34''... First and second driving means, 36, 36''... Ulinda.

Claims (1)

[Scope of Claims] 1. A first sleeve that moves relative to each other so as to face each other or move away from each other, and has a mold depression into which a resin layer is injected into which a sleeve to be coated with a resin layer is housed. and a second mold, and slidably penetrates the first and second molds and engages an end of the sleeve in the mold recess to position the sleeve within the mold recess. first and second positioning pins; a biasing member that biases the first and second positioning pins toward the sleeve; and a biasing member that biases the first and second positioning pins toward the sleeve; The first and second molds are opened in an injection mold assembly in which the outer periphery of a sleeve is coated with a resin and has a knockout means for advancing a positioning pin to take out a product from the second mold. At this time, the first positioning pin is moved relatively backward in the first mold to separate the first positioning pin from the sleeve and the resin layer coated on the sleeve. the second mold
a first driving means for driving a predetermined stroke forward toward the mold; and after the first and second molds are completely opened and before driving the knockout means, the second positioning pin The second mold is driven forward by a predetermined stroke toward the first mold so that the second positioning pin is separated from the sleeve and the resin layer by moving relatively backward in the second mold. An injection mold assembly for coating an outer periphery of a sleeve with a resin layer, further comprising a second driving means. 2. An injection mold assembly for coating an outer periphery of a sleeve with a resin layer according to claim 1, wherein the first and second driving means are cylinders. 3. An injection mold assembly in which the outer periphery of the sleeve is coated with a resin layer according to claim 1 or 2, wherein the knockout means also serves as a biasing member for the second positioning pin.