JPH0540978Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an insert molding mold device for molding a product, such as a resin filter, in which an insert material such as a nonwoven fabric is provided inside.

[Conventional technology]

The present applicant has developed the mold shown in FIGS. 2 to 8 as a mold for molding the filter as described above (Japanese Patent Application No. 77667/1983).

The insert injection mold shown in these figures consists of a punching die (upper die) 2 and an injection die (upper die) attached to platens 1 and 1 of a vertical molding machine, respectively.
3, a rotating table (moving mechanism) 5 placed on the bed 4 of the molding machine, a lower die 6, 6 attached to the rotating table 5, and a feeder 7 attached to the punching die 2. .

As shown in FIG. 5, this insert injection molding mold is for molding a filter A in which a cylindrical resin body 8 is provided with an insert material 9 made of non-woven fabric so as to close the hollow part of the resin body 8. The sheet-like nonwoven fabric 10 is fed intermittently at a constant pitch by the feed cylinder 7a of the feeder 7,
Lower the platens 1 and 1 to cut the punching die 2 and the lower die 6.
Punch out the insert material 9 from the nonwoven fabric 10 by
Next, raise the platens 1, 1 and turn the rotary table 5.
is rotated to move the lower mold 6 to the lower side of the injection mold 3, and the platens 1, 1 are lowered so that the injection mold 3 and the lower mold 6 perform injection molding.

Here, in the lower mold 6, as shown in FIG. 6, a lower mold plate 13 is attached to a lower mold mounting plate 11 via spacer blocks 12, 12.
, a plurality of protruding sleeves (die, only one is shown in the figure) 14 are slidably arranged with their axes directed in the vertical direction, and further between the lower die mounting plate 11 and the lower die plate 13, A protruding plate 15 to which the lower end of the protruding sleeve 14 is connected is arranged to be slidable in the vertical direction. The protruding plate 15 is protruded upward by an ejecting pin 16 of the molding machine and is lowered by its own weight, whereby the protruding sleeve 1
4 is made capable of appearing and retracted from the upper surface of the lower mold plate 13, and its upper end surface coincides with the upper surface of the lower mold plate 13 at its lower end. Note that the reference numeral 17 in the figure is a core pin, and inside this core pin there is a through hole 17a connected to an evacuation mechanism (not shown).
is formed.

On the other hand, in the punching die 2, a case 19 is attached to a punching mounting plate 18, a retainer 20 is arranged in the case 19 so as to be slidable in the vertical direction, and a plurality of punches (only one is shown in the figure) are attached to the retainer 20. 21 is attached, and the retainer 20 is pushed down by a piston cylinder 22 arranged on the platen 1 so that the punch 21 projects and fits into the sleeve 14.
Note that the reference numeral 23 in the figure is a stripper.

Next, in the injection mold 3, an injection mold plate 26 having a cavity 25 whose lower side is open is attached to the injection mounting plate 24, and a cavity pin 27 is attached to the injection mold plate 26.
is attached to the punch 21.
The insert material 9 punched out by the protruding sleeve 14 is inserted into the core pin 17 and the cavity pin 27.
and the resin is injected into the cavity 25. Note that in the figure, reference numeral 28 is a tunnel gate, and 29 is a runner.

In such an insert injection molding mold, punching and injection molding of the insert material 9 can be performed in one mold, and therefore, positional shift of the insert material 9 due to transportation of the insert material 9 can be prevented. Therefore, it is possible to obtain the excellent effect of being able to prevent the occurrence of defective products.

[Problem that the invention attempts to solve]

However, in the insert injection mold described above, since the protrusion sleeve 14 is used as a die during punching, when used for a long period of time, the inside of the contact area with the punch 21, that is, the upper end of the protrusion sleeve 14 There is a problem in that the peripheral edge becomes worn. In that case, the upper surface of the protruding sleeve 14 and the protruding sleeve 14
Because the lower surface of the filter (molded product) A is molded by the upper surface of the core pin 17 that penetrates through the upper surface of the core pin 17 during injection molding, a A problem occurred in that burrs were generated on the lower surface of molded product A due to the gaps.

This invention was made in view of the above circumstances,
The purpose is to provide a mold device for insert molding that can prevent the upper end surface of the protruding sleeve 14 from being worn out and prevent burrs from forming on the molded product.

(Means for Solving the Problems) In order to achieve the above object, the present invention has an upper die that includes a punch for punching an insert material from a sheet material, and a die disposed below the punch and fitted with the punch. a mold plate disposed horizontally at a predetermined distance from the punch and forming a cavity; and a cavity pin protruding downward from the mold plate and occupying a space approximately in the center of the cavity. and a lower mold that is movable toward and away from the upper mold, is provided so as to be movable in the vertical direction facing the die or cavity pin, and is located at a lower end while abutting the opposing die. a protruding sleeve that avoids interference with the template, and a core pin that is disposed penetrating through the ejecting sleeve and supports the insert material at a tip portion having a smaller diameter than the inner diameter of the ejecting sleeve; The lower mold is provided with a moving mechanism for moving the sleeve between a position facing the die and a position facing the cavity pin.

[Effect]

In the insert molding mold device of the present invention, first, an insert material is punched out from a sheet material using a punch and a die, the insert material is guided into a protruding sleeve located below the die, and a core pin is inserted into the insert material. After being supported at the upper end, the ejecting sleeve is moved below the cavity of the template by the moving mechanism, and then the space between the template and the ejecting sleeve is closed, and the insert is moved by the cavity pin and the core pin. A molded product is formed by injecting molten resin into the cavity while holding the material.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIG. In this embodiment, a die 30 and an ejecting sleeve 31 are provided in place of the ejecting sleeve 14 of the conventional example shown in FIGS. 2 to 8, and the other configurations are the same as the conventional example. The same reference numerals are used to omit the explanation.

The die 30 is provided below the stripper 23, and the insert material 9 is punched out by the die 30 and the punch 21. Further, a mounting hole 30b is formed in the die 30, communicating with the punching hole 30a of the die 30, into which a vertically movable protruding sleeve 31 is inserted.
This protruding sleeve 31 is cylindrical, and its inner diameter is set to be slightly larger than the outer diameter of the punch 21.

Then, the punch 21, the die 30, the injection mold plate 26 (see FIG. 8), and the cavity pin 27
(see FIG. 8), and a pair of lower molds 33 are constructed mainly from the protruding sleeve 31 and the core pin 17. Furthermore, the protruding sleeve 3
A moving mechanism (rotary table, see FIGS. 2 to 4) 5 is installed below each of the lower molds 33 to move the mold 1 between a position facing the die 30 and a position facing the cavity pin 27. ing.

Next, the case where the filter A is molded using the insert molding die device having the above configuration will be described with reference to FIGS. 1 and 6.

First, as in the prior art, one of the protruding sleeves 31 is positioned at its rising end and the platen is lowered to insert the tip of the protruding sleeve 31 into the mounting hole 30b of the die 30. In this state, when the piston cylinder is extended and the retainer is lowered, the punch 21 fits into the punching hole 30a of the die 30, thereby punching out the insert material 9 from the nonwoven fabric 10. The punched insert material 9 is guided from the punching hole 30a of the die 30 into the mounting hole 30b, placed on the upper end surface of the core pin 17 in the protrusion sleeve 31, and vacuum-suctioned through the through-hole 17a. It is maintained by this.

Next, the platen is raised and the rotary table is rotated 180 degrees to remove the protruding sleeve 31.
is moved to the bottom of the injection mold plate 26. continue,
By lowering the platen and lowering the injection mold plate 26 and lowering the ejection sleeve 31, the injection mold plate 26 is brought into close contact with the upper end surface of the ejection sleeve 31 and the upper surface of the lower mold plate 13, and the insert material 9 is lowered. Core pin 17 and cavity pin 2
7. In this state, by injecting molten resin into the cavity 25,
Molded product (filter) A is molded. On the other hand, punching is performed using the punch 21 and the die 30 in the same manner as described above. After the resin is cooled and solidified, the platen is raised. At this time, since the molded filter A remains attached to the core pin 17, the protrusion sleeve 31 is raised and removed from the core pin 17.

In this way, punching and injection molding of the insert material 9 are performed successively and continuously, and the filter A can be smoothly molded. In this case, since the insert material 9 is punched out using the punch 21 and the die 30, the inner peripheral edge of the upper end of the protruding sleeve 31 is not worn out by the punch 21. Therefore, during injection molding, no gap is created between the inner peripheral edge of the upper end of the protruding sleeve 31 and the outer peripheral part of the core pin 17, so it is possible to prevent burrs from forming on the lower surface of the molded product A.

[Effect of idea]

As explained above, the present invention includes a punch for punching an insert material from a sheet material, a die disposed below the punch and fitted with the punch, and a die arranged at a predetermined distance horizontally with respect to the punch. A mold plate is provided that is spaced apart from each other and forms a cavity, and a cavity pin that is provided to protrude downward from the mold plate and occupies a space approximately in the center of the cavity, and that are spaced apart from each other with respect to the upper mold. a protruding sleeve, in which the lower mold is movable in the vertical direction facing the die or the cavity pin, and is positioned at a lower end to abut against the opposing die, thereby avoiding interference with the mold plate; , a core pin that is disposed penetrating inside the ejecting sleeve and supporting the insert material at a tip portion having a smaller diameter than the inner diameter of the ejecting sleeve; Since the lower die is equipped with a moving mechanism for moving it between opposing positions, first punch the insert material from the sheet material using a punch and die, and then place the insert material below the die. After being guided into the ejection sleeve and supported by the upper end of the core pin, the ejection sleeve is moved below the cavity of the template by a moving mechanism, and then the space between the template and the ejection sleeve is closed, and the cavity pin is moved. By injecting molten resin into the cavity with the insert material sandwiched between the insert material and the core pin to obtain a molded product, it is possible to prevent the upper end surface of the protruding sleeve from being abraded and causing burrs on the molded product. It has the excellent effect of being able to continuously manufacture good products without any problems.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing one embodiment of the present invention;
Figures 8 through 8 show the insert injection molding mold previously applied for by the present applicant. Figure 2 is a schematic side view showing the whole, and Figure 3 is the same as that shown in Figure 2.
Fig. 4 is a sectional view taken in the direction of Fig. 2, Fig. 5 is a sectional view showing the filter, Fig. 6 is a sectional view showing details of the punching die and lower die, Fig. 7 is the insert material. FIG. 8 is a sectional view showing a state where the insert material is held and injection molding is performed. 5... Rotating table (moving mechanism), 9... Insert material, 10... Nonwoven fabric (sheet material), 17...
... Core pin, 21 ... Punch, 25 ... Cavity, 26 ... Injection mold plate, 27 ... Cavity pin, 30 ... Die, 31 ... Protrusion sleeve, 3
2...Upper mold, 33...Lower mold, A...Filter.

Claims (1)

[Scope of utility model registration request] The upper mold and the lower mold are installed so that they can approach and separate from each other,
The upper mold includes a punch for punching an insert material from a sheet material, a die arranged below the punch and fitted with the punch, and a die arranged horizontally at a predetermined distance with respect to the punch and the upper and lower molds. The lower mold includes a mold plate that forms a cavity when the space is closed, and a cavity pin that is provided to protrude downward from the mold plate and occupies a space approximately in the center of the cavity. a protrusion sleeve that is movable in the vertical direction facing the die and that contacts the opposing die while avoiding interference with the template by being located at the lower end; a core pin that supports the insert material at a tip portion having a smaller diameter than the inner diameter of the sleeve, and a moving mechanism that moves the protruding sleeve between a position facing the die and a position facing the cavity pin. A mold device for insert molding, characterized in that it is provided in the lower mold.