JP2742295B2 - Molding device for molded products with oblique holes - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for molding a molded article having oblique holes, and more particularly to an apparatus for molding a molded article having oblique holes that can be reduced in size.

[Prior art and its problems]

Conventionally, a molding apparatus for molding a molded article having oblique holes is configured as shown in FIG.

That is, the molding apparatus includes a lower mold 31, an upper mold 32 capable of coming into contact with and separating from the lower mold 31, a core 33 and an ejector pin 34 located at a central portion of the lower mold 31, 32
The middle mold 35 located at the center of the lower mold 31 and the upper mold 32
The oblique hole core 3 which can penetrate through the lower mold 31 and the upper mold 32 and is
It has 6 and 37.

The middle mold 35 located at the center of the upper mold 32 includes the upper mold
Cavity 45 formed when 32 abuts on lower mold 31
A sprue 38 for injecting a molding material is provided inside,
The core 33 located at the center of the lower mold 31 is capable of protruding and retracting into the cavity 45. By molding the core 33 in a state of protruding into the cavity 45, the center 33 of the molded product 39 is formed. A hole 40 is formed in the hole.

Further, the ejector pins 34 project the molded product 39 molded in the cavity 45 and take it out.

The oblique hole cores 36 and 37 are adapted to move into and out of the cavity 45 by the operation of the cylinders 41 and 42 connected thereto.

Then, when molding a molded product having oblique holes using the molding apparatus configured as described above, first, the upper mold 32 on the movable side is brought into contact with the lower mold 31 on the fixed side, and And the upper mold 32 and the lower mold 31 are formed.
The cores 36, 37 for oblique holes provided in the cylinders 41, 42
Is operated to cause the protrusion into the cavity 45.

Next, a molding material is filled into the cavity 45 from the sprue 38 of the middle mold 35 located at the center of the upper mold 32,
Hold as it is until the molding material hardens.

After the molding material is completely cured, the cylinders 41 and 42 of the oblique hole cores 36 and 37 are operated to operate the oblique hole cores.
36, 37 are extracted from the cavity 45, and the upper mold 32 is removed.
And the upper mold 32 is separated from the lower mold 31 and opened, and the ejector pin 34 located at the center of the lower mold 31 is actuated. The molded product 39 formed by the above is protruded and taken out to the outside, and thus the molded product 39 having the oblique holes 43 and 44 is molded.

However, in the conventional molding apparatus as described above, the operation of the cylinders 41 and 42 causes the oblique hole cores 36 and 37 to protrude and retract into the cavity 45. In the case where is formed, the cylinders must be provided by the number of the oblique holes, and therefore, there is a problem that the whole apparatus is enlarged.

In addition, since the entire apparatus is increased in size by providing a plurality of cylinders, a molding apparatus for simultaneously molding a plurality of molded articles having a plurality of oblique holes cannot be obtained.
Therefore, when a plurality of molded products are molded, they must be molded one by one, which has a problem that the working efficiency is extremely deteriorated and the productivity is significantly reduced.

The present invention has solved the above-mentioned problems of the related art, and it is possible to reduce the size of the whole and to easily form a plurality of oblique holes simultaneously in one molded product, It is an object of the present invention to provide a molding device for a molded article having oblique holes, in which it is easy to simultaneously mold a plurality of molded articles having a plurality of oblique holes.

[Means for solving the problem]

In order to solve the above problems, the present invention provides a lower mold,
A first molding die which can be brought into contact with and separated from the lower die, forms a cavity in cooperation with the lower die, and further has at least one through hole penetrating through the cavity; , And located outside the first mold,
The first molding die comprises a second molding die in which a long groove having a T-shaped cross section extending obliquely toward a contact surface with the lower die from at a portion corresponding to the through hole is formed in at least one place. An upper mold, an oblique hole core provided in the long groove and capable of protruding and retracting into the cavity through the through hole, and being provided in the first molding die and capable of protruding and retracting into the through hole A ball plunger for restricting the oblique hole core into and out of the cavity, and wherein the oblique hole core abuts on and separates from the lower mold to allow the oblique hole core to move into the first mold. Means for protruding and retracting into the cavity through the through hole.

[Action]

According to the present invention, by adopting the above-described means, the molded article having the oblique holes can be configured such that the first mold of the upper mold including the first mold and the second mold is brought into contact with the lower mold. And a second molding die located outside the first molding die is brought into contact with the first molding die, and the oblique hole core located in the long groove of the second molding die. Through a through hole of the first mold, into a cavity formed between the lower mold and the first mold, and then fill the cavity with a molding material, cure and mold. Further, thereafter, the second mold is separated from the lower mold, the core for the oblique hole in the long groove is extracted from the cavity, and the first mold is separated from the lower mold to open the mold. A molded article having an oblique hole therein is molded.

〔Example〕

Hereinafter, embodiments of the present invention shown in the drawings will be described.

1 to 4 show an apparatus for forming a molded article having oblique holes according to the present invention. FIG. 1 is a schematic sectional view showing the whole, and FIG. 2 is a partial sectional view of the apparatus shown in FIG. Figure, third
The figure is a bottom view of what is shown in FIG. 2, and FIG. 4 is a cross-sectional view taken along line AA of FIG.

That is, the apparatus for molding a molded article having oblique holes shown in FIGS. 1 to 4 includes a lower mold 1 and a first molding die 2 disposed so as to be able to contact and separate from the lower mold 1. And an upper mold 4 comprising a second mold 3, a middle mold 5 located at the center of the first mold 2 and the second mold 3, and a core 6 located at the center of the lower mold 1. And an ejector pin 7.

The first mold 2 of the upper mold 4 has a truncated cone shape and a hollow central portion, and the middle mold 5 is provided in the hollow central portion so as to be vertically movable. A plurality of (two in this embodiment) through holes 8 and 9 penetrating toward the hollow center portion are provided on the outer peripheral surface, and the ball plunger 1 is provided in the through holes 8 and 9.
Numerals 0 and 11 cause the balls 10a and 11a at their tip portions to protrude and retract from a direction perpendicular to the penetrating direction.

Note that the ball plungers 10 and 11 are each provided with a biasing member such as a spring provided inside the balls 10a and 1a at the distal end.
1a is to appear and disappear.

The second molding die 3 is located outside the first molding die 2, and a tapered space 12 that matches the truncated conical outer shape of the first molding die 2 is provided on the inner peripheral side thereof. Further, a long groove having a T-shaped cross section extending from a portion corresponding to the through holes 8 and 9 of the first molding die 2 toward a contact surface with the lower die 1 is formed in a tapered surface of the tapered space 12. A plurality (two in this embodiment) of holes 13 and 14 are formed. Oblique hole cores 15 and 16 are provided movably in the long grooves 13 and 14 with their heads 15a and 16a engaged.
b and 16b are cavities formed between the first mold 2 and the lower mold 1 when the first mold 2 and the second mold 3 abut on the lower mold 1. The projection 17 projects through the through holes 8 and 9 of the first mold 2. Further, annular V-shaped grooves 15c, 16c are provided on the outer peripheral surfaces of the oblique hole cores 15, 16.

The middle mold 5 is provided with a sprue 18 for injecting a molding material into the cavity 17.

The core 6 provided in the center of the lower mold 1 forms a hole 20 in a molded product 19 molded in the cavity 17, and the ejector pin 7 is molded in the cavity 17. The molded product 19 protrudes from the cavity 17.

 Next, the operation of the above will be described.

First, the first mold 2 of the upper mold 4 on the movable side is brought into contact with the lower mold 1 on the fixed side, and the first mold 2
The second molding die 3 located outside is also brought into contact with the lower die 1.

In this case, the outer peripheral surface of the first molding die 2 and the inner peripheral surface of the second molding die 3 are completely adhered by bringing the second molding die 3 into contact with the lower die 1. As a result, the oblique hole cores 15, 16 provided with the heads 15a, 16a engaged in the long grooves 13, 14 of the second molding die 3 have their tip portions 15b, 16b being The ball plunger 10 protrudes into a cavity 17 to be described later through the through holes 8 and 9 of the mold 2 at this time. , 11 are cores for oblique holes by protruding the balls 10a, 11a at the tips into the through holes 8, 9.
The oblique hole cores 15 and 16 are retained in such a manner that their tip portions 15b and 16b project from the through holes 8 and 9, respectively. It has become.

Next, while moving the middle mold 5 located at the center of the first mold 2 and the second mold 3 to a predetermined position,
The core 6 and the ejector pin 7 located at the center of the lower mold 1 are also moved to predetermined positions to form a cavity 17 between the first mold 2, the lower mold 1 and the middle mold.

In the cavity 17 in which the oblique hole cores 15 and 16 and the core 6 are protruded as described above, the middle mold 5 located at the center of the first mold 2 and the second mold 3 is placed. The molding material is injected and filled from the sprue 18 and is held as it is until the molding material is completely cured.

Then, after the molding material is completely cured, the second molding die 3 is moved upward to separate from the lower die 1, whereby the heads 15 a and 16 a of the oblique hole cores 15 and 16 are moved. By relatively moving inside the long grooves 13 and 14 of the second mold 3, the tips 15 b and 16 b are extracted from the cavity 17 through the through holes 8 and 9 of the first mold 2.

In this case, the ball plungers 10 and 11 which lock the balls 10a and 11a at the distal end into the V-grooves 15c and 16c on the outer peripheral surface of the oblique hole cores 15 and 16 in the through holes 8 and 9 are oblique holes. When the cores 15 and 16 come out of the through holes 8 and 9, the oblique hole core 1
The cores 5 and 16 are brought into contact with the outer peripheral surfaces of the molds 5 and 16 to enter the first mold 2, thereby allowing the oblique hole cores 15 and 16 to come out of the cavity 17.

Next, the first mold 2 from which the oblique hole cores 15 and 16 have completely come out is separated from the lower mold 1, and the middle mold 5 located at the center of the first mold 2 is also moved to the lower mold 1. The core 6 located at the center of the lower mold 1 is extracted from the cavity 17 and immersed in the lower mold 1.

After that, by operating the ejector pin 7 located at the center of the lower mold 1, the molded product 19 molded in the cavity 17 is protruded upward and taken out, and thus the oblique holes 21 and 22 are removed. The molded product 19 having the shape is formed.

As described above, according to the present invention, the cores 15 and 16 for oblique holes can be protruded and retracted into the cavity 17 by abutting and separating the second molding die 3 from the lower die 1. Therefore, it is not necessary to provide a cylinder for each of the oblique hole cores. Therefore, it is possible to reduce the size of the entire apparatus and to easily form a plurality of oblique holes simultaneously in one molded product. By arranging the devices in series, it is easy to simultaneously mold a plurality of molded products having a plurality of oblique holes.

〔The invention's effect〕

According to the present invention, as described above, the entire apparatus can be reduced in size. Therefore, it is easy to simultaneously form a plurality of oblique holes in one molded product, and the apparatus is reduced in size by reducing the size of the apparatus. Can be provided in a series, so that it is easy to simultaneously mold a plurality of molded products having a plurality of oblique holes, thereby significantly improving work efficiency and improving productivity. It has an effect.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an apparatus for molding a molded article having oblique holes according to the present invention, FIG. 2 is a partial sectional view of the apparatus shown in FIG. 1, FIG. 3 is a bottom view of the apparatus shown in FIG. Figure 2
FIG. 5 is a cross-sectional view taken along the line AA of FIG. 5, and FIG. 5 is a cross-sectional view showing a conventional molding apparatus for molded articles having oblique holes. 1, 31 Lower mold 2 First mold 3 Second mold 4, 32 Upper mold 5, 35 Middle mold 6, 33 Core 7, 34 Ejector pin 8 , 9 ... through hole 10, 11 ... ball plunger 10a, 11a ... ball 12 ... tapered space 13, 14, ... long groove 15, 16, 36, 37 ... oblique hole core 15a, 16a ... head Parts 15b, 16b… Tip parts 15c, 16c… V-grooves 17, 45… Cavities 18, 38… Sprues 19, 39… Molded products 20, 40… Holes 21, 22, 43, 44… Holes 41, 42 …… Cylinder

Claims (1)

(57) [Claims] 1. A lower mold (1), which can be brought into contact with and separated from the lower mold (1), and forms a cavity (17) in cooperation with the lower mold (1). (17) a first mold (2) having at least one through hole (8) (9) penetrating therein, and a first mold (2) located outside the first mold (2); A long groove (1) having a T-shaped cross section extending obliquely from a portion corresponding to the through holes (8) and (9) of the first molding die (2) toward a contact surface with the lower die (1).
3) An upper mold (4) comprising a second mold (3) having at least one hole formed in (14), and the long groove (13) (1).
An oblique hole core (15) provided in 4) and capable of protruding and retracting into the cavity (17) through the through holes (8) and (9).
(16), provided in the first molding die (2), capable of protruding and retracting in the through holes (8), (9), and the cavity () of the oblique hole core (15) (16). 17) With ball plungers (10) and (11) for restricting in / out,
Due to the contact and separation of the second mold (3) with the lower mold (1), the oblique hole cores (15) and (16) move through the through holes (8) and (8) of the first mold (2). A molding device having a slanted hole, wherein the molding device protrudes into and out of the cavity (17) through 9).