JPH0663962A - Air jet valve device of mold - Google Patents

Abstract

PURPOSE:To obtain the air jet valve device of a mold smooth in the operation of a valve disc and easy in assembling and processing by forming a female screw part to a mounting hole and forming a male screw part to a holder to make it possible to screw the holder in the mounting hole and providing a return spring between the holder and a support shaft. CONSTITUTION:The air jet valve device of a mold 1 is constituted so that a support shaft 18 having an axis in a valve disc protruding direction and supported so as to be freely movable in its axial direction is provided to the rear surface of a valve disc and a return spring 24 energizing the valve disc 9 in an anti-protruding direction is provided and the valve disc 9 is allowed to protrude by supplying compressed air to the rear surface of the valve disc of an air jet orifice 13 to supply air from the gap between the inner surface of the air jet orifice 13 and the valve disc 9 to the gap between the mold 1 and a molded product 29. A female screw part 26 is formed to a mounting hole 6 and the male screw part 12 threaded with a female screw 26 is formed to a holder 8 to make it possible to screw the holder 8 in the mounting hole 6 and the return spring 24 is provided between the holder 8 and the support shaft 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air jet valve device for releasing a molded product from a mold in injection molding, compression molding and the like.

[0002]

2. Description of the Related Art For example, in injection molding, a mold and a molded product are completely in close contact with each other, and when the molded product is separated from the mold, a vacuum state is created between the mold and the molded product. Some molds are provided with an air ejection valve device for supplying air between the mold and the molded product because of resistance to removal. As this type of device, there is a conventional one as shown in FIG. 8, in which a mold 41 is a cabinet 42.
And a core 43, and a holder 45 is mounted in a mounting hole 44 formed on the inner surface side of the core 43.
An air ejection hole 46 that opens toward the inner surface of 41 is recessed. A valve body 47 that closes the end opening is attached to the air ejection hole 46, and the valve body 47 can project from the air ejection hole 46. Further, the core 43 is formed with a shaft insertion hole 48 extending from the core back surface to the mounting hole 44, the holder 45 is formed with a through hole 49 extending from the shaft insertion hole 48 to the air ejection hole 46, and the shaft insertion hole 48 is formed.
A spring accommodating portion 50 is formed on the back surface side of the core. A support shaft which is inserted into a through hole 49 of a holder 45 and a shaft insertion hole 48 of a core 43 on the back surface of the valve body 47 and is supported movably in the axial direction.
51 is provided, and a screw shaft 51a is provided at the tip end of the support shaft 51. A spring washer 52 is fitted on the screw shaft 51a and a nut 53 is screwed. A return spring 54, which is a compression coil spring, is accommodated in the spring accommodating portion 50, and the return spring 54 biases the valve element 47 in the anti-projection direction via the support shaft 51. The core mounting plate 55 has a shaft insertion hole.
An air supply path 56 communicating with 48 is formed.

When the molded product 57 is ejected from the core 43, compressed air is supplied from the air supply passage 56 to the valve body rear surface side of the air ejection hole 46 through the shaft insertion hole 48 and the through hole 49. The compressed air causes the valve body 47 to project against the spring force of the return spring 54 to form a gap between the valve body 47 and the inner surface of the air ejection hole 46, and the air is formed between the molded product 57 and the core 43 through the gap. It will be supplied in the meantime.

[0004]

By the way, when the molded product 57 is detached from the core 43, when the air is supplied between the molded product 57 and the core 43, the valve body 47 moves in the axial direction of the support shaft 51. Vibrates slightly. As a result, the valve body 47 rubs against the holder 45 and wears.Therefore, in order to replace the valve body 47, the spindle 51 is passed through the core 43, and the return spring 54 and the spring washer 52 are inserted from the core back side. Although the nut 53 can be incorporated, in the core 43 having a large size or a long distance to the back surface, the length of the support shaft 51 becomes very long, the support shaft 51 bends, and the valve body 47 and the holder 45. There is a problem in that the resistance due to friction with the inner surface of the air ejection hole 46 becomes partly large and the valve body 47 does not project or the projecting valve body 47 does not return when air is supplied.

Further, since the support shaft 51 is penetrated to the core back surface, the support groove 51 interferes with the cooling groove formed in the core 43 and the sealing O-ring or the bolts for attaching the core 43 to the core mounting plate 55. It is necessary to consider not to do it. Further, there is a problem that machining of the shaft insertion hole 48 is troublesome and assembly is troublesome and complicated. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a mold air jet valve device that solves the above-mentioned various problems.

[0006]

The technical means taken by the present invention to achieve the above-mentioned object is to mount a holder 8 in a mounting hole 6 formed on the inner surface side of a mold 1, and to mount the holder 8 on the holder 8. An air ejection hole 13 having an opening shape is recessed toward the inside of the mold 1, and a valve body 9 for closing an end opening of the air ejection hole 13 is attached to the air ejection hole 13 so as to project from the air ejection hole 13. On the back of valve body 9,
A support shaft 18 having a shaft center in the valve body protruding direction and supported movably in the shaft center direction is provided, and a return spring 24 for urging the valve body 9 in the anti-projection direction is provided. By supplying compressed air to the rear side of the valve body to cause the valve body 9 to project, air is supplied from between the inner surface of the air ejection hole 13 and the valve body 9 to between the mold 1 and the molded product 29. In the air injection valve device of the mold, the female screw portion 26 is formed in the mounting hole 6 and the male screw portion 12 into which the female screw portion 26 is screwed is formed in the holder 8 so that the holder 8 is mounted in the mounting hole 6. The point is that they can be screwed and the return spring 24 is provided between the holder 8 and the support shaft 18.

[0007]

[Operation] The holder 8 of the air injection valve can be screwed into the mounting hole 6 formed in the mold 1, and the return spring 24 is provided between the holder 8 and the support shaft 18, so that the holder 8 The body 9, the support shaft 18 and the return spring 24 are unitized and can be freely attached to and detached from the mounting hole 6, which allows the support shaft 18 to be formed in a short shape and allows the valve body 9 to operate smoothly and to be assembled. It is easy to attach and process, and there is no need to penetrate the support shaft 18 to the rear surface of the mold 1, there is no trouble with cooling grooves, mold mounting bolts, etc.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment, and in FIG.
Reference numeral 1 denotes a mold for injection molding, which is mainly composed of a cabinet 2 having a cavity and a core 3. 4 is a cabinet mounting plate and 5 is a core mounting plate. A mounting hole 6 is formed on the inner surface of the mold 1 in the cabinet 2 and the core 3, and an air jet valve 7 is mounted in the mounting hole 6.

As shown in FIG. 2, the air jet valve 7 is mainly composed of a holder 8 and a valve body 9. The holder 8 is composed of a holder main body 10 having an outer cylindrical shape and a screw shaft 11 protruding from the rear surface of the holder main body 10, and the outer peripheral surface of the screw shaft 11 is a male screw portion 12. An opening-shaped air ejection hole 13 is formed in the holder body 10 toward the inside of the mold 1.
The reference numeral 13 is formed into a conical shape that expands toward the inside of the mold 1. Also, as shown in FIG. 4, the holder 8 is formed with a shaft insertion hole 14 penetrating the holder main body 10 and the screw shaft 11 from the center of the bottom of the air ejection hole 13, and also the holder main body 10 4, a pair of fitting grooves 15 are formed radially outward from the shaft insertion hole 14 at symmetrical positions in the radial direction. The fitting grooves 15 also communicate with the air ejection holes 13. Has been done.

The valve body 9 is formed into a conical shape as a whole, and is taper-fitted to the air ejection hole 13,
It is possible to block 13 and project from the air ejection hole 13. A circumferential groove 16 is formed at a midway portion of the valve body 9 in the axial direction, and at the bottom of the circumferential groove 16, as shown in FIG.
An engagement hole 17 for engaging a tool for rotating 9 is formed. A support shaft 18 having a shaft center in the valve body protruding direction is provided on the back surface of the valve body 9, and the support shaft 18 is inserted into the shaft insertion hole 14 and supported so as to be movable in the shaft center direction. Also, support shaft 12
Is provided with a pair of detent pieces 19 that fit into the fitting grooves 15 of the holder 8 to prevent relative rotation of the valve body 9 and the holder 8 about the axis, that is, the valve body 9 and the holder 8. 8 and 8 rotate together. Further, a pair of air circulation grooves 20 in the axial direction are formed in the support shaft 18 at radially symmetrical positions, the support shaft 18 is projected from the shaft insertion hole 14, and a screw shaft 21 is provided at the protruding end portion. ing. This screw shaft 21 has a spring washer
The nut 23 is fitted and the nut 23 is screwed. A return spring 24, which is a compression coil spring, is interposed between the spring washer 22 and the back surface of the holder 8 to bias the valve body 9 in the anti-projection direction.

The mounting hole 6 is formed in the mold 1 as shown in FIG.
From the inner surface side toward the inner part, a body fitting portion 25 into which the holder body portion 10 is fitted, a female screw portion 26 into which the male screw portion 12 of the holder 8 is screwed, a return spring 24 of the air injection valve 7 and a support. A storage portion 27 in which the shaft 18 and the like are stored is formed in order. Further, an air flow passage 28 formed in the core 3 and the cabinet 2 is communicated with the mounting hole 6, and the air flow passage 28 is connected to an air compressor (not shown). Then, by supplying compressed air to the air flow passage 28, compressed air is supplied to the back surface of the valve body 9 through the housing portion 27 of the mounting hole 6 and the air circulation groove 20, and the valve body 9 is projected. Air is ejected toward the inner surface of the mold 1 through a space between the valve body 9 and the inner surface of the air ejection hole 13.

The holder 8 and the valve body 9 are formed by quenching a special material, have excellent durability, and are formed so that they can be smoothly operated by polishing. In order to mount the air ejection valve 7 having the above structure, the valve body 9 is projected from the air ejection hole 13 and the tool is engaged with the engagement hole 17. Next, the air ejection valve 7 is screwed into the mounting hole 6 by rotating the air ejection valve 7 with a tool and screwing the male screw portion 12 of the holder 8 into the female screw portion 26 of the mounting hole 6. After screwing, the surface of the air ejection valve 7 is cut into a shape which is flush with the inner surface of the cabinet 2 and the inner surface of the core 3 and conforms to the inner surface shape. Also, when removing the air jet valve 7,
Compressed air is supplied to the valve body 9 so that the valve body 9
It suffices to insert an interposition between 9 and the inner surface of the air ejection hole 13 to maintain the protruding state, and then further pull out the valve body 9 to engage the tool.

In order to take out the molded product 29, the core 3 is separated from the cabinet 2 and compressed air is supplied to the air flow passage 28 provided on the cabinet 2 side.
Air is ejected between the molded article 29 and the molded article 29 to eliminate the vacuum state therebetween. As a result, the molded product 29 is separated from the cabinet 2 together with the core 3. Next, compressed air is supplied to the air flow passage 28 provided on the core 3 side to eject air between the core 3 and the molded product 29 to eliminate the vacuum state between them, and at the same time, from the core 3 to the molded product 29. To eject.

FIG. 6 shows another embodiment in which a hexagonal hole 30 is formed from the surface side of the valve body 9 as an engaging means of a tool, and the hexagonal hole 30 is embedded after the air injection valve 7 is mounted. Gold is embedded and is removed when the air jet valve 7 is removed.
In the above configuration, as shown in FIG. 6, the air ejection valve 7
The mounting surface 31 of is inclined with respect to the lateral direction (horizontal direction) of the core 3 and is effective when the air ejection valve 7 is mounted in the direction along the lateral direction of the core 3. Incidentally, reference numeral 32 in the drawing denotes a cooling groove.

FIG. 7 shows an example of attachment of the air ejection valve 7. The air ejection valve 7 is attached to an inclined attachment surface 31 in a direction orthogonal to the attachment surface 31. In each of the above embodiments, the valve body 9 does not rotate, so the air injection valve
Even if the mounting surface of 7 is flat, the air injection valve 7 of the mold 1
There is an advantage that the polishing mark between the mounting surface and the surface of the valve body 9 is not displaced and the molded product 29 is not adversely affected. Also, the holder 8
By completely screwing into the mounting hole 6, the mounting position of the air ejection valve 7 is always fixed, and the air ejection valve 7 is mounted and the surface side of the valve body 9 is processed to match the mounting surface (cutting, polishing) When the air ejection valve 7 is attached and detached after that, there is also an advantage that even if the mounting surface of the air ejection valve 7 is a deformed surface such as a sloped surface or a corrugated surface, a deviation between the surface of the valve body 9 and the mounting surface of the air ejection valve 7 does not occur. Further, the air ejection valve 7 is a standard mass-produced product, has compatibility, and can reduce cost. Further, as the rotation preventing means of the valve body 9, the support shaft 18 and the shaft insertion hole 14 may have a non-circular cross section (for example, a polygonal shape, an oval shape or the like).

[0016]

According to the present invention, the female screw portion 26 is formed in the mounting hole 6 formed in the mold 1 and the female screw portion is formed in the holder.
Form a male screw part 12 to be screwed into 26 and mount the holder 8 in the mounting hole 6
Since the return spring 24 is provided between the holder 8 and the support shaft 18, the holder 8, the valve body 9, the support shaft 18 and the return spring 24 are unitized and can be attached / detached to / from the mounting hole 6. Therefore, regardless of the size and length of the mold 1, the spindle is
18 can be shortened as much as possible, the support shaft bends like the conventional one, and the resistance due to the friction between the valve body and the inner surface of the air ejection hole becomes partly large, which causes a problem that the valve body does not project when air is supplied. Without this, the valve body 9 operates smoothly.

Since the holder 8, the valve body 9, the support shaft 18 and the return spring 24 are assembled as a unit into the mold 1, the assembly,
It is easy to process, etc. Moreover, it is a screw type and can be easily attached and detached. Further, since the support shaft 18 does not penetrate the mold 1 to the back side, there is no trouble with the cooling groove, the O-ring, the mold mounting bolt, etc., and it is easy to set even in a complicated place, and the mounting surface is an inclined surface. Even if there is, it can be mounted at a right angle to the mounting surface, and the degree of freedom of mounting is great.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a main part showing an embodiment.

FIG. 2 is a sectional view of an air ejection valve.

FIG. 3 is a sectional view taken along the line AA of FIG.

FIG. 4 is a cross-sectional view taken along the line BB of FIG. 2B.

FIG. 5 is a cross-sectional view showing a mounting hole.

FIG. 6 is a cross-sectional view of a main part showing another embodiment.

FIG. 7 is a cross-sectional view showing another example of attachment.

FIG. 8 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 Mold 6 Mounting hole 8 Holder 9 Valve body 12 Male screw part 13 Air ejection hole 18 Spindle 24 Return spring 26 Female screw part 29 Molded product

Claims (1)

[Claims] 1. A mounting hole (6) formed on the inner surface side of the mold (1).
Attach the holder (8) to the holder (8), and provide this holder (8) with an air ejection hole (13) with an opening toward the inside of the mold (1). The valve body (9) that closes the opening is attached so that it can project from the air ejection hole (13). A freely supported support shaft (18) is provided, and a return spring (24) for urging the valve body (9) in the anti-projection direction is provided, and the air ejection hole (1
By supplying compressed air to the valve body rear side of (3) and causing the valve body (9) to project, the mold (1) and the molded product are inserted between the inner surface of the air ejection hole (13) and the valve body (9). In a mold air injection valve device configured to supply air between (29) and (29), a female screw part (26) is formed in the mounting hole (6) and a holder is formed.
A male screw part (12) for screwing the female screw part (26) is formed in (8) so that the holder (8) can be screwed into the mounting hole (6), and the return spring (2
An air jet valve device for a die, characterized in that 4) is provided between the holder (8) and the support shaft (18).