JPH06721U - Injection mold - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an injection molding die provided with a stamper holder that requires a short time for loading and unloading and does not cause misalignment with a stationary sleeve. A magnetizing portion 74 having a smooth flat end surface 73 is provided at an end portion of a stamper holder 47, and a smooth flat stamper holder is provided on a flange portion 91 of a stationary sleeve 51 fitted in the stamper holder 47. Abutment surface 93
And the ferrite magnets 95 were embedded at equal intervals along the virtual circumference. The stamper holder 47 moves the stationary sleeve 5 by the magnetic force of the ferrite magnet 95.
Since it adheres to 1, it can be attached with one touch. Further, since the ferrite magnets 95 are arranged without any bias and the contact surfaces between them are smooth, the stamper holder 47 and the stationary sleeve 51 are not eccentric.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an injection molding die used by being assembled in a disk injection molding machine when a disk such as a laser disk or a compact disk is injection molded, and more particularly to a structure of a stamper holder mounting portion.

[0002]

[Prior art]

 2. Description of the Related Art Conventionally, various injection molding dies used by being assembled in a disk injection molding machine for molding a laser disk, a compact disk, etc. are known. The information area of the disc molded by using this injection molding die has unevenness corresponding to the information area, and is formed by transferring the unevenness of the stamper attached to the mirror surface plate of the injection molding die. .

As shown in FIG. 6, the stamper 300 is attached to the mirror surface plate 308 by holding the peripheral edge of a center hole 302 formed in the center of the stamper 300 by a holding portion 306 of a stamper holder 304. The stamper holder 304 is attached to the fixed mold 310 by screwing a male screw portion 312a formed on the end portion 312 on the side opposite to the holding portion 306 and a female screw portion 314a provided on the guide ring 314. Has been done. The guide ring 314 is provided with a hypoid gear 314b that meshes with a gear 316a formed at the tip of the guide ring turning 316. Therefore, when the guide ring 316 is rotated by the handle 316b, the guide ring 314 rotates along the circumferential direction of the stamper holder 304 according to the direction of the rotation. Depending on the rotating direction of the guide ring 314, the male screw portion 312a of the stamper holder 304 and the female screw portion 314a of the guide ring 314 are screwed or loosened. When the male screw portion 312a and the female screw portion 314a are tightened, the stamper holder 304 moves leftward in the drawing, and in the opposite case, moves rightward in the drawing.

[0004]

Therefore, the mounting / detaching of the stamper holder 304 to / from the fixed mold 310 accompanying the mounting / detaching of the stamper 300 to / from the mirror surface plate 308 is performed through the guide ring 314 rotated by the guide ring rotation 316. However, if the male screw portion 312a and the female screw portion 314a are not screwed together accurately, they may be galled, which has been a problem. Further, in the above-described method, it takes a long time to mount the stamper holder 304, that is, the stamper 300, and when mounting the stamper 300, foreign matter such as dust enters between the stamper 300 and the mirror surface plate 308, which causes a stamper failure. Was sometimes.

Further, between the stamper holder 304 and the stationary sleeve 318 fitted inside the stamper holder 304, an air passage serving as a passage for the pressurized air discharged for promptly releasing the molded disc from the mold. 320 and a discharge port 322 are provided. However, when the stamper holder 304 is mounted by the above-described method, the stamper holder 304 and the stationary sleeve 318 may be misaligned, and the air passage 320 and the discharge port 322 may be biased. In such a case, the discharge of the pressurized air is unevenly distributed, which may cause problems such as uneven release of the molded disc.

[0006] Therefore, an object of the present invention is to provide an injection molding die provided with a stamper holder that requires a short time for loading and unloading and does not cause misalignment with a stationary sleeve.

[0007]

[Means for Solving the Problems]

 In order to achieve this object, the present invention has the following configurations. That is, the injection mold of the present proposal consists of a fixed mold fixed to the fixed plate of the injection molding machine and a movable mold fixed to the movable plate, and both molds are closed. A stationary sleeve for forming a disk-shaped cavity between the joint surfaces when the stationary mold is opened, and a stationary sleeve which is opened in the center of the mirror surface of the fixed mold or the movable mold and is inserted into the mold; An injection molding die including a stamper holder that is fitted onto a stationary sleeve, has a holding portion that is concentric with the stationary sleeve and that opens to the mirror surface plate, and that holds a peripheral edge of a center hole of a stamper attached to the mirror surface plate. A magnetizing part formed at an end of the stamper holder opposite to the holding part; a magnet installed at a position corresponding to the magnetizing part of the stationary sleeve; Characterized by providing a stamper holder moving means for reciprocating along the da the axial direction of the stationery sleeve.

[0008]

[Action]

 In the injection molding die having the above structure, the fixed mold and the movable mold are fixed to the fixed plate and the movable plate of the injection molding machine, respectively, prior to the injection molding. Furthermore, the stamper is attached to either the fixed or movable die via the stamper holder.

This stamper holder is provided with a holding portion that holds the peripheral edge of the center hole of the stamper, and a magnetized portion that is formed at the opposite end. Further, the stationary sleeve into which the stamper holder is fitted is provided with a magnet at a position corresponding to the magnetized portion of the stamper holder. For this reason, after the stamper holder has been fitted into the stationary sleeve, the stamper holder is moved along the axial direction of the stationary sleeve by the stamper holder moving means and brought closer to the magnet. It is fixed to the stationary sleeve by the magnetic force generated between the stationary sleeve and the stationary sleeve. When the stamper holder is attached to the stationary sleeve by magnetic force, the holding portion presses the peripheral edge of the stamper center hole against the mirror surface plate. As a result, the stamper is sandwiched between the holding portion and the mirror surface plate and attached to the mirror surface plate.

Since the stamper holder is attached and fixed to the stationary sleeve by magnetic force, the time required for mounting the stamper holder is extremely short. Therefore, foreign matter such as dust can be prevented from entering between the stamper and the mirror surface plate, and a stamper failure due to the foreign matter entering between the stamper and the mirror surface plate can be prevented.

Further, since the magnet is provided at the position corresponding to the magnetized portion, the sticking of the stamper holder to the stationary sleeve is not biased. Therefore, the air passage formed between the stamper holder and the stationary sleeve and the discharge port are not biased, so that the air is uniformly discharged from the discharge port. Therefore, problems such as uneven release of the molded disk can be prevented.

Further, when removing the stamper from the mirror surface plate, the stamper holder moving means moves the stamper holder along the axial direction of the stationary sleeve in the direction of separating from the magnet. The stamper holder is disengaged from the magnet, that is, the stationary sleeve, and the holding portion also releases the force pressing the stamper against the mirror surface plate, so that the stamper is separated from the mirror surface plate.

Since the mounting / dismounting is performed via the magnetic force, the mounting / dismounting of the stamper holder can be performed in an extremely short time.

[0014]

【Example】

 Next, in order to further clarify the present invention, a preferred embodiment will be described with reference to the drawings. As shown in FIG. 1, the injection mold 1 of this embodiment includes a fixed plate 7 fixedly fastened to a plurality of stays 3 with nuts 5, and a movable plate attached slidably along the stays 3. And an injection molding machine (not shown).

First, the structure on the stationary platen 7 side will be described. A fixed member 11 connected to the fixed plate 7, fixed side mirror surface plate 13 connected to the fixed member 11 and a fixed side locating block arranged outside the fixed side mirror surface plate 13 are fixed to the fixed plate 7 by bolts (not shown). A fixed mold 17 consisting of 15 is attached.

The surface of the fixed-side mirror surface plate 13 opposite to the fixed member 11 is a cavity surface 13a. A cooling groove 13b is provided in the fixed-side mirror surface plate 13 so that the fixed-side mirror surface plate 13 can be cooled by supplying a coolant. A guide bushing 19 that is open at the center of the fixed-side mirror surface plate 13 is fitted to the fixed-side mirror surface plate 13. The tip end surface of the guide bushing 19 is located almost flush with the cavity surface 13a. A sprue bushing 21 is fitted in the guide bushing 19 and fitted in the fixing member 11. An injection port 23 is provided along the central axis of the sprue bushing 21 to serve as a passage for the injected molten resin. The sprue bushing 21 is concentric with the disk center of the fixed-side mirror surface disk 13, and the central axes of both are common.

The front end of the sprue bushing 21 is at a position slightly retracted from the tip end surface of the guide bushing 19. A nozzle contact surface 29 is formed at the rear end of the sprue bushing 21. An injection nozzle (not shown) for injecting and supplying the molten resin is arranged behind the nozzle contact surface 29 so that the molten resin can be injected into the injection molding die 1.

Next, the structure on the movable platen 9 side will be described. A first movable member 31 connected to the movable plate 9, a second movable member 33 connected to the first movable member 31, and a third movable member connected to the second movable member are fixed to the movable plate 9 by bolts (not shown). A movable die 41, which is composed of a member 35, a movable side mirror surface plate 37 connected to the third movable member 35, and a movable side locating block 39 arranged outside the movable side mirror surface plate 37, is attached.

The movable side mirror surface disk 37 is arranged so that the disk center axis is common to the fixed side mirror surface disk 13. The surface of the movable mirror surface plate 37 facing the fixed mirror surface plate 13 is a cavity surface 37a. Further, the movable mirror surface plate 37 is provided with a cooling groove 37b so that the refrigerant can be supplied to cool the movable mirror surface plate 37.

Further, an outer peripheral ring 45, which holds the outer edge portion of the stamper 43 that forms unevenness on the information surface of the disk mounted and molded on the cavity surface 37 a, is installed around the movable side mirror surface plate 37. There is. Further, a cylindrical stamper holder 47 which is fitted to the movable side mirror surface plate 37 and the third movable member 35 and holds the inner edge of the stamper 43 is provided. As a result, the stamper 43 is attached to the cavity surface 37a of the movable side mirror surface plate 37 while holding the inner and outer edges thereof. Therefore, the cavity 49 formed when the injection molding die 1 is closed is precisely the stamper attached to the cavity surface 13a of the fixed-side mirror surface plate 13 and the cavity surface 37a of the movable-side mirror surface plate 37. And 43.

A stationary sleeve 51, which is inserted into the third movable member 35 and the movable side mirror surface plate 37, is fitted into the stamper holder 47. This stationary sleeve 51 is fixed coaxially with the disk center of the movable side mirror surface disk 37, and has a core-retaining function for parts to be fitted in or out of the stationery sleeve 51.

A cylindrical ejector sleeve 53 is slidably inserted in the stationary sleeve 51 along the axial direction. At the rear end of the ejector sleeve 53, a flange portion 55 accommodated in the space formed in the second movable member 33 is provided. The tip of a pin 57 that is reciprocally driven by a hydraulic cylinder (not shown) is in contact with the flange 55. Therefore, when the pin 57 is driven forward, the ejector sleeve 53 is moved forward. The front end of the ejector sleeve 53 is located substantially on the same plane as the cavity surface 37a of the movable side mirror surface plate 37 when the pin 57 is not advanced, and when the pin 57 is driven and moved forward, the tip end of the ejector sleeve 53 is It can project from the surface 37a.

A tubular mail cutter 61 having an outer diameter corresponding to the inner diameter of the center hole of the molded disk, which is driven forward by a pin 59 that is reciprocally driven by a hydraulic cylinder (not shown), is inserted into the ejector sleeve 53. is doing. A sprue pin 65, which is driven forward by a pin 63 that is reciprocally driven by a hydraulic cylinder (not shown), is slidably inserted into the mail cutter 61.

On the other hand, a stamper holder moving mechanism 67 as a stamper holder moving means of the present invention is inserted through the third movable member 35 along a direction orthogonal to the axial direction of the stamper holder 47. Hereinafter, the stamper holder 47, the stationary sleeve 51, and the stamper holder moving mechanism 67 will be described in detail with reference to FIG.

The stamper holder 47 is made of martensitic stainless steel having magnetism. From the vicinity of the center of the stamper holder 47 to the right end portion in the drawing, the outer diameter gradually increases and becomes tapered. An annular holding portion 71 is provided at this end portion so as to project from the end surface. The holding portion 71 is provided with an outwardly projecting portion 71a for sandwiching the stamper 43 with the cavity surface 37a of the movable side mirror surface plate 37. The other end of the stamper holder 47 is a magnetized portion 74 having a smooth flat end surface 73. Further, the stamper holder 47 is provided with a groove 75 that goes around the outer circumference slightly toward the center from the end surface 73 provided on the magnetized portion 74.

A protrusion 77 provided at the tip of the stamper holder moving mechanism 67 is engaged with the groove 75. The protrusion 77 has a cylindrical shape slightly longer than the depth of the groove 75, and the outer diameter thereof is substantially the same as the width of the groove 75. The protrusion 77 is connected to the shaft 79 of the stamper holder moving mechanism 67. As shown in FIG. 5, the outer diameter of the shaft 79 is twice the outer diameter of the protrusion 77, and the central axis of the protrusion 77 is located at a distance of 1/2 radius of the shaft 79 from the central axis of the shaft 79.

The end of the shaft 79 opposite to the protrusion 77 is connected to the disc portion 83 via a neck 81 having a small diameter. A handle 85 is attached to the disc portion 83, and the disc portion 83, the neck 81, and the shaft 79 can be rotated in the circumferential direction via the handle 85.

A spring 87 that urges the stamper holder moving mechanism 67 in a direction toward the stamper holder 47 is provided around the neck 81 between the third movable member 35 and the neck 81. Further, a perforated lid metal fitting 89 is attached to the third movable member 35 to prevent the spring 87 from coming off and to keep the stamper holder moving mechanism 67 in an appropriate position, and the neck 81 of the lid metal fitting 89. The hole 89a is inserted.

As shown in FIGS. 2 and 5, the stationary sleeve 51 fitted in the stamper holder 47 includes a flange portion 91 formed in two stages, and an end face provided on the magnetized portion 74 of the stamper holder 47. A smooth planar stamper holder contact surface 93 is provided at a position facing 73. Four flanged ferrite magnets 95 are embedded in the flange portion 91 at equal intervals along the virtual circumference. One end of the ferrite magnet 95 is exposed at the stamper holder contact surface 93 at a position corresponding to the end surface 73 provided on the magnetized portion 74 of the stamper holder 47, and is actually the stamper holder contact surface 93. It forms a smooth continuous plane. Therefore, the stamper holder 47 is attached to the stationary sleeve 51 by the magnetic force of the ferrite magnet 95.

Next, a case where the stamper 43 is attached to and detached from the injection molding die 1 via the stamper holder 47 will be described with reference to FIGS. 2 to 5. First, as shown in FIG. 3, after the stamper 43 is aligned and brought into contact with the cavity surface 37a of the movable side mirror surface plate 37, the stamper holder 47 is externally fitted to the stationary sleeve 51 from the direction of the arrow X. Let me insert it. At this time, the stamper holder moving mechanism 67 is pulled up in the arrow Y direction. Then, the stamper holder moving mechanism 67 is rotated in the direction of arrow U or arrow V, and the projection 77 is placed in opposition to the groove 75 of the stamper holder 47 [see FIG. 5 (b)]. The relative positioning of the projection 77 and the groove 75 is easy if, for example, a disc portion 83 of the stamper holder moving mechanism 67 is marked. After the relative position between the projection 77 and the groove 75 is appropriately determined, the force that has lifted the stamper holder moving mechanism 67 is released, and the urging force of the spring 87 causes the stamper holder moving mechanism 67 to move in the direction opposite to the arrow Y. And the projection 77 is engaged with the groove 75. This state is shown in FIG.

Subsequently, when the stamper holder moving mechanism 67 is rotated in the arrow U or arrow V direction, the stamper holder 47 further moves in the arrow X direction and comes into contact with the stationery sleeve 51. The stamper holder 47 is brought into close contact with the stationary sleeve 51 by the magnetic force of the ferrite magnet 95 embedded in the stationary sleeve 51 [see FIGS. 2 and 5 (a)]. The stamper holder 47 sandwiches the stamper 43 between the stamper holder 47 and the cavity surface 37a of the movable side mirror surface plate 37 at the projecting portion 71a provided in the holding portion 71. As a result, the stamper 43 is attached to the cavity surface 37a.

The stamper holder 47 is fitted onto the stationary sleeve 51, moved by the stamper holder moving mechanism 67 in the direction of the arrow X, and the stamper holder 47 is attached to the stationary sleeve 51 by the magnetic force of the ferrite magnet 95. 47 is attached, that is, the stamper 43 is attached. Therefore, the time required for mounting the stamper 43 is short, and foreign matter such as dust is prevented from entering between the stamper 43 and the movable side mirror surface plate 37, which causes the stamper failure.

Since both the end surface 73 provided on the magnetized portion 74 of the stamper holder 47 and the stamper holder contact surface 93 of the stationary sleeve 51 are smooth flat surfaces, they are in close contact with each other. Moreover, one end of the ferrite magnet 95 is exposed at a position corresponding to the end surface 73 of the magnetized portion 74 of the stamper holder 47, and four ferrite magnets are embedded at equal intervals along the virtual circumference. The holder contact surface 93 is evenly contacted and adhered. Therefore, no misalignment occurs between the stamper holder 47 and the stationary sleeve 51. Therefore, even if a passage and an outlet for the pressurized air to be released for the release of the disc are provided between the stamper holder 47 and the stationary sleeve 51, the passage and the outlet for the pressurized air are biased. Does not occur. Therefore, problems such as uneven release of the disc due to uneven discharge of the pressurized air can be prevented.

When removing the stamper holder 47, the stamper holder moving mechanism 67 may be operated in the reverse manner. That is, from the state shown in FIGS. 2 and 5A, the stamper holder moving mechanism 67 is rotated along the arrow U or arrow V direction. Then, the stamper holder 47 is separated from the stationery sleeve 51 against the magnetic force of the ferrite magnet 95, and the state shown in FIGS. 4 and 5B is obtained. Furthermore, when the stamper holder moving mechanism 67 is pulled up in the direction of the arrow Y, the state shown in FIG. 3 is obtained. In this state, when the stamper holder 47 is pulled out in the direction opposite to the arrow X, the stamper holder 47 is detached from the stationary sleeve 51 and detached from the movable mold 41.

In the present embodiment, the material of the stamper holder 47 is martensite stainless steel, but the material of the stamper holder 47 is not limited to this, and iron, steel, iron alloy, Any material having magnetism such as nickel alloy may be used. Further, it is not necessary that the entire stamper holder 47 is made of a magnetized material, and it suffices if only the end portion of the stationery sleeve 51 on the flange portion 91 side is made of a magnetized portion. Further, although the ferrite magnet 95 is used, the material of the magnet is not limited to this. The magnets may be arranged without any deviation along the virtual circumference centered on the axis of the stationary sleeve, and are not limited to the four positions shown in this embodiment. The shape of the magnet is not limited to the same, and for example, one ring-shaped magnet may be arranged along the virtual circumference.

In the present embodiment, the stamper holder is installed on the movable mold as a structure for mounting the stamper on the movable mold. However, the stamper holder and the stationary sleeve are provided on the fixed mold and the stamper is mounted on the fixed mold. It is also possible to adopt a configuration that does. Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments and can be implemented in various modes without departing from the scope of the invention. Further, in the present invention, the stamper holder is provided with the magnetized portion and the magnet is provided on the stationary sleeve.However, the magnet is provided on the stamper holder symmetrically with this, and the magnetized portion is provided on the stationary sleeve. It goes without saying that the same effects as those of the present invention can be obtained even in the configuration.

[0037]

[Effect of device]

 As described above, according to the injection molding die of the present invention, the time required for mounting / removing the stamper holder is short, and the stamper holder and the stationary sleeve do not become misaligned.

[Brief description of drawings]

FIG. 1 is a sectional view of an injection mold of an example.

FIG. 2 is a partial cross-sectional view around a stamper holder of the injection molding die of the embodiment.

FIG. 3 is an explanatory diagram of how a stamper holder is attached to and detached from an injection mold of an embodiment.

FIG. 4 is an explanatory diagram of how the stamper holder is attached to and detached from the injection mold of the embodiment.

5A and 5B are explanatory views of relative positions of the stamper holder and the stationary sleeve when the stamper holder is attached to and detached from the injection molding die according to the embodiment, and FIG.
-A arrow view, FIG.5 (b) is a BB arrow view in FIG.

FIG. 6 is a partial cross-sectional view around a stamper holder in a conventional injection molding die.

[Explanation of symbols]

1 ... Injection mold, 7 ... Fixed plate, 9 ... Movable plate, 13 ... Fixed side mirror surface plate, 13a ... Cavity surface, 17 ... Fixed mold, 37 ...・ Movable mirror surface panel, 3
7a ... cavity surface, 41 ... movable mold, 43 ...
..Stampers, 47 ... Stamper holders, 49 ...
Cavity, 51 ... Stationary sleeve, 67
... Stamper holder moving mechanism, 71 ... Holding part, 7
4 ... Magnetizing part, 95 ... Ferrite magnet, 300 ...
..Stampers, 304 ... Stamper holders, 306 ..
..Holding part, 308 ... Mirror surface plate, 312a ... Male screw part, 314 ... Guide ring, 314a ... Female screw part, 318 ... Stationary sleeve, 320.
..Air passages, 322 ... Discharge ports

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location // B29L 11:00 4F

Claims (1)

[Scope of utility model registration request] 1. An injection molding machine comprising a fixed mold fixed to a fixed platen and a movable platen fixed to a movable platen, wherein the two molds are between the joint surfaces when the both molds are closed. The stationary sleeve is provided with a mirror surface disk that forms a disk-shaped cavity, and a stationary sleeve that is opened in the center of the mirror surface disk of the fixed mold or the movable mold and is inserted into the mold, and the stationary sleeve is externally fitted to the stationary sleeve. An injection-molding die, comprising: a sleeve concentric with a holding portion that opens to the mirror surface plate, and a stamper holder that holds a peripheral edge of a center hole of a stamper attached to the mirror surface plate, wherein the holding portion of the stamper holder is provided. A magnetizing part formed at an end opposite to the magnetizing part, a magnet installed at a position corresponding to the magnetizing part of the stationary sleeve, and the stamper holder to the stationary part. An injection molding die, comprising: a stamper holder moving means for reciprocating along the axial direction of the tube.