JP3317621B2 - Mold using air blow - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding die for releasing a molded product from the die by air blow.

[0002]

2. Description of the Related Art << Definition of Terms >> In this specification, terms are defined as follows. The “annular member” refers to a substantially cylindrical member used by being inserted into a cylindrical hole of the mirror member. “Axial direction” refers to a direction parallel to the central axis of the annular member. “Axial groove” refers to a groove provided in the side surface of the annular member in the axial direction. The “circumferential direction” refers to a circumferential direction of a circle formed by a cross section perpendicular to the central axis of the annular member and a side surface. The “circumferential groove” refers to a groove provided on the side surface of the annular member in the circumferential direction. “Release” refers to releasing a molded product from a mold. “Uneven release” refers to an optical defect caused by release. The “air inlet” refers to the air passage (118) or (11) in FIG.
9) refers to the inner surface side end of the cylindrical member of the mirror member. The term “fitting position setting part” refers to a part for determining the position by fitting the annular member with the inner surface of the cylindrical hole of the mirror member on the side surface where the axial groove is not provided.

[0003] Conventionally, substrates of plastic recording media for optical disks and the like have been formed by injection molding using synthetic resins such as polycarbonate resins, acrylic resins, and polyolefin resins.

FIG. 9 is a cross-sectional view showing the structure of a conventional molding die using air blow. 101 is a fixed mold and 10
Reference numeral 2 denotes a movable mold. The fixed mold 101 and the movable mold 1
02 is closed, and a cavity 103 is formed therebetween. The molten resin flows into the cavity 103 by injection, and a molded product is formed.

In the movable mold 102, a stamper 104 is mounted on a mirror member 107 of the movable mold by a stamper inner periphery press 105 and a stamper outer periphery press 106.
Information to be stamped on the molded product is stamped on the stamper 104. The mirror member 107 of the movable mold is connected to the temperature control channel 10.
8 and is controlled at a constant temperature by water flowing therethrough. The mirror member 107 of the movable mold is screwed with the base 109 of the movable mold, and is fixed to a large plate of the molding machine. The movable mold 102 is moved by applying a force to the large plate, and the fixed mold 1 is moved.
A mold clamping force is generated between the movable mold 01 and the movable mold 102.

At the central axis of the movable mold 102, there are an annular member 110, a cut punch 111, and a protruding pin 112. The cut punch 111 forms an inner hole in the molded product, the annular member 110 pushes the molded product upward as a projecting punch, and the projecting pin 112 removes sprue.

In the fixed mold 101, the fixed mold base 11
3 is fixed to the large plate of the molding machine. A fixed mold mirror member 114 is screwed into the fixed mold base 113. The mirror member 114 of the fixed mold is a member that forms a molded product together with the mirror member 107 of the movable mold. The mirror member 114 of the fixed mold also has a temperature control water channel 115, and is controlled at a constant temperature by water flowing through the water channel.

At the central axis of the fixed mold 101, there are a sprue bush 116 and an annular member 117 serving as an inflow path for the molten resin. The annular member 117 includes a sprue bush 116 as a fixed side bush and a mirror member 11 of a fixed mold.
4 has an insulating effect.

An air passage 118 is provided in the base 113 of the fixed mold.
The air that has passed through the air passage 118 is fitted into a fitting gap 125 between the mirror member 114 of the fixed mold and the annular member 117.
Through the cavity 103. On the other hand, the movable mold base 109 has an air passage 119, and the air that has passed through the air passage 119 is fitted into a fitting gap 124 between the stamper inner peripheral holding member 105 provided on the mirror member 107 of the movable mold and the annular member 110. Through the cavity 103. These air are blown to the molded product when the molded product is peeled from the mold. Thereby, the molded product is released.

The annular member 110 or 117 of FIG.
0 corresponds to the annular members 110 and 117. FIG. 10 shows the structure, and FIG. 11 shows a cross section taken along line XX ′. The air flows into the mold from the direction indicated by arrow P in FIG. The annular members 110 and 117 each have a circumferential groove 120 for turning air in the circumferential direction. Its circumferential groove 12
Following the zero, a plurality of axial grooves 121 for guiding air to the cavity surface have the same cross-sectional shape in parallel to the axial direction and are evenly spaced. Further, following the axial groove 121, there is a circular groove 122 formed around the circumference to disperse air in the circumferential direction of the cylindrical annular member on the cavity side. The air guided to the circumferential groove 122 blows out to the cavity 103 through the fitting gap 124 or 125 between the air blowing portion 123 and the stamper inner circumferential holding member 105 or the mirror member 114 of the fixed mold in FIG. Is done.
The fitting gap is designed to be about 20 μm so that the molten resin does not flow into the fitting gap 124 or 125 from the cavity 103 and air blows out to the cavity 103.

At the same time as air is blown from the fitting gap 124 or 125 onto the molded product, the movable mold 102 moves downward and separates from the fixed mold 101 to be separated. Thereafter, the protruding punch 110 slides upward to push up the molded product, and the molded product is taken out.

[0012]

As described above, FIG. 9 and FIG.
In a molding die using air blow using a conventional annular member described with reference to FIG. 0 and FIG. 11, the amount of air blow is deviated in the circumferential direction (with respect to an angular position around an axis), and the amount of air blow between the molded product and the mold is increased. Demolding is not performed uniformly over the entire surface. For this reason, there has been a problem that uneven release occurs. In particular, in order to transfer high-density information, it is necessary to raise the temperature of the resin more than before, which makes molded products more likely to stick to molds and stampers than before, and this uneven release occurs. It's easy to do. An object of the present invention is to solve the above problems, and an object of the present invention is to provide a molding die using an air blow that can uniformly release a molded product from a die or a stamper.

[0013]

According to the present invention, there is provided a molding die using an air blow, comprising: an annular member having a plurality of axial grooves formed on a side surface; Forming using an air blow in which a fitting gap is formed between the outer peripheral surface of the air blowing portion of the annular member and the inner surface of the cylindrical member of the mirror member or a member in contact with the mirror member by determining the position of the annular member by fitting. A mold, wherein the plurality of axial grooves have different cross-sectional areas in a cross section perpendicular to the axial direction.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to a first aspect of the present invention, there is provided a molding die using an air blow, wherein an annular member provided with a plurality of axial grooves on a side surface has a mirror member or a member inscribed with the mirror member on the side surface (eg, The position of the annular member is determined by fitting the inner surface of the cylindrical hole of the stamper inner peripheral holder) between the outer peripheral surface of the air blowing portion of the annular member and the inner surface of the cylindrical member of the mirror member or a member in contact with the mirror member. a molding die using the resulting allowed upcoming air blowing fitting gap, the
Multiple axial axes differed in cross section perpendicular to the axial direction
It has a cross-sectional area .

According to a second aspect of the present invention, there is provided a molding die using an air blow according to the first aspect, wherein the width of the axial groove is narrow near the air inlet and along the circumference of the annular member. It is characterized by being widely selected as you move away from it.

According to a third aspect of the present invention, there is provided a molding die using an air blow according to the first aspect, wherein the depth of the axial groove is shallow near the air inlet and along the circumference of the annular member. It is characterized by being deeply selected as you move away from it.

According to a fourth aspect of the present invention, there is provided a molding die using an air blow, comprising: an annular member having a plurality of axial grooves formed on a side surface; Forming using an air blow in which a fitting gap is formed between the outer peripheral surface of the air blowing portion of the annular member and the inner surface of the cylindrical hole of the mirror member or a member inscribed with the mirror member in the vicinity of the cavity by determining the position by fitting. A mold, around an axis along a circumference of a side surface of the annular member;
Less than multiple arranged by axial grooves air inlet near the many forms of the distance from the air inlet
It is characterized by having been.

According to a fifth aspect of the present invention, there is provided a molding die using an air blow according to any one of the first to fourth aspects, wherein a fitting gap in the vicinity of the cavity is 10 μm or more and 30 μm or less. .

According to a sixth aspect of the present invention, there is provided a molding die using an air blow, wherein an annular member provided with a plurality of axial grooves on a side surface is provided with a mirror member or a cylindrical inner surface of a member inscribed with the mirror member on the side surface. A molding die using an air blow in which a fitting gap is formed between the outer peripheral surface of the air blowing portion of the annular member and the inner surface of the cylindrical hole of the mirror member or a member inscribed with the mirror member. Further, a plurality of balls are provided in the air blowing portion.

According to a seventh aspect of the present invention, there is provided a molding die using an air blow, wherein an annular member provided with a plurality of axial grooves on a side surface is provided with a mirror member or a cylindrical inner surface of a member inscribed with the mirror member on the side surface. A molding die using an air blow in which a fitting gap is formed between the outer peripheral surface of the air blowing portion of the annular member and the inner surface of the cylindrical hole of the mirror member or a member inscribed with the mirror member. By alternately forming the outer periphery of the air blowout portion with two different outer diameters, the outer circumferential surface of the air blowout portion and the inner surface of the member to which the air blowout portion fits have a wide fitting gap. It is characterized in that narrow portions are formed alternately.

According to the eighth aspect of the present invention, there is provided a molding die using an air blow according to the seventh aspect, wherein the narrow fitting gap is 5 μm or less and the wide fitting gap is 10 μm.
m or more and 30 μm or less.

According to a ninth aspect of the present invention, there is provided a molding die using an air blow, comprising: an annular member having a plurality of axial grooves formed on a side surface; A molding die using an air blow in which a fitting gap is formed between the outer peripheral surface of the air blowing portion of the annular member and the inner surface of the cylindrical hole of the mirror member or a member inscribed with the mirror member. The annular member is a member that slides, and a plurality of balls are provided at the fitting position setting portion.

By using an annular member having a plurality of axial grooves in the air passage and optimizing the width, depth or circumferential interval of the axial grooves, the shaft can be rotated even if the air inlet is located at only one location. It is possible to eliminate non-uniformity of the air flow rate due to the turning angle position, and to blow air into the cavity without bias in the circumferential direction.

Further, by providing a plurality of balls in the air blowing portion, the bias of the fitting gap of the air passage near the cavity is suppressed. By alternately providing a wide fitting space and a narrow fitting space in the air blowing portion, the air is reliably blown out from the wide space, and the deviation of the space can be suppressed in the narrow space.

Further, by providing a plurality of balls in the fitting position setting portion, it is not necessary to widen a gap for preventing damage due to contact wear. Therefore, a change in the fitting gap that occurs each time the member slides is suppressed. Therefore, even if the sliding member is used as the annular member, the air can be blown out to the cavity evenly in the circumferential direction.

By the above means, air is uniformly blown in the circumferential direction in the vicinity of the cavity, so that uneven release can be suppressed.
The yield of molded products is improved.

[0027]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described with reference to FIGS. The configuration of the entire molding die relating to the annular member in FIGS. 1 to 7 is the same as the configuration of the conventional molding die shown in FIG. Therefore, in describing the embodiment of the present invention, portions relating to the entire configuration of the molding die will be described with reference to FIG. Figures 1, 5 and 6
The annular members 110 and 117 of FIG.
In FIG. 117, the annular member 110 of FIG.
It corresponds to 0. FIG. 8 is a diagram showing a configuration in which a part of the embodiment is modified.

<< Embodiment 1 >> The annular members 110 and 117 of the first embodiment of the molding die using the air blow according to the present invention.
1 is shown in FIG. 1, and its cross section AA ′ is shown in FIG. The annular members 110 and 117 form an air passage. Arrow P in FIG. 1 indicates the direction in which air flows into the mold.

A circumferential groove 2 is provided on the side surface of the annular members 110 and 117 so as to face the air inflow port, and serves to rotate the air in the circumferential direction. Subsequent to the circumferential groove 2, a plurality of axial grooves 3 are provided. The plurality of axial grooves 3 guide air to the vicinity of the cavity in the mold. In the present embodiment, the plurality of axial grooves 3 are arranged at equal intervals apart from the air inlet, and the width of the plurality of axial grooves 3 decreases as the distance from the air inlet increases. This is because a plurality of axial grooves 3
This is to prevent the air flowing into the axial groove close to the air inlet from easily flowing into the axial groove, and to equalize the air flow rate in each of the plurality of axial grooves 3. Multiple axial grooves 3
Is followed by a circumferential groove 4, which distributes the air flowing from the plurality of axial grooves 3 in the circumferential direction.

The air blowing portion 5 forms a fitting gap 124 or 125 between itself and the stamper inner peripheral retainer 105 or the fixed die mirror member 114 shown in FIG. The air guided to the circumferential groove 4 through the fitting gap 124 or 125 is blown into the cavity 103. The fitting gap 124 or 125 is designed to be uniform. The fitting gap needs to be wide in order to blow out air and narrow in order to prevent molten resin from entering and forming burrs. As a result of the experiment, 10 μm to 30 μm
m is preferable, and a sufficient air flow rate is obtained at 10 μm or more, and burr is at a level having no practical problem at 30 μm or less.

The portion without the axial groove on the side surface having the plurality of axial grooves 3 is the fitting position locating portion 6. The mating position setting portion 6 is a member to be mated with the annular members 110 and 117,
That is, it is fitted to the stamper inner peripheral holding member 105 or the mirror member 114 of the fixed mold, and the deviation of the fitting gap in the air blowing portion 5 is suppressed. The fitting gap between the fitting position locating portion 6 and the stamper inner peripheral holding member 105 and the fitting gap between the fitting position locating portion 6 and the mirror member 114 of the fixed mold are 5 μm.
It is desirable that:

Experiments have shown that it is desirable that the number of the axial grooves 3 be four or more in order for air to be blown out in the cavity direction without being biased in the circumferential direction.

According to this embodiment, when the molded product is peeled off from the mirror member 114 or the stamper 104 of the fixed mold, the air is uniformly blown in the circumferential direction on the surface of the cavity 103. Mirror member 11 of fixed mold uniformly
4 and the stamper 104. Therefore, uneven release can be suppressed.

As a modified example of a part of the embodiment, when the stamper is mounted on the fixed mold side, the stamper 104, the stamper inner presser 105, and the stamper outer presser 106 of FIG. May be on the side. In this case, the molded product is peeled from the mirror member 107 and the stamper 104 of the movable mold. An embodiment with a configuration such to part deformation shown in FIG.

Embodiment 2 A second embodiment of a molding die using an air blow according to the present invention will be described with reference to FIG.
FIG. 3 shows a cross section AA ′ of the annular members 110 and 117 of FIG. 1 having a plurality of axial grooves 3. The configuration of other portions of the annular members 110 and 117 other than the configuration related to the cross section AA ′ is the same as that of the first embodiment shown in FIG. Annular members 110, 11
7 forms an air passage.

In this embodiment, the depth of the plurality of axial grooves 3 provided in the annular members 110 and 117 is increased as the distance from the air inlet increases. Further, the plurality of axial grooves 3 are arranged at equal intervals except for the air inlet. This is because air is likely to flow in the axial groove near the air inlet and is suppressed, and the air flow rate in each of the plurality of axial grooves 3 is made uniform.

Also in the present embodiment, it has been found through experiments that the number of the plurality of axial grooves 3 is desirably four or more in order for air to be blown out in the cavity direction without being biased in the circumferential direction.

According to the present embodiment, when the molded product is peeled off from the mirror member 114 or the stamper 104 of the fixed mold, air is uniformly blown in the circumferential direction on the surface of the cavity 103. Mirror member 11 of fixed mold uniformly
4 and the stamper 104. Therefore, uneven release can be suppressed.

<< Embodiment 3 >> A third embodiment of a molding die using an air blow according to the present invention will be described with reference to FIG.
FIG. 4 shows a cross section AA ′ of the annular members 110 and 117 of FIG. 1 having a plurality of axial grooves. The configuration of other portions of the annular member 1 other than the configuration related to the cross section AA 'is the same as that of the first embodiment shown in FIG. The annular members 110 and 117 form an air passage.

In this embodiment, a plurality of axial grooves 3 having the same cross-sectional shape are arranged on the side surfaces of the annular members 110 and 117 as the distance from the air inlet increases in the axial direction of the annular members 110 and 117. This is because air tends to flow into the axial groove near the air inlet, which is suppressed, and the air flow guided to the circumferential groove 4 in FIG. 1 is made uniform in the circumferential direction.

Also in this embodiment, it has been found through experiments that the number of the plurality of axial grooves 3 is desirably four or more in order for air to be blown in the cavity direction without being biased in the circumferential direction.

According to the present embodiment, when the molded product is peeled off from the mirror member 114 or the stamper 104 of the fixed mold, air is uniformly blown in the circumferential direction on the surface of the cavity 103.
The molded product is uniformly peeled off from the fixed die mirror member 114 and the stamper 104 in the circumferential direction. Therefore, uneven release can be suppressed.

In the first to third embodiments, the annular member 11
Although the width, depth or number of the plurality of axial grooves 3 arranged on the side surfaces of 0 and 117 are individually shown, it is needless to say that a mixed form of these may be used.

<< Embodiment 4 >> The annular members 110 and 117 of the fourth embodiment of the molding die using the air blow according to the present invention.
Will be described with reference to FIG. This annular member 110,
117 forms an air passage. Arrow P in FIG. 5 indicates the direction in which air flows into the mold.

A circumferential groove 2 is provided on the side surface of the annular members 110 and 117 so as to face the air inflow port, and serves to rotate the air in the circumferential direction. Subsequent to the circumferential groove 2, a plurality of axial grooves 3 are provided. The plurality of axial grooves 3 guide air to the vicinity of the cavity in the mold. In this embodiment, the plurality of axial grooves 3 are arranged at equal intervals apart from the air inlet. A plurality of axial grooves 3 is followed by a circumferential groove 4. The circumferential grooves 4 distribute the air flowing from the plurality of axial grooves 3 in the circumferential direction.

The air blow-out portion 5 forms a fitting gap 124 or 125 between itself and the stamper inner peripheral retainer 105 or the fixed die mirror member 114 in FIG. The air guided to the circumferential groove 4 through the fitting gap 124 or 125 is blown into the cavity 103.

In this embodiment, a plurality of balls 7 such as balls of ball bearings are provided in the air blowing portion 5 in the circumferential direction. As a result, the air outlet fitting gap 12 near the cavity formed between the annular members 110 and 117 and the mating member fitted with the annular members 110 and 117 is formed.
The bias of 4 or 125 is suppressed. In particular, the annular member 1
When the wall thickness of each of the annular members 110 and 117 is small,
17 can be suppressed, and air blowing on the surface of the cavity 103 can be made uniform in the circumferential direction.

Experiments have shown that it is desirable that the number of the axial grooves 3 be four or more in order for air to be blown out in the cavity direction without being biased in the circumferential direction.

According to this embodiment, when the molded product is peeled off from the mirror member 114 or the stamper 104 of the fixed mold, air is uniformly blown in the circumferential direction on the surface of the cavity 103. Mirror member 11 of fixed mold uniformly
4 and the stamper 104. Therefore, uneven release can be suppressed.

As a modified example of a part of the embodiment, when the stamper is mounted on the fixed mold side, the stamper 104, the stamper inner presser 105, and the stamper outer presser 106 in FIG. May be on the side. In this case, the molded product is peeled from the mirror member 107 and the stamper 104 of the movable mold. An embodiment with a configuration such to part deformation shown in FIG.

<Embodiment 5> The annular members 110 and 117 of the fifth embodiment of the molding die using the air blow according to the present invention.
Will be described with reference to FIG. This annular member 110,
117 forms an air passage. The arrow in FIG. 6 indicates the direction in which air flows into the mold.

A circumferential groove 2 is provided on the side surface of the annular members 110 and 117 so as to face the air inflow port, and serves to rotate the air in the circumferential direction. Subsequent to the circumferential groove 2, a plurality of axial grooves 3 are provided. The plurality of axial grooves 3 guide air to the vicinity of the cavity in the mold. In this embodiment, the plurality of axial grooves 3 are arranged at equal intervals apart from the air inlet. A plurality of axial grooves 3 is followed by a circumferential groove 4. The circumferential grooves 4 distribute the air flowing from the plurality of axial grooves 3 in the circumferential direction.

The air blow-out portion 5 forms a fitting gap 124 or 125 between itself and the stamper inner peripheral holding member 105 or the fixed mirror member 114 shown in FIG. The air guided to the circumferential groove 4 through the fitting gap 124 or 125 is blown into the cavity 103.

In this embodiment, the outer periphery of the air blowing portion 5 is alternately formed with two different outer diameters. For this reason,
The outer peripheral surface of the air blowing portion 5 and the air blowing portion 5
Is fitted with the inner surface of the member to be fitted.
A wide part and a narrow part can be alternately formed. Therefore,
The air is reliably blown out from the wide fitting gap, and the bias of the fitting gap between the members is suppressed in a narrow place. In particular, the annular member 1
Even when the wall thickness of each of the annular members 10 and 117 is small,
0, 117 can be suppressed, and air blowing on the cavity surface can be made uniform in the circumferential direction.

The wide fitting gap needs to be wide in order to blow out air, and narrow in order to prevent molten resin from entering and forming burrs. As a result of the experiment, it was found that 10 μm to 30 μm was preferable, and a sufficient air flow rate was obtained at 10 μm or more, and burrs were at a level having no practical problem at 30 μm or less. Further, the narrow fitting gap is desirably 5 μm or less.

Experiments have shown that it is desirable that the number of axial grooves 3 be four or more in order for air to be blown out in the cavity direction without being biased in the circumferential direction.

According to the present embodiment, when the molded product is peeled from the mirror member 114 or the stamper 104 of the fixed mold, air is uniformly blown in the circumferential direction on the surface of the cavity 103.
The molded product is uniformly peeled off from the fixed die mirror member 114 and the stamper 104 in the circumferential direction. Therefore, uneven release can be suppressed.

As a modified example of a part of the embodiment, when the stamper is mounted on the fixed mold side, the stamper 104, the stamper inner presser 105, and the stamper outer presser 106 of FIG. May be on the side. In this case, the molded product is peeled from the mirror member 107 and the stamper 104 of the movable mold. An embodiment with a configuration such to part deformation shown in FIG.

Embodiment 6 An annular member 110 according to a sixth embodiment of a molding die using an air blow according to the present invention will be described with reference to FIG. This annular member 110 forms an air passage. Arrow P in FIG. 7 indicates the direction in which air flows into the mold.

A circumferential groove 2 is provided on the side surface of the annular member 110 so as to face the air inlet, and serves to turn air in the circumferential direction. Subsequent to the circumferential groove 2, a plurality of axial grooves 3 are provided. The plurality of axial grooves 3 guide air to the vicinity of the cavity in the mold. In this embodiment, the plurality of axial grooves 3 are arranged at equal intervals apart from the air inlet. A plurality of axial grooves 3 is followed by a circumferential groove 4. The circumferential grooves 4 distribute the air flowing from the plurality of axial grooves 3 in the circumferential direction.

The air blowing portion 5 forms a fitting gap 124 between the air blowing portion 5 and the stamper inner peripheral holding portion 105 shown in FIG. The air guided to the circumferential groove 4 through the fitting gap 124 is blown into the cavity 103.

A portion of the side surface where the plurality of axial grooves 3 have no groove is a fitting position setting portion 6. The fitting position protruding portion 6 is fitted with a counterpart member fitted with the annular member 110, that is, with the stamper inner peripheral retainer 105, and suppresses deviation of the fitting gap in the air blowing portion 5. It is desirable that the fitting gap between the fitting position setting portion 6 and the stamper inner peripheral holding portion 105 is 5 μm or less.

In the present embodiment, a plurality of balls 8 such as bearing balls are provided in the fitting position determining portion 6. Generally, the fitting gap between the sliding member and the fixed member is to prevent damage due to contact wear of the sliding member,
It is designed to be 20 μm to 30 μm. However, when the annular member 110 slides up and down, if there is such a fitting gap, the annular member 110 swings in the radial direction, and the fitting gap is deviated in the circumferential direction. For this reason, if such a sliding annular member 110 is used as an air passage, the air blown out from the fitting gap between the air blowout portion 5 and the member to which the air blowout portion 5 fits will have an air flow rate in the circumferential direction. Is biased.
However, in this embodiment, the annular member 11 forming the air passage is used.
Since the position of 0 is defined by a plurality of balls 8, the above-mentioned bias is eliminated. For this reason, air blowing on the cavity surface can be made uniform in the circumferential direction.

According to the present embodiment, the molded product is
When peeled from the mold 4, the air is uniformly blown in the circumferential direction on the surface of the cavity, so that the molded product can be uniformly spread in the circumferential direction.
Peel from 4. Accordingly, uneven release can be suppressed.

As a modified example of a part of the embodiment, when the stamper is mounted on the fixed mold side, the stamper 104, the stamper inner presser 105, and the stamper outer presser 106 shown in FIG. May be on the side. In this case, the molded product is peeled from the mirror member 107 of the movable mold. It has a configuration such the part deformed
An example is shown in FIG.

[0066]

The molding die using the air blow according to any one of the first to fifth aspects of the present invention uses an annular member having a plurality of axial grooves for an air passage, and arranges the width, depth or circumferential direction of the axial grooves. By optimizing the interval, even if the air inflow is at one location, unevenness in the flow rate due to the angular position around the axis can be eliminated, and the air can be blown out to the cavity evenly in the circumferential direction.

In the molding die using the air blow according to the sixth aspect of the invention, by providing a plurality of balls in the air blowing portion, the bias of the fitting gap of the air passage near the cavity is suppressed.

According to the molding die using the air blow of the invention described in claims 7 and 8, air is reliably blown out from the wide gap by providing alternately wide and narrow fitting gaps in the air blowing portion. Further, the deviation of the gap can be suppressed in a narrow place.

In the molding die using the air blow according to the ninth aspect of the present invention, it is necessary to provide a plurality of balls at the fitting position locating portion to widen a fitting gap for preventing damage due to contact abrasion. Disappears. Therefore, even if the annular member is slid, the air can be blown out to the cavity without bias in the circumferential direction.

As described above, according to the molding die using the air blow according to the present invention, since air is uniformly blown in the circumferential direction near the cavity, uneven release can be suppressed, and the yield of molded products can be improved.

[Brief description of the drawings]

FIG. 1 shows a first example of a molding die using the air blow of the present invention.
The perspective view which showed the annular member of the Example of FIG.

FIG. 2 shows a first example of a molding die using the air blow of the present invention.
Sectional drawing which showed the axial direction groove | channel of the annular member of Example of FIG.

FIG. 3 shows a second example of a molding die using the air blow of the present invention.
Sectional drawing which showed the axial direction groove | channel of the annular member of Example of FIG.

FIG. 4 shows a third example of a molding die using the air blow of the present invention.
Sectional drawing which showed the axial direction groove | channel of the annular member of Example of FIG.

FIG. 5 shows a fourth example of a molding die using the air blow of the present invention.
The perspective view which showed the annular member of the Example of FIG.

FIG. 6 shows a fifth example of a molding die using the air blow of the present invention.
The perspective view which showed the annular member of the Example of FIG.

FIG. 7 shows a sixth example of a molding die using the air blow of the present invention.
The perspective view which showed the annular member of the Example of FIG.

FIG. 8 is a sectional view showing a partially modified configuration of an embodiment of a molding die using an air blow according to the present invention.

FIG. 9 is a cross-sectional view showing a configuration of a molding die using a conventional air blow.

FIG. 10 is a perspective view showing an annular member of a molding die using a conventional air blow.

FIG. 11 is a sectional view showing an axial groove of an annular member of a molding die using a conventional air blow.

[Explanation of symbols]

 2, 4 Circumferential groove 3 Axial groove 5 Air blowing section 6 Fitting position setting section 7, 8 Ball 101 Fixed mold 102 Movable mold 103 Cavity 104 Stamper 105 Stamper inner circumference holding 106 Stamper outer circumference holding 107 Moving mold Mirror member 108, 115 Temperature control channel 109 Movable mold base 110, 117 Ring member 111 Cut punch 112 Projection pin 113 Fixed mold base 114 Fixed mold mirror member 116 Sprue bush 118, 119 Air passage 124, 125 Fitting Gap

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B29C 33/00-33/76 B29C 45/00-45/84 G11B ^7/ 00-7/30

Claims (9)

(57) [Claims] An annular member having a plurality of axial grooves formed on a side surface thereof is fitted to an inner surface of a cylindrical hole of a mirror member or a member inscribed with the mirror member on the side surface to determine a position of the annular member.
A molding die using an air blow in which a fitting gap is formed between an outer peripheral surface of an air blowing portion of the annular member and an inner surface of a cylindrical member of a mirror member or a member in contact with the mirror member, wherein the plurality of axial grooves are provided. Having different cross-sectional areas in a cross section perpendicular to the axial direction. 2. The molding using an air blow according to claim 1, wherein the width of the axial groove is selected to be narrow near the air inflow port and wide along the circumference of the annular member as the distance from the air groove increases. Mold. 3. The air blow according to claim 1, wherein the depth of the axial groove is shallow near the air inflow port, and is set deeper along the circumference of the annular member and away from the annular member. Molding mold. 4. A position of the annular member is determined by fitting an annular member provided with a plurality of axial grooves on a side surface with an inner surface of a cylindrical hole of a mirror member or a member inscribed with the mirror member on the side surface,
A molding die using an air blow in which a fitting gap is formed between an outer peripheral surface of an air blowing portion of the annular member and a cylindrical member inner surface of a mirror member or a member inscribed with the mirror member . Multiple arrangements around the axis along the circumference
Set by axial grooves is small in an air inlet near the d
(A) A molding die using air blow, which is formed as the distance from the inflow port increases. 5. The fitting gap near the cavity is 10 μm.
The molding die using an air blow according to any one of claims 1 to 4, wherein the thickness is not less than 30 µm. 6. A position of the annular member is determined by fitting an annular member provided with a plurality of axial grooves on the side surface with an inner surface of a cylindrical hole of a mirror member or a member inscribed with the mirror member on the side surface,
A molding die using an air blow in which a fitting gap is formed between an outer peripheral surface of an air blowing portion of the annular member and an inner surface of a cylindrical hole of a mirror member or a member inscribed with the mirror member. A molding die using air blow, characterized by having a ball. 7. A position of the annular member is determined by fitting an annular member provided with a plurality of axial grooves on the side surface with a mirror member or a cylindrical inner surface of a member inscribed with the mirror member on the side surface,
A molding die using an air blow having a fitting gap formed between an outer peripheral surface of an air blowing portion of the annular member and an inner surface of a cylindrical member of a mirror member or a member inscribed with the mirror member. By alternately forming two different outer diameters, a wide portion and a narrow portion of the fitting gap are alternately formed on the outer peripheral surface of the air blowing portion and the inner surface of the member to which the air blowing portion fits. A molding die using an air blow. 8. The molding die according to claim 7, wherein the narrow fitting gap is 5 μm or less and the wide fitting gap is 10 μm or more and 30 μm or less. 9. The position of the annular member is determined by fitting an annular member provided with a plurality of axial grooves on the side surface with an inner surface of a cylindrical hole of a mirror member or a member inscribed with the mirror member on the side surface,
A molding die using an air blow in which a fitting gap is formed between an outer peripheral surface of an air blowing portion of the annular member and an inner surface of a cylindrical member of a mirror member or a member in contact with the mirror member, wherein the annular member slides. A molding die using an air blow, wherein the molding die is a member, and a plurality of balls are provided at a fitting position setting portion.