JP2000053429A - Glass forming machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to shorten a forming cycle, to miniaturize a heating device and to reduce the cost of a metal mold device. SOLUTION: This glass forming machine has a first core, a second core which is disposed to face this first core and is freely movably disposed, a drum mold which encloses the first and second cores, the heating device 40 which heats the first and second cores and a pressurizing device which exerts pressurizing force on the second core. The heating device 40 has an annular heat source which encloses the metal mold device 10 and an optical reflection mirror 42 which is disposed around this heat source and irradiates the metal mold device 10 with prescribed irradiation patterns. In such a case, the metal mold device 10 is heated mainly in the central portion in the axial direction and, therefore, the temp in the central portion in the axial direction of the metal mold device 10 may be made sufficiently high.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass forming machine.

[0002]

2. Description of the Related Art Conventionally, in a glass forming machine for forming a glass lens as a molded product, a mold apparatus including an upper mold core and a lower mold core is provided, and an upper mold core and a lower mold core are provided. A preform, which is a prototype of a lens, is set between the preform and the pressurizing mechanism, and the mold apparatus is heated.

As a method for heating the mold apparatus, a hot plate heating method (see Japanese Patent Application Laid-Open No. 4-164826) or a high-frequency induction heating method (Japanese Patent Application Laid-Open No. 63-17022)
No. 8) is used. In the hot plate heating method, a hot plate in which a plurality of heaters are embedded approaches or comes into contact with a mold device. And
When the hot plate is brought close to the mold device, the mold device is heated by convection and radiation. When the hot plate is brought into contact with the mold device, the mold device is heated by convection, radiation and contact heat transfer. Is done.

In the high frequency induction heating method, a high frequency is generated by a heating device, and the high frequency is used for induction heating.

[0005]

However, in the above-mentioned conventional glass forming machine, if the mold apparatus is to be heated by the hot plate heating method, the heating rate cannot be increased because the heating efficiency is low. The molding cycle is lengthened accordingly. Further, in the high-frequency induction heating method, although the heating efficiency is high, a large-sized high-frequency power source is required to increase the output of the induction heating, and the heating device is accordingly enlarged. Further, since a ceramic material cannot be used as a material of the mold device, the cost of the mold device is increased accordingly.

The present invention solves the above-mentioned problems of the conventional glass forming machine, and can shorten the forming cycle, reduce the size of the heating device, and reduce the cost of the mold device. It is an object of the present invention to provide a glass forming machine capable of performing the above.

[0007]

For this purpose, in a glass forming machine according to the present invention, a first core and a second core movably disposed opposite to the first core are provided; It has a body mold surrounding the first and second cores, a heating device for heating the first and second cores, and a pressurizing device for applying pressure to the second cores.

The heating device includes a ring-shaped heat source surrounding the mold device, and an optical reflection mirror disposed around the heat source and irradiating the mold device with a predetermined irradiation pattern. In another glass forming machine of the present invention,
Further, the heating device includes a transparent quartz tube that transmits infrared rays in a wavelength range of a halogen lamp between the heating device and the mold device.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 3 is a conceptual diagram of a glass forming machine according to the embodiment of the present invention, and FIG. 4 is a conceptual diagram of a mold device according to the embodiment of the present invention. In the figure, reference numeral 10 denotes a mold apparatus, which is placed on a mold base 31 serving as an apparatus main body of a glass forming machine, and has a lower mold core 11 as a first core, and a lower mold core. The upper core 12 surrounds the lower core 11 and the upper core 12 as a second core which is disposed to be opposed to the upper core 11 and movably in the vertical direction. A sleeve-shaped body 13 that guides 12 is provided.

The lower mold core 11 is provided with a mold base 31.
A large diameter head portion 11a disposed in contact with the head portion 11a and a small diameter shaft portion 11b formed integrally with the head portion 11a, and a molding surface S1 is formed on the upper end of the shaft portion 11b. The upper core 12 has a large diameter head 12.
a, and a small diameter shaft portion 12b formed integrally with the head portion 12a, and a molding surface S2 is formed at a lower end of the shaft portion 12b. The molding surfaces S1 and S2 are formed corresponding to the shape of a glass lens (not shown) as a molded product. Therefore, the preform 15 is set on the lower mold core 11, the mold apparatus 10 is heated to a predetermined temperature in the heating step, and the mold apparatus 10 is applied to the mold apparatus 10 in the direction of arrow A shown in FIG. When pressure is applied, the preform 15 is deformed to conform to the molding surfaces S1, S2, and the lens is molded.

When the lower die core 11 and the upper die core 12 are inserted facing each other, the inner peripheral surface of the body die 13 is
The shaft portions 11b and 12b are processed so that alignment can be performed with predetermined accuracy by fitting (fitting). The glass forming machine applies a pressing force to the mold clamping device 50 and the mold device 10 that press the body mold 13 against the mold platform 31 to improve the contact state between the mold device 10 and the mold platform 31. And a pressing device 60 for pressing the upper mold core 12 downward to deform the preform 15, and a heating device 40 for heating the mold device 10 to a predetermined temperature and maintaining the temperature.

The heating device 40 comprises an annular upper plate 35, a cylindrical side plate 36, a disk-shaped lower plate 37, and an annular casing 39 composed of a cylindrical transparent quartz tube 32. The heating element chamber 4 is provided in the casing 39.
3 is formed. Further, a halogen lamp 41 as a ring-shaped heat source is provided in the heating element chamber 43, and an optical reflection mirror 42 is provided around the halogen lamp 41. The mold apparatus 10 is provided in the transparent quartz tube 32.

Therefore, when the halogen lamp 41 is turned on, the light of the halogen lamp 41, that is, infrared rays, is irradiated on the mold apparatus 10 through the transparent quartz tube 32 and is reflected by the optical reflection mirror 42. After the light is collected and condensed, the mold device 10 is irradiated through the transparent quartz tube 32. Incidentally, the optical reflection mirror 42 has such a shape as to reflect the infrared rays of the halogen lamp 41 and mainly irradiate the central part of the mold apparatus 10. As a result, the central portion of the mold apparatus 10 is mainly heated, and the preform 15 is efficiently heated.

Then, the transparent quartz tube 32 is
0 while maintaining the airtightness of the halogen lamp 41
Mold apparatus 10 that transmits almost all infrared rays in the
Heat effectively. Also, a predetermined portion of the mold apparatus 10, for example,
For example, the thermocouple t _HAre arranged and not shown.
The control device is the thermocouple t_HTemperature detected by
The temperature of the mold apparatus 10 is controlled based on.

The mold clamping device 50 has a lower end opposed to the body mold 13, and has a mold clamping rod 51 movably arranged in a vertical direction, and is attached to an upper end of the mold clamping rod 51. And a plurality of pneumatic clamping cylinders 53 disposed between the upper plate 35 and the clamping plate 52. The mold clamping cylinder 53 includes a cylinder portion 5 fixed to the upper plate 35.
3a and a rod part 5 fixed to the mold clamping plate 52
3b and is driven by compressed air. Therefore, in each of the cylinder portions 53a, the compressed air source SU1 is connected to the head-side air chamber 53c via the air flow path L1, and the servo valve 6 is connected to the rod-side air chamber 53d via the air flow path L2.
4 are respectively connected. And the servo valve 64 is
It is connected to the compressed air source SU2 via the air flow path L3 and communicates with the atmosphere via the air flow path L4. The air flow path L2 is provided with a pressure detector Pr1 for detecting the pressure of the compressed air.

The pressurizing device 60 is disposed in the mold clamping rod 51 with its lower end facing the upper die core 12, and is provided with a pressurizing rod 61 movably arranged in the vertical direction.
A pressure plate 62 attached to the upper end of the pressure rod 61 and a plurality of pneumatic pressure cylinders 63 disposed between the mold clamping plate 52 and the pressure plate 62 are provided. The pressurizing cylinder 63 is provided with the mold clamping plate 5.
2 and a rod 63b fixed to the pressure plate 62, and are driven by compressed air. Therefore, each of the cylinder portions 63
In a, the compressed air source SU3 is connected to the head-side air chamber 63c via the air flow path L5, and the servo valve 65 is connected to the rod-side air chamber 63d via the air flow path L6.
The servo valve 65 is connected to the compressed air source SU4 via the air flow path L7 and communicates with the atmosphere via the air flow path L8. The air flow path L6 is provided with a pressure detector Pr2 for detecting the pressure of the compressed air.

A first bellows 33 is disposed between the upper plate 35 and the mold clamping plate 52 so as to surround the mold clamping rod 51, and the first bellows 33 is disposed between the mold clamping plate 52 and the pressure plate 62. Then, surrounding the pressure rod 61, the second
A bellows 34 is provided. Therefore, the molding chamber 20 can be sealed by the first bellows 33, the second bellows 34, and the pressure plate 62. In order to shut off the inside and outside of the molding chamber 20, a sealing device (not shown) is provided, and the inside of the molding chamber 20 is evacuated or an inert gas atmosphere is formed in the molding chamber 20. In addition, an atmosphere forming device (not shown) is provided.

By driving the mold clamping cylinder 53, the mold clamping plate 52 can be moved up and down while the inside and outside of the molding chamber 20 are shut off. Further, by driving the pressurizing cylinder 63, the molding chamber 20
The pressure plate 62 can be moved up and down with the inside and outside shut off. Since the pressure rod 61 is fixed to the pressure plate 62, the pressure cylinder 63
Is moved up and down together with the pressing plate 62.

By the way, when the compressed air source SU1 by a constant pressure P _SU1 is generated, the head-side air chamber 53c is maintained at a pressure P _SU1, constant pressure P _SU3 is generated by the compressed air source SU3 Then, the pressure in the head-side air chamber 63c is maintained at the pressure P _SU3 . On the contrary,
The cylinder pressure in the rod side air chamber 53d is controlled by the servo valve 64.
Is controlled is the P _M by the rod-side air chamber 63d
Cylinder pressure is controlled by a servo valve 65 and P
_{It is made P.}

Next, the heating device 40 will be described. 1 is a sectional view of a heating device according to an embodiment of the present invention, FIG. 2 is a plan view of a halogen lamp according to the embodiment of the present invention, and FIG. 5 is a diagram showing an irradiation pattern of the halogen lamp according to the embodiment of the present invention. It is. As shown in the figure, the heating device 40 is disposed around the mold lamp 10 and the halogen lamp 41, and is disposed along the halogen lamp 41 and surrounding the halogen lamp 41. An annular optical reflection mirror 42 is provided. Both ends of each halogen lamp 41 are connected to a power source (not shown) via a terminal 41a. Further, the halogen lamp 41 is formed in a ring shape by combining the semicircular portions 81 and 82.

As described above, the optical reflection mirror 42 reflects the infrared light of the halogen lamp 41 and irradiates the mold apparatus 10 with a predetermined irradiation pattern as shown in FIG. And the reflection surface 42a is mirror-finished and plated with gold having a high reflectance. The irradiation pattern is set, for example, so as to approximate a distribution pattern of a normal probability distribution. The light intensity in the central portion is high, and the light intensity decreases as the distance from the central portion increases.

In this case, since the heating efficiency can be increased, the heating rate can be increased, and the molding cycle can be shortened. Further, since a ceramic material can be used as the material of the mold device 10, the cost of the mold device 10 can be reduced. In addition, since the mold device 10 is mainly heated in the central portion in the axial direction, the temperature of the central portion in the axial direction of the mold device 10 can be sufficiently increased. Also, the mold device 1
Since it is possible to prevent the temperature of the portion other than the center portion of 0 from becoming excessively high, it is possible to maintain the alignment accuracy of the lower die core 11 (FIG. 4), the upper die core 12, and the body die 13. it can.

The amount of heat input to the mold apparatus 10 can be set to a designed value, and the heating rate can be increased. Next, a control circuit of the glass forming machine having the above configuration will be described. FIG. 6 is a control circuit diagram of the glass forming machine according to the embodiment of the present invention. In the figure, reference numeral 70 denotes a control device, and the control device 70 calculates a deviation ΔT between a set temperature Ts of the mold device 10 (FIG. 3) and a temperature detection value Tk detected by the thermocouple t _H. And a control unit 75 for adjusting the deviation ΔT calculated by the calculation unit 74 and outputting a control output α1 corresponding to the set temperature Ts.
Consists of The control output α1 is output from the power regulator 76.
Is converted into electric power W, and the electric power W is supplied to the halogen lamp 41.

Therefore, the mold apparatus 10 can be set to the set temperature Ts. In the present embodiment, the halogen lamp 41 has semicircular portions 81 (FIG. 2),
Are formed in a ring shape by combining them, but a ring-shaped halogen lamp integrally formed can also be used. Further, a ring shape can be obtained by combining three or more arc portions.

Next, the operation of the glass forming machine having the above configuration will be described. FIG. 7 is a time chart showing the operation of the glass forming machine according to the embodiment of the present invention. First, at timing t1, the mold apparatus 10 on which the preform 15 (FIG. 3) is set is put into the molding chamber 20, and the inside of the molding chamber 20 is evacuated. ) Is done. Subsequently, at timing t2, the mold clamping cylinder 53 is driven, the mold clamping rod 51 is moved downward, the mold clamping force F1 is applied to the mold apparatus 10, and the body mold 1 is moved.
3 is pressed against the mold base 31 and mold clamping is started. At this time, the halogen lamp 41 of the heating device 40 is energized to start heating the mold device 10.

Then, at timing t3, the mold temperature becomes T1.
Is reached, the pressing cylinder 63 is driven, the pressing rod 61 is moved downward, and the pressing force F is applied to the mold apparatus 10.
2 is added, the upper mold core 12 is moved downward, and the preform 15 is deformed. The mold device 10
After the start of heating, the driving of the pressurizing cylinder 63 can be started when a predetermined time has elapsed.

Subsequently, after the pressurizing is performed for a predetermined time, the pressing force is changed to F3 at a timing t4, the energization of the halogen lamp 41 is stopped, and the mold apparatus 10 is turned on.
Is gradually cooled. After the driving of the pressurizing cylinder 63 is started, when the preform 15 is deformed by a predetermined amount, the pressing force can be set to F3. Then, when the mold temperature reaches T2 at timing t5, the pressurizing cylinder 63 is driven, the pressurizing rod 61 is retracted to the upper limit position, and pressurization is completed. At this time,
The molding chamber 20 is filled with an inert gas for cooling, and the cooling of the mold apparatus 10 is started.

Next, at the timing t6, the mold temperature becomes T.
When the number reaches 3, the mold clamping cylinder 53 is driven, the mold clamping rod 51 is retracted to the upper limit position, and the mold clamping is completed. At this time, the filling of the inert gas is stopped, the mold apparatus 10 is taken out of the molding chamber 20, and the mold is opened, and the molded lens is taken out.

It should be noted that the present invention is not limited to the above-described embodiment, but can be variously modified based on the gist of the present invention, and they are not excluded from the scope of the present invention.

[0030]

As described above in detail, according to the present invention, in the glass forming machine, the first core and the first core are provided.
A second core movably disposed in opposition to the first core, a body mold surrounding the first and second cores, and a heating device for heating the first and second cores; A pressurizing device for applying a pressing force to the second core.

The heating device includes a ring-shaped heat source surrounding the mold device, and an optical reflection mirror disposed around the heat source and irradiating the mold device with a predetermined irradiation pattern. In this case, since the heating efficiency can be increased, the heating rate can be increased, and the molding cycle can be shortened. Further, since a ceramic material can be used as a material of the mold device, the cost of the mold device can be reduced. In addition, since the mold device is mainly heated in the central portion in the axial direction, the temperature of the central portion in the axial direction of the mold device can be sufficiently increased.

Further, since it is possible to prevent the temperature of portions other than the central portion of the mold apparatus from becoming excessively high, it is possible to maintain the accuracy of the alignment between the first and second cores and the body mold. it can. Then, the amount of heat input to the mold device can be set to a designed value, and the heating rate can be increased.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a heating device according to an embodiment of the present invention.

FIG. 2 is a plan view of the halogen lamp according to the embodiment of the present invention.

FIG. 3 is a conceptual diagram of a glass forming machine according to an embodiment of the present invention.

FIG. 4 is a conceptual diagram of a mold device according to an embodiment of the present invention.

FIG. 5 is a diagram showing an irradiation pattern of a halogen lamp according to the embodiment of the present invention.

FIG. 6 is a control circuit diagram of the glass forming machine according to the embodiment of the present invention.

FIG. 7 is a time chart showing an operation of the glass forming machine in the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Mold apparatus 11 Lower mold core 12 Upper mold core 13 Body mold 32 Transparent quartz tube 40 Heating device 41 Halogen lamp 42 Optical reflection mirror 60 Pressurizing device F2, F3 Pressing force

Claims (2)

[Claims] (A) a first core; and (b) a second core movably disposed to face the first core.
(C) a trunk shape surrounding the first and second cores; (d)
A heating device for heating the first and second cores; and (e) a pressing device for applying a pressing force to the second core, and (f) the heating device surrounds a mold device. A glass forming machine comprising: a ring-shaped heat source; and an optical reflection mirror disposed around the heat source and irradiating the mold device with a predetermined irradiation pattern. 2. The glass forming machine according to claim 1, wherein the heating device includes a transparent quartz tube that transmits infrared light in a wavelength range of a halogen lamp between the heating device and a mold device.