JP2000044257A - Glass forming machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reproducibility of the heat up time and temp. distribution of a metal mold device. SOLUTION: This glass forming machine has a first core, a second core which freely movably disposed to face this first core, a mold 13 which encloses the first and second cores, a heating device 40 which heats the first and second cores, a pressurizing device 60 which applies pressurizing force to the second core and a mold clamping device 50 which clamps the mold 13 by applying mold clamping force thereto. The mold clamping is applied to the mold 13 and mold clamping is executed while at least the first and second cores are heated and, therefore, the occurrence of variation in the heat transfer quantity between the metal mold device 10 and the device body in each respective forming shots at the time of heating is prevented.

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, a glass molding machine for molding a glass lens is provided with a mold device comprising an upper mold core, a lower mold core and a body mold, and the upper mold core and the lower mold core are provided. A preform, which is a prototype of a lens, is set between the lens and the preform, and the preform is pressed by a pressing device.

In this case, a mold apparatus on which a preform is set can be moved at each station in a glass forming machine (Japanese Patent Laid-Open No. 4-164826).
Reference). Then, after the mold device reaches a predetermined temperature, the pressing force by the pressurizing device is applied to the mold device, and the preform is pressurized.

[0004]

However, in the above-mentioned conventional glass forming machine, the contact heat conductance varies due to the state of contact between the mold apparatus and the apparatus body of the glass forming machine, and the heating is performed for each forming shot. The amount of heat transfer between the mold apparatus and the apparatus body at the time varies.

[0005] As a result, the reproducibility of the temperature rise time and the temperature distribution in the mold apparatus decreases. SUMMARY OF THE INVENTION It is an object of the present invention to provide a glass forming machine capable of solving the problems of the conventional glass forming machine and improving the reproducibility of the temperature rise time and the temperature distribution in a mold device.

[0006]

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; A body that surrounds the first and second cores, a heating device that heats the first and second cores, a pressurizing device that applies pressure to the second core, and at least the first, A mold clamping device for applying a mold clamping force to the body mold to perform mold clamping while the second core is being heated.

In another glass forming machine of the present invention, the mold clamping force is generated from the start of heating of the mold apparatus to the end of cooling.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a conceptual diagram of a glass forming machine according to a first embodiment of the present invention.
1 is a conceptual diagram of a mold device according to a first embodiment of the present invention. In the figure, reference numeral 10 denotes a mold apparatus mounted on a mold base 31 which is an apparatus main body of a glass forming machine. The mold apparatus 10 includes 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.

Incidentally, the lower die core 11 is
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 preform 15 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 and S2, and the lens is molded.

When the lower die core 11 and the upper die core 12 are inserted facing each other,
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 has 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. A halogen lamp 41 and an optical reflection mirror 42 surrounding the halogen lamp 41 are provided in the heating element chamber 43. 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 radiated to the mold apparatus 10 through the transparent quartz tube 32 and is reflected by the optical reflecting 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 infrared rays of the halogen lamp 41 and mainly irradiate the central portion of the mold apparatus 10. As a result, the central portion of the mold apparatus 10 is heated intensively, and the preform 15 is efficiently heated.

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 pressing device 60 has a lower end opposed to the upper die core 12 and is disposed inside the clamping rod 51, and a pressing rod 61 disposed movably 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 a first bellows 33 is provided 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, a control circuit of the glass forming machine having the above configuration will be described. FIG. 3 is a control circuit diagram of the glass forming machine according to the first embodiment of the present invention. In the figure,
Reference numeral 70 denotes a control device. The control device 70 includes a mold clamping force control unit 71 and a pressing force control unit 72. The mold clamping force control unit 71 converts a mold clamping force command F _Mr into a cylinder pressure command P _Mr , a cylinder pressure command P _Mr and a cylinder pressure detection value P _MS detected by a pressure detector Pr1. Calculation unit 74 for calculating the deviation ΔP _M of
The compensation unit 75 compensates for the deviation ΔP _M calculated by the above and outputs a control output α1 corresponding to the mold clamping force command F _Mr. The control output α1 is supplied to the servo amplifier 76.
Is amplified to form a clamping force output α2, which is sent to the servo valve 64. As a result, the cylinder pressure by the servo valve 64 is in the P _M.

On the other hand, the pressurizing force control section 72 converts a pressurizing force command F _Pr into a cylinder pressure command P _Pr .
Said compensating cylinder pressure command P _Pr and the pressure detector Pr2 deviation [Delta] P _P calculated by the calculation unit 78 and the arithmetic unit 78 calculates a deviation [Delta] P _P of the cylinder pressure sensing value P _PS detected by pressure A compensator 79 outputs a control output β1 corresponding to the pressure command F _Pr . The control output β1 is amplified by the servo amplifier 80 to become a pressurized force output β2, and the pressurized force output β2 is
Sent to As a result, the cylinder pressure is set to P _P by the servo valve 65.

As described above, the cylinder pressure P _M can be generated based on the mold clamping force command F _Mr and the cylinder pressure P _P can be generated based on the pressing force command F _Pr. Not only can the body mold 13 be pressed against the mold base 31 but also an arbitrarily set pressing force can be applied to the mold apparatus 10 to deform the preform 15. Can be.

Therefore, it is possible to prevent the contact heat conductance from being varied due to the state of contact between the mold apparatus 10 and the mold base 31. There is no variation in the amount of heat transfer between the heat transfer member 31 and the heat transfer member 31. As a result, the reproducibility of the temperature rise time and the temperature distribution in the mold apparatus 10 can be improved.

In the present embodiment, the cylinder pressure in the rod-side air chamber 63d and the rod-side air chamber 53
The cylinder pressure in d can be controlled within ± 0.1 [kgf / cm ² ]. Therefore, the mold clamping force and the pressing force can be controlled with high accuracy and high reproducibility. next,
The operation of the glass forming machine having the above configuration will be described.

FIG. 4 is a time chart showing the operation of the glass forming machine according to the first embodiment of the present invention. First, at timing t1, the mold apparatus 10 in which the preform 15 (FIG. 1) is set is put into the molding chamber 20, and the inside of the molding chamber 20 is evacuated and then filled with an inert gas. ) Is done. Subsequently, at a timing t2, the mold clamping cylinder 53 is driven, the mold clamping rod 51 is moved downward, and a 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 to start mold clamping. At this time, the halogen lamp 41 of the heating device 40 is energized to start heating the mold device 10.

Then, at a 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, and the upper core 12 is moved downward to deform the preform 15. After a predetermined time has elapsed after the heating of the mold apparatus 10 is started, the pressing cylinder 6
3 can also be started.

Subsequently, when pressurization is performed for a predetermined time, the pressurizing force is changed to F3 at timing t4, the energization of the halogen lamp 41 is stopped, and the mold apparatus 10
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, an inert gas for cooling is injected into the molding chamber 20, 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 injection of the inert gas is stopped, the mold apparatus 10 is taken out of the molding chamber 20, the mold is opened, and the lens molded on the lower mold core 11 is taken out.

Next, a second embodiment of the present invention will be described. FIG. 5 is a conceptual diagram of a mold apparatus according to a second embodiment of the present invention. In the figure, 91 is a lower core as a second core, 92 is an upper core as a first core, 13 is a trunk type, and 15 is a preform. In this case, the upper mold core 92 is fixed, and the preform 15 can be deformed by pushing up the lower mold core 91 in the arrow B direction.

Next, a third embodiment of the present invention will be described. FIG. 6 is a conceptual diagram of a mold apparatus according to the third embodiment of the present invention. In the figure, 11 is a lower core as a first core, 12 is an upper core as a second core, 13 is a trunk, 13a lower trunk, 13b upper trunk, and 15 is a preform. In this case, since the body mold 13 is divided, the management of the mold apparatus 10 becomes easy.

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.

[0031]

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 that applies a pressing force to the second core, and a mold clamping device that performs mold clamping by applying a mold clamping force to the body mold while at least the first and second cores are being heated. Have.

In this case, while at least the first and second cores are being heated, a mold clamping force is applied to the body mold to perform mold clamping. Therefore, it is possible to prevent the contact heat conductance from being varied due to the contact state between the mold apparatus and the apparatus main body. Therefore, for each molding shot, the heat transfer amount between the mold apparatus and the apparatus main body at the time of heating is reduced. Does not vary.

As a result, the reproducibility of the temperature rise time and the temperature distribution in the mold apparatus can be improved.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a glass forming machine according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of a mold device according to the first embodiment of the present invention.

FIG. 3 is a control circuit diagram of the glass forming machine according to the first embodiment of the present invention.

FIG. 4 is a time chart illustrating an operation of the glass forming machine according to the first embodiment of the present invention.

FIG. 5 is a conceptual diagram of a mold device according to a second embodiment of the present invention.

FIG. 6 is a conceptual diagram of a mold device according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Die apparatus 11, 91 Lower die core 12, 92 Upper die core 13 Body 40 Heating device 50 Mold clamping device 60 Pressurizing device

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, (e) a pressurizing device for applying pressure to the second core, and (f) at least the first and second cores are heated. A mold clamping device for clamping the mold by applying a mold clamping force to the body mold. 2. The glass forming machine according to claim 1, wherein the mold clamping force is generated from the start of heating of the mold apparatus to the end of cooling.