JPS63310736A - Heating and cooling device for press die - Google Patents

Abstract

PURPOSE:To obtain a glass forming product in a short time with good productivity without deterioration of shape preciseness by moving the movably constituted press die inserted with glass material to a heating furnace which is separately located, to heat the glass material, and then moving to the specified position to carry out press-forming and cooling. CONSTITUTION:Glass material 1 adsorbed to an adsorption jig 8 is inserted between an upper die 3 and a lower die 4 of press dies P, and then a pusher 6 is moved to the direction a2 to locate the press dies P to the heating position H, and pushers 17 are moved to the directions e2 by air cylinders 18 to bring the inner walls 16c of a cylindrical heating furnace 16 divided into halves into contact with the outer wall of a container 2 of the press dies P. Then, the heated press dies P is moved to the direction a1 by the pusher 6 to locate to the pressing and cooling position C, and the glass material 1 is pressed between the upper and the lower dies 3 and 4 by a pusher 11 to form a glass forming product 1, and then pushers 14 are moved to bring the inner wall 13a of a cylindrical cooling device 13 divided into halves into contact with the outer wall of the container 2 to cool, and the glass forming product 1 is taken out from the press dies P.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a heating and cooling device for a press mold, and in particular, by heating and cooling a press mold at high speed, molded products,
The present invention relates to a press-type heating and cooling device suitable for improving the productivity of precision optical parts hot-press-molded from glass materials, for example, without impairing the shape accuracy of the molded products.

[Prior Art] Conventionally, when molding a heated material, such as a glass material, in a press mold, as described in Japanese Patent Application Laid-Open No. 59-123629, a container and a bottom of the press mold are placed inside the heating furnace. Many structures with built-in molds were used. With this configuration, the structure of the device is simple,
In addition, since the press mold container and lower mold are built into the heating furnace, there is an advantage that the press mold can be heated to the press molding temperature in a short time.

[Problems to be Solved by the Invention] The above-mentioned prior art does not take into consideration the following points (1) to (3).

(1) Since the heating furnace has a structure in which a part of the press mold is built-in, heat dissipation is poor, and the temperature required to take out the molded product from the press mold after press molding (for example, the press molding temperature is lower than 740°C) It took a long time to cool down to a temperature approximately 100 to 150°C lower.

(2) The temperature of the heating furnace is approximately 6
Since it is necessary to repeat the process of rapidly heating from 40°C to the press forming temperature of approximately 740'C and rapidly cooling it to 640°C after press forming, the thermal energy (electricity) is
The loss was large.

(3) Because the temperature cycle of 640° C. to 740° C. is repeated for each press molding, the heater of the heating furnace is severely damaged, and the life of the heating furnace is short.

In this way, a part of the press mold is built inside the heating furnace,
Conventional configurations that heat the press mold to a temperature suitable for press molding, where the material softens, were able to heat the press mold to high temperatures in a short time, but the shape accuracy of the molded product was impaired. It takes a long time to cool down the press mold to a very low temperature, that is, to the take-out temperature, which poses a problem in the productivity of molded products.

The present invention improves the problems of the conventional technology described above, and heats the press mold at high speed in order to make it possible to produce molded products in a short time without impairing the shape accuracy of the molded products. The object of the present invention is to provide a press-type heating and cooling device that can perform both heating and cooling.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the configuration of the press mold heating and cooling device according to the present invention is to mold a heated material with a press mold located at a pressing position, and to form the molded product. A press mold reciprocating device capable of reciprocating the press mold between a heating position and a pressing position/cooling position; , when each moves close to each other and advances to a predetermined position, the inner wall surface comes into contact with the outer wall surface of the press mold at the heating position so as to hold it, and the press mold can be heated to a predetermined temperature. , when the two divided cylindrical heating furnaces are advanced to a predetermined position in close proximity to each other, the inner wall surface thereof comes into contact with the outer wall surface of the press die in the press position and cooling position so as to hold it; The press mold is equipped with a two-part cylindrical cooling device that can cool the press mold to a predetermined temperature.

More specifically, in order to heat and soften the material, press-form it under high temperature, cool the press mold, and take out the molded product, a part of the press mold is incorporated into the interior of the heating furnace as in the conventional method. The press mold is separated from the heating furnace without using the heating furnace, and the heating furnace is brought into contact with the outer periphery of the press mold only during heating, and when the press mold is cooled to take out the molded product, this press mold The cooling device can be brought into contact with the outer circumferential part of the cylinder to cool it.

[Function] The heating furnace is always kept at a high temperature near the press forming temperature, and only when the press mold is heated to the press forming temperature, the inner wall surface of the heating furnace is brought into contact with the outer periphery of the press mold to emit radiation. and heat conduction to rapidly heat the press mold. During cooling after molding, the heating furnace is separated from the press mold, and a cooling device (internally water-cooled) is brought into contact with the press mold to cool the press mold to a predetermined temperature by heat conduction.

[Example] Before entering into the description of the example, basic matters related to the present invention will be explained.

When press-molding a material, such as a glass material, the glass material is generally heated to several tens of degrees Celsius (740°C) higher than its yield point temperature (for example, 690'C for SK5) to soften the glass, and then press. The molded product and press die are molded into a predetermined shape using a mold, and then the molded product and the press mold are cooled until the glass solidifies and the shape accuracy of the molded product is not impaired.Generally, the temperature is below the transition point temperature of glass, and SK5 In this case, a method is used in which the molded product is removed from the press mold at a temperature of 650° C. or lower (for example, about 640° C.).

However, with the conventional structure in which a part of the press mold is built inside the heating furnace, it takes about 5 minutes to heat the press mold from the take-out temperature of about 640°C to the press molding temperature, and it takes about 5 minutes to cool down after molding. It took about 15 minutes to form the mold, which caused a problem in productivity. Therefore, the present invention separates the press mold from the heating furnace and provides a cooling device. The press mold was heated and cooled.

In this way, by separating the press mold and heating furnace and installing a separate cooling device for heating and cooling, processing costs can be reduced by significantly shortening heating and cooling time and reducing energy loss during heating. A significant reduction is possible. For example, high-speed heating and cooling can be performed in about 2 minutes for heating and about 2 minutes for cooling.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings and an example in which a precision optical component is molded from a glass material.

FIG. 1 is a partial cross-sectional plan view showing a press-type heating and cooling device for molding precision optical components according to an embodiment of the present invention, and FIG. 2 is a front cross-sectional view taken along the line A-A' in FIG. Figure 3 is
FIG. 4 is a sectional plan view showing details of one side of the cooling device in FIG. 1, FIG. 4 is a sectional view taken along the line BB' in FIG. 3, and FIG.
A cross-sectional plan view showing details of one side of the heating furnace in FIG.
FIG. 6 is a sectional view taken along the line c-c' in FIG. 5.

An overview of this press-type heating and cooling device will be explained with reference to Figs. It is used for molding, cooling the glass molded product 1 related to this molded product, and taking it out from the press mold P, and the press mold P is located between the heating position H and the pressing position/cooling position C. The press mold reciprocating device 2o can be reciprocated at When the two-part cylindrical heating furnace 16 comes into contact with the press mold P and heats the press die P to a predetermined temperature, and when the two parts approach each other and advance to a predetermined position, the inner wall 13a surface is in the press position and A press mold equipped with a two-part cylindrical cooling device 13 that is able to hug and abut the outer wall surface of the press mold P at a cooling position C and cool the press mold P to a predetermined temperature. This is a heating and cooling device.

This configuration will be explained in detail below.

In the figure, 1 is a glass molded product, 2 is a container that serves as a guide when the upper mold 3 of the press mold P moves up and down, 3 is an upper mold for molding the glass molded product 1, and 4 is a glass molded product. The press die P is a lower die facing the upper die 3 for molding the container 2.1. Upper mold 3. It consists of 4 lower molds. 5 is a press mold holder on which the press mold P is placed and fixed and is moved between the press position/cooling position C and the heating position H; 6 is the press mold holder 5
A button (1) for moving in the l a direction.

7 is an air cylinder (1) that operates this button (1) 6, and the press mold reciprocating device 20 is connected to the press mold holder 5. Button (1) 6° air cylinder (1
) consists of 7.

8 is a suction jig for suctioning the glass molded product 1 and the glass material (not shown), and 9 is a suction jig 8 for holding the suction jig 8 and connecting the press mold P and the storage box (not shown). Between the steps
The buttons (2) and 10 that move in the direction b and 10 operate the air cylinders (2) and 11 that operate the buttons (2) and 9. The air cylinders (2) and 11 move the upper mold 3 of the press mold P to press-form the glass material. , and a button (3), 12 having a holder for raising the upper die 3 in order to make it possible to take out the glass molded product 1 is a hydraulic cylinder for operating this button (3) 11. .

Reference numeral 13 denotes a two-part cylindrical cooling device capable of cooling the press mold P heated to a high temperature to the temperature at which the glass molded product 1 is removed. As shown in Figures 3 and 4, I [(the other one has the same structure) is a semi-cylindrical structure with a space inside, made of fully bent material, and the space has a space from xl to x2. By flowing water, the entire cooling device 13 is cooled, and when the inner wall 13a of the cooling device 13 comes into contact with the outer wall of the container 2 of the press mold P, the press mold P can be cooled.

14 is a pusher (4) that holds one side of the cooling device 13 and moves in the d, t, and dX directions, 15t*, and an air cylinder (3) for operating the pushers (4) and 14.

Reference numeral 16 denotes a two-part cylindrical heating furnace that can heat the press die P to the press forming temperature. As shown in Figures 5 and 6, it has a furnace body 16b made of a cylindrical bridge structure with heating wires 16a embedded therein, and its inner wall 16
c comes into contact with the outer wall of the container 2 of the press die P, making it possible to heat the press die P to a predetermined press forming temperature. Furthermore, 16d is a heat insulating plate for preventing heat radiation from the cylindrical heating furnace 16. 17 holds each side of this cylindrical heating furnace 16 and performs e-work.

The buttons (5) and 18 that move in the e2 direction are equipped with an air cylinder (4) for moving the buttons (5) and 17.
). Further, 19 is a frame for supporting each of the cylinders.

The operation of the press-type heating and cooling device configured as described above will be explained using FIGS. 1 and 2 and FIGS. 7 to 11.

7 to 11 are for explaining the operation of the heating and cooling device for the press mold according to FIG. 1, and FIG.
FIG. 8 is a partial cross-sectional plan view showing a state in which a glass molded product is taken out from a press mold using a suction jig, taken along line D-D' in FIG. 7.
9 is a partially sectional plan view showing the state in which the press die has been moved from the press position/cooling position to the heating position; FIG. 10 is a cylindrical heating furnace to the press die in the heating position. FIG. 11 is a partially sectional plan view showing a state in which the press mold is being heated by the heating furnace as it moves forward, and FIG. 11 is a sectional front view taken along the line E-E' in FIG.

A press die P heated to a press forming temperature (for example, 740°C for SK5) (the heating method will be described later) is moved in the direction a by the pusher (1) 6 and positioned at a press position and cooling position C. Ru. The hydraulic cylinder 12 operates, and the pusher (3) 11 moves in the c1 direction to press the glass material between the upper mold 3 and the lower mold 4, thereby molding the glass molded product 1. Opposing air cylinder (3) 15
operates, the pusher (4) 14 moves in the d2 direction, and the inner wall 13a of the cooling device 13 comes into contact with the outer wall of the container 2 (Fig. 1).
Cool to a temperature of 64.0° C. for K5). in this case,
Since water is constantly flowing into the inside of the cooling device 13, heat absorption from the press mold P is large, and the cooling device 13 is cooled from 740°C to 640°C in about 2 minutes.

When the press die P is cooled to a predetermined take-out temperature (approximately 640° C.), the glass molded product 1 is then taken out from the press die P.

That is, when the press die P is cooled to a predetermined unloading temperature, the cooling device 13 moves in the d direction. By the operation of the hydraulic cylinder 12, the button (3) 11 moves in the 02 direction, and the upper die 3 rises. Next, air cylinder (2)
10 operates, the pusher (2) 9 moves in the b2 direction, inserts the suction jig 8 into the center of the press mold P, and vacuum-chucks the glass molded product 1 onto the suction jig 8 (Fig. 7). . The suction jig 8 moves in the direction b1, and the removal of the glass molded product 1 is completed.

Next, a glass material is suctioned from a glass material storage section (not shown) by the suction jig 8, and the glass material is inserted into the press die P by the reverse operation of taking out the glass molded product 1 described above. Then, as shown in FIG.
Positioned at WH. The air cylinder (4) 18 operates, the pusher (5) 17 moves in the e2 direction, and the inner wall 16c of the cylindrical heating furnace 16 comes into contact with the outer wall of the container 2 of the press mold P (Fig. 10). is heated to press forming temperature. In this case, since the cylindrical heating furnace 16 is always kept at a high temperature, the temperature of the press die P rises quickly, and
It can be heated from 40°C to 740°C in about 2 minutes.

The press mold P heated to the press molding temperature in this way
is moved in the direction a by the pusher (1) 6, and positioned at the press position and cooling position C in the same manner as before.

By repeating the operations shown in FIGS. 1, 2, and 7 to 11 described above, the press mold P can be heated and cooled at high speed, and the glass material can be press-molded.

The effects of the embodiment described above will be described with reference to FIG. 12 as follows.

FIG. 12 is a molding cycle diagram showing a comparison between an example of a molding cycle carried out using the press mold heating and cooling device shown in FIG. 1 and a conventional molding cycle.

(2) By separating the press L/press mold P and the cylindrical heating furnace 16, it is possible to keep the cylindrical heating furnace 16 at a high temperature at all times, and the time to heat the press mold P is 5 times longer than the conventional one.
It was possible to shorten the time from 1 minute to about 2 minutes.

◎When cooling the press mold P, the press mold P is separated from the cylindrical heating furnace 16 and the cooling device 13 is brought into contact with the press mold P, so the cooling speed is increased and the cooling time is reduced to about 15 It was possible to shorten the time from 1 minute to about 2 minutes.

θ, since the press die P can be heated and cooled at high speed, the productivity of the glass molded product 1 is improved without impairing the shape accuracy of the glass molded product 1.

It is now possible to maintain the cylindrical heating furnace 16 at a high temperature at all times, and the temperature of the heating furnace can be increased from 640 to 7
Since there is no need to repeatedly raise and lower the temperature at 40''C, power consumption is low and the life of the heating furnace is long.

(2) Because the heating and cooling speeds have become faster, the time required for one cycle can be reduced from the conventional 20 minutes to about 115 minutes, as shown in the molding cycle diagram in FIG. 12, to 4 minutes for one cycle.

[Effects of the Invention] As explained in detail above, according to the present invention, the press mold can be operated at high speed in order to make it possible to produce molded products in a short time without impairing the shape accuracy of the molded products. It is possible to provide a press-type heating and cooling device that can perform heating and cooling.

[Brief explanation of the drawing]

FIG. 1 is a partial cross-sectional plan view showing a press-type heating and cooling device for molding precision optical components according to an embodiment of the present invention, and FIG. 2 is a front cross-sectional view taken along the line A-A' in FIG. Figure 3 is
FIG. 4 is a sectional plan view showing details of one side of the cooling device in FIG. 1, FIG. 4 is a sectional view taken along the line BB' in FIG. 3, and FIG.
A cross-sectional plan view showing details of one side of the heating furnace in FIG.
FIG. 6 is a sectional view taken along the line c-c' in FIG. 5, and FIGS. 8 is a partial cross-sectional plan view showing a state in which the cooling device is retracted from the press mold which is in the pressing position and cooling position, and a glass molded product is being taken out from the press mold by a suction jig. FIG. -D' arrow sectional plan view, FIG.
The figure is a partial cross-sectional plan view showing a state in which the cylindrical heating furnace advances toward the press mold in the heating position and the press mold is heated by this heating furnace. A cross-sectional front view in the direction of arrows, FIG. 12 shows an example of a molding cycle carried out using the press-type heating and cooling device shown in FIG.
It is a molding cycle diagram showing a comparison with a conventional molding cycle. 1... Glass molded product, 13... Cooling device, 13a.
...Inner wall, 16... Cylindrical heating furnace, 16c... Inner wall, 20... Press type reciprocating device, P... Press type,
H...Heating position, C...Press position and cooling device.

Claims (1)

[Claims] 1. In a heating and cooling device for a press mold, which is used to mold a heated material with a press mold located at a press position, cool the molded product, and take it out from the press mold, the press mold is placed between the heating position and A press-type reciprocating device that can be reciprocated between a press position and a cooling position, and when each advances to a predetermined position in close proximity to each other, the inner wall surface
a two-part cylindrical heating furnace that can hold and abut the outer wall surface of the press mold at the heating position and heat the press mold to a predetermined temperature; a two-part cylindrical shape whose inner wall surface hugs and abuts the outer wall surface of the press mold at the pressing position and cooling position, and is capable of cooling the press mold to a predetermined temperature; A press-type heating and cooling device characterized by comprising a cooling device.