JPH01257145A - Press mold - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a press apparatus, and particularly to a press mold for press-molding a material softened by heating, such as when molding precision mechanical parts.

[Conventional technology]

Conventionally, when molding a pressed product, for example, Japanese Patent Application Laid-Open No. 60-2
As shown in Japanese Patent No. 10554, a structure in which a press mold body, upper mold, and lower mold were built into the heating furnace was often used.

[Problem to be solved by the invention]

However, in the conventional press molding die, there is room for further improvement in the following points.

First, during press molding, in order to supply materials and take out the molded product, vacuum exhaust, nitrogen gas introduction, air introduction, lid,
The upper mold must be removed, making automatic continuous molding difficult.

Second, because the heating furnace has a built-in press mold,
The temperature required to take out the molded product after press molding due to its poor heat dissipation cooling properties (press molding temperature 75 for glass material SK5)
Compared to 0°C, since the take-out temperature was exposed to the atmosphere and taken out, it took a long time to cool the mold to a temperature at which it would not oxidize (200°C or lower).

Thirdly, the temperature of the heating furnace is 200°C, the temperature at which the molded product is taken out.
It was necessary to repeat the process of rapidly heating the product from 730°C to the press molding temperature and then cooling it to 200°C or less after press forming, resulting in a large loss of thermal energy (power).

Fourthly, since the temperature cycle of 200 to 760° C. is repeated for each press molding, the heating furnace heater is seriously damaged and the life of the heating furnace is shortened.

An object of the present invention is to provide a press molding die that can automatically and continuously form press-formed products in a short time without impairing the shape accuracy of hot press-formed products such as precision optical parts. It is in.

[Means to solve the problem]

The above purpose is to provide a body mold which is a hollow body and has a heating means on its outer peripheral surface and a cooling means below the heating means, and a solid body that fits into the body mold, which forms a concave part on the lower end face, and has a hollow body on the upper end face. an upper mold that is connected to the first pressing means; and a lower mold that is a solid body that fits into the body mold, has a recess on its upper end surface, and whose lower end surface is connected to the second pressing means. In the press mold, wherein a recess of the upper mold and a recess of the lower mold are slidably disposed inside the body mold so as to face each other, the heating means is provided on a side surface of the body mold. The first part that supplies the press material to the position where
This is achieved by providing an opening, a second opening for carrying out the pressed product, and a third opening for carrying in and out of the cooling plate at the position where the cooling means is provided.

[Effect]

Immediately before press forming, the lower end surface of the upper mold is above the first opening of the body mold, the upper end surface of the lower mold is at the press material receiving position slightly below the first opening, and The upper mold is heated by means of heating on the outside of the mold.

The temperature is required for press molding with the lower mold.

The preheated press material is supplied from the first opening to the recess of the lower mold. When the press material is heated to the temperature required for molding, the lower die descends within the body mold and stops at the position where the cooling means is provided.Next, the upper die descends within the body mold in the same way as the lower mold. It comes into contact with the lower mold and pressurizes the press material by the pressing means. At the same time as the press forming is completed, a cooling plate serving as a cooling means is introduced from the third opening of the body mold to cool the upper mold and the lower mold.

When the pressed product is cooled to a predetermined temperature, the upper mold is raised to a predetermined position, and then the lower mold is raised to the second opening of the body mold, and the pressed product is carried out. When the press product is completely unloaded, the lower die is lowered to the press material receiving position to prepare for the next cycle.

In this way, each pressing step is performed continuously in a short time.

〔Example〕

Hereinafter, the present invention will be explained based on examples of the eighth factor from FIG. 1. FIG. 1 is a longitudinal sectional view showing the overall structure of the press molding die according to the present invention, and FIG. 2 is a l@1 Figure 1 is a vertical view of the barrel type shown by reference numeral 1, Figure 6 is a side view of Figure 2, Figure 4 is a cross-sectional view taken along IV-fV in Figure 2, and Figure 5 is a cross-sectional view taken along line v-■ in Figure 1. It is a diagram.

1 to 5, reference numeral 1 denotes a cylindrical body, and on the side surface of the central part of the body 1, there is a rectangular press material supply port 1a, and a press material supply port 1a facing the supply port 1a is provided. A finished product outlet 1b is drilled, and a press finished product outlet 1b is provided.
The width of the press material supply port 1a (which has the same shape as the press material supply port 1a) is made larger than the inner diameter of the body mold 1 in order to enable the press-formed product to be taken out from the inside of the lower mold 5, which will be described later. In addition, heaters 9 are attached to the upper and lower sides of the body mold 1, centering on the press material supply port 1a and press finished product outlet 1b, and two rectangular cooling plate inlets and outlets are bored in the lower side of the body. The width thereof is the same as the inner diameter of the body mold 1.

The body mold 1 is fixed to the mold holder 11 by bolts inserted into holes. Reference numeral 6 designates an upper mold that is attached to a press ram (not shown) and slides vertically within the mold 1. 5 has an embossing rod 5a that passes through the through hole 1c of the body mold 1 and is connected to a hydraulic press (not shown).
This is a lower mold that slides vertically within the mold 1. However, the gap between the outer diameter of the upper die 6 and the lower die 5 and the inner diameter of the body die 1 is almost 0, and when the mold is closed, the above-mentioned upper die b1, lower die 5 and body die 1 form a pressed finished product. A void of approximately the same shape is modeled.

3 is a chute arranged horizontally facing the press material supply port 1a of the circular mold 1; 4 is a material supply device that rolls the press material 2 on a seatro and supplies it into the lower mold 5; 8 is a finished press product The extraction device has a suction part 8a, is connected to a vacuum pump (not shown), and reciprocates in the horizontal direction.10 is a circular shape 1
There are two opposing cooling plates that are horizontally movable facing the cooling plate entrance/exit 1dK, both of which are machined to be smaller than the cooling plate entrance/exit, and have push rods and air cylinders (not shown).
It is connected to the. The inside of the cooling plate is a water cooling jacket, and cooling water is constantly flowing through it.

Note that the surface IGa of the cooling plate has the same diameter as the upper and lower molds.

The present invention has the above-mentioned configuration, and the operation system of the press molding die shown in the embodiment will be explained based on FIG. 1 and FIGS. 6 to 8.

Figure 6 shows the press molding die shown in the first cause.
A longitudinal cross-sectional view of the heated softened material 2' in the state shown in the figure is first lowered to the bottom dead center, and then the upper mold is lowered to pressurize it. Figure 7 is shown in Figure 6. Following the process, the press material is pressurized and at the same time, after the pressurization is finished, the cooling plate is moved to bring the surface into contact with the outer periphery of the upper mold and the lower mold, and the vertical view, FIG. 8, is shown in FIG. It is a longitudinal cross-sectional view of a state in which the pressed finished product 7 is taken out from the mold following the cooling process shown.

When the upper mold 6 and lower mold 5 in FIG. 1 are heated by the heater 9 to the temperature required for predetermined molding (730° C. in the case of glass material SK5), the predetermined temperature is increased in another heating furnace (not shown). (
The press material 2 heated to a temperature below 600°C (at which it does not deform even when rotated on a shade) is rolled on the chute 3 shown in Figure 1 by the material supply device 4 that advances in the direction of the arrow in the figure. , falls from the press material supply port 1a of the circular mold 1 and is supplied into the lower mold 5. After that, the material supply device 4 retreats. After a predetermined period of time, when the press material 2 is heated to a temperature of 730° C. or higher, which is necessary for press forming, the lower mold 5 first descends within the set mold 1 and moves to the bottom dead center, as shown in Fig. 6. The upper mold 6 is lowered, the converted material 1 is pressurized by the upper mold 6 and the lower mold 5, and the mold is closed as shown in FIG.
Inside mold 5 - the press finished product 12 is molded Next, when the press finished product 7 is molded, the cooling plate 10 moves forward in the direction of the arrow in the same figure, and the upper mold 6 and the lower mold in the closed mold state The pressed finished product 7 is cooled by contacting the outer circumference of the press 5. The pressed finished product 7 is taken out at a predetermined temperature (500°C in the case of glass material SK5).
When the temperature drops to K, the cooling plate retreats to its original position as shown in FIG. 8, and then the upper mold 6 rises to a predetermined position, and the press finished product take-out device 8 moves forward in the direction of the solid line arrow in FIG. Then, it stops at the position where the suction part 8a is above the lower mold 5.Next, the lower mold 5 lightly contacts the suction part 8a of the pressed finished product take-out device 8 with the pressed finished product 7 via the embossing rod 5a. be pushed up to. When the pressed finished product 7 is sucked into the suction section 88, the lower mold 5 is lowered to the material receiving position (the position shown in FIG. 1), and the pressed finished product 7 is separated from the lower mold 5. During this time, the heater 9 is constantly operating, but the production of finished products is completed before the temperature rises to a temperature (650° C.) at which the shape of the finished products collapses. When the press finished product take-out device @ 8 retreats in the direction of the dotted arrow in FIG. Gas is introduced into the section 8a, and the pressed finished product 7 is stored in the storage area. Note that at the same time as the press finished product take-out device 8 retreats, the press material 2 is supplied into the lower die 5 by the material supply device 4 and heated again to the temperature required for predetermined press forming, and the above-mentioned pressing operation is performed thereafter. By repeating this process, a predetermined number of desired pressed finished products 7 can be obtained continuously.

The configuration and operating system of the press molding die according to the present invention are as described above, and in the present invention, when pressurizing the softened material 2' heated to a temperature higher than that required for press forming, the die 6 and Since the lower mold 5 is always located within the side mold 1 throughout the entire pressing process, the gap between the upper mold 6 and the lower mold 5 and the circular mold 1 can be reduced, and the center of the upper and lower surfaces of the press-formed product 7 can be kept small. A molded product 7 with less deviation can be easily obtained.

In addition, since the circular mold 1 has a material supply port Ia and a molded product take-out port 1b, it is necessary to open it to the atmosphere each time press molding is performed, remove the lid and upper mold, supply the material, and take out the molded product. It becomes possible to perform press forming automatically and continuously without any problems.

Furthermore, in the present invention, a cooling plate inlet/outlet is provided in the body mold 1 located below the material supply port 1a and the press finished product outlet 1b, and after press forming, the cooling plate is directly connected to the outer wall of the upper mold and lower mold. The mold cooling time can be significantly shortened. In addition, there is no need to turn off the heater 9 to cool down the amount of metal after pressing, so the press material heating section can be kept at a high temperature at all times, and the time required to reheat the upper mold 6 and lower mold 5 can also be shortened. This makes it possible to shorten press molding cycle time.

The life of the heater 9 can be extended since there is no need to repeat the temperature cycle.

〔Effect of the invention〕

According to the present invention, an opening for supplying the press material to the body of the press mold, an opening for taking out the press-formed product, and an opening for carrying in and out the cooling plate for cooling the upper mold and the lower mold are provided. Therefore, there is no need to remove the lid or upper mold during a series of press molding processes, making it possible to perform continuous molding and improve productivity.

[Brief explanation of the drawing]

The first factor is a vertical cross-sectional view showing the overall configuration according to an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the trunk, FIG. 3 is a side view of FIG. 5 is a cross-sectional view taken along V-■ in FIG. 1, and FIG. 6 is a longitudinal sectional view immediately before pressing the softened material using the press molding die shown in FIG. 1. 7th
The reason for this is a vertical cross-sectional view of the mold being cooled, and FIG. 8 is a vertical cross-sectional view of the mold being taken out of the pressed finished product. 1... Trunk mold, 1a... Press material supply port, 1b...
・Press finished product outlet, 1d...Cooling plate inlet/outlet, 2・
...Press material, 5...Lower die, 6...Upper die, 7...
・Press finished product, 9... Heater, 10... Cooling plate.

Claims (1)

[Claims] 1. A hollow body having a heating means on its outer circumferential surface and a cooling means below the heating means, and a solid body that fits into the body mold with a recess formed on the lower end surface and the upper end surface having a recess. a lower mold that is a solid body that fits into the body mold, has a concave portion in its upper end surface, and has a lower end surface that is connected to the second pressing means. In a press mold in which a recess of the upper mold and a recess of the lower mold face each other and are slidably disposed inside the body, the heating means is provided on a side surface of the body. a first opening for supplying the pressed material to the position where the press material is placed, a second opening for carrying out the pressed product, and a third opening for carrying the cooling means into and out of the position where the cooling means is provided.
A press mold characterized by having an opening.