JPH0132044B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides dishes, bowls, and
To facilitate the release of the mouth edge of the molded product at the insulation separation point at the joint between the upper and lower molds when press-molding tableware such as cups in a sealed mold. This invention relates to a mold release device in a press molding device for tableware.

Conventionally, when molding tableware using ceramic raw materials, molding is done using a plaster mold on a potter's wheel to make it easier to release the molded material, but the lifespan of the plaster mold is short and it takes a considerable amount of time until the mold is released. It is uneconomical to have to keep a large number of molds, and when molding the upper surface of the molded material with a baking iron, the iron is heated to a certain temperature in order to make it easier to release the mold, and the surface of the mold is heated frequently. It had drawbacks such as the need to apply a molding agent.

In view of these drawbacks, the present invention has been developed to pressurize a molding base of a predetermined shape into a sealed shape using a metal lower mold and a metal upper mold for molding tableware, and when releasing the upper mold. The negative electrode of the first DC power source is connected to the upper mold, and the positive electrode of the second DC power source is connected to the suction head for removing the molded material from the lower mold. In a press molding device that connects an electrode to a lower mold with its negative electrode, the upper mold interposes an air permeable insulating material such as gypsum from the joint to the lower mold to the edge molded part of the molding base, and An embodiment of the present invention will be described below by forming a communication path that communicates the air supply path and the insulator, and connecting a pipe through which compressed air is supplied to the communication path to solve the above-mentioned drawbacks. To explain based on the drawings, reference numeral 1 denotes a press molding machine, in which a rotating shaft 4 is pivotally supported at the center of a slider 3 attached to a press ram 2 that is controlled to move up and down, and the rotating shaft 4 is connected to gears 5,
5' to a motor 6 attached to the side of the slider 3, the motor 6 controls the rotation of the rotating shaft 4, and a metal is connected to the lower end of the rotating shaft 4 via an upper die mounting base 7. At the same time, an insulator 9 is interposed between the upper mold mount 7 and the rotating shaft 4 to insulate and separate the upper mold 8.

10 is a lower mold made of metal;
is attached to the table 12 of the press molding machine 1 via an insulator 11.

In addition, an insulator 15 having air permeability such as plaster is interposed in the upper mold 8 from the joint 13 to the lower mold 10 to the edge molding part 14 of the molding base W to insulate and separate the upper mold 8 and the lower mold 10. It's forcing me.

Note that 16 is a pool of surplus clay formed at the joint 13 between the upper mold 8 and the lower mold 10.

Further, an air supply passage 17 is formed extending from the upper end axis of the rotating shaft 4 to the upper mold 8, and a communication passage 18 is formed in the upper mold 8 for communicating the air supply passage 17 and the insulator 15 having air permeability. A rotary joint 20 to which a pipe 19 to which compressed air is supplied is connected to the upper end of the rotating shaft 4 is connected to the air supply path 1.
It is rotatably mounted so as to communicate with 7.

Reference numeral 21 designates a first DC power supply section, the positive electrode of which is connected to the lower mold 10, and the negative electrode connected to the brush 2.
2. Connect to the upper mold 8 via the upper mold mounting base 7,
Further, a second DC power supply section 23 is separately provided, and its positive electrode is connected to a suction head 24 for taking out the molded body W, and its negative electrode is connected to the lower mold 10.

Next, to explain the molding method, as shown in FIGS. 2 to 5, first, the raw material M is put into the lower mold 10, and then the upper mold 8 is lowered to perform pressure molding. 1 When a DC current is applied from the DC power supply section 21 to the upper mold 8 and the lower mold 10, the molded base material W is applied to the surface of the upper mold 8 on the negative electrode side due to electroosmotic action.
Since the moisture inside collects, a state is created where it is easy to release the mold between the upper mold 8 and the molded base W, and at the same time, the air supply path 1
7. When compressed air is supplied through the communication path 18, the insulator 15 is applied to the edge molded portion 14 of the molded body W which is not electrically released due to the interposition of the insulator 15.
Since compressed air is blown through the mold, the mold can be easily released, and in this state, the motor 6 is driven to rotate the upper mold 8 to polish the inner surface of the molded material W. Thereafter, the upper mold 8 is lifted up and released, and the lower mold 10 is moved below the suction head 24. When the suction head 24 is lowered and brought into close contact with the molding base W, the second DC power supply unit 23 connects the lower mold 10 with A current flows between the suction head 24 and the lower mold 10 becomes the negative electrode side, so the moisture in the molded material W collects on the surface of the lower mold 10, making it easy to release the mold, and then the suction head The molded base W is taken out from the lower mold 10 by the adsorption action of the mold 24.

If the molded material W is not in a rotating shape, pressure molding is performed without providing a rotating mechanism consisting of the rotating shaft 4, motor 6, and gears 5, 5', or without driving the motor 6. Electric mold release by the power supply unit 21 and second DC power supply unit 23 and mold release by supply of compressed air are performed in the same manner as in the case of the rotary type, and the molded body W is taken out. If no rotation mechanism is provided, compressed air is supplied directly from the communication passage 18 formed in the upper mold 8.

In addition, Figures 6 and 7 show the charging of raw materials M and the molding base W.
Fig. 6 shows an example in which the removal of the lower mold is automated.
The table 12' on which 0 and 10' are mounted is controlled to rotate intermittently between the molding position A and the take-out position B,
Further, a raw material inputting position C is provided behind the unloading position B, and between the unloading position B and the raw material inputting position C, a loading/unloading device 26 equipped with a suction head 24 for the forming body W and a suction cup 25 for the raw material M is moved up and down. The table 12' and the loading/unloading device 26 are arranged to be able to be freely controlled intermittently and are operated in conjunction with the press molding machine 1.

Fig. 7 shows a slide table system, in which the table 1 is equipped with two lower molds 10, 10'.
2" at the center molding position A and the loading/unloading position D on both sides,
A suction head 2 for the molded material W is provided above the loading and unloading positions D and D'.
4, 24' can be freely controlled up and down.
7 and 27', respectively, so that the table 12' and the take-out devices 27 and 27' can be operated in conjunction with the press molding machine 1.

In short, the present invention allows a molding base W of a predetermined shape to be pressure-molded in a sealed manner by a lower mold 10 made of metal for molding tableware and an upper mold 8 made of metal, and when the upper mold 8 is released, A negative electrode of the first DC power source 22 is connected to the upper mold 8 and a positive electrode thereof is connected to the lower mold 10, and a suction head 24 is used to take out the molded material W when releasing the molded material W from the lower mold 10. In a press molding device that connects the positive electrode of the second DC power source 23 to the lower mold 10 and the negative electrode thereof to the lower mold 10, the upper mold 8 has a connecting portion 13 to the lower mold 10 to the edge molding portion 14 of the molding base W. An air permeable insulator 15 such as plaster is interposed across the air supply path 17.
A communication path 18 is formed to communicate between the upper mold 8 and the insulator 15, and a pipe 19 through which compressed air is supplied is connected to the communication path 18, so that when the upper mold 8 is raised after molding, the upper mold 8 and the lower mold 10 are connected to each other. Moisture in the molded material W gathers on the surface of the upper mold 8 on the negative electrode side due to the electroosmotic action between the two, resulting in a mold release state, and the molded material W, which is not electrolytically released, passes through the air-permeable insulator 15. Since compressed air is supplied to the mouth edge, this compressed air allows the upper mold 8 to rise and release smoothly without damaging the mouth edge, thereby improving the molding process in conjunction with the electrical release action. The shape of the molded base W, especially the easily damaged edge, can be reliably released from the mold, and therefore tableware can be molded by using a metal upper mold 8, instead of using a plaster mold, etc.
Since pressure molding can be performed in a sealed manner using the lower mold 10, the life of the mold can be greatly improved, and there is no need to have multiple molds, which can improve work efficiency and quality. Its practical effects are enormous.

[Brief explanation of drawings]

The figure shows one embodiment of the present invention.
The figure is a cross-sectional view of the main parts of a press molding machine, Figures 2 to 5 are diagrams showing the method of molding tableware by electric release molding according to the present invention, and Figures 6 and 7 are diagrams showing other embodiments. FIG. 1...Press molding machine, 2...Press ram, 4...
...rotating shaft, 8... upper die, 10... lower die, 12...
Table, 14... lip molding part, 15... insulator, 17... air supply path, 21... first DC power supply section, 23... second DC power supply section, 24... suction head.

Claims (1)

[Claims] 1 A molding base of a predetermined shape is pressurized and molded in a hermetically sealed manner by a lower mold made of metal for molding tableware and an upper mold made of metal, and when the upper mold is released, a first DC power source is applied to the upper mold. Connect the negative electrode of the part to the positive electrode of the lower mold, and when releasing the molded base from the lower mold,
In a press molding device in which the positive electrode of the second DC power source is connected to the adsorption head for taking out the molded material, and the negative electrode thereof is connected to the lower mold, the upper mold is connected to the rim forming part of the molded material from the joint with the lower mold. In addition to intervening a breathable insulating material such as gypsum, a communicating path was formed to communicate the air supply path and the insulating material, and a pipe through which compressed air was supplied was connected to the communicating path. Features a mold release device in press molding equipment for tableware.