JP2011037252A - Injection molding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the following problems in an injection molding device that it is difficult to obtain a stable product for a long period of time, that it is difficult to increase productivity because it is conventional to clean a die after stopping working for a predetermined time, that it is extremely difficult to keep qualities of a product, and that further it is difficult to mold from different materials and to mold a product having a size over a given limit length. <P>SOLUTION: Conventional insert dies at a fixing side and at a moving side facing each other to form a cavity part are equipped with a heating means, a cooling insert die at a fixing side separably connecting to the insert die at the fixing side and a cooling insert die at moving side separably connecting to the insert die at the moving are equipped with a cooling means, and a temperature around a cavity part is kept under best conditions for connection and separation of each insert die and each cooling insert die, whereby improvement of qualities of an injection molded product and shortening of a time for maintenance of a device can be attained. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

      In the present invention, when injection molding is performed using plastic, metal, or other raw material that can be melted by heating, mold temperature control and degassing inside the mold are performed in parallel to improve the quality of the molded product. The present invention relates to an injection molding apparatus that ensures a safe state.

      Injection molding technology for obtaining molded products by filling molten raw materials into molds prepared in advance has been used for a long time, and as a technology that is indispensable for modern mass production technology, various technological improvements have been repeated year by year. With regard to the temperature control, it has been attempted to consider forming a product having a good finish continuously over a long period of time.

The results of such efforts can be found in the following patent literature, but in any case encompass various problems that cannot be solved in practice.
JP-A-7-195472 JP-A-8-290452

      Sanei Mold Co., Ltd., one of the applicants of the present application, has acquired patents No. 4085182 and No. 4096327 in the past, and provided an effective gas venting means inside the mold during injection molding. With these technologies, the continuous operation time of the molding machine has been extended, the number of maintenance operations has been dramatically reduced, and a significant improvement in the surface finish of injection molded products using conventional materials has been ensured.

      However, there is an ever-increasing demand to apply to injection molding the use of materials that were previously considered unmanufacturable as products that could not be manufactured or used.

      The inventors of the present invention have established the technology for effectively removing the gas in the cavity by the above two patents. In order to use injection molding technology in a wide range of fields by freely selecting and combining materials that were difficult to perform, appropriate temperature control of the mold by inexpensive means in parallel with reliable degassing A conclusion has been reached that it is necessary to use techniques that can be done.

      However, the technical contents of mold temperature management at the time of work currently provided do not go out of the idea of preheating the mold, so that sufficient results cannot be obtained for injection molding work. As a result, it was important to pursue the direction of using special refrigerants or applying special cooling devices. The result is produced.

      In the present invention, water temperature is used for cooling the mold, and an electric heater is used for heating the mold, thereby making it possible to control the temperature of the mold inexpensively and reliably.

      The main part of the mold is composed of a fixed side insert and a movable side insert opposite thereto, and a melted material is filled in a recess formed between them to obtain a molded product in the recess. However, a heating means for heating the inserts is buried in each of these two inserts.

      Further, the fixed-side insert is brought into contact with the fixed-side cooling insert in a separable state, and the movable-side insert is brought into contact with the movable-side insert in a separable state. These two cooling inserts are provided with cooling means by circulating water or the like.

      The temperature of the mold is most desirable for the finished product in accordance with the operation of the injection molding machine that operates the heating means and cooling means, matches the mold, fills the material, separates the mold and discharges the product Thus, an injection molding apparatus capable of continuous operation for a long time is obtained.

      According to the present invention, it is possible to control the temperature of a mold at low cost, easily and reliably using electric heat and water, and it is possible to obtain an injection molding apparatus capable of stably finishing a product and shortening maintenance time. effective.

It is sectional drawing of the state which closed the metal mold | die of this invention. FIG. 2 is a cross-sectional view of the state shown in FIG. 1 in which a fixed side insert and a fixed side cooling insert are separated. FIG. 3 is a cross-sectional view showing a state in which the movable side insert and the movable side cooling insert shown in FIG. 2 are separated. FIG. 4 is a cross-sectional view of the state shown in FIG. 3 in which a fixed side insert and a movable side insert are separated. It is sectional drawing of the state which discharges the product in the cavity part of what is shown in FIG. 4, and resin in the runner part continuous with it.

      In the present invention, the fixed side and the movable side inserts face each other, heating means are installed on the fixed side insert and the movable side inserts, respectively, and the fixed side cooling insert is also inserted into the fixed side insert. The movable side cooling inserts are brought into contact with the child, and cooling means are installed in each cooling insert. The fixed side cooling insert, the fixed side insert, the movable side insert, and the movable side cooling insert. It is possible to form a cavity part to obtain a product by injection molding by tightening together, making the inserts separable, and operating the heating means and cooling means and combining and separating the inserts Control the ambient temperature.

      An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a movable side insert fixed to a movable side main body 2, and in the case of the embodiment, includes a movable side heating means 3 utilizing electric heat. Reference numeral 4 denotes a fixed-side insert attached to the fixed-side main body 5, and in the case of the embodiment, includes a fixed-side heating means 6 using electric heat.

      Reference numeral 7 denotes a movable side cooling insert fixed to the movable side back plate that contacts the movable side body 2 in a separable manner and arranged to contact the movable side insert 1 in a separable manner. A movable-side cooling means 9 is provided by circulating cooling water. Reference numeral 10 denotes a fixed-side cooling insert fixed to the fixed-side back plate 11 detachably contacting the fixed-side main body 5 and arranged to contact the fixed-side insert 4 detachably. Includes a fixed-side cooling means 12 by circulating cooling water.

      A fixed-side mounting plate 13 is fixed to the fixed-side back plate 11 and is supported by the fixed-side mounting plate 13, and the fixing-side mounting plate 13, the fixed-side back plate 11, the fixed-side cooling insert 10 and the fixed-side insert 4 are arranged. A primary sprue 15, a primary gate 16, and a secondary sprue 17 are continuously drilled in the sprue bush 14 that penetrates, and the end of the secondary sprue 17 is formed by the movable side insert 1 and the fixed side insert 4. The runner portion 18 is connected to a cavity portion 20 formed by the movable side insert 1 and the fixed side insert 4 via a secondary gate 19. In the present invention, the primary gate 16 is provided between the primary sprue 15 and the secondary sprue 17. By narrowing the inner diameter of the primary sprue 15 by the primary gate 16, the above-mentioned Japanese Patent Nos. 4085182 and 4096327 are disclosed. Application has been implemented. The same application as this is applied to the gas suction groove 21 continuing to the cavity portion 20.

      Reference numeral 22 denotes a runner push-out pin which is placed on the lower ejector plate 24 facing the movable side mounting plate 23 and supported by the upper ejector plate 25. The movable side back plate 8, the movable side cooling insert 7 and the movable side insert 1 The degassing end portion 26 penetrating through the surface faces the runner 18, and degass the runner portion 18 and discharges the material filled in the runner portion 18. In the figure, reference numeral 27 denotes a cast pin installed in the movable side insert 1. Reference numeral 28 denotes an extruding pin that operates in cooperation with the runner extruding pin 22 to discharge the product completed in the cavity portion 20 to the outside of the mold.

      The operation of the apparatus is as follows. After the mold sprung state shown in FIG. 1 is filled with the molten material from the primary sprue 15 and the product is completed in the cavity portion 20, first, as shown in FIG. The fixed cooling insert 10 is separated.

      Next, the movable side insert 1 and the movable side cooling insert 7 are separated as shown in FIG. 3, and then the fixed side insert 4 and the movable side insert 1 are completely separated as shown in FIG. The product is taken out by the runner push pin 22 and the push pin 28.

      During these operations, when each nest and each cooling nest are in contact, the temperature rise of the nest is suppressed, and when they are separated from each other, the temperature of the nest rises. In addition, by controlling the heating means of the insert and the cooling means of the cooling insert, the most desirable insert temperature for material filling and product cooling can be secured and maintained.

      According to the present invention, it is possible to freely control the temperature of the nesting part of the mold in parallel with the reliable degassing, so any material that is molten can be injection molded. Since the finish of the entire product and the perfection of the product surface can be easily achieved, the present invention can be applied to all mass production by injection molding.

      With the injection molding machine of the structure shown in this example, detailed temperature management data was obtained using most of the materials currently used and various additional materials mixed in them, but the product surface was simply In addition, the finish of the back surface can be controlled most desirably, and the present invention can be used to ensure the molding of materials that have been thought to be difficult to mold and products of size and thickness that were previously considered difficult to mold. It was confirmed that it would be possible.

DESCRIPTION OF SYMBOLS 1 Movable side insert 2 Movable side main body 3 Movable side heating means 4 Fixed side insert 5 Fixed side main body 6 Fixed side heating means 7 Movable side cooling insert 8 Movable side back plate 9 Movable side cooling means 10 For fixed side cooling Insert 11 Fixed side back plate 12 Fixed side cooling means 13 Fixed side mounting plate 14 Sprue bush 15 Primary spru 16 Primary gate 17 Secondary spru 18 Runner part 19 Secondary gate 20 Cavity part 21 Gas suction groove 22 Runner push pin 23 Movable side mounting plate 24 Lower ejector plate 25 Upper ejector plate 26 Degassing end portion 27 Casting pin 28 Extrusion pin

Claims (2)

      In the injection molding apparatus, a movable side cooling insert and a fixed side, which are provided with heating means respectively on the movable side insert and the fixed side insert that face each other to form a cavity portion, are detachably contacted with the movable side insert. An injection molding apparatus characterized in that a cooling means is provided for each fixed side cooling insert that comes into contact with the insert in a separable manner.       2. An injection molding apparatus according to claim 1, wherein the heating means is electric heat and the cooling means is water.

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