CN201169034Y - Cold runner rubber injection molding mold - Google Patents

Abstract

The utility model relates to a cold runner rubber injection molding mold in the field of rubber and plastic processing and manufacturing. A heating plate is installed on the fixed mold. The heat insulation plate is installed between the heating plate and the cold runner plate. Below the runner plate, there is an air gap between the combined nozzle and the heating plate; the cold runner plate is composed of an upper runner plate and a lower runner plate, and the groove on the lower plane of the upper runner plate is formed by the groove on the lower plane of the lower runner plate. The first layer of runners; the upper surface of the combined nozzle has more than two radially distributed grooves, and the grooves corresponding to the lower plane of the cold runner plate form the second layer of runners; the nozzle body is provided with two Above the step hole, there is a floating nozzle in the step hole; the cold runner plate is provided with a heat conduction hole for the flow medium; the combined nozzle is provided with a longitudinal groove for the flow heat conduction medium, and the longitudinal groove communicates with the heat conduction hole of the cold runner plate , The utility model has the advantages of simple structure and principle, good product quality, high production efficiency, saving raw materials and manpower.

Description

Cold runner rubber injection molding mold

Technical field:

The utility model relates to a rubber injection molding mold including a movable mold and a fixed mold in the field of rubber and plastic processing and manufacturing, in particular to a cold runner rubber injection molding mold.

Background technique:

The current rubber injection molding method is to inject the plasticized rubber material into the cavity of the mold for vulcanization molding, so the mold is equipped with a pouring system. The plasticized rubber is injected into the mold cavity through the gating system, and then vulcanized. Ordinary rubber injection molding molds heat and vulcanize the rubber in the gating system and the rubber in the cavity together during the vulcanization molding process. After the mold is opened, the vulcanized rubber in the gating system becomes waste and is thrown away. Every injection will generate some waste. The amount of waste generated by each injection is related to the number of cavities. For single-cavity molds that form large parts, the amount of waste generated accounts for a small proportion of the amount of parts used, but For multi-cavity molds that form small parts, the amount of waste generated accounts for a large proportion of the amount of parts used. Especially for high-precision small parts that require multi-gate injection, in addition to setting runners according to the number of cavities, each cavity also needs to add runners according to the number of gates, so the number of runners increases. The result is that the waste generated by each injection is multiplied, resulting in a great waste of raw materials. In addition to causing waste of raw materials, the rubber in the runner also consumes a considerable part of heat energy during the high-temperature vulcanization process. In addition, taking waste materials needs to be done manually, and the labor intensity of workers is high. Mold opening and waste removal require a larger mold opening stroke and more mold opening time, which also leads to prolongation of the molding cycle and affects production efficiency.

Invention content:

The purpose of this utility model is to overcome the shortcomings in the prior art, and to design and provide a cold runner rubber injection molding mold with multiple cavities and multiple gates, which is used for high-yield, high-quality molding of small rubber parts , to solve the defects existing in the existing common rubber injection mold.

In order to achieve the above object, the cold runner rubber injection molding mold involved in the utility model includes a movable mold, a cavity, a fixed mold, a thermocouple, an electric heater, a heating plate, a nozzle jacket, a longitudinal groove, a nozzle body, a stepped hole, Floatable nozzles, heat conduction holes, heat shields, upper runner plates, lower runner plates, grooves, straight holes and air gaps, a heating plate is installed on the fixed mold, and the heat shield is installed between the heating plate and the cold runner plate , the combined nozzle is installed under the cold runner plate, and there is an air gap between the combined nozzle and the heating plate; the cold runner plate is composed of an upper runner plate and a lower runner plate, and the groove on the lower plane of the upper runner plate and the lower runner The flat grooves on the plate form the first layer of flow channels; the upper end surface of the combined nozzle has more than two radially distributed grooves, and the grooves corresponding to the lower plane of the cold runner plate form the second layer of flow channels; The combined nozzle includes a nozzle body, a nozzle jacket and a floatable nozzle. There are more than two stepped holes on the nozzle body, and a floatable nozzle is installed in each stepped hole; the cold runner plate is equipped with a heat conduction hole for the circulating medium; The combined nozzle is provided with longitudinal grooves for the circulation of heat-conducting medium, and the longitudinal grooves communicate with the heat-conducting holes of the cold runner plate.

The utility model controls the temperature of the rubber material in the mold cavity and the flow channel respectively through the heating plate and the cold flow channel plate. During vulcanization, the heating plate heats the rubber in the cavity at high temperature to make it vulcanized and formed. At the same time, the cold runner plate controls the rubber in the runner below the vulcanization temperature to keep it in a flowable state , when the mold is opened, only the parts are taken out, and the rubber in the flow channel remains in the flow channel, and these materials are injected into the cavity and vulcanized into the parts in the next injection. No waste is produced during the entire molding process, and the heat energy consumed by the rubber in the runner is also very small. Therefore, compared with the prior art, the utility model can not only carry out high-yield and high-quality production of small parts, but also save raw materials and energy, improve production efficiency, and reduce labor intensity of workers.

Description of drawings:

Fig. 1 is the structural principle schematic diagram of the utility model.

Fig. 2 is a schematic diagram of a partially enlarged structure of the utility model.

Fig. 3 is a schematic diagram of a top view structure of the combined nozzle of the present invention.

Detailed ways:

Below by embodiment and in conjunction with accompanying drawing, the utility model is further described.

Example:

The main structure of this embodiment includes a movable mold 1, a cavity 2, a fixed mold 3, a thermocouple 4, an electric heater 5, a heating plate 6, a nozzle cover 7, a longitudinal groove 8, a nozzle body 9, a stepped hole 10, and Floating nozzle 11, heat conduction holes 12 and 14, heat insulation plate 13, upper runner plate 15, lower runner plate 16, grooves 17, 18, 20 and 21, straight holes 19 and air gap 22, movable mold 1 and fixed mold 3 The cavity part 2 constituting the cold runner rubber injection molding mold, the heating plate 6 is installed on the fixed mold, and there are a plurality of through holes in the heating plate, and the electric heater 5 is installed in the hole to realize the heating of the molding part of the mold. A thermocouple 4 is installed at the center of the heating plate, and the thermocouple is connected with a temperature control instrument for temperature measurement and temperature control of the heating plate. The heat insulation board 13 is installed between the heating plate and the cold runner plate to prevent the heat of the heating plate 6 from being transferred to the cold runner plate.

The cold runner plate is made up of an upper runner plate 15 and a lower runner plate 16, and the upper runner plate and the lower runner plate are fixed together with screws and positioned with pins. A groove 17 is formed on the lower plane of the upper channel plate, and a groove 18 corresponding to the groove 17 is formed on the upper plane of the lower channel plate. The grooves 17 and 18 constitute the first layer of flow channels. The upper runner plate and the lower runner plate are respectively provided with heat conduction holes 12 and 14, the heat conduction holes are distributed in series and connected, and are divided into two groups of channels with the center line of the cold runner plate as the axis of symmetry. Through the temperature control system to control the temperature of the circulating medium in the heat conduction hole, the rubber in the flow channel is controlled below the vulcanization temperature to keep it in a flowable state.

The combined nozzle is fixed under the cold runner plate with screws and positioned with pins; the upper end surface of the combined nozzle is provided with a groove 21, and the groove 20 corresponding to the lower plane of the cold runner plate constitutes the second layer of runners. The grooves 21 are distributed radially, as shown in Figure 3; the combined nozzle combines four nozzles in one cavity to make it compact in structure, so as to solve the problem of small space for multi-point injection of small parts; the combined nozzle It consists of a nozzle cover 7, a nozzle body 9 and a floating nozzle 11; the nozzle body 9 is provided with four stepped holes 10, and a floating nozzle 11 is installed in each stepped hole, and the floating nozzle 11 and the stepped hole 10 are clearance fit , under the action of material pressure, the floating nozzle 11 can always keep in contact with the fixed mold 3 to prevent the rubber material from leaking; the combined nozzle is provided with a longitudinal groove 8 connected in series, which is used to feed the heat-conducting medium and control the nozzle body 9 The temperature of the rubber material inside keeps it in a flowable state; the longitudinal groove 8 communicates with the heat conduction hole 14 of the cold runner plate through the straight hole 19 of the nozzle jacket 7; the lower plane of the cold runner plate is connected to the nozzle jacket 7 A sealing ring is installed between the upper end faces to prevent the leakage of heat transfer medium.

The combined nozzle and the heating plate 6 are thermally insulated by an air gap 22 .

Claims (3)

1. cold runner injection molding of rubber mould, comprise fixed half and moving half, it is characterized in that being installed with above the cover half heating plate, thermal insulation board is installed between heating plate and the cold flow guidance tape, combined nozzle is installed in below the cold flow guidance tape, is provided with the air gap between combined nozzle and the heating plate; The cold flow guidance tape is made up of upper reaches guidance tape and dirty guidance tape, and the groove on plane constitutes the ground floor runner on the groove of upper reaches guidance tape lower plane and the dirty guidance tape; The upper surface of combined nozzle has the groove that distributes radially more than two, and the groove corresponding with cold flow guidance tape lower plane constitutes second layer runner; But combined nozzle comprises nozzle body, nozzle overcoat and floating nozzle, and nozzle body is provided with stepped hole, but a floating nozzle is installed in each stepped hole.

2. cold runner injection molding of rubber mould according to claim 1 is characterized in that the cold flow guidance tape is provided with the thermal hole of circulation medium.

3. cold runner injection molding of rubber mould according to claim 1 is characterized in that combined nozzle is provided with the longitudinal groove of circulation heat-conducting medium, and longitudinal groove communicates with cold flow guidance tape thermal hole.

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