Cold runner injection molding of rubber mould
The utility model relates to a kind of injection molding of rubber mould that comprises dynamic model and cover half in the rubber and plastic processing and manufacturing field, particularly a kind of cold runner injection molding of rubber mould.
Present injection molding of rubber method is to be injected into and to carry out sulfidization molding in the mold cavity plastifying sizing material, so is provided with running gate system in the mould.Plastified sizing material and be injected in the mold cavity by running gate system, and then sulfidization molding.The General Purpose Rubber injecting molding die is that the vulcanizate after the die sinking in the running gate system becomes waste material and thrown away with the sizing material in the running gate system and the sizing material in die cavity baking together during sulfidization molding.Capital of every injection produces some waste materials, the waste material amount that per injection produced is relevant with the die cavity number, monotype cavity mould for the big product of moulding, it is less that the waste material amount that produces accounts for the ratio of product materials amount, but for the multi-imprssion mould tool of the little product of moulding, the waste material amount of generation accounts for the large percentage of product materials amount.Especially moulding needs the high accuracy small piece of many cast gate injections, and except that being provided with the runner by the die cavity number, each die cavity also needs to set up runner in addition again by the cast gate number, so the runner number increases.The result is that the waste material that every injection is once produced is multiplied, and has caused raw-material very big waste.Except that causing waste of raw materials, the sizing material in the runner has also consumed sizable a part of heat energy in high temperature vulcanized process.In addition, get waste material and need manually finish, labor strength is big.Waste material is got in die sinking needs bigger opening stroke and more die sinking time, has therefore also caused the prolongation of molding cycle, has influenced production efficiency.
Summary of the invention:
The purpose of this utility model is to overcome the shortcoming that exists in the prior art, design provides the cold runner injection molding of rubber mould of a kind of a multi-cavity mold, the many cast gates in a chamber, be used for high yield, the small-sized rubber part of high-quality moulding, to solve the defective that existing General Purpose Rubber injecting molding die exists.
To achieve these goals, but the cold runner injection molding of rubber mould that the utility model relates to comprises dynamic model, die cavity, cover half, thermocouple, electric heater, heating plate, nozzle overcoat, longitudinal groove, nozzle body, stepped hole floating nozzle, thermal hole, thermal insulation board, upper reaches guidance tape, dirty guidance tape, groove, straight hole and the air gap, heating plate is installed above the cover half, 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 plural stepped hole, but a floating nozzle is installed in each stepped hole; The cold flow guidance tape is provided with the thermal hole of circulation medium; Combined nozzle is provided with the longitudinal groove of circulation heat-conducting medium, and longitudinal groove communicates with cold flow guidance tape thermal hole.
The utility model carries out temperature control to the sizing material in die cavity and the runner respectively by heating plate and cold flow guidance tape.Between curing time, heating plate carries out the high temperature heating to the sizing material in the die cavity, make its sulfidization molding, meanwhile, the cold flow guidance tape is controlled at the sizing material in the runner below the curing temperature, and it is remained under the flowable state, only takes out product during die sinking, sizing material in the runner still is retained in the runner, and these sizing materials are injected into die cavity and are sulfided into product when injecting next time.No waste material produces in whole forming process, and the heat energy that sizing material consumes in the runner also seldom.Therefore the utility model compared with prior art not only can carry out high yield, the high quality of production of little product, but also can economize in raw materials and the energy, enhances productivity, and alleviates labor strength.
Description of drawings:
Fig. 1 is a structural principle schematic diagram of the present utility model.
Fig. 2 is a local structure for amplifying principle schematic of the present utility model.
Fig. 3 is the plan structure principle schematic of combined nozzle of the present utility model.
The specific embodiment:
Also the utility model is described in further detail in conjunction with the accompanying drawings below by embodiment.
The agent structure of present embodiment comprises dynamic model 1, die cavity 2, cover half 3, thermocouple 4, electric heater 5, heating plate 6, nozzle overcoat 7, longitudinal groove 8, nozzle body 9, stepped hole 10, but floating nozzle 11, thermal hole 12 and 14, thermal insulation board 13, upper reaches guidance tape 15, dirty guidance tape 16, groove 17,18,20 and 21, straight hole 19 and the air gap 22, dynamic model 1 and cover half 3 constitute the die cavity part 2 of cold runner injection molding of rubber moulds, heating plate 6 is installed in above the cover half, be provided with a plurality of through holes in the heating plate, electric heater 5 is housed in the hole, realization is to the heating of mould molding part, thermocouple 4 is equipped with in the heating plate center, thermocouple links to each other with the temperature control instrument, is used for the thermometric and the temperature control of heating plate.Thermal insulation board 13 is installed between heating plate and the cold flow guidance tape, transmits to the cold flow guidance tape with the heat that stops heating plate 6.
The cold flow guidance tape is made up of upper reaches guidance tape 15 and dirty guidance tape 16, and upper reaches guidance tape and dirty guidance tape are screwed together, and locate with pin.Have groove 17 on the lower plane of upper reaches guidance tape, have the groove 18 corresponding with groove 17 on the last plane of dirty guidance tape, groove 17 and 18 constitutes the ground floor runners.Upper reaches guidance tape and dirty guidance tape are respectively equipped with thermal hole 12 and 14, and thermal hole be communicated with to distribute for series connection, and are that symmetry axis is divided into two groups of passages with cold flow guidance tape center line.By the temperature control of temperature-controlling system to circulation medium in the thermal hole, sizing material in the runner is controlled at below the curing temperature, it is remained under the flowable state.
Combined nozzle is screwed below the cold flow guidance tape, and positions with pin; The upper surface of combined nozzle has groove 21, and the groove 20 corresponding with cold flow guidance tape lower plane constitutes second layer runner, and groove 21 distributes radially, as shown in Figure 3; Combined nozzle lumps together four nozzle sets of a die cavity, makes its compact conformation, to solve the little problem in little product multi-point injection space; But combined nozzle is made up of nozzle overcoat 7, nozzle body 9 and floating nozzle 11; Nozzle body 9 is provided with four stepped holes 10, but a floating nozzle 11 is installed in each stepped hole, but floating nozzle 11 be a matched in clearance with stepped hole 10, under the effect of material pressure, but floating nozzle 11 can remain with cover half 3 and contact, with the leakage of prevention sizing material; Combined nozzle is provided with the longitudinal groove 8 that series connection is communicated with, and is used to feed heat-conducting medium, and the sizing material temperature in the control nozzle body 9 remains under the flowable state it; Longitudinal groove 8 communicates with the thermal hole 14 of cold flow guidance tape by the straight hole 19 of nozzle overcoat 7; Between the upper surface of cold flow guidance tape lower plane and nozzle overcoat 7, sealing ring is installed, reveals to prevent heat-conducting medium.
Between combined nozzle and the heating plate 6 by the air gap 22 thermal insulation.