TW201031512A - Heating and cooling structure for mold - Google Patents

Abstract

A heating and cooling structure for a mold comprises a heat insulating layer disposed surrounding and at the bottom of a die impression of the die base for insulating the heat conduction between the die base and a die core; at least one support post disposed between the die core and the heat insulating layer for supporting the insert; and a coil surrounding the support post which has a current inlet and a current outlet. The bottom of the die core and the heat insulating layer define a cooling space into which cooling fluid can be introduce. The support post and the coil are disposed in the cooling space for reinforcing the strength of the mold to avoid the die core from bending and deforming and the production of a large amount of defective products by injection molding, thereby lowering the defect rate. In addition, the support post and the die core can be directly contacted and have the same material, such that the heat of the die core and the support post can be removed during heating or cooling, thereby increasing the heating and cooling efficiency.

Description

.201031512 'Six, invention description: [Technical field to which the invention pertains] - The present invention relates to a heating and cooling structure for a mold, which refers to a support column supported by a uniform sentence, and The mold core and the support column are directly contacted with the cooling fluid of the cooling space to achieve uniform heating, strong mold strength, and rapid cooling of the heating and cooling structure. • [Prior Art] According to the 'plastic molding method', it is divided into injection molding, blow molding, hot press molding, compression molding, extraction molding, etc., in which the plastic products produced by injection molding can be in shape, from simple The cups can be made into complex car dashboards, and the size can range from 0. 01 gram clock pinions to over 2 〇 kg baths. It has the advantages of complex structure, precise size, and quality stability. The most important and most common use technology in molding methods; the commonly used materials are roughly polyethylene (ΡΕ), polypropylene (ΡΡ), polyethylene (pvc), polystyrene (ps) and acrylonitrile. (ABS) and so on. The above-mentioned injection molding, compression molding, hot press molding and the like are all heated to a molten state of the plastic and filled into the cavity, and the plastic coated mold is cooled and solidified by a specific structure to replicate the mold structure, and the temperature of the general mold. They are all smaller than the conversion temperature of the plastic glass, so that the molten plastic forms a solidified layer when it contacts the surface of the cavity. The ratio of the thickness of the solidified layer to the thickness of the finished product increases as the thickness of the finished product decreases. When the proportion of the solidified layer is too high, It will make it difficult to fill the melted plastic, causing short shots, complicated structural replication, and residual 201031512 'remaining stress and other problems. In addition to the injection unit (extrusion machine), electronic control and hydraulic system, the injection molding machine mainly uses a clamping unit (also known as a clamping unit) as the main molding device when the melt is cooled and formed; the clamping unit The first clamping part and the second clamping part (also referred to as a head plate and a tail plate) which can be locked or opened by a phase closure are respectively arranged on the first clamping part seat and the second clamping piece seat respectively. After the module of the master mold, the first clamping seat and the second clamping seat are closed and locked (closed), and then the filling and cooling forming process can be performed. • During the injection molding process, when the molten rubber is injected into the cavity of the male and female modules, the high-temperature melt rubber contacts the cooled cavity wall to form a thin solidified layer, and the temperature of the melt near the wall is also This will be reduced, so that the flow rate of the melt is maximum at the center position, and the flow rate near the wall is almost zero. In the case where the flow rate of the molten rubber is inconsistent in the cavity of the male and female modules, if the male and female modules are complicated in structure, turbulent flow will be formed, so that the water ripples and the bonding wires are easily formed on the finished plastic parts, and then The air in the upper part of the cavity is too late to discharge the bubbles formed, which makes the appearance of the finished product more serious. In response to the trend of demand for modern products, the design requirements for plastics are becoming thinner and thinner, and even for special needs, small structures such as backlights, fiber optic connectors, etc. must be designed; if manufactured by conventional injection molding processes It will not be able to be successfully completed due to the solidification layer and plastic fluidity. Therefore, in recent years, a method for rapidly heating the cavity temperature has been developed, and some inventions have been developed to shorten the process cycle time and develop a rapid cooling method. The heating method of the present invention can be roughly classified into a steam type, a resistance type, and a high frequency type. The following only lists the resistance type and the high circumference 201031512, and the wave type is briefly described. Please refer to the national patent No. M317917, which discloses a heating and cooling device for a mold, wherein the first and second clamping blocks are locked to each other, so that the first and second clamping blocks are closed. When the glue is injected into the cavity space between the first module and the first module, the power supplied by the power cable causes the heater to generate high heat instantaneously, and the rubber in the cavity space can be heated by the conduction of the second module. , so that the flow rate of the melt into the cavity space of the second and second modules can be as uniform as possible to avoid turbulent flow' and thereby eliminate the appearance of water ripples, bubbles and knots on the finished product. . However, although this method can quickly increase the cake temperature, the heat generated by the heater will spread to all the templates on the four sides. When the heat is transferred to the surface of the rubber compound, a large amount of heat source loss is caused. The efficiency is lowered, and the heat is close to the heater, which is higher, and the heat away from the heater is lower, so that the heat distribution is not uniform, and the flow rate of the melt is still inconsistent. Please refer to the invention patent No. 1279304, which discloses a method and a device for rapidly heating the surface of a mold by a high-frequency induction current. The coil guide hole is arranged close to the heating surface of the mold, and the coil is surrounded by the heating surface, and the high frequency is passed. The current is on the coil and will be exactly the same due to the change in current direction. The magnetic stagnation and eddy current damage occur in the surrounding metal block, and the coil is hoisted up to reach the surface temperature of the mold, and the cooling hole is buried near the coil guide hole, and the cooling hole is inserted into the coil. The mold plus liquid 'takes away the extra body produced by the mold and the coil or cools the cooling, adjusts the cooling hole arrangement position and the cooling gas, or speeds the mold to control the temperature of the mold. Or the liquid temperature and flow are heated by the high-frequency method, so the distance between the coils 201031512 'must be controlled. If the distance between the coils is set too close for uniform heating, the current between them is generated. The magnetic fields will affect each other and cause a decrease in heating effect. If the distance between the coils is too far, the heating will be uneven, resulting in inconsistent flow rates of the melt. Further, due to the gravity of the gravity and the stress of the mold itself, a slight bending deformation occurs in the center portion of the mold, so that the problem of an increase in the defective rate is caused at the time of injection molding. Therefore, how to uniformly add heat to the mold (mould) in a high-frequency manner, and can be rapidly cooled to reduce the heating and cooling time, and at the same time increase the strength of the mold, which is currently a uniform heating and cooling structure for the mold. A topic that cannot be delayed. SUMMARY OF THE INVENTION In view of the above, the first object of the present invention is to support the mold core by the structure of the support column, and to strengthen the strength of the mold to avoid bending deformation of the mold core, resulting in an increase in the defective rate of the finished product. A second object of the present invention is to wind a support column with a coil to simultaneously heat the mold core and the support column, so that the heat of the branch column is conducted to the mold core to improve the heating efficiency. A third object of the present invention is to define a cooling space by the bottom of the mold core and the heat insulating layer, so that when the cooling fluid passes through the cooling space, the heat of the mold core and the support column is taken away to achieve the cooling effect. The fourth object of the present invention is that the mold core is in contact with the support column, and when the cooling fluid passes into the cooling space, the heat of the mold core can be carried away through the support column and the cooling 201031512 - fluid to improve the cooling efficiency. The fifth object of the present invention is to support the mold by using a structure supporting the crucible, thereby reducing the thickness of the mold core, reducing the overall thickness, and further increasing the cold and heating efficiency. In order to achieve the above object, the present invention provides a heating and cooling structure for a mold, the mold comprising a mold base and a mold core, the mold base having a cavity for placing the mold core, and the mold The anode has a cavity, and the heating and cooling structure is disposed between the die holder and the mold core, and comprises: a heat insulation layer disposed around the bottom surface and the bottom surface of the cavity for isolating the mold base and the mold Heat transfer between the keles; at least one pillar disposed between the mold core and the insulating layer to support the mold core; and a coil surrounding the support column, having a current input port and a current input port Wherein the bottom of the mold core and the heat insulation layer define a cooling space for introducing a cooling fluid, and the branch column and the coil system are disposed in the cooling space. Preferably, the coil is a hollow copper tube covered by an insulating material, and has a fluid line for introducing the cooling fluid. Preferably, the at least-support column is a plurality of support columns, uniformly distributed in a cooling space between the mold core and the heat insulation layer, and the coil is coupled to the axial direction of the support columns. Fangnan' is wound around each support column at different levels. Preferably, the at least one support column is a single-support column, which is disposed at a central portion of the heat insulation layer, and the coil surrounds the support column and is horizontally laid on the heat insulation layer at the same horizontal plane. ^ Preferably, in addition to each of the support columns and the corresponding coils, there is a magnetic powder layer sleeve, the magnetic powder layer sleeve has a plurality of holes for the 201031512 corresponding coil through and water supply flow Circulation. And f2 when the high-frequency current is applied to the line 以' to generate a magnetic field to avoid the possibility of the mold core; the second two; ^ column setting, not only the mold directly and the material rate, but also by the column and = =: effect; quickly raise or remove the heat of the mold, point: ==== the detailed characteristics and excellent content and implement according to the 'and the technical scope and illustration of this book according to this description, any cooked f phase _ artist, Shen eye special purpose and advantages. The present invention will be readily understood by the following aspects. [Embodiment] The preferred embodiment (4) of the present invention will be described below with reference to the drawings. Here, the description will be made first to generate heat in a high-frequency manner.

Winding on -conductor C, and in the coil a forbearing diagram, -coil R too pile macro (four) seven people "" seven plants ~ high frequency power supply S, in the special U upwards to produce foreign material M cut to produce magnetic flux changes two The speed of mutual movement is expressed as: This ratio can be as follows: 201031512

'Td</> , dN , β = -Ν—^-νφ — dt dx where e is the induced electromotive force (Volt), w: the number of turns of the coil (匝, Turn), ^: flux (Weber, Wb)' u: speed (m / s, m / s), this electromotive force causes current (ie eddy current E), the power generated by the internal flow of the conductor, according to Joule's law can be written as two meters wide / /2, of which , 怂 is Volumetric Power Density (W/m3), p is the material resistivity (Resistivity, Ωπι) 'J is Current Density (Win A/m2). The non-contact type electromagnetic induction between the coil R and the conductor C, due to the hysteresis loss caused by the reciprocating motion of the conductor C via magnetization, demagnetization, and remagnetization, causes the workpiece to generate thermal energy to reach The temperature rises. The larger the area enclosed in the hysteresis curve, the larger the value of the coercive force He and the remanence Br. The magnetic hysteresis loss is of course higher, and the empirical formula for magnetic hysteresis loss is A=A·/·圮, where Λ : the hysteresis loss of the workpiece, A: hysteresis coefficient, / : frequency (Hz), 圪: Maximum flux density φ (T), X: material factor, ": workpiece volume (m3). The high-frequency power supply provides different frequency AC current through the coil R, and generates an induced electromotive force due to electromagnetic induction. This electromotive force will generate an eddy current E on the workpiece, and is non-uniform and non-equal flow in each section of the workpiece. 》The workpiece will generate heat due to the resistance. 5 This full-flow phase is the same as the above-mentioned hysteresis loss, and is finally expressed in the form of “hot” on the object to be heated. The eddy current loss is = _ (5_·/ · ί) 2, where: eddy current loss per unit weight (W/kg), 5max: maximum flux density (Τ), /: operating frequency (Hz), I: eddy current loss proportional constant, / : heating object Thickness (m). 201031512 Please refer to FIG. 2 and FIG. 3, which are respectively an exploded structural view and a cross-sectional view of a first embodiment of the present invention; the mold 2 of the present embodiment includes a mold base 21 and a mold core 22, and the mold base 21 has a The cavity 211 is for placing the mold core 22, and the mold core 22 is large in size and has a cavity 221. The heating and cooling structure 1 of the present embodiment is disposed between the mold base 21 and the mold core 22, and includes a heat insulating layer 11, a plurality of support columns 12, and a coil 13.

The heat insulation layer 11 is disposed on the cavity 211 of the mold base 21, that is, the heat insulation layer 11 is laid on the periphery and the bottom surface of the mold cavity 211 to isolate the heat transfer between the mold base 21 and the mold core 22. The heat energy is concentrated on the mold core 22, and the heat insulation layer can be made of a wave-breaking heat effect by using a general-strength fiber composite material. Reverse protection, 12 branch of the phoenix column and the mold core 22; bl · # 4 · has a better guide. The material is the same as the body-forming '11' because the size of the mold core 22 is more evenly distributed in the heat insulation for support, or only supports the mold core for 22 days, and only a few support pillars on the right. The bottom of the mold core 22 may be: the circumference 1 or only the support central support 枉 12 is evenly distributed in the barrier deformation of the barrier, so how much the mold core 22 is used to strengthen the mold "11, which can be used to support the dimensional curvature change Further, the injection of the finished product is reduced to avoid the generation of the mold core 22. Please refer to FIG. 4, which is a structural diagram of the structure, the heating of the embodiment, and the heating of the embodiment of the second embodiment of the present invention. And the cooling structure 大致 'substantially; the second structure U system and the first system and the mold core 22 are separate elements, the same, the difference is that the support column 12 is in close contact with the mold core 22, 'when heating and cooling, Support X achieves increased heating of the mold core 10 201031512 'Cooling efficiency. Referring also to Figure 5, there is shown an enlarged schematic view of the coil of the present invention wound around a support post. The coil 13 is wound around the support column 12 in the axial direction of each support column 12, that is, at different horizontal planes, and has an electric current input port 131 and a current output port 132 (of course, current input The position of the port and the current input port can be interchanged, and the same heating function can still be achieved; when the current input port 131 and the current output port 132 are externally connected to a high-frequency power source (not shown) via the external wire, the high frequency is applied to the coil 13 At the time of current, that is, the high-cycle method simultaneously heats the mold core 22 and the support column 12, and since the support column 12 is used to support the mold core 22, the support column 12 and the mold core 22 are in contact with each other, and thus the support can be supported. The thermal energy of the column 12 is transferred to the mold core 22 to increase the heating efficiency. Since the support column 12 is used to support the mold core 22, and the support columns 12 are evenly distributed on the heat insulation layer 11, and each support column 12 has a predetermined space between them, when the support column 12 supports the mold core 22 That is, when the mold core 22 contacts the support 12, a cooling space 14 is defined between the heat insulation layer 11 and the bottom of the mold core 22. A cooling fluid (such as a gas or liquid) F is introduced into the cooling space 14 to directly contact the mold core 22 to carry away the heat of the mold core 22, while the cooling fluid F is also in direct contact with the support column 12 to carry away the heat of the support column 12. The mold core 22 is in contact with the support column 12, so the mold core 22 can also carry away part of the heat by the support column 12 to achieve the effect of rapidly cooling the mold core. In order to enhance the efficiency of rapid cooling, the coil 13 is composed of an insulating material 134 covered with a hollow copper tube 135, and the hollow copper tube 135 has a fluid line 133 at the center; since the coil 13 is connected with a high-frequency current, its

^UlUJ1J1Z itself is electrically resistive and the heat of the coil mold core 22 is simultaneously passed by the hard body (such as C, the temperature of the coil 13 itself is raised, and the heat band of the 13 itself, liquid) is passed into the fluid line 133. In conjunction with the aforementioned cooling space u, the overall cooling rate of the above-described social horse is achieved.

On the layer 11, the (four) miscellaneous 12 material is evenly distributed in the heat insulating core 22 to be uniformly 々 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载 载11 Concentration of heat is avoided directly by the mold core 22 to heat the mold core 22 'and the cooling space 14 cooling fluid (such as the gas spring column 12 contact 'passed in the cooling space 14 to achieve the return * will The heat of the mold core 22 and the support column 12 is transferred from the heat to the simple: but the mold core, and the mold core 22 can also take away the heat, and then pass the cooling fluid (such as gas or liquid to the coil 13). C itself is fluid? Pass the fluid pipe, ^...I take away to improve the overall cooling efficiency.

If it is supported by a plurality of support columns 12, it is possible to avoid bending deformation by a plurality of M and yarns, and borrow a dog. By holding, the thickness of the mold core 22 can be reduced, thereby improving the efficiency of heating and cooling of the Tongren 22. 1 is a cross-sectional view showing a second embodiment of the present invention. The structure of the embodiment is substantially the same as that of the first embodiment, and the same elements are denoted by the same element number, and The same structure has the same function and will not be described here. The heating and cooling structure 1a of the present embodiment differs from the heating and cooling structure 1 of the first embodiment in the number of support columns 12a and the structure of the coil 13a. 201031512 ' If the manufacturer uses a smaller size of the mold core 22, it is possible to use only a single support column 12a having a larger diameter, the material of which is the same as that of the mold core 22, and is disposed at the central portion of the heat insulation layer 11. 'To hold the mold 22 in the building, increase the 'strength of the mold 2' to avoid bending deformation of the mold core 22, thereby reducing the defective rate of the finished product. The coil 13a surrounds the support column 12a and is horizontally laid on the heat insulation layer 11, that is, it is wound on the same horizontal surface; when the current input port 131 and the electric flow output port 132 are externally connected to a high-frequency power source via an external wire ( (not shown) 'When the coil 13a is loaded with a high-frequency current', the mold core 22 and the column 12a are simultaneously heated in a high-frequency manner, and since the column 12a is used to support the mold core 22, the support column 2a is supported. The mold core 22 is in contact with each other, and thus the thermal energy of the support column 12a can be transferred to the mold core 22 to improve the heating efficiency. Since the support column 12a is used to support the mold core 22, the strength of the mold 2 is strengthened, and is disposed at the central portion of the heat insulation layer, when the support column i2a supports the mold core 22, it means that the mold core 22 contacts the support. When 12a is occupied, the cooling space η is defined between the heat insulating layer 11 and the bottom of the mold core 22. Therefore, according to the above configuration, the coil 13a is disposed in the cooling space 14, and the support column i2a is disposed, which not only prevents the bent bead of the smaller size from being deformed, but also generates a large number of defective products. The support column 12a can be directly contacted with the mold core 22 and the materials are the same. When heating and cooling, the heat of the mold core 22 can be lifted or taken away by the existence and characteristics of the support column 12a. In order to improve heating and cooling, please refer to FIG. 7, which is a partial cross-sectional view showing a magnetic powder layer sleeve of the present invention on the periphery of the support rod and the coil 201031512; the magnetic field generated by homogenizing the coil 13 The support column 12 can be uniformly heated. Therefore, a magnetic powder layer sleeve 15 is disposed outside the support column 12 and the coil 13 of the heating and cooling structure 1 of the first embodiment, and the magnetic powder layer sleeve 15 has a plurality of holes 151. The coil 13 can be passed through and the water can be circulated, thereby improving the efficiency of heating and cooling. In the above, it is merely described that the present invention is a preferred embodiment or embodiment of the technical means for solving the problem, and is not intended to limit the scope of the invention. That is, the equivalent changes and modifications made in accordance with the scope of the patent application of the present invention or the scope of the invention are covered by the scope of the invention. 14 is a schematic diagram showing electromagnetic induction by high-frequency heating; FIG. 2 is an exploded structural view showing a first embodiment of the present invention; and FIG. 3 is a cross-sectional view showing a first embodiment of the present invention. Figure 4 is an exploded perspective view showing a second embodiment of the present invention; Figure 5 is an enlarged schematic view showing the coil of the present invention wound around a support column; Figure 6 is a cross-sectional view showing a second embodiment of the present invention; as well as

Figure 7 is a partial cross-sectional view showing a magnetic powder layer sleeve of the present invention on the periphery of the support post and the coil. [Main component symbol description] 1 Heating and cooling structure lb Heating and cooling structure 11. Thermal insulation layer 12a Support column 13a Coil 132 Current output port 134 Insulation material 14 Cooling space 151 Hole 21 Mold base 22 Mold core B High frequency power supply la Heating And cooling structure 12 support column 13 coil 131 current input port 133 fluid line 135 hollow copper tube 15 magnetic powder layer sleeve 2 mold 211 cavity 221 mold six C conductor

201031512 E Eddy Current F Cooling Fluid Μ Magnetic Field R Coil

Claims (1)

201031512 VII. Patent application scope: 1. A heating and cooling structure for a mold, the mold comprises a mold base and a mold core, the mold base has a cavity for placing the mold core, and the mold core has a mold hole, the heating and cooling structure is disposed between the mold base and the mold core, comprising: a heat insulation layer disposed around the bottom surface and the bottom surface to isolate heat conduction between the mold base and the mold core; At least one support post disposed between the mold core and the heat insulating layer for supporting the mold core, and a coil surrounding the support column, the coil having a current input port and a current input port; wherein The bottom of the mold core and the heat insulation layer define a cooling space for introducing a cooling fluid, and the support column and the coil system are disposed in the cooling space. 2. The heating and cooling structure for a mold according to claim 1, wherein the coil is composed of a hollow copper tube covered with an insulating material and has a fluid line for The cooling fluid is introduced. 3. The heating and cooling structure for a mold according to claim 1, wherein the at least one support column is a plurality of support columns uniformly distributed between the mold core and the heat insulation layer. Cooling space. 4. The heating and cooling structure for a mold according to claim 3, wherein the coil is wound around each of the support columns at different horizontal planes in the axial direction of the support columns. 5. The heating and cooling method for a mold according to claim 1, wherein the at least one support column is a single support column disposed at a central portion of the heat insulation layer. 6. The heating and cooling structure for a mold according to claim 5, wherein the coil is wound around the support column and horizontally laid on the insulation layer at the same level. 7. The heating and cooling structure for a mold according to claim 4, wherein a magnetic powder layer sleeve is disposed outside each of the support columns and the corresponding coil, and the magnetic powder layer sleeve The barrel has a plurality of holes for the corresponding coil to pass through and the water supply flow. 18