A gradient temperature control mold with self-adjusting cooling rate and adjusting method

Abstract

This application provides a gradient temperature-controlled mold with a self-regulating cooling rate and a corresponding adjustment method, relating to the technical field of mold cooling. A gradient temperature-controlled mold with a self-regulating cooling rate includes a mold body and multiple temperature control units. The mold body has a cavity, and the multiple temperature control units are disposed around the cavity. Each temperature control unit includes a thermally conductive heat-spreading layer, a temperature control plate, a temperature control chamber, a water inlet pipe, and a water outlet pipe. The thermally conductive heat-spreading layer abuts against the outer wall of the cavity, and the temperature control plate is connected to the thermally conductive heat-spreading layer, used for heating or cooling the thermally conductive heat-spreading layer. The temperature control chamber is connected to the thermally conductive heat-spreading layer, forming a temperature control cavity between the temperature control chamber and the thermally conductive heat-spreading layer. The water inlet pipe and the water outlet pipe are both connected to the temperature control cavity. This application enables precise temperature adjustment and the formation of a temperature gradient in a localized area of ​​the mold cavity.

Description

Technical Field

[0001] This application relates to the technical field of mold cooling, and in particular to a gradient temperature control mold with self-regulating cooling rate and a method for regulating it. Background Technology

[0002] A die-casting mold is a mold used in the die-casting process. Molten metal is injected into the cavity of the mold under high pressure, allowing it to cool rapidly and solidify into a casting. An injection mold is a mold used in the injection molding process. Molten plastic is injected into the cavity of the mold under pressure, and after cooling, a plastic part is obtained.

[0003] In die casting and injection molding processes, after the molten material fills the mold cavity, the heat needs to be rapidly and controllably dissipated through the mold's cooling system, allowing the molten material to solidify and solidify according to a predetermined pattern. In related technologies, the mold cooling adopts an integral cooling system, which forms uniform cooling throughout the entire cavity by machining straight-line through-flow cooling water channels inside the upper and lower molds.

[0004] For products with large differences in wall thickness and complex structures, the heat load of different areas of the mold naturally varies significantly. Related technologies can only adjust the cooling flow rate of the cooling water channel as a whole, making it difficult to achieve precise temperature regulation in local areas and to form a temperature gradient in the mold cavity. This can easily lead to problems such as shrinkage cavities, porosity, and internal air holes caused by insufficient cooling in thick-walled areas, as well as weld lines and incomplete filling caused by excessively rapid cooling in thin-walled areas. Summary of the Invention

[0005] In order to precisely regulate the temperature of local areas of the mold cavity and form a temperature gradient, this application provides a gradient temperature control mold with self-regulating cooling rate and a regulation method.

[0006] This application provides a gradient temperature control mold with a self-adjusting cooling rate and an adjustment method, adopting the following technical solution: In a first aspect, this application provides a gradient temperature control mold with a self-adjusting cooling rate, including a mold body and a plurality of temperature control units, wherein the mold body is provided with a cavity, and the plurality of temperature control units are disposed around the cavity; The temperature control unit includes a thermally conductive and heat-spreading layer, a temperature control plate, a temperature control chamber, an inlet pipe, and an outlet pipe. The thermally conductive and heat-spreading layer abuts against the outer wall of the cavity. The temperature control plate is connected to the thermally conductive and heat-spreading layer and is used to heat or cool the thermally conductive and heat-spreading layer. The temperature control chamber is connected to the thermally conductive and heat-spreading layer, and a temperature control cavity is formed between the temperature control chamber and the thermally conductive and heat-spreading layer. The inlet pipe and the outlet pipe are both connected to the temperature control cavity.

[0007] By employing the above technical solution, coarse temperature adjustment is achieved through water flow within the temperature-controlled chamber, while fine-tuning is performed through temperature control plates on the heat-conducting and heat-spreading layer. This enables precise temperature regulation of localized areas within the mold cavity. Multiple temperature control units can independently adjust the temperature of different temperature-controlled zones on the outer wall of the cavity, forming a preset temperature gradient, which is beneficial for guiding the flow, solidification, and crystallization processes of the melt. The heat-conducting and heat-spreading layer ensures uniform heat distribution within the same temperature-controlled zone, improving the stability and consistency of temperature control.

[0008] Optionally, the temperature control unit further includes a water distribution network, the water inlet pipe is connected to the water distribution network, and the water distribution network has multiple water outlets.

[0009] By adopting the above technical solution, the multiple outlets of the water distribution network can ensure that the water flow entering the temperature control chamber is evenly distributed, avoiding local water flow concentration or sparseness, thereby improving the uniformity of temperature distribution in the temperature control chamber and ensuring the accuracy and stability of temperature coarse adjustment.

[0010] Optionally, a mixing mesh is connected inside the temperature control cavity, and the water distribution network is located inside the mixing mesh. The mixing mesh is used to mix the water flow inside the temperature control cavity.

[0011] By adopting the above technical solution, the mixed flow wire mesh can generate turbulence and mixing of water flow in the temperature control chamber, eliminate the phenomenon of water temperature stratification, further improve the uniformity of temperature distribution in the temperature control chamber, and make the coarse temperature adjustment more accurate and reliable.

[0012] Optionally, the temperature control unit further includes a connecting plate, one end of which is connected to the heat-conducting and heat-spreading layer and the temperature control chamber, and the other end of which is connected to the outer wall of the cavity.

[0013] By adopting the above technical solution, the connecting plate can fix the heat-conducting and heat-spreading layer and the temperature control chamber to the outer wall of the cavity, ensuring the structural stability and heat conduction reliability between the temperature control unit and the cavity, and facilitating the installation and positioning of the temperature control unit.

[0014] Optionally, a filling component is provided between adjacent temperature control units, the filling component being used to transfer heat between adjacent temperature control units.

[0015] By adopting the above technical solution, the filling component can transfer heat between adjacent temperature control units, reduce temperature change areas, and enable a smooth temperature transition between adjacent temperature control zones.

[0016] Optionally, the filling component includes a filling block and a covering foil. The filling block is flexible and is filled between adjacent temperature control units. The covering foil is bonded to the temperature control chamber of the adjacent temperature control unit and covers the outside of the filling block.

[0017] By adopting the above technical solution, the flexible filler block can adapt to the gap shape between adjacent temperature control units, ensuring the continuity of heat transfer. The covering foil can fix the position of the filler block, preventing it from shifting or falling off, and ensuring the long-term stable operation of the filler assembly.

[0018] Optionally, the temperature control chamber is provided with a clamping component, which applies force to the heat-conducting and heat-equalizing layer, so that the heat-conducting and heat-equalizing layer is pressed against the outer wall of the cavity.

[0019] By adopting the above technical solution, the clamping component can make the heat-conducting and heat-equalizing layer fit tightly against the outer wall of the cavity, reduce contact thermal resistance, and improve heat conduction efficiency. It is especially suitable for cases where the outer wall of the cavity is curved, thus enhancing the adaptability to the cavity.

[0020] Optionally, the clamping assembly includes a clamping screw and a sealing plug. The clamping screw passes through the temperature control chamber and is threadedly connected to the temperature control chamber. The heat-conducting and heat-spreading layer is flexible, and the clamping screw clamps against the heat-conducting and heat-spreading layer. The sealing plug is connected to both the clamping screw and the temperature control chamber, and the sealing plug seals the space between the clamping screw and the temperature control chamber.

[0021] By adopting the above technical solution, the tightening screw achieves adjustable tightening force through a threaded connection, facilitating the adjustment of the fit between the heat-conducting and heat-spreading layer and the outer wall of the cavity according to actual needs. The sealing plug prevents water leakage from the tightening screw within the temperature control chamber, ensuring the sealing performance and operational reliability of the temperature control chamber.

[0022] Optionally, the temperature control unit further includes a flow meter and multiple temperature control probes. The water inlet pipe is connected to the flow meter, and the multiple temperature control probes are used to detect the temperature of the heat-conducting heat spreader and the temperature control chamber, respectively.

[0023] By adopting the above technical solution, the flow meter can monitor the water flow rate in the inlet pipe in real time, facilitating precise control of the inlet flow rate to regulate the temperature of the temperature control chamber. The temperature control probe can detect the temperature of the heat-conducting heat spreader and the temperature control chamber in real time, providing feedback for temperature adjustment and enabling automatic temperature regulation.

[0024] Secondly, this application also provides a method for adjusting gradient temperature control with a self-regulating cooling rate, using the aforementioned gradient temperature control mold with a self-regulating cooling rate, comprising: The thermal distribution diagram of the area surrounding the cavity (11) is determined according to the process requirements; Based on the thermal distribution diagram, the outer wall of the cavity (11) is divided into temperature control zones, and temperature control units (2) are installed in the temperature control zones; the preset temperature value T of the temperature control zone during preheating is determined. 11 and the preset temperature T during cooling 12The coarse temperature adjustment value T of the temperature control chamber (203) during preheating was determined. 21 And the coarse temperature adjustment value T during cooling 22 The temperature fine-tuning value T of the temperature control plate (202) during preheating was calculated. 31 And the temperature fine-tuning value T during cooling 32 And satisfy T 11 =T 21 +T 31 T 12 =T 22 +T 32 ; Before injecting the melt into the mold cavity (11), the mold cavity (11) is preheated by the temperature control unit (2). Hot water is first introduced into the temperature control chamber (203) to make the temperature reach the coarse temperature adjustment value T. 21 Then the temperature control plate (202) is heated to compensate for the temperature fine-tuning value T. 31 This allows the temperature of the heat-conducting heat spreader (201) to reach the preset temperature value T. 11 ; When cooling of the cavity (11) is required, cold water is first introduced into the temperature control chamber (203) to bring the temperature to the coarse temperature adjustment value T. 22 Then the temperature control plate (202) is cooled to compensate for the temperature fine-tuning value T. 32 This allows the temperature of the heat-conducting heat spreader (201) to reach the preset temperature value T. 12 .

[0025] By adopting the above technical solution and employing a graded temperature control strategy combining coarse and fine adjustments, the water flow in the temperature-controlled chamber first rapidly reaches a near-target temperature, and then precise fine adjustments are made using temperature control plates, improving the efficiency and accuracy of temperature regulation. The graded temperature control strategy is used in both the preheating and cooling stages, meeting the stringent requirements of die casting and injection molding processes for mold temperature control, and effectively reducing defects such as shrinkage cavities, porosity, air bubbles, weld lines, and incomplete filling in the finished products.

[0026] In summary, this application includes at least one of the following beneficial effects: 1. By combining coarse adjustment of water flow in the temperature control chamber with fine adjustment of the temperature control plate, and with the heat-spreading effect of the heat-conducting and heat-spreading layer, precise temperature regulation and gradient temperature control of local areas of the mold cavity are achieved; 2. The uniformity of temperature distribution and the smoothness of temperature transition between adjacent temperature control zones are improved through the water distribution network, mixing wire mesh and filling components; 3. The clamping component enables the heat-conducting and heat-equalizing layer to fit tightly against the outer wall of the cavity, reducing contact thermal resistance, improving heat conduction efficiency, and enhancing adaptability to the cavity. Attached Figure Description

[0027] Figure 1This is a schematic diagram of the overall structure of a gradient temperature control mold with a self-adjusting cooling rate according to an embodiment of this application; Figure 2 This is a cross-sectional structural diagram of the lower mold of the mold body in an embodiment of this application; Figure 3 This is a cross-sectional structural diagram of adjacent temperature control units in an embodiment of this application; Figure 4 This is a cross-sectional structural diagram of a single temperature control unit according to an embodiment of this application; Figure 5 yes Figure 4 A top view of the central water inlet pipe and the water distribution network.

[0028] Explanation of reference numerals in the attached drawings: 1. Mold body; 11. Cavity; 2. Temperature control unit; 201. Heat-conducting and heat-spreading layer; 202. Temperature control plate; 203. Temperature control chamber; 2031. Temperature control cavity; 204. Water inlet pipe; 205. Water distribution network; 206. Water outlet pipe; 207. Mixing wire mesh; 208. Connecting plate; 209. Temperature control probe; 210. Flow meter; 3. Clamping assembly; 31. Clamping screw; 32. Sealing plug; 4. Filling assembly; 41. Filling block; 42. Covering foil. Detailed Implementation

[0029] The following combination Figures 1 to 5 This application will be described in further detail.

[0030] This application provides a gradient temperature control mold with a self-adjusting cooling rate.

[0031] refer to Figure 1 and Figure 2 A gradient temperature-controlled mold with a self-regulating cooling rate includes a mold body 1 and multiple temperature control units 2. The mold body 1 includes an upper mold and a lower mold. In this embodiment, the lower mold is used as an example. The lower mold of the mold body 1 is provided with a cavity 11. The shape of the cavity 11 is determined according to the shape of the product to be molded. In this embodiment, the outer wall of the cavity 11 is a simple planar structure. In other embodiments of this application, the outer wall of the cavity 11 can also be a complex curved surface structure. Multiple temperature control units 2 are arranged circumferentially along the outer wall of the cavity 11. The outer wall of the cavity 11 is divided into multiple temperature control zones, and each temperature control unit 2 controls the temperature of one temperature control zone.

[0032] refer to Figure 3 and Figure 4The temperature control unit 2 includes a thermally conductive heat dissipation layer 201, a temperature control plate 202, a temperature control chamber 203, a water inlet pipe 204, and a water outlet pipe 206. The thermally conductive heat dissipation layer 201 abuts against the outer wall of the cavity 11 and is made of a metal material with a high thermal conductivity, such as copper or aluminum. The surface of the thermally conductive heat dissipation layer 201 near the outer wall of the cavity 11 is coated with thermally conductive silicone grease to reduce the contact thermal resistance between the thermally conductive heat dissipation layer 201 and the outer wall of the cavity 11 and improve the heat conduction efficiency.

[0033] refer to Figure 3 and Figure 4 The temperature control element 202 is fixedly connected to the side of the heat-conducting and heat-spreading layer 201 away from the outer wall of the cavity 11. The temperature control element 202 can be a semiconductor cooling element, and it has two working modes: heating and cooling, and can switch between them. The temperature control element 202 is used to heat or cool the heat-conducting and heat-spreading layer 201 to achieve precise temperature regulation. When the temperature control element 202 is working, the heat or cold generated by it is transferred to the heat-conducting and heat-spreading layer 201, and then to the cavity 11, to achieve precise temperature control of the cavity 11.

[0034] refer to Figure 3 and Figure 4 The temperature control chamber 203 is fixedly connected to the side of the heat-conducting and heat-spreading layer 201 away from the outer wall of the cavity 11. A temperature control cavity 2031 is formed between the temperature control chamber 203 and the heat-conducting and heat-spreading layer 201. The temperature control cavity 2031 is a sealed space with a certain volume, used to contain the circulating heat exchange medium, usually water. Both the inlet pipe 204 and the outlet pipe 206 are connected to the temperature control cavity 2031. The inlet pipe 204 is used to introduce hot or cold water into the temperature control cavity 2031, and the outlet pipe 206 is used to discharge the water after heat exchange. By introducing water of different temperatures into the temperature control cavity 2031, the temperature inside the temperature control chamber 203 can be quickly changed, thereby affecting the temperature of the heat-conducting and heat-spreading layer 201 through heat conduction, achieving coarse temperature regulation.

[0035] refer to Figure 3 and Figure 4When it is necessary to adjust the temperature of a certain temperature control zone on the outer wall of the cavity 11, hot or cold water is first introduced into the temperature control chamber 2031 of the temperature control chamber 203 through the water inlet pipe 204. This can quickly change the temperature inside the temperature control chamber 203, bringing it close to the target temperature, thus achieving coarse temperature adjustment. Subsequently, the temperature control plate 202 is turned on to heat or cool the heat-conducting and heat-spreading layer 201, ensuring that the temperature of the heat-conducting and heat-spreading layer 201 precisely reaches the target temperature, thus achieving precise temperature adjustment. This application's graded temperature control method, which combines coarse and fine temperature adjustment, ensures both the speed of temperature adjustment and the accuracy of temperature control. Multiple temperature control units 2 can work independently, adjusting the temperature of different temperature control zones respectively, thereby forming a preset temperature gradient around the cavity 11. This is beneficial for guiding the flow, solidification, and crystallization process of the melt, solving the molding problems of products with large differences in wall thickness and complex structures.

[0036] refer to Figure 4 and Figure 5 The temperature control unit 2 also includes a water distribution network 205, with an inlet pipe 204 connected to it. The water distribution network 205 is located inside the temperature control chamber 2031. The water distribution network 205 is configured as a grid, with multiple water outlets. When water enters the water distribution network 205 from the inlet pipe 204, it flows out evenly through the multiple outlets and enters the temperature control chamber 2031. The water distribution network 205 ensures a uniform distribution of water flow into the temperature control chamber 2031, improving the uneven temperature distribution caused by localized water flow concentration, thereby enhancing the uniformity of temperature distribution within the temperature control chamber 203 and ensuring the accuracy and stability of temperature coarse adjustment.

[0037] refer to Figure 3 and Figure 4 A mixing mesh 207 is fixedly connected inside the temperature control chamber 2031. The mixing mesh 207 is made of woven stainless steel wire. The water distribution network 205 is located inside the mixing mesh 207, that is, the mixing mesh 207 covers the outside of the water distribution network 205. When water flows out of the outlet of the water distribution network 205, it will pass through the mixing mesh 207. The mesh structure of the mixing mesh 207 can generate turbulence and mixing of the water flow, reduce the possibility of temperature stratification in the water flow, and make the water temperature in the temperature control chamber 2031 more uniform.

[0038] refer to Figure 3 and Figure 4 The temperature control unit 2 also includes a connecting plate 208. One end of the connecting plate 208 is fixedly connected to the heat-conducting and heat-spreading layer 201 and the temperature control chamber 203, respectively, and the other end of the connecting plate 208 is connected to the outer wall of the cavity 11 by screws. The connecting plate 208 fixes the heat-conducting and heat-spreading layer 201 and the temperature control chamber 203 to the outer wall of the cavity 11, ensuring the structural stability and reliability of heat conduction between the temperature control unit 2 and the cavity 11.

[0039] refer to Figure 3 and Figure 4 A filling assembly 4 is provided between adjacent temperature control units 2. The filling assembly 4 includes a filling block 41 and a covering foil 42. The filling block 41 is flexible and is usually made of a material that combines flexibility and thermal conductivity, such as thermally conductive silicone or thermally conductive rubber. The filling block 41 fills the gap between adjacent temperature control units 2 and contacts the connecting plate 208. Because the filling block 41 is flexible, it can adapt to the gap shape between adjacent temperature control units 2. The filling block 41 is used to transfer heat between adjacent temperature control units 2, so that the temperature of adjacent temperature control zones can be smoothly transitioned.

[0040] refer to Figure 3 and Figure 4 The covering foil 42 is bonded to the temperature control chamber 203 of the adjacent temperature control unit 2. The covering foil 42 covers the outside of the filler block 41 and can be made of metal materials with good thermal conductivity and ductility, such as aluminum foil or copper foil. The covering foil 42 covers and fixes the filler block 41, reducing the possibility of the filler block 41 shifting or falling off due to vibration or thermal expansion and contraction during mold operation, and ensuring the long-term stable operation of the filling component 4. At the same time, the covering foil 42 itself also has good thermal conductivity, which can help transfer heat and enhance the thermal coupling effect between adjacent temperature control units 2.

[0041] refer to Figure 3 and Figure 4 The temperature control chamber 203 is equipped with a clamping assembly 3, which includes a clamping screw 31 and a sealing plug 32. The clamping screw 31 passes through the side of the temperature control chamber 203 away from the heat-conducting and heat-spreading layer 201 and is threadedly connected to the temperature control chamber 203. The clamping screw 31 is made of stainless steel, and its end is machined into a hemispherical or flat shape to reduce the contact stress with the heat-conducting and heat-spreading layer 201. The heat-conducting and heat-spreading layer 201 is flexible. When the clamping screw 31 is tightened, the end of the clamping screw 31 presses against the surface of the heat-conducting and heat-spreading layer 201 away from the outer wall of the cavity 11, pushing the heat-conducting and heat-spreading layer 201 towards the outer wall of the cavity 11 until the heat-conducting and heat-spreading layer 201 is tightly attached to the outer wall of the cavity 11. When the outer wall of the cavity 11 is curved or irregular in shape, the heat-conducting and heat-spreading layer 201 is difficult to naturally adhere to the outer wall of the cavity 11, resulting in increased contact thermal resistance and reduced heat conduction efficiency. The clamping component 3 can apply a force pointing towards the outer wall of the cavity 11, so that the heat-conducting and heat-spreading layer 201 tightly adheres to the curved shape of the outer wall of the cavity 11, thereby facilitating heat conduction.

[0042] refer to Figure 3 and Figure 4The sealing plug 32 is fixedly connected to both the tightening screw 31 and the temperature control chamber 203. The sealing plug 32 is a rubber sealing ring, which is sleeved on the tightening screw 31 and clamped between the tightening screw 31 and the outer wall of the temperature control chamber 203. The sealing plug 32 seals the space between the tightening screw 31 and the temperature control chamber 203, preventing water in the temperature control chamber 2031 from leaking out from the point where the tightening screw 31 passes through.

[0043] refer to Figure 3 and Figure 4 The temperature control unit 2 also includes a flow meter 210 and a temperature control probe 209. The flow meter 210 is connected to the water inlet pipe 204 and is used to measure the water flow rate in the water inlet pipe 204 in real time. By monitoring the water flow rate, the heat exchange capacity of the temperature control chamber 203 can be obtained, which facilitates precise adjustment of the water flow rate to control the temperature of the temperature control chamber 203.

[0044] refer to Figure 3 and Figure 4 Temperature control probe 209 is used to detect the temperature inside the heat-conducting and heat-spreading layer 201 and the temperature control chamber 203. Two temperature control probes 209 are provided: one probe part is embedded inside the heat-conducting and heat-spreading layer 201 to detect the temperature of the heat-conducting and heat-spreading layer 201; the other probe part is inserted into the temperature control chamber 2031 to detect the water temperature inside the temperature control chamber 203. Through real-time detection by the temperature control probes 209, actual temperature data can be obtained and compared with preset temperature values. Feedback is used to automatically adjust the power of the temperature control plate 202 and the water flow rate of the inlet pipe 204, achieving closed-loop control and automatic adjustment of the temperature, thus improving the accuracy and stability of temperature control.

[0045] This application also provides a gradient temperature control method with a self-regulating cooling rate, comprising the following steps: Step S10: Determine the thermal distribution map of the area surrounding cavity 11 according to process requirements.

[0046] Specifically, based on the structural characteristics, wall thickness distribution, material properties, and molding process parameters (such as melt temperature, injection pressure, and cooling time) of the product to be molded, the heat load distribution in each area around the cavity 11 is determined, and a thermal distribution diagram is drawn. The thermal distribution diagram reflects the heat that needs to be released or replenished in different areas of the cavity 11 during the molding process.

[0047] Step S20: Divide the outer wall of cavity 11 into temperature control zones according to the thermal distribution diagram, and install temperature control unit 2 in the temperature control zones.

[0048] Specifically, based on the thermal distribution map, areas with similar heat loads or the same temperature control requirements are divided into a temperature control zone. Generally, areas with thicker walls have larger heat loads and require stronger cooling capacity, so multiple temperature control units 2 are installed in one temperature control zone; areas with thinner walls have smaller heat loads, so several adjacent areas can be combined into one temperature control zone, and one temperature control unit 2 is installed in one temperature control zone.

[0049] Step S30: Determine the preset temperature value, coarse adjustment value, and fine adjustment value.

[0050] Determine the preset temperature T for each temperature control zone during preheating. 11 and the preset temperature T during cooling 12 Preheating temperature T 11 The cooling temperature T is determined based on the properties of the melt material, requiring the melt to maintain good fluidity during the filling process. 12 The requirements are determined based on the solidification characteristics and demolding requirements of the product, and it is necessary to ensure that the product is fully solidified and easy to demold.

[0051] At the same time, the coarse temperature adjustment value T of the temperature control chamber 203 during preheating was determined. 21 And the coarse temperature adjustment value T during cooling 22 Based on the temperature value of the heat-conducting and heat-spreading layer 201 detected by the temperature control probe 209, the temperature fine-tuning value T of the temperature control plate 202 during preheating is calculated. 31 And the temperature fine-tuning value T during cooling 32 The preset temperature value, coarse adjustment value, and fine adjustment value satisfy the following relationship: T 11 =T 21 +T 31 T 12 =T 22 +T 32 Among them, T 21 and T 22 To determine the temperature that can be achieved by introducing hot or cold water into the temperature-controlled chamber 203, T 31 and T 32 This represents the temperature difference that the temperature control element 202 needs to compensate for. In this embodiment, T 31 and T 32 The absolute values ​​are all less than 5℃ to ensure that the load on the temperature control plate 202 is moderate, so that it can achieve precise adjustment without causing excessive energy consumption or excessive adjustment time due to excessive temperature difference.

[0052] Step S40: Graded temperature control during the preheating stage.

[0053] Before injecting the melt into the cavity 11, the mold needs to be preheated so that the cavity 11 reaches the preset preheating temperature T. 11The preheating process employs a staged temperature control strategy: First, hot water is introduced into the temperature control chamber 2031 of the temperature control chamber 203 through the water inlet pipe 204. The temperature of the hot water is controlled by a temperature T. 21 Adjustments are made to achieve the target temperature. Through the circulation of hot water, the temperature within the temperature control chamber 203 is rapidly increased to the coarse temperature setting value T. 21 Because water has a large heat capacity and high heat transfer efficiency, it can quickly achieve rough temperature regulation.

[0054] Temperature probe 209 detects the water temperature inside temperature control chamber 203 and the temperature of thermally conductive heat spreader 201. When the temperature of thermally conductive heat spreader 201 reaches T... 21 When the temperature control element 202 is activated, it begins heating. When the temperature control element 202 compensates for the temperature fine-tuning value T... 31 At that time, the temperature of the heat-conducting and heat-spreading layer 201 can be stabilized at the preset temperature value T. 11 At this point, preheating is complete, and melt injection can begin. Since the temperature of the temperature control chamber 203 has already approached the target value through coarse adjustment, the temperature control plate 202 only needs to provide a small amount of power for fine adjustment, which ensures adjustment accuracy and avoids the temperature control plate 202 operating under high load for extended periods.

[0055] Step S50: Staged temperature control during cooling. After the melt fills the cavity 11, it needs to be cooled to solidify the melt. The cooling process also adopts a staged temperature control strategy: First, stop supplying hot water to the temperature control chamber 203 and replace it with cold water. The temperature of the cold water is set at T... 22 Adjustments are made to achieve the target temperature. Through the circulation of cold water, the temperature within the temperature control chamber 203 is rapidly reduced to the coarse temperature adjustment value T. 22 It quickly removes a large amount of heat, achieving rapid cooling.

[0056] When the temperature control probe 209 detects that the temperature of the heat-conducting and heat-spreading layer 201 has reached T 22 Then, the working mode of the temperature control element 202 is adjusted, and the temperature control element 202 compensates for the temperature fine-tuning value T. 32 Then, the temperature of the heat-conducting and heat-spreading layer 201 can be stabilized at the preset temperature value T. 12 .

[0057] The implementation principle of the gradient temperature control mold and adjustment method with self-adjusting cooling rate in this application embodiment is as follows: hot or cold water is introduced into the temperature control chamber 203 to quickly approach the target temperature, and then the heat-conducting and heat-spreading layer 201 is precisely fine-tuned using the temperature control plate 202 to achieve rapid and precise control of the temperature of the cavity 11. Multiple temperature control units 2 are independently arranged along the cavity 11 to form a preset temperature gradient, guiding the melt to solidify in an orderly manner.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A gradient temperature control mold with self-adjusting cooling rate, characterized in that: It includes a mold body (1) and multiple temperature control units (2), wherein the mold body (1) is provided with a cavity (11), and the multiple temperature control units (2) are disposed around the cavity (11); The temperature control unit (2) includes a heat-conducting and heat-spreading layer (201), a temperature control plate (202), a temperature control chamber (203), a water inlet pipe (204), and a water outlet pipe (206). The heat-conducting and heat-spreading layer (201) abuts against the outer wall of the cavity (11), the temperature control plate (202) is connected to the heat-conducting and heat-spreading layer (201), and the temperature control plate (202) is used to heat or cool the heat-conducting and heat-spreading layer (201). The temperature control chamber (203) is connected to the heat-conducting and heat-spreading layer (201), and a temperature control cavity (2031) is formed between the temperature control cavity (203) and the heat-conducting and heat-spreading layer (201). The water inlet pipe (204) and the water outlet pipe (206) are both connected to the temperature control cavity (2031).

2. The gradient temperature control mold with self-adjusting cooling rate according to claim 1, characterized in that: The temperature control unit (2) also includes a water distribution network (205), the water inlet pipe (204) is connected to the water distribution network (205), and the water distribution network (205) has multiple water outlets.

3. The gradient temperature control mold with self-adjusting cooling rate according to claim 2, characterized in that: The temperature control cavity (2031) is connected to a mixing wire mesh (207), and the water distribution network (205) is located inside the mixing wire mesh (207). The mixing wire mesh (207) is used to mix the water flow in the temperature control cavity (2031).

4. The gradient temperature control mold with self-adjusting cooling rate according to claim 1, characterized in that: The temperature control unit (2) also includes a connecting plate (208), one end of which is connected to the heat-conducting and heat-spreading layer (201) and the temperature control chamber (203), and the other end of which is connected to the outer wall of the cavity (11).

5. A gradient temperature control mold with self-adjusting cooling rate according to claim 4, characterized in that: A filling component (4) is provided between adjacent temperature control units (2), and the filling component (4) is used to transfer heat between adjacent temperature control units (2).

6. A gradient temperature control mold with self-adjusting cooling rate according to claim 5, characterized in that: The filling component (4) includes a filling block (41) and a covering foil (42). The filling block (41) is flexible and is filled between adjacent temperature control units (2). The covering foil (42) is bonded to the temperature control chamber (203) of the adjacent temperature control unit (2) and is wrapped around the outside of the filling block (41).

7. A gradient temperature control mold with self-adjusting cooling rate according to claim 1, characterized in that: The temperature control chamber (203) is provided with a clamping component (3), which applies force to the heat-conducting and heat-equalizing layer (201) so that the heat-conducting and heat-equalizing layer (201) presses against the outer wall of the cavity (11).

8. A gradient temperature control mold with self-adjusting cooling rate according to claim 7, characterized in that: The clamping assembly (3) includes a clamping screw (31) and a sealing plug (32). The clamping screw (31) passes through the temperature control chamber (203) and is threadedly connected to the temperature control chamber (203). The heat-conducting and heat-spreading layer (201) is flexible, and the clamping screw (31) clamps against the heat-conducting and heat-spreading layer (201). The sealing plug (32) is connected to the clamping screw (31) and the temperature control chamber (203) respectively, and the sealing plug (32) seals the space between the clamping screw (31) and the temperature control chamber (203).

9. A gradient temperature control mold with self-adjusting cooling rate according to claim 1, characterized in that: The temperature control unit (2) also includes a flow meter (210) and multiple temperature control probes (209). The water inlet pipe (204) is connected to the flow meter (210), and the multiple temperature control probes (209) are used to detect the temperature inside the heat-conducting heat-spreading layer (201) and the temperature control chamber (203), respectively.

10. A method for adjusting gradient temperature control with a self-regulating cooling rate, characterized in that: Using a gradient temperature control mold with a self-regulating cooling rate as described in any one of claims 1-9, the method includes the following steps: The thermal distribution diagram of the area surrounding the cavity (11) is determined according to the process requirements; Based on the thermal distribution diagram, the outer wall of the cavity (11) is divided into temperature control zones, and temperature control units (2) are installed in the temperature control zones; the preset temperature value T of the temperature control zone during preheating is determined. 11 and the preset temperature T during cooling 12 The coarse temperature adjustment value T of the temperature control chamber (203) during preheating was determined. 21 And the coarse temperature adjustment value T during cooling 22 The temperature fine-tuning value T of the temperature control plate (202) during preheating was determined. 31 And the temperature fine-tuning value T during cooling 32 And satisfy T 11 =T 21 +T 31 T 12 =T 22 +T 32 ; Before injecting the melt into the mold cavity (11), the mold cavity (11) is preheated by the temperature control unit (2). Hot water is first introduced into the temperature control chamber (203) to make the temperature reach the coarse temperature adjustment value T. 21 Then the temperature control plate (202) is heated to compensate for the temperature fine-tuning value T. 31 This allows the temperature of the heat-conducting heat spreader (201) to reach the preset temperature value T. 11 ; When cooling of the cavity (11) is required, cold water is first introduced into the temperature control chamber (203) to bring the temperature to the coarse temperature adjustment value T. 22 Then the temperature control plate (202) is cooled to compensate for the temperature fine-tuning value T. 32 This allows the temperature of the heat-conducting heat spreader (201) to reach the preset temperature value T. 12 .

Images