Composite lower die structure for rapid cooling

Abstract

The invention discloses a composite lower die structure for rapid cooling. The composite lower die structure comprises a lower die gasket and a lower die cooling cavity. The lower die cooling cavity comprises a cooling outer cavity and a cooling inner cavity, the cooling outer cavity is coaxially sleeved with the lower die gasket, a plurality of outer cavity channels are formed in the side wall of the cooling outer cavity in a penetrating mode, the cooling inner cavity is coaxially arranged in the cooling outer cavity in a sleeved mode, and a plurality of inner cavity channels are formed in the outer surface of the cooling inner cavity; a cooling liquid inlet is formed in one end of the inner cavity channel, the other end of the inner cavity channel is communicated with the outer cavity channel, the top of the cooling outer cavity is coaxially sleeved with an upper positioning boss, the upper positioning boss comprises an upper die compression face and a positioning face, and when the die is closed, the upper die compression face and the positioning face are matched with each other. The upper end of the cooling outer cavity is coaxially connected with the upper die in a sleeved mode, and the top face of the cooling outer cavity abuts against the upper die. The cooling efficiency of the lower die can be effectively improved, meanwhile, the coaxiality of the upper die and the lower die is further improved, and the service life of the die is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing of molded products, and particularly to a composite lower mold structure for rapid cooling. Background Art

[0002] With the development of the economy, domestic large beverage enterprises have an increasingly strong demand for bottle cap production equipment production lines with high-speed, high-efficiency, and high-stability production capabilities. The traditional bottle cap production process is injection molding, but injection molding is suitable for producing corresponding products with complex shapes. For simple thin-walled multi-cavity products, the traditional injection molding process has few advantages. Relatively speaking, the compression molding process has the advantages of easy operation, easier mold replacement, lower temperature, lower overall process energy consumption, no injection gate for its products, relatively smaller shrinkage coefficient compared to injection molding, more precise dimensions, and better appearance quality. Therefore, the compression molding process is more and more widely used in the field of simple thin-walled products. Correspondingly, with the development of the compression molding process, manufacturers' requirements for the production stability and production efficiency of compression molding equipment are also getting higher and higher.

[0003] To improve the production efficiency of compression molding equipment, it is necessary to shorten the molding cycle of products. Existing compression molding equipment uses molds to shape products. When the mold is filled with rubber granules, in the initial stage, the upper and lower molds need to be quickly closed. When the closing is almost in place, due to the presence of internal rubber, the load resistance increases. At this time, the actuator needs to provide a large closing force and continue to apply a large pressure to the internal rubber at a slower speed to mold the internal rubber, and at the same time, quickly cool it under this large pressure. After the product is cooled and molded, the mold can be opened and transferred to the next station. It can be seen that the main limitation of the compression molding process for its molding cycle is product cooling. Therefore, it is necessary to quickly improve the cooling efficiency of the mold, which has higher requirements for the structural rigidity of the equipment itself, the accuracy of components, and product cooling, especially related to the cooling of product compression molding.

[0004] The general structure of existing compression molding molds is as Figure 1As shown, it includes an upper mold 500 and a lower mold 200. When the molds are closed, the lower part of the upper mold 500 is contained within the lower mold 200, and the gap channel between the upper mold 500 and the lower mold 200 is the space for the molded product 600 to be produced. Among them, the lower mold 200 includes a locking end cap 1, a lower mold water distribution block 2, a lower mold washer 4, a lower mold steel sleeve 6, a lower mold cover surface 5, and a lower mold cavity 7 that are sleeved in sequence. It also includes a cavity installation sleeve 3. The upper and lower ends of the cavity installation sleeve 3 are respectively sleeved with the lower mold cavity 7 and the locking end cap 1, and the lower mold cavity 7 and the lower mold steel sleeve 6 are clamped between the upper end of the cavity installation sleeve 3 and the lower mold washer 4 from top to bottom. And, a water distribution block central channel 201, a water distribution block top surface channel 202, and a water distribution block inclined channel 203 are provided on the lower mold water distribution block 2. An annular installation sleeve channel 301 is provided on the cavity installation sleeve 3. A washer channel 401 is provided on the lower mold washer 4. A cover surface channel 501 is provided on the lower mold cover surface 5. An annular steel sleeve channel 601 is provided on the lower mold steel sleeve 6. An annular cavity channel 701 is provided on the lower mold cavity 7. When the molds are closed, the lower mold 200 is fixed to the mold closing piston rod (not shown) through a locking nut 1 and moves towards the upper mold 500 along with the mold closing piston rod until the molded product 600 is pressed between the lower mold 200 and the upper mold 500. At this time, the coolant is transported from the water inlet pipeline of the compression molding equipment to the water distribution block central channel 201, and then flows through the washer channel 401, the cover surface channel 501, the annular steel sleeve channel 601, the annular cavity channel 701, the annular installation sleeve channel 301, the water distribution block top surface channel 202, and the water distribution block inclined channel 203 in sequence, and finally flows to an external heat exchanger through the water return pipeline of the compression molding equipment, so that the coolant whose temperature has risen after cooling can be heat-exchanged and cooled down. Since the lower mold cover surface 5 and the lower mold cavity 7 are in direct contact with the molded product 600, and one of their surfaces is the molding surface of the molded product 600, when the coolant passes through the cover surface channel 501 in the lower mold cover surface 5 as described above, the coolant contacts the lower mold cover surface 5 and conducts heat exchange. Similarly, when the coolant passes through the annular steel sleeve channel 601 and the annular cavity channel 701, the coolant contacts the lower mold cavity 7 and conducts heat exchange, thereby cooling the two parts of the lower mold cover surface 5 and the lower mold cavity 7, and further cooling the molded product 600 to a specific temperature for rapid molding.

[0005] The above is the known structure of the lower mold of the existing compression molding die and the water channel structure and principle for cooling the molded product 600. However, it should be noted that in order to improve production efficiency, it is necessary to extremely compress the mold opening and closing time. And to ensure that the mold is closed in a shorter time, it is necessary to accelerate the mold closing speed. Therefore, the upper and lower molds need to be opened frequently, and more heat will be generated per unit time. And after the upper and lower molds are closed, it is necessary to ensure the cooling efficiency of the molded product 600 to enable the product to be rapidly molded. The mold closing force when the upper and lower molds are closed mainly acts on the mold closing contact surface between the lower mold 200 and the upper mold 500. CombiningFigure 1 It can be seen that the clamping force mainly acts on the upper surface of the lower mold cavity 7. The upper surface of the lower mold cavity 7 needs to frequently contact the corresponding parts of the upper mold 500, withstand the corresponding impacts, play the roles of stopping and axial positioning, and put forward higher requirements for the structural strength and precision of the lower mold cavity 7. Therefore, to ensure the strength and service life of the lower mold cavity 7, while ensuring the cooling efficiency, the anti-rust performance, strength, and heat treatment process performance of the lower mold cavity 7 need to be considered. After considering all these performances, the selection of the material for the lower mold cavity 7 is limited, and further its thermal conductivity is limited. As a result, in the existing lower mold 200, the thermal conductivity coefficient of the material of the lower mold cover surface 5 is much smaller than that of the material of the mold cover surface 25, affecting the cooling efficiency of the lower mold 200 and the product molding cycle.

[0006] In addition, as Figure 1 shown, the existing lower mold 200 is fixed on the clamping piston rod (not shown) through the locking end cover 1, and the upper and lower molds are clamped under the drive of the clamping piston rod. Moreover, the locking end cover 1, the lower mold water dividing block 2, the lower mold washer 4, the lower mold steel sleeve 6, the lower mold cavity 7, and the lower mold cover surface 5 are coaxially sleeved in sequence. The above-mentioned structure of the lower mold 200 is complex and has many components. The more complex the structure and the more components there are, the greater the influence of the machining errors of each component and the matching errors between different components on the coaxiality, and the greater the errors and sealing performance of the mating surfaces between the components. The coolant may leak from the gaps between the mating surfaces, affecting the cooling efficiency. And when the upper and lower molds are clamped, they are prone to deviation, thereby reducing the precision of the molded product 600. When the upper and lower molds operate for a long time, it will also cause more unnecessary wear to the molds, shortening the service life of the molds.

[0007] Therefore, how to accelerate the cooling efficiency of the lower mold on the basis of the existing lower mold structure, and at the same time, how to ensure the coaxiality of the upper and lower molds is further improved when the upper and lower molds are clamped on the basis of the existing lower mold structure is still a problem. Summary of the Invention

[0008] The purpose of the present invention is to provide a composite lower mold structure for rapid cooling, which can effectively accelerate the cooling efficiency of the lower mold and achieve better coaxiality when the lower mold parts are assembled by themselves, thereby further improving the coaxiality of the upper and lower molds and extending the service life of the molds.

[0009] To achieve the above purpose, the present invention adopts the following technical solutions:

[0010] A composite lower die structure for rapid cooling provided by the present invention includes a lower die washer and a lower die cooling cavity; the lower die cooling cavity includes a cooling outer cavity and a cooling inner cavity. Among them, the cooling outer cavity is coaxially sleeved with the lower die washer, and multiple outer cavity channels penetrate through the side wall of the cooling outer cavity. The cooling inner cavity is coaxially sleeved inside the cooling outer cavity, and multiple inner cavity channels are arranged on the outer surface of the cooling inner cavity. One end of the inner cavity channel is a coolant inlet, and the other end of the inner cavity channel is communicated with the outer cavity channel. And when the mold is closed, the upper end of the cooling outer cavity is coaxially sleeved with the upper die, and the top surface of the cooling outer cavity abuts against the upper die.

[0011] Further, the cooling outer cavity includes an upper positioning boss, and the upper positioning boss includes an upper die pressure-receiving surface and a positioning surface. When the mold is closed, the upper die pressure-receiving surface abuts against the upper die in the axial direction, and the positioning surface abuts against the upper die in the radial direction.

[0012] Further, a first positioning concave platform is arranged on the lower surface of the cooling outer cavity, and the first positioning concave platform is coaxially sleeved with the upper end of the lower die washer. And a lower positioning boss is arranged on the lower die water dividing block, and the lower positioning boss is coaxially sleeved with the lower end of the lower die washer.

[0013] Further, a second positioning concave platform is arranged on the inner side surface of the cooling outer cavity, and an inner cavity boss is arranged on the outer side surface of the cooling inner cavity. The second positioning concave platform is coaxially sleeved with the inner cavity boss.

[0014] Further, the inner cavity channel includes multiple transverse channels and multiple longitudinal channels. Among them, the transverse channels are arranged on the lower surface of the cooling inner cavity, and the multiple longitudinal channels are arranged in a surrounding manner on the outer side surface of the cooling inner cavity. One end of the transverse channel is a coolant inlet, and the other end of the transverse channel is communicated with the longitudinal channels and the outer cavity channels in sequence.

[0015] Further, a guiding concave platform is arranged on the inner side surface of the cooling outer cavity, and the guiding concave platform and the outer side surface of the cooling inner cavity cooperate to form an annular liquid flow space. The lower end of the longitudinal channel is communicated with the liquid flow space.

[0016] Further, an annular distribution channel is arranged on the inner side surface of the cooling outer cavity, and one end of each outer cavity channel close to the cooling inner cavity is communicated with the annular distribution channel, and the upper end of each longitudinal channel is communicated with the annular distribution channel.

[0017] Further, an O-ring groove is arranged on the inner side surface of the cooling outer cavity or the outer side surface of the cooling inner cavity, and a fourth O-ring is sleeved in the O-ring groove.

[0018] Further, the outer cavity channel is inclined downward along the liquid flow direction, the length direction of the longitudinal channel is parallel to the axis of the cooling inner cavity, and multiple transverse channels are arranged in a divergent manner from the center of the lower surface of the cooling inner cavity to the periphery.

[0019] Further, anti-slip teeth are provided on the inner side surface of the cooling inner cavity, and the inner bottom surface of the cooling inner cavity is the cavity bottom.

[0020] Further, the cooling inner cavity is made of a material with good heat conduction performance, and the cooling outer cavity and the upper positioning boss are made of a material with anti-rust performance and good comprehensive mechanical properties.

[0021] Due to the adoption of the above structure, the beneficial effects of the present invention are as follows:

[0022] 1. In the present invention, by splitting the lower die cooling cavity into a cooling outer cavity and a cooling inner cavity, when the molds are closed, the cooling outer cavity abuts against the upper die in the axial direction, and the clamping force generated by the mutual collision of the upper and lower molds acts directly on the lower die washer through the cooling outer cavity, effectively reducing the influence of the clamping force on the cooling inner cavity. Thus, the cooling outer cavity and the cooling inner cavity can be made of different materials respectively. For example, a material with good heat conduction performance can be used to make the cooling inner cavity in contact with the product, and at the same time, a material with anti-rust performance and good comprehensive mechanical properties is used to make the cooling outer cavity without considering the heat conduction performance of the cooling outer cavity. While ensuring the cooling function, the lower die cooling cavity can take into account its anti-rust performance, strength and heat treatment process performance. While improving the service life of the lower die cooling cavity, its cooling efficiency is greatly improved, effectively ensuring the cooling of the product and accelerating the molding cycle of the product.

[0023] 2. In the present invention, the cooling outer cavity is coaxially sleeved with the lower die washer, and the cooling inner cavity is coaxially sleeved with the cooling inner cavity. That is, on the basis of the coaxiality of the lower die washer and the upper die, the cooling inner cavity in contact with the product is coaxially positioned with the lower die washer only through one component, namely the cooling outer cavity, simplifying the processing and assembly difficulty of the lower die cooling cavity, further ensuring the coaxiality of the cooling inner cavity with the upper die after assembly and during use, reducing the deviation and die wear between the cooling inner cavity and the upper die during mold closing, and thus improving the accuracy of the molded product and the service life of the mold. It can also effectively ensure the sealing performance after assembly, reduce the leakage during the flow of the coolant, and thus ensure the cooling efficiency. And when the molds are closed, the side surface of the cooling outer cavity abuts against the upper die in the radial direction, which can improve the positioning accuracy of the upper die and the lower die cooling cavity in the radial direction. That is, when the upper die is pressed into the cooling inner cavity, the coaxiality of the upper die and the cooling outer cavity can be effectively ensured, and thus the coaxiality of the upper die and the cooling inner cavity is ensured, reducing the die wear during the long-term operation of the upper and lower dies. Especially when a material with anti-rust performance and good comprehensive mechanical properties is used to make the cooling outer cavity, the service life of the mold during long-term use can be further improved.

[0024] The present invention will become clearer with the following description in conjunction with the accompanying drawings, which are used to explain the embodiments of the present invention. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a cross-sectional view when the existing upper mold and lower mold are closed.

[0027] Figure 2 It is a perspective view of the present invention.

[0028] Figure 3 It is a half cross-sectional view of the present invention.

[0029] Figure 4 It is a half cross-sectional view of the present invention.

[0030] Figure 5 It is one of the perspective views of the cooling inner cavity of the present invention.

[0031] Figure 6 It is the second perspective view of the cooling inner cavity of the present invention.

[0032] Figure 7 It is the front view of the cooling inner cavity of the present invention.

[0033] Figure 8 It is the bottom view of the cooling inner cavity of the present invention.

[0034] Figure 9 It is the perspective view of the cooling outer cavity of the present invention.

[0035] Figure 10 It is a half cross-sectional view of the cooling outer cavity of the present invention.

[0036] Reference numerals: lower mold - 200, molded product - 600, upper mold - 500, locking end cap - 1, lower mold water distribution block - 2, water distribution block central channel - 201, water distribution block top surface channel - 202, water distribution block inclined channel - 203, cavity mounting sleeve - 3, annular mounting sleeve channel - 301, lower mold washer - 4, washer channel - 401, lower mold cover surface - 5, cover surface channel - 501, lower mold steel sleeve - 6, annular steel sleeve channel - 601, lower mold cavity - 7, annular cavity channel - 701, lower mold cooling cavity - 8, cooling inner cavity - 801, inner cavity boss - 8011, longitudinal channel - 8012, O-ring groove - 8013, transverse channel - 8014, anti-slip teeth - 8015, cavity bottom - 8016, cooling outer cavity - 802, first positioning boss - 8021, second positioning boss - 8022, guiding boss - 8023, outer cavity channel - 8024, annular distribution channel - 8025, upper positioning boss - 8026, fourth O-ring - 803, first O-ring - 804, second O-ring - 805, third O-ring - 806, upper mold pressure receiving surface - 807, positioning surface - 808. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figures 1 to 10 , a composite lower mold structure for rapid cooling provided by the present invention includes a lower mold washer 4 and a lower mold cooling cavity 8; the lower mold cooling cavity 8 includes a cooling outer cavity 802 and a cooling inner cavity 801. Among them, the cooling outer cavity 802 is coaxially sleeved with the lower mold washer 4 and a plurality of outer cavity channels 8024 penetrate through the side wall of the cooling outer cavity 802. The cooling inner cavity 801 is coaxially sleeved inside the cooling outer cavity 802 and a plurality of inner cavity channels are provided on the outer surface of the cooling inner cavity 801. One end of the inner cavity channel is a coolant inlet and the other end of the inner cavity channel communicates with the outer cavity channel 8024. And when the molds are closed, the upper end of the cooling outer cavity 802 is coaxially sleeved with the upper mold and the top surface of the cooling outer cavity 802 abuts against the upper mold.

[0039] When the molds are closed, the cooling outer cavity 802 abuts against the upper mold in the axial direction. The mold closing force generated by the mutual collision of the upper and lower molds directly acts on the lower mold washer through the cooling outer cavity 802, effectively reducing the influence of the mold closing force on the cooling inner cavity. And the upper end of the cooling outer cavity 802 is coaxially sleeved with the upper mold, further improving the coaxiality of the upper and lower molds and extending the service life of the mold.

[0040] In the present invention, the cooling outer cavity 802 includes an upper positioning boss 8026, and the upper positioning boss 8026 is integrally connected with the cooling outer cavity 802 by welding or is formed by extending from the top of the cooling outer cavity 802; the upper positioning boss 8026 is coaxial with the cooling outer cavity 802, and the upper positioning boss 8026 includes an upper die pressure-receiving surface 807 and a positioning surface 808;

[0041] During mold closing, the upper die pressure-receiving surface 807 abuts against the upper die in the axial direction, and the mold closing force generated by the mutual collision of the upper and lower molds acts directly on the lower die washer 4 through the upper positioning boss 8026 and the cooling outer cavity 802 in sequence, and then acts on the lower die water dividing block 2 through the washer 4, and thus acts on the mold closing piston rod (not shown) that cooperates with the lower die water dividing block 2, effectively reducing the influence of the mold closing force on the cooling inner cavity 801, so that the cooling outer cavity 802 and the cooling inner cavity 801 can be made of different materials respectively;

[0042] During mold closing, the positioning surface 808 abuts against the upper die in the radial direction, and can position the relative position of the upper positioning boss 8026 and the upper die in the radial direction, realizing the coaxial socketing of the upper positioning boss 8026 and the upper die during mold closing, and then sequentially ensuring the coaxiality of the upper die and the cooling outer cavity 802, the cooling outer cavity 802, the washer 4 and the lower die water dividing block 2, and further reducing the deviation between the cooling inner cavity 801 and the upper die and the mold wear during mold closing, improving the accuracy of the molded product and the service life of the mold. Especially when the upper positioning boss 8026 is made of a material with anti-rust performance and good comprehensive mechanical properties, the service life of the mold during long-term use can be further improved.

[0043] In addition, since the cooling outer cavity 802 is coaxial with the lower die washer 4, and the cooling inner cavity 801 is coaxial with the cooling inner cavity 801, that is, on the basis of the coaxiality of the lower die washer 4 and the upper die, the cooling inner cavity 801 in contact with the product is coaxial with the lower die washer 4 only with the cooling outer cavity 802 intervening between them, simplifying the processing and assembly difficulty of the lower die cooling cavity 802, further ensuring the coaxiality of the cooling inner cavity 801 and the upper die after assembly and during use, reducing the deviation between the cooling inner cavity 801 and the upper die and the mold wear during mold closing, and thus improving the accuracy of the molded product and the service life of the mold. It can also effectively ensure the sealing performance after assembly, reduce the leakage during the flow of the cooling liquid, and thus ensure the cooling efficiency.

[0044] Preferably, the upper positioning boss 8026 is a circular ring structure coaxial with the cooling outer cavity 802, and the two are integrally formed or welded and fixed.

[0045] It should be noted that the present invention further includes a locking end cap 1, a lower die water dividing block 2, and a cavity mounting sleeve 3. Among them, the upper and lower ends of the lower die water dividing block 2 are respectively sleeved with a lower die washer 4 and a locking end cap 1, the upper and lower ends of the cavity mounting sleeve 3 are respectively sleeved with a lower die cooling cavity 8 and a locking end cap 1, and the lower die cooling cavity 8 is clamped between the upper end of the cavity mounting sleeve 3 and the lower die washer 4. And, a water dividing block central channel 201 is provided in the lower die water dividing block 2, a washer channel 401 is provided in the lower die washer 4, the water dividing block central channel 201 is coaxially communicated with the washer channel 401, the upper end of the water dividing block central channel 201 is communicated with the inner cavity channel through the washer channel 401 and the lower end of the water dividing block central channel 201 is communicated with the water inlet pipeline of the compression molding equipment, so that the coolant can flow into the inner cavity channel to cool the lower die cooling cavity 8. And, an annular mounting sleeve channel 301 is provided on the inner side surface of the cavity mounting sleeve 3, a water dividing block top surface channel 202 is provided on the upper surface of the lower die water dividing block 2 and a water dividing block inclined channel 203 is provided inside the lower die water dividing block 2, the outer cavity channel 8024 is sequentially communicated with the annular mounting sleeve channel 301, the water dividing block top surface channel 202, and the water dividing block inclined channel 203, and the water dividing block inclined channel 203 is communicated with the water return pipeline of the compression molding equipment, so that the coolant with an increased temperature after cooling can flow through the water return pipeline to an external heat exchanger for heat exchange and temperature reduction.

[0046] A second O-ring 805 is sleeved between the cavity mounting sleeve 3 and the cooling outer cavity 802, which can improve the sealing performance of the mating surface between the cavity mounting sleeve 3 and the cooling outer cavity 802.

[0047] A third O-ring 806 is sleeved between the cavity mounting sleeve 3 and the lower die water dividing block 2, which can improve the sealing performance of the mating surface between the cavity mounting sleeve 3 and the lower die water dividing block 2.

[0048] In the present invention, a first positioning concave platform 8021 is provided on the lower surface of the cooling outer cavity 802, the first positioning concave platform 8021 is coaxially sleeved with the upper end of the lower die washer 4, thereby ensuring the coaxiality between the cooling outer cavity 802 and the lower die washer 4, and a lower positioning convex platform is provided on the lower die water dividing block 2, the lower positioning convex platform is coaxially sleeved with the lower end of the lower die washer 4. Thus, the coaxial sleeving of the lower die water dividing block 2, the lower die washer 4, and the lower die cooling outer cavity 802 from bottom to top for each part is realized, and better coaxiality is ensured when the lower die parts are assembled themselves.

[0049] The upper surface of the first positioning concave platform 8021 is in contact with the upper surface of the lower die washer 4, and the inner side surface of the first positioning concave platform 8021 is in contact with the outer side surface of the lower die washer 4, which can limit the axial and radial degrees of freedom between the cooling outer cavity 802 and the lower die washer 4. At the same time, it can achieve a sealing effect between the upper surface of the first positioning concave platform 8021 and the upper surface of the lower die washer 4, and between the inner side surface of the first positioning concave platform 8021 and the outer side surface of the lower die washer 4.

[0050] A first O-ring 804 is clamped between the first positioning concave platform 8021 and the lower die washer 4, which can further improve the sealing performance of the mating surface between the first positioning concave platform 8021 and the lower die washer 4 and reduce leakage.

[0051] Optionally, the first O-ring 804 is coaxially sleeved between the inner side surface of the first positioning concave platform 8021 and the outer side surface of the lower die washer 4.

[0052] Preferably, the first O-ring 804 is coaxially sleeved between the upper surface of the first positioning concave platform 8021 and the upper surface of the lower die washer 4.

[0053] In the present invention, a second positioning concave platform 8022 is provided on the inner side surface of the cooling outer cavity 802, and an inner cavity convex platform 8011 is provided on the outer side surface of the cooling inner cavity 801. The second positioning concave platform 8022 and the inner cavity convex platform 8011 are coaxially sleeved, thereby ensuring the coaxiality between the cooling inner cavity 801 and the cooling outer cavity 802, and further ensuring the coaxiality of the cooling inner cavity 801, the cooling outer cavity 802, and the lower die washer 4.

[0054] Specifically, the outer side surface of the inner cavity convex platform 8011 is in contact with the inner side surface of the second positioning concave platform 8022, which can limit the relative degree of freedom of the inner cavity convex platform 8011 in the radial direction, and further ensure the coaxiality between the cooling inner cavity 801 and the cooling outer cavity 802 after assembly.

[0055] The lower surface of the inner cavity convex platform 8011 is on the same horizontal plane as the lower surface of the cooling inner cavity 801. And the upper and lower surfaces of the inner cavity convex platform 8011 are respectively in contact with the upper surface of the second positioning concave platform 8022 and the upper surface of the lower die washer 4. Also, the inner cavity convex platform 8011 is coaxial with the cooling inner cavity 801 and the two are fixedly connected.

[0056] In the present invention, the inner cavity channel includes a plurality of transverse channels 8014 and a plurality of longitudinal channels 8012. Among them, the transverse channels 8014 are arranged on the lower surface of the cooling inner cavity 801, and the plurality of longitudinal channels 8012 are arranged around the outer side surface of the cooling inner cavity 801. One end of the transverse channel 8014 is a coolant inlet, and the other end of the transverse channel 8014 is communicated with the longitudinal channel 8012 and the outer cavity channel 8024 in sequence, ensuring the cooling uniformity of the cooling inner cavity 801.

[0057] Specifically, both the transverse channels 8014 and the longitudinal channels 8012 are groove-shaped structures. When the cooling inner cavity 801, the cooling outer cavity 802, and the lower die washer 4 are assembled into one body, the lower surface of the cooling inner cavity 801 fits with the upper surface of the lower die washer 4, which can effectively prevent the coolant from leaking to the mating surface between the cooling inner cavity 801 and the lower die washer 4, ensuring that the coolant flows along the transverse channels 8014. At the same time, the outer side surface of the cooling inner cavity 801 fits with the inner side surface of the cooling outer cavity 802, which can effectively prevent the coolant from leaking to the mating surface between the cooling inner cavity 801 and the cooling outer cavity 802, ensuring that the coolant flows along the longitudinal channels 8012.

[0058] In the present invention, a guiding concave platform 8023 is arranged on the inner side surface of the cooling outer cavity 802. The guiding concave platform 8023 and the outer side surface of the cooling inner cavity 801 cooperate to form an annular liquid flow space, and the lower end of the longitudinal channel 8012 is communicated with the liquid flow space.

[0059] During the process of the coolant flowing from the transverse channels 8014 into the longitudinal channels 8012, it will first converge into the liquid flow space and fill the entire annular liquid flow space, and then flow into each longitudinal channel 8012. On the one hand, the effect of redistribution can be achieved, so that the number and position of each longitudinal channel 8012 do not need to correspond one by one to each transverse channel 8014, effectively reducing the processing difficulty and the cooling uniformity. On the other hand, the process of the coolant filling the liquid flow space can play a certain buffering effect on the coolant, effectively reducing the impact force of the liquid flow on the mating surface between the cooling outer cavity 802 and the cooling inner cavity 801, and further reducing leakage.

[0060] Preferably, the inner diameters of the first positioning concave platform 8021, the second positioning concave platform 8022, and the guiding concave platform 8023 are sequentially reduced to form a stepped-like structure.

[0061] In the present invention, an annular distribution channel 8025 is arranged on the inner side surface of the cooling outer cavity 802. One end of each outer cavity channel 8024 close to the cooling inner cavity 801 is communicated with the annular distribution channel 8025, and the upper end of each longitudinal channel 8012 is also communicated with the annular distribution channel 8025.

[0062] One side of the annular distribution channel 8025 away from the outer cavity channel 8024 is open, so that the coolant in the plurality of longitudinal channels 8012 can flow into the annular distribution channel 8025 and fill the entire annular distribution channel 8025, and then flow out of the lower die cooling cavity 8 through the respective outer cavity channels 8024. Thus, the number and positions of the respective longitudinal channels 8012 do not need to correspond one by one to the respective outer cavity channels 8024, effectively reducing the difficulty of machining and assembling each component.

[0063] In the present invention, an O-ring groove 8013 is provided on the inner side surface of the cooling outer cavity 802 or the outer side surface of the cooling inner cavity 801. A fourth O-ring 803 is sleeved in the O-ring groove 8013, which can improve the sealing performance of the fit between the cooling outer cavity 802 and the cooling inner cavity 801, effectively preventing the coolant in the longitudinal channel 8012 from leaking from the mating surface between the cooling outer cavity 802 and the cooling inner cavity 801, ensuring that most or even all of the coolant in the longitudinal channel 8012 can enter the outer cavity channel 8024 through the annular distribution channel 8025, and ensuring that the coolant flows along the specified route.

[0064] Among them, as Figure 4 shown, when the fourth O-ring 803 is nested on the cooling outer cavity 802 through the O-ring groove 8013, it can ensure that the upper die pressure surface 807 has a relatively large area, and at the same time effectively reduce the thickness of the inner cavity cover surface 80101, avoiding the influence on the cooling effect of the product caused by the need for a relatively large thickness of the cooling inner cavity 801 for opening the O-ring groove 8013 when the fourth O-ring 803 is nested on the cooling inner cavity 801.

[0065] In the present invention, the outer cavity channel 8024 is inclined downward along the liquid flow direction, the length direction of the longitudinal channel 8012 is parallel to the axis of the cooling inner cavity 801, and the plurality of transverse channels 8014 diverge from the center of the lower surface of the cooling inner cavity 801 to the surroundings, further improving the cooling uniformity.

[0066] In the present invention, anti-slip teeth 8015 are provided on the inner side surface of the cooling inner cavity 801 and the inner bottom surface of the cooling inner cavity 801 is the cavity bottom 8016. When the mold is closed, the cooling inner cavity 801 is in clearance fit with the upper die, and the rubber material located between the inner side surface of the cooling inner cavity 801 and the outer side surface of the upper die can be compressed into a thin-walled product with anti-slip teeth 8015.

[0067] In the present invention, the cooling inner cavity 801 is made of a material with good thermal conductivity, and the cooling outer cavity 802 and the upper positioning boss 8026 are made of a material with rust prevention performance and good comprehensive mechanical properties. The rubber compound is compression molded through the clearance fit between the cooling inner cavity 801 and the upper die. When the die is closed, the heat generated is exchanged with the coolant through the cooling inner cavity 801 with good thermal conductivity, which can effectively improve the cooling efficiency and shorten the molding cycle of the product. The cooling outer cavity 802 and the upper positioning boss 8026 with rust prevention performance and good comprehensive mechanical properties bear the impact force generated when the die is closed, which can effectively ensure the service life of the lower die cooling cavity 8. Moreover, the upper positioning boss 8026 with good comprehensive mechanical properties can well bear the friction generated when the upper and lower dies are coaxially fitted, effectively improving the coaxiality of the upper die and the cooling outer cavity 802 and the precision of the die product.

[0068] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and the equipment and structures not described in detail should be understood to be implemented in a common manner in the art. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, without departing from the scope of the technical solution of the present invention, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the protection of the technical solution of the present invention.

Claims

1. A composite lower die structure for rapid cooling, comprising a lower die washer (4) and a lower die cooling cavity (8); characterized in that: The lower die cooling cavity (8) includes a cooling outer cavity (802) and a cooling inner cavity (801). Among them, the cooling outer cavity (802) is coaxially sleeved with the lower die washer (4), and multiple outer cavity channels (8024) penetrate through the side wall of the cooling outer cavity (802). The cooling inner cavity (801) is coaxially sleeved inside the cooling outer cavity (802), and multiple inner cavity channels are arranged on the outer surface of the cooling inner cavity (801). One end of the inner cavity channel is a coolant inlet, and the other end of the inner cavity channel communicates with the outer cavity channel (8024). Moreover, when the mold is closed, the upper end of the cooling outer cavity (802) is coaxially sleeved with the upper die, and the top surface of the cooling outer cavity (802) abuts against the upper die.

2. The composite lower die structure for rapid cooling according to claim 1, wherein: The cooling outer cavity (802) includes an upper positioning boss (8026). The upper positioning boss (8026) includes an upper die pressure-receiving surface (807) and a positioning surface (808). When the mold is closed, the upper die pressure-receiving surface (807) abuts against the upper die in the axial direction, and the positioning surface (808) abuts against the upper die in the radial direction.

3. A composite lower die structure for rapid cooling according to claim 1, characterized in that: A first positioning concave platform (8021) is arranged on the lower surface of the cooling outer cavity (802). The first positioning concave platform (8021) is coaxially sleeved with the upper end of the lower die washer (4), and a lower positioning boss is arranged on the lower die water dividing block (2). The lower positioning boss is coaxially sleeved with the lower end of the lower die washer (4).

4. A composite lower die structure for rapid cooling according to claim 3, characterized in that: A second positioning concave platform (8022) is arranged on the inner side surface of the cooling outer cavity (802). An inner cavity boss (8011) is arranged on the outer side surface of the cooling inner cavity (801). The second positioning concave platform (8022) is coaxially sleeved with the inner cavity boss (8011).

5. A composite lower die structure for rapid cooling according to any one of claims 1 to 4, characterized in that: The inner cavity channels include multiple transverse channels (8014) and multiple longitudinal channels (8012). Among them, the transverse channels (8014) are arranged on the lower surface of the cooling inner cavity (801), and multiple longitudinal channels (8012) are arranged in a surrounding manner on the outer side surface of the cooling inner cavity (801). One end of the transverse channel (8014) is a coolant inlet, and the other end of the transverse channel (8014) communicates with the longitudinal channels (8012) and the outer cavity channels (8024) in sequence.

6. The composite lower die structure for rapid cooling according to claim 5, characterized in that: A guiding concave platform (8023) is arranged on the inner side surface of the cooling outer cavity (802). The guiding concave platform (8023) and the outer side surface of the cooling inner cavity (801) cooperate to form an annular liquid flow space. The lower end of the longitudinal channel (8012) communicates with the liquid flow space.

7. A composite lower die structure for rapid cooling according to claim 5, characterized in that: An annular distribution channel (8025) is arranged on the inner side surface of the cooling outer cavity (802). One end of each outer cavity channel (8024) close to the cooling inner cavity (801) communicates with the annular distribution channel (8025), and the upper end of each longitudinal channel (8012) communicates with the annular distribution channel (8025).

8. A composite lower die structure for rapid cooling according to any one of claims 1 to 4, characterized in that: An O-ring groove (8013) is arranged on the inner side surface of the cooling outer cavity (802) or the outer side surface of the cooling inner cavity (801). A fourth O-ring (803) is sleeved in the O-ring groove (8013).

9. A composite lower die structure for rapid cooling according to claim 5, characterized in that: The external cavity channel (8024) is arranged to incline downward along the liquid flow direction. The longitudinal channel (8012) has its length direction parallel to the axis of the cooling inner cavity (801). A plurality of the transverse channels (8014) are arranged to diverge from the center of the lower surface of the cooling inner cavity (801) to the surroundings. Moreover, anti-slip teeth (8015) are provided on the inner side surface of the cooling inner cavity (801), and the inner bottom surface of the cooling inner cavity (801) is the cavity bottom (8016).

10. A composite lower die structure for rapid cooling according to any one of claims 2 to 4, characterized in that: The cooling inner cavity (801) is made of a material with good thermal conductivity. The cooling outer cavity (802) and the upper positioning boss (8026) are made of a material with anti-rust performance and good comprehensive mechanical properties.

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