Cyclic heating compression molding die

Abstract

The invention discloses a cyclic heating compression molding die, which comprises a die base, a base heating cavity, a pressing plate, a pressing plate and a pressing plate, a forming cavity axially penetrating through the mold cavity is formed in the mold cavity, and a mold cavity heating cavity is formed in the outer side of the forming cavity; the mold cavity is arranged on the mold base, so that the mold base can block the first end of the forming cavity; and the mold core can be inserted into the forming cavity from the second end of the forming cavity, and a mold core heating runner is arranged in the mold core. A to-be-formed material in the forming cavity can be better heated, and the heating efficiency is improved; and meanwhile, the temperature difference of different positions in the forming cavity can be reduced, the forming requirements of high polymer materials, semiconductor packaging materials and the like on temperature-sensitive materials are met, and the problem that the materials are degraded or cured unevenly due to local overheating is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and specifically refers to a cyclic heating press molding mold. Background Art

[0002] Under the background of the continuous growth of the global economy and the rapid iteration of technology, the research and development of new materials has become the core driving force for promoting the development of strategic industries such as aerospace, electronic information, new energy, and biomedicine. High-performance polymer materials represented by new energy vehicle battery separator materials, lightweight and high-strength composite materials for aerospace, and semiconductor chip packaging materials, their research and development processes directly affect the technological innovation and industrial upgrading of the industry.

[0003] Precise and efficient small sample preparation in the process of new material research and development is the core link to verify the material properties, which also highlights the importance of the adapted molding mold technology. In this context, small sample preparation, as the key link for new material property verification, has put forward unprecedentedly strict requirements for the temperature control accuracy, pressure stability, and process flexibility of the molding mold.

[0004] However, most of the existing molding molds adopt heating modes with external heating elements such as electric heating rods and resistance wires, with a slow heating rate (usually <1 °C / s) and poor temperature field uniformity (the temperature difference at different positions of the cavity can reach 5 - 10 °C). Summary of the Invention

[0005] The purpose of the present invention is to solve the above problems, and provides a cyclic heating press molding mold, which uses cyclic liquid heating, and the liquid temperature can be effectively controlled within ±0.5 °C to provide a uniform temperature field for the mold.

[0006] The purpose of the present invention is achieved through the following technical solutions: A cyclic heating press molding mold, comprising:

[0007] A mold base, which is internally provided with a base heating cavity;

[0008] A mold cavity, which is internally provided with a forming cavity axially penetrating it, and a mold cavity heating cavity is arranged outside the forming cavity; The mold cavity is arranged on the mold base so that the mold base can block the first end of the forming cavity;

[0009] A mold core, which can be inserted into the forming cavity from the second end of the forming cavity, and a mold core heating flow channel is arranged inside the mold core.

[0010] In the present invention, hot runners for circulating hot fluid are provided on the mold base, the mold cavity, and the mold core. These hot runners surround the forming cavity, enabling better heating of the material to be formed in the forming cavity and improving the heating efficiency. At the same time, since the hot runners surround the forming cavity, they can reduce the temperature difference at different positions in the forming cavity, meeting the forming requirements of temperature-sensitive materials such as polymer materials and semiconductor packaging materials, and avoiding problems such as material degradation or uneven curing caused by local overheating.

[0011] A gas flow channel is further provided in the mold core. A gas diversion port is provided at one end of the mold core inserted into the forming cavity, and the gas flow channel communicates with the forming cavity via the gas diversion port.

[0012] High-pressure gas can be introduced into the forming cavity through the gas flow channel and the gas diversion port. Non-contact demolding can be achieved under the action of air pressure, avoiding damage to the formed part. At the same time, the introduced gas can form a gas film between the mold core and the cavity wall of the forming cavity, facilitating the separation of the mold core from the mold cavity.

[0013] A spacer for defining the depth of insertion of the mold core into the forming cavity is installed on the mold cavity. Through the limiting action of the spacer, the mold core is in a fixed position to keep the material in the forming cavity under stable pressure and ensure the forming quality. At the same time, the thickness of the formed part and its density can be adjusted by adjusting the thickness of the spacer.

[0014] A boss for blocking the first end of the forming cavity is provided on the mold base. The setting of the boss can better block the forming cavity to prevent the material in the forming cavity from leaking out. At the same time, the boss also plays a positioning role, enabling more accurate and rapid fitting and assembly between the mold cavity and the mold base.

[0015] The mold cavity is detachably installed on the mold base through a connecting member to facilitate the demolding of the formed part.

[0016] Hot fluid connectors are provided at the inlet end and the outlet end of the hot runner of the mold core, the inlet end and the outlet end of the heating cavity of the mold cavity, and the inlet end and the outlet end of the heating cavity of the base.

[0017] Gas connectors are provided at the inlet end and the outlet end of the gas flow channel.

[0018] The mold core includes an end plate and a core body connected to each other. The core body is inserted into the forming cavity from the second end of the forming cavity, and the spacer is provided between the end plate and the mold cavity.

[0019] The mold cavity includes an inner cylinder, an outer cylinder sleeved outside the inner cylinder, and two sealing plates respectively provided at both ends of the inner cylinder and the outer cylinder. The inner cylinder, the outer cylinder, and the two sealing plates jointly enclose the heating cavity of the mold cavity, and the internal cavity of the inner cylinder forms the forming cavity.

[0020] The spacer block includes two detachably connected spacer block units. Setting the spacer block to be detachable facilitates installation and disassembly.

[0021] Compared with the prior art, the present application has the following beneficial effects: By arranging a hot runner around the molding cavity and circulating hot fluid into the hot runner, it can better heat the material to be molded in the molding cavity and improve the heating efficiency. At the same time, the hot runner surrounds the molding cavity, which can reduce the temperature difference at different positions in the molding cavity, meet the molding requirements of temperature-sensitive materials such as polymer materials and semiconductor packaging materials, and avoid problems such as material degradation or uneven curing caused by local overheating.

[0022] Some additional features of the present application can be described below. Through the inspection of the following description and the corresponding drawings, or the understanding of the production or operation of the embodiments, some additional features of the present application are obvious to those skilled in the art. The features disclosed in the present application can be realized and achieved through the practice or use of various methods, means and combinations of the specific embodiments described below. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments and descriptions thereof of the present application are used to explain the present application and do not constitute a limitation to the present application. In each figure, the same reference numerals represent the same components. Among them,

[0024] Figure 1 is the structural diagram of the present invention.

[0025] Figure 2 is Figure 1 the sectional view at A-A in

[0026] Figure 3 is Figure 1 the sectional view at B-B in

[0027] Figure 4 is the structural diagram of the mold core of the present invention.

[0028] Figure 5 is the structural diagram of the spacer block of the present invention.

[0029] Figure 6 is the structural diagram of the mold cavity of the present invention.

[0030] Figure 7 is the sectional view of the mold cavity of the present invention.

[0031] The reference numerals in the above-mentioned drawings are as follows: 10 - core, 11 - core heating runner, 12 - gas diversion port, 13 - gas joint, 14 - gas runner, 15 - end plate, 16 - core body, 20 - spacer block, 30 - mold cavity, 31 - mold cavity heating chamber, 32 - forming cavity, 33 - outer cylinder, 34 - inner cylinder, 35 - sealing plate, 40 - mold base, 41 - base heating chamber, 42 - boss, 50 - formed part, 60 - connecting piece, 70 - hot fluid joint. Detailed implementation manners

[0032] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0033] It should be noted that if the terms "first", "second", etc. are involved in the description of the specification, claims and the above-mentioned drawings of this application, they are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of this application described here. In addition, if the terms "including" and "having" and any variations thereof are involved, the intention is to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0034] In this application, if terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", etc. are involved, the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe this application and its embodiments, and are not used to limit that the indicated devices, elements or components must have a specific orientation or be constructed and operated in a specific orientation.

[0035] Moreover, in addition to being able to represent an orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0036] In addition, in this application, terms such as "installation", "setting", "provided with", "connection", "connected", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The following will detail this application with reference to the drawings and in combination with the embodiments.

[0038] Embodiment

[0039] As Figure 1 shown, this embodiment discloses a cyclic heating and pressing forming die, including: a die base 40, a die cavity 30 and a die core 10. Among them, as Figure 2 shown, a base heating cavity 41 is provided inside the die base 40, and an inlet end and an outlet end communicating with the base heating cavity 41 are opened on the side wall of the die base 40. The inlet end and the outlet are respectively distributed on both sides of the central axis of the die base 40 and are arranged vertically offset. Heat fluid connectors 70 are respectively arranged on the inlet end and the outlet end. Specifically, when setting, the heat fluid connector 70 can be realized by using a pagoda nozzle connector, and the pagoda nozzle connector can be quickly connected to an external heating device, such as a constant temperature oil bath. During use, the heating medium enters the base heating cavity 41 from the heat fluid connector 70 at the inlet end. After heat exchange, the heating medium then flows out of the base heating cavity 41 from the heat fluid connector 70 at the outlet end, and after being heated by an external device, it is circulated and supplied into the base heating cavity 41 again.

[0040] As Figure 2 shown, a forming cavity 32 is provided inside the die cavity 30, and the forming cavity 32 axially penetrates the die cavity 30; correspondingly, a die cavity heating cavity 31 is provided outside the forming cavity 32. Specifically, as Figure 6 , 7 shown, the die cavity 30 includes an inner cylinder 34, an outer cylinder 33 sleeved outside the inner cylinder 34, and two sealing plates 35 respectively arranged at both ends of the inner cylinder 34 and the outer cylinder 33. Among them, the inner cylinder 34, the outer cylinder 33 and the two sealing plates 35 jointly enclose the above-mentioned die cavity heating cavity 31, and the internal cavity of the inner cylinder 34 forms the above-mentioned forming cavity 32.

[0041] Similar to the mold base 40, the outer cylinder 33 is also provided with an inlet end and an outlet end communicating with the mold cavity heating chamber 31 on its cylinder wall, and heat fluid connectors 70 are also provided on the inlet end and the outlet end. The setting methods of the inlet end and the outlet end on the mold cavity heating chamber 31 are the same as those on the base heating chamber 41, and will not be elaborated here.

[0042] During installation, the mold cavity 30 is installed on the mold base 40 so that the mold base 40 can block the first end of the molding cavity 32. Specifically, as Figure 2 shown, a boss 42 is provided on the mold base 40. During installation, the lower end of the mold cavity 30 is installed on the mold base 40, and the boss 42 is snapped into the lower end of the molding cavity 32. The provision of the boss 42 can better block the molding cavity 32 and prevent the material in the molding cavity 32 from leaking out. At the same time, the boss 42 also plays a positioning role, enabling the mold cavity 30 and the mold base 40 to be assembled more accurately and quickly.

[0043] In addition, the mold cavity 30 can be detachably installed on the mold base 40 through a connecting member 60. Specifically, the connecting member 60 can be a screw. After the mold cavity 30 is installed on the mold base 40, the mold cavity 30 and the mold base 40 are locked with screws. Setting the mold cavity 30 and the mold base 40 to be detachable facilitates the demolding of the molded part 50.

[0044] The mold core 10 can be inserted into the molding cavity 32 from the second end of the molding cavity 32, that is, the lower end of the mold core 10 can be inserted into the molding cavity 32 from the upper end of the molding cavity 32. As Figure 2 shown, a mold core heating runner 11 is provided in the mold core 10, and the mold core heating runner 11 can be distributed in a folded manner along the axial direction of the mold core 10 so that both the inlet end and the outlet end of the mold core heating runner 11 are located at the upper end of the mold core 10. Similarly, heat fluid connectors 70 are also provided at both the inlet end and the outlet end of the mold core heating runner 11 for connection to an external heating device.

[0045] With the above structure, during use, first assemble the mold cavity 30 and the mold base 40, then add the material to be molded into the molding cavity 32, and then insert the mold core 10 into the molding cavity 32. Circulate a liquid heating medium, such as water or heat-conducting oil, into the base heating cavity 41, the mold cavity heating cavity 31, and the mold core heating runner 11 respectively through an external heating device, and heat the material in the molding cavity 32 by means of heat exchange. At the same time, apply pressure to the mold core 10 to press and mold the material in the molding cavity 32. In this embodiment, heat runners for the circulation of the heat medium are provided on the mold base 40, the mold cavity 30, and the mold core 10. These heat runners surround the molding cavity 32, so that the material to be molded in the molding cavity 32 can be heated better, and the heating efficiency is improved. At the same time, the heat runners surround the molding cavity 32 and adopt the heating method of circulating liquid. The liquid temperature can be effectively controlled within ±0.5°C, providing a uniform temperature field for the mold, reducing the temperature difference at different positions in the molding cavity 32, meeting the molding requirements of temperature-sensitive materials such as polymer materials and semiconductor packaging materials, avoiding problems such as material degradation or uneven curing caused by local overheating, and also improving the temperature control accuracy of the mold.

[0046] As another implementation manner of this embodiment, as Figure 2 shown, a spacer block 20 for limiting the insertion depth of the mold core 10 into the molding cavity 32 is installed on the mold cavity 30. As Figure 4 shown, specifically, the mold core 10 includes an end plate 15 and a core body 16 connected to each other. In this case, both the inlet end and the outlet end of the mold core heating runner 11 can be located on the end plate 15. In the installed state, the core body 16 is inserted into the molding cavity 32 from the upper end of the molding cavity 32, and the spacer block 20 is arranged between the end plate 15 and the mold cavity 30. Due to the abutting effect of the spacer block 20 on the end plate 15, the insertion depth of the mold core 10 into the molding cavity 32 can be limited. In addition, as Figure 5 shown, the spacer block 20 includes two detachably connected spacer block units. A hole for the core body 16 to pass through is formed between the two spacer block units, and the two spacer block units can be connected together by screws. In this embodiment, the spacer block 20 is set to be detachable, which is convenient for installing and removing the spacer block 20; in addition, by limiting the insertion depth of the mold core 10 into the molding cavity 32 with the spacer block 20, when pressure is applied to the mold core 10 during the molding process, the mold core 10 can be in a fixed position to keep the material in the molding cavity 32 under stable pressure and ensure the molding quality. During specific implementation, the insertion depth of the mold core 10 into the molding cavity 32 can be adjusted by replacing the adjusting spacer block 20 with different thicknesses, and thus the molding thickness and density of the molded part 50 can be adjusted.

[0047] To facilitate the demolding of the molded part 50, as Figure 3As shown, as another implementation, a gas flow channel 14 is further provided in the mold core 10, and a gas diversion port 12 is provided at one end of the mold core 10 inserted into the molding cavity 32. The gas flow channel 14 communicates with the molding cavity 32 via the gas diversion port 12. Specifically, the gas diversion ports 12 can be evenly distributed along the circumferential direction of the mold core 10. Similarly, the gas flow channel 14 can also be distributed in a folded-back manner along the axial direction of the mold core 10, so that the inlet end and the outlet end of the gas flow channel 14 are also located on the end plate 15. Gas connectors 13 can be provided at both the inlet end and the outlet end of the gas flow channel 14 to facilitate quick connection to external gas supply equipment.

[0048] During demolding, first separate the mold cavity 30 from the mold base 40, and then introduce high-pressure gas into the gas flow channel 14. The gas in the gas flow channel 14 is evenly ejected from the gas diversion ports 12 into the molding cavity 32, and under the action of air pressure, the molded part 50 is pushed out from the lower end of the molding cavity 32, realizing non-contact demolding and avoiding damage to the molded part 50. In addition, the introduced gas can form a gas film between the mold core 10 and the cavity wall of the molding cavity 32, facilitating the withdrawal of the mold core 10 from the mold cavity 30.

[0049] The overall structure design of the molding die in this embodiment is simple and compact, effectively reducing the die design cost and production cycle. The die base 40, the die cavity 30, the die core 10, and the spacer block 20 can all be made of high-quality aluminum alloy 5083. This material has good thermal conductivity and can ensure uniform heat conduction of the die during the material forming process. Combined with the hot runner surrounding the forming cavity 32, a short-path heat conduction system of "heat source - die - material" is constructed. In addition, the circulating liquid heating medium (such as water or heat-conducting oil) forms a closed loop through the hot runner inlet and outlet. Utilizing the characteristics of large specific heat capacity of the liquid (such as water reaching 4.2 kJ / (kg·°C)) and strong temperature controllability, precise temperature control of ±0.5°C is achieved; the heating rate of the liquid circulation heating system can reach 5°C / s (traditional electric heating wire heating <1°C / s). Combined with the high thermal conductivity characteristics of the die material, it only takes 40 seconds to rise from room temperature to 200°C (the prior art requires more than 5 minutes), greatly improving the heating efficiency; the die base 40, the die cavity 30, and the die core 10 can be quickly assembled, and the structure can be assembled and disassembled without professional tools; overall, the single forming cycle of the molding die in this embodiment is shortened from 10 - 30 minutes of the traditional die to 4 - 8 minutes, enabling high-frequency tests and meeting the requirements of "small batch, multiple iterations" in new material research and development. When setting up this embodiment, a miniaturized design can be adopted, which is convenient for preparing small samples, reducing material loss in the research and development stage. The single forming material consumption is reduced from several hundred grams to 5 - 20 grams. Combined with the high-pressure gas demolding technology, it avoids sample damage caused by manual demolding, and the material loss rate is reduced from 30% to less than 5%, significantly reducing the material cost of new material research and development. In addition, by adjusting the thickness of the spacer block 20, it can support the preparation of small samples with a thickness of 0.5 - 5 mm. During the research and development stage, there is no need to prepare exclusive dies for different materials. Only by replacing the spacer block 20 with different thicknesses can the thickness and density parameters of the product be adjusted.

[0050] It should be noted that all the features disclosed in this specification, or all the steps in the disclosed methods or processes, except for mutually exclusive features and / or steps, can be combined in any way.

[0051] In addition, the above specific embodiments are exemplary. Those skilled in the art can come up with various solutions inspired by the disclosed content of the present invention, and these solutions also belong to the disclosed scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the description and drawings of the present invention are illustrative and do not constitute a limitation on the claims. The protection scope of the present invention is defined by the claims and their equivalents.

Claims

1. A cyclic heating press forming die, characterized in that Comprising: A mold base (40) with a base heating cavity (41) provided inside thereof; A mold cavity (30) with a forming cavity (32) axially penetrating therethrough, and a mold cavity heating cavity (31) provided outside the forming cavity (32); the mold cavity (30) is arranged on the mold base (40) so that the mold base (40) can block the first end of the forming cavity (32); A mold core (10) that can be inserted into the forming cavity (32) from the second end of the forming cavity (32), and a mold core heating runner (11) is provided inside the mold core (10).

2. The cyclic heating and pressing forming die according to claim 1, wherein A gas runner (14) is further provided inside the mold core (10), a gas diversion port (12) is provided at one end of the mold core (10) inserted into the forming cavity (32), and the gas runner (14) communicates with the forming cavity (32) via the gas diversion port (12).

3. The cyclic heating and pressing forming die according to claim 1 or 2, characterized in that A spacer block (20) for defining the depth of insertion of the mold core (10) into the forming cavity (32) is installed on the mold cavity (30).

4. The cyclic heating and pressing forming die according to claim 1, characterized in that, A boss (42) for blocking the first end of the forming cavity (32) is provided on the mold base (40).

5. The cyclic heating press forming die according to claim 1, characterized in that, The mold cavity (30) is detachably installed on the mold base (40) through a connecting member (60).

6. The circulating heating press molding die according to claim 1, wherein Thermal fluid connectors (70) are provided at the inlet end and outlet end of the mold core heating runner (11), the inlet end and outlet end of the mold cavity heating cavity (31), and the inlet end and outlet end of the base heating cavity (41).

7. The cyclic heating press forming die according to claim 2, characterized in that, Gas connectors (13) are provided at the inlet end and outlet end of the gas runner (14).

8. The cyclic heating and pressing forming die according to claim 3, characterized in that, The mold core (10) includes an end plate (15) and a core body (16) connected to each other; the core body (16) is inserted into the forming cavity (32) from the second end of the forming cavity (32), and the spacer block (20) is arranged between the end plate (15) and the mold cavity (30).

9. The cyclic heating and pressing forming die according to claim 1, wherein The mold cavity (30) includes an inner cylinder (34), an outer cylinder (33) sleeved outside the inner cylinder (34), and two sealing plates (35) respectively arranged at both ends of the inner cylinder (34) and the outer cylinder (33); the inner cylinder (34), the outer cylinder (33) and the two sealing plates (35) jointly enclose the mold cavity heating cavity (31), and the internal cavity of the inner cylinder (34) forms the forming cavity (32).

10. The cyclic heating and press forming die according to claim 3, wherein, The spacer block (20) includes two detachably connected spacer block units.

Images