Die for 3D deep drawing of deep diaphragm

Abstract

The mold comprises an upper mold plate, a carrier plate used for bearing the diaphragm, a floating plate, a flexible heating fixing plate and a lower mold plate which are sequentially arranged, a mold core is arranged in the floating plate, the floating plate is in sliding fit with the mold core, a profiling molded surface matched with the diaphragm is arranged on the mold core, and the flexible heating fixing plate is arranged on the lower mold plate. The mold core is provided with a deep groove facing the flexible heating fixing plate, the distance between the bottom surface part of the deep groove and the corresponding part of the surface of the profiling molding surface is consistent, the flexible heating fixing plate extends to form a heating fixing convex block matched with the deep groove, and the heating fixing convex block is matched with the deep groove. A heating mounting groove is formed in the heating fixing convex block, a flexible heating rod is embedded in the heating mounting groove, and the height between the flexible heating rod and the corresponding area of the profiling molded surface molded product area is equal; by means of the mode, the membrane can be stretched to a large extent, and the problems that the membrane is broken, thinned and the like are solved.

Description

Technical Field

[0001] The invention relates to the technical field of diaphragm stretching and forming dies, and in particular to a die for 3D deep-drawn diaphragms. Background Art

[0002] In the process of high pressure forming of diaphragms, the heating unit of conventional molds is a heating rod inserted into the bottom of the mold core, radiating heat to each surface of the 3D mold core in the form of a 2D plane. The temperature distribution on the surface in the height direction of the mold core is uneven, and the baking carrier of the diaphragm is flat. Therefore, only some shallowly stretched diaphragms can be made, and the drawing height can usually only be within 5mm;

[0003] When the 3D diaphragm needs to be stretched to a deeper height, conventional heating will cause a large difference in the surface temperature of the mold core, resulting in uneven heating of the products, such as cracking during deep drawing or thinning, distortion, and large size differences. Therefore, conventional molds can only produce some low-drawn products and cannot produce products with larger stretch depths. Summary of the invention

[0004] The main technical problem solved by the present invention is to provide a mold for 3D deep drawing diaphragms, which can stretch the diaphragms to a large extent without causing the diaphragms to rupture, become thinner, and other problems.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a mold for 3D deep drawing diaphragm, including: an upper template, a carrier plate for carrying the diaphragm, a floating plate, a flexible heating fixed plate, and a lower template arranged in sequence, a mold core is arranged in the floating plate, the floating plate and the mold core are slidably matched, and a copy molding surface matching with the diaphragm is arranged on the mold core, the copy molding surface enables the diaphragm to replicate the 3D shape to form a product, a deep groove is opened in the mold core toward the flexible heating fixed plate, and the bottom part of the deep groove is at the same distance from the corresponding part of the copy molding surface surface, the flexible heating fixed plate is extended with a heating and fixing protrusion matching with the deep groove, a heating installation groove is opened on the heating and fixing protrusion, a flexible heating rod is embedded in the heating installation groove, and the height between the flexible heating rod and the corresponding area of ​​the copy molding surface forming product area is equidistant.

[0006] Preferably, the carrier plate is provided with an avoidance hole, and a plurality of positioning pins are arranged around the avoidance hole. The positioning pins pass through the edge of the diaphragm to limit the position of the diaphragm on the carrier plate.

[0007] Preferably, both ends of the carrier are provided with pre-bending parts, and the shape of the surface of the pre-bending parts matches the contoured molding surface, so that when the membrane is attached to the carrier, the membrane is pre-bent by the pre-bending parts, thereby pre-forming the membrane.

[0008] Preferably, the carrier plate is movably arranged on the floating plate, and an annular limiting flange matching the inner diameter of the avoidance hole is arranged on the floating plate. When the carrier plate contacts the floating plate, the annular limiting flange is used to limit the position of the carrier plate on the floating plate.

[0009] Preferably, a positioning groove is formed on one side of the pre-bent portion away from the diaphragm, and a positioning protrusion is axially extended from the floating plate toward the positioning groove. The positioning protrusion cooperates with the positioning groove to limit and position the carrier plate on the floating plate.

[0010] Preferably, an air inlet hole is opened on the upper template, and the upper template cover is arranged on the carrier plate. When the mold is closed, a sealed chamber is formed between the upper template and the carrier plate, and the air inlet hole is connected with the sealed chamber.

[0011] Preferably, a sealing ring is provided between the upper mold plate and the carrier plate, and the sealing ring is used to seal the chamber when the mold is closed.

[0012] Preferably, a temperature sensor is vertically arranged on the lower mold plate, and the temperature sensor passes through the heating fixing block and contacts the mold core, so as to monitor the temperature of the mold core.

[0013] Preferably, an assembly groove is provided on the lower template, and the flexible heating fixing plate is installed in the assembly groove.

[0014] Preferably, a side insulation plate is provided on the side periphery of the flexible heating fixing plate, and a bottom insulation plate is provided on the bottom surface of the flexible heating fixing plate.

[0015] The beneficial effects of the present invention are:

[0016] 1. By making the specific locations between the flexible heating rod and the upper surface of the mold core equal, the heat is transferred to the surface of the mold core in a balanced manner, thereby heating the diaphragm, especially the lower surface of the diaphragm, more evenly, and the high-temperature and high-pressure gas acts on the upper surface of the diaphragm, thereby heating the upper surface of the diaphragm and making the diaphragm replicate the shape of the mold core, and then forming the diaphragm to obtain the product, reducing the problem of cracking caused by uneven heating when the diaphragm is 3D molded. In addition, the temperature fluctuation is very small in heating;

[0017] 2. Through the pre-bending part on the carrier, the diaphragm is pre-bent in a cold state when it is fixed on the carrier, so as to perform pre-forming. At this time, bending the diaphragm will not cause a significant change in the thickness of the diaphragm. The stretching height of the diaphragm is reduced during the subsequent heating and mold forming process of the diaphragm. Through this pre-bending, the stretching height is reduced to the minimum. Therefore, the stretching height of the high-pressure and high-temperature air blown in the last step will not be too high, so as to obtain a product with balanced thickness and high stretching. Compared with the traditional method, this mold technology can stretch the product (diaphragm) to a high depth, and the stretching height can reach 30mm to 150mm. And the thickness change of the product (diaphragm) can be controlled within 10%, breaking through the bottleneck problem of the IML process. In addition, this technology is highly reliable and stable in the production process, saving resources, reducing waste, and improving efficiency and yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the decomposition of the diaphragm in the present invention when it is not bent;

[0020] Figure 3 It is a schematic diagram of the decomposition of the belt when the membrane is pre-bent and formed in the present invention;

[0021] Figure 4 It is a schematic diagram of the decomposition of the diaphragm when it is completely formed in the present invention;

[0022] Figure 5 It is a structural schematic diagram of the bottom surface of the mold core of the present invention.

[0023] The markings of the components in the accompanying drawings are as follows:

[0024] 1. Upper template; 11. Air inlet; 12. Sealing ring;

[0025] 2. Carrier plate; 21. Avoidance hole; 22. Positioning pin; 23. Pre-bending part;

[0026] 3. floating plate; 31. annular limiting flange; 32. positioning protrusion;

[0027] 4. Flexible heating fixing plate; 41. Heating fixing protrusion; 42. Flexible heating rod; 43. Side insulation plate;

[0028] 5. Lower template; 51. Temperature sensor;

[0029] 6. Mold core; 61. Profiling molding surface; 62. Deep groove;

[0030] 7. Diaphragm; 71. Product. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0032] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0037] Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities of the International System of Units, or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation or integration.

[0038] Example:

[0039] refer to Figure 1-Figure 5 A mold for a 3D deep-drawn diaphragm comprises: an upper template 1, a carrier plate 2 for carrying a diaphragm 7, a floating plate 3, a flexible heating fixed plate 4, and a lower template 5 which are arranged in sequence. A mold core 6 is arranged in the floating plate 3. The floating plate 3 and the mold core 6 are slidably matched, so that the floating plate 3 can be separated from the mold core 6. A profiling molding surface 61 which matches the desired molded product 71 on the diaphragm 7 is opened on the mold core 6. The profiling molding surface 61 enables the diaphragm 7 to replicate the 3D shape so as to form a part of the desired product 71. The mold core 6 is provided with a deep groove 62 toward the flexible heating fixed plate 4. The distance from the bottom surface of the deep groove 62 to the corresponding surface of the profiling molding surface 61 is consistent. The flexible heating fixed plate 4 is provided with a deep groove 62. The fixing plate 4 extends with a heating fixing protrusion 41 that matches the deep groove 62. The heating fixing protrusion 41 is provided with a heating installation groove, in which a flexible heating rod 42 is embedded. The heights of the flexible heating rod 42 and the corresponding areas of the molding product 71 of the imitation molding surface 61 are equidistant, that is, the height distances from the flexible heating rod 42 to various locations on the surface of the imitation molding surface 61 of the mold core 6 are kept equidistant, so that heat can be radiated to the surface of the imitation molding surface 61 of the mold core 6 more evenly and balancedly, thereby heating the diaphragm 7, especially the lower surface of the diaphragm 7, more evenly and quickly, thereby reducing problems such as cracking caused by uneven heating when the diaphragm 7 is 3D molded.

[0040] refer to Figure 2-Figure 4 The carrier plate 2 is provided with an avoidance hole 21, and a plurality of positioning pins 22 are arranged around the avoidance hole 21. The positioning pins 22 pass through the long waist holes at the edge of the diaphragm 7 to limit the position of the diaphragm 7 on the carrier plate 2, so that the position of the diaphragm 7 on the carrier plate 2 is fixed by the positioning pins 22, and the diaphragm 7 can directly contact the contoured molding surface 61 of the mold core 6 through the avoidance hole 21.

[0041] refer to Figure 1-4 , pre-bending parts 23 are formed at both ends of the carrier plate 2, and the shape of the surface of the pre-bending parts 23 matches the contoured molding surface 61, so that when the diaphragm 7 is attached to the carrier plate 2 and pressed on the upper mold plate 1, the two ends of the diaphragm 7 are pre-bent in cooperation with the pre-bending parts 23, thereby forming a pre-bending of the diaphragm 7 as a whole, so that the diaphragm 7 can be pre-formed. By pre-cold forming the diaphragm 7 without changing its thickness, that is, bending the diaphragm 7 into a preliminary 3D shape in a cold state, the stretching amount of the diaphragm 7 when it is completely formed when the mold is completely closed is reduced. In this way, compared with conventional technologies, the diaphragm 7 can be stretched more highly as a whole without wrinkles, ruptures, uneven thickness, etc. while ensuring that the thickness of the diaphragm 7 remains unchanged or changes very little.

[0042] refer to Figure 2-Figure 4 In order to better fix the diaphragm 7 and thus better preform the diaphragm 7 , a positioning pin 22 is also installed on the pre-bending portion 23 .

[0043] refer to Figure 2-Figure 4 The carrier plate 2 is movably placed on the floating plate 3, and an annular limiting flange 31 is extended from the floating plate 3 to match the inner diameter of the avoidance hole 21, so that the floating plate 3 can block the avoidance hole 21 of the limiting carrier plate 2 through the annular limiting flange 31, so that when the carrier plate 2 contacts the floating plate 3, the annular limiting flange 31 limits the position of the carrier plate 2 on the floating plate 3, preventing the carrier plate 2 from shaking on the floating plate 3 at will.

[0044] refer to Figure 1-Figure 4 A positioning groove is formed on the side of the pre-bent portion 23 away from the diaphragm 7, and a positioning protrusion 32 extends axially toward the positioning groove on the floating plate 3. The positioning protrusion 32 cooperates with the positioning groove to further clamp and limit the position of the positioning carrier plate 2 on the floating plate 3, further increasing the accuracy of the relative position between the carrier plate 2 and the floating plate 3.

[0045] refer to Figure 1-Figure 4The upper mold plate 1 is provided with an air inlet 11, which is covered on the carrier plate 2. When the mold is closed, a sealed chamber is formed between the upper mold plate 1 and the carrier plate 2, and the air inlet 11 is connected to the sealed chamber, so that high-temperature and high-pressure gas enters from the air inlet 11 and acts on the upper surface of the diaphragm 7, so that the diaphragm 7 is formed into the shape of the mold core 6 imitating the molding surface 61 when both the upper and lower surfaces of the diaphragm 7 are heated, thereby forming the desired product 71. By heating and molding both the upper and lower surfaces of the diaphragm 7, problems such as cracking caused by uneven heating during 3D molding of the diaphragm 7 can also be further reduced.

[0046] refer to Figure 4 In order to ensure the airtightness of the sealed chamber when the mold is closed and prevent the leakage of high-temperature and high-pressure gas, a sealing ring 12 is provided between the upper template 1 and the carrier plate 2. The sealing ring 12 is installed on the upper template 1. When the mold is closed, the sealing ring 12 is used to seal the chamber.

[0047] refer to Figure 4 In order to further accurately control the temperature of the mold core 6, a temperature sensor 51 is vertically installed on the lower mold plate 5. The temperature sensor 51 passes through the heating fixed block and contacts the mold core 6, thereby monitoring the actual temperature of the mold core 6 and sending a signal to the flexible heating rod 42 to maintain or increase or decrease the temperature.

[0048] refer to Figure 4 An assembly groove is provided on the lower template 5, and the flexible heating fixing plate 4 is installed in the assembly groove. The side periphery of the flexible heating fixing plate 4 is screwed with a side insulation plate 43, and the bottom surface of the flexible heating fixing plate 4 is installed with a bottom insulation plate, thereby isolating the conduction of the temperature of the mold core 6. Therefore, the temperature fluctuation on the surface of the mold core 6 is very small, further ensuring the stability of the molding of the diaphragm 7.

[0049] Mold assembly process: install the side insulation board 43 and the bottom insulation board at the corresponding positions of the flexible heating fixing board 4, then install the flexible heating rod 42 on the flexible heating fixing board 4, then install the temperature sensor 51 on the lower template 5, then install the flexible heating fixing board 4 on the lower template 5, and then install the mold core 6 and the floating plate 3 on the lower template 5 together, so as to complete the overall installation of the lower half mold. Then assemble the sealing ring 12 on the upper template 1, which is the upper half mold. Finally, install the carrier plate 2 on the molding machine bracket.

[0050] Diaphragm forming process: the diaphragm 7 is fixed on the carrier 2 by the positioning needle 22, and the diaphragm 7 is pre-bent and formed by the pre-bending part 23, and then the carrier 2 carrying the diaphragm 7 is placed on the floating plate 3. When the mold is closed, the diaphragm 7 is further cold pre-formed in the process of the upper template 1 pressing the diaphragm 7 on the carrier 2, thereby reducing the stretching height in the subsequent hot forming process. After the mold is closed, the high-temperature and high-pressure gas enters through the air inlet 11 of the upper template 1 and acts on the upper surface of the diaphragm 7, and with the cooperation of the core 6 heating the diaphragm 7 simultaneously, the diaphragm 7 is formed into the shape of the core 6 imitating the forming surface, and then the high-temperature and high-pressure gas is disconnected and the mold is opened, so that the carrier 2 carrying the formed diaphragm 7 is separated from the core 6, and the required product 71 is separated from the formed diaphragm 7, thereby obtaining the product 71 body.

[0051] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A mold for 3D deep drawing diaphragm, characterized in that: include: An upper template (1), a carrier plate (2) for carrying a diaphragm (7), a floating plate (3), a flexible heating fixed plate (4), and a lower template (5) are sequentially arranged, wherein a mold core (6) is arranged in the floating plate (3), the floating plate (3) and the mold core (6) are slidably matched, and a profiling molding surface (61) matching the diaphragm (7) is arranged on the mold core (6), and the profiling molding surface (61) enables the diaphragm (7) to replicate a 3D shape so as to form a product (71), and the mold core (6) faces the flexible heating fixed plate (4). A deep groove (62) is provided, and the bottom surface of the deep groove (62) is at the same distance from the corresponding portion of the surface of the imitation molding surface (61). The flexible heating fixing plate (4) is extended with a heating fixing protrusion (41) that matches the deep groove (62). A heating installation groove is provided on the heating fixing protrusion (41), and a flexible heating rod (42) is embedded in the heating installation groove. The height of the flexible heating rod (42) and the corresponding area of ​​the imitation molding surface (61) forming the product (71) are equidistant.

2. A mold for 3D deep drawing diaphragm according to claim 1, characterized in that: The carrier plate (2) is provided with an avoidance hole (21), and a plurality of positioning pins (22) are arranged around the avoidance hole (21). The positioning pins (22) pass through the edge of the diaphragm (7) to limit the position of the diaphragm (7) on the carrier plate (2).

3. A mold for 3D deep drawing membrane according to claim 2, characterized in that: Pre-bending portions (23) are provided at both ends of the carrier plate (2), and the shape of the surface of the pre-bending portion (23) matches the contoured molding surface (61), so that when the diaphragm (7) is attached to the carrier plate (2), the diaphragm (7) is pre-bent through the pre-bending portion (23), thereby pre-forming the diaphragm (7).

4. A mold for 3D deep drawing membrane according to claim 3, characterized in that: The carrier plate (2) is movably arranged on the floating plate (3); the floating plate (3) is provided with an annular limiting flange (31) matching the inner diameter of the avoidance hole (21); when the carrier plate (2) and the floating plate (3) are in contact, the annular limiting flange (31) is used to limit the position of the carrier plate (2) on the floating plate (3).

5. A mold for 3D deep drawing membrane according to claim 3 or 4, characterized in that: A positioning groove is formed on the side of the pre-bent portion (23) away from the diaphragm (7), and a positioning protrusion (32) is axially extended from the floating plate (3) toward the positioning groove. The positioning protrusion (32) cooperates with the positioning groove to limit and locate the position of the carrier plate (2) on the floating plate (3).

6. The mold for 3D deep drawing membrane according to claim 1, characterized in that: An air inlet hole (11) is provided on the upper template (1), and the upper template (1) is covered on the carrier plate (2). When the molds are closed, a sealed chamber is formed between the upper template (1) and the carrier plate (2), and the air inlet hole (11) is connected to the sealed chamber.

7. A mold for 3D deep drawing membrane according to claim 6, characterized in that: A sealing ring (12) is provided between the upper mold plate (1) and the carrier plate (2), and the sealing ring (12) is used to seal the cavity when the mold is closed.

8. The mold for 3D deep drawing membrane according to claim 1, characterized in that: A temperature sensor (51) is vertically arranged on the lower mold plate (5); the temperature sensor (51) passes through the heating fixing block and contacts the mold core (6) to monitor the temperature of the mold core (6).

9. The mold for 3D deep drawing membrane according to claim 1, characterized in that: The lower template (5) is provided with an assembly groove, and the flexible heating fixing plate (4) is installed in the assembly groove.

10. A mold for 3D deep drawing membrane according to claim 1 or 9, characterized in that: A side insulation plate (43) is provided on the side periphery of the flexible heating fixing plate (4), and a bottom insulation plate is provided on the bottom surface of the flexible heating fixing plate (4).

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