Double-cavity hot press forming die for arc-shaped silica gel piece

Abstract

The utility model discloses an arc-shaped silica gel piece double-cavity hot press forming die which comprises an upper die, a middle die and a lower die, a first cavity capable of forming an arc-shaped silica gel piece in a matched mode is formed when the upper die and the middle die are closed, and a second cavity capable of forming an arc-shaped silica gel piece in a matched mode is formed when the middle die and the lower die are closed. By forming the molding cavities between the upper mold and the middle mold and between the middle mold and the lower mold, two groups of silica gel sheet raw materials can be hot-pressed and molded into arc-shaped silica gel pieces through single mold closing, and two arc-shaped silica gel pieces can be produced within the same time, so that the production efficiency is doubled, the mold manufacturing cost and the occupied space are reduced, and the production efficiency is improved. Meanwhile, the operation process is simplified, the frequency of mold closing, mold opening and piece taking is reduced, the cost of a single arc-shaped silica gel piece is reduced, energy conservation and environmental protection are really achieved, the cost expenditure of equipment, manpower and factories is reduced in the state of capacity saturation, operation is convenient, labor and time are saved, reliability is high, product consistency is good, practicability is high, and application and popularization are easy.

Description

Technical Field

[0001] This utility model belongs to the field of hot pressing mold technology, and relates to a silicone molding mold, specifically a double-cavity hot pressing molding mold for arc-shaped silicone parts. Background Technology

[0002] Curved silicone parts are silicone products with a certain bending angle. They are widely used in various products that require curved surface sealing, cushioning, or decoration, such as wristbands for smart wearable devices, sealing strips for automotive interiors, cushioning pads for buttons in home appliances, and flexible contact parts for medical devices.

[0003] Currently, curved silicone parts are mainly manufactured using thermoforming technology. Thermoforming is a common process in silicone product manufacturing. By heating the silicone sheet material placed in a molding die consisting of a concave mold and a convex mold, and then pressing the silicone sheet material with the concave mold and the convex mold to deform it along the bottom surface of the cavity of the concave mold, a curved silicone part that meets the design requirements is formed.

[0004] In existing thermoforming technologies, the molding die is generally a two-plate die, consisting of a punch and a die. Only one part can be produced per mold closing cycle, resulting in low production efficiency and high production costs for individual curved silicone parts. To meet the growing market demand, two or more independent molds are typically used in parallel operation. However, this significantly increases mold manufacturing costs and equipment space requirements, makes the operation cumbersome, increases labor and time costs, and makes product consistency control difficult. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model proposes a dual-cavity hot-press molding die for arc-shaped silicone parts, which can simultaneously hot-press two sets of silicone sheet raw materials into arc-shaped silicone parts, thereby doubling the production efficiency.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A dual-cavity thermoforming mold for arc-shaped silicone parts includes an upper mold, a middle mold, and a lower mold. The bottom surface of the upper mold is adapted to the top surface of the middle mold to form a first cavity that can thermoform silicone sheet material into an arc-shaped silicone part when the upper mold and the middle mold are closed. The bottom surface of the middle mold is adapted to the top surface of the lower mold to form a second cavity that can thermoform silicone sheet material into an arc-shaped silicone part when the middle mold and the lower mold are closed.

[0008] Furthermore, the bottom surface of the upper mold has a first protrusion, and the first protrusion has a first molding surface adapted to the concave surface of the arc-shaped silicone part. The top surface of the middle mold has a first groove, and the first groove has a second molding surface adapted to the convex surface of the arc-shaped silicone part, so that when the upper mold and the middle mold are closed, a first cavity that can be adapted to mold the arc-shaped silicone part is formed between the first protrusion and the first groove.

[0009] Furthermore, the bottom and top surfaces of the middle mold have the same structure and are symmetrically arranged. The bottom surface of the middle mold is adapted to the convex surface of the arc-shaped silicone part. The lower mold is arranged opposite to the upper mold and has the same structure. The top surface of the lower mold is adapted to the concave surface of the arc-shaped silicone part. When the middle mold and the lower mold are closed, a second cavity is formed that can be adapted to form the arc-shaped silicone part.

[0010] Furthermore, an upper hot press plate is provided on one side of the top surface of the upper mold, and a lower hot press plate is provided on one side of the bottom surface of the lower mold.

[0011] Furthermore, the top surface of the upper mold and the bottom surface of the lower mold are each provided with two venting grooves. The two venting grooves on the upper mold are symmetrically distributed and do not communicate with the first cavity, and the two venting grooves on the lower mold are symmetrically distributed and do not communicate with the second cavity.

[0012] Furthermore, the bottom surface of the middle mold has a second protrusion, and the second protrusion has a third molding surface that matches the concave surface of the arc-shaped silicone part. The top surface of the lower mold has a second groove, and the second groove has a fourth molding surface that matches the convex surface of the arc-shaped silicone part, so that when the middle mold and the lower mold are closed, a second cavity that can be molded into the arc-shaped silicone part is formed between the second protrusion and the second groove.

[0013] Furthermore, an upper hot press plate is provided on one side of the top surface of the upper mold, and multiple interconnected air grooves are opened on the bottom surface of the lower mold, with an air extraction hole opened on any one of the air grooves. An air extraction device is provided on one side of the bottom surface of the lower mold, and a sealed space is formed between the bottom surface of the lower mold and the top surface of the air extraction device. The air extraction device is connected to the air extraction hole.

[0014] Furthermore, the air grooves are elongated and distributed along the length and width of the bottom surface of the lower mold, and the air grooves are connected to the second groove.

[0015] Furthermore, a heating plate is fixedly installed in the middle of the mold, and the heating plate is located between the first groove and the second protrusion.

[0016] Furthermore, heat-conducting rods are fixedly connected to both ends of the heating plate, and through holes adapted to the heat-conducting rods are opened at both ends of the upper mold. Insertion holes adapted to the heat-conducting rods are provided on the upper hot press plate. The heat-conducting rods pass through the through holes and slide to connect with the upper mold. The heat-conducting rods are inserted into the insertion holes and fixedly connected with the upper hot press plate.

[0017] The beneficial effects of this utility model are as follows: The dual-cavity thermoforming mold for arc-shaped silicone parts provided by this utility model includes an upper mold, a middle mold, and a lower mold. When the upper mold and the middle mold are closed, a first cavity is formed that can be adapted to form an arc-shaped silicone part. When the middle mold and the lower mold are closed, a second cavity is formed that can be adapted to form an arc-shaped silicone part. By forming molding cavities between the upper mold and the middle mold, as well as between the middle mold and the lower mold, two sets of silicone sheet raw materials can be thermoformed into arc-shaped silicone parts in a single mold closing. Two arc-shaped silicone parts can be produced in the same time, which doubles the production efficiency, reduces the mold manufacturing cost and space occupation, simplifies the operation process, reduces the frequency of mold closing, mold opening, and part removal, and reduces the cost of a single arc-shaped silicone part. It truly achieves energy saving and environmental protection, reduces the cost of equipment, labor, and factory space under saturated production capacity, is easy to operate, saves labor and time, has high reliability, good product consistency, strong practicality, and is easy to promote and apply. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the split structure of one embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the upper mold in one embodiment of the present invention.

[0020] Figure 3 This is a schematic diagram of the structure of the middle mold in one embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the working state of one embodiment of the present invention.

[0022] Figure 5 This is a schematic diagram of the split structure of another embodiment of the present invention.

[0023] Figure 6 This is a schematic diagram of the upper mold in another embodiment of the present invention.

[0024] Figure 7 This is a schematic diagram of the structure of the middle mold in another embodiment of the present invention.

[0025] Figure 8 This is a schematic diagram of the lower mold in another embodiment of the present invention.

[0026] Figure 9 This is a schematic diagram of the working state of another embodiment of the present invention.

[0027] Figure 10 This is a bottom view of the lower mold in another embodiment of the present invention. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0029] like Figure 1 As shown, this utility model provides a dual-cavity thermoforming mold for arc-shaped silicone parts, including an upper mold 1, a middle mold 2, and a lower mold 3. The bottom surface of the upper mold 1 is adapted to the top surface of the middle mold 2 to form a first cavity 5 when the upper mold 1 and the middle mold 2 are closed, which can thermoform the silicone sheet material 41 into an arc-shaped silicone part 42. The bottom surface of the middle mold 2 is adapted to the top surface of the lower mold 3 to form a second cavity 6 when the middle mold 2 and the lower mold 3 are closed, which can thermoform the silicone sheet material 41 into an arc-shaped silicone part 42. By forming molding cavities between the upper mold 1 and the middle mold 2 and between the middle mold 2 and the lower mold 3, two sets of silicone sheet materials 41 can be thermoformed into arc-shaped silicone parts 42 simultaneously in the same time, thereby doubling the production efficiency. Compared with the existing two-set thermoforming molds, it has lower cost, is easier to operate, saves labor and time, has higher reliability, good practicality, and is easy to promote and apply.

[0030] like Figures 2-3 As shown, the bottom surface of the upper mold 1 has a first protrusion 11, and the first protrusion 11 has a first molding surface 12 that matches the concave surface of the arc-shaped silicone part 42. The top surface of the middle mold 2 has a first groove 21, and the first groove 21 has a second molding surface 22 that matches the convex surface of the arc-shaped silicone part 42, so that when the upper mold 1 and the middle mold 2 are closed, a first cavity 5 that can be molded to fit the arc-shaped silicone part 42 is formed between the first protrusion 11 and the first groove 21. The bottom surface and the top surface of the middle mold 2 have the same structure and are symmetrically arranged. The bottom surface of the middle mold 2 matches the convex surface of the arc-shaped silicone part 42. The lower mold 3 is arranged opposite to the upper mold 1 and has the same structure. The top surface of the lower mold 3 matches the concave surface of the arc-shaped silicone part 42, and a second cavity 6 that can be molded to fit the arc-shaped silicone part 42 is formed when the middle mold 2 and the lower mold 3 are closed.

[0031] like Figure 4As shown, an upper hot press plate 7 is provided on one side of the top surface of the upper mold 1. The upper hot press plate 7 drives the upper mold 1 to close towards the middle mold 2 to hot press the silicone sheet material 41 into an arc-shaped silicone part 42 in the first cavity 5. A lower hot press plate 8 is provided on one side of the bottom surface of the lower mold 3. The lower hot press plate 8 drives the lower mold 3 to close towards the middle mold 2 to hot press the silicone sheet material 41 into an arc-shaped silicone part 42 in the second cavity 6. Two venting grooves 13 are provided on the top surface of the upper mold 1 and the bottom surface of the lower mold 3. The two venting grooves 13 on the upper mold 1 are symmetrically distributed and do not communicate with the first cavity 5. The two venting grooves 13 on the lower mold 3 are symmetrically distributed and do not communicate with the second cavity 6. This is so that during the hot pressing process of the arc-shaped silicone part, when the upper hot press plate 7 and the lower hot press plate 8 hot press the upper mold 1 and the lower mold 3 respectively, the venting grooves 13 can avoid the formation of a vacuum, protect the mold from displacement, and thus achieve smooth separation of the mold and the hot press plate.

[0032] As another embodiment of this application, such as Figures 5-8 As shown, the bottom surface of the middle mold 2 has a second protrusion 23, and the second protrusion 23 has a third molding surface 24 that is adapted to the concave surface of the arc-shaped silicone part 42. The top surface of the lower mold 3 has a second groove 31, and the second groove 31 has a fourth molding surface 32 that is adapted to the convex surface of the arc-shaped silicone part 42, so that when the middle mold 2 and the lower mold 3 are closed, a second cavity 6 that can be adapted to form the arc-shaped silicone part 42 is formed between the second protrusion 23 and the second groove 31.

[0033] like Figures 9-10 As shown, an upper hot press plate 7 is provided on one side of the top surface of the upper mold 1. The upper hot press plate 7 drives the upper mold 1 to close the middle mold 2 to hot press the silicone sheet material 41 into an arc-shaped silicone part 42 in the first cavity 5. The bottom surface of the lower mold 3 has multiple interconnected air grooves 33, and an air extraction hole 34 for filling and releasing air is provided on any one of the air grooves 33. An air extraction device 9 is provided on one side of the bottom surface of the lower mold 3. A sealed space is formed between the bottom surface of the lower mold 3 and the top surface of the air extraction device 9. The air extraction device 9 is connected to the air extraction hole 34. The air grooves 33 are elongated and distributed along the length and width of the bottom surface of the lower mold 3. The air grooves 33 are connected to the second groove 31 through micropores densely distributed in the lower mold 3. Thus, the air extraction device 9 can tightly adsorb the silicone sheet material 41 placed in the second groove 31 onto the bottom surface of the second groove 31 through the air extraction hole 34 and the air grooves 33.

[0034] A heating plate 25 is fixedly installed in the middle of the middle mold 2. The heating plate 25 is located between the first groove 21 and the second protrusion 23 to heat the silicone film material 41 in the upper first groove 21 and the lower second protrusion 23, respectively. Heat-conducting rods 26 are fixedly connected to both ends of the heating plate 25. Through holes 14 adapted to the heat-conducting rods 26 are opened at both ends of the upper mold 1. Insertion holes adapted to the heat-conducting rods 26 are provided on the upper hot press plate 7. The heat-conducting rods 26 pass through the through holes 14 and are slidably connected to the upper mold 1. The heat-conducting rods 26 are inserted into the insertion holes and fixedly connected to the upper hot press plate 7. The heat on the upper hot press plate 7 is transferred to the heating plate 25 through the heat-conducting rods 26. During the mold closing process of the middle mold 2 and the lower mold 3, the silicone sheet material 41 is placed in the second groove 31 of the lower mold 3. The second protrusion 23, heated by the heating plate 25, contacts the silicone sheet material 41 in the second groove 31 and heats the silicone sheet material 41. During the heating process, the silicone sheet material 41 slowly softens. The air extraction device 9 can tightly adsorb the softened silicone sheet material 41 onto the bottom surface of the second groove 31 through the air extraction hole 34 and the air groove 33. Due to the existence of the heat absorption force, the silicone sheet material 41 in the second groove 31 can easily form an arc-shaped silicone part 42 that conforms to the design structure according to the shape of the bottom surface of the second groove 31.

[0035] The silicone sheet material 41 inside the second groove 31 adheres tightly to the bottom surface of the second groove 31 under the action of thermal absorption, that is, it is distributed along the shape of the bottom surface of the second groove 31. Therefore, the silicone sheet material 41 inside the second groove 31 can form an arc-shaped silicone part 42 that meets the design structural requirements without applying pressure to the second protrusion 23 or with very little pressure. This reduces the pressure force between the middle mold 2 and the lower mold 3, thereby reducing mold marks on the surface of the arc-shaped silicone part 42 and improving its appearance. At the same time, the mold is subjected to less pressure, so it will not deform or be damaged, thus extending the service life of the mold. In addition, after the silicone sheet material 41 forms the arc-shaped silicone part 42 through thermal absorption, during the cooling process, air can be quickly filled into the gap between the middle mold 2 and the lower mold 3 through the air extraction hole 34 and the air groove 33, making it easy to remove the formed arc-shaped silicone part 42 from the mold.

[0036] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A dual-cavity thermoforming mold for arc-shaped silicone parts, characterized in that, The mold includes an upper mold (1), a middle mold (2) and a lower mold (3). The bottom surface of the upper mold (1) is adapted to the top surface of the middle mold (2) to form a first cavity (5) that can heat-press the silicone sheet material (41) into an arc-shaped silicone part (42) when the upper mold (1) and the middle mold (2) are closed. The bottom surface of the middle mold (2) is adapted to the top surface of the lower mold (3) to form a second cavity (6) that can heat-press the silicone sheet material (41) into an arc-shaped silicone part (42) when the middle mold (2) and the lower mold (3) are closed.

2. The molding die according to claim 1, characterized in that, The bottom surface of the upper mold (1) has a first protrusion (11), and the first protrusion (11) has a first molding surface (12) that is adapted to the concave surface of the arc-shaped silicone part (42). The top surface of the middle mold (2) has a first groove (21), and the first groove (21) has a second molding surface (22) that is adapted to the convex surface of the arc-shaped silicone part (42), so that when the upper mold (1) and the middle mold (2) are closed, a first cavity (5) that can be adapted to mold the arc-shaped silicone part (42) is formed between the first protrusion (11) and the first groove (21).

3. The molding die according to claim 2, characterized in that, The bottom and top surfaces of the middle mold (2) have the same structure and are symmetrically arranged. The bottom surface of the middle mold (2) is adapted to the convex surface of the arc-shaped silicone part (42). The lower mold (3) is arranged opposite to the upper mold (1) and has the same structure. The top surface of the lower mold (3) is adapted to the concave surface of the arc-shaped silicone part (42). When the middle mold (2) and the lower mold (3) are closed, a second cavity (6) is formed that can be adapted to form the arc-shaped silicone part (42).

4. The molding die according to claim 3, characterized in that, The upper mold (1) has an upper hot platen (7) on one side of its top surface, and the lower mold (3) has a lower hot platen (8) on one side of its bottom surface.

5. The molding die according to claim 4, characterized in that, The top surface of the upper mold (1) and the bottom surface of the lower mold (3) are provided with two venting grooves (13). The two venting grooves (13) on the upper mold (1) are symmetrically distributed and do not communicate with the first cavity (5). The two venting grooves (13) on the lower mold (3) are symmetrically distributed and do not communicate with the second cavity (6).

6. The molding die according to claim 2, characterized in that, The bottom surface of the middle mold (2) has a second protrusion (23), and the second protrusion (23) has a third molding surface (24) that is adapted to the concave surface of the arc-shaped silicone part (42). The top surface of the lower mold (3) has a second groove (31), and the second groove (31) has a fourth molding surface (32) that is adapted to the convex surface of the arc-shaped silicone part (42), so that when the middle mold (2) and the lower mold (3) are closed, a second cavity (6) that can be adapted to form the arc-shaped silicone part (42) is formed between the second protrusion (23) and the second groove (31).

7. The molding die according to claim 6, characterized in that, The upper mold (1) has an upper hot platen (7) on one side of its top surface. The lower mold (3) has multiple interconnected air grooves (33) on its bottom surface, and an air extraction hole (34) is provided on any one of the air grooves (33). An air extraction device (9) is provided on one side of the bottom surface of the lower mold (3). A sealed space is formed between the bottom surface of the lower mold (3) and the top surface of the air extraction device (9). The air extraction device (9) is connected to the air extraction hole (34).

8. The molding die according to claim 7, characterized in that, The air groove (33) is long and narrow, distributed along the length and width of the bottom surface of the lower mold (3), and the air groove (33) is connected to the second groove (31).

9. The molding die according to claim 8, characterized in that, A heating plate (25) is fixedly installed in the middle of the middle mold (2), and the heating plate (25) is located between the first groove (21) and the second protrusion (23).

10. The molding die according to claim 9, characterized in that, The heating plate (25) is fixedly connected to both ends with heat-conducting rods (26). The upper mold (1) has through holes (14) at both ends that are compatible with the heat-conducting rods (26). The upper hot plate (7) has insertion holes that are compatible with the heat-conducting rods (26). The heat-conducting rods (26) pass through the through holes (14) and are slidably connected to the upper mold (1). The heat-conducting rods (26) are inserted into the insertion holes and are fixedly connected to the upper hot plate (7).

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