Single-die secondary thermal forming die

Abstract

The utility model relates to a single-die secondary thermal forming die. The technical problem that an existing thermal forming die is unreasonable in design is solved. The single-mold secondary thermal forming mold comprises a lower mold base and a lower mold base, wherein a concave mold cavity is formed in the middle of the upper end of the lower mold base; the positioning assembly comprises mounting blocks which are arranged on the lower die base at intervals and located on the circumferential edge of the die cavity, and limiting convex parts which elastically protrude and extend to the upper portion of the die cavity are arranged on the sides, close to the die cavity, of the mounting blocks in a penetrating mode; the upper die base is vertically arranged above the lower die base in a lifting mode, a movable die block and a pressure applying driver are arranged in the upper die base in a penetrating mode, the end of the movable die block can protrude out of the bottom of the upper die base, the pressure applying driver is arranged in the upper die base and connected with the movable die block, and a gap exists between the movable die block and the inner wall of the die cavity; and the end part of the upper die holder is provided with a forming convex part which is embedded into a gap between the inside of the die cavity and the movable die block. According to the single-mold secondary thermal forming mold, the heat loss of a product is reduced, and the thermal forming effect is improved by adopting a single-mold double-acting mode.

Description

Technical Field

[0001] This utility model belongs to the field of thermoforming molds and relates to a single-mold secondary thermoforming mold. Background Technology

[0002] For example, Chinese patent literature discloses a thermoforming mold for a lightweight automotive side panel reinforcement plate [202210561059.2], which includes a base plate, a mounting bracket located at the upper end of the base plate, a lower mold located at the upper end of the base plate and having a cavity, a stamping groove located at the upper end of the lower mold, an upper mold located above the lower mold, a stamping part located at the upper end of the mounting bracket and used to drive the upper mold to move up and down, and also includes an electric heating wire located in the cavity, two temperature control devices located in the cavity and used for demolding the formed automotive side panel reinforcement plate, a temperature control device located in the cavity and used to control the preheating operation of the electric heating wire and unlock the demolding component, an air inlet pipe located at the side end of the lower mold and communicating with the inside of the cavity, and a cooling component located at the other side end of the lower mold and used to cool the stamping groove.

[0003] The drawback of the above technical solution is that after the material is formed for the first time, the temperature of the product has dropped and cannot meet the deformation temperature required for the second forming. The product formed for the first time must be heated for the second time and then transferred to the second mold for the second forming. Because the traditional process requires multiple molds, multiple sets of equipment, multiple heating and product transfer, the investment in molds and equipment is large, the heating cost is high, the labor cost is high, and the production efficiency and capacity are low. Utility Model Content

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by providing a single-mold secondary thermoforming mold.

[0005] The objective of this utility model can be achieved through the following technical solutions:

[0006] The single-mold secondary thermoforming mold includes:

[0007] The lower mold base has a recessed mold cavity in the middle of its upper end;

[0008] The positioning component includes mounting blocks spaced apart on the lower mold base and located at the circumferential edge of the mold cavity, wherein the mounting blocks are provided with a limiting protrusion that is elastically protruding and extends above the mold cavity on the side near the mold cavity;

[0009] An upper mold base is vertically and vertically positioned above the lower mold base. A moving module with its end protruding beyond the bottom of the upper mold base is inserted through the middle of the upper mold base, and a pressure driver is disposed in the upper mold base and connected to the moving module. There is a gap between the moving module and the inner wall of the mold cavity. The end of the upper mold base is provided with a forming protrusion that fits and is embedded in the gap between the moving module and the mold cavity. The forming protrusion, the moving module, and the lower mold base form a closed forming cavity.

[0010] Furthermore, the lower mold base includes a sleeve base, in which a forming mold core is detachably connected, and the inner wall of the sleeve base and the forming mold core form a mold cavity.

[0011] Furthermore, the mounting blocks are arranged in a circular pattern along the circumferential edge of the mold cavity, and the end face of the mounting blocks is flush with the end face of the inner wall of the mold cavity.

[0012] Furthermore, the limiting protrusion has an abutment surface on the side away from the mounting block, and the abutment surface is either a conical surface or an arc-shaped surface.

[0013] Furthermore, the mounting block is provided with a blind mounting hole, and a connecting spring connecting the mounting block and the limiting protrusion is provided in the blind mounting hole.

[0014] Furthermore, the bottom of the upper mold base is provided with a molding block that can close with the lower mold base, and the molding protrusion is provided on the molding block.

[0015] Furthermore, the molding block is provided with a clearance notch for the mounting block to be inserted.

[0016] Furthermore, the moving module is connected to the upper mold base via a guide sleeve of equal height.

[0017] Furthermore, the upper end of the mounting block has a guide radius on the side near the mold cavity.

[0018] Furthermore, the lower mold base is provided with an ejector structure that can extend into the bottom of the mold cavity.

[0019] Compared with existing technologies, this single-mold secondary thermoforming mold keeps the heated high-temperature product positioned on the limiting protrusion before forming. At the same time, when the product is subjected to external forces from above and below, it can smoothly pass through the limiting protrusion, reducing heat loss. Moreover, the single-mold double-action method keeps the thermoformed product at a certain high temperature, resulting in good material fluidity. This greatly reduces the pressure required for product forming, makes it easier to form some complex and intricate structures, and improves the thermoforming effect. Attached Figure Description

[0020] Figure 1 A schematic diagram of a single-mold secondary thermoforming mold provided by this utility model.

[0021] Figure 2 for Figure 1 A schematic diagram of the cross-section of a single-mold secondary thermoforming die.

[0022] Figure 3 for Figure 1 A schematic diagram of the single-mold secondary thermoforming mold with one-time molding capability.

[0023] Figure 4 for Figure 1 A schematic diagram of the secondary forming process of a single-mold secondary thermoforming mold.

[0024] Figure 5 for Figure 1 A schematic diagram of the ejection structure of a single-mold secondary thermoforming mold.

[0025] In the diagram, 10 is the lower mold base; 11 is the sleeve base; 12 is the forming mold core; 13 is the mold cavity; 20 is the positioning component; 21 is the mounting block; 22 is the limiting protrusion; 23 is the abutment surface; 24 is the mounting blind hole; 25 is the connecting spring; 26 is the guide fillet; 30 is the upper mold base; 31 is the moving module; 32 is the pressure driver; 33 is the forming block; 34 is the forming protrusion; 35 is the forming cavity; 36 is the clearance notch; 37 is the equal height guide sleeve; and 40 is the ejection structure. Detailed Implementation

[0026] Example 1

[0027] Please see Figures 1 to 3 This is a schematic diagram of a single-mold secondary thermoforming mold provided by this utility model. The single-mold secondary thermoforming mold includes: a lower mold base 10, a positioning component 20 disposed on the lower mold base 10, and an upper mold base 30 disposed above the lower mold base 10. It is conceivable that this single-mold secondary thermoforming mold also includes other functional components and specific structures, such as electrical connection components, control components, cooling pipe mechanisms, and installation structures, all of which are well known in the technical field and will not be described in detail here.

[0028] The frame serves as the mounting carrier for all components. In this embodiment, both the lower mold base 10 and the upper mold base 30 are mounted on the frame. The lower mold base 10 is a fixed mold base, and the upper mold base 30 is a sliding mold base that maintains accurate guidance with the frame through guide rails. The frame is also equipped with a mold closing cylinder that can drive the upper mold base 30 to close towards the lower mold base 10. The frame and the mold closing cylinder are existing technologies in the field and will not be described in detail here.

[0029] In this embodiment, the lower mold base 10 includes a sleeve base 11, which serves as a base. A forming mold core 12 is detachably connected to the sleeve base 11. The forming mold core 12 is connected to the sleeve base 11 by a threaded fastening method, and a recessed mold cavity 13 is formed between the inner wall of the sleeve base 11 and the forming mold core 12. The upper end shape of the forming mold core 12 is the bottom structure of the forming cavity 35.

[0030] In this embodiment, the positioning component 20 includes mounting blocks 21 spaced apart on the lower mold base 10 and located at the circumferential edge of the mold cavity 13. A limiting protrusion 22, elastically protruding and extending above the mold cavity 13, is provided on the side of the mounting block 21 closest to the mold cavity 13. Specifically, the mounting block 21 has a blind mounting hole 24, in which a connecting spring 25 connects the mounting block 21 and the limiting protrusion 22. The connecting spring 25 is an adjustable compression spring, ensuring free extension and retraction of the limiting protrusion 22. The heated high-temperature product is positioned on the limiting protrusion 22 before molding, and can smoothly pass through the limiting protrusion 22 when subjected to external forces, with initial deformation force applied during passage. It should be noted that the outer diameter of the heated high-temperature product tends to be closer to the inner diameter of the mold cavity 13, and the peripheral edge of the product does not protrude beyond the circumferential edge of the mold cavity 13.

[0031] Mounting blocks 21 are circumferentially distributed along the circumferential edge of the mold cavity 13, and the end face of the mounting blocks 21 is flush with the end face of the inner wall of the mold cavity 13, increasing the load-bearing capacity of the product on the limiting protrusion 22. A guide radius 26 is provided on the upper end of the mounting blocks 21 near the mold cavity 13. The mounting position of the mounting blocks 21 and the guide radius 26 reduce product interference and better guide the product into the mold cavity 13. Optimally, an abutment surface 23 is provided on the side of the limiting protrusion 22 away from the mounting blocks 21. The abutment surface 23 facilitates force bearing and ensures that the limiting protrusion 22 can be completely retracted into the mounting blind hole 24. The abutment surface 23 can be either a conical surface or an arc surface; in this embodiment, the abutment surface 23 has a hemispherical arc surface structure. Depending on the shape of different products, different numbers of mounting blocks 21 can be designed. The setting height of the limiting protrusion 22 and the size of the mounting block 21 can be set according to the differences in product structure. This can ensure the accurate positioning of the product on the lower mold base 10, and ensure that the product is only in contact with air during the time from the high temperature furnace to the mold cavity 13 and during the time when the equipment is in contact with the upper mold base 30 on the upper surface of the product. The temperature of the product will not drop too quickly, thus fully guaranteeing the temperature required before the product is thermoformed.

[0032] The upper mold base 30 is positioned above the lower mold base 10 and is vertically raised and lowered via a mold-closing cylinder. A moving module 31 is inserted through the middle of the upper mold base 30, along with a pressure actuator 32 connected to the moving module 31 within the upper mold base 30. In this embodiment, the pressure actuator 32 is a nitrogen spring, and the size and number of springs can be adjusted according to the product structure requirements, thereby regulating the spring force, i.e., adjusting the pressure required for the first high-temperature deformation of the product. Correspondingly, this also adjusts the length of the moving module 31 protruding from the bottom of the upper mold base 30. The moving module 31 and the upper mold base 30 are connected by a guide sleeve 37 of equal height, which improves the displacement accuracy of the moving module 31 and ensures the flatness of the product's molding surface.

[0033] There is a gap between the moving module 31 and the inner wall of the mold cavity 13. In this embodiment, there are gaps between the moving module 31 and the inner walls on both sides of the mold cavity 13. The moving module 31 moves downward with the upper mold base 30. The bottom of the moving module 31 acts on the upper end of the product, applying pressure to the product after it passes through the limiting protrusion 22 until it reaches the bottom of the mold cavity 13. Relying on the pressure of the pressure driver 32, at high temperature, the moving module 31 continues to apply pressure to the product. When the product is in a relatively soft state, it completes a bending and forming process with a small force, forcing the excess material of the product into the aforementioned gap. The corners of the product are still relatively large, and it is an incomplete, rough blank.

[0034] A forming protrusion 34 is provided at the end of the upper mold base 30, fitting into the gap between the upper mold base 30 and the moving module 31. The forming protrusion 34, the moving module 31, and the lower mold base 10 form a closed forming cavity 35. As the lower mold base 10 moves further downward, the forming protrusion 34 presses against the product residue in the gap and begins to contact the product for secondary forging until the moment of final mold closing. At the same time, the moving module 31 remains in contact with the product and retracts with the nitrogen spring, ultimately forming a compact molded product in the forming cavity 35. By adopting a single-mold double-action method, the thermoformed product is still at a certain high temperature, resulting in good material fluidity, greatly reducing the pressure required for product forming, making it easier to form some complex and intricate structures, and improving the thermoforming effect.

[0035] The bottom of the upper mold base 30 is provided with a molding block 33 that can be molded with the lower mold base 10. The molding block 33 is fixedly connected to the bottom of the upper mold base 30. The molding block 33 is mainly used for the circumferential edge to be smoothly engaged with the lower mold base 10. A molding protrusion 34 is provided on the molding block 33. When the molding block 33 is engaged with the lower mold base 10, the molding protrusion 34 can be driven to extend into the mold cavity 13 to a certain depth. The molding block 33 is provided with a clearance notch 36 for the mounting block 21 to be inserted, so as to avoid the mounting block 21 from affecting the engagement between the molding block 33 and the lower mold base 10.

[0036] In addition, it is conceivable that the lower mold base 10 is provided with an ejector structure 40 that can extend into the bottom of the mold cavity 13. The ejector structure 40 includes an ejector cylinder, the output end of which is embedded in the bottom of the mold cavity 13. The ejector structure 40 is used to eject the molded product from the mold cavity 13.

[0037] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A single mode bi-thermoforming mold characterized in that, The utility model relates to a moulding device for injection moulding, which comprises: a lower mould base (10) with a concave mould cavity (13) in the middle of the upper end; a positioning assembly (20) comprising mounting blocks (21) arranged at intervals on the lower mould base (10) and located at the circumferential edge of the mould cavity (13), the side of the mounting blocks (21) close to the mould cavity (13) being provided with limiting protrusions (22) that protrude elastically and above the mould cavity (13); an upper mould base (30) vertically arranged above the lower mould base (10), the upper mould base (30) being provided in the middle with a movable mould block (31) with an end that can protrude from the bottom of the upper mould base (30) and a pressure applying driver (32) arranged in the middle of the upper mould base (30) and connected to the movable mould block (31), the movable mould block (31) having a gap with the inner wall of the mould cavity (13), the end of the upper mould base (30) being provided with a forming protrusion (34) that fits into the gap between the movable mould block (31) and the inner wall of the mould cavity (13), the forming protrusion (34) and the movable mould block (31) and the lower mould base (10) forming a closed forming cavity (35).

2. The single mode bi-thermoforming mold of claim 1, wherein, The lower mould base (10) comprises a sleeve base (11) that is detachably connected with a forming mould core (12), the inner wall of the sleeve base (11) and the forming mould core (12) forming the mould cavity (13).

3. The single mode bi-thermoforming mold of claim 1, wherein, The mounting blocks (21) are arranged at intervals at the circumferential edge of the mould cavity (13), and the end face of the mounting blocks (21) is flush with the end face of the inner wall of the mould cavity (13).

4. The single mode bi-thermoforming mold of claim 3, wherein, The side of the limiting protrusions (22) away from the mounting blocks (21) is provided with an abutting face (23) that is any one of a conical face or an arc face.

5. The single mode bi-thermoforming mold of claim 4, wherein, The mounting blocks (21) are provided with mounting blind holes (24) that are provided with connecting springs (25) connecting the mounting blocks (21) and the limiting protrusions (22).

6. The single mode bi-thermoforming mold of claim 5, wherein, The bottom of the upper mould base (30) is provided with a forming block (33) that can be closed with the lower mould base (10), and the forming protrusion (34) is arranged on the forming block (33).

7. The single mode bi-thermoforming mold of claim 6, wherein, The forming block (33) is provided with a gap (36) for the mounting blocks (21) to fit into.

8. The single mode bi-thermoforming mold of claim 1, wherein, The movable mould block (31) and the upper mould base (30) are connected through an equal-height guide sleeve (37).

9. The single mode bi-thermoforming mold of claim 1, wherein, The side of the upper end of the mounting blocks (21) close to the mould cavity (13) is provided with a guide round corner (26).

10. The single mode bi-thermoforming mold of claim 1, wherein, The lower mould base (10) is provided with an ejection structure (40) that can extend into the bottom of the mould cavity (13).

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