A hair clip secondary hot press forming die

Abstract

The utility model discloses a hairpin secondary hot press forming die, through twice hot press forming process, three hairpin bending pieces are sequentially pressure bonded as integral hairpin, and the hairpin secondary hot press forming die includes the lower die plate with lower installation groove, the core embedded in the lower installation groove and the upper die plate cover in the top surface of lower die plate, the upper die plate bottom surface is provided with the upper installation groove for the core embedding, the lower installation groove both sides wall forms respectively the first inclined plane that extends obliquely upwards, and the first inclined plane is provided with a plurality of material placing grooves, the core top surface both sides are provided with respectively the second inclined plane that extends to the oblique lower side, the second inclined plane is provided with the material placing groove, and the material placing groove bottom wall is provided with the clamping cavity that penetrates to the core side surface. The utility model can make the clamping side surface of two hairpin bending pieces of integral hairpin of secondary hot press forming closely adhere, can guarantee two hairpin bending pieces after opening repeatedly still can keep the state of close adhesion, thereby improves the service life of integral hairpin.

Description

Technical Field

[0001] This utility model relates to the field of hair clip production technology, specifically a hair clip secondary hot pressing molding die. Background Technology

[0002] A hair clip typically consists of two curved clips for holding hair, each clip being connected to a snap fastener with a hole. The two snap fasteners are connected by a torsion spring and a pin. Therefore, the manufacturing process generally includes hot-pressing the clips (hot-pressing a flat sheet into a curved shape), attaching the snap fasteners to the clips, and assembling the hair clip.

[0003] The aforementioned hair clip production process involves numerous steps and manual assembly, making mass production difficult and resulting in low efficiency. Therefore, in recent years, to reduce production costs, the hair clip structure has been simplified, omitting components such as torsion springs and pins. Instead, the elasticity of the clip's curved plates is used to hold the hair, creating a one-piece structure, such as... Figure 1 As shown, this existing one-piece hair clip 7 includes three sequentially connected hair clip bends 71; two of the hair clip bends 71 ​​are used to hold hair, and the third hair clip bend 71 is used to elastically open the two hair clip bends 71. Its structure is simple and easy to use. Existing methods for producing such one-piece hair clips typically involve one-time injection molding, enabling efficient mass production. However, in one-piece hair clips molded by injection molding, the clamping surfaces of the two hair clip bends cannot directly contact each other during injection molding; otherwise, they would become one piece and unable to open. This results in a gap between the clamping surfaces of the two hair clip bends after molding, preventing them from fitting tightly together. Furthermore, this gap increases with frequent use of the one-piece hair clip, leading to a decrease in its hair-holding effectiveness and significantly shortening its lifespan. Utility Model Content

[0004] The purpose of this utility model is to provide a secondary hot-press forming mold for hair clips, which makes the clamping sides of the two hair clip bends after secondary hot pressing fit tightly together, and one end of the clamping side of the two hair clip bends after fitting undergoes a certain elastic deformation, which can ensure that the two hair clip bends can maintain a fitting state after being opened and closed multiple times, thereby improving the service life of the one-piece hair clip and solving the problem mentioned in the background art that the bends of the existing one-piece molded hair clips have gaps, resulting in a shorter service life.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A secondary hot-press forming mold for hair clips, through two hot-press forming processes, sequentially presses three hair clip bends into an integral hair clip. The secondary hot-press forming mold for hair clips includes a lower template with a lower mounting groove, a core embedded in the lower mounting groove, and an upper template covering the top surface of the lower template. The bottom surface of the upper template has an upper mounting groove for the core to be embedded. The two side walls of the lower mounting groove are respectively formed into first inclined surfaces extending upwards, and the first inclined surfaces have a plurality of material placement grooves. The top surface of the core has second inclined surfaces extending downwards on both sides, and the second inclined surfaces have material release grooves. The bottom wall of the material release groove has a clamping cavity that extends through to the side of the core.

[0007] Preferably, the second inclined surface and the first inclined surface cooperate to form a V-shaped groove structure, and V-shaped protrusions that protrude downward and are adapted to the V-shaped groove structure are formed on both sides of the upper mounting groove.

[0008] Preferably, the V-shaped protrusion has several limiting grooves along its length that are adapted to the material chute and the material discharge chute, and the several limiting grooves are arranged in a straight line at equal intervals on the V-shaped protrusion.

[0009] Preferably, a clamping part extending obliquely upward is formed at the connection between the second inclined surface and the side of the core, and the V-shaped protrusion has a groove adapted to the clamping part along its length direction.

[0010] Preferably, the top of the clamping part has several clamping grooves along the length direction of the core.

[0011] Preferably, the bottom wall of the feeding trough has a lower groove that extends through the clamping cavity, and a first positioning post is embedded in the lower groove. The V-shaped protrusion has an upper groove that is vertically opposite to the lower groove, and the top of the first positioning post is inserted into the upper groove.

[0012] Preferably, the side wall of the first positioning post is provided with a slot for the hair clip bend to be inserted.

[0013] Preferably, the bottom wall of the lower mounting groove is provided with a recessed receiving groove, and the bottom surface of the core is formed with a downwardly protruding limiting part, which is embedded in the receiving groove.

[0014] Preferably, a second positioning post is vertically provided on the bottom wall of the receiving groove, and a first slot is provided on the bottom wall of the limiting part for the second positioning post to be inserted.

[0015] Preferably, a third positioning post is erected at each of the four corners of the top surface of the lower template, and a second slot for inserting the corresponding third positioning post is provided at each of the four corners of the bottom surface of the upper template.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: In the integrated hair clip formed by the above-mentioned secondary hot pressing, the clamping sides of the two hair clip bends are tightly fitted together, and another hair clip bend connected to them is used to elastically open them; after the two hair clip bends are fitted together, one end of the clamping side undergoes a certain elastic deformation, which can ensure that the two hair clip bends can still maintain a fitted state after being opened and closed multiple times, thereby improving the service life of the integrated hair clip. Attached Figure Description

[0017] Figure 1 A schematic diagram of the structure of an existing integrated hair clip;

[0018] Figure 2 This is a perspective view of a secondary hot-pressing molding die for hair clips according to this utility model;

[0019] Figure 3 This is an exploded view of a secondary hot-pressing molding die for hair clips according to this utility model;

[0020] Figure 4 This is a perspective view of the template of this utility model;

[0021] Figure 5 This is an exploded view of the lower template and the core of this utility model;

[0022] Figure 6 This is an exploded view of the lower template and core of this utility model from another perspective;

[0023] Figure 7 This is a perspective view of the first positioning post of this utility model;

[0024] Figure 8 This is a schematic diagram of the first hot pressing process of this utility model;

[0025] Figure 9 This is a schematic diagram of the herringbone clip formed by the first hot pressing of this utility model;

[0026] Figure 10 This is a schematic diagram of the second hot pressing process of this utility model;

[0027] Figure 11 This is a schematic diagram of the structure of the one-piece hair clip formed by the second hot pressing of this utility model.

[0028] Explanation of reference numerals in the attached drawings: 1. Lower template; 11. Lower mounting groove; 12. First inclined surface; 13. Material placement groove; 14. Receiving groove; 2. Core; 21. Second inclined surface; 22. Material release groove; 23. Clamping cavity; 24. Clamping part; 25. Clamping groove; 26. Lower embedding groove; 27. Limiting part; 3. Upper template; 31. Upper mounting groove; 32. V-shaped protrusion; 33. Limiting groove; 34. Groove; 35. Upper embedding groove; 4. First positioning post; 41. Slot; 5. Second positioning post; 6. Third positioning post; 7. Integrated hair clip; 71. Hair clip bend; 72. Herringbone clip. Detailed Implementation

[0029] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Please see Figure 1-3 A secondary hot-press forming mold for hair clips is disclosed, which sequentially presses three hair clip bends 71 ​​into a single hair clip 7 through two hot-press forming processes. The secondary hot-press forming mold includes a lower template 1 with a lower mounting groove 11, a core 2 embedded in the lower mounting groove 11, and an upper template 3 covering the top surface of the lower template 1. The bottom surface of the upper template 3 has an upper mounting groove 31 for the core 2 to be inserted. (See also...) Figure 5 The lower mounting groove 11 has two side walls that are respectively formed as first inclined surfaces 12 extending upwards. A plurality of material placement grooves 13 are provided on the first inclined surfaces 12 that are adapted to the side of the core 2. In this embodiment, the plurality of material placement grooves 13 are equally spaced along the length of the lower mounting groove 11 and are used to place the hairpin bending pieces 71. Please refer to... Figure 5-6 The top surface of the core 2 has two sides with second inclined surfaces 21 extending downwards. The second inclined surfaces 21 have several material feeding grooves 22 for placing hair clip bending pieces 71. One end of the hair clip bending piece 71 in the material feeding groove 22 overlaps with another hair clip bending piece 71 in the material feeding groove 13. The bottom wall of the material feeding groove 22 has a clamping cavity 23 that extends to the side of the core 2 for one end of the hair clip bending piece 71 to extend into.

[0031] In this embodiment, there are two of each of the lower mounting groove 11, the upper mounting groove 31, and the core 2. However, this utility model does not limit the number of the above-mentioned components, and can set them according to the actual situation. At the same time, it does not limit the number of the material placement groove 13.

[0032] Please see Figure 5 as well as Figure 8-11In this embodiment, the one-piece hair clip 7 requires two hot-pressing processes. Please refer to [link / reference]. Figure 8 During the first hot pressing, the first hairpin bend 71 is placed in the placement groove 13, then the core 2 is inserted into the lower mounting groove 11 and the second hairpin bend 71 is placed in the discharge groove 22, so that one end of the second hairpin bend 71 overlaps the first hairpin bend 71. Then the mold is closed, and a herringbone clip 72 in the shape of a "V" is obtained by hot pressing the first hairpin bend 71 and the second hairpin bend 71 together. Figure 9 As shown; finally, open the mold and remove the core 2 and herringbone clamp 72; please refer to Figure 10 Next, a second hot pressing process is performed. The third hair clip bend 71 is placed in the feeding groove 22. The core 2 is inserted, and one end of the herringbone clip 72 is inserted into the clamping cavity 23 of the core 2, while the other end is placed in the feeding groove 22 of the core 2. This allows the end of the herringbone clip 72 away from the feeding groove 22 to overlap the third hair clip bend 71. At this point, the lower end of the herringbone clip 72 in the clamping cavity 23 is tightly fitted to the lower side of the third hair clip bend 71 in the feeding groove 13. Then, the mold is closed, resulting in an integrated hair clip 7 formed by hot pressing of the herringbone clip 72 and the third hair clip bend 71. Figure 11 As shown.

[0033] The one-piece hair clip 7 formed by the above-mentioned secondary hot pressing has two hair clip bends 71 ​​with their clamping sides tightly fitted together, and another hair clip bend 71 connected to them respectively is used to elastically open them; after the two hair clip bends 71 ​​are fitted together, one end of the clamping side undergoes a certain elastic deformation, which can ensure that the two hair clip bends 71 ​​can still maintain a fitted state after being opened and closed multiple times, thereby improving the service life of the one-piece hair clip 7.

[0034] Please see Figure 3 The second inclined surface 21 and the first inclined surface 12 cooperate to form a V-groove structure. Please refer to [link / reference]. Figure 4 The upper mounting groove 31 has V-shaped protrusions 32 on both sides that protrude downwards and are adapted to the V-shaped groove structure. Each V-shaped protrusion 32 has several limiting grooves 33 along its length that are adapted to the material placement groove 13 and the material release groove 22. These limiting grooves 33 are arranged linearly at equal intervals on the V-shaped protrusions 32. The top of the hairpin bending piece 71 is accommodated within the limiting grooves 33 during hot pressing. In this embodiment, the shape of the limiting grooves 33 is the same as the shape of the hairpin bending piece 71, and it is used to limit the hairpin bending piece 71 from shifting during hot pressing.

[0035] Please see Figure 3 as well as Figure 5 A clamping portion 24 extending obliquely upwards is formed at the connection between the second inclined surface 21 and the side of the core 2. Please refer to [link / reference]. Figure 4The V-shaped protrusion 32 has a groove 34 along its length that matches the clamping part 24, and the groove 34 passes through several limiting grooves 33 in a straight line; please refer to Figure 5 The top of the clamping part 24 is provided with a plurality of clamping grooves 25 along the length direction of the core 2 for clamping the hair clip bending pieces 71. In this embodiment, the clamping grooves 25 play a positioning role for the hair clip bending pieces 71, preventing the hair clip bending pieces 71 from shifting longitudinally during the hot pressing process, so that the hair clip bending pieces 71 fit together accurately and improve the molding quality of the one-piece hair clip 7.

[0036] The clamping part 24 extends obliquely to an arc-shaped top, and the inner wall of the groove 34 is an arc-shaped surface adapted to the top of the clamping part 24. The groove 34 has a positioning function for the clamping part 24. During mold closing, the upper mold plate 3 and the lower mold plate 1 can be guided to close by the cooperation of the groove 34 and the clamping part 24.

[0037] Please see Figure 5 The bottom wall of the discharge trough 22 has a lower embedment groove 26 that extends through the side into the clamping cavity 23. A first positioning post 4 is embedded in the lower embedment groove 26. Please refer to [link to relevant documentation]. Figure 7 The first positioning post 4 has a slot 41 on its side wall for the hair clip bending piece 71 to be inserted. The slot 41 of the first positioning post 4, in conjunction with the clamping groove 25 of the clamping part 24, positions the end of the hair clip bending piece 71, preventing lateral displacement of the hair clip bending piece 71 during hot pressing. (See also...) Figure 4 In this embodiment, the V-shaped protrusion 32 has an upper groove 35 that is vertically opposite to the lower groove 26. The top of the first positioning post 4 is inserted into the upper groove 35, and the side of the upper groove 35 is connected to the limiting groove 33.

[0038] Please see Figure 5-6 The bottom wall of the lower mounting groove 11 has a recessed receiving groove 14. The bottom surface of the core 2 has a downwardly protruding limiting part 27, which is embedded in the receiving groove 14. A second positioning post 5 is vertically provided on the bottom wall of the receiving groove 14, and a first slot for inserting the second positioning post 5 is provided on the bottom wall of the limiting part 27. Through the cooperation of the second positioning post 5 and the first slot, the core 2 can be quickly and accurately installed in the lower mounting groove 11.

[0039] Please see Figure 5-6 The lower template 1 has three vertically installed third positioning posts 6 at the four corners of its top surface, and the upper template 3 has four second slots at the four corners of its bottom surface for the corresponding third positioning posts 6 to be inserted. Through the cooperation of the third positioning posts 6 and the second slots, the upper template 3 and the lower template 1 can be molded quickly and accurately.

[0040] The working principle of this utility model's secondary hot-press forming mold for hair clips is as follows: Please refer to... Figure 8During the first hot pressing, after the first hairpin bend 71 is placed in all the material placement slots 13, the core 2 is inserted into the lower mounting slot 11. Then, the second hairpin bend 71 is placed in all the material release slots 22, so that the end of the second hairpin bend 71 away from the material release slot 22 overlaps the upper side of the first hairpin bend 71. Then, the upper mold plate 3 is pressed down and fits against the lower mold plate 1 to complete the mold closing. The second hairpin bend 71 is tightly pressed onto the first hairpin bend 71, so that the first hairpin bend 71 in the material placement slot 13 and the second hairpin bend 71 in the material release slot 22 are jointly hot pressed into a herringbone clip 72, such as... Figure 9 As shown, the herringbone clamp 72 is a semi-finished product at this point; then the upper mold plate 3 moves upward to open the mold, and the core 2 and the herringbone clamp 72 are removed respectively; please refer to Figure 10 Next, a second hot pressing process is performed. The third hair clip bend 71 is then placed back into all the material slots 22. The core 2 is then inserted, with one end of the herringbone clip 72 inserted into the cavity 23 of the core 2, and the other end placed in the material slot 22 of the core 2. The end of the herringbone clip 72 furthest from the material slot 22 overlaps the upper side of the third hair clip bend 71 in the material slot 13. Then, the upper mold plate 3 is pressed down and fits against the lower mold plate 1 to complete the mold closing, so that the herringbone clip 72 and the third hair clip bend 71 in the material slot 13 are hot-pressed into an integrated hair clip 7. Figure 11 As shown, finally, the upper template 3 is opened to open the mold, and the one-piece hair clip 7 can be taken out.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A secondary hot-pressing molding die for hair clips, characterized in that: Through two hot pressing forming processes, three hair clip bending pieces (71) are pressed together in sequence to form an integrated hair clip (7). The hair clip secondary hot pressing forming mold includes a lower template (1) with a lower mounting groove (11), a core (2) embedded in the lower mounting groove (11), and an upper template (3) covering the top surface of the lower template (1). The bottom surface of the upper template (3) is provided with an upper mounting groove (31) for the core (2) to be embedded. The two side walls of the lower mounting groove (11) are respectively formed as first inclined surfaces (12) extending obliquely upward. The first inclined surfaces (12) are provided with a plurality of material placement grooves (13). The top surface of the core (2) is provided with second inclined surfaces (21) extending obliquely downward on both sides. The second inclined surfaces (21) are provided with material release grooves (22). The bottom wall of the material release groove (22) is provided with a clamping cavity (23) that penetrates to the side of the core (2).

2. The hair clip secondary hot pressing forming mold according to claim 1, characterized in that: The second inclined surface (21) and the first inclined surface (12) cooperate to form a V-shaped groove structure, and V-shaped protrusions (32) that protrude downward and are adapted to the V-shaped groove structure are formed on both sides of the upper mounting groove (31).

3. The hair clip secondary hot pressing forming mold according to claim 2, characterized in that: The V-shaped protrusion (32) has several limiting grooves (33) that are adapted to the material chute (13) and the material discharge chute (22) along its length direction. The limiting grooves (33) are arranged in a straight line at equal intervals on the V-shaped protrusion (32).

4. The hair clip secondary hot pressing forming mold according to claim 3, characterized in that: The second inclined surface (21) has a clamping part (24) extending obliquely upward at the connection with the side of the core (2), and the V-shaped protrusion (32) has a groove (34) adapted to the clamping part (24) along its length direction.

5. The hair clip secondary hot pressing forming mold according to claim 4, characterized in that: The top of the clamping part (24) has several clamping grooves (25) along the length direction of the core (2).

6. The hair clip secondary hot pressing forming mold according to any one of claims 2-5, characterized in that: The bottom wall of the feeding trough (22) is provided with a lower insert groove (26) that extends through the side into the clamping cavity (23). A first positioning post (4) is embedded in the lower insert groove (26). An upper insert groove (35) is provided on the V-shaped protrusion (32) that is vertically opposite to the lower insert groove (26). The top of the first positioning post (4) is inserted into the upper insert groove (35).

7. The hair clip secondary hot pressing forming mold according to claim 6, characterized in that: The first positioning post (4) has a slot (41) on its side wall for the hair clip (71) to be inserted.

8. The hair clip secondary hot pressing forming mold according to any one of claims 1-5, characterized in that: The bottom wall of the lower mounting groove (11) is provided with a recessed receiving groove (14), and the bottom surface of the core (2) is provided with a downward protruding limiting part (27), which is embedded in the receiving groove (14).

9. The hair clip secondary hot pressing forming mold according to claim 8, characterized in that: The bottom wall of the receiving groove (14) is provided with a second positioning post (5), and the bottom wall of the limiting part (27) is provided with a first slot for the second positioning post (5) to be inserted.

10. The hair clip secondary hot pressing forming mold according to claim 1, characterized in that: The lower template (1) has three positioning posts (6) erected at the four corners of its top surface, and the upper template (3) has two slots at the four corners of its bottom surface for the corresponding third positioning posts (6) to be inserted.

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