Injection mold for thin-walled parts

Abstract

The application relates to the technical field of injection molds, in particular to an injection mold for a thin-walled part, which comprises a ejector plate, a first ejector pin, a first insert rod and a forming mold; the plastic workpiece has an arc-shaped thin-walled part arranged vertically; the forming mold is provided with a mounting hole for the first insert rod; one end of the first ejector pin is fixed to the ejector plate, and the other end of the first ejector pin is connected with the first insert rod; the first end of the first insert rod is provided with an arc-shaped abutting surface and a guide surface, the arc-shaped abutting surface and the guide surface are oppositely arranged, and the arc-shaped abutting surface of the first insert rod is matched with the arc-shaped thin-walled part of the plastic workpiece; an inclined surface is arranged on the plastic workpiece, and the guide surface of the first insert rod is matched with the inclined surface of the plastic workpiece. In the application, the arc-shaped abutting surface and the guide surface of the first insert rod are cooperatively matched, the first insert rod and the arc-shaped thin-walled part in the plastic workpiece are conveniently demolded, the damage risk of the arc-shaped thin-walled part is reduced, and the quality of the plastic workpiece is improved.

Description

Technical Field

[0001] This application relates to the field of injection mold technology, and in particular to an injection mold for thin-walled parts. Background Technology

[0002] In order to improve production efficiency, injection molding is usually used in the production of plastic parts for automobiles.

[0003] When a plastic workpiece has a vertically curved thin-walled component, inserts are used to modify the cavity within the molding die, meaning the inserts have curved molding surfaces, to process the curved thin-walled component of the plastic workpiece. However, because the curved thin-walled component is thin, its resistance to deformation is weak. If the existing demolding method of directly moving the insert is used, forcibly separating the insert from the curved thin-walled component, the deformation of the curved thin-walled component of the plastic workpiece is relatively large, making it prone to tensile damage and affecting the quality of the plastic workpiece. Utility Model Content

[0004] To facilitate demolding of plastic workpieces with curved thin-walled components, this application provides an injection mold for thin-walled parts.

[0005] This application provides an injection mold for a thin-walled part, which adopts the following technical solution: An injection mold for a thin-walled part includes an ejector plate, a first ejector pin, a first insert, and a molding die. The molding die includes an upper mold and a lower mold, which are closed to form a receiving cavity for accommodating a plastic workpiece having a vertically arranged arc-shaped thin-walled component. The upper mold has a mounting hole for the first insert to pass through. One end of the first ejector pin is fixed to the ejector plate, and the other end of the first ejector pin is connected to the first insert. The ejector plate moves to drive the first ejector pin and the first insert. The first insert moves; the end of the first insert away from the ejector plate is the first end, and the first end of the first insert is provided with an arc-shaped abutment surface and a guide surface. The arc-shaped abutment surface and the guide surface are arranged opposite to each other. The arc-shaped abutment surface of the first insert is in contact with the arc-shaped thin-walled component of the plastic workpiece. The plastic workpiece is provided with an inclined surface, and the guide surface of the first insert is in contact with the inclined surface of the plastic workpiece. When the first insert moves toward the plastic workpiece, the inclined surface of the plastic workpiece forces the arc-shaped abutment surface to move toward the arc-shaped thin-walled component of the plastic workpiece.

[0006] By adopting the above technical solution, when the plastic workpiece needs to be demolded, the ejector plate first forces the first insert to move toward the plastic workpiece. The first insert moves along the inclined surface of the plastic workpiece, so that the arc-shaped contact surface of the first insert moves toward the arc-shaped thin-walled component of the plastic workpiece, so that the arc-shaped contact surface and the arc-shaped thin-walled component are initially separated. Subsequently, the ejector plate pulls the first insert to move away from the plastic workpiece, so that the arc-shaped contact surface of the first insert is completely separated from the arc-shaped thin-walled component of the plastic workpiece, thereby completing the demolding of the plastic workpiece. Then, the plastic workpiece is removed by a robot.

[0007] That is, through the coordinated cooperation of the arc-shaped contact surface and the guide surface on the first insert, it is easy to demold the first insert from the arc-shaped thin-walled component in the plastic workpiece, reducing the risk of damage to the arc-shaped thin-walled component, improving the quality of the plastic workpiece, and also improving production efficiency.

[0008] Optionally, it also includes a guide sleeve, which is fixed to the upper mold and has a guide hole for the first ejector pin to pass through.

[0009] By adopting the above technical solution, the position of the first ejector pin is limited by the guide hole on the guide sleeve, thereby improving the accuracy of the ejector pin movement.

[0010] Optionally, the end of the first insert near the ejector plate is the second end, and the second end of the first insert has a protruding positioning block.

[0011] By adopting the above technical solution, the positioning block plays a positioning role, thereby improving the installation stability of the first insert rod.

[0012] Optionally, the upper mold has a clearance hole for avoiding the positioning block, and the clearance hole is connected to the mounting hole.

[0013] By adopting the above technical solution, when the first insert moves along the inclined surface of the plastic workpiece, the positioning block abuts against the side wall of the clearance hole, thereby restricting the position of the first insert; thus avoiding excessive squeezing of the arc-shaped thin-walled component of the plastic workpiece by the first insert, and reducing the risk of damage to the arc-shaped thin-walled component.

[0014] Optionally, the upper surface of the positioning block is flush with the upper surface of the first insert.

[0015] By adopting the above technical solution, the upper end face of the positioning block is flush with the upper end face of the first insert, so as to facilitate the machining of clearance holes on the upper mold.

[0016] Optionally, the first insert has two arc-shaped abutment surfaces spaced apart, and the first end of the first insert is also provided with a separator, which is disposed between the two arc-shaped abutment surfaces.

[0017] By adopting the above technical solution, when there are two adjacent arc-shaped thin-walled parts on a plastic workpiece, the improvement of the first end of the first insert allows the first insert to be processed into two adjacent arc-shaped thin-walled parts at the same time, reducing mold development costs.

[0018] Optionally, the two arc-shaped contact surfaces of the first insert are located on the same arc-shaped surface.

[0019] By adopting the above technical solution, the two arc-shaped contact surfaces of the first insert are located on the same arc surface, which is beneficial to the production of plastic workpieces.

[0020] Optionally, the first ejector pin is elastically connected to the first insert.

[0021] By adopting the above technical solution, the first ejector pin and the first insert are elastically connected, thereby facilitating the separation of the arc-shaped contact surface in the first insert from the arc-shaped thin-walled component in the plastic workpiece.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. When a plastic workpiece needs to be demolded, the ejector plate first forces the first insert to move towards the plastic workpiece. The first insert moves along the inclined surface of the plastic workpiece, causing the arc-shaped contact surface of the first insert to move towards the arc-shaped thin-walled component of the plastic workpiece, so that the arc-shaped contact surface and the arc-shaped thin-walled component are initially separated. Subsequently, the ejector plate pulls the first insert to move away from the plastic workpiece, so that the arc-shaped contact surface of the first insert is completely separated from the arc-shaped thin-walled component of the plastic workpiece, thereby completing the demolding of the plastic workpiece. Then, a robot arm is used to remove the plastic workpiece. That is, through the coordinated cooperation of the arc-shaped contact surface and the guide surface on the first insert, the demolding of the first insert from the arc-shaped thin-walled component in the plastic workpiece is facilitated, the risk of damage to the arc-shaped thin-walled component is reduced, the quality of the plastic workpiece is improved, and production efficiency is also improved. 2. After the first insert moves along the inclined surface of the plastic workpiece, the positioning block abuts against the side wall of the clearance hole, thereby restricting the position of the first insert; to avoid the first insert excessively squeezing the arc-shaped thin-walled component of the plastic workpiece, and reduce the risk of damage to the arc-shaped thin-walled component; 3. When there are two adjacent arc-shaped thin-walled parts on a plastic workpiece, by improving the first end of the first insert, the first insert can be processed into two adjacent arc-shaped thin-walled parts at the same time, reducing the mold development cost. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the plastic workpiece in this embodiment.

[0024] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0025] Figure 3 This is a partial cross-sectional view of the plastic workpiece in this embodiment.

[0026] Figure 4 This is a schematic diagram of the injection mold in this embodiment.

[0027] Figure 5 This is a schematic diagram of the injection mold in this embodiment.

[0028] Figure 6 This is a schematic diagram of the molding die in this embodiment.

[0029] Figure 7 yes Figure 6 Enlarged view of point B in the middle.

[0030] Figure 8 This is a schematic diagram of the structure of the first insert in this embodiment.

[0031] Figure 9 yes Figure 8 A magnified view of point C in the middle.

[0032] Figure 10 This is a schematic diagram of the structure of the first insert in this embodiment.

[0033] Figure 11 yes Figure 10 Enlarged view of point D in the middle.

[0034] Figure 12 This is a schematic diagram of the structure of the first insert in this embodiment.

[0035] Explanation of reference numerals in the attached drawings: 1. Plastic workpiece; 11. Arc-shaped thin-walled component; 12. Inclined surface; 2. Ejector plate; 3. First ejector pin; 4. First insert; 41. Arc-shaped contact surface; 42. Guide surface; 43. Positioning block; 44. Separator; 5. Guide sleeve; 51. Guide hole; 6. Molding mold; 61. Upper mold; 611. Mounting hole; 612. Clearance hole; 62. Lower mold. Detailed Implementation

[0036] The following is in conjunction with the appendix Figure 1 -12 provides further details regarding this application.

[0037] This application discloses an injection mold for thin-walled parts. (Refer to...) Figures 1 to 3 In this embodiment, the thin-walled component is a plastic workpiece 1, and the plastic workpiece 1 has two sets of arranged arc-shaped thin-walled components 11, which are vertically arranged; each set of arc-shaped thin-walled components 11 includes two spaced-apart arc-shaped thin-walled components 11. Furthermore, the plastic workpiece 1 has a slope 12, which is arranged opposite to the arc-shaped thin-walled components 11. The injection mold of this application is used to produce the plastic workpiece 1.

[0038] Reference Figure 4 and Figure 5 The injection mold for thin-walled parts includes an ejector plate 2, a first ejector pin 3, a first insert 4, a guide sleeve 5, and a molding die 6.

[0039] Reference Figure 5 The molding die 6 includes an upper die 61 and a lower die 62. The upper die 61 and the lower die 62 are closed to form a receiving cavity, which is used to receive the plastic workpiece 1.

[0040] Reference Figure 6 and Figure 7 One end of the first ejector pin 3 is fixed on the ejector plate 2, and the other end of the first ejector pin 3 is connected to the first insert rod 4. The ejector plate 2 moves to drive the first ejector pin 3 and the first insert rod 4 to move.

[0041] Reference Figure 7 The upper mold 61 has mounting holes 611 for the first insert 4 to pass through. The end of the first insert 4 away from the ejector plate 2 is the first end, and the first component of the first insert 4 is disposed in the receiving cavity. In this embodiment, the first ejector pin 3 is elastically connected to the first insert 4; the elastic connection between the first ejector pin 3 and the first insert 4 facilitates the separation of the arc-shaped abutment surface 41 in the first insert 4 from the arc-shaped thin-walled component 11 in the plastic workpiece 1.

[0042] Reference Figure 4 and Figure 5 The guide sleeve 5 is fixed to the upper mold 61, and the guide sleeve 5 has a guide hole 51 for the first ejector pin 3 to pass through; thereby, the guide hole 51 on the guide sleeve 5 is used to limit the position of the first ejector pin 3 and improve the accuracy of the ejector pin movement.

[0043] Reference Figures 8 to 9 The first end of the first insert 4 is provided with an arc-shaped abutment surface 41 and a guide surface 42. The arc-shaped abutment surface 41 and the guide surface 42 are arranged opposite to each other. The arc-shaped abutment surface 41 of the first insert 4 is in contact with the arc-shaped thin-walled component 11 of the plastic workpiece 1.

[0044] Reference Figure 10 and Figure 11 The guide surface 42 of the first insert 4 is in contact with the inclined surface 12 of the plastic workpiece 1. When the first insert 4 moves toward the plastic workpiece 1, the inclined surface 12 of the plastic workpiece 1 forces the arc-shaped contact surface 41 to move toward the arc-shaped thin-walled component 11 of the plastic workpiece 1.

[0045] Reference Figure 12 The first insert 4 has two arc-shaped abutment surfaces 41 spaced apart. The first end of the first insert 4 is also provided with a separator 44, which is located between the two arc-shaped abutment surfaces 41. The two arc-shaped abutment surfaces 41 of the first insert 4 are located on the same arc-shaped surface.

[0046] In this embodiment, the plastic workpiece 1 has two adjacent arc-shaped thin-walled components 11. By improving the first end of the first insert 4, two adjacent arc-shaped thin-walled components 11 can be processed simultaneously on the first insert 4, reducing mold development costs. The two arc-shaped contact surfaces 41 of the first insert 4 are located on the same arc-shaped surface, which is beneficial for the production of the plastic workpiece 1.

[0047] Reference Figure 7 The first insert 4 has a second end near the ejector plate 2, and a positioning block 43 protrudes from the second end of the first insert 4. The positioning block 43 serves a positioning function to improve the installation stability of the first insert 4. The upper end face of the positioning block 43 is flush with the upper end face of the first insert 4 to facilitate the machining of a clearance hole 612 on the upper mold 61. At the same time, the upper mold 61 has a clearance hole 612 for the positioning block 43, and the clearance hole 612 communicates with the mounting hole 611.

[0048] The implementation principle of an injection mold for a thin-walled part according to an embodiment of this application is as follows: Reference Figure 8 and Figure 9 When the plastic workpiece 1 needs to be demolded, the ejector plate 2 first forces the first insert 4 to move toward the plastic workpiece 1. The first insert 4 moves along the inclined surface 12 of the plastic workpiece 1, so that the arc-shaped contact surface 41 of the first insert 4 moves toward the arc-shaped thin-walled component 11 of the plastic workpiece 1, so that the arc-shaped contact surface 41 and the arc-shaped thin-walled component 11 are initially separated. Then, the ejector plate 2 pulls the first insert 4 to move away from the plastic workpiece 1, so that the arc-shaped contact surface 41 of the first insert 4 is completely separated from the arc-shaped thin-walled component 11 of the plastic workpiece 1, thereby completing the demolding of the plastic workpiece 1. Then, the robot arm is used to remove the plastic workpiece 1.

[0049] That is, through the coordinated cooperation of the arc-shaped contact surface 41 and the guide surface 42 on the first insert 4, it is easy to demold the first insert 4 from the arc-shaped thin-walled component 11 in the plastic workpiece 1, reducing the risk of damage to the arc-shaped thin-walled component 11, improving the quality of the plastic workpiece 1, and also improving production efficiency.

[0050] When the first insert 4 moves along the inclined surface 12 of the plastic workpiece 1, the positioning block 43 abuts against the side wall of the clearance hole 612, thereby restricting the position of the first insert 4; in order to avoid the first insert 4 excessively squeezing the arc-shaped thin-walled component 11 of the plastic workpiece 1, and reduce the risk of damage to the arc-shaped thin-walled component 11.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An injection mold for a thin-walled part, characterized in that: The system includes an ejector plate (2), a first ejector pin (3), a first insert (4), and a molding die (6). The molding die (6) includes an upper die (61) and a lower die (62). The upper die (61) and the lower die (62) are closed to form a receiving cavity, which is used to receive a plastic workpiece (1). The plastic workpiece (1) has a vertically arranged arc-shaped thin-walled component (11). The upper die (61) has a mounting hole (611) for the first insert (4) to pass through. One end of the first ejector pin (3) is fixed to the ejector plate (2), and the other end of the first ejector pin (3) is connected to the first insert (4). The ejector plate (2) moves to drive the first ejector pin (3) and the first insert (4) to move. The first insert (4) has a first end point away from the ejector plate (2). The first end point of the first insert (4) is provided with an arc-shaped abutment surface (41) and a guide surface (42). The arc-shaped abutment surface (41) and the guide surface (42) are arranged opposite to each other. The arc-shaped abutment surface (41) of the first insert (4) is in contact with the arc-shaped thin-walled component (11) of the plastic workpiece (1). The plastic workpiece (1) is provided with a slope (12). The guide surface (42) of the first insert (4) is in contact with the slope (12) of the plastic workpiece (1). When the first insert (4) moves toward the plastic workpiece (1), the slope (12) of the plastic workpiece (1) forces the arc-shaped abutment surface (41) to move toward the arc-shaped thin-walled component (11) of the plastic workpiece (1).

2. The injection mold for thin-walled parts according to claim 1, characterized in that: It also includes a guide sleeve (5), which is fixed to the upper mold (61), and the guide sleeve (5) has a guide hole (51) for the first ejector pin (3) to pass through.

3. The injection mold for thin-walled parts according to claim 1, characterized in that: The first insert (4) has a second end near the ejector plate (2), and a positioning block (43) protrudes from the second end of the first insert (4).

4. The injection mold for thin-walled parts according to claim 3, characterized in that: The upper mold (61) has a clearance hole (612) for avoiding the positioning block (43), and the clearance hole (612) is connected to the mounting hole (611).

5. The injection mold for thin-walled parts according to claim 4, characterized in that: The upper surface of the positioning block (43) is flush with the upper surface of the first insert (4).

6. The injection mold for thin-walled parts according to claim 1, characterized in that: The first insert (4) has two arc-shaped contact surfaces (41) spaced apart, and the first end of the first insert (4) is also provided with a separator (44), which is located between the two arc-shaped contact surfaces (41).

7. The injection mold for thin-walled parts according to claim 6, characterized in that: The two arc-shaped contact surfaces (41) of the first insert (4) are located on the same arc surface.

8. The injection mold for thin-walled parts according to claim 1, characterized in that: The first ejector pin (3) is elastically connected to the first insert (4).

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