Demolding mechanism

Abstract

The utility model relates to the technical field of injection mold demolding, in particular to a demolding mechanism which comprises a lower mold, an upper mold and an inverted buckle assembly, an injection molding cavity is formed in the mold closing end of the lower mold; an inclined ejector block capable of being inserted into the injection molding cavity is arranged at the mold closing end of the upper mold, and the diameter of the inclined ejector block is gradually reduced in the direction away from the upper mold; the back-off assembly comprises a mounting block arranged at the mold closing end of the lower mold and a back-off mandrel located in the injection molding cavity, the mounting block is provided with a limiting block extending into the injection molding cavity, the extending direction of the limiting block perpendicularly faces the axis of the injection molding cavity, the back-off mandrel is provided with a through hole for the limiting block to penetrate through, and the limiting block is arranged in the through hole. And the back-off mandrel can be attached to the outer side wall of the inclined ejector block to slide. According to the utility model, the separation from the inverted buckle can be quickly completed.

Description

Technical Field

[0001] The utility model relates to the technical field of injection mold demoulding, in particular to a demoulding mechanism. Background Art

[0002] Injection molding has the advantages of low cost, high production efficiency, and high product precision. Therefore, injection molded products can be found in the fields of automobiles, electronics, home appliances, medical devices, daily necessities, etc. In order to meet the assembly reliability of the corresponding products, some cover-shaped products usually have undercuts on the inner wall of the product, such as Figure 1 As shown, the existence of undercuts requires consideration of how to avoid undercuts during the demolding process, which results in a more complicated mold demolding structure. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a demoulding mechanism which can quickly complete the separation from the undercut.

[0004] In order to solve the above technical problems, the technical solution adopted by the utility model is: a demoulding mechanism, including a lower mold, an upper mold and an undercut assembly; the mold end of the lower mold is provided with an injection cavity;

[0005] The clamping end of the upper mold is provided with an inclined ejector block capable of being inserted into the injection cavity, and the diameter of the inclined ejector block gradually decreases away from the upper mold;

[0006] The undercut assembly includes a mounting block arranged on the lower mold closing end and an undercut core shaft located in the injection molding cavity, the mounting block has a limit block extending into the injection molding cavity, and the extension direction of the limit block is perpendicular to the axis of the injection molding cavity, and the undercut core shaft is provided with a through hole for the limit block to pass through, and the undercut core shaft can slide on the outer side wall of the inclined top block.

[0007] Furthermore, a slide groove is arranged on the outer side wall of the inclined ejector block, and the undercut mandrel is slidably arranged in the slide groove.

[0008] Furthermore, the width of one end of the undercut mandrel away from the mounting block is greater than the width of one end of the undercut mandrel close to the mounting block.

[0009] Furthermore, the inclined ejector block is provided with an injection through hole connected with the injection hole of the upper mold along its own axial direction.

[0010] Furthermore, the diameter of the injection through hole gradually decreases away from the upper mold.

[0011] The beneficial effect of the utility model is that: an inclined ejector block is added to the upper mold, and an undercut assembly is added to the lower mold. During the mold closing process, the inclined ejector block gradually enters the injection molding cavity of the lower mold. Since the undercut mandrel can slide on the outer side wall of the inclined ejector block, and the undercut mandrel is limited by the sliding direction of the limit block, the undercut mandrel can only gradually move away from the axis of the injection molding cavity along the limit block, so that the inclined ejector block and the undercut mandrel are enclosed in the injection molding cavity of the lower mold to form a cavity shape for injection molding a cover-shaped product with an undercut. During the demoulding process, the lower mold is controlled to separate from the upper mold, so that the inclined ejector block gradually withdraws from the injection molding cavity of the lower mold. Since the undercut mandrel can slide on the outer side wall of the inclined ejector block, and the undercut mandrel is limited by the sliding direction of the limit block, the undercut mandrel can only gradually move away from the axis of the injection molding cavity along the limit block, so that the undercut mandrel is separated from the undercut on the cover-shaped product. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of a vehicle glass guide rail;

[0013] Figure 2 A schematic diagram of the cross-sectional structure of a demoulding mechanism proposed in the utility model Figure 1 ;

[0014] Figure 3 for Figure 2 An enlarged view of part A of a demoulding mechanism;

[0015] Figure 4 A schematic diagram of the cross-sectional structure of a demoulding mechanism proposed in the utility model Figure 2 ;

[0016] Figure 5 for Figure 4 An enlarged view of part B of a demoulding mechanism;

[0017] Description of labels:

[0018] 1. Lower mold;

[0019] 2. upper die; 21. inclined ejector block; 211. slideway; 212. injection hole;

[0020] 3. Undercut assembly; 31. Mounting block; 311. Limit block; 32. Undercut mandrel; 321. Perforation;

[0021] 4. Cover-shaped products; 41. Inverted. DETAILED DESCRIPTION

[0022] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0023] Please refer to Figure 2 and Figure 3As shown, the utility model provides a demoulding mechanism, comprising a lower mold 1, an upper mold 2 and an undercut assembly 3; the mold closing end of the lower mold 1 is provided with an injection cavity;

[0024] The clamping end of the upper mold 2 is provided with an inclined ejector block 21 which can be inserted into the injection cavity, and the diameter of the inclined ejector block 21 gradually decreases away from the upper mold 2;

[0025] The undercut assembly 3 includes a mounting block 31 arranged on the closing end of the lower mold 1 and an undercut core shaft 32 located in the injection cavity, the mounting block 31 has a limit block 311 extending into the injection cavity, and the extension direction of the limit block 311 is perpendicular to the axis of the injection cavity, and the undercut core shaft 32 is provided with a through hole 321 for the limit block 311 to pass through, and the undercut core shaft 32 can slide on the outer side wall of the inclined top block 21.

[0026] Working principle: During the mold closing process, the inclined ejector block 21 gradually enters the injection molding cavity of the lower mold 1. Since the undercut mandrel 32 can slide on the outer wall of the inclined ejector block 21, and the sliding direction of the undercut mandrel 32 is limited by the limit block 311, the undercut mandrel 32 can only gradually move away from the axis of the injection molding cavity along the limit block 311, so that the inclined ejector block 21 and the undercut mandrel 32 are enclosed in the injection molding cavity of the lower mold 1 to form a cavity shape for injecting a cover-shaped product 4 with an undercut 41.

[0027] During the demolding process, the lower mold 1 is controlled to separate from the upper mold 2 so that the inclined ejector block 21 gradually withdraws from the injection molding cavity of the lower mold 1. Since the inverted core shaft 32 can slide on the outer wall of the inclined ejector block 21, and the sliding direction of the inverted core shaft 32 is limited by the limit block 311, the inverted core shaft 32 can only gradually approach the axis of the injection molding cavity along the limit block 311, thereby separating the inverted core shaft 32 from the inverted 41 on the cover-shaped product 4.

[0028] Please refer to Figure 4 and Figure 5 As shown, further, a slide groove 211 is provided on the outer side wall of the inclined ejector block 21 , and the undercut mandrel 32 is slidably disposed in the slide groove 211 .

[0029] It can be known from the above description that the slide groove 211 can be used to enable the undercut mandrel 32 to slide along the outer side wall of the inclined ejector block 21 .

[0030] Please refer to Figure 5 As shown, further, the width of one end of the undercut mandrel 32 away from the mounting block 31 is greater than the width of one end of the undercut mandrel 32 close to the mounting block 31 .

[0031] From the above description, it can be seen that the width of the end of the inverted core shaft 32 away from the mounting block 31 is set larger, and the inverted core shaft 32 and the inclined lift block 21 can be connected in the form of mortise and tenon, thereby preventing the inverted core shaft 32 from separating from the inclined lift block 21 during the movement of the inverted core shaft 32 along the axis of the limit block 311 away from the injection cavity.

[0032] Please refer to Figure 2 and Figure 3 As shown, further, the inclined ejector block 21 is provided with an injection through hole 212 connected with the injection hole of the upper mold 2 along its own axial direction.

[0033] It can be seen from the above description that during the injection molding process, the material is injected through the injection hole 212, which can ensure that the material is evenly diffused to all parts of the cavity of the enclosed cover-shaped product 4 as much as possible.

[0034] Please refer to Figure 3 As shown, further, the diameter of the injection hole 212 gradually decreases away from the upper mold 2.

[0035] From the above description, it can be known that the diameter of the injection hole 212 gradually decreases away from the upper mold 2, which can increase the flow rate and pressure of the material and ensure that the material fully fills the cavity of the enclosed cover product 4.

[0036] Embodiment 1

[0037] Please refer to Figure 2 and Figure 3 As shown, a demoulding mechanism comprises a lower mold 1, an upper mold 2 and an undercut assembly 3; the lower mold 1 is provided with an injection cavity at the mold closing end; the upper mold 2 is provided with an inclined ejector block 21 which can be inserted into the injection cavity, and the diameter of the inclined ejector block 21 gradually decreases away from the upper mold 2; the undercut assembly 3 comprises a mounting block 31 arranged on the mold closing end of the lower mold 1 and an undercut mandrel 32 located in the injection cavity, the mounting block 31 has a limit block 311 extending into the injection cavity, and the extension direction of the limit block 311 is perpendicular to the axis of the injection cavity, the undercut mandrel 32 is provided with a through hole 321 for the limit block 311 to pass through, and the undercut mandrel 32 can slide on the outer side wall of the inclined ejector block 21. The inclined ejector block 21 is provided with an injection through hole 212 connected with the injection hole of the upper mold 2 along its own axial direction. The diameter of the injection hole 212 gradually decreases away from the upper mold 2 .

[0038] Working principle: During the mold closing process, the inclined ejector block 21 gradually enters the injection molding cavity of the lower mold 1. Since the undercut mandrel 32 can slide on the outer wall of the inclined ejector block 21, and the sliding direction of the undercut mandrel 32 is limited by the limit block 311, the undercut mandrel 32 can only gradually move away from the axis of the injection molding cavity along the limit block 311, so that the inclined ejector block 21 and the undercut mandrel 32 are enclosed in the injection molding cavity of the lower mold 1 to form a cavity shape for injecting a cover-shaped product 4 with an undercut 41.

[0039] During the demolding process, the lower mold 1 is controlled to separate from the upper mold 2 so that the inclined ejector block 21 gradually withdraws from the injection molding cavity of the lower mold 1. Since the inverted core shaft 32 can slide on the outer wall of the inclined ejector block 21, and the sliding direction of the inverted core shaft 32 is limited by the limit block 311, the inverted core shaft 32 can only gradually approach the axis of the injection molding cavity along the limit block 311, thereby separating the inverted core shaft 32 from the inverted 41 on the cover-shaped product 4.

[0040] Embodiment 2

[0041] This embodiment further defines the connection structure between the inclined ejector block 21 and the undercut mandrel 32 on the basis of the first embodiment, which is specifically as follows:

[0042] Please refer to Figure 4 and Figure 5 As shown, a slide groove 211 is provided on the outer side wall of the inclined ejector block 21, and the undercut mandrel 32 is slidably arranged in the slide groove 211. The width of the undercut mandrel 32 at one end away from the mounting block 31 is greater than the width of the undercut mandrel 32 at one end close to the mounting block 31.

[0043] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A demoulding mechanism, characterized in that: It comprises a lower mold, an upper mold and an undercut assembly; the mold clamping end of the lower mold is provided with an injection cavity; The clamping end of the upper mold is provided with an inclined ejector block capable of being inserted into the injection cavity, and the diameter of the inclined ejector block gradually decreases away from the upper mold; The undercut assembly includes a mounting block arranged on the lower mold closing end and an undercut core shaft located in the injection molding cavity, the mounting block has a limit block extending into the injection molding cavity, and the extension direction of the limit block is perpendicular to the axis of the injection molding cavity, and the undercut core shaft is provided with a through hole for the limit block to pass through, and the undercut core shaft can slide on the outer side wall of the inclined top block.

2. The demoulding mechanism according to claim 1, characterized in that: A slide groove is arranged on the outer side wall of the inclined top block, and the undercut mandrel is slidably arranged in the slide groove.

3. The demoulding mechanism according to claim 2, characterized in that: The width of one end of the undercut mandrel away from the mounting block is greater than the width of one end of the undercut mandrel close to the mounting block.

4. The demoulding mechanism according to claim 1, characterized in that: The inclined ejector block is provided with an injection through hole connected with the injection hole of the upper mold along its own axial direction.

5. The demoulding mechanism according to claim 4, characterized in that: The diameter of the injection through hole gradually decreases away from the upper mold.

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