Injection mold back mold core-pulling demolding structure

Abstract

The utility model belongs to injection molding technical field discloses a kind of injection mould back mould core-pulling stripping structure, including front mould plate and back mould plate, and the mould face of back mould plate is provided with top block, and the lower portion of top block is provided with ejector plate, and connecting rod is arranged between top block and ejector plate, and ejector plate can be lifted and moved, and then drive top block to rise or drop to the mould face of back mould plate;Core-pulling is arranged in top block, and the first end of core-pulling is flush with the top material profile of top block, and the second end of core-pulling exposes top block and is provided with limit block, and the limit slot that is matched with limit block is arranged in back mould plate, so that core-pulling is limited to move in the process that top block rises the mould face of back mould plate, and then stripping is realized.The utility model designs simple mechanical structure and cooperates top block movement to realize the stripping action of core-pulling, without additional oil cylinder, action is stable, structure is reliable, precision is easy to control, maintenance is convenient, and the qualified rate of product is improved.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and in particular to a core-pulling and demolding structure for the rear mold of an injection mold. Background Technology

[0002] In mold design and actual manufacturing, core-pulling structures are one of the most common demolding structures. When designing injection molds, the complex undercut structures and limited space for core-pulling demolding due to product structural requirements impose strict requirements on the mold's demolding action, increasing design complexity.

[0003] Traditional core-pulling methods use hydraulic cylinders (or pneumatic cylinders) for direct core pulling. The cylinders are positioned on the side of the mold plate, with the pulling direction perpendicular to or at a certain angle to the mold opening direction. This method offers high pulling force and controllable stroke, but requires reserved space outside the mold for cylinder installation and the configuration of oil circuits, induction switches, etc., significantly increasing the overall width and thickness of the mold. This makes it difficult to meet the demands of modern injection molding production, such as miniaturization, multi-cavity designs, and in-machine rotation. Furthermore, hydraulic cylinders inherently suffer from problems such as oil leakage, oil temperature fluctuations, and high maintenance costs, necessitating technological improvements. Utility Model Content

[0004] The purpose of this utility model is to provide a core-pulling and demolding structure for the rear mold of an injection mold, which enables convenient demolding of the rear mold core within a limited space without the use of a hydraulic cylinder.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A core-pulling demolding structure for the rear mold of an injection mold includes a front mold plate and a rear mold plate. A top block is provided on the mold-closing surface of the rear mold plate, and an ejector plate is provided below the top block. A connecting rod is provided between the top block and the ejector plate. The ejector plate can move up and down, thereby driving the top block to rise above or fall below the mold-closing surface of the rear mold plate. A core is pulled through the top block. The first end of the core is flush with the ejector surface of the top block, and the second end of the core protrudes from the top block and is provided with a limit block. A limit groove that cooperates with the limit block is provided in the rear mold plate, so that the movement of the core is restricted when the top block rises above the mold-closing surface of the rear mold plate, thereby realizing demolding.

[0007] As an alternative, the ejection direction of the top block is consistent with the mold opening direction of the front template, the demolding direction of the core pull forms an obtuse angle with the mold opening direction of the front template, and the movement direction of the limiting block in the limiting groove forms an acute angle with the mold opening direction of the front template.

[0008] As an alternative, the limiting block has a T-shaped cross-section, and the limiting groove is a T-shaped groove that fits the limiting block.

[0009] As an alternative, the surface of the core puller is provided with a pressure-resistant and wear-resistant block that makes frictional contact with the top block.

[0010] As an alternative, guide brackets are provided on both sides of the top block, and guide grooves that cooperate with the guide brackets are provided in the rear template.

[0011] As an alternative, a base plate is provided below the rear template, forming a cavity between the rear template and the base plate, and the ejector plate is placed in the cavity.

[0012] As an optional solution, a guide sleeve and a pressure plate for limiting the guide sleeve are provided on the lower surface of the rear template, and the connecting rod passes through the guide sleeve.

[0013] As an alternative, a rear mold core is provided on the rear template, a top block is embedded in the rear mold core, and an insert is provided on the rear mold core.

[0014] As an alternative, a first cooling channel is provided in the rear mold plate, rear mold core, and insert.

[0015] As an alternative, a second cooling channel is provided in the connecting rod and the top block.

[0016] The beneficial effects of this utility model are:

[0017] The injection mold rear mold core-pulling demolding structure features a simple mechanical design and, in conjunction with the movement of the ejector block, achieves the core-pulling demolding action. It eliminates the need for additional hydraulic cylinders, ensures stable operation, reliable structure, easy precision control, and convenient maintenance, thereby improving the product qualification rate. Attached Figure Description

[0018] Figure 1 This is a first cross-sectional view of the injection mold rear mold core-pulling and demolding structure provided in this embodiment of the utility model when the top block is ejected.

[0019] Figure 2 This is a second cross-sectional view of the injection mold rear mold core-pulling and demolding structure provided in this embodiment of the utility model when the top block is ejected.

[0020] Figure 3 This is a first cross-sectional view of the injection mold rear mold core-pulling and demolding structure provided in this embodiment of the utility model when the top block is not ejected;

[0021] Figure 4 This is a second cross-sectional view of the injection mold rear mold core-pulling and demolding structure provided in this embodiment of the utility model when the top block is not ejected;

[0022] Figure 5 This is a schematic diagram of the top block and core-pulling assembly involved in an embodiment of this utility model;

[0023] Figure 6 yes Figure 3 Enlarged view of point A in the middle.

[0024] In the attached image:

[0025] 1. Front mold plate; 2. Rear mold plate; 3. Ejector block; 4. Ejector plate; 5. Connecting rod; 6. Core pulling; 7. Limiting block; 8. Limiting groove; 9. Pressure-resistant and wear-resistant block; 10. Guide platform; 11. Base plate; 12. Cavity; 13. Guide sleeve; 14. Pressure plate; 15. Rear mold core; 16. Insert; 17. First cooling channel; 18. Second cooling channel; 19. Cooling water connector. Detailed Implementation

[0026] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] like Figures 1 to 6As shown, this utility model provides a core-pulling and demolding structure for the rear mold of an injection mold, including a front mold plate 1 and a rear mold plate 2. A top block 3 is provided on the mold-closing surface of the rear mold plate 2 that mates with the front mold plate 1. An ejector plate 4 is provided below the top block 3. A connecting rod 5 is provided between the top block 3 and the ejector plate 4. The ejector plate 4 can move up and down, thereby driving the top block 3 to rise above or fall below the mold-closing surface of the rear mold plate 2. A core-pulling device 6 is provided through the top block 3. The first end of the core-pulling device 6 is flush with the ejector surface of the top block 3. The second end of the core-pulling device 6 protrudes from the top block 3 and is provided with a limiting block 7. A limiting groove 8 that mates with the limiting block 7 is provided in the rear mold plate 2, so that the core-pulling device 6 is restricted from moving when the top block 3 rises above the mold-closing surface of the rear mold plate 2, thereby achieving demolding.

[0031] Thus, the demolding action of the core-pulling 6 is achieved through a simple mechanical structure and the movement of the top block 3. No additional hydraulic cylinder is required. The action is stable, the structure is reliable, the precision is easy to control, the maintenance is convenient, and the product qualification rate is improved.

[0032] In this embodiment, the ejection direction of the top block 3 is consistent with the mold opening direction of the front template 1, the demolding direction of the core pull 6 forms an obtuse angle with the mold opening direction of the front template 1, and the moving direction of the limiting block 7 in the limiting groove 8 forms an acute angle with the mold opening direction of the front template 1.

[0033] For details regarding the ejection direction of the top block 3, the demolding direction of the core puller 6, and the movement direction of the limiting block 7 in the limiting groove 8, please refer to [link to relevant documentation]. Figure 6 When the top block 3 moves upward, the limiting block 7 moves obliquely upward along the limiting groove 8, which in turn drives the core puller 6 to move obliquely upward, so that the core puller 6 moves obliquely downward relative to the top block 3. The specific values ​​of the obtuse angle and the acute angle are not limited, as long as the core puller 6 and the limiting block 7 can move smoothly relative to the top block 3.

[0034] To ensure that the limiting block 7 can only move in a specific direction, the cross section of the limiting block 7 is designed to be T-shaped, and the limiting groove 8 is a T-shaped groove that is adapted to the limiting block 7.

[0035] Optionally, the surface of the core puller 6 is provided with a pressure-resistant and wear-resistant block 9 that rubs against the top block 3, thereby ensuring that the core puller 6 can move smoothly relative to the top block 3 for a long time so that the core puller 6 can be demolded as the top block 3 is lifted up.

[0036] Optionally, guide brackets 10 are provided on both sides of the top block 3, and guide grooves that cooperate with the guide brackets 10 are provided in the rear template 2 to prevent the top block 3 from tipping over and shifting due to force during the ejection process.

[0037] Optionally, a base plate 11 is provided below the rear template 2, and a cavity 12 is formed between the rear template 2 and the base plate 11. The ejector plate 4 is disposed in the cavity 12 to restrict the ejector plate 4 to only move up and down, so as to ensure the stable ejection action of the ejector block 3.

[0038] Furthermore, a guide sleeve 13 and a pressure plate 14 for limiting the guide sleeve 13 are provided on the lower surface of the rear template 2, and the connecting rod 5 passes through the guide sleeve 13; the guide sleeve 13 cooperates with the connecting rod 5 to ensure accurate axial movement of the connecting rod 5.

[0039] Optionally, a rear mold core 15 is provided on the rear mold plate 2, the top block 3 is embedded in the rear mold core 15, and an insert 16 is provided on the rear mold core 15. Further, a first cooling channel 17 is provided in the rear mold plate 2, the rear mold core 15 and the insert 16; a second cooling channel 18 is provided in the connecting rod 5 and the top block 3, and a cooling water connector 19 is provided at the end of the connecting rod 5; the injection temperature is precisely controlled through the first cooling channel 17 and the second cooling channel 18.

[0040] The assembly process of the injection mold rear mold core-pulling and demolding structure:

[0041] ① Install the limiting block 7 and the pressure-resistant and wear-resistant block 9 on the core puller 6;

[0042] ② Install the connecting rod 5 onto the top block 3;

[0043] ③ Insert the core puller 6 into the top block 3;

[0044] ④ Install the guide sleeve 13 and pressure plate 14 on the rear template 2;

[0045] ⑤ Install the ejector plate 4 (including the ejector face plate and the ejector base plate) onto the rear template 2;

[0046] ⑥ Install the combination of top block 3 and core puller 6 and insert 16 onto the rear template 2;

[0047] ⑦ Install the base plate 11 and the hot runner plate on the rear template 2 to complete the overall assembly of the mold;

[0048] ⑧ Close the front template 1 and the rear template together to complete the installation of the entire mold.

[0049] The opening and closing process of the injection mold's rear mold core-pulling and demolding structure:

[0050] Step 1: Mold opening;

[0051] Step Two: Driven by the ejector plate 4, the top block 3 ejects the product, simultaneously causing the core puller 6 to slide under the limiting and guiding action of the limiting groove 8, thus disengaging the core puller 6 from the product's inverted clip. Figure 1 and Figure 2 The state shown;

[0052] Step 3: If the product has ribs clamping it in the area of ​​the top block 3, a second ejection mold is required. If there are no ribs clamping it, the part can be removed directly.

[0053] Step 4: Top block 3 resets, simultaneously resetting core puller 6 until... Figure 3 and Figure 4 The state shown;

[0054] Step 5: Mold closing.

[0055] In summary, the post-molding core-pulling and demolding structure of this injection mold has the following advantages:

[0056] 1) Relying on the linkage of the top block 3 and the core pulling 6, there is no need to set up an additional hydraulic cylinder, thus avoiding the problems of high space requirements and high maintenance costs associated with hydraulic cylinder drive methods;

[0057] 2) The purely mechanical form makes the overall structure reliable in terms of stress and movement, thus improving the product qualification rate;

[0058] 3) The structural components are easy to process, the precision is easy to control, and maintenance is also very convenient.

[0059] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A core-pulling and demolding structure for the rear mold of an injection mold, characterized in that, Includes a front template (1) and a rear template (2). A top block (3) is provided on the mold closing surface of the rear template (2). An ejector plate (4) is provided below the top block (3). A connecting rod (5) is provided between the top block (3) and the ejector plate (4). The ejector plate (4) can move up and down, thereby driving the top block (3) to rise above or fall below the mold closing surface of the rear template (2). A core puller (6) is inserted through the top block (3). The first end of the core puller (6) is flush with the ejector surface of the top block (3). The second end of the core puller (6) protrudes from the top block (3) and is provided with a limiting block (7). A limiting groove (8) that cooperates with the limiting block (7) is provided in the rear template (2), so that the core puller (6) is restricted from moving when the top block (3) is higher than the mold closing surface of the rear template (2), thereby realizing demolding.

2. The injection mold rear mold core-pulling and demolding structure according to claim 1, characterized in that, The ejection direction of the top block (3) is consistent with the mold opening direction of the front template (1), the demolding direction of the core puller (6) forms an obtuse angle with the mold opening direction of the front template (1), and the moving direction of the limiting block (7) in the limiting groove (8) forms an acute angle with the mold opening direction of the front template (1).

3. The injection mold rear mold core-pulling and demolding structure according to claim 1, characterized in that, The limiting block (7) has a T-shaped cross section, and the limiting groove (8) is a T-shaped groove adapted to the limiting block (7).

4. The injection mold rear mold core-pulling and demolding structure according to claim 1, characterized in that, The surface of the core puller (6) is provided with a pressure-resistant and wear-resistant block (9) that rubs against the top block (3).

5. The injection mold rear mold core-pulling and demolding structure according to claim 1, characterized in that, The top block (3) has guide brackets (10) on both sides, and the rear template (2) has guide grooves that cooperate with the guide brackets (10).

6. The injection mold rear mold core-pulling and demolding structure according to claim 1, characterized in that, A base plate (11) is provided below the rear template (2), and a cavity (12) is formed between the rear template (2) and the base plate (11), and the ejector plate (4) is disposed in the cavity (12).

7. The injection mold rear mold core-pulling and demolding structure according to claim 6, characterized in that, The lower surface of the rear template (2) is provided with a guide sleeve (13) and a pressure plate (14) for limiting the guide sleeve (13), and the connecting rod (5) passes through the guide sleeve (13).

8. The injection mold rear mold core-pulling and demolding structure according to claim 1, characterized in that, The rear template (2) is provided with a rear mold core (15), the top block (3) is embedded in the rear mold core (15), and the rear mold core (15) is provided with an insert (16).

9. The injection mold rear mold core-pulling and demolding structure according to claim 8, characterized in that, The rear template (2), the rear mold core (15), and the insert (16) are provided with a first cooling channel (17).

10. The injection mold rear mold core-pulling and demolding structure according to claim 1, characterized in that, A second cooling channel (18) is provided in the connecting rod (5) and the top block (3).

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