Oblique ejection mechanism of automobile injection mold

Abstract

The invention relates to an oblique ejection mechanism of an automobile injection mold, which comprises a bottom plate and bottom square iron connected to the middle of the bottom plate, a mold opening direction Z is arranged upwards along the direction vertical to the bottom plate, an ejection direction Y is arranged obliquely towards one side along the mold opening direction, one side of the bottom square iron is connected with an auxiliary plate, and two sides of the auxiliary plate are connected with supporting ejector plates. The supporting ejector plate is arranged in the direction parallel to the ejection direction Y, the supporting ejector plate is connected with a telescopic driving piece, the telescopic driving piece is connected with a rear mold, the lower side of the rear mold is connected with an injection molding piece of an inverted buckle structure, the upper portion of the bottom square iron is connected with main square iron, and the main square iron and the injection molding piece of the inverted buckle structure are correspondingly arranged. The ejection mechanism has the beneficial effects that the ejection direction Y forming a certain included angle with the mold opening direction is set, and the rear mold and the whole set of ejection system mounted on the supporting ejector plate are directly driven by the telescopic driving part to synchronously move in the inclined direction, so that the inverted buckle structure obtains an inclined displacement when being separated from a mold cavity, and interference is effectively avoided.

Description

Technical Field

[0001] This invention belongs to the field of injection mold technology, and specifically relates to an inclined ejection mechanism for automotive injection molds. Background Technology

[0002] Injection molds are tools used to produce plastic products, and they also give plastic products a complete structure and precise dimensions. Injection molding is a processing method used to mass-produce certain complex-shaped parts. Specifically, it refers to injecting heated and molten plastic into the mold cavity under high pressure by an injection molding machine, and then obtaining the molded product after cooling and solidification.

[0003] In existing automotive interior design, customers often design injection molded parts with complex shapes in order to make the design aesthetically pleasing and stylish. This can easily cause the conventional ejection structure of the injection mold to fail to eject the parts smoothly, making normal industrial production impossible. Therefore, it is necessary to design an angled ejection mechanism to deal with this situation. Summary of the Invention

[0004] This invention provides an inclined ejection mechanism for automotive injection molds, which aims to solve the problem that the ejection direction of existing injection molds is inconsistent with the main demolding direction, and that conventional ejection structures of injection molds cannot smoothly eject parts.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An inclined ejection mechanism for an automotive injection mold is provided, comprising a base plate and a bottom square iron connected to the middle of the base plate. An opening direction Z is provided perpendicular to the base plate and upwards, and an ejection direction Y is provided inclined to one side along the opening direction. An auxiliary plate is connected to one side of the bottom square iron, and supporting ejector plates are connected to both sides of the auxiliary plate. The supporting ejector plates are arranged parallel to the ejection direction Y. A telescopic drive component is connected to the supporting ejector plate. A rear mold is connected to the telescopic drive component, and an undercut injection molded part is connected to the lower side of the rear mold. A main square iron is connected above the bottom square iron, and the main square iron is correspondingly arranged with the undercut injection molded part.

[0006] Preferably, the ejection direction Y is set at an angle to the mold opening direction Z, and the supporting ejector plate is set parallel to the ejection direction Y. The rear mold is directly driven by the telescopic drive component to complete the oblique synchronous ejection along the ejection direction Y, so that the demolding direction of the undercut structure is completely matched with the ejection direction. This fundamentally avoids the problems of tearing, scratching and sticking to the undercut part when demolding by conventional direct ejection mechanism, greatly reduces the defect rate of injection molded parts, and perfectly adapts to the high-precision molding and demolding requirements of complex deep undercut structure of automotive injection molded parts.

[0007] Furthermore, a secondary ejector plate is connected to the supporting ejector plate, and a limiting post is connected to the secondary ejector plate. The limiting post limits the movement of the rear mold to the demolding position.

[0008] Preferably, the limiting pins set on the secondary ejector plate can form a mechanical hard limit when the rear mold moves to the preset demolding position along the ejection direction Y, accurately locking the maximum stroke of the oblique ejection. This can strictly ensure that the rear mold can reach the complete demolding position every time it ejects, avoiding problems such as incomplete demolding of the undercut structure and sticking and tearing of the injection molded parts due to insufficient ejection stroke. It can also completely eliminate the problem of excessive ejection caused by stroke drift of the telescopic drive component and control failure, avoiding rigid collision damage between the rear mold and other parts of the mold. At the same time, it prevents the injection molded parts from falling off or deforming due to excessive ejection. This not only protects the mold body, but also greatly reduces the production defect rate of automotive injection molded parts, meeting the high precision and high consistency production requirements of automotive parts.

[0009] Furthermore, a support column is connected to the auxiliary plate, the support column abuts against the rear mold, and the support column passes through the secondary ejector plate and the main square iron.

[0010] Preferably, the lower end of the support column is firmly fixed to the auxiliary plate, and the upper end directly abuts against the rear mold, forming a complete rigid force transmission path from the base plate, bottom square iron, auxiliary plate, support column, and rear mold. This can directly bear and disperse the core load borne by the rear mold, effectively offsetting the bending deformation and local collapse risk of the rear mold, ensuring the shape and position accuracy of the rear mold cavity, and fundamentally avoiding defects such as flash, uneven wall thickness, and dimensional deviations in injection molded parts. This meets the stringent molding tolerance and appearance quality requirements of automotive parts. At the same time, the support column passes through the main square iron, which can provide full radial limit for the support column, preventing the support column from becoming unstable under pressure, and further improving its heavy load bearing capacity.

[0011] Furthermore, the auxiliary plate is connected to a sloping top, the upper end of which abuts against the inverted structure injection molded part.

[0012] Preferably, the inclined ejector is fixed to an auxiliary plate that is rigidly connected to the base plate and the bottom square iron, forming a stable and static core-pulling reference. During ejection, the telescopic drive component drives the rear mold to move the undercut structure injection molded part synchronously in the ejection direction Y. The fixed inclined ejector forms a relative core-pulling motion with the injection molded part that matches the undercut demolding direction. During the synchronous process of overall ejection, the complete core-pulling demolding of the inner side of the undercut is completed in one step without the need to set the core-pulling action sequence.

[0013] Furthermore, a straight ejector is connected to the support ejector plate, and the straight ejector abuts against the inverted structure injection molded part.

[0014] Preferably, the straight ejector is fixed to the support ejector plate that follows the ejection. During the ejection process, it moves synchronously with the rear mold and the angled ejector along the ejection direction Y. It maintains stable contact with the injection molded part throughout the process. It can directly transmit the ejection force to the rigid load-bearing areas such as the non-undercut main body surface, reinforcing ribs, and assembly pillars of the injection molded part. Together with the angled ejector for the undercut part and the rear mold that drives the whole, it forms a multi-point coordinated and full-area coverage ejection system. It completely solves the common defects in the industry such as warping deformation, local stress concentration cracking, and ejection whitening and ejection penetration caused by single-point force and uneven force in the injection molded part under the angled ejection condition. It perfectly adapts to the high-precision non-destructive demolding requirements of thin-walled large-size injection molded parts for automobiles.

[0015] Furthermore, a reset rod is connected to the support ejector plate, and the reset rod is connected to the rear mold.

[0016] Preferably, during mold closing and reset, the support ejector plate and all ejector components mounted on the plate can be driven to return precisely along the ejection direction Y, ensuring the repeatability accuracy of the endpoint position for each reset.

[0017] Furthermore, a sleeve is connected to the support ejector plate, and the upper end of the sleeve abuts against the inverted structure injection molded part.

[0018] Preferably, the ejector sleeve moves synchronously with the support ejector plate along the oblique ejection direction Y. During the ejection process, there is no relative sliding between it and the injection molded part, which will not cause scratches or damage to the post and hole wall, ensuring the smoothness and dimensional accuracy of the undercut structure and the surrounding appearance and assembly surfaces, and meeting the appearance and assembly requirements of automotive parts.

[0019] Furthermore, an ejector pin is connected to the support ejector plate, and the upper end of the ejector pin abuts against the inverted structure injection molded part.

[0020] Preferably, automotive undercut injection molded parts often have narrow and irregular areas where conventional parts cannot be placed, such as the root of the rib, the gap around the undercut, irregular grooves, thin edge corners, and small bosses. Ejector pins, with their small size and flexible specifications, can be placed in the ejection blind area to achieve ejection of the injection molded part without dead angles.

[0021] Furthermore, the telescopic drive component is a hydraulic cylinder.

[0022] Preferably, the hydraulic cylinder is a JUFAN CXHC mold-specific thin-type hydraulic cylinder or, depending on the requirements, an imported Rexroth CD70 heavy-duty hydraulic cylinder. In addition, adaptive adjustments can be made according to actual usage needs.

[0023] Furthermore, side irons are connected to both sides of the base plate.

[0024] Preferably, the side irons on both sides can evenly distribute and transfer various loads under all working conditions to the full width of the injection molding machine template, avoiding stress concentration in the core stress area in the middle of the base plate, and significantly reducing the fatigue stress of the base plate and various supporting components.

[0025] The advantages of this invention compared to the prior art are: 1. By setting the ejection direction Y at a certain angle to the mold opening direction, and using the telescopic drive component to directly drive the rear mold and the entire ejection system mounted on the support ejector plate to move synchronously along this oblique direction, the undercut structure obtains an inclined displacement when it leaves the mold cavity, thereby effectively avoiding interference. 2. It ensures that the demolding direction of the undercut structure is perfectly matched with the ejection direction, fundamentally avoiding the problems of tearing, scratching, and sticking to the undercut part during demolding of conventional direct ejection mechanisms. This significantly reduces the defect rate of injection molded parts, perfectly adapts to the high-precision molding and demolding requirements of complex deep undercut structures in automotive injection molded parts, solves the problem of demolding difficulties caused by complex part shapes, optimizes mold structure, improves product quality and production efficiency, ensures production stability, and effectively reduces costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of an inclined ejection mechanism for an automotive injection mold provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the undercut structure injection molded part in the inclined ejection mechanism of an automotive injection mold provided by an embodiment of the present invention; Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure at point AA; Figure 4 This is a top view of an inclined ejection mechanism for an automotive injection mold, provided in an embodiment of the present invention. Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure at point BB; Figure 6 for Figure 4 Schematic diagram of the cross-sectional structure at point CC; Figure 7 This is a schematic diagram of the back structure of an inclined ejection mechanism for an automotive injection mold provided in an embodiment of the present invention; Figure 8 This is a partial cross-sectional schematic diagram of an inclined ejection mechanism for an automotive injection mold provided in an embodiment of the present invention.

[0027] Explanation of reference numerals in the attached figures: 1. Base plate; 2. Bottom square iron; 3. Auxiliary plate; 4. Support ejector plate; 5. Telescopic drive component; 6. Rear mold; 7. Undercut injection molded part; 8. Main square iron; 9. Secondary ejector plate; 10. Limiting post; 11. Support post; 12. Angled ejector; 13. Straight ejector; 14. Reset rod; 15. Sleeve; 16. Ejector pin; 17. Side square iron. Detailed Implementation

[0028] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0029] See Figures 1 to 8 As shown, this invention discloses an inclined ejection mechanism for an automotive injection mold, including a base plate 1, a bottom square iron 2 fixed in the middle of the base plate 1, and side square irons 17 that can be installed on both sides of the base plate 1 to increase stability. The direction perpendicular to the base plate 1 and upward is defined as the mold opening direction Z. An auxiliary plate 3 is fixed to one side of the bottom square iron 2, and a supporting ejector plate 4 is connected to each side of the auxiliary plate 3. The installation direction of the supporting ejector plate 4 is set to be parallel to the ejection direction Y, and the ejection direction Y is inclined to one side relative to the mold opening direction Z.

[0030] A telescopic drive component 5, which serves as a power source, is mounted on the ejector plate 4. In this embodiment, a hydraulic cylinder is preferred. The output end of the hydraulic cylinder is connected to the rear mold 6 to drive its movement. The lower side (i.e., the cavity side) of the rear mold 6 is used to form the undercut injection molded part 7. A main square iron 8 is mounted above the bottom square iron 2. The main square iron 8 is positioned opposite the rear mold 6 and together they constitute the main forming part of the mold.

[0031] A secondary ejector plate 9 can also be installed on the supporting ejector plate 4, and the secondary ejector plate 9 is provided with a limiting post 10. A support post 11 can be installed on the auxiliary plate 3. The support post 11 extends upward and passes through the through holes on the secondary ejector plate 9 and the main square iron 8 in sequence, and then abuts against the bottom of the rear mold 6, playing a role in auxiliary support and guidance. In order to eject the product from different positions, an angled ejector 12 can be installed on the auxiliary plate 3, and a straight ejector 13, an ejector sleeve 15, and an ejector pin 16 can be installed on the supporting ejector plate 4. The upper ends of these ejection elements all contact the corresponding parts of the undercut structure injection molded part 7 during operation. In addition, a reset rod 14 is also installed on the supporting ejector plate 4, and the reset rod 14 is connected to the rear mold 6.

[0032] In specific implementation of this invention: During mold opening, the rear mold 6 moves along the mold opening direction Z, following the movable mold plate, and separates from the fixed mold plate, completing the mold opening action. Subsequently, the ejection stage begins: the hydraulic cylinder 5 is activated and moves upward (along the ejection direction Y). The hydraulic cylinder 5 directly pushes the rear mold 6, and simultaneously drives the entire ejection system (including the secondary ejector plate 9, inclined ejector 12, straight ejector 13, ejector sleeve 15, ejector pin 16, and return rod 14) mounted on the support ejector plate 4 and the auxiliary plate 3 to move synchronously along the inclined ejection direction Y.

[0033] During this process, the angled ejector 12, straight ejector 13, sleeve 15, and ejector pin 16 work together on the undercut injection molded part 7, causing it to gain both upward and lateral displacement. This combined motion allows the undercut structure of the injection molded part 7 to gradually and smoothly detach from the cavity of the rear mold 6, avoiding hard scraping. When the ejection system reaches the preset position, the limiting post 10 on the secondary ejector plate 9 touches the rear mold 6, and the ejection stroke stops. At this point, the angled ejector 12, straight ejector 13, sleeve 15, and ejector pin 16 have completely disengaged from the undercut injection molded part 7, and the injection molded part 7 is completely ejected from the rear mold 6, allowing it to be easily removed by a robot or operator.

[0034] After ejection is complete, hydraulic cylinder 5 moves in the reverse direction, pulling the support ejector plate 4 and the entire ejection system back to their original position along the ejection direction Y. During this process, the reset rod 14 helps ensure that the ejection element accurately returns to its initial position, preparing for the next injection cycle.

[0035] The advantages of this invention compared to the prior art are: 1. By setting the ejection direction Y at a certain angle to the mold opening direction, and using the telescopic drive component to directly drive the rear mold and the entire ejection system mounted on the support ejector plate to move synchronously along this oblique direction, the undercut structure obtains an inclined displacement when it leaves the mold cavity, thereby effectively avoiding interference. 2. It ensures that the demolding direction of the undercut structure is perfectly matched with the ejection direction, fundamentally avoiding the problems of tearing, scratching, and sticking to the undercut part during demolding of conventional direct ejection mechanisms. This significantly reduces the defect rate of injection molded parts, perfectly adapts to the high-precision molding and demolding requirements of complex deep undercut structures in automotive injection molded parts, solves the problem of demolding difficulties caused by complex part shapes, optimizes mold structure, improves product quality and production efficiency, ensures production stability, and effectively reduces costs.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An inclined ejection mechanism for an automotive injection mold, comprising a base plate (1) and a bottom square iron (2) connected to the middle of the base plate (1), characterized in that, An opening direction Z is provided perpendicular to the bottom plate (1) and an ejection direction Y is provided inclined to one side along the opening direction. An auxiliary plate (3) is connected to one side of the bottom square iron (2). Supporting ejector plates (4) are connected to both sides of the auxiliary plate (3). The supporting ejector plates (4) are set parallel to the ejection direction Y. A telescopic drive component (5) is connected to the supporting ejector plate (4). A rear mold (6) is connected to the telescopic drive component (5). An undercut structure injection molded part (7) is connected to the lower side of the rear mold (6). A main square iron (8) is connected above the bottom square iron (2). The main square iron (8) is set correspondingly to the undercut structure injection molded part (7).

2. The inclined ejection mechanism for an automotive injection mold according to claim 1, characterized in that, A secondary ejector plate (9) is connected to the support ejector plate (4), and a limiting post (10) is connected to the secondary ejector plate (9). The limiting post (10) limits the rear mold (6) when the rear mold (6) moves to the demolding position.

3. The inclined ejection mechanism for an automotive injection mold according to claim 2, characterized in that, The auxiliary plate (3) is connected to a support column (11), which abuts against the rear mold (6). The support column (11) passes through the secondary ejector plate (9) and the main square iron (8).

4. The inclined ejection mechanism for an automotive injection mold according to claim 1, characterized in that, An inclined top (12) is connected to the auxiliary plate (3), and the upper end of the inclined top (12) abuts against the inverted structure injection molded part (7).

5. The inclined ejection mechanism for an automotive injection mold according to claim 1, characterized in that, A straight pin (13) is connected to the support pin plate (4), and the straight pin (13) abuts against the inverted structure injection molded part (7).

6. The inclined ejection mechanism for an automotive injection mold according to claim 1, characterized in that, A reset rod (14) is connected to the support ejector plate (4), and the reset rod (14) is connected to the rear mold (6).

7. The inclined ejection mechanism for an automotive injection mold according to claim 1, characterized in that, The support ejector plate (4) is connected to a sleeve (15), and the upper end of the sleeve (15) abuts against the inverted structure injection molded part (7).

8. The inclined ejection mechanism for an automotive injection mold according to claim 1, characterized in that, The support ejector plate (4) is connected to an ejector pin (16), and the upper end of the ejector pin (16) abuts against the inverted structure injection molded part (7).

9. The inclined ejection mechanism for an automotive injection mold according to claim 1, characterized in that, The telescopic drive component (5) is a hydraulic cylinder.

10. The inclined ejection mechanism for an automotive injection mold according to claim 1, characterized in that, The base plate (1) is connected to side irons (17) on both sides.

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