Injection mold with ejector rod hole

Abstract

The utility model provides an injection mold with an ejector rod hole, which is applied to the field of injection molds and comprises a fixed mold unit, a movable mold unit and the ejector rod hole, the ejector rod hole is arranged on the movable mold unit and used for being matched with an ejector rod to realize product ejection, and the fixed mold unit comprises a fixed mold fixing plate, a fixed mold plate and a fixed mold core fixed on the fixed mold plate. The movable mold unit comprises a movable mold fixing plate, a base plate and a movable mold plate; a mold core is fixed to the side, close to the movable mold plate, of the base plate, a mold core groove matched with the mold core is formed in the movable mold core, an ejector pin combination plate is further connected between the movable mold fixing plate and the base plate in a sliding mode, an ejector pin is fixed to the ejector pin combination plate, and an ejector pin hole corresponding to the ejector pin is formed in the mold core. By adopting the two-section ejection design, more accurate and stable relative movement and matching between the movable mold plate and the base plate can be realized, the ejection resistance of the ejector pin is reduced, the quality of an ejected finished product is ensured, meanwhile, the injection molding machine can be used by a small machine table with a small space, and the applicability of the injection molding machine is effectively improved.

Description

Technical Field

[0001] This application relates to the field of injection molds, and in particular to an injection mold with an ejector pin hole. Background Technology

[0002] In the injection molding process, the mold plays a crucial role, determining the shape, dimensional accuracy, and ease of demolding of plastic products.

[0003] Traditional injection molds have several shortcomings in product ejection, such as inflexible ejection structures and uneven ejection force distribution, leading to product deformation and damage during demolding, thus affecting product quality and production efficiency. Furthermore, for products with complex structures, including those with side recesses or undercuts, more sophisticated mold structures are required to achieve complete and damage-free demolding. In addition, if the fit between the ejector pin and the mold is not smooth, it can cause ejection jamming and reduce the mold's lifespan and overall stability. To overcome these shortcomings of existing technologies, it is necessary to design an injection mold with an optimized structure and comprehensive functions, incorporating ejector pin holes. Utility Model Content

[0004] The purpose of this application is to improve the ejection efficiency and quality of injection molded products. Compared with the prior art, it provides an injection mold with ejector pin holes, including a fixed mold unit, a moving mold unit, and ejector pin holes on the moving mold unit for cooperating with ejector pins to achieve product ejection. The whole is used for injection molding products and can achieve smooth demolding of products by being driven by ejector pins. The fixed mold unit includes a fixed mold fixing plate, a fixed template, and a fixed mold core fixed on the fixed template. The moving mold unit includes a moving mold fixing plate, a backing plate, and a moving template. The moving mold fixing plate is fixedly connected to the backing plate. The moving template is slidably connected to one side of the backing plate. The moving template is provided with a moving mold core and a sliding mold core. The moving mold core is fixed on the side of the moving template close to the fixed template. Two sets of sliding mold cores are symmetrically slidably connected on both sides of the moving mold core. The sliding mold core is provided with two sets of guide holes. The top of the fixed template is fixed with an inclined guide post that cooperates with the guide holes. The sliding mold core, moving mold core, and fixed mold core are relatively assembled to form an injection cavity corresponding to the product.

[0005] The mold core is fixed on the side of the pad near the moving mold plate. The moving mold core is provided with a mold core groove that matches the mold core. An ejector pin assembly plate is also slidably connected between the moving mold fixing plate and the pad. An ejector pin is fixed on the ejector pin assembly plate. An ejector pin is provided in the mold core. An ejector pin hole corresponding to the ejector pin is provided in the mold core.

[0006] The ejector pin holes are set on the moving mold fixing plate, and the number of ejector pin holes is multiple and equidistantly arranged. The ejector pin assembly plate is fixed with a buffer pad corresponding to the ejector pin hole on the side close to the moving mold fixing plate. Synchronous push rods are also fixed on both sides of the ejector pin assembly plate. The synchronous push rods are used to drive the moving mold plate to move synchronously during the demolding process.

[0007] Furthermore, guide blocks are symmetrically fixed on both sides of the pad, and the guide blocks are provided with through slots for the synchronous push rod to pass through. Telescopic blocks are symmetrically provided on both sides of the moving template, and the telescopic blocks are slidably connected to the moving template through a limiting slide rod and a return spring.

[0008] Furthermore, the limiting slide rod has an elastic force that drives the telescopic block away from the moving template, the telescopic block has a first bevel on the side away from the synchronous push rod, and the top of the guide block has a second bevel that matches the first bevel.

[0009] Furthermore, the moving mold fixing plate is also fixed with several support heads for supporting the pad plate, and the ejector pin assembly plate is provided with a sliding sleeve that matches the support head.

[0010] Furthermore, the inner wall of the top roller hole is precision machined to a surface roughness Ra value of less than or equal to 1.6 μm, in order to reduce the friction of the top roller during movement, improve the smoothness of the ejection action and the service life of the top roller.

[0011] Compared to existing technologies, the advantages of this application are:

[0012] This application, through the cooperation of the sliding mold core and the inclined guide pillar, solves the demolding problem of complex structures such as upper concave and undercut surfaces on products. It avoids deformation and damage to the product due to forced pulling during demolding, effectively improving the quality and integrity of the product after demolding and reducing the scrap rate. The reasonable design of the ejector pin hole and its coordinated cooperation with components such as the ejector pin assembly plate and buffer pad, along with the two-stage ejection design, helps to achieve more precise and stable relative movement and cooperation between the moving platen and the backing plate. This reduces the resistance during ejection, ensures the quality of the ejected product, and makes the ejection power transmission more uniform and smooth. It also reduces friction and impact during the ejection process, which not only improves ejection efficiency but also extends the service life of related components of the mold ejection system, reduces production interruptions caused by ejection failures, and improves production efficiency. At the same time, it meets the needs of small machines with limited space, effectively improving the applicability of injection molding machines. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this application;

[0014] Figure 2 This is a schematic diagram of the bottom structure of this application;

[0015] Figure 3 This is a schematic diagram of a partial explosion structure in this application;

[0016] Figure 4 This is a schematic diagram of the structure of the moving mold core and its components proposed in this application;

[0017] Figure 5 This is a frontal exploded view of the dynamic model unit proposed in this application;

[0018] Figure 6 This is a schematic diagram of the exploded bottom structure of the moving model unit proposed in this application;

[0019] Figure 7 This is an exploded structural diagram of the guide block and telescopic block proposed in this application.

[0020] Explanation of the labels in the diagram:

[0021] 1. Fixed mold plate; 11. Fixed mold core; 12. Inclined guide post; 2. Moving mold plate; 21. Moving mold core; 211. Mold core groove; 22. Telescopic block; 221. First bevel; 24. Limiting slide rod; 25. Return spring; 3. Fixed mold fixing plate; 4. Moving mold fixing plate; 41. Ejector pin hole; 42. Support head; 5. Ejector pin assembly plate; 51. Buffer pad; 52. Synchronous push rod; 53. Sliding sleeve; 6. Sliding mold core; 61. Guide hole; 7. Product; 8. Ejector pin; 9. Pad plate; 91. Guide block; 911. Second bevel; 912. Through groove; 92. Mold core. Detailed Implementation

[0022] The embodiments will be described clearly and completely with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application. Example

[0023] This utility model provides an injection mold with an ejector pin hole. Please refer to [link / reference]. Figure 1 - Figure 7 It mainly consists of a fixed mold unit, a moving mold unit, and an ejector pin hole 41 set on the moving mold unit. The various parts cooperate to realize the injection molding of the product 7 and the smooth demolding of the product.

[0024] Specifically, the fixed mold unit includes a fixed mold fixing plate 3, a fixed template 1, and a fixed mold core 11 fixed on the fixed template 1.

[0025] The fixed mold plate 3 is the basic support component of the fixed mold unit. It is made of metal material with sufficient strength and rigidity. Its main function is to firmly install the entire fixed mold part in the fixed position of the injection molding machine, ensuring that the fixed mold will not be displaced or shaken during the injection molding process, and providing a stable foundation for subsequent injection molding operations.

[0026] The fixed template 1 provides an installation base for the fixed mold core 11. One side of the template is equipped with an installation structure that is compatible with the fixed mold core 11, ensuring that the fixed mold core 11 can be accurately positioned and fixed on it. On the other hand, the fixed template 1 also participates in the overall mold opening and closing action of the mold, and cooperates with the corresponding template of the moving mold unit to realize the mold closing to form a cavity and the mold opening to perform demolding operations.

[0027] The fixed mold core 11 is made of mold steel material that is wear-resistant, has good thermal stability and high machining accuracy. Its shape is designed according to the outer contour and internal structural features of the product 7 to be injected. After it is aligned with the moving mold core 21 and the sliding mold core 6 in the moving mold unit, it can accurately form an injection cavity corresponding to the product 7, thereby defining the external shape and size of the product 7. During the injection process, the plastic melt cools and solidifies in this cavity.

[0028] The moving mold unit includes a moving mold fixing plate 4, a pad plate 9, and a moving mold plate 2. All components work together and play a key role in the injection molding and demolding process.

[0029] The moving mold fixing plate 4 is connected to the moving mold mounting part of the injection molding machine and serves as the fixed foundation for the entire moving mold unit. It bears the clamping force, ejection force, and other forces from the injection molding machine. The moving mold fixing plate 4 is provided with multiple ejector pin holes 41 arranged at equal intervals. The diameter, number, and distribution of these ejector pin holes 41 are precisely designed according to the ejection requirements, so that the ejector pins can pass through the ejector pin holes 41 and contact the ejector pin assembly plate 5 inside the moving mold unit, providing stable and uniform power for product ejection and ensuring that the product 7 can be smoothly ejected from the cavity.

[0030] The base plate 9 is fixedly connected to the moving mold fixing plate 4, providing a stable support platform for the moving mold plate 2 and other related components above. Simultaneously, a mold core 92 is fixed to the side of the base plate 9 closest to the moving mold plate 2. The mold core 92 participates in the molding process of the internal structure of the product 7 and matches the mold core groove 211 on the moving mold core 21. This cooperation further improves the structure of the injection cavity, enabling the accurate molding of the internal shape of the product 7. Furthermore, guide blocks 91 are symmetrically fixed to both sides of the base plate 9. The guide blocks 91 have through grooves 912 for the synchronous push rod 52 to pass through, providing guidance and limiting for the synchronous displacement of the moving mold plate 2 during demolding.

[0031] The moving mold plate 2 is slidably connected to one side of the base plate 9 and can move relative to the base plate 9. This movement enables actions such as mold opening, mold closing, and product ejection. The moving mold plate 2 is provided with a moving mold core 21 and a sliding mold core 6. The moving mold core 21 is fixed on the side of the moving mold plate 2 near the fixed mold plate 1 and together with the fixed mold core 11, it forms the main cavity of the product 7, determining the main shape of the product 7. Two sets of sliding mold cores 6 are symmetrically slidably connected to both sides of the moving mold core 21. The sliding mold core 6 is provided with two sets of guide holes 61. By cooperating with the inclined guide post 12 fixed on the top of the fixed mold plate 1, during the mold opening process, the inclined guide post 12 slides along the guide holes 61, which can drive the sliding mold core 6 to slide laterally on both sides of the moving mold core 21. This enables the demolding operation of parts of the product 7 with side recesses or undercut structures, and prevents the product 7 from being damaged due to these special structures getting stuck during demolding.

[0032] In addition, telescopic blocks 22 are symmetrically arranged on both sides of the moving mold plate 2. The telescopic blocks 22 are slidably connected to the moving mold plate 2 via limiting slide rods 24 and return springs 25. The limiting slide rods 24 have an elastic force to drive the telescopic blocks 22 away from the moving mold plate 2. The side of the telescopic blocks 22 away from the synchronous push rod 52 is provided with a first bevel 221. The top of the guide block 91 is provided with a second bevel 911 that matches the first bevel 221. During the demolding process, the synchronous push rod 52 abuts against the telescopic blocks 22 in advance, thereby driving the ejector pin assembly plate 5 and the moving mold plate 2 to move synchronously, so that the ejector pin 8 remains relatively stationary with the moving mold core 21. At this time, the use of The movement of the moving template 2 away from the mold core 92 detaches the product 7 from the mold core 92. When the moving template 2 is in position, the second bevel 911 presses against the first bevel 221, causing the telescopic block 22 to retract. The synchronous push rod 52 has a larger stroke in the through groove 912. At this time, the continuous displacement of the ejector plate 5 drives the ejector pin 8 to move relative to the moving mold core 21, ejecting the product 7 ejected by the moving mold core 21 again, thus achieving material removal. The two-stage ejection design helps to achieve more precise and stable relative movement and cooperation between the moving template 2 and the backing plate 9, reduces the resistance when the ejector pin 8 ejects, and ensures the quality of the ejected product 7.

[0033] The ejector plate 5 is slidably connected between the moving mold fixing plate 4 and the pad plate 9. On one hand, an ejector pin 8 is fixed thereon. One end of the ejector pin 8 passes through the corresponding ejector pin hole in the mold core 92 and contacts the product 7. During ejection, the ejector pin 8 applies an upward ejection force to the product 7, ejecting the product 7 from the cavity. On the other hand, a buffer pad 51 corresponding to the ejector pin hole 41 is fixed on the side of the ejector plate 5 near the moving mold fixing plate 4. The buffer pad 51 can play a buffering role when the ejector pin transmits the ejection force, reducing the impact force on the ejector plate 5 and the entire ejection system, and ensuring the smoothness of the ejection action.

[0034] In addition, synchronous push rods 52 are fixed on both sides of the ejector plate 5. During the demolding process, the synchronous push rods 52 drive the moving plate 2 to move synchronously, ensuring that the moving plate 2, ejector plate 5 and other components move in a coordinated manner, and avoiding the situation where the product 7 is not demolded smoothly or the mold components are damaged due to uncoordinated movement.

[0035] The ejector pin hole 41 is located on the moving mold fixing plate 4. Its inner wall is precision machined, and the surface roughness Ra value is less than or equal to 1.6μm. This precision machining can effectively reduce the friction of the ejector pin during the movement, making the ejector pin smoother when it passes through the ejector pin hole 41 and contacts the ejector pin assembly plate 5 to transmit the ejection force. This not only improves the efficiency and stability of the ejection action, but also extends the service life of the ejector pin and reduces the maintenance costs and potential failure risks caused by friction and wear.

[0036] The support head 42 is fixed on the moving mold fixing plate 4. Several support heads 42 are evenly distributed to support the pad plate 9, share the pressure borne by the pad plate 9, prevent the pad plate 9 from deforming due to excessive force during long-term use, ensure the relative position accuracy between the components of the moving mold unit and the stability of the entire mold structure, and thus ensure that injection molding and demolding operations can be carried out stably for a long time.

[0037] The sliding sleeve 53 is set on the ejector assembly plate 5 and matches the support head 42. The sliding sleeve 53 can provide a smoother guiding effect for the sliding movement of the ejector assembly plate 5, reduce frictional resistance and deflection during the sliding process, and further improve the reliability of the ejection system and the accuracy of the ejection action.

[0038] The working process of this injection mold is mainly divided into the following stages:

[0039] 1. Mold Closing Stage

[0040] The injection molding machine drives the moving mold unit to move towards the fixed mold unit. The moving mold plate 2 gradually approaches the fixed mold plate 1, and finally the two close together. At this time, the moving mold core 21, the fixed mold core 11, and the sliding mold core 6 precisely cooperate to form a complete injection cavity. The inclined guide post 12 is inserted into the guide hole 61 of the sliding mold core 6 to ensure the lateral positioning of the sliding mold core 6.

[0041] 2. Injection Molding Stage

[0042] The molten plastic is injected into the sprue of the fixed mold unit through the injection nozzle of the injection molding machine. This is not described in detail in the given content, but it is a necessary structure of conventional injection molds. It is connected to the fixed mold to introduce the molten plastic. The molten plastic enters the injection cavity formed by the moving and fixed mold cores along the flow channel. It gradually cools and solidifies in the cavity to form the shape of product 7.

[0043] 3. Mold making stage

[0044] After injection molding is completed, the injection molding machine drives the moving mold unit to separate from the fixed mold unit and begins the mold opening action. First, the moving mold plate 2 moves backward together with the moving mold fixing plate 4. During this process, the inclined guide post 12 slides relative to the guide hole 61 of the slide mold core 6. Due to the inclined structure of the inclined guide post 12, it applies a lateral force to the slide mold core 6, driving the slide mold core 6 to slide outward on both sides of the moving mold core 21, so that the parts of the product 7 with side recesses or undercut structures are first dislodged from the cavity, avoiding interference with the subsequent ejection action. At the same time, under the action of the limiting slide rod 24 and the return spring 25, the telescopic block 22 cooperates with the guide block 91 through the first bevel 221 and the second bevel 911 to ensure that the moving mold plate 2 slides smoothly relative to the pad plate 9.

[0045] 4. Top-out stage

[0046] After the mold is opened to a certain extent, the ejector device of the injection molding machine drives the ejector roller to pass through the ejector roller hole 41 on the moving mold fixing plate 4. The ejector roller contacts the buffer pad 51 on the ejector pin assembly plate 5 and transmits the ejection force. Under the action of the ejection force, the ejector pin assembly plate 5 slides upward, driving the ejector pin 8 fixed on it to move upward synchronously. The ejector pin 8 applies an ejection force to the product 7, completely ejecting the product 7 from the cavity. During this process, the synchronous push rod 52 moves with the ejector pin assembly plate 5, and through the cooperation with the through groove 912 on the guide block 91, drives the moving mold plate 2 to move synchronously, so that the mold core 92 simultaneously disengages from the mold core groove 211, ensuring that all components work together in the entire demolding process and ensuring that the product 7 is demolded smoothly.

[0047] 5. Reset Phase

[0048] After product 7 is demolded, the ejector device of the injection molding machine drives the ejector roller to retract and reset. The ejector pin assembly plate 5 returns to its initial position under its own weight and possible reset mechanisms such as reset springs, depending on the actual situation. The ejector pin 8 then resets accordingly. At the same time, the sliding mold core 6 slides inward and resets under the action of the corresponding reset device such as a spring. The moving mold plate 2 also restores its relative position to the backing plate 9 before mold closing through structures such as the telescopic block 22, preparing for the next injection molding.

[0049] This application, through the cooperation of the sliding mold core 6 and the inclined guide pillar 12, can solve the demolding problem of complex structures such as the upper concave and undercut of the product 7, avoiding deformation and damage caused by forced pulling during demolding, effectively improving the quality and integrity of the product after demolding and reducing the scrap rate. The reasonable design of the ejector hole 41 and its coordinated cooperation with components such as the ejector pin assembly plate 5 and the buffer pad 51 make the ejection power transmission more uniform and smooth, reducing the friction and impact during the ejection process. This not only improves the ejection efficiency but also extends the service life of related components of the mold ejection system, reduces production interruptions caused by ejection failures, improves production efficiency, and meets the needs of small machines with limited space, effectively improving the applicability of injection molding machines.

[0050] Meanwhile, in this application, the supporting role of the support head 42 on the pad plate 9, the guiding and limiting role of the structure such as the guide block 91 and the telescopic block 22 on the movement of the moving template 2, and the auxiliary role of the sliding sleeve 53 on the sliding of the ejector pin assembly plate 5, together ensure the structural stability of the mold in the entire working process of mold opening and closing, injection molding and ejection, reduce the wear and displacement deviation between parts, and enable the mold to operate stably for a long time, reducing maintenance costs and repair frequency.

[0051] The above description is merely the best implementation method adopted in light of current practical needs, but the scope of protection of this application is not limited thereto.

Claims

1. An injection mold with an ejector pin hole, comprising a fixed mold unit, a moving mold unit, and an ejector pin hole (41) disposed on the moving mold unit for cooperating with an ejector pin to eject the product, the whole being used for injection molding of a product (7) and capable of smoothly demolding the product (7) by being driven by the ejector pin, characterized in that, The fixed mold unit includes a fixed mold fixing plate (3), a fixed template (1) and a fixed mold core (11) fixed on the fixed template (1). The moving mold unit includes a moving mold fixing plate (4), a pad (9) and a moving template (2). The moving mold fixing plate (4) is fixedly connected to the pad (9). The moving template (2) is slidably connected to one side of the pad (9). The moving template (2) is provided with a moving mold core (21) and a sliding mold core (6). The moving mold core (21) is fixed on the side of the moving template (2) close to the fixed template (1). Two sets of sliding mold cores (6) are symmetrically slidably connected on both sides of the moving mold core (21). The sliding mold core (6) is provided with two sets of guide holes (61). The top of the fixed template (1) is fixed with an inclined guide post (12) that cooperates with the guide hole (61). The sliding mold core (6), the moving mold core (21) and the fixed mold core (11) are relatively combined to form an injection cavity corresponding to the product (7). The pad (9) is fixed with a mold core (92) on the side near the moving mold plate (2). The moving mold core (21) is provided with a mold core groove (211) that matches the mold core (92). The moving mold fixing plate (4) and the pad (9) are also slidably connected with an ejector pin assembly plate (5). The ejector pin assembly plate (5) is fixed with an ejector pin (8). The mold core (92) is provided with an ejector pin hole corresponding to the ejector pin (8). The ejector pin hole (41) is set on the moving mold fixing plate (4). The number of ejector pin holes (41) is a plurality of them arranged at equal intervals. The ejector pin assembly plate (5) is fixed with a buffer pad (51) corresponding to the ejector pin hole (41) on one side near the moving mold fixing plate (4). Synchronous push rods (52) are also fixed on both sides of the ejector pin assembly plate (5). The synchronous push rods (52) are used to drive the moving mold plate (2) to move synchronously during the demolding process.

2. The injection mold with an ejector pin hole according to claim 1, characterized in that, Guide blocks (91) are symmetrically fixed on both sides of the pad (9). The guide blocks (91) are provided with through slots (912) for the synchronous push rod (52) to pass through. Telescopic blocks (22) are symmetrically provided on both sides of the moving template (2). The telescopic blocks (22) are slidably connected to the moving template (2) through the limiting slide rod (24) and the reset spring (25).

3. The injection mold with an ejector pin hole according to claim 2, characterized in that, The limiting slide bar (24) has an elastic force that drives the telescopic block (22) away from the moving template (2). The telescopic block (22) is provided with a first bevel (221) on the side away from the synchronous push rod (52). The top of the guide block (91) is provided with a second bevel (911) that matches the first bevel (221).

4. The injection mold with an ejector pin hole according to claim 1, characterized in that, The moving mold fixing plate (4) is also fixed with a number of support heads (42) for supporting the pad plate (9), and the ejector pin assembly plate (5) is provided with a sliding sleeve (53) that matches the support head (42).

5. An injection mold with an ejector pin hole according to claim 1, characterized in that, The inner wall of the top roller hole (41) is precision machined, with a surface roughness Ra value of less than or equal to 1.6 μm, in order to reduce the friction of the top roller during the movement, improve the smoothness of the ejection action and the service life of the top roller.

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