mold

Abstract

The present application provides a mold, belongs to the technical field of mold. It solves the problem of complex structure. It includes fixed mold, movable mold, slider which can slide out of movable mold, and core rod which is set obliquely relative to the sliding direction of slider, the fixed mold is fixed with inclined guide column, the slider is provided with inclined guide slot for the inclined guide column to pass through, the slider is provided with through hole, the core rod is arranged in the through hole, one end of the core rod abuts against the fixed mold and the other end of the core rod extends out of the through hole into the cavity, the through hole is further provided with top pressure spring which acts on the core rod in the direction away from the cavity, the left side wall of the inclined guide slot and the left side wall of the inclined guide column have delay gap for the inclined guide column to move in the inclined guide slot in the opening direction for a distance when opening the mold, and the gap between the slider and the fixed mold is continuously increased and the core rod can move in the direction away from the cavity during the movement of the inclined guide column in the inclined guide slot in the opening direction. It has the advantages of simple structure, high reliability and the like.

Description

Technical Field

[0001] This invention belongs to the field of mold technology and relates to molds. Background Technology

[0002] Injection molds are the most commonly used molding molds in the production of thermoplastic parts. The more complex the product, the more complex the mold structure. For example, when the product shape is very regular, the mold usually consists of only a fixed mold and a moving mold. However, if the product also requires a side concave structure perpendicular to the opening and closing direction of the fixed mold and the moving mold, the fixed mold and the moving mold alone cannot achieve normal product demolding. In this case, a slider needs to be slidably connected to the moving mold along the direction perpendicular to its opening and closing direction with the fixed mold. The moving mold, the fixed mold, and the slider together form a cavity when the mold is closed. Then, when the product is demolded, the slider slides along the moving mold to eliminate the obstruction to demolding. This is called side core pulling in the mold industry.

[0003] Traditional side-pulling methods typically involve setting an inclined guide post on the fixed mold, tilted relative to the opening and closing direction of the moving mold, and setting an inclined guide groove on the slider for the inclined guide post to pass through the moving mold. When the moving mold and the fixed mold separate, the groove wall moves along the inclined guide post, generating a driving force on the slider, thereby driving the slider to move automatically out of the moving mold. Furthermore, when it is required that the molded product also has a hole that is tilted relative to the above-mentioned side concave structure, a core rod is usually set on the moving mold or the fixed mold. When the mold is closed, one end of the core rod extends into the cavity to make the molded product have a hole. When the mold is opened, the core rod is pulled out separately. For this purpose, a core-pulling mechanism specifically for the core rod needs to be set on the moving mold or the fixed mold. However, the setting of multiple core-pulling mechanisms will make the overall structure of the mold more complex. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned problems in the existing technology by proposing a mold that solves the problem of complex mold structure.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A mold includes a fixed mold, a moving mold, a slider connected to the moving mold and capable of sliding to the left out of the moving mold, and a core rod inclined relative to the sliding direction of the slider. The fixed mold, the moving mold, and the slider form a cavity. An inclined guide post is fixed on the fixed mold, and an inclined guide groove is provided on the slider for the inclined guide post to pass through. The slider is characterized by having a through hole, with the core rod disposed in the through hole. One end of the core rod abuts against the fixed mold, and the other end extends out of the through hole into the cavity. A top pressure spring acting on the core rod in a direction away from the cavity is also provided in the through hole. There is a time delay gap between the left side wall of the inclined guide groove and the left side wall of the inclined guide post, allowing the inclined guide post to move a certain distance in the inclined guide groove along the mold opening direction when the mold is opened. During the process of the inclined guide post moving a certain distance in the inclined guide groove along the mold opening direction, a gap that continuously increases between the slider and the fixed mold is formed, allowing the core rod to move in a direction away from the cavity.

[0007] In the closed mold state, a cavity is formed between the moving mold, the fixed mold, and the slide block. One end of the mandrel abuts against the fixed mold, and the other end extends into the cavity through a through hole. Molten plastic is injected into the cavity, forming a product with the same shape as the cavity. The presence of the mandrel ensures that the formed product has the required holes directly on it.

[0008] After the product is formed, the mold is opened. First, the moving mold separates from the fixed mold (actually, the fixed mold remains stationary, and the moving mold separates from the fixed mold under the action of the corresponding driving structure). Because there is a delay gap between the left side wall of the inclined guide groove and the left side wall of the inclined guide post, allowing the inclined guide post to move a certain distance in the mold opening direction within the inclined guide groove, the slider only moves in the same direction as the moving mold when the moving mold first starts to move, but does not slide to the left. Only when the moving mold moves to the left side wall of the inclined guide groove and abuts against the left side wall of the inclined guide post to eliminate the delay gap, will the slider begin to slide to the left through the movement of the moving mold. In other words, the slider in this application opens with a delay, and the delay time is the time from when the moving mold first moves to when it moves to the left side wall of the inclined guide groove and abuts against the left side wall of the inclined guide post. Furthermore, since a top pressure spring is also provided in the through hole to act on the core rod in the direction away from the cavity, and during the process of the inclined guide post moving a certain distance in the inclined guide groove along the mold opening direction, a gap that continuously increases between the slider and the fixed mold is formed, allowing the core rod to move in the direction away from the cavity, so that during the time when the slider is delayed in opening, the core rod can continuously move in the direction away from the cavity under the action of the top pressure spring as the moving mold separates from the fixed mold, thereby automatically completing the separation of the core rod from the product.

[0009] This mold simplifies the overall structure by placing the core rod used to form holes in the product into the through hole of the slider and setting a top pressure spring in the through hole that acts on the core rod in the direction away from the cavity. At the same time, a delay gap is set between the left side wall of the inclined guide groove and the left side wall of the inclined guide post. This allows the core rod to be automatically pulled out directly by setting the slider to open after a delay, in conjunction with the top pressure spring, while the holes are formed normally on the product. This eliminates the need for a separate core pulling mechanism.

[0010] In the above-mentioned mold, the upper end of the inclined guide post is fixedly connected to a vertically arranged straight guide post. The straight guide post is fixed to the fixed mold. The slider has a top straight surface that abuts against the right side wall of the straight guide post. When the left side wall of the inclined guide groove abuts against the left side wall of the inclined guide post, the top straight surface is located below the straight guide post.

[0011] When the moving mold begins to move, the time-delay gap between the left wall of the inclined guide groove and the left wall of the inclined guide post gradually decreases as the moving mold moves. However, this also causes a gap to appear between the right wall of the inclined guide groove and the right wall of the inclined guide post. In particular, there may be a situation where the time-delay gap between the left wall of the inclined guide groove and the left wall of the inclined guide post is not completely eliminated, and there is also a gap between the right wall of the inclined guide groove and the right wall of the inclined guide post. In this state, the slider can move left and right, which may cause the automatic core-pulling action of the core rod and the core-pulling action of the slider to become disordered, or even damage the formed hole. To address this, a vertically set straight guide post is fixed to the upper end of the inclined guide post, and a top abutting surface is provided on the slider that abuts against the right wall of the straight guide post. During the process of the moving mold moving to eliminate the time-delay gap, the abutting surface abutting against the right wall of the straight guide post keeps the slider stationary. This allows the mold to strictly follow the action of first automatically pulling the core rod and then sliding the slider, thus simplifying the mold structure while ensuring reliability.

[0012] In the aforementioned mold, the slider also has a guide surface parallel to the right side wall of the inclined guide groove. The lower end of the guide surface is connected to the upper end of the top straight surface. When the moving mold and the fixed mold are closed, the inclined guide post moves along the guide surface and pushes the slider to reset.

[0013] With the above settings, when the moving mold and the fixed mold are closed, the inclined guide post can move along the guide surface and push the slider to reset, which simplifies the structure of this mold while ensuring normal mold closing.

[0014] In the aforementioned mold, the slider includes a body and a top pressing block fixed to the body by fasteners. The body has a straight guide groove that communicates with the upper end slot of the inclined guide groove and a positioning groove that communicates with the right side of the straight guide groove. The top pressing block is fixed in the positioning groove and both the top straight surface and the guide surface are located on the top pressing block.

[0015] The slider is designed as a separate structure including the body and the top pressure block. This allows the wear of the top pressure block to replace the wear of the body. The top pressure block is readily available to the staff and can be replaced regularly, thus ensuring the positioning effect of the slider during the delayed opening process and ensuring the stability of the core rod pulling process.

[0016] In the aforementioned mold, the inclined guide post and the straight guide post are integrally fixed together, and the hardness of the straight guide post is greater than that of the top pressure block.

[0017] The hardness of the straight guide post is set to be greater than that of the top pressure block so that the wear caused by the relative movement of the two is borne by the top pressure block. This also avoids wear between the inclined guide post and the straight guide post, and ensures the fitting accuracy with the slider.

[0018] In the aforementioned mold, the through hole is a stepped hole, and the core rod includes a head located within the larger portion of the through hole and a rod portion passing through the smaller portion of the through hole. The top pressure spring is sleeved on the rod portion located within the larger portion of the through hole, and its two ends abut against the head and the stepped surface inside the through hole, respectively.

[0019] The core rod is mainly used to make the molded product have the required holes. The top pressure spring is sleeved on the outside of the rod located in the larger part of the through hole, and its two ends abut against the head of the core rod and the stepped surface in the through hole, respectively. This makes the elastic force of the top pressure spring act on the top rod in the direction that moves the core rod away from the cavity. In this way, the core rod and the product can be automatically separated by the top pressure spring during the time when the moving mold moves to eliminate the delay gap. This allows the mold to achieve automatic core pulling without using a core pulling mechanism, simplifying the structure.

[0020] In the aforementioned mold, the fixed mold has a groove, the slider has an upwardly protruding part located in the groove, a through hole is located on the protruding part, the groove has a mating surface perpendicular to the core rod, the head of the core rod rests against the mating surface, the protruding part has a side surface parallel to the mating surface, and a portion of the through hole with a larger size penetrates through this side surface.

[0021] The protrusion allows the slider to have a through-hole for integrating the core rod. Simultaneously, a mating surface perpendicular to the core rod's axis is provided within the groove, and the core rod's head is positioned to rest against this mating surface. This allows the mating surface to generate a pushing force on the core rod during mold closing, compressing the ejector spring and achieving reset. The protrusion has a side parallel to the mating surface, with a larger through-hole extending through this side. Since the core rod is inclined relative to the slider's sliding direction, and the mating surface is perpendicular to the core rod, a gap is created between the mating surface and this side during the slider's delayed opening period. This gap gradually increases as the delay gap diminishes. Consequently, the core rod can move continuously away from the cavity under the action of the ejector spring, automatically completing the core pulling process.

[0022] Compared with existing technologies, this mold sets the core rod used to form holes on the product onto the slider and sets a top pressure spring inside the slider that acts on the core rod in the direction away from the cavity. At the same time, it combines a delay gap between the left side wall of the inclined guide groove and the left side wall of the inclined guide post. This allows the core rod to be automatically pulled out directly by setting the slider to open after a delay, in conjunction with the top pressure spring, while the holes are formed on the product normally. This eliminates the need for a separate core pulling mechanism and greatly simplifies the overall structure of the mold. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the mold structure.

[0024] Figure 2 This is an exploded view of the mold.

[0025] Figure 3 This is an exploded view of the mold from another angle.

[0026] Figure 4 This is a plan view of the mold.

[0027] Figure 5 yes Figure 4 Sectional view along the AA direction.

[0028] Figure 6 yes Figure 5 A magnified view of the middle slider area.

[0029] Figure 7 This is a sectional view of the mold when the moving mold and the fixed mold are separated to the inclined guide groove, away from the cavity, and the groove wall abuts against the working section (the sectional view direction is the same as the previous one). Figure 5 same).

[0030] In the diagram, 1. Fixed mold; 1a. Groove; 1a1. Mating surface; 2. Moving mold; 2a. Slide groove; 3. Slider; 3a. Body; 3a1. Angled guide groove; 3a2. Straight guide groove; 3a3. Positioning groove; 3a4. Protrusion; 3a5. Through hole; 3b. Top pressure block; 3b1. Top straight surface; 3b2. Guide surface; 4. Cavity; 5. Pressure block; 6. Core rod; 6a. Head; 6b. Rod part; 7. Top pressure spring; 8. Angled guide post; 9. Delay gap; 10. Straight guide post; 11. Support spring; 12. Limiting block. Detailed Implementation

[0031] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0032] like Figures 1-6As shown, the mold includes a fixed mold 1, a movable mold 2 located below the fixed mold 1, and a slider 3 connected to the movable mold 2 and capable of sliding out of the movable mold 2 to the left. The slider 3 and the movable mold 2 are fixed along the mold opening direction of the movable mold 2 and the fixed mold 1. The right ends of the movable mold 2, the fixed mold 1, and the slider 3 form a cavity 4 when the mold is closed. Specifically, the movable mold 2 has a groove 2a that is recessed away from the fixed mold 1 and penetrates one side wall of the movable mold 2. Pressure blocks 5 are fixed on both sides of the slider 3 on the movable mold 2. The slider 3 has steps that correspond one-to-one with the two pressure blocks 5. The two pressure blocks 5 partially abut against the corresponding steps, so that the slider 3 and the movable mold 2 are fixed along the mold opening direction of the movable mold 2 and the fixed mold 1. Furthermore, the mold also includes a core rod 6, which is inclined relative to the sliding direction of the slider 3. The slider 3 is provided with a through hole 3a5, and the core rod 6 is located in the through hole 3a5. One end of the core rod 6 abuts against the fixed mold 1, and the other end extends out of the through hole 3a5 into the cavity 4. A top pressure spring 7 is also provided in the through hole 3a5, which acts on the core rod 6 in a direction away from the cavity 4. Specifically, the through hole 3a5 is a stepped hole, and the core rod 6 includes a head 6a located in the larger part of the through hole 3a5 and a rod part 6b passing through the smaller part of the through hole 3a5. The top pressure spring 7 is sleeved on the rod part 6b located in the larger part of the through hole 3a5, and its two ends abut against the head 6a and the stepped surface in the through hole 3a5, respectively. The fixed mold 1 has a groove 1a, the slider 3 has a protrusion 3a4 that protrudes upward and is located in the groove 1a, the through hole 3a5 is located on the protrusion 3a4, the groove 1a has a mating surface 1a1 that is perpendicular to the axis of the core rod 6, the head 6a of the core rod 6 abuts against the mating surface 1a1, the protrusion 3a4 has a side surface that is parallel to the mating surface 1a1, and the larger part of the through hole 3a5 passes through this side surface.

[0033] Furthermore, such as Figure 2 , Figure 3 , Figure 5 and Figure 6As shown, the fixed mold 1 is provided with an inclined guide post 8, and the slider 3 is provided with an inclined guide groove 3a1 for the inclined guide post 8 to pass through into the moving mold 2. The moving mold 2 has a clearance groove for the inclined guide post 8 to move in the left and right directions. There is a delay gap 9 between the left side wall of the inclined guide groove 3a1 and the left side wall of the inclined guide post 8, which allows the inclined guide post 8 to move a certain distance in the inclined guide groove 3a1 in the mold opening direction when the mold is opened. During the process of the inclined guide post 8 moving a certain distance in the inclined guide groove 3a1 in the mold opening direction, a gap that continuously increases is formed between the slider 3 and the fixed mold 1, which allows the core rod 8 to move away from the cavity 4. The upper end of the inclined guide post 8 is fixedly connected to a vertically arranged straight guide post 10. The straight guide post 10 is fixed to the fixed mold 1. The slider 3 has a top abutting straight surface 3b1 that abuts against the right side wall of the straight guide post 10. When the left side wall of the inclined guide groove 3a1 abuts against the left side wall of the inclined guide post 8, the top abutting straight surface 3b1 is located below the straight guide post 10. The slider 3 also has a guide surface 3b2 that is parallel to the right side wall of the inclined guide groove 3a1. The lower end of the guide surface 3b2 is connected to the upper end of the top straight surface 3b1. When the moving mold 2 and the fixed mold 1 are closed, the inclined guide post 8 moves along the guide surface 3b2 and pushes the slider 3 to reset.

[0034] In this embodiment, as Figure 2 , Figure 5 and Figure 6 As shown, the slider 3 includes a body 3a and a top pressure block 3b fixed to the body 3a by fasteners. The inclined guide groove 3a1 and the protrusion 3a4 are both located on the body 3a. The body 3a has a straight guide groove 3a2 communicating with the upper opening of the inclined guide groove 3a1 and a positioning groove 3a3 communicating with the right side of the straight guide groove 3a2. The top pressure block 3b is fixed inside the positioning groove 3a3, and its abutting surface 3b1 and guide surface 3b2 are both located on the top pressure block 3b. The inclined guide post 8 and the straight guide post 10 are integrally fixed together, and the hardness of the straight guide post 10 is greater than that of the top pressure block 3b. In practice, there are two inclined guide posts 8 arranged in parallel. A support spring 10 is also provided between the slider 3 and the moving mold 2. A limit block 12 is fixed outside the moving mold 2. The top pressure block 3b also prevents the slider 3 from moving to the left under the action of the support spring 10. When the inclined guide post 8 is separated from the inclined guide groove 3a1, the slider 3 abuts against the limit block 12 and the support spring 10 is in a compressed state. This can position the slider 3 after core pulling to avoid displacement, thereby ensuring that the inclined guide post 8 can move along the guide surface 3b1 when the mold is closed next time.

[0035] In the mold closed state, such as Figure 5 and Figure 6As shown, a cavity 4 is formed between the moving mold 2, the fixed mold 1, and the slider 3. The protrusion 3a4 on the slider 3 is embedded in the groove 1a of the fixed mold 1. The mating surface 1a1 presses against the head 6a of the core rod 6, causing the rod portion 6b of the core rod 6 to overcome the elastic force of the top pressure spring 7 and extend into the cavity 4. The top pressure surface 3b1 on the top pressure block 3b abuts against the right side wall of the straight guide post 10, and there is a delay gap 9 between the left side wall of the inclined guide groove 3a1 and the left side wall of the inclined guide post 8. Molten plastic is injected into the cavity 4 to form a product with the same shape as the cavity 4. The presence of the core rod 6 will directly provide the required holes in the formed product.

[0036] After the product is formed, the mold is opened. First, the moving mold 2 separates from the fixed mold 1 (actually, the fixed mold 1 remains stationary, and the moving mold 2 separates from the fixed mold 1 under the action of the corresponding driving structure). Because there is a delay gap 9 between the left side wall of the inclined guide groove 3a1 and the left side wall of the inclined guide post 8, allowing the inclined guide post 8 to move a certain distance in the mold opening direction within the inclined guide groove 3a1, the slider 3 only moves in the same direction as the moving mold 2 when the moving mold 2 first starts to move, but does not slide to the left. Only when the moving mold 2 moves to the point where the left side wall of the inclined guide groove 3a1 abuts against the left side wall of the inclined guide post 8, eliminating the delay gap 9, will the slider 3 begin to slide to the left as the moving mold 2 continues to move. In other words, the slider 3 in this application is opened with a delay, and the delay time is the time from when the moving mold 2 first moves to the point where the left side wall of the inclined guide groove 3a1 abuts against the left side wall of the inclined guide post 8. Furthermore, since a top pressure spring 7 is also provided in the through hole 3a5 to act on the core rod 6 in the direction away from the cavity 4, and during the process of the inclined guide post 8 moving a certain distance in the inclined guide groove 3a1 along the mold opening direction, a gap is formed between the slider 3 and the fixed mold 1 that continuously increases and allows the core rod 6 to move in the direction away from the cavity 4, during the time when the slider 3 is delayed in opening, the core rod 6 can move continuously in the direction away from the cavity 4 under the action of the top pressure spring 7 as the moving mold 2 separates from the fixed mold 1, so as to automatically complete the separation of the core rod 6 from the product.

[0037] This mold, by setting the core rod 6, used to form holes on the product, into the through hole 3a5 of the slider 3, and setting a top pressure spring 7 in the through hole 3a5 that acts on the core rod 6 in a direction away from the cavity 4, and combining this with a delay gap 9 set between the left side wall of the inclined guide groove 3a1 and the left side wall of the inclined guide post 8, allows the core rod 6 to be automatically pulled out directly by setting the slider 3 to open with a delay and cooperating with the top pressure spring 7, while the holes on the product can be formed normally. This eliminates the need for a separate core pulling mechanism and greatly simplifies the overall structure of the mold.

[0038] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A mold, comprising a fixed mold (1), a movable mold (2), a slider (3) connected to the movable mold (2) and capable of sliding to the left out of the movable mold (2), and a core rod (6) inclined relative to the sliding direction of the slider (3), wherein the fixed mold (1), the movable mold (2), and the slider (3) form a cavity (4), an inclined guide post (8) is fixed on the fixed mold (1), and an inclined guide groove (3a1) is provided on the slider (3) for the inclined guide post (8) to pass through, characterized in that, The slider (3) is provided with a through hole (3a5), and the core rod (6) is located in the through hole (3a5). One end of the core rod (6) abuts against the fixed mold (1) and the other end extends out of the through hole (3a5) into the cavity (4). A top pressure spring (7) is also provided in the through hole (3a5) acting on the core rod (6) in a direction away from the cavity (4). There is a delay gap (9) between the left side wall of the inclined guide groove (3a1) and the left side wall of the inclined guide post (8) to allow the inclined guide post (8) to move a certain distance in the inclined guide groove (3a1) along the mold opening direction when the mold is opened. During the process of the inclined guide post (8) moving a certain distance in the inclined guide groove (3a1) along the mold opening direction, a gap that continuously increases between the slider (3) and the fixed mold (1) is formed, allowing the core rod (6) to move in a direction away from the cavity (4). The upper end of the inclined guide post (8) is fixedly connected to a vertical A straight guide post (10) is set in a straight position and fixed to the fixed mold (1). The slider (3) has a top abutting surface (3b1) that abuts against the right side wall of the straight guide post (10). When the left side wall of the inclined guide groove (3a1) abuts against the left side wall of the inclined guide post (8), the top abutting surface (3b1) is located below the straight guide post (10). The slider (3) includes a body (3a) and a top pressing block (3b) fixed to the body (3a) by fasteners. The top abutting surface (3b1) is located on the top pressing block (3b). A support spring (11) is abutting between the right side of the body (3a) and the moving mold (2). A limit block (12) is fixed outside the moving mold (2). When the inclined guide post (8) is separated from the inclined guide groove (3a1), the slider (3) abuts against the limit block (12) and the support spring (11) is in a compressed state.

2. The mold according to claim 1, characterized in that, The inclined guide post (8) and the straight guide post (10) are integrally fixed together, and the hardness of the straight guide post (10) is greater than that of the top pressure block (3b).

3. The mold according to claim 2, characterized in that, The through hole (3a5) is a stepped hole. The core rod (6) includes a head (6a) located within the larger part of the through hole (3a5) and a rod part (6b) passing through the smaller part of the through hole (3a5). The top pressure spring (7) is sleeved on the rod part (6b) located within the larger part of the through hole (3a5), and its two ends abut against the stepped surface inside the head (6a) and the through hole (3a5), respectively.

4. The mold according to claim 3, characterized in that, The fixed mold (1) has a groove (1a), the slider (3) has a protrusion (3a4) that protrudes upward and is located in the groove (1a), the through hole (3a5) is located on the protrusion (3a4), the groove (1a) has a mating surface (1a1) that is perpendicular to the core rod (6), the head (6a) of the core rod (6) is attached to the mating surface (1a1), the protrusion (3a4) has a side surface that is parallel to the mating surface (1a1), and the larger part of the through hole (3a5) penetrates through this side surface.

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