A replaceable core-pulling die structure for hole machining

Abstract

A replaceable core-pulling die structure for hole machining, comprising a core-pulling assembly, an upper movable die and a lower fixed die. An upwardly inclined guide hole is formed on the lower side surface of the upper movable die. The upper movable die is provided with a horizontal guide rail located above the guide hole. The core-pulling assembly includes a core-pulling rod, a receiving pin and a forming pin. The core-pulling rod is slidably connected to the guide hole. The upper end of the core-pulling rod extends above the guide hole and is slidably connected to the guide rail. The lower end of the core-pulling rod extends below the guide hole and is provided with an installation through hole. The installation through hole includes a forming end and a receiving end. The receiving pin includes a first end fixedly inserted into the receiving end and a second end facing the forming end and provided with a screw rod. The forming pin includes a first end located outside the forming end and a second end inserted into the forming end. A threaded hole screwed to the screw rod is provided at the second end of the forming pin. The above solution realizes the convenient installation of the forming pin relative to the installation through hole. On the other hand, it effectively reduces the probability of the forming pin being stuck relative to the installation through hole, and has good practicability.

Description

Technical Field

[0001] The present invention relates to the technical field of molds, and particularly to a hole machining replaceable core-pulling mold structure. Background Art

[0002] A mold is a processing device widely used in modern manufacturing, and is widely applicable to technical fields such as automobiles, electronics, and household appliances. For an injection mold, its main working principle is to form a cavity structure between an upper mold base and a lower mold base. After the upper mold base and the lower mold base are closed, a hot melt raw material is injected into the cavity. After the raw material is cooled and formed, the upper mold base and the lower mold base are separated from each other to realize demolding, and the finished product can be taken out of the cavity.

[0003] For some products, it is necessary to machine a hole structure during the forming process. The prior art is to set a core-pulling mechanism at a corresponding position in the cavity. The core-pulling mechanism is provided with a forming pin located at a corresponding position in the cavity, and the hole structure is machined by the forming pin during the product forming process. When demolding, the core-pulling mechanism cooperates with the inclined guide hole of the upper mold base to realize the withdrawal from the hole structure of the product. However, for the same product, different hole diameters of the hole structure may be required according to different requirements. At this time, it is necessary to replace the forming pin of the core-pulling mechanism. For the convenience of disassembly and assembly, the current common practice is to open a threaded hole at the end of the core-pulling mechanism, and one end of the forming pin is provided with an external thread. By screwing the threaded end of the forming pin into the threaded hole, the installation and replacement of the forming pin relative to the core-pulling mechanism can be realized. However, it is found in actual use that since both the forming pin and the end of the core-pulling mechanism are located in the cavity, with the injection of the raw material in the cavity, the raw material may enter between the forming pin and the threaded hole of the core-pulling mechanism, resulting in the two being stuck to each other, and then the subsequent forming pin cannot be disassembled and assembled relative to the core-pulling mechanism, affecting normal use. Summary of the Invention

[0004] The object of the present invention is to solve the problem in the prior art that since both the forming pin and the end of the core-pulling mechanism are located in the cavity, with the injection of the raw material in the cavity, the raw material may enter between the forming pin and the threaded hole of the core-pulling mechanism, resulting in the two being stuck to each other, and then the subsequent forming pin cannot be disassembled and assembled relative to the core-pulling mechanism, affecting normal use.

[0005] In order to solve the above problems, the present invention provides a hole processing replaceable core pulling mold structure, comprising a core pulling assembly, an upper movable mold and a lower fixed mold, a cavity is formed between the upper movable mold and the lower fixed mold, a guide hole extending upwardly obliquely is opened on the lower side surface of the upper movable mold, the upper movable mold is provided with a transverse guide rail, the guide rail is located above the guide hole and the guide rail is parallel to the projection of the guide hole on the horizontal plane, the core pulling assembly comprises a core pulling rod, a receiving pin and a forming pin, the core pulling rod is slidably connected to the guide hole, the upper end of the core pulling rod extends above the guide hole and is slidably connected to the guide rail, and the lower end of the core pulling rod extends to A mounting through hole is provided below the guide hole, and the axis of the mounting through hole is parallel to the guide rail. The end of the mounting through hole facing away from the lateral movement direction of the core pulling rod during demolding is the forming end, and the end facing the lateral movement direction of the core pulling rod during demolding is the receiving end. The receiving pin includes a first end fixedly inserted in the receiving end and a second end facing the forming end and provided with a screw. The forming pin includes a first end located outside the forming end and a second end inserted into the forming end. The second end of the forming pin is slidably fitted with the forming end of the mounting through hole, and the second end of the forming pin is provided with a screw hole screwed to the screw.

[0006] In the above solution, the upper moving die cooperates with the lower fixed die to form a cavity after clamping. The lower end of the core-pulling rod cooperates with the forming pin to machine a hole structure on the product in the cavity. At the same time, the above solution optimizes the design of the core-pulling assembly. By providing an installation through-hole at the lower end of the core-pulling rod, the installation through-hole has a forming end and a receiving end. The receiving end is used for firmly connecting the receiving pin, so that the screw rod of the receiving pin is located in the installation through-hole and faces the forming end. The forming pin then inserts from the forming end of the installation through-hole and realizes connection with the screw rod of the receiving pin through a threaded hole, thereby realizing the fixation of the forming pin in the installation through-hole. The installation is simple and convenient. The contact surface between the forming pin and the forming end of the installation through-hole is in sliding fit, which can reduce the probability of raw material entering the gap between the forming pin and the forming end of the installation through-hole. Even if the raw material enters the gap between the forming pin and the forming end of the installation through-hole, the rotational resistance of the forming pin is still small, and the disassembly and replacement of the forming pin can be achieved relatively easily by rotating the forming pin. Further, in case of the situation that the forming pin is stuck with the forming end of the installation through-hole, since the first end of the forming pin protrudes out of the forming end of the installation through-hole, the first end of the forming pin can be struck in the direction of the receiving pin, so that the forming pin pushes the receiving pin to disengage from the receiving end of the installation through-hole. Since the forming pin and the installation through-hole are in sliding fit, the forming pin can be taken out of the installation through-hole by further pulling out the receiving pin, and then the receiving pin can be reassembled and a new forming pin can be replaced. After adopting the above solution, on the one hand, the convenient installation of the forming pin relative to the installation through-hole is realized, and on the other hand, the probability of the forming pin being stuck relative to the installation through-hole is effectively reduced. Even if it is stuck, the receiving pin and the forming pin can be taken out relative to the installation through-hole by striking the first end of the forming pin in the direction of the receiving pin, without causing damage to the core-pulling rod, and it has good practicability.

[0007] In an improved solution, the receiving end of the installation through-hole is provided with a circumferential ring-embedded groove, the first end of the receiving pin is provided with a circumferential convex ring, and the convex ring is clamped into the ring-embedded groove. The convex ring will disengage from the receiving pin after exceeding the rated load, so that the receiving pin realizes fixation relative to the installation through-hole through the clamping fit between the convex ring and the ring-embedded groove.

[0008] In an improved solution, the end face of the first end of the receiving pin is flush with the corresponding surface of the lower part of the core-pulling rod, so that the corresponding surface of the lower part of the core-pulling rod is flush, avoiding affecting the surface of the product.

[0009] In an improved solution, the aperture of the receiving end of the installation through-hole gradually decreases in the direction towards the forming end to form a taper. The shape of the first end of the receiving pin is adapted to the shape of the receiving end of the installation through-hole. The tapered shape of the receiving end of the installation through-hole facilitates the insertion of the receiving pin and increases the contact area between the receiving end of the installation through-hole and the first end of the receiving pin, making the connection between the receiving pin and the installation through-hole more stable. In addition, since the axial force on the forming pin is mainly the resistance when the forming pin is withdrawn from the hole-shaped structure of the product during demolding, the aperture of the receiving end of the installation through-hole gradually decreases in the direction towards the forming end, enabling the receiving pin to withstand a greater axial force in the direction away from the forming pin and better offsetting the resistance when the forming pin is withdrawn from the hole-shaped structure of the product.

[0010] In an improved solution, lubricating grooves extending downward are provided on the outer peripheral wall of the core-pulling rod, and lubricating oil is filled in the lubricating grooves, making the sliding of the core-pulling rod in the guide hole more stable.

[0011] In an improved solution, the lubricating grooves are in a wavy or spiral shape, enabling better storage of lubricating oil.

[0012] In an improved solution, a slider is detachably connected to the upper end of the core-pulling rod. The upper end of the core-pulling rod is slidably connected to the guide rail through the slider, so that the core-pulling rod and the slider can be disassembled and assembled when maintenance is needed.

[0013] In an improved solution, an assembly hole is provided at the upper end of the core-pulling rod, and a bolt screwed into the assembly hole is provided on the slider, making the disassembly and assembly between the core-pulling rod and the slider simple and convenient. Description of the Drawings

[0014] Figure 1 It is a top view schematic diagram of a core-pulling die structure for hole machining replacement;

[0015] Figure 2 It is Figure 1 a sectional view schematic diagram along the A-A section line in

[0016] Figure 3 It is Figure 2 a schematic diagram after hiding the upper moving die on the basis of

[0017] Figure 4 It is a schematic diagram of a core-pulling rod of a core-pulling die structure for hole machining replacement;

[0018] Figure 5 It is an exploded schematic diagram of a core-pulling rod, a receiving pin and a forming pin of a core-pulling die structure for hole machining replacement.

[0019] Explanation of the Reference Numerals

[0020] 1. Upper movable mold; 11. Guide hole; 12. Guide rail; 2. Lower fixed mold; 3. Pull-out rod; 31. Mounting through hole; 311. Ring embedding groove; 32. Lubrication groove; 33. Slider; 4. Socket pin; 41. Screw rod; 42. Convex ring; 5. Forming pin; 51. Screw hole. DETAILED DESCRIPTION

[0021] It should be understood by those skilled in the art that the following embodiments are only used to explain the technical principles of the embodiments of the present application and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art may adjust them as needed to adapt to specific application scenarios.

[0022] In the description of the following embodiments, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0023] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0024] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] See also Figures 1-5, A replaceable core-pulling die structure for hole machining provided by an embodiment of the present invention includes a core-pulling assembly, an upper movable die 1 and a lower fixed die 2. A cavity is formed between the upper movable die 1 and the lower fixed die 2. An upwardly inclined guide hole 11 is provided on the lower side surface of the upper movable die 1. The upper movable die 1 is provided with a horizontal guide rail 12. The guide rail 12 is located above the guide hole 11 and the guide rail 12 is parallel to the projection of the guide hole 11 on the horizontal plane. The core-pulling assembly includes a core-pulling rod 3, a receiving pin 4 and a forming pin 5. The core-pulling rod 3 is slidably connected to the guide hole 11. The upper end of the core-pulling rod 3 extends above the guide hole 11 and is slidably connected to the guide rail 12. The lower end of the core-pulling rod 3 extends below the guide hole 11 and is provided with a mounting through hole 31. The axis of the mounting through hole 31 is parallel to the guide rail 12. One end of the mounting through hole 31 facing away from the lateral movement direction of the core-pulling rod 3 during demolding is the forming end, and one end facing the lateral movement direction of the core-pulling rod 3 during demolding is the receiving end. The receiving pin 4 includes a first end fixedly inserted into the receiving end and a second end facing the forming end and provided with a screw rod 41. The forming pin 5 includes a first end located outside the forming end and a second end inserted into the forming end. The second end of the forming pin 5 is slidably fitted with the forming end of the mounting through hole 31. The second end of the forming pin 5 is provided with a threaded hole 51 screwed to the screw rod 41.

[0026] In the above solution, the upper movable die 1 cooperates with the lower fixed die 2 to form a cavity after clamping. The lower end of the core-pulling rod 3 cooperates with the forming pin 5 to machine a hole structure on the product in the cavity; Figure 2Taking [a certain reference], when demolding, the upper movable mold 1 rises. Due to the action of the guide hole 11, the core-pulling rod 3 first moves to the right, driving the forming pin 5 to move to the right together until it disengages from the hole-shaped structure of the product. When the sliding stroke of the upper end of the core-pulling rod 3 relative to the slide rail reaches the limit, the core-pulling rod 3 rises with the upper movable mold 1 to achieve demolding. At the same time, the above solution optimizes the design of the core-pulling assembly. By providing an installation through-hole 31 at the lower end of the core-pulling rod 3, the installation through-hole 31 has a forming end and a receiving end. The receiving end is used for firmly connecting the receiving pin 4, so that the screw 41 of the receiving pin 4 is located in the installation through-hole 31 and faces the forming end. The forming pin 5 is then inserted into the forming end of the installation through-hole 31 and connected to the screw 41 of the receiving pin 4 through the screw hole 51, thereby realizing the fixation of the forming pin 5 in the installation through-hole 31, which is simple and convenient to install; and the contact surface between the forming pin 5 and the forming end of the installation through-hole 31 is in sliding fit, which can reduce the probability of raw material entering the gap between the forming pin 5 and the forming end of the installation through-hole 31. Even if the raw material enters the gap between the forming pin 5 and the forming end of the installation through-hole 31, the rotational resistance of the forming pin 5 is still small, and the disassembly and replacement of the forming pin 5 can be easily achieved by rotating the forming pin 5; further, in case of the situation where the forming pin 5 is stuck with the forming end of the installation through-hole 31, since the first end of the forming pin 5 protrudes outside the forming end of the installation through-hole 31, the first end of the forming pin 5 can be tapped in the direction of the receiving pin 4, so that the forming pin 5 pushes the receiving pin 4 to disengage from the receiving end of the installation through-hole 31. Since the forming pin 5 and the installation through-hole 31 are in sliding fit, the forming pin 5 can be taken out of the installation through-hole 31 by further pulling out the receiving pin 4, and then the receiving pin 4 can be reassembled and a new forming pin 5 can be replaced.

[0027] After adopting the above solution, on the one hand, the convenient installation of the forming pin 5 relative to the installation through-hole 31 is realized, and on the other hand, the probability of the forming pin 5 being stuck relative to the installation through-hole 31 is effectively reduced. Even if it is stuck, the receiving pin 4 and the forming pin 5 can be taken out relative to the installation through-hole 31 by tapping the first end of the forming pin 5 in the direction of the receiving pin 4, without causing damage to the core-pulling rod 3, and it has good practicability.

[0028] It should be understood that in order to machine hole body structures with different hole diameters, multiple forming pins 5 can be preset. The outer diameters of the first ends of different forming pins 5 are different, and the outer diameter of the second end is equal to the hole diameter of the forming end of the installation through-hole 31, and the hole diameters of the screw holes 51 at the second ends of different forming pins 5 are the same, so that the corresponding forming pin 5 can be selected according to needs and inserted into the forming end of the installation through-hole 31. The outer diameter of the second end of the forming pin 5 is equal to the inner diameter of the forming end of the installation through-hole 31, so as to realize the sliding fit between the second end of the forming pin 5 and the forming end of the installation through-hole 31.

[0029] Such as Figure 5As shown, in this embodiment, the receiving end of the mounting through-hole 31 is provided with a circumferential ring groove 311, and the first end of the receiving pin 4 is provided with a circumferential convex ring 42. The convex ring 42 is snapped into the ring groove 311, and the convex ring 42 is designed to be disengaged from the receiving pin 4 after exceeding the rated load. Thus, the receiving pin 4 is fixed relative to the mounting through-hole 31 through the snap-fit between the convex ring 42 and the ring groove 311. When the first end of the forming pin 5 is struck in the direction of the receiving pin 4 and the convex ring 42 is subjected to an external force exceeding the rated load, the convex ring 42 is disengaged from the receiving pin 4, and the receiving pin 4 can be disengaged from the mounting through-hole 31. Subsequently, the remaining broken convex ring 42 can be removed from the mounting through-hole 31.

[0030] Further, the end face of the first end of the receiving pin 4 is flush with the corresponding surface of the lower part of the core-pulling rod 3, so that the corresponding surfaces of the lower part of the core-pulling rod 3 are flush, avoiding affecting the surface of the product.

[0031] Combined Figure 4 and Figure 5 As shown, as an improved solution for this embodiment, the aperture diameter of the receiving end of the mounting through-hole 31 gradually decreases in the direction towards the forming end to form a taper. The shape of the first end of the receiving pin 4 is adapted to the shape of the receiving end of the mounting through-hole 31. The tapered shape of the receiving end of the mounting through-hole 31 facilitates the insertion of the receiving pin 4 and increases the contact area between the receiving end of the mounting through-hole 31 and the first end of the receiving pin 4, making the connection between the receiving pin 4 and the mounting through-hole 31 more stable. In addition, since the axial force on the forming pin 5 is mainly the resistance when the forming pin 5 is withdrawn from the hole-shaped structure of the product during demolding, the aperture diameter of the receiving end of the mounting through-hole 31 gradually decreases in the direction towards the forming end, enabling the receiving pin 4 to withstand a greater axial force in the direction away from the forming pin 5 and better offsetting the resistance when the forming pin 5 is withdrawn from the hole-shaped structure of the product.

[0032] As another improvement to this embodiment, the outer peripheral wall of the core-pulling rod 3 is provided with a lubricating groove 32 extending downward from top to bottom, and the lubricating groove 32 is filled with lubricating oil, making the sliding of the core-pulling rod 3 in the guide hole 11 more stable. The lubricating groove 32 is preferably wavy or spiral, so as to better store the lubricating oil.

[0033] In this embodiment, a slider 33 is detachably connected to the upper end of the core-pulling rod 3. The upper end of the core-pulling rod 3 is slidably connected to the guide rail 12 through the slider 33, so that the disassembly and assembly of the core-pulling rod 3 and the slider 33 are facilitated when maintenance is required. More specifically, in this embodiment, an assembly hole is provided at the upper end of the core-pulling rod 3. The assembly hole has internal threads, and the slider 33 is provided with bolts screwed into the assembly hole, making the disassembly and assembly between the core-pulling rod and the slider simple and convenient; or in other embodiments, external threads can also be provided at the upper end of the core-pulling rod 3, an opening is made on the slider 33 and internal threads are provided, and the two are directly screwed together.

[0034] It should be noted that in the description of this application, terms such as "inner" and "outer" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or component must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to this application; all directional indications (such as up, down, left, right, front, back, inner, outer) are only used to explain the relative positional relationships and movement conditions between components in a certain specific posture. If this specific posture changes, then the directional indications will also change accordingly.

[0035] In the description of this application, the descriptions referring to terms such as "one embodiment", "some embodiments", "in this embodiment", "specific examples", or "some examples" mean that the specific features, mechanisms, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0036] As described above, the above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed in this application should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

1. A hole processing replaceable core pulling mold structure, characterized in that: The invention comprises a core pulling assembly, an upper movable mold (1) and a lower fixed mold (2), wherein a cavity is formed between the upper movable mold (1) and the lower fixed mold (2), a guide hole (11) extending upwardly and obliquely is opened on the lower side surface of the upper movable mold (1), and the upper movable mold (1) is provided with a transverse guide rail (12), wherein the guide rail (12) is located above the guide hole (11) and is parallel to the projection of the guide hole (11) on a horizontal plane, and the core pulling assembly comprises a core pulling rod (3), a receiving pin (4) and a forming pin (5), wherein the core pulling rod (3) is slidably connected to the guide hole (11), the upper end of the core pulling rod (3) extends above the guide hole (11) and is slidably connected to the guide rail (12), and the lower end of the core pulling rod (3) extends to the guide hole (11). ) and is provided with a mounting through hole (31), the axis of the mounting through hole (31) is parallel to the guide rail (12), the end of the mounting through hole (31) facing away from the lateral movement direction of the core pulling rod (3) during demolding is a forming end and the end facing the lateral movement direction of the core pulling rod (3) during demolding is a receiving end, the receiving pin (4) includes a first end fixedly plugged into the receiving end and a second end facing the molding end and provided with a screw (41), the molding pin (5) includes a first end located outside the molding end and a second end inserted into the molding end, the second end of the molding pin (5) is slidably fitted with the molding end of the mounting through hole (31), and the second end of the molding pin (5) is provided with a screw hole (51) screwed to the screw (41).

2. The hole processing replaceable core pulling mold structure according to claim 1 is characterized in that: The receiving end of the mounting through hole (31) is provided with a circumferential annular groove (311), and the first end of the receiving pin (4) is provided with a circumferential convex ring (42), the convex ring (42) being snap-fitted into the annular groove (311), and the convex ring (42) is designed to be detached from the receiving pin (4) after exceeding the rated load.

3. The hole processing replaceable core pulling mold structure according to claim 2 is characterized in that: The end surface of the first end portion of the receiving pin (4) is flush with the corresponding surface of the lower portion of the core pulling rod (3).

4. The hole processing replaceable core pulling mold structure according to any one of claims 1 to 3, characterized in that: The aperture of the receiving end of the mounting through hole (31) gradually decreases in a direction toward the forming end to form a cone, and the shape of the first end of the receiving pin (4) is compatible with the shape of the receiving end of the mounting through hole (31).

5. The hole processing replaceable core pulling mold structure according to claim 1, characterized in that: The outer peripheral wall of the core pulling rod (3) is provided with a lubrication groove (32) extending from top to bottom, and the lubrication groove (32) is filled with lubrication oil.

6. The hole processing replaceable core pulling mold structure according to claim 5 is characterized in that: The lubrication groove (32) is wavy or spiral.

7. The hole processing replaceable core pulling mold structure according to claim 1 is characterized in that: The upper end of the core pulling rod (3) is detachably connected to a slider (33), and the upper end of the core pulling rod (3) is slidably connected to the guide rail (12) via the slider (33).

8. The hole processing replaceable core pulling mold structure according to claim 7, characterized in that: The upper end of the core-pulling rod (3) is provided with an assembly hole, and the sliding block (33) is provided with a bolt screwed to the assembly hole.

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