Replaceable core-pulling mold structure for hole machining

Abstract

A replaceable core-pulling mold structure for hole machining comprises a core-pulling assembly, an upper movable mold and a lower fixed mold, a guide hole obliquely extending upwards is formed in the lower side face of the upper movable mold, the upper movable mold is provided with a transverse guide rail located above the guide hole, the core-pulling assembly comprises a core-pulling rod, a bearing pin and a forming pin, and the core-pulling rod is slidably connected to the guide hole; the upper end of the core-pulling rod extends to the position above the guide hole and is slidably connected to the guide rail, the lower end of the core-pulling rod extends to the position below the guide hole and is provided with a mounting through hole, the mounting through hole comprises a forming end and a bearing end, and the bearing pin comprises a first end fixedly inserted into the bearing end and a second end facing the forming end and provided with a screw. The forming pin comprises a first end located outside the forming end and a second end inserted into the forming end, and the second end of the forming pin is provided with a screw hole screwed to the screw. According to the scheme, convenient installation of the forming pin relative to the installation through hole is achieved, on the other hand, the probability that the forming pin is stuck relative to the installation through hole is effectively reduced, and good practicability is achieved.

Description

Technical Field

[0001] The invention relates to the technical field of moulds, and in particular to a hole processing replaceable core pulling mould structure. Background Art

[0002] Molds are a type of processing equipment widely used in modern manufacturing, and are widely used in technical fields such as automobiles, electronics, and home appliances. For injection molds, the main working principle is to form a cavity structure between the upper mold base and the lower mold base. When the upper mold base and the lower mold base are closed, hot melt raw materials are injected into the cavity. After the raw materials are cooled and formed, the upper mold base and the lower mold base are separated from each other to achieve demoulding, and the finished product can be taken out of the cavity.

[0003] For some products, it is necessary to process a hole structure during the molding process. The existing technology is to set a core pull at the corresponding position of the cavity. The core pull is provided with a molding pin located at the corresponding position in the cavity. The hole structure is processed by the molding pin during the product molding process, and the core pull cooperates with the inclined guide hole of the upper mold base to realize the release from the product hole structure during demolding. However, the same product may need to process a hole structure with different apertures according to different requirements. At this time, it is necessary to replace the molding pin of the core pull. For the sake of convenient disassembly and assembly, the current conventional practice is to open a screw hole at the end of the core pull, and one end of the molding pin is provided with an external thread. By screwing the threaded end of the molding pin to the screw hole, the molding pin can be installed and replaced relative to the core pull. However, in actual use, it is found that since the molding pin and the end of the core pull are both located in the cavity, as the raw material in the cavity is injected, the raw material may enter between the molding pin and the screw hole of the core pull, causing the two to be stuck to each other, and then the subsequent molding pin cannot be disassembled relative to the core pull, affecting normal use. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that since the molding pin and the core pulling end are both located in the mold cavity, as the raw material in the mold cavity is injected, the raw material may enter between the molding pin and the screw hole of the core pulling, causing the two to be stuck to each other, and then the subsequent molding pin cannot be disassembled and assembled relative to the core pulling, 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 scheme, the upper movable mold cooperates with the lower fixed mold to form a cavity after the molds are closed, and the lower end of the core pulling rod cooperates with the forming pin to process a hole structure on the product in the cavity; at the same time, the above scheme optimizes the design of the core pulling assembly by arranging a mounting through hole at the lower end of the core pulling rod, the mounting through hole has a forming end and a receiving end, wherein the receiving end is used to fasten the receiving pin, so that the screw rod of the receiving pin is located in the mounting through hole and faces the forming end, and the forming pin is then inserted from the forming end of the mounting through hole and connected to the screw rod of the receiving pin through the screw hole, thereby realizing the fixation of the forming pin in the mounting through hole, and the installation is simple and convenient; and the contact surface between the forming pin and the forming end of the mounting through hole is slidingly fitted, which can reduce the entry of raw materials into the forming pin and the forming end of the mounting through hole. The probability of the gap between the forming ends of the installation through hole is reduced. Even if the raw material enters the gap between the forming pin and the forming end of the installation through hole, the rotational resistance to the forming pin is still small, and the forming pin can be easily disassembled, assembled and replaced by rotating the forming pin; further, in the event that the forming pin and the forming end of the installation through hole are stuck, since the first end of the forming pin protrudes outside the forming end of the installation through hole, the first end of the forming pin can be knocked in the direction of the receiving pin, so that the forming pin pushes the receiving pin to separate from the receiving end of the installation through hole. Since the forming pin and the installation through hole are slidingly fitted, the forming pin can be removed from the installation through hole by further pulling out the receiving pin, and then the receiving pin can be reassembled and replaced with a new forming pin. After adopting the above scheme, 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 removed from the installation through hole by knocking the first end of the forming pin in the direction of the receiving pin, without causing damage to the core pulling rod, which has good practicality.

[0007] In an improved solution, the receiving end of the mounting through hole is provided with a circumferential annular groove, and the first end of the receiving pin is provided with a circumferential convex ring, and the convex ring is snap-fitted into the annular groove. The convex ring will be detached from the receiving pin after exceeding the rated load, so that the receiving pin is fixed relative to the mounting through hole by the snap-fitting fit between the convex ring and the annular groove.

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

[0009] In an improved solution, the aperture of the receiving end of the mounting through hole gradually decreases in the direction toward the forming end to form a cone, and the shape of the first end portion of the receiving pin is adapted to the shape of the receiving end of the mounting through hole. The cone-shaped receiving end of the mounting through hole can facilitate the insertion of the receiving pin, and increases the contact area between the receiving end of the mounting through hole and the first end portion of the receiving pin, thereby making the connection between the receiving pin and the mounting through hole more stable; in addition, since the axial force exerted on the forming pin is mainly the resistance when the forming pin is pulled out of the hole-like structure of the product during demolding, the aperture of the receiving end of the mounting through hole gradually decreases in the direction toward the forming end, thereby allowing the receiving pin to withstand a larger axial force in the direction away from the forming pin, thereby better offsetting the resistance when the forming pin is pulled out of the hole-like structure of the product.

[0010] In an improved solution, the outer peripheral wall of the core pulling rod is provided with a lubrication groove extending from top to bottom, and the lubrication groove is filled with lubricating oil, so that the sliding of the core pulling rod in the guide hole is more stable.

[0011] In an improved solution, the lubrication groove is wavy or spiral, so as to better store the lubrication oil.

[0012] In an improved solution, the upper end of the core pulling rod is detachably connected to a slider, and 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 during maintenance when necessary.

[0013] In an improved solution, the upper end of the core-pulling rod is provided with an assembly hole, and the slider is provided with a bolt screwed to the assembly hole, so that the assembly and disassembly between the core-pulling rod and the slider is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic top view of a hole processing replaceable core pulling mold structure; Figure 2 For along Figure 1 Schematic cross-sectional view of the AA section line; Figure 3 For Figure 2 On the basis of the above, the schematic diagram after the upper movable mold is hidden; Figure 4 A schematic diagram of a core pulling rod of a hole processing replaceable core pulling mold structure; Figure 5 The exploded schematic diagram is a core pulling rod, receiving pin and forming pin of a hole processing replaceable core pulling mold structure.

[0015] Description of reference numerals: 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

[0016] 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.

[0017] 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.

[0018] 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.

[0019] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] See also Figure 1-Figure 5The embodiment of the present invention provides a hole processing replaceable core pulling mold structure, including 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, and a guide hole 11 extending upwardly 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 the guide rail 12 is parallel to the projection of the guide hole 11 on the horizontal plane, and the core pulling assembly includes 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, and 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 It extends to the bottom of the guide hole 11 and is provided with a mounting hole 31, the axis of the mounting hole 31 is parallel to the guide rail 12, the end of the mounting 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 inserted in 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 hole 31, and the second end of the molding pin 5 is provided with a screw hole 51 screwed to the screw 41.

[0021] In the above scheme, the upper movable mold 1 cooperates with the lower fixed mold 2 to form a cavity after the mold is closed, and the lower end of the core puller 3 cooperates with the forming pin 5 to process a hole structure on the product in the cavity; Figure 2As a reference, the upper movable mold 1 rises during demoulding, and the core pulling rod 3 moves to the right first due to the action of the guide hole 11, driving the molding pin 5 to move to the right together until it escapes from the hole 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 moves up with the upper movable mold 1 to achieve demoulding. At the same time, the above scheme optimizes the design of the core pulling assembly by setting a mounting hole 31 at the lower end of the core pulling rod 3, and the mounting hole 31 has a forming end and a receiving end, wherein the receiving end is used to fasten the receiving pin 4, so that the screw 41 of the receiving pin 4 is located in the mounting hole 31 and faces the forming end, and the molding pin 5 is then inserted from the forming end of the mounting hole 31 and connected with the screw 41 of the receiving pin 4 through the screw hole 51, thereby realizing the fixation of the molding pin 5 in the mounting hole 31, and the installation is simple and convenient; and the contact surface between the molding pin 5 and the molding end of the mounting hole 31 is slidingly fitted, which can reduce the probability of raw materials entering the gap between the molding pin 5 and the molding end of the mounting hole 31. Even if the raw materials enter the molding pin 5 and the formed end of the mounting through hole 31, the rotational resistance of the formed pin 5 is still small, and the formed pin 5 can be easily disassembled, assembled and replaced by rotating the formed pin 5; further, in the event that the formed pin 5 and the formed end of the mounting through hole 31 are stuck, since the first end of the formed pin 5 protrudes outside the formed end of the mounting through hole 31, the first end of the formed pin 5 can be knocked in the direction of the receiving pin 4, so that the formed pin 5 pushes the receiving pin 4 to separate from the receiving end of the mounting through hole 31, and since the formed pin 5 and the mounting through hole 31 are slidingly fitted, the receiving pin 4 can be further pulled out to remove the formed pin 5 from the mounting through hole 31, and then the receiving pin 4 can be reassembled and replaced with a new formed pin 5.

[0022] After adopting the above scheme, on the one hand, the convenient installation of the forming pin 5 relative to the mounting through hole 31 is achieved, and on the other hand, the probability of the forming pin 5 being stuck relative to the mounting through hole 31 is effectively reduced. Even if it is stuck, the first end of the forming pin 5 can be knocked in the direction of the receiving pin 4 to achieve the removal of the receiving pin 4 and the forming pin 5 relative to the mounting through hole 31 without causing damage to the core pulling rod 3, which has good practicality.

[0023] It should be understood that in order to process hole structures with different apertures, multiple forming pins 5 can be preset, and the outer diameters of the first ends of different forming pins 5 are different, and the outer diameters of the second ends are equal to the apertures of the forming ends of the mounting through hole 31, and the apertures of the screw holes 51 of the second ends of different forming pins 5 are consistent, so that the corresponding forming pin 5 can be selected as needed to be installed in the forming end of the mounting 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 mounting through hole 31, so as to achieve the sliding fit between the second end of the forming pin 5 and the forming end of the mounting through hole 31 like Figure 5As shown, in the present embodiment, 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 is snapped 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, so that the receiving pin 4 is fixed relative to the mounting through hole 31 through the snap fit between the convex ring 42 and the annular groove 311; and when the first end of the forming pin 5 is knocked 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 detached from the receiving pin 4, and the receiving pin 4 can be detached from the mounting through hole 31, and then the remaining broken convex ring 42 can be taken out from the mounting through hole 31.

[0024] Furthermore, 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, so that the corresponding surface of the lower portion of the core pulling rod 3 is flush, avoiding affecting the product surface.

[0025] Combination Figure 4 and Figure 5 As shown, as an improvement to the present embodiment, the aperture of the receiving end of the mounting through hole 31 gradually decreases in the direction toward the forming end to form a cone, and the shape of the first end portion of the receiving pin 4 is adapted to the shape of the receiving end of the mounting through hole 31. The tapered receiving end of the mounting through hole 31 can facilitate 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 portion of the receiving pin 4, so that the connection between the receiving pin 4 and the mounting through hole 31 is more stable; in addition, since the axial force on the forming pin 5 is mainly the resistance when the forming pin 5 is pulled out of the hole-like structure of the product during demolding, the aperture of the receiving end of the mounting through hole 31 gradually decreases in the direction toward the forming end, so that the receiving pin 4 can withstand a larger axial force in the direction away from the forming pin 5, and better offset the resistance when the forming pin 5 is pulled out of the hole-like structure of the product.

[0026] As another improvement to this embodiment, 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 lubricating oil, so that the sliding of the core pulling rod 3 in the guide hole 11 is more stable. The lubrication groove 32 is preferably wavy or spiral, so as to better store the lubricating oil.

[0027] In this embodiment, the upper end of the core pulling rod 3 is detachably connected with a slider 33, and the upper end of the core pulling rod 3 is slidably connected to the guide rail 12 through the slider 33, so that the core pulling rod 3 and the slider 33 can be easily disassembled and assembled when maintenance is required. More specifically, in this embodiment, the upper end of the core pulling rod 3 is provided with an assembly hole, the assembly hole has an internal thread, and the slider 33 is provided with a bolt screwed to the assembly hole, so that the disassembly and assembly between the core pulling rod and the slider is simple and convenient; or in other embodiments, an external thread can be provided on the upper end of the core pulling rod 3, a hole is opened on the slider 33 and an internal thread is provided, and the two are directly screwed.

[0028] It should be noted that, in the description of the present application, the terms "inside", "outside", etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the 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 cannot be understood as a limitation on the present application; all directional indications (such as up, down, left, right, front, back, inside, and outside) are only used to explain the relative positional relationship, movement, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0029] In the description of the present application, the description with reference to the terms "one embodiment", "some embodiments", "in the present embodiment", "specific example", or "some examples" etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0030] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on 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 is 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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