A slope in-mold cutting sprue mold

Abstract

The utility model relates to injection mold technical field more specifically, relate to a gradient mould in -cut off sprue mold, including back mould component, front mould component and thimble subassembly, back mould component includes back mould frame and back mould kernel, still include in -cut component, in -cut component includes telescopic part, oblique cutter, oblique guide block, the telescopic end of telescopic part moves telescoping in second direction, be equipped with inclined guide rail on oblique guide block, oblique cutter is along inclined guide rail and oblique guide block sliding connection. Oblique cutter can be relative telescopic part and move obliquely, and then the sprue of setting in recessed position is cut off automatically, when the product needed producing in single mould is more, sets up oblique cutter on both sides of telescopic end of telescopic part, sets up inclined guide rail on both sides of oblique guide block, makes two oblique cutters respectively tilt to move towards both sides, and then the sprue of two -sided product is cut off simultaneously, improves mould overall production efficiency, also reduces production cost.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and more specifically, to a sprue cut-off mold with an inward-curving angle. Background Technology

[0002] In injection molding, the in-mold cutting structure of a typical mold can only cut straight in and out along the driving direction. It is suitable for removing sprues at unobstructed locations at the ends of products. However, for some products that require injection from recessed areas, the sprues in the recessed areas are partially obstructed by the surrounding area. When the in-mold cutting structure cuts from the outside of the product towards the recessed area, the cutter cannot reach the root of the sprue and cannot remove it smoothly. Furthermore, the inclined cutter setting takes up too much space and cannot remove sprues from multiple products simultaneously, resulting in an excessively large mold size and high mold and production costs. Therefore, for such products, due to manufacturing cost considerations, an in-mold cutting structure is generally not used. Instead, the sprue waste is removed manually after injection molding. However, manual sprue trimming is inefficient, and the trimmed cuts are inconsistent, resulting in inconsistent product appearance and affecting product quality. Utility Model Content

[0003] To overcome the shortcomings of ordinary molds in the prior art that cannot cut off the sprue at the recessed position of the product, this utility model provides a sprue cutting mold with an inward cut at an angle, which can cut off the sprue at the recessed position of the product, eliminating the step of manually trimming the sprue, improving production efficiency and ensuring product quality.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: a sprue cutter with an inward cut at an angle, comprising a rear mold assembly, a front mold assembly, and an ejector pin assembly disposed in the rear mold assembly. The rear mold assembly includes a rear mold frame and a rear mold core disposed on the rear mold frame, and further includes inward cutting assemblies disposed on both sides of the rear mold frame. The inward cutting assemblies include a telescopic member connected to the rear mold frame, an angled cutter slidably connected to the telescopic end of the telescopic member in a first direction, and an angled guide block mounted on the rear mold core. The telescopic end of the telescopic member moves and extends in a second direction. The first direction and the second direction are perpendicular to each other. The angled cutter and the telescopic member are fixed relative to each other in the second direction. An inclined guide rail is provided on the angled guide block, and the angled cutter is slidably connected to the angled guide block along the inclined guide rail.

[0005] The rear mold assembly and the front mold assembly work together to produce injection-molded products. The rear mold assembly is fixed to the injection molding equipment, while the front mold assembly has a feeding channel and is mounted on the moving module of the injection molding equipment for mold opening and closing. In the rear mold assembly, both sides of the rear mold frame have internal cutting components. These two sets of internal cutting components are positioned opposite each other and work together to simultaneously cut the sprue towards the center part. Within the internal cutting components, a telescopic component is integrally mounted on the rear mold frame and is used to drive the angled cutter. The telescopic component directly or indirectly drives the angled cutter. Direct drive schemes use a cylinder or hydraulic cylinder, while indirect drive schemes use a motor with a gear and rack. The angled cutter is used to cut the sprue at the recessed position of the product. Specifically, the angled cutter is slidably connected to the telescopic end of the telescopic component in the first direction. The guide block is equipped with an inclined guide rail, which is set towards the root of the sprue at the recessed position of the product. The oblique cutter is slidably set on the inclined guide rail. In actual operation, the front mold assembly moves to open the mold. After all the mold cores on the rear mold assembly exit the mold, the ejector pin assembly works, thereby lifting the product and the sprue. During this process, the telescopic end of the telescopic component pushes the oblique cutter in the second direction. Under the guidance of the inclined guide rail, the oblique cutter moves towards the root of the sprue and cuts off the sprue when it is completely lifted. During this process, the oblique cutter also moves relative to the telescopic end of the telescopic component in the first direction, thereby ensuring that the oblique cutter can move obliquely smoothly. After cutting off the sprue, the telescopic end of the telescopic component retracts back to its original position, and the oblique cutter also resets along the inclined guide rail.

[0006] Preferably, it also includes a stop bar disposed on the rear mold core, and the oblique cutter is provided with an abutment portion, which abuts against the stop bar when the oblique cutter moves to a set position.

[0007] The stop lever is used to limit the travel of the oblique cutter and prevent it from moving too far. After the oblique cutter completely cuts off the sprue, the abutment part abuts against the stop lever, and the stop lever blocks the oblique cutter. The abutment part is located on the side of the oblique cutter, and the abutment surface is curved or flat.

[0008] Preferably, it further includes a straight cutter bar with one end detachably connected to the telescopic end of the telescopic member, and a guide rod connected to the rear mold frame. The oblique cutter is slidably connected to the other end of the straight cutter bar in a first direction, and the straight cutter bar is slidably connected to the guide rod in a second direction.

[0009] The telescopic component is indirectly connected to the oblique cutter via a straight cutter bar. The oblique cutter bar is slidably connected to the straight cutter bar in the first direction, and thus indirectly slidably connected to the telescopic component. A guide rod is provided to guide the straight cutter bar and improve the stability of the straight cutter bar's movement.

[0010] Preferably, it also includes a protrusion disposed on the linear tool bar and a limit switch fixedly connected to the telescopic member. When the linear tool bar retracts to its original position, the protrusion triggers the limit switch.

[0011] The limit switch determines whether the linear cutter bar has fully reset, and thus indirectly determines whether the oblique cutter has fully reset, thus avoiding part interference during the next mold closing and production.

[0012] Preferably, it also includes a fixing nut, the straight tool bar is provided with a groove, the protrusion is disposed in the groove, the telescopic end of the telescopic member is provided with a threaded rod, the threaded rod passes through the straight tool bar and is threadedly connected to the protrusion, and the fixing nut is fitted on the threaded rod and abuts against the end of the straight tool bar.

[0013] The protrusion is set in the slot and threadedly connected to the threaded rod on the telescopic end of the telescopic component. At the same time, the threaded rod is also equipped with a fixing nut. The fixing nut is tightened towards the straight tool bar, thereby clamping and fixing the end of the straight tool bar between the protrusion and the fixing nut, thus realizing the detachable connection between the straight tool bar and the threaded rod, and also allowing the fixed position of the straight tool bar to be adjusted.

[0014] Preferably, the telescopic component is a cylinder, and the telescopic rod of the cylinder is threaded.

[0015] The telescopic component can be a standard cylinder with threads on the telescopic rod.

[0016] Preferably, it also includes a micro switch installed on the rear mold frame, which is triggered when the ejector pin assembly is reset, and the micro switch is electrically connected to the limit switch.

[0017] A microswitch is set to determine the start time of the ejector assembly, which in turn facilitates setting the start time of the internal cutting assembly, enabling the sprue to be cut off immediately when it is fully raised, thus improving the cutting efficiency.

[0018] Preferably, the oblique cutter includes an oblique cutter bar slidably connected to the straight cutter bar in a first direction, and a blade detachably connected to the oblique cutter bar, wherein the oblique cutter bar and the straight cutter bar are fixed relative to each other in a second direction.

[0019] The oblique cutter consists of an oblique cutter bar and a blade, and the blade and oblique cutter bar are detachably connected for easy replacement.

[0020] Preferably, the inclined guide rail is a T-shaped guide rail, and the inclined tool bar and the straight tool bar are also slidably connected through the T-shaped guide rail.

[0021] By setting up the T-shaped guide rail, the oblique tool bar and the straight tool bar are prevented from separating during operation, and the oblique tool bar and the oblique guide block are also prevented from separating, thus ensuring the smooth sliding of the oblique tool bar as a whole.

[0022] Preferably, it also includes a fixing screw, wherein the blade and the oblique tool bar are connected by a dovetail groove, and the fixing screw passes through the blade and is threadedly connected to the oblique tool bar.

[0023] A dovetail groove is provided between the blade and the angled blade holder for connection, and a fixing screw is used for fixation to fully prevent the blade from shaking and ensure stable operation.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] With the above settings, the oblique cutter can move obliquely relative to the telescopic component, thereby automatically cutting off the sprue located in the recessed position. The telescopic component does not need to be tilted, reducing the space occupied and lowering the mold cost. At the same time, when a single mold needs to produce a large number of products, oblique cutters are set on both sides of the telescopic end of the telescopic component, and oblique guide rails are set on both sides of the oblique guide block, so that the two oblique cutters move obliquely to both sides respectively, thereby simultaneously cutting off the sprue of the products on both sides, improving the overall production efficiency of the mold and reducing production costs. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a sprue cut-off mold with an inclined die according to this utility model;

[0027] Figure 2 This is a schematic diagram of the internal structure of a sprue cutter mold with an inclined die according to this utility model;

[0028] Figure 3 This is a top view structural diagram of a sprue cut-off mold with an inclined die according to this utility model;

[0029] Figure 4 yes Figure 3 Enlarged schematic diagram of part A;

[0030] Figure 5 This is a schematic diagram of the internal cutting component of an inclined die for cutting off the sprue.

[0031] In the diagram: 1. Rear mold assembly; 2. Front mold assembly; 3. Ejector pin assembly; 4. Rear mold frame; 5. Rear mold core; 6. Internal cutting assembly; 7. Telescopic component; 8. Angled cutter; 9. Angled guide block; 10. Inclined guide rail; 11. Stop bar; 12. Abutment part; 13. Straight cutter bar; 14. Guide rod; 15. Protrusion; 16. Limit switch; 17. Fixing nut; 18. Slot; 19. Threaded rod; 20. Micro switch; 21. Angled cutter bar; 22. Blade; 23. Fixing screw. Detailed Implementation

[0032] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The positional relationships described in the drawings are for illustrative purposes only and should not be construed as limiting this patent.

[0033] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "long," and "short" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0034] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0035] Example 1

[0036] like Figure 1-4 As shown, a sprue cutter with an inward cut includes a rear mold assembly 1, a front mold assembly 2, and an ejector pin assembly 3 disposed in the rear mold assembly 1. The rear mold assembly 1 includes a rear mold frame 4 and a rear mold core 5 disposed on the rear mold frame 4. It also includes an inward cutting assembly 6 disposed on both sides of the rear mold frame 4. The inward cutting assembly 6 includes a telescopic member 7 connected to the rear mold frame 4, an inclined cutter 8 slidably connected to the telescopic end of the telescopic member 7 in a first direction, and an inclined guide block 9 mounted on the rear mold core 5. The telescopic end of the telescopic member 7 moves and extends in a second direction. The first direction and the second direction are perpendicular to each other. The inclined cutter 8 is fixed relative to the telescopic member 7 in the second direction. An inclined guide rail 10 is provided on the inclined guide block 9. The inclined cutter 8 is slidably connected to the inclined guide block 9 along the inclined guide rail 10.

[0037] The rear mold assembly 1 and the front mold assembly 2 cooperate to produce injection molded products. The rear mold assembly 1 is fixed on the injection molding equipment, and the front mold assembly 2 has a feeding channel and is set on the moving module of the injection molding equipment for opening and closing the mold. In the rear mold assembly 1, there are inner cutting components 6 on both sides of the rear mold frame 4. The two sets of inner cutting components 6 are arranged opposite each other and work together to cut off the sprue towards the center part. In the inner cutting component 6, the telescopic component 7 is installed as a whole on the rear mold frame 4 and is used to drive the oblique cutter 8. The telescopic component 7 directly drives or indirectly drives the oblique cutter 8. In the direct drive scheme, a cylinder or hydraulic cylinder is used, and in the indirect drive scheme, a motor with a gear and rack is used. The oblique cutter 8 is used to cut off the sprue at the recessed position of the product. Specifically, the oblique cutter 8 is slidably connected to the telescopic end of the telescopic component 7 in the first direction, and the oblique guide block... The 9th part is equipped with an inclined guide rail 10, which is set towards the root of the sprue at the recessed position of the product. The inclined cutter 8 is slidably set on the inclined guide rail 10. In actual operation, the front mold assembly 2 moves to open the mold, and after all the mold cores on the rear mold assembly 1 exit the mold, the ejector assembly 3 works, thereby lifting the product and the sprue. During the process, the telescopic end of the telescopic member 7 pushes the inclined cutter 8 in the second direction. Under the guidance of the inclined guide rail 10, the inclined cutter 8 moves towards the root of the sprue and cuts off the sprue when it is completely lifted. During this process, the inclined cutter 8 also moves relative to the telescopic end of the telescopic member 7 in the first direction, thereby ensuring that the inclined cutter 8 can move smoothly in an inclined direction. After cutting off the sprue, the telescopic end of the telescopic member 7 retracts back to its original position, and the inclined cutter 8 also resets along the inclined guide rail 10.

[0038] The beneficial effects of this embodiment are as follows: With the above-mentioned configuration, the oblique cutter 8 can move obliquely relative to the telescopic member 7, thereby automatically cutting off the sprue located in the recessed position. The telescopic member 7 does not need to be tilted, reducing the space occupied and reducing the mold cost. At the same time, when a single mold needs to produce a large number of products, oblique cutters 8 are provided on both sides of the telescopic end of the telescopic member 7, and oblique guide rails 10 are provided on both sides of the oblique guide block 9, so that the two oblique cutters 8 can move obliquely to both sides respectively, thereby simultaneously cutting off the sprue of the products on both sides, improving the overall production efficiency of the mold and reducing the production cost.

[0039] Example 2

[0040] This embodiment further defines the features of Embodiment 1, and its difference from Embodiment 1 lies in:

[0041] like Figure 4 As shown, it also includes a stop bar 11 disposed on the rear mold core 5, and an abutment part 12 provided on the oblique cutter 8. When the oblique cutter 8 moves to the set position, the abutment part 12 abuts against the stop bar 11. Figure 2-5As shown, it also includes a straight cutter bar 13, one end of which is detachably connected to the telescopic end of the telescopic member 7, and a guide rod 14 connected to the rear mold frame 4. The oblique cutter 8 is slidably connected to the other end of the straight cutter bar 13 in a first direction, and the straight cutter bar 13 is slidably connected to the guide rod 14 in a second direction. It also includes a protrusion 15 provided on the straight cutter bar 13, and a limit switch 16 fixedly connected to the telescopic member 7. When the straight cutter bar 13 retracts to its original position, the protrusion 15 triggers the limit switch 16. It also includes a fixing nut 17. The straight cutter bar 13 is provided with a groove 18, and the protrusion 15 is provided in the groove 18. The telescopic end of the telescopic member 7 is provided with a threaded rod 19, which passes through the straight cutter bar 13 and is threadedly connected to the protrusion 15. The fixing nut 17 is fitted on the threaded rod 19 and abuts against the end of the straight cutter bar 13. The telescopic member 7 is a cylinder, and the telescopic rod of the cylinder is threaded. It also includes a micro switch 20 installed on the rear mold frame 4. The micro switch 20 is triggered when the ejector pin assembly 3 is reset. The micro switch 20 is electrically connected to the limit switch 16.

[0042] A stop lever 11 is provided to limit the travel of the oblique cutter 8, preventing excessive movement. After the oblique cutter 8 completely cuts off the sprue, the abutment part 12 abuts against the stop lever 11, blocking the oblique cutter 8. The abutment part 12 is located on the side of the oblique cutter 8, and the abutment surface is curved or flat. The telescopic component 7 is indirectly connected to the oblique cutter 8 through the straight cutter bar 13. The oblique cutter 8 is slidably connected to the straight cutter bar 13 in the first direction, and thus indirectly slidably connected to the telescopic component 7. A guide rod 14 is provided to guide the straight cutter bar 13, improving the stability of its movement. A limit switch 16 determines whether the straight cutter bar 13 has fully reset, and thus indirectly determines whether the oblique cutter 8 has fully reset, preventing part interference during subsequent mold closing and production. The protrusion 15 is located within the slot 18 and threadedly connected to the threaded rod 19 on the telescopic end of the telescopic component 7. A fixing nut 17 is also provided on the threaded rod 19. The fixing nut 17 is tightened towards the straight cutter bar 13, thereby clamping and fixing the end of the straight cutter bar 13 between the protrusion 15 and the fixing nut 17. This achieves a detachable connection between the straight cutter bar 13 and the threaded rod 19, and also allows adjustment of the fixed position of the straight cutter bar 13. The telescopic component 7 can be a standard cylinder with threads on the telescopic rod. A micro switch 20 is provided to determine the start time of the ejector pin assembly 3, thereby facilitating the setting of the start time of the internal cutting assembly 6, enabling immediate cutting of the sprue when it is fully raised, improving cutting efficiency.

[0043] like Figure 4 As shown, in this embodiment, each straight cutter bar 13 is connected to two oblique cutters 8.

[0044] The remaining features and working principles of this embodiment are the same as those of Embodiment 1.

[0045] Example 3

[0046] Based on Example 1 or Example 2, Example 1 or Example 2 are further defined, with the following differences:

[0047] like Figure 4-5 As shown, the oblique cutter 8 includes an oblique cutter bar 21 slidably connected to the straight cutter bar 13 in a first direction, and a blade 22 detachably connected to the oblique cutter bar 21. The oblique cutter bar 21 and the straight cutter bar 13 are fixed relative to each other in a second direction. The inclined guide rail 10 is a T-shaped guide rail, and the oblique cutter bar 21 and the straight cutter bar 13 are also slidably connected through the T-shaped guide rail. It also includes a fixing screw 23, and the blade 22 is connected to the oblique cutter bar 21 through a dovetail groove. The fixing screw 23 passes through the blade 22 and is threadedly connected to the oblique cutter bar 21.

[0048] The oblique cutter 8 consists of an oblique cutter bar 21 and a blade 22, with the blade 22 detachably connected to the oblique cutter bar 21 for easy replacement. The T-shaped guide rail prevents the oblique cutter bar 21 from disengaging from the straight cutter bar 13 during operation, and also prevents the oblique cutter bar 21 from disengaging from the oblique guide block 9, ensuring smooth sliding of the oblique cutter bar 21. A dovetail groove connects the blade 22 to the oblique cutter bar 21, and it is secured with fixing screws 23, effectively preventing blade 22 from wobbling and ensuring stable operation.

[0049] The remaining working principles and processes of this embodiment are the same as those of Embodiment 1 or Embodiment 2.

[0050] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A sprue cutter with an in-mold design, comprising a rear mold assembly (1), a front mold assembly (2), and an ejector assembly (3) disposed in the rear mold assembly (1), wherein the rear mold assembly (1) comprises a rear mold frame (4) and a rear mold core (5) disposed on the rear mold frame (4), characterized in that, It also includes internal cutting components (6) respectively disposed on both sides of the rear mold frame (4). The internal cutting components (6) include a telescopic member (7) connected to the rear mold frame (4), an oblique cutter (8) slidably connected to the telescopic end of the telescopic member (7) in a first direction, and an oblique guide block (9) mounted on the rear mold core (5). The telescopic end of the telescopic member (7) moves and extends in a second direction. The first direction and the second direction are perpendicular to each other. The oblique cutter (8) and the telescopic member (7) are fixed relative to each other in the second direction. An inclined guide rail (10) is provided on the oblique guide block (9). The oblique cutter (8) is slidably connected to the oblique guide block (9) along the oblique guide rail (10).

2. The inclined die for cutting off the sprue gate according to claim 1, characterized in that: It also includes a stop bar (11) provided on the rear mold core (5), and an abutment part (12) provided on the oblique cutter (8). When the oblique cutter (8) moves to the set position, the abutment part (12) abuts against the stop bar (11).

3. The inclined die for cutting off the sprue gate according to claim 2, characterized in that: It also includes a straight cutter bar (13) with one end detachably connected to the telescopic end of the telescopic member (7), and a guide rod (14) connected to the rear mold frame (4). The oblique cutter (8) is slidably connected to the other end of the straight cutter bar (13) in a first direction, and the straight cutter bar (13) is slidably connected to the guide rod (14) in a second direction.

4. The inclined die for cutting off the sprue gate according to claim 3, characterized in that: It also includes a protrusion (15) disposed on the straight tool bar (13) and a limit switch (16) fixedly connected to the telescopic member (7). When the straight tool bar (13) retracts back to its original position, the protrusion (15) triggers the limit switch (16).

5. The inclined die for cutting off the sprue gate according to claim 4, characterized in that: It also includes a fixing nut (17), a groove (18) on the straight tool bar (13), a protrusion (15) in the groove (18), a threaded rod (19) on the telescopic end of the telescopic member (7), the threaded rod (19) passing through the straight tool bar (13) and threadedly connected to the protrusion (15), and the fixing nut (17) is fitted on the threaded rod (19) and abuts against the end of the straight tool bar (13).

6. The inclined die for cutting off the sprue gate according to claim 5, characterized in that: The telescopic component (7) is a cylinder, and the telescopic rod of the cylinder is threaded.

7. The inclined die for cutting off the sprue gate according to claim 4, characterized in that: It also includes a micro switch (20) installed on the rear mold frame (4), which is triggered when the ejector pin assembly (3) is reset, and the micro switch (20) is electrically connected to the limit switch (16).

8. The inclined die for cutting off the sprue gate according to claim 3, characterized in that: The oblique cutter (8) includes an oblique cutter bar (21) slidably connected to the straight cutter bar (13) in a first direction, and a blade (22) detachably connected to the oblique cutter bar (21), wherein the oblique cutter bar (21) and the straight cutter bar (13) are fixed relative to each other in a second direction.

9. A sprue cutter with an inward bevel as described in claim 8, characterized in that: The inclined guide rail (10) is a T-shaped guide rail, and the inclined tool bar (21) and the straight tool bar (13) are also slidably connected through the T-shaped guide rail.

10. A sprue cutter with an inward bevel as described in claim 8, characterized in that: It also includes a fixing screw (23), the blade (22) and the oblique tool bar (21) are connected by a dovetail groove, and the fixing screw (23) passes through the blade (22) and is threadedly connected to the oblique tool bar (21).

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