Internal cutting device of injection mold
By introducing an incision device into the injection mold and automatically cutting the gate, the problem of low manual cutting efficiency is solved, the production efficiency is improved and the cost is reduced, and the product quality is improved.
Patent Information
- Application Number
- CN202422322697.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2025-08-12
- Estimated Expiration
- 2034-09-23
AI Technical Summary
Existing injection molds require manual cutting of gates after injection molding, resulting in low efficiency, damaged product quality and high labor costs.
An injection mold inscription device is designed, including mold kernel, cutter module, oil cylinder module and safety locking component, and automatically cut gates. The cutting tool module is driven by the oil cylinder module to cut gates after injection molding is completed, and the position is locked in the non-working state to prevent deviation.
Automatic gate cutting after injection molding is realized, which improves production efficiency, reduces production costs and improves product quality.
Smart Images
Figure CN223211832U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of injection molds, in particular to an internal cutting device of an injection mold. Background Art
[0002] With the continuous development of mold technology and the increasing popularity of injection molding automation, injection molding is now the most common method for producing automotive plastic parts and decorative components. In the injection molding process, the gate is the channel connecting the injection mold and the injection molding machine barrel, used to guide the molten plastic into the mold cavity. Mold gating systems using cold runners have different gate requirements depending on the plastic, product shape, and product function.
[0003] However, after injection molding is completed, the gate usually needs to be manually cut to separate the gate from the injection molded product. This process is not only inefficient, but may also damage the product, affecting product quality, while also increasing labor costs. Utility Model Content
[0004] In order to solve the technical defects raised in the above-mentioned background technology, the purpose of the present utility model is to provide an internal cutting device for an injection mold, which aims to solve the problem that the existing injection mold needs to manually cut the gate after injection molding, thereby improving production efficiency, reducing production costs and improving product quality.
[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0006] An internal cutting device for an injection mold comprises a mold core adapted to the product, and a cutter module disposed around the mold core. The cutter module is disposed within the injection mold and corresponds to the mold gate. One end of the cutter module is connected to a position adjustment assembly for adjusting the cutter height; the bottom of the position adjustment assembly is connected to a cylinder module for providing the power required for the cutting action; the cylinder module is in transmission connection with the position adjustment assembly to drive the cutter module to automatically cut the gate after injection molding is completed.
[0007] It also includes a safety locking component, which is connected to the position adjustment component. When the mold is in a non-working state, the safety locking component automatically locks the position adjustment component to limit the position of the cutting die from being offset.
[0008] Preferably, the cutter module includes a cutter push plate, a cutter seat, a cutter and a guide block. The bottom end of the cutter push plate is connected to the ejection mechanism in the mold. The cutter seat is superimposed on the cutter push plate, and the cutter seat and the two sides of the cutter push plate are fixedly connected by setting a cutter seat pressure block; one side of the cutter is set as a cutting blade for cutting the gate, and the cutter is vertically inserted between the cutter seat and the guide block.
[0009] Preferably, the end face shape of the cutting edge is set to be one of a rectangular end face, a semicircular end face or a rectangular end face with a chamfered angle.
[0010] Preferably, a plurality of spring holes are provided on the cutter seat, and an elastic reset member is provided in the spring hole. One end of the elastic reset member is connected to the spring hole, and the other end is in contact with the guide block, and the elastic reset member is a spring or a compression spring.
[0011] Preferably, a plurality of guide grooves are provided on the guide block, and the position adjustment assembly is slidably connected in the guide grooves.
[0012] Preferably, the position adjustment assembly includes a cutter adjustment jig and an adjustment screw. The cutter adjustment jig is located at the top of the cutter module, and a plurality of threaded holes are provided on the cutter adjustment jig. Each threaded hole is threadedly connected to an adjustment screw, and one end of one of the adjustment screws passes through the threaded hole and partially extends into the guide block.
[0013] Preferably, the oil cylinder module includes a hydraulic cylinder, an oil circuit and a connecting pipe. A pressure plate is fixedly connected to one side of the hydraulic cylinder. The oil circuit is connected to the hydraulic cylinder through the connecting pipe, and a sealing ring is provided between the oil circuit and the hydraulic cylinder.
[0014] Preferably, the safety locking assembly includes a locking block, a locking rod and a stop slider, one end of the locking block is connected to the locking rod, and the other end is connected to the stop slider, and one end of the locking rod abuts against the cutter adjustment fixture.
[0015] In summary, the beneficial effects of the present invention are as follows:
[0016] The injection mold internal cutting device of the present invention uses a cutter module. After the plastic part cools down, the cutter module is driven by the cylinder module to cut off the remaining injection gate, and the position of the cutter module relative to the gate is adjusted by setting a position adjustment component to ensure the accuracy and reliability of the cutting; thereby, automatic cutting of the gate is achieved after the injection molding is completed, avoiding manual operation, significantly improving production efficiency, reducing production costs, and improving product quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a structural diagram of the injection mold in the utility model;
[0018] Figure 2 It is a cross-sectional view of the injection mold in the utility model;
[0019] Figure 3 yes Figure 2 A magnified view of the structure at a in the middle;
[0020] Figure 4 This is a schematic structural diagram of the internal cutting device of the injection mold in the utility model;
[0021] Figure 5 This is a structural diagram of the mold core and the safety locking assembly of the utility model;
[0022] Figure 6 It is a top view of the mold core and the safety locking assembly in the utility model.
[0023] Description of reference numerals in the figures:
[0024] 1. Male mold; 2. Female mold; 3. Mold core; 4. Cutter mold assembly; 41. Cutter push plate; 42. Cutter seat; 421. Spring hole; 422. Cutter seat pressure block; 43. Cutter; 431. Cutting edge; 44. Guide block; 441. Guide groove; 45. Elastic reset member; 5. Position adjustment assembly; 51. Cutter adjustment fixture; 511. Threaded hole; 52. Adjusting screw; 6. Cylinder module; 61. Hydraulic cylinder; 62. Oil circuit; 63. Connecting pipe; 64. Sealing ring; 7. Safety locking assembly; 71. Locking block; 72. Locking rod; 73. Stop slider; 8. Gate. DETAILED DESCRIPTION
[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.
[0026] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms cannot be understood as limiting the present invention.
[0027] In the description of this utility model, if the word "several" or "several" is used, it means one or more, and "more" means two or more. "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the words "first," "second," and "third" is only for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, or implicitly indicating the number of the indicated technical features, or implicitly indicating the order of the indicated technical features.
[0028] The following is combined with Figure 1-6 , an embodiment of an internal cutting device of an injection mold of the utility model is further described in detail.
[0029] An internal cutting device for an injection mold, such as Figure 1 、 2 As shown, it includes a mold core 3 adapted to the product, and a cutter module 4 arranged around the mold core 3, the cutter module 4 is arranged inside the injection mold, and the cutter module 4 corresponds to the gate 8 of the mold. One end of the cutter module 4 is connected to a position adjustment component 5 for adjusting the height of the cutter 43; the bottom of the position adjustment component 5 is connected to a cylinder module 6 for providing the power required for the cutting action; the cylinder module 6 is connected to the position adjustment component 5 in a transmission connection to drive the cutter module 4 to automatically cut the gate 8 after the injection molding is completed; it also includes a safety locking component 7, the safety locking component 7 is connected to the position adjustment component 5, when the mold is in a non-working state, the safety locking component 7 automatically locks the position adjustment component 5 to limit the position of the cutter module 4 from being offset.
[0030] Specifically, during the operation of the mold internal cutting system, since the cutter module 4 needs to repeatedly perform ejection and retraction actions, if the assembly gap between the cutter module 4 and the mold is too large, the plastic will be squeezed into the assembly gap during the molding or ejection process of the cutter module 4 and produce burrs. The burrs in the assembly gap will increase the sliding resistance of the cutter module 4, causing the cutter module 4 to be unable to retract or retract inadequately. In severe cases, the cutter 43 will be stuck. Therefore, during installation, in order to improve the assembly accuracy of the cutter module 4 and the mold, the processing accuracy of the cutter module 4 is improved, and the precise fit between it and the mold is guaranteed.
[0031] At the same time, in order to enable the injection mold to automatically perform injection molding, the injection mold is connected to the in-mold hot-cutting hydraulic system using a circuit. The in-mold hot-cutting hydraulic system has a built-in time controller, which can adjust the injection time, the ejection time and the exit time of the cutter module 4 according to needs. At the same time, the injection mold is connected to the cylinder module 6 by setting an oil inlet hole and an exhaust hole, so that it can quickly intake oil or release pressure during the driving process; in addition, a touch hole switch is also connected to one side of the injection mold, and the touch switch is used to automatically control the opening and closing of the injection mold. When the mold is closed, it touches the touch switch, and the touch switch automatically transmits the signal to the time controller. The time controller outputs high-pressure oil to the cylinder module 6 according to the calculated time to drive the cutter module 4, thereby completing the internal cutting process.
[0032] In this embodiment, if Figure 3 、 4 As shown, the cutter module 4 includes a cutter push plate 41, a cutter seat 42, a cutter 43 and a guide block 44. The bottom end of the cutter push plate 41 is connected to the ejection mechanism in the mold, and the cutter seat 42 is superimposed on the cutter push plate 41, and the cutter seat 42 and the two sides of the cutter push plate 41 are fixedly connected by setting a cutter seat 42 pressure block; one side of the cutter 43 is set as a cutting blade 431 for cutting the gate 8, and the cutter 43 is vertically inserted between the cutter seat 42 and the guide block 44.
[0033] Specifically, a gap of 0.05-0.1 mm should be left between the cutting edge 431 of the cutter 43 and the mother mold 2. The purpose of this design is to avoid the cutter 43 from hitting the surface of the mother mold 2 during the cutting process, and to completely separate the injection molding runner and the product; at the same time, a 0.5-0.8 mm plane is also reserved between the product and the injection molding runner to form a slope with the plane of the cutter 43, so that the product is allowed to have a certain deformation space during injection molding; thereby ensuring that the product or runner is automatically separated without generating burrs, and also ensuring that one side of the mother mold 2 has sufficient strength.
[0034] It is worth noting that the cutting edge 431 of the present invention is beveled at 30 degrees toward the flow channel. This allows most of the excess plastic to be expelled into the flow channel during extrusion, reducing extrusion resistance. Furthermore, the end face of the cutting edge 431 is configured to be one of a rectangular end face, a semicircular end face, or a rectangular end face with a chamfered angle.
[0035] In this embodiment, a plurality of spring holes 421 are provided on the cutter seat 42, and an elastic return member 45 is provided in the spring hole 421. One end of the elastic return member 45 is connected to the spring hole 421, and the other end is in contact with the guide block 44, and the elastic return member 45 is a spring or a compression spring.
[0036] Specifically, the spring hole 421 in the cutter seat 42 is used to mount an elastic return member 45. Its purpose is to assist the cutting edge of the mold core 3 in cutting the sprue during mold opening, allowing for smooth separation of the product from the gate 8. Therefore, the mold core 3 and the insert within the male mold 1 must also be limited to allow space for movement between the insert and the mold core 3. When cutting the gate 8, the spring return member, acting upon the mold, retracts the ejected cutter 43 and the hydraulic cylinder, completing its reset and preparing for the next cut.
[0037] In this embodiment, a plurality of guide grooves 441 are provided on the guide block 44, and the position adjustment component 5 is slidably connected in the guide groove 441. The position adjustment component 5 includes a cutter adjustment fixture 51 and an adjustment screw 52. The cutter adjustment fixture 51 is located at the top of the cutter module 4, and a plurality of threaded holes 511 are provided on the cutter adjustment fixture 51. Each threaded hole 511 is threadedly connected to an adjustment screw 52, and one end of one adjustment screw 52 passes through the threaded hole 511 and partially extends into the guide block 44.
[0038] Specifically, the guide block 44 is arranged at the top of the cutter 43, and guide grooves 441 are provided on both sides of the guide block 44. The guide grooves 441 are arranged in parallel, and the guide grooves 441 can be fine-tuned according to the specific position and size of the gate 8 through the position adjustment component 5, thereby ensuring the precise alignment of the cutting blade 431 and the gate 8 and improving the cutting accuracy; at the same time, in order to facilitate the replacement of the position adjustment component 5, waist-shaped holes can be opened on both sides of the threaded hole 511. By utilizing the characteristics of the waist-shaped hole, the adjusting screw 52 can be fine-tuned in its installation position in the waist-shaped hole according to actual needs.
[0039] In this embodiment, the cylinder module 6 includes a hydraulic cylinder 61, an oil circuit 62 and a connecting pipe 63. A pressure plate is fixedly connected to one side of the cylinder. The oil circuit 62 is connected to the hydraulic cylinder 61 through the connecting pipe 63, and a sealing ring 64 (not shown in the figure) is provided between the oil circuit 62 and the hydraulic cylinder 61.
[0040] Specifically, the cylinder module 6 is a lateral cylinder, which is installed on the side wall of the injection mold. During the process of the cutter module 4 cutting the gate 8, the hydraulic cylinder 61 provides driving force and introduces hydraulic oil to the outside through the connecting pipe 63, so that the oil circuit 62 continuously outputs hydraulic oil into the cylinder. The hydraulic cylinder 61 is set at the bottom end of the position adjustment component 5, and is used to drive the cutter push plate 41 to move upward, and at the same time drive the cutter seat 42 and the cutter 43 to be pushed upward, and the cutter blade 43 on the top of the cutter 43 is used to complete the shearing of the gate 8; the sealing ring 64 (not shown in the figure) set between the oil circuit 62 and the hydraulic cylinder 61 is to improve the sealing effect and prevent the hydraulic oil from leaking and contaminating the injection mold.
[0041] In this embodiment, if Figure 5 、6 As shown, the safety locking assembly 7 includes a locking block 71, a locking rod 72 and a stop slider 73. One end of the locking block 71 is connected to the locking rod 72, and the other end is connected to the stop slider 73. One end of the locking rod 72 abuts against the cutter adjustment fixture 51.
[0042] If locking sill 75 , then lock core 71 is located in the state that stretches out the upside of latch 71, and latch lock 7 is in the state that stretches out the upside of latch 7, and lock core 71 is in the state that expands and contracts, and latch lock 7 is in the state that expands and contracts, and thus it is in the state that expands and contracts, and thus it is in the state that expands and contracts.
[0043] The working principle of this utility model:
[0044] During demolding, when the mold is closed, the contact switch is touched, and the contact switch transmits a signal to the time controller, which calculates the time; for example, it calculates when the cutter module 4 will be ejected, how long the cutter module 4 will be ejected, and when the cutter module 4 will be removed. At the same time, the cylinder module 6 uses the connecting pipe 63 and the oil circuit 62 to output high-pressure oil to the cylinder, which pushes the cutter 43 to be ejected, thereby using the sharp cutting edge 431 of the cutter 43 to cut the injection gate 8. The mold's built-in ejection mechanism then ejects the molded workpiece, completing demolding. When the product cools down for 2 seconds, the time controller releases pressure, and the spring return member is forced to the mold, retracting the cutter 43 and the cylinder, completing the reset. Repeating this action completes the next gate cutting 8 cycle.
[0045] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.
Claims
1. An internal cutting device for an injection mold, comprising a mold core adapted to the product, and a cutting die set arranged around the mold core, characterized in that: The cutter module is arranged inside the injection mold, and the cutter module corresponds to the gate position of the mold. One end of the cutter module is connected to a position adjustment component for adjusting the height of the cutter; the bottom of the position adjustment component is connected to a cylinder module for providing the power required for the cutting action; The oil cylinder module is in transmission connection with the position adjustment assembly to drive the cutter module to automatically cut the gate after the injection molding is completed; It also includes a safety locking component, which is connected to the position adjustment component. When the mold is in a non-working state, the safety locking component automatically locks the position adjustment component to limit the position of the cutting die from being offset.
2. The incision device of the injection mold according to claim 1, characterized in that: The cutter module includes a cutter push plate, a cutter seat, a cutter and a guide block. The bottom end of the cutter push plate is connected to the ejection mechanism in the mold. The cutter seat is superimposed on the cutter push plate, and the cutter seat and the two sides of the cutter push plate are fixedly connected by setting a cutter seat pressing block; one side of the cutter is set as a cutting blade for cutting the gate, and the cutter is vertically inserted between the cutter seat and the guide block.
3. The incision device of the injection mold according to claim 2, characterized in that: The end face shape of the cutting edge is set to be one of a rectangular end face, a semicircular end face or a rectangular end face with a chamfered angle.
4. The incision device of the injection mold according to claim 3, characterized in that: The cutter seat is provided with a plurality of spring holes, wherein elastic reset members are arranged in the spring holes, one end of the elastic reset member is connected to the spring hole, and the other end is in contact with the guide block, and the elastic reset member is a spring or a compression spring.
5. The incision device of the injection mold according to claim 4, characterized in that: The guide block is provided with a plurality of guide grooves, and the position adjustment assembly is slidably connected in the guide grooves.
6. The incision device of the injection mold according to claim 5, characterized in that: The position adjustment assembly includes a cutter adjustment jig and an adjustment screw. The cutter adjustment jig is located at the top of the cutter module, and a plurality of threaded holes are provided on the cutter adjustment jig. An adjustment screw is threadedly connected in each threaded hole. One end of one of the adjustment screws passes through the threaded hole and partially extends into the guide block.
7. The incision device of the injection mold according to claim 1, characterized in that: The oil cylinder module includes an oil cylinder, an oil circuit and a connecting pipe. A pressure plate is fixedly connected to one side of the oil cylinder. The oil circuit is connected to the oil cylinder through the connecting pipe, and a sealing ring is provided between the oil circuit and the oil cylinder.
8. The incision device of the injection mold according to claim 1, characterized in that: The safety locking assembly includes a locking block, a locking rod and a stop slider. One end of the locking block is connected to the locking rod, and the other end is connected to the stop slider. One end of the locking rod abuts against the cutter adjustment fixture.