In-mold cutting structure for injection molds

Abstract

The utility model relates to injection mold technical field especially relates to a kind of in-mold cutting structure of injection mold.The structure includes cutter assembly and heating assembly, the cutter assembly is horizontally installed between fixed mould assembly and movable mould assembly, and the heating assembly is installed on the cutter assembly;The cutter assembly includes driving mechanism, tool rest and cutter blade installed on tool rest, and the output end of driving mechanism is connected with tool rest;The heating assembly includes heating element installed on the tool rest, temperature sensor installed on the tool rest and temperature control box, and temperature control box is connected with heating element and temperature sensor.The utility model is by, and the cutter assembly is horizontally installed between fixed mould assembly and movable mould assembly, and heating element and temperature sensor are installed on cutter assembly, the temperature of cutter is accurately controlled, effectively solve the technical problem that cutting mechanism cutting gate is difficult to control temperature in the prior art, and the plastic around gate is easily affected by heat and appears flaw.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an in-mold cutting structure for injection molds. Background Technology

[0002] Injection molds are tools used for molding plastics. They utilize the thermoplastic or thermosetting properties of plastics to inject molten plastic into the mold cavity. After cooling and solidification, the resulting product has a specific shape and size. Currently, after the gate is cut, injection-molded products still require manual cutting, which is labor-intensive and costly.

[0003] To address the aforementioned issues, patent document CN209869307U discloses an in-mold cutting mechanism for gate allowance in injection molded products. This cutting mechanism includes an upper mold and a lower mold. An injection port is located on one side of the upper mold, and a heat storage tank is located on the side of the injection port within the upper mold. An electric heating plate is embedded inside the heat storage tank, and a wire groove is also located inside the upper mold. A mold groove is located on the upper surface of the lower mold, and a blade groove is located at the lower end of the lower mold. A blade mounting seat is installed inside the blade groove, and a blade is fixedly mounted on the blade mounting seat. A servo cylinder and a base plate are located below the lower mold. The upper end of the lead screw in the servo cylinder passes through the blade groove and is fixedly connected to the lower surface of the blade mounting seat. The servo cylinder is fixedly mounted on the upper surface of the base plate, and a power supply device is installed on the upper surface of the base plate on one side of the servo cylinder. A bracket is also fixedly welded to the upper surface of the base plate, and the upper end of the bracket is fixedly connected to the lower surface of the lower mold.

[0004] The aforementioned cutting mechanism first heats the gate using a heating plate to melt the solidified material at the gate. Then, a lead screw in a servo cylinder pushes the blade mounting seat upwards, causing the blade to move upwards and cut the material at the gate. While this cutting mechanism can achieve the desired cut, it still has the following problems: 1. Precise control of heating temperature and time is required during the heating process to ensure the plastic at the gate reaches a suitable softening state, which is difficult to control; 2. Heating the gate can easily cause heat-affected plastic around the gate, leading to defects on the surface of the injection molded part. Utility Model Content

[0005] This utility model provides an in-mold cutting structure for injection molds to solve the technical problems in the prior art where temperature control is difficult when the cutting mechanism cuts the gate, and the plastic around the gate is easily affected by heat, resulting in defects.

[0006] To solve the above problems, the in-mold cutting structure for injection molds provided by this utility model adopts the following technical solution:

[0007] An in-mold cutting structure for an injection mold includes a cutting blade assembly and a heating assembly. The cutting blade assembly is horizontally installed between a fixed mold assembly and a moving mold assembly, and the heating assembly is installed on the cutting blade assembly.

[0008] The cutting assembly includes a drive mechanism, a blade holder, and a cutting blade mounted on the blade holder, with the output end of the drive mechanism connected to the blade holder.

[0009] The heating assembly includes a heating element mounted on the tool holder, a temperature sensor mounted on the tool holder, and a temperature control box, with the temperature control box connected to the heating element and the temperature sensor.

[0010] The beneficial effects of the in-mold cutting structure for injection molds provided by this utility model are as follows: This utility model addresses the problem in existing technologies where the material at the gate is melted before cutting, leading to difficulty in temperature control at the gate and a tendency for defects to appear on the surface of the injection molded part. By horizontally installing a cutting assembly between the fixed mold assembly and the moving mold assembly, and installing a heating element and a temperature sensor on the cutting assembly, and connecting the heating element and temperature sensor to a temperature control box, the cutting assembly is heated by the heating element. The temperature sensor monitors the temperature of the cutting assembly and transmits the detected temperature information to the temperature control box, which then controls the heating element to heat the cutting assembly. After the cutting assembly is heated, the gate is cut. Precise temperature control during the cutting process can be achieved by precisely controlling the temperature of the cutting assembly, reducing the heat-affected zone of the injection molded part, and thus lowering the risk of defects caused by heat.

[0011] Through the above-mentioned design, this utility model effectively solves the technical problem in the prior art that the cutting mechanism is difficult to control the temperature when cutting the gate, and that the plastic around the gate is easily affected by heat and thus has defects.

[0012] Furthermore, a tool holder slide bar is installed on the tool holder, the cutting blade is installed on the tool holder slide bar, and a groove is provided on the moving mold assembly for the tool holder slide bar to slide.

[0013] Furthermore, the blade holder slide bar includes a first horizontal section and a second horizontal section connected to each other. The height of the first horizontal section is equal to the depth of the slide groove and greater than the height of the second horizontal section. The cutting blade is mounted on the second horizontal section.

[0014] Furthermore, the output end of the drive mechanism is connected to a tool holder assembly, and the tool holder is fixedly mounted on the tool holder assembly.

[0015] Furthermore, the tool holder assembly includes a tool holder fixing seat installed at the output end of the drive mechanism, and a tool holder extending horizontally toward the tool holder is provided on the tool holder fixing seat, and the tool holder is installed on the tool holder.

[0016] Furthermore, a sensing component is mounted on the side of the moving mold assembly to monitor the position of the cutting blade assembly.

[0017] Furthermore, the sensing component includes a first limit switch and a second limit switch spaced apart along the length direction of the tool holder, and a trigger for triggering the first limit switch and the second limit switch is mounted on the tool holder mounting base.

[0018] Furthermore, the cutter holder is equipped with an anti-rotation member that extends toward the cutting blade and is arranged parallel to the cutting blade to prevent the injection molded part in the cavity from rotating.

[0019] Furthermore, the anti-rotation component is a polyurethane rod.

[0020] Furthermore, a baffle is provided between the tool holder fixing seat and the driving mechanism, and the baffle is fixedly installed on the driving mechanism. Attached Figure Description

[0021] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0022] Figure 1 This utility model provides an application structural diagram of the in-mold cutting structure for injection molds. Figure 1 ;

[0023] Figure 2 for Figure 1 Enlarged view of part A in the middle

[0024] Figure 3 This utility model provides an application structural diagram of the in-mold cutting structure for injection molds. Figure 2 .

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Drive mechanism; 2. Tool holder; 3. Cutting blade; 4. Heating element; 5. Temperature sensor; 6. First horizontal section; 7. Second horizontal section; 8. Tool holder fixing seat; 9. Tool holder; 10. First limit switch; 11. Second limit switch; 12. Anti-rotation component; 13. Baffle; 14. Base plate; 15. Ejector pin base plate; 16. Ejector pin panel; 17. Support plate; 18. Moving template; 19. Push plate; 20. Spring; 21. Square iron; 22. Slide groove; 23. Injection molded product; 24. Anti-rotation component fixing seat; 25. Gate. Detailed Implementation

[0027] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0028] An embodiment of the in-mold cutting structure for injection molds provided by this utility model:

[0029] like Figures 1 to 3 As shown, the in-mold cutting structure of the injection mold includes a cutting assembly and a heating assembly. The cutting assembly is horizontally installed between the fixed mold assembly and the moving mold assembly, and the heating assembly is installed on the cutting assembly.

[0030] Regarding the cutting blade assembly: The cutting blade assembly includes a drive structure, a blade holder 2, and a cutting blade 3 mounted on the blade holder 2. The output end of the drive mechanism 1 is connected to the blade holder 2. The blade holder 2 has a sliding bar, and the cutting blade 3 is mounted on the sliding bar. The moving mold assembly has a groove 22 for the sliding bar of the blade holder 2 to slide.

[0031] Specifically, such as Figure 2 As shown, the slide bar of the blade holder 2 includes a first horizontal section 6 and a second horizontal section 7 connected to each other. The height of the first horizontal section 6 is equal to the depth of the slide groove 22 and greater than the height of the second horizontal section 7. The cutting blade 3 is installed on the second horizontal section 7.

[0032] Specifically, the output end of the drive mechanism 1 is connected to a tool holder 9 assembly, and the tool holder 2 is fixedly mounted on the tool holder 9 assembly. The tool holder 9 assembly includes a tool holder fixing seat 8 mounted on the output end of the drive mechanism 1, and a tool holder 9 extending horizontally toward the tool holder 2 is provided on the tool holder fixing seat 8, with the tool holder 2 mounted on the tool holder 9.

[0033] To facilitate monitoring of the position of the cutting blade assembly, a sensing component is installed on the side of the moving mold assembly. In this embodiment, the sensing component includes a first limit switch 10 and a second limit switch 11 spaced apart along the length of the blade holder 9, and a trigger for triggering the first limit switch 10 and the second limit switch 11 is installed on the blade holder mounting base 8.

[0034] In addition, a rotation-preventing member 12 extending toward and parallel to the cutting blade 3 is installed on the cutter holder 8 to prevent the injection molded part in the cavity from rotating; a baffle 13 is provided between the cutter holder 8 and the drive mechanism 1, and the baffle 13 is fixedly installed on the drive mechanism 1. In this embodiment, the rotation-preventing member 12 is a polyurethane rod.

[0035] Specifically, the tool holder fixing seat 8 is equipped with an anti-rotation component 12 fixing seat, and the anti-rotation component 12 is installed on the anti-rotation component fixing seat 24.

[0036] Regarding the heating assembly: The heating assembly includes a heating element 4 mounted on the tool holder 2, a temperature sensor 5 mounted on the tool holder 2, and a temperature control box, which is connected to the heating element 4 and the temperature sensor 5.

[0037] In this embodiment, the drive mechanism 1 is a hydraulic cylinder, the heating element 4 is a heating tube, the temperature sensor 5 is a thermocouple, and the number of cutting blades 3 is two, so as to cut off the gates 25 of two products at the same time.

[0038] It should be noted that the moving mold assembly includes, from bottom to top, a base plate 14, an ejector base plate 15, an ejector panel 16, a support plate 17, a moving mold plate 18, and a push plate 19. A spring 20 is provided between the ejector panel 16 and the support plate 17. A square iron 21 extending to the support plate 17 is provided on the base plate 14. A groove 22 is provided on the push plate 19. The length of the groove 22 is greater than the length of the slide bar of the tool holder 2 to form a clearance.

[0039] The working principle of the in-mold cutting structure for injection molds provided by this utility model is as follows:

[0040] First, assemble the cutter assembly and install it in the mold, ensuring that the position of the cutter corresponds to that of the gate 25. Connect the heating element 4 to the temperature control box and connect the temperature sensor 5 to the signal input terminal of the temperature control box.

[0041] Then, input the preset temperature range and heating power parameters into the temperature control box. After setting, start the temperature control box to put it into standby mode and wait to receive the temperature signal from the temperature sensor 5.

[0042] Then injection molding is performed. During the injection molding process, molten plastic enters the mold cavity through the side gate 25 to form the injection molded product 23. After the injection molding is completed, the mold enters the cooling stage. At this time, all components in the mold are in standby mode.

[0043] Once the mold has cooled to the point where the drainage pipe has solidified, the temperature control box is activated. The temperature control box outputs a corresponding current to the heating element 4 according to the preset temperature range, causing the cutting blade 3 to gradually heat up to the set temperature. When the temperature of the cutting blade 3 reaches the set value, the drive structure drives the cutter bar 9 to move, thereby moving the cutter holder 2, the cutter holder 2 slide bar, and the cutting blade 3. During the movement, the cutting blade 3 cuts off the gate 25 while heated, thus separating the gate 25 from the injection molded product 23. After the gate 25 is cut off, the mold can be opened and the injection molded product 23 can be removed.

[0044] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0045] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. An in-mold cutting structure for an injection mold, comprising a cutting blade assembly and a heating assembly, characterized in that, The cutting blade assembly is horizontally installed between the fixed mold assembly and the moving mold assembly, and the heating assembly is installed on the cutting blade assembly; The cutting assembly includes a drive mechanism, a blade holder, and a cutting blade mounted on the blade holder, with the output end of the drive mechanism connected to the blade holder. The heating assembly includes a heating element mounted on the tool holder, a temperature sensor mounted on the tool holder, and a temperature control box, with the temperature control box connected to the heating element and the temperature sensor.

2. The in-mold cutting structure of the injection mold according to claim 1, characterized in that, The tool holder is equipped with a tool holder slide bar, the cutting blade is mounted on the tool holder slide bar, and the moving mold assembly has a groove for the tool holder slide bar to slide.

3. The in-mold cutting structure of the injection mold according to claim 2, characterized in that, The blade holder slide includes a first horizontal section and a second horizontal section connected to each other. The height of the first horizontal section is equal to the depth of the slide groove and greater than the height of the second horizontal section. The cutting blade is mounted on the second horizontal section.

4. The in-mold cutting structure of the injection mold according to any one of claims 1 to 3, characterized in that, The output end of the drive mechanism is connected to a tool holder assembly, and the tool holder is fixedly mounted on the tool holder assembly.

5. The in-mold cutting structure of the injection mold according to claim 4, characterized in that, The tool holder assembly includes a tool holder mounting base installed at the output end of the drive mechanism, and a tool holder extending horizontally toward the tool holder is provided on the tool holder, and the tool holder is mounted on the tool holder.

6. The in-mold cutting structure of the injection mold according to claim 5, characterized in that, The moving mold assembly has a sensing component mounted on its side to monitor the position of the cutting blade assembly.

7. The in-mold cutting structure of the injection mold according to claim 6, characterized in that, The sensing component includes a first limit switch and a second limit switch spaced apart along the length of the tool holder, and a trigger for triggering the first limit switch and the second limit switch is installed on the tool holder mounting base.

8. The in-mold cutting structure of the injection mold according to claim 5, characterized in that, The cutter holder is equipped with an anti-rotation element that extends toward the cutting blade and is arranged parallel to the cutting blade to prevent the injection molded part in the cavity from rotating.

9. The in-mold cutting structure of the injection mold according to claim 8, characterized in that, The anti-rotation component is a polyurethane rod.

10. The in-mold cutting structure of the injection mold according to claim 5, characterized in that, A baffle is provided between the tool holder fixing seat and the driving mechanism, and the baffle is fixedly installed on the driving mechanism.

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