An injection mold

Abstract

The present invention provides an injection mold, which belongs to the field of mold technology. It solves the problem that the joint position of the injection molded product is prone to molding defects, resulting in poor product quality. The injection mold includes a mold body, the mold body has a cavity and a parting surface, the parting surface is provided with a plurality of embedded grooves arranged along the edge of the cavity, each embedded groove is embedded with a heating wire, and each embedded groove includes a main body section arranged in a strip shape along the edge of the cavity, and each main body section on the parting surface has ventilation grooves separated from the heating wire and arranged along the edge of the cavity at both ends, and the ventilation grooves are connected to the embedded grooves and communicate with the outside world. The structure at the parting surface of the injection mold is conducive to uniform temperature distribution at the edge of the cavity, so that the joint position of the injection molded product is heated evenly, molding defects are reduced, and product quality is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of molds and relates to an injection mold. Background Art

[0002] With the development of the automotive industry, car designs are no longer monotonous, and the design of automotive lampshades is also becoming increasingly diverse, with multi-color lampshades being one of the development trends. Most automotive lampshades are injection molded using a mold consisting of a fixed mold and a movable mold. The fixed and movable molds are joined to form a cavity, within which the lampshade is molded. The interface between the fixed and movable molds is the parting surface, located outside the cavity. Multi-color lampshades are typically injection molded using multiple sets of corresponding molds, each mold forming a different color. For example, during the production of a two-color lampshade, the first portion of the structure (the first color) is molded in the first mold. This first portion is then transferred to the second mold, where the second portion (the second color) is molded directly onto the first portion. The boundary between the second portion and the first portion forms a joint.

[0003] To achieve uniform mold temperature and reduce molding defects, a common method is to install water channels within the mold, which deliver hot water or steam for heating. For example, a Chinese patent document discloses an SMC hot press mold [Announcement No.: CN101733891B], which includes an upper mold and a lower mold. The upper and lower molds form a mold cavity, which is provided with a molding surface for the product. The upper or lower mold is equipped with a heating system to ensure uniform heating of the molding surface. The heating system consists of several water wells, with the deepest point of each well being the same distance from the molding surface. The water wells are connected in series to achieve the operating temperature.

[0004] Due to limitations in existing processing techniques, the water well structure can generally only be machined by drilling straight holes. For molding surfaces designed to accommodate the complex, multi-curved structures of two-color lampshades, the water well structure often cannot be arranged to adapt to the shape of the molding surface, resulting in uneven temperature distribution on the molding surface (especially along the edge of the cavity). When injection molding the second part of the two-color lampshade, uneven temperatures at the edge of the mold cavity can create a false bond at the joint of the two-color lampshade, which can appear as bright lines or bright spots at the joint, or even cracks.

[0005] To improve the temperature uniformity of the molding surface, the density of water wells can be increased along the edges of the molding surface. However, this increased density weakens the mold's structural strength, compromising its stability. Alternatively, a modular mold can be configured to match the shape of the molding surface, as described in patent publication CN105058730A. However, this approach adds at least two molding surfaces to the mold, significantly increasing its manufacturing cost. Summary of the Invention

[0006] The purpose of the present invention is to address the above-mentioned problems existing in the prior art and to propose an injection mold to solve the technical problem that molding defects are easily generated at the joint position of the existing injection molded products, resulting in poor product quality.

[0007] The purpose of the present invention can be achieved through the following technical solutions:

[0008] An injection mold includes a mold body, which has a cavity and a parting surface. The mold body is characterized in that a plurality of embedding grooves arranged along the edge of the cavity are opened on the parting surface, a heating wire is embedded in each embedding groove, and each embedding groove includes a strip-shaped main body section arranged along the edge of the cavity. Ventilation grooves are separated from the heating wire and arranged along the edge of the cavity at both ends of each main body section on the parting surface. The ventilation grooves are connected to the embedding grooves and communicate with the outside world.

[0009] Water heating can be retained on the mold body, and heating wires can be installed in the grooves on the parting surface for supplementary heating. The grooves are arranged along the edge of the cavity, and the main section of the grooves is arranged in a strip shape along the edge of the cavity, so that the heat generated by the heating wires can be distributed along the edge of the cavity; the heat generated by the heating wires is not only transmitted to the mold body, but also heats the air in the grooves. For locations where there are no heating wires on the outside of the grooves at both ends, due to the presence of ventilation grooves, the air in the grooves will flow out of the grooves after being heated and flow along the ventilation grooves. The hot air brings some of the heat generated by the heating wires to supplement heating the edge of the cavity near the ventilation grooves, while also preventing local overheating at the grooves. Therefore, the structure at the parting surface of this injection mold is conducive to uniform temperature distribution at the edge of the cavity, so that the joints of the injection molded products are evenly heated, reducing molding defects and improving product quality.

[0010] Furthermore, the embedding grooves and vent grooves are located on the parting surface and can be formed by milling or direct casting. This significantly reduces mold manufacturing costs and processing complexity, while also minimizing the impact on the overall structural strength of the mold body. Furthermore, the vent grooves channel and exhaust hot air from the embedding grooves, preventing it from entering the mold cavity and causing defects in the product.

[0011] In the above-mentioned injection mold, the cavity is strip-shaped, and a plurality of embedding grooves are provided on both sides of the cavity. On the parting surface on the same side of the cavity, the vent grooves between two adjacent embedding grooves are connected to form a whole.

[0012] Multiple slots are provided on the parting surface, that is, these slots are arranged separately on the parting surface, so that heating wires of different powers can be placed in each slot according to needs. The heat generated by the heating wires in two adjacent slots can be combined through the interconnected ventilation slots, which is conducive to improving temperature uniformity and enhancing product quality.

[0013] In the above-mentioned injection mold, the heating wire is a variable diameter structure, and the diameter of the heating wire is proportional to the distance from the axis of the heating wire to the parting surface.

[0014] Under the condition of the same heat source power, the farther away from the heat source, the lower the temperature. The larger the diameter of the heating wire, the smaller the resistance of the heating wire. Under the condition of the same heating wire voltage, the larger the diameter of the heating wire, the greater the power. In other words, the larger the diameter of the heating wire, the greater the heat generated. Because the diameter of the heating wire is proportional to the distance from the axis of the heating wire to the parting surface, the temperature generated by the heat generated by the large diameter heating wire and the heat generated by the small diameter heating wire at the edge of the cavity can be roughly the same. This can better achieve a more uniform temperature distribution at the edge of the cavity.

[0015] In the aforementioned injection mold, each slot opening is covered with a heat shield. This shield reduces the heat generated by the heating wire from radiating outward from the slot opening, ensuring that the heating wire heats the cavity edges. Furthermore, the shielding effect of the heat shield allows heated air in the slot to flow along the slot and toward the ventilation groove, contributing to temperature uniformity at the cavity edges.

[0016] In the above-mentioned injection mold, the heat insulation board is located in the embedding groove and the surface of the heat insulation board facing away from the embedding groove is lower than the parting surface. Several edge grooves 1 are provided on the parting surface between the embedding groove main body section and the cavity. The edge grooves 1 connect the embedding groove and the cavity. The bottom surface of the edge groove 1 is located between the parting surface and the heat insulation board. An exhaust channel 1 connecting the embedding groove and the outside world is provided on the side of the embedding groove main body section away from the cavity.

[0017] That is to say, the bottom surface of the groove one is lower than the parting surface but higher than the insulation board, and the groove one connects the cavity and the embedded groove. In this way, during the injection molding process, the air in the cavity can be discharged from the cavity through the groove one, the embedded groove and the exhaust channel one in sequence, and the discharged air is separated from the heating wire by the insulation board, so that the air discharged from the cavity does not take away the heat generated by the heating wire, thereby ensuring the heating effect of the heating wire on the edge of the cavity, reducing the molding defects at the joint position of the injection molded product, and improving product quality.

[0018] In the above-mentioned injection mold, a second groove is provided on the parting surface between the vent groove and the cavity, and the second groove connects the vent groove and the cavity. A second exhaust channel connecting the vent groove and the outside world is provided on the side of the vent groove away from the cavity.

[0019] During the injection molding process, the air in the cavity can also be discharged from the cavity through the second groove, the vent groove and the second exhaust channel in sequence. The mold body is in an overall heating state during injection molding, and the air in the cavity will also be heated. In this way, the air in the cavity can bring some heat from other positions of the cavity when passing through the second groove and the vent groove, which has the effect of supplementary heating the position near the vent groove, which is beneficial to improve the temperature uniformity at the edge of the cavity and improve product quality.

[0020] In the above-mentioned injection mold, each embedding groove further includes two extension sections arranged in a direction away from the cavity and respectively connected to the two ends of the main section, and both ends of each heating wire extend from the two extension sections of the corresponding embedding groove.

[0021] The extension not only allows the ends of the heating wire to extend beyond the mold body, but also guides the hot air in the slot to flow along the slot and out through the extension, helping to even out the temperature at the edge of the cavity. This also prevents localized overheating in the slot and prevents hot air from entering the cavity, potentially impacting product quality. Furthermore, the heat generated by the heating wire in the extension is more quickly transferred to the vent slot, further heating the cavity edge near the vent slot and improving temperature uniformity along the edge.

[0022] In the above-mentioned injection mold, there is a gap between the heating wire and the heat insulation plate, and there is a gap between the bottom surface of the ventilation groove and the heat insulation plate.

[0023] The existence of the gap is conducive to the circulation and guidance of air in the embedded groove. The existence of the gap allows the air heated by the heating wire to enter the ventilation groove from the embedded groove. The existence of the gap and the gap are both conducive to the uniformity of the temperature at the edge of the cavity.

[0024] In the above-mentioned injection mold, a plurality of temperature detection positions are provided on the parting surface. The temperature detection positions are provided in a one-to-one correspondence with the embedding grooves, and the temperature detection positions are located on the side of the embedding groove main section away from the mold cavity.

[0025] A temperature sensor is installed at the temperature detection position to detect the temperature at the parting surface. The temperature sensor transmits the detected temperature to the controller. The controller controls the power on and off of the heating wire according to the detected temperature, thereby regulating the temperature at the parting surface to avoid local excessive temperature, which is conducive to ensuring temperature uniformity.

[0026] In the above-mentioned injection mold, overflow ports are provided at both ends of the cavity on the parting surface. The overflow ports are used to accommodate the excess material during injection molding to ensure product quality.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] Embossed grooves and vents are provided on the parting surface. The main body of the embedding groove and the vent are located along the edge of the cavity. Heating wires of different powers can be embedded in the embedding groove to ensure uniform heating at the edge of the cavity, reduce molding defects at the joint of the injection molded product, and improve product quality. The use of thermal insulation panels to separate the heating wire from the air discharged from the cavity ensures the heating effect of the heating wire and the heat dispersion effect brought by the hot air flow in the embedding groove and vent, which helps to ensure uniform temperature at the edge of the cavity and improve product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a three-dimensional diagram of the first embodiment of the injection mold.

[0030] Figure 2 yes Figure 1 A partial three-dimensional image of the hidden heat shield at point A in the middle.

[0031] Figure 3 yes Figure 1 Partial cross-sectional view of the middle BB (embedded groove).

[0032] Figure 4 yes Figure 1 Partial cross-sectional view of the CC (ventilation groove) in the middle.

[0033] Figure 5 yes Figure 1 Partial cross-sectional view of the middle DD (where the embedding groove and the vent groove are connected).

[0034] Figure 6 It is a design method of this injection mold.

[0035] In the figure, 1. mold body; 1a. cavity; 1b. parting surface; 1c. overflow port; 1d. positioning groove; 1e. positioning hole; 1f. positioning ridge; 2. embedding groove; 2a. main section; 2b. extension section; 2c. shoulder; 3. heating wire; 4. mounting groove; 5. heat insulation board; 5a. fixing part; 6. fixing groove; 7. ventilation groove; 8. gap; 9. clearance; 10. along groove one; 11. exhaust channel one; 12. along groove two; 13. exhaust channel two; 14. temperature detection position. DETAILED DESCRIPTION

[0036] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0037] Example 1

[0038] like Figure 1As shown, an injection mold is used for injection molding injection products (such as the second part structure of a two-color lampshade), including a mold body 1. The mold body 1 in the figure is the fixed mold of the injection mold. The mold body 1 has a cavity 1a and a parting surface 1b. The parting surface 1b is located on the outside of the cavity 1a. The surface on the mold body 1 located at the cavity 1a is the molding surface, and the position of the edge of the cavity 1a is also the position of the edge of the molding surface. The mold body 1 in the figure has a strip-shaped cavity 1a according to the structure of the two-color lampshade, that is, the molding surface is a strip-shaped curved surface, and the two ends of the molding surface are upwardly tilted, and overflow ports 1c are provided on the parting surface 1b at both ends of the cavity 1a. A water channel is provided in the mold body 1 below the cavity 1a and the parting surface 1b. When the injection mold is working, hot water or steam is generally passed into the water channel to heat the mold body 1. The parting surface 1b is provided with a positioning groove 1d, a positioning hole 1e and a positioning ridge 1f for positioning with the movable mold. The cavity 1a, the positioning groove 1d, the positioning hole 1e and the positioning ridge 1f are all existing structures. Figure 1 Arrangement shown.

[0039] like Figure 1 、 Figure 2 and Figure 3As shown, the parting surface 1b is provided with several slots 2 arranged sequentially along the edge of the cavity 1a. Each slot 2 houses a heating wire 3. The slots 2 comprise a strip-shaped main section 2a extending along the edge of the cavity 1a. The slots 2 also include two extensions 2b extending away from the cavity 1a and connected to the ends of the main section 2a. Each heating wire 3 extends from one of the two extensions 2b of the corresponding slot 2. To facilitate connection of the heating wire 3 to a power source, a rectangular mounting groove 4 is provided on the parting surface 1b at the outer ends of the extensions 2b. The mounting groove 4 is wider and deeper than the slot 2, and the ends of the heating wire 3 extend into the mounting groove 4. In the cross-sectional structure of the slots 2, the side surfaces of the slots 2 are parallel to each other, and the bottom surface of the slots 2 is arc-shaped. Along the length of the main section 2a, the distance from the edge of the cavity 1a to the center plane of the main section 2a is uniform, which facilitates temperature uniformity along the edge of the cavity 1a. The cross-sectional structure of the heating wire 3 is circular. The heating wire 3 is embedded in the slot 2, and the bottom side of the heating wire 3 is aligned with the bottom surface of the slot 2. The heating wire 3 has a variable diameter structure, and the diameter of the heating wire 3 is proportional to the distance from the axis of the heating wire 3 to the parting surface 1b. The notch of each slot 2 is covered and fixed with a heat insulation board 5, which is located within the slot 2. The edge of the slot 2 is provided with a notch, and shoulders 2c are formed on both sides of the slot 2. The heat insulation board 5 is embedded in the notch, and the two sides of the heat insulation board 5 abut against the shoulders 2c. The shoulders 2c not only position the heat insulation board 5, but also form a seal when the shoulders 2c abut against the heat insulation board 5, thereby isolating the heating wire 3 from the notch of the slot 2, preventing the air around the heating wire 3 from mixing with the air at the notch of the slot 2. The surface of the insulation board 5 facing away from the insert groove 2 is lower than the parting surface 1b. That is, the distance from the shoulder 2c to the parting surface 1b is greater than the thickness of the insulation board 5. To secure the insulation board 5, a fixing portion 5a is formed by a protruding projection on the side of the insulation board 5 facing away from the mold cavity 1a. A fixing groove 6 corresponding to the fixing portion 5a is defined on the parting surface 1b. The fixing portion 5a is inserted into the fixing groove 6 and secured with screws or bolts. Each insulation board 5 has at least two fixing portions 5a. Longer insulation boards 5 may also have three or four fixing portions 5a.

[0040] like Figure 1 、 Figure 2 and Figure 4 As shown, on the parting surface 1b, at both ends of the main section 2a of each embedding groove 2, there are ventilation grooves 7 separated from the heating wire 3 and arranged along the edge of the cavity 1a. The ventilation grooves 7 are connected to the embedding groove 2 and communicate with the outside world. There are multiple embedding grooves 2 on both sides of the cavity 1a. Figure 1As shown in the figure, three embedding grooves 2 are respectively provided on both sides of the cavity 1a. On the parting surface 1b on the same side of the cavity 1a, the vent groove 7 located between two adjacent embedding grooves 2 is connected and integrated. In the cross-sectional structure of the vent groove 7, the vent groove 7 is in the shape of an arc, and the position of the vent groove 7 farther from the parting surface 1b is the bottom surface of the vent groove 7. Figure 3 and Figure 4 As shown, the distance from the edge of the cavity 1a to the center plane of the main section 2a of the embedding groove 2 is D1, and the distance from the edge of the cavity 1a to the center plane of the ventilation groove 7 is d1. D1 and d1 are equal. This arrangement facilitates processing and is conducive to uniform temperature at the edge of the cavity 1a.

[0041] like Figure 3 、 Figure 4 and Figure 5 As shown, a gap 8 is provided between the heating wire 3 and the insulation board 5, and a gap 9 is provided between the bottom surface of the ventilation groove 7 and the insulation board 5. These gaps 8 and 9 allow for air circulation. Several longitudinal grooves 10 are provided on the parting surface 1b, located between the main section 2a of the insert 2 and the cavity 1a. The longitudinal grooves 10 corresponding to the same main section 2a are arranged sequentially along the edge of the cavity 1a. The longitudinal grooves 10 connect the main section 2a of the insert 2 with the cavity 1a. The bottom surface of the longitudinal groove 10 is located between the parting surface 1b and the insulation board 5, i.e., the bottom surface of the longitudinal groove 10 is lower than the parting surface 1b but higher than the surface of the insulation board 5 facing away from the insert 2. An exhaust channel 11 is provided on the parting surface 1b, located on the side of the main section 2a of the insert 2 away from the cavity 1a, connecting the insert 2 with the outside world. The exhaust channel 11 comprises an exhaust groove 1 connected to the main section 2a, and the cross-section of the exhaust groove 1 is circular. Each main section 2a is provided with several exhaust grooves 1, and these exhaust grooves 1 are arranged in sequence along the length direction of the main section 2a. A longitudinal groove 12 is provided on the parting surface 1b between the vent groove 7 and the cavity 1a, and the longitudinal groove 12 connects the vent groove 7 and the cavity 1a. The structure of the longitudinal groove 12 is the same as that of the longitudinal groove 10, both of which are rectangular grooves. An exhaust channel 2 13 connecting the vent groove 7 with the outside world is provided on the side of the vent groove 7 away from the cavity 1a on the parting surface 1b. The exhaust channel 2 13 includes an exhaust groove 2 connected to the vent groove 7, and the cross-section of the exhaust groove 2 is in the shape of a circular arc.

[0042] like Figure 1 and Figure 2As shown, several temperature detection positions 14 are provided on the parting surface 1b. The temperature detection positions 14 are provided in a one-to-one correspondence with the heating wires 3. The temperature detection positions 14 are located on the side of the main section 2a of the embedding groove 2 away from the cavity 1a. A temperature sensor is installed on the temperature detection position 14 to detect the temperature at the parting surface 1b. The temperature sensor transmits the detected temperature to the controller. The controller controls the power on and off of the heating wire 3 according to the detected temperature, thereby regulating the temperature at the parting surface 1b, avoiding local excessive temperature, and ensuring temperature uniformity. The distance from the temperature sensor to the axis of the heating wire 3 is roughly the same as the distance from the edge of the cavity 1a to the axis of the heating wire 3. In this way, the temperature detected by the temperature sensor can be roughly the same as the temperature at the edge of the cavity 1a.

[0043] When the injection mold is working, hot water or steam is introduced into the water channel and the heating wire 3 is energized. The two work together to heat the mold body 1. When the heating wire 3 is energized, the heat generated by the heating wire 3 is transferred to the edge of the cavity 1a to heat the junction between the first and second parts of the two-color lampshade, so that the junction between the first and second parts is integrated and fused. The heating wire 3 in each slot 2 has different power and is a variable diameter structure. At the same time, the main section 2a of the slot 2 extending along the edge of the cavity 1a and the ventilation groove 7 are used to allow the heated air in the slot 2 to flow and disperse the heat. The temperature is then controlled by the controller and the temperature stabilizer sensor, which can make the temperature at the edge of the cavity 1a more uniform, reduce the formation defects such as bright lines, bright spots, and even cracks between the junctions of the two-color lampshade, and improve the processing quality of the product. The injection mold is also provided with a heat insulation board 5 at the notch of the embedding groove 2, and the groove 10 on the parting surface 1b is arranged higher than the heat insulation board 5, so that the heating wire 3 is separated from the air discharged from the cavity 1a, reducing the possibility that the heat generated by the heating wire 3 is carried away by the air flowing out of the cavity 1a. At the same time, it also ensures that the hot air under the heat insulation board 5 can flow along the embedding groove 2 and the ventilation groove 7 to disperse the heat, which is conducive to better uniformity of the temperature at the edge of the cavity 1a.

[0044] like Figure 6 As shown, the injection mold can be set up by the following design method, and the steps of the design method include:

[0045] S1. Determine the heating zone: According to the location of the molding defect at the joint of the product, find the corresponding location of the injection mold cavity 1a and determine it as the heating zone.

[0046] The area of the heating zone is larger than the area of the molding defect, so as to facilitate the uniformity of the temperature at the edge of the cavity 1a after heat diffusion, and avoid the emergence of new molding defects at other locations after the original molding defect disappears.

[0047] S2, setting the embedding groove 2 and the heating wire 3: Figure 1 、 Figure 2 and Figure 3 As shown, several embedding grooves 2 are arranged in sequence along the edge of the cavity 1a on the parting surface 1b. The embedding grooves 2 correspond to the heating zones one by one. Each embedding groove 2 includes a strip-shaped main body section 2a arranged along the edge of the cavity 1a.

[0048] Along the length of the main body section 2a, the distance from the edge of the cavity 1a to the center plane of the main body section 2a is the same. The distance from the edge of the cavity 1a to the center plane of the main body section 2a is D1, which is generally 10mm-15mm, and can be 11mm, 12mm, 13mm or 14mm.

[0049] A heat shield 5 is secured to the opening of each slot 2. The heat shield 5 is positioned within the slot 2, with the surface of the heat shield 5 facing away from the slot 2 lower than the parting surface 1b. A notch is formed at the edge of the slot 2, and shoulders 2c are formed on both sides of the slot 2. The heat shield 5 fits into the notch, with both sides of the heat shield 5 resting against the shoulders 2c. The thickness of the heat shield 5 ranges from 0.8mm to 1.2mm, and can be set to 1.0mm. The distance from the shoulders 2c to the parting surface 1b is greater than the thickness of the heat shield 5, typically ranging from 0.5mm to 1.0mm, and can be set to 0.75mm. A gap 8 is provided between the heating wire 3 and the heat shield 5. The gap 8 ranges from 0.1mm to 1.2mm, and can be set to 0.25mm, 0.55mm, 0.75mm, or 1.05mm, among others. The side of the heat shield 5 facing away from the mold cavity 1a protrudes outward to form a fixing portion 5a. A fixing groove 6 corresponding to the fixing portion 5a is defined on the parting surface 1b. The fixing portion 5a is inserted into the fixing groove 6 and secured with screws or bolts. The depth of the fixing groove 6 is the same as the height from the shoulder 2c to the parting surface 1b. The size of the fixing portion 5a and the fixing groove 6 should be sufficient to accommodate M6 or M8 screws or bolts. The number and location of the fixing portions 5a should be sufficient to ensure stable and secure fixation of the heat shield 5.

[0050] When multiple slots 2 are provided, each slot 2 can be fitted with a heating wire 3 of varying power. The power of the heating wire 3 is determined by the severity of the molding defect at the product joint. The more severe the molding defect, the higher the power of the heating wire 3. For severe molding defects, such as cracks, a high-power heating wire 3 can be selected. For less severe molding defects, such as bright spots, a low-power heating wire 3 can be selected.

[0051] The heating wire 3 can be a variable diameter structure, and the diameter of the heating wire 3 is proportional to the distance from the axis of the heating wire 3 to the parting surface 1b. For example, according to the power of the heating wire 3, the diameter of the heating wire 3 is 6mm, and the distance from the axis of the heating wire 3 to the parting surface 1b is 5mm; when the diameter of the heating wire 3 is 8.4mm, the distance from the axis of the heating wire 3 to the parting surface 1b is 7mm. The proportional coefficient between the diameter of the heating wire 3 and the distance from the axis of the heating wire 3 to the parting surface 1b can be adjusted as needed, but it is necessary to ensure that there is a gap 8 between the insulation board 5 and the heating wire 3. The diameter of the heating wire 3 is generally larger at the position facing the molding defect, thereby generating more heat.

[0052] Each slot 2 also includes two extensions 2b, located away from the mold cavity 1a and connected to the ends of the main section 2a. Each heating wire 3 extends from one of the two extensions 2b of the corresponding slot 2. A mounting groove 4 is provided on the parting surface 1b, located at the outer ends of the extensions 2b. The mounting groove 4 extends through the outer side of the mold body 1, and the ends of the heating wires 3 extend into the mounting groove 4. The mounting groove 4 is rectangular in shape, with a width and depth greater than that of the slot 2, facilitating connection of the heating wires 3 to a power source.

[0053] S3, set the ventilation groove 7: Figure 1 、 Figure 2 and Figure 4 As shown, ventilation grooves 7 are provided on the parting surface 1b at both ends of the main section 2a of each caulking groove 2, separated from the heating wire 3 and arranged along the edge of the cavity 1a. The ventilation grooves 7 are connected to the caulking grooves 2 and communicate with the outside world. The ventilation grooves 7 between two adjacent caulking grooves 2 are connected and integrated.

[0054] Along the length of the vent groove 7, the distance from the edge of the cavity 1a to the center plane of the vent groove 7 is the same, and the distance from the edge of the cavity 1a to the center plane of the vent groove 7 is d1. The distance from the edge of the cavity 1a to the center plane of the vent groove 7 is the same as the distance from the edge of the cavity 1a to the center plane of the main body section 2a, that is, D1 = d1. The depth of the vent groove 7 is greater than the distance from the shoulder 2c to the parting surface 1b. It is necessary to ensure that a gap 9 is set between the bottom surface of the vent groove 7 and the insulation board 5. The depth of the vent groove 7 is 1.6mm-2.5mm, and can be set to 2.0mm. The width of the vent groove 7 is 5.0mm-6.0mm, and can be set to 5.5mm.

[0055] S4. Set up the exhaust structure: Figure 1 、 Figure 2 and Figure 5As shown, several first-edge grooves 10 are provided on parting surface 1b between the main section 2a of the embedding groove 2 and the mold cavity 1a. These grooves 10 connect the main section 2a of the embedding groove 2 with the mold cavity 1a. The bottom surface of the first-edge groove 10 is located between the parting surface 1b and the heat insulation board 5. An exhaust channel 11 is provided on the side of the main section 2a of the embedding groove 2 away from the mold cavity 1a, connecting the embedding groove 2 with the outside world. A second-edge groove 12 is provided on parting surface 1b between the vent groove 7 and the mold cavity 1a. The second-edge groove 12 connects the vent groove 7 with the mold cavity 1a. An exhaust channel 2 13 is provided on the side of the vent groove 7 away from the mold cavity 1a, connecting the vent groove 7 with the outside world.

[0056] The structure of the first and second grooves 10 and 12 is identical. The depth of the first groove 10, i.e., the distance from the bottom of the first groove 10 to the parting surface 1b, is less than the difference between the distance from the shoulder 2c to the parting surface 1b and the thickness of the thermal insulation board 5. The depth of the first groove 10 is generally 0.1mm-0.5mm, and can be 0.15mm. The width of the first groove 10, i.e., the distance between the two sides of the first groove 10, is 5mm-8mm, and can be set to 6mm. The number of the first and second grooves 10 and 12 is generally designed based on the volume of the cavity 1a to ensure that air in the cavity 1a can be expelled as quickly as possible through the first and second grooves 10 and 12.

[0057] Exhaust channel 11 includes an exhaust groove 1 connected to the main section 2a, and the cross-sectional shape of the exhaust groove 1 is an arc shape. Each main section 2a is provided with several exhaust grooves 1, and these exhaust grooves 1 are arranged in sequence along the length direction of the main section 2a. Exhaust channel 2 13 includes an exhaust groove 2 connected to the vent groove 7, and the cross-sectional shape of the exhaust groove 2 is an arc shape. The depth and width of exhaust groove 1 are the same as those of the vent groove 7, and the depth and width of exhaust groove 2 are the same as those of the vent groove 7. Exhaust groove 1 and exhaust groove 2 can pass through the outer side surface of the mold body 1, and can also pass through the fixing groove 6, the mounting groove 4, the positioning groove 1d, the positioning ridge 1f and other structures to ensure communication with the outside world.

[0058] S5, set the temperature detection bit 14: Figure 1 and Figure 2 As shown, several temperature sensing points 14 are provided on the parting surface 1b. Each temperature sensing point 14 corresponds to a heating wire 3. The temperature sensing points 14 are located on the side of the main section 2a of the insert 2 away from the mold cavity 1a. Each temperature sensing point 14 is equidistant from the center plane of the corresponding main section 2a of the insert 2. The temperature sensing points 14 should be positioned away from the fixing groove 6, the positioning groove 1d, the positioning hole 1e, the mounting groove 4, and the like.

[0059] Example 2

[0060] The structure of cavity 1a differs from that of Example 1. Cavity 1a is roughly trapezoidal, with several slots 2 arranged around it. The main section 2a of the slot 2 is arranged in a strip shape along the edge of cavity 1a, with two extension sections 2b connected to each end of the main section 2a. A heating wire 3 is embedded in each slot 2, with the ends of each heating wire 3 extending from the two extension sections 2b of the corresponding slot 2. A vent 7 is provided on the parting surface 1b between two adjacent slots 2, connecting them. The vent 7 is separated from the heating wire 3 and arranged along the edge of cavity 1a. The main section 2a and the vent 7 form an annular groove surrounding cavity 1a. The remaining structure is similar to that of Example 1.

[0061] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope of the appended claims.

Claims

1. An injection mold, comprising a mold body (1), wherein the mold body (1) has a mold cavity (1a) and a parting surface (1b), characterized in that: The parting surface (1b) is provided with a plurality of embedding grooves (2) arranged along the edge of the mold cavity (1a), a heating wire (3) is embedded in each embedding groove (2), and each embedding groove (2) includes a strip-shaped main body section (2a) arranged along the edge of the mold cavity (1a). The parting surface (1b) has ventilation grooves (7) at both ends of each main body section (2a) that are separated from the heating wire (3) and arranged along the edge of the mold cavity (1a). The ventilation grooves (7) are connected to the embedding grooves (2) and communicate with the outside world, and the ventilation grooves (7) between two adjacent embedding grooves (2) are connected to each other as a whole.

2. The injection mold according to claim 1, characterized in that The mold cavity (1a) is strip-shaped, and a plurality of embedding grooves (2) are provided on both sides of the mold cavity (1a). On the parting surface (1b) on the same side of the mold cavity (1a), the venting grooves (7) between two adjacent embedding grooves (2) are connected to form a whole.

3. The injection mold according to claim 1, characterized in that The heating wire (3) is a variable diameter structure, and the diameter of the heating wire (3) is proportional to the distance from the axis of the heating wire (3) to the parting surface (1b).

4. The injection mold according to any one of claims 1 to 3, characterized in that: The notch of each embedding groove (2) is covered with a heat insulation board (5).

5. The injection mold according to claim 4, characterized in that: The heat insulation board (5) is located in the embedding groove (2) and the surface of the heat insulation board (5) facing away from the embedding groove (2) is lower than the parting surface (1b). A plurality of grooves (10) are provided on the parting surface (1b) between the main section (2a) of the embedding groove (2) and the mold cavity (1a). The grooves (10) connect the embedding groove (2) and the mold cavity (1a). The bottom surface of the grooves (10) is located between the parting surface (1b) and the heat insulation board (5). An exhaust channel (11) connecting the embedding groove (2) and the outside is provided on the side of the main section (2a) of the embedding groove (2) away from the mold cavity (1a).

6. The injection mold according to claim 5, characterized in that A second groove (12) is provided on the parting surface (1b) between the vent groove (7) and the cavity (1a), and the second groove (12) connects the vent groove (7) and the cavity (1a). A second exhaust channel (13) connecting the vent groove (7) and the outside is provided on the side of the vent groove (7) away from the cavity (1a) on the parting surface (1b).

7. The injection mold according to any one of claims 1 to 3, characterized in that: Each embedding groove (2) further comprises two extension sections (2b) arranged in a direction away from the mold cavity (1a) and respectively connected to the two ends of the main section (2a), and the two ends of each heating wire (3) respectively extend from the two extension sections (2b) of the corresponding embedding groove (2).

8. The injection mold according to claim 4, characterized in that There is a gap (8) between the heating wire (3) and the heat insulation plate (5), and there is a gap (9) between the bottom surface of the ventilation groove (7) and the heat insulation plate (5).

9. The injection mold according to any one of claims 1 to 3, characterized in that: A plurality of temperature detection positions (14) are provided on the parting surface (1b), the temperature detection positions (14) being arranged in one-to-one correspondence with the embedding groove (2), and the temperature detection positions (14) are located on a side of the embedding groove (2) main body section (2a) away from the mold cavity (1a).

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