Injection molding mold structure for feeding glue on sliding blocks on two sides

Abstract

The utility model relates to the field of injection molding molds, in particular to an injection molding mold structure for feeding glue on sliding blocks on the two sides, which comprises an upper mold assembly, a lower mold assembly and a side core-pulling sliding block assembly, the upper mold assembly comprises an upper mold plate, an upper mold core, an upper mold base plate and a sprue bush, the upper mold core and the upper mold plate are connected and fastened through a fixing piece, the upper mold base plate and the upper mold plate are matched through a hanging table, and the sprue bush penetrates through a through hole in the upper mold core and a through hole in the upper mold base plate; the lower die assembly comprises a lower die plate, a lower die core, a lower die base plate, a sliding block guide rail and a sliding block base plate. The side core-pulling sliding block assembly comprises a side sliding block, a mold core fixing block, a sliding mold core, a sprue mold core, a sub-runner mold core and a main runner mold core, and the main runner mold core and the mold core fixing block are connected and fastened through a fixing piece and the mold core fixing block. The sliding block has the effect that the mode that glue is fed into the sliding block is suitable for injection molding production of plastic shells of small precise electronic products.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of injection molding molds, in particular to an injection molding mold structure with glue feeding on both side sliders. BACKGROUND

[0002] The mold used for injection molding is called an injection molding mold. The injection mold structure with glue feeding inside the two side sliders has been applied in the production of injection molded parts in multiple industries. For example, in the manufacturing of automobile parts, automobile interior parts, and complex structure parts, etc., this mold structure is often used because the shape of automobile parts is becoming more and more complex, and the requirements for injection molding molds are constantly increasing. This structure can meet the molding requirements of high precision and complex shape. In the field of electronic device manufacturing, products such as mobile phone cases and computer accessories also begin to use this mold structure to achieve the miniaturization, thinness and high-precision molding of products.

[0003] The injection mold with glue feeding inside the two side sliders is continuously improved and optimized in terms of glue feeding method. It uses multi-section glue feeding to improve the flowability and filling effect of the melt, and reduce product defects to ensure that the plastic melt can enter the cavity more uniformly and stably. The structure design of glue feeding inside the slider is more delicate and complex to meet the molding requirements of the product. However, in the prior art, this structure is mostly used in the production of medium and large plastic products, and is not commonly used for small and precise electronic product plastic shells. CONTENT OF THE INVENTION

[0004] In order to make the glue feeding inside the slider suitable for the injection molding production of small and precise electronic product plastic shells, the present application provides an injection molding mold structure with glue feeding on both side sliders.

[0005] The injection molding mold structure with glue feeding on both side sliders provided by the present application adopts the following technical solution:

[0006] An injection molding mold structure with glue feeding on both side sliders comprises:

[0007] An upper mold assembly comprises an upper mold plate, an upper mold core, an upper mold pad, and a sprue bushing. The upper mold core and the upper mold plate are connected and fastened by a fixing piece. The upper mold pad and the upper mold plate are matched by a hanging table. The sprue bushing is provided in a through hole on the upper mold core and the upper mold pad;

[0008] A lower mold assembly comprises a lower mold plate, a lower mold core, a lower mold pad, a slider guide rail, and a slider pad. The lower mold core and the lower mold plate are connected and fastened by a fixing piece. The lower mold pad and the lower mold plate are matched by a hanging table. The slider guide rail, the slider pad, and the lower mold plate are connected and fastened by a fixing piece;

[0009] The side core-pulling slide block assembly comprises a side slide block, a core fixing block, a sliding core, a sprue core, a runner core, and a main runner core, and the main runner core is connected and fastened with the core fixing block through a fixing piece and the side slide block.

[0010] By adopting the above technical scheme, the two-side glue feeding mode can make the plastic melt more uniformly distributed in the mold cavity, effectively avoid the problems of local under-filling or over-filling of products caused by uneven melt flow compared with single-side glue feeding, and help to reduce the generation of weld marks, thereby improving the strength and appearance quality of the products. The two-side glue feeding optimizes the melt flow path and merging mode, and improves the position and obviousness of the weld marks. It is more convenient for thinner products and improves the quality. Since the glue feeding port and the glue discharging port are both present on the slide block, the two sides of the slide block are the demolding direction. The glue feeding port can only be arranged on the slide block. The close cooperation between the side slide block, the core fixing block and other components enables the slide block to accurately complete the side core-pulling action during injection molding. The two-side glue feeding reduces the melt flow resistance, so that the filling stage can be completed faster, and the product can be smoothly demolded.

[0011] Preferably, the sprue bush is a primary main runner, a primary main material rod is arranged in the primary main runner, the runner core and the main runner core form a secondary main runner after being combined, and a secondary main material rod is arranged in the secondary main runner, and the secondary main material rod is in communication with the primary main material rod.

[0012] By adopting the above technical scheme, the primary main runner and the secondary main runner are combined by the runner core and the main runner core to form two-stage melt flow transmission. This staged structure can reduce the pressure loss of the melt in the long flow process, ensure more uniform cavity filling, and reduce defects such as sink marks caused by uneven flow. The secondary main material rod is in direct communication with the primary main material rod to form a continuous melt channel, avoiding melt stagnation or turbulence at the flow channel turning point and improving flow stability. The primary / secondary main material rod is designed with a cold material hole at the end to capture the cold material at the front end of the melt flow in the main runner / runner, prevent it from entering the cavity to form a cold material spot, flow marks or internal defects, and improve the quality of the molded product. At the same time, the main runner waste (such as primary and secondary main runner condensate) formed by the main material rod can be directly crushed and recycled after being separated from the product, reducing the waste of raw materials.

[0013] Preferably, the lower mold core has a primary runner, and a primary distribution rod is provided in the primary runner. The primary distribution rod is connected to the secondary main material rod. After the runner core and the gate core are closed, a secondary runner and a tertiary runner are formed. A secondary forming distribution rod and a tertiary forming distribution rod are provided in the secondary runner and the tertiary runner. The tertiary forming distribution rod passes through the secondary forming distribution rod and is connected to the primary distribution rod.

[0014] By adopting the above technical solutions, the runner adopts a progressive structure, and the melt distribution is refined step by step through the distribution rods to ensure that the cavities in the multi-cavity mold are filled synchronously, reducing problems such as short shots and flash caused by uneven flow. The continuous melt channel can reduce the pressure loss at the runner turning point, allowing the melt to enter the cavity at a more uniform speed and pressure, which is especially suitable for thin-walled or precision products. Through the staged connection of the distribution rods, the path of the melt from the main runner to the cavity is segmented and optimized, avoiding material waste caused by long-distance flow. Uniform melt flow and cooling control can reduce the generation of weld lines, while the structural design of the distribution rods (such as the conical end) can guide gas discharge and reduce the risk of cavitation.

[0015] Preferably, the primary material distribution rod has a main material cooling rod and a material distribution cooling rod on the side away from the primary main material rod, the main material cooling rod is correspondingly arranged with the secondary main material rod, and the material distribution cooling rod is correspondingly arranged with the secondary material distribution rod.

[0016] By adopting the above technical solution, the main material cooling bar and the secondary main material bar are set up accordingly. The cold slug cavity designed in the mold structure captures the cold material at the front end of the melt flow in the main runner to form the cold slug bar. The main material cold slug cavity is located at the end of the secondary main runner, specifically capturing these leading cold materials to prevent internal stress concentration or structural strength reduction, and to prevent incomplete filling of the runner (cold material blockage). By isolating the cold material, it ensures uniform melt temperature and improves injection molding stability. The distribution cooling bar targets the area of ​​the secondary distribution bar, capturing the cold material at the front end of the melt flow in the runner to prevent it from entering the cavity and avoiding the formation of cold slug spots, flow marks, or internal defects on the product surface. The main material cooling bar and the distribution cooling bar capture the cold material at the front end of the melt flow in the main runner and the runner respectively, ensuring that the molten plastic enters the cavity in a uniform and stable state, making the welding area more uniform. Its main function is to collect and store the "cold material" generated during the injection process, reduce surface defects, and thus improve product quality and mold reliability.

[0017] Preferably, the primary distribution channel is an "S"-shaped channel, and multiple round holes are provided below the primary distribution channel. The multiple round holes cooperate with the pull rod to form a cold material cavity.

[0018] By adopting the technical scheme, the S-shaped runner forces the melt flow direction to change multiple times through a curved path, so that the front end of the cold material is gathered to the outside of the runner under the action of inertia, the cold material cavity is located at the lowest point or the turning point of the runner, the front end of the cold material in the melt flow can be accurately captured to prevent the cold material from entering the cavity to form a cold material spot, a weld mark or an underfilling defect; the round hole cooperates with the pulling rod to fix the condensed material in the cold material cavity on the movable mold side through mechanical hooking when the mold is opened, so as to ensure that the cold material is demolded synchronously with the plastic part; the S-shaped runner can be flexibly connected with multiple cavities or complex structures by adjusting the bending radius and angle, and the lower round hole cold material cavity can be independently set for each branch runner to ensure that the cold material of each cavity is effectively controlled, the mold complexity is reduced, the number of independent structures in the mold is reduced, the processing technology is simplified, and the manufacturing cost is reduced.

[0019] Preferably, the gate core is provided with a latent gate, and the latent gate is communicated with the three-stage distribution rod and the cavity.

[0020] By adopting the technical scheme, the latent gate generally enters the glue from the side or back of the product in the form of an inclination or a tunnel, and the gate is automatically cut off inside the plastic part when the mold is opened, so as to avoid the scar left on the surface of the product by the traditional side gate or point gate, and the latent gate is suitable for plastic parts with high appearance requirements; the latent gate directly communicates the three-stage distribution rod with the cavity, reduces the number of turning of the melt from the main runner to the cavity, reduces the flow resistance, improves the filling speed, and is especially suitable for thin-walled products or large and complex cavities; in a multi-cavity mold, the amount of glue and the filling time of each cavity can be accurately controlled by adjusting the position and size of the latent gate, so as to reduce the size difference or short shot defects of the product caused by unbalanced flow.

[0021] Preferably, the upper mold assembly further comprises an upper mold insert, an inclined guide pillar, a wedge block and a guide sleeve, the inclined guide pillar passes through the wedge block and the upper mold plate, and the inclined guide pillar, the wedge block and the upper mold plate are fastened by a fixing piece.

[0022] By adopting the technical scheme, the upper mold insert is used for forming the complex structure of the product, the waste of the material of the whole mold is avoided, the high-strength material is used for the high-wear area to prolong the service life of the mold, only the insert needs to be replaced when it is damaged, the whole mold does not need to be scrapped, the maintenance cost is reduced, the wedge block transmits the lateral force to the mold plate through the inclined surface and the inclined guide pillar when the mold is closed, so as to offset the reaction force of the injection pressure on the slider, prevent the parting line from expanding or the slider from retreating, reduce the flash and size deviation, the inclined surface of the wedge block can absorb the impact load at the moment of mold opening, and reduce the mold vibration and noise; the inclination angle of the inclined guide pillar cooperates with the sliding groove of the slider to ensure that the lateral core-pulling movement is stable, avoid jamming or misplacement, and is especially suitable for precise plastic parts.

[0023] Preferably, the guide sleeve is connected with the upper die plate through the hanging table, the upper die core is provided with a through hole, and the upper die insert is connected with the hanging table through the through hole on the upper die core.

[0024] By adopting the above technical scheme, the matching surface of the hanging table and the upper die plate is precisely machined, the axis of the guide sleeve is perpendicular to the parting surface of the mold, the jamming or wear caused by the eccentricity of the guide pillar and the guide sleeve is avoided, the asymmetric structure of the hanging table can prevent the guide sleeve from rotating due to the friction torque in use, the guiding accuracy is maintained, the precise matching of the through hole of the upper die core and the insert hanging table ensures that the positioning error of the insert in the cavity is ≤0.02mm, and the consistency of the molding size is ensured.

[0025] Preferably, the lower die assembly further comprises a lower die insert and a guide pillar, the lower die core is provided with a through hole, the lower die insert is connected with the hanging table through the through hole on the lower die core, and the guide pillar is connected with the lower die plate through the hanging table.

[0026] By adopting the above technical scheme, the step hole of the lower die guide pillar hanging table and the lower die plate adopts precise matching, the perpendicularity precision of the axis of the guide pillar and the parting surface is ≤0.01mm, a mirror-symmetrical guiding system is formed with the upper die guide sleeve, the lateral deviation during mold closing is eliminated, the interference fit between the hanging table flange and the die plate counterbore can resist the inertial force during demolding, the guide pillar is prevented from loosening, the precise matching of the hanging table and the through hole of the lower die core ensures that the positioning error of the insert in the cavity is ≤0.02mm, the coaxiality of the core and the cavity is ensured, and the flash of the plastic part is reduced.

[0027] Preferably, the sliding block pad plate is a wear-resistant device of the side core-pulling sliding block assembly, and the sliding block guide rail is a sliding guide device of the side core-pulling sliding block assembly.

[0028] In summary, the present application has at least one of the following beneficial technical effects:

[0029] 1. The upper glue feeding mode of the two sides of the sliding block can make the plastic melt more uniformly distributed in the mold cavity, effectively avoid the problem of local underfilling or overfilling caused by uneven melt flow compared with the single-side glue feeding, and help to reduce the generation of weld lines, thereby improving the strength and appearance quality of the product. The flow path and convergence mode of the melt are optimized by the upper glue feeding of the two sides of the sliding block, so that the position and obviousness of the weld line are improved, which is more convenient for thinner products and improves the quality. Since the glue inlet and the glue outlet are both on the sliding block, the two sides of the sliding block are in the demolding direction, the glue inlet can only be arranged on the sliding block, and the close fit between the side sliding block, the core fixing block and other components enables the sliding block to accurately complete the side core-pulling action during the injection molding process. The two-side glue feeding reduces the resistance of melt flow, so that the filling stage can be completed faster, and the product can be smoothly demolded. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1is the structure diagram of the injection molding system of the embodiment of the present application;

[0031] Figure 2 is the upper and lower mold mold shaft side view of the injection system embodying the present structure;

[0032] Figure 3 is the upper mold shaft side view of the mold embodying the present structure;

[0033] Figure 4 is the lower mold shaft side exploded view of the mold embodying the present structure;

[0034] Figure 5 is the working schematic diagram of the mold for the injection molding machine.

[0035] BRIEF DESCRIPTION OF DRAWINGS: 1, primary material rod; 2, secondary material rod; 3, material cooling rod; 4, primary material rod; 5, secondary material rod; 6, material cooling rod; 7, tertiary material rod; 8, latent gate; 9, molded product; 10, sliding core; 11, gate core; 12, runner core; 13, main runner core; 14, core fixing block; 15, side sliding block; 16, lower mold insert; 17, lower mold core; 18, lower mold pad; 19, upper mold core; 20, upper mold pad; 21, gate sleeve; 22, upper mold insert; 23, inclined guide pillar; 24, wedge block; 25, guide sleeve; 26, upper mold plate; 27, sliding block guide rail; 28, sliding block pad; 29, guide pillar; 30, lower mold plate. DETAILED DESCRIPTION

[0036] The following will be described in detail in combination with the accompanying drawings Figures 1-5 The present application will be further described in detail.

[0037] The embodiment of the present application discloses an injection molding mold structure for feeding glue on both sides of the sliding block. The injection molding mold structure for feeding glue on both sides of the sliding block comprises an upper mold assembly, a lower mold assembly, a core pulling sliding block assembly and a molded product 9. The upper mold assembly comprises an upper mold plate 26, an upper mold core 19, an upper mold pad 20, an upper mold insert 22, an inclined guide pillar 23, a wedge block 24, a guide sleeve 25, and a gate sleeve 21. The upper mold core 19 and the upper mold plate 26 are connected and fastened by a fixing piece, the upper mold pad 20 and the upper mold plate 26 are matched by a hanging table, and the gate sleeve 21 is arranged in the through hole of the upper mold core 19 and the upper mold pad 20. The inclined guide pillar 23 passes through the wedge block 24 and the upper mold plate 26, and the inclined guide pillar 23, the wedge block 24 and the upper mold plate 26 are fastened by a fixing piece.

[0038] Optionally, the upper die insert 22 is used to form complex structures of the molded product 9, avoiding waste of the overall mold material, using high-strength material for high-wear areas to extend the service life of the mold, and only replacing the insert when damaged, without scrapping the overall mold, reducing maintenance costs. The wedge block 24 cooperates with the inclined guide column 23 through the inclined surface when the mold is closed, and the lateral force is transmitted to the mold plate to offset the reaction force of the injection pressure on the slider, preventing the parting line from expanding or the slider from retreating, reducing the flash and size deviation. The inclined surface design of the wedge block 24 can absorb the impact load at the moment of mold opening, reducing mold vibration and noise. Preferably, the inclination angle of the inclined guide column 23 is usually 15°-25°. The inclined guide column 23 cooperates with the slider slot to ensure smooth side core-pulling movement and avoid jamming or misalignment, especially suitable for precision plastic parts.

[0039] The guide sleeve 25 cooperates with the upper die plate 26 through the hanging table. The upper die insert 22 is connected through the hanging table through the through hole on the upper die insert 19. The mating surface of the hanging table and the upper die plate 26 is precisely machined to ensure that the axis of the guide sleeve 25 is perpendicular to the mold parting surface, avoiding jamming or wear caused by the eccentricity of the guide column 29 and the guide sleeve 25. The mating surface can be a stepped hole or a boss, and the precision machining can be selected as H7 / m6 tolerance. The asymmetric structure of the hanging table can prevent the guide sleeve 25 from rotating due to friction torque during use, maintaining the guiding accuracy. The precise fit of the through hole of the upper die insert 19 and the insert hanging table ensures that the positioning error of the insert in the cavity is ≤0.02mm, ensuring the consistency of the molded size.

[0040] The lower mold assembly includes a lower mold plate 30, a lower mold insert 17, a lower mold pad 18, a slider guide rail 27, a lower mold insert 16, a guide column 29, and a slider pad 28. The lower mold insert 17 is connected and fastened between the lower mold plate 30 through the fixing part, the lower mold pad 18 cooperates with the lower mold plate 30 through the hanging table, the slider guide rail 27 and the slider pad 28 are connected and fastened between the lower mold plate 30 through the fixing part, the lower mold insert 16 is connected through the hanging table through the through hole on the lower mold insert 17, and the guide column 29 cooperates with the lower mold plate 30 through the hanging table. The stepped hole of the lower mold guide column 29 hanging table and the lower mold plate 30 adopts precise fit to ensure that the axis of the guide column 29 is perpendicular to the parting surface with a perpendicularity of ≤0.01mm, forming a mirror-symmetrical guiding system with the upper mold guide sleeve 25, eliminating the lateral deviation during mold closing, and the interference fit of the flange of the hanging table and the mold plate counterbore can resist the inertial force during demolding, avoiding the guide column 29 from loosening, and the interference fit can be 0.02-0.05mm. The precise fit of the hanging table and the through hole of the lower mold insert 17 makes the positioning error of the insert in the cavity ≤0.02mm, ensuring the coaxiality of the core and the cavity, and reducing the flash of the plastic part. Preferably, the slider pad 28 is a wear-resistant device for the side core-pulling slider assembly, and the slider guide rail 27 is a sliding guide device for the side core-pulling slider assembly.

[0041] The side core-pulling slide block assembly comprises a side slide block 15, a core fixing block 14, a sliding core 10, a sprue core 11, a runner core 12, and a main runner core 13, which is connected and fastened with the core fixing block 14 through a fixing piece and the side slide block 15. The way of feeding glue on the two side slide blocks 15 can make the plastic melt distribute more uniformly in the mold cavity, and compared with single-side feeding, it can effectively avoid the problems of local under-filling or over-filling caused by uneven melt flow.

[0042] Optionally, the sprue bushing 21 is a primary main runner, a primary main material rod 1 is arranged in the primary main runner, the runner core 12 and the main runner core 13 form a secondary main runner after being combined, a secondary main material rod 2 is arranged in the secondary main runner, and the secondary main material rod 2 is in communication with the primary main material rod 1. The primary main runner and the secondary main runner are formed by combining the runner core 12 and the main runner core 13, melt flow is divided into two stages, the hierarchical structure can reduce the pressure loss of melt in a long process, ensure more uniform cavity filling, and reduce defects such as short shots and sink marks caused by uneven flow; the secondary main material rod 2 is in direct communication with the primary main material rod 1, forming a continuous melt channel, avoiding melt stagnation or turbulence at the runner turning point, and improving flow stability; the primary main material rod 1 and the secondary main material rod 2 are designed with cold material holes at the ends, which can capture the cold material at the front end of melt flow in the main runner / runner, prevent it from entering the cavity to form cold spots, flow marks or internal defects, and improve the quality of the molded product. At the same time, after the main runner waste of the primary main material rod 1 and the secondary main material rod 2 is separated from the product, it can be directly crushed and recycled, reducing material waste.

[0043] The lower mold core 17 is provided with a primary runner, a primary material rod 4 is arranged in the primary runner, the primary material rod 4 is connected with the secondary main material rod 2, the runner core 12 and the sprue core 11 form a secondary runner and a tertiary runner after being combined, the secondary runner and the tertiary runner are provided with a secondary material rod 5 and a tertiary material rod 7, the tertiary material rod 7 is arranged in the secondary material rod 5, the secondary material rod 5 is in communication with the primary material rod 4, and the tertiary material rod 7 is connected with the molded product 9 through a latent gate 8. The runner adopts a progressive structure, the melt distribution is gradually refined through the material rods, synchronous filling of each cavity in a multi-cavity mold is ensured, short shots and flash caused by uneven flow are reduced, a continuous melt channel can reduce the pressure loss at the runner turning point, the melt can enter the cavity at a more uniform speed and pressure, and the structure is especially suitable for thin-walled or precision products.

[0044] Preferably, through the hierarchical connection of the material rods, the path of the melt from the main runner to the cavity is segmented and optimized, material waste caused by long-distance flow is avoided, uniform melt flow and cooling control can reduce the generation of weld lines, and the structure design (such as a tapered end) of the material rod can guide gas discharge and reduce the risk of gas pockets.

[0045] The primary material cooling rod 3 is arranged corresponding to the secondary material main rod 2, and the material cooling rod 6 is arranged corresponding to the secondary material branch rod 5. The cold material rod is formed by capturing the cold material at the front end of the melt flow in the main runner through the cold material hole designed in the mold structure. The cold material hole for the main material is located at the end of the secondary material main runner, which is specially used to capture the cold material at the front end of the melt flow, prevent the internal stress concentration or the structural strength reduction, prevent the incomplete filling of the branch runner (cold material blockage), ensure the uniform melt temperature and improve the injection stability by isolating the cold material; the material cooling rod 6 is used for capturing the cold material at the front end of the melt flow in the branch runner, preventing the cold material from entering the cavity, and avoiding the formation of cold material spots, flow marks or internal defects on the product surface; the material cooling rod 3 and the material cooling rod 6 are used for capturing the cold material at the front end of the melt flow in the main runner and the branch runner respectively, ensuring that the molten plastic enters the cavity in a uniform and stable state, making the welding area more uniform, and the main function is to collect and store the cold material generated during the injection process, reduce the surface defects, and thus improve the product quality and mold reliability.

[0046] In an optional embodiment, the primary branch runner is an “S”-shaped runner, and a plurality of round holes are arranged below the primary branch runner, which cooperate with the material pulling rod to form the cold material hole. The “S”-shaped runner forces the melt flow direction to change multiple times through the curved path, so that the cold material at the front end is gathered to the outside of the runner under the action of inertia. The cold material hole is located at the lowest point or the turning point of the runner, which can accurately capture the cold material at the front end of the melt flow, prevent it from entering the cavity to form cold material spots, welding marks or insufficient filling, etc. The round hole cooperates with the material pulling rod to fix the condensed material in the cold material hole on the movable mold side through the mechanical hooking action when the mold is opened, ensuring that the cold material is synchronized with the plastic part to be demolded.

[0047] In a preferred embodiment, the “S”-shaped runner can be flexibly connected to multiple cavities or complex structures by adjusting the bending radius and angle, and the round hole cold material hole below can be independently arranged for each branch runner, ensuring that the cold material of each cavity is effectively controlled, reducing the complexity of the mold, reducing the number of independent structures in the mold, simplifying the processing technology, and reducing the manufacturing cost.

[0048] In a preferred embodiment, the gate core 11 is provided with a latent gate 8, which is in communication with the third material branch rod 7 and the cavity. The latent gate 8 usually enters the glue from the side or back of the product in the form of inclination or tunnel, and the gate is automatically cut off in the plastic part during mold opening, avoiding the scar left on the product surface by the traditional side gate or point gate, which is suitable for plastic parts with high appearance requirements.

[0049] The latent gate 8 directly communicates the three-stage distribution rod 7 with the cavity, reduces the number of turns of the melt from the main runner to the cavity, reduces the flow resistance, and improves the filling speed. It is especially suitable for thin-walled products or large and complex cavities. In a multi-cavity mold, by adjusting the position and size of the latent gate 8, the resin inflow amount and filling time of each cavity can be accurately controlled, and the size difference or short shot defects caused by flow imbalance can be reduced. Optionally, the inclination angle of the latent gate 8 is usually 20°-45°, and the shearing action of the latent gate 8 and the cavity wall causes the gate to be pulled off by the plastic part itself during demolding, avoiding the problem of gate residue or sticking to the mold. The latent gate 8 does not need to be provided with a gate sleeve 21 or a separate runner system on the parting surface, which can simplify the mold parting surface design, reduce the processing difficulty and mold assembly error.

[0050] When the embodiment of the present application is used on an injection molding machine, the working steps are:

[0051] S1, the injection molding machine starts to close the mold;

[0052] S1.1, the guide column 29 arranged on the lower mold plate 30 is guided and matched with the guide sleeve 25 arranged on the upper mold plate 26, so that the injection mold is closed.

[0053] S1.2, the inclined guide column 23 passes through the inclined guide column 23 hole arranged on the side slide block 15, and slides forward through the slide block guide rail 27.

[0054] S2, the injection molding machine completes the mold closing;

[0055] S2.1, the injection molding machine injects resin melt into the mold gate sleeve 21 through the nozzle, and the front end cold material flows into the main material cold material cavity through the first-stage main runner, the second-stage main runner, and the front end cold material;

[0056] S2.2, the resin melt flows into the “S”-shaped first-stage distribution runner, and the front end cold material flows into the distribution cold material cavity. Further, the resin melt flows into the second-stage distribution runner, and further flows into the third-stage distribution runner;

[0057] S2.3, the resin melt flows into the latent gate 8;

[0058] S2.4, the resin melt flows into the mold cavity through the latent gate 8, and is injection molded after pressure maintaining and cooling.

[0059] S3, the injection molding machine starts to open the mold;

[0060] S3.1, the side slide block 15 is guided by the inclined guide column 23, slides backward through the slide block guide rail 27 to pull apart, the side core-pulling slide block assembly, and shears the gate through the lateral force to separate the injection molded product from the gate.

[0061] S4, the injection molding machine completes the mold opening;

[0062] S5, the injection molded product is ejected and demolded by the push rod.

[0063] S6, entering the next injection molding production cycle.

[0064] The implementation principle of the embodiment of the application is that the two-side slide block 15 can make the plastic melt more uniformly distributed in the mold cavity, compared with the single-side glue feeding, can effectively avoid the problem of local insufficient filling or excessive filling of the product caused by uneven melt flow, at the same time, helps to reduce the generation of weld marks, and further improves the strength and appearance quality of the product, the two-side slide block 15 feeds glue, the flow path and convergence mode of the melt are optimized, the position and obvious degree of the weld mark are improved, it is more convenient for thinner products, and the quality is improved; since the glue feeding port and the glue discharging port are both on the slide block, the two sides of the slide block are the demolding direction, the glue feeding port can only be arranged on the slide block, the close cooperation between the side slide block 15, the core fixing block 14 and other components makes the slide block be able to accurately complete the side core pulling action in the injection molding process, the two-side glue feeding reduces the resistance of the melt flow, makes the filling stage be able to be completed faster, and makes the product smoothly demold.

[0065] The above are the preferred embodiments of the application, and do not limit the protection scope of the application, therefore: all equivalent changes made according to the structure, shape, principle of the application should be covered in the protection scope of the application.

Claims

1. An injection molding mold structure with glue entering through sliders on both sides, characterized in that, include: The upper mold assembly includes an upper mold plate (26), an upper mold core (19), an upper mold pad (20), and a sprue sleeve (21). The upper mold core (19) and the upper mold plate (26) are connected and fastened by a fastener. The upper mold pad (20) and the upper mold plate (26) are fitted together by a mounting plate. The sprue sleeve (21) passes through the through holes on the upper mold core (19) and the upper mold pad (20). The lower mold assembly includes a lower mold plate (30), a lower mold core (17), a lower mold pad (18), a slider guide rail (27), and a slider pad (28). The lower mold core (17) and the lower mold plate (30) are connected and fastened by a fastener. The lower mold pad (18) and the lower mold plate (30) are fitted together by a mounting plate. The slider guide rail (27), the slider pad (28), and the lower mold plate (30) are connected and fastened by a fastener. The side core-pulling slider assembly includes a side slider (15), a core fixing block (14), a sliding core (10), a gate core (11), a runner core (12), and a main runner core (13). The main runner core (13) and the core fixing block (14) are connected and fastened to the side slider (15) by a fastener.

2. The injection molding mold structure with glue injected into the sliders on both sides according to claim 1, characterized in that: The sprue sleeve (21) is a primary main runner, and a primary main material rod (1) is inserted inside the primary main runner. After the branch runner core (12) and the main runner core (13) are closed, a secondary main runner is formed. A secondary main material rod (2) is inserted inside the secondary main runner, and the secondary main material rod (2) is connected to the primary main material rod (1).

3. The injection molding mold structure with glue injected onto sliders on both sides according to claim 2, characterized in that: The lower mold core (17) is provided with a primary runner, and a primary material distribution rod (4) is provided in the primary runner. The primary material distribution rod (4) is connected to the secondary main material rod (2). After the runner core (12) and the gate core (11) are closed, a secondary runner and a tertiary runner are formed. A secondary material distribution rod (5) and a tertiary material distribution rod (7) are provided in the secondary runner and the tertiary runner. The tertiary material distribution rod (7) passes through the secondary material distribution rod (5). The secondary material distribution rod (5) is connected to the primary material distribution rod (4).

4. The injection molding mold structure with glue injected onto sliders on both sides according to claim 3, characterized in that: The primary material distribution rod (4) is provided with a main material cooling rod (3) and a material distribution cooling rod (6) on the side away from the primary main material rod (1). The main material cooling rod (3) is provided in correspondence with the secondary main material rod (2), and the material distribution cooling rod (6) is provided in correspondence with the secondary material distribution rod (5).

5. The injection molding mold structure with glue injected onto sliders on both sides according to claim 3, characterized in that: The primary distribution channel is an "S" shaped channel, and multiple round holes are provided below the primary distribution channel. These round holes cooperate with the pull rod to form a cold material cavity.

6. The injection molding mold structure with glue injected into the sliders on both sides according to claim 3, characterized in that: The gate core (11) is provided with a submerged gate (8), and the three-stage material distribution rod (7) is connected to the molded product (9) through the submerged gate (8).

7. The injection molding mold structure with glue injected onto sliders on both sides according to claim 1, characterized in that: The upper mold assembly also includes an upper mold insert (22), an inclined guide post (23), a wedge block (24), and a guide sleeve (25). The inclined guide post (23) passes between the wedge block (24) and the upper template (26). The inclined guide post (23), the wedge block (24), and the upper template (26) are fastened together by a fastener.

8. The injection molding mold structure with glue injected onto sliders on both sides according to claim 7, characterized in that: The guide sleeve (25) is fitted with the upper template (26) through the mounting platform. The upper mold core (19) is provided with a through hole. The upper mold insert (22) is connected to the mounting platform through the through hole on the upper mold core (19).

9. The injection molding mold structure with glue injected into the sliders on both sides according to claim 1, characterized in that: The lower mold assembly also includes a lower mold insert (16) and a guide post (29). The lower mold core (17) has a through hole. The lower mold insert (16) is connected to the lower mold core (17) through the through hole via a mounting platform. The guide post (29) is engaged with the lower mold plate (30) via the mounting platform.

10. The injection molding mold structure with glue injected into the sliders on both sides according to claim 9, characterized in that: The slider pad (28) is a wear-resistant device for the side core-pulling slider assembly, and the slider guide rail (27) is a sliding guide device for the side core-pulling slider assembly.

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