Mobile phone plastic middle frame mold with improved front mold glue inlet

Abstract

The utility model relates to the technical field of mobile phone middle frame molds, and particularly discloses a mobile phone plastic middle frame mold with an improved front mold glue inlet, which comprises a front mold bottom plate, a glue inlet system, a heat flow plate for providing a heat source for the glue inlet system, and a front mold core, the upper end of the front mold core protrudes outwards to form a mold core used for being matched with a mold cavity of the rear mold core to form an injection molding space, a pipeline for communicating the hot flow plate with the front mold core is arranged between the hot flow plate and the front mold core and used for circulating an injection molding material, and the glue inlet system comprises a hot runner arranged in the pipeline, a branch runner arranged on the front mold core and a pouring gate communicated with the mold core; one end of the hot runner penetrates through the hot flow plate and is communicated with a nozzle of an external injection molding machine, and the other end of the hot runner extends to the bottom of the front mold core and is communicated with the sub-runner; the reasonable glue inlet system can optimize the injection molding process, improve the production efficiency and the production quality, reduce material waste and save the cost.

Description

Technical Field

[0001] The utility model relates to the technical field of mobile phone middle frame molds, and in particular discloses a mobile phone plastic middle frame mold with an improved front mold glue inlet. Background Art

[0002] Traditional injection molds often present numerous challenges in the production of plastic mobile phone midframes. For one thing, the injection molding process is suboptimal. Due to a lack of effective heat supply, the injection material tends to cool prematurely during flow, resulting in poor fluidity and hindering uniform filling of the mold cavity. Traditional molds also suffer from poorly designed glue inlet systems, with single hot runner apertures, simple runner structures, and a single gate type. This makes it impossible to precisely control the flow rate and flow rate of the injection material, resulting in uneven material filling, difficult to guarantee product quality, and low injection efficiency.

[0003] On the other hand, the mold lacks stability and lacks precise positioning between the front mold core and other components. This makes it prone to displacement during the injection molding process due to vibration and pressure changes, which not only affects product quality but also shortens the mold's lifespan. Furthermore, traditional molds often have high production costs during the production process. Due to poorly designed glue inlets, it is difficult to produce high-quality products and is prone to material waste. To address these issues, there is an urgent need for an improved mobile phone plastic middle frame mold to optimize the injection molding process, improve product quality and production efficiency, enhance mold stability, and reduce production costs. Utility Model Content

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present invention is to provide a mobile phone plastic middle frame mold with an improved front mold glue inlet.

[0005] To achieve the above-mentioned purpose, the utility model provides an improved mobile phone plastic middle frame mold with a front mold glue inlet, comprising a front mold base plate, a glue inlet system, a heat flow plate for providing a heat source for the glue inlet system, and a front mold core. The heat flow plate is arranged on the front mold base plate, and the upper end of the front mold core protrudes outward to form a mold core for cooperating with the mold cavity of the rear mold core to form an injection space. A pipe connecting the hot flow plate and the front mold core is provided to connect the two for circulating injection molding material. The glue inlet system includes a hot runner arranged in the pipe, a branch channel arranged on the front mold core, and a gate connected to the mold core. One end of the hot runner passes through the hot flow plate and is connected to the nozzle of an external injection molding machine, and the other end extends to the bottom of the front mold core and is connected to the branch channel. The branch channel is connected to the gate to transport injection molding material to the injection molding space.

[0006] The hot flow plate is set on the bottom plate of the front mold to provide a heat source for the glue inlet system, ensuring that the injection molding material maintains good fluidity during the flow process and preventing the material from cooling prematurely and affecting the injection molding quality. The upper end of the front mold core protrudes outward to form a mold core, which cooperates with the rear mold core to form an injection space. This design makes the structure of the mold more compact and improves the stability and reliability of the mold. The glue inlet system includes a hot runner, a branch channel and a gate. One end of the hot runner passes through the hot flow plate and is connected to the nozzle of the external injection molding machine, and the other end extends to the bottom of the front mold core and is connected to the branch channel. This design allows the injection molding material to flow into the interior of the mold quickly and evenly, reducing injection time and material waste. The optimized design of the glue inlet system allows the injection molding material to be evenly filled into the injection molding space, reducing air holes and defects inside the product and improving the strength and reliability of the product.

[0007] Furthermore, a first flow hole, a second flow hole, a third flow hole and a fourth flow hole are provided at one end of the hot runner close to the branch channel. The first flow hole, the second flow hole, the third flow hole and the fourth flow hole are arranged in sequence along the length direction of the pipeline. The aperture sizes of the first flow hole, the second flow hole and the third flow hole continuously transition to become smaller in sequence, and the aperture sizes of the third flow hole to the fourth flow hole continuously transition to become larger in a trumpet shape.

[0008] Providing orifices of varying diameters with a continuous transition in size allows for better control of the injection material's flow rate and volume. As the injection material flows from the injection molding machine nozzle into the hot runner, the larger first orifice allows for smoother material entry, preventing initial blockage and excessive pressure. As the material flows, the orifices gradually decrease in size, as in the second and third orifices. This helps increase the pressure of the injection material, allowing it to flow more forcefully into the runners, ensuring sufficient material filling of the runners and gates, improving product quality. The continuous, trumpet-shaped transition from the third to the fourth orifice creates a larger diameter. This design acts as a buffer for the material as it enters the runners, reducing impact and preventing damage. It also ensures more even distribution of the material across the runners. Precisely controlling the injection material's flow rate and pressure ensures more uniform material filling within the mold, reducing defects such as pores and sink marks within the product, and improving product appearance and dimensional accuracy.

[0009] Furthermore, the diverter channel has a plurality of branches arranged and distributed around the central axis of the hot runner, and the plurality of branches form a spoke-like structure centered at the connection point between the hot runner and the diverter channel.

[0010] Multiple branches are arranged around the central axis of the hot runner, evenly distributing the injection material flowing from the hot runner to each branch. The spoke-like structure ensures relatively uniform spacing between the branches, reducing pressure loss during material flow and ensuring that the material reaches the gate at a relatively stable pressure and velocity, further ensuring consistent filling across all parts of the product. Compared to traditional single-runner designs, this spoke-shaped runner design can fill the mold cavity with sufficient material in a shorter time, improving production efficiency. The spoke-shaped runner structure forms a relatively stable support system within the mold. This structure distributes the pressure generated during the injection molding process, reducing mold deformation and damage. The branches work together to share the injection pressure, ensuring excellent stability and reliability over long-term use. The evenly distributed runner branches also help maintain uniform temperature distribution in the mold, preventing local overheating or overcooling, thereby reducing product quality issues caused by temperature unevenness.

[0011] Furthermore, the gate includes a first feed port with an arc fan-shaped structure and a second feed port with a pin-point structure. The first feed port is used to transport injection molding material to an area with a larger injection volume, and the second feed port is used to transport injection molding material to a thin-walled area or an area with a smaller injection volume.

[0012] For areas with larger injection volumes, the curved fan-shaped first feed port provides a larger feed channel, ensuring sufficient and rapid material flow. This prevents product defects caused by insufficient material, such as incomplete filling and sink marks. For thin-walled areas or those with smaller injection volumes, the pin-point second feed port is smaller, enabling precise control of the material flow. This helps prevent deformation or cracking in thin-walled areas due to excessive material, while also meeting the material needs of areas with smaller injection volumes, enabling more refined molding in these areas. Different gate structures deliver material to specific areas with different requirements, making the injection molding process more efficient. Material can be supplied to different areas simultaneously, reducing injection time and improving production efficiency. This targeted gate design ensures more uniform filling across the product and reduces internal stress concentration. This improves the overall strength and stability of the product and reduces the risk of damage during use.

[0013] Furthermore, the bottom of the front mold core is recessed inward to form a first positioning groove, and the upper end of the front mold core is recessed inward to form a second positioning groove. The second positioning grooves are distributed around the mold core for the front mold core and the rear mold core to be installed in coordination.

[0014] The first positioning groove at the bottom of the front mold core can play a role in precise positioning when other components are installed. The second positioning grooves at the upper end are distributed around the mold core and are used for the coordinated installation of the front mold core and the rear mold core. During the mold closing process, the corresponding positioning structure on the rear mold core cooperates with the second positioning groove to enable the front mold core and the rear mold core to be accurately aligned in the horizontal direction, ensuring the dimensional accuracy and shape accuracy of the injection molding space, and avoiding quality problems such as dimensional deviation and flash in the product due to inaccurate installation. The design of the first positioning groove and the second positioning groove increases the stability of the front mold core in the mold. During the injection molding process, the mold will be subjected to greater pressure and impact force. The positioning grooves can make the front mold core tightly combined with other components, reduce the displacement caused by vibration and pressure changes, thereby improving the overall stability of the mold and extending the service life of the mold.

[0015] Furthermore, a stripping insert is provided on the pipe, and a positioning boss protrudes outward from the stripping insert to cooperate with the positioning groove, and a space-avoiding step is formed between the positioning boss and the stripping insert.

[0016] The positioning boss on the stripper insert works in conjunction with the positioning groove on the front mold core to ensure the stripper insert is accurately positioned in the pipe, achieving precise positioning and avoiding deviations in the stripper insert's installation. This precise positioning method helps improve the overall accuracy of the mold, allowing the injection molding material to flow smoothly through the pipe and accurately enter the mold cavity, reducing problems such as material blockage and poor flow caused by inaccurate positioning, and improving the molding quality of the product. The coordination of the positioning boss and positioning groove ensures a tighter and more stable connection between the stripper insert and the front mold core. During the injection molding process, the mold is subjected to significant pressure and impact forces. This tight connection prevents the stripper insert from shifting or loosening, ensuring its stable operation and improving the reliability of the mold. The design of the air-avoidance step can, to a certain extent, alleviate stress concentration in the mold during operation, reducing the risk of damage to the stripper insert and the front mold core due to excessive stress, and extending the service life of the mold.

[0017] Furthermore, the number of hot runners is set to be multiple, and the multiple branch runners connected to the multiple hot runners are connected to each other.

[0018] The use of multiple hot runners can increase the speed and flow rate of the injection material. When the injection molding machine injects material into the mold, multiple hot runners operate simultaneously, delivering sufficient material to the runners in a shorter time, thereby accelerating the injection process and improving production efficiency. Multiple hot runners and interconnected runners distribute the injection material more evenly throughout the mold cavity. This uniform material distribution reduces stress concentration and defects within the product, such as pores and sink marks, improving product quality and appearance. Interconnected runners also balance pressure across different areas, preventing localized pressure increases or decreases, ensuring consistent filling across all parts of the product and improving dimensional accuracy and stability.

[0019] Furthermore, cooling water channels are provided on the front mold core and the stripping insert, and the cooling water channels are arranged in a well-shaped layout around the central axis of the pipeline.

[0020] Cooling channels installed on the front mold core and stripping inserts quickly dissipate heat generated during the injection molding process, allowing the product and mold to cool rapidly. This significantly shortens the molding cycle and improves production efficiency. Cooling channels arranged in a crisscross pattern around the central axis of the channel ensure uniform cooling. This layout dissipates heat evenly from all directions, preventing localized overheating or overcooling, thereby ensuring product quality and dimensional stability. Rapid cooling reduces shrinkage and deformation during the cooling process. By controlling the cooling rate, the product's internal structure becomes more uniform, reducing stress concentration and improving its strength and durability. Uniform cooling also prevents surface defects such as bubbles and sink marks. A well-planned cooling channel ensures a uniform temperature drop across the product surface, resulting in a smoother and more aesthetically pleasing appearance.

[0021] Furthermore, the front mold base is provided with a positioning ring connected to the nozzle of an external injection molding machine, and a gate sleeve screwed with the gate sleeve for connecting to the nozzle of the external injection molding machine. The gate sleeve passes through the front mold base and is connected to the hot runner.

[0022] A positioning ring is provided on the front mold base plate, enabling precise positioning and connection with the nozzle of an external injection molding machine. The positioning ring ensures that the injection molding machine nozzle and the mold's glue inlet can be quickly and accurately aligned during installation, reducing installation errors and improving the precision and stability of injection molding. The threaded sprue bushing further enhances the stability of the connection with the external injection molding machine nozzle. The threaded connection makes the connection more secure, capable of withstanding the high pressure and impact forces during the injection molding process, and prevents loosening or leakage between the nozzle and the mold. The sprue bushing extends through the front mold base plate and connects to the hot runner, providing a direct and smooth channel for the injection molding material. This design reduces resistance to material flow, improves glue feeding speed and efficiency, and ensures a smooth injection molding process.

[0023] Furthermore, the hot flow plate is provided with guide pillars for cooperating with the rear mold, and the number of the guide pillars is set to be multiple.

[0024] Multiple guide pins are installed on the manifold to ensure precise positioning when it is installed in conjunction with the rear mold. Multiple guide pins can ensure the accurate relative position between the manifold and the rear mold from different positions and angles, avoid installation deviations, and improve the overall accuracy of the mold. Accurate positioning helps reduce injection molding problems caused by improper installation, such as material leakage and product dimensional deviations, thereby improving product quality and consistency. The distribution of multiple guide pins can make the connection between the manifold and the rear mold more stable. During the injection molding process, the mold will be subjected to greater pressure and impact force. Multiple guide pins can disperse these forces and reduce the risk of deformation and damage to the mold.

[0025] The beneficial effects of the present invention are as follows: optimizing the injection molding process, improving product quality and production efficiency; the hot flow plate provides a heat source for the glue inlet system, ensuring good fluidity of the injection molding material. The hot runner and special aperture design, the spoke-shaped structure of the diverter, different types of gates, etc. can accurately control the flow rate and flow of the injection molding material, so that the material can evenly fill the mold cavity; multiple hot runners and interconnected diverter channels can increase the inflow speed and flow of the injection molding material, improve the injection molding efficiency, and ensure the injection molding quality; enhance the stability of the mold; the positioning groove on the front mold core cooperates with the positioning boss of the stripping insert, and the close connection of multiple components enhances the stability and reliability of the mold during the injection molding process, reduces the displacement caused by vibration and pressure changes, and extends the service life of the mold; reduces production costs; the optimized glue inlet design can produce high-quality products, reduce unnecessary material waste, and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of a mobile phone plastic middle frame mold with an improved front mold glue inlet according to the present invention;

[0027] Figure 2 It is a cross-sectional schematic diagram of the hot runner of the utility model;

[0028] Figure 3 This is a schematic diagram of the first partial structure of the utility model;

[0029] Figure 4 This is a schematic diagram of the partial structure explosion of the utility model;

[0030] Figure 5 This is a schematic diagram of the second partial structure of the utility model Figure 1 ;

[0031] Figure 6 This is a schematic diagram of the second partial structure of the utility model Figure 2 ;

[0032] Figure 7 This is a structural diagram of the front mold base plate of the present invention.

[0033] The reference numerals include: 1. front mold base plate; 11. positioning ring; 12. gate sleeve; 2. glue inlet system; 21. hot runner; 211. first flow hole; 212. second flow hole; 213. third flow hole; 214. fourth flow hole; 22. branch channel; 221. branch; 23. gate; 231. first feed port; 232. second feed port; 3. hot flow plate; 31. guide column; 4. front mold core; 41. first positioning groove; 42. second positioning groove; 5. mold core; 6. stripping insert; 61. positioning boss; 62. air avoidance step; 7. cooling water channel; 8. pipeline. DETAILED DESCRIPTION

[0034] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and drawings. The contents mentioned in the embodiments are not intended to limit the present invention.

[0035] See also Figures 1 to 7 As shown, the utility model is an improved mobile phone plastic middle frame mold with a front mold glue inlet, comprising a front mold base plate 1, a glue inlet system 2, a heat flow plate 3 providing a heat source for the glue inlet system 2, and a front mold core 4. The heat flow plate 3 is arranged on the front mold base plate 1, and the upper end of the front mold core 4 protrudes outward to form a mold core 5 for cooperating with the mold cavity of the rear mold core to form an injection space. A pipe 8 connecting the hot flow plate 3 and the front mold core 4 is provided between the hot flow plate 3 and the front mold core 4 for circulating the injection molding material. The glue inlet system 2 includes a hot runner 21 arranged in the pipe 8, a branch channel 22 arranged on the front mold core 4 and a gate 23 connected to the mold core 5. One end of the hot runner 21 passes through the hot flow plate 3 and is connected to the nozzle of the external injection molding machine, and the other end extends to the bottom of the front mold core 4 and is connected to the branch channel 22. The branch channel 22 is connected to the gate 23 to transport the injection molding material to the injection molding space.

[0036] During actual use, the hot flow plate 3 is arranged on the front mold base plate 1 to provide a heat source for the glue inlet system 2, ensuring that the injection molding material maintains good fluidity during the flow process and preventing the material from cooling prematurely and affecting the injection molding quality. The upper end of the front mold core 4 protrudes outward to form a mold core 5, which cooperates with the rear mold core to form an injection molding space. This design makes the structure of the mold more compact and improves the stability and reliability of the mold. The glue inlet system 2 includes a hot runner 21, a branch channel 22 and a gate 23. One end of the hot runner 21 passes through the hot flow plate 3 and is connected to the nozzle of the injection molding machine outside, and the other end extends to the bottom of the front mold core 4 and is connected to the branch channel 22. This design allows the injection molding material to flow into the interior of the mold quickly and evenly, reducing injection molding time and material waste. The optimized design of the glue inlet system 2 enables the injection molding material to be evenly filled into the injection molding space, reducing air holes and defects inside the product, and improving the strength and reliability of the product.

[0037] Specifically, a first flow hole 211, a second flow hole 212, a third flow hole 213 and a fourth flow hole 214 are provided at one end of the hot runner 21 close to the branch channel 22. The first flow hole 211, the second flow hole 212, the third flow hole 213 and the fourth flow hole 214 are arranged in sequence along the length direction of the pipe 8. The aperture sizes of the first flow hole 211, the second flow hole 212 and the third flow hole 213 continuously transition to become smaller in sequence, and the aperture size of the third flow hole 213 to the fourth flow hole 214 continuously transitions to become larger and is trumpet-shaped.

[0038] In actual use, setting flow holes of different apertures and continuously changing the aperture sizes in sequence can better control the flow rate and flow rate of the injection molding material. When the injection molding material flows into the hot runner 21 from the injection molding machine nozzle, the first flow hole 211 with a larger aperture allows the material to enter the hot runner 21 more smoothly, avoiding blockage and excessive pressure in the initial stage. As the material flows, the aperture gradually becomes smaller, such as the second flow hole 212 and the third flow hole 213. This helps to increase the pressure of the injection molding material, allowing it to flow more forcefully into the branch channel 22, ensuring that the material can fully fill each branch channel 22 and the gate 23, and improving the molding quality of the product. The aperture of the third flow hole 213 to the fourth flow hole 214 continuously transitions to become larger and trumpet-shaped. This design can act as a buffer when the material is about to enter the branch channel 22, reducing the impact of the material on the branch channel 22 and avoiding damage to the branch channel 22. It also helps to distribute the material more evenly to each branch channel 22. By precisely controlling the flow rate and pressure of the injection molding material, the material can be filled more evenly in the mold, reducing defects such as pores and shrinkage marks inside the product, and improving the product's appearance quality and dimensional accuracy.

[0039] Specifically, the branch channel 22 has a plurality of branches 221 arranged and distributed around the central axis of the hot runner 21 , and the plurality of branches 221 form a spoke-like structure centered at the connection point between the hot runner 21 and the branch channel 22 .

[0040] In actual use, multiple branches 221 are arranged and distributed around the central axis of the hot runner 21, which can evenly distribute the injection molding material flowing out of the hot runner 21 to each branch 221. The spoke-shaped structure makes the distance between each branch 221 relatively uniform, which helps to reduce the pressure loss of the material during the flow process, so that the material can reach the gate 23 at a relatively stable pressure and speed, further ensuring the consistent filling effect of various parts of the product. Compared with the traditional single branch channel 22 design, this spoke-shaped branch channel 22 can fill enough material into the mold cavity in a shorter time, thereby improving production efficiency. The branch channel 22 with a spoke-shaped structure forms a relatively stable support system inside the mold. This structure can disperse the pressure generated during the injection molding process and reduce the risk of deformation and damage to the mold. The branches 221 cooperate with each other and jointly bear the injection molding pressure, so that the mold can maintain good stability and reliability during long-term use. The evenly distributed branches 221 of the runner 22 also help to evenly distribute the temperature of the mold, avoiding local overheating or overcooling, thereby reducing product quality problems caused by uneven temperature.

[0041] Specifically, the gate 23 includes a first feed port 231 with an arc fan-shaped structure and a second feed port 232 with a pin-point structure. The first feed port 231 is used to deliver injection molding material to areas with larger injection volumes, and the second feed port 232 is used to deliver injection molding material to thin-walled areas or areas with smaller injection volumes.

[0042] In actual use, for areas with larger injection volumes, the first feed port 231 of the curved fan-shaped structure can provide a larger feed channel to ensure that sufficient injection material flows in quickly. This can avoid product defects caused by insufficient feed, such as incomplete filling, shrinkage marks and other problems. For thin-walled areas or areas with smaller injection volumes, the second feed port 232 of the pin-point structure is small in size and can accurately control the flow of injection material. This helps prevent deformation or cracking of thin-walled areas due to excessive material, while also meeting the material requirements of areas with smaller injection volumes, making the molding of these areas more refined. Gates 23 of different structures are respectively delivered to areas with different requirements, making the injection molding process more efficient. At the same time, the material supply of different areas can be met at the same time, reducing injection time and improving production efficiency. This targeted gate 23 design can make the filling of various parts of the product more uniform and reduce internal stress concentration. This improves the overall strength and stability of the product and reduces the risk of damage to the product during use.

[0043] Specifically, the bottom of the front mold core 4 is recessed inward to form a first positioning groove 41, and the upper end of the front mold core 4 is recessed inward to form a second positioning groove 42. The second positioning grooves 42 are distributed around the mold core 5 for the front mold core 4 and the rear mold core to be installed together.

[0044] In actual use, the first positioning groove 41 at the bottom of the front mold core 4 can play a role in precise positioning when other components are installed. The second positioning grooves 42 at the upper end are distributed around the mold core 5 and are used for the front mold core 4 to be installed in conjunction with the rear mold core. During the mold closing process, the corresponding positioning structure on the rear mold core cooperates with the second positioning groove 42, which can accurately align the positions of the front mold core 4 and the rear mold core in the horizontal direction, ensure the dimensional accuracy and shape accuracy of the injection molding space, and avoid quality problems such as dimensional deviation and flash in the product due to inaccurate installation. The design of the first positioning groove 41 and the second positioning groove 42 increases the stability of the front mold core 4 in the mold. During the injection molding process, the mold will be subjected to greater pressure and impact force. The positioning grooves can make the front mold core 4 tightly combined with other components, reduce the displacement caused by vibration and pressure changes, thereby improving the overall stability of the mold and extending the service life of the mold.

[0045] Specifically, a stripping insert 6 is provided on the pipe 8 , and a positioning boss 61 protruding outward from the stripping insert 6 cooperates with the positioning groove, and a clearance step 62 is formed between the positioning boss 61 and the stripping insert 6 .

[0046] In actual use, the positioning boss 61 on the stripping insert 6 cooperates with the positioning groove on the front mold core 4 to ensure that the position of the stripping insert 6 in the pipe 8 is accurate, achieve precise positioning, and avoid installation deviation of the stripping insert 6. This precise positioning method helps to improve the overall accuracy of the mold, allowing the injection molding material to flow smoothly in the pipe 8 and accurately enter the mold cavity, reducing problems such as material blockage and poor flow caused by inaccurate positioning, and improving the molding quality of the product. The cooperation between the positioning boss 61 and the positioning groove makes the connection between the stripping insert 6 and the front mold core 4 tighter and more stable. During the injection molding process, the mold will be subjected to greater pressure and impact force. This tight connection can prevent the stripping insert 6 from being displaced or loose, ensure that it can work stably, and improve the reliability of the mold. The design of the air avoidance step 62 can alleviate the stress concentration of the mold during operation to a certain extent, reduce the risk of damage to the stripping insert 6 and the front mold core 4 due to excessive stress, and extend the service life of the mold.

[0047] Specifically, the number of the hot runners 21 is set to be multiple, and the multiple branch runners 22 connected to the multiple hot runners 21 are connected to each other.

[0048] In actual use, the provision of multiple hot runners 21 can increase the inflow speed and flow rate of the injection molding material. When the injection molding machine injects the material into the mold, multiple hot runners 21 work simultaneously, and can deliver sufficient material to the branch channel 22 in a shorter time, thereby speeding up the injection molding process and improving production efficiency. Multiple hot runners 21 and interconnected branch channels 22 can make the injection molding material more evenly distributed throughout the mold cavity. This uniform material distribution can reduce stress concentration and defects inside the product, such as pores, shrinkage marks, etc., and improve the quality and appearance of the product. The interconnected branch channels 22 can also balance the pressure in different areas, avoid the situation where local pressure is too high or too low, ensure the consistent filling effect of various parts of the product, and improve the dimensional accuracy and stability of the product.

[0049] Specifically, cooling water channels 7 are provided on the front mold core 4 and the stripping insert 6 . The cooling water channels 7 are arranged in a well-shaped layout around the central axis of the pipeline 8 .

[0050] During actual use, cooling water channels 7 are set on the front mold core 4 and the stripping insert 6, which can quickly take away the heat generated during the injection molding process and quickly cool the product and the mold. This can greatly shorten the molding cycle of the product and improve production efficiency. The cooling water channels 7 are set in a well-shaped layout around the central axis of the pipe 8 to ensure the uniformity of the cooling effect. This layout can dissipate heat evenly from all directions, avoiding local overheating or overcooling, thereby ensuring the quality and dimensional stability of the product. Rapid cooling can reduce the shrinkage and deformation of the product during the cooling process. By controlling the cooling rate, the internal structure of the product can be made more uniform, stress concentration can be reduced, and the strength and durability of the product can be improved. Uniform cooling can also avoid defects on the product surface, such as bubbles, shrinkage marks, etc. The reasonable layout of the cooling water channels 7 can ensure that the surface temperature of the product drops evenly, making the product appearance smoother and more beautiful.

[0051] Specifically, the front mold base plate 1 is provided with a positioning ring 11 connected to the nozzle of an external injection molding machine, and a gate sleeve 12 screwed thereon for connecting to the nozzle of an external injection molding machine. The gate sleeve 12 passes through the front mold base plate 1 and is connected to the hot runner 21.

[0052] During actual use, a positioning ring 11 is provided on the front mold base plate 1, which can realize precise positioning and connection with the nozzle of an external injection molding machine. The positioning ring 11 ensures that the nozzle of the injection molding machine and the glue inlet of the mold can be quickly and accurately aligned during installation, reducing installation errors and improving the accuracy and stability of injection molding. The screwed gate sleeve 12 further enhances the connection stability with the nozzle of the external injection molding machine. The screw connection makes the connection more secure and can withstand the high pressure and impact force during the injection molding process, preventing loosening or leakage between the nozzle and the mold. The gate sleeve 12 passes through the front mold base plate 1 and is connected to the hot runner 21, providing a direct and smooth channel for the injection molding material. This design reduces the resistance of the material during the flow process, improves the glue feeding speed and efficiency, and ensures the smooth progress of the injection molding process.

[0053] Specifically, the hot flow plate 3 is provided with guide pillars 31 for cooperating with the rear mold for installation, and the number of the guide pillars 31 is set to be multiple.

[0054] During actual use, a plurality of guide pillars 31 are provided on the heat flow plate 3, which can play a role in precise positioning when being installed in conjunction with the rear mold. The plurality of guide pillars 31 can ensure the accuracy of the relative position between the heat flow plate 3 and the rear mold from different positions and angles, avoid installation deviations, and improve the overall accuracy of the mold. Accurate positioning helps to reduce injection molding problems caused by improper installation, such as material leakage, product size deviation, etc., thereby improving product quality and consistency. The distribution of multiple guide pillars 31 can make the connection between the heat flow plate 3 and the rear mold more stable. During the injection molding process, the mold will be subjected to greater pressure and impact force, and the plurality of guide pillars 31 can disperse these forces and reduce the risk of deformation and damage to the mold.

[0055] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there may be changes in the specific implementation methods and application scope. The content of this specification should not be understood as limiting the present invention.

Claims

1. A mobile phone plastic middle frame mold with an improved front mold glue inlet, characterized by: The invention comprises a front mold base plate (1), a glue inlet system (2), a heat flow plate (3) for providing a heat source for the glue inlet system (2), and a front mold core (4); the heat flow plate (3) is arranged on the front mold base plate (1); the upper end of the front mold core (4) protrudes outward to form a mold core (5) for cooperating with the mold cavity of the rear mold core to form an injection molding space; a pipe (8) is provided between the heat flow plate (3) and the front mold core (4) to connect the two for circulating injection molding material; the glue inlet system (2) comprises a hot runner (21) arranged in the pipe (8), a branch channel (22) arranged on the front mold core (4), and a gate (23) connected to the core (5); one end of the hot runner (21) passes through the heat flow plate (3) and is connected to the nozzle of an external injection molding machine; the other end extends to the bottom of the front mold core (4) and is connected to the branch channel (22); the branch channel (22) is connected to the gate (23) to transport injection molding material to the injection molding space.

2. The mobile phone plastic middle frame mold with an improved front mold glue inlet according to claim 1, characterized in that: A first flow hole (211), a second flow hole (212), a third flow hole (213) and a fourth flow hole (214) are provided at one end of the hot runner (21) close to the branch flow channel (22). The first flow hole (211), the second flow hole (212), the third flow hole (213) and the fourth flow hole (214) are arranged in sequence along the length direction of the pipe (8). The apertures of the first flow hole (211), the second flow hole (212) and the third flow hole (213) are successively smaller in transition, and the aperture of the third flow hole (213) is successively larger in transition from the third flow hole (213) to the fourth flow hole (214) in a trumpet shape.

3. The mobile phone plastic middle frame mold with an improved front mold glue inlet according to claim 1, characterized in that: The branch channel (22) has a plurality of branches (221) arranged and distributed around the central axis of the hot runner (21), and the plurality of branches (221) form a spoke-like structure with the hot runner (21) and the branch channel (22) as the center.

4. The mobile phone plastic middle frame mold with an improved front mold glue inlet according to claim 1, characterized in that: The gate (23) comprises a first feed port (231) in a curved fan-shaped structure and a second feed port (232) in a pin-point structure. The first feed port (231) is used to transport injection molding material to an area with a larger injection volume, and the second feed port (232) is used to transport injection molding material to a thin-walled area or an area with a smaller injection volume.

5. The mobile phone plastic middle frame mold with an improved front mold glue inlet according to claim 1, characterized in that: The bottom of the front mold core (4) is recessed inward to form a first positioning groove (41), and the upper end of the front mold core (4) is recessed inward to form a second positioning groove (42). The second positioning grooves (42) are distributed around the mold core (5) for the front mold core (4) and the rear mold core to be installed in coordination.

6. The improved front mold glue inlet mobile phone plastic middle frame mold according to claim 5, characterized in that: A stripping insert (6) is provided on the pipe (8). A positioning boss (61) is formed on the stripping insert (6) and matches the positioning groove. A space-avoiding step (62) is formed between the positioning boss (61) and the stripping insert (6).

7. The mobile phone plastic middle frame mold with an improved front mold glue inlet according to claim 1, characterized in that: The number of hot runners (21) is set to be multiple, and the multiple branch runners (22) connected to the multiple hot runners (21) are connected to each other.

8. The mobile phone plastic middle frame mold with an improved front mold glue inlet according to claim 6, characterized in that: The front mold core (4) and the stripping insert (6) are both provided with cooling water channels (7), and the cooling water channels (7) are arranged in a well-shaped layout around the central axis of the pipeline (8).

9. The mobile phone plastic middle frame mold with an improved front mold glue inlet according to claim 1, characterized in that: The front mold base plate (1) is provided with a positioning ring (11) for positioning and connecting with the nozzle of an external injection molding machine, and a sprue sleeve (12) is screwed thereon for connecting with the nozzle of the external injection molding machine. The sprue sleeve (12) passes through the front mold base plate (1) and is connected with the hot runner (21).

10. The mobile phone plastic middle frame mold with improved front mold glue inlet according to claim 1, characterized in that: The hot flow plate (3) is provided with guide pillars (31) for being mounted in conjunction with the rear mold, and the number of the guide pillars (31) is set to be multiple.

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