Center feeding mold

Abstract

The mold comprises a rear mold body, a front mold body, a mold cavity mechanism, a mold core mechanism, a side core pulling mechanism and a flow guide cone mechanism, the rear mold body is provided with a mold sprue penetrating through the rear mold body and the mold cavity mechanism and used for allowing the flow guide cone mechanism to be inserted therein, and the mold sprue is located in the middle of the rear mold body; the mold sprue in the middle of the rear mold is matched with the flow guide cone mechanism to realize central feeding, so that a fluid material can be uniformly diffused and filled from the center of the mold cavity to the peripheral edge; not only is the longest flow path for melt to reach everywhere shortened and the filling efficiency of injection molding improved, but also radiation heat in the mold is distributed more uniformly and symmetrically, and thermal stress and product deformation caused by temperature difference are reduced; due to the design of the center feeding structure, the overall size of the die in the length-width direction is more compact and smaller, and the using amount of die steel and the production line installation space are saved.

Description

Technical Field

[0001] This application relates to the field of mold forming technology, and in particular to a center-feed mold. Background Technology

[0002] The mainstream products in the current injection mold market mostly adopt the traditional channel layout structure with single-sided feeding and single-sided discharge. This single-sided pushing design results in a long flow path and uneven stress of the melt during the filling process, which easily leads to higher temperature on the inlet side and lower temperature on the outlet side, causing an imbalance in the internal temperature field of the mold. At the same time, under the same workpiece processing conditions, the mold needs to reserve a huge amount of extra space for the single-sided feeding channel, resulting in a bulky and large mold size, which limits the applicability of multi-cavity molds on compact equipment. Summary of the Invention

[0003] In order to improve the shortcomings of the existing technology, such as low filling efficiency, uneven temperature and large mold volume caused by single-sided feeding, this application provides a mold with center feeding.

[0004] The center-feed mold provided in this application adopts the following technical solution: A center-feed mold includes a rear mold, a front mold corresponding to the rear mold, a cavity mechanism connected to the rear mold, a core mechanism connected to the front mold, a side core-pulling mechanism connected to the front mold and located on one side of the core mechanism, and a guide cone mechanism connected to the middle position of the core mechanism. The rear mold is provided with a mold gate that penetrates the rear mold and the cavity mechanism and is used for the guide cone mechanism to be inserted. The mold gate is located at the middle position of the rear mold.

[0005] By adopting the above technical solution, the mold gate in the middle of the rear mold is used in conjunction with the guide cone mechanism to achieve center feeding, so that the fluid material can be evenly diffused and filled from the center of the mold cavity to the surrounding edges. This not only shortens the longest flow path of the melt to reach all places and improves the filling efficiency of injection molding, but also makes the distribution of radiant heat inside the mold more uniform and symmetrical, reducing thermal stress and product deformation caused by temperature difference. The center feeding structure design makes the overall size of the mold more compact in the length and width directions, saving the amount of mold steel and production line installation space.

[0006] Preferably, the cavity mechanism and the core mechanism are arranged to form a mold forming cavity; the front mold is provided with a first slag bag groove located around the core mechanism and closely attached to the core mechanism, and the rear mold is provided with a second slag bag groove located around the cavity mechanism and corresponding to the first slag bag groove. The first slag bag groove and the second slag bag groove are arranged to form a waste collection slag bag that communicates with the mold forming cavity.

[0007] Preferably, the front mold is further provided with a first discharge trough communicating with the first slag bag trough, and the rear mold is provided with a second discharge trough communicating with the second slag bag trough and correspondingly arranged with the first discharge trough. The first discharge trough and the second discharge trough are arranged to form a discharge pipeline communicating with the waste collection slag bag.

[0008] By adopting the above technical solution, a waste collection slag bag composed of a first slag bag groove and a second slag bag groove is set around the periphery of the core and cavity, and is connected to the discharge pipe. When the melt fed from the center flows to the periphery, the cold material with a lower temperature at the front of the flow wave, surface oxide inclusions, and the original gas in the pipe can be smoothly pushed and contained into the waste collection slag bag around the periphery, avoiding the structural strength reduction and cold shut defects caused by the retention of inferior cold material in the mold forming cavity. The design of the discharge pipe further ensures the smooth flow and centralized discharge of waste, improving the internal density and appearance yield of the molded product.

[0009] Preferably, the front mold is provided with a first venting mechanism that is connected to both sides of the front mold, and the rear mold is provided with a second venting mechanism that is connected to both sides of the rear mold and is correspondingly arranged with the first venting mechanism.

[0010] Preferably, the first venting mechanism includes a first venting base fixedly connected to the front mold and a first wave-shaped venting component fixedly connected to the venting base. The venting base is provided with an venting groove communicating with the first discharge groove, and the first wave-shaped venting component is located at one end of the venting groove.

[0011] Preferably, the first wave-shaped exhaust assembly has an exhaust gap, and the second exhaust mechanism includes a second exhaust base fixedly connected to the rear mold, a guide flange connected to the second exhaust base and used for insertion into the exhaust gap, and a second wave-shaped exhaust assembly connected to the second exhaust base and used for meshing with the first wave-shaped exhaust assembly. The second exhaust base has an exhaust assembly insertion slot for the first wave-shaped exhaust assembly to be inserted into, and the guide flange and the second wave-shaped exhaust assembly are both located in the exhaust assembly insertion slot.

[0012] By adopting the above technical solution, the staggered combination of the first and second venting mechanisms, and the interlocking and plugging of the first and second wave-shaped venting components, constructs a multi-level labyrinthine flow-blocking venting structure. The venting gaps allow the gas in the mold cavity to be discharged without obstruction, reducing the risk of peripheral air entrapment and porosity caused by the center being squeezed outwards. When high-temperature, high-density fluid material follows the gas to the venting area, the interference of the tortuous path formed by the wave-shaped components forces the fluid to continuously impact the wall and change its flow direction, consuming the fluid's kinetic energy and accelerating the cooling and solidification of the fluid by utilizing the increased contact area. This achieves the effect of venting only and preventing material leakage, ensuring the smoothness of mold venting.

[0013] Preferably, the side core-pulling mechanism includes a side core-pulling base fixedly connected to the front mold, a side core-pulling cylinder connected to the side core-pulling base, a connecting guide slide rail fixed to the front mold, and a side core-pulling body connected to the output end of the side core-pulling cylinder and movably inserted on both sides of the connecting guide slide rail, wherein the side core-pulling body is located on one side of the core mechanism.

[0014] By adopting the above technical solution, using the side core-pulling cylinder as the power source and combining it with the connecting guide slide rail for linear guidance, it can meet the molding requirements of complex workpieces with deep holes, side grooves and other structures that cannot be directly demolded. This application ensures that the side core-pulling body can maintain the positional accuracy of reciprocating motion when facing the radial side pressure brought by the center feed through the double-sided stable support of the connecting guide slide rail, effectively reducing the off-center load jamming of the slider and improving the diversity and reliability of the mold for molding complex products.

[0015] Preferably, the guide cone mechanism is provided with an inclined guide slope, and the guide cone mechanism is also provided with a feed guide groove located on one side of the inclined guide slope, and the core mechanism is provided with a flow channel communicating with the feed guide groove.

[0016] By adopting the above technical solution, the inclined guide slope can smoothly convert the injected central feed melt flow, cutting the melt from the longitudinal impact force and guiding it to radial flow around it, reducing the shear heat, flow marks and local stress concentration generated by the melt hitting the bottom of the cavity; together with the feed guide groove and the flow channel on the core mechanism, the fluid wavefront morphology is further sorted out, preventing the generation of fluid dead zones, eddies and turbulence, and ensuring the smooth and uniform filling process of the melt from the center to the periphery.

[0017] Preferably, the outer wall of the rear mold is further provided with a pressure regulating drive mechanism, a pressure regulating push rod connected to the output end of the pressure regulating drive mechanism and passing through the rear mold, and an outlet pressure detection mechanism connected to the end of the pressure regulating push rod and extending into the second slag bag groove. The outlet pressure detection mechanism is electrically connected to the pressure regulating drive mechanism, and an inlet pressure detection mechanism electrically connected to the pressure regulating drive mechanism is provided on the inclined guide slope.

[0018] By adopting the above technical solution, during the melt filling process, the outlet pressure detection mechanism and the inlet pressure detection mechanism dynamically monitor the pressure difference data between the central inlet area and the outer outlet slag bag area in real time. When an imbalance of flow resistance in various directions is detected, the pressure adjustment drive mechanism drives the pressure adjustment push rod to extend or retract inward, using physical interference to change the local flow channel resistance. This enables the mold to adaptively balance the flow velocity and pressure of each branch, reducing material shortage and flash overflow caused by unstable flow from the center to the periphery.

[0019] Preferably, the front mold is further provided with a spiral cooling water channel and a heat-insulating heating oil channel located around the spiral cooling water channel.

[0020] By adopting the above technical solution, the residual heat is removed by the spiral cooling water channel in the center, and the heat is replenished by the heat-insulating heating oil channel in the periphery, forming a reverse temperature control intervention; this application reduces the temperature difference between the middle and boundary areas, improves the consistency of the product molding shrinkage rate, and effectively ensures the overall flatness of the injection molded structural parts.

[0021] In summary, this application includes at least one of the following beneficial technical effects: 1. The mold gate located in the middle of the rear mold, combined with the guide cone mechanism, enables center feeding, allowing the fluid material to diffuse and fill evenly from the center of the mold cavity to the surrounding edges. This not only shortens the longest flow path of the melt to reach various points and improves the filling efficiency of injection molding, but also makes the distribution of radiant heat inside the mold more uniform and symmetrical, reducing thermal stress and product deformation caused by temperature differences. The center feeding structure design makes the overall dimensions of the mold more compact in the length and width directions, saving the amount of mold steel and production line installation space. 2. During the melt filling process, the outlet pressure detection mechanism and the inlet pressure detection mechanism dynamically monitor the pressure difference data between the central inlet area and the outer outlet slag bag area in real time. When an imbalance of flow resistance in various directions is detected, the pressure adjustment drive mechanism drives the pressure adjustment push rod to extend or retract inward, using physical interference to change the local flow channel resistance; this allows the mold to adaptively balance the flow velocity and pressure of each branch, reducing material shortage and flash overflow caused by unstable flow from the center to the periphery. 3. By using a spiral cooling water path to remove excess heat at the center and coordinating with a heat-insulating and heating oil path around the perimeter for circulating heat replenishment, a reverse temperature control intervention is formed; this application reduces the temperature difference between the middle and boundary areas, improves the consistency of the product molding shrinkage rate, and effectively ensures the overall flatness of the injection molded structural parts. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the exploded structure of an embodiment of this application. Figure 1 .

[0023] Figure 2 This is a schematic diagram of the exploded structure of an embodiment of this application. Figure 2 .

[0024] Figure 3 This is a cross-sectional view of an embodiment of this application. Figure 1 .

[0025] Figure 4 This is a cross-sectional view of an embodiment of this application. Figure 2 .

[0026] Explanation of reference numerals in the attached figures: 1. Rear mold; 2. Front mold; 3. Cavity mechanism; 4. Core mechanism; 41. Drainage channel; 5. Side core pulling mechanism; 51. Side core pulling base; 52. Side core pulling cylinder; 53. Connecting guide rail; 54. Side core pulling body; 6. Guide cone mechanism; 61. Inclined guide slope; 62. Feed guide groove; 7. Mold gate; 8. Mold forming cavity; 9. First slag bag groove; 10. Second slag bag groove; 11. Waste collection slag bag; 12. First discharge groove; 13. Second discharge groove; 14. Discharge pipe; 5. First exhaust mechanism; 151. First exhaust base; 152. First wave-shaped exhaust assembly; 153. Exhaust groove; 154. Exhaust gap; 16. Second exhaust mechanism; 161. Second exhaust base; 162. Air guide flange; 163. Second wave-shaped exhaust assembly; 164. Exhaust assembly insertion slot; 17. Pressure regulation drive mechanism; 18. Pressure regulation push rod; 19. Outlet pressure detection mechanism; 20. Inlet pressure detection mechanism; 21. Spiral cooling water circuit; 22. Heat preservation and heating oil circuit. Detailed Implementation

[0027] The following is in conjunction with the appendix Figures 1 to 4 This application will be described in further detail.

[0028] This application discloses a center-feed mold. (Refer to...) Figure 1 and Figure 2A center-feed mold includes a rear mold 1, a front mold 2 corresponding to and closed to the rear mold 1, a cavity mechanism 3 connected and positioned to the rear mold 1 in an embedded manner, a core mechanism 4 connected to the front mold 2, a side core-pulling mechanism 5 connected to the front mold 2 and located on one side of the core mechanism 4, and a guide cone mechanism 6 fixedly connected to the center position of the core mechanism 4; wherein, the rear mold 1 is provided with a mold gate 7 that penetrates the rear mold 1 itself and the cavity mechanism 3, the mold gate 7 is used for the injection nozzle of the injection molding machine to abut, and for the guide cone mechanism 6 to be inserted and fitted, and the mold gate 7 is located at the middle position of the rear mold 1.

[0029] In actual production, the high-temperature, high-pressure fluid material from the injection molding machine is directly injected into the mold gate 7 through the front nozzle. Since the mold gate 7 is located in the middle, after the fluid material enters, it first impacts the guide cone mechanism 6, and is then forced to change its original single downward vertical movement direction, thus diverting the fluid material and filling it towards the edge of the mold cavity. This application adopts a central distribution design with the mold gate 7 and the guide cone mechanism 6 working together, which makes the longest stroke of the melt to the four edges of the product basically consistent, avoiding the problems of material shortage and pressure loss at the end caused by single-sided feeding. At the same time, the distribution of the feeding and discharging system is more symmetrical and concentrated, reducing the redundancy of the mold's single-sided layout, reducing the overall size of the mold, and facilitating workshop production scheduling and maintenance. The fluid material is a melt.

[0030] Furthermore, such as Figures 1 to 3 As shown, the concave contour of the cavity mechanism 3 and the convex contour of the core mechanism 4 of this application interlock and surround each other after the mold is closed, and the gap formed in the middle is the mold forming cavity 8. On the plane of the front mold 2, a plurality of first slag pocket grooves 9 are milled around the outer periphery of the core mechanism 4. Correspondingly, a plurality of second slag pocket grooves 10 are milled around the outer periphery of the cavity mechanism 3 on the rear mold 1. In the mold closing state, the first slag pocket grooves 9 and the second slag pocket grooves 10 are precisely engaged and aligned, forming a waste collection slag pocket 11 that is connected to the side end of the mold forming cavity 8. A first discharge groove 12 is opened on the front mold 2 along the first slag pocket groove 9, and a second discharge groove 13 is opened on the rear mold 1 along the second slag pocket groove 10. The first discharge groove 12 and the second discharge groove 13 are connected to form a discharge pipe 14 for discharging waste to the outside of the mold.

[0031] During center-feed filling, the material squeezed to the forefront of the fluid wavefront is typically the air already present in the mold cavity, volatile release agent gases, and condensed material and oxides generated by the temperature drop at the front of the liquid. This application addresses this by configuring a waste collection slag bag 11, consisting of a first slag bag 9 and a second slag bag 10, on the outside of the molding cavity. Combined with the "displacement effect" from the center outwards, this allows inferior impurities to be unimpededly driven to the waste collection slag bag 11 for temporary storage. Subsequently, excess fluid or waste, under pressure, can be discharged through the discharge pipe 14, consisting of a first discharge trough 12 and a second discharge trough 13. This ensures that the melt remaining in the mold molding cavity 8 is of a more uniform temperature and higher purity, reducing the risk of cold shuts and decreased density on the final molded product.

[0032] Furthermore, such as Figure 1 and Figure 3 As shown, this application has a first venting mechanism 15 bolted to the left and right sides of the front mold 2, and a second venting mechanism 16 fixed to the corresponding side of the rear mold 1. The first venting mechanism 15 includes a first venting base 151 fixed to the front mold 2, and a first wave-shaped venting assembly 152 machined on the first venting base 151. The venting groove 153 on the first venting base 151 communicates with the first discharge groove 12. The first wave-shaped venting assembly 152 is located at the throat end of the venting groove 153 facing outward. The first wave-shaped venting assembly 152 is provided with a venting gap 154. The second venting mechanism 16 includes a second venting base 161 fixed to the rear mold 1, and a second venting base... The base 161 is provided with an air guide flange 162 protruding away from the second exhaust base 161. The air guide flange 162 is precisely inserted into the exhaust gap 154 ​​when the mold is closed. The second exhaust base 161 is also provided with a second wave-shaped exhaust component 163. After the mold is closed, the second wave-shaped exhaust component 163 and the first wave-shaped exhaust component 152 are in a non-contact misaligned engagement state. The air guide flange 162 and the second wave-shaped exhaust component 163 are both housed in the exhaust component insertion slot 164 opened in the second exhaust base 161.

[0033] When the center injection begins, the gas in the mold forming cavity 8 is compressed and pushed to the periphery. The low-viscosity gas can pass smoothly through the narrow wave gap formed by the misalignment and meshing between the first wave-shaped venting component 152 and the second wave-shaped venting component 163. When high-viscosity, high-density molten metal or plastic rushes into the venting groove 153, the melt is forced to make an impact turn due to the S-shaped wave of the channel. The kinetic energy of the melt is quickly consumed in this labyrinth. The wave structure increases the contact heat dissipation area between the metal mold and the melt, causing the melt to be deprived of heat and solidify in the gap after entering a short flow distance, thus achieving venting to prevent flashing and material leakage.

[0034] Specifically, such as Figure 1As shown, the side core-pulling mechanism 5 of this application includes a side core-pulling base 51 fastened to the side of the front mold 2 by screws. A side core-pulling cylinder 52 that provides push-pull power is installed on the side core-pulling base 51. A connecting guide slide rail 53 is embedded on the surface of the front mold 2. The tail of the side core-pulling body 54 is pin-connected to the piston rod output end of the side core-pulling cylinder 52. The connecting guide slide rail 53 is provided with a dovetail groove or T-slot structure. The side core-pulling body 54 is movably inserted and slidably fitted on the connecting guide slide rail 53. The front forming part of the side core-pulling body 54 is located on one side of the core mechanism 4 and is used to insert into the forming side hole of the mold cavity. This application utilizes a connecting guide rail 53 fixed on the front mold 2 to provide a rigid anti-lateral displacement clamping force for the side core-pulling body 54; before injection molding, the side core-pulling cylinder 52 pushes the side core-pulling body 54 to slide smoothly into the molding position along the guide rail; in the stage before mold opening and demolding, the side core-pulling cylinder 52 pulls back, driving the side core-pulling body 54 to translate and be pulled out; this application ensures that the demolding action is accurate and does not jam when the mold is dealing with three-dimensional complex products with side holes or grooves.

[0035] More specifically, such as Figure 1 As shown, the top of the centrally installed guide cone mechanism 6 of this application is provided with an inclined guide slope 61, and a dispersed feed guide groove 62 extends below the inclined guide slope 61. The interior or surface of the core mechanism 4 is provided with a flow channel 41 that seamlessly connects with the feed guide groove 62. The flow channel 41 is a guide groove that extends outwards in all directions.

[0036] After the melt is injected from the mold gate 7, it first makes tangential contact with the inclined guide slope 61. The impact force is gently dissolved by the slope and is evenly cut by inertia, sliding down the inclined angle into the feed guide groove 62 below. The melt flows smoothly into the guide channel 41 on the core mechanism 4 without turbulence and diffuses in all directions. This application streamlines the laminar flow pattern of the jet, reduces inlet resistance and flow marks, and ensures that the molded body has a dense structure and a smooth surface.

[0037] In addition, such as Figure 1 and Figure 3 As shown, in order to achieve dynamic adaptive control of the internal pressure of the mold forming cavity, a pressure regulating drive mechanism 17, preferably a hydraulic cylinder or a hydraulic pump, is fixedly installed on the outer wall of the rear mold 1. The power output end of the pressure regulating drive mechanism 17 is directly connected to a pressure regulating push rod 18, which is a direct telescopic actuator. The pressure regulating push rod 18 slides through the interior of the rear mold 1. The end of the pressure regulating push rod 18 is connected to an outlet pressure detection mechanism 19 that extends into the second slag packing groove 10. At the same time, an inlet pressure detection mechanism 20 is embedded in the inclined guide slope 61 of the guide cone mechanism 6. Both the outlet pressure detection mechanism 19 and the inlet pressure detection mechanism 20 are electrically connected to the control circuit of the pressure regulating drive mechanism 17 to form a closed-loop feedback system. During the actual injection molding process, the inlet pressure detection mechanism 20, located at the inclined guide slope 61, collects the initial injection high pressure signal from the central inlet in real time, while the outlet pressure detection mechanism 19, located in the second slag trap 10 at the end of the mold cavity, simultaneously collects the end pressure signal as the melt reaches the outer edge. When the dynamic pressure difference data between the injection high pressure signal and the end pressure signal is fed back to the pressure regulating drive mechanism 17 and is determined to be an imbalance in the flow channel filling, the pressure regulating drive mechanism 17 receives the electrical signal and outputs the liquid pressure, directly driving the pressure regulating push rod 18 to overcome the internal pressure of the mold. The melt back pressure extends forward, thereby forcibly reducing the local flow channel cross-sectional area to increase flow resistance, or retreats backward to increase the local cross-sectional area and release fluid resistance; through the linkage of the above components, this application constructs a rapidly responsive in-mold physical interception compensation mechanism, which can intervene in real time during the filling cycle and balance the flow velocity and pressure wave front of each branch, reducing molding problems such as local material shortages, short shots, deviation, overflow, and internal thermal stress residue that are prone to occur when complex asymmetrical workpieces are fed from the center, and improving the overall structural density, dimensional stability, and mass production yield of the molded products; Both the outlet pressure detection mechanism 19 and the inlet pressure detection mechanism 20 are preferably pressure sensors.

[0038] And, as Figure 4 As shown, the front mold 2 of this application has a spiral cooling water channel 21 densely coiled in the area near the center of the core mechanism 4; and in the peripheral boundary area of ​​the front mold 2 away from the center, a heat-insulating heating oil channel 22 connected to high-temperature hot oil is pre-embedded or drilled.

[0039] Since all the high-temperature melt first gathers in the center and continuously transfers heat to the surrounding areas, it will cause a polarization in the central area of ​​the central feed mold, where high heat accumulation occurs and the outer edges lose temperature too quickly. This application intervenes by applying temperature control in the opposite direction: cooling water is introduced into the center and the spiral cooling water channel 21 is used to remove the accumulated residual heat; the heat preservation and heating oil channel 22 is activated in the periphery to use hot oil circulation to supplement the heat of the weak edge areas; the temperature difference between the middle area and the boundary area is reduced, the consistency of the product molding shrinkage rate is improved, and the flatness of the injection molded structural parts is ensured.

[0040] The implementation principle of a center-feed mold in this application embodiment is as follows: In the open mold state, the side core-pulling cylinder 52 pushes the side core-pulling body 54 into the mold closing preparation position. After the mold is locked, high-temperature fluid is injected from the central mold gate 7, and then impacts the inclined guide slope 61 of the guide cone mechanism 6 and is smoothly diverted to the feed guide groove 62 and the drainage channel 41, and then spreads and fills the mold forming cavity 8 radially. During filling, the inlet pressure detection mechanism 20 and the outlet pressure detection mechanism 19 detect the pressure difference in real time, and control the pressure adjustment drive mechanism 17 to fine-tune the pressure adjustment push rod 18 to ensure that each branch advances synchronously and evenly. The cold air in the mold cavity that is squeezed in front is discharged through the gap of the first exhaust mechanism 15 and the second exhaust mechanism 16, while the oxidized cold material at the forefront is pushed into the waste collection slag bag 11 composed of the first slag bag groove 9 and the second slag bag groove 10 for isolation. After filling, pressure holding and cooling are performed. At this time, the central spiral cooling water channel 21 for strong cooling and heat removal, and the surrounding heat-replenishing oil channel 22 work together to ensure that the product isothermally cured and molded throughout. The side core-pulling mechanism 5 retracts and withdraws, the mold opens and the good product is ejected. This application reduces the mold volume, melt flow ratio, and cooling deformation by using a central feeding structure combined with labyrinth venting, side-pulling linkage, dynamic damping fine adjustment, and internal and external temperature control gradient design. While reducing the mold volume, it ensures the precision dimensions and quality of the product.

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A center-feed mold, characterized in that, It includes a rear mold (1), a front mold (2) corresponding to the rear mold (1), a cavity mechanism (3) connected to the rear mold (1), a core mechanism (4) connected to the front mold (2), a side core pulling mechanism (5) connected to the front mold (2) and located on one side of the core mechanism (4), and a guide cone mechanism (6) connected to the middle position of the core mechanism (4). The rear mold (1) is provided with a mold gate (7) that penetrates the rear mold (1) and the cavity mechanism (3) and is used for the guide cone mechanism (6) to be inserted. The mold gate (7) is located in the middle position of the rear mold (1).

2. The center-feed mold according to claim 1, characterized in that, The cavity mechanism (3) and the core mechanism (4) are arranged to form a mold forming cavity (8); the front mold (2) is provided with a first slag packing groove (9) located around the core mechanism (4) and close to the core mechanism (4); the rear mold (1) is provided with a second slag packing groove (10) located around the cavity mechanism (3) and corresponding to the first slag packing groove (9); the first slag packing groove (9) and the second slag packing groove (10) are arranged to form a waste collection slag packing (11) communicating with the mold forming cavity (8).

3. A center-feed mold according to claim 2, characterized in that, The front mold (2) is also provided with a first discharge trough (12) that communicates with the first slag bag trough (9), and the rear mold (1) is provided with a second discharge trough (13) that communicates with the second slag bag trough (10) and is correspondingly arranged with the first discharge trough (12). The first discharge trough (12) and the second discharge trough (13) are arranged to form a discharge pipeline (14) that communicates with the waste collection slag bag (11).

4. A center-feed mold according to claim 3, characterized in that, The front mold (2) is provided with a first exhaust mechanism (15) that is connected to both sides of the front mold (2), and the rear mold (1) is provided with a second exhaust mechanism (16) that is connected to both sides of the rear mold (1) and is correspondingly arranged with the first exhaust mechanism (15).

5. A center-feed mold according to claim 4, characterized in that, The first exhaust mechanism (15) includes a first exhaust base (151) fixedly connected to the front mold (2) and a first wave-shaped exhaust assembly (152) fixedly connected to the first exhaust base (151). The first exhaust base (151) is provided with an exhaust groove (153) communicating with the first discharge groove (12). The first wave-shaped exhaust assembly (152) is located at one end of the exhaust groove (153).

6. A center-feed mold according to claim 5, characterized in that, The first wave-shaped exhaust assembly (152) is provided with an exhaust gap (154). The second exhaust mechanism (16) includes a second exhaust base (161) fixedly connected to the rear mold (1), a guide flange (162) connected to the second exhaust base (161) and used to be inserted into the exhaust gap (154), and a second wave-shaped exhaust assembly (163) connected to the second exhaust base (161) and used to engage with the first wave-shaped exhaust assembly (152). The second exhaust base (161) is provided with an exhaust assembly insertion groove (164) for the first wave-shaped exhaust assembly (152) to be inserted. The guide flange (162) and the second wave-shaped exhaust assembly (163) are both located in the exhaust assembly insertion groove (164).

7. A center-feed mold according to claim 1, characterized in that, The side core pulling mechanism (5) includes a side core pulling base (51) fixedly connected to the front mold (2), a side core pulling cylinder (52) connected to the side core pulling base (51), a connecting guide slide rail (53) fixed to the front mold (2), and a side core pulling body (54) connected to the output end of the side core pulling cylinder (52) and movably inserted on both sides of the connecting guide slide rail (53). The side core pulling body (54) is located on one side of the core mechanism (4).

8. A center-feed mold according to claim 2, characterized in that, The guide cone mechanism (6) is provided with an inclined guide slope (61), and the guide cone mechanism (6) is also provided with a feed guide groove (62) located on one side of the inclined guide slope (61). The core mechanism (4) is provided with a flow channel (41) connected to the feed guide groove (62).

9. A center-feed mold according to claim 8, characterized in that, The outer wall of the rear mold (1) is also provided with a pressure regulating drive mechanism (17), a pressure regulating push rod (18) connected to the output end of the pressure regulating drive mechanism (17) and passing through the rear mold (1), and an outlet pressure detection mechanism (19) connected to the end of the pressure regulating push rod (18) and extending into the second slag bag tank (10). The outlet pressure detection mechanism (19) is electrically connected to the pressure regulating drive mechanism (17). The inclined guide slope (61) is provided with an inlet pressure detection mechanism (20) electrically connected to the pressure regulating drive mechanism (17).

10. A center-feed mold according to claim 1, characterized in that, The front mold (2) is also provided with a spiral cooling water channel (21) and a heat preservation and heating oil channel (22) located around the spiral cooling water channel (21).

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