Die-casting die of gearbox electric control side shell

Abstract

The invention relates to the technical field of die-casting dies, and discloses a die-casting die of a gearbox electric control side shell, which comprises a movable die core, a fixed die core, a left core-pulling mechanism, a right core-pulling mechanism and a lower core-pulling mechanism, an ultra-long channel cavity extending transversely is formed in the mold cavity, a left extrusion rod extends into the left end of the ultra-long channel cavity, a right extrusion rod extends into the right end of the ultra-long channel cavity, and the left extrusion rod and the right extrusion rod are coaxially arranged and disconnected, so that a solid casting section located between the left extrusion rod and the right extrusion rod is formed in the ultra-long channel cavity. The rear extrusion rod is driven by the extrusion driving mechanism to extrude towards or be away from the solid casting section. According to the die-casting die for the gearbox electric control side shell, the left extrusion rod and the right extrusion rod reduce the solid material amount from the two ends of the ultra-long channel cavity and apply pressure, the rear extrusion rod precisely pressurizes the middle solid casting section from the rear side, and the multidirectional three-dimensional extrusion effect is formed; and the problem of sealing failure or cooling efficiency reduction caused by the shrinkage cavity is thoroughly avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of die-casting dies, in particular to a die-casting die for an electronic control side housing of a gear box. Background Art

[0002] In the automotive parts manufacturing industry, the gearbox electronic control housing is a critical component, and its performance directly impacts the overall operating efficiency and stability of the gearbox. This housing is typically die-cast and requires a 300mm-long cooling channel extending from side to side to ensure effective heat dissipation during gearbox operation.

[0003] The traditional method for forming these cooling channels involves first casting a solid body containing the cooling channel locations, then machining and drilling holes to form the cooling channels running through it. However, due to the large volume of solid material, the molten metal shrinks unevenly during the die-casting solidification process, which can easily cause shrinkage defects in the corresponding locations of the cooling channels. These shrinkage holes not only affect the sealing and heat dissipation efficiency of the cooling channels, but in severe cases, can even cause the cooling channels to fail, thereby affecting the normal operation of the gearbox.

[0004] To address shrinkage cavities, the current mainstream approach involves inserting an extrusion rod at each end of the extra-long cavity forming the cooling channel. The two rods are then butted together to form a connected structure. This approach reduces the amount of solid material and improves shrinkage feeding. Furthermore, the extrusion rods exert pressure on the liquid metal inside the cavity, forcing it to fill the cavity more densely and reducing the likelihood of defects like shrinkage cavities.

[0005] However, when faced with the extra-long cooling channel of up to 300mm on the electronic control side housing of the gearbox, this conventional extrusion rod setting method exposed many problems. On the one hand, the internal aperture size of the cooling channel is strictly required, and at the same time, the extrusion rod needs to be set with a draft taper to facilitate demolding, causing the diameter of the free end of the extrusion rod to gradually decrease with increasing length. On the other hand, if the diameter of the extrusion rod is designed to be too small and the length is too long, the structural strength of the extrusion rod itself will be greatly reduced. In the actual casting process, the high-pressure and high-speed filling of the molten metal will exert a strong impact force on the extrusion rod. The extrusion rod with low structural strength is very easy to bend and damage under the action of this impact force, and it is impossible to stably extrude the molten metal, and the quality of the casting is difficult to guarantee.

[0006] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the Invention

[0007] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a die-casting mold for the electronic control side housing of a gearbox that can reliably and high-quality mold an ultra-long cooling channel.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A die-casting mold for a gearbox electronic control side housing, comprising a movable mold frame, a fixed mold frame, a movable mold core arranged on the movable mold frame, a fixed mold core arranged on the fixed mold frame, a left core-pulling mechanism and a right core-pulling mechanism for core-pulling the side of the gearbox electronic control side housing, and a lower core-pulling mechanism for core-pulling the bottom of the gearbox electronic control side housing; the fixed mold core, the movable mold core, the left core-pulling slider of the left core-pulling mechanism, the right core-pulling slider of the right core-pulling mechanism, and the lower core-pulling slider of the lower core-pulling mechanism are combined to form a mold cavity, a transversely extending extra-long channel cavity is formed in the mold cavity, and a left end of the extra-long channel cavity extends into A right extrusion rod is extended into the right end of the extrusion rod, and the left extrusion rod and the right extrusion rod are coaxially arranged and disconnected, so that a solid casting section located between the left extrusion rod and the right extrusion rod is formed in the super-long channel cavity. The left extrusion rod is arranged on the left core-pulling mechanism, and the right extrusion rod is arranged on the right core-pulling mechanism. The movable mold core is provided with at least one rear extrusion rod of the solid casting section extending from the back to the front into the super-long channel cavity. The rear extrusion rod is driven by the extrusion drive mechanism to squeeze toward or away from the solid casting section; a diverter cone is provided on the lower core-pulling mechanism, and a gate sleeve cooperating with the diverter cone is provided on the fixed mold core.

[0010] As a further improvement of the above technical solution, the length of the super-long channel cavity is greater than 300 mm, the extrusion sections of the left extrusion rod and the right extrusion rod both have a draft taper and the diameter of the free end of the extrusion section is greater than 5 mm, and the spacing between the left extrusion rod and the right extrusion rod is less than 80 mm.

[0011] As a further improvement of the above technical solution, the extrusion drive mechanism includes a first oil cylinder arranged on the back plate of the movable mold frame, a first sleeve arranged on the movable mold core for guiding the movement of the rear extrusion rod, and a first pressure block for locking the position of the first sleeve. The piston rod end of the first oil cylinder is driven and connected to the tail end of the rear extrusion rod.

[0012] As a further improvement of the above technical solution, the interior of the first sleeve is a countersunk hole structure, and the countersunk part of the countersunk hole is located at the end close to the solid casting section.

[0013] As a further improvement of the above technical solution, the lower core pulling mechanism includes a lower seat slidably arranged on the movable mold frame, a lower core pulling slider detachably arranged on the end of the lower seat facing the movable mold core, and a first core pulling drive mechanism for driving the lower seat and the lower core pulling slider to approach or move away from the movable mold core. The diverter cone is clamped between the lower core pulling slider and the lower seat. The diverter cone includes a base and a truncated cone head integrally formed with the base. The truncated cone head is provided with a concave guide notch, and the concave guide notch is provided with a positioning groove on the end surface facing the movable mold core.

[0014] As a further improvement of the above technical solution, the cross-section of the base of the diverter cone is an arc shape, a positioning block is provided on the end face of the lower slide seat facing the lower core-pulling slider, a positioning groove adapted to the positioning block is provided on the lower core-pulling slider, and the lower slide seat is connected to the lower core-pulling slider by screws.

[0015] As a further improvement of the above technical solution, a first slot that engages with the base is formed on the lower core-pulling slider, and a second slot that engages with the base is formed on the lower sliding seat. The first slot and the second slot are combined to form a mounting groove with the same shape as the base; the bottom surface of the base is provided with a plurality of threaded holes, and the bottom surface of the sliding seat is provided with countersunk holes that are the same number and one-to-one corresponding to the threaded holes, and the screws are connected to the corresponding threaded holes after passing through the countersunk holes.

[0016] As a further improvement of the above technical solution, a hanging ring cavity is formed in the mold cavity, and an upper core pulling mechanism is provided on the movable mold frame. The upper core pulling mechanism includes an upper slide slidably arranged on the movable mold frame, a round hole core pulling rod fixed on the upper slide, and a second core pulling drive mechanism for driving the upper slide and the upper core pulling slider close to or away from the movable mold core; the round hole core pulling rod is inserted from the top of the movable mold core and then extends into the hanging ring cavity, and a spot cooling tube is provided in the round hole core pulling rod.

[0017] As a further improvement of the above technical solution, the round hole core pulling rod includes a core pulling round head, a flow blocking rod body, and a stop tail connected in sequence, a blind hole is opened in the middle of the front end surface of the core pulling round head, and the movable mold core is provided with a second sleeve for guiding the movement of the round hole core pulling rod, and a second pressure block for locking the position of the second sleeve.

[0018] As a further improvement of the above technical solution, the left core-pulling mechanism includes a left slide slidably arranged on the movable mold frame, a left core-pulling slider detachably arranged on the end of the left slide facing the movable mold core, and a third core-pulling drive mechanism for driving the left slide and the left core-pulling slider close to or away from the movable mold core; the left extrusion rod is arranged on the left core-pulling slider, and the left slide is provided with a left locking rod acting on the stop head of the left extrusion rod; the right core-pulling mechanism includes a right slide slidably arranged on the movable mold frame, a right core-pulling slider detachably arranged on the end of the right slide facing the movable mold core, and a fourth core-pulling drive mechanism for driving the right slide and the right core-pulling slider close to or away from the movable mold core; the right extrusion rod is arranged on the right core-pulling slider, and the right slide is provided with a right locking rod acting on the stop head of the right extrusion rod.

[0019] Beneficial effects of the present invention: The die-casting mold for the electronic control side housing of the gearbox provided by the present invention reduces the amount of solid material and applies pressure from both ends of the extra-long channel cavity through the left extrusion rod and the right extrusion rod, and the rear extrusion rod accurately pressurizes the middle solid casting section from the rear side, forming a multi-directional three-dimensional extrusion effect. This structure can specifically compensate for the shrinkage of the 300mm cooling channel entity during the solidification process, especially the middle area where shrinkage cavities are most likely to occur in the traditional process. The pressure of the rear extrusion rod can directly act on the solid casting section where the shrinkage is most concentrated, forcing the molten metal to shrink to this area, greatly improving the density of the entire cooling channel, and completely avoiding the problem of sealing failure or reduced heat dissipation efficiency caused by shrinkage cavities. Therefore, there is no need to deliberately set the left extrusion rod and the right extrusion rod to be extra long to pass through the cooling channel body. A solid casting section is left when the left extrusion rod and the right extrusion rod cover most areas of the extra-long channel cavity. This ensures that the left extrusion rod and the right extrusion rod are reasonably set while having sufficient diameter and structural strength to resist the impact force of the molten metal and avoid bending damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A three-dimensional diagram of the die-casting mold provided by the present invention.

[0021] Figure 2 for Figure 1 A partial enlarged view of area A in the middle.

[0022] Figure 3 for Figure 1 A partial enlarged view of area B in the middle.

[0023] Figure 4 A perspective view of the left extrusion rod and the right extrusion rod.

[0024] Figure 5 Schematic diagram of the connection between the rear extrusion rod and the extrusion drive mechanism.

[0025] Figure 6 Schematic diagram of the structure of the diverter cone.

[0026] Figure 7 This is a three-dimensional diagram of the lower seat and the lower core-pulling slider clamping the diverter cone.

[0027] Figure 8 This is an exploded view of the lower slide seat, lower core-pulling slider and diverter cone.

[0028] Figure 9 Schematic diagram of the bottom structure of the lower slide.

[0029] Figure 10 Schematic diagram of the connection between the round hole core pulling rod and the upper slide.

[0030] Figure 11 It is a three-dimensional diagram of a round hole core pulling rod.

[0031] Figure 12 The three-dimensional casting of the gearbox electronic control side housing Figure 1 .

[0032] Figure 13 The three-dimensional casting of the gearbox electronic control side housing Figure 2 .

[0033] Main component symbols: 1-movable mold core, 11-extra-long channel cavity, 12-solid casting section, 13-lifting ring cavity, 21-left extrusion rod, 22-right extrusion rod, 23-rear extrusion rod, 24-extrusion section, 25-blocking section, 26-connecting section, 27-stop section, 3-extrusion drive mechanism, 31-first oil cylinder, 32-first sleeve, 321-countersunk hole, 322-countersunk part, 33-first pressure block, 4-left core pulling mechanism, 41-left slide, 42-left core pulling slider, 43-third core pulling drive mechanism, 5-right core pulling mechanism, 51-right slide, 52-right core pulling slider, 53-fourth core pulling drive mechanism, 6-upper core pulling mechanism, 61-upper slide, 62-second core pulling drive mechanism, 63-round hole core pulling rod, 63 1-core pulling round head, 632-blocking rod body, 633-stop tail, 634-blind hole, 64-spot cooling tube, 65-second sleeve, 7-lower core pulling mechanism, 71-lower slide seat, 72-lower core pulling slider, 73-first core pulling drive mechanism, 74-diverter cone, 741-truncated cone head, 742-base, 743-threaded hole, 744-concave guide notch, 745-bit slot, 75-mounting slot, 751-first notch, 752-second notch, 76-positioning block, 77-positioning groove, 78-countersunk mounting hole, 9-casting, 91-cooling channel body, 92-discharge nozzle, 93-right extrusion hole, 94-rear extrusion hole, 95-hanging ring body, 96-slag bag thin material, 97-diverter pouring head, 98-protrusion, 10-movable mold frame. DETAILED DESCRIPTION

[0034] The present invention provides a die-casting mold for a gearbox electronic control side housing. To clarify the objectives, technical solutions, and advantages of the present invention, the present invention is further described below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are intended only to illustrate the present invention and are not intended to limit its scope.

[0035] See also Figures 1 to 5 and Figure 12The present invention provides a die-casting mold for a gearbox electronic control side housing, comprising a movable mold frame 10, a fixed mold frame, a movable mold core 1 arranged on the movable mold frame 10, a fixed mold core arranged on the fixed mold frame, a left core-pulling mechanism 4 and a right core-pulling mechanism 5 for core-pulling the side of the gearbox electronic control side housing, and a lower core-pulling mechanism 7 for core-pulling the bottom of the gearbox electronic control side housing; the fixed mold core, the movable mold core 1, the left core-pulling slider 42 of the left core-pulling mechanism 4, the right core-pulling slider 52 of the right core-pulling mechanism 5, and the lower core-pulling slider 72 of the lower core-pulling mechanism 7 are combined to form a mold cavity, a transversely extending extra-long channel cavity 11 is formed in the mold cavity, and a left extrusion rod 21 is inserted into the left end of the extra-long channel cavity 11. A right extrusion rod 22 is extended into the right end, and the left extrusion rod 21 and the right extrusion rod 22 are coaxially arranged and disconnected, so that a solid casting section 12 located between the left extrusion rod 21 and the right extrusion rod 22 is formed in the super-long channel cavity 11. The left extrusion rod 21 is arranged on the left core-pulling mechanism 4, and the right extrusion rod 22 is arranged on the right core-pulling mechanism 5. The movable mold core 1 is provided with at least one rear extrusion rod 23 of the solid casting section 12 extending from the back to the front into the super-long channel cavity 11, and the rear extrusion rod 23 is squeezed toward or away from the solid casting section 12 under the drive of the extrusion drive mechanism 3; a diverter cone 74 is provided on the lower core-pulling mechanism 7, and a gate sleeve cooperating with the diverter cone 74 is provided on the fixed mold core.

[0036] During die casting, the movable mold core 1 and the fixed mold core 1 are closed. The left and right core pulling mechanisms 4 and 5 drive the left and right core pulling sliders toward the center of the mold cavity until their inner ends contact the sides of the movable mold core 1 and the fixed mold core. The lower core pulling mechanism 7 then drives the lower core pulling slider 72 upward, sealing the bottom of the mold cavity. At this point, the movable mold core 1, the fixed mold core, the left core pulling slider 42, the right core pulling slider 52, and the lower core pulling slider 72 are precisely aligned, forming a closed mold cavity that conforms to the outer shape of the gearbox's electronic control housing. The extra-long channel cavity 11 corresponds to the molding area of ​​the cooling channel. The left extrusion rod 21 extends into the left end of the extra-long channel cavity 11 along with the left core-pulling slider 42, while the right extrusion rod 22 extends into the right end of the extra-long channel cavity 11 along with the right core-pulling slider 52. The two remain disconnected, forming a solid casting section 12 approximately 50-80 mm in length in the middle. The rear extrusion rod 23 extends forward under the action of the extrusion drive mechanism 3, with its front end precisely inserted into the preset position of the solid casting section 12 (the rear end remains connected to the movable mold core 1 to ensure stability). The top of the diverter cone 74 on the lower core-pulling mechanism 7 tightly fits with the lower end of the gate sleeve on the fixed mold core to form the main channel for molten metal injection. The diversion structure of the diverter cone 74 can evenly guide the molten metal to various areas of the cavity to avoid excessive local impact.

[0037] The molten metal enters through the gate sleeve and is diverted by the diverter cone 74 before quickly filling the mold cavity. The filling speed can reach 5-10 m / s. During the filling process, the molten metal in the extra-long channel cavity 11 contacts the surfaces of the left extrusion rod 21, the right extrusion rod 22, and the rear extrusion rod 23 at the same time. The left extrusion rod 21 and the right extrusion rod 22 apply an initial pressure (about 5-10 MPa) to the molten metal at both ends of the extra-long channel cavity 11 along with the clamping force of the left core-pulling slider 42 and the right core-pulling slider 52, reducing the amount of material in the traditional solid body and avoiding uneven cooling caused by excessive total amount of molten metal. Under the action of the extrusion drive mechanism 3, the rear extrusion rod 23 applies additional pressure (about 8-15 MPa) to the molten metal in the middle solid casting section 12. The direction of this pressure is perpendicular to the pressure direction of the left extrusion rod 21 and the right extrusion rod 22 (or at a preset angle), forming a three-dimensional coordinated extrusion, forcing the molten metal to flow to the dead corner of the cavity and eliminating potential shrinkage space.

[0038] When the mold is opened, the movable mold frame 10 drives the movable mold core 1 to move backward, and the casting 9 is separated from the fixed mold core along with the movable mold core 1. The left core pulling mechanism 4 and the right core pulling mechanism 5 drive the left core pulling slider 42 and the right core pulling slider 52 to be pulled out synchronously to both sides. During the withdrawal process, the left extrusion rod 21 and the right extrusion rod 22 exit the extra-long channel cavity 11 along with the left core pulling slider and the right core pulling slider; the lower core pulling mechanism 7 drives the lower core pulling slider 72 to move downward and separate from the bottom of the casting 9, and finally the casting 9 is ejected from the movable mold core 1 by the ejection mechanism, and the casting 9 is taken out by the robot.

[0039] The die-casting mold for the electronic control side housing of the gearbox provided by the present invention reduces the amount of solid material and applies pressure from both ends of the extra-long channel cavity 11 through the left extrusion rod 21 and the right extrusion rod 22. The rear extrusion rod 23 accurately pressurizes the middle solid casting section 12 from the rear side to form a multi-directional three-dimensional extrusion effect. This structure can specifically compensate for the shrinkage of the 300mm cooling channel entity during the solidification process, especially the middle area where shrinkage cavities are most likely to occur in traditional processes. The pressure of the rear extrusion rod 23 can directly act on the solid casting section 12 where the shrinkage is most concentrated, forcing the molten metal to shrink to this area, thereby greatly improving the density of the entire cooling channel and completely avoiding the problems of sealing failure or reduced heat dissipation efficiency caused by shrinkage cavities. Therefore, there is no need to deliberately set the left extrusion rod 21 and the right extrusion rod 22 to be extra long to pass through the cooling channel body 91. A solid casting section 12 is left when the left extrusion rod 21 and the right extrusion rod 22 cover most of the area of ​​the extra-long channel cavity 11. In this way, the left extrusion rod 21 and the right extrusion rod 22 are reasonably set while ensuring that they have sufficient diameter and structural strength to resist the impact force of the molten metal and avoid bending damage.

[0040] A detailed analysis of the extrusion angles and directions is as follows: 1. The left and right extrusion rods 21 and 22 apply pressure to the extra-long channel cavity 11 from both ends, effectively reducing the amount of molten metal filling the cavity's two end regions and lowering the probability of shrinkage cavities caused by uneven shrinkage during solidification. Simultaneously, the lateral extrusion pressure forces the molten metal at both ends to flow toward the central solid casting section 12, replenishing the central region and reducing shrinkage cavities caused by insufficient molten metal. 2. The rear extrusion rods 23 apply pressure to the solid casting section 12 longitudinally, directly targeting the central region, which is most susceptible to shrinkage cavities in conventional structures. This longitudinal pressure forces the molten metal in the solid casting section 12 to more densely fill the cavity, eliminating internal voids and significantly reducing shrinkage cavities in the central region. 3. The three-directional extrusion creates a synergistic effect, creating a comprehensive pressure field. The lateral left and right extrusions, combined with the longitudinal rear extrusion, ensure that the molten metal within the extra-long channel cavity 11 is subjected to pressure from all directions, avoiding the pressure blind spots that can occur when extruding in a single direction. This all-round pressure can ensure that the molten metal is fully compensated during the solidification process, effectively reducing shrinkage holes at both ends and in the middle of the cavity, and greatly improving the molding quality and sealing of the cooling channel.

[0041] See Figure 4 As shown, the left extrusion rod 21 and the right extrusion rod 22 each include an extrusion section 24, a flow blocking section 25, a connecting section 26 and a stop section 27 connected in sequence. The extrusion section 24 directly acts on the molding area of ​​the casting 9, and ensures the density and dimensional accuracy of specific parts of the casting 9 through precise pressure control. The flow blocking section 25 effectively prevents the molten metal from flowing back during the extrusion process, ensures the stability of the filling process, and avoids defects such as cold shut and air holes caused by the backflow of the molten metal. The connecting section 26 realizes a reliable connection with the driving mechanism, ensures the effective transmission of the driving force, and is easy to disassemble and maintain, thereby reducing the equipment maintenance cost. The stop section 27 not only limits the circumferential rotation of the extrusion rod, but also performs axial positioning of the extrusion rod.

[0042] The length of the extra-long channel cavity 11 is greater than 300mm, and the extrusion sections 24 of the left extrusion rod 21 and the right extrusion rod 22 both have a draft taper and the diameter of the free end of the extrusion section 24 is greater than 5mm. During the extrusion process, the left extrusion rod 21 and the right extrusion rod 22 need to withstand the reaction force from the molten metal, especially when they penetrate deep into the extra-long channel cavity 11, which can easily generate bending moments due to uneven force. If the diameter is further reduced, the moment of inertia of the section will drop significantly, and the bending resistance will be sharply weakened, which may cause deformation, fracture and other failures of the extrusion section 24. However, the current diameter retains sufficient material thickness, and the gradient structure formed by the draft taper can disperse the stress to the entire extrusion section 24, ensuring that the structure remains stable during high-frequency and high-intensity extrusion operations, and avoiding the influence of the extrusion accuracy due to the bending of the rod body.

[0043] It is understandable that the limitation of the free end diameter determines the rigidity basis of the extrusion section 24, and different length settings can form a reasonable match with this rigidity basis. For the right extrusion rod 22, the 52mm length and the free end diameter can ensure that it penetrates deep into the extra-long channel cavity 11 while avoiding the lack of overall rigidity of the rod body due to excessive length. If the length is too long under the same diameter limitation, it may increase the deflection of the rod body and affect the extrusion accuracy; while the 52mm length can maintain good rigidity together with the free end diameter while meeting the operating depth requirements. Although the left extrusion rod 21 is relatively long at 135mm, the structural proportion formed by the free end diameter can adapt to the extrusion requirements of deeper parts of the casting 9. At the same time, with the help of the draft taper design, the force on the rod body is dispersed, compensating for the rigidity loss that may be caused by the long rod, ensuring stable operation under longer strokes.

[0044] To reduce the root cause of shrinkage cavities, the length of solid casting section 12 is kept within 80mm due to its equal spacing with the extrusion rods, preventing it from being excessively long. During the casting process, the longer the solid section of casting 9, the greater the probability of shrinkage cavities forming during solidification due to uneven heat dissipation and untimely shrinkage compensation. A shorter solid casting section 12 allows for a more synchronized solidification process of the molten metal from the outside in, shortening the solidification time difference and reducing the space and opportunity for shrinkage cavities to form due to prolonged solidification shrinkage. This reduces the likelihood of shrinkage cavities from the source and lays a good foundation for the quality of casting 9.

[0045] Specifically, the extrusion drive mechanism 3 includes a first oil cylinder 31 provided on the back plate of the movable mold frame 10, a first sleeve 32 provided on the movable mold core 1 for guiding the movement of the rear extrusion rod 23, and a first pressure block 33 for locking the position of the first sleeve 32. The piston rod end of the first oil cylinder 31 is drivingly connected to the tail end of the rear extrusion rod 23. The first oil cylinder 31 is directly drivingly connected to the tail end of the rear extrusion rod 23. This direct drive method reduces the energy loss of the intermediate transmission link and can quickly and accurately transmit the driving force, ensuring that the rear extrusion rod 23 responds quickly during operation and improving the working efficiency of the entire mechanism. At the same time, direct drive avoids the problems of looseness and lag that may occur in indirect transmission, making the movement of the rear extrusion rod 23 more stable and reliable, and ensuring the accuracy of the extrusion operation. The first sleeve 32 provides a stable motion trajectory for the rear extrusion rod 23, effectively preventing it from deflecting or shaking during movement, further ensuring the accuracy of the extrusion action. The locking of the first sleeve 32 by the first pressure block 33 ensures that the first sleeve 32 is fixed in its own position during the guiding process, thereby avoiding the movement accuracy of the rear extrusion rod 23 affected by the displacement of the first sleeve 32, thereby improving the working stability of the entire mechanism.

[0046] See Figure 5As shown, the interior of the first sleeve 32 is a countersunk hole 321 structure, and the countersunk portion 322 of the countersunk hole 321 is located at the end close to the solid casting section 12. The countersunk hole 321 structure inside the first sleeve 32 directly participates in the molding of the casting 9, and its countersunk portion 322 forms the outer contour of the discharge nozzle 92 at the end close to the solid casting section 12. The rear extrusion hole 94 left by the rear extrusion rod 23 in the solid casting section 12 and the discharge nozzle 92 also facilitates subsequent drilling to form a discharge outlet connected to the cooling channel. The first sleeve 32 serves as both a guide for the rear extrusion rod 23 and as a molding for the discharge nozzle 92; the rear extrusion rod 23 not only realizes the pressurization and shrinkage compensation of the solid casting section 12, but also reserves a positioning hole for subsequent processing. This ingenious integrated design, with one component serving two purposes, reduces the complexity and cost of mold manufacturing.

[0047] See Figure 1 、 Figures 6 to 9 When the cam 72 is in the closed position, the locking cam 73 is in the closed position, and the locking cam 73 is in the closed position, so that the cam 73 can move freely, thereby locking the cam 73 in the closed position.

[0048] When the fixed mold core and the movable mold core are separated at the initial stage of actual mold opening, the diverter nozzle 97 of the casting 9 is easily moved along with the fixed mold core due to factors such as the adhesion force caused by the cooling and shrinkage of the molten metal or the mold fitting clearance. Since the diverter cone 74 is still in contact with the casting 9 through the lower core-pulling slider 72 at this time, the unexpected movement of the diverter nozzle 97 of the casting 9 will cause a pulling force between it and the diverter cone 74, thereby causing the casting 9 to break, crack or surface damage, seriously affecting product quality and production efficiency. For this reason, the concave guide notch 744 is provided with a retaining groove 745 on the end face facing the movable mold core 1. When the molten metal is cooled and formed, the diverter nozzle 97 of the casting 9 will be embedded in the retaining groove 745 on the end face of the truncated cone head 741 to form a mechanically limited protrusion 98. During the mold opening phase, when the fixed and movable cores are initially separated, the casting 9 is restrained on the movable mold side by the protrusion 98 on the diverter nozzle 97 of the casting 9, which effectively engages with the diverter cone 74 through the retaining groove 745. This effectively locks the casting 9 with the movable mold, preventing it from moving with the fixed mold. Once the fixed core is completely free of the casting 9, the first core-pulling drive mechanism 73 reverses the drive seat 71, driving the lower core-pulling slider 72 and diverter cone 74 away from the movable core 1. The retaining groove 745 disengages the protrusion 98 on the diverter nozzle 97, allowing the casting 9 remaining on the movable core 1 to be removed smoothly by the robot arm.

[0049] During the molding process of the casting 9, a mechanical limit is formed with the diverter nozzle 97, which effectively limits the tendency of the diverter nozzle 97 to move with the fixed mold in the initial stage of mold opening, fundamentally avoiding the breaking, cracking or surface damage of the casting 9 caused by pulling, and significantly improving the yield of the casting 9.

[0050] In addition, the diverter cone 74 is clamped between the lower core-pulling slider 72 and the lower sliding seat 71. Combined with the driving action of the first core-pulling drive mechanism 73, the relative position of the diverter cone 74 and the movable mold core 1 can be flexibly adjusted to perfectly adapt to the complex mold structure with compact space around the movable mold core 1. The installation requirements can be met without changing the traditional layout of the movable mold core 1.

[0051] In this embodiment, the retaining groove 745 is a rectangular groove structure with chamfered edges. From the perspective of positional stability, the rectangular groove structure can form a rectangular protrusion 98 on the diverter nozzle 97 of the casting 9, providing more comprehensive circumferential positional retention, further enhancing the retaining effect of the diverter nozzle 97, reducing the shaking of the diverter nozzle 97 relative to the retaining groove 745 during mold opening, making the positional retention more reliable, and reducing the risk of damage to the casting 9 due to localized uneven force.

[0052] The chamfered transition design of the edge, on the one hand, can guide the molten metal to flow more smoothly into the positioning groove 745 during the molten metal filling process, avoiding the stagnation or eddy current of the molten metal flow caused by the right-angle edge, and ensuring the molding quality of the diverter nozzle 97; on the other hand, when the core-pulling slider drives the diverter cone 74 to separate from the casting 9 during mold opening, the chamfer can reduce the friction and scratching between the positioning groove 745 and the diverter nozzle 97, reduce the demoulding resistance, and protect the integrity of the diverter nozzle 97 part of the casting 9. At the same time, it can also reduce the wear on the edge of the positioning groove 745 and extend the service life of the diverter cone 74.

[0053] As a preferred embodiment, the base 742 of the diverter cone 74 has a major arc cross-section. In addition to increasing the contact area, another key function is to limit its own circumferential rotation through its asymmetric shape. Because the major arc shape is not a circular or other symmetrical structure, when clamped between the lower core-pulling slider 72 and the lower lower seat 71, its curved edge forms a circumferential limit with the mating surfaces of the lower core-pulling slider 72 and the lower lower seat 71, effectively preventing the diverter cone 74 from circumferential deflection due to the impact of molten metal and the lateral force of the core-pulling operation.

[0054] Preferably, see Figure 8 As shown, the lower seat 71 is provided with a positioning block 76 on the end surface facing the lower core-pulling slider 72. The lower core-pulling slider 72 is provided with a positioning groove 77 that matches the positioning block 76. The lower seat 71 and the lower core-pulling slider 72 are connected by screws. The positioning block 76 on the lower seat 71 matches the positioning groove 77 on the lower core-pulling slider 72, allowing for quick positioning during assembly. This ensures the accurate relative position of the lower core-pulling slider 72 and the lower seat 71, preventing assembly deviations from affecting the fit accuracy of the diverter cone 74, the movable mold core 1, and the sprue bushing. It also provides a pre-fixing function for subsequent screw connections, facilitating assembly operations. The screw connection between the lower seat 71 and the lower core-pulling slider 72 is not only reliable and can withstand the driving force and impact forces during the core-pulling process, but also facilitates disassembly and maintenance. If the lower core-pulling slider 72 or the lower seat 71 becomes worn, they can be easily replaced, reducing mold maintenance costs.

[0055] In fact, see Figure 8As shown, the lower core-pulling slider 72 forms a first notch 751 that engages with the base 742, and the lower sliding seat 71 forms a second notch 752 that engages with the base 742. The first notch 751 and the second notch 752 combine to form a mounting slot 75 with the same shape as the base 742. On the one hand, because the mounting slot 75 is fully compatible with the superior arc structure of the base 742, it can form a fully wrapped engagement with the base 742 of the diverter cone 74, further strengthening the circumferential restraint of the diverter cone 74. This tightly fitted structure avoids any gap between the base 742 and the mounting slot 75, effectively resisting circumferential torque caused by molten metal impact and lateral core-pulling forces, completely preventing circumferential rotation of the diverter cone 74 during operation, ensuring that the preset orientations of the concave guide notch 744 and the retaining slot 745 are always accurate, ensuring stable molten metal diversion and reliable retention of the diverter nozzle 97 by the retaining slot 745.

[0056] For further information, see Figure 9 As shown, the bottom surface of the base 742 is provided with a plurality of threaded holes 743, and the bottom surface of the lower sliding seat 71 is provided with countersunk mounting holes 78 of the same number and corresponding one to one with the threaded holes 743. Screws pass through the countersunk mounting holes 78 and connect with the corresponding threaded holes 743. In terms of connection strength, the multiple evenly distributed threaded holes 743 and the countersunk mounting holes 78 are connected by screws, which can firmly lock the base 742 of the diverter cone 74 on the lower sliding seat 71. The interlocking structure of the mounting groove 75 formed by the first notch 751 and the second notch 752 forms a double fixing mode. This double fixing can significantly improve the ability of the diverter cone 74 to resist the high-pressure impact of the molten metal and the lateral force during the core pulling process, prevent the diverter cone 74 from loosening or displacement during long-term high-frequency operation, and ensure the long-term stability of its matching accuracy with the gate sleeve.

[0057] The design of the countersunk mounting hole 78 enables the screw head to be completely embedded in the bottom surface of the lower slide 71, preventing the screw head from protruding from the bottom surface of the lower slide 71 and affecting the smooth sliding of the slide on the movable mold frame 10. At the same time, it prevents the screw from interfering with other parts of the mold, ensuring the flexibility and stability of the first core-pulling drive mechanism 73 when driving the lower slide 71 to move, and reducing movement jams or component wear due to structural interference.

[0058] See Figure 13As shown, in order to meet the hoisting requirements of the gearbox electronic control side housing in the links of production, transportation, assembly, etc., it is necessary to set a lifting ring body 95 on the gearbox electronic control side housing in an integrated manner. The lifting ring body 95 needs to withstand a large pulling force during use, which requires it to have high structural strength and reliability. Once the lifting ring body 95 has quality problems, it may cause a safety accident during the hoisting process. If the lifting ring cavity 13 is formed by the movable mold core 1 and the fixed mold core, a lifting ring body 95 solid body is directly cast, and then the lifting ring body 95 hole is processed on the lifting ring body 95 solid body by machining. However, this process has obvious disadvantages. Because the overall material amount of the lifting ring body 95 solid body is large, during the die-casting process, when the molten metal solidifies, due to the slow heat dissipation inside the solid body and the relatively fast cooling outside, it is easy to cause insufficient internal molten metal replenishment, and then form shrinkage holes inside the lifting ring body 95 solid body. These shrinkage holes will seriously affect the structural strength of the hanging ring body 95, making the hanging ring body 95 prone to breakage when bearing loads, greatly reducing the reliability of the hanging ring body 95.

[0059] In this embodiment, see Figure 1 and Figure 2 As shown, a hanging ring cavity 13 is formed in the mold cavity, and an upper core pulling mechanism 6 is provided on the movable mold frame 10. The upper core pulling mechanism 6 includes an upper slide 61 slidably set on the movable mold frame 10, a round hole core pulling rod 63 fixed on the upper slide 61, and a second core pulling drive mechanism 62 for driving the upper slide 61 and the upper core pulling slider to approach or move away from the movable mold core 1; the round hole core pulling rod 63 is inserted from the top of the movable mold core 1 and then extends into the hanging ring cavity 13, and a spot cooling tube 64 is provided in the round hole core pulling rod 63.

[0060] During the die-casting operation of the ring body 95, the movable mold core 1 and the fixed mold core are closed to form the ring cavity 13. The second core-pulling assembly drives the upper slide 61, which then drives the circular core-pulling rod 63, which is inserted from the top of the movable mold core 1 and extends into the ring cavity 13. During die-casting, molten metal is injected into the ring cavity 13. The circular core-pulling rod 63 serves as the foundation for forming the ring hole (reserving the hole space) and also squeezes the molten aluminum in the ring cavity 13 during the molten metal filling process. Simultaneously, the spot cooling tube 64 inside the circular core-pulling rod 63 is fed with cooling medium, accelerating the solidification of the surrounding molten metal.

[0061] After die casting is completed, the second core pulling assembly drives the round hole core pulling rod 63 to be pulled out from the cavity. Figure 13 As shown, although a small amount of slag ladle thin material 96 remains at the position of the eyelet hole, the eyelet hole can be formed by simply machining the thin material portion.

[0062] The die-casting mold provided by the present invention improves the die-casting method of the hanging ring body 95. By extending the circular hole core pulling rod 63 into the hanging ring cavity 13, the amount of molten metal used in the hanging ring body 95 is reduced, and the material pressure during the overall solidification is reduced. At the same time, the circular hole core pulling rod 63 squeezes the aluminum liquid in the hanging ring cavity 13, which can promote the molten metal to fully fill the cavity gap, reduce shrinkage defects caused by insufficient internal shrinkage, and significantly improve the structural strength of the hanging ring body 95. At the same time, the spot cooling tube 64 in the circular hole core pulling rod 63 can perform targeted cooling on the molten metal inside the cavity, accelerate the solidification rate of the internal molten metal, reduce the difference in internal and external cooling, avoid shrinkage defects caused by insufficient internal molten metal replenishment, significantly improve the structural strength and reliability of the hanging ring body 95, and reduce safety hazards during the lifting process.

[0063] In this embodiment, see Figure 11 As shown, the round hole core pulling rod 63 includes a core pulling round head 631, a flow blocking rod body 632, and a stop tail 633 connected in sequence. A blind hole 634 is provided in the middle of the front end surface of the core pulling round head 631. During the die-casting process, a small slag bag will be formed at the corresponding position of the casting of the hanging ring body 95. This design can guide the shrinkage direction of the molten metal during solidification, so that possible defects such as shrinkage cavities are concentrated in the small slag bag area, avoiding the appearance of shrinkage cavities in the main stress-bearing part of the hanging ring body 95. At the same time, the small slag bag serves as a shrinkage feeding area during the solidification process of the molten metal, which can reduce the shrinkage cavity problem caused by insufficient molten metal replenishment in the main structure of the hanging ring body 95, and significantly improve the structural integrity and reliability of the hanging ring body 95.

[0064] The presence of the slag pockets allows the areas requiring machining on the eyelet body 95 to be more focused and clearly defined. During subsequent eyelet hole machining, the small slag pockets can be removed and the eyelet hole formed in a single operation, eliminating the need for additional processing of scattered defective areas. This simplifies machining steps, reduces cleaning effort, and improves production efficiency.

[0065] For further information, see Figure 10 As shown, the movable mold core 1 is provided with a second sleeve 65 for guiding the movement of the round hole core pulling rod 63, and a second pressure block for locking the position of the second sleeve 65. The second sleeve 65 on the movable mold core 1 can provide precise guidance for the movement of the round hole core pulling rod 63, ensuring that it moves smoothly along the preset trajectory during the insertion and extraction of the ring cavity 13, avoiding the deviation of the reserved position of the ring hole due to the offset of the round hole core pulling rod 63, and ensuring the molding accuracy of the ring hole. At the same time, the second pressure block locks the position of the second sleeve 65, which can prevent the second sleeve 65 from being displaced or loosened under the high-pressure environment of die casting, further strengthening the guiding stability of the round hole core pulling rod 63, and reducing the problem of uneven metal liquid filling caused by the shaking of the round hole core pulling rod 63.

[0066] See Figure 1As shown, the left core-pulling mechanism 4 includes a left slide 41 slidably mounted on the movable mold frame 10, a left core-pulling slider 42 detachably mounted on the end of the left slide 41 facing the movable mold core 1, and a third core-pulling drive mechanism 43 for driving the left slide 41 and the left core-pulling slider 42 toward or away from the movable mold core 1. The left extrusion rod 21 is mounted on the left core-pulling slider 42, and the left slide 41 is provided with a left locking rod that acts on the stopper of the left extrusion rod 21. During the molding stage of the casting 9, the left core-pulling slider 42 drives the left extrusion rod 21 to the designated position, and the left extrusion rod 21 completes the extrusion and shrinkage compensation of the casting 9. During the core-pulling stage, the left core-pulling slider 42 can withdraw the left extrusion rod 21 along with the left slide 41, preventing interference between the left extrusion rod 21 and the casting 9 and ensuring a smooth core-pulling process. This synchronized design reduces the coordination errors between different mechanisms and improves the consistency and efficiency of the entire molding process. In addition, the left locking rod on the left slide 41 acts on the stop head of the left extrusion rod 21, which can lock the position of the left extrusion rod 21 during the extrusion operation to prevent it from being displaced under the action of pressure, thereby ensuring the stable transmission of the extrusion pressure and the shrinkage compensation effect; and when pulling the core, the left locking rod can be unlocked without affecting the movement of the left extrusion rod 21 with the left core-pulling slider 42, thereby realizing flexible switching between the extrusion and core-pulling states and further ensuring the reliability of the operation.

[0067] Specifically, the right core-pulling mechanism 5 includes a right slide 51 slidably mounted on the movable mold frame 10, a right core-pulling slider 52 detachably mounted on the end of the right slide 51 facing the movable mold core 1, and a fourth core-pulling driving mechanism 53 for driving the right slide 51 and the right core-pulling slider 52 toward or away from the movable mold core 1; the right extrusion rod 22 is mounted on the right core-pulling slider 52, and the right slide 51 is provided with a right locking rod that acts on the stop head of the right extrusion rod 22. During the molding stage of the casting 9, the right core-pulling slider 52 drives the right extrusion rod 22 to accurately reach the designated position, and the right locking rod on the right slide 51 locks the stop head of the right extrusion rod 22, thereby effectively fixing the position of the right extrusion rod 22 and preventing it from being displaced under the action of the extrusion pressure, thereby ensuring that the extrusion pressure is stably transmitted to the target area of ​​the casting 9, thereby enhancing the shrinkage compensation effect and reducing the occurrence of defects such as shrinkage cavities and shrinkage porosity. During the core pulling stage, the right locking rod releases the lock on the stop head, and the right extrusion rod 22 is evacuated synchronously with the right core pulling slider 52, avoiding interference with the casting 9 and ensuring the smoothness of the core pulling process.

[0068] The first, second, third, and fourth core-pulling drive mechanisms 73, 62, 43, and 53 all comprise a U-shaped frame fixed to the side of the movable mold frame 10 and a hydraulic cylinder mounted on the U-shaped frame. The ends of the piston rods of the hydraulic cylinders are connected to the corresponding slides via joints. Using the hydraulic cylinders as a power source, the output force is stable and controllable, providing continuous and uniform driving force to the slides. This ensures smooth movement of the core-pulling sliders as they approach or move away from the movable mold core 1, preventing problems such as stuck or offsetting the core-pulling action due to power fluctuations.

[0069] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0071] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all such changes or substitutions should fall within the scope of protection of the present invention.

Claims

1. The die-casting mold of the gearbox electronic control side housing is characterized by: The present invention comprises a movable mold frame, a fixed mold frame, a movable mold core arranged on the movable mold frame, a fixed mold core arranged on the fixed mold frame, a left core pulling mechanism and a right core pulling mechanism for core pulling the side of the gear box electronic control side housing, and a lower core pulling mechanism for core pulling the bottom of the gear box electronic control side housing; the fixed mold core, the movable mold core, the left core pulling slider of the left core pulling mechanism, the right core pulling slider of the right core pulling mechanism, and the lower core pulling slider of the lower core pulling mechanism are combined to form a mold cavity, and a transversely extending super-long channel cavity is formed in the mold cavity, and a left extrusion rod is inserted into the left end of the super-long channel cavity and a right extrusion rod is inserted into the right end. A right extrusion rod, the left extrusion rod and the right extrusion rod are coaxially arranged and disconnected, so that a solid casting section located between the left extrusion rod and the right extrusion rod is formed in the super-long channel cavity, the left extrusion rod is arranged on the left core-pulling mechanism, and the right extrusion rod is arranged on the right core-pulling mechanism. The movable mold core is provided with at least one rear extrusion rod of the solid casting section extending from the back to the front into the super-long channel cavity, and the rear extrusion rod is driven by the extrusion drive mechanism to squeeze toward or away from the solid casting section; the lower core-pulling mechanism is provided with a diverter cone, and the fixed mold core is provided with a gate sleeve that cooperates with the diverter cone.

2. The die-casting mold for the gearbox electronic control side housing according to claim 1, characterized in that: The length of the super-long channel cavity is greater than 300 mm, the extrusion sections of the left extrusion rod and the right extrusion rod both have a draft taper and the diameter of the free end of the extrusion section is greater than 5 mm, and the distance between the left extrusion rod and the right extrusion rod is less than 80 mm.

3. The die-casting mold for the gearbox electronic control side housing according to claim 1, characterized in that: The extrusion drive mechanism includes a first oil cylinder arranged on the back plate of the movable mold frame, a first sleeve arranged on the movable mold core for guiding the movement of the rear extrusion rod, and a first pressure block for locking the position of the first sleeve. The piston rod end of the first oil cylinder is drivingly connected to the tail end of the rear extrusion rod.

4. The die-casting mold for the gearbox electronic control side housing according to claim 3, characterized in that: The interior of the first sleeve is a countersunk hole structure, and the countersunk portion of the countersunk hole is located at the end close to the solid casting section.

5. The die-casting mold for the gearbox electronic control side housing according to claim 1, characterized in that: The lower core-pulling mechanism includes a lower seat slidably arranged on the movable mold frame, a lower core-pulling slider detachably arranged on the end of the lower seat facing the movable mold core, and a first core-pulling driving mechanism for driving the lower seat and the lower core-pulling slider to approach or move away from the movable mold core. The diverter cone is clamped between the lower core-pulling slider and the lower seat. The diverter cone includes a base and a truncated cone head integrally formed with the base. The truncated cone head is provided with a concave guide notch, and the concave guide notch is provided with a positioning groove on the end surface facing the movable mold core.

6. The die-casting mold for the gearbox electronic control side housing according to claim 5, characterized in that: The cross section of the base of the diverter cone is an arc shape, a positioning block is provided on the end surface of the lower slide seat facing the lower core-pulling slider, a positioning groove adapted to the positioning block is provided on the lower core-pulling slider, and the lower slide seat is connected to the lower core-pulling slider by screws.

7. The die-casting mold for the gearbox electronic control side housing according to claim 6, characterized in that: A first notch is formed on the lower core-pulling slider and is engaged with the base, and a second notch is formed on the lower seat and is engaged with the base. The first notch and the second notch are combined to form a mounting groove with the same shape as the base; the bottom surface of the base is provided with a plurality of threaded holes, and the bottom surface of the slide is provided with countersunk mounting holes with the same number and one-to-one correspondence as the threaded holes, and the screws pass through the countersunk mounting holes and are connected with the corresponding threaded holes.

8. The die-casting mold for the gearbox electronic control side housing according to claim 1, characterized in that: A hanging ring cavity is formed in the mold cavity, and an upper core pulling mechanism is provided on the movable mold frame. The upper core pulling mechanism includes an upper slide slidably arranged on the movable mold frame, a round hole core pulling rod fixed on the upper slide, and a second core pulling drive mechanism for driving the upper slide and the upper core pulling slider to approach or move away from the movable mold core; the round hole core pulling rod is inserted from the top of the movable mold core and then extends into the hanging ring cavity, and a spot cooling tube is provided in the round hole core pulling rod.

9. The die-casting mold for the gearbox electronic control side housing according to claim 8, characterized in that: The round hole core pulling rod includes a core pulling round head, a flow blocking rod body, and a stop tail connected in sequence. A blind hole is opened in the middle of the front end surface of the core pulling round head. The movable mold core is provided with a second sleeve for guiding the movement of the round hole core pulling rod, and a second pressure block for locking the position of the second sleeve.

10. The die-casting mold for the electronic control side housing of the gearbox according to claim 1, characterized in that: The left core-pulling mechanism includes a left slide slidably arranged on the movable mold frame, a left core-pulling slider detachably arranged on the end of the left slide facing the movable mold core, and a third core-pulling driving mechanism for driving the left slide and the left core-pulling slider close to or away from the movable mold core; the left extrusion rod is arranged on the left core-pulling slider, and the left slide is provided with a left locking rod that acts on the stop head of the left extrusion rod; the right core-pulling mechanism includes a right slide slidably arranged on the movable mold frame, a right core-pulling slider detachably arranged on the end of the right slide facing the movable mold core, and a fourth core-pulling driving mechanism for driving the right slide and the right core-pulling slider close to or away from the movable mold core; the right extrusion rod is arranged on the right core-pulling slider, and the right slide is provided with a right locking rod that acts on the stop head of the right extrusion rod.

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