A three core pulling mold

Abstract

This invention proposes a three-core-pulling mold, comprising an upper mold and a lower mold. The lower mold has two sets of symmetrical lower cavities, each consisting of a straight cavity 1, a cavity 2, and an arc-shaped cavity 3. A movable slider 1 is located on the front of the lower mold, fixedly connected to a core 1 corresponding to cavity 1. Rotatable rotating arms, coaxial with the axis of cavity 3, are located on both sides of the lower mold. Sliding sliders 2 are located on both sides of the lower mold, fixedly connected to core 2 and abutting against core 3. Sliding sliders 2 and the rotating arms slide in a sliding fit. Sliding sliders 2 and core 2 have through holes, and a shorter anti-pull tube is slidably sleeved on a connecting rod, slidingly connected to the through holes. During demolding, the upper mold moves upward, and the inclined ejector rod drives slider 2 to complete the straight core-pulling of core 2; subsequently, slider 1 moves forward to complete the straight core-pulling, while simultaneously rotating the rotating arms via a linkage to achieve the rotational core-pulling of core 3. The sliding fit between slider 2 and the connecting rod avoids core-pulling interference, and the anti-pull tube prevents deformation of the slender connecting rod.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and specifically to a three-core-pulling mold. Background Technology

[0002] refer to Figure 1 The diagram shows a 90-degree bend pipe joint structure, comprising a central bend and straight pipe sections connecting the two ends of the bend. The two straight pipe sections are perpendicular to each other. One straight pipe section consists of three sections with gradually increasing diameters, and the other straight pipe section has external threads on its outer wall. This is for a product requiring injection molding.

[0003] After the above products are molded using injection molds, they need to be removed by core pulling and demolding.

[0004] For straight pipe sections, the most common core-pulling method in existing technologies is linear core-pulling.

[0005] For the bent pipe section, the common core-pulling method in the existing technology is rotary core-pulling.

[0006] For example, the engine water inlet pipe mold structure disclosed in the prior art patent application number CN201920980402.0 involves the aforementioned rotary core pulling and linear core pulling.

[0007] However, its linear core pulling and rotary core pulling are located at opposite ends of the molded product, and will not interfere with each other. As for this application… Figure 1 The product in question requires straight core pulling at both ends and rotary core pulling at the middle bend. This causes the rotary core pulling to interfere with one of the straight core pulling processes. Summary of the Invention

[0008] In view of the problems pointed out in the background art, the present invention proposes a three-core-pulling mold to solve the above-mentioned technical problems.

[0009] The technical solution of this invention is implemented as follows: A three-core-pulling mold includes an upper mold and a lower mold. The upper side of the lower mold has two symmetrical lower cavities, and the lower side of the upper mold has an upper cavity corresponding to the lower cavities. The lower cavities include a cavity one arranged in the front-back direction and a cavity two arranged in the left-right direction, and also include a cavity three connecting the cavity one and the cavity two. The cavity three is arc-shaped. The front side of the lower mold is provided with a slider that can only move back and forth, and the rear side of the slider is provided with two cores that correspond to the two cavities respectively. The lower mold has rotatable rotating arms on its left and right sides respectively. The rotation axis of the rotating arms is coaxial with the central axis of the cavity three. The cavity three has an arc-shaped core three. One end of the core three abuts against the core one, and the other end of the core three is fixedly connected to the rotating arm through a connecting rod. The connecting rod is set in the left and right direction. The lower mold has two sliders on its left and right sides that can only slide left and right. The end face of the slider two near the lower cavity has a core two. The other end of the core two abuts against the core three. The slider two slides in cooperation with the rotating arm. It also includes a through hole that runs through the core 2 and the slider 2 in the left-right direction, and an anti-pull tube is slidably sleeved on the connecting rod. The length of the anti-pull tube is less than the length of the connecting rod, and the anti-pull tube is slidably connected to the through hole.

[0010] The invention is further configured such that the upper side of the slider two is provided with an oblique insertion hole, and the lower side of the upper mold is provided with an oblique push rod that is inserted into the oblique insertion hole.

[0011] The present invention is further configured such that a linkage bar is provided on the left and right sides of the slider one, one end of the linkage bar is hinged to the slider one, and the other end of the linkage bar is hinged to the corresponding rotating arm. The slider one can rotate back and forth by driving the rotating arm to rotate through the linkage bar.

[0012] The present invention is further configured such that a guide rail is provided on the front side of the lower mold along the front-back direction, the slider 1 is slidably engaged with the guide rail, and a driving device for driving the slider 1 to move back and forth is provided on the guide rail.

[0013] The present invention is further configured such that slider one and slider two are respectively provided with upwardly protruding positioning blocks, and the lower side of the upper mold is provided with positioning grooves corresponding to and connected to the positioning blocks.

[0014] The present invention is further configured such that a groove structure is formed on the lower mold to accommodate slider one, rotating arm and slider two.

[0015] The present invention is further configured such that replaceable templates are provided on the lower side of the upper mold and the upper side of the lower mold, and the upper cavity and the lower cavity are respectively provided on the templates.

[0016] The present invention is further configured such that the connecting rod is a slender rod-shaped structure.

[0017] The invention is further configured to include a cooling channel 1 that penetrates the second core, the connecting rod, and the rotating arm, a cooling channel 2 that penetrates the first core and the first slider, and the cooling channels 1 and 2 that are interconnected at the abutting positions of the first core and the third core.

[0018] The invention is further configured such that a slide rail is provided on the rotating arm along the left and right direction, the slide rail has a T-shaped cross section, and a corresponding slide groove is provided on the lower side of the slider two.

[0019] By adopting the above technical solution, the beneficial effects of the present invention are as follows: The three-core-pulling mold provided by this invention, after injection molding and demolding, firstly, the upper mold moves upward, and through the cooperation of the inclined ejector rod on the upper mold and the inclined insertion hole on the second slider, the second slider is driven to move, completing the linear movement of the second core for core pulling and demolding; the driving device then drives the first slider to move forward, and at the same time as the first slider moves forward, the rotating arm is driven to rotate through the linkage bar; the first slider moves forward, completing the linear movement of the first core for core pulling and demolding; the rotation of the rotating arm drives the third core to rotate, completing the rotational core pulling and demolding of the third core.

[0020] During the demolding process described above, the sliding block two that drives the demolding of core two forms a sliding engagement with the connecting rod of core three, thus solving the problem of mutual interference that may occur during core pulling and demolding.

[0021] Because the connecting rod is a slender structure, and slider two is slidably connected to the connecting rod, slider two may experience jamming or sticking during its sliding process, especially at the beginning of its movement. This can exert a force on the slender connecting rod, causing deformation or displacement. To solve this problem, an anti-pull tube is fitted onto the connecting rod. The length of the anti-pull tube is shorter than the length of the connecting rod. This way, regardless of whether slider two moves to the left or right, the anti-pull tube will initially move accordingly, thus resolving the problem of slider two easily jamming or sticking with the connecting rod during its initial movement. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of the injection-molded product of the present invention. Figure 2 This is a schematic diagram of the structure of the present invention.

[0024] Figure 3 This is a structural diagram showing the disassembled upper and lower molds of the present invention. Figure 1 .

[0025] Figure 4 This is a structural diagram showing the disassembled upper and lower molds of the present invention. Figure 2 .

[0026] Figure 5 This is a schematic diagram of the structure of the lower mold of the present invention.

[0027] Figure 6This is an exploded structural diagram of the slider 2 and rotating arm of the lower mold of the present invention.

[0028] Figure 7 This is a top view of the lower mold of the present invention.

[0029] Figure 8 This is a schematic diagram showing the disassembled structure of slider one, slider two, and rotating arm of the present invention.

[0030] Figure 9 This is a schematic diagram of the cooling channel configuration of the present invention.

[0031] Figure 10 This is a schematic diagram of the rotary drive structure of the present invention.

[0032] Figure 11 This is a schematic diagram of the structure of the template of the present invention.

[0033] Figure 12 This is a cross-sectional view of the slider 2 and the rotating arm of the present invention.

[0034] The following are the labels in the attached diagram: Upper mold 1, Lower mold 2, Cavity 1 3, Cavity 2 4, Cavity 3 5, Slider 1 6, Core 1 7, Rotating arm 8, Core 3 9, Connecting rod 10, Slider 2 11, Core 2 12, Through hole 13, Anti-pull tube 14, Angled insertion hole 15, Angled ejector rod 16, Linkage bar 17, Guide rail 18, Drive device 19, Positioning block 20, Positioning groove 21, Template 22, Cooling channel 1 23, Cooling channel 2 24, Slide rail 25, Slide groove 26. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] For reference as follows Figures 1-12 The present invention will be described as follows: Example: A three-core-pulling mold mainly consists of an upper mold 1 and a lower mold 2 forming the main mold opening and closing structure. The lower mold 2 has two symmetrically distributed lower cavities on its upper side, and the upper mold 1 has upper cavities on its lower side that correspond one-to-one with the lower cavities. After the upper mold 1 and lower mold 2 complete the mold closing action, each lower cavity and its corresponding upper cavity are joined together to form a closed molding cavity, providing molding space for the injection molding of plastic products.

[0037] The upper mold 1 has an injection channel inside. One end of the injection channel is connected to the external injection molding equipment and the other end is connected to the molding cavity. The molten material can be transported to the molding cavity through the injection channel. The mold adopts a dual-cavity structure layout. A single injection molding process can simultaneously complete the molding of two identical plastic products, effectively improving the efficiency of mold injection molding production.

[0038] The lower cavity on the surface of the lower mold 2 is an irregularly shaped combined cavity. A single lower cavity consists of three parts: cavity one 3, cavity two 4, and cavity three 5. The cavities are connected in sequence and formed into an integral structure.

[0039] Cavity 1 (3) is arranged along the front-to-back direction of the mold and has a straight cavity structure; Cavity 2 (4) is arranged along the left-to-right direction of the mold and has a straight cavity structure; Cavity 3 (5) is an arc-shaped cavity, with its two ends connecting the ends of Cavity 1 (3) and Cavity 2 (4) respectively, thus realizing the connection between Cavity 1 (3) and Cavity 2 (4). The overall cavity is suitable for molding and processing irregularly shaped and bent plastic products.

[0040] This mold is equipped with three different types of core-pulling mechanisms, which correspond to the demolding of undercut structures at different positions inside the molding cavity. These include front and rear linear core-pulling mechanisms, left and right linear core-pulling mechanisms, and circular arc rotary core-pulling mechanisms. Slider 1 6, slider 2 11, and rotating arm 8 are set as the core driving motion components, which work together with various types of cores to complete the core-pulling action.

[0041] A guide rail 18 is fixedly installed on the front side of the lower mold 2. The layout direction of the guide rail 18 is consistent with the layout direction of the cavity 3, which is front and back.

[0042] Slider 6 is mounted on top of guide rail 18, and the two are connected by a sliding fit. Guide rail 18 limits the displacement of slider 6, restricting slider 6 to only move back and forth in a straight line in the front and back direction, and preventing lateral deviation.

[0043] A drive device 19 is mounted on the guide rail 18. In this scheme, the drive device 19 is a cylinder. The power output end of the cylinder is fixedly connected to the slider 6. The slider 6 is driven to complete the forward and backward linear movement by the extension and retraction power of the cylinder.

[0044] Two cores 7 are fixedly connected to the rear side of slider 6. The two cores 7 are arranged in a one-to-one correspondence with the two sets of cavities 3 on the lower mold 2. Core 7 is the forming core inside cavity 3.

[0045] As the slider 6 moves back and forth on the guide rail 18, it can simultaneously drive the core 7 to move synchronously, realizing the insertion of the core 7 into the cavity 3 for forming and the extraction and demolding action from the cavity 3, thus completing the linear core pulling operation in the front and back directions.

[0046] A rotating arm 8 is mounted on each of the left and right sides of the lower mold 2, with the two rotating arms 8 symmetrically distributed. A rotating shaft is fixedly installed on the surface of the lower mold 2, and a shaft hole is opened inside the rotating arm 8. The rotating shaft and the shaft hole are fitted with a clearance fit to achieve a hinged assembly, allowing the rotating arm 8 to rotate around the rotating shaft. The rotation axis of the rotating arm 8 is kept coaxial with the central axis of the cavity 5, ensuring that the rotation trajectory matches the trajectory of the arc cavity.

[0047] The cavity 35 is equipped with a core 3 9 with an arc-shaped structure. The central axis of the core 3 9 is coaxial with the central axis of the cavity 3 5, ensuring that the core 3 9 cooperates with the inner wall of the cavity 3 5 to complete the molding operation.

[0048] One end face of core 39 abuts against the end face of core 17, achieving fitting and limiting of the two core end faces; the other end of core 39 is fixedly connected to one end of connecting rod 10.

[0049] The connecting rod 10 adopts a slender rod-shaped structure and is arranged horizontally along the left and right direction of the mold. The end of the connecting rod 10 away from the core 3 9 is fixedly connected to the rotating arm 8, so that the core 3 9, the connecting rod 10, and the rotating arm 8 form an integrated connection structure.

[0050] When the rotating arm 8 rotates around the rotating shaft, it can drive the core 9 to rotate in an arc around the central axis of the cavity 5 through the connecting rod 10, so as to realize the core 9 being rotated out of the cavity 5 and complete the rotation core pulling operation in the arc position.

[0051] A slider 21 is set on each of the left and right sides of the lower mold 2. The slider 21 is positioned on the outside of the cavity 2 4. The rotating arm 8 restricts the displacement of the slider 21, so that the slider 21 can only slide in a straight line in the left and right direction.

[0052] A slide rail 25 is provided on the upper surface of the rotating arm 8. The slide rail 25 is arranged in the left-right direction and has a T-shaped cross-section. A groove 26 matching the structure of the slide rail 25 is provided on the lower side of the slider 11. The groove 26 slides in conjunction with the slide rail 25 to realize the movable connection between the slider 11 and the rotating arm 8. In this configuration, when the rotating arm 8 rotates, it can drive the slider 11 to rotate synchronously, and the slider 11 can slide left and right relative to the rotating arm 8.

[0053] The inner end face of the slider 2 11 near the lower cavity is fixedly installed with the core 2 12. The core 2 12 corresponds to the position of the cavity 2 4 and is the forming core inside the cavity 2 4. The inner end face of the core 2 12 abuts against the end face of the core 3 9 away from the core 1 7. The ends of the three cores (core 1 7, core 3 9, and core 2 12) are attached to each other in pairs, forming a complete irregular forming core structure after the mold is closed.

[0054] A through hole 13 is formed inside both the slider 2 11 and the core 2 12, penetrating the core 2 12 and the slider 2 11 body in a left-right direction. An anti-pull tube 14 is slidably sleeved on the outside of the connecting rod 10. The anti-pull tube 14 has a tubular structure, and its axial length is less than that of the connecting rod 10, allowing for the sliding stroke of the connecting rod 10. The anti-pull tube 14 is integrally nested inside the through hole 13, and the outer wall of the anti-pull tube 14 forms a sliding connection with the inner wall of the through hole 13.

[0055] The inner diameter of the anti-pull tube 14 is equal to the outer diameter of the connecting rod 10, so that the inner wall of the anti-pull tube 14 and the outer wall of the connecting rod 10 can slide in close contact; the outer diameter of the anti-pull tube 14 is equal to the inner diameter of the perforation 13, so that the outer wall of the anti-pull tube 14 and the inner wall of the perforation 13 can slide in close contact.

[0056] Lubrication treatment or friction reduction structure is provided between the contact surfaces of the anti-pull tube 14 and the connecting rod 10, and between the contact surfaces of the anti-pull tube 14 and the wall of the perforation 13, to reduce the sliding friction between the two contact surfaces and reduce sliding jamming and wear.

[0057] Because connecting rod 10 is a slender rod-shaped structure with relatively weak structural rigidity, slider 11 is prone to jamming or sticking with connecting rod 10 at the moment of initiation of left and right sliding. This results in radial tension and torque on connecting rod 10, causing deformation and displacement deviation. Anti-pull tube 14 can preferentially follow slider 11 in synchronous movement when slider 11 initiates sliding. By buffering the instantaneous force of sliding, anti-pull tube 14 isolates slider 11 from direct hard friction with connecting rod 10, eliminating the jamming phenomenon, preventing deformation of the slender connecting rod 10, and ensuring the stability of structural movement.

[0058] The upper side of slider 2 11 has a slanted insertion hole 15, which is an inclined through hole structure; the lower side of the upper mold 1 is fixedly installed with a slanted ejector rod 16, and the inclination angle and the arrangement position of the slanted ejector rod 16 correspond one-to-one with the slanted insertion hole 15. In the mold closed state, the slanted ejector rod 16 is inserted into the slanted insertion hole 15 to realize the linkage between the upper mold 1 and slider 2 11.

[0059] When the mold is opened, the upper mold 1 moves vertically upward, and the inclined ejector rod 16 moves upward synchronously and gradually disengages from the inclined insertion hole 15. The inclined rod wall of the inclined ejector rod 16 generates a lateral thrust on the hole wall of the inclined insertion hole 15, driving the sliders 11 on the left and right sides to move away from each other in a straight line, and simultaneously driving the core 12 to disengage from the cavity 4, thus completing the lateral straight core pulling demolding.

[0060] When the mold is closed, the upper mold 1 moves vertically downwards, the inclined ejector rod 16 is gradually inserted into the inclined insertion hole 15, the inclined rod wall presses against the hole wall and drives the two sliders 11 to move closer to each other in a straight line, which drives the core 12 to reset and enter the cavity 4, thus completing the core closing and resetting action.

[0061] A linkage bar 17 is hinged to each of the left and right sides of slider 6. The linkage bar 17 is a long transmission rod. One end of a single linkage bar 17 is hinged to the side of slider 6, and the other end is hinged to the outer wall of the rotating arm 8 on the same side. The hinged connection method can eliminate rigid stress in the transmission process and is suitable for multi-angle transmission.

[0062] When the drive device 19 moves the slider 6 in the front-to-back direction, the slider 6 pulls or pushes the rotating arm 8 through the linkage bars 17 hinged on both sides, causing the rotating arm 8 to rotate around the axis. Because the core 9, connecting rod 10, and rotating arm 8 are an integrated structure, the rotating arm 8 synchronously drives the core 9 to rotate along an arc trajectory during rotation, so that the core 9 passes through the cavity 4 and moves out of the molding cavity, completing the rotational core pulling and demolding; at the same time, when the rotating arm 8 rotates, the slider 11 follows the rotating arm 8 to rotate synchronously in a circle, adapting to the overall core pulling motion trajectory.

[0063] The upper surfaces of slider 1 (6) and slider 2 (11) are provided with upwardly protruding positioning blocks 20, which are rigid protruding positioning structures; the lower side of the upper mold 1 is provided with positioning grooves 21, and the number, position and shape of the positioning grooves 21 match the positioning blocks 20 one by one.

[0064] After the mold completes the mold closing action, the positioning block 20 is inserted into the corresponding positioning groove 21. Through the interlocking of the positioning block 20 and the positioning groove 21, the displacement of slider 1 6 and slider 2 11 is limited, restricting the two sliders from shifting or shaking during the injection molding process. This forms a mechanical locking structure, ensuring the positional accuracy of the core and sliders during the injection molding process and avoiding defects such as flash and dimensional deviation in plastic products.

[0065] The surface of the lower mold 2 body is machined with a groove structure. The groove accommodates all moving parts, including slider 1 6, rotating arm 8, and slider 2 11. This reduces the overall space occupied by the mold and promotes an integrated layout structure. On the other hand, the side walls of the groove provide lateral restraint for each part, improving motion stability and preventing damage to the external structure from collisions.

[0066] Replaceable templates 22 are fitted to the lower side of the upper mold 1 and the upper side of the lower mold 2. The upper and lower cavities are directly machined onto the surface of the templates 22, rather than the mold body itself. Sealing cavities are formed at the edges of the templates 22, which are coaxially connected to cavity 3 and cavity 4, respectively, and extend through the edges of the templates 22. Core 7 is fixedly connected to slider 6 via a sealing part, and core 12 is fixedly connected to slider 11 via a sealing part. After the mold is closed, the sealing part and the sealing cavity fit tightly together to form a sealing fit, preventing molten material from entering the sliding gap and preventing material overflow and adhesion to moving parts. At the same time, the templates 22 can be disassembled and replaced individually to adapt to the processing of products of different specifications, reducing mold modification costs.

[0067] This mold is equipped with two independent but interconnected cooling channels: Cooling Channel 1 (23) and Cooling Channel 2 (24). Cooling Channel 1 (23) passes through Core 2 (12), Connecting Rod 10, and Rotating Arm 8 in sequence; Cooling Channel 2 (24) passes through Core 1 (7) and Slider 1 (6). A sealing ring is installed at the contact end face of Core 1 (7) and Core 3 (9), and the two cooling channels are interconnected at this contact point, forming a complete closed-loop cooling circulation pipeline.

[0068] Cooling medium (air) can be introduced into the cooling channel and flow through all the cores to uniformly cool the plastic products inside the molding cavity, shorten the cooling and setting time of injection molded products, and improve production efficiency; the sealing ring can prevent the cooling medium from leaking from the core fitting gap.

[0069] After the injection material in this mold has cooled and solidified, a three-step core-pulling and demolding process is performed in a fixed sequence. The specific process is as follows: Lateral linear core pulling: The upper mold 1 moves upward to open the mold, the inclined ejector rod 16 moves upward simultaneously and gradually disengages from the inclined insertion hole 15, and the left and right sliders 11 move away from each other by the inclined thrust, driving the core 12 to be pulled out from the cavity 4, thus completing the lateral linear core pulling demolding.

[0070] Front-mounted linear core pulling: The drive device 19 drives the slider 6 to move forward along the guide rail 18. The slider 6 drives the core 7 to move forward synchronously, so that the core 7 is separated from the cavity 3, completing the linear core pulling demolding in the front and rear directions.

[0071] Arc-shaped rotating core pulling: During the forward movement of slider 16, the rotating arm 8 is pulled around the rotating axis by the linkage bar 17 on both sides. The rotating arm 8 drives the core 3 9 to make an arc-shaped rotating motion through the connecting rod 10. The core 3 9 passes through cavity 2 4 and completely moves out of the molding cavity, completing the arc-shaped rotating core pulling demolding.

[0072] The core technological advantages of this mold: The slider 11 that completes the lateral core pulling operation and the connecting rod 10 that drives the arc-shaped core adopt a sliding engagement method. During the sliding process, the slider 11 can slide relative to the connecting rod 10 to avoid structural interference problems caused by the two core pulling movements and ensure that multi-directional core pulling is carried out synchronously and orderly.

[0073] An anti-pull tube 14 is sleeved on the outside of the connecting rod 10. The anti-pull tube 14 buffers the jamming force when the slider 11 starts to slide, so as to avoid deformation and displacement of the slender connecting rod 10 under external force, thereby improving the service life and structural stability of the connecting rod 10.

[0074] Three-in-one core-pulling structure: integrates three core-pulling methods: front and back straight lines, left and right straight lines, and circular arc rotation, which are suitable for demolding irregularly shaped bent plastic products with undercuts, and have a wider range of applicable processing applications.

[0075] By locking the positioning block 20 into the positioning groove 21, the slider displacement during injection molding is prevented, ensuring the product molding accuracy.

[0076] The cooling channel runs through the entire core and works with the end face sealing ring to achieve sealed cooling, resulting in uniform cooling without leakage, improving cooling efficiency and enhancing product molding quality.

[0077] The use of detachable template 22 facilitates cavity replacement, maintenance, and reduces mold usage costs.

[0078] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A three-core-pulling mold, comprising an upper mold and a lower mold, wherein the upper side of the lower mold has two symmetrically arranged lower cavities, and the lower side of the upper mold has an upper cavity corresponding to the lower cavities; the lower cavities include a cavity one arranged in a front-back direction and a cavity two arranged in a left-right direction, and further include a cavity three connecting the cavity one and the cavity two, the cavity three being arc-shaped, characterized in that: The front side of the lower mold is provided with a slider that can only move back and forth, and the rear side of the slider is provided with two cores that correspond to the two cavities respectively. The lower mold has rotatable rotating arms on its left and right sides respectively. The rotation axis of the rotating arms is coaxial with the central axis of the cavity three. The cavity three has an arc-shaped core three. One end of the core three abuts against the core one, and the other end of the core three is fixedly connected to the rotating arm through a connecting rod. The connecting rod is set in the left and right direction. The lower mold has two sliders on its left and right sides that can only slide left and right. The end face of the slider two near the lower cavity has a core two. The other end of the core two abuts against the core three. The slider two slides in cooperation with the rotating arm. It also includes a through hole that runs through the core 2 and the slider 2 in the left-right direction. An anti-pull tube is slidably sleeved on the connecting rod. The length of the anti-pull tube is less than the length of the connecting rod. The anti-pull tube is slidably connected to the through hole. The left and right sides of the slider 1 are respectively provided with linkage bars. One end of the linkage bar is hinged to the slider 1, and the other end of the linkage bar is hinged to the corresponding rotating arm. The slider 1 can move back and forth and drive the rotating arm to rotate through the linkage bar. The connecting rod is a slender rod-shaped structure.

2. The three-core-pulling mold according to claim 1, characterized in that: The upper side of the slider two is provided with an oblique insertion hole, and the lower side of the upper mold is provided with an oblique push rod that is inserted into the oblique insertion hole.

3. A three-core-pulling mold according to claim 1, characterized in that: The lower mold has a guide rail on its front side along the front-back direction, and the slider 1 slides with the guide rail. The guide rail is equipped with a drive device to drive the slider 1 to move back and forth.

4. A three-core-pulling mold according to claim 1, characterized in that: The slider one and slider two are respectively provided with upward protruding positioning blocks, and the lower side of the upper mold is provided with positioning grooves that are connected to the positioning blocks.

5. A three-core-pulling mold according to claim 1, characterized in that: The lower mold has a groove structure formed to accommodate slider one, rotating arm, and slider two.

6. A three-core-pulling mold according to claim 1, characterized in that: The lower side of the upper mold and the upper side of the lower mold are respectively provided with replaceable templates, and the upper cavity and the lower cavity are respectively set on the templates.

7. A three-core-pulling mold according to claim 1, characterized in that: It also includes a cooling channel 1 that runs through core 2, connecting rod and rotating arm, a cooling channel 2 that runs through core 1 and slider 1, and cooling channels 1 and 2 that are connected to each other at the abutting positions of core 1 and core 3.

8. A three-core-pulling mold according to claim 1, characterized in that: The rotating arm is provided with a slide rail along the left and right direction. The slide rail has a T-shaped cross section, and the lower side of the slider is provided with a corresponding slide groove.

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