Injection molding system and method based on magnetic field assistance

Abstract

The invention discloses an injection molding system and method based on magnetic field assistance. The injection molding system comprises an injection molding machine and an injection mold installed on the injection molding machine. The injection molding machine comprises a machine tool fixed plate, a machine tool movable plate and a plurality of machine tool guide rods; the machine tool guide rod is sequentially arranged among the machine tool fixed plate, the injection mold and the machine tool movable plate in a penetrating manner; the injection mold is internally provided with at least two cavities, each cavity is used for forming a corresponding product contour, the injection mold is internally provided with a plurality of magnetic conductive parts and non-magnetic conductive parts, the magnetic conductive parts are in butt joint with the machine tool fixed plate side or the machine tool movable plate side to form a magnetic circuit, and the non-magnetic conductive parts are in butt joint with the machine tool fixed plate side or the machine tool movable plate side. The non-magnetic components are used for isolating adjacent magnetic circuits and preventing short circuit of the magnetic circuits; and one or more magnetic circuits jointly defined by the magnetic conductive component and the non-magnetic conductive component pass through the cavity in a concentrated manner.

Description

Technical Field

[0001] This invention relates to the field of injection molding machine technology, and specifically to a magnetic field-assisted injection molding system and method. Background Technology

[0002] In conventional injection molding processes, the core equipment consists of an injection molding machine and the injection mold mounted on it. The main function of the mold is to physically shape molten plastic and other materials through its internal cavity structure and then solidify them through cooling. These molds are typically made of mold steels such as P20 and H13. Although these steels are ferromagnetic materials, in traditional mold design and injection molding processes, their magnetism is usually an untapped inherent property and has not been designed as an active, functional system.

[0003] However, in certain advanced manufacturing fields, such as insert molding where metal inserts are magnetically attracted and fixed within a mold, or when a magnetic field is used to orient special materials during the molding process, a stable and precisely oriented magnetic field needs to be applied to the mold cavity area during the injection molding process.

[0004] To meet this requirement, existing technologies typically attempt to apply a magnetic field directly to the mold from the outside, or simply embed a permanent magnet into the mold. However, these methods suffer from the following insurmountable technical problems:

[0005] The magnetic circuit path cannot be precisely controlled, resulting in severe magnetic flux leakage: Traditional injection molds are structurally a single, integral magnetic conductor. When an external magnetic field (e.g., a magnetic plate from the injection molding machine tool) acts on the mold, the magnetic lines of force randomly search for the path of least magnetic resistance throughout the mold body, rather than actively and centrally passing through the relatively small cavity area. This causes most of the magnetic flux to short-circuit along the mold periphery or between mold plates, resulting in severe magnetic leakage. Consequently, the magnetic field strength inside the critical cavity is insufficient and its distribution is extremely uneven, failing to meet process requirements.

[0006] Inefficient magnetic field introduction and loop construction: A magnetic field needs to originate from a source, pass through the core area of ​​the mold, and return to the other pole to form an effective closed loop. Current technology lacks a systematic design that allows the magnetic field to be introduced from the injection molding machine into the mold with low loss and guides it to complete the working loop. The transmission path of the magnetic field at the contact surface between the machine tool and the mold, as well as inside the mold, is unclear, resulting in high energy loss and low overall system energy efficiency. Summary of the Invention

[0007] In order to overcome the technical defects of existing technologies, such as chaotic magnetic field paths and severe leakage of magnetic flux in non-working areas, this invention provides a magnetic field-assisted injection molding system and method.

[0008] To solve the above problems, the present invention is implemented according to the following technical solution:

[0009] The first aspect of this invention provides a magnetic field-assisted injection molding system:

[0010] Includes an injection molding machine and an injection mold mounted on the injection molding machine;

[0011] The injection molding machine includes a machine tool fixed plate, a machine tool movable plate, and several machine tool guide rods;

[0012] The machine tool guide rod connects the machine tool fixed plate and the machine tool movable plate, and the injection mold is located between the machine tool fixed plate and the machine tool movable plate;

[0013] The injection mold has at least two cavities, each cavity is used to form a corresponding product outline, and the injection mold has a number of magnetic and non-magnetic components inside it. The magnetic components are connected to the fixed plate side or the movable plate side of the machine tool to form a magnetic circuit, and the non-magnetic components are used to isolate adjacent magnetic circuits and prevent short circuits in the magnetic circuits.

[0014] The magnetically conductive component and the non-magnetically conductive component together define one or more magnetic paths that converge through the cavity.

[0015] In conjunction with the first aspect, the present invention provides a first embodiment of the first aspect, wherein the magnetic conductive component includes a first magnetic conductive component and a second magnetic conductive component, the first magnetic conductive component and the second magnetic conductive component being respectively disposed on opposite sides of the cavity.

[0016] In conjunction with the first aspect, the present invention provides a second embodiment of the first aspect, wherein the injection mold further includes a fixed mold magnetic guide side plate, the magnetic route being provided by the magnetic force device of the injection molding machine, and the magnetic route sequentially including:

[0017] The input magnetic path is composed of the machine tool fixed plate, the fixed mold magnetic guide side plate and the first magnetic guide component. The first magnetic guide component is configured to guide the magnetic path through the cavity for the first time.

[0018] The transition magnetic path is composed of the machine tool guide rod, the machine tool movable plate, and the second magnetic guiding component, and is used to conduct magnetic circuit. The second magnetic guiding component is configured to receive the magnetic circuit from the transition magnetic path and guide it to pass through the cavity a second time.

[0019] The magnetic path is returned to guide the magnetic path that passes through the cavity a second time back to the machine tool guide rod to form a loop of the magnetic path.

[0020] In conjunction with the first aspect, the present invention provides a third embodiment of the first aspect, wherein an ejection mechanism is provided in the injection mold, the ejection mechanism has an ejector pin, the end of the ejector pin is provided with a non-magnetic section made of non-magnetic material, the non-magnetic section is connected to the ejector pin body by welding, so as to reduce magnetic interference at the ejection part.

[0021] In conjunction with the first aspect, the present invention provides a fourth embodiment of the first aspect, wherein the injection mold is further provided with a lateral core-pulling mechanism driven by a cylinder, the lateral core-pulling mechanism being configured to perform a lateral core-pulling action in the magnetic field environment;

[0022] The lateral core-pulling mechanism includes a core-pulling slider and a guide limiting component.

[0023] In conjunction with the first aspect, the present invention provides a fifth embodiment of the first aspect, wherein the number of cavities is two, the two cavities are symmetrically arranged along the width direction of the injection mold, and the cavities are aligned with the magnetic circuit path, so that the magnetic circuit path passes through each cavity simultaneously or separately.

[0024] In conjunction with the first aspect, the present invention provides a sixth embodiment of the first aspect, wherein the injection mold is provided with a temperature control cooling module, the temperature control cooling module includes cooling water channels arranged in a ring around each cavity, and a sealing ring groove for installing a sealing ring is provided around the cooling water channels.

[0025] In conjunction with the first aspect, the present invention provides a seventh embodiment of the first aspect, wherein the cooling water channel is interconnected between the two cavities to form a circulation loop, and the cooling water channel is located in the area surrounded by the sealing ring groove.

[0026] A second aspect of the present invention provides a magnetic field-assisted injection molding method using a magnetic field-assisted injection molding system as described in the first aspect of the present invention, characterized by comprising the following steps:

[0027] S1: Install the injection mold and control the injection molding machine to close the mold;

[0028] S2: Activate the magnetic device of the injection molding machine to generate a magnetic field and guide the magnetic field from the side of the machine tool fixing plate into the injection mold;

[0029] S3: A closed magnetic circuit is established using the machine tool guide rod as part of the magnetic circuit loop; the magnetic field passes through the first magnetic conductive component, the cavity, and the second magnetic conductive component in sequence, and is conducted to the machine tool guide rod via the machine tool movable plate, and flows back to the machine tool fixed plate along the machine tool guide rod;

[0030] S4: Molten material is injected into the cavity, and pressure is maintained and cooled under the action of the closed magnetic field to complete the product molding;

[0031] S5: The injection mold is opened, and the non-magnetic section at the end of the ejector pin is used to block the magnetic attraction, and the product is ejected by the ejection mechanism.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] This invention discloses a magnetic field-assisted injection molding system and method. Through magnetic and non-magnetic components installed within the injection mold, these components connect with the machine tool fixed plate, movable plate, and guide rod of the injection molding machine, forming one or more magnetic paths. This allows magnetic lines of force to concentrate and pass through at least two cavities, achieving precise magnetic field-assisted orientation of the molten material during injection molding. This improves the mechanical properties of the product and avoids the poor orientation and energy loss problems caused by uneven magnetic field distribution in traditional injection molding. Simultaneously, the non-magnetic components effectively isolate adjacent magnetic paths, preventing short circuits and magnetic leakage, ensuring stable magnetic field strength, and improving production efficiency. The multi-cavity design allows for the molding of multiple products at once, shortening the production cycle and making it suitable for molding complex shapes. It offers advantages such as simple structure, low cost, and high automation. Attached Figure Description

[0034] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, wherein:

[0035] Figure 1 This is a front view of the magnetic circuit of the injection mold assembly of the present invention;

[0036] Figure 2 This is a schematic diagram showing the positions of the magnetic and non-magnetic components inside the injection mold of this invention;

[0037] Figure 3 This is a top view of the internal magnetic circuit of the injection mold of the present invention;

[0038] Figure 4 This is a schematic diagram of the ejection mechanism of the present invention;

[0039] Figure 5 This is a side view of the lateral core-pulling mechanism and the injection mold of the present invention;

[0040] Figure 6 This is a schematic diagram of the temperature control and cooling module inside the injection mold of the present invention;

[0041] Figure 7 This is a flowchart of the steps of a magnetic field-assisted injection molding method according to the present invention;

[0042] In the picture:

[0043] 11-Injection mold, 12-Machine tool fixed plate, 13-Machine tool movable plate, 14-Machine tool guide rod;

[0044] 20-Cavity, 21-Fixed mold component, 22-Moving mold component, 23-Guide post, 24-Guide sleeve;

[0045] 30-Magnetic conductive component, 31-Non-magnetic conductive component, 32-First magnetic conductive component, 33-Second magnetic conductive component, 34-Fixed mold magnetic conductive side plate, 35-Machine tool non-magnetic plate;

[0046] 40 - Ejection mechanism, 41 - Ejector pin, 411 - Non-magnetic section, 412 - Ejector pin body, - Annular non-magnetic washer;

[0047] 50 - Lateral core-pulling mechanism, 51 - Cylinder, 52 - Core-pulling slider, 53 - Guide limiter, 55 - Connecting rod;

[0048] 60 - Temperature-controlled cooling module; 61 - Cooling water channel; 62 - Sealing ring groove; 63 - Sealing ring;

[0049] 70-Products. Detailed Implementation

[0050] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0051] Example 1

[0052] like Figures 1-5 As shown, the first aspect of the present invention provides a magnetic field-assisted injection molding system, including an injection molding machine and an injection mold 11 mounted on the injection molding machine;

[0053] The injection molding machine includes a machine tool fixed plate 12, a machine tool movable plate 13, and several machine tool guide rods 14;

[0054] The machine tool guide rod 14 is sequentially inserted between the machine tool fixed plate 12, the injection mold 11 and the machine tool movable plate 13;

[0055] The injection mold 11 has at least two cavities 20, each cavity 20 is used to form the outline of the corresponding product 70. The injection mold 11 has a number of magnetic conductive components 30 and non-magnetic conductive components 31 inside it. The magnetic conductive components 30 are connected to the side of the machine tool fixed plate 12 or the side of the machine tool movable plate 13 to form a magnetic circuit. The non-magnetic conductive components 31 are used to isolate adjacent magnetic conductive circuits and prevent short circuits in the magnetic circuits.

[0056] The magnetically conductive component 30 and the non-magnetically conductive component 31 together define one or more magnetic paths that pass through the cavity 20.

[0057] Preferably, there are four machine tool guide rods 14, symmetrically distributed along the four corners of the machine tool fixing plate 12. The machine tool guide rods 14 are made of high magnetic permeability material (such as 40Cr tempered steel or iron-nickel alloy), and their outer surfaces are finely ground and polished to ensure magnetic continuity and reduce hysteresis loss. The machine tool guide rods 14 are made of magnetically conductive material, and their function is not only to provide guidance for the opening and closing of the mold, but also to serve as part of the magnetic circuit to assist in the closure of the entire magnetic circuit.

[0058] The machine tool guide rod 14 is sequentially inserted between the machine tool fixed plate 12, the injection mold 11, and the machine tool movable plate 13, serving as a guide and magnetic field transmission mechanism during mold closing. Optionally, a magnetic pad is provided between the machine tool guide rod 14 and the machine tool fixed plate 12 to enhance the magnetic contact effect and reduce the contact resistance.

[0059] The injection mold 11 includes a fixed mold component 21 and a moving mold component 22. The fixed mold component 21 is fixed to the machine tool fixed plate 12 by bolts, while the moving mold component 22 is fixed to the machine tool movable plate 13 by a connecting sleeve. The two are precisely aligned by guide pins 23 and guide sleeves 24.

[0060] The injection mold 11 has at least two cavities 20 inside, each cavity 20 being used to form the contour of the corresponding product 70. Preferably, the dimensional tolerance of each cavity 20 is controlled within ±0.02mm to ensure the symmetry of the magnetic field distribution and the accuracy of the product. The cavity 20 can be circular, annular, or rectangular, and the specific shape is determined according to the requirements of the molded product.

[0061] Inside the injection mold 11, there are several magnetically conductive components 30 and non-magnetically conductive components 31.

[0062] The magnetically conductive component 30 is made of a high-permeability material, such as pure iron (Fe≥99.8%), permalloy (Ni80Fe20) or soft magnetic steel, and is annealed to eliminate residual stress.

[0063] The non-magnetic component 31 is made of austenitic stainless steel (304, 316) or aluminum alloy and is used to isolate the magnetic field and limit its diffusion. Specifically, the non-magnetic component 31 can be a non-magnetic isolation block set at a specific position inside the mold, or it can be a non-magnetic plate 35 of the machine tool set between the mold and the contact surfaces of the machine tool fixed plate 12 and the machine tool movable plate 13. The non-magnetic plate 35 of the machine tool plays a magnetic isolation role, blocking the possibility of short circuit of the magnetic field on the machine tool plate.

[0064] Preferably, the magnetically conductive component 30 and the non-magnetically conductive component 31 are installed inside the injection mold 11 template, and a non-magnetically conductive gap of 0.1 to 0.3 mm is left between the magnetically conductive components 30 to avoid magnetic field short circuit and ensure that the magnetic field path is concentrated along the cavity 20 area.

[0065] The magnetically conductive components 30 and non-magnetically conductive components 31 are distributed alternately, jointly defining one or more magnetic circuit paths, so that the magnetic lines of force are concentrated through the cavity 20 region.

[0066] In the preferred embodiment, the magnetic circuit path is arranged perpendicular to the parting surface of the cavity to obtain the ideal magnetization effect.

[0067] Optionally, to further improve the magnetic field concentration, an annular magnetic field limiting groove can be embedded around the magnetic conductive component 30 on the fixed mold side to reduce the leakage of the peripheral magnetic field.

[0068] In conjunction with the first aspect, the present invention provides a first embodiment of the first aspect. Specifically, the magnetic conductive component 30 includes a first magnetic conductive component 32 and a second magnetic conductive component 33, which are respectively disposed on opposite sides of the cavity 20.

[0069] The magnetic conductive component 30 includes a first magnetic conductive component 32 and a second magnetic conductive component 33, which are respectively disposed on opposite sides of the cavity 20.

[0070] Preferably, the first magnetic conductive component 32 is located on the side near the machine tool fixed plate 12, and is used to receive the magnetic field generated by the magnetic source and guide it into the cavity 20; the second magnetic conductive component 33 is located on the side near the machine tool movable plate 13, and is used to receive the magnetic field conducted through the cavity 20 region and lead it out.

[0071] Optionally, the first magnetically conductive component 32 and the second magnetically conductive component 33 are made of the same material, such as pure iron, permalloy, or low-carbon soft magnetic steel, to ensure consistent magnetic permeability, thereby making the magnetic field path distribution symmetrical and the magnetic resistance balanced.

[0072] Preferably, the gap between the first magnetic conductive component 32 and the second magnetic conductive component 33 is less than 0.02 mm to ensure stable magnetic contact.

[0073] When the magnetic device of the injection molding machine is activated, the magnetic field is transmitted from the fixed mold side to the first magnetic conductive component 32, passes through the cavity 20, and is received by the second magnetic conductive component 33. Through this symmetrical arrangement, a main magnetic field channel distributed along the central axis of the product 70 can be formed, ensuring the consistency of the magnetic orientation direction of the product and improving the magnetic field effect.

[0074] In conjunction with the first aspect, the present invention provides a second embodiment of the first aspect. Specifically, the magnetic circuit is provided by the magnetic force device of the injection molding machine, and the magnetic circuit path includes, in sequence:

[0075] The input magnetic path is composed of the machine tool fixed plate 12, the fixed mold magnetic guide side plate 34 and the first magnetic guide component 32. The first magnetic guide component 32 is set to guide the magnetic path through the cavity 20 for the first time.

[0076] The input magnetic path consists of a machine tool fixing plate 12, a fixed mold magnetically conductive side plate 34, and a first magnetically conductive component 32. Preferably, the fixed mold magnetically conductive side plate 34 is tightly fitted to the machine tool fixing plate 12, and the contact surface is surface-polished. The magnetic field is first conducted along the machine tool fixing plate 12 to the fixed mold magnetically conductive side plate 34, and then guided through the cavity 20 by the first magnetically conductive component 32, achieving the first magnetic field crossing.

[0077] The transition magnetic path, consisting of the machine tool guide rod 14, the machine tool movable plate 13, and the second magnetically conductive component 33, is used to conduct the magnetic circuit. The second magnetically conductive component 33 is configured to receive the magnetic circuit from the transition magnetic path and guide it through the cavity 20 a second time. Preferably, the machine tool guide rod 14 is made of an iron-nickel alloy material, which has high permeability and low hysteresis loss. The transition magnetic path enables the vertical conduction of the magnetic field from the fixed mold side to the other side, serving as the energy transition region of the entire magnetic circuit.

[0078] The return magnetic path guides the magnetic path that has passed through cavity 20 a second time back to the machine tool guide rod 14 to form a magnetic path loop. The return magnetic path, via the machine tool guide rod 14, redirects the magnetic field back to the machine tool fixed plate 12, completing a closed magnetic field loop. To ensure magnetic path continuity, the upper and lower ends of the machine tool guide rod 14 employ a stepped plug-in structure, with the mating surfaces coated with a magnetically conductive lubricating film to improve magnetic contact stability. The magnetic path arrangement results in a reciprocating, closed-loop distribution of magnetic field lines, leading to a more concentrated magnetic field intensity distribution.

[0079] The specific magnetic circuit path is as follows: to the upper end of the machine tool guide rod 14, machine tool fixed plate 12, fixed mold magnetic guide side plate 34, cavity 20, first magnetic guide component 32, fixed mold magnetic guide side plate 34, lower end of machine tool guide rod 14, machine tool movable plate 13, second magnetic guide component 33, cavity 20, and back to the first magnetic guide component 32, fixed mold magnetic guide side plate 34, and upper end of machine tool guide rod 14; thus forming a closed magnetic flux loop that reciprocates along the cavity 20 region, so that the magnetic lines of force are concentrated through the cavity 20 region.

[0080] In this embodiment, it may optionally also include a reciprocating magnetic segment:

[0081] After receiving the magnetic field from the transition magnetic segment, the second magnetic conductive component 33 guides the magnetic field to pass through the cavity 20 again, achieving a secondary crossing of the magnetic field. The second magnetic conductive component 33 is isolated from the surrounding metal by an insulating gasket 36 to reduce magnetic field leakage.

[0082] In conjunction with the first aspect, the present invention provides a third embodiment of the first aspect. Specifically, an ejector mechanism 40 is provided in the injection mold 11. The ejector mechanism 40 has an ejector pin 41. The end of the ejector pin 41 is provided with a non-magnetic section 411 made of non-magnetic material. The non-magnetic section 411 is connected to the ejector pin body 412 by welding to reduce magnetic interference at the ejection part.

[0083] To address the difficulty of demolding caused by the magnetic attraction of the product 70 to the metal parts in a magnetic field environment, an ejection mechanism 40 is provided in the injection mold 11 to achieve demolding after the product 70 cools down.

[0084] The end of the ejector pin 41 that contacts the product 70 has a non-magnetic section 411 made of a non-magnetic material. In this embodiment, the length of the non-magnetic section 411 is 60 mm. The non-magnetic section 411 passes through the ejector pin body 412 of the ejector pin 41, and the two parts are connected by laser welding or brazing.

[0085] To prevent the weld from affecting the strength, an optional wear-resistant protective layer (0.05-0.1mm thick) can be applied to the weld.

[0086] The non-magnetic section 411 effectively blocks the magnetic flux through the ejector pin 41, preventing the formation of local magnetic saturation or biased magnetic areas in the ejector mechanism 40 region.

[0087] Preferably, an annular non-magnetic washer is provided around the mounting hole of the ejector pin 41 to further isolate the magnetic flux. This design ensures that the ejection action is not affected by magnetic adsorption, guaranteeing smooth demolding of the product 70.

[0088] By providing a non-magnetic section 411 at the end of the ejector pin 41, magnetization of the ejector pin 41 during operation can be effectively prevented, thus preventing the product 70 from being magnetically attracted to the end face of the ejector pin 41 and ensuring a smooth and reliable ejection process. This design aims to reduce magnetic interference at the ejection point. Preferably, the ejector pin 41 has also undergone a hardening heat treatment at HRC 58~60 to ensure sufficient strength and wear resistance.

[0089] In conjunction with the first aspect, the present invention provides a fourth embodiment of the first aspect. Specifically, the injection mold 11 is further provided with a lateral core-pulling mechanism 50 driven by a cylinder 51. The lateral core-pulling mechanism 50 is configured to achieve lateral core pulling in a magnetic field environment. The lateral core-pulling mechanism 50 includes a core-pulling slider 52 and a guide limiting member 53.

[0090] The lateral core-pulling mechanism 50 is driven by a cylinder 51. In this embodiment, the core-pulling mechanism 50, driven by the cylinder 51, includes a core-pulling slider 52, a guide limiter 53, a return spring, and a connecting rod 54. The return spring, located inside the lateral core-pulling mechanism 50, works in conjunction with the core-pulling slider 52, the guide limiter 53, and the connecting rod 54. After injection molding is completed and before mold opening, the cylinder 51 actuates, driving the core-pulling slider 52 and other components to move laterally, pulling the lateral core of the injection mold 11 out of the molded product 70, thus clearing the way for subsequent ejection and demolding operations. Preferably, the cylinder 51 is a high-temperature resistant magnetically shielded cylinder, with its housing made of non-magnetic stainless steel and an operating temperature range of -10℃ to 120℃. The core-pulling slider 52 moves horizontally along the side wall guide groove of the injection mold 11 to achieve lateral demolding of the product 70. The guide limiter 53 is made of a non-magnetic alloy to prevent magnetic fields from attracting the moving parts. Optionally, an insulating pad can be added to the bottom of the core-pulling slider 52 to minimize magnetic field interference on the sliding contact surface. In a magnetic field-assisted environment, the core-pulling mechanism 50 operates sensitively and is unaffected by magnetic resistance, effectively enabling the smooth demolding of side-hole and groove-type products 70. Preferably, the core-pulling stroke can be monitored by a limit pin position sensor to ensure the safety of automated production.

[0091] In conjunction with the first aspect, the present invention provides a fifth embodiment of the first aspect. Specifically, two cavities 20 are symmetrically arranged along the width direction of the injection mold 11, and the cavities 20 are aligned with the magnetic circuit path, so that the magnetic circuit path passes through each cavity 20 simultaneously or separately.

[0092] like Figure 2 As shown, the two cavities 20 are symmetrically arranged along the width direction of the injection mold 11 (i.e., on both sides of the vertical center line in the figure). In this embodiment, each cavity 20 is used to mold one product 70.

[0093] The key to the symmetrical structure lies in the alignment of the cavities 20 with the magnetic circuit paths. As shown by the arrows in the "Magnetic Circuit Direction" diagram, the constructed magnetic circuits are designed to enter from one side of the mold, branch out, and simultaneously pass through the core areas of both cavities 20, before exiting from the other side. This symmetrical structure ensures that during injection molding, both cavities 20 are subjected to magnetic fields of essentially the same strength and direction, thus guaranteeing a high degree of consistency in the magnetic properties of the two products 70 obtained from a single molding process. Therefore, the magnetic circuit paths are configured to pass through both cavities 20 simultaneously.

[0094] The various embodiments of the present invention can be combined or optimized as needed. For example, if the number of cavities 20 increases, multiple parallel magnetic circuits can be set.

[0095] If the magnetic strength needs to be adjusted, it can be achieved by adjusting the thickness or material of the magnetic conductive component 30.

[0096] Example 2

[0097] In conjunction with the first aspect, the present invention provides a sixth embodiment of the first aspect. Specifically, the injection mold 11 is provided with a temperature control cooling module 60. The temperature control cooling module 60 includes a cooling water channel 61 arranged in a ring around each cavity 20. The cooling water channel 61 is surrounded by a sealing ring groove 62 for installing a sealing ring 63.

[0098] like Figure 4 As shown, the temperature-controlled cooling module 60 is specifically a figure-eight annular temperature-controlled cooling water channel system. The temperature-controlled cooling water channel system includes cooling water channels 61 arranged annularly around each cavity 20. Since this embodiment has two symmetrical cavities 20, the cooling water channels 61 are designed as two interconnected annular passages, forming an overall figure-eight shape, thereby enabling uniform temperature control of the two cavity 20 areas. In this embodiment, the water tank depth of the cooling water channel 61 is 5.5 mm.

[0099] To prevent leakage of the cooling medium (such as cooling water) during use, a sealing ring groove 62 for installing the sealing ring 63 is provided around the cooling water channel 61. These sealing ring grooves 62 are annular grooves, and in this embodiment, their depth is 3mm, used to accommodate and fix the sealing ring 63 to ensure the sealing performance of the entire cooling system.

[0100] Example 3

[0101] The second aspect of the present invention provides an injection molding method for performing the first aspect, comprising the following steps: S1: installing an injection mold and controlling the injection molding machine to close the mold; S2: activating the magnetic device of the injection molding machine to generate a magnetic field and guide the magnetic field from the machine tool fixed plate side into the injection mold; S3: establishing a closed magnetic circuit using the machine tool guide rod as part of the magnetic circuit loop; the magnetic field passes sequentially through the first magnetic conductive component, the cavity, and the second magnetic conductive component, and is then conducted to the machine tool guide rod via the machine tool movable plate, and flows back to the machine tool fixed plate along the machine tool guide rod; S4: injecting molten material into the cavity, holding pressure and cooling under the action of the closed magnetic field to complete the product molding; S5: opening the injection mold, using the non-magnetic section at the end of the ejector pin to block magnetic adsorption, and ejecting the product through the ejection mechanism.

[0102] Detailed steps are as follows:

[0103] S1: Before injection molding production, the injection mold 11 is first installed on the injection molding machine 10. Specifically, one side of the injection mold 11 is installed on the machine tool fixed plate 12, and the opposite side of the injection mold 11 is installed on the machine tool movable plate 13. After installation, the injection molding machine 10 drives the machine tool movable plate 13 to move along the machine tool guide rod 14 towards the machine tool fixed plate 12 until the injection mold 11 closes, forming a closed cavity 20 inside.

[0104] S2: Before injection molding, start the magnetic device 15 of the injection molding machine 10. The magnetic field is emitted from the side of the machine tool fixed plate 12. Since the magnetic conductive component 30 (such as the first magnetic conductive component 32) in the injection mold 11 is closely attached to or magnetically connected to the side of the machine tool fixed plate 12 (or the fixed mold magnetic conductive side plate 34), the magnetic field is successfully introduced into the interior of the injection mold 11.

[0105] S3: A closed magnetic circuit is established through the magnetically conductive component 30 and the non-magnetically conductive component 31 within the injection mold 11, allowing the magnetic field to concentrate and pass through the cavity 20 region. After the magnetic field is introduced, according to the structural design of the system of this invention, the magnetic circuit will travel along a preset path. Specifically, after the magnetic field enters the injection mold 11, it is guided by the first magnetically conductive component 32 and simultaneously isolated and restricted by the surrounding non-magnetically conductive components 31, thus concentrating and passing through the cavity 20. After passing through the cavity 20, the magnetic field is received by the second magnetically conductive component 33 on the other side and conducted to the machine tool movable plate 13, and then the magnetic field enters the machine tool guide rod 14. The machine tool guide rod 14 serves as a return path, guiding the magnetic field back to the machine tool fixed plate 12, thereby forming a complete closed magnetic circuit loop.

[0106] S4: Molten material is injected into cavity 20, and molding is completed under the action of the magnetic field of injection mold 11. After the closed magnetic circuit described in step S3 is stably established, the injection molding machine 10 injects the heated molten material into cavity 20 under high pressure. During the material filling, pressure holding and cooling process, the cavity 20 area is always under the action of a high-intensity directional magnetic field, causing the material molecules to orient or crystallize according to the direction of the magnetic field, thus completing the molding of the product.

[0107] S5: After cooling, the injection mold 11 is opened, and the product 70 is ejected through the ejection mechanism 40. The product 70 is cooled and shaped within the cavity 20 by the temperature-controlled cooling module 60. After cooling, the injection molding machine 10 drives the movable plate 13 of the machine tool to retract in the opposite direction along the machine tool guide rod 14, thereby opening the injection mold 11. Subsequently, the ejection mechanism 40 within the injection mold 11 is activated, and the ejector pin 41 moves forward. Because the ejector pin 41 has a non-magnetic section 411 at its end, it can effectively prevent the product 70 from being magnetically attracted to the ejector pin 41, thus smoothly ejecting the molded product 70 from the cavity 20. At this point, a complete injection molding cycle is completed.

[0108] In summary, the magnetic field-assisted injection molding system and method provided by this invention integrates magnetic and non-magnetic components within the injection mold, forming a closed magnetic circuit with the machine tool fixed plate, movable plate, and guide rod of the injection molding machine. This allows magnetic lines of force to concentrate and pass through the cavity area, effectively improving the particle orientation accuracy of the molten material and the consistency of product performance during the molding process. Furthermore, the non-magnetic section design of the ejection mechanism, the lateral core-pulling mechanism, and the annular cooling water channel further solve the problems of difficult demolding, uneven temperature, and lateral molding under magnetic field conditions. This system is compact, easy to operate, and suitable for producing magnetic composite material products or functional plastic parts requiring magnetic field assistance, demonstrating significant industrial application value and economic benefits.

[0109] Other structures of the magnetic field-assisted injection molding system and method described in this invention can be found in the prior art.

[0110] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A magnetic field-assisted injection molding system, characterized in that: Includes an injection molding machine and an injection mold mounted on the injection molding machine; The injection molding machine includes a machine tool fixed plate, a machine tool movable plate, and several machine tool guide rods; The machine tool guide rod connects the machine tool fixed plate and the machine tool movable plate, and the injection mold is located between the machine tool fixed plate and the machine tool movable plate; The injection mold has at least two cavities, each cavity is used to form a corresponding product outline, and the injection mold has a number of magnetic and non-magnetic components inside it. The magnetic components are connected to the fixed plate side or the movable plate side of the machine tool to form a magnetic circuit, and the non-magnetic components are used to isolate adjacent magnetic circuits and prevent short circuits in the magnetic circuits. The magnetically conductive component and the non-magnetically conductive component together define one or more magnetic paths that converge through the cavity.

2. The magnetic field-assisted injection molding system according to claim 1, characterized in that: The magnetic conductive component includes a first magnetic conductive component and a second magnetic conductive component, which are respectively disposed on opposite sides of the cavity.

3. A magnetic field-assisted injection molding system according to any one of claims 1 or 2, characterized in that, The injection mold also includes a fixed mold magnetic guide side plate. The magnetic path is provided by the magnetic force device of the injection molding machine, and the magnetic path includes, in sequence: The input magnetic path is composed of the machine tool fixed plate, the fixed mold magnetic guide side plate and the first magnetic guide component. The first magnetic guide component is configured to guide the magnetic path through the cavity for the first time. The transition magnetic path is composed of the machine tool guide rod, the machine tool movable plate, and the second magnetic guiding component, and is used to conduct magnetic circuit. The second magnetic guiding component is configured to receive the magnetic circuit from the transition magnetic path and guide it to pass through the cavity a second time. The magnetic path is returned to guide the magnetic path that passes through the cavity a second time back to the machine tool guide rod to form a loop of the magnetic path.

4. The magnetic field-assisted injection molding system according to claim 1, characterized in that: The injection mold is provided with an ejector mechanism, which has an ejector pin. The end of the ejector pin is provided with a non-magnetic section made of non-magnetic material. The non-magnetic section is connected to the ejector pin body by welding to reduce magnetic interference at the ejection point.

5. The magnetic field-assisted injection molding system according to claim 1, characterized in that: The injection mold is also provided with a side core pulling mechanism driven by a cylinder, the side core pulling mechanism being configured to perform a side core pulling action in the magnetic field environment; The lateral core-pulling mechanism includes a core-pulling slider and a guide limiting component.

6. The magnetic field-assisted injection molding system according to claim 1, characterized in that: The number of cavities is two, and the two cavities are symmetrically arranged along the width direction of the injection mold. The cavities are aligned with the magnetic path, so that the magnetic path passes through each cavity simultaneously or separately.

7. The magnetic field-assisted injection molding system according to claim 1, characterized in that: The injection mold is equipped with a temperature control and cooling module, which includes cooling water channels arranged in a ring around each cavity, and a sealing ring groove for installing a sealing ring is provided around the cooling water channels.

8. The magnetic field-assisted injection molding system according to claim 7, characterized in that: The cooling water channels are interconnected between the two cavities to form a circulation loop, and the cooling water channels are located within the area surrounded by the sealing ring groove.

9. A magnetic field-assisted injection molding method, implemented based on the magnetic field-assisted injection molding system according to any one of claims 1-8, characterized in that, Includes the following steps: S1: Install the injection mold and control the injection molding machine to close the mold; S2: Activate the magnetic device of the injection molding machine to generate a magnetic field and guide the magnetic field from the side of the machine tool fixing plate into the injection mold; S3: A closed magnetic circuit is established using the machine tool guide rod as part of the magnetic circuit loop; the magnetic field passes through the first magnetic conductive component, the cavity, and the second magnetic conductive component in sequence, and is conducted to the machine tool guide rod via the machine tool movable plate, and flows back to the machine tool fixed plate along the machine tool guide rod; S4: Molten material is injected into the cavity, and pressure is maintained and cooled under the action of the closed magnetic field to complete the product molding; S5: The injection mold is opened, and the non-magnetic section at the end of the ejector pin is used to block the magnetic attraction, and the product is ejected by the ejection mechanism.

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