A split mold core structure of a plastic mold based on diffusion welding

Abstract

The utility model discloses a kind of plastic mould split type mould core structure based on diffusion welding, the mould core structure includes mould core body, mould core body is made of multiple split units, each split unit is fixedly connected as a whole by diffusion welding process, water hole and water channel are all set up on each split unit, wherein water hole is formed by deep hole drilling, water channel is formed by CNC or milling machine, the water hole of adjacent split unit and water channel are interconnected, and cooling water channel that passes through mould core body is formed jointly. Meanwhile, the mould core body is also provided with water throat tooth hole that is communicated with cooling water channel. The application splits cooling water channel into water hole and water channel by split type design, reduces deep hole drilling processing difficulty, avoids the risk of drilling deviation and breaking rubber position, reduces CNC processing time and expense;Compared with 3D printing mould core, processing cycle is shorter, cost is lower, and adapt to large-scale plastic mould production demand.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic molds, and in particular to a split mold core structure for plastic molds based on diffusion welding. Background Technology

[0002] In the field of plastic mold manufacturing, for deep-cavity plastic products, the corresponding mold core top steel is usually thinner. To ensure product molding quality and shorten the molding cycle, cooling water channels need to be designed inside the mold core. In traditional technology, the mold core often adopts an integral structure design, that is, the cooling water channels are directly machined on the integral mold core.

[0003] However, integral mold cores have significant drawbacks: due to the structural limitations of deep-cavity products, the cooling water channels need to be designed with complex paths, resulting in extremely high machining difficulty. Consequently, drilling deviation is prone to occur during deep hole drilling. If the water channel hole penetrates the mold core's adhesive surface, it will directly lead to product scrap. At the same time, the thin-walled areas of the integral mold core are prone to cracking during deep hole drilling due to stress concentration, further increasing the risk of mold scrap. In addition, the complex water channel design relies on a large amount of CNC machining, which not only results in a long machining cycle but also leads to high machining costs.

[0004] In existing technologies, some solutions address the difficulties in water-carrying processing by using 3D printing technology to manufacture mold cores. However, 3D printing technology has significant limitations: on the one hand, the printing cycle is much longer than traditional processing methods, and for large-sized steel mold cores, the stroke of existing 3D printing equipment cannot meet the processing requirements; on the other hand, the cost of 3D printing steel mold cores is extremely high, making it only suitable for manufacturing small parts and difficult to promote its application in the production of large plastic molds. Utility Model Content

[0005] This invention aims to at least partially solve one of the problems in related technologies. Therefore, one objective of this invention is to provide a split mold core structure for plastic molds based on diffusion welding, which solves the problem of cooling water circulation in deep-cavity plastic molds, improves production efficiency, and reduces costs.

[0006] A split mold core structure for plastic molds based on diffusion welding, the split mold core structure for plastic molds based on diffusion welding includes a mold core body, the mold core body is composed of multiple split units, and the split units are fixedly connected to each other as a whole by diffusion welding process; Each of the aforementioned sub-units is provided with water-carrying holes and water-carrying grooves. The water-carrying holes are formed by deep hole drilling, and the water-carrying grooves are formed by CNC or milling. The water-carrying holes and water-carrying grooves of adjacent sub-units are interconnected to form a cooling water channel that runs through the core body. The core body is also provided with a water jet hole that communicates with the cooling water channel. The water jet hole is formed by deep hole drilling after the split units are diffusely welded into a whole.

[0007] Furthermore, the split unit is made of mold steel.

[0008] Furthermore, the diameter of the water-carrying hole is 8-12mm.

[0009] Furthermore, the center-to-center distance between adjacent water passages is 20-30 mm.

[0010] Furthermore, the distance between the wall of the water channel hole and the glue surface of the mold core body is 5-8mm.

[0011] Furthermore, the cross-section of the water channel is U-shaped.

[0012] Furthermore, the width of the water channel is consistent with the diameter of the water channel hole.

[0013] Furthermore, the depth of the water-carrying trough is 1 / 2 to 2 / 3 of the diameter of the water-carrying hole.

[0014] Furthermore, the connection between the water jet hole and the cooling water channel is rounded.

[0015] Furthermore, the number of the subdivided units is 7, and the 7 subdivided units are spliced ​​together in a layered structure of 3, 2, 2, or 4, 2, 1.

[0016] Compared with the prior art, the technical solution provided in this application has the following advantages: This application, through a split design, breaks down the complex overall water channel into multiple split units for simple water channel holes and water channel processing, eliminating the need for complex CNC paths, significantly reducing the difficulty of deep hole drilling, and avoiding the risk of drilling off-center and breaking the glue position; most of the water channel is processed by deep hole drilling, and only some parts are processed by CNC / milling machines for water channels, reducing CNC processing time and costs; compared with 3D printing, the processing cycle is shortened and the cost is reduced; the overall structural strength formed by diffusion welding is comparable to that of the overall mold core, and the annealing treatment eliminates welding stress, avoiding the problem of long-term use cracking caused by thin-wall processing of the overall mold core, thus extending the mold life; the split design makes the water channel closer to the glue position surface and more uniformly distributed, improving cooling efficiency, shortening the molding cycle, reducing product deformation defects caused by uneven cooling, and significantly improving the yield rate. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the present invention.

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] In the attached image: Figure 1 This is a schematic diagram of an embodiment of the split mold core structure for plastic molds based on diffusion welding according to this application; Figure 2 This is a schematic diagram of another perspective of an embodiment of the split mold core structure of plastic mold based on diffusion welding in this application.

[0020] Figure 3 This is a schematic diagram of the combination of multiple separate units in the split mold core structure of the plastic mold based on diffusion welding in this application.

[0021] Figure label: 10. Mold core body; 11. Separate unit; 111. Water channel hole; 112. Water channel groove; 113. Water channel tooth hole. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0024] like Figure 1 - Figure 3 As shown, this application provides a split mold core structure for plastic molds based on diffusion welding, including a mold core body 10, which is composed of multiple split units 11, and the split units 11 are fixedly connected to each other as a whole by diffusion welding process. Each of the aforementioned sub-units 11 is provided with a water-carrying hole 111 and a water-carrying groove 112. The water-carrying hole 111 is formed by deep hole drilling, and the water-carrying groove 112 is formed by CNC or milling machine. The water-carrying holes 111 and water-carrying grooves 112 of adjacent sub-units 11 are interconnected to form a cooling water channel that penetrates the core body 10. The core body 10 is also provided with a water jet hole 113 that communicates with the cooling water channel. The water jet hole 113 is formed by deep hole drilling after the split unit 11 is diffusely welded into a whole.

[0025] In this embodiment, the mold core body 10 is composed of multiple sub-units 11, which are fixedly connected as a whole by diffusion welding. Each sub-unit 11 is provided with a water channel 111 and a water channel 112. The water channel 111 is formed by deep hole drilling, and the water channel 112 is formed by CNC or milling. The water channel 111 and water channel 112 of adjacent sub-units 11 are interconnected to form a cooling water channel that runs through the mold core body 10. The mold core body 10 is also provided with a water channel tooth hole 113 that communicates with the cooling water channel. The water channel tooth hole 113 is formed by deep hole drilling after the sub-units 11 are diffusely welded into a whole.

[0026] From the perspective of processing feasibility, when machining complex water channels in traditional integral mold cores, deep hole drilling needs to deal with complex paths, which is prone to drilling deviation. If the surface of the glue is drilled through, the product will be scrapped. However, the split design makes the machining path of the water channel 111 and water channel 112 of each split unit 11 simple, the deep hole drilling operation is easier to control, and the CNC or milling machine machining of the water channel 112 does not require complex programming, which significantly reduces the machining error rate and improves the success rate of mold core machining.

[0027] In terms of processing efficiency and cost, traditional integral mold cores rely on extensive CNC machining of complex channels, resulting in long processing cycles and high costs. While 3D printing can solve some processing challenges, its cycle time is even longer, and the processing of large mold cores is limited and extremely expensive. This structure, on the other hand, uses deep hole drilling for most of the water channels, with only localized CNC or milling machines used. This reduces the workload and time required for CNC machining, significantly shortening the processing cycle and reducing costs compared to 3D printing, making it more suitable for the production of large plastic molds.

[0028] In terms of structural strength and service life, the overall structural strength formed by diffusion welding is comparable to that of the integral mold core. Furthermore, welding stress can be eliminated through subsequent annealing treatment, which avoids the problem of long-term cracking caused by stress concentration during the thin-walled processing of the integral mold core, thus extending the service life of the mold.

[0029] In terms of product quality, the split design allows the water channels to be closer to the glue surface and more evenly distributed, significantly improving cooling efficiency and shortening the product molding cycle. At the same time, uniform cooling avoids deformation defects caused by uneven cooling, significantly improving the product yield.

[0030] This utility model also discloses the processing technology of the above-mentioned split mold core structure, and the specific steps are as follows: Machining of split unit 11: The overall mold core design is divided into multiple split units 11. Water channels 111 are machined on each split unit 11 using a deep hole drill. Water channels 112 connected to the water channels 111 are machined using CNC or milling machine. Diffusion welding assembly: The processed multiple split units 11 are assembled in preset positions and sent into diffusion welding equipment. Diffusion welding is carried out under preset temperature and pressure to connect the split units 11 into an integral mold core blank. Annealing and fine grinding: The entire mold core blank is annealed to eliminate welding stress, and then the surface of the mold core blank is processed by fine grinding to ensure surface flatness; Throat hole machining: After checking the right angle accuracy of the mold core blank, a deep hole drill is used to machine the water throat hole 113 on the mold core body 10, which is connected to the cooling water channel; CNC precision machining: The mold core body 10 is precision machined by CNC to form the mold core rubber surface and other assembly structures, thus completing the mold core manufacturing.

[0031] Furthermore, the split unit 11 is made of mold steel.

[0032] Mold steel possesses excellent machinability, readily adapting to processes such as deep-hole drilling for water channels 111 and CNC or milling for water channels 112. During the machining of the split unit 11, its superior machinability reduces tool wear, lowers machining difficulty, and ensures the machining accuracy of the water channels 111 and 112. This guarantees precise communication between the water channels 111 and 112 of adjacent split units 11, forming an effective cooling water channel. This avoids problems such as blockage or leakage in the cooling channel due to insufficient machining accuracy, ensuring the normal operation of the cooling system. Furthermore, mold steel exhibits excellent thermal stability, maintaining stable performance even in the high-temperature environment of plastic molding and resisting deformation due to temperature changes. The stability of the mold core ensures that the product remains precisely within the mold cavity during molding, guaranteeing dimensional accuracy and surface flatness. This prevents dimensional deviations and surface defects caused by mold core deformation, improving product quality stability and consistency, and meeting the production requirements of plastic products.

[0033] Furthermore, the diameter of the water-carrying hole 111 is 8-12mm.

[0034] A suitable orifice diameter ensures sufficient water flow and appropriate velocity within the cooling water channels. During the molding process of plastic products, ample cooling water can quickly remove heat from the mold core and the product, shortening the cooling time and thus the molding cycle, improving production efficiency. Simultaneously, an appropriate flow velocity prevents cooling water from stagnating within the channels, ensuring that heat is continuously and evenly removed, preventing defects such as shrinkage marks and deformation due to insufficient localized cooling, and guaranteeing product quality. Furthermore, this orifice diameter range does not excessively occupy the internal space of the mold core, effectively preserving the effective load-bearing area of ​​the mold core and ensuring sufficient structural strength to withstand the high temperatures and pressures of plastic molding. If the orifice diameter is too large, excessive removal of steel from the mold core can lead to reduced localized strength, making it prone to cracking and deformation during use, affecting the mold's lifespan. This orifice diameter design, however, meets cooling requirements while ensuring the structural stability of the mold core, extending the mold's lifespan. Moreover, this aperture range aligns with the conventional machining capabilities of deep hole drills. When machining the water passage 111 with this aperture, deep hole drills can more easily control machining accuracy, reducing machining defects such as drill deviation and rough hole walls. Reducing machining defects not only ensures the unobstructed flow of the water passage 111, avoiding problems such as scale buildup and channel blockage caused by rough hole walls, but also lowers the scrap rate during machining, improves machining efficiency, and reduces production costs.

[0035] Furthermore, the center-to-center distance between adjacent water passages 111 is 20-30 mm.

[0036] From the perspective of cooling uniformity, a reasonable center-to-center spacing allows the cooling water channels to be evenly distributed within the mold core, ensuring that all areas of the mold core receive sufficient and uniform cooling. During the molding process of plastic products, if the spacing between adjacent water channels is too large, the heat in the middle area of ​​the mold core cannot be dissipated in time, easily leading to localized overheating. This results in slow cooling of the corresponding areas of the product, causing deformation defects such as shrinkage marks and warping. This spacing design allows the cooling effect of the cooling water to cover every area of ​​the mold core, keeping the overall temperature of the mold core uniform, avoiding quality problems caused by uneven cooling, and improving the product yield.

[0037] From the perspective of mold core structural strength, this spacing range ensures the number of cooling channels while preventing the water channels 111 from being too densely packed, which would lead to excessive reduction of steel inside the mold core. If the spacing between adjacent water channels 111 is too small, the steel thickness between adjacent holes inside the mold core will be insufficient, which will easily lead to stress concentration under high temperature and pressure, causing the mold core to crack and be damaged, affecting the service life of the mold. This spacing design can retain sufficient steel thickness to ensure that the mold core has good structural strength and load-bearing capacity, maintain stable performance during long-term use, reduce the occurrence of mold failures, and reduce maintenance costs and downtime during production.

[0038] Furthermore, the distance between the wall of the water channel hole 111 and the glue surface of the mold core body 10 is 5-8mm.

[0039] From a cooling efficiency perspective, this distance allows the water channel hole 111 to be closer to the plastic surface, enabling the cooling water to more quickly and directly remove heat from the plastic surface and the product. During the molding process of plastic products, the plastic surface is in direct contact with the high-temperature molten plastic, requiring timely heat dissipation to ensure rapid solidification. The proximity of the water channel hole 111 to the plastic surface shortens the heat transfer path, improves heat exchange efficiency, accelerates product cooling, shortens the molding cycle, and increases production efficiency. Simultaneously, rapid cooling reduces the flow time of the plastic in the mold cavity, avoiding problems such as uneven internal structure caused by excessive flow, thus improving the product's intrinsic quality.

[0040] From the perspective of surface stability, this distance will not excessively weaken the structural strength of the surface. During molding, the surface must withstand the pressure of the molten plastic. If the water channel 111 is too close to the surface, and the steel thickness at the surface is too thin, it is prone to deformation and dents under pressure, leading to surface defects and reduced dimensional accuracy. This distance design ensures sufficient steel thickness at the surface, guaranteeing good structural strength and rigidity, maintaining a stable shape and dimensions under pressure, ensuring a smooth product surface, meeting accuracy standards, reducing product scrap due to surface deformation, and improving product yield.

[0041] Furthermore, the cross-section of the water tank 112 is U-shaped.

[0042] From the perspective of water flow smoothness, the inner wall of the U-shaped water channel 112 is smooth and has a gentle transition, without sharp edges or complex corners, which can effectively reduce the resistance of cooling water during the flow process. When the cooling water flows through the water channel 112 and connects with adjacent water holes 111, the smooth water flow can ensure a stable flow rate and velocity, avoiding problems such as insufficient or uneven cooling caused by water flow obstruction. The stable cooling water flow can make the heat dissipation effect of the entire cooling water channel more uniform, ensuring that the temperature of each area of ​​the mold core is consistent, thereby ensuring uniform cooling of the product during the molding process, reducing defects such as deformation and shrinkage cavities caused by cooling differences, and improving the quality stability of the product.

[0043] From a processing convenience perspective, the U-shaped water channel 112 is easily formed by CNC or milling machines. When machining the U-shaped channel, CNC and milling machines offer simple toolpaths, requiring no complex programming or operation, enabling rapid and precise machining of the water channel 112 to meet dimensional requirements. This simplicity reduces machining time and improves efficiency, while minimizing errors caused by complex machining operations, ensuring the dimensional accuracy and surface quality of the water channel 112. Precise dimensions of the water channel 112 ensure accurate alignment with the water holes 111 of adjacent sub-units 11, preventing leaks or poor water flow due to misalignment and guaranteeing the normal operation of the cooling system.

[0044] Furthermore, the width of the water channel 112 is consistent with the diameter of the water channel hole 111.

[0045] From the perspective of water flow continuity, the width of the water channel 112 is consistent with the diameter of the water channel 111. This ensures that the cross-sectional area of ​​the cooling water remains constant as it flows from the water channel 111 into the water channel 112 and then from the water channel 112 into another water channel 111. This avoids water vortices or increased resistance caused by abrupt changes in cross-section. Stable water flow ensures the uniformity of flow rate and velocity within the cooling water channel, guaranteeing that the cooling water can continuously and efficiently remove heat from the mold core, avoiding localized insufficient or excessive cooling caused by unstable water flow. Uniform cooling allows for stable temperature changes during the molding process, reducing internal stress caused by temperature fluctuations, preventing defects such as cracking and deformation, and improving the structural stability and service life of the product.

[0046] From the perspective of channel sealing, the water channel 112 and water channel hole 111, which are of the same size, can achieve a tighter fit when connected, reducing the gap between them. During diffusion welding, the tight fit helps to form a stronger, sealed connection in the welding area, preventing cooling water leakage at the channel connection. Leakage not only reduces the amount of cooling water and lowers cooling efficiency, but may also damage other parts of the mold, affecting the normal use of the mold. Good sealing performance ensures the normal operation of the cooling system, guarantees the cooling effect of the mold core, reduces mold failures and maintenance costs caused by leakage, and improves the continuity and stability of production.

[0047] Furthermore, the depth of the water channel 112 is 1 / 2 to 2 / 3 of the diameter of the water channel hole 111.

[0048] From a cooling effect perspective, the depth of the channel ensures that the water channel 112 has a sufficient cross-sectional area for water flow, forming a smooth cooling water channel in conjunction with the water channel holes 111. This ample cross-sectional area reduces the flow resistance of the cooling water within the water channel 112, ensuring a stable flow rate and velocity, thereby efficiently removing heat from the mold core. During the molding process of plastic products, efficient cooling can quickly reduce the temperature of the mold core and the product, shorten the molding cycle, and improve production efficiency. Simultaneously, a stable water flow ensures uniform cooling, avoiding uneven cooling caused by insufficient local water flow, reducing defects such as product deformation and shrinkage marks, and improving product quality.

[0049] From a manufacturing feasibility perspective, this groove depth is easily achievable using CNC or milling machines. When machining grooves of this depth using CNC and milling machines, the tool experiences more even force, resulting in a more stable machining process. This effectively reduces tool wear, minimizes machining errors, and ensures the dimensional accuracy and surface quality of the water channel 112. A precise groove depth ensures accurate alignment between the water channel 112 and the water channels 111 of adjacent sub-units 11, avoiding problems such as poor water flow or excessive gaps caused by improper groove depth, thus improving the reliability of the cooling water channel. Simultaneously, the simplified machining process shortens machining time, increases machining efficiency, and reduces production costs.

[0050] Furthermore, the connection between the water jet hole 113 and the cooling water channel is rounded.

[0051] From the perspective of water flow resistance, the rounded joints provide a smooth transition without sharp corners, effectively reducing local resistance during cooling water flow. As cooling water flows into the cooling water channel from the water throat orifice 113, the smooth transition prevents eddies or turbulence, ensuring a stable flow rate and velocity. This stable flow allows for more uniform and efficient heat dissipation from the cooling water channel, quickly removing heat from the mold core, shortening the product molding cycle, and improving production efficiency. Simultaneously, reducing water flow resistance lowers the energy consumption of the cooling system, reducing energy waste and meeting the demands of energy-saving and environmentally friendly production.

[0052] From the perspective of channel wear and lifespan, sharp corners are prone to stress concentration under long-term water flow impact, leading to wear and corrosion on the channel walls. Prolonged use may result in channel breakage and leakage, affecting the normal operation of the cooling system and the lifespan of the mold core. Rounding the corners ensures a more uniform impact of water flow on the channel walls, avoiding localized stress concentration, reducing the risk of wear and corrosion, and extending the lifespan of the cooling water channels. Extended channel lifespan reduces the frequency of mold core repair or replacement, lowers production costs, and ensures production continuity.

[0053] Furthermore, the number of the split units 11 is 7, and the 7 split units 11 are spliced ​​together in a layered structure of 3, 2, 2 or 4, 2, 1.

[0054] From a processing convenience perspective, the number of seven separate units 11 and the layered assembly structure allow the complex mold core to be broken down into individual units of moderate size and relatively simple structure. Each separate unit 11 is smaller in size, making it easier to perform operations such as deep hole drilling for water channels 111 and CNC or milling for water channels 112. Operators can more precisely control the processing and reduce processing errors. At the same time, the layered assembly structure (e.g., 3, 2, 2 or 4, 2, 1) ensures a certain consistency in the machining tools used for each layer of separate units 11, allowing for the use of similar processing techniques and parameters, simplifying the processing flow and improving processing efficiency. For example, separate units 11 in the same layer can be batch-processed with the same water channels 111 or water channels 112, reducing process changeover time and lowering production costs.

[0055] From the perspective of cooling channel layout, a reasonable layered splicing structure allows for a more flexible and uniform arrangement of cooling water channels within the mold core. The seven separate units 11 can be designed with varying positions and numbers of water channels 111 and water grooves 112 according to the cooling needs of different areas of the mold core. These are then connected through layered splicing to form a cooling network covering the entire mold core. This layout ensures that different parts of the mold core, such as deep cavity areas and thin-walled areas, receive sufficient cooling, avoiding product quality issues caused by localized cooling blind spots. For example, for the separate unit 11 in the deep cavity area, a denser arrangement of water channels 111 can be designed to enhance the cooling effect and ensure the molding quality of the product in that area.

[0056] It is understood that the above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present utility model patent. It should be noted that for those skilled in the art, the above technical features can be freely combined, and several modifications and improvements can be made without departing from the concept of the present utility model, all of which fall within the protection scope of the present utility model. Therefore, all equivalent transformations and modifications made within the scope of the claims of the present utility model should fall within the coverage of the claims of the present utility model.

Claims

1. A split-type mold core structure for plastic molds based on diffusion welding, characterized in that, Includes a mold core body, which is composed of multiple separate units, and the separate units are fixedly connected into a whole by diffusion welding process; Each of the aforementioned sub-units is provided with water-carrying holes and water-carrying grooves. The water-carrying holes are formed by deep hole drilling, and the water-carrying grooves are formed by CNC or milling. The water-carrying holes and water-carrying grooves of adjacent sub-units are interconnected to form a cooling water channel that runs through the core body. The core body is also provided with a water jet hole that communicates with the cooling water channel. The water jet hole is formed by deep hole drilling after the split units are diffusely welded into a whole.

2. The split mold core structure for plastic molds based on diffusion welding according to claim 1, characterized in that, The split unit is made of mold steel.

3. The split mold core structure for plastic molds based on diffusion welding according to claim 1, characterized in that, The diameter of the water-carrying hole is 8-12mm.

4. The split mold core structure for plastic molds based on diffusion welding according to claim 1, characterized in that, The center-to-center distance between adjacent water passages is 20-30 mm.

5. A split-type mold core structure for plastic molds based on diffusion welding according to claim 1, characterized in that, The distance between the wall of the water channel hole and the glue surface of the mold core body is 5-8mm.

6. The split mold core structure for plastic molds based on diffusion welding according to claim 1, characterized in that, The water channel has a U-shaped cross-section.

7. A split-type mold core structure for plastic molds based on diffusion welding according to claim 1, characterized in that, The width of the water channel is the same as the diameter of the water channel hole.

8. A split-type mold core structure for plastic molds based on diffusion welding according to claim 1, characterized in that, The depth of the water channel is 1 / 2 to 2 / 3 of the diameter of the water channel hole.

9. A split mold core structure for plastic molds based on diffusion welding according to claim 1, characterized in that, The connection between the water jet hole and the cooling water channel is rounded.

10. A split-type mold core structure for plastic molds based on diffusion welding according to claim 1, characterized in that, The number of the sub-units is 7, and the 7 sub-units are spliced ​​together in a layered structure of 3, 2, 2, or 4, 2, 1.

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