Thimble structure for 3D printing

Abstract

The utility model discloses a 3D printing ejector pin structure which comprises a base and an exhaust ejector pin connected to one end of the base, and the base is provided with an exhaust channel. The exhaust ejector pin comprises an ejector pin body, a lattice structure and an exhaust structure, the lattice structure is supported in the ejector pin body, and the exhaust structure is located at the end, away from the base, of the lattice structure; a plurality of hole channels are formed in the exhaust structure, and the hole channels in the exhaust structure are communicated with the exhaust channel through gaps in the lattice structure. When a product is subjected to injection molding in the molding cavity of the injection mold, one end of the ejector pin structure extends into the molding cavity, and air in the molding cavity is exhausted outwards through the exhaust ejector pin, so that air is effectively prevented from being accumulated in the mold, the air in the molding cavity of the mold is efficiently and accurately exhausted, and the appearance defect of the product caused by local air trapping is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of mold design, in particular to a 3D printed ejector pin structure. Background Art

[0002] As product precision requirements become higher and higher, the transformation of manufacturing industry has improved product precision to a certain extent. However, in actual processing, due to the increasing restrictions on product structure, the manufacturing industry has shifted from extensive to high-precision technology, and structural design has become more rational. Mold technology is the mother of industry. Good products and good design concepts also need good technology to support them.

[0003] At present, the injection molding mold is in liquid state after the plastic is melted. The plastic is injected into the mold core of the mold by the injection molding machine under high pressure. At the moment of injection, shear heat is generated, and the gas generated during fusion is brought into the gate when the material is fed. Due to the limitation of the mold structure, it is impossible to achieve efficient and accurate discharge of the gas in the mold cavity, which leads to the problem of product joint line deviation, and causes the problem of product bright spots and solar rings, affecting the appearance and use.

[0004] In the existing injection molding mold production process, the above problems are mainly caused by the position limitation of the injection port of the injection molding machine and the characteristic limitation of the product structure. In order to solve the above problems, the exhaust position and product structure are the first issues that need to be considered in the early design stage. Whether the exhaust effect is normal will directly affect whether the appearance of the injection molded product meets the design requirements.

[0005] In the traditional mold structure, exhaust is done by traditional machining on the molding rubber surface, and exhaust grooves are formed by partially lowering the parting surface by -0.03mm below the normal surface to meet the exhaust requirements. However, in practical applications, the setting of this structure has certain limitations. When the mold structure is extremely complex, the position of the exhaust groove will be restricted, and the exhaust groove will not be able to be opened, resulting in the problem of local air entrapment.

[0006] In traditional injection molding molds, there are also solutions for setting exhaust holes on pin-embedded structures or inlaid blocks. However, the processing technology for processing exhaust holes on pin-embedded structures or inlaid blocks is cumbersome and complicated, and requires multiple steps to cooperate with each other to achieve processing. In addition, the work efficiency and exhaust efficiency are affected by the size and cannot be controlled. At the same time, traditional machining technology is limited by the work experience and operating skills of technicians. Because both structures require the operating skills of technicians as a foundation, it is extremely easy to be affected by the operating technology, resulting in failure to meet product design requirements, thereby causing product defects or processing failures. Utility Model Content

[0007] In view of the problem in the prior art that mold exhaust is limited by traditional machining technology and mainly relies on manual technology, the utility model provides a 3D printed ejector pin structure. The structure of the utility model is not limited by the diameter of the mold ejector pin, and can be directly printed from one end of the exhaust ejector pin to the other end through 3D printing, and achieves instantaneous exhaust effect by connecting with the exhaust channel of the base.

[0008] In order to solve the above technical problems, the technical solution of the utility model is as follows:

[0009] A 3D printed ejector pin structure comprises a base and an exhaust ejector pin connected to one end of the base, wherein the base is provided with an exhaust channel; the exhaust ejector pin comprises an ejector pin body, a lattice structure and an exhaust structure, wherein the lattice structure is supported inside the ejector pin body, and the exhaust structure is located at one end of the lattice structure away from the base; a plurality of channels are provided on the exhaust structure, and the channels on the exhaust structure and the exhaust channel are connected through gaps inside the lattice structure.

[0010] Furthermore, the ejector body, the lattice structure and the exhaust structure are an integrated structure of 3D printing.

[0011] Further, the base is a limiting cap, the exhaust passage is a connecting through hole arranged in the limiting cap, and the connecting through hole is also used for connecting the limiting cap and an external component.

[0012] Furthermore, the base includes a limiting cap and a grafting base, the limiting cap, the grafting base and the exhaust ejector structure are connected in sequence, and the exhaust channel is an exhaust hole arranged on the wall of one end where the grafting base is connected to the ejector body.

[0013] Furthermore, the lattice structure is a three-dimensional space lattice structure in a lattice shape.

[0014] Furthermore, the length of the ejector body ranges from 20 to 450 mm, and the diameter of the ejector body ranges from 3 to 100 mm.

[0015] Furthermore, the diameter of the connecting strips in the lattice structure ranges from 0.5 to 5 mm.

[0016] Furthermore, the holes in the exhaust structure are arranged along the axial direction of the ejector structure, the hole diameter ranges from 0.02-0.6 mm, the hole spacing ranges from 0.1-0.5 mm, and the thickness range of the exhaust structure in the axial direction of the ejector structure is from 0.5-40 mm.

[0017] Compared with the prior art, the utility model has the following beneficial technical effects:

[0018] 1. The utility model provides a 3D printed ejector pin structure, which ensures the exhaust ejector pin support strength and the quality of the ejector pin structure through the lattice structure arranged in the ejector pin body, and ensures the exhaust effect of the ejector pin structure through the gaps inside the exhaust structure and the lattice structure; the ejector pin structure provided by the utility model has the advantages of structural integrity, high exhaust efficiency and strong manufacturing flexibility, can effectively improve the quality of injection molded products, and improve the actual production efficiency of the injection molding machine by reducing the scrap rate. At the same time, through the lattice structure and the exhaust structure at the end, the circulation of gas in the ejector pin structure is further guaranteed, so that the gas can be discharged instantly to ensure work efficiency.

[0019] 2. The utility model provides a 3D printed ejector pin structure, in which the ejector pin body, lattice structure and exhaust structure are made by 3D printing, thereby ensuring the integrity and stability of the ejector pin structure.

[0020] 3. The utility model provides a 3D printed ejector pin structure, in which a limiting cap is adopted for the base. The limiting cap is provided to realize a stable limiting connection with the processing structure, thereby ensuring the connection reliability of the device. At the same time, an assembly connection with external components is realized through a connecting through hole, thereby achieving an exhaust effect and efficiently releasing the gas inside the mold.

[0021] 4. The utility model provides a 3D printed ejector pin structure, wherein the base comprises a limiting cap and a grafting base. The setting of the grafting base can reduce the length of the ejector pin body. Since the structural strength of the grafting base is relatively high, the overall structural strength of the ejector pin structure can be improved, thereby preventing the ejector pin structure from breaking due to excessive force during use, thereby increasing the service life of the ejector pin structure. At the same time, the grafting base can reduce the printing length of the exhaust ejector pin, thereby reducing the manufacturing difficulty and production cost.

[0022] 5. The utility model provides a 3D printed ejector pin structure, wherein the lattice structure is a lattice-like three-dimensional space lattice structure, and the internal reinforcement of the ejector pin body is achieved through the lattice-like three-dimensional space lattice structure of the lattice structure, and the one-piece molding setting further ensures the uniform and stable strength requirements of the ejector pin structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A sectional view of a front view of a 3D printed ejector pin structure provided by an embodiment of the utility model;

[0025] Figure 2 A sectional view of a front view of a 3D printed ejector pin structure provided by another embodiment of the utility model;

[0026] Figure 3 A partially enlarged front cross-sectional view of an exhaust ejector structure of a 3D printed ejector structure provided by an embodiment of the utility model;

[0027] Figure 4 A schematic diagram of the channel structure of an exhaust ejector pin of a 3D printed ejector pin structure provided in an embodiment of the utility model;

[0028] Figure 5 A schematic diagram of the hole structure of an exhaust ejector pin of a 3D printed ejector pin structure provided in another embodiment of the utility model.

[0029] Explanation of the accompanying drawings: 1. Limiting cap; 2. Grafting base; 3. Exhaust hole; 4. Ejector body; 5. Dot matrix structure; 7. Exhaust structure; 8. Connecting through hole; 9. Second substrate clamp; 10. First substrate clamp; 11. Bottom fixing screw; 12. V-shaped groove; 13. Clamp fixing screw; 14. Printing device substrate; 15. Channel; a. Length of ejector body; b. Thickness of limiting cap step; c. Thickness of exhaust structure in the axial direction of ejector structure; d: Diameter of exhaust structure; e: Diameter of ejector body; h: Diameter of lattice structure; θ: Bevel angle between exhaust structure and lattice structure. DETAILED DESCRIPTION

[0030] The technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all of the embodiments. As those skilled in the art can appreciate, the described embodiments can be modified in various ways without departing from the spirit or scope of the utility model. Therefore, the drawings and descriptions are considered to be illustrative in nature and not restrictive.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0032] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0034] The present embodiment provides a 3D printed ejector pin structure, which is used to extend into a molding cavity of an injection mold. The gas generated in the molding cavity is discharged out of the molding cavity of the injection mold through the 3D printed ejector pin structure to reduce the impact of the gas on the appearance quality of the molded product in the injection mold.

[0035] In the first implementation of this embodiment, Figure 1 As shown, the ejector structure includes an ejector body 4, a limiting cap 1, a lattice structure 5, and an exhaust structure 7. The ejector body 4 is in the shape of a long column, the lattice structure 5 is located inside the ejector body 4 and is integrally 3D printed with the ejector body 4; the limiting cap 1 is connected to one end of the ejector body 4, and the exhaust structure 7 is connected to the other end of the ejector body 4.

[0036] A connecting through hole 8 is provided in the limiting cap 1, and the connecting through hole 8 is specifically a threaded hole. The limiting cap 1 is assembled on the external component by a screw threadedly connected to the connecting through hole 8. A plurality of channels are provided on the exhaust structure 7, and the channels on the exhaust structure 7 and the connecting through hole 8 are connected through the gap inside the lattice structure 5. When the product is injection molded in the molding cavity of the injection mold, one end of the ejector structure extends into the molding cavity, and the air in the molding cavity flows to the gap in the lattice structure 5 through the channel on the exhaust structure 7, and finally is discharged to the outside through the connecting through hole 8, thereby realizing efficient and accurate discharge of the air in the molding cavity of the mold, and reducing the appearance defects of the product caused by local trapped air.

[0037] Among them, the lattice structure 5 is specifically a three-dimensional space lattice structure in the shape of a lattice. The lattice structure 5 is supported inside the ejector body 4 to ensure that the ejector body 4 has both high structural strength and high porosity, achieving a good exhaust effect. The ejector body 4, the lattice structure 5 and the exhaust structure 7 are an integrated structure of 3D printing; the exhaust ejector is manufactured by 3D printing, which has the advantages of light weight, high production efficiency and low cost; moreover, the design diameter of the exhaust ejector is not limited by the range of size, and the minimum diameter can be 2mm. The internal structure can be optimized as the diameter size increases, which not only ensures the exhaust effect, but also takes into account the rigidity of the structure and the efficiency of printing.

[0038] In some embodiments, the limiting cap 1 is a cylindrical step piece, the minimum wall thickness of the limiting cap 1 is greater than or equal to the minimum wall thickness of the ejector body 4, and the limiting cap step thickness b ranges from 0 to 30 mm, thereby ensuring a stable connection of the ejector structure.

[0039] The length direction of the multiple channels on the exhaust structure 7 is the same as the length direction of the exhaust ejector pin. The aperture of the channel 15 is 0.02-0.6mm, and the hole distance between two adjacent channels is 0.1-0.5mm. The thickness c of the exhaust structure in the axial direction of the ejector pin structure is 0.5mm; the length a of the ejector pin body ranges from 20-250mm, and the wall thickness of the ejector pin body 4 is 2mm. It can be understood here that the ejector pin structure in the embodiment of the utility model can select an exhaust structure 7 with a suitable aperture according to different needs. The design diameter of the utility model is not limited by the range of sizes, and the minimum diameter can be 2mm. On this basis, the exhaust structure 7 is connected to ensure that the exhaust efficiency matches the material properties and solve the problem of defective products caused by gas retention during the injection molding process.

[0040] In this embodiment, the lattice structure 5 is composed of a plurality of connecting strips, and the minimum diameter of the connecting strips in the lattice structure 5 is 0.5 mm and the maximum is 5 mm, which further ensures the stability of the lattice structure inside the ejector structure, effectively controls the quality of the lattice structure 5 by limiting the size, and ensures the strength to the maximum extent while ensuring the lightness of the ejector structure. In addition, by limiting the aperture size of the exhaust structure 7, the overflow and blockage problems in the actual processing process are effectively prevented, and the exhaust effect of the exhaust structure 7 is further ensured. At the same time, the exhaust ejector part provided by the utility model is made of martensitic stainless steel, which ensures the strength and rigidity requirements under the premise of ensuring the normal use of the ejector.

[0041] In the second implementation of this embodiment, Figure 2 As shown, the difference from the first embodiment is that a grafting base 2 is provided between the ejector body 4 and the limiting cap 1, and the limiting cap 1, the grafting base 2 and the exhaust ejector are sequentially connected to form an exhaust hole 3 on the wall of one end where the grafting base 2 is connected to the ejector body 4, and the exhaust hole 3 is arranged along the radial direction of the grafting base 2. The air in the molding cavity of the injection mold flows to the gap in the lattice structure 5 through the channel on the exhaust structure 7, and is finally discharged outward through the exhaust hole 3.

[0042] In this embodiment, the limiting cap 1 and the grafting base can be processed and set up by an integrated machine. The setting of the grafting base 2 can, on the one hand, reduce the length of the exhaust pin that needs to be printed and reduce the printing cost. On the other hand, the grafting base 2 is a solid structure, which can improve the overall rigidity of the pin structure and avoid damage to the pin structure.

[0043] Specifically, a plurality of exhaust holes 3 are provided, for example, two exhaust holes 3 are provided, and the provision of two exhaust holes 3 ensures efficient exhaustion of gas.

[0044] Specific reference Figure 3 As shown, when printing the exhaust ejector pin on such a grafting base 2, it is necessary to first fix the grafting base 2 with a clamp, the clamp includes a printing device substrate 10, a first substrate clamp 8 and a second substrate clamp 9, the second substrate clamp 9 is fixed to the printing device substrate 10 by a bottom fixing screw 11, and the first substrate clamp 8 is fixed to one side of the second substrate clamp 9 by a clamp fixing screw 13. The first substrate clamp 8 and the second substrate clamp 9 enclose a V-shaped groove 12, and the grafting base 2 is located in the V-shaped groove 12 and is clamped and fixed by the first substrate clamp 8 and the second substrate clamp 9.

[0045] Specifically, the first substrate clamp 8 and the second substrate clamp 9 enclose a plurality of V-shaped grooves 12, and a grafting base 2 can be fixed in each V-shaped groove 12, so that the 3D printing device can print exhaust pins on multiple grafting bases 2 at the same time, thereby improving printing efficiency.

[0046] The ejector structure provided by the utility model determines the printing parameters of the ejector body 4 and the lattice structure 5 and the printing parameters of the exhaust structure 7 in the 3D printer according to the size and shape of the ejector body 4, the lattice structure 5 and the exhaust structure 7 in the exhaust ejector to be processed.

[0047] Among them, the printing parameters of the ejector body 4 and the dot matrix structure 5 are: laser power of 80-380W, scanning spacing of 0.02-0.12mm, scanning speed of 450-1500mm / s, printing layer thickness of 0.025-0.08mm, scanning rotation angle of 47-113°, and scanning width of 8-20mm; the printing parameters of the exhaust structure 7 are: laser power of 80-250W, scanning spacing of 0.1-0.15mm, scanning speed of 450-1500mm / s, printing layer thickness of 0.025-0.08mm, scanning rotation angle of 45-90°, and scanning width of 20-100mm.

[0048] According to the printing parameters of the ejector body 4 and the lattice structure 5, as well as the printing parameters of the exhaust structure 7, the model of the ejector structure is printed and laid out through 3D printing slicing software. At the same time, the corresponding process parameters are separately set for the ejector body 4, the lattice structure 5, and the exhaust structure 7 of the ejector structure, and the sliced ​​printing data is transmitted to the 3D printing device; the 3D printing device prints and forms the exhaust ejector on the limiting cap 1 or the grafting base 2.

[0049] The utility model can flexibly select 3D printing methods according to actual needs to adapt to different mold design requirements and cost considerations. By adjusting the printing molding parameters, the microporous exhaust structure and porosity inside the ejector pin can be optimized according to the melt index of different injection molding materials to ensure that the exhaust efficiency matches the material properties; and solve the problem of defective products caused by gas retention during the injection molding process. The use of 3D printing takes into account structural integrity, exhaust efficiency and manufacturing flexibility, which helps to improve the quality and production efficiency of injection molding products.

[0050] In this embodiment, the heating temperature of the printing device substrate 10 is 80° C., the powder spreading speed is 50 mm / s, the protective gas is argon, and the 3D printing material is martensitic stainless steel.

[0051] In this embodiment, the lattice structure 5 adopts a lattice structure, and the diameter of the lattice structure is 1 mm; wherein the lattice structure 5 is composed of a plurality of connecting bars, and the diameter of the connecting bars ranges from 0.5 to 5 mm. In this embodiment, the diameter of the connecting bars is 0.8 mm.

[0052] Nitrogen is used as the pre-treatment protective gas; the powder spreading speed of 3D printing is 200 mm / s; the 3D printing material is martensitic stainless steel; and the heating temperature of the printing device substrate 10 is 120°C.

[0053] The printing parameters of the ejector body 4 and the dot matrix structure 5 are: laser power of 380 W, scanning spacing of 0.12 mm, scanning speed of 1500 mm / s, printing layer thickness of 0.08 mm, scanning rotation angle of 47-113°, and scanning width of 8-20 mm.

[0054] The printing parameters of the exhaust structure 7 are: laser power of 250 W, scanning spacing of 0.15 mm, scanning speed of 1500 mm / s, printing layer thickness of 0.08 mm, scanning rotation angle of 45 to 90°, and scanning width of 20 to 100 mm.

[0055] The ejector body 4, the exhaust structure 7 and the lattice structure 5 are integrally formed by 3D printing. After the 3D printing is completed, post-processing is performed, including cleaning the powder on the operating table, wire cutting, heat treatment, and testing the size and ventilation effect of the ejector;

[0056] The heat treatment process includes:

[0057] Annealing treatment: heating to 300-800℃ for 1-2 hours, keeping at this temperature for 1-2 hours, and then air cooling to room temperature;

[0058] Cryogenic treatment: keep at -60-120℃ for 1-2 hours, then air cool to room temperature 1-2 times;

[0059] Tempering treatment: heating up to 300-800℃ for 1-2 hours, keeping warm for 3-8 hours;

[0060] After the fired refractory bricks are cooled to room temperature, the heat treatment is completed.

[0061] After the heat treatment is completed, machining is carried out to ensure that the dimensional accuracy of the ejector structure meets the requirements; after machining is completed, the size and air permeability of the ejector structure are tested until they meet the requirements.

[0062] The utility model can meet the melting index of different injection materials in the injection mold to adjust the air permeability porosity, and is not limited by the product structure. In the state of small diameter, small specification and small size, the air permeability arrangement can be carried out according to the size of the ejector pin.

[0063] The structural arrangement of the utility model is not limited by the diameter of the ejector pin of the mold, and can be directly printed to the top of the ejector pin through a breathable process, and then the precision is processed to a qualified size through traditional machining.

[0064] The structure of the circular needle commonly used in the prior art is that the exhaust method includes the following steps:

[0065] Process 1: Cutting the solid steel;

[0066] Process 2: Use high-frequency heating cold stamping to stamp the head of the steel into shape, and anneal after stamping to prevent stress concentration from causing steel breakage;

[0067] Process 3: Use a blank needle of a certain length to process the inner hole of the steel. Due to the limitation of the length of the steel, it is usually necessary to process the inner hole on both sides;

[0068] Process 4: Grind the finished parts and perform vacuum heat treatment;

[0069] Process 5: After the heat treatment is completed, fine grinding and correction are carried out, and the exhaust groove is evenly polished on the top of the processed parts. The circular needle is deflected and the air inlet position is repaired, and it can be used.

[0070] A commonly used method also includes a processing method of inlaying by splicing, and exhausting by reserving gaps. The processing of this structure specifically includes the following steps:

[0071] Process 1: Find the trapped air position and cut out the position with poor exhaust by wire cutting;

[0072] Process 2: After the position is cleared, measure the precise dimensions;

[0073] Process 3: According to the design, use the solid steel wire-cutting process to cut into pieces, usually 15-30 pieces need to be cut;

[0074] Process 4: After cutting, local exhaust groove processing is performed. This process has extremely high processing requirements. Once the size is out of tolerance, there is a risk of injection molding leakage;

[0075] Process 5: After processing is completed, burrs are trimmed. When there are size restrictions during precision assembly, the size is adjusted until the precision fit requirements are met.

[0076] The processing of this structure is subject to high costs and great space limitations, and has strict requirements on the actual processing environment. In addition, due to cost control considerations, this solution is usually not used in actual processing.

[0077] The present embodiment provides a 3D printing ejector structure, including a base and an exhaust ejector connected to one end of the base, the exhaust ejector including an ejector body 4, a lattice structure 5 and an exhaust structure 7, the base is provided with an exhaust channel; the base adopts a limiting cap 1, the exhaust channel is arranged inside the limiting cap 1, the exhaust channel is arranged as a connecting through hole 8 on the axis of the limiting cap 1, the connecting through hole 8 can be used to connect with the base 10 of the printing device, the exhaust structure 7 is arranged at the other end of the ejector body 4, the lattice structure 5 plays a supporting role inside the ejector body 4, the lattice structure 5 is integrally formed, the lattice structure 5 is arranged along the axis of the ejector body 4, the lattice structure A lattice structure is arranged in the ejector body 4, and the support of the lattice structure is on the inner wall of the ejector body 4. Air can circulate inside the lattice structure. In this embodiment, the lattice structure 5 is arranged as a grid bar arranged in a space lattice, and the diameter of the grid bar of the lattice structure is 0.5 mm. The connecting through hole 8 is used for exhaust. The exhaust structure 7 points to the air-trapping part in actual use. The exhaust structure 7 is arranged as a channel structure. A plurality of channels are arranged, and the plurality of channels are arranged in the same direction. The channels on the exhaust structure 7 are connected with the crystal structure in the lattice structure 5, and the gas can be effectively passed from the exhaust structure 7 to the end of the lattice structure 5 away from the exhaust structure.

[0078] In this embodiment, the shape of the exhaust structure 7 is adaptively selected according to different exhaust pin structures, such as Figure 4-5 Shown are square and circular exhaust structures 7 .

[0079] In this embodiment, a grafting base 2 and a ejector body 4 are provided, wherein one end of the grafting base 2 having an exhaust hole 3 is connected to one end of the ejector body 4, the other end of the grafting base 2 is connected to a limiting cap 1, and the other end of the ejector body 4 is provided with an exhaust structure 7, a connecting through hole 8 is provided inside the limiting cap 1, and the connecting through hole 8 is connected to a printing device, the exhaust structure 7 points to a local trapped air location, a lattice structure 5 is provided inside the ejector body 4, and the exhaust structure 7 is provided as a microporous structure; wherein the grafting base 2 is usually provided by machining.

[0080] In this embodiment, a connection hole is provided at one end where the grafting base 2 and the ejector body 4 are connected, and the connection hole is provided on the axis of the grafting base 2. The exhaust hole 3 is provided at one end where the grafting base 2 and the ejector body 4 are connected, and the exhaust hole 3 is provided along the radial direction of the grafting base 2. The diameter of the exhaust hole 3 is smaller than the diameter of the connection hole.

[0081] In this embodiment, the diameter d of the exhaust structure ranges from 1 to 94 mm, and the diameter h of the lattice structure is smaller than the diameter of the exhaust structure 7. In order to prevent the exhaust from being obstructed at the step where the lattice structure 5 and the exhaust structure 7 are connected, an angled feature 6 is designed at the step to utilize the overall effective exhaust space of the exhaust structure 7. The angle θ between the exhaust structure and the lattice structure ranges from 30 to 80°.

[0082] In this embodiment, the micropore diameter of the microporous structure of the exhaust structure 7 is 0.02-0.6mm. The microporous structure ensures exhaust without affecting the surface of the molded product, reducing the blockage of plastic debris. The specific hole spacing of the microporous structure is 0.1-0.5mm, and the thickness c of the exhaust structure in the axial direction of the ejector structure is 0.5-40mm; the ejector body length a is 20-250mm, and the ejector body diameter e is 3-100mm; the length of the lattice structure 5 is 0mm-249mm. The exhaust structure is composed of 3D printed integrated micropores to ensure that the gas in the mold cavity is discharged smoothly, while meeting the overflow value of different molded plastic materials and not affecting the surface quality of the product.

[0083] In this embodiment, when the grafting base 2 is arranged between the limiting cap 1 and the ejector body 4, it includes a first substrate clamp 8 and a second substrate clamp 9, and the grafting base 2 is clamped inside the V-shaped groove structure formed between the first substrate clamp 8 and the second substrate clamp 9.

[0084] The utility model completes the processing through the following steps:

[0085] Determine the processing parameters of the 3D printing software;

[0086] After the pre-processing is completed, the ejector body 4, the lattice structure 5 and the exhaust structure 7 of the ejector structure are integrally printed, and the post-processing is performed after the printing is formed;

[0087] Inspect the size and performance of the ejector structure after printing until it passes the inspection;

[0088] Wherein, the lattice structure 5 adopts a lattice structure, and the diameter of the lattice structure is 0.5-5mm;

[0089] The pre-treatment protective gas is argon or nitrogen; the 3D printing powder spreading speed is 50-200 mm / s; the 3D printing material is martensitic stainless steel; the heating temperature of the printing device substrate 10 is 80-120°C.

[0090] The printing parameters of the ejector body 4 and the dot matrix structure 5 are: laser power of 80-380 W, scanning spacing of 0.02-0.12 mm, scanning speed of 450-1500 mm / s, printing layer thickness of 0.025-0.08 mm, scanning rotation angle of 47-113°, and scanning width of 8-20 mm.

[0091] The printing parameters of the exhaust structure 7 are: laser power of 80-250W, scanning spacing of 0.1-0.15mm, scanning speed of 450-1500mm / s, printing layer thickness of 0.025-0.08mm, scanning rotation angle of 45-90°, and scanning width of 20-100mm.

[0092] Since the ejector pin structure is the core component of the ejector product in the injection molding mold, the ejector pin structure is redesigned and the innovative concept of 3D printing is used to overturn the traditional machining manufacturing process technology, redesign and optimize the internal ejector pin structure of the product, and the process of using the lattice structure as the support can achieve the effect of weight reduction. At the same time, it can print efficiently to improve work efficiency and reduce manufacturing costs. In addition, the integrated printing technical solution is adopted, and the solid lattice structure design is adopted at the same time. The ejector pin body, lattice structure and exhaust structure of the exhaust ejector are printed and formed in sequence by 3D printing. The structure can directly discharge the gas generated at the moment of injection molding, thereby reducing the occurrence of defective rates caused by injection molding. At the same time, the design concept is to use 3D printing technology to achieve the goal of the glue plane of the product at the junction of the ejector pin and the product. The ejector pin structure is not limited by the position and structure size of the product, and has flexible characteristics.

[0093] In actual applications, due to the problem of damage to the machined ejector pin, the rate of the device being returned to the factory is effectively reduced by connecting the grafting base 2. In the actual selection of the lattice structure, the lattice structure 5 is selected according to the size characteristics of the ejector body 4. When the size of the ejector body 4 is relatively small, the size of the lattice structure 5 is adaptively reduced, which can effectively reduce the production cost of the ejector structure and effectively expand the scope of use of the device. The utility model changes the lattice structure as the diameter of the ejector body increases, which not only ensures the exhaust effect, but also takes into account the rigidity of the structure and the printing efficiency. When a grafting base is provided in a 3D printed ejector pin structure provided by the utility model, the grafting base 2 is stably provided by the provision of the first substrate clamp 8 and the second substrate clamp 9, ensuring the connection stability of the device, increasing the processing reliability of the device, and ensuring the integrity and stability of the structure.

[0094] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended to include all changes within the meaning and scope of the equivalent elements of the claims. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0095] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. Other different forms of changes or modifications can also be made on the basis of the above description. It is not necessary and impossible to list all the implementation modes here. The obvious changes or modifications derived therefrom are still within the protection scope of the invention of the utility model.

Claims

1. A 3D printed ejector pin structure, characterized in that: The invention comprises a base and an exhaust ejector pin connected to one end of the base, wherein the base is provided with an exhaust passage; the exhaust ejector pin comprises an ejector pin body (4), a lattice structure (5) and an exhaust structure (7), wherein the lattice structure (5) is supported inside the ejector pin body (4), and the exhaust structure (7) is located at one end of the lattice structure (5) away from the base; the exhaust structure (7) is provided with a plurality of channels (15), and the channels (15) on the exhaust structure (7) and the exhaust passage are connected through gaps inside the lattice structure (5).

2. A 3D printed ejector pin structure according to claim 1, characterized in that: The ejector body (4), the lattice structure (5) and the exhaust structure (7) are an integrated structure produced by 3D printing.

3. A 3D printed ejector pin structure according to claim 1, characterized in that: The base is a limiting cap (1), the exhaust passage is a connecting through hole (8) arranged in the limiting cap (1), and the connecting through hole (8) is also used for connecting the limiting cap (1) and an external component.

4. A 3D printed ejector pin structure according to claim 1, characterized in that: The base comprises a limiting cap (1) and a grafting base (2); the limiting cap (1), the grafting base (2) and the exhaust ejector structure are connected in sequence; and the exhaust channel is an exhaust hole (3) arranged on a wall at one end where the grafting base (2) is connected to the ejector body (4).

5. The 3D printed ejector pin structure according to claim 1, characterized in that: The lattice structure (5) is a three-dimensional lattice structure in a lattice shape.

6. The 3D printed ejector pin structure according to claim 1, characterized in that: The length (a) of the ejector body is in the range of 20-450 mm, and the diameter (e) of the ejector body is in the range of 3-100 mm.

7. The 3D printed ejector pin structure according to claim 1, characterized in that: The diameter of the connecting strips in the lattice structure (5) is in the range of 0.5-5 mm.

8. The 3D printed ejector pin structure according to claim 1, characterized in that: The hole channel (15) in the exhaust structure (7) is arranged along the axial direction of the ejector pin structure, the hole diameter of the hole channel (15) ranges from 0.02 to 0.6 mm, the hole spacing ranges from 0.1 to 0.5 mm, and the thickness (c) of the exhaust structure in the axial direction of the ejector pin structure ranges from 0.5 to 40 mm.

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