PSU injection molding central pipe, injection molding process and injection molding mold of PSU injection molding central pipe

Abstract

The invention discloses a PSU injection molding center pipe, an injection molding process and an injection mold thereof, and relates to the technical field of center pipes, the PSU injection molding center pipe comprises a center pipe, a plurality of sets of integrally-formed molding hole sites are arranged and distributed in the pipe wall of the center pipe, and the center pipe is provided with a first parting surface in the length direction of the center pipe; the first parting surface corresponds to part of the opposite forming hole positions, and a second parting surface is arranged on the side wall, surrounding the inner ring of the center pipe, of the center pipe. The design that the formed hole site and the center pipe are integrally formed in an injection molding mode is adopted, the problems of scrap residues, cutting fluid secondary pollution and the like caused by traditional secondary hole site machining are thoroughly solved, the cleanliness of the inner wall of the hole site of the center pipe meets the requirements of the high-end fields such as medical treatment and electronics, and meanwhile the relative position precision of the hole site and the center pipe body can be guaranteed through the integrally-formed structure; hole position deviation caused by secondary machining is prevented, and the pollution problem caused by extrusion and secondary machining of the center pipe is solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of center pipes, in particular to a PSU injection-molded center pipe, an injection-molding process and an injection-molding mold thereof. BACKGROUND

[0002] The working principle of an RO reverse osmosis membrane is to utilize the selective permeation characteristics of a semi-permeable membrane to establish a pressure difference between different concentration solutions, so that water molecules permeate through the membrane, while impurities such as dissolved salts, colloids, organic matter, bacteria and viruses in the water are intercepted, thereby realizing deep purification of the water quality. The function is to efficiently remove dissolved salts, microorganisms and organic matter in the water, greatly improve the purity of the water, and provide water quality meeting the requirements for downstream water use scenarios. The center pipe is a core functional component of a reverse osmosis filtration membrane system, mainly bearing three key functions of fluid guiding, medium shunting and structural support of the reverse osmosis membrane. In the process of fluid permeating through the membrane, the center pipe needs to guide the uniform distribution of the fluid to be filtered to the surface of the reverse osmosis membrane, and efficiently collect and guide the filtered clean fluid. It is widely used in various fluid permeation guiding pipes: pharmaceutical grade, sanitary grade, high temperature, high pressure and other filtration membranes.

[0003] At present, the production of center pipes in the industry generally adopts an extruder to extrude a hollow center pipe body. The length and outer diameter of the center pipe are controlled by a traction device during the extrusion process to ensure the basic forming precision of the main structure. After the extruded center pipe body is cooled and shaped, a special mechanical processing equipment is used to perform secondary processing on the circumferential side wall of the center pipe, and a plurality of small holes are processed on the pipe wall according to design requirements. According to the above related technology, the inventors believe that the center pipe will be contaminated during the transportation process after extrusion and cooling, and a large amount of fine debris will be generated during the processing process. These debris are easy to adhere to the inner wall of the small hole or embed in the small gap of the center pipe wall, causing secondary pollution to the center pipe itself. SUMMARY

[0004] The purpose of the application is to provide a PSU injection-molded center pipe, an injection-molding process and an injection-molding mold thereof to improve the problem that the center pipe will be contaminated during the transportation process after extrusion and cooling, and a large amount of fine debris will be generated during the processing process. These debris are easy to adhere to the inner wall of the small hole or embed in the small gap of the center pipe wall, causing secondary pollution to the center pipe itself.

[0005] The application provides a PSU injection-molded center pipe, an injection-molding process and an injection-molding mold thereof, which adopt the following technical solutions: A PSU center pipe, comprising a center pipe, a plurality of groups of integrally formed forming hole positions are arranged and distributed on the pipe wall of the center pipe, a parting surface one is arranged on the center pipe along the length direction of the center pipe, the parting surface one corresponds to part of the opposite forming hole positions, and a parting surface two is arranged around the inner ring side wall of the center pipe.

[0006] By adopting the technical scheme, the polysulfone (PSU) material itself has the characteristics of high temperature resistance, corrosion resistance and high mechanical strength, the PSU center pipe is integrally injection molded with the formed hole and the center pipe, which completely prevents the problems of chip residue and secondary pollution of cutting fluid caused by traditional secondary processing hole, so that the inner wall cleanliness of the hole of the center pipe meets the requirements of high-end fields such as medical treatment and electronics, and the relative position accuracy of the hole and the main body of the center pipe can be ensured by the integral molding structure, and the hole offset caused by secondary processing is prevented; the parting surface I corresponds to part of the formed hole, so that the hole can be avoided from stress when the mold is opened, the hole edge is prevented from being damaged or deformed, and the structural integrity of the hole is ensured.

[0007] Optionally, the inner circle side wall of the center pipe at both ends is arranged in a stepped surface.

[0008] By adopting the technical scheme, the stepped surface of the inner circle of the center pipe at both ends can be used as a positioning reference during assembly, which facilitates accurate butt joint with the matching pipe fitting, reduces assembly gap, and improves the sealing performance of the overall system.

[0009] Optionally, the outer surface of the center pipe is provided with a plurality of ejection points, and the ejection points are located away from the parting surface I and in the same center pipe axis direction as one of the formed holes.

[0010] By adopting the technical scheme, the ejection points are arranged away from the parting surface I, which can avoid the parting surface cracking or deforming caused by the ejection force being concentrated near the parting surface during demolding, and ensure the appearance integrity of the center pipe; the ejection points and one of the formed holes are in the same center pipe axis direction, which can make the ejection force evenly transmitted along the center pipe axis, avoid plastic deformation of the PSU material caused by excessive local stress, ensure smooth demolding process, prevent the center pipe from adhering to the mold cavity, and further improve the product qualification rate.

[0011] Optionally, the outer circle side surface of the center pipe is provided with an injection point, and the injection point is arranged opposite to the ejection point.

[0012] By adopting the technical scheme, the injection point is arranged on the outer circle side surface of the center pipe, so that the melt can be injected from a non-critical functional area, avoiding local shrinkage and bubbles caused by the melt directly impacting the formed hole; combined with the injection channel design of the mold, the melt can be evenly filled into the formed mold cavity along the circumference of the center pipe, reducing the generation of weld marks, and the injection point is away from the formed hole, which can avoid the influence of gate residue on the fluid distribution function of the hole.

[0013] The utility model provides a kind of center tube injection mold, including fixed mould base and movable mould base, the fixed mould base, movable mould base mutually close side is provided with cavity mould corresponding with pre-injection center tube, movable mould base is provided with with the corresponding pull rod assembly of center tube inner wall at both ends of cavity mould, cavity mould is provided with with the corresponding forming cavity of center tube, the inner wall of forming cavity is provided with with the corresponding forming assembly one of the forming hole position of center tube side wall, movable mould base is provided with with the corresponding forming assembly two of the forming hole position of center tube upper and lower position on both sides;Fixed mould base, movable mould base between being opened with the corresponding installation groove one of cavity mould, fixed mould base is provided with with the injection channel of cavity mould intercommunication, fixed mould base side wall is provided with with the sprue bush of injection channel intercommunication, movable mould base, fixed mould base between being opened with the corresponding give room slot of forming assembly two;The pull rod assembly includes the insertion rod one, insertion rod two of being slidably arranged along movable mould base length direction towards cavity mould at both sides of movable mould base, movable mould base both ends are provided with with the drive oil cylinder of driving insertion rod one, insertion rod two relative movement, the outer diameter size between insertion rod one, insertion rod two and the inner diameter size of the inner wall of forming cavity leaves gap for center tube injection forming.

[0014] By adopting the above technical scheme, the forming cavity on the cavity mold provides a basic forming space for the center tube, and the pull rod assembly can stably support the inner wall of the center tube to prevent the inner wall from collapsing or deforming due to the melt pressure during injection molding. The forming assembly one covers the forming hole position of the side wall of the center tube, and the forming assembly two covers the forming hole position of the upper and lower positions, so that multiple forming hole positions of the side wall of the center tube are injection molded together with the center tube to prevent the problems of missing molding or position deviation of the forming hole position caused by a single forming structure. The coaxial design of the three ensures the relative position accuracy of the forming hole position and the inner wall of the center tube from the source, which can accurately dock with the matching parts during subsequent assembly, greatly reducing the product scrap rate caused by position deviation. The cooperation of the injection channel and the sprue bush enables the melt to be uniformly and stably injected into the forming cavity along the preset path, preventing turbulence, flow interruption or sudden increase in local pressure during melt injection, and reducing appearance defects such as bubbles, material defects and shrink marks on the surface of the center tube. The give room slot provides moving and avoiding space for the forming assembly two to prevent structural interference between the forming assembly two and the fixed mould base and movable mould base during mold closing and molding, ensuring that the forming assembly two can smoothly enter the forming cavity to complete the molding of the upper and lower side forming hole positions.

[0015] Optionally, the end of the insertion rod one close to the insertion rod two is provided with a limiting protrusion, the end of the insertion rod two is provided with a limiting groove one corresponding to the limiting protrusion, and the position close to the drive oil cylinder of the insertion rod one and the insertion rod two is provided with a step corresponding to the inner side wall of the center tube.

[0016] By adopting the technical scheme, the cooperation of the limiting protrusion and the limiting groove one can realize accurate positioning when the plug rod one and the plug rod two are connected, prevent misalignment of the two from causing steps or protrusions on the inner wall of the center pipe, ensure smoothness of the inner wall, and reduce subsequent processing procedures; the setting of the stepped section enables the plug rod one and the plug rod two to adapt to the stepped structure on the inner wall of the center pipe, and the stepped section can increase the stress area of the plug rod one and the plug rod two close to the end of the driving oil cylinder, enhance the structural strength of the plug rod, prevent bending deformation of the plug rod caused by uneven stress during driving, and prolong the service life of the plug rod.

[0017] Optionally, the forming assembly one comprises a plurality of top cores one arranged on the inner side wall of the forming cavity in the length direction of the cavity mold, the movable mold base is provided with a push plate, the push plate is provided with a ejector rod penetrating through the cavity mold, the end of the ejector rod is flush with the inner side wall of the forming cavity, the side of the movable mold base away from the cavity mold is provided with a limiting frame corresponding to the push plate, and the push plate is provided with a guide rod inserted into the movable mold base.

[0018] By adopting the technical scheme, the plurality of top cores one are arranged in the length direction of the cavity mold, the spacing and the hole diameter of the forming hole of the side wall of the center pipe can be accurately controlled, and the consistency of the forming hole size can be ensured; the push plate drives the ejector rod to move, which can assist in pushing the center pipe during demolding, prevent the center pipe from being unable to smoothly separate from the forming cavity due to adhesion with the inner wall of the forming cavity, and the end of the ejector rod is flush with the inner side wall of the forming cavity, corresponding to the ejection point of the outer surface of the center pipe.

[0019] Optionally, the inner side wall of the retreat groove of the movable mold base is provided with a guide rail corresponding to the forming assembly two, the forming assembly two comprises a sliding block one in sliding connection with the guide rail and a plurality of top cores two arranged on the side of the sliding block one close to the forming cavity, the fixed mold base located on the inner side wall of the retreat groove is provided with a top block corresponding to the sliding block one, the top blocks located on the upper and lower sides of the fixed mold base are arranged in a direction away from each other, the side wall of the sliding block one is provided with an inclined groove corresponding to the top block, and when the movable mold base is close to the fixed mold base, the top block is attached to the inner side wall of the inclined groove, so that the sliding blocks one located on the upper and lower sides of the cavity mold are close to each other, and the top cores two enter the inside of the forming cavity to make the forming hole of the circumferential side wall of the center pipe injection molding.

[0020] By adopting the technical scheme, when the mold is closed, the top block of the fixed mold base moves with the fixed mold base to attach to the inclined groove of the sliding block one, and the sliding block one is driven to move along the sliding groove to the forming cavity through the extrusion of the inclined surface, so that the top cores two enter the forming cavity to complete the molding of the upper and lower forming holes, without the need for additional power sources such as cylinders and oil cylinders, reducing the complexity and manufacturing cost of the mold.

[0021] Optionally, one side of the sliding block I close to the cavity mold is provided with a connecting rod connected with the outside of the cavity mold, a guide hole corresponding to the connecting rod is arranged in the sliding block I, an elastic member is arranged between the connecting rod outside the sliding block I and the cavity mold, a limiting hole is arranged in the inner wall of the guide hole, and a limiting block is arranged in the end of the connecting rod in the limiting hole; the end of the inserting rod I and the inserting rod II close to the driving oil cylinder is respectively provided with a sliding block II connected with the driving end of the driving oil cylinder, the side of the sliding block II facing the fixed mold base is provided with a guide inclined block, and the fixed mold base is provided with a limiting groove II corresponding to the guide inclined block.

[0022] By adopting the above technical scheme, the elastic member is compressed to store reset force when the mold is closed, and after the ejector block is separated, the elastic member can automatically push the sliding block I to reset along the guide hole, so that the second top core stably exits the forming cavity, and the sliding block I is prevented from being stuck due to guide rail friction or impurities, so that the second top core cannot be reset; the cooperation of the connecting rod and the guide hole provides secondary guidance for the movement of the sliding block I, further ensures the movement of the sliding block I in the preset direction, and prevents the second top core from deviating; the cooperation of the limiting block and the limiting hole can prevent the sliding block I from being separated from the movable mold base due to excessive elastic force of the elastic member when resetting, so that the sliding block I is always in the double constraints of the guide rail and the guide hole, the overall structural reliability of the second forming assembly is improved, and mold failure caused by the separation of the sliding block I is prevented.

[0023] A PSU center tube processing technology, comprising the following steps: S100, after the movable mold base and the fixed mold base are closed, the inserting rod I and the inserting rod II of the ejector rod assembly are connected inside the forming cavity, so that the first top core and the second top core of the first forming assembly and the second forming assembly are located inside the forming cavity; S200, the melt flows uniformly into the forming cavity through the injection channel, and after the melt fills the forming cavity, a plurality of forming hole positions of the center tube wall are formed under the forming action of the first top core and the second top core, the parting surface I of the center tube outer ring surface is formed by the cavity mold, the parting surface II of the center tube inner ring side wall is formed by the ejector rod assembly, and the injection point position of the center tube surface is formed; S300, then after the mold is opened, the formed center tube is uniformly pushed by the ejector rod to form the ejection point position on the outer ring surface of the center tube.

[0024] In summary, the present application has at least one of the following beneficial technical effects: 1. The design of forming hole site and center tube integrated injection molding, completely prevent the debris residue, cutting fluid secondary pollution and other problems caused by traditional secondary processing hole, make the hole site inner wall cleanliness of center tube meet the requirements of high-end fields such as medical treatment and electronics, at the same time, the integrated structure can ensure the relative position accuracy of hole site and center tube main body, prevent the hole site deviation caused by secondary processing; the parting surface one corresponds to part of the forming hole site, which can avoid the stress of hole site when the mold is opened, prevent the edge of hole site from being damaged or deformed, and ensure the integrity of hole site structure; 2. The elastic piece is compressed and stored reset force when the mold is closed, after the ejector block is separated, the elastic piece can automatically push the sliding block one to reset along the guide hole, ensure that the second ejector core stably exits the forming cavity, prevent the sliding block one from being stuck due to guide rail friction or impurities, which causes the second ejector core to be unable to reset; the cooperation of connecting rod and guide hole provides secondary guidance for the movement of sliding block one, further ensures the movement of sliding block one in the preset direction, prevents the second ejector core from deviating; the cooperation of limiting block and limiting hole can prevent the sliding block one from being separated from the movable mold base due to excessive elastic force of the elastic piece when resetting; 3. The PVD special coating greatly reduces the friction resistance between the insertion rod and the inner wall of the center tube, prevents the inner wall of the center tube from being scratched during the extraction process of the insertion rod one and the insertion rod two, and ensures the smoothness of the inner wall; at the same time, the special coating prevents the molten material from adhering to the surface of the insertion rod, so that the insertion rod one and the insertion rod two can be smoothly extracted from the inner wall of the center tube, reduce the demolding resistance, and prevent the center tube from being deformed or broken due to excessive demolding force. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a whole schematic diagram of PSU injection center tube; Figure 2 It is a partial schematic diagram of PSU injection center tube; Figure 3 It is a whole schematic diagram of center tube injection mold; Figure 4 It is a whole sectional view of center tube injection mold; Figure 5 It is Figure 4 the local enlarged view of A part in Figure 6 It is a partial sectional view of center tube injection mold.

[0026] In the figure, 1, fixed mold base; 11, mounting groove one; 12, injection channel; 13, sprue bushing; 14, clearance groove; 15, top block; 16, limiting groove two; 2, movable mold base; 21, push plate; 211, ejector rod; 22, limiting frame; 221, guide rod; 23, guide rail; 3, cavity mold; 31, forming cavity; 33, connecting rod; 34, elastic element; 35, limiting block; 4, center tube; 41, forming hole site; 42, parting surface one; 43, parting surface two; 45, ejection point; 46, injection point; 5, ejector assembly; 51, drive oil cylinder; 52, insertion rod one; 521, limiting protrusion; 53, insertion rod two; 531, limiting groove one; 532, stepped section; 54, sliding block two; 55, guide inclined block; 56, special coating; 6, forming assembly one; 61, top core one; 7, forming assembly two; 71, sliding block one; 711, inclined groove; 72, top core two; 73, guide hole; 74, limiting hole. DETAILED DESCRIPTION

[0027] The following description will be made in conjunction with the accompanying drawings. Figure 1 - the accompanying drawings Figure 6 The present application will be further described in detail. EMBODIMENT

[0028] A PSU center tube, referring to Figure 1 and Figure 2 , comprises a center tube 4, the tube wall of the center tube 4 is arranged and distributed with a plurality of groups of integrally injection-molded forming hole sites 41, the center tube 4 itself is provided with an injection-molded parting surface one 42 along its length direction, the parting surface one 42 corresponds to the opposite forming hole sites 41, the center tube 4 is also provided with an injection-molded parting surface two 43 around its inner ring side wall, which prevents the problems such as debris residue and secondary pollution of cutting fluid caused by traditional secondary processing hole, makes the hole inner wall cleanliness of the center tube 4 meet the requirements of high-end fields such as medical treatment and electronics, and ensures the relative position accuracy of the hole and the main body of the center tube 4 by the integrally formed structure, preventing the hole from deviating caused by secondary processing.

[0029] Referring to Figure 1 and Figure 2 , the center tube 4 is arranged at the stepped section 532 of the inner ring side wall at both ends of the center tube 4; the center tube 4 is provided with a plurality of ejection points 45 on the outer surface, the ejection points 45 are located away from the parting surface one 42 and are in the same center tube 4 axial direction with one group of forming hole sites 41, the ejection points 45 are arranged away from the parting surface one 42, which can avoid the parting surface cracking or deformation caused by the ejection force concentrated near the parting surface during demolding, and ensure the integrity of the appearance of the center tube 4; the center tube 4 is provided with injection points 46 on the outer ring side surface, the injection points 46 are arranged opposite to the ejection points 45, and the injection points 46 are away from the forming hole sites 41, which can avoid the influence of residual gate on the fluid distribution function of the hole. EMBODIMENT

[0030] A center tube injection mold, referring to Figure 3 、 Figure 4 and Figure 5 , including the opposite setting of the fixed mold base 1 and the movable mold base 2, the fixed mold base 1 is fixedly connected with the injection machine's injection bench (not shown in the figure), the movable mold base 2 is fixedly connected with the driving device (not shown in the figure) of the injection machine, the fixed mold base 1 and the movable mold base 2 are provided with an installation groove 11 on the side close to each other, the cavity mold 3 is fixed in the installation groove 11 through bolts, the cavity mold 3 forms a molding cavity 31 matched with the profile of the pre-injection center tube 4 after being buckled, the inner side wall of the molding cavity 31 is provided with a molding assembly 6 corresponding to the molding hole 41 of the side wall of the center tube 4, the molding assembly 6 includes a plurality of top cores 61 sealingly inserted and fixed in the inner side wall of the molding cavity 31, the top cores 61 are distributed along the length direction of the cavity mold 3, and are used for molding the opposite molding hole 41 of the side wall of the center tube 4.

[0031] Referring to Figure 3 、 Figure 4 and Figure 5 , the movable mold base 2 is provided with an extraction rod assembly 5 at both ends of the cavity mold 3, the extraction rod assembly 5 includes a plug rod 52 and a plug rod 53 which are slidingly arranged along the length direction of the movable mold base 2 towards the cavity mold 3 at both sides of the movable mold base 2, the movable mold base 2 is provided with a sliding hole position adapted to the plug rod 52 and the plug rod 53 on the side facing the cavity mold 3, the plug rod 52 and the plug rod 53 are respectively arranged in the sliding hole position and can slide along the length direction of the movable mold base 2 towards or away from the cavity mold 3; the movable mold base 2 is provided with a driving oil cylinder 51 at both ends through bolts, the driving end of the driving oil cylinder 51 is fixedly connected with the end of the plug rod 52 and the plug rod 53 away from the cavity mold 3; the end of the plug rod 52 close to the plug rod 53 is integrally formed with a limiting protrusion 521, the end of the plug rod 53 is provided with a limiting groove 531 adapted to the limiting protrusion 521, the plug rod 52 and the plug rod 53 are integrally formed with a stepped section 532 matched with the stepped structure of the inner side wall of the center tube 4 at the position close to the driving oil cylinder 51, and the outer diameter size of the plug rod 52 and the plug rod 53 and the inner diameter size of the inner side wall of the molding cavity 31 leave a gap, the width of the gap is equal to the designed wall thickness of the center tube 4.

[0032] Referring to Figure 3 and Figure 6The upper and lower sides of the movable mold base 2 are provided with forming assemblies two 7 corresponding to the forming hole positions 41 on the upper and lower positions of the center pipe 4, and the upper and lower sides of the movable mold base 2 are provided with displacement grooves 14 corresponding to the forming assemblies two 7. The inner side wall of the displacement groove 14 is fixedly connected with a guide rail 23 extending radially along the forming cavity 31 through a bolt, and the cross section of the guide rail 23 is T-shaped. The forming assembly two 7 comprises a sliding block one 71 connected with the guide rail 23 in a sliding mode, and the inner side of the sliding block one 71 is provided with a groove matched with the guide rail 23. A plurality of top cores two 72 are integrally formed or fixedly connected through threads on the side of the sliding block one 71 close to the forming cavity 31. The inner side wall of the displacement groove 14 of the fixed mold base 1 is fixedly connected with a top block 15 through welding or a bolt, and the top blocks 15 on the upper and lower sides of the fixed mold base 1 are arranged in an inclined mode away from each other. The side wall of the sliding block one 71 is provided with an inclined groove 711 matched with the inclined angle of the top block 15. The side of the sliding block one 71 close to the cavity mold 3 is provided with a connecting rod 33, the outer side wall of the cavity mold 3 is provided with a connecting hole matched with the connecting rod 33, the sliding block one 71 is provided with a guide hole 73 matched with the connecting rod 33, one end of the connecting rod 33 is inserted into the guide hole 73, and the other end is fixedly connected with the connecting hole of the cavity mold 3 through threads. The elastic member 34 is sleeved between the connecting rod 33 and the cavity mold 3 on the outer side of the connecting rod 33, and the elastic member 34 is a compression spring.

[0033] With reference to Figure 3 , Figure 4 and Figure 6 , the inner side of the fixed mold base 1 is provided with an injection channel 12 communicated with the forming cavity 31 of the cavity mold 3, and the side wall of the fixed mold base 1 is fixedly connected with a sprue bush 13 communicated with the injection channel 12 through an interference fit, and the end of the sprue bush 13 away from the fixed mold base 1 is matched with the nozzle of the injection molding machine. The movable mold base 2 is provided with a push plate 21, and the side of the push plate 21 facing the cavity mold 3 is fixedly connected with a plurality of ejector rods 211 penetrating through the cavity mold 3 through a bolt, and the end of the ejector rod 211 is flush with the inner side wall of the forming cavity 31. The side of the movable mold base 2 away from the cavity mold 3 is fixedly connected with a limiting frame 22 corresponding to the push plate 21 through a support, and the push plate 21 is fixedly connected with a guide rod 221 inserted into the movable mold base 2, and the guide rod 221 is in sliding fit with the movable mold base 2. The driving end of the external ejector cylinder (not shown in the figure) is connected with the push plate 21 by penetrating through the side wall of the limiting frame 22, and the push plate 211 pushes the formed center pipe 4 out of the mold after the mold is opened to complete the demolding.

[0034] With reference to Figure 4 , Figure 5 and Figure 6The end of the insertion rod one 52 and the insertion rod two 53 close to the driving oil cylinder 51 is fixed with the sliding block two 54 through bolts, the sliding block two 54 is integrally formed with the guide inclined block 55 towards the side of the fixed mold base 1, and the fixed mold base 1 is provided with the limiting groove two 16 matched with the guide inclined block 55 at both ends; the circumferential side wall of the insertion rod one 52 and the insertion rod two 53 is coated with the special coating 56 through the spraying process, the special coating 56 is selected from the PVD coating with high temperature resistance and anti-sticking, so that the molten material is prevented from adhering to the surface of the insertion rod, and the insertion rod one 52 and the insertion rod two 53 can be more smoothly pulled out from the inner wall of the center pipe 4. Embodiments

[0035] The application provides a PSU center pipe processing technology, including the following steps: S100, after the fixed mold base 1 and the movable mold base 2 are closed, the insertion rod one 52 and the insertion rod two 53 of the pull rod assembly 5 are located in the butt joint of the forming cavity 31, so that the top core one 61 and the top core two 72 of the forming assembly one 6 and the forming assembly two 7 are located in the forming cavity 31; S200, the molten material is uniformly flowed into the forming cavity 31 through the injection channel 12, after the molten material fills the forming cavity 31, a plurality of forming hole positions 41 of the center pipe 4 wall are formed under the forming action of the top core one 61 and the top core two 72, the parting surface one 42 of the outer circle surface of the center pipe 4 is formed by the cavity mold 3, the parting surface two 43 of the inner circle side wall of the center pipe 4 is formed by the pull rod assembly 5, and the injection point position 46 of the surface of the center pipe 4 is formed; S300, then the center pipe 4 after forming is uniformly pushed by the ejector rod 211 after the mold is opened, and the ejection point position 45 of the outer circle surface of the center pipe 4 is formed.

[0036] The implementation principle of the embodiment of the application is: In the injection molding stage, the melt is injected into the injection channel 12 of the fixed mold base 1 through the sprue bush 13, and then uniformly flows into the molding cavity 31 through the injection channel 12. After the melt fills the molding cavity 31, a plurality of molding hole positions 41 of the center tube 4 are formed under the blocking action of the top core one 61 and the top core two 72. During the injection molding process, the cavity mold 3 is cyclically cooled by the cooling system outside the mold to accelerate the setting of the melt. In the demolding stage, the movable mold base 2 first moves away from the fixed mold base 1. The top block 15 of the fixed mold base 1 gradually separates from the inclined groove 711 of the sliding block one 71. The sliding block one 71 slides away from the molding cavity 31 along the guide rail 23 under the resetting force of the elastic member 34, driving the top core two 72 to completely exit the molding cavity 31. Subsequently, the driving oil cylinder 51 at both ends of the movable mold base 2 pulls the plug rod one 52 and the plug rod two 53 to slide away from the cavity mold 3 along the guide hole 73. Due to the low-friction characteristics of the special coating 56 on the surfaces of the plug rod one 52 and the plug rod two 53, the plug rods can be smoothly pulled out from the inner wall of the center tube 4, preventing scratching of the inner wall. Then, the push plate 21 in the movable mold base 2 moves towards the cavity mold 3 along the guide rod 221 under the action of the external ejection oil cylinder. The push plate 21 drives the top rod 211 to move synchronously, and the top rod 211 uniformly pushes the molded center tube 4, so that the center tube 4 is separated from the molding cavity 31, and the demolding is completed. Through the molding assembly one 6 and the molding assembly two 7 arranged on the fixed mold base 1 and the movable mold base 2, the molding hole positions 41 on the side wall of the center tube 4 are injection molded together with the center tube 4, completely preventing the problems of debris residue and secondary pollution of cutting fluid caused by traditional secondary processing hole positions, so that the inner wall cleanliness of the hole positions of the center tube 4 meets the requirements of high-end fields such as medical treatment and electronics. At the same time, the integral molding structure can ensure the relative position accuracy of the hole positions and the main body of the center tube 4, prevent the hole positions from deviating caused by secondary processing, and solve the pollution problem caused by the extrusion and secondary processing of the center tube 4.

[0037] The embodiments of the specific implementation are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same parts are indicated by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be covered by the protection scope of the present application.

Claims

1. A PSU center tube, characterized in that: The central tube (4) includes a central tube (4) with several sets of integrally formed forming holes (41) arranged on its tube wall. The central tube (4) itself has a parting surface (42) along its length direction. The parting surface (42) corresponds to some of the forming holes (41). The central tube (4) has a parting surface (43) around its inner ring sidewall.

2. The PSU center tube according to claim 1, characterized in that: The two ends of the central tube (4) are arranged in a stepped section (532) on the inner side wall of the central tube (4).

3. A PSU center tube according to claim 2, characterized in that: The outer surface of the central tube (4) is provided with a number of ejection points (45), which are located away from the parting surface (42) and are on the same central tube (4) axis as one of the forming holes (41).

4. A PSU center tube according to claim 3, characterized in that: The outer ring side surface of the central tube (4) is provided with injection points (46), which are arranged opposite to the ejection points (45).

5. A central tube injection mold, characterized in that: The invention includes a fixed mold base (1) and a moving mold base (2) for injection molding a PSU center tube as described in claim 4. The fixed mold base (1) and the moving mold base (2) are provided with a cavity mold (3) corresponding to the pre-injected center tube (4) on their respective sides. The moving mold base (2) is provided with a pull rod assembly (5) corresponding to the inner wall of the center tube (4) at both ends of the cavity mold (3). The cavity mold (3) is provided with a molding cavity (31) corresponding to the center tube (4). The inner side wall of the molding cavity (31) is provided with a molding component one (6) corresponding to the molding hole position (41) on the side wall of the center tube (4). The moving mold base (2) is provided with a molding component two (7) corresponding to the molding hole position (41) at the upper and lower positions of the center tube (4) on its upper and lower sides. A mounting groove (11) corresponding to the cavity mold (3) is provided between the fixed mold base (1) and the moving mold base (2). An injection channel (12) connected to the cavity mold (3) is provided in the fixed mold base (1). A sprue sleeve (13) connected to the injection channel (12) is provided on the side wall of the fixed mold base (1). A clearance groove (14) corresponding to the molding component (7) is provided between the moving mold base (2) and the fixed mold base (1). The rod assembly (5) includes a first rod (52) and a second rod (53) slidably disposed on both sides of the moving mold base (2) along the length direction of the moving mold base (2) toward the cavity mold (3). The moving mold base (2) is provided with a driving cylinder (51) at both ends to drive the first rod (52) and the second rod (53) to move relative to each other. A gap is left between the outer diameter of the first rod (52) and the second rod (53) and the inner diameter of the inner sidewall of the molding cavity (31) for injection molding of the central tube (4).

6. A central tube injection mold according to claim 5, characterized in that: The first insertion rod (52) is provided with a limiting protrusion (521) at one end near the second insertion rod (53), and the second insertion rod (53) is provided with a limiting groove (531) corresponding to the limiting protrusion (521) at the end. The first insertion rod (52) and the second insertion rod (53) are provided with a stepped section (532) corresponding to the inner wall of the central tube (4) at the position near the driving cylinder (51).

7. A central tube injection mold according to claim 6, characterized in that: The molding component (6) includes a plurality of top cores (61) spaced along the length of the cavity mold (3) on the inner sidewall of the molding cavity (31). The moving mold base (2) is provided with a push plate (21). The push plate (21) is provided with a push rod (211) that penetrates the cavity mold (3) and faces the cavity mold (3). The end of the push rod (211) is flush with the inner sidewall of the molding cavity (31). The moving mold base (2) is provided with a limiting frame (22) corresponding to the push plate (21) on the side away from the cavity mold (3). The push plate (21) is provided with guide rods (221) inserted into the moving mold base (2) around its perimeter.

8. A central tube injection mold according to claim 7, characterized in that: The inner wall of the clearance groove (14) of the moving mold base (2) is provided with a guide rail (23) corresponding to the molding component two (7). The molding component two (7) includes a sliding block one (71) slidably connected to the guide rail (23) and a plurality of top cores two (72) arranged along the side of the sliding block one (71) close to the molding cavity (31). The fixed mold base (1) is provided with a top block (15) corresponding to the sliding block one (71) on the inner wall of the clearance groove (14). The top block (15) is located on the upper and lower sides of the fixed mold base (1). The top blocks (15) on the side are inclined in a direction away from each other. The side wall of the sliding block (71) is provided with an inclined groove (711) corresponding to the top block (15). When the moving mold base (2) is close to the fixed mold base (1), the top block (15) fits against the inner side wall of the inclined groove (711), so that the sliding blocks (71) located on the upper and lower sides of the cavity mold (3) move closer to each other, so that the top core (72) enters the mold cavity (31) and the molding hole (41) of the circumferential side wall of the center tube (4) is injection molded.

9. A central tube injection mold according to claim 8, characterized in that: The sliding block (71) is provided with a connecting rod (33) connected to the outside of the cavity mold (3) on the side near the cavity mold (3). The sliding block (71) is provided with a guide hole (73) corresponding to the connecting rod (33). An elastic element (34) is provided on the outside of the connecting rod (33) between the sliding block (71) and the cavity mold (3). A limit hole (74) is provided on the inner wall of the guide hole (73). A limit block (35) is provided at the end of the connecting rod (33) in the limit hole (74). The first insertion rod (52) and the second insertion rod (53) are respectively provided with a sliding block (54) connected to the driving end of the driving cylinder (51) near the end of the driving cylinder (51). The sliding block (54) is provided with a guide block (55) on the side facing the fixed mold base (1). The fixed mold base (1) is provided with a limiting groove (16) at both ends corresponding to the guide block (55).

10. A PSU center tube processing technology, characterized in that: Including the central tube injection mold as described in claim 9, S100, after the moving mold base (2) and the fixed mold base (1) are closed, the first insert rod (52) and the second insert rod (53) of the rod assembly (5) are connected inside the molding cavity (31), so that the first core (61) and the second core (72) of the molding assembly (6) and the molding assembly (7) are all located inside the molding cavity (31). S200, the molten material flows evenly into the molding cavity (31) through the injection channel (12). After the molten material fills the molding cavity (31), it forms multiple molding holes (41) on the wall of the central tube (4) under the molding action of the first core (61) and the second core (72). The mold cavity (3) forms the first parting surface (42) on the outer ring surface of the central tube (4). The pull rod assembly (5) forms the second parting surface (43) on the inner ring side wall of the central tube (4). The injection point (46) is formed on the surface of the central tube (4). S300, then after the mold is opened, the ejector pin (211) pushes the formed center tube (4) evenly, forming an ejection point (45) on the outer surface of the center tube (4).

Images