Production process of open type slurry pump impeller

Abstract

The application relates to an open-type slag slurry pump impeller production process and belongs to the technical field of impeller production. The process comprises the following steps: S100, obtaining a blank through casting, the blank comprising a disc, a hub and a plurality of blades extending from the disc; during the casting process, process ribs are arranged between adjacent blades, one end of the process rib is connected to the outer circumferential surface of the disc, and the other end of the process rib is connected to the end of the blade; the process rib, the outer circumferential surface of the disc and the surface of the adjacent blade jointly form a triangular gap; S200, clamping the blades of the blank, and turning the outer circle of the hub to make it reach a predetermined size; S300, clamping the hub after turning, and turning the circumferential surface formed by the edges of the plurality of blades to ensure that the circumferential surface meets the design requirements; and S400, removing the process rib to obtain the impeller. The open-type slag slurry pump impeller production process provided by the application can improve the production quality and the yield of the impeller.

Description

Technical Field

[0001] This application relates to the field of impeller manufacturing technology, and more specifically, to a manufacturing process for an open slurry pump impeller. Background Technology

[0002] In the industrial sector, slurry pumps are widely used in mining, metallurgy, and power industries to transport high-concentration slurries containing solid particles. High-chromium cast iron (such as A05V) is an ideal material for manufacturing impellers of open slurry pumps due to its excellent wear resistance and corrosion resistance. However, the properties of high-chromium cast iron also bring many challenges to impeller production.

[0003] During the machining of the impeller blank, the outer diameters of the hub and the impeller need to be turned separately. When turning the hub's outer diameter with blades clamped, the number of blades corresponding to the tool's feed direction is constantly changing due to the impeller's rotation; it may be one or more. When the feed direction corresponds to only one blade, that blade will bear most of the cutting force. Compared to the situation where two or more blades share the force, the stress on a single blade is greater, which can easily cause the relatively fragile end plate of the blade to crack, leading to product scrap.

[0004] The problem is equally severe when machining the circumferential surface formed by the blade edges. When clamping the hub to machine the outer diameter of the blades, the high-chromium cast iron impeller lacks sufficient rigidity. Under repeated cutting forces, the blades are prone to elastic deformation and vibration. This vibration not only affects machining accuracy, leading to dimensional deviations in the impeller's outer diameter, but also generates fatigue stress at the blade tips, ultimately causing microcracks. Furthermore, due to the extremely poor weldability of high-chromium cast iron, once cracks appear, they are difficult to repair using conventional welding techniques. These microcracks not only weaken the structural strength of the blades and shorten the impeller's service life, but may also rapidly expand during high-speed operation of the slurry pump, leading to blade breakage and severely impacting the quality of the open slurry pump impeller.

[0005] Currently, there is no mature and effective solution to the aforementioned problems encountered in the machining of high-chromium cast iron open slurry pump impellers. Therefore, it is urgent to develop a manufacturing process for open slurry pump impellers to overcome the technical difficulties of micro-cracks and fractures easily generated during the machining of high-chromium cast iron open impellers, and to improve the production quality and yield of impellers. Summary of the Invention

[0006] The purpose of this application is to provide an open slurry pump impeller manufacturing process that addresses the aforementioned problems, thereby improving the impeller's production quality and yield, and thus alleviating the problems.

[0007] This application is achieved through the following technical solution:

[0008] This application provides a manufacturing process for an open slurry pump impeller, comprising: S100: obtaining a blank with process ribs between the blades and the impeller by casting; S200: clamping the blades of the blank and turning the outer circle of the hub to achieve a predetermined size; S300: re-clamping the blank after hub turning, clamping the hub, and turning the circumferential surface formed by the edges of multiple blades to ensure that the circumferential surface meets the design requirements; S400: removing the process ribs to obtain the impeller; wherein, one end of the process rib is connected to the outer circumferential surface of the impeller, and the other end is connected to the end of the blade; the process rib, the outer circumferential surface of the impeller, and the blade form a triangular gap.

[0009] In the technical solution of this application embodiment, the process first enters the S100 casting stage. A process rib is set between the blade and the wheel disk. One end of the process rib connects to the outer circumference of the wheel disk, and the other end connects to the blade end (the end is the most vulnerable and least stable part of the blade), directly forming a support structure for the blade end plate, creating a triangular pore structure and constructing a stable mechanical framework. After clamping the blade in the S200 turning of the outer diameter of the hub, the process rib acts like a bracket, enhancing the structural strength of the blade end plate. When the blank rotates, causing a single blade to bear cutting force, the process rib can disperse stress, reducing the local stress value on the end plate and effectively preventing the end plate from cracking due to excessive force. This eliminates the risk of product scrapping of the high-chromium cast iron impeller in this processing stage and effectively prevents the blade end plate from cracking. After completing the turning of the outer diameter of the hub, the hub is re-clamped during the S300 turning of the blade edge circumference. The process rib continues to provide support for the blade end plate, further enhancing the overall rigidity of the blade. The process ribs, by stabilizing the blade end plates, effectively suppress the elastic deformation and vibration amplitude of the blades under cutting forces, reduce fatigue stress accumulation at the blade tips, and lower the probability of microcrack formation. Given the extremely poor weldability of high-chromium cast iron, making repair by welding difficult, this process, by preventing microcracks, ensures the structural strength of the impeller, extends its service life, and improves impeller production quality and yield. Finally, the process ribs are removed using S400 to obtain a qualified impeller without affecting the final shape and structure of the machined impeller.

[0010] In some embodiments, prior to S200, the process further includes S110: installing a support mechanism onto a blank; wherein the support mechanism includes a plurality of support members; both ends of the support members abut against the opposite surfaces of two adjacent blades respectively; the contact position between the support members and the blades is close to the end of the blades; the contact position between the support members and the blades is offset from the orthographic projection of the process ribs on the blades.

[0011] In the technical solution of this application embodiment, the thickness of the blade exceeds the thickness of the wheel disk, while the thickness of the process rib does not exceed the thickness of the outer circumferential surface of the wheel disk. Therefore, the thickness of the blade also exceeds the thickness of the process rib. The support effect of the process rib on the part of the blade that exceeds itself is weak. To solve the problem that this part of the blade is easily damaged, before entering the S200 process of clamping the blank blade and turning the outer diameter of the hub, the support mechanism is first installed on the blank. The two ends of the multiple support members of the support mechanism abut against the opposite surfaces of adjacent blades and are close to the blade ends, while avoiding the orthogonal projection of the process rib on the blade. After installation, the S200 process is performed, at which time the blade is clamped and the outer diameter of the hub is turned. The support members can enhance the mutual support force between adjacent blades, forming a double guarantee with the support of the process rib on the blade end plate. When a blade is subjected to cutting force, the support members can distribute part of the force to adjacent blades, and the process rib also disperses the stress simultaneously, greatly reducing the force on a single blade and effectively preventing the blade end plate from cracking. After completing the outer diameter turning of the hub, when entering the S300 clamping and turning of the blade edge circumference, the support mechanism and process ribs continue to work together to further improve the overall rigidity of the impeller, greatly reduce the elastic deformation and vibration of the blade caused by the cutting force, reduce the fatigue stress at the blade tip, more effectively avoid the generation of micro-cracks, ensure the structural strength and machining accuracy of the impeller, and improve the yield and service life of the impeller.

[0012] In some embodiments, the support mechanism further includes a connecting ring; a support member is connected to the connecting ring; a plurality of support members are arranged circumferentially around the axis of the connecting ring; and the axis of the connecting ring is coaxial with the axis of the hub.

[0013] In the technical solution of this application embodiment, when installing the support mechanism onto the blank, a connecting ring with multiple support members is installed onto the impeller blank, ensuring that the axis of the connecting ring is coaxial with the axis of the hub. Multiple support members are arranged circumferentially around the axis of the connecting ring, and both ends of the support members abut against the adjacent blade surfaces near their ends. In the S200 blade clamping and hub outer diameter turning process, the connecting ring acts as a carrier for the support members, enabling multiple support members to be stably and evenly distributed among the blades, forming a ring-shaped support frame. When the blade is subjected to cutting force, the connecting ring assists the support members in distributing the force more evenly throughout the impeller, avoiding excessive local stress. Simultaneously, the connecting ring, support members, and process ribs work together to further enhance the overall rigidity of the impeller. In the S300 hub clamping and blade edge circumferential surface turning process, the connecting ring ensures the support members are fixed in position, continuously and stably providing support for the blade, weakening elastic deformation and vibration caused by cutting force, reducing fatigue stress at the blade ends, and preventing micro-cracks, thereby improving the impeller machining quality and yield. Furthermore, the connecting ring can simultaneously install multiple support components onto or remove them from the blank, thus accelerating the production efficiency of the impeller.

[0014] In some embodiments, the connecting ring is provided with a guide groove extending along the extension direction of the blade; the orthographic projection of the support member in the thickness direction of the connecting ring is circular; the support member moves along the guide groove from the side near the end of the blade toward the side near the root of the blade until the outer peripheral surface of the support member abuts against the opposing surfaces of two adjacent blades.

[0015] In the technical solution of this application embodiment, during the installation of the support mechanism, the connecting ring with the guide groove is first installed onto the impeller blank, ensuring that the axis of the connecting ring is coaxial with the axis of the hub. The installer pushes the support member along the guide groove from the side near the blade tip to the side near the blade root. As the support member moves, its circular outer circumferential surface gradually comes into contact with the opposing surfaces of two adjacent blades. This application, through the design of the guide groove and the specifically shaped support member, provides more precise and reliable support for impeller machining.

[0016] In some embodiments, the support is rotatably connected to the connecting ring; the connecting ring rotates so that its two ends abut against the opposing surfaces of two adjacent blades.

[0017] In the technical solution of this application embodiment, when installing the support mechanism, the connecting ring with the rotatable support is first installed onto the impeller blank, ensuring that the axis of the connecting ring is coaxial with the axis of the hub. Since the support is rotatably connected to the connecting ring, the installer can rotate the connecting ring so that both ends of the connecting ring can fit against the opposing surfaces of two adjacent blades and abut against each other. This allows the connecting ring to adapt to the surface of blades whose dimensions may have deviations, and fit against them.

[0018] In some embodiments, the support includes a pair of movable portions and an elastic portion; the elastic portion is connected between the pair of movable portions; the elastic portion pushes the pair of movable portions to abut against the opposing surfaces of two adjacent blades.

[0019] In the technical solution of this application embodiment, when installing the support mechanism, the operator pushes the elastic support between adjacent blades. The pre-compression state of the elastic part causes a pair of moving parts to generate an outward expanding thrust, ensuring that the moving parts and the blade surface always maintain close contact. When the blade is subjected to cutting force during turning, the elastic part absorbs and disperses stress through deformation, avoiding local stress concentration. For example, when subjected to force on one side, the elastic part can transmit the force to adjacent blades through asymmetrical compression, forming a synergistic support effect. When turning the outer diameter of the blade in S300, the elastic support continuously plays a dynamic adjustment role. When the blade undergoes slight elastic deformation due to cutting force, the elastic part compensates for the deformation through adaptive expansion and contraction, maintaining a stable support force. This real-time dynamic adjustment mechanism significantly suppresses the vibration amplitude of the blade, controls the vibration frequency during the machining process within a safe threshold, and effectively avoids the generation of microcracks. In addition, through the elastic damping effect, the support can absorb cutting vibration energy, keeping the blade amplitude within a small range. This vibration suppression capability can improve the machining accuracy of the impeller outer diameter.

[0020] In some embodiments, the support further includes a sleeve; a portion of the movable part is located inside the sleeve; the movable part fits against the inner wall of the sleeve; an elastic part is located inside the sleeve; and the sleeve is fixedly connected to the connecting ring.

[0021] In the technical solution of this application embodiment, when installing the support mechanism, the operator aligns the sleeve-type support fixed on the connecting ring with the gap between adjacent blades. Under the preload of the elastic part, the movable part slides outward along the inner wall of the sleeve until it is tightly fitted against the blade surface. The constraint of the sleeve ensures that the movable part can only move axially, avoiding support failure caused by lateral displacement. During turning, when the blade is subjected to cutting force, the movable part transmits the force to the sleeve, and then distributes it to the entire support system through the connecting ring. For example, when subjected to force on one side, the contact surface between the inner wall of the sleeve and the movable part generates friction, suppressing the lateral sway of the movable part and causing the deformation of the elastic part to mainly occur in the axial direction, thereby more effectively absorbing and dispersing stress. When turning the outer diameter of the blade with an S300 milling machine, due to the radial constraint of the sleeve on the movable part, even under high-speed cutting conditions, the movable part can maintain stable contact with the blade surface. This stable support state effectively reduces fatigue stress at the blade tip and lowers the incidence of microcracks.

[0022] In some embodiments, the surface of the movable part facing the blade is an inclined surface; the distance between the surface of the movable part facing the blade and the elastic part gradually decreases from the connecting ring to the wheel.

[0023] In the technical solution of this application embodiment, when installing the support mechanism, a support member with a sloping movable part is installed onto the connecting ring and placed between adjacent blades. The preload of the elastic part pushes the movable part to extend outward. Since the surface of the movable part facing the blade is sloping, as the movable part moves, the sloping surface gradually comes into contact with the blade surface. The sloping surface allows the support member to enter between adjacent blades more easily, reducing the installation difficulty of the support member. The tangential component force generated by the sloping structure creates a "wedge-like" effect between the movable part and the blade. When the cutting force fluctuates, the movable part is less likely to slip or detach, maintaining stable contact with the blade, further reducing the blade vibration amplitude and improving the impeller machining accuracy. The sloping surface of the movable part cooperates with the elastic part. When the blade is under force, the deformation of the elastic part and the force decomposition of the sloping surface work together to more efficiently absorb and disperse the energy generated by the cutting force, reduce the accumulation of fatigue stress at the blade tip, and reduce the possibility of microcracks.

[0024] In some embodiments, the connecting ring is provided with a directional groove; a pair of moving parts move along the directional groove to move closer to or further away from each other.

[0025] In the technical solution of this application embodiment, when the blade is subjected to cutting force, the movable parts, constrained by the directional groove, will only move closer or further apart along the direction of the directional groove. This ensures that the movable parts maintain the correct direction of movement during changes in cutting force, preventing support failure due to displacement of the movable parts and stably suppressing the elastic deformation and vibration of the blade. The directional groove ensures that the movable parts will not sway or misalign, maintaining stable contact between the support and the blade.

[0026] In some embodiments, the angle between the process rib and the outer peripheral surface of the wheel towards the blade is α; satisfying 90°>α>0.

[0027] In the technical solution of this application embodiment, when 90° > a > 0, in the S300 turning of the blade edge circumferential surface, the cutting force can be decomposed into a radial force that bends the blade and a tangential force that causes the blade to slide. The process rib forms a certain angle with the outer circumferential surface of the impeller. This special structure allows the force generated in the length direction to specifically counteract the cutting force. When the radial force attempts to bend the blade, the tensile or supporting force generated by the process rib along its own length direction can apply a reverse force from the oblique direction, just like pulling or supporting the blade in the inclined direction, offsetting the bending tendency caused by the radial force; facing the risk of blade sliding caused by the tangential force, the force in the length direction of the process rib can also form a resistance in the side, hindering the blade from sliding, thereby effectively reducing the deformation and vibration of the blade during the machining process, and ensuring the machining accuracy and quality of the impeller.

[0028] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 Flowcharts of the manufacturing process of open slurry pump impellers provided for some embodiments of this application;

[0031] Figure 2 Flowcharts of the manufacturing process for open slurry pump impellers provided for other embodiments of this application;

[0032] Figure 3 This is a schematic diagram of the structure of the blank provided in some embodiments of this application;

[0033] Figure 4 A schematic diagram illustrating the fit between the blank and the support mechanism provided in some embodiments of this application;

[0034] Figure 5 This is a schematic diagram of the structure of the blank and the support member in some embodiments of this application;

[0035] Figure 6 This is a schematic diagram of the structure of the blank and the support member in some other embodiments of this application;

[0036] Figure 7 A schematic diagram of the structure of the blank and the support member in some embodiments of this application;

[0037] Figure 8 A schematic diagram illustrating the fit between the blank and the support mechanism in other embodiments of this application;

[0038] Figure 9 Partial cross-sectional view of the support mechanism provided for some embodiments of this application;

[0039] Figure 10 Schematic diagrams of the support mechanism provided in some embodiments of this application;

[0040] Figure 11 This is a schematic diagram of the impeller structure provided for some embodiments of this application.

[0041] Icons: 1-blade; 2-disc; 3-process rib; 4-hub; 5-support mechanism; 50-support component; 500-moving part; 501-elastic part; 502-sleeve; 51-connecting ring; 510-guide groove; 511-direction limiting groove. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0044] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0046] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0048] According to some embodiments of this application, optionally, such as Figure 1 , Figure 3 and Figure 11 As shown, this application provides a manufacturing process for an open slurry pump impeller, which includes: S100: obtaining a blank with process ribs 3 between the blades 1 and the impeller 2 by casting; S200: clamping the blank blades 1 and turning the outer circle of the hub 4 to achieve a predetermined size; S300: re-clamping the blank after turning the hub 4, clamping the hub 4, and turning the circumferential surface formed by the edges of multiple blades 1 to ensure that the circumferential surface meets the design requirements; S400: removing the process ribs 3 to obtain the impeller; wherein, one end of the process rib 3 is connected to the outer circumferential surface of the impeller 2, and the other end is connected to the end of the blade 1; the process rib 3, the outer circumferential surface of the impeller 2, and the blade 1 form a triangular gap.

[0049] The size of the end of the process rib 3 that connects to the blade 1 can be smaller than the size of the end of the process rib 3 that connects to the outer circumferential surface of the wheel 2. On the one hand, this allows the end of the process rib 3 that connects to the blade 1 to be removed more quickly when it is removed, thereby reducing the vibration caused to the end of the blade 1 during the removal of the process rib 3 and reducing the risk of microcracks in the blade 1 due to vibration. On the other hand, allowing the size of the end of the process rib 3 that connects to the outer circumferential surface of the wheel 2 to be larger can provide a stable and reliable support force for the end of the blade 1.

[0050] The thickness of the process rib 3 is the same as the width of the outer circumference of the wheel 2, so that the process rib 3 is as thick as possible while reducing the molding difficulty of the process rib 3.

[0051] The impeller produced in this application is made of high-chromium cast iron. High-chromium cast iron has high strength and corrosion resistance, but it also has the characteristics of being brittle, having poor weldability and poor toughness.

[0052] The process rib 3 can be placed in the mold for forming the blank as an insert, thereby avoiding the situation where the forming liquid cannot fill the relatively narrow forming cavity of the process rib 3, resulting in insufficient strength or even absence of the formed process rib 3.

[0053] When removing process rib 3 in S400, it should be done after the overall machining accuracy and dimensional stability of the impeller have met the requirements (i.e., after dynamic balancing correction is completed). Removing it too early may lead to a decrease in the structural strength of the impeller and affect the subsequent machining accuracy; removing it too late may increase the difficulty of removal due to the deformation of process rib 3 under stress during the machining process.

[0054] In practical applications, the process first enters the S100 casting stage. A process rib 3 is placed between the blade 1 and the wheel disk 2. One end of the process rib 3 connects to the outer circumference of the wheel disk 2, and the other end connects to the end of the blade 1 (the end being the most vulnerable and least stable part of the blade 1). This directly forms a support structure for the end plate of the blade 1, creating a triangular pore structure and constructing a stable mechanical framework. After clamping the blade 1 in the S200 turning of the outer diameter of the hub 4, the process rib 3 acts as a support, enhancing the structural strength of the end plate of the blade 1. When the blank rotates, causing a single blade 1 to bear cutting force, the process rib 3 can disperse stress, reducing the local stress value on the end plate and effectively preventing the end plate from cracking due to excessive force. This eliminates the risk of product scrapping of the high-chromium cast iron impeller in this processing stage and effectively prevents the end plate of the blade 1 from cracking. After completing the turning of the outer diameter of the hub 4, the hub 4 is re-clamped during the S300 turning of the edge circumference of the blade 1. The process rib 3 continues to provide support for the end plate of the blade 1, further enhancing the overall rigidity of the blade 1. Process rib 3, by stabilizing the end plate of blade 1, effectively suppresses the elastic deformation and vibration amplitude of blade 1 under cutting force, reduces the accumulation of fatigue stress at the tip of blade 1, and lowers the probability of microcrack formation. Given the extremely poor weldability of high-chromium cast iron, making repair by welding difficult, this process, by preventing microcracks, ensures the structural strength of the impeller, extends its service life, and improves impeller production quality and yield. Finally, process rib 3 is removed in S400 to obtain a qualified impeller without affecting the shape and structure of the finished impeller.

[0055] According to some embodiments of this application, optionally, such as Figure 2 , Figures 4-8 As shown, before S200, the process also includes S110: installing the support mechanism 5 onto the blank; wherein, the support mechanism 5 includes a plurality of support members 50; the two ends of the support members 50 respectively abut against the opposite surfaces of two adjacent blades 1; the contact position of the support members 50 with the blades 1 is close to the end of the blades 1; the contact position of the support members 50 with the blades 1 is offset from the orthographic projection of the process rib 3 on the blades 1.

[0056] The contact positions of two adjacent support members 50 on the same blade 1 can be opposite each other with the blade 1 as the center, so that the forces applied by the two support members 50 to the blade 1 can be on the same straight line and in opposite directions, so as to abut against each other.

[0057] The support mechanism 5 can be a replaceable modular structure, allowing for rapid assembly of a suitable support system according to different specifications and models of impellers. This improves production efficiency while reducing the research and development and production costs of the support mechanism 5, facilitating its widespread application in the production of various open slurry pump impellers.

[0058] Support mechanism 5 can be removed from the blank after S300.

[0059] The thickness of blade 1 exceeds that of disk 2, while the thickness of process rib 3 does not exceed the thickness of the outer circumferential portion of disk 2. Therefore, the thickness of blade 1 also exceeds that of process rib 3. The support effect of process rib 3 on the portion of blade 1 that exceeds itself is weak. To address the issue of this part of blade 1 being easily damaged, before entering the S200 process of clamping the blank blade 1 and turning the outer diameter of the hub 4, the support mechanism 5 is first installed on the blank. The multiple support members 50 of the support mechanism 5 abut against the opposite surfaces of adjacent blades 1 at both ends, close to the ends of blades 1, while avoiding the orthographic projection of process rib 3 on blade 1. After installation, the S200 process is performed, at which point the blade 1 is clamped and the outer diameter of the hub 4 is turned. The support members 50 can enhance the mutual support force between adjacent blades 1, forming a double guarantee with the support of process rib 3 on the end plate of blade 1. When a blade 1 is subjected to cutting force, the support member 50 can distribute part of the force to adjacent blades 1, and the process rib 3 also disperses the stress simultaneously, significantly reducing the force on a single blade 1 and effectively preventing the end plate of blade 1 from cracking. After completing the outer diameter turning of hub 4, when entering the S300 clamping process for turning the edge circumferential surface of blade 1, the support mechanism 5 and the process rib 3 continue to work together to further improve the overall rigidity of the impeller, greatly reduce the elastic deformation and vibration of blade 1 caused by the cutting force, reduce the fatigue stress at the tip of blade 1, more effectively avoid the generation of micro-cracks, ensure the structural strength and machining accuracy of the impeller, and improve the yield and service life of the impeller.

[0060] According to some embodiments of this application, optionally, such as Figure 4 , Figures 8-10 As shown, the support mechanism 5 also includes a connecting ring 51; support members 50 are connected to the connecting ring 51; multiple support members 50 are arranged around the axis of the connecting ring 51; the axis of the connecting ring 51 is coaxial with the axis of the hub 4.

[0061] The support component 50 can be detachably connected to the connecting ring 51. The appropriate support component 50 can be selected and replaced according to the structure, model, number and size of the impeller blades 1. Moreover, when a support component 50 is damaged, a new and intact support component 50 can be replaced relatively quickly to avoid affecting the production process.

[0062] When installing the support mechanism 5 onto the blank, a connecting ring 51 with multiple support members 50 is installed onto the impeller blank, ensuring that the axis of the connecting ring 51 is coaxial with the axis of the hub 4. Multiple support members 50 are arranged circumferentially around the axis of the connecting ring 51, with both ends of each support member 50 abutting against the opposite surfaces of adjacent blades 1 near their ends. In the S200 step of clamping the blades 1 and turning the outer diameter of the hub 4, the connecting ring 51 acts as a carrier for the support members 50, allowing the multiple support members 50 to be stably and evenly distributed between the blades 1, forming a ring-shaped support frame. When the blades 1 are subjected to cutting force, the connecting ring 51 assists the support members 50 in distributing the force more evenly throughout the impeller, avoiding excessive local stress. Simultaneously, the connecting ring 51, together with the support members 50 and the process ribs 3, further enhances the overall rigidity of the impeller. When the S300 clamping hub 4 is used to turn the edge circumferential surface of the blade 1, the connecting ring 51 ensures that the support member 50 is fixed in position, continuously and stably providing support for the blade 1, reducing elastic deformation and vibration caused by cutting force, reducing fatigue stress at the blade 1 tip, and avoiding the generation of microcracks, thereby improving the impeller machining quality and yield. Furthermore, the connecting ring 51 can simultaneously install multiple support members 50 onto or remove them from the blank, accelerating the impeller production efficiency.

[0063] According to some embodiments of this application, optionally, such as Figures 4-5 As shown, the connecting ring 51 is provided with a guide groove 510 extending along the extension direction of the blade 1; the support member 50 is circular in the thickness direction of the connecting ring 51; the support member 50 moves along the guide groove 510 from the side near the end of the blade 1 toward the side near the root of the blade 1 until the outer peripheral surface of the support member 50 abuts against the opposite surfaces of the two adjacent blades 1.

[0064] The width of the guide groove 510 is slightly larger than the size of the support member 50 located inside it, allowing the support member 50 to move along the width direction of the guide groove 510 to adjust the distance between itself and the two adjacent blades 1.

[0065] A layer of soft, wear-resistant material, such as silicone rubber or polyurethane, can be applied to the outer periphery of the support member 50. The material needs to have good wear resistance and friction reduction properties to ensure the support effect and prevent the support member 50 from scratching the surface of the blade 1.

[0066] When installing the support mechanism 5, first install the connecting ring 51 with the guide groove 510 onto the impeller blank, ensuring that the axis of the connecting ring 51 is coaxial with the axis of the hub 4. The installer pushes the support member 50 along the guide groove 510 from the side near the end of the blade 1 to the side near the root of the blade 1. As the support member 50 moves, its circular outer circumferential surface gradually comes into contact with the opposing surfaces of the two adjacent blades 1. This application, through the design of the guide groove 510 and the specifically shaped support member 50, provides more precise and reliable support for impeller machining.

[0067] According to some embodiments of this application, optionally, such as Figure 6 As shown, the support member 50 is rotatably connected to the connecting ring 51; the connecting ring 51 rotates so that its two ends abut against the opposite surfaces of two adjacent blades 1.

[0068] The surfaces at both ends of the support member 50 can be coated with an elastic coating. When it comes into contact with the blade 1, the surface material of the support member 50 can undergo slight deformation according to the shape of the blade 1 and the stress conditions, so as to achieve a tighter fit, increase the effective support area, disperse local stress, and improve the support effect and the protection capability of the blade 1.

[0069] When installing the support mechanism 5, first install the connecting ring 51 with the rotatable support 50 onto the impeller blank, ensuring that the axis of the connecting ring 51 is coaxial with the axis of the hub 4. Since the support 50 is rotatably connected to the connecting ring 51, the installer can rotate the connecting ring 51 so that both ends of the connecting ring 51 can fit against and abut against the opposing surfaces of two adjacent blades 1. This allows the connecting ring 51 to adapt to and fit against the surface of the blades 1, even if their dimensions may deviate.

[0070] According to some embodiments of this application, optionally, such as Figures 7-10 As shown, the support member 50 includes a pair of movable parts 500 and an elastic part 501; the elastic part 501 is connected between the pair of movable parts 500; the elastic part 501 pushes the pair of movable parts 500 to abut against the opposite surfaces of two adjacent blades 1.

[0071] Multiple support members 50 can be provided between two adjacent blades 1, and the stiffness of the multiple support members 50 gradually increases from the end near the end of the blade 1 to the end near the root of the blade 1, so that the support members 50 can play a supporting role while their own stiffness will not damage the blade 1.

[0072] When installing the support mechanism 5, the operator pushes the elastic support 50 between adjacent blades 1. The pre-compression state of the elastic part 501 causes a pair of movable parts 500 to generate an outward expanding thrust, ensuring that the movable parts 500 and the surface of the blade 1 always maintain close contact. When the blade 1 is subjected to cutting force during turning, the elastic part 501 absorbs and disperses stress through deformation, avoiding local stress concentration. For example, when subjected to force on one side, the elastic part 501 can transmit the force to the adjacent blade 1 through asymmetrical compression, forming a synergistic support effect. When turning the outer diameter of the blade 1 in S300, the elastic support 50 continuously plays a dynamic adjustment role. When the blade 1 undergoes slight elastic deformation due to cutting force, the elastic part 501 compensates for the deformation through adaptive expansion and contraction, maintaining a stable support force. This real-time dynamic adjustment mechanism significantly suppresses the vibration amplitude of the blade 1, controls the vibration frequency during the machining process within a safe threshold, and effectively avoids the generation of microcracks. In addition, through the elastic damping effect, the support 50 can absorb cutting vibration energy, keeping the amplitude of the blade 1 within a small range. This vibration suppression capability can improve the machining accuracy of the impeller's outer diameter.

[0073] According to some embodiments of this application, optionally, such as Figures 7-10 As shown, the support member 50 also includes a sleeve 502; a portion of the movable part 500 is located inside the sleeve 502; the movable part 500 is in contact with the inner wall of the sleeve 502; the elastic part 501 is located inside the sleeve 502; and the sleeve 502 is fixedly connected to the connecting ring 51.

[0074] The movable part 500 can be fully retracted into the sleeve 502, or a stepped surface is formed between a part of the movable part 500 that cannot be retracted into the sleeve 502 and a part that can enter the sleeve 502. The stepped surface can seal the opening of the sleeve 502 to prevent chips and coolant from entering.

[0075] When the movable part 500 can be fully retracted into the sleeve 502, the end of the sleeve 502 can be provided with an openable and closable sealing lip. When the movable part 500 extends, the sealing lip opens, and when it retracts, the sealing lip closes to prevent chips and coolant from entering.

[0076] When installing the support mechanism 5, the operator aligns the sleeve 502 type support 50, fixed on the connecting ring 51, with the gap between adjacent blades 1. Under the preload of the elastic part 501, the movable part 500 slides outward along the inner wall of the sleeve 502 until it is tightly fitted against the surface of the blade 1. The constraint of the sleeve 502 ensures that the movable part 500 can only move axially, avoiding support failure caused by lateral displacement. During turning, when the blade 1 is subjected to cutting force, the movable part 500 transmits the force to the sleeve 502, which is then distributed to the entire support system through the connecting ring 51. For example, under unilateral force, the friction between the inner wall of the sleeve 502 and the contact surface of the movable part 500 generates friction, suppressing the lateral sway of the movable part 500 and causing the deformation of the elastic part 501 to mainly occur in the axial direction, thereby more effectively absorbing and dispersing stress. When turning the outer diameter of blade 1 with an S300 milling machine, the sleeve 502 provides radial constraint to the moving part 500, ensuring stable contact between the moving part 500 and the surface of blade 1 even under high-speed cutting conditions. This stable support effectively reduces fatigue stress at the tip of blade 1 and lowers the incidence of microcracks.

[0077] According to some embodiments of this application, optionally, such as Figure 9 As shown, the surface of the movable part 500 facing the blade 1 is inclined; the distance between the surface of the movable part 500 facing the blade 1 and the elastic part 501 gradually decreases from the connecting ring 51 to the wheel 2.

[0078] The inclination angle of the inclined plane is in the range of 15°-30°. If the angle is too large, the vertical component of the supporting force may be insufficient, and if the angle is too small, the tangential component of the force will not be obvious.

[0079] When installing the support mechanism 5, the support member 50 with the inclined movable part 500 is installed onto the connecting ring 51 and placed between adjacent blades 1. The preload of the elastic part 501 pushes the movable part 500 to extend outward. Since the surface of the movable part 500 facing the blade 1 is inclined, as the movable part 500 moves, the inclined surface gradually comes into contact with the surface of the blade 1. The inclined surface makes it easier for the support member 50 to enter between adjacent blades 1, reducing the installation difficulty of the support member 50. The tangential component force generated by the inclined surface structure creates a "wedge-like" effect between the movable part 500 and the blade 1. When the cutting force fluctuates, the movable part 500 is less likely to slip or detach, maintaining stable contact with the blade 1, further reducing the vibration amplitude of the blade 1 and improving the impeller machining accuracy. The inclined surface of the movable part 500 cooperates with the elastic part 501. When the blade 1 is under force, the deformation of the elastic part 501 and the force decomposition of the inclined surface work together to more efficiently absorb and disperse the energy generated by the cutting force, reduce the accumulation of fatigue stress at the tip of the blade 1, and reduce the possibility of microcracks.

[0080] According to some embodiments of this application, optionally, such as Figure 8As shown, the connecting ring 51 is provided with a directional groove 511; a pair of movable parts 500 move along the directional groove 511 to move closer to or further away from each other.

[0081] The movable part 500 can be equipped with balls or rollers that cooperate with the directional groove 511, so that the movable part 500 and the directional groove 511 can roll together, reducing frictional resistance and improving the smoothness of the movement of the movable part 500.

[0082] When blade 1 is subjected to cutting force, the movable parts 500, constrained by the directional groove 511, will only move closer or further apart along the direction of the directional groove 511. This ensures that the movable parts 500 maintain the correct direction of movement during changes in cutting force, preventing support failure due to offset of the movable parts 500 and stably suppressing the elastic deformation and vibration of blade 1. The directional groove 511 ensures that the movable parts 500 will not sway or misalign, maintaining stable contact between the support member 50 and blade 1.

[0083] According to some embodiments of this application, optionally, such as Figure 3 As shown, the angle between the process rib 3 and the outer peripheral surface of the wheel 2 toward the blade 1 is a; satisfying 90°>a>0.

[0084] When a=45°, the process rib 3 has the best effect on decomposing the cutting force.

[0085] When 90° > a > 0, in the S300 turning of the edge circumferential surface of blade 1, the cutting force can be decomposed into a radial force that causes blade 1 to bend and a tangential force that causes blade 1 to slide. The process rib 3 forms a certain angle with the outer circumferential surface of the impeller 2. This special structure allows the force generated in the length direction to specifically counteract the cutting force. When the radial force attempts to bend blade 1, the tensile or supporting force generated by the process rib 3 along its own length direction can apply a reverse force from the oblique direction, just like pulling or supporting blade 1 in the inclined direction, thus counteracting the bending tendency caused by the radial force. Faced with the risk of blade 1 sliding caused by the tangential force, the force in the length direction of the process rib 3 can also form a lateral resistance, preventing blade 1 from sliding, thereby effectively reducing the deformation and vibration of blade 1 during the machining process and ensuring the machining accuracy and quality of the impeller.

[0086] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An open impeller production process for a slurry pump, characterized by, The method comprises the following steps: S100: obtaining a blank by casting, the blank comprising a disc, a hub and a plurality of blades extending from the disc; During the casting process, a process rib is arranged between adjacent blades, one end of the process rib being connected to the outer circumferential surface of the disc and the other end being connected to the end of the blade; the process rib, the outer circumferential surface of the disc and the surface of the adjacent blade together form a triangular gap; S110: installing a supporting mechanism to the blank; S200: clamping the blades of the blank, and turning the outer circle of the hub to a predetermined size; S300: clamping the hub after turning, and turning the circumferential surface formed by the edges of the plurality of blades to ensure that the circumferential surface meets the design requirements; S400: removing the process rib to obtain the impeller; The supporting mechanism comprises a plurality of supporting pieces; The two ends of the supporting piece are respectively in abutment with the opposite surfaces of two adjacent blades; The contact position of the supporting piece with the blade is close to the end of the blade; The abutment position of the supporting piece on the blade avoids the orthogonal projection of the process rib on the blade.

2. A process for producing an open impeller of a slurry pump according to claim 1, characterized in that, The supporting mechanism further comprises a connecting ring; The plurality of supporting pieces are circumferentially arranged around the axis of the connecting ring, and the supporting pieces are connected to the connecting ring; The axis of the connecting ring is coaxial with the axis of the hub.

3. A process for producing an open impeller of a slurry pump according to claim 2, characterized in that, The connecting ring is provided with a guide groove extending along the extension direction of the blade; The orthogonal projection of the supporting piece in the thickness direction of the connecting ring is circular; The supporting piece moves along the guide groove from the side close to the end of the blade to the side close to the root of the blade until the outer circumferential surface of the supporting piece is in abutment with the opposite surfaces of the two adjacent blades.

4. A process for producing an open impeller of a slurry pump according to claim 2, characterized in that, The supporting piece is rotatably connected to the connecting ring; The connecting ring rotates to make its two ends in abutment with the opposite surfaces of the two adjacent blades.

5. A process for producing an open impeller of a slurry pump according to claim 2, characterized in that, The supporting piece comprises a pair of movable parts and an elastic part; The elastic part is connected between the pair of movable parts and pushes the pair of movable parts to be in abutment with the opposite surfaces of the two adjacent blades.

6. A process for producing an open impeller of a slurry pump according to claim 5, characterized in that, The supporting piece further comprises a sleeve; The sleeve is fixedly connected to the connecting ring; A part of the movable part is located inside the sleeve and is in sliding fit with the inner wall of the sleeve; The elastic part is located inside the sleeve.

7. A process for producing an open impeller of a slurry pump according to claim 5, characterized in that, The surface of the movable part facing the blade is beveled; The distance between the surface of the movable part facing the blade and the elastic part gradually decreases from the connecting ring to the disc.

8. A process for producing an open impeller of a slurry pump according to claim 5, characterized in that, The connecting ring is provided with a limiting groove; The pair of movable parts move along the limiting groove to move closer to or away from each other.

9. A process for producing an open impeller of a slurry pump according to any one of claims 1 to 8, characterized in that, The included angle between the process rib and the outer circumferential surface of the disc towards the blade is a; 90°>a>0.

Images