Impeller module assembly jig and impeller module assembly method

Abstract

The application discloses a kind of impeller module combination clamps and impeller module combination method, comprising: support base plate, center support group, side support group and three groups of outer side support group.Center support group is used to install support cross runner front section wax module combination, three bypass filter screen and three cross runner rear section wax mold, and make bypass filter screen connection positioning to cross runner front section wax mold, and make cross runner rear section wax mold connection positioning to bypass filter screen.Side support group is used to clamp straight runner wax mold, so that it is positioned and connected to main filter screen.Outer side support group is used to clamp and support a group of impeller wax mold and riser and stiffener wax mold, and make impeller wax mold positioning and connection to cross runner, and make riser and stiffener wax mold positioning and connection to impeller wax mold.The clamp of the application can improve the dimensional stability and geometric accuracy of castings, reduce the quality fluctuation of castings, and the combination operation is simple and low in difficulty, which can also reduce the dimensional deviation and ensure that each part is not deformed by the pressure of its own weight.

Description

Technical Field

[0001] This invention relates to the field of precision casting technology, and in particular, to a fixture for assembling impeller modules. Furthermore, this invention also relates to a method for assembling impeller modules using a fixture for assembling bottom-pouring gating systems. Background Technology

[0002] Currently, the main method for producing turbine rotor blanks in China is investment casting. This involves creating a wax model, then encasing it layer by layer with refractory material and drying it to form a mold shell with specific structural dimensions. The turbine rotor casting is then poured into the mold using a vacuum melting furnace. Throughout the production process, foreign matter can easily be introduced at any stage, leading to inclusions on the surface and inside the turbine rotor blank. When the turbine rotor operates at high temperatures, the impact of these defects is further amplified, ultimately causing the casting to lose its structural function. Therefore, after casting, the turbine rotor undergoes a series of non-destructive tests, including fluorescent and X-ray inspections, to ensure that the number and size of inclusions are within a controllable range.

[0003] The turbine rotor blank mainly consists of a central hub and several blades radially and evenly distributed on the outer side of the hub. The minimum thickness at the central hub is typically about 10 mm, while the blade exhaust edge thickness is only about 0.4–0.6 mm. To reduce the number of inclusion defects in the impeller rotor blank, a modified wax mold assembly is currently used (this wax mold assembly, after subsequent slurry preparation and casting, and the melting of wax, forms a hollow casting system), as shown in the attached figure. Figure 1 and Figure 2 As shown, it mainly includes a sprue cup wax model 11, a sprue wax model 12, a front section wax model assembly of the runner 13, a main filter screen 14, three bypass filter screens 15, three rear section wax models of the runner 16, three impeller wax models 17, and three sets of risers and reinforcing rib wax models 18. This impeller wax model assembly involves many components, and manual assembly presents the following difficulties: (1) The wax models at the front section of the three bottom horizontal runners and the wax models at the rear section of the horizontal runners 16 need to be evenly distributed at 120° to ensure that the molten metal in the subsequent shell-forming gating system flows evenly and smoothly to each casting. However, when assembling manually, the operator lacks a positioning reference and relies solely on visual inspection and experience to control the angle. Moreover, it requires two people to cooperate - one person holds up the wax model assembly and takes into account the levelness and angle, while the other person assembles and connects it. This not only makes the operation difficult and inefficient, but the angle deviation also directly affects the uniformity of the molten metal flow during subsequent pouring, resulting in fluctuations in the casting quality.

[0004] (2) The sprue wax model 12 must be precisely aligned with the center of the main filter screen 14 to ensure that the molten metal in the subsequent casting system is evenly distributed after filtration. When the sprue wax model is placed manually, without the assistance of a centering structure, the center of the sprue wax model 12 and the main filter screen 14 often show uneven deviations, which cannot ensure vertical concentricity. This not only affects the consistency of the parts, but may also lead to casting defects due to turbulence of the molten metal or a decrease in the filtration effect during subsequent casting.

[0005] (3) The wax mold material has poor rigidity. During manual lifting and assembly, it is prone to deformation under the action of gravity and external force, which increases the risk of cracking and affects the dimensional accuracy of the casting.

[0006] In summary, existing manual assembly methods suffer from problems such as poor positioning accuracy, low efficiency, poor quality consistency, and easy deformation of wax mold modules, making it difficult to meet the needs of mass production. Summary of the Invention

[0007] This invention provides a fixture and assembly method for assembling impeller modules, which solves the problems of poor positioning accuracy, low efficiency, poor quality consistency and easy deformation of wax mold modules in existing manual assembly methods, making it difficult to meet the needs of mass production.

[0008] The technical solution adopted in this invention is as follows: A jig for assembling an impeller module includes: a support base plate, a central support group and side support groups respectively fixedly supported on the support base plate, and three outer support groups supported on the support base plate and disposed around the central support group; the central support group is used to install and support the front section wax mold assembly of the horizontal runner, three bypass filters, and three rear section wax molds of the horizontal runner, and to connect and position the first sides of the three bypass filters to the free ends of the three front section wax molds of the horizontal runner assembly, and to connect and position the first ends of the three rear section wax molds of the horizontal runner to the second sides of the three bypass filters, and the top of the central section of the front section wax mold assembly is used for... The main filter screen is connected and positioned; the side support group is used to vertically clamp the sprue wax model so that the bottom end of the sprue wax model is positioned and connected to the main filter screen at the top of the front section of the sprue wax model assembly, and the top end of the sprue wax model is also used to position and connect the pouring cup wax model; each group of outer support groups is used to clamp and support a set of impeller wax models and a set of riser and reinforcing rib wax models at the corresponding angular positions, and to position and connect the bottom end of the impeller wax model to the second end of the rear section of the lower sprue wax model, and to position and connect the riser and reinforcing rib wax models to the top end of the impeller wax model. The outer support groups are adjustable up and down so that the impeller wax model and riser and reinforcing rib wax models clamped and supported can be released after lowering.

[0009] Furthermore, the central support assembly includes a raised cup fixedly supported at the center of the support base plate, and a positioning base plate that serves as the installation and positioning tool; the top of the raised cup is machined with a concave first positioning hole, and the bottom of the positioning base plate protrudes outward to form a positioning boss. The positioning base plate is positioned and supported on the top of the raised cup after being inserted into the first positioning hole through its positioning boss; the positioning base plate is used to install the positioning wax mold assembly of the front section of the horizontal runner, the three bypass filter screens, and the wax mold of the rear section of the three horizontal runners, respectively.

[0010] Furthermore, the top surface of the positioning base plate is machined with a recessed second positioning hole and three sets of positioning grooves evenly distributed along the outer periphery of the second positioning hole. Each set of positioning grooves includes a first positioning groove, a positioning cavity, and a second positioning groove arranged and connected in a radial direction, and the first positioning groove is also radially connected to the second positioning hole. The second positioning hole and the three first positioning grooves work together to position and install the wax mold assembly of the front section of the horizontal runner. The positioning cavity is used to install the positioning side filter screen, and the second positioning groove is used to install and position the wax mold of the rear section of the horizontal runner.

[0011] Furthermore, the side support assembly includes a vertically arranged column fixedly supported on the positioning base plate, a first support plate vertically fixed to the top of the column to form a cantilever structure, and a latch connected to the cantilever end of the first support plate; the first support plate is used to hold the sprue wax mold for positioning; the latch is used to lock and fix the sprue wax mold to the first support plate.

[0012] Furthermore, the cantilever end of the first support plate is thickened, and the cantilever end of the first support plate is machined to form a concave first contoured fork. The first contoured fork is used to fork onto the outer wall of the sprue wax mold to position the sprue wax mold. The first contoured fork is also designed to be forked based on the surface to be forked on the sprue wax mold. The first end of the locking latch is fixedly connected to the first side of the first contoured fork, and the second end of the locking latch is movably engaged with the second side of the first contoured fork. The side of the positioning base plate is concave to form a recess, and a baffle for closing it is connected to the outside of the recess. The support column is vertically set on the support base plate and its middle section is locked in the recess and pressed and fixed in the recess by the baffle.

[0013] Furthermore, the outer support assembly includes a support base mounted on the support base plate, a lifting and adjusting mechanism connected to the top of the support base, a support shaft vertically connected to the lifting and adjusting mechanism, and a mounting bracket installed on the top of the support shaft; the lifting and adjusting mechanism is used to adjust the up and down movement of the support shaft; the mounting bracket is used to clamp and position the impeller wax mold and the riser and reinforcing rib wax mold respectively, and the mounting bracket is also used to release the clamping and positioning of the impeller wax mold and the riser and reinforcing rib wax mold when the support shaft descends, so as to remove the wax mold assembly later.

[0014] Furthermore, the support base includes a pad supported on the support base plate and a cover plate fixed to the top of the pad; the lifting adjustment mechanism includes a first base fixed to the top of the cover plate, a wedge, a mounting plate, and a screw; the side wall of the first base is machined with an inwardly extending wedge hole, the bottom of the wedge hole penetrating the bottom surface of the first base; the wedge is located in the wedge hole and is slidably supported on the cover plate, and the top surface of the wedge is machined to form a wedge surface that gradually slopes downward along the extension direction of the wedge hole; the mounting plate is fixed to the outer wall surface at the entrance of the wedge hole, and the screw is located outside the first base and its inner end is threaded through the mounting plate and connected to the wedge.

[0015] Furthermore, the top of the first base is also machined with a recessed extension to connect the mounting channel of the wedge hole; the support shaft includes a small end and a large end arranged and connected in sequence, the large end is slidably mounted in the mounting channel, and the bottom surface of the large end is machined to form an inclined surface that cooperates with the wedge surface, the small end extends upward out of the mounting channel and then into the mounting bracket so that the mounting bracket is supported on the large end.

[0016] Furthermore, the mounting bracket includes a second base passing through the small end, a vertical plate fixedly connected to the second base, a second support plate fixedly connected to the second base and forming a cantilever structure, and a third support plate vertically connected to the top of the vertical plate and forming a cantilever structure; the cantilever end of the second support plate is machined to form a concave second contour fork, which is used to fork onto the journal at the lower end of the impeller wax mold to fork and position the impeller wax mold, and the second contour fork is also set in a contoured manner with reference to the fork surface on the journal; the cantilever end of the third support plate is machined to form a concave third contour fork, which is used to fork onto the outer circle of the riser and reinforcing rib wax mold to fork and position the riser and reinforcing rib wax mold, and the third contour fork is also set in a contoured manner with reference to the fork surface on the riser and reinforcing rib wax mold.

[0017] According to another aspect of the present invention, a method for assembling an impeller wax mold assembly is also provided, for using a jig for assembling an impeller assembly as described above, comprising the following steps: positioning and installing the front section wax mold assembly of the runner using a central support group; positioning and installing the main filter screen, the sprue wax mold, the pouring cup wax mold, the bypass filter screen, and the rear section wax mold of the runner using the combined action of the central support group and the side support group; positioning and installing the impeller wax mold using an outer support group; positioning and installing the riser and reinforcing rib wax mold using an outer support group; inspecting the wax mold assembly; and removing the wax mold assembly after cooling.

[0018] The present invention has the following beneficial effects: By using the fixture of this invention to assemble the wax pattern modules, it is possible to effectively ensure that the three sets of wax patterns at the front and rear sections of the horizontal sprue are evenly distributed 120° circumferentially. This avoids inconsistent metal flow in the subsequent shell-forming gating system due to inconsistent assembly, ensuring that molten metal is uniformly and synchronously filled into the three sets of impeller shells from the sprue wax pattern during the subsequent pouring process. This facilitates synchronous solidification at all three locations, thereby improving the dimensional stability and geometric accuracy of the casting, reducing casting quality fluctuations, and resulting in good product consistency. Furthermore, it allows for more uniform stress distribution on the overall structure during subsequent thermal shrinkage of the molten wax, reducing localized stress concentration. The combined effect of the central support group, side support group, and three sets of outer support groups further enhances the casting's performance. The entire assembly operation can be completed by a single person, making the assembly simple and easy, while significantly reducing assembly time and improving efficiency by over 100%. It also effectively reduces the impact of technical barriers and human factors on quality, making it suitable for mass production. Furthermore, it solves the problem of inaccurate positioning of components during assembly, ensuring that the sprue wax mold is precisely positioned at the center of the main filter screen, and the front and rear sections of the runner wax mold are precisely positioned at the center of the bypass filter screen, guaranteeing a concentricity deviation of ≤0.1mm, thereby reducing dimensional deviations. During assembly, components can be clamped and supported to prevent deformation due to their own weight, ultimately improving the molding quality.

[0019] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0020] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a partial structural diagram of the wax model module; Figure 2 This is a top view of the wax model module. Figure 3 This is a schematic diagram of the spatial structure of the clamping and positioning wax mold module according to a preferred embodiment of the present invention; Figure 4 yes Figure 3 Front view structural diagram; Figure 5 yes Figure 4 A top-view structural diagram; Figure 6 yes Figure 4 Schematic diagram of the cross-sectional structure along the middle AA direction; Figure 7 yes Figure 4 Schematic diagram of the cross-sectional structure in the middle BB direction; Figure 8 yes Figure 4 Schematic diagram of the cross-sectional structure along the CC direction; Figure 9 This is a schematic diagram of the spatial structure of the wax mold assembly at the front of the horizontal runner; Figure 10 This is a top view of the positioning base plate. Figure 1 ; Figure 11 This is a schematic diagram of the spatial structure of the wax mold at the rear section of the horizontal runner; Figure 12 This is a top view of the positioning base plate. Figure 2 ; Figure 13 This is a schematic diagram of the spatial structure of the wax mold for the direct sprue; Figure 14 This is a top view of the structure of the first support plate; Figure 15 yes Figure 14 Schematic diagram of the DD-direction cross-section structure; Figure 16 This is a schematic diagram of the spatial structure of the impeller wax mold; Figure 17 This is a top view of the second support plate. Figure 18 This is a schematic diagram of the main structure of the riser and reinforcing rib wax model; Figure 19 This is a top view of the third support plate. Figure 20 This is a schematic diagram of the assembled state of the wax mold at the front of the horizontal runner; Figure 21 This is a schematic diagram of the main filter assembly status; Figure 22 This is a schematic diagram of the wax mold assembly status of the direct sprue. Figure 23 This is a schematic diagram of the wax mold assembly state of the pouring cup; Figure 24 This is a schematic diagram of the bypass filter assembly status; Figure 25 This is a schematic diagram of the wax model assembly status at the rear section of the horizontal runner; Figure 26 This is a schematic diagram of the impeller wax mold assembly state; Figure 27 This is a schematic diagram of the wax mold assembly state of the riser and reinforcing ribs.

[0021] Legend: 11. Sprue cup wax model; 12. Straight runner wax model; 13. Front section wax model assembly of the runner; 14. Main filter screen; 15. Bypass filter screen; 16. Rear section wax model of the runner; 17. Impeller wax model; 18. Riser and reinforcing rib wax model; 2. Support base plate; 3. Central support assembly; 31. Elevating cup; 32. Positioning base plate; 321. Second positioning hole; 322. First positioning groove; 323. Positioning cavity; 324. Second positioning groove; 33. Stop block; 4. Side support assembly; 41. Column; 42. First support plate; 420. First contour fork; 43. Lock; 44. Baffle; 5. Outer support assembly; 511. Pad block; 512. Cover plate; 521. First base; 522. Wedge; 523. Mounting plate; 524. Screw; 53. Support shaft; 541. Second base; 542. Vertical plate; 543. Second support plate; 5430. Second contour fork; 544. Third support plate; 5440. Third contour fork. Detailed Implementation

[0022] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] Those skilled in the art will understand that, unless specifically stated otherwise, the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, components, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, components, and / or combinations thereof. It should be understood that when we say a component is "connected" to another component, it can be directly connected to the other component or connected via an intermediate component. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items. The terms "first" and "second," etc., in this specification and claims are used to distinguish different objects, not to describe a particular order.

[0024] Reference Figure 1-5A preferred embodiment of the present invention provides a fixture for assembling an impeller module, comprising: a support base plate 2, a central support group 3 and a side support group 4 respectively fixedly supported on the support base plate 2, and three outer support groups 5 supported on the support base plate 2 and disposed around the central support group 3. The central support group 3 is used to install and support the front section wax mold assembly 13 of the horizontal runner, three bypass filters 15, and three sections of the rear section wax mold 16 of the horizontal runner, and to connect the first side of the three bypass filters 15 to the free end of the three sections of the front section wax mold of the horizontal runner ... Side support group 4 is used to vertically clamp the sprue wax model 12, so that the bottom end of the sprue wax model 12 is positioned and connected to the main filter screen 14 at the top of the front section wax model assembly 13 of the horizontal runner. The top end of the sprue wax model 12 is also used to position and connect the pouring cup wax model 11. Each set of outer support groups 5 is used to clamp and support a set of impeller wax models 17 and a set of riser and reinforcing rib wax models 18 at the corresponding angular positions, and to position and connect the bottom end of the impeller wax model 17 to the second end of the rear section wax model 16 of the lower horizontal runner, and to position and connect the riser and reinforcing rib wax models 18 to the top end of the impeller wax model 17. The outer support group 5 is adjustable up and down, so that the impeller wax model 17 and the riser and reinforcing rib wax models 18 can be released after lowering.

[0025] The impeller module assembly fixture of the present invention, through the setting of the central support group 3, respectively installs and supports the front section wax mold assembly 13 of the horizontal runner, three bypass filter screens 15, and three sections of the rear section wax mold 16 of the horizontal runner. The first sides of the three bypass filter screens 15 are respectively connected to and positioned at the free ends of the three sections of the front section wax mold of the horizontal runner of the front section wax mold assembly 13, and the first ends of the three sections of the rear section wax mold 16 are respectively connected to and positioned at the second sides of the three bypass filter screens 15. Furthermore, the top end of the central section of the front section wax mold assembly 13 is also used to connect and position the main filter screen 14; through the side support group 4... The system is configured to vertically clamp the sprue wax model 12, so that the bottom end of the sprue wax model 12 is positioned and connected to the main filter screen 14 at the top of the front section wax model assembly 13 of the horizontal runner, and the top end of the sprue wax model 12 is also positioned and connected to the pouring cup wax model 11; the outer support group 5 is configured to clamp and support a set of impeller wax models 17 and a set of riser and reinforcing rib wax models 18 at corresponding angular positions, so that the bottom end of the impeller wax model 17 is positioned and connected to the second end of the rear section wax model 16 of the lower horizontal runner, and the riser and reinforcing rib wax model 18 is positioned and connected to the top end of the impeller wax model 17, thereby realizing the assembly of the wax model module.

[0026] By using the fixture of this invention to assemble the wax pattern modules, it is possible to effectively ensure that the three sets of wax patterns at the front and rear sections of the horizontal sprue are evenly distributed 120° circumferentially. This avoids inconsistent metal flow in the subsequent shell-forming gating system due to inconsistent assembly, ensuring that during the subsequent pouring process, the molten metal is uniformly and synchronously filled into the three sets of impeller shells from the sprue wax pattern 12. This facilitates synchronous solidification at three locations, thereby improving the dimensional stability and geometric accuracy of the casting, reducing casting quality fluctuations, and resulting in good product consistency. Furthermore, it allows for more uniform stress distribution on the overall structure during subsequent thermal shrinkage of the molten wax, reducing localized stress concentration. Through the coordinated action of the central support group 3, the side support group 4, and the three outer support groups 5, it is possible to... The entire assembly operation can be completed by only one person, making the assembly simple and easy, while significantly shortening the assembly time and improving efficiency by over 100%. It also effectively reduces the technical threshold and the impact of human factors on quality, making it suitable for mass production. At the same time, it solves the problem of inaccurate positioning of various components during the assembly process, ensuring that the wax mold 12 of the sprue is accurately positioned at the center of the main filter screen 14, and the wax molds of the front section of the horizontal runner and the rear section of the horizontal runner 16 are accurately positioned at the center of the bypass filter screen 15, ensuring that the concentricity deviation is ≤0.1mm, thereby reducing dimensional deviations. In addition, the components can be clamped and supported during the assembly process to ensure that the components are not deformed by their own weight, ultimately improving the molding quality.

[0027] Optionally, such as Figure 3 and Figure 4 As shown, the central support assembly 3 includes a raised cup 31 fixedly supported at the center of the support base plate 2, and a positioning base plate 32 for installation and positioning. The top of the raised cup 31 has a recessed first positioning hole, and the bottom of the positioning base plate 32 protrudes outward to form a positioning boss. The positioning base plate 32 is inserted into the first positioning hole via its positioning boss and positioned and supported on the top of the raised cup 31. The positioning base plate 32 is used to install the positioning wax mold assembly 13 for the front section of the horizontal runner, the three bypass filters 15, and the wax molds 16 for the rear section of the three horizontal runners, respectively.

[0028] In this optional solution, such as Figure 3 and Figure 10 As shown, the top surface of the positioning base plate 32 is machined with a recessed second positioning hole 321 and three sets of positioning grooves evenly distributed along the outer periphery of the second positioning hole 321. Each set of positioning grooves includes a first positioning groove 322, a positioning cavity 323, and a second positioning groove 324 arranged radially and connected in sequence. The first positioning groove 322 is also radially connected to the second positioning hole 321. The second positioning hole 321 and the three first positioning grooves 322 cooperate to position and install the wax model assembly 13 of the front section of the horizontal runner. The positioning cavity 323 is used to install and position the side filter screen, and the second positioning groove 324 is used to install and position the wax model 16 of the rear section of the horizontal runner.

[0029] During operation, such as Figure 9 and Figure 10 As shown, firstly, the wax model assembly of the front section of the horizontal runner is placed into the second positioning hole 321 and the three first positioning grooves 322, and the horizontal diameter d2 of the three first positioning grooves 322 is set according to the outer diameter d1 of the wax model of the front section of the horizontal runner, and d2=d1(0,+0.2); then, the free end face and the top surface of the center section of the wax model of the front section of the horizontal runner are respectively connected to the three bypass filters 15 and the main filter 14 with an appropriate amount of molten adhesive wax droplets, and attention is paid to the smoothness and absence of wax nodules at the connection. Preferably, as follows... Figure 8 As shown, the positioning cavity 323 is a blind cavity, or the positioning cavity 323 penetrates the positioning base plate 32, and the bottom is supported by the bypass filter screen 15 by the stop block 33 fixedly connected to the positioning base plate 32. Finally, install the three-section horizontal runner rear section wax model 16. Before installation, visually determine that the second end of the horizontal runner rear section wax model 16 is facing upwards. Then, use an appropriate amount of molten adhesive wax droplets to connect the other side of the bypass filter screen 15 to the first end of the horizontal runner rear section wax model 16. Note that the connection is smooth and free of wax nodules, and during installation, if... Figure 11-12 As shown, the transverse diameter d4 of the three second positioning grooves 324 is set according to the outer diameter d3 of the wax mold 16 in the rear section of the transverse runner, and d4 = d3 (0, +0.2).

[0030] Optionally, such as Figure 3-4 As shown, the side support assembly 4 includes a vertically arranged column 41 fixedly supported on the positioning base plate 32, a first support plate 42 vertically fixed to the top of the column 41 to form a cantilever structure, and a latch 43 connected to the cantilever end of the first support plate 42. The first support plate 42 is used to hold the sprue wax model 12 for positioning. The latch 43 is used to lock and fix the sprue wax model 12 to the first support plate 42.

[0031] In this optional solution, such as Figure 14-15 As shown, the cantilever end of the first support plate 42 is thickened, and the cantilever end of the first support plate 42 is machined to form a concave first contoured fork 420. The first contoured fork 420 is used to fork onto the outer wall of the sprue wax model 12 to position the sprue wax model 12. The first contoured fork 420 is also contoured to the fork-holding surface on the sprue wax model 12. The first end of the locking latch is fixedly connected to the first side of the first contoured fork 420, and the second end of the locking buckle 43 is movably engaged with the second side of the first contoured fork 420. Figure 7 As shown, the side of the positioning base plate 32 is recessed to form a notch, and a baffle 44 for closing it is connected to the outside of the notch. The support column 41 is vertically set on the support base plate 2 and its middle section is locked in the notch, and is pressed and fixed in the notch by the baffle 44.

[0032] During operation, apply a suitable amount of molten adhesive wax droplets to the upper surface of the main filter screen 14 at the top of the wax model assembly 13 in the front section of the horizontal runner, connecting it to the sprue wax model 12. Ensure the connection is smooth and free of wax nodules. During installation, center the sprue wax model 12 using the semi-circular first contoured fork 420 on the first support plate 42, then lock it with the latch 43, ensuring the center of the main filter screen 14 is perpendicular and concentric with the sprue wax model 12. Figure 13-15 As shown, the diameters d7 and d8 of the upper and lower support parts of the first support plate 42 are set according to the corresponding diameters d5 and d6 of the sprue wax model 12, i.e., d7=d5±0.1, d8=d6±0.1. Then, the sprue cup wax model 11 is positioned and connected to the top of the sprue wax model 12.

[0033] Optionally, such as Figure 3 and Figure 6 As shown, the outer support assembly 5 includes a support base mounted on the support base plate 2, a lifting and adjusting mechanism connected to the top of the support base, a support shaft 53 vertically connected to the lifting and adjusting mechanism, and a mounting bracket mounted on the top of the support shaft 53. The lifting and adjusting mechanism is used to adjust the vertical movement of the support shaft 53. The mounting bracket is used to clamp and position the impeller wax model 17 and the riser and reinforcing rib wax model 18 respectively, and the mounting bracket is also used to release the clamping and positioning of the impeller wax model 17 and the riser and reinforcing rib wax model 18 when the support shaft 53 descends, so as to remove the wax model assembly later.

[0034] In this optional solution, such as Figure 6 As shown, the support base includes a pad 511 supported on the support base plate 2 and a cover plate 512 fixed to the top of the pad 511. The lifting adjustment mechanism includes a first base 521 fixed to the top of the cover plate 512, a wedge 522, a mounting plate 523, and a screw 524. The side wall of the first base 521 is machined with an inwardly extending wedge 522 hole, the bottom of which penetrates the bottom surface of the first base 521. The wedge 522 is located in the wedge 522 hole and is slidably supported on the cover plate 512. The top surface of the wedge 522 is machined to form a wedge 522 surface that gradually slopes downward along the extension direction of the wedge 522 hole. The mounting plate 523 is fixed to the outer wall surface at the entrance of the wedge 522 hole. The screw 524 is located outside the first base 521 and its inner end is threaded through the mounting plate 523 and connected to the wedge 522.

[0035] In this optional solution, such as Figure 6 As shown, the top of the first base 521 is also machined with a recessed extension to connect the mounting channel of the wedge 522 hole. The support shaft 53 includes a small end and a large end arranged and connected vertically. The large end is slidably mounted in the mounting channel, and the bottom surface of the large end is machined to form an inclined surface that cooperates with the wedge 522 surface. The small end extends upward out of the mounting channel and into the mounting bracket so that the mounting bracket is supported on the large end.

[0036] Optionally, such as Figure 3 and Figure 6 As shown, the mounting bracket includes a second base 541 passing through the small end, a vertical plate 542 vertically fixedly connected to the second base 541, a second support plate 543 fixedly connected to the second base 541 and forming a cantilever structure, and a third support plate 544 vertically connected to the top of the vertical plate 542 and forming a cantilever structure. The cantilever end of the second support plate 543 is machined to form a concave second contour fork 5430. The second contour fork 5430 is used to fork onto the journal at the lower end of the impeller wax mold 17 to fork and position the impeller wax mold 17, and the second contour fork 5430 is also contoured with reference to the surface on the journal to be forked. The cantilever end of the third support plate 544 is machined to form a concave third contour fork 5440. The third contour fork 5440 is used to fork onto the outer circle of the riser and reinforcing rib wax mold 18 to fork and position the riser and reinforcing rib wax mold 18. The third contour fork 5440 is also set in a contoured manner with reference to the fork surface on the riser and reinforcing rib wax mold 18.

[0037] When installing the impeller wax model 17, use an appropriate amount of molten adhesive wax droplets to connect the second end face of the wax model 16 in the rear section of the horizontal runner to the bottom end of the impeller wax model journal. Ensure the connection is smooth and free of wax nodules. During installation, if... Figure 16-17 As shown, the impeller wax mold 17 is positioned by the second contour fork 5430 on the second support plate 543, and the support diameter d12 of the second contour fork 5430 is set according to the journal diameter d11 of the impeller wax mold 17, and d12=d11±0.1.

[0038] When installing the riser and reinforcing rib wax model 18, use an appropriate amount of molten adhesive wax droplets to connect the lower end face of the riser and reinforcing rib wax model 18 to the large end face of the impeller wax model 17; simultaneously, connect the two reinforcing ribs on the riser and reinforcing rib wax model 18 to the pouring cup wax model 11 and the sprue wax model 12 using an appropriate amount of molten adhesive wax droplets, ensuring the connection is smooth and free of wax nodules. During installation, position the riser and reinforcing rib wax model 18 using the third contour fork 5440 on the third support plate 544. Figure 18-19 As shown, the support diameters d15 and d16 of the third contour fork 5440 are set according to the lower end diameters d13 and d14 of the riser and the reinforcing rib wax model 18, and d15 = d13 ± 0.1, d16 = d14 ± 0.1.

[0039] When removing the wax model assembly, first loosen the screw 524 to move the wedge 522 outward. Correspondingly, the support shaft 53 that is attached to the wedge 522 moves downward, and the second support plate 543 and the third support plate 544 fixed thereto separate from the impeller wax model 17, the riser and the reinforcing rib wax model 18. Then, move the outer support assembly 5 outward until it is no longer obstructed. Then, open the lock 43. At this time, the entire wax model assembly can be taken out vertically upward.

[0040] A preferred embodiment of the present invention also provides a method for assembling an impeller module, used with a jig for assembling an impeller module as described above, comprising the following steps: S10: The wax mold assembly 13 of the front section of the horizontal runner is installed using the central support group 3 for positioning; S20: The main filter screen 14, the straight runner wax model 12, the pouring cup wax model 11, the bypass filter screen 15, and the horizontal runner rear section wax model 16 are positioned and installed by the cooperation of the central support group 3 and the side support group 4. S30: The impeller wax mold 17 is positioned and installed using the outer support group 5; S40: The outer support group 5 is used to position and install the riser and reinforcing rib wax mold 18; S50: Inspect wax model assembly; S60: Remove the wax model assembly after cooling.

[0041] The impeller module assembly method of the present invention features clear steps, simple operation, and saves time and effort when assembling each component. Furthermore, by employing the impeller module assembly fixture described above, the assembly operation effectively ensures that the three sets of wax molds at the front and rear sections of the horizontal runner 16 are evenly distributed 120° circumferentially, avoiding inconsistent metal flow due to inconsistent assembly. This ensures that during subsequent pouring, molten metal is uniformly and synchronously filled into the three impeller shells from the sprue wax mold 12, facilitating simultaneous solidification at all three locations. This improves the dimensional stability and geometric accuracy of the casting, reduces casting quality fluctuations, and results in good product consistency. It also allows for more uniform stress distribution on the overall structure during subsequent thermal shrinkage of the molten wax, reducing localized stress concentration. Simultaneously, the central support group 3 and the side... The combined effect of the side support group 4 and the three outer support groups 5 allows the entire assembly operation to be completed by only one person. The assembly operation is simple and easy, and the assembly time is greatly shortened, improving the efficiency by more than 100%. It also effectively reduces the technical threshold and the impact of human factors on quality, making it suitable for mass production. At the same time, it solves the problem of inaccurate positioning of various components during the assembly process, so that the wax mold 12 of the straight runner is accurately positioned at the center of the main filter screen 14, and the wax molds of the front section of the horizontal runner and the rear section of the horizontal runner 16 are accurately positioned at the center of the bypass filter screen 15, ensuring that the concentricity deviation is ≤0.1mm, thereby reducing dimensional deviation. At the same time, the components can be clamped and supported during the assembly process to ensure that the components are not deformed by their own weight, ultimately improving the impeller forming quality.

[0042] Specifically, step S10 involves placing the wax model assembly 13 of the front section of the horizontal runner into the positioning base plate 32 of this fixture, as follows: Figure 20 As shown. Among them, the diameter d2 of the three first positioning grooves 322 is set according to the outer diameter d1 of the wax model in the front section of the horizontal runner, and d2=d1(0,+0.2).

[0043] Specifically, step S20 involves the following steps: First, the main filter screen 14 is connected to the top surface of the wax mold assembly 13 at the front of the horizontal runner using molten adhesive wax droplets, as shown below. Figure 21 As shown. Then, use an appropriate amount of molten adhesive wax droplets to connect the upper surface of the main filter screen 14 to the sprue wax mold 12, as shown. Figure 22 As shown, note that the installation area should be smooth and free of wax nodules. During installation, use the semi-circular contoured surface of the first contoured fork 420 on the first support plate 42 of this fixture to center the sprue wax model 12, and then lock it with the semi-circular contoured locking buckle 43 to ensure that the center of the main filter screen 14 is perpendicular to and concentric with the sprue wax model 12; Figure 13-15 As shown, the diameters d7 and d8 of the upper and lower support parts of the first support plate 42 are set according to the corresponding diameters d5 and d6 of the wax model 12 in the sprue, respectively, with d7 = d5 ± 0.1 and d8 = d6 ± 0.1. Next, according to the attached... Figure 23 Install the wax model 11 for the pouring cup, ensuring the installation area is smooth and free of wax nodules. Then, use an appropriate amount of molten adhesive wax droplets to connect the three sides of the wax model at the front of the runner to the bypass filter screen 15, ensuring the installation area is smooth and free of wax nodules. Figure 24 As shown. Finally, before installation, visually determine that the right end of the wax model 16 at the rear of the runner is facing upwards. Use an appropriate amount of molten adhesive wax to connect the other end of the bypass filter screen 15 to the wax model 16 at the rear of the runner, ensuring the installation area is smooth and free of wax nodules. Figure 25 As shown; during installation, it is achieved through the second positioning groove 324 of this fixture. The diameter d4 of the three second positioning grooves 324 is set according to the corresponding surface d3 of the wax model 16 in the rear section of the horizontal runner, and d4=d3(0,+0.2).

[0044] Specifically, step S30 involves: simultaneously with or after step S10, positioning the impeller wax model 17 within the semi-circular contour surface of the second support plate 543 of the fixture; after step S20, connecting the impeller wax model 17 to the upper surface of the rear section wax model 16 of the runner using molten adhesive wax drops. During operation, an appropriate amount of molten adhesive wax drops is used to connect the upper surface of the rear section wax model 16 of the runner to the impeller wax model 17, ensuring the installation area is smooth and free of wax nodules. Figure 26 As shown. During installation, the impeller wax model 17 is positioned using the semi-circular contour surface on the second support plate 543 of this fixture. The diameter d12 of the support opening of the second support plate 543 in the figure is set according to the diameter d11 of the small end of the impeller wax model 17, where d12 = d11 ± 0.1. Figure 16-17 As shown.

[0045] Specifically, step S40 involves: using an appropriate amount of molten adhesive wax droplets to connect the lower end face of the riser and reinforcing rib wax model 18 to the large end face of the impeller wax model 17; simultaneously, using an appropriate amount of molten adhesive wax droplets to connect the two reinforcing ribs on the riser and reinforcing rib wax model 18 to the pouring cup wax model 11 and the sprue wax model 12, ensuring the installation area is smooth and free of wax nodules, as shown in Figure 27. During installation, the riser and reinforcing rib wax model 18 is positioned using the semi-circular contour surface on the third support plate 544 of this fixture. Figure 18-19 In the middle, the support opening diameters d15 and d16 of the third support plate 544 are set according to the lower end diameters d13 and d14 of the riser and the reinforcing rib wax mold 18, with d15=d13±0.1 and d16=d14±0.1.

[0046] Specifically, step S50 involves checking that all installation points of the module have a smooth transition and are free from defects such as wax nodules, grooves, protrusions, sharp edges, cracks, air holes, pinholes, burrs, flash, black spots, and other impurities.

[0047] Specifically, step S60 is operated as follows: First, loosen the screw 524 to move the wedge 522 outward. Correspondingly, the support shaft 53 that is attached to the wedge 522 moves downward, and the second support plate 543 and the third support plate 544 fixed thereto are separated from the impeller wax mold 17, the riser and the reinforcing rib wax mold 18. Then, move the outer support group 5 outward until it is not obstructed. Then, open the lock 43. At this time, the entire impeller wax mold group can be taken out vertically upward.

[0048] Preferably, in step S30, after the impeller wax mold 17 is positioned on the semi-circular contour surface of the second support plate 543, it is only positioned and placed without connection before step S20 is completed. After the wax mold 16 of the rear section of the horizontal runner is installed, the impeller wax mold 17 is then connected to the upper end face of the wax mold 16 of the rear section of the horizontal runner.

[0049] Preferably, steps S10, S20 and S30 can be executed in parallel, and different operators can operate them simultaneously at different positions of the same fixture or on different fixtures. The installation of the wax model of the front section of the horizontal runner in step S10, the assembly of the wax model 12 of the straight runner and the assembly of the wax model 16 of the rear section of the horizontal runner in step S20, and the positioning and placement of the impeller wax model 17 in step S30 are carried out simultaneously without waiting for each other.

[0050] Preferably, in step S20, the main filter screen 14 and the bypass filter screen 15 are connected alternately at the same station or synchronously at different stations. The connection order of the main filter screen 14 and the bypass filter screen 15 is not limited, and the connection order of the three bypass filter screens 15 is not limited.

[0051] Preferably, in step S20, the sprue wax mold 12 and the pouring cup wax mold 11 are pre-spot welded into a component on the outside of the fixture before being connected to the pouring cup wax mold 11, and then the whole assembly is installed into the first support plate 42 for centering and locking, so as to shorten the time occupied by the main fixture.

[0052] Preferably, in step S40, the connection sequence of the riser and reinforcing rib wax mold 18 is to first connect the reinforcing rib of the sprue wax mold 12, and then connect the reinforcing rib of the pouring cup wax mold 11, so that the connection shrinkage stress is released towards the pouring cup wax mold 11, and the axis of the sprue wax mold 12 is not offset.

[0053] Preferably, in step S20, the centering and locking of the sprue wax mold 12 adopts a step-by-step operation of pre-tightening followed by fine-tuning. That is, the lock 43 is first closed until it contacts the sprue wax mold 12 without applying a locking force. After adjusting the sprue wax mold 12 to be vertical, the lock 43 is then fully locked.

[0054] Preferably, in step S60, before removing the system module, compressed air is used to blow each positioning surface of the fixture for 0.5~1s to remove scattered wax debris and avoid scratching the surface of the system wax model when removing it.

[0055] Preferably, in steps S10 to S40, the amount of each molten bonding wax droplet applied is 2-3 mm in diameter, and each connection point must have a smooth transition without wax nodules, depressions, or pore defects.

[0056] Preferably, in step S20, the right end of the three horizontal runner rear section wax molds 16 should be visually determined to be upward before installation to ensure the correct alignment of the horizontal runner rear section wax mold 16 with the impeller wax mold 17 end face.

[0057] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A fixture for assembling impeller modules, characterized in that, include: Support base plate (2), central support group (3) and side support group (4) respectively fixed and supported on the support base plate (2), and three outer support groups (5) supported on the support base plate (2) and located on the outer periphery of the central support group (3). The central support assembly (3) is used to install and support the front section wax model assembly (13), three bypass filters (15) and three sections of the rear section wax model (16) of the horizontal runner respectively, and to connect and position the first side of the three bypass filters (15) to the free end of the three sections of the front section wax model of the horizontal runner of the front section wax model assembly (13), and to connect and position the first end of the three sections of the rear section wax model (16) of the horizontal runner to the second side of the three bypass filters (15), and the top of the central section of the front section wax model assembly (13) is used to connect and position the main filter (14). The side support group (4) is used to vertically clamp the sprue wax mold (12) so that the bottom end of the sprue wax mold (12) is positioned and connected to the main filter screen (14) at the top of the front section wax mold assembly (13) of the horizontal runner. The top end of the sprue wax mold (12) is also used to position and connect the pouring cup wax mold (11). Each set of outer support groups (5) is used to clamp and support a set of impeller wax molds (17) and a set of riser and reinforcing rib wax molds (18) at the corresponding angular position, and to position the bottom end of the impeller wax mold (17) to the second end of the lower horizontal runner rear section wax mold (16), and to position the riser and reinforcing rib wax mold (18) to the top end of the impeller wax mold (17). The outer support group (5) is adjustable up and down, so that the impeller wax mold (17) and riser and reinforcing rib wax mold (18) clamped and supported can be released after lowering.

2. The jig for assembling impeller modules according to claim 1, characterized in that, The central support assembly (3) includes a raised cup (31) fixedly supported in the center of the support base plate (2) and a positioning base plate (32) for installation and positioning. The top of the cup (31) is machined with a recessed first positioning hole, and the bottom of the positioning base plate (32) is convex to form a positioning boss. The positioning base plate (32) is positioned and supported on the top of the cup (31) after being inserted into the first positioning hole through its positioning boss. The positioning base plate (32) is used to install the positioning horizontal runner front section wax mold assembly (13), three bypass filter screens (15) and three horizontal runner rear section wax molds (16) respectively.

3. The jig for assembling impeller modules according to claim 2, characterized in that, The top surface of the positioning base plate (32) is machined with a recessed second positioning hole (321) and three sets of positioning grooves evenly distributed along the outer periphery of the second positioning hole (321). Each set of positioning grooves includes a first positioning groove (322), a positioning cavity (323) and a second positioning groove (324) arranged and connected in a radial direction, and the first positioning groove (322) is also radially connected to the second positioning hole (321). The second positioning hole (321) and the three first positioning grooves (322) work together to position and install the wax mold assembly (13) of the front section of the horizontal runner. The positioning cavity (323) is used to install the side filter screen and the second positioning groove (324) is used to install and position the wax mold (16) of the rear section of the horizontal runner.

4. The jig for assembling impeller modules according to claim 2, characterized in that, The side support group (4) includes a column (41) that is vertically set and fixedly supported on the positioning base plate (32), a first support plate (42) that is vertically fixed to the top of the column (41) to form a cantilever structure, and a latch (43) connected to the cantilever end of the first support plate (42). The first support plate (42) is used to hold the wax mold (12) of the sprue for positioning; The locking buckle (43) is used to lock and fix the wax mold (12) of the sprue to the first support plate (42).

5. The jig for assembling impeller modules according to claim 4, characterized in that, The cantilever end of the first support plate (42) is thickened, and the cantilever end of the first support plate (42) is processed to form a concave first contour fork (420). The first contour fork (420) is used to fork onto the outer wall of the sprue wax mold (12) to position the sprue wax mold (12). The first contour fork (420) is also contoured to the fork surface to be forked on the sprue wax mold (12). The first end of the locking port is fixedly connected to the first side of the first contour fork (420), and the second end of the locking buckle (43) is movably fastened to the second side of the first contour fork (420). The side of the positioning base plate (32) is recessed to form a notch. A baffle (44) for closing the notch is also connected to the outside of the notch. The support column (41) is vertically set on the support base plate (2) and the middle section is locked in the notch. It is pressed and fixed in the notch by the baffle (44).

6. The jig for assembling impeller modules according to claim 1, characterized in that, The outer support group (5) includes a support base supported on the support base plate (2), a lifting adjustment mechanism connected to the top of the support base, a support shaft (53) vertically connected to the lifting adjustment mechanism, and a mounting bracket installed on the top of the support shaft (53). The lifting adjustment mechanism is used to adjust the vertical movement of the support shaft (53); The mounting bracket is used to clamp and position the impeller wax mold (17) and the riser and reinforcing rib wax mold (18) respectively. The mounting bracket is also used to release the clamping and positioning of the impeller wax mold (17) and the riser and reinforcing rib wax mold (18) when the support shaft (53) descends, so that the wax mold module can be removed later.

7. The jig for assembling impeller modules according to claim 6, characterized in that, The support base includes a pad (511) supported on the support base plate (2) and a cover plate (512) fixed to the top of the pad (511). The lifting and adjusting mechanism includes a first base (521) fixed to the top of the cover plate (512), a wedge (522), a mounting plate (523), and a screw (524); The side wall of the first base (521) is machined with an inwardly extending inclined wedge (522) hole, the bottom of which penetrates the bottom surface of the first base (521); The wedge (522) is located in the wedge (522) hole and is slidably supported on the cover plate (512). The top surface of the wedge (522) is machined to form a wedge (522) surface that gradually slopes downward along the extension direction of the wedge (522) hole. The mounting plate (523) is fixed on the outer wall surface at the entrance of the wedge (522) hole. The screw (524) is located outside the first base (521) and its inner end is threaded through the mounting plate (523) and then connected to the wedge (522).

8. The jig for assembling impeller modules according to claim 7, characterized in that, The top of the first base (521) is also machined with a concave extension to connect the mounting channel of the wedge (522) hole; The support shaft (53) includes a small end and a large end that are arranged and connected in sequence. The large end is slidably installed in the installation channel, and the bottom surface of the large end is machined to form an inclined surface that cooperates with the wedge (522) surface. The small end extends upward out of the installation channel and then into the installation bracket so that the installation bracket is supported on the large end.

9. The jig for assembling impeller modules according to claim 8, characterized in that, The mounting bracket includes a second base (541) passing through the small end, a vertical plate (542) vertically fixed to the second base (541), a second support plate (543) fixedly connected to the second base (541) and forming a cantilever structure, and a third support plate (544) vertically connected to the top of the vertical plate (542) and forming a cantilever structure. The cantilever end of the second support plate (543) is machined to form a concave second contour fork (5430). The second contour fork (5430) is used to fork onto the journal at the lower end of the impeller wax mold (17) to fork and position the impeller wax mold (17). The second contour fork (5430) is also set in a contoured manner with reference to the fork surface on the journal. The cantilever end of the third support plate (544) is machined to form a concave third contour fork (5440). The third contour fork (5440) is used to fork onto the outer circle of the riser and reinforcing rib wax mold (18) to fork and position the riser and reinforcing rib wax mold (18). The third contour fork (5440) is also set in a contour with reference to the fork surface on the riser and reinforcing rib wax mold (18).

10. A method for assembling an impeller module, characterized in that, A fixture for assembling an impeller module as described in any one of claims 1-9 includes the following steps: The wax mold assembly (13) of the front section of the horizontal runner is positioned and installed using the central support group (3); The main filter screen (14), the straight runner wax model (12), the pouring cup wax model (1), the bypass filter screen (15), and the horizontal runner rear section wax model (16) are positioned and installed by the cooperation of the central support group (3) and the side support group (4). The impeller wax mold (17) is positioned and installed using an outer support assembly (5); The riser and reinforcing rib wax mold (18) are positioned and installed using the outer support group (5); Inspect the wax model assembly; Remove the wax model assembly after it has cooled.

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