Wax mould welding device and method for radial flow supercharger impeller

Abstract

The invention discloses a wax mould welding device and method for a radial flow supercharger impeller, which are suitable for welding wax moulds of impellers of the same model, different models and various specifications, reduce the mould input cost and improve the consistency of products. Comprising a blade installing and welding device and a lower ring installing and welding device, and the blade installing and welding device achieves welding of blade wax molds (32) of an upper ring wax mold (31); and the lower ring assembling and welding device is used for welding wax pieces of an upper ring wax mold (16) with a blade and a lower ring wax mold (33).

Description

Technical Field

[0001] The invention relates to the technical field of investment casting wax piece welding, and in particular to a wax pattern welding device and method for a radial supercharger impeller. Background Art

[0002] With the development of superchargers, more and more new product types and specifications are being developed, with small batches and strict requirements on the control of air flow. The cost of investing in molds for each type and specification is high. At the same time, the technical levels of workers are often uneven during the production process, and the consistency of products is difficult to ensure. During the manufacturing process, the thickness of some impellers varies greatly, and the size shrinkage is inconsistent.

[0003] The use of radial impeller wax mold welding device is one of the feasible methods to solve these problems. It is simple and easy to operate, with low investment cost, reduces the difficulty of workers' operation, and is suitable for small batch and multi-variety production mode.

[0004] like Figure 1 The wax part shown is the impeller of a radial flow supercharger. Due to the small batch size and the large number of models, each model has dozens of specifications, the blades are of special shapes, the overall mold structure is complex, the number of molds is large, and the mold cost is high. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a wax mold welding device and method for a radial supercharger impeller, which is suitable for welding wax molds of impellers of different models and specifications of the same model, reduces the requirements for workers' operating skills, reduces mold investment costs, and improves product consistency.

[0006] The object of the present invention is achieved in that:

[0007] A wax pattern welding device for a radial supercharger impeller, comprising a blade assembly welding device and a lower ring assembly welding device;

[0008] The blade assembly welding device comprises a first base (2), a tray (15), and a radial position positioning block (9). The upper surface of the first base (2) is coaxially provided with an axial positioning plane (23), an annular groove, and an annular mounting surface from the inside to the outside. The annular groove has an inner axial cylindrical surface (25) and an outer axial cylindrical surface (22). The tray (15) is annular, and the upper end of its outer circumferential surface is provided with a positioning cone surface (151). The positioning cone surface (151) is used to cooperate with the lower end of the inner circumferential surface of the upper ring wax mold (31) for positioning. The lower end of its outer circumferential surface is provided with a positioning step surface (153). The positioning step surface (153) is aligned with the first base. The outer axial cylindrical surface (22) and the annular mounting surface of the tray (2) are matched for positioning, the tray inner circular surface (152) of the tray (15) is slidably matched with the inner axial cylindrical surface (25) of the first base (2), and the first base (2) is matched with an axial adjustment screw (13) along the vertical thread, and the axial adjustment screw (13) is used to push the tray (15) to slide along the inner axial cylindrical surface (25) and the outer axial cylindrical surface (22) of the first base (2), so that the upper ring wax mold (31) contacts the positioning conical surface (151) of the tray (15), thereby realizing the axial and radial positioning of the upper ring wax mold (31);

[0009] The first base (2) is provided with a position adjustment mechanism, which includes a slider (4) and a center guide screw (14). The center guide screw (14) is fixed to the axial center of the axial positioning plane (23) along a vertical thread. One end of the slider (4) is provided with a waist-shaped slide groove (41). The end of the slider (4) is threaded with a radial adjustment screw (1). The other end of the slider (4) is provided with a positioning groove (42). The center guide screw (14) passes through the waist-shaped slide groove (41). A guide block is provided in the middle of the screw rod (14), and the guide block is slidably matched with the waist-shaped slide groove (41) of the slider (4) to form a guide for the slider (4) and axially position the central guide screw rod (14). The upper end thread of the central guide screw rod (14) is matched with a locking nut (12), and the locking nut (12) is used to fix the slider (4). The end of the radial adjustment screw rod (1) is pressed against the central guide screw rod (14) to move the slider (4). An air flow control movable block (5) is installed in the positioning groove (42);

[0010] The radial position positioning block (9) is arc-shaped, the lower end surface of the radial position positioning block (9) is an axial positioning surface (92), a radial positioning plate is provided on the inner arc surface of the radial position positioning block (9), the inner arc surface of the radial positioning plate is a radial positioning surface (91), two positioning bosses (93) are provided at the bottom of the radial positioning plate, the two positioning bosses (93) are used to be installed in two blade positioning holes (311) of the upper ring wax mold (31) for positioning, and a notch is provided in the middle of the radial positioning plate, the notch cooperates with the end of the air flow control movable block (5) to jointly control the welding position and angle of the blade wax mold (32);

[0011] The lower ring assembly welding device comprises a second base (6), the second base (6) is provided with a raised axial positioning surface (63), the raised axial positioning surface (63) is used to position the lower ring wax mold (33), the upper surface of the second base (6) is provided with three radially arranged slide grooves (61) and three circumferential positioning grooves (64) at staggered intervals, the three radially arranged slide grooves (61) and the three circumferential positioning grooves (64) are evenly distributed around the axial positioning surface (63) of the lower ring wax mold (33), the three circumferential positioning grooves (64) are used to cooperate with the boss of the lower ring wax mold (33) for positioning, each slide groove (61) is slidably matched with a position positioning block (8), the position positioning block (8) is L-shaped, and a waist-shaped groove (81) is provided on the flat section of the position positioning block (8), and the waist-shaped groove (81) passes through a locking screw (7), which is used to lock the radial position of the positioning block (8). The vertical wall surface of the positioning block (8) is provided with an arc boss (82), an upper concentricity positioning surface (83), a lower concentricity positioning surface (85), and an axial positioning surface (84). The arc boss (82) is used to engage with the circumferential positioning groove (312) of the upper ring wax mold (31) to form circumferential positioning. The axial positioning surface (84) of the positioning block (8) is used to align with the wax mold plane of the upper ring wax mold (31) for axial height positioning. The upper concentricity positioning surface (83) is used to fit the outer peripheral surface of the upper ring wax mold (16) with blades for radial positioning. The lower concentricity positioning surface (85) is used to fit the outer peripheral surface of the lower ring wax mold (33) for radial positioning.

[0012] Preferably, the first base (2) is in the shape of a stepped shaft, and the axial adjustment screw (13) is axially threadedly engaged with the large diameter section of the first base (2).

[0013] Preferably, a fixing screw (10) is threadedly engaged on the groove wall of the positioning groove (42), and the end of the fixing screw (10) abuts against the air flow control movable block (5).

[0014] Preferably, a notch is provided in the middle of the radial positioning plate, and the air flow control block (5) has the same end profile as the blade wax mold (32). The notch of the radial positioning plate, the end profile of the air flow control block (5), and the end profile of the blade wax mold (32) jointly control the welding position and angle of the blade wax mold (32).

[0015] Preferably, a boss is provided between the upper concentricity positioning surface (83) and the lower concentricity positioning surface (85) of the position positioning block (8), and the upper end surface of the boss is the axial positioning surface (84) of the position positioning block (8).

[0016] A wax mold welding method using a wax mold welding device for a radial supercharger impeller, wherein the impeller wax mold comprises an upper ring wax mold (31), a lower ring wax mold (33), and a blade wax mold (32), wherein the upper ring wax mold is provided with a blade positioning hole (311) and a circumferential positioning groove (312).

[0017] The upper ring wax mold (31) is placed upside down on the tray (15), and the axial adjustment screw (13) is rotated to push the tray (15) to slide upward along the inner axial cylindrical surface (25) and the outer axial cylindrical surface (22), so that the upper ring wax mold (31) contacts the positioning conical surface (151) of the tray (15), thereby achieving axial and radial positioning of the upper ring wax mold (31);

[0018] Install the radial position positioning block (9), install the positioning boss (93) of the radial position positioning block (9) in the two adjacent blade positioning holes (311) of the upper ring wax mold (31), rotate the radial adjustment screw (1) to move the slider (4), the end of the air flow control movable block (5) contacts the radial positioning surface (91) of the radial position positioning block (9), fix the slider (4) with the locking nut (12), remove the radial position positioning block (9), and place the blade wax mold (32) on the upper ring wax mold (3 1), rotate the upper wax mold (31) counterclockwise to make the profile of the blade wax mold (32) contact the same end profile of the air flow control block (5) and the blade wax mold (32), press the blade wax mold (32) downward to make the end surface of the blade wax mold contact the plane where the blade positioning hole (311) is located to achieve welding of the upper wax mold (31) and the blade wax mold (32), rotate the upper wax mold (31) in the clockwise direction to complete the welding of each blade wax mold (32) in turn;

[0019] The lower wax mold (33) is buckled onto the axial positioning surface (63) of the second base (6) to form radial positioning. The three bosses of the lower wax mold (33) are placed in the three circumferential positioning grooves (64) of the second base (6) to form circumferential positioning. The upper wax mold (16) with blades is placed above the lower wax mold (33). The arc bosses (82) on the position positioning block (8) are aligned and snapped into the circumferential positioning grooves (312) of the upper wax mold (31), so that the upper wax mold (16) is positioned. 6), the axial positioning surface (84) of the positioning block (8) is aligned with the wax mold plane of the upper ring wax mold (31) for axial height positioning, the positioning block (8) is pushed so that the upper concentricity positioning surface (83) fits the upper ring wax mold (16), and the lower concentricity positioning surface (85) fits the lower ring wax mold (33) for radial positioning, and the locking screw (7) is rotated to lock the positioning block (8), so as to realize the wax welding of the upper ring wax mold (16) with blades and the lower ring wax mold (33).

[0020] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0021] The radial impeller wax mold welding device is used to weld the radial impeller wax mold, which is easy to operate and suitable for welding impeller wax molds of different models and specifications of the same machine, reducing the requirements for workers' operating skills, reducing mold investment costs, and improving product consistency. In addition, the cost of making the wax mold welding device is low, and it is applicable to all radial impeller wax mold assembly welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is an axonometric view of the radial impeller wax model to be assembled and welded in this embodiment;

[0023] Figure 2 This is the axonometric view of the upper ring wax model;

[0024] Figure 3 It is a structural schematic diagram of a wax mold assembly welding device;

[0025] Figure 4 yes Figure 2 Exploded diagram of

[0026] Figure 5 It is an axonometric view of the base of the blade assembly welding device;

[0027] Figure 6 It is an axonometric view of the pallet;

[0028] Figure 7 It is the axonometric view of the slider;

[0029] Figure 8 It is an axonometric view of the radial position locating block;

[0030] Fig. 9 It is an axonometric view of the base of the lower ring assembly welding device;

[0031] Fig.10 It is an axonometric view of the positioning block.

[0032] Reference numerals

[0033] In the attached drawings, 1- radial adjustment screw; 2- base; 21- center screw hole; 22- axial cylindrical surface; 23- plane; 24- screw hole; 25- axial cylindrical surface; 3- impeller wax mold; 31- upper ring wax mold; 311- blade positioning hole; 312- positioning groove; 32- blade wax mold; 33- lower ring wax mold; 4- slider; 41- waist-shaped slide groove; 42- positioning groove; 43, 44- screw holes; 5- air flow control block; 6- lower ring welding device base; 61- slide groove; 62- tightening screw screw hole; 63- axial positioning surface ; 64-circumferential positioning surface; 65-circumferential positioning hole; 7-locking screw; 8-position positioning block; 81-waist groove; 82-arc boss; 83, 85-concentricity positioning point; 84-axial positioning point; 9-radial position positioning block; 91-radial positioning surface; 92-axial positioning surface; 93-positioning boss; 10-fixing screw; 11-washer; 12-locking nut; 13-axial adjustment screw; 14-center guide screw; 15-tray; 151-positioning cone; 152, 153-axial cylindrical surface. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] like Figure 2 to Figure 9 As shown, a wax pattern welding device for a radial impeller includes a blade assembly welding device and a lower ring assembly welding device, wherein the blade assembly welding device includes a base 2, the base 2 includes a main body, a central screw hole 21, axial cylindrical surfaces 22 and 25, a screw hole 24, and an axial positioning plane 23;

[0036] The base 2 is equipped with a tray 15 and an axial adjustment screw 13. The tray is provided with a positioning cone 151, axial cylindrical surfaces 152 and 153. The upper ring wax mold 31 of the impeller 3 is placed on the tray 15. The upper ring wax mold 31 is provided with a blade positioning hole 311 and a circumferential positioning groove 312. The axial adjustment screw 13 is screwed into the screw hole 24 to push the tray 15 to slide along the axial cylindrical surfaces 22 and 25, so that the upper ring wax mold 31 of the impeller 3 contacts the positioning cone 151 of the tray 15, so as to realize the axial and radial positioning of the upper ring wax mold 31.

[0037] The base 2 is equipped with a blade wax mold 32 position adjustment mechanism, which includes a radial adjustment screw 1, a slider 4, an air flow control block 5, a radial position positioning block 9, a washer 11, a locking nut 12, and a center guide screw 14; the center guide screw 14 is screwed into the center screw hole 21 and contacts the upper plane 23 of the base 2 to realize the assembly and fixation of the center guide screw 14;

[0038] The slider 4 is provided with a waist-shaped slide groove 41, a positioning groove 42, screw holes 43 and 44; the waist-shaped slide groove 41 of the slider 4 is placed on the plane 23 through the central guide screw 14, the positioning groove 42 of the slider 4 is installed with the air flow positioning block 5, and the fixing screw 10 is screwed into the screw hole 43 for fixing; the base 2 is equipped with an air flow control block radial position positioning block 9, and the air flow control block radial position positioning block 9 is provided with a radial positioning surface 91, an axial positioning surface 92, and a positioning boss 93, and the positioning boss 93 of the radial position positioning block 9 is installed in the two blade positioning holes 311 of the upper ring wax mold 31, and the radial adjustment screw 1 is adjusted to make The slider 4 moves, the air flow control movable block 5 contacts the radial positioning surface 91 of the radial position positioning block 9, and the slider 4 is fixed with the washer 11 and the locking nut 12. The radial position positioning block 9 is taken out, and the blade wax mold 3 is placed in the blade positioning hole 311 of the upper ring wax mold 31. The upper ring wax mold 31 is rotated counterclockwise to make the blade wax mold 32 contact with the air flow control movable block 5, so as to realize the welding of the upper ring wax mold 31 and the blade wax mold 32. The upper ring wax mold 31 is rotated clockwise to install the blade wax mold 32 into the next hole, and then the upper ring wax mold 31 is rotated counterclockwise to make the blade wax mold 32 contact with the air flow control movable block 5, and the welding is continued until the welding of the blade wax mold 32 is completed.

[0039] The lower ring assembly welding device comprises a lower ring assembly welding device base 6, which mainly comprises a main body, a slide groove 61, a screw hole 62, an axial positioning surface 63, and a circumferential positioning groove 64; a position positioning block 8 is mounted on the lower ring assembly welding device base 6, and the position positioning block 8 is provided with a waist-shaped groove 81, an arc boss 82, concentricity positioning surfaces 83 and 85, and an axial positioning surface 84; the position positioning block 8 is installed on the slide groove 61 of the lower ring assembly welding device base 6, and the locking screw 7 passes through the waist-shaped groove 81 of the positioning block 8 and is screwed into the screw hole 62 for assembly; a lower ring wax mold 33 is mounted on the lower ring assembly welding device base 6, and the boss of the lower ring wax mold 33 is placed on the lower ring assembly welding device base 6. In the circumferential positioning groove 64 of the device base 6, the upper ring wax mold 16 with blades is placed above the lower ring wax mold 33, and the arc boss 82 on the positioning block 8 is aligned with the circumferential positioning groove 312 of the upper ring wax mold 31 to realize the circumferential positioning of the upper ring wax mold 16 with blades. The axial positioning surface 86 of the upper ring wax mold of the positioning block 8 is aligned with the wax mold plane of the upper ring wax mold 31 for axial height positioning, and the positioning block 8 is pushed to make the concentricity positioning surface 83 fit the upper ring wax mold 16 with blades and the concentricity positioning surface 85 fit the lower ring wax mold 33 for radial positioning, and the locking screw 7 is rotated to lock the positioning block 8 to realize the wax welding of the upper ring wax mold 16 with blades and the lower ring wax mold 33.

[0040] In order to adapt to the assembly welding of impellers with different gas flow rates, the gas flow control movable block 5 can be flexibly replaced according to the flow rate of the impeller of the same model.

[0041] In order to adapt to the impeller wax mold with different sizes, the radial adjustment screw 1 is rotated to achieve position adjustment.

[0042] In order to adapt to the assembly welding of impellers of different models of the same machine, the upper ring wax mold and the lower ring wax mold position positioning block 8 on the lower ring assembly welding device can be replaced according to the model.

[0043] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A wax pattern welding device for radial supercharger impeller, characterized in that: It includes a blade assembly welding device and a lower ring assembly welding device; The blade assembly welding device comprises a first base (2), a tray (15), and a radial position positioning block (9). The upper surface of the first base (2) is coaxially provided with an axial positioning plane (23), an annular groove, and an annular mounting surface from the inside to the outside. The annular groove has an inner axial cylindrical surface (25) and an outer axial cylindrical surface (22). The tray (15) is annular, and the upper end of its outer circumferential surface is provided with a positioning cone surface (151). The positioning cone surface (151) is used to cooperate with the lower end of the inner circumferential surface of the upper ring wax mold (31) for positioning. The lower end of its outer circumferential surface is provided with a positioning step surface (153). The positioning step surface (153) is aligned with the first base. The outer axial cylindrical surface (22) and the annular mounting surface of the tray (2) are matched for positioning, the tray inner circular surface (152) of the tray (15) is slidably matched with the inner axial cylindrical surface (25) of the first base (2), and the first base (2) is matched with an axial adjustment screw (13) along the vertical thread, and the axial adjustment screw (13) is used to push the tray (15) to slide along the inner axial cylindrical surface (25) and the outer axial cylindrical surface (22) of the first base (2), so that the upper ring wax mold (31) contacts the positioning conical surface (151) of the tray (15), thereby realizing the axial and radial positioning of the upper ring wax mold (31); The first base (2) is provided with a position adjustment mechanism, which includes a slider (4) and a center guide screw (14). The center guide screw (14) is fixed to the axial center of the axial positioning plane (23) along a vertical thread. One end of the slider (4) is provided with a waist-shaped slide groove (41). The end of the slider (4) is threaded with a radial adjustment screw (1). The other end of the slider (4) is provided with a positioning groove (42). The center guide screw (14) passes through the waist-shaped slide groove (41). A guide block is provided in the middle of the screw rod (14), and the guide block is slidably matched with the waist-shaped slide groove (41) of the slider (4) to form a guide for the slider (4) and axially position the central guide screw rod (14). The upper end thread of the central guide screw rod (14) is matched with a locking nut (12), and the locking nut (12) is used to fix the slider (4). The end of the radial adjustment screw rod (1) is pressed against the central guide screw rod (14) to move the slider (4). An air flow control movable block (5) is installed in the positioning groove (42); The radial position positioning block (9) is arc-shaped, the lower end surface of the radial position positioning block (9) is an axial positioning surface (92), a radial positioning plate is provided on the inner arc surface of the radial position positioning block (9), the inner arc surface of the radial positioning plate is a radial positioning surface (91), two positioning bosses (93) are provided at the bottom of the radial positioning plate, the two positioning bosses (93) are used to be installed in two blade positioning holes (311) of the upper ring wax mold (31) for positioning, and a notch is provided in the middle of the radial positioning plate, the notch cooperates with the end of the air flow control movable block (5) to jointly control the welding position and angle of the blade wax mold (32); The lower ring assembly welding device comprises a second base (6), the second base (6) is provided with a raised axial positioning surface (63), the raised axial positioning surface (63) is used to position the lower ring wax mold (33), the upper surface of the second base (6) is provided with three radially arranged slide grooves (61) and three circumferential positioning grooves (64) at staggered intervals, the three radially arranged slide grooves (61) and the three circumferential positioning grooves (64) are evenly distributed around the axial positioning surface (63) of the lower ring wax mold (33), the three circumferential positioning grooves (64) are used to cooperate with the boss of the lower ring wax mold (33) for positioning, each slide groove (61) is slidably matched with a position positioning block (8), the position positioning block (8) is L-shaped, and a waist-shaped groove (81) is provided on the flat section of the position positioning block (8), and the waist-shaped groove (81) passes through a locking screw (7), which is used to lock the radial position of the positioning block (8). The vertical wall surface of the positioning block (8) is provided with an arc boss (82), an upper concentricity positioning surface (83), a lower concentricity positioning surface (85), and an axial positioning surface (84). The arc boss (82) is used to engage with the circumferential positioning groove (312) of the upper ring wax mold (31) to form circumferential positioning. The axial positioning surface (84) of the positioning block (8) is used to align with the wax mold plane of the upper ring wax mold (31) for axial height positioning. The upper concentricity positioning surface (83) is used to fit the outer peripheral surface of the upper ring wax mold (16) with blades for radial positioning. The lower concentricity positioning surface (85) is used to fit the outer peripheral surface of the lower ring wax mold (33) for radial positioning.

2. A wax pattern welding device for radial supercharger impeller according to claim 1, characterized in that: The first base (2) is in the shape of a stepped shaft, and the axial adjustment screw (13) is threadedly engaged with the large diameter section of the first base (2) along the axial direction.

3. A wax pattern welding device for radial supercharger impeller according to claim 1, characterized in that: A fixing screw rod (10) is threadedly matched on the groove wall of the positioning groove (42), and the end of the fixing screw rod (10) is in contact with the air flow control movable block (5).

4. A wax pattern welding device for radial supercharger impeller according to claim 1, characterized in that: A notch is provided in the middle of the radial positioning plate, and the air flow control block (5) has the same end profile as the blade wax mold (32). The notch of the radial positioning plate, the end profile of the air flow control block (5), and the end profile of the blade wax mold (32) jointly control the welding position and angle of the blade wax mold (32).

5. A wax pattern welding device for radial supercharger impeller according to claim 1, characterized in that: A boss is provided between an upper concentricity positioning surface (83) and a lower concentricity positioning surface (85) of the position positioning block (8), and an upper end surface of the boss is an axial positioning surface (84) of the position positioning block (8).

6. A wax mold welding method using the wax mold welding device for radial supercharger impeller according to claim 1, wherein the impeller wax mold comprises an upper ring wax mold (31), a lower ring wax mold (33), and a blade wax mold (32), wherein the upper ring wax mold is provided with a blade positioning hole (311) and a circumferential positioning groove (312), and wherein: The upper ring wax mold (31) is placed upside down on the tray (15), and the axial adjustment screw (13) is rotated to push the tray (15) to slide upward along the inner axial cylindrical surface (25) and the outer axial cylindrical surface (22), so that the upper ring wax mold (31) contacts the positioning conical surface (151) of the tray (15), thereby achieving axial and radial positioning of the upper ring wax mold (31); Install the radial position positioning block (9), install the positioning boss (93) of the radial position positioning block (9) in the two adjacent blade positioning holes (311) of the upper ring wax mold (31), rotate the radial adjustment screw (1) to move the slider (4), the end of the air flow control movable block (5) contacts the radial positioning surface (91) of the radial position positioning block (9), fix the slider (4) with the locking nut (12), remove the radial position positioning block (9), and place the blade wax mold (32) on the upper ring wax mold (3 1), rotate the upper wax mold (31) counterclockwise to make the profile of the blade wax mold (32) contact the same end profile of the air flow control block (5) and the blade wax mold (32), press the blade wax mold (32) downward to make the end surface of the blade wax mold contact the plane where the blade positioning hole (311) is located to achieve welding of the upper wax mold (31) and the blade wax mold (32), rotate the upper wax mold (31) in the clockwise direction to complete the welding of each blade wax mold (32) in turn; The lower wax mold (33) is buckled onto the axial positioning surface (63) of the second base (6) to form radial positioning. The three bosses of the lower wax mold (33) are placed in the three circumferential positioning grooves (64) of the second base (6) to form circumferential positioning. The upper wax mold (16) with blades is placed above the lower wax mold (33). The arc bosses (82) on the position positioning block (8) are aligned and snapped into the circumferential positioning grooves (312) of the upper wax mold (31), so that the upper wax mold (16) is positioned. 6), the axial positioning surface (84) of the positioning block (8) is aligned with the wax mold plane of the upper ring wax mold (31) for axial height positioning, the positioning block (8) is pushed so that the upper concentricity positioning surface (83) fits the upper ring wax mold (16), and the lower concentricity positioning surface (85) fits the lower ring wax mold (33) for radial positioning, and the locking screw (7) is rotated to lock the positioning block (8), so as to realize the wax welding of the upper ring wax mold (16) with blades and the lower ring wax mold (33).

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