Manufacturing method of three-dimensional flow impeller of large centrifugal blower

Abstract

The invention belongs to the technical field of fan manufacturing, and particularly relates to a manufacturing method of a three-dimensional flow impeller of a large centrifugal blower, which comprises manufacturing of a hub, three-dimensional flow blades, an impeller cover and an impeller. The manufacturing process of the hub comprises the steps that the whole hub is forged, rough turning is conducted according to the drawing size, and three-dimensional flow blade molded line position scribing is conducted according to a scribing die; the manufacturing process of the three-dimensional flow blade comprises the steps that blanking is conducted, pressing forming of the three-dimensional flow blade is conducted through a blade pressing die, and the three-dimensional flow blade is polished; the manufacturing process of the wheel cover comprises the steps that an integral wheel cover forging stock is forged, and rough turning is conducted according to the drawing size; the manufacturing process of the impeller comprises the steps that the hub and the three-dimensional flow blade are welded, the molded line of the three-dimensional flow blade is turned, the three-dimensional flow blade and the impeller cover are welded, polishing and correction are conducted, and vertical lathe machining is conducted. Compared with the prior art, the machining cost can be reduced, the machining time can be saved, and meanwhile the yield can be well guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of fan manufacturing, and in particular to a method for manufacturing a three-dimensional flow impeller of a large centrifugal blower. Background Art

[0002] The impeller is the core equipment of the centrifugal blower. The impeller has become the development direction of multi-stage centrifugal blowers due to its advantages of small flow loss and high aerodynamic efficiency. The processing and manufacturing of large welded impellers has also become our research direction.

[0003] Now more technologies are to integrally mill the three-dimensional flow blades and the hub, and weld the impeller and wheel cover parts. The advantages of integrally milled impellers are high precision and small flow loss, but it also has the disadvantages of high cost and long cycle. Therefore, it is necessary to develop a manufacturing method for impellers that can reduce costs and save processing time. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention develops a method for manufacturing a three-dimensional flow impeller for a large centrifugal blower, which can reduce processing costs, save processing time, and also can well ensure the yield rate.

[0005] The technical solution to the technical problem of the present invention is: a method for manufacturing a three-dimensional flow impeller of a large centrifugal blower, including manufacturing a hub, three-dimensional flow blades, a wheel cover and an impeller; The manufacturing process of the wheel hub is as follows: integral wheel hub forging, rough turning according to the drawing size, marking the position of the three-dimensional flow blade line according to the marking die; The manufacturing process of the three-dimensional flow blade is as follows: cutting, pressing and forming the three-dimensional flow blade with a blade pressing die, and polishing the three-dimensional flow blade; The manufacturing process of the wheel cover is as follows: forging the integral wheel cover forging blank, and rough turning according to the drawing size; The manufacturing process of the impeller is as follows: welding of the hub and the three-dimensional flow blade, machining of the three-dimensional flow blade profile, welding of the three-dimensional flow blade and the wheel cover, grinding and correction, and vertical lathe processing.

[0006] Preferably, the rough turning in the wheel hub manufacturing process and the wheel cover manufacturing process needs to leave enough margin to ensure that no deformation occurs during welding.

[0007] Preferably, the specific operation of cutting in the manufacturing of the three-dimensional flow blade is: three-dimensional flattening is performed according to the three-dimensional flow blade, and laser cutting is performed according to the two-dimensional flattening diagram of the three-dimensional flow blade.

[0008] Preferably, during the manufacturing of the three-dimensional flow blade, the three-dimensional flow blade is polished to obtain a fillet on the leading edge of the three-dimensional flow blade.

[0009] Preferably, the specific operation of welding the hub and the three-dimensional flow blades in the impeller manufacturing process is: placing the hub on the welding platform, spot welding the three-dimensional flow blades to the hub in sequence according to the markings on the hub, connecting the leading edges of the three-dimensional flow blades together at one time with tie rods, and then welding all the three-dimensional flow blades to the hub in sequence.

[0010] Preferably, in the impeller manufacturing process, a symmetrical welding method is used for welding the three-dimensional flow blades and the hub.

[0011] Preferably, in the impeller manufacturing process, after the three-dimensional flow blade profile machining operation is completed, the tie rods are removed and the welding points are ground off.

[0012] Preferably, the specific operation of welding the three-dimensional flow blades and the wheel cover in the impeller manufacturing process is: assemble the wheel cover and the hub, spot weld the three-dimensional flow blades and the wheel cover, then weld the welds of the three-dimensional flow blades and the wheel cover, and after welding, grind the welds and remove the welding slag.

[0013] Preferably, the welding operation is performed by sequentially welding on both sides according to the principle of symmetry.

[0014] The effects provided in the content of the invention are only the effects of the embodiments, rather than all the effects of the invention. The above technical solution has the following advantages or beneficial effects: 1. The present invention adopts the three-section welding of the hub, the three-dimensional flow blade and the wheel cover, which can ensure that the fan impeller maintains efficient operation while reducing the processing cost and shortening the processing time; 2. By leaving enough margin during rough turning, it can be ensured that welding will not be deformed, thus improving the yield rate; 3. In the impeller manufacturing process, after the three-dimensional flow blades are spot-welded and fixed, the use of tie bars to connect all the three-dimensional flow blades can effectively prevent deformation during the welding process and improve the processing accuracy; 4. Symmetrical welding is used when welding the three-dimensional flow blades and the hub in the impeller manufacturing process to prevent thermal deformation during the welding process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the overall structure diagram of the impeller.

[0016] Among them: 1. wheel cover; 2. three-dimensional flow blade; 3. wheel hub. DETAILED DESCRIPTION

[0017] In order to clearly illustrate the technical features of the present invention, the present invention is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0018] Example 1 See also Figure 1, a method for manufacturing a three-dimensional flow impeller of a large centrifugal blower, comprising manufacturing a hub 3, a three-dimensional flow blade 2, a wheel cover 1 and an impeller; The manufacturing process of the wheel hub 3 is as follows: the integral wheel hub 3 is forged, and after forging, it is rough-turned according to the drawing size. A sufficient margin needs to be left in the rough-turning to ensure that no deformation occurs during welding. The next step is to turn down and mark the blade profile position according to the marking die; The manufacturing process of the three-dimensional flow blade 2 is as follows: three-dimensionally flatten the three-dimensional flow blade 2, perform laser cutting according to the two-dimensional flattening diagram of the three-dimensional flow blade 2, press-form the three-dimensional flow blade 2 with a blade pressing mold to ensure the precision of the pressing and forming, and then polish the three-dimensional flow blade 2, and the polishing of the three-dimensional flow blade 2 must polish out the front edge fillet of the three-dimensional flow blade 2; The manufacturing process of the wheel cover 1 is as follows: placing the wheel hub 3 on the welding platform, spot welding the three-dimensional flow blades 2 to the wheel hub 3 in sequence according to the markings on the wheel hub 3, connecting the leading edge positions of the three-dimensional flow blades 2 together at one time with tie bars, and then welding all the three-dimensional flow blades 2 to the wheel hub 3 in sequence. The three-dimensional flow blades 2 and the wheel hub 3 are welded by a symmetrical welding method, and rough turning is performed according to the drawing size. Sufficient margin needs to be left for rough turning to ensure that no deformation occurs during welding; The manufacturing process of the impeller is as follows: welding the hub 3 and the three-dimensional flow blade 2, turning the three-dimensional flow blade 2 profile and removing the tie rods and grinding off the welding points after completion, assembling the wheel cover 1 and the hub 3, spot welding the three-dimensional flow blade 2 and the wheel cover 1, and then double-sidedly welding the welds of the three-dimensional flow blade 2 and the wheel cover 1 in sequence according to the principle of symmetry, grinding the welds after welding, removing the welding slag, grinding and correction, and performing vertical lathe processing to meet the size requirements of the drawing.

[0019] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Based on the technical solution of the present invention, various modifications or variations that can be made by those skilled in the art without creative work are still within the scope of protection of the present invention.

Claims

1. A method for manufacturing a three-dimensional flow impeller for a large centrifugal blower, characterized in that: It includes the manufacture of a hub (3), a three-dimensional flow blade (2), a wheel cover (1) and an impeller; The manufacturing process of the wheel hub (3) is as follows: the integral wheel hub (3) is forged, rough turning is performed according to the size of the drawing, and the position of the line of the three-dimensional flow blade (2) is marked according to the marking die; The manufacturing process of the three-dimensional flow blade (2) is as follows: cutting, pressing and forming the three-dimensional flow blade (2) using a blade pressing mold, and polishing the three-dimensional flow blade (2); The manufacturing process of the wheel cover (1) is as follows: the integral wheel cover (1) is forged by forging a forging blank and rough-turned according to the dimensions of the drawing; The manufacturing process of the impeller is as follows: welding the hub (3) and the three-dimensional flow blade (2), turning the profile of the three-dimensional flow blade (2), welding the three-dimensional flow blade (2) and the wheel cover (1), grinding and correction, and performing vertical turning.

2. The method for manufacturing a three-dimensional flow impeller for a large centrifugal blower according to claim 1, characterized in that: The rough turning in the manufacturing process of the wheel hub (3) and the manufacturing process of the wheel cover (1) needs to leave enough margin to ensure that deformation does not occur during welding.

3. The method for manufacturing a three-dimensional flow impeller for a large centrifugal blower according to claim 1, characterized in that: The specific operation of cutting materials in the manufacturing of the three-dimensional flow blade (2) is: three-dimensional flattening is performed according to the three-dimensional flow blade (2), and laser cutting is performed according to the two-dimensional flattening diagram of the three-dimensional flow blade (2).

4. The method for manufacturing a three-dimensional flow impeller for a large centrifugal blower according to claim 1, characterized in that: During the manufacturing of the three-dimensional flow blade (2), the three-dimensional flow blade (2) must be polished to produce a rounded corner on the leading edge of the three-dimensional flow blade (2).

5. The method for manufacturing a three-dimensional flow impeller for a large centrifugal blower according to claim 1, characterized in that: The specific operation of welding the wheel hub (3) and the three-dimensional flow blades (2) in the impeller manufacturing process is as follows: placing the wheel hub (3) on a welding platform, spot welding the three-dimensional flow blades (2) to the wheel hub (3) in sequence according to the markings on the wheel hub (3), connecting the leading edge positions of the three-dimensional flow blades (2) together at one time with tie rods, and then welding all the three-dimensional flow blades (2) to the wheel hub (3) in sequence.

6. The method for manufacturing a three-dimensional flow impeller for a large centrifugal blower according to claim 5, characterized in that: In the impeller manufacturing process, a symmetrical welding method is used when welding the three-dimensional flow blade (2) and the hub (3).

7. The method for manufacturing a three-dimensional flow impeller for a large centrifugal blower according to claim 5, characterized in that: In the impeller manufacturing process, after the operation of turning the three-dimensional flow blade (2) profile is completed, the tie rods are removed and the welding points are ground off.

8. The method for manufacturing a three-dimensional flow impeller for a large centrifugal blower according to claim 1, characterized in that: The specific operation of welding the three-dimensional flow blade (2) and the wheel cover (1) in the impeller manufacturing process is: assembling the wheel cover (1) and the wheel hub (3), spot welding the three-dimensional flow blade (2) and the wheel cover (1), then welding the weld between the three-dimensional flow blade (2) and the wheel cover (1), and grinding the weld after welding to remove welding slag.

9. The method for manufacturing a three-dimensional flow impeller for a large centrifugal blower according to claim 7, characterized in that: The welding operation is performed by double-sided welding in sequence according to the principle of symmetry.

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