A processing method of a split casing

Abstract

The application discloses a processing method of a split machine box, which comprises the following steps: 1) component processing; 2) welding of a support plate; 3) welding of a horizontal flange; 4) welding of an insert block and a boss; 5) wire cutting; 6) welding of a partition plate; 7) machining; and 8) spraying. The processing method ensures the forming quality of the split machine box and greatly improves the processing qualified rate.

Description

Technical Field

[0001] This invention relates to the field of parts processing technology, and in particular to a method for processing a split housing. Background Technology

[0002] like Figure 2-4 The split-type turbine casing shown is a crucial component of the main power gas turbine, and its machining quality directly affects the turbine's performance. This split-type turbine casing has numerous components, complex machining processes, and a low yield rate. Therefore, a machining method for the split-type casing is designed to ensure machining quality and guarantee a high yield rate. Summary of the Invention

[0003] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a processing method for split-type gates, which ensures the forming quality of split-type gates and greatly improves the processing qualification rate.

[0004] This invention provides a method for processing a split housing, the split housing comprising a coaxial inner cylinder and an outer cylinder; a plurality of support plates are distributed circumferentially between the inner and outer cylinders; a top inner flange is provided at the top of the inner cylinder, and a bottom inner flange is provided at the bottom; a top outer flange is provided at the top of the outer cylinder, and a bottom outer flange is provided at the bottom; a plurality of bosses are provided circumferentially on the outer wall of the outer cylinder near the top; the outer cylinder comprises a first half-outer cylinder and a second half-outer cylinder symmetrically distributed on both sides, the first half-outer cylinder and the second half-outer cylinder being fixedly connected by a horizontal flange; the inner cylinder comprises a first half-inner cylinder and a second half-inner cylinder symmetrically distributed on the symmetrical faces of the first half-outer cylinder and the second half-outer cylinder, a first partition is provided between the first half-outer cylinder and the first half-inner cylinder on the same side near the second half-outer cylinder, and a second partition is provided between the second half-outer cylinder and the second half-inner cylinder on the same side near the first half-outer cylinder; the processing method includes the following steps:

[0005] 1) Component fabrication;

[0006] The inner cylinder, the first half of the outer cylinder, and the second half of the outer cylinder are machined, with the top inner flange, the bottom inner flange, the top outer flange, and the bottom outer flange having allowances in thickness and radial direction.

[0007] 2) Welding support plates;

[0008] The inner cylinder, the first half of the outer cylinder, and the second half of the outer cylinder are positioned and fixed using positioning fixtures, and the inner cylinder is supported between the first half of the outer cylinder and the second half of the outer cylinder. During the positioning and fixing process, each support plate is installed between the inner cylinder and the first half of the outer cylinder and the second half of the outer cylinder. Then, each support plate is welded one by one, and after welding, it is heat-treated to relieve stress.

[0009] 3) Weld horizontal flanges;

[0010] Remove the excess material from the top surface of the top outer flange by turning, and make positioning marks on the top surfaces of the top inner flange and the top outer flange; weld the first process block at the top and bottom between the first half outer cylinder and the second half outer cylinder; then fix and clamp the inner cylinder and the outer cylinder with clamping fixtures, and mill the welding windows on both sides between the first half outer cylinder and the second half outer cylinder with the positioning marks as the reference.

[0011] A notch is milled on the outer side of the top of any horizontal flange. Then, the two horizontal flanges are aligned and several second process blocks are welded on both sides and the bottom. First support rods are welded into the inner cylinder and between the inner cylinder and the outer cylinder. The first support rods are distributed on the symmetrical plane and located at the top and bottom of the split gate. The two horizontal flanges are welded to the first half of the outer cylinder and the second half of the outer cylinder in the welding window. After welding, heat treatment is performed to eliminate welding stress.

[0012] 4) Welding inserts and bosses;

[0013] Using the notch on the horizontal flange as a reference, mill positioning holes corresponding to the bosses one by one on the side wall of the outer cylinder, and weld the bosses to the corresponding positioning holes one by one; place an upper insert between the top of the horizontal flange and the corresponding top outer flange and weld it together; place a lower insert between the bottom of the horizontal flange and the corresponding bottom outer flange and weld it together.

[0014] 5) Wire cutting;

[0015] Second support rods are welded into the inner cylinder and between the inner and outer cylinders respectively. The second support rods are symmetrically distributed on both sides of the symmetry plane and located at the top and bottom of the split gate. The excess material on the bottom surface of the bottom inner flange and the bottom outer flange is removed by turning. The inner cylinder is wire-cut along the symmetry plane to decompose it into the first half of the inner cylinder and the second half of the inner cylinder. Then, the first process block and the second process block are removed by grinding.

[0016] 6) Welding partitions;

[0017] Milling partition grooves are performed between the first inner cylinder and the first outer cylinder, and between the second inner cylinder and the second outer cylinder. Each partition groove is then ground. The first partition and the second partition are placed into their respective partition grooves and welded together. After welding, heat treatment is performed to eliminate welding stress.

[0018] 7) Machining;

[0019] Remove the second support rod; mill the mating surfaces between the first half inner cylinder, the first half outer cylinder and the second half inner cylinder, and the second half outer cylinder, as well as the through holes on the horizontal flange; fix the corresponding horizontal flanges with bolts; fix the split-type gate with clamping fixtures; rough machine the allowance of each part, leaving a margin of 0.5-1.5mm; let it stand for 60-72 hours to release residual machining stress; finish machine the allowance of each part of the split-type gate, and finish mill the bosses and profiles; drill and bore the end holes on the top inner flange, top outer flange, and bottom outer flange; deburr and tap the end holes by fitter.

[0020] 8) Spraying: Spray a protective coating onto the outer surface of the split gate.

[0021] Furthermore, in step 1), the thickness allowance of the top inner flange, bottom inner flange, top outer flange, and bottom outer flange is 8-10mm, and the radial allowance is 4-5mm.

[0022] Furthermore, the positioning fixture includes:

[0023] The first base plate has an inner positioning step and an outer positioning step on its top surface. The outer diameter of the inner positioning step is in clearance fit with the inner diameter of the bottom inner flange, and the inner diameter of the outer positioning step is in clearance fit with the outer diameter of the bottom outer flange.

[0024] The support assembly includes several support plates fixedly disposed on the top surface of the first base plate, and the several support plates are evenly distributed circumferentially between the inner positioning step and the outer positioning step;

[0025] The first fixing component includes a plurality of first pressure plates evenly distributed on the inner periphery above the inner positioning step. One end of the first pressure plate presses against the bottom inner flange, and the bottom of the other end is provided with a first pad. The first pressure plate is connected to the inner positioning step by a first screw.

[0026] The second fixing component includes a plurality of second pressure plates evenly distributed on the outer periphery above the outer positioning step. One end of the second pressure plate presses against the bottom outer flange, and the bottom of the other end is provided with a second pad. The second pressure plate is connected to the outer positioning step by a second screw.

[0027] Furthermore, the positioning marks include scribing lines and reference holes; the top surface of the outer flange at the top is symmetrically provided with the scribing lines on both sides of the plane of symmetry; the top surfaces of the inner flange at the top and the outer flange at the top are respectively provided with reference holes on the plane of symmetry.

[0028] Furthermore, the clamping fixture includes:

[0029] The second base plate has a positioning step on its top surface. The outer diameter of the positioning step is clearance-fitted with the inner diameter of the bottom inner flange. The two sides of the second base plate are symmetrically provided with lower clearance grooves.

[0030] The fixing component includes a cover plate and a pull rod. The cover plate is disposed above the second base plate. Upper clearance grooves are formed on both sides of the cover plate corresponding to the lower clearance groove. Several pull rods are evenly distributed on the top surface of the second base plate around the positioning step. The top end of the pull rod slides through the cover plate and is threadedly connected to a nut. A disc spring is disposed between the nut and the cover plate.

[0031] Furthermore, both the first and second partitions have an 8-10mm margin on the side closest to the plane of symmetry.

[0032] Furthermore, in step 7), the mating surfaces are ground and colored to ensure that the alignment and fit of the mating surfaces is higher than 95%; the gap between the mating surfaces is detected by feeler gauge to ensure that there is no through gap.

[0033] Furthermore, the coating comprises a water-based high-temperature resistant coating and a sealing coating, and the thickness of the coating is 30-60 μm.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] The processing method of this invention is used to process and form a double-slit gate. First, the inner cylinder body with flanges leaving allowance, the first half of the outer cylinder, and the second half of the outer cylinder are machined. Then, the support plates are positioned and welded using positioning fixtures, ensuring the welding accuracy of the support plates. Next, the horizontal flanges are clamped and welding windows are opened using clamping fixtures, ensuring the welding accuracy of the horizontal flanges. Then, the inserts and bosses are welded according to the reference. Next, the inner cylinder body is decomposed into the first half of the inner cylinder and the second half of the inner cylinder using wire cutting, and then the partition plates are welded. Finally, the structural features of the double-slit gate are machined, and then a spray painting treatment is completed. The processing method of this application ensures the forming quality of the double-slit gate and greatly improves the processing qualification rate.

[0036] It should be understood that the description in the Summary of the Invention is not intended to limit the key or essential features of the embodiments of the present invention, nor is it intended to restrict the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0037] Other features, objects, and advantages of the invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0038] Figure 1 This is a flowchart of the machining method for the split-type casing;

[0039] Figure 2 This is a schematic diagram of the split-type casing;

[0040] Figure 3 This is a cross-sectional structural diagram of the split-type casing;

[0041] Figure 4 This is a schematic diagram showing the structure of the first half of the inner cylinder and the first half of the outer cylinder of the split-opening gate, which are separated from the second half of the inner cylinder and the second half of the outer cylinder.

[0042] Figure 5 This is a structural diagram of the positioning fixture;

[0043] Figure 6 This is a schematic diagram of the structure of the double-slit gate installed on the positioning fixture;

[0044] Figure 7 This is a cross-sectional structural diagram of the split-type gate installed on the positioning fixture;

[0045] Figure 8 This is a schematic diagram showing the location of the positioning marks on the gate.

[0046] Figure 9 This is a structural diagram of the clamping fixture;

[0047] Figure 10 A schematic diagram of the structure with welding windows for the split-type casing;

[0048] Figure 11 This is a schematic diagram of the structure of the welded horizontal flange of the split casing;

[0049] Figure 12 This is a schematic diagram showing the placement of the upper and lower inlays.

[0050] Labels in the diagram: 1. Split-type housing; 2. Positioning fixture; 3. Clamping fixture; 4. First process block; 5. Welding window; 6. Second process block; 7. First support rod; 8. Second support rod; 9. Positioning mark;

[0051] 11. First half of the inner cylinder; 12. Second half of the inner cylinder; 13. First half of the outer cylinder; 14. Second half of the outer cylinder; 15. Support plate; 16. Top inner flange; 17. Bottom inner flange; 18. Top outer flange; 19. Bottom outer flange; 110. Boss; 111. Horizontal flange; 112. First partition plate; 113. Second partition plate; 114. Notch; 115. Positioning hole; 116. Upper insert; 117. Lower insert; 118. End hole;

[0052] 21. First base plate; 22. Inner positioning step; 23. Outer positioning step; 24. Support plate; 25. First pressure plate; 26. First pad; 27. First screw; 28. Second pressure plate; 29. ​​Second pad; 210. Second screw;

[0053] 31. Second base plate; 32. Positioning step; 33. Lower clearance groove; 34. Cover plate; 35. Tie rod; 36. Upper clearance groove; 37. Nut; 38. Disc spring;

[0054] 91. Scribing line; 92. Reference hole. Detailed Implementation

[0055] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0056] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0057] Please refer to Figures 1-12 An embodiment of the present invention provides a method for processing a split housing. The split housing 1 includes a coaxial inner cylinder and an outer cylinder; a plurality of support plates 15 are distributed circumferentially between the inner cylinder and the outer cylinder; a top inner flange 16 is provided at the top of the inner cylinder and a bottom inner flange 17 is provided at the bottom; a top outer flange 18 is provided at the top of the outer cylinder and a bottom outer flange 19 is provided at the bottom; a plurality of bosses 110 are provided circumferentially on the outer wall of the outer cylinder near the top; the outer cylinder includes a first half outer cylinder 13 and a second half outer cylinder 13 symmetrically distributed on the left and right sides. 14. The first half of the outer cylinder 13 and the second half of the outer cylinder 14 are fixedly connected by a horizontal flange 111; the inner cylinder includes a first half of the inner cylinder 11 and a second half of the inner cylinder 12 symmetrically distributed on the symmetrical planes of the first half of the outer cylinder 13 and the second half of the outer cylinder 14. A first partition 112 is provided between the first half of the outer cylinder 13 and the first half of the inner cylinder 11 on the same side near the second half of the outer cylinder 14, and a second partition 113 is provided between the second half of the outer cylinder 14 and the second half of the inner cylinder 12 on the same side near the first half of the outer cylinder 13; the processing method includes the following steps:

[0058] 1) Component fabrication;

[0059] The inner cylinder, the first half of the outer cylinder 13, and the second half of the outer cylinder 14 are machined, wherein the top inner flange 16, the bottom inner flange 17, the top outer flange 18, and the bottom outer flange 19 are reserved with allowances in thickness and radial direction.

[0060] 2) Welding support plate 15;

[0061] The inner cylinder, the first half of the outer cylinder 13, and the second half of the outer cylinder 14 are positioned and fixed by the positioning fixture 2, and the inner cylinder is supported between the first half of the outer cylinder 13 and the second half of the outer cylinder 14. During the positioning and fixing process, each support plate 15 is installed between the inner cylinder and the first half of the outer cylinder 13 and the second half of the outer cylinder 14. Then, each support plate 15 is welded one by one, and after welding, it is heat-treated to relieve stress.

[0062] 3) Welding horizontal flange 111;

[0063] Remove the excess material from the top surface of the top outer flange 18 by turning, and make positioning marks 9 on the top surfaces of the top inner flange 16 and the top outer flange 18; weld the first process block 4 at the top and bottom between the first half outer cylinder 13 and the second half outer cylinder 14; then fix and clamp the inner cylinder and the outer cylinder by using the clamping fixture 3, and mill the welding window 5 on both sides between the first half outer cylinder 13 and the second half outer cylinder 14 with the positioning marks 9 as the reference.

[0064] A notch 114 is milled on the outer side of the top of any horizontal flange 111. Then, the two horizontal flanges 111 are aligned and several second process blocks 6 are welded on both sides and the bottom. First support rods 7 are welded into the inner cylinder and between the inner cylinder and the outer cylinder. The first support rods 7 are distributed on the symmetrical plane and located at the top and bottom of the split gate 1. The two horizontal flanges 111 are welded to the first half outer cylinder 13 and the second half outer cylinder 14 in a one-to-one correspondence within the welding window 5. After welding, heat treatment is performed to eliminate welding stress.

[0065] 4) Welding inserts and bosses 111;

[0066] Using the notch 114 on the horizontal flange 111 as a reference, positioning holes 115 corresponding to the bosses 110 are milled on the side wall of the outer cylinder, and the bosses 110 are welded to the corresponding positioning holes 115 one by one; an upper insert 116 is placed between the top of the horizontal flange 111 and the corresponding top outer flange 18 and welded together; a lower insert 117 is placed between the bottom of the horizontal flange 111 and the corresponding bottom outer flange 19 and welded together.

[0067] 5) Wire cutting;

[0068] A second support rod 8 is welded into the inner cylinder and between the inner and outer cylinders. The second support rods 8 are symmetrically distributed on both sides of the symmetrical plane, located at the top and bottom of the split gate 1. The excess material on the bottom surface of the bottom inner flange 17 and the bottom outer flange 19 is removed by turning. The inner cylinder is wire-cut along the symmetrical plane to decompose it into the first half inner cylinder 11 and the second half inner cylinder 12. Then, the first process block 4 and the second process block 6 are removed by grinding.

[0069] 6) Welding partitions;

[0070] Divider grooves are milled between the first inner cylinder 11 and the first outer cylinder 13, and between the second inner cylinder 12 and the second outer cylinder 14. Each partition groove is ground, and the first partition 112 and the second partition 113 are respectively placed into the corresponding partition grooves and welded together. After welding, heat treatment is performed to eliminate welding stress.

[0071] 7) Machining;

[0072] Remove the second support rod 8; mill the mating surfaces between the first half inner cylinder 11, the first half outer cylinder 13 and the second half inner cylinder 12, the second half outer cylinder 14, and the through holes on the horizontal flange 111; fix the corresponding horizontal flange 111 with bolts; fix the split gate 1 with the clamping fixture 3, rough machine the allowance of each part, leaving a margin of 0.5-1.5mm; let it stand for 60-72 hours to release residual machining stress; finish machine the allowance of each part of the split gate 1, and finish mill the boss 110 and the profile; drill and bore the end holes 118 on the top inner flange 16, the top outer flange 18 and the bottom outer flange 19; deburr and tap the end holes 118 by fitter.

[0073] 8) Spraying: Spray a protective coating on the outer surface of the split gate 1.

[0074] In this embodiment, when the gate 1 is machined, the inner cylinder body with a margin, the first half of the outer cylinder 13 and the second half of the outer cylinder 14 are machined first; the margin is removed in subsequent machining to offset the slight deformation caused during the machining process.

[0075] Then, the support plate 15 is positioned and welded using the positioning fixture 2, ensuring the welding accuracy of the support plate 15; next, the first process block 4 is welded to strengthen the structure and reduce deformation after subsequent window opening; at this time, the first support rod 7 is welded to the top and bottom of the split gate 1 respectively, forming a support inside the split gate 1, which can effectively prevent the problem of shrinkage and deformation of parts when welding the horizontal flange 111, ensuring the welding quality; then, the clamping fixture 3 is used to clamp and open the welding window 5, and then each horizontal flange 111 is welded; the horizontal flange 111 is a plate-shaped strip connector with through holes for bolt fixing of two components; after the two horizontal flanges 111 are attached together and aligned, they are fixed by the second process block 6, ensuring the welding quality and accuracy of the horizontal flange 111;

[0076] Then, according to the reference, weld the upper insert 116 and the lower insert 117 to fill the gap between the horizontal flange 111 and the top outer flange 18 and the bottom outer flange 19; then open the positioning hole 115 and weld the boss 110 to ensure the welding accuracy of the boss 110.

[0077] Then, second support rods 8 are welded to the top and bottom of both sides of the symmetrical plane to support the interior of the split-type gate 1, preventing deformation after wire cutting due to lack of internal support. At this point, the inner cylinder is decomposed into a first half-inner cylinder 11 and a second half-inner cylinder 12 through wire cutting. Then, the partition is welded, providing support to the inner side of the split-type gate 1, allowing the removal of the second support rods 8. Finally, the structural features of the split-type gate 1 are machined and painted. The processing method of this application ensures the forming quality of the split-type gate 1 and greatly improves the processing qualification rate.

[0078] In a preferred embodiment, in step 1), the thickness allowance for the top inner flange 16, the bottom inner flange 17, the top outer flange 18, and the bottom outer flange 19 is 8-10 mm, and the radial allowance is 4-5 mm. This allowance is appropriate, and after machining removal, it can effectively offset minor deformation of the parts.

[0079] In a preferred embodiment, such as Figures 5-7 As shown, the positioning fixture 2 includes:

[0080] The first base plate 21 has an inner positioning step 22 and an outer positioning step 23 on its top surface. The outer diameter of the inner positioning step 22 is clearance-fitted with the inner diameter of the bottom inner flange 17, and the inner diameter of the outer positioning step 23 is clearance-fitted with the outer diameter of the bottom outer flange 19.

[0081] The support assembly includes several support plates 24 fixedly disposed on the top surface of the first base plate 21, and the several support plates 24 are evenly distributed circumferentially between the inner positioning step 22 and the outer positioning step 23.

[0082] The first fixing component includes a plurality of first pressure plates 25 evenly distributed on the inner periphery above the inner positioning step 22. One end of the first pressure plate 25 presses against the bottom inner flange 17, and the bottom of the other end is provided with a first pad 26. The first pressure plate 25 is connected to the inner positioning step 22 by a first screw 27.

[0083] The second fixing component includes several second pressure plates 28 evenly distributed on the outer periphery above the outer positioning step 23. One end of the second pressure plate 28 presses against the bottom outer flange 19, and the bottom of the other end is provided with a second pad 29. The second pressure plate 28 is connected to the outer positioning step 23 by a second screw 210.

[0084] In this embodiment, when welding the support plate 15, the inner cylinder is first fastened onto the inner positioning step 22, and then the bottom inner flange 17 is pressed and fixed by the first pressure plate 25; then the support plate 15 is assembled onto one side of the inner cylinder, and the bottom outer flange 19 of the first outer cylinder 13 is embedded into the outer positioning step 23, and then the support plate 15 on the other side and the second outer cylinder 14 are placed; then the bottom outer flange 19 is pressed and fixed by the second pressure plate 28, and the support plate 15 can be welded and connected at this time. The positioning is accurate, ensuring the welding quality of the support plate 15.

[0085] In a preferred embodiment, such as Figure 8 As shown, the positioning mark 9 includes a scribing line 91 and a reference hole 92; the top surface of the top outer flange 18 is symmetrically provided with scribing lines 91 on both sides of the plane of symmetry; the top surfaces of the top inner flange 16 and the top outer flange 18 are respectively provided with reference holes 92 on the plane of symmetry, which serve as the reference for subsequent window opening and ensure the positional accuracy of the welding window 5 processing.

[0086] In a preferred embodiment, such as Figure 9 and Figure 10 As shown, the clamping fixture 3 includes:

[0087] The second base plate 31 has a positioning step 32 on its top surface. The outer diameter of the positioning step 32 is clearance-fitted with the inner diameter of the bottom inner flange 17. The second base plate 31 has symmetrical lower clearance grooves 33 on both sides.

[0088] The fixing component includes a cover plate 34 and a pull rod 35. The cover plate 34 is disposed above the second base plate 31. The two sides of the cover plate 34 are provided with upper clearance grooves 36 corresponding to the lower clearance grooves 33. Several pull rods 35 are evenly distributed on the top surface of the second base plate 31 on the outer periphery of the positioning step 32. The top of the pull rod 35 slides through the cover plate 34 and is threadedly connected to a nut 37. A disc spring 38 is provided between the nut 37 and the cover plate 34.

[0089] In this embodiment, when welding the horizontal flange 111, the bottom inner flange 17 is first positioned on the positioning step 32; then the split gate 1 is rotated so that the welding window 5 is aligned with the lower clearance groove 33 and the upper clearance groove 36, and then the cover plate 34 is fastened on the top of the split gate 1 and locked and fixed by the nut 37. The disc spring 38 ensures the fixing effect of the nut 37.

[0090] In a preferred embodiment, both the first partition 112 and the second partition 113 have an allowance of 8-10 mm on the side closest to the plane of symmetry. Removing this allowance during machining of the mating surfaces can effectively eliminate minor deformation caused by welding.

[0091] In a preferred embodiment, in step 7), the mating surfaces are ground and colored to ensure that the alignment and fit of the mating surfaces is higher than 95%; the gap between the mating surfaces is checked with a feeler gauge to ensure that there is no through gap. The parts are inspected to ensure their processing quality.

[0092] In a preferred embodiment, the coating comprises a water-based high-temperature resistant coating and a sealing coating, and the coating thickness is 30-60 μm.

[0093] In the description of this specification, the terms "connection," "installation," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0094] In the description of this specification, the terms "one embodiment," "some embodiments," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0095] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for processing a split housing, the split housing (1) comprising a coaxial inner cylinder and an outer cylinder; a plurality of support plates (15) are distributed circumferentially between the inner cylinder and the outer cylinder; the inner cylinder is provided with a top inner flange (16) at the top and a bottom inner flange (17) at the bottom; the outer cylinder is provided with a top outer flange (18) at the top and a bottom outer flange (19) at the bottom; a plurality of bosses (110) are provided circumferentially near the top of the outer wall of the outer cylinder; the outer cylinder comprises a first half outer cylinder (13) and a second half outer cylinder (14) symmetrically distributed on the left and right sides, the first half outer cylinder (13) and the second half of the outer cylinder (14) are fixedly connected by a horizontal flange (111); the inner cylinder includes a first half of the inner cylinder (11) and a second half of the inner cylinder (12) symmetrically distributed on the symmetrical planes of the first half of the outer cylinder (13) and the second half of the outer cylinder (14), a first partition (112) is provided between the first half of the outer cylinder (13) and the first half of the inner cylinder (11) on the same side near the second half of the outer cylinder (14), and a second partition (113) is provided between the second half of the outer cylinder (14) and the second half of the inner cylinder (12) on the same side near the first half of the outer cylinder (13); characterized in that, The processing method includes the following steps: 1) Component fabrication; The inner cylinder, the first half of the outer cylinder (13), and the second half of the outer cylinder (14) are machined, wherein the top inner flange (16), the bottom inner flange (17), the top outer flange (18), and the bottom outer flange (19) are reserved with allowance in thickness and radial direction. 2) Welding support plate (15); The inner cylinder, the first half of the outer cylinder (13), and the second half of the outer cylinder (14) are positioned and fixed by the positioning fixture (2), and the inner cylinder is supported between the first half of the outer cylinder (13) and the second half of the outer cylinder (14); during the positioning and fixing process, each support plate (15) is installed between the inner cylinder and the first half of the outer cylinder (13) and the second half of the outer cylinder (14); then each support plate (15) is welded one by one, and after welding, it is heat-treated to relieve stress; 3) Welding horizontal flange (111); Remove the excess material from the top surface of the top outer flange (18) by turning, and make positioning marks (9) on the top surfaces of the top inner flange (16) and the top outer flange (18); weld the first process block (4) at the top and bottom between the first half outer cylinder (13) and the second half outer cylinder (14); then fix the inner cylinder and the outer cylinder by using the clamping fixture (3), and mill the welding window (5) on both sides between the first half outer cylinder (13) and the second half outer cylinder (14) with the positioning mark (9) as the reference. A notch (114) is milled on the outer side of the top of any horizontal flange (111). Then, the two horizontal flanges (111) are aligned and several second process blocks (6) are welded on both sides and the bottom. First support rods (7) are welded into the inner cylinder and between the inner cylinder and the outer cylinder respectively. The first support rods (7) are distributed on the symmetrical plane and located at the top and bottom of the split gate (1). The two horizontal flanges (111) are welded to the first half outer cylinder (13) and the second half outer cylinder (14) in the welding window (5) one by one. After welding, heat treatment is performed to eliminate welding stress. 4) Welding inserts and bosses (110); Using the notch (114) on the horizontal flange (111) as a reference, positioning holes (115) corresponding to the boss (110) are milled on the side wall of the outer cylinder, and the boss (110) is welded to the corresponding positioning hole (115) one by one; an upper insert (116) is placed between the top of the horizontal flange (111) and the corresponding top outer flange (18) and welded together; a lower insert (117) is placed between the bottom of the horizontal flange (111) and the corresponding bottom outer flange (19) and welded together. 5) Wire cutting; Weld a second support rod (8) into the inner cylinder and between the inner and outer cylinders respectively. The second support rod (8) is symmetrically distributed on both sides of the symmetrical plane, located at the top and bottom of the split gate (1). Remove the excess material from the bottom surface of the bottom inner flange (17) and the bottom outer flange (19) by turning. Perform wire cutting along the symmetrical plane to decompose the inner cylinder into the first half inner cylinder (11) and the second half inner cylinder (12). Then grind away each of the first process blocks (4) and the second process blocks (6). 6) Welding partitions; Divider grooves are milled between the first half inner cylinder (11) and the first half outer cylinder (13), and between the second half inner cylinder (12) and the second half outer cylinder (14). Each partition groove is ground, and the first partition (112) and the second partition (113) are respectively placed into the corresponding partition grooves and welded together. After welding, heat treatment is performed to eliminate welding stress. 7) Machining; Remove the second support rod (8), mill the mating surfaces between the first half inner cylinder (11), the first half outer cylinder (13), the second half inner cylinder (12), and the second half outer cylinder (14), as well as the through holes on the horizontal flange (111); fix the corresponding horizontal flange (111) with bolts; fix the split gate (1) with the clamping fixture (3), rough machine the allowance of each part, and retain a allowance of 0.5-1.5mm; let it stand for 60-72 hours to release the residual machining stress; finish machine the allowance of each part of the split gate (1), and finish mill the boss (110) and profile; drill and bore the end holes (118) on the top inner flange (16), top outer flange (18), and bottom outer flange (19); deburr and tap the end holes (118) by fitter; 8) Spraying: Spray a protective coating on the outer surface of the split gate (1).

2. The processing method of the split casing according to claim 1, characterized in that, In step 1), the thickness allowance of the top inner flange (16), bottom inner flange (17), top outer flange (18) and bottom outer flange (19) is 8-10 mm, and the radial allowance is 4-5 mm.

3. The processing method of the split-type casing according to claim 1, characterized in that, The positioning fixture (2) includes: The first base plate (21) has an inner positioning step (22) and an outer positioning step (23) on its top surface. The outer diameter of the inner positioning step (22) is in clearance fit with the inner diameter of the bottom inner flange (17), and the inner diameter of the outer positioning step (23) is in clearance fit with the outer diameter of the bottom outer flange (19). The support assembly includes several support plates (24) fixedly disposed on the top surface of the first base plate (21), and the several support plates (24) are evenly distributed circumferentially between the inner positioning step (22) and the outer positioning step (23); The first fixing component includes a plurality of first pressure plates (25) evenly distributed on the inner periphery above the inner positioning step (22). One end of the first pressure plate (25) presses on the bottom inner flange (17), and the bottom of the other end is provided with a first pad (26). The first pressure plate (25) is connected to the inner positioning step (22) by a first screw (27). The second fixing component includes a plurality of second pressure plates (28) evenly distributed on the outer periphery above the outer positioning step (23). One end of the second pressure plate (28) presses on the bottom outer flange (19), and the bottom of the other end is provided with a second pad (29). The second pressure plate (28) is connected to the outer positioning step (23) by a second screw (210).

4. The processing method of the split casing according to claim 1, characterized in that, The positioning mark (9) includes a scribing line (91) and a reference hole (92); the top surface of the top outer flange (18) is symmetrically provided with the scribing line (91) on both sides of the symmetry plane; the top surfaces of the top inner flange (16) and the top outer flange (18) are respectively provided with the reference hole (92) on the symmetry plane.

5. The processing method of the split casing according to claim 1, characterized in that, The clamping fixture (3) includes: The second base plate (31) has a positioning step (32) on its top surface. The outer diameter of the positioning step (32) is clearance-fitted with the inner diameter of the bottom inner flange (17). The second base plate (31) has symmetrical lower clearance grooves (33) on both sides. The fixing component includes a cover plate (34) and a pull rod (35). The cover plate (34) is disposed above the second base plate (31). The cover plate (34) has upper clearance grooves (36) on both sides corresponding to the lower clearance groove (33). The top surface of the second base plate (31) is evenly distributed with a plurality of pull rods (35) on the outer periphery of the positioning step (32). The top end of the pull rod (35) slides through the cover plate (34) and is threadedly connected to a nut (37). A disc spring (38) is disposed between the nut (37) and the cover plate (34).

6. The processing method of the split casing according to claim 1, characterized in that, Both the first partition (112) and the second partition (113) have a margin of 8-10mm on the side closest to the symmetrical plane.

7. The processing method of the split casing according to claim 1, characterized in that, In step 7), the mating surfaces are ground and colored to ensure that the alignment and fit of the mating surfaces is higher than 95%; the gap between the mating surfaces is detected by feeler gauge to ensure that there is no through gap.

8. The processing method of the split casing according to claim 1, characterized in that, The coating includes a water-based high-temperature resistant coating and a sealing coating, and the thickness of the coating is 30-60 μm.

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