Method for preventing stainless steel ring from being stuck in flow channel of double-flow stainless steel volute

Abstract

The present application relates to a method for preventing stainless steel ring from being stuck in the flow channel of double-flow stainless steel volute, which comprises rough boring the stepped hole of the volute to be processed and reserving a predetermined length of excess at the root of the stepped hole on the upper end surface of the flow channel; and finish turning the stepped hole to remove the reserved excess. The method effectively prevents iron ring and long iron chips from being stuck in the flow channel of the volute during processing, thereby avoiding complaints and unnecessary losses at the customer end. The rough boring and finish turning are carried out in two steps, and the reasonable reservation of processing excess makes the processing process more efficient and reduces repeated processing and material waste.

Description

Technical Field

[0001] This invention relates to the field of volute processing technology, and in particular to a method for preventing stainless steel rings from getting stuck inside the flow channels of a dual-flow-channel stainless steel volute. Background Technology

[0002] Dual-channel stainless steel turbine housings possess high strength and toughness, but their flow channel structure is complex and the space is confined. During machining, due to the characteristics of stainless steel, rough machining is typically performed first to reduce machining allowance, followed by finish machining. When boring reaches the root of the stepped hole on the upper end face of the flow channel, if the machining allowance is too small, the material cannot withstand the pressure and cutting force of the spindle, and will break, forming iron rings or long strips of iron chips.

[0003] Due to the confined space inside the turbine housing and the high-speed rotation of the main shaft, iron rings or long iron filings are thrown into the flow channel and become stuck under centrifugal force. While air guns are typically used to blow away the filings, this method fails because the iron rings are relatively large and the space is limited, causing the filings to easily become trapped. Therefore, if the processing method remains unchanged, the generation of iron rings and long iron filings is unavoidable, leading to quality risks and customer complaints. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems of iron rings and long strip iron chips being generated and stuck in the flow channel during the turbine housing processing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides a method for preventing the stainless steel ring from getting stuck inside the flow channel of a dual-channel stainless steel volute, comprising:

[0006] Rough boring is performed on the stepped hole of the volute to be machined, and a predetermined length of allowance is reserved at the root of the stepped hole located on the upper end face of the flow channel.

[0007] The stepped hole is precision machined to remove the reserved allowance.

[0008] In one embodiment of the present invention, during the rough boring process, the cutting speed of the boring bar is 85-95 mm / min and the feed rate is 0.18-0.22 mm / revolution.

[0009] In one embodiment of the present invention, during the finish turning process, the cutting speed of the finish turning tool is 80-90 mm / min, and the feed rate is 0.18-0.22 mm / revolution.

[0010] In one embodiment of the present invention, the predetermined length is 2-3 mm.

[0011] In one embodiment of the present invention, before rough boring the stepped hole of the volute to be machined, the volute to be machined is clamped using a first tooling fixture, and the positioning surface on the volute to be machined is machined.

[0012] The volute to be processed includes a volute body and an intake housing extending from the volute body. The positioning surface includes an outlet end face, a positioning hole reference surface, an orientation reference surface, and a measurement pull direction surface located on the intake housing.

[0013] The first tooling fixture includes a first base plate and a fixture disposed on the first base plate:

[0014] The chuck includes a plurality of radially movable jaws arranged circumferentially, which can clamp the bottom inner hole of the vortex body when they are far apart from each other.

[0015] Multiple first support cylinders are used to abut against the upper sidewall of the volute body;

[0016] Multiple first bottom lever cylinders are used to support the bottom of the volute body and the intake housing;

[0017] An air intake housing positioning structure includes a first end face positioning cylinder and a positioning point cylinder. The first end face positioning cylinder can abut against the end face of the air intake housing. The positioning point cylinder includes a positioning block. The air intake port at the end face of the air intake housing is provided with a first positioning point and a second positioning point. The positioning block is provided with a first positioning head and a second positioning head that can respectively abut against the first positioning point and the second positioning point.

[0018] In one embodiment of the present invention, the first bottom lever cylinder includes a support base, a support rod hinged to the support base, and a drive cylinder for driving the support rod to rotate, wherein the support rod is capable of abutting against the bottom of the volute body or the air intake housing.

[0019] The first bottom lever cylinder is provided in three parts, two of which are arranged symmetrically along the radial direction of the chuck and are used to support the bottom of the volute body, and the remaining one is arranged next to the air intake housing positioning structure and is used to support the bottom of the air intake housing;

[0020] The support base is rotatably connected to a rotating shaft with its axis parallel to the plane of the base plate, and the end of the support rod is connected to the rotating shaft.

[0021] In one embodiment of the present invention, the air intake housing positioning structure includes a positioning seat, a first end face positioning cylinder and a positioning point cylinder are respectively installed on the positioning seat, and the first end face positioning cylinder is located directly above the positioning point cylinder.

[0022] In one embodiment of the present invention, a heightening plate is further included, on which a mounting base is installed. Two first support cylinders are provided, respectively disposed on the heightening plate and on the mounting base. An auxiliary support cylinder capable of abutting against the outer wall of the air intake housing is also installed on the mounting base.

[0023] In one embodiment of the present invention, rough boring of the stepped hole of the volute to be machined includes clamping the volute to be machined using a second tooling fixture;

[0024] The second tooling fixture includes a second base plate and a fixture disposed on the second base plate:

[0025] The first positioning core is used to position the inner hole of the vortex body;

[0026] A single second support cylinder is used to abut against the upper sidewall of the volute body;

[0027] Multiple second bottom lever cylinders are used to support the bottom of the volute body and the intake housing;

[0028] The second end-face positioning cylinder is located next to the second support cylinder and abuts against the end face of the air intake housing;

[0029] The first limiting seat abuts against the air intake housing to limit the direction of the air intake housing.

[0030] In one embodiment of the present invention, precision machining of the stepped hole includes clamping the volute to be machined using a third tooling fixture, wherein the third tooling fixture includes a third base plate and a fixture disposed on the third base plate:

[0031] The second positioning core is used to position the inner hole of the vortex body;

[0032] Multiple third support cylinders arranged around the volute body are used to abut against the upper sidewall of the volute body;

[0033] Multiple third bottom lever cylinders are used to support the bottom of the volute body and the intake housing;

[0034] The third end-face positioning cylinder abuts against the end face of the air intake housing;

[0035] The second limiting seat abuts against the air intake housing to limit the direction of the air intake housing.

[0036] The technical solution of the present invention has the following advantages compared with the prior art:

[0037] This invention discloses a method for preventing stainless steel rings from getting stuck in the flow channel of a dual-flow-channel stainless steel volute. This method effectively prevents iron rings and long iron filings from getting stuck in the flow channel during machining, thus avoiding complaints and unnecessary losses at the customer's expense. Rough boring and finish turning are performed in separate steps, and reasonable machining allowances are reserved, making the machining process more efficient and reducing rework and material waste.

[0038] The optimized settings of machining parameters such as cutting speed and feed rate in this invention improve machining efficiency while ensuring machining accuracy and surface quality.

[0039] The first, second, and third tooling fixtures of this invention are all designed with precise positioning mechanisms to ensure accurate positioning of the volute shell during each machining operation.

[0040] The processing method of this invention is applicable not only to dual-flow-channel stainless steel turbine housings, but also to other workpieces with complex flow-channel structures. This method is simple, easy to operate, and highly applicable, improving production efficiency and processing quality. Attached Figure Description

[0041] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0042] Figure 1 This is a schematic diagram of the structure of the dual-channel stainless steel vortex shell of the present invention.

[0043] Figure 2 yes Figure 1 A cross-sectional view along the AA direction.

[0044] Figure 3 This is a schematic diagram of the rough boring process of the present invention.

[0045] Figure 4 yes Figure 3 A magnified view of a portion of point S in the middle.

[0046] Figure 5 This is a schematic diagram of the precision machining process of the present invention.

[0047] Figure 6 yes Figure 5 A magnified view of a portion of point M in the middle.

[0048] Figure 7 This is a schematic diagram of the reference surface structure on one side of the vortex shell to be processed according to the present invention.

[0049] Figure 8 This is a schematic diagram of the reference surface structure on the other side of the vortex shell to be processed according to the present invention.

[0050] Figure 9This is a top view of the structure of the first tooling fixture of the present invention.

[0051] Figure 10 This is a schematic diagram of the axial structure of the first tooling fixture of the present invention.

[0052] Figure 11 This is a schematic diagram of the axial structure of the air intake housing positioning structure of the present invention.

[0053] Figure 12 This is a schematic diagram of the structure of the first tooling fixture of the present invention after clamping the vortex shell.

[0054] Figure 13 yes Figure 12 A cross-sectional view along the AA direction.

[0055] Figure 14 yes Figure 12 A cross-sectional view along the BB direction.

[0056] Figure 15 This is a schematic diagram of the axial structure of the second tooling fixture of the present invention.

[0057] Figure 16 yes Figure 15 A cross-sectional view along the AA direction.

[0058] Figure 17 This is a schematic diagram of the axial structure of the third tooling fixture of the present invention.

[0059] Figure 18 yes Figure 17 A cross-sectional view along the AA direction.

[0060] Explanation of reference numerals in the instruction manual:

[0061] 100. Volute housing to be processed; 110. Root of the upper end face of the flow channel; 120. First flow channel; 130. Second flow channel; 140. Volute housing body; 150. Inlet housing; 151. First positioning point; 152. Second positioning point; 160. Outlet end face; 170. Positioning hole reference surface; 180. Orientation reference surface; 190. Measuring pull direction surface; 191. Z-plane;

[0062] 1. First tooling fixture; 11. Chuck; 12. Jaw; 13. First support cylinder; 14. First bottom lever cylinder; 141. Support seat; 142. Support rod; 143. Drive cylinder; 15. First end face positioning cylinder; 16. Positioning point cylinder; 17. Positioning block; 171. First positioning head; 172. Second positioning head; 18. Positioning seat; 19. Extension plate; 191. Auxiliary support cylinder;

[0063] 2. Second tooling fixture; 21. First positioning core; 22. Second support cylinder; 23. Second bottom lever cylinder; 24. Second end face positioning cylinder; 25. First limit seat;

[0064] 3. Third tooling fixture; 31. Second positioning core; 32. Third support cylinder; 33. Third bottom lever cylinder; 34. Third end face positioning cylinder; 35. Second limit seat. Detailed Implementation

[0065] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0066] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0067] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0068] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0069] Reference Figures 1 to 6 As shown, a method for preventing a stainless steel ring from getting stuck inside the flow channel of a dual-channel stainless steel volute according to the present invention includes:

[0070] S1. The volute housing 100 to be processed is clamped using the first tooling fixture 1, and the positioning surface on the volute housing 100 to be processed is processed.

[0071] S2. The volute housing 100 to be processed is clamped using the second tooling fixture 2, and the stepped hole of the volute housing 100 to be processed is rough bored, and a predetermined length of allowance is reserved at the root 110 of the stepped hole located on the upper end face of the flow channel.

[0072] S3. Using the third tooling fixture 3 to clamp the volute 100 to be processed, perform precision machining on the stepped hole to remove the reserved allowance.

[0073] Because the root 110 of the upper end face of the flow channel is subjected to less force during precision machining, the generation of iron rings and long strip iron chips can be avoided.

[0074] In one embodiment, during the rough boring process, the cutting speed of the boring bar is 85-95 mm / min, the feed rate is 0.18-0.22 mm / revolution, and the entire rough boring path (dashed line portion) is referenced. Figure 4 As shown.

[0075] In one embodiment, during the finish turning process, the cutting speed of the finish turning tool is 80-90 mm / min, and the feed rate is 0.18-0.22 mm / rpm. The entire finish turning path (dashed line portion) is shown below. Figure 6 As shown.

[0076] In one embodiment, refer to Figure 4 As shown, the predetermined length is 2-3 mm.

[0077] In one embodiment, refer to Figure 7 , Figure 8 As shown, the volute housing 100 to be processed includes a volute housing body 140 and an intake housing 150 extending from the volute housing body 140, and also includes a first flow channel 120 and a second flow channel 130. The positioning surface includes an outlet end face 160 (positioning surface M reference) and a positioning hole reference face 170 (positioning hole N reference) located on the volute housing body 140, and an orientation reference face 180 (O reference) and a measuring pull direction face 190 located on the intake housing 150.

[0078] In one embodiment, refer to Figure 9 , Figure 10 As shown, the first tooling fixture 1 includes a first base plate and a fixture disposed on the first base plate:

[0079] The chuck 11 includes a plurality of radially movable jaws 12 arranged circumferentially, and the plurality of jaws 12 can clamp the bottom inner hole of the volute body 140 when they are far apart from each other.

[0080] Multiple first support cylinders 13 are used to abut against the upper sidewall of the volute body 140;

[0081] Multiple first bottom lever cylinders 14 are used to support the bottom of the volute body 140 and the intake housing 150;

[0082] The air intake housing positioning structure includes a first end face positioning cylinder 15 and a positioning point cylinder 16. The first end face positioning cylinder 15 can abut against the end face of the air intake housing 150. The positioning point cylinder 16 includes a positioning block 17. The air intake port at the end face of the air intake housing 150 is provided with a first positioning point 151 (volute G point) and a second positioning point 152 (volute Z3 point). The positioning block 17 is provided with a first positioning head 171 and a second positioning head 172 that can respectively abut against the first positioning point 151 and the second positioning point 152.

[0083] Specifically, the first bottom lever cylinder 14 includes a support base 141, a support rod 142 hinged to the support base 141, and a drive cylinder 143 for driving the support rod 142 to rotate. The support rod 142 can abut against the bottom of the volute body 140 or the air intake housing 150.

[0084] Specifically, three first bottom lever cylinders 14 are provided, two of which are radially symmetrically arranged along the chuck 11 and used to support the bottom of the vortex body 140, and the remaining one is arranged next to the air intake housing positioning structure and used to support the bottom of the air intake housing 150.

[0085] The support base 141 is rotatably connected to a rotating shaft with its axis parallel to the plane of the base plate, and the end of the support rod 142 is connected to the rotating shaft.

[0086] Specifically, refer to Figure 11 As shown, the air intake housing positioning structure includes a positioning seat 18, a first end face positioning cylinder 15 and a positioning point cylinder 16 respectively installed on the positioning seat 18, and the first end face positioning cylinder 15 is located directly above the positioning point cylinder 16.

[0087] Specifically, it also includes a heightening plate 19, on which a mounting base is installed. Two first support cylinders 13 are provided, respectively on the heightening plate 19 and the mounting base. An auxiliary support cylinder 191 that can abut against the outer wall of the air intake housing 150 is also installed on the mounting base.

[0088] By setting up the first fixture, the volute housing 100 to be processed can be kept flat and cannot rotate or move up and down during processing, thus preventing workpiece vibration and ensuring processing quality.

[0089] When clamping the workpiece, ensure that the first positioning head 171 and the second positioning head 172 are in close contact with the first positioning point 151 and the second positioning point 152 on the workpiece, respectively. The jaws 12 on the chuck 11 flatten the Z plane 191 of the workpiece. The air outlet end face 160, the positioning hole reference surface 170, the orientation reference surface 180 and the measuring pull direction surface 190 are machined for subsequent clamping, positioning and measurement.

[0090] In one embodiment, refer to Figure 15 , Figure 16 As shown, the second tooling fixture 2 includes a second base plate and a fixture disposed on the second base plate:

[0091] The first positioning core 21 is used to position the inner hole of the vortex body 140;

[0092] A single second support cylinder 22 is used to abut against the upper sidewall of the volute body 140;

[0093] Multiple second bottom lever cylinders 23 (with the same structure as the first bottom lever cylinder 14) are used to support the bottom of the volute body 140 and the intake housing 150;

[0094] The second end face positioning cylinder 24 is located beside the second support cylinder 22 and abuts against the end face of the air intake housing 150.

[0095] The first limiting seat 25 abuts against the air intake housing 150 to limit the direction of the air intake housing 150.

[0096] The volute housing 100 to be processed is installed on the first positioning core 21. After ensuring that the air outlet end face 160, the positioning hole reference surface 170, the orientation reference surface 180 and the tooling positioning reference are flat, rough machining is performed.

[0097] In one embodiment, refer to Figure 17 , Figure 18 As shown, the third tooling fixture 3 includes a third base plate and a fixture disposed on the third base plate:

[0098] The second positioning core 31 is used to position the inner hole of the vortex body 140;

[0099] Multiple third support cylinders 32 are arranged around the vortex body 140 to abut against the upper sidewall of the vortex body 140;

[0100] Multiple third bottom lever cylinders 33 (with the same structure as the first bottom lever cylinder 14) are used to support the bottom of the vortex body 140 and the intake housing 150;

[0101] The third end face positioning cylinder 34 abuts against the end face of the air intake housing 150;

[0102] The second limiting seat 35 abuts against the air intake housing 150 to limit the direction of the air intake housing 150.

[0103] The above processing method is applicable not only to dual-flow-channel stainless steel turbine housings, but also to other workpieces with complex flow-channel structures. This method is simple, easy to operate, and highly applicable, improving production efficiency and processing quality.

[0104] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A method for preventing a stainless steel ring from getting stuck inside the flow channel of a dual-channel stainless steel volute, characterized in that, include: Rough boring is performed on the stepped hole of the volute (100) to be machined, and a predetermined length of allowance is reserved at the root (110) of the stepped hole located on the upper end face of the flow channel. The stepped hole is precision machined to remove the reserved allowance; Before rough boring the stepped hole of the volute (100) to be machined, the volute (100) to be machined is clamped using the first tooling fixture (1), and the positioning surface on the volute (100) to be machined is machined. The volute to be processed (100) includes a volute body (140) and an intake housing (150) extending from the volute body (140). The positioning surface includes an outlet end face (160) on the volute body (140), a positioning hole reference surface (170), an orientation reference surface (180) on the intake housing (150), and a measuring pull direction surface (190). The first tooling fixture (1) includes a first base plate and a fixture disposed on the first base plate: The chuck (11) includes a plurality of radially movable jaws (12) arranged circumferentially, which can clamp the bottom inner hole of the vortex body (140) when they are far apart from each other; Multiple first support cylinders (13) are used to abut against the upper sidewall of the vortex body (140); Multiple first bottom lever cylinders (14) are used to support the bottom of the volute body (140) and the intake housing (150); The air intake housing positioning structure includes a first end face positioning cylinder (15) and a positioning point cylinder (16). The first end face positioning cylinder (15) can abut against the end face of the air intake housing (150). The positioning point cylinder (16) includes a positioning block (17). The air intake port at the end face of the air intake housing (150) is provided with a first positioning point (151) and a second positioning point (152). The positioning block (17) is provided with a first positioning head (171) and a second positioning head (172) that can abut against the first positioning point (151) and the second positioning point (152) respectively. Rough boring of the stepped hole of the volute (100) to be machined includes clamping the volute (100) to be machined using a second tooling fixture (2). The second tooling fixture (2) includes a second base plate and a fixture disposed on the second base plate: The first positioning core (21) is used to position the inner hole of the vortex body (140); A single second support cylinder (22) is used to abut against the upper sidewall of the vortex body (140); Multiple second bottom lever cylinders (23) are used to support the bottom of the volute body (140) and the intake housing (150); The second end face positioning cylinder (24) is located beside the second support cylinder (22) and abuts against the end face of the air intake housing (150); The first limiting seat (25) abuts against the air intake housing (150) to limit the direction of the air intake housing (150); The stepped hole is precision machined, including clamping the volute (100) to be machined using a third tooling fixture (3), wherein the third tooling fixture (3) includes a third base plate and a fixture disposed on the third base plate: The second positioning core (31) is used to position the inner hole of the vortex body (140); Multiple third support cylinders (32) arranged around the vortex body (140) are used to abut against the upper sidewall of the vortex body (140); Multiple third bottom lever cylinders (33) are used to support the bottom of the volute body (140) and the intake housing (150); The third end face positioning cylinder (34) abuts against the end face of the air intake housing (150); The second limiting seat (35) abuts against the air intake housing (150) to limit the direction of the air intake housing (150).

2. The method for preventing the stainless steel ring from getting stuck inside the flow channel of a dual-channel stainless steel volute according to claim 1, characterized in that, During the rough boring process, the cutting speed of the boring bar is 85-95 mm / min, and the feed rate is 0.18-0.22 mm / revolution.

3. The method for preventing the stainless steel ring from getting stuck inside the flow channel of a dual-channel stainless steel volute according to claim 1, characterized in that, During the finishing process, the cutting speed of the finishing tool is 80-90 mm / min, and the feed rate is 0.18-0.22 mm / revolution.

4. The method for preventing the stainless steel ring from getting stuck inside the flow channel of a dual-channel stainless steel volute according to claim 1, characterized in that, The predetermined length is 2-3 mm.

5. The method for preventing the stainless steel ring from getting stuck inside the flow channel of a dual-channel stainless steel volute according to claim 1, characterized in that, The first bottom lever cylinder (14) includes a support base (141), a support rod (142) hinged to the support base (141), and a drive cylinder (143) for driving the support rod (142) to rotate. The support rod (142) can abut against the bottom of the vortex body (140) or the air intake housing (150). The first bottom lever cylinder (14) is provided in three parts, two of which are arranged radially symmetrically along the chuck (11) and used to support the bottom of the vortex body (140), and the remaining one is arranged on the side of the air intake housing positioning structure and used to support the bottom of the air intake housing (150); The support base (141) is rotatably connected to a rotating shaft with an axis parallel to the plane of the base plate, and the end of the support rod (142) is connected to the rotating shaft.

6. The method for preventing the stainless steel ring from getting stuck inside the flow channel of a dual-channel stainless steel volute according to claim 1, characterized in that, The air intake housing positioning structure includes a positioning seat (18), a first end face positioning cylinder (15) and a positioning point cylinder (16) respectively installed on the positioning seat (18), and the first end face positioning cylinder (15) is located directly above the positioning point cylinder (16).

7. The method for preventing the stainless steel ring from getting stuck inside the flow channel of a dual-channel stainless steel volute according to claim 1, characterized in that, It also includes a heightening plate (19), on which a mounting base is installed. Two first support cylinders (13) are provided, respectively on the heightening plate (19) and the mounting base. An auxiliary support cylinder (191) that can abut against the outer wall of the air intake housing (150) is also installed on the mounting base.

Images