A method for processing a U-shaped groove of a connected exhaust pipe

Abstract

The present application relates to a kind of processing method of U-shaped groove of connected exhaust pipe.The present application is applied to the processing of U-shaped groove on the flange of connected exhaust pipe, the connected exhaust pipe includes flange, flow channel and pipe body, the flange includes oppositely arranged flange plane and flange back, the method includes: positioning and clamping connected exhaust pipe;Prepare milling cutter tool, the overhang of the milling cutter tool is 25mm, the diameter of the cutting edge of the milling cutter tool is 11mm, the cutting edge end of the milling cutter tool is circumferentially provided with the fillet with the radius of 3mm, the milling cutter tool is 32 ° with the flange plane Angle, five U-shaped grooves are machined in the flange side end by linear milling.The present application changes the tool by designing and changing the tool direction of the machining part, so as to solve the problem of vibration tool when machining U-shaped groove, also ensure the stability of U-shaped groove size, improve the life of tool, and improve the efficiency of processing.

Description

Technical Field

[0001] This invention relates to the field of integrated exhaust pipe processing technology, and in particular to a method for processing a U-shaped groove in an integrated exhaust pipe. Background Technology

[0002] Due to the inherent structure of the B48 integrated exhaust pipe component, machining the five U-shaped grooves on the exhaust pipe from a vertical angle from the back side presents the following problems: the tool diameter is limited by the 3.0mm radius of the U-shaped groove fillet, allowing only a 6.0mm diameter end mill to be used; during machining, the tool must be extended 50mm above the pipe wall to avoid interference; the excessive tool extension results in insufficient tool rigidity, leading to vibration and tool deflection; the U-shaped groove dimensions are unstable, causing vibration marks on the surface; tool life is not ideal, making breakage likely; and machining the U-shaped grooves is time-consuming. Summary of the Invention

[0003] To address this issue, the present invention provides a method for machining a U-shaped groove in an integrated exhaust pipe. By modifying the design of the cutting tool and changing the tool's downward cutting direction, the problem of tool vibration during U-shaped groove machining is solved. This method also ensures the stability of the U-shaped groove dimensions, improves tool life, and increases machining efficiency.

[0004] To solve the above-mentioned technical problems, the present invention provides a method for machining a U-shaped groove in a one-piece exhaust pipe, applicable to the machining of a U-shaped groove on a flange of a one-piece exhaust pipe. The one-piece exhaust pipe includes a flange, a flow channel, and a pipe body. The flange includes a flange plane and a flange back side disposed opposite to each other. The method includes:

[0005] Position and clamp the integrated exhaust pipe;

[0006] Prepare a milling cutter with a cantilever length of 25mm, a cutting edge diameter of 11mm, and a circumferential radius of 3mm at the cutting edge. Place the milling cutter at a 32° angle to the flange plane and perform straight milling to machine five U-shaped grooves on the side of the flange.

[0007] In one embodiment of the present invention, the milling cutter material is high-speed steel, cemented carbide, or ceramic.

[0008] In one embodiment of the present invention, the milling speed of the milling cutter is 30-50 m / min, the feed rate is 80-100 mm / min, and the depth of cut is 15-17 mm.

[0009] In one embodiment of the present invention, after processing, the dimensions of the U-shaped groove are checked using calipers and height gauges, and the surface roughness and flatness of the U-shaped groove surface are measured using a surface roughness meter.

[0010] In one embodiment of the present invention, a positioning fixture is further included. The positioning fixture includes a base, a support plate connected to the base, and a support frame connected to the base. The flange plane of the integrated exhaust pipe abuts against the support plate. The base is provided with a clamping assembly and a first limiting assembly, and the support frame is provided with a second limiting assembly.

[0011] In one embodiment of the present invention, the first clamping assembly includes two clamping cylinders connected to the base, the two clamping cylinders respectively clamping the back of the flange of the integrated exhaust pipe, and the first limiting assembly includes a first connecting block connected to the base, the first connecting block being connected to a first limiting post located on one side of the flange and a second limiting post located on one side of the outer wall of the flow channel.

[0012] In one embodiment of the present invention, the second limiting component includes a second connecting block connected to the support frame, one end of the second connecting block is connected to a limiting head that abuts against the outer wall of the flow channel, and the other end is connected to a third limiting post that abuts against the end of the tube body.

[0013] In one embodiment of the present invention, the second connecting block is further connected to an arc-shaped block that extends into the interior of the tube and abuts against the inner wall of the tube.

[0014] In one embodiment of the present invention, the support plate is provided with U-shaped notches corresponding to the positions of the U-shaped grooves, the base is provided with a mounting block corresponding to the position of the U-shaped notches, the mounting block is rotatably connected to a rotating arm, the end of the rotating arm is provided with a support head, and the support head can abut against the air port sidewall on the flange plane when the rotating arm rotates.

[0015] In one embodiment of the present invention, the base is provided with clearance grooves corresponding to the position of the U-shaped groove, for clearance of the milling cutter.

[0016] The above-described technical solution of the present invention has the following advantages:

[0017] The present invention discloses a method for machining a U-shaped groove for an integrated exhaust pipe, which improves the tool diameter by increasing the tool diameter from 6.0 mm to 11.0 mm, thereby thickening the tool shank and enhancing the rigidity and strength of the tool.

[0018] The present invention changes the fillet radius of the tool to 3.0mm, which meets the size requirements of the U-shaped groove fillet on the drawing.

[0019] This invention changes the downward direction of the cutting tool to process the U-shaped groove vertically, reducing the tool overhang length from the original 50mm (8-9 times the diameter) to 25mm (2 times the diameter). Furthermore, the milling cutter, which was originally 6.0mm in diameter for processing the U-shaped groove, is now directly changed to a 11.0mm diameter milling cutter for straight milling according to the part drawing, thus increasing efficiency by 2 times.

[0020] By changing the cutting direction of the tool, the cutting force direction is aligned with the contact direction between the workpiece surface and the fixture positioning surface, which is more beneficial to actual machining conditions. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a schematic diagram of the overall structure of the integrated exhaust pipe of the present invention.

[0023] Figure 2 This is a schematic diagram of the integrated exhaust pipe structure of the present invention.

[0024] Figure 3 This is a schematic diagram of one side of the positioning fixture of the present invention.

[0025] Figure 4 This is a schematic diagram of the other side of the positioning fixture of the present invention.

[0026] Figure 5 This is a schematic diagram of the angle between the milling cutter and the flange plane of the present invention.

[0027] Figure 6 This is a schematic diagram of the machining process of the integrated exhaust pipe U-shaped groove of the present invention.

[0028] Figure 7 This is a schematic diagram of the milling cutter structure of the present invention.

[0029] Figure 8 This is a schematic diagram of the U-shaped groove processing of an integrated exhaust pipe, which is another processing method.

[0030] Figure 9 This is a schematic diagram of an existing milling cutter structure for another machining method.

[0031] Explanation of reference numerals on the accompanying drawings:

[0032] 1. Integrated exhaust pipe; 12. Flange; 12a. Flange face; 12b. Flange back; 121. U-shaped groove; 122. Air port; 13. Flow channel; 14. Pipe body;

[0033] 2. Milling cutter; 21. Tool holder; 22. Cutting edge;

[0034] 3. Positioning clamp; 31. Base; 311. Clearance groove; 32. Support plate; 321. U-shaped notch; 33. Support frame; 34. Clamping assembly; 341. Clamping cylinder; 35. First limiting assembly; 351. First connecting block; 352. First limiting post; 353. Second limiting post; 36. Second limiting assembly; 361. Second connecting block; 362. Limiting head; 363. Third limiting post; 364. Arc block; 37. Mounting block; 38. Rotating arm; 381. Support head. Detailed Implementation

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] Reference Figures 1 to 7 As shown, the present invention discloses a method for machining a U-shaped groove in a one-piece exhaust pipe, applied to machining a U-shaped groove 121 on a flange 12 of a one-piece exhaust pipe 1. The one-piece exhaust pipe 1 includes a flange 12, a flow channel 13, and a pipe body 14. The flange 12 includes a flange plane 12a and a flange back surface 12b disposed opposite to each other. The one-piece exhaust pipe 1 is specifically a B48 one-piece exhaust pipe. The method includes:

[0040] S1. Before starting processing, the surface of the integrated exhaust pipe 1 needs to be cleaned and inspected to ensure that there are no obvious defects and dirt. It can be cleaned with a brush, compressed air or cleaning agent.

[0041] S2. Position and clamp the integrated exhaust pipe 1 using the positioning clamp 3. A three-jaw self-centering chuck, vacuum suction cup clamp, or similar clamping device can be used for clamping.

[0042] In some embodiments, refer to Figure 4 and Figure 5 As shown, the positioning fixture 3 includes a base 31, a support plate 32 connected to the base 31, and a support frame 33 connected to the base 31. The flange plane 12a of the integrated exhaust pipe 1 abuts against the support plate 32. The base 31 is provided with a clamping assembly 34 and a first limiting assembly 35. The support frame 33 is provided with a second limiting assembly 36. The first clamping assembly 34 includes two clamping cylinders 341 connected to the base 31. The two clamping cylinders 341 clamp the flange back 12b of the integrated exhaust pipe 1. The first limiting assembly 35 includes a first connecting block 351 connected to the base 31. The first connecting block 351 is connected to a first limiting post 352 located on one side of the flange 12 and a second limiting post 353 located on one side of the outer wall of the flow channel 13. The second limiting assembly 36 includes a first limiting post 352 connected to the support frame 33. The second connecting block 361 has a limiting head 362 connected to one side end, which abuts against the outer wall of the flow channel 13, and a third limiting post 363 connected to the other side end, which abuts against the end of the tube body 14. The second connecting block 361 is also connected to an arc-shaped block 364 that extends into the tube body 14 and abuts against the inner wall of the tube body 14. The support plate 32 has U-shaped notches 321 corresponding to the position of the U-shaped groove 121. The base 31 is provided with a mounting block 37 corresponding to the position of the U-shaped notch 321. The mounting block 37 is rotatably connected to a rotating arm 38. The end of the rotating arm 38 is provided with a support head 381. The support head 381 can abut against the side wall of the air port 122 on the flange plane 12a when the rotating arm 38 rotates. The base 31 is provided with clearance grooves 311 corresponding to the position of the U-shaped groove 121 for clearance of the milling cutter 2. The above settings ensure that the integrated exhaust pipe 1 will not be deformed or damaged during the clamping process, and avoid excessive clamping force that could cause the exhaust pipe to deform.

[0043] S3. Prepare a milling cutter 2. The overhang of the milling cutter 2 is 25mm. The diameter of the cutting edge 22 of the milling cutter 2 is 11mm. The end of the cutting edge 22 of the milling cutter 2 has a radius of 3mm in the circumferential direction. The milling cutter 2 is placed at a 32° angle with the flange plane 12a. The material of the cutter can be high-speed steel, cemented carbide or ceramic, etc., to meet the requirements of processing hardness and wear resistance.

[0044] S4. Set the milling parameters: the milling speed of the milling cutter 2 is 30-50 m / min, the feed rate is 80-100 mm / min, and the depth of cut is 15-17 mm. Five U-shaped grooves 121 are machined on the side end of the flange 12 through straight-line milling. During the milling process, a layered, step-by-step machining method can be adopted to gradually achieve the required dimensions of the U-shaped grooves 121. During the machining process, cutting fluid is used for cooling and lubrication to reduce cutting temperature, minimize tool wear, and improve the surface finish. Water-soluble cutting fluid or oil-based cutting fluid can be selected.

[0045] S5. After machining, inspect and measure the U-shaped groove 121 to ensure that the dimensional accuracy and surface quality meet the requirements. Dimensions of the U-shaped groove 121 can be measured using plug gauges, calipers, vernier calipers, etc., and the surface roughness and flatness of the U-shaped groove 121 can be measured using a surface roughness tester.

[0046] like Figure 8 , Figure 9 The diagram shows another method for machining the U-shaped groove 121 of the integrated exhaust pipe 1. The cutting is performed vertically from the back, and only a 6.0mm diameter milling cutter can be used. Due to the structure of the B48 integrated exhaust pipe 1 part, the cutting tool needs to be exposed by 50mm during machining. This excessively long tool overhang leads to insufficient tool rigidity, resulting in vibration and tool deflection. The dimensions of the U-shaped groove 121 are unstable, and vibration marks appear on the surface. The tool life is not ideal, and breakage is likely. Machining the U-shaped groove 121 is also time-consuming. However, the present invention, through the above method, has the following advantages:

[0047] Improved tool diameter: The tool diameter was changed from the existing 6.0mm to 11.0mm, thereby enhancing the rigidity and strength of the tool.

[0048] Improved tool fillet: The fillet diameter of the tool was set to 3.0mm to meet the dimensional requirements of the U-groove 121 fillet.

[0049] Improved tool down-cutting direction: By changing the tool down-cutting direction and adopting the U-shaped groove 121 vertical machining method, the tool overhang length is shortened from the original 50mm to 25mm, and a 11.0mm diameter milling cutter is used for straight milling, thereby greatly improving machining efficiency.

[0050] Improved cutting force direction of the tool: By changing the downward direction of the tool, the cutting force direction of the tool is aligned with the contact direction of the workpiece surface and the positioning surface of the fixture, which is beneficial to the actual machining conditions.

[0051] The above improvements can enhance tool rigidity, resolve the vibration problem during U-groove 121 machining, ensure dimensional stability of U-groove 121, improve tool life, and significantly increase machining efficiency.

[0052] 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 processing a U-shaped groove of a flange of a continuous exhaust pipe, the method being applied to processing of a U-shaped groove (121) of a flange (12) of a continuous exhaust pipe (1), the continuous exhaust pipe (1) comprising the flange (12), a flow channel (13) and a pipe body (14), the flange (12) comprising a flange plane (12a) and a flange back surface (12b) oppositely arranged, characterized in that, The method comprises: Position and clamp the connected exhaust pipe (1); Prepare a milling cutter (2), the overhang of the milling cutter (2) is 25mm, the diameter of the blade (22) of the milling cutter (2) is 11mm, the blade (22) of the milling cutter (2) has a fillet with a radius of 3mm at the end, the milling cutter (2) is clamped at an angle of 32° with the flange plane (12a), and five U-shaped grooves (121) are processed on the side end of the flange (12) by linear milling. Further comprising a positioning clamp (3), the positioning clamp (3) comprises a base (31), a support plate (32) connected to the base (31), and a support frame (33) connected to the base (31), the flange plane (12a) of the connected exhaust pipe (1) abuts against the support plate (32), the base (31) is provided with a clamping assembly (34) and a first limiting assembly (35), and the support frame (33) is provided with a second limiting assembly (36). The clamping assembly (34) comprises two clamping cylinders (341) connected to the base (31), the two clamping cylinders (341) are clamped at the back of the flange (12b) of the connected exhaust pipe (1) respectively, the first limiting assembly (35) comprises a first connecting block (351) connected to the base (31), the first connecting block (351) is connected with a first limiting column (352) located on one side of the flange (12) and a second limiting column (353) located on one side of the outer side wall of the flow channel (13). The second limiting assembly (36) comprises a second connecting block (361) connected to the support frame (33), one end of the second connecting block (361) is connected with a limiting head (362) abutting against the outer side wall of the flow channel (13), and the other end is connected with a third limiting column (363) abutting against the end of the pipe body (14). The second connecting block (361) is further connected with an arc block (364) extending into the inside of the pipe body (14) and abutting against the inner wall of the pipe body (14). The support plate (32) is provided with a U-shaped notch (321) corresponding to the position of the U-shaped groove (121), the base (31) is provided with a mounting block (37) corresponding to the position of the U-shaped notch (321), the mounting block (37) is rotationally connected with a rotating arm (38), the end of the rotating arm (38) is provided with a supporting head (381), and the supporting head (381) can abut against the sidewall of the air port (122) on the flange plane (12a) when the rotating arm (38) rotates.

2. The method of claim 1, wherein The material of the milling cutter (2) is high-speed steel, hard alloy or ceramic.

3. The method of claim 1, wherein the method further comprises: The milling speed of the milling cutter (2) is 30-50m / min, the feed speed is 80-100mm / min, and the cutting depth is 15-17mm.

4. The method of claim 1, wherein After processing, use a caliper and a height gauge to detect the size of the U-shaped groove (121), and use a surface roughness meter to measure the roughness and flatness of the surface of the U-shaped groove (121).

5. The method of claim 1, wherein the method further comprises: The base (31) is distributed with a position corresponding to the U-shaped groove (121) to give way to the slot (311) for the milling cutter (2) to give way.

Images