A fixture for welding and finishing of elbow conduit and a method for processing the elbow conduit

Abstract

The present invention discloses a fixture for welding and finishing of elbow conduits, which includes a base, a positioning sleeve, and a support. The base is disc-shaped, and a groove is provided in the middle of its upper end face. The lower part of the support is arranged in the groove and fixedly connected to the base. The positioning sleeve is placed on the support, and the notch in the lower part of the positioning sleeve and the notch in the upper part of the support are in the same direction. When the workpiece is undergoing a welding process, the position between the upper and lower parts and components to be welded can be determined by the positioning sleeve and the support, thereby ensuring the quality of welding. When the workpiece is undergoing a finishing process, the positioning sleeve is removed, and the workpiece only needs to be positioned by the support, and then the workpiece can be finish-turned. Therefore, the fixture of the present invention can be used in both the welding and finishing processes of the elbow conduit, thereby reducing production costs. The present invention also discloses a processing method for the elbow conduit, which improves the utilization rate of the connecting pipe material, facilitates clamping during semi-finishing, and improves processing efficiency.

Description

Technical Field

[0001] The invention relates to the field of mechanical manufacturing, in particular to a fixture for an elbow conduit and a processing method thereof. Background Art

[0002] In the field of pressure fluid (or gas) transmission, some occasions are often used due to space limitations. Figure 1 、 Figure 2 The elbow conduit shown is welded together by a rectangular seat 11, an annular seat 12 and three connecting pipes with inclined surfaces (connecting pipe I 131, connecting pipe II 132, connecting pipe III 133).

[0003] The existing processing method for elbow conduits is to cut the three beveled pipes I 131, II 132, and III 133 separately. After rough machining, the annular seat 12 is first welded to pipe II 132, and the rectangular seat 11 is welded to pipe I 131. These two components are semi-finished and then fully welded to pipe III 133, and finally finished to the drawing requirements. The disadvantages of this processing method are: 1. Because the three beveled pipes are cut separately, the pipe material utilization rate is low; 2. Semi-finishing the components is inconvenient to clamp; 3. The final welding requires a dedicated welding fixture, and the finishing also requires a dedicated fixture, which increases production costs. In short, the existing processing method for elbow conduits is cumbersome and inconvenient, with low processing efficiency and high manufacturing costs. Summary of the Invention

[0004] The present invention aims to provide a fixture for welding and finishing elbow conduits. This fixture can be used in both welding and finishing processes, thereby reducing production costs. Furthermore, the present invention provides a method for machining elbow conduits, which improves pipe material utilization, facilitates clamping during semi-finishing, and utilizes the same fixture for two different processes, thereby enhancing machining efficiency.

[0005] The present invention discloses a fixture for welding and finishing an elbow conduit, comprising a base, a positioning sleeve, and a support. The base is disc-shaped, with a groove provided in the middle of its upper end surface. The lower portion of the support is arranged in the groove and fixedly connected to the base. The positioning sleeve is placed on the support, and the notch in the lower portion of the positioning sleeve and the notch in the upper portion of the support are in the same direction.

[0006] Furthermore, the support is divided into three sections: a lower connecting part, a middle supporting part, and an upper positioning part. The upper and lower ends of the supporting part are fixed to the positioning part and the connecting part respectively; the connecting part is a rectangular base, and the rectangular base is arranged in the groove of the base. The positioning part includes a large circular ring at the bottom and a small circular ring at the top. Both the large and small circular rings are provided with cuts. The large circular ring is provided with three screw holes along the circumferential direction, and a screw is provided in each screw hole.

[0007] Furthermore, the rectangular base of the connecting part is positioned with its bottom and side surfaces, placed in the groove on the upper end surface of the base, and fastened to the base by bolts; the lower part of the inner hole of the positioning sleeve is sleeved on the outer ring surface of the small circular ring of the positioning part, and the lower end surface of the inner hole contacts the upper end surface of the large circular ring of the positioning part.

[0008] Furthermore, the supporting portion is a plurality of reinforcing ribs.

[0009] The processing method of the elbow catheter of the present invention comprises the following specific steps:

[0010] ① Material preparation: prepare the rectangular seat, the circular seat, and the three connecting pipes in the middle as a whole, and leave a processing allowance;

[0011] ② Rough machining: rough machining of rectangular seat, rough machining of circular seat, and machining of the overall length of the pipe to H;

[0012] ③Assembly welding: weld the rectangular seat, integral pipe and circular seat into one piece as required;

[0013] ④ Semi-finishing: Finish the rectangular seat in place and leave machining allowance on each side of the ring seat;

[0014] ⑤ Wire cutting: Cut the semi-finished workpiece into three sections as required: a rectangular seat section with a pipe I, a circular seat section with a pipe II, and a pipe III;

[0015] ⑥ Welding of the rectangular seat segment and pipe III: I. Spot welding: Align the elliptical surface after line cutting, and evenly spot weld the rectangular seat segment and pipe III at several locations to ensure accurate positioning of the two; II. Argon arc welding: Weld the rectangular seat segment and pipe III together to form an assembly;

[0016] ⑦ Welding of the component and the ring seat segment: I. Spot welding: Use a fixture to position and press the component and the ring seat segment, align the elliptical surfaces of the two, and evenly spot weld several places to ensure accurate positioning; II. Argon arc welding: Weld the component and the ring seat segment into a whole;

[0017] ⑧Fine turning: Use a fixture to position and clamp the welded workpiece as a whole, and fine turn the ring seat to the requirements of the drawing.

[0018] Furthermore, in step ②: the total length of the integral pipe after finishing is H: +2b / sina; among them, a, h1, h2, h, B, a are the relevant dimensions of the elbow conduit parts: a is the angle between the bevel of pipe I and the pipe wall / the angle between the bevel of pipe II and the pipe wall; h1 is the distance between the centers of the bevel and the plane of pipe I, h2 is the distance between the centers of the bevel and the plane of pipe II; h is the vertical distance between the centers of the bevel of pipe I and the bevel of pipe II; B is the horizontal distance between the centers of the bevel of pipe I and the bevel of pipe II; among them, b is the kerf spacing of wire cutting, which is generally 0.2mm.

[0019] Furthermore, in step ④ semi-finishing: use four jaws to clamp the four sides of the rectangular seat, turn the outer circle of the circular ring seat, the sealing end face, the outer circle of the step and the step surface, and leave processing allowance on each surface; turn the outer circle of the circular ring seat, and turn the annular sealing groove and the bottom surface of the rectangular seat to the requirements of the drawing; then mill and drill the four sides of the rectangular seat and the connecting screw holes.

[0020] Furthermore, in the argon arc welding in step ⑥ and step ⑦: the inclined surface of each section of the pipe is provided with an elliptical circumferential weld without a groove, and the inner and outer welds are both welded by argon arc welding.

[0021] Furthermore, in step ⑦: I spot welding: first place the rectangular seat in the assembly formed by welding the rectangular seat segment and the connecting pipe III in the groove on the upper end surface of the base and fasten it to the base with two bolts, then place the annular seat segment in the positioning sleeve, and then put the positioning sleeve on the small circular ring of the support positioning part, so that the elliptical surfaces of the assembly and the annular seat segment are aligned, and then spot weld them evenly in several places to ensure accurate positioning; II argon arc welding: remove the positioning sleeve, remove the two bolts, take out the workpiece and perform argon arc welding to weld the assembly and the annular seat segment into a whole.

[0022] Further, in step ⑧, first align the fixture and secure it to the lathe spindle. Then, fasten the rectangular seat in the workpiece to the base with four bolts. Then, gently tighten the three screws in sequence to compress the workpiece. Finally, finish lathe the outer diameter of the ring seat, the sealing end face, the stepped surface, and other parts to meet the drawing requirements. Once finish lathe operation is complete, loosen the three screws and remove the four bolts to easily remove the workpiece.

[0023] The advantages of the clamp for welding and fine turning of elbow catheters of the present invention are: when the workpiece is undergoing a welding process, the positions of the upper and lower parts and components to be welded can be determined by the positioning sleeve and the support, thereby ensuring the quality of welding; when the workpiece is undergoing a fine turning process, the positioning sleeve is removed, and the workpiece only needs to be positioned by the support, and then the workpiece can be fine turned; therefore, the clamp of the present invention can be used in both the welding and fine turning processes of the elbow catheter, thereby reducing production costs.

[0024] The advantages of the processing method of the elbow conduit of the present invention are: 1. Compared with the pipe blank in the background art, the pipe blank saves at least ΔH=2*d / tga, requires less material, and has a high material utilization rate; 2. During semi-finishing, since the rectangular seat, the circular seat, and the pipe are integrated into a whole, they are easy to clamp, thereby ensuring the processing quality; 3. The spot welding in step 7 and the finishing turning in step 8 use the same fixture, thereby reducing production costs.

[0025] In summary, the processing method of the present invention simplifies the processing technology, improves the utilization rate of the connecting pipe material, facilitates clamping during semi-finishing, and the fixtures used for welding and finishing are universal, simple in structure, and easy to use. It has the advantages of low manufacturing cost, high processing efficiency, and reliable quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a front view of the elbow conduit processed by the present invention;

[0027] Figure 2 for Figure 1 A top view of

[0028] Figure 3 This is a schematic diagram of the cutting process of the elbow conduit line of the present invention;

[0029] Figure 4 Schematic diagram of the fixture of the present invention (during spot welding in step ⑦);

[0030] Figure 5 For the Figure 4 Cross-sectional view along line AA;

[0031] Figure 6 Schematic diagram of the fixture of the present invention (during fine turning);

[0032] Figure 7 For the Figure 6 Cross-sectional view along the midline BB;

[0033] Figure 8 is a schematic diagram of a support in the clamp of the present invention;

[0034] Figure 9 for Figure 8 Top view of . DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below by way of examples with reference to the accompanying drawings:

[0036] Example 1

[0037] like Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 As shown, the present invention is a fixture for welding and finishing elbow conduits, which includes a base 6, a positioning sleeve 3, and a support 5; the base 6 is disc-shaped, and a groove is opened in the middle of its upper end surface. The lower part of the support 5 is arranged in the groove and fixedly connected to the base 6, and the positioning sleeve 3 is placed on the support 5. The notch at the lower part of the positioning sleeve 3 and the notch at the upper part of the support 5 are in the same direction.

[0038] The lower part of the positioning sleeve 3 and the upper part of the support 5 are provided with notches in the same direction to avoid interference between the components formed by welding the rectangular seat section and the pipe III and the fixture, thereby making it convenient to put in or take out the components; at the same time, it can also ensure the progress of welding.

[0039] When the workpiece is undergoing the welding process, the positioning sleeve 3 and the support 5 can determine the positions of the upper and lower parts and components to be welded, thereby ensuring the quality of welding; when the workpiece is undergoing the fine turning process, the positioning sleeve 3 is removed, and the workpiece only needs to be positioned by the support 5 to perform fine turning.

[0040] Example 2

[0041] like Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 As shown, in the clamp of the present invention: the support 5 is divided into three sections, namely the lower connecting portion 51, the middle supporting portion 52, and the upper positioning portion 53. The upper and lower ends of the supporting portion 52 are fixedly connected to the positioning portion 53 and the connecting portion 51 respectively; the connecting portion 51 is a rectangular base, and the rectangular base is arranged in the groove of the base 6. The positioning portion 53 includes a large circular ring at the bottom and a small circular ring at the top. Both the large and small circular rings are provided with cuts. The large circular ring is provided with three screw holes along the circumferential direction, and a screw 4 is provided in each screw hole.

[0042] The notch provided in the positioning portion 53 ensures that the components can be easily placed in or taken out, and also ensures that welding can be performed; when the fine turning process is performed, the screw 4 presses the workpiece to play an auxiliary supporting role.

[0043] Example 3

[0044] like Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 As shown, in the clamp of the present invention: the rectangular base of the connecting part 51 is positioned with its bottom and side surfaces, placed in the groove on the upper end surface of the base 6, and fastened to the base 6 by bolts 7; the lower part of the inner hole of the positioning sleeve 3 is sleeved on the outer ring surface of the small circular ring of the positioning part 53, and the lower end surface of the inner hole is in contact with the upper end surface of the large circular ring of the positioning part 53.

[0045] The support 5 is reliably connected to the base 6 through the connecting portion 51; the positioning sleeve 3 is positioned with the support 5 through the cooperation between the inner hole and the lower end surface and the positioning portion 53, thereby ensuring the relative position of the inclined tube and the assembly during welding.

[0046] Example 4

[0047] like Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 As shown, in the clamp of the present invention: the supporting portion 52 is a plurality of reinforcing ribs.

[0048] The reinforcing ribs not only reduce the overall weight of the fixture, but also avoid interference with the workpiece, making it easier to take and place the workpiece.

[0049] Example 5

[0050] The present invention provides a method for processing an elbow catheter, and the specific steps are:

[0051] ① Material preparation: prepare the rectangular seat 11, prepare the circular seat 12, and cut the three connecting pipes in the middle as a whole 13, leaving a processing allowance;

[0052] ② Rough machining: rough machining the rectangular seat 11, rough machining the circular seat 12, and machining the overall connecting pipe 13 to the total length H;

[0053] ③ Assembly welding: Assemble and weld the rectangular seat 11, the integral pipe 13, and the circular seat 12 into one piece as required;

[0054] ④ Semi-finishing: Finish the rectangular seat 11 in place and leave machining allowance on each side of the circular seat 12;

[0055] ⑤ Wire cutting: Cut the semi-finished workpiece into three sections as required: a rectangular seat section 21 with a pipe connection I 131, a circular seat section 22 with a pipe connection II 132, and a pipe connection III 133; (e.g. Figure 3 shown)

[0056] ⑥ Welding of the rectangular seat segment and the pipe III: I. Spot welding: Align the elliptical surface after line cutting and spot weld the rectangular seat segment 21 and the pipe III 133 evenly at several locations to ensure accurate positioning of the two; II. Argon arc welding: Weld the rectangular seat segment 21 and the pipe III 133 together to form an assembly 23;

[0057] ⑦ Welding of the assembly and the annular seat segment: I. Spot welding: Use a fixture to position and press the assembly 23 and the annular seat segment 22. After the elliptical surfaces of the two are aligned, spot weld them evenly at several locations to ensure accurate positioning; II. Argon arc welding: Weld the assembly 23 and the annular seat segment 22 into a whole;

[0058] ⑧Fine turning: Use the fixture to position and press the welded workpiece as a whole, and fine turn the ring seat 12 to the requirements of the drawing.

[0059] Example 6

[0060] The processing method of the present invention: In step ②: the total length of the integral pipe 13 after finishing is H: Among them, a, h1, h2, h, B, and a are all related dimensions of the elbow conduit parts: a is the angle between the bevel of pipe I131 and the pipe wall / the angle between the bevel of pipe II132 and the pipe wall; h1 is the distance between the centers of the bevel and the plane of pipe I131, and h2 is the distance between the centers of the bevel and the plane of pipe II132; h is the vertical distance between the centers of the bevel of pipe I131 and the centers of the bevel of pipe II132; B is the horizontal distance between the centers of the bevel of pipe I131 and the centers of the bevel of pipe II132; and b is the kerf spacing of wire cutting, which is generally 0.2mm.

[0061] Take the specific dimensions of the elbow guide d = 168, h1 = 120, h2 = 92, B = 124, h = 117, a = 64° as an example:

[0062] The process of the present invention: taking over the blank only requires

[0063] The existing processing method mentioned in the background technology is: three pipes with bevels are cut separately, and the blanks of the pipes need to be Where d is the outer diameter of the connecting pipe.

[0064] As can be seen from the above, the pipe blank of the present invention saves at least ΔH = 2*d / tga compared to the pipe blank of the background art. From the specific data, it can be seen that the stainless steel pipe is saved by about 30%. Therefore, the pipe blank of the present invention requires less material and has a high material utilization rate.

[0065] Example 7

[0066] In step ③, during group welding: the girth weld during group welding can be made by gas shielded welding or other welding methods.

[0067] Step 4: Semi-finishing: Clamp the four sides of the rectangular seat 11 with four jaws, turn the outer circle, sealing end face, step outer circle and step surface of the circular seat 12, and leave a machining allowance on each surface (about 2mm per side); turn the outer circle of the circular seat 12, and turn the annular sealing groove and bottom surface of the rectangular seat 11 to the requirements of the drawing; then mill and drill the four sides and connecting screw holes of the rectangular seat 11. In semi-finishing, since the rectangular seat, circular seat and pipe are now a whole, it is easy to clamp and ensure the machining quality.

[0068] In the argon arc welding in step ⑥ and step ⑦: the inclined surface of each section of the pipe is provided with an elliptical circumferential weld, without a groove, and the internal and external welds are both welded by argon arc welding.

[0069] Example 8

[0070] like Figure 4 、 Figure 5 As shown, in step ⑦: I spot welding: first place the rectangular seat 11 in the assembly formed by welding the rectangular seat segment 21 and the pipe III133 in the groove of the upper end face of the base 6 (with the bottom and side surfaces of the rectangular seat 11 for positioning), and fasten it to the base 6 by two bolts 7, then place the annular seat segment 22 in the positioning sleeve 3 (there is a clearance fit between the inner hole of the positioning sleeve 3 and the outer circle of the annular seat 12), then put the positioning sleeve 3 on the small circular ring of the positioning portion 53 of the support 5 (there is a clearance fit between the inner hole of the positioning sleeve 3 and the outer ring surface of the small circular ring of the positioning portion 53), align the elliptical surfaces of the assembly 23 and the annular seat segment 22, and then evenly spot weld several places to accurately position them; II argon arc welding: remove the positioning sleeve 3, disassemble the two bolts 7, take out the workpiece and perform argon arc welding to weld the assembly 23 and the annular seat segment 22 into a whole.

[0071] During spot welding, since the processing force is small, there is no need to provide auxiliary support for the workpiece, so the three screws 4 can be loosened so that they do not contact the pipe II 132 in the annular seat segment 22.

[0072] The fixture of the present invention ensures that the elliptical surface (i.e., circular oblique cross-section) between the assembly 23 formed by welding the rectangular seat segment 21 and the pipe III 133 and the annular seat segment 22 is reliable, thereby ensuring that the shape of the elbow conduit meets the requirements of the drawing.

[0073] Example 9

[0074] like Figure 6 、 Figure 7 As shown, in step ⑧: first, align the fixture and secure it to the lathe spindle. Then, fasten the rectangular seat in the workpiece to the base 6 with four bolts 7. Next, gently tighten the three screws 4 in sequence to compress the workpiece. Finally, finish lathe the outer circle, sealing end face, and stepped surface of the annular seat 12 to meet the requirements of the drawing. After finishing lathe, loosen the three screws 4 and remove the four bolts 7 to facilitate removal of the workpiece. Due to the high machining force during finish lathe, auxiliary support for the workpiece is required. Therefore, it is necessary to tighten the three screws 4 to compress the outer wall of the pipe III 133 to increase the system rigidity of the fixture.

[0075] As can be seen from the above, the spot welding in step ⑦ and the fine turning in step ⑧ of the present invention use the same fixture, thereby reducing production costs.

[0076] In summary, the processing method of the present invention simplifies the processing technology, improves the utilization rate of the connecting pipe material, facilitates clamping during semi-finishing, and the fixtures used for welding and finishing are universal, simple in structure, and easy to use. It has the advantages of low manufacturing cost, high processing efficiency, and reliable quality.

Claims

1. A method for processing an elbow catheter, the specific steps of which are: ① Material preparation: prepare the rectangular seat (11), prepare the circular seat (12), and cut the three connecting pipes in the middle as a whole (13), leaving a processing allowance; ② Rough machining: rough machining of the rectangular seat (11), rough machining of the circular seat (12), and rough machining of the integral connecting pipe (13) to a total length of H; ③ Assembly welding: Assemble and weld the rectangular seat (11), the integral pipe (13), and the circular seat (12) into one piece as required; ④ Semi-finishing: Finish the rectangular seat (11) to the required position and leave machining allowance on each side of the circular seat (12); ⑤ Wire cutting: Cut the semi-finished workpiece into three sections as required: a rectangular seat section (21) with a pipe connection I (131), a circular seat section (22) with a pipe connection II (132), and a pipe connection III (133); ⑥ Welding of the rectangular seat segment and the pipe III: I. Spot welding: Align the elliptical surface after line cutting and evenly spot weld the rectangular seat segment (21) and the pipe III (133) at several locations to accurately position the two; II. Argon arc welding: Weld the rectangular seat segment (21) and the pipe III (133) together to form an assembly (23); ⑦ Welding of the assembly and the annular seat segment: Ⅰ spot welding: Use a fixture to position and press the assembly (23) and the annular seat segment (22), align the elliptical surfaces of the two, and evenly spot weld several places to ensure accurate positioning; Ⅱ argon arc welding: weld the assembly (23) and the annular seat segment (22) into a whole; ⑧ Fine turning: Use the fixture to position and press the welded workpiece as a whole, and fine turn the annular seat (12) to the requirements of the drawing; the fixture includes a base (6), a positioning sleeve (3), and a support (5); the base (6) is disc-shaped, and a groove is opened in the middle of its upper end surface. The lower part of the support (5) is arranged in the groove and fixedly connected to the base (6), and the positioning sleeve (3) is placed on the support (5). The notch at the lower part of the positioning sleeve (3) and the notch at the upper part of the support (5) are in the same direction; In step ②: The total length of the integral pipe (13) after finishing is H: H = h1 + h2 + +2b / sina; where a, h1, h2, h, B, and a are all related dimensions of elbow conduit parts: a is the angle between the bevel of pipe I (131) and the pipe wall / the angle between the bevel of pipe II (132) and the pipe wall; h1 is the distance between the centers of the bevel and the plane of pipe I (131), and h2 is the distance between the centers of the bevel and the plane of pipe II (132); h is the vertical distance between the centers of the bevel of pipe I (131) and the bevel of pipe II (132); B is the horizontal distance between the centers of the bevel of pipe I (131) and the bevel of pipe II (132); where b is the slit spacing of wire cutting, which is 0.2 mm.

2. The processing method according to claim 1, wherein: Step ④ semi-finishing: through the four-claw calibration clamping rectangular seat (11) of the four sides, the outer circle of the ring seat (12), the sealing end face, the outer circle of the step and the step surface, all surfaces are left with a processing allowance; turn the outer circle of the ring seat (12), the annular sealing groove of the rectangular seat (11), the bottom surface to the drawing requirements; then milling and drilling the four sides of the rectangular seat (11) and the connecting screw holes.

3. The processing method according to claim 1, characterized in that: In the argon arc welding in step ⑥ and step ⑦: the inclined surface of each section of the pipe is provided with an elliptical circumferential weld, without a groove, and the internal and external welds are both welded by argon arc welding.

4. The processing method according to claim 1, characterized in that: in step 7: I spot welding: first place the rectangular seat (11) in the component (23) in the groove of the upper end surface of the base (6) and fasten it to the base (6) by two bolts (7), then place the annular seat segment (22) in the positioning sleeve (3), then put the positioning sleeve (3) on the small circular ring of the positioning portion (53), align the elliptical surfaces of the component (23) and the annular seat segment (22), and then evenly spot weld several places to accurately position them; II argon arc welding: remove the positioning sleeve (3), disassemble the two bolts (7), take out the workpiece and perform argon arc welding to weld the component (23) and the annular seat segment (22) into a whole.

5. The processing method according to claim 1 is characterized in that: in step ⑧: first, the clamp is aligned and fixed on the lathe spindle, and then the rectangular seat in the workpiece is fastened to the base (6) through four bolts (7), and then the three screws (4) are gently tightened in sequence to press the workpiece, and finally the outer circle, sealing end face, step surface, etc. of the annular seat (12) are fine-turned to meet the requirements of the drawing; after the fine turning is completed, the three screws (4) are loosened, and the four bolts (7) are removed, and the workpiece can be easily removed.

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