Optimization method, manufacturing device and process for plugging pipe clamp

Abstract

A plugging pipe clamp optimization method, manufacturing device and process, characterized by: including a die optimization scheme and / or a bolt optimization scheme. An optimized manufacturing device for a plugging pipe clamp, including a pipe clamp part to be wrapped around the outer wall of a pipe specimen; the pipe clamp part has a pipe clamp end cavity at both ends, and the pipe clamp end cavity has an inner die part to bite on the outer wall of the pipe specimen; an outer die part is axially movable between the inner die part and the inner wall of the pipe clamp end cavity. An optimized manufacturing device for a plugging pipe clamp, including an outer die connecting frame connected to the root and the end of the outer die part, and the outer die connecting frame is connected to an outer die mold to carry the outer die part. The present invention has reasonable design, compact structure and is easy to use.

Description

Technical Field

[0001] The invention relates to an optimization method, a manufacturing device and a process for sealing a pipe clamp. Background Art

[0002] The pipe clamp for sealing is an important repair tool for damaged high-pressure pipelines, and the locking mechanism is an important component that provides axial bearing capacity. The mechanism includes inner and outer dies, jacking flanges and jacking bolts, and grooves for the inner and outer dies to move need to be processed on the inner wall of the pipe clamp. The working process of the mechanism includes three processes: application of end jacking force, transmission of force between the inner and outer dies, and biting of the inner dies into the pipe. The application of end jacking force requires the cooperation of jacking bolts, bolt tensioners and jacking flanges; the transmission of force between the inner and outer dies depends on the contact between the inner and outer dies; the biting of the inner dies into the pipe depends on the extrusion of the pipe by the teeth on the dies. The content of the mechanism of the present invention includes the inner and outer dies, which are direct components of the locking mechanism, and jacking bolts that provide axial jacking force for the locking mechanism. Summary of the invention

[0003] The technical problem to be solved by the present invention is generally to provide a plugging pipe clamp optimization method, a manufacturing device and a process.

[0004] To solve the above problems, the technical solution adopted by the present invention is:

[0005] A method for optimizing a plugging pipe clamp, characterized by comprising a die optimization scheme and / or a bolt optimization scheme.

[0006] A device for optimizing the production of plugging pipe clamps includes a pipe clamp part that is wrapped around the outer wall of a pipe test piece; the pipe clamp part has a pipe clamp end cavity at both ends, and the pipe clamp end cavity has an inner die part that is engaged with the outer wall of the pipe test piece; an outer die part is axially movable between the inner die part and the inner wall of the pipe clamp end cavity.

[0007] A device for optimizing the production of a plugging pipe clamp comprises an outer die connecting frame connected to the root and the end of an outer die piece, and the outer die connecting frame is connected to an outer die mold to carry the outer die piece.

[0008] A plugging pipe clamp optimization manufacturing device comprises a processing bed of a machine tool; a front processing machine base and a rear processing machine base are arranged at both ends of the processing bed.

[0009] A plugging pipe clamp optimization manufacturing device, first, includes a manufacturing tooth spacing coefficient test device, which includes a simulated locking mechanism, an external fixing part, a simulated inner die made by an inner die piece and a simulated outer die made by an outer die piece, a microscope and a press.

[0010] An optimized manufacturing process for plugging pipe clamps is as follows:

[0011] S1, prefabricate at least the inner wall processing allowances of each part of the pipe clamp, the inner die and the outer die, and set a dividing line in the longitudinal direction of the outer side walls of the pipe clamp, the inner die and the outer die; then, weld an inner die connecting frame connected to the end of the inner die at the end of the cavity of the pipe clamp, weld an outer die connecting frame at the end of the outer die, and the outer die connecting frame is connected to an outer die jig to carry the outer die.

[0012] The invention has reasonable design, low cost, durability, safety and reliability, simple operation, time and labor saving, money saving, compact structure and convenient use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the tooth spacing coefficient test device of the present invention.

[0014] Figure 2 It is a schematic diagram of the use structure of the pipe clamp of the present invention.

[0015] Figure 3 It is a schematic diagram of the cavity structure of the pipe clamp end portion of the present invention.

[0016] Figure 4 It is a schematic structural diagram of an outer plate tooth piece of the present invention.

[0017] Figure 5 It is a schematic diagram of the tailstock structure of the inner die installation of the present invention.

[0018] Figure 6 It is a schematic diagram of the use structure of the inner die rotating gear plate of the present invention.

[0019] Figure 7 It is a schematic diagram of the processing bed structure of the present invention.

[0020] Figure 8 It is a structural schematic diagram of a processing lifting V-shaped seat of the present invention.

[0021] Fig. 9 It is a schematic diagram of the jacking allowance structure of the present invention.

[0022] Among them: 1. Pipe test piece; 2. Pipe clamp; 3. Pipe clamp end cavity; 4. Inner die piece; 5. Outer die piece; 6. Inner die connection frame; 7. Dividing line; 8. Outer die connection frame; 9. Outer die jig; 10. Outer die installation tailstock; 11. Outer die positioning inner cone; 12. Outer die fixing seat; 13. Outer die connection bolt; 14. Outer die input gear shaft; 15. Outer die front support frame; 16. Outer die rotating gear plate; 17. Outer die rotating end face threaded plate; 18. Outer die radial through groove; 19. Outer die guide slider; 20. Outer die bite seat; 21. Outer die process bracket; 22. Outer die telescopic top; 23. Processing the bed; 24. Processing the front machine base; 25. Processing the front center; 26. Processing the mounting plate; 27. Processing the clamping connection end; 28. Processing the rear machine base; 29. ​​Processing the rear center; 30. Processing the rotating lever; 31. Processing the longitudinal sliding seat; 32. Processing the lifting V-shaped seat; 33. Processing the machine head guide rail; 34. Processing the machine head slide; 35. Processing the rotating machine base; 36. Processing the fixed tool; 37. Processing the rotating tool; 38. Processing the lifting tool; 39. The jacking allowance; 40. The wedge angle; 41. The front angle of the top angle; 42. The back angle of the top angle; 43. The tooth top angle; 44. The sleeve; 45. The baffle step; 46. The pipe test piece; 47. The external fixing part. DETAILED DESCRIPTION

[0023] The present invention includes a die optimization scheme and a bolt optimization scheme;

[0024] The die optimization solution includes die material, die top angle, die height, die spacing, die pair number, workspace height, die wedge angle, front and rear angle combination of die top angle, die number and die initial position;

[0025] The optimization method is as follows:

[0026] Among them, the die optimization method is as follows:

[0027] S1.1, according to the bite depth requirements, determine the die material, die top angle, die height, and die spacing; determine the number of die pairs according to the pipe diameter; determine the working space height according to the thickness of the pipe clamp shell;

[0028] S1.2, optimize the die wedge angle;

[0029] Firstly, the three-dimensional plate tooth model is optimized according to the isosceles plate teeth using the wedge angles to be optimized;

[0030] Then, the contact stress of each tooth for each wedge angle scheme was calculated and extracted using ANSYS workbench software;

[0031] Secondly, the standard deviation of the contact stress of each tooth is calculated to ensure the uniformity of the contact stress of the plate teeth and complete the selection of the optimal wedge angle; by satisfying the uniformity of the contact stress of the plate teeth, the plate teeth and the plate teeth should be optimized during optimization to improve the uniformity of the contact stress of each tooth at the beginning of biting, ensure that the biting width of each tooth is not much different, and improve the stability of the load-bearing capacity.

[0032] S1.3, optimizing the front and rear angle combination of the plate tooth top angle, the front and rear angles include the top angle front angle 41 and the top angle back angle 42;

[0033] Firstly, according to the optimized wedge angle, the three-dimensional model of the die is optimized using the front and rear angle combination of the tooth top angle to be optimized; then, the contact stress of each tooth of each tooth top angle front and rear angle combination is calculated and extracted using ANSYS workbench software; secondly, the standard deviation of the contact stress of each tooth is calculated to ensure the uniformity of the contact stress of the die teeth and complete the selection of the optimal front and rear angle combination of the tooth top angle;

[0034] S1.4, calculate the number of teeth m required for the die;

[0035] First, the premise is that according to the shear bearing capacity of the plate teeth, when optimizing the plate teeth, the shear bearing capacity of the plate teeth should be ensured to be greater than half of the tensile bearing capacity of the intact pipe; then, the optimized shear bearing capacity of the plate teeth is taken to be equal to half of the tensile bearing capacity of the intact pipe, and the minimum number of plate teeth of the locking mechanism is calculated, where the safety factor is taken as 1.5, and the formula is:

[0036]

[0037] Where b is the bite width, t is the pipe wall thickness, σ b is the tensile strength of the pipe, [τ] is the shear strength of the plate teeth, D po is the outer diameter of the pipe;

[0038] S1.5, optimization of initial position of outer die;

[0039] First, since the initial position of the outer die affects whether the outer die can complete the axial jacking process, the distance between the outer die and the baffle should be greater than the axial jacking distance of the outer die; then, the jacking distance of the outer die includes two parts, one is the distance of the axial movement of the outer die during the process of the inner die completing the centering of the pipe, and the other is the distance of the axial movement of the outer die when the inner die completes the biting of the pipe and the outer die completes the biting of the pipe clamp housing wall; secondly, the minimum value of the distance between the outer die and the baffle, that is, the jacking margin 39, should be equal to the sum of the above two distances; the formula is:

[0040]

[0041] Among them, D Ci is the inner diameter of the pipe clamp, D Pois the outer diameter of the pipe, θ is the wedge angle of the die, b is the bite width, α is the front angle of the die vertex, and β is the back angle of the die vertex;

[0042] S1.6, Workspace Verification

[0043] After completing the optimization of the initial position and shape of the die, the optimization should be judged. If the working height of the inner and outer dies is greater than the working height of the locking mechanism provided by the pipe clamp housing, it is necessary to increase the number of die wedges to reduce the required working height of the inner and outer dies, and re-optimize the initial position of the die;

[0044] S1.7, plate tooth position determination;

[0045] Firstly, according to the calculated number of plate teeth, the tooth arrangement scheme is formed, and the preset plate tooth model is optimized; then, the contact stress of each tooth of each preset scheme is calculated and extracted using ANSYS workbench software, the standard deviation of each tooth contact stress is calculated, and the optimal tooth position scheme is determined based on the principle of uniformity of plate tooth contact stress;

[0046] The bolt optimization plan includes bolt material, bolt quantity and bolt model;

[0047] S2.1, select the bolt material and number of bolts;

[0048] S2.2, Experimental determination of tooth spacing coefficient

[0049] S2.2.1, Make a test device for the tooth spacing coefficient

[0050] It includes an external fixing part as a part of a simulated locking mechanism, a pipe test piece, a simulated inner die and a simulated outer die;

[0051] The outer fixing part includes a sleeve, a baffle and four bolts for fixing the baffle to the sleeve;

[0052] The sleeve uses a curved surface on one side to completely support the inner wall of the pipe, so that the entire inner wall of the pipe is evenly compressed, preventing the two ends of the pipe specimen from being compressed, causing the specimen to bend during the test and affecting the test results. Therefore, the radius of the curved surface is the same as the inner diameter of the pipe, and the width of the curved surface is the same as the projected length of the pipe specimen. The baffle is connected to the sleeve by bolts to simulate the baffle of the locking mechanism to prevent the inner die and the pipe specimen from sliding in the sleeve when the outer die is compressed, and to facilitate the replacement of the pipe specimen.

[0053] S2.2.2, vertical pressure is applied to obtain the bite mark;

[0054] First, a press is used to apply vertical pressure on the upper part of the simulated outer die during the test; then, more than five test bite forces are determined, three pipe specimens are used for each bite force, and a press is used to apply pressure to the test device to obtain bite marks on the pipe specimens;

[0055] S2.2.3, Bite Mark Width Measurement

[0056] First, use a microscope to measure the bite width of each bite mark of the pipe specimen at three locations, and take the average value as the width measurement value of the bite mark; then, take the average value of the bite mark width measurement values ​​of each bite mark as the bite mark width measurement value of the specimen; secondly, take the average value of the bite mark width measurement values ​​of the three pipe specimens as the bite width measurement value of the specimen under the force;

[0057] S2.2.4, first, substitute the measured bite width value of the specimen at each bite force into the bite width calculation formula of the pipe clamp locking mechanism to obtain the tooth spacing coefficient at each bite force, and take the average value of the tooth spacing coefficients under 5 bite forces, which is the tooth spacing coefficient of the die with this tooth shape and tooth spacing;

[0058]

[0059] Where b is the bite width, c is the tooth spacing coefficient, F is the bite force of a single tooth, α is the front angle of the tooth top angle, β is the back angle of the tooth top angle, L is the circumferential length of the tooth, σ s is the yield strength of the pipe;

[0060] S2.3, Calculation of the axial thrust force required for the locking mechanism

[0061] The end jacking force required by the locking mechanism satisfies the following formula:

[0062]

[0063] Where n is the number of inner dies in the locking mechanism, N is the pressure of each inner die on the pipe, θ is the wedge angle of the die, and f 1 is the friction coefficient between the inner and outer teeth, f 2 is the friction coefficient between the outer die and the shell;

[0064] S2.4. Determine the type of jacking bolt

[0065] First, according to the principle of tensile bearing capacity of jacking bolts, that is, in order to make the tensile bearing capacity of the repaired pipeline not less than that of the intact pipeline, the remaining tensile bearing capacity of the jacking bolts after pre-tightening should be greater than the tensile strength of the intact pipeline. Therefore, when optimizing the jacking bolts, it should be ensured that the tensile bearing capacity of the bolts is greater than the sum of the axial tensile bearing capacity of the intact pipeline and the jacking force at the end of the locking mechanism. The tensile bearing capacity of a single bolt is calculated, and the bolt model is determined according to the bolt material; among them, the effective area required for the bolt is:

[0066]

[0067] Among them, T is the axial tensile bearing capacity of the intact pipeline, Q is the end jacking force required by the locking mechanism, l is the number of jacking bolts at each end of the pipe clamp, and σ′ is the tensile strength of the bolt material.

[0068] like Figure 1 As shown, the plugging pipe clamp optimization manufacturing device of this embodiment includes a pipe clamp 2 to be wrapped on the outer wall of the pipe test piece 1; the pipe clamp 2 has a pipe clamp end cavity 3 at both ends, and the pipe clamp end cavity 3 has an inner die 4 to bite on the outer wall of the pipe test piece 1; an outer die 5 is axially movable between the inner die 4 and the inner cavity wall of the pipe clamp end cavity 3;

[0069] The outer die piece 5 and the inner die piece 4 are engaged with each other through an inclined wedge, and the outer die piece 5 is engaged with the inner wall of the cavity 3 at the end of the pipe clamp;

[0070] The pipe clamp 2 is an annular structure and has a rotating inner cavity;

[0071] An axial dividing line 7 is provided on the outer side wall of the pipe clamp 2 so as to be divided into corresponding individual pieces by a tool;

[0072] There are dividing lines on the outer die piece 5 and the inner die piece 4, so as to be divided into corresponding individual pieces by a cutting tool;

[0073] The inner die piece 4 and the outer die piece 5 each have a rotation cavity;

[0074] An inner die connecting frame 6 connected to the end of the inner die piece 4 is provided at the end of the pipe clamp end cavity 3 .

[0075] The plugging pipe clamp optimization manufacturing device of this embodiment includes an outer die connecting frame 8 connected to the root and the end of the outer die piece 5, and the outer die connecting frame 8 is connected to an outer die mold 9 to carry the outer die piece 5;

[0076] The outer die mold 9 includes an outer die fixing seat 12, an outer die mounting tailstock 10 disposed on the outer die fixing seat 12 and used for mounting on a machine tool, and an outer die positioning inner cone 11 disposed on the outer die mounting tailstock 10 and used for connecting with a corresponding cone of the machine tool;

[0077] An outer die connecting bolt 13 for connecting with a machine tool is arranged on the outer die fixing seat 12, an outer die front supporting frame 15 is arranged on the outer die fixing seat 12, an outer die rotating gear plate 16 is rotatably arranged between the outer die fixing seat 12 and the outer die front supporting frame 15, an outer die rotating end face threaded plate 17 is coaxially arranged on the outer die rotating gear plate 16, a gear for driving the outer die rotating gear plate 16 at one end is arranged on the outer die fixing seat 12, and an outer die input gear shaft 14 connected to a power source of the machine tool through a clutch at the other end is provided,

[0078] At least four outer die radial through grooves 18 are radially distributed on the end surface of the outer die front support frame 15, an outer die guide slider 19 is arranged in the outer die radial through groove 18, an outer die bite seat 20 is arranged at the bottom of the outer die guide slider 19 to bite with the outer die rotating end face threaded disk 17, and an outer die process bracket 21 is arranged on the outer die guide slider 19.

[0079] An external die telescopic tip 22 for extending out of the external die front support frame 15 is provided at the center of the external die fixing seat 12;

[0080] A positioning platform for welding with the head of the corresponding external die connecting frame 8 is provided on the external die process bracket 21;

[0081] The inner wall of the outer die piece 5 processed into a single piece is coated with dye, and the outer die process bracket 21 drives the outer die piece 5 processed into a single piece to move closer to or away from the outer wall of the inner die piece 4 through the outer die connecting frame 8, so as to inspect or repair the outer wall size of the inner die piece 4.

[0082] The plugging pipe clamp optimization manufacturing device of this embodiment includes a processing bed 23 of a machine tool; a front processing machine base 24 and a rear processing machine base 28 are arranged at both ends of the processing bed 23;

[0083] A processing front top 25 is horizontally arranged on the processing front machine base 24, a processing mounting plate 26 is rotatably or fixedly arranged on the processing front top 25, and a processing clamping connection end 27 is arranged on the processing mounting plate 26;

[0084] Before processing, the top 25 is used to butt the corresponding end surface of the pipe clamp 2 or the inner plate thread 4;

[0085] The processing installation plate 26 is used to connect the outer die 9 of the outer die piece 5;

[0086] A processing rear center 29 coaxial with the processing front center 25 is arranged on the processing rear base 28, and a processing rotary lever 30 is rotatably arranged on the processing rear base 28.

[0087] After processing, the top 29 is used to contact with the end surface of the pipe clamp 2 or the inner plate die 4; the rotating lever 30 is processed to drive the pipe clamp 2 to rotate;

[0088] A processing longitudinal sliding seat 31 is longitudinally arranged on the processing bed 23, and the processing longitudinal sliding seat 31 moves between the front processing machine base 24 and the rear processing machine base 28; a processing lifting V-shaped seat 32 is arranged on the processing longitudinal sliding seat 31 to lift the rotating outer end surface of the workpiece;.

[0089] A machining head guide rail 33 is longitudinally arranged on the machining bed 23, a machining head slide 34 is arranged on the machining head guide rail 33, a machining rotating machine base 35 rotating about a vertical axis is arranged on the machining head slide 34, and a machining fixed tool 36, a machining rotating tool 37 and a machining lifting tool 38 are circumferentially distributed on the machining rotating machine base 35;

[0090] A fixed machining tool 36 is used to machine the rotating part of the workpiece;

[0091] The machining rotary tool 37 rotates about the transverse axis and moves along the longitudinal direction to machine the dividing line on the workpiece.

[0092] The machining lifting tool 38 is lifted and lowered in the vertical direction and rotated about a transverse axis to cut the workpiece transversely.

[0093] The invention also includes a tooth spacing coefficient test device, which includes a simulated locking mechanism, an external fixing portion 47, a simulated inner die made of an inner die piece 4 and a simulated outer die made of an outer die piece 5, a microscope and a press;

[0094] The simulated locking mechanism includes an outer fixing portion 47; the outer fixing portion 47 includes a sleeve 44 and a bolt that fixes the baffle step 45 to the sleeve 44;

[0095] The sleeve 44 has a curved surface on one side to completely support the inner wall of the pipe test piece 46 so that the inner wall of the pipe test piece 46 is evenly compressed. The radius of the curved surface is the same as the inner diameter of the pipe test piece 46, and the width of the curved surface is the same as the projected length of the pipe test piece 46. The baffle step 45 is connected to the sleeve 44 by bolts.

[0096] The press applies vertical pressure on the upper part of the simulated outer die and obtains a bite mark on the pipe specimen 46;

[0097] The microscope measures the bite widths of multiple locations of each bite mark of the pipe specimen 46.

[0098] The plugging pipe clamp optimization manufacturing device of this embodiment first includes a manufacturing tooth spacing coefficient test device, which includes a simulated locking mechanism, an external fixing portion 47, a simulated inner die made by the inner die piece 4 and a simulated outer die made by the outer die piece 5, a microscope and a press;

[0099] The simulated locking mechanism includes an outer fixing portion 47; the outer fixing portion 47 includes a sleeve 44 and a bolt that fixes the baffle step 45 to the sleeve 44;

[0100] The sleeve 44 has a curved surface on one side to completely support the inner wall of the pipe test piece 46 so that the inner wall of the pipe test piece 46 is evenly compressed. The radius of the curved surface is the same as the inner diameter of the pipe test piece 46, and the width of the curved surface is the same as the projected length of the pipe test piece 46. The baffle step 45 is connected to the sleeve 44 by bolts.

[0101] The press applies vertical pressure on the upper part of the simulated outer die and obtains a bite mark on the pipe specimen 46;

[0102] The microscope measures the bite widths of multiple locations of each bite mark of the pipe specimen 46.

[0103] The optimized manufacturing process of the plugging pipe clamp in this embodiment is as follows:

[0104] S1, prefabricate at least the inner wall parts of the processing allowance and the pipe clamp 2, the inner die piece 4 and the outer die piece 5 which are the rotating body, and set the dividing line 7 in the longitudinal direction of the outer side wall of the pipe clamp 2, the inner die piece 4 and the outer die piece 5; then, weld the inner die connecting frame 6 connected to the end of the inner die piece 4 at the end of the cavity 3 at the end of the pipe clamp, and weld the outer die connecting frame 8 at the end of the outer die piece 5, and the outer die connecting frame 8 is connected with the outer die mold 9 to carry the outer die piece 5;

[0105] S2, first, the outer die mold 9 is installed on the front machine base 24, the outer die positioning inner cone 11 is inserted into the front top 25, the outer die connecting bolt 13 is connected to the processing clamping connection end 27, and the outer die input gear shaft 14 is connected to the power source on the processing installation disk 26 through a clutch; then, the processing installation disk 26 drives the outer die piece 5 to rotate, and the processing fixed tool 36 is used to process the rotating part of the outer die piece 5; secondly, the processing installation disk 26 is fixed after being screwed into the angle according to the scale line, and the processing rotary tool 37 is rotated along the transverse axis and moved along the longitudinal direction to process the dividing line on the outer die piece 5, and the outer die piece 5 is processed into the required simulated outer die;

[0106] S3, first, the pipe clamp 2 is mounted on the machine base 28 after processing, and the rotating outer end surface of the workpiece is lifted by the processing top 29 and the processing lifting V-shaped seat 32; then, the processing rotating lever 30 drives the pipe clamp 2 to rotate, and the various rotating parts of the pipe clamp 2 and the inner die 4 are processed by the processing fixed tool 36;

[0107] S4, first, move the front machine base 24 toward the rear machine base 28; then, the outer die input gear shaft 14 is connected to the clutch, and the outer die rotating gear plate 16 drives the outer die process bracket 21 to move radially at the same speed through the outer die rotating end face thread plate 17, so that the outer die piece 5 and the inner die piece 4 are wedge-shaped and matched; secondly, the dye is applied on the inner wall of the outer die piece 5 processed into a single piece, and the outer die process bracket 21 drives the outer die processed into a single piece through the outer die connecting frame 8 The inner die piece 5 moves toward or away from the outer wall of the inner die piece 4, and at the same time, the inner die piece 4 rotates, so as to inspect or repair the outer wall size, dyeing area and position of the inner die piece 4; again, according to the dyeing, the wedge angle of the inner die piece 4 is repaired; then, when the dyeing meets the set requirements, it is fixed after the angle is screwed in according to the scale line, and the dividing line is processed on the pipe clamp 2 and the inner die piece 4 by rotating the transverse axis of the machining rotary tool 37 and moving along the longitudinal direction, and the outer die piece 5 is processed into the required simulated outer die;

[0108] S5, start the machining lifting tool 38, lift it up and down in the vertical direction and rotate it about the transverse axis, so as to cut the workpiece transversely for simulation optimization.

[0109] In this embodiment, first, the plugging pipe clamp optimization manufacturing process is performed; then, the plugging pipe clamp optimization method is performed.

[0110] The optimized manufacturing process of the plugging pipe clamp of this embodiment is to perform the following steps according to the requirements of the drawings: A. Prefabricate the pipe clamp 2, the inner die piece 4 and the outer die piece 5 which are the machining allowances of at least the inner wall parts and are the rotating bodies, and set the dividing line 7 in the longitudinal direction of the outer side walls of the pipe clamp 2, the inner die piece 4 and the outer die piece 5; then, weld the inner die connecting frame 6 connected to the end of the inner die piece 4 at the end of the cavity 3 at the end of the pipe clamp, and weld the outer die connecting frame 8 at the end of the outer die piece 5, and the outer die connecting frame 8 is connected to the outer die mold 9 to carry the outer die piece 5;

[0111] B. First, the outer die mold 9 is installed on the front machine base 24, the outer die positioning inner cone 11 is inserted into the front top 25, the outer die connecting bolt 13 is connected to the processing clamping connection end 27, and the outer die input gear shaft 14 is connected to the power source on the processing installation disk 26 through a clutch; then, the processing installation disk 26 drives the outer die piece 5 to rotate, and the processing fixed tool 36 is used to process the rotating part of the outer die piece 5; secondly, the processing installation disk 26 is fixed after being screwed into the angle according to the scale line, and the processing rotary tool 37 is rotated along the transverse axis and moved along the longitudinal direction to process the dividing line on the outer die piece 5, and the outer die piece 5 is processed into the required outer die;

[0112] C. First, install the pipe clamp 2 on the machine base 28 after processing, and lift the rotating outer end surface of the workpiece through the processing center 29 and the processing lifting V-shaped seat 32; then, the processing rotating lever 30 drives the pipe clamp 2 to rotate, and the various rotating parts of the pipe clamp 2 and the inner die 4 are processed through the processing fixed tool 36;

[0113] D. First, move the front machine base 24 toward the rear machine base 28; then, the outer die input gear shaft 14 is connected to the clutch, and the outer die rotating gear plate 16 drives the outer die process bracket 21 to move radially at the same speed through the outer die rotating end face thread plate 17, so that the outer die piece 5 and the inner die piece 4 are paired at a wedge angle; secondly, the dye is applied on the inner wall of the outer die piece 5 processed into a single piece, and the outer die process bracket 21 drives the outer die processed into a single piece through the outer die connecting frame 8. The inner die piece 5 moves toward or away from the outer wall of the inner die piece 4, and at the same time, the inner die piece 4 rotates, so as to inspect or repair the outer wall size, dyeing area and position of the inner die piece 4; again, according to the dyeing, the wedge angle of the inner die piece 4 is repaired; then, when the dyeing meets the set requirements, it is fixed after the angle is screwed in according to the scale line, and the dividing line is processed on the pipe clamp 2 and the inner die piece 4 by rotating the transverse axis of the machining rotary tool 37 and moving along the longitudinal direction, and the outer die piece 5 is processed into the required outer die;

[0114] E. Start the machining lifting tool 38, lift it up and down in the vertical direction and rotate it about the transverse axis, so as to cut the machined workpiece transversely for clamping the pipeline test piece 1.

[0115] The present invention realizes high-precision machining by optimizing the design and cleverly designing the machining structure. The pipe clamp 2 ensures the machining size by pre-setting the rotating body and the inner die connecting frame 6, realizes the machining of high-precision workpieces by low-precision machine tools, and realizes one-size-fits-all high-precision production through one-time clamping and positioning, thereby ensuring the assembly requirements of each workpiece.

[0116] The longitudinal cutting is achieved through the dividing line 7, and the connecting frame of the process is used. Waste materials can be used to assemble the outer die mold 9, the outer die installation tailstock 10 is used as a carrier, the outer die positioning inner cone 11 realizes the rapid positioning of the taper, the outer die fixing seat 12 is used as a carrier, the outer die connecting bolt 13 realizes the detachable connection, the outer die input gear shaft 14 realizes the driving rotation, the outer die front support frame 15 is formed in the front cavity to accommodate the outer die rotating gear plate 16, the outer die rotating end face thread plate 17 and other parts, the outer die radial through groove 18, the outer die guide slider 19, the outer die bite seat 20 uses the end face spiral line principle to realize synchronous and same speed forward, and an outer die process bracket 21 is connected to a piece of outer die piece 5, so that the workpieces do not interfere with each other, and the spot welding connection ensures that the mold accuracy is not affected. The outer die telescopic top 22 is used to achieve centering.

[0117] The processing bed 23 is a carrier, the front machine base 24 can move longitudinally, the front center 25 can be centered, the processing mounting plate 26 can be fixed and rotatable, the built-in electromagnetic clutch can be engaged and disengaged, the rear center 29 can be centered, the processing rotary lever 30 can be rotated, the longitudinal sliding seat 31 can be moved longitudinally, the lifting V-shaped seat 32 can be adjusted, the machine head guide rail 33 can be guided, the machine head slide 34 can be moved, the rotating machine base 35 can be rotated, the fixed tool 36 can be rotated, the rotating tool 37 can be rotated, and the lifting tool 38 can be processed to realize the switching of tools at each station. The present invention can realize theoretical design optimization, experimental verification, and improve the processing accuracy to realize the processing of high-precision pipe clamps.

Claims

1. A plugging pipe clamp optimization method, characterized in that: It includes die optimization scheme and / or bolt optimization scheme; when it is for die optimization scheme, its contents include die material, die tooth top angle (43), die tooth tooth height, die tooth tooth spacing, die pair number, working space height, die wedge angle, front and rear angle combination of die tooth top angle, die tooth number and die initial position; the optimization method is as follows: Among them, the die optimization method is as follows: S1.1, according to the bite depth requirements, determine the die material, die top angle, die height, and die spacing; determine the number of die pairs according to the pipe diameter; determine the working space height according to the thickness of the pipe clamp shell; S1.2, optimize the die wedge angle (40); Firstly, using each wedge angle to be optimized (40), a three-dimensional plate tooth model is designed according to the isosceles plate tooth; Then, the contact stress of each tooth for each wedge angle (40) scheme was calculated and extracted using ANSYS workbench software; Secondly, the standard deviation of contact stress of each tooth is calculated to ensure the uniformity of contact stress of the plate teeth and complete the selection of the optimal wedge angle (40); S1.3, optimizing the front and rear angle combination of the plate tooth top angle (43); the front and rear angles include the top angle front angle (41) and the top angle back angle (42); Firstly, according to the optimized wedge angle (40), the front and rear angle combination of the tooth top angle (43) to be optimized is used to design the three-dimensional model of the die; then, the contact stress of each tooth of each tooth top angle front and rear angle combination is calculated and extracted using ANSYS workbench software; secondly, the standard deviation of the contact stress of each tooth is calculated to ensure the uniformity of the contact stress of the die teeth and complete the selection of the optimal tooth top angle front and rear angle combination; S1.4, calculate the number of teeth m required for the die; First, the premise is that according to the shear bearing capacity of the plate teeth, when optimizing the plate teeth, the shear bearing capacity of the plate teeth should be ensured to be greater than half of the tensile bearing capacity of the intact pipe; then, the optimized shear bearing capacity of the plate teeth is taken to be equal to half of the tensile bearing capacity of the intact pipe, and the minimum number of plate teeth of the locking mechanism is calculated, where the safety factor is taken as 1.5, and the formula is: Where b is the bite width, t is the pipe wall thickness, σ b is the tensile strength of the pipe, [τ] is the shear strength of the plate teeth, D po is the outer diameter of the pipe; S1.5, optimization of initial position of outer die; First, since the initial position of the outer die affects whether the outer die can complete the axial jacking process, the distance between the outer die and the baffle plate should be greater than the axial jacking distance of the outer die; then, the jacking distance of the outer die includes two parts: one is the distance of the axial movement of the outer die during the process of the inner die completing the centering of the pipe, and the other is the distance of the axial movement of the outer die when the inner die completes the biting of the pipe and the outer die completes the biting of the pipe clamp housing wall; second, the minimum value of the distance between the outer die and the baffle plate, i.e., the jacking margin (39), should be equal to the sum of the above two distances; the formula is: Among them, D Ci is the inner diameter of the pipe clamp, D Po is the outer diameter of the pipe, θ is the wedge angle of the die, b is the bite width, α is the front angle of the die vertex, and β is the back angle of the die vertex; S1.6, workspace verification; After the initial position and shape optimization of the die is completed, the optimization should be judged. If the working height of the inner and outer dies is greater than the working height of the locking mechanism provided by the pipe clamp housing, it is necessary to increase the number of die wedges to reduce the required working height of the inner and outer dies, and re-execute S1.5 to optimize the initial position of the die; S1.7, plate tooth position determination; Firstly, according to the calculated number of plate teeth, the tooth arrangement scheme is formed, and the preset plate tooth model is optimized; then, the contact stress of each tooth of each preset scheme is calculated and extracted using ANSYS workbench software, the standard deviation of each tooth contact stress is calculated, and the optimal tooth position scheme is determined based on the principle of uniformity of plate tooth contact stress; When optimizing the bolt plan, the content includes the bolt material, number of bolts and bolt model; S2.1, select the bolt material and number of bolts; S2.2, experimental determination of tooth spacing coefficient; S2.2.1, make a test device for the tooth spacing coefficient; It comprises a simulated locking mechanism, a pipeline test piece (46), a simulated inner die and a simulated outer die; the simulated locking mechanism comprises an outer fixing part (47); The outer fixing part (47) includes a sleeve (44), a baffle step (45) and a bolt for fixing the baffle step (45) to the sleeve (44); The sleeve (44) has a curved surface on one side to completely support the inner wall of the pipeline test piece (46) so that the inner wall of the entire pipeline test piece (46) is evenly compressed, thereby preventing the two ends of the pipeline test piece (46) from being compressed and causing the pipeline test piece (46) and the sleeve (44) to bend. The radius of the curved surface is the same as the inner diameter of the pipeline test piece (46), and the width of the curved surface is the same as the projected length of the pipeline test piece (46). The baffle step (45) is connected to the sleeve (44) by bolts to simulate the baffle step (45) of the locking mechanism, thereby preventing the inner die and the pipeline test piece (46) from sliding in the sleeve (44) when the outer die is compressed, and at the same time facilitating the replacement of the pipeline test piece (46). S2.2.2, vertical pressure is applied to obtain the bite mark; First, a press is used to apply vertical pressure on the upper part of the simulated outer die during the test; then, several test bite forces are determined, and a plurality of pipe test pieces (46) are used for each bite force, and a press is used to apply pressure to the test device to obtain bite marks on the pipe test pieces (46); S2.2.3, bite mark width measurement; First, a microscope is used to measure the bite widths of multiple locations of each bite mark of the pipe specimen (46), and the average value is taken as the width measurement value of the bite mark; then, the average value of the bite mark width measurement values ​​is taken as the bite mark width measurement value of the pipe specimen (46); secondly, the average value of the bite mark width measurement values ​​of multiple pipe specimens (46) is taken as the bite width measurement value of the pipe specimen (46) under the force; S2.2.4, first, substitute the measured bite width of the pipe test piece (46) at each bite force into the bite width calculation formula of the pipe clamp locking mechanism to obtain the tooth spacing coefficient at each bite force, and take the average value of the tooth spacing coefficients under multiple bite forces, which is the tooth spacing coefficient of the die with the tooth shape and tooth spacing; Where b is the bite width, c is the tooth spacing coefficient, F is the bite force of a single tooth, α is the front angle of the tooth top angle, β is the back angle of the tooth top angle, L is the circumferential length of the tooth, σ s is the yield strength of the pipe; S2.3, calculation of the axial thrust force required for the locking mechanism; The end jacking force required by the locking mechanism satisfies the following formula: Where n is the number of inner dies in the locking mechanism, N is the pressure of each inner die on the pipe, θ is the wedge angle of the die, f1 is the friction coefficient between the inner and outer dies, and f2 is the friction coefficient between the outer die and the housing; S2.

4. Determine the type of jacking bolt; First, according to the principle of tensile bearing capacity of jacking bolts, that is, in order to make the tensile bearing capacity of the repaired pipeline not less than that of the intact pipeline, the remaining tensile bearing capacity of the jacking bolts after pre-tightening should be greater than the tensile strength of the intact pipeline. Therefore, when optimizing the jacking bolts, it should be ensured that the tensile bearing capacity of the bolts is greater than the sum of the axial tensile bearing capacity of the intact pipeline and the jacking force at the end of the locking mechanism. The tensile bearing capacity of a single bolt is calculated, and the bolt model is determined according to the bolt material; among them, the effective area required for the bolt is: Among them, T is the axial tensile bearing capacity of the intact pipeline, Q is the end jacking force required by the locking mechanism, l is the number of jacking bolts at each end of the pipe clamp, and σ′ is the tensile strength of the bolt material.

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