CN114101713A - Large 90-degree bent pipe machining method and clamping fixture - Google Patents
Large 90-degree bent pipe machining method and clamping fixture Download PDFInfo
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- CN114101713A CN114101713A CN202111560932.8A CN202111560932A CN114101713A CN 114101713 A CN114101713 A CN 114101713A CN 202111560932 A CN202111560932 A CN 202111560932A CN 114101713 A CN114101713 A CN 114101713A
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- 238000003754 machining Methods 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 12
- 230000005484 gravity Effects 0.000 claims abstract description 17
- 238000003672 processing method Methods 0.000 claims abstract description 11
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 230000007246 mechanism Effects 0.000 claims description 35
- 238000003825 pressing Methods 0.000 claims description 23
- 235000000396 iron Nutrition 0.000 claims description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 238000005452 bending Methods 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 14
- 238000013461 design Methods 0.000 abstract description 11
- 230000000052 comparative effect Effects 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
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- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B1/00—Methods for turning or working essentially requiring the use of turning-machines; Use of auxiliary equipment in connection with such methods
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/062—Work-clamping means adapted for holding workpieces having a special form or being made from a special material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q7/00—Arrangements for handling work specially combined with or arranged in, or specially adapted for use in connection with, machine tools, e.g. for conveying, loading, positioning, discharging, sorting
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Abstract
The invention relates to the technical field of large-scale 90-degree elbow processing, and provides a large-scale 90-degree elbow processing method, which comprises the following steps: s1, manufacturing a clamping fixture; s2, establishing a three-dimensional model for vertically clamping the 90-degree bent pipe on the clamping fixture; adjusting the weight and the position of the counterweight, and recording data information of the weight and the position of the counterweight when the gravity center of the three-dimensional model is positioned on the vertical central line of the 90-degree bent pipe; s3, hoisting the clamping fixture to a vertical lathe workbench; vertically clamping the 90-degree bent pipe on a clamping part, and enabling the center line of the 90-degree bent pipe to coincide with the rotating center line of the vertical lathe workbench; then, the weight and the position of the weight member are adjusted to be in accordance with the data information recorded in step S2; and then starting a vertical lathe to machine the first end of the 90-degree bent pipe. The invention can solve the problem of larger processing error caused by inaccurate gravity center position in the prior art, and ensures that the quality of the large 90-degree bent pipe after processing meets the design requirement.
Description
Technical Field
The invention relates to the technical field of large 90-degree elbow processing, in particular to a large 90-degree elbow processing method and a clamping fixture.
Background
A90-degree bent pipe is arranged on the first circulating water path main pipeline of the nuclear reactor, and the end face of the pipe orifice of the 90-degree bent pipe and the adjacent cylindrical surface need to be subjected to finish machining. However, the 90-degree bent pipe is heavy, often weighing more than several tons, and the material hardness is high, so the machining difficulty is high. Conventionally, a 90-degree elbow is clamped on a workbench of a floor type boring machine in a horizontal mode to perform milling, however, due to the fact that the surface quality of milling is poor, bench workers are required to polish after milling, and time and labor are wasted.
The patent application with the publication number CN208614268U discloses a vertical installation tool for large bent pipes, by which a large bent pipe can be vertically installed with one end in a vertical state, so as to be turned by a vertical lathe. In the specific use process, however, when the vertical assembly tool is adopted to vertically assemble the bent pipe with the outer diameter of less than 900mm and the weight of less than 5 tons and the bent pipe is machined by a vertical lathe, the machining quality meets the design requirement; when the vertical installation tool is used for vertically installing the bent pipe with the outer diameter of more than or equal to 900mm and the weight of more than or equal to 5 tons, and the bent pipe is machined by a vertical lathe, the machining quality of the bent pipe often cannot meet the design requirement.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the processing method and the clamping fixture for the large 90-degree bent pipe are provided, so that the quality of the large 90-degree bent pipe with the outer diameter of more than or equal to 900mm and the weight of more than or equal to 5 tons after processing by a vertical lathe meets the design requirements.
The technical scheme adopted by the invention for solving the technical problems is as follows: the large 90-degree elbow processing method comprises the following steps:
s1, manufacturing a clamping fixture; the clamping fixture comprises a clamping part and a balancing part; the balancing part comprises a bottom plate detachably connected to one side of the clamping part, a counterweight part arranged on the bottom plate and close to or far away from the clamping part, and a first adjusting mechanism arranged between the bottom plate and the counterweight part;
s2, establishing two three-dimensional models in three-dimensional software, wherein the two ends of a 90-degree bent pipe are vertically clamped on clamping parts of a clamping fixture respectively; aiming at each three-dimensional model, adjusting the weight and the position of the counterweight, and recording data information of the weight and the position of the counterweight when the gravity center of the three-dimensional model is positioned on the vertical central line of the 90-degree bent pipe;
s3, hoisting the clamping fixture to a vertical lathe workbench; vertically clamping the first end of the 90-degree bent pipe on a clamping part, and enabling the center line of the first end of the 90-degree bent pipe to coincide with the rotation center line of the vertical lathe workbench; then, the weight and the position of the weight member are adjusted to be in accordance with the data information recorded in step S2; then fixing the clamping fixture on a vertical lathe workbench, and starting the vertical lathe to process the first end of the 90-degree bent pipe;
s4, after the step S3 is completed, vertically clamping the second end of the 90-degree bent pipe on the clamping part, and enabling the center line of the second end of the 90-degree bent pipe to coincide with the rotation center line of the vertical lathe workbench; then, the weight and the position of the weight member are adjusted to be in accordance with the data information recorded in step S2; and then fixing the clamping fixture on a vertical lathe workbench, and starting the vertical lathe to process the second end of the 90-degree bent pipe.
Further, the counterweight part comprises a counterweight frame which is slidably arranged on the bottom plate and a counterweight block which is placed in the counterweight frame; in steps S2-S4, the weight of the weight member is adjusted by adjusting the number of the counter weight blocks.
The clamping fixture for the large 90-degree elbow processing method comprises a clamping part and a balancing part; the balancing part comprises a bottom plate detachably connected to one side of the clamping part, a counterweight part arranged on the bottom plate and close to or far away from the clamping part, and a first adjusting mechanism arranged between the bottom plate and the counterweight part.
Furthermore, a pair of slide rails is fixed on the bottom plate; the counterweight is slidably mounted on the slide rail.
Further, the counterweight part comprises a counterweight frame which is slidably mounted on the slide rail and a counterweight block which is placed in the counterweight frame.
Further, the first adjusting mechanism comprises a first screw rod rotatably mounted on the bottom plate, and a first nut in threaded fit with the first screw rod; the first nut is connected with the weight.
Furthermore, the clamping component comprises two supporting plates which are arranged vertically and the end parts of the supporting plates are fixedly connected, and a pair of side plates are fixed between the two supporting plates; a clamping space is enclosed between the supporting plate and the side plate; and the side plates are provided with pressing mechanisms matched with each supporting plate.
Furthermore, hold-down mechanism includes the staple bolt of both ends respectively with two curb plate fixed connection, and the screw thread is installed on the staple bolt and is extended the compression bar towards rather than the backup pad that corresponds.
Furthermore, an ejector block is fixed at one end of the pressing rod facing the support plate.
Furthermore, each supporting plate is provided with a second adjusting mechanism matched with the pressing mechanism; the second adjusting mechanism comprises a second sliding rod, a V-shaped iron and a second screw rod; two ends of the second sliding rod are fixedly connected with the two side plates respectively; the two V-shaped irons are oppositely arranged and are slidably arranged on the second sliding rod; the second screw rod comprises two sections with opposite rotation directions, and the two sections of the second screw rod are respectively in threaded connection with the two V-shaped irons.
The invention has the beneficial effects that: according to the processing method and the clamping fixture for the large 90-degree bent pipe, provided by the embodiment of the invention, before the 90-degree bent pipe is processed by the vertical lathe, the gravity center position of a structure formed by the clamping fixture and the 90-degree bent pipe can be quickly and accurately adjusted to be superposed with the rotation center line of the vertical lathe workbench, the problem of larger processing error caused by inaccurate gravity center position in the prior art is solved, and the quality of the processed large 90-degree bent pipe with the outer diameter of more than or equal to 900mm and the weight of more than or equal to 5 tons can meet the design requirements.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below; it is obvious that the drawings in the following description are only some embodiments described in the present invention, and that other drawings can be obtained from these drawings by a person skilled in the art without inventive effort.
Fig. 1 is a perspective view of a large 90 ° elbow clamping fixture according to an embodiment of the present invention;
FIG. 2 is a schematic view of the trim component with the weight removed;
FIG. 3 is a schematic view of the structure of the chucking member;
fig. 4 is a state diagram of the large 90 ° elbow pipe clamping fixture according to the embodiment of the present invention after clamping the 90 ° elbow pipe.
The reference numbers in the figures are: 1-a clamping fixture, 10-a clamping part, 20-a balancing part, 30-90-degree bent pipes, 101-a support plate, 102-a side plate, 103-a clamping space, 104-a pressing mechanism, 105-a hoop, 106-a pressing rod, 107-a top block, 108-a second adjusting mechanism, 109-a second sliding rod, 110-V-shaped iron, 111-a second screw rod, 201-a bottom plate, 202-a counterweight part, 203-a first adjusting mechanism, 204-a sliding rail, 205-a counterweight frame, 206-a counterweight block, 207-a first screw rod, 208-a first nut and 209-a screw rod support.
Detailed Description
In order that those skilled in the art will better understand the present invention, the following further description is provided in conjunction with the accompanying drawings and examples. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. The embodiments and features of the embodiments of the invention may be combined with each other without conflict.
The embodiment of the invention provides a processing method of a large 90-degree elbow, which comprises the following steps:
s1, manufacturing a clamping fixture 1; the clamping fixture 1 comprises a clamping component 10 and a balancing component 20; the trim component 20 comprises a bottom plate 201 detachably connected to one side of the card installing component 10, a weight component 202 arranged on the bottom plate 201 and close to or far away from the card installing component 10, and a first adjusting mechanism 203 arranged between the bottom plate 201 and the weight component 202;
s2, establishing two three-dimensional models for vertically clamping two ends of the 90-degree bent pipe 30 on the clamping part 10 of the clamping fixture 1 in three-dimensional software respectively; adjusting the weight and position of the weight 202 for each three-dimensional model, and recording data information of the weight and position of the weight 202 when the gravity center of the three-dimensional model is located on the vertical center line of the 90 ° elbow 30;
s3, hoisting the clamping fixture 1 to a vertical lathe workbench; vertically clamping a first end of the 90-degree bent pipe 30 on the clamping part 10, and enabling a center line of the first end of the 90-degree bent pipe 30 to coincide with a rotation center line of the vertical lathe workbench; then, the weight and the position of the weight member 202 are adjusted so as to be in accordance with the data information recorded in step S2; then fixing the clamping fixture 1 on a vertical lathe workbench, and starting the vertical lathe to process the first end of the 90-degree bent pipe 30;
s4, after the step S3 is completed, vertically clamping the second end of the 90-degree bent pipe 30 on the clamping part 10, and enabling the center line of the second end of the 90-degree bent pipe 30 to coincide with the rotation center line of the vertical lathe workbench; then, the weight and the position of the weight member 202 are adjusted so as to be in accordance with the data information recorded in step S2; and then fixing the clamping fixture 1 on a vertical lathe workbench, and starting the vertical lathe to process the second end of the 90-degree bent pipe 30.
In step S1, the clamping component 10 is used for vertically clamping the 90 ° elbow 30; the trim part 20 is used to adjust the position of the center of gravity of the chucking jig 1. Specifically, the first adjusting mechanism 203 is used for adjusting the distance between the weight 202 and the chucking part 10, and the weight of the weight 202 is adjusted, so as to adjust the gravity center of the whole chucking fixture 1. To facilitate the adjustment of the weight member 202, preferably, the weight member 202 includes a weight frame 205 slidably mounted on the base plate 201 and a weight 206 disposed in the weight frame 205. In operation, the weight of the weight member 202 may be adjusted by simply increasing or decreasing the number of clump weights 206.
In step S2, two three-dimensional models are established in three-dimensional software such as CAD, UG, SOLIDWORKS, and the like; the first three-dimensional model comprises a clamping fixture 1 and a 90-degree bent pipe 30, wherein the 90-degree bent pipe 30 is clamped on the clamping component 10, and the center line of the first end of the 90-degree bent pipe 30 is vertically arranged; the second three-dimensional model comprises a clamping fixture 1 and a 90-degree bent pipe 30, wherein the 90-degree bent pipe 30 is clamped on the clamping component 10, and the central line of the second end of the 90-degree bent pipe 30 is vertically arranged.
According to the processing method of the large 90-degree bent pipe provided by the embodiment of the invention, through the steps S1-S2, the weight and the position of the weight 202 when the gravity center of the structure formed by the clamping fixture 1 and the 90-degree bent pipe 30 is located on the vertical central line of the 90-degree bent pipe can be rapidly and accurately obtained, so that a reference is provided for the adjustment in the steps S3 and S4, the gravity center position of the structure formed by the clamping fixture and the 90-degree bent pipe can be accurately adjusted to be overlapped with the rotating central line of the vertical lathe workbench in the steps S3 and S4, the problem that the processing error is large due to the inaccurate gravity center position in the prior art is solved, and the quality of the large 90-degree bent pipe with the outer diameter being larger than or equal to 900mm and the weight being larger than or equal to 5 tons is ensured to meet the design requirements after processing.
Referring to fig. 1 to 3, a chucking fixture 1 according to an embodiment of the present invention includes a chucking member 10 and a balancing member 20; the trim member 20 includes a base plate 201 detachably connected to one side of the card-mounting member 10, a weight member 202 disposed on the base plate 201 and adjacent to or remote from the card-mounting member 10, and a first adjusting mechanism 203 disposed between the base plate 201 and the weight member 202.
Referring to fig. 1 and 2, the trim component 20 includes a base plate 201, a weight 202, and a first adjustment mechanism 203.
The bottom plate 201 is horizontally arranged on one side of the card-loading part 10, and one end of the bottom plate 201 is detachably connected with the card-loading part 10 through at least one connecting plate 209. The connecting plate 209 is substantially arc-shaped, one end of the connecting plate 209 is connected with the bottom plate 201 through a bolt, and the other end of the connecting plate 209 is connected with the clamping part 10 through a bolt.
A pair of slide rails 204 is fixed on the bottom plate 201; the weight member 202 is slidably mounted on the slide rail 204, so that the weight member 202 can linearly move toward or away from the card-mounting member 10 under the guiding action of the slide rail 204. To facilitate the adjustment of the weight member 202, preferably, the weight member 202 includes a weight frame 205 and a weight 206 placed within the weight frame 205. The counterweight frame 205 is slidably mounted on the slide rail 204; the counterweight frame 205 is a frame structure with an opening at the top, and a plurality of counterweight blocks 206 are placed in the counterweight frame 205 from bottom to top. In operation, by adjusting the number of weights 206, the weight of the weight member 202 may be adjusted.
The first adjusting mechanism 203 is used for adjusting the position of the counterweight 202 on the slide rail 204, so as to achieve the purpose of adjusting the center of gravity of the clamping fixture. The first adjusting mechanism 203 may be an air cylinder, a hydraulic cylinder, an electric push rod, or the like. Preferably, the first adjusting mechanism 203 comprises a first screw 207 rotatably mounted on the base plate 201, a first nut 208 screw-fitted on the first screw 207; the first nut 208 is connected to the weight member 202. The first screw 207 is arranged between the two slide rails 204, the first screw 207 is arranged parallel to the axial direction of the slide rails 204, and two ends of the first screw 207 are rotatably mounted on the bottom plate 201 through screw brackets 209.
Referring to fig. 1 and 3, the card installing component 10 includes two support plates 101 that are perpendicular to each other and have end portions fixedly connected, and a pair of side plates 102 fixed between the two support plates 101; a clamping space 103 is defined between the supporting plate 101 and the side plate 102; the side plates 102 are provided with a pressing mechanism 104 for cooperating with each support plate 101.
One of the support plates 101 is parallel to the bottom plate 201, and the other support plate 101 is perpendicular to the bottom plate 201. The base plate 201 is detachably connected to the support plate 101 perpendicular to the base plate 201 by a connection plate 209. When the 90-degree bent pipe is clamped in the clamping space 103 in a rotating manner, the 90-degree bent pipe is firstly placed in the clamping space 103, two sections of the bent pipe are respectively abutted against the two supporting plates 101, the left side and the right side of the bent pipe are limited through the two side plates 102, and then the bent pipe is tightly pressed on the corresponding supporting plates 101 through the pressing mechanism 104.
According to the clamping part 10 provided by the embodiment of the invention, after one end of the 90-degree bent pipe is processed, the clamping part 10 can be directly turned over by 90 degrees under the condition that the bent pipe is not detached, so that the other end of the 90-degree bent pipe can be processed, the use is convenient, and the processing efficiency can be greatly improved.
The pressing mechanism 104 may include a U-bolt, a nut, and a fixing block; a fixed block is fixed on the outer surface of each side plate 102; and two ends of the U-shaped bolt respectively penetrate through the through holes on the two fixing blocks and then are connected with the nut.
Preferably, the pressing mechanism 104 includes two hoops 105 fixedly connected to the two side plates 102, respectively, and a pressing rod 106 threadedly mounted on the hoops 105 and extending toward the corresponding support plate 101. The end part of the hoop 105 is detachably connected with the corresponding side plate 102 through a bolt; the outer surface of the pressing rod 106 is provided with external threads; the hold-down bar 106 is disposed perpendicular to the support plate 101 corresponding thereto, and is screw-coupled with the anchor ear 105. When the 90-degree elbow is clamped, the anchor ear 105 is firstly detached from the side plate 102, then the 90-degree elbow is placed in the clamping space 103, then the anchor ear 105 is installed on the side plate 102, then the pressing rod 106 is screwed to enable the end part of the pressing rod to be abutted against the outer surface of the 90-degree elbow, and the pressing rod 106 is screwed continuously to press the 90-degree elbow on the supporting plate 101. In order to increase the contact area of the pressing rod 106 and the 90 ° elbow, preferably, the end of the pressing rod 106 facing the support plate 101 is fixed with a top block 107.
In order to increase the application range of the clamping part 10 and enable the clamping part to clamp 90-degree bent pipes with different sizes, preferably, a second adjusting mechanism 108 matched with the pressing mechanism 104 is arranged on each supporting plate 101; the second adjusting mechanism 108 comprises a second slide bar 109, a V-shaped iron 110 and a second screw 111; two ends of the second sliding rod 109 are respectively fixedly connected with the two side plates 102; the two V-shaped irons 110 are oppositely arranged and are slidably arranged on the second sliding rod 109; the second screw 111 comprises two sections with opposite rotation directions, and the two sections of the second screw 111 are respectively in threaded connection with the two V-shaped irons 110.
The second adjusting mechanism 108 comprises two second sliding rods 109 arranged in parallel, and each V-shaped iron 110 is slidably mounted on the two second sliding rods 109. The two V-shaped irons 110 in each second adjustment mechanism 108 are oppositely arranged and form a V-shaped supporting space therebetween. When the adjusting device is used, the two V-shaped irons 110 can be controlled to approach or depart from each other only by rotating the second screw rod 111, so that the purpose of adjusting the distance between the two V-shaped irons 110 is achieved.
When the 90-degree bent pipe is clamped, the two V-shaped irons 110 are adjusted to be close to or far away from each other through the second screw 111 according to the diameter of the bent pipe, after the distance between the two V-shaped irons 110 is adjusted, the 90-degree bent pipe is placed in the clamping space 103 and supported on the V-shaped irons 110, the left side and the right side of the bent pipe are limited through the V-shaped irons 110, and then the 90-degree bent pipe is pressed on the V-shaped irons 110 through the pressing mechanism 104.
Comparative example 1:
providing a large 90-degree elbow pipe, wherein the size is as follows: 900mm in outside diameter, 80mm in wall thickness and 12 tons in weight. The design requirements are as follows: the roughness of the end surface and the cylindrical surface of the pipe orifice of the bent pipe is Ra3.2, the planeness of the end surface is 0.1mm, and the cylindricity is 0.15 mm.
Processing: hoisting the clamping fixture 1 to a vertical lathe workbench, clamping the 90-degree bent pipe on the clamping fixture 1, and enabling the center line of the 90-degree bent pipe to coincide with the rotation center line of the vertical lathe workbench; then, the position of the counterweight part is manually and repeatedly adjusted on the vertical lathe workbench, so that the total gravity center of an object on the vertical lathe workbench is positioned on the rotation center line of the vertical lathe workbench; and then, fixing the clamping fixture on a vertical lathe workbench, and performing finish machining on the 90-degree bent pipe by using a vertical lathe.
And (3) detecting the parts after finish machining: the roughness of the end face and the cylindrical surface is Ra1.6, the planeness of the end face is 0.08mm, the cylindricity is 0.21mm, and the design requirement is not met.
Example 1:
providing a large 90-degree elbow pipe, wherein the size is as follows: 900mm in outside diameter, 80mm in wall thickness and 12 tons in weight. The design requirements are as follows: the roughness of the end surface and the cylindrical surface of the pipe orifice of the bent pipe is Ra3.2, the planeness of the end surface is 0.1mm, and the cylindricity is 0.15 mm.
The 90-degree bent pipe is processed by the processing method provided by the embodiment of the invention. And (3) detecting the parts after finish machining: the roughness of the end face and the cylindrical surface is Ra1.6, the planeness of the end face is 0.05mm, and the cylindricity is 0.09mm, so that the design requirement is met.
It should be noted that the comparative examples and examples described above all used the same vertical lathe for machining 90 ° bends.
After intensive research, the inventor finds that the mode of manually and repeatedly adjusting the balance weight in the comparative example not only wastes time and labor, but also is difficult to adjust the total gravity center of an object on the vertical lathe workbench to be coincident with the rotation center line of the vertical lathe workbench; therefore, when the vertical lathe workbench drives the 90-degree bent pipe and the clamping fixture 1 to rotate, centrifugal force is generated, the larger the size and the weight of the 90-degree bent pipe are, the larger the centrifugal force is, and the larger the deviation of the cylindricity of the 90-degree bent pipe after finish machining is.
According to the method for machining the large 90-degree bent pipe, provided by the embodiment of the invention, the weight and the position of the counterweight 202 can be accurately determined through the simulation of three-dimensional software, and a reference is provided for subsequent adjustment, so that the gravity center position of a structure formed by the clamping fixture and the 90-degree bent pipe can be quickly and accurately adjusted on the vertical lathe workbench to be overlapped with the rotation center line of the vertical lathe workbench, the problem of larger machining error caused by inaccurate gravity center position in the prior art is solved, and the quality of the large 90-degree bent pipe after machining meets the design requirement.
The processing method and the clamping fixture for the large 90-degree bent pipe provided by the embodiment of the invention are particularly suitable for processing the large 90-degree bent pipe with the outer diameter of more than or equal to 900mm and the weight of more than or equal to 5 tons, and can ensure the processing quality; of course, the invention is also suitable for processing small 90-degree bent pipes with the outer diameter less than 900mm and the weight less than 5 tons, and can ensure the processing quality.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The large 90-degree elbow processing method is characterized by comprising the following steps of:
s1, manufacturing a clamping fixture (1); the clamping fixture (1) comprises a clamping part (10) and a balancing part (20); the balancing part (20) comprises a bottom plate (201) detachably connected to one side of the clamping part (10), a weight part (202) arranged on the bottom plate (201) and capable of being close to or far away from the clamping part (10), and a first adjusting mechanism (203) arranged between the bottom plate (201) and the weight part (202);
s2, establishing two three-dimensional models for vertically clamping two ends of a 90-degree bent pipe (30) on a clamping part (10) of a clamping fixture (1) in three-dimensional software respectively; for each three-dimensional model, adjusting the weight and position of the weight (202), and recording data information of the weight and position of the weight (202) when the gravity center of the three-dimensional model is positioned on the vertical central line of the 90-degree elbow (30);
s3, hoisting the clamping fixture (1) to a vertical lathe workbench; vertically clamping the first end of the 90-degree bent pipe (30) on the clamping part (10), and enabling the center line of the first end of the 90-degree bent pipe (30) to coincide with the rotation center line of the vertical lathe workbench; then adjusting the weight and position of the weight member (202) to be in accordance with the data information recorded in step S2; then fixing the clamping fixture (1) on a vertical lathe workbench, and starting the vertical lathe to process the first end of the 90-degree bent pipe (30);
s4, after the step S3 is completed, vertically clamping the second end of the 90-degree bent pipe (30) on the clamping part (10), and enabling the center line of the second end of the 90-degree bent pipe (30) to coincide with the rotation center line of the vertical lathe workbench; then adjusting the weight and position of the weight member (202) to be in accordance with the data information recorded in step S2; and then fixing the clamping fixture (1) on a vertical lathe workbench, and starting the vertical lathe to process the second end of the 90-degree bent pipe (30).
2. The large 90 ° pipe bending method according to claim 1, wherein the weight member (202) comprises a weight frame (205) slidably mounted on the bottom plate (201) and a weight block (206) placed inside the weight frame (205); in steps S2-S4, the weight of the weight member (202) is adjusted by adjusting the number of the counter weights (206).
3. The clamping fixture for the large 90-degree elbow machining method according to claim 1 is characterized by comprising a clamping part (10) and a balancing part (20); the trim part (20) comprises a bottom plate (201) detachably connected to one side of the clamping part (10), a weight part (202) arranged on the bottom plate (201) and capable of being close to or far away from the clamping part (10), and a first adjusting mechanism (203) arranged between the bottom plate (201) and the weight part (202).
4. The chucking jig of claim 3, characterized in that a pair of slide rails (204) are fixed on the base plate (201); the weight part (202) is installed on the sliding rail (204) in a sliding mode.
5. The chucking jig of claim 4, characterized in that the weight member (202) comprises a weight frame (205) slidably mounted on the slide rail (204) and a weight block (206) placed inside the weight frame (205).
6. The chucking jig of claim 3, characterized in that the first adjusting mechanism (203) comprises a first screw (207) rotatably mounted on the base plate (201), a first nut (208) screw-fitted on the first screw (207); the first nut (208) is connected to the weight member (202).
7. The chucking jig of claim 3, characterized in that the chucking member (10) includes two support plates (101) arranged perpendicularly to each other and having end portions fixedly connected, a pair of side plates (102) fixed between the two support plates (101); a clamping space (103) is enclosed between the supporting plate (101) and the side plate (102); and the side plates (102) are provided with pressing mechanisms (104) matched with each supporting plate (101).
8. The chucking jig of claim 7, wherein the pressing means (104) includes an anchor ear (105) having both ends fixedly connected to the two side plates (102), respectively, and a pressing rod (106) screw-fitted to the anchor ear (105) and extending toward the support plate (101) corresponding thereto.
9. The chucking jig of claim 8, characterized in that the end of the pressing rod (106) facing the support plate (101) is fixed with a top block (107).
10. The chucking jig of claim 8 or 9, characterized in that each support plate (101) is provided with a second adjusting mechanism (108) cooperating with the pressing mechanism (104);
the second adjusting mechanism (108) comprises a second sliding rod (109), a V-shaped iron (110) and a second screw (111); two ends of the second sliding rod (109) are respectively fixedly connected with the two side plates (102); the two V-shaped irons (110) are oppositely arranged and are slidably arranged on the second sliding rod (109); the second screw (111) comprises two sections with opposite rotating directions, and the two sections of the second screw (111) are respectively in threaded connection with the two V-shaped irons (110).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111560932.8A CN114101713A (en) | 2021-12-20 | 2021-12-20 | Large 90-degree bent pipe machining method and clamping fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111560932.8A CN114101713A (en) | 2021-12-20 | 2021-12-20 | Large 90-degree bent pipe machining method and clamping fixture |
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| Publication Number | Publication Date |
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| CN114101713A true CN114101713A (en) | 2022-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111560932.8A Pending CN114101713A (en) | 2021-12-20 | 2021-12-20 | Large 90-degree bent pipe machining method and clamping fixture |
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| CN (1) | CN114101713A (en) |
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| CN115008177A (en) * | 2022-04-30 | 2022-09-06 | 嘉兴迈思特管件制造有限公司 | Automatic assembling equipment and method for rail transit elbow joint |
| CN117283029A (en) * | 2023-11-14 | 2023-12-26 | 河北欧特管道设备制造有限公司 | Cutting device for manufacturing bent pipe |
| CN117884848A (en) * | 2024-03-18 | 2024-04-16 | 四川优机精密机械制造有限公司 | Processing method of oil transportation elbow joint of aircraft engine |
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Application publication date: 20220301 |