CN113210761A - Efficient machining device for internal threads of deep-sea ore-raising pipe joint and using method of efficient machining device - Google Patents
Efficient machining device for internal threads of deep-sea ore-raising pipe joint and using method of efficient machining device Download PDFInfo
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- CN113210761A CN113210761A CN202110589932.4A CN202110589932A CN113210761A CN 113210761 A CN113210761 A CN 113210761A CN 202110589932 A CN202110589932 A CN 202110589932A CN 113210761 A CN113210761 A CN 113210761A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/22—Machines specially designed for operating on pipes or tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
- B23G1/00—Thread cutting; Automatic machines specially designed therefor
- B23G1/44—Equipment or accessories specially designed for machines or devices for thread cutting
- B23G1/52—Equipment or accessories specially designed for machines or devices for thread cutting for operating on pipes or tubes
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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
- B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
- B23Q5/02—Driving main working members
- B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
- B23Q5/10—Driving main working members rotary shafts, e.g. working-spindles driven essentially by electrical means
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Abstract
The invention discloses a high-efficiency machining device for deep sea ore raising pipe joint internal threads and a using method thereof, and the high-efficiency machining device comprises an ultrasonic vibration device arranged on a machine tool, wherein the ultrasonic vibration device is connected with a first connecting piece through a fastening bolt, the first connecting piece is tightly connected with a cylindrical supporting piece through a bolt, a motor is arranged in the supporting piece, the motor is connected with a cutter head through a transmission shaft, and the cutter head is connected with a blade; the motor is fixedly connected with the supporting piece through the second connecting piece, and the cutter head is fixedly connected with the supporting piece through the third connecting piece. The invention provides the efficient machining device and method capable of realizing the special internal threads on the common lathe, so that the machining precision and efficiency of the external threads are improved, and the service performance of the ore-raising pipe connecting piece is improved.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the field of machining, in particular to a high-efficiency machining device for deep-sea ore-raising pipe joint internal threads.
[ background of the invention ]
The external threads at the two ends of the pipe body are connected with the internal threads of the pipe joint. In order to meet the requirements of high sealing performance and impact resistance under high-pressure high-frequency impact in deep sea working conditions, the connecting external thread generally adopts a variable groove width and variable groove depth thread structure, and the geometric structure is complex. As the conventional thread machining process, the machining precision and the machining efficiency of the turning are difficult to meet the requirement of machining the external thread of the deep-sea ore-raising pipe joint. Meanwhile, the special machine tool for the poplar pipes is long in production period and high in cost.
[ summary of the invention ]
The invention discloses an efficient machining device for deep-sea ore-raising pipe joint internal threads and a using method thereof. The invention provides the efficient machining device and method capable of realizing the special internal threads on the common lathe, so that the machining precision and efficiency of the external threads are improved, and the service performance of the ore-raising pipe connecting piece is improved.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a high-efficiency machining device for deep sea ore raising pipe joint internal threads comprises an ultrasonic vibration device 1 installed on a machine tool, wherein the ultrasonic vibration device 1 is connected with a first connecting piece 2 through a fastening bolt, the first connecting piece 2 is tightly connected with a cylindrical supporting piece 3 through a bolt, a motor 4 is installed in the supporting piece 3, the motor 4 is connected with a cutter head 5 through a transmission shaft 9, and the cutter head 5 is connected with a blade 6; the motor 4 is fixedly connected with the supporting piece 3 through a second connecting piece 7, and the cutter head 5 is fixedly connected with the supporting piece 3 through a third connecting piece 8.
In a further improvement, the first connecting piece 2 is a high manganese steel gasket; the second connecting piece 7 and the third connecting piece 8 are both connecting rods.
In a further improvement, the centers of a workbench and a cutter head 5 of the machine tool are respectively provided with a non-contact sensor, and the two non-contact sensors form a pair of non-contact sensors to detect the relative positions of a workpiece and the center of a cutter.
The use method of the high-efficiency machining device for the internal thread of the deep-sea ore-raising pipe joint comprises the following steps:
firstly, mounting non-contact sensors at the centers of a workbench and a cutter head 5 of a machine tool, and measuring the relative x, y and z-direction positions of two non-contact sensors before an ultrasonic device and a poplar pipe joint are mounted on the machine tool; machine tool driveDriving the spindle of the machine tool to move and deflect a preset distance, and the deflection angle alpha in the plane x-y, y-z and x-z1，β1，γ1The displacement of the machine tool main shaft along the x, y and z axes under the x-y-z coordinate system is x respectively1，y1，z1；
Secondly, the machine tool is provided with an ultrasonic vibration device (1) and a poplar pipe joint (10), the relative x, y and z-direction positions of the cutter and the workbench are measured, then a machine tool driving device drives a machine tool spindle to move and deflect for a preset distance, and the deflection angles in the plane x-y, y-z and x-z are respectively alpha2，β2，γ2The displacement of the machine tool spindle along the x, y and z axes under the x-y-z coordinate system is x respectively2，y2，z2；
Step three, obtaining the error influence quantity of the machine tool after the ultrasonic vibration device (1) and the poplar pipe joint are installed:
Δx＝x2-x1
Δy＝y2-y1
Δz＝z2-z1
Δα＝α2-α1
Δβ＝β2-β1
Δγ＝γ2-γ1
wherein, Δ x is the displacement error of the machine tool spindle in the x-axis direction; delta y is the displacement error of the machine tool spindle in the y-axis direction; delta z is the displacement error of the machine tool spindle in the z-axis direction; delta alpha is the angle error of the deflection motion of the machine tool main shaft in the x-y plane; delta beta is the angle error of the deflection motion of the machine tool main shaft in the y-z plane; delta gamma is the angle error of the deflection motion of the machine tool main shaft in the x-z plane;
the deflection error gradually decreases from the end of the poplar pipe joint to the clamping position of the driving device, and the errors in the x, y and z directions along the length of the pipe joint axis are respectively as follows:
φ(l)＝Δx+ltanΔα
ω(l)＝Δy+ltanΔβ
ψ(l)＝Δz+ltanΔγ
wherein l is the axial distance between the poplar pipe joint and the clamping position; phi (l), omega (l) and psi (l) respectively represent the errors in the directions of an x axis, a y axis and a z axis at the position where the distance is l from the tail end of the pipe joint of the ore raising pipe; the delta x, the delta y and the delta z are respectively displacement errors of the poplar pipe joint in the directions of an x axis, a y axis and a z axis away from the clamping position;
step four, because the internal thread of the poplar pipe joint is variable in groove width and depth, the variation process follows the linear rule along the length of the thread, and the width of the access thread of the internal thread is set to be L1Depth of h1Outlet thread width of L2Depth of h2(ii) a Because can only screw in big thread groove from the minor thread tooth among the threaded connection, the access screw thread must be greater than the export screw thread, and the thread size unit is um, and then the change law of thread width and degree of depth is:
where D is the length of the internal thread, L represents the distance of the cutting point from the end of the thread, L (D-L) represents the width of the thread at a distance D-L from the point of threading, r1Denotes the radius of the pipe, phi1The rotation angle of the screw thread of the ore-raising pipe is shown, namely the angle between the radial direction of the ore-raising pipe and the tangential direction of the screw thread; h represents the thread depth, and h (D-L) represents the thread depth at a distance D-L from the point of threading;
setting the feed rate in the process of processing the internal thread, the cutting depth and the rotating speed of the poplar pipe joint to be respectively fz，ap(ii) a Because the cutting edge of the blade is completely consistent with the cross section shape of the internal thread and is reduced in proportion, the cross section shape of the whole internal thread can be controlled only by controlling the cutting depth;
after error compensation, when processing the internal thread with variable groove width and variable depth, the feed amount of the cutter and the cutting depth are as follows:
Az(D-l)＝ap+ψ(l)
Fz(D-L) represents a feed amount of a distance D-L from a machining distance to a thread-insertion point, [ phi ] represents an error in the x-direction, [ omega ] represents an error in the y-direction, and Az(D-L) represents the depth of cut at a distance D-L from the point of threading, apIndicates the cutting depth before error compensation, and ψ (l) indicates the z-direction error;
arranging N blades on the cutter head, driving the cutter head to rotate by the motor, and if the rotating speed is r revolutions per minute, driving the cutter head to rotate to cut by the high machine, wherein the excitation frequency is
The diameter of the cutter head is d, the cutting speed is
The amplitude of the ultrasonic vibration is B, the frequency is the resonant frequency f of the cutter vibration, the maximum vibration speed v is 2 pi fB, and in order to ensure the effective processing, the cutting speed is lower than the ultrasonic vibration speed, namely
Wherein R is the radius of the pipe joint of the ore raising pipe;
after obtaining the mounted poplar pipe joint through modal testing, the natural frequency of the machine tool at the end of the ore-raising pipe joint is omega1The natural frequency of the machine tool at the cutter head is omega2Then the excitation frequency cannot approach the natural frequency, i.e.:
(
or
) And (a)
Or
)
And obtaining the excitation frequency meeting the conditions as the excitation frequency of the ultrasonic vibration device (1) to finish the processing of the internal thread.
In a further improvement, f is 20000 in Hz.
In a further development, the number N of matched blades and the rotational speed r are selected as a function of the determined suitable excitation frequency in step 5. For example, if the excitation frequency is K, 10000Hz, Nr ═ 60K, and the maximum motor speed is 5000 rpm, the speed may be 2000, and the number of blades may be 5
In a further development, the number N of matched blades and the rotational speed r are selected as a function of the determined suitable excitation frequency in step 5. For example, if the excitation frequency is K, 10000Hz, Nr is 60K, and the maximum motor speed is 5000 rpm, the motor speed may be 2000, and the number of blades may be 5.
Compared with the prior art, the high-efficiency processing device for the internal thread of the deep-sea ore-raising pipe joint provided by the invention has the following advantages:
the invention provides the efficient machining device and method capable of realizing the special internal threads on the common lathe, so that the machining precision and efficiency of the external threads are improved, and the service performance of the ore-raising pipe connecting piece is improved.
[ description of the drawings ]
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention to its proper form. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic view of a deep-sea ore-lifting pipe thread processing device.
It should be noted that the drawings and the description are not intended to limit the scope of the inventive concept in any way, but to illustrate it by a person skilled in the art with reference to specific embodiments.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention provides a device for efficiently processing special connection external threads of a deep-sea ore-raising pipe and a using method thereof. The invention can effectively improve the processing efficiency and precision of the deep-sea pipe raising joint. As shown in fig. 1.
The ultrasonic vibration device is arranged on the machine tool, the tail end of a vibration amplitude transformer in the ultrasonic vibration device outputs ultrasonic vibration, and a driving device on the machine tool drives the ore-raising pipe to rotate at a high speed and adjusts the distance between the ore-raising pipe and the blade. The ultrasonic vibration device is connected with the connecting piece through the fastening bolt, the connecting piece is closely connected with the supporting piece through the bolt, the connecting piece is additionally arranged at the vibration output end of the ultrasonic vibration amplitude transformer, the connecting piece is used for preventing the vibration amplitude transformer from being damaged by direct impact force due to the fact that the vibration amplitude transformer is directly connected with the supporting piece to transmit vibration, and the connecting piece is a high manganese steel gasket and is a replaceable piece.
The ultrasonic vibration device generates ultrasonic vibration in the x direction and mainly comprises an ultrasonic vibration amplitude transformer, a piezoelectric exciter, an ultrasonic power supply, a connecting piece with a special structure, a blade with a special structure and a gasket. The connecting piece and the ultrasonic amplitude transformer are connected with the supporting piece through fastening bolts
Measuring the error influence quantity of the machine tool, and testing the position difference of the front and back of the mounting axle, the clamp and the ultrasonic vibration device through a sensor to obtain the error influence quantity of the machine tool for mounting the axle.
The actual position between the tool and the workpiece is detected by a pair of sensors in a non-contact manner, one sensor is arranged on the workbench, and the other sensor is arranged in the center of the tool and used for detecting the relative position of the workpiece and the center of the tool; measuring the relative x, y and z positions of the front cutter and the workpiece for mounting the ultrasonic device and the poplar pipe joint and the deflection angles of the driving pipe joint of the machine tool in the plane x-y, y-z and x-z respectively as x1，y1，z1，α1，β1，γ1. After the ultrasonic device and the poplar pipe joint are installed on the machine tool, the relative x, y and z positions of the cutter and the workpiece and the deflection angles of the machine tool driving device driving the pipe joint in the planes x-y, y-z and x-z are respectively x2，y2，z2，α2，β2，γ2(ii) a The amount of error influence obtained is
Δx＝x2-x1
Δy＝y2-y1
Δz＝z2-z1
Δα＝α2-α1
Δβ＝β2-β1
Δγ＝γ2-γ1
Wherein Δ x is the x-direction displacement error;
Δ y is the y-direction displacement error;
Δ z is the displacement error in the z direction;
delta alpha is the angle error of the deflection motion of the machine tool main shaft in the x-y plane;
delta beta is the angle error of the deflection motion of the machine tool main shaft in the y-z plane;
delta gamma is the angle error of the deflection motion of the machine tool main shaft in the x-z plane;
the deflection error decreases gradually along the pipe joint end toward the drive unit clamping location, and the errors along the pipe joint axial length in the x, y, z directions are respectively:
φ(l)＝Δx+ltanα
ω(l)＝Δy+ltanβ
ψ(l)＝Δz+ltanγ
where l is the distance from the axis of the clamp.
Since the thread is of variable groove width and depth, the variation process follows a linear law along the length of the thread. The width of the access thread of one section of the thread is set to be L1, the depth of the access thread is set to be h1, the width of the thread of the outlet is set to be L2, and the depth of the outlet is set to be h 2. Since only small thread turns can be screwed into large thread grooves in a threaded connection, the access thread must be larger than the outlet thread. The thread size unit is um, then the change rule of thread width does:
where D is the length of the entire thread.
The feed (tool control) for machining the standard thread (fixed width and depth, with maximum depth of cut and width values) is set to f, the depth of cut (tool control) and the rotational speed (rotational speed of the tube structure) are set to fz，apAnd n, because the cutting edge of the cutter is completely consistent with the section of the special connecting thread and is reduced in proportion, the section shape of the whole special thread can be controlled only by controlling the cutting depth.
After error compensation, the feeding amount of the cutter with special variable groove width and variable depth is processed, and the cutting depth is as follows:
Az(D-l)＝ap+ψ(l)
because the thread is variable in groove width and depth, the change process of the thread follows a linear law.
N blades are arranged on the cutter head, the driving motor drives the cutter head to rotate at a high speed r (revolutions per minute), and then the high-speed motor drives the cutter head to rotateRotary cutting with an excitation frequency of
The diameter of the cutter head is d, the cutting speed is
The amplitude of the ultrasonic vibration is B, the frequency is the resonant frequency f of the cutter vibration, about 20000, the unit is Hz, the maximum vibration speed v is 2 pi fB, and in order to ensure the effective processing, the cutting speed is lower than the ultrasonic vibration speed. Namely, it is
Wherein R is the radius of the pipe joint of the ore-raising pipe.
After obtaining the mounted poplar pipe joint through modal testing, the natural frequency of the machine tool at the end of the ore-raising pipe joint is omega1The natural frequency of the machine tool at the cutter head is omega2Then the excitation frequency cannot approach the natural frequency, i.e.:
(
or
) And (a)
Or
)
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any simple modification, equivalent change and modification made by those skilled in the art according to the technical spirit of the present invention without departing from the technical scope of the present invention are all within the scope of the present invention.
Claims (5)
1. The efficient machining device for the internal thread of the deep sea ore raising pipe joint is characterized by comprising an ultrasonic vibration device (1) installed on a machine tool, wherein the ultrasonic vibration device (1) is connected with a first connecting piece (2) through a fastening bolt, the first connecting piece (2) is tightly connected with a cylindrical supporting piece (3) through a bolt, a motor (4) is installed in the supporting piece (3), the motor (4) is connected with a cutter head (5) through a transmission shaft (9), and the cutter head (5) is connected with a cutter blade (6); the motor (4) is fixedly connected with the supporting piece (3) through a second connecting piece (7), and the cutter head (5) is fixedly connected with the supporting piece (3) through a third connecting piece (8).
2. The high-efficiency machining device for the internal thread of the deep sea winnowing pipe joint according to claim 1, characterized in that the first connecting piece (2) is a high manganese steel gasket; the second connecting piece (7) and the third connecting piece (8) are both connecting rods.
3. The high-efficiency machining device for the internal thread of the deep sea lifting pipe joint according to claim 1, characterized in that non-contact sensors are installed at the centers of a workbench and a cutter head (5) of the machine tool, and the two non-contact sensors form a pair of non-contact sensors to detect the relative positions of a workpiece and the center of the cutter.
4. The use method of the high-efficiency machining device for the internal thread of the deep sea ore raising pipe joint is characterized by comprising the following steps of:
firstly, mounting non-contact sensors at the centers of a workbench and a cutter head (5) of a machine tool, and measuring the relative x, y and z-direction positions of two non-contact sensors before an ultrasonic device and a poplar pipe joint are mounted on the machine tool; then the machine tool driving device drives the machine tool spindle to move and deflect for a preset distance, and the deflection angle alpha in the plane x-y, y-z and x-z1，β1，γ1The displacement of the machine tool main shaft along the x, y and z axes under the x-y-z coordinate system is x respectively1，y1，z1；
Secondly, the ultrasonic vibration device (1) and the poplar pipe joint (10) are installed on the machine tool, and the cutter and the workbench are measuredThen the machine tool driving device drives the machine tool spindle to move and deflect for a preset distance, and the deflection angles in the planes x-y, y-z and x-z are respectively alpha2，β2，γ2The displacement of the machine tool spindle along the x, y and z axes under the x-y-z coordinate system is x respectively2，y2，z2；
Step three, obtaining the error influence quantity of the machine tool after the ultrasonic vibration device (1) and the poplar pipe joint are installed:
Δx＝x2-x1
Δy＝y2-y1
Δz＝z2-z1
Δα＝α2-α1
Δβ＝β2-β1
Δγ＝γ2-γ1
wherein, Δ x is the displacement error of the machine tool spindle in the x-axis direction; delta y is the displacement error of the machine tool spindle in the y-axis direction; delta z is the displacement error of the machine tool spindle in the z-axis direction; delta alpha is the angle error of the deflection motion of the machine tool main shaft in the x-y plane; delta beta is the angle error of the deflection motion of the machine tool main shaft in the y-z plane; delta gamma is the angle error of the deflection motion of the machine tool main shaft in the x-z plane;
the deflection error gradually decreases from the end of the poplar pipe joint to the clamping position of the driving device, and the errors in the x, y and z directions along the length of the pipe joint axis are respectively as follows:
φ(l)＝Δx+l tanΔα
ω(l)＝Δy+l tanΔβ
ψ(l)＝Δz+l tanΔγ
wherein l is the axial distance between the poplar pipe joint and the clamping position; phi (l), omega (l) and psi (l) respectively represent the errors in the directions of an x axis, a y axis and a z axis at the position where the distance is l from the tail end of the pipe joint of the ore raising pipe; the delta x, the delta y and the delta z are respectively displacement errors of the poplar pipe joint in the directions of an x axis, a y axis and a z axis away from the clamping position;
step four, because the internal thread of the poplar pipe joint is variable in groove width and depth, the change process follows the linear rule along the length of the thread, and the setting is carried outThe width of the access thread of the internal thread is L1Depth of h1Outlet thread width of L2Depth of h2(ii) a Because can only screw in big thread groove from the minor thread tooth among the threaded connection, the access screw thread must be greater than the export screw thread, and the thread size unit is um, and then the change law of thread width and degree of depth is:
where D is the length of the internal thread, L represents the distance of the cutting point from the end of the thread, L (D-L) represents the width of the thread at a distance D-L from the point of threading, r1Denotes the radius of the pipe, phi1The rotation angle of the screw thread of the ore-raising pipe is shown, namely the angle between the radial direction of the ore-raising pipe and the tangential direction of the screw thread; h represents the thread depth, and h (D-L) represents the thread depth at a distance D-L from the point of threading;
setting the feed rate in the process of processing the internal thread, the cutting depth and the rotating speed of the poplar pipe joint to be respectively fz，ap(ii) a Because the cutting edge of the blade is completely consistent with the cross section shape of the internal thread and is reduced in proportion, the cross section shape of the whole internal thread can be controlled only by controlling the cutting depth;
after error compensation, when processing the internal thread with variable groove width and variable depth, the feed amount of the cutter and the cutting depth are as follows:
Az(D-l)＝ap+ψ(l)
Fz(D-L) represents a feed amount of a distance D-L from a machining distance to a thread-insertion point, [ phi ] represents an error in the x-direction, [ omega ] represents an error in the y-direction, and Az(D-l) represents a working distanceDepth of cut a distance D-L from the point of threadingpIndicates the cutting depth before error compensation, and ψ (l) indicates the z-direction error;
arranging N blades on the cutter head, driving the cutter head to rotate by the motor, and if the rotating speed is r revolutions per minute, driving the cutter head to rotate to cut by the high machine, wherein the excitation frequency is
The diameter of the cutter head is d, the cutting speed is
The amplitude of the ultrasonic vibration is B, the frequency is the resonant frequency f of the cutter vibration, the maximum vibration speed v is 2 pi fB, and in order to ensure the effective processing, the cutting speed is lower than the ultrasonic vibration speed, namely
Wherein R is the radius of the pipe joint of the ore raising pipe;
after obtaining the mounted poplar pipe joint through modal testing, the natural frequency of the machine tool at the end of the ore-raising pipe joint is omega1The natural frequency of the machine tool at the cutter head is omega2Then the excitation frequency cannot approach the natural frequency, i.e.:
And obtaining the excitation frequency meeting the conditions as the excitation frequency of the ultrasonic vibration device (1) to finish the processing of the internal thread.
5. The use method of the high efficiency deep sea winnowing pipe joint internal thread processing device according to claim 4, wherein f is 20000 in Hz.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113843459A (en) * | 2021-10-25 | 2021-12-28 | 湖南工学院 | Device for efficient and precise ultrasonic grinding machining of ore-raising pipe threads and using method thereof |
| CN113941905A (en) * | 2021-10-25 | 2022-01-18 | 湖南工学院 | Error and path compensation method for efficient and precise machining of ore-raising pipeline |
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