CN108907323B - Pipe fitting cutting method - Google Patents
Pipe fitting cutting method Download PDFInfo
- Publication number
- CN108907323B CN108907323B CN201810891436.2A CN201810891436A CN108907323B CN 108907323 B CN108907323 B CN 108907323B CN 201810891436 A CN201810891436 A CN 201810891436A CN 108907323 B CN108907323 B CN 108907323B
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- CN
- China
- Prior art keywords
- pipe fitting
- cutting
- acquiring
- cutter
- servo motor
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D21/00—Machines or devices for shearing or cutting tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D33/00—Accessories for shearing machines or shearing devices
- B23D33/02—Arrangements for holding, guiding, and/or feeding work during the operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
- B23D36/00—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut
- B23D36/0008—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut for machines with only one cutting, sawing, or shearing devices
- B23D36/0033—Control arrangements specially adapted for machines for shearing or similar cutting, or for sawing, stock which the latter is travelling otherwise than in the direction of the cut for machines with only one cutting, sawing, or shearing devices for obtaining pieces of a predetermined length
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Sawing (AREA)
Abstract
The invention discloses a pipe fitting cutting method, which comprises the steps of presetting cutting length; acquiring the movement speed of the pipe fitting; acquiring a rotating speed curve of the cutter rotating for one circle; when the arc length of the movement of the cutter is equal to the preset cutting length, the contact point of the cutter and the pipe fitting is a cutting point; the cutting knife cuts the pipe fitting. The cutting machine can cut the pipe fitting at a fixed length in the conveying process of the pipe fitting, and improves the production efficiency.
Description
Technical Field
The invention relates to a pipe cutting method.
Background
In the prior art, the pipe conveying is performed in a working mode of stopping conveying and then cutting off, namely, the conveying length of the pipe is preset, and when the conveying length of the pipe is equal to the preset length, the pipe is cut in a conveying pause mode. The efficiency of processing the pipe by using the cutting mode is low, and particularly when the preset cutting length of the pipe is short, the production efficiency is reduced by frequent starting and stopping.
Disclosure of Invention
The invention aims to provide a pipe cutting method, which can cut pipes at a fixed length in the pipe conveying process and improve the production efficiency.
In order to solve the technical problem, the invention provides a pipe cutting method, which comprises the following steps: presetting a cutting length; acquiring the movement speed of the pipe fitting; acquiring a rotating speed curve of the cutter rotating for one circle; when the arc length of the movement of the cutter is equal to the preset cutting length, the contact point of the cutter and the pipe fitting is a cutting point; the cutting knife cuts the pipe fitting.
Further, acquiring the movement speed of the pipe, comprising: acquiring the transmission ratio of a transmission pair for driving the pipe fitting to move; acquiring the number of pulses of a motor driving a transmission pair to move, and acquiring the angular displacement of the motor according to the number of the pulses; and acquiring the movement speed of the pipe fitting according to the transmission ratio of the transmission pair and the angular displacement of the motor.
Further, the motor is a servo motor or a stepping motor.
Further, acquiring a rotation curve of the cutter includes: acquiring a rotating speed curve of a servo motor for driving the cutter to rotate; acquiring the number of pulses of a motor driving a transmission pair to move, and acquiring the angular displacement of the motor according to the number of the pulses; and acquiring the number of pulses of the servo motor rotating for one circle.
Further, the area of one rotation of the servo motor is composed of a cutting area and a matching area, and the length of the matching area is equal to the preset cutting length.
Further, the rotating speed of the servo motor in the matching area is matched with the moving speed of the pipe fitting.
The invention has the beneficial effects that:
1. the pipe fitting is cut in the pipe fitting conveying process, so that the time for starting and suspending the conveying is reduced, and the production efficiency is improved;
2. the rotating speed curve of the cutter is adjusted according to the moving speed of the pipe fitting, so that the fixed-length cutting of the pipe fitting can be realized, and the use of an operator is facilitated.
Drawings
Fig. 1 is a flow chart of a pipe cutting method.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Examples
The embodiment of the invention discloses a pipe fitting cutting method, which comprises the following steps as shown in figure 1:
step S1: the length of the pipe cut is first preset.
Step S2: and acquiring the movement speed of the pipe fitting along the axial direction of the pipe fitting.
The belt transmission is generally adopted in the transportation of the pipe fittings, the movement speed of the pipe fittings or the rotation speed of the belt is difficult to measure by directly utilizing the sensor, and the error of the measuring result is larger. The tube movement speed is thus obtained in the following way:
step S21: the transmission ratio of the belt drive driving the pipe to be conveyed forward is obtained and is generally not changed during the cutting process of the pipe.
Step S22: and acquiring the number of pulses of a motor for driving a driving wheel in the belt transmission to rotate. In order to improve the accuracy of the measurement result of the movement speed of the pipe fitting, a servo motor or a stepping motor is selected as a motor for driving the driving wheel to rotate.
According to the performance of the servo motor, the actual working condition of the servo motor is adjusted to the working condition of speed control according to the actual control requirement. The servo mainly relies on the pulse to realize the location, and servo motor receives 1 pulse, will rotate the angle that a pulse corresponds to realize the displacement. Therefore, the rotating step angle of the servo motor can be correspondingly obtained by acquiring the number of the pulses of the servo motor. It is generally related to the maximum speed of movement of the end station, the transmission ratio of the connection between the servo motor and the station, the amount of displacement of the end of each revolution of the end drive, the encoder resolution of the servo motor, the maximum rotational speed of the servo motor and the maximum output pulse pl of the PLC controller, and such related calculations are well known.
From the transmission ratio of the belt transmission pair and the rotation speed of the servo motor obtained above, the rotation speed of the belt, that is, the rotation speed of the pulley, i.e., the motor rotation speed/transmission ratio, and further, the linear speed of the belt, i.e., the rotation speed of the pulley, x the diameter of the pulley, x 3.14/60, can be estimated. Because the tube is being conveyed by the belt, the linear velocity of the tube motion is the linear velocity of the belt.
Step S3: and obtaining a rotating speed curve when the cutter rotates for one circle.
Because the cutter is driven to rotate by the servo motor fixed with the cutter, the rotating speed curve of one circle of rotation of the cutter corresponds to the rotating speed curve of one circle of rotation of the servo motor. The track moved by the servo motor rotating for one circle is composed of a cutting area and a matching area. The cutting area is a rotating speed curve corresponding to the servo motor in the process of cutting the pipe fitting by the cutting cutter, the matching area is a rotating speed curve corresponding to the servo motor when the pipe fitting is conveyed forwards, and the pipe fitting is not cut by the cutting cutter.
The pipe fitting conveying device has the advantages that the pipe fitting is cut in the pipe fitting conveying process, namely the pipe fitting is required to be cut, and the forward moving speed of the pipe fitting is kept unchanged. Therefore, the servo motor moves at a lower rotating speed in the process of forward conveying the pipe fitting, namely the servo motor is located in the matching area, the length of the matching area is equal to the preset length of the pipe fitting, and the arc length of the cutter moving in the matching area is equal to the preset length of the pipe fitting. The rotating speed of the cutter when the servo motor is in the matching area has a certain relation with the conveying speed of the pipe fitting and the preset length of the pipe fitting, and the pipe fitting moves at a constant speed in the pipe fitting conveying process. The distance from the cutting portion of the knife to the center of the connection with the servo motor is recorded as the radius R of the knife, and the average angular velocity of the knife in the matching area is 2 × 3.14 × R/[ (the preset length of the tube/the movement velocity of the tube) × 360 °).
Step S4: when the arc length of the movement of the cutter is equal to the preset cutting length, the contact point of the cutter and the pipe fitting is a cutting point; the cutting knife cuts the pipe fitting.
According to the preset cutting length calculation of the pipe fitting and the movement speed of the pipe fitting, the time required for the cutting point of the pipe fitting to move to the position of the cutter can be calculated, and then the number of pulses of the servo motor for driving the driving wheel to rotate is adjusted according to the movement speed and the time of the pipe fitting and the type of the servo motor.
During the forward conveying of the pipe fitting, the cutter rotates synchronously in the matching area. When the number of pulses received by the servo motor for driving the driving wheel to rotate is equal to the preset number of pulses, the cutting point is positioned below the cutter. The cutting knife is in contact with the pipe, and the cutting knife is located in the cutting area. In order to realize that the conveying length of the pipe fitting in the cutting area can be ignored and improve the flatness of the notch and the verticality of the end face, the rotation of the cutter in the cutting area is far greater than the conveying speed of the pipe fitting. When the pipe fitting is cut off by the cutter, the cutter is separated from the pipe fitting, and the movement speed of the cutter is adjusted to the movement speed in the matching area from the movement speed in the cutting area. Since the setting and adjustment of the speed profile of the servo motor is common knowledge in the art, a person skilled in the art will be able to implement the setting of the speed profile according to the specific parameters given above.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (2)
1. A pipe cutting method, comprising:
presetting a cutting length;
acquiring the movement speed of the pipe fitting; obtaining the tubular movement velocity, comprising: acquiring the transmission ratio of a transmission pair for driving the pipe fitting to move; acquiring the number of pulses of a motor driving a transmission pair to move, and acquiring the angular displacement of the motor according to the number of the pulses; acquiring the movement speed of the pipe fitting according to the transmission ratio of the transmission pair and the angular displacement of the motor;
acquiring a rotating speed curve of the cutter rotating for one circle; acquiring a rotating speed curve of the cutter, including acquiring a rotating speed curve of a servo motor driving the cutter to rotate; acquiring the number of pulses of one circle of rotation of the servo motor; the servo motor rotates for one circle, and the servo motor is arranged in the pipe fitting and comprises a cutting area and a matching area, wherein in the matching area, the movement length of the cutter along the axial direction of the pipe fitting is equal to the preset cutting length; the rotating speed of the servo motor in the matching area is matched with the moving speed of the pipe fitting; the transmission pair comprises a belt pulley and a belt, the linear speed of the movement of the pipe fitting is equal to the linear speed of the belt, the rotating speed of the belt pulley = the rotating speed of the motor/transmission ratio, and the linear speed of the belt = (the rotating speed of the belt pulley is multiplied by the diameter of the belt pulley is multiplied by 3.14)/60;
when the movement length of the cutter along the axial direction of the pipe fitting is equal to the preset cutting length, the contact point of the cutter and the pipe fitting is a cutting point; the cutting knife cuts the pipe fitting.
2. The pipe cutting method of claim 1, wherein the motor for driving the transmission pair is a servo motor or a stepping motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810891436.2A CN108907323B (en) | 2018-08-07 | 2018-08-07 | Pipe fitting cutting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810891436.2A CN108907323B (en) | 2018-08-07 | 2018-08-07 | Pipe fitting cutting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108907323A CN108907323A (en) | 2018-11-30 |
| CN108907323B true CN108907323B (en) | 2020-08-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810891436.2A Active CN108907323B (en) | 2018-08-07 | 2018-08-07 | Pipe fitting cutting method |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5224368A (en) * | 1992-04-03 | 1993-07-06 | Schach Herbert U | Flying die machine |
| JP5905320B2 (en) * | 2012-04-16 | 2016-04-20 | 東芝機械株式会社 | Grooving method and mirror surface processing method for film workpiece by fly cut |
| CN104625214B (en) * | 2013-11-08 | 2017-07-07 | 北京二十一世纪科技发展有限公司 | The control method of fly cutter cutting machine, control device and fly cutter cutting machine system |
| CN104552420A (en) * | 2015-01-23 | 2015-04-29 | 苏州惠斯福自动化科技有限公司 | Conveying unit for corrugated pipe cut-off machine |
| CN106424916A (en) * | 2016-12-08 | 2017-02-22 | 大连三高集团有限公司 | Automatic control system and automatic control method for flying saw machine |
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- 2018-08-07 CN CN201810891436.2A patent/CN108907323B/en active Active
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| CN108907323A (en) | 2018-11-30 |
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