CN110567423A - Large-pitch conical internal thread detection device and method - Google Patents

Large-pitch conical internal thread detection device and method Download PDF

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Publication number
CN110567423A
CN110567423A CN201910789402.7A CN201910789402A CN110567423A CN 110567423 A CN110567423 A CN 110567423A CN 201910789402 A CN201910789402 A CN 201910789402A CN 110567423 A CN110567423 A CN 110567423A
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thread
detection
pitch
workpiece
component
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CN201910789402.7A
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CN110567423B (en
Inventor
董萌萌
周春
许翠华
黄煌
田宏杰
牟培英
朱宁
吴智峰
王渤
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Xian Research Institute Co Ltd of CCTEG
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Xian Research Institute Co Ltd of CCTEG
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/08—Measuring arrangements characterised by the use of optical techniques for measuring diameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/10—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring diameters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
    • G01B21/22—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring angles or tapers; for testing the alignment of axes

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

The invention discloses a large-pitch conical internal thread detection device and a method. The calculation assembly is connected with the thread detection platform through an information acquisition transmission line and comprises a display interface, a data storage system and a parameter calculation method module. Specifically, the thread detection component measures the opening distance and the longitudinal change height of the thread gauge at different thread sections for three times, transmits measurement data to the calculation component, and the calculation component processes and calculates the measurement data to obtain the thread taper, the specified point thread pitch diameter and the thread pitch, judges the machining result and records the detection result in the data storage system. The large-pitch conical internal thread detection device is simple in structure, few in thread detection points, small in abrasion to a thread gauge, high in detection efficiency and capable of meeting the requirement of an automatic production line on thread detection.

Description

Large-pitch conical internal thread detection device and method
Technical Field
The invention belongs to the technical field of thread detection, and particularly relates to a large-pitch conical internal thread detection device and method.
background
The conical thread has tight connection due to the thread pair, good sealing performance and thicker thread pipe wall, has stronger torque transmission capacity and pressure resistance, and is widely applied to high-pressure gas and liquid transmission pipelines and high-strength drilling tools. In the process of processing the conical thread, thread detection is an important link for ensuring the processing quality of the thread. The conical external thread has mature detection technology due to the fact that the thread part of the conical external thread is easy to observe, and a contact type method or a non-contact type method is adopted. The internal thread of the cone has smaller internal space and gradually changes due to the inner side of the thread, and the contact type detection common thread gauge, the needle type detector and the like are used for detecting the internal thread. When using the screw thread rule to detect, need to revolve the screw thread rule screw in repeatedly and screw out, detection efficiency is low and the measuring tool easily wears out, is difficult to satisfy big batch, short-term test's demand. When the needle type instrument is used for detection, only a single parameter can be detected at a time, and the detection efficiency is low.
The non-contact internal thread detection method comprises the modes of visual imaging, laser scanning, three-dimensional curved surface forming and the like. When detecting medium diameter internal thread, because the inner space is limited, when adopting visual imaging detection, to the imaging camera lens higher requirement, conventional camera lens can't go deep into the work piece inboard. In addition, when the visual imaging method is adopted, the lens is close to the thread and is irradiated by light, the fisheye distortion phenomenon is serious, the image is easy to distort, and the measurement accuracy is poor. When the laser is adopted for scanning the surface, a large amount of data needs to be acquired, the single-point scanning detection time is long, and the method is not ideal in the aspects of rapid processing and automatic integration. When the three-dimensional curved surface forming method is adopted, special equipment is needed, the cost is high, and large-scale popularization and application are difficult.
at present, no mature, quick and accurate detection technology and method exist for detecting the medium-diameter conical internal thread with the size of phi 40 mm-phi 120 mm.
Disclosure of Invention
the invention provides a device and a method for detecting a large-pitch conical internal thread, in particular to a device and a method for detecting a medium-diameter large-pitch conical internal thread, aiming at the defects and shortcomings in the prior art, and realizing the quick and efficient detection of the internal thread.
In order to achieve the purpose, the invention adopts the following technical scheme:
a large-pitch conical internal thread detection device comprises a workpiece fixing component, a thread measuring component, a detection mechanism, a lifting component, a horizontal connecting component and a parameter calculating component;
the workpiece fixing assembly, the thread measuring assembly, the detection mechanism, the lifting assembly and the horizontal connecting assembly form a thread detection platform together;
The workpiece fixing assembly comprises a fixing platform and a paw which is arranged on the fixing platform and can be automatically clamped, and is used for clamping and fixing the workpiece to be detected and adjusting the height; the lifting assembly comprises a linear guide rail and a servo motor which are vertically arranged on the fixed platform and is used for driving the thread measuring assembly and the detection mechanism to move up and down along the longitudinal direction according to the detection requirement;
The linear guide rail is connected with a horizontal connecting assembly, and the horizontal connecting assembly comprises a ball screw and a horizontal cross rod parallel to the fixed platform; the servo motor can drive the ball screw to drive the horizontal cross rod to move up and down along the linear guide rail, the end part of the horizontal cross rod is connected with the detection mechanism, the lower end of the detection mechanism is connected with the thread measuring assembly, and the thread measuring assembly is located right above the gripper.
the invention also comprises the following technical characteristics:
The thread measuring assembly comprises a cylindrical base, the top of the base is connected with the detection mechanism, and three moving guide rails along the radial direction of the base are arranged at the bottom of the base;
A precise servo driving device is arranged in the base and controls the three moving guide rails to move along the radial direction of the base; the included angle of the adjacent moving guide rails is 120 degrees, and each moving guide rail is provided with a standard thread gauge; one of the movable guide rails is fixedly provided with a displacement sensor for measuring the distance of the movable guide rail driving the standard thread gauge to move, and the tail end of each movable guide rail is provided with a pretightening force measuring sensor for measuring the pretightening force of the standard thread gauge after being contacted with a workpiece to be detected; the bottom of the base is also provided with a laser ranging sensor for measuring the distance between the base and the end face of the workpiece to be detected;
the detection mechanism comprises a connector, the top end of the connector is connected with the horizontal connecting assembly, the lower end of the connector is connected with the base of the thread measuring assembly, and a signal acquisition and conversion circuit module of the thread measuring assembly is arranged in the connector;
The parameter calculation assembly comprises a display interface, a data storage system and a parameter calculation module and is used for setting parameters, judging whether machining parameters are qualified or not, displaying a thread detection calculation result and storing detection data.
The invention also provides a detection method using the coarse-pitch conical internal thread detection device, which comprises the following steps:
Step 1: inputting design parameters of the thread of the workpiece to be measured in a parameter calculation component display interface, wherein the design parameters of the thread comprise pitch diameter, pitch and taper of the thread;
Step 2: placing a workpiece to be detected in a workpiece fixing assembly, and adjusting the workpiece fixing assembly to a proper height;
And step 3: the thread measuring assembly descends and goes deep into the threaded hole, the thread gauge is opened and matched with the internal thread, and when the opening force reaches the set pretightening force, the screw is screwedthe pattern gauge stops acting, and the workpiece fixing assembly clamps the workpiece; at this time, the displacement sensor measures the opening distance l of the screw gauge1the distance h between the laser sensor and the end face of the thread is measured by the laser sensor1Obtaining a first set of data (l)1,h1)；
And 4, step 4: the thread gauge is retracted, and the thread measuring assembly is raised to H1 height, wherein H1 is N1S, N1 is the designated number of thread rings, and S is the design thread pitch; after the screw gauge is stretched again and reaches the set pretightening force, measuring the stretching distance l of the screw gauge2Distance h between laser sensor and end face of thread2Obtaining a second set of data (l)2,h2)；
And 5: the screw gauge is retracted again and raised to H2 height, wherein H2 is N2 · S, N2 is the designated number of rings, and S is the design pitch; repeating the operation of step S4 to obtain a third set of data (l)3,h3)；
step 6: calling a parameter calculation module of the parameter calculation component, calculating main thread machining parameters and judging whether thread machining is qualified or not;
And 7: and judging whether the thread machining is qualified or not according to the detection result, storing the detection result in a data storage system, and giving an action instruction to the workpiece sorting mechanism and the thread machining equipment according to the judgment result.
the step 6 comprises the following steps:
Step 6-1: to (l)1,h1) As the origin, the axial direction of the workpiece is the Y axis, and the transverse direction is the X axis, a two-dimensional coordinate system is established, and two points X in the relative coordinate system are obtained1(δl2/2，δh2)，X2(δl3/2，δh3) Wherein:
δh2＝h2-h1，δh3＝h3-h1
δl2＝l2-l1，δl3＝l3-l1
step 6-2: according to X in step 6-11、X2two points coordinate values, the slope k of a straight line passing through the two points is calculated, and the thread taper is calculatedThe degree α, then:
k＝2(δh2-δh3)/(δl2-δl3)
α＝90°-arctan(k)
Comparing the calculated taper alpha with the designed taper beta, and if the calculated taper alpha is within the tolerance range, processing the thread taper to be qualified;
Step 6-3: calculating the actual machining thread pitch by the actual rising distance and the number of the thread rings, and then:
S1＝δh2/N1
S2＝δh3/(N1+N2)
comparing S1 and S2 with the designed thread pitch S, and if the distance is within the tolerance range, processing the thread pitch to be qualified;
Step 6-4: calculating X1、X2the radius length of the theoretical pitch diameter of the thread at the point is as follows:
l2-1＝δh2·tan(β)+l1
l3-1＝δh3·tan(β)+l1
the theoretical design value l2-1、l3-1and the actual measured value l2、l3And comparing, and if the difference is within the tolerance range, the pitch diameter of the thread is qualified.
Compared with the prior art, the invention has the beneficial technical effects that:
the large-pitch conical internal thread detection device disclosed by the invention has the advantages of simple structure, few thread detection points, small abrasion to the thread gauge and high detection efficiency, and can meet the requirement of an automatic production line on thread detection.
(II) the large-pitch conical internal thread detection device can realize detection of conical internal threads of different specifications only by replacing different thread detection gauges, and is good in flexibility.
(III) the thread measuring assembly can be used for processing and detecting large-pitch conical internal threads and large-pitch parallel internal threads, the thread gauge can be customized according to the diameter of a detected workpiece, the detection of internal threads with medium diameters of phi 40 mm-phi 120mm and even internal threads with larger diameters can be met, and the thread measuring assembly has good expansibility.
Drawings
FIG. 1 is a schematic view of the internal thread detection device of the present invention;
FIG. 2 is a schematic illustration of the internal thread detection of the present invention;
FIG. 3 is a schematic illustration of laser measured distance of the present invention;
FIG. 4 is a schematic view of the mounting of the sensors on the base of the measurement assembly of the present invention;
FIG. 5 is a schematic view of the detection device for measuring the opening distance and the pre-tightening force.
The reference numerals in the figures denote: 1-a workpiece fixing component, 2-a workpiece to be detected, 3-a thread measuring component, 4-a detecting mechanism, 5-a lifting component, 6-a horizontal connecting component, 7-a parameter calculating component, 8-a thread detecting platform, 9-a thread gauge, 10-a laser sensor, 11-a pretightening force sensor, 12-a displacement sensor, 13-a measuring component base, 14-a movable guide rail and 15-internal threads.
Detailed Description
the following embodiments of the present invention are provided, and it should be noted that the present invention is not limited to the following embodiments, and all equivalent changes based on the technical solutions of the present invention are within the protection scope of the present invention.
example 1:
as shown in fig. 1, the embodiment provides a coarse pitch conical internal thread detection device, which includes a workpiece fixing component 1, and further includes a thread measuring component 3, a detection mechanism 4, a lifting component 5, a horizontal connection component 6, and a parameter calculating component 7; the workpiece fixing component 1, the thread measuring component 3, the detection mechanism 4, the lifting component 5 and the horizontal connecting component 6 jointly form a thread detection platform 8; the workpiece fixing assembly 1 comprises a fixing platform and a paw which is arranged on the fixing platform and can be automatically clamped, and is used for clamping and fixing the workpiece 2 to be detected and adjusting the height; the lifting assembly 5 comprises a linear guide rail and a servo motor which are vertically arranged on the fixed platform and is used for driving the thread measuring assembly 3 and the detection mechanism 4 to move up and down along the longitudinal direction according to the detection requirement; the linear guide rail is connected with a horizontal connecting assembly 6, and the horizontal connecting assembly 6 comprises a ball screw and a horizontal cross rod parallel to the fixed platform; the servo motor can drive the ball screw to drive the horizontal cross rod to move up and down along the linear guide rail, the end part of the horizontal cross rod is connected with the detection mechanism 4, the lower end of the detection mechanism 4 is connected with the thread measurement component 3, and the thread measurement component 3 is positioned right above the paw.
specifically, the measuring assembly 3 comprises a cylindrical base 13, the top of the base 13 is connected with the detection mechanism 4, and the bottom of the base 13 is provided with three moving guide rails 14 along the radial direction of the base 13; a precise servo driving device is arranged in the base 13 and controls the three moving guide rails 14 to move along the radial direction of the base 13; the included angle of the adjacent moving guide rails 14 is 120 degrees, and each moving guide rail 14 is provided with a standard thread gauge 9; a displacement sensor 12 is fixed on one of the movable guide rails 14 and used for measuring the distance of the movable guide rail 14 driving the standard thread gauge 9 to move, and a pretightening force measuring sensor 11 is arranged at the tail end of each movable guide rail 14 and used for measuring the pretightening force of the standard thread gauge 9 after contacting with the workpiece 2 to be detected; the bottom of the base 13 is also provided with a laser ranging sensor 10 which is used for measuring the distance between the base 13 and the end face of the workpiece 2 to be detected; the detection mechanism 4 comprises a connector, the top end of the connector is connected with the horizontal connecting component 6, the lower end of the connector is connected with the base 13 of the thread measuring component 3, and a signal acquisition and conversion circuit module of the thread measuring component 3 is arranged in the connector; the parameter calculation component 6 comprises a display interface, a data storage system and a parameter calculation module, and is used for setting parameters, judging whether machining parameters are qualified or not, displaying a thread detection calculation result and storing detection data.
the lifting component 5 drives the thread measuring component 3 and the detection mechanism 4 to descend longitudinally, the thread measuring component and the detection mechanism stop after reaching a set height, the thread gauge 9 of the thread measuring component 3 is opened and matched with the internal thread 15, the pretightening force sensor 11 detects that the matched pretightening force reaches a set value, the thread gauge 9 stops opening, the laser sensor 10 measures the distance h between the laser sensor and the end face of the workpiece1the displacement sensor 12 measures the opening distance l of the thread gauge 91(ii) a After the measurement is finished, the thread gauge 9 retracts, the lifting component 5 drives the thread measuring component 3 and the detection mechanism 4 to longitudinally ascend to a designated height, the actions are repeated to measure a second group of data and a third group of data, and the parameter calculating component 7 records the three groups of dataAnd processing the data, judging whether the thread machining is qualified according to the detection result, storing the detection result in a data storage system, and giving an action instruction to the workpiece sorting mechanism and the thread machining equipment according to the judgment result.
Example 2:
As shown in fig. 1 to 4, the present embodiment further provides a detection method of a coarse-pitch conical internal thread detection device, including the following steps:
step 1: inputting design parameters of the thread of the workpiece to be measured in a parameter calculation component display interface, wherein the design parameters of the thread comprise pitch diameter, pitch and taper of the thread;
Step 2: placing a workpiece to be detected in a workpiece fixing assembly, and adjusting the workpiece fixing assembly to a proper height;
And step 3: the thread measuring assembly descends and penetrates into the threaded hole, the thread gauge is opened and matched with the internal thread, when the opening force reaches the set pretightening force, the thread gauge stops acting, and the workpiece fixing assembly clamps the workpiece; at this time, the displacement sensor measures the opening distance l of the screw gauge1the distance h between the laser sensor and the end face of the thread is measured by the laser sensor1Obtaining a first set of data (l)1,h1)；
And 4, step 4: the thread gauge is retracted, and the thread measuring assembly is raised to H1 height, wherein H1 is N1S, N1 is the designated number of thread rings, and S is the design thread pitch; after the screw gauge is stretched again and reaches the set pretightening force, measuring the stretching distance l of the screw gauge2Distance h between laser sensor and end face of thread2obtaining a second set of data (l)2,h2)；
And 5: the screw gauge is retracted again and raised to H2 height, wherein H2 is N2 · S, N2 is the designated number of rings, and S is the design pitch; repeating the operation of step S4 to obtain a third set of data (l)3,h3)；
Step 6: calling a parameter calculation module of the parameter calculation component, calculating main thread machining parameters and judging whether thread machining is qualified or not;
and 7: and judging whether the thread machining is qualified or not according to the detection result, storing the detection result in a data storage system, and giving an action instruction to the workpiece sorting mechanism and the thread machining equipment according to the judgment result.
more specifically, step 6 includes the steps of:
Step 6-1: to (l)1,h1) As the origin, the axial direction of the workpiece is the Y axis, and the transverse direction is the X axis, a two-dimensional coordinate system is established, and two points X in the relative coordinate system are obtained1δl2/2，δh2，X2δl3/2，δh3Wherein:
δh2＝h2-h1，δh3＝h3-h1
δl2＝l2-l1，δl3＝l3-l1
step 6-2: according to X in step 6-11、X2Two points coordinate values, the slope k of a straight line passing through the two points is calculated, and the thread taper alpha is calculated, then:
k＝2(δh2-δh3)/(δl2-δl3)
α＝90°-arctan(k)
Comparing the calculated taper alpha with the designed taper beta, and if the calculated taper alpha is within the tolerance range, processing the thread taper to be qualified;
Step 6-3: calculating the actual machining thread pitch by the actual rising distance and the number of the thread rings, and then:
S1＝δh2/N1
S2＝δh3/N1+N2
comparing S1 and S2 with the designed thread pitch S, and if the distance is within the tolerance range, processing the thread pitch to be qualified;
Step 6-4: calculating X1、X2the radius length of the theoretical pitch diameter of the thread at the point is as follows:
l2-1＝δh2·tan(β)+l1
l3-1＝δh3·tan(β)+l1
the theoretical design value l2-1、l3-1and the actual measured valuel2、l3and comparing, and if the difference is within the tolerance range, the pitch diameter of the thread is qualified.

Claims (4)

1. a large-pitch conical internal thread detection device comprises a workpiece fixing component (1), and is characterized by further comprising a thread measuring component (3), a detection mechanism (4), a lifting component (5), a horizontal connecting component (6) and a parameter calculating component (7);
The workpiece fixing assembly (1) comprises a fixing platform and a paw which is arranged on the fixing platform and can be automatically clamped, and is used for clamping and fixing the workpiece (2) to be detected and adjusting the height; the lifting assembly (5) comprises a linear guide rail and a servo motor which are vertically arranged on the fixed platform and is used for driving the thread measuring assembly (3) and the detection mechanism (4) to move up and down along the longitudinal direction according to the detection requirement;
The linear guide rail is connected with a horizontal connecting assembly (6), and the horizontal connecting assembly (6) comprises a ball screw and a horizontal cross rod parallel to the fixed platform; the servo motor can drive the ball screw to drive the horizontal cross rod to move up and down along the linear guide rail, the end part of the horizontal cross rod is connected with the detection mechanism (4), the lower end of the detection mechanism (4) is connected with the thread measuring component (3), and the thread measuring component (3) is positioned right above the paw.
2. The large-pitch conical internal thread detection device as claimed in claim 1, wherein the thread measuring assembly (3) comprises a cylindrical base (13), the top of the base (13) is connected with the detection mechanism (4), and the bottom of the base (13) is provided with three moving guide rails (14) along the radial direction of the base (13);
a precise servo driving device is arranged in the base (13), and controls the three moving guide rails (14) to move along the radial direction of the base (13); the included angle of the adjacent moving guide rails (14) is 120 degrees, and each moving guide rail (14) is provided with a standard thread gauge (9); one of the movable guide rails (14) is fixed with a displacement sensor (12) and is used for measuring the distance of the movable guide rail (14) driving the standard thread gauge (9) to move, the tail end of each movable guide rail (14) is provided with a pretightening force measuring sensor (11) and is used for measuring the pretightening force of the standard thread gauge (9) after being contacted with the workpiece (2) to be detected; the bottom of the base (13) is also provided with a laser ranging sensor (10) for measuring the distance between the base (13) and the end face of the workpiece (2) to be detected;
The detection mechanism (4) comprises a connector, the top end of the connector is connected with the horizontal connecting component (6), the lower end of the connector is connected with a base (13) of the thread measuring component (3), and a signal acquisition and conversion circuit module of the thread measuring component (3) is arranged in the connector;
The parameter calculation component (6) comprises a display interface, a data storage system and a parameter calculation module, and is used for setting parameters, judging whether machining parameters are qualified or not, displaying a thread detection calculation result and storing detection data.
3. A detection method using the coarse-pitch tapered internal thread detection device according to claim 2, comprising the steps of:
step 1: inputting design parameters of the thread of the workpiece to be measured in a parameter calculation component display interface, wherein the design parameters of the thread comprise pitch diameter, pitch and taper of the thread;
step 2: placing a workpiece to be detected in a workpiece fixing assembly, and adjusting the workpiece fixing assembly to a proper height;
And step 3: the thread measuring assembly descends and penetrates into the threaded hole, the thread gauge is opened and matched with the internal thread, when the opening force reaches the set pretightening force, the thread gauge stops acting, and the workpiece fixing assembly clamps the workpiece; at this time, the displacement sensor measures the opening distance l of the screw gauge1The distance h between the laser sensor and the end face of the thread is measured by the laser sensor1obtaining a first set of data (l)1,h1)；
and 4, step 4: the thread gauge is retracted, and the thread measuring assembly is raised to H1 height, wherein H1 is N1S, N1 is the designated number of thread rings, and S is the design thread pitch; after the screw gauge is stretched again and reaches the set pretightening force, measuring the stretching distance l of the screw gauge2Distance h between laser sensor and end face of thread2Obtaining a second set of data (l)2,h2)；
and 5: the thread gauge is retracted again and raised to a height H2, where H2 ═ N2 · SN2 is the designated number of thread rings, S is the design thread pitch; repeating the operation of step S4 to obtain a third set of data (l)3,h3)；
step 6: calling a parameter calculation module of the parameter calculation component, calculating main thread machining parameters and judging whether thread machining is qualified or not;
And 7: and judging whether the thread machining is qualified or not according to the detection result, storing the detection result in a data storage system, and giving an action instruction to the workpiece sorting mechanism and the thread machining equipment according to the judgment result.
4. the method for detecting a coarse tapered internal thread according to claim 3, wherein the step 6 comprises the steps of:
Step 6-1: to (l)1,h1) As the origin, the axial direction of the workpiece is the Y axis, and the transverse direction is the X axis, a two-dimensional coordinate system is established, and two points X in the relative coordinate system are obtained1(δl2/2，δh2)，X2(δl3/2，δh3) Wherein:
δh2＝h2-h1，δh3＝h3-h1
δl2＝l2-l1，δl3＝l3-l1
step 6-2: according to X in step 6-11、X2Two points coordinate values, the slope k of a straight line passing through the two points is calculated, and the thread taper alpha is calculated, then:
k＝2(δh2-δh3)/(δl2-δl3)
α＝90°-arctan(k)
Comparing the calculated taper alpha with the designed taper beta, and if the calculated taper alpha is within the tolerance range, processing the thread taper to be qualified;
Step 6-3: calculating the actual machining thread pitch by the actual rising distance and the number of the thread rings, and then:
S1＝δh2/N1
S2＝δh3/(N1+N2)
Comparing S1 and S2 with the designed thread pitch S, and if the distance is within the tolerance range, processing the thread pitch to be qualified;
step 6-4: calculating X1、X2the radius length of the theoretical pitch diameter of the thread at the point is as follows:
l2-1＝δh2·tan(β)+l1
l3-1＝δh3·tan(β)+l1
the theoretical design value l2-1、l3-1And the actual measured value l2、l3And comparing, and if the difference is within the tolerance range, the pitch diameter of the thread is qualified.
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CN112815866A (en) * 2020-12-30 2021-05-18 沈阳理工大学 Internal thread detector based on laser profile scanning and detection method thereof
CN113899290A (en) * 2021-08-26 2022-01-07 四川航天川南火工技术有限公司 Movable internal thread semi-automatic detection device
CN114166396A (en) * 2022-02-14 2022-03-11 龙口市动力油管有限公司 Pre-tightening force and resilience force detection device with self-pre-tightening type isolation liner tube
CN116147555A (en) * 2023-04-19 2023-05-23 山东恒圣石墨科技有限公司 Device for detecting size of internal thread of graphite chuck and control method
CN118408485A (en) * 2024-07-04 2024-07-30 中北大学 Photoelectric information-based small-diameter deep hole detection system and method

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CN114166396A (en) * 2022-02-14 2022-03-11 龙口市动力油管有限公司 Pre-tightening force and resilience force detection device with self-pre-tightening type isolation liner tube
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CN116147555B (en) * 2023-04-19 2023-07-04 山东恒圣石墨科技有限公司 Device for detecting size of internal thread of graphite chuck and control method
CN118408485A (en) * 2024-07-04 2024-07-30 中北大学 Photoelectric information-based small-diameter deep hole detection system and method

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