A fully automatic threaded inner hole measurement method

Abstract

The present invention provides a method for measuring the internal hole of a threaded part by using a main machine of a fully automatic length measuring machine through the following steps: Step 1: automatic calibration process of a measuring ball or a measuring needle; Step 2: automatic bottom finding process of a measuring ball; Step 3: fully automatic measurement process of a threaded part of a threaded part. The present invention achieves fully automatic measurement and improved efficiency by realizing automatic bottom finding of a measuring ball (needle), automatic thread groove finding, and automatic measurement of internal threads; automatic protection of the measuring needle to prevent the measuring needle from being damaged; no need to manually move the measuring needle to find the groove, which facilitates the measurement of small threaded holes that cannot be clearly seen by the eyes. The present invention is suitable for fully automatic measurement equipment for similar types of threaded workpieces, inner holes, and external threads of thread gauges.

Description

Technical Field

[0001] The invention relates to a thread measuring method, in particular to a thread inner hole measuring method. Background Art

[0002] At present, the measurement method of using a length measuring machine for threaded internal holes on the market generally adopts an electric moving method to make the measuring ball (needle) contact the threaded internal hole groove. The electric contact measurement method on the fully automatic length measuring machine has many measurement steps, and the measuring ball (needle) needs to be moved electrically each time it contacts the tooth shape; it cannot truly realize the fully automatic moving measurement of the threaded internal hole by the instrument;

[0003] Disadvantages of existing technical solutions:

[0004] Non-automatic measurement, low measurement efficiency;

[0005] For some very small threaded internal holes and internal holes with small thread pitch, it is difficult to see the accurate tooth groove with the eyes during measurement, and the electric contact is easy to touch the top of the thread, resulting in a large deviation in the measurement result;

[0006] When the stylus ball (needle) is electrically controlled to withdraw from the threaded hole, the eyes cannot accurately determine whether it has been withdrawn, and vertical movement may cause damage to the stylus ball (needle). Summary of the invention

[0007] In order to realize the fully automatic measurement of the inner hole of a thread on a semi-automatic length measuring machine, the inventor designed a fully automatic thread inner hole measurement method based on the fully automatic length measuring machine.

[0008] A fully automatic threaded inner hole measuring method, the method is completed by using a fully automatic length measuring machine host, the host of the fully automatic length measuring machine includes a base, a fully automatic moving head seat, a control system, a threaded inner hole measuring device, a fully automatic five-axis workbench, a standard ring gauge and a tailstock;

[0009] The base is provided with a guide rail; the fully automatic moving headstock slides on the guide rail of the base; the control system is a computer, which is provided with control software to control automatic measurement; the thread inner hole measuring device is fixed on the fully automatic moving headstock; the thread inner hole measuring device is provided with a measuring ball to measure the data of the internal thread; the fully automatic five-axis workbench is placed on the guide rail of the base and slides along the X direction; the standard ring gauge is set on the fully automatic five-axis workbench; the tailstock is fixed on the guide rail of the base;

[0010] The front end of the threaded inner hole measuring device is mainly composed of the following components: Z0 grating reading system, Z0 / X0 grating reading system fixing plate, X0 grating reading scale movable swing arm, X0 grating reading system, probe and measuring rod, Z0 sliding track, Z0 grating reading scale fixing seat and device fixing bracket, and the probe and measuring rod are provided with a measuring ball;

[0011] A fully automatic threaded inner hole measurement method is completed by using the above-mentioned fully automatic length measuring machine host through the following steps:

[0012] Step 1: Automatic calibration process of the measuring ball or measuring needle;

[0013] Step 1.1: Standard ring gauge leveling process;

[0014] Step 1.2: Threaded inner hole calibration process;

[0015] Step 1.2.1: The measuring ball contacts the left side of the standard ring gauge;

[0016] Step 1.2.2: Find the turning point in the left diameter direction;

[0017] Step 1.2.3: The measuring ball contacts the right side of the standard ring gauge;

[0018] Step 1.2.4: Obtain the calibration value M by subtracting the difference between the two sides of the standard ring gauge diameter;

[0019] Step 2: Automatic bottom finding process of the measuring ball;

[0020] Step 2.1: The measuring ball is fixed on the elastic device, the initial position is Z0;

[0021] Step 2.2: The elastic ball device automatically moves downward along with the Z axis;

[0022] Step 2.3: When in contact, Z1 is less than Z0, indicating that the bottom is in contact;

[0023] Step 3: Fully automatic measurement process of threaded inner hole;

[0024] Step 3.1: Automatic thread groove finding process;

[0025] Step 3.1.1: The measuring ball is fixed on the elastic device, with the initial position X0 in the X direction;

[0026] Step 3.1.2: Move to any position of the screw thread, and the probe ball contacts the left side to obtain the contact value X1;

[0027] Step 3.1.3: Move up half the pitch P / 2, the probe ball contacts the left side, and the contact value X2 is obtained;

[0028] Step 3.1.4: When X2>X1, it means the second contact with the groove, otherwise it means the top contact;

[0029] Step 3.2 Internal thread automatic measurement process;

[0030] Step 3.2.1: The probe touches the first tooth socket on the left and reads X 00 Position value;

[0031] Step 3.2.2: Move the probe up one pitch p, contact the second tooth socket, and read X 01 Location;

[0032] Step 3.2.3: Move the probe down half a pitch, contact the middle tooth socket on the right side, and read X 02 Location;

[0033] Step 3.2.4: Through X 00 , X 01 , X 02 Position and X displacement distance ΔL, and then according to the calibration value C, the diameter of the measuring ball d D , calculate the thread major diameter D2 according to the following formula:

[0034]

[0035] As a further improvement of the present invention, step 1.1 specifically includes the following steps:

[0036] Step 1.1.1: Place the standard ring gauge and press it tightly;

[0037] Step 1.1.2: The measuring ball contacts the left side of the standard ring gauge;

[0038] Step 1.1.3: Find the inflection point in the diameter direction;

[0039] Step 1.1.4: Make the standard ring gauge horizontal by tilting and adjusting. It can also be understood that the left side of the standard ring gauge is perpendicular to the horizontal plane of the instrument.

[0040] As a further improvement of the present invention, the step 1.1.3: the method for finding the inflection point is as follows: the measuring ball is automatically moved by the motor drive in the Y direction, and the actual value of the X0 grating is read through the X0 grating reading system, and whether the inflection point is found is determined by judging the maximum / minimum extreme value point of the actual value of the X0 grating.

[0041] As a further improvement of the present invention, the standard ring gauge is fixed and pressed on the table surface of the fully automatic five-axis workbench by a pressing plate.

[0042] As a further improvement of the present invention, the probe and the measuring rod swing along the X direction together with the movable swing arm of the X0 grating reading scale; the Z0 grating reading scale fixing seat is connected to the device fixing bracket; the probe and the measuring rod are provided with a grating reading scale, the Z0 grating reading scale fixing seat is provided with a grating reading scale, the Z0 grating reading system is arranged on the Z0 / X0 grating reading system fixing plate, the X0 grating reading system is arranged on the Z0 / X0 grating reading system fixing plate, and the Z0 / X0 grating reading system fixing plate slides relative to the Z0 grating reading scale fixing seat along the Z0 sliding track.

[0043] The beneficial effects of the present invention are:

[0044] The present invention realizes automatic bottoming of the measuring ball (needle), automatic tooth groove finding of the thread, and automatic measurement of the internal thread; achieves full-automatic measurement and improves efficiency; the measuring needle is automatically protected to prevent the measuring needle from being damaged; there is no need to manually move the measuring needle to find the tooth groove, which is convenient for measuring small threaded holes that cannot be clearly seen by the eyes. The present invention is suitable for full-automatic measurement equipment for similar types of threaded workpieces, inner holes and external teeth of thread gauges. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 :Diagram of the device used in the fully automatic threaded inner hole measurement method;

[0046] Figure 2 : Figure 1 A partial enlarged view of

[0047] Figure 3 : Figure 1 Schematic diagram of some parts;

[0048] Figure 4 : Figure 3 Enlarged image on the left;

[0049] Figure 5 : Schematic diagram of the standard ring gauge leveling process;

[0050] Figure 6 :Threaded inner hole measuring ball (needle) calibration process;

[0051] Figure 7 : Automatic bottom finding process of measuring ball (needle);

[0052] Figure 8 : Automatic internal thread groove finding process;

[0053] Fig. 9 : Automatic measurement process of internal thread.

[0054] The names of the components in the figure are as follows:

[0055] Base 1-1, fully automatic moving headstock 1-2, control system 1-3, threaded inner hole measuring device 1-4, fully automatic five-axis workbench 1-5, standard ring gauge 1-6, tailstock 1-7;

[0056] Z0 grating reading system 1-4-1, Z0 / X0 grating reading system fixing plate 1-4-2, X0 grating reading scale movable swing arm 1-4-3, X0 grating reading system 1-4-4, measuring head and measuring rod 1-4-5, Z0 sliding rail 1-4-6, Z0 grating reading scale fixing seat 1-4-7, device fixing bracket 1-4-8. DETAILED DESCRIPTION

[0057] The present invention will be further described below in conjunction with the accompanying drawings.

[0058] The invention discloses a fully automatic threaded inner hole measuring method, which is completed by using a high-precision fully automatic length measuring machine host.

[0059] like Figure 1 The main machine of the high-precision fully automatic length measuring machine includes a base 1-1, a fully automatic moving head base 1-2, a control system 1-3, a threaded inner hole measuring device 1-4, a fully automatic five-axis workbench 1-5, a standard ring gauge 1-6 and a tailstock 1-7;

[0060] The base 1-1 is a marble base with a guide rail on it; the fully automatic moving head seat 1-2 slides on the guide rail of the base 1-1 (the servo module system drives the head seat to slide);

[0061] The control system 1-3 can be fixed on the rear side of the base 1-1; the control system 1-3 is a computer, which is equipped with control software to control automatic measurement;

[0062] The threaded inner hole measuring device 1-4 is fixed on the fully automatic moving head seat 1-2 by screws; the threaded inner hole measuring device 1-4 is provided with a thread measuring ball or a thread measuring needle for measuring the data of the inner thread;

[0063] The fully automatic five-axis workbench 1-5 is placed on the guide rail of the base 1-1 and can slide and move along the X direction;

[0064] The standard ring gauge 1-6 is placed on the fully automatic five-axis workbench 1-5, and can be fixed and pressed on the table of the fully automatic five-axis workbench 1-5 using a pressing plate;

[0065] The tailstock 1-7 is fixed on the guide rail of the base 1-1.

[0066] The front end of the threaded inner hole measuring device 1-4 is mainly composed of the following components:

[0067] Z0 grating reading system 1-4-1, Z0 / X0 grating reading system fixing plate 1-4-2, X0 grating reading scale movable swing arm 1-4-3, X0 grating reading system 1-4-4, measuring head and measuring rod 1-4-5, Z0 sliding track 1-4-6, Z0 grating reading scale fixing seat 1-4-7 and device fixing bracket 1-4-8. A measuring ball is arranged on the measuring head and measuring rod 1-4-5.

[0068] The probe and the measuring rod 1-4-5 swing along the X direction together with the X0 grating reading scale movable swing arm 1-4-3; the Z0 grating reading scale fixing seat 1-4-7 is connected with the device fixing bracket 1-4-8; the probe and the measuring rod 1-4-5 are provided with a grating reading scale, the Z0 grating reading scale fixing seat 1-4-7 is provided with a grating reading scale, the Z0 grating reading system 1-4-1 is arranged on the Z0 / X0 grating reading system fixing plate 1-4-2, the X0 grating reading system 1-4-4 is arranged on the Z0 / X0 grating reading system fixing plate 1-4-2, and the Z0 / X0 grating reading system fixing plate 1-4-2 slides relatively with the Z0 grating reading scale fixing seat 1-4-7 along the Z0 sliding track 1-4-6.

[0069] The method of the present invention is completed by using the above-mentioned high-precision fully automatic length measuring machine host through the following steps:

[0070] Step 1: Automatic calibration process of the measuring ball or measuring needle;

[0071] Step 1.1: Standard ring gauge leveling process ( Figure 5 );

[0072] Step 1.1.1: Place standard ring gauges 1-6 and press tightly;

[0073] Step 1.1.2: The probe ball contacts the left side of the standard ring gauge 1-6. The left side here refers to the negative direction of the horizontal X direction perpendicular to the Y direction in the figure. In addition, the vertical direction perpendicular to the Y direction in the figure is the Z direction;

[0074] Step 1.1.3: Find the inflection point in the diameter direction;

[0075] The measuring ball is driven by the motor in the Y direction to move automatically, and the actual value of the X0 grating is read through the X0 grating reading system 1-4-4. The maximum / minimum extreme value point of the actual value of the X0 grating is judged to determine whether the inflection point is found. In the following steps, the method of finding the inflection point is similar to this step;

[0076] Step 1.1.4: Make the standard ring gauge 1-6 horizontal by tilting and adjusting, which can also be understood as the left side of the standard ring gauge 1-6 is perpendicular to the horizontal plane of the instrument;

[0077] Step 1.2: Threaded bore calibration process ( Figure 6 );

[0078] Step 1.2.1: The probe ball contacts the left side of the standard ring gauge 1-6;

[0079] Step 1.2.2: Find the turning point in the left diameter direction;

[0080] Step 1.2.3: The measuring ball contacts the right side of the standard ring gauge 1-6;

[0081] Step 1.2.4: Obtain the calibration value M by subtracting the difference between the two sides of the diameter of the standard ring gauge 1-6;

[0082] Step 2: Automatic bottom finding process of the measuring ball ( Figure 7 );

[0083] Step 2.1: The measuring ball is fixed on the elastic device, the initial position is Z0;

[0084] Step 2.2: The elastic ball device automatically moves downward along with the Z axis;

[0085] Step 2.3: When in contact, Z1 is less than Z0, indicating that the bottom is in contact;

[0086] Step 3: Fully automatic measurement process of threaded inner hole;

[0087] Step 3.1 Thread automatic groove finding process ( Figure 8 );

[0088] Step 3.1.1: The measuring ball is fixed on the elastic device, with the initial position X0 in the X direction;

[0089] Step 3.1.2: Move to any position of the screw thread, and the probe ball contacts the left side to obtain the contact value X1;

[0090] Step 3.1.3: Move up half the pitch P / 2, the probe ball contacts the left side, and the contact value X2 is obtained;

[0091] Step 3.1.4: When X2>X1, it means the second contact with the groove, otherwise it means the top contact;

[0092] Step 3.2 Internal thread automatic measurement process ( Fig. 9 )

[0093] Step 3.2.1: The probe touches the first tooth socket on the left and reads X 00 Position value;

[0094] Step 3.2.2: Move the probe up one pitch p, contact the second tooth socket, and read X 01 Location;

[0095] Step 3.2.3: Move the probe down half a pitch, contact the middle tooth socket on the right side, and read X 02 Location;

[0096] Step 3.2.4: Through X 00 , X 01 , X 02 Position and X displacement distance ΔL, and then according to the calibration value C, the diameter of the measuring ball d D , calculate the thread major diameter D2 according to the following formula:

[0097]

[0098] Note: Regarding the stylus ball and stylus needle, the stylus ball is preferred, but the stylus needle can also be used.

[0099] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A fully automatic threaded inner hole measurement method, characterized in that: The method is completed by using a main machine of a fully automatic length measuring machine, wherein the main machine of the fully automatic length measuring machine comprises a base (1-1), a fully automatic moving head base (1-2), a control system (1-3), a threaded inner hole measuring device (1-4), a fully automatic five-axis worktable (1-5), a standard ring gauge (1-6) and a tailstock (1-7); The base (1-1) is provided with a guide rail; the fully automatic moving headstock (1-2) slides on the guide rail of the base (1-1); the control system (1-3) is a computer, which is provided with control software for controlling automatic measurement; the threaded inner hole measuring device (1-4) is fixed on the fully automatic moving headstock (1-2); the threaded inner hole measuring device (1-4) is provided with a measuring ball for measuring the data of the inner thread; the fully automatic five-axis worktable (1-5) is placed on the guide rail of the base (1-1) and slides along the X direction; the standard ring gauge (1-6) is arranged on the fully automatic five-axis worktable (1-5); the tailstock (1-7) is fixed on the guide rail of the base (1-1); The front end of the threaded inner hole measuring device (1-4) is mainly composed of the following components: a Z0 grating reading system (1-4-1), a grating reading system fixing plate (1-4-2), an X0 grating reading scale movable swing arm (1-4-3), an X0 grating reading system (1-4-4), a probe and a measuring rod (1-4-5), a Z0 sliding track (1-4-6), a Z0 grating reading scale fixing seat (1-4-7) and a device fixing bracket (1-4-8), and a measuring ball is arranged on the probe and the measuring rod (1-4-5); The measuring head and measuring rod (1-4-5) swing along the X direction with the X0 grating reading scale movable swing arm (1-4-3); the Z0 grating reading scale fixing seat (1-4-7) is connected to the device fixing bracket (1-4-8); the measuring head and measuring rod (1-4-5) are provided with a grating reading scale, the Z0 grating reading scale fixing seat (1-4-7) is provided with a grating reading scale, the Z0 grating reading system (1-4-1) is arranged on the grating reading system fixing plate (1-4-2), the X0 grating reading system (1-4-4) is arranged on the grating reading system fixing plate (1-4-2), the grating reading system fixing plate (1-4-2) slides relative to the Z0 grating reading scale fixing seat (1-4-7) along the Z0 sliding track (1-4-6), A fully automatic threaded inner hole measurement method is completed by using the above-mentioned fully automatic length measuring machine host through the following steps: Step 1: Automatic calibration process of the measuring ball or measuring needle; Step 1.1: Standard ring gauge leveling process; Step 1.2: Threaded inner hole calibration process; Step 1.2.1: The probe ball contacts the left side of the standard ring gauge (1-6); Step 1.2.2: Find the turning point in the left diameter direction; Step 1.2.3: The probe ball contacts the right side of the standard ring gauge (1-6); Step 1.2.4: Obtain the calibration value M by subtracting the difference between the two sides of the diameter of the standard ring gauge (1-6); Step 2: Automatic bottom finding process of the measuring ball; Step 2.1: The measuring ball is fixed on the elastic device, the initial position is Z0; Step 2.2: The elastic ball device automatically moves downward along with the Z axis; Step 2.3: When in contact, Z1 is less than Z0, indicating that the bottom is in contact; Step 3: Fully automatic measurement process of threaded inner hole; Step 3.1: Automatic thread groove finding process; Step 3.1.1: The measuring ball is fixed on the elastic device, with the initial position X0 in the X direction; Step 3.1.2: Move to any position of the screw thread, and the probe ball contacts the left side to obtain the contact value X1; Step 3.1.3: Move up half the pitch P / 2, the probe ball contacts the left side, and the contact value X2 is obtained; Step 3.1.4: When X2>X1, it means the second contact is in the groove, otherwise it is the top contact; Step 3.2 Internal thread automatic measurement process; Step 3.2.1: The probe touches the first tooth socket on the left and reads X 00 Position value; Step 3.2.2: The probe moves up one pitch p to contact the second tooth socket and read the X01 position; Step 3.2.3: Move the probe down half a pitch to contact the middle tooth socket on the right side and read the X02 position; Step 3.2.4: Calculate the thread major diameter D2 using the X00, X01, X02 positions and the X displacement distance ΔL, the calibration value M, and the ball diameter dD according to the following formula: ， The method for finding the inflection point is as follows: the measuring ball is automatically moved by the motor drive in the Y direction, and the actual value of the X0 grating is read through the X0 grating reading system (1-4-4). Whether the inflection point is found is determined by judging the maximum or minimum extreme point of the actual value of the X0 grating.

2. A fully automatic threaded inner hole measurement method according to claim 1, characterized in that: Step 1.1 specifically includes the following steps: Step 1.1.1: Place the standard ring gauge (1-6) and press tightly; Step 1.1.2: The probe ball contacts the left side of the standard ring gauge (1-6); Step 1.1.3: Find the inflection point in the diameter direction; Step 1.1.4: Make the standard ring gauge (1-6) horizontal by tilting and adjusting. It can also be understood that the left side of the standard ring gauge (1-6) is perpendicular to the horizontal plane of the instrument.

3. A fully automatic threaded inner hole measurement method according to claim 1, characterized in that: The standard ring gauge (1-6) is fixed and pressed on the table surface of the fully automatic five-axis worktable (1-5) by a pressing plate.

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