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CN110906900A - Method for measuring polished rod run-out and end face verticality by taking pitch diameter of threads as reference - Google Patents

Method for measuring polished rod run-out and end face verticality by taking pitch diameter of threads as reference Download PDF

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Publication number
CN110906900A
CN110906900A CN201911209239.9A CN201911209239A CN110906900A CN 110906900 A CN110906900 A CN 110906900A CN 201911209239 A CN201911209239 A CN 201911209239A CN 110906900 A CN110906900 A CN 110906900A
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China
Prior art keywords
measuring
face
polished rod
bolt
thread
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Pending
Application number
CN201911209239.9A
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Chinese (zh)
Inventor
徐畅
隋天龙
吴强
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China Aviation Industry Standard Parts Manufacturing Co Ltd
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China Aviation Industry Standard Parts Manufacturing Co Ltd
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Priority to CN201911209239.9A priority Critical patent/CN110906900A/en
Publication of CN110906900A publication Critical patent/CN110906900A/en
Pending legal-status Critical Current

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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
    • 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
    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • A Measuring Device Byusing Mechanical Method (AREA)

Abstract

The invention discloses a method for measuring the runout and the end face verticality of a polished rod by taking the pitch diameter of a thread as a reference, which comprises the following steps: (1) installing a bolt; (2) selecting a probe; (3) determining a measuring point: selecting a plurality of uniformly distributed measuring points on a circle of threads; (4) establishing a benchmark: stretching a three-coordinate measuring probe (3) into a thread tooth socket (4) of a measured bolt (1) to acquire coordinate data and establish a reference; (5) measuring the jumping of the polish rod: the polished rod of the tested bolt (1) is subjected to contact measurement and acquisition to obtain a maximum value M and a minimum value M of the distance, and the jumping value t = M-M; (6) measuring the verticality of the end face: and (3) carrying out contact measurement acquisition on the outermost edge of the inner end face of the tested bolt (1) by using a three-coordinate measuring probe (3) to obtain a maximum value H and a minimum value H, and then, verticality D = H-H. The invention has the advantages of accuracy, reliability, simplicity, practicability, good effect and convenient operation, and is suitable for popularization and application of measurement of the runout and the end face verticality of the polished rod by taking the pitch diameter of the thread as a reference.

Description

Method for measuring polished rod run-out and end face verticality by taking pitch diameter of threads as reference
Technical Field
The invention belongs to the technical field of measuring methods, and particularly relates to a method for measuring the runout and the end face verticality of a polished rod by taking the pitch diameter of a thread as a reference.
Background
The precision bolt is widely applied to an aeroengine, and in order to ensure the reliability of bolt installation, the runout and the end face verticality of a bolt polish rod are usually measured by taking the pitch diameter of a thread as a reference, but the pitch diameter of the thread is not a solid line segment but a virtual line segment.
The measuring mode in production adopts a mode of converting reference, the major diameter of the thread is used as a medium diameter to replace reference, or a coaxiality ring gauge is used for measuring form and position tolerance. However, the two methods have the greatest disadvantage of poor measurement accuracy, and cannot meet the measurement requirements of high-precision bolts.
The reasons for such problems with product production are: the major diameter of the thread formed by rolling is naturally formed by material flowing, the tolerance of jumping and roundness is large, the measurement error is large, and the jumping value of the bolt polished rod to the pitch diameter of the thread cannot be truly reflected due to reference conversion. The coaxiality ring gauge measurement mode is greatly influenced by the manufacturing precision. And a gap exists between the ring gauge and the precise bolt when the ring gauge is matched with the precise bolt, so that the measurement error is increased, and the form and position tolerance of the high-precision bolt cannot be met.
Disclosure of Invention
The invention aims to overcome the defects and provide the method for measuring the runout and the end face verticality of the polished rod by taking the pitch diameter of the thread as the reference, which is accurate, reliable, simple, practical, good in effect and convenient to operate.
The purpose of the invention and the main technical problem of solving the invention are realized by adopting the following technical scheme:
the invention discloses a method for measuring the runout of a polished rod and the perpendicularity of an end face by taking the pitch diameter of a thread as a reference, which comprises the following steps:
(1) installing bolts: mounting the tested bolt on a three-coordinate measuring table;
(2) selecting a probe: selecting a matched three-coordinate measuring probe according to the thread pitch P of the tested bolt, wherein the diameter d =0.577P of a contact head of the three-coordinate measuring probe;
(3) determining a measuring point: randomly selecting a circle of threads in the middle of a tested bolt, and selecting a plurality of uniformly distributed measuring points on the circle of threads;
(4) establishing a benchmark: and aiming at the measuring points selected in the step, extending a three-coordinate measuring probe into a thread tooth socket of the measured bolt, and when the three-coordinate measuring probe is contacted with tooth shapes on two sides of the thread tooth socket, acquiring coordinate data by the measuring probe, fitting the pitch diameter of the measured bolt, and establishing a reference.
(5) Measuring the jumping of the polish rod: selecting a plurality of uniformly distributed measuring points on the polished rod of the tested bolt, and performing contact type measurement acquisition on the polished rod of the tested bolt by means of a three-coordinate measuring probe according to the intermediate diameter reference established in the step (4) to obtain a maximum value M and a minimum value M of the distance, wherein the jumping value t = M-M;
(6) measuring the verticality of the end face: selecting a plurality of uniformly distributed measuring points on the outermost edge of the inner end face of the head of the measured bolt, and carrying out contact type measurement acquisition on the outermost edge of the inner end face of the measured bolt by means of a three-coordinate measuring probe according to the intermediate diameter reference established in the step to obtain the maximum value H and the minimum value H, wherein the verticality D = H-H.
The method for measuring the polished rod bounce and the end face verticality by taking the pitch diameter of the threads as the reference comprises the following steps: in the step (3), 3-5 measuring points are selected on the threads.
The method for measuring the polished rod bounce and the end face verticality by taking the pitch diameter of the threads as the reference comprises the following steps: and (5) selecting 5-10 measuring points on the light bar.
The method for measuring the polished rod bounce and the end face verticality by taking the pitch diameter of the threads as the reference comprises the following steps: in the step (6), 5-10 measuring points are selected on the outermost edge of the inner end face.
Compared with the prior art, the invention has obvious advantages and beneficial effects. According to the technical scheme, in the method for measuring the polished rod bounce and the end face verticality by taking the pitch diameter of the threads as the reference, the measurement is completed by the steps of installing bolts, selecting probes, determining measurement points, establishing the reference, measuring the polished rod bounce and measuring the end face verticality and the like, and the pitch diameter is more accurate and reliable by taking the pitch diameter as the reference; selecting a matched three-coordinate measuring probe according to the thread pitch P of the tested bolt, wherein the diameter d =0.577P of a contact head of the three-coordinate measuring probe, so that an accurate measurement value can be obtained by means of the three-coordinate measuring probe; in the step (3), 3-5 measuring points are selected on the threads, 5-10 measuring points are selected on the light bar in the step (5), and 5-10 measuring points are selected on the outermost edge of the inner end face in the step (6), so that the measured value is more reliable. In a word, the invention is accurate, reliable, simple and practical, has good effect and convenient operation, and is suitable for popularization and application of the measurement of the runout of the polished rod and the end face verticality by taking the pitch diameter of the thread as a reference.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a partial enlarged view of a in FIG. 1;
fig. 3 is a using state diagram of end face verticality measurement.
The labels in the figure are:
1. a tested bolt; 2. a three-coordinate measuring table; 3. a three-coordinate measurement probe; 4. a thread socket.
Detailed Description
The method, structure, features and effects of the present invention for measuring the run-out and end face verticality of a polished rod based on the pitch diameter of a thread are described in detail below with reference to the accompanying drawings and preferred embodiments.
Referring to fig. 1 to 3, the method for measuring the polished rod runout and the end face verticality by taking the pitch diameter of the threads as the reference comprises the following steps:
(1) installing bolts: installing a tested bolt 1 on a three-coordinate measuring table 2;
(2) selecting a probe: selecting a matched three-coordinate measuring probe 3 according to the thread pitch P of the tested bolt 1, wherein the diameter d of a contact head of the three-coordinate measuring probe 3 is = 0.577P;
(3) determining a measuring point: randomly selecting a circle of threads in the middle of a tested bolt 1, and selecting a plurality of uniformly distributed measuring points on the circle of threads;
(4) establishing a benchmark: aiming at the measuring points selected in the step 3, a three-coordinate measuring probe 3 is inserted into a thread tooth socket 4 of the measured bolt 1, when the three-coordinate measuring probe 3 is contacted with tooth shapes on two sides of the thread tooth socket 4, the measuring probe 3 collects coordinate data, fits the intermediate diameter of the measured bolt 1 and establishes a reference;
(5) measuring the jumping of the polish rod: selecting a plurality of uniformly distributed measuring points on the polished rod of the tested bolt 1, and carrying out contact type measurement and acquisition on the polished rod of the tested bolt 1 by means of the three-coordinate measuring probe 3 according to the intermediate diameter reference established in the step 4 to obtain a maximum value M and a minimum value M of the distance, wherein the jumping value t = M-M;
(6) measuring the verticality of the end face: selecting a plurality of uniformly distributed measuring points on the outermost edge of the inner end face of the head of the measured bolt 1, and performing contact measurement acquisition on the outermost edge of the inner end face of the measured bolt 1 by means of the three-coordinate measuring probe 3 on the basis of the intermediate diameter established in the step 4 to obtain a maximum value H and a minimum value H, wherein the verticality D = H-H.
In the step (3), 3-5 measuring points are selected on the threads. And (5) selecting 5-10 measuring points on the light bar. In the step (6), 5-10 measuring points are selected on the outermost edge of the inner end face.
The invention has the advantages of accuracy, reliability, simplicity, practicability, good effect and convenient operation, and is suitable for popularization and application of measurement of the runout and the end face verticality of the polished rod by taking the pitch diameter of the thread as a reference.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the present invention without departing from the technical spirit of the present invention.

Claims (4)

1.一种以螺纹中径为基准对光杆跳动及端面垂直度测量的方法，包括以下步骤：1. A method for measuring smooth rod runout and end face verticality based on the pitch diameter of the thread, comprising the following steps: （1）安装螺栓：将被测螺栓（1）安装在三坐标测量台（2）上；(1) Mounting bolts: Install the tested bolts (1) on the CMM (2); （2）选择探针：根据被测螺栓（1）的螺纹螺距P选取配套的三坐标测量探针（3），三坐标测量探针（3）接触头的直径d=0.577P；(2) Select the probe: according to the thread pitch P of the tested bolt (1), select the matching three-coordinate measuring probe (3), the diameter of the contact head of the three-coordinate measuring probe (3) d=0.577P; （3）确定测量点：任意选取被测螺栓（1）中间的一圈螺纹，并在该圈螺纹上选取均匀排布的若干测量点；(3) Determine the measuring points: arbitrarily select a circle of threads in the middle of the tested bolt (1), and select several measuring points evenly arranged on the circle of threads; （4）建立基准：针对步骤（3）中选出的测量点，将三坐标测量探针（3）伸入被测螺栓（1）的螺纹牙槽（4）中，当三坐标测量探针（3）接触至螺纹牙槽（4）两侧牙型后，测量探针（3）采集坐标数据，并拟合出被测螺栓（1）的中径，建立基准；(4) Establish a benchmark: for the measurement point selected in step (3), insert the three-coordinate measuring probe (3) into the thread groove (4) of the bolt (1) under test, when the three-coordinate measuring probe (3) After contacting the tooth profile on both sides of the thread groove (4), the measuring probe (3) collects the coordinate data, and fits the pitch diameter of the bolt (1) under test to establish a benchmark; （5）测量光杆跳动：在被测螺栓（1）的光杆上选取均匀排布的若干测量点，以步骤（4）中建立的中径基准，借助三坐标测量探针（3）对被测螺栓（1）的光杆进行接触式测量采集得到距离最大值M和最小值m，则跳动值t=M-m；(5) Measure the runout of the polished rod: Select several measuring points evenly arranged on the polished rod of the tested bolt (1), and use the three-coordinate measuring probe (3) to measure the measured point based on the pitch diameter established in step (4). The polished rod of the bolt (1) is collected by contact measurement to obtain the maximum distance M and the minimum distance m, then the runout value t=M-m; （6）测量端面垂直度：在被测螺栓（1）头部的内端面最外边缘选取均匀排布的若干测量点，以步骤（4）中建立的中径基准，借助三坐标测量探针（3）对被测螺栓（1）的内端面最外边缘进行接触式测量采集得到最大值H和最小值h，则垂直度D=H-h。(6) Measure the verticality of the end face: select several measuring points evenly arranged at the outermost edge of the inner end face of the head of the tested bolt (1), and use the three-coordinate measuring probe based on the pitch diameter established in step (4). (3) Perform contact measurement on the outermost edge of the inner end face of the tested bolt (1) to obtain the maximum value H and the minimum value h, then the perpendicularity D=H-h. 2.如权利要求1所述的以螺纹中径为基准对光杆跳动及端面垂直度测量的方法，其特征在于：步骤（3）中螺纹上选取的测量点为3-5个。2. The method for measuring the runout of the polished rod and the verticality of the end face based on the pitch diameter of the thread as claimed in claim 1, wherein the number of measurement points selected on the thread in step (3) is 3-5. 3.如权利要求1所述的以螺纹中径为基准对光杆跳动及端面垂直度测量的方法，其特征在于：步骤（5）中光杆上选取的测量点为5-10个。3. The method for measuring the runout and end face perpendicularity of the polished rod based on the pitch diameter of the thread as claimed in claim 1, wherein the number of measurement points selected on the polished rod in step (5) is 5-10. 4.如权利要求1所述的以螺纹中径为基准对光杆跳动及端面垂直度测量的方法，其特征在于：步骤（6）中内端面最外边缘上选取的测量点为5-10个。4. The method for measuring the runout of the polished rod and the verticality of the end face based on the pitch diameter of the thread as claimed in claim 1, wherein the measurement points selected on the outermost edge of the inner end face in the step (6) are 5-10 .
CN201911209239.9A 2019-11-30 2019-11-30 Method for measuring polished rod run-out and end face verticality by taking pitch diameter of threads as reference Pending CN110906900A (en)

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JP2001272215A (en) * 2000-03-23 2001-10-05 Niigata Eng Co Ltd Measuring method of screw, apparatus therefor and determining apparatus for propriety of shape of screw
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Application publication date: 20200324