CN111272076A

CN111272076A - Method for measuring position tolerance of hole type automobile composite material molded part to reference shaft

Info

Publication number: CN111272076A
Application number: CN202010246704.2A
Authority: CN
Inventors: 刘浏; 曹清林; 邱睿
Original assignee: Jiangsu University of Technology
Current assignee: Jiangsu University of Technology
Priority date: 2020-04-01
Filing date: 2020-04-01
Publication date: 2020-06-12
Anticipated expiration: 2040-04-01
Also published as: CN111272076B

Abstract

The invention discloses a method for measuring the position tolerance of a hole type automobile composite material molded part to a reference shaft, which comprises the following steps: arranging a sensor measuring component and a laser measuring component; one end of the outer surface of the reference shaft is provided with a V-shaped reference seat; respectively arranging a reference PSD sensor array and a laser to be tested; and respectively obtaining a plurality of spatial position data of the four spheres in the laser measuring assembly on the reference shaft and the four spheres in the sensor measuring assembly on the hole type automobile composite material molded part, and finally, processing the data to obtain the position tolerance of the axis of the hole type automobile composite material molded part to the axis of the reference shaft. The method for measuring the position tolerance of the hole type automobile composite material molded part to the reference shaft is simple and easy to master, the measuring efficiency is high, the measuring precision is accurate, and the measuring device is relatively simple in structure, easy to operate and low in price.

Description

Method for measuring position tolerance of hole type automobile composite material molded part to reference shaft

Technical Field

The invention belongs to the technical field of position tolerance measurement, and particularly relates to a method for measuring position tolerance of a hole type automobile composite material die-formed part to a reference shaft.

Background

The adoption of the composite material parts is an important means for reducing the weight of the automobile and an important method for reducing the gasoline consumption of the automobile. The national science and technology major project ' high-grade numerical control machine tool and basic manufacturing equipment ' (04 special for short), the ' automobile composite material body die-pressing forming technology and equipment ' project ' approved in 2018 (2018 ZX 04026001), and the Chery company is a lead unit. The college undertakes the sub-topic of digital design analysis and production line reliability guarantee evaluation of composite material molded parts (2018 ZX 04026001-008). The geometric tolerance of the composite material forming piece, the die and the pressing machine is very important for ensuring the product quality.

The national standard GB/T1958-2004 product geometric technical Specification (GPS) shape and position tolerance detection rules mentioned various detection methods, and the measuring tools used include mechanical measuring tools and three-coordinate measuring machines. The mechanical measuring tool is low in measuring efficiency, and data processing cannot be achieved electronically. The three-coordinate measuring machine has a complex structure, is complex to operate, has low measuring efficiency relative to special equipment, and is not suitable for being used in non-three-coordinate special measuring room environments such as large batch, production workshops and the like.

Disclosure of Invention

The invention aims to solve the problems and provides a method for measuring the position tolerance of a hole type automobile composite material molded part to a reference shaft, which has the advantages of simple structure, simple and easy operation, high measurement efficiency and accurate measurement precision.

The technical scheme for achieving one of the purposes of the invention is that a method for measuring the position tolerance of a hole type automobile composite material die-formed part to a reference shaft is adopted, the position tolerance is parallelism, the method comprises ①, a sensor measuring assembly and a laser measuring assembly are arranged, the sensor measuring assembly comprises a first measuring seat, four first supporting legs fixedly arranged below the first measuring seat, a first sphere arranged at the bottom end of each first supporting leg and a PSD sensor array fixedly arranged above the first measuring seat, the sphere center connecting lines of the four first spheres form a rectangle R, the PSD sensor array is composed of PSD sensors with a plurality of photosensitive surfaces located in the same plane, the photosensitive surfaces of all the PSD sensors are perpendicular to the rectangle R and parallel to the same side of the rectangle R, and all the PSD sensor arrays are measuredThe laser measuring assembly comprises a second measuring seat, four second support legs fixedly arranged below the second measuring seat, a second ball arranged at the bottom end of each second support leg, and two lasers fixedly arranged above the second measuring seat, wherein the sphere centers of the four second balls are connected to form a rectangle R ', two laser axes emitted by the two lasers are parallel to the same side of the rectangle R ', the plane where the two parallel laser axes are located is parallel to the rectangle R ', the relative position relation between the two laser axes emitted by the two lasers and the four second balls is measured and recorded as L, a V-shaped reference seat is arranged at one end of the outer surface of the reference shaft, two symmetrical inclined planes of the V-shaped reference seat are in contact with the outer surface of the reference shaft, and the V-shaped reference seat is arranged on the outer surface of the V-shaped reference seatTwo areAnIntersection line of symmetrical inclined planesParallel to the axis of the reference shaft; a reference PSD sensor array with a photosensitive surface facing the reference shaft is fixedly arranged on one side of the V-shaped reference seat through a reference support；The reference PSD sensor array consists of a plurality of reference PSD sensors with photosensitive surfaces located in the same plane; all reference PSD sensor photosurfaces are perpendicular to the V-shaped reference seatTwo areAnThe intersection line of the symmetrical inclined planes;measuring the relative position relation of the photosensitive surfaces of all the reference PSD sensors and recording as S0; two first to-be-measured lasers are fixedly installed on one side of the V-shaped reference seat through two first supports, the two emission directions of the first to-be-measured lasers face to the first to-be-measured lasers in the hole type automobile composite material die-formed part, and two laser axes emitted by the two first to-be-measured lasers are parallel to the V-shaped reference seatTwo areAnIntersection line of symmetrical inclined planesThe method comprises the steps of measuring the distance between two laser axes emitted by two first lasers to be measured and recording the distance as L1, placing ③ the laser measuring assembly outside a reference shaft, enabling the emitting directions of the two lasers to face a reference PSD sensor array, enabling four second spheres to be in full contact with the outer surface of the reference shaft for the first time at four points, and recording the measuring position as X1-Y1, wherein X1 represents the axial position of the measuring position, and Y1 represents the axial position of the measuring positionCircumferential position of the measurement location; will be described inTwo are providedThe method comprises the steps of fully opening lasers, sensing by a reference PSD sensor on a reference PSD sensor array to obtain two laser sensing points, obtaining spatial position data X1-Y1 of the four second spheres at the measuring position outside a reference shaft by S0 and L, repeating step ③ by ④ to obtain spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) of the four second spheres at a plurality of axial positions outside the reference shaft, placing a sensor measuring assembly in the hole type automobile composite material die forming piece by ⑤, enabling the PSD sensor array to face the two first lasers to be measured, enabling the four first spheres to be in full four-point contact with the inner surface of the hole type automobile composite material die forming piece for the first time, and marking the measuring position as XX1-YY1, wherein XX1 represents the axial position of the measuring position, YY1 represents the circumferential position of the measuring position, and marking the circumferential position of the hole type automobile composite material die forming piece as XX1-YY1Two are providedThe method comprises the steps of fully opening a first laser to be detected, detecting the first laser by a PSD sensor on a PSD sensor array to obtain two laser detection points, obtaining spatial position data XX1-YY1 of the four first spheres at the detection position in the hole type automobile composite material die-formed piece through L1 and S, repeating step ⑤ through ⑥ to obtain spatial position data XXi-YYj (i =1,2, … …, m; j =1,2, … …, n) of the four first spheres at a plurality of axial positions in the hole type automobile composite material die-formed piece, and processing ⑦ all the spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) and XXi-YYj (i =1,2, … …, m; j =1,2, … …, n), so that the parallelism of the axis of the hole type automobile composite material die-formed piece to the reference axis of the hole type automobile composite material die-formed piece can be obtained.

The second technical scheme for achieving the purpose of the invention is that the method for measuring the position tolerance of the hole type automobile composite material molded part to the reference shaft is characterized in that the position tolerance is perpendicularity, and the specific method is that ① is provided with a sensor measuring assembly and a laser measuring assembly, wherein the sensor measuring assembly comprises a first measuring seat and four first supports fixedly arranged below the first measuring seatThe laser measuring assembly comprises a second measuring seat, four second support legs fixedly arranged below the second measuring seat, a second ball arranged at the bottom end of each second support leg and fixedly arranged above the second measuring seat, and two lasers fixedly arranged above the second measuring seat, wherein the spherical centers of the four second ball are connected to form a rectangle R ', the PSD sensor array is composed of a plurality of PSD sensors with photosensitive surfaces located in the same plane, the photosensitive surfaces of all the PSD sensors are perpendicular to the rectangle R and parallel to the same side of the rectangle R, the relative position relation between the photosensitive surfaces of all the PSD sensors and the four first balls is measured and recorded as S, the laser measuring assembly comprises a second measuring seat, four second support legs fixedly arranged below the second measuring seat, a second ball arranged at the bottom end of each second support leg, and two lasers fixedly arranged above the second measuring seat, the spherical centers of the four second balls are connected to form a rectangle R', the two laser axes emitted by the two lasers are parallel to the same side of the rectangle R ', the planes of the two parallel laser axes are parallel to the rectangle R', the planes of the two laser axes emitted by the two lasers are measured and are symmetrical to the outer surface of the reference seat, the two laser axes are recorded as V, the reference axes ②, the reference axes are arranged on the outer surface of the reference seat, and the reference seat, the reference axis of the two laser measuring seat, the reference axisTwo areAnIntersection line of symmetrical inclined planesParallel to the axis of the reference shaft; a reference PSD sensor array with a photosensitive surface facing the reference shaft is fixedly arranged on one side of the V-shaped reference seat through a reference support；The reference PSD sensor array consists of a plurality of reference PSD sensors with photosensitive surfaces located in the same plane; all reference PSD sensor photosurfaces are perpendicular to the V-shaped reference seatTwo areAnThe intersection line of the symmetrical inclined planes;measuring the relative position relation of the photosensitive surfaces of all the reference PSD sensors and recording as S0; two second lasers to be tested are arranged above the V-shaped reference base through a second bracket, the second bracket comprises a movable L rod and a second bracket, the second bracket is arranged at the top of the movable L rod, and the axis of the second bracket is parallel to the V-shaped reference baseTwo areAnIntersection line of symmetrical inclined planesThe transverse axis of (a); the two second lasers to be tested are arranged onThe method comprises the steps of measuring the distance between two laser axes emitted by two lasers to be measured, wherein the two laser axes are parallel, the plane where the two parallel laser axes are located is perpendicular to the axis of a cross shaft, measuring the distance between the two laser axes emitted by the two lasers to be measured, and marking the distance as L2, placing ③ a laser measuring assembly outside a reference shaft, enabling the emitting directions of the two lasers to face a reference PSD sensor array, enabling four second spheres to be in full four-point contact with the outer surface of the reference shaft for the first time, and marking the measuring position as X1-Y1, wherein X1 represents the axial position of the measuring position, Y1 represents the circumferential position of the measuring position, and rotating the two laser axes emitted by the two lasers to be measuredTwo are providedThe method comprises the steps of fully opening lasers, sensing by a reference PSD sensor on a reference PSD sensor array to obtain two laser sensing points, obtaining space position data X1-Y1 of the four second spheres at the measuring position outside a reference shaft by S0 and L, repeating step ③ by ④ to obtain space position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) of a plurality of circumferential positions of the four second spheres at a plurality of axial positions outside the reference shaft, placing a sensor measuring assembly in the hole type automobile composite material die forming piece by ⑤, enabling the PSD sensor array to face the two second lasers to be measured, enabling the four first spheres to be in full four-point contact with the inner surface of the hole type automobile composite material die forming piece for the first time, and marking the measuring position as XX1-YY1, wherein XX1 represents the axial position of the measuring position, YY1 represents the circumferential position of the measuring position, and XX represents the circumferential position of the measuring position of the hole type automobile composite material forming pieceTwo are providedThe second lasers to be tested are all opened, the movable L rod is moved, the two second lasers to be tested are rotated, when the PSD sensors on the PSD sensor array sense the lasers emitted by the two second lasers to be tested and the distance between two laser sensing points is equal to L2, the movement and the rotation are stopped, spatial position data XX1-YY1 of the measuring positions of the four first spheres in the hole type automobile composite material die-pressing forming piece can be obtained through the L2 and the S, and the step ⑤ is repeated through ⑥, so that the four first spheres in the hole type automobile composite material die-pressing forming piece can be obtainedSpatial position data XXi-YYj (i =1,2, … …, m; j =1,2, … …, n) of a plurality of circumferential positions at a plurality of axial positions in the material die-formed part, ⑦ processes all spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) and XXi-YYj (i =1,2, … …, m; j =1,2, … …, n), and thus the perpendicularity of the axis of the hole type automobile composite material die-formed part to the axis of the reference shaft can be obtained.

The third technical scheme is that the method for measuring the position tolerance of a hole type automobile composite material die-formed part to a reference axis is characterized in that ① is provided with a sensor measuring assembly and a laser measuring assembly, the sensor measuring assembly comprises a first measuring seat, four first supporting legs fixedly arranged below the first measuring seat, a first sphere arranged at the bottom end of each first supporting leg and a PSD sensor array fixedly arranged above the first measuring seat, the spherical centers of the four first spheres form a rectangle R, the PSD sensor array comprises PSD sensors with a plurality of photosensitive surfaces in the same plane, the photosensitive surfaces of all the PSD sensors are perpendicular to the rectangle R and parallel to the same side of the rectangle R, the relative position relation between the photosensitive surfaces of all the PSD sensors and the four first spheres is measured and marked as S, the laser measuring assembly comprises a second measuring seat, four second supporting legs fixedly arranged below the second measuring seat, a second sphere arranged at the bottom end of each second supporting leg and two laser measuring seats fixedly arranged above the rectangle R, the two laser measuring seats are connected with the outer surface of the rectangle R, the two laser measuring seats are arranged parallel to the outer surface of the rectangle R, the two reference axes of the two spheres are measured and marked as V', the two reference axes of the two laser measuring seats, the two spheres are arranged parallel to the outer surface of the two reference axes of the two laser measuring seats, the two reference axes of the two spheres are measured and the two reference axes of the two spheres are arranged parallel to the two reference axes of the two laser measuring seats, the two reference axes of the two spheres, the two spheres are arranged below the two reference axes of the two reference seats, the twoTwo areAnIntersection line of symmetrical inclined planesParallel to the axis of the reference shaft; a reference PSD sensor array with a photosensitive surface facing the reference shaft is fixedly arranged on one side of the V-shaped reference seat through a reference support；The reference PSD sensor array consists of a plurality of reference PSD sensors with photosensitive surfaces located in the same plane; all reference PSD sensor photosurfaces are perpendicular to the V-shaped reference seatTwo areAnThe intersection line of the symmetrical inclined planes;determining the relative position relation of all reference PSD sensor photosensitive surfaces and recording S0, arranging two third lasers to be measured above the V-shaped reference seat through a third support, wherein the third support comprises a movable L-shaped frame and an inclined shaft which is arranged at the top of the movable L-shaped frame and has an axis which is intersected with but not perpendicular to the bottom surface of the cuboid reference seat, the two third lasers to be measured are arranged at the end parts of the inclined shaft and can rotate around the axis of the inclined shaft, the two laser axes emitted by the two third lasers to be measured are parallel, the plane of the parallel laser axes is perpendicular to the axis of the inclined shaft, determining the distance between the two laser axes emitted by the two third lasers to be measured and recording the distance as L3, ③ placing the laser measuring assembly outside the reference shaft and enabling the emitting directions of the two reference PSD sensor arrays to face, simultaneously enabling the four second spheres to be in full contact with the outer surface of the reference shaft for the first time and recording the measuring position as L39X 34-Y1, wherein the axial position 1 and the circumferential position 1 of the measuring position 1Two are providedThe method comprises the steps of fully opening lasers, sensing by a reference PSD sensor on a reference PSD sensor array to obtain two laser sensing points, obtaining space position data X1-Y1 of the four second spheres at the measuring positions outside a reference shaft through S0 and L, repeating step ③ through ④ to obtain space position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) of the four second spheres at a plurality of circumferential positions outside the reference shaft at a plurality of axial positions, placing a sensor measuring assembly in a hole type automobile composite material die forming piece through ⑤, enabling the PSD sensor array to face two third lasers to be measured, and enabling the four first spheres to face the two third lasers to be measured at the same timeThe sphere and the inner surface of the hole type automobile composite material molded part realize four-point full contact for the first time, and the measuring position is marked as XX1-YY 1; where XX1 represents the axial position of the measurement location and YY1 represents the circumferential position of the measurement location; will be described inTwo are providedThe third lasers to be tested are all opened, the movable L rack is moved, the two third lasers to be tested are rotated, when the PSD sensors on the PSD sensor array sense the laser emitted by the two third lasers to be tested, the movement and the rotation are stopped, and when the spacing between two laser sensing points is equal to L3, the spatial position data XX1-YY1 of the measuring positions of the four first spheres in the hole type automobile composite material molded piece can be obtained through L3 and S, the step ⑤ is repeated through ⑥, the spatial position data XXi-YYj (i =1,2, … …, m; j =1,2, … …, n) of the four first spheres at a plurality of circumferential positions in a plurality of axial positions in the hole type automobile composite material molded piece can be obtained, the ⑦ carries out processing on the inclination of the hole type automobile composite material axis through all the reference spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) and XXi-YYj (i =1,2, … …, m; j =1,2, n; … …) of the hole type automobile composite material molded piece can be obtained through the inclination of the hole type automobile composite material molded piece.

The technical scheme for achieving the fourth purpose of the invention is that the position tolerance measuring method of the hole type automobile composite material die-formed part to the reference axis is adopted, the position tolerance is coaxiality, the specific method is that ① is provided with a sensor measuring assembly and a laser measuring assembly, the sensor measuring assembly comprises a first measuring seat, four first supporting legs fixedly arranged below the first measuring seat, a first sphere arranged at the bottom end of each first supporting leg and a PSD sensor array fixedly arranged above the first measuring seat, the sphere center connecting lines of the four first spheres form a rectangle R, the PSD sensor array is composed of PSD sensors with a plurality of photosensitive surfaces located in the same plane, the photosensitive surfaces of all the PSD sensors are perpendicular to the rectangle R and parallel to the same side of the rectangle R, the relative position relation between the photosensitive surfaces of all the PSD sensors and the four first spheres is measured, the position tolerance measuring assembly is recorded as S, and the laser measuring assembly comprises a plurality of PSD sensors with photosensitive surfaces located in the same planeThe device comprises a second measuring seat, four second support legs fixedly arranged below the second measuring seat, a second sphere arranged at the bottom end of each second support leg and two lasers fixedly arranged above the second measuring seat, wherein the spherical centers of the four second spheres are connected to form a rectangle R ', two laser axes emitted by the two lasers are parallel to the same side of the rectangle R ', the plane where the two parallel laser axes are located is parallel to the rectangle R ', the relative position relation between the two laser axes emitted by the two lasers and the four second spheres is measured and recorded as L, ② a V-shaped reference seat is arranged at one end of the outer surface of a reference shaft, two symmetrical inclined planes of the V-shaped reference seat are in contact with the outer surface of the reference shaft, and the two symmetrical inclined planes of the V-shaped reference seat are in contact with the outer surface of the reference shaftTwo areAnIntersection line of symmetrical inclined planesParallel to the axis of the reference shaft; a reference PSD sensor array with a photosensitive surface facing the reference shaft is fixedly arranged on one side of the V-shaped reference seat through a reference support；The reference PSD sensor array consists of a plurality of reference PSD sensors with photosensitive surfaces located in the same plane; all reference PSD sensor photosurfaces are perpendicular to the V-shaped reference seatTwo areAnThe intersection line of the symmetrical inclined planes;measuring the relative position relation of the photosensitive surfaces of all the reference PSD sensors and recording as S0; two emission directions facing to fourth lasers to be tested in hole type automobile composite material die-formed part are fixedly mounted on the other side of the V-shaped reference seat through two L-shaped supports, and two laser axes emitted by the two fourth lasers to be tested are parallel to the V-shaped reference seatTwo areAnIntersection line of symmetrical inclined planesThe method comprises the steps of measuring the distance between two laser axes emitted by two fourth lasers to be measured and recording the distance as L4, placing ③ a laser measuring assembly outside a reference shaft, enabling the emitting directions of the two lasers to face a reference PSD sensor array, enabling four second spheres to be in full contact with the outer surface of the reference shaft for the first time at four points, and recording the measuring position as X1-Y1, wherein X1 represents the axial position of the measuring position, Y1 represents the circumferential position of the measuring position, and enabling the measuring position to be in full contact with the outer surface of the reference shaft for the first time, wherein the X1 represents the axial position of the measuring position, and theTwo are providedThe lasers are all turned on and are controlled by the reference PSD sensor arraySensing by the upper reference PSD sensor to obtain two laser sensing points, obtaining spatial position data X1-Y1 of the four second spheres at the measuring position outside the reference shaft by the S0 and the L, repeating the step ③ by the ④, obtaining spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) of a plurality of circumferential positions of the four second spheres at a plurality of axial positions outside the reference shaft, placing the sensor measuring assembly in the hole type automobile composite material molded piece by the ⑤, enabling the PSD sensor array to face the two fourth lasers to be measured, enabling the four first spheres to be in full four-point contact with the inner surface of the hole type automobile composite material molded piece for the first time, and marking the measuring position as XX1-YY1, wherein XX1 represents the axial position of the measuring position, YY1 represents the circumferential position of the measuring position, and repeating the step ③Two are providedAnd (3) completely opening the fourth laser to be detected, sensing the fourth laser by a PSD sensor on the PSD sensor array to obtain two laser sensing points, and obtaining spatial position data XX1-YY1 of the measurement position of the four first spheres in the hole type automobile composite material die-formed piece by L4 and S, repeating step ⑤ by ⑥ to obtain spatial position data XXi-YYj (i =1,2, … …, m; j =1,2, … …, n) of a plurality of circumferential positions of the four first spheres at a plurality of axial positions in the hole type automobile composite material die-formed piece, and processing ⑦ all the spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) and XXi-YYj (i =1,2, … …, m; j =1,2, … …, n), so that the coaxiality of the axis of the hole type automobile composite material die-formed piece to the reference axis of the hole type automobile composite material die-formed piece can be obtained.

The invention has the following positive effects: the method for measuring the position tolerance of the hole type automobile composite material molded part to the reference shaft is simple and easy to master, the measuring efficiency is high, the measuring precision is accurate, and the measuring device is relatively simple in structure, easy to operate and low in price.

Drawings

Fig. 1 is a schematic structural diagram of a sensor measuring assembly of the present invention.

Fig. 2 is a left side view of fig. 1.

Fig. 3 is a schematic structural diagram of a laser measuring assembly according to the present invention.

Fig. 4 is a right side view of fig. 3.

Fig. 5 and 6 are schematic views of the parallelism measuring method of example 1.

Fig. 7 and 8 are schematic diagrams of the perpendicularity measuring method of embodiment 2.

Fig. 9 and 10 are schematic diagrams of the inclination measuring method of embodiment 3.

Fig. 11 is a schematic view of the coaxiality measuring method in embodiment 4.

Detailed Description

(example 1)

The embodiment is a method for measuring the parallelism of a hole type automobile composite material molded forming part 2 to a reference shaft 1, and the method specifically comprises the following steps:

① has a sensor measuring assembly 4 and a laser measuring assembly 5.

Referring to fig. 1 and 2, the sensor measuring assembly 4 includes a first measuring seat 41, four first legs 42 fixedly mounted below the first measuring seat 41, a first sphere 43 disposed at a bottom end of each first leg 42, and a PSD sensor array 44 fixedly mounted above the first measuring seat 41.

The connecting lines of the centers of the four first spheres 43 form a rectangle R.

The PSD sensor array 44 is composed of a plurality of PSD sensors 44-1 (the specific number is only required to ensure that the PSD sensor array 44 can receive the laser emitted by the sensing laser when the sensor measuring component 4 moves along the circumferential direction in the hole type automobile composite material molded part 2, in this embodiment, the PSD sensor array is a 7 × 7 array) whose photosensitive surfaces are located in the same plane; the photosurfaces of all the PSD sensors 44-1 are perpendicular to the rectangle R and parallel to the same side of the rectangle R.

The relative positions of the photosensitive surfaces of all the PSD sensors 44-1 and the four first spheres 43 are measured and denoted by S.

Referring to fig. 3 and 4, the laser measuring assembly 5 includes a second measuring socket 51, four second legs 52 fixedly installed below the second measuring socket 51, a second ball 53 provided at a bottom end of each second leg 52, and two lasers 54 fixedly installed above the second measuring socket 51 by two laser brackets 50.

The connecting lines of the centers of the four second spheres 53 form a rectangle R'.

The two laser axes emitted by the two lasers 54 are both parallel to the same side of the rectangle R ', and the plane in which the two parallel laser axes lie is parallel to the rectangle R'.

The relative position of the two laser axes emitted by the two lasers 54 and the four second spheres 53 is determined and denoted as L.

② referring to FIG. 5, a V-shaped reference seat 3 is provided at one end of the outer surface of the reference shaft 1, the two symmetrical inclined surfaces 31 of the V-shaped reference seat 3 contact with the outer surface of the reference shaft 1, and the V-shaped reference seat 3Two areAnSymmetrical inclined plane31Cross line of3-1 are parallel to the axis of the reference shaft 1.

A reference PSD sensor array 70 with a photosensitive surface facing the reference axis 1 is fixedly arranged on one side of the V-shaped reference seat 3 through a reference bracket 60；The reference PSD sensor array 70 is composed of a plurality of reference PSD sensors 70-1 (the specific number is only required to ensure that the laser measuring components 5 can receive the laser emitted by the sensing laser when moving along the circumferential direction outside the reference axis 1, in this embodiment, 14 × 14 arrays) whose photosensitive surfaces are located in the same plane; all reference PSD sensors 70-1 having their photosensitive surfaces perpendicular to the V-shaped reference base 3Two areAnSymmetrical inclined plane31Cross line of3-1；The relative positions of the photosensitive surfaces of all the reference PSD sensors 70-1 are measured and recorded as S0.

Two first lasers 81 to be tested with the emission directions facing the hole type automobile composite material molded forming part 2 are fixedly installed on one side of the V-shaped reference seat 3 through two first supports 61, and two laser axes emitted by the two first lasers 81 to be tested are parallel to that of the V-shaped reference seat 3Two areAnSymmetrical inclined plane31Cross line 3-1 of(ii) a The distance between the two laser axes emitted by the two first lasers 81 to be measured is determined and is designated as L1.

③ referring to fig. 6, the laser measuring assembly 5 is placed outside the reference shaft 1 with the two lasers 54 emitting in the direction of the reference PSD sensor array 70, and the four second spheres 53 are brought into a first four-point full contact with the outer surface of the reference shaft 1, and the measuring positions are denoted as X1-Y1, where X1 denotes the axial position of the measuring position and Y1 denotes the circumferential position of the measuring position.

Will be provided withTwo are providedThe laser 54 is turned on and sensed by the reference PSD sensor 70-1 of the reference PSD sensor array 70 to obtain two laser sensing points, which is obtained from the above S0Two are providedFrom the circumferential position L and the axial position of the laser 54, spatial position data X1-Y1 of the four second spheres 53 at the measurement positions outside the reference axis 1 can be obtained.

④ the spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) of the four second spheres 53 at several circumferential positions outside the reference axis 1 can be obtained by repeating the step ③:

keeping the axial position X1 unchanged, moving the laser measuring assembly 5 along the circumferential direction, enabling four second spheres 53 to be in four-point full contact with the outer surface of the reference shaft 1 for the second time, and marking the measuring positions as X1-Y2; the two lasers 54 are all turned on, and are sensed by the reference PSD sensor 70-1 on the reference PSD sensor array 70 to obtain two laser sensing points, and spatial position data X1-Y2 of the four second spheres 53 at the measurement positions outside the reference axis 1 can be obtained from the above S0 and L.

And II, repeating the step I to obtain spatial position data X1-Yj (j =1,2, … …, n) of a plurality of circumferential positions of the four second spheres 53 at the axial position X1 outside the reference shaft 1.

And III, moving the laser measuring assembly 5 to an axial position X2 along the axial direction, and repeating the step of the axial position X1 to obtain spatial position data X2-Yj (j =1,2, … …, n) of a plurality of circumferential positions of the four second spheres 53 at the axial position X2 outside the reference shaft 1.

IV, the step III is repeated, and spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) of a plurality of circumferential positions of the four second spheres 53 at a plurality of axial positions outside the reference shaft 1 can be obtained.

⑤ referring to FIG. 6, the sensor measurement assembly 4 is placed in the hole type automotive composite molded part 2 with the PSD sensor array 44 facing the two first lasers 81 to be measured, while the four first spheres 43 make a first four-point full contact with the inner surface of the hole type automotive composite molded part 2 and the measurement positions are identified as XX1-YY1, where XX1 represents the axial position of the measurement position and YY1 represents the circumferential position of the measurement position.

Will be provided withTwo are providedThe first laser 81 to be measured is completely opened and is sensed by the PSD sensor 44-1 on the PSD sensor array 44 to obtain two laser sensing points, the circumferential position of the PSD sensor array 44 can be obtained from the L1, and the spatial position data XX1-YY1 of the four first spheres 43 at the measuring position in the hole type automobile composite material molded part 2 can be obtained from the S and the axial position.

⑥ the spatial position data XXi-YYj (i =1,2, … …, m; j =1,2, … …, n) for a number of circumferential positions of the four first spheres 43 at a number of axial positions within the aperture type automotive composite molded shape 2 is obtained by repeating step ⑤.

The method is described with reference to step ④.

⑦ all the spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) and XXi-YYj (i =1,2, … …, m; j =1,2, … …, n) are processed, and the parallelism of the axis 2-1 of the hole type automobile composite material molded article 2 to the axis 1-1 of the reference shaft 1 can be obtained.

(example 2)

The embodiment is a perpendicularity measuring method of a hole type automobile composite material molded forming part 2 to a reference shaft 1, and the method specifically comprises the following steps:

① A sensor measuring unit 4 and a laser measuring unit 5 are provided, as in embodiment 1.

② referring to FIG. 7, a V-shaped reference seat 3 is provided at one end of the outer surface of the reference shaft 1, the two symmetrical inclined surfaces 31 of the V-shaped reference seat 3 contact with the outer surface of the reference shaft 1, and the V-shaped reference seat 3Two areAnSymmetrical inclined plane31Cross line of3-1 are parallel to the axis of the reference shaft 1.

Through a reference support 60One side of the V-shaped reference seat 3 is fixedly provided with a reference PSD sensor array 70 with a photosensitive surface facing the reference shaft 1；The reference PSD sensor array 70 is composed of a plurality of (in this embodiment, 14 × 14) reference PSD sensors 70-1 whose photosensitive surfaces are located in the same plane; all reference PSD sensors 70-1 having their photosensitive surfaces perpendicular to the V-shaped reference base 3Two areAnSymmetrical inclined plane31Cross line of3-1；The relative positions of the photosensitive surfaces of all the reference PSD sensors 70-1 are measured and recorded as S0.

Two second lasers to be tested 82 are arranged above the V-shaped reference base 3 through a second bracket 62, the second bracket 62 comprises a movable L rod 62-1 and a second bracket 62 which is arranged on the top of the movable L rod 62-1 and has an axis parallel to the V-shaped reference base 3Two areAnSymmetrical inclined plane31Cross line ofTransverse axis 62-2 of 3-1; two second lasers to be tested 82 are arranged at the end part of the transverse shaft 62-2 and can rotate around the axis of the transverse shaft 62-2; the two laser axes emitted by the two second lasers to be tested 82 are parallel, and the plane where the two parallel laser axes are located is perpendicular to the axis of the transverse shaft 62-2; the spacing between the two laser axes emitted by the two second lasers under test 82 is measured and is designated as L2.

③ referring to fig. 8, the laser measuring assembly 5 is placed outside the reference shaft 1 with the two lasers 54 emitting in the direction of the reference PSD sensor array 70, and the four second spheres 53 are brought into a first four-point full contact with the outer surface of the reference shaft 1, and the measuring positions are denoted as X1-Y1, where X1 denotes the axial position of the measuring position and Y1 denotes the circumferential position of the measuring position.

④ the step ③ is repeated to obtain spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) of the four second spheres 53 at several circumferential positions outside the reference axis 1.

The specific procedure is the same as in example 1.

⑤ referring to fig. 8, the sensor measurement assembly 4 is placed in the hole type automotive composite molded part 2 with the PSD sensor array 44 facing the two second lasers 82 under test, while the four first spheres 43 make a first four-point full contact with the inner surface of the hole type automotive composite molded part 2 and the measurement positions are identified as XX1-YY1, where XX1 represents the axial position of the measurement position and YY1 represents the circumferential position of the measurement position.

Will be provided withTwo are providedThe second laser 82 to be measured is completely opened, the movable L-bar 62-1 is moved and the two second lasers 82 to be measured are rotated, when the PSD sensor 44-1 on the PSD sensor array 44 senses the laser light emitted by the two second lasers 82 to be measured and the distance between two laser sensing points is equal to L2, the movement and the rotation are stopped, and spatial position data XX1-YY1 of the four first spheres 43 at the measuring position in the hole type automobile composite material molded part 2 can be obtained by the above L2 and S.

The specific procedure is as in example 1.

⑦ all the spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) and XXi-YYj (i =1,2, … …, m; j =1,2, … …, n) are processed, and the perpendicularity of the axis 2-1 of the hole type automobile composite material molded article 2 to the axis 1-1 of the reference shaft 1 can be obtained.

(example 3)

The embodiment is a method for measuring the inclination of a hole type automobile composite material molded part 2 to a reference shaft 1, and the method specifically comprises the following steps:

② referring to FIG. 9, a V-shaped reference base 3 is provided at one end of the outer surface of the reference shaft 1, the two symmetrical inclined surfaces 31 of the V-shaped reference base 3 contact with the outer surface of the reference shaft 1, andof a V-shaped reference block 3Two areAnSymmetrical inclined plane31Cross line of3-1 are parallel to the axis of the reference shaft 1.

A reference PSD sensor array 70 with a photosensitive surface facing the reference axis 1 is fixedly arranged on one side of the V-shaped reference seat 3 through a reference bracket 60；The reference PSD sensor array 70 is composed of a plurality of (in this embodiment, 14 × 14) reference PSD sensors 70-1 whose photosensitive surfaces are located in the same plane; all reference PSD sensors 70-1 having their photosensitive surfaces perpendicular to the V-shaped reference base 3Two areAnSymmetrical inclined plane31Cross line of3-1；The relative positions of the photosensitive surfaces of all the reference PSD sensors 70-1 are measured and recorded as S0.

Two third lasers-to-be-tested 83 are arranged above the V-shaped reference seat 3 through a third bracket 63, wherein the third bracket 63 comprises a movable L-shaped frame 63-1 and an inclined shaft 63-2 which is arranged at the top of the movable L-shaped frame 63-1 and has an axis which is intersected with but not perpendicular to the bottom surface of the cuboid reference seat 3; the two third lasers to be tested 83 are arranged at the end part of the inclined shaft 63-2 and can rotate around the axis of the inclined shaft 63-2; the two laser axes emitted by the two third lasers to be tested 53 are parallel, and the plane where the two parallel laser axes are located is perpendicular to the axis of the inclined shaft 63-2; the distance between the two laser axes emitted by the two third lasers-under-test 83 is measured and recorded as L3.

③ referring to fig. 10, the laser measuring assembly 5 is placed outside the reference shaft 1 with the two lasers 54 emitting in the direction of the reference PSD sensor array 70, and the four second spheres 53 are brought into a first four-point full contact with the outer surface of the reference shaft 1, and the measuring positions are denoted as X1-Y1, where X1 denotes the axial position of the measuring position and Y1 denotes the circumferential position of the measuring position.

Will be provided withTwo are provided The laser 54 is turned on and sensed by the reference PSD sensor 70-1 of the reference PSD sensor array 70 to obtain two laser sensing points, which is obtained from the above S0Two are providedFrom the circumferential position L and the axial position of the laser 54, spatial position data X1-Y1 of the four second spheres 53 at the measurement positions outside the reference axis 1 can be obtained.

The specific procedure is the same as in example 1.

⑤ referring to fig. 10, the sensor measurement assembly 4 is placed in the hole type automotive composite molded part 2 with the PSD sensor array 44 facing the two third lasers 83 under test, while the four first spheres 43 make a first four-point full contact with the inner surface of the hole type automotive composite molded part 2 and the measurement positions are identified as XX1-YY1, where XX1 represents the axial position of the measurement position and YY1 represents the circumferential position of the measurement position.

Will be provided withTwo are providedThe third laser device 83 to be measured is completely opened, the movable L-frame 63-1 is moved and the two third laser devices 83 to be measured are rotated, when the PSD sensor 44-1 on the PSD sensor array 44 senses the laser light emitted by the two third laser devices 83 to be measured and the distance between the two laser sensing points is equal to L3, the movement and the rotation are stopped, and spatial position data XX1-YY1 of the four first spheres 43 at the measuring position in the hole type automobile composite material molded part 2 can be obtained by the above L3 and S.

The specific procedure is as in example 1.

⑦ processes all the spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) and XXi-YYj (i =1,2, … …, m; j =1,2, … …, n), and the inclination of the axis 2-1 of the hole-type automobile composite material molded article 2 to the axis 1-1 of the reference shaft 1 can be obtained.

(example 4)

The embodiment is a method for measuring the coaxiality of a hole type automobile composite material molded forming part 2 to a reference shaft 1, and the method specifically comprises the following steps:

① A sensor measuring unit 4 and a laser measuring unit 5 are provided, wherein the laser measuring unit 5 is the same as that of embodiment 1, and the sensor measuring unit 4 is substantially the same as that of embodiment 1 except that the PSD sensor array 44 is an 11X 11 array.

② referring to FIG. 11, a V-shaped reference base 3 is provided at one end of the outer surface of the reference shaft 1, the two symmetrical inclined surfaces 31 of the V-shaped reference base 3 contact with the outer surface of the reference shaft 1, and the V-shaped reference base 3Two areAnSymmetrical inclined plane31Cross line of3-1 are parallel to the axis of the reference shaft 1.

A reference PSD sensor array 70 with a photosensitive surface facing the reference axis 1 is fixedly arranged on one side of the V-shaped reference seat 3 through a reference bracket 60；The reference PSD sensor array 70 is composed of a plurality of (in this embodiment, 18 × 18 arrays) reference PSD sensors 70-1 whose photosensitive surfaces are located in the same plane; all reference PSD sensors 70-1 having their photosensitive surfaces perpendicular to the V-shaped reference base 3Two areAnSymmetrical inclined plane31Cross line of3-1；The relative positions of the photosensitive surfaces of all the reference PSD sensors 70-1 are measured and recorded as S0.

The two fourth lasers 84 to be tested which are emitted towards the inside of the hole type automobile composite material molded part 2 in the two emission directions are fixedly installed on the other side of the V-shaped reference seat 3 through the two fourth supports 64, and the two laser axes emitted by the two fourth lasers 84 to be tested are parallel to the V-shaped reference seat 3Two areAnSymmetrical inclined plane31Cross line 3-1 of(ii) a The distance between the two laser axes emitted by the two fourth lasers under test 84 is measured and recorded as L4.

③ referring to FIG. 11, the laser measuring assembly 5 is placed outside the reference shaft 1 with the two lasers 54 emitting in the direction of the reference PSD sensor array 70, while the four second spheres 53 make a first four-point full contact with the outer surface of the reference shaft 1 and the measuring position is denoted as X1-Y1, where X1 denotes the axial position of the measuring position and Y1 denotes the circumferential position of the measuring position.

Will be provided withTwo are provided The laser 54 is turned on and sensed by the reference PSD sensor 70-1 of the reference PSD sensor array 70 to obtain two laser sensing points, which is obtained from the above S0Two are providedFrom the circumferential position L and the axial position L of the laser 54, spatial position data X1-Y of the four second spheres 53 at the measurement position outside the reference axis 1 can be obtained1。

The specific procedure is the same as in example 1.

⑤ referring to FIG. 11, the sensor measurement assembly 4 is placed in the hole type automotive composite molded part 2 with the PSD sensor array 44 facing the two fourth lasers 84 under test, while the four first spheres 43 make a first four-point full contact with the inner surface of the hole type automotive composite molded part 2 and the measurement positions are identified as XX1-YY1, where XX1 represents the axial position of the measurement position and YY1 represents the circumferential position of the measurement position.

Will be provided withTwo are providedThe fourth laser 84 to be measured is completely opened and is sensed by the PSD sensor 44-1 on the PSD sensor array 44 to obtain two laser sensing points, and spatial position data XX1-YY1 of the four first spheres 43 at the measuring position in the hole type automobile composite material molded part 2 can be obtained from the above L4 and S.

The specific procedure is as in example 1.

⑦ all the spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) and XXi-YYj (i =1,2, … …, m; j =1,2, … …, n) are processed, and the coaxiality of the axis 2-1 of the hole type automobile composite material molded article 2 to the axis 1-1 of the reference shaft 1 can be obtained.

Claims

1. A method for measuring the position tolerance of a hole type automobile composite material molded part to a reference shaft is disclosed, wherein the position tolerance is parallelism, and the method comprises the following steps:

① is provided with a sensor measuring component (4) and a laser measuring component (5);

the sensor measuring assembly (4) comprises a first measuring seat (41), four first supporting feet (42) fixedly arranged below the first measuring seat (41), a first ball body (43) arranged at the bottom end of each first supporting foot (42), and a PSD sensor array (44) fixedly arranged above the first measuring seat (41); the connecting lines of the centers of the four first spheres (43) form a rectangle R; the PSD sensor array (44) consists of a plurality of PSD sensors (44-1) with photosensitive surfaces located in the same plane; all the photosensitive surfaces of the PSD sensors (44-1) are perpendicular to the rectangle R and parallel to the same side of the rectangle R; measuring the relative position relation between the photosensitive surfaces of all the PSD sensors (44-1) and the four first spheres (43), and recording as S;

the laser measuring assembly (5) comprises a second measuring seat (51), four second supporting legs (52) fixedly arranged below the second measuring seat (51), a second ball body (53) arranged at the bottom end of each second supporting leg (52) and two lasers (54) fixedly arranged above the second measuring seat (51); the sphere centers of the four second spheres (53) are connected to form a rectangle R'; two laser axes emitted by the two lasers (54) are parallel to the same edge of the rectangle R ', and the plane where the two parallel laser axes are located is parallel to the rectangle R'; measuring the relative position relation between two laser axes emitted by two lasers (54) and the four second spheres (53), and recording as L;

② a V-shaped reference seat (3) is arranged at one end of the outer surface of the reference shaft (1);

two symmetrical inclined planes (31) of the V-shaped reference seat (3) are in contact with the outer surface of the reference shaft (1), and the V-shaped reference seat (3)Two areAnSymmetrical inclined plane（31）Intersecting line of (3-1)Parallel to the axis of the reference shaft (1);

a reference PSD sensor array (70) with a photosensitive surface facing the reference shaft (1) is fixedly arranged on one side of the V-shaped reference base (3) through a reference support (60)；The reference PSD sensor array (70) is formed by a plurality of photosensitive surfaces positioned in the same planeThe reference PSD sensor (70-1); all reference PSD sensors (70-1) have light-sensitive surfaces perpendicular to the V-shaped reference seat (3)Two areAnSymmetrical inclined plane（31）The intersection line (3-1);measuring the relative position relation of the photosensitive surfaces of all the reference PSD sensors (70-1) and recording as S0;

through two first supports (61) be in two emission directions of V type reference seat (3) one side fixed mounting face first waiting to survey laser instrument (81) in hole class car combined material moulded part (2), two laser axes that two first waiting to survey laser instrument (81) emitted all are on a parallel with V type reference seat (3)'s two laser axisTwo areAnSymmetrical inclined plane（31）Intersecting line of (3-1)(ii) a Measuring the distance between the two laser axes emitted by the two first lasers (81) to be measured, and recording the distance as L1;

③, placing the laser measuring component (5) outside the reference shaft (1) and making the emission directions of the two lasers (54) face the reference PSD sensor array (70), simultaneously making the four second spheres (53) realize a first four-point full contact with the outer surface of the reference shaft (1) and marking the measuring position as X1-Y1, wherein X1 represents the axial position of the measuring position, and Y1 represents the circumferential position of the measuring position;

will be described inTwo are providedThe lasers (54) are all opened, the lasers are sensed by the reference PSD sensor (70-1) on the reference PSD sensor array (70) to obtain two laser sensing points, and spatial position data X1-Y1 of the measuring positions of the four second spheres (53) outside the reference axis (1) can be obtained through the S0 and the L;

④ repeating the step ③, so as to obtain spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) of a plurality of circumferential positions of the four second spheres (53) at a plurality of axial positions outside the reference axis (1);

⑤ placing the sensor measuring assembly (4) in the hole type automobile composite material molded piece (2) and making the PSD sensor array (44) face the two first lasers (81) to be measured, and simultaneously making the four first spheres (43) realize a first four-point full contact with the inner surface of the hole type automobile composite material molded piece (2) and marking the measuring position as XX1-YY1, wherein XX1 represents the axial position of the measuring position, and YY1 represents the circumferential position of the measuring position;

will be described inTwo are providedThe first laser (81) to be measured is completely opened and is sensed by a PSD sensor (44-1) on the PSD sensor array (44) to obtain two laser sensing points, and spatial position data XX1-YY1 of the four first spheres (43) at the measuring position in the hole type automobile composite material molded part (2) can be obtained through the L1 and the S;

⑥ repeating step ⑤, obtaining spatial position data XXi-YYj (i =1,2, … …, m; j =1,2, … …, n) of the four first spheres (43) at a plurality of circumferential positions at a plurality of axial positions within the aperture-type automotive composite molded article (2);

⑦ all the spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) and XXi-YYj (i =1,2, … …, m; j =1,2, … …, n) are processed, and the parallelism of the axis (2-1) of the hole type automobile composite material molded piece (2) to the axis (1-1) of the reference shaft (1) can be obtained.

2. A method for measuring the position tolerance of a hole type automobile composite material molded part to a reference shaft is disclosed, wherein the position tolerance is perpendicularity, and the method comprises the following specific steps:

a reference PSD sensor array (70) with a photosensitive surface facing the reference shaft (1) is fixedly arranged on one side of the V-shaped reference base (3) through a reference support (60)；The reference PSD sensor array (70) consists of a plurality of reference PSD sensors (70-1) with photosensitive surfaces located in the same plane; all reference PSD sensors (70-1) have light-sensitive surfaces perpendicular to the V-shaped reference seat (3)Two areAnSymmetrical inclined plane（31）The intersection line (3-1);measuring the relative position relation of the photosensitive surfaces of all the reference PSD sensors (70-1) and recording as S0;

two second lasers (82) to be tested are arranged above the V-shaped reference base (3) through a second support (62), and the second support (62)Comprises a movable L-shaped rod (62-1) and a V-shaped reference seat (3) which is arranged on the top of the movable L-shaped rod (62-1) and has an axis parallel to the V-shaped reference seatTwo areAnSymmetrical inclined plane（31）Cross line ofThe horizontal axis (62-2) of (3-1); the two second lasers under test (82) are arranged at the end part of the transverse shaft (62-2) and can rotate around the axis of the transverse shaft (62-2); the two laser axes emitted by the two second lasers (82) to be tested are parallel, and the plane where the two parallel laser axes are located is perpendicular to the axis of the transverse shaft (62-2); measuring the distance between the two laser axes emitted by the two second lasers (82) to be measured, and recording as L2;

⑤ placing the sensor measuring component (4) in the hole type automobile composite material molded piece (2) and making the PSD sensor array (44) face the two second lasers (82) to be measured, simultaneously making the four first spheres (43) realize a first four-point full contact with the inner surface of the hole type automobile composite material molded piece (2), and marking the measuring position as XX1-YY1, wherein XX1 represents the axial position of the measuring position, and YY1 represents the circumferential position of the measuring position;

will be described inTwo are providedWhen the PSD sensor (44-1) on the PSD sensor array (44) senses laser emitted by the two second lasers to be tested (82) and the distance between two laser sensing points is equal to L2, stopping moving and rotating, and obtaining spatial position data XX1-YY1 of the four first spheres (43) at the measuring position in the hole type automobile composite material molded part (2) through L2 and S;

⑦ all the spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) and XXi-YYj (i =1,2, … …, m; j =1,2, … …, n) are processed, and the perpendicularity of the axis (2-1) of the hole type automobile composite material molded part (2) to the axis (1-1) of the reference shaft (1) can be obtained.

3. A method for measuring the position tolerance of a hole type automobile composite material molded part to a reference shaft is disclosed, wherein the position tolerance is inclination, and the method comprises the following steps:

arranging two third lasers (83) to be tested above the V-shaped reference seat (3) through a third bracket (63), wherein the third bracket (63) comprises a movable L-shaped frame (63-1) and an inclined shaft (63-2) which is arranged at the top of the movable L-shaped frame (63-1) and has an axis which is intersected with but not perpendicular to the bottom surface of the cuboid reference seat (3); the two third lasers to be tested (83) are arranged at the end part of the inclined shaft (63-2) and can rotate around the axis of the inclined shaft (63-2); the two laser axes emitted by the two third lasers to be tested (53) are parallel, and the plane where the two parallel laser axes are located is perpendicular to the axis of the inclined shaft (63-2); measuring the distance between the two laser axes emitted by the two third lasers (83) to be measured, and recording as L3;

⑤ placing the sensor measuring component (4) in the hole type automobile composite material molded piece (2) and making the PSD sensor array (44) face the two third lasers (83) to be measured, and simultaneously making the four first spheres (43) realize a first four-point full contact with the inner surface of the hole type automobile composite material molded piece (2) and marking the measuring position as XX1-YY1, wherein XX1 represents the axial position of the measuring position, and YY1 represents the circumferential position of the measuring position;

will be described inTwo are providedThe third lasers (83) to be tested are all opened, the movable L-shaped frame (63-1) is moved, the two third lasers (83) to be tested are rotated, when the PSD sensors (44-1) on the PSD sensor array (44) sense the lasers emitted by the two third lasers (83) to be tested and the distance between two laser sensing points is equal to L3, the movement and the rotation are stopped, and spatial position data XX1-YY1 of the four first spheres (43) at the measuring position in the hole type automobile composite material die-molded part (2) can be obtained through the L3 and the S;

⑦ processes all the spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) and XXi-YYj (i =1,2, … …, m; j =1,2, … …, n), and the inclination of the axis (2-1) of the hole type automobile composite material molded article (2) to the axis (1-1) of the reference shaft (1) can be obtained.

4. A method for measuring the position tolerance of a hole type automobile composite material molded part to a reference shaft is disclosed, wherein the position tolerance is coaxiality, and the method comprises the following specific steps:

two L-shaped brackets (64) are fixedly arranged on the other side of the V-shaped reference seat (3) and two emission directions of the two emission directions face the hole type automobile composite material molded part (2)) The two laser axes emitted by the two fourth lasers (84) to be tested are parallel to the V-shaped reference base (3)Two areAnSymmetrical inclined plane（31）Intersecting line of (3-1)(ii) a Measuring the distance between the two laser axes emitted by the two fourth lasers (84) to be measured, and recording as L4;

⑤ placing the sensor measuring assembly (4) in the hole type automobile composite material molded piece (2) and making the PSD sensor array (44) face the two fourth lasers (84) to be measured, and simultaneously making the four first spheres (43) realize a first four-point full contact with the inner surface of the hole type automobile composite material molded piece (2) and marking the measuring position as XX1-YY1, wherein XX1 represents the axial position of the measuring position, and YY1 represents the circumferential position of the measuring position;

will be described inTwo are providedThe fourth laser (84) to be tested is completely opened and is sensed by a PSD sensor (44-1) on the PSD sensor array (44) to obtain two laser sensing points, namely L4 and SObtaining spatial position data XX1-YY1 of the four first spheres (43) at the measuring position in the hole-type automobile composite molded piece (2);

⑦ all the spatial position data Xi-Yj (i =1,2, … …, m; j =1,2, … …, n) and XXi-YYj (i =1,2, … …, m; j =1,2, … …, n) are processed, and the coaxiality of the axis (2-1) of the hole type automobile composite material molded piece (2) to the axis (1-1) of the reference shaft (1) can be obtained.