CN209541664U - A kind of calibration test specimen of direct-injection type dot laser Three-coordinate measurer - Google Patents

Abstract

The utility model discloses a kind of calibration test specimen of direct-injection type dot laser Three-coordinate measurer, is made of seven function shaft parts on same axis: demarcating shaft part including two rotary table installation positioning shaft parts, two cylinder verification shaft parts, two eccentric cylinder verification shaft parts, a measurement coordinate systems；Rotary table installation positioning shaft part mainly includes standard ball taper hole seat and the installation setting circle conical surface；Measuring coordinate system calibration shaft part includes centering plane, vertical cascaded surface, laterally-graded face, " ten " word slot.In direct-injection type dot laser Three-coordinate measurer calibration process, which can be effectively suppressed the influence of the depth of field and error of tilt to stated accuracy in laser triangulation, and detect pitching and the Run-out error of laser sensor installation；The standard ball taper hole seat of rotary table installation positioning shaft part can place standard ball, demarcate for Contacting three coordinates measurement machine to calibration element；The detection that cylinder verification shaft part and eccentric cylinder verification shaft part can be used for coordinate system calibration validity determines.

Description

Calibration specimen of a direct point laser three-coordinate measuring device

technical field

The invention relates to a calibration test piece of a non-contact detection device, in particular to a calibration test piece of a direct point laser three-coordinate measuring device

Background technique

Before the three-coordinate measuring device detects the part for the first time, the three-coordinate measuring device needs to be calibrated, and the calibration accuracy of the measuring coordinate system of the testing device directly affects the accuracy of the measured value of the part detection. The traditional contact three-coordinates is calibrated with a standard sphere, but in the direct-ray point laser three-coordinates measurement, compared with the calibration method of the measurement coordinate system using a standard sphere, the application of this calibration specimen can effectively suppress the depth of field error in laser triangulation optical measurement Influence of inclination error on calibration accuracy.

Although the patent CN201820375099 can calibrate the measurement coordinate system, the calibration part uses a cylindrical surface for radial positioning, and its installation fit clearance will affect the coincidence of the axis of the calibration part and the axis of the turntable, and will introduce additional system errors during the measurement process; It has no step surface feature, and it cannot test and verify the correctness of the direct point laser pose, which will lead to uncertainty in the measured value; its installation and positioning method is only suitable for the form with cylindrical holes on the turntable, and cannot adapt to common rotary axes The apex positioning method; it does not have a symmetrically distributed calibration characteristic domain, and cannot adapt to possible interference conditions in the measurement device.

Contents of the invention

The invention provides a calibration sample of a direct-ray point laser three-coordinate measuring device.

The two positioning axis sections of the circular table are respectively located at the two ends of the calibration piece, and are symmetrical about the plane of the XOY coordinate system of the test piece. The positioning axis section I of the circular table includes a standard spherical cone hole seat I (101) and a standard spherical cone hole on the positioning conical surface. Seat I (102); circular table positioning shaft section II includes standard ball cone hole seat standard ball cone hole seat II (201) and positioning conical surface II (202), standard ball cone hole seat I (101), standard ball cone hole seat II (201) are all conical countersinks, used for positioning and top positioning of standard balls, and their axes coincide with the Z-axis of the calibration specimen coordinate system; the positioning conical surface I (102) and the positioning conical surface II (202) are The radial and axial positioning installation surfaces of the calibration test piece when the coordinate system is calibrated in the detection device, the axes of the positioning conical surface I (102) and the positioning conical surface II (202) coincide with the Z axis of the calibration test piece coordinate system, The distance between the plane where the large end of the positioning conical surface I (102) and the positioning conical surface II (202) are located and the XOY reference plane of the specimen coordinate system is a known fixed value.

The two eccentric cylinder calibration axis sections are respectively located at the outer ends of the two cylinder calibration axis sections, and are symmetrical about the plane of the XOY coordinate system of the test piece. The two eccentric cylinder calibration axis sections are respectively composed of eccentric cylinder surface I (103), The eccentric cylindrical surface II (203) is used as a detection verification characteristic surface or a measurement verification characteristic surface for calibration of the coordinate system.

The two cylinder calibration axis sections are respectively located at the outer ends of the coordinate system calibration axis section, and are symmetrical about the plane of the XOY coordinate system of the test piece. The two cylinder calibration axis sections are respectively composed of cylindrical surface I (104), cylindrical surface II (204 ) form, as the detection and verification characteristic surface of the coordinate system calibration.

Described coordinate system demarcates shaft segment by horizontal step surface (105), (106), (107), vertical step surface (205), (206), (207), " ten " word groove (108), alignment plane (208); the transverse step surfaces (105), (106), (107) and the alignment plane (208) are perpendicular to each other, and are all parallel to the Z-axis of the test piece coordinate system, and the Z-axis of the test piece coordinate system reaches the horizontal step The distance between the plane (105) and the alignment plane (208) is equal and known, and the relative distance between the transverse step surfaces (105), (106), (107) is known. 105), (106), and (107) during the detection process, if the direct point laser has a pitch angle, the reading difference of the direct point laser on the three step surfaces will not be equal to the known design value between the step surfaces , thus reflecting the pitch angle of the measuring head; the vertical step surfaces (205), (206), (207) and the alignment plane (208) are perpendicular to each other, and are all parallel to the Z-axis of the specimen coordinate system, and the specimen coordinate system The distances from the Z axis to the vertical step surface (205) and the alignment plane (208) are equal and known, and the relative distances between the vertical step surfaces (205), (206), and (207) are known. During the detection process of the point laser on the vertical step surfaces (205), (206), (207), if the direct point laser has a deflection angle, the reading difference of the direct point laser on the three step surfaces will be the same as that of the step The known design values between the planes are not equal, which reflects the deflection angle of the probe and provides a reference for the attitude adjustment of the probe; the "ten" groove (108) is located opposite to the alignment plane (208), and the "ten" The cross-section of the word groove (108) is rectangular, and the "ten" groove (108) is symmetrical about the XOZ plane of the specimen coordinate system, the horizontal groove and the vertical groove of the "ten" groove (108) are perpendicular to each other, and the "ten" The symmetry plane of the horizontal groove of the word groove (108) coincides with the XOY plane of the test piece coordinate system, and the vertical groove and the right-angled edge of the horizontal groove of the "ten" groove (108) respectively constitute the Y-axis and the Z-axis linear zero of the coordinate system of the measuring device. The calibration feature of the position, in the direct-ray point laser detection process, the right-angled edge causes a sudden change in the direct-ray point laser measurement value, thereby reflecting the position of the direct-ray point laser in the coordinate system of the measuring device; the alignment plane (208) is the measuring device The X-axis linear zero position calibrates the characteristic surface, and assists in the alignment of the calibration parts.

The width of the "ten" groove (108) is greater than the maximum spot size within the effective range of the direct-point laser.

The origin of the coordinate system of the test piece is on the cylindrical surface I

(104), the intersection point of the horizontal symmetry plane of the cylindrical surface II (204) axis and the "ten" groove (108).

The beneficial effects of the present invention are: using the "ten" groove (108) and the alignment plane (208) to replace the standard ball for calibration can effectively suppress the influence of the depth of field error and the inclination error on the calibration accuracy in the laser triangulation optical measurement, " The sudden change of the right-angled edge formed by the "ten" groove (108) is also conducive to the accuracy of calibration; the standard spherical cone hole seat I (101) and the standard spherical cone hole seat II (201) on the positioning shaft section of the circular table can be used for The three-coordinate measuring machine can calibrate the accuracy of the calibration piece and can also be used for the clamping form of double-top positioning; the positioning cone surface I (102) and the positioning cone surface II (202) are used for radial and axial positioning, which can ensure the calibration piece. The coincidence of the axis and the axis of the turntable can reduce the system error; the horizontal step surface (105), (106), (107) and the vertical step surface (205), (206), (207) can control the position and orientation of the laser probe Perform detection to assist its pose adjustment; adopt symmetrically distributed calibration feature structure, which can adapt to possible interference conditions in the measurement device.

Description of drawings

Fig. 1 is an axonometric view I of a calibration test piece of a direct-ray point laser three-coordinate measuring device, and Fig. 2 is an axonometric view II of a calibration test piece of a direct-beam point laser three-coordinate measuring device.

The icons are marked as: 101-standard spherical taper seat I, 201-standard spherical taper seat II, 102-locating conical surface I, 202-locating conical surface II, 103-eccentric cylindrical surface I, 203-eccentric cylindrical surface II , 104-cylindrical surface I, 204-cylindrical surface II, 105,106,107-horizontal step surface, 205,206,207-vertical step surface, 108-alignment plane, 208-"ten" groove.

Detailed ways

Preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawings;

A calibration test piece of a laser triangulation optical detection device, comprising: two circular table positioning shaft sections, two cylinder calibration shaft sections, two eccentric cylinder calibration shaft sections, and one coordinate system calibration shaft section.

The two circular table positioning axis sections are respectively located at the two ends of the calibration piece, and are symmetrical about the plane of the XOY coordinate system of the test piece. The circular table positioning axis section I includes a standard spherical cone hole seat I (101) and a positioning conical surface II (102) ;Conical table positioning shaft section II includes standard spherical cone hole seat I (201) and positioning conical surface II (202). Spherical taper seat I (101) and standard spherical taper seat II (201) are both conical counterbores, which are used for placement and positioning of standard balls and apex positioning, and their axis coincides with the Z axis of the calibration specimen coordinate system; The surface I (102) and the positioning conical surface II (202) are the radial and axial positioning installation surfaces of the calibration test piece when the coordinate system is calibrated in the detection device, and the positioning conical surface I (102) and the positioning conical surface II The (202) axis coincides with the Z-axis of the calibration test piece coordinate system, and the distance between the plane where the large end of the positioning conical surface I (102) and the positioning conical surface II (202) is located and the XOY reference plane of the test piece coordinate system is a known fixed value.

The two eccentric cylinder calibration axis sections are respectively located at the outer ends of the two cylinder calibration axis sections, and are symmetrical about the plane of the XOY coordinate system of the test piece. The two eccentric cylinder calibration axis sections are respectively composed of eccentric cylinder surface I (103), The eccentric cylindrical surface II (203) is used as a detection verification characteristic surface or a measurement verification characteristic surface for calibration of the coordinate system.

The two cylinder calibration axis sections are respectively located at the outer ends of the coordinate system calibration axis section, and are symmetrical about the plane of the XOY coordinate system of the test piece. The two cylinder calibration axis sections are respectively composed of cylindrical surface I (104), cylindrical surface II (204 ) form, as the detection and verification characteristic surface of the coordinate system calibration.

Described coordinate system demarcates shaft segment by horizontal step surface (105), (106), (107), vertical step surface (205), (206), (207), " ten " word groove (108), alignment plane (208); the transverse step surfaces (105), (106), (107) and the alignment plane (208) are perpendicular to each other, and are all parallel to the Z-axis of the test piece coordinate system, and the Z-axis of the test piece coordinate system reaches the horizontal step The distance between the plane (105) and the alignment plane (208) is equal and known, and the relative distance between the transverse step surfaces (105), (106), (107) is known. 105), (106), and (107) during the detection process, if the direct point laser has a pitch angle, the reading difference of the direct point laser on the three step surfaces will not be equal to the known design value between the step surfaces , thus reflecting the pitch angle of the measuring head; the vertical step surfaces (205), (206), (207) and the alignment plane (208) are perpendicular to each other, and are all parallel to the Z-axis of the specimen coordinate system, and the specimen coordinate system The distances from the Z axis to the vertical step surface (205) and the alignment plane (208) are equal and known, and the relative distances between the vertical step surfaces (205), (206), and (207) are known. During the detection process of the point laser on the vertical step surfaces (205), (206), (207), if the direct point laser has a deflection angle, the reading difference of the direct point laser on the three step surfaces will be the same as that of the step The known design values between the planes are not equal, which reflects the deflection angle of the probe and provides a reference for the attitude adjustment of the probe; the "ten" groove (108) is located opposite to the alignment plane (208), and the "ten" The cross-section of the word groove (108) is rectangular, and the "ten" groove (108) is symmetrical about the XOZ plane of the specimen coordinate system, the horizontal groove and the vertical groove of the "ten" groove (108) are perpendicular to each other, and the "ten" The symmetry plane of the horizontal groove of the word groove (108) coincides with the XOY plane of the test piece coordinate system, and the vertical groove and the right-angled edge of the horizontal groove of the "ten" groove (108) respectively constitute the Y-axis and the Z-axis linear zero of the coordinate system of the measuring device. The calibration feature of the position, in the direct-ray point laser detection process, the right-angled edge causes a sudden change in the direct-ray point laser measurement value, thereby reflecting the position of the direct-ray point laser in the coordinate system of the measuring device; the alignment plane (208) is the measuring device The X-axis linear zero position calibrates the characteristic surface, and assists in the alignment of the calibration parts.

The width of the "ten" groove (108) is greater than the maximum spot size within the effective range of the direct-point laser.

The origin of the test piece coordinate system is at the intersection of the axes of the cylindrical surface I (104), cylindrical surface II (204) and the horizontal symmetry plane of the "cross" groove (108).

The above are only preferred embodiments of the present invention. All equivalent changes and improvements made according to the application scope of the present invention shall still fall within the scope of the patent of the present invention.

Claims (3)

1. a kind of calibration test specimen of direct-injection type dot laser Three-coordinate measurer, characterized in that it comprises: two rotary table installations Position shaft part, two eccentric cylinder verification shaft parts, two cylinder verification shaft parts, a coordinate systems calibration shaft part；

Described two rotary table positioning shaft parts are located at two ends of calibration element, and symmetrical about test specimen XOY coordinate plane, It includes standard ball taper hole seat I (101) and setting circle conical surface I (102) that rotary table, which positions shaft part I,；It includes standard that rotary table, which positions shaft part II, Ball taper hole seat II (201) and setting circle conical surface II (202), standard ball taper hole seat I (101), standard ball taper hole seat II (201) are Cone shaped countersink, for the placement positioning and top positioning of standard ball, axis is overlapped with calibration test specimen coordinate system Z axis；Setting circle Conical surface I (102), setting circle conical surface II (202) are the radial direction when calibration test specimen carries out coordinate system calibration in detection device With axially position mounting surface, setting circle conical surface I (102), setting circle conical surface II (202) axis and calibration test specimen coordinate system Z axis weight Close, the XOY datum level of setting circle conical surface I (102), plane where the setting circle conical surface II (202) big end and test specimen coordinate system away from From for known fixed；

Described two eccentric cylinder verification shaft parts are located at two cylinder verification shaft part outer ends, and about test specimen XOY coordinate It is that plane is symmetrical, two eccentric cylinder verification shaft parts are made of eccentric cylinder I (103), eccentric cylinder II (203) respectively, Detection verifying characteristic face or measurement verifying characteristic face as coordinate system calibration；

Described two cylinder verification shaft parts are located at coordinate system calibration shaft part outer end, and about test specimen XOY coordinate plane Symmetrically, two cylinder verification shaft parts are made of cylindrical surface I (104), cylindrical surface II (204) respectively, the inspection as coordinate system calibration Test characteristics of syndrome face；

Coordinate system calibration shaft part by laterally-graded face (105), (106), (107), vertical cascaded surface (205), (206), (207), " ten " word slot (108), centering plane (208) composition；Laterally-graded face (105), (106), (107) and centering plane (208) it is mutually perpendicular to, and is parallel to test specimen coordinate system Z axis, test specimen coordinate system Z axis to laterally-graded face (105) and centering are flat Face (208) be equidistant and it is known that laterally-graded face (105), (106), the relative distance between (107) it is known that in direct projection Formula dot laser is in laterally-graded face (105), (106), (107) detection process, if direct-injection type dot laser has pitch angle, Known designs value of the direct-injection type dot laser between the difference of reading and cascaded surface on three cascaded surfaces can be made unequal, to reflect The pitch angle of gauge head；Vertical cascaded surface (205), (206), (207) are mutually perpendicular to centering plane (208), and are parallel to Test specimen coordinate system Z axis, test specimen coordinate system Z axis to vertical cascaded surface (205) and centering plane (208) be equidistant and it is known that Vertical cascaded surface (205), (206), the relative distance between (207) are it is known that in direct-injection type dot laser to vertical cascaded surface (205), (206), in (207) detection process, if direct-injection type dot laser has deflection angle, direct-injection type dot laser can be made three Known designs value between difference of reading and cascaded surface on a cascaded surface is unequal, to reflect the deflection angle of gauge head, to survey Head pose adjustment provides reference；" ten " word slot (108) is located at centering plane (208) opposite, " ten " the word slot (108) it is transversal Face is rectangle, " ten " word slot (108) symmetrical, " ten " word slot (108) level trough and vertical slots about test specimen coordinate system XOZ plane It is mutually perpendicular to, and the plane of symmetry of " ten " word slot (108) level trough is overlapped with test specimen coordinate system XOY plane, " ten " word slot (108) Vertical slots and level trough rectangular edge respectively constitute measuring device coordinate system Y-axis, the calibration feature of z axis zero-bit, in direct projection In formula dot laser detection process, rectangular edge causes direct-injection type dot laser to measure value mutation, to reflect that direct-injection type dot laser exists Position in measuring device coordinate system；Centering plane (208) is the linear Zero positioning characteristic face of measuring device X-axis, auxiliary calibration Part centering.

2. a kind of calibration test specimen of direct-injection type dot laser Three-coordinate measurer according to claim 1, it is characterised in that " ten " word slot (108) width of rebate is greater than the maximum spot size in direct-injection type dot laser useful range.

3. a kind of calibration test specimen of direct-injection type dot laser Three-coordinate measurer according to claim 1, it is characterised in that The test specimen coordinate origin is in the horizontal symmetrical face of cylindrical surface I (104), cylindrical surface II (204) axis and " ten " word slot (108) Point of intersection.