Length measuring instrument YZ axis calibration gauge

Abstract

The utility model relates to the field of length measuring instrument calibration, in particular to a length measuring instrument YZ axis calibration gauge. The problem that YZ-axis displacement indication of an existing length measuring instrument cannot be accurately calibrated is solved. The utility model relates to a YZ axis calibration clamp for a length measuring instrument. The YZ axis calibration clamp comprises an n-shaped structural body, the n-shaped structural body is composed of a left side edge, a right side edge and a top face connected with the left side edge and the right side edge. The left side edge and the right side edge are respectively and horizontally provided with a coaxial through hole along the left-right direction, and the through holes are used as reference holes of the testing fixture. And a top surface through hole in a vertical direction is formed in the top surface. A locking screw used for fixing the clamp on an X-axis measuring column of a length measuring instrument is arranged on the side surface of the reference hole; and a locking screw for fixing the high-precision micrometer is arranged on the side surface of the top hole. The calibration gauge is simple, ingenious and reasonable in structure and convenient to use, can realize YZ-axis metering calibration of the length measuring instrument by combining with a corresponding calibration method, and comprehensively and accurately meters the metering characteristics of the length measuring instrument.

Description

Technical Field

[0001] The utility model relates to the field of length measuring instrument calibration, and particularly to a YZ-axis calibration fixture for a length measuring instrument. Background Art

[0002] A length measuring instrument is a multi-purpose high-precision metrological standard, used for measuring various precision parts and components as well as the verification of gauges and measuring tools, and is an essential instrument in metrological calibration laboratories and precision measurement workshops. In order to enable the length measuring instrument to achieve more types of calibration and meet a wider range of measurement requirements, on the basis of the original X-axis measurement implementation, some new length measuring instruments are also equipped with Z-axis or Y-axis indicators with grating scales, making the length measuring instrument gradually evolve from one-dimensional measurement (X-axis) to two-dimensional (XZ-axis) or three-dimensional (XYZ-axis) measurement, and adopting automatic control, further expanding the types of measured parts that can be measured by the length measuring instrument.

[0003] After consulting the literature, the existing metrological technical specifications mainly stipulate the metrological calibration method for the indication error of the X-axis of the length measuring instrument. There is no corresponding solution mentioned for the error measurement method of the indication value of the Z(Y)-axis of the current high-precision two-dimensional or three-dimensional length measuring instrument, making the accurate traceability of the value of this multi-dimensional indicating instrument blank, which affects the confirmation of the accuracy of the manufacturer's standards and the control of the accuracy during the use of the instrument by users. Summary of the Utility Model

[0004] The utility model provides a convenient and easy-to-use YZ-axis calibration fixture for a length measuring instrument to solve the problem that the Y / Z-axis displacement indication of the existing length measuring instrument cannot be accurately calibrated.

[0005] The YZ-axis calibration fixture for a length measuring instrument described in the utility model is realized by adopting the following technical scheme: it includes a structure in the shape of "n"; the "n"-shaped structure is composed of two left and right side edges and a top surface connecting the two left and right side edges; each of the two left and right side edges is horizontally provided with a through hole along the left-right direction and coaxial, serving as the reference hole of the fixture; the top surface is provided with a through hole in the vertical direction.

[0006] When calibrating and measuring the length measuring instrument, insert the reference holes of the YZ-axis calibration fixture for the length measuring instrument described in the utility model into the measuring seat probe and the tailstock probe of the length measuring instrument to be measured, insert a standard micrometer (such as an altimeter) into the through hole on the top surface, adjust it to be perpendicular to the workbench of the length measuring instrument, make the micrometer probe contact the workbench of the length measuring instrument, and fix it, then the measurement can be started.

[0007] Furthermore, locking holes corresponding to their respective through holes are respectively opened on the left and right side edges and the top surface. Among them, the locking holes on the left and right side edges are equipped with locking screws for fixing the fixture to the measuring seat probe and the tailstock probe of the length measuring instrument; the locking hole on the top surface is equipped with a locking screw for fixing the standard micrometer.

[0008] Advantages of the utility model:

[0009] The calibration fixture of the utility model has a simple, ingenious and reasonable structure and is convenient to use. Combining with the calibration method disclosed by the utility model, the YZ-axis metrological calibration of the length measuring instrument can be realized, and the function of expanding the measuring range of the length measuring instrument can be achieved, and the metrological characteristics of the length measuring instrument can be measured comprehensively and accurately. Description of the drawings

[0010] Figure 1 Structural schematic diagram of the YZ-axis calibration fixture of the length measuring instrument of the utility model.

[0011] Figure 2 Schematic diagram of the principle when the utility model is applied to the Z-axis calibration of the length measuring instrument.

[0012] Figure 3 Schematic diagram of the principle when the utility model is applied to the Y-axis calibration of the length measuring instrument.

[0013] 1 - Measuring post of the measuring seat of the length measuring instrument, 2 - Standard micrometer, 3 - YZ-axis calibration fixture of the length measuring instrument, 4 - Tailstock measuring post, 5 - Workbench of the length measuring instrument, 6 - Auxiliary gauge block;

[0014] 31 - Reference hole, 32 - Top surface through hole, 33 - Locking hole. Specific implementation mode

[0015] Example 1 As Figure 1 shown, a YZ-axis calibration fixture of a length measuring instrument includes a structure in the shape of "n"; the structure in the shape of "n" is composed of two left and right side edges and a top surface connecting the two left and right side edges; each of the two left and right side edges is horizontally provided with a through hole along the left and right directions and coaxial, serving as the reference hole 31 of the fixture; the top surface is provided with a top surface through hole 32 in the vertical direction.

[0016] Example 2 Locking holes 33 corresponding to their respective through holes are respectively opened on the left and right side edges and the top surface, wherein the locking holes 33 on the left and right side edges are equipped with locking screws for fixing the fixture to the measuring post 1 of the measuring seat of the length measuring instrument and the tailstock measuring post 4; the locking hole 33 on the top surface is equipped with a locking screw for fixing the standard micrometer 2.

[0017] The YZ-axis calibration fixture of the length measuring instrument can be used for calibrating the indication error of the Z-axis and Y-axis of the length measuring instrument.

[0018] The length measuring instrument is a precision length measuring instrument with a wide range of applications and a large number in society. On the basis of the original one-dimensional X-axis, the new digital display length measuring instrument adds a Z-axis grating scale on the load-carrying workbench, which can output the up and down displacement value of the workbench; and some also adopt corresponding technologies to output the Y-axis for the forward and backward movement of the workbench.

[0019] Existing relevant metrological technical specifications only describe the calibration method for the metrological characteristics of the X-axis. There is still no effective method for calibrating the Z-axis or Y-axis of the length measuring instrument, making it blank to determine whether the indication values of these two axes are accurate. It is difficult to quantitatively analyze the impact on the measurement accuracy involving both the X-axis and Z-axis, such as for a screw ring gauge. Fix the reference hole 31 of the length measuring instrument YZ-axis calibration fixture 3 on the X-axis measuring posts (i.e., the measuring post of the measuring base and the measuring post of the tailstock) of the length measuring instrument to be measured. Install a highly accurate standard micrometer 2 (such as a grating height gauge) through the top through hole 32, adjust it to be perpendicular to the workbench 5 of the length measuring instrument, and make the probe of the standard micrometer 2 contact the workbench 5 of the length measuring instrument, then lock it. Thus, the measurement of the Z-axis and Y-axis can be achieved through the standard micrometer 2.

[0020] Calibration method for the indication error of the Z-axis (as Figure 2 shown):

[0021] Adjust the workbench 5 of the length measuring instrument to be in a horizontal position, and adjust the length measuring instrument YZ-axis calibration fixture 3 to make the measuring direction of the standard micrometer 2 perpendicular to the workbench 5 of the length measuring instrument.

[0022] Within the effective stroke range of the Z-axis, evenly distribute several calibration points for the forward and return strokes. Zero the Z-axis and the standard micrometer, move the workbench 5 of the length measuring instrument forward or backward, and record the Z-axis displacement values at each position within this stroke and the corresponding indication values of the grating height gauge. The maximum difference between the Z-axis displacement indication value and the height gauge indication value at each calibration point is used as the indication error of the Z-axis of this length measuring instrument.

[0023] Calibration method for the indication error of the Y-axis (as Figure 3 shown):

[0024] Adjust the workbench 5 of the length measuring instrument to be in a horizontal position, fix an auxiliary gauge block 6 on it. The narrow non-working surface of the auxiliary gauge block 6 contacts the workbench 5 of the length measuring instrument, and its working surface is perpendicular to the workbench 5 of the length measuring instrument and the center line is parallel to the movement direction of the Y-axis. Adjust the length measuring instrument YZ-axis calibration fixture 3 to make the measuring direction of the standard micrometer 2 parallel to the workbench and perpendicular to the working surface of the auxiliary gauge block 6, and make the probe of the standard micrometer 2 contact the auxiliary gauge block 6.

[0025] Within the effective stroke range of the Y-axis, evenly distribute several calibration points for the forward and return strokes. Zero the Y-axis and the standard micrometer 2, move the workbench 5 of the length measuring instrument forward or backward, and record the Y-axis displacement values at each position within this stroke and the corresponding indication values of the standard micrometer 2. The maximum difference between the Y-axis displacement indication value and the indication value of the standard micrometer 2 at each calibration point is used as the indication error of the Y-axis of this length measuring instrument.

[0026] For the Z-axis indication error calibration method, on the basis described above, in the Z-axis indication error calibration method, an auxiliary gauge block 6 can also be fixed on the workbench 5 of the length comparator; one working surface of the auxiliary gauge block 6 is installed on the workbench 5 of the length comparator, and the other working surface is parallel to the workbench 5 of the length comparator and perpendicular to the measuring direction of the standard micrometer 2, and the probe of the standard micrometer 2 contacts the auxiliary gauge block 6; then the calibration begins.

Claims

1. A YZ axis calibration fixture for a length measuring instrument, characterized in that: The device comprises an "n"-shaped structure; the "n"-shaped structure is composed of two left and right sides and a top surface connecting the left and right sides; the left and right sides each have a horizontal through hole extending in the left-right direction and coaxially, serving as a reference hole (31) of the inspection fixture; and the top surface has a vertical through hole (32).

2. A YZ axis calibration fixture for a length measuring instrument as claimed in claim 1, characterized in that: The left and right sides and the top surface are respectively provided with locking holes (33) corresponding to the respective through holes, wherein the locking holes (33) on the left and right sides are provided with locking screws for fixing the gauge to the measuring seat measuring column (1) and the tailstock measuring column (4) of the length measuring instrument; and the locking holes (33) on the top surface are provided with locking screws for fixing the standard micrometer (2).

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