CN111981958A - A special inspection tool and inspection method for depth micrometer inspection - Google Patents

Abstract

A special inspection tool for depth micrometer verification and a verification method, wherein the special inspection tool for depth micrometer verification includes a rectangular measuring block and a standard steel ball; The bottom surface of the circular groove is a spherical arc surface; the standard steel balls are arranged in several groups, and their diameters are corresponding to circular grooves of different sizes; the outer surface of the rectangular measuring block, the circular groove The roughness of the bottom surface and the surface of the standard steel ball is Ra<0.1mm. Through the design of the combined structure of the standard measuring block and the standard steel ball, the invention innovates a method for detecting the parallelism between the measuring surface of the bottom plate of the depth micrometer and the measuring surface of the measuring rod, so as to ensure the accuracy of the detection result and improve the working efficiency. Purpose.

Description

A special inspection tool and inspection method for depth micrometer inspection

technical field

The invention relates to a checking tool and a checking method, in particular to a special checking tool and checking method for detecting the parallelism between the measuring surface of the measuring rod and the measuring surface of the bottom plate in the depth micrometer checking process.

Background technique

As shown in Figure 1, the depth micrometer 1 is an instrument for measuring the distance between the bottom plate measuring surface and the measuring rod measuring surface by using the principle of the screw pair. -3. The bottom plate 1-4 and the locking device 1-5 and other components are mainly used for the measurement of the depth and steps of the precision workpiece during the machining process. For the depth micrometer whose measuring surface of measuring rod 1-3 is a flat surface, since the parallelism between the measuring surface of base plate 1-4 and the measuring surface of measuring rod 1-3 has a great influence on the accuracy of the measurement result, therefore, in countries that target depth micrometers In the standard verification procedures, the parallelism detection of the measuring surface of the measuring rod and the measuring surface of the bottom plate is listed as a mandatory inspection item, and it is regarded as a verification rejection item, that is, if this item is found to be unqualified, the whole micrometer will be scrapped.

In the national standard verification regulations, the parallelism detection of the measuring surface of the measuring rod and the measuring surface of the base plate adopts the standard steel ball detection method. Contact with the standard steel ball 3 to obtain a set of measurement data, compare the measurement data with the diameter of the standard steel ball 3, and obtain the parallelism deviation between the measuring surface of the depth micrometer measuring rod 1-1 and the measuring surface of the base plate 1-2, Since the steel ball 3 is directly placed on the platform 4 during the inspection process, it is easy to roll back and forth, not only the position of the steel ball 3 is difficult to control, the work efficiency is low, but also the platform 4 is easily scratched. 4. The roughness of the surface is very high. After the platform 4 is scratched, it will cause the measurement standard to be inaccurate, resulting in the problem of poor accuracy of the test results.

SUMMARY OF THE INVENTION

The invention provides a special inspection tool and a detection method for depth micrometer verification, aiming to innovate a detection method for the parallelism between the measurement surface of the bottom plate of the depth micrometer and the measurement surface of the measurement rod through the design of the combined structure of the standard measurement block and the standard steel ball , to ensure the accuracy of test results and improve work efficiency.

To achieve the above object, the present invention adopts the following technical solutions:

A special inspection tool for depth micrometer verification includes a rectangular measuring block and a standard steel ball; the rectangular measuring block is provided with several groups of circular grooves of different sizes and specifications on its outer surface, and the bottom surface of the circular groove is spherical Curved surface; the standard steel balls are configured in several groups, the diameters of which correspond to circular grooves of different sizes; the roughness Ra of the outer surface of the rectangular measuring block, the bottom surface of the circular groove and the surface of the standard steel ball <0.1mm.

The above-mentioned special inspection tool for depth micrometer inspection is provided with a non-slip structure on the side elevation of the rectangular measuring block.

In the above-mentioned special inspection tool for depth micrometer verification, the anti-skid structure is an anti-skid long groove running through the upper end surface and the bottom surface, and the number of the anti-skid long groove is not less than two groups.

In the above-mentioned special inspection tool for depth micrometer verification, the anti-skid structure is a group of circular grooves arranged in a straight line along the vertical axis direction.

A depth micrometer verification method, using the above-mentioned special inspection tool to complete the detection of the parallelism between the measuring surface of the measuring rod of the depth micrometer and the measuring surface of the bottom plate, comprising the following steps:

a. To locate the depth micrometer, first select two gauge blocks whose size and specifications match the range of the depth micrometer to be verified, place the two gauge blocks on the flat plate in parallel, and then mount the bottom plate of the depth micrometer to be verified on the two gauge blocks , so that the measuring surface of the bottom plate of the depth micrometer is fitted with the upper end surfaces of the two gauge blocks;

b. Select the circular groove and standard steel ball on the rectangular measuring block, and select the circular groove and standard steel ball of a certain size on the rectangular measuring block according to the range of the depth micrometer to be verified;

c. Make the side of the rectangular measuring block with the circular groove of the selected size up, and place the selected standard steel ball in the circular groove of the selected size, then place the rectangular measuring block and the standard steel ball together. placed between the two gauge blocks on the plate;

d. Move the rectangular measuring block so that the standard steel ball is in contact with the four points of the front, rear, left and right positions of the measuring surface of the measuring rod of the depth micrometer to be verified, and read the readings of the four measuring points respectively;

e. Calculate the difference between the maximum value and the minimum value in the readings of the four measuring points;

f. Repeat step d and step e, calculate the average value of the difference between the maximum value and the minimum value, and correct the average value to obtain the parallelism value between the measuring surface of the measuring rod of the verified depth micrometer and the measuring surface of the base plate;

g. Compare the parallelism value of the measuring surface of the measuring rod and the measuring surface of the bottom plate to the standard setting value to determine whether the detected depth micrometer is qualified, and complete the verification process of the depth micrometer.

In the above depth micrometer verification method, the ambient temperature when the parallelism between the measuring surface of the measuring rod of the depth micrometer and the measuring surface of the bottom plate is detected is 20±5°C.

In the above-mentioned depth micrometer verification method, in the step a, the two gauge blocks are located 3-5mm away from the edge of the bottom plate measuring surface of the depth micrometer to be verified.

In the above-mentioned depth micrometer verification method, in the step f, the number of repeated measurements is ten times.

The invention provides a special inspection tool for depth micrometer verification and a detection method. In the special inspection tool for depth micrometer verification, the diameter of the circular groove set on the outer surface of the rectangular measuring block is slightly larger than the diameter of the corresponding standard steel ball of diameter size. The diameter of the standard steel ball enables the standard steel ball to rotate in the circular groove and realizes the self-centering effect of the standard steel ball, which ensures the consistency of the contact point height between the standard steel ball and the measuring surface of the depth micrometer measuring rod during the measurement process, thereby ensuring In order to ensure the accuracy of the measurement results; the roughness of the outer surface of the rectangular measuring block, the bottom surface of the groove and the surface of the standard steel ball of the special inspection tool for depth micrometer verification of the present invention is Ra<0.1mm, so when the depth micrometer measuring rod measuring surface is compared with When testing the parallelism of the measuring surface of the bottom plate, the special inspection tool can be placed between the flat plate and the measuring surface of the measuring rod, which can not only limit the position of the standard steel ball, but also allow the operator to complete the inspection items independently, avoiding the steel ball Sliding on the flat plate causes measurement errors; in addition, a non-slip structure is set on the side elevation of the rectangular measuring block in the special inspection tool for depth micrometer verification according to the present invention, which avoids the rectangular measuring block falling due to operator slippage when placed. The problem of damage to the flat plate ensures the flatness of the measurement datum, especially a group of circular grooves arranged in a straight line are used as the anti-skid structure, which not only has the anti-skid function, but also can be used for the positioning of standard steel balls of certain diameters. Thereby enhancing its general performance. To sum up, the present invention innovates a method for detecting the parallelism between the measuring surface of the bottom plate of the depth micrometer and the measuring surface of the measuring rod through the design of the combined structure of the standard measuring block and the standard steel ball, so as to ensure the accuracy of the detection result. , the purpose of improving work efficiency.

Description of drawings

Fig. 1 is the schematic diagram of the standard verification procedure of depth micrometer;

2 is a schematic structural diagram of a special inspection tool for depth micrometer verification according to the present invention;

Fig. 3 is the exploded structure schematic diagram of Fig. 2;

Figure 4 is a schematic diagram of the cross-sectional structure of a special inspection tool for depth micrometer verification;

Fig. 5 is the K-direction view of Fig. 2;

6 is a schematic diagram of the working state of the special inspection tool for depth micrometer inspection according to the present invention.

The list of labels in the figure is:

1. Depth Micrometer, 1-1, Differential Cylinder, 1-2, Fixed Sleeve, 1-3, Measuring Rod, 1-4, Bottom Plate, 1-5, Locking Device;

2. Gauge block;

3. Standard steel ball;

4. Flat panel;

5. Rectangular measuring block, 5-1, circular groove, 5-2, anti-skid long groove.

Detailed ways

The invention provides a special inspection tool and a detection method for depth micrometer verification, especially a special inspection tool and inspection method for detecting the parallelism between the measuring surface of the measuring rod and the measuring surface of the bottom plate during the verification process of the depth micrometer. The present invention will be further described with specific examples.

Referring to Figure 2, Figure 3, Figure 4, Figure 5, the special inspection tool for depth micrometer verification of the present invention includes a rectangular measuring block 5 and a standard steel ball 3; the rectangular measuring block 5 is provided with several groups on its outer surface. Circular grooves 5-1 of different sizes and specifications, the bottom surface of the circular grooves 5-1 is a spherical arc surface; the standard steel balls 3 are configured in several groups, and their diameters are respectively the same as the circular grooves of different sizes and specifications. The groove 5-1 corresponds; the roughness Ra of the outer surface of the rectangular measuring block 5, the bottom surface of the circular groove 5-1 and the surface of the standard steel ball 3 is <0.1 mm.

2 and 3, the special inspection tool for depth micrometer verification according to the present invention is provided with an anti-skid structure on the side elevation of the rectangular measuring block 5; the first preferred embodiment of the anti-skid structure is to penetrate through the upper end surface. With the anti-skid long grooves 5-2 on the bottom surface, the number of the anti-skid long grooves 5-2 is not less than two groups.

Referring to Figures 2 and 5, the second preferred embodiment of the anti-skid structure of the special inspection tool for depth micrometer verification according to the present invention is a group of circular grooves arranged in a straight line along the vertical axis direction.

Referring to Figure 1, in the national standard verification regulations for depth micrometers, the parallelism detection between the measuring surface of the measuring rod and the measuring surface of the bottom plate adopts a standard steel ball detection method, that is, by changing the position of the steel ball 3, the measuring rod in the depth micrometer 1 is detected. 1-1 Different positions of the measuring surface are in contact with the standard steel ball 3, thereby obtaining a set of measurement data, and comparing the measured data with the diameter of the standard steel ball 3 to obtain the depth micrometer measuring rod 1-1 Measuring surface and bottom plate 1-2 The deviation of the parallelism of the measurement surface, because the steel ball 3 is directly placed on the platform 4 during the detection process, it is easy to roll back and forth, not only the position of the steel ball 3 is difficult to control, the work efficiency is low, but also it is easy to scratch the platform 4 However, in the standard inspection procedure, the roughness of the surface of the platform 4 is very high. After the platform 4 is scratched, the measurement standard is inaccurate, resulting in the problem of poor accuracy of the detection result.

Referring to Figure 6, the depth micrometer verification method of the present invention adopts the above-mentioned special inspection tool for depth micrometer verification to complete the detection of the parallelism between the measuring rod 1-3 measuring surface of the depth micrometer 1 and the measuring surface of the bottom plate 1-4, and the depth micrometer is measured. The ambient temperature during the parallelism detection between the measuring surface of the measuring rod and the measuring surface of the base plate is controlled at 20±5℃. The specific operation steps are as follows:

a. To locate the depth micrometer, first select two gauge blocks 2 whose dimensions match the range of the depth micrometer to be verified, place the two gauge blocks 2 on the flat plate 4 in parallel, and then place the bottom plate 1- 4. Mounted on two gauge blocks 2, so that the measuring surface of the bottom plate 1-4 of the depth micrometer 1 is attached to the upper end surface of the two gauge blocks 2, and the two gauge blocks 2 are located at a distance from the bottom plate 1-4 of the depth micrometer 1 to be verified. 3-5mm position on the edge of the measuring surface;

b. Select the circular groove 5-1 and the standard steel ball 3 on the rectangular measuring block 5, and select the circular groove 5-1 of a certain size and standard on the rectangular measuring block 5 according to the range of the verified depth micrometer 1. steel ball 3;

c. Make the side of the rectangular measuring block 5 with the circular groove of the selected size up, and place the selected standard steel ball 3 in the circular groove 5-1 of the selected size, and measure the rectangular The block 5 and the standard steel ball 3 are placed between the two gauge blocks 2 on the flat plate 4;

d. Move the rectangular measuring block 5, so that the standard steel ball 3 is in contact with the four points of the front, rear, left and right positions of the measuring surface of the measured depth micrometer 1 measuring rod 1-3 respectively, and read the four measuring points respectively. reading;

e. Calculate the difference between the maximum value and the minimum value in the readings of the four measuring points;

f. Repeat step d and step e ten times, calculate the average value of the difference between the maximum value and the minimum value, and correct the average value to obtain the parallelism value between the measuring surface of the measuring rod of the verified depth micrometer and the measuring surface of the bottom plate;

g. Compare the parallelism value of the measuring surface of the measuring rod and the measuring surface of the base plate with the standard setting value to determine whether the detected depth micrometer 1 is qualified, and complete the verification process of the depth micrometer.

Claims (8)

1. A special detection tool for detecting a depth micrometer is characterized by comprising a rectangular measuring block (5) and a standard steel ball (3); the rectangular measuring block (5) is provided with a plurality of groups of circular grooves (5-1) with different dimensions on the outer surface, and the bottom surfaces of the circular grooves (5-1) are spherical cambered surfaces; the standard steel balls (3) are configured into a plurality of groups, and the diameter sizes of the standard steel balls correspond to the circular grooves (5-1) with different sizes and specifications respectively; the roughness Ra of the outer surface of the rectangular measuring block (5), the bottom surface of the circular groove (5-1) and the surface of the standard steel ball (3) is less than 0.1 mm.

2. The special detection tool for detecting the depth micrometer as claimed in claim 1, wherein an anti-skid structure is arranged on the side vertical surface of the rectangular measuring block (5).

3. The special detection tool for detecting the depth micrometer as claimed in claim 2, wherein the anti-skid structures are anti-skid long grooves (5-2) penetrating through the upper end surface and the bottom surface, and the number of the anti-skid long grooves (5-2) is not less than two.

4. The special detection tool for detecting the depth micrometer as claimed in claim 2, wherein the anti-slip structure is a group of circular grooves which are linearly arranged along a vertical axis.

5. A method for calibrating a depth micrometer, which adopts the special detection tool for calibrating the depth micrometer as claimed in any one of claims 1 to 4 to complete the detection of the parallelism of the measuring surface of the measuring rod (1-3) and the measuring surface of the bottom plate (1-4) of the depth micrometer (1), and comprises the following steps:

a. positioning the depth micrometer, namely firstly selecting two measuring blocks (2) with the size specification matched with the measuring range of the depth micrometer to be detected, placing the two measuring blocks (2) on a flat plate (4) in parallel, and then loading a bottom plate (1-4) of the detected depth micrometer (1) on the two measuring blocks (2) to ensure that the measuring surface of the bottom plate (1-4) of the depth micrometer (1) is attached to the upper end surfaces of the two measuring blocks (2);

b. selecting a circular groove (5-1) and a standard steel ball (3) on a rectangular measuring block (5), and selecting the circular groove (5-1) and the standard steel ball (3) with a certain size specification on the rectangular measuring block (5) according to the measuring range of the detected depth micrometer (1);

c. one surface of the rectangular measuring block (5) provided with the circular groove with the selected size specification faces upwards, and after the selected standard steel ball (3) is placed in the circular groove (5-1) with the selected size specification, the rectangular measuring block (5) and the standard steel ball (3) are placed between the two measuring blocks (2) on the flat plate (4);

d. moving a rectangular measuring block (5) to enable a standard steel ball (3) to be in contact with four points at the front, rear, left and right positions of the measuring surface of a measuring rod (1-3) of the micrometer (1) to be detected respectively, and reading the readings of the four measuring points respectively;

e. calculating the difference value between the maximum value and the minimum value in the readings of the four measuring points;

f. repeating the step d and the step e, calculating an average value of the difference value between the maximum value and the minimum value, and correcting the average value to obtain a parallelism value of the measuring surface of the measuring rod and the measuring surface of the bottom plate of the micrometer with the detected depth;

g. and comparing the parallelism value of the measuring surface of the measuring rod and the measuring surface of the bottom plate of the depth micrometer to be detected with a standard set value, judging whether the detected depth micrometer (1) is qualified or not, and finishing the verification process of the depth micrometer.

6. The method for calibrating the depth micrometer according to claim 5, wherein the environment temperature for detecting the parallelism of the measuring surface of the measuring rod and the measuring surface of the bottom plate of the depth micrometer is 20 ± 5 ℃.

7. The method for calibrating the depth micrometer according to claim 6, wherein in the step a, the two gauge blocks (2) are positioned at a distance of 3-5mm from the edge of the measuring surface of the bottom plate (1-4) of the depth micrometer (1) to be calibrated.

8. The method of calibrating a depth micrometer according to claim 6, wherein in the step f, the number of repeated measurements is ten.

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