Method and tool for measuring qualified aperture depth

Abstract

The invention discloses a method for measuring qualified aperture depth and a tool thereof, and the method for measuring qualified aperture depth comprises the following steps: S1, selecting a corresponding go end measuring head according to the tolerance zone of the diameter phi D of a measured hole; s2, mounting a go-end measuring head at the bottom end of the measuring scale, and extending the measuring scale into the hole until the measuring scale cannot continuously extend into the hole; s3, reading a scale value H1, aligned with the zero scale line of the measuring seat, on the measuring ruler; s4, changing the go-end measuring head into a stop-end measuring head, repeating the steps S1 and S3, and reading the scale value H2 on the measuring scale at the moment; and S5, comparing H1 with the depth H of the measured hole, and if H1 is equal to H and H2 is equal to 0, determining that the depth H of the measured hole is qualified and the diameter tolerance of the measured hole is qualified. By using the method, measuring heads with different precisions can be selected to measure the hole diameters and hole depths of parts with different precisions, and a tool corresponding to the method is simple in structure, easy to operate and good in applicability.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical manufacturing detection, and in particular relates to a method and a tool for measuring the depth of a qualified aperture. Background Art

[0002] In the field of mechanical processing, some high-precision holes need to have their diameter and depth accurately measured. Ordinary plug gauges can only measure whether the hole diameter meets the precision requirements, but some deeper holes cannot determine whether the hole precision requirements meet the corresponding depth. At present, there are also devices that can achieve high-precision measurement of hole diameter and hole depth, but the cost is high, the structure is complex, and the operation is difficult. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a method and tool for measuring qualified aperture depth, the purpose of which is to measure whether the aperture depth is qualified while reducing costs and operating difficulty.

[0004] In order to achieve the above object, the present invention adopts the following technical solution: a method for measuring the depth of a qualified aperture, comprising the following steps: S1. Select the corresponding through-end measuring head according to the tolerance band of the measured hole diameter ΦD; S2. Install the through-end measuring head at the bottom of the measuring ruler, and insert the measuring ruler into the hole until it cannot be inserted further; S3, read the scale value H1 on the measuring ruler aligned with the zero scale line of the measuring seat; S4, change the through-end measuring head to the stop-end measuring head, repeat steps S1 and S3, and read the scale value H2 on the measuring ruler at this time; S5. Compare H1 with the measured hole depth H. If H1=H and H2=0, the measured hole depth H is qualified and the measured hole diameter tolerance is qualified.

[0005] The upper deviation of the measured hole diameter is ΦD ES , the lower deviation of the measured hole diameter is ΦD EI , the wear limit reserve is D M， The outer diameter of the through-end measuring head is ΦT, ΦT=ΦD EI +D M , the outer diameter of the stop head is ΦZ, ΦZ=ΦD ES -D M .

[0006] The wear limit reserve D M The range is 0.001mm~0.003mm.

[0007] The tool used in the above method for measuring the depth of the aperture includes a measuring ruler, a measuring seat and a measuring head. The measuring head includes a through-end measuring head and a stop-end measuring head. The measuring head is cylindrical and connected to the measuring ruler. The measuring seat is slidably sleeved on the measuring ruler. A groove is provided at the bottom of the measuring seat. The height of the measuring head is consistent with the depth of the groove. The distance from the upper end surface of the measuring head to the zero scale line of the measuring ruler is consistent with the distance from the bottom end surface of the groove to the zero scale line of the measuring seat. The outer diameter of the through-end measuring head is ΦT, ΦT=ΦD EI +D M , the outer diameter of the stop head is ΦZ, ΦZ=ΦD ES -D M ,ΦD ES is the upper deviation of the measured hole diameter, ΦD EI is the wear limit reserve, wear limit reserve D M The range is 0.001mm~0.003mm.

[0008] The beneficial effects of the present invention are as follows: the present invention can measure the hole diameters and hole depths of parts with different precisions by selecting measuring heads with different precisions, and can accurately feedback the processing quality status of parts by judging the range of unqualified hole diameters and hole depths, thereby reducing production costs; compared with the prior art, the present invention has a simple structure, simple operation, can be used on the production site, and has strong applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The present invention will be further described below in conjunction with the accompanying drawings: Figure 1 This is a schematic diagram of the measurement using a through-end measuring head in the present invention; Figure 2 This is a schematic diagram of the measurement using a stop-end measuring head in the present invention; In the figure: 1. measuring ruler; 2. measuring seat; 3. through-end measuring head; 4. stop-end measuring head. DETAILED DESCRIPTION

[0010] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0011] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined or replaced with each other according to actual conditions, and the same or similar concepts or processes may not be described in detail in some embodiments. Example

[0012] like Figure 1 to Figure 2 As shown, the present invention provides a method for measuring the qualified aperture depth, comprising the following steps: S1, select the corresponding through-end measuring head 3 according to the tolerance band of the measured hole diameter ΦD; S2. Install the through-end measuring head 3 at the bottom of the measuring ruler 1, and insert the measuring ruler 1 into the hole until it cannot be inserted further; S3, read the scale value H1 on the measuring ruler 1 aligned with the zero scale line of the measuring base 2; S4, repeat steps S1 and S3, wherein the through-end measuring head 3 is replaced with the stop-end measuring head 4, and the scale value H2 on the measuring ruler is read at this time; S5. Compare H1 with the measured hole depth H. If H1=H and H2=0, the measured hole depth H is qualified and the measured hole diameter tolerance is qualified.

[0013] Specifically, the upper deviation of the measured hole diameter is ΦD ES , the lower deviation of the measured hole diameter is ΦD EI , the wear limit reserve is D M， The outer diameter of the through-end measuring head 3 is ΦT, ΦT=ΦD EI +D M , the outer diameter of the stop head 4 is ΦZ, ΦZ=ΦD ES -D M The wear limit reserve D M The range is 0.001mm~0.003mm.

[0014] The tool used in the above method for measuring the aperture depth includes a measuring ruler 1, a measuring seat 2 and a measuring head, characterized in that the measuring head includes a through-end measuring head 3 and a stop-end measuring head 4, the measuring head is cylindrical and connected to the measuring ruler 1, the measuring seat 2 is slidably sleeved on the measuring ruler 1, a groove is provided at the bottom of the measuring seat 2, the height of the measuring head is consistent with the depth of the groove, and the distance from the upper end face of the measuring head to the zero scale line of the measuring ruler 1 is consistent with the distance from the bottom end face of the groove to the zero scale line of the measuring seat 2. The outer diameter of the through-end measuring head 3 is ΦT, ΦT=ΦD EI +D M , the outer diameter of the stop head 4 is ΦZ, ΦZ=ΦD ES -D M ,ΦD ES is the upper deviation of the measured hole diameter, ΦD EI is the wear limit reserve, wear limit reserve D M The range is 0.001mm~0.003mm.

[0015] Working principle: By keeping the height of the measuring head consistent with the depth of the groove, the distance from the upper end face of the measuring head to the zero scale line of the measuring ruler 1 is consistent with the distance from the bottom end face of the groove to the zero scale line of the measuring seat 2, and the height of the measuring head and the distance from the upper end face of the measuring head to the zero scale line of the measuring ruler 1 are converted by using the groove depth and the distance from the bottom end face of the groove to the zero scale line of the measuring seat 2, so that the diameter and depth of the hole can be detected by the scale value of the zero scale line of the measuring ruler and the measuring seat 2 being aligned.

[0016] Specifically, when using the through-end measuring head 3 for detection, since the outer diameter of the through-end measuring head 3 is the total value of the lower deviation of the hole diameter and the wear limit reserve, the through-end measuring head 3 is inserted into the measured hole. If the scale value at which the measuring ruler is aligned with the zero scale line of the measuring seat 2 is not equal to the specified depth of the measured hole, it means that the measured hole is stuck at a certain position, the hole diameter is too small, and the diameter of the measured hole is unqualified; when switching to the stop-end measuring head 4 for detection, the stop-end measuring head 4 cannot enter the measured hole, and the scale value at which the measuring ruler is aligned with the zero scale line of the measuring seat 2 is zero. At this time, it is necessary to combine the measurement situation of the through-end measuring head 3. Only when H1=H and H2=0, the measured hole depth H is qualified and the measured hole diameter tolerance is qualified.

[0017] In addition to the above-mentioned preferred embodiments, the present invention also has other implementation modes. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection requested by the present invention.

Claims

1. A method for measuring the depth of a qualified aperture, characterized in that: The following steps are involved: S1. Select the corresponding through-end measuring head (3) according to the tolerance band of the measured hole diameter ΦD; S2. Install the through-end measuring head (3) at the bottom of the measuring ruler (1), and insert the measuring ruler (1) into the hole until it cannot be inserted further; S3, read the measuring ruler (1) and the measuring base (2) aligned with the zero scale line of the scale value H1; S4, replace the through-end measuring head (3) with the stop-end measuring head (4), repeat steps S1 and S3, and read the scale value H2 on the measuring ruler at this time; S5. Compare H1 with the measured hole depth H. If H1=H and H2=0, the measured hole depth H is qualified and the measured hole diameter tolerance is qualified.

2. A method for measuring the depth of a qualified aperture according to claim 1, characterized in that: The upper deviation of the measured hole diameter is ΦD ES , the lower deviation of the measured hole diameter is ΦD EI , the wear limit reserve is D M， The outer diameter of the through-end measuring head (3) is ΦT, ΦT=ΦD EI +D M , the outer diameter of the stop head (4) is ΦZ, ΦZ=ΦD ES -D M .

3. A method for measuring the depth of a qualified aperture according to claim 2, characterized in that: The wear limit reserve D M The range is 0.001mm~0.003mm.

4. A tool for measuring hole depth, comprising a measuring ruler (1), a measuring seat (2) and a measuring head, characterized in that: The measuring head comprises a through-end measuring head (3) and a stop-end measuring head (4), the measuring head is cylindrical and connected to the measuring ruler (1), the measuring seat (2) is slidably sleeved on the measuring ruler (1), the bottom of the measuring seat (2) is provided with a groove, the height of the measuring head is consistent with the depth of the groove, and the distance from the upper end surface of the measuring head to the zero scale line of the measuring ruler (1) is consistent with the distance from the bottom end surface of the groove to the zero scale line of the measuring seat (2).

5. A tool for measuring hole depth according to claim 4, characterized in that: The outer diameter of the through-end measuring head (3) is ΦT, ΦT=ΦD EI +D M , the outer diameter of the stop head (4) is ΦZ, ΦZ=ΦD ES -D M ,ΦD ES is the upper deviation of the measured hole diameter, ΦD EI is the wear limit reserve, wear limit reserve D M The range is 0.001mm~0.003mm.

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