阅读说明：本技术 一种用于差速器蝶形垫片的检具设计方法及检测方法 (Design method and detection method of detection tool for butterfly-shaped gasket of differential ) 是由 聂少文 薛龙 余秋石 雷君 唐琛 于 2020-06-09 设计创作，主要内容包括：本发明涉及汽车零部件检具设计方法技术领域,具体地指一种用于差速器蝶形垫片的检具设计方法及检测方法。设计用于检测差速器蝶形垫片的检具,包括用于支撑待检蝶形垫片的具有球形凹槽的测量体和放置于待检蝶形垫片上的测量球；通过蝶形垫片设计参数中的蝶形垫片内径尺寸公称值S和蝶形垫片内径尺寸公称值S的公差下限计算设计检具中测量球的球径M；通过蝶形垫片内径尺寸公称值S和蝶形垫片厚度尺寸公称值δ以及上述公称值对应的公差上限计算设计检具中测量体凹槽的球径N,并按照该设计参数制造用于检测蝶形垫片的检具。本发明通过依据差速器蝶形垫片的设计参数来设计检具,得到的检具能够更好的反映蝶形垫片的实际情况。(The invention relates to the technical field of automobile part checking fixture design methods, in particular to a checking fixture design method and a checking method for a butterfly-shaped gasket of a differential mechanism. The checking fixture for detecting the differential butterfly gasket comprises a measuring body with a spherical groove and a measuring ball, wherein the measuring body is used for supporting the butterfly gasket to be detected, and the measuring ball is placed on the butterfly gasket to be detected; calculating the sphere diameter M of a measuring sphere in the design check tool according to the nominal value S of the inner diameter size of the butterfly gasket and the lower tolerance limit of the nominal value S of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket; and calculating and designing the sphere diameter N of the groove of the measuring body in the checking fixture according to the nominal value S of the inner diameter dimension of the butterfly gasket, the nominal value of the thickness dimension of the butterfly gasket and the tolerance upper limit corresponding to the nominal values, and manufacturing the checking fixture for detecting the butterfly gasket according to the design parameters. According to the invention, the checking fixture is designed according to the design parameters of the butterfly gasket of the differential, and the obtained checking fixture can better reflect the actual condition of the butterfly gasket.)

1. A design method of a detection tool for a butterfly gasket of a differential is characterized by comprising the following steps: the checking fixture for detecting the differential butterfly gasket comprises a measuring body with a spherical groove and a measuring ball, wherein the measuring body is used for supporting the butterfly gasket to be detected, and the measuring ball is placed on the butterfly gasket to be detected;

calculating the sphere diameter M of a measuring sphere in the design check tool according to the nominal value S of the inner diameter size of the butterfly gasket and the lower tolerance limit of the nominal value S of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket; and calculating and designing the sphere diameter N of the groove of the measuring body in the checking fixture according to the nominal value S of the inner diameter dimension of the butterfly gasket, the nominal value of the thickness dimension of the butterfly gasket and the tolerance upper limit corresponding to the nominal values, and manufacturing the checking fixture for detecting the butterfly gasket according to the design parameters.

2. The method for designing a check tool for a differential butterfly washer according to claim 1, wherein: calculating the ball diameter M of a measuring ball in the design check tool according to the nominal value S of the inner diameter size of the butterfly gasket and the lower tolerance limit of the nominal value S of the inner diameter size of the butterfly gasket, so that the inner side edge of a central hole of the butterfly gasket can be completely attached to the outer side of a lower ball body of the designed measuring ball;

and calculating the spherical diameter N of the groove of the measuring body in the design checking fixture according to the nominal value S of the inner diameter dimension of the butterfly gasket, the nominal value of the thickness dimension of the butterfly gasket and the tolerance upper limit corresponding to the nominal values, so that the outer edge of the central hole of the butterfly gasket can be completely attached to the bottom surface of the groove of the designed measuring body.

3. The design method of the check tool for the butterfly gasket of the differential as claimed in claim 1 or 2, wherein: the method for determining the sphere diameter M of the measuring sphere comprises the following steps:

M＝S+a

wherein: m-measuring the sphere diameter of the measuring sphere in the gauge;

s, a nominal value of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket;

a, the lower tolerance limit of the nominal value of the inner diameter dimension of the butterfly gasket in the design parameters of the butterfly gasket.

4. The design method of the check tool for the butterfly gasket of the differential as claimed in claim 1 or 2, wherein: the method for determining the sphere diameter N of the groove of the measuring body comprises the following steps:

N＝S+b+2+2f

wherein: n-measuring the sphere diameter of the spherical groove of the measuring body in the gauge;

s, a nominal value of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket;

b, tolerance upper limit of nominal value of inner diameter size of the butterfly gasket in design parameters of the butterfly gasket;

-nominal values of butterfly gasket thickness dimensions in butterfly gasket design parameters;

f is the tolerance upper limit of the nominal value of the thickness dimension of the butterfly gasket in the design parameters of the butterfly gasket.

5. A detection method of a butterfly gasket of a differential mechanism is characterized by comprising the following steps: designing and manufacturing a detection tool for detecting the butterfly gasket according to the design parameters of the butterfly gasket, wherein the detection tool comprises a measurement body with a spherical groove and a measurement ball, the measurement body is used for supporting the butterfly gasket to be detected, the measurement ball is placed on the butterfly gasket to be detected, and the ball diameter M of the measurement ball and the ball diameter N of the groove of the measurement body of the detection tool are obtained according to the nominal value S of the inner diameter size of the butterfly gasket, the nominal value of the thickness size of the butterfly gasket, and the lower tolerance limit and the upper tolerance limit corresponding to the nominal value in the design parameters of the;

during detection, the convex surface of the butterfly gasket to be detected is placed in the groove of the measuring body, the outer side edge of the center hole of the butterfly gasket to be detected is attached to the bottom surface of the groove, the measuring ball is placed in the concave surface of the butterfly gasket to be detected, the inner side edge of the center hole of the butterfly gasket to be detected is attached to the outer side of the lower portion of the measuring ball, the distance H from the bottom surface of the groove of the measuring body to the top surface of the measuring ball is measured and calculated, and whether the butterfly.

6. The method of claim 5, wherein the step of detecting comprises: the method for measuring and calculating the distance H from the bottom surface of the groove of the measuring body to the top surface of the measuring ball comprises the following steps: rotating the butterfly-shaped gasket to be detected and the measuring ball to fully contact with each other, measuring the height from the bottom surface of the measuring body to the top surface of the measuring ball, and subtracting the height from the bottom surface of the measuring body to the bottom surface of the groove to obtain a height value; rotating the butterfly gasket to be detected and the measuring ball again, and measuring and calculating to obtain another height value; repeating the steps, and selecting the minimum height value as H.

7. The method of detecting a differential butterfly gasket of claim 5 or 6, further comprising: the method for judging whether the butterfly gasket to be detected is qualified through the H comprises the following steps: determining the maximum value H meeting the butterfly gasket design standard according to the nominal value S of the inner diameter dimension of the butterfly gasket, the nominal value of the thickness dimension of the butterfly gasket, the nominal value A of the central hole dimension of the butterfly gasket, and the lower tolerance limit and the upper tolerance limit corresponding to the nominal values in the design parameters of the butterfly gasket_maxAnd a minimum value H_minWhen H is at maximumValue H_maxAnd a minimum value H_minAnd if so, proving that the butterfly gasket to be detected is qualified, otherwise, proving that the butterfly gasket to be detected is unqualified.

8. The method of claim 7, wherein the step of detecting comprises: the maximum value H_maxAnd a minimum value H_minThe calculation method comprises the following steps:

wherein: h_max-the maximum height from the bottom surface of the measuring body recess to the top surface of the measuring sphere that meets the butterfly gasket design criteria;

H_min-a minimum height from the bottom surface of the measuring body recess to the top surface of the measuring sphere that meets the butterfly gasket design criteria;

s is the nominal value of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket;

a-the nominal size tolerance lower limit of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket;

b-the upper limit of the nominal size tolerance of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket;

a is the nominal value of the aperture size of the butterfly gasket central hole in the butterfly gasket design parameters;

c, nominal size tolerance lower limit of the aperture of the central hole of the butterfly gasket in the design parameters of the butterfly gasket;

d is the upper limit of the nominal size tolerance of the aperture of the central hole of the butterfly gasket in the design parameters of the butterfly gasket;

-nominal value of butterfly gasket thickness dimension in butterfly gasket design parameters;

e is the nominal size tolerance lower limit of the thickness size of the butterfly gasket in the design parameters of the butterfly gasket;

f-nominal dimensional tolerance upper limit for butterfly gasket thickness dimension in butterfly gasket design parameters.

Technical Field

The invention relates to the technical field of automobile part checking fixture design methods, in particular to a checking fixture design method and a checking method for a butterfly-shaped gasket of a differential mechanism.

Background

The spherical butterfly-shaped gasket is widely applied to automobile differentials, the surface of the spherical butterfly-shaped gasket has high wear resistance after heat treatment, and the spherical diameter of the spherical butterfly-shaped gasket is very important for assembly and use. At present, the spherical diameter detection means of the spherical butterfly gaskets mainly adopts a three-coordinate measuring instrument for detection or a powder grinding method for detection, the three-coordinate measuring instrument is adopted, the detection cost is high, the detection efficiency is low, the requirement on the technical level of an operator is higher, the full detection of the spherical butterfly gaskets produced in large batch is difficult to realize, the detection can only be carried out by adopting a spot inspection mode, and the product quality is difficult to effectively ensure. The detection by the powder grinding method has high requirements on the technical level of operators and low detection efficiency, and is not suitable for full detection in mass production due to the factors of manual operation and judgment.

In order to solve the technical problem, a Chinese utility model patent named as a spherical butterfly gasket detection clamp with the patent number of CN201520359404.X introduces a detection clamp, which comprises a lower gauge body and an upper gauge body, wherein the lower gauge body is provided with a cylindrical guide post, a male die is arranged at the top end of the guide post, and the center of the male die is provided with a positioning blind hole; the lower end of the upper gauge body is provided with a positioning guide hole, the top end of the positioning guide hole is provided with a female die, the upper gauge body is provided with a guide rod hole, the guide rod is sleeved in the guide rod hole in a sliding mode, the lower end of the guide rod is provided with a conical pressure head, and the pressure head extends out of the female die and abuts against the bottom surface of the positioning blind hole; the shaft sleeve of the dial indicator is sleeved in the clamping sleeve and is pressed tightly by the hoop, the clamping sleeve is positioned and pressed tightly at the upper end of the guide rod hole through the set screw, and the measuring needle of the dial indicator abuts against the upper end of the guide rod. Whether the butterfly gasket is qualified or not can be judged and detected by reading the data of the micrometer. The spherical butterfly-shaped gasket is fast and effective in detection, and the detection efficiency is improved. However, the method needs the upper gauge body and the lower gauge body to be completely attached to the butterfly-shaped gasket, that is, a set of detection clamp is needed for the butterfly-shaped gasket of one specification, and a complete set of detection clamp design method is needed for designing the detection clamp for the butterfly-shaped gasket in order to ensure that each set of detection clamp designed can be matched with the butterfly-shaped gasket to be detected.

Disclosure of Invention

The invention aims to solve the technical problems mentioned in the background art, and provides a design method and a detection method of a detection tool for a butterfly gasket of a differential.

The technical scheme of the invention is as follows: a design method of a detection tool for a butterfly gasket of a differential is characterized by comprising the following steps: the checking fixture for detecting the differential butterfly gasket comprises a measuring body with a spherical groove and a measuring ball, wherein the measuring body is used for supporting the butterfly gasket to be detected, and the measuring ball is placed on the butterfly gasket to be detected;

calculating the sphere diameter M of a measuring sphere in the design check tool according to the nominal value S of the inner diameter size of the butterfly gasket and the lower tolerance limit of the nominal value S of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket; and calculating and designing the sphere diameter N of the groove of the measuring body in the checking fixture according to the nominal value S of the inner diameter dimension of the butterfly gasket, the nominal value of the thickness dimension of the butterfly gasket and the tolerance upper limit corresponding to the nominal values, and manufacturing the checking fixture for detecting the butterfly gasket according to the design parameters.

Further calculating the ball diameter M of the measuring ball in the design checking fixture according to the nominal value S of the inner diameter size of the butterfly gasket and the lower tolerance limit of the nominal value S of the inner diameter size of the butterfly gasket, so that the inner side edge of the central hole of the butterfly gasket is attached to the outer side of the lower ball body of the designed measuring ball;

and calculating the spherical diameter N of the groove of the measuring body in the design checking tool according to the nominal value S of the inner diameter dimension of the butterfly gasket, the nominal value of the thickness dimension of the butterfly gasket and the tolerance upper limit corresponding to the nominal values, so that the outer edge of the central hole of the butterfly gasket is attached to the bottom surface of the groove of the designed measuring body.

The further method for determining the sphere diameter M of the measuring sphere comprises the following steps:

M＝S+a

wherein: m-measuring the sphere diameter of the measuring sphere in the gauge;

s, a nominal value of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket;

a, the lower tolerance limit of the nominal value of the inner diameter dimension of the butterfly gasket in the design parameters of the butterfly gasket.

The further method for determining the sphere diameter N of the groove of the measuring body comprises the following steps:

N＝S+b+2+2f

wherein: n-measuring the sphere diameter of the spherical groove of the measuring body in the gauge;

s, a nominal value of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket;

b, tolerance upper limit of nominal value of inner diameter size of the butterfly gasket in design parameters of the butterfly gasket;

-nominal values of butterfly gasket thickness dimensions in butterfly gasket design parameters;

f is the tolerance upper limit of the nominal value of the thickness dimension of the butterfly gasket in the design parameters of the butterfly gasket.

A detection method of a butterfly gasket of a differential mechanism is characterized by comprising the following steps: designing and manufacturing a detection tool for detecting the butterfly gasket according to the design parameters of the butterfly gasket, wherein the detection tool comprises a measurement body with a spherical groove and a measurement ball, the measurement body is used for supporting the butterfly gasket to be detected, the measurement ball is placed on the butterfly gasket to be detected, and the ball diameter M of the measurement ball and the ball diameter N of the groove of the measurement body of the detection tool are obtained according to the nominal value S of the inner diameter size of the butterfly gasket, the nominal value of the thickness size of the butterfly gasket, and the lower tolerance limit and the upper tolerance limit corresponding to the nominal value in the design parameters of the;

during detection, the convex surface of the butterfly gasket to be detected is placed in the groove of the measuring body, the outer side edge of the center hole of the butterfly gasket to be detected is attached to the bottom surface of the groove, the measuring ball is placed in the concave surface of the butterfly gasket to be detected, the inner side edge of the center hole of the butterfly gasket to be detected is attached to the outer side of the lower portion of the measuring ball, the distance H from the bottom surface of the groove of the measuring body to the top surface of the measuring ball is measured and calculated, and whether the butterfly.

The further method for measuring and calculating the distance H from the bottom surface of the groove of the measuring body to the top surface of the measuring ball comprises the following steps: rotating the butterfly-shaped gasket to be detected and the measuring ball to fully contact with each other, measuring the height from the bottom surface of the measuring body to the top surface of the measuring ball, and subtracting the height from the bottom surface of the measuring body to the bottom surface of the groove to obtain a height value; rotating the butterfly gasket to be detected and the measuring ball again, and measuring and calculating to obtain another height value; repeating the steps, and selecting the minimum height value as H.

Further, the method for judging whether the butterfly gasket to be detected is qualified through H comprises the following steps: determining the maximum value H meeting the butterfly gasket design standard according to the nominal value S of the inner diameter dimension of the butterfly gasket, the nominal value of the thickness dimension of the butterfly gasket, the nominal value A of the central hole dimension of the butterfly gasket, and the lower tolerance limit and the upper tolerance limit corresponding to the nominal values in the design parameters of the butterfly gasket_maxAnd a minimum value H_minWhen H is at a maximum value of H_maxAnd a minimum value H_minAnd if so, proving that the butterfly gasket to be detected is qualified, otherwise, proving that the butterfly gasket to be detected is unqualified.

Further said maximum value H_maxAnd a minimum value H_minThe calculation method comprises the following steps:

wherein: h_max-the maximum height from the bottom surface of the measuring body recess to the top surface of the measuring sphere that meets the butterfly gasket design criteria;

H_min-a minimum height from the bottom surface of the measuring body recess to the top surface of the measuring sphere that meets the butterfly gasket design criteria;

s is the nominal value of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket;

a-the nominal size tolerance lower limit of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket;

b-the upper limit of the nominal size tolerance of the inner diameter size of the butterfly gasket in the design parameters of the butterfly gasket;

a is the nominal value of the aperture size of the butterfly gasket central hole in the butterfly gasket design parameters;

c, nominal size tolerance lower limit of the aperture of the central hole of the butterfly gasket in the design parameters of the butterfly gasket;

d is the upper limit of the nominal size tolerance of the aperture of the central hole of the butterfly gasket in the design parameters of the butterfly gasket;

-nominal value of butterfly gasket thickness dimension in butterfly gasket design parameters;

e is the nominal size tolerance lower limit of the thickness size of the butterfly gasket in the design parameters of the butterfly gasket;

f-nominal dimensional tolerance upper limit for butterfly gasket thickness dimension in butterfly gasket design parameters.

According to the design method, the check tool is designed according to the design parameters of the butterfly gasket of the differential mechanism, the actual condition of the butterfly gasket can be better reflected by the obtained check tool, the check tool is extremely simple, the detection efficiency of the butterfly gasket can be greatly improved, the detection precision of the butterfly gasket is improved, the manufacturing difficulty of the check tool is reduced, and the popularization value is high.

Drawings

FIG. 1: the invention discloses a butterfly gasket, a measuring body and a measuring ball geometric relation schematic diagram (O)₁To measure the sphere center);

FIG. 2: the invention is a butterfly gasket, a measuring ball geometric relationship diagram (O)₂Is the butterfly gasket center);

FIG. 3: the invention is a butterfly gasket, a measuring body geometric relationship diagram (O)₃Is the center of the sphere of the measuring body groove);

wherein: 1-butterfly gaskets; 2-a measuring body; and 3, measuring the ball.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

As shown in fig. 1, which is a schematic structural diagram of a differential butterfly gasket of this embodiment, the most important of the design parameters of the butterfly gasket 1 of this embodiment is three parameters, which are a butterfly gasket inner diameter (the inner diameter of this embodiment is a diameter of an inner side of the butterfly gasket, that is, 2 times a distance from a side of the butterfly gasket facing a center of a sphere to the center of the sphere) dimension α, a butterfly gasket central hole dimension β in the butterfly gasket design parameters, and a butterfly gasket thickness dimension γ in the butterfly gasket design parameters, where a nominal value of the butterfly gasket inner diameter dimension α in the butterfly gasket design parameters is S, a nominal dimensional tolerance lower limit of the inner diameter dimension is a, and a nominal dimensional tolerance upper limit of the inner diameter dimension is b; the nominal value of the central hole diameter beta of the butterfly gasket in the design parameters of the butterfly gasket is A, the lower limit of the nominal size tolerance of the central hole diameter is c, and the upper limit of the nominal size tolerance of the central hole diameter is d; the nominal value of the thickness gamma of the butterfly gasket in the design parameters of the butterfly gasket is that the lower limit of the nominal size tolerance of the thickness is e, and the upper limit of the nominal size tolerance of the thickness is f. The parameters are design parameters of the butterfly gasket and can be directly obtained through a design drawing.

The design and manufacture check tool comprises a measuring body 2 with a spherical groove and a spherical measuring ball 3, the design check tool is used for determining the ball diameter N of the groove of the measuring body 2 (the ball diameter N of the embodiment refers to the diameter of the groove) and the ball diameter M of the measuring ball 3 (the ball diameter M of the embodiment refers to the diameter of the measuring ball), the design method of the embodiment is to determine the ball diameter N of the groove of the measuring body and the ball diameter M of the measuring ball according to the nominal value S of the inner diameter size and the nominal value of the thickness size of the butterfly gasket in the design parameters of the butterfly gasket and the lower tolerance limit and the upper tolerance limit corresponding to the nominal values, and the specific calculation method is as follows:

M＝S+a

N＝S+b+2+2f

the measuring body and the measuring ball are designed and manufactured according to the formula, the measuring ball 3 and the measuring body 2 in the checking fixture designed like this can ensure that the butterfly-shaped gasket to be checked can be completely attached to the bottom surface of the groove of the measuring body 2 in the detection process of the butterfly-shaped gasket to be checked, namely, the butterfly-shaped gasket to be checked and the groove of the measuring body 2 are in an internally-cut state, the inner side edge of the central hole of the butterfly-shaped gasket to be checked can be completely attached to the outer side of the ball of the lower half part of the measuring body 2, namely, the ball of the lower half part.

After the measuring ball 3 and the measuring body 2 are manufactured, the butterfly-shaped gasket to be detected is detected, and the specific detection method comprises the following steps:

the measuring body 2 is placed on a horizontal table, the butterfly-shaped gasket 1 to be detected is placed in the measuring body 2, the position is adjusted, red gall powder is smeared, the measuring ball 3 is placed, and the measuring ball 3 is rotated, so that the measuring body 2, the butterfly-shaped gasket 1 to be detected and the measuring ball 3 are in full contact. Measuring the distance H from the bottom surface of the groove of the measuring body 2 to the top surface of the measuring ball 3, if the range (H) is satisfied_min，H_max) And if the workpiece is not satisfied, the workpiece is unqualified. If the height between the horizontal platform and the top surface of the measuring ball 3 is measured, the distance between the bottom surface of the groove of the measuring body 2 and the horizontal platform needs to be subtracted from the height measurement, and meanwhile, qualitative analysis can be carried out according to the uniformity of the red gall powder.

During actual measurement, repeated measurement is needed, the butterfly-shaped gasket 1 to be measured and the measuring ball 3 are rotated to be fully contacted, the height from the bottom surface of the measuring body 2 to the top surface of the measuring ball 3 is measured, and the height from the bottom surface of the measuring body 2 to the bottom surface of the groove is subtracted to obtain a height value; rotating the butterfly gasket 1 to be detected and the measuring ball 3 again, and measuring and calculating to obtain another height value; repeating the steps, and selecting the minimum height value as H.

As shown in fig. 2 to 3, when the butterfly gasket to be tested of the embodiment is tested according to the above process, the measuring ball 3 is placed on the butterfly gasket 1 to be tested, the bottom surface of the measuring ball 3 will intrude into the central hole of the butterfly gasket 1 to be tested, and the height of the measuring ball intruding into the central hole is defined as Δ₁The distance from the bottom surface of the measuring ball to the bottom surface of the groove of the measuring body is defined as Δ₂The calculation can obtain:

then substituting the height H into a height H calculation formula according to the geometric relation to obtain:

H＝M+γ-(Δ₁-Δ₂)

it can be seen that the formula for H is:

according to the above formula, the design parameters of the butterfly gasket are substituted into the above formula for function analysis, and the maximum height H from the bottom surface of the groove of the measuring body to the top surface of the measuring ball, which meets the design standard of the butterfly gasket, can be known_maxCan be calculated according to the following formula:

the minimum height H from the bottom of the groove of the measuring body to the top of the measuring ball, which meets the design standard of the butterfly gasket, can be known_minCan be calculated according to the following formula:

in actual measurement, only the measured H and the maximum value H are required_maxAnd a minimum value H_minAnd comparing to judge whether the butterfly gasket to be detected is qualified or not.

For the exemplary embodiment, the butterfly gasket has a design parameter in which the butterfly gasket inner diameter dimension α isButterfly gasket center hole size β isThe butterfly gasket thickness dimension gamma is 1+ -0.02.

The design size of the checking fixture is as follows: the ball diameter M of the measuring ball is 97.6, and the contact conditions of the measuring ball and the measuring ball are consistent when the measuring ball is larger than M within the size range (97.6 and 97.7), namely the maximum value and the minimum value of the inner diameter of the butterfly gasket are larger than the ball diameter of the measuring ball, and the contact conditions of the gasket and the measuring ball within the value range belong to inner tangency due to the selection of the size of the measuring ball).

The spherical diameter N of the groove of the measuring body is 97.6+0.1+ (1+0.02) × 2, and the outer diameter sizes of the butterfly gaskets are confirmed to be (99.58,99.74), which are both smaller than the spherical diameter size of the measuring body, and the contact conditions of the two (namely the maximum value and the minimum value of the outer diameter sizes of the butterfly gaskets are both smaller than the spherical diameter size of the measuring body) are consistent.

According to the height dimension requirement, the maximum height H of the design standard is met_max98.6190, height minimum H_minAt 98.5785, the butterfly pad to be tested is then tested according to the procedure described above.

When the height measured by the butterfly gasket to be detected is between (98.5785,98.6190), the butterfly gasket to be detected is qualified, otherwise, the butterfly gasket is unqualified.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.