CN109059733B - Rapid detection method for countersunk depth of flat head screw - Google Patents
Rapid detection method for countersunk depth of flat head screw Download PDFInfo
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- CN109059733B CN109059733B CN201810968538.XA CN201810968538A CN109059733B CN 109059733 B CN109059733 B CN 109059733B CN 201810968538 A CN201810968538 A CN 201810968538A CN 109059733 B CN109059733 B CN 109059733B
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- bottom plate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/18—Measuring arrangements characterised by the use of mechanical techniques for measuring depth
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Abstract
The invention discloses a quick detection method for the depth of a countersunk hole of a flat head screw, which adopts the technical scheme that: the invention uses the existing measuring gauge (height gauge, inside and outside diameter micrometer, standard tungsten steel ball) to measure, and obtains the countersunk depth h more accurately by calculation, compared with the prior art, the invention has the beneficial effects that: the detection method has the advantages of simple mode, high measurement efficiency, simple detection device and low detection cost, and can be completed by common quality personnel.
Description
Technical Field
The invention relates to the technical field of countersunk hole detection, in particular to a quick detection method for the countersunk hole depth of a flat-head screw or a flat-head rivet.
Background
The existing many punched parts are provided with the salad holes, the tolerance requirements of the hole depth h and the hole diameter d are high, and frequent detection is needed in production.
At present, the depth h is detected mainly by using a three-coordinate measuring instrument or a projector for projection. Although the two measurement methods are accurate in measurement, the three-coordinate measuring instrument and the projector are expensive in equipment, high in environmental requirement, low in measurement speed and low in efficiency, and need special quality personnel to operate, so that the measurement cost is very high.
Disclosure of Invention
Aiming at the problems, the invention aims to provide a method for rapidly detecting the depth of a countersunk head hole of a flat head screw, which can rapidly and accurately measure the depth of the countersunk head by adopting a simple device and a simple structure, greatly reduces the cost, has low requirement on the environment in the measuring process, and has high measuring speed and high efficiency.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a quick detection method for the depth of a countersunk hole of a flat head screw comprises the following steps:
A. preparing a height gauge, an inner micrometer, an outer micrometer and a standard tungsten steel ball;
B. removing burrs at the edge and the orifice of the part, wiping off oil stains on the surface, arranging a detection bottom plate, fixing a height gauge, and cleaning the surface of the bottom plate;
C. respectively resetting an inside micrometer and an outside micrometer to zero, and then measuring the material thickness t and the bottom hole diameter d of the part to be measured;
D. taking the upper surface of a bottom plate as a reference, zeroing the height gauge, then, flatly placing a countersunk head of a part to be measured on the bottom plate upwards, placing a standard tungsten steel ball in the countersunk head of the part to be measured, wherein the standard tungsten steel ball does not interfere with the bottom plate, the standard tungsten steel ball and the bottom plate are separated and do not contact with each other, placing a gauge head of the height gauge at the highest position of the steel ball, measuring the height H, intersecting extension lines of two bevel edges of a countersunk hole to form a point E, and recording the distance from the center O of the standard tungsten steel ball to;
E. rapidly calculating the depth of the countersunk head according to the measured value;
wherein, the angles of the forming punch heads with the countersunk angle a are consistent and known, the diameter of the standard tungsten steel ball is known,
l = h+h1+h2；
h1=H-R-t；
from the trigonometric function, l = R/sin (a/2), h2= d/[2tan (a/2) ];
therefore, H = l-H1-H2= R/sin (a/2) -H + R + t-d/[ 2tan (a/2) ], the size of the countersunk head depth can be rapidly detected by the calculator.
Preferably, a square groove is formed in the bottom plate, and the length of the square groove is smaller than that of the part to be detected.
Preferably, the bottom plate is made of a magnetic material, and during detection, the part to be detected can be attracted with the bottom plate to fix the part to be detected.
Preferably, the square groove is internally provided with a rotary scraping mechanism for cleaning the placing surface of the part to be detected, and the rotary scraping mechanism can clean impurities on the contact surface of the part to be detected and the bottom plate before detection at every time, so that the part to be detected and the bottom plate can be hidden and used conveniently.
Preferably, the rotary scraping mechanism comprises a fixed cylinder, a compression spring and a blade type rotating wing, wherein the bottom end of the compression spring is fixed in the fixed cylinder, and the top end of the compression spring is fixedly connected with the blade type rotating wing.
Preferably, an adjusting cylinder with a closed bottom and an open upper end is arranged at the top end of the compression spring, three adjusting grooves are equidistantly formed in the side wall of the adjusting cylinder, and each blade type rotating wing can extend outwards and contract inwards in the adjusting groove.
Preferably, the blade-type rotating wing is provided with a clamping hole, and a clamping thin plate which is in clamping connection with the clamping hole is arranged in the square groove along the radial direction of the fixed cylinder.
Preferably, the blade-type rotating wing is provided with three blades, the included angle between every two blades is 120 degrees, the clamping holes in the three blade-type rotating wings are arranged in a staggered mode, and the clamping holes in the three blade-type rotating wings are respectively formed in the head end, the middle and the tail end of the blade-type rotating wings.
The invention has the beneficial effects that: the detection method has the advantages of simple mode, high measurement efficiency, simple detection device and low detection cost, and can be completed by common quality personnel.
Drawings
FIG. 1 is a front view of a part to be tested according to the present invention.
FIG. 2 is a schematic view of the measurement process of the present invention.
FIG. 3 is an enlarged view of the measurement process of the present invention.
Fig. 4 is a diagram of a measurement process of the prior art.
Fig. 5 is a schematic view of the retracting rotary scraping mechanism of the present invention.
Fig. 6 is a view showing the connection relationship between the adjusting cylinder and the blade type rotary wing according to the present invention.
Wherein: 1-height gauge, 2-standard tungsten steel ball, 3-part, 4-bottom plate, 5-square groove, 6-fixed cylinder, 7-compression spring, 8-blade type rotating wing, 9-clamping hole, 10-adjusting cylinder, 11-clamping thin plate and 12-adjusting groove.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the following further describes the technical solution of the present invention with reference to the drawings and the embodiments.
Fig. 4 is a schematic view of a prior art test, a part of QSTE380TM T =3.7mm material, produced in large quantities. The method for detecting the old countersunk hole comprises the following steps: the test was performed using a three-coordinate measuring machine.
The defects of the old method are as follows: the method has extremely low measuring speed and high cost.
The first embodiment is as follows: referring to fig. 2-4, a method for rapidly detecting the depth of a countersunk hole of a flat head screw,
the method comprises the following steps:
A. preparing a height gauge 1, an inner micrometer, an outer micrometer and a standard tungsten steel ball 2;
B. removing burrs at the edge and the orifice of the part 3, wiping off oil stains on the surface, arranging a detection bottom plate 4, fixing the height gauge 1, and cleaning the surface of the bottom plate 4;
C. respectively resetting the inside micrometer and the outside micrometer to zero, and then measuring the material thickness t and the bottom hole diameter d of the part 3 to be measured;
D. taking the upper surface of a bottom plate 4 as a reference, zeroing a height gauge 1, then flatly placing a countersunk head of a part 3 to be measured on the bottom plate 4 upwards, placing a standard tungsten steel ball 2 in the countersunk head of the part 3 to be measured, wherein the standard tungsten steel ball 2 does not interfere with the bottom plate 4, the standard tungsten steel ball and the bottom plate are separated and are not in contact with each other, placing a measuring head of the height gauge 1 at the highest position of the steel ball, measuring the height H, intersecting extension lines of two bevel edges of a countersunk hole to form a point E, and recording the distance from the center O of the circle of the standard tungsten;
a square groove 5 is arranged on the bottom plate 4, the length of the square groove 5 is less than that of the part 3 to be measured, the bottom plate 4 is made of magnetic materials, the part 3 to be detected can be attracted with the bottom plate 4 to fix the part 3 to be detected during detection, the bottom plate 4 is made of magnetic materials, and because the flat head screw can be attracted with the magnetic materials, the position is fixed by the principle that the bottom plate 4 and the flat head screw are automatically attracted in the detection process, the situation that the position of the flat head screw slightly moves in the detection process to influence the accuracy of detection data is prevented, the magnet can also be an electromagnet, when the electromagnet is adopted, the bottom plate 4 is magnetic when the electromagnet is electrified, the bottom plate 4 is not magnetic when the electromagnet is not electrified, the electromagnet is electrified when the electromagnet is detected, the flat-head screw and the part 3 to be detected are attracted and fixed, and when the electromagnet is powered off after the detection is finished, the magnetism disappears, the flat-head screw is quickly taken away, and the next flat-head screw is detected;
as shown in fig. 5 and 6, a rotary scraping mechanism for cleaning the placing surface of the to-be-detected part 3 is further arranged in the square groove 5, the rotary scraping mechanism can clean impurities on the contact surface of the to-be-detected part 3 and the bottom plate 4 before each detection, so as to be convenient for hiding and using, the rotary scraping mechanism comprises a fixed cylinder 6, a compression spring 7 and blade type rotating wings 8, an adjusting cylinder 10 with a closed bottom and an open upper end is arranged at the top end of the compression spring 7, three adjusting grooves 12 are equidistantly arranged on the side walls of the adjusting cylinder 10, each blade type rotating wing 8 can extend outwards and contract inwards in the adjusting groove 12, a guide column is arranged in the compression spring 7 in the actual use process, the compression spring 7 is guided, and a U-shaped rail can be arranged at the notch of each adjusting groove 12 for the adjustment direction in the actual use, the blade type rotating wings 8 are convenient to stretch and retract, and labor is saved; the bottom end of the compression spring 7 is fixed in the fixed cylinder 6, the top end of the compression spring is fixedly connected with the blade type rotating wing 8, the blade type rotating wing 8 is provided with clamping holes 9, clamping thin plates 11 which are in clamping connection with the clamping holes 9 are radially arranged in the square groove 5 along the fixed cylinder 6, the blade type rotating wing 8 is provided with three blades, the included angle between every two blades is 120 degrees, the clamping holes 9 in the three blade type rotating wings 8 are staggered, and the clamping holes 9 in the three blade type rotating wings 8 are respectively arranged at the head end, the middle and the tail end of the blade type rotating wings 8; in the detection process, tiny small-particle metal impurities which are not easy to see exist on the detection surface of the bottom plate 4 inevitably, and the existence of the small-particle metal impurities can directly influence the detection precision, so the surface of the bottom plate 4 contacted with the part 3 to be detected is clean and free of impurities before detection, the operation is convenient, the detection process is simplified, the rotary scraping mechanism is arranged, before detection, the blade type rotating wings 8 are manually rotated, the contact surface is quickly cleaned through the blade type rotating wings 8 in the rotating process, after the cleaning is finished, the compression springs 7 are compressed and are placed in the fixed cylinder 6, and meanwhile, the blade type rotating wings 8 are tightly clamped and connected with the clamping thin plate 11 through the clamping holes 9 for the next operation, the structure is simple, the use is convenient and convenient, the storage is convenient, the use of the standard tungsten steel ball 2 is not influenced, and the accuracy of the detection data is further improved in an auxiliary manner, the rotary scraping mechanism of the invention is not attracted with the bottom plate 4;
during operation, the clamping hole 9 of the blade type rotating wing 8 is separated from the clamping thin plate 11, the blade type rotating wing 8 is moved upwards, when the blade type rotating wing 8 moves to the upper surface of the bottom plate 4, the three blade type rotating wings 8 are pushed outwards through the adjusting grooves 12 manually, the circular area surrounded by the blade type rotating wings 8 is larger than the area of the square groove 5, the adjusting cylinder 10 is rotated manually for a circle, the three blade type rotating wings 8 also rotate for a circle, and in the rotating process, fine particle impurities on the surface are completely removed through close contact between the blade type rotating wings 8 and the surface of the bottom plate 4, so that the operation is simple and convenient;
in the invention, after the blade type rotating wing 8 is contracted, the top end of the blade type rotating wing is lower than the depth of the square groove 5, and during detection, the contracted blade type rotating wing 8 can not be contacted with the standard tungsten steel ball 2 so as to avoid influencing the detection accuracy;
E. rapidly calculating the depth of the countersunk head according to the measured value;
wherein, the angle of the forming punch with the countersunk angle a is consistent and known, the diameter of the standard tungsten steel ball 2 is known,
l = h+h1+h2；
h1=H-R-t；
from the trigonometric function, l = R/sin (a/2), h2= d/[2tan (a/2) ];
thus H = l-H1-H2= R/sin (a/2) -H + R + t-d/[ 2tan (a/2) ];
the counter sinking depth can be rapidly detected through the calculator.
In the second embodiment, different from the first embodiment, the bottom plate 4 is a flat plate made of a material such as ordinary iron, stainless steel, or alloy, and has no magnetism.
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 described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. A quick detection method for the depth of a countersunk hole of a flat head screw is characterized by comprising the following steps:
A. preparing a height gauge, an inner micrometer, an outer micrometer and a standard tungsten steel ball;
B. removing burrs at the edge and the orifice of the part, wiping off oil stains on the surface, arranging a detection bottom plate, fixing a height gauge, and cleaning the surface of the bottom plate; a square groove is formed in the bottom plate, and the length of the square groove is smaller than that of the part to be detected;
a rotary scraping mechanism for cleaning the placing surface of the part to be detected is arranged in the square groove, and the rotary scraping mechanism can be used for cleaning impurities on the contact surface of the part to be detected and the bottom plate before detection every time, so that the part to be detected and the bottom plate can be hidden and used conveniently;
the rotary scraping mechanism comprises a fixed cylinder, a compression spring and a blade type rotating wing, wherein the bottom end of the compression spring is fixed in the fixed cylinder, and the top end of the compression spring is fixedly connected with the blade type rotating wing;
the top end of the compression spring is provided with an adjusting cylinder with a closed bottom and an open upper end, the side wall of the adjusting cylinder is equidistantly provided with three adjusting grooves, and each blade type rotating wing can extend outwards and contract inwards in the adjusting groove;
the blade type rotating wing is provided with a clamping hole, and a clamping thin plate which is connected with the clamping hole in a clamping manner is arranged in the square groove along the radial direction of the fixed cylinder;
the blade type rotating wings are provided with three blades, the included angle between every two blades is 120 degrees, the clamping holes in the three blade type rotating wings are arranged in a staggered mode, and the clamping holes in the three blade type rotating wings are respectively arranged at the head end, the middle and the tail end of the blade type rotating wings;
C. respectively resetting an inside micrometer and an outside micrometer to zero, and then measuring the material thickness t and the bottom hole diameter d of the part to be measured;
D. taking the upper surface of a bottom plate as a reference, zeroing the height gauge, then, flatly placing a countersunk head of a part to be measured on the bottom plate upwards, placing a standard tungsten steel ball in the countersunk head of the part to be measured, wherein the standard tungsten steel ball does not interfere with the bottom plate, the standard tungsten steel ball and the bottom plate are separated and do not contact with each other, placing a gauge head of the height gauge at the highest position of the steel ball, measuring the height H, intersecting extension lines of two bevel edges of a countersunk hole to form a point E, and recording the distance from the center O of the standard tungsten steel ball to;
E. rapidly calculating the depth of the countersunk head according to the measured value;
wherein the countersunk angle a is consistent with the angle of the forming punch and is known, the diameter of the standard tungsten steel ball is known,
l = h+h1+h2；h1=H-R-t；
as known from trigonometric functions, l = R/sin (a/2), h2= d/[2tan (a/2) ];
therefore, H = l-H1-H2= R/sin (a/2) -H + R + t-d/[ 2tan (a/2) ], and the size of the depth of the countersunk head is rapidly detected by a calculator.
2. The method for rapidly detecting the depth of the countersunk hole of the flat head screw according to claim 1, which is characterized in that: the bottom plate is made of magnetic materials, and when the detection is carried out, the part to be detected can be attracted with the bottom plate so as to fix the part to be detected.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810968538.XA CN109059733B (en) | 2018-08-23 | 2018-08-23 | Rapid detection method for countersunk depth of flat head screw |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810968538.XA CN109059733B (en) | 2018-08-23 | 2018-08-23 | Rapid detection method for countersunk depth of flat head screw |
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| CN109059733A CN109059733A (en) | 2018-12-21 |
| CN109059733B true CN109059733B (en) | 2020-12-08 |
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| CN201810968538.XA Active CN109059733B (en) | 2018-08-23 | 2018-08-23 | Rapid detection method for countersunk depth of flat head screw |
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| CN113945169A (en) * | 2021-10-21 | 2022-01-18 | 西北工业大学 | System and method for measuring key sizes of straight holes and nest holes |
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| CN104713459A (en) * | 2015-04-01 | 2015-06-17 | 航天精工股份有限公司 | Double-sphere measurement method for counter bore angle |
| CN204854587U (en) * | 2015-09-02 | 2015-12-09 | 江门市力泰科技有限公司 | Countersunk head degree of depth measuring apparatu of counter sink |
| CN207231364U (en) * | 2017-10-13 | 2018-04-13 | 郑州郑飞机械有限责任公司 | A kind of counter sink aperture measurement device |
| CN108225251A (en) * | 2018-03-30 | 2018-06-29 | 厦门太古飞机工程有限公司 | Cone shaped countersink aided measurement device |
-
2018
- 2018-08-23 CN CN201810968538.XA patent/CN109059733B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3769713A (en) * | 1970-11-27 | 1973-11-06 | P Norman | External can seam checking apparatus |
| CN104713459A (en) * | 2015-04-01 | 2015-06-17 | 航天精工股份有限公司 | Double-sphere measurement method for counter bore angle |
| CN204854587U (en) * | 2015-09-02 | 2015-12-09 | 江门市力泰科技有限公司 | Countersunk head degree of depth measuring apparatu of counter sink |
| CN207231364U (en) * | 2017-10-13 | 2018-04-13 | 郑州郑飞机械有限责任公司 | A kind of counter sink aperture measurement device |
| CN108225251A (en) * | 2018-03-30 | 2018-06-29 | 厦门太古飞机工程有限公司 | Cone shaped countersink aided measurement device |
Non-Patent Citations (1)
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