CN114001945B - Method for automatically judging self-tapping point in metal bone screw self-tapping experiment - Google Patents
Method for automatically judging self-tapping point in metal bone screw self-tapping experiment Download PDFInfo
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- CN114001945B CN114001945B CN202111290942.4A CN202111290942A CN114001945B CN 114001945 B CN114001945 B CN 114001945B CN 202111290942 A CN202111290942 A CN 202111290942A CN 114001945 B CN114001945 B CN 114001945B
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- 238000010079 rubber tapping Methods 0.000 title claims abstract description 94
- 210000000988 bone and bone Anatomy 0.000 title claims abstract description 45
- 239000002184 metal Substances 0.000 title claims abstract description 45
- 238000002474 experimental method Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000006073 displacement reaction Methods 0.000 claims abstract description 21
- 238000012417 linear regression Methods 0.000 claims abstract description 9
- 238000012360 testing method Methods 0.000 description 16
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
- A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws, setting implements or the like
- A61B17/68—Internal fixation devices, including fasteners and spinal fixators, even if a part thereof projects from the skin
- A61B17/84—Fasteners therefor or fasteners being internal fixation devices
- A61B17/86—Pins or screws or threaded wires; nuts therefor
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B2017/00681—Aspects not otherwise provided for
- A61B2017/00725—Calibration or performance testing
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- Health & Medical Sciences (AREA)
- Orthopedic Medicine & Surgery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Engineering & Computer Science (AREA)
- Medical Informatics (AREA)
- Neurology (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
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- Public Health (AREA)
- Veterinary Medicine (AREA)
- Prostheses (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The method for automatically judging the self-tapping point in the self-tapping experiment of the metal bone screw comprises the following steps: pre-experiment is carried out on metal bone screw with certain specification and type, and time-displacement data are recorded; extracting data of a preset time period in the time-displacement data, wherein the preset time period comprises the occurrence moment of a self-tapping point; fitting a trend line of a time-displacement data curve by using a linear regression method according to the extracted data of the preset time period to obtain a threshold slope k; and (3) performing a self-tapping experiment of the metal bone screw to obtain a trend line slope k ', and automatically judging the time point with the k' being more than or equal to a threshold slope k as a self-tapping point. The method improves the efficiency and accuracy of the experiment, reduces the labor intensity and has better consistency.
Description
Technical Field
The invention relates to the field of testing, in particular to a method for automatically judging self-tapping points in a metal bone screw self-tapping experiment.
Background
At present, in the screw self-tapping experiment operation, usually, after a tester observes that the test torque or displacement curve appears according with the self-tapping characteristic feedback of standard description, the tester manually controls the test equipment to stop increasing the axial load force, and keeps the load force until the test is finished. The method for manually judging the screw to start self-tapping relies on observing the real-time change of a test torque curve or a displacement curve to determine that the self-tapping point is susceptible to the influence of the fluctuation of test data to cause misjudgment; and the occurrence time of the self-tapping point is generally judged manually to be later than the actual self-tapping starting time under the influence of observation and operation, and the degree of dispersion is judged to be larger through multiple tests. In this regard, how to improve experimental efficiency, accuracy and/or consistency is an urgent issue to be addressed.
Accordingly, there is a need to address one or more of the above-described problems by automatically determining the self-tapping point in a metal bone screw self-tapping experiment.
Disclosure of Invention
In order to solve at least one technical problem, according to an aspect of the present invention, a method for automatically determining a self-tapping point in a self-tapping experiment of a metal bone screw is provided, wherein a set of curve slope threshold values and time parameters can be calculated by analyzing a pre-experiment time-torque curve or a time-displacement curve, and the curve slope is determined in real time according to the time parameters in the experiment, so that the moment when the threshold values are met is automatically the self-tapping starting time.
Specifically, the method for automatically judging the self-tapping point in the self-tapping experiment of the metal bone screw is characterized by comprising the following steps:
pre-experiment is carried out on metal bone screw with certain specification and type, and time-displacement data are recorded;
Extracting data of a preset time period in the time-displacement data, wherein the preset time period comprises the occurrence moment of a self-tapping point;
Fitting a trend line of the time-displacement data curve by using a linear regression method according to the extracted data of the preset time period to obtain a trend line slope, and taking the trend line slope as a threshold slope k for judging a self-tapping point;
And (3) performing a self-tapping experiment of the metal bone screw, when the metal bone screw is judged to be of a certain specification and type, fitting time-displacement data in a preset time period by using a linear regression method, obtaining a trend line slope k ', automatically judging as a self-tapping point at a time point when k' is more than or equal to a threshold slope k, stopping increasing the axial load of the metal bone screw at the self-tapping point, and keeping the load force at the moment of the self-tapping point until the experiment is finished, wherein the load force is taken as the self-tapping force.
According to still another aspect of the present invention, the predetermined period of time is 1 second before and after the occurrence time of the self-tapping point.
According to a further aspect of the invention, the moment of occurrence of the self-tapping point is determined by an experienced person in the pre-experiment.
According to yet another aspect of the invention, the time-displacement data is replaced with time-torque data.
According to still another aspect of the present invention, pre-experiments are performed on metal bone screws of various specifications and types to obtain corresponding threshold slopes k, which are stored in a database with corresponding specifications and types.
According to yet another aspect of the invention, when conducting a metal bone screw self-tapping experiment, a threshold slope k corresponding to the specification and type of metal bone screw is looked up from the database.
According to still another aspect of the present invention, there is provided a method for self-tapping a metal bone screw, comprising the steps of:
according to the method, automatic judgment of the self-tapping point is carried out;
Automatically controlling a load applying device to stop increasing the axial load of the metal bone screw at the self-tapping point controller;
and maintaining the load force at the moment of the self-tapping point until the experiment is finished, and taking the load force as the self-tapping force.
The invention can obtain one or more of the following technical effects:
1. The test efficiency is improved.
2. The accuracy of the test is improved, and the labor intensity is reduced.
3. The experimental results have better consistency needles, and the test results of the metal bone screws have comparability, so that the effective test results are favorable for obtaining.
Drawings
The invention will be described in further detail with reference to the drawings and the detailed description.
FIG. 1 is a graph of time-torque data and trend lines (dashed lines) of a self-tapping point neighborhood in a metal bone screw self-tapping experiment according to a preferred embodiment of the present invention.
Fig. 2 is a diagram showing the result of a screw self-tapping automatic judging experiment performed by taking a threshold slope as a parameter according to a preferred embodiment of the present invention.
Detailed Description
The present invention is described in its best mode by the following preferred embodiments with reference to the accompanying drawings, and the detailed description herein is to be construed as limiting the invention, since various changes and modifications can be made without departing from the spirit and scope of the invention.
Example 1
According to a preferred embodiment of the invention, a method for automatically judging a self-tapping point in a self-tapping experiment of a metal bone screw is provided, and is characterized by comprising the following steps:
pre-experiment is carried out on metal bone screw with certain specification and type, and time-displacement data are recorded;
Extracting data of a preset time period in the time-displacement data, wherein the preset time period comprises the occurrence moment of a self-tapping point;
Fitting a trend line of the time-displacement data curve by using a linear regression method according to the extracted data of the preset time period to obtain a trend line slope, and taking the trend line slope as a threshold slope k for judging a self-tapping point;
And (3) performing a self-tapping experiment of the metal bone screw, when the metal bone screw is judged to be of a certain specification and type, fitting time-displacement data in a preset time period by using a linear regression method, obtaining a trend line slope k ', automatically judging as a self-tapping point at a time point when k' is more than or equal to a threshold slope k, stopping increasing the axial load of the metal bone screw at the self-tapping point, and keeping the load force at the moment of the self-tapping point until the experiment is finished, wherein the load force is taken as the self-tapping force.
The method is simple to realize, high in accuracy and strong in consistency, and can be used for judging self-tapping points of self-tapping tests of various metal bone screws.
According to a further preferred embodiment of the present invention, the predetermined period of time is 1 second before and after the occurrence time of the self-tapping point.
According to a further preferred embodiment of the invention, the moment of occurrence of the self-tapping point is determined in the preliminary experiment by an experienced person.
According to a further preferred embodiment of the invention, the time-displacement data is replaced by time-torque data.
According to a further preferred embodiment of the invention, pre-experiments are performed on metal bone screws of various specifications and types, corresponding threshold slopes k are obtained, and the threshold slopes k and the corresponding specifications and types are stored in a database.
According to a further preferred embodiment of the invention, when the metal bone screw self-tapping experiment is performed, the threshold slope k corresponding to the specification and type of the metal bone screw is searched from the database.
According to another preferred embodiment of the present invention, there is also provided a method for self-tapping an experimental metal bone screw, characterized by comprising the steps of:
according to the method, automatic judgment of the self-tapping point is carried out;
Automatically controlling a load applying device to stop increasing the axial load of the metal bone screw at the self-tapping point controller;
and maintaining the load force at the moment of the self-tapping point until the experiment is finished, and taking the load force as the self-tapping force.
According to still another preferred embodiment of the present invention, there is provided a method for automatically determining a self-tapping point in a self-tapping experiment of a metal bone screw, comprising the steps of:
1) Taking one self-tapping screw from a certain self-tapping screw with the same specification for a screw self-tapping experiment, determining a self-tapping point in a manual selection mode, and recording time-torque data;
2) Extracting data 1s before and after the occurrence time of the self-tapping point in the time-torque data acquired in the step 1);
3) Fitting a trend line of the time-torque data curve (curve near the self-tapping point) in the step 2) by using a linear regression method to obtain a trend line slope, and taking the slope as a threshold slope k for judging the self-tapping point;
4) In the self-tapping experiments of other screws with the same specification, a linear regression method is carried out on time-torque data in a set calculation time to calculate a trend line slope k ', so that when the time point of k' is greater than or equal to k, the self-tapping behavior occurrence time point is judged, at the moment, the axial load increase is stopped, the load force at the moment is kept until the experiment is finished, and the load force is taken as the self-tapping force.
1-2, Time-torque data and trend line (dotted line) graphs of the neighborhood of the self-tapping point in the metal bone screw self-tapping experiment and screw self-tapping automatic judging experimental results by taking the threshold slope as a parameter are respectively shown.
The invention can obtain one or more of the following technical effects:
1. The test efficiency is improved.
2. The accuracy of the test is improved, and the labor intensity is reduced.
3. The experimental results have better consistency needles, and the test results of the metal bone screws have comparability, so that the effective test results are favorable for obtaining.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The method for automatically judging the self-tapping point in the self-tapping experiment of the metal bone screw is characterized by comprising the following steps of:
pre-experiment is carried out on metal bone screw with certain specification and type, and time-displacement data are recorded;
Extracting data of a preset time period in the time-displacement data, wherein the preset time period comprises the occurrence moment of a self-tapping point;
Fitting a trend line of the time-displacement data curve by using a linear regression method according to the extracted data of the preset time period to obtain a trend line slope, and taking the trend line slope as a threshold slope k for judging a self-tapping point;
When the metal bone screw is judged to be of a certain specification and type, fitting time-displacement data in a preset time period by utilizing a linear regression method to obtain a trend line slope k ', automatically judging a time point with k' being more than or equal to a threshold slope k as a self-tapping point, automatically controlling a load applying device to stop increasing the axial load of the metal bone screw by the self-tapping point controller and keeping the load force at the moment of the self-tapping point until the experiment is finished, and taking the load force as the self-tapping force.
2. The method for automatically judging the self-tapping point in the self-tapping experiment of the metal bone screw according to claim 1, wherein the predetermined time period is 1 second before and after the occurrence time of the self-tapping point.
3. The method for automatically judging self-tapping points in self-tapping experiments of metal bone screws according to claim 1 or 2, wherein the time-displacement data is replaced by time-torque data.
4. The method for automatically judging self-tapping points in the metal bone screw self-tapping experiments according to claim 3, wherein pre-experiments are performed on metal bone screws of various specifications and types to obtain corresponding threshold slopes k, and the threshold slopes k and the corresponding specifications and types are stored in a database.
5. The method for automatically judging self-tapping points in metal bone screw self-tapping experiments according to claim 4, wherein when the metal bone screw self-tapping experiments are performed, a threshold slope k corresponding to the specification and type of the metal bone screw is searched from the database.
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| CN202111290942.4A CN114001945B (en) | 2021-11-02 | 2021-11-02 | Method for automatically judging self-tapping point in metal bone screw self-tapping experiment |
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| CN202111290942.4A CN114001945B (en) | 2021-11-02 | 2021-11-02 | Method for automatically judging self-tapping point in metal bone screw self-tapping experiment |
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| CN114001945A CN114001945A (en) | 2022-02-01 |
| CN114001945B true CN114001945B (en) | 2024-06-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| NL137880C (en) * | 1968-01-09 | |||
| CN102607954B (en) * | 2012-03-16 | 2013-12-04 | 国电联合动力技术有限公司 | Test method for judging high-strength bolt to be yield or not |
| CN103090764B (en) * | 2013-01-14 | 2015-05-20 | 南车株洲电力机车有限公司 | Detection method of self-trapping threaded sleeve drilling bottom hole and anti-stretching and anti-twist values |
| DE102014214622A1 (en) * | 2014-07-25 | 2016-01-28 | Arnold Umformtechnik Gmbh & Co. Kg | Method and device for screw threading screwing |
| CN104257425A (en) * | 2014-10-22 | 2015-01-07 | 毕宏政 | Self-tapping type bolt with annular gauge |
| CN105004516B (en) * | 2015-07-08 | 2017-11-10 | 上海大学 | Controllable feeding type medical bone screw reverses test device |
| CN108765504A (en) * | 2018-05-29 | 2018-11-06 | 上海视疆科学仪器有限公司 | A kind of method of variegated particle in quick screening high-velocity particles stream |
| CN113560860B (en) * | 2020-04-28 | 2022-05-13 | 北京福田康明斯发动机有限公司 | Bolt tightening method |
| CN112393886A (en) * | 2020-10-09 | 2021-02-23 | 浙江华远汽车零部件有限公司 | Detection and reworking process for self-tapping screw |
| CN112697416A (en) * | 2020-12-23 | 2021-04-23 | 德检(江苏)检测技术有限公司 | Method for testing structure stability of universal screw and bone plate |
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Non-Patent Citations (1)
| Title |
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| 国家食品药品监督管理总局.外科植入物 金属接骨螺钉自攻性能试验方法：YY/T 1505-2016.2016,第1-12页. * |
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