JP2023014432A - Deflection measuring device, deflection measuring method and quality control method - Google Patents

Abstract

To provide: a method which efficiently and automatically measures deflection amounts of a large number of shafts, and a deflection measuring device and a deflection measuring method which are significantly improved in variation of measurement values; and further a highly reliable quality control method using these measuring methods.SOLUTION: A deflection measuring method includes: fixing one end side of a shaft; applying a load on a peripheral surface on the other end side of the shaft; and measuring a deflection amount of the shaft. The load matches a repulsion force acting in a radial direction of the shaft at a spot where the load is applied to the shaft. A quality control method includes: calculating variation in data of the deflection amounts acquired by the deflection measuring method: and performing success/failure determination about a property of the shaft based on the variation.SELECTED DRAWING: Figure 4

Description

Application for application of Article 30, Paragraph 2 of the Patent Act is filed ▲1 ▼ Publication date November 1, 2021 ▲2 ▼ Publications, etc. https://www. youtube. com/watch? v=xggmelu1k74 (1) Release date: November 2, 2021 (2) Publications, etc. https://www. youtube. com/watch? v=xggmelu1k74

TECHNICAL FIELD The present invention relates to a shaft deflection measuring method, a measuring device, and a quality control method using them, and more specifically, to measure the deflection of a golf club shaft (carbon shaft, resin shaft, or metal shaft) with high accuracy. The present invention relates to a shaft deflection measuring method and apparatus, and a quality control method using them.

Conventionally, as methods for measuring the deflection of shafts used in golf clubs and the like, for example, weight-type measuring methods and natural frequency measuring methods have been used.

FIG. 1 is a schematic diagram for explaining the outline of these conventional methods.
In the weight-type measurement method, one end (grip side) of the shaft is horizontally fixed, and a weight of a predetermined weight is hung at a predetermined position on the other end (head side) to bend the shaft vertically downward. This is a measurement method in which the amount of deflection is read using a scale such as a scale.

The natural frequency measurement method is to horizontally fix one end of the shaft (grip side), attach a weight of a predetermined weight to a predetermined position on the other end (head side), bend the shaft to a certain amount, and then release it. to vibrate. And it is a method of measuring the frequency at that time.

However, the weight-type measuring method is basically manual and takes a long time to measure, and it is difficult to measure all of a large number of shafts. In addition, there was a large variation in the measured values, which lacked reliability in terms of quality assurance. In addition, when measuring the natural frequency of a carbon shaft, for example, the direction of vibration may become slanted due to the so-called curl characteristic of the carbon shaft. There was a problem of lack of

Patent Document 1 describes a method of measuring the distribution of the bending moment applied to a shaft during a swing, and determining the characteristics of the shaft, including the tone, from the curvature distribution obtained from the measured data and the bending stiffness distribution of the shaft. there is
In Patent Document 2, one end of a shaft is fixed to a support frame, a load is applied to a predetermined position on the other end side from a direction perpendicular to the shaft to bend the shaft, and a deflection amount detection sensor is moved along the deflection of the shaft. It is a method for measuring the amount of deflection of a shaft while the shaft is being flexed, wherein the deflection measuring method of the shaft is controlled so that the direction of the load is always constant when the shaft is deflected by applying a load.

JP-A-11-178952 Japanese Patent Application Laid-Open No. 2003-315229

However, even if the methods of Patent Documents 1 and 2 are used, there is still a problem that the deflection amount measurement values vary greatly and the reliability of quality assurance is lacking.

By adjusting the force received from the shaft so that it is always in the direction perpendicular to the axial direction of the shaft (radial direction), the inventor greatly reduced the variation in the deflection measurement value and realized good quality control. I just found out what I can do.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a deflection measuring apparatus and a deflection measuring method which are methods for efficiently and automatically measuring the deflection amounts of a large number of shafts, and which greatly reduce variations in measured values. A further object of the present invention is to provide a reliable quality control method using these measurement methods.

A deflection measuring device according to one aspect of an embodiment of the present invention includes a measuring head mechanism that has a load cell and continuously contacts the peripheral surface of the other end of a shaft to which one end is fixed, and by moving the measuring head mechanism. a load cell moving mechanism that applies a load to the shaft; a load measuring unit that measures the force applied from the shaft to the load cell; It has a displacement amount measuring unit that measures the amount of displacement, and a control device that controls the driving device and the measuring device.

A deflection measuring method according to an embodiment of the present invention includes fixing one end of a shaft, applying a load to the peripheral surface of the other end of the shaft, and measuring the amount of deflection of the shaft. It corresponds to the repulsive force acting radially on the shaft at the point where the load is applied on the shaft.

An aspect of a quality control method according to an embodiment of the present invention includes calculating variations in deflection amount data acquired by the deflection measuring method of the present invention, and performing pass/fail judgments on shaft characteristics based on the variations. .

According to the above aspect, it is possible to efficiently and automatically measure the amount of deflection of a large number of shafts, and the dispersion of measured values is greatly reduced. As a result, a highly reliable quality control method can be provided.

It is a schematic diagram showing the method of measuring the bending of the shaft in a prior art. FIG. 2 is a schematic diagram illustrating a method that is a schematic diagram of an overall deflection measuring device according to an aspect of the present invention; 1 is a block diagram showing the overall configuration of a deflection measuring device according to one aspect of the present invention; FIG. FIG. 2 is a schematic diagram illustrating a deflection measurement method according to one aspect of the present invention; FIG. 4 is a top view of a measuring head mechanism in a deflection measuring device according to one aspect of the present invention; FIG. 4 is a side view (cross-sectional view) of the measuring head mechanism in the deflection measuring device according to one aspect of the present invention; FIG. 5 is a schematic diagram showing the movement of the measuring head mechanism in the deflection measuring device according to one aspect of the present invention; FIG. 5 is a schematic diagram showing the movement of the measuring head mechanism in the deflection measuring device according to one aspect of the present invention; 4 is a flow chart showing steps of applying a load in the deflection measuring device according to one aspect of the present invention. 7B is a line graph illustrating the steps of FIG. 7A; 4 is a flow chart when rotating the angle of the shaft in the deflection measuring method according to one aspect of the present invention.

An embodiment of one aspect of the present invention will be described below with reference to the drawings. Note that the same elements are denoted by the same reference numerals, and the description may be omitted if the description is duplicated. In addition, in the drawings, each constituent element is mainly schematically shown for easy understanding.

In order to make the description clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual embodiment, but this is only an example and does not limit the interpretation of the present invention. not something to do.

In this specification, the vertical upward direction or a direction close to the vertical upward direction in the actually performed deflection measurement process is defined as "up" or "upward", and "downward" or "downward" means "upward" or "upward". means the opposite direction of Further, when a top view is used for explanation, what is above or below on the drawing and is actually in the horizontal direction may be called "above" or "below" for convenience of explanation.

In this specification, when a load is applied to the shaft and the deflection is measured, the repulsive force that tries to push back the load from the shaft is called the reaction force. Also, the direction of the reaction force at the point where the load is applied to the shaft, which is perpendicular to the tangential direction of the shaft and opposite to the direction in which the load is applied, is called the "radial direction."

<Shaft>
A shaft to be measured by a deflection measuring device according to an embodiment of the present invention will be described. In recent years, shafts used in golf clubs mainly include steel shafts made of metal and carbon shafts using carbon fiber.

The manufacturing process of the carbon shaft will not be described in detail here, but the carbon sheet is wrapped around the core metal, taped, heat-cured, and then the core metal and the taping are removed and polished. Usually at this stage, the shaft is tested for material properties, including deflection measurements, and shafts that pass the test are painted and shipped.

When inspecting a carbon shaft, the deflection measurement value may vary depending on the measurement direction due to the curl of the carbon fiber as described above. If such variation due to the bending direction occurs, the shaft may be readjusted by regrinding or the like to reduce the variation due to the bending direction, and the shaft may be sent to the next process.

<Overall Configuration of Deflection Measuring Device>
FIG. 2 is a schematic diagram showing a simplified configuration of one aspect of the deflection measuring device according to the embodiment of the present invention. Moreover, FIG. 3 is a block diagram showing the configuration of one aspect of the deflection measuring device according to the embodiment of the present invention. The deflection measuring apparatus of the present invention includes a driving device 320 for driving each member and each mechanism during transportation and deflection measurement of the shaft 202, a measuring device 340 for measuring the deflection of the shaft 202 and physical property values related thereto, and a driving device 320. It has a control device 300 that controls the movements of each mechanism and the measurement in the measuring device 340, and also performs pass/fail judgments based on the measurement results.

In FIG. 2, a storage section 200, which is a storage place for the shaft 202 before inspection, and a storage section 226, which is a temporary storage place before sending the shaft 202 after inspection to the next process, may be provided.

One aspect of the deflection measuring process in the embodiment of the present invention will be briefly described with reference to FIG. 2 .
A plurality of shafts 202 that have finished the polishing process in the manufacturing process of the shafts 202 described above are collectively temporarily stored in the storage unit 200 and wait for their turn to measure the deflection.

The shaft 202 , whose turn is to be subjected to deflection measurement, is conveyed to a fixed stage 221 on a measuring table 214 by a shaft transporter 204 in a drive device 320 .

The mode of the shaft conveying unit 322 that conveys the shafts 202 from the storage unit 200 to the fixed stage 221 is not particularly limited. It may be one that is transported.

One end (grip side) of the shaft sent to the fixed stage 221 is horizontally fixed by a fixing jig 222 . At that time, the other end side (head side) is arranged so as to overlap on the rail 217 of the uniaxial robot 212 .

With respect to the peripheral surface of the portion of the shaft 202 that overlaps with the rail 217 , the shaft 202 is applied with a load applying portion 324 that is arranged to be movable on the rail 217 of the uniaxial robot 212 in a direction substantially perpendicular to the longitudinal direction of the shaft 202 . load can be applied. That is, the measuring head mechanism 216 in the load applying section 324 is installed so as to come into contact with the peripheral surface of the shaft 202 . Single-axis robot 212 is controlled by controller 300 . The measuring head mechanism 216 is connected to the load cell moving mechanism 218 and moves on the rail 217 to move the shaft 202 in the bending direction (upward in FIG. 2).

The measuring head mechanism 216 can come into contact with the shaft 202 by keeping both of the two contact pieces (504 in FIG. 5A) in contact with the peripheral surface of the shaft 202, and has a structure in which the shaft 202 is deflected and displaced. However, this structure will be described later.

A load cell ( FIG. 5A : 510 ) is installed in the load applying section 324 . When the load applying portion 324 moves while bending the shaft 202 , the shaft 202 keeps contacting the two contact pieces of the measuring head mechanism 216 , so that the straight line connecting the two points of contact between the shaft 202 and the contact piece 504 does not move. A reaction force in the vertical direction (radial direction) will continue to be applied. The reaction force applied to the load applying section 324 is transmitted as a signal to the control device 300 together with the positional information regarding the displacement of the load cell 510 installed on the load applying section 324 on the rail 217 .

The uniaxial robot 212 may be controlled by the control device 300 or may be controlled by an operation panel 230 installed around the uniaxial robot 212 .

The shaft 202 whose deflection has been measured is transported to the storage section 226 by the shaft transport section 204-2, temporarily stored in the storage section 226, and then sent to the next step.

The driving device 320 includes a shaft conveying unit 204, such as a robot arm or a conveyor, that conveys the shaft 202 between stages in the measuring apparatus, a load applying unit 324 that applies a load to bend the shaft 202, and a shaft A shaft rotation mechanism 326 that rotates the shaft 202 about its axis may be used to measure the deflection direction variation of the 202 .

The measuring device 340 includes a load measuring section 342 that measures the reaction force received from the bent shaft 202 by displacing the measuring head mechanism 216 while being in contact with the shaft 202 by the uniaxial robot 212, and a load applying section 324 at that time. It has a displacement amount measuring unit 344 that measures the movement distance of .

The control device 300 is a device that manages and controls each part of the deflection measuring device 100. The controller 302 controls each part and mechanism in the driving device 320 and each part in the measuring device, and measures load, displacement distance, and the like. It has a storage unit 304 for storing application software and measurement data used for the measurement, and a judgment unit 306 for judging acceptance/rejection of the shaft 202 based on the measurement data. Each part will be described in detail below.

<Driving device>
As described above, the driving device 320 drives each member and each mechanism during conveyance of the shaft 202 and deflection measurement.
The shaft conveying unit 204 measures the deflection of the shaft 202 that has undergone the preceding process (polishing process), and if it is necessary to move between devices until the pass/fail judgment is completed and the shaft is sent to the next process. It is the part for moving the location of the shaft 202 .

For example, as a case of moving the location of the shaft 202, in the apparatus configuration shown in FIG. A case of moving to the storage unit 226 to pass to the process is assumed.

As the shaft transport unit 204, a multi-axis arm robot, a conveyor installed between devices, or a combination thereof can be used.
The movement of the shaft conveying section 204 is controlled by a control section 302 in the control device 300 in conjunction with the movement of other processes such as the bending measurement process.

The load applying portion 324 is a portion that applies a load to the shaft 202 and bends the shaft 202 .
The load applying unit 324 pushes and bends the shaft 202 in a predetermined direction by displacing the measuring head mechanism 216, which is a mechanism that directly contacts the shaft 202, and the measuring head mechanism 216 including the load cell (FIG. 5A: 510). A moving mechanism 218 is included.

FIG. 4 is a schematic diagram showing a deflection measuring process by a deflection measuring device according to one aspect of the embodiment of the present invention, and is a top view of the entire device viewed from above.
The shaft 202 conveyed to the measuring table by the shaft conveying section 204 is fixed at one end on the grip side by a fixing jig 222 . At that time, the shaft 202 is not bent and the other end (head side) is stationary at position A. The measuring head mechanism 216 in the load applying section 324 is brought into contact from the lower side of the shaft 202 in FIG. 4 (actually right beside the shaft 202).

From position A, when the measuring head mechanism 216 moves upward on the rail 217 of the uniaxial robot 212 (actually horizontally and vertically with respect to the longitudinal direction of the shaft 202) and reaches point B, the shaft 202 is Since one end on the grip side is fixed, it bends by a certain amount. The parallel moving distance D1 of the rail 217 in that case is used as a reference for evaluating the deflection amount of the shaft 202 .

When the measuring head mechanism 216 is displaced to point B, the measuring head mechanism 216 receives a reaction force N from the contact portion with the shaft 202 . The measuring head mechanism 216 of the present invention has a structure that can always receive this reaction force N from the radial direction at the contact portion with the shaft 202 .

The measuring head mechanism 216 will now be described in detail.
FIG. 5A is a top view of one aspect of the measurement head mechanism 216 in an embodiment of the present invention. FIG. 5B is a partially sectioned side view taken along line II′ in FIG. 5A. The measuring head mechanism 216 is always in two-point contact with the shaft 202 through a pair of contact pieces 504 . The contact piece 504 is rotatably installed around the rotation axis 514 shown in FIG. 5A.

The contact piece 504 is provided with a recess 518 at a point where the shaft contacts the contact piece 202 , and the recess 518 guides the shaft 202 toward the center (axial direction) of the contact piece 504 .
The contact piece 504 is fixed on a mounting member 506 a provided on the connecting block 506 .

The connection block 506 is connected to the load cell 510 on the side opposite to the position of the mounting member 506a. When an external force is applied to the contact piece 504, it is transmitted as it is to the connecting block 506. At that time, the connecting block 506 is pressed against the load cell 510, so that the load cell 510 transmits information on the external force as an electric signal through the wiring 512. It is transmitted to the control device 300 .

The connecting block 506 is installed on the measuring head base 502 via linear guides 508 (508-1 and 508-2). The linear guide 508 is a mechanism that adjusts the direction of the load applied to the measuring head mechanism 216 through the contact piece 504, and can always apply force to the load cell 510 in a fixed direction.
In measuring the deflection of the shaft 202, the direction of the reaction force N received from the shaft 202 is actually three-dimensional, and the direction with respect to the load cell 510 cannot always be said to be constant. Therefore, the linear guide 508 is used to always correct the direction of the three-dimensionally fluctuating force to a constant direction, thereby playing a role in suppressing variations in measured values. The content of the linear guide 508 is not limited as long as the reaction force N is vertically transmitted to the load cell. For example, a linear shaft or the like may be used.

A back plate 502a for fixing the load cell 510 may be provided on the measuring head base 502, but the manner of fixing the load cell 510 is not limited to this.

The measuring head base 502 is connected to the fixed base 220 via a rotating shaft 514 and is rotatable around the rotating shaft 514 . Since the measuring head base 502 is rotatable, the contact piece 504 fixed on the measuring head base 502 can follow the displacement of the shaft 202, and even if the direction of the reaction force N changes, the direction of the load cell is fixed. power can be transmitted from

The rotating shaft 514 may be fixed either on the measuring head base 502 side or on the fixed base 220 side. In FIG. 5B , the rotating shaft 514 is fixed to the measuring head base 502 , the fixed base 220 is provided with a bearing 520 , and is rotatable at the joint with the fixed base 220 .
Note that the center line of the rotating shaft 514 (broken line in FIG. 5B) may be adjusted so as to pass through the center of the cross section of the shaft 202 . By adjusting the positions of the rotating shaft 514 and the shaft 202 to such a relationship, it is possible to keep the contact piece 504 in contact with the shaft 202 .

6A and 6B show how the measurement head mechanism 216 follows the displacement of the shaft 202. FIG.
6A shows a state in which there is no reaction force N from the shaft 202, but when the position of the shaft 202 is displaced as shown in FIG. Both of the two contact pieces 504 can be kept in contact with the shaft 202 by following. At that time, the position of the fixed base 220 does not change.

By keeping the reaction force from the shaft 202 in the direction (radial direction) perpendicular to the straight line connecting the contact points (two contact pieces 504) of the measuring head mechanism 216 and the shaft 202, Variation in the received reaction force and the measured deflection of the shaft 202 is reduced, and highly reliable quality control can be achieved.

Although there are two contact pieces 504 in FIG. 5A, there may be three or more contact pieces 504, all of which are in contact with the outer peripheral surface of the shaft 202. FIG. When three or more contact pieces 504 are in contact with the peripheral surface of the shaft 202, the direction (radius direction) can be adjusted.

Returning to FIG. 4, the load cell moving mechanism 218 will be described. The load cell moving mechanism 218 is a mechanism that pushes the shaft 202 in a predetermined direction by displacing the part on which the load cell 510 is mounted (measurement head mechanism 216 in the case of FIG. 4) to apply a load and bend it.

In FIG. 4, the load cell moving mechanism 218 becomes a uniaxial robot 212, and by moving the measuring head mechanism 216 on the rail 217 of the uniaxial robot 212 while keeping it in contact with the shaft 202, the shaft 202 can be bent.

The drive of the load cell moving mechanism 218 may be controlled by the control device 300, but for the convenience of the measurement operation, an operation panel (230 in FIG. 2) may be provided around the deflection measuring device for control.
The load cell moving mechanism 218 is not limited to a uniaxial robot as long as it can control the position of the portion on which the load cell 510 is mounted.

The shaft rotation mechanism 326 is used when it is desired to measure a plurality of patterns in which the deflection measurement of the shaft 202 is changed in the circumferential direction of the shaft 202 . As described above, the carbon shaft may have curl due to the shaft 202, and good quality control of the shaft 202 can be performed by comprehensively judging the results of bending in a plurality of radial directions and measuring. can.

The shaft rotation mechanism 326 is not particularly limited as long as it can rotate the shaft 202 around the axis by a predetermined angle. good.

<Measuring device>
The measurement device 340 is a portion that measures the amount of deflection of the shaft 202 and generates data for evaluation. The measuring device 340 includes a load measuring unit 342 that measures the load applied to the load cell 510, a portion on which the load cell 510 is mounted, and the displacement (the moving distance D1 in the case of FIG. 4) of (the measuring head mechanism 216 in the case of FIG. 4) ) is provided.

The load measuring unit 342 is not particularly limited as long as it can measure the load applied to the load cell 510 . In the case of FIG. 5A, the load cell 510 itself is the same as the load measuring unit 342. For example, by installing an elastic body with a known elastic constant and measuring the displacement when a reaction force N is applied, the load cell 510 It may be a measured value of the load applied to

The displacement amount measuring unit 344 is not particularly limited as long as it can measure the displacement of the portion on which the load cell 510 is mounted. In FIG. 4, a displacement measuring device (not shown) mounted on the uniaxial robot corresponds to the displacement measuring unit 344, but the displacement measuring unit 344 may not be integrated with the uniaxial robot 212. For example, An image of the deflection measuring device may be captured from above, and the displacement of the portion where the load cell 510 is mounted may be calculated from the captured image.

The mode of displacement measured by the displacement amount measuring unit 344 may be appropriately determined based on the evaluation criteria based on the measurement results, and is not limited. For example, in FIG. 4, the movement distance D1 in the direction parallel to the rail of the uniaxial robot 212 is used, but the displacement angle C in FIG. 4 may be used.

<Control device>
Returning to FIG. 3, the control device 300 will be described. The control device 300 includes a control unit 302 that controls the operation of the driving device 320 and the measuring device 340, a storage unit 304 that stores programs and data used in the operation of each unit, and a shaft 202 quality evaluation based on the measurement results. It is composed of a determination unit 306 that performs.

The control unit 302, for example, controls the operation of a 6-axis robot in the shaft conveying unit 204 of the drive device 320, the operation control of a 1-axis robot serving as the load cell moving mechanism 218, the rotation control of the shaft rotation mechanism 326, or the load measurement unit 342. It is possible to analyze the measured load data and the displacement data of the portion on which the load cell 510 is mounted, which is measured by the displacement measuring unit 344 .

The storage unit 304 stores programs necessary for driving the control unit 302 or each unit. Furthermore, the data acquired by each unit, for example, the data related to the measurement data transmitted from the displacement measurement unit 344, etc. are stored.

The control unit 302 and storage unit 304 may be a combination of a commercially available computer and memory, and preferably can exchange data bidirectionally with the driving device 320 and the measuring device 340 .

<Bending measurement method>
Next, a method for measuring the shaft 202 according to one aspect of the embodiment of the present invention will be described.
In FIG. 4, the shaft 202 is fixed by the fixing jig 222 on the fixed stage 221 and placed at the position A, as described above.

In the measurement, the measurer sets the characteristic items of the shaft 202 to be measured in advance. For example, an example will be described in which the displacement D1 on the rail of the uniaxial robot 212 is measured when a predetermined load m is applied.

In order to calculate an accurate measurement value, the process of applying the target load is preferably performed in several stages so that the shaft 202, which is an elastic body, does not vibrate.
FIG. 7A is a flow chart of load application during deflection measurement according to one aspect of an aspect of an embodiment of the present invention. Moreover, FIG. 7B is a diagram showing the flowchart in a graph of time and load.

The measurement head mechanism 216 starts in contact with the shaft 202 (step S101), and is displaced by the load cell moving mechanism 218 so that the load increases to a load a that is about 30% to 50% of the target load m (step S102). . After that, in order to suppress the vibration of the shaft 202, the load is temporarily lowered to b at a low speed to suppress the vibration of the shaft 202 (step S103). After that, the load is displaced at high speed until c, which is about 80 to 90% of the target load D (step S104), and then the target load m is reached at low speed. A distance d1 when reaching the target load m is measured, and data is transmitted to the control device 300 as a deflection measurement of the shaft 202, and the data is stored in the storage section 304 of the control device 300. FIG.

Since the shaft 202 is an elastic body, unnecessary vibrations of the shaft 202 can be suppressed by such a load application process consisting of several steps, and measurement data with little variation can be obtained.

Such a stepwise load application process is effective when measuring the shaft 202 having large bending such as a carbon shaft, but is not limited to this. Depending on the material and shape of the shaft 202 to be measured, it can be appropriately set by the measuring person.

FIG. 8 is a flow chart illustrating the steps involved in measuring the load applied to shaft 202 at multiple radial directions of shaft 202 .
In FIG. 8, the measurement is performed four times by 45 degrees (steps S201 to S204), and it is possible to determine whether the quality of the shaft 202 is acceptable or not based on the results of each measurement.

As for the direction of load application to the shaft 202, it is preferable to apply the load from at least two angles to one shaft 202, and it is more preferable to apply the load from four or more angles.

<Quality control>
A pass/fail decision based on the deflection measurement value associated with the quality control of the shaft 202 will be described.
In one aspect of the embodiment of the present invention, an evaluator of data obtained by bending measurement can arbitrarily set evaluation items and judgment criteria associated with quality control.

As the evaluation items, for example, after determining the number of target load settings, the load application process, and the load application direction (angle), the positional displacement of the deflection measured in each pattern (d1 in FIG. A threshold value can be set and managed for c1) in FIG.

According to one aspect of the embodiment of the present invention, the evaluator can use variation in measured values as an evaluation item. For example, the percentage of patterns that deviate from the threshold may be used, or the difference between the maximum and minimum measured values or the standard deviation (σ) may be used as an evaluation item even if the pattern does not deviate from the threshold.

In one aspect of the embodiment of the present invention, it is preferable to perform multiple measurements under the same conditions. Further, in a plurality of measurements performed under the same conditions, the fixing jig 222 may be removed each time, and the measurement may be performed again after it is gripped back.

As a result of the evaluation based on the measurement results, products that are rejected may be discarded, or by feeding back the measurement results, the shaft 202 may be partially polished and then evaluated again. you can go

Based on one embodiment described in this specification, those skilled in the art added, deleted, or changed the design of components as appropriate, or added, omitted, or changed the conditions of steps, As long as it has the gist of the present invention, it is included in the scope of the present invention.

In addition, other effects that are different from the effects brought about by the aspect of one embodiment described herein are obvious from the description of this specification or can be easily predicted by those skilled in the art. It is naturally understood that the objects are brought about by the present invention.

<Modification>
In the deflection measuring device which is one aspect of the embodiment of the present invention described above, load application is limited to one direction using a uniaxial robot. However, the direction in which the load is applied is not limited to one direction, and may be any direction.
In this case, the step of rotating the shaft 202 about its axis to change the direction of the load in the radial direction becomes unnecessary, and the deflection measurement step can be simplified.

200: storage unit, 202: shaft, 204: shaft transfer unit, 212: uniaxial robot, 216: measuring head mechanism, 217: rail, 220: fixed base, 222: fixed jig, 218: load cell movement mechanism, 300: control Device, 302; control unit, 304: storage unit, 306: determination unit, 326: shaft rotation mechanism, 340: measurement device, 342: load measurement unit, 344: displacement amount measurement unit, 502: measurement head base: 504: contact Top, 506: Connection block, 508: Linear guide, 510: Load cell, 512: Wiring

Claims (6)

a measuring head mechanism having a load cell and continuously contacting the peripheral surface of the other end of a shaft fixed at one end;
a load cell moving mechanism that applies a load to the shaft by moving the measuring head mechanism;
a driving device having a load bearing portion having
a load measuring unit that measures the force applied to the load cell from the shaft;
a displacement amount measuring unit that measures the amount of displacement of the measuring head mechanism that is moved by the load cell moving mechanism;
a measuring device having
a control device that controls the driving device and the measuring device;
A deflection measuring device. The measuring head mechanism continuously contacts the shaft at two or more contact points,
2. The deflection measuring device according to claim 1, wherein the force received from said shaft has a direction perpendicular to a straight line connecting two points selected from said two or more contact points. the measuring head mechanism continuously contacts the shaft at two points;
2. The deflection measuring device according to claim 1, wherein the force received from said shaft has a direction perpendicular to a straight line connecting said two points. 4. The deflection measuring device according to claim 2, wherein said measuring head mechanism has an angle adjustment mechanism for following deflection of the shaft and contacting it. Fix one end of the shaft,
A deflection measuring method for applying a load to the other end side peripheral surface of the shaft and measuring the deflection amount of the shaft,
A method of measuring deflection, wherein the load corresponds to a repulsive force acting radially of the shaft at the point on the shaft where the load is applied. 6. A quality control method, comprising: calculating variations in deflection amount data acquired by the deflection measuring method according to claim 5;

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