JP2003139527A - Distortion measuring method and device for screw part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distortion measuring device for screw parts with high measurement accuracy for distortion of the screw parts and favorable measurement efficiency. SOLUTION: The distortion measuring device for screw parts is characterized in that a moving distance measuring means is composed of a measuring device 7 having a probe 7 engaging and moving from a tip to a thread 2a of the screw part 2, a laser device 8 recognizing a moving distance T of the measuring device and a counter device 9 connected with the laser device 8, a rotation angle measuring means is composed of a holder 5 rotatably holding a container 1 and an encoder device 12 interlocked with the holder 5 and recognizing a rotation angle θ of the screw part 2, and moving distance information A and rotation angle information B are respectively transmitted to a personal computer from the counter device 9 and the encoder device 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for measuring the distortion of a screw portion, which has high accuracy in measuring the distortion of the screw portion and has improved measurement efficiency.

[0002]

2. Description of the Related Art Conventionally, the inclination angle of the thread formed on the thread is constant as a factor for judging whether the thread formed on the thread of the container has an appropriate shape. Attempts have been made to measure screw thread distortion. Generally, when the inclination of the screw thread is large, when moving the cap, the moving distance of the cap per one rotation of the cap (the rising distance of the cap) is large, and when the inclination of the screw thread is small, the cap movement is large. It is known that the moving distance of the cap with respect to the rotation (the rising distance of the cap) becomes small. When the threads have the same inclination angle and are formed parallel to each other, smooth opening is possible, and when the inclination angle is not constant, the opening is firm and the rotation torque is large. There's a problem. Conventionally, a stylus shape measuring instrument has been used as a method for measuring the thread of such a threaded portion.The thread is measured with this measuring instrument, and it is artificially graphed to draw a measurement line and a reference line. I was measuring the distortion of the screw thread.

[0003]

However, such a conventional measuring method has the following drawbacks. (1) Since the shapes of the threads are not constant, it is difficult to accurately determine the vertices of all the threads. That is, in the measurement of the screw thread by the shape measuring instrument, there is a disadvantage in that the reading differs depending on the individual because the reading depends on the individual visual measurement when determining the apex. (2) The graph was artificially drawn, a reference line was drawn on the graph, and the difference (distortion of the screw thread) from the measurement line was visually read by a ruler to give a numerical value, but it took a lot of work time. There is.

The present invention has been made by paying attention to such a conventional problem, and has a high accuracy of measuring the strain of the screw portion,
Moreover, it is an object of the present invention to provide a method and apparatus for measuring strain of a screw portion, which improves the measurement efficiency.

[0005]

In order to solve this problem, the means corresponding to the invention of claim 1 is, from the tip of the screw part to a specific screw thread, in accordance with the rotation of the container and the screw part. The moving distance measuring means recognizes the moving distance of the tracing stylus that moves in engagement with the screw thread, transmits the moving distance information to the personal computer through the moving distance measuring means, and measures the rotation angle of the container and the screw portion. Recognize by, and send the rotation angle measurement information to the personal computer through the rotation angle measurement means,
A method for measuring strain of a screw portion, characterized in that moving distance information and rotation angle information are displayed as two-dimensional coordinate data and calculated values on a personal computer screen.

According to a second aspect of the present invention, the moving distance measuring means comprises a measuring device having a tracing stylus, a laser device and a counter device, and the rotation angle measuring means comprises an encoder device. Is a method of measuring strain of a screw portion.

According to a third aspect of the present invention, there is provided a moving distance measuring means for measuring a moving distance from a tip portion of a screw portion to a specific screw thread, and a specific screw thread from a starting end portion of a complete screw portion. Up to the rotation angle measuring means for measuring the rotation angle of the screw part, the movement distance measuring means and the rotation angle measuring means respectively transmit the movement distance information and the rotation angle information to the personal computer, and on the personal computer screen It is a distortion measuring device for a screw portion, which displays moving distance information and rotation angle information as two-dimensional coordinate data and calculated values.

According to a fourth aspect of the present invention, the moving distance measuring means has a measuring device having a tracing stylus which moves by engaging a screw thread from the tip of the threaded portion, and the moving distance of the measuring device. It consists of a laser device for recognition and a counter device connected to the laser device.
It consists of a holder that holds the container rotatably and an encoder device that works with the holder and recognizes the rotation angle of the screw part.The counter device and the encoder device respectively send the moving distance information and the rotation angle information to the personal computer. It is a device for measuring strain in a screw portion, which is characterized in that it is transmitted.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the drawings. 1 to 5 are drawings showing a strain measuring device for a screw portion according to the present invention. The container 1 to be measured is rotatably held by a holder 5. Further, on the threaded portion 2 of the container 1, the tracing stylus 7a moves along the thread 2a as the container 1 rotates. As shown in FIG. 4, the tracing stylus 7a is rotatably supported by the measuring instrument 7 moving on the slide rail 7c. As shown in FIG. 3, a forked portion 7b is formed at the tip of the tracing stylus 7a, and the forked portion 7b engages and moves while gripping the screw thread 2a.

The moving distance T (distance in the axial direction from the tip of the mouth) of the probe 7a is measured by the laser measuring device 8,
The measured value is transmitted to the personal computer as moving distance information (A) through the counter device 9. On the other hand, the rotation angle θ of the container 1 and the screw portion 2 is transmitted to the encoder device 12 through the belt 11 through the sprocket 10 that rotates in conjunction with the holder 5, as shown in FIGS. 1 and 2.
The rotation angle measurement information (B) is transmitted to the personal computer through the encoder device 12.

Then, based on the transmitted movement distance information and rotation angle measurement information, a graph showing the relationship between the movement distance T and the rotation angle θ is created on the screen using known software. Table 1 is shown below.

[Table 1] In Table 1, the vertical axis indicates the moving distance T and the horizontal axis indicates the rotation angle θ. The moving distance from the measurement starting point a to the position b where the container 1 and the screw portion 2 are rotated by θ1 is T1. , Θ
The moving distance to the portion C rotated two times is T2, and the moving distance to the portion d rotated θ3 is T3. Then, a measurement line J connecting these a, b, c and d is displayed on the screen. A reference line K is displayed alongside the measurement line J. The starting point a of the measurement is the starting point of the complete thread part excluding the incomplete thread part, and as shown in FIG. 4, the part where the tracing stylus 7a has passed through the incomplete thread part (of the part rotated by θ0 The measurement starts from the starting point a).

The reference line K is determined as shown in Table 2. Table 2 is shown below.

[Table 2] In Table 2, when the area formed between the reference line K and the measurement line J is represented by S1, S2, and S3, it is formed below the reference line K in the reference line K and the measurement line J. The reference line K is automatically calculated and displayed in the moving distance from a to e so that S1 = S2 + S3 is satisfied between the area S1 and the areas S2 and S3 formed on the upper side. When the movement distance T and the rotation angle θ indicate the movement distance and the rotation angle along the reference line K, the threads 2a of the screw portion 2 are all formed in parallel, which enables a smooth opening. . However, as shown in Table 2, when there is a difference H between the movement distance X at the rotation angle θx and the reference line K (the inclination angle of the screw thread is slightly smaller at the X portion), or the movement distance at the rotation angle θy. If there is a difference I between Y and the reference line K (the inclination angle of the screw thread is slightly larger at the Y portion), the inclination angle of the screw thread 2a is not constant, and the inclination angle of the screw thread at this portion is disturbed. It shows the state. The present invention can automatically display the values of H and I by calculation. For example, the screw thread 2a in the area Z in Table 1
, The measurement line J moves up and down with respect to the reference line K which is a straight line. Therefore, when the cap is opened, the cap is in a state of opening while absorbing the pitch error of the screw, which shows that the opening torque in the area Z is increasing. In some cases, it may not be possible to open the cap.

Next, the strain measuring device for the screw portion according to the present invention will be described. The screw strain distortion measuring device according to the present invention comprises a moving distance means for measuring a moving distance from the tip of the screw portion to a specific screw thread, and a rotation measuring means for measuring a rotation angle of the container and the screw portion. , An ordinary personal computer (not shown) is connected and displayed as two-dimensional coordinate data and calculated values on the screen. In the embodiment of the present invention, the measuring device 7 having the tracing stylus 7a as the moving distance means.
Is provided, and both the measuring instrument 7 and the measuring element 7a are formed so as to be movable in the axial direction. Specifically, the probe 7
The bifurcated portion 7b at the tip of a transfers the moving distance T (distance parallel to the axis) moved by engaging the screw thread 2a of the screw portion 2 from the measuring device 7 to the laser measuring device 8 via laser light. To do. Then, the moving distance information (A) is transmitted from the laser measuring device 8 to the counter device 9.

On the other hand, the container 1 is rotatably held by the holder 5 so that the tracing stylus 7a moves along the thread 2a. Bearing means is incorporated in the holder 5, and the lever 6a of the handle 6 is manually rotated in a fixed direction to rotate the container 1 and the screw portion 2. Then, the rotation angle θ of the container 1 and the screw portion 2 is set so that the rotation of the holder 5 is the sprocket 10
Through the belt 11 to the encoder device 12. The laser device 8 is a device that measures the moving distance T of the probe 7a, and employs a non-contact laser type. The counter device 9 is a device that counts and controls the moving distance information (A) from the laser device 8 and transmits the moving distance information (A) to the personal computer. The encoder device 12 is a device that measures the rotation angle θ and transmits the rotation angle information (B) to the personal computer. As another embodiment, it is also possible to measure with a dial gauge type indicator 13 as shown in FIG. 5 instead of the laser device. Further, the counter device 9 may be replaced by a known data transfer device, and the encoder device 12 may be replaced by a known rotation angle measuring device such as a resolver. The counter device 9 and the encoder device 12 are each connected to a personal computer.

[0015]

As described above, according to the present invention, there is no measurement error due to individual differences as in the past, and since it is displayed as a graph and numerical values on the screen of a personal computer, it is possible to perform artificial measurement. It is not necessary and has the effect of high measurement accuracy of the strain of the screw part. Also, about 60 per container
The measurement time per minute is about 5 minutes per container, and the measurement efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing a strain measuring device for a screw portion according to the present invention.

FIG. 2 is a front sectional view showing a strain measuring device for a screw portion according to the present invention.

FIG. 3 is an enlarged cross-sectional view showing a moving state and a moving distance of a tracing stylus for measuring a moving distance T in the strain measuring device for a screw portion according to the present invention.

FIG. 4 is a side view showing a state in which a rotation angle θ is being measured in the strain measuring device for a screw portion according to the present invention.

FIG. 5 is a front view showing an indicator in the strain measuring device for a screw portion according to the present invention.

[Explanation of symbols]

1 container 2 screw part 2a screw thread 5 holder 7 Measuring device 7a Stylus 8 laser equipment 9 counter devices 12 Encoder device (A) Travel distance information (B) Rotation angle information T moving distance θ rotation angle

Claims (4)

[Claims] 1. A moving distance measuring unit recognizes a moving distance of a tracing stylus that moves by engaging a screw thread from a tip portion of the screw section to a specific screw thread as the container and the screw section rotate, The moving distance information is transmitted to the personal computer through the moving distance measuring means, the rotation angle measuring means recognizes the rotation angle of the container and the screw portion, and the rotation angle measuring information is transmitted to the personal computer through the rotation angle measuring means. A method for measuring distortion of a screw portion, characterized in that the moving distance information and the rotation angle information are displayed on a screen as two-dimensional coordinate data and calculated values. 2. The moving distance measuring means comprises a measuring device having a tracing stylus, a laser device and a counter device, and the rotation angle measuring means comprises an encoder device. For measuring the strain of the threaded part of the. 3. A moving distance measuring means for measuring a moving distance from a tip portion of the screw portion to a specific screw thread, and a rotation angle of the screw portion from a starting end portion of the complete screw portion to the specific screw thread. The moving distance information and the rotating angle information are transmitted to the personal computer from the moving distance measuring means and the rotating angle measuring means, respectively, and the moving distance information and the rotating angle information are displayed on the personal computer screen. Is displayed as two-dimensional coordinate data and calculated values. 4. A measuring device, wherein the moving distance measuring means has a tracing stylus that moves by engaging with a screw thread from a tip end of a screw part, a laser device for recognizing a moving distance of the measuring device, and the laser. A counter device connected to the device, wherein the rotation angle measuring means is composed of a holder that rotatably holds the container, and an encoder device that interlocks with the holder and recognizes the rotation angle of the screw part, 4. The screw portion strain measuring device according to claim 3, wherein the moving distance information and the rotation angle information are transmitted to the personal computer from the counter device and the encoder device, respectively.