JP2019020238A - Non-contact external shape measuring system of red-hot press molding material by means edge measurement - Google Patents

Abstract

To provide a non-contact external shape measuring system capable of precisely measuring the state of a red-hot press molding material to be measured under pressure molding by continuously measuring the edges as the contour of the heated red-hot press molding material under pressure molding emitting infrared ray without contact with the target.SOLUTION: The non-contact external shape measuring system has an imaging unit 1 equipped with an infrared transmission filter 1a for continuously capturing an edge b of a measurement object a which emits infrared ray during pressure molding, the imaging unit 1 being movably disposed at one side of a pressure forming unit and configured to move in accordance with a movement direction of an edge b. The imaging unit 1 is also equipped with a controller unit which is configured to movably control imaging unit to detect an edge candidate by designating an elongated edge detection area 41 in an extending direction of the object to be measured under pressure molding on the basis of information of an image from the imaging unit 1. The imaging unit 1 is also configured to recognize the edge candidate as the edge b of the measured object in which the gray scale value of one of the discrimination areas where the white ratio is 50% or more and the other less than a predetermined value and the black ratio is 70% at the time of shooting.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a technique for measuring the pressure forming state of a measurement object that is a heated metal that emits infrared rays, for example, a red hot pressing material such as a forged material or a rolled material, and in particular, red hot pressing of a heated metal that emits infrared rays. Red-hot pressurization by edge measurement that measures the state during press-molding of a measurement object, which is a red hot press molding material, by continuously measuring the edge that is the outer shape during press molding of the material without contact The present invention relates to a non-contact type outer shape measuring apparatus for a molding material.

It is important to accurately measure the ring dimensions in order to perform red hot pressing materials such as high-temperature forging materials and rolled materials having a temperature of 650 ° C. or higher, for example, ring rolling with high accuracy and high speed. The conventional measuring method is a contact type in which the measuring instrument is directly pressed against a ring for rolling.
When measured with this contact type, the measurement object, which is a red hot pressing material such as forging or rolling material, is pressurized and spreads outward, but the contact type roller with a measuring cylinder that measures this in the direction of material expansion Therefore, the contact surface of the red hot press molding material is scratched by contact with this roller, and this often causes the surface of the molded product to remain as a scratch and not be used as a product. Has occurred. Alternatively, the measuring instrument itself is often damaged by being exposed to excessive pressure from the material or high temperature and heat. Also, regular maintenance due to mechanical wear is necessary, and the replacement cost of the measuring instrument is also high.
In recent years, there is a shift from contact-type mechanical measurement using a measurement cylinder to a non-contact measurement method such as a laser sensor.

JP 2001-280946 A

However, the non-contact type such as a laser sensor has several drawbacks.
For example, the measurement accuracy depends on the distance between a laser sensor and a measurement object that is a red hot pressing material such as a forged material or a rolled material.
Further, the laser sensor has a drawback that the measurement is a point measurement, and therefore, at the same time, it is impossible to measure a plurality of locations of the measurement object which is a red hot pressing material. In order to measure a plurality of locations at the same time, the same number of laser sensors is required, and the number of equipment for these sensors increases, resulting in a very high cost.
Furthermore, it is difficult to secure a space where a plurality of laser sensors can be installed around a pressure molding apparatus or the like.
In addition to these, in order to prevent the pressure molding apparatus from being overheated by the measurement object that is a heated red pressure molding material, the pressure molding apparatus is cooled with cooling water. Steam is generated by the cooling water. When the laser sensor is used, the water and steam are obstructed and measurement is impossible. Therefore, in order to avoid this, a separate dedicated device for scattering the steam is required.
As a proposal for solving the above-mentioned drawbacks caused by the laser sensor, there is a measurement with a camera. However, the camera has another drawback as follows.
When photographing with a camera, there is a case where the background of the measurement object that is a red hot pressing material is entered, and the outer shape of the measurement object cannot be clearly imaged.
In order to avoid this, it is necessary to attach a curtain etc. behind the measurement object, which is a red hot press molding material, so that the background is not reflected, but it is very troublesome to attach the curtain etc. in the factory. Also, it seems difficult to secure the installation space.
Even if a curtain is attached to prevent the background from entering, the following drawbacks cannot be prevented.
(1) The effect of sunlight from the windows and gates of the building.
(2) Influence of surface gloss from an instrument that clamps the measurement object from above and below.
(3) Influence of gloss of sliding parts such as rolling tables.
(4) Influence of the scale of the surface of the measurement object (that is, the oxide coating formed by cooling on the surface).
In other words, measurement using a camera is difficult unless these drawbacks are eliminated.

  In view of the above-mentioned problems, the present invention has been devised to solve the problems. The object of the present invention is during the pressure molding of a hot metal red-hot pressure molding material that emits infrared rays. The non-contact of the red pressure molding material by the edge measurement that can measure the state during the pressure molding of the measurement object that is the red heat pressure molding material accurately by continuously measuring the edge that becomes the outer shape. The object is to provide a contact-type outer shape measuring apparatus.

  In order to achieve the above-described problems, the invention of claim 1 is a measurement object that is a hot metal red-hot pressure molding material that emits infrared rays, and continues an edge that is an outer shape of the measurement object during pressure molding. The side of the pressure molding apparatus that presses and molds the measurement object with a photographing machine equipped with an infrared transmission filter that moves in accordance with the moving direction of the edge that is photographed and extends and moves in a predetermined direction by pressure molding The photographing machine is for photographing the edge of the measurement object through an infrared transmission filter, and is elongated in the extending direction of the measurement object at the time of pressure molding based on photographing information from the photographing machine. An edge detection area is specified to detect an edge candidate, and the gray scale value at the time of shooting in one of the discrimination areas across the edge candidate detected in the edge detection area is regarded as white, and this white ratio If the gray scale value at the time of shooting in the other discrimination area is 50% or more and the gray ratio is less than a predetermined value as black, the black ratio is 70% or more, and the edge candidate is recognized as the edge of the measurement object, and the photographing machine is used. A control device for controlling the movement is provided.

  Further, according to a second aspect of the present invention, as a preferable aspect of the first aspect, the gray scale value at the time of photographing in one of the discrimination areas is regarded as white when the edge candidate detected in the edge detection area is sandwiched. When the white ratio is 70% or more and the gray scale value at the time of shooting in the other discrimination area is less than a predetermined value, the black ratio is 80% or more, and the edge candidate is recognized as the edge of the measurement object.

  Further, in claim 3, as a preferred aspect of claim 1 or claim, a plurality of edge detection areas are designated in the height direction of the measurement object.

  According to a fourth aspect of the present invention, as a preferred aspect of the first aspect, in the photographing apparatus for continuously photographing the edge of the measurement object, the area reference line overlaps the edge of the movement of the edge of the measurement object that moves in a predetermined direction by pressurization. Thus, the movement of the edge of the measurement object is followed.

According to the non-contact type outer shape measuring apparatus of the red hot press molding material by the edge measurement according to the first aspect of the invention, the following extremely new and beneficial effects are obtained.
A plurality of edges at the edge of a measurement object that is a red hot pressing material such as a forged material or a rolled material can be simultaneously measured in a non-contact state with a single measuring device. For this reason, it does not damage the outer shape of the measurement object, and does not create a defective product that remains as a scratch on the surface of the molded product and cannot be used as a product. Further, a plurality of measuring devices are not required, and the number of these measuring devices is not increased and the cost is not very high. In addition, since mechanical wear does not occur, regular maintenance is not necessary, and there is no cost for replacing the measuring instrument.
In order to prevent the pressure forming device from being heated excessively by the measurement object that is a red hot pressure forming material such as a heated forging material or rolled material at the time of photographing with a photographing machine, the pressure forming device with cooling water. When water is cooled, steam is generated by the cooling water, but because of photographing through the infrared transmission filter, those emitting infrared rays such as high-temperature metals of 650 ° C. or higher are photographed in white, and conventional laser sensors As described above, since the vapor does not hinder the photographing, a device for scattering the vapor can be omitted. Thereby, it is not necessary to secure a space for installing the scattering device, and the cost of the device can be omitted.
By using the infrared transmission filter, the filter can be used without being influenced by the background of a measurement object that is a red hot pressing material such as a forged material or a rolled material. For this reason, it is not necessary to attach a curtain or the like behind the measurement object so that the background is not reflected, and it is also possible to eliminate the need for a space for attaching the curtain or the like.
Also, when shooting with a camera, since it is shooting through an infrared transmission filter, those that do not emit infrared light will be black shooting, which will be a disturbance factor of shooting, such as the influence of sunlight from the building window, gate, The influence of the surface gloss of the instrument that clamps the measurement object from above and below, the influence of the gloss of the sliding part such as a rolling table, and the influence of the scale attached to the ring surface of the measurement object all do not emit infrared rays 650 ° C or less Therefore, these effects can be prevented.
Since the amount of displacement of the outer shape during pressure molding of the measurement object, which is a red hot pressing material, coincides with the distance traveled by the photographing machine, the positional accuracy in the moving direction of the photographing machine directly becomes the measurement precision of the measurement object.
In the second aspect, in addition to the effect of the first aspect, the edge of the measurement object can be more reliably measured.
According to the third aspect, in addition to the effect of the first aspect, more edge points of the measurement object can be simultaneously measured, and the measurement object having a complicated shape can be measured more precisely.
In the fourth aspect, in addition to the effect of the first aspect, it is possible to accurately measure the outer shape of the measurement object by moving the movement of the photographing machine more precisely in accordance with the movement of the edge of the measurement object. it can.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic whole block diagram of the non-contact-type external shape measuring apparatus of the red hot press molding material by the edge measurement which shows the form for implementing this invention. It is a top view of the ring mill which shows the form for implementing this invention. (A) is a top view of the imaging | photography machine moving apparatus which shows the form for implementing this invention, (B) is a side view of the figure (A), (C) is a front view of the figure (A). It is a monitor figure of the edge detection area of the measurement object which shows the form for implementing this invention. It is a system block diagram of the non-contact-type external shape measurement apparatus of the red hot press molding material by the edge measurement which shows the form for implementing this invention. It is a flowchart of the non-contact-type external shape measuring apparatus of the red hot press molding material by the edge measurement which shows the form for implementing this invention. It is a flowchart of edge recognition which shows the form for implementing this invention.

Hereinafter, the present invention will be described more specifically based on embodiments for carrying out the invention described in the drawings.
In the figure, a non-contact type external shape measuring device for a red hot press molding material by edge measurement is applied to a measuring object a which is a red metal press forming material such as a heated metal such as a forged material or a rolled material, for example, emitting infrared rays at 650 ° C. Measures the pressure forming state, in particular, continuously measures without contacting the edge b which is the outer shape of the measurement object a during pressure molding, and pressurizes the measurement object a which is a red hot pressing molding material. It accurately measures the state during molding.

  The non-contact type outer shape measuring device for red hot press-molded material by edge measurement has a photographing machine 1 for continuously photographing the edge b which is the outer shape at the time of pressure molding of the measurement object a. The photographing machine 1 is movably disposed on the side of, for example, a ring mill 101 of a pressure molding apparatus that press-molds a measurement object a that is a red hot pressure molding material. For example, a 21 million pixel imaging CCD camera is used for the photographing machine 1. Further, the photographing machine 1 has a high speed performance of photographing one image in 0.05 seconds, for example.

  A photographing machine moving device 2 for moving the photographing machine 1 is provided on the side of the ring mill 101. The photographing machine moving device 2 includes, for example, a traveling path 21, a linear guide 22, a cable guide 23, and the like.

  A travel plate 21a is attached to the upper part of the travel path 21 on which the photographing machine 1 moves. The traveling plate 21a is attached in parallel with the moving direction of the edge b, which is the outer shape of the measurement object during pressure molding. The lower portion of the travel plate 21a is supported by, for example, three support legs 21b.

  On the traveling plate 21 a of the traveling path 21, a linear guide 22 that moves, for example, linearly in parallel with the moving direction of the edge b of the measurement object a is installed. The linear guide 22 is controlled by, for example, an AC servo motor 22a. The photographing machine 1 is configured to move in parallel with the moving direction of the edge b of the measurement object a by the linear guide 22 moved in a straight line so that the edge b can be continuously photographed. The cable guide 23 reciprocates in the moving range of the photographing machine 1. The cable guide 23 is arranged next to the linear guide 22 on the upper surface of the travel plate 21a.

  The photographing machine 1 is controlled to move while following at the same speed as the moving speed of the edge b that extends and moves in a predetermined direction by pressure molding of the measurement object a. That is, the moving photographing machine 1 is driven and controlled by the AC servo motor 22a of the linear guide 22 so that the edge b of the moving measuring object a extending by pressure molding is positioned in front of the photographing lens. Yes.

  The photographing machine 1 is provided with an infrared transmission filter 1a. The infrared transmission filter 1a transmits infrared rays and blocks visible light. That is, the measuring object a that is extended by pressure molding and is moving continuously emits infrared rays, so that the photographing machine 1 takes a white image. On the other hand, since the portion that is not the measurement object a is in the visible light range, it is blocked by the infrared transmission filter 1a, and the photographing machine 1 takes a black image.

  That is, the photographing machine 1 captures black and white images of the edge b of the measuring object a that extends and moves by pressure molding through the infrared transmission filter 1a. As described above, the portion of the measurement object a including the edge b is photographed in white, the portion that is not the measurement object a is photographed in black, and the boundary line portion between white and black is the edge b.

  The control device 3 detects the edge b of the measurement object a based on the photographing information from the photographing device 1 and controls the photographing device 1 so as to be movable. For example, a computer such as a personal computer is used. The control device 3 includes an image processing unit 4, a central processing unit 5, a drive processing unit 6, and the like.

  The image processing unit 4 of the control device 3 has a function of detecting and processing the edge b of the measurement object a based on the photographing information from the photographing machine 1. The detection processing result of the edge b is sent to the central processing unit 5. In addition, a function of calculating a deviation between an area reference line 42 and an edge b, which will be described later, provided in the frame of the edge detection area 41 from the edge detection information is also provided. This deviation information is also sent to the central processing unit 5.

  In order to detect the edge b of the measurement object a, an edge detection area 41 is designated in the image processing unit 4. The edge detection area 41 of the image processing unit 4 is specified so as to include the edge b of the measurement object a photographed by the photographing machine 1 through the infrared transmission filter 1a.

  The edge detection area 41 is composed of an elongated rectangular frame in the extending direction of the measurement object a during pressure molding. A plurality of edge detection areas 41 can be designated in the height direction of the measurement object a. The height of the frame of the edge detection area 41 is, for example, in the range from 5 mm to the height of the measurement object a. As the number of designated edge detection areas 41 increases, the edge b of the complex-shaped measurement object a can be measured more precisely. When there is one edge detection area 41, that area is designated, and when a plurality of edge detection areas 41 are designated, one of them is designated as a representative. That is, when there is one edge detection area, that area is designated as one of the areas, and when one of the areas is designated, one of them is designated as a representative, and the photographing machine is moved based on the edge detection information. The detection information of other edge detection areas is not used for moving the photographing machine, but is displayed on the display unit as a reference value.

  An area reference line 42 is provided in the frame of the edge detection area 41. The area reference line 42 is formed in parallel with the direction of the edge b of the measurement object a. The area reference line 42 divides the frame of the edge detection area 41 into two. The area reference line 42 is controlled so as to always overlap the edge b of the measurement object a in the representative edge detection area 41.

  The central processing unit 5 of the control device 3 sends the measurement parameter information input through the HMI processing device 7 described later to the image processing unit 4, and the detection information of the edge b of the measurement object a sent from the image processing unit 4. The information is sent to the display device 71 of the HMI processing device 7 which will be described later, and is converted into information for driving the photographing machine 1 based on the detection information of the edge b of the measurement object a from the image processing unit 4 to the drive processing unit 6. Perform functions such as sending.

  The drive processing unit 6 of the control device 3 functions to drive and control the AC servomotor 22 a of the linear guide 22 based on information from the central processing unit 5. The photographing machine 1 is driven and controlled through an AC servo motor 22a according to control information from the drive processing unit 6.

  The HMI processing device 7 is a (Human Machine Interface) processing device that is used by a computer to allow a human to operate the machine, and for the machine to notify the current state and the human, and includes a display device 71, an input device 72, and the like. . For example, a liquid crystal display is used for the display device 71, and a keyboard or a mouse is used for the input device 72, for example.

  The display device 71 of the HMI processing device 7 is a device that displays an image so that the worker can visually confirm and understand the edge detection information received by the central processing unit 5. The input device 72 is a device for inputting measurement parameters and the like, and the measurement parameters are read into the central processing unit 5 from the HMI processing device 7.

  When the measurement object a extends by pressure molding and the edge b moves, the area reference line 42 also moves in the same direction so as to overlap the edge b. The movement of the area reference line 42 is achieved by controlling the AC servo motor 22a of the linear guide 22 to move the photographing machine 1. The AC servomotor 22a is driven and controlled by the drive processing unit 6 according to control information.

  In the image processing unit 4 of the control device 3, a gray scale value of, for example, 0 to 255 is obtained at the time of photographing one of the edge candidates detected in the edge measurement area 41, for example, the white discrimination area 41 a. If the white ratio is 50% or more, for example, when the black discrimination area 41b is shot, for example, the gray scale value at 0 to 255 is less than the predetermined value, for example, 100 If the black ratio is 70% or more, the edge is recognized as the edge b of the measurement object a. The time taken for detection is, for example, 0.05 seconds. In addition, although the predetermined value of the gray scale in 0-255 is set to 100, it is not limited to this value, For example, any value of the range of 90-110 is possible as a predetermined value.

  In addition, when the image processing unit 4 of the control device 3 wants to recognize the edge b of the measurement object a more surely than the above, one of the edge candidates, for example, the white discrimination area 41a is photographed. For example, when the gray scale value at 0 to 255 is equal to or greater than a predetermined value, 100 or more is regarded as white, the white ratio is 70% or more, and the other is, for example, 0 to 255 at the time of shooting the black discrimination area 41b, for example. When the gray scale value is less than a predetermined value, and less than 100 is regarded as black, the black ratio is 80% or more. Similarly, although the predetermined value of the gray scale from 0 to 255 is set to 100, it is not limited to this value, and the predetermined value can be any value in the range of 90 to 110, for example.

  By the way, in the image processing unit 4 of the control device 3, the gray scale value at 0 to 255, for example, at the time of photographing one of the edge candidates, for example, the white discrimination area 41 a, is a predetermined value or more, temporarily 100 or more. The white ratio is 50% or less. On the other hand, for example, when the black discrimination area 41b is shot, the gray scale value at 0 to 255 is less than a predetermined value, for example, less than 100 is considered as black. When the ratio is 70% or less, the edge candidate is not the edge b of the measurement object a.

In this case, if a plurality of edge candidates are detected, the image processing unit 4 of the control device 3 obtains the black and white ratio of the discrimination areas 41a and 41b on both sides of the adjacent edge candidate again. The gray scale value at 0 to 255 is equal to or greater than a predetermined value, and 100 or more is regarded as white, and the white ratio is 50% or more, and the gray scale value at 0 to 255 is less than a predetermined value, for example, less than 100 The edge b is searched until an edge having black ratio of 70 or more is found. If the black-and-white ratio determination is not performed for all the detected edge candidates, or no edge candidate is detected, it is assumed that the edge b which is the end of the measurement object a is not found.

Next, the usage method based on the structure of the form for implementing the said invention is demonstrated below.
A heating metal that emits infrared rays, such as a red hot pressing material such as a forged material or a rolled material, is taken out of the heating furnace. This red hot pressure molding material is the measurement object a. Since the measurement object a which is a red hot pressure molding material is heated to 650 ° C. or higher, infrared rays are emitted from the surface thereof. The infrared light passes through an infrared transmission filter 1 a provided in the camera 1 and is photographed as white by the camera 1. On the other hand, the ambient temperature of the measurement object a, which is a red hot pressing molding material, is 650 ° C. or less, and therefore the visible light around the measurement object a cannot be transmitted through the infrared transmission filter 1a and is photographed black by the camera 1. become.

  That is, only the shape of the measurement object a, which is a heated metal red-hot pressure molding material that emits infrared rays, can be photographed through the photographing machine 1 including the infrared transmission filter 1a. In addition, at that time, the background around the measurement object a, which is a red hot molding material, is recognized by visible light, but the visible light is blocked by the infrared transmission filter 1a as already touched. The background around a does not become an obstacle when recognizing the shape of the measurement object a.

  In addition, in order to prevent a part of the apparatus used for pressure-molding the measurement object a which is a red-hot pressure molding material of heated metal that emits infrared rays from being damaged by this high temperature, a part of the apparatus is cooled with cold water. doing. Although water vapor is generated during cooling, infrared rays emitted from the surface of the object to be measured, which is a red hot pressing molding material of a heated metal that emits infrared rays, pass through the water vapor, thereby hindering photographing with the camera 1. Never become.

  The measurement object a which is the heated red hot pressure molding material is set on, for example, a ring mill 101 as a pressure molding apparatus for pressure molding. At this time, the above-described photographing machine 1 is positioned on the side of the edge b of the measurement object a which is a red hot pressure molding material that extends and moves during pressure molding. The photographing machine 1 is mounted so as to be able to move on the traveling path 21 following the moving direction of the edge b. The movement of the photographing machine 1 is controlled by an AC servo motor 22 a of a linear guide 22 attached on the traveling path 21.

  For example, the edge b which is the outer shape of the measurement object a which is a red hot pressing molding material set on the ring mill 101 is provided in the designated edge detection area 41 while photographing with the photographing machine 1 having the infrared transmission filter 1a. The photographing machine 1 is moved and controlled by the AC servo motor 22a of the linear guide 22 on the travel path 21 so as to overlap the area reference line 42. The AC servomotor 22 a is driven and controlled by control information from the drive processing unit 6 of the control device 3.

  After aligning the edge b which is the outer shape of the measurement object a of the red hot pressing molding material with the area reference line 42, for example, the ring mill 101 is driven to press the measurement object a which is the red hot pressing molding material, such as rolling. Perform molding. The measurement object a, which is a red hot pressing material, is extended in the diameter direction. Thereby, the edge b of the measuring object a moves extending in a predetermined direction.

  When the rolling operation of the measurement object a, which is a red hot pressing material, starts, the photographing machine 1 takes an image of the edge b of the measurement object a in 0.05 seconds, for example, and based on this, the image processing unit 4 of the control device 3 is taken. Then, it is determined and recognized whether or not the edge candidate detected in the edge detection area 41 in 0.05 seconds is the edge b of the measurement object a. At this time, the ring of the measurement object a is small and is molded in 1 minute, and the ring is large and is molded in 3 minutes. However, the photographing time by the camera 1 is constant regardless of the molding time, and is in units of 0.1 second. Since the shooting can be repeated with, the responsiveness is satisfied.

  In addition, the numerical value used for detection may differ depending on the accuracy. A candidate edge is detected in the edge measurement area 41, and when it is sandwiched, for example, when a white discrimination area 41a is photographed, for example, the gray scale value at 0 to 255 is a predetermined value or more. 100 or more is regarded as white, and the white ratio is 50% or more. On the other hand, for example, when the black discrimination area 41b is photographed, the gray scale value at 0 to 255 is less than a predetermined value, for example, less than 100 is regarded as black. When the black ratio is 70% or more, the edge candidate is recognized as the edge b of the measurement object a.

  In order to reliably select the edge b of the measurement object a from the edge candidates, the following numerical values are used. When the detected edge candidate is sandwiched, for example, when the white discrimination area 41a is photographed, the gray scale value at 0 to 255, for example, is a predetermined value or more, and 100 or more is regarded as white, and the white ratio is 70%. On the other hand, for example, when photographing in the black discrimination area 41b, for example, when the gray scale value at 0 to 255 is less than a predetermined value and less than 100 is regarded as black, and the black ratio is 80% or more, the edge Is recognized as the edge b of the measurement object a.

  Since the edge b of the measurement object a to be rolled is rolled and moved in a predetermined direction, the photographing machine 1 also moves following this movement. As described above, the photographing machine 1 continues to move so that the area reference line 42 in the representative edge detection area 41 overlaps the moving edge b. By controlling the AC servo motor 22a of the linear guide 22, the photographing apparatus 1 overlaps the edge b of the measurement object a on which the area reference line 42 moves. The AC servomotor 22 a is driven and controlled by control information from the drive processing unit 6 of the control device 3.

  At this time, if the edge b of the measurement object a is not determined, if a plurality of edge candidates are detected, the black and white ratio is detected again with the adjacent edge candidate, and the edge b of the measurement object a is determined. Find out. When all the black-and-white ratio determinations for all detected edge candidates are negative, the edge b of the measurement object a is not detected, and the deviation between the area reference line 42 and the edge b is set to zero. That is, since the area reference line 42 is already considered to overlap the edge b, the photographing machine 1 is temporarily stopped. The photographing machine 1 is stopped by stopping and controlling the AC servomotor 22a of the linear guide 22 according to control information from the drive processing unit 6 of the control device 3.

  Even when no edge candidate is detected, the edge b of the measurement object a is not detected, and the deviation between the area reference line 42 and the edge b is set to zero. That is, since the area reference line 42 is already considered to overlap the edge b, the photographing machine 1 is temporarily stopped.

  When the edge b is detected in the next photographing after the photographing machine 1 is temporarily stopped, the AC servomotor 22a of the linear guide 22 is driven and controlled based on the deviation based on the edge detection information, and again the photographing machine. 1 follows and moves so that the area reference line 42 overlaps the edge b of the measurement object a.

  In this way, the displacement amount of the outer shape during the pressure molding of the measurement object a which is a red hot pressure molding material coincides with the distance traveled by the camera 1, so that the positional accuracy of the camera 1 in the moving direction is measured as it is. It becomes the measurement accuracy of the object a. That is, the outer shape of, for example, the molding ring of the measurement object a can be correctly measured in a non-contact state based on the moving distance of the photographing machine 1.

Next, the measurement procedure will be described based on the flowchart of the non-contact type outer shape measuring apparatus for the red hot-pressed molding material by edge measurement in FIG.
Prior to the start of measurement, the measurement points, that is, the number of measurement areas and the height of each area are set and input. The input is performed through an input device 72 such as a keyboard or a mouse. If there is an input omission, the system waits until it is input.

  When the measurement is started, measurement parameters are transmitted from the HMI processing device 7 to the central processing unit 5 and read. The read measurement parameters are sent as information to the central processing unit 5 of the control device 3, and the central processing unit 5 sets shooting conditions based on the sent measurement parameters. The photographing machine 1 photographs the edge b of the measurement object a that is rolled and formed by the ring mill 101. The photographing information photographed by the photographing machine 1 is sent to the image processing unit 4 of the control device 3, and edge detection is performed by the image processing unit 4 based on the photographing information, and the edge b is recognized.

  As described above, the image processing unit 4 of the control device 3 calculates a deviation between the area reference line 42 and the edge b from the edge recognition information, and sends the deviation information to the central processing unit 5 as the deviation information. The edge recognition information is sent from the image processing unit 4 of the control device 3 to the central processing unit 5. Deviation information based on the edge recognition information received by the central processing unit 5 is displayed on the display device 71 of the HMI processing device 7 so that it can be visually confirmed and understood by the operator.

  In the central processing unit 5, deviation information based on the edge recognition information sent from the image processing unit 4 is converted into information that can be processed by the drive processing unit 6 and sent to the drive processing unit 6. The drive processing unit 6 of the control device 3 controls driving of the AC servomotor 22a of the linear guide 22 based on the deviation information from the received edge recognition information, undergoes rolling forming, and moves to extend in a predetermined direction. The photographing machine 1 is caused to follow and move so that the area reference line 42 overlaps the edge b of the object a.

  When the rolling forming in the ring mill 101 is completed, the drive processing unit 6 of the control device 3 stops driving the AC servomotor 22a of the linear guide 22, and the measurement is completed.

  When the measurement is not finished, the photographing parameters are set by the central processing unit 5, and the photographing of the edge b of the measurement object a that is rolled by the ring mill 101 is performed by the photographing machine 1, and the above-described operation is repeated.

Further, the edge recognition procedure in the image processing unit 4 of the control device 3 will be described below based on the edge recognition flowchart of FIG.
This edge recognition is repeatedly performed for each of all edge detection areas. Further, edge discrimination is repeated for each of the plurality of edge candidates detected in the edge detection area, and the edge b of the measurement object a is recognized.

  Edge recognition is sequentially processed from the first edge detection area. In each edge detection area, edge candidates are first detected. When there are one or more edge candidates in the edge detection area, the process proceeds to a discrimination process. On the other hand, when there is no edge candidate, it recognizes that there is no edge, does not perform edge discrimination processing, and moves to the next edge detection area with zero deviation.

  When there are one or more edge candidates, first, the first edge candidates are discriminated sequentially. When the gray scale value of one discrimination area of each edge candidate is sequentially considered as white when the value is equal to or greater than a predetermined value, this white ratio is 50% (70% when accuracy is high) or more, and the gray of the other discrimination area If the scale value is less than a predetermined value as black and the black ratio is 70% (or 80% when accuracy is high) or more, the edge is recognized as the edge b of the measurement object a, and the next edge Move to the detection area.

On the other hand, when the white ratio of each edge candidate is sequentially less than 50% (70% when accuracy is high), it is determined that there is no edge and the edge candidate is not the edge b of the measurement object a. Similarly, when the black ratio is less than 70% (80% when accuracy is high), it is determined that there is no edge and the edge candidate is not the edge b of the measurement object a. When it is determined that the edge candidate is not the edge b of the measurement object a, if there is another edge candidate that has not been subjected to edge determination, the edge determination process is performed again on the edge candidate. If the edge determination has been performed for all edge candidates, the edge determination process ends.
As described above, if even one edge is detected among the detected edge candidates, the edge candidate is recognized as the edge b of the measurement object a. On the other hand, if there is no edge for all the edge candidates, it is recognized that there is no edge b of the measurement object a in the edge detection area.

  In this way, the result of whether or not one edge b is recognized in one edge detection area is obtained.

  If there is an edge in one edge detection area, the deviation between the edge recognized as edge b and the reference line is calculated. On the other hand, when there is no edge, the deviation is zero.

While the recognition results and deviation information of the respective edge detection areas that are sequentially recognized are held, the recognition of the edges in all the edge detection areas is repeated.
The recognition results of all edge detection areas are transmitted from the image processing unit 4 to the calculation unit 5.

  The present invention is not limited to the embodiment for carrying out the invention, and it goes without saying that various modifications can be made without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Camera 1a Infrared transmission filter 2 Camera moving device 21 Traveling path 21a Traveling plate 21b Support leg 22 Linear guide 22a AC servo motor 23 Cable guide 3 Controller 4 Image processing part 41 Edge detection area 41a White discrimination area 41b Black Discriminating area 42 Area reference line 5 Central processing unit 6 Drive processing unit 7 HMI processing device 71 Display device 72 Input device a Measurement object b Edge 101 Ring mill

Claims (4)

An object to be measured that is a red hot pressure molding material of a heated metal that emits infrared rays, and continuously captures an edge that is an outer shape of the measurement object at the time of pressure molding, and the edge moves in a predetermined direction by pressure molding and moves A camera equipped with an infrared transmission filter that moves following the moving direction of the camera is movably disposed on the side of a pressure molding device that press-molds the measurement object, and the camera passes through the infrared transmission filter. Photographing the edge of the measurement object,
Based on the photographing information from the photographing machine, an edge candidate is detected by designating an elongated edge detection area in the extending direction of the measurement object at the time of pressure molding, and the detected edge candidate is sandwiched between the edge detection areas. When the gray scale value at the time of shooting one of the discrimination areas is regarded as white when the gray scale value is more than a predetermined value, the white ratio is 50% or more, and when the gray scale value at the time of shooting the other discrimination area is less than the predetermined value as black A control device for recognizing the edge candidate as an edge of a measurement object and controlling the photographing machine so as to be movable when the black ratio is 70% or more,
A non-contact type external shape measuring device for a red hot press molding material by edge measurement. When a candidate for an edge detected in the edge detection area is sandwiched, the gray scale value at the time of shooting one of the determination areas is regarded as white when the predetermined value or more is regarded as white, and the white ratio is 70% or more. 2. The non-contact type of a red hot pressing molding material by edge measurement according to claim 1, wherein a gray scale value of less than a predetermined value is regarded as black, and the black ratio is 80% or more and the edge candidate is recognized as an edge of a measurement object. Outline measuring device. The non-contact type outer shape measuring device for a red hot press molding material by edge measurement according to claim 1 or 2, wherein a plurality of edge detection areas are designated in the height direction of the measurement object. The camera that continuously captures the edge of the measurement object follows the movement of the edge of the measurement object by moving the area reference line so that it overlaps the edge movement of the measurement object that moves in the specified direction under pressure. The non-contact-type external shape measuring apparatus of the red hot press molding material by the edge measurement according to claim 1.

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