JPH0557569A - Numerically controlled machine tool and measuring device thereof - Google Patents

Abstract

PURPOSE:To perform the measuring of one side size of either of paired works related with each other and the machining of the other side of these works by means of existing arrangements so simply and accurately in a short time. CONSTITUTION:A hydraulic system 3, driving a slide unit 1, is controlled by a digital controller 4, a work 5 on this slide unit 1 is photographed by a camera, the image is processed by a vision system 9, detecting a machining end face of the work 5, and the slide unit 1 is positioned, thus a distance from a reference line of the image to the machining end face is calculated. Then, data for machining the work being paired with the work 5 are originated from the calculated distance and an amount of travel of the slide unit 1, transmitting them to a machining part. Measurement by the vision system 9 and positioning by the digital controller 4 both are performable at a micron unit, and also measuring and machining can be done parallelly at a real time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an NC machine tool and its measuring device.

[0002]

2. Description of the Related Art Conventionally, when processing a sleeve and a spool of a proportional valve, first, a large number of sleeves are processed first, and the size of the processed sleeves is measured and recorded by an operator at several places with a micrometer. The current spool was processed for each item.

[0003]

By the way, in the above-mentioned conventional method, there is a measurement error and a processing error due to a human, and in order to eliminate waste, high accuracy is required for the dimension measurement and processing of the sleeve and the spool, and the skill However, there is a problem in that it requires time for a specialized worker, and that it takes time because the work is divided into many steps, and there is a problem in that there are variations in measurement and machining errors due to manual work. Also,
There is the problem of producing unmatched sleeves or spools. Therefore, an object of the present invention is to easily and accurately measure and process a pair of workpieces that are related to each other, such as a sleeve and a spool of a proportional valve, and that require high machining accuracy. An object of the present invention is to provide an NC machine tool and a measuring device capable of preventing unpaired objects from occurring.

[0004]

In order to achieve the above object, the first aspect of the present invention is to measure the size of either one of a pair of works which are related to each other as shown in FIG. Is a measuring device in an NC machine tool that processes one of the above-mentioned workpieces on the basis of the above, and includes a movable support base 1 that supports one of the above-mentioned workpieces 5 and the above-mentioned support base 1. Drive device 3 to drive
And position detecting means 2 for detecting the position of the support base 1,
The camera 8 that captures the work 5 supported by the support base 1 detects the machining end face of the work 5 based on the image captured by the camera 8, and determines the distance between the machining end face and the image reference position. The image processing means 92 for calculating and the driving device 3 are controlled to move the support base 1, and the moving distance of the support base 1 is calculated based on the detection result of the position detection means 2 to perform the image processing. A digital controller 4 that stops the support base 1 when the means 92 detects the processing end face and outputs the movement distance of the support base 1 at the stopped position; and the movement distance output by the digital controller 4. Processing data creating means 92 for creating processing data for processing the other one of the works 18 from the calculation result of the video processing means 92.
And a transmitting means 93 for transmitting the processed data created by the processed data creating means 92.

The second aspect of the present invention, for example, as shown in FIGS. 1 and 2, measures the size of either one of a pair of workpieces that are related to each other, and uses the measured size as a reference to determine the actual size. N which processes either of the above works
A C machine tool, which is a movable support base 1 for supporting one of the works 5, a first drive device 3 for driving the support base 1, and a first for detecting the position of the support base 1. The position detecting means 2, the camera 8 showing the work 5 supported by the support 1, the processing end face of the work 5 is detected based on the image taken by the camera 8, and the processing end face and the image reference position. The image processing means 92 for calculating the distance between the supporting table 1 and the first driving device 3 is moved to move the supporting table 1, and the supporting table 1 is received based on the detection result of the first position detecting means 2. Of the first digital controller 4 that calculates the moving distance of the supporting table 1 and outputs the moving distance of the supporting table 1 at the stopped position when the image processing means 92 detects the processing end surface. And the first The processing data creating means 92 for creating processing data for processing the other one of the works 18 and the processing data creating means 92 from the moving distance output by the digital controller 4 and the calculation result of the video processing means 92. Transmission means 9 for transmitting the created processed data
3, a receiving means 167 for receiving the processing data transmitted by the transmitting means 93, a tool rest 11 for working the other one of the workpieces 18, a second driving device 14 for driving the tool rest 11, 15, the second position detecting means 12 and 13 for detecting the position of the tool rest 11, and the receiving means 1 based on the detection results of the second position detecting means 12 and 13.
The second drive device 14, 1 so as to machine one of the other works 18 according to the machining data received by 67.
And a second digital controller 16 for controlling No. 5 are provided.

[0006]

In the measuring apparatus according to the first aspect of the present invention, one of the pair of workpieces (for example, the sleeve and the spool of the proportional control valve) 5 (for example, the sleeve) 5 which are related to each other is processed first. The processed sleeve 5 is supported by the support base. Then, the driving device 3 is controlled by the digital controller 4 to move the support base 1. The camera 8 images the sleeve 5 supported by the support base 1, and the image processing means 92 detects the processed end face based on the image captured by the camera 8. When the image processing means 92 detects the processing end face, it calculates the distance between the detected processing end face and the image reference position, and at the same time issues a stop command to the digital controller 4. The digital controller 4 calculates the moving distance of the support base 1 based on the detection result of the position detection means 2 for detecting the position of the support base 1, while the digital controller 4 operates the support base 1 by a stop command from the video processing means 92. It is stopped, and the moving distance of the support base 1 at the stopped position is output. This moving distance corresponds to the distance from the moving origin at the position where the support 1 is stopped to the image reference position. Therefore, the value obtained by adding the calculation result of the image processing means 92 to this movement distance is the distance from the movement origin to the processing end surface. Based on the moving distance output by the digital controller 4 and the calculation result of the video processing unit 92, the processed data creating unit 92 determines the work 18 of the other one.
Create processing data for processing. Then, the transmitting means 93 transmits the processed data. In this way, since the image processing means 92 and the digital controller 4 measure the work 5, the measurement can be performed easily, in a short time, and with high accuracy. Further, since the machining data for machining the other work is created based on this measurement result and transmitted, the transmitted machining data is received, and the above-mentioned machining data is received based on the received machining data. By combining it with a machine tool that processes the other workpiece, it is possible to perform accurate processing in parallel with measurement, and there is no possibility of unpaired objects.

The NC machine tool of the second invention has a receiving means 167 for receiving the machining data transmitted by the transmitting means 93 of the measuring apparatus to the measuring apparatus of the first invention, and the work 18 of the other one of the above. A tool rest 11 for machining the tool rest, second driving devices 14 and 15 for driving the tool rest 11, and second position detection means 12 for detecting the position of the tool rest 11.
13 and the detection results of the second position detecting means 12 and 13, and controls the second drive devices 14 and 15 so as to process one of the other works 18 according to the processing data received by the receiving means 167. Since the second digital controller 16 is added, the measurement of either one of the pair of works 5 and the machining of the other work 18 can be performed simply and in a short time.
Moreover, it can be performed with high precision, and there are no unpaired items.

[0008]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a schematic configuration diagram of a measuring unit 100 of a hydraulic NC machine tool according to an embodiment of the present invention, and FIG. 2 is the hydraulic NC described above.
It is a schematic block diagram of the work part 200 of a machine tool. This hydraulic NC machine tool is for processing the spool of a proportional valve (direct type servo valve), measures the dimensions of the sleeve machined in advance with an electric discharge machine, etc., and based on the measured dimensions, Depending on the current situation, spool processing will be done in real time.

The measuring unit 100 comprises a slide unit 1 which is movable in the horizontal direction, a linear scale 2 which detects the position of the slide unit 1, and a slide unit 1.
A hydraulic device 3 as a drive device or a first drive device for driving the motor, and a digital controller 4 for controlling the hydraulic device 3.
A lamp 6 for irradiating the work (sleeve) 5 on the slide unit 1 with light and its power source 7, a camera 8 for photographing the sleeve 5, and a processed end surface of the sleeve 5 (hereinafter, The vision system 9 detects the edge), calculates the position of the detected edge, creates processing data based on the position data, and transmits the created processing data to the working unit 200. The hydraulic device 3 includes a cylinder 31 that drives the slide unit 1, a pump 32, and a cylinder 31.
A valve 33 for controlling the speed and direction of the cylinder 31 interposed between the pump 32 and the pump 32, and a driver 34 for driving the valve 33 in response to a command from the digital controller 4. The digital controller 4 includes a microcomputer (hereinafter, referred to as a microcomputer) 41, a program memory 42, various interfaces 43, 44, 45, 46 for the linear scale 2, the hydraulic device 3, and the vision system 9, and these. It is composed of a bus line 47 for connecting the. Further, the vision system 9 detects an edge (a boundary between light and dark) based on the camera interface 91 and an image received via the camera interface 91, and calculates the distance from the reference line to the edge position in micron units. , A microcomputer 92 as image processing means and processing data creating means for creating processing data based on the calculation result and data representing the moving distance of the slide unit 1 sent via the communication interface 46 of the digital controller 4. And a communication interface 93 for transmitting the machining data created by the microcomputer 92 to the working unit 200 and transmitting and receiving data to and from the digital controller 4, and an external interface 94 for transmitting and receiving control signals to and from the digital controller 4. And the bus line that connects these And a down 95.

On the other hand, the working section 200 includes a tool rest 11 for machining a spool, a linear scale (X scale) 12 for detecting the X position of the tool rest 11, and a linear scale for detecting the Z position of the tool rest. (Z scale) 13, a hydraulic device 14 as a second drive device for moving the tool rest in the X-axis direction, and a hydraulic device 15 for moving the tool rest in the Z-axis direction.
And a digital controller 16 that controls the hydraulic devices 14 and 15 based on the processing data transmitted from the measuring unit 100 and the feedback data from the scales 12 and 13. The hydraulic device 14 is a turret 1.
Cylinder (X cylinder) 141 that drives 1 in the X-axis direction
And a valve for controlling the speed and direction of the X cylinder 141 interposed between the pump 32 and the X cylinder 141.
(X valve) 142 and a driver for driving the X valve 142 according to a command from the digital controller 16
(X driver) 143. Similarly, the hydraulic device 15 is a cylinder that drives the tool rest 11 in the Z-axis direction.
(Z cylinder) 151, pump 32 and Z cylinder 151
A valve (Z valve) 152 for controlling the speed and direction of the Z cylinder 151 interposed between the Z valve 151 and the Z valve 152 according to a command from the digital controller 16.
And a Z driver 153 for driving the. Also,
The digital controller 16 includes a microcomputer 161 and
The program memory 162 and the linear scale 12,
13, various hydraulic interfaces 14, 15, the vision system 9 and various interfaces 1 with the built-in equipment 17 of this machine tool
63 to 168 and a bus line 169 connecting these. Based on the machining data sent from the vision system 9 and the feedback data from the X scale 12 and the Z scale 13, the microcomputer 161 controls the hydraulic devices 14 and 15 to process the work (spool) 18. To do.

FIG. 3 shows the actual size of the sleeve 5 (A1, B1, C
1) and processing dimensions of spool 18 (A2, B2, C2)
And the amount of movement of the cutting edge for machining (A3, B3, C3),
It is a figure which shows the job movement amount (A4, B4, C4) for measurement. Here, for example, the edges E1 and E2 of the sleeve
The distance A1 between them is the difference F1, F2 between the reference lines 301, 302 and the edge positions (bright and dark boundary positions) 401, 402 captured by the camera 8 in the job movement amount A4 from the edges E1 to E2. It is the added value. That is, A1 = A4-F1 + F2. The detection of the edge position and the measurement of the distance between the reference line and the edge position are performed by the procedure shown in FIG. That is, the slide unit 1 is operated by the digital controller 4.
When the microcomputer 92 of the vision system 9 detects the boundary between white and black (edge position) in the image of the camera 8, the digital controller 9 stops the job movement and positions the slide unit 1. I do. This positioning can be done in microns. When the positioning is completed, the vision system 9 measures the distance between the reference line and the edge position in micron units. When the measurement is completed, the process moves to the next end face. Since the positioning and the measurement are performed in the unit of micron as described above, the measurement can be performed with extremely high accuracy. The moving amount A3 of the cutting edge shown in FIG.
It is a value obtained by adding 1 to the width (L) of the cutting edge and the work correction amount.
That is, A3 = A1 + L + work correction amount. This work correction amount is the degree of wrapping of the spool with respect to the sleeve, that is, the difference between A1 and A2.
It is set for each product. Hereinafter, similarly, B1 = B4-F2 + F3 B3 = B1-L + work correction amount C1 = C4-F3 + F4 C3 = C1 + L + work correction amount The following machining data for moving the tool rest 11 is transmitted from the vision system 9 of the measuring unit 100 to the digital controller 16 of the working unit 200. That is, basic dimension data (program data of step 0) X0 in which the amount of movement from the machine origin to the machining origin is added to a cutting edge correction amount described later, and program data X1 of step 1 in which work coordinates and work dimensions are added to this X0. And the program data X2 of step 2 in which A3 is added to this X1, the program data X3 of step 3 in which B3 is added to this X2, and the program data X4 of step 4 in which C3 is added to this X3. .. This program data is described as follows. X0 = blade edge correction amount + machining origin movement amount X1 = X0 + work coordinate + work dimension X2 = X1 + A3 X3 = X2 + B3 X4 = X3 + C3 Then, based on this program data X1, X2, X3, X4, A and B shown in FIG. , C are cut.

Next, the operation of this embodiment will be described with reference to the flow charts shown in FIGS. FIG. 5 is a flowchart showing the overall procedure, FIG. 6 is a flowchart showing the measurement procedure, and FIG. 7 is a flowchart showing the processing data creation procedure. In FIG. 5, the device is first initialized in step S0, and then the sleeve 5 is set on the slide unit 1 in step S1. Next, in step S2, the digital controller 4 controls the hydraulic device 3 to move the slide unit 1 smoothly from the origin. Then, in steps S3 to S4, the vision system 9 recognizes the change in the shade of the image captured by the camera 8,
If the change in density is such that it can be recognized as a change on the end surface, the boundary between the light and shade is regarded as an end surface (edge), and the digital controller 4 is instructed to stop the job movement. The digital controller 4 stops the job movement according to the stop command. Then, in step S5, the digital controller 4 positions the slide unit 1 at an arbitrary position, and when the positioning is completed, the vision system 9
Measures the distance from the reference line to the light and shade boundary line representing the end face. Then, in some cases, the processes of steps S3 to S5 are performed again in order to improve the accuracy, and the movement amount with the digital controller 4 is also collated. If the amount of movement does not match in a few collations, the system goes down. Next, in step S7, the processing data described above is created from the measurement data and the movement amount sent from the digital controller 4, and in step S8, the processing data is transmitted to the digital controller 16 of the working unit 200. Then, in step S9, the working unit 200 moves the slide unit of the tool rest 11 based on the sent data. By repeating the above operation for A, B, and C (see FIG. 3), the measurement of one sleeve and the processing of the spool forming a pair with the sleeve are completed (step S1).
0). When the above measurement and processing are completed, the processed spool is measured in step S11, and step S12
Then, the measurement data of the sleeve and the measurement data of the spool are collated. Then, in step S13, as a result of the collation, it is determined whether the size of the spool is within the standard value, and if it is not within the standard value,
When it is determined that the width L of the blade edge needs to be corrected, the correction data (hereinafter referred to as the blade edge correction amount) is created.
If the deviation from the standard value is too large, it is determined that the cutting edge is in a defective state, and NG processing is performed. Next, in step S14, the above-mentioned blade edge correction amount is sent to the working unit 200,
Returning to step S9, spool machining is corrected.

In the measurement procedure of FIG. 6, step S21
The steps from S28 to S28 are the same as steps S2 to S8 in FIG.
The procedure from step S29 to step S30 corresponds to the procedure up to step S10 to step S11 in FIG.
It corresponds to the procedure of. If it is determined in step S29 that the sleeve measurement and the spool processing are completed, the process returns to step S21 to measure the next sleeve, or the processed spool is measured in step S30, and a series of measurement is completed. After doing step S2
Return to 1.

In the procedure of creating the processed data of FIG. 7,
In steps S41 to S45, the program data of steps 0 to 4 described above is created and transmitted to the machining unit. Then, steps S46 to S49
Then, the blade tip correction amount is calculated by measuring the processed spool, the blade tip width is corrected by the blade tip correction amount, and the program data for the next time and thereafter is created based on the corrected blade tip width.

In this way, the measurement of the dimensions of the pre-processed sleeve is carried out by the measuring section 100 equipped with the vision system 9 and the digital controller 4, and the measuring section 100 equipped with the digital controller 16 is used. Since the spool is processed in real time in parallel with the measurement based on the measurement data, the sleeve can be measured and the spool can be processed easily and in a short time with high accuracy. Also, there will be no unpaired sleeve and spool. In the above embodiment, the case where the sleeve is measured and the spool is processed has been described, but the present invention is not limited to the sleeve and the spool, and can be generally applied to a pair of works related to each other.

[0016]

As is apparent from the above, in the measuring device in the NC machine tool of the first invention, the digital controller controls the drive device for driving the support base for supporting the work and the position of the support base. The moving distance of the support base is calculated based on the detection result of the position detection means for detecting the position, the camera copies the work supported by the support base, and the image processing means based on the image captured by the camera. The machining end face of the work is detected, and the distance between the machining end face and the image reference position is calculated, and the machining data creating means moves the support base calculated by the image processing means and the digital controller. Since the machining data for machining the work paired with the above-mentioned work is created from the distance, and the transmitting means transmits the machining data, Easily measured in a short time, yet can be performed accurately. Then, when the machining data transmitted by the transmitting means is received and used in combination with a machine tool for machining the pair of works based on the received machining data, the machining of the works is performed in parallel with the measurement in real time. It can be done and all the work pieces are paired and waste is eliminated.

In addition, the NC machine tool of the second aspect of the invention is the same as the measuring apparatus of the first aspect of the invention, and in addition to the receiving means for receiving the processing data transmitted by the transmitting means, the NC machine tool is the above pair. A tool rest for processing a workpiece, a second drive device for driving the tool rest, a second position detecting means for detecting the position of the tool rest, and a detection result of the second detecting means for receiving the above Since the second digital controller that controls the second drive device to machine the pair of workpieces according to the machining data received by the means is provided, the measurement and machining of the pair of workpieces can be easily performed in real time. In addition, it can be performed with high accuracy, and all processed products are paired to eliminate waste.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a measuring unit according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a working unit of the above embodiment.

FIG. 3 is a diagram showing an actual size of a sleeve, a processing size of a spool, a movement amount of a cutting edge for processing, and a job movement amount for measurement in the above-described embodiment.

FIG. 4 is a diagram showing an edge detection method in the above embodiment.

FIG. 5 is a flowchart showing the overall procedure in the above embodiment.

FIG. 6 is a flowchart showing a measurement procedure in the above embodiment.

FIG. 7 is a flowchart showing a procedure for creating processed data in the above embodiment.

[Explanation of symbols]

1 ... slide unit, 2 ... scale, 3 ... hydraulic device,
4 ... Digital controller, 5, 18 ... Work, 6 ... Lamp, 8 ... Camera, 9 ... Vision system, 11 ... Turret, 12, 13 ... Scale, 14, 15 ... Hydraulic system, 1
6 ... Digital controller, 92 ... Microcomputer, 93, 1
67 ... Communication interface.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigehiro Yamanaka 1-1 Nishiichitsuya, Settsu-shi, Osaka Daikin Industries, Ltd. Yodogawa Works (72) Inventor Yufumi Sumitomo Nishiichitsuya 1-1, Settsu-shi, Osaka Daikin Industries, Ltd. Yodogawa Works (72) Inventor Susumu Nishijima 1-1, Nishiichitsuya, Settsu-shi, Osaka Daikin Industries Ltd. Yodogawa Works

Claims (2)

[Claims] 1. A dimension of one of a pair of workpieces that are related to each other is measured, and the measured dimension is used as a reference,
A measuring device in an NC machine tool for machining one of the above-mentioned works according to the present situation, which is a movable support stand (1) for supporting one of the above-mentioned works (5), and the support stand (1). Drive device (3)
And position detecting means (2) for detecting the position of the support base (1)
And a camera (8) showing the work (5) supported by the support base (1), and a processing end face of the work (5) is detected based on the image taken by the camera (8), and The image processing means (92) for calculating the distance between the processed end surface and the image reference position, and the drive unit (3) are controlled to control the support base.
When (1) is moved, the moving distance of the support base (1) is calculated on the basis of the detection result of the position detecting means (2), and the image processing means (92) detects the processed end surface. A digital controller (4) that stops the support base (1) and outputs the moving distance of the support base (1) at the stopped position, the moving distance output by the digital controller (4), and the video processing. Processing data creating means (92) for creating processing data for processing the other work (18) from the calculation result of the means (92), and processing data created by the processing data creating means (92). And a transmitting means (93) for transmitting the. 2. A dimension of one of a pair of workpieces that are related to each other is measured, and the measured dimension is used as a reference,
An NC machine tool for machining one of the above-mentioned works according to the present situation, which drives a movable support base (1) for supporting the one work (5) and the support base (1). First drive
(3), a first position detecting means (2) for detecting the position of the support base (1), and a work supported by the support base (1).
The camera (8) showing (5) and the processing end face of the work (5) are detected based on the image taken by the camera (8), and the distance between the processing end face and the image reference position is calculated. The image processing means (92) and the first driving device (3) are controlled to move the support base (1), and the support base is received based on the detection result of the first position detection means (2). The moving distance of (1) is calculated, and when the image processing means (92) detects the processing end face, the support base (1) is stopped, and the support base (1) is moved at the stopped position. Based on the first digital controller (4) that outputs a distance, the moving distance output by the first digital controller (4), and the calculation result of the video processing means (92), the other work.
Processing data creating means (92) for creating processing data for processing (18), transmitting means (93) for transmitting the processing data created by the processing data creating means (92), and the transmitting means (93 Receiving means (167) for receiving the processing data transmitted by the above), a tool post (11) for processing one of the other works (18), and a second drive device for driving the tool post (11). (14, 15), second position detecting means (12, 13) for detecting the position of the tool rest (11), and receiving means based on the detection results of the second position detecting means (12, 13) A second digital controller for controlling the second drive device (14, 15) so as to process the other work (18) according to the processing data received by (167).
(16) An NC machine tool characterized by comprising: