JP2007275928A - Metal mold drawing inflow measuring system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a metal mold drawing inflow measuring system capable of actually measuring the inflow of a work during working and checking the good or bad of the face quality of manufactured goods due to the excess and deficiency of the inflow and capable of automatically reporting the occurrence, if any, of defective goods, and stopping the working line. <P>SOLUTION: The system is provided with a marker moving means (a wire rope 6 mounted with the marker, and a weight 7 for holding the wire rope in an always tense state) for moving the position of the marker 5 for image measurement according to the drawing inflow of the work 3, and an image measurement operation apparatus 10 which computes the drawing inflow of the work 3 by performing image measurement of the moving quantity of the marker 5 (a camera 9, and an image processing apparatus 10 to compute the drawing inflow of the work 3 by capturing the output image of the camera 9). The computed drawing inflow is displayable on a display 11 and the outputting of an abnormal signal S1 from the image processing apparatus 10 by setting upper and lower limit values is possible as well. The reporting of the occurrence of the defective goods, if any, and the stopping of the working line are also possible. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a mold drawing inflow measuring device for measuring a work inflow during mold drawing.

  When a workpiece (metal plate material) is drawn by a mold, the draw bead suppresses excessive inflow of the workpiece that leads to generation of wrinkles. In this case, the control of the wrinkle pressure is important. That is, if the wrinkle holding pressure is insufficient, the generation of wrinkles cannot be prevented. In this way, the wrinkle holding pressure, in other words, the amount of inflow of the work is greatly related to the quality of machining, particularly the quality of the surface.

Conventionally, the techniques listed in Patent Documents 1 to 3 have been proposed in order to improve the processing quality in press working.
That is, Patent Document 1 is a technique for detecting cracks in the press line with a monitor camera, Patent Document 2 is a technique for using a CCD camera to adjust the amount of movement of the upper mold, and Patent Document 3 is a technique for detecting a deviation in posture. This is a technique for obtaining an attitude shift with respect to a reference attitude of a press-processed product from an image captured by a camera.
JP 2004-256866 A JP 2003-31350 A JP 2005-121599 A

The above prior art can be said to be a direct processing quality inspection technology in that each product is actually imaged using a camera. However, the surface quality is deteriorated due to the inflow of workpieces, especially wrinkles and breaks. It was not enough to prevent this.
Therefore, in practice, the surface quality due to the inflow of the workpiece was confirmed by machining simulation using a computer, but this method is not a method for checking and inspecting actual workpieces. When applied to a line, the simulation results were not always obtained. In addition, since it is not an inspection at the time of actual die press processing, even if a defective product occurs, it cannot be automatically notified or the processing line cannot be stopped. Sometimes it flowed into the process.

  The present invention has been made in view of the above circumstances, and can actually measure the inflow amount of a workpiece at the time of machining, and can confirm the quality of the surface quality of a workpiece resulting from the excess or deficiency of the inflow amount. Goods and defects can be confirmed and inspected accurately for processed products, and when a defective product is generated, it can be automatically informed or the processing line can be stopped. An object is to provide a quantity measuring device.

In order to achieve the above-mentioned object, a die drawing inflow measuring device according to claim 1 of the present invention is connected to a work to be drawn by a die, and an image corresponding to the drawing inflow of the work is obtained. Marker moving means for moving the position of the marker for measurement, and image measurement calculation means for calculating the amount of movement of the aperture of the workpiece by image measurement of the movement amount of the marker are provided.
The invention according to claim 2 of the claims is the invention according to claim 1, wherein the marker moving means has one end engaged with the measurement-side end portion of the workpiece and the appropriate position between the both ends. A wire rope to which a marker is attached, and a wire rope tensioning means for holding the wire rope in a state in which the marker is always stretched, and the image measurement calculation means is configured to move the marker from a position before machining to a position after machining. And an image processing device that takes in an output image of the camera and calculates the amount of inflow of the aperture of the workpiece.
A third aspect of the present invention includes a monitor display capable of displaying a photographed image of the camera and a calculation result of a work inflow amount of the work by the image processing device according to the second aspect of the present invention. It is characterized by that.
A fourth aspect of the present invention is the measure according to the third aspect, wherein the measure is arranged at a position photographed together with the marker by the camera with a graduation direction in a moving direction of the marker. It is characterized by providing.
According to a fifth aspect of the present invention, in the invention according to the second, third, or fourth aspect, the image processing device has upper and lower limits at which a calculation result value of the inflow amount of the work is predetermined. An abnormal signal is output when the value falls outside the range of values.

  According to the invention described in the above claims, it is possible to actually measure the inflow amount of the workpiece at the time of machining, and to confirm the quality of the surface quality of the work piece due to the excess or shortage of the inflow amount, that is, the actual work product Die squeeze flow rate measuring device that can accurately check and inspect for defects, inspect and automatically notify when a defective product occurs, or stop the processing line Can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the same code | symbol shows the same or an equivalent part between each figure.
First, the outline of the die press drawing process will be described with reference to FIG. 1. In the figure, 1 and 2 are molds used for processing, 1 is an upper mold, and 2 is a lower mold. The workpiece 3 to be drawn is put into both the molds 1 and 2 and the lower mold 2 before processing. After the workpiece 3 is put in, the upper die 1 is lowered, and the workpiece 3 is drawn according to the shapes of the upper and lower dies 1 and 2. The cushion ring 4 applies a reaction force upward during processing. Actually, a draw bead is provided in the upper mold 1 and the cushion ring 4, but is omitted in FIG. In addition, the arrow a in the figure indicates the pressurizing direction during processing.

FIG. 2 is a diagram showing a state in which the entire configuration of one embodiment of the present invention is applied to the drawing inflow measurement at the time of actual die pressing.
The mold aperture inflow measuring device according to the present embodiment includes a marker moving unit and an image measurement calculating unit.
In this case, the marker moving means is connected to a workpiece 3 such as an iron plate that is drawn by a mold (upper and lower dies 1 and 2), and the marker 5 for image measurement corresponds to the amount of drawn inflow of the workpiece 3. In this example, the wire rope 6 and the wire rope tensioning means, here, the weight 7 are provided.
Here, one end of the wire rope 6 is engaged with the measured side end of the work 3, the left end in the illustrated example, and the other end is extended in a direction opposite to the inflow direction of the work 3 and is engaged with the weight 7. Are combined. In this embodiment, a hook (not shown) attached to one end of the wire rope 6 is engaged with the work 3 at one end of the wire rope 6 by a through hole formed in the vicinity of the end of the work 3 on the side to be measured. It is the structure performed by inserting and engaging in (not shown). This is because it is easy to attach / detach (engage, detach) the wire rope 6 to / from the workpiece 3 in consideration that the measurement is performed in the actual processing line.
The weight 7 is a wire rope tensioning means for holding the wire rope 6 in a constantly stretched state and suppressing an impact force generated during processing. In the illustrated example, the wire rope 6 is hung around a pulley 8 and suspended. It is attached to the end.
The marker 5 is attached to an appropriate position between both ends of the wire rope 6, in the illustrated example, at a substantially central position in a horizontally stretched range from the position where the wire rope 6 is engaged with the work 3 to the pulley 8. The marker 5 is attached so as not to be detached from the wire rope 6 or shifted on the wire rope 6 due to vibration during processing or movement of the wire rope 6. The position of the marker 5 before processing is stored and held in the image measurement calculation means as a measurement reference position (data).

The image measurement calculation means is a means for calculating the amount of movement of the aperture of the work 3 by measuring the amount of movement of the marker 5, and is configured to include a camera 9 and an image processing device 10 in the illustrated example.
The camera 9 is a camera provided on the cushion ring 4 as shown in the figure, for example, so as to be able to photograph at least the movement of the marker 5 from the position before processing the workpiece to the position after processing. Here, a high-speed camera is used. It is used. If the movement of the marker 5 is slow, a popular camera such as a CCD camera may be used.
The image processing apparatus 10 is an apparatus that takes an output image of the camera 9 and calculates the movement distance of the marker 5 to calculate the amount of inflow of the aperture of the work 3. Any configuration may be used as long as the amount of movement of the marker 5 can be imaged and the amount of inflow of the aperture of the work 3 can be calculated. In this embodiment, a personal computer equipped with necessary calculation and control programs is used as the image processing apparatus 10.
The monitor display 11 is connected to the image processing apparatus 10, and can display a photographed image of the camera 9 and a calculation result of the inflow amount of the aperture of the work 3 by the image processing apparatus 10.

In the present embodiment, the image processing apparatus 10 can accumulate and store the calculation result of the inflow amount of the diaphragm for each workpiece 3 that is continuously processed, and can display this on the monitor display 11 when desired.
Further, a measure 12 is provided at a position photographed together with the marker 5 by the camera 9 in a state where the scale direction is directed to the moving direction of the marker 5, and the marker 5 is moved by the monitor display 11, in other words, at the time of processing. The state of the inflow of the work 3 can be visually confirmed, and the movement distance of the marker 5, that is, the amount of the inflow of the work 3 can be visually confirmed by the monitor display 11.
The image processing apparatus 10 can also display on the monitor display 11 a graph in which the stroke (movement amount) at the time of processing of the cushion ring 4 is taken and taken on the horizontal axis, and the inflow amount of the throttle is taken on the vertical axis.
Furthermore, in the present embodiment, the image processing apparatus 10 is in a case where the calculation result value of the inflow amount of the work 3 is out of the predetermined upper and lower limit value range, that is, exceeds the upper limit value or less than the lower limit value. In this case, the abnormal signal S1 is output. The abnormal signal S1 is used, for example, as a control signal for operating an informing means for informing such an abnormal situation or for stopping a machining operation of a die press drawing machine.
In the example shown in FIG. 2, a draw bead 13 is provided on the upper mold 1 and the cushion ring 4.

Next, the operation of this embodiment will be described.
In the die press working to which the drawing inflow amount measurement according to the present embodiment is applied as shown in FIG. 2, the drawing of the drawing inflow until the end of the die press drawing as shown in FIG. This will be described with reference to FIG.
Now, when machining is started and a pressing force is applied in the direction shown by the arrow A in the figure, the workpiece 3 moves as shown by the arrow B in response to the deformation, that is, flows into the throttle. Accordingly, the wire rope 6 whose one end is engaged with the measured side end of the workpiece 3 is also moved as indicated by the arrow C, and the marker 5 is similarly moved as indicated by the arrow C.
The camera 9 captures the movement of the marker 5, and the image processing apparatus 10 displays it on the monitor display 11, so that the movement of the marker 5, that is, the state of the diaphragm 3 flowing into the work 3 can be visually observed.
The image processing apparatus 10 can capture a moving image of the marker 5 that is an output image of the camera 9 and can calculate a moving distance of the marker 5 by image measurement. To display. The displayed calculation result of the throttle inflow amount is measured (actual measurement) at the time of actual machining.

According to this, the inflow amount of the workpiece at the time of machining can be measured, and the quality of the surface quality of the processed product due to the excess or deficiency of the inflow amount can be confirmed. That is, it is possible to accurately check and inspect the quality and defect of an actual processed product.
Therefore, when a defective product occurs, it can be automatically notified or the processing line can be stopped. That is, the image processing apparatus 10 outputs the abnormal signal S1 when the calculation result value of the throttle inflow amount of the work 3 is out of the range of the predetermined upper and lower limit values. If this abnormal signal S1 is used as a control signal for operating an informing means for notifying an abnormal situation or for stopping a machining operation of a die press drawing machine, it automatically notifies when a defective product occurs. In addition, the processing line can be stopped, and defective products can be prevented from flowing into subsequent processes such as welding and painting.
If the upper and lower limit values are appropriately set, for example, it is possible to easily know or estimate the occurrence of wrinkles by notifying that the upper limit value has been exceeded, or by notifying that the upper limit value is less than the lower limit value. It becomes.
In the present embodiment, the image processing apparatus 10 does not simply calculate and display the aperture inflow amount. At the same time, the stroke (movement amount) at the time of machining the cushion ring 4 is taken from the die press drawing machine, and the change in the inflow amount of the throttle against the stroke of the cushion ring 4 from the start to the end of the machining (one step) is graphed and monitored It is also possible to display on the display 11.
FIG. 4 is a diagram showing such a graph with BHF (wrinkle holding force) divided into two cases of high and low cases. Thus, by simultaneously displaying a plurality of graphs on the monitor display 11, for example, in a range where the surface quality of a processed product can be secured to a certain level or more, examination of the minimum dimensions of the workpiece 3 necessary for processing is performed in one step. It becomes possible based on the inflow amount transition data visualized over the whole, and it is useful for cost reduction.

  The marker 5 may be provided on the wire rope 6 in the range from the pulley 8 to the weight 7. A camera 9 is provided at a position where the movement of the marker 5 from a position before the workpiece machining to a position after the machining can be photographed, and a measure 12 is located at a position where the movement and movement distance of the marker 5 can be visually observed by the monitor display 11. Is provided in the same manner as in the above-described embodiment.

It is a schematic sectional drawing for demonstrating the outline | summary of a die press drawing process. It is a figure which shows the whole structure of one Embodiment of this invention in the state applied to the drawing inflow amount measurement at the time of actual die press work. It is a figure for operation | movement description of embodiment same as the above. It is a graph which shows the change of the amount of squeezing inflow with respect to the stroke of the cushion ring in one process.

Explanation of symbols

1: upper die (die), 2: lower die (die), 3: workpiece, 5: marker, 6: wire rope, 7: weight (wire rope stretching means), 9: camera, 10: image processing Device, 11: Monitor display, 12: Major.

Claims (5)

  A marker moving means that is connected to a workpiece to be drawn by a mold and moves the position of a marker for image measurement in accordance with the amount of the drawn inflow of the workpiece; An apparatus for measuring the amount of inflow of a mold aperture, comprising image measurement operation means for calculating the amount of inflow. The marker moving means includes a wire rope having one end engaged with the end of the workpiece to be measured and attached with the marker at an appropriate position between the both ends, and a wire rope tension for holding the wire rope in a constantly stretched state. Providing means,
The image measurement calculation means includes a camera capable of photographing the movement of the marker from a position before the workpiece processing to a position after the processing, and an image processing for calculating an inflow amount of the workpiece by taking an output image of the camera The apparatus for measuring an inflow amount of a mold restrictor according to claim 1, comprising: a device.   3. The mold aperture inflow measuring device according to claim 2, further comprising a monitor display capable of displaying a photographed image of the camera and a calculation result of a workpiece inflow inflow by the image processing device.   4. The mold aperture inflow measuring device according to claim 3, further comprising a measure disposed at a position photographed together with the marker by the camera with a scale direction directed to a moving direction of the marker. 5. The image processing apparatus according to claim 2, 3 or 4, wherein the image processing device outputs an abnormal signal when a calculation result value of the inflow amount of the workpiece is out of a predetermined upper / lower limit value range. The mold throttle inflow measuring device described.

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