JPH09103840A - Method and device for measuring of reference position of mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To precisely measure a reference position of the mark arranged on the surface of a molding flask or mold. SOLUTION: By traversing an upper position of one of a V-shaped groove at a mark with a proximity reflection type optical displacement sensor, a distance between the proximity reflection type optical displacement sensor and the surface of V shaped groove is measured, among obtained measured values, the related equation concerning to arbitrary two measured values at one inclined face of V shaped groove is deduced as one regression line by a regression equation of a least squaring method, etc., in the same way, the related equation concerning to two measured values at the other side inclined face is deduced as one regression line by the regression equation of a least squaring method, etc. From the intersecting point of two regression lines, by deducing a coordinate of one point of the deepest part of V shaped groove, in the same way, by deducing coordinates of three points of the deepest parts of V shaped groove of remaining three points, the intersecting point O of two line parts connecting two points facing each other among four points of the deduced V-shaped deepest part is obtained, the intersecting point O is made to the reference position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for measuring a reference position of a mold and an apparatus therefor, and more particularly, it is a mark engraved at a predetermined position on the surface of a casting mold or a mold and has a V-shaped cross section. Method and apparatus for measuring a reference position, which is the center of what is formed by four grooves which are formed in a mold shape and whose center lines are perpendicular to each other and abut each other to form a cross shape in a plan view Regarding

[0002]

2. Description of the Related Art As one of means for casting a casting, one in which a predetermined product cavity is formed by matching upper and lower molds containing a sand mold and pouring the molten metal into the cavity. is there. The mutual positioning of these upper and lower flasks is
This is performed by fitting a bush attached to either one of the upper and lower flasks and a dowel pin attached to the other flask. The positioning of the casting frame with respect to the model plate in the molding of the sand mold is performed by a method of fitting a reference pin protruding from the model plate or the mold molding machine into the bush.

[0003]

However, in the conventional method of aligning the upper and lower flasks as described above, when the bush is worn or the aligning pin is deformed, the product cavity formed is There was a problem that misalignment occurred between the upper and lower sand molds to induce defective castings. Therefore, a method has been proposed in which a casting mold or a mold is provided with a mark, the center portion of the mark is measured as a reference position, and the upper casting mold or the lower casting mold is moved to match the upper and lower casting molds. , There was still no way to accurately measure the reference position of the mark. The present invention has been made in view of the above circumstances, and an object thereof is a mark engraved at a predetermined position on the surface of a casting mold or a mold, which has a V-shaped cross section and a center line. A method and apparatus for easily and surely measuring a reference position which is a central portion of four grooves which are mutually abutted at right angles and are formed in a cross shape as a whole in a plan view. To provide.

[0004]

In order to achieve the above object, the method for measuring the reference position of the mold in the present invention is a casting mark or a mark engraved at a predetermined position on the surface of the mold, By the method of measuring the reference position which is the central part of the V-shaped and the center lines which are perpendicular to each other and abut each other to form four cross-shaped grooves as seen in a plan view as a whole. And a step of measuring the distance between the non-contact reflective optical displacement sensor and the surface of the V-shaped groove by crossing the position above the one V-shaped groove in the mark with the non-contact reflective optical displacement sensor. And a relational expression relating to any two measured values on one slope of the V-shaped groove among the measured values thus obtained, by a formula connecting these two measured values or a regression formula such as a least squares method. Derived as one regression line, and similarly The relational expression relating to the two measured values on the other slope of the V-shaped groove is derived as one regression line by a regression equation such as the least square method, and the intersection of these two regression lines is used to determine the V-shaped groove. Similarly to the step of calculating the coordinates of one point related to the deepest part, the step of calculating the coordinates of three points related to the deepest part of the remaining three V-shaped grooves in the mark, and the calculated V-shape. Among the four points related to the deepest part of the die groove, a step of obtaining an intersection O of two line segments connecting two points facing each other is provided.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail with reference to FIGS. As shown in FIG. 1, a laser beam length-measuring device 14 as a non-contact reflection type optical displacement sensor is displayed in XYZ coordinates above the sand mold 2 with a casting frame 1 sent from a mold making machine (not shown). A device is provided for moving in three dimensions possible. And
As shown in FIG. 2, bushes 19 for positioning the upper and lower flasks relative to each other are provided on both left and right sides of the upper surface of the flask 1.
Is attached, and a mark 20 is engraved on the bush 19. As shown in FIG. 2, this mark 20 is formed by four grooves which are formed by crossing the center lines at right angles to each other and forming a cross shape in a plan view as a whole. Three
Further, as shown in FIG. 4, the cross section has a V-shape. Further, as shown in FIG. 2, a vertically extending pin hole is provided in the central portion of the bush 19.

A ceiling portion of the portal frame 3 is arranged above the casting frame 1, and a left and right moving means 4 for X coordinate is mounted on the ceiling portion of the portal frame 3. . In the left-right moving means 4, a traveling platform 6 is movably mounted on a rail 5 laid on the portal frame 3, and the traveling platform 6 is mounted on the portal frame 3. The tip of the piston rod of the first servomotor type cylinder 7 is connected, and the traveling base 6 is reciprocally moved in the longitudinal direction of the gate type frame 3 by the expansion and contraction operation of the first servomotor type cylinder 7. ing.

A front-rear moving means 8 for Y coordinates is mounted on the traveling table 6 of the left-right moving means 4, and the front-rear moving means 8 extends in a direction orthogonal to the moving direction of the traveling table 6. To the linear guide mechanism 9 mounted on the traveling table 6,
The traveling frame 10 is mounted so as to be capable of traveling, and the tip of the piston rod of the second servomotor type cylinder 11 is connected to the traveling frame 10, and the traveling frame 10 is extended and contracted to cause traveling. The frame 10 is adapted to reciprocate in a direction orthogonal to the traveling direction of the traveling table 6.

The traveling frame 10 has a third servomotor type cylinder 1 as an elevating means 12 for Z coordinates.
3 is attached, and the laser length measuring device 14 is attached to the lower end of the piston rod of the third servomotor type cylinder 13. The laser length measuring device 14 has a controller 17
Are electrically connected to each other, and the controller 17 respectively determines the coordinates of four points related to the deepest part of the four V-shaped grooves in the mark 20, based on the measurement result of the non-contact reflection type optical displacement sensor 14. Further, it has a function as an arithmetic means for calculating the intersection and the intersection O of two line segments connecting two mutually opposed points out of the four points related to the deepest part of the V-shaped groove thus indexed. Further, the servomotors 7a, 11a of the first to third servomotor type cylinders 7, 11, 13 are
A control board 18 is electrically connected to 13a, and the control board 18 is electrically connected to the controller 17.

Next, using the device thus constructed,
A procedure for measuring the central portion of the mark 20 of the bush 19 will be described. First, the first, second and third servomotor type cylinders 7, 11 and 13 are appropriately expanded and contracted to move the laser length measuring device 14 to a position directly above the mark 20 of the sand mold 2. Then, the third servomotor type cylinder 13 is appropriately expanded / contracted to set the laser length measuring device 14 to a predetermined height, and subsequently, the first servomotor type cylinder 7 is expanded / contracted to generate the laser length measuring device 14 '. In FIG. 2, the value of the Y coordinate is kept constant at Ya and the value of the X coordinate is changed, and the distance between the laser length-measuring device 14 and the surface of the V-shaped groove at the Ya value is continuously and momentarily measured. .

The measurement result is recorded by a recorder (not shown) and displayed in XZ coordinates. Then, as shown in FIG. 3, among the measurement values thus obtained, the relational expression relating to any two measurement values a1 and a2 in FIG. 3 is expressed by a formula connecting these two measurement values or a least squares method. 1 according to the regression equation
It is derived as a regression line L1 of the book, and similarly, arbitrary two measured values a3 and a4 in FIG.
The relational expression between the two measured values a3 and a4 is displayed by XZ coordinates, and one regression line L is obtained by a regression equation such as the least square method.
2 and the coordinates (Xa, Ya) of the point A relating to the deepest part of the V-shaped groove from the intersection of these two regression lines L1 and L2.
Find out.

In the same manner as described above, the coordinates (Xc, Yc) of the point C relating to the deepest part of the V-shaped groove in FIG. 2 are calculated. Further, L3 and L4 in FIG. 4 are derived in the same manner as the regression lines L1 and L2, and these two regression lines L3 and L4 are drawn.
From the intersection of 4, the coordinates of B and D at the deepest part of the V-shaped groove (X
b, Yb) and (Xd, Yd). Then, FIG.
As shown in FIG. 3, when the intersection O of the line segment AC and the line segment BD is calculated, this intersection O becomes the reference position to be obtained.

In the above embodiment, the mark 20 is the bush 19.
However, it may be provided at an appropriate position on the surface of the flask 1 or the sand mold 2.

[0013]

As is apparent from the above description, according to the present invention, the non-contact reflective optical displacement sensor and the non-contact reflective optical displacement sensor are provided by crossing the upper position of one V-shaped groove in the mark with the non-contact reflective optical displacement sensor. A step of measuring the distance from the surface of the V-shaped groove, and a relational expression between any two measured values on one slope of the V-shaped groove among the measured values thus obtained,
A regression line such as a formula connecting these two measured values or a regression formula such as the least squares method is used to derive one regression line, and the relational expression between the two measured values on the other slope of the V-shaped groove is set to a minimum of 2 in the same manner. In the same manner as the step of deriving one regression line by a regression equation such as multiplication, and calculating the coordinates of one point relating to the deepest part of the V-shaped groove from the intersection of these two regression lines,
3 related to the deepest part of the remaining three V-shaped grooves in the mark
Since it has a step of determining the coordinates of each point, and a step of obtaining an intersection O of two line segments connecting two mutually facing points among the four points related to the deepest part of the V-shaped groove thus determined. , Which is engraved at a predetermined position on the surface of a casting mold or a mold, has a V-shaped cross section, and has center lines formed at right angles to each other and abutted to form a cross shape as a whole in a plan view 4
This has an excellent effect that the reference position, which is the center of the mark formed by the individual grooves, can be easily and reliably measured.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an embodiment of the present invention.

FIG. 2 is a diagram showing a plan view of a mark using XY coordinates.

FIG. 3 is a diagram showing an X-X cross section in FIG. 2 and a distance between a surface of the cross section and a laser length measuring device using ZX coordinates.

FIG. 4 is a diagram showing the YY cross section in FIG. 2 and the distance between the surface of this cross section and the laser length measuring device using ZY coordinates.

[Explanation of symbols]

 4 Left-right moving means 8 Front-back moving means 12 Elevating means 14 Laser length measuring device 17 Controller

Claims (2)

[Claims] 1. A plan view as a whole, which is a mark engraved at a predetermined position on the surface of a casting mold or a mold, has a V-shaped cross section, and has center lines formed at right angles to each other and abutting each other. Is a method of measuring a reference position, which is the center of what is formed by four cross-shaped grooves, and the upper position of one V-shaped groove in the mark is measured by a non-contact reflection type optical displacement sensor. Measuring the distance between the non-contact reflective optical displacement sensor and the surface of the V-shaped groove across the line, and any two of the measured values thus obtained on one slope of the V-shaped groove. The relational expression relating to the measured values is derived as one regression line by an equation connecting these two measured values or a regression equation such as the least square method, and similarly, two measurements on the other slope of the V-shaped groove are performed. The relational expression between the values is set to 1 by the regression equation such as the least square method. In the same manner as the step of deriving the regression line of one book and calculating the coordinates of one point related to the deepest part of the V-shaped groove from the intersection of these two regression lines, the remaining three V-shaped marks of the mark are similarly formed. The step of determining the coordinates of the three points related to the deepest part of the groove, and the intersection point O of the two line segments connecting the mutually facing two points of the four points related to the deepest part of the V-shaped groove A method of measuring a reference position of a mold, comprising: 2. A plan view as a whole, which is a mark engraved at a predetermined position on the surface of a casting mold or a mold and has a V-shaped cross section and whose centerlines are perpendicular to each other and abutted against each other. Is a device for measuring a reference position which is a central portion of what is formed by four cross-shaped grooves, and is a non-contact reflection type optical displacement sensor for measuring a distance to a surface of a mark of a casting mold or a mold. 14, elevating means 12 for elevating and lowering the non-contact reflection type optical displacement sensor, front and rear moving means 8 for moving the elevating means 12 and the non-contact reflection type optical displacement sensor 14 in the front and rear direction, and the front and rear moving means 8 , The elevating means 12 and the non-contact reflective optical displacement sensor 1
Based on the measurement results of the left and right moving means 4 for moving 4 in the left and right direction and the non-contact reflection type optical displacement sensor 14, the coordinates of four points related to the deepest part of the four V-shaped grooves in the mark are respectively determined. And a calculating means 17 for calculating an intersection point O of two line segments connecting two mutually opposed points out of the four points related to the deepest part of the V-shaped groove. Measuring device for mold reference position.