JP2922724B2 - Horizontal spindle origin correction method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically correcting the origin when a horizontal spindle such as a spindle head or an attachment is indexed at an arbitrary turning angle.

[0002]

2. Description of the Related Art For example, FIGS.
In the case where a turning spindle head 103 having a vertical spindle 101 and a horizontal spindle 102 as shown in FIG. 1 is provided, and the cutting is performed with the horizontal spindle, since the machine position is different between the vertical spindle and the horizontal spindle, a program for the horizontal spindle is used. In order to realize these changes in position, correction is required. Conventionally, machining with the horizontal main spindle is often performed in the X and Y-axis directions as shown in FIG. 11, and is generally called five-face machining together with machining in the Z-axis direction with the vertical main spindle.

In the case of the five-face machining, since the machining origin is determined by the vertical main axis, it is necessary to correct the vertical main axis in four directions on the X and Y axes of the horizontal main axis. The difference between the tip position when the reference tool T is mounted on the vertical spindle and the tip position when the reference tool T is mounted on the horizontal spindle as shown in FIGS. Measure,
Figure 7, x ₁ ~x ₄ as shown in FIG. _{8, y 1 ~y 4, z} 1
Register it in search of a total of 12 correction values to z ₄ advance, how to shift the working origin by reading the corresponding value <br/> has been employed.

[0004]

The method of performing the origin correction by registering the correction values in the four directions on the X and Y axes described in the prior art is based on a method in which the horizontal main axis is moved with respect to the X and Y axes. There is a problem that correction cannot be performed when machining is performed by indexing to an arbitrary turning angle having an angle. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the related art, and an object of the present invention is to provide a switching part of a quadrant when a horizontal main shaft is indexed at an arbitrary angle. It is an object of the present invention to provide a method of calculating an accurate correction amount that is smoothly and continuously included, and automatically correcting the origin of the horizontal spindle.

[0005]

To achieve SUMMARY OF to the above objects, the origin correction method of the horizontal spindle of the present invention, a vertical main
Rotation indexable in the axis and horizontal plane and at the center of rotation
Horizontal spindle provided at a position offset from the main spindle
This is a method for correcting the origin of the horizontal spindle of a machining center.
And the vertical main axes in each of the four directions on the X and Y axes of the horizontal main axis.
Measure the reference length of the representative length and offset amount for
And store it based on the standard length standard correction amount.
X, Y before and after the quadrant to which the arbitrary turning angle of the horizontal spindle belongs
The average of the representative lengths in the two directions of the load is averaged, and the turning angle within the quadrant is calculated.
Find the representative length of the horizontal spindle corresponding to the
Of the turning angle in the quadrant based on the reference correction amount
The amount of offset in the X and Y axes before and after the quadrant
Off of the horizontal spindle corresponding to the turning angle within the quadrant
The set length was determined, and the representative length of the horizontal spindle in the quadrant was determined.
And the offset amount at the turning angle position in the quadrant
A correction amount is obtained, and the correction amount is used at the turning angle within the quadrant.
The origin of the horizontal spindle is corrected .

[0006]

When the turning angle command value of the horizontal spindle is input, the reference correction amounts in the front and rear two directions of the quadrant to which the turning command value belongs are called out of the pre-stored reference correction amounts in the X and Y directions. A correction amount corresponding to the turning angle is calculated based on the reference correction amounts in the two directions by calculation, and the origin is automatically corrected by the obtained correction amount.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described with reference to FIGS. In the gate-type machining center shown in FIG. 1, a table 2 is movably positioned on an X-axis guide provided on a bed 1, and a top beam is placed on columns 3 erected on both sides of the bed 1. 4 is fixed. A sliding surface in the Z-axis direction is formed on the front surface of the column 3, and the cross beam 5 is provided on the sliding surface so as to be movable and positionable. The crossbeam 5 are set cut sliding surfaces of the Y-axis direction, the spindle head 6 is rests movably positioned on the sliding surface. A ram 7 is provided on the spindle head 6 so as to be movable and positioned in the Z-axis direction. A turning spindle head 11 is attached to the tip of the ram 7 so as to be able to turn and index at an arbitrary angle in a horizontal plane.

A vertical spindle 8 and a horizontal spindle 12 are rotatably mounted on the revolving spindle head 11 by a plurality of bearings (not shown). The horizontal spindle 12 is driven by the vertical spindle 8, and the horizontal spindle 12 and the vertical spindle 8 are rotated. A reference tool T can be attached to the tip of the. FIG. 3 is a block diagram showing only the part related to the present invention in the circuit in the NC device. The reference correction amount setting unit 13 sets the turning spindle head 11 to X,
The reference length x ₁ to the representative length and offset amount as shown in FIGS. 7 and 8 measured in advance when indexed in four directions on the Y axis.
_{x 4, y 1 ~y 4,} z 1 ~z 4 parts to set. The reference correction amount storage unit 14 is a part for storing the set reference correction amount.

The angle input reading unit 15 reads a turning angle command value of the turning spindle head 11 specified by a program, and the arithmetic processing unit 16 calculates a correction amount by a formula described later.
₁ arithmetic circuit 19, L ₂ arithmetic circuit 21, L arithmetic circuit 22, and E ₁ arithmetic circuit 23, E ₂ the arithmetic circuit 24, E arithmetic circuit 2
5, a Dx, Dy, Dz operation circuit 26 is built in. The correction amount storage unit 17 is a unit for storing the calculated correction amount, and the origin offset unit 18 is a unit for offsetting the origin based on the correction amount.

Next, the correction amount D of the horizontal spindle 12 when indexing to an arbitrary turning angle θ is determined from the reference correction amounts of the horizontal spindle 12 of the turning spindle head 11 in the four directions on the X and Y axes obtained in advance. The formula to be obtained will be described. Four directions on the X and Y axes (0 °, 9
0 °, 180 °, and 270 °) as C ₁ ,
Assuming that C ₂ , C ₃ , and C ₄ , C ₁ = (x ₁ , y ₁ ,
z ₁ ), C ₂ = (x _2, y ₂ , z ₂ ), C ₃ = (x ₃ ,
y ₃ , z ₃ ) and C ₄ = (x ₄ , y ₄ , z ₄ ).

As shown in FIG. 4, if the distance from the turning center O of the turning spindle head 11 to the tip of the reference tool T is L and the tool correction value of the tool used is L ', .DELTA.OAB, .DELTA.Oab,
ΔOA′B ′ are all similar, and points A, a, A ′ and points B, b, B ′ exist on the same circle. Therefore, the correction value of the point b to be obtained has a relationship with the correction values of the points B and B 'actually measured in advance. The equations for obtaining these correction values (Dx, Dy, Dz) are given by the following equations 1 and 2, number 3,
Equation 4 is divided into four.

[0012]

(Equation 1)

(Equation 2)

(Equation 3)

(Equation 4) 4 and 5 show the case where 0 ° ≦ θ <90 °, and for simplicity of description, only the offset amount E is shown assuming that the error between the center of the vertical main axis and the center of the horizontal main axis is zero. Therefore, the center of the vertical main axis and the center of rotation of the horizontal main axis are the same point O. Incidentally, the line segment representing the typical length shown in FIG. 4, _5, AO = L 1, and _{A'O = L 2, aO = L} , the line segment representing the amount of offset, AB = E _1, A' B '=
Express as E ₂ , ab = E. L 'is the difference between the tool length of the tool actually processed and the reference tool, and the length differs depending on the tool.

Next, the operation of this embodiment will be described in the order of the flowchart of FIG. In step S1, the angle input reading unit 15 reads the turning angle command value θ of the spindle head 11, and in step S2, the reference correction values in the front and rear two directions of the quadrant to which the turning angle θ belongs, for example, C _{1 and} C ₂ are corrected. It is called from the quantity storage unit 14. In step S3, determining the representative length L ₁ of the point from the correction value, for example C ₁ of the previous quadrant contained commanded angle θ is. At this time, the correction amount in the offset direction is not taken into account. Then step S
In 4, it obtains the representative length L ₂ of the point from the correction value, for example, C ₂ immediately following the quadrants contained commanded angle θ is.
At this time, the correction amount in the offset direction is not considered.

Subsequently, in step S5, a representative length L at the commanded angle position from the load average with respect to the commanded angle is obtained from the obtained L ₁ and L ₂ by the following equation. L = (α−θ / α) · L ₁ + (θ / α) · L ₂ where α = 0, 90 °, 180 °, or 270 °.
Next, in step S6, from the offset amounts E ₁ and E ₂ before and after the quadrant including the commanded angle, the offset amount E at that angle position is determined from the load average for the commanded angle by the following equation. E = (α−θ / α) · E ₁ + (θ / α) · E ₂ Then, in step S7, the correction amounts Dx, Dy, and Dz are obtained from the obtained E and L. In step S8, the obtained correction values are obtained. Is stored in the correction amount storage unit 17, and the origin offset is executed by the origin offset unit 18 in step S9.

[0015]

Since the present invention is configured as described above, the following effects can be obtained. The reference correction amounts in four directions on the X and Y axes of the horizontal main axis measured in advance are stored, and when a turning angle command for the horizontal main axis is input, the reference in the front and rear two directions of the quadrant to which the command turning angle belongs is stored. The correction amount is read out, the correction amount is calculated according to the turning angle based on the reference correction amount by calculation, and the origin correction is performed, so that when the quadrant changes, the continuous correction always matches the reference correction amount. This makes it possible to obtain a correction amount to be performed, and to perform automatic origin correction, thereby enabling automatic operation of multi-face machining.

[Brief description of the drawings]

FIG. 1 is a view of a machining center.

FIG. 2 is a side view of a turning spindle head.

FIG. 3 is a block diagram of a circuit according to the present embodiment in an NC device.

FIG. 4 is an explanatory diagram of an equation for obtaining a correction value, wherein a turning angle is 0 °
FIG. 9 is a top view illustrating a case where ≦ θ <90 °.

FIG. 5 is a side view of FIG. 4;

FIG. 6 is a flowchart for explaining the operation of the embodiment.

FIG. 7 shows reference correction amounts (x _{1 to} x ₄ , y _{1) in} four directions of X and Y.
FIG. ₄ is an explanatory diagram illustrating the related art.

FIG. 8 is an explanatory diagram showing a reference correction amount (z _{1 to} z ₄ ) in the Z-axis direction, and is a diagram cited also in the prior art.

FIG. 9 is a front view of a conventional turning spindle head for explaining the technology.

FIG. 10 is a side view of FIG. 9;

FIG. 11 is a schematic diagram illustrating five-side processing for explanation of a conventional technique.

[Explanation of symbols]

 7 Ram 8 Vertical spindle 11 Turning spindle head 12 Horizontal spindle

Claims (1)

(57) [Claims] (1) Rotation indexing is possible in a vertical main axis and a horizontal plane.
Noh and at a position offset from the center of rotation
Of the horizontal spindle of the machining center with the horizontal spindle
A method of correcting the origin, comprising four directions on the X and Y axes of the horizontal spindle.
The representative length and offset amount for each vertical spindle
The reference correction amount is measured and stored in advance, and the standard of the representative length is set.
The arbitrary turning angle of the horizontal spindle belongs to the correction amount based on the correction amount.
The average length of the representative length in the X and Y axes before and after the quadrant
The representative length of the horizontal spindle corresponding to the turning angle in the quadrant is
Calculated based on the standard correction amount of the offset amount.
In the two directions of the X and Y axes before and after the quadrant to which the turning angle belongs.
The weighted average of the offset amount corresponds to the turning angle in the quadrant
To obtain the offset amount of the horizontal spindle,
At the representative length of the horizontal spindle and the turning angle position within the quadrant
The correction amount is obtained from the offset amount, and the correction amount is used to calculate the
The origin of the horizontal spindle at the turning angle within the limit is corrected.
The method of correcting the origin of the horizontal spindle of the machining center.