JP2020059085A - Precision adjustment apparatus, precision adjustment method, and precision adjustment program - Google Patents

Abstract

To provide a precision adjustment apparatus, a precision adjustment method, and a precision adjustment program that can output an appropriate adjustment position and adjustment amount when adjusting the precision of a machine tool.SOLUTION: A precision adjustment apparatus 1 includes: a storage unit 20 in which are stored simultaneous equations that define the relationship between the amounts of insertion of shims into a plurality of predetermined respective positions between components and conditions for limiting the amounts of insertion of the shims that are variables of the simultaneous equations to keep precisions within acceptable range with respect to measured values of predetermined precisions due to errors that occur between components constituting the machine tool when such components are mounted; and an arithmetic unit 11 that solves the simultaneous equations in response to input of measured values, and that outputs a solution that satisfies the conditions as the amount of insertion of the shims.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an apparatus, method and program for adjusting the accuracy of a machine tool.

In recent years, there is an increasing demand for external parts such as IT parts and ornaments that require long-time processing, and a cutting machine for processing these parts has been increased in production.
In the process of manufacturing and shipping a machine tool, accuracy adjustment and inspection are usually performed after processing and assembling each part. The precision adjustment is a work for adjusting an error generated when assembling finished parts within the tolerance to a predetermined precision by using an indicator, a cylinder square, or the like. This error often differs from machine to machine, and in particular, the accuracy on the basis of the table upper surface, which is important in a cutting machine, is greatly affected by the accuracy of the parts of the column, bed, and spindle head, and the accuracy of assembly, resulting in large variations. As described above, it is necessary to have a skill to stably adjust the accuracy with respect to the error that differs for each machine.

For example, regarding the accuracy based on the table top surface, adjustment of the error amount or squareness of the table top surface swing has been conventionally performed by the following method.
(1) The contact surface between the column and the bed is finely adjusted by polishing or scraping according to the accuracy measurement result at the time of temporary assembly.
(2) Insert shims (spacers) of about several tens of μm to several hundreds of μm between the column and the bed and between the column and the spindle head to perform fine adjustment.

JP, 2008-062037, A

However, these conventional methods have the following problems.
In the above-mentioned method (1), it is necessary to perform accuracy measurement with the column and the bed assembled once and polish the bed, the column, or both according to the measurement result. In this case, since the number of man-hours for polishing and assembling increases, it is not suitable for manufacturing a machine tool that requires mass production.
In the method (2) described above, the accuracy is adjusted by inserting the shim according to the result of accuracy measurement after the machine is assembled. Was required, and automation and mass production could not be supported.

  An object of the present invention is to propose a precision adjusting device, a precision adjusting method, and a precision adjusting program that can output an appropriate adjustment position and an appropriate adjustment amount when adjusting the precision of a machine tool.

  (1) An accuracy adjusting device (for example, an accuracy adjusting device 1 described later) according to the present invention is configured to adjust the accuracy to a measured value having a predetermined accuracy due to an error in mounting between components forming a machine tool. To limit the insertion amount of the shim, which is a variable of the simultaneous equations, with a simultaneous equation that defines the relationship of the insertion amount of the shim at each of a plurality of predetermined positions between the parts so as to be within the allowable range. A storage unit (for example, a storage unit 20 described later) that stores the condition of, and an arithmetic unit that solves the simultaneous equations with respect to the input of the measurement value and outputs a solution satisfying the condition as the insertion amount of the shim ( For example, the following calculation unit 11) is provided.

  (2) In the accuracy adjustment device according to (1), the storage unit may store a plurality of conditions according to the range of the measured value.

  (3) The accuracy adjustment device according to (1) or (2) is a coefficient determination unit that calculates the coefficient of the simultaneous equations by inputting the insertion amount of the shim and the measured values before and after inserting the shim. (For example, a coefficient determining unit 12 described below) may be provided.

  (4) In the accuracy adjusting device according to any one of (1) to (3), the accuracy includes a squareness of a spindle with respect to an upper surface of a table (for example, a table T described later) of the machine tool, and The shim for adjusting the perpendicularity may be inserted between a column (for example, a column C described below) and a bed (for example, a bed B described later) that configure the machine tool.

  (5) In the accuracy adjusting device according to any one of (1) to (4), the accuracy includes an error amount of swinging of a spindle in the machine tool, and the shim for adjusting the swing error amount. May be inserted between a column (for example, a column C described later) and a spindle head (for example, a spindle head H described later) that constitute the machine tool.

  (6) In the accuracy adjusting method according to the present invention, a computer (for example, an accuracy adjusting device 1 described later) uses a measurement value with a predetermined accuracy, which is caused by an error in mounting between components forming a machine tool, In order to keep the accuracy within the allowable range, a simultaneous equation that defines the relationship of the insertion amount of the shim at each of a plurality of predetermined positions between the parts, and the insertion amount of the shim that is a variable of the simultaneous equation is set. The limiting condition is stored, the simultaneous equations are solved for the input of the measured value, and the solution satisfying the condition is output as the insertion amount of the shim.

  (7) The accuracy adjustment program according to the present invention is for causing a computer to function as the accuracy adjustment device according to any one of (1) to (5).

  According to the present invention, an appropriate adjustment position and adjustment amount can be output when adjusting the accuracy of a machine tool.

It is a block diagram which shows the functional structure of the precision adjusting device which concerns on embodiment. It is a schematic diagram showing the composition of the cutting machine which the accuracy adjustment method concerning an embodiment makes object. It is a figure which illustrates the measurement result of the perpendicularity in the cutting machine which concerns on embodiment. It is a figure which illustrates the measurement result of the swing error amount in the cutting machine which concerns on embodiment. It is a figure which shows the fixed structure of the column and bed in the cutting machine which concerns on embodiment, and the insertion position of a shim. It is a figure which shows the insertion position of the shim seen from the upper surface of the bed in the cutting machine which concerns on embodiment. It is a figure which shows the example in which the squareness was adjusted by inserting the shim which concerns on embodiment. It is the figure which showed the insertion position of the shim with respect to the front sectional view of the spindle head in the cutting machine which concerns on embodiment. It is a figure which shows the example which the error amount of swinging was adjusted by the insertion of the shim which concerns on embodiment. It is a figure which shows the conditions for limiting the insertion amount of a shim when adjusting the squareness which concerns on embodiment. It is a figure which shows the conditions for limiting the amount of insertion of a shim when adjusting the amount of error of swinging concerning an embodiment.

Hereinafter, an example of the embodiment of the present invention will be described.
FIG. 1 is a block diagram showing a functional configuration of the accuracy adjustment device 1 according to the present embodiment.
The accuracy adjustment device 1 is an information processing device (computer) such as a server device or a personal computer, and includes a control unit 10 and a storage unit 20, and may further include various input / output and communication devices.

  The control unit 10 is a unit that controls the entire accuracy adjustment device 1, and realizes various functions in the present embodiment by reading and executing software (accuracy adjustment program) stored in the storage unit 20. . The control unit 10 may be a CPU.

  The storage unit 20 is a storage area for storing various programs and various data for causing the hardware group to function as the accuracy adjustment device 1, and may be a ROM, a RAM, a flash memory, a hard disk drive (HDD), or the like.

In the present embodiment, the storage unit 20 predetermines between the parts in order to keep the accuracy within a permissible range with respect to the measurement value of the predetermined accuracy due to an error in mounting between the parts constituting the machine tool. The simultaneous equations that define the relationship of the insertion amount of the shim at each of the plurality of positions that are stored are stored.
Further, the storage unit 20 stores a condition for limiting the insertion amount of the shim which is a variable of the simultaneous equations. This condition differs depending on the range of measurement values, and a plurality of conditions may be stored.

Here, the measured accuracy includes the perpendicularity of the spindle with respect to the table top surface of the machine tool. The shim for adjusting the squareness is inserted between the bed and the column that constitutes the machine tool.
Further, the measured accuracy includes the amount of error in swinging the spindle in the machine tool. The shim for adjusting the swing error amount is inserted between the column and the spindle head that configure the machine tool.

  The calculation unit 11 solves the simultaneous equations with respect to the input of the measured value, and outputs the solution satisfying the conditions as the amount of shims to be inserted at each position.

The coefficient determination unit 12 calculates the coefficient of the simultaneous equations by inputting the amount of shims to be inserted and the measurement values before and after the insertion of the shims.
The coefficients of the simultaneous equations are different for each type of machine tool due to differences in column weight, high column specifications, etc., and are therefore calculated in advance for each type. The coefficient may be determined by machine learning.

  In the present embodiment, the machine tool and the type of accuracy to be adjusted are not limited, but as an example, a method of adjusting the squareness of the cutting machine and the amount of swinging error will be described below.

FIG. 2 is a schematic diagram showing the configuration of the cutting machine targeted by the accuracy adjustment method according to the present embodiment.
The table T of the cutting machine is fixed to an LM block that slides on an LM (Linear Motion) guide provided on the bed B.
A column C is vertically fixed to the bed B by bolts. Further, the spindle head H is fixed to the LM block that slides on the LM guide provided on the column C.

Here, by adjusting the position and the amount of the shim to be inserted into the fixed portion A1 of the bed B and the column C, the inclination of the column C with respect to the upper surface of the table T and the inclination of the spindle head H are changed. Thereby, the perpendicularity of the vertical axis (Z axis) with respect to the upper surface of the table T is adjusted.
Further, by adjusting the position and amount of the shim to be inserted into the fixed portion A2 of the LM block that slides the LM guide on the column C and the spindle head H, the inclination of the spindle head H with respect to the upper surface of the table T changes. . As a result, the error amount of swinging the main shaft with respect to the upper surface of the table T is adjusted while maintaining the squareness.

  In this cutting machine, the X axis is defined as the right direction when viewed from the front, the Y axis is defined as the rear direction, and the Z axis is defined as the upward direction.

FIG. 3 is a diagram illustrating the measurement result of the squareness in the cutting machine according to the present embodiment.
In this example, the displacement amount in each of the X-axis direction and the Y-axis direction is measured when the position of the Z axis is 0 mm, that is, when the main shaft is raised from the upper surface of the table T to 300 mm.
The measured value P _x0 in the X-axis direction is the value measured from the positive direction of the X-axis, and the measured value P _{y0 in the} X-axis direction is the value obtained by measuring the contact amount of the dial gauge with respect to the cylindrical square roller. is there.

  This example shows that when the Z axis moves 300 mm, it moves 12 μm in the negative direction of the X axis and 12 μm in the negative direction of the Y axis, and the column C is tilted in the left front direction with respect to the upper surface of the table T. I know that

FIG. 4 is a diagram illustrating the measurement result of the swing error amount in the cutting machine according to the present embodiment.
In this example, the change in height with respect to the upper surface of the table T is measured by swinging the main shaft with a diameter of 300 mm.
The measured values X _l0 , X _r0 , Y _f0 , and Y _r0 are values obtained by measuring the contact amount of the dial gauge with respect to the block gauge installed on the upper surface of the table T from the Z-axis plus direction.

  In this example, the height was 0 at the -Y position on the front side, whereas it was moved by 18 μm, 12 μm, and 6 μm in the plus direction of the Z axis at the + Y, + X, and -X positions, respectively. Therefore, it can be seen that the tip of the main shaft is inclined vertically downward from the upper surface of the table T to the right rear direction.

FIG. 5A is a diagram showing a fixing structure of the column C and the bed B and the insertion position of the shim in the cutting machine according to the present embodiment.
In this example, the column C is fixed to the bed B by four left and right bolts. In addition, the shim insertion positions are provided at two places with each bolt hole sandwiched therebetween, for a total of 16 places.

FIG. 5B is a diagram showing the insertion position of the shim viewed from the upper surface of the bed B in the cutting machine according to the present embodiment.
Two shim insertion positions are provided for each of the four left and right bolt holes when viewed from the front.

Here, the insertion amounts of the shims at the insertion positions on the front side and the back side, which correspond to the i-th bolt hole from the back on the right side when viewed from the front, are R _fi and R _ri , respectively. The insertion amounts of the shims at the front and rear insertion positions corresponding to the bolt holes are L _fi and L _ri , respectively.
Further, the average insertion amount R _i = (R _fi + R _ri ) / 2 and L _i = (L _fi + L _ri ) / 2 of the two shims are defined. Note that R _fi = R _ri and L _fi = L _ri may be _satisfied .

FIG. 6 is a diagram showing an example in which the squareness is adjusted by inserting the shim according to the present embodiment.
In this example, a shim of L _r4 = L _f4 = 30 μm is inserted according to the measurement results of FIGS. 3 and 4.
As a result, the inclination of the column C is improved, and the measured value of the squareness after inserting the shim is 0 regardless of the Z-axis position.

The amount of swing error also changes due to this adjustment, and in this example, Y _r0 = −18 μm to Y _rp = −6 μm at the + Y position, and X _r0 = −12 μm to X _rp = −6 μm at the + X position. , −X at the position of −X changes from X ₁₀ = −6 μm to X _lp = 0 μm.

FIG. 7 is a view showing the insertion position of the shim with respect to the front sectional view of the spindle head H in the cutting machine according to the present embodiment.
The spindle head H is fixed to two LM blocks D provided on each of the two left and right LM guides, that is, a total of four LM blocks D.

The shim for adjusting the inclination of the spindle head H in the Y direction is inserted on the installation surface of the spindle head H on the LM block D. Here, one insertion position is provided for each LM block D, and the insertion amounts of the shims on the upper left side, the upper right side, the lower left side, and the lower right side are T _l , T _r , B _l , and _Br , respectively. .
Further, the average insertion amount B = (B ₁ + B _r ) / 2 and T = (T ₁ + T _r ) / 2 of the two shims are defined. Note that B ₁ = B _r and T _l = T _r may be satisfied.

  The shim for adjusting the inclination of the spindle head H in the X direction is inserted in the abutting surface between the LM block D and the projection E provided for positioning the spindle head H in the left-right direction (X-axis direction). To be done. Here, one insertion position is provided in each of the left LM blocks D, and the insertion amounts to the upper portion and the lower portion are St and Sb, respectively.

FIG. 8 is a diagram showing an example in which the amount of swinging error is adjusted by inserting the shim according to the present embodiment.
In this example, a shim of B ₁ = B _r = S _t = 10 μm is inserted according to the measurement result of FIG. 6 after the squareness is adjusted.
As a result, the inclination of the main axis is improved, and the measured value of the swing error amount after the shim insertion is zero at all positions.

Next, a simultaneous equation that defines the relationship between the displacement amount related to the squareness and the insertion position and the insertion amount of the shim will be described.
The perpendicularity P _{x in} the X-axis direction after inserting the shim can be defined as follows with respect to the measured value P _x0 before inserting the shim.
_{P x = P x0 + K x1} (R 1 -L 1) + K x2 (R 2 -L 2) + K x3 (R 3 -L 3) + K x4 (R 4 -L 4)
Further, the perpendicularity P _{y in} the Y-axis direction after inserting the shim can be defined as follows with respect to the measured value P _y0 before inserting the shim.
_{P y = P y0 + K y1} (R 1 + L 1) + K y2 (R 2 + L 2) -K y3 (R 3 + L 3) -K y4 (R 4 + L 4)

K _xi and K _yi are coefficients determined in advance by the coefficient determination unit 12. For example, among the insertion positions of a plurality of shims, a shim is inserted only in R ₁ to set R _{2 to} R ₄ and L _{1 to} L ₄ to 0, and the measured values of squareness before and after insertion are substituted into the equation. The coefficients K _x1 and K _y1 are determined. Similarly, by inserting the shims R ₂ , R ₃ , and R ₄ individually in order and substituting the squareness measurement values before and after the insertion into the equation, all the coefficients are determined in order.

The method of determining the coefficient is not limited to this. Coefficient determining unit 12, at least one of the values R ₁ to R ₄ and L ₁ ~L _4, and the equation obtained by substituting the measured values before and after insertion of the shim, by solving a plurality of simultaneous, calculates the coefficients .
The coefficient determination unit 12 may present the user with the preset insertion position of the shim necessary for calculating the coefficient and accept the input value. Further, when the number of equations is insufficient and the coefficient cannot be calculated, the coefficient determination unit 12 may perform an output prompting the user to input the insertion amount and the measurement value of another pattern, and accept the input value.

When the coefficients are determined and R _i and L _i are calculated when the squareness after the insertion of the shim is P _x = 0 and P _y = 0, a solution can be obtained by two equations for eight variables. Absent. Therefore, the variable is reduced to 2 or less by adding a condition for limiting the insertion amount of shims.

FIG. 9 is a diagram showing conditions for limiting the insertion amount of the shim when adjusting the squareness according to the present embodiment.
The non-insertion position is determined according to the _squareness measurement values P _x0 and P _y0 before the insertion of the shim, for example, according to each combination of positive and negative, and further, the insertion amount is equal at all insertion positions. Limited to be
At this time, a condition is set so that the shim insertion amount does not become negative in calculation.

Also, if the measured value of the squareness is very large, the amount of insertion of the shim at a specific location may be large. Then, the gap between the column C and the bed B widens, so that rust or deformation occurs over time and the accuracy is likely to deteriorate. Therefore, for example, when the measured value exceeds N, the condition for dispersing the shim insertion positions is applied.
As the value N, a fixed value may be set in advance as a threshold value, or a fixed value may not be set and a calculation procedure for switching the condition when the solution of the equation exceeds a predetermined value may be adopted.

For example, in the above simultaneous equations, the coefficients are K _x1 = 1/10, K _x2 = _2/10 , K _x3 = _3/10 , K _x4 = _4/10 , K _y1 = _4/10 , K _y2 = 8 / When 10, K _y3 = _8/10 , K _y4 = _4/10 and the threshold value of N = 30 μm is set, the insertion amount of the shim is calculated as follows.

When P _x0 = 12 μm and P _y0 = 12 μm, using the conditions R _{1 to 3} = L _{1 to 3} = 0,
_{0 = 12 + (4/10) (} R 4 -L 4)
_{0 = 12- (4/10) (R} 4 + L 4)
Therefore, R ₄ = 0 μm and L ₄ = 30 μm.

For P _x0 = 40 μm and P _y0 = 6 μm, using the conditions L ₁ = L ₂ = L ₃ and R _i = 0,
_{0 = 40 + (6/10) (} 0-L 1) + (4/10) (0-L 4)
_{0 = 6 + (4/10) (} 0 + L 1) - (4/10) (0 + L 4)
Therefore, L _1-3 = 34 μm and L ₄ = 49 μm.

In the case of P _x0 = −4 μm and P _y0 = 20 μm, using the conditions R _{1 to 3} = L _{1 to 3} = 0,
_{0 = -4 + (4/10) (} R 4 -L 4)
_{0 = 20- (4/10) (R} 4 + L 4)
Therefore, R ₄ = 30 μm and L ₄ = 20 μm.

If there are restrictions such as the thickness of the shim that can be inserted is limited to the unit of 10 μm, the approximate value of the solution of the equation may be selected.
Further, depending on the measured values of _squareness P _x0 and P _y0 , it may be possible that a solution of P _x = 0 and P _y = 0 cannot be obtained. In this case, P _x ≈0 and P _y ≈0. May be selected.

Next, the simultaneous equations that define the relationship between the displacement amount related to swirling and the insertion position and insertion amount of the shim will be described.
The error amounts X _l and X _{r in} the X-axis direction after inserting the shim and the error amounts Y _f and Y _{r in the} Y-axis direction are measured values X _lp , X _rp , Y _fp and Y _rp before inserting the shim. On the other hand, it can be defined as follows.
Y _f = Y _fp = 0
X _l = X _r = {(X _lp + X _rp ) − (Y _fp + Y _rp )} / 2
_{X l = X lp -C x (} S t -S b) + C y (B-T) / 2
_{X r = X rp + C x} (S t -S b) + C y (B-T) / 2
_{Y r = Y rp + C y} (B-T)

C _x and C _y are coefficients determined in advance by the coefficient determination unit 12. For example, C _y is determined by inserting a B or T shim and substituting the measured values of swinging before and after insertion into the equation. Then, by inserting a shim of S _t or S _b, C _x is determined by substituting the measured value of swing of the front and rear insertion into the equation.

The method of determining the coefficient is not limited to this. Coefficient determining unit 12, S _{t, S} b, _B, at least one of the values _T, then as well as the equation obtained by substituting the measured values before and after insertion of the shim, by solving a plurality of simultaneous, calculates the coefficients.
The coefficient determination unit 12 may present the user with the preset insertion position of the shim necessary for calculating the coefficient and accept the input value. Further, when the number of equations is insufficient and the coefficient cannot be calculated, the coefficient determination unit 12 may perform an output prompting the input of the insertion amount and the measurement value of another pattern, and may accept the input value.

When B, T, S _t, and S _b are determined when the coefficient is determined and the measured value of swinging after inserting the shim is X ₁ = X _r = Y _r = 0, first, a simultaneous equation is used to calculate B-T. and _S t -S _b is obtained. Furthermore, B, T, S _t, and S _b are determined by adding a condition that limits the insertion amount of shims.

FIG. 10 is a diagram showing conditions for limiting the shim insertion amount when adjusting the swing error amount according to the present embodiment.
Depending on the magnitude relationship between the shim insertion amounts B and T, for example, at least one of B and T is limited to 0.
Similarly, in accordance with the magnitude relationship between the insertion amount S _t and S _b of the shim, for example, at least one of S _t or S _b is limited to 0.

For example, in the above simultaneous equations, when the coefficients are C _x = _3/10 and C _y = 6/10, the shim insertion amount is calculated as follows.

When X _rp = −6 μm, X _lp = 0 μm, Y _fp = 0 μm, and Y _rp = −6 μm,
_{0 = 0- (3/10) (S} t -S b) + (6/10) (B-T) / 2
_{0 = -6 + (3/10) (} S t -S b) + (6/10) (B-T) / 2
0 = -6 + (6/10) (BT)
Therefore, B−T = 10 and S _t −S _b = 10. If the above-mentioned conditions are applied here, S _t = 10 and B = B ₁ = B _r = 10 are obtained.

According to the present embodiment, the accuracy adjusting device 1 adjusts the accuracy between the parts in order to keep the accuracy within a permissible range with respect to the measured value of the predetermined accuracy due to the error in mounting the parts constituting the machine tool. Along with simultaneous equations that define the relationship of the amount of shim to be inserted at each of a plurality of predetermined positions, store the condition that limits at least one of the amount of shims that is the variable of this simultaneous equation, and input the measured value. On the other hand, the simultaneous equations are solved, and the solution satisfying the conditions is output as the insertion amount of the shim.
Therefore, the precision adjusting device 1 can easily output an appropriate adjustment position and adjustment amount by inputting the measurement value of the precision when adjusting the precision of the machine tool.

  Specifically, the accuracy adjusting device 1 can appropriately determine the position and the amount of the shim to be inserted between the column and the bed, for example, when adjusting the squareness of the spindle with respect to the table upper surface in the machine tool. . Further, for example, when adjusting the amount of error in swinging of the spindle in the machine tool, the position and amount of shims to be inserted between the column and the spindle head can be appropriately determined.

  By storing different conditions for each range of measured values, the accuracy adjusting apparatus 1 can suppress inconveniences such as uneven insertion amount of shims and gaps, and can output an appropriate shim arrangement.

  Since the accuracy adjusting device 1 calculates the coefficient of the simultaneous equations by inputting the measured values before and after inserting the shim, it is possible to generate an appropriate expression for each type of machine tool and enhance versatility.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. In addition, the effects described in the present embodiment are merely enumeration of the most suitable effects resulting from the present invention, and the effects according to the present invention are not limited to those described in the present embodiment.

  The accuracy adjusting device 1 may perform the calculation processing of the insertion position and the insertion amount of the shim by batch processing, receives the measurement result of the accuracy each time the machine tool is manufactured, and outputs the calculation result each time. May be.

  The accuracy adjustment device 1 is configured to include both the calculation unit 11 and the coefficient determination unit 12 in the control unit 10, but the present invention is not limited to this, and the function of the coefficient determination unit 12 is different from that of the accuracy adjustment device 1. May be implemented. In this case, the accuracy adjustment device 1 receives the determined coefficient from another device and stores it in the storage unit 20.

  The precision adjusting method by the precision adjusting device 1 is realized by software. When implemented by software, the programs that make up this software are installed in a computer. Further, these programs may be recorded on a removable medium and distributed to users, or may be distributed by being downloaded to a user's computer via a network.

1 Accuracy Adjusting Device 10 Control Unit 11 Computing Unit 12 Coefficient Determining Unit 20 Storage Unit

Claims (7)

In order to keep the accuracy within a permissible range with respect to a measurement value of a predetermined accuracy caused by an error in mounting between parts constituting the machine tool, a shim at each of a plurality of predetermined positions between the parts. With simultaneous equations that define the relationship of the insertion amount of, a storage unit that stores a condition for limiting the insertion amount of the shim that is a variable of the simultaneous equations,
An accuracy adjustment device comprising: a calculation unit that solves the simultaneous equations with respect to the input of the measurement value and outputs a solution that satisfies the condition as an insertion amount of the shim.   The accuracy adjustment device according to claim 1, wherein the storage unit stores a plurality of the conditions according to the range of the measured value.   The accuracy adjustment device according to claim 1 or 2, further comprising: a coefficient determination unit that calculates a coefficient of the simultaneous equations by inputting the insertion amount of the shim and the measured values before and after the insertion of the shim. The accuracy includes the squareness of the spindle with respect to the table upper surface of the machine tool,
The accuracy adjusting device according to any one of claims 1 to 3, wherein the shim for adjusting the perpendicularity is inserted between a column and a bed that configure the machine tool. The accuracy includes an error amount of swinging of the spindle in the machine tool,
The accuracy adjusting device according to any one of claims 1 to 4, wherein the shim for adjusting the error amount of the swinging is inserted between a column forming the machine tool and a spindle head. Computer
In order to keep the accuracy within a permissible range with respect to a measurement value of a predetermined accuracy caused by an error in mounting between parts constituting the machine tool, a shim at each of a plurality of predetermined positions between the parts. With the simultaneous equations that define the relationship of the insertion amount of, stores the condition for limiting the insertion amount of the shim that is a variable of the simultaneous equations,
An accuracy adjusting method for solving the simultaneous equations with respect to the input of the measured value and outputting a solution satisfying the condition as an insertion amount of the shim.   A precision adjustment program for causing a computer to function as the precision adjustment device according to claim 1.

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