KR20180116600A - A method for determination of assembly sequence of elements of multi-axis machine - Google Patents

Abstract

The present invention relates to a method for determining an assembly order of components of a multi-axis machine. The method comprises the steps of: deriving the number of cases in which components of a multi-axis machine can be derived; performing a finite element analysis on the number of the cases based on three-dimensional modeling and confirming a deformation amount of a rail based on an analysis result; calculating a ΔC value and a ΔU value after an assembling process for each step is performed on the deformation amount of the rail; calculating a sum of ΔC value for each step (∑ΔC value) and a sum of ΔU value for each step (∑ΔU value); and determining an assembly order of the components of the multi-axis machine based on the ∑ΔC value and the ∑ΔU value. Therefore, the method can determine the assembly order of the components of the optimized multi-axis machine according to a case while the method corrects a geometrical error of a linear axis of the multi-axis machine.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-

The present invention relates to a method of determining the assembly sequence of components of a multi-axis machining apparatus, and more particularly, to a method of determining the assembly sequence of components of a multi-axis machining apparatus capable of correcting a geometrical error of a linear axis of a multi-

In general, a multi-axis processing machine means a mechanical device including two or more drive shafts, such as a multi-axis machine tool, a multi-axis joint robot, and a CMM.

Such a multi-axis processing machine generally includes at least one linear axis and at least one rotation axis. A typical example is a 5-axis machine tool, that is, a 5-axis machining machine. Usually, a 5-axis machine tool is composed of three linear axes and two rotation axes to perform processing of complex curved surfaces and shapes.

That is, the five-axis machining apparatus has five degrees of freedom in which three rotary feed axes are added to three linear feed axes.

In particular, the two degrees of freedom increased by two feed axes freely implement the posture of the tool, making it possible to easily process complex shapes or free-form surfaces such as reduction of cusp, removal of Un-cut, and over- .

However, due to the assembly error occurring in the vibration and assembly process of the machine itself, there is a physical imperfection between the linear axis and the rotation axis of such a multi-axis processing machine. And geometric errors necessarily exist due to the limitations of assembly.

In particular, the geometrical error of a linear axis due to structural problems is an important factor in determining geometric accuracy.

Therefore, although several methods for correcting such geometrical errors have been proposed, this method is mainly applicable to a method of evaluating and correcting a geometrical error between a linear axis and a rotary axis. In this method, a plurality of linear axes There is no research on how to correct the geometric error.

Korean Patent No. 10-1255479

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of determining the assembling order of components of a multi-axis machining apparatus capable of correcting geometrical errors of a linear axis of a multi-axis machining apparatus.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a method of manufacturing a multi-axis processing machine, comprising the steps of: Performing a finite element analysis on the number of cases based on 3D modeling and confirming a deformation amount of the rail based on the analysis result; Calculating a ΔC value and a ΔU value after the assembling process of each step is performed on the deformation amount of the rail; Calculating a sum (?? C value) of the? C values for each step and a sum (? ?? U value) of the? U values for each step; And determining an assembling order of the components of the multiaxial machining tool based on the ΣΔC value and the ΣΔU value.

Further, the present invention provides a multi-axis processing machine comprising: a T-bed including a first directional bed and a second directional bed disposed in a direction perpendicular to the first directional bed; An X-base disposed on the first directional bed of the T-bed and having an X-axis rail disposed thereon; A table disposed on the X-axis rail; A Y-axis rail disposed at an upper portion of the second directional bed of the T-bed; A column disposed at an upper portion of the Y-axis rail and including a Z-axis rail in a predetermined area of a side surface thereof; And a spindle disposed on the Z-axis rail of the column.

Also, the present invention provides a method of determining the assembling order of components of a multi-axis machine, wherein the amount of deformation of the rails is an amount of deformation of the X-axis rails and the Y-axis rails.

The present invention is characterized in that the ΔC value (Compensable deformation) is a deformation amount that can be corrected between assemblies, and the ΔU value (Unompensable deformation) is a deformation amount that can not be corrected between assemblies. ≪ / RTI >

Also, in the case where a multiaxial machining apparatus optimized for precision is to be manufactured with the maximum error correction, a value of ΣΔC is selected to determine the assembly sequence of the components of the multiaxial machining apparatus, The method comprising:

Also, in the present invention, when a multiaxial machining apparatus is to be manufactured with a minimum machining cost due to error correction, it is preferable to select a value having the smallest value of [Sigma] [Delta] C to arrange the components in the multi- A method of determining the assembling order of components of a multi-axis processing machine to be determined.

Further, in the case of manufacturing a multi-axis machining apparatus considering both the accuracy and the machining cost, the present invention selects a value which is the maximum of the sum of the ΣΔC values and the ΣΔU values to assemble the components of the multi- A method of determining the assembling order of components of a multi-axis processing machine for determining an order is provided.

In the present invention as described above, the number of cases that can occur in the assembly process of the components of the multi-axis processing machine is calculated, and at this time, the order of assembling the components of the optimized multi-axis processing machine is determined through analysis of the deformation amount generated in the assembly process Method can be provided.

Therefore, in the present invention, it is possible to determine the assembling sequence of the components of the optimized multi-axis machine according to the occasion while correcting the geometrical error of the linear axis of the multi-axis machine.

FIG. 2 is a perspective view showing a T-bed according to the present invention, and FIG. 3 is a view showing an X-base including an X-axis rail according to the present invention Fig. 5 is a perspective view showing a state where a table according to the present invention is arranged on an X-base, Fig. 6 is a perspective view showing a column according to the present invention, 8 is a perspective view of a column according to the present invention in which a Y-axis rail is disposed, and FIG. 9 is a perspective view of a Y-axis rail according to the present invention. In which the spindle is disposed on the Z-axis rail of the column.
10 is a flowchart showing a method of determining the assembling sequence of the components of the multi-axis processing machine according to the present invention.
Fig. 11 is a schematic diagram showing the assembling procedure of AS1 to AS3, and Fig. 12 is a schematic diagram showing the assembling procedure of AS4 and AS5.
Figs. 13 to 17 are graphs showing deformation amounts of the rails according to the assembly sequence of AS1 to AS5, respectively.
18 to 22 are tables showing the values of DELTA C and DELTA U according to the assembling sequence of AS1 to AS5, respectively.
FIG. 23 is a table showing the sum (? DELTA C value) of? C values (deformation amounts capable of being corrected between assemblies) in each step in FIG. 18 to FIG. 22, U value (the amount of deformation that can not be corrected between assemblies) (ΣΔU value).

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Is provided to fully convey the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made in detail to the preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings. &Quot; and / or "include each and every combination of one or more of the mentioned items. ≪ RTI ID = 0.0 >

Although the first, second, etc. are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used only to distinguish one component from another. Therefore, it goes without saying that the first component mentioned below may be the second component within the technical scope of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. The terms " comprises "and / or" comprising "used in the specification do not exclude the presence or addition of one or more other elements in addition to the stated element.

Unless defined otherwise, all terms (including technical and scientific terms) used herein may be used in a sense commonly understood by one of ordinary skill in the art to which this invention belongs. Also, commonly used predefined terms are not ideally or excessively interpreted unless explicitly defined otherwise.

The terms spatially relative, "below", "beneath", "lower", "above", "upper" And can be used to easily describe a correlation between an element and other elements. Spatially relative terms should be understood in terms of the directions shown in the drawings, including the different directions of components at the time of use or operation. For example, when inverting an element shown in the figures, an element described as "below" or "beneath" of another element may be placed "above" another element . Thus, the exemplary term "below" can include both downward and upward directions. The components can also be oriented in different directions, so that spatially relative terms can be interpreted according to orientation.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 2 is a perspective view showing a T-bed according to the present invention, and FIG. 3 is a view showing an X-base including an X-axis rail according to the present invention Fig. 5 is a perspective view showing a state where a table according to the present invention is arranged on an X-base, Fig. 6 is a perspective view showing a column according to the present invention, 8 is a perspective view of a column according to the present invention in which a Y-axis rail is disposed, and FIG. 9 is a perspective view of a Y-axis rail according to the present invention. In which the spindle is disposed on the Z-axis rail of the column.

1 and 2, a multi-axis processing machine according to the present invention, for example, a five-axis processing machine 100 includes a T-bed 110, and the T- And includes a one-way bed 110a and a second directional bed 110b disposed in a direction perpendicular to the first directional bed 110b.

1 and 3, a five-axis processing machine 100 according to the present invention includes an X-base 120 (see FIG. 1) disposed on the first directional bed 110a of the T-bed 110, Base 120 includes an X-axis rail 121 disposed at an upper portion of the X-base 120. The X-

The X-axis rail 121 includes an X-axis first rail 121a and an X-axis second rail 121b disposed in parallel with the X-axis first rail 121a.

For convenience of explanation, the X-axis first rail 121a is defined as a front rail, and the X-axis second rail 121b is defined as a back rail.

1, 4 and 5, a five-axis machining apparatus 100 according to the present invention includes a table 130 disposed on the X-axis rail 121, and the table 130 Includes a support plate 131 for positioning the object to be processed.

At this time, the table 130 is disposed on the X-axis rail 121 and can move in the X-axis direction.

1, 6, and 7, the five-axis processing machine 100 according to the present invention includes a column (not shown) disposed on the upper portion of the second directional bed 110b of the T- 140, and a Y-axis rail 111 is disposed at a lower portion of the column 140.

The Y-axis rail 111 includes a Y-axis first rail 111a and a Y-axis second rail 111b disposed in parallel with the Y-axis first rail 111a.

However, for convenience of explanation, the Y-axis first rail 111a is defined as a left rail, and the Y-axis second rail 111b is defined as a right rail.

7, the Y-axis rail 111 is disposed on the second directional bed 110b of the T-bed 110, and the Y-directional rail 111 is disposed on the second directional bed 110b of the T- Axis column 111, and the column 140 is disposed above the Y-axis rail 111. [0034] As shown in FIG.

At this time, the column 140 is disposed on the Y-axis rail 111 and can move in the Y-axis direction.

1, 6, and 7, a Z-axis rail 141 is included in a certain region of the side surface of the column 141. In addition,

At this time, the Z-axis rail 141 includes a Z-axis first rail 141a and a Z-axis second rail 141b disposed in parallel with the Z-axis first rail 141a.

1, 8 and 9, a five-axis machining apparatus 100 according to the present invention includes a spindle 150 disposed on the Z-axis rail 141 of the column 140 At this time, the spindle 150 can move in the Z-axis direction.

Meanwhile, as described above, such a multiaxial machining apparatus requires a high level of machining accuracy, but geometrical errors of a linear axis due to an assembly error and a structural problem arise in the vibration and assembly process of the machine itself.

In this case, an error of a linear axis occurs depending on the self-weight of each structure. In particular, an error of a linear axis of the X-axis rail 121 and the Y-axis rail 111 becomes a problem.

Therefore, in the present invention, the number of cases that can occur in the assembling process of the components of the multiaxial machining apparatus is calculated by using a finite element method (FEM). At this time, by analyzing the amount of deformation occurring in the assembling process, To provide a method for determining the assembly sequence of components of the system.

10 is a flowchart showing a method of determining the assembling sequence of the components of the multi-axis processing machine according to the present invention.

Referring to Fig. 10, a method of determining the assembling sequence of the components of the multi-axis machining apparatus according to the present invention includes deriving the number of cases in which the components of the multi-axis machining apparatus can be derived (S100).

As described above, the multi-axis processing machine according to the present invention can include components of T-bed B, X-base X, table T, column C and spindle S.

At this time, the number of cases in which the components of the multi-axis processing machine can be derived in the present invention is shown in Table 1 below.

In the following Table 1, column (C) + spindle (S) refers to the case where the column (C) is assembled in a state where the spindle (C) is already mounted on the column (C), AS means Assemble Sequence do.

Stage AS1 AS2 AS3 AS4 AS5 1st T-bed (B) T-bed (B) T-bed (B) T-bed (B) T-bed (B) 2nd X-base (X) X-base (X) X-base (X) X-base (X) X-base (X) 3rd Table (T) Column (C) Column (C) Table (T) Column (C) +
The spindle (S) 4th Column (C) The spindle (S) Table (T) Column (C) +
The spindle (S) Table (T) 5th The spindle (S) Table (T) The spindle (S) - -

The assembly procedure according to Table 1 is expressed in the following manner.

Fig. 11 is a schematic diagram showing the assembling procedure of AS1 to AS3, and Fig. 12 is a schematic diagram showing the assembling procedure of AS4 and AS5.

As can be seen from FIG. 11, the assembling sequence of AS1 to AS3 can be divided into five steps. As can be seen from FIG. 12, AS4 and AS5 can be divided into four stages.

10, a method for determining the assembling sequence of the components of the multiaxial machining apparatus according to the present invention is characterized by performing a finite element analysis on the basis of 3D modeling for each case, And checking the amount of deformation of the rail (S110).

Figs. 13 to 17 are graphs showing deformation amounts of the rails according to the assembly sequence of AS1 to AS5, respectively.

In this case, in the present invention, a linear axis error occurs depending on the self-weight of each structure. In particular, an error of a linear axis of the X-axis rail 121 and the Y-axis rail 111 becomes a problem.

13 to 17 show the amount of deformation of the X-axis rail 121 and the Y-axis rail 111. As described above, the X-axis first rail 121a is connected to the front rail Axis second rail 121b is defined as a back rail and the Y-axis first rail 111a is defined as a left rail and the Y-axis second rail 111b is defined as a left rail. Is defined as a right rail.

On the other hand, the amount of deformation of the rails in Figs. 13 to 17 was confirmed by the structural analysis using the ANSYS Workbench finite element analysis program.

For example, referring to FIG. 13, a front rail, a back rail, a left rail, and a left rail are formed in the assembling sequence of the AS1, ) Rail and the right rail.

However, the deformation amounts in Figs. 13 to 17 correspond to exemplary values, and the present invention is not limited to the deformation amounts in Figs.

10, a method of determining the assembling order of the components of the multi-axis processing machine according to the present invention includes determining ΔC values after the assembling process of each step for each deformation amount of the rails ) And a DELTA U value (deformation amount that can not be corrected between assemblies) (S120).

△ C value and △ U value are classified according to the presence or absence of conveying body on the rail.

For example, if the x-base is installed on the bed in stage 2 of the assembly, the deformation of the rail can be viewed as a ΔC value since there is no carrier on the rail.

However, if the table is installed on the x-base in Step 3, the correction of the rail becomes difficult.

The ΔC value and the ΔU value are derived from the graph of each step in FIG. 13, based on the difference between the maximum value and the minimum value of the graph, and the relative deformation is derived and the sum of the relative deformation of each rail is derived.

For example, the amount of deformation generated in the first stage of assembly is corrected in the first stage of assembly, and the deformation amount generated in the second stage of assembly is a deformation value including deformation in the first stage, The deformation sum of each rail except for the deformation of the first stage of assembly is a value of? C or? U.

The residual ΔC value and ΔU value can also be derived as described above.

18 to 22 are tables showing the values of DELTA C and DELTA U according to the assembling sequence of AS1 to AS5, respectively.

Referring to Fig. 18, the ΔC value in the first step (1st) in AS1 is 19.720, and the ΔU value corresponds to zero.

Further, the ΔC value in the third step (3rd) in S1 is 2.186 and the ΔU value is 6.437.

For example, in a state in which only the T-bed is placed in the first stage (1st) in AS1, the deformation amount of the T-bed due to the self-load of the T-bed can be corrected, the amount of deformation of the T-bed, the amount of deformation of the front rail and the back rail disposed on the X-base, the amount of deformation of the left rail and the right rail disposed on the T- Since all of the deformation due to the remaining components can be corrected, the value of? U (the uncompensable deformation) is equal to zero.

Alternatively, for example, assuming that the table is placed on the front rail and the back rail and the columns are not disposed on the left rail and the right rail, And the table is arranged on the back rail, the deformation amount of the front rail and the back rail can no longer be corrected.

Therefore, the amount of deformation of the front rail and the back rail corresponds to the UU value (uncompensable deformation) between the assemblies. However, Since the amount of deformation of the rail can be corrected, the amount of deformation of the left rail and the right rail may correspond to the ΔC value (the amount of deformation that can be corrected between assemblies).

However, the values of DELTA C and DELTA U in Figs. 18 to 22 correspond to exemplary values, and the present invention is not limited to DELTA C values and DELTA U values in Figs.

10, the method of determining the assembling sequence of the components of the multiaxial machining apparatus according to the present invention includes a total sum (ΣΔC value) of ΔC values (amounts of deformation that can be corrected between assemblies) (? UU value) of? U values (deformation amounts that can not be corrected between assemblies) (S130).

FIG. 23 is a table showing the sum (? DELTA C value) of? C values (deformation amounts capable of being corrected between assemblies) in each step in FIG. 18 to FIG. 22, U value (the amount of deformation that can not be corrected between assemblies) (ΣΔU value).

As can be seen from FIG. 23, the minimum value of the total sum (ΣΔC value) of ΔC values (the amount of deformation that can be corrected between assemblies) in each step is 29.064, which is the minimum value in the case of AS1 and AS4, 24, it can be confirmed that the minimum value of the sum (ΣΔU value) of ΔU values (deformation amounts that can not be corrected between assemblies) in each step is the minimum value in the case of AS5.

However, ΣΔC and ΣΔU in FIGS. 23 and 24 correspond to exemplary values, and the present invention is not limited to ΣΔC and ΣΔU in FIGS. 23 and 24.

10, a method of determining the assembling sequence of the components of the multi-axis machine according to the present invention determines the assembling sequence of the components of the multi-axis machine on the basis of the ΣΔC value and the ΣΔU value (S140).

For example, in correcting errors in the linear axes of the X-axis rails 121 and the Y-axis rails 111 of the multi-axis machine, first, there is a case where a multi- Secondly, there will be a case where a multi-axis machining apparatus is manufactured with a minimum machining cost due to error correction although the accuracy is low. On the other hand, third, there is a possibility that both precision and machining cost There will be a case where a multi-axis processing machine is considered.

In the present invention, it is possible to determine the assembling order of the components of the optimized multi-axis processing machine according to the various cases.

For example, in the case of the first case, that is, in order to manufacture a multi-axis machining apparatus optimized for precision, the assembly order of the components of the multi-axis machining apparatus can be determined by selecting a value having the largest value of? C, The assembling sequence of the components of the multi-axis processing machine according to the AS2 assembling process can be determined.

In the second case, that is, when a multiaxial machining apparatus optimized for the machining cost is to be manufactured, the assembly sequence of the components of the multiaxial machining apparatus can be determined by selecting a value having the smallest value of the value of [Delta] C, Or the assembling sequence of the components of the multi-axis processing machine according to the assembling process of the AS2.

In the case of the third case, that is, when a multiaxial machining apparatus is to be manufactured in consideration of both the precision and the machining cost, the value of the sum of the ΣΔC value and the sum of the ΣΔU values is selected to assemble the components of the multi- In this case, the assembling sequence of the components of the multi-axis processing machine according to the assembling process of the AS1 can be determined.

However, as described above, it is not limited to the selection of the assembling process according to the first to third cases of the present invention, which corresponds to an example of the values of ΣΔC and ΣΔU.

As described above, in the present invention, the number of cases that can occur in the assembling process of the components of the multi-axis processing machine is calculated, and the order of assembling the components of the optimized multi-axis processing machine is determined Can be provided.

That is, in the present invention, it is possible to determine the assembling order of the components of the optimized multi-axis processing machine according to the occasion while correcting the geometrical error of the linear axis of the multi-axis processing machine.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

Claims (7)

Deriving the number of cases in which the components of the multi-axis processing machine can be derived;
Performing a finite element analysis on the number of cases based on 3D modeling and confirming a deformation amount of the rail based on the analysis result;
Calculating a ΔC value and a ΔU value after the assembling process of each step is performed on the deformation amount of the rail;
Calculating a sum (?? C value) of the? C values for each step and a sum (? ?? U value) of the? U values for each step; And
And determining the assembling order of the components of the multiaxial machining tool on the basis of the ΣΔC value and the ΣΔU value. The method according to claim 1,
The multi-
A T-bed comprising a first directional bed and a second directional bed disposed in a direction perpendicular to the first directional bed;
An X-base disposed on the first directional bed of the T-bed and having an X-axis rail disposed thereon;
A table disposed on the X-axis rail;
A Y-axis rail disposed at an upper portion of the second directional bed of the T-bed;
A column disposed at an upper portion of the Y-axis rail and including a Z-axis rail in a predetermined area of a side surface thereof; And
And a spindle disposed on the Z-axis rail of the column. 3. The method of claim 2,
Wherein the amount of deformation of the rail is an amount of deformation of the X-axis rail and the Y-axis rail. The method of claim 3,
Wherein the ΔC value (Compensable deformation) is a deformation amount that can be corrected between assemblies, and the ΔU value (Unompensable deformation) is a deformation amount that can not be corrected between assemblies. 3. The method of claim 2,
To determine the assembling sequence of the components of the multi-axis machining apparatus to determine the assembly sequence of the components of the multi-axis machining apparatus by selecting a value having the largest value of? C, in order to manufacture a multi-axis machining apparatus optimized for accuracy with the maximum error correction . 6. The method of claim 5,
In order to manufacture a multi-axis machining apparatus with a minimum machining cost due to error correction, a multi-axis machining apparatus for selecting a value having the smallest value of the & cir & How to determine the assembly sequence of components. The method according to claim 6,
Axis direction in which the sum of the sum of the sum of the sum of [Delta] C and the sum of [sum] [Delta] U is a maximum value to determine the assembling order of the components of the multi- A method for determining the assembly order of components of a machine.

Images