KR20180078526A - Actuator Driving Type 3 dimensional Measuring Apparatus using Self-centering Unit - Google Patents

Abstract

The present invention provides an actuator-driven apparatus for measuring three axial dimensions by using a self-centering unit, capable of rapidly and accurately measuring precise dimensions of a three-dimensional machining surface. The actuator-driven apparatus for measuring the three axial dimensions by using the self-centering unit includes: a base part to which a workpiece having a three-dimensional machining surface, which is an inspection target, is fixed; the self-centering unit including a measurement probe for measuring dimensions of the three-dimensional machining surface; and an actuator unit for operating the self-centering unit, wherein the self-centering unit includes: the measurement probe having a shape in which one end of the measurement probe is matched to the three-dimensional machining surface to measure the dimensions of the three-dimensional machining surface; and a three axial displacement measurement unit having one side coupled to the actuator unit and having an opposite side coupled to the measurement probe to measure a displacement amount in each of three axial directions while generating a displacement in the three axial directions according to movement of the measurement probe in a process in which one end of the measurement probe is matched to the three-dimensional machining surface by an operation of the actuator unit.

Description

[0001] The present invention relates to an actuator-driven three-axis dimension measuring apparatus using a self-centering unit,

The present invention relates to an actuator-driven three-axis dimension measuring apparatus using a self-centering unit, and more particularly, to a self-centering unit in which a dimension measuring probe is automatically formed by a self-centering unit connected to the actuator when the actuator is operated, Axis direction displacement of the probe for dimensional measurement generated in the matching process and can be simultaneously measured to determine whether or not the three-dimensional machining surface is defective with respect to the three-axis direction dimensions, The present invention relates to a three-axis dimension measuring apparatus of an actuator driving type that uses a self-centering unit for quickly and accurately measuring a precise dimension of a three-dimensional shaped work surface machined by a machining apparatus such as an MCT.

A machining center (MCT) is a machine tool for machining a workpiece by automatically replacing the continuous work of several processes by attaching an automatic tool changer, It is a machine for machining a workpiece through water command etc. Currently, the spread of 3-axis machining is active, and precision machining machines such as 4-axis machining and 5-axis machining are also developed, distributed and manufactured.

These MCTs are used for machining various kinds of automobile parts and electric / electronic parts such as clutch parts, compressor parts, steering parts, etc. In particular, the machined surfaces of three-dimensional shapes such as curved surfaces are combined with other parts It is necessary to perform a defect inspection process for inspecting whether or not the three-dimensional machined surface has been normally processed.

Conventionally, in order to minimize the occurrence of inspection loss due to the production cycle of production parts and the asymmetry of the inspection cycle, the defect inspection process has been mainly performed by a sampling inspection method. However, due to the nature of the sampling method, There is a problem in that a large number of defects of lot are generated rather than a small number of product defects even if it is detected, resulting in loss of the enterprise due to production stoppage and reproduction.

Therefore, in recent years, the total inspection of the total dimension of the work to be processed by the dedicated inspection apparatus is mainly performed on all the workpieces produced in the factory. The detailed configuration of such a dedicated inspection apparatus is described in detail in the following document 1 .

However, in the case of the inspection apparatus according to the following [1], there is a disadvantage that it can not be applied to dimensional inspection of a three-dimensional work surface because it is an apparatus for inspecting a defect of a tapped work with respect to a workpiece.

In order to compensate for this, recently, there has been proposed an optical method using a camera or a method of measuring the displacement of a probe tip moving along a machining plane to measure the precision of a three-dimensional machined surface. However, In addition, in the latter case, it takes a long time to measure the dimension, which causes a problem of deteriorating the productivity.

[Patent Document 1] Korean Patent No. 10-0728092 (disclosed on April 9, 2007)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a self-centering unit, which, when operating an actuator, automatically aligns the measuring probe with a three-dimensional work surface by means of a self-centering unit connected to the actuator Axis direction displacement of the probe for dimension measurement generated in the matching process, it is possible to simultaneously measure whether or not the three-dimensional machining surface is defective with respect to the three-axis direction dimensions, A three-axis dimension measuring device of an actuator driving type using a self-centering unit for quickly and accurately measuring a precision dimension of a three-dimensional machined surface machined using the same machining apparatus.

In order to achieve the above object, an actuator-driven three-axis dimension measuring apparatus using a self-centering unit according to the present invention includes a base portion to which a workpiece having a three-dimensional machining surface to be inspected is fixed, A self-centering unit including a measuring probe for measuring a dimension, and an actuator unit for operating the self-centering unit, wherein the self-centering unit comprises: Wherein the measuring probe has a shape that is matched with the dimension machining surface, the actuator part is coupled to one side and the measuring probe is coupled to the other side, and one end of the measuring probe is moved to the three- In accordance with the movement of the measuring probe, While the displacement of the generated characterized in that it comprises a triaxial displacement measurement for measuring each of the three axial displacement.

The actuator part moves the measuring probe in a first direction that is the direction toward the three-dimensional machining surface, and the measuring probe moves the one end of the measuring probe along the three-dimensional machined surface shape by the driving part of the actuator, Dimensional machining surface.

The three-axis displacement measuring unit may include a first displacement module, one side of which is coupled to the actuator unit and moves in the first direction by the actuator unit, a first displacement module that is movable in the second direction perpendicular to the first direction, A second displacement module coupled to one side of the displacement module, a third displacement module coupled to one side of the second displacement module to be movable in a third direction perpendicular to the first direction and the second direction, Axis displacement measuring module for measuring a displacement amount of the first, second and third displacement modules installed on at least one of the first, second and third displacement modules, And a failure judgment module for judging the failure.

In an actuator-driven 3-axis dimension measuring apparatus using a self-centering unit according to the present invention, when an actuator is operated, a dimensioning probe is automatically matched to a three-dimensional work surface by a self-centering unit connected to the actuator, The three-dimensional displacement of the probe for dimension measurement generated in the matching process is automatically measured. Thus, it is possible to simultaneously measure whether or not the three-dimensional machining surface is defective with respect to the three-axis direction dimensions. There is an advantage that it is possible to quickly and accurately measure the precise dimensions of the machined surface of the three-dimensional shape processed by the machining apparatus.

FIG. 1 is a perspective view for explaining a configuration of an actuator-driven 3-axis dimension measuring apparatus using a self-centering unit according to an embodiment of the present invention,
Figs. 2 to 4 are sectional views of the AA portion, the BB portion, and the CC portion, respectively, of Fig.

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

FIG. 1 is a perspective view for explaining a configuration of an actuator-driven three-axis dimension measuring apparatus using a self-centering unit according to an embodiment of the present invention, and FIGS. And a CC portion.

An actuator-driven 3-axis dimension measuring apparatus using a self-centering unit according to the present invention includes a base portion 10 to which a workpiece 20 having a three-dimensional machining surface 21 to be inspected is fixed, Centering unit (40, 50, 51, 52, 53) including a measuring probe (50) for measuring the dimension of the self-centering unit (21), and an actuator unit .

At this time, the self-centering unit includes a measuring probe 50 having a shape in which one end of the three-dimensional machining surface 21 is matched with the three-dimensional machining surface 21, The measuring probe 30 is coupled to the measuring probe 50 and the measuring probe 50 is coupled to the measuring probe 50. One end of the measuring probe 50 is aligned with the three- Axis displacement measuring unit (40, 51, 52, 53) for measuring the amount of displacement in each of the three axial directions while generating displacement in the three axial directions in accordance with the movement of the measuring probe in the course of the measurement.

In this embodiment, the workpiece 20 is fixed to the base portion 10 such that the work surface to be inspected is directed upward. To this end, the base portion 10 is provided with a pair 12 of the fixing jigs 11, 12 are provided.

The measuring probe 50 is formed in a bar shape perpendicular to the upper surface of the base unit 10. In the present embodiment, And moves in a first direction perpendicular to the upper surface of the base portion 10 by operation.

In addition, the actuator 30 is configured such that the end coupled to the three-axis direction displacement measuring units 40, 51, 52, and 53 can move up and down in the first direction. In the present embodiment, May be suitably configured using a normal hydraulic cylinder, an electric cylinder, or the like.

The three-axis displacement measuring unit 40, 51, 52, and 53 may include a first displacement module 40, one end of which is coupled to the end of the actuator unit 30 and moves in the first direction by the actuator unit 30, (41), a second displacement module (42) coupled to one side of the first displacement module (41) so as to be movable in a second direction perpendicular to the first direction, a second displacement module A third displacement module 43 coupled to one side of the second displacement module 42 so as to be movable in a third direction and a third displacement module 43 coupled to one side of the three axis displacement measurement unit 40, 51, 52, And a three-axis displacement measurement module (51, 52, 53) installed in at least one of the first, second and third displacement modules (41, 42, 43).

In this case, the first displacement module 41 may have a substantially U-shaped configuration in which the legs are extended in the first direction on both sides of the flat plate coupled to the end of the actuator 30, .

The first displacement module 41 is configured to move up and down along the first direction together with the measuring probe 50 in conjunction with the elevation of the actuator.

4, a pair of first guide rails 41a for guiding the second displacement module 42 to move along the second direction are disposed in the legs of both sides of the first displacement module 41, Is formed.

The second displacement module 42 is formed in a flat plate shape in which both ends of the second displacement module 42 are coupled to the inner side surfaces of both legs of the first displacement module 41. For this purpose, And first guide rollers 42b coupled to the first guide rails 41a formed on both legs of the first displacement module 41 are provided at both ends of the guide rail 42. [

According to the above-described configuration, the second displacement module 42 can be moved in the second direction according to the displacement in the second direction generated when the end of the measurement probe 50 contacts the three-dimensional processing surface 21 The first guide roller 42b is rotated along the guide rail 41a to generate displacement.

The third displacement module 43 is formed in a flat plate shape in which the upper surface of the third displacement module 43 is coupled to the lower surface of the second displacement module 42. For this purpose, A second guide roller 43b coupled to a second guide rail 42a formed on a lower surface of the second displacement module 41 is installed on the upper surface of the second displacement module 41. [

According to the above-described configuration, the third displacement module 43 can move the third probe 42 in the second direction in accordance with the displacement in the third direction generated when the end of the measuring probe 50 contacts the three- The second guide roller 43b is rotated along the guide rail 42a to generate displacement.

The first, second and third displacement modules 41, 42, and 43 are configured such that when the end of the measurement probe 50 contacts the three-dimensional processing surface 21 by the actuator 30, The displacement in the first direction, the second direction, and the third direction are generated by the driving force of the measuring probe 30 and the restraining force by the combination of the end of the measuring probe 50 and the three-dimensional machining surface 21 .

At this time, when the three-dimensional machined surface is a curved surface such as a hemispherical groove as in the present embodiment, the end of the measuring probe protruding in a curved shape corresponding to the three-dimensional machined surface is deformed by the machining error of the workpiece, (The hemispherical groove in the present embodiment), it is naturally slid into the curved groove due to the driving force of the actuator 30, and in this process, the first, second and third displacement modules 41 , 42 and 43 cause the displacement in the three axial directions in accordance with the above-described machining error.

The displacements of the first, second and third displacement modules 41, 42, and 43 in the three axial directions are measured by the three-axis displacement measurement modules 51, 52 and 53. In this embodiment, The three-axis displacement measurement modules 51, 52 and 53 include a first direction displacement measurement module 51 installed on the upper surface of the base unit 10, a first displacement measurement module 51 installed on one side of the inner sides of the legs of the first displacement module 41, A two-way displacement measurement module 52, and a third direction displacement measurement module 53 installed on one side of the lower surface of the second displacement module 42.

In this case, the three-axis displacement measurement module 51, 52, 53 may be configured using any one of known sensors capable of measuring the displacement of an object. In this embodiment, The measurement modules 51, 52 and 53 are constituted by an LVDT sensor having high measurement accuracy.

Therefore, the displacement of the first, second and third displacement modules 41, 42, 43 caused by the machining error of the three-dimensional machined surface 21 in the three axial directions is measured as described above, (Not shown) with a predetermined reference value to determine the defective dimension in the three-axis direction dimension.

In this case, it is preferable that the reference value is set to a dimension range in consideration of the tolerance range with respect to the three-axis direction dimension.

Claims (3)

A base portion to which a workpiece having a three-dimensional machining surface to be inspected is fixed;
A self-centering unit including a measuring probe for measuring the dimension of the three-dimensional machining surface; And
And an actuator unit for operating the self-centering unit,
Wherein the self-centering unit comprises: a measuring probe having a shape in which one end of the three-dimensional machining surface is matched to the three-dimensional machining surface for dimension measurement; And a displacement amount in each of the three axial directions is generated while causing one end of the measuring probe to be aligned with the three-dimensional machined surface in accordance with the movement of the measuring probe by the operation of the actuator, Axis displacement measuring unit for measuring the three-axis displacement of the actuator. The method according to claim 1,
Wherein the actuator moves the measuring probe in a first direction that is a direction toward the three-dimensional processing surface,
Wherein the measuring probe is aligned with the three-dimensional machining surface while the one end of the measuring probe moves along the three-dimensional machining surface shape by the actuator of the actuator. 3. The method of claim 2,
Wherein the three-axis displacement measuring unit comprises:
A first displacement module having one side coupled to the actuator unit and moving in the first direction by the actuator unit;
A second displacement module coupled to one side of the first displacement module to be movable in a second direction perpendicular to the first direction;
A third displacement module coupled to one side of the second displacement module so as to be movable in a third direction perpendicular to the first direction and the second direction;
A three-axis displacement measuring module installed in at least one of the three-axis displacement measuring unit and the base unit for measuring a displacement amount of the first, second and third displacement modules; And
And a failure determination module that determines a defective dimension by comparing the measurement result of the three-axis displacement measurement module with a predetermined reference value. The apparatus of claim 1, wherein the three-axis displacement measurement module comprises:

Images