KR101795178B1 - Test bar and installation method for ball screw support bearing unit using the same - Google Patents

Test bar and installation method for ball screw support bearing unit using the same Download PDF

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Publication number
KR101795178B1
KR101795178B1 KR1020150175960A KR20150175960A KR101795178B1 KR 101795178 B1 KR101795178 B1 KR 101795178B1 KR 1020150175960 A KR1020150175960 A KR 1020150175960A KR 20150175960 A KR20150175960 A KR 20150175960A KR 101795178 B1 KR101795178 B1 KR 101795178B1
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KR
South Korea
Prior art keywords
bearing
bearing unit
test bar
retainer
ball screw
Prior art date
Application number
KR1020150175960A
Other languages
Korean (ko)
Other versions
KR20170068911A (en
Inventor
이지호
Original Assignee
현대위아 주식회사
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Priority to KR1020150175960A priority Critical patent/KR101795178B1/en
Publication of KR20170068911A publication Critical patent/KR20170068911A/en
Application granted granted Critical
Publication of KR101795178B1 publication Critical patent/KR101795178B1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P19/00—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes
    • B23P19/02—Machines for simply fitting together or separating metal parts or objects, or metal and non-metal parts, whether or not involving some deformation; Tools or devices therefor so far as not provided for in other classes for connecting objects by press fit or for detaching same
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/061—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing mounting a plurality of bearings side by side
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/067—Fixing them in a housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/2018—Screw mechanisms with both screw and nut being driven, i.e. screw and nut are both rotating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/22—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members
    • F16H25/2204—Screw mechanisms with balls, rollers, or similar members between the co-operating parts; Elements essential to the use of such members with balls
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B3/00—Measuring instruments characterised by the use of mechanical techniques
    • G01B3/22—Feeler-pin gauges, e.g. dial gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/24—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes
    • G01B5/25—Measuring arrangements characterised by the use of mechanical techniques for measuring angles or tapers; for testing the alignment of axes for testing the alignment of axes

Abstract

The present invention relates to a test bar used for checking whether a bearing unit supporting a ball screw is disposed at a predetermined position in a frame supporting the bearing unit, and a method of installing a bearing unit for supporting the ball screw, The bar includes a degree-of-measurement measuring section formed in the axial direction and measurable by an accuracy measuring instrument; And a support portion extending from the accuracy measuring portion along the axial direction and supported by the bearing unit, wherein the support portion is inserted into the bearing of the bearing unit and rotatably supported. Thereby, the same test bar can be fastened to various bearing units, the versatility of the test bar can be improved, and the cost required for manufacturing and storing the test bar can be reduced. Further, since the support structure between the test bar and the bearing unit is formed in the same structure as the support structure between the ball screw and the bearing unit, the bearing unit is installed in the frame at a predetermined position, and the ball screw When installed, the degree of ball screw may be included in a predetermined range.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a test bar and a bearing unit for supporting a ball screw using the test bar,

The present invention relates to a test bar and a method of installing a bearing unit for supporting a ball screw using the test bar. More particularly, the present invention relates to a bearing unit for supporting a ball screw, And a method of mounting a bearing unit for supporting a ball screw using the test bar.

In general, a machine tool is a machine used for machining a metal or non-metal material (hereinafter referred to as "base material") into various shapes or sizes by using various cutting or non-cutting processing methods, or for adding more precise machining It says.

The machine tool is classified into a cutting machine tool in which chips are generated during machining and a non-cutting machine tool (metal working machine) in which chips are not generated during machining. The cutting machine tool includes a lathe, a milling machine, a machining center, a drilling machine, a boring machine, a grinding machine, a gear processing machine, and a special processing machine. The non-cutting machine tool includes a mechanical press, a hydraulic press, It has an early stage and a drawing machine.

The cutting machine tool (hereinafter referred to as a machine tool) typically includes a frame, a bearing unit provided on the frame, a ball screw rotatably supported on the bearing unit, a motor for rotating the ball screw, And a nut block for transferring the object to be transferred (for example, a workpiece) while being reciprocated by rotation of the ball screw.

Here, the bearing unit is installed at a predetermined position in the frame with equipment such as a test bar to improve the accuracy of the ball screw.

2 is a side view of FIG. 1, FIG. 3 is a front view showing a conventional second test bar, FIG. 4 is a side view of FIG. 3, and FIG. 5 is a side view of the conventional test bar. 1 and FIG. 2, and FIG. 6 is a cross-sectional view showing a state where the ball screw is fastened to the bearing unit in which the installation is completed.

1 to 6, the bearing unit 2000 is arranged at a predetermined position in the frame 1000 by the test bar 7000 and is then fixed to the frame 1000, and the frame 1000 Is fixed to the ball screw 3000 after the test bar 7000 is detached.

6, the bearing unit 2000 includes a first bearing unit 2100 for supporting one end of the ball screw 3000 and a second bearing unit 2100 for supporting the other end of the ball screw 3000. [ And a bearing unit 2200.

Here, the bearing unit 2000 is formed to support both ends of the ball screw 3000. When a plurality of the ball screws 3000 are provided, for example, as a machining center, The number of which is the same as the number of the ball screws 3000.

The first bearing unit 2100 includes a first housing 2110 which is seated on the frame 1000 and has a first shaft hand hole 2112 through which one end of the ball screw 3000 passes, A first bearing 2120 interposed between the first bearing 2120 and one end of the ball screw 3000 and a first retainer 2130 supporting the first bearing 2120 in the axial direction of the first bearing 2120. [ And a first lock nut (not shown) coupled to the ball screw 3000 on the opposite side of the first bearing 2120 with respect to the first retainer 2130 and supporting the first retainer 2130 2140).

The second bearing unit 2200 includes a second housing 2210 having a second shaft hole 2212 which is seated on the frame 1000 and through which the other end of the ball screw 3000 passes, A second bearing 2220 interposed between the hand hole 2212 and the other end of the ball screw 3000 and a second retainer 2220 supporting the second bearing 2220 in the axial direction of the second bearing 2220 A second fixing nut 2240 fastened to the ball screw 3000 and supporting the second retainer 2230 on the opposite side of the second bearing 2220 with respect to the second retainer 2230, .

The first bearing unit 2100 and the second bearing unit 2200 having such a configuration are respectively fixed to the frame 1000 before being coupled to the ball screw 3000. The first bearing unit 2100, Is fixed to the frame 1000 as shown in Fig. 5 by the first test bar 7100 shown in Figs. 1 and 2, and is fixed, and the second bearing unit 2200 is fixed to the frame 1000 as shown in Figs. 3 and 4 Is positioned and fixed in the frame 1000 as shown in FIG. 5 by a second test bar 7200 shown in FIG.

The first test bar 7100 includes a first degree-of-detail measuring portion 7110 extending in the axial direction and measurable by an accuracy measuring instrument, and a second degree-of-inclination measuring portion 7110. The first degree- And a first fastening part 7120 extended from the first housing 2110 and fastened to the first housing 2110.

The first fastening part 7120 is fastened to the first housing 2110 by a plurality of first test bar fastening members B3 penetrating the first fastening part 7120 and fastened to the first housing 2110, . At this time, the first bearing 2120, the first retainer 2130, and the first fixing nut 2140 are detached from the first bearing unit 2100 so as not to interfere with the first test bar 7100 .

The second test bar 7200 includes a second accuracy measuring unit 7210 extending in the axial direction and measurable by a precision measuring device, and a second accuracy measuring unit 7210 extending from the second accuracy measuring unit 7210 along the axial direction And a second fastening part 7220 fastened to the second housing 2210.

The second fastening part 7220 is fastened to the second housing 2210 by a plurality of second test bar fastening members B4 penetrating the second fastening part 7220 and fastened to the second housing 2210, . At this time, the second bearing 2220, the second retainer 2230, and the second fixing nut 2240 are detached from the second bearing unit 2200 so as not to interfere with the second test bar 7200 .

The first housing 2110 has a shape different from that of the second housing 2210 and is connected between the first housing 2110 and the second housing 2210. The first housing 2110 has a shape different from that of the second housing 2210, And the first test bar 7100 is different from the PCD between the fastening holes of the second housing 2210 fastened to the second test bar fastening member B4 by the first housing 2110 The second test bar 7200 can be fastened only to the second housing 2210 and can be fastened to the first housing 2110 only Can not be concluded. Accordingly, the first test bar 7100 and the second test bar 7200 are separately provided.

According to this configuration, the first housing 2110 is fastened to the first housing fastening member B1 on the frame 1000 and is movably mounted, and then fastened to the first test bar 7100. [ The first housing 2110 fastened to the first test bar 7100 is positioned while being measured while measuring the degree of parallelism and straightness of the first degree-of-detail measuring unit 7110 by a level measuring instrument, The member B1 is firmly fixed to the frame 1000.

The second housing 2210 is fastened to the frame 1000 with the second housing fastening member B2 fastened and movably mounted, and then is fastened to the second test bar 7200. The second housing 2210 fastened to the second test bar 7200 is positioned while the parallelism and the straightness of the second accuracy measuring unit 7210 are measured by the accuracy measuring equipment, The member B2 is firmly fastened to the frame 1000 firmly.

After the first housing 2110 and the second housing 2210 are fixed to the frame 1000, the first test bar 7100 is detached from the first housing 2110, 2 test bar 7200 is detached from the second housing 2210.

The first bearing 2120 and the first retainer 2130 are mounted in the first housing 2110 in which the first test bar 7100 is detached and one end of the ball screw 3000 is inserted into the first housing 2110, Is inserted into the first bearing 2120 and the first retainer 2130 and the first fixing nut 2140 is fastened to one end of the ball screw 3000.

The second bearing 2220 and the second retainer 2230 are mounted in the second housing 2210 in which the second test bar 7200 is detached and the other end of the ball screw 3000 Is inserted into the second bearing 2220 and the second retainer 2230 and the second fixing nut 2240 is fastened to the other end of the ball screw 3000.

However, the method of installing the conventional test bar 7000 and the bearing unit 2000 for supporting the ball screw 3000 using the conventional test bar 7000 has a problem that the versatility of the test bar 7000 is low, As the test bar 7000 is provided, there is a problem that the cost required for manufacturing and storing the test bar 7000 increases. Particularly, as the plurality of ball screws 3000 are provided, the problem of cost increase becomes worse.

In addition, since the support structure between the test bar 7000 and the bearing unit 2000 is different from the support structure between the ball screw 3000 and the bearing unit 2000, the bearing unit 2000 is positioned at a position different from the predetermined position There is a problem that it is fixed to the frame 1000. That is, the test bar 7000 is fastened to the housings 2110 and 2210 of the bearing unit 2000, but the ball screw 3000 is connected to the bearings 2120 and 2220 of the bearing unit 2000, the retainers 2130 and 2230, When the ball screw 3000 is installed in the bearing unit 2000 positioned with respect to the test bar 7000 as the ball screw 3000 is fastened to the fixing nuts 2140 and 2240, There was a problem of getting out.

Korean Patent Publication No. 10-21015-0124564

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a test bar for improving the versatility and reducing the manufacturing and storage costs, and a method for installing a bearing unit for supporting a ball screw using the same.

It is another object of the present invention to provide a test bar in which a bearing unit can be installed in a predetermined position on a frame, and a method of installing a bearing unit for supporting a ball screw using the same.

In order to achieve the above object, the present invention is a test bar used for checking whether a bearing unit supporting a ball screw is disposed at a predetermined position in a frame supporting the bearing unit, An accuracy measuring unit formed in the axial direction and measurable by an accuracy measuring instrument; And a support portion extending from the accuracy measuring portion along the axial direction and supported by the bearing unit, wherein the support portion is inserted into a bearing of the bearing unit and is configured to be rotatably supported.

The support portion may be supported by the bearing unit in the same structure as the structure in which the ball screw is supported by the bearing unit.

Wherein the bearing unit comprises: a housing which is seated on the frame and has a shaft hole penetrating through the ball screw or the support portion; A bearing supported on an axial hole of the housing and rotatably supporting the ball screw or the support portion; A retainer for supporting the bearing in the axial direction of the bearing; And a lock nut which is fastened to the ball screw or the support portion on the opposite side of the bearing with respect to the retainer and supports the retainer, the support portion being provided on the bearing, the retainer, Can be inserted and supported.

The bearing includes: an outer ring supported on an inner circumferential surface of the shaft hole; And an inner ring opposed to the outer ring and supported by the ball screw or the support portion, wherein the retainer includes: an outer retainer fixedly coupled to the housing and supporting the outer ring of the bearing; And an inner retainer which is opposed to the outer retainer and is supported by the ball screw or the support portion and is pressed by the retaining nut to support the inner ring of the bearing, and the support portion includes an inner ring of the bearing, And can be supported by the fixing nut.

Wherein the support portion includes: a step portion having a stepped surface extending to the accuracy measuring portion and having an outer diameter larger than an inner diameter of the bearing, the stepped portion contacting a side surface of the bearing; And an outer diameter extending from the step portion to the opposite side of the accuracy measuring portion, the outer diameter being formed at the same level as the inner diameter of the bearing, the inner diameter of the retainer, and the inner diameter of the fixing nut, And a journal portion.

The step surface of the step portion may be formed with a predetermined roughness.

Wherein the journal portion includes: a first journal portion contacting the inner circumferential surface of the bearing and the inner circumferential surface of the retainer; And a journal portion second portion which is fastened to the fixing nut on the opposite side of the step portion with respect to the first portion of the journal portion.

The outer circumferential surface of the first portion of the journal portion may be formed with a predetermined roughness.

And a male screw portion that is screwed with the female threaded portion of the fixing nut may be formed on an outer circumferential surface of the second portion of the journal portion.

And a grip portion extending from the support portion to the opposite side of the accuracy measuring portion.

The grip portion may be formed such that an outer diameter of the grip portion is smaller than or equal to an inner diameter of the bearing, an inner diameter of the retainer, and an inner diameter of the fixing nut so as to protrude through the bearing, the retainer and the fixing nut.

A knuling may be formed on the outer circumferential surface of the grip portion.

Wherein the bearing unit is provided with two bearings for supporting both ends of the ball screw, the outer diameter of the bearings is determined by an inner diameter of a bearing provided in any one of the two bearing units, It can be formed at the same level as the inner diameter.

The number of the ball screws may be two, and the number of the ball screws may be less than the number of the bearing units.

According to the outer diameter standard of the support part, the support part can be replaced according to the inner diameter of the bearing.

Meanwhile, the present invention provides a method of manufacturing a semiconductor device, comprising: a test bar including the test bar; A bearing unit seating step of movably seating the bearing unit on the frame; A test bar inserting step of inserting a support part of the test bar provided in the test bar inserting step into a bearing of the bearing unit seated in the bearing unit mounting step; A test bar fastening step of fastening the fixing nut of the bearing unit to the support part inserted into the bearing in the test bar inserting step; The test bars fastened to the fixing nut are rotated in the test bar fastening step and the radial swing values of the precision measuring unit are measured at one end and the other end of the precision measuring unit, A first adjustment step of adjusting a relative position of the test bar with respect to the test bar; Wherein the first adjusting step measures the parallelism and the straightness between the test bars and the LM guides of the frame in which both end shakes of the accuracy measuring unit are matched, A second adjusting step of adjusting a position of the unit; A bearing unit fixing step of fixing the bearing unit, which has been adjusted in position in the second adjusting step, to the frame with a fastening member; And a test bar removing step of detaching the test bar from the bearing unit fixed in the bearing unit fixing step by removing the fixing nut from the supporting unit.

The test bar according to the present invention and the method for installing a bearing unit for supporting a ball screw according to the present invention are formed such that a support part of a test bar supported by a bearing unit is inserted into a bearing of the bearing unit so as to be rotatably supported, It can be fastened to the bearing unit, and the versatility of the test bar can be improved. Thus, the cost required for manufacturing and storing the test bar can be reduced.

Further, since the support structure between the test bar and the bearing unit is formed in the same structure as the support structure between the ball screw and the bearing unit, the bearing unit can be installed in the frame at a predetermined position. Accordingly, when the ball screw is installed in the bearing unit installed on the basis of the test bar, the degree of the ball screw can be included in the predetermined range.

1 is a front view showing a conventional first test bar,
Fig. 2 is a side view of Fig. 1,
3 is a front view showing a conventional second test bar,
Fig. 4 is a side view of Fig. 3,
5 is a cross-sectional view showing the first test bar of Figs. 1 and 2 and the positioning of the test bar bearing unit of Figs. 3 and 4; Fig.
6 is a cross-sectional view showing a state in which a ball screw is fastened to a bearing unit in which installation is completed;
FIG. 7 is a front view showing a test bar according to an embodiment of the present invention;
8 is a cross-sectional view showing a state where the test bar of FIG. 7 is mounted on the bearing unit,
FIG. 9A is a perspective view showing a state in which a bearing unit for positioning using the test bar of FIG. 7 is seated on a frame;
FIG. 9B is a perspective view showing a state where the test bar of FIG. 7 is fastened to the bearing unit of FIG. 9A,
FIG. 9c is a perspective view showing a state where the test bar is adjusted while rotating the test bar of FIG. 9b,
FIG. 9D is a perspective view showing a state in which the position of the bearing unit is adjusted and fixed to the frame while measuring the parallelism and straightness of the test bar and the LM guide adjusted in FIG. 9C,
FIG. 9E is a perspective view showing a state in which the test bar is removed from the fixed bearing unit in FIG. 9D and the ball screw is tightened;
FIG. 9F is a perspective view showing a state in which the run-out of the ball screw fastened in FIG. 9E is measured. FIG.

Hereinafter, a test bar according to the present invention and a method of installing a bearing unit for supporting a ball screw using the test bar will be described in detail with reference to the accompanying drawings.

7 is a front view showing a test bar according to an embodiment of the present invention, FIG. 8 is a sectional view showing a test bar of FIG. 7 mounted on a bearing unit, FIG. 9A is a cross- FIG. 9B is a perspective view showing a state in which the test bar of FIG. 7 is fastened to the bearing unit of FIG. 9A, FIG. 9C is a perspective view of the bearing unit of FIG. FIG. 9D is a perspective view showing a state in which the position of the bearing unit is adjusted and fixed to the frame while measuring the parallelism and straightness of the test bar and the LM guide adjusted in FIG. 9C, and FIG. , FIG. 9E is a perspective view showing a state in which the test bar is removed from the fixed bearing unit in FIG. 9D and the ball screw is tightened, and FIG. FIG. 9E is a perspective view showing a state in which the runout of the ball screw fastened in FIG. 9E is measured. FIG.

6 is a cross-sectional view showing a state where a ball screw is fastened to a bearing unit in which installation is completed.

6 through 9F, a machine tool includes a frame 1000 (e.g., a bed, a saddle, a column), a bearing unit 2000 installed on the frame 1000, A motor 4000 for rotating the ball screw 3000 and a ball screw 3000 which is rotatably supported by the ball screw 3000 and is reciprocated by the rotation of the ball screw 3000, And a nut block 5000 for conveying an object (e.g., a workpiece), the bearing unit 2000 having a test bar (not shown) for enhancing the accuracy of the ball screw 3000 a test bar 6000 may be installed in the frame 1000 at a predetermined position.

More specifically, the bearing unit 2000 includes a first bearing unit 2100 for supporting one end of the ball screw 3000 or a support part 6200 of the test bar 6000 and a ball screw 3000 And a second bearing unit 2200 for supporting the other end of the test bar 6000 or a support part 6200 to be described later of the test bar 6000. The bearing unit 2000 is coupled to the test bar 6000 so that the bearing unit 2000 is installed in the frame 1000 and the bearing unit 2000 is installed in the frame 1000 And is then separated from the test bar 6000 and joined with the ball screw 3000.

The first bearing unit 2100 includes a first axial hole 2112 which is seated on the frame 1000 and passes through one end of the ball screw 3000 or a support portion 6200 to be described later of the test bar 6000, A first housing 2110 having a first axial hole 2112 and a first axial hole 2112 and a first axial hole 2112 and a later-described support portion of the test bar 6000 A first retainer 2130 for supporting the first bearing 2120 in the axial direction of the first bearing 2120 and a second retainer 2130 for retaining the first retainer 2130 in the reference Which is fastened to one end of the ball screw 3000 or a support portion 6200 to be described later of the test bar 6000 at the opposite side of the first bearing 2120 and supports the first retainer 2130 And may include a lock nut 2140.

The first housing 2110 includes a first bearing wall portion 2114 in which the first shaft hand hole 2112 is formed and a first coupling wall portion 2114 extending from the first bearing wall portion 2114 and fastened to the frame 1000. [ (2116).

The first bearing wall portion 2114 includes a first opposing face 2114a opposed to the nut block 5000 and a first back face 2114b which is a back face of the first opposing face 2114a, The uniaxial hand hole 2112 may be formed through the first bearing wall 2114 from the first opposing face 2114a to the first back face 2114b.

The first axial shaft hole 2112 includes a first shaft hole first portion 2112a formed to be engraved from the first opposing surface 2114a and a second shaft axial hole first portion 2112b formed to be engraved from the first reverse surface 2114b, And a first axis of rotation second portion 2112b communicating with the first portion 2112a.

The first axis of the second shaft portion 2112b may have a larger inner diameter than the first axis of the first shaft portion 2112a so as to be stepped with the first axis of the first shaft portion 2112a. Accordingly, a first shaft hand hole stepped surface 2112c may be formed between the inner circumferential surface of the first shaft hand hole first portion 2112a and the inner circumferential surface of the first shaft hand hole second portion 2112b.

A plurality of first housing fastening holes 2116a through which the plurality of first housing fastening members B1 for fastening the first housing 2110 to the frame 1000 are respectively passed through the first fastening wall portion 2116 . The first housing fastening member B1 is fastened to the frame 1000 through the first housing fastening hole 2116a and urges the first fastening wall portion 2116 toward the frame 1000 , The first housing 2110 can be fastened to the frame 1000.

The first bearing 2120 includes a first outer ring 2122 formed in an annular shape and supported by an inner peripheral surface of the first axial shaft second portion 2112b and an annular shape having a diameter smaller than that of the first outer ring 2122 A first inner ring 2124 opposed to the inner circumferential surface of the first outer ring 2122 and supported at a first end of the ball screw 3000 or a support portion 6200 to be described later of the test bar 6000, And a first ball 2126 interposed between the first inner ring 2122 and the first inner ring 2124.

The first bearing 2120 is fixed to the first housing 2110 and the first inner ring 2124 is fixed to the first inner ring 2124. The first bearing 2120 is fixed to the first housing 2110, The support portion 6200 of the test bar 6000 or the one end of the test screw 6000 is rotated together with the end portion of the ball screw 3000 or the support portion 6200 of the test bar 6000, And can be rotatably supported.

Meanwhile, the first bearings 2120 may be provided in plural along the axial direction of the first bearings 2120.

The first retainer 2130 includes a first outer retainer 2132 for supporting the first outer ring 2122 in the axial direction of the first bearing 2120 and a second outer retainer 2132 for supporting the first inner ring 2124 in the axial direction of the first bearing 2120. [ And a first inner retainer 2134 for supporting the first inner retainer 2134 in the axial direction of the second retainer 2120.

The first outer retainer 2132 is formed in an annular shape and the outer peripheral portion of the first outer retainer 2132 is fixedly coupled to the first housing 2110 (more precisely, the first back surface 2114b) 1 inner peripheral portion of the outer retainer 2132 is in close contact with the first outer ring 2122 to support the first outer ring 2122. [

The first inner retainer 2134 is formed in an annular shape having a smaller diameter than the first outer retainer 2132 and is opposed to the inner peripheral surface of the first outer retainer 2132. The inner peripheral surface of the first inner retainer 2134 The one end of the first inner retainer 2134 is brought into close contact with the first inner ring 2124 so that the one end of the first inner retainer 2134 is in close contact with the one end of the ball screw 3000 or a support portion 6200 of the test bar 6000, The first inner ring 2124 can be supported.

The first inner retainer 2134 is fixed to the first inner retainer 2134 at the other side by the first retaining nut 2140 so as to firmly support the first inner retainer 2134 can do.

The first fixing nut 2140 is formed in an annular shape and an inner circumferential surface of the first fixing nut 2140 is fixed to one end of the ball screw 3000 or a support portion 6200 A first female thread portion 2142 to be engaged can be formed.

The first fixing nut 2140 is screwed to one end of the ball screw 3000 or a support portion 6200 of the test bar 6000 to be described later, The first inner retainer 2134 and the first inner ring 2124 are brought into close contact with the stepped surface of the ball screw 3000 or a stepped stepped surface 6212 The first inner ring 2124 and the first inner retainer 2134 are firmly coupled to each other or the test bar 6000, the first inner ring 2124, The inner retainer 2134 can be firmly engaged. At this time, the outer circumferential portion of the first fixing nut 2140 may be spaced apart from the first outer retainer 2132 to prevent friction with the first outer retainer 2132.

The second bearing unit 2200 includes a second axial hole 2212 which is seated on the frame 1000 and penetrates through the other end of the ball screw 3000 or a support portion 6200 to be described later of the test bar 6000, A second housing 2210 having a first shaft hole 2212 and a second shaft hole 2212 formed between the second shaft hole 2212 and the other end of the ball screw 3000, A second retainer 2230 for supporting the second bearing 2220 in the axial direction of the second bearing 2220 and a second retainer 2230 interposed between the second retainer 2230 and the second retainer 2230. [ Which is fastened to the other end of the ball screw 3000 on the opposite side of the second bearing 2220 or a support portion 6200 of the test bar 6000 described later and supports the second retainer 2230, And may include a nut 2240 (lock nut).

The second housing 2210 includes a second bearing wall portion 2214 in which the second shaft hand hole 2212 is formed and a second fastening wall portion 2214 extending from the second bearing wall portion 2214 and fastened to the frame 1000. [ Gt; 2216 < / RTI >

The second bearing wall portion 2214 includes a second opposing face 2214a opposed to the nut block 5000 and a second back face 2214b which is a back face of the second opposing face 2214a, The biaxial hand hole 2212 may be formed through the second bearing wall portion 2214 from the second opposing face 2214a to the second back face 2214b.

The second shaft hand hole 2212 includes a second shaft hand hole first portion 2212a formed to be engraved from the second opposing surface 2214a and a second shaft hand hole first portion 2212b formed to be engraved from the second back surface 2214b, And a second axial second portion 2212b communicating with the first portion 2212a.

The second axial-hole second portion 2212b may have a larger inner diameter than the second axial-hole first portion 2212a so as to be stepped with the second axial-hole first portion 2212a. Accordingly, a second axial shaft stepped surface 2212c may be formed between the inner circumferential surface of the second shaft hand first portion 2212a and the inner circumferential surface of the second shaft hand portion 2212b.

A plurality of second housing fastening holes 2216a through which the plurality of second housing fastening members B2 for fastening the second housing 2210 to the frame 1000 are respectively passed through the second fastening wall portion 2216 . The second housing fastening member B2 is fastened to the frame 1000 through the second housing fastening hole 2216a and urges the second fastening wall portion 2216 toward the frame 1000 , The second housing 2210 can be fastened to the frame 1000.

The second bearing 2220 includes a second outer ring 2222 formed in an annular shape and supported by the inner peripheral surface of the second axial shaft second portion 2212b, an annular shape having a diameter smaller than that of the second outer ring 2222 A second inner ring 2224 opposed to the inner circumferential surface of the second outer ring 2222 and supported at the other end of the ball screw 3000 or a support portion 6200 to be described later of the test bar 6000, And a second ball 2226 interposed between the first inner ring 2222 and the second inner ring 2224.

The second bearing 2220 is fixed to the second housing 2210 while the second outer ring 2222 is fixed to the second housing 2210 and the second inner ring 2224 is fixed to the second inner ring 2224, The other end of the ball screw 3000 or a later-described support portion 6200 of the test bar 6000 is rotated together with the other end of the test bar 6000 or the support portion 6200 of the test bar 6000, And can be rotatably supported.

The second bearings 2220 may be provided along the axial direction of the second bearings 2220.

The second retainer 2230 includes a second outer retainer 2232 for supporting the second outer ring 2222 in the axial direction of the second bearing 2220 and a second outer retainer 2232 for supporting the second inner ring 2224 in the axial direction of the second bearing 2220. [ And a second inner retainer 2234 for supporting the first inner retainer 2234 in the axial direction of the second inner retainer 2220.

The outer periphery of the second outer retainer 2232 is fixedly coupled to the second housing 2210 (more precisely, the second back surface 2214b), and the outer periphery of the second outer retainer 2232 is fixedly coupled to the second housing 2210 2 The inner peripheral portion of the outer retainer 2232 is in close contact with the second outer ring 2222 to support the second outer ring 2222.

The second inner retainer 2234 is formed in an annular shape having a diameter smaller than that of the second outer retainer 2234 and is opposed to the inner peripheral surface of the second outer retainer 2232. The inner peripheral surface of the second inner retainer 2234, The second inner retainer 2234 is in close contact with the other end of the screw 3000 or a support portion 6200 described later of the test bar 6000 and one side of the second inner retainer 2234 is in close contact with the second inner ring 2224, 2 inner ring 2224 can be supported.

The other end of the second inner retainer 2234 is pressed by the second retaining nut 2240 to be more firmly fixed so that the second inner retainer 2234 is more firmly fixed to the second inner retainer 2234 can do.

The second fixing nut 2240 is formed in an annular shape and an inner circumferential surface of the second fixing nut 2240 is fixed to the other end of the ball screw 3000 or a support portion 6200, And a second female threaded portion 2242 to be engaged can be formed.

The second fixing nut 2240 is screwed to the other end of the ball screw 3000 or a support portion 6200 of the test bar 6000 to be described later, The second inner retainer 2234 and the second inner ring 2224 are brought into close contact with the stepped surface of the ball screw 3000 or a stepped stepped surface 6212 The second inner ring 2224 and the second inner retainer 2234 by tightly coupling the ball screw 3000, the second inner ring 2224 and the second inner retainer 2234 by tightly fitting the test bar 6000, the second inner ring 2224, The inner retainer 2234 can be firmly engaged. At this time, the outer circumferential portion of the second fixing nut 2240 may be spaced apart from the second outer retainer 2232 to prevent friction with the second outer retainer 2232.

The inner diameter of the first inner retainer 2134, the inner diameter of the first retaining nut 2140 (the major diameter of the first internal thread 2142), the inner diameter of the first inner retainer 2134, The inner diameter of the second inner retainer 2234 and the inner diameter of the second fixing nut 2240 (the major diameter of the second female screw portion 2242) of the test bar 6000 Can be formed at an equal level with each other so that the support portion 6200 can pass through.

The test bar 6000 is an inspection equipment used to check whether the first bearing unit 2100 and the second bearing unit 2200 are respectively disposed in the frame 1000 in a predetermined position. The test bar 6000 may be used to inspect the first bearing unit 2100 or may be used to inspect the first bearing unit 2100. The test bar 6000 may be coupled to the second bearing unit 2200 as well as the first bearing unit 2100, 2 bearing unit 2200 of the present invention.

The test bar 6000 may include a degree measuring unit 6100 measurable by a precision measuring instrument (for example, an indicator), a first measuring unit 6100, a second measuring unit 6200, And a grip portion 6300 extending from the support portion 6200 to the opposite side of the degree-of-measurement portion 6100.

The accuracy measuring unit 6100 may be formed in a cylindrical shape extending in the axial direction.

The support portion 6200 extends from the accuracy measuring portion 6100 along the axial direction of the accuracy measuring portion 6100 and has the same structure as the structure in which the ball screw 3000 is supported by the bearing unit 2000 (Inner ring 2124, 2224, inner retainer 2134, 2234 and fixing nuts 2140, 2240) supported on the bearing unit 2000. [

More specifically, the support portion 6200 includes a step portion 6210 extending to the accuracy measuring portion 6100 and a journal portion 6220 extending from the step portion 6210 to the opposite side of the accuracy measuring portion 6100, . ≪ / RTI >

The outer diameter of the step portion 6210 is larger than the outer diameter of the degree measuring portion 6100 and the outer diameter of the journal portion 6220 and the inner diameter of the first axis hand first portion 2112a And the inner diameter of the second axis hand first portion 2212a. Accordingly, the step portion 6210 can be inserted into the first axial-shaft first portion 2112a or the second axial-shaft second portion 2212b, and the side portion of the first inner ring 2124 or the second axial- And a stepped stepped surface 6212 contacting the side of the inner ring 2224. The stepped stepped surface 6212 is bent from the outer circumferential surface of the stepped portion 6210 and bent from the outer circumferential surface of the journal portion 6220 so that the outer peripheral surface of the stepped portion 6210 and the surface of the journal portion 6220 Refers to a surface connecting the outer circumferential surfaces.

The stepped step surface 6212 may be formed with a predetermined roughness. Accordingly, when the test bar 6000 is coupled to the first bearing unit 2100, damage to the first inner ring 2124 is prevented, and the stepped portion 6210 is moved to the predetermined position 1 inner ring 2124, as shown in Fig. That is, the degree of coupling (accuracy) between the step portion 6210 and the first inner ring 2124 can be improved. When the test bar 6000 is coupled to the second bearing unit 2200, damage to the second inner ring 2224 is prevented, and the stepped portion 6210 is moved to the second predetermined position It can be contacted with the inner ring 2224. That is, the degree of engagement between the step portion 6210 and the second inner ring 2224 can be improved.

The stepped portion 6210 of such a configuration prevents the test bar 6000 from moving in the axial direction of the test bar 6000 from a predetermined position and the first fixing nut 2140 is moved to the support portion The inner barrel 2124 and the first inner retainer 2134 when the test bar 6000 is fastened to the first inner ring 2124 and the first inner retainer 2134, The second inner ring 2224 and the second inner retainer 2234 are fixed to each other when the second fixing nut 2240 is fastened to the support portion 6200. [ So that the test bar 6000 is firmly fastened to the second inner ring 2224, the second inner retainer 2234, and the second fixing nut 2240.

The journal portion 6220 is formed such that the outer diameter of the journal portion 6220 is smaller than the outer diameter of the journal portion 6220 so that the journal portion 6220 can be inserted into the first inner ring 2124, the first inner retainer 2134, 1 inner ring 2124, the inner diameter of the first inner retainer 2134, and the inner diameter of the first fixing nut 2140. The inner diameter of the first inner retainer 2134, the inner diameter of the first retaining nut 2140, the inner diameter of the second inner ring 2224, the inner diameter of the second inner retainer 2124 The outer diameter of the journal portion 6220 is smaller than the inner diameter of the second inner ring 2224 and the inner diameter of the first fixing nut 2240 is equal to the inner diameter of the second fixing nut 2240, The second inner retainer 2234 and the second retaining nut 2240 are formed at the same level as the inner diameter of the second inner retainer 2234 and the inner diameter of the second retaining nut 2240, (2240).

The journal portion 6220 is in contact with the inner circumferential surface of the first inner ring 2124 and the inner circumferential surface of the first inner retainer 2134 or the inner circumferential surface of the second inner ring 2224 and the inner circumferential surface of the second inner retainer 2234 The first fixing nut 2140 and the second fixing nut 2140 are provided on the opposite side of the step portion 6210 with respect to the first portion 6222 of the journal portion, And a second journal portion 6224 which is fastened to the second retaining nut 2240.

The outer circumferential surface of the first portion 6222 may be formed with a predetermined roughness. Accordingly, when the test bar 6000 is coupled to the first bearing unit 2100, damage to the first inner retainer 2134 and the first inner retainer 2134 is prevented, The portion 6222 can be coupled to the first inner ring 2124 and the first inner retainer 2134 at a predetermined position. That is, the degree of engagement between the journal portion first portion 6222 and the first inner ring 2124 and the degree of engagement between the journal portion first portion 6222 and the first inner retainer 2134 can be improved. When the test bar 6000 is coupled to the second bearing unit 2200, damage to the second inner ring 2224 and the second inner retainer 2234 is prevented, The first inner retainer 6222 can be coupled to the second inner ring 2224 and the second inner retainer 2234 in a predetermined position. That is, the degree of engagement between the journal portion first portion 6222 and the second inner ring 2224 and the degree of engagement between the journal portion first portion 6222 and the second inner retainer 2234 can be improved.

The first fixing nut 2140 and the second fixing nut 2240 are screwed to the outer circumferential surface of the journal portion second portion 6224 with the first female threaded portion 2142 of the first fixing nut 2140 or the second female threaded portion 2242 of the second fixing nut 2240. [ A screw portion 6224a may be formed.

The gripper 6300 is a component that allows the operator to easily grasp the gripper 6300 and rotate the test bar 6000 in a first adjustment step S5 to be described later, The second inner retainer 2234 and the second retaining nut 2240 through the first inner retainer 2124, the first inner retainer 2134 and the first retaining nut 2140, The outer diameter of the grip portion 6300 is larger than the inner diameter of the first inner ring 2124 and the inner diameter of the first inner retainer 2134 so as to protrude to the opposite side of the accuracy measuring portion 6100, The inner diameter of the fixing nut 2140, the inner diameter of the second inner ring 2224, the inner diameter of the second inner retainer 2234, and the inner diameter of the second fixing nut 2240.

A knurling 6310 for preventing slippage may be formed on the outer circumferential surface of the grip portion 6300.

Hereinafter, a method of installing the bearing unit 2000 using the test bar 6000 will be described.

9A to 9F, a method of installing the bearing unit 2000 using the test bar 6000 may include a test bar mounting step S1 including the test bar 6000; A bearing unit seating step (S2) for movably placing the bearing unit (2000) on the frame (1000); The support portion 6200 of the test bar 6000 provided in the test bar attaching step S1 is inserted into the bearings 2120 and 2220 of the bearing unit 2000 seated in the bearing unit mounting step S2 A test bar inserting step (S3); A test bar engaging step (S4) of fastening the fixing nut (2140; 2240) of the bearing unit (2000) to the supporting part (6200) inserted in the bearings (2120; 2220) in the test bar inserting step (S3); The test bar 6000 fastened to the fixing nuts 2140 and 2240 is rotated in the test bar engaging step S4 and the test bar 6000 is rotated at one end and the other end of the accuracy measuring unit 6100 A first adjustment step (S5) of measuring a radial shake value, respectively, and adjusting a relative position of the test bar (6000) with respect to the bearing unit (2000) until the two measured values coincide; The parallelism and the straightness between the test bar 6000 and the LM guide 1100 of the frame 1000 are matched with each other at both ends of the accuracy measuring unit 6100 in the first adjusting step S5, A second adjustment step (S6) of adjusting a position of the bearing unit (2000) fastened to the test bar (6000) until a value is included in a predetermined range; A bearing unit fixing step (S7) of fixing the bearing unit 2000 whose position adjustment is completed in the second adjustment step S6 to the frame 1000 with the fastening members B1 and B2; And a test bar removing step of removing the test bar 6000 from the bearing unit 2000 fixed in the bearing unit fixing step S7 by removing the fixing nuts 2140 and 2240 from the supporting part 6200, (S8).

More specifically, after one of the first bearing unit 2100 and the second bearing unit 2200 is installed on the frame 1000 by the test bar 6000, the first bearing unit 2100 And the second bearing unit 2200 may be installed in the frame 1000 by the test bar 6000. The first bearing unit 2100 may be installed first would.

That is, as shown in Fig. 9A, in the bearing unit seating step S2, the first bearing unit 2100 can be movably seated in the frame 1000. [ At this time, the first bearing unit 2100 has the first bearing 2120 and the first retainer 2130 mounted in the first housing 2110, And can be fastened to the frame 1000 by the first housing fastening member B1.

9B, the support portion 6200 (more precisely, the journal portion 6220) of the test bar 6000 is inserted in the test bar inserting step S3 and the test bar engaging step S4, And the grip portion 6300 may be inserted into the first bearing 2120 and the first retainer 2130 through the first shaft hand hole 2112. [ The first fixing nut 2140 is fastened to the support portion 6200 (more precisely, the journal portion 6220) so that the test bar 6000 is fixed to the first bearing 2120, 2130 and the first fixing nut 2140. Here, lubricant (for example, grease) may be applied to the support portion 6200 (more precisely, the journal portion first portion 6222).

Next, as shown in FIG. 9C, in the first adjusting step S5, the test bar 6000 is rotated, and the level measuring unit 6100 is rotated at the first and second ends of the level measuring unit 6100, The radial shake values of the degree-of-detail measuring section 6100 can be measured respectively. When the two measurement values are different, the relative position of the test bar 6000 with respect to the first bearing unit 2100 is adjusted so that the two measurement values are coincident while the first fixing nut 2140 is hit with a rubber hammer or the like, Can be adjusted. The test bar 6000 is installed at a predetermined position with respect to the first bearing unit 2100 on the basis of the both end shaking values of the test bar 6000 measured while the test bar 6000 is rotated The degree of engagement between the test bar 6000 and the first bearing unit 2100 can be improved and the position of the first bearing unit 2100 with respect to the frame 1000 can be improved.

9D, in the second adjustment step S6 and the bearing unit fixing step S7, the parallelism between the test bar 6000 and the LM guide 1100 of the frame 1000 And the relative position of the first bearing unit 2100 with respect to the frame 1000 is adjusted until the measured value is included in the predetermined range, and the relative position of the first bearing The unit 2100 can be firmly fixed to the frame 1000 by the official tightening of the first housing fastening member B1.

Next, after the first fixing nut 2140 is detached from the support portion 6200, the test bar 6000 may be detached from the first bearing unit 2100.

After the installation of the first bearing unit 2100 is completed, the bearing unit mounting step S2, the test bar inserting step S3, the test bar engaging step S4, The second bearing unit 2200 may be fixed to the frame 1000 by repeating the first adjusting step S5, the second adjusting step S6 and the bearing unit fixing step S7.

That is, the second bearing unit 2200 can be movably seated on the frame 1000. At this time, the second bearing unit 2200 is fixed to the second housing 2210 while the second bearing 2220 and the second retainer 2230 are mounted in the second housing 2210, And can be fastened to the frame 1000 by the second housing fastening member B2.

The support portion 6200 (more precisely, the journal portion 6220) and the grip portion 6300 of the test bar 6000 penetrate through the second shaft hand hole 2212 and the second bearing 2220 and the And can be inserted into the second retainer 2230. The second fixing nut 2240 is fastened to the support portion 6200 (more precisely, the journal portion 6220) so that the test bar 6000 is fixed to the second bearing 2220, 2230) and the second fixing nut (2240).

As the test bar 6000 is rotated, the radial shaking value of the accuracy measuring unit 6100 can be measured at the one end and the other end of the accuracy measuring unit 6100 by the accuracy measuring equipment. When the two measurement values are different, the relative position of the test bar 6000 with respect to the second bearing unit 2200 is adjusted so that the measured values are coincident with each other while bombarding the second fixing nut 2240 with a rubber hammer or the like, Can be adjusted. The test bar 6000 is installed at a predetermined position with respect to the second bearing unit 2200 on the basis of the both end shaking values of the test bar 6000 measured while the test bar 6000 is rotated The degree of engagement between the test bar 6000 and the second bearing unit 2200 is improved and eventually the degree of position of the second bearing unit 2200 with respect to the frame 1000 can be improved.

The parallelism and the straightness between the test bar 6000 and the LM guide 1100 are measured and the second bearing unit for the frame 1000 until the measured value is included in the predetermined range 2200 are adjusted and the second bearing unit 2200 whose position adjustment is completed can be firmly fixed to the frame 1000 by the official tightening of the second housing fastening member B2.

After the second fixing nut 2240 is detached from the support portion 6200, the test bar 6000 may be detached from the second bearing unit 2200.

9E, after the first bearing unit 2100 and the second bearing unit 2200 are installed, the ball screw 3000 is inserted into the first bearing unit 2100, And the first fixing nut 2140 and the second fixing nut 2240 are fastened to the ball screw 3000 so that the ball screw 3000 is inserted into the second bearing unit 2200, .

Thereafter, as shown in FIG. 9F, the run out and parallelism of the ball screw 3000 can be measured.

The method for mounting the test bar 6000 and the bearing unit 2000 for supporting the ball screw 3000 using the test bar 6000 according to the present embodiment is characterized in that the support structure between the test bar 6000 and the bearing unit The bearing unit 2000 can be installed in the frame 1000 at a predetermined position, since the bearing unit 2000 is formed in the same structure as the supporting structure between the screw 3000 and the bearing unit 2000. Accordingly, when the ball screw 3000 is installed in the bearing unit 2000 provided with reference to the test bar 6000, the degree of the ball screw 3000 can be included in a predetermined range.

Since the support portion 6200 of the test bar 6000 supported by the bearing unit 2000 is formed to be rotatably supported by being inserted into the bearing of the bearing unit 2000, It can be fastened to various bearing units 2000, so that the versatility of the test bar 6000 can be improved. That is, the bearing unit 2000 is provided to support both ends of the ball screw 3000. When a plurality of the ball screws 3000 are provided, the number of the bearing units 2000 is equal to the number of the ball screws 3000 3000) number of times. The inner diameter of the bearing, the retainer, and the fixing nut of at least some of the plurality of bearing units 2000 (hereinafter, the inner diameter of the bearing unit 2000) May be formed in the same manner. The test bar 6000 according to the present embodiment is configured such that the outer diameter of the support portion 6200 (the inner diameter of the bearing unit 2000) is a standard determining element of the test bar 6000, (The inner diameter of the bearing unit 2000) and is replaceable according to the inner diameter of the bearing unit 2000. Therefore, even if the shape of the housing is different, It is possible to inspect a plurality of bearing units 2000 whose inner diameters coincide with each other. Accordingly, the number of the test bars 6000 may be less than the number of the bearing units 2000. Thus, the cost required for manufacturing and storing the test bar 6000 can be reduced.

1000: Frame 1100: LM Guide
2000: bearing unit 2100: first bearing unit
2110: first housing 2112: first shaft water hole
2120: first bearing 2122: first outer ring
2124: first inner ring 2130: first retainer
2132: first outer retainer 2134: first inner retainer
2140: first fixing nut 2142: first female screw part
2200: second bearing unit 2210: second housing
2212: second shaft hand 2220: second bearing
2222: second outer ring 2224: second inner ring
2230: Second retainer 2232: Second outer retainer
2234: second inner retainer 2240: second fixing nut
2242: Second female screw part 3000: Ball screw
6000: test bar 6100: degree measuring unit
6200: Support part 6210:
6212: stepped surface step surface 6220: journal part
6222: First part of the journal part 6224a:
6224: journal part second part 6300: grip part
6310: Knurling

Claims (16)

A test bar for use in testing whether a bearing unit supporting a ball screw is disposed in a predetermined position in a frame supporting the bearing unit, the test bar comprising: A degree-of-measurement measuring unit capable of measuring the intensity of the light; And a support portion extending from the accuracy measuring portion along the axial direction and supported by the bearing unit, wherein the support portion is inserted into a bearing of the bearing unit so as to be rotatably supported, A bar staging step;
A bearing unit seating step of movably seating the bearing unit on the frame;
A test bar inserting step of inserting a support part of the test bar provided in the test bar inserting step into a bearing of the bearing unit seated in the bearing unit mounting step;
A test bar fastening step of fastening the fixing nut of the bearing unit to the support part inserted into the bearing in the test bar inserting step;
The test bars fastened to the fixing nut are rotated in the test bar fastening step and the radial swing values of the precision measuring unit are measured at one end and the other end of the precision measuring unit, A first adjustment step of adjusting a relative position of the test bar with respect to the test bar;
Wherein the first adjusting step measures the parallelism and the straightness between the test bars and the LM guides of the frame in which both end shakes of the accuracy measuring unit are matched, A second adjusting step of adjusting a position of the unit;
A bearing unit fixing step of fixing the bearing unit, which has been adjusted in position in the second adjusting step, to the frame with a fastening member; And
And a test bar removing step of removing the test bar from the bearing unit fixed in the bearing unit fixing step by removing the fixing nut from the supporting unit. The method according to claim 1,
Wherein the support unit is supported by the bearing unit in the same structure as the structure in which the ball screw is supported by the bearing unit. The method according to claim 1,
The bearing unit includes:
A housing which is seated in the frame and has a shaft hole penetrating through the ball screw or the support portion;
A bearing supported on an axial hole of the housing and rotatably supporting the ball screw or the support portion;
A retainer for supporting the bearing in the axial direction of the bearing; And
And a lock nut fastened to the ball screw or the support portion on the opposite side of the bearing with respect to the retainer and supporting the retainer,
Wherein the supporting portion is inserted into and supported by the bearing, the retainer, and the fixing nut. The method of claim 3,
The bearing
An outer ring supported on an inner circumferential surface of the shaft hole; And
And an inner ring opposed to the outer ring and supported by the ball screw or the support portion,
The retainer
An outer retainer fixedly coupled to the housing and supporting the outer ring of the bearing; And
And an inner retainer opposed to the outer retainer and supported by the ball screw or the support portion and supported by the retaining nut to support the inner ring of the bearing,
Wherein the supporting portion is supported by the inner ring of the bearing, the inner retainer, and the fixing nut. The method of claim 3,
The support portion
A step portion extending to the accuracy measuring portion and having an outer diameter larger than an inner diameter of the bearing and having a stepped surface contacting a side surface of the bearing; And
And an outer diameter of the journal is formed to be equal to an inner diameter of the bearing, an inner diameter of the retainer, and an inner diameter of the fixing nut, the journal being inserted into the retainer, Wherein the bearing unit is provided with a bearing. 6. The method of claim 5,
Wherein the stepped surface of the step portion is formed with a predetermined roughness. 6. The method of claim 5,
The journal section includes:
A journal portion first portion in contact with an inner circumferential surface of the bearing and an inner circumferential surface of the retainer; And
And a journal portion second portion that is fastened to the fixing nut on the opposite side of the step portion with respect to the first portion of the journal portion. 8. The method of claim 7,
Wherein the outer peripheral surface of the first portion of the journal is formed with a predetermined roughness. 8. The method of claim 7,
And a male screw portion that is screwed with the female screw portion of the fixing nut is formed on an outer circumferential surface of the second portion of the journal portion. The method of claim 3,
And a grip portion extending from the support portion to an opposite side of the accuracy measuring portion. 11. The method of claim 10,
Wherein the gripping part is formed with a bearing unit for supporting a ball screw, the outer diameter of which is smaller than or equal to an inner diameter of the bearing, an inner diameter of the retainer, and an inner diameter of the fixing nut so as to protrude through the bearing, the retainer, How to install. 12. The method of claim 11,
Wherein a knurling is formed on an outer circumferential surface of the grip portion. The method according to claim 1,
Wherein the bearing unit is provided in two to support both ends of the ball screw,
Wherein the outer diameter of the support portion is formed to be equal to an inner diameter of a bearing provided on any one of the two bearing units and an inner diameter of a bearing provided on the other of the two bearing units. The method according to claim 1,
The plurality of ball screws are provided,
The bearing unit is provided for each ball screw so as to support both ends of each ball screw,
Wherein the number of the bearing units is less than the number of the bearing units. The method according to claim 1,
A plurality of support portions provided for each outer diameter standard,
Wherein the bearing unit is replaceable according to an inner diameter of the bearing. delete
KR1020150175960A 2015-12-10 2015-12-10 Test bar and installation method for ball screw support bearing unit using the same KR101795178B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020150175960A KR101795178B1 (en) 2015-12-10 2015-12-10 Test bar and installation method for ball screw support bearing unit using the same

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CN111188842A (en) * 2020-02-17 2020-05-22 邹国华 Automatic pressing device for bearing steel balls

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CN115046669B (en) * 2022-06-28 2023-12-22 佛山市精鹰智能装备有限公司 Double-end joint inspection assembly method for screw rod bearing seat
CN116372534B (en) * 2023-05-26 2023-08-01 廊坊精雕数控机床制造有限公司 Ball screw assembly method based on machine tool

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Publication number Priority date Publication date Assignee Title
CN111188842A (en) * 2020-02-17 2020-05-22 邹国华 Automatic pressing device for bearing steel balls
CN111188842B (en) * 2020-02-17 2021-04-27 聊城鲁寰轴承有限公司 Automatic pressing device for bearing steel balls

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