KR20090053990A - Sub-spindle back lash control device of complex tools - Google Patents

Abstract

The present invention relates to a sub-axis backlash adjustment device of a multi-task machine.

The sub-axis backlash adjustment device of the multi-task machine according to an embodiment of the present invention is rotatably mounted on the main body 10, and a plurality of cam followers 21 are disposed on the outer circumferential surface at equal intervals, and the sub-axis inside Rotary shaft 20, cam shaft 30 having a spiral cam tooth that is disposed rotatably on the main body 10 so that the axis and the rotary wheel 20 and the axis is orthogonal and in contact with the plurality of cam follow 21 ), The inner circumferential surface 102 is in contact with the outer ring of the bearing 60 and the bearing 60 disposed above and below the cam shaft 30, and the center Ci of the inner circumferential surface 102 is the center of the outer circumferential surface 103. And bearing housings 100a and 100b which are eccentric (r) at Co and displace the cam shaft 30 toward the rotary wheel 20 to remove backlash.

Multi-task machine, machine tool, lathe, backlash, B axis, eccentric

Description

Sub-spindle back lash control device of complex tools

The present invention relates to a sub-axis backlash adjustment device of a multi-task machine, and more particularly, to a sub-axis index accuracy by eliminating the backlash generated when the sub-axis is indexed. It relates to a sub-axis backlash adjustment device.

In general, the multi-task machine 1 is composed of a plurality of shafts inside the cabinet, as shown in Figures 1 and 2, a tool or a workpiece is mounted on the shaft will be described in more detail with reference to the accompanying drawings.

The first headstock 3a and the second headstock 3b are mounted in front of the bed 2, and a work piece may be mounted in the first and second headstock 3a, 3b, and in particular, the second headstock 3a and 3b. As shown in FIG. 2, the headstock 3b may be reciprocated in the A direction, a tool post may be mounted below the first spindle 3a, and the tool post may be reciprocated in the X2 and Z2 directions. .

In addition, a carriage 7 may be disposed above the bed 2 to move in the Ys direction and the Z1 direction, and an X-axis slider 8 may be mounted on the upper side of the carriage 7. (8) is equipped with a milling spindle 5 can be reciprocated in the X1 direction.

In addition, the milling spindles 5 are configured with a B axis and can be indexed by an index command.

In addition, an automatic tool changer 6 may be disposed at the rear side of the above-described bed 2, and the automatic tool changer 6 may automatically exchange and mount a tool on the milling spindle 5 described above. .

That is, the workpiece is rotated while the workpiece is mounted on the first spindle 3a or the second spindle 3b, and turning is performed by using a tool selected from the tool spindle, and the first and second spindles 3a. (3b) is stopped, the milling spindle 5 is moved to the left and right, up and down directions by the X-axis slide 8 and the carriage 7, so that the workpiece is subjected to the surface machining, key groove processing, hole processing, etc. do.

In particular, the B-axis of the milling spindle 5 is indexed by the indexing device so that the workpiece can be processed in different directions according to the intention of the designer. The conventional indexing device is made while rotating the rotary wheel 20 at a predetermined angle.

The above-mentioned conventional index apparatus will be described with reference to FIG. 3.

The rotary wheel 20 is rotatably mounted at the center of the main body 10, and the B axis is disposed concentric with the rotary wheel 20.

In addition, a plurality of cam followers 21 are disposed on the outer circumferential surface of the rotary wheel 20 at equal intervals.

The cam follower 21 described above may be a kind of cam roller, and the cam follower 21 may serve as a gear of a worm wheel.

In addition, the cam shaft 30 is disposed on the other side of the main body 10 described above, the cam shaft 30 is mandrel mounted by the bearing housings 40a, 40b and the bearing 60.

In addition, the above-described camshaft 30 is a kind of worms can be formed teeth and each tooth is a continuous shape in the form of a spiral, but for convenience of description a plurality of cam teeth 31, 32, 33 ( 34) will be described.

In addition, the above-described cam shaft 30 is not shown in detail, but receives the driving force of the drive motor rotates forward or reverse.

That is, the plurality of cam followers 21 described above are disposed between the plurality of cam teeth 31, 32, 33, 34, and the rotary wheel 20 is rotated by the rotation of the cam shaft 30. It will rotate forward or reverse.

However, a backlash occurs due to a mechanical machining error or an error in the machine assembly process. This backlash moves when the index is converted to reverse rotation during forward rotation or forward rotation during reverse rotation. There is a problem that this error adversely affects the precision of the index and the workpiece cannot be precisely processed when indexing the B axis.

In order to solve the above problems, a conventional backlash adjusting device is provided. As shown in FIG. 3, a female screw 41 is formed on the inner circumferential surface of the bearing housings 40a and 40b, and the female screw 41 is provided. The cap bolt 50 is fastened to the structure.

The process of removing the backlash by the above-described conventional backlash adjusting device will be described with reference to FIG. 4.

FIG. 4A is an exemplary view showing a state before backlash adjustment and FIG. 4B is an exemplary view showing a state after backlash adjustment.

As shown in FIG. 4A, when the rotary wheel 20 and the cam shaft 30 are engaged with each other and the cam shaft 30 rotates forward, a part of the cam follow 21 of the plurality of cam followers 21 is rotated. The cam follower 21 rolls while the lower side of the cam teeth 31, 32, 33, 34 is in line contact with the upper side of some cam teeth 33, 34. 20 is rotated.

However, as described above, when the cam shaft 30 is reversely rotated, the upper side of the plurality of cam followers 21 and the lower side of the plurality of cam teeth 31, 32, 33, 34 are in line contact with each other. Since the precision decreases due to the backlash, the adjustment is made to remove the backlash.

The conventional backlash adjusting device moves the camshaft 30 in the axial center direction of the camshaft 30 by tightening or releasing the cap bolt 50 described above, and as an example, in the direction of the arrow shown in FIG. Can be moved.

As shown in (b) of FIG. 4, when the cam shaft 30 is moved, a larger number of cam followers 21 and cam teeth 31, 32, 33, 34 are in line contact. When the cam shaft 30 is moved in the direction of the arrow of FIG. 4 (b), the parts where the plurality of cam followers 21 and cam teeth 31, 32, 33, 34 are in contact with each other will be described in more detail. Fine gaps are formed in the first and third contact portions t1 (t3) and t5, and the second and fourth contact portions t2 (t4) and t6 are completely in contact with each other.

Therefore, as described above, the conventional backlash adjusting device can mitigate the backlash in removing the backlash, but still a minute gap is formed, which may affect the index precision when switching to the forward or reverse rotation, and eventually the workpiece There is a problem that adversely affects the processing precision of the.

In addition, since the backlash is present due to the minute gap described above, there is a problem in that the response of the rotary wheel 20 to the driving of the cam shaft 30 is slowed by the gap of the backlash.

Accordingly, the technical problem to be achieved by the present invention is to move the cam shaft toward the rotary wheel, but the cam follower of the rotary wheel is brought into close contact with both opposing surfaces of the cam tooth based on an imaginary repair line connecting the camshaft centerline at the center of the rotary wheel. It is an object of the present invention to provide a sub-axis backlash adjusting device for a multi-task machine that can remove lash.

Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.

The sub-axis backlash adjusting device of the multi-task machine according to an embodiment of the present invention for achieving the above technical problem, is rotatably mounted on the main body, a plurality of cam follower is arranged on the outer peripheral surface at equal intervals and the sub-axis inside Rotary wheel is disposed; A cam shaft rotatably disposed on the main body such that the axis of the rotary wheel is perpendicular to the axis and having a spiral cam tooth in contact with the plurality of cam followers; Bearings disposed above and below the camshaft; And a bearing housing in which an inner circumferential surface is in contact with the outer ring of the bearing, and a center Ci of the inner circumferential surface is eccentrically r at the center Co of the outer circumferential surface to displace the cam shaft toward the rotary wheel to remove backlash. Include.

In addition, the inner circumferential surface may be in contact with the outer circumferential surface of the bearing housing, and the outer circumferential surface may be further included in contact with one inner circumferential surface of the main body 10;

In addition, the eccentric r may be 1.5mm to 2.5mm.

Specific details of other embodiments are included in the detailed description and the drawings.

The apparatus for adjusting the sub-axis backlash of the multi-task machine according to an embodiment of the present invention made as described above has a plurality of cam followers and camtoses on the upper and lower sides based on an imaginary repair line connecting the centerline of the camshaft to the center of the rotary wheel. The backlash is eliminated by close contact, so that the camshaft can be responsive when the camshaft switches from forward rotation to reverse rotation or forward rotation to forward rotation, thereby improving machining accuracy when indexing milling spindles.

Advantages and features of the present invention, and methods for achieving them will be apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings.

Throughout the specification, the same reference numerals refer to the same components, the same reference numerals are assigned to the same components as the conventional components, and detailed description thereof will be omitted.

Hereinafter, the sub-axis backlash adjustment device of the multi-task machine according to the embodiment of the present invention will be described with reference to FIGS. 5 to 7.

5 is an exemplary view for explaining a sub-axis backlash adjustment apparatus of a multi-task machine according to an embodiment of the present invention, Figure 6 is a sub-axis backlash adjustment apparatus of a multi-task machine according to an embodiment of the present invention 7 is a cross-sectional view for explaining, Figure 7 is a view for explaining the bearing housing in the sub-axis backlash adjustment apparatus of the multi-task machine according to an embodiment of the present invention.

As shown in FIG. 5, a drive motor 36 is disposed on one side of the main body 10, a driving force of the drive motor 36 is transmitted to the driven gear 35, and the driven gear 35 is the cam shaft 30. Motorized).

In addition, the rotary wheel 20 is rotatably disposed on the main body 10 described above, and in particular, the axis of the rotary wheel 20 and the axis of the cam shaft 30 are arranged in a direction perpendicular to each other.

The cam follower 21 is disposed at equal intervals on the outer circumference of the rotary wheel 20 described above, and the camshaft of the spiral is formed in the camshaft 30 described above.

That is, the rotary wheel 20 and the cam shaft 30 are configured similarly to the configuration in which the worm wheel and the worm are coupled.

In particular, the bearing 60 may be disposed above and below the cam shaft 30, and the bearing housings 100a and 100b may be disposed outside the bearing 60.

In the above-described bearing 60, the inner ring is fixedly mounted on the outer circumferential surface of the camshaft 30, and the outer ring of the bearing 60 is fixedly mounted on the inner circumference of the above-described bearing housings 100a and 100b.

In addition, the above-mentioned bearing housings 100a and 100b may have female threads 101 formed on the inner circumference thereof, and the cap bolts 50 may be fastened to the female screws 101.

In addition, the main housing 120 may be further disposed outside the bearing housing 100b, and the cover 70 may be further disposed outside the main housing 120.

The main housing 120 described above may be fastened and fixed to one side of the main body 10 described above, and the cover 70 may prevent foreign substances from flowing from the outside.

The aforementioned bearing housings 100a and 100b will be described in more detail with reference to FIG. 7.

As shown in FIG. 7, in the bearing housings 100a and 100b, the center Co of the outer circumferential edge 103 and the center Ci of the inner circumferential edge 102 may not coincide with each other, and an eccentric r may be formed at a predetermined distance. Can be

The above-described distance of the eccentric r may be 0.5 mm to 3 mm, and more specifically 1.5 mm to 2.5 mm.

The above-described eccentricity r must be 0.5 mm or more to generate deviation as an eccentricity, and 3 mm or less to minimize the tolerance of the mechanical configuration and can be machined within the allowable tolerance range of the entering angle.

In addition, the above-described eccentric r generates a difference between the minimum thickness s1 and the maximum thickness s2 of the bearing housings 100a and 100b. As described above, when the eccentricity r is 3 mm or less, the minimum thickness s1 and the maximum thickness ( The difference between s2) is less than 6mm.

In addition, a machining surface 104 may be formed outside the bearing housings 100a and 100b described above, and the machining surface 104 serves as a key groove when the bearing housings 100a and 100b are rotated. By using a tool to rotate the bearing housing 100a (100b) more easily.

In addition, as shown in FIG. 8, a reference groove 105 may be further formed on one outer circumferential surface of the bearing housings 100a and 100b, and the reference pin hole 106 may be formed in the main housing 120. Can be formed.

The above-described reference groove 105 provides a convenience when setting the reference in the state before adjusting the backlash as shown in FIG. 8 (a). The reference groove 105 and the reference pin hole 106 are provided with a pin. In the foiled state, the backlash generated between the rotary wheel 20 and the cam shaft 30 is measured, and the bearing housings 100a and 100b are rotated based on the measured values.

Hereinafter, the operation of the sub-axis backlash adjustment device of the multi-task machine according to an embodiment of the present invention will be described with reference to FIGS. 8 and 9.

As an example, in the state in which the rotary wheel 20 and the cam shaft 30 are assembled to the main body 10, the clearance of the backlash is measured by using a measuring instrument such as an indicator, and the bearing housing ( Calculate how much to rotate 100a) and 100b).

On the other hand, the backlash can be removed while rotating the bearing housings 100a and 100b repeatedly without measuring with a measuring instrument.

As an example, when the above-described eccentricity r is 2 mm, the component x1 in which the cam shaft 30 moves in the rotary wheel 20 direction and the component y1 in which the cam shaft 30 moves in the vertical direction will be described. The correlation of) is as follows.

As shown in Table 1 and FIG. 2, the component x1 in which the camshaft 30 moves in the direction of the rotary wheel 20 is 0.0349 mm or more as the rotation angle a changes from 1 kPa to 7 kPa. It can be seen that the component y1 in which the cam shaft 30 moves in the vertical direction is changed from 0.2437 mm to 0.0003 mm to 0.0149 mm, which is a very small change.

Therefore, it can be used to adjust the backlash by the component x1, which is a transverse component necessary for moving the cam shaft 30, and the component y1, which is a longitudinal component, can be ignored.

On the other hand, when the required distance of the above-described horizontal component (x1) is determined, it is possible to calculate the rotation angle (a) by inversion, thereby enabling the cam shaft 30 to be precisely moved.

In particular, in rotating the bearing housing (100a) (100b) the cam shaft 30 is moved in the horizontal direction will be described in detail with reference to FIG.

FIG. 9A shows a state before the backlash is adjusted, and FIG. 9B is an exemplary view showing the state after the backlash is adjusted.

As shown in FIG. 9B, the cam shaft 30 is moved in the direction of the arrow (horizontal direction) and thus transversely so that the cam shaft 30 can approach the rotary wheel 20 or be pushed in the opposite direction. .

For example, when the eccentricity r is made upward in the bearing housings 100a and 100b as shown in FIG. 8, the cam shaft 30 is rotated when the bearing housings 100a and 100b are rotated counterclockwise. When the rotary wheel 20 is approached and rotated clockwise, the cam shaft 30 moves away from the rotary wheel 20.

On the other hand, in the bearing housings 100a and 100b, the eccentric r may be made downward, in which case the cam shaft 30 rotates the rotary wheel when the bearing housings 100a and 100b are rotated counterclockwise. 20 is accessible.

As described above, as the cam shaft 20 is moved in the horizontal direction, the cam follower 21 and the cam tooth disposed on the rotary wheel 20 come into close contact with each other, which is illustrated in FIG. 9B. This will be described in more detail with reference.

After the backlash is adjusted, the thirteenth and fourteenth contact portions t13 are disposed in a lower direction in which the eleventh and twelfth contact portions t11 and t12 are in contact with each other and are approximately symmetric with respect to the center of the rotary wheel 20. (14).

In particular, when the rotary wheel 20 and the cam shaft 30 are assembled in a plan view, when the center line of the cam shaft 30 is repaired at the center of the rotary wheel 20, the upper and lower sides of the rotary wheel 20 are based on the repair. Cam follow 21 and cam teeth 31, 32, 33, 34 are in contact with each other in a symmetrical form.

When the cam shaft 30 is rotated forward, the cam teeth 31 and 32 disposed above and the cam follower 21a and 21b are in line contact with each other. When the cam shaft 30 rotates in reverse, The cam teeth 33 and 34 disposed below and the cam followers 21d and 21e can be in line contact, and the backlash is removed.

Therefore, when the cam shaft 30 switches from forward rotation to reverse rotation or from reverse rotation to forward rotation, the forward and reverse directions are immediately changed, and accordingly, the rotary wheel 20 is immediately responded according to the driving force of the cam shaft 30. Responsiveness is excellent.

As described above, since the rotary wheel 20 can move immediately according to the driving of the cam shaft 30, the accuracy of the index is improved when the sub-axis is indexed.

The above-described bearing housings 100a and 100b may be rotated at a predetermined angle and then held in a fixed position by a fastening means such as a conventional set screw.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. will be.

Therefore, the embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is represented by the following detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

The apparatus for adjusting the sub-axis backlash of the multi-task machine according to an embodiment of the present invention may be applied to a multi-task machine, in particular, to an axis in which an indexing operation is performed, such as a sub-axis, and when the indexing operation is performed, the cam shaft is reversed in forward rotation. When switching from rotation or reverse rotation to forward rotation, responsiveness is improved and machining accuracy can be improved.

1 is an exemplary view showing a multi-task machine.

2 is an exemplary view for explaining an axis constituting a composite machine in a composite machine.

3 is a planar cross-sectional view illustrating a conventional backlash adjustment device.

4 is an exemplary view for explaining an operation example of a conventional backlash adjustment device.

5 is an exemplary view for explaining a sub-axis backlash adjustment device of a multi-task machine according to an embodiment of the present invention.

6 is an exemplary cross-sectional view for explaining a sub-axis backlash adjustment device of a multi-task machine according to an embodiment of the present invention.

7 is a view for explaining the bearing housing in the sub-axis backlash adjustment apparatus of the multi-task machine according to an embodiment of the present invention.

8 is a view for explaining the backlash adjustment in the sub-axis backlash adjustment apparatus of the multi-task machine according to an embodiment of the present invention.

9 is an exemplary view for explaining an operation example of the sub-axis backlash adjustment device of the multi-task machine according to an embodiment of the present invention.

(Explanation of symbols for the main parts of the drawing)

1: compound machine 2: bed

3a, 3b: 1st and 2nd headstock 4: Chuck

5: milling spindle 6: automatic tool changer

7: carriage 8: X-axis slider

10: main body 20: rotary wheel

21: Follow cam 30: Cam shaft

31, 32, 33, 34: camtooth 40a, 40b: bearing housing

41: internal thread 50: cap bolt

51: external thread 60: bearing

70: cover

100a, 100b: Bearing housing 101: Female thread

102: inner circumference 103: outer circumference

104: machining surface 105: reference groove

106: reference pin hole 120: main housing

Claims (2)

A rotary wheel 20 rotatably mounted to the main body 10 and having a plurality of cam followers 21 disposed on the outer circumferential surface at equal intervals and having a sub axis disposed therein; A cam shaft (30) rotatably disposed on the main body (10) such that the axis of the rotary wheel (20) is perpendicular to the axis and having a spiral cam tooth in contact with the plurality of cam followers (21); A bearing (60) disposed above and below the cam shaft (30); And The inner circumferential surface 102 is disposed in contact with the outer ring of the bearing 60, and the center Ci of the inner circumferential surface 102 is eccentrically r at the center Co of the outer circumferential surface 103 such that the cam is rotated toward the rotary wheel 20. Bearing housings 100a and 100b which displace the shaft 30 to remove backlash; Sub-axis backlash adjustment device of the multi-task machine comprising a. The method of claim 1, An inner circumferential surface in contact with an outer circumferential surface 103 of the bearing housings 100a and 100b, and an outer circumferential surface in contact with one inner circumferential surface of the main body 10; Sub-axis backlash adjustment device of the multi-task machine further comprising.

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