JP2002018611A - Machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent such problem that dimensional errors in a composite component consisting of plural parts cause the failure of the composite component due to the addition of assembly errors to the dimensional errors of each part even if each part has been machined to specified accuracy. SOLUTION: In this machine tool, a turret lathe for machining an axle holding member 50 to which a rotation side holding member 52 is attached rotatably in relation to a fixing side holding member 51 comprises spindle chucks 7, 7, etc., for fixing the fixing side holding member 51, a drive shaft 6 for rotating the rotation side holding member 52, and cutting tools 16 and 17 for performing cutting machining to the rotation side holding member 52.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a machine tool for processing a composite part which is rotatably assembled to each other.

[0002]

2. Description of the Related Art In general, when a composite component is formed by assembling a plurality of components, each component of the composite component is processed and manufactured, and then the manufactured components are assembled. Completing composite parts is being performed. In this case, it is necessary not only to process each component with a certain degree of precision, but also to assemble such that errors such as finished dimensions of a composite part composed of each component fall within a certain range. It is said.

[0003]

The above-mentioned dimensional error in a composite component composed of a plurality of component parts is caused by adding an assembling error and the like to the dimensional error of each component part. However, the dimensions of the entire composite component may deviate from a predetermined standard, resulting in a defective product. Also, in order to ensure that the dimensions of the composite part after assembly are within the standard, each component must be processed with considerably high precision, which makes the processing complicated and increases the processing cost. Will be invited. Therefore,
In the present invention, there is provided a machine tool capable of performing processing in a composite part state after assembling each component part, easily improving the processing accuracy of the composite part, and suppressing occurrence of defective products. Is what you do.

[0004]

The present invention uses the following means to solve the above problems.
That is, according to claim 1, a machine tool for processing a composite component in which a second component is rotatably assembled to a first component, wherein component fixing means for fixing the first component; It is composed of a part rotating means for rotating the second part and a processing means for performing a cutting process on the second part.

According to a second aspect of the present invention, the component rotating means has an engaging portion engageable with an engaged portion of the second component, and the engaging portion is provided with respect to the second component. It is possible to move forward and backward between an engaging position and a retracting position where it does not engage.

According to a third aspect of the present invention, the engaging portion rotates while applying a predetermined pressing force to the second component,
It advances to the advance position with the engagement phases matched.

[0007]

Embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic view showing a turret lathe as an example of a machine tool according to the present invention, FIG. 2 is a side sectional view showing an axle holding part, FIG. 3 is a plan view thereof, and FIG. 5 is a cross-sectional view, FIG. 5 is a side cross-sectional view showing a work gripping portion of the work gripping mechanism, FIG. 6 is a front view thereof, FIG. It is a side sectional view showing a 3rd example of an engaging part engaged with a rotation side holding member.

A schematic configuration of a turret lathe as an example of the machine tool of the present invention will be described. The turret lathe main body 1 shown in FIG. 1 has a spindle base 4 fixedly installed on a frame 3 such as a bed, and the tool support means 5 can be moved forward, backward, left and right (Z direction and X direction) via a tool feed base 18. It was installed in. At one of the front and rear ends of the spindle table 4, there are provided a fixed chuck 7 serving as a work holding means and a seating confirmation piece 8 for detecting the chuck state of the work.

The tool supporting means 5 is a tool rest, which is of a turret type, and has a plurality of tool stations S on the outer periphery. At each tool station S, a tool 16 such as a cutting tool for turning and a rotary tool 17 such as a drill and a milling head are installed via a tool holder. The tool feed base 18 is provided on the frame 3 via a guide 19 so as to be movable left and right (X direction), and is mounted on the feed base 18a so as to be movable back and forth (Z direction). And an upper feed base 18b.

[0010] The turret lathe uses a work to be machined,
This is a composite component in which a second component is rotatably assembled with a first component, and this composite component is, for example, an axle holding component 50 as shown in FIGS. The axle holding part 50 includes a fixed side holding member 51 as a first part.
Further, a rotation-side holding member 52 as a second component is rotatably fitted inside via a bearing 56.
A spline boss 52b is formed on the rotation side holding member 52, and a spline shaft can be fitted to the spline boss 52b.

Next, the structure of the work holding mechanism in the spindle table 4 will be described. As shown in FIGS. 4 to 6, a drive shaft 6 is rotatably supported on a spindle table 4 having fixed chucks 7 provided at one of front and rear ends. A drive sleeve 11 is externally fitted to the drive shaft 6. By fitting a key 12 fixed to the drive shaft 6 into a key groove 11 a of the drive sleeve 11, the drive shaft 6 and the drive sleeve 11 are separated from each other. It is rotatable integrally. The key 12 has a keyway 11a.
The drive shaft 6 is slidably fitted to the drive sleeve 11 in the axial direction.

The drive sleeve 11 is
The spindle 9 is rotatably supported on a spindle base 4 via a spindle 9 which rotates integrally with the spindle 9. The other end of the spindle 9 (the left end in FIG. 4) has a pulley 1
3 is fixed. The pulley 13 includes the pulley 1
A rotational driving force from a driving source is transmitted by a belt 14 wound around 3, and the driving sleeve 11 and the drive shaft 6 are rotationally driven through the spindle 9.

At the other end of the front and rear ends of the spindle 9, there is provided a cylinder 15 which allows the piston 15a to move forward and backward in the direction of the rotation center O of the drive shaft 6. A sliding hole 15b is formed at one of the front and rear ends of the piston 15a from the front and rear end surfaces of the piston 15a toward the other end. Slidably fitted to An urging member 23 is interposed between the other front and rear ends of the sliding hole 15b and the sliding shaft 21, and the urging member 23 urges the sliding shaft 21 toward one of the front and rear ends.

The upper and lower surfaces of the piston 15a where the sliding hole 15b is formed have elongated holes 15c and 15c in the direction of the rotation center O.
c is formed. A pin 2 is inserted into the long holes 15c.
2 is penetrated, and the pin 22 is
Along the center of rotation O. The pin 22 is disposed at one end in the front and rear directions of the sliding shaft 21,
The sliding shaft 21 urged by 3 locks the pin 22. Thus, the sliding range of the sliding shaft 21 in the direction of the rotation center O is the sliding range of the pin 22, that is, the elongated hole 15c-1.
5c. The drive shaft 6 is slidably inserted from one of the front and rear ends of the sliding hole 15b.

An engaging portion 6a formed on a spline shaft having the same diameter as the spline boss 52b of the rotating side holding member 52 is integrally and rotatably mounted at one of the front and rear ends of the drive shaft 6. Also, a plurality of fixed chucks 7, 7... Are provided at one of the front and rear ends of the spindle base 4, and the fixed chucks 7, 7. ing. The fixed chuck 7.7
Can be moved in the radial direction of an arc centered on the rotation center O by the chuck opening / closing mechanism 4a, and can be closed and chucked when moved inward in the radial direction, and opened when moved outward in the radial direction. The chuck state of the work is released.

At the front and rear ends of the spindle base 4, there are further provided a plurality of seating confirmation pieces 8, 8,... Which also have a circular arc centered on the rotation center O. It is configured to be movable in the radial direction. When the fixed chucks 7, 7... Are chucking the work, the seating confirmation pieces 8, 8. Is checked to see if it is normal.

Processing of a workpiece by the present turret lathe having a workpiece gripping portion as described above will be described using the axle holding component 50 as an example. First, the fixed-side holding member 51 of the axle holding part 50 is chucked and fixed by the fixed chucks 7,. In this case, the axle holding component 50 is held in a posture in which the axis of the spline boss 52b of the rotation side holding member 52 and the rotation center O coincide with each other, and the drive shaft 6 is retracted toward the cylinder 15 side.

When the fixed holding member 51 of the axle holding component 50 is held and fixed by the fixed chucks 7, 7...
The piston 15a of the cylinder 15 extends toward one of the front and rear ends. When the piston 15a extends, the sliding shaft 21 comes into contact with the drive shaft 6 via the pin 22, whereby the drive shaft 6 advances toward the axle holding component 50 side. When the drive shaft 6 is advanced, the engaging portion 6a at the distal end has a spline boss 52b of the rotation side holding member 52.
The drive shaft 6 and the rotation-side holding member 52 can be integrally rotated by the engagement between the spline of the engagement portion 6a and the spline boss 52b.

As described above, the engaging portion 6 of the drive shaft 6
When inserting a into the spline boss 52b of the rotation-side holding member 52, the engaging portion 6a is pressed against the rotation-side holding member 52 while rotating the drive shaft 6 at a low speed. That is, the drive shaft 6 is connected to the rotation-side holding member 5.
2, when the phase of the spline of the engaging portion 6a and the phase of the spline boss 52b of the rotation side holding member 52 do not match, the engaging portion 6a is not inserted into the spline boss 52b, Both end faces abut.

In this case, since the engaging portion 6a is pushed forward by the cylinder 15 toward the spline boss 52b, it comes into contact with the end face of the spline boss 52b in a pressed state. When the phase of the spline of the engaging portion 6a matches the phase of the spline boss 52b due to the rotation of the drive shaft 6 in a state where the engaging portion 6a is pressed against the end face of the spline boss 52b, the pressing force causes the engaging portion 6a. 6a is inserted into the spline boss 52b.

The drive shaft 6 is connected to the cylinder 15
The piston 15a is pressed toward the spline boss 52b via the sliding shaft 21 urged by the urging member 23, and the piston 15a advances when the drive shaft 6 contacts the rotation side holding member 52. Can be extended against the urging force of the urging member 23 even after stopping. The pressing force of the drive shaft 6 abutting on the rotation-side holding member 52 against the rotation-side holding member 52 corresponds to the urging force of the urging member 23.

Here, the rotating side holding member 52 is constructed by rotatably fitting the rotating side holding member 52 to the fixed side holding member 51 as described above. Since there is a predetermined amount of sliding resistance between the holding member 52 and the holding member 52, the rotation-side holding member 52 is
, It is necessary to apply a rotational force of a fixed value or more to the rotation side holding member 52. Conversely, when only a force smaller than a certain value is applied, the rotation-side holding member 5
2 does not rotate.

As described above, when the pressing force of the drive shaft 6 on the rotation side holding member 52 is larger than a predetermined value, the rotation side holding member 52 rotates integrally with the drive shaft 6. However, the drive shaft 6 is connected to the rotation-side holding member 5.
2 and the two splines must be in phase with each other. Therefore, the urging member 23 is pressed so that the pressing force of the drive shaft 6 on the rotation-side holding member 52 becomes smaller than a predetermined value. The biasing force is adjusted so that the rotation-side holding member 52 does not rotate with the drive shaft 6.

As described above, after the engagement portion 6a is inserted into the spline boss 52b and the drive shaft 6 and the rotation-side holding member 52 can be integrally rotated, the rotation speed of the drive shaft 6 is increased. Then, the rotation-side holding member 52 is rotated at the rotation speed at the time of processing. Then, the surface to be processed 52a (shown in FIG. 5) of the rotating rotating side holding member 52 is processed by the tools 16 and 17 mounted on the tool support means 5 selected as appropriate.

The engaging portion 6a that engages with the rotation-side holding member 52 to rotate the rotation-side holding member 52 may be configured as shown in FIG. That is, the tailstock 26 supporting the axle holding component 50 from the opposite side of the fixed chucks 7 is rotatably driven, and the tip end 26a of the tailstock 26 is connected to the spline boss 52b of the rotation side holding member 52. Formed on the spline shaft having the same diameter as
The rotation side holding member 52 may be configured to be rotated by inserting a into the spline boss 52b.

Further, a rotating chuck 66 shown in FIG. 8 can be used as an engaging portion for rotating a work such as the rotating side holding member 52. For example, the rotary chuck 66 is configured by rotatably assembling a rotary side holding member 59 with respect to the fixed side holding member 58, and a rotation center O is provided at an end of the rotary side holding member 59 on the side opposite to the fixed chuck 7.
It can be used when processing the axle holding part 57 in which the fitting hole 59a which does not penetrate in the direction is formed. That is, the rotary chuck 66 is advanced to the spindle table 4 side, and the fitting portion 66a at the tip of the rotary chuck 66 is
And the rotary chuck 66 is rotationally driven. As described above, by rotating the rotary chuck 66, the frictional force between the fitting hole 59a and the fitting portion 66a allows the rotary chuck 66 and the rotating side holding member 59 to rotate integrally. Becomes

As described above, the fixed-side holding member 51 is held and fixed by the fixed chucks 7, 7..., And the rotation-side holding member 52 is rotated by the drive shaft 6, so that the processing surface of the rotation-side holding member 52 is processed. By processing the 52a with the tools 16 and 17 as processing means, for example, the parallelism between the reference surface 51c of the fixed-side holding member 51 and the processing surface 52a of the rotating-side holding member 52 can be improved. Dimensions can be processed with high accuracy. As a result, the processing accuracy of the axle holding component 50 formed by assembling the fixed-side holding member 51 and the rotation-side holding member 52 can be easily improved, and the occurrence of defective products can be suppressed.

As described above, the drive shaft 6 for rotating the rotation-side holding member 52 is provided with the engagement portion 6a that engages with the rotation-side holding member 52. The engagement portion 6a In addition to being able to advance and retreat in the front-rear direction integrally with the drive shaft 6, it can be urged by the urging member 23 and pressed against the rotation-side holding member 52. Accordingly, the phase of the spline of the engagement portion 6a and the phase of the spline boss 52b of the rotation-side holding member 52 are matched with a simple configuration without separately providing a special mechanism.
Can be easily engaged with the rotation-side holding member 52.

The rotating side holding member 52 of the engaging portion 6a
Is adjusted so that the rotation-side holding member 52 does not rotate with the engagement portion 6a, so that the phase of the engagement portion 6a and the phase of the rotation-side It is possible to shorten the processing time of the axle holding part 50 and to improve the precision of the processing operation.

[0030]

According to the present invention having the above-described configuration, the following effects can be obtained. First, as in claim 1,
A machine tool for processing a composite component in which a second component is rotatably assembled to a first component, component fixing means for fixing the first component, and component rotating means for rotating the second component. Since it is constituted by the processing means for performing cutting processing on the second part, it is possible to process the composite part after the first part and the second part are assembled, and the composite part itself can be processed. Processing accuracy can be easily improved, and occurrence of defective products can be suppressed.

Further, the component rotating means has an engaging portion capable of engaging with the engaged portion of the second component.
The engaging portion can be moved back and forth between an advanced position where it engages with the second component and a retracted position where it does not engage. Therefore, the phase of the engaging portion can be easily determined without providing a special mechanism. By matching the phase of the second component and the phase of the second component, the engaging portion can be easily engaged with the second component.

Furthermore, the engaging portion rotates while applying a predetermined pressing force to the second component, and advances to the advanced position with the engagement phase matched, so that the engaging portion is quickly and reliably. The phase of the engaging portion and the phase of the second component can be matched to each other, so that the processing time of the composite component can be reduced and the precision of the processing operation can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a turret lathe as an example of a machine tool according to the present invention.

FIG. 2 is a side sectional view showing an axle holding part.

FIG. 3 is a plan view of the same.

FIG. 4 is a side sectional view showing a work holding mechanism in a spindle base.

FIG. 5 is a side cross-sectional view showing a work holding portion of the work holding mechanism.

FIG. 6 is a front view of the same.

FIG. 7 is a side cross-sectional view showing another embodiment of the engaging portion that engages with the rotation-side holding member.

FIG. 8 is a side cross-sectional view showing a third embodiment of an engagement portion that engages with a rotation-side holding member.

[Explanation of symbols]

 Reference Signs List 4 spindle stand 6 spindle 6a engaging part 7 fixed chuck 15a piston 50 axle holding part (composite part) 51 fixed side holding member (first part) 52 rotating side holding member (second part)

Claims (3)

[Claims] 1. A machine tool for processing a composite component in which a second component is rotatably assembled with a first component.
A machine tool comprising: component fixing means for fixing the first component; component rotating means for rotating the second component; and processing means for performing a cutting process on the second component. 2. The component rotating means has an engaging portion engageable with an engaged portion of a second component, and the engaging portion is at an advanced position for engaging with the second component. The machine tool according to claim 1, wherein the machine tool can move forward and backward to a retracted position that does not engage with the machine tool. 3. The device according to claim 2, wherein the engaging portion rotates while applying a predetermined pressing force to the second component, and advances to the advanced position in accordance with an engaging phase. Machine Tools.