JPH0531607A - Boring processor - Google Patents

Abstract

PURPOSE:To remove an influence of processing quality on a slide portion by reducing a slide freedom degree for processing. CONSTITUTION:Spindle heads 3, 4 that face each other on the same axis, are arranged in fixation at both ends of a bed 1, and a column 10 that reciprocates between both spindle heads 3, 4, is provided on the bed 1. A jig table 11 that fixes a work W, is provided on the column 10.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art A multi-axis boring machine of this type is known, for example, as shown in FIGS. 4 and 5. In this, a pair of slide units 34 and 35 equipped with a spindle head 32 or 33 are arranged on a bed 31 so as to face each other with a jig table 36 in between.
A slide unit 39 including a spindle head 38 is similarly arranged on a gate-shaped column 37 arranged so as to straddle one slide unit 35. In addition,
The axis of the spindle head 38 is offset from the axes of the spindle heads 32 and 33 by a predetermined amount a, as shown in FIG.

Since the workpiece W to be machined is fixed to the jig table 36, the spindle heads 32 and 33 of the horizontally arranged slide units 34 and 35 move forward with respect to the workpiece W, and at the same time, take a vertical posture. By lowering the spindle head 38 of the slide unit 39, boring processing of the work W from three directions is simultaneously performed.

[0004]

In the conventional boring machine as described above, since the spindle heads 32 and 33 of the slide units 34 and 35 in the horizontal position respectively slide, the respective spindle heads 3 are moved.
In addition to thermal expansion in the radial direction due to the rotation of the main shafts 40 and 41 of Nos. 2 and 33, position accuracy errors due to heat generation and wear on the slide guide surfaces of each slide unit 34 and 35 are accumulated. It is difficult to maintain the coaxial accuracy of the spindles 40 and 41 for a long period of time. As a result, the coaxial accuracy of the holes machined by the respective spindles 40, 41 is reduced,
There is a limit to the improvement of processing quality.

Further, in order to eliminate the above-mentioned factors that deteriorate the processing accuracy due to heat, the slide units 34, 35,
A large amount of lubricating oil is also supplied to the sliding portion of 39, but in this case, a cooling device or the like for cooling the lubricating oil must be attached, and the entire device becomes large and complicated. It is not desirable to do.

The present invention has been made based on the above problems, and when performing boring processing with a pair of spindle heads facing each other, particularly, the coaxial precision between the spindles of both spindle heads is maintained for a long period of time. The purpose is to provide a structure that allows.

[0007]

In the boring machine of the present invention, spindle heads facing each other on the same axis are fixedly arranged at both ends of the bed, and a predetermined feed is given to the bed. A column that reciprocates between a processing position by one spindle head and a processing position by the other spindle head is provided, and a jig table for fixing a work is provided on the column.

[0008]

According to this structure, unlike the prior art, the pair of spindle heads is fixed to the bed side, and the column on which the work is fixed moves between the pair of spindle heads, so that the degree of freedom in sliding is as described above. Only one axis of the column. Further, the pair of spindle heads do not move while being fixed to the bed, and the coaxial precision of the spindles of both spindle heads can be easily maintained.

[0009]

1 and 2 are views showing an embodiment of the present invention, in which a slide guide surface 2 is provided at the center of the bed 1 in the longitudinal direction, and slide guide surfaces 2 are provided at both ends of the bed 1.
A pair of spindle heads 3 and 4 are fixed so as to be opposed to each other on the same axis.

The spindle heads 3 and 4 have a housing 5
A cutter 8 is provided at the tip of a main shaft 6 or 7 which is rotatably supported by a shaft.
It is rotationally driven by the spindle motor 9 mounted above.

The column 1 is provided on the slide guide surface 2 of the bed 1.
0 is provided, and the column 10 reciprocates while being guided by the slide guide surface 2 by being fed by a feeding device (not shown).

A jig table 11 for fixing the work W is provided on the column 10, and a spindle head 12 is provided above the jig table 11 in the column 10.
The slide unit 13 including is arranged. The main shaft 14 of the spindle head 12 has a shaft center offset by a predetermined amount b with respect to the shaft centers of the spindle heads 3 and 4, and the spindle head 12 moves up and down when a predetermined feed is given by a feeding device 15. .. Also, the spindle 1
A cutter 16 is provided at the tip of the spindle 4, and the spindle 14 is driven to rotate by a spindle motor 17.

Here, the above-mentioned offset amount b is, as shown in FIGS. 3A to 3C, the machined holes P1 on the workpiece W side.
It matches the offset amount c between P2 and the processed hole P3.

In the boring processing apparatus configured as described above, the workpiece W to be processed is the jig table 1
When firmly fixed to 1, the spindles 6, 7 and 14 of the spindle heads 3, 4 and 12 are simultaneously driven to rotate, and the column 10 is fed so that the column 10 reciprocates along the slide guide surface 2. By moving, the holes P1, P2, P3 of the work W are processed as shown in FIG.

That is, when the column 10 is first moved to either one of the pair of spindle heads 3 and 4, either one of the holes P1 and P2 is machined, and one of the holes P1 and P2 is machined. The column 10 is moved to the other spindle head side after waiting for the completion of the hole processing, whereby the other hole is processed.

Then, in the course of reciprocating movement while the column 10 is guided by the slide guide surface 2 as described above, the spindle head 12 descends and another hole P3 is machined.

As described above, according to this embodiment, the pair of horizontally arranged spindle heads 3 and 4 is fixed and the column 1 is used.
By moving the 0 side, although the machining axis is 3 axes as in the conventional case, the sliding freedom is reduced by 1 axis to 2 degrees of freedom, so that the machining accuracy due to abrasion of the slide guide surface etc. The factor of decrease is reduced, and it becomes easier to maintain the processing accuracy.

In particular, since the pair of spindle heads 3 and 4 arranged opposite to each other remain fixed to the bed 1, they are not affected by the abrasion of the slide guide surface as in the prior art, and both spindle heads 3 and 4 are not affected. 4 spindles 6,7
The coaxial accuracy of each other can be maintained for a long time.

Moreover, even if the slide guide surface 2 guiding the column 10 is worn, this slide guide surface 2
The change in position due to wear of the head changes in the vertical direction, and therefore coincides with the stroke direction of the spindle head 12. Therefore, the positional change due to the wear of the slide guide surface 2 can be absorbed by the correction of the feed stroke of the spindle head 12, and the machining quality of the work W is not affected.

[0020]

As described above, according to the present invention, the spindle heads facing each other on the same axis are fixedly arranged at both ends of the bed, and a predetermined feed is given to the bed, whereby By providing a column that reciprocates between the machining position by the spindle head and the machining position by the other spindle head, and by providing a jig table for fixing the work on the column, the degree of freedom of sliding for machining Is less than the conventional one axis,
The wear on the slide guide surface has less influence on the machining accuracy, and the machining quality is improved.

Further, since the pair of spindle heads arranged opposite to each other is still fixed to the bed, the slide guide surfaces of the spindle head do not affect the coaxial precision of the spindles as in the conventional case, and the spindles, and in turn, the machining. The coaxial accuracy of the drilled holes can be maintained for a long time, and the processing accuracy is improved.

Further, since the pair of spindle heads are of the fixed type as described above, the portion where the lubricating oil needs to be supplied is reduced, and therefore the cooling device for cooling the lubricating oil is also of the minimum necessary size. Therefore, the entire device can be downsized and simplified.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a diagram showing an example of a work to be processed,
(A) is a front view, (B) is a plan view of (A), (C)
Is a right side view of FIG.

FIG. 4 is a front view showing an example of a conventional boring processing device.

FIG. 5 is a right side explanatory view of FIG. 4.

[Explanation of symbols]

 1 ... Bed 2 ... Slide guide surface 3, 4 ... Spindle head 6, 7 ... Spindle 10 ... Column 11 ... Jig table 12 ... Spindle head 13 ... Slide unit W ... Work

Claims (1)

Claim: What is claimed is: 1. A spindle head, which is opposed to each other on the same axis, is fixedly arranged at both ends of the bed, and a predetermined feed is given to the bed, whereby one spindle head is provided. A boring machine, wherein a column that reciprocates between a machining position and a machining position by the other spindle head is provided, and a jig table for fixing a work is provided on the column.