JPH0711843Y2 - Lead turner unit - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lead turner unit which is attached to an X-axis slide stand of a machine tool to perform lead processing on a work.

(Prior Art) A slide device including a bite mounting slide and a slide base is attached to an X-axis slide base of a machine tool, a bite is attached to the slide side of the slide device, and a screw shaft is screwed to rotate by a drive means. In the conventional lead turner unit that moves and moves the bite mounting slide back and forth to lead the work, the slide base of the slide device is fixed to the X-axis slide base via a relatively thin spacer, and the bite mounting slide is also used. The bite mounting slide and the slide base are formed so that the ratio L '/ W' of the sliding portion length L'to the sliding portion width W'is less than 1 time.

Also, one of the screw shafts using a ball screw is connected to the output shaft of the servo motor, which is the driving means, via a coupling, and the connecting side of this screw shaft is connected to the slide base by a bearing of the coupling base. I was supporting.
This bearing has a double row of angular contact ball bearings, the outer ring of which is fixed so that it cannot slide on the coupling base, and the shaft of which is fixed on the inner ring so that it cannot slide. It was a means to prevent movement. On the other hand, the opposite side of the screw shaft, which is the machining side of the work, was free.

(Problems to be solved by the invention) However, in this conventional lead turner unit,
Since the slide device is attached via the spacer, the rigidity is weak, and the length L'of the sliding part of the bite mounting slide is shorter than the width W'of the sliding part.
There was a problem that meandering due to a minute gap when the bite mounting slide slides was exposed to the bite cutting edge, and the processing accuracy deteriorates ( Ratio of distance L1 'and L'
In the conventional L1 '/ L', it was about 0.8 times, and the meandering of the bite mounting slide was about 0.8 times and was transmitted to the cutting edge of the tool).

Also, since the screw shaft is cantilevered, there is a difference in dynamic accuracy between the pushing side and the pulling side, and a coupling is formed between the position on which the upper screw shaft is supported and the output shaft of the drive means. Due to the interposition, the concentricity of these three members cannot be accurately obtained, and therefore, there is a problem that the screw shaft is swung and the bite mounting slide meanders.

Further, there is a problem that the screw shaft expands in the axial end direction close to the workpiece machining without the support shaft due to thermal expansion of the screw shaft due to temperature change during machining, which deteriorates machining accuracy.

(Means for Solving the Problems) The present invention has been made to solve the conventional problems. The rigidity of the slide device is large, and meandering due to a minute gap during sliding of the bite mounting slide causes the cutting edge of the cutting tool. It is possible to make the dynamic accuracy of the pushing side and the pulling side of the screw shaft uniform, and to easily match the shaft center of the screw shaft and the output shaft of the drive means. (EN) Provided is a lead turner unit capable of allowing elongation due to expansion of a screw shaft to escape to a shaft end on the non-working side of a work, thereby improving the working accuracy of the work.

The main points are: 1) A slide base is fixed to an X-axis slide base of a machine tool via a spacer, and a screw shaft is screwed to a bite mounting slide slidably attached to the slide base. In the lead turner unit in which the screw shaft is rotated by the drive means connected to the work piece via the coupling to move the tool attachment slide back and forth, and the work piece is lead-processed, the side closer to the work piece of the screw shaft. An output shaft of the drive means by axially supporting a certain drive means non-connecting side and providing a coaxial shaft supporting means for preventing axial movement of the screw shaft, and further integrally forming a coupling portion on the drive means connecting side of the screw shaft. Directly, and the coupling part is axially supported by a bearing that does not prevent movement of the screw shaft in the axial direction.
The bite mounting slide and slide base are formed so that the ratio L / W of the sliding part length L and the sliding part width W of the bite mounting slide is 1 or more, and the slide base is mounted directly on the X-axis slide base. Lead turner unit characterized by being fixed 2) Sliding part length L and sliding part width W of the bite mounting slide
The lead turner unit according to claim 1, wherein a ratio L / W with the ratio is 1.5.

(Operation) In the present invention, the slide base of the lead turner unit is directly fixed to the X-axis slide, and the sliding portion length L of the bite mounting slide is increased so that the ratio L / W with the sliding portion width W is L / W.
The bite mounting slide and slide base are formed to a size of 1.5.

Further, the screw shaft is pivotally supported on the near side of the work, and the coaxial support portion is provided with a means for preventing axial movement of the screw shaft. Further, a coupling portion is integrally formed on the driving means coupling side of the screw shaft, the coupling portion is coupled to the driving means, and the coupling portion is pivotally supported by a bearing that does not prevent axial movement.

Therefore, this slide base is integrated with the X-axis slide to increase the rigidity, and the ratio L1 / L of the distance L1 and L from the sliding part end near the bite side of the bite mounting slide to the cutting edge is 0.55. Therefore, the meandering due to the minute gap of the bite mounting slide can be reduced to half.

In addition, since the screw shaft is supported at both ends and the axis of the drive means coupling side is also aligned, the screw shaft is not swung around and vibration is not applied to the cutting tool. Further, when the temperature of the screw shaft changes during processing and the screw shaft thermally expands, the expansion of the screw shaft extends in the connecting side direction, so that the side close to the work is hardly affected. In this way, since the adverse conditions at the time of lead processing of the work can be eliminated, the work can always be processed accurately, and the product yield can be greatly improved.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In one embodiment shown in FIGS. 1 to 3, a ball screw is attached to a screw shaft,
Further, this is an example in which a servo motor is used as the driving means.

In the embodiment, the bite mounting slide (1) is slidably mounted on the slide base (3) directly fixed to the X-axis slide base (2) of the NC lathe, and the sliding portion has the same length L as the sliding portion. The bite mounting slide (1) and slide base (3) are formed to have a ratio L / W to the width W of 1.5. At the work-side tip (4) of the same bite mounting slide (1), a set of angular contact ball bearings (5) is installed as axial bearing movement prevention means (6) that also serves as a bearing. The stepped portion (7) and the other end side thereof are pressed by the bearing retainer (8) to prevent the angular contact ball bearing (5) from sliding inside. In addition, a motor base (11) with a built-in ball bearing (10) is provided at the rear end (9) of the bite mounting slide (1) on the side opposite to the work, and the bearing set hole (12) is stepless. The outer ring of (10) is free.

The screw shaft (13) has a work-side tip portion (14) pivotally supported on the angular contact ball bearing (5), and the tip is screwed with a nut (15) to fix the shaft end in a non-slidable manner.
On the other hand, a coupling part (16) is integrally formed at the rear end part of the same screw shaft (13) on the side opposite to the work, and the coupling part (16) is axially supported by a ball bearing (10) and is also a servomotor drive. It is inserted into the output shaft (18) of the means (17) and is keyed. It should be noted that a set bolt or the like is not used in this insertion portion, but the extension due to the thermal expansion of the screw shaft (13) in the axial direction is absorbed.

A female screw portion (19) of a ball screw fixed to the bite mounting slide (1) is screwed onto the screw shaft (13) and slid. The bite (20) is attached to the side surface of the bite mounting slide (1).

4 to 6 show a conventional structure of a lead turner unit, in which the screw shaft (13) is supported only within the motor base (11), and a single coupling (3
It is connected to the output shaft (18) via 0). The screw shaft (13) is free from the drive means non-connecting side (31). Also, slide base (3) is spacer (3
It is attached to the X-axis slide stand (2) via 2).

Although the embodiment of the present invention has been described above, the specific configuration of the present invention is not limited to this embodiment.

For example, although the angular contact ball bearing (5) and the ball bearing (10) are used as the bearings that support the screw shaft (13), the bearings of other shapes may be used instead.

(Effect of the Invention) As described above, according to the present invention, since the slide base of the lead turner unit for processing the lead on the work is directly attached to the X-axis slide base, the rigidity can be increased and the slide of the bite attachment slide can be slid. Since the moving part base length is increased and the rear end of the screw shaft is directly connected to the output shaft, it is possible to reduce the meandering due to the minute gap of the bite mounting slide and the wobbling due to the runout of the screw shaft. Since the side ends are fixed, they support both ends and reduce the dynamic accuracy of the push side and pull side of the screw shaft, and allow the expansion of the screw shaft due to thermal expansion to escape to the rear end of the screw shaft, which has little effect on machining. Therefore, the work can be accurately processed. Moreover, the structure is simple and can be assembled accurately.

[Brief description of drawings]

1 is a partially cutaway side view of an embodiment of the present invention, FIG. 2 is a plan view thereof, FIG. 3 is a front view thereof, FIG. 4 is a partially cutaway side view of a conventional structure, and FIG. A plan view and FIG. 6 are front views of the same. (1): Tool mounting slide, (2): X-axis slide base (3): Slide base (5): Angular contact ball bearing (6): Axial movement prevention means (7): Stepped part, (8 ): Bearing retainer (10): Ball bearing, (11): Motor base (12): Bearing set hole, (13): Screw shaft (14): Work end, (15): Nut (16): Cup Ring part, (17): Driving means (18): Output shaft, (19): Female thread part

Claims (2)

[Scope of utility model registration request] 1. A slide base is fixed to an X-axis slide base of a machine tool via a spacer, and a screw shaft is screwed to a bite mounting slide slidably attached to the slide base.
In a lead turner unit in which the screw shaft is rotated by a drive means connected to one of the screw shafts via a coupling to advance and retract the bite mounting slide, and a work piece is lead-machined, The side opposite to the driving means, which is the side closer to the workpiece, is axially supported, and the coaxial support portion is provided with means for preventing axial movement of the screw shaft, and the coupling portion is integrally formed on the driving means connection side of the screw shaft. The coupling portion is directly connected to the output shaft of the driving means, and the coupling portion is rotatably supported by a bearing that does not prevent the axial movement of the screw shaft, and the sliding portion length L and the sliding portion width W of the bite mounting slide are set. Ratio of L /
A lead turner unit characterized in that a bite mounting slide and a slide base are formed so that W is 1 or more, and the slide base is directly fixed to the X-axis slide base. 2. The lead turner unit according to claim 1, wherein the ratio L / W of the sliding portion length L and the sliding portion width W of the bite mounting slide is 1.5.