JPS6071103A - Tool rest of automatic nc lathe - Google Patents

Abstract

PURPOSE:To minimize the times with works out of machining, by providing selectivity of cutters when the cutter tip has retracted alightly from a work to be machined, after machining is completed and the cutter began to retract. CONSTITUTION:A servo motor 18 in operation allows sink of the tool 22a together with other cutters down to a specific position, to be combined with the sliding motion of the spindle table in the direction fore and aft, so as to apply specified machining processes to a rod 7. When the machining is completed, the tool 22a is together with other cutters retracted by the rotating servo motor 18, and then a subsequent cutter shall be selected in the same manner. Further, parallel setting of cutters in rather close pitches will provided indexing of the tool rest in a very short time.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the configuration of a tool rest for an NC automatic lathe, and particularly has a plurality of tools. The development of NC automatic lathes in recent years has been remarkable, and various high-efficiency NC automatic lathes have been developed.

However, when machining a large number of the same product in succession, these lathes are still often not as good as cam-type automatic lathes. The main reason for this is often the fact that it takes a long time to select and position a plurality of bytes when sequentially selecting and using them.

In other words, in a cam-type automatic lathe, while cutting with one cutting tool, the next tool selected approaches the cutting tool σ), and at the same time the cutting tool that has completed the cutting operation retreats, the next tool moves. Cutting is usually done with one or two bits, and machining is often done with one or twelve bits or a bit and a drill at the same time, and the cam is designed to minimize the non-cutting time when selecting a bit. There is.

However, when selecting a cutting tool on an NC lathe, after finishing cutting work with one cutting tool, the tool post retreats to the tool change position, selects and positions the next tooling tool, and then moves forward to the processing area.
Next θ) The structure is usually configured so that cutting work is performed with a cutting tool, and the distance between the cutting area and the tool exchange position is also adjusted to prevent interference between the workpiece and the tool during tool exchange. Generally, θ is large enough to avoid
) has the disadvantage that the non-cutting time when selecting a cutting tool becomes long.

Of course, if each tool tool is provided with an independent tool feed mechanism and each is driven by NC, it is possible to work in exactly the same way as an automatic lathe (cam type θ).
The lj control axes are subject to NC control at the same time, and both the NC device and the machine itself become extremely expensive.Also, in order to prevent mutual interference between the axes, it is necessary to use hardware to prevent mutual interference between the axes. However, it is necessary to take fairly complex measures to prevent interference.

On the other hand, a cross feed table that slides perpendicularly to the center line of the rotating main shaft σ) - Multiple tool holders that hold the bits attached parallel to the center line of the main spindle are arranged side by side on the cross feed table. Lathes that have been installed are also known, but if the dies are placed close to each other, chips may get tangled with the neighboring bits, etc.
The removal of chips is not good, and when the interval between the cutting tools is increased, the stroke becomes larger when selecting the cutting tool, and the non-cutting time becomes longer.In addition, the shape of the cutting edge of the cutting tool used is also difficult to put into practical use. Must be.

The present invention solves the drawbacks mentioned above, and in an NC automatic lathe having a plurality of cutting tools, the non-cutting time when selecting the cutting tool is minimized, and the number of controlled axes is minimized. The aim is to provide a new JdL configuration.

Below - the invention will be explained with reference to the drawings.

Figures 1 and 2 show an embodiment of an NC automatic lathe equipped with the tool post of the present invention, and Figure 1 is a view of the iE plane 01.
Figure 2 shows the left 1111 view. In the figure, headstock 1
Babe = Su 20 rl: [backwards (Maki 1 figure and G'l 1 person -
NC (not shown) is supported slidably in the right direction).
The rotation of the servo motor B controlled by the device is transmitted to the ball socket 4 and converted into linear motion by the one nut 5, so that the headstock 1 slides in the front-rear direction.

The main spindle 6 is rotatably supported by a headstock 1, and is rotationally driven by a drive means (not shown).The main spindle 6 is hollow, and a workpiece 7, which is a rod, protrudes forward through the main spindle 6. - It is gripped by the chunk 8 and rotates together with the main shaft 6.

In front of the headstock 1, there is provided a column 10 having a guide hole 9 along the center line of the spindle.
0 is provided with a sliding surface car that is orthogonal to the main heel 1i11+ and can be slid in both the X and Y directions orthogonal to each other, and the tool feed stand 11 (upper, vertical direction) supported by this sliding surface is provided. (X-axis direction) and left-right direction (Y-axis direction).

That is, the guide rail 1 fixed to the column 10
As a result, the slide plate 14 guided through the ball 13 forms a slide that can slide in the left and right direction and is fixed to the slide plate 14. Left and right slide 1-'15 and blade feed stand 1
Similarly, a ball slide formed by a guide rail 16, a slide plate 17 (see FIG. 2), and a ball (not shown) allows sliding in the vertical direction.

These two orthogonal sliding surfaces are each N
The rotation of the Nox motor 18y19 controlled by the C device is transmitted to the ball screw 2 [1-21] to slide the blade feed stand 11 in the vertical and horizontal directions.

The knife feed stand 11vC has one or more pies) 22a.

22b--The tool holder 2, which made it possible to do several phrases, is located above the spindle center line, and the pi) 22a, 22b
-... are provided so that their tips are aligned and held downward at a predetermined pitch.

In Figure 2, one or more pies) 22k 22b-...
Although it is shown as being held on one tool holder 26, it is designed to be convenient for removing the tool holder and presetting the tool, and it is not a normal tool holder. Similarly, a tool in which each cutting tool is independent and each tool has a cutting edge position adjustment function can be used in exactly the same way.

Next, in an embodiment of the present invention, the operation at the time of node selection will be specifically explained.

Now, as shown in FIG.
(Pi) 22C is shown in a retracted state. If the next tool to be selected is, for example, the left-most tool 22a, the next position can be determined simply by moving the single-sword feeder 11 to the right by two pitches by the rotation of the servo motor 19 and stopping at a predetermined position θ). (Pi) Complete the selection of 22a.

1. The selection of the cutting tool is based on the bar material 7 that is the workpiece.
When machining is completed, the cutting tool retreats and the tip of the cutting tool retreats to a predetermined position slightly away from the cutting tool, allowing selection. There is no need to retreat to the changing position, and the time required to select one tool is greatly reduced.

Since the cutting tools are arranged side by side at a relatively narrow pitch than ever before, it is possible to select and position the cutting tools extremely quickly by simply rotating the servo motor 19, even if the cutting tools are located one distance apart. Therefore, tool force selection can be completed in an extremely short time compared to conventional methods such as indexing of a turret tool rest.

Subsequently - by rotation of the servo motor 18 - by) 22
The tool a descends to a predetermined position together with the other cutting tool, and is combined with the longitudinal sliding movement of the headstock 1 to perform the required cutting on the bar 7.

When the cutting process is completed, the cutting tool 22a moves back together with the other tools by the rotation of the servo motor 18, and the next cutting tool is selected in the same way.When all the processing is completed, the parts are automatically removed like a normal machine. is cut off from the bar 9 and processed into primary parts.

As described above, according to the configuration of the NC automatic lathe σ) tool post of the present invention, the cutting tool is provided above the lifetime axis, so even if the intervals between the cutting tools are close together, the flow of chips is good.
Since the intervals between bites are close, the selection time when selecting bites is shortened - and! 1<1ljll An inexpensive NC automatic lathe with two axes has been constructed - and its effects are significant.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of an NC automatic lathe having a turret according to the present invention, and FIG. 2 is a left side view. 1... Headstock - 8... Main spindle, 9...
・Guide Bush, 10...Column, 11...
・Cutter feed stand, 22...ノ (item 1.26...
...Bite holder.

Claims (1)

[Claims] a blade feed stand that is slidable in both X and Y axes directions perpendicular to the spindle centerline and mutually orthogonal;
a tool holder that holds a plurality of tools arranged in parallel along the Y-axis direction; an NC control means that moves the tool feed base along the X-axis direction to drive and control the depth of cut of one tool (σ); A tool post for an NC automatic lathe, characterized in that it has a positioning means for moving along the tool σ) and selectively positioning the tool σ.