KR200237524Y1 - Tool positon determination system for a machine tool with spindle - Google Patents

Abstract

The present invention relates to a tool positioning device of a machine tool having a spindle for precisely setting the position of the tool when the tool is mounted on the spindle for processing a material in a machine tool having a spindle such as an engraver or a CNC engraver. The internal structure of the spindle axis has been improved to accurately determine the position of the tool set by the jig.

To this end, as the spring collet 5 is inserted into the insertion hole 2a formed in the spindle shaft 2 and the tool 6 is inserted into the insertion hole to fasten the fixing nut 7, the tool is coupled to the spindle shaft ( 2) In the machine tool having a spindle configured to be mounted on, the bushing (9) is fixed to the inside of the spindle shaft (2) and the tool distance adjusting micro stopper having a tool insertion groove (10a) in the head portion of the bushing ( 10) by screwing the position adjustable so that the end surface of the tool (6) is in close contact with the micro stopper (10) for tool distance adjustment, the spindle shaft by compression of the spring collet (5) in accordance with the rotation of the fixing nut (7) It is comprised so that the tool 6 may be attached to (2).

Description

Tool positon determination system for a machine tool with spindle

The present invention relates to a tool positioning device of a machine tool having a spindle, and more specifically, to precisely set the position of the tool when the tool is mounted on the spindle to process a material in a machine tool having a spindle such as an engraver or a CNC engraver. A tool positioning apparatus for a machine tool having a spindle for enabling the same.

Generally, the engraver or CNC engraver that processes the material according to the rotation of the spindle axis where the tool (end mill) is mounted, or the tool is mounted on the initial spindle axis, or the tool is worn out according to the machining. When replacing, the position of the tool should be fixed by using a separate jig.

Figure 1a and Figure 1b is a longitudinal cross-sectional view showing a spindle structure of a conventional machine tool Figure 2 is a schematic view showing a machine tool having a multi-axis structure, looking at the structure of the spindle as follows.

The spindle shaft 2 is installed on the body 1 so as to be smoothly rotated by the plurality of bearings 3 and supported by the cap 4, and the insertion shaft 2a tapered to the upper and lower beams is provided on the spindle shaft. Is formed and a spring collet 5 having a shape corresponding to that of the insertion hole is provided inside the insertion hole.

The spring collet 5 has a cutout portion 5a formed to have a plurality of pieces so that the spring collet 5 is expanded as much as possible in the absence of an external force and is compressed inside when the external force is applied.

In addition, a screw nut 5 is screwed into the outer circumferential surface of the spindle shaft 2 to push the spring collet 5 into the insertion hole 2a so that the tool 6 is supported by the spring collet 5. It is.

Threads formed on the spindle shaft 2 and the fixing nut 7 are formed to have a direction opposite to the rotational direction of the spindle shaft.

This is to prevent the fixing nut 7 from being released from the spindle shaft 2 when the spindle shaft 2 rotates at a high speed for processing the material.

Therefore, in the state as shown in FIG. 1A where the fixing nut 7 is loosened from the spindle shaft 2, the spring collet 5 colleting the tool 6 exits from the insertion hole 2a and is expanded as much as possible by the restoring force. 6) the gap between the tool (6) can be removed from the spindle shaft (2).

In this state, the tool 6 is pushed into the inside of the spring collet 5 to initially set the tool 6 in the spindle shaft 2 or to repair and reset the worn tool, and then the jig 8 at the lower end thereof. Position and the fastening nut (7) is fastened, the spring collet (5), which has come out of the insertion hole (2a), is pushed in by the fixing nut (7), and the outer peripheral surface of the insertion hole (2a) and the spring collet (5) Since the tool 6 is contracted by the inclined surface formed in the collet, the material can be processed according to the rotation of the spindle shaft 2.

However, this conventional spindle structure has the following problems.

First, even if the position of the tool is adjusted by the jig 8 at the initial setting of the tool 6, the inclined surface formed in the insertion hole 2a and the spring collet 5 when the tool is fastened according to the rotation of the fixing nut 7. By the spring collet 5 is pushed into the interior of the insertion hole (2a) by 't' shown in Figure 1b there was a limit in setting the position of the tool (6) correctly.

Second, moreover, in the case of an engraver or CNC engraver equipped with a multi-axis spindle as shown in FIG. 2, the position of the end of the tool 6 fastened to each spindle shaft is changed due to the above-described problems, so that a uniform product cannot be produced. There was a discontinuance.

The present invention has been made to solve such a conventional problem, it is an object to improve the internal structure of the spindle axis to accurately determine the position of the tool set by the jig.

According to a form of the present invention for achieving the above object, by inserting a spring collet in the insertion hole formed in the spindle shaft and inserting the tool in the insertion hole to tighten the fixing nut, the spindle is configured to be mounted on the spindle shaft. In the machine tool having a bushing is fixed to the inside of the spindle shaft, and the bushing is coupled to the tool distance adjustment micro-stopper with a tool insertion groove formed in the head portion to adjust the position so that the front end surface of the tool to the tool stop adjustment micro Provided is a tool positioning apparatus for a machine tool having a spindle, wherein the tool is mounted on the spindle shaft by compression of the spring collet according to the rotation of the fixing nut in a close state.

1a and 1b is a longitudinal sectional view showing a spindle structure of a conventional machine tool,

Figure 1a is a state without a tool mounted on the spindle

1b is a state in which a tool is mounted and positioned on a spindle

2 is a schematic view showing a machine tool having a multi-axis structure

3a and 3b is a longitudinal sectional view showing a spindle structure of the present invention,

Figure 3a is a state without a tool mounted on the spindle

3b is a state in which the tool is mounted on the spindle and positioned

4 is a cross-sectional view taken along the line A-A of FIG. 3A

Explanation of symbols for main parts in the drawings

2: Spindle Shaft 5: Spring Collet

6: tool 7: fixing nut

9 bushing 10 micro stopper for tool distance adjustment

11: loosening preventing elastic member 12: marking scale

13: instructions

Hereinafter, with reference to Figures 3 and 4 showing the present invention as an embodiment in more detail as follows.

3A and 3B are longitudinal cross-sectional views showing the spindle structure of the present invention, and FIG. 4 is a cross-sectional view taken along the line A-A of FIG. 3A. I will grant it.

In the present invention, a bushing 9 having a thread 9a formed therein is fixed to the inside of the spindle shaft 2, and the bushing has a tool inserting groove 10a such as '-', '+' or a hexagonal groove in the head. The formed tool distance adjustment micro stopper 10 is screwed to adjust the position so that the tip of the tool 6 is in close contact with the head of the tool distance adjustment micro stopper 10 when the tool 6 is set.

The pitch of the thread 9a formed in the bushing 9 and the tool stop adjustment micro stopper 10 is preferably set to maintain 0.2 mm or less so as to finely adjust the position of the tool stop adjustment micro stopper 10. It is not necessary to necessarily limit the pitch of the micro stopper 10 for tool distance adjustment.

This is because in the case of a skilled worker, even if the pitch of the thread is large, the position of the tool 6 mounted on the spindle shaft 2 can be finely adjusted by appropriately adjusting the amount of rotation of the tool stop adjusting micro stopper 10.

And the anti-loosening elastic member 11 is elastically installed at the rear of the tool distance adjustment micro stopper 10, the anti-loosening elastic member 11 uses a coil spring as shown in Figure 3a and 3b, Or it will be understood that rubber and the like having good elastic force can be applied.

On the other hand, the display scale 12 is formed at regular intervals on the head of the tool stop adjustment micro stopper 10, and the guide 13 for identifying the position of the display scale 12 is fixed on the insertion hole (2a) have.

This is to allow the operator to visually identify the amount of rotation of the tool stop adjustment micro stopper 10 to determine the position of the tool 6 set on the spindle shaft 2 accurately.

Referring to the operation of the present invention configured as described above are as follows.

First, in the state as shown in Figure 3a by pushing the tool (6) to be set in the spring collet (5) located in the center of the spindle shaft (2), the front end portion of the head of the micro stopper (10) for tool distance adjustment After close contact, the jig 8 is positioned at the bottom of the tool 6 to determine the mounting position of the tool.

As a result, if the position of the tool 6 is located at the lower position than the desired position, tighten the tool stop adjusting micro stopper 10. On the contrary, if the position of the tool 6 is positioned at the upper position than the desired position, The stopper 10 should be released.

For this purpose, the operator removes the tool 6 from the spindle shaft 2 and then pushes a tool such as a screwdriver or a hexagon wrench into the spindle shaft 2 and places it in the tool insertion groove 10a. When the stopper 10 is rotated clockwise or counterclockwise, the pitch of the thread 9a is formed to be 0.2 mm or less so that the position of the tool stop adjustment micro stopper 10 is finely adjusted. When the micro stopper 10 is finely adjusted, the indication scale 12 is shown on the head and the guide hole 13 is fixed to the insertion hole 2a. It can be adjusted while visually identifying.

With the operation as described above, the tool 6, which has been separated from the spindle shaft 2, is pushed again while the position of the tool stop adjustment micro stopper 10 is slightly changed, and then the jig 8 is placed at the lower end of the tool. If the setting state is determined to be correct by simply turning the fixing nut (7) that has been released, the tip of the tool (6) is in close contact with the head of the tool stop adjusting micro stopper (10). Since the spring collet 5 is pushed into the inside by the inclined surface formed on the outer circumferential surface of the insertion hole (2a) and the spring collet (5) without being variable, it is compressed to collet the tool 6, so that the tool on the spindle shaft (2) The position of (6) is accurately determined.

According to the present invention, since the setting position of the tool 6 can be accurately maintained according to the adjustment of the tool stop adjustment micro stopper 10 as described above, even if the engraver is provided with a plurality of spindle shafts 2 as shown in FIG. It is understood that the lower part of 6) can be set to always match.

As described above, the present invention has the following advantages over the prior art.

First, the tool is not pushed into the insertion hole by the spring collet since the tool is mounted by tightening the fixing nut while the tool is initially set or reset, the head of the tool is in close contact with the micro stopper for adjusting the tool distance. This ensures that the tool setting position is always kept accurate.

Second, even in the case of an engraver or CNC engraver equipped with a multi-axis spindle as shown in Figure 2 it is possible to maintain a constant position of the end of the tool fastened to each spindle axis at all times it is possible to produce a uniform product.

Claims (3)

A machine tool having a spindle configured to mount a spring collet in an insertion hole formed in a spindle shaft and to insert a tool into the insertion shaft to fasten a fixing nut to mount the tool on the spindle shaft. The spring collet of the spring collet according to the rotation of the fixing nut is fixed to the bushing by screwing a tool stop adjustment micro stopper having a tool insertion groove formed in the head to adjust the position thereof. Tool positioning device for a machine tool having a spindle, characterized in that configured to be mounted on the spindle axis by compression. The method of claim 1, Tool positioning apparatus for a machine tool having a spindle, characterized in that the elastic member for preventing loosening is elastically installed at the rear of the tool stop adjustment micro stopper. The method of claim 1, A tool positioning apparatus for a machine tool having a spindle, characterized in that a marking scale is formed on the head of the tool stop adjustment micro stopper and a guide for identifying the position of the scale is inserted in the insertion hole.