JPS6225317Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a high-speed drive device in a machine tool such as a machining center.

This type of machine tool has a spindle head and an automatic tool changer (ATC).

The spindle head includes a spindle and a drive for rotating it, while the automatic tool changer includes a tool storage selector and a tool change arm.

The tool storage selector of the automatic tool changer stores many types of tools so that one of them can be selected, and the selected tool and the tool installed on the spindle of the spindle head Tools are automatically exchanged using a tool exchange arm.

Such machine tools have been rapidly used in recent years because they allow a wide range of machining to be carried out by simply replacing the various types of tools stored in one machine.

Most conventional machine tools rotate their main shafts at a standard rotational speed of approximately 28 to 3150 rpm, for example. A high-speed type is also known, but even in this case, the maximum rotation speed is only about 10,000 rpm.

This is because most of the stored tools had relatively large diameters and this level of rotational speed was sufficient.

However, depending on the processing content, it is necessary to rotate the tool at a higher speed, and such a demand has been increasing recently.

For example, in engraving work, it is necessary to use a tool with a small diameter of, for example, 1 mm and to rotate at a high speed of about 15,000 rpm. In engraving work, it is more efficient to use a small-diameter tool rotating at high speed of 15,000 rpm for the engraving area, and to use a relatively large-diameter tool for the pre-metallic part using a spindle that rotates normally. or,
Since engraving work takes a long time, it is necessary to automatically exchange spare tools.

One possible way to meet this request is to change the specifications of the drive machine for the spindle head, etc., which is installed, for example.

However, in order to do this, basic and major modifications would have to be made, resulting in an extremely high cost.

This invention was devised in order to solve the above-mentioned problems, and its purpose is to easily make it possible to use existing machine tools without making basic and major changes. It can be added later, allowing high-speed tools to rotate at high speed, and
To provide a high-speed drive device for a machine tool that does not interfere with the function of an automatic tool changer.

The high-speed drive device for a machine tool of the present invention can be supported by the spindle head and moved in the axial direction of the spindle in a machine tool equipped with a spindle head equipped with a standard rotating spindle and an automatic tool changer. a movable body, a sliding body supported by the movable body and capable of moving near and far with respect to the main shaft, a high-speed drive machine provided on the sliding body, and a wedge-attached to the rotating shaft of the high-speed drive machine. a drive pulley, a pair of tension pulleys supported near the main axis of the sliding body and capable of expanding and narrowing movement; a high-speed tool rotatable by an automatic tool changer on the main axis of the spindle head; a driven pulley, and a belt capable of automatically changing between a detached state in which it is stretched between the drive pulley and a pair of tension pulleys and a spanning state in which it is stretched between the drive pulley and the driven pulley. Its characteristics lie in its composition.

In other words, a high-speed drive is installed separately in addition to the drive already installed on the spindle head, and between the drive pulley wedged on the rotating shaft of this drive and the driven pulley of the high-speed tool rotatably attached to the spindle. It is designed so that a belt can be wrapped around it, and the high-speed tool is rotated at high speed by the high-speed drive machine.

However, when replacing a high-speed tool that is no longer needed with another tool using an automatic tool changer, the belt is automatically removed from the driven pulley of the high-speed tool so as not to interfere with the replacement work. This is what I did.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of embodiments of the present invention will be explained below based on the drawings.

FIG. 1 is a front view showing the structure of a high-speed drive device according to the present invention. FIG. 2 shows its plan view. FIG. 3 is an enlarged side view of the tension pulley portion.

The high-speed drive device 1 is applied to a machine tool 100 such as a machining center, for example, and it has a spindle head 1.
01 and an automatic tool changer 102.

In this example, the spindle head 101 can move in the vertical direction, and a drive device 10 such as an electric motor is mounted on the head.
3 is provided, and a vertical main shaft 104 rotated thereby projects downward.

The main shaft 104 is rotated at a standard rotation speed of about 28 to 3150 rpm in this example, and a tool or a high-speed tool is attached to the lower part of the main shaft 104.

The automatic tool changer 102 includes a tool storage selector 1
05 and a tool exchange arm 106, the tool storage selector 105 stores many types of tools, one of which is selected and extracted from below the tool storage selector 105 in a vertical state. .

The tool exchange arm 106 can automatically exchange this extracted tool (new tool) with the tool (old tool) mounted on the spindle 104 of the spindle head 101.

The high-speed drive device 1 is applied to such a machine tool 100, and includes a movable body 2, a sliding body 3, a high-speed drive 4, a drive pulley 5, a tension pulley 6, a belt 7, a high-speed tool 8, Its main part is composed of a driven pulley 9.

The movable body 2 is supported by the spindle head 101 and rotates around the spindle 1.
It can move in the axial direction of 04. In this example, since the main shaft 104 is vertical, it is configured to move in the vertical direction.

The movable body 2 has a box-like shape, and a control device is housed inside the movable body 2.Four boss bodies 10 are provided on the left side at the front, rear, top and bottom. On the other hand, on the right side of the spindle head 101, there are upper and lower brackets 11, 11.
The two guide shiaps 12 and 12, which are put in vertical state, are provided, and the motion 2 is the main shaft head 101 due to the fact that the boss body is fitted to the guide shift freely. can be moved to.

A bracket 13 extends horizontally on the upper right side of the spindle head 101, and a lifting cylinder 14 for driving the movable body 2 up and down is interposed between the bracket 13 and each part of the movable body 2. There is.

The sliding body 3 is supported by the movable body 2 and has a spindle head 10.
It can move near and far with respect to the main axis 104 of 1. In this example, it is designed to move horizontally to the left and right.

The sliding body 3 has a hanging plate shape and is arranged on the lower front surface of the movable body 2, and four boss bodies 15 are provided on the upper, lower, left and right sides of the rear surface thereof. On the other hand, on the lower front surface of the movable body 2, there are provided two upper and lower horizontal guide shafts 17, 17 supported by left and right brackets 16, 16, and a boss body is slid onto the guide shafts. By being movably fitted, the sliding body 3 can move laterally to the left and right with respect to the movable body 2.

A lateral movement cylinder 18 for moving the slider 3 in the left-right direction is interposed between the right bracket 16 and each part of the slider 3.

The high-speed drive machine 4 is a drive machine 10 for the spindle head 101.
3 is provided on the sliding body 3, and is used as an electric motor or the like. In this example, it is attached to the left front side of the sliding body 3, and its rotating shaft 19 is in a hanging state.

The drive pulley 5 is wedged on the rotating shaft 19 of the high-speed drive machine 4, and in this example, pulley portions of a small diameter, a medium diameter, and a large diameter are formed from above.

A pair of tension pulleys 6 are supported near the main axis of the sliding body 3 and can be moved to expand or narrow. In this example, there are two on the front and back on the left side of the sliding body 3, and they expand and narrow in the front and back direction.

A support plate 20 extending horizontally to the left is attached to the lower left side of the sliding body 3, and a substantially arc-shaped notch 21 is cut on the left side of the support plate 20 so as not to interfere with the main shaft 104. ing.

As shown in FIG. 3, brackets 22, 22 are vertically provided before and after the notch 21, and boss bodies 23, 23 are provided at the lower portions of each bracket. Each boss body has guide bars 24, 2
A block-shaped pulley holder 2 is fitted at the inner end of each guide bar so as to be slidable in the front and back direction.
5, 25 are attached.

Tension pulleys 6, 6 are pivotally attached to the lower part of each pulley holder by vertical shafts 26, 26, respectively.

Between each pulley holder and a part of the bracket, there are tension pulley cylinders 27, 27 for moving the pulley holder in the front and back direction with respect to the bracket.
are interposed respectively.

The belt 7 is stretched between the drive pulley 5 and the pair of tension pulleys 6, 6. In this example, the intermediate pulley 28 is attached to the sliding body 3.
Because of this, endless first and second belts 29 and 30 are used.

The intermediate pulley 28 is provided with a bracket 31 extending horizontally on the lower front surface of the right side of the sliding body 3 so as to be freely rotatable about a vertical shaft 32.

The intermediate pulley 28 is formed with a first pulley portion having a large diameter, a medium diameter, and a small diameter portion from above, and a second pulley portion below this having a small diameter portion and a large diameter portion. ing.

The first belt 29 is stretched between the drive pulley 5 and the first pulley portion of the intermediate pulley 28.
In this example, the large diameter portion of the pulley portion of the drive pulley 5 and the small diameter portion of the first pulley portion of the intermediate pulley 28 are connected to increase the speed.

The second belt 30 is stretched between the second pulley portion of the intermediate pulley 28 and the pair of tension pulleys 6, 6. In this example, the second pulley portion of the intermediate pulley 28 is wrapped around the large diameter portion.

The high-speed tool 8 is attached to the main shaft 104 and is rotatable therewith.

A driven pulley 9 is provided on the high-speed tool 8, and the belt 7 can be wrapped around it.

In this example, the high-speed tool 8 is composed of a chuck body 33 attached to the main shaft 104, a support shaft 34 gripped by the chuck body 33, and a rotating shaft 35 rotatable with respect to the support shaft 34. .

The rotating shaft 35 is provided with a driven pulley 9 having a large diameter pulley portion and a small diameter pulley portion from above, and a cutter 36 can be attached to the lower end of the rotating shaft 35.

In this example, the support shaft 34, the rotation shaft 35,
The driven pulley 9 and the cutter 36 can be removed from the chuck body 33, and another one can be attached. Of course, it is not limited to such a structure.

Next, the operation will be explained based on such a configuration.

1 to 3 show a state in which the belt 7 is wrapped around the driven pulley 9 of the high-speed tool 8.

In this case, the movable body 2 is at the uppermost position and at the intermediate position of the sliding body 3. The tension pulleys 6, 6 are in the narrowly closed position and are in a state where they do not interfere with the belt 7, especially the second belt 30.

In such a state, the high speed drive machine 4 can be activated. Therefore, when this is started, the drive pulley 5 provided on the rotating shaft 19 →
First belt 29 → intermediate pulley 28 → second belt 3
The rotational force is transmitted in the order of 0 → driven pulley 9,
A rotating shaft 35, a driven pulley 9, and a cutter 36 rotate with respect to a chuck body 33 and a support shaft 34, and a so-called high-speed tool 8 rotates with respect to a main shaft 104, for example.
It is rotated at a rotation speed of 15000 rpm. Of course,
At this time, there is no need to drive the main shaft 104 using the drive machine 103.

When the spindle head 101 is lowered from the position shown in FIG. 1 in order to perform machining using the high-speed tool 8, the high-speed drive device 1 follows the spindle head 101 because it is supported by the spindle head 101, and the high-speed drive function is activated. Work can be carried out without any hindrance.

Next, the case where the belt 7 is removed from the driven pulley 9 of the high-speed tool 8 will be explained.

In this case, first, from the state shown in FIGS. 1 to 3, the tension pulley cylinders 27, 27
Operate shortened. Then, pulley holder 2
5, 25 and tension pulleys 6, 6 change from the narrowed closed position to the expanded position shown in FIG. For this reason,
The belt 7, especially the second belt 30, is stretched around the intermediate pulley 28 and the driven pulley 9,
The area near the driven pulley is expanded by the pair of expanded tension pulleys 6, 6. In this case, since the second belt 30 has elasticity and stretchability, it can be expanded without being cut.

From this state, next, as shown in FIG. 5, the lateral movement cylinder 18 is extended and the sliding body 3 is moved to the left with respect to the movable body 2. In other words, move it to the high-speed tool side. In this case, the pair of tension pulleys 6, 6 are expanded, and the interval between them is set to be larger than the diameter of the driven pulley 9, so that they do not interfere with each other. Of course, the support plate 20 attached to the sliding body 3
Since the notches 21 are cut in, there will be no interference between these.

When the sliding body 3 reaches the leftmost position, the second belt 30 is removed from the driven pulley 9, and the belt is placed between the two tension pulleys 6, 6 and the intermediate pulley 28.

From this state, when the lifting cylinder 14 is lowered, the movable body 2 including the sliding body 3 is lowered relative to the spindle head 101, as shown in FIG.

When the movable body 2 descends to the lowest position, the lateral movement cylinder 18 is operated to shorten the slide body 3 to move the slide body 3 to the right with respect to the movable body 2, passing the intermediate position to the rightmost position.

When the elevating cylinder 14 is shortened and the movable body 2 including the sliding body 3 is raised relative to the spindle head 101, as shown in FIG. 7, the belt 7 is completely removed from the driven pulley 9.

In such a state, that is, when the movable body 2 is in the highest position and the sliding body 3 is in the rightmost position, the tool change arm 1 of the automatic tool change device 102
06, the high-speed tool 8 mounted on the spindle 104 and the tool selected by the tool storage selector 105 can be automatically exchanged.

The belt 7 is attached to the driven pulley 9 of the high speed tool 8.
, the above order is reversed.

Each of the above operations can be performed automatically by NC control.

In this embodiment, the intermediate pulley 28 is provided, and the belt 7 is connected to the first and second belts 29,
Although the case where two of 30 are used is illustrated, the invention is not limited to this. For example, a single belt may be wound between a drive pulley and a pair of tension pulleys.

Furthermore, although the spindle head 101 in this embodiment moves up and down in the vertical direction, it is not limited to such a structure. For example, it may be one that moves horizontally.

As described above, according to the present invention, the following excellent effects can be achieved.

(1) Depending on the content of the work, a high-speed tool can be automatically attached to the spindle of the spindle head using an automatic tool changer, and the high-speed tool can be rotated at high speed using a separate high-speed drive machine.

(2) It can be easily added later even to existing machine tools without making basic and major changes.

(3) When changing tools using an automatic tool changer, the belt that is wrapped around the driven pulley of the high-speed tool is automatically removed, so the function of the automatic tool changer may be hindered. There is no.

(4) Belt engagement/disengagement, high-speed drive machine start/stop, etc. can be controlled automatically, so-called automatically.
This type of work can be automated and efficiency can be improved.

(5) When not using high-speed tools, normal work can be done by turning the standard rotating spindle.

[Brief explanation of drawings]

FIG. 1 is a front view showing the structure of a high-speed drive device according to the present invention. Figure 2 is its plan view. Figure 3 shows
FIG. 3 is an enlarged side view showing a tension roller portion. 4 to 7 are a plan view and a front view of essential parts for explaining the operation of the high-speed drive device according to the present invention. DESCRIPTION OF SYMBOLS 1... High-speed drive device, 2... Movable body, 3... Sliding body, 4... High-speed drive machine, 5... Drive pulley, 6... Tension pulley, 7... Belt, 8
...High speed tool, 9...Driven pulley, 100...
... Machine tool, 101 ... Spindle head, 102 ... Automatic tool changer, 103 ... Drive machine, 104 ... Main spindle.

Claims (1)

[Scope of utility model registration request] In a machine tool equipped with a spindle head having a standard rotating spindle and an automatic tool changer, a movable body supported by the spindle head and movable in the axial direction of the spindle; A sliding body capable of moving near and far with respect to the main shaft, a high-speed drive machine provided on the sliding body, a drive pulley wedged to the rotating shaft of the high-speed drive machine, and a drive pulley near the main axis of the sliding body. a pair of tension pulleys that are supported and capable of expanding and narrowing; a high-speed tool that is automatically attached to the main shaft of the spindle head by an automatic tool changer and is rotatable relative to the main shaft; a driven pulley; and a belt capable of automatically changing between a detached state in which it is stretched between the drive pulley and a pair of tension pulleys and a spanning state in which it is stretched between the drive pulley and the driven pulley. A high-speed drive device for machine tools that is characterized by: