KR20230114042A - Automatic tool changer that drives the cam - Google Patents

Abstract

The cam-driven automatic tool changer of the present invention has a box-shaped structure, a cam box (1) with a space inside which parts can be provided, and a drive source coupled to the top of the cam box (1) by a fastening member. (3), a first pulley 17 connected to the shaft of the drive source 3, a second pulley 21 connected by the first pulley 17 and the belt 19, and a shaft connected to the second pulley 21 A worm gear (5), a worm wheel (7) meshed with the worm gear (5), a cam assembly (9) coupled to the same axis as the worm wheel (7), and a constant in the same direction as the axis of the worm wheel (7) in the cam assembly (9) A groove is dug, and one side is inserted and guided into the lever guide hole (9a) having a curved shape, the cam groove (9b) provided in a part of the outer circumferential section of the cam assembly (9), and the lever guide hole (9a), and the other side is a spline shaft. Lever 11 hinged with (13), disposed in a radial direction with respect to the axis of the spline housing 15, and the roller 23 coupled to the cam groove 9b of the cam assembly 9 to the spline shaft 13 It is intended to include a combined tool magazine 25 .

Description

Automatic tool changer that drives the cam}

The present invention relates to an automatic tool changer for a machine tool, and more specifically, reduces noise by improving the precision of a roller gear cam and minimizes tool change time, thereby reducing non-cutting time and reducing processing time and increasing processing efficiency. It relates to an automatic tool changer of a cam driven type capable of

A machining center including an automatic tool changer (ATC) is one of the types of equipment that processes workpieces into various shapes and dimensions with various cutting or non-cutting processing methods, while automatically exchanging tools. It is a numerically controlled machine tool that can continuously perform milling, drilling, boring, tapping, reaming, etc., and is essential for reducing non-cutting time and reducing processing time and increasing processing efficiency as high-speed and high-efficiency are required according to technological development. It is a device.

The automatic tool changer is divided into a magazine for mounting tools and a cam box for replacing tools. The cam box serves to exchange tools mounted in the magazine with tools mounted on the spindle.

1 is a front view of a conventional automatic tool changer, and FIG. 2 is an internal front view of a conventional automatic tool changer.

As shown, the conventional automatic tool changer is located away from the cam box 45.

A chain 41 is connected to the located motor 40 to transmit power to the cam 42 in the cam box 45, a lever path groove 43 is formed on the upper surface of the cam 42, and a spline housing is formed on the outer circumferential surface. A cam groove 44 guiding the path of the roller 51 of (50) is formed.

The first lever 46 connected to the lever path groove 43 is hinged to one side of the cam box 45, and the roller guided to the lever path groove is hinged to one side, and the other side is connected to the spline shaft 55. 2 is connected to the lever (47).

Therefore, when the cam rotates, the first lever and the second lever linearly reciprocate the spline shaft, and rollers installed around the spline housing coupled to the cam groove rotate the spline shaft to rotate the spline shaft.

However, in this conventional automatic tool changer, since the size of the cam box is increased and a chain is connected to the motor to rotate the cam, the precision of power transmission is reduced, noise is generated in the cam box, and tool exchange time is slowed down. There is a problem that processing time and processing efficiency are lowered.

Publication No. 10-2005-0069073 (published on January 5, 2005)

The present invention is to solve the above problems, and by improving the precision of the roller gear cam to reduce noise and minimize tool change time, a cam driving method that can reduce non-cutting time and machining time and increase machining efficiency. It is intended to provide an automatic tool changer for

The cam-driven automatic tool changer of the present invention has a box-shaped structure, a cam box with a space inside which parts can be provided, a drive source coupled to the top of the cam box with a fastening member, and a drive source connected to the shaft of the drive source. 1st pulley, 2nd pulley connected by belt to 1st pulley, worm gear connected to the axis of the 2nd pulley, worm wheel meshed with the worm gear, cam assembly coupled to the same axis as the worm wheel, cam assembly in the same direction as the axis of the worm wheel A lever guide hole having a curved shape, a cam groove provided in a part of the outer circumferential section of the cam assembly, one side inserted into the lever guide hole and guided, and the other side hinged with the spline axis Lever, axis of the spline housing It is arranged in a radial direction with respect to, characterized in that it comprises a tool magazine coupled to the roller spline shaft 13 coupled to the cam groove of the cam assembly.

In addition, it is characterized in that the upper spline support bearing is installed at the upper end of the spline shaft, and the lower spline support bearing is installed at the lower end.

In addition, a collision avoidance means is provided at the lower end of the tool magazine; The anti-collision means is provided in a 'B' shape, and a pair of fixed brackets disposed on both sides of the lower part of the tool rack, a pair of proximity sensors provided in a pair and mounted in the direction of looking at the main shaft from the fixed bracket, It includes a control unit connected to the proximity sensor, and the control unit measures the distance between the main shaft and the tool jog, and stops driving the cam box when the tool jog approaches the main shaft within a limit interval.

In addition, the magazine is provided with an arm; The arms are characterized in that recesses are provided on both sides of the body, and grooves that can be fastened to the recesses in a shape-fitting manner are provided on the first arm and the second arm.

The cam box of the present invention reduces noise by improving the precision of the roller gear cam and minimizes tool change time, thereby reducing non-cutting time and reducing processing time and increasing processing efficiency.

1 is a plan view of a conventional automatic tool changer;
2 is an internal plan view of a conventional automatic tool changer;
3 is a perspective view of a cam driven automatic tool changer according to the present invention;
Figure 4 is a perspective view showing the inside of Figure 3;
Figure 5 is a front view of Figure 3;
6 is a view showing a cam groove of a cam assembly of an automatic tool changer;
7 is a front view showing an embodiment of a spline shaft support structure;
8 is a perspective view showing an embodiment of a tool bag magazine.
9 is a perspective view showing an embodiment of a tool bag arm;
Figure 10 is a perspective view of the body of Figure 9;
11 is a perspective view of first and second arms of FIG. 9;

A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. For reference, the size of components, the thickness of lines, etc. shown in the drawings referred to in describing the present invention may be somewhat exaggerated for convenience of understanding.

In addition, the terms used in the description of the present invention are defined in consideration of the functions in the present invention, and may vary depending on the user, operator's intention, convention, and the like. Therefore, the definition of this term deserves to be made based on the contents throughout this specification.

And in this application, terms such as 'include' and 'have' refer to the existence of a specific number, step, operation, component, part, or combination thereof described in the specification, but one or more other It should be understood that the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof is not precluded.

In addition, the present invention is not limited to the embodiments disclosed below, but will be implemented in a variety of different forms, and only this embodiment makes the disclosure of the present invention complete, and the scope of the invention to those skilled in the art. It is provided for complete information.

Therefore, since the present invention can have various changes and various forms, implementation examples (態樣, aspects) (or embodiments) will be described in detail in the specification. However, this is not intended to limit the present invention to a specific disclosed form, and it should be understood to include all changes, equivalents, and substitutes included in the technical spirit of the present invention, and the singular expression used in this specification is clearly different from the context. Include plural expressions unless otherwise indicated.

However, in describing the present invention, detailed descriptions of known or known functions or configurations will be omitted to clarify the gist of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

3 is a perspective view of a cam-driven automatic tool changer according to the present invention, FIG. 4 is a perspective view showing the inside of FIG. 3, FIG. 5 is a front view of FIG. 3, and FIG. 6 is a cam groove of a cam assembly of the automatic tool changer. one drawing.

The present invention 'cam drive type automatic tool changer' (hereinafter referred to as 'automatic tool changer') includes a cam box (1), a drive source (3), a worm gear (5), a worm wheel (7), and a cam assembly (9). ), lever 11, spline shaft 13, and spline housing 15.

The cam box 1 has a box-shaped structure, and a space in which parts can be provided is formed therein.

The drive source 3 is composed of a motor, etc., is coupled to the top of the cam box 1 with a fastening member such as a bolt, and between the drive source 3 and the worm gear 5, a first pulley 17 for transmitting a driving force ), a belt 19, and a second pulley 21 are provided.

The first pulley 17 is connected to the axis of the driving source 3 and can be rotated by the driving source 3, and is connected to the second pulley 21 by a belt 19.

That is, the belt 19 transfers the driving force transmitted to the first pulley 17 to the second pulley 21 .

The worm gear 5 is connected to the shaft of the second pulley 21 to receive rotational force of the second pulley 21, and the worm gear 5 is meshed with the worm wheel 7. As shown, the worm gear 5 and the worm wheel 7 are disposed perpendicular to each other to transmit driving force. The power transmission structure using the worm gear 5 and the worm wheel 7 has an effect of preventing backlash and performing precise operation.

To the worm wheel 7, a cam assembly 9 is coupled on the same shaft. The cam assembly 9 is provided with a lever guide hole 9a and a cam groove 9b.

The lever guide hole 9a has a groove formed in the same direction as the axis of the worm wheel 7 and has a curved shape. One side of the lever 11 is inserted into the lever guide hole 9a to guide the movement of the lever 11 .

The other side of the lever 11 is hinged with the spline shaft 13, so that when the cam assembly 9 rotates, the lever 11 is guided by the lever guide hole 9a and moves as the lever 11 moves. The spline shaft 13 can be moved in a linear direction.

A cam groove 9b is provided on a portion of the outer circumference of the cam assembly 9. A spline housing 15 is coupled to the spline shaft 13, and rollers 23 are provided at regular intervals on the spline housing 15.

The rollers 23 are disposed in a radial direction with respect to the axis of the spline housing 15, and the rollers 23 are coupled to the cam grooves 9b of the cam assembly 9.

Therefore, when the cam assembly 9 rotates, the spline housing 15 can rotate when the roller 23 moves along the cam groove 9b section, and as the spline housing 15 rotates, the spline shaft 13 also rotates. Since it can rotate, as the spline shaft 13 rotates, the tool magazine 25 coupled to the spline shaft 13 rotates together.

Looking at the operation relationship of the automatic tool changing device as described above,

First, when the driving source 3 is driven, the driving force of the driving source 3 is transmitted to the first pulley 17, and the driving force transmitted to the first pulley 17 is transmitted to the second pulley 21 through the belt 19. It is passed on.

The driving force transmitted to the second pulley 21 is transmitted to the worm gear 5, and since the worm gear 5 is meshed with the worm wheel 7, it rotates the cam assembly 9 provided on the same axis as the worm wheel 7. .

As the cam assembly 9 rotates, one side of the lever 11 moves along the lever guide hole 9a, and the other end of the lever 11 moves the spline shaft 13 in a linear direction, and the spline shaft 13 The tool magazine 25 coupled to the ) is also movable in a linear direction.

Therefore, in this embodiment, since the worm gear 5 and the worm wheel 7 are meshed with each other to transmit power, noise is remarkably reduced, backlash is prevented, precise operation is achieved, and noise is minimized. will have

In addition, while the cam assembly 9 rotates, the roller 23 coupled to the spline housing 15 is moved, and the roller 23 moves along the cam groove 9b in the section where the cam groove 9b is located, thereby moving the spline housing ( 15) rotate.

As the spline housing 15 rotates, the spline shaft 13 rotates, and thus the tool magazine 25 can also rotate.

Accordingly, the automatic tool changer of the present embodiment adopts a structure in which the cam assembly 9 rotates using the roller 23, thereby reducing noise and enabling more precise tool change.

In the following embodiments, the support structure of the spline shaft will be described.

When the spline shaft 13 performs linear reciprocating motion up and down, if the support of the spline shaft is unstable, the efficiency of tool exchange is reduced. Therefore, in this embodiment, a structure capable of stably moving the spline shaft is proposed.

7 is a front view showing an embodiment of a spline shaft support structure.

As shown, the feature of this embodiment is that the upper spline support bearing 16a is installed at the upper end of the spline shaft 13, and the lower spline support bearing 16b is installed at the lower end.

In addition, another characteristic is that the upper spline support bearing 16a and the lower spline support bearing 16b are oilless bearings.

In the spline shaft 13 having such a structure, bearings 16a and 16b for supporting the spline shaft secondarily supporting the rotational motion and reciprocating motion of the spline shaft 13 are installed at the upper and lower ends of the spline shaft 13 during tool exchange. As a result, the operation of the spline axis is improved with a support structure at both ends, and accordingly, the tool change of the automatic tool changer is stably performed, thereby increasing the reliability of machining and maximizing the efficiency of tool change by operating with accurate motion. It works, it has an effect.

In the following embodiments, a structure for preventing a tool carrier from colliding with a main shaft will be described.

This embodiment is intended to suggest a structure for preventing collision with the main shaft due to malfunction of the tool bag.

8 is a perspective view showing an embodiment of a tool bag magazine.

As shown, the feature of this embodiment is that the collision prevention means 30 is provided at the lower end of the tool support 25, and the collision prevention means 30 includes a fixed bracket 31 and a proximity sensor 33 includes

The fixing brackets 31 are provided in an L shape and are arranged in pairs on both sides of the lower part of the tool basket 25.

The proximity sensors 33 are provided as a pair and are mounted in a direction facing the main axis of the automatic tool changer in the fixing bracket 31 .

That is, the proximity sensor 33 is connected to the control unit (not shown), measures the distance between the main shaft and the tool support 25, and when the tool support 25 approaches the main shaft within the limit interval, the control unit controls the cam By automatically stopping the drive of the box, it has the action and effect of preventing the collision between the tool support 25 and the main shaft in advance.

Therefore, according to the present embodiment, by mounting a pair of proximity sensors on both sides of the lower part of the tool basket, collision with the spindle can be prevented in advance when the spindle is not placed at the tool exchange position during rotation of the tool basket.

Hereinafter, a structure in which the arm of the tool bag is coupled in a detachable state will be described.

The arm of a generally commercially available automatic tool changer consists of two arms integrally formed on both sides of the body, and a structure in which tools are exchanged between the magazine and the spindle while being rotated is known. , If parts are damaged or the type of tool needs to be changed, the entire arm must be replaced, which increases replacement cost and makes the replacement work cumbersome.

In this embodiment, the arms on both sides of the body are detachably fastened from the body, so that when a part is damaged or the type of tool is changed, only the relevant part is replaced without replacing the entire part, thereby facilitating the replacement of the part and reducing the cost of replacement. It is intended to suggest a structure of a compatible arm that can reduce .

FIG. 9 is a perspective view of a tool bag arm according to an embodiment, FIG. 10 is a perspective view of the body of FIG. 9 , and FIG. 11 is a perspective view of the first and second arms of FIG. 9 .

As shown, the arm provided in the magazine 25 of the automatic tool changer includes a body 110, a first arm 120 and a second arm 130.

The body 110 is coupled to the drive shaft to rotate, and the first arm 110 and the second arm 130 are detachably coupled.

That is, recessed portions 111 and 111b are provided on both sides of the body 110, and each groove portion that can be fastened to the recessed portion 111 in a shape-fitting manner is provided on the first arm 120 and the second arm 130. (121, 131) is characterized in that it is provided.

In addition, another feature is that the body 110 and the arms 120 and 130 are fastened and fixed with separate bolts 140 after groove coupling.

The arm of the tool bag having such a structure has the function of facilitating the replacement of parts and reducing the replacement cost by replacing only the corresponding part without replacing the entire part when the part is damaged or the type of tool is changed. , has an effect.

1. Cam box 3: drive source
5: worm gear 7: worm wheel
9: cam assembly 9a: lever guide hole
9b: cam groove 11: lever
13: spline shaft 15: spline housing
16a: upper spline shaft support bearing 16b: lower spline shaft support bearing
17: first pulley 21: second pulley
23: roller 25: tool magazine
30: collision prevention means 31: fixing bracket
33: proximity sensor 110: body
111,111b: lower back 120: first arm
130: second arm 121, 131: groove
140: bolt

Claims (4)

A cam box 1 having a box-shaped structure and having a space in which parts can be provided,
A drive source (3) coupled to the top of the cam box (1) as a fastening member;
A first pulley 17 connected to the shaft of the drive source 3;
The second pulley 21 connected by the first pulley 17 and the belt 19,
A worm gear 5 connected to the shaft of the second pulley 21,
A worm wheel (7) meshed with a worm gear (5),
A cam assembly (9) coupled to the same axis as the worm wheel (7),
A lever guide hole 9a having a curved shape and having a constant groove dug in the cam assembly 9 in the same direction as the axis of the worm wheel 7;
A cam groove (9b) provided on a portion of the outer circumference of the cam assembly (9);
Lever 11, one side of which is inserted into the lever guide hole 9a and the other side of which is hinged with the spline shaft 13;
A roller 23 disposed radially with respect to the axis of the spline housing 15 and coupled to the cam groove 9b of the cam assembly 9;
A cam-driven automatic tool changer comprising a tool magazine 25 coupled to the spline shaft 13.
According to claim 1,
An upper spline support bearing (16a) is installed on the upper end of the spline shaft (13) and a lower spline support bearing (16b) is installed on the lower end of the spline shaft (13).
According to claim 2,
A collision avoidance means 30 is provided at the lower end of the tool basket 25;
The anti-collision means 30,
Fixed brackets 31 provided in a 'b' shape and disposed in pairs on both sides of the lower part of the tool basket 25;
A proximity sensor 33 provided as a pair and mounted in a direction facing the main shaft from the fixing bracket 31;
It includes a control unit connected to the proximity sensor 33, and the control unit measures the distance between the main shaft and the tool shoulder support 25, and stops the drive of the cam box when the tool support support 25 approaches the main shaft within the limit interval. Cam-driven automatic tool changer.
The method of claim 3,
An arm is provided in the magazine 25;
cancer,
Both sides of the body 110 are provided with recesses 111 and 111b, and the first arm 120 and the second arm 130 have recesses 121 and 131 that can be fastened to the recess 111 in a shape-fitting manner. A cam-driven automatic tool changer, characterized in that provided.