KR102401260B1 - Ring-Type Automatic Tool Changer - Google Patents

Abstract

An objective of the present invention is to provide a ring-type automatic tool exchange device which can contribute to the improvement of the structural stability and durability life of an entire automatic tool exchange device. The ring-type automatic tool exchange device comprises: a magazine (110) provided as a rotating body of a ring shape, and provided with a plurality of tool ports (111) storing tools and provided on the circumferential surface thereof at equal angular intervals in the circumferential direction; a pair of holder blocks (112) separated from each other to form a tool storage space (111a) storing a tool therein; a tool port (111) including an insertion rail (113) provided on an inner wall of the holder blocks (112) to protrude to be inserted into a groove (G) formed on a neck (N) of a tool, and an elastic member (114) arranged on the outside of the pair of holder blocks (112) to elastically press the holder blocks (112) in a direction of narrowing the gap between the pair of holder blocks (112); an inclination block body (121) having an inclined surface (121a) formed on one side thereof; and a tool shifter (120) formed to be inclined at an angle corresponding to the inclination angle of the inclined surface (121a), allowing one end thereof to be rotatably coupled to the inclination block body (121), and including a rotating body (122) having a first rotary gripper (125) and a second rotary gripper (126) gripping a tool on both ends of the other end thereof.

Description

Ring-Type Automatic Tool Changer {Ring-Type Automatic Tool Changer}

The present invention relates to an automatic tool changer for a machine tool, and specifically, to reduce the load on a servo motor, which is a drive system of the automatic tool changer, by reducing the weight of a toolport, etc., while improving driving force and automatic tool change It relates to a ring type automatic tool changer that can contribute to the improvement of the structural safety and durability of the entire device.

A machining center, which is one of the equipment that processes various shapes and dimensions by various cutting or non-cutting methods of workpieces, can continuously perform milling, drilling, boring, tapping, reaming, etc. while automatically exchanging tools. It is a numerically controlled machine tool.

The machine tools such as the machining center include an automatic tool changer, and the automatic tool changer is an essential device for high speed, high efficiency, reduction of non-cutting time, reduction of machining time, and increase of machining efficiency.

The conventional automatic tool changer is generally divided into a drum type (Drum-Type) and a chain type (Chain-Type).

1 is a block diagram of a conventional drum-type automatic tool changer, and FIG. 2 is a side view of the second tool changer of FIG. 1 .

As shown, in the conventional drum type automatic tool changer 100, a tool magazine 10 equipped with different tools 12 is located on the upper part of the spindle 40 so that the tool 12 can be exchanged quickly. Located between the tool magazine 10 and the main shaft 40, the first tool exchange part 20 and the second tool exchange part 30 that elevate or swing in conjunction with the tool magazine 10 and the main shaft 40 is located

The tool magazine 10 consists of a plurality of tool grippers 11 in which different tools 12 are individually held are continuously mounted along the circumferential direction.

Each of these tool grippers 11 is divided at intervals of 30° from the central axis, and consists of a total of 12, and is configured to rotate around a drive shaft by clamping different tools 12 .

This tool magazine 10 rotates the tool 12 clamped to the tool gripper 11 according to the number of the tool 12 selected in the program code of the machining center while rotating the tool 12 of the second tool changing unit 30. ) will stop at the exchange position.

As such, when the tool 12 of the tool magazine 10 is stopped at the exchange position, the second tool exchange unit 30 linked thereto is positioned at the standby position and then rotates to the exchange position.

The second tool changing unit 30 clamps the tool 12 in the clockwise direction and then rotates again in the counterclockwise direction to stop at the tool 12 replacement position of the first tool changing unit 20 located below. .

Here, the first tool exchange unit 20 is installed symmetrically around the change arm shaft 21 so that the main axis 40 is included in the turning radius so that the tool 12 is exchanged with the main axis 40 of the machining center. It consists of a first change arm 21a and a second change arm 21b that rotate with

Accordingly, the first tool changing part 20 is pivoted in association with the rotation of the second tool changing part 30, thereby clamping each tool 12 simultaneously on both sides, which is that the first change arm 21a is the main shaft ( 40), and at the same time, the second change arm 21b clamps the tool 12 of the second tool changing unit 30 to automatically exchange the tool.

However, in the conventional drum type automatic tool changer as described above, the weight of the tool magazine increases, the cost increases due to the increase in specifications of the servo motor operated by the tool magazine, and the mechanical efficiency decreases due to the increase in the moment of inertia. There is a problem.

Registered Patent Publication No. 10-0473553 (2005.03.08. Announcement)

The present invention is to solve the above problems, and reduces the load on the servo motor, which is the drive system of the automatic tool changer, by reducing the weight of the toolport, etc., and improves the driving force, as well as structural safety and durability of the automatic tool changer It is intended to provide a ring type automatic tool changer that can contribute to the improvement of lifespan.

The ring-type automatic tool changer of the present invention is provided with a ring-shaped rotating body, and a magazine in which a plurality of tall ports for accommodating tools are provided at equal angular intervals along the circumferential direction, and tools for accommodating tools A tool comprising a pair of holder blocks spaced apart from each other so that a receiving space is formed therein, and an elastic member disposed outside the pair of holder blocks to elastically press the pair of holder blocks in a mutually narrow direction A port, a first inclined block body having an inclined surface formed on one side, and formed to be inclined at an angle corresponding to the inclined angle of the inclined surface, one end being rotatably coupled to the inclined block body, and gripping the tool at both ends of the other end It is characterized in that a tool shifter including a rotary body having a rotary gripper and a second rotary gripper is provided.

In addition, the first and second rotary grippers have a 'L' shape, are rotatably coupled to the ends of the fingers, and have curved grooves formed inside to increase the contact area surrounding the tool to improve gripping force; One end is fixed while enclosing the hinge shaft, and the other end is fixed to the outer surface of the rotating finger, and it is characterized in that it includes a torsion spring with elasticity in the direction in which the rotating finger opens.

In addition, one side is provided in a state protruding from the outer surface of the finger, the other side is characterized in that it further comprises a stopper provided in a state in contact with the outer surface of the rotating finger.

In addition, it is characterized in that the curved groove formed in the rotary finger is provided with a rubber coating to prevent the tool from sliding.

In addition, a hollow portion is formed inside the holder block, and a reinforcing plate having a truss structure is provided in the hollow portion in the form of a partition wall.

The present invention has the effect that the weight of the entire magazine can be reduced.

In addition, the moment of inertia generated during magazine rotation can be reduced, so BT50-class tools can be installed up to 60Tools, and compared to the drum type, the machining and manufacturing area is minimized, which has the effect of reducing the manufacturing cost.

In addition, since the magazine rotation is less affected by the moment of inertia, the maximum tool weight can be increased with the performance of the existing servo motor, and there is an effect that can increase the maximum tool moment.

1 is a block diagram of a conventional drum type automatic tool changer.
Figure 2 is a side view of the second tool change unit of Figure 1;
Figure 3 is a perspective view of the present invention ring-type automatic tool changer.
Figure 4 is an enlarged view of the main part of Figure 3;
5 is an operation state diagram of the ring type automatic tool changer.
6 is a plan view of another embodiment of first and second rotary grippers;
7 is a plan view and a cross-sectional view taken along line AA of the toolport holder block.
8 is a plan view and a partially cut-away view of a state in which a roller and a belt are provided in the toolport.
9 is a cross-sectional view and a partially enlarged cross-sectional view showing the contact state of the belt and the tool on the basis of the line BB of FIG.

A preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. For reference, sizes of components, thicknesses of lines, etc. shown in the drawings referenced to describe the present invention may be expressed somewhat exaggeratedly 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 thus may vary according to user, operator intention, custom, and the like. Therefore, the definition of this term should be made based on the content throughout the present specification.

And in the present application, terms such as 'comprise' and 'have' refer to the existence of specific numbers, steps, operations, components, parts, or combinations thereof described in the specification, but one or more other It is to be understood that this does not preclude the possibility of the presence or addition of features or numbers, steps, operations, components, parts, or combinations thereof.

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 allows the disclosure of the present invention to be complete, and the scope of the invention to those of ordinary skill in the art It is provided for complete information.

Therefore, the present invention is to be described in detail in the specification, implementation examples (態樣, aspect) (or embodiments) can be applied to various changes and can have various forms. 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 or substitutes included in the technical spirit of the present invention, and the expression in the singular used herein is clearly different from the context. Unless otherwise indicated, plural expressions are included.

However, in describing the present invention, detailed descriptions of well-known or well-known functions or configurations will be omitted in order 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 ring-type automatic tool changer of the present invention, 4 is an enlarged view of the main part of FIG. 3, and 5 is an operation state diagram of the ring-type automatic tool changer.

As shown, the ring type automatic tool changer of the present invention includes a magazine 110 , a tool shifter 120 for exchanging the tool T1 , and a toll port 111 .

The magazine 110 is provided with a ring-shaped rotating body, and forms a process of rotating once when the exchange of the tools T1 and T2 is performed, and the tool T1 is accommodated on the circumferential surface of the magazine 110 . A plurality of toll ports 111 are provided at equal angular intervals along the circumferential direction.

The tool port 111 is provided to protrude from the inner wall of a pair of holder blocks 112 spaced apart from each other so that a tool storage space 111a in which the tool T1 is accommodated is formed therein, and the holder blocks 112 . The insertion rail 113 inserted into the groove G formed in the neck N of the tool T1 and the pair of holder blocks 112 are arranged outside the pair of holder blocks 112 to narrow each other. It includes an elastic member 114 for elastically pressing in the falling direction.

Since such a tool port 111 is lighter than a conventional mold port of a recessed shape, it is less affected by the moment of inertia when rotating the magazine, so that the maximum tool weight can be increased with the performance of the existing servo motor, There is a possible effect up to an increase in the maximum tool moment.

The tool shifter 120 exchanges the tool T1 while linearly moving along the radial direction of the magazine 110 by the driving unit 140 , and a servo motor is applied as a driving source of the driving unit 140 . .

In addition, the tool shifter 120 is rotatably coupled to the inclined block body 121 having an inclined surface 121a formed on one side thereof, and the inclined surface 121a of the inclined block body 121 by the rotation driving unit 128 . , a first rotary gripper 125 formed to be inclined at an angle corresponding to the inclination angle of the inclined surface 121a, one end rotatably coupled to the inclined block body 121, and gripping the tool at both ends of the other end. and a rotation body 122 having a second rotary gripper 126, each formed to be inclined at a first angle set to face each other, and bent at a second angle preset with respect to the inclined surface 121a, and first and second rotary grippers 125 and 126 for gripping the tool T1 .

The inclined block body 121 is configured to rotatably support the first and second rotary grippers 125 and 126 .

The rotation driving unit 128 serves to rotate the rotating body 122 and is driven by a servomotor.

The rotation body 122 has a through hole 122a formed therein, thereby reducing power loss caused by rotating the first and second rotary grippers 125 and 126 .

Looking at the operation relationship of the ring type automatic tool changer as described above,

The magazine 110 is rotated to position the second tool T2 to be used after the first tool T1 in front of the tool shifter 120 . Then, the tool shifter 120 is operated by the driving unit 140 to advance to a position where the first tool T1 is exchanged. At this time, among the first and second rotary grippers 125 and 126 , the first rotary gripper 125 coaxial with the first tool T1 grabs the first tool T1 and moves it to the replacement position.

Then, the rotary driving unit 128 is operated in one direction so that the empty second rotary gripper 126 comes to the front, and then moves to the main shaft (not shown) of the machine tool and attaches the second rotary gripper 126 to the second rotary gripper 126 . After mounting and unclamping the tool T2, it is raised

Then, the rotational driving unit 128 is operated in the reverse direction to position the first tool T1 in the front, then descends to the main shaft of the machine tool to clamp the first tool T1, and then tool exchange get out of position

Then, the second rotational driving unit 128 is operated to grip the second tool T2.

After the gripper 126 is brought forward, the driving unit 140 is operated to move the tool shifter 120 backward. As the tool shifter 120 moves backward, the new second tool T2 is accommodated in the tool port 111 of the magazine 110, and returns to the original position before tool change.

The ring-type automatic tool changer operated as above has the effect of reducing the weight of the entire magazine and reducing the moment of inertia that occurs when the magazine rotates. As it is minimized, it is possible to reduce the production cost, and as it is less affected by the moment of inertia when rotating the magazine, the maximum tool weight can be increased with the performance of the existing servo motor, and the effect and the tool that can increase the maximum tool moment Not only can the change time be significantly shortened, but the process of tool change is simplified, thereby improving the reliability of operation.

Hereinafter, another embodiment of the gripper will be described.

6 is a plan view of another embodiment of the first and second rotary grippers.

As shown, the first and second rotary grippers 125 and 126 of the present embodiment include rotary fingers 551a and 551b, a hinge shaft 552 , a torsion spring 553 , and a stopper 554 .

The rotating fingers 551a and 551b have a 'L' shape, are rotatably coupled to the ends of the fingers 51a and 51b, and have a contact area surrounding the tools T1 and T2 inside. A curved groove is formed to widen and improve gripping force.

A rubber coating is provided on the inner surface of the curved groove to prevent the tool from sliding.

The material of the rubber coating is, based on 100 parts by weight of acrylonitrile-butadiene rubber (NBR), 12 to 25 parts by weight of tetrafluoroethylene (TETRAFLOOROETHYLENE), 10 to 20 parts by weight of carbon master batch (CMB), 5-10 parts by weight of carbon black including SRF (semi reinforcing furnace), 1-3 parts by weight of stearic acid, 2-7 parts by weight of magnesium oxide (MgO), 10-20 parts by weight of dioctyl phthalate (DOP) Part by weight, Nobang-RD (Polymerized 2,2,4-trionethyl-1,2-dihydroquinoline) 2 to 4 parts by weight, 2 to 3 parts by weight of sulfur, 1.5 to 2.5 parts by weight of a sulfur accelerator do.

The rubber coating made of the above composition has excellent abrasion resistance and maximizes gripping efficiency by improving frictional force. It has the effect of reducing the occurrence of cracks).

The hinge shaft 552 is provided to pass through the rotating fingers 551a and 551b and the fingers 51a and 51b, and the rotating fingers 551a and 551b are formed at the ends of the fingers 51a and 51b. It has a rotating function.

One end of the torsion spring 553 is fixed while surrounding the hinge shaft 552, and the other end is fixed to the outer surface of the rotating fingers 551a and 551b, in the direction in which the rotating fingers 551a and 551b are opened. Elasticity is provided.

The stopper 554 is provided with one side protruding from the outer surfaces of the fingers 51a and 51b, and the other end being provided in contact with the outer surfaces of the rotating fingers 551a and 551b.

That is, the stopper 554 has a structure protruding from the outer surface of the fingers 51a and 51b in a 'C' shape, and thus has a function of limiting the opening angle of the rotating fingers 551a and 551b within a certain range. will do

Looking at the operating relationship of the rotary fingers provided in the first and second rotary grippers as described above,

As the first and second rotary grippers 125 and 126 are in contact with the tool, the rotary fingers are rotated and closed by a driving means (not shown), so that when the tools T1 and T2 are gripped, the rotary fingers 551a and 551b overcomes the elastic force of the torsion spring 553 and rotates the rotary finger with the hinge shaft 552 as a point.

When the rotary finger rotates, one end of the rotary finger rotates in a direction surrounding the tool to grip the tool, thereby improving the gripping force of the gripping part on the tool.

When the driving means is stopped, the rotating fingers 551a and 551b return to their original positions by the elastic restoring force of the torsion spring 553, and the finger-side end of the rotating finger pushes the tool, thereby increasing the efficiency of seating the tool in the tool port. is to improve

In the following embodiment, a light-weight structure of the holder block constituting the tool port will be described.

7 is a plan view and a cross-sectional view taken along the line A-A of the toolport holder block.

As shown, a hollow part is formed inside the holder block 112, and the reinforcing plate 400 having a truss structure is provided in the hollow part in the shape of a partition wall.

The holder block 112 of the toolport having such a structure does not easily deform due to shock or vibration, and the reinforcing plate 400 having a triangular structure is balanced with an external force as an axial force, so that no bending or shearing force occurs, By reducing the weight of the holder block, it is possible to reduce the overall weight of the tall pot and have the function to maintain high strength.

In the following embodiments, a structure for improving the gripping force of the toolport and the like will be described.

8 is a plan view and a partially cut-away view of a state in which a roller and a belt are provided in the toolport, and FIG. 9 is a cross-sectional view and a partially enlarged cross-sectional view showing the contact state between the belt and the tool based on the line B-B of FIG.

As shown, the feature of this embodiment is that the roller 610 and the belt 620 are provided inside the tool port 111 and the holder block 112 .

The roller 610 is provided in a rotatable state in the upper and lower portions of the holder block 112 .

The belt 620 is wound around the rollers 610 on both sides, is formed of a rubber material having elasticity, and a guide protrusion 621 is provided on the surface in contact with the tools T1 and T2, and the groove (G) of the tool. It guides the movement of the tool by being inserted into the

In addition, a pressing protrusion 622 having elasticity is formed on the surface of the belt 620 in contact with the tools T1 and T2. A vacuum adsorption plate 623 is provided on the upper surface of the 622 , and by vacuum adsorption on the outer surface of the tool, the gripping force of the tool port can be further improved.

Looking at the action and effect of the structure that improves the gripping force of the toolport as described above,

When the tools T1 and T2 are inserted into the tool port 111, the guide projection 621 is inserted into the groove G of the tool port to guide the tool, so that the position of the tool can be accurately moved. Exchange efficiency can be maximized.

In addition, by improving the tool gripping force of the toolport by the pressing protrusion 622 and the vacuum suction disk 623 that are in contact with the outer surface of the tool in a vacuum and compressed state, the position of the tool is changed in the toolport, so that the tool is exchanged. It is to have an action or effect to minimize the occurrence of errors or errors.

51a, 51b: Finger 110: Magazine
111; tool port 111a: tool storage space
112: holder block 113: insert rail
114: elastic member 120: tool shifter
121: inclined block body 121a: inclined surface
122: rotating body 122a: through hole
125: first rotary gripper 126: second rotary gripper
128: rotation driving unit 140: driving unit
400: reinforcing plate 551a, 551b: rotating finger
553: torsion spring 554: stopper
610: roller 620: belt
621: guide projection 622: compression projection
623: vacuum adsorption group N: neck
G: Groove T1, T2: Tool

Claims (5)

A magazine 110 provided with a ring-shaped rotating body and having a plurality of tall ports 111 accommodating tools on a circumferential surface thereof at equal angular intervals along the circumferential direction;
A pair of holder blocks 112 spaced apart from each other so that a tool storage space 111a in which a tool is accommodated is formed therein;
A tool port 111 disposed outside of the pair of holder blocks 112 and including an elastic member 114 that elastically presses the pair of holder blocks 112 in a mutually narrowing direction;
An inclined block body 121 having an inclined surface 121a formed on one side thereof;
A first rotary gripper 125 that is formed to be inclined at an angle corresponding to the inclination angle of the inclined surface 121a, one end is rotatably coupled to the inclined block body 121, and grips the tool at both ends of the other end, and A tool shifter (120) comprising a rotating body (122) having a second rotary gripper (126) is provided;
The first and second rotary grippers 125 and 126 are,
Rotating finger (551a) (551b) in the shape of a 'L', coupled to the ends of the fingers 51a and 51b so as to be rotatable, and formed with a curved groove inside to increase the gripping force by expanding the contact area surrounding the tool Wow,
One end is fixed while surrounding the hinge shaft 552, and the other end is fixed to the outer surface of the rotating fingers 551a and 551b, and a torsion spring with elasticity in the direction in which the rotating fingers 551a and 551b are opened ( 553);
One side is provided in a state protruding from the outer surface of the fingers (51a) (51b), and the other side further includes a stopper 554 provided in a state in contact with the outer surface of the rotating fingers (551a) (551b),
The curved grooves formed in the rotary fingers 551a and 551b are provided with a rubber coating to prevent the tool from sliding,
A hollow portion is formed inside the holder block 112, and a reinforcing plate 400 having a truss structure is provided in the hollow portion in a partition wall shape;
A roller 610 provided in a rotatable state in the upper and lower portions of the holder block 112, and
A belt 620 wound around the roller 610, formed of a rubber material having elasticity, and provided with a guide protrusion 621 on the surface in contact with the tool, and inserted into the groove G of the tool to guide the movement of the tool. Wow,
A ring, characterized in that a compression projection 622 having elasticity is formed on the surface of the belt 620 in contact with the tools T1 and T2, and a vacuum suction plate 623 is provided on the upper surface of the compression projection 622 Type automatic tool changer. delete delete delete delete

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