KR20220132778A - Workpiece turning device of machine tools - Google Patents

Abstract

A gripper holder rotating and gripping the outer circumference of a workpiece on a rotating tool holder of a turret on a tool base including the rotating tool holder, including a flow path for supplying cutting oil to the rotating tool holder, and having a spindle motor for rotating a tool mounted on the turret. The gripper holder operates a gripper having a built-in cylinder operating by cutting oil to grip the workpiece. When machining the rear side of the workpiece, the workpiece is gripped by the gripper holder and the workpiece is reversed by the spindle motor for tool rotation to chuck the workpiece on a chuck to realize a workpiece reversing device by using a cutting oil supply device and a tool rotating device of the tool base conventionally existing in a machine tool without having a workpiece reversing device such as a robot or a gantry loader. Also, the present invention can reduce the installation area of the machine tool by eliminating the need for arranging dedicated equipment when realizing the workpiece reversing device.

Description

Workpiece turning device of machine tools

The present invention relates to a device for reversing a workpiece in a machine tool, and more particularly, to a device for rotating a workpiece mounted on a chuck in the opposite direction by using a supply system for cutting oil contained in the machine tool.

In general, in small and medium-sized machine tools such as turning centers, a robot or a gantry loader is used to remove the finished workpiece from the chuck for back machining, then rotate the workpiece 180 degrees and mount it back on the chuck for back machining. make it possible to perform

On the other hand, if a robot or a gantry loader is not provided, the operator manually removes the workpiece from the chuck and then rotates the workpiece 180 degrees to mount it back on the chuck for back processing.

However, if a separate dedicated equipment such as a robot or a gantry loader is used, the price of the machine tool increases and the installation area also increases. In addition, there is a problem that a lot of work time is required when the worker manually removes the workpiece and then re-installs it.

On the other hand, in the prior art, as in Patent Document 1, a device for checking whether a tool clamp is installed by installing a dog and a sensor on the rear surface of the tool holding device of the tool is disclosed. have. Further, Patent Document 2 discloses a structure in which a pair of tool clamp grippers for clamping a tool are installed on a robot arm as a tool gripping device for loading a long tool into a collet. However, this device still does not solve the problems in terms of economics and installation space as much as using a robot.

Korean Patent Publication No. 10-2016-0136569 Korean Patent Publication No. 10-2016-0079069

The present invention is to solve the above problems, and an object of the present invention is to use a tool rotating device and a coolant supply device for a tool rest existing in a machine tool without having a workpiece reversing device such as a robot or a gantry loader. The purpose of this is to implement a workpiece reversing device.

In addition, an object of the present invention is to reduce the installation area of the machine tool by not arranging a dedicated facility in implementing the work reversing device.

The work reversing device of the machine tool of the present invention for solving the above problems,

A turret disposed on one side of the main shaft and movable in a direction perpendicular to the axis of rotation of the main shaft and parallel to the axis of rotation of the main shaft, the turret having a plurality of tool holders for mounting tools in the circumferential direction, and a rotating tool among the plurality of tool holders A tool rest including a holder and having a flow path supplying cutting oil to the rotating tool holder therein; an indexing motor rotating the turret by dividing the angle at the tool rest; and a spindle rotating the tool mounted on the turret In a machine tool equipped with a motor,

Install a gripper holder that grips the outer diameter of the workpiece and rotates on the rotating tool holder of the turret,

The gripper holder includes a holder fixing part inserted into the rotating tool holder of the turret and forming a body, and a gripper rotating part rotatably installed in front of the holder fixing part by receiving the rotational force of a spindle motor mounted on the tool rest. lose,

The holder fixing part includes a gripper holder rotating shaft having a front end connected to the gripper rotating unit and a rear end mechanically connected to transmit the rotational force of the spindle motor,

The gripper rotating part includes a pair of grippers operating in opposite directions to grip the workpiece at a tip end, and the pair of grippers are mechanically coupled to a cylinder operated by coolant supplied from a coolant pump.

In a preferred embodiment, the cylinders are installed on the inner bottom of the gripper rotating part in parallel to operate in opposite directions, and the cylinders are opposite to the cylinder chamber into which a reciprocating piston and cutting oil are introduced and the cylinder chamber. A piston rod formed in and a spring installed on the piston rod side to press the piston in the direction of the cylinder chamber,

The piston is arranged to act in a direction to open the gripper when coolant is supplied to the cylinder chamber, and to grip the gripper by the spring when coolant is not supplied to the cylinder;

A guide coupled to the piston and interlocking with the piston is installed on one side of each of the pistons,

The gripper is coupled to each guide in a vertical direction,

The cylinder chamber may communicate with a coolant flow path formed inside the gripper rotating part.

In a preferred embodiment, a plurality of fixing bolts for fixing the holder fixing part to the turret and a coolant input line connected to a coolant output line formed inside the turret are installed under the holder fixing part.

In a preferred embodiment, a bearing for rotationally supporting the rotation shaft of the gripper holder between the gripper holder and the holder fixing part is installed on the rotation shaft of the gripper holder.

In a preferred embodiment, the gripper is characterized in that the workpiece gripping surface is formed according to the shape of the workpiece.

In a preferred embodiment, a coolant flow path communicating with the cylinder chamber is formed in the holder fixing part and the gripper rotating part, and the cutting oil flow path of the gripper rotating part is a circumferential flow path formed on an outer circumferential surface of the gripper rotating part and inside the gripper rotating part It is formed radially to the outlet is characterized in that it is formed as an internal flow path connected to the cylinder chamber.

In a preferred embodiment, in the coolant flow path formed in the holder fixing part, the exit of the flow path is connected to the circumferential flow path of the gripper rotating part, and the inlet of the flow path is formed by the coolant input line formed under the holder fixing part, , A circular hydraulic seal for preventing oil leakage is inserted outside the flow path in the circumferential direction formed on the outer peripheral surface of the gripper rotating part to which the cutting oil flow path between the holder fixing part and the gripper rotating part is connected.

In a preferred embodiment, it is characterized in that it further comprises a part catcher for accommodating the falling workpiece by being released from the chuck jaw installed on one side of the main shaft and rotating it to a part box installed on one side of the body of the machine tool.

The present invention makes it possible to implement a workpiece reversing device using a tool rotating device and a coolant supply device for a tool rest existing in a machine tool without having a workpiece reversing device such as a robot or a gantry loader.

In addition, the present invention can reduce the installation area of the machine tool by not arranging a dedicated facility in implementing the work reversing device.

1 is an embodiment of the present invention, a perspective view of a related part for implementing a workpiece reversing device of a machine tool.
Figure 2 is an embodiment of the present invention, a perspective view of the workpiece inverting device-related parts in a state in which the workpiece gripped by the chuck is gripped.
3 is a conceptual diagram of a gripper holder driving according to an embodiment of the present invention.
4 is a perspective view of a tool rest on which a gripper holder is installed as an embodiment of the present invention.
5 is a perspective view of a gripper holder according to an embodiment of the present invention.
6 is an internal structural diagram of a gripper holder according to an embodiment of the present invention.
7 is a side view of a gripper holder according to an embodiment of the present invention.
8 is a front view of a gripper holder according to an embodiment of the present invention.
9 is a cross-sectional view taken along line AA of FIG. 8 .
FIG. 10 is a cross-sectional view taken along line BB of FIG. 7 .
11 is a cross-sectional view taken along line CC of FIG. 7 .
12 is a cross-sectional view taken along line DD of FIG. 7 .
13 is a cross-sectional view taken along line EE of FIG. 8 .
14 is a perspective view of the inside of a machine tool installed with a part catcher as an embodiment of the present invention.
15 is a perspective view of a main shaft of a machine tool in which a part catcher is installed as an embodiment of the present invention.
16 is a view showing an operation process of a workpiece reversing device using a gripper holder as an embodiment of the present invention.

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

Figure 1 is an embodiment of the present invention, a perspective view of a related part for implementing the workpiece 13 inverting device of the machine tool. Figure 2 is an embodiment of the present invention, a perspective view of the workpiece 13 in a state in which the workpiece 13 gripped by the chuck 11 is inverted and related parts.

As shown in Figures 1 and 2, the main shaft 10 of the machine tool is provided with a chuck jaw 12 (chuck jaw) for gripping the work piece 13, and is provided with a chuck 11 which rotates together with the work piece (13). do. A tailstock 14 is installed that can reciprocate in the direction of the rotation axis (X-axis) of the chuck 11 , and supports the rotation center of the tip of the workpiece 13 clamped to the chuck 11 . In addition, the chuck 11 is disposed at a right angle to the rotation axis (X axis) direction of the chuck 11 and moves in a direction perpendicular to the rotation axis (X axis) of the chuck 11 and parallel to the rotation axis (X axis) of the chuck 11 . A turret 21 having a plurality of tool holders 26 for mounting a tool in the circumferential direction, and a rotating tool holder 26 among the plurality of tool holders 26, and the rotating tool therein A tool rest 20 including a flow path for supplying cutting oil to the holder 26 is provided.

Meanwhile, the tool rest 20 includes an indexing motor 22 for rotating the turret 21 by dividing the angle, and a spindle motor 23 for rotating the tool mounted on the turret 21 . The rotating tool holder 26 of the turret 21 includes a gripper holder 30 for holding the outer diameter of the workpiece 13 .

3 is a conceptual diagram of a driving of the gripper holder 30 according to an embodiment of the present invention. 4 is a perspective view of the tool rest 20 on which the gripper holder 30 is installed as an embodiment of the present invention.

3 and 4 , the gripper holder 30 is connected to the coolant pump 15 of the machine tool through the coolant flow passage 39 formed inside the tool rest 20 . In addition, the output end of the spindle motor 23 mounted on the tool rest 20 is connected to the bevel gear box 24 installed at the center of rotation of the tool rest 20 . The output end of the bevel gear box 24 is connected to the clutch 25 installed in the tool holder 26 direction of the turret 21 on which the gripper holder 30 is mounted. The output end of the clutch 25 is coupled to the rear end of the gripper holder 30 mounted on the turret 21 .

5 to 13 are views showing the structure of the gripper holder 30 .

First, as shown in FIG. 5 , the gripper holder 30 is inserted into the rotating tool holder 26 of the turret 21 and includes a holder fixing part 32 forming a body, and a front of the holder fixing part 32 . It consists of a gripper rotating part 31 that is rotatably installed on the . A gripper holder rotating shaft 33 having a front end connected to the gripper rotating unit 31 and a rear end having a clutch connection unit 35 coupled to an output end of the clutch 25 is provided inside the holder fixing unit 32 . do.

In addition, a plurality of fixing bolts 36 for fixing the holder fixing part 32 to the turret 21 are provided at a lower portion of the holder fixing part 32 in contact with the turret 21 , and inside the turret 21 . The inlet of the coolant input line 37 connected to the formed coolant output line 38 is installed.

In addition, as shown in FIGS. 9, 10 and 12 , a bearing 34 is installed on the gripper holder rotation shaft 33 to rotatably support the gripper holder rotation shaft 33 between the holder fixing part 32 and the gripper holder rotation shaft 33 . .

5 to 13, a pair of grippers 46 operating in opposite directions to grip the workpiece 13 are installed at the tip of the gripper rotating part 31, and the pair of grippers One end of the gripper 46 is installed as a pair on the inner bottom of the gripper rotating part 31 in parallel to operate in the opposite direction, and is mechanically connected to a pair of cylinders 40 operated by cutting oil. .

As shown in FIGS. 10 to 13 , the cylinder 40 includes a piston 41 reciprocating therein, a cylinder chamber 42 into which cutting oil is introduced, and a piston rod 43 formed on the opposite side of the cylinder chamber 42 . ) and a spring 44 installed on the piston rod 43 side to press the piston 41 toward the cylinder chamber 42 .

The piston 41 acts in a direction to open the gripper 46 when cutting oil is supplied to the cylinder chamber 42 , and when the cutting oil is not supplied to the cylinder 40 , the piston 41 is operated by the spring 44 . The gripper 46 is configured to act in a gripping direction.

The cylinder chamber 42 communicates with the coolant flow passage 39 formed inside the gripper rotating part 31 .

In addition, a guide 45 coupled to the piston 41 and interlocking with the piston 41 is installed on one side of each of the pistons 41 . A gripper 46 is coupled to each of the guides 45 in a vertical direction.

In addition, the gripper 46 for gripping the workpiece 13 can be manufactured exclusively by matching the shape of the gripping surface to the shape of the workpiece 13 .

Meanwhile, as shown in FIGS. 9 and 10, a coolant flow path 39 communicating with the cylinder chamber 42 is formed in the holder fixing part 32 and the gripper rotating part 31, but the gripper rotating part ( The coolant flow path 39 of 31 ) has a circumferential flow path formed on the outer circumferential surface of the gripper rotating part 31 and a radially formed inside the gripper rotating part 31 , and an outlet is an internal flow path connected to the cylinder chamber 42 . is formed with

In addition, in the coolant flow path 39 formed in the holder fixing part 32 , the exit of the flow path is connected to the circumferential flow path of the gripper rotating part 31 , and the inlet of the flow path is located at the lower part of the holder fixing part 32 . The coolant input line 37 is formed.

In addition, the outer circumferential flow path formed on the outer circumferential surface of the gripper rotating part 31 to which the coolant flow path 39 between the holder fixing part 32 and the gripper rotating part 31 is connected has a circular shape for preventing oil leakage. A hydraulic seal 47 is inserted.

On the other hand, FIG. 14 is a perspective view of the inside of the machine tool in which the part catcher 16 is installed as an embodiment of the present invention. 15 is a perspective view of the main shaft 10 of the machine tool in which the part catcher 16 is installed as an embodiment of the present invention. 14 and 15, one side of the main shaft 10 accommodates the workpiece 13 that is released from the chuck jaw 12 and falls, and rotates to a part box 17 installed on one side of the body of the machine tool. A part catcher 16 is installed.

Hereinafter, the operation of the gripper holder 30 configured as in the above embodiment will be described. 16 is a view showing the operation process of the workpiece 13 reversing device using the gripper holder 30 as an embodiment of the present invention. As shown in FIG. 16 , when one side of the workpiece 13 is finished in a state in which the workpiece 13 is gripped by the chuck jaws 12 of the chuck 11 , the indexing motor 22 of the tool rest 20 operates It rotates to bring the gripper holder 30 mounted on the tool holder 26 of the turret 21 into a position aligned with the workpiece 13 . Subsequently, the coolant pump 15 operates to supply coolant to the cylinder chamber 42 through the coolant flow path 39 of the holder fixing part 32 and the gripper rotating part 31 . The cutting oil supplied to the cylinder chamber 42 presses the piston 41 to press the spring 44 installed on the piston rod 43 side, and moves the guide 45 coupled to the piston 41 . As the guide 45 moves, a pair of grippers 46 vertically installed on the guide 45 are opened to grip the workpiece 13 (a).

Then, the tool rest 20 advances in the direction (Y-axis) of the workpiece 13 so that the workpiece 13 is positioned inside the open gripper 46 . Then, when the supply of coolant from the coolant pump 15 is stopped, the coolant filled in the chamber of the cylinder 40 is drained to a coolant tank (not shown) through the coolant flow passage 39, and a spring installed on the piston rod 43 side ( 44) presses and retracts the piston 41, so that the guide 45 coupled to the piston 41 also moves backwards, so that the gripper 46 attached to the guide 45 retracts to grip the workpiece 13 (b)

Subsequently, as the chuck jaws 12 of the main shaft 10 are opened, the workpiece 13 is separated from the chuck 11 and held by the gripper 46 . Then, as the tool rest 20 retracts in the axial direction (X-axis) of the chuck 11 and the gripper holder 30 also moves, the workpiece 13 is pulled out from the chuck jaw 12 (c).

Then, the spindle motor 23 of the tool rest 20 rotates so that the rotational force of the output shaft of the spindle motor 23 is transmitted through the bevel gear box 24 and the clutch 25 to the clutch connection part 35 of the gripper holder rotation shaft 33 is rotated 180 degrees to turn the workpiece 13 in the opposite direction on the axis of rotation (X axis). (d)

Then, the tool rest 20 moves in the direction of the rotational axis (X-axis) of the chuck 11 together with the gripper holder 30 holding the workpiece 13 and grabs the workpiece 13 rotated in the opposite direction with the chuck jaws 12. Insert into the chucking position of The chuck jaws 12 are then actuated to chuck the workpiece 13 . When the chucking of the workpiece 13 is completed, the coolant pump 15 operates to supply coolant to the cylinder chamber 42 through the coolant flow path 39 of the holder fixing part 32 and the gripper rotating part 31 . The cutting oil supplied to the cylinder chamber 42 presses the piston 41 to press the spring 44 installed on the piston rod 43 side, and moves the guide 45 coupled to the piston 41 in the opening direction. As the guide 45 moves in the opening direction, the pair of grippers 46 installed at right angles to the guide 45 are opened and the workpiece 13 is separated from the gripper 46 and chucked in the chuck jaw 12 . to be in a state of being Then, the tool rest 20 is moved in the reverse (Y-axis) direction to move the gripper 46 to a position where it is not interfered with by the workpiece 13 . At the same time, when the coolant supply from the coolant pump 15 is stopped and the coolant filled in the chamber of the cylinder 40 is drained into the coolant tank (not shown) through the coolant flow passage 39 , the spring installed on the piston rod 43 side A state in which the guide 45 coupled to the piston 41 also moves together while the piston 41 is retracted by the pressurization of the 44, so that the gripper 46 attached to the guide 45 does not grip the workpiece 13 It shrinks in and returns to its original state. (e)

On the other hand, in this embodiment, the coolant discharge pressure of the coolant pump 15 is set to 10 bar that can overcome the pressing force of the spring 44 and move the piston 41, so that the workpiece 13 of about 5 to 8 kg. was made to be gripped. In another embodiment, the discharge pressure of the coolant pump 15 of the machine tool can be set variously from 4 bar to 70 bar, and in this case, the spring 44 is lower than the discharge pressure of the coolant. ), the gripper 46 can smoothly grip the workpiece 13 by selecting a constant.

On the other hand, when the operation of the coolant pump 15 of the machine tool is stopped, the pressure inside the flow passage is lost as the coolant in the flow passage is directly drained due to the nature of the flow passage. Accordingly, the gripper 46 grips the workpiece 13 by the urging force of the spring 44 .

In addition, the spindle motor 23 that rotates the workpiece 13 has a built-in encoder for directional and synchronous control machining, so that the gripper holder 30 can be accurately reversed at a 180 degree position.

On the other hand, as shown in FIGS. 14 and 15 , when the processing of the workpiece 13 held by the chuck 11 is completed, the part catcher 16 installed on one side of the main shaft 10 is rotated to rotate the workpiece ( 13) to the lower part. Subsequently, as the chucking of the chuck jaw 12 is released, the workpiece 13 falls and is contained in the part catcher 16 . Subsequently, the part catcher 16 rotates and unloads the loaded workpiece 13 into the part box 17 installed on one side of the machine tool, thereby automating the processing operation of the workpiece 13 .

On the other hand, as another embodiment, if the bar feeder 18 and the part catcher 16 for continuously supplying the long workpiece 13 in a round bar state are provided, the continuous Automated processes become possible.

As described above, the present invention uses the tool rotation device and the coolant supply device of the tool rest 20 existing in the machine tool without having a workpiece 13 reversing device such as a robot or a gantry loader. It makes it possible to implement the work piece 13 reversing device.

In addition, the present invention can reduce the installation area of the machine tool by not arranging a dedicated facility in implementing the workpiece 13 reversing device.

10: spindle
11: chuck
12: Chuck Joe
13: Workpiece
14: tailstock
15: Part Catcher
16: Part Box
17: coolant pump
20: tool rest
21: turret
22: indexing motor
23: spindle motor
24: bevel gear box
25: clutch
26: tool holder
30: gripper holder
31: gripper rotating part
32: holder fixing part
33: gripper holder rotation axis
34: bearing
35: clutch connection part
36: fixing bolt
37: coolant input line
38: coolant output line
39: coolant flow path
40: cylinder
41: piston
42: cylinder chamber
43: piston rod
44: spring
45: guide
46: gripper
47: hydraulic seal

Claims (8)

a turret disposed on one side of the main shaft, movable in a direction perpendicular to the main shaft rotation axis and parallel to the main shaft rotation axis, and having a plurality of tool holders for mounting tools in the circumferential direction; and a rotating tool holder among the plurality of tool holders Including, inside, a tool rest including a flow path for supplying cutting oil to the rotating tool holder, an indexing motor rotating the turret by dividing the angle, and a spindle motor rotating the tool mounted on the turret in the tool rest. In the provided machine tool,
Install a gripper holder that grips the outer diameter of the workpiece and rotates on the rotating tool holder of the turret,
The gripper holder includes a holder fixing part inserted into the rotating tool holder of the turret and forming a body, and a gripper rotating part installed in front of the holder fixing part and rotating by receiving rotational force of a spindle motor mounted on the tool rest, ,
A gripper holder rotating shaft having a front end connected to the gripper rotating unit and a rear end mechanically connected to the spindle motor to transmit rotational force is provided inside the holder fixing unit,
The gripper rotating part includes a pair of grippers operating in opposite directions to grip the workpiece at a tip end, and the pair of grippers are mechanically coupled to a cylinder operated by coolant supplied from a coolant pump. of the workpiece reversing device. According to claim 1, wherein the cylinder is installed in a pair in parallel to operate in a direction opposite to each other in the gripper rotating part, the cylinder is formed opposite to the cylinder chamber and the cylinder chamber into which the reciprocating piston and cutting oil are introduced. A piston rod and a spring installed on the piston rod side to press the piston in the direction of the cylinder chamber,
The piston is disposed to act in a direction to open the gripper when coolant is supplied to the cylinder chamber, and to grip the gripper by the spring when coolant is not supplied to the cylinder;
A guide coupled to the piston and interlocking with the piston is installed on one side of each of the pistons,
The gripper is coupled to each guide in a vertical direction,
The cylinder chamber is a workpiece reversing device of a machine tool, characterized in that the communication with the coolant flow path formed inside the gripper rotating part. According to claim 1, wherein a plurality of fixing bolts for fixing the holder fixing part to the turret, and a coolant input line connected to the coolant output line formed inside the turret are installed in the lower part of the holder fixing part The workpiece reversing device of the machine. The work reversing device for a machine tool according to claim 1, wherein a bearing for rotationally supporting the rotation shaft of the gripper holder between the gripper holder rotation shaft and the holder fixing part is installed. According to claim 1, wherein the gripper is a workpiece reversing device for a machine tool, characterized in that the workpiece gripping surface is formed according to the shape of the workpiece. According to claim 1, wherein the holder fixing portion and the gripper rotating portion is formed with a coolant flow passage communicating with the cylinder chamber, the coolant flow passage of the gripper rotary portion is a circumferential flow passage formed on an outer circumferential surface of the gripper rotating portion and the gripper rotating portion It is radially formed therein and the outlet is a workpiece reversing device of a machine tool, characterized in that formed as an internal flow path connected to the cylinder chamber. The coolant flow path of claim 6, wherein an outlet of the flow path is connected to a circumferential flow path of the gripper rotating part, and an inlet of the flow path is formed by the coolant input line formed under the holder fixing part. and a circular hydraulic seal for preventing oil leakage is inserted outside the flow path in the circumferential direction formed on the outer peripheral surface of the gripper rotating part to which the cutting oil flow path between the holder fixing part and the gripper rotating part is connected. Workpiece reversing device. The machine tool according to claim 1, further comprising a part catcher for accommodating the falling workpiece after being released from the chuck jaw installed on one side of the main shaft and rotating it to a part box installed on one side of the body of the machine tool. reverse device.

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