KR20230121302A - Workpiece unloading device of machine tool - Google Patents

Abstract

The rotary drive unit that rotates and drives the part catcher of the machine tool is composed of a servo motor and a reducer, and a rotary shaft and a rotary arm are installed at the tip of the reducer. By having a part catcher in the form of a bar that forms a magnetic force, when the workpiece processing is completed on the main shaft, the electromagnet is excited and the workpiece is attached to the part catcher and discharged to the workpiece outlet installed outside the gongja machine, from the main shaft of the machine tool. In the process of attaching and ejecting the workpiece, it is possible to prevent damage to the workpiece and machine tools by safely collecting the workpiece without dropping it by magnetic force, and it is easy to discharge the workpiece from the chuck to the outside regardless of the size of the workpiece. In addition, since the structure of the workpiece discharging device is simple, the size of the machine tool can be reduced and the manufacturing cost can be reduced.

Description

Workpiece unloading device of machine tool}

The present invention relates to a device for discharging a workpiece that is gripped by a spindle of a machine tool and has been processed to the outside of the machine tool.

In a machine tool such as a turning center, after gripping a workpiece on a rotating spindle and completing machining, the workpiece must be released from the chuck clamp state of the spindle and discharged to the outside of the machine tool. At this time, in order to continuously process a relatively small and light workpiece, a workpiece discharging device is installed on one side of the machine tool to receive the processed workpiece from the main shaft and discharge it to the outside.

As known in the art, such a workpiece discharge device is installed on a frame near the main axis of a machine tool, and a link mechanism that rotates between the main axis and a workpiece discharge port, and a box for housing the workpiece is mounted at the tip of the link to process the workpiece on the main axis. When this is completed, the box for storing the workpiece is rotated to the lower part of the workpiece, the workpiece falling by the workpiece gripping release operation of the main shaft is stored in the box, and the workpiece stored in the storage box is unloaded to the discharge port by rotating the storage box again. .

However, such a workpiece discharge device must safely store the workpiece from the main shaft and maintain the posture of the storage box in the direction of gravity so that the workpiece stored in the storage box does not spill during the process of rotating the storage box in the direction of the discharge port. Since the storage box must be rotated in order to unload the workpiece, it has no choice but to have a complicated structure. In addition, the size or shape of the storage box should be specially considered according to the size of the workpiece. Therefore, there is a problem in that the size of the storage box increases and the structure becomes complicated.

On the other hand, such a workpiece discharge device is known from patent documents introduced below. Since the introduction of the following patent documents is based on the terms used in the patent documents, each patent document may be different from each other, and the expression may be different from the terms used in this invention.

First, Patent Document 1 provides a first arm to be linearly movable and rotatable in conjunction with a spline installed to be linearly movable and rotatable, and a second arm to be rotatably interlocked with the first arm, and the tip of the second arm. It is a structure in which a bucket part is installed to recover the processed material from the spindle and discharge it to the conveyor. Here, the bucket unit has a structure in which a workpiece is stored and discharged in the form of an openable box. In addition, the structure includes a cam and a cam box for rotating the cam to linearly move and rotate the bucket. Therefore, as the bucket unit for accommodating the workpiece is manufactured in an openable structure, the bucket becomes excessively large and the mechanism for driving the bucket becomes complicated.

In addition, Patent Document 2 discloses a workpiece recovery device having a lower cover that is opened and closed by white paper and a spring at the bottom of a bucket for moving a workpiece, and having first and second rotation shafts pivotally connected while maintaining the bucket in a vertical state. are doing However, this device forms a lower cover to prevent the workpiece from escaping from the bucket, as in the structure of Patent Document 1, and has an unavoidable limitation in that the structure is complicated and the size of the bucket is limited by providing a structure for opening and closing it.

In addition, in another patent document 3, a rotation support and a support bar having a link structure that rotates by a hydraulic motor are installed on a machine tool body, and a part receiving case is rotatably installed at the tip of the support bar to rotate the workpiece, and inside the parts receiving case It is a structure with a built-in weight body that holds the center of gravity when the workpiece is stored. In this structure, since the component receiving case always maintains a vertical position due to the weight, an additional structure for tilting the component receiving case is required in order to discharge the stored workpiece, so there is also a problem of structural complexity.

Korean Patent Publication No. 10-2020-0119170 Korean Patent Publication No. 10-2011-0013754 Korea Utility Model Registration No. 20-0117935

An object of the present invention for solving the above problems is that the workpiece does not fall during the process of discharging the machined workpiece from the main axis of the machine tool, can be discharged regardless of the size of the workpiece, and has a simple structure. It aims to implement an exhaust device.

The workpiece discharge device of the machine tool of the present invention to solve the above problems,

A rotation drive installed on one side of the machine tool frame of the machine tool spindle;

A rotation shaft connected to the output end of the rotation drive unit;

A link orthogonally connected to the tip of the rotating shaft;

A bar-shaped part catcher rotatable at the tip of the link, installed in a direction parallel to the main shaft of the machine tool, and selectively forming a magnetic force to attach and discharge a workpiece from the chuck of the main shaft to an outer surface;

It is installed on the outer frame of the machine tool and includes a workpiece outlet for recovering the workpiece attached to the part catcher by a magnetic force to the outside of the machine tool when the part catcher is rotated outward of the machine tool.

In a preferred embodiment, the rotary driving unit includes a servomotor for rotating the rotary shaft so that the part catcher rotates between the chuck and the workpiece outlet according to a command provided from a control unit of a machine tool, and rotation of the servomotor is reduced and rotational force is reduced. is made of a speed reducer that increases, and the output end of the speed reducer is characterized in that it is directly connected to the rotation shaft.

In a preferred embodiment, the rotating shaft has a built-in cylinder operating in multiple stages to adjust the length in the axial direction, and the cylinder is configured to perform the rotation according to the length and axial position information of the workpiece gripped by the chuck provided from the machine tool control unit. It is characterized in that the length of the rotating shaft is adjusted.

In a preferred embodiment, as the rotating shaft rotates, the link rotates between a workpiece gripped by the chuck of the main shaft and the workpiece outlet, and the length of the link is the axis of the main shaft from a position coupled to the rotating shaft. It is characterized in that it is formed equal to or smaller than the distance to.

In a preferred embodiment, the part catcher is rotatably coupled to the tip of the link by inserting a bearing, an electromagnet is installed in the longitudinal direction, and a contact portion is formed on the outside in the circumferential direction to contact the workpiece.

In a preferred embodiment, the contact portion is characterized in that it has a polygonal shape to enlarge the contact area with the workpiece.

In a preferred embodiment, the contact portion is characterized in that it has a concave shape to enlarge the contact area with the workpiece.

In a preferred embodiment, the electromagnet is supplied with power to form a magnetic field when a command to eject the workpiece gripped by the chuck is applied together with a signal from the control unit of the machine tool that processing of the workpiece is completed, thereby moving the workpiece, which is a magnetic material, to the contact portion. It is characterized by attachment.

In a preferred embodiment, the contact part is characterized in that an elastic coating made of synthetic resin capable of absorbing shock is overlaid in order to prevent damage to the processing surface of the workpiece due to impact when the workpiece is attached by magnetic force.

In a preferred embodiment, the workpiece outlet is characterized in that an inlet leading the workpiece to the outside of the workpiece outlet protrudes into the inside of the machine tool.

The workpiece discharge device of the present invention can prevent damage to the workpiece and the machine tool by safely recovering the workpiece without dropping it by the magnetic force of the electromagnet during the process of acquiring and discharging the workpiece from the main shaft of the machine tool. In addition, according to the present invention, it is easy to discharge the workpiece from the chuck to the outside regardless of the size of the workpiece to be discharged. In addition, the present invention can reduce the size of the machine tool and reduce the manufacturing cost because the structure of the workpiece discharge device is simple.

1 is a perspective view of a workpiece discharge device installed in a machine tool as an embodiment of the present invention.
Figure 2 is an embodiment of the present invention, a perspective view of a workpiece discharge device installed in the machine tool viewed from another angle.
3 is a perspective view of various types of workpiece catchers applied to a workpiece discharging device as an embodiment of the present invention.
4 is an operating state diagram of a workpiece discharge device as an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to FIGS. 1 to 4 . 1 is a perspective view of a workpiece discharge device installed in a machine tool as an embodiment of the present invention. Figure 2 is an embodiment of the present invention, a perspective view of a workpiece discharge device installed in the machine tool viewed from another angle. 3 is a perspective view of various types of workpiece 22 catchers applied to a workpiece discharging device as an embodiment of the present invention. 4 is an operating state diagram of a workpiece discharge device as an embodiment of the present invention.

As shown in Figures 1 and 2, the workpiece discharging device of the present invention is connected to the rotary drive unit 30 installed in the machine tool frame 10 on one side of the machine tool spindle 20 and the output end of the rotation drive unit 30. A rotary shaft 40 that is, a rotary arm 50 orthogonally connected to the front end of the rotary shaft 40, rotatable at the front end of the rotary arm 50 and parallel to the main shaft 20 of the machine tool A bar-type parts catcher 60 installed in the direction and selectively forming a magnetic force to attach and discharge the workpiece 22 from the chuck 21 of the main shaft 20 to the outer surface do.

In addition, the workpiece discharging device of the present invention removes the workpiece 22 attached to the outer frame 10 of the machine tool by magnetic force when the part catcher 60 rotates outwardly of the machine tool. Install a workpiece discharge port 70 that is recovered to the outside of the machine tool.

The rotation driving unit 30 of the workpiece discharging device of the present invention is composed of a servo motor 31 and a reducer 32, and an output end of the reducer 32 is directly connected to the rotation shaft 40. In this way, by configuring the rotary driving unit 30 with the servo motor 31, the part catcher 60 rotated by the rotary driving unit 30 is gripped by the chuck 21 of the main shaft 20 and the work 22 and the workpiece 22 can be brought close to the workpiece discharge port 70. That is, depending on the size of the outer diameter of the workpiece 22 gripped by the chuck 21 of the main shaft 20, the distance at which the part catcher 60 can approach the workpiece 22 may vary, and at this time, the servomotor ( 31) by precisely adjusting the angle of rotation of the rotating shaft 40 connected to the rotating arm 50 that rotates the part catcher 60 by controlling the rotation of the part catcher 60 and the workpiece 22 gripped by the main shaft 20 ) can be controlled as close as possible.

In addition, by disposing the reducer 32 at the output end of the servomotor 31 of the rotation drive unit 30, the rotation of the servomotor 31 can be reduced and the rotational force can be increased.

On the other hand, the rotary driving unit 30 may use a stepping motor capable of adjusting the rotation angle instead of the servo motor 31 .

On the other hand, the servo motor 31 or the stepping motor constituting the rotating head unit in this way has a driver (not shown) for controlling the rotation of the workpiece gripped by the chuck 21 provided from the control unit or numerical control device of the machine tool. According to the diameter information of (22), the part catcher 60 can be rotated between the workpiece outlet 70 at a position closest to the outer diameter side of the workpiece 22 gripped by the chuck 21.

In addition, the rotation shaft 40 connected to the output end of the rotation drive unit 30 of the workpiece discharge device of the present invention is installed to extend in a direction parallel to the axis of the main shaft 20, and is transmitted via the reducer 32 It rotates according to the rotation direction of the servomotor 31 to be. In addition, the length of the rotary shaft 40 extends to the position of the workpiece 22 gripped by the chuck 21 of the main shaft 20 .

In addition, the rotating shaft 40 includes a length adjusting means for adjusting the length in the axial direction therein. The length adjusting means adjusts the length of the rotating shaft 40 by incorporating a cylinder 41 operating in multiple stages inside the rotating shaft 40. The length adjusting means of the rotary shaft 40 controls the internal cylinder 41 according to the length and axial position information of the workpiece 22 gripped by the chuck 21 provided from the machine tool control unit or the numerical control device to control the main shaft. The length of the rotating shaft 40 may be adjusted in correspondence with the axial position of the workpiece 22 gripped by the chuck 21 of (20).

In addition, the rotary arm 50 orthogonally connected to the front end of the rotation shaft 40 of the present invention workpiece discharge device has its front end attached to the chuck 21 of the main shaft 20 as the rotation shaft 40 rotates. It rotates between the gripped workpiece 22 and the workpiece outlet 70, and the length of the rotary arm 50 is the same as the distance from the position coupled to the rotary shaft 40 to the axis of the main shaft 20, or form small That is, when the rotary arm 50 rotates in the direction of the workpiece 22 held by the chuck 21 according to the rotation of the rotary shaft 40, the tip of the rotary arm 50 is positioned at the center of the workpiece 22. do not deviate from

In addition, in the workpiece discharge device of the present invention, a bar-shaped part catcher 60 installed in a direction parallel to the main shaft 20 of the machine tool at the front end of the rotating arm 50 and selectively generating magnetic force is shown in FIG. As shown, a bearing 61 is inserted and rotatably coupled to the front end of the rotary arm 50, and an electromagnet 62 is installed in the longitudinal direction therein. In addition, the outer contact portion 63 in the circumferential direction contacting the workpiece 22 in the bar-shaped part catcher 60 is a polygonal structure or workpiece 22 in order to expand the contact area with the round bar or cylindrical workpiece 22. ) can be configured in a concave shape similar to the curvature of

Meanwhile, power is supplied to the electromagnet 62 when a command to eject the workpiece 22 held by the chuck 21 is applied together with a signal indicating that processing of the workpiece 22 is completed from the control unit or numerical control device of the machine tool. A magnetic field is formed to attach the workpiece 22, which is a magnetic material, to the outer contact portion 63 in the circumferential direction of the part catcher 60.

In addition, the bearing 61 inserted into the front end of the part catcher 60 uses a sliding bearing or a rolling bearing, so that the workpiece 22 attached to the contact portion 63 of the part catcher 60 is moved by its own weight by its own force. Together with the part catcher 60, it rotates downward in the direction of gravity.

On the other hand, the contact portion 63 of the part catcher 60 is made of synthetic resin capable of absorbing shock in order to prevent damage to the processing surface of the workpiece 22 due to impact when the workpiece 22 is attached by magnetic force. can be overlaid with an elastic sheath.

In addition, in the workpiece discharge device of the present invention, the workpiece discharge port 70 for recovering the workpiece 22 to the outside of the machine tool when the part catcher 60 is rotated to the outside of the machine tool on the outer frame 10 of the machine tool As shown in FIGS. 1, 2, and 4, when the workpiece 22 attached to the part catcher 60 is input, the inlet 71 that guides the workpiece 22 to the outside of the workpiece outlet 70 is the workpiece. It is formed by protruding into the machine.

On the other hand, the operation of the device for recovering the workpiece 22 of the present invention formed as the configuration of the above embodiment is,

The servo motor 31 rotates to rotate the rotary shaft 40 and the rotary arm 50, and the part catcher 60 mounted on the front end of the rotary arm 50 is attached to the chuck 21 of the main shaft 20. When approaching the gripped workpiece 22 that has been processed, the chuck 21 grips the workpiece 22 by the control unit or the numerical control device and applies magnetic force to the electromagnet 62 inside the part catcher 60 at the same time as the workpiece ( 22) is attached to the contact portion 63 of the part catcher 60.

Subsequently, the workpiece 22 attached to the part catcher 60 rotates downward in the direction of gravity while the bearing 61 at the front end of the part catcher 60 rotates by its own weight.

Subsequently, the rotary shaft 40 is rotated by the rotation of the servomotor 31 to rotate the rotary arm 50 at the tip of the rotary shaft 40, and the part catcher 60 is rotated by the rotation of the rotary arm 50 While maintaining the magnetic force, the attached workpiece 22 is moved to the upper part of the inlet 71 of the workpiece outlet 70.

At this time, when the axial position of the part catcher 60 is different from the position of the inlet 71 of the workpiece outlet 70, the cylinder 41 inside the rotary shaft 40 is stretched and contracted by the controller or numerical control device. By adjusting the position of the rotary shaft 40 in the axial direction, the position of the part catcher 60 is adjusted to match the position of the inlet 71 of the workpiece outlet 70. At this time, the extension distance of the cylinder 41 inside the rotary shaft 40 is controlled according to the position of the workpiece 22 gripped by the chuck 21 provided from the controller or numerical control device.

Then, by removing the magnetic field in the electromagnet 62 inside the part catcher 60 by the control signal of the control unit or the numerical control device, the work 22 attached to the part catcher 60 in a suspended form is part catcher 60 The workpiece 22 is recovered by dropping from the workpiece outlet 70 into the inlet 71 of the workpiece outlet 70.

As described in the above embodiment, the workpiece discharge device of the present invention does not drop the workpiece 22 by the magnetic force of the electromagnet 62 in the process of acquiring and discharging the workpiece 22 from the main shaft 20 of the machine tool. It is possible to prevent damage to the workpiece 22 and the machine tool by safely recovering it without In addition, according to the present invention, it is easy to discharge the workpiece 22 from the chuck 21 to the outside regardless of the size of the workpiece 22 to be discharged. In addition, the present invention can reduce the size of the machine tool and reduce the manufacturing cost because the structure of the workpiece discharge device is simple.

10 frames
20 main axis
21 ships
30 rotary drive
31 Servo Motor
32 reducer
40 axis of rotation
41 cylinder
50 links
60 Part Catcher
61 bearing
62 electromagnet
63 contact
70 workpiece outlet
71 entrance

Claims (10)

A rotary drive installed on one side of the machine tool frame of the machine tool spindle;
A rotation shaft connected to the output end of the rotation drive unit;
A link orthogonally connected to the tip of the rotating shaft;
A bar-shaped part catcher rotatable at the tip of the link, installed in a direction parallel to the main shaft of the machine tool, and selectively forming a magnetic force to attach and discharge a workpiece from the chuck of the main shaft to an outer surface;
It is installed on the outer frame of the machine tool and includes a workpiece discharge port for recovering the workpiece attached to the part catcher by magnetic force to the outside of the machine tool when the part catcher rotates to the outside of the machine tool. Workpiece discharging device of the machine tool. The method of claim 1, wherein the rotary driving unit includes a servomotor for rotating the rotary shaft so that the part catcher rotates between the chuck and the workpiece outlet according to a command provided from a control unit of a machine tool, and rotation of the servomotor is reduced. The workpiece discharge device of the machine tool, characterized in that the rotational force is made of a reducer that increases, and the output end of the reducer is directly connected to the rotation shaft. The method of claim 1, wherein the rotary shaft has a built-in cylinder that operates in multiple stages to adjust the length in the axial direction, and the cylinder is provided from the machine tool control unit according to the length and axial position information of the workpiece gripped by the chuck. Workpiece discharging device of a machine tool, characterized in that for adjusting the length of the rotating shaft. According to claim 1, wherein the link rotates between a workpiece gripped by the chuck of the main shaft and the workpiece outlet as the rotating shaft rotates, and the length of the link is the length of the main shaft from a position coupled to the rotating shaft. A workpiece discharge device for a machine tool, characterized in that formed equal to or smaller than the distance to the axis. The method of claim 1, wherein the part catcher is rotatably coupled to the tip of the link by inserting a bearing, an electromagnet is installed in the longitudinal direction, and an outer circumferential direction is formed with a contact portion contacting the workpiece. Workpiece ejection device for machine tools. [6] The device of claim 5, wherein the contact portion has a polygonal shape to enlarge an area of contact with the workpiece. [6] The device of claim 5, wherein the contact portion has a concave shape to enlarge a contact area with the workpiece. The method of claim 5, wherein the electromagnet is supplied with power to form a magnetic field when a command to eject the workpiece gripped by the chuck is applied along with a signal from the control unit of the machine tool that processing of the workpiece is completed, thereby moving the workpiece, which is a magnetic body, to the contact portion. A workpiece discharge device for a machine tool, characterized in that attached to. 6. The work according to claim 5, wherein the contact part is covered with an elastic coating made of synthetic resin capable of absorbing shock in order to prevent damage to the machined surface of the workpiece due to impact when the workpiece is attached by magnetic force. The machine's workpiece ejection device. The device of claim 1, wherein the workpiece discharge port has an inlet protruding into the inside of the machine tool to guide the workpiece to the outside of the workpiece discharge port.