KR100727596B1 - Workpiece discharge device for a machine tool - Google Patents

Abstract

A workpiece discharge device for a machine tool is provided to unclamp a finished workpiece and move the workpiece to the outside of a chuck at the same time. A workpiece discharge device for a machine tool, includes a main body(10), a discharge unit, and an elastic unit. The main body is fixed in a main shaft(2) of the machine tool for rotating a chuck(3). The discharge unit is fitted into the main body such that the discharge unit reciprocates. The discharge unit has one end extended to the workpiece clamping point of the chuck out of one end of the main body. The elastic unit has both ends supported at the main body and the discharge unit, and makes the discharge unit return to the original position. The main body includes a sealing member which is coupled to an inner surface of a workpiece clamping point side end and contacts an outer surface of the discharge unit so as to prevent inflow of foreign substances.

Description

Workpiece ejector for machine tools {WORKPIECE DISCHARGE DEVICE FOR A MACHINE TOOL}

1 is a cross-sectional view of the workpiece discharge apparatus installed in accordance with the present invention.

Figure 2 is an exploded perspective view of the workpiece discharge device according to the present invention.

Figure 3a, 3b is a view illustrating a state in which the workpiece discharge device is driven according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: body

14: support

20: push bar

21: support ring

30: spring

The present invention relates to a workpiece discharging device for a machine tool. In detail, it implements a configuration in which the processed workpiece is automatically discharged from the chuck, contributing to the complete automation of the workpiece discharge process, and this configuration is implemented in a simpler configuration to reduce the manufacturing cost of the machine tool workpiece ejector It is about.

Machine tools are stationary power machines used to fabricate parts made of metal or other materials. Representative of such a machine tool is a lathe for processing shafts, pipes, etc. after clamping the workpiece to the chuck that is rotated by the main shaft, it is rotated to cut the desired shape with a cutting tool to complete the product.

In particular, since most of the factories that produce mechanical parts, etc., build an automation line, a numerical control (NC) method for automatically processing a product without depending on manpower has been steadily developed. As a result of this development, a CNC for processing a product by interlocking with a computer has been developed. In addition, a supply / discharge device for a numerical control lathe for automatically supplying / discharging a workpiece has been proposed.

A conventional work supply / discharge device is mainly configured by combining a supply holder and a discharge holder holding a work by a cylinder and a moving device for moving the supply holder and the discharge holder. In addition, the supply / discharge device is configured to install a pressing device for releasing the holding state of the workpiece and presses the workpiece into the chuck when the supply holder is located in the vicinity of the chuck of the shelf in conjunction with the moving device.

As described above, the supply / discharge device of this configuration is supplied with the workpiece by the supply holder and the moving device without any problem. On the other hand, in the process of discharging the finished workpiece, there is no means for moving the unclamped workpiece out of the chuck after the machining is completed, so that the workpiece is forcibly discharged by the discharge holder in a state in which the workpiece is not completely removed from the chuck.

At this time, the workpiece is a problem such that the workpiece collides with the jaws of the chuck due to the forced discharge of the discharge holder is generated, so that after the completion of the processing, the worker to perform a cumbersome work to move the workpiece from the inside of the chuck to the outside do.

Therefore, such a supply / discharge device cannot be considered to be fully automated, and in order to solve this problem, a push rod is installed through a main shaft and a cylinder for reciprocating the push rod behind the push rod is conventionally used. It has been proposed to configure the installed discharge device separately.

The conventional discharge device as described above requires a separate bearing configuration to separate the rotating portion, the non-rotating portion in order to prevent the cylinder which is supplied with a constant pressure fluid from the external compressor, etc. during rotation of the main shaft at the same time.

Due to this, the discharge device is very complicated and difficult to manufacture, and in particular, the manufacturing cost of the shelf itself is greatly increased by expensive cylinders and many parts.

In particular, in the discharge device of the complex configuration, if the center of the push rod and the spindle do not coincide, vibration is generated between the rotating part and the non-rotating part by the rotation of the main shaft, thereby lowering the machining precision, and using the main shaft by the continuous vibration. The problem is that the service life is also significantly lowered.

The present invention has been invented to solve the above problems, an object of the present invention is to provide an automatic discharge device of a simplified configuration so that the finished workpiece is moved to the outside of the chuck at the same time as the unclamped.

In order to achieve the above object, the present invention has the following configuration.

The present invention includes a body fixed inside the main shaft of the machine tool for rotating the chuck; A discharge means inserted into the inside of the body to be shuttle-reciprocated and having one end extending out of an end of the body to a workpiece clamping point of the chuck; Both ends are supported by the body and the discharge means, and comprises an elastic means for returning the discharge means moved back and forth shuttle.

By the above configuration, the present invention, while the finished workpiece is unclamped at the same time the elastic means to move the discharge means to work so that the workpiece is moved to the outside of the chuck.

Hereinafter, exemplary embodiments of the present invention to which the above configuration is applied will be described in detail with reference to the accompanying drawings.

1 is a cross-sectional view of a state in which a workpiece discharging device is installed according to the present invention, and FIG. 2 is an exploded perspective view of the workpiece discharging device according to the present invention. In this case, the machine tool for processing the workpiece illustrates a lathe, and the chuck for clamping the workpiece represents a collet chuck on the drawing.

Referring to the drawings, the workpiece discharging device according to the present invention between the body 10, the push bar 20 which is the discharge means inserted into the body 10, between the body 10 and the push bar 20 It is made of a spring (30) that is mounted on the elastic means.

The body 10 is fixedly installed in the main shaft 2 for rotating the chuck 3 of the shelf (1). The body 10 is formed of a hollow cylindrical body. In addition, the body 10 is formed so that the protrusion 11 of the inner diameter corresponding to the diameter of the push bar 20 protrudes from the inner circumferential surface in order for the push bar 20 to be linearly flowed when the push bar 20 is inserted into the shuttle. do. In particular, the body 10 has a coupling end portion 12 screwed with the collet 4 fixed to the inside of the chuck 3 in order to maintain a more rigid fixed state inside the main shaft (2) on the outer surface of the end Is formed. Therefore, it is natural that the thread shape is formed on the inner surface of the end of the collet 4 which is coupled to the coupling end 12.

In an additional configuration, the inner circumferential surface of the body 10 having the coupling end 12 is coupled to the oil seal 13 (oil-seal), which is a sealing means in which the inner surface is in contact with the outer circumferential surface of the push bar 20. The oil chamber 13 is configured to block foreign substances such as cutting oil supplied during processing of the workpiece and cutting chips generated during processing, from entering the outside of the body.

In addition, the body 10 supports the one end of the spring 30 is coupled to the support 14 at the end where the end of the spring 30 is located. Here, the support 14 has a through hole 15 through which the push bar 20 is formed. In particular, the inner diameter of the through hole 15 is at least smaller than the outer diameter of the spring 30 so that the end of the spring 30 can be supported, and corresponding to the outer diameter of the push bar 20 of the inner peripheral surface of the body 10 described above. Together with the protrusion 11 induces a stable linear movement of the push bar (20).

The push bar 20 is inserted into the shuttle reciprocating movement in the interior of the body 10 as described above. One end of the push bar 20 for pressing the work T extends out of the line of the end of the body 10 to the work clamping point of the chuck 3. In addition, the other end of the push bar 20 protrudes from the body 10 by passing through the through hole 15 of the support body 14 of the body 10. The push bar 20 is coupled to the support ring 21 is fitted to the outer surface of the point where the end (opposite end of the end supported by the body) of the spring 30 is located.

The support ring 21 is in the form of a bushing having a diameter larger than the diameter of the push bar 20, and performs a stopper function at one end of the spring 30. In addition, in order to fix the position of the support ring 21, the push bar 20 is stepped on one side of an outer surface thereof so that one side of the support ring 21 is in contact with each other, and a snap ring is formed at an interval corresponding to the width of the support ring 21. 22 is coupled to contact the other side of the support ring (21). Here, the coupling groove 23 is formed on the outer circumferential surface of the push bar 20 to be coupled to the snap ring 22 is well known. In addition, the support ring 21 may be integrally formed with the push bar 20.

In addition, the push bar 20 is a tool coupling portion 24 is coupled to a tool for pulling out the device from the spindle 2 or forcibly moving the push bar 20 to the end protruding through the support ring 21 Is formed. The tool coupling portion 24 is formed by forming a flat portion 25 in a predetermined section of the end of the push bar (20).

The spring 30 is applied to the compression coil spring is inserted into the interior of the body 10 and fitted to the outer surface of the push bar 20, one end is the support bar 14 of the body 10, the other end is push bar ( The configuration supported by the support ring 21 of 20) is as described above. Such a spring 30 may be applied to a configuration such as a torsion spring, a leaf spring, such as a synthetic resin elastomer or a spring with excellent elasticity.

Figure 3a, Figure 3b is an exemplary view showing a state in which the workpiece discharge device according to the present invention is driven.

In the figure, reference numeral 40 denotes a supply / discharge apparatus, 41 and 42 are supply and discharge holders holding the workpiece T, 43 a moving device for moving the holders 41 and 42, and 44 a workpiece T. Cutting tools, such as a bite, are shown, which omits the above description in a well-known configuration.

Referring to the drawing, when the supply holder 41 holds the workpiece T, the supply holder 41 is moved by the moving device 43 so that the workpiece T is moved near the chuck 3. In this state, when the supply holder 41 is driven to move the work T inside the chuck 3, the chuck 3 clamps the work T, and then the supply holder 41 returns to its original position. do.

At this time, the push bar 20 of the discharge device as shown in Figure 3a is pushed by the workpiece (T) is to linearly move to the inside of the body (10). Due to this, the spring 30 is pressed by the support ring 21 of the push bar 20 as shown in the drawing, the support 14 of the body 10 and the support ring 21 of the push bar 20. The elastic force is maintained in between.

Thereafter, the main shaft 2 is rotated so that the work T is rotated, and in this state, the cutting tool 44 moves to the work T side to perform a desired machining operation.

When the machining operation is completed, the rotation of the spindle 2 is stopped and at the same time the cutting tool 44 is returned to its original position and the chuck 3 unclamps the workpiece T (meaning to release the clamping state). .

At this time, the push bar 20 presses the work T to the outside of the chuck 3 as shown in the circle view of FIG. 3b. This is the action generated by moving the push bar 20 to its original position by restoring the spring 30, the elastic force is embedded between the support 14 of the body 10 and the support ring 21 of the push bar 20 to be.

Thereafter, the discharge holder 42 holds the work T and is moved by the moving device 43 to discharge the finished work to the outside of the device.

As described above, in the present invention, the finished workpiece is unclamped in the chuck and simultaneously moved to the holder side to be stably discharged, thereby realizing a fully automatic discharge process.

In particular, the present invention is to simplify the configuration for automatically moving the work piece to greatly reduce the productivity and manufacturing cost by easy manufacturing. In addition, according to the present invention, the vibration is generated by the division of the rotating part and the non-rotating part by the configuration that is simultaneously rotated with the main shaft, thereby not affecting the processing accuracy, and eliminating the load factor of the main shaft caused by the vibration, thereby shortening the service life of the main shaft. You will get the effect of preventing.

Claims (7)

delete A body fixed inside the main shaft of the machine tool for rotating the chuck; A discharge means inserted into the inside of the body to be shuttle-reciprocated and having one end extending out of an end of the body to a workpiece clamping point of the chuck; Both ends are supported by the body and the discharge means, the machine tool workpiece discharge device including an elastic means for returning the discharge means moved back and forth shuttles, The body is coupled to the inner circumferential surface of the end portion of the workpiece clamping point and the machine tool workpiece ejection apparatus comprising a sealing means for contacting the outer surface of the discharge means to block the inflow of foreign matter. A body fixed inside the main shaft of the machine tool for rotating the chuck; A discharge means inserted into the inside of the body to be shuttle-reciprocated and having one end extending out of an end of the body to a workpiece clamping point of the chuck; Both ends are supported by the body and the discharge means, the machine tool workpiece discharge device including an elastic means for returning the discharge means moved back and forth shuttles, The body is coupled to the point of the body where the end of the elastic means is coupled to the workpiece discharging device for a machine tool characterized in that it further comprises a support for supporting the elastic means. A body fixed inside the main shaft of the machine tool for rotating the chuck; A discharge means inserted into the inside of the body to be shuttle-reciprocated and having one end extending out of an end of the body to a workpiece clamping point of the chuck; Both ends are supported by the body and the discharge means, the machine tool workpiece discharge device including an elastic means for returning the discharge means moved back and forth shuttles, The discharging means is coupled to the outer surface of the point where the end of the elastic means is coupled to the workpiece discharging device for a machine tool, characterized in that it comprises a support ring for supporting the elastic means. A body fixed inside the main shaft of the machine tool for rotating the chuck; A discharge means inserted into the inside of the body to be shuttle-reciprocated and having one end extending out of an end of the body to a workpiece clamping point of the chuck; Both ends are supported by the body and the discharge means, the machine tool workpiece discharge device including an elastic means for returning the discharge means moved back and forth shuttles, The discharging means is projected out of the opposite side end of the workpiece clamp point side end of the body, the workpiece discharging device for a machine tool, characterized in that a tool coupling portion is formed so that the tool can be coupled to the protruding point. The method according to claim 3 or 4, The elastic means is a workpiece discharge device for a machine tool, characterized in that the compression coil spring is inserted into the body and fitted to the outer surface of the discharge means. A body fixed inside the main shaft of the machine tool for rotating the chuck; A discharge means inserted into the inside of the body to be shuttle-reciprocated and having one end extending out of an end of the body to a workpiece clamping point of the chuck; Both ends are supported by the body and the discharge means, the machine tool workpiece discharge device including an elastic means for returning the discharge means moved back and forth shuttles, The chuck is composed of a collet chuck, the workpiece discharging device for a machine tool, characterized in that the coupling end portion formed in the form of a screw on the outer surface of the end of the body to couple the opposite end of the body and the collet.

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