KR102649100B1 - Apparatus for Checking Curvic Coupling Clamp of Tool Holder for Machine Tools - Google Patents

Abstract

The present invention relates to a device for checking whether a tool bar and a curvic coupling for a machine tool are engaged. In particular, the device for machine tools resolves quality complaints and reduces assembly man-hours by enabling easy and reliable confirmation of the clamping and unclamping operations of the curvic coupling. This relates to a device for checking whether the tool post curvic coupling is coupled. The configuration is a device for checking whether the tool rest curvic coupling for a machine tool is engaged, and is formed in one or two pieces at a distance of 3 to 4 mm from the rear end of the dog shaft formed inside the tool rest, and is connected to the center of the rear end of the dog shaft. A sensor that is formed to be parallel or deviated to detect the rear end surface of the dog shaft; A bracket formed between the dog shaft and the sensor and having a tapped hole on one side to allow adjustment of the gap with the dog shaft when assembling the sensor; It is characterized by comprising:

Description

Apparatus for Checking Curvic Coupling Clamp of Tool Holder for Machine Tools}

The present invention relates to a device for checking whether a tool bar and a curvic coupling for a machine tool are engaged. In particular, the device for machine tools resolves quality complaints and reduces assembly man-hours by enabling easy and reliable confirmation of the clamping and unclamping operations of the curvic coupling. This relates to a device for checking whether the tool post curvic coupling is coupled.

In general, various types of machine tools are widely used to suit the purpose of the work, including turning centers, machining centers, door-type machining centers, Swiss turns, electric discharge machines, and horizontal NC boring machines.

In addition, lathes, which are machine tools that perform cutting processing, are widely used using numerical control. These lathes have axes linked by the high-speed rotation of the spindle motor and a chucking device to clamp the workpiece to the axes. A spindle unit having a spindle unit, a tailstock positioned on the same center line as the drive shaft of the spindle unit to support the center of the other side of the workpiece to prevent it from being off-center due to centrifugal force caused by high-speed rotation of the workpiece, and a tailstock located on a bed at the top of the spindle unit. It is roughly divided into tool racks equipped with a turret that can access the workpiece by means of a ball screw unit that is installed and moves horizontally and vertically and perform various workpiece machining operations according to the machining sequence.

As shown in FIG. 1, the lathe tool stand 300 of this machine tool includes a drive motor 310 that generates a driving force, a rotary curb 321 connected to the drive motor 310, and a rotary curvic 321. A curvic coupling 320 including a fixed curb 322 that controls the rotation of the rotary curb 321 and a piston curb 323 connected to the fixed curb 322, and is supported on the piston curb 323. It includes a dog shaft 330 that operates forward and backward.

In the conventional tool rest 300 for machine tools configured in this way, the driving force of the drive motor 310 is transmitted to generate movement of the rotating curvature 321 and the turret disk (not shown) to exchange tools (not shown). .

Here, the operating structure of the curvic coupling 320 is such that the hydraulic pressure flowing in through the hydraulic pipe (not shown) in the body of the tool post 300 presses both sides of the piston curvic 323, causing the piston curvic 323 to move forward and backward. It has a structure in which the rotating curb 321 and the fixed curb 322 are restrained (clamped) or released (unclamped) by moving forward.

That is, the curvic coupling 320 is installed in such a way that acid and acid are combined or separated through operating hydraulic pressure.

And, conventionally, in order to check whether the curvic coupling 320 is coupled or separated, a bracket 110 and a spring 130 installed on one end of the dog shaft 330 and a spring 130 installed through the bracket 110 are used. A device for checking whether a tool stem coupling for a machine tool is engaged (100) is known, which consists of a plurality of proximity sensors (120).

The device for checking whether the tool post coupling for a machine tool 100 has this configuration has a dog shaft 330 inserted through the inside of the body of the tool post 300, which is elastically supported on one end of the piston curb 323. Therefore, when the piston curb 323 moves forward, it moves forward in conjunction with it, and when the piston curb 323 retracts, the dog shaft 330 retreats due to the tension force of the spring 130 at the rear end.

At this time, the proximity sensor 120 of the curvic coupling engagement confirmation device 100 installed at the end of the dog shaft 330 through a separate bracket 110 detects the forward and backward cylindrical surfaces of the dog shaft 330. This checks whether the curvic coupling 320 is clamped or unclamped, that is, whether it is coupled.

However, the conventional machine tool tool coupling coupling confirmation device 100 has a proximity sensor 120 installed through a separate bracket 110 on one end of the dog shaft 330, and the proximity sensor 120 is installed on the cylinder of the dog shaft 330. Because the surface is sensed, there is a problem in that sensing is not possible due to vibration during processing of the workpiece or the direction of the proximity sensor 120 frequently changing depending on the skill level of the assembler.

In addition, conventionally, it is difficult to adjust the gap between the proximity sensor 120 and the cylindrical surface of the dog shaft 330, and the distance with the cylindrical surface of the dog shaft 330 is not constant, so it is difficult to accurately determine the sensing position, making it difficult to assemble. There was a problem that it took a lot of time.

In addition, an assembly jig is used to accurately determine the sensing position of the proximity sensor 120, but there is a problem in that the assembly jig is severely deformed and must be replaced periodically.

In addition, in the related art, since the dog shaft 330 was coupled to support the piston curb 323, there was a problem in that disassembly and assembly of the dog shaft 323 were difficult and took a long time.

In addition, conventionally, the dog shaft 330 is assembled to the piston curb 323 and installed in a way that moves forward and backward as one piece, and a bracket 110 is attached to one end of the dog shaft 330 using a limit switch (not shown). ) is fastened with a bolt and the switch is turned on/off by pressing the bolt head, so there is a problem in that a lot of parts are used.

Publication number 10-2018-0036478 Publication number 10-2018-0047062

Accordingly, the present invention was created to solve the above problems, and the purpose of the present invention is to improve the sensing structure to reduce frequently occurring quality defects, minimize the assembly time required when assembling the sensor, and improve convenience. It provides a device to check whether the tool stem coupling for a machine is engaged.

In order to achieve the above object, the present invention provides a device for checking whether a tool post curvic coupling for a machine tool is engaged, which is formed in one or two pieces at a distance of 3 to 4 mm from the rear end of the dog shaft formed inside the tool post. A sensor that is formed to be parallel to the center of the rear end of the dog shaft or deviated from it to detect the rear end surface of the dog shaft; A bracket formed between the dog shaft and the sensor and having a tapped hole on one side to allow adjustment of the gap with the dog shaft when assembling the sensor; It is characterized by comprising:

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In addition, the present invention can further provide a machine tool equipped with a device for checking whether the tool stem curvic coupling is engaged.

As described above, the present invention has the effect of preventing detection defects in the sensor and eliminating quality defects by allowing the distance between the dog shaft and the sensor to be adjusted to easily, smoothly, and accurately achieve the sensor's sensing distance.

In addition, the present invention improves assembly through standardization of dimensions when installing sensors, allows accurate installation regardless of the skill level of the assembler, and improves workability because a fixture for sensor installation is unnecessary.

In addition, since the present invention uses only one sensor, it has the effect of reducing costs and shortening tool exchange time and repair work time.

Figure 1 is a diagram schematically showing a conventional device for checking whether a tool stem curvic coupling for a machine tool is coupled.
Figure 2 is an exploded view of a device for checking whether the tool stem curvic coupling for a machine tool is coupled according to a preferred embodiment of the present invention.
Figure 3 is an assembly diagram of Figure 2.
Figure 4 is a diagram schematically showing the state in which the dog shaft coupled with the device for checking whether the tool post curvic coupling is engaged according to the present invention supports one side of the piston curvic.
Figure 5 is a diagram showing a rotating curve and a fixed curve formed on one side of the piston curve of Figure 4.
Figure 6 is a cross-sectional view of the main part of Figure 5.
Figure 7 is a diagram schematically showing the cross-sectional state of the main part of the device for checking whether the tool stem curvic coupling for a machine tool is coupled according to the present invention.
Figure 8 is another embodiment of the dog shaft according to the present invention, showing a state in which a separate circular plate is coupled to one end of the dog shaft.
Figure 9 is a diagram schematically showing the state in which the free space at the back is minimized by assembling the sensor according to the present invention toward the front rather than the back of the circular plate.
Figure 10 is a view showing the positions of a plurality of sensors according to the present invention in front and behind a circular plate, and at the same time, the plurality of sensors are not parallel to the center of the dog shaft but are symmetrical to each other.
Figure 11 is a diagram schematically showing the tool rest of a machine tool on which the curvic coupling coupling confirmation device according to the present invention is assembled.
Figure 12 is a diagram schematically showing the hydraulic force flow in the first hydraulic pipe and the second hydraulic pipe formed inside the body of the machine tool tool rest for the coupling and separation operation of the curvic coupling according to the present invention.
Figure 13 is a diagram schematically showing the operating state of the curvic coupling and the dog shaft according to the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in more detail based on the attached drawings.

Here, in all the drawings below, components having the same function are given the same reference numerals and repeated descriptions are omitted, and the terms described below are defined in consideration of the functions in the present invention, which has their own common meaning. It is specified that it should be interpreted as.

As shown in FIGS. 2 to 10, the device 200 for checking whether the tool post curvic coupling for a machine tool according to the present invention is coupled is divided into a sensor 210 and a bracket 220.

First, the tool rest 300 for a machine tool according to the present invention includes a body 300a, a drive motor 310 that generates driving force, and a rotary curvature 321 connected to the rotational motion of the drive motor 310. , a fixed curb 322 that regulates the rotation of the rotary curb 321, a curvic coupling 320 consisting of a piston curb 323 connected to the rotary curb 321 and the fixed curb 322, and the piston. It includes a dog shaft 330 that is supported on one side of the curb 323 and installed to move forward and backward.

In addition, the device for checking whether the tool post curvic coupling is engaged (200) according to the present invention is installed at the rear end of the dog shaft (330).

The sensor 210 is formed at a distance from the rear end of the dog shaft 330 formed inside the body 300a of the tool rest 300 and detects forward and backward motion of the dog shaft 330.

Also, it is preferable that the gap between the sensor 210 and the rear end of the dog shaft 330 is 3 to 4 mm.

That is, when the gap between the sensor 210 and the rear end of the dog shaft 330 is formed (set) to 3 mm or less, before the curvic coupling 320 is coupled by the sensing area of the sensor 210. The sensor 210 may first detect the rear end of the dog shaft 330, causing an operation problem of the tool post 300.

In addition, when the gap between the sensor 210 and the rear end of the dog shaft 330 is formed (set) to 4 mm or more, the sensing area of the sensor 210 may be exceeded or the rear end of the dog shaft 330 may vibrate during processing. , vibration and assembly errors may cause malfunction of the sensor 210, causing operational problems of the tool post 300.

Therefore, in the present invention, forming a gap between the sensor 210 and the rear end of the dog shaft 330 at 3 to 4 mm can best improve the reaction speed for checking whether the curvature coupling 320 is coupled.

In addition, it is preferable that one sensor 210 is formed at a distance from the rear end of the dog shaft 330.

However, the sensor 210 is not limited to this and two sensors 210 may be formed as needed.

For example, as shown in FIGS. 2 to 7, when the sensor 210 is formed as one, it is formed to be parallel to the center of the rear end of the dog shaft 330, or as shown in FIGS. 8 and 9, the sensor 210 is formed as a single sensor. (210) may be formed to be deviated from the center of the rear end of the dog shaft (330).

And, if necessary, the sensors 210 may be formed in two as shown in FIG. 10. In this case, they are formed to be symmetrical on both sides with respect to the center of the dog shaft 330 to improve sensing precision. It can be improved.

In addition, the sensor 210 may be placed before or after the detection plate 240 coupled to the dog shaft 330, which will be described later.

In this case, the sensor 210 can detect when the detection plate 240 assembled on the dog shaft 330 moves forward and backward.

In this way, in the case where two sensors 210 are formed, the present invention can prevent sensing defects even if one sensor 210 is broken or damaged.

The bracket 220 is formed between the dog shaft 330 and the sensor 210 so that the sensor 210 can accurately detect the forward and backward motion of the dog shaft 330.

That is, the bracket 220 is preferably formed in a U-shape so that the sensor 210 can accurately detect the forward and backward motion of the dog shaft 330.

And, assembly holes 221 and 222 for assembly are formed on the U-shaped front and rear sides of the bracket 220.

The assembly hole 221 matches the center position between the sensor 210 and the dog shaft 330, and a tab is formed on the inner surface of the assembly hole 222 to facilitate the assembly of the sensor 210 with the dog shaft. The distance from (330) can be adjusted.

That is, the assembly hole 221 guides the dog shaft 330 for assembling the sensor 210 formed on the bracket 220 to move forward and backward so that it is aligned with the center of the assembly hole 222 and the dog shaft 330. The positions are matched, and the distance between the assembly holes 222 can be adjusted by advancing or reversing the position of the sensor 210 through a tab (not shown) formed on the inner surface.

In addition, the bracket 220 serves to prevent the dog shaft 330 and the spring 230 installed at the rear end of the dog shaft 330 from being separated.

The bracket 220 according to the present invention of this configuration makes it easy to adjust the gap between the sensor 210 and the dog shaft 330 when assembling the sensor 210, so that after the sensor 210 and the dog shaft 330 Since the distance from the end is constant, the sensing position value can be accurately determined, thereby minimizing assembly time.

In addition, by assembling the sensor 210 and the dog shaft 330 through the assembly holes 221 and 222, there is no need to use a separate fixture, thereby reducing costs and reducing maintenance work. It can be prevented.

For example, by forming a male screw (not shown) on the outer peripheral surface of one end of the sensor 210 and engaging it with a tab (not shown) formed on the inner surface of the assembly hole 222 of the bracket 220, the assembly operation is performed. In addition, the distance between the sensor 210 and the dog shaft 330 can be adjusted consistently and easily.

Meanwhile, in the present invention, it is preferable that the rear end surface of the dog shaft 330 is formed integrally with a circular shape, or that the detection plate 240 made of a separate circular plate can be formed in combination.

That is, the rear end surface of the dog shaft 330, which is installed so that the sensor 210 can accurately detect the movement of the dog shaft 330 moving forward and backward, has a circular shape corresponding to the circumferential surface of the sensor 210. It is preferable that this is formed as one piece.

In addition, so that the sensor 210 can detect the movement of the dog shaft 330 forward and backward more reliably and accurately, the rear cross-section of the dog shaft 330 is as shown in FIGS. 8 to 10. Similarly, a detection plate 240 made of a circular plate whose size is larger than the rear end circumference of the dog shaft 330 can be added.

Here, the detection plate 240 is preferably fastened to form a concentric circle at the center of the rear end surface of the dog shaft 330 using a fastener 241 such as a bolt or screw.

In addition, the dog shaft 330 is elastically supported by having a front end surface in contact with one side of the piston curvik 323 constituting the curvic coupling 320.

Additionally, a spring 230 is installed at the rear end of the dog shaft 330 to be elastically supported by a bracket 220.

Here, it is preferable that one side of the dog shaft 330 moves forward and backward by hydraulic force and the other side by the spring force of the spring 230.

For example, when operating hydraulic force is generated to one side, the piston curb 323 moves to one side and pushes the dog shaft 330 to one side, causing the dog shaft 330 to move.

At this time, when the dog shaft 330 moves to one side, the lamp (not shown) of the sensor 210 turns on to confirm the coupling of the curvic coupling 320.

Conversely, when the operating hydraulic force acts in the opposite direction, the piston curb 323 moves toward the tile side and moves the dog shaft 330 to the other side by the elastic return force of the spring 230 installed at the rear end of the dog shaft 330. When pushed, the dog shaft 330 moves.

At this time, when the dog shaft 330 moves to one side, the distance from the sensor 210 increases and the lamp of the sensor 210 turns off, allowing the separation of the curvic coupling 320 to be confirmed.

That is, the operating structure of the curvic coupling 320 is such that the hydraulic force flowing in through the first and second hydraulic pipes 340 and 350 formed inside the body 330a of the tool post 300 is piston curvic ( It has a structure in which the rotating curb 321 and the fixed curb 322 are restrained (clamped) or released (unclamped) by pressing both sides of the piston curb 323 to move it forward and backward.

In addition, the present invention can further provide a machine tool (not shown) equipped with a device 200 for checking whether the tool post curvic coupling is engaged.

The operating state of the present invention configured as above will be described with reference to FIGS. 11 and 13 as follows.

First, when it is desired to check whether the curvic coupling 320 of the tool post 300 of a machine tool (not shown) equipped with the curvic coupling coupling confirmation device 200 according to the present invention is clamped or unclamped, As shown in Figure 12, hydraulic pressure is input through the first hydraulic pipe 340 formed inside the body 300a of the tool rest 300.

As a result, the hydraulic force supplied through the first hydraulic pipe 340 advances the piston curb 323 to one side, and in conjunction with this, the dog shaft 330 elastically supports one side of the piston curb 323. Push and advance to one side.

And, when the dog shaft 330 moves forward, the distance between the sensor 210 and the dog shaft 330 becomes closer, and the sensor 210 detects this and turns on the lamp.

At this time, the rotating curvic 321 and the fixed curvic 322 of the curvic coupling 320 are coupled to each other to form a state in which a tool (not shown) is clamped (coupled).

Conversely, when hydraulic pressure is input through the second hydraulic pipe 350 formed inside the body 300a of the tool rest 300, the hydraulic force supplied through the second hydraulic pipe 350 is applied to the piston curvature 323. is moved backwards to one side.

In conjunction with this, the dog shaft 330, which elastically supports one side of the piston curb 323 by the elastic force of the spring 230, moves backward to one side by the elastic return force of the spring 230.

And, when the dog shaft 330 moves backwards, the distance between the sensor 210 and the dog shaft 330 increases, and the lamp of the sensor 210 turns off.

At this time, the rotating curvic 321 and the fixed curvic 322 of the curvic coupling 320 are separated from each other to form a state in which the tool is unclamped (separated).

In this way, the dog shaft 330 is aligned with the piston curb 323 and moves in one direction by hydraulic force, and the tile side moves by the force of the spring 230.

Therefore, the present invention can improve the assembly structure of the sensor to prevent detection failures, eliminate quality defects, and improve assemblyability.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes to other equivalent embodiments are possible without departing from the technical spirit of the present invention. It will be clear to those skilled in the art to which the present invention pertains.

200: Device for checking whether Curvik coupling is coupled 210: Sensor
220: bracket 221, 222: assembly hole
223: fastener 230: spring
240: detection plate 241: fastener
300: Tool post 300a: Body
310: Motor 320: Curvik Coupling
321: Rotating curb 322: Fixed curb
323: Piston Curvik 330: Dog Shaft
340: first hydraulic pipe 350: second hydraulic pipe

Claims (10)

In the device for checking whether the tool post curvic coupling for machine tools is coupled,
It is formed in one or two pieces at a distance of 3 to 4 mm from the rear end of the dog shaft formed inside the tool rest and is formed to be parallel to the center of the rear end of the dog shaft, or is formed to be deviated to form a rear end surface of the dog shaft. A sensor that detects;
A bracket formed between the dog shaft and the sensor and having a tapped hole on one side to allow adjustment of the gap with the dog shaft when assembling the sensor; A device for checking whether the tool post curvic coupling for a machine tool is coupled, characterized in that it includes. delete delete delete delete delete delete delete delete A machine tool equipped with a device for checking whether the tool stem curvic coupling described in paragraph 1 is engaged.