KR20240042841A - Apparatus for detecting tight contact state of tool holder - Google Patents

Abstract

The present invention relates to a device for checking the adhesion status of a tool holder of a machine tool, and includes an elastic deformable body (200) that is elastically deformed by high-pressure air to maintain airtightness, and an air sensor (400) that detects air leakage of the end surface contact portion (11). By using , it is possible to detect air leakage of the end-face contact part 11 where the tool holder 10 and the spindle 20 are in contact, and through this, to check the adhesion state of the end-face contact part 11 of the tool holder 10. .

Description

Device for checking tool holder adhesion status of machine tool {APPARATUS FOR DETECTING TIGHT CONTACT STATE OF TOOL HOLDER}

The present invention relates to a device for checking the adhesion state of a tool holder of a machine tool. More specifically, a device for checking the adhesion state of the end-face contact part in a structure where the tool holder and the spindle are in double contact at the end-face contact part and the tapered contact part. This is a technology related to a device for checking the holder adhesion status.

In general, machines that process metal or non-metallic materials using cutting or non-cutting methods using appropriate tools are called machine tools. Machine tools include commonly known lathes, milling machines, grinders, drill machines, tapping machines, boring machines, etc. In addition to general-purpose machine tools, there are NC (Numerical Control) machine tools, CNC (Computer Numerical Control) machine tools, and machining center tools.

In addition, machine tools that perform machining while automatically exchanging tools between a tool magazine and a spindle are widely used.

In these machine tools, cutting chips or foreign substances generated during machining sometimes attach to the contact surface of the tool holder and the spindle on the main axis.

In this way, if chips or foreign matter, etc., become stuck on the contact surface between the tool holder and the spindle, the workpiece is processed without the tool holder being completely adhered to the spindle, and as a result, the position of the tool performing the machining is not positioned accurately. This has the disadvantage of deteriorating processing quality and, in some cases, damaging the tool or spindle.

In order to prevent the above-described shortcomings, a gap sensor was conventionally installed on the main axis to detect the close contact between the tool holder and the spindle. However, the gap sensor has the disadvantage of being expensive and particularly difficult to install, requiring skill.

The matters described as background technology above are only for the purpose of improving understanding of the background of the present invention, and should not be taken as acknowledgment that they correspond to prior art already known to those skilled in the art.

Republic of Korea Patent Publication 10-2010-0116228

The present invention is a tool holder adhesion checking device for a machine tool that can check the adhesion state of the end-face contact part in a structure where the tool holder and the spindle are in double contact at the end-face contact part and the tapered contact part. It is elastically deformed by high-pressure air and is airtight. It is composed of an elastic deformable body that acts as a seal to maintain the gap sensor, and its purpose is to make it easier to use by being cheaper and easier to install than a conventional gap sensor.

The present invention to achieve the above object is a device for checking the adhesion state of the tool holder of a machine tool, which can check the adhesion state of the end-face contact part in a structure where the tool holder and the spindle are in double contact at the end-face contact part and the tapered contact part, an air passage formed through the spindle and connected to the cross-sectional contact portion; An elastic deformable body that is installed on the spindle and is elastically deformed by the supplied air, and is in close contact with the spindle surface during elastic deformation to maintain airtightness; An air supply device that supplies high-pressure air to the elastic deformable body; And an air sensor that detects the amount of leakage of the end-face contact portion by spraying air at a certain pressure into the air passage while the elastic deformable body is in close contact with the spindle surface and maintains airtightness.

A solenoid valve is installed on the airline between the elastic deformable body and the air supply device and controls air supply to the elastic deformable body depending on whether the spindle rotates.

The solenoid valve is turned off when the spindle rotates and turned on when the spindle stops. When the solenoid valve is turned off, air supply to the elastic deformable body is stopped, and when the solenoid valve is turned on, air is supplied to the elastic deformable body.

The air sensor operates when the spindle stops and sprays air at a certain pressure into the air passage to detect the amount of leakage from the end-face contact part.

The elastic deformable body is formed in a circular ring shape and is installed to be inserted into the outer peripheral surface of the spindle.

The elastic deformable body includes a main body in which an air hole is formed and the external shape remains unchanged due to air; and an elastic part connected to the main body and elastically deformed by air and in close contact with the spindle surface to maintain airtightness.

The main body is formed with a T-shaped cross section; The elastic portion is coupled to both sides of the main body and is characterized in that it is formed of either an open elastic lip that is coupled to open both sides of the main body or a closed elastic lip that forms a closed space with both sides of the main body.

The air hole includes a first air hole and a second air hole formed at opposite positions along the circumferential direction of the elastic deformable body; The first air hole is not connected to the air passage of the spindle, but only the second air hole is connected to the air passage.

The first air hole penetrates the outer peripheral surface of the main body, is connected to the airline of the solenoid valve, and is characterized by penetrating both sides of the main body and opening toward the elastic portion.

The second air hole is characterized by penetrating the outer and inner circumferential surfaces of the main body and being connected to the air passage.

The embodiment according to the present invention is a device that can check the adhesion state of the end-face contact part in a structure where the tool holder and the spindle are in double contact at the end-face contact part and the tapered contact part. The elastic device maintains airtightness by being elastically deformed by high-pressure air. It is a configuration that utilizes an air sensor that detects air leakage from the deformable body and end-face contact area. Compared to a structure that uses a conventional gap sensor to check the adhesion state of the tool holder, it is cheaper and can be installed easily, making it easy to use. There is an effect.

1 is a diagram of a machine tool spindle equipped with a tool holder adhesion status confirmation device according to the present invention;
Figure 2 is a view with the housing removed from Figure 1;
Figures 3 and 4 are enlarged views of parts A and B of Figure 2;
Figure 5 is a view of an elastic deformable body with open elastic grains according to the present invention;
6 to 7 are diagrams of an elastic deformable body with closed elastic grains according to the present invention.

Hereinafter, embodiments disclosed in the present specification will be described in detail with reference to the attached drawings. However, identical or similar components will be assigned the same reference numbers regardless of reference numerals, and duplicate descriptions thereof will be omitted.

The suffixes “module” and “part” for components used in the following description are given or used interchangeably only for the ease of preparing the specification, and do not have distinct meanings or roles in themselves.

In describing the embodiments disclosed in this specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in this specification, the detailed descriptions will be omitted.

In addition, the attached drawings are only for easy understanding of the embodiments disclosed in this specification, and the technical idea disclosed in this specification is not limited by the attached drawings, and all changes included in the spirit and technical scope of the present invention are not limited. , should be understood to include equivalents or substitutes.

Terms containing ordinal numbers, such as first, second, etc., may be used to describe various components, but the components are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be.

On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

Singular expressions include plural expressions unless the context clearly dictates otherwise.

In this specification, terms such as “comprise” or “have” are intended to indicate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

In addition, the unit or control unit included in names such as motor control unit (MCU) and hybrid control unit (HCU) is a control device that controls specific vehicle functions. It is only a term widely used in naming, and does not mean a generic function unit.

A controller is a communication device that communicates with other controllers or sensors to control the function it is in charge of, a memory that stores the operating system, logic commands, input/output information, etc., and a device that performs the judgments, calculations, and decisions necessary to control the function it is in charge of. It may include more than one processor.

Hereinafter, with reference to the attached drawings, we will look at a device for checking the adhesion state of a tool holder of a machine tool according to a preferred embodiment of the present invention.

An embodiment according to the present invention will be described with reference to FIGS. 1 to 7.

As shown, the main axis 1 of a machine tool is a part that functions to process the workpiece by fixing the tool and then rotating it to process the workpiece.

The main shaft 1 largely includes a clamping part that clamps the tool, a rotating part that rotates the tool, and a fixing part that supports the clamping part and the rotating part.

The clamping part of the main axis (1) includes a tool holder (10), a drawbar assembly, and a tool unclamping cylinder.

The tool holder 10 is a part on which tools for processing a workpiece are installed and is installed in close contact with the spindle 20, which will be described later. In the embodiment according to the present invention, the tool holder 10 and the spindle 20 have a cross-sectional contact portion ( 11) and the tapered contact portion 12 are installed in a double contact structure.

The drawbar assembly is a combination of a collet and a spring and is a part that fixes the tool holder (10) with spring force, and the tool unclamp cylinder compresses the spring of the drawbar assembly to secure the tool holder (10) from the spindle (20). It serves to separate.

The rotating part of the main shaft 1 includes a spindle 20, a bearing 30, a coupling, and a motor.

The spindle 20 is a rotating object that includes the above-described clamping part and fixes the tool, and the bearing 30 is a component that connects the spindle 20, which is a rotating body, and the housing 40, which will be described later, and the spindle support body, which are fixed bodies. am.

The coupling is a part that connects the spindle 20 and the motor, and the motor is a part that operates with electric power to rotate the spindle 20.

The fixing part of the main shaft (1) includes a head body, housing (40), and covers.

The head body is a body that supports the cartridge of the spindle 20 and is fixed to the column, the housing 40 is a fixed body that supports the rotation of the spindle 20 using the bearing 30 as an intermediate medium, and the covers are being processed. This is a part to prevent foreign substances such as chips from entering.

The fixed part of the main shaft (1) is a fixed body that does not rotate, and serves as a path for bearing cooling grooves, lubricating oil, and air and coolant necessary for processing.

The device for checking the tool holder adhesion status of a machine tool according to the present invention has a structure in which the tool holder (10) and the spindle (20) are in double contact at the end surface contact part (11) and the tapered contact part (12). A device capable of checking the adhesion state, comprising: an air passage 100 formed through the spindle 20 and connected to the cross-sectional contact portion 11; An elastic deformable body 200 that is installed on the spindle 20 and is elastically deformed by the supplied air, and is in close contact with the surface of the spindle 20 during elastic deformation to maintain airtightness; An air supply device (300) that supplies high-pressure air to the elastic deformable body (200); And an air sensor 400 that detects the amount of leakage of the end-face contact portion 11 by spraying air at a certain pressure into the air passage 100 while the elastic deformable body 200 is in close contact with the surface of the spindle 20 and maintains airtightness. Includes ;

One end of the air passage 100 penetrates the outer peripheral surface of the spindle 20, and the other end penetrates the cross-sectional contact portion 11 where the tool holder 10 and the spindle 20 contact.

The elastic deformable body 200 is installed to be inserted into the outer peripheral surface of the spindle 20 at a position where one end of the air passage 100 is located.

The air supplier 300 is for supplying high-pressure air to the elastic deformable body 200 and includes an air tank and an air pump.

The air supplier 300 and the elastic deformable body 200 are connected through an airline 500.

An embodiment according to the present invention is a solenoid valve installed in the airline 500 between the elastic deformable body 200 and the air supply 300 to control air supply to the elastic deformable body 200 depending on whether the spindle 20 rotates. It further includes (600).

The solenoid valve 600 is turned off when the spindle 20 rotates and turned on when the spindle 20 is stopped. When the solenoid valve 600 is turned off, the air supply to the elastic deformable body 200 is stopped. , air is supplied to the elastic deformable body 200 when the solenoid valve 600 is turned on.

The air sensor 400 operates when the spindle 20 stops and sprays air at a certain pressure into the air passage 100 to detect the amount of leakage in the end-face contact part 11. The control unit (ECU) operates as an air sensor. Using the detection signal of (400), it is determined whether the end-side contact part (11) is leaking.

The air sensor 400 is configured to supply air at a certain pressure to the air passage 100, and has a function to detect the air pressure supplied to the air passage 100 at the same time.

If the air pressure supplied to the air passage 100 and the air pressure detected by the air sensor 400 are within the standard range, the control unit determines that it is in a normal state with no air leakage from the end-face contact part 11, and determines that the air passage (100) is in a normal state with no air leakage. If the air pressure detected by the air sensor 400 is lower than the standard range than the air pressure supplied to 100), it is determined that air has leaked from the end-face contact part 11, and the control unit's judgment result is transmitted to the machine tool through the control panel. Ensure that it is delivered to the operator (user).

The elastic deformable body 200 according to the present invention is formed in a circular ring shape and is installed on the outer peripheral surface of the spindle 20 to be located at one end of the air passage 100 formed in the spindle 20.

The elastic deformable body 200 is connected to a main body 220 in which an air hole 210 is formed and whose external shape is unchanged by air, and is elastically deformed by air and comes in close contact with the surface of the spindle 20, making it airtight. It includes an elastic portion 230 that maintains.

The main body 220 of the elastic deformable body 200 is formed with a T-shaped cross section.

The elastic part 230 of the elastic deformable body 200 is coupled to both sides of the main body 220, and is coupled to an open elastic lip 231 that is coupled to open both sides of the main body 220, or both sides of the main body 220 and a closed space ( It may be formed as one of the closed elastic grains 232 forming 240).

1 to 5 show a structure in which an open elastic lip 231 is installed, and the open elastic lip 231 is an elastic deformable body 200 that is in close contact with the outer peripheral surface of the spindle 20 when high-pressure air is supplied to maintain airtightness. I do it.

6 and 7 show the sealed elastic lip 232, and the sealed elastic lip 232 is an elastic deformable body 200 that is in close contact with the parts on the outer peripheral surface and both sides of the spindle 20 when high-pressure air is supplied to ensure airtightness. will be maintained.

The air hole 210 formed in the main body 220 of the elastic deformable body 200 includes a first air hole 211 and a second air hole 212 formed at opposite positions along the circumferential direction of the elastic deformable body 200. Includes.

The first air hole 211 is not connected to the air passage 100 formed in the spindle 20, and only the second air hole 212 is connected to the air passage 100.

That is, the first air hole 211 penetrates the outer peripheral surface of the main body 220 of the elastic deformable body 200, is connected to the airline 500 of the solenoid valve 600, and penetrates both sides of the main body 220 to form an elastic section. It is formed to be open toward (230).

The second air hole 212 is formed to penetrate the outer and inner peripheral surfaces of the main body 220 of the elastic deformable body 200 and be connected to the air passage 100.

As described above, the embodiment according to the present invention maintains a close contact state of the end-face contact portion 11 in a structure in which the tool holder 10 and the spindle 20 are in double contact at the end-face contact portion 11 and the tapered contact portion 12. As a device that can be checked, the configuration utilizes an elastic deformable body 200 that is elastically deformed by high-pressure air to maintain airtightness, and an air sensor 400 that detects air leakage of the end surface contact portion 11, and is similar to a conventional gap sensor. Compared to the structure that checks the adhesion of the tool holder using a , it has the advantage of being inexpensive and easy to install, making it easy to use.

Although the present invention has been shown and described in relation to specific embodiments, it is known in the art that various improvements and changes can be made to the present invention without departing from the technical spirit of the invention as provided by the following claims. This will be self-evident to those with ordinary knowledge.

1 - Spindle 10 - Tool holder
11 - single-sided contact part 12 - tapered contact part
20 - spindle 30 - bearing
40 - Housing 100 - Air passage
200 - Elastic deformable body 210 - Air hole
211 - 1st air hole 212 - 2nd air hole
220 - main body 230 - elastic part
231 - Open elastic lip 232 - Closed elastic lip
240 - Closed space 300 - Air supplier
400 - Air Sensor 500 - Airline
600 - Solenoid valve

Claims (10)

A device for checking the adhesion status of the tool holder of a machine tool that can check the adhesion status of the end-face contact area in a structure where the tool holder and the spindle are in double contact at the end-face contact area and the tapered contact area,
an air passage formed through the spindle and connected to the cross-sectional contact portion;
An elastic deformable body that is installed on the spindle and is elastically deformed by the supplied air, and is in close contact with the spindle surface during elastic deformation to maintain airtightness;
An air supply device that supplies high-pressure air to the elastic deformable body; and
An air sensor that detects the amount of leakage from the end-face contact portion by spraying air at a certain pressure into the air passage while the elastic deformable body is in close contact with the spindle surface and maintains airtightness; confirming the adhesion state of the tool holder of the machine tool, including a. Device. In claim 1,
A solenoid valve installed in the airline between the elastic deformable body and the air supply device to control air supply to the elastic deformable body depending on whether the spindle rotates. In claim 2,
The solenoid valve is turned off when the spindle rotates and turned on when the spindle stops. When the solenoid valve is turned off, air supply to the elastic deformable body is stopped, and when the solenoid valve is turned on, air is supplied to the elastic deformable body. Holder adhesion check device. In claim 3,
The air sensor operates when the spindle stops and sprays air at a certain pressure into the air passage to detect the amount of leakage from the end-face contact area. In claim 1,
A device for checking the adhesion state of a tool holder for a machine tool, characterized in that the elastic deformable body is formed in a circular ring shape and installed to be inserted into the outer peripheral surface of the spindle. In claim 1,
The elastic deformable body includes a main body in which an air hole is formed and the external shape remains unchanged due to air; and
An elastic part connected to the main body and elastically deformed by air and in close contact with the spindle surface to maintain airtightness. In claim 6,
The main body is formed with a T-shaped cross section;
The elastic part is coupled to both sides of the main body and is formed of either an open elastic lip that is coupled to open both sides of the main body or a closed elastic lip that forms a closed space with both sides of the main body. Device. In claim 6,
The air hole includes a first air hole and a second air hole formed at opposite positions along the circumferential direction of the elastic deformable body;
A device for checking the adhesion status of a tool holder for a machine tool, characterized in that the first air hole is not connected to the air passage of the spindle and only the second air hole is connected to the air passage. In claim 8,
The first air hole penetrates the outer peripheral surface of the main body, is connected to the air line of the solenoid valve, and penetrates both sides of the main body and opens toward the elastic part. In claim 8,
The second air hole is a device for checking the adhesion status of the tool holder of a machine tool, characterized in that the second air hole penetrates the outer and inner peripheral surfaces of the main body and is connected to the air passage.

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