KR101937992B1 - Collet Chucking Device and Control Method there of - Google Patents

Abstract

An object of the present invention is to provide a chuck having a large area contact portion and a control method thereof, and more particularly to a chuck chuck for preventing a gripped object from being deformed in accordance with an increase in a bite strength of a chuck during processing of a thin plate pipe, And a control method.
According to an embodiment of the present invention, it is possible to provide a collet chuck apparatus configured to expand a contact area between a collet chuck and an object to be processed so that the pressure of the collet chuck is not concentrated on a specific portion of the object when the collet chuck is stuck to the object.

Description

Technical Field [0001] The present invention relates to a collet chuck device,

The present invention relates to a collet chuck apparatus having a large area contact portion and a control method thereof, and more particularly to a collet chuck apparatus having a large area contact portion, and more particularly to a collet chuck apparatus having a large area contact portion, And a control method thereof.

The contents described in this section merely provide background information on the embodiment of the present invention and do not constitute the prior art.

When a thin material such as plastic or aluminum is processed into a thin sheet, the outer surface of the chuck is pressed against the inner peripheral surface of the object to be processed or the inner surface of the chuck is pressed against the outer peripheral surface of the object.

In this case, since the pressure is concentrated on the part where the chuck is partially deformed, the object is deformed. Such deformation leads to defective product, so it is necessary to solve this problem.

On the other hand, in order to operate the collet chuck device, a cylinder using a working fluid such as a hydraulic pressure or a pneumatic pressure is generally used.

In this case, the degree of engagement of the object to be processed can be measured by measuring the pressure of the working fluid for operating the cylinder, which has a problem that the degree of deformation of the object can not be precisely confirmed.

In particular, it is difficult to determine how much deformation occurs when a certain amount of force is applied, so that it is difficult to set a proper strength of the engagement. Therefore, it is necessary to check the pressure so that appropriate pressure can be applied according to the material of the object and the object of processing.

That is, it is necessary to set the engaging force of the chuck differently depending on the material to be machined or the thickness to be machined.

An object of the present invention is to provide a collet chuck which is capable of increasing a contact area between a collet chuck and an object to be processed, The collet chuck device being configured so that it is not concentrated in the region.

It is another object of the present invention to provide a collet chuck capable of checking how much force is applied to a thin portion of an object to be processed when the object is deformed due to the engaging force, Device.

The technical object of the present invention is not limited to the above-mentioned technical objects and other technical objects which are not mentioned can be clearly understood by those skilled in the art from the following description will be.

According to an aspect of the present invention, there is provided a collet chuck apparatus for gripping an object, comprising: an actuator having a first pressure sensor for measuring a pressure of a working fluid; An actuating shaft connected to the actuator and performing a linear reciprocating motion and having a first inclined surface on one side;

Wherein the collet chuck is provided with a plurality of collet chucks each having an arcuate cross section, each of the collet chucks being arranged in a cylindrical shape, the inner circumferential surface of the collet chuck having a second inclined surface opposed to the first inclined surface, ;

A body having a first guide portion guiding axial movement of the actuating shaft and a second guide portion guiding the radial movement of the collet chuck; Resilient means coupled to the collet body to allow separation between adjacent collet chucks; And

And a second pressure sensor provided to measure a pressure formed between the collet chuck and the object.

According to an embodiment, the second pressure sensor may comprise an FSR sensor.

The second pressure sensor may be configured to be installed at a contact portion between the object and the collet chuck.

A sensor groove for receiving the second pressure sensor may be formed on an outer circumferential surface of the collet chuck, and the second pressure sensor may be mounted on the sensor groove.

And the depth of the sensor groove may be formed such that the second pressure sensor protrudes slightly from the outer circumferential surface of the collet chuck.

The collet chuck device for gripping the above object includes an input unit,

And a controller communicating with the input unit, the first pressure sensor, and the second pressure sensor.

Here, the control unit sets a reference value based on the input value received from the input unit, and determines whether to apply the pressure value by the first pressure sensor or the pressure value by the second pressure sensor according to the reference value .

Further, the collet chuck device for gripping the above-mentioned object includes an input unit,

And a controller communicating with the input unit and the second pressure sensor.

The controller may be configured to set a reference value for the input value received from the input unit and to control the actuator by comparing the reference value with pressure information received from the second pressure sensor.

The collet chuck apparatus for holding the object described above may match first information on the input object and second information on the processing of the input object with the pressure information received from the second pressure sensor, And if the first and second information are re-input, the control unit controls the actuator based on the previously stored pressure information.

According to an embodiment, the first information may be information on a material of the object, and the second information may be information on a processing target thickness of the object.

The second guide unit may include a plurality of slots for guiding radial movement of connection pins formed at the ends of the collet chucks and a locking ring for closing the slots so that the connection pins do not come off.

According to another aspect of the present invention,

An actuator having a first pressure sensor for measuring the pressure of the working fluid;

Wherein the collet chuck is divided into a plurality of collet chucks each having an arcuate section, the collet chucks being arranged in a cylindrical shape, each of the collet chucks being radially moved A collet body whose diameter is expanded or contracted in a radial direction; And

And a second pressure sensor installed on the collet body for measuring a pressure formed between the collet chuck and the object.

The collet chuck apparatus according to this aspect may include an input unit and a control unit for communicating with the input unit, the first pressure sensor, and the second pressure sensor, as well as the collet chuck apparatus for holding the object described above.

Here, the control unit sets a reference value based on the input value received from the input unit, and determines whether to apply the pressure value by the first pressure sensor or the pressure value by the second pressure sensor according to the reference value .

The collet chuck apparatus according to this aspect may further include an input section and a control section in communication with the input section and the second pressure sensor.

The controller may be configured to set a reference value for the input value received from the input unit and to control the actuator by comparing the reference value with pressure information received from the second pressure sensor.

The collet chuck device according to the present invention matches first information on the input object and second information on the processing of the input object with pressure information received from the second pressure sensor, And a controller for controlling the actuator by holding the pre-stored pressure information when the first and second information are re-inputted in the future.

As described above, according to an embodiment of the present invention, there is provided a collet chuck apparatus configured to expand a contact area between a collet chuck and an object to be processed so that the pressure of the collet chuck is not concentrated on a specific portion of the object when the collet chuck is stuck to the object. can do.

Further, it is possible to provide a collet chuck device capable of checking how much force is applied to a thin portion of an object to be processed when the object is deformed by the engaging force and controlling the object based on the force .

In addition, the effects of the present invention have various effects such as excellent general versatility according to the embodiments, and such effects can be clearly confirmed in the description of the embodiments described later.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and, together with the description of the invention given above, serve to provide a further understanding of the technical idea of the present invention. And should not be construed as limiting.
1 shows a collet chuck apparatus according to an embodiment of the present invention.
2 shows a cross-sectional view of a collet chuck device according to an embodiment of the invention.
Fig. 3 shows a collet chuck constituting a collet body in the collet chuck apparatus of Fig. 1;
Fig. 4 shows a fastening ring constituting a second guide part of the body.
Fig. 5 shows a disk base in which slots are formed in the radial direction.

Hereinafter, an embodiment of the present invention will be described in detail with reference to exemplary drawings.

It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, the size and shape of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms specifically defined in consideration of the constitution and operation of the present invention are only for explaining the embodiments of the present invention, and do not limit the scope of the present invention.

1 shows a collet chuck apparatus according to an embodiment of the present invention. 2 shows a cross-sectional view of a collet chuck device according to an embodiment of the invention.

Fig. 3 shows a collet chuck constituting a collet body in the collet chuck apparatus of Fig. 1; Fig. 3 (a) shows a section of an arc shape of the collet chuck, and Fig. 3 (b) shows a perspective view of the collet chuck.

Fig. 4 shows a fastening ring constituting a second guide portion having a collet body. Fig. 5 shows a disk base in which slots are formed in the radial direction.

The collet chuck apparatus 100 according to an embodiment of the present invention includes an actuator 160 having a first pressure sensor for measuring a pressure of a working fluid;

An actuating shaft (110) connected to the actuator and reciprocating linearly and having a first inclined surface (111) at one side;

The collet chuck is divided into a plurality of collet chucks each having an arc-shaped cross section (122), the collet chucks being arranged in a cylindrical shape, A collet body 120 having two inclined surfaces 121;

A body 130 having a first guide part 135 for guiding axial movement of the actuating shaft 110 and a second guide part 132 for guiding radial movement of the collet chuck;

An elastic means (140) coupled to the collet body (120) to permit spacing between adjacent collet chucks; And

A second pressure sensor (150) provided to measure a pressure formed between the collet chuck and the object; ≪ / RTI >

Actuator 160 may be a cylinder device operating with hydraulic pressure, pneumatic pressure or the like according to the embodiment. The actuator 160 may be configured to include the cylinder block 161, the cylinder head 162, the piston 163, and the connector 164 according to the embodiment.

The connector 164 may be connected to the fluid tank via a fluid supply line. The connector 164 may function to receive a working fluid from the fluid tank and transfer it to the cylinder head 162. The cylinder head 162 may serve to supply working fluid to the cylinder block 161. The cylinder block 161 and the cylinder head 162 may be coupled to one end of the body 130. The cylinder head 162 may rotate together with the body 130 to supply the working fluid to the cylinder block 161.

The piston 163 is installed in the cylinder block 161 and can reciprocate linearly in the axial direction by the working fluid. An operation shaft 110 may be connected to an end of the piston 163, and the piston 163 may reciprocate the operation shaft 110 linearly.

The actuating shaft 110 may serve to expand or contract the diameter of the collet body 120 by the driving force of the actuator 160. The operation shaft 110 may include a head portion formed at one side in a conical shape and the other side may be connected to an end of the piston 163 and move together with the piston 163 by a linear reciprocating motion of the piston 163. [ .

The collet body 120 may have a structure formed in a cylindrical shape and may be divided into collet chuck members having a plurality of arcuate end faces 122 that are terminated along the center line according to the embodiment. Each of the collet chuck members is disposed so as to surround the conical head portion of the above-described actuating shaft 110 in a cylindrical shape, and the collet body 120 is a structure in which the diameter can be expanded by the distance between adjacent collet chucks.

The resilient means 140 apply force to bring the adjacent collet chuck members into close contact with each other while allowing separation between adjacent collet chucks. The resilient means 140 may be installed in one or more grooves formed in the outer circumferential surface of the collet body 120.

The operation shaft 110 may be formed such that the outer peripheral surface of the head portion, which is conically formed on one side, has a first inclined surface 111. Here, the first inclined surface 111 means an outer circumferential surface inclined from the center line when the outer diameter of the head portion of the actuating shaft 110 is enlarged or contracted from one side toward the other along the center line of the actuating shaft 110 can do.

The inner circumferential surface of the collet body 120 may be formed to have the second inclined surface 121. Here, the second inclined surface 121 may mean an inner circumferential surface inclined from the center line when the inner diameter dimension is reduced or expanded along the center line of the collet body 120 from one side toward the other.

The first inclined surface 111 and the second inclined surface 121 may be opposed to each other and the first inclined surface 111 may be pressed into the collet body 120 while the operation shaft 110 is inserted into the collet body 120, 2, the plurality of collet chucks disposed in the circumferential direction along the circumference of the head portion of the actuating shaft 110 are radially moved.

The inner circumferential surface of the collet body 120 can form the second inclined surface 121 in all the regions from one end to the other end according to the embodiment and the outer peripheral surface of the head portion of the actuating shaft 110 is also covered with the entire area from one end to the other end The first inclined surface 111 can be formed. Accordingly, when the collet body 120 is expanded and the outer circumferential surface presses the inner circumferential surface of the object, the pressing force is uniformly distributed along the center line, and deformation of the object is suppressed.

The connection pins 123 may be formed at the ends of each of the plurality of collet chucks. Since the plurality of collet chucks of the disk base 134 are disposed along the circumferential direction, the connecting pin 123 can also be disposed along the circumferential direction.

The disk base 134 may be fitted to one end of the body 130.

The disc base 134 may have a through-hole formed at the center thereof in a disc shape, and the linear reciprocating movement of the actuating shaft 110 may be guided by the through-hole. The first guide portion 135 may include the through-hole.

The disk base 134 may have a plurality of slots 133 extending in the radial direction and the connection pins 123 may be slidably inserted in the slots 133. [ The opening of the plurality of slots 133 is closed by the fastening ring 131 to prevent the collet chuck from being released. The second guide portion 132 may include a plurality of slots 133 formed in the disk base 134 and a fastening ring 131.

When the operation shaft 110 is further inserted into the collet body 120, the gap between the adjacent collet chucks supported by the elastic end portion is enlarged, and the diameter of the collet body 120 is expanded to press the inner peripheral surface of the object, When the actuating shaft 110 retracts from the collet body 120, the gap between the adjacent collet chucks is narrowed by the elastic means 140, and the diameter of the collet body 120 is reduced to release the fixation.

The actuator 160 may be configured to include a fluid tank for storing and supplying the working fluid. The first pressure sensor may comprise a sensor for measuring the pressure of the working fluid. The first pressure sensor may be installed in a fluid tank for supplying a working fluid such as oil or air to the actuator 160 or a fluid line through which the working fluid moves, and may be a hydraulic system, a pneumatic system, or the like for measuring the pressure of the working fluid .

The first pressure sensor may be a sensor for measuring the pressure of the working fluid while the second pressure sensor 150 may be a sensor provided for measuring the pressure formed between the collet chuck and the object.

The second pressure sensor 150 may be an FSR sensor, depending on the embodiment. When the FSR sensor receives a pressure, the resistance value changes and an electric signal is sent out, so that the pressure between the object and the collet chuck can be measured in real time. The second pressure sensor 150 may be provided at the contact portion between the object and the collet chuck, or may be installed on the operation shaft 110. That is, it can be installed at any position where the pressure formed between the object and the collet chuck can be measured. The pressure generated between the object and the collet chuck may refer to the pressure generated between the outer circumferential surface of the collet chuck and the inner circumferential surface of the object. In addition to the pressure generated at the direct contact portion between the object and the collet chuck, And the pressure generated during the process.

The second pressure sensor 150 may include a sensor for the same purpose as the first pressure sensor except for the first pressure sensor, that is, provided for measuring the pressure of the working fluid, As long as it can be measured.

A sensor groove 124 may be formed on the outer circumferential surface of the collet chuck to accommodate the second pressure sensor 150 and the second pressure sensor 150 may be mounted on the sensor groove 124 have. In this case, the depth of the sensor groove 124 may be set so that the second pressure sensor 150 is slightly protruded from the outer circumferential surface of the collet chuck. The set depth prevents the sensor from being broken by the pressure formed between the collet chuck and the object.

The collet chuck apparatus 100 according to the present embodiment may include an input unit and a control unit. The control unit may be connected to the first pressure sensor or the second pressure sensor 150 in a wired or wireless manner. Here, the control unit may be of any type or an intangible type as long as it can execute the control logic to be described later.

According to the embodiment, the control unit sets a reference value for the input value received from the input unit, and determines whether to apply the pressure value by the first pressure sensor or the pressure value by the second pressure sensor 150 according to the reference value . ≪ / RTI >

The input value may include first information and second information. The first information may mean information relating to the object, and the second information may mean information relating to processing of the object such as a processing method and a processing range of the object. According to an embodiment, the first information may include information on the material of the object, such as whether the material of the object is plastic or aluminum, and the second information may include information on the target thickness and the like of the object.

The first pressure sensor is a sensor provided to measure the pressure of the working fluid and is less accurate than the second pressure sensor 150. [ When the object is a material such as steel, the control unit controls the actuator 160 based on the pressure value received from the first pressure sensor. If the object is soft, such as plastic or aluminum, the control unit controls the actuator 160 The pressure value transmitted from the second pressure sensor 150 can be applied to precisely control.

The controller may control the actuator 160 by setting a reference value based on the input value received from the input unit and comparing the reference value with pressure information received from the second pressure sensor.

The controller can receive the pressure information from the second pressure sensor in real time during the process of sticking the object to the collet chuck and can maintain the accurately set sticking force with respect to the object.

According to the embodiment, the control unit may match the first information on the input object and the second information on the processing of the input object with the pressure information received from the second pressure sensor 150, store the matched value, When the first and second information are re-input, the actuator 160 can be controlled by the pre-stored pressure information.

When an object is machined by a collet chuck, deformation of the object occurs due to the chucking force of the chuck, and it is not known how much deformation occurs when the force is applied. Through the control unit according to the present embodiment, the user can confirm in advance how much deformation force is applied to an object, and can set the maximum sticking force that does not cause deformation of the object. When the object is processed later, the actuator 160 can be controlled so as to grasp the object with the appropriate engaging force through the already inputted information.

In other words, the pressure can be checked so as to apply an appropriate pressure according to the material. Depending on the material of the object, such as which material is to be deflected, or to what extent the processing is performed, You can set it differently.

For example, the user can set a target thickness of 0.1 mm, 0.2 mm, or 0.3 mm through the input unit. The user can set the target thickness of the workpiece such as a plastic material, an aluminum material, or a steel material, In this case, the user inputs the machining information as 0.2 mm, inputs the material information of the object to be machined into aluminum, inserts the object to be machined into the collet body 120, and operates the collet chuck apparatus 100 The controller may control the actuator 160 to perform a test for finding the optimal engagement strength while gradually increasing the engagement strength of the collet chuck.

That is, the control unit gradually increases the engaging strength while receiving the pressure information in real time between the object and the collet chuck from the second pressure sensor 150, and when the object is deformed in the process of gradually increasing the engaging strength, The control unit can secure a change in the increase rate of the bite strength from the pressure information received from the second pressure sensor 150. [

The control unit can determine the optimal engagement strength for each case based on the increase rate of the engagement strength through the above-described test, and can map the processing information, the material information, and the optimum engagement strength and store them as a table.

When the user subsequently inputs the machining information and the material information, the control unit can select the optimal sticking strength from the stored table and control the actuator 160 based on the selected optimum sticking strength.

The collet chuck apparatus 100 according to the present embodiment is a thin plate having a thickness of 0.2 mm or less, and can be useful for processing a pipe made of a soft material (aluminum plastic). The collet chuck apparatus having only the first pressure sensor is difficult to confirm the pressure value at the precise time point at which the object to be processed is deformed. However, according to the present embodiment, the pressure of the object at the correct time can confirm.

According to another embodiment of the present invention, the control unit of the collet chuck apparatus includes a material information collecting step of collecting material information of an object to be processed; A machining information collecting step of collecting machining information of the object to be processed;

A pressure information collecting step of collecting pressure information relating to a pressure generated between the object and the collet chuck while gradually bending the object to be processed with the collet chuck;

And a storing step of storing the material information and the machining information matched with the pressure information and storing the control logic.

In the pressure information collection step, the collection of the pressure information may be terminated at a time point at which the rate of increase of the pressure generated between the object and the collet chuck rapidly changes.

According to another aspect of the present invention, there is provided a collet chuck apparatus including: an actuator having a first pressure sensor for measuring a pressure of a working fluid; Wherein the collet chuck is divided into a plurality of collet chucks each having an arcuate section, the collet chucks being arranged in a cylindrical shape, each of the collet chucks being radially moved A collet body whose diameter is expanded or contracted in a radial direction; And

And a second pressure sensor installed in the collet body for measuring a pressure formed between the collet chuck and the object.

The above description is only illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

The embodiments disclosed in the present invention are not intended to limit the scope of the present invention and are not intended to limit the scope of the present invention.

The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

100: Collet chuck device
110: Operation axis
111: first inclined surface
120: Collet body
121: second inclined surface
122: arc-shaped section of the collet chuck
123: Connection pin
124: sensor home
130: Body
131: fastening ring
132: second guide portion
133: Slot
134: disk base
135: first guide portion
140: Elastic means
150: second pressure sensor
160: Actuator
161: Cylinder block
162: Cylinder head
163: Piston
164: Connector

Claims (10)

An actuator having a first pressure sensor for measuring the pressure of the working fluid;
An actuating shaft connected to the actuator and performing a linear reciprocating motion and having a first inclined surface on one side;
Wherein the collet chuck is provided with a plurality of collet chucks each having an arcuate cross section, each of the collet chucks being arranged in a cylindrical shape, the inner circumferential surface of the collet chuck having a second inclined surface opposed to the first inclined surface, ;
A body having a first guide portion guiding axial movement of the actuating shaft and a second guide portion guiding the radial movement of the collet chuck;
Resilient means coupled to the collet body to allow separation between adjacent collet chucks; And
A second pressure sensor provided to measure a pressure formed between the collet chuck and the object;
Lt; / RTI >
Wherein the actuating shaft has a head portion formed on one side in a conical shape to expand or contract the diameter of the collet body,
Wherein the collet chuck is disposed so as to surround the conical head portion of the operating shaft in a cylindrical shape,
Wherein the outer peripheral surface of the head portion is formed to have the first inclined surface, and when the outer diameter dimension of the head portion of the actuating shaft is enlarged or reduced as the first inclined surface is directed from one side toward the other along the center line of the actuating shaft, Means an outer circumferential surface inclined from the center line of the operating axis,
Wherein the inner peripheral surface of the collet body is formed to have the second inclined surface and the inner diameter of the second inclined surface is reduced or expanded along the center line of the collet body from one side toward the other side, Quot; means an inner circumferential surface inclined from the &
Wherein the first inclined surface and the second inclined surface are in close contact with each other and the operating shaft is inserted into the collet body to press the first inclined surface and press the second inclined surface to move along the circumference of the head portion of the operating shaft The plurality of collet chucks disposed in the circumferential direction are radially moved,
The first inclined face pushes the second inclined face to press the second inclined face so that the pressing force of the collet body is uniformly applied from one end to the other end along the center line of the collet body when the outer peripheral face of the collet body presses the inner peripheral face of the object In order to suppress the deformation of the object,
Wherein an inner circumferential surface of the collet body has the second inclined surface defined by all the regions from one end to the other end,
Wherein all the regions from the one end to the other end of the outer peripheral surface of the head portion of the operating shaft grip an object forming the first inclined surface. The method according to claim 1,
And the second pressure sensor is an FSR sensor. The method according to claim 1,
And the second pressure sensor is installed at a contact portion between the object and the collet chuck. The method of claim 3,
Wherein a sensor groove for receiving the second pressure sensor is formed on an outer circumferential surface of the collet chuck, and the second pressure sensor is mounted on the sensor groove. 5. The method of claim 4,
Wherein the depth of the sensor groove is formed such that the second pressure sensor protrudes slightly from the outer circumferential surface of the collet chuck. The method according to claim 1,
An input unit,
And a controller communicating with the input unit, the first pressure sensor, and the second pressure sensor,
The control unit sets a reference value for the input value received from the input unit and determines whether to apply the pressure value by the first pressure sensor or the pressure value by the second pressure sensor according to the reference value And the collet chuck device grips the object. The method according to claim 1,
An input unit,
And a controller communicating with the input unit and the second pressure sensor,
Wherein the control unit controls the actuator by setting a reference value for the input value received from the input unit and comparing the reference value with the pressure information received from the second pressure sensor to control the actuator, . The method according to claim 1,
The first information on the input object and the second information on the processing of the input object are matched with the pressure information received from the second pressure sensor to store the matched value, And a control unit for controlling the actuator by holding the pre-stored pressure information when the second information is re-inputted. The method according to claim 1,
The second guide portion
A plurality of slots for guiding radial movement of connection pins formed at the ends of the collet chucks and a fastening ring for closing the slots so that the connection pins are not separated from each other. Device. delete

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