KR101998117B1 - Cutting heads for hybrid cutting apparatus - Google Patents

Abstract

Disclosed is a cutting head for a hybrid cutting apparatus. The cutting head for a hybrid cutting apparatus is arranged on a front end of a hybrid cutting apparatus connected to a rotary shaft of a machine tool to cut a fine engraved pattern on a machining surface of a workpiece, and comprises: a housing having a storage chamber therein and a horizontal reference surface on a bottom of the storage chamber; a cutting unit which is arranged on an outer circumferential surface of the housing, and has a cutting tool to cut the fine engraved pattern; and a moving unit to move the cutting unit while being installed in the storage chamber. The moving unit includes; a pair of support blocks fixed on the housing, wherein a lower end thereof is tightly attached to the reference surface; a moving block which is arranged between the pair of support blocks, is moved towards the machining surface by a piezo-actuator embedded therein, and moves the cutting unit loaded on an upper side thereof; and a plurality of elastic blocks to elastically connect both sides of the moving block and the pair of support blocks to allow the moving block to perform a movement, and connect an upper and a lower portion of an inner surface of the pair of support blocks and an upper and a lower portion of both sides of the moving block to control to move the moving block straight forwards.

Description

Technical Field [0001] The present invention relates to a cutting head for a hybrid cutting apparatus,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting head for a hybrid cutting apparatus for precisely cutting a workpiece and particularly relates to a cutting head for a hybrid cutting apparatus for precisely cutting oil grooves on the inner surface of a cylinder bore, .

Recently, as semiconductor, aerospace, image information, and precision machinery industries have developed, the need for ultra-precision processing technology is increasing. Ultra-precision cutting technology using diamond tools in the ultra-precision machining method has an infiltration amount of several μm to several tens of micrometers. However, if this infeed amount is controlled to be sub micrometer or less, there is a possibility that an ideal surface without grain boundary step and an defect-free surface can be obtained.

Particularly, in recent super precision machining apparatuses, although the machining accuracy increases with the diameter of the machinable workpiece increases, although the stroke distance of each slide is relatively long by several hundreds of millimeters, a high resolution of 탆 level and high motion Precision is required.

However, in this case, since the inertia mass of the transfer part is very large, the response speed is absolutely slow to compensate for the motion error in real time, and compensation of the real-time motion error becomes very difficult.

In order to overcome this problem, it is necessary to precisely measure the motion precision of the main axis and the transfer system while finely driving only the relatively small mass of the cutting tool and the tool holder using the piezo actuator, A fast tool servo (FTS) is used.

The micro-cutting apparatus using the high-speed response of such a piezo actuator can be applied to a vibration cutting apparatus for producing a dot pattern for forming an oil film on the cylinder bore surface by causing geometric movement at the tip of the tool.

In order to cut a dot pattern (dot groove), the cutting tool repeatedly moves forward and backward. Straightness of the cutting tool is required for accurate machining. The conditions for precise linear motion must be based on the rigid bearing capacity of the cutting tool and must be balanced so that the cutting tool is not biased towards either side.

However, in the past, there have been technical limitations on the support force and the support balance, and improvement thereof has been demanded.

Document 1: Registration No. 10-1583196 Document 2: Published Patent Application No. 10-2011-0071178 Document 3: Registration Patent No. 10-1050777

SUMMARY OF THE INVENTION It is an object of the present invention to provide a cutting head of a hybrid cutting apparatus which can firmly and balancedly support a cutting tool to ensure accurate straightness.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not intended to limit the invention to the precise forms disclosed. Other objects, which will be apparent to those skilled in the art, It will be possible. In particular, the cutting head of the present invention is not limited to the hybrid cutting apparatus, and can be applied to a general cutting apparatus.

According to one aspect of the present invention, there is provided a cutting head for a hybrid cutting apparatus, which is provided at the tip of a hybrid cutting apparatus connected to a rotary shaft of a machine tool and cuts a fine engraved pattern on a machined surface of the workpiece, A housing having a horizontal reference surface at the bottom of the storage chamber; A cutting unit disposed on an outer peripheral surface of the housing and having a cutting tool for cutting the fine engraved pattern; And a retracting unit for retracting the cutting unit while being installed in the accommodating chamber, wherein the retracting unit is fixed to the housing, and the lower end of the retracting unit is in close contact with the reference surface; A forward / backward block which is disposed between the pair of support blocks and which advances / retracts the cutting unit mounted on the upper side while being advanced / retreated toward the machined surface by a piezo actuator incorporated therein; And the pair of support blocks are elastically connected to both sides of the advancing / retreating block so that the advancing and retreating blocks are moved forward and backward, and the upper and lower portions of the inner and lower surfaces of the pair of support blocks are connected to each other, And a plurality of elastic blocks for controlling the blocks to move in an upright position.

Preferably, the advancement / retraction block is provided with a vent hole communicating the inside thereof with the housing chamber of the housing.

According to another aspect of the present invention, there is provided a cutting head for a hybrid cutting apparatus, which is provided at the tip of a hybrid cutting apparatus connected to a rotary shaft of a machine tool and cuts a fine engraved pattern on a machined surface of the workpiece, A housing having a horizontal reference surface at the bottom of the housing chamber; A cutting unit disposed on an outer peripheral surface of the housing and having a cutting tool for cutting the fine engraved pattern; And a retracting unit for retracting the cutting unit while being installed in the accommodating chamber, wherein the retracting unit is fixed to the housing and the lower end is in close contact with the reference surface; A forward / backward block arranged to penetrate the axial center of the support block and to advance / retract the cutting unit mounted on the upper side while being advanced / retreated toward the machined surface by a piezo actuator housed therein; And a plurality of elastic plates interposed between the support block and the advancing and retreating block to support the advancing / retreating block to move forward and backward, and to control the advancing / retreating block to be in an upright motion by supporting the advancing / retreating block in an axially symmetrical manner. A cutting head for a cutting apparatus is provided.

Preferably, the elastic plate has an upper disc spring for elastically supporting an upper portion of the advancing / retreating block such that the advancing / retreating block is elastically moved linearly in the up-and-down direction while the inner circumferential surface is fitted on the upper portion of the outer circumferential surface of the advancing / retreating block. And a lower disc spring for elastically supporting a lower portion of the advancing and retreating block such that the advancing / retreating block is linearly moved in the upward and downward direction while the inner circumferential surface is fitted to the lower portion of the outer circumferential surface of the advancing / retreating block.

Preferably, a plurality of elastic holes are radially formed between the inner circumferential surface and the outer circumferential surface of the upper and lower disc springs to increase or decrease the elastic force of the disc springs.

Preferably, the advancing / retreating unit includes an upper support ring interposed between the upper and lower disc springs to maintain a gap between the disc springs; And a lower support ring for supporting a bottom surface of the lower disc spring.

Preferably, the apparatus further includes a rotation preventing pin provided so as to penetrate the upper and lower disc springs, the upper and lower support rings, and the advancing / retreating block at the same time so as to prevent any rotation of the upper and lower disc springs and upper and lower support rings .

Preferably, the support block and the upper support ring are formed with a plurality of ventilation holes at predetermined intervals in the radial direction.

Preferably, the housing is provided with an air inlet port for supplying cooling air to the housing chamber.

Preferably, the cutting unit includes: a tool holder mounted on the upper portion of the forward / backward block; And a cutting tool coupled to an upper portion of the tool holder.

Preferably, a depression step is provided on one side of the upper surface of the tool holder, and a cooling block provided with an air discharge hole for discharging cooling air toward the cutting tool is provided in the depression step.

The apparatus may further include a pair of distance sensors disposed on both sides of the cutting unit of the housing and each sensing a distance to the machining surface of the workpiece.

Preferably, the fixing block includes a fixing block for fixing the distance sensors, and each of the fixing blocks is provided with an air discharge hole for discharging cooling air toward the respective distance sensors.

Preferably, an elastic body for pulling the axis of the piezoelectric actuator in a direction opposite to the processing surface is provided at a lower portion of the housing.

Preferably, a vent hole is formed in the reference surface of the housing to supply air in the housing chamber to the elastic body.

According to the embodiment of the present invention, the forward and backward blocks of the advancing / retreating unit for advancing and retracting the cutting tool can be firmly and balancedly supported, ensuring accurate straightness, and further capable of precision cutting.

In addition, according to the embodiment of the present invention, by ejecting the cooling air by the cutting tool and the distance sensor, the chip cut from the workpiece can be removed and the cutting heat can be cooled.

In addition, according to the embodiment of the present invention, the ventilation hole communicating the cooling air to the advancing / retreating block, the support block, and the upper support ring is provided to cool the piezo actuator and reduce the weight of the component.

According to the embodiment of the present invention, a distance sensor for measuring the inclination of the rotation center axis is provided on the rotation center axis of the cutting head, so that the rotation center axis of the cutting head coincides with the center line of the workpiece, Accuracy can be increased.

It should be understood that the effects of the present invention are not limited to the above effects and include all effects that can be deduced from the detailed description of the present invention or the configuration of the invention described in the claims.

1 is a perspective view of a cutting head according to first and second embodiments of the present invention in a state of being separated from a hybrid cutting apparatus;
2 is a partially exploded perspective view of the cutting head according to the first embodiment of the present invention.
FIG. 3 is a perspective view showing a completely separated perspective view of a cutting head according to a first embodiment of the present invention.
4 is a sectional view taken along the line AA in Fig. 2
5 is a sectional view taken along line BB of Fig. 2
6 is a sectional view taken along the line CC in Fig. 2
7 is a partially exploded perspective view of the cutting head according to the second embodiment of the present invention.
Fig. 8 is a perspective view showing a completely separated perspective view of a cutting head according to a second embodiment of the present invention.
9 is a cross-sectional view taken along line DD of Fig. 7
10 is a sectional view taken along the line EE of Fig. 7

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention in the drawings, portions not related to the description are omitted, and like reference numerals are given to similar portions throughout the specification.

Throughout the specification, when a part is referred to as being "connected" (connected, connected, coupled) with another part, it may be referred to as "directly connected" "Is included. Also, when an element is referred to as "comprising ", it means that it can include other elements, not excluding other elements unless specifically stated otherwise.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In this specification, the terms "comprises" or "having" and the like refer to the presence of stated features, integers, steps, operations, elements, components, or combinations thereof, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Embodiments of the present invention will now be described with reference to the accompanying drawings.

1 is a perspective view of a cutting head according to first and second embodiments of the present invention separated from a hybrid cutting unit.

1, the cutting head 100, 700 of the present invention is coupled to a tip end of a hybrid cutting unit 10 connected to a rotary shaft (not shown) of a machine tool to form a fine engraved pattern (for example, And an oil groove on the inner surface of the cylinder bore), two embodiments can be proposed.

Of the cutting head  1st Example

2 is a partially exploded perspective view of a cutting head according to a first embodiment of the present invention, FIG. 3 is a fully separated perspective view of a cutting head according to a first embodiment of the present invention, and FIG. 4 is a cross- FIG. 5 is a sectional view taken along the line BB of FIG. 2, and FIG. 6 is a sectional view taken along the line CC of FIG.

2 to 6, a cutting head 100 according to the first embodiment of the present invention includes a housing 200, a cutting unit 300, and a retracting unit 400.

The housing 200 may have therein a receiving chamber 210 in which the components of the cutting head 100 according to the first embodiment are received. In this embodiment, one axial side of the housing chamber 210 may be blocked by the integral cover 220, and the other axial side may be blocked by the detachable cover 230.

The detachable cover 230 can open the storage chamber 210 to house the accessories, and after the assembly, the storage cover 210 can be closed to seal the storage chamber 210. The reason for the sealing is to protect one of the components housed in the housing chamber 210 and to prevent leakage of the cooling air injected into the housing chamber 210. [

The upper side of the housing 200 in the drawing may be opened so that the cutting tool T can be exposed.

The integrated cover 220 of the housing 200 may be provided with an air injection port 221 for injecting cooling air into the storage chamber 210. The cooling air injected through the air inlet port 221 is discharged toward the cutting tool T and the distance sensors S ₁ and S ₂ through the housing chamber 210. Here, the air injection port 221 is connected to the air injection pipe 11 provided in the hybrid cutting unit 10 shown in FIG.

Cable grooves 211 may be provided on both sides of the housing 200. The cable grooves 211 may be a space through which a power line or the like for supplying power to a piezoelectric actuator PZ to be described later passes .

The reference plane BL corresponding to the inner bottom surface of the housing chamber 210 of the housing 200 is made smooth and the lower side of the housing 200 is provided with a pulling member for pulling the axis of the piezo actuator PZ downward, A lid groove 250 may be formed at a lower portion of the recess 240 to receive a lid member 260 for covering the recess.

At this time, the reference surface BL may be provided with a vent hole 212 for allowing cooling air in the accommodating chamber 210 to flow into the recessed portion 240. At least two or more vent holes 212 are preferably formed to allow the cooling air to flow smoothly between the accommodating chamber 210 and the recessed portion 240.

The cutting unit 300 is disposed on the outer circumferential surface of the housing 200 and forms a fine indentation pattern on the machined surface of the workpiece. The cutting unit 300 includes a tool holder 310, And a cutting tool T for cutting the fine engraved pattern.

The cutting tool T is fixed while being inserted into a tool groove 311 provided on the upper surface of the tool holder 310 and is disposed at one side of the upper surface of the tool holder 310 to discharge cooling air toward the cutting tool T A cooling block 320 having an air discharge hole 321 formed therein may be provided.

In this embodiment, a toolder 310 is provided with a depressed step 312 on one side thereof, and the cooling block 320 is seated on the depressed step 312. The cooling block 320 mounted on the depression step 312 supports one side of the cutting tool T and discharges the cooling air to the cutting tool T. [

The reason for discharging the cooling air by the cutting tool T is to remove the cutting chips generated during the cutting operation by the cutting tool and to cool the cutting heat.

The reason why the cooling air is discharged by the cutting tool T is to remove the cutting chips generated during the cutting operation by the cutting tool and to cool the cutting heat of the cutting tool.

The advancing and retracting unit 400 is provided inside the accommodating chamber 210 to advance and retreat the cutting unit 300. The supporting block 410, the advancing and retreating block 420 and the elastic block 430, .

The support block 410 includes first and second support blocks 411 and 412 which are in close contact with a reference surface BL corresponding to a lower surface of the housing chamber 210 in the lower end thereof and are coupled to the inner surface of the integral cover 211 Lt; / RTI > In the present embodiment, the first and second support blocks 411 and 412 may have a flat plate-like structure, and a fastening hole 413 is provided in the width direction, so that the first and second support blocks 411 and 412 are assembled with the integrated cover 211 by screws .

The advancing and retracting block 420 may be disposed between the first and second support blocks 411 and 412 so as to be moved forward by the piezo actuator PZ toward the processing surface. The advance / retreat block 420 is provided with a hollow portion therein, so that the piezoelectric actuator PZ can be housed. The forward / backward block 420 may have a recessed holder seating portion 421 on which the tool holder 310 is mounted.

A vent hole 422 may be formed in a side surface of the advancing and retracting block 420 so as to communicate with the inside of the accommodating chamber 210. The vent hole 422 serves to allow the cooling air in the accommodating chamber 210 to flow into the advance / retreat block 420. In addition, since the vent hole 422 can reduce the weight of the advancing and retracting block 420 to attenuate the forward and backward load, it is possible to improve the precision of the forward and backward movement.

The elastic block 430 elastically connects the first and second support blocks 411 and 412 with the advancing / retreating block 420 to allow the forward / backward movement of the advancing / retreating block, And the upper and lower sides of the advancing / retreating block 420 are connected to control the forward / backward block to be in an upright motion.

Although the elastic block 430 itself can be made of an elastic material, in the present embodiment, the notched portion 431 having a plate-like structure and being thinner than other portions on the plate and being deformed by an external force is formed ≪ / RTI > Since the notch 431 is relatively thin, it is deformed when an external force is applied, thereby enabling forward movement of the advancing / retreating block 420.

4 except that the advancing / retreating block 420 is not deflected during the advancing and retreating movement of the advancing / retreating block 420 by supporting the advancing / retreating block 420 at four points on the supporting block 410 by the elastic block 430 Direction) is possible. Therefore, it is possible to perform precision cutting when cutting a fine pattern, so that reliability of work can be increased.

The cutting head 100 according to the first embodiment includes distance sensors S ₁ and S ₂ disposed on both sides of the cutting unit 300 of the housing 200 and sensing the distance to the machining surface of the workpiece, S ₂ ).

For example, when two distance sensors S ₁ and S ₂ are arranged in parallel on the rotation center axis of the cutting head 100, the measurement values of the two distance sensors are different when the rotation center axis is inclined. In this case, since the two measured values are calculated, the angle of inclination of the rotation axis can be calculated, so that the rotation axis of the cutting head 100 can be adjusted to be close to the center line of the workpiece by adjusting the rotation axis of the machine tool.

Each of the distance sensors S ₁ and S ₂ may be fixed to the housing 200 and the separable cover 212 by the fixing block 500. The fixed block 500 may be provided with an air discharge hole 510 for discharging cooling air toward the distance sensors S ₁ and S ₂ . This air discharge hole 510 is used to prevent the detection performance from being deteriorated by the cutting chip by removing the cutting chip.

The cutting head 100 according to the first embodiment can prevent the cooling air injected into the housing chamber 210 from leaking to a place other than the air discharge holes 311 and 510 by opening the housing 200 A sealing pad 610 may be provided on the upper portion.

The sealing pad 610 seals all the remaining parts except the tool holder 310 and the cutting tool T, thereby preventing the cooling air from leaking unnecessarily.

The sealing pad 610 may be pressed and fixed by an inner pressing plate 620 pressing the inner region and an outer pressing plate 630 pressing the outer region.

In addition, the cutting head 100 according to the first embodiment may be provided with a pulling member 270 for pulling back the piezoelectric actuator PZ.

The pulling member 270 includes a spring holder 271 fitted to the outer circumferential surface of the lower shaft S of the driven actuator PZ passing through the lower portion of the housing 200, A plurality of diaphragm springs 272 which are provided in a press-fit state in the recessed portion 240 of the piezoelectric actuator PZ to pull the lower shaft S of the piezo-electric actuator PZ; And an elastic force adjusting nut 273 for adjusting the elastic force of the diaphragm spring through lifting and lowering of the diaphragm spring.

A lid member 260 for covering the recessed portion is coupled to the lower portion of the recessed portion 240 to prevent any unwinding of the finished nut 273 and to seal the recessed portion 240 do.

The cutting head 100 of the first embodiment described above is assembled in a state in which the lower end of the support block 410 of the advancing / retreating unit 400 is closely attached to the reference plane BL of the accommodating chamber 210, It is possible to prevent the advancing and retracting unit 400 from being slightly displaced during the linear motion, thereby improving the cutting precision.

Since the advancing and retreating block 420 on which the cutting tool T is mounted is symmetrically supported on the pair of support blocks 411 and 412 via the elastic block 430, This is also a condition for increasing the cutting precision.

That is, it is possible to obtain a stable support force in the x direction (feed component), the y direction (straight force), and the z direction (main component) in FIG. 1, particularly in the x and y directions.

Of the cutting head  Second Example

FIG. 7 is a perspective view of a part of a cutting head according to a second embodiment of the present invention, FIG. 8 is a completely separated perspective view of a cutting head according to a second embodiment of the present invention, FIG. 9 is a cross- 7 is a sectional view taken along line EE of Fig.

7 and 10, the cutting head 700 according to the second embodiment of the present invention includes the housing 800, the cutting unit 900, and the advancing / retreating unit 1000 as in the first embodiment described above It is a great deal to do.

Hereinafter, the detailed configuration of each component will be described. The construction overlapping with the first embodiment in the starting process will be described repeatedly for clarity of explanation.

The housing 800 has therein a receiving chamber 810 in which the components of the cutting head 700 according to the second embodiment are received. In this embodiment, one side of the accommodating chamber 810 in the axial direction can be blocked by the integral cover 811, and the other side in the axial direction can be blocked by the detachable cover 812.

The detachable cover 812 can open the housing chamber 810 to house the accessories, and after the assembly, the housing 810 can be closed to seal the housing chamber 810. The reason for the sealing is to protect the components housed in the housing chamber 810 and to prevent leakage of the cooling air injected into the housing chamber 810. [

The upper side of the housing 800 in the drawing may be opened so that the cutting tool T may be exposed.

The integral cover 811 of the housing 800 may be provided with an air injection port 811a for injecting cooling air into the accommodation chamber 810. [ The cooling air injected through the air inlet port 811a is discharged toward the cutting tool T and the distance sensors S ₁ and S ₂ via the housing chamber 810. Here, the air injection port 811a is connected to the air injection pipe 11 provided in the hybrid cutting unit 10 shown in FIG.

An upper block groove 821 on which a fixing block 1500 for fixing the distance sensors S ₁ and S ₂ is seated may be formed on both sides of the upper opening of the housing 800

The reference plane BL corresponding to the inner bottom surface of the housing chamber 810 of the housing 800 is configured to be smooth and the lower side of the housing 800 is provided with a pulling member for pulling the axis of the piezo actuator PZ downward. And a lid groove 832 to which a lid member 1800 for covering the recessed portion is coupled may be provided at a lower portion of the recessed portion 831. [

At this time, a vent hole 811 for allowing the cooling air in the accommodating chamber 810 to flow into the recessed portion 831 may be provided on the reference plane BL. It is preferable that at least two vent holes 811 are formed so that cooling air flows smoothly between the accommodating chamber 810 and the recessed portion 831.

The cutting unit 900 is disposed on the outer circumferential surface of the housing 200 and forms a fine engraved pattern on the machined surface of the workpiece. The cutting unit 900 includes a tool holder 910, And a cutting tool T for cutting the fine engraved pattern.

The cutting tool T is fixed while being inserted into a tool groove 911 provided on the upper surface of the tool holder 910 and the cooling air is discharged toward one side of the upper surface of the tool holder 910 toward the cutting tool T A cooling block 920 having an air discharge hole 921 formed therein may be provided.

In this embodiment, the toe holder 910 is provided with a depressed step 912 on one side of its top surface, and the cooling block 920 is seated on the depressed step 912. The cooling block 920 mounted on the depression step 912 supports one side of the cutting tool T and discharges the cooling air to the cutting tool T. [

The reason for discharging the cooling air by the cutting tool T is to remove the cutting chips generated during the cutting operation by the cutting tool and to cool the cutting heat.

The reason why the cooling air is discharged by the cutting tool T is to remove the cutting chips generated during the cutting operation by the cutting tool and to cool the cutting heat of the cutting tool.

The advancing / retracting unit 1000 includes a supporting block 1100, a advancing / retreating block 1200, an elastic plate 1300, and a fixing member 1400.

The lower end of the support block 1100 may be closely attached to the bottom surface of the housing chamber 810 of the housing 800 and may be fixed to the wall surface of the housing 800 for a strong supporting force.

In this case, the support block 1100 may be formed in a cylindrical shape having upper and lower openings. In this case, the support block 1100 may be formed on both sides of the inner circumferential surface of the housing 800 to be coupled to the housing 800 having a cylindrical structure, A rail groove 1110 is formed on both sides of the outer circumferential surface of the corresponding support member 1100 so as to be combined with the guide rail 830 and slidable into the inside of the housing 800 .

A plurality of ventilation holes 1120 may be radially formed on the outer circumferential surface of the support block 1100. The ventilation holes 1120 are formed at predetermined intervals so that the cooling air injected into the interior of the housing 800 can uniformly enter the support block 1100 when they enter the inside of the support block 1100. This vent hole 1120 can also reduce the weight of the support block 1100.

The coupling structure of the housing 800 and the support block 1100 may include a coupling hole 840 penetrating the inner and outer portions of the guide rails 830 of the housing 800, b of the support block 1100 by pushing inward from the outside of the horizontal fastening hole 830 toward the inside and pressing the rail groove 1110 of the support block 1100 and the other pressing bolt b into the vertical fastening hole 831, And the upper surface of the support block 1100 is pressurized, so that a rigid connection can be made.

The advancing / retracting block 1200 may be installed in the support block 1100 so as to be moved axially toward the processing surface by the piezo actuator PZ.

The advance / retreat block 1200 is provided with a hollow portion 1210 therein and accommodates the piezoelectric actuator PZ. An upper portion of the hollow portion 1210 is provided with a coupling plate 1220 to which the upper portion of the piezoelectric actuator PZ is coupled ).

The upper and lower disc springs 1311 may be separated from the upper and lower sides of the upper and lower disc springs 1311 and 1311. The upper and lower disc springs 1311 and 1311 may be separated from each other. And a lower latching protrusion 1250 for restricting the upward movement of the inner locknut, which will be described later, may be formed on the lower side of the outer circumferential surface.

A plurality of ventilation holes 1260 may be radially formed on the outer circumferential surface between the two engagement protrusions 1240 and 1250 of the advancing / retracting member 1200. The ventilation hole 1260 is formed at a predetermined interval so that the cooling air injected through the ventilation hole 1120 of the housing 800 and the support block 1100 enters the inside of the advancing / It is preferable to be formed.

If the ventilation hole 1260 is formed at an irregular or irregular interval, the cooling air may be biased or irregularly applied to the advancing / retreating block 1200 in the course of entering the inside of the advancing / retreating block 1200 through the vent hole 1260 Air pressure may be applied and this may be an obstacle to the accurate rectilinear motion of the advancing / retracting member 1200.

The elastic plate 1300 intervenes between the support block 1100 and the advancing / retreating block 1200 to elastically support the advancing / retreating block 1200 so as to linearly move toward the processing surface. 1312, an upper support ring 1320, and a lower support ring 1330. [

The upper disc spring 1311 has a fitting hole 1311a formed at the center thereof to be fitted to the outer circumferential surface of the advancing and retracting member 1200 and prevented from being separated upward by the upper engaging protrusion 1240. Between the outer circumferential surface and the inner circumferential surface, A plurality of holes 1311b may be radially formed at regular intervals.

Here, the holes 1311b are for adjusting the elastic strength when the advancing / retreating member 1200 is advanced. For example, when the number of the holes 1311b increases, the elasticity of the portion of the fitting hole 1311a The advancing distance of the advancing / retreating member 1200 becomes longer, and in the opposite case, the advancing distance of the advancing / retreating member 1200 becomes shorter.

In addition, since the holes 1311b are formed at regular intervals, when the advancing-and-retracting member 1200 is advanced, it is possible to support a straight motion in a balanced manner.

The lower disc spring 1312 has the same structure and function as the upper disc spring 1311 except that the mounting position thereof is fitted to the lower stopper 1250 of the outer circumferential surface of the advancing / retracting member 1200.

The upper support ring 1320 is interposed between the upper disc spring 1311 and the lower disc spring 1312 to maintain a gap between the disc springs. The upper support ring 1320 includes an outer support ring 1321 for supporting between the outer end sides of the two disc springs 1311 and 1312 and an inner support ring 1321 for supporting between the inner end sides of the two disc springs 1311 and 1312, And a support ring 1322.

The outer support ring 1321 and the inner support ring 1322 may be formed on the outer circumferential surface with another vent hole 1323 communicating with the vent hole 1260 of the advancing and retracting member 1200.

The lower support ring 1330 supports the bottom surface of the lower disc spring 1312. In this embodiment, the lower support ring 1330 is fixed to the lower surface of the lower disc spring 1312 in the same manner as the upper support ring 1320, An outer support ring 1331 for supporting the outer end side and an inner support ring 1332 for supporting the inner end side of the bottom surface of the lower disc spring 1312. [

The upper and lower disc springs 1311 and 1312 and the upper and lower support rings 1320 and 1330 and the advancing / retreating block 1200 have pin holes PH formed at the same position in the vertical direction. So that these parts can be prevented from being idle in the support member 1100. [0156] This is because the parts inserted into the support member 1100 are all circular and can be rotated during the cutting process, thereby preventing this.

The fixing member 1400 is for preventing a portion of the support block 1100 from being detached from the lower portion. The fixing member 1400 includes an inner lock nut 1410 screwed to the lower end of the outer circumferential surface of the forward / backward block 1200, And an outer lock nut 1420 screwed to the lower end of the inner circumferential surface of the member 1100.

The inner lock nut 1410 is fixed to the inner end side of the upper and lower disc springs 1311 and 1312 and the inner support ring 1322 of the upper support ring 1320 and the inner support ring 1332 of the lower support ring 1330 And a tool groove 1411 can be formed for rotating operation by the tool.

The outer lock nut 1420 is fixed to the outer end side of the upper and lower disc springs 1311 and 1312, the outer support ring 1321 of the upper support ring 1320 and the outer support ring 1331 of the lower support ring 1330 And a tool groove 1421 can be formed for rotational operation by a tool.

The cutting head 700 according to the second embodiment of the present invention includes a pair of or more distance sensors S ₁ and S ₂ for sensing the distance to the machining surface of the workpiece on the upper portion of the housing 800 .

For example, when two distance sensors S ₁ and S ₂ are arranged side by side on the rotational center axis of the cutting unit, when the rotational center axis is inclined, the measured values of the two distance sensors are different from each other. So that the angle at which the rotation axis is inclined can be calculated. Whereby the rotation axis of the machine tool can be adjusted so that the center axis of rotation of the cutting unit coincides with the centerline of the workpiece.

Each of the distance sensors S ₁ and S ₂ may be fixed to the housing 800 by a fixing block 1500. The fixing block 1500 may be provided with an air discharge hole 1510 for discharging cooling air toward the respective distance sensors S ₁ and S ₂ . This air discharge hole 1510 is used to prevent the sensing performance from being deteriorated by the cutting chip by removing the cutting chip.

The cutting head 700 according to the second embodiment of the present invention can prevent the cooling air injected into the housing chamber 810 from leaking to the outside of the air discharge holes 911 and 1510, A sealing pad 1610 may be provided on the open top.

That is, the sealing pad 1610 serves to prevent unnecessary leakage of the cooling air by sealing all the remaining portions except the cutting tool T and a part of the tool holder 900.

The sealing pad 1610 may be pressed and fixed by an inner pressing plate 1620 pressing the inner region and an outer pressing plate 1630 pressing the outer region.

The cutting head 700 of the second embodiment described above is assembled in a state in which the lower end of the support block 1100 is in close contact with the bottom surface of the accommodating chamber 810, 1100) can be prevented from being minutely displaced, so that the cutting precision can be improved.

Since the advancing-and-retracting block 1200 on which the cutting tool T is mounted is biased axially symmetrically by the two disc springs 1311 and 1312, the advancing / retreating block does not shift toward one side, This is also a condition for increasing the cutting precision. That is, it is possible to obtain a stable supporting force in all directions of the x direction (feed component), the y direction (linear force) and the z direction (main component force) in Fig.

In addition, the cutting head 700 according to the second embodiment may be provided with a pulling member 1700 for pulling back the piezoelectric actuator PZ.

The pulling member 1700 includes a spring holder 1710 fitted to the outer circumferential surface of the lower shaft S of the driven actuator PZ passing through the lower portion of the housing 800, A plurality of diaphragm springs 1720 which are provided in a press-fit state in the recessed portion 831 of the piston actuator PZ to pull the lower shaft S of the piezoelectric actuator PZ, And an elastic force adjusting nut 1730 for adjusting the elastic force of the plate spring through lifting and lowering of the plate spring.

A cover member 1800 for covering the recessed portion is coupled to the lower portion of the recessed portion 831 to prevent the elastic force adjusting nut 1730 from being unscrewed and to seal the recessed portion 831 Together.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. It will be understood that various changes and modifications may be made without departing from the scope of the present invention.

100: Cutting head of the first embodiment
200: housing 210: storage chamber
220: integral cover 221: air inlet port
300: cutting unit 310: tool holder
320: cooling block 400: retractable unit
410: support block 420: advance and retreat block
430: elastic block 431:
500: fixed block 510: air discharge hole
610: Sealing pads
700: Cutting head of the second embodiment
800: Housing 810: Storage chamber
811a: air inlet port 900: cutting unit
910: Tool holder 920: Cooling block
1000: retractable unit 1100: support block
1200: advancement block 1300: elastic plate
1400: Fixing member 1410: Inner lock nut
1420: outer lock nut

Claims (15)

A cutting head for a hybrid cutting apparatus, which is provided at the tip of a hybrid cutting apparatus connected to a rotary shaft of a machine tool and cuts a fine engraved pattern on a machined surface of the workpiece,
A housing having a housing chamber therein and a horizontal reference surface at the bottom of the housing chamber; A cutting unit disposed on an outer peripheral surface of the housing and having a cutting tool for cutting the fine engraved pattern; And a forward / backward unit installed in the accommodating chamber to advance / retract the cutting unit,
The forward /
A pair of support blocks fixed to the housing and having a lower end in close contact with the reference surface;
A forward / backward block which is disposed between the pair of support blocks and which advances / retracts the cutting unit mounted on the upper side while being advanced / retreated toward the machined surface by a piezo actuator incorporated therein; And
The pair of support blocks are elastically connected to both sides of the advancing / retreating block so that the advancing and retreating blocks are moved forward and backward, the upper and lower surfaces of the pair of support blocks are connected to the upper and lower sides of the forward / And a plurality of elastic blocks for controlling the movement of the cutting head to be in an upright motion.
The method according to claim 1,
Wherein the forward / backward block is provided with a vent hole communicating the inside thereof with the housing chamber of the housing.
A cutting head for a hybrid cutting apparatus, which is provided at the tip of a hybrid cutting apparatus connected to a rotary shaft of a machine tool and cuts a fine engraved pattern on a machined surface of the workpiece,
A housing having a housing chamber therein and a horizontal reference surface at the bottom of the housing chamber; A cutting unit disposed on an outer peripheral surface of the housing and having a cutting tool for cutting the fine engraved pattern; And a forward / backward unit installed in the accommodating chamber to advance / retract the cutting unit,
The forward /
A cylindrical support block fixed to the housing and having a lower end in close contact with the reference surface;
A forward / backward block arranged to penetrate the axial center of the support block and to advance / retract the cutting unit mounted on the upper side while being advanced / retreated toward the machined surface by a piezo actuator housed therein;
And a plurality of elastic plates interposed between the support block and the advancing and retreating block to support the advancing / retreating block to move forward and backward, and to control the advancing / retreating block to be in an upright motion by supporting the advancing / retreating block in an axially symmetrical manner. Cutting heads for cutting equipment.
The method of claim 3,
Wherein the elastic plate comprises:
An upper disc spring for elastically supporting an upper portion of the advancing and retracting block such that the advancing / retreating block is elastically moved linearly in the up and down direction while the inner circumferential surface is fitted on the upper part of the outer circumferential surface of the advancing / retreating block; And
And a lower disc spring for elastically supporting a lower portion of the advancing / retreating block so that the advancing / retreating block is elastically moved linearly in the up-and-down direction while the inner circumferential surface is fitted to the lower portion of the outer circumferential surface of the advancing / retreating block.
The method of claim 4,
Wherein a plurality of elastic holes are radially formed between the inner circumferential surface and the outer circumferential surface of the upper and lower disc springs in order to increase or decrease the elastic force of the disc springs.
The method of claim 4,
The upper and lower support rings interposed between the upper and lower disc springs to maintain a gap between the disc springs;
Further comprising a lower support ring for supporting a bottom surface of the lower disc spring.
The method of claim 6,
Further comprising a rotation preventing pin provided so as to penetrate the upper and lower disc springs, the upper and lower support rings and the advancing / retreating block at the same time to prevent any rotation of the upper and lower disc springs and the upper and lower support rings Cutting heads for hybrid cutting equipment.
The method of claim 6,
Wherein a plurality of ventilation holes are formed on each side of the support block and the upper support ring at predetermined intervals in the radial direction.
The method according to claim 1 or 3,
Wherein the housing is provided with an air inlet port for supplying cooling air to the accommodating chamber.
The method according to claim 1 or 3,
The cutting unit includes:
A tool holder mounted on the upper portion of the forward / backward block; And
And a cutting tool coupled to an upper portion of the tool holder.
The method of claim 10,
A depression step is provided on one side of the upper surface of the tool holder,
And a cooling block having an air discharge hole for discharging cooling air toward the cutting tool is provided in the depression step portion.
The method according to claim 1 or 3,
Further comprising a pair of distance sensors disposed on both sides of the cutting unit of the housing and each sensing a distance to the machining surface of the workpiece.
The method of claim 12,
And a fixing block for fixing the distance sensors,
Wherein each of the fixing blocks is provided with an air discharge hole for discharging cooling air toward the respective distance sensors.
The method according to claim 1 or 3,
Wherein a lower portion of the housing is provided with an elastic body for pulling the axis of the piezo actuator in a direction opposite to the machining surface.
15. The method of claim 14,
And a vent hole for supplying air in the housing chamber to the elastic body is formed on the reference surface of the housing.

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