KR100777652B1 - Laser apparatus for forming pattern on inside of workpiece - Google Patents

Abstract

A laser machining apparatus is provided to make it possible to form predetermined high quality patterns on the inside of a workpiece using a laser beam, reduce a working time consumed in laser machining, form patterns with the same quality level, enable the apparatus to be applied to workpieces with various sizes, and simplify drive of a motor. A double laser apparatus(200) is characterized in that: the apparatus comprises a laser light source part(210), a beam splitter(BS), a first reflection mirror(240), a second reflection mirror(250), a third reflection mirror(260), a fourth reflection mirror(270), a fifth reflection mirror(280), a first lens(FL1), a second lens(FL2), and a drive part(R1); the laser light source part generates a laser beam; the beam splitter divides the generated laser beam into a first laser beam and a second laser beam to sequentially proceed the first laser beam to the first reflection mirror, the second reflection mirror, the third reflection mirror and the first lens and sequentially proceed the second laser beam to the fourth reflection mirror, the fifth reflection mirror and the second lens; the first and second lenses project the first and second laser beams onto an inner surface of a workpiece(12) to form patterns on the inner surface of the workpiece; and the drive part for rotating a first moving part within the workpiece around a first axis that connects the center of the beam splitter and the center of the first reflection mirror, wherein the first moving part includes the beam splitter, the first reflection mirror, the second reflection mirror, the third reflection mirror, the fourth reflection mirror, the fifth reflection mirror, the first lens, and the second lens.

Description

LASER APPARATUS FOR FORMING PATTERN ON INSIDE OF WORKPIECE

1 is a view illustrating a cylinder block of a general engine and a piston inserted therein.

2 shows the frictional movement of the honed cylinder block bore surface and the piston ring.

3 shows the roughness curve and the load curve of the cylinder block bore surface.

4 is a diagram showing the configuration of a laser processing apparatus for forming a fine pattern on the inner surface of the object to be processed according to the first embodiment of the present invention.

5 is a view for explaining the rotational movement of the laser processing apparatus for forming a fine pattern on the inner surface of the object to be processed according to the first embodiment of the present invention.

FIG. 6 is a diagram illustrating vertical movement of a laser processing apparatus for forming a fine pattern on an inner surface of a workpiece according to a first embodiment of the present invention.

7 is a view showing a dual laser processing apparatus according to a second embodiment of the present invention.

8 is a diagram illustrating a detailed structure of a beam expander according to a second embodiment of the present invention.

9 is a view schematically showing a tilting drive of the laser device according to the second embodiment of the present invention.

FIG. 10 is a diagram illustrating a process of obtaining a depth of focus of a first lens.

11 is a view showing a dual laser processing apparatus according to a third embodiment of the present invention.

12 illustrates a process for generating a laser honing pattern on a cylinder block bore surface in accordance with an embodiment of the present invention.

The present invention relates to a dual laser processing apparatus, and more particularly to a dual laser processing apparatus for performing a fine pattern processing on the inner surface of the object to be processed.

1 is a view illustrating a cylinder block 11 of a general engine and a piston 13 inserted therein.

The engine 10 of FIG. 1 includes a cylinder block 11, a cylinder block bore surface that is a workpiece 12, a piston 13, and a piston ring 14.

The cylinder block 11 consists of the several cylinder in which the piston 13 which reciprocates inside a cylinder block is arrange | positioned.

The piston 13 receives a gas pressure of high temperature and high pressure to reciprocate in the cylinder block to rub against the surface of the cylinder block bore, which is the object to be processed 12.

The piston ring 14 is a ring disposed above the piston. The oil ring prevents oil from entering the combustion chamber from the surface of the cylinder block bore, which is the object to be processed 12, and the compression ring, which prevents the combustion gas from leaking. Ring) The compression ring maintains airtightness during compression and expansion, transfers the high heat received by the piston to the cylinder block, and scrapes off a minimum film of oil to prevent oil from entering the combustion chamber. The oil ring serves to uniformly lubricate oil on the surface of the cylinder block bore, the object to be processed 12, and scrape off excess oil.

2 shows the frictional movement of the honed cylinder block bore surface and the piston ring.

When the piston ring 14 rubs against the cylinder bore surface, which is the object to be machined 12 during reciprocating motion, the cylinder bore surface must have a mesh in the form of a mesh with an appropriate angle of intersection. This can move smoothly. Without this mesh, the surface becomes excessively smooth, so that a lubricant film is not formed, which is likely to cause a piston stripping phenomenon. That is, the mesh in the form of a mesh having a suitable pier is called the honing pattern (15), which serves as an oil groove to perform the function of the sump.

The bore surface of today's mainstream Recipro Engine, especially considering tribological performance, especially frictional performance, Proof of Tribology, considering reciprocating sliding with piston 13 / piston ring 14 seizure) performance is important. In consideration of such surface function, an oil groove for performing the function of the sump is formed on the surface of a general cylinder block bore by the method of honing.

Honing is a kind of precision finishing that processes the inner surface of a cylinder. In detail, a honing tool is a tool called a horn, in which an abrasive stick is inserted around the cylinder. It is a method of precision machining by lightly contacting movement. The honing pattern 15 is related to the friction performance and the scissor performance between the piston 13 and the engine cylinder bore surface, which is the object to be processed 12, and therefore has an important influence on the engine performance.

3 shows the roughness curve and the load curve of the cylinder block bore surface.

Surface roughness refers to the degree of minute unevenness occurring on the surface when the metal surface is finished. No matter what method of production is adopted, it is practically impossible to machine geometrically ideal perfect surfaces. Magnified photographs show that the machined surface looks like a mountain with many peaks and valleys. In indicating the degree of roughness, the surface is cut into a plane perpendicular to the workpiece and the cross section shows a curve. A statistical value representing the degree of roughness is called a roughness parameter.

The roughness curve shown in FIG. 3 may distinguish the cross section of the cylinder bore surface by the roughness parameters of peak R _pk , central surface R _k , and valley R _vk .

M _r1 of the load curve of FIG. 3 means the ratio of peak to the entire cylinder bore surface, and M _r2 means the ratio of Valley to the entire cylinder bore surface.

R _pk is the peak of roughness, meaning the highest point of cylinder bore surface roughness. Therefore R _pk Is the most prone to wear when the piston 13 / piston ring 14 reciprocates. R _k is the central portion of the cylinder bore surface roughness, which can be viewed as the average roughness of the entire section. R _vk Is the depth of the valley, which is an indication of the oil groove in which the lubricant is maintained.

Therefore, excessive R _pk or R _vk may adversely affect the frictional movement between the piston and the engine cylinder bore surface, which is the object 12, and thus the importance of the honing processing technique for processing the cylinder bore surface can be seen.

Conventional honing processing method has a problem that it is difficult to form a certain quality machining pattern due to the wear of the grindstone during cutting and grinding because the inner diameter machining using a grindstone. In addition, there is a problem that the maintenance cost increases because the grinding wheel must be replaced frequently.

U.S. Patent No. 5,441,439 discloses a method of honing a workpiece surface using a laser. U.S. Patent No. 5,441,439 describes a honing process in which a first step of honing is performed to form a minimum roughness on a workpiece surface, and a second step is to use a laser to form grooves at regular intervals on a workpiece surface having a minimum roughness. It is starting.

However, U. S. Patent No. 5,441, 439 only introduces a process for performing honing processing using a laser, and does not disclose any specific configuration of a laser apparatus capable of efficiently performing such honing processing.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and a technical object of the present invention is to provide a laser processing apparatus capable of forming a certain high quality processing pattern on the inner surface of a processing object using a laser beam.

Another object of the present invention is to separate a single laser beam into a first laser beam and a second laser beam and process two portions at the same time, thereby shortening the working time required for laser processing and the path length of the first laser beam traveled. The present invention provides a laser processing apparatus capable of performing pattern processing of the same quality by making path lengths in which the and second laser beams travel the same.

Still another object of the present invention is to allow the user to select and drive the moving part according to the size of the object to be applied to the object of various sizes, and by tilting and driving only the lens and the mirror, the vertical movement of the whole moving part can be omitted. It is possible to provide a laser processing apparatus that can simplify motor driving.

As a technical means for achieving the above object, the first aspect of the present invention is a laser light source unit, a beam splitter, a first reflection mirror, a second reflection mirror, a third reflection mirror, a fourth reflection mirror, a fifth reflection mirror, And a first lens and a second lens, wherein the laser light source unit generates a laser beam, the beam splitter separates the generated laser beam into a first laser beam and a second laser beam, and the first laser beam Proceed to the first reflective mirror and the second laser beam proceeds to the fourth reflecting mirror, wherein the first reflecting mirror directs the first laser beam to the second reflecting mirror, and the second reflecting mirror is the first laser Directs the beam to a third reflective mirror, wherein the third reflective mirror directs the first laser beam to the first lens, the fourth reflective mirror directs the second laser beam to the fifth reflective mirror, and The fifth reflection mirror advances the second laser beam to the second lens, and the first lens and the second lens respectively enter the first laser beam and the second laser beam onto the inner surface of the object to be processed. It provides a dual laser processing apparatus characterized in that.

According to a second aspect of the present invention, there is provided a method of honing an inner surface of a cylindrical workpiece, comprising: a first step of performing rough honing, a second step of performing intermediate finishing honing, and a dual laser processing apparatus Provided is a honing processing method comprising a third step of performing laser microgroove processing and a fourth step of performing final finishing honing processing.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

Throughout the specification, when a part is "connected" to another part, this includes not only "directly connected" but also "electrically connected" with another element in between. . In addition, when a part is said to "include" a certain component, which means that it may further include other components, except to exclude other components unless otherwise stated.

Laser processing apparatus according to an embodiment of the present invention is preferably used for processing the inner surface of the object having a cylindrical shape, but is not necessarily limited to this, if necessary, the inner surface of the object having a shape other than the cylindrical. It can also be used for processing.

4 is a diagram showing the configuration of the laser processing apparatus 100 for forming a fine pattern on the inner surface of the object to be processed according to the first embodiment of the present invention.

The laser processing apparatus 100 according to the first embodiment of the present invention includes a laser light source unit 110, a first reflection mirror 120, a focusing lens 130, and a second reflection mirror 140.

The laser light source unit 110 performs a function of supplying a laser beam for internal diameter processing. For example, an Nd: YAG type or Nd: YVO4 type laser source is provided to generate a CW wave laser beam having a wavelength of 1064 nm, and further includes a Q switch element to generate a pulse wave. wave) may be generated. The laser beam generated by the laser light source unit 110 is incident to the first reflection mirror 120.

The first reflection mirror 120 may be installed at a position for changing the traveling direction of the laser beam to control the traveling direction change angle. The first reflection mirror 120 changes the traveling direction of the laser beam supplied from the laser light source unit 110 to the focusing lens 130.

The focusing lens 130 is installed to control the path length X + Y until the laser beam is scanned on the object to be processed. In this case, an auto focusing function through motor control may adjust a path length X + Y until the laser beam is scanned from the focusing lens 130 to the processing object. The laser beam passes through the focusing lens 130 and enters the second reflection mirror 140.

The second reflection mirror 140 is installed so that the laser beam passing through the focusing lens 130 is scanned on the surface of the object to be processed. The laser beam incident on the second reflection mirror 140 is scanned on the inner surface of the cylinder to perform fine pattern processing.

In order to perform a predetermined pattern processing on the entire inner surface of the cylinder, the cylinder itself, which is the object to be processed, may be moved up and down, or the moving part R including the focusing lens 130 and the second reflection mirror 140 may be vertically moved. And rotational movement. If the range of the movement is not large and the path length error of the laser beam to be scanned is acceptable, the moving unit R may include only the second reflection mirror 140. Alternatively, the cylindrical inner surface and the moving part R may select one of the vertical movement and the rotational movement, respectively.

5 is a view for explaining the rotational movement of the laser processing apparatus 100 for forming a fine pattern on the inner surface of the object to be processed according to the first embodiment of the present invention.

  When the moving part R of the laser processing apparatus 100 rotates 360 degrees with respect to the axis in the cylinder, the laser beam 111 whose direction of travel is changed by the second reflection mirror 140 rotates the moving part R. Because of this, because it is scanned on the cylindrical inner surface of the object to be processed 12 while rotating 360 ° around the axis, it is possible to form a fine pattern on the entire circumference of the cylindrical inner surface of a certain height.

In addition, as mentioned above, the moving part R can be fixed, and the same effect can also be acquired by rotating the cylindrical inner surface which is the object 12 to be rotated 360 degrees.

6 is a diagram illustrating a vertical movement of the laser processing apparatus 100 that forms a fine pattern on the inner surface of the object to be processed according to the first embodiment of the present invention.

In FIG. 6, the moving part R is illustrated to include only the second reflective mirror 140, but may also include the focusing lens 130 as described above.

The moving part R moves up and down in the cylinder to adjust the height of the spot SP of the laser beam 111 to a constant height of the inner surface of the cylinder to be subjected to the fine pattern processing. Since the laser beam 111 to be scanned also moves up and down due to the vertical movement of the moving part R, pattern processing using the laser beam 111 can be performed on the entire height of the inner surface of the cylinder.

 The moving unit R performs a fine pattern processing while rotating the entire circumference of a predetermined height about 360 degrees with respect to the axis within the cylindrical inner surface, and then moves up and down to a higher or lower height than the predetermined height. In other words, after the laser beam 111 performs the fine pattern processing on the entire unprocessed circumference of the predetermined height of the inner surface of the cylinder, the laser beam 111 moves up and down to the unprocessed height higher or lower than the predetermined height.

Through the stepwise repetitive operations of the rotational movement and the vertical movement of the moving part R, the laser processing apparatus 100 may perform fine pattern processing on the entire inner surface of the cylinder, which is the object to be processed 12.

In addition, by performing the combination of the above-described rotational movement and vertical movement of the cylinder, fine pattern processing may be performed on the entire inner surface of the cylinder.

7 is a diagram illustrating a dual laser processing apparatus 200 according to a second embodiment of the present invention.

The dual laser processing apparatus 200 of FIG. 7 includes a laser light source unit 210, a first reflection mirror 240, a second reflection mirror 250, a third reflection mirror 260, a fourth reflection mirror 270, and a second reflection mirror 270. And a fifth reflection mirror 280, a sixth reflection mirror 220, a beam expander 230, a beam splitter BS, a first lens FL1, and a second lens FL2.

The first moving part R1 of the dual laser processing apparatus 200 includes a beam splitter BS, a first reflection mirror 240, a second reflection mirror 250, a third reflection mirror 260, and a fourth reflection mirror. 270, a fifth reflection mirror 280, a first lens FL1, and a second lens FL2.

In addition, the dual laser processing apparatus 200 may include a driving unit (not shown) for rotating the moving unit R1 and a driving unit (not shown) for vertically moving the moving unit R1.

The laser light source unit 210 performs a function of supplying a laser beam for internal diameter processing. For example, an Nd: YAG or Nd: YVO4 type laser source is provided to generate a CW wave laser beam having a wavelength λ of 1064 nm, and further includes a Q switch element to provide a pulse wave. wave) may be generated. The laser beam generated from the laser light source unit 210 is incident to the sixth reflective mirror 220.

Preferably, the sixth reflective mirror 320 uses a mirror having a reflectance of 100%, and is installed at a position to change the traveling direction of the laser beam to control the angle of changing the traveling direction of the laser beam. Therefore, the traveling direction of the laser beam generated from the laser light source unit 210 is changed to the beam expander 230.

The beam expander 230 may control the spot size of the laser beam finally incident on the object by controlling the diameter of the laser beam. The beam expander 230 adjusts the diameter of the laser beam incident from the sixth reflective mirror 220 to an appropriate size and enters it into the beam splitter BS.

The beam splitter BS reflects a portion of the incident laser beam and transmits the remaining portion, thereby separating the incident laser beam. In this embodiment, it is preferable to separate the laser beam at a ratio of 50:50 by using a member having a reflectance and a transmittance of 50% as the beam splitter BS. The laser beam whose diameter is enlarged by the beam expander 230 is partially reflected by the beam splitter BS and proceeds as the first laser beam LS1, and the remaining part of the laser beam passes through the beam splitter 340. It advances as 2nd laser beam LS2. The first laser beam LS1 travels in a direction toward the first reflection mirror 240.

The first reflection mirror 240 preferably uses a mirror having a reflectance of 100%, and directs the traveling direction of the first laser beam LS1 to the second reflection mirror 250.

Preferably, the second reflection mirror 250 also uses a mirror having a reflectance of 100%, and directs the traveling direction of the first laser beam LS1 reflected from the first reflection mirror 240 to the third reflection mirror 260. To face.

The third reflection mirror 260 also preferably uses a mirror having a reflectance of 100%, and directs the traveling direction of the first laser beam LS1 reflected from the second reflection mirror 250 to the first lens FL1. do.

The first lens FL1 collects the first laser beam LS1 incident from the third reflection mirror 260 at the pattern forming portion of the object to be processed.

Fine pattern processing is performed on the inner surface of the object 12 using the first laser beam LS1 collected at the first spot SP1 by the first lens FL1.

On the other hand, the fourth reflective mirror 270 preferably uses a mirror having a reflectance of 100%, and the traveling direction of the second laser beam LS2 transmitted through the beam splitter BS is directed to the fifth reflective mirror 280. To face.

Preferably, the fifth reflection mirror 280 also uses a mirror having a reflectance of 100%, and directs the traveling direction of the second laser beam LS2 reflected from the fourth reflection mirror 270 toward the second lens FL2. do.

The second lens FL2 collects the second laser beam LS2 incident from the fifth reflection mirror 280 at the pattern forming portion of the object to be processed.

Fine pattern processing is performed on the inner surface of the object 12 by using the second laser beam LS2 collected at the second spot SP2 by the second lens FL2.

The driving unit (not shown) rotates the first moving unit R1 about the first axis AX1 connecting the center of the beam splitter BS and the center of the first reflective mirror 240 in the object 12. Let's do it. Accordingly, the first laser beam LS1 and the second laser beam LS2 are rotated at a predetermined height within the object 12.

After forming the laser fine pattern on the entire circumference of the predetermined height of the object 12, the driving unit (not shown) is first to form a fine pattern around the upper or lower height than the predetermined height of the object 12; The moving portion R1 is moved in the vertical direction. As the first moving part R1 moves in the vertical direction, the first laser beam LS1 and the second laser beam LS2 move in the vertical direction, and thereafter, the first moving part R1 is moved again. By rotating, fine pattern processing can be performed around the unprocessed periphery of the object to be processed 12.

As described above, it is possible to perform precision fine pattern processing on the entire inner surface of the object 12 while repeatedly rotating and vertical movement.

Until now, the driving unit (not shown) has been described as only moving and moving the moving unit R1 within the object 12, but this is only an example and is not necessarily limited thereto, and the driving unit (not shown) is the object to be processed. Direct rotation and vertical movement of 12 are also possible.

According to the second embodiment of the present invention, as shown in FIG. 7, the first laser beam LS1 is formed by the first reflection mirror 240, the second reflection mirror 250, and the third from the beam splitter BS. The path length and the second laser beam LS2 from the above-described beam splitter BS to the fourth through the reflective mirror 260 and the first lens FL1 to the place where the first spot SP1 is formed on the object are processed. The path length from the reflective mirror 270, the fifth reflective mirror 280, and the second lens FL2 to the place where the second spot SP2 is formed on the object is substantially the same. As such, when the path lengths of the first laser beam LS1 and the second laser beam LS2 are substantially the same, pattern processing of substantially the same quality may be performed on the first spot SP1 and the second spot SP2. Can be. In addition, by processing the two parts at the same time by using a laser beam in a double, there is an effect that can reduce the pattern forming work time.

 8 is a diagram illustrating a detailed structure of the beam expander 230 according to the second embodiment of the present invention.

The beam expander 230 includes a first expander lens 231, a second expander lens 232, and a third expander lens 233.

The laser beam reflected by the second reflection mirror 220 includes a first expander lens 231 having a negative refractive index, a second expander lens 232 having a positive refractive index and a negative (-). The light is incident on the beam splitter 240 after passing through the third expander lens 233 having a refractive index of The beam expander 230 moves the first expander lens 231, the second expander lens 232, and the third expander lens 233 up and down to move between the beam expander lenses 231, 232, and 233. By controlling the distance, the diameter of the laser beam incident on the beam expander 231 is controlled.

Up to now, the laser processing apparatus 200 according to the second embodiment of the present invention has been described as including the sixth reflective mirror 220 and the beam expander 230, but this is only an example and is not necessarily limited thereto. Those skilled in the art will readily understand that the sixth reflective mirror 220 and the beam expander 230 may be omitted in the second embodiment and may be replaced by other components.

9 is a view schematically showing a tilting driving of the laser device 200 according to the second embodiment of the present invention.

 As shown in FIG. 9, by tilting the first lens FL1 and the third reflection mirror 260, the upper and lower ranges of the first laser beam LS1 incident on the surface of the object 12 may be extended. Can be. However, the first lens FL1 and the third reflection mirror 260 have a depth of focus of the first lens FL1 so that the first laser beam LS1 can effectively process the object 12. It is preferable to be tilted only within the range of maintaining.

In this way, a range for maintaining the depth of focus of the first lens FL1 is called a tilting effective range T. Within the tilting effective range T, the laser device processes the predetermined height around the predetermined height and then uses the driving unit. It is preferable to process the upper part or the lower part of the predetermined height only by the tilting drive, instead of moving the one moving part R1 up and down.

More specifically, when the first spot SP1 is fixed at a constant height, the first lens FL1 is rotated about the first tilting axis TX1 and the third reflection mirror 260 is second tilted. When rotating about the axis TX2, the first laser beam LS1 is incident on the inner surface of the object 12 at various angles, so that the first spot SP1 is formed at a portion higher or lower than the predetermined height. . When the machining within the tilting effective range T is completed, the drive unit moves the first moving unit R1 up and down.

Since the method of tilting and driving the second lens FL2 and the fifth reflection mirror 280 is the same as the method of tilting and driving the first lens FL1 and the third reflection mirror 260, a detailed description thereof will be omitted. .

As described above, the first moving part R1 is rotated at a predetermined height, and the first lens FL1, the third reflection mirror 260, the second lens FL2, and the fifth reflection mirror 280 are moved. By repeating the tilting operation within the tilting effective range T and moving the first moving part R1 up and down again, the entire inner surface of the object 12 can be processed.

As described above, when the tilting drive is used, the motor driving of the drive unit for moving the first moving unit R1 up and down is simplified.

Hereinafter, the principle of obtaining the depth of focus Δf of the first lens FL1 according to the second embodiment of the present invention will be described. FIG. 10 is a diagram illustrating a depth of focus Δf of the first lens FL1.

The depth of focus Δf of the first lens FL1 means a section in which the laser beam passing through the first lens FL1 can effectively process the object to be processed. Therefore, since the quality of laser processing is deteriorated in a section outside the depth of focus Δf, the tilting effective range T according to the second embodiment of the present invention is preferably determined based on the depth of focus Δf.

The depth of focus Δf of the first lens FL1 may be defined as twice the Rayleigh range, and an approximation thereof may be calculated by the following equations (1) and (2).

(식 1)

(Equation 1)

(식 2)

(Equation 2)

Where Z _R is Rayleigh range, λ is the wavelength of the laser beam, f is the lens constant, D is the effective diameter of the laser beam, and F is the ratio of the lens constant to the effective diameter of the laser beam, respectively.

Therefore, the depth of focus Δf can be obtained by using the values of the wavelength λ of the laser beam, the effective diameter D of the laser beam, and the lens constant f.

Since the process of obtaining the depth of focus Δf of the second lens FL2 is the same as the process of obtaining the depth of focus Δf of the first lens FL1, a detailed description thereof will be omitted.

11 is a diagram illustrating a dual laser processing apparatus 200 according to a third embodiment of the present invention.

As shown in FIG. 11, the configuration of the dual laser processing apparatus 200 according to the third embodiment is almost similar to that of the dual laser processing apparatus 200 according to the second embodiment, but only the configuration of the moving part is different. have.

The second moving part R2 of the dual laser processing apparatus 200 includes a second reflecting mirror 250, a third reflecting mirror 260, and a first lens FL1, and the third moving part R3 is The fourth reflection mirror 270, the fifth reflection mirror 280, and the second lens FL2 are included.

In addition, the dual laser processing apparatus 200 may include a driving unit (not shown) that rotates the second moving unit R2 and the third moving unit R3 and a driving unit (not shown) that moves up and down. .

Specifically, the driving unit (not shown) includes a second axis connecting the second moving unit R2 to the center of the second reflective mirror 250 and the center of the third reflective mirror 260 in the object 12-1. Rotate around (AX2). In addition, the driving unit may be configured to center the third axis AX3 connecting the center of the fourth reflective mirror 270 and the center of the fifth reflective mirror 280 in the object 12-2 with the third moving part R3. Rotate Accordingly, the first laser beam LS1 and the second laser beam LS2 are rotated at predetermined heights in the object 12-1 and the object 12-2, respectively.

After the laser fine pattern is formed in the entire circumference of the predetermined height of the object 12-1, the driving unit (not shown) forms a fine pattern around the height higher or lower than the predetermined height of the object 12-1. In order to move the second moving part R2 in the vertical direction. Due to the movement of the second moving part R2 in the up and down direction, the first laser beam LS1 is moved in the up and down direction, and thereafter, the second moving part R2 is rotated again to process the object 12-1. Fine pattern processing can be performed around the unprocessed perimeter.

At this time, the tilting drive of the second embodiment may be equally applied to the pattern processing operation of the second moving part R2.

The pattern processing operation | work of the 3rd moving part R3 is the same as the pattern processing operation method of said 2nd moving part R2.

As described above, the dual laser device 200 for inner diameter machining according to the third embodiment of the present invention rotates the second moving part R2 and the third moving part R3 at a predetermined height to rotate the first lens. The first reflective mirror 260, the second reflective mirror 260, the second lens FL2, and the fifth reflective mirror 280 to be tilted within the tilting effective range T, and then the second moving unit R2 and the third moving unit R3. By repeating the steps of moving each of the moving parts R3 up and down, precise fine pattern processing can be performed on the entire inner surface of the two objects 12-1 and 12-2 at the same time.

In addition, as in the second embodiment, since the path lengths of the first laser beam LS1 and the second laser beam LS2 are substantially the same, the inner surfaces of the two workpieces 12-1 and 12-2 are substantially the same. It is possible to perform precision fine pattern processing of the same quality.

Until now, only the drive part (not shown) demonstrates that the 2nd moving part R2 and the 3rd moving part R3 rotate and move up and down within the object 12-1 and the object 12-2. However, this is only an example and the present invention is not limited thereto, and a driving unit (not shown) may directly rotate and vertically rotate the object 12-1 and the object 12-2.

On the other hand, when the diameter of the object is larger than the distance between the first lens FL1 and the second lens FL2, pattern processing is performed using the second embodiment of the present invention, and each semi-diameter of the object is processed. When the sum is smaller than the distance between the third reflection mirror 260 and the fifth reflection mirror 280, it is preferable to perform pattern processing by the method of the third embodiment.

Therefore, in the present invention, it is preferable that the second embodiment and the third embodiment be implemented as one embodiment. When the second embodiment and the third embodiment are implemented as one embodiment, the pattern processing may be performed by appropriately selecting the moving parts R1, R2, and R3 according to the size of the object to be processed.

In other words, when the diameter of the object 12 is greater than the distance between the first lens FL1 and the second lens FL2, the first moving part R1 is moved within the object 12 to the beam splitter BS. The first axis AX1 is rotated about the center of the first reflection mirror 240 and the center of the first reflection mirror 240. In addition, when the sum of the respective semi-diameter of the object to be processed (12-1, 12-2) is smaller than the distance between the third reflection mirror 260 and the fifth reflection mirror 280, the second moving portion (R2) The third moving part R3 is rotated about the second axis AX2 connecting the center of the second reflection mirror 250 and the center of the third reflection mirror 260 in the object 12-1. The object 12-2 is rotated about a third axis AX3 connecting the center of the fourth reflective mirror 270 and the center of the fifth reflective mirror 280.

12 illustrates a process for generating a laser honing pattern on a cylinder block bore surface in accordance with one embodiment of the present invention.

R _z was used as a parameter indicating the roughness of the cylinder block bore surface. R _z can be expressed, for example, as the distance between two lines parallel to the centerline, passing from the highest peak of the roughness curve to the third peak and from the lowest to the third valley. have.

In step S10, rough honing processing using a grindstone or the like is primarily performed. R _z of the surface of the cylinder block bore after passing through the first step is, for example, 8 to 12 μm.

In step S20, the intermediate finishing honing process is performed secondarily. It can be seen that R _z of the surface of the cylinder block bore after passing through the second step is further refined to, for example, 2 to 15 µm.

In step S30, fine pattern processing is performed on the surface of the silicon block bore, which is the object to be processed 12, using the laser device according to one of the first to third embodiments. The laser processing apparatus can process fine oil grooves on the surface of the cylinder block bore to form a constant oil groove pattern.

It is preferable that the width | variety of an oil groove is 40-80 micrometers, and the depth is about 5-25 micrometers, for example.

In step S40, the final finishing honing process is performed. R _z of the surface of the cylinder block bore after passing through the fourth step is, for example, 1 to 2 μm.

Thus, the roughness of the silicon block bore surface is optimized by performing the honing process step by step, and by forming an oil groove on the silicon block bore surface using a laser processing apparatus, it is possible to provide an oil dish having a predetermined shape.

Those skilled in the art will appreciate that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and the equivalent concept are included in the scope of the present invention. Should be interpreted.

The laser processing apparatus according to the present invention as described above has the following effects.

First, by separating a single laser beam into a first laser beam (LS1) and a second laser beam (LS2) to process two parts at the same time, there is an effect that can reduce the work time required for laser processing.

Second, since the path length traveled by the first laser beam LS1 and the path traveled by the second laser beam LS2 are substantially the same, they are substantially the same as the first spot SP1 and the second spot SP2. Pattern processing of quality can be performed.

Third, since the user can select and rotate one of the first moving part R1 and the second and third moving parts R2 and R3 according to the size of the object to be processed, it can be applied to a processing object of various sizes. It has an effect.

Fourth, since the vertical movement of the entire moving part can be omitted by tilting and driving only the lens and the mirror, there is an effect that can simplify the motor drive for vertical movement of the moving part.

Claims (18)

In the dual laser processing apparatus, The apparatus comprises a laser light source, a beam splitter, a first reflective mirror, a second reflective mirror, a third reflective mirror, a fourth reflective mirror, a fifth reflective mirror, a first lens, a second lens and a driver, The laser light source unit generates a laser beam, The beam splitter splits the generated laser beam into a first laser beam and a second laser beam, The first laser beam proceeds sequentially to the first reflective mirror, the second reflective mirror, the third reflective mirror and the first lens. The second laser beam proceeds sequentially to the fourth reflective mirror, the fifth reflective mirror and the second lens, The first lens and the second lens is subjected to the pattern processing by injecting the first laser beam and the second laser beam to the inner surface of the object to be processed, The driving unit may include the beam splitter, the first reflection mirror, the second reflection mirror, the third reflection mirror, the fourth reflection mirror, the fifth reflection mirror, the first lens and the second lens. 1. A dual laser machining apparatus for moving a moving part within the object to be processed about a first axis connecting a center of the beam splitter and a center of the first reflection mirror. In the dual laser processing apparatus, The apparatus comprises a laser light source, a beam splitter, a first reflective mirror, a second reflective mirror, a third reflective mirror, a fourth reflective mirror, a fifth reflective mirror, a first lens, a second lens and a driver, The laser light source unit generates a laser beam, The beam splitter splits the generated laser beam into a first laser beam and a second laser beam, The first laser beam proceeds sequentially to the first reflective mirror, the second reflective mirror, the third reflective mirror and the first lens. The second laser beam proceeds sequentially to the fourth reflective mirror, the fifth reflective mirror and the second lens, The first lens and the second lens perform the pattern processing by injecting the first laser beam and the second laser beam into the inner surface of the first object and the second object, respectively, The driving unit may include a second moving unit including the second reflection mirror, the third reflection mirror, and the first lens with respect to a second axis connecting a center of the second reflection mirror and a center of the third reflection mirror. 1 Rotate in the object A third moving part including the fourth reflection mirror, the fifth reflection mirror, and the second lens, the second workpiece being about a third axis connecting the center of the fourth reflection mirror and the center of the fifth reflection mirror; Dual laser processing device that rotates within. The method of claim 1, Dual laser machining in which the path length of the first laser beam traveled from the beam splitter to the inner surface of the workpiece and the path length of the second laser beam traveling from the beam splitter to the inner surface of the workpiece are substantially equal. Device. The method of claim 2, The dual laser processing apparatus further comprising a drive unit for rotating the first and the second object to be processed. The method of claim 2, The dual laser processing apparatus further comprising a drive unit for vertically moving the first processing object and the second processing object. The method of claim 2, The dual laser processing apparatus further comprises a driving unit for vertically moving the second moving unit and the third moving unit. delete The method of claim 1, The dual laser processing apparatus further comprising a driving unit for vertically moving the first moving unit. The method according to claim 1 or 2, Located between the laser light source and the beam splitter, And a beam expander which controls the diameter of the laser beam generated by the laser light source unit and enters the beam splitter. The method according to claim 1 or 2, And wherein the first laser beam and the second laser beam are separated by 50:50 by the beam splitter. The method according to claim 1 or 2, And a sixth reflecting mirror disposed between the laser light source unit and the beam splitter to reflect the laser beam generated by the laser light source unit to advance to the beam splitter. The method of claim 9, The beam expander includes a first expander lens, a second expander lens, and a third expander lens, and the beam expander controls the diameter of the laser beam to thereby enter the inner surface of the object to be processed. Dual laser processing device to control the spot size of the. The method of claim 1, The dual laser processing apparatus further comprising a drive unit for rotating the object to be processed. The method of claim 1, The dual laser processing apparatus further comprising a drive unit for vertically moving the processing object. The method according to claim 1 or 2, And a tilting driver to tilt and drive the third reflection mirror and the first lens. The method of claim 15, And the tilting driver is configured to tilt the third reflection mirror and the first lens in a tilting effective range, and the tilting effective range is determined based on a depth of focus of the first lens. The method of claim 16, And the depth of focus is determined based on the effective diameter of the first laser beam, the lens constant of the first lens, and the wavelength of the first laser beam. In the method of honing the inner surface of a cylindrical workpiece, The first step of performing rough honing, A second step of performing an intermediate finishing honing process, A third step of performing laser microgroove using the dual laser processing apparatus according to claim 1 or 2; and  A honing machining method comprising the fourth step of performing a final finishing honing process.

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