WO2014017684A1

WO2014017684A1 - Laser-preheating machining apparatus

Info

Publication number: WO2014017684A1
Application number: PCT/KR2012/006018
Authority: WO
Inventors: 이춘만; 김동현; 김광선
Original assignee: 창원대학교 산학협력단
Priority date: 2012-07-27
Filing date: 2012-07-27
Publication date: 2014-01-30
Also published as: DE112012006740T5

Abstract

The present invention discloses a laser-preheating machining apparatus for machining a workpiece after softening a part to be machined of the workpiece by locally heating the part using laser generating modules capable of tilting and turning. According to the present invention, a milling machine is provided with two laser generating modules besides the spindle, which laser modules further have tilting and turning function so as to effectively irradiate the surface of the workpiece with laser beams, and to irradiate even an irregularly shaped workpiece with laser beams by means of the tilting and turning function of the laser generating modules prior to applying the milling machine.

Description

Laser preheating processing equipment

The present invention relates to a laser preheating processing device, and more particularly, to a laser preheating process of locally processing a softened part by locally heating a processed part of a material to be processed using a laser generating module having a tilting and rotating function. Relates to a device.

In general, workpieces made of materials such as titanium alloys have excellent characteristics such as heat insulation, high temperature strength, abrasion resistance and corrosion resistance, and thus are widely used in high-tech fields such as automobiles and aerospace. However, a workpiece made of such materials has a lot of difficulty in processing due to its high hardness and brittleness. In recent years, a multi-processing apparatus in which tools or equipment for cutting and processing a workpiece are integrated into the same apparatus. Research and development is underway.

Among them, research and development for incorporating laser technology are being actively conducted. For example, when processing a workpiece made of a difficult-to-cut material, the workpiece is heated and softened locally by using a laser heat source before cutting. Is more easily cut, and workability can be improved at the same time.

As a related art, Korean Patent Publication No. 10-0597907 (2006.6.30) is disclosed.

The disclosed patent discloses a temperature sensing means for sensing the temperature of the work piece 3, as shown in FIG. A laser generator 120 for generating a laser beam that can be irradiated onto the work piece 3; Cooling gas supply unit 130 for supplying a cooling gas for cooling the workpiece (3); One side focuses the laser beam generated by being connected to the laser generating unit 120 to the focusing lens, and is connected to the cooling gas supply unit 130 to focus the laser beam through the inlet formed on the side. Nozzles 125 for ejecting and ejecting each of the and the introduced cooling gas through the openings; The laser generating unit is electrically connected to the temperature sensing unit, the laser generating unit 120, and the cooling gas supply unit 130 to compare and determine the sensing temperature of the workpiece 3 sensed by the temperature sensing unit and the set temperature. The control unit 50 for controlling the 120 and the cooling gas supply unit 130 is configured to include.

The above-described registered patent having such a structure improves workability by preheating the workpiece by irradiating a laser beam to the cutting line point of the workpiece, and can easily machine a difficult-to-work workpiece. In addition, it is possible to implement a precise and rapid temperature control of the workpiece by sensing the temperature of the workpiece during processing in real time and selectively discharge the laser beam and the ejection of the cooling gas in accordance with the sensed temperature.

In addition, the cooling gas is ejected through the nozzle from which the laser beam is emitted, thereby enabling rapid cooling and local cooling, as well as the laser beam or the cooling gas through the nozzle located at the cutting point and the rear point of the workpiece. By selectively discharging and ejecting, it is possible to process and process various workpieces such as pre-heating of the workpiece, grinding after cutting, hardening, laser cutting of the workpiece, and the like.

However, the conventional patent disclosed as described above, the laser generating unit is provided separately from the cutting tool, there is a problem that it is difficult to constantly adjust the distance between the laser and the workpiece irradiated from the laser generating unit according to the shape of the workpiece. That is, it is difficult to constantly adjust the laser focus according to the shape of the workpiece, resulting in a problem of poor workability.

Accordingly, the present invention has been made to solve the above-mentioned problems, and an object thereof is to provide a laser preheating processing apparatus with a tilting and rotating function that can easily adjust the laser focus according to the shape of the material to be processed. have.

Another object of the present invention is to use a laser generation module with a tilting and rotating function to locally heat the softened part of the material to be processed and then proceed with the machining operation to improve workability through a more accurate laser focus function. The present invention provides a laser preheating apparatus.

According to the present invention for achieving the above object, the first and second joints having a working operation, and the first and second joints for irradiating the laser beam to the preheating portion of the workpiece to be processed in accordance with the movement 1 laser generating module unit; A third and fourth joint part capable of a working operation and installed to correspond to the first laser generating module to irradiate a laser beam to another preheated part of the workpiece according to the movement of the third and fourth joint parts; 2 laser generating module unit; And classifying the material to be processed into a first work area and a second work area, wherein the first work area is laser preheated by a first laser generation module, and the second work area is a second laser generation. It provides a laser preheating processing apparatus comprising a; control unit for controlling the laser preheating operation by the module unit.

In addition, the first and third joints may perform a tilting operation in the front and rear or left and right directions, and the second and fourth joints may perform a rotational operation in the horizontal direction.

In addition, upper ends of the first, second, third and fourth joint parts may be fixed to the ceiling, respectively.

In addition, the working angle of the tilting angle of the first and third joints is 180 degrees, and the first and second working regions may be determined in consideration of the tilting angles of the first and third joints.

In addition, lower ends of the first, second, third and fourth joint parts may be fixed to the bottom surface, respectively.

In addition, the controller may individually control the tilting and rotating operations of the first, second, third and fourth joint parts.

As described above, according to the present invention, the laser beam can be efficiently irradiated onto the surface of the material to be processed by adding a tilting and rotating function to the laser generating module while two laser generating modules are installed separately from the spindle of the milling machine. In addition, there is an effect that the laser beam can be irradiated prior to the milling machine through the tilting and rotating functions of the laser generating module even in a material of a complex shape.

1 is a schematic configuration diagram showing a workpiece processing apparatus using a conventional laser beam;

2 is a block diagram of a laser preheating apparatus according to the present invention;

3a and 3b is a schematic configuration diagram of a laser preheating processing apparatus according to the present invention,

4a to 4c is a view showing a tilting operation process of the laser preheating processing apparatus according to an embodiment of the present invention,

5 is a schematic configuration diagram of a laser preheating apparatus according to another embodiment of the present invention.

The terms or words used in this specification and claims are not to be construed as limiting in their usual or dictionary meanings, and the inventors may properly define the concept of terms in order to best explain their invention in the best way possible. It should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Hereinafter, the present invention configured as described above will be described in detail with reference to the accompanying drawings.

2 is a block diagram of a laser preheating apparatus according to the present invention, and FIGS. 3A and 3B are schematic diagrams of a laser preheating apparatus according to the present invention. 4A to 4C are views illustrating a tilting operation of the laser preheating apparatus according to the embodiment of the present invention, and FIG. 5 is a schematic configuration diagram of the laser preheating apparatus according to another embodiment of the present invention.

As shown in FIG. 2, the laser preheating apparatus of the present invention includes a laser oscillation unit 12; Control unit 14; A first laser generation module unit 20 having a first joint part 22 and a second joint part 24; And a second laser generation module unit 30 having a third joint portion 32 and a fourth joint portion 34.

That is, as shown in Figure 3a and 3b, the present invention is such that the first laser generating module 20 and the second laser generating module 30 corresponding to the milling machine (1) of the machine tool, respectively It is installed.

Here, the milling machine 1 of the machine tool, the spindle is the main axis of the work to cut the workpiece 10 using the milling cutter in accordance with the movement of the main axis, such a configuration is well known Since it is almost the same as a conventional milling machine, a detailed description thereof will be omitted.

At this time, the material to be processed 10 is made of any one of titanium alloy, superalloy, tungsten, ceramic, composite material.

In addition, the laser oscillation unit 12 is a laser oscillation device for irradiating a laser beam under the control of the control unit 14, the laser is a laser including a solid laser, liquid laser, die laser, gas laser, semiconductor laser, Ultrashort pulsed laser or the like may be applied.

In particular, the laser used in the laser processing of the present invention can be applied to a diode laser, LD-excited YAG laser, CO2 laser, fiber laser, excimer laser, ultrashort pulse laser and the like.

The above laser processing technology uses a principle of condensing high power laser light in a very small area to obtain a large energy density to heat, melt and evaporate a material, thus free cutting, drilling, marking, trimming, Welding, surface treatment, micromachining can be variously processed.

The controller 14 controls the tilting and rotation operations of the first to fourth

joint parts

22, 24, 32, and 34, and controls the first and second laser

generation module parts

20 and 30. Depending on the working radius, the laser preheating work is controlled by individual movements.

That is, the controller 14 divides the material 10 to be processed into a first work area and a second work area, and the first work area is laser preheated by the first laser generation module unit 20. In progress, the second working region controls the laser preheating operation by the second laser generation module unit 30.

The first laser generating module unit 20 includes first and second

joint parts

22 and 24 capable of working, and is processed according to movement of the first and second

joint parts

22 and 24. The laser beam is irradiated onto the preheated part of the material 10.

That is, in order to easily adjust the laser focus according to the shape of the material to be processed (10), it has a tilting and rotating function, and the processing part of the material to be processed is first and second joint portions ( The preheating operation is performed to locally heat through the movement of 22) (24).

The second laser generating module unit 30 includes third and

fourth joint parts

32 and 34 capable of working, and is installed to correspond to the first laser generating module unit 20. As the

fourth joints

32 and 34 move, the laser beam is irradiated to other preheated portions of the workpiece 10.

That is, it has a tilting and rotating function and is installed so as to correspond to the first laser generating module unit 20 so that the third and fourth

joint parts

32 and 34 may be moved to move the other material of the processing target material 10. A preheating operation is carried out to locally heat the workpiece.

The first and third

joint parts

22 and 32 serve as tilting in the front and rear or left and right directions, and the second and fourth

joint parts

24 and 34 serve to rotate in the horizontal direction.

In this case, the reason for the laser preheating operation is that when processing the portion of the workpiece 10 made of a difficult material, locally preheated the machining portion of the workpiece 10 using a laser heat source before milling. When softened by the workpiece 10, that is, the workpiece can be more easily cut, the workability is also improved.

The basic configuration of the first laser generating module unit 20 and the second laser generating module unit 30 is composed of a laser medium, a pumping unit and a switching unit to output a laser beam having a predetermined pulse width. Since the configuration is similar to that of a well-known conventional laser device, a detailed description thereof will be omitted.

In this case, the laser beams oscillated by the first and second laser

generation module units

20 and 30 are ultra-short laser pulses having a pulse width in femto-second or pico-second units. It may be.

By using a laser beam having such ultrashort pulses, the pulse duration is shorter than the thermal diffusion time and there is no energy transfer between the electrons and the lattice, so that the target exposed to the laser beam can be removed in a short time with high energy intensity.

As a result, a melting zone or a heat affected zone is hardly observed in the portion to which the laser beam is irradiated. In addition, the length of the laser pulse absorbed and diffused in any material is proportional to the width of the laser pulse, so that the extremely short laser pulse has a short duration, and the diffusion length of the laser pulse absorbed and diffused into the object is also short. It is possible to achieve precision machining.

3A and 3B,

upper end portions

26 and 36 of the joint portion of the first laser generation module 20 and the second laser generation module 30 are fixed to the ceiling, respectively. This is to facilitate a machining operation and to secure a wide working environment of the first and second

laser generation modules

20 and 30. Preferably, as shown in FIG. 3b, the joint part of the second laser generating module part 30 and the upper end of the milling device 1 of the machine tool may be fixedly installed on the ceiling.

In addition, the working radiuses of the tilting angles of the first and second laser

generation module units

20 and 30 are each within a range of 180 degrees. That is, the working angles of the tilting angles of the first or second laser generating

module parts

20 and 30 are each within a range of 180 degrees, but in the case of three laser generating module parts of the processing apparatus according to the present invention, the range is 90 degrees. Can be decided.

As in the preferred embodiment of the present invention, the first and second laser generating

module units

20 and 30 are installed in two, and the reason for the processing is to improve the efficiency of the work.

That is, when two laser generating module parts are two, the work efficiency is improved. This is because two laser generating modules can be used to cross the machining operation. If the first laser generating module unit 20 performs the forward work to the first working area, the second laser generating module unit 30 may perform the latter work to the second working area at the same time, and thus the efficiency of the work. This can be improved.

When the first laser generating module unit 20 or the second laser generating module unit 30 is fixed, the laser

generating module unit

20 or 30 moves in the processing direction or the moving direction of the processing device 1 of the machine tool. It is possible to move.

The connecting end of the first laser generation module unit 20 is composed of a first joint (tilting) 22 or a second joint (rotation) 24, as shown in Figure 4a. That is, in order to facilitate the machining operation according to the type of the material to be processed 10, the first joint part (tilting on one axis) 22 or the second joint part (two axes on the rotation) 24 may be selected and applied. .

In addition, the connecting end of the second laser generation module 30 is composed of a first joint (tilting) 32 or a second joint (rotation) 34 as shown in Figure 4b and 4c. That is, in order to facilitate the machining operation according to the type of the material to be processed 10, the first joint part (tilting on one axis) 32 or the second joint part (rotating on two axes) 34 may be applied. . For example, as shown in FIG. 3A, when the material 10 to be processed is difficult to round, the third and fourth

joint parts

32 and 34 of the second laser generating module part 30, that is, the axial tilting function and If it consists of a two-axis rotation function, the working process of the material to be processed 10 can be made easier.

As another embodiment of the present invention, as shown in FIG. 5, the joint part of the second laser generating module part 30 may be fixedly installed on the bottom surface of the lower part 38 instead of the upper part 36. That is, the lower end 38 of the joint portion of the second laser generating module unit 30 is fixed to the bottom surface of the milling machine 1 of the machine tool, thereby being installed according to the shape or working environment of the material to be processed 10. By changing the position, it can be preheated or machined.

That is, the upper end 36 or the lower end 38 of the joint part of the second laser generating module unit 30 may be selectively disposed on the ceiling or the bottom surface in accordance with the shape or the working environment of the material to be processed 10. It is obvious that it can be fixed.

Next, the operation of the laser preheating apparatus according to the present invention will be described.

First, when processing the material to be processed 10 of the round shape as shown in Figure 3a is to preheat the laser before milling operation of the milling machine (1).

That is, before the milling process proceeds, if the processing portion of the workpiece 10 is locally preheated and softened by using a laser heat source before cutting, the workpiece 10 may be more easily cut.

As shown in FIG. 4A, the first and second

joint parts

22 and 24 of the first laser generation module 20 are configured to easily adjust the laser focus according to the shape of the material to be processed 10. Preheating is performed to locally heat the processing portion of the workpiece 10 using the tilting and rotating functions through the movement of the first and second

joint portions

22 and 24.

4B and 4C, the first and second

joint parts

32 and 34 of the second laser generating module part 30 facilitate laser focusing according to the shape of the material to be processed 10. Preheating is performed to locally heat the processing part of the workpiece 10 by moving the first and second

joint parts

32 and 34 by using a tilting and rotation function for adjusting the same.

In other words, the tilting or rotating function added to the second laser generating module unit 30 while the upper end 36 or the lower end 38 of the joint portion of the second laser generating module unit 30 is installed to be fixed to the ceiling or the bottom surface. According to the movement of the laser beam can be efficiently irradiated to the surface of the material to be processed (10).

Therefore, the laser preheating apparatus of the present invention is installed in a state in which the upper end or the lower end of the joints of the two first and second laser generating

module parts

20 and 30 separate from the spindle of the milling machine is fixed to the ceiling or the bottom surface. According to the tilting or rotational movements added to the first and second laser

generation module units

20 and 30, the laser beam can be efficiently focused on the surface of the workpiece.

While specific embodiments of the present invention have been described and illustrated above, it will be apparent that the present invention may be embodied in various modifications by those skilled in the art. Such modified embodiments should not be understood individually from the technical spirit or the prospect of the present invention, but should fall within the claims appended to the present invention.

The laser preheating apparatus of the present invention adds a tilting and rotating function to the laser generating module, respectively, in a state where the upper or lower ends of two joints of the laser generating module are separately fixed to the ceiling or the bottom surface separately from the spindle of the milling machine. In order to efficiently irradiate the laser beam to the surface of the material to be processed according to the movement of the tilting and rotating functions, the workpiece made of materials such as titanium alloy by the laser preheating processing device of the present invention has heat insulation, high temperature strength, and abrasion resistance. And excellent characteristics such as corrosion resistance can be widely used in the high-tech field such as automobile, aerospace and the like.

Claims

A first laser generation module unit having first and second joints capable of working and irradiating a laser beam to a preheated portion of a workpiece to be processed according to movement of the first and second joints;

A third and fourth joint part capable of a working operation and installed to correspond to the first laser generating module to irradiate a laser beam to another preheated part of the workpiece according to the movement of the third and fourth joint parts; 2 laser generating module unit; And

The material to be processed is divided into a first work area and a second work area, wherein the first work area is laser preheated by a first laser generation module, and the second work area is a second laser generation module. A control unit controlling the laser preheating operation by the unit; Laser preheating apparatus, characterized in that configured to include.
The method of claim 1,

The first and the third joint portion laser preheating apparatus, characterized in that the tilting operation in the front and rear or left and right directions.
The method of claim 1,

And the second and fourth joint parts rotate in a horizontal direction.
The method of claim 1,

Laser preheating apparatus, characterized in that the upper end of the first, second, third and fourth joint portion is fixed to the ceiling, respectively.
The method of claim 2,

The tilting angle working radius of the first and third joints are 180 degrees, respectively.
The method of claim 2,

Laser preheating apparatus, characterized in that the first and second working area is determined in consideration of the tilting angle of the first and third joints.
The method of claim 1,

Laser preheating apparatus, characterized in that the lower end of the first, second, third and fourth joint portion is fixed to the bottom surface, respectively.
The method of claim 1,

The control unit is a laser preheating processing apparatus, characterized in that for individually controlling the tilting and rotation of the first, second, third and fourth joint portion.