KR100842888B1 - Spool Heater and Heat Treatment Method Using Diode Laser - Google Patents

Abstract

A spool heat treatment machine and a heat treatment method using diode lasers are provided to increase heat treatment efficiency by measuring an optimal laser focal distance, create a pleasant working environment by sucking smoke and alien substances generated during the heat treatment, and minimize the defective proportion through the straightness inspection. A spool heat treatment machine(100) using diode lasers comprises: a supply part(10) having a supply support(12) connected thereto and moved vertically such that a workpiece(200) rolled down along an inclined table(11) is simultaneously placed and floated on the supply support; a bed(20) which is connected to the supply part to receive the workpiece, and on which a reciprocating main bed(21) is placed; a tailstock(30) installed on the main bed of the bed to support one end of the workpiece; a rotary headstock(40) which is installed oppositely to the tailstock to support the other end of the workpiece, and which is rotationally driven; a straightness inspecting part positioned between the tailstock and the rotary headstock to inspect straightness of a supplied workpiece; a pair of laser oscillating parts(60) positioned between the tailstock and the rotary headstock and installed on the bed oppositely to each other to heat-treat a surface of the workpiece in the form of a lattice by irradiating diode laser beams onto the workpiece in a state that the workpiece is divided into two parts; a suction part(70) installed above the laser oscillating parts to suck smoke and alien substances generated during the heat treatment; and a discharge part including a discharge support on which a surface heat treatment-completed workpiece(300) is placed, and which is formed on an inner side of an inclined table and moved vertically to discharge the surface heat treatment-completed workpiece by a rolling operation after floating the surface heat treatment-completed workpiece.

Description

Spool heat treatment machine and heat treatment method using diode laser {Spool Heat Treatment machine and Heat Treatment method for Diode Laser}

Figure 1a is a perspective view of a conventional laser heat treatment apparatus,

Figure 1b is a schematic diagram irradiating using one laser oscillation unit according to the prior art,

Figure 1c is a graph showing the relationship between the heat treatment depth and hardness according to the prior art,

2 to 4 is a schematic view showing a side view, a plan view, a front view of a diode laser heat treatment machine according to the present invention,

5 is a schematic diagram of a workpiece mounted on the diode laser heat treatment device according to the present invention;

6 is a schematic view showing a moving means according to the present invention;

7A and 7B are a schematic view of calculating a laser focal length and a laser irradiation state according to the present invention;

8 is a schematic view of a state of measuring the straightness and the initial position according to the invention,

9A and 9B are schematic diagrams for irradiating a laser to a workpiece using a pair of laser oscillators according to the present invention, and a graph showing a relationship between heat treatment depth and hardness;

10 is a flowchart of a heat treatment method according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10 supply unit 11 inclination table

12: supply support 20: bed

21: main bed 21a: forward and backward motor

30: tailstock 31: tailstock motor

40: rotating spindle 41: non-contact position detection sensor

50: straightness inspection unit 51: non-contact distance sensor

60: laser oscillation unit 61: jig

61a: support end 61b: laser irradiation surface

62: non-contact temperature sensor

70: suction part 80: discharge part

81: discharge support 82: inclined table

90: conveying means 91: loading bed

92; First loader 93: supply chamber

94: second loader 95: discharge chamber

100: heat treatment machine R1, R2: straightness distance

L: Laser Focal Length

S1: Focus distance calculation step S2: Supply step

S3: Origin check step S4: R1 = R2 discrimination step

S5: heat treatment and bad discharge step S51: temperature measurement step

S6: Suction unit operation stage S7: Discharge stage

The present invention relates to a spool heat treatment machine using a laser, and in particular, a pair of high-power diode lasers can be used to perform heat treatment for surface hardening without melting, to increase the efficiency of heat treatment by measuring an optimal laser focal length, The present invention relates to a spool heat treatment machine and a heat treatment method using a diode laser in which smoke and foreign substances generated during heat treatment are inhaled to create a pleasant working environment and the defect occurrence rate is minimized through a straightness test.

     In general, one of the key components of the hydraulic control valve is the spool, which is a high precision part whose cylindricality must be within 10 μm in terms of geometry, and in terms of product characteristics, millions of operating cycle times are required to control the hydraulic circuit. There is this. Therefore, in order to satisfy these characteristics, the surface hardening process is required to improve the wear resistance of the spool, which is the most important characteristic. To this end, a carburizing heat treatment and a hard chromium plating process are adopted as production processes.

However, due to this production process, the deformation of the spool is caused by thermal deformation after carburizing heat treatment, causing a sticking phenomenon during operation, and thus a correction process of the heat deformation portion after heat treatment (press process). There is a problem in that the deformation of heat is caused by residual stress after correction and grinding.

In addition, the hard chromium plated product has a problem in that the plating thickness is about 30 to 40 μm and plating flowers are generated or partially thickly plated at end and end portions, thereby adversely affecting precision.

The recent heat treatment method is roughing and finishing in the grinding process after carburizing heat treatment or hard chromium plating, but this does not satisfy the cylindricalness due to the removal of the residual strain stress generated by the modification process, or the hard chromium plating layer is removed. have.

For this reason, a technique for surface hardening while preventing deformation by a carburizing heat treatment or a hard chromium plating process is required, which can be solved by performing surface heat treatment using a laser.

In addition, in order to measure the amount of bending and thermal deformation of the carburized heat treatment during the conventional carburizing heat treatment, the total number of workpieces subjected to carburizing heat treatment was measured.

At this time, the laser surface heat treatment is possible local treatment, there is no heat deformation due to the heat treatment of the product, the processing speed is faster than the conventional heat treatment technology, there is an advantage to increase the wear characteristics and increase the durability.

In particular, hydraulic systems used in heavy equipment such as excavators that surface harden using laser heat treatment are characterized by having millions of operating cycle times under high pressure in order to control hydraulic circuits in terms of product characteristics. In addition, during millions of operating cycle times, there should be no oil leakage or leakage due to surface wear.

To satisfy this, parts such as valve spools used in excavator hydraulic systems must have a hardness greater than a certain depth from the surface.

This laser heat treatment is in principle the same as other heat treatment methods in that it changes the mechanical properties of the steel through heating and cooling.

However, when a heat source called a laser beam is heated to the austenite formation temperature by rapidly heating the material only on the surface by a skin effect, and there is no longer a laser energy source due to turning off the laser or moving the material. There is a big difference in that it cools itself rapidly due to the conduction into the material rather than other effects.

By the laser heat treatment in this manner, the valve spool used in the hydraulic system of the excavator is heat treated intermittently (lattice-shaped) or continuously (band-shaped) rather than heat-treating the entire surface.

That is, the valve spool may be divided into a heat treatment portion and an unheat treatment portion. In the heat treatment of the valve spool by the laser beam, the part for opening and closing the valve port is heat-treated in the entire circumference, but the other parts are heat-treated in the form of a lattice. The heat treatment depth of the valve spool by the laser beam has a depth of approximately 0.6 to 0.7 mm, and the size of the grating is 2 × 2 mm and 3 × 3 mm.

As such, for the heat treatment of the spool has been proposed as Korean Patent Application Publication No. 10-2007-51513 filed by the applicant.

A typical example of such a conventional laser heat treatment apparatus is shown in FIGS. 1A-1B.

The conventional laser heat treatment apparatus as described above includes a bed (1) in which the control device and the measurement device are accommodated; A support (2) installed at one side of the bed (1) to support one side of the workpiece 200 having a circular rod shape; A rotating spindle (3) installed on the other side of the bed (1) to face the support (2), supporting the other side of the workpiece (200), and being rotationally driven; And a workpiece 200 that moves along the longitudinal direction of the bed 1 between the support 2 and the rotation spindle 3, and is supported and rotated by the support 2 and the rotation spindle 3. A laser oscillation unit 4 on which a laser is installed to heat-treat) into a lattice shape; The laser oscillation unit 4 is operated by repeatedly irradiating and stopping the irradiation of the laser beam a predetermined number of times for a predetermined time at a temperature below the melting temperature for one heat treatment point while the workpiece 200 rotates. The workpiece 200 is characterized in that configured to be heat treated.

Firstly irradiating a laser beam at a temperature below a melting temperature with respect to the first heat treatment point of the first section in the circumferential direction of the circular rod-shaped workpiece 200 as described above; After the laser beam irradiation of the laser beam is stopped, the irradiation of the laser beam is stopped for a time shorter than the first laser beam irradiation time, and then, in the same manner as the first laser beam irradiation step, the laser beam is moved to the next heat treatment point. Investigating; After the irradiation of the laser beam is stopped for a time as much as the stop time, the process is repeated a predetermined number of times for the first and the next heat treatment points at the same temperature during the first laser beam irradiation.

However, the conventional laser heat treatment apparatus shows the same hardness at each point as the heat treatment is performed using one laser oscillator, but there is a problem that the hardness is changed as the heat treatment depth is increased.

The graph shown in Figure 1c shows the result of measuring the hardness after the heat treatment at three points # 1, # 2, # 3 divided into three circumference of the workpiece.

That is, in the conventional laser heat treatment apparatus, as the heat treatment is performed by using one laser oscillation part, the surface of each point has the same hardness distribution, but the depth of heat treatment at the start and end of the heat treatment is affected by the effect of heat conduction during the laser heat treatment. This results in a graph showing different heat treatment depths.

Due to this, the laser-heat-treated spool has a problem of uneven wear by initially having a normal hardness but having different hardness distribution of the wear surface as the surface is worn.

In addition, there is a problem in that the operation of the spool is reduced due to uneven wear, and at the same time, a phenomenon such as sticking occurs during operation.

In addition, the defects of the workpieces were visually checked and the defective products were selected. However, the fine straightness requiring the precision could not be checked with the naked eye. When installed for operation, there was a problem in that operability was degraded or uneven wear occurred.

 However, since the bending due to thermal deformation, which is the advantage of laser heat treatment, does not occur, the correction process for the warpage of the workpiece is not necessary. However, if there is a warpage deformation of the workpiece before the heat treatment, the warpage cannot be measured. I had a problem.

In addition, the surface heat treatment is performed in a state in which the workpieces in the defective state are not selected, resulting in a waste of energy for oscillating unnecessary lasers, and at the same time, an unnecessary work process is performed, resulting in a huge loss in productivity.

In addition, when the workpiece is positioned for the surface heat treatment, the initial position may not be set correctly, and there is a problem in that an error phenomenon is performed at a portion other than the surface heat treatment portion.

In addition, if the position of the workpiece to the laser heat treatment site is not set correctly during the laser heat treatment, the notch having a relatively small heat treatment surface area and the melting of the surface due to the concentration of the laser energy occur near the end of the spool. It had a problem of causing deformation in the product due to melting of the workpiece surface.

If the distance between the heat-treated workpiece and the laser oscillator cannot be accurately calculated during the laser heat treatment, the concentration of the laser beam is deviated from the heat treatment surface, thereby failing to obtain a heat treatment effect due to a decrease in thermal energy, or melting of the surface due to excessive energy concentration. Problem occurs.

In addition, there is a problem that the working space is contaminated due to the smoke and foreign substances generated during the surface heat treatment, thereby preventing damage to the laser oscillation unit and creating a comfortable space.

Due to this, shortening of working time and minimizing melting and thermal deformation, automatic supply and discharge operation, creating a pleasant working space, and identifying / selecting defects of work materials, generating unnecessary energy consumption or working process The heat treatment device using the laser which can obtain the high efficiency heat treatment effect by calculating the initial position and calculating the initial position and calculating the optimum irradiation distance of the laser can be obtained.

Accordingly, the present invention has been made in view of the problems of the prior art as described above. By shortening the surface heat treatment process by dividing the area of the workpiece rotating the laser irradiated from a pair of high power diode laser oscillation parts, the heat treatment time is shortened and the heat treatment depth is reduced. An object of the present invention is to provide a spool heat treatment apparatus using a diode laser to have an even distribution of.

Further, another object of the present invention is to form an inclined table of the supply portion and the discharge portion to facilitate the supply of the workpiece, and to facilitate the discharge of the workpiece.

In addition, another object of the present invention is to examine the straightness of the workpiece to screen the defective workpiece can not only minimize the occurrence rate of the defective workpiece, but also does not perform a surface heat treatment operation for the defective workpiece The purpose is to shorten the working time and prevent wasteful elements necessary for unnecessary work processes.

In addition, another object of the present invention is to be able to set the exact initial position of the workpiece using a non-contact position sensor to ensure that the heat treatment position is accurate.

In addition, another object of the present invention is to measure the surface temperature change of the workpiece to be irradiated with a laser irradiated using a non-contact temperature sensor to achieve a uniform heat treatment.

As well as. Another object of the present invention is to inhale smoke and foreign substances generated during heat treatment using the suction unit to create a pleasant working environment, and to prevent foreign substances from being deposited on the workpiece and the laser oscillation unit.

In order to achieve the above object, the present invention is a workpiece that is rolled along the inclined table and at the same time the supply portion coupled to the support support to be moved up and down, and

A bed which is connected to the supply part and receives a workpiece, and a main bed for reciprocating is placed;

A tailstock installed on the main bed to support one end of the workpiece,

A rotating spindle installed on the opposite side of the tailstock to support the other end of the workpiece,

Located between the tailstock and the rotating spindle, the straightness inspection unit for checking the straightness of the supplied workpiece,

It is located between the tailstock and the rotating spindle, a pair of laser oscillation unit facing the bed for dividing the workpiece and irradiating the diode laser to the surface heat treatment in a lattice shape,

The upper portion of the laser oscillation portion and the suction portion for sucking smoke and foreign substances generated during heat treatment;

A discharge support formed on the inside of the inclined table is provided with a discharge support which is moved up and down to be discharged by the rolling action while supporting the finished workpiece after the surface heat treatment is completed; Selecting a defect of the workpiece to reduce the processing cost, characterized in that configured to shorten the time of the surface heat treatment.

And the straightness inspection part comprises a pair of non-contact type distance sensors facing each other to irradiate a laser from the outside of the bed to irradiate the central portion of the workpiece; When the workpiece is rotated while being supported on the tailstock and the rotating spindle, the straightness distance irradiated by the non-contact distance sensor is configured to determine the straightness according to the match or inconsistency.

In addition, in order to calculate the optimum focal length of the laser oscillator, it is characterized in that it is composed of a jig that is irradiated with the laser from the laser oscillator fixed to the bed while moving in a state supported so as not to rotate on the tailstock and the rotating spindle.

The jig has a support end formed at both ends to be supported by the tailstock and the rotating headstock, and extends inwardly of the support end and is composed of laser irradiation surfaces formed at both sides of the vertex, which is raised in a trapezoid shape. It features.

In addition, a non-contact temperature sensor for measuring the temperature of the laser is formed on one side of the laser oscillator; It is characterized in that it is configured to measure the surface temperature of the workpiece to be irradiated with laser during the surface heat treatment.

In addition, the one side of the rotary headstock is characterized in that it is composed of a non-contact position detection sensor that can be coupled to the bed to be located in the correct position of the workpiece.

In addition, picking up the workpiece supported by the supply support by moving up and down along the first loader reciprocating along the loading bed located at the upper part between the supply portion supplied with the workpiece and the discharge portion for discharging the workpiece And a supply chamber for placing the workpiece between the rotary spindles,

A transport means positioned in the center of the loading bed and moving along a second reciprocating second loader and formed into a discharge chamber for picking up the workpiece supported between the tailstock and the rotating spindle and placing it in the discharge support; The supply chamber is moved downward to pick up the workpiece, and the discharge chamber picks up the workpiece to provide a spool heat treatment device using a diode laser, characterized in that the supply and discharge are respectively made at the same time.

Looking at the method of surface heat treatment of the workpiece using the heat treatment machine as described above.

A focal length calculation step of calculating a laser focal length of the laser oscillation part for adjusting the distance between the workpiece and the laser oscillation part before laser heat treatment;

After the focal length calculation step, the supply chamber moves the workpiece placed in the supply support to be positioned between the tailstock and the rotating spindle,

After the supplying step, the origin check step for determining the accuracy of the initial position of the workpiece in order to heat treatment at the correct position by the non-contact position detection sensor,

After the origin check step, check the coincidence and inconsistency of the straightness distance obtained by irradiating the laser from the non-contact distance sensor to the central part of the workpiece to be rotated together by the rotation of the rotating spindle. R1 = R2 determination step of determining the straightness by rejection,

After passing through the straightness test, if it passes, the laser beam is irradiated with the diode laser from the laser oscillation unit. If the workpiece is rejected, heat treatment is performed through the discharge support and the inclined table by the discharge chamber. Bad discharge stage,

It is made at the same time as the heat treatment and bad discharge step, when performing the heat treatment of the workpiece to be passed, the suction part operation step of operating the suction part for removing the smoke and foreign substances generated during the heat treatment,

The suction part operation step is continuously performed, and after the heat treatment and bad discharge step, the finished material after surface heat treatment is picked up by the discharge chamber and discharged to the discharge part through the discharge support and the inclined table and moved along the inclined table. It is characterized by consisting of a supply and discharge step of picking up the workpiece placed in the support to the supply chamber and positioned between the tailstock and the rotating headstock.

In addition, the heat treatment and poor discharge step using a diode laser, characterized in that further comprising a temperature measuring step for measuring the surface temperature of the workpiece to be irradiated with the laser irradiated from the laser oscillation unit using a non-contact temperature sensor Provided a spool heat treatment method.

As described above, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 to 4 are schematic views showing a side view, a plan view, and a front view of a diode laser heat treatment machine according to the present invention. FIG. 5 is a schematic view showing a workpiece mounted on the diode laser heat treatment machine according to the present invention. Figure 7a and Figure 7b is a schematic diagram showing a moving means according to the invention is a schematic view of calculating the laser focal length and the laser irradiation state according to the present invention, Figure 8 is a straightness and the initial position according to the present invention is measured 9A and 9B are graphs showing a schematic diagram of irradiating a workpiece with a laser using a pair of laser oscillators and a relationship between heat treatment depth and hardness, and FIG. Flow chart of the heat treatment method according to.

As shown in the drawing, the spool heat treatment apparatus using the diode laser of the present invention is coupled to the supply unit 12, which is supported while the workpiece 200 rolled along the inclination table 11 is moved up and down to support the support ( 10) is configured.

The supply part 10 is formed to be lowered as it goes inward with respect to the outside of the inclination table 11 when projecting from the front.

Then, the supply support 12 is moved in the vertical direction by the pneumatic operation, the workpiece 200 is rolled along the inclined table 11, the upper portion is formed in a 'U' shape to be settled, the inclined table 11 It is configured such that the length of the vertical stand located on the side is short.

In addition, the bed 20 is configured to be connected to the supply unit 10 receives the workpiece 200, and the main bed 21 to reciprocate is placed.

Here, the bed 20 is a fixed frame shape, the main bed 21 is placed so as to slide on the upper portion while moving the workpiece 200 in the longitudinal direction of the bed 20 by the forward and backward motor 21a. Move it.

In addition, the front side of the bed 20 is provided with a controller 22 that is responsible for the supply and shutdown of power, control, determination of abnormality, emergency stop, control of various sensors and driving devices.

At this time, the tailstock 30 is installed on the main bed 21 and supports one end of the workpiece 200.

The tailstock 30 has a conical shape to support one end of the workpiece 200, and is moved by the tailstock motor 31 to perform a reciprocating movement back and forth along the length of the workpiece 200 to be processed. It is formed to support 200).

On the other hand, it is provided on the opposite side of the tailstock 30 is configured to support the other end of the workpiece 200, the rotary headstock 40 to rotate the drive.

That is, the rotating headstock 40 is rotated by receiving the driving force by the driving motor 42, unlike the tailstock 30, and is of the form of a chuck (Check) to bite the other end of the workpiece 200. , The workpiece 200 is configured to rotate so that the laser can be irradiated.

Then, one side of the rotating headstock 40 is coupled to the bed 20 is configured a non-contact position detection sensor 41 that can be confirmed that it is located in the correct position of the workpiece 200.

In addition, the tailstock 30 and the rotating headstock 40 is fixed to the upper portion of the main bed 21 is configured to move together in accordance with the movement of the main bed 21 by the operation of the forward and backward motor 21a.

On the other hand, the non-contact position detection sensor 41 checks the position so that the laser can be accurately irradiated to the portion requiring surface heat treatment by determining whether the initial position of the workpiece 200 is received from the supply unit 10 is correct will be.

In addition, located between the tailstock 30, the rotary headstock 40, the straightness inspection unit 50 for checking the straightness of the supplied workpiece 200 is configured.

At this time, the straightness inspection unit 50 is formed of a pair of non-contact distance sensor 51 fixed to the bed 20 to face the laser to the central portion of the workpiece 200.

That is, each of the irradiated from the pair of non-contact type distance sensor 51 when the rotating headstock 40 is rotated while the workpiece 200 is supported on the tailstock 30 and the rotating headstock 40 Straightness distance (R1, R2) is to determine the straightness according to the match or inconsistency.

And, it is located between the tailstock 30, the rotary headstock 40, and fixed to face the bed 20 for irradiating a diode laser to the surface dividing the workpiece 200, the surface heat treatment in a lattice shape A pair of laser oscillation unit 60 is provided.

The laser oscillation unit 60 is a device for irradiating a high-power diode laser. The laser oscillation unit 60 is intended to shorten the heat treatment time and to uniform the heat treatment depth by dividing and heat treating the workpiece 200 into two sections. .

At this time, the laser irradiated from the laser oscillator 60 is configured with a jig 61 to calculate the optimal focal length.

That is, the jig 61 receives the laser from the laser oscillation unit 60 fixed to the bed 20 while being supported so as not to rotate on the tailstock 30 and the rotating headstock 40 to calculate the laser optimum focal length. Will be investigated.

In detail, the jig 61 has support ends 61a formed at both ends of the jig 61 so as to be supported by the tailstock 30 and the rotation headstock 40. The jig 61 extends inward of the support end 61a and is raised in a trapezoidal shape. It consists of the laser irradiation surface 61b formed in the both sides on the basis of the vertex made.

In addition, the non-contact temperature sensor 62 for measuring the surface temperature of the workpiece 200 irradiated with the laser is fixed to the bed 20 on one side of the laser oscillation unit 60.

The non-contact temperature sensor 62 measures the surface temperature of the workpiece 200 to be irradiated with the laser during surface heat treatment, so that melting of the workpiece may occur when the surface temperature rises above the melting point. Measured using the temperature sensor 62 to adjust the laser irradiation intensity upon excessive rise of the surface to prevent melting of the surface.

In addition, the upper portion of the laser oscillation unit 60 is configured with a suction unit 70 for sucking the smoke and foreign substances generated during the heat treatment.

That is, the suction unit 70 is formed in a duct shape, and is configured to be connected to a suction device such as a fan to suck.

In addition, the discharge portion 80 is formed on the inside of the inclined table 82, the discharge support 81 is moved up and down so that the surface 300 is completed, while the workpiece 300 is completed by the surface heat treatment.

At this time, the discharge support 81 is operated in the same function as the supply support 12, the upper portion is formed in the 'U' shape so that the workpiece 200 is settled, the length of the vertical table located on the inclined table 81 side Is formed to be short, and after the workpiece 300 is settled is configured to roll down to the inclined table 82 when the discharge support 81 is moved upward.

On the other hand, the inclination table 82 is configured to be lowered toward the outside toward the discharge support 81 side.

In addition, the transfer means 90 for supplying the workpiece 200 and the discharge of the workpiece 300 is configured.

The movement means 90 is located at an upper portion between the supply portion 10 receiving the workpiece 200 and the discharge portion 80 for discharging the workpiece 300, and is installed below the suction portion 70.

In detail, the moving unit 90 moves up and down along the first loader 92 reciprocating along the loading bed 91 and picks up the workpiece 200 supported by the supply support 12. The supply chamber 93 which positions the workpiece 200 between 30 and the rotating headstock 40 is comprised.

At this time, the supply chamber 93 is operated by the pneumatic pressure, the lower end is formed in the shape of tongs that can pick up the workpiece 200.

On the other hand, located in the center of the loading bed 91 and moved along the second loader 94 reciprocating and picked up and discharged the workpiece 300 supported between the tailstock 30 and the rotary headstock 40 The discharge chamber 95 is placed in the support 81 is formed.

The discharge chamber 95 is formed in the same structure as the supply chamber 93.

That is, the gap between the tailstock 30 and the rotary headstock 40 installed in the supply chamber 93 and the main bed 21, and the tailstock 30 and the rotary headstock 40 and the discharge support 81, respectively. The intervals are configured identically.

At this time, the initial position of the supply chamber 93 is located above the supply support 12, and the initial position of the discharge chamber 95 is located at the center of the tail stock 30 and the rotating headstock 40.

As a result, the supply chamber 93 picks up the workpiece 200 held by the supply support 12 and discharges the finished material 300 which has been heat-treated supported by the tailstock 30 and the rotary headstock 40. The chamber 95 is picked up.

Thereafter, the supply chamber 93 moves along the loading bed 91 to position the workpiece 200 to be supported by the tailstock 30 and the rotating headstock 40, and the discharge chamber 95 is also loaded with the loading bed ( It moves along 91) to place the workpiece 300 in the discharge support (81).

That is, the supply chamber 93 is moved downward to pick up the workpiece 200 and the discharge chamber 95 is configured to pick up the workpiece 300 to simultaneously supply and discharge the heat treatment apparatus 100. .

Referring to the heat treatment method performed using the heat treatment device of the present invention configured as described above are as follows.

First, a focal length calculation step S1 of calculating the laser focal length L of the laser oscillator 60 is performed.

In this, the focal length calculation step (S1) is installed so that the jig 61 is supported on the tailstock 30 and the rotating headstock 40 so as not to rotate.

Then, the diode laser is irradiated onto the laser irradiation surface 61b from the laser oscillation unit 60.

At this time, the jig 61 moves slowly as the main bed 21 moves, and the laser irradiates the laser irradiation surface 61b positioned on the rotation headstock 40 side.

As a result, the trace of the laser beam irradiation of the shape shown in FIG. 7B remains on the jig 61, and when the intensity of the laser beam is constant, the optimal focal length L of the optimal laser beam = L1 + L2 Calculate as

(L1: fixed value indicating the shortest distance between the laser oscillation unit 60 and the jig 61, L2: relationship between the mounting angle α of the jig and the distance b to the optimum irradiation point, i.e. Is the calculated value.)

After the focal length calculation step (S1), the workpiece 200 placed in the supply support 12 is picked up and moved by the supply chamber 93 so that the tailstock 30 and the rotating headstock 40 A feeding step (S2) is placed in between.

That is, in the supplying step S2, when the workpiece 200 is displayed on the inclined table 11 in a line array using manpower, the supply support 12 is rolled up by the inclination and placed in the supply support 12. Go to and support the workpiece 200.

Subsequently, the supply chamber 93 picks up the workpiece 200 and is made of an exaggerated position between the tailstock 30 and the rotating headstock 40, and the workpiece 200 displayed by the inclination table 11 is displayed. ) Is a step that can be automatically supplied.

Next, after the supply step (S2), the origin check step (S3) for determining the accuracy of the initial position of the workpiece 200 for heat treatment at the correct position by the non-contact position detection sensor 41 is performed. .

In this, the origin check step (S3) is the workpiece 200 is supplied by the supply chamber 93 is to be transferred to the workpiece 200 in a state supported by the tailstock 30 and the rotary headstock 40. This is to prevent the point where the laser is irradiated exactly to the portion to be subjected to the surface heat treatment.

In addition, the straightness distance (R1) obtained by irradiating a laser from the non-contact distance sensor 51 to the central portion of the workpiece 200 that is rotated together by the rotation of the rotary headstock 40 after the origin check step (S3). , R2) Checks the match and disagreement, and if it is a match, if it is a pass, if it is a mismatch, R1 = R2 discrimination step (S4) is executed.

At this time, the non-contact distance sensor 51 irradiates the laser beam for measuring the distance to the left and right apex of the workpiece 200 to face the workpiece 200 in the center.

That is, if the straightness distance between the laser irradiated from one non-contact distance sensor 51 and the workpiece 200 is R1, the laser beam irradiated from the other non-contact distance sensor 51 and the workpiece 200 are true. In the case of the straightness distance R2, when the workpiece 200 is rotated once, the straightness distances R1 and R2 are equal to each other without increasing or decreasing. If the change occurs, the straightness is determined to be poor. .

Then, after passing the R1 = R2 determination step (S4), if passed, the workpiece 200 is irradiated with a diode laser from a pair of laser oscillation units 60 to perform heat treatment, and the workpiece 200 fails. In one case, a heat treatment for discharging through the discharge support 81 and the inclined table 82 by the discharge chamber 95 and a poor discharge step S5 are performed.

As a result, the workpiece 200 may be fundamentally determined to be poor in straightness or may be due to a defect in processing, thereby preventing unnecessary processing of surface heat treatment of the defective workpiece 200.

In addition, the surface of the defective workpiece 200 is not thermally treated to prevent waste of power, fundamentally block time consumption, and shorten the heat treatment process time by using a pair of laser oscillators 60. .

In addition, the graph shown in Figure 9b shows the result of measuring the hardness after the heat treatment at three points of # 1, # 2, # 3 divided into three circumference of the workpiece.

That is, the depth of heat treatment in the circumferential direction during the laser heat treatment using the conventional single laser oscillator did not achieve the same heat treatment depth due to the heat conduction at the point where the heat treatment starts and ends, but by using a pair of laser oscillator 60 It is confirmed that a uniform heat treatment depth from the start position to the end point can be obtained by reducing the variation in thermal conductivity than the heat treatment using a single laser oscillator during laser heat treatment.

In addition, the temperature measurement step (S51) for measuring the surface temperature of the workpiece 200 irradiated with the laser irradiated from the laser oscillation unit 60 using the non-contact temperature sensor 62 in the heat treatment and poor discharge step (S5). It is implemented to include more.

That is, the temperature measuring step (S5) can be confirmed to maintain a constant temperature when the diode laser is irradiated, the hardness of the workpiece 200 due to the change of the laser temperature appears irregular or due to the problem of thermal conductivity It is for measuring the temperature so that melting of the surface of the workpiece 200 occurs so that no defect occurs.

Next, at the same time as the heat treatment and bad discharge step (S5), when performing the heat treatment of the passed workpiece 200, the suction to operate the suction unit 70 for removing the smoke and foreign substances generated during the heat treatment Suboperation step (S6) is constructed.

As a result, the smoke generated during the heat treatment of the oil, cutting oil, foreign matter, etc., which are buried on the surface of the workpiece 200 during the heat treatment by the laser irradiated from the laser oscillation unit 60, and the residue of the combustion, may be stored in the workplace. It is to prevent contamination and to be deposited on the laser oscillation unit 60.

Finally, the suction part operation step (S6) is maintained in a state that is continuously carried out after the heat treatment and poor discharge step (S4), the surface treatment is completed, the workpiece 300 is picked up by the discharge chamber (95) It is discharged to the discharge unit 80 through the discharge support 81, the inclination table 82.

At the same time as the discharge operation, the workpiece 200 moved along the inclined table 11 and placed on the supply support 12 is picked up by the supply chamber 93 to provide the tailstock 30 and the rotating headstock 40. A feeding and discharging step S7 is placed between.

Thus, the discharge step (S7) for discharging the processing material 300 in the supply step (S2) for supplying the workpiece 200 until the target value of the processing amount is repeatedly performed sequentially.

Therefore, the heat treatment time for surface heat treatment of the workpiece 200 is shortened, productivity is increased, labor costs are reduced by minimizing the manpower of management, and the defective workpiece 200 through the straightness is discharged by selective discharge of unnecessary processes. There are features and benefits that prevent progress.

In the above, the present invention has been illustrated and described with reference to specific preferred embodiments, but the present invention is not limited to the above-described embodiments and is not limited to the spirit of the present invention. Various changes and modifications can be made by those who have

As described above, the present invention has the effect of shortening the heat treatment process time and even distribution of the heat treatment depth by dividing the area of the workpiece rotating the laser irradiated from the pair of high power diode laser oscillation parts. .

In addition, the depth of heat treatment in the circumferential direction during the laser heat treatment using the conventional single laser oscillator did not achieve the same tendency due to the heat conduction at the point where the heat treatment starts and ends. Since the deviation of the thermal conductivity is lower than that of the single heat treatment, the uniform heat treatment depth from the start position to the end point can be obtained.

In addition, the inclined tables of the supply unit and the discharge unit are formed so that the supply of the workpiece is smooth and the discharge of the workpiece is smooth.

In addition, by inspecting the straightness of the workpiece, the defective workpiece can be selected, thereby minimizing the incidence of the defective workpiece, and also reducing the work time and unnecessary work by not performing surface heat treatment on the defective workpiece. There is an effect that does not generate the waste required for the process.

In addition, the non-contact position sensor can be used to set the exact initial position of the workpiece, there is an effect that the heat treatment position is accurate.

In addition, there is an effect that a uniform heat treatment is performed by measuring the surface temperature change of the workpiece to be irradiated with the laser irradiated using a non-contact temperature sensor.

As well as. By using the suction unit to inhale the smoke and foreign substances generated during heat treatment to create a pleasant working environment, there is an effect to prevent the foreign substances are deposited on the workpiece and the laser oscillation unit.

Claims (9)

A supply part 10 to which the work material 200 rolled along the inclination table 11 is placed and at the same time the supply support 12 is moved up and down to support, A bed 20 connected to the supply unit 10 to receive the workpiece 200 and having a main bed 21 for reciprocating movement; A tailstock 30 installed on the main bed 21 of the bed 20 to support one end of the workpiece 200; It is installed on the opposite side of the tail stock 30 to support the other end of the workpiece 200, the rotary headstock 40 to rotate and drive; Located between the tailstock 30, the rotary headstock 40, the straightness inspection unit 50 for checking the straightness of the supplied workpiece 200, Located between the tailstock 30 and the rotary headstock 40, the pair of workpieces facing each other to the bed 20 for the surface heat treatment in the lattice shape by irradiating the diode 200 by dividing the workpiece 200 Laser oscillation unit 60, An upper portion of the laser oscillation unit 60, the suction unit 70 for sucking the smoke and foreign substances generated during the heat treatment, The discharge support 81 which is moved up and down so that the workpiece 300, which has been subjected to the surface heat treatment, is raised and floated to be discharged by a rolling action, and includes an discharge part 80 formed inside the inclined table 82; The spool heat treatment machine using a diode laser, characterized in that to reduce the processing cost by selecting the defect of the workpiece 200, the surface heat treatment time is shortened. The method according to claim 1, wherein the straightness inspection unit 50 is fixed to the bed 20 to examine the central portion of the workpiece 200 is composed of a pair of non-contact distance sensor 51 formed to face the laser irradiation ; When the workpiece 200 is rotated while being supported by the tailstock 30 and the rotating headstock 40, the straightness distances R1 and R2 irradiated by the non-contact distance sensor 51 are matched or inconsistent. Spool heat treatment using a diode laser, characterized in that configured to determine the straightness. The laser beam fixed to the bed 20 while moving in a state of being supported by the tailstock 30 and the rotating headstock 40 so as to calculate the optimum laser focal length of the laser oscillation unit 60 is not fixed. Spool heat treatment machine using a diode laser, characterized in that consisting of a jig 61 is irradiated with a laser from the oscillator (60). The support jig 61 has support ends 61a formed at both ends of the jig 61 so as to be supported by the tailstock 30 and the rotation headstock 40. The jig 61 extends inward of the support end 61a and is trapezoidal. A spool heat treatment machine using a diode laser, characterized in that the laser irradiation surface (61b) formed on both sides on the basis of the raised vertex in the shape. The non-contact temperature sensor (62) according to claim 1, further comprising a non-contact temperature sensor (62) for measuring the surface temperature of the workpiece (200) irradiated with a laser on one side of the laser oscillator (60); A spool heat treatment machine using a diode laser, characterized in that configured to measure the surface temperature of the workpiece to be irradiated with the laser during the surface heat treatment. The non-contact position detection sensor 41 of claim 1, wherein one side of the rotary headstock 40 is coupled to the bed 20 to be positioned at a correct position of the workpiece 200. Spool heat treatment machine using a diode laser. The method of claim 1, wherein the first loader reciprocating along the loading bed 91 is located between the supply unit 10 receives the workpiece 200 and the discharge unit 80 for discharging the workpiece 300 92, the supply chamber for lifting the workpiece 200 supported by the supply support 12 and moving the workpiece 200 between the tailstock 30 and the rotary headstock 40, 93), Located in the center of the loading bed 91 and moving along the second loader 94 reciprocating and picking up the workpiece 300 supported between the tailstock 30 and the rotary headstock 40 to discharge the support ( A conveying means (90) formed of a discharging chamber (95) settled in (81); The supply chamber 93 is moved downward to pick up the workpiece 200 and at the same time the discharge chamber 95 picks up the workpiece 300 and uses the diode laser to be configured to supply and discharge at the same time. Spool Heater. A focal length calculation step (S1) of calculating a laser focal length L for adjusting the distance between the workpiece 200 and the laser oscillator 60 before laser heat treatment; After the focal length calculation step (S1), the work chamber 200 is moved to the workpiece 200 placed in the supply support 12 to be positioned between the tailstock 30 and the rotating headstock 40 Supply step (S2), After the supply step (S2), the origin check step (S3) for determining the accuracy of the initial position of the workpiece 200 in order to heat treatment at the correct position by the non-contact position detection sensor 41, After the origin check step (S3), the straightness distance (R1, R2) obtained by irradiating the laser from the non-contact distance sensor 51 to the central portion of the workpiece 200 to be rotated together by the rotation of the rotary headstock 40 R1 = R2 judging step (S4) to check the match and discrepancy, and to determine the straightness as the pass if the match and pass if the discrepancy, After passing R1 = R2 discrimination step (S4), if passed, the workpiece 200 is irradiated with a diode laser from the laser oscillation unit 60 to perform heat treatment, and if the workpiece 200 fails, the discharge chamber. Heat treatment and poor discharge step (S5) for discharging through the discharge support 81, the inclination table 82 by the 95, It is made at the same time as the heat treatment and bad discharge step (S5), when performing the heat treatment of the accepted workpiece 200, the suction part operating step of operating the suction part 70 for removing the smoke and foreign substances generated during the heat treatment (S6) and, Suction unit operation step (S6) is carried out continuously and after the heat treatment and bad discharge step (S4), the surface treatment is completed, the workpiece 200 is picked up by the discharge chamber 95, the discharge support 81, inclined The work piece 200 which is discharged to the discharge part 80 through the table 82 and is moved along the inclination table 11 and settled in the supply support 12 is picked up by the supply chamber 93 and the tailstock ( 30) and the spool heat treatment method using a diode laser, characterized in that consisting of the supply and discharge step (S7) positioned between the rotary headstock (40). The temperature measurement for measuring the surface temperature of the workpiece 200 irradiated with the laser irradiated from the laser oscillation unit 60 using the non-contact temperature sensor 62 in the heat treatment and poor discharge step (S5). Spool heat treatment method using a diode laser, characterized in that further comprises a step (S51).

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