JP3068934B2 - Roll dull processing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of dulling a roll, and more particularly, to microscopically forming the surface of a roll for cold-rolled steel sheet, hot-dip galvanized or various electroplated steel sheets. The present invention relates to a dull processing method for forming irregularities in a predetermined arrangement state.

[0002]

2. Description of the Related Art Generally, thin steel sheets such as cold-rolled steel sheets are used to improve the seizure resistance during press forming, as seen in thin steel sheets for painting of automobile bodies and household electric appliances. The method of subjecting to temper rolling is adopted.
This temper rolling is performed by performing light rolling using a roll provided with a concavo-convex pattern comprising a large number of fine irregularities on the surface, thereby imparting a small appropriate surface roughness to the steel sheet surface. Things.

Conventionally, shot blasting and electric discharge machining have been used for dulling the rolls. However, in the temper rolling using the rolling rolls according to these methods, since the surface of the steel sheet presents a non-uniform rough surface and has a small flat area ratio, the painted surface has become an important management item in modern times. Could not meet the demand for improved image clarity (combined gloss and image clarity).

Therefore, in recent years, for example, Japanese Patent Publication No. Sho 62-1192
No. 2 (first conventional example), Japanese Patent Application Laid-Open No. 55-94790 (second conventional example), and Japanese Patent Application No. 62-225640 (third conventional example), surface roughness is formed. Attempts have been made to make the pattern of concavities and convexities regular and increase the flat area ratio. Of these, the first
The dull processing method according to the conventional example using laser radiation and the dull processing method according to the first conventional example respectively mechanically connect the turning axis of the roll to be processed and the rotation axis of the chopper for interrupting the laser beam during dull processing. Are performed by synchronizing. In the dull machining method according to the third conventional example, the pitch position of the actually processed unevenness is detected by a pitch sensor using another laser beam for measurement, and the rotation of the chopper is controlled by a PLL (Phase Locked) based on the detected value. Loop)
Thus, the position of the concave portion to be processed and the rotation of the chopper are synchronized. Incidentally, the microscopic irregularities formed by these processing methods are referred to as microcraters in which an annular convex portion is formed around a circular concave portion.

However, in the first and second conventional examples, since the rotation of the roll to be processed and the chopper are synchronized, the pitch of the micro crater applied to the roll surface in the roll circumferential direction is constant. However, since the roll is continuously rotating, the trajectory following the micro crater is a continuous spiral, and even if the integral multiple of the array pitch in the roll circumferential direction is not equal to the roll circumference, during processing, If an error occurs in the array pitch once due to disturbance or the like, the subsequent micro craters will be processed with the pitch error included, making it impossible to control the phase difference of the micro crater in the roll axis direction. was there.

In the third conventional example described above, since the processing method is based on the detected value of the concave position of the actually processed micro crater, the arrangement pitch of the micro craters in the roll circumferential direction is constant. Although it is possible, there is a detection error due to position detection and delay of the feedback system, and furthermore, if machining is performed once with a pitch error caused by disturbance etc., this pitch error will be copied in the axial direction until the end of machining etc. Therefore, there is an unsolved problem that the phase matching accuracy of the micro crater in the roll axis direction is low. In addition, although a laser beam is frequently used as a pitch sensor, in such a case, the laser beam system is doubled, and the processing cost may be increased.

[0007] The problem that the phase difference of the micro crater in the roll axis direction cannot be controlled with high accuracy in each of the conventional examples described above is directly reflected in the result of temper rolling. That is, the irregularities on the surface of the steel sheet subjected to the temper rolling by such a rolling roll become irregularly transferred patterns in the rolling direction (longitudinal direction), but irregularly in the sheet width direction. The transferred uneven pattern is obtained, and the steel sheet has anisotropy with respect to the uneven pattern in the vertical and horizontal directions. When the steel sheet having this anisotropy is coated in a vertical position, for example, due to various restrictions on work, when the steel sheet is rolled up and down, and when the steel sheet width direction is changed up and down. Then, by the micro flow difference of paint, that is, uneven flow,
It is known that there is a difference in sharpness.

That is, for example, when painting is applied to parts for automobiles, the sharpness after painting greatly differs depending on whether the rolling direction of the steel sheet is vertical or horizontal, and there is a significant difference in product quality. Problem. On the other hand, in an attempt to avoid this, for example, when pressing a steel plate, it is restricted to perform a pressing operation in only one direction,
Not only the work efficiency is lowered by increasing the restriction factor of the press work, but also the area of the steel plate not used in the press is increased, which leads to an increase in the material cost.

Accordingly, the applicant of the present invention has previously described Japanese Patent Laid-Open No.
No. 07 proposes a roll dulling method. This dull processing method selects the number of micro craters corresponding to the pitch closest to the desired arrangement pitch from the preset number data of micro craters, which is an integer per roll rotation, and selects the selected number. A chopper rotation speed command value and a roll rotation speed command value are set at integer ratios at which the chopper rotation phase and the roll rotation phase are synchronized with each other. A pulse signal obtained according to the rotation state of the chopper is input, for example, the both pulse signals are frequency-divided at a predetermined frequency division ratio, respectively, and the roll rotation speed command is set so that the deviation per time becomes zero. The value or the chopper rotation speed command value is corrected (fourth conventional example). Further, the present invention also provides a chopper rotation speed command value and a roll rotation speed command in which the rotation phases of the chopper and the roll are synchronized with each other when the set number of micro craters are formed in a circumferential direction of the roll and shifted by ピ ッ チ pitch. Calculate the values and, based on these two command values, rotate the roll and chopper respectively, and
During one rotation of the roll, 1 / in the circumferential direction of the roll.
A dulling method for moving the high-density beam energy in the roll axis direction by a distance equal to two pitches is also disclosed (fifth conventional example). Further, in the present invention, after the beam energy is scanned as in the fourth conventional example, the beam energy is shifted to a position shifted by a half pitch in each of the roll circumferential direction and the roll axis direction with respect to the scan position by the first scan. A dull processing method for performing the same second scan as the first scan is also disclosed (sixth conventional example).

In the fourth conventional example, the number of micro craters most suitable for one rotation of the roll with respect to the desired pitch is set, and the chopper rotation speed command value and the integer ratio of the chopper rotation phase and the roll rotation phase are synchronized. By setting a roll rotation speed command value and rotating the roll and chopper based on the two command values, it is possible to eliminate a deviation in the roll circumferential direction of the arrangement pitch for each rotation. Also, by correcting the two command values so that the deviation of the pulse signal from the roll and chopper becomes zero,
The phase error between the roll and the chopper due to the disturbance is eliminated, and the concavo-convex pattern of the micro crater can be formed with a completely rectangular arrangement pitch.

Further, in the fifth and sixth conventional examples, a half is used.
Since it is possible to form a so-called staggered uneven pattern in which the micro craters are displaced for each pitch, it is possible to suppress the micro flow difference of the paint described above and thereby improve the sharpness of the coating film.

[0012]

The dull processing methods of the fourth to sixth conventional examples do not have such a problem.
However, with the recent realization of high-mix low-volume production, more various uneven patterns are required. For example, micro-craters are formed at a predetermined pitch in the axial direction in the axial direction of the roll and at a predetermined pitch in the circumferential direction in each row in the axial direction of the roll. The arrangement of the rolls in the circumferential direction matches every predetermined n rows, and the circumferential arrangement of the adjacent rolls in the circumferential direction of the rolls is set in advance between the n rows in the roll axis direction in which the arrangements match. In some cases, uniform or different phase differences are sequentially formed. Such a concavo-convex pattern cannot be achieved at least in the fourth conventional example, and the fifth and sixth conventional examples cannot be achieved.
In the conventional example, for example, even if the shift of the circumferential arrangement pitch is set to 1 / (n-1) times the pitch, a different phase difference cannot be formed in the arrangement pitch of the adjacent rows.

The present invention has been developed in response to this demand, and the arrangement pitch in the roll circumferential direction of the adjacent row between the n rows in the roll axis direction having the same arrangement is uniform or predetermined. An object of the present invention is to provide a roll dulling method capable of forming a concavo-convex pattern having a different phase difference.

[0014]

According to the method of the present invention, a high-density beam energy is passed through a through-hole formed in a rotating mechanical chopper to form a beam energy pulse into a rotating state. The beam energy pulse is irradiated on the surface of the roll while moving it at a predetermined speed by a feed mechanism in the roll axis direction, and the microscopic unevenness formed by melting the roll surface with the beam energy pulse is generated in the axial direction of the roll. Are formed at a predetermined pitch in the axial direction and at a predetermined pitch in the circumferential direction in the circumferential direction of the rolls in each row. The arrangement in the roll circumferential direction coincides with each other, and among the n rows in the roll axis direction in which the arrangement coincides, the roll circumferential arrangement in the adjacent row has a preset uniform or different phase difference. A dulling method for a roll formed next, wherein the number of concavities and convexities per rotation of the roll is set as a natural number corresponding to a pitch closest to the desired circumferential arrangement pitch. On the other hand, a chopper rotation speed command value and a roll rotation speed command value of an integer ratio at which the chopper rotation phase and the roll rotation movement are synchronized are set, and the machine chopper rotates in the roll axis direction in the roll axis direction per rotation of the roll. n-1) A chopper moving speed command value that is moved by a factor is set, and the roll, the mechanical chopper, and the feed mechanism are driven based on the chopper rotating speed command value, the roll rotating speed command value, and the chopper moving speed command value. To form a first row of microscopic irregularities, and thereafter, a chopper rotation speed command value of an integer ratio in which the chopper rotation phase and the roll rotation are synchronized. And without changing the roll rotation speed command value, the feed start mechanism shifts the processing start point of the second row from the processing start point of the first row by the axial arrangement pitch in the roll axis direction, and microscopically displays the first row. The rotational phase shift of the mechanical chopper that satisfies a predetermined phase difference formed between the target unevenness and the microscopic unevenness in the second row is set, and the rotational phase shift is controlled so as to be actually realized by the mechanical chopper. Meanwhile, the mechanical chopper, the roll, and the feed mechanism are driven based on the chopper rotation speed command value, the roll rotation speed command value, and the chopper moving speed command value, and the above operation is sequentially repeated (n-1) times to obtain the irregularities. It is characterized by forming a pattern.

[0015]

According to the roll dulling method of the present invention, first, as in the fourth conventional example, the number of concavities and convexities per rotation of the roll is set as a natural number corresponding to the pitch closest to the desired circumferential arrangement pitch. Therefore, the arrangement of the micro craters formed after one rotation of the roll coincides with the circumferential direction of the roll. Then, a chopper rotation speed command value and a roll rotation speed command value of an integer ratio at which the chopper rotation phase and the roll rotation movement are synchronized with respect to the set number of irregularities are set,
The roll and the mechanical chopper are driven based on the chopper rotation speed command value and the roll rotation speed command value, and the machine chopper is (n-1) times the axial arrangement pitch in the roll axis direction per rotation of the roll. By setting the chopper moving speed command value to be moved and driving the feed mechanism based on the chopper moving speed command value, the axial rows of micro-craters formed in a substantially spiral shape are arranged in the circumferential direction. And are separated by (n-1) times the axial arrangement pitch.

Thereafter, without changing the chopper rotation speed command value and the roll rotation speed command value of the integer ratio at which the chopper rotation phase and the roll rotation movement are synchronized, the machining start point of the second column is changed to the first column. The rotational phase of the mechanical chopper which is shifted from the processing start point by the axial arrangement pitch and satisfies a predetermined phase difference formed between the first row of microscopic irregularities and the second row of microscopic irregularities. By setting a shift, for example, a signal from an encoder attached to the drive motor of the chopper is input to a delay circuit, and the time constant of the delay circuit is changed so that the rotation phase shift can be realized on the chopper. By driving the mechanical chopper, roll, and feed mechanism based on the chopper rotation speed command value, the roll rotation speed command value, and the chopper moving speed command value, the second row Over data in the state shifted by a predetermined phase difference in spaced and circumferentially axially pitch from the first row, it is formed substantially helically roll surface.

By repeating this operation (n-1) times in the same manner as in the second row of microcraters,
The micro-craters in each row are formed so as to be apart from each other by the pitch in the axial direction and to be shifted in the circumferential direction by a predetermined phase difference, so that the uneven pattern is formed.

[0018]

FIG. 1 shows an example of a laser dull processing apparatus using a laser beam, which implements the roll dull processing method of the present invention. In the same figure, the roll 2 for temper finish rolling for dulling has journals 2a at both ends thereof.
2b is rotatably supported by supports 6a and 6b erected on a fixed foundation (not shown) of the dulling machine 4.

The dulling machine 4 includes a high-power laser beam oscillator 12 for irradiating the surface of the roll 2 with a laser beam,
A rotary chopper (mechanical chopper) 14 having a disk with a slit interposed in the propagation path of the laser beam output from the laser beam oscillator 12 and intermittently interrupting the beam; A chopper drive motor 16 connected to the rotation shaft, a roll rotation motor 18 directly connected to the roll 2 via the drive shaft 10 to drive the roll 2 to rotate, and mounted on the rotation shafts of both motors 16, 18. It has encoders 19 and 20 and a control unit 21 for controlling the rotation of the motors 16 and 18. The laser oscillator 12, the chopper 14, and the chopper driving motor 16 can be fed on a rail (not shown) along the axial direction of the roll 2, and are mounted on a carriage 22 provided on a fixed foundation. Reference numeral 22 is connected to a feed mechanism 24. The feed mechanism 24 starts driving by the drive signal SV _H and moves the carriage 22.

As shown in FIG. 1, the control unit 21 includes a command device 26 equipped with a computer, speed controllers 28 and 30 for controlling the rotation speeds of the chopper drive motor 16 and the roll rotation motor 18, respectively. And a delay circuit 35 and a F / V converter 3 which form a feedback system based on output signals of encoders 19 and 20 which are rotation sensors.
6, frequency dividers 38a and 38b, deviation counter 40, D / A
It has a converter 42 and an adder 44.

The encoders 19 and 20 are connected to the motor 1
These output rotation speed signals DV ₁ and DV _2, which are pulse signals proportional to the rotation speeds of the motors 6 and 18, respectively. In order to increase the resolution and increase the detection accuracy, the number of pulses generated per rotation is increased (for example, 2 (The encoder 20 on the side of the chopper 14 has more than 10 ⁴ pulses / rotation, and the encoder 19 on the side of the chopper 14 has more than 10 ³ pulses / revolution.)
You have set. The number of generated pulses (pulses / rotation) is determined from conditions such as the roll diameter, the number of slits of the chopper, the pitch of the dull, and the accuracy of phase matching.

The encoder 19 on the chopper 14 side
Is connected to a delay circuit 35, further connected to a speed controller 28 via an F / V converter 36, and connected to a frequency divider 38a. The speed controller 28 has a delay circuit The 35 output signal DV ₁ ′ is converted into a voltage signal V ₁ proportional to the frequency and applied. Therefore, the speed controller 28 uses the given rotation speed command signal SV _C as a reference signal, and performs feedback control on the rotation speed of the motor 16, that is, the chopper 14 so that the detection signal V ₁ matches the reference signal SV _C. I do. In the present invention, the command device 26
Circuit 35 by the chopper phase difference signal SId from
Yes as the time constant is changed, the rotation at this time a change of constants is performed, the motor 16 and the chopper 14 for a given rotational speed command signal SV _C is delayed by a phase difference Id or willing It is to be done. In the delay circuit 35, an integrating circuit is used when the time constant is changed to the delay side, and a differentiating circuit is used when the time constant is changed to the fast moving side.

The output of the encoder 20 on the roll 2 side
The end is connected to the speed controller 30 and the frequency divider 38b.
You. For this reason, the speed controller 30
The rotation speed command signal “SV_R-V_Three"
The reference signal “SV _R-V_Three] To the encoder
20 detection signals DV_TwoMotor 18 so that
The rotation speed of the roll 2 is feedback-controlled.

In this embodiment, the frequency dividers 38a and 38b are
When the rotations of the rolling roll 2 and the chopper 14 are synchronized at a fixed ratio, the frequency division ratios (1 / S ₁ ), (1/1) at which both frequency division results (the number of pulses per unit time) become the same value are obtained.
S ₂ ) = R (where S ₁ and S ₂ are positive integers). Among them, the frequency division ratio of the frequency divider 38b on the roll 2 side can be selected from other values based on the control signal SR from the command device 26, for example, when the diameter of the roll 2 changes. .

Further, the output sides of the frequency dividers 38a and 38b are:
An adder via a deviation counter 40 and a D / A converter 42
44 comparison input terminals. For this reason, deviation
The counter 40 is delayed by the delay circuit 35 and
Speed signals D obtained by dividing the frequency by the two frequency dividers 38a and 38b, respectively
V₁", DV_Two'Is a digital quantity deviation signal DV. _Three
Is calculated as This deviation signal DV_ThreeIs D / A conversion
Analog signal V having a voltage value_ThreeIs converted to
Value according to the actual rotation speed difference between
And applied to the adder 44.

On the other hand, a command is input to the reference input terminal of the adder 44.
Rotation speed command according to rotation speed that can be changed from device 26
Signal SV_RIs applied, and the output side of the adder 454 is low.
To the speed controller 30 on the rule 2 side. Therefore, the adder 4
4 is a rotation speed command signal SV _RThe reference signal corrected for
"SV_R-V_ThreeIs output to the speed controller 20. others
As a result, a deviation occurs in the outputs of both frequency dividers 38a and 38b.
Only when the rotation speed command signal SV_RHit the deviation
Correction to erase is applied.

Next, the operation of the above embodiment will be described with reference to FIG. In this embodiment, dulling is performed on the roll surface such that the arrangement pitch in the roll axis direction is the same as the arrangement pitch in the circumferential direction. First, when the power of the dulling machine 4 is turned on, the command device 26 starts the processing shown in FIG. 2 based on a predetermined program stored in the storage device of the computer.

The process will be described. In step S1 of the figure, a machining origin return command is sent. This is sent to the chopper drive motor 16, the roll drive motor 18 and the feed mechanism 24, whereby the encoders 19 and 20 provided in the respective motors and the feed control (not shown) provided in the feed mechanism 24 are provided. The mechanism is returned to satisfy the machining origin given as a so-called initial setting so that the mechanism or the like becomes the origin.

Next, the operation proceeds to step S2, where it is checked whether or not the motors 16, 18 and the feed mechanism 24 are at the machining origin.
The process proceeds to 1 to continue sending the machining origin return command. When the motors 16 and 18 and the feed mechanism 24 return to the processing origin, the process proceeds to step S3, and it is determined whether or not the counter value C of a not-shown counter built in the command device 26 itself is zero. If the counter value C is zero, the process proceeds to step S4; otherwise, the process proceeds to step S2.
Move to 3.

In step S4, a command SId = 0 for clearing the chopper phase difference stored in the delay circuit 35 is given to the delay circuit 35 in order to give a phase difference to the chopper 14.
Send to. At the next step S5, the rotation speed V _C of a given chopper 14, the diameter D _R of the roll 2, the desired arrangement pitch P of the micro-craters', the number of columns circumferential pitch match (Article number) n (In this embodiment, n
= 4) is read.

Next, the process proceeds to step S6 to calculate the number N 'of temporary craters according to the following equation. N ′ = π · D _R / P ′ (1) Next, the process proceeds to step S7, where the number of slits of the chopper 14 is T (natural number), and the number of rotations of the chopper 14 is V _C , according to the following two equations. Temporary roll rotation speed V _R 'of roll 2
Is calculated.

[0032] _{V R '= V C · T} / N' ......... (2) then the process proceeds to step S8, the roll 2 side dividers 38
The provisional frequency division ratio R ′ for b is calculated based on the following three equations. Note that K in the equation is a constant set in advance according to the processing conditions. _{R '= V R' / V} C · K ......... (3) then the process proceeds to step S9, from the division ratio group including a plurality of integer dividers 38b that is set in advance, tentative minute The value R closest to the frequency ratio R 'is set as the current frequency division ratio of the frequency divider 38b.

[0033] Next, the process proceeds to step S10, again calculates an actual roll rotation speed V _R of the roll 2 in accordance with the following Equation 4 by using the division ratio R of the frequency divider 38b determined in the step S9. V _R = R · V _C / K (4) Next, the process proceeds to step S11, and the actual micro crater number N is again calculated using the actual roll rotation speed V _R determined in step S10 by the following equation (5). Calculated according to

[0034] shifts to _{N = V C · T / V} R ......... (5) Next step S12, using the actual micro-craters number N determined in the step S11, the roll circumferential direction of the micro craters Is calculated according to the following equation (6). P = π · D _R / N (6) Next, the process proceeds to step S13. In this embodiment, the arrangement pitch of the micro craters in the roll circumferential direction is the same as the arrangement pitch of the micro craters in the roll axis direction. To do this, using the actual array pitch P of the micro craters in the roll circumferential direction determined in step S12, the roll axis moving speed V _H of the feed mechanism 24 is calculated according to the following equation (7).

V _H = (n−1) · P · V _R (7) Next, proceeding to step S14, the command device 26 stores the actual number of microcraters N and the actual array pitch P in its own device. The update is recorded on the display unit and the display unit 48 is instructed to display them. Thus, the pitch P selected and determined for the arrangement pitch P 'of the micro craters desired by the operator and the number N of micro craters per rotation of the roll can be known.

Next, proceeding to step S15, the command device 26 outputs a control signal SR to the frequency divider 38b on the roll 2 side, and sets the frequency division ratio R of the frequency divider 38b to the frequency determined by step S9. Set to the circumference ratio R. At the next step S16, the control corresponding to the chopper rotational speed given V _C and the calculated roll rotation speed V _R signal SV _C, SV _R chopper 14 side and the roll 2 side of the speed controller 28, The rotation is commanded by output to each of them.

Here, the rotation speed signal DV ₁ of the chopper 14 detected by the encoder 19 is applied to a delay circuit 35.
The output signal DV ₁ ′ passes through the frequency divider 38 a and is further divided by the frequency divider 38 a at the division ratio 1 / S ₁ to be DV ₁ ″ and input to the inverting side of the deviation counter 40. Speed signal DV of roll 2 detected by
₂ is divided by a divider 38b at a dividing ratio of 1 / S ₂ to obtain D
V ₂ ′ is input to the non-inverting side of the deviation counter 40. In the deviation counter 40, these input signals DV
Deviation DV _{3 between 1} ″ and DV ₂ ′ (= DV ₂ ′ −DV ₁ ″)
Is converted into an analog deviation signal V ₃ by the D / A converter 42 and input to the command device 26 and the adder 44. In this case, since the time constant of the delay circuit 35 has been cleared in step S4, the delay circuit 3
5 has no phase difference between the output signal DV ₁ ′ and the rotation speed of the chopper 14.

Next, the process proceeds to step S17, where the analog
Deviation signal V_ThreeIs read, and then the process proceeds to step S18.
Lever deviation signal V_ThreeJudge whether or not is zero.
If yes, go to step S19; otherwise, go to step S19.
Step S17 is repeated. Where the deviation signal
V_ThreeIs set in the adder 44 to which
Speed command signal SV_R"SV_R-V_ThreeCorrection
Calculation is performed, and the corrected signal “SV_R-V_Three"But
The output is output to the speed controller 30 on the roll 2 side. That is,
The rotation speed of the chopper 14 is higher than the rotation speed of the chopper 14.
If there is, the deviation signal DV_ThreeIs a positive value corresponding to the deviation.
The rotation speed command signal SV_RTo "SV_R-V _ThreeAmended to
And reduce the value. On the contrary, the rotation of the chopper 14
If the speed is greater than the rotation speed of roll 2, a deviation signal
DV_ThreeIs a negative value corresponding to the deviation, and the rotation speed command signal
No. SV_RTo "SV_R+ V_ThreeAnd increase the value.
Is controlled.

[0039] Therefore, the speed controller 30, a command signal input signal "SV _R -V _3", the motor so that the detection signal DV ₂ by the encoder 20 matches the command signal "SV _R -V _3" 18 by controlling the rotation, a rotation speed corresponding to the command signal of the roll 2 "SV _R -V _3". Furthermore, the division result DV ₁ "of the frequency divider 38a of the chopper 14 side as a reference value, while the deviation between the rotation state of the roll 2 side is present, the speed command signal" SV _R -V in response to the deviation ₃ Correct "." That is, the rotation speed of the roll 2 is set within a short period of time to the command value V _R from the command device 26.

On the other hand, the detection signal DV of the encoder 19
₁ is converted into an analog signal V ₁ by the F / V converter 36 and output to the speed controller 28. Therefore, the speed controller 28, the detection signal V ₁ is the rotational speed command signal SV
The rotation of the motor 16, that is, the rotation of the chopper 14, is controlled so as to match _C. Thus, the rotational speed of the chopper 14 is set to a value corresponding to the command signal SV _C in a very short time.

When the rotation speeds of the roll 2 and the chopper 14 reach the commanded values, both the frequency dividers 38
The output signals DV ₁ ″ and DV ₂ ′ of a and 38 b are equal, the output signal DV ₃ of the deviation counter 40 becomes zero, and the rotation speed of the chopper 14 is synchronized with an integer multiple of the rotation speed of the roll 2. When deviation dividing result by disturbance or the like in a synchronous state is about to occur, the command signal SV _R as described above is corrected in a direction to cancel the deviation, immediately deviation is returned to the state of zero. Therefore, almost continuously Synchronization status is obtained.

In the step S19 to which the synchronization has been confirmed and the process has proceeded, the control signal SV corresponding to the moving speed V _H calculated in the step S13 is supplied to the feed mechanism 24.
Outputs _H. Therefore, the feed mechanism 24 starts moving the carriage 22 in the roll axis direction at the speed V _H to start dulling. That is, the laser beam output from the laser oscillator 12 is formed into a pulse by passing through the slit of the rotating chopper 14, and is irradiated on the roll surface. Thereby, a micro crater e is formed on the roll surface in accordance with the melting by the beam energy. In the first dulling operation, the rotations of the roll 2 and the chopper 14 are synchronized at a constant ratio of an integral multiple, and the feed mechanism 24 moves the roll axis direction per one rotation of the roll by the moving speed V _H calculated in step S13. (N-1) of array pitch
= 3 times the speed, the integer number N of microcraters e calculated in step S11 are formed as shown in FIG. 3A while the roll 2 makes one rotation.

Next, the flow shifts to step S20 to confirm the completion of the first machining, and then shifts to step S21, where "1" is added to the counter value C and the value, that is, "1" is added. It is updated and recorded in the storage unit of the command device 26. Next, step S2
1 and the counter value C = 1 is changed to (n-1) = 3.
In this case, since they are different, the process returns to the step S1.

Then, in the same manner as described above, steps S1,
The process proceeds to step S3 via S2. In this case, since the counter value C = 1 ＝ 0, the process proceeds to step S23. In step S23, the counter value C = 1 is read, and then the process proceeds to step S24, where the counter value C is set to n, and the phase difference d _n = d ₁ of the micro crater in the circumferential direction of the roll in this case is set. Read.

[0045] Next, the process proceeds to step S25, the chopper 14 which satisfies the phase difference d ₁ of the sequence of the roll circumferential direction of this micro-craters to the sequence of the roll circumferential direction of the previous micro crater Phase difference (phase shift) Id
Is calculated according to the following equation (8). In this embodiment, the phase difference between the previous micro crater array and the micro crater array two times before is set to d _n−1 and d ₀ = 0.

[0046] Id = 2π / T · (d n -d n-1) / (D C · π / T) = (2 (d n -d n-1)) / (D C · π) ......... (8) Next, the process proceeds to step S26, in which a time constant change value of the delay circuit 35 satisfying the phase difference Id calculated in step S25 is calculated. In this case, the chopper phase difference Id
Is positive, it means that the current array is behind the previous array, so the output signal DV ₁ ′ from the delay circuit 35 is
The time constant is reduced to control as if it were moving forward. On the other hand, when the chopper phase difference Id is negative, the current arrangement proceeds with respect to the previous arrangement, so that the output signal DV ₁ ′ from the delay circuit 35 is controlled as if it is delayed. Set a large time constant.

[0047] Next, the process proceeds to step S27, the current phase difference d _n as a phase difference d _n-1 of the last command device 2
6 is updated and recorded. Next, the process proceeds to step S28, and outputs a time constant change signal SId corresponding to the time constant change value calculated in step S26 to the delay circuit 35 so as to satisfy the chopper phase difference command Id calculated in step S25. To change the time constant.

Next, the flow shifts to step S29, where the current machining start position H _O is calculated according to the following nine equations. Goes to _{H o = C · P ......... (} 9) then step S30, the processing start position H _O
The machining start axial movement signal SH _O corresponding to the feed mechanism 2
4 is output. As a result, the feed mechanism 24 moves the bogie 22 in the roll axis direction along the rail with respect to the processing origin, and shifts the bogie 22 by one pitch in the axial direction with respect to the first processing start point (processing origin) described above. The laser oscillator 12 and the chopper 14 are made to stand by at the advanced position.

Next, the process proceeds to step S19 through steps S14 to S18. When the rotation of the roll 2 and the chopper 14 starts during this time, the output signal DV ₁ ′ from the delay circuit 35 is output from the encoder 19 because the time constant of the delay circuit 35 is changed by the time constant change signal SId. The output rotation speed signal D of the chopper 14
That it is delayed or advanced by that amount with respect to V _1.

On the other hand, the frequency division ratio control signal SR and the roll and chopper rotation control signals SV _R and SV _C transmitted in steps S15 and S16 are the same as those in the first time.
For this reason, the condition for monitoring the rotation synchronization between the roll 2 and the chopper 14 in step S17 is the same. That is,
The divided output signal DV ₁ ″ of the divider 38 a and the divider 38
'Although deviation signal DV ₃ with the the two so that zero is quickly synchronized as described above, the delayed output signal DV ₁ inputted to the frequency dividing circuit 38a' divided output signal DV ₂ of b is already because it delayed or advanced with respect to the rotational speed signal DV _1, finally chopper 14 rotates synchronously with a shift by the phase shift Id relative roll 2.

After the synchronization between the chopper 14 and the roll 2 is confirmed in a state where the chopper 14 is shifted by a predetermined phase difference, dulling is started in step S19. In the second dulling operation, the rotations of the roll 2 and the chopper 14 are synchronized at a constant ratio of an integral multiple with the chopper 14 shifted by the predetermined phase difference Id, and the feed mechanism 24 is calculated in step S13. because it is moved in the roll per rotation roll axis direction arrangement pitch (n-1) = 3 times the speed by the moving speed V _H were,
While the roll 2 makes one rotation, the integer number N of microcraters f calculated in step S11 are formed as shown in FIG. 3B. In this case, the arrangement of the roll circumferential direction of the micro craters formed by dull machining 1st, roll circumferential array of this micro-craters are offset by the predetermined phase difference d _1.

Next, the flow shifts to step S20 to confirm the completion of the second machining, and then shifts to step S21, where "1" is added to the counter value C and the value, that is, "2" is added. It is updated and recorded in the storage unit of the command device 26. Next, step S2
Then, the counter value C = 2 is changed to (n-1) = 3.
In this case, since they are different, the process returns to step S1 again.

Steps S1 to S1 are performed in the same manner as described above.
After step S3, the process proceeds to step S23, where the counter value C = 2 is read, and in step S24, the phase difference d _n = d ₂ in the circumferential direction of the roll of the micro crater is read. Then the phase difference of the chopper 14 which satisfies the phase difference d ₂ of the arrangement of the roll circumferential direction of this micro-craters in accordance with the 8 expression in step S25 (phase shift)
Id is calculated, and then the process proceeds to step S26 to calculate the time constant change value of the delay circuit 35 in the same manner as described above. Then, the process proceeds to steps S27 and S28, and the time constant change signal SId is calculated.
Is output to the delay circuit 35 to issue a time constant change command.

Next, the process proceeds to step S29 to calculate the current machining start position H _O according to the above-described equation (9), and then proceeds to step S30 to output a machining start axial direction movement signal SH _O to the feed mechanism 24. The laser oscillator 12 and the chopper 14 are made to stand by at a position advanced by two pitches in the axial direction with respect to the first processing start point (processing origin) described above. Next, the third micro crater g is formed through steps S14 to S19. In this case, as in FIG. 3b, the micro crater roll formed by the second dulling process is formed in the same manner as described above. with respect to the circumferential direction of the arrangement pitch, roll circumferential arrangement pitch of this micro-craters with a shift by the predetermined phase difference d _2, it is formed on three pitches every spiral.

Next, the flow shifts to step S20 to confirm the completion of the second machining, and then shifts to step S21, where "1" is added to the counter value C and the value, that is, "3" is added. It is updated and recorded in the storage unit of the command device 26. Next, step S2
1 and the counter value C = 3 is changed to (n-1) = 3.
In this case, since they are the same, the process proceeds to step S31.

In the step S31, the counter value C is cleared and the program ends. In the dull steel plate subjected to the temper finish rolling using the roll 2 on which the micro craters are sequentially formed in this way, as shown in FIG. 4, those micro craters are transferred as dull grooves, The arrangement in the processing (longitudinal) direction of the dovetail groove e 'in one row matches the longitudinal arrangement of the dovetail groove e' in the fourth row in the width direction. The arrangement in the longitudinal direction coincides with the arrangement in the longitudinal direction of the fifth groove d 'in the width direction, and the arrangement in the longitudinal direction of the third groove g' in the third direction in the width direction (not shown). The arrangement in the longitudinal direction of the six rows of the dovetail grooves g 'matches. The arrangement of the first row of the dovetail grooves e ′ in the width direction in the longitudinal direction and the second row of the dovetail grooves f ′ in the second row direction
The longitudinal sequence are shifted in the longitudinal direction by a predetermined phase difference d _1. Also are longitudinally offset by a predetermined phase difference d ₂ is the longitudinal direction of the arrangement in the width direction second column of dull eyes grooves f 'longitudinal sequence and widthwise third column dull eyes grooves g of'. Therefore, a predetermined phase difference d ₃ between the longitudinal arrangement of the third groove in the width direction g ′ and the longitudinal arrangement of the fourth groove (equal to the first line) in the fourth line. Only in the longitudinal direction.

As described above, in the dulling method of the present invention, the arrangement pitches in the circumferential direction coincide with each other in the predetermined rows in the axial direction, and the arrangement pitches in the circumferential direction differ between the coincident rows by the predetermined phase difference. It is possible to freely form a micro crater which is shifted only by a distance. According to the above embodiment, the circumferential pitch and the axial pitch are the same.
By making these different, it is also possible to form any uneven pattern consisting of repeated patterns in the axial direction. Further, in the above embodiment, the phase difference of the circumferential arrangement pitch of the micro craters between the respective rows is set to be different, but if this is set to, for example, 1 / (n-1) times the arrangement pitch, the uniformity can be obtained. The phase difference can also be set.

[0058] In the above embodiment, the number of columns circumferential arrangement pitch of the micro-craters match: n, the phase difference between the arrangement pitch between each row: d _n, axial and circumferential arrangement pitch: P is not limited to this, and can be set arbitrarily. Further, in the above embodiment, a delay circuit is used as a means for providing a phase difference in the rotation phase between the chopper and the roll, and the phase difference can be arbitrarily changed by changing the time constant of the delay circuit. The invention is not limited to this, and other electric means can be adopted. It is also possible to mechanically shift only the chopper every time the microcraters in each row are processed.

[0059]

As described above, according to the roll dulling method of the present invention, when forming the micro craters of each row, the synchronous state of the chopper and the roll is not changed and the chopper is forced to rotate. By providing a phase difference,
In the axial direction of the rolls, the arrangement of the rolls in the circumferential direction coincides with each other at a predetermined axial arrangement pitch and at every predetermined n rows, and the roll circles of the adjacent rows are arranged between the n rows in the roll axial direction in which the arrangements match. The circumferential arrangement can easily form the uneven pattern of the micro craters in which the preset uniform or different phase differences are sequentially formed, thereby making it possible to manufacture a large variety of small-scale production dull steel plates as desired. And can contribute to a significant improvement in quality and production cost.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an example of a dull processing machine according to a processing method of the present invention.

FIG. 2 is a schematic flowchart of a program embodying the processing method of the present invention employed in the dull processing machine of FIG. 1;

FIG. 3 is an explanatory view of a micro crater formed on a roll surface by the dulling method of the present invention, wherein FIG.
State diagram of a micro crater formed by multiple processing,
(B) is a state diagram of a micro crater formed by the second processing, and (c) is a state diagram of a micro crater formed by the third processing.

FIG. 4 is a partial plan view of a steel sheet temper-finished by the rolls of FIG. 3;

[Explanation of symbols]

 2 is a roll 4 is a dulling machine 12 is a laser beam oscillator 14 is a chopper 16, 18 is a motor 19, 20 is an encoder 24 is a feed mechanism 26 is a command device 28, 30 is a speed controller 35 is a delay circuit 36 is a F / V The converters 38a and 38b are frequency dividers 40 are deviation counters 42 are D / A converters 44 are adders

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Shigeru Kuroda 1-chome, Kawasaki-dori, Mizushima, Kurashiki-shi, Okayama Pref. Kawasaki Steel Corporation Mizushima Works (56) References JP-A-5-161986 (JP, A JP-A-5-92283 (JP, A) JP-A-5-70883 (JP, A) JP-A-4-81205 (JP, A) JP-A-4-81204 (JP, A) 204103 (JP, A) JP-A-2-192807 (JP, A) JP-A-1-224187 (JP, A) JP-A-64-57905 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B21B 27/00 B23K 26/00

Claims (1)

(57) [Claims] 1. A high-density beam energy is passed through a passage hole formed in a rotating mechanical chopper to form a beam energy pulse, and the beam energy pulse is sent to the surface of the rotating roll in the roll axis direction. Irradiation while moving at a predetermined speed by a mechanism, and the microscopic irregularities formed by melting the roll surface with the beam energy pulse, the rolls in each row at a predetermined axial arrangement pitch in the roll axial direction. Are formed at a predetermined pitch in the circumferential direction in the circumferential direction, and the concavo-convex pattern composed of these microscopic concavities and convexities is arranged in the roll circumferential direction every predetermined n rows in the roll axis direction, and The roll circumferential direction array of adjacent rows between the n rows in the roll axis direction where coincidence is the roll dulling method in which a preset uniform or different phase difference is sequentially formed, A natural number corresponding to the pitch closest to the desired circumferential arrangement pitch is set as a natural number of concavities and convexities per rotation of the roll, and the chopper rotation phase and the roll rotational movement are synchronized with the set number of concavities and convexities. The chopper rotation speed command value and the roll rotation speed command value of the ratio are set, and the chopper movement speed command value at which the mechanical chopper moves in the roll axis direction by (n-1) times the axial arrangement pitch per roll rotation. Is set, and based on the chopper rotation speed command value, the roll rotation speed command value, and the chopper movement speed command value, the roll, the mechanical chopper and the feed mechanism are driven to form microscopic irregularities in the first row. After that, without changing the chopper rotation speed command value and the roll rotation speed command value of the integer ratio in which the chopper rotation phase and the roll rotation movement are synchronized, the feed mechanism is not changed. Further, the processing start point in the second row is shifted from the processing start point in the first row by the axial arrangement pitch in the roll axis direction, and the microscopic unevenness in the first row and the microscopic unevenness in the second row are shifted. A rotational phase shift of a mechanical chopper that satisfies a predetermined phase difference formed therebetween is set, and while controlling the rotational phase shift to be actually realized by the mechanical chopper, the chopper rotational speed command value and the roll rotational speed are controlled. A dull processing of a roll, characterized in that the mechanical chopper, the roll, and the feed mechanism are driven based on the command value and the chopper moving speed command value, and the above operations are sequentially repeated (n-1) times to form the uneven pattern. Method.