JP4584944B2 - Manufacturing method of flat wire - Google Patents

Description

  The present invention relates to a method for manufacturing a rectangular wire.

In a motor, a short cylindrical stator core made of a magnetic material has a number of concave slots and a number of convex magnetic poles arranged alternately (in the circumferential direction), and a magnet wire is wound around the magnetic poles. And a stator for generating a magnetic field is formed by being stacked in the slot.
In order for the motor to efficiently obtain a large rotational torque, it is necessary to increase the space factor (ratio of the volume occupied by the magnet wire) of the magnet wire in the slot (space). Also, a magnet wire (flat wire) having a rectangular cross section that can be wound densely (high space factor) is used.

  In addition, a stator core having a plurality of slots that are open on the inner peripheral surface side as a whole has a small width in a tapered manner from the bottom of the slot to the tip opening (trapezoidal dovetail). Therefore, in order to wind the magnet wire densely, it is necessary to periodically change the width dimension of the magnet wire in the longitudinal direction.

A rectangular wire in which such a width dimension changes periodically by increasing and decreasing periodically (every fixed length) in the longitudinal direction is a conventional manufacturing apparatus that forms a round wire into a rectangular wire (for example, Patent Documents). 1), the roll interval between the pair of rolling rolls can be approached and separated.
Further, in order to make the electric resistance uniform in a rectangular wire whose width dimension changes, it is desired to mold the cross-sectional area to be the same in the longitudinal direction.
JP 2004-122165 A

  However, the above method for producing a rectangular wire has a problem that the cross-sectional area of the rectangular wire changes depending on the rolling magnification. The data indicating this is shown in Table 1 below.

Table 1 shows data when a round wire having the same cross-sectional area is rolled into a flat wire in the longitudinal direction. In Table 1, in the portions where the rolling magnification is 8 times, 11.8 times, and 14.9 times, the respective cross-sectional areas are changed to 2.005 mm ² , 1.887 mm ² , and 1.817 mm ² . In the portion of 11.8 times and 14.9 times, it is reduced by about 10% from the predetermined cross-sectional area of 2 mm ² .
In Table 1, the percentage value in parentheses is the ratio of each cross-sectional area to the predetermined (desired) cross-sectional area of the rectangular wire, and the rolling ratio is “width dimension ÷ thickness dimension” of the produced rectangular wire. It is a calculated value.

  As can be seen from Table 1, the cross-sectional area of the portion became smaller as the rolling ratio increased (rolled larger), and the cross-sectional area could not be made the same in the longitudinal direction.

  Therefore, the present invention provides a manufacturing method capable of producing a cross-sectional area substantially the same (uniform) and continuously and efficiently even for a rectangular wire whose width and thickness dimensions change in the longitudinal direction. The purpose is to do.

In order to achieve the above object, a method for producing a rectangular wire according to the present invention is a method in which a metal wire is sent between first rolling rolls that are controlled to be relatively close to each other, and the thickness dimension changes periodically and continuously. The intermediate wire is formed, and subsequently, relative to the second rolling roll so that the second roll interval dimension is decreased / increased correspondingly to the increase / decrease of the thickness of the intermediate wire. The intermediate wire is fed to the second rolling roll while the intermediate wire is fed to the second rolling roll while the intermediate wire is fed to the second rolling roll while the final thickness and width are periodically and continuously changed in the longitudinal direction. In this method, the upper and lower limits of the thickness dimension of the intermediate wire are detected by an intermediate wire thickness measuring instrument before feeding, and an operation command for starting and decreasing the second roll interval dimension is issued.
Further, the moving speed of the intermediate wire fed from the first rolling roll is measured, and the interval fluctuation speed at which the first roll interval dimension of the first rolling roll increases / decreases is controlled to increase / decrease. Alternatively, the moving speed of the rectangular wire fed from the second rolling roll is measured, and the interval fluctuation speed at which the second roll interval dimension of the second rolling roll increases / decreases is controlled.
In addition, the final width dimension of the rectangular wire fed from the second rolling roll is measured, and when it is smaller than the target final width dimension, the first roll interval dimension of the first rolling roll is increased and corrected. In addition, it is desirable to perform feedback control so as to reduce and correct the first roll interval dimension of the first rolling roll when it is larger than the target final width dimension.

  According to the method for manufacturing a rectangular wire according to the present invention, a rectangular wire whose dimensions change continuously and periodically in the longitudinal direction is continuously manufactured while being controlled with high accuracy so that the cross section is uniform. be able to.

  FIG. 1 is an overall explanatory view for explaining a method of manufacturing a flat wire according to the present invention, FIG. 2 is an explanatory view of the main part thereof, and a left end 10 is a metal as a base material having a circular cross section such as copper. A supply drum around which a wire D is wound, and a right end 13 is a winding drum which winds up a manufactured flat wire (product) C. The metal wire D and the flat wire C are sent from the left to the right in FIG. In the middle of the supply drum 10 and the winding drum 13, the first rolling rolls A and A and the second rolling rolls B and B are sequentially installed from the upstream to the downstream. The first rolling rolls A and A and the second rolling rolls B and B are both relatively approached and separated, and the arrows Va and Vb are the first rolling rolls A and A and the second rolling rolls B and B, respectively. In this embodiment, only the upper rolls 1 and 2 of the pair of upper and lower first rolling rolls A and A and the second rolling rolls B and B are raised and lowered, and the arrow Va , Vb may be referred to as the moving speed of the first and second rolling rolls A and B (upper rolls 1 and 2). 14 is a tension adjusting device.

In FIG. 1, a metal wire (base material) D having the same circular cross section is fed out from a supply drum 10 in the longitudinal direction, supplied between first rolling rolls A and A that are relatively approached and separated, and rolled. As a result, an intermediate wire M is formed in which the thickness dimension and the width dimension change (in the longitudinal direction) periodically and continuously as shown in FIG. At a 2 and 3, the thickness T of the intermediate wire M at a predetermined pitch L ₁ is small → large, and, to a large → small, indicating that changing.

Next, the intermediate wire M is subsequently fed into the second rolling rolls B and B. The second rolling rolls B and B are relatively approached and separated so that the roll interval dimension is opposite to the thickness dimension T of the intermediate wire M that is fed. That is, the distance between the second rolling rolls B and B is controlled so as to decrease or increase conversely with the increase or decrease of the thickness dimension T of the intermediate wire M. Thus, the intermediate wire M is rolled by the second rolling rolls B and B, and the final thickness dimension and the final width dimension are periodically (over the longitudinal direction) as shown in FIG. And the rectangular wire C which changes continuously is manufactured.
In other words, as shown in FIGS. 3 (I) and (II), the intermediate wire M is rolled by the second rolling rolls B and B so that the thicker the thickness dimension T is, the thinner the portion becomes. Furthermore, the distance between the first rolling rolls A and A is roll-formed to a thickness dimension T opposite to the final thickness dimension of the flat wire C.

As shown in FIG. 3, the intermediate wire M has a temporary narrow width portion N ₁ having a large thickness dimension T and a small width dimension, and a temporary wide width portion W ₁ having a small thickness dimension T and a large width dimension, alternately. The rectangular wire C is periodically formed at a predetermined pitch L ₁ , and the flat wire C includes a final wide portion W ₂ having a small thickness dimension and a large width dimension, and a final narrow portion N ₂ having a large thickness dimension and a small width dimension. but periodically formed at a predetermined pitch L ₂ alternately.
Incidentally, as shown in FIG. 2, the second rolling roll B, the predetermined pitch L ₂ of the rectangular wire C passed through the B may pass before (intermediate wire M) than said predetermined pitch L ₁ (fully However, in FIG. 3 (and FIG. 6 to be described later), both pitches L ₁ and L ₂ are drawn to the same dimensions (temporarily) for explaining the correspondence between the narrow portion and the wide portion. .

Figure 4 is a diagram illustrating sequentially with cross flow of the rolling process for forming a metal line D to the intermediate wire through M rectangular wire C, (b), the metal lines D → provisional wide portion W ₁ → final A state of changing to the narrow portion N ₂ is shown, and (b) shows a state of changing from the metal line D → the temporary narrow portion N _{1 to the} final wide portion W ₂ . 4 (A) and 4 (B), (O) shows a cross section of the metal wire D before rolling, and (I) shows an intermediate wire M formed by rolling with the first rolling rolls A and A. (II) shows the cross section of the flat wire C formed by rolling with the second rolling rolls B and B.

As shown in FIGS. 1 and 2, thickness measuring devices S ₁ , S ₂ , S ₃ , S ₃ ′ and velocity measuring devices S ₄ , S ₅ are arranged. The position and operation of such arrangement will be described later.
In FIG. 5, the process of rolling (deformation) of the metal wire D → the intermediate wire M → the flat wire C is drawn together. The two-dot chain line is the upper edge of the metal wire D, and the one-dot chain line is the middle. The upper end edge (the pressing surface of the upper roll 2) of the wire M is shown, and a flat line C is shown by a solid line and a diagonal line. In addition, each lower end edge of the metal wire D and the intermediate | middle wire rod M is shown overlapping with the lower end edge of the flat wire C.

Also represent At a 5, a second rolling roll B, the time variation of the roll gap dimension X ₂ of B from right to left. In this way, the roll spacing dimension X ₂ is controlled to decrease as the thickness dimension of the intermediate wire M increases (from the right end toward the middle), and the thickness dimension of the intermediate wire M increases from the middle toward the left end. The roll interval dimension X ₂ is controlled to increase as it decreases.

Next, FIG. 6 shows another embodiment (instead of the embodiment of FIG. 3), and a “crossover portion 50” formed in the same cross-sectional shape over a short length on a flat wire C as a final product. Is provided. In addition, a crossover (planned) portion 52 is also formed on the intermediate wire M (if necessary). In this case, the pitch L ₁ of the intermediate wire M, and the pitch L ₂ of the rectangular wire C, as compared to FIG. 3, the transfer section 52, 50 by a length dimension of larger. This transition part 50 is a part that is not used in the finished product, but is necessary for manufacturing. For example, it is used as a holding allowance (grip allowance) when a long linear member (flat wire) is wound, It is used for extra cost for adjusting the height. To explain further, when the product is cut into a predetermined length and used as a finished product, a rectangular wire C that is many times longer than the predetermined length is manufactured, and then, when the predetermined length is cut, It can be cut at the crossover 50 to adjust the dimensions, or it can be used as a tool (tool) gripping allowance.

Next, FIGS. 7 and 8 are flowcharts mainly relating to the control of the first rolling roll A, and * 1 and * 2 in FIG. 7 are respectively connected to * 1 and * 2 in FIG. . 9 and 10 are flowcharts mainly relating to the control of the second rolling roll B, and * 3 and * 4 in FIG. 9 are respectively connected to * 3 and * 4 in FIG. The measurement value in the first thickness measuring device S ₁ is indicated as S _1, and the measurement value in the third thickness measuring device S ₃ is indicated as S ₃ in FIGS. It is possible in 10 drawings and in the following description. FIG. 11 is a flowchart showing the control of the moving speed Va of the first rolling roll A in FIGS. 1 and 2, and FIG. 12 shows the moving speed of the second rolling roll B in FIGS. It is a flowchart figure which shows control of Vb.

  The present invention is characterized in that the rectangular wire C whose dimension continuously changes in the length direction is controlled so as to make the cross-sectional area uniform. Hereinafter, the control method shown in FIGS. This will be described with reference to the flowchart diagram and FIGS.

In the control of the first rolling roll A, the upper limit value and the lower limit value of the thickness dimension T of the intermediate wire M are input and the timer is input (see step 21 of the setting in FIG. 7). That is, in the 1st rolling roll A, it controls so that the preset value 1 (proximity) and value 2 (separation) may operate | move periodically. How this control is a timer, the position of the upper roll 1, a first rolling roll A as measured by a thickness measuring device S ₁ of the intermediate wire M data input 22 (step 23) or the like, to close to or away from the roll gap of the A Do that. Thereby, the thickness dimension T of the intermediate wire M is periodically and alternately controlled from large (thick) → small (thin) → large (thick) → small (thin).

The intermediate wire thickness measuring device S ₁ (sometimes referred to as a first thickness measuring device) is installed immediately after the first rolling roller A. In order to keep the pitch L ₁ repeatedly (in the length direction) of the thickness dimension T constantly constant, the moving speed Va of the first rolling roll A (upper roll 1) is set to the moving speed (feed of the intermediate wire M). Link (related) to (speed). That is, FIG. 11, and the first rolling roll A, as shown in FIGS. 1 and 2, the moving speed Vm of the intermediate wire material M coming fed from A, measured by the speed measuring device S _4, the first rolling Increase / decrease control is performed on the interval fluctuation speed (movement speed) Va at which the first roll interval dimension of the rolls A and A increases / decreases. More specifically, in FIG. 11, in the setting step 40, the basic movement speed Va of the first rolling roll A (upper roll 1) is inputted and the movement of the first rolling roll A (not shown) is performed. Enter the basic frequency of the motor. In step 41, the moving speed measuring device S _4, the measurement data 42 of the moving speed Vm of the intermediate wire M is input, the next step 43, performs the operation of changing the frequency, based on the calculation result following In step 44, the moving speed Va of the moving motor is increased or decreased (proportional). As a result, the moving speed Va of the first rolling roll A (upper roll 1) is increased or decreased (proportional) (step 45).

Returning to FIG. 7, the position of the upper roll 1 (the distance between the first rolling rolls A and A) is determined in the next step 24 by the measurement data input 22 of the thickness measuring device S ₁ (as described above). It is confirmed whether the position is separated or close. In the separated state (the state in which the upper roll 1 is above), the process proceeds to step 25 to start the lowering of the upper roll 1 (proximity operation of the first rolling rolls A and A), and the preset time shown in step 26 After the elapse, the process proceeds to the next step 27 to stop the descent (proximity operation).

Therefore, as shown in FIG. 8, At a step 28, the first thickness measuring device S ₁ performed (left) measurement data input 22, in the next step 29, the data input 22 has been measured The value S ₁ is compared with the lower limit set value, and if the measured value S ₁ <the lower limit set value, the first roll 1 is raised and the interval between the first rolling rolls A is increased (step 30). After a predetermined time (timer 2) elapses, the process proceeds to stop step 31 and stops. In the next step 32, it is determined whether or not the time of the started timer (timer 3) has elapsed after the input 22 in step 28. If the time elapses, the process returns to immediately before step 23 (see arrow 46).

  On the other hand, if it is confirmed in step 24 that the position of the upper roll 1 (interval position between the first rolling rolls A and A) is close, the process proceeds to step 33 and the upper roll 1 starts to rise. After the predetermined time (timer 1) shown in step 34 has elapsed, the ascent is stopped (step 35).

Next, in step 28 in FIG. 8, the measurement data input 22 (on the right side) from the first thickness measuring device S ₁ is performed, and in the next step 36, the data input 22 is measured. by comparing the value S ₁ and the upper limit set number, in the case of the measured value S _1> upper limit setting numbers, first lowers the roll 1, to reduce the distance between the first rolling roll a (step 37). After a predetermined time (timer 2) elapses, the process proceeds to stop step 38 and stops. In the next step 39, it is determined whether or not the time of the started timer (timer 3) has elapsed after the input 22 in step 28. If the time elapses, the process returns to the straight line of step 23 (see arrow 46).

As described above, it is possible to recognize whether the upper roll 1 starts to rise or descend by using the first thickness measuring device S ₁ , the position of the upper roll 1, the gap, etc. This is shown in FIG. 7 and FIG.
The thickness dimension of the intermediate wire M changes due to the thermal expansion of the first rolling rolls A and A (upper roll 1), the change in frictional force, and the like. At this time, as described above, feedback control is performed by inputting the measurement result of the first thickness measuring device S ₁ (measurement data input 22), and the stop positions of the first rolling rolls A and A (upper roll 1) are set. Fine adjustment is made (steps 28 to 32 or steps 28 to 39).

Installation position of the first thickness measuring device S ₁ is the first rolling rolls A, but preferably is close to the exit of the A, in addition to this, for example, as shown in FIG. 2, the predetermined pitch L ₁ described above integer Double is also desirable. In addition, when this installation position is made into an appropriate position, the distance from the 1st rolling roll A to an installation position can also be input and calculated, and can also be controlled by timing. Moreover, the above-described control can be used not only for control of the rolling roll but also for roll forming and the like.

Next, as shown in the flowcharts of FIGS. 9 and 10, the second rolling roll B is controlled. First, an upper limit value, a lower limit value, and a timer are input for the thickness dimension of the flat wire (product) C (see step 53 in FIG. 9). That is, in the second rolling roll B, the preset value 1 (proximity) and value 2 (separation) are controlled so as to operate at a predetermined pitch L ₂ corresponding to the thickness dimension T of the intermediate wire M. For this control, a second thickness measuring device S ₂ is installed upstream of the second rolling roll B (before the rolling), and the thickness dimension T ( Position detection is performed when the intermediate wire M whose cross-sectional shape is changed enters the second rolling roll B. Or the intermediate wire thickness measuring device (second thickness measuring device) the installation position of S ₂ is the just before the intermediate wire M is rolled by the second rolling roll B, or, (described above) a predetermined pitch L The position is an integer multiple of ₁ . Alternatively, if the distance from the second rolling roll B is determined, the timing can be controlled (calculated). Step 57 of FIG. 9 At a step 58, on the basis of the measurement data of the second thickness measuring device S _2, and determines whether the initiation timing of the upper roller 2 descends. Alternatively, in step 57 to step 63, it is determined whether the upper roller 2 starts to rise. That is, the second rolling roll B, in the second thickness measuring device S ₂ before the feeding of B, and each detects the upper and lower limits of the thickness of the intermediate wire material M, the second rolling roll B, of B An operation command for starting (increase starting) or starting to decrease (start descending) of the interval dimension is issued.

Meanwhile, as shown in FIGS. 1 and 2, the third (flat wire) thickness measuring device S _3, previously installed downstream of the second mill roll B, At a step 54 shown in FIG. 9, the Transmit the thickness measurement data of the flat wire C 67 and confirm the ascending / descending position (interval size) of the upper roll 2 of the second rolling rolls B, B and prepare for descending in the next step 55, or In step 62, preparation for ascent is made.
That is, in step 55, when the thin portion of the intermediate wire M (portion where the thickness dimension T is small) is located immediately below the second rolling rolls B, B, the second rolling rolls B, B are in the raised position ( Therefore, the process proceeds to step 58 through step 56 (see FIGS. 5 and 6). In the opposite case, since the second rolling rolls B and B are in the lowered position (close state), the process proceeds to step 63 through step 62.

Second rolling roll B, the spacing dimension (elevation) Control of B (upper roll 2) is performed by an operation command from the second thickness measuring device S ₂ (step 57, 58, 59 or 57, 63, 64) However, the length in the feed direction is an operation at a preset position. The control is performed by setting the interval between the second rolling rolls B and B close to each other by a timer, the roll position of the upper roll 2, the thickness measurement of the intermediate wire M, and the like. Thereby, the thickness dimension of the flat wire C as a product can be periodically controlled alternately in the order of large (thick) → small (thin) → large (thick) → small (thin).
Since the pitch L ₂ (longitudinal direction) of repeating the thickness dimension of the flat wire C must be kept constant at all times, the interval fluctuation speed (moving speed) Vb of the second rolling roll B (upper roll 2) is set to be constant. , Link (relate) to the moving speed Vc of the flat wire C. That is, FIG. 12, and the second mill roll B as shown in FIG. 1 and FIG. 2, the moving velocity Vc of the coming fed rectangular wire C from B, measured by the speed measuring device S _5, the second rolling roll Increase / decrease control is performed on the interval fluctuation speed (movement speed) Vb at which the second roll interval dimension of B and B increases / decreases.

More specifically, in FIG. 12, in the setting step 70, the basic moving speed Vb of the second rolling roll B (upper roll 2) is inputted and the motor for moving the second rolling roll B (not shown) is inputted. Enter the fundamental frequency. In step 71, the moving speed measuring device S _5, the measurement data 72 of the moving velocity Vc of the flat wire C is input, the next step 73, performs the operation of changing the frequency, based on the calculation result following In step 74, the moving speed Vb by the moving motor is increased or decreased (proportional). Thereby, the moving speed Vb of the second rolling roll B (upper roll 2) is increased or decreased (in proportion) (step 75).
Incidentally, when the moving speed Vc is constant, and configured to adjust the second roll moving speed Vb by an inverter or the like, it may be controlled so as to maintain a predetermined pitch L _2.

Referring back to FIG. 9, the measurement data (signal 67) or the like (as previously described) thickness measuring instrument S _3, the next step 55, the position of the upper roll 2 ─── second rolling roll B , B is confirmed as to whether it is separated or close. In the separated state (state upper roll 2 is located above), a state of falling prepare proceeds to step 56, then a signal from the thickness measuring device S ₂ of the intermediate member M enters, step from step 58 59 Then, the upper roller 2 starts to descend, and after the preset time indicated in Step 60 has elapsed, the process proceeds to the next Step 61 to stop the lowering (proximity operation).

Therefore, At a step 74, the third thickness measuring device S ₃ (the left side) perform the measurement data input 75, in the next step 76 shown in FIG. 10, the data input 75 measurement values S ₃ is compared with the lower limit set value, and if the measured value S ₃ <the lower limit set value, the second roll 2 is raised and the interval between the second rolling rolls B is increased (step 80). After elapse of a predetermined time (timer 5), the process proceeds to stop step 81 and stops. In the next step 82, it is determined whether or not the timer (timer 6) has elapsed after the input 75 in step 74. If the time has elapsed, the process returns to immediately before step 54 (see arrow 86).

On the other hand, At a step 55, if it is confirmed that the position of the upper roll 2 is a close state, becomes elevated ready for step 62, then the signal from the thickness measuring device S ₂ of the intermediate member M enters Then, the process proceeds from step 63 to step 64, the upper roller 2 starts to rise, and after the preset time shown in step 65, the process proceeds to the next step 66 to stop the rise (separation operation). .

Then, At a step 74, the third thickness measuring instrument from S ₃ of (the right side) perform the measurement data input 75, at step 83 shown in the following figure 10, it is the data input 75 measurements The value S ₃ is compared with the upper limit set value, and if the measured value S ₃ > the upper limit set value, the second roll 2 is lowered and the interval between the second rolling rolls B is decreased (step 84). After a predetermined time (timer 5) elapses, the process proceeds to stop step 85 and stops. In the next step 88, it is determined whether or not the timer 6 that has started has elapsed after the input 75 in the right direction of step 74. If it is determined that the time has elapsed, the process returns immediately before step 54 (as indicated by arrow 86).

In this way, the start timing of the raising / lowering of the upper roll 2 is recognized by the third thickness measuring device S ₃ , the position of the upper roll 2, the gap, and the like, and it is determined whether to raise or lower. .
The thickness dimension of the flat wire C changes due to changes in the thermal expansion, frictional force, and the like of the second rolling rolls B and B (upper roll 2). In this case, as described above, by performing the third thickness measuring instrument measurement result of the input of the S ₃ (measurement data input 75) by the feedback control, the second rolling roll B, and the stop position of the B (upper roll 2) Fine adjustment is performed (steps 74, 76, 80 to 82, or steps 74, 83 to 85, 88).
(At a 2) the installation position of the third thickness measuring device S _3, the second rolling rolls B, and preferable to close the outlet of B, and addition to this, an integral multiple of the predetermined pitch L ₂ It is also desirable. In addition, when installing in an appropriate position, it is also possible to recognize the distance to the 2nd rolling rolls B and B, and to control by timing.

  By the way, when the crossover portion 50 is formed as shown in FIG. 6, the stop time of each of the rollers A, A; B, B at the upper limit and the lower limit is appropriately set long in the above-described control. Good.

Next, as shown in FIGS. 1 and 2, a width measuring device S ₃ ′ for measuring the final width dimension of the flat wire C is installed at the same position as the third thickness measuring device S ₃ , for example. It is also desirable to adjust the final width dimension by feeding back the measurement data of the measuring instrument S ₃ ′ (step 89 in FIG. 7) to the first rolling rolls A and A. More specifically, in FIG. 1, FIG. 2 and FIG. 7, the final width dimension of the flat wire C fed from the second rolling rolls B, B is measured by the measuring instrument S ₃ ′ (see step 89). Next, in step 90, it is determined whether or not the final width dimension (also simply referred to as product width) of the flat wire (product) C is too small. If it is too small, the process proceeds to the next step 91, and the signal 92 for upwardly correcting the set values of the upper limit and the lower limit is feedback controlled to the first rolling rolls A and A.

On the other hand, if the product width is not too small in step 90, it is determined in next step 93 whether the product width (final wire final width dimension) is excessive. In the next step 94, the second rolling rolls A and A are feedback-controlled with a signal 95 for downwardly correcting the upper limit / lower limit set values.
In other words, the metal wire D is sent between the first rolling rolls A and A that are controlled relatively close to each other to form an intermediate wire M in which the thickness dimension changes periodically and continuously, and subsequently, While relatively controlling the distance between the second rolling rolls B and B so as to decrease or increase the distance between the second rolls correspondingly to the increase or decrease of the thickness of the intermediate wire M, The intermediate wire M is fed to produce a rectangular wire C in which the final thickness dimension and the final width dimension change periodically and continuously in the longitudinal direction, and the intermediate wire M is applied to the second rolling rolls B and B. and each detecting upper and lower limit of the thickness of the intermediate wire M at an intermediate wire material thickness measuring device S ₂ before the feeding performing the operation command starts increasing or decreasing the beginning of the second roll gap dimensions.
In this way, the first rolling rolls A and A and the second rolling rolls B and B are controlled based on the thickness dimension in the two-stage rolling, and finally the width dimension is measured and the first rolling roll A, A and the second rolling roll B, B are measured. The final width dimension of the flat wire C can be controlled with high accuracy by feeding back to the rolling rolls A and A and increasing or decreasing the cross-sectional area with the first rolling rolls A and A.

In addition to the embodiment of the present invention is described above implemented, a free design change, for example, in place of the position detection using a second thickness measuring device S _2, the rolling roll A, the installation distance between B By always keeping it constant, control at timing is possible. As an example, a method in which the first rolling rolls A and A are made non-driving rolls and drawn by the second rolling rolls B and B can be mentioned. According to this method, the control can be further simplified.

  The present invention is a manufacturing method that performs the control as described above, but the flat wire C as a product has a uniform cross-sectional area in the longitudinal direction, uniform electrical resistance as a motor magnet wire, and excellent quality. Can be manufactured continuously.

In the manufacturing method for controlling the above according to the present invention, FIG. 4 (a) as indicated by the compression of the (b) from (O) to (I), a metal wire D of diameter r, thickness T ₁ provisional the wide portion W _1, is provisionally narrow portion N ₁ and the compression of the thickness T ₁₀ (rolling) of. As can be seen from the figure, the thickness dimension T ₁ is smaller than the thickness dimension T ₁₀ , in other words, the compression amount (rolling ratio) from the metal wire D is the provisional wide portion W ₁ is the provisional narrow portion. Since it is larger than N ₁ , the cross-sectional area Z ₁ of the temporary wide portion W ₁ is smaller and smaller than the cross-sectional area Z ₁₀ of the temporary narrow portion N ₁ .

Then, the compression of FIG. 4 (a) (ii) of (I) to (II), the amount of compression of the thickness dimension T ₁₀ to T ₂ are, than the compression amount from the thickness T ₁ to T ₂₀ large. That is, when the cross-sectional area that satisfies the relationship of Z ₁ <Z _{10 in} the state (I) is compressed to the state (II), the cross-sectional area Z ₁₀ is smaller than Z _1. can be adjusted and the cross-sectional area Z ₂ of the cross-sectional area of the narrow portion N ₂ Z ₂₀ and the final wide portion W ₂ to be the same (substantially the same).
Further, when comparing the final thickness dimensions T ₂₀ and T ₂ of the flat wire C in (II) and (II) of (II), the cross-sectional area Z is different although the cumulative compression amount from the metal wire D is different. ₂₀ and Z ₂ can be made substantially the same from (I) to (I) because of the cross-sectional area reduction rate (the cross-sectional area reduction amount per unit compression amount) when compressing from (O) to (I). This is because the cross-sectional area reduction rate (the cross-sectional area reduction amount per unit compression amount) when compressing to II) is smaller.

  In FIG. 5, the changes in the vertical direction (O) → (I) → (II) in (A) and (B) are as follows: (O) → (I) → This is shown in correspondence with the change in (II). As shown in FIG. 5, the compression from (I) to (II) in (B) changes the most. (B) In the case of (O) → (II), the compression from (O) → (II) greatly affects the reduction of the cross-sectional area. In the present invention, the cross-sectional area reduction rate when compressing from (I) to (II) is smaller than the cross-sectional area reduction rate when compressing from (O) to (I). ), The reduction of the cross-sectional area is suppressed even if the compression is greatly performed, and as a result, the state (II) and the cross-sectional area are made substantially the same. In other words, the portion to be largely rolled is rolled with the second rolling rolls B and B, so that the reduction of the cross-sectional area is suppressed and the cross-sectional area of the rectangular wire C is made substantially the same in the longitudinal direction.

The reason why the cross-sectional area reduction rate is different between (O) → (I) and (I) → (II) will be described.
In FIG. 4, when compressing from (O) to (I), since the flat roll pressing surface 3 is formed on the metal wire D having a circular cross section, the first rolling rolls A and A are passed through. The resistance is great. On the other hand, when compressing from (I) to (II), since the roll pressing surface 3 is already formed on the intermediate wire M, the intermediate wire M passes between the second rolling rolls B and B. The resistance is small and it is easier to pass than the first rolling rolls A and A.

That is, the metal wire D is difficult to cross between the first rolling rolls A and A (is difficult to pass), and the amount of reduction in the cross-sectional area when passing is increased. On the other hand, the intermediate wire M tends to smoothly pass between the second rolling rolls B and B, and the amount of reduction in the cross-sectional area when passing is small.
Thus, the cross-sectional area reduction rate (the cross-sectional area reduction amount per unit compression amount) at the time of rolling of the metal wire (intermediate wire M) of the second rolling rolls B and B is the metal wire of the first rolling rolls A and A. It becomes smaller than the cross-sectional area reduction rate (the cross-sectional area reduction amount per unit compression amount) during rolling of the (metal wire D).

  In the manufacturing method of the present invention, the cross-sectional area of the product (flat wire C) can be made uniform in the longitudinal direction by skillfully utilizing such a principle.

In the present invention, as described above, the metal wire D is fed between the first rolling rolls A and A that are relatively approached and separated to form the intermediate wire M whose thickness dimension changes periodically and continuously. Subsequently, the second roll rolls B and B are relatively close to each other so that the second roll interval dimension is decreased or increased in response to the increase or decrease in the thickness dimension of the intermediate wire M. While controlling the separation, the intermediate wire M is fed to produce a flat wire C in which the final thickness dimension and the final width dimension change periodically and continuously in the longitudinal direction, and to the second rolling rolls B and B. Before the feeding of the intermediate wire M, the upper and lower limits of the thickness dimension of the intermediate wire M are detected by the intermediate wire thickness measuring device S _{2 to} start the increase and decrease of the second roll interval dimension. Since this is a method of commanding, a flat surface with substantially the same cross-sectional area in the longitudinal direction is used. Line, a continuously and efficiently be manufactured. For example, it can contribute to the realization of a high-performance motor as a magnet wire. In particular, a rectangular wire whose thickness dimension and width dimension change periodically can be easily manufactured with high accuracy and continuously.

Also, the moving speed Vm of the intermediate wire M fed from the first rolling rolls A and A is measured, and the interval fluctuation speed Va at which the first roll interval dimension of the first rolling rolls A and A increases / decreases. by increasing or decreasing control, it is varied the feed (moving) speed of the longitudinal direction in a stable manner, at precise pitch L _2, flat wire C the cross-sectional shape changes can be obtained.
Further, the moving speed Vc of the rectangular wire C fed from the second rolling rolls B and B is measured, and the interval fluctuation speed Vb at which the second roll spacing dimension of the second rolling rolls B and B increases / decreases. by increasing or decreasing control, it is varied the feed (moving) speed of the longitudinal direction in a stable manner, at precise pitch L _2, flat wire C the cross-sectional shape changes can be obtained.

  The final width dimension of the flat wire C fed from the second rolling rolls B and B is measured, and when the final width dimension is smaller than the target final width dimension, the first roll interval dimension of the first rolling rolls A and A is determined. The first stage and the second stage are corrected by increasing and reversely controlling so that the first roll interval dimension of the first rolling rolls A and A is decreased when it is larger than the target final width dimension. By controlling the thickness dimension, measuring the width dimension at the final stage, increasing or decreasing the thickness of the first rolling rolls A, A, increasing or decreasing the first stage intermediate wire cross-sectional area, the final product ( The cross-sectional shape of the flat wire C) can be easily controlled with high accuracy.

It is a simplified explanatory view of one embodiment of the present invention. It is structure explanatory drawing of the principal part. It is a perspective view for explanation, (I) is a perspective view of an intermediate wire, and (II) is a perspective view of a flat wire. It is principal part sectional drawing. It is a schematic diagram for description of the plastic deformation by rolling. It is a perspective view for explanation showing other embodiments. It is a flowchart figure of control of a 1st rolling roll. It is a flowchart figure of control of a 1st rolling roll. It is a flowchart figure of control of a 2nd rolling roll. It is a flowchart figure of control of a 2nd rolling roll. It is a flowchart figure. It is a flowchart figure.

Explanation of symbols

A 1st rolling roll B 2nd rolling roll C Flat wire (product)
D Metal wire (base material)
M Intermediate wire S _2nd thickness measuring device (intermediate wire thickness measuring device)
S ₃ 'Width measuring device S ₄ , S ₅ Moving speed measuring device T Thickness dimension Va, Vb Interval variation speed (moving speed)
Vc, Vm Movement speed (feed speed)

Claims (4)

Sending the metal wire (D) between the first rolling rolls (A) and (A) that are controlled relatively close to each other to form an intermediate wire (M) whose thickness dimension changes periodically and continuously, Subsequently, the second roll interval dimension is decreased / increased between the second rolling rolls (B) / (B) correspondingly to the increase / decrease of the thickness dimension of the intermediate wire (M). The intermediate wire (M) is fed while relatively approaching and separating, and a rectangular wire (C) in which the final thickness dimension and the final width dimension change periodically and continuously in the longitudinal direction is manufactured. respectively upper and lower limit of the thickness of the intermediate wire (M) at an intermediate wire material thickness measuring device (S ₂₎ in front of the infeed of 2 rolling roll (B) the intermediate wire to (B) (M) A method of manufacturing a rectangular wire, characterized by detecting and issuing an operation command to start increasing / decreasing the second roll interval dimension .   The moving speed (Vm) of the intermediate wire (M) fed from the first rolling roll (A) (A) is measured, and the first roll interval dimension of the first rolling roll (A) (A) is determined. 2. The method for producing a rectangular wire according to claim 1, wherein the increasing and decreasing interval fluctuation speed (Va) is controlled to increase or decrease.   The moving speed (Vc) of the flat wire (C) sent out from the second rolling rolls (B) and (B) is measured, and the second roll interval dimension of the second rolling rolls (B) and (B) is determined. The method for producing a rectangular wire according to claim 1 or 2, wherein the increasing / decreasing interval fluctuation rate (Vb) is controlled to increase or decrease.   When the final width dimension of the rectangular wire (C) fed from the second rolling roll (B) (B) is measured and smaller than the target final width dimension, the first rolling roll (A) (A ) Is increased and the feedback control is performed so as to decrease and correct the first roll interval of the first rolling rolls (A) and (A) when the first roll interval is larger than the target final width. The manufacturing method of the flat wire of Claim 1, 2 or 3.

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