JP2015109167A - Method for manufacturing coating wire material, and wire material coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a coating wire material suppressed in thickness deviation.SOLUTION: A method for manufacturing a coating wire material 200 by using an extrusion head 10 which has an inner die 12 for leading a core material 200c so as to run along the shaft, and an outer die 11 for forming between the inner die 12, a cyclic gap 10p for supplying a material for coating the core material 200c includes: a step of measuring a surface position Lc of the core material 200c supplied to the extrusion head 10, and a surface position Lr of the running coating wire material 200 discharged from the extrusion head 10; a thickness deviation evaluation step of calculating thicknesses t1 and t2 of a coating film 200r from the surface position data of the core material 200c and the coating wire material 200, and evaluating whether there is thickness deviation or not on the coating film 200r; and a die positioning adjustment step of adjusting a relative position of the outer die 11 to the inner die 12 in a direction perpendicular to the shaft when it is evaluated that there is thickness deviation.

Description

  The present invention relates to a method of manufacturing a coated wire in which a core material is covered with a coating film such as a resin, and a wire coating apparatus.

  An extrusion molding apparatus used when coating a wire is an apparatus for extruding a resin material from a die after melting and plasticizing the resin material with an extruder. Among them, in a die that manufactures a continuous molded product such as a wire rod, the inner mold and the outer mold are arranged concentrically, and the resin material is pushed out from the gap between the inner mold and the outer mold. On the other hand, the wire manufactured using the forming apparatus can be classified into a hollow material such as a tube and a solid material such as an electric wire. A hollow molded product is obtained by extruding the resin material from the gap between the inner mold and the outer mold, and a solid molded product is obtained by the inner mold restraining the core and sending and molding together with the resin material.

  At this time, if a deviation occurs between the shafts of the inner mold and the outer mold, uneven thickness is generated in the molded product. Therefore, it is necessary to adjust the position of the mold in order to keep the outer mold and the inner mold concentric. Although it is necessary to determine the presence or absence of uneven thickness for adjustment, conventionally, the extruded molded product is cut with a knife or the like, and the cross-sectional shape is observed. Further, the position of the mold is adjusted sensuously by hand, and the time required for the work differs depending on the uneven thickness state and the skill of each worker.

  Therefore, an uneven thickness measuring device (for example, refer to Patent Document 1) that photographs the cut surface of the molded product and inspects the thickness deviation by image processing, or a probe is applied from the cut surface of the molded product. An apparatus (for example, see Patent Document 2) that detects the position of the peripheral surface and detects the uneven thickness has been proposed.

Japanese Unexamined Patent Publication No. 2000-9436 (paragraphs 0014 to 0018, FIGS. 1 and 6) JP 2012-91340 A (paragraphs 0029 to 0044, FIGS. 4 to 6)

  However, in any apparatus, the thickness deviation cannot be measured unless the molded product is cut, and the thickness deviation state during molding cannot be grasped. Therefore, even if uneven thickness occurs, it cannot be detected and adjusted immediately, and it is difficult to prevent the occurrence of uneven thickness.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain a coated wire material in which uneven thickness is detected during molding and the uneven thickness is suppressed.

  The method for manufacturing a coated wire according to the present invention supplies a cylindrical inner mold that guides a core material so as to travel along an axis, and a material that is arranged concentrically with the inner mold and covers the core material. A method of manufacturing a coated wire using a molding die having an outer mold for forming an annular gap for discharging, and a surface position of a core material supplied to the molding die and discharged from the molding die From the step of measuring the surface position of the coated wire and the surface position data of the core material and the coated wire, the thickness of the coated film is calculated, and whether the coated film is uneven or not is evaluated. A meat evaluation step, and a die position adjustment step of adjusting a relative position of the outer die with respect to the inner die in a direction perpendicular to the axis when it is evaluated that there is the uneven thickness.

  A wire covering apparatus according to the present invention is arranged to be concentric with a cylindrical inner mold that guides a core material so as to travel along an axis, and to supply a material that covers the core material. A mold provided with an outer mold that forms an annular gap, a mold position adjusting unit that adjusts a relative position of the outer mold with respect to the inner mold in a direction perpendicular to the axis, and is supplied to the mold From the data on the surface position of the core material, the surface position measuring unit for measuring the surface position of the coated wire material that is formed with the coating film and discharged from the mold, and the surface position data of the core material and the coated wire material, An unevenness evaluation unit that evaluates whether or not the coating film is uneven, and if it is evaluated that there is an unevenness, controls the operation of the apparatus to perform adjustment by the mold position adjustment unit And an operation control unit.

  According to this invention, since the uneven thickness of the coating film can be detected and accurately adjusted during the production of the coated wire, it is possible to obtain the coated wire with the uneven thickness suppressed.

It is a side cross-sectional schematic diagram for demonstrating the structure of the wire rod coating | coated apparatus concerning Embodiment 1 of this invention. It is a functional block diagram for demonstrating the structure of the thickness adjustment apparatus which is a part of wire rod coating | coated apparatus concerning Embodiment 1 of this invention. It is a figure for demonstrating the structure of the surface position measurement part which is a part of thickness deviation adjusting apparatus in the wire coating apparatus concerning Embodiment 1 of this invention, and the relationship between the surface position data of the measured wire, and coating thickness. It is a flowchart for demonstrating the method to adjust the thickness of the wire in the manufacturing method of the wire coating apparatus and wire concerning Embodiment 1 of this invention. It is a schematic diagram which shows the structure of the type | mold position adjustment part which is a part of a shaping | molding die and a thickness adjustment apparatus in the wire rod coating apparatus concerning Embodiment 2 of this invention. It is a figure for demonstrating the structure of the surface position measurement part which is a part of thickness variation adjusting apparatus, and the surface position data of the wire to measure in the wire covering apparatus concerning Embodiment 2 of this invention. It is a figure for demonstrating the structure of the surface position measurement part which is a part of thickness deviation adjusting apparatus in the wire coating | coated apparatus concerning Embodiment 3 of this invention. It is a figure for demonstrating the surface position data obtained in the surface position measurement part which is a part of thickness deviation adjusting apparatus in the wire coating | coated apparatus concerning Embodiment 3 of this invention. In the wire covering apparatus and the wire manufacturing method according to the third embodiment of the present invention, it is a diagram for explaining two methods of calculating the center position of the wire using the obtained surface position data. It is a figure for demonstrating the method of evaluating uneven thickness using the obtained surface position data in the manufacturing method of the wire coating | coated apparatus and wire which concern on Embodiment 3 of this invention.

Embodiment 1 FIG.
FIGS. 1-4 is a figure for demonstrating the manufacturing method and wire-coating apparatus of the covering wire concerning Embodiment 1 of this invention. FIG. 1 is a schematic side sectional view of a cutting surface including a shaft of an extrusion molding machine that is a main component of the wire coating apparatus, and FIG. 2 is a function for explaining the configuration of a thickness adjusting apparatus that is a part of the wire coating apparatus. It is a block diagram. FIG. 3 is a diagram for explaining the relationship between the configuration of the surface position measuring unit, which is a part of the thickness adjusting device, the surface position data of the wire measured by the surface position measuring unit, and the coating thickness. 3 (b) and 3 (b) show the structures of the upstream and downstream surface position measuring units forming the surface position measuring unit and the obtained surface position data, respectively, and FIG. 3 (c) shows the obtained surface position data. It is a figure explaining the relationship between a coating thickness. FIG. 4 is a flowchart including an operation and a data flow for explaining a method of adjusting the thickness of the wire.

  As shown in FIG. 1, a wire coating apparatus 100 according to a first embodiment of the present invention extrudes an extrusion head 10 that is a mold and a resin material 300 that is a coating material that becomes a coating film 200r. This is a so-called extrusion apparatus having an extruder 20. The core material 200c continuously supplied to the extrusion head 10 is coated with the resin material 300, and the coated wire 200 having the coating film 200r having a predetermined thickness can be manufactured. The feature of the wire coating apparatus 100 according to the first embodiment is based on the surface position data of the core material 200 c supplied to the extrusion head 10 and the surface position data of the coated wire 200 discharged from the extrusion head 10. The thickness (coating thickness t) of the coating film 200r is calculated, the uneven thickness is evaluated, and the positional relationship of the die of the extrusion head 10 is adjusted so as to suppress the uneven thickness based on the evaluated uneven thickness. The meat adjustment device 50 (FIG. 2) is provided. Details will be described below. In the present specification, the core material 200c and the covered wire material 200 may be simply referred to as a wire material without being distinguished from each other.

  In the extrusion head 10, each member is basically arranged concentrically so that the core material 200 c or the covered wire material 200 flows (runs) along the axis. The inner mold holder 14 and the inner mold 12 have a cylindrical shape, and are configured so that the core material 200c is passed through the inside and delivered together with the coating film 200r. The inner mold 12 and the outer mold 11 are dies for defining the thickness (coating thickness t) of the coating film 200r of the coated wire 200 and the cross-sectional shape, and the inner mold 12 and the outer mold 11 are interposed via the inner mold holder 14 and the outer mold holder 13, respectively. The inner cylinder 16 and the outer cylinder 15 are arranged concentrically. The inner mold 12 is fixed to the downstream end of the inner mold holder 14. The inner mold holder 14 is inserted into the inner cylinder 16 from the upstream side and fixed to the inner peripheral surface thereof. Further, the inner cylinder 16 is inserted into the outer cylinder 15 from the upstream side and fixed to the inner peripheral surface thereof. The outer mold 11 is fixed to the inner peripheral surface of the outer mold holder 13, and the outer mold holder 13 is disposed at the downstream end of the outer cylinder 15 with a gap between the outer mold 11 and the inner mold 12.

  In the extrusion head 10, an outer die 11 and an inner die 12 that are concentrically arranged form a passage 10 p that is annular and tapers from the outer diameter side toward the center as it goes from downstream to upstream. Yes. The extruder 20 has a screw 22 disposed inside a cylinder 21, and is supplied from a hopper or the like (not shown) and kneaded molten resin material 300, and then extruded into the passage 10 p of the extrusion head 10. The resin material 300 supplied from the extruder 20 moves to the center through the passage 10p, passes between the inner mold 12 and the outer mold 11, and goes out of the extrusion head 10.

  As a result, the surface of the core material 200 c supplied to the extrusion head 10 is covered with the coating film 200 r having the coating thickness t defined by the positional relationship between the outer mold 11 and the inner mold 12 and is discharged as the coated wire 200. . Then, as shown in FIG. 2, in order to measure the coating thickness t of the manufactured coated wire 200, a surface position measuring unit 40F arranged on the upstream side of the extrusion head 10 and a surface position measuring unit arranged on the downstream side A surface position measuring unit 40 having 40B is provided. The upstream surface position measuring unit 40F measures the surface position data of the core material 200c supplied to the extrusion head 10, and the downstream surface position measuring unit 40B is the surface of the coated wire 200 discharged from the extrusion head 10. Measure position data.

  On the other hand, in order to adjust the die position by displacing the relative position of the outer die 11 (center) with respect to the inner die 12 (center) in a plane perpendicular to the axis, the adjustment bolt 31 and the motor 32 that rotationally drives the adjustment bolt 31 are adjusted. A mold position adjusting unit 30 is provided. The mold position adjusting unit 30 displaces the relative position of the outer mold 11 with respect to the inner mold 12 by tightening one of the opposing adjustment bolts 31 and loosening the other.

  Then, from the surface position data of the core material 200c obtained from the surface position measuring unit 40 and the surface position data of the covered wire 200, the thickness (covering thickness t) of the coating film 200r is calculated, and the deviation (unevenness) is calculated. An uneven thickness evaluation unit 51 to be evaluated, and a displacement amount control unit 52 that controls the operation of the motor 32 as a displacement amount of the outer mold 11 relative to the inner mold 12 according to the evaluation result of the uneven thickness evaluation unit 51 are provided. . Thus, in other words, in the wire rod coating apparatus 100 according to the first embodiment, the thickness adjustment device 50 including the surface position measurement unit 40, the thickness evaluation unit 51, the displacement amount control unit 52, and the mold position adjustment unit 30. The thickness of the coated wire 200 can be adjusted in real time during molding.

  The surface position of the wire measured by the surface position measuring unit 40 is a position facing each other across the axis, and the direction around the axis is the displacement direction of the outer mold 11 relative to the inner mold 12 in the mold position adjusting unit 30. To match. That is, in FIG. 1 to FIG. 3, the beam direction of the laser displacement meter 41 is the vertical direction for the convenience of describing the paper surface, but it is actually the horizontal direction.

Next, the operation of the above-described wire covering apparatus 100, that is, the method for manufacturing the covered wire will be described with reference to the flowchart of FIG.
In addition, in the manufacturing method of the coated wire, the process itself of coating the surface of the core material with the resin material is the same as the coating by general extrusion molding, and has already been shown in the description of the wire coating apparatus 100 described above. The explanation is omitted. Therefore, hereinafter, the surface position detection process, the coating thickness calculation process, the uneven thickness evaluation process, and the uneven thickness adjustment process, which are features of the method for manufacturing the coated wire according to the first embodiment, will be described.

  In the surface position detection step (step S10 in FIG. 4), an operation when the laser displacement meter 41 is used for the surface position measurement units 40F and 40B will be described. In the surface position detection process, as shown in FIGS. 3A and 3B, the position of the object blocking between the light projecting unit 41e and the light receiving unit 41s is measured from the reference block 42 at the common position as a starting point. To do. In the laser displacement meter 41 arranged on the upstream side of the extrusion head 10, the distance Lpc from the reference block 42 of the outer diameter of the core material 200c before coating to the nearest (proximal) surface position and the farthest (distal) surface position The distance Ldc is detected, and the laser displacement meter 41 arranged on the downstream side similarly detects the distance to the surface position of the coated wire (covered wire 200) as Lpr and Ldr.

  The measuring means is not limited to the laser displacement meter as long as the surface (outer shape) position can be measured. For example, the outer position may be determined using a probe that physically contacts the surface of the wire. A contact-type displacement meter such as a probe can be measured without the influence of fine deposits that tend to cause noise compared to a non-contact displacement meter such as a laser displacement meter.

In the coating thickness calculation step (step S20 in FIG. 4), calculation is performed using the position information detected in the position detection step. When the voltage output corresponding to the surface position output from the laser displacement meter 41 is transmitted to the uneven thickness evaluation unit 51, the uneven thickness evaluation unit 51 converts the voltage into a digital value, as shown in FIG. Get location information. Then, as data of at least two coating thicknesses, the coating thickness t1 closer to the reference block 42 and the coating thickness t2 farther from the reference block 42 are calculated as shown in the equation (1).
t1 = Lpc−Lpr, t2 = Ldr−Ldc (1)

In the uneven thickness evaluation step (step S30 in FIG. 4), the uneven thickness evaluation unit 51 uses the calculated coating thicknesses t1 and t2 in at least two places, and the uneven thickness of the coating film 200r in the coated wire 200 that is a molded product. To evaluate. For example, as shown in the equation (2), the thickness deviation amount Ut is calculated from the difference in the coating thickness at the locations (two locations) facing each other across the shaft, and the calculated thickness deviation amount Ut is determined (stored). E) Unevenness is evaluated based on whether or not it is larger than the threshold value Th.
Ut = | t1-t2 |> Th (2)

When the uneven thickness amount Ut is larger than the threshold Th, it is determined that there is an uneven thickness, and the mold position adjustment amount Vm is calculated as shown in Expression (3).
Vm = k (t1-t2) (3)
Here, k is a predetermined constant, and is set to 0.5 in the present embodiment.

However, for calculating the uneven thickness amount Ut and the adjustment amount Vm, the coating thicknesses t1 and t2 need to be data for the same portion in the axial direction of the core member 200c. Therefore, not the data acquired at the same time, but the upstream surface position data (Lpc, Ldc: collectively Lc), the downstream surface position data (Lpr, Ldr: collectively Lr) is expressed by equation (4). The measured value acquired after time Td [sec] shown in FIG.
Td = D / V (4)
In Formula (4), the distance in the axial direction (wire travel route) of the surface position measurement units 40F and 40B is D [mm], and the line speed at which the wire (core material 200c) travels is V [mm / sec]. .

  If it is determined in step S30 that there is uneven thickness, the process proceeds to the uneven thickness adjustment step (step S40 in FIG. 4). In the uneven thickness adjustment process, the uneven thickness evaluation unit 51 transmits information indicating whether adjustment is necessary and the adjustment amount Vm to the displacement amount control unit 52. In the displacement amount control unit 52, the relative position of the outer die 11 with respect to the inner die 12 is feedback controlled by instructing the motor 32 the direction of tightening or loosening the adjusting bolt 31 and the amount thereof according to the adjustment amount Vm. This eliminates uneven thickness.

  In the first embodiment and the subsequent embodiments, the example in which the uneven thickness evaluation step is executed by the uneven thickness evaluation unit 51 has been described. However, the present invention is not limited to this and is executed by the displacement amount control unit 52. You may do it. Further, the uneven thickness evaluation unit 51 and the displacement amount control unit 52 are not necessarily separate, and may be performed within one control unit. Further, in order to simplify the description, an example in which the uneven thickness is evaluated based on whether the uneven thickness amount Ut exceeds the threshold Th has been shown, for example, based on the amount of change in the uneven thickness amount Ut over time. It is also possible to predict the occurrence of this, that is, to evaluate the signs of uneven thickness. In the feedback control, the absolute value of the adjustment amount of the adjustment bolt is not necessarily changed according to the adjustment amount Vm, and may be changed at a constant value.

  Furthermore, in this Embodiment 1 and subsequent embodiment, it demonstrates by performing all the uneven thickness evaluation processes and the uneven thickness adjustment processes automatically, However, it is not restricted to this. For example, in the uneven thickness evaluation process (or the operation of the uneven thickness adjusting device 60), when it is determined that there is uneven thickness, the presence of uneven thickness, or in addition to that, the displacement direction and amount are displayed. The adjustment process may be performed manually. Needless to say, the material of the coating film 200r is not limited to resin, and other materials are also applicable.

  In other words, since the thickness deviation of the coated wire 200 during molding can be evaluated in real time, the presence or absence of signs of uneven thickness or thickness deviation is determined (evaluated) with respect to the coated wire 200 without delay. Mold position adjustment can be executed without delay. Furthermore, since it comprised so that a die position might be adjusted in real time according to a thickness deviation evaluation result, the covering wire 200 which suppressed thickness deviation can be obtained. In the present embodiment and the following embodiments, the thickness deviation is basically evaluated based on the difference in thickness between different portions in the circumferential direction. However, the present invention is not limited to this. For example, if the average value of the thickness in the circumferential direction is constant and it is known that the center position of the wire does not deviate from the axis, if only one thickness in a certain direction is known, whether or not there is uneven thickness in that direction Can be evaluated.

  As described above, according to the method for manufacturing the coated wire 200 according to the first embodiment, the cylindrical inner mold 12 that guides the core material 200c so as to travel along the axis, and the inner mold 12 are concentric. And the outer die 11 that forms an annular gap (passage 10p) for supplying a material (resin material 300) that covers the core material 200c. In which the surface position Lc of the core material 200c supplied to the mold (extrusion head 10) and the surface position Lr of the coated wire material 200 discharged from the mold (extrusion head 10) are measured. Then, the thicknesses t1 and t2 of the coating film 200r are calculated from the surface position data of the core material 200c and the coated wire material 200, and it is evaluated whether or not the coating film 200 has an uneven thickness Ut (greater than the threshold Th). Uneven thickness evaluation process and Uneven thickness U If it is evaluated that there is a mold position adjusting step for adjusting the relative position of the outer mold 11 with respect to the inner mold 12 in the direction perpendicular to the axis, the coated wire 200 is being manufactured (during molding). ) Can detect the uneven thickness Ut of the coating film 200r and can adjust the thickness accurately, so that the coated wire 200 that suppresses the uneven thickness Ut can be obtained.

  In particular, in the uneven thickness evaluation step, the thickness of a plurality of locations in the circumferential direction of the coating film 200r is calculated, and whether or not the coating film 200r has the uneven thickness Ut is evaluated based on the calculated thicknesses of the plurality of locations. Therefore, even if the center position of the wire is shifted, the uneven thickness can be accurately evaluated.

  The molding die (extrusion head 10) is provided with a die position adjusting unit 30 that adjusts the relative position of the outer die 11 with respect to the inner die 12 in the direction perpendicular to the axis. Since the operation of the mold position adjusting unit 30 is automatically controlled based on the evaluation result of “No”, the high-quality coated wire rod 200 can be manufactured with no time loss and while maintaining productivity.

  As described above, according to the wire covering apparatus 100 according to the first embodiment of the present invention, the cylindrical inner mold 12 that guides the core material 200c so as to travel along the axis, and the inner mold 12 are concentric. And a molding die (extrusion head 10) provided with an outer die 11 that forms an annular gap (passage 10p) for supplying a material (resin material 300) that covers the core material 200c, and a shaft A mold position adjusting unit 30 that adjusts the relative position of the outer mold 11 with respect to the inner mold 12 in the vertical direction, a surface position Lc of the core material 200c supplied to the mold (extrusion head 10), and a coating film 200r are formed. The surface position measuring unit 40 that measures the surface position Lr of the coated wire 200 discharged from the mold (extrusion head 10) and the surface position data of the core material 200c and the coated wire 200 are biased to the coating film 200r. There is meat Ut ( Operation to control the operation of the wire coating apparatus 100 to perform adjustment by the mold position adjustment unit 30 when it is evaluated that there is an uneven thickness Ut. Since the control unit (uneven thickness adjusting device 60) is provided, the uneven thickness Ut of the coating film 200r can be detected and accurately adjusted during coating (molding), so that the uneven thickness Ut is suppressed. The wire 200 can be obtained.

  The uneven thickness evaluation unit 51 calculates the thickness of a plurality of locations in the circumferential direction of the coating film 200r, and evaluates whether the coating film 200r has the uneven thickness Ut based on the calculated thicknesses of the multiple locations. Therefore, even if the center position of the wire is shifted, the uneven thickness Ut can be accurately evaluated.

  Since the operation control unit (uneven thickness adjusting device 60) is configured to control the adjustment amount by the mold position adjusting unit 30 based on the evaluation result of whether or not the unbalanced wall Ut exists, there is no time loss and productivity is improved. A high quality coated wire rod 200 can be manufactured while keeping it.

Embodiment 2. FIG.
In the method for manufacturing a coated wire and the wire coating apparatus according to the second embodiment, the mold position adjustment direction with respect to the inner mold of the outer mold is orthogonal to the first embodiment, not only in one direction perpendicular to the axial direction. It is configured so that it can be performed in two directions. FIGS. 5 and 6 are diagrams for explaining a method of manufacturing a coated wire and a wire coating apparatus according to a second embodiment of the present invention, and FIG. 5 illustrates an extrusion head for explaining the configuration of a mold position adjusting unit. 6A and 6B are schematic diagrams showing a state when viewed from the upstream side, for explaining the configuration of the upstream and downstream surface position measuring units and the surface position data of the wire to be measured, respectively. FIG. In addition, the same code | symbol is attached | subjected to the part similar to what was demonstrated in Embodiment 1, and FIG.1, 2,4 is used.

  As shown in FIG. 5, in the second embodiment, as the mold position adjusting unit 30, a mold position adjusting unit 30V that adjusts the mold position in the vertical direction AxV among the directions perpendicular to the axis, and a horizontal direction AxH. A mold position adjusting unit 30H for adjusting the mold position is provided.

  Then, as shown in FIGS. 6A and 6B, the surface position measurement units 40 </ b> F and 40 </ b> B constituting the surface position measurement unit 40 obtain surface position data corresponding to the adjustment direction of the mold position adjustment unit 30. Therefore, the configuration is as follows. The surface position measuring units 40F and 40B are configured by combining a laser displacement meter 41V that measures the surface position in the vertical direction AxV, a laser displacement meter 41HV that measures the surface position in the horizontal direction AxH, and the reference block 42, respectively. As in the first embodiment, each laser displacement meter 41 is provided with a light projecting portion 41e and a light receiving portion 41s so as to sandwich the measurement target. For example, in the case of the laser displacement meter 41V, 41Ve and 41Vs are attached. It is written. In FIG. 6, unlike FIG. 3 used in the first embodiment, the direction on the paper is aligned with the actual direction, and the laser displacement meter 41V corresponds to the laser displacement meter 41 in the first embodiment.

  By comprising in this way, in the surface position detection process, the surface position of a wire is measured as follows. In the upstream surface position measurement unit 40F, the laser displacement meter 41V irradiates the beam in the horizontal direction, and the distance LVpc from the reference block 42 to the nearest surface position in the vertical direction AxV of the outer diameter of the core material 200c before coating. And the distance LVdc to the farthest surface position is detected. The laser displacement meter 41H irradiates the beam in the vertical direction, and similarly, the distance LHpc from the reference block 42 to the nearest surface position in the horizontal direction AxH of the outer diameter of the core material 200c before coating and the farthest surface position. The distance LHdc is detected. In the downstream surface position measurement unit 40B, the laser displacement meter 41V similarly detects the distance to the surface position in the vertical direction AxV of the coated wire (covered wire 200) as LVpr and LVdr, and the laser displacement meter 41H similarly detects the distance in the horizontal direction AxH as LHpr and LHdr.

In the coating thickness calculation step, the coating thicknesses t1V, t2V, t1H, and t2H are calculated based on the surface position data obtained in the surface position detection step, as shown in equations (5) and (6).
t1V = LVpc−LVpr, t2V = LVdr−LVdc (5)
t1H = LHpc−LHpr, t2H = LHdr−LHdc (6)

In the uneven thickness evaluation process, for each of the vertical direction AxV and the horizontal direction AxH, as shown in equations (7) and (8), the uneven thickness amounts UtV and UtH are compared with the threshold Th,
UtV = | t1V−t2V |> Th (7)
UtH = | t1H−t2H |> Th (8)

For each direction, if the uneven thicknesses UtV and UtH are larger than the threshold value Th, it is determined that there is uneven thickness, and the mold position adjustment amounts VmV and VmH are set as shown in the equations (8) and (9). calculate.
VmV = k (t1V-t2V) (8)
VmH = k (t1H-t2H) (9)

  In the uneven thickness adjustment process, the uneven thickness evaluation unit 51 transmits information indicating whether adjustment is necessary for each direction and the adjustment amount Vm to the displacement amount control unit 52. In the displacement amount control unit 52, the relative position of the outer die 11 with respect to the inner die 12 is feedback controlled by instructing the motor 32 the direction of tightening or loosening the adjusting bolt 31 and the amount thereof according to the adjustment amount Vm. This eliminates uneven thickness. Also in this case, as described in the first embodiment, a time difference is taken for the data from the surface position measurement unit 40F and the surface position measurement unit 40B.

  When adjusting the mold position, for example, the motors 32V and 32H attached to the adjustment bolt 31 are operated, and the adjustment bolts 31V and 31H are both loosened by a predetermined amount, so that the outer mold holder 13 can be moved in each direction. To do. For example, first, with respect to the vertical direction AxV, one of the adjustment bolts 31V is tightened and the other is loosened to displace the relative position of the outer mold 11 with respect to the inner mold 12 in the vertical direction AxV. Next, the relative position is similarly displaced in the horizontal direction AxH. Thereafter, the outer holder 13 is fixed at a predetermined position by simultaneously tightening the motors 32V and 32H. In this way, the outer mold 11 and the inner mold 12 can be arranged concentrically in two directions perpendicular to the axis.

  As described above, according to the method for manufacturing the coated wire 200 according to the second embodiment, in the uneven thickness evaluation step, the uneven thickness of the coating film 200r with respect to a plurality of directions intersecting in the direction perpendicular to the axis. In the mold position adjustment step, the relative position of the outer mold 11 with respect to the inner mold 12 is displaced according to the thickness deviation in each direction, so that the high-quality coated wire rod 200 that further suppresses the thickness deviation. Can be manufactured.

  As described above, according to the wire covering apparatus 100 according to the second embodiment, the surface position measuring unit 40 measures the surface position of the wire in a plurality of directions intersecting in the direction perpendicular to the axis. The deviation evaluation unit 51 evaluates whether or not there is deviation of the coating film 200r with respect to a plurality of intersecting directions in the direction perpendicular to the axis, and the mold position adjustment unit 30 performs deviation for each direction. Since the relative position of the outer mold 11 with respect to the inner mold 12 is displaced according to the meat, the high-quality coated wire rod 200 with suppressed uneven thickness can be manufactured.

Embodiment 3 FIG.
In the first and second embodiments, an example in which a laser displacement meter that measures a one-dimensional distance is used for the surface position measurement unit is shown. However, in the third embodiment, a two-dimensional laser displacement meter is used. The resolution in the circumferential direction was improved. FIGS. 7-10 is a figure for demonstrating the manufacturing method and wire | line material coating | coated apparatus concerning the covering wire material concerning Embodiment 3 of this invention, and Fig.7 (a) and (b) are respectively upstream and downstream. FIGS. 8A and 8B are diagrams for explaining the configuration of the surface position measuring unit, and FIGS. 8A and 8B are diagrams for explaining the surface position data obtained by the upstream and downstream surface position measuring units, respectively. .

  9 (a) and 9 (b) are diagrams and diagrams for explaining the first and third methods for specifying the center position of the wire in the step of calculating the coating thickness from the obtained surface position data. 10 is a diagram for explaining a method of evaluating uneven thickness from the obtained surface position data. In the third embodiment, the same parts as those described in the respective embodiments are denoted by the same reference numerals and the description thereof is omitted, and FIGS. 1, 2, 4, and 5 used in the respective embodiments are omitted. Is incorporated.

  As shown in FIG. 7, in the method for manufacturing the coated wire 200 and the wire coating apparatus 100 according to the third embodiment, the surface position measuring units 40Fv and 40Bv constituting the surface position measuring unit 40v are provided with a two-dimensional laser displacement meter. 41v was used. Further, as in the second embodiment, each two-dimensional displacement meter 41v includes a two-dimensional laser displacement meter 41Vv that scans in the vertical direction from a position separated in the horizontal direction with respect to the wire surface, and a position that is separated in the vertical direction. A two-dimensional laser displacement meter 41Hv that scans in the horizontal direction is used.

With this configuration, in the surface position detection step, the surface position measurement unit 40Fv uses the surface position measurement of the half-circular profile “y = f _c (x)” of the core member 200c as shown in FIG. The section 40Bv detects a half-circular profile “y = f _r (x)” of the coated wire 200 as shown in FIG.

In the coating thickness calculation step, the center position Cc (x _c , y _c ) of the core material 200 _c and the center position Cr (x _r , y _r ) of the coated wire material 200 are calculated by performing image processing on each profile. To do. Although several calculation methods can be considered, three specific examples are shown using FIG. 9 and FIG.

<First method>
As shown in FIG. 8, the profiles “y = f _c (x)” and “y = f _r (x)” are approximately semicircular. Therefore, as shown in FIG. 9A, an arbitrary point Pi in the semicircle is selected, and the distance from the selected point Pi to the profile is searched for radially. A position Pc where the sum of squares of the searched distance is minimized is searched to obtain a center position Cc (x _c , y _c ) and a center position Cr (x _r , y _r ).

<Second method>
As shown in FIG. 8, the profiles “y = f _c (x)” and “y = f _r (x)” are approximately semicircular. Therefore, fitting is performed for each profile as a circle using the least square method. Thereby, the center position Cc (x _c , y _c ) and the center position Cr (x _r , y _r ) are obtained.

<Second method>
As shown in FIG. 8, the profiles “y = f _c (x)” and “y = f _r (x)” are approximately semicircular. Therefore, as shown in FIG. 9B, an arbitrary set of points Ps1 on the profiles “y = f _c (x)” and “y = f _r (x)” are selected, and the perpendicularity of the straight line connecting them is selected. A bisector L1 is obtained. Further, another set of points Ps2 is selected, and the vertical bisector L2 is similarly obtained. With these intersections Pc as the center position of the circle, a center position Cc (x _c , y _c ) and a center position Cr (x _r , y _r ) are obtained.

In this case, considering that the core material 200c and the covered wire material 200 are not in a perfect circle shape, the center position Cc is calculated by calculating the center candidate positions of the circles by increasing the number of combinations of points to be selected and obtaining their centroids. (X _c , y _c ) and the center position Cr (x _r , y _r ) may be obtained.

The center positions Cc and Cr are calculated based on the profile obtained by the two-dimensional laser displacement meter 41Hv in the two-dimensional laser displacement meter 41v. Therefore, although the coordinates x _c and x _r in the horizontal direction AxH can be accurately grasped, the coordinates y _c and y _{r in} the vertical direction AxV are coordinates calculated based on the profile obtained by the two-dimensional laser displacement meter 41Vv. Use.

In the uneven thickness evaluation step, the center position Cc (x _c , y _c ) and the center position Cr (x _r , y _r ) obtained as described above are used, and the vertical direction AxV and the horizontal direction AxH As shown in (10) and (11), the thickness deviations UtV and UtH are compared with the threshold Th2.
UtV = | y _c −y _r |> Th2 (10)
_{UtH = | x c -x r |} > Th2 ··· (11)

For each direction, if the uneven thicknesses UtV and UtH are larger than the threshold value Th2, it is determined that there is uneven thickness, and the mold position adjustment amounts VmV and VmH are set as shown in equations (12) and (13). calculate. In this embodiment, k ₂ is set to 1.
VmV = k ₂ (y _c −y _r ) (12)
VmH = k ₂ (x _c −x _r ) (13)

  In addition, when the roundness of the core material 200c and the covered wire 200 is not sufficient, the accuracy is improved in the order of the second method, the third method, and the first method. Decreases. Therefore, it is preferable to select a detection method according to the roundness of the wire. In these cases, if the reduction in accuracy can be allowed, measurement in only one direction, that is, calculation with only one measurement data of the two-dimensional laser displacement meter 41v may be performed.

  On the other hand, by performing measurement in two directions, the calculation amount can be reduced if the adjustment amount is determined without calculating the center position of the wire as described below. According to this, a measurement period can be implemented more frequently.

As shown in FIG. 10, “y = f _c (x)” and “y = f _r (x)” with respect to the vertical direction AxV obtained by the two-dimensional laser displacement meter 41Vv are superimposed, and f _c (x) The difference in the y direction of f _r (x) is calculated by defining y = g (x) = fc (x) −fr (x). When the maximum value of g (x) and search point _{P MAX,} the center position of the _f c (x) and _f r (x) is If they coincide on the x-axis, g (x) is the search point _{P MAX} It is line symmetric as the center. On the other hand, when the position of the search point P _MAX is not the center, as shown in the lower part of FIG. 10, the difference Δc from the center positions P _{mid of} both ends of g (x) is obtained as the adjustment amount VmV. The same calculation process is performed on the profile in the horizontal direction AxH obtained by the two-dimensional laser displacement meter 41Hv, thereby obtaining the adjustment amount VmH. By doing as described above, even when the roundness of the circle is not sufficient, the uneven thickness can be determined and adjusted more accurately.

10: Extrusion head (molding die), 10p: passage, 11: outer mold, 12: inner mold, 15: outer cylinder, 16: inner cylinder, 13: outer mold holder, 14: inner mold holder, 20: extruder, 21: Cylinder, 22: Screw, 30: Die position adjusting unit, 31 Adjustment bolt, 32: Motor, 40: Surface position measuring unit, 40A, 40B: Surface position measuring unit, 41: Laser displacement meter, 42: Reference block, 51: Uneven thickness evaluation unit, 52: Displacement amount control unit, 60: Unbalance thickness adjusting device (operation control unit), 100: Wire material coating device, 200: Coated wire material, 200c: Core material, 200r: Coating film, 300: Resin material,
Pc: center point, Pi: exploration point.

Claims (8)

A cylindrical inner mold that guides the core material so as to travel along the axis; and an outer mold that is arranged concentrically with the inner mold and forms an annular gap for supplying a material covering the core material. A method for producing a coated wire using a mold having
Measuring the surface position of the core material supplied to the mold, and the surface position of the coated wire discharged from the mold;
From the data of the surface position of the core material and the coated wire, the thickness of the coating film is calculated, and whether or not the coating film has a thickness deviation,
A mold position adjusting step of adjusting a relative position of the outer mold with respect to the inner mold in a direction perpendicular to the axis when it is evaluated that there is the uneven thickness;
A method for producing a coated wire, comprising:   In the uneven thickness evaluation step, the thickness of a plurality of locations in the circumferential direction of the coating film is calculated, and whether or not the coating film is uneven based on the calculated thicknesses of the multiple locations is evaluated. The method for producing a coated wire according to claim 1. The molding die is provided with a die position adjusting unit that adjusts a relative position of the outer die with respect to the inner die in a direction perpendicular to the axis.
3. The method of manufacturing a coated wire according to claim 1, wherein in the mold position adjusting step, the operation of the mold position adjusting unit is automatically controlled based on an evaluation result of whether or not there is an uneven thickness. . A cylindrical inner mold that guides the core material so as to travel along the axis; and an outer mold that is arranged concentrically with the inner mold and forms an annular gap for supplying a material covering the core material. A mold provided with
A mold position adjusting unit that adjusts a relative position of the outer mold with respect to the inner mold in a direction perpendicular to the axis;
A surface position measurement unit that measures the surface position of the core material supplied to the mold, and the surface position of the coated wire that is formed from the coating film and discharged from the mold;
From the data of the surface position of the core material and the coated wire, the uneven thickness evaluation unit for evaluating whether there is uneven thickness in the coating film,
When it is evaluated that there is uneven thickness, in order to perform adjustment by the mold position adjustment unit, an operation control unit that controls the operation of the device,
A wire covering apparatus comprising:   The uneven thickness evaluation unit calculates the thickness of a plurality of locations in the circumferential direction of the coating film, and evaluates whether or not the coating film has an uneven thickness based on the calculated thickness of the multiple locations. The wire coating apparatus according to claim 4.   The wire covering apparatus according to claim 4 or 5, wherein the operation control unit controls an adjustment amount by the mold position adjusting unit based on an evaluation result of whether or not there is an uneven thickness.   The wire surface coating apparatus according to claim 4, wherein the surface position measurement unit is configured using a non-contact displacement meter.   The wire surface coating apparatus according to claim 4, wherein the surface position measurement unit is configured using a contact-type displacement meter.

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