JP2001321828A - Method of manufacturing for metallic wire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a high-quality wire at high efficiency and also to make of measurement and adjustment of a roll gap simple and easy by improving the accuracy of the measurement and adjustment. SOLUTION: By inserting a dummy material B1 instead of a material A1 to be rolled into the roll caliber 161c formed between rolls 101a and 101b and measuring and adjusting the roll gap L1 in the state where the dummy material is compressively deformed between the rolls, simulation state which is approximately similar to the state actually feeding the material A1 to be rolled between a pair of rolls and performing rolling is realized. In this simulation state, clearance such as play which a roll driving mechanism has is filled up by the press- contacting force of the roll caliber 161c and play is suppressed. Then, by the compressive deformation of the dummy material B1, the roll gap L1 can be measured and adjusted in the state which is approximately made to coincide with the ordinary state of wire rolling, so the accuracy of the measurement and adjustment is improved, the generation of torsion during rolling is prevented and the metallic wire having high finished accuracy and high quality after rolling is manufactured at high efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as a method for producing a metal wire, a drawing method, a rolling method, and a method combining both are known. Of these, the wire drawing method is a method of obtaining a wire by sequentially passing a material to be rolled through a plurality of drawing dies whose hole diameters are gradually reduced, and is usually used for producing a fine wire. On the other hand, in the rolling method, the rotation axis is, for example, approximately 90 °.
Is provided in multiple stages, and the rolled material is sequentially rolled by the pair of rolls to reduce the diameter. This rolling method has an advantage of higher productivity than the drawing method.

[0003] In the above-mentioned rolling method, rolling is also performed by forming a groove defining the cross-sectional shape of the material to be rolled on the rolling surface of the roll. When the rolling surfaces are combined with each other, the cross-sectional shape of the groove portion (hereinafter, also referred to as a roll hole shape or simply a hole shape) is made to be an elliptical shape, and the hole shape of the pair of rolls on the downstream side is set. If the wire is formed in a circular shape, the wire reduction rate (cross-section reduction rate) of the wire per pass can be increased, and the productivity can be further improved.

[0004]

However, in the above-mentioned rolling method, when the material to be rolled is transferred from the paired roll on the upstream side to the paired roll on the downstream side, the wire may be twisted. Such twisting of the wire is likely to occur when the shape of the hole shape of the pair of rolls is different between the upstream side and the downstream side, for example, when the shape is set to an elliptical-circular shape as described above. If the rolling is continued while the torsion is generated, troubles such as a disorder in the cross-sectional shape of the wire and a break in the wire may be caused.

[0005] In this case, it is known that, for example, when the material to be rolled is Ti or an alloy thereof, torsion easily occurs during rolling. This is because although Ti or its alloy is hard, it is thinned by hot rolling, but its rigidity (transverse elastic modulus) is smaller than that of steel and the like, and tends to further decrease as the temperature rises. This is presumed to be because twisting tends to occur during hot rolling. For this reason, for example, when the wire diameter of Ti or its alloy is 3 mm or less, twisting is particularly likely to occur during rolling. , The roll interval) must be precisely adjusted.

Accordingly, Japanese Patent Application Laid-Open No. 8-178629 discloses that
A method for measuring the distance between the edges of a pair of rolls with a laser sensor is disclosed. Since the laser sensor is attached to the supporting portion that comes into contact with the edge of the roll, it is possible to accurately measure the roll interval in a unit of μm without the rolled material being bitten. However, when the material to be rolled is actually supplied between the rolls, a gap (eg, a gap between the roll rotation shaft and its bearing) that the drive mechanism of the roll inevitably has is generated by the driving force of the roll. And the gap between the rolls before the bite of the material to be rolled is displaced by the processing force of the rolling process, etc., so sufficient accuracy is required for measurement and adjustment of the roll interval in the non-biting state of the material to be rolled. I can't get it.

SUMMARY OF THE INVENTION An object of the present invention is to improve the accuracy of measurement and adjustment of the roll gap, to produce a high-quality wire rod with high efficiency, and to manufacture a metal wire rod capable of measuring and adjusting the roll gap easily and easily. It is to provide a method.

[0008]

Means for Solving the Problems and Functions / Effects In order to solve the above-mentioned problems, a method for manufacturing a metal wire according to the present invention has the following features. That is, a substitute formed in place of a material to be rolled is sandwiched between rolled dies formed between pairs of rolls, and the substitute is compressed and deformed between the rolls. Hereinafter, it is called a roll interval.)
Is measured, the roll interval is adjusted within a predetermined range based on the measurement result, and then the material to be rolled is subjected to wire rolling in the roll groove between the rolls.

As described above, the substitute material for the material to be rolled is sandwiched between the roll holes formed between the paired rolls, and the roll distance is measured and measured while the substitute material is compressed and deformed between the rolls. By performing the adjustment, it is possible to realize a simulation state substantially similar to that in which the material to be rolled is actually supplied between the rolls and the wire rod is rolled. In other words, in such a simulation state, the above-described gaps of the roll driving mechanism, such as the play, are filled by the roll-hole-type press-fitting force, and rattling is suppressed. Therefore, due to the compressive deformation of the substitute material, the roll interval can be measured and adjusted in a state almost coincident with the normal wire rolling state, so that the accuracy of the roll interval measurement and adjustment is improved, and the occurrence of torsion during rolling is reduced. Thus, a high-quality metal wire with high finishing accuracy after rolling can be manufactured with high efficiency. In addition, in the measurement and adjustment of the roll interval, there is no need to rotate (rotate) the pair of rolls to move (flow) the substitute material as in a normal wire rolling process. Therefore, for example, the power transmission to the roll drive source is cut off, the roll stand is separated and moved to a predetermined position, and the roll interval can be measured and adjusted. Therefore, the roll interval can be measured and adjusted easily and easily. .

As an alternative material that is compressed and deformed between rolls,
In the case of a material having a tensile strength of 100 MPa or less,
The substitute will be constructed of a soft material that has a lower tensile strength than many metals. Therefore, at the time of measurement and adjustment of the roll interval, this substitute material absorbs the gap of the above-described play and the like that the roll drive mechanism has, and the substitute material itself plastically deforms following the change in the roll interval, The accuracy of measurement and adjustment of the roll interval does not decrease. In addition, if the tensile strength of the substitute material is 100 MPa or less (more desirably, 50 MPa or less), after the measurement and adjustment of the roll interval is completed, the substitute material sandwiched between the roll holes between the rolls is replaced with a human-powered one. It can be cut or removed by pulling or twisting with a hand tool or a hand-held tool, so that there is no hindrance to the wire rolling of the material to be rolled.

As an example of such an alternative material, Sn, C
A metal material (for example, a material for solder or a fuse) containing any one of u, Pb, and Bi as a main component can be given. In addition, foamable plastic (for example,
Resins such as polyurethane and polystyrene) may be used. In the present specification, the “main component” means a component having the highest weight content in the substance of interest, and does not necessarily mean a component occupying 50% by weight or more.

The roll interval can be measured by a non-contact type sensor such as an ultrasonic sensor, a photoelectric sensor, and a magnescale. It can be adjusted step by step in units. In the case of measuring the roll interval with a laser sensor, particularly a transmission type laser sensor, precise measurement / adjustment in units of, for example, 5 μm is possible, and the accuracy of roll interval measurement / adjustment is dramatically improved.

Here, when the material to be rolled is Ti or a Ti alloy, the rigidity of the material is originally smaller than that of steel or the like, and tends to further decrease as the temperature rises. In the case of Ti or Ti alloy, the rolling temperature (normally 9
Stiffness of 50 GPa)
Or less, or the wire diameter after rolling is 3 mm
In the following cases, in particular, the torsion during rolling is likely to occur, and due to the torsion, the cross-sectional shape of the wire is disturbed,
Rolling may be hindered by the wire being cut off. Measure the roll distance with the substitute material compressed and deformed.
The present invention to be adjusted is useful in preventing such a situation from occurring.

The rigidity (transverse elastic modulus) G of the material to be rolled
Is obtained by performing a torsion test in which one end of a round bar having a diameter d and a length L is fixed and a torsion is applied to the other end, and the torsional moment T and the torsion angle θ are measured. G = 32TL / (πθd ⁴ ) (1) The rigidity at a high temperature can be calculated using an ultrasonic elastic modulus measuring device, and a typical Ti alloy, Ti-
In 6Al-4V, the rigidity at room temperature (0 to 50 ° C.) is 45 to 50 GPa, and the hot rolling temperature is 800 to 1000 GPa.
° C) was 20 to 25 GPa.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 conceptually shows the entire configuration of a rolling apparatus 1 as one embodiment of the present invention. That is, the rolling device 1 is provided with two sets of rolling rolls to be described below in the conveying direction of the material A1 (S1 and S1).
2) The rolled material A1 is sequentially rolled. That is, as shown in FIG. 2, in the stand S1 on the front stage side, on the introduction side of the material to be rolled A1, the second axis is arranged so that the rotation axis is substantially perpendicular to the installation surface (not shown). One pair of rolls 101a and 101b
(Hereinafter, when both are shown together, the first pair roll 10
1) (first horizontal stand)
And, at a later stage, a second pair of rolls 102a and 102b arranged such that the axis of rotation is substantially horizontal.
(Hereinafter, when both are shown together, the second pair of rolls 10
2) (vertical stand)
Are disposed respectively, and the paired rolls 101 and 10
The angle formed by each of the rotation axes 2 is set to approximately 90 °.

As shown in FIG. 3, the first pair of rolls 101
a, 101b and a second pair of rolls 102a, 102b
Are formed with rolling surfaces 151a, 151b and 152a, 152b, respectively, on their outer peripheral surfaces, and groove portions 161a, 1b defining the cross-sectional shape and dimensions of the material A1 to be rolled.
61b and 162a, 162b are formed. The widths W1 and W2 of the grooves 161a, 161b and 162a, 162b are 7 mm or less for the former and 6 mm or less for the latter. Here, as shown in FIG. 3 (a), the first pair of rolls 101 is configured such that the rolling surfaces 151a, 151b
Are combined, a roll hole die 161c having an elliptical cross section is formed. FIG.
In (a), when the rolling surfaces 152a and 152b are combined with each other, the second pair of rolls 102 has an elliptical cross-sectional shape whose axial ratio is closer to 1 than the roll hole die 161c, that is, a circular shape. A roll hole die 162c having a cross-sectional shape close to the shape is formed.

On the other hand, as shown in FIG.
The first stand 213 and the second stand 214 provided with the first and second paired rolls 201 and 202, respectively, are disposed in a similar configuration after the counter stand S1 and have a smaller hole shape than the counter stand S1. Have. In addition, three or more stands can be installed.

Returning to FIG. 1, each pair of rolls 101, 102,
201 and 202 are connected to a roll driving motor (hereinafter simply referred to as a motor) 252 as a common driving source via a distributor 250 and reduction gears 253 to 256 provided for each pair of rolls. . That is, the motor 252
Is rotated by a reduction mechanism 253 to 25 constituted by a gear mechanism.
While being decelerated at a predetermined gear ratio by 6, it is transmitted to each pair of rolls 101, 102, 201, 202 by the distributor 250.

The details of the structure of each pair of stands S1 and S2 will be described below. (Because the two pairs of stands have exactly the same structure except for the size or shape of the roll hole type of the pair of rolls as described above, Only the stand S1 will be described). First, as shown in FIG.
The distance P between the center of the second stand 14 and the second stand 14 is set to 50 mm or less. Also, the pair of rolls 101a and 10a
1 <b between the roll outer diameter d and the center distance P.
The outer diameter d is set so that the relationship of 1.2d is satisfied. Furthermore, when the wire diameter of the material to be rolled out from the second stand 14 is D, the value of P / D is set to 25 or less.

Hereinafter, a method of rolling a Ti or Ti alloy wire rod using the rolling device 1 will be described. (1) Measurement and Adjustment of Roll Interval Due to Compressive Deformation of Dummy Material To set each roll interval L1, L2 of each pair of rolls 101, 102, 201, 202 to a specified value, first, the drive source of each roll Motor 252 and distributor 2
Then, the first stand 12,213 and the second stand 14,214 are separated. Then, as shown in FIG. 5, the first stand 12 is moved to the roll interval measuring device RM fixed at a position different from the rolling device 1. The roll distance measuring device RM includes a first measuring unit R including a light emitting unit LS1 of a transmission laser sensor (hereinafter, also simply referred to as a sensor) LS.
M1 and a second measuring unit RM2 provided with a light receiving unit LS2, and the light projecting unit LS1 and the light receiving unit LS2 are provided to face each other with their axes coincident with each other. The first stand 12 is positioned between the first measuring unit RM1 and the second measuring unit RM2 such that the axis connecting the pair of rolls 101a and 101b is substantially orthogonal to the axis of the sensor LS in plan view (FIG. 5). Installed in

A dummy material B1 of a Pb or Pb alloy thread-making fuse (for example, a tensile strength of 22.8 MPa) is placed in the roll hole die 161c of the pair of rolls 101a and 101b.
With the (substitute material) being sandwiched and being compressed and deformed between the rolls 101a and 101b, the roll interval L1 is measured by the sensor LS. Specifically, the laser beam emitted from the light projecting unit LS1 is scanned in the direction of forming the roll interval, and the roll edges RE1, RE1 of the rolls 101a and 101b are scanned.
The position of the leading edge of RE1 is measured, and the roll edges RE1,
The distance between RE1 is calculated as the roll interval L1. The calculated roll interval L1 is input to the control unit 30 including a microprocessor including a CPU, a ROM, a RAM, and the like. The control unit 30 controls the first pair of roll approach / separation actuators (for example,
A signal for rotating the motor 40 forward and backward is issued, and the distance L1 between the first pair of rolls 101a and 101b is adjusted to the set distance L11 (see FIG. 5B). The laser sensor L
S may be a system in which a band-shaped beam is emitted from the light projecting unit LS1 and detected by the line type light receiving unit LS2.

After the measurement and adjustment of the roll interval L1, the dummy material B1 sandwiched between the roll die 161c of the pair of rolls 101a and 101b is cut and removed. At this time, since the dummy material B1 is soft and hardly elastically restored, the dummy material B1 can be easily cut or removed by pulling or twisting it manually or with a hand-held tool. The first stand 12 having finished measuring and adjusting the roll interval L1 is returned to the rolling device 1.

As described above, the pair of rolls 101a and 101b
In a state where the dummy material B1 is sandwiched between the roll hole dies 161c and compressed and deformed between the rolls 101a and 101b,
The roll interval L1 is measured and adjusted by the sensor LS. At this time, in the roll driving mechanism, for example, a gap (for example, 0.1 to 0.2 mm) formed between the roll rotation shaft 28 and the bearing 30 such as a play is formed by the roll hole die 161.
Filling is performed by the pressing force of c, and rattling is suppressed. Therefore, due to the compressive deformation of the dummy material B1, the roll distance L1 can be measured and adjusted in a state almost in agreement with the normal wire rolling state.

Note that the original roll interval is the roll hole type 16
1c, that is, the opposed groove portions 161a, 161
1b, the groove 161a, 1
Since 61b is a three-dimensional curved surface, it is difficult to specify both end positions of the maximum interval L1 ', and a measurement error is likely to occur. Therefore,
Both ends appear in a straight line, making it easy to measure against roll 101
The distance L1 between the roll edge portions RE1 and RE1 of a and 101b is measured as the roll interval. This, together with the use of the transmission type laser sensor LS, enables precise measurement and adjustment of the roll interval L1 in units of 5 μm, for example.

As an example of the measurement and adjustment of the roll interval L1, the roll interval L1 is adjusted to a set roll interval L11 = 0.3 mm by a roll interval measuring device RM, and then the roll interval L1 is changed again by an optical interferometer (for example, Michelson As a result of precise measurement using an interferometer) or the like, L1 was 0.303 mm. Roll gap adjustment error (measurement accuracy): L1-L11 =
0.003 mm = 3 μm, and an accuracy of 5 μm or less was achieved.

Next, as shown in FIG. 6, the second stand 14 is moved between the first measuring section RM1 and the second measuring section RM2 of the roll distance measuring device RM, and the roll distance measuring device R
M, control unit 30, second pair roll approach / separation actuator (for example, motor) 41, etc., measure and adjust roll interval L2. The configuration of FIG. 6 is different from that of FIG.
The other configuration is almost the same except that the rotation axes of the paired rolls arranged adjacent to each other are alternately different from each other by 90 °, and the detailed description is omitted. Furthermore, the first stand 213
The second stand 214 also measures and adjusts the roll intervals L1 and L2 in the same manner as in FIGS. As described above, the roll interval measuring device RM is fixedly provided at a position different from the rolling device 1, and the
2, 14, 213, 214 are individually moved to measure and adjust the roll intervals L1, L2, so that the roll intervals L1, L2
It is easy to keep the dimensional accuracy constant without causing variation.

(2) Heating In the case where Ti or a Ti alloy is used as the material to be rolled A1, it is necessary to heat the material to be rolled A1 before rolling to perform hot rolling while reducing the deformation resistance, thereby reducing the rolling efficiency. As a result, it is advantageous in improving the production efficiency of the wire. Therefore, immediately before the material to be rolled A1 is introduced into the first stand 12, it is heated. As a method of heating the material A1 to be rolled, an electric heating method by directly energizing the material A1 to be rolled can be suitably used. For example, as shown in FIG. 4, the electrodes 71a and 71b that come into contact with the material A1 while allowing the material A1 to be transported are allowed.
And a power supply 72 is provided through these electrodes 71a and 71b.
By applying a current to the material to be rolled A1, the material is heated to 800 to 1000 ° C. (for example, 900 ° C.). The heating method is not limited to the above-described method as long as the material to be rolled A1 can be heated substantially uniformly before rolling. For example, an induction heating furnace or the like may be provided in a portion immediately before the first stand 12. May be installed, and the material to be rolled A1 may be introduced into the first stand 12 after passing through the furnace.

(3) Rolling with Stand S1 Next, the roll driving motor 252 is rotated to start rolling. That is, with respect to the stand S1 shown in FIG.
When the material to be rolled A1 having a circular cross section and the initial setting D0 is introduced from the first stand 12 side, the material to be rolled A1 has an elliptical cross section in its hole shape 161c as shown in FIG. Rolled as follows. Next, as shown in FIG. 4B, the second die 14 is rolled so as to have a circular cross section in the hole die 162c of the second stand 14, and as shown in FIG.
(<D0) is derived as the wire A2. That is, as shown in FIG. 3 (c), the cross-sectional shape of the material to be rolled is changed from circular to elliptical to circular while the cross-sectional area is reduced. Here, in the first stand 12, the material to be rolled A
1 is that the cross-sectional dimension D1 in the compression direction (that is, equivalent to the minor axis of the ellipse) is the cross-sectional dimension D2 in the direction orthogonal to this
(I.e., corresponding to the major axis of the ellipse). Next, at the second stand 14,
Since the compression direction with respect to the material to be rolled A1 changes by almost 90 °, the material is rolled so that the ratio D2 / D1 of the cross-sectional dimensions is reduced. That is, in FIG. 3B, if the above dimensions after rolling are D1 ′ and D2 ′, (D2 / D1)> (D2 ′)
/ D1 ') (where D2' = D1 '= D).

Here, as described above, the first stand 12 and the second stand 14 are formed by the first and second pair rolls 101.
a, 101b and the distance P between the centers of 102a, 102b and the wire diameter D of the material A1 to be rolled out from the second stand 14.
Is set to 25 or less. As a result, it is possible to accurately supply the rolled material A1 to the die 162c (FIG. 3) of the second stand 14 without twisting the rolled material A1 without providing a guide means such as a roller guide as in the related art. . Further, the center distance P is set to 50 mm or less, and the outer diameter d is set so that the relation of P <1.2d is established between the outer diameter d of the pair of rolls 101a and 101b and the center distance P. d is set. By setting in this manner, the material to be rolled A
1 to prevent the occurrence of twisting,
The material to be rolled A1 can be accurately supplied to 62c.
Therefore, in the rolling process of a wire made of Ti or a Ti alloy in which twisting is likely to occur, the dummy materials B1, B2 are formed before the rolling process.
Combined with measuring and adjusting the roll spacing while compressively deforming, it prevents twisting during rolling and produces high quality Ti or Ti alloy wires with high finishing accuracy after rolling with high efficiency. it can.

(4) Rolling on Stand S2 When the rolling on the preceding stand S1 is completed, the material to be rolled A1 is continuously introduced into the stand S2 and rolled in the same manner as on the stand S1. Wire diameter DS after rolling is 3m
m or less.

[Brief description of the drawings]

FIG. 1 is a front view conceptually showing an example of a rolling device of the present invention.

FIG. 2 is a perspective view showing a main part of the stand.

FIG. 3 is a schematic diagram showing an example of a cross-sectional shape of a roll hole type of first and second paired rolls.

FIG. 4 is a plan view schematically showing an arrangement of a pair of stands.

FIGS. 5A and 5B are a plan view schematically showing a state where measurement and adjustment of a roll interval of the first stand are performed, and a cross-sectional view taken along line XX thereof.

FIG. 6 is a front view schematically showing a state where measurement and adjustment of a roll interval of the second stand are performed, and a YY sectional view thereof.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rolling apparatus 12,213 First stand (horizontal stand) 101,201 First pair of rolls (pair of rolls) 14,214 Second stand (vertical stand) 102,202 Second pair of rolls (pair of rolls) A1 Rolled Material B1 Dummy material (alternative material) B2 Dummy material (alternative material) L1 Roll interval between first paired rolls (roll interval) L2 Roll interval between second paired rolls (roll interval) LS Laser sensor

Claims (8)

[Claims] 1. An alternative material which substitutes for a material to be rolled is sandwiched between roll rolls formed between pairs of rolls, and the alternative material is compressed and deformed between the rolls. After measuring the interval (hereinafter referred to as a roll interval), adjusting the roll interval within a predetermined range based on the measurement result, the material to be rolled is subjected to wire rod rolling in the roll groove between the rolls. A method for producing a metal wire. 2. The substitute material has a tensile strength of 100 MPa.
The method for producing a metal wire according to claim 1, comprising the following material. 3. The substitute material is composed of Sn, Cu, Pb and B.
3. The method for producing a metal wire according to claim 1, wherein any one of i is a main component. 4. The metal wire according to claim 1, wherein the adjustment of the roll interval is performed by adjusting the roll interval continuously or stepwise in units of 0.03 mm or less. Production method. 5. The method for manufacturing a metal wire according to claim 1, wherein the roll interval is measured by a laser sensor. 6. The method for manufacturing a metal wire according to claim 1, wherein the material to be rolled is made of a material having a rigidity at a rolling temperature of 50 GPa or less. 7. The material to be rolled has a wire diameter after rolling of 3 mm.
The method for producing a metal wire according to any one of claims 1 to 6, which is not more than mm. 8. The material to be rolled is made of Ti or T
The method for producing a metal wire according to any one of claims 1 to 7, which is an i-alloy.