JP2629713B2 - Marking device for wire drawing flaw detection - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flaw detection marking device that detects a position of a flaw on the surface of a drawn wire and applies an identification mark to the position.

(Prior Art) A processed material, for example, a drawn wire obtained by rolling or drawing a steel material has a surface flaw generated by a rolling roller or the like. If the drawn wire having such surface flaws is directly processed into a product, a defective product due to the surface flaws is generated. For this reason, conventionally, for example, by detecting a surface flaw formed on the drawn wire after the drawing, the surface flaw is immediately deleted following the drawing. However, since the flaw removal speed of this surface flaw is slower than the drawing speed in the drawing process,
As described above, if a flaw removal operation is performed subsequent to the drawing operation, there is an inconvenience that the productivity of the drawn wire is significantly impaired.

Therefore, instead of removing the surface flaws immediately after the drawing process as described above, a mark is once formed with a paint or the like at a portion where the surface flaw is present, and the mark is detected in the subsequent product manufacturing process. Depending on the removal of the part, or scraping the surface flaw, or
It has been proposed to remove the product having the mark after the product is manufactured.

(Problems to be Solved by the Invention) However, when such a drawn material is wound on a roll or the like, or when the drawn materials come into contact with each other during the transportation, the mark is peeled off. There is a problem of being hindered.

The present invention has been made in view of the above conventional problems,
It is an object of the present invention to provide a flaw detection marking device capable of performing a process for preventing a mark for identifying a surface flaw of a drawn material from peeling off.

(Means for Solving the Problems) In order to achieve the above object, according to the present invention, at the time of manufacturing a drawn wire, an identification mark is applied to a surface flaw portion of the drawn wire, and A flaw detection marking device for a drawn wire used in a surface flaw detection system that detects the elongation identification mark during processing to identify a surface flaw portion, and a flaw detection means for detecting a surface flaw of a moving drawn wire. Marking means for applying an identification mark to a portion of a surface flaw of the drawn wire, which is detected by the flaw detection means, provided after the flaw detection means, and provided after the marking means. Marking protection means for covering a whole area of the identification mark and applying a transparent and quick-drying protection paint is provided.

(Action) According to the flaw detection marking device of the present invention, the entire surface of the mark formed by coating on the surface of the drawn material is protected by being covered with a transparent and quick-drying protective paint. When the wire is wound by a roll, or when the drawn wires come into contact with each other during transport, the marks are prevented from peeling off. Further, since the protective paint does not interfere with the mark detection process, the identification mark detection operation can be performed accurately.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As an example, a case will be described in which a surface flaw of a drawn wire is detected using a surface flaw detection system including a wire detection / marking device for a drawn wire of the present invention, and the drawn wire is processed while sorting out good and defective products. .

In FIG. 1, an intermediate wire rod 10 obtained by rolling and drawing a steel material is wound around a roll 12 which is rotatably supported. This intermediate wire 10 is drawn in the drawing dies 16, 18 and 20 in a state where tension is applied by the plurality of rollers 14, so that a further drawing process is performed to obtain a wire 22 having a desired thickness. Manufactured and wound on roll 24.

A flaw detection device 26 by eddy current flaw detection or the like functioning as a flaw detection means is disposed between the drawing dies 18 and 20, and detects surface flaws of the drawn wire 22 caused by rolling or drawing in the previous process. Upon detection, a flaw signal SK is output to the marking control device 28. Also, wire drawing dies 20
A marking device 30 and a marking protection device 31 are disposed between the roller and the roll 24. According to the marking signal SM output from the marking control device 28, the marking device 30 attaches an identification mark to a portion where the surface flaw of the drawn wire 22 exists. On the other hand, the marking protection device 31 similarly operates in accordance with the marking protection signal SH output from the control device 28,
A protective paint is applied on the identification mark applied to the drawn wire 22 as described above. Here, the marking device 30 and the marking control device 28 function as marking means for applying an identification mark to a wire drawn at high speed, and the marking protection device 31 and the marking control device 28 cover the entire area of the identification mark. It functions as marking protection means for applying a protective paint to cover.

The marking control device 28 sets the marking signal SM after a predetermined delay time determined in advance based on the drawing speed, as a time required for the drawn wire 22 passing through the portion where the flaw detection device 26 is arranged to reach the position of the marking device 30. And output
Further, as a time required for the drawn wire 22 passing through the marking device 30 to reach the position of the marking protection device 31, the marking protection signal SH is output after a predetermined delay time predetermined based on the drawing speed as described above. ing.

In the above configuration, it is also possible to arrange a pulse generator or the like on the roller 14 to calculate the delay time while measuring the actual drawing speed during the drawing operation. Pull out 26 dice 20
And between the roll 24 and the like.

As shown in FIG. 2, the marking device 30
Are provided with a pair of spray guns 32, 32 for spraying the paint for marking from two positions separated by approximately 90 ° around the axis of the wire. The outer peripheral surface of the drawn wire 22 having a substantially circular cross section has 60 The identification mark 34 (hereinafter referred to as the mark 34) made of the paint is applied to a range wider than%.

In the spray gun 32, as shown in FIG. 3, pressurized air is supplied into a pressure chamber 38 of a main body 36 via an electromagnetic valve (not shown), and a needle valve 40 is retracted against the urging force of a spring 42. Thereby, the high pressure circulating in the paint chamber 44, for example, 30
~ 35kg / cm ² paint is sprayed from the nozzle 46,
It has extremely high responsiveness. When the marking signal SM is supplied, the solenoid valve is opened and closed at least twice at a predetermined constant time interval, and the marking signal SM is continuously supplied. In the meantime, the opening and closing are repeated. As a result, the marks 34 are intermittently provided at regular intervals on the drawn wire 22 moving at a drawing speed of about 100 m per minute. The periphery of the nozzle 46 is sealed by a seal liquid supplied through a passage 50 in order to prevent clogging due to adhesion of the paint.

The marking protection device 31 is also the marking device 30 described above.
The marking protection signal SH
Is supplied, the protective paint is sprayed on the surface of the drawn wire 22 by opening and closing the solenoid valve. However, since this protective paint needs to be applied so as to cover the entire surface of the mark 34, the spray of paint from the nozzle is performed intermittently while the marking protection signal is supplied, rather than intermittently. Is preferably performed.

FIG. 4 shows an example of the drawn wire 22 in which the series of marks 34 and the protective paint 35 are applied to the flaws 48 in this manner. That is, the flaw 48 has three marks 34 along its longitudinal direction.
Are applied intermittently at predetermined intervals, and a protective paint 35 is continuously applied in a longitudinal direction on the mark 34 so as to cover the entire mark 34.

The paint used to form the mark 34 is, for example, an oil-based quick-drying paint containing coarse particles that diffusely reflect light, such as glass powder, metal powder such as stainless steel, and inorganic powder. Fast-drying paints include, for example, acetone 60%, toluene 10%, special film forming agent 13%, white pigment 6%, other 11%
%, And dry in a relatively short time even at room temperature. However, since the paint is applied to the surface of the drawn wire 22 immediately after the drawing process, the paint dries more quickly due to the heat generated by the drawing process. Furthermore, as paint for mark 34,
In addition to the above, for example, a normal quick-drying paint containing no coarse particles that diffusely reflect light or a fast-drying fluorescent paint can also be used.

On the other hand, the mark protecting paint 35 is not particularly limited as long as it does not prevent the detection of the mark 34 in the subsequent mark detection step. That is, it is possible to use a paint that has quick drying properties, is transparent, does not block the light beam for mark detection, and has good adhesion. Specific examples include lacquer clear (for example, trade name “Atom Spray” (manufactured by Atom Chemical Coatings)).

In this way, after the mark 34 is applied to the surface of the drawn wire 22, the protective paint 35 is formed by coating over the entire surface of the mark 34, and thus, at the time of winding the drawn wire 22, or
The separation of the mark 34 during transportation is prevented, and the reliability of the sorting operation at the subsequent stage is significantly improved.

In FIG. 1, the mark 34 and the protective paint 35 described above are used.
The drawn wire material 22 coated and wound on the roll 24 is then conveyed to a product manufacturing line such as a bolt, and is pulled out of the roll 24 by a plurality of drive rollers 52, while the cutting machine
By 54, the product material 56 having a predetermined length is cut. A mark detecting device 58 for detecting the mark 34 is arranged between the roll 24 and the cutting machine 54, and outputs a mark detecting signal SS to the sorting control device 60.
The mark detection device 58 includes a pair of light emitters 62 and a light receiver 64 as shown in FIG. 5, and receives reflected light of the light projected from the light emitter 62 by the light receiver 64, The presence or absence of the mark 34 is detected based on the change in the intensity of the reflected light between the portion where the mark 34 is applied and the other portion. At this time, the entire surface of the mark 34 is covered with the protective paint 35, but as described above, since the protective paint 35 is transparent and does not block the light from the projector 62, the detection work is performed. Can be performed accurately.

The sorting control device 60 is supplied with a pulse signal SP and a tact signal ST from a pulse generator 66 and a cutting machine 54, respectively. With the rotation of the pressing roller 68 provided opposite the driving roller 52, the pulse generator 66 generates a pulse signal SP of a number corresponding to the rotation speed, that is, the moving amount of the wire rod 22.
Is output. The tact signal ST is output when the cutting machine 54 operates, that is, when the movement of the wire rod 22 is stopped. The selection control device 60 to which the pulse signal SP, the tact signal ST, and the mark detection signal SS are supplied processes the signals, outputs a selection signal SC to the selection device 70, and outputs the selection signal SC. Is driven in accordance with the above, the product material 56 in which the mark 34 is present is removed as a defective product in the container 72, and the product material 56 in which the mark 34 is not present.
Only the non-defective product is transferred to the subsequent product processing process.

As described above, after the wire rod 22 is manufactured from the intermediate wire rod 10 and the mark 34 is applied to a portion where the flaw 48 is present, the product material 56 having the mark 34 is simultaneously cut out from the wire rod 22 and cut out. In a series of processing steps to select
Since the entire surface of the mark 34 is covered with the protective paint 35, the mark 34 is prevented from peeling off when the wire is wound on a roll or when the wire is conveyed. The process can be performed accurately.

In the above-described embodiment, an example in which the mark 34 is intermittently applied to the flaw portion 48 at a predetermined interval has been described, but the invention is not limited thereto, and it is also possible to form a mark continuously on the flaw portion 48. . Further, the mark 34 is not necessarily applied only to the flaw 48, but may be provided at a portion other than the flaw, for example, a drawn wire at a constant interval.

Further, in the above-described embodiment, the non-defective product and the non-defective product are sorted at the stage of the product material 56. However, the product material 56 may be configured to be sorted after the product material is formed.
In the above embodiment, the product member in which the mark 34 exists
Instead of excluding 56, it is also possible to configure so as to delete the portion where the mark 34 is added.

Further, in the above-described embodiment, the description has been given of the one obtained by drawing as the drawn wire. However, the present invention is not limited to this, and can be applied to a rolled material, a bar, or the like. The cross-sectional shape of the wire is not limited to a circle.

(Effect of the Invention) As described above, the flaw detection marking apparatus of the present invention applies an identification mark to a surface flaw portion of a drawn wire at the time of manufacturing the drawn wire, and performs the identification at the time of processing the drawn wire. There is a flaw detection marking device for a drawn wire used in a surface flaw detection system that detects a mark for use and identifies a surface flaw portion, a flaw detection means for detecting a surface flaw of a moving drawn wire, and a flaw detection means for the flaw detection means. Marking means for applying an identification mark to a portion of a surface flaw detected by the flaw detection means, which is provided at a subsequent stage, and an entire area of the identification mark provided at a stage subsequent to the marking means; And a marking protection means for applying a transparent and quick-drying protective paint, so that when a flaw of the drawn wire is detected, a mark for identification is formed on the flaw part, and thereafter, the transparent mark is formed. Quick drying The protective paint may be applied so as to cover the entire area of the identification mark.

For this reason, since the identification mark applied to the surface of the drawn wire is protected by the quick-drying protective paint,
Even if the drawn wires come into contact with each other, peeling of the identification mark is effectively prevented. Therefore, the drawn wire rod that moves at a high speed can be immediately wound on a roll.

In addition, since the protective paint according to the present invention is a transparent paint that does not hinder detection of the identification mark in the mark detection step, the identification mark detection step can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a drawing manufacturing apparatus incorporating a flaw detection marking device of the present invention and a product manufacturing line such as a bolt, FIG. 2 is a schematic configuration diagram of a marking means, and FIG. FIG. 4 is a cross-sectional view schematically showing a spray gun, FIG. 4 is a front view showing an example of a mark applied to a drawn wire and a protective paint, and FIG. 5 is a conceptual configuration showing a process of detecting a mark by a mark detection device. FIG. 22 Wire drawing material, 30 Marking device, 31 Marking protection device, 34 Mark, 35 Protective paint.

Claims (1)

(57) [Claims] An identification mark is applied to a surface flaw portion of a drawn wire at the time of manufacturing the drawn wire, and the identification mark is detected during processing of the drawn wire to identify the surface flaw portion. A flaw detection marking device for a drawn wire used in a detection system, wherein the flaw detection means detects a surface flaw of a moving drawn wire, and the flaw detection means is provided at a subsequent stage of the flaw detection means, and the flaw of the drawn wire, A marking means for applying an identification mark to a surface flaw detected by the detection means, and a protective paint which is disposed at a subsequent stage of the marking means and covers the entire area of the identification mark, and which is transparent and quick-drying. And a marking protection means for applying a coating.