JP2001137751A - Nozzle for marking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a marking without twisting the shape of characters and discontinuously applying heat-resistant coatings, even when characters are rapidly marked on a hot member using the corrosive heat-resistant coating. SOLUTION: The nozzle 16 for marking is constituted of a nozzle base 22, a manifold 24 arranged on the nozzle base 22, an air cap 26 arranged at the forward end of the manifold 24 and a drive part 28 for driving a needle. The nozzle base 22 and the manifold 24 which are the constituents of the nozzle 16 with a high weight ratio, are formed of aluminum. Further, a passage hole for coatings in the nozzle base 22, the hollow part of the manifold 24, a communicating hole which makes the hollow part communicate with the passage hole for coatings and the like as parts coming into contact with the liquid, are surface-treated with high correction-resistance and hardwearing effects.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a marking nozzle, and more particularly, to a marking nozzle capable of marking characters or the like at a high speed on a hot member such as a hot billet or a hot coil. .

[0002]

2. Description of the Related Art Hot members such as hot slabs and hot coils are marked with an identification code such as a serial number or an identification number in the manufacturing process, and are used for product identification after cooling. As a method of marking characters and symbols on a hot member, X
A method of attaching a nozzle to a Y scanning mechanism and moving the nozzle in the XY plane according to the shape of the character or symbol to be marked, thereby marking a hot member with a heat-resistant paint sprayed from the tip of the nozzle. is there. The moving speed of the nozzle used in this marking method is determined by the cycle time in a line such as a factory.

The heat-resistant paint used for the above-mentioned marking has aluminum phosphate, a Si-based pigment, and a dispersant as basic components, and a pigment component is deposited on an oxide film on the surface of a hot member formed of aluminum phosphate. The marking is performed by coloring. In other words, heat-resistant paint is acidic (corrosive)
Therefore, the plurality of parts constituting the nozzle are formed of a highly corrosion-resistant material such as stainless steel.

[0004]

Here, when marking a hot billet having a short cycle time, for example, a billet or a shaped steel, it is necessary to move the nozzle at a high speed. For example, when marking five characters including Kana characters having a width of 20 mm and a height of 30 mm within four seconds, the moving speed of the nozzle becomes 200 mm / second or more at the maximum.

[0005] However, the nozzle composed of a plurality of components made of stainless steel is heavy, and the XY scanning mechanism covers the front surface with a water-cooled case in order to protect the material to be marked from radiant heat during heating. Therefore, it is arranged outside the XY scanning mechanism via a nozzle arm or the like (see FIG. 2). When the nozzle is moved in accordance with the character shape, there is no problem when the nozzle is operated at a low speed, but as the marking speed increases, the influence of the inertia of the nozzle during acceleration / deceleration increases, and the nozzle arm is bent. In addition, distortion such as torsion occurs, the nozzle at the tip of the nozzle arm vibrates, the shape of the marked character is distorted, or the heat-resistant paint is discontinuously applied, so that the marked character cannot be read. That is, the reduction in the weight of the nozzle is an important factor at the time of high-speed marking in the marking apparatus of this system. Furthermore, since the nozzle itself is exposed to intense radiant heat during marking, reducing the weight by using components made of a corrosion-resistant resin material has been adopted due to problems in heat resistance and mechanical strength. The current situation is that it cannot be obtained.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems inherent in the prior art, and has been proposed to solve the problem suitably. An object of the present invention is to provide a marking nozzle capable of performing marking without distorting the character shape or discontinuous application of a heat-resistant paint even when marking characters or the like on a member at high speed.

[0007]

[MEANS FOR SOLVING THE PROBLEMS]
In order to suitably achieve the intended purpose, a marking nozzle according to the present invention is a marking nozzle for marking a hot member using a heat-resistant paint, and the nozzle is XY.
In a marking nozzle used for a marking device that moves and marks in accordance with a pattern such as a character or a symbol in a plane, a component is formed of a lightweight metal material, and a liquid contact portion of the component has high corrosion resistance and resistance. It is characterized by having been subjected to surface treatment having abrasion properties.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a description will be given of a marking nozzle according to the present invention with reference to the accompanying drawings by way of preferred embodiments.

FIG. 1 shows a marking nozzle according to an embodiment, and FIG. 2 shows a marking device employing the marking nozzle according to the embodiment. This marking device 10
Is a nozzle arm 14 disposed on the XY scanning mechanism 12.
A nozzle for marking (hereinafter simply referred to as a nozzle) 16 is disposed on the nozzle arm 14, and heat of a hot steel slab or a hot coil made of a material such as tool steel, bearing steel, stainless steel, mild steel or the like is provided. With respect to the marking target portion of the intermediate member 18, the nozzle 16
By moving simultaneously or individually in the −Y direction, an arbitrary character, symbol, or the like can be marked on the portion.

As shown in FIG. 1, the nozzle 16 includes a nozzle base (component) 22 mounted on the nozzle arm 14 via a bracket 20, and a nozzle base 22.
, And an air nozzle 2 disposed at the front end (left end in FIG. 1) of the manifold 24.
6 and a drive unit 28 for driving a needle 42 described later. As shown in FIG. 3, the air nozzle 26 is formed in a frusto-conical shape, and has a hollow portion 26a formed in the inside thereof that is tapered on the front end side and opens forward and backward, and is formed through an injection port 26b at the front end. The heat-resistant paint is configured to be sprayed. Note that in FIG.
Indicates a cover that protects the entire nozzle.

As shown in FIG. 3, a hollow portion 24a communicating with a hollow portion 26a of the air nozzle 26 is formed in the manifold 24, and both hollow portions 26a, 24a are formed.
A nozzle chip 32 is provided inside the nozzle chip 32, and an air passage 34 is defined between the inner surface of the air nozzle 26 and the outer surface of the nozzle chip 32. The nozzle tip 32 is formed with a paint passage 32a which is tapered on the front end side and is opened forward and backward, and the injection port 32b at the front end is disposed coaxially with the injection port 26b of the air nozzle 26 in a front-rear relationship. . The hollow portion 24a of the manifold 24 and the paint passage 32a of the nozzle tip 32 communicate with each other.
4a also serves as a passage (flow area) for the heat-resistant paint.

In the manifold 24, a coil 38 is wound around the outside of the cylindrical sleeve 36 by a required number of turns at a rear portion (right end in FIG. 3) opposite to the position where the air nozzle 26 is provided. The drive unit 28 configured by disposing the magnetic poles 40 is provided. The paint passage 32a of the nozzle tip 32 and the manifold 2
The needle 42 is always urged by a compression spring 44 as an elastic member at the hollow portion 24a of the nozzle tip 4a. 32b is held at a closed position for closing the same. A plunger 46 facing the magnetic pole 40 of the drive unit 28 is provided on the rear end side of the needle 42. When a current flows through the coil 38, the plunger 46 resists the pressing force of the compression spring 44. The needle 42 magnetically attracted to the magnetic pole 40 and fixed to the lower part of the plunger is configured to open the injection port 32b.
In the marking device 10 of the embodiment, the pulse is controlled so that the current flows intermittently to the coil 38 at the time of marking, so that the needle 42 is set to open and close the injection port 32b of the nozzle tip 32 intermittently.

As shown in FIG. 3, the nozzle base 22 has an air through hole 22a communicating with the air passage 34 and a paint through hole 22b communicating with the paint passage 32a through a hollow portion 24a. Drilled and each through hole 22
Reference numerals a and 22b are connected to an air supply source and a paint supply source (not shown) via connection members such as hoses. The heat-resistant paint supplied from the paint supply source to the paint passage 32a is sucked and atomized by the suction force of the air supplied from the air supply source to the air passage 34 and ejected from the ejection port 26b of the air nozzle 26 ( The so-called air atomizing method)
And it is comprised so that it may inject through the injection opening 26b of the air nozzle 26. The paint through hole 22b formed in the nozzle base 22 includes an outward path and a return path (not shown), and the heat-resistant paint circulates between the paint supply source and the paint passage 32a through the paint through hole 22b. The injection port 32 b of the nozzle tip 32 is configured by the needle 42.
Is injected only when is released.
Incidentally, as the heat-resistant paint, as an example, the viscosity: 6
1-63 KU value / 25 ° C., particle diameter: 10 microns, pH: 1.5-2.0, specific gravity: 1.57-1.60, application temperature: 200-1050 ° C. .

Of the components constituting the nozzle 16,
Nozzle base 22 and manifold 2 with large weight ratio
Numeral 4 is made of aluminum as a lightweight metal material, and is configured to reduce the weight of the entire nozzle. Liquid-contacting parts (areas through which the heat-resistant paint flows) such as the paint through-hole 22b of the nozzle base 22, the hollow part 24a of the manifold 24, and the communication hole 24b that communicates the hollow part 24a with the paint through-hole 22b. Surface treatment with high corrosion resistance and abrasion resistance. That is, a high-corrosion-resistant and abrasion-resistant surface film 48 having a required thickness is formed on the liquid contact portion.

As a surface treatment method for improving corrosion resistance and wear resistance of a metal, for example, there is a hard chromium plating method. In this method, first, a pretreatment is performed with an alkaline treatment liquid for the purpose of degreasing, removing oxides, and imparting roughness. Thereafter, a strong intermediate layer film having good electrical conductivity suitable for plating is formed by anodization or the like, and finally the uppermost film is formed by hard chrome plating or the like. However, with marking nozzles that have been surface-treated by conventional surface treatment methods including hard chrome plating, the surface film is polished and peeled off due to the abrasion caused by the Si pigment in the heat-resistant paint that circulates constantly, and the surface film is thus peeled off Corrosion due to phosphoric acid in the heat-resistant paint progresses from the part where the heat resistant paint has been applied, and there is a durability problem that the nozzle becomes unusable.

Therefore, a film suitable for the surface film of the heat-resistant paint in the hot-marking nozzle was examined after repeated trials. As a result, a nickel alloy-based film was formed by electroless plating. The surface coating was found to be able to withstand applications.

The electroless plating method is a plating method utilizing reduction by a contact action on the surface of a material, and a film is formed by immersing a material in a plating solution comprising a metal salt, a reducing agent, and an additive for a certain period of time. Is what you do. In this electroless plating method, compared to the electrolytic plating method typified by the hard chromium plating method, it is possible to perform plating with a uniform thickness on a concave portion, a narrow through hole portion, and an edge portion. In addition, it has a fine multilayer structure formed in parallel with the base metal, and has a property of blocking corrosion due to the entry of corrosive gas. For this reason, while improving corrosion resistance, it is possible to dramatically improve hardness and wear resistance. And the surface film formed in this way has excellent properties of twice the abrasion resistance and twice the hardness as compared with the film formed by the conventional hard chrome plating method, and is included in the heat-resistant paint. Corrosion resistance to phosphoric acid is more than 10 times better.

The surface treatment is not limited to the electroless plating method, and any other method can be used as long as the surface film 48 for improving the corrosion resistance and the abrasion resistance can be formed on the target portion. Can be adopted.

Here, the heat-resistant paint comes in direct contact with the paint passage 32a of the needle 42 or the nozzle tip 32, but since the weight ratio to the nozzle itself is small, the material for forming the material is not limited to a lightweight metal material, and is not resistant to corrosion. A material that is particularly excellent in wear resistance is appropriately used. The air nozzle 26 is also required to have corrosion resistance in order to prevent the heat-resistant paint from being scattered, but is not required to have high abrasion resistance. Therefore, the material for forming the air nozzle 26 is not limited to a lightweight metal material, and an appropriate material is used.

[0020]

Next, the operation of the marking nozzle according to the above-described embodiment will be described. At the time of marking by the marking device 10, the air is supplied to the air passage 34 of the nozzle 16 and the heat-resistant paint is supplied to the paint passage 32a. Move in the XY directions.
At this time, by controlling the pulse of the driving unit 28, the needle 42 intermittently opens the injection port 32b of the nozzle tip 32, whereby the heat-resistant paint supplied to the paint passage 32a by the suction force of the air. Is sucked out and atomized, and is ejected from the ejection ports 32b and 26b, so that the hot member 18
An arbitrary character or symbol is marked on the marking target portion.

In this case, since the nozzle base 22 and the manifold 24, which are components having a large weight ratio, are formed of lightweight aluminum, the overall weight of the nozzle 16 is reduced. I have. Therefore, even if the nozzle 16 is moved at a high speed in the X-Y direction at the time of marking, the inertia thereof is small, so that the nozzle 16 does not vibrate and the character shape is distorted and the heat-resistant paint is not discontinuously applied. Can be improved. That is, for example, 70 to 270 m
Small characters, symbols, and the like can be accurately marked on a marking target portion having a size of m. Moreover, since the speed can be increased without lowering the marking quality,
Work efficiency can be improved.

Since a surface coating 48 having high corrosion resistance and abrasion resistance is formed by a surface treatment on a liquid contact portion of the nozzle base 22 and the manifold 24 made of aluminum, a heat-resistant paint having excellent corrosion resistance is formed. The required and sufficient durability is secured.

[0023]

[Test example] Nozzle in which the nozzle base and manifold are made of surface-treated aluminum (Invention example)
In comparison with a nozzle made of stainless steel (conventional example), the weight was reduced to about 1/3. The durability was almost the same. Then, using the nozzle according to the invention and the nozzle according to the related art, a predetermined character is placed on the hot member for about 200 m.
As a result of marking by operating the nozzle at a high speed of m / sec, as shown in FIG. 4A, in the conventional example, the heat-resistant paint was discontinuously applied due to the vibration due to the inertia of the nozzle, and an abnormality occurred in the character shape. However, in the example of the invention, as shown in FIG. 4 (b), the heat-resistant paint was continuously applied and a normal character shape was marked.

[0024]

[Modification] In the above-described embodiment, the case where the manifold and the nozzle tip are formed as separate bodies has been described. However, both may be integrated. That is, in this case, the hollow portion of the manifold and the passage for the paint are subjected to a surface treatment for improving high corrosion resistance and wear resistance. In addition, it is also possible to adopt a configuration in which an air passage and a paint passage are formed in the manifold by integrally forming the air cap in the manifold.

[0025]

As described above, according to the marking nozzle of the present invention, the components of the nozzle are made of a lightweight metal material having a surface treatment with high corrosion resistance and abrasion resistance applied to the liquid contact portion of the heat-resistant paint. Since it is configured to be formed, it is possible to withstand the use of heat-resistant paint and to reduce the weight. Therefore, even if the nozzle is moved at high speed during marking, the inertia is small, so that the vibration can be suppressed low, and the distortion of the character shape and the discontinuous application of the heat-resistant paint can be prevented. , Can improve marking quality. In addition, since the speed can be increased without lowering the marking quality, the work efficiency can be improved.

Further, by using aluminum as the lightweight metal material, a remarkable weight reduction can be achieved as compared with the case where stainless steel is used. In addition, the surface film formed on the liquid contact portion by the electroless plating method can dramatically improve the hardness and the wear resistance. Furthermore, by using an air atomizing method, the heat-resistant paint supplied to the paint passage is sucked and atomized and applied to the hot member by the suction force of the air supplied to the air passage and ejected from the injection port. , Small characters and symbols can be clearly marked.

[Brief description of the drawings]

FIG. 1 is a side view showing a marking nozzle according to a preferred embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a marking device employing a marking nozzle according to an embodiment.

FIG. 3 is a sectional view of a main part of a marking nozzle according to an embodiment.

FIG. 4 is an explanatory diagram showing an example of characters marked using the nozzle of the conventional example and the nozzle of the invention example.

[Explanation of symbols]

 Reference Signs List 18 Hot member 22 Nozzle base (component) 22b Paint through hole 24 Manifold (component) 24a Hollow portion 24b Communication hole 26b Injection port 32a Paint passage 34 Air passage 48 Surface coating

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Kazushi Hattori 190, Horinouchi, Hachiman, Chita-shi, Aichi (72) Inventor Yasuaki Ichise 4-chome 3-14, Mejirodai, Hachioji-shi, Tokyo (72) Inventor, Daiwa Komino Tokyo 4-14-29 Ishikamidai, Tokyo Nerima-ku F-term (reference) 2C056 HA19 4F033 AA01 FA00 NA01 QB02Y QB03X QD04 QD20 4F035 AA03 CD03 CD05

Claims (3)

[Claims] 1. A marking nozzle for marking a hot member (18) using a heat-resistant paint, the nozzle being X-shaped.
In a marking nozzle used for a marking device that moves and marks in accordance with a pattern of characters or symbols in a Y plane, a component (22, 24) is formed from a lightweight metal material, and the component (22, 24) is formed. 24. A marking nozzle, characterized in that the liquid contact portions (22b, 24a, 24b) in (24) are subjected to a surface treatment having high corrosion resistance and wear resistance. 2. The lightweight metal material is aluminum, and a nickel alloy-based film is formed by lamination using an electroless plating method, so that the liquid contact parts (22b, 24a, 24b) have high corrosion resistance and wear resistance. The marking nozzle according to claim 1, wherein a surface film (48) having a property is formed. 3. An air passage (34) and a paint passage (32a) are formed in the component (24), and air supplied to the air passage (34) and ejected from an ejection port (26b) is provided. The marking nozzle according to claim 1 or 2, wherein the heat-resistant paint supplied to the paint passage (32a) is sucked out and atomized by a suction force generated by the above, and is applied to the hot member (18) for marking.