JP2001087681A - Marking nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a marking free from such defects as a distorted character form or the discontinuous application of a heat-resistant coating, even when characters and the like are marked on a hot rolled member at a high speed using the corrosive heat-resistant coating. SOLUTION: A marking nozzle 16 is structured 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 whose weight ratio as the constituents of the entire nozzle 16 is high, are formed of titanium or a titanium alloy.

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 A hot member such as a hot billet or a hot coil is marked with an identification code such as a serial number in a manufacturing process and is used for product identification after cooling. As a method of marking letters and symbols on the hot member, there is a method of manually punching a punch engraved with necessary letters and symbols with a hammer. However, since the object to be marked is a hot member having a high temperature, the working environment is poor and the work is severe for the worker.

[0003] Therefore, a nozzle is mounted on an axis capable of mechanical scanning in the XY directions with respect to the hot member, and the nozzle is operated in accordance with the shape of the character or symbol to be marked, so that the nozzle is ejected from the tip. An apparatus for marking a hot member with a heat-resistant paint has been proposed. By using this device, the worker does not need to approach a hot member having a high temperature (for example, 700 to 1000 ° C.) to perform the work, so that the working environment can be improved and labor can be saved.

[0004]

The heat-resistant paint used in the above-mentioned marking device is aluminum phosphate, Si-based pigment,
A dispersing material is used as a basic component, and a pigment component is deposited on an oxide film on the surface of a hot member formed of aluminum phosphate to be colored and marked. That is,
Since the heat-resistant paint is acidic (corrosive), a plurality of parts constituting the nozzle are generally formed of a material having high corrosion resistance such as stainless steel.

However, a nozzle composed of a plurality of components made of stainless steel is heavy, and there is no problem in operating the nozzle mechanically at a low speed to mark large characters and the like. When marking small characters, etc. by operating, the influence of inertia increases due to the heavy nozzle, the nozzle vibrates, the character shape is distorted, and the heat-resistant paint is applied discontinuously, making it impossible to read. Causes the following disadvantages. Since the nozzle itself is exposed to intense radiant heat during marking, reducing the weight by using a component made of a corrosion-resistant resin material cannot be adopted because there is a problem with heat resistance. It is the current situation.

[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]
To suitably achieve the intended purpose, the marking nozzle according to the present invention is a marking nozzle for marking a hot member using a heat-resistant paint, and a component that constitutes a flow path of the heat-resistant paint. , Made of titanium or a titanium alloy.

[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
Has a mounting shaft 14 disposed on the scanning device 12, and the mounting shaft 14 has a marking nozzle (hereinafter simply referred to as a nozzle).
16 are provided, tool steel, bearing steel, stainless steel,
The nozzle 16 is positioned on a marking target portion of a hot member 18 such as a hot billet or a hot coil made of a material such as mild steel.
Is operated in the X-Y direction in accordance with the shape of a character, a symbol, or the like, whereby any 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 mounting shaft 14 via a bracket 20, and a manifold (component) provided on the nozzle base 22. 24 and manifold 2
4 basically includes an air cap 26 disposed at the front end (left end in FIG. 1) and a driving unit 28 that drives a needle 42 described later. As shown in FIG. 3, the air cap 26 is formed in a frusto-conical shape, and a hollow portion 26a which is tapered at the front end side and is opened forward and backward is formed inside the air cap 26, and is formed through an injection port 26b at the front end. And the heat-resistant paint is 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 cap 26 is formed in the manifold 24, and both hollow portions 26a, 24a are formed.
a inside the nozzle cap 32, and the air cap 2
An air passage 34 is defined between the inner surface of the nozzle 6 and the outer surface of the nozzle cap 32. The nozzle cap 32 is formed with a paint passage 32a which is tapered on the front end side and is opened forward and backward.
Are arranged in a front-to-back relationship with the injection port 26b of the air cap 26. The hollow portion 24a of the manifold 24 communicates with the paint passage 32a of the nozzle cap 32, and the hollow portion 24a also serves as a flow path of the heat-resistant paint. The manifold 24 has a through hole 22 b for paint, which will be described later, formed in the nozzle base 22 and a hollow portion 24.
a communicating hole 24 which is a communication route for heat-resistant paint,
b is formed.

A coil 38 is wound around the manifold 24 at a rear portion (right end in FIG. 3) opposite to the position where the air cap 26 is disposed, outside the cylindrical sleeve 36 by a required number of turns. A drive unit 28 configured by disposing a connector 40 therein is disposed therein. A needle 42 is disposed movably in the axial direction in the paint passage 32a of the nozzle cap 32 and the hollow portion 24a of the manifold 24. The needle 42 is always attached to a compression spring 44 as an elastic member. The nozzle cap 32 is urged to hold the injection port 32b of the nozzle cap 32 at a closed position. A plunger 46 facing the connector 40 of the drive unit 28 is provided at the rear end of the needle 42. When a current flows through the coil 38, the needle 42 and the plunger 46
The connector 40 is magnetically attracted against the resilience of No. 4 to open the injection port 32b. In the marking device 10 of the embodiment, the coil 38
By controlling the pulse so that the current flows intermittently with respect to the
Is set to open and close intermittently.

As shown in FIG. 3, the nozzle base 22 has an air through hole 22a communicating with the air passage 34 and a communication hole 24b and a hollow portion 24 with the paint passage 32a.
In addition, a paint through hole 22b communicating with the through hole a is formed, and the through holes 22a and 22b are connected to an air supply source and a paint supply source (not shown) through a connection member such as a hose. ing. Then, the air is supplied from the air supply source to the air passage 34 and the injection port 26 b of the air cap 26 is provided.
The heat-resistant paint supplied from the paint supply source to the paint passage 32a is sucked out and atomized by the suction force of the air injected from the nozzle.
(The so-called air atomizing method), and the injection port 32b of the nozzle cap 32 and the injection port 2 of the air cap 26 are formed.
6b. In addition, the paint through-hole 22b as a flow path of the heat-resistant paint formed in the nozzle base 22 includes an outward path and a return path.
A paint supply source and a paint passage 32 through the paint through hole 22b.
a, and the fuel is injected only when the injection port 32b of the nozzle cap 32 is opened by the needle 42. Incidentally, as the heat-resistant paint, as an example, viscosity: 61-63 KU value / 25 ° C., particle diameter: 10 μm, pH: 1.5-1.5
2.0, specific gravity: 1.57-1.60, application temperature: 200-
Those having characteristics of 1050 ° C. are used.

Here, in order to prevent the nozzle 16 from vibrating largely due to inertia at the time of marking by the marking device 10, reducing the weight of the nozzle 16 is an effective means. Therefore, the inventor can endure the use of heat-resistant paint as a material of components such as the nozzle base 22 and the manifold 24 which constitute a flow path of the heat-resistant paint and have a large weight ratio to the entire nozzle, and can reduce the weight. The trial was repeated for material. First, with respect to metals, ceramics and resins, tests were conducted on various characteristics shown in Table 1 to determine whether or not they were suitable as materials for component parts. As a result, comprehensive evaluation confirmed that the metal was excellent.

[0015]

Next, the inventor repeated the trial for the most suitable material for the type of metal. However, due to the structure for operating the needle 42 by magnetic action as in the embodiment,
Considering that it is essential that at least the material of the manifold 24 is a nonmagnetic metal, stainless steel (SUS316), aluminum, copper, titanium (pure titanium) and titanium alloy (Ti-6Al-4V) shown in Table 2 are used. The test was performed for each characteristic. As a result, comprehensive evaluation confirmed that titanium and titanium alloy were excellent. That is, in the case of the nozzle 16 using a corrosive heat-resistant paint, simply achieving weight reduction is not sufficient, and it is necessary to have both corrosion resistance and wear resistance. Titanium and titanium alloy satisfy this point. Things.

[0017]

It is also possible to apply a surface treatment for improving corrosion resistance and abrasion resistance to a channel through which a heat-resistant paint of a component made of aluminum, which is excellent in weight reduction, flows. However, abrasion caused by particles in the heat-resistant paint that constantly circulates in the path of the nozzle 16 may cause the surface treatment film to peel off when used for a long time, exposing aluminum as a base material and causing corrosion. However, titanium and titanium alloys are excellent in wear resistance and therefore have high durability, and do not require secondary treatment such as surface treatment, so that the cost can be reduced.

Therefore, in the embodiment, of the components constituting the nozzle 16, the nozzle base 22 and the manifold 24 having a large weight ratio are formed of titanium or a titanium alloy so as to reduce the weight of the entire nozzle. is there. When comparing titanium and a titanium alloy, the strength (tensile strength) of titanium is 35 to 63 kgf / mm ² , whereas the strength (tensile strength) of the titanium alloy of Ti-6Al-4V is 91%. １127 kgf / mm ² , and the titanium alloy is excellent in strength.

The heat-resistant paint comes into direct contact with the paint passage 32a of the needle 42 and the nozzle cap 32. However, since the weight ratio to the nozzle itself is small, its material is not limited to titanium or a titanium alloy. A material that is particularly excellent in wear resistance is appropriately used. The air cap 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.

[0021]

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, while supplying air to the air passage 34 of the nozzle 16 and supplying heat-resistant paint to the paint passage 32 a, the nozzle 16 is shaped according to the shape of the character or symbol to be marked. To operate in the XY directions. At this time, by controlling the pulse of the driving unit 28, the needle 42 is connected to the injection port 3 of the nozzle cap 32.
2b is opened intermittently, whereby the heat resistant paint supplied to the paint passage 32a is sucked out by the suction force of the air.
It is atomized and injected from the injection ports 32b and 26b, and arbitrary characters and symbols are marked on the marking target portion of the hot member 18.

In this case, in the nozzle 16 having the above-described structure, the nozzle base 22 and the manifold 24, which are components having a large weight ratio, are formed of titanium or a titanium alloy which is lightweight and has excellent corrosion resistance and wear resistance. As a result, the overall weight is reduced while ensuring sufficient durability. Therefore, even when the nozzle 16 is operated 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 greatly and the character shape is distorted and the heat-resistant paint is not discontinuously applied. Quality can be improved. That is, for example, small characters, symbols, and the like can be accurately marked on a marking target portion of the hot member 18 having a size of 70 to 270 mm. In addition, since the speed can be increased without lowering the marking quality, the efficiency of the marking operation can be improved.

[0023]

[Test example] The nozzle base and the manifold were replaced with Ti-
When comparing a nozzle (inventive example) made of 6Al-4V titanium alloy with a nozzle (conventional example) made of stainless steel, the weight was reduced by about 20%. The durability has also been improved. Then, using the nozzle of the present invention and the nozzle of the conventional example, a letter "C" is added to the hot member by about 200
As a result of marking by operating the nozzle at a high speed of mm / 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 description has been given of the case where the nozzle base and the manifold having a large weight ratio constituting the nozzle are formed of titanium or a titanium alloy. The nozzle cap and the air cap constituting the mouth and the like may be similarly formed of titanium or a titanium alloy. Further, in the embodiment, the case where the manifold, the nozzle cap, and the air cap are separately formed has been described, but the nozzle cap is formed integrally with the manifold, or both the caps are formed integrally with the manifold. Is also good. That is, when both caps are integrally formed on the manifold, the manifold as a component is formed with a communication hole, a hollow portion, a passage for paint, an injection port, and the like as a flow path of the heat-resistant paint, and is used for air. A passage is also formed. The titanium alloy forming the constituent parts is not limited to Ti-6Al-4V of the embodiment, and an alloy obtained by adding other elements to titanium can be appropriately used. In order to further improve the wear resistance of titanium and a titanium alloy, a nitriding treatment may be performed.

[0025]

As described above, according to the marking nozzle according to the present invention, since the components of the nozzle constituting the flow path of the heat-resistant paint are formed of titanium or a titanium alloy, the composition of the heat-resistant paint is improved. It can withstand use and achieve weight reduction. Therefore, even when the nozzle is operated 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. Moreover, since the speed can be increased without lowering the marking quality,
Work efficiency can be improved.

Also, an air atomizing system is employed in which the heat-resistant paint supplied to the paint passage is sucked out and atomized by the suction force of the air supplied from the injection port and supplied to the air passage and applied to the hot member. By doing so, 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]

 18 Hot member 22 Nozzle base (component) 22b Paint through-hole (heat-resistant paint distribution channel) 24 Manifold (component) 24a Hollow portion (heat-resistant paint distribution channel) 24b Communication hole (heat-resistant paint distribution channel) 26b Injection port 32a Paint passage 34 Air passage

Claims (2)

[Claims] 1. A marking nozzle for marking a hot member (18) using a heat-resistant paint, comprising a component (22, 24) constituting a flow path (22b, 24a, 24b) of the heat-resistant paint. And a marking nozzle formed of titanium or a titanium alloy. 2. An air passage (34) and a paint passage (32a) are formed in the component part (24), and air supplied to the air passage (34) and injected from an injection port (26b) is provided. The marking nozzle according to claim 1, wherein the heat-resistant paint supplied to the paint passage (32a) is sucked and atomized by a suction force of the paint and applied to the hot member (18) for marking.