JPS61249796A - Heating-element incorporated engraving-needle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a thermal cutter for cutting or engraving chemical fibers made of styrofoam or heat-melting materials, and in particular to an indirect heating engraving tool with a built-in heating element. Regarding.

[Conventional technology]

1・ Chemical fiber cloth such as Styrofoam and Tetron ■.

Cutting by heating and melting ensures the smoothness of the cut surface and prevents the threads from unraveling, especially at the edges of the cloth.

It has been well known and used for its effect of stopping.

It was getting worse.

Furthermore, in recent years, styrofoam has come into widespread use as a material for making letters, modeling, arts and crafts, and exhibitions.

Styrofoam can be cut using thread.

The usual method has been to replace the saw blade with a heater such as a nichrome wire, heat it by applying electricity to both ends of the saw, and then push the heater against the Styrofoam to cut the saw.

However, in order to cut out the middle of the Styrofoam board, the heater □ - had to be removed and reset each time using the scroll saw method.

An invention made for the purpose of eliminating this inconvenience of resetting (
Japanese Patent Publication No. 55-28840'') (hereinafter referred to as Invention A).

[Six problems that the invention attempts to solve] 2.1 In this invention A, the heat cutter is a so-called drill.

Since it is a mold, it must be reset each time the board is bored.

It is very convenient and improved, but no problem.

is that the amount of power consumption is large.

A part of the cutter of the invention A is made of stainless steel with a diameter of about 1 mm.

The pipe itself is used as a heat generating heater, and an insulated conductor is passed through the inside of the pipe, so that it is energized.

This is due to the cutting method using a direct heating heater.

In other words, in order to improve workability (cutting and processing Styrofoam), it is necessary to heat a part of the cutter to 300°C to 500°C. 5 vo to heat to
It was necessary to apply a current of 10 to 15 A.

If the pipe was made of nichrome alloy instead of a stainless steel pipe, the electrical resistance would be high, so a current of 2 to 3 A would be sufficient, but the pipe would soften and bend, making it unusable. On the other hand, stainless steel pipes do not soften, but they consume a large amount of current, so if you use them for a long time, they will suffer from electrolytic corrosion due to the high current and high temperatures.

It became clear that the plastic was severely oxidized and could not withstand long-term use.

In addition, other times due to the large current value.

The problem is going cordless, i.e. battery-powered 1 - when scrubbing -
The battery consumption is extremely high and it is not practical.

[Means to solve the problem]

The present invention prevents the heating element 1 from oxidizing and generates heat by incorporating the heating element 1 into the metal pipe 2.

Since a high-resistance element such as a nichrome alloy wire can be used as the heating element 1, the current value can be reduced.

We were able to solve the conventional problems.

The details will be described below.

(Structure) As shown in Fig. 1, the heating element 1 is made of a nichrome alloy wire or platinum wire with high heat generation efficiency, and electrophoresis is used to prevent the heating element 1 from oxidation and to serve as heat-resistant insulation (800°C or higher). The metal pipe 2 becomes a conductor for electricity, and one end is connected to a heating element 1 and a welded part 4 for electricity.

are connected to each other. The welding part 4 is made by cutting the end face of a 2° metal pipe diagonally and welding (spot welding).

It is Sukushi.

Further, the heating element 1 is heated to a high temperature by supplying electricity to the heating element 1.

Then, the air inside the metal pipe 2 expands, increasing the internal air pressure and causing distortion in the metal pipe 2, which breaks the electrical connection between the heating element 1 and the metal pipe 2.

It is necessary to allow the expanded water to escape outside the metal pipe, as this can cause malfunctions. In the present invention, a gap is left as the air hole 5 for releasing the expanded air so that the end opening of the metal pipe 2 is not sealed.

Furthermore, a ceramic coating agent is applied to the surface of the metal pipe 2 to prevent oxidation caused by high heat.

The metal pipe 2 and the connecting fitting 6 are press-fitted and fixed by a press-fitting spring 7.

Further, the diameter of the metal pipe 2 is tapered so as to gradually decrease from the root where the press-fitting spring 7 is inserted toward the tip.

The reason is that the tapered structure provides mechanical strength.
・The tip of the door broke or bent while I was working on it.

and the heating element 1 and metal pipe 2 at the tip.

The gap narrows and the temperature at the tip becomes high and thin.

It has the effect of making paddling work easier.

The base of the heating element 1 is a hollow male connector for energizing.

It is inserted into the section and fixed by pressure contact. The connecting fitting 6 and the male connector 8 for conducting electricity are electrically connected to prevent short circuits.

It is partitioned by an insulating plate 9 made of an insulating material. Also.

An insulating plate 9 is fixed to the connection fitting 6.

A fixing caulk 10 is provided for this purpose, and a spring effect is provided to ensure the connection with the power supply connector.

The notch 11 is also made.

(Colloidal Ceramic Film Electrodeposition) Brushing, dipping, etc. are generally used as a method to uniformly apply a colloidal ceramic film to the surface of the heating element 1. In the case of a rod, it can be applied evenly, but if the wire diameter is 0.1~
It was impossible to apply uniformly with the conventional method when the diameter was as small as 0.2 pus.

In the present invention, colloidal ceramics are uniformly applied to a small diameter heating element having a diameter of 0.1 to 0.2 to form a coating.

We have found that electrophoresis is the most suitable method for this purpose. The electrodeposition conditions for uniform coating will be described below. .

(Example) Using a 0.2 mφ nichrome wire as the heating element 1, alumina sol (Osan Chemical Colloidal Alumina #200) 1
00 g, electricity was applied at a rate of 600 wn/sec into a solution consisting of 3 g of aluminum methylate, 5 g of gum arabic, 1 g of polyvinyl alcohol, and 150 g of ion-exchanged water.
, using a nichrome wire as an anode and a titanium metal plate as a cathode, electrodeposition was performed at 50 to 100 volts to give about 10
A uniform electrodeposited film with a thickness of 0 μm was obtained.

Alcohol soluble C as ceramic coating solution
In the case of ERAC (manufactured by Kokusai Engineering Trading Co., Ltd.), the nichrome wire is electrolyzed for several seconds at 55 volts of direct current using the nichrome wire as a cathode to degrease the wire before electrophoresis.

(Heat-resistant insulation coating) A colloidal ceramic film is electrodeposited on a nichrome wire and then dried at 60 to 80°C to coat unnecessary parts with ceramic.

Remove the box film with a knife or file, insert it into a metal pipe, and spot weld at the welding part 4. .

After spot welding, it is baked at 150°C or higher for 1 hour to solidify.

(Oxidation-resistant and heat-resistant treatment of metal pipes) The metal pipe 2 to which the heating element 1 has been spot-welded is coated with a commercially available ceramic coating agent (for example, "Aron Ceramic Coating C" by Toagosei Kagaku Kogyo Co., Ltd., Chemitronics Co., Ltd. When the metal pipe was soaked in "Hard Coating Agent" (CERACJ) from Kokusai Gijutsu Co., Ltd., allowed to dry naturally, and then baked and solidified at 150°C, it was possible to form an oxidation-resistant and heat-resistant coating on the surface of the metal pipe.

Fig. 2 shows the engraving tool 13 to which the engraving needle 12 with a built-in heating element of the present invention is attached, 14 is the energizing switch, 15 is the power cord, the power source is a transformer with a voltage of 3 to 5 volts, and a current of 1
~3A.

The magnitude of this voltage and the magnitude of the current value are set depending on the magnitude of the resistance of the heating element 2 and the heating temperature.

(Metal pipes with built-in heating elements of various shapes) Styrofoam can be processed into a variety of shapes, including triangular grooves.

Various shapes such as circular grooves, U-shaped grooves, etc. are required depending on the purpose and use.

In order to meet these demands, the present invention provides metal pipes with built-in heating elements of various shapes.

The one shown in Figure 3 is used to freely cut polystyrene foam, urethane foam, etc. into any shape.

With the engraving needle 12 with a built-in heating element, ■-shaped grooves! The engraving needles used are 16 for this engraving, 17 for engraving U-shaped grooves, 18 for wave engraving, and 19 for engraving semicircular or circular grooves.

These are manufactured by inserting a heating element coated with a ceramic film before firing into the hollow part of a metal pipe 2 formed as in 16.17.18.19, and heating it to about 150 DEG C. after insertion. Since the ceramic coating before firing is flexible, it can be inserted freely into pipes of various shapes.

FIG. 4 shows a tabletop engraving device, which is equipped with a voltage regulator 20 so that the heating temperature of the engraving 8 and snoring 12 with built-in heating elements can be freely changed from 80°C to 800°C. 21 is a flat plate table for placing the workpiece, 12 is an engraving needle with a built-in heating element of the present invention, and 22 is 1
2 is a mounting hole, 23 is a power switch, and 15 is a power cord.

Of course, the power cord 15 shown in FIGS. 2 and 4 is unnecessary if the power source is a battery.

'2τ2222, --. 't'-tyn'v+n. 8,1□26□.

Even if heated to over 600℃, the heating element will not break due to oxidation.
It was possible to obtain a carving tool with a long life and a high working speed without causing oxidation on the surface of the single-wire metal pipe.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing one embodiment of the present invention, Fig. 2 is an engraving tool to which the engraving needle with a built-in heating element of the present invention is attached, and Fig. 3 shows various types of engraving needles with a built-in heating element formed into arbitrary shapes. Example, 4th
The figure is an embodiment of a tabletop type using an engraving needle according to the present invention. 1... Heating element 2... Metal pipe 3...
・Ceramic heat-resistant insulation coating 4...Welding part 5...Air hole 6...Connection fittings 7...Spring for press-fitting 8...Male connector for energization 9...Insulating plate 10...Fixing caulking 11
...Spring effect practical cut 12...Engraving needle 1 of the present invention
3... Engraving tool 14... Energization switch 1
5...Power cord 16...5-shaped engraving needle 17...U-shaped engraving needle 18...Wave-shaped engraving needle 19...Circular engraving needle 20...Voltage regulator 21
... Placement flat plate base 22 ... Engraving needle attachment hole 23
...Power switch. 11°

Claims (1)

[Claims] A heating element 2 whose surface is coated with colloidal ceramics and an insulating film formed by electrodeposition by electrophoresis is inserted into the metal pipe 1, and the end of the heating element 2 and the tip of the metal pipe are electrically connected and heated by energization. A built-in heating element is constructed such that the heating element 2 and the other end of the metal pipe 1 are electrically insulated from each other by a connecting jig which serves both to supply power and to hold the respective other ends of the heating element 2 and the metal pipe 1. engraving needle.