JPS58123833A - Method and device for quickly quenching liquid phase metal or metal alloy on band - 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] The present invention relates to rapid or super hardening techniques on strips.

According to the invention, a liquid of super-hardening agent (metal or metal),
・The body jet is injected onto a rotating strip of material, generally made of gold S, which is transported by commercial transport. At the point of contact between the jet and the strip, very rapid cooling (10° C./sec) occurs, resulting in thinning of the tape.

1/#. In order for chestnuts to be harvested continuously, the heat given by the processing agent to the rotating Teizoku must be kept at 14M.
It is better to remove it. In fact, without special care, this heat can impair the quality of the material obtained, cause a rapid breakdown of the strip, and cause a production stoppage due to the tape sticking to the strip.

Various methods have already been proposed for rolling and cooling the strip. Using a cold body injected onto the strip on the shaft, for example using a gas-cushioned caisson with a Coanda effect, such as that described in French Patent Application No. 8015918 filed July 18, 1980. There are methods.

These methods h however super hardening agents tltlli
As soon as l increases, larger equipment is required.

In order to avoid this drawback 1, the present invention uses the η method in which a rotating strip is sprayed with a liquid in the form of faint droplets, preferably water.

Therefore, the present invention provides a method for super-hardening a metal or an all-alloy by injecting a Km-shaped jet of super-hardening agent onto a rotating steel sheet, which is sent at a heavy speed. The primary aim is to improve the cooling method by means of a jet of liquid, especially water.

Although this technique is well known in other industrial sectors, some precautions are required in the art sector.

In fact, according to nine tests conducted by the present inventor, if the surface of the rotating band material receiving the hot liquid jet leaves traces of water, the water contacts the jet and evaporates, causing a thermal foaming phenomenon. This has been shown to prevent contact between the treatment agent and the strip, thus preventing the formation of a superhardened tape. By the way, if the surface of the strip is wet when the spray is carried out to cool it, it will be wetted before the strip is again subjected to the hot liquid jet, i.e. within a very short time (e.g. and -f: A 4m long iron 11l rotating at a speed of 30m/sho
It has also proven extremely difficult to dry the strip (approximately one-tenth of a second per rvc). Furthermore, it is clear that this same surface must be rounded and maximally protected against oxidation in order to retain its quality during the hardening process.

According to the invention, therefore, water spraying is carried out on the side of the strip opposite to the side on which the contact with the treatment agent takes place.

Furthermore, preferably, in order to prevent the surface of the strip material to be super-hardened from getting wet, a caisson for "A" cushioning due to the Coanda effect is placed facing the strip material, at least in the area where spraying is performed. be done.

It is desirable that a means for discharging excess water, such as a loaf, a brush, and a suction port, be arranged in the direction of movement of the strip below the spraying means, and in order to reduce the effects of Coanda □ ・1. Preferably, the cushioning caisson extends into the area where these means are located.

Furthermore, the temperature of the strip material is the boiling temperature If of the ejected liquid.
It is possible to adjust the flow sensitivity of the spraying device so that it does not drop below (100° C. in the case of water), ie the strip does not get wet. The rollers and brushes therefore mainly move during the adjustment phase, and their movement primarily serves as a safety device.

In order to remove any traces of cooling liquid, a vacuum box placed downstream of another evaporator (rollers and brushes) has been successfully used. This vacuum box contains two slits with a cross-section very close to the wT plane of the strip which allows the passage of the strip with very little air inflow.

Furthermore, the entire cooling shell is placed inside the Kutani vessel under a false pressure reduction, which prevents the radiation of steam and the injection of coolant to the injection part.

The invention allows very fine control of the temperature of the strip. The temperature of the strip material has been found to be the critical parameter for super-hardening, and the temperature relationship of the strip material is shown for each product, leaving the other parameters unchanged.

Referring to the reason, this device has two pulleys 2. The steel strip 1 is rotated at a constant speed (approximately 40 ?Fl/sheet) on a steel strip 1. One of the two pulleys, preferably downstream 11i#IIF
L2' is fully tensioned and held in the forward direction at a height of 911 m above the suspended material. The super-quenched tape 3 is formed on the upper surface of the strip l by jetting V of the super-quenching agent from a crucible 4 made of heat-resistant barrel material such as silica, which includes an injection port 5. .

Near the injection part of the supergrain insert, in the case of the figure, facing the opposite side of the strip material to the injection surface, there is a first Gunon 6 due to the Coanda effect that securely fixes the material to the buttocks. It is located. Opposed to this goo strip is a flat surface with holes arranged at regular intervals according to the axis of the forest.

The water spray cooling device provided by the present invention is arranged in the example shown below the strip.

This cooling device 1 is arranged opposite to the lower side of the caisson 6 and has a second y-non 11ttb* by the Coanda effect with a geometry similar to the shape of the caisson 6. Air is supplied.

A water spout device 12 is arranged on the caisson 11, near its upstream 11i1 (relative to the movement of the strip), opposite the lower upper surface of the strip.

I! The Jjg+ device has two concentric nozzles, the central nozzle being the liquid T-tube for IIxta, and the externally powered annular nozzle C being for compressed air.

11j Two rows 218 made of hard rubber are arranged on the downstream side of the precision device 12 and are oriented parallel to the strip material.

Instead of or more preferably downstream of the rows 213 of and n, a cylindrical rotary brush 14 rotating in the direction of the arrow f replenishes the dewatering of the strip.

The whole of these devices is preferably placed under the ventilation 7-door 15 with the suction device, the skirt of which connects with the planar part of the caisson.

Furthermore, on the downstream side of the row 213, a decompression caisson 16 having a slit or opening rearranged 11111C in the vicinity of the O-edge of the strip so as to suck in the water discharged toward the edge of the strip by these rollers 13 is installed. Both sides rct! r
:, I'm sad to see it fixed.

As an example, the length is 4 meters, 1lilT surface is 13×
An explanation will be given of this type of apparatus in which a strip material l of 0.8 mm is set. This strip is fed by pulley 2' at a speed of approximately 4 (11/sec).

The flat part of the nine caisson 6 facing towards the sill material l has a length s.
O country, Nobu is 1051. On this surface, @sumi, s are arranged in a row with an interval of 2Is- along the axis of the strip material.
- hole is drilled. Pressurized air is supplied to these holes at a flow rate of approximately tow'' per #L constant time.

The caisson 11 has the same shape as the caisson 6 and is supplied with air under the same conditions.

lI! The one-turn brush 14 has a diameter equal to lOO■.

This setting is sometimes 2F'@ys, s 011 p, Or
l 81@, 4 f It was used for rolling to produce a woody alloy tape.

The conditions in this case are as follows.

-Alloy flow 1i 40 o'clock, 7 o'clock 1 alloy's head = approx. i, goo℃ One jet 111 Distance from the tip of iron holder 13 to strip material 11 &: 1
5+ Single injection 11**Tgo supply 11yk: approx. soJ/hour pressure 11
i1! ! Air: Approximately lO Duck 8/When filling - Roller 13: Distance from the injection device 111g to the first roller 11: Approximately 20 cI
11 - Tape/6 and a... Flea and condensed air;
For each caisson, 10 g 1/min. The temperature of the material (measured with an infrared high temperature needle) is between 260°C and 80°C.
It's disgusting to be included in the darkness of ℃.

Under the above conditions, the alloy I'eys can be superquenched very precisely, with a high speed, extremely stable working condition, and a non-hexameric or low crystallinity ratio. ,s
I was able to get 4 tapes on P, Work &....

[Brief explanation of the drawing]

The figure is an explanatory view showing a specific example of a super hardening apparatus according to the present invention. l... Compensation material, 2. 2'... Pulley, 3... Super hardened tape, 4... Crucible, 5... Injection port, 6.
11... Caisson, 12... Injection device, 13...
Roller, 14... Rotating brush, 16... Decompression caisson.

Claims (1)

[Claims] u) In a method of super-hardening a g-shaped metal or metal alloy by injecting it onto a rotary strip that is fed at high speed, an atomized fi % water by spraying onto the strip, and the flow rate of the atomized liquid is used as a means for regulating the temperature of the strip. (2) The stagnant liquid is sprayed onto a surface of the strip material opposite to the surface on which the liquid metal or metal alloy is sprayed. The method described in Section 1. (3) At the height of the part where the purified liquid is sprayed,
A claim characterized in that a caisson suitable for generating air and body cushioning by Coanda effect rice is placed opposite the surface of the band material on which super-quenching of liquid gold or metal alloy is performed. (4) The flow rate of the liquid spraying means is adjusted so that the temperature of the strip does not fall below the boiling temperature of the liquid.
The method described in any of the paragraphs. (5) Approximate formula Fevs. m Otx Pa Or@J
3io. Claims 1 to 3, characterized in that, in order to obtain a superhardened tape from the alloy of a, the temperature of the strip onto which this alloy is injected is comprised between 60°C and 80°C. The method described in any of the paragraphs. (6) In a metal or metal alloy superquenching apparatus that includes a strip fed at high speed and a means for injecting the liquid metal or alloy onto the strip, atomized liquid, especially water, is used. The above-mentioned device is characterized in that it includes a means for spraying the liquid toward the strip material. A claim characterized in that the direction is determined in the same way as the opposite side of the surface of the band.
tP! includes a caisson that is passed through to create a gas cushion by Coanda seedlings on the surface of the liquid metal or metal alloy to be superquenched. ! An hour hand device according to claim 7. (Shun: There is an extra sac-shaped g
．． 9. A display device according to any one of claims 6 to 8, characterized in that it includes means for discharging. A patent headed by the fact that said y-1 son suitable for creating a gas cushion due to the effect of gas extends at least to the area of said means for draining excess liquid. Apparatus according to claims 8 and 9. (b) The means for discharging the partial liquid is a ventilation tool P equipped with an inhalation device, which connects the skirt portion with the flat part of the caisson through which a gas cushion is created by the young Coanda fruit. 11. Device according to claim 10, characterized in that ζ is arranged below. (vtI) Provided downstream of the said rounding means for discharging excess liquid, a vacuum box having two slits with a mouth surface very similar to the cross section of the strip for passing the strip.
lk. The device according to any one of claims 9 to 11.