KR100762463B1 - Grease supply apparatus for edge part of work roll - Google Patents

Abstract

A grease supply apparatus for an edge part of a work roll is provided to supply grease to the edge part automatically, and to prevent a grease oil film of the edge part from being damaged by diffusing the grease on an outer peripheral surface of the roll while the work roll is rotated. A work roll(200) includes a grease supply pipe(211), a rotary part(210), grease retention grooves(220), work roll grease supply paths(230), grease supply recessed grooves(240), and a grease supply part(250). A rotary shaft(222) of the work roll is inserted in the rotary part. The grease retention grooves are circularly recessed on two sections(221) of the work roll on the rotary shaft to be communicated with the grease supply path of the rotary part. The work roll grease supply paths are communicated with the grease retention grooves and formed in an outer peripheral surface from both sections of the work roll to the longitudinal direction. The grease supply recessed grooves are formed along the edge part of the outer peripheral surface of the work roll. The grease supply part has discharge holes to communicate the work roll supply path with the grease supply recessed grooves.

Description

Grease supply apparatus for edge part of work roll}

Figure 1 (a) is a schematic diagram showing a rolling oil supply device according to the prior art,

       (b) is a schematic diagram of a rolled oil jet nozzle according to the prior art,

Figure 2 is a perspective view showing a work roll edge grease supply apparatus according to the present invention,

3 is a cross-sectional view showing a work roll edge grease supply apparatus according to the present invention.

<Description of Symbols for Main Parts of Drawings>

210: rotary part 211: grease supply pipe

220: grease stay home 230: grease supply

240: grease supply groove 241: grease discharge port

242: grease outlet 245: work roll edge

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a grease supply apparatus for a work roll edge of a rolling mill. More specifically, a grease supply passage is formed inside a grease supply pipe for injecting grease and the grease supply pipe. And a work roll having a rotary part having a work roll rotating shaft inserted therein and a grease supply part communicating with the grease supply pipe to supply grease to the roll edge part, by continuously supplying grease to the work roll edge part continuously. The work grease edge automatic grease supply device is characterized in that it prevents the breakage of the work roll edge grease film due to the heat generated during hot rolling, thereby preventing occurrence of poor rolling of the edge portion of the hot rolled product. It is about.

In general, when rolling a metal strip such as steel sheet with a rolling mill, rolling oil is applied to reduce friction between the rolling roll of the rolling mill and the strip, to facilitate the processing of the strip, or to make the surface of the strip beautiful. Used.

Types of rolled oil used in hot rolling include fats and oils, fatty acids, synthetic esters, and the like, and natural fats and oils such as palm oil, tallow oil, rapeseed oil, castor oil, and the like are used. In the hot rolling of steel, the temperature of the plate is 1250 ~ 800 ℃ and the surface temperature of the roll is 400 ~ 500 ℃. Therefore, a large amount of industrial water is used to cool the rolls.

1.Hard adhesion that does not fall off with roll coolant

2. Excellent lubrication performance in high temperature oxidation and heat resistance

3.Anti-emulsification, easy to separate from cooling water after rolling

Such characteristics may be mentioned. At present, according to the above conditions, a kind of vegetable rolling oil having high viscosity and good adhesion is preferred.

In application of rolling oil, the suitability of the supply method influences an effect. Commonly used rolling oil supply method is to mix coolant and grease directly to work roll or spray to back-up roll, then transfer to work roll and finally roll bite Although water injection is a water injection method in which grease is supplied, a conveyor belt method, a press method, and a gas atomizing method are also used.

In recent years, materials which are difficult to roll, such as high tensile strength steel sheets, have increased in hot rolling operations. In materials that are difficult to hot-roll, there is a tendency for rolling to become unstable due to high load, and remarkable sticking occurs between the steel sheet and the work roll depending on the components of the rolling material, and it is difficult to obtain a steel sheet having good surface properties. Therefore, in hot rolling, in order to lubricate the contact part between steel materials and a work roll, supplying the rolling oil to the roll bite of a work roll is performed.

Referring to Figure 1 (a), a schematic diagram of a rolling oil supply apparatus according to the prior art is shown, and referring to Figure 1 (b), a schematic diagram of a rolling oil injection nozzle of the supply apparatus is shown.

The rolled oil supply device according to the prior art is operated as follows.

As the cast steel 140 is rolled between the work rolls 110 and moves in the cast steel moving direction 145, the rolling oil is sprayed from the work roll rolling oil spray nozzle 130 and the cast steel roll spray nozzle 135, respectively. In more detail, as can be seen in Figure 1 (b), the rolling oil injected into the supply port 132 of the rolling oil injection nozzle is the work roll (through the discharge port 131 of the rolling oil injection nozzle arranged at regular intervals ( 110) and evenly sprayed on the surface of the cast steel 140, in some cases rolling oil is also sprayed on the backup roll 120.

In general, when the rolling oil is sprayed, when an excessive amount of the rolling oil is sprayed, a pattern or unevenness of the rolling oil is generated, and even when an appropriate amount of the rolling oil is sprayed, the rolling oil reaches the edge of the roll (approximately 40 mm from both ends of the roll). There is a problem that can not. Therefore, the edge portion of the roll increases the frictional force due to the lack of rolling oil, so that the defect of the cast steel such as the edge portion of the cast steel, the thickness becomes irregular, or the tear occurs.

In addition, the edge portion of the work roll may be rubbed with the slab while the portion where the slab is plated is rubbed with the slab in the plate direction of the slab, but the upper and lower work rolls may be rubbed with the portion where the slab is not plated.

Therefore, since the edge of the work roll requires a separate lubrication means, grease having higher viscosity and better lubrication performance is used than general rolling oil, and in general, manual work is applied to grease the work roll edge surface. . As such, a grease film is always formed on the work roll heated to or above the recrystallization temperature of iron to reduce frictional force with the hot rolled material, thereby preventing work roll wear and improving product quality.

However, since grease was applied by hand, the labor strength was increased, and grease was not supplied evenly. The work roll edge part was easily broken due to the high temperature (about 450 ° C) condition and the material was continuously rolled. There was a problem of causing defects on the surface and furthermore rolling damage.

The present invention is to overcome the above-mentioned conventional problems, an object of the present invention by continuously supplying grease to the work roll edge part to prevent the oil film breakage phenomenon of the work roll edge part grease due to heat generated during hot rolling, It is to prevent the occurrence of the poor rolling of the edge part of hot rolled products.

In order to achieve the above object, the present invention provides a grease supply pipe (211) for injecting grease; A grease supply passage 212 formed therein so that the grease supply pipe 211 passes, and a rotary part 210 into which the rotation shaft 222 of the work roll 200 is inserted and supported; And a work roll 200 having a grease supply unit 250 in communication with the grease supply pipe 211 to supply grease to the roll edge portion 245, wherein the grease supply unit 250 is the rotary unit 210. A grease retention groove 220 recessed in a circular shape about the roll rotating shaft 222 on both end surfaces 221 of the work roll so as to communicate with the grease supply passage 212; A work roll grease supply passage 230 in communication with the grease retention groove 220 and formed at least one inside of the outer circumferential surface in a longitudinal direction at both end faces 221 of the work roll; A grease supply recess 240 recessed along the edge portion 245 of the outer circumferential surface of the work roll 200; The work roll supply passage 230 and the grease supply groove 240 is characterized in that it is composed of a discharge port 241 drilled to communicate.

Hereinafter, the present invention will be described in more detail.

2, there is shown a perspective view of a work roll edge grease supply apparatus according to the present invention.

As shown, the grease supply pipe 211 is piped along the grease supply passage 212 bent so that the grease supply pipe passes through the rotary part 210, or the grease supply pipe is bent inside the rotary part without passing inside. It may also be welded to the inlet of the perforated grease supply passage 212.

One end of the grease supply passage 212 of the rotary part 210 is formed in a direction in contact with both end surfaces 221 of the work roll 200 and communicate with the grease retention groove 220 of the grease supply unit 250. Be sure to

The grease supply unit 250 includes a grease retention groove 220, a work roll grease supply passage 230, a grease supply recess 240, and a discharge port 241, and the detailed configuration thereof is as follows.

The grease retention groove 220 is recessed in a circular shape on both ends of the work roll about the rotation shaft 222 of the work roll. The cross section of the recessed grease retention groove 220 may have various shapes such as semicircular, rectangular, and trapezoidal. The grease retention groove 220 always communicates with the grease supply pipe 211 even when the work roll 220 rotates. At least one work roll grease supply passage 230 is formed in the grease retention groove 220 in the length direction of the work roll.

The work roll grease supply passage 230 communicates with the grease retention grooves 220 recessed on both ends of the work roll, and is formed at least one of the work roll grease supply passages 230 in the longitudinal direction of the work roll outer circumferential surface. The grease supply passage 230 communicates with the grease supply recess 240 through the discharge port 241, and is formed to correspond to the length of the edge portion 245 of the outer circumferential surface of the work roll on which the grease supply recess is formed, and the edge portion 245 is provided. The length of is from 40 mm to 50 mm in the longitudinal direction of the work roll 200 from the work roll both end surfaces 221.

The grease supply recess 240 is recessed into the work roll edge 245 in a spiral or simple annular shape.

3, there is shown a cross-sectional view of a work roll edge grease supply apparatus according to the present invention.

The grease supply pipe 211 is closely coupled to communicate with the grease retention groove 220 recessed on both end surfaces 221 of the work roll. The work roll rotating shaft 222 is inserted into the rotary plate 201 in which the bearing 202 is inserted and rotated, and the plurality of balls 203 are inserted into the rotary part 210 and the contact portion of the rotary plate 201 so as to be rotatable. After the rotary plate 201 and the work roll rotation shaft 222 are inserted and coupled to the work roll rotation shaft fixing groove 223 protruding to the front surface of the rotary plate 201, a fixing key 204 for preventing separation is fixed screw 205. Is fixed by.

The work roll edge grease supply apparatus according to the present invention includes a grease supply pipe (211) for injecting grease; A grease supply passage 212 formed therein so that the grease supply pipe 211 passes, and a rotary part 210 into which the rotation shaft 222 of the work roll 200 is inserted and supported; And a work roll 200 having a grease supply unit 250 in communication with the grease supply pipe 211 to supply grease to the roll edge portion 245, wherein the grease supply unit 250 is the rotary unit ( A grease retention groove 220 recessed in a circular shape about the roll rotating shaft 222 on the work roll both end surfaces 221 so as to communicate with the grease supply passage 212 of the 210; A work roll grease supply passage 230 in communication with the grease retention groove 220 and formed at least one inside of the outer circumferential surface in a longitudinal direction at both end faces 221 of the work roll; A grease supply recess 240 recessed along the edge portion 245 of the outer circumferential surface of the work roll 200; The work roll supply passage 230 and the grease supply groove 240 is formed of a discharge hole 241 is bored to communicate.

By the above configuration, the work roll edge grease supply apparatus according to the present invention operates as follows.

As the work roll combined with the rotary plate rotates and the cast steel is passed between the work rolls 200, a predetermined amount of grease is continuously and automatically supplied through the grease supply pipe 211. At this time, the grease supply method can be both a direct method and a circulation method.

The direct method supplies grease through the grease supply pipe 211 and the used grease is discharged to a separate waste liquid treatment facility. The circulation method freezes the grease stored in the storage tank or pressurizes it using a pump. As a feeding method, the grease is introduced through a grease supply pipe, and the used grease is purified, recovered and then returned to a storage tank.

Even if the grease supply pipe 211 is piped along the grease supply passage 212 of the rotary part 210 or the grease supply pipe is welded to the inlet of the grease supply passage 212 formed in a bent shape inside the rotary part 210. The bent portions of the grease supply passage 212 and the grease supply pipe 211 are processed into curves so as not to disturb the flow of grease.

Grease that is continuously and automatically supplied through the grease supply pipe 211 is in the grease retention groove 220 is tightly coupled to communicate with the outlet of the grease supply pipe 211 or the grease supply passage 212 while the work roll 200 rotates. Is filled.

Since the rotary part is always fixed without rotation, the outlet of the grease supply pipe 211 is always fixed at the same position. At this time, the grease retaining grooves 220 formed on both end surfaces 221 of the work roll have the work roll rotating shaft 222 so as to always communicate with the outlet of the grease supply pipe 211 or the grease supply passage 212 as the work roll rotates. It is recessed into a circle centered on). And the cross-section of the grease retention groove 220 can be any, regardless of the shape of the semi-circular, trapezoidal, triangular, etc. as long as it does not interfere with the flow of grease.

The grease filled in the grease retention groove 220 is again supplied along the work roll grease supply passage 230, and the grease filled in the work roll grease supply passage 230 is returned to the grease supply recess 240 through the discharge port 241. Discharged.

When the grease supply recess 240 is recessed in a spiral manner, the grease discharged into the grease supply recess 240 is transported along the spiral of the grease supply recess 240 while the work roll 200 rotates, and then moves in the length direction of the work roll. While being spread evenly applied to the surface of the edge portion 245.

When the grease supply recess 240 is recessed in a simple annular shape, the grease discharged into the grease supply recess 240 is diffused and applied to the outer circumferential surface of the roll regardless of the length of the work roll while the work roll 200 rotates. .

Since the temperature of the work roll reaches 450 ° C., the grease supplied to the edge portion is naturally melted and diffusely applied to the surface of the work roll edge portion due to the surface tension of the grease itself to form a grease oil film.

In addition, the grease supply is constantly and consistently maintained, thus maintaining a constant grease film on the surface of the work roll during hot rolling.

After forming an oil film on the surface of the work roll, excess grease can be recovered and disposed of, or purified and then returned to the storage tank for reuse.

As described above, the work roll edge grease supply apparatus according to the present invention prevents the breakage of the grease film of the work roll edge portion due to heat generated during hot rolling by continuously supplying grease to the work roll edge portion continuously even during normal operation. It prevents the edge rolling failure of the hot rolled product generated at the work roll edge part.

Claims (4)

A grease supply pipe 211 for injecting grease; A grease supply passage 212 formed therein so that the grease supply pipe 211 passes, and a rotary part 210 into which the rotation shaft 222 of the work roll 200 is inserted and supported; Roll rotation shaft 222 is provided on both end surfaces 221 of the work roll so as to be in communication with the grease supply pipe 211 so as to communicate with the grease supply passage 212 of the rotary part 210 so that grease is supplied to the roll edge portion 245. At least one grease retaining groove 220 recessed in a circular shape and at least one work roll grease supply passage communicating with the grease retaining groove 220 and formed in the outer circumferential surface in the longitudinal direction at both ends of the work roll 221 ( 230, the grease supply recess 240 recessed along the edge 245 of the outer circumferential surface of the work roll 200, and the work roll supply passage 230 and the grease supply recess 240 communicate with each other. And a work roll (200) having a grease supply section (250) having a discharge port (241) . delete The method of claim 1 , The length of the edge portion 245 is the automatic roll supply of the work roll edge portion, characterized in that up to 40mm in the longitudinal direction from both ends of the work roll (221). The method of claim 1 , The grease supply groove 240 of the work roll 200 is a work roll edge automatic grease supply device, characterized in that the recessed process in a spiral or annular along the outer peripheral surface of the work roll.

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