JP2001276921A - Sleeve guide for guiding steel material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sleeve guide having sufficient crack resistance to protect cracks caused by shock, and scatter caused by cracks and further, having a steady structure thereby preventing damage or break away of the structural components caused by shock and vibration even when steel material to be introduced is entered into the sleeve guide. SOLUTION: Using an external cylinder 41 which has an internal diameter smaller than the external diameter of an internal cylinder 42, the internal cylinder is inserted with force into the external cylinder partially notching the body pat in the axial direction of the external cylinder, or the external cylinder is enlarged by thermal expansion by heating and fitted into the internal cylinder and fixed by cooling. The material of the internal cylinder is selected from among ceramics, carbon, carbon composite and ceramics composite, which has solid lubricity hardly damage products owing to its high wear resistance, and the material of the external cylinder is a metal which has good crack resistance with standing shock.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sleeve guide for steel material guide, which is used in a rolling line for steel material and the like, and has improved fracture resistance.

[0002]

2. Description of the Related Art A sleeve guide used for introducing high-temperature / heavy-weight materials in a process of cooling and forming in a wire rod, a steel bar rolling mill, or the like has a shock when the introduced steel material or the like enters. Because of contact, high breakage resistance is required.

FIG. 5 shows a processing flow in a wire rod rolling factory. The wire 51 is processed into a coil 55 by a laying head 54 through a rolling mill 52 and a water cooling zone 53.
It is conveyed by the stealmore conveyor 56 and shipped. The steel material guide sleeve guide 57 shown in FIGS. 6A and 6B is used for the steel material guide in the water cooling zone 53, the laying head 54, and the like. Conventionally, metal sleeve guides made of heat-resistant steel, iron-based alloys, etc. have been used, but metal sleeve guides have high splitting resistance, but have low abrasion resistance. An edge is formed on the sleeve guide itself, and the edge
There is a problem that maintenance such as replacement of the sleeve guide must be performed frequently because the steel material to be introduced is damaged.

As a material other than metal, a sleeve guide made of carbon is used. The sleeve guide made of carbon is inferior to the metal guide in terms of breakage resistance and abrasion resistance, but is excellent in solid lubrication, so that it does not easily damage steel materials to be introduced. However, there is a problem that the frequency of maintenance due to breakage and wear is much higher than that of a metal sleeve guide.

In recent years, there has been proposed a ceramic sleeve guide in which a portion that comes into contact with a steel material or the like to be introduced is formed of a ceramic such as silicon nitride.
The wear resistance of a sleeve guide made of ceramic such as silicon nitride is superior to that of a metal or carbon sleeve guide, but the breakage resistance is equivalent to that of a carbon sleeve guide and inferior to that of a metal sleeve guide. However, there is a problem in that, depending on the impact at the time of entry, the steel sheet is divided into small pieces due to breakage and scattered, which causes a stoppage of the process of the steel rolling line.

According to Japanese Utility Model Application Laid-Open No. 5-18710, a metal material transfer guide having a structure of a cast iron protection member and a ceramic guide is proposed. The guide is designed to reduce the frequency of wear and prevent damage to products such as steel, but only the ceramic guide and the cast iron protective material are fixed by the inlet base and the outlet stopper. , Ceramic guides are not protected in close contact with the cast iron protective material, and are easily damaged by shock and vibration when steel materials are introduced, and cannot be used stably for a long time. If this occurs, there is a problem that the protective material cannot support the guide body and scatters.

Japanese Patent No. 2527765 proposes an improvement in a wire rod laying device, in which a wire rod guide having a structure of a metal long outer pipe and a plurality of single carbon lubrication pipes is shown. I have. However, the plurality of single carbon lubrication pipes and the long outer pipe are fixed by the stopper on the outlet side, and the impact and vibration at the time of introduction of steel materials or the collision of the single carbon lubrication pipes at this time. There is a problem that it is damaged and scattered.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a method in which a steel material or the like to be introduced is subjected to an impact when entering. Sufficient breakage resistance to prevent breakage and scattering due to breakage, or even if broken, does not scatter, so damage to the steel rolling line can be suppressed and the structure is stable An object of the present invention is to provide a sleeve guide capable of stably guiding a steel material or the like for a long period of time without being damaged by impact or vibration when a steel material or the like to be introduced enters, and without coming off of a component part.

[0009]

Means for Solving the Problems According to the present invention, an inner cylindrical portion and an outer cylindrical portion made of a metal material, which are used in a steel rolling line, are formed on the outer circumferential portion of the inner cylindrical portion. A fitted sleeve guide having a double structure, using an outer peripheral cylinder having an inner diameter smaller than the outer diameter of the inner cylinder, partially cutting off the body part in the axial direction of the outer cylinder, A sleeve guide for steel material guide is provided, wherein the inner cylindrical body is pressed into the outer cylindrical body and fixed.

Further, according to the present invention, a double structure used for a steel material rolling line, in which an inner cylindrical member and an outer cylindrical member made of a metal material are fitted to the outer peripheral portion of the inner cylindrical member. A sleeve guide for a steel material guide, wherein an outer peripheral cylindrical body is fitted to an inner cylindrical cylindrical body in a state where the dimensions are expanded by heating and thermal expansion, and the outer cylindrical body is fixed by cooling. A guide will be provided.

Further, according to the present invention, a double structure in which an outer cylindrical member made of a metal material is fitted to an outer peripheral portion of an inner cylindrical member and an inner cylindrical member used in a steel material rolling line. The sleeve guide of the above, wherein one end of the outer peripheral cylinder and one end of the inner cylinder cylindrical are tapered portions having a diameter smaller than the cross section of each straight body part, and the outer peripheral cylinder is an inner cylinder cylindrical. There is provided a sleeve guide for a steel material guide, which is fixed to a body.

In the present invention, the material of the inner cylindrical body is preferably made of any one of a ceramic material, a carbon material, a carbon composite material, and a ceramic composite material. Silicon nitride,
It is preferable that any one of sialon, zirconia, silicon carbide, and alumina be the main phase, and the carbon material be graphite or a C / C composite composed of matrixed carbon fibers and carbon powder. preferable. Also, as a carbon composite material,
It is preferable to use a SiC-based composite material or a Si-SiC-based composite material. Further, the ceramic composite material is made of a material obtained by mixing and sintering two or more of silicon nitride, sialon, zirconia, silicon carbide, alumina, a SiC-based composite material, and a Si-SiC-based composite material. Is preferred.

In the present invention, the material of the outer peripheral cylindrical body is preferably made of heat-resistant steel such as stainless steel.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a steel material guide sleeve guide is made of a ceramic material, a carbon material,
An inner cylinder made of a carbon composite material or a ceramic composite material, and an outer cylinder made of a metal material such as stainless steel was fitted to the outer periphery of the inner cylinder. As means for fixing the inner cylindrical body and the outer cylindrical body, that is, as a method of forming a double structure, utilizing the spring force due to the elasticity of the outer peripheral material, and using the temperature of the outer peripheral material Utilizing the expansion and contraction phenomenon, and narrowing down the circular end face on the opposite side to the direction in which the steel material or the like intrudes is adopted. As a result, sufficient breakage resistance is imparted to the sleeve guide for the steel material guide, and the breakage due to the impact when the introduced steel material or the like enters and the scattering due to the breakage occur within a short period of use. To prevent damage to the rolling line of steel material because it does not scatter even if it breaks, and is damaged by shock and vibration when introduced steel material etc. with a stable structure It is possible to guide a steel material or the like stably for a long period of time without any dislocation of component parts.

[0015] That is, a metal material which is strong against impact and has excellent breakage resistance is used on the outside of the double structure in order to compensate for the low wear resistance of the metal material and the property of easily damaging steel and the like. , The part that comes into contact with steel etc. inside the double structure,
Uses a ceramic material, carbon material, carbon composite material, or ceramic composite material that is inferior in wear resistance and solid lubricity, but uses spring force due to the elasticity of the outer peripheral member and uses the outer member The above properties can be imparted to the steel material guide sleeve guide by using the expansion and contraction phenomenon due to the temperature of the steel and fixing the double structure by narrowing the circular end face opposite to the direction in which the steel material etc. enters. .

In the present invention, the use and type of the sleeve guide are not particularly limited, and may be any as long as they are used for introducing a steel material or the like.

FIG. 5 shows a processing flow in a wire rod rolling factory using the above-described sleeve guide for steel material guide. In addition to the sleeve guide used to introduce the laying head 54, the sleeve guide is used to introduce the water cooling zone 53 as well. These sleeve guides, a ceramic material, a carbon material, a carbon composite material, or an inner cylindrical portion made of a ceramic composite material, and an outer peripheral portion made of a metal material fitted to the outer peripheral portion of the cylindrical body,
It will be composed of a double structure.

FIG. 1 is an explanatory view showing one embodiment of a steel material guide sleeve guide having a structure in which a part of a body in the axial direction of an outer peripheral cylindrical body is partially cut out of a steel material guide sleeve guide according to the present invention. (A) is a cross-sectional view of the inner cylindrical body alone, (b) is a cross-sectional view of the outer cylindrical body alone,
(C) is an AA cross-sectional view of (b), (d) is an axial cross-sectional view in a state where the inner cylindrical portion and the outer peripheral portion are fitted, and (e) is a BB cross-sectional view of (d). It is. The steel material guide sleeve guide 16 has a structure in which the outer peripheral cylindrical body 11 is fitted to the outside of the inner cylindrical cylindrical body 12.

In the steel material guide sleeve guide 16, the outer peripheral cylindrical body 11 made of a material having excellent splitting resistance is used.
And an inner cylindrical portion 12 made of a material having excellent solid lubricity and abrasion properties. As a means for fitting the outer peripheral portion to the inner cylindrical portion, a spring force due to the elasticity of the outer peripheral material is used. I use. That is, when the inner diameter of the outer cylinder 11 is smaller than the outer diameter of the inner cylinder 12, the body of the outer cylinder 11 in the axial direction is cut out, and the notch 13 is expanded. The inner diameter of the outer cylinder 11 is larger than the outer diameter of the inner cylinder 12, and the machine is inserted into the outer cylinder. When the expansion of the cutout portion 13 is stopped, the outer cylindrical member 11 comes into close contact with the inner cylindrical member 12 due to the elastic force of the outer member. The inner diameter of the outer peripheral cylinder 11 is
It is set each time depending on the conditions such as the material and thickness of the device.

FIG. 2 is an explanatory view showing an embodiment of a steel material guide sleeve guide which is fixed by shrink-fitting the outer peripheral cylindrical body to the inner cylindrical portion cylindrical member in the steel material guide sleeve guide according to the present invention. (A) is a cross-sectional view of the inner cylindrical body alone, (b) is a cross-sectional view of the outer cylindrical body alone, (c) is an AA cross-sectional view of (b), and (d) is an inner cylindrical part. A sectional view in the axial direction in a state where the outer peripheral portion is fitted, FIG.
It is B sectional drawing. This steel material guide sleeve guide 26
Has a structure in which an outer peripheral cylindrical body 21 is fitted to the outside of an inner cylindrical cylindrical body 22.

In the steel material guide sleeve guide 26, the outer peripheral cylindrical body 21 made of a material excellent in splitting resistance is used.
And an inner cylindrical portion 22 made of a material having excellent solid lubricity and abrasion properties. As a means for fitting the outer peripheral portion to the inner cylindrical portion, expansion and contraction phenomena caused by the temperature of the outer peripheral material are used. I use. In other words, the inner diameter of the outer cylinder 21 is slightly smaller than the outer diameter of the inner cylinder 22, and the outer cylinder 21 is heated and expanded in size by thermal expansion. The outer peripheral cylindrical body 21 is brought into close contact with the inner cylindrical cylindrical body 22 by being contracted and fastened by being fitted to and cooled by the body 22. The inner diameter of the outer cylindrical body 21 is set each time according to conditions such as the material and thickness of the outer cylindrical body 21 and the material of the inner cylindrical body 22.

FIG. 3 shows that the outer peripheral cylinder and the inner cylinder cylinder of the steel material guide sleeve guide according to the present invention are:
FIG. 7A is an explanatory view showing one embodiment of a sleeve guide for steel material guide having a structure narrowed by a circular end face on a side opposite to a direction in which steel material and the like enters, (a) is a cross-sectional view of an inner cylinder portion cylindrical body alone, (B) is a cross-sectional view of the outer cylindrical body alone, (c) is an AA cross-sectional view of (b), (d) is an axial cross-sectional view in a state where the inner cylindrical portion and the outer peripheral portion are fitted, (E) is B- of (d).
It is B sectional drawing. This steel material guide sleeve guide 36
Has a structure in which an outer peripheral cylindrical body 31 is fitted to the outside of an inner cylindrical cylindrical body 32.

In the steel material guide sleeve guide 36, the outer peripheral cylindrical body 31 made of a material having excellent splitting resistance is used.
And an inner cylindrical portion 32 made of a material having excellent solid lubricity and abrasion properties. As means for fitting the outer peripheral portion to the inner cylindrical portion, the inner cylindrical portion 32 and the outer cylindrical portion are used. The body 31 narrows the circular end face on the opposite side to the direction in which the steel material or the like enters. Inner cylinder cylindrical body 32
The inner diameter of the outer peripheral cylindrical body 31 is larger than the outer diameter of
It is assumed to be as large as about 0.05 mm.
Is inserted into the outer peripheral cylindrical body 31, but the circular end face on the opposite side to the direction in which the steel material or the like enters is made smaller in diameter than the straight body partial cross section, that is, the diameter is constant toward the end face in the cross section viewed from the radial direction. The outer peripheral cylindrical body 31 is narrowed down by having a tapered portion that is continuously reduced at a ratio of
Is in close contact with the inner cylindrical body 32.

FIG. 4 shows three means shown in FIGS. 1 to 3 as means for fitting the outer cylindrical body to the inner cylindrical body according to the present invention, that is, the elasticity of the outer circumferential material. Means for utilizing the spring force of the outer member, means for utilizing the expansion and contraction phenomenon caused by the temperature of the outer peripheral member, means for narrowing the circular end face opposite to the direction in which the steel material or the like penetrates. 46 is an explanatory view showing the embodiment of FIG. 46, wherein (a) is a cross-sectional view of an inner cylindrical body single body, (b) is a cross-sectional view of an outer circumferential cylindrical body alone, and (c) is an AA cross-sectional view of (b). (D) is a sectional view in the axial direction in a state in which the inner cylindrical portion and the outer peripheral portion are fitted, and (e) is a sectional view taken along the line BB of (d).
The steel material guide sleeve guide 46 has a structure in which the outer peripheral cylindrical body 41 is fitted to the outside of the inner cylindrical cylindrical body 42. In addition, in the present invention, the means for fitting the outer peripheral cylindrical body to the inner cylindrical part cylindrical body may be adopted by combining any two of the three means.

In the steel material guide sleeve guides 16, 26, 36 and 46 shown in FIGS.
Steel products enter from 4, 34 and 44. At this time, the steel material comes into contact with the inner cylindrical body 12, 22, 32, 42. Therefore, the material of the inner cylinder portion cylindrical body is required to have a high abrasion resistance and a solid lubricity that does not easily damage the product,
A ceramic material, a carbon material, a carbon composite material, a ceramic composite material, or the like is selected.

In the steel material guide sleeve guides 16, 26, 36 and 46 shown in FIGS.
When the steel product enters from 4, 34 and 44, the sleeve guide vibrates and small collisions are repeated because the sleeve guide is not completely fixed to the rolling line equipment body. Accordingly, the material of the outer peripheral cylindrical bodies 11, 21, 31, 41 is
It is necessary to have high impact resistance, and a metal material or the like is selected.

In the present invention, as the ceramic material used for the inner cylindrical body, silicon nitride, sialon,
It is preferable that the material be any one of zirconia, silicon carbide, and alumina as a main phase.

In the present invention, the carbon material used for the inner cylindrical body is preferably graphite or a C / C composite material composed of matrixed carbon fibers and carbon powder.

In the present invention, the SiC-based composite material used for the inner cylindrical body is composed of silicon carbide, carbon fiber, and a carbon component other than carbon fiber, and is formed around the skeleton and the skeleton. It is preferably a SiC-C / C composite composite material having a structure composed of a matrix.

In the present invention, the Si—SiC-based composite material used for the inner cylindrical body is a material having a configuration in which a basic skeleton composed of a C / C composite is surrounded by a matrix composed of a Si—SiC-based material. Preferably, there is.

In the present invention, as the ceramic composite material used for the inner cylindrical body, any one of silicon nitride, sialon, zirconia, silicon carbide, alumina, a SiC-based composite material, and a Si—SiC-based composite material It is preferable that the material be a material obtained by sintering a mixture of two or more kinds.

[0032]

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

(Example 1) Silicon nitride was used as a member of a cylindrical body of an inner cylindrical portion constituting a sleeve guide for a dual structure steel material guide. Also, stainless steel was used as a member of the outer peripheral cylindrical body. In the wire rod mill shown in FIG. 5, an outer diameter of 43 mm and an inner diameter of 25 mm were formed by fitting a silicon nitride tube inside a stainless steel tube processed from these materials.
A set of sleeve guides (15 pieces) for a steel material guide having a length of 43 mm and a length of 43 mm was attached to the entrance side of the laying head 54. As shown in FIGS. 7 (a) and 7 (b), the mounting method was such that 15 steel material guide sleeve guides were inserted in series into a metal pipe, and stoppers were welded and fixed to both ends of the metal pipe.
The wire 51 was introduced into the laying head 54 via the steel material guide sleeve guide, and the total passing weight of the wire 51 and the breakage of the sleeve guide were observed. The same observation was performed five times with five types of sleeve guides manufactured under the same conditions. Table 1 shows the results.

A silicon nitride cylinder was manufactured as follows. To a silicon nitride raw material, a predetermined amount of a binder is added, mixed, dried and granulated, and the obtained granulated raw material is filled in a molding die composed of a rubber mold, molded by an isostatic press, and has an outer diameter of 50 mm. A molded article having an inner diameter of 30 mm and a length of 55 mm was produced. Next, the formed body was processed into a predetermined shape by an NC lathe, calcined in the air at 400 ° C. to remove the binder, and then fired at 1700 ° C. in a nitrogen atmosphere under normal pressure for 1 hour to obtain a sintered body. Next, the obtained sintered body was processed using a metal bond diamond grindstone to have an outer diameter of 39 mm and an inner diameter of 25 m.
m, a length of 43 mm, and an outer diameter edge portion on a side opposite to the direction in which the steel material enters was tapered and finished by 3 mm in the axial direction by 15 ° to produce a silicon nitride inner cylinder cylindrical body. On the other hand, a stainless steel cylinder is a stainless steel tube (outer diameter 42 mm, inner diameter 38 mm, length 43 mm)
Was manufactured by narrowing down one side of the inner diameter side so as to have a taper of 3 mm in the axial direction and a taper of 15 °, and further performing a notch processing with a width of 2 mm in the axial direction.

(Embodiment 2) As the member of the inner cylindrical portion constituting the sleeve guide for the dual structure steel material guide, C / C
Si impregnated with silicon and silicon carbide and fired
-A SiC-based composite material was used. A steel material guide sleeve guide similar to that of Example 1 was prepared except for the member of the inner cylindrical portion cylindrical body, and the state of breakage of the sleeve guide was observed under the same conditions as in Example 1. Table 1 shows the results.

(Comparative Example 1) A sleeve guide for steel guides having an outer diameter of 43 mm, an inner diameter of 25 mm, and a length of 43 mm was prepared by using silicon nitride as a member of the steel guide sleeve guide having no double structure. Under the same conditions as in No. 1, the state of breakage of the sleeve guide was observed. Table 1 shows the results.
Shown in

(Comparative Example 2) As a member of a sleeve guide for a steel material guide having no double structure, a C / C composite impregnated with silicon and silicon carbide and fired was used. Inside diameter 25mm, length 43
Example 1 A sleeve guide for a steel material guide of 1 mm was manufactured, and Example 1 was manufactured.
Under the same conditions as in the above, the state of breakage of the sleeve guide was observed. Table 1 shows the results.

(Consideration) In the case of using the sleeve guide for the steel material guide of Comparative Example 1 which was not double-structured and used silicon nitride, the sleeve guide was immediately broken and scattered, and the line was stopped. At this time, the total wire passing weight is 2000
Ｋｇ3000 kg. In addition, even when the sleeve guide for the steel material guide of Comparative Example 2 having a double structure and using the Si-SiC-based composite material was used, the sleeve guide was broken and scattered early, leading to line stop. At this time, the total wire passing weight was 3000 to 4000 kg. On the other hand, when a sleeve guide for a double structural steel material having a stainless steel tube arranged on the outer peripheral portion is used, in Example 1 using silicon nitride as a member of the inner cylindrical portion cylinder,
No breakage of the sleeve guide occurred, and no cracks were observed. The total wire passing weight at this time was 80000
kg. Moreover, Si-S is used as a member of the inner cylinder.
In Example 2 using the iC-based composite material, when the total wire passing weight was 50,000 kg, the breakage of the sleeve guide was confirmed, but it was not scattered, and the line did not stop.

[0039]

[Table 1]

[0040]

As described above, according to the present invention, it has excellent breakage resistance, does not crack even when used for a long time as an inlet for steel materials, and has a stable structure. There is no breakage due to shock and vibration when the steel material or the like enters, and the component parts do not come off, and the life of the steel material guide sleeve guide can be extended, that is, the maintenance frequency of the wire rod and the bar steel rolling line is reduced. Therefore, the manufacturing cost of products such as steel materials can be reduced. Further, even if the inner cylindrical portion of the steel material guide sleeve guide is broken, the outer cylindrical portion can prevent the inner cylindrical portion from being scattered, so that damage to the rolling line of the steel material can be suppressed. Can contribute to the reduction of manufacturing costs.

[Brief description of the drawings]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an embodiment of a sleeve guide for a steel material guide of the present invention, in which (a) is a cross-sectional view of an inner cylinder body alone, (b) is a cross-sectional view of an outer cylinder body alone, FIG. 3C is a cross-sectional view taken along the line AA of FIG. 4B, FIG. 4D is a cross-sectional view in a state where the inner cylindrical portion and the outer peripheral portion are fitted, and FIG. 4E is a cross-sectional view taken along the line BB of FIG.

FIG. 2 is an explanatory view showing another embodiment of a sleeve guide for a steel material guide according to the present invention, wherein (a) is a cross-sectional view of an inner cylinder body alone, (b) is a cross-sectional view of an outer cylinder body alone, (C) is an AA cross-sectional view of (b), (d) is a cross-sectional view in a state where the inner cylindrical portion and the outer peripheral portion are fitted, and (e) is a BB cross-sectional view of (d).

3A and 3B are explanatory views showing another embodiment of the sleeve guide for a steel material guide of the present invention, wherein FIG. 3A is a cross-sectional view of an inner cylindrical body alone, FIG. (C) is an AA cross-sectional view of (b), (d) is a cross-sectional view in a state where the inner cylindrical portion and the outer peripheral portion are fitted, and (e) is a BB cross-sectional view of (d).

FIGS. 4A and 4B are explanatory views showing still another embodiment of the sleeve guide for steel material guide of the present invention, wherein FIG. 4A is a cross-sectional view of an inner cylindrical body alone, and FIG. ,
(C) is a cross-sectional view taken along the line AA of (b), (d) is a cross-sectional view in a state where the inner cylinder portion and the outer peripheral portion are fitted, and (e) is a BB line of (d).
It is sectional drawing.

FIG. 5 is a flow example of a general wire rod rolling factory using a sleeve guide for steel material guide.

FIG. 6A is a front view of a steel material guide sleeve guide. (B) is a side view of the sleeve guide for steel material guides.

FIG. 7 is an explanatory view showing one embodiment of a sleeve guide for steel material guide applied to a laying head, and FIG. 7 (a) is an overall side view. (B) is a partial enlarged sectional view of the CC section of (a).

[Explanation of symbols]

11: outer peripheral cylinder, 12: inner cylinder cylinder, 13: notch, 14: steel material introduction part, 16: steel material guide sleeve guide, 21: outer peripheral cylinder, 22: inner cylinder cylinder, 2
4 ... steel material introduction part, 26 ... sleeve guide for steel material guide,
31: outer peripheral cylindrical body, 32: inner cylindrical cylindrical body, 34: steel material introduction part, 35: tapered part, 36: steel material guide sleeve guide, 41: outer peripheral cylindrical body, 42: inner cylindrical cylindrical body,
43 ... notch, 44 ... steel material introduction part, 45 ... taper part, 46 ... steel material guide sleeve guide, 51 ... wire rod,
52: rolling mill, 53: water cooling zone, 54: laying head,
55: coil material, 56: stellmore conveyor, 57: steel material guide sleeve guide, 58: steel material guide sleeve guide (applied to laying head).

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Nobumi Nishimura 3007 Nakajima character one letter, Shima, Himeji-shi, Hyogo F-term (reference) in Sanyo Special Steel Co., Ltd. 3F110 AA08 BA01 DA07 DB12

Claims (9)

[Claims] 1. A double-walled steel guide sleeve for use in a steel rolling line in which an inner cylinder and an outer cylinder made of a metal material are fitted to the outer periphery of the inner cylinder. A guide, wherein the outer cylinder having a smaller inner diameter than the outer diameter of the inner cylinder is partially cut out in an axial direction of the outer cylinder to form the inner cylinder; A sleeve guide for a steel material guide, wherein a body is pressed into the outer peripheral cylindrical body and fixed. 2. A double-walled steel guide sleeve for use in a steel rolling line, wherein an inner cylindrical body and an outer cylindrical body made of a metal material are fitted around the outer circumference of the inner cylindrical body. A sleeve for a steel material guide, wherein the outer peripheral cylindrical body is fitted to the inner cylindrical cylindrical body in a state where the dimensions are enlarged by heating and thermal expansion, and then fixed by cooling. guide. 3. A double-walled steel guide sleeve for use in a steel rolling line, in which an inner cylinder and an outer cylinder made of a metal material are fitted to the outer periphery of the inner cylinder. A guide, wherein one end of the outer peripheral cylindrical body and one end of the inner cylindrical part cylindrical body are tapered portions each having a diameter smaller than the cross section of each straight body part, and the outer peripheral cylindrical body is the inner cylinder. A sleeve guide for a steel material guide, which is fixed to a cylindrical body. 4. The material according to claim 1, wherein the material of the inner cylinder is made of any one of a ceramic material, a carbon material, a carbon composite material, and a ceramic composite material. Sleeve guide for steel material guide according to the paragraph. 5. The method according to claim 1, wherein the ceramic material is selected from the group consisting of silicon nitride, sialon, zirconia, silicon carbide, and alumina.
The sleeve guide for a steel material guide according to claim 4, wherein any one of the main phases is used as a main phase. 6. The carbon material according to claim 1, wherein said carbon material is graphite or C / C
The sleeve guide according to claim 4, wherein the sleeve guide is made of a C composite. 7. The sleeve guide according to claim 4, wherein the carbon composite material is made of a SiC-based composite material or a Si—SiC-based composite material. 8. The method according to claim 1, wherein the ceramic composite material is silicon nitride,
Sialon, zirconia, silicon carbide, alumina, SiC
The sleeve guide according to claim 4, wherein the sleeve guide is made of a material obtained by mixing and sintering two or more of a composite material and a Si-SiC composite material. 9. The material according to claim 1, wherein a material of the outer peripheral cylindrical body is made of stainless steel.
Sleeve guide for steel material guide according to the paragraph.