JPS6199557A - Production of composite roll - Google Patents

Abstract

PURPOSE:To join thoroughly the boundary parts of an inside layer material and outside layer material and to produce a roll having high quality by installing the inside layer material preheated in a non-oxidizing atmosphere to the inside surface side of a metallic mold and pouring a molten wear resistant material around the same under the pressure then cooling the material with water. CONSTITUTION:A dummy bar 1 is held to a dummy bar jig 2 and the inside layer material 6 is installed into the recess 8 thereof. The integral cylindrical metallic mold 3 is installed to a stand 14 around the material 6, then the mold 3 and the material 6 are preheated by a high-frequency heating coil 5; at the same time, gaseous Ar is blown from a gaseous Ar blowing nozzle. The preheating is stopped when the outside surface side of the material 6 attains the prescribed temp. and the molten metal is poured to the outside surface side of the material 6 to from the material 4. The molten metal is gradually pressurized by a plunger 10 of a vertical press upon completion of the pouring. The jig 2 is opened upon completion of the operation and at the same time, the bar 1 and the composite roll are pressurized by plungers 9, 10 so as to be lowered along guide rolls 11. High-pressure water is in ejected from cooling nozzles 13 of the cooling zone.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of the Invention] The present invention relates to a method for manufacturing hollow or solid composite rolls used as rolling roll materials, pinion gear materials, and the like.

[Conventional composite roll manufacturing method]

As a means of manufacturing a sigma roll, a conventional method has been proposed in which a bath is cast around a solid hollow pipe. (Japanese Patent Publication No. 44-4905 and Japanese Unexamined Patent Application Publication No. 48-1989)
See Publication No. 55956. In the conventional method of C, the core material of the pre-formed solid or hollow pipe ti roll (inner J-material)
Use it as a surface treatment agent and apply a surface treatment agent to the surface of this core material. After preventing acid 1, take a bath? This is a method of forming a brownish color on the outside of the composite roll.

[Disadvantages of the above conventional method]

In the above conventional method, the means for forming the outer layer of the composite roll is simply cast-in, and as a result, the close bonding between the inner layer material and the outer layer material, which are the core materials of the composite roll, is incomplete. are doing.

In addition, a surface treatment agent (gold) is applied to prevent browning surfaces from being exposed to acid.As a result, the surface treatment agent is present on the bonded surface, causing gas defects or inclusions.

[Object of the present invention]

Is the present invention a method for manufacturing composite rolls that eliminates all the drawbacks of the conventional methods described above? The purpose is to provide.

[Uninvented composition]

The present invention is basically a method similar to the above-mentioned conventional method, but employs a bath water pressure method after pouring, and does not apply surface treatment to the joint surface. All of the above-mentioned drawbacks of the conventional method are overcome by the method of bonding in an acid-free state. That is, the present invention involves manufacturing a composite roll that is molded on the inner surface of a cylindrical integral mold, and the inner layer material (hollow or solid material) t that has been preheated in a non-oxidizing atmosphere is placed on the inner surface of the mold.
- This is a method for manufacturing composite rolls, which is characterized in that the rolls are installed, a wear-resistant material is poured around them, pressure is applied, and the rolls are cooled with water.

〔Example〕

Below is an example of an uninvented composite roll manufacturing method with roll specifications.
The manufacturing conditions and manufacturing process will be explained in detail.

Roll specifications The specifications of the composite roll to be manufactured are as follows.

(11 Outer layer material 250r cast iron f ((
Support) Tray dimensions Inner diameter 560φ x Outer diameter 560φ x 5
00L (Outer layer outer diameter rs, 560φ (3) Inner layer material Carbon steel pipe (T-work S ST
KMl 5A) (4) Inner layer dimensions Outer diameter 295
φ×Inner diameter 25a5φ×Length 2000L (Inner layer outer diameter (29a5φ) is machined λ Manufacturing conditions Manufacturing conditions 1 are as follows.

(1) Inner layer material preheating temperature 600℃ (However, Ar seal was performed for t''s during preheating to prevent gold oxidation on the joint surface.) (2) Outer layer material loading temperature 1400℃ (3) Molten metal pressing force (No. 2 glaziers) 170 tons (stress 5 to gz4m”) (4) Bath dk pressurization time 20 seconds (5)
isna pressure (No, 11 Rashi-Y-) 140 tons (stress 2 hours/light 2) Manufacturing process The above specifications and manufacturing conditions VC1 is a process for manufacturing composite roll gold.Detailed explanation based on Figures 1 to 4. do. 1st
Fig. 2 is a diagram showing the pressurization of bath water in the composite roll feeding device, Fig. 2 is a diagram showing a fixed sprue placed directly above the composite roll inner layer material, and Fig. 5 is a detailed view of the seal cover. FIG. 4 is a diagram showing the bath water being poured.

(1) Outer diameter 295φ x inner diameter 25a5φ x length 200
Prepare 0L inner layer material 6 gold. However, the outer surface of the inner layer material 6 is machined (smooth finish) and thoroughly degreased with trichlorethylene.

(2) Hold the dummy bar 1 on the dummy bar jig 2,
The inner layer material 6 is entirely installed in the recess 8.

(3) Next, a circular integral mold 3 with an inner diameter of 560 φ x outer diameter of 560 φ x 2500 L is installed on the frame 14 around the inner layer material 6 . However, it is possible to perform μ cutting on the outer periphery of the mold 3, and the vertical drive mechanism (range 200 ntw+/m
in ~1000 +nP/min) High frequency induction with metal 7) O heating coil 5 is fully attached.

(4) Mold 5 and inner layer material 6 with high frequency Un heating coil 5
The inner layer material 6 is preheated, but the outer surface side of the inner layer material 6 (the bonding surface is even (
Preheat the upper and lower center parts 2 to 600°C. however,
At the start of preheating, a ceramic pipe pouring port 18 is installed directly above the inner layer material 6, and a seal cover 15'i consisting of an Ar gas blowing nozzle 16, a blowing nozzle 17, and an upper moat 20 is installed to prevent the outer surface of the inner layer material 6 from forming a slag. , Ar gas was continuously blown from the Ar gas blowing nozzle 16.

(5) When the outer surface of the inner layer material 6 reaches 600°C, the preheating is completely stopped. However, Ar gas is continuously blown in, the top of the seal cover 15 is removed, and a tundish 217 with a Nitrogen nozzle is inserted and installed in the top hole of the seal cover 15.

(6) After pouring the pre-melted molten 4 (25Cr cast iron) into the ladle 19, heat it to 1400°C via the tundish 21.
Molten metal is poured to form the outer layer material 4t on the outer surface of the entire inner layer material 6 of the bathroom. However, the pouring surface was attached to the inner surface of the mold 3 and was inspected using a friend sensor 22.

(7) After pouring, the tundish 21 and Ar seal cover 15 were completely removed, and immediately the molten metal was gradually increased to 710 pressure using a No. 2 10 VC vertical press with a total capacity of 500 tons. The pressurizing time in between is approximately 20 seconds. In addition, there is an air hole at 12,
No. 2 This is the air vent port when the plunger 10 is inserted.

(8) After the above operation is completed, the dummy bar holding jig 2 is fully opened, and at the same time, pressure is applied using No. 1 and 2 grangers 9 and 1°, and the dummy bar 1 and all the composite rolls and guide rolls 11 are
14, high-pressure water is sprayed from the cooling nozzle 15 of the cooling zone attached to the lower part of the device.

(9) Immediately pressurize the heated composite rolls with No. 11 landers 9 and 2 landers 10, lower the dummy par 1 and the composite rolls along the guide rolls, and at the same time cool them in the cooling zone, forming the mating rolls. Material T - Manufacture. It was confirmed that the joints of the composite roll manufactured using this method were completely joined.

P In the present invention, the combination of materials for the inner and outer layers in the case of composite/one-metal manufacturing is arbitrary; -0r-steel, 15
Cr1lf4*) kW, and on the other hand, it is preferable to use a vibrator or round steel such as thick-walled carbon steel or low alloy steel as the circular layer material.

[Effects of the present invention]

The present invention, as detailed above, employs a bath pressurization method, which promotes the bath deposition phenomenon at the boundary between the outer layer material and the inner layer material, compared to conventional cast-in rolls. As a result, complete bonding is achieved, and high quality rolls can be manufactured, with the effect that there is less variation in quality. Furthermore, because of the bath pressurization method, the molten metal yield is 100%. However, in conventional rolls, a surface treatment agent is applied to the browning surface to prevent oxidation, and the surface treatment agent is present on the joint surface, causing gas defects or inclusions. In the present invention, no surface treatment agent is used on the bonding surfaces, and a non-oxidizing atmosphere is used, which has the effect of eliminating concerns about gas defects or inclusions on the bonding surfaces.

[Brief explanation of the drawing]

Figures 1 to 4 show a composite roll manufacturing apparatus for carrying out the entire method of the present invention. FIG. 5 is a diagram showing a permanent sprue placed directly above the inner layer material of the composite roll; FIG. 5 is a detailed view of the No. 1 seal cover; and FIG. 1... Dummy bar 2... Dummy bar jig 5... Molding 4... Outer layer material 5... DO thermal coil 6... Inner layer material 7... Hollow part of inner layer material 8... Concave part 9... No, 1 Grange gear 10... N002 Grange gear 11... Guide roll 12... Air hole 13... Cooling nozzle 14... Frame 15... Seal cover 16... Ar gas blowing Nozzle 17...Suction nozzle 18@e/Pouring port 19...Ladle 20...Top lid 21...Y/Dish 22/■Sensor sub-agent 1) Akira 9 representative Ryo Hagiwara - No. Figure 1 Figure 4

Claims (1)

[Claims] When manufacturing a composite roll that is molded on the inner surface of a cylindrical integral mold, an inner layer material (hollow or solid material) that has been preheated in a non-oxidizing atmosphere is installed on the inner surface of the mold, and a wear-resistant layer is placed around it. A method for manufacturing a composite roll, which is characterized by pouring and pressurizing the wear material and then cooling it with water.