JPS61103666A - Manufacture of composite roll - Google Patents

Abstract

PURPOSE:To obtain a composite roll of a high quality by forming a joint surface of a material to be cast-in to an uneven shape, placing it in a cylindrical one body metallic mold, preheating it in a non-oxidizing atmosphere, and thereafter, pouring an pressing a cast-in material, cooling it with water, and widening a contact area of the material to be cast-in to join it completely. CONSTITUTION:Since a molten metal pressurizing system by a plunger 11 is adopted, a deposition phenomenon of a boundary part of a material to be cast-in 4 and a cast-in material is accelerated, they are joined completely, and a high quality roll can be manufactured, and also the yield of the molten metal is improved. Also, it is executed in a non-oxidizing atmosphere without using a surface treating agent for the joint surface, therefore, a care of a gas defect or an inclusion of the joint surface is dissolved. Moreover, since the joint surface of the material to be cast-in 4 is formed to an uneven shape 21, the contact area is widened, and this roll can be applied as a high load roll.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of the Invention] The present invention relates to a method for manufacturing composite rolls used as raw materials for rolling rolls, binion gears, and the like.

[Background technology]

Conventional Manufacturing Methods for Composite Rolls Conventional methods for manufacturing composite rolls have been proposed, including casting a molten metal around a solid or hollow pipe (Japanese Patent Publication No. 44-4903 and 48-5
(Refer to Publication No. 5956) 0 This conventional method uses a pre-formed solid or hollow pipe as the core material (inner layer material) of the composite roll, and coats the surface of this core material with a surface treatment material to oxidize the surface. After preventing this, the molten metal is cast-in to form the outer layer of the composite roll.

Disadvantages of the above-mentioned conventional means The above-mentioned conventional method merely performs casting as a means of forming the outer layer of the composite roll, and as a result, the tight bonding between the inner layer material and the outer layer material, which are the core materials of the composite roll, is incomplete. It has certain drawbacks.

In addition, a surface treatment agent is applied to prevent oxidation of the surface to be cast-in, and as a result, the surface treatment agent is present on the joint surface, causing gas defects or inclusions.

Manufacturing means CI by the present inventors) In order to eliminate the drawbacks of this conventional means, the present inventors proposed the following manufacturing means prior to the present invention. This is basically a method similar to the conventional method described above, but it adopts a method of pressurizing the molten metal after pouring it, and also does not apply a surface treatment agent to the joint surface and joins in a non-oxidized state. It is something. In other words, this manufacturing method uses the core material (
In this method, the outer layer material of the composite roll is formed by forming the inner layer material in advance and pouring molten metal around the outer periphery of this core material. 5, instead of applying a surface treatment agent to the bonding surfaces, the bonding is performed in a non-oxidizing atmosphere.

Manufacturing means by the present inventors [■] In addition, the present inventors have also proposed a novel composite roll manufacturing means that is different from the above-mentioned conventional means prior to the present invention. this is,
Basically, it is the opposite of the conventional method, and the outer layer material of the composite roll is formed into a hollow shape in advance, and molten metal is injected into this hollow part to form the core material (inner layer material of the composite roll). It is something. Also, in this manufacturing means, a molten metal pressurization method is adopted, and the bonding is performed in a non-oxidizing atmosphere, similarly to the manufacturing method CI).

Problems to be solved by the present invention By the way, the conventional means and manufacturing means [I].

(n) corresponds to the core material of the composite roll in both the cast-wrapped material (conventional means and manufacturing method CI), and in the manufacturing method [
■] corresponds to the outer layer material. ) with a smooth finish on the joint surface. Therefore, the contact area between the cast-in material and the cast-in material is small, which has the disadvantage that it is not possible to obtain an optimal high-load roll.

[Object of the present invention]

Therefore, the present invention provides a contact surface 8 between the cast-in material and the cast-in material.
j'? : A high-quality roll that is ideal for use as a high-load roll when expanded! An object of the present invention is to provide a method for manufacturing a composite roll that can be stably manufactured.

[Configuration of the present invention]

As a means to achieve the above object, the present invention employs a method in which the joint surface of the cast-wrapped material is formed into an uneven shape, a molten metal pressurization method, and a joining method in a non-oxidized state. The point is t%. That is, in manufacturing a composite roll to be molded on the inner surface of a cylindrical integral mold, the present invention involves forming the joining surface of a material to be cast into an uneven shape, and arranging the material to be cast on the inner surface of the mold. This method of manufacturing a composite roll is characterized in that the casting material is preheated in a non-oxidizing atmosphere, then poured under pressure, and then cooled with water.

In the present invention, the core material of the composite roll (
The inner layer material) has a good temperature and the outer layer material has a good temperature. Therefore, the present invention is applicable to both of the above-mentioned manufacturing means CI] and (II). ).

Taking as an example the case where the outer layer material of a composite roll is used as a cast-wrapped material, an example of its installation will be explained in detail by dividing into the roll specifications, manufacturing conditions, and manufacturing process.

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

(1) Outer layer material 25 Cr-based cast iron (wear-resistant material) (2
) Outer layer dimensions: outer diameter 300φ x inner diameter 240φ x length 10
00 (m) (3) Inner layer material 5C4 (S) (4) Inner layer dimensions Inner diameter 240φ x length 1800 (simplified)
Manufacturing conditions (1) Outer layer material preheating temperature 900℃ (However, when preheating A
(2) Inner layer material casting temperature: 1550°C (3) Molten metal pressurization force (fly 1 plunger) 226 tons (stress 5kg/sao 2) (4) Molten metal pressurization Time: 60 seconds (5) Outer layer pressing force (two plungers): 52 tons (stress: 2 kg/rm") Note) Vertical grip: maximum pressing force of 500 tons was used.

Manufacturing Process The process of manufacturing a composite roll according to the above specifications and manufacturing conditions will be explained in detail with reference to FIGS. 1 to 4. Figure 1 shows the molten metal pressurized in the composite roll manufacturing equipment, Figure 2 shows the seal cover, Figure 3 is a sectional view taken along the line A-A in Figure 1, and Figure 4
The figure shows molten metal pouring in a composite roll manufacturing device.

(1) Outer diameter 300φ x inner diameter 240φ x length 10 in advance
00 outer layer material 4 is manufactured and prepared by a casting method. However, the joint surface on the inner surface side of the outer layer material 4 is finished into an uneven surface 21 by machining (see FIG. 3). Then, this uneven surface 21 is thoroughly degreased with trichlorethylene.

(2) Hold the dummy par 1 on the dummy par jig 2,
An outer layer material 4 is installed on the convex portion of the dummy par 1.

(3) Thereafter, a cylindrical integral mold 3 having an inner diameter of 305 φ x an outer diameter of 400 x a length of 2300 mm is installed around the outer layer material 4 on the pedestal 16 . However, the outer periphery of the mold S is removable and has a vertical drive mechanism (range 200 m/min to 1
000 m/m1n) high frequency induction heating coil 8
is attached.

(4) Drive the high frequency heating coil 8 up and down to
And the outer layer material 4 is preheated, but in this case, the inner surface side of the outer layer material 4 is preheated uniformly (top, bottom, center) until it reaches 900°C. However, at the start of preheating, in order to prevent oxidation on the inner surface of the outer layer material 4, a seal cover 6 equipped with an Ar gas blowing nozzle 7 and a blowing nozzle 9 is installed, and Ar gas is continuously blown from the Ar blowing nozzle 7. It was crowded.

(5) When the inner surface of the outer layer material 4 reaches 900°C, stop preheating. However, Ar gas is continuously blown in, and after removing the upper cover 18 of the seal cover 6, a tundish 19 with a long nozzle is inserted into the upper hole of the seal cover 6.

(6) After putting the pre-melted molten metal (SC46) into the ladle 17, it is poured through the tundish 19 to form 10 g of the inner layer material of the composite roll on the inner surface side of the outer layer material 4, which is a molten metal at 1550°C.

However, the amount of poured molten metal is determined by the sensor 2 attached to the inner surface of the outer layer material 4.
Detected at 0.

(7) After pouring the molten metal, remove the tundish 19 and the Ar seal cover 6, and immediately place the molten metal in the vertical press.
Gradually pressurize with 11L1 grunge 11, pressurizing force 22
Although the load was up to 6 tons, the pressurization time during this time was about 60 seconds. In addition, 12 is an air hole, and the first plunger 1
1. This is the air vent opening when inserted.

(8) After the above operation is completed, open the dummy par holding jig 2, and at the same time open the cooling nozzle 15 of the cooling zone attached to the lower part of the device.
High-pressure water is emitted from the

Immediately mi Mi Granger 1 and Zui 2 Plunger 13
The heated composite roll is pressurized and the dummy par 1 and the composite roll are lowered along the guide roll 14 and simultaneously cooled in a cooling zone to produce a composite roll material.

It was confirmed that the joints of the composite rolls were completely joined.

In addition, in FIGS. 1 and 4, 5 is a dimension adjustment material, which is inserted when the outer layer material 4 of the composite roll is only near the center of the mold 6. [Effects of the present invention] As described in detail above, the present invention is an improved method of the manufacturing means CI) and (II), and is an improved method of the manufacturing means CI) and (II).
All of the effects described in II) are produced. That is, since the present invention employs a molten metal pressurization method, it promotes the bath deposition phenomenon at the boundary between the cast-in material and the cast-in material, compared to the conventional cast-in roll. The result is a complete bond,
High-quality rolls can be manufactured, and there are also fewer defects in quality. In addition, since the molten metal is pressurized, the molten metal yield is 100 cm. Furthermore, in conventional rolls, a surface treatment agent is applied to the surface to be cast to prevent oxidation, and the surface treatment agent is present on the joint surface, causing gas defects or inclusions. In the present invention, since no surface treatment agent is used on the joint surfaces and a non-oxidizing atmosphere is used, there is an effect that concerns about gas defects or inclusions on the joint surfaces are eliminated.

Moreover, in the present invention, since the joint surface of the cast-wrapped material is made into an uneven shape, the contact area is significantly widened, making it applicable as a high-load P-ru, and furthermore, the joint surface of the cast-wrapped material The joint strength of the cast-in material is the same as that of the conventional shape, but even if there is an unjoined part, the shape is mechanically joined, which solves practical problems, etc. and the above-mentioned manufacturing means CI), a remarkable effect not seen in (n) is produced.

[Brief explanation of drawings]

Figure 1 shows the molten metal being pressurized in the composite roll manufacturing equipment, Figure 2 shows the seal cover, Figure 5 is a sectional view taken along the line A-A in Figure 1, and Figure 4 shows m-metal pouring in the composite roll manufacturing equipment. Show the time. 1... Dummy bar 2... - Dummy bar jig 3... Mold 4... Outer layer material 5... Dimension adjustment material 6... Seal cover 7... Ar blow nozzle 8... Heating coil 9... Blowout nozzle 10... Inner layer material 11... N111 plunger 12... Air hole 13... m2 plunger 14... Guide roll 15... Cooling nozzle 16... Frame 17...・Ladle 1 day...Top lid 19...Tundish 20...Sensor 21...Uneven surface Sub-agent 1) Meifuku agent Ryo Hagihara -

Claims (1)

[Claims] In manufacturing a composite roll to be molded on the inner surface of a cylindrical integral mold, the joint surface of the cast material is formed into an uneven shape, the cast material is placed on the inner surface of the mold, and the roll is rolled in a non-oxidizing atmosphere. A method for manufacturing a composite roll, which comprises preheating, pouring and pressurizing a casting material, and then cooling with water.