JPS6372407A - Production of irregular sectional shape by pack rolling - Google Patents

Abstract

PURPOSE:To enable production of irregular sectional broad and thin sheets of nonferrous metals such as Ti or alloy Ti and high alloy steels with high efficiency, yield and accuracy by laminating>=2 sheets of the irregular sectional sheets coated with a release agent and using a pack rolling method. CONSTITUTION:The Ti stock having the irregular section to be rolled as a core 1 is sandwiched from above and below by sheets of cover materials 2 and the periphery thereof is hermetically sealed by welding spacers 3 thereto over the entire periphery The release agent is coated between the Ti stock of the core material 1 and the cover materials 2 and between the stocks of the core material 1 to prevent the welding of the stocks by rolling. Air is then evacuated from the inside of the pack rolled stock and a vacuum is maintained therein or a gas is sealed therein. The stock is rolled in such atmosphere. The pack rolled stock is then heated up to the rolling temp. and is subjected to hot rolling. The pack rolled stock is disassembled after the rolling and the core materials 1 are striped. The release agent is removed therefrom and the surfaces are conditioned. The products are thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for hot manufacturing wide and thin deformed plates of nonferrous metals such as pure Ti or alloyed Ti, and high alloy steel. It is something.

[Conventional technology]

For example, pure Ti or alloyed Ti is often used as corrosion resistance, strength members for aircraft, trench construction materials, etc. due to its corrosion resistance and specific strength.

To use these parts, materials supplied in the form of plates, rods, shapes, ingots, pipes, etc. are cut, ground, and
@Machining such as 2 bending before use.

However, Ti and Ti alloys generally have poor workability, and at present most of the cost, manufacturing time, and process are spent on this machining.

For the above-mentioned reasons and to improve yield, there is a need for a material that is as close to a component as possible, a so-called near net ape.

However, those made by forging are common, and those made by rolling do not exist.

On the other hand, a laminated rolling method (pack rolling method) is normally used to produce thin plates of TI and Ti alloys.

This method involves laminating one or more core materials coated with a release agent on the surface, covering the top and bottom with cover materials, surrounding them with spacers, and then welding and assembling the laminated rolled materials, which are then hot rolled. It manufactures thin plates.

[Problems to be solved by the invention]

The present invention provides a method for efficiently manufacturing plates of non-ferrous metals such as pure Ti or alloyed Ti, and high alloy steel, with wide widths, thin materials, and irregular cross-sections, by a laminated rolling method, with improved yield and accuracy. The purpose is to

[Means for solving problems]

The present invention utilizes the laminated rolling method (pack rolling method) which is normally used to produce thin plates of Ti and Ti alloys,
It manufactures plates with irregular cross sections.

That is, in the present invention, two or more core materials coated with a release agent on the surface are laminated, the top and bottom of the core materials are covered with cover materials, the periphery is surrounded by spacers, and the assembled laminated rolled material is hot-rolled by welding. In the method, the core material is a plate with an irregular cross section, and the method is for producing a irregular cross-section material by pack rolling, in which the core material is a plate with an irregular cross section.

[Effect]

FIG. 1 shows the structure of the laminated rolled material in cross section.

In the figure, 1: core material, 2: cover material, 2.3 varnish spacer, 4: welded part.

In the following text, Tl material will be described as an example.

As shown in Fig. 1, a Ti material to be rolled as a core material 1 is sandwiched between pure iron or steel plates as a cover material 2 from above and below, and a smoother 3 is welded around the entire circumference and sealed. do.

Furthermore, a release material is applied between the T1 material of the core material 1 and the steel of the cover material 2, and between the material of the core material 1 to prevent welding of the materials due to rolling.

Next, air is evacuated from the laminated rolling material, vacuum or gas is filled in, and the material is rolled in that atmosphere.

Next, the laminated rolled material is heated to a rolling temperature and hot rolled. After rolling, the laminated rolled material is decomposed, the core material 1 is peeled off, the release material is removed, and the surface is cleaned to obtain a product.

In the above process, when configuring the laminated rolled material,
By incorporating the core material 1 with a modified cross section in advance, a thin plate with a modified cross section similar to the core material 1 can be obtained.

As shown in FIG. 2 of the embodiment described below, for example, by rolling an 8N layer rolled material in which tapered core materials 1 of the same shape are stacked alternately, a thin plate with a very fine taper can be obtained. It will be done.

However, at this time, it is necessary that the core material 1 and the cover material 2 are in contact with each other without any gaps, and if a material with gaps is rolled as shown in FIG. Unlike others, cracks occur in the core material 1 in the laminated rolled material, making it useless as a product.

As another example, as shown in Figure 6, small Ti plates are lined up tightly between two Ti core materials (top and bottom), and the release material is applied to the surface that is not to be joined, but not to the surface that is to be joined. Constitutes a lap laminated rolled material. After this is heated and rolled, it is annealed for a long time to bond the Ti to each other by diffusion bonding. When this material is disassembled and the Ti is peeled off, a thin plate having an irregular cross section as shown in FIG. 7 is obtained.

Thus, according to the method of the present invention, thin plates with various irregular cross-sections can be obtained.

Next, examples of the present invention will be described.

〔Example〕

5S41 as cover material 2. T1-June-4 on core material 1
A laminated rolled material prepared by applying alumina powder as a release material and welding a stacked spacer 3 around it using various cross-sectional shapes shown in (2) shown below was hot rolled under the following rolling conditions. A modified cross-section material was produced by rolling.

Rolling conditions Rolling mill: Four-high rolling mill Work roll diameter: 1200φm+n Rolling speed: 40 rpm (1) Example of tapered material Figure 2 shows an example of manufacturing a tapered material.

The tapered core materials 1 were laminated in an alternating manner as the core materials 1, and a tapered thin plate was created under the above-mentioned conditions.

However, at this time, it is necessary that the core material 1 and the cover material 2 are in contact with each other without any gaps, and if you roll something with a gap as shown in Figure 3, some parts will not be rolled and the elongation of that part will occur. However, unlike the others, waves were generated in the core material 1 in the laminated rolled material, making it useless as a product.

(2) Examples of objects that overlap without any gaps when stacked vertically symmetrically or asymmetrically As shown in Fig. 4, the core materials 1 are stacked and brought into contact with each other without any gaps, and a release material 6 is applied between them and between the core materials 1 and the cover materials 2.
A laminated rolled material was prepared by coating the material, and hot rolling was carried out under the above rolling conditions to produce a thin plate having a vertically symmetrical irregular cross section as shown in FIG.

(3) Example of manufacturing using dummy materials As shown in Fig. 8 (If a gap occurs between the core material 1 and the earth, insert the dummy material 7 into the gap to fill the gap. Thus, the same as the other examples When hot rolled, a thin plate with an irregular cross section as shown in FIG. 9 was obtained.

(4) Stack a large number of parts, and after rolling, diffusion bond them. , and then stack them to form a laminated and rolled material without applying it to the surfaces that you want to join. After this was heated and rolled, it was annealed for a long time to diffusion bond Ti to each other. When the f''J material was divided into 7 parts and the TI was peeled off, a thin plate having an irregular cross section as shown in FIG. 7 was obtained.

(5) Other Examples As shown in FIG. 10, the portion of the release material 6 coated between the core materials 1 constitutes a laminated rolled material, and when hot rolled, the 11th
We were able to manufacture a thin plate with an irregular cross section as shown in the figure.

〔Effect of the invention〕

According to the method of manufacturing a modified cross-sectional material by back rolling of the present invention, the following effects are achieved.

(1) The irregular cross-sectional plate has a good yield (and can be manufactured efficiently).

(2) Compared to machining a flat plate into an irregular cross section, the cutting process can be omitted, which is useful for improving yield and reducing costs. (3) An irregular cross section plate can be manufactured with high precision.

(4) Hold-shaped products can be manufactured by rolling.

[Brief explanation of the drawing]

Figure 1 is an explanatory diagram showing the structure of the laminated rolled material, Figures 2-
FIG. 11 is an explanatory diagram for manufacturing thin plates with various irregular cross sections shown in the examples. In the figure, 1: core material, 2: cover material, 3 varnish spacer, 4: welded part, 5: gap, 6: release material, 7: gummy material. It should be noted that the reference numerals in each figure indicate the same or equivalent parts.

Claims (1)

[Claims] In a method of laminating two or more core materials coated with a release agent on the surface, covering the top and bottom of the core materials with cover materials, surrounding them with spacers, and welding and assembling the laminated rolled material, the core material is hot rolled. A method for manufacturing a material with a modified cross section by pack rolling, characterized in that the material is made into a board with a modified cross section.