JPS5893812A - Production of kitchen knife iron - Google Patents

Abstract

PURPOSE:To obtain a kitchen knife iron having the properties equivalent to those of kitchen knife iron produced by conventional methods by laminating thin mild iron sheets formed with oxide scale layers or thin mild iron sheets by inserting oxide scale plates between the sheets and sealing the circumferential ends of the laminated sheets by welding then subjecting the same to hot rolling or forging. CONSTITUTION:A thin mild iron sheet 1 for outlery is heated in a heavy oil furnace 3 to form oxide scale layers on the surfaces. A desired number of sheets of the oxidized sheets are laminated and are coated with cover sheets, then the entire circumference is sealed by welding to form laminated sheets W. The laminated sheets W are subjected to hot rooling or forging at 30% draft or reduction ratio, whereby the kitchen knife iron dispersed with the oxide scale layers into fine and uniform layers is obtained. The intended kitchen knife iron is produced as well by inserting oxide scale plates 2 between the sheets 1 and subjecting the same similarly to hot rolling or forging.

Description

DETAILED DESCRIPTION OF THE INVENTION This book 4-/1 relates to the Jlila method of 4j, Chosen.

Knife iron is a knife for household use and a blade for carpentry tools.1. It has been used as the base material for #A tools for many years, but its construction is generally done using a charcoal furnace or a paddle furnace that uses coal as fuel.
In the reverberatory furnace of Azu, charcoal t in half mmL, as is converted to global warming gold-fL.
It has been excreted by the old s-ray method, which involves taking out the paste and adding mW to it, but in recent years, as the manufacturing method has become obsolete, it is almost no longer manufactured.

However, this knife iron contains many layers of non-metallic inclusions mainly composed of pure iron chloride, so unless it is honed with a whetstone, it is extremely soft and has a noticeable drop. It has properties such as good floor bonding because it is porous and electrochemically tactile due to the porosity in the iron base. It is indispensable as a base material for various types of cutlery, and the current situation is that the industry is only able to meet its demand by salvaging monuments from dilapidated iron bridges and towers and sunken ships. It is.

Therefore, the 0 non-inventive number is 41I, which is a cheap knife iron on an industrial scale.
u! As a result of extensive mechanical research, we found that when soft iron snarl is subjected to surface oxidation treatment to form an oxide scale layer, and this is laminated and rolled or forged, a fine snarl oxide layer is formed in the rolled or forged material. We have completed the present invention by discovering that a dispersed metal composite material dispersed in a uniform layer can be produced and has physical properties comparable to that of knife iron, which is processed using conventional methods.

That is, one object of the present invention is to melt and seal the peripheral edge of the oxide scale layer on the surface, then subject it to hot rolling or forging processing, and then forging I! 'Providing a reduction rate or processing rate of 30% or more at temperature,
VI Dispersing the oxide scale layer into a fine uniform layer
The purpose of the present invention is to provide a method for manufacturing knife iron used as a spear.

Generally, knife iron has a o, oN, os%@B10.
03~Q, 10%, MnO, 10~0.30%, P
O0θlO~0, 030%, 80.002~0.020
%, with the balance consisting of iron, so as a starting material, a steel plate for porcelain or enamel that matches the above composition (hereinafter referred to as "steel plate") can be used as a starting material.

Unless otherwise specified, tsi (referred to as soft iron thin plate) is used.

In the laminate, it is preferable that a plurality of oxide scale layers are inserted into the iron base, and the surface of the soft iron thin plates is oxidized and laminated, or the soft iron ultrathin plates corresponding to the oxide scale layers are substantially oxidized by oxidation treatment. A scale layer formed entirely on the surface (
It is formed by inserting an oxidized scale plate (also referred to as an oxide scale plate) between two iron plates and sealing it by welding the entire periphery.

The oxide scale layer is F@! OH*lFe1O4
The oxide in the 1Fe field is uniformly dispersed, resulting in a porous structure.

The depth of the oxide scale layer is determined in relation to the plate thickness.
! For j13~,3;a, O,S~/411 is practically appropriate.

When inserting an oxide scale plate, use 0 as the scale plate.
．． 3~/1111, l! When using Iilized scale wool, scale wool is ignited and oxidized to make approximately 10% or more iron oxide. Although it is determined depending on the physical properties, by performing forge welding at an initial reduction rate or working rate of 3° or higher, the built-in oxide scale is completely broken through fil and fi, making it possible to expand the welding of iron. It has been found that a predetermined bond is achieved through composite dispersion, and crystal grains are also integrated during the recrystallization process. When inserting a # scale plate, the reduction ratio at the forge welding temperature is preferably 33% or more.

Thereafter, it is rolled or pressure-intensified to a predetermined thickness according to the 's method.

The nine SAs will be explained below based on Section I4-.

-10 As shown in Figure 1, m soft iron for cutlery (5AW1001
')jX100X7001111 (1) tt, 10
00'(! tf in / 0 min tlllyth furnace (3)
f1ML, , Surface kCO, # No. Forms an oxide scale layer with a grain size of 3161. Seven of these oxidized boards were assembled, covered with a fins-thick cover sheet, and sealed and welded around the entire periphery to form the soundboard.

It is heated to a temperature of 1199° C., subjected to hot rolling (4), and reduced from fine to /Qtx to forge welding to obtain knife iron. In this rolling process, * from the side U to 3/
, jsrtx, the impurities of the oxidized scale are completely broken into pieces, and the crystals are made uniform by recrystallization. The outline and introduction are shown in the cross-sectional mirror photograph in Figure 3.

Example ■ As shown in 2nd tA, extremely soft iron for cutlery (5hya10
01'), 3-X100X700I! 1IC1), Oyohi yh-ty-f theory coal board SPP, y engineering SG
3/33C/9♂/')0.3X100X700
#1 (2) Wow, m material! : L/, d6T(2) wotll 'J ychi na furnace (3) 7θ min #1a)Jr
Heat to 1 and form an oxide scale layer of about □ and 2 ff on each surface to form an oxide scale plate (2). J sheets of these oxide scale plates were laminated by inserting them between two sheets of very soft iron so as not to cause any damage, and then covered with a 54-thick cover sheet and welded all around to form a 172.3x/10x710 tx. Laminated board W
′ is formed. Heat this to 7100℃, 4 degrees, +1
A rolling reduction of 35% or more is applied at the beginning, and the steel is finally rolled to a thickness of 35% to obtain a knife iron.

Test examples, 4th example ■ and ■ A cutlery is made by a conventional method using the knife iron as a base material for a cutlery, a cutlery is made in a second way using disassembled iron from a railway bridge etc. as a base material, and a cutter is made by a free cutting method. sex.

As for forge weldability, the results of a comparative test showed that both were good, compared to knife iron, which was conventionally 91m long using the old 4-iron method. It was found that the effect of i'J is superior.

[Brief explanation of drawings]

FIG. 7 is a process explanatory diagram showing an example of forgery according to the present invention;
The figure is a process explanatory diagram showing another example A, and Figure 3 shows the inside of the knife iron obtained by the method of Example ①! ! Cross section showing the 6th group Jyoga eIk
It's a photo shoot. (1)...Soft iron thin plate (extremely soft iron), L2)...
Oxide scale plate, (3)...Oxidation treatment furnace, (4)...
・Rolling e! Son-in-law. Patent applicant: Kirin Hamono Co., Ltd. Patent attorney Koji Togawa

Claims (1)

[Claims] ■ Soft sake with T-scale coating on the surface.
f: After sealing the d layer, subjected to hot rolling or forging treatment,
Reduction rate of at least 30% or IJO at wet liquid temperature
Yu Dingkyo's A-saki method is to give a high labor rate and make the heated steel layer into a homogeneous layer.