JPH01289539A - Exothermic pad - Google Patents
Exothermic padInfo
- Publication number
- JPH01289539A JPH01289539A JP11836988A JP11836988A JPH01289539A JP H01289539 A JPH01289539 A JP H01289539A JP 11836988 A JP11836988 A JP 11836988A JP 11836988 A JP11836988 A JP 11836988A JP H01289539 A JPH01289539 A JP H01289539A
- Authority
- JP
- Japan
- Prior art keywords
- pad
- exothermic
- casting
- heating pad
- prevented
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005266 casting Methods 0.000 claims abstract description 31
- 239000000843 powder Substances 0.000 claims abstract description 12
- 229910000480 nickel oxide Inorganic materials 0.000 claims abstract description 11
- GNRSAWUEBMWBQH-UHFFFAOYSA-N oxonickel Chemical compound [Ni]=O GNRSAWUEBMWBQH-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 abstract description 10
- 239000010959 steel Substances 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 9
- 230000015572 biosynthetic process Effects 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000006722 reduction reaction Methods 0.000 abstract description 4
- 229910001208 Crucible steel Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract 1
- 229910052751 metal Inorganic materials 0.000 abstract 1
- 239000003110 molding sand Substances 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 239000010410 layer Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000004576 sand Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 235000004789 Rosa xanthina Nutrition 0.000 description 1
- 241000109329 Rosa xanthina Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000007849 furan resin Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 210000003097 mucus Anatomy 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910052845 zircon Inorganic materials 0.000 description 1
- GFQYVLUOOAAOGM-UHFFFAOYSA-N zirconium(iv) silicate Chemical compound [Zr+4].[O-][Si]([O-])([O-])[O-] GFQYVLUOOAAOGM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は鋼鋳物の鋳型に適用される発熱パッドの改良に
関し、特に鋳物表面の硬化を起さ表す発熱パッドに関す
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a heating pad applied to a mold for steel casting, and more particularly to a heating pad that causes hardening of the surface of the casting.
鋳物の製造において、薄肉部、肉厚交差部あるいは肉厚
変動部を有する鋼鋳物では凝固時に肉厚中心部への給湯
不足により中心線引は巣等の鋳造欠陥が発生し、品質不
良となる。In the manufacturing of castings, in steel castings that have thin wall areas, wall thickness intersections, or wall thickness variation areas, casting defects such as cavities occur in center drawing due to insufficient hot water supply to the center of wall thickness during solidification, resulting in poor quality. .
これを防止するため、当該部分の鋳型に発熱パッドを使
用し、凝固速度を制御している。この鋳物の内部欠陥防
止策の一例として、薄肉り字型試験片に発熱パッドを適
用した場合の一般的な鋳造方法を第2図(A)と同図の
■−■纏矢視図である第2図(Bl k示す。To prevent this, a heating pad is used in the mold in that area to control the solidification rate. As an example of measures to prevent internal defects in this casting, a general casting method in which a heating pad is applied to a thin-walled L-shaped test piece is shown in Figure 2 (A) and a cross-sectional view of the same figure. Figure 2 (Blk shown).
第2図(4)、(刑において、定盤10と鋳枠11で囲
まれた内に、湯口1、湯道2、押湯9を備えた鋳型を鋳
物砂7で製作したのち、溶鋼5を鋳込むと発熱パッド4
が溶鋼5により発熱して、薄肉部等の早過ぎる凝固を抑
え、中心線引は巣のない鋳物が製造できる。Figure 2 (4), (In the process, a mold with a sprue 1, a runner 2, and a riser 9 is made from foundry sand 7, surrounded by a surface plate 10 and a casting flask 11, and then a molten steel 5 When you cast the heating pad 4
The molten steel 5 generates heat, suppressing premature solidification of thin-walled parts, etc., and center drawing allows the production of cavity-free castings.
しかし、上記の発熱パッド4に接した鋳肌面には、鋳物
肉厚により異なるが、一般に、2諺程度の厚さの表面硬
化層が形成される。However, on the casting surface in contact with the heating pad 4, a hardened surface layer is generally formed with a thickness of about 2 mm, although it varies depending on the thickness of the casting.
この硬化層は、延性がな込(曲げ角度500にて割れ発
生)ために鋳肌のま!では使用できない。従って、従来
は溶鋼と接するパッド4面にジルコン系塗型剤を塗布し
て上記の硬化層の形成を防止しようとしているが、実際
にはその効果は殆んど期待できなかった。This hardened layer has reduced ductility (cracks occur at a bending angle of 500 degrees), so it remains like a cast surface! cannot be used. Therefore, in the past, attempts have been made to prevent the formation of the above-mentioned hardened layer by applying a zircon type coating agent to the four surfaces of the pad that come into contact with molten steel, but in reality, almost no effect could be expected.
本発明者等は、発熱パッドを使用する鋳物の製造におけ
る発熱パッドに接した鋳肌面の表面硬化を防止すべく研
究を重ねた結果、この硬化要因はムtであることを見出
した。即ち、硬化層を定量分析したところ、パッドなし
の鋳肌面に比べて約70倍のムを含有量を有しておシ、
また硬化層のミクロ組織にはA4 AtNの針状晶が見
られた。The inventors of the present invention conducted repeated research to prevent surface hardening of the casting surface in contact with the heating pad in the production of castings using the heating pad, and as a result, they discovered that the hardening factor is due to the hardening. In other words, quantitative analysis of the hardened layer revealed that it contained about 70 times more mucus than the cast surface without padding.
In addition, needle-like crystals of A4 AtN were observed in the microstructure of the hardened layer.
そこで、本発明者等は、とのALが発熱パッドの成分た
るklによる亀のと考え、鋳型界面(パッド面)にてパ
ッド中のAtの拡散を防止すれば、上記硬化反応を抑え
得るとの結論に達した。Therefore, the present inventors believe that the AL of and is caused by kl, which is a component of the heating pad, and that the above-mentioned curing reaction can be suppressed by preventing the diffusion of At in the pad at the mold interface (pad surface). reached the conclusion.
本発明は、この硬化反応を起さない発熱パッドを提供す
ることを目的とするものである。An object of the present invention is to provide a heating pad that does not cause this curing reaction.
本発明は、上記目的を達成するために、発熱パッド粉末
混合物中にニッケル酸化物をα3重重量板上でかつ15
重量−未満含有させることを特徴とするものである。In order to achieve the above object, the present invention provides a heating pad powder mixture containing nickel oxide on an α3 heavy weight plate and 15
It is characterized by containing less than - by weight.
本発明では、発熱パッド粉末中にAt と容易に還元反
応を起すニッケル酸化物を予め添加してあり、このニッ
ケル酸化物によりAtが溶鋼中へ拡散することを防止す
る。In the present invention, nickel oxide, which easily causes a reduction reaction with At, is added in advance to the heating pad powder, and this nickel oxide prevents At from diffusing into the molten steel.
例えば、パッド中で、Atとニッケル酸化物が2At+
3NiO= 3Ni+ムtz O。For example, in the pad, At and nickel oxide are 2At+
3NiO=3Ni+MutzO.
で示される還元反応を生起し、Atの溶鋼中への拡散が
防止される。The reduction reaction shown by occurs, and the diffusion of At into the molten steel is prevented.
ニッケル酸化物が発熱パッド粉末混合物のα3重量%未
満であれば、少な過ぎて上記の還元反応によりムtの溶
鋼への拡散を防止することができず、逆ICl3重量−
以上になると、多過ぎて発熱パッド本来の発熱効果が阻
害されて引は巣等の鋳造欠陥を生じてしまう。If the nickel oxide is less than α3% by weight of the heating pad powder mixture, it is too small to prevent the diffusion of Mut into the molten steel by the above reduction reaction, and the reverse ICl3 weight -
If the amount is too much, the heat generating effect of the heat generating pad is inhibited, and casting defects such as cavities occur.
実施例1
発熱パッド粉末として明相化学工業社製のP290−N
を用り、該粉末に第1表に示す種々の割合でNiO粉末
(粒度10μ以下)を添加した。これらI/c48ボー
メの珪酸ソーダを81.(重量)添加して混練し、平板
を成型後、炭酸ガスによる硬化反応を利用して発熱パッ
ドを試作した。Example 1 P290-N manufactured by Meiso Kagaku Kogyo Co., Ltd. as heating pad powder
NiO powder (particle size of 10 μm or less) was added to the powder at various ratios shown in Table 1. These I/c48 Baume silicate sodas are 81. (weight) was added and kneaded, and after molding a flat plate, a heating pad was prototyped using the curing reaction caused by carbon dioxide gas.
なお、上記P290−Hの成分を次に示す。The components of the above P290-H are shown below.
kt:24.5To、ムtgo、:5&5%、810.
:&9チ、F’eO: 14 %%F0201 : 1
6 %、K、0:1.3チ(重量%)
次に、上記のようにして試作した発熱パッドを評価する
ために、第1図(A)と同図の1−1線矢視図である第
1図(Blに示す鋳造方案にて鋳込試験を実施した。こ
のときの鋳型造型手順は次の通シである。kt: 24.5To, Mutgo: 5 & 5%, 810.
:&9chi, F'eO: 14%%F0201: 1
6%, K, 0:1.3chi (weight%) Next, in order to evaluate the heating pad prototyped as described above, FIG. A casting test was carried out using the casting method shown in FIG. 1 (Bl).The mold making procedure at this time was as follows.
第1図(A)、 (B)におhて、
(1) 定盤10上に鋳枠11を設置し、床砂として
フランプロセス(鋳物砂にフラン樹脂を1〜1,5チ/
砂、硬化剤を20〜50%/樹脂添加混合し、鋳型造型
するプロセス)のフリーマントルケイ砂(オーストラリ
ア産の、球状粒形を呈し、日10エ を99.5 %以
上含有する鋳物砂)7を搗き固める、
(2) 鋳造用押湯スリーブ3内の所定位置に本発明
発熱パッド4を差込むと共だ、該スリーブ3の上、下に
ガス抜き6と湯道2を配し、該湯道に湯口1を配置して
、更にフリーマントルケイ砂7を投入、搗き固めて鋳型
造型を完了する。In Figure 1 (A) and (B), (1) Place the casting flask 11 on the surface plate 10, and use the furan process as bed sand (1 to 1.5 inches of furan resin is added to the foundry sand).
Freeman Torsil sand (Australian foundry sand that has a spherical grain shape and contains 99.5% or more of 10E) (2) Insert the heating pad 4 of the present invention into a predetermined position in the casting feeder sleeve 3, and arrange the gas vent 6 and runner 2 above and below the sleeve 3, A sprue 1 is disposed in the runner, and Freeman silica sand 7 is further introduced, pounded and hardened to complete mold formation.
なお、上記鋳型は本発明発熱パッド4の周囲が溶鋼と接
する方案であり、苛酷な条件下での評価である。The mold described above is a mold in which the periphery of the heating pad 4 of the present invention comes into contact with molten steel, and the evaluation was conducted under severe conditions.
上記鋳型に鋳鋼(SC!46)を1560℃建て鋳込み
試験した。鋳込試験後、本発明発熱パッド4に接してい
る鋳物5の中央部から試験片8を採取し、表面硬化深さ
を光学顕微鏡にて観察した。その結果を第1表に示す。Cast steel (SC!46) was built in the above mold at 1560°C and tested. After the casting test, a test piece 8 was taken from the center of the casting 5 in contact with the heating pad 4 of the present invention, and the depth of surface hardening was observed using an optical microscope. The results are shown in Table 1.
第1表中、&9の比較例は、酸化物を添加しない発熱パ
ッド(従来材)を使用した場合であり、この表面硬化深
さはα38+imであった。これに対してニッケル酸化
物含有発熱パッドを使用したA1−90例では、NiO
が0.3%(重i)でその効果を顕著に発揮しはじめ(
’42)、0.5チ(重量)以上で表面硬化層の形成は
防止できる(43〜8)ことを確認した。In Table 1, Comparative Example &9 uses a heating pad (conventional material) to which no oxide is added, and the surface hardening depth was α38+im. On the other hand, in the A1-90 example using a heating pad containing nickel oxide, NiO
begins to show its effect significantly at 0.3% (weight i) (
'42), it was confirmed that the formation of a surface hardening layer could be prevented at 0.5 inches (weight) or more (43-8).
第1表 ニッケル酸化物の添加量と表面硬化深さとの関
係
但し、NiOが15チ(重量)のもの(A8)について
は、前述の第2図の鋳造方案にて鋳込試験を行い、光学
顕微鏡にて観察した。この結果、表面硬化層は形成され
ていなかったが、薄肉鋳物(板厚50隅)の中央断面を
切断した結果、内部に中心線引ケ巣が形成されていた。Table 1 Relationship between the amount of nickel oxide added and the depth of surface hardening However, for the NiO 15 inch (weight) (A8), a casting test was conducted using the casting method shown in Figure 2 above, and the optical Observed with a microscope. As a result, no surface hardening layer was formed, but as a result of cutting the center cross section of the thin casting (plate thickness: 50 corners), a centerline hole was formed inside.
この現象は、NiOの添加量が過剰になると、発熱パッ
ド本来の発熱効果を阻害してbることを示唆している。This phenomenon suggests that if the amount of NiO added is excessive, it inhibits the heating effect inherent to the heating pad.
実施例2
実施例1の明相化学工業社製のP290−Hに代えて同
社製の第2表に示す成分の発熱バラ)’P290−■、
P−290−■、P290−2Fを用い、第3表に示す
割合でNiO扮末(粒度10μ以下)を添加した以外は
、実施例1と同様にして鋳込試験および該試@後の光学
顕微鏡観察を行った。この結果を第3表に合わゼて示す
。Example 2 In place of P290-H manufactured by Meiso Kagaku Kogyo Co., Ltd. in Example 1, heat-generating roses made by the same company with the components shown in Table 2)'P290-■,
P-290-■, P290-2F were used, and the casting test and optical test after the test were performed in the same manner as in Example 1, except that NiO powder (particle size 10μ or less) was added at the ratio shown in Table 3. Microscopic observation was performed. The results are also shown in Table 3.
第3表 ニッケル酸化物の添加量と表面硬化深さとの関
係以上の結果、発熱パッド材中へのNiOの添加量がQ
lチ(重量)以上、特に15チ(重量)以上の場合では
表面硬化層の形成がほぼ防止され、また15チ(重量)
以上添加すると本来の発熱効果が阻害されるために、本
発明ではNiOの添加量をα3チ(重量)以上で15%
(重量)未満とする。そして、その最も好ましい添加量
は第1表よりcL5〜10チ(重量)であることを確認
した。Table 3 Relationship between the amount of nickel oxide added and the depth of surface hardening The above results show that the amount of NiO added to the heating pad material is
When the thickness is 1 inch (weight) or more, especially 15 inch (weight) or more, the formation of a surface hardening layer is almost prevented;
Since the original exothermic effect is inhibited if more than 10% is added, in the present invention, the amount of NiO added is 15% by weight or more.
(weight). It was confirmed from Table 1 that the most preferable addition amount is 5 to 10 cL (by weight).
なお、ニッケル酸化物としてNiO以外の酸化物を添加
しても表面硬化防止に効果があることを確認している。It has been confirmed that adding an oxide other than NiO as the nickel oxide is effective in preventing surface hardening.
本発明発熱パッドを適用することにより、鋳物表面の硬
化層形成が防止でき、この結果、肉厚が均一でない鋳物
の場合であっても、厚肉部に引は巣等の鋳造欠陥が生じ
ることなく、高品質の製品を得ることができる。By applying the heating pad of the present invention, it is possible to prevent the formation of a hardened layer on the surface of the casting, and as a result, even in the case of a casting whose wall thickness is not uniform, casting defects such as shrinkage cavities will occur in the thick part. You can get a high quality product without any hassle.
第1図(Al、 (Blは本発明の一実施例として評価
した鋳造方案を示す図で、第1図(B)は第1図(A)
のI−1線矢視図、第2図(A)、 (B)は従来及び
本発明の一実施例としての鋳造方案を示す図で、第2図
(B)は第2図(A)の■−■線矢視図である。Figure 1 (Al, (Bl) is a diagram showing a casting method evaluated as an example of the present invention, Figure 1 (B) is Figure 1 (A)
Figures 2 (A) and 2 (B) are diagrams showing conventional casting methods and an embodiment of the present invention, and Figure 2 (B) is a view taken along the line I-1 of Figure 2 (A). It is a view taken along the line ■-■.
Claims (1)
物を0.3%以上でかつ15%未満含有させてなること
を特徴とする鋳物表面硬化防止用発熱パッド。A heating pad for preventing surface hardening of castings, characterized in that a heating pad powder mixture contains nickel oxide in a weight percentage of 0.3% or more and less than 15%.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63118369A JPH0698457B2 (en) | 1988-05-17 | 1988-05-17 | Heating pad |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63118369A JPH0698457B2 (en) | 1988-05-17 | 1988-05-17 | Heating pad |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01289539A true JPH01289539A (en) | 1989-11-21 |
JPH0698457B2 JPH0698457B2 (en) | 1994-12-07 |
Family
ID=14734998
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63118369A Expired - Lifetime JPH0698457B2 (en) | 1988-05-17 | 1988-05-17 | Heating pad |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0698457B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104084542B (en) * | 2014-06-26 | 2016-03-30 | 浙江锦诚耐火材料有限公司 | A kind of carbon-free heat preservation agent |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58163567A (en) * | 1982-03-24 | 1983-09-28 | Mitsubishi Heavy Ind Ltd | Exothermic pad for casting |
-
1988
- 1988-05-17 JP JP63118369A patent/JPH0698457B2/en not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58163567A (en) * | 1982-03-24 | 1983-09-28 | Mitsubishi Heavy Ind Ltd | Exothermic pad for casting |
Also Published As
Publication number | Publication date |
---|---|
JPH0698457B2 (en) | 1994-12-07 |
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