JPS6234710B2 - - Google Patents
Info
- Publication number
- JPS6234710B2 JPS6234710B2 JP51028175A JP2817576A JPS6234710B2 JP S6234710 B2 JPS6234710 B2 JP S6234710B2 JP 51028175 A JP51028175 A JP 51028175A JP 2817576 A JP2817576 A JP 2817576A JP S6234710 B2 JPS6234710 B2 JP S6234710B2
- Authority
- JP
- Japan
- Prior art keywords
- rolling
- hot rolling
- tool
- rolling tool
- processing
- 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.)
- Expired
Links
- 238000005096 rolling process Methods 0.000 claims description 20
- 238000005098 hot rolling Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 13
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 6
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 6
- 230000003746 surface roughness Effects 0.000 claims description 6
- 238000012545 processing Methods 0.000 description 9
- 238000005452 bending Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 101000803685 Homo sapiens Vacuolar protein sorting-associated protein 4A Proteins 0.000 description 1
- 101000803689 Homo sapiens Vacuolar protein sorting-associated protein 4B Proteins 0.000 description 1
- 102100035085 Vacuolar protein sorting-associated protein 4A Human genes 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 102200082816 rs34868397 Human genes 0.000 description 1
- -1 silicon nitride Chemical class 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Landscapes
- Ceramic Products (AREA)
Description
【発明の詳細な説明】
本発明は転造工具に係り、特に熱間で行なわれ
る転造加工に好適する工具に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rolling tool, and particularly to a tool suitable for hot rolling.
転造加工は、転造工具と素材とを転動させなが
ら転造工具を素材に押しつけ、素材表面層に塑性
変形をおこさせることによつて、これを所要の形
状に成形する加工法である。したがつて転造加工
によれば加工時間がきわめて短く、材料が節減で
き、製品の性質が向上する、などの利点がある。 Rolling is a processing method that presses the rolling tool against the material while rolling the material, causing plastic deformation on the surface layer of the material, thereby forming it into the desired shape. . Therefore, the rolling process has advantages such as extremely short processing time, material savings, and improved product properties.
転造加工のなかでも熱間転造加工は強じん材
料、大形品の加工を可能ならしめ好ましい加工法
である。 Among the rolling processes, hot rolling is a preferable processing method because it enables processing of strong materials and large-sized products.
さて熱間転造加工の場合素材温度は一般には、
900゜〜1000℃程度に加熱される。加熱は通常高
周波誘導加熱で行なわれ、常温から加工温度迄の
昇温は約10秒程度、転造加工は約８秒程度と極め
て短時間に行なわれる。したがつて熱間転造加工
の工具は、強い圧縮力と曲げ力の他に強烈な熱衝
撃を受ける。 In the case of hot rolling, the material temperature is generally
It is heated to about 900° to 1000°C. Heating is usually carried out by high-frequency induction heating, and heating from room temperature to processing temperature takes about 10 seconds, and rolling processing takes about 8 seconds, which is an extremely short time. Therefore, hot rolling tools are subjected to strong compressive force and bending force as well as intense thermal shock.
従来冷間転造工具としては適当な硬度を持ちじ
ん性および耐摩耗性の良好なダイス鋼（SKD１
１，SKD１２等）、高速度鋼（SKH９等）等が多
く用いられており熱間の転造加工工具においても
同様のものが用いられてきた。 Conventional die steel (SKD1) has suitable hardness and good toughness and wear resistance for cold rolling tools.
1, SKD12, etc.), high-speed steel (SKH9, etc.), and similar materials have also been used in hot rolling tools.
しかしながら熱間転造加工においては前述した
ように転造工具は極めて強い熱衝撃を受ける。こ
の点で従来のものでは種々の難点があつた。 However, in hot rolling, the rolling tool is subjected to an extremely strong thermal shock as described above. In this respect, conventional methods have had various difficulties.
すなわち高温で素材に強く押圧される為素材金
属との反応摩耗が起り所定の精度を維持できずそ
の寿命は極めて短かいものであつた。この為得ら
れる製品の精度も不安定でこの点の改良が強く望
まれていたのである。 That is, since it is strongly pressed against the material at high temperatures, reaction wear with the material metal occurs, making it impossible to maintain a predetermined accuracy and resulting in an extremely short service life. For this reason, the accuracy of the resulting product was unstable, and improvements in this respect were strongly desired.
更に従来のもののもう一つの大きな難点は素材
を高周波誘導加熱で加熱する際、工具自体が誘導
され加熱し軟化することである。したがつてこの
現象を防ぐ特別な装置上の工夫が必要であり、こ
の点からも熱間での転造工具の改良が要望されて
いた。 Another major drawback of the conventional method is that when the material is heated by high-frequency induction heating, the tool itself is induced, heated, and softened. Therefore, a special device must be devised to prevent this phenomenon, and from this point of view as well, improvements in hot rolling tools have been desired.
発明者等は各種の耐熱材料を熱間転造工具に適
用すべく実験を重ねた結果、窒化物、特に窒化珪
素が極めて熱間転造工具に好適することを見出し
た。 As a result of repeated experiments to apply various heat-resistant materials to hot rolling tools, the inventors have found that nitrides, particularly silicon nitride, are extremely suitable for hot rolling tools.
すなわち本発明の特徴とするところは、実質的
に窒化珪素からなる焼結体にて熱間転造工具を構
成したことである。しかして発明者等によれば熱
間転造工具に適用する窒化珪素の焼結密度は理論
密度の98％以上が望ましく、また素材と接する表
面粗さは２μ以下が好ましい。 That is, a feature of the present invention is that the hot rolling tool is constructed of a sintered body substantially made of silicon nitride. According to the inventors, the sintered density of silicon nitride used in hot rolling tools is preferably 98% or more of the theoretical density, and the surface roughness in contact with the material is preferably 2 microns or less.
なお、表面粗さと曲げ強度の関係を第１図に示
す。第１図より明らかなように表面粗さが２μ以
下の場合は曲げ強度が大きく、熱間転造時に強い
圧縮力とともにかかる強い曲げ力に対し良好な特
性を示している。 The relationship between surface roughness and bending strength is shown in FIG. As is clear from FIG. 1, when the surface roughness is 2 μm or less, the bending strength is large and exhibits good characteristics against the strong compressive force and strong bending force applied during hot rolling.
実施例
本発明転造工具（焼結密度3.25ｇ／cm3−密度
99.6％）と従来の転造工具（ダイス鋼SKD１１）
とを用い歯車を熱間転造で加工し比較した。Example: Rolling tool of the present invention (sintered density: 3.25 g/cm 3 -density
99.6%) and conventional rolling tool (Die steel SKD11)
A comparison was made by processing gears using hot rolling.
本発明転造工具は、窒化珪素に焼結助剤として
イツトリアを５重量％、アルミナ２重量％添加
し、ホツトプレス（1750℃×2H、300Kg／cm2）し
たものを研削加工で表面粗さ２μに仕上げたもの
である。 The rolling tool of the present invention is made of silicon nitride with 5% by weight of ittria and 2% by weight of alumina added as sintering aids, hot pressed (1750°C x 2H, 300Kg/cm 2 ), and then ground to a surface roughness of 2μ. It was completed in
この際転造工具の評価は、得られる歯車の精度
をJIS4級程度に維持して加工できる製作個数を目
安とした。 At this time, the evaluation of the rolling tool was based on the number of gears that could be manufactured while maintaining the accuracy of the resulting gears at JIS grade 4.
加工した歯車はモジユールｍ＝2.25、歯車Ｚ＝
37、ねじれ角β＝13.5゜、歯幅ｂ＝11mm、材質
S45Cのはすば歯車である。加工に際して予熱は
10秒、加工温度は約1000℃転造は8.5秒段で行な
つた。この結果、本発明転造工具はダイス鋼の工
具にて得られる個数の２倍の個数を加工した後も
得られる歯車の精度はほとんど劣化しない。また
転造工具の表面状態を肉眼で観察したところ、使
用前とほとんど変化していなかつた。 The processed gear has a module m = 2.25 and a gear Z =
37, Helix angle β = 13.5°, Face width b = 11mm, Material
It is an S45C helical gear. Preheating during processing
Rolling was carried out for 8.5 seconds at a processing temperature of approximately 1000°C for 10 seconds. As a result, the accuracy of the gears obtained with the rolling tool of the present invention hardly deteriorates even after machining twice the number of gears than can be obtained with a tool made of die steel. Furthermore, when the surface condition of the rolling tool was visually observed, it was found that there was almost no change from before use.
発明者等は更に歯車以外の機械部品の加工に本
発明転造工具を用いその優れた特性を確認してい
る。 The inventors have also confirmed the excellent properties of the rolling tool of the present invention in the processing of mechanical parts other than gears.
以上述べたように本発明転造工具は熱間転造加
工において従来の転造工具と比較して極めて寿命
が長く優れたものである。更に本発明転造工具は
高周波に誘導されることがなく従来のものと比較
して取扱いが簡便であり工業上の価値は高い。 As described above, the rolling tool of the present invention has an extremely long service life and is superior to conventional rolling tools in hot rolling processing. Furthermore, the rolling tool of the present invention is not induced by high frequency waves, is easier to handle than conventional tools, and has high industrial value.
第１図は窒化珪素焼結体の表面粗さと曲げ強度
の関係である。
FIG. 1 shows the relationship between surface roughness and bending strength of a silicon nitride sintered body.
Claims (1)
結体にて構成され、素材と接する表面粗さが２μ
以下であることを特徴とする熱間転造工具。 ２ 熱間転造は歯車の転造工具である特許請求の
範囲第１項に記載の熱間転造工具。[Claims] 1. Consisting of a sintered body made of silicon nitride with a density of 98% or more, the surface roughness in contact with the material is 2μ.
A hot rolling tool characterized by the following: 2. The hot rolling tool according to claim 1, which is a gear rolling tool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2817576A JPS52111448A (en) | 1976-03-17 | 1976-03-17 | Hot rolling tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2817576A JPS52111448A (en) | 1976-03-17 | 1976-03-17 | Hot rolling tool |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS52111448A JPS52111448A (en) | 1977-09-19 |
| JPS6234710B2 true JPS6234710B2 (en) | 1987-07-28 |
Family
ID=12241381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2817576A Granted JPS52111448A (en) | 1976-03-17 | 1976-03-17 | Hot rolling tool |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS52111448A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61266357A (en) * | 1985-05-17 | 1986-11-26 | 住友電気工業株式会社 | Ceramic tool for worm or hot forging |
| JPH1190835A (en) * | 1997-09-17 | 1999-04-06 | Nippon Seiko Kk | Manufacturing tool for worm wheel made of fiber-reinforced resin |
-
1976
- 1976-03-17 JP JP2817576A patent/JPS52111448A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS52111448A (en) | 1977-09-19 |
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