JPH0461730B2 - - Google Patents
Info
- Publication number
- JPH0461730B2 JPH0461730B2 JP62035860A JP3586087A JPH0461730B2 JP H0461730 B2 JPH0461730 B2 JP H0461730B2 JP 62035860 A JP62035860 A JP 62035860A JP 3586087 A JP3586087 A JP 3586087A JP H0461730 B2 JPH0461730 B2 JP H0461730B2
- Authority
- JP
- Japan
- Prior art keywords
- epoxy resin
- parts
- weight
- layer
- resin
- 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 - Lifetime
Links
- 239000003822 epoxy resin Substances 0.000 claims description 30
- 229920000647 polyepoxide Polymers 0.000 claims description 30
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 26
- 239000010410 layer Substances 0.000 claims description 22
- 239000002344 surface layer Substances 0.000 claims description 17
- 229910052580 B4C Inorganic materials 0.000 claims description 15
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 14
- 239000012783 reinforcing fiber Substances 0.000 claims description 14
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims description 13
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 13
- 229920005989 resin Polymers 0.000 claims description 12
- 239000011347 resin Substances 0.000 claims description 12
- 239000011162 core material Substances 0.000 claims description 11
- 239000000835 fiber Substances 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 4
- 229920006231 aramid fiber Polymers 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000000465 moulding Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000000654 additive Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 239000004034 viscosity adjusting agent Substances 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- OWYWGLHRNBIFJP-UHFFFAOYSA-N Ipazine Chemical compound CCN(CC)C1=NC(Cl)=NC(NC(C)C)=N1 OWYWGLHRNBIFJP-UHFFFAOYSA-N 0.000 description 1
- 229920000271 Kevlar® Polymers 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000004761 kevlar Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 239000006082 mold release agent Substances 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
Landscapes
- Mounting, Exchange, And Manufacturing Of Dies (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Description
（産業上の利用分野）
本発明は、鋼板のプレス成形等に用いる樹脂製
パンチに関する。
（従来の技術）
従来、この種パンチとして、特公昭44−15543
号公報により、パンチコアの表面に、エポキシ樹
脂の注型層を形成すると共に、該注型層の上にス
チールフアイバーを含有するエポキシ樹脂ゲルコ
ート層を形成したものは知られている。
（発明が解決しようとする問題点）
上記パンチは、表面は硬質であるものの、スチ
ールフアイバーとエポキシ樹脂との親和性やブラ
ンクに対する滑り性が悪いため、アール部等の成
形荷重が高くなる部分の摩耗を生じ易く、又成形
精度が悪くなり易い問題がある。
本発明は、かかる問題点を解決し、耐摩耗性に
優れ、且つパンチ製造時の作業性に優れたエポキ
シ樹脂製のパンチを提供することをその目的とす
る。
（問題点を解決するための手段）
本発明は、上記目的を達成すべく、芯材の表面
に、エポキシ樹脂の注型層と、該注型層の上にエ
ポキシ樹脂を含浸させた補強繊維層とを形成する
と共に、該繊維層の上にエポキシ樹脂100重量部
に対しボロンカーバイド粉を10〜20重量部、二硫
化モリブデンを５〜10重量部含む表面層を形成し
たことを特徴とする。
また、本願第２発明は、前記表面層を前記加物
に添加えて酸化鉄を５〜10重量部含むものに形成
したことを特徴とする。
（作 用）
表面層に混入されるボロンカーバイド粉は、硬
質で且つエポキシ樹脂に対する親和性が良いた
め、耐摩耗性が向上する。ボロンカーバイド粉の
混入量を10〜20重量部とするのは、それ以下では
耐摩耗性が向上せず、又それ以上では過剰のボロ
ンカーバイド粉が表面層の表面に出て、ブランク
に傷が付き易くなるためである。又、二硫化モリ
ブデンを混入することで表面層に潤滑性が付互さ
れ、ブランクに対する滑り性が高められて耐摩耗
性や成形精度が向上する。然し、二硫化モリブデ
ンの混入量を増すと表面層の耐圧強度が低下する
ため、混入量は５〜10重量部とする。ところで、
本発明パンチの製造に際しては、製品モデルに表
面層を形成するボロンカーバイド粉等の添加物を
混入したエポキシ樹脂を塗布し、その上にエポキ
シ樹脂を含浸させた補強繊維を積層した後、芯材
をセツトしてエポキシ樹脂を注型するもので、製
品モデルへのエポキシ樹脂の塗布に際し、これに
上記添加物に加え粘度調整剤を混入して粘度を高
め、樹脂が垂れ流れないようにして塗布作業性を
向上させることが望まれる。
ここで、エポキシ樹脂の粘度調整剤としては一
般的に炭酸カルシウム、シリカ、クレーが用いら
れるが、これらの調整剤では表面層の耐圧強度が
低下する。これに対し、本願第２発明の如く酸化
鉄を用いれば耐圧強度の下を抑制できる。然し、
酸化鉄を用いてもその混入量を増すと耐圧強度を
確保できなくなるため、混入量は５〜10重量部と
する。
以上の構成により、耐摩耗性に優れ且つ耐圧強
度も充分な表面層が得られ、而も補強繊維層によ
り表面層がバツクアツプされて、耐衝撃性も向上
し、従来の樹脂パンチに比し耐久性が大巾に向上
する。
（実施例）
第１図を参照して、１は鋳鉄製の芯材を示し、
該芯材１の表面にエポキシ樹脂の注型層２と、そ
の上にエポキシ樹脂を含浸させた補強繊維層３
と、更にその上にエポキシ樹脂にボロンカーバイ
ド粉と二硫化モリブデンと粘度調整剤として酸化
鉄Fe3O4とを混入した表面層４とを形成した。
その製造方法を第２図を参照して説明するに、
先ず製品モデル５の表面に、離型剤を塗布した
後、ボロンカーバイド粉、二硫化モリブデン、酸
化鉄を混入したエポキシ樹脂をハケ等で１〜３mm
程度の厚さに塗布し、次いでその上にエポキシ樹
脂を含浸させた補強繊維布を着した後、表面に接
着剤を塗布した芯材１を製品モデル５の上に所定
の間隙を存してセツトし、次いで芯材１と製品モ
デル５との間の空隙の周囲に石膏等の目止め６を
施して、該空隙にエポキシ樹脂を芯材１に取付け
た注入パイプ７を介して注入し、硬化後製品モデ
ル５を離型する。図面で８はエア抜き孔を示す。
エポキシ樹脂としては、日本チバガイギー社製
のXN1215を用い、又補強繊維布としてはケブラ
ー繊維（デユポン社登録商標）として知られるア
ラミツド繊維布を用いた。尚、補強繊維として
は、他に炭素繊維、ガラス繊維、スチール繊維が
考えられるが、炭素繊維は強度は有るものの、形
状なじみ性が悪く、製品モデル５に貼着したとき
アール部等で浮き易く、又ガラス繊維やスチール
繊維は強度が不充分で作業性も悪いため好ましく
ない。これに対し、アラミツド繊維は、引張り強
度が高く、形状なじみ性も良い上に含浸し易いと
いう特性があり、補強繊維として最適である。
又、アール部分等のプレス成形時に高荷重のかか
る部分には補強繊維布を複数枚積層する。
表面層４に混入するボロンカーバイド粉は、エ
ポキシ樹脂への分散性とブランクの傷付きを考慮
してその粒度を400番以上とする。
ここで、ボロンカーバイド粉は表面層の硬度を
高めて耐摩性を向上し、又二硫化モリブデンは表
面層の潤滑性即ちブランクに対する滑り性を高め
て、耐摩耗性と更に成形精度を向上べく機能し、
又酸化鉄は、エポキシ樹脂の粘度を高めて製品モ
デルに塗布する樹脂の垂れ流れを防止し、塗布作
業性を向上すべく機能する。
次にボロンカーバイド粉、二硫化モリブデン、
酸化鉄の夫々の混入量を変化させた場合の耐圧強
度と耐摩耗性の試験結果について説明する。
試験片の組成と耐圧強度は下表に示す通りであ
る。
(Industrial Application Field) The present invention relates to a resin punch used for press forming of steel plates, etc. (Prior art) Conventionally, as this type of punch, the
It is known from Japanese Patent Application Publication No. 2003-11102 that a cast layer of epoxy resin is formed on the surface of a punch core, and an epoxy resin gel coat layer containing steel fibers is formed on the cast layer. (Problems to be Solved by the Invention) Although the above punch has a hard surface, it has poor affinity between the steel fiber and epoxy resin and poor slipperiness against the blank. There are problems in that wear tends to occur and molding accuracy tends to deteriorate. An object of the present invention is to solve these problems and provide an epoxy resin punch that has excellent wear resistance and excellent workability during punch manufacturing. (Means for Solving the Problems) In order to achieve the above object, the present invention includes a cast layer of epoxy resin on the surface of a core material, and a reinforcing fiber impregnated with epoxy resin on the cast layer. A surface layer containing 10 to 20 parts by weight of boron carbide powder and 5 to 10 parts by weight of molybdenum disulfide per 100 parts by weight of epoxy resin is formed on the fiber layer. . Further, the second invention of the present application is characterized in that the surface layer is formed by adding 5 to 10 parts by weight of iron oxide to the additive. (Function) Since the boron carbide powder mixed in the surface layer is hard and has good affinity for epoxy resin, wear resistance is improved. The reason why the amount of boron carbide powder mixed is 10 to 20 parts by weight is that if it is less than that, the wear resistance will not improve, and if it is more than that, excess boron carbide powder will come out to the surface of the surface layer and cause scratches on the blank. This is because it becomes easier to attach. In addition, by mixing molybdenum disulfide, the surface layer has lubricity, which increases the slipperiness against the blank and improves wear resistance and molding accuracy. However, as the amount of molybdenum disulfide mixed in increases, the pressure resistance of the surface layer decreases, so the amount mixed is set at 5 to 10 parts by weight. by the way,
When manufacturing the punch of the present invention, epoxy resin mixed with additives such as boron carbide powder to form the surface layer is applied to the product model, reinforcing fibers impregnated with epoxy resin are laminated on top of the epoxy resin, and then the core material is When applying the epoxy resin to the product model, in addition to the above additives, a viscosity modifier is mixed in to increase the viscosity and the resin is applied without dripping. It is desired to improve workability. Here, calcium carbonate, silica, and clay are generally used as viscosity modifiers for epoxy resins, but these modifiers reduce the pressure resistance of the surface layer. On the other hand, if iron oxide is used as in the second invention of the present application, the decrease in compressive strength can be suppressed. However,
Even if iron oxide is used, if the amount of iron oxide is increased, the compressive strength cannot be ensured, so the amount of iron oxide is set at 5 to 10 parts by weight. With the above structure, a surface layer with excellent abrasion resistance and sufficient pressure resistance can be obtained, and the surface layer is backed up by the reinforcing fiber layer, which improves impact resistance and is more durable than conventional resin punches. Sexuality is greatly improved. (Example) Referring to FIG. 1, 1 indicates a core material made of cast iron,
A cast layer 2 of epoxy resin is formed on the surface of the core material 1, and a reinforcing fiber layer 3 impregnated with epoxy resin is formed thereon.
Further, a surface layer 4 was formed thereon by mixing an epoxy resin with boron carbide powder, molybdenum disulfide, and iron oxide Fe 3 O 4 as a viscosity modifier. The manufacturing method will be explained with reference to FIG.
First, a mold release agent is applied to the surface of product model 5, and then 1 to 3 mm of epoxy resin mixed with boron carbide powder, molybdenum disulfide, and iron oxide is applied with a brush.
After applying a reinforcing fiber cloth impregnated with epoxy resin on top of it, the core material 1 whose surface is coated with adhesive is placed on top of the product model 5 with a predetermined gap. Then, a filler 6 such as plaster is applied around the gap between the core material 1 and the product model 5, and epoxy resin is injected into the gap through the injection pipe 7 attached to the core material 1. After curing, the product model 5 is released from the mold. In the drawing, 8 indicates an air vent hole. As the epoxy resin, XN1215 manufactured by Ciba Geigy, Japan was used, and as the reinforcing fiber cloth, an aramid fiber cloth known as Kevlar fiber (registered trademark of DuPont) was used. Other reinforcing fibers that can be used are carbon fiber, glass fiber, and steel fiber, but although carbon fiber has strength, it has poor shape conformability and tends to float around the rounded part when attached to product model 5. Furthermore, glass fibers and steel fibers are not preferred because they have insufficient strength and workability. On the other hand, aramid fibers have the characteristics of high tensile strength, good shape conformability, and easy impregnation, making them ideal as reinforcing fibers.
In addition, a plurality of reinforcing fiber cloths are laminated in areas that are subject to high loads during press molding, such as rounded areas. The particle size of the boron carbide powder mixed in the surface layer 4 is set to be No. 400 or more in consideration of dispersibility in the epoxy resin and damage to the blank. Here, boron carbide powder increases the hardness of the surface layer and improves wear resistance, and molybdenum disulfide increases the lubricity of the surface layer, that is, the slipperiness against the blank, and functions to improve wear resistance and molding accuracy. death,
Iron oxide also functions to increase the viscosity of the epoxy resin, prevent the resin applied to the product model from dripping, and improve coating workability. Next, boron carbide powder, molybdenum disulfide,
The test results of compressive strength and wear resistance when varying the amount of iron oxide mixed in each are explained. The composition and compressive strength of the test piece are shown in the table below.
【表】
上記表から、二硫化モリブデンや酸化鉄の混入
量増すと、耐圧強度が低下するのが分る。
第３図は、上記〜の試験片を用い、荷重１
Kg／mm、44シヨツト／分の条件で耐摩耗性試験を
行つたときの摩耗量を示し、同図から明らかなよ
うにボロンカーバイド粉を10〜20重量部混入する
ことで耐摩耗性が著しく向上し、更に二硫化モリ
ブデンのみならず酸化鉄の混入も耐摩耗性の向上
に役立つことが分る。
一般に、自動車車体用の鋼板のプレス成形には
7.5Kg／mm2以上の耐圧強度が必要で、且つ摩耗量
も10万シヨツトで0.2mm以下であることが必要と
されており、この条件を満すのはの試験
片である。然し、は製品モデル５への樹脂塗布
時に樹脂が垂れ流れ易く、又はブランクに対し
ての滑り性が悪くブランクがパンチでこじられて
成形精度が出ないため、ボロンカーバイド粉を10
〜20重量部、二硫化モリブデンと酸化鉄とを夫々
５〜10重量部としたのもののみが合格品とな
る。
尚、ボロンカーバイドに代えてカーボンチヨツ
プを用いることも考られるが、カーボンチヨツプ
はエポキシ樹脂との親和性が悪く、耐摩耗性は向
上しない。第３図にとしてカーボンチヨツプを
20重量部混入した場合の試験結果を示した。
（発明の効果）
以上の如く本発明によるときは、耐摩耗性、耐
衝撃性に優れ、且つ耐圧強度も充分で高精度のプ
レス成を行い得られ、而も樹脂製パンチの特徴で
ある製造作業の容易性も損わず、安価で高性能の
パンチを得られる効果を有する。[Table] From the above table, it can be seen that as the amount of molybdenum disulfide and iron oxide added increases, the compressive strength decreases. Figure 3 shows the results using the above test specimens with a load of 1
This figure shows the amount of wear when a wear resistance test was conducted under the conditions of Kg/mm and 44 shots/min, and as is clear from the figure, the wear resistance was significantly improved by mixing 10 to 20 parts by weight of boron carbide powder. Furthermore, it can be seen that the addition of not only molybdenum disulfide but also iron oxide is useful for improving wear resistance. Generally, press forming of steel plates for automobile bodies involves
It is necessary to have a pressure resistance of 7.5 kg/mm 2 or more, and the amount of wear must be 0.2 mm or less after 100,000 shots, and the test piece satisfies these conditions. However, when applying resin to product model 5, the resin easily drips and flows, or the blank has poor slipperiness and is twisted by punches, resulting in poor molding accuracy.
-20 parts by weight, and only those containing 5 to 10 parts by weight of molybdenum disulfide and iron oxide are acceptable. Although it is possible to use carbon chops instead of boron carbide, carbon chops have poor affinity with epoxy resins and do not improve wear resistance. Figure 3 shows the carbon tip.
The test results when 20 parts by weight were mixed are shown. (Effects of the Invention) As described above, according to the present invention, it is possible to perform press forming with high precision, which has excellent abrasion resistance and impact resistance, and sufficient pressure resistance, and which is a characteristic of resin punches. It has the effect of obtaining a high-performance punch at an inexpensive price without compromising ease of work.
第１図は本発明パンチの要部の拡大断面図、第
２図はパンチの製造方法を示す断面図、第３図は
耐摩耗試験の結果を示す線図である。
１……芯材、２……注型層、３……補強繊維
層、４……表面層。
FIG. 1 is an enlarged cross-sectional view of the main parts of the punch of the present invention, FIG. 2 is a cross-sectional view showing a method for manufacturing the punch, and FIG. 3 is a diagram showing the results of a wear resistance test. 1... Core material, 2... Casting layer, 3... Reinforcing fiber layer, 4... Surface layer.
Claims (1)
注型層の上にエポキシ樹脂を含浸させた補強繊維
層とを形成すると共に、該繊維層の上にエポキシ
樹脂100重量部に対しボロンカーバイド粉を10〜
20重量部、二硫化モリブデンを５〜10重量部含む
表面層を形成したことを特徴とする樹脂製パン
チ。 ２ ボロンカーバイド粉の粒度を400番以上とし
て成る特許請求の範囲第１項記載の樹脂製パン
チ。 ３ 補強繊維層をエポキシ樹脂を含浸させたアラ
ミツド繊維布で形成して成る特許請求の範囲第１
項又は第２項に記載の樹脂製パンチ。 ４ 芯材の表面に、エポキシ樹脂の注型層と、該
注型層の上にエポキシ樹脂を含浸させた補強繊維
層とを形成すると共に、該繊維層の上にエポキシ
樹脂100重量部に対しボロンカーバイド粉を10〜
20重量部、二硫化モリブデンを５〜10重量部、酸
化鉄を５〜10重量部含む表面層を形成したことを
特徴とする樹脂製パンチ。[Claims] 1. On the surface of the core material, a cast layer of epoxy resin and a reinforcing fiber layer impregnated with epoxy resin are formed on the cast layer, and an epoxy resin layer is formed on the fiber layer. 10 to 10 parts of boron carbide powder per 100 parts by weight of resin
A resin punch comprising a surface layer containing 20 parts by weight of molybdenum disulfide and 5 to 10 parts by weight of molybdenum disulfide. 2. A resin punch according to claim 1, comprising boron carbide powder having a particle size of 400 or more. 3. Claim 1 in which the reinforcing fiber layer is formed of an aramid fiber cloth impregnated with epoxy resin
The resin punch according to item 1 or 2. 4. On the surface of the core material, a cast layer of epoxy resin and a reinforcing fiber layer impregnated with epoxy resin are formed on the cast layer, and a reinforcing fiber layer is formed on the fiber layer based on 100 parts by weight of the epoxy resin. Boron carbide powder 10~
20 parts by weight of a resin punch, comprising a surface layer containing 20 parts by weight, 5 to 10 parts by weight of molybdenum disulfide, and 5 to 10 parts by weight of iron oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62035860A JPS63207426A (en) | 1987-02-20 | 1987-02-20 | Resin made punch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62035860A JPS63207426A (en) | 1987-02-20 | 1987-02-20 | Resin made punch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63207426A JPS63207426A (en) | 1988-08-26 |
| JPH0461730B2 true JPH0461730B2 (en) | 1992-10-01 |
Family
ID=12453736
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62035860A Granted JPS63207426A (en) | 1987-02-20 | 1987-02-20 | Resin made punch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63207426A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109867913A (en) * | 2018-08-11 | 2019-06-11 | 珠海市磐石电子科技有限公司 | Wear-resisting prepreg and wearing layer |
| CN109702098A (en) * | 2018-12-21 | 2019-05-03 | 广西艾盛创制科技有限公司 | A kind of mould manufacturing method of skeleton glass reinforced plastic punch forming aluminum alloy part |
| JP7207276B2 (en) * | 2019-11-20 | 2023-01-18 | Ｊｆｅスチール株式会社 | press mold |
-
1987
- 1987-02-20 JP JP62035860A patent/JPS63207426A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63207426A (en) | 1988-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |