JPH0344121B2 - - Google Patents
Info
- Publication number
- JPH0344121B2 JPH0344121B2 JP31459887A JP31459887A JPH0344121B2 JP H0344121 B2 JPH0344121 B2 JP H0344121B2 JP 31459887 A JP31459887 A JP 31459887A JP 31459887 A JP31459887 A JP 31459887A JP H0344121 B2 JPH0344121 B2 JP H0344121B2
- Authority
- JP
- Japan
- Prior art keywords
- hole
- die
- pin
- twisted
- angle
- 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
- 239000000463 material Substances 0.000 claims description 28
- 238000001125 extrusion Methods 0.000 claims description 22
- 239000013067 intermediate product Substances 0.000 claims description 18
- 239000000047 product Substances 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 238000000465 moulding Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000005489 elastic deformation Effects 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 229910000997 High-speed steel Inorganic materials 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/14—Making other products
- B21C23/147—Making drill blanks
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Powder Metallurgy (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、ねじれ孔を有する未焼結のドリル
中間品を効率良く、高精度に成形することのでき
る押出し成形装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an extrusion molding device that can efficiently and precisely mold an unsintered drill intermediate product having a twisted hole.
ねじれ孔付きドリルを製造する場合、ストレー
ト孔をつけたブランクを熱間でねじつてオイルホ
ールとなる孔にねじれを付与するなどの手法もあ
るが、バインダーを含む硬質合金の粉末材料を押
出し成形し、この工程でねじりを付与する方が生
産性に優れる。
When manufacturing a drill with a twisted hole, there are methods such as hot twisting a blank with a straight hole to give a twist to the hole that will become the oil hole, but it is also possible to make a drill by extruding a hard metal powder material containing a binder. , it is more productive to add twist in this process.
また、同じ押出し成形法による場合も、押出し
中に材料にねじりを加えると、ダイス通過後にね
じりを加える場合に必要なねじり装置が要らず、
孔のねじれ角も安定する。 In addition, even when using the same extrusion method, if the material is twisted during extrusion, the twisting device required when twisting the material after passing through the die is not required.
The torsion angle of the hole is also stabilized.
このような押出し成形装置としては、特公昭62
−107908号に開示されるものがある。 As such an extrusion molding device, the
- There is something disclosed in No. 107908.
上記の公報に示される装置、即ち、押出しプレ
ス工具は、ノズル（ダイス）内面に設けた螺旋状
のウエブ又は溝による案内効果を利用して押出し
中の材料にねじりを与える。また、ノズル内に臨
ませた弾性ピンを、回転しながらノズルの出口に
向かう材料の流動圧によつて上記ウエブ又は溝に
平行に沿うように弾性変形させ、この状態をプレ
ス工程中に継続保持して押出し材料中にピンで形
付けしたねじれ孔を付す。
The device disclosed in the above-mentioned publication, ie, the extrusion press tool, uses the guiding effect of a spiral web or groove provided on the inner surface of a nozzle (die) to impart twist to the material being extruded. In addition, an elastic pin facing inside the nozzle is elastically deformed parallel to the web or groove by the flowing pressure of the material toward the outlet of the nozzle while rotating, and this state is continuously maintained during the pressing process. to create a pin-shaped twisted hole in the extruded material.
ところが、かゝる装置では、得られるねじれ孔
の位置精度、形状精度、ピツチ、平行度が狂い易
く、そのために、ドリルの強度、性能がバラツク
と云う問題があつた。 However, with such a device, the positional accuracy, shape accuracy, pitch, and parallelism of the resulting twisted hole are likely to be out of order, resulting in a problem that the strength and performance of the drill vary.
その原因は、押出し工程で材料のねじりを与え
る装置では、材料の各部に作用する押出し圧のバ
ラツキ傾向がより強まるのに対し、上述の装置で
は孔の成形型として弾性ピンを用いていることに
あると推測される。即ち、押出し圧のバラツキの
ために、弾性ピンが定点に安定に保持されず、押
出し中に動くことが上述の問題につながつている
と考えられる。 The reason for this is that in devices that twist the material during the extrusion process, the extrusion pressure acting on each part of the material tends to vary more, whereas in the above-mentioned device, elastic pins are used as the molds for the holes. It is assumed that there is. That is, it is thought that due to variations in extrusion pressure, the elastic pins are not stably held at a fixed point and move during extrusion, leading to the above-mentioned problem.
この発明の目的は、かゝる問題点を無くすと同
時にドリル中間品の成形効果も更に高めることに
ある。 An object of the present invention is to eliminate such problems and at the same time further enhance the forming effect of the drill intermediate product.
〔問題点を解決するための手段〕
この発明の押出し成形装置は、アプローチ部に
続くストレート部の穴が正多角形を原形として該
原形の各コーナーに丸味をつけた断面形状をな
し、かつ、その穴はリード角を有して終端に至る
間に90゜以上回転しているダイスと、ピン支持部
を避けた位置に押出し材料の通過孔を有するフラ
ンジと、ダイスの入口部に配置する上記フランジ
に根本端を固定し、そこから上記ストレート部の
始端近くに至る部分は径を太くして補強し、さら
にこの大径部からダイスの出口又はその近くに置
く先端まではダイスの軸心から一定の距離を保つ
て上記穴のねじれ方向と同一方向に螺旋状にねじ
れているねじれ孔成形用のピンとを具備し、上記
穴のリード角、ピンのねじれ角はダイスの出口に
向かつて徐々に増加し、かつ、ピンのねじれ角は
押出し圧によるねじれを見込んで穴のリード角よ
りも小さくしてあることを特徴とするものであ
る。[Means for Solving the Problems] In the extrusion molding apparatus of the present invention, the hole in the straight portion following the approach portion has a cross-sectional shape of a regular polygon as an original shape with each corner of the original shape being rounded, and A die whose hole has a lead angle and is rotated by more than 90 degrees while reaching the end, a flange having a passage hole for the extruded material at a position avoiding the pin support, and the above-mentioned die which is located at the entrance of the die. The base end is fixed to the flange, and the part from there to near the starting end of the straight part is reinforced by increasing the diameter, and from this large diameter part to the exit of the die or the tip placed near it, the distance is from the axis of the die. It is equipped with a pin for forming a twisted hole that is twisted spirally in the same direction as the twisting direction of the hole while maintaining a certain distance, and the lead angle of the hole and the twisting angle of the pin are gradually adjusted toward the exit of the die. In addition, the twist angle of the pin is smaller than the lead angle of the hole in anticipation of twisting due to extrusion pressure.
なお、押出し成形には、材料を押出すポンチ等
が必要であるが、上述のダイス、フランジ、ねじ
れ孔成形用ピンを除く装置の他の構成要素は、周
知の押出し成形装置と同じものを用いればよい。 Note that extrusion molding requires a punch to extrude the material, but the other components of the device except for the die, flange, and twisted hole forming pin mentioned above are the same as those of well-known extrusion molding equipment. Bye.
ピンの変位は根本側では僅かでも、先端側では
拡大されて大きくなる。従つて、ねじれ孔の位置
精度、形状精度、平行度を高めるには根本側の変
位量を小さくすることが重要である。
Even if the displacement of the pin is slight on the root side, it becomes larger and larger on the tip side. Therefore, in order to improve the positional accuracy, shape accuracy, and parallelism of the twisted hole, it is important to reduce the amount of displacement on the root side.
この発明の装置には、その要求を満たす工夫が
なされている。即ち、ダイスのストレート部と同
一方向にねじれたピンは、変位の原因となる材料
の回転方向への流動圧を受け難い。 The device of the present invention has been devised to meet this requirement. That is, a pin twisted in the same direction as the straight portion of the die is less susceptible to flow pressure in the direction of rotation of the material, which causes displacement.
また、成形に影響のないアプローチ部でピンを
補強すれば、変位支点が先端に近づくため変位量
の拡大率が小さくなる。 Furthermore, if the pin is reinforced at the approach portion that does not affect molding, the displacement fulcrum will move closer to the tip, and the magnification of the displacement will be smaller.
さらに、ダイスストレート部の穴のリード角を
始端側で弱めれば、ねじれ方向への材料流動圧が
穴の始端側ほど弱くなり、そのため、ピンに加わ
る変位方向の応力も穴の始端側ほど弱くなる。 Furthermore, if the lead angle of the hole in the straight part of the die is weakened at the starting end, the material flow pressure in the torsional direction becomes weaker toward the starting end of the hole, and therefore the stress applied to the pin in the displacement direction is also weaker toward the starting end of the hole. Become.
これ等の相乗効果でピンの定置状態は非常に良
くなるが、押出し中に積極的に弾性変形させない
本願のピンであつても、それ自体が細いため、若
干の弾性変形による変位は避けられない。ピンの
ねじれ角を穴のリード角よりも小さくしたのは、
この弾性変形量を吸収する目的からであり、以上
の工夫によつてピンは、成形中、所定の成形点に
安定に保持される。 These synergistic effects make the pin in a very good position, but even with the pin of the present invention, which is not actively elastically deformed during extrusion, some displacement due to elastic deformation is unavoidable because it is thin itself. . The reason why the helix angle of the pin is smaller than the lead angle of the hole is because
This is for the purpose of absorbing this amount of elastic deformation, and with the above measures, the pin is stably held at a predetermined molding point during molding.
なお、穴のリード角が上述のように変化してい
ると、穴の始端側ほど材料に強い押出し圧がかゝ
るので、リード角が一定の穴に比べて材料の圧縮
状態が良くなり、従つて、中間品の成形効果もよ
り一層向上する。 Furthermore, if the lead angle of the hole changes as described above, stronger extrusion pressure will be applied to the material closer to the starting end of the hole, so the compression state of the material will be better compared to a hole with a constant lead angle. Therefore, the molding effect of the intermediate product is further improved.
添付図に、この発明の装置の一例を示す。図の
１はダイス、２はピン保持用のフランジ、３はね
じれ孔の成形型となるピンである。
An example of the apparatus of the present invention is shown in the accompanying drawing. In the figure, 1 is a die, 2 is a flange for holding the pin, and 3 is a pin that serves as a mold for forming a twisted hole.
ダイス１は、アプローチ部４に続くストレート
部５を有する。そのストレート部の穴６は、断面
が正多角形を原形とし、成形品に対するクラツク
の発生を防止するためにその原形の各コーナーに
適当なアール半径の丸味をつけた角穴であり、し
かも、その穴は始端から終端に至る間に90゜以上
回転している。但し穴のリード角は長手方向に均
一ではなく、終端（出口）に行くに従つて徐々に
角度を強め、終端の角度で中間品のねじれ角を決
定するようにしてある。なお、アプローチ部４の
面の傾斜角αは10〜40゜が適当である。10゜未満で
はダイス長さが長くなるため装置構成上不利にな
る。一方、41゜以上では押出し材料に充分に圧力
がかゝらず、中間品の品質が不安定になり易い。 The die 1 has a straight part 5 following an approach part 4. The hole 6 in the straight part is a square hole whose cross section is a regular polygon, and each corner of the original shape is rounded with an appropriate radius to prevent the occurrence of cracks in the molded product. The hole rotates more than 90 degrees from the beginning to the end. However, the lead angle of the hole is not uniform in the longitudinal direction, but gradually increases toward the end (exit), and the angle at the end determines the twist angle of the intermediate product. Note that the angle of inclination α of the surface of the approach portion 4 is suitably 10 to 40 degrees. If it is less than 10°, the length of the die becomes long, which is disadvantageous in terms of device configuration. On the other hand, if the angle is greater than 41°, sufficient pressure will not be applied to the extruded material, and the quality of the intermediate product will likely become unstable.
フランジ２は、ダイス１の入口部の内外径に合
わせたリング状部７の中央に橋をかけてこの橋を
ピン支持部８、その両側を材料通過孔９としたも
ので、第１図に示すように、ダイス１の入口に同
軸的に配置される。 The flange 2 has a bridge at the center of a ring-shaped part 7 that matches the inner and outer diameters of the entrance part of the die 1, and this bridge is a pin support part 8, and material passage holes 9 are formed on both sides of the bridge, as shown in Fig. 1. As shown, it is arranged coaxially at the inlet of the die 1.
また、フランジ２で根本端を支持してダイス１
の穴内に臨ませるピン３は、根本側に、長さl1の
大径部１０を有する。この大径部１０は、ピンの
変形を少なくするための補強部として機能させる
ので、材料の流れを悪化させない範囲で極力径を
太くするのが望ましい。また、図のように、先端
側１１との間に段差を生じる場合には、l1をアプ
ローチ部長さl2よりも短かくするが、その大径部
を先細テーパに形成する場合には、穴６内に若干
進入する長さにしても問題はなく、補強部をより
長くしてねじれ孔の径、ピツチをより安定させる
ことが可能である。先端側１１は、中間品に付す
ねじれ孔と同一径であり、かつ、断面は円形であ
る。また、その先端側１１はダイスの中心から所
定距離を保つて穴６と同一方向にねじれている。
そのねじれ角は穴６と同様、ダイスの出口が徐々
に強まつているが、ねじれ角自体は穴６のリード
角よりも小さい。これは前述の不可避な弾性変形
量を吸収するためで、穴のリード角との角度差
は、変形後のピンが、定点にくるようにリード角
の大きさ、材料の粘度、押出し圧、中間品の径等
を考えて適宜に決定される。 Also, support the base end with flange 2 and insert die 1.
The pin 3 facing into the hole has a large diameter portion 10 with a length l 1 on the base side. Since the large diameter portion 10 functions as a reinforcing portion to reduce deformation of the pin, it is desirable to make the diameter as large as possible without impairing the flow of the material. In addition, as shown in the figure, when a step is created between the distal end side 11, l 1 is made shorter than the approach section length l 2 , but when the large diameter section is formed into a tapered shape, There is no problem even if the reinforcing portion is made long enough to enter the hole 6 slightly, and it is possible to make the diameter and pitch of the twisted hole more stable by making the reinforcing portion longer. The tip side 11 has the same diameter as the twisted hole provided in the intermediate product, and has a circular cross section. Further, the tip side 11 is twisted in the same direction as the hole 6 while maintaining a predetermined distance from the center of the die.
Similar to hole 6, its helix angle gradually becomes stronger at the exit of the die, but the helix angle itself is smaller than the lead angle of hole 6. This is to absorb the above-mentioned unavoidable elastic deformation, and the angle difference from the lead angle of the hole is determined by the size of the lead angle, the viscosity of the material, the extrusion pressure, the intermediate It is determined appropriately by considering the diameter of the product, etc.
ピン３の先端位置は、ダイス出口からの後退量
が大き過ぎるとねじれ孔の寸法、形状がバラツキ
易く、逆に突出量が大き過ぎると材料の押出し抵
抗が強まるので、ダイスの出口とほゞ同位置、又
は、そこからいくぶんか前進或いは後端したとこ
ろが好ましい。 The position of the tip of the pin 3 should be approximately the same as the exit of the die, because if the amount of retraction from the die exit is too large, the size and shape of the twisted hole will easily vary, and on the other hand, if the amount of protrusion is too large, the extrusion resistance of the material will be strong. The preferred position is at or somewhat forward or rearward from there.
また、そのピン３の先端面の押出し方向に対す
る垂直度が高いほどねじれ孔の真円度は良くな
る。 Further, the higher the perpendicularity of the tip end surface of the pin 3 to the extrusion direction, the better the circularity of the twisted hole becomes.
このほか、穴６は多角形の角数が多くなるほど
形状が内接円に近似し、中間品からドリルを作る
際の余剰個所（内接円からのはみ出し部）の研削
量が少なくなる。しかし、小径の中間品において
その角数をむやみに増加させると、クラツク防止
に必要なコーナアール半径を確保し得なくなる。
従つて、多角形の角数決定時には、この点を充分
に考慮する必要がある。例えば、内接円径が６mm
の中間品では３〜12角形が適当であつた。 In addition, the shape of the hole 6 becomes more similar to the inscribed circle as the number of corners of the polygon increases, and the amount of grinding of surplus parts (protruding parts from the inscribed circle) when making a drill from an intermediate product is reduced. However, if the number of corners is increased unnecessarily in a small-diameter intermediate product, it becomes impossible to secure the corner radius necessary to prevent cracks.
Therefore, it is necessary to fully consider this point when determining the number of angles of a polygon. For example, the inscribed circle diameter is 6mm
For intermediate products, trigonometric to dodecagonal shapes were suitable.
また、ストレート部５は中間品に所定のねじれ
角を付与するに充分な長さにする必要があるが、
この寸法は同じ６mmの中間品においては20mm以上
が好ましかつた。 In addition, the straight part 5 needs to be long enough to impart a predetermined twist angle to the intermediate product;
This dimension was preferably 20 mm or more for the same 6 mm intermediate product.
さらに、ピン３の先端位置のダイス出口からの
突出量、又は後退量は、ピンの材量に高速度鋼を
用いて先の６mmの中間品を得る場合、10mmが限度
であり、そのピンの大径部１０の太さも、６mmの
中間品では材料の流動性の面で先端側１１の径の
４倍が限度であつた。 Furthermore, the amount of protrusion or retraction of the tip of pin 3 from the die exit is limited to 10 mm when using high-speed steel for the pin material and obtaining an intermediate product with a tip length of 6 mm. In the case of an intermediate product of 6 mm, the thickness of the large diameter portion 10 is limited to four times the diameter of the tip side 11 due to the fluidity of the material.
なお、この発明の装置で成形する中間品の材料
は、所望の合金粉末に油分を含むバインダーを所
定の比率で混合し、これを充分に混練して、適切
な粘度、潤滑性を付与したものを用いる。材料の
粘度、潤滑性が不足すると、これに起因した製品
の品質不良が発生する。 The material of the intermediate product molded by the apparatus of this invention is a mixture of the desired alloy powder and a binder containing oil in a predetermined ratio, and the mixture is thoroughly kneaded to give appropriate viscosity and lubricity. Use. If the viscosity or lubricity of the material is insufficient, product quality defects will occur due to this.
以上のように、この発明の装置は、ダイススト
レート部のリード角、ピンのねじれ角を出口に向
かつて強くし、また、ピンは根本を補強し、さら
に、そのねじれ角を穴のリード角よりも不可避の
変形量を見込んで小さくすることより、材料の流
動圧に起因した材料押出し中のピンの変位、変形
を防止したものであるから、中間品に付されるね
じれ孔の寸法精度、形状精度、ピツチ、平行度が
非常に良くなり、また、中間品全体の成形効果も
高まり、この中間品を使つて得られるねじれ孔付
きドリルの品質安定化、性能向上につながると云
う効果がある。
As described above, the device of the present invention strengthens the lead angle of the straight part of the die and the helix angle of the pin toward the exit, reinforces the base of the pin, and further increases the helix angle from the lead angle of the hole. This prevents displacement and deformation of the pin during material extrusion due to material flow pressure by taking into account the amount of unavoidable deformation and reducing the dimensional accuracy and shape of the twisted hole attached to the intermediate product. Accuracy, pitch, and parallelism are greatly improved, and the overall molding effect of the intermediate product is also enhanced, which has the effect of stabilizing the quality and improving the performance of the twisted hole drill obtained using this intermediate product.
第１図はこの発明の装置の一例を示す断面図、
第２図はダイスのみの断面図、第３図はダイスの
出口側の端面図、第４図はフランジとピンを一体
化して示す斜視図である。
１……ダイス、２……フランジ、３……ピン、
４……アプローチ部、５……ストレート部、６…
…穴、８……ピン支持部、９……材料通過孔、１
０……ピンの大径部、１１……ピンの先端側。
FIG. 1 is a sectional view showing an example of the device of the present invention;
FIG. 2 is a sectional view of only the die, FIG. 3 is an end view of the exit side of the die, and FIG. 4 is a perspective view showing the flange and pin integrated. 1...Dice, 2...Flange, 3...Pin,
4... Approach section, 5... Straight section, 6...
... Hole, 8 ... Pin support part, 9 ... Material passage hole, 1
0... Large diameter portion of the pin, 11... Tip side of the pin.
Claims (1)
し成形して未焼結のねじれ孔付きドリル中間品を
得る装置であつて、アプローチ部に続くストレー
ト部の穴が正多角形を原形として該原形の各コー
ナーに丸味をつけた断面形状をなし、かつ、その
穴はリード角を有して終端に至る間に90゜以上回
転しているダイスと、ピン支持部を避けた位置に
押出し材料の通過孔を有するフランジと、ダイス
の入口部に配置する上記フランジに根本端を固定
し、そこから上記ストレート部の始端近くに至る
部分は径を太くして補強し、さらにこの大径部か
らダイスの出口又はその近くに置く先端まではダ
イスの軸心から一定の距離を保つて上記穴のねじ
れ方向と同一方向に螺旋状にねじれているねじれ
孔成形用のピンとを具備し、上記穴のリード角、
ピンのねじれ角はダイスの出口に向かつて徐々に
増加し、かつ、ピンのねじれ角は押出し圧による
ねじれを見込んで穴のリード角よりも小さくして
あることを特徴とするねじれ孔付きドリル中間品
の押出し成形装置1 An apparatus for obtaining an unsintered drill intermediate product with twisted holes by extrusion molding a hard metal powder material containing a binder, in which the hole in the straight part following the approach part is a regular polygon as the original shape, and each part of the original shape is The die has a cross-sectional shape with rounded corners, and the hole has a lead angle and rotates more than 90 degrees before reaching the end, and a hole for extruded material is placed at a position that avoids the pin support. The base end is fixed to the flange having a flange located at the inlet of the die, and the part from there to near the starting end of the straight part is reinforced by increasing the diameter, and from this large diameter part to the outlet of the die. or a pin for forming a twisted hole which is twisted spirally in the same direction as the twisting direction of the hole while keeping a certain distance from the axis of the die to the tip placed near it, and the lead angle of the hole,
A drill intermediate with a twisted hole, characterized in that the helix angle of the pin gradually increases toward the exit of the die, and the helix angle of the pin is smaller than the lead angle of the hole in anticipation of twisting due to extrusion pressure. Product extrusion molding equipment
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31459887A JPH01156405A (en) | 1987-12-10 | 1987-12-10 | Extruded-forming apparatus for drill intermediate product having twist hole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31459887A JPH01156405A (en) | 1987-12-10 | 1987-12-10 | Extruded-forming apparatus for drill intermediate product having twist hole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01156405A JPH01156405A (en) | 1989-06-20 |
| JPH0344121B2 true JPH0344121B2 (en) | 1991-07-05 |
Family
ID=18055225
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31459887A Granted JPH01156405A (en) | 1987-12-10 | 1987-12-10 | Extruded-forming apparatus for drill intermediate product having twist hole |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01156405A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT400687B (en) * | 1989-12-04 | 1996-02-26 | Plansee Tizit Gmbh | METHOD AND EXTRACTION TOOL FOR PRODUCING A BLANK WITH INNER BORE |
| DE4120165C2 (en) * | 1990-07-05 | 1995-01-26 | Friedrichs Konrad Kg | Extrusion tool for producing a hard metal or ceramic rod |
| JPH05117717A (en) * | 1991-10-25 | 1993-05-14 | Kobe Steel Ltd | Method and device for extruding rod-shaped member having spiral hole |
| US5342189A (en) * | 1992-10-01 | 1994-08-30 | Mitsubishi Aluminum Co., Ltd. | Extrusion dies |
| DE10229326A1 (en) * | 2002-06-29 | 2004-01-29 | Arno Friedrichs | Extrusion tool for producing a cylindrical body made of plastic mass |
| DE10229325B4 (en) | 2002-06-29 | 2005-06-09 | Arno Friedrichs | Extrusion tool for producing a cylindrical body consisting of plastic mass |
-
1987
- 1987-12-10 JP JP31459887A patent/JPH01156405A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01156405A (en) | 1989-06-20 |
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