JPS5868420A - Manufacture of extrusion product - Google Patents

Manufacture of extrusion product

Info

Publication number
JPS5868420A
JPS5868420A JP16811181A JP16811181A JPS5868420A JP S5868420 A JPS5868420 A JP S5868420A JP 16811181 A JP16811181 A JP 16811181A JP 16811181 A JP16811181 A JP 16811181A JP S5868420 A JPS5868420 A JP S5868420A
Authority
JP
Japan
Prior art keywords
punch
blank
die
extruded product
layer
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
Application number
JP16811181A
Other languages
Japanese (ja)
Other versions
JPS599245B2 (en
Inventor
Toru Arai
新井　透
Yoshinari Tsuchiya
能成 土屋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Central R&D Labs Inc
Original Assignee
Toyota Central R&D Labs Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toyota Central R&D Labs Inc filed Critical Toyota Central R&D Labs Inc
Priority to JP16811181A priority Critical patent/JPS599245B2/en
Publication of JPS5868420A publication Critical patent/JPS5868420A/en
Publication of JPS599245B2 publication Critical patent/JPS599245B2/en
Expired legal-status Critical Current

Links

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
    • B21C23/20—Making uncoated products by backward extrusion

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Of Metal (AREA)

Abstract

PURPOSE:To obtain a product having a mirror-like smooth inner surface without causing a seizing, by using a punch having the surface on which a carbide coated layer is formed, in a process of back-piercing extrusion to form a product having a hollow cross section from a metallic cylindrical blank material. CONSTITUTION:A blank material 1 is inserted into a die hole 2 formed with a die 4 and a knockout 10, and then, a carbide coated layer 9 is formed on the surface of the material 1, and a punch 3 having an expanding part at its tip is inserted to work the blank material 1 by a back-piercing extrusion. After that, a formed extruded piece 6 is taken out from the die 4 together with the punch 3 in one body, and at the stage of taking out these things from the hole 2, the piece 6 contacts with a stripper 11 to be removed from the punch 3. Hereupon, the contacting surface between the punch 3 and the material 1 is allowed to be in a non-lubricant state, and the surface of layer 9 is desirable to be made as smooth as a mirror.

Description

【発明の詳細な説明】 本発明は、鏡面のように滑らかな内表面を有する押出品
を後方せん孔押出加工によシ得る押出品の製造方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an extruded article having a mirror-smooth inner surface by back-hole extrusion processing.

鋼、アルミニウム、および銅等の円柱状素材から中空断
面の製品を後方押出加工によシ成形する後方せん孔押出
加工法は、第１図および第２図に示すよう（、素材１（
ブランク）をダイス穴２内に挿入し、前進するポンチ８
で一方向に圧力を加え、ポンチ８とダイス４の隙間５か
ら外へ材料を押出して細長く薄い中空断面の製品６を得
る方法である。この方法では冷間で押出加工を行う際ポ
ンチからブランクに非常に大きな面圧が加えられるので
、ポンチとブランクとの焼付きが生じ、これがこの方法
の大きな難点とされてきた。そこで・従来は、鋼やアル
ミニウムのブランクの、ポンチネ皮 との接触面にリン酸塩厚膜処理を施すなど潤滑性能を向
上せしめて、冷間押出加工時の焼付を防止することが行
われていた。しかし、このようにブランクの・ポンチと
の接触面に一回毎にリン酸塩祉 葵膜処理を施すことは、量産工程においては必ずしも容
易ではなく、又、たとえ潤滑処理を施して押出加工を行
ったとしても被加工面に、リン酸塩梳 茨膜の存在に起因する面粗れが残り、滑らかな表面が得
られない。As shown in Figures 1 and 2, the backward perforation extrusion method involves forming hollow cross-section products from cylindrical materials such as steel, aluminum, and copper by backward extrusion.
Insert the blank) into the die hole 2 and move the punch 8 forward.
In this method, pressure is applied in one direction to extrude the material from the gap 5 between the punch 8 and the die 4 to obtain a product 6 with a long and thin hollow cross section. In this method, when performing cold extrusion processing, a very large surface pressure is applied from the punch to the blank, resulting in seizure between the punch and the blank, which has been considered a major drawback of this method. Therefore, in the past, the lubrication performance of steel or aluminum blanks was improved by applying a thick phosphate film treatment to the contact surface with the pontine skin to prevent seizure during cold extrusion processing. Ta. However, it is not always easy to apply a phosphate film treatment to the contact surface of the blank each time with the punch in the mass production process, and even if extrusion processing is performed with lubrication treatment, Even if this is done, surface roughness due to the presence of the phosphate bramble film remains on the processed surface, making it impossible to obtain a smooth surface.

ホ０ そこで０本発明者らは、パンチとの接触面を無潤滑とし
たブランク（以下、このブランクを無潤滑ブランクとい
う）で後方せん孔押出加工を行っても焼付が生ずること
なく、かつ押出品の内表面が鏡面のように滑らかな押出
加工面を有する押出品を得ることができる製造方法を提
供することを目的として研究を准め１本発明を完成した
ものである。なお、ここで鏡面のように滑らかな面とは
。E0 Therefore, the inventors of the present invention have discovered that even when backward drilling is performed on a blank whose contact surface with the punch is not lubricated (hereinafter, this blank is referred to as a non-lubricated blank), seizure does not occur and the extruded product is The present invention has been completed through research aimed at providing a manufacturing method capable of obtaining an extruded product having a mirror-like smooth inner surface. By the way, what does a mirror-like smooth surface mean?

面粗さがＲｍαｘ−０１μｍ以下のものをいう。The surface roughness is Rmαx−01 μm or less.

すなわち１本発明は１表面に：膨化物被覆層を形成した
ポンチを用いて、ポンチとの接触面を無潤滑としたブラ
ンクに対して冷間で後方せん孔押出加工を行う工程と、
ついで押出品とポンチを一体としてダイスから取り出す
工程と、最後に押出品とポンチとを分離する工程とよシ
なることｔ−特徴とする押出品の製造方法である。That is, 1 the present invention has 1 surface: a step of performing cold backward perforation extrusion on a blank with no lubrication on the contact surface with the punch using a punch on which a swelling material coating layer is formed;
This method of producing an extruded product is characterized by the following steps: a step of taking out the extruded product and the punch as one body from a die; and a step of finally separating the extruded product and the punch.

本発明の押出品の製造方法を適用できるブランクの材質
は、冷間後方せん孔押出加・工が可能とされている％鋼
、アルミニウム、および銅等の金属である。しかし、特
に冷間での後方せん孔押出加工時の焼付の発生が重大な
問題とされている鋼やアルミニウムのブランクに適用す
れば０％に有効である。The materials of the blank to which the method for manufacturing an extruded product of the present invention can be applied are metals such as steel, aluminum, and copper that can be subjected to cold backward perforation extrusion processing. However, it is effective to 0% when applied to steel and aluminum blanks, where seizure during cold extrusion is a serious problem.

第１図に示すブランクの、ポンチとの接触面７は無潤滑
の状憩でよい。しかし、ブランクのダイスとの接触面８
には潤滑処理を施しておけば、ブランクとダイスとの珍
擦力が、ブランクとポンチとの４１−力より小さくなり
・第８図に示すようにポンチの引抜き時に、ブランクが
ポンチと一諸になって上昇する（これをブランクアップ
という）という現象をおこすことができるので好ましい
。The contact surface 7 of the blank shown in FIG. 1 with the punch may be in an unlubricated state. However, the contact surface 8 with the blank die
If the die is lubricated, the friction force between the blank and the die will be smaller than the 41-force between the blank and the punch.As shown in Figure 8, when the punch is pulled out, the blank will not be flush with the punch. This is preferable because it can cause a phenomenon in which the value increases and increases (this is called blank-up).

ポンチの表面には炭化物層被覆層９を設ける。A carbide coating layer 9 is provided on the surface of the punch.

以下、このようにして得られたポンチを炭化物被覆ポン
チという。炭化物層は耐焼付性にすぐれているのみなら
ず、耐摩耗性にもすぐれているので。Hereinafter, the punch thus obtained will be referred to as a carbide-coated punch. The carbide layer not only has excellent seizure resistance, but also has excellent wear resistance.

ポンチの耐焼付性と耐摩耗性を同時に向上せしめること
ができる。なお耐焼付性を向上せしめうる被積層として
は、他に窒化物層、硼化物層、あるいは酸化物層も考え
られるが、実用上の見地からは、炭化物層はどの効果は
ない。炭化物層としては、具体的にはチタン次化物層、
ニオブ屍化物層。The seizure resistance and wear resistance of the punch can be improved at the same time. Note that a nitride layer, a boride layer, or an oxide layer may also be considered as a laminated layer that can improve seizure resistance, but from a practical standpoint, a carbide layer has no effect. Specifically, the carbide layer is a titanium subride layer,
Niobium corpse layer.

バナジウム戻化物層、クロム脚化物層等、一般に炭化物
として存在しうる羨化物層が利用できる。An envy layer that can generally exist as a carbide, such as a vanadium reversion layer or a chromium foot compound layer, can be used.

しかし強いてあげれば鉄を母材とする場合はバナジウム
脚化物層が、又、アルミニウムが母材の場合は、チタン
灰化物層、あるいは、ニオブ炭化物層が耐焼付性のため
に好ましい。膨化物層形成の方法は、一般に使用されて
いる公知の方法でよい。However, if the base material is iron, a vanadium foot compound layer is preferable, and if aluminum is the base material, a titanium ash layer or a niobium carbide layer is preferable for seizure resistance. The method for forming the expanded material layer may be any commonly used known method.

炭化物層の厚さは、５〜１０μｍＱ範囲内がよい。The thickness of the carbide layer is preferably in the range of 5 to 10 μmQ.

これよりも厚いと被覆層の剥離の原因になシやすく、又
、これよりも薄いとポンチとブランクの耐焼付性の向上
に役立ない。If it is thicker than this, it will easily cause the coating layer to peel off, and if it is thinner than this, it will not be useful for improving the seizure resistance of the punch and blank.

炭化物層の表面は、鏡面のように滑らかにしておくこと
・すなわち面粗さｔ　Ｒｍｇｘ−α１μｍ以下にとどめ
ておくことが望ましい。これ以上粗くなるとせん孔深さ
によっては押出底形時、特に、ポ庚 ンチの引抜き時に、押出品の内表面にひっかき傷が生じ
やすくなり、常に鏡面のような内表面を得ることが困難
となる。It is desirable that the surface of the carbide layer be made as smooth as a mirror surface, that is, that the surface roughness tRmgx-α should be kept at 1 μm or less. If the hole becomes rougher than this, depending on the depth of the hole, the inner surface of the extruded product may be easily scratched during extrusion, especially when the punch is pulled out, making it difficult to always obtain a mirror-like inner surface. .

ポンチの母材は、押出加工時に受ける大きな面正に耐え
る母材強度全音する材質でなければならない。そのため
、母材は・ダイス鋼では・強度が充分でなく、高速度鋼
が望ましい。The base material of the punch must be made of a material that is strong enough to withstand the large surface roughness experienced during extrusion processing. Therefore, die steel does not have sufficient strength for the base material, and high-speed steel is preferable.

上記の炭化物被覆ボンデを用いて、無潤滑ブランクに対
して冷間で後方せん孔押出加工を行う。Using the carbide-coated bonde described above, a non-lubricated blank is subjected to cold backward drilling extrusion processing.

なお１本発明の後方せん孔押出加工とは後方せん孔押出
加工と同時に前号押出加工も行う前後方押出加工をも含
むものとする。Note that the rear perforation extrusion process of the present invention includes front and rear extrusion processes in which the previous extrusion process is performed simultaneously with the rear perforation extrusion process.

ブランクに対しせん孔押出加工を終った後、ついで・押
出品とポンチを一体としてダイスから取り出す工程を行
う。押出品とポンチとを一体としてダイスから取り出す
方法としては、第８図に示ストオリ・ポンチをダイスか
ら引抜く時にブランフカポンチと一諸になって上昇して
ゆくブランクアップによシダイスから取り出す方法があ
る。また押出品を下からノックアラ）１０で押してダイ
ス４からポンチ８と押出品６を強制的に取り出す方法、
また、押出品を押圧しているダイス４ｔ−左右に移動さ
せて押出品をダイスの拘束からはずして分離させる方法
等がある。After punching and extruding the blank, a process is then carried out in which the extruded product and the punch are taken out as a unit from the die. A method for taking out the extruded product and the punch as one unit from the die is as shown in Figure 8, which is a method of taking out the extruded product and the punch from the die by blanking up, which rises together with the blank punch when the punch is pulled out from the die. There is. Also, a method of forcibly taking out the punch 8 and the extruded product 6 from the die 4 by pushing the extruded product from below with a knocker (10);
Alternatively, there is a method in which the die 4t pressing the extruded product is moved from side to side to separate the extruded product from the restraint of the die.

ついで押出品とポンチとを分離させる。分離させる方法
としては、−例として、第８図に示すように・ダイスの
上部にストリッパー１１を設けて行う方法がある。ダイ
ス４から抜は出た押出品６とポンチ８は・押出品６がス
トリッパー１１にぶつかるとともに、ポンチａと押出品
６が分離するものである。このように押出品がダイス内
にあって高面圧状鴎にある時には、ポンチと押出品は摺
動せず、ダイスの拘束がなくなり面圧が低くなった時に
ポンチが始めて押出品から抜けるようにしている。かく
してポンチ引抜き時の押出品の内表面の損傷を防ぐこと
ができ、鏡面のように滑らかな内表面を得ることができ
る。The extrudate and punch are then separated. As a method for separating, for example, as shown in FIG. 8, there is a method in which a stripper 11 is provided on the upper part of the die. The extruded product 6 and the punch 8 removed from the die 4 collide with the stripper 11, and the punch a and the extruded product 6 are separated. In this way, when the extruded product is in the die and under high surface pressure, the punch and the extruded product do not slide, and the punch only comes out of the extruded product when the die is no longer constrained and the surface pressure becomes low. I have to. In this way, the inner surface of the extruded product can be prevented from being damaged when the punch is pulled out, and a mirror-like smooth inner surface can be obtained.

以下、実施例に基づき本発明をさらに詳細に説明する。Hereinafter, the present invention will be explained in more detail based on Examples.

実施例 第１図に示すごとく、ダイス４とノックアウト１０によ
り′形成されるダイス穴２に、被押出材たるブランク１
を挿入し、ノックアウトｌＯの上に、置いた。ついで１
表面に膨化物被覆層９を形成し・先端に膨出部をなすポ
ンチノーズ部８１を有するポンチ８を、第２図に示すご
とく、ダイス穴に挿入し、ブランク７を後方せん孔押出
加工した。その後、第８図に示すごとく成形された押出
品６とポンチ８を一体としてダイス４から取り出した。Embodiment As shown in FIG.
was inserted and placed on top of the knockout IO. Then 1
As shown in FIG. 2, a punch 8 having a swelling substance coating layer 9 formed on its surface and having a punch nose portion 81 having a bulging portion at the tip was inserted into the die hole, and the blank 7 was subjected to backward perforation extrusion processing. Thereafter, the extruded product 6 formed as shown in FIG. 8 and the punch 8 were taken out from the die 4 as a unit.

ついで、押出品６とポンチ８がダイス穴から抜は出た段
階で、押出品６は上方に固定されたス）　ＩＪツバ−１
１に接触して、ポンチ８から取り外された。このように
して得られた押出品６は内径２Ｌ２Ｕ外径８０ｍの太き
であった。Next, when the extruded product 6 and the punch 8 are removed from the die hole, the extruded product 6 is fixed upward.
1 and was removed from the punch 8. The extruded product 6 thus obtained had an inner diameter of 2L2U and an outer diameter of 80m.

ポンチの材質は、高速度鋼（Ｊより　ＳＫＨ９）を使用
し友。ポンチ表面の膨化物被覆層の形成にあたっては、
硼砂金主剤とし、酸化バナジウム（ＶｘＯｓ）層 素（ＢｉＣ）ｅ添加した溶融塩浴に１０００”０で５時
間浸漬し、ポンチ表面に厚さ約７μｍのバナジウム炭化
物（ＶＣ）層を形成した。以下・この６８）とした。な
お、ポンチノーズ部８１はダイヤモンドペーストでラッ
プして、０１μｍ以下のｌ粗さにした。The material of the punch is high speed steel (SKH9 from J). In forming the expanded material coating layer on the surface of the punch,
A vanadium carbide (VC) layer with a thickness of about 7 μm was formed on the surface of the punch by immersing it in a molten salt bath containing borax gold as the main ingredient and vanadium oxide (VxOs) layer (BiC) added thereto for 5 hours at 1000"0.・The punch nose portion 81 was wrapped with diamond paste to have a roughness of 01 μm or less.

被押出材たるブランクは、　Ｊｘｓｓ工ＯＣの球状化燗
鉤材（Ｈｖ〜１２０）よシ表る。ブランクの７ト ポンチとの接触面は番セνンで脱脂した後は無潤滑状顛
であるが、それ以外のブランクの面はリン酸塩被膜処理
が施されていた。The blank, which is the material to be extruded, is a spherical spheroidal material (Hv~120) manufactured by Jxss Kogyo OC. The surface of the blank that came in contact with the 7-point punch was not lubricated after being degreased with a punch, but the other surfaces of the blank were treated with a phosphate coating.

〜２０　Ｏｆｆ／Ｓであった。又、ブランクの断面減少
率は５０％であった。~20 Off/S. Further, the cross-sectional reduction rate of the blank was 50%.

なお・さらに、ポンチノーズ部の面粗さをそれぞれＲｍ
ａｘ　ｗｍ　（Ｌ　１　μｍ　、　１　μｍ　＃　１１
　ｐｍ　＋　６　ｐｒｎと変え、又、せん孔深さも５ｆ
ｆから８７ｍ″Ｉ！でそれぞれ賢化させて本発明のせん
孔押出加工を行った。Furthermore, the surface roughness of the punch nose part is Rm.
ax wm (L 1 μm, 1 μm #11
Changed to pm + 6 prn, and the drilling depth was also changed to 5f.
The hole extrusion process of the present invention was performed by refining each hole from f to 87 m''I!.

そして、得られた押出品の内表面の性状を観察した。そ
の結果を第１表に示す。Then, the properties of the inner surface of the obtained extruded product were observed. The results are shown in Table 1.

なお表中の「押出行程」の欄の「押」とは、ブランクを
押込む時をさし、又「引」とはブランクからポンチが引
抜かれる時をさす、又図中の○印は、「焼付、ひっかき
痕なし」、Δ印は「焼付・ひっかき痰中」、Ｘ印は「焼
付多」、凶印は［ひっかき痕多」をそれぞれ意味してい
る。又、（○）印は・引抜く時−諸にブランクも上昇し
たこと。In addition, "push" in the "extrusion process" column in the table refers to the time when the blank is pushed in, and "pull" refers to the time when the punch is pulled out from the blank. ``No burning or scratching marks'', Δ mark means ``burning/scratching sputum'', X mark means ``extensive burning'', and bad mark means [many scratching marks]. Also, the mark (○) indicates that the blank also rose when it was pulled out.

すなわちブランクアップの発生を示している。In other words, this indicates the occurrence of blanking.

表１表 又、同時に本発明の効果の比較のため・ＶＯ被ポンチを
焼入焼戻ポンチという）、他方・Ｊ工５ＳＩＯＣ球状焼
妊材（Ｈマー１１Ｏ）からなる無潤滑ブランクと、同一
材にリン酸塩被膜処理を施したブランクの二種類を準備
した。そして、上記焼入焼戻ポンチを使用して本発明と
同一の条件の下で、上記無潤滑ブランクと、リン酸塩被
膜処理を施したブランクとの両者に対して、後方せん孔
押出加工を行った。その結果得られた押出品の内表面の
性状を各１２第１表に示す。Table 1 Also, for comparison of the effects of the present invention, the VO punch is referred to as a quenched and tempered punch), on the other hand, a non-lubricated blank made of J-K5SIOC spherical burnt material (H-Mer 11O), and the same material. Two types of blanks were prepared which were treated with phosphate coating. Then, using the above-mentioned quenching and tempering punch, under the same conditions as in the present invention, both the above-mentioned non-lubricated blank and the blank subjected to phosphate coating treatment were subjected to backward perforation extrusion processing. Ta. The properties of the inner surfaces of the resulting extrudates are shown in Table 1.

また、ポンチノーズ部の面粗さがＲｍａｘ　ｗａ　（１
１μｍのポンチを用いて、せん孔押出加工を行い得られ
焼戻ポンチで無潤滑ブランクを押出加工した場合は、第
１表に示すようにポンチが摺動した部分性すべて焼付い
ている。又・その部分の粗さ測定では・第４図に示すご
とく１０〜８０４ｍの凹凸が記録された。これに対し１
本発明の方法であるＶＣ被覆ポンチで無潤滑ブランクを
押出加工し、ポンチ引抜き時にブランクアップの生じた
場合には。In addition, the surface roughness of the punch nose part is Rmax wa (1
When a non-lubricated blank was extruded using a 1 μm punch and then extruded using a tempering punch, all the parts where the punch slid were burned out, as shown in Table 1. Also, in the roughness measurement of that part, as shown in Figure 4, unevenness of 10 to 804 m was recorded. On the other hand, 1
When a non-lubricated blank is extruded using the VC coated punch according to the method of the present invention and blank up occurs when the punch is pulled out.

第６図および第１表に示すように焼付きは全く生ぜず、
押出品の内表面は金属光沢のある鏡面のような非常に滑
らか（Ｒｍａｘ〜α１μｍ）な表面状鴎となっていた。As shown in Figure 6 and Table 1, no seizure occurred at all.
The inner surface of the extruded product had a mirror-like, very smooth surface (Rmax - α1 μm) with a metallic luster.

なお、焼入焼戻ポンチや、ＶＣ被覆ポンチの表面にリン
酸塩被膜処理を施した場合にも第１表に示すように焼付
は生じていない。しかし、焼入焼戻ポンチと、ＶＣ被覆
ポンチのそれぞれによりリン酸塩被膜処理のブランクを
押出し成形して得た各々の押出品の内表面の面粗さを示
す第６図、および第７図と第６図を比較して明らかなよ
うＶこ、ＶＣ被覆ポンチで無潤滑ブランクを押出した場
合の方が金属光沢のある非常に滑らかな表面状鴎が得ら
れている。なお第１表に示されているように、ＶＣ被覆
ポンチで無潤滑ブランク金押出しする場合でも、ポンチ
ノーズ部の面粗さが大きくなったジ、あるいはせん孔深
さが大きくなるとひっかき痕が多くなシ０表面状態が悪
化している。しかし、この場合でも本発明の方法である
ポンチ引抜き時に、ブランクアップを行うことによシ、
ひっかき痕が全くないか、あるいは少ない表面状馨の艮
い押出品を得ることができ九。Furthermore, as shown in Table 1, no seizure occurred even when the surface of the quenched and tempered punch or the VC coated punch was subjected to phosphate coating treatment. However, FIGS. 6 and 7 show the surface roughness of the inner surface of each extruded product obtained by extruding a phosphate-coated blank using a quenching and tempering punch and a VC-coated punch, respectively. As is clear from a comparison between Figure 6 and Figure 6, a very smooth surface with a metallic luster is obtained when a non-lubricated blank is extruded using a VC coated punch. As shown in Table 1, even when extruding blank metal without lubrication using a VC-coated punch, there are cases where the surface roughness of the punch nose becomes large or the hole depth becomes large, resulting in many scratch marks. 0 The surface condition has deteriorated. However, even in this case, by blanking up when pulling out the punch, which is the method of the present invention,
It is possible to obtain an extruded product with a clear surface appearance with no or few scratch marks.

以上要するに９本発明の押出品の製造方法は・耐燭付注
のすぐれた灰化物被覆層を有するポンチを使用４て、無
潤滑ブランクに対し後方せん孔押出加工を行なうことに
よシボンチとブランクの焼付発生を防止し、しかもポン
チと押出品をダイスの拘束が無くなり面圧が低くなつた
状態で分離させることにより押出品の白衣−への損傷の
発生を防止して・鏡面のように滑らかな内表面を有する
押出品の量産全可能としたものである。In summary, the method for manufacturing the extruded product of the present invention is as follows: 4. Using a punch having an ash coating layer with excellent candle resistance, a backward perforation extrusion process is performed on a non-lubricated blank. This prevents seizure, and by separating the punch and extruded product when the die is no longer constrained and the surface pressure is low, it prevents damage to the white coat of the extruded product and creates a mirror-like smooth surface. This makes it possible to mass produce extruded products with inner surfaces.

【図面の簡単な説明】[Brief explanation of drawings]

第１図ないし第８図は会本発明にかかる実施例の成形型
および押出工程を示す図で・第１図社押出前、第２図は
押出成形時、第８図は押出品を抜き出した時を示す図、
第４図ないし第７図は、縦割にされた押出品の内表面の
面粗さを示す線図である− １−・ψブランク、２・・・ダイス穴、８・・・ポンチ
。 ホ０ ４φψ・ダイス、　５　ｍａｍパンチとダイスの隙間。 ６・・・押出品、７・・・ブランクのポンチとの接触面
、８・・・ブランクのダイスとの接触面。 ９・・・炭化物層被覆膚、１０・、・・ノックアウト。 １１−−−ストリッパー 特許出願人　　株式会社　豊田中央研究所第３図 ↑ 第４図 第５図 第７図 第６回Figures 1 to 8 are diagrams showing the mold and extrusion process of an embodiment of the present invention. Figure 1 is before extrusion, Figure 2 is during extrusion molding, and Figure 8 is when the extruded product is extracted. diagram showing the time,
FIGS. 4 to 7 are diagrams showing the surface roughness of the inner surface of the extruded product cut vertically. Ho 0 4φψ・Dice, 5 mam Gap between punch and die. 6... Extruded product, 7... Contact surface of blank with punch, 8... Contact surface of blank with die. 9... Carbide layer covered skin, 10... Knockout. 11--- Stripper patent applicant Toyota Central Research Institute Co., Ltd. Figure 3 ↑ Figure 4 Figure 5 Figure 7 Figure 6

Claims (1)

【特許請求の範囲】 表面Ｋｍｍ化物被覆合金形成たポンチを用いて。 ポンチとの接触面を無潤滑としたブランクに対して冷間
で後方せん孔押出加工を行う工程と。 ついで押出品とポンチを一体としてダイスから取シ出す
工程と、最後に、押出品とポンチとを分離する工程とよ
りなること全特徴とする押出品の製造方法。[Claims] Using a Kmm compound-coated alloyed punch on the surface. A process of performing cold backward drilling and extrusion processing on a blank with no lubrication on the contact surface with the punch. A method for producing an extruded product, which is characterized by comprising the following steps: the extruded product and the punch are then taken out from a die as a unit, and finally the extruded product and the punch are separated.
JP16811181A 1981-10-21 1981-10-21 Manufacturing method for extruded products Expired JPS599245B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP16811181A JPS599245B2 (en) 1981-10-21 1981-10-21 Manufacturing method for extruded products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP16811181A JPS599245B2 (en) 1981-10-21 1981-10-21 Manufacturing method for extruded products

Publications (2)

Publication Number Publication Date
JPS5868420A true JPS5868420A (en) 1983-04-23
JPS599245B2 JPS599245B2 (en) 1984-03-01

Family

ID=15862050

Family Applications (1)

Application Number Title Priority Date Filing Date
JP16811181A Expired JPS599245B2 (en) 1981-10-21 1981-10-21 Manufacturing method for extruded products

Country Status (1)

Country Link
JP (1) JPS599245B2 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2899499A1 (en) * 2006-04-11 2007-10-12 Manoir Ind Soc Par Actions Sim PRECISION EXTRUSION METHOD FOR HOLLOW METAL PIECES AND ASSOCIATED DEVICE
CN103302124A (en) * 2013-04-27 2013-09-18 太原科技大学 Hot backward extrusion punch device with safety protection
CN107321808A (en) * 2017-06-27 2017-11-07 中北大学 A kind of forward extrusion homogeneous deformation mould
CN110773954A (en) * 2019-10-16 2020-02-11 中北大学 Method for forming variable-wall-thickness double-drum-shaped revolving body cylindrical component
CN116871345A (en) * 2023-09-06 2023-10-13 陕西长羽航空装备股份有限公司 Reverse extrusion forming method for small-sized dissimilar alloy

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2899499A1 (en) * 2006-04-11 2007-10-12 Manoir Ind Soc Par Actions Sim PRECISION EXTRUSION METHOD FOR HOLLOW METAL PIECES AND ASSOCIATED DEVICE
WO2007116151A1 (en) * 2006-04-11 2007-10-18 Manoir Industries Method for the precision extrusion of hollow metal components and associated device
CN103302124A (en) * 2013-04-27 2013-09-18 太原科技大学 Hot backward extrusion punch device with safety protection
CN103302124B (en) * 2013-04-27 2015-08-19 太原科技大学 A kind of hot backward extrusion punch device with safeguard protection
CN107321808A (en) * 2017-06-27 2017-11-07 中北大学 A kind of forward extrusion homogeneous deformation mould
CN110773954A (en) * 2019-10-16 2020-02-11 中北大学 Method for forming variable-wall-thickness double-drum-shaped revolving body cylindrical component
CN116871345A (en) * 2023-09-06 2023-10-13 陕西长羽航空装备股份有限公司 Reverse extrusion forming method for small-sized dissimilar alloy
CN116871345B (en) * 2023-09-06 2023-12-01 陕西长羽航空装备股份有限公司 Reverse extrusion forming method for small-sized dissimilar alloy

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