JPS62208527A - Manufacture of end cap for magnetron - Google Patents

Manufacture of end cap for magnetron

Info

Publication number
JPS62208527A
JPS62208527A JP5120186A JP5120186A JPS62208527A JP S62208527 A JPS62208527 A JP S62208527A JP 5120186 A JP5120186 A JP 5120186A JP 5120186 A JP5120186 A JP 5120186A JP S62208527 A JPS62208527 A JP S62208527A
Authority
JP
Japan
Prior art keywords
forging
end cap
sintered material
molybdenum
cold forging
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
JP5120186A
Other languages
Japanese (ja)
Other versions
JPH0451927B2 (en
Inventor
Takeo Hamada
浜田 健雄
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.)
Toho Kinzoku Co Ltd
Original Assignee
Toho Kinzoku Co Ltd
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 Toho Kinzoku Co Ltd filed Critical Toho Kinzoku Co Ltd
Priority to JP5120186A priority Critical patent/JPS62208527A/en
Publication of JPS62208527A publication Critical patent/JPS62208527A/en
Publication of JPH0451927B2 publication Critical patent/JPH0451927B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Powder Metallurgy (AREA)
  • Microwave Tubes (AREA)

Abstract

PURPOSE:To improve dimensional accuracy and processing yield, by performing cold forging on a sintered material made of molybdenum by powder metallurgy, to give the material a final form. CONSTITUTION:A powder of molybdenum in a prescribed grain size is molded under pressure in a metal mold so that a compared powder piece in a prescribed form is made. The piece is sintered at a temperature of 2,000 deg.C or more in a steam flow or the like so that a sintered material 5 for an end cap 1 is obtained nearly in final form and dimensions. The dimensions of the sintered material 5 are slightly larger than those of the end cap, and are not very accurate because of a distortion or the like caused in the sintering. The sintered material 5 is then subjected to cold forging in a prescribed metal mold so that the end cap 1 is obtained. The cold forging is called 'sizing' and performed by using the metal mold comprising a die having an end cap formation opening and an upper and a lower punches, and a hydraulic or pneumatic press or the like.

Description

【発明の詳細な説明】 [産業上の利用分野] 本発明は電子レンジ等に用いられるマグネトロン用エン
ドハツトの製法に関する。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing an end hat for a magnetron used in a microwave oven or the like.

[従来の技術] マグネトロン用エンドハツト(以下、単にエンドハツト
と呼、S’、)’lは、第1図に示す如くリード棒とし
て働く丸棒状のサポート材2の先端部にろう付され、通
電用コイル3を支持するために用いられるものであり、
材質としてはモリブデンが一般的に採用されている。
[Prior Art] An end hat for a magnetron (hereinafter simply referred to as an end hat, S')'l is brazed to the tip of a round bar-shaped support member 2 that acts as a lead rod, as shown in Fig. 1, and is used for conducting electricity. It is used to support the coil 3,
Molybdenum is generally used as the material.

[発明が解決しようとする問題点] 従来のモリブデン製エンドハツトは丸棒から削り出す方
法によって’I造されていたので、製造コストが高く、
材料歩留りも低かった。これを改良するため、粉末冶金
法によって所定形状の焼結体として製造する方法も試み
られているが、焼結体のままでは所望の寸法精度を得る
のが難しいという問題点があった。
[Problems to be solved by the invention] Conventional molybdenum end hats were manufactured by cutting a round bar, resulting in high manufacturing costs.
Material yield was also low. In order to improve this, attempts have been made to produce a sintered body in a predetermined shape using a powder metallurgy method, but there is a problem in that it is difficult to obtain the desired dimensional accuracy with the sintered body as it is.

[問題点を解決するための手段] 上記問題点を解決するため、本発明はつぎのような構成
を採用した。
[Means for Solving the Problems] In order to solve the above problems, the present invention employs the following configuration.

すなわち、本発明にがかるマグネトロン用エンドハツト
の製法は、粉末冶金法で製造されたモリブデン製焼結体
素材に冷間鍛造を施して最終形状寸法のエンドハツトを
得ることを特徴としている。
That is, the method for manufacturing an end hat for a magnetron according to the present invention is characterized by cold forging a molybdenum sintered body material manufactured by a powder metallurgy method to obtain an end hat in the final shape and size.

これを実施例にもとづいてより具体的に説明すれば、先
ず公知の粉末冶金技術によってモリブデン製の焼結素材
を製造する。すなわち、所定粒度のモリブデン金属粉末
を金型中で加圧成形して所定形状の圧粉体とし、この圧
粉体を例えば水素気流中で2000℃以上の温度で焼結
する。これによって第2図に示すようなR線形状寸法に
近いエンドハツト焼結素材5が得られるが、このものは
最終寸法よりも若干大きく、しかも焼結の際に発生する
歪等のため寸法精度がそれほどよくないものである。
To explain this in more detail based on an example, first, a sintered material made of molybdenum is manufactured using a known powder metallurgy technique. That is, molybdenum metal powder of a predetermined particle size is pressure-molded in a mold to form a compact into a predetermined shape, and this compact is sintered, for example, at a temperature of 2000° C. or higher in a hydrogen stream. As a result, an end hat sintered material 5 having approximate R-line shape dimensions as shown in Fig. 2 is obtained, but this material is slightly larger than the final dimension and has poor dimensional accuracy due to distortions generated during sintering. It's not that good.

つぎに、この焼結体素材に所定の金型を用いて冷間鍛造
を施し、第3図に例示するようなエンドハツト1を得る
。この冷間鍛造はサイジングと呼ばれるもので、エンド
ハツト成形空間を有するダイと上下のパンチとで構成さ
れる金型および油圧または空圧で作動するプレス機等を
用いて行なわれる。このとぎ適当な潤滑剤を用いて鍛造
を行なうのが好ましく、上下両側から加圧するのが好ま
しい。プレス機には成形後のエンドハツトを取り出すた
め高圧力のノックアウト機能が要求される。
Next, this sintered material is subjected to cold forging using a predetermined mold to obtain an end hat 1 as illustrated in FIG. 3. This cold forging is called sizing, and is carried out using a mold consisting of a die having an end hat forming space and upper and lower punches, and a press machine operated by hydraulic or pneumatic pressure. It is preferable to perform forging using a suitable lubricant, and it is preferable to apply pressure from both the upper and lower sides. The press machine requires a high-pressure knockout function to take out the end hat after molding.

上記潤滑剤としては、炭素系または二硫化モリブデン(
MoS 2>系の粉末状潤滑剤を用いるのが好ましい。
The above lubricant may be carbon-based or molybdenum disulfide (
It is preferable to use a powdered lubricant based on MoS 2>.

粉末状潤滑剤には焼結体素材5への付着性を改良するた
め、潤滑油等の液体を少量添加しておくのが好ましい。
In order to improve the adhesion to the sintered body material 5, it is preferable to add a small amount of liquid such as lubricating oil to the powdered lubricant.

なお、第3図に示すエンドハツトは、第1図に示すもの
と若干形状を異にしているが、この方法によれば種々の
形状、寸法のものを製造することができる。
Although the shape of the end hat shown in FIG. 3 is slightly different from that shown in FIG. 1, it is possible to manufacture end hats of various shapes and sizes using this method.

第4図は、本発明の実施に用いる鍛造装置の1例を模式
的にあうりすもので、この鍛造装置Oは上圧駆動ピスト
ン11と下圧駆動ピストン12をそなえ、円筒状ダイ1
5がテーブル13上に取り付けられる。また、上パンチ
16は上側のピストン11に、下パンチ17は下側のピ
ストン12にそれぞれ取り付けられる。下バンチ17は
円柱状の芯部17aと円筒状の外周部17bとを組み合
わせてなる。なお、超硬合金でつくられたダイ15と工
具鋼でつくられた上パンチ16はそれぞれヒータ19,
20によって加熱されるようになっている。 金型の加
熱温度は50〜400’Cとするのが好ましく、150
〜300℃とするのがより好ましい。この加熱温度が低
いと成形体に割れが生じやすく、高すぎると材質の相違
によりパンチとダイの嵌合いに狂いが生じる。同様にワ
ークとなる焼結素材5も50〜4QQ℃、より好ましく
は200〜300℃に予熱しておくのが好ましい。
FIG. 4 schematically shows an example of a forging device used in carrying out the present invention. This forging device O is equipped with an upper pressure drive piston 11 and a lower pressure drive piston 12,
5 is mounted on the table 13. Further, the upper punch 16 is attached to the upper piston 11, and the lower punch 17 is attached to the lower piston 12. The lower bunch 17 is formed by combining a cylindrical core portion 17a and a cylindrical outer peripheral portion 17b. Note that the die 15 made of cemented carbide and the upper punch 16 made of tool steel are connected to heaters 19 and 16, respectively.
It is heated by 20. The heating temperature of the mold is preferably 50 to 400'C, and 150 to 400'C.
It is more preferable to set the temperature to 300°C. If the heating temperature is too low, cracks will easily occur in the molded product, and if it is too high, the fit between the punch and die will be distorted due to the difference in materials. Similarly, it is preferable to preheat the sintered material 5 that will become the workpiece to 50 to 4QQ°C, more preferably 200 to 300°C.

これら金型とワークの予熱温度はモリブデンの再結晶温
度よりも低いので、この鍛造は冷間鍛造の範囲に入るも
のである。従来、モリブデンの冷間鍛造はワークにクラ
ックや割れが発生するので実用化されていなかったが、
このように適当な予熱温度と潤滑油を選択すれば充分実
用化が可能である。なお、この冷間鍛造は自動的に能率
よく行なうことができるので実生産に適したものである
Since the preheating temperature of these molds and workpieces is lower than the recrystallization temperature of molybdenum, this forging falls within the range of cold forging. Traditionally, cold forging of molybdenum has not been put to practical use because it causes cracks and cracks in the workpiece.
As described above, by selecting an appropriate preheating temperature and lubricating oil, it is possible to put it into practical use. It should be noted that this cold forging can be carried out automatically and efficiently, making it suitable for actual production.

し実施例] 公知の粉末冶金法により第2図に示すようなモリブデン
製エンドハツト焼結体素材を製造した。
Example] A molybdenum end hat sintered body material as shown in FIG. 2 was manufactured by a known powder metallurgy method.

この焼結体素材(複数個)と炭素系の粉末状潤滑剤(予
め若干のマシン油を添加して湿らせておいた)をボール
ミルのポットに入れ、30分乃至4時間ポットを回転し
て焼結体素材の全表面に潤滑剤を付着させた。しかるの
ち、第4図に示すような@造装置と金型を用いて、金型
温度200℃、ワーク温度200℃で鍛造を行ない、第
3図に示すようなエンドハツト1を得た。
Place the sintered material (several pieces) and a carbon-based powder lubricant (pre-moistened with a small amount of machine oil) into a ball mill pot, and rotate the pot for 30 minutes to 4 hours. A lubricant was applied to the entire surface of the sintered material. Thereafter, forging was carried out using a forging device and a mold as shown in FIG. 4 at a mold temperature of 200° C. and a workpiece temperature of 200° C. to obtain an end hat 1 as shown in FIG. 3.

試料数25個について調べた鍛造前後の寸法について述
べれば、鍛造前の外径Aの平均値が9、896mM、最
大値が9.980m、最小値が9.820m、標準偏差
(σ)が0.040mで必り、鍛造後のそれは、全数が
10.000mとなった。また、内径Bは、鍛造前の平
均値が5.104履、最大値が5.180m、最小値が
5.060rMt1標Q−偏差(σ)が0.027an
であり、@造機のそれは全数が5.000mmとなった
Regarding the dimensions of 25 samples before and after forging, the average value of the outer diameter A before forging is 9.896 mm, the maximum value is 9.980 m, the minimum value is 9.820 m, and the standard deviation (σ) is 0. The total length after forging was 10.000m. In addition, the inner diameter B has an average value of 5.104mm before forging, a maximum value of 5.180m, a minimum value of 5.060rMt1 standard Q-deviation (σ) of 0.027an
And the total number of @Zoki's was 5.000mm.

また、内側高さCは、鍛造前の平均値が3.112m1
最大値3.200m、最小値3.040m、標準偏差0
.040順でおり、一方、鍛造後の・平均値は2.99
9馴、最大値3.000m、最小値2.990m、標準
偏差0、003.であった。ざらに、外側の高ざDは、
鍛造前の平均値が5.108順、最大値5.180m、
最小値5.060履、標準偏差0.029履で市り、鍛
造後の平均値は4.999s、 R大値が5.0OOs
、最小値が4.980m、標準偏差が0.005mでめ
った。エンドハツトは使用に際してリード棒が嵌着ろう
接されるためきびしい寸法精度が要求されるが、本発明
を実施すればこのようなきびしい要求を充分満足するこ
とができ゛る。
In addition, the average value of the inner height C before forging is 3.112 m1
Maximum value 3.200m, minimum value 3.040m, standard deviation 0
.. 040 order, and on the other hand, the average value after forging is 2.99
9, maximum value 3.000m, minimum value 2.990m, standard deviation 0,003. Met. Roughly speaking, the outer height D is
The average value before forging is 5.108, the maximum value is 5.180m,
Marketed with a minimum value of 5.060 shoes and a standard deviation of 0.029 shoes.The average value after forging is 4.999s, and the maximum R value is 5.0OOs.
, the minimum value was 4.980 m and the standard deviation was 0.005 m. When the end hat is used, a lead rod is fitted and soldered to the end hat, so strict dimensional accuracy is required, and by implementing the present invention, such strict requirements can be fully satisfied.

つぎにビッカース硬度と比重は、鍛造前の硬度(HV)
の平均値が149、鍛造後の平均値が183、鍛造前の
比重の平均値が訊49、鍛造後の平均値が9.83であ
った。エンドハツトはリード棒がスポット溶接されるこ
ともあるので、強度がある程度高くなければならないが
、上記鍛造後の硬度と比重を有するものはその要求に充
分耐えられるものである。
Next, Vickers hardness and specific gravity are the hardness before forging (HV)
The average value of specific gravity was 149, the average value after forging was 183, the average value of specific gravity before forging was 49, and the average value after forging was 9.83. Since the lead rod is sometimes spot welded to the end hat, it must have a certain degree of strength, but one having the above-mentioned hardness and specific gravity after forging can sufficiently withstand this requirement.

ざらに、表面粗さについて調べた結果は、鍛造前の表面
は梨地状でざらざらした感触があるが、鍛造後の表面は
平滑で金属光沢を有するようになる。小板研究所!l!
5P−11型表面粗さ測定装置を用いて鍛造前後の表面
粗さくμm)を測定したところ、鍛造前は最大粗ざRm
ax =13.25 、十点平均粗ざRZ= 9.25
 、中心線平均粗ざRa= 0.77であり、鍛造後は
Rmax= 2.01RZ= 1.0. Ra= 0.
11であった。トリエーテッドタングステン製のコイル
から発せられる電磁波の方向を安定させるため、エンド
ハツトの表面は平滑であることが要求されるが、上記の
如く鍛造後のエンドハツトの表面粗さはきわめて良好で
必り、充分その要求を満たすものである。
In general, the results of investigating the surface roughness show that the surface before forging has a matte finish and has a rough feel, but the surface after forging is smooth and has a metallic luster. Koita Research Institute! l!
When the surface roughness (μm) before and after forging was measured using a 5P-11 type surface roughness measuring device, the maximum roughness (μm) before forging was
ax = 13.25, ten point average roughness RZ = 9.25
, center line average roughness Ra=0.77, and after forging Rmax=2.01RZ=1.0. Ra=0.
It was 11. In order to stabilize the direction of electromagnetic waves emitted from the thoriated tungsten coil, the surface of the end hat must be smooth, but as mentioned above, the surface roughness of the end hat after forging must be extremely good and sufficient. It satisfies that requirement.

なお、結晶組織は、鍛造前のものが焼結インゴット特有
の粗大結晶でおるのに対し、fR造後のものは充分に微
細化したものであった。
Note that the crystal structure before forging had coarse crystals typical of sintered ingots, whereas the crystal structure after fR forging was sufficiently refined.

[発明の効果] 以上の説明から明らかな如く、本発明の製造方法は、寸
法精度と加工歩留りが高く、しかも強度その他の性質が
良好なエンドハツトを実生産的規模で製造することがで
きるようになった。
[Effects of the Invention] As is clear from the above description, the manufacturing method of the present invention makes it possible to manufacture end hats with high dimensional accuracy and processing yield, as well as good strength and other properties, on a commercial scale. became.

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

第1図はエンドハツトの使用状態をあられす断面図、第
2図は焼結体素材の断面図、第3図はエンドハツトの断
面図、第4図は鍛造装置の説明図でおる。
FIG. 1 is a sectional view of the end hat in use, FIG. 2 is a sectional view of the sintered material, FIG. 3 is a sectional view of the end hat, and FIG. 4 is an explanatory diagram of the forging device.

Claims (1)

【特許請求の範囲】[Claims] (1)粉末冶金法で製造されたモリブデン製焼結体素材
に冷間鍛造を施して最終形状寸法のエンドハットを得る
ことを特徴とするマグネトロン用エンドハットの製法。
(1) A method for producing an end hat for a magnetron, which is characterized by cold forging a molybdenum sintered material produced by powder metallurgy to obtain an end hat in the final shape and size.
JP5120186A 1986-03-07 1986-03-07 Manufacture of end cap for magnetron Granted JPS62208527A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5120186A JPS62208527A (en) 1986-03-07 1986-03-07 Manufacture of end cap for magnetron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5120186A JPS62208527A (en) 1986-03-07 1986-03-07 Manufacture of end cap for magnetron

Publications (2)

Publication Number Publication Date
JPS62208527A true JPS62208527A (en) 1987-09-12
JPH0451927B2 JPH0451927B2 (en) 1992-08-20

Family

ID=12880279

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5120186A Granted JPS62208527A (en) 1986-03-07 1986-03-07 Manufacture of end cap for magnetron

Country Status (1)

Country Link
JP (1) JPS62208527A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5861716A (en) * 1995-02-20 1999-01-19 Hitachi, Ltd. Magnetron having a cathode mount with a grooved recess for securely receiving a cathode filament
WO2012008580A1 (en) * 2010-07-16 2012-01-19 株式会社東芝 End hat for magnetron, process for producing same, and magnetron
JP2019070194A (en) * 2018-11-29 2019-05-09 住友電工焼結合金株式会社 Sintered component
JPWO2018146868A1 (en) * 2017-02-08 2019-12-12 住友電工焼結合金株式会社 Sintered part manufacturing method and sintered part
US11305347B2 (en) 2014-12-12 2022-04-19 Sumitomo Electric Sintered Alloy, Ltd. Method for manufacturing sintered component, sintered component, and drill

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53106615A (en) * 1977-03-01 1978-09-16 Amax Inc Method of making molybdenum alloy processed products
JPS5650381A (en) * 1979-10-01 1981-05-07 Casio Computer Co Ltd Characterrstate control system for crt character display
JPS5693951U (en) * 1979-12-20 1981-07-25
JPS5846548A (en) * 1981-09-11 1983-03-18 Matsushita Electronics Corp Manufacture of cathode structural body for magnetron

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53106615A (en) * 1977-03-01 1978-09-16 Amax Inc Method of making molybdenum alloy processed products
JPS5650381A (en) * 1979-10-01 1981-05-07 Casio Computer Co Ltd Characterrstate control system for crt character display
JPS5693951U (en) * 1979-12-20 1981-07-25
JPS5846548A (en) * 1981-09-11 1983-03-18 Matsushita Electronics Corp Manufacture of cathode structural body for magnetron

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5861716A (en) * 1995-02-20 1999-01-19 Hitachi, Ltd. Magnetron having a cathode mount with a grooved recess for securely receiving a cathode filament
WO2012008580A1 (en) * 2010-07-16 2012-01-19 株式会社東芝 End hat for magnetron, process for producing same, and magnetron
US11305347B2 (en) 2014-12-12 2022-04-19 Sumitomo Electric Sintered Alloy, Ltd. Method for manufacturing sintered component, sintered component, and drill
US11325186B2 (en) 2014-12-12 2022-05-10 Sumitomo Electric Sintered Alloy, Ltd. Method for manufacturing sintered component, sintered component, and drill
JPWO2018146868A1 (en) * 2017-02-08 2019-12-12 住友電工焼結合金株式会社 Sintered part manufacturing method and sintered part
JP2019070194A (en) * 2018-11-29 2019-05-09 住友電工焼結合金株式会社 Sintered component

Also Published As

Publication number Publication date
JPH0451927B2 (en) 1992-08-20

Similar Documents

Publication Publication Date Title
JP6023605B2 (en) Sputtering target and its forming method by rotary / shaft forging
CN104846341B (en) Isothermal extrusion production method of refractory metal rotating target material
JP2007536431A5 (en)
US4921664A (en) Method for producing a heat-resistant aluminum-alloy workpiece having high transverse ductility which is manufactured from a compact produced by powder metallurgy
JP2558858B2 (en) Hollow member forging device and method
US3785038A (en) Process of working a sintered powder metal compact
CN116140625B (en) Preparation method of wedge-shaped riving knife material
JPS62208527A (en) Manufacture of end cap for magnetron
EP0394388B1 (en) Method for the manufacture of rivet for a fixed spike or for a sleeve-mounted spike, respectively, and equipment for carrying out the method
US3987658A (en) Graphite forging die
JP2002035884A (en) Gear die for warm or hot forging and manufacturing method thereof
JPH0639471A (en) Manufacture of melting material forging part
CN105499579B (en) A kind of manufacture method of powder metallurgy support
CN105436506B (en) A kind of manufacture method of powder metallurgy support
GB2370844A (en) Tabletting dies made from sintered ferrous powder
US11745261B2 (en) Sintered gear
Srinivasababu Manufacturing dies and punches for preparation of powder metallurgical mechanical test specimens
JP2000144210A (en) Forging method of metallic powder
Crane et al. Presses and Processes for Metal Powder Products
JPS63290202A (en) Production of spiral part by forging aluminum alloy powder
JP2008290890A (en) Method of molding cemented carbide integrally with metallic material and integrally molded member
JP2003286504A (en) Method for manufacturing sintered member with bore superior in coaxiality accuracy
JPS60206520A (en) Manufacture of twisted chip
JPS63250405A (en) Production of high strength product of powder
JPH07188706A (en) Metallic sintered compact excellent in mirror-finish characteristic and its production

Legal Events

Date Code Title Description
LAPS Cancellation because of no payment of annual fees