JP2016097457A - Surface treatment method of member to be forged - Google Patents

Surface treatment method of member to be forged Download PDF

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JP2016097457A
JP2016097457A JP2014234350A JP2014234350A JP2016097457A JP 2016097457 A JP2016097457 A JP 2016097457A JP 2014234350 A JP2014234350 A JP 2014234350A JP 2014234350 A JP2014234350 A JP 2014234350A JP 2016097457 A JP2016097457 A JP 2016097457A
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forged member
forged
surface treatment
abrasive grains
slurry
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JP6101668B2 (en
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幸人 松原
Yukito Matsubara
幸人 松原
保 中村
Tamotsu Nakamura
保 中村
早川　邦夫
Kunio Hayakawa
邦夫 早川
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Shizuoka University NUC
Macoho Co Ltd
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Shizuoka University NUC
Macoho Co Ltd
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Priority to US14/698,937 priority patent/US20160136722A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J1/00—Preparing metal stock or similar ancillary operations prior, during or post forging, e.g. heating or cooling
    • B21J1/02—Preliminary treatment of metal stock without particular shaping, e.g. salvaging segregated zones, forging or pressing in the rough
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
    • B24C1/06—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for producing matt surfaces, e.g. on plastic materials, on glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
    • B24C11/00—Selection of abrasive materials or additives for abrasive blasts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J3/00—Lubricating during forging or pressing

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Forging (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide an epoch-making surface treatment method of a member to be forged capable of showing an unconventional action effect.SOLUTION: In a surface treatment method of a member 1 to be forged, slurry 4 which is a mixture of liquid 2 and abrasive grains 3 is mixed with compressed air and jetted out onto the surface 1a of the member 1 to be forged, to thereby provide recesses 5 each having a depth of 0.5 μm-2.00 μm and an opening width of 75 μm-150 μm countlessly on the surface 1a of the member 1 to be forged.SELECTED DRAWING: Figure 2

Description

本発明は、被鍛造部材の表面処理方法に関するものである。   The present invention relates to a surface treatment method for a forged member.

機械部品の製造方法として採用される冷間鍛造は、切削による製造に比し、製造できる形状が制約されるという点はあるものの、同形のものが量産でき、強度が得られ、加工時間が短く、材料が節減できるなどの数多くのメリットを有する。   Although cold forging adopted as a method for manufacturing machine parts is limited in the shape that can be manufactured compared to manufacturing by cutting, the same shape can be mass-produced, strength is obtained, and processing time is short. , Has many advantages such as saving material.

ところで、従来から、冷間鍛造される加工素材としての円柱状の被鍛造部材の表面には、型離れを良くし、加工時に生じる熱や接触圧力による金型の破損、被鍛造部材そのものの破損を防止する目的で、潤滑処理（通称：ボンデ処理と言われ、潤滑皮膜付着処理）が施されており、被鍛造部材表面への潤滑膜の良好な定着が望まれている。   By the way, on the surface of a cylindrical forged member as a material to be cold forged, the mold separation is improved, the mold is damaged by the heat and contact pressure generated during processing, and the to-be-forged member itself is damaged. In order to prevent this, a lubrication treatment (commonly referred to as bond treatment, lubrication film adhesion treatment) has been performed, and good fixation of the lubrication film on the surface of the forged member is desired.

そこで、本出願人は、特開２００７−３８３０９号や特許第５５２３５０７号に開示されるワーク表面処理装置を提案している。これらの装置は、ワークとしての被鍛造部材の表面に潤滑皮膜を付着させる前に、液体と砥粒との混合物であるスラリを噴射して該被鍛造部材の表面をウエットブラスト処理するものである。   Therefore, the present applicant has proposed a workpiece surface treatment apparatus disclosed in Japanese Patent Application Laid-Open No. 2007-38309 and Japanese Patent No. 5523507. These apparatuses perform wet blasting on the surface of the forged member by injecting a slurry, which is a mixture of liquid and abrasive grains, before attaching a lubricating film to the surface of the forged member as a workpiece. .

このウエットブラスト処理が施されることにより、被鍛造部材の表面に付着している酸化膜や油等の汚れの除去が確実且つ良好に行なわれ、被鍛造部材の表面に細かい凹凸が形成されることで潤滑皮膜が剥がれにくく良好に定着することになる。   By performing this wet blast treatment, the removal of dirt such as oxide film and oil adhering to the surface of the forged member is reliably and satisfactorily performed, and fine irregularities are formed on the surface of the forged member. As a result, the lubricating film is hard to peel off and is fixed well.

特開２００７−３８３０９号公報JP 2007-38309 A 特許第５５２３５０７号公報Japanese Patent No. 5523507

本発明者は、上述したような被鍛造部材の表面処理について更なる研究開発を進め、その結果、従来にない作用効果を発揮する画期的な被鍛造部材の表面処理方法を開発した。   The present inventor has advanced further research and development on the surface treatment of the forged member as described above, and as a result, has developed an innovative surface treatment method for the forged member that exhibits unprecedented effects.

添付図面を参照して本発明の要旨を説明する。   The gist of the present invention will be described with reference to the accompanying drawings.

被鍛造部材１の表面処理方法であって、前記被鍛造部材１の表面１ａに、液体２と砥粒３との混合物であるスラリ４を圧搾空気と混合して噴射し、前記被鍛造部材１の表面１ａに深さ０．５μｍ〜２．００μｍ，開口巾７５μｍ〜１５０μｍの凹所５を無数に設けることを特徴とする被鍛造部材の表面処理方法に係るものである。   A method of surface treatment of a forged member 1, wherein a slurry 4, which is a mixture of a liquid 2 and abrasive grains 3, is mixed with compressed air and sprayed onto the surface 1 a of the forged member 1, and the forged member 1 This invention relates to a surface treatment method for a to-be-forged member, characterized in that an infinite number of recesses 5 having a depth of 0.5 μm to 2.00 μm and an opening width of 75 μm to 150 μm are provided on the surface 1a.

また、請求項１記載の被鍛造部材の表面処理方法において、前記被鍛造部材１はクロムモリブデン鋼であることを特徴とする被鍛造部材の表面処理方法に係るものである。   The forged member surface treatment method according to claim 1, wherein the forged member 1 is made of chromium molybdenum steel.

また、請求項１，２いずれか１項に記載の被鍛造部材の表面処理方法において、前記砥粒３として平均粒径が約１５０μｍのステンレス砥粒を採用したことを特徴とする被鍛造部材の表面処理方法に係るものである。   The forged member surface treatment method according to any one of claims 1 and 2, wherein the abrasive grains 3 are stainless abrasive grains having an average grain diameter of about 150 µm. This relates to a surface treatment method.

本発明は上述のように構成したから、被鍛造部材の表面に形成される潤滑皮膜が剥がれにくく良好に定着することになるなど、従来にない作用効果を発揮する画期的な被鍛造部材の表面処理方法となる。   Since the present invention is configured as described above, the lubricating film formed on the surface of the forged member is difficult to peel off and is well fixed. It becomes a surface treatment method.

本実施例に係る被鍛造部材の表面処理方法を実施する装置の説明図である。It is explanatory drawing of the apparatus which implements the surface treatment method of the to-be-forged member which concerns on a present Example. 本実施例で表面処理した被鍛造部材の状態を示す説明図である。It is explanatory drawing which shows the state of the forged member surface-treated in a present Example. 本実施例で表面処理した被鍛造部材の表面の部分拡大図である。It is the elements on larger scale of the surface of the forged member surface-treated in the present Example. 本実施例の有効性を示す試験の条件を説明する説明図である。It is explanatory drawing explaining the conditions of the test which shows the effectiveness of a present Example. 前方軸／後方缶押出し試験装置を用いた被鍛造部材の性能試験を示す説明図である。It is explanatory drawing which shows the performance test of the to-be-forged member using a front axis | shaft / rear can extrusion test apparatus. 前方軸／後方缶押出し試験装置を用いた被鍛造部材の性能試験を示す説明図である。It is explanatory drawing which shows the performance test of the to-be-forged member using a front axis | shaft / rear can extrusion test apparatus. 本実施例の有効性を示す試験結果を説明する説明図である。It is explanatory drawing explaining the test result which shows the effectiveness of a present Example. 本実施例の有効性を示す試験結果を説明する説明図である。It is explanatory drawing explaining the test result which shows the effectiveness of a present Example. 本実施例の有効性を示す試験結果を説明する説明図である。It is explanatory drawing explaining the test result which shows the effectiveness of a present Example. 本実施例の有効性を示す試験結果を説明する説明図である。It is explanatory drawing explaining the test result which shows the effectiveness of a present Example. 本実施例の有効性を示す試験結果を説明する説明図である。It is explanatory drawing explaining the test result which shows the effectiveness of a present Example. 本実施例の有効性を示す試験結果を説明する説明図である。It is explanatory drawing explaining the test result which shows the effectiveness of a present Example. 本実施例の有効性を示す試験結果を説明する説明図である。It is explanatory drawing explaining the test result which shows the effectiveness of a present Example.

好適と考える本発明の実施形態を、図面に基づいて本発明の作用を示して簡単に説明する。   An embodiment of the present invention which is considered to be suitable will be briefly described with reference to the drawings showing the operation of the present invention.

本発明は、被鍛造部材１の表面に、液体２と砥粒３との混合物であるスラリ４を圧搾空気と混合して噴射し、被鍛造部材１の表面に深さ０．５μｍ〜２．００μｍ，開口巾７５μｍ〜１５０μｍの凹所５を無数に設ける。   In the present invention, slurry 4, which is a mixture of liquid 2 and abrasive grains 3, is mixed with compressed air and sprayed on the surface of the forged member 1, and the depth of 0.5 μm to 2. An infinite number of recesses 5 having an opening width of 75 μm to 150 μm are provided.

この凹所５を無数に備えた被鍛造部材１は潤滑処理を行った際の油切れが生じにくく、鍛造する素材として極めて秀れたものとなる。   The to-be-forged member 1 provided with an infinite number of the recesses 5 is less likely to run out of oil when subjected to lubrication, and is extremely excellent as a material for forging.

本発明の具体的な実施例について図面に基づいて説明する。   Specific embodiments of the present invention will be described with reference to the drawings.

本実施例は、搬送される円柱状の被鍛造部材１の表面１ａに表面処理を施す被鍛造部材１の表面処理方法である。尚、被鍛造部材１は金属製（クロムモリブデン鋼）の円柱状の被鍛造部材１であり、本書面で言う円柱状とは断面円形状の長さを有するものであって、内部が中空の円筒状のものも含む広義の意味である。   A present Example is a surface treatment method of the to-be-forged member 1 which surface-treats to the surface 1a of the cylindrical to-be-forged member 1 conveyed. The forged member 1 is a cylindrical forged member 1 made of metal (chromium molybdenum steel), and the columnar shape referred to in this document has a circular cross-sectional length, and the inside is hollow. It has a broad meaning including a cylindrical shape.

具体的には、本実施例に係る被鍛造部材１の表面処理方法は、特許第５５２３５０７号に開示される表面処理装置10を用いて行なわれる。   Specifically, the surface treatment method of the forged member 1 according to the present embodiment is performed using the surface treatment apparatus 10 disclosed in Japanese Patent No. 5523507.

この表面処理装置10は、図１に図示したように基体11に円柱状の被鍛造部材１を搬送する搬送部12と、この搬送部12により搬送される被鍛造部材１にウエットブラスト処理及びその他の処理を行う表面処理部とを具備している。   As shown in FIG. 1, the surface treatment apparatus 10 includes a conveying unit 12 that conveys a cylindrical forged member 1 to a base 11, a wet blasting process and the like for the forged member 1 conveyed by the conveying unit 12. And a surface treatment unit for performing the above-described treatment.

具体的には、表面処理部は、ウエットブラスト処理部13と、図示省略のその他の処理部（洗浄処理部、湯洗部、潤滑処理部及び乾燥処理部）とで構成されている。   Specifically, the surface treatment unit includes a wet blast treatment unit 13 and other treatment units (not illustrated) (a washing treatment unit, a hot water washing unit, a lubrication treatment unit, and a drying treatment unit).

ウエットブラスト処理部13は、図１に図示したように円柱状の被鍛造部材１を通過せしめる基体10に設けられ、スラリ噴射部14と、下方位置に配設されるスラリ貯留部15と、このスラリ貯留部15からポンプ装置16を介してスラリ噴射部14へスラリ４を搬送するスラリ搬送部17とを具備し、スラリ噴射部14から噴射されたスラリ４はスラリ貯留部15へ送られて再利用される構成である。   As shown in FIG. 1, the wet blast processing unit 13 is provided on a base body 10 through which the cylindrical forged member 1 passes, and includes a slurry injection unit 14, a slurry storage unit 15 disposed at a lower position, A slurry transport unit 17 for transporting the slurry 4 from the slurry storage unit 15 to the slurry injection unit 14 via the pump device 16, and the slurry 4 injected from the slurry injection unit 14 is sent to the slurry storage unit 15 Configuration used.

スラリ噴射部14は、図１に図示したように円柱状の被鍛造部材１を搬送する搬送部12の上方に配される巾広の噴射ノズルで構成されている。   As shown in FIG. 1, the slurry injection unit 14 is composed of a wide injection nozzle disposed above the conveying unit 12 that conveys the cylindrical forged member 1.

この噴射ノズルには前述したスラリ搬送部17が接続されるとともに、別回路で設けられ圧縮空気供給部18から延設される圧縮空気搬送部19が接続されており、スラリ搬送部17から供給されるスラリ４を圧縮空気搬送部19から供給される圧縮空気により加速して、所定の噴射速度で噴射ノズルから噴射されるように構成されている。   The spray nozzle is connected to the above-described slurry transport unit 17 and is connected to a compressed air transport unit 19 provided in a separate circuit and extending from the compressed air supply unit 18, and is supplied from the slurry transport unit 17. The slurry 4 is accelerated by the compressed air supplied from the compressed air conveying unit 19 and is injected from the injection nozzle at a predetermined injection speed.

また、本実施例で使用するスラリ４は、液体２と微粒子砥粒３との混合物である。   Further, the slurry 4 used in the present embodiment is a mixture of the liquid 2 and the fine particle abrasive grains 3.

以上の構成からなる表面処理装置10を使用した被鍛造部材１への表面処理について説明する。   The surface treatment to the forged member 1 using the surface treatment apparatus 10 having the above configuration will be described.

搬送部12で搬送される円柱状の被鍛造部材１の表面１ａは表面処理部により適宜処理される。   The surface 1a of the cylindrical to-be-forged member 1 conveyed by the conveyance unit 12 is appropriately processed by the surface treatment unit.

具体的には、搬送部12で搬送される円柱状の被鍛造部材１はウエットブラスト処理部13を通過した際、スラリ４を噴射することで円柱状の被鍛造部材１の全表面１ａ（周面及び前後端面）はブラスト処理され、この全表面１ａ（周面及び前後端面）に細かい凹所５が無数に形成される。   Specifically, when the cylindrical forged member 1 conveyed by the conveying unit 12 passes through the wet blast processing unit 13, the entire surface 1a (circumference) of the cylindrical forged member 1 is injected by injecting slurry 4. Surface and front and rear end surfaces) are blasted, and numerous indentations 5 are formed on the entire surface 1a (circumferential surface and front and rear end surfaces).

続いて、ウエットブラスト処理部13でブラスト処理された円柱状の被鍛造部材１は、洗浄処理部を通過した際、洗浄液を噴射することで水洗処理（スラリや削り屑などが除去）される。   Subsequently, the cylindrical forged member 1 blasted by the wet blast processing unit 13 is washed with water (removes slurry, shavings, and the like) by spraying a cleaning liquid when passing through the cleaning processing unit.

続いて、洗浄処理部で水洗処理された円柱状の被鍛造部材１は、湯洗処理部を通過した際、高温水を噴射することで水洗処理及び加熱処理される。   Subsequently, the cylindrical forged member 1 that has been washed with water in the washing treatment unit is subjected to washing treatment and heat treatment by spraying high-temperature water when passing through the hot water washing treatment unit.

続いて、湯洗処理部で水洗処理及び加熱処理された円柱状の被鍛造部材１は、潤滑処理部を通過した際、潤滑剤（例えば金属セッケン）が付与されて潤滑処理される。   Subsequently, when the cylindrical forged member 1 that has been subjected to the water washing treatment and the heat treatment in the hot water washing treatment section passes through the lubrication treatment section, a lubricant (for example, a metal soap) is applied and lubricated.

続いて、潤滑処理部で潤滑処理された円柱状の被鍛造部材１は、乾燥処理部を通過した際、熱風を当てることで乾燥処理（潤滑剤の固化）され、円柱状の被鍛造部材１の全表面１ａ（周面及び前後端面）には潤滑皮膜が形成される。   Subsequently, the cylindrical forged member 1 lubricated by the lubrication processing unit is dried (solidified with a lubricant) by applying hot air when passing through the drying processing unit, and the cylindrical forged member 1 A lubricating film is formed on the entire surface 1a (circumferential surface and front and rear end surfaces).

この乾燥処理部で乾燥処理された円柱状の被鍛造部材１は導出部で表面処理装置10の外部へ導出されることになる。この導出された円柱状の被鍛造部材１の全表面１ａ（周面及び前後端面）には潤滑皮膜が良好に定着している。   The cylindrical to-be-forged member 1 subjected to the drying process by the drying processing unit is led out of the surface treatment apparatus 10 by the lead-out unit. The lubricant film is satisfactorily fixed on the entire surface 1a (circumferential surface and front and rear end surfaces) of the derived cylindrical forged member 1.

ところで、本実施例では、後述する素材及びサイズの被鍛造部材１の表面１ａには無数（約７４，０００個）に凹所５（角錐形状の凹部）が形成され、この凹所５は、深さ０．５μｍ〜２．００μｍ，開口巾７５μｍ〜１５０μｍ，面積０．００６〜００２３ｍｍ２であり、被鍛造部材１として極めて秀れることになる。 By the way, in the present embodiment, innumerable (about 74,000) recesses 5 (pyramidal recesses) are formed on the surface 1a of the to-be-forged member 1 of the material and size described later. The depth is 0.5 μm to 2.00 μm, the opening width is 75 μm to 150 μm, and the area is 0.006 to 0023 mm 2 .

これは、以下の試験により確認している。   This has been confirmed by the following test.

即ち、先ずは、砥粒Ａ（５０μｍステンレス砥粒），砥粒Ｂ（１５０μｍステンレス砥粒），砥粒Ｃ（２１０μｍステンレス砥粒），砥粒Ｄ（３２０μｍステンレス砥粒），砥粒Ｅ（２５０μｍアルミナ砥粒）及び砥粒Ｆ（３００μｍスチール砥粒）を用意し、これら砥粒Ａ〜Ｅを前述した表面処理装置10で被鍛造部材１（クロムモリブデン鋼／ＳＣＭ４２０径１９．９ｍｍ／長さ２０ｍｍ／表面積約１，０３０ｍｍ２）の処理を行い（砥粒Ｆはショットブラストを行い）、この得られた被鍛造部材１を前方軸／後方缶押出し試験装置20を利用して前方押出し量及び後方押出し量を測定した（図４，５参照）。 That is, first, abrasive grain A (50 μm stainless steel abrasive grain), abrasive grain B (150 μm stainless steel abrasive grain), abrasive grain C (210 μm stainless steel abrasive grain), abrasive grain D (320 μm stainless steel abrasive grain), abrasive grain E (250 μm) Alumina abrasive grains) and abrasive grains F (300 μm steel abrasive grains) are prepared, and these abrasive grains A to E are subjected to the forged member 1 (chromium molybdenum steel / SCM420 diameter 19.9 mm / length 20 mm) by the surface treatment apparatus 10 described above. / Surface area of about 1,030 mm 2 ) (the abrasive grains F are shot blasted), and the forged member 1 thus obtained is subjected to a front extrusion amount and a rear direction using a front shaft / rear can extrusion test apparatus 20. The extrusion amount was measured (see FIGS. 4 and 5).

図７は、砥粒Ａ〜Ｆと前方押出し量との関係を示し、図８は、砥粒Ａ〜Ｆと後方押出し量との関係を示している。   FIG. 7 shows the relationship between the abrasive grains A to F and the forward extrusion amount, and FIG. 8 shows the relationship between the abrasive grains A to F and the backward extrusion amount.

前方軸／後方缶押出しにおいてパンチストロークを一定とした時、前方押出し量が多く且つ後方押出し量が少ないほど表面の摩擦抵抗が少ないことになるが、前方押出し量及び後方押出し量ともに最良であり、表面の摩擦抵抗が少ないのは順に砥粒Ｂ、砥粒Ｃ、砥粒Ｄ、砥粒Ｅ、砥粒Ｆ、砥粒Ａの順になった。   When the punch stroke is constant in the front shaft / rear can extrusion, the more the front extrusion amount and the smaller the rear extrusion amount, the smaller the frictional resistance of the surface, but both the front extrusion amount and the rear extrusion amount are the best. The surface with the smallest frictional resistance was in the order of abrasive grains B, abrasive grains C, abrasive grains D, abrasive grains E, abrasive grains F, and abrasive grains A.

即ち、砥粒Ｂで処理された被鍛造部材１は、他の砥粒で処理された被鍛造部材１に比し、前方への伸びが多く且つ後方への伸びが少なく、よって、砥粒Ｂで処理された被鍛造部材１の表面１ａにおける摩擦抵抗が少ないことが分かった。この結果により、使用する砥粒によって成型負荷に大きく影響することが明確になった。   That is, the to-be-forged member 1 treated with the abrasive grains B has more forward elongation and less backward elongation than the forged member 1 treated with other abrasive grains. It was found that the frictional resistance on the surface 1a of the to-be-forged member 1 processed in step 1 was small. From this result, it became clear that the abrasive load used has a great influence on the molding load.

また、図９は、冷間鍛造成型時の最大荷重と前方押出し量との関係を示している。   FIG. 9 shows the relationship between the maximum load at the time of cold forging and the amount of forward extrusion.

前述した砥粒Ｂで処理された被鍛造部材１は、その他の砥粒で処理された被鍛造部材１に比し、冷間鍛造成型時の最大荷重が小さい。   The to-be-forged member 1 treated with the abrasive grain B described above has a smaller maximum load during cold forging molding than the forged member 1 treated with other abrasive grains.

即ち、前方押出し量が多い結果を生じる表面１ａを備えた被鍛造部材１は、冷間鍛造成型時の最大荷重が小さく、この冷間鍛造成型時の最大荷重と押出し量とはほぼ反比例となるセオリー通りの結果となった。   That is, the to-be-forged member 1 provided with the surface 1a that produces a result of a large amount of forward extrusion has a small maximum load at the time of cold forging, and the maximum load at the time of cold forging and the amount of extrusion are almost inversely proportional. The result of Theory Street.

また、図10は、砥粒Ａ〜Ｆを用いて被鍛造部材１の表面処理を行い、この被鍛造部材１の端面に生じた凹所５の深さ（Ｈ）と前方押出し量との関係、図11は、砥粒Ａ〜Ｆを利用して被鍛造部材１の表面処理を行い、この被鍛造部材１の端面に生じた凹所５の開口巾（Ｗ）と前方押出し量との関係を示している。   Further, FIG. 10 shows the relationship between the depth (H) of the recess 5 formed on the end face of the forged member 1 and the forward extrusion amount by performing surface treatment of the forged member 1 using the abrasive grains A to F. FIG. 11 shows the relationship between the opening width (W) of the recess 5 formed on the end face of the forged member 1 and the forward extrusion amount by performing surface treatment of the forged member 1 using the abrasive grains A to F. Is shown.

図10から分かるように、砥粒Ｂで処理して生じる凹所５の深さは、エアー圧が０．２ＭＰａだと０．５μｍ、エアー圧が０．４ＭＰａだと１．５μｍであり、また、図11から分かるように、砥粒Ｂで処理して生じる凹所５の開口巾は、エアー圧が０．２ＭＰａだと１５０μｍ、エアー圧が０．４ＭＰａだと１４０μｍである。   As can be seen from FIG. 10, the depth of the recess 5 produced by the treatment with the abrasive grains B is 0.5 μm when the air pressure is 0.2 MPa, 1.5 μm when the air pressure is 0.4 MPa, As can be seen from FIG. 11, the opening width of the recess 5 produced by the treatment with the abrasive grains B is 150 μm when the air pressure is 0.2 MPa, and 140 μm when the air pressure is 0.4 MPa.

また、図12は、砥粒Ａ〜Ｆを用いて被鍛造部材１の表面処理を行い、この被鍛造部材１の側面に生じた凹所５の深さ（Ｈ）と前方押出し量との関係、図13は、砥粒Ａ〜Ｆを利用して被鍛造部材１の表面処理を行い、この被鍛造部材１の側面に生じた凹所５の開口巾（Ｗ）と前方押出し量との関係を示している。   FIG. 12 shows the relationship between the depth (H) of the recess 5 formed on the side surface of the forged member 1 and the forward extrusion amount by performing surface treatment of the forged member 1 using the abrasive grains A to F. FIG. 13 shows the relationship between the opening width (W) of the recess 5 formed on the side surface of the forged member 1 and the forward extrusion amount by performing surface treatment of the forged member 1 using the abrasive grains A to F. Is shown.

図12から分かるように、砥粒Ｂで処理して生じる凹所５の深さは、エアー圧が０．２ＭＰａだと０．５μｍ、エアー圧が０．４ＭＰａだと２．００μｍであり、また、図13から分かるように砥粒Ｂで処理して生じる凹所５の開口巾は、エアー圧が０．２ＭＰａだと７５μｍ、エアー圧が０．４ＭＰａだと１２５μｍである。   As can be seen from FIG. 12, the depth of the recess 5 produced by the treatment with the abrasive grains B is 0.5 μm when the air pressure is 0.2 MPa, 2.00 μm when the air pressure is 0.4 MPa, As can be seen from FIG. 13, the opening width of the recess 5 produced by the treatment with the abrasive grains B is 75 μm when the air pressure is 0.2 MPa, and 125 μm when the air pressure is 0.4 MPa.

以上の試験から、最適と判断された砥粒Ｂで処理した被鍛造部材１の表面１ａに生じる凹所５の深さは０．５μｍ〜２．００μｍ，開口巾は７５μｍ〜１５０μｍであり、この深さ０．５μｍ〜２．００μｍ，開口巾７５μｍ〜１５０μｍの凹所５を無数に備えた被鍛造部材１は潤滑処理を行った際の油切れが生じにくく、冷間鍛造する素材として極めて秀れたものとなることが確認できた。   From the above test, the depth of the recess 5 generated on the surface 1a of the forged member 1 treated with the abrasive grain B determined to be optimum is 0.5 μm to 2.00 μm, and the opening width is 75 μm to 150 μm. The to-be-forged member 1 provided with an infinite number of recesses 5 having a depth of 0.5 μm to 2.00 μm and an opening width of 75 μm to 150 μm is less likely to run out of oil when lubricated, and is extremely excellent as a material for cold forging. It was confirmed that

本実施例は上述のように構成したから、被鍛造部材１の表面に、液体２と砥粒３との混合物であるスラリ４を圧搾空気と混合して噴射して、被鍛造部材１の表面に深さ０．５μｍ〜２．００μｍ，開口巾７５μｍ〜１５０μｍの凹所５を無数に設ける。   Since the present embodiment is configured as described above, the slurry 4, which is a mixture of the liquid 2 and the abrasive grains 3, is mixed with the compressed air and sprayed onto the surface of the member 1 to be forged. An infinite number of recesses 5 having a depth of 0.5 μm to 2.00 μm and an opening width of 75 μm to 150 μm are provided.

この凹所５を無数に備えた被鍛造部材１は潤滑処理を行った際の油切れが生じにくく、鍛造する素材として極めて秀れたものとなる。   The to-be-forged member 1 provided with an infinite number of the recesses 5 is less likely to run out of oil when subjected to lubrication, and is extremely excellent as a material for forging.

また、本実施例は、被鍛造部材１はクロムモリブデン鋼であるから、前述した作用効果を確実に発揮し得ることになる。   Further, in this embodiment, the forged member 1 is made of chromium molybdenum steel, so that the above-described operational effects can be surely exhibited.

また、本実施例は、砥粒３として平均粒径が約１５０μｍのステンレス砥粒を採用したから、前述した作用効果を確実に発揮し得ることになる。   Moreover, since the present Example employ | adopted the stainless steel abrasive grain whose average particle diameter is about 150 micrometers as the abrasive grain 3, it can exhibit the effect mentioned above reliably.

尚、本発明は、本実施例に限られるものではなく、各構成要件の具体的構成は適宜設計し得るものである。   Note that the present invention is not limited to this embodiment, and the specific configuration of each component can be designed as appropriate.

１ 被鍛造部材
１ａ 表面
２ 液体
３ 砥粒
４ スラリ
５ 凹所 1 Forged member 1a Surface 2 Liquid 3 Abrasive grain 4 Slurry 5 Recess

ウエットブラスト処理部13は、図１に図示したように円柱状の被鍛造部材１を通過せしめる基体11に設けられ、スラリ噴射部14と、下方位置に配設されるスラリ貯留部15と、このスラリ貯留部15からポンプ装置16を介してスラリ噴射部14へスラリ４を搬送するスラリ搬送部17とを具備し、スラリ噴射部14から噴射されたスラリ４はスラリ貯留部15へ送られて再利用される構成である。 As shown in FIG. 1, the wet blast processing unit 13 is provided on the base 11 through which the column-shaped forged member 1 passes, and includes a slurry injection unit 14, a slurry storage unit 15 disposed at a lower position, A slurry transport unit 17 for transporting the slurry 4 from the slurry storage unit 15 to the slurry injection unit 14 via the pump device 16, and the slurry 4 injected from the slurry injection unit 14 is sent to the slurry storage unit 15 Configuration used.

ところで、本実施例では、後述する素材及びサイズの被鍛造部材１の表面１ａには無数（約７４，０００個）に凹所５（角錐形状の凹部）が形成され、この凹所５は、深さ０．５μｍ〜２．００μｍ，開口巾７５μｍ〜１５０μｍ，面積０．００６〜０．０２３ｍｍ２であり、被鍛造部材１として極めて秀れることになる。
By the way, in the present embodiment, innumerable (about 74,000) recesses 5 (pyramidal recesses) are formed on the surface 1a of the to-be-forged member 1 of the material and size described later. Depth 0.5 μm to 2.00 μm, opening width 75 μm to 150 μm, area 0.006 to 0 . It is 023 mm 2 and is extremely excellent as the forged member 1.

Claims (3)

被鍛造部材の表面処理方法であって、前記被鍛造部材の表面に、液体と砥粒との混合物であるスラリを圧搾空気と混合して噴射し、前記被鍛造部材の表面に深さ０．５μｍ〜２．００μｍ，開口巾７５μｍ〜１５０μｍの凹所を無数に設けることを特徴とする被鍛造部材の表面処理方法。   A surface treatment method for a forged member, wherein a slurry, which is a mixture of liquid and abrasive grains, is mixed with compressed air and sprayed on the surface of the forged member, and a depth of 0. 0 is formed on the surface of the forged member. A surface treatment method for a to-be-forged member, characterized by providing an infinite number of recesses having an opening width of 75 μm to 150 μm. 請求項１記載の被鍛造部材の表面処理方法において、前記被鍛造部材はクロムモリブデン鋼であることを特徴とする被鍛造部材の表面処理方法。   2. The surface treatment method for a forged member according to claim 1, wherein the forged member is chromium molybdenum steel. 請求項１，２いずれか１項に記載の被鍛造部材の表面処理方法において、前記砥粒として平均粒径が約１５０μｍのステンレス砥粒を採用したことを特徴とする被鍛造部材の表面処理方法。   The surface treatment method for a forged member according to claim 1, wherein stainless abrasive grains having an average particle diameter of about 150 μm are adopted as the abrasive grains. .
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